TWI860137B - Linear actuator with cushion mechanism - Google Patents

Abstract

A linear actuator with cushion mechanism includes an actuating body, a quick release mechanism and a buffer mechanism. The actuating body includes a motor, a lead screw, an outer tube and a telescopic tube. The lead screw is driven by the motor and rotates. The telescopic tube has a nut to screw drive with the lead screw. The quick release mechanism is in the lead screw and is used to release the drive of the motor and the lead screw. The buffer mechanism is configured in the actuating body and includes an elastomer and a deceleration structure. Wherein the quick release mechanism is released, the lead screw rotates under the load of the telescopic tube, compresses the elastomer through the nut and drives the deceleration structure to brake, thereby decelerating the rotating lead screw with the deceleration structure.

Description

Linear actuator with buffer mechanism

The present invention relates to the technical field of a linear actuator device, in particular to a linear actuator device with a buffer mechanism.

The linear actuator is installed in electric beds, treadmills or wheelchairs to adjust the angle of elevation or height. It is widely used and accepted by the public.

For example, US Patent Publication No. US5329657 discloses a hospital bed including an articulated support having a backrest portion movable between a horizontal position and a tilted position relative to the frame of the bed. The bed frame supports a reversible electric drive motor that can rotatably drive a threaded shaft through a reduction gear device and a detachable coupling mechanism. The nut is engaged with the shaft and is held so as not to rotate with the shaft, and a linkage connects the nut to the backrest portion to achieve reciprocating motion of the backrest portion in response to the reciprocating motion of the nut along the shaft. A manual release device is provided on the backrest portion and disengages from the releasable connection mechanism when actuated so that the threaded shaft can rotate freely independently of the motor and the gear device.

In addition, US Patent Publication No. US5346045 discloses a linear actuator having a reversible motor driving a threaded shaft engaged with a roller nut. A tubular housing connected to the nut has a base member and a load-securing lug at its distal end. A hydraulic shock absorber providing linear deceleration is typically maintained in its most relaxed state between the base member and the end of a spacer tube abutting the nut. When the nut is within the shock absorber travel distance at the driven end of the shaft, the free end of the shaft presses the shock absorber against the base. When the nut is within the shock absorber travel distance of the free end of the shaft, the ring engages with the stop ring, thereby maintaining the shock absorber body at a fixed distance from the free end of the shaft, and the spacer tube compresses the shock absorber. The eccentric brake is set on the drive coupling pulley and limits the rotation of the shaft beyond a predetermined rate.

In addition, US Patent Publication No. US2012240696A1 discloses a linear actuator with a reversible motor, which drives a non-self-locking spindle through a transmission device, through which a tubular positioning element can be axially moved because one end of it is connected to a spindle nut on the spindle. The actuator includes a transmission device for moving the tubular positioning element from the motor and a part from the motor to a quick release device so that the spindle is set to rotate through the load on the tubular positioning element. The actuator also includes a brake device, when the quick release device is activated, for controlling the speed of the tubular positioning element during external load. The brake device consists of a centrifugal brake, wherein the descent speed is self-controlled when the quick release device is activated.

One purpose of the present invention is to provide a linear actuator with a buffer mechanism, which decelerates the rotating lead screw through a deceleration structure, thereby reducing the impact force of the telescopic tube when it is retracted into the inner part of the outer tube.

In order to achieve the above-mentioned purpose, the present invention provides a linear actuator with a buffer mechanism, comprising an actuator body, a quick release mechanism and a buffer mechanism, wherein the actuator body comprises a motor, a lead screw, an outer tube and a telescopic tube, wherein the lead screw is driven by the motor to rotate, the outer tube is sleeved on the outside of the telescopic tube, and the telescopic tube has a nut and is used to be threadedly connected with the lead screw for transmission; the quick release mechanism is Mechanism It is arranged on the lead screw and is used to release the drive of the motor and the lead screw; the buffer mechanism is arranged on the actuating body and includes an elastic body and a deceleration structure; when the quick release mechanism is released, the lead screw rotates under the load of the telescopic tube, and the elastic body is compressed by the nut and the deceleration structure is driven to produce a brake, so that the deceleration structure can decelerate the rotating lead screw.

In order to achieve the above-mentioned purpose, the present invention provides another linear actuator with a buffer mechanism, comprising an actuator body, a quick release mechanism and a buffer mechanism, wherein the actuator body comprises a motor, a lead screw and a telescopic tube, wherein the lead screw is driven by the motor to rotate, and the telescopic tube has a nut and is threadedly connected with the lead screw for transmission; the quick release mechanism is disposed on the lead screw and is used to release the motor and the lead screw. The drive of the screw; the buffer mechanism is arranged on the actuating body and includes an elastic body and a deceleration structure, the deceleration structure includes a rotating wheel driven by the lead screw and a stop member arranged corresponding to the rotating wheel; wherein when the nut compresses the elastic body, the elastic body is deformed to drive the rotating wheel and the stop member to generate a mechanical connection, and the lead screw is decelerated by the stop member braking the rotating wheel.

In order to achieve the above-mentioned purpose, the present invention provides another linear actuator with a buffer mechanism, comprising an actuator body and a buffer mechanism, wherein the actuator body comprises a motor, a lead screw and a telescopic tube, wherein the lead screw is driven by the motor to rotate, and the telescopic tube has a nut and is threadedly connected with the lead screw for transmission; the buffer mechanism is disposed on the actuator body. The nut is a body and includes an elastic body and a deceleration structure, wherein the deceleration structure includes a rotating wheel driven by the lead screw and a stop member configured corresponding to the rotating wheel; wherein when the nut compresses the elastic body, the elastic body is deformed to actuate the rotating wheel and the stop member to generate a mechanical connection, and the lead screw is decelerated by the stop member braking the rotating wheel.

The present invention also has the following effects: by setting the reset member, it is convenient to disengage the rotating wheel and the stopper. By setting the cap, the impact force of the nut can be evenly transmitted to the elastic body. By setting the front positioning collar and the rear positioning collar, a stable holding effect is formed on the elastic body. By setting the first concave-convex surface and the second concave-convex surface of the rotating wheel and the stopper, the bite stability between the two can be improved. By matching the inner block of the rotating wheel and the U-shaped mouth of the guide member, the assembly procedure can be simplified and the ease of assembly can be improved. By setting the thrust bearing, the relative friction between the end face of the elastic body and the rotating wheel can be avoided, which can avoid the undesirable conditions such as scratches or abnormal noise. By arranging the offset wheel and the stopper in parallel, the ineffective stroke of the telescopic tube can be shortened.

10: Actuating the main body

11: Shell

111: Lower housing

112: Circular tube section

113: Half shell

115: Upper shell

13: Electric motor

131: snail

15: Transmission mechanism

151: Lead screw

1511: First positioning plane

152: External control

153: Telescopic tube

154:Front bearing

155:Rear bearing

156: worm wheel

157: Nut

30: Quick release mechanism

31: Positioning wheel

33: Clutch wheel

35: Guiding element

37: Pull assembly

50, 50D, 50E: Buffer mechanism

51: Elastic body

53, 53A, 53B, 53C, 53D, 53E: deceleration structure

531, 531A, 531B, 531C, 531D, 531E: Rotating wheel

5311:Guide groove

5313: convex key

5314: First friction surface

5315: The first magnet

5316:Card block

5317: First concave-convex surface

5319: Embedded block

533, 533A, 533B, 533C, 533D, 533E: anti-rotation parts

5331:Key slot

5333: Second magnet

5334: Second friction surface

5335: Second concave-convex surface

5336:Card slot

5337: First tooth

535: Braking element

536: offset wheel

5361: Second tooth

537, 537D, 537E: Guiding components

5371: Lower case

5373: Upper shell parts

5375:Guide bar

5377: Second positioning plane

5379: U-shaped mouth

539:Reset component

55: Cap

56:Front positioning ring

57:Thrust bearing

58: Rear positioning ring

60: Limiting piece

70: Rear support

75:Front support

Figure 1 is a perspective view of the first embodiment of the present invention.

Figure 2 is an appearance diagram of some components of the first embodiment of the present invention.

Figure 3 is a partial component exploded view of the first embodiment of the present invention.

Figure 4 is a cross-sectional view of the first embodiment of the present invention.

Figure 5 is a cross-sectional view of the first embodiment of the present invention in use.

Figure 6 is an appearance diagram of some components of the second embodiment of the present invention.

Figure 7 is a cross-sectional view of the second embodiment of the present invention.

Figure 8 is a cross-sectional view of the second embodiment of the present invention in use.

Figure 9 is a cross-sectional view of the third embodiment of the present invention.

Figure 10 is a cross-sectional view of the third embodiment of the present invention in use.

Figure 11 is a cross-sectional view of the fourth embodiment of the present invention.

Figure 12 is a perspective view of the fifth embodiment of the present invention.

Figure 13 is an appearance diagram of some components of the fifth embodiment of the present invention.

Figure 14 is a partial component exploded view of the fifth embodiment of the present invention.

Figure 15 is a cross-sectional view of the fifth embodiment of the present invention.

Figure 16 is a cross-sectional view of the fifth embodiment of the present invention in use.

Figure 17 is a perspective view of the sixth embodiment of the present invention.

Figure 18 is an appearance diagram of some components of the sixth embodiment of the present invention.

Figure 19 is a partial component exploded view of the sixth embodiment of the present invention.

Figure 20 is a cross-sectional view of the sixth embodiment of the present invention.

Figure 21 is a cross-sectional view of the sixth embodiment of the present invention in use.

The detailed description and technical contents of the present invention are described below with accompanying drawings. However, the attached drawings are only for reference and explanation and are not used to limit the present invention.

Please refer to Figures 1 to 5. The present invention provides a linear actuator with a buffer mechanism. This linear actuator is mainly used on a nursing bed or a medical bed (not shown). Through the operation of the linear actuator, the front section of the nursing bed or the medical bed can be raised or swung horizontally. Especially when the patient must lie flat to perform electric shocks during the first aid process, the linear actuator can reduce the impact of the front section of the nursing bed or the medical bed when it is rapidly descending, thereby reducing the damage to the patient and improving the user's comfort.

The aforementioned linear actuation device mainly includes an actuation body 10, a quick release mechanism 30 and a buffer mechanism 50.

Please refer to FIG. 1 . The actuator body 10 mainly includes a housing 11, a motor 13 and a transmission mechanism 15. The housing 11 mainly includes a lower housing 111 and an upper housing 115. The upper housing 115 and the lower housing 111 can be made of plastic or other materials. The lower housing 111 is made of a round tube section 112 and a cylindrical tube section 113. The upper shell 115 is formed by a half shell 113 extending from one end of the circular tube section 112, and the end of the circular tube section 112 away from the half shell 113 is closed; the upper shell 115 is also a half shell, which is correspondingly covered with the half shell 113 of the lower shell 111, and the lower shell 111 and the upper shell 115 can be connected by screws and other screw-fastening elements.

The motor 13 is installed inside the circular tube section 112 of the lower shell 111 and has a worm 131. The motor 13 can make the worm 131 rotate in the positive and negative directions through the combination and operation of the internal magnetic poles, coils, current and other related components.

Please refer to FIG. 2, FIG. 4 and FIG. 5 together. The transmission mechanism 15 mainly includes a lead screw 151, an outer tube 152 and a telescopic tube 153. The lead screw 151 is sleeved with a front bearing 154 and a rear bearing 155, so that the rear section of the lead screw 151 is supported inside the lower housing 111 (see FIG. 4 and FIG. 5), and the remaining part of the lead screw 151 extends out of the housing 11; the lead screw 151 behind the front bearing 154 is 1 is sleeved with a worm wheel 156 corresponding to the aforementioned worm 131 and engaging with each other, wherein the lead screw 151 of this embodiment is a non-self-locking lead screw, that is: when the telescopic tube 153 is constrained or restricted and cannot rotate, the telescopic tube 153 is subjected to axial thrust or pressure, which will enable the lead screw 151 to rotate freely relative to the telescopic tube 153, so that the telescopic tube 153 can produce linear displacement and retract into the interior of the outer tube 152.

The outer tube 152 is a hollow body, which is sleeved along the outer periphery of the lead screw 151 and is used to provide support for the telescopic tube 153. One end of the outer tube 152 is covered and fixed by the lower shell 111 and the upper shell 115.

The telescopic tube 153 is sleeved on the outer periphery of the lead screw 151 and formed inside the outer tube 152. One end of the telescopic tube 153 is connected to a nut 157, and the nut 157 and the lead screw 151 are mutually threadedly connected for transmission. The outer periphery of the nut 157 is provided with a groove and a block (not shown) that interlock with the outer tube 152, so that the nut 157 and the telescopic tube 153 can only move linearly inside the outer tube 152, but cannot make rotational motion.

As shown in FIG. 4 and FIG. 5 , the quick release mechanism 30 mainly includes a positioning wheel 31, a clutch wheel 33 and a guide element 35. The positioning wheel 31, the clutch wheel 33 and the guide element 35 are generally a cylindrical body, wherein the positioning wheel 31 is sleeved on the lead screw 151 and fixed so that the positioning wheel 31 can rotate along with the lead screw 151. The clutch wheel 33 is sleeved on the lead screw 151 through the guide element 35 and is formed on one side of the positioning wheel 31. The clutch wheel 33 can move axially thereon by means of the guiding effect of the guide element 35. A plurality of key slots (not shown) are provided on one side of the clutch wheel 33, and a plurality of cams (not shown) are provided on the outer periphery of the positioning wheel 31; similarly, each cam and each key slot can be interchangeably provided between the positioning wheel and the clutch wheel. Each cam can be embedded in each key slot so that the clutch wheel 33 can be operatively engaged or disengaged with the positioning wheel 31.

Please refer to FIG. 1 again. The quick release mechanism 30 of this embodiment further includes a pull assembly 37, which is pivoted to the outside of the upper housing 115 (as shown in FIG. 1 ), and is connected to the aforementioned clutch wheel 33 through a connecting member (not shown) disposed inside the upper housing 115, so that the clutch wheel 33 can slide on the guide element 35 by operating the pull assembly 37, and can engage or disengage with the positioning wheel 31 accordingly.

The lead screw 151 is driven by the engagement of the worm 131 of the motor 13 and the worm wheel 156. When the clutch wheel 33 and the positioning wheel 31 are engaged, the lead screw 151 is driven by the positioning wheel 31, the clutch wheel 33 and the guide element 35 to rotate; when the clutch wheel 33 and the positioning wheel 31 are disengaged, the lead screw 151 is freely rotated together with the positioning wheel 31 under the load of the telescopic tube 153, and the clutch wheel 33, the guide element 35 and the worm wheel 156 are restrained by the worm 131 and do not rotate.

Please refer to FIG. 3 , the buffer mechanism 50 is disposed on the lead screw 151. The buffer mechanism 50 of this embodiment is located between the nut 157 and the cogwheel 156. The buffer mechanism 50 mainly includes an elastic body 51 and a deceleration structure 53. The elastic body 51 of this embodiment is a compression spring. The deceleration structure 53 of this embodiment mainly includes a rotating wheel 531, a stopper 533 and a braking element 535. The stopper 533 and the braking element 535 together constitute the stop member of this embodiment. The shapes of the rotating wheel 531 and the stopper 533 of this embodiment are generally cylindrical, but not limited to this shape; the rotating wheel 531 is arranged adjacent to the nut 157, and the stopper 533 is arranged on a side of the rotating wheel 531 away from the nut 157. The braking element 535 is sleeved on the outer periphery of the stopper 533. The braking element 535 of this embodiment is a spring, but not limited to this type. One end of the spring is fixed to the housing 11 of the actuator body 10.

In one embodiment, the end surface of the rotating wheel 531 facing the stopper 533 is provided with a plurality of cams 5313, and the end surface of the stopper 533 facing the rotating wheel 531 is provided with a plurality of key slots 5331, each key slot 5331 is configured corresponding to each cam 5313, and can be operatively engaged or disengaged. Similarly, each cam 5313 and each key slot 5331 can also be interchangeably arranged between the stopper 533 and the rotating wheel 531. The number of the aforementioned cam 5313 and key slot 5331 can be one.

The deceleration structure 53 of this embodiment further includes a guide component 537 , which is sleeved on the lead screw 151 and rotates along with the lead screw 151 . The rotating wheel 531 and the stopper 533 are sleeved on the guide component 537 . The guide component 537 mainly includes a lower shell 5371 and an upper shell 5373. The upper shell 5373 corresponds to the lower shell 5371 and is sleeved on the lead screw 151. A first positioning plane 1511 is provided on the circumference of the lead screw 151, and a second positioning plane 5377 is provided inside the upper shell 5373 and the lower shell 5371. The first positioning plane 1511 and the second positioning plane 5377 are mutually engaged and positioned, so that the guide component 537 can rotate with the lead screw 151.

In addition, a plurality of guide strips 5375 extend from the circumference of the guide member 537, and a plurality of guide grooves 5311 are provided on the inner wall of the rotating wheel 531. Each guide strip 5375 is engaged with each guide groove 5311. Each guide strip 5375 of the guide member 537 is engaged with each guide groove 5311, so that the guide member 537 can drive the rotating wheel 531 to follow the rotation, and the stopper 533 is sleeved on the area of the guide member 537 that does not have the guide strip 5375. Therefore, when the rotating wheel 531 is not actuated by the elastic body 51, the stopper 533 and the rotating wheel 531 are not mechanically connected. At this time, the stopper 533 is restrained by the braking element 535 and does not rotate with the guide screw 151 and the guide member 537. Only after the rotating wheel 531 is pushed by the elastic body 51, the rotating wheel 531 and the stopper 533 are forced to be mechanically connected (the so-called "mechanical connection" refers to the embedding and connection of the aforementioned convex keys 5313 corresponding to the respective key slots 5331; similarly, it can also be a connection generated by friction or other means), and the stopper 533 is restrained by the braking element 535, so that the rotating wheel 531 is stopped from rotating. The number of the aforementioned guide groove 5311 and guide strip 5375 can also be one.

The deceleration structure 53 of this embodiment also includes a reset member 539, which is disposed between the rotating wheel 531 and the stop member 533, so that when the rotating wheel 531 is not pushed by the elastic body 51, the rotating wheel 531 can be pushed away to disengage the rotating wheel 531 and the stop member 533. Similarly, the reset member 539 can also be disposed inside or outside the rotating wheel 531 or the stop member 533.

The buffer mechanism 50 of this embodiment also includes a cap 55, which is sleeved on the end of the elastic body 51 away from the deceleration structure 53, so that when the nut 157 directly hits the elastic body 51, the impact force is evenly transmitted to the elastic body 51 through the cap 55.

The buffer mechanism 50 of this embodiment also includes a thrust bearing 57, which is sleeved on the outer periphery of the rotating wheel 531. Since the rotating wheel 531 rotates following the lead screw 151, the setting of the thrust bearing 57 can prevent the elastic body 51 from rotating. After the elastic body 51 is squeezed and deformed by the nut 157, the setting of the thrust bearing 57 can avoid the relative friction between the end surface of the elastic body 51 and the rotating wheel 531, which can cause scratches or abnormal noises. Similarly, the aforementioned thrust bearing 57 can also be replaced by a gasket.

In one embodiment, at least one limiting member 60 is also included, which is passed through and fixed to the outer tube 152 and is used to limit the movement of the cap 55 and/or the elastic body 51.

The linear actuator with a buffer mechanism of the present invention also includes a rear support 70 and a front support 75. The rear support 70 is sleeved on the rear side of the rear bearing 155 and is clamped and fixed by the upper shell 115 and the lower shell 111. The front support 75 is sleeved on the end of the telescopic tube 153 away from the nut 157.

When in use, the clutch wheel 33 and the positioning wheel 31 are disengaged by operating the pull assembly 37, and the patient's own weight or medical staff applies pressure to the front section of the nursing bed or medical bed. The telescopic tube 153, under the aforementioned load, drives the lead screw 151 to rotate by the nut 157, and the telescopic tube 153 is retracted into the inner part of the outer tube 152. At the end of the movement stroke of the telescopic tube 153, the nut 157 pushes the cap 55 and the elastic body 51 to compress and deform the elastic body 51; then, the elastic body 51 is deformed. The compression force generated after the deformation pushes the rotating wheel 531 to move toward the stopper 533. At this time, the convex keys 5313 of the rotating wheel 531 will be embedded in the key slots 5331 of the stopper 533, so that the rotating wheel 531 drives the stopper 533 to rotate together. The stopper 533 can be tightened and restricted by the braking element 535, so that the rotation of the rotating wheel 531 and the lead screw 151 can be stopped by the stopper 533, thereby reducing the rotation speed of the lead screw 151 and slowing down the movement speed of the telescopic tube 153 retracting into the outer tube 152.

Please refer to Figures 6 to 8. The linear actuator with a buffer mechanism in this embodiment is roughly the same as the structure of the first embodiment. The difference is that the deceleration structure 53A in this embodiment mainly includes a rotating wheel 531A, a stopper 533A and a braking element 535, wherein the end surface of the rotating wheel 531A facing the stopper 533A is provided with a first friction surface 5314, and the end surface of the stopper 533A facing the rotating wheel 531A is provided with a second friction surface 5334, and the rotation is driven by the friction between the first friction surface 5314 and the second friction surface 5334.

Please refer to FIG. 9 and FIG. 10 . The difference between the linear actuator with a buffer mechanism of this embodiment and the above-mentioned embodiments is that the deceleration structure 53B of this embodiment mainly includes a rotating wheel 531B, a stopper 533B and a braking element 535, wherein a first magnet 5315 is provided on the rotating wheel 531B, and a second magnet 5333 is provided on the stopper 533B, wherein the first magnet 5315 and the second magnet 5333 together constitute the reset component of this embodiment. The rotating wheel 531B and the stopper 533B are also driven to rotate by the friction of their end faces; the first magnet 5315 and the second magnet 5333 use the repulsion of like poles to enable the rotating wheel 531B to be separated from the mechanical connection with the stopper 533B when it is not pushed by the elastic body 51. In one embodiment, the corresponding end faces of the rotating wheel 531B and the stopper 533B can also be driven to rotate by a concave-convex structure or a combination of a key and a groove.

Please refer to FIG. 11 . The difference between the linear actuator with a buffer mechanism of this embodiment and the aforementioned embodiments is that the deceleration structure 53C of this embodiment mainly includes a rotating wheel 531C and a stopper 533C, wherein the stopper 533C constitutes the stopping member of this embodiment. One end of the elastic body 51 is tightened and fixed to the outer periphery of the stopper 533C, and a positioning plane (not shown) is provided inside the rotating wheel 531C to fit with the plane of the lead screw 151, so that the rotating wheel 531C is driven by the lead screw 151 to rotate together, and the compression force generated by the deformation of the elastic body 51 pushes the stopper 533C and the rotating wheel 531C to be mechanically connected, and the friction braking effect is generated between the end faces of the rotating wheel 531C and the stopper 533C, so that the rotating lead screw 151 reduces the rotation speed or stops rotating.

Please refer to Figures 12 to 16. The difference between the linear actuator with a buffer mechanism of this embodiment and the first embodiment is that the deceleration structure 53D of this embodiment mainly includes a rotating wheel 531D, a stopper 533D and a braking element 535, wherein a first concave-convex surface 5317 is provided on the end surface of the rotating wheel 531D facing the stopper 533D, and a second concave-convex surface 5335 is provided on the end surface of the stopper 533D facing the rotating wheel 531D. The first concave-convex surface 5317 and the second concave-convex surface 5335 can be operatively engaged or disengaged, thereby enhancing the engagement stability between the two.

A U-shaped opening 5379 is provided in the guide member 537D, which is sleeved corresponding to the first positioning plane 1511 of the lead screw 151, so that the guide member 537D can rotate with the lead screw 151. In addition, an embedded block 5319 is provided inside the rotating wheel 531D, which is movably connected to the aforementioned U-shaped opening 5379, so that the rotating wheel 531D can move axially relative to the guide member 537D and can rotate with it. The stopper 533D is sleeved on the guide member 537D. When the rotating wheel 531D and the stopper 533D are not mechanically connected, the stopper 533D does not rotate, which can simplify the assembly process and improve the ease of assembly.

The buffer mechanism 50D of this embodiment also includes a front positioning ring 56 and a rear positioning ring 58. The front positioning ring 56 and the rear positioning ring 58 are respectively sleeved on the two ends of the elastic body 51 to form a stable holding effect on the elastic body 51.

This embodiment also includes a plurality of limit members 60, each of which is penetrated and fixed on the outer tube 152 to limit the movement of the front positioning ring 56. The number of the limit members 60 can be one.

Please refer to FIG. 17 to FIG. 21 , the difference between this embodiment and the aforementioned fifth embodiment is that the deceleration structure 53E of this embodiment mainly includes a rotating wheel 531E, a stopper 533E, a braking element 535 and a deflection wheel 536, wherein the stopper 533E, the braking element 535 and the deflection wheel 536 together constitute the stopper component of this embodiment. The rotating wheel 531E is also connected to the lead screw 151 through a guide component 537E and rotates with it, and the stopper 533E is sleeved on the guide component 537E. When the rotating wheel 531E and the stopper 533E are not mechanically connected, the stopper 533E does not rotate. The offset wheel 536 is pivoted on the housing 11 of the actuator body 10 and connected to the anti-rotation member 533E. The braking element 535 is sleeved on the offset wheel 536 and one end of the braking element 535 is fixed in the housing 11 of the actuator body 10; in this way, the ineffective stroke of the telescopic tube 153 can be shortened.

In one embodiment, the deceleration structure 53E further includes a reset member 539, which is disposed between the rotating wheel 531E and the stop member 533E, so as to push the rotating wheel 531E away when the rotating wheel 531E is not pushed by the elastic body 51, so that the rotating wheel 531E and the stop member 533E are disengaged.

In one embodiment, a slot 5336 is provided on the end surface of the rotating wheel 531E facing the stopper 533E, and a block 5316 is provided on the end surface of the stopper 533E facing the rotating wheel 531E. The block 5316 and the slot 5336 can be operatively engaged or disengaged. A plurality of first protrusions 5337 extend from the circumference of the stopper 533E, and a plurality of second protrusions 5361 extend from the circumference of the offset wheel 536. The first protrusions 5337 and the second protrusions 5361 are engaged to drive the rotation.

The above is only a preferred embodiment of the present invention and is not intended to limit the patent scope of the present invention. Other equivalent variations that apply the patent spirit of the present invention should all fall within the patent scope of the present invention.

10: Actuating the main body

11: Shell

111: Lower housing

112: Circular tube section

113: Half shell

115: Upper shell

13: Electric motor

131: snail

15: Transmission mechanism

151: Lead screw

152: External control

153: Telescopic tube

157: Nut

37: Pull assembly

50: Buffer mechanism

60: Limiting piece

70: Rear support

75:Front support

Claims (25)

A linear actuator with a buffer mechanism, comprising: an actuator body, comprising a motor, a lead screw, an outer tube and a telescopic tube, wherein the lead screw is driven by the motor to rotate, the outer tube is sleeved on the outside of the telescopic tube, and the telescopic tube has a nut and is used to be threadedly connected with the lead screw for transmission; a quick release mechanism, which is provided on the lead screw and is used to release the drive of the motor and the lead screw; and a buffer mechanism, which is arranged on the actuator body and comprises an elastic body and a deceleration structure; When the quick release mechanism is released, the lead screw rotates under the load of the telescopic tube, compresses the elastic body through the nut and drives the deceleration structure to produce a brake, so that the deceleration structure can decelerate the rotating lead screw. A linear actuator with a buffer mechanism as described in claim 1, wherein the deceleration structure includes a rotating wheel and a stopper configured corresponding to the rotating wheel, the rotating wheel is arranged on the lead screw and follows its rotation, and the stopper is arranged on the lead screw and brakes the rotating wheel through a mechanical connection with the rotating wheel. A linear actuating device with a buffer mechanism as described in claim 2, wherein the deceleration structure further includes a braking element, which is arranged on the stop member. A linear actuating device with a buffer mechanism as described in claim 3, wherein the braking element is a spring, one end of which is fixed to the actuating body. A linear actuating device with a buffer mechanism as described in claim 2, wherein the rotating wheel is provided with at least one cam, and the stop member is provided with at least one key-receiving groove capable of engaging with or disengaging from the cam. A linear actuator with a buffer mechanism as described in claim 2, wherein the deceleration structure further includes a guide component, the rotating wheel is connected to the lead screw through the guide component, the guide component is provided with at least one guide strip, the rotating wheel is provided with at least one guide groove that can correspond to the guide strip, and the stop member is provided on the guide component. A linear actuator with a buffer mechanism as described in claim 6, wherein the guide component includes a lower shell and an upper shell, the upper shell corresponds to the lower shell cover and is sleeved on the lead screw, the lead screw is provided with a first positioning plane, and the upper shell and the lower shell are respectively provided with a second positioning plane that can be engaged and positioned with the first positioning plane. A linear actuating device with a buffer mechanism as described in claim 2, wherein the deceleration structure further includes a reset member, which is arranged between the rotating wheel, the stop member and one of the rotating wheel and the stop member. A linear actuator with a buffer mechanism as described in claim 8, wherein the reset member is a spring or a magnet. A linear actuator with a buffer mechanism as described in claim 2, wherein the buffer mechanism also includes a thrust bearing disposed on the rotating wheel. A linear actuator with a buffer mechanism as described in claim 2, wherein the rotating wheel is provided with a first friction surface, and the stop member is provided with a second friction surface that can be driven to rotate by the first friction surface. A linear actuator with a buffer mechanism as described in claim 2, wherein the rotating wheel is provided with a first concave-convex surface, and the stop member is provided with a second concave-convex surface capable of engaging with or disengaging from the first concave-convex surface. A linear actuator with a buffer mechanism as described in claim 12, wherein the deceleration structure further includes a guide component, the rotating wheel is connected to the lead screw through the guide component, the guide component is provided with a U-shaped opening, the rotating wheel is provided with an embedded block movably connected to the U-shaped opening, and the stop member is provided on the guide component. A linear actuator with a buffer mechanism as described in claim 12, wherein the buffer mechanism further includes a front positioning ring and a rear positioning ring, and the front positioning ring and the rear positioning ring are respectively arranged at two ends of the elastic body. The linear actuator with a buffer mechanism as described in claim 14 further includes at least one limiter for limiting the stroke of the front positioning ring, and the limiter is fixed to the outer tube. The linear actuator with a buffer mechanism as described in claim 1 further includes at least one limiter for limiting the travel of the elastic body. The buffer mechanism also includes a cap, which is arranged at one end of the elastic body away from the deceleration structure, and the limiter is fixed to the outer tube. A linear actuating device with a buffer mechanism as described in claim 2, wherein the deceleration structure produces braking by tightening and fixing the anti-rotation member through the elastic body. A linear actuating device with a buffer mechanism as described in claim 2, wherein the deceleration structure further includes a braking element and an offset wheel, the offset wheel is pivotally mounted on the actuating body and connected to the anti-rotation member, the braking element is sleeved on the offset wheel and one end of the braking element is fixed to the actuating body. A linear actuating device with a buffer mechanism as described in claim 18, wherein the deceleration structure further includes a reset member disposed between the rotating wheel and the stop member. A linear actuating device with a buffer mechanism as described in claim 18, wherein the rotating wheel is provided with a block, the anti-rotation member is provided with a slot and a plurality of first cams, the offset wheel is provided with a plurality of second cams capable of engaging and rotating with each of the first cams, and the block can engage or disengage corresponding to the slot. A linear actuator with a buffer mechanism, comprising: an actuator body, comprising a motor, a lead screw and a telescopic tube, wherein the lead screw is driven by the motor to rotate, and the telescopic tube has a nut and is used to be threadedly connected with the lead screw for transmission; a quick release mechanism, which is provided on the lead screw and is used to release the drive of the motor and the lead screw; and a buffer mechanism, which is arranged on the actuator body and comprises an elastic body and a deceleration structure, wherein the deceleration structure comprises a rotating wheel driven by the lead screw and a stop member arranged corresponding to the rotating wheel; When the nut compresses the elastic body, the elastic body is deformed to actuate the rotating wheel and the stop member to generate a mechanical connection, and the stop member brakes the rotating wheel to decelerate the lead screw. A linear actuating device with a buffer mechanism as described in claim 21, wherein the stop member includes a stopper and a braking element, the braking element is arranged on the stopper, the stopper is configured corresponding to the rotating wheel and can be operatively engaged or disengaged. A linear actuating device with a buffer mechanism as described in claim 21, wherein the stop member includes a stop member, one end of which is fixed to the elastic body, and the other end of which corresponds to the configuration of the rotating wheel and can be operatively engaged or disengaged. A linear actuating device with a buffer mechanism as described in claim 21, wherein the stopping member includes a stopper, a braking element and an offset wheel, the stopper is configured corresponding to the rotating wheel and can be operably engaged or disengaged, the braking element is arranged on the offset wheel, and the offset wheel is pivoted to the actuating body and connected to the stopper. A linear actuator with a buffer mechanism comprises: an actuator body, comprising a motor, a lead screw and a telescopic tube, wherein the lead screw is driven by the motor to rotate, and the telescopic tube has a nut and is threadedly connected with the lead screw for transmission; and a buffer mechanism, which is arranged on the actuator body and comprises an elastic body and a deceleration structure, wherein the deceleration structure comprises a rotating wheel driven by the lead screw and a stop member arranged corresponding to the rotating wheel; wherein when the nut compresses the elastic body, the elastic body is deformed to drive the rotating wheel and the stop member to generate a mechanical connection, and the lead screw is decelerated by the stop member braking the rotating wheel.