CN110668361B - A labor-saving parking brake mechanism - Google Patents
A labor-saving parking brake mechanism Download PDFInfo
- Publication number
- CN110668361B CN110668361B CN201910984731.7A CN201910984731A CN110668361B CN 110668361 B CN110668361 B CN 110668361B CN 201910984731 A CN201910984731 A CN 201910984731A CN 110668361 B CN110668361 B CN 110668361B
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- cable
- operating handle
- parking brake
- brake mechanism
- mounting shaft
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- 230000007246 mechanism Effects 0.000 title claims abstract description 27
- 238000009434 installation Methods 0.000 abstract description 13
- 230000033001 locomotion Effects 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 10
- 230000008859 change Effects 0.000 description 8
- 230000009471 action Effects 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/07509—Braking
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Braking Elements And Transmission Devices (AREA)
- Braking Arrangements (AREA)
Abstract
The invention discloses a labor-saving parking brake mechanism which comprises fixed guide brackets symmetrically arranged on a vehicle body, wherein the front side edge of each fixed guide bracket is an arc-shaped slideway, each fixed guide bracket is rotatably connected with a mounting shaft, each mounting shaft is fixedly connected with an operating handle for driving the corresponding mounting shaft to rotate, a cable supporting frame is fixedly connected below each mounting shaft, a cable assembly is arranged at the contact position of each cable supporting frame and each arc-shaped slideway in a leaning manner, and each cable assembly slides along each arc-shaped slideway under the driving of each cable supporting frame. The parking brake mechanism provided by the invention has the advantages that the front half angle of rotation is pulled upwards at the operating handle, so that the travel of the inhaul cable is about four fifths of the total travel, and the lever ratio is rapidly increased at the rear half angle of rotation by pulling upwards at the operating handle, thereby achieving the effect of alleviating the operating force. The invention has simple structure and convenient installation, reduces the operating force by reasonably designing the movement path of the inhaul cable, and greatly improves the operation comfort.
Description
Technical Field
The invention belongs to the technical field of forklifts, and particularly relates to a labor-saving parking brake mechanism.
Background
The parking brake mechanism of the forklift consists of an operating handle, a fixed bracket, a guy rope, a brake switch and the like, and has the function of ensuring that the forklift is parked reliably on a flat ground or a ramp under the electroless state, and can also be used for emergency braking. Foot-type brakes are commonly adopted for parking braking of domestic forklifts. The mode needs to be provided with a cam type brake operating handle, a driver moves the brake operating handle after parking, a brake pull rod is pulled through a flexible shaft embedded in the operating handle, and the action of the pull rod is transmitted to a brake shoe through a push rod to achieve the purpose of braking, or in wet braking, the friction disc is pressed by the mechanical push rod to achieve braking. With the improvement of the performance of the forklift, the structure is compact and limited, the parking brake lever ratio is not large enough, parking on a slope is guaranteed, and a driver needs great force to operate.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a labor-saving parking brake mechanism, and the travel of a guy cable is basically completed in the front half angle of rotation of an operating handle through reasonable design of the travel path of the guy cable, and meanwhile, when larger operating force is needed in the rear half angle, the lever ratio of the operating handle is improved, and the operating force of an operator is reduced.
In order to achieve the above purpose, the invention adopts the following technical scheme:
A labor-saving parking brake mechanism comprises fixed guide brackets symmetrically arranged on a vehicle body, wherein the front side edges of the fixed guide brackets are arc-shaped slide ways, the fixed guide brackets are rotationally connected with mounting shafts, the mounting shafts are fixedly connected with operation handles used for driving the mounting shafts to rotate, a cable supporting frame is fixedly connected below the mounting shafts, a cable assembly is arranged at the contact position of the cable supporting frame and the arc-shaped slide ways in a leaning mode, and the cable assembly slides along the arc-shaped slide ways under the driving of the cable supporting frame.
Further, the inhaul cable assembly comprises an inhaul cable and a rotating shaft fixedly connected with the inhaul cable, and the rotating shaft is supported at the contact position of the inhaul cable supporting frame and the arc-shaped slideway. The middle part of axis of rotation has seted up the connection through-hole, the one end of cable wears to establish the connection through-hole and through adjusting nut and axis of rotation fixed connection. The parking brake mechanism enables the installation shaft to rotate relative to the fixed guide support through applying external force to the operation handle, the installation shaft drives the inhaul cable support frame to rotate simultaneously with the rotation of the installation shaft, and the rotation shaft slides along the track of the arc-shaped slideway under the driving of the inhaul cable support frame, so that the inhaul cable is driven to move. Thereby achieving the change of the stress arm of the inhaul cable, namely the change of the lever ratio. The design requirement of the path is that when the operating handle is pulled upwards to rotate around the mounting shaft for the first half angle, the travel of the inhaul cable is about four fifths of the total travel, and when the operating handle is pulled upwards to rotate around the mounting shaft for the second half angle, the lever ratio is rapidly increased, so that the action of relieving the operating force is achieved.
Further, the lower end of the operating handle is provided with a mounting hole which is fixedly connected with the mounting shaft. The operating handle is fixedly connected with the mounting shaft through the mounting hole.
Further, the inhaul cable support frame is V-shaped, a connecting hole which is fixedly connected with the installation shaft is formed in the upper end of the inhaul cable support frame, and the inhaul cable support frame is fixedly sleeved on the installation shaft through the connecting hole.
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the labor-saving parking brake mechanism, through reasonable design of the guy rope movement path, the guy rope travel is basically completed in the front half angle of rotation of the operating handle, and meanwhile, when larger operating force is needed in the rear half angle, the lever ratio is improved, and the operating force of an operator is reduced.
(2) The invention has simple structure, convenient installation and low input cost, and has better economic benefit.
(3) Compared with the current parking operation mechanism, the parking brake mechanism has small operating force and greatly improves the operation comfort.
Drawings
Fig. 1 is a schematic structural view of a parking brake mechanism.
Fig. 2 is an exploded view of the parking brake mechanism.
Fig. 3 is a schematic diagram of a parking brake mechanism.
The device comprises a 1-fixed guide bracket, a 101-arc-shaped slideway, a 2-installation shaft, a 3-operation handle, 301-installation holes, a 4-inhaul cable supporting frame, a 5-inhaul cable assembly, 501-inhaul cables, 502-rotating shafts, 503-connecting through holes and 504-adjusting nuts.
Detailed Description
The invention will be further described with reference to the drawings and examples. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "fixedly connected," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, directly connected, indirectly connected via an intermediate medium, or in communication with each other between two members. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances. The terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship based on that shown in the drawings, merely to facilitate description of the invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.
Example 1
As shown in fig. 1-2, the labor-saving parking brake mechanism comprises a fixed guide bracket 1 symmetrically arranged on a vehicle body, wherein the front side edge of the fixed guide bracket 1 is provided with an arc-shaped slideway 101, the fixed guide bracket 1 is rotatably connected with a mounting shaft 2, the mounting shaft 2 is fixedly sleeved with an operating handle 3 for driving the mounting shaft 2 to rotate, as an implementation mode, the lower end of the operating handle 3 is provided with a mounting hole 301, the operating handle 3 is fixedly connected with the mounting shaft 2 through the mounting hole 301, and of course, the fixed connection of the operating handle and the mounting shaft can be realized by welding and other modes by a person skilled in the art. The lower side fixed cover of installation axle 2 is equipped with V-arrangement cable support frame 4, connecting hole 401 that is used for with installation axle 2 fixed connection is seted up to cable support frame 4's upper end, cable support frame 4 passes through connecting hole 401 and installation axle 2 fixed connection. The cable assembly 5 is arranged at the contact position of the cable support frame 4 and the arc-shaped slide way 101, the cable assembly 5 comprises a cable 501 and a rotating shaft 502 fixedly connected with the cable 501, a connecting through hole 503 is formed in the middle of the rotating shaft 502, and one end of the cable 501 penetrates through the connecting through hole 503 and is fixedly connected with the rotating shaft 502 through an adjusting nut 504. The rotating shaft 502 is put on the contact position of the inhaul cable supporting frame 4 and the arc-shaped slideway 101. The stay support 4 supports the rotation shaft 502 during the upward pulling of the operation handle 3, and provides an upward component force to slide the rotation shaft 502 along the arc-shaped slide way 101, thereby changing the displacement of the zipper 501.
The parking brake mechanism is characterized in that an external force is applied to an operating handle 3 to enable a mounting shaft 2 to rotate relative to a fixed guide bracket 1, the mounting shaft 2 drives a guy rope support 4 to rotate simultaneously, and a rotating shaft 502 slides along the track of an arc-shaped slideway under the driving of the guy rope support 4, so that guy ropes are driven to move. Thereby achieving the change of the stress arm of the inhaul cable, namely the change of the lever ratio.
As shown in fig. 3, assuming that AB represents the motion track of the operating handle 3 along the arc-shaped slideway 101, arc EGDC represents the motion track of the operating handle 3, B represents the rotation center point of the operating handle 3, i.e. the installation shaft, F represents the fastening point of the zipper, G represents the length of the effectively driven lever, ED represents the motion track of the cable 501 when the operating handle 3 rotates around the front half angle of B during the upward pulling process of the operating handle 3, DC represents the motion track of the cable 501 when the operating handle 3 rotates around the rear half angle of B during the upward pulling process of the operating handle 3, wherein the included angle between BC and BD is equal to the included angle between BD and BE, and is alpha, i.e. the total travel angle 2α of the handle 3 is pulled up, let a represent the total travel of the zipper, c represents the travel amount of the zipper 501 when the operating handle 3 rotates around the front half angle, B represents the travel amount of the zipper at the rear half angle of the operating handle 3, beta is the included angle of the FC and FD, i.e. the angle of the corresponding to the pull 501 changes when the operating handle 3 pulls up the front half angle, θ is the included angle of FD and FE, i.e. the angle of the corresponding to the angle of the front half angle of the latch 501 when the handle 3 changes, and the angle of the following corresponding to the angle of the handle 3 changes, and the angle of the corresponding to the angle of the front half angle of the pull 501 changes:
The corresponding travel of the zipper when the operating handle rotates by the first half angle is c=l FD-lFE,
The corresponding travel of the zipper when the operating handle rotates for the second half angle is b=l FC-lFD,
The operating handle rotates the zipper stroke ratio that the front half angle, the back half angle correspond to:
total travel of the zipper a=b+c,
Lever ratio:
Then:
lever ratio change range in the process of rotating the front half angle of the operating handle:
Lever ratio change range in the process of rotating the rear half angle of the operating handle:
During the rotation of the operating handle 3, the length of BG is shortened from long, i.e. the lever ratio k is increased from small. The specific process is that the lever is smaller in the first half angle of rotation of the operating handle 3, namely the ED stage, so that the pulling height of the operating handle 3 is saved, and the lever is larger in the second half angle of rotation of the operating handle 3, namely the DC stage, so that the operating force of the operating handle 3 in the process is saved.
As a preferred embodiment, the length of AB, BE, BD, BC, FC, FD, FE is 263 mm, 83mm, 39 mm, 23 mm, 125 mm, 120 mm and 106 mm, the values of alpha, beta and theta are 22.5 degrees, 6 degrees and 24 degrees respectively, the stroke c=l FD-lFE =19 mm of the inhaul cable is changed in the first half angle process of the rotation of the operating handle, the change range of the lever ratio k is 3.2-6.8, the stroke b=l FC-lFD =5 mm of the inhaul cable is changed in the second half angle process of the rotation of the operating handle, and the change range of the lever ratio k is 6.8-11.4.
The manipulation force applied by the driver to the operating handle 3 during the transmission of the braking force by the slide fastener 501 is an increasing process. In the first 80% of the total travel of the cable, the increase of the tension force of the zipper 501 is small due to the elimination of the gap between the brake shoe and the brake drum or the gap between the friction plate and the spacer, which is shown in that the operating force of the driver to the operating handle is small, which corresponds to the weak braking effect provided at the beginning, the first half angle of rotation during the pulling-up of the operating handle 3 is set, and in the last 20% of the total travel of the cable, the friction force required by the consumption of the kinetic energy of the vehicle is sharply increased due to the contact between the brake shoe and the brake drum or between the friction plate and the spacer, the increase of the tension force of the zipper 501 is large, the operating force transmitted to the operating handle of the driver is large, i.e. the stronger braking effect is provided at the beginning, and the second half angle of rotation during the pulling-up of the operating handle 3 is set. The lever ratio-changing design is because the parking brake mechanism is stressed by no power for converting the kinetic energy of the vehicle before the brake shoes are contacted with the brake hub or before the wet friction plates are contacted in the braking process of the forklift, and the friction force of the parking brake mechanism is small, and when the brake shoes are contacted with the brake hub or the wet friction plates are contacted, the large positive pressure needs to be overcome, so that enough friction force is ensured to stop the vehicle, and the large power is needed to operate the brake mechanism. According to the labor-saving parking brake mechanism, through reasonable design of the guy rope movement path, the guy rope travel is basically completed in the front half angle of rotation of the operating handle, and meanwhile, when larger operating force is needed in the rear half angle, the lever ratio is improved, and the operating force of an operator is reduced.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910984731.7A CN110668361B (en) | 2019-10-16 | 2019-10-16 | A labor-saving parking brake mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910984731.7A CN110668361B (en) | 2019-10-16 | 2019-10-16 | A labor-saving parking brake mechanism |
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| Publication Number | Publication Date |
|---|---|
| CN110668361A CN110668361A (en) | 2020-01-10 |
| CN110668361B true CN110668361B (en) | 2025-02-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910984731.7A Active CN110668361B (en) | 2019-10-16 | 2019-10-16 | A labor-saving parking brake mechanism |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN211198498U (en) * | 2019-10-16 | 2020-08-07 | 安徽合力股份有限公司 | Labor-saving parking brake mechanism |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10254586B4 (en) * | 2002-11-22 | 2006-12-28 | Fico Cables, S.A., Rubi | Mechanism for adjusting the lever ratio of an actuating lever |
| KR100851133B1 (en) * | 2007-08-07 | 2008-08-08 | 현대자동차주식회사 | Lever non-variable parking lever device |
| CN101708715A (en) * | 2009-12-25 | 2010-05-19 | 奇瑞汽车股份有限公司 | Automobile hand braking operation device |
| CN202175032U (en) * | 2011-06-23 | 2012-03-28 | 奇瑞汽车股份有限公司 | Hand brake control device |
| CN206719189U (en) * | 2017-01-03 | 2017-12-08 | 北汽福田汽车股份有限公司 | For vehicle parking control mechanism and there is its vehicle |
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- 2019-10-16 CN CN201910984731.7A patent/CN110668361B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN211198498U (en) * | 2019-10-16 | 2020-08-07 | 安徽合力股份有限公司 | Labor-saving parking brake mechanism |
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| CN110668361A (en) | 2020-01-10 |
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