CN103308236B - Wheel constraining device for detecting braking force of automobile rack - Google Patents

Abstract

The invention discloses an auxiliary device for automobile detection equipment in the field of automobile industry, that is, a wheel restraint device for automobile bench braking force detection, which aims to solve the problem that the inspected automobile is unstable in the existing automobile bench braking force detection. state, resulting in a large error in the detection of the braking force. The device is composed of a restraint roller mechanism, a lifting hydraulic system and a positioning hydraulic system. A horizontal forward restraint is imposed on the test wheel through the restraint roller, so that the test vehicle is in a stable state. The two sets of hydraulic systems for lifting and positioning are connected in a "herringbone" shape through the connecting arm, which can realize the free movement of the restraining drum in the two-dimensional plane.

Description

Vehicle bench braking force detection wheel restraint device

technical field

The invention relates to an auxiliary detection device of automobile detection equipment in the field of automobile industry, more specifically, it relates to a wheel restraint device for detection of braking force of an automobile bench.

Background technique

The number of cars in use in my country is growing rapidly. With the increase in the number and speed of cars, the driving safety of cars is very important. Therefore, testing the braking performance of automobiles has become a key item stipulated by regulations. So far, most of the automobile testing stations in my country have tested the braking force of in-use vehicles on the roller brake test bench or flat brake bench. The braking force is convenient, stable, safe, fast, and repeatable, and has been widely used. There are three states when the vehicle is tested for braking force on the test bench, namely stable state, unsteady state and critical state. In the steady state, the adhesion coefficient of the test wheel is fully utilized, and the test wheel is in contact with both the front and rear rollers of the bench, and both have adhesion. The unsteady state is the state in which the test wheel is separated from the front roller and only contacts the rear roller, or the test wheel moves out of the test stand. A critical state is a critical condition between a steady state and an unsteady state. Only in a stable state can the real maximum braking capacity test of the tested vehicle be realized. When testing the braking force of the automobile bench, after the wheel under test is locked, the braking reaction force of the brake roller on the wheel will cause the vehicle under test to move out of the test stand or leave the front roller in an unstable state. This phenomenon will cause The braking force of the test does not match the actual braking force of the car, which is easy to cause misjudgment. At present, there is still no effective and convenient way to solve the above problems. The traditional method is to tow and fix the vehicle to solve such problems. This method is very effective in the research and test of a single vehicle, but it cannot be applied to the detection line of the assembly line.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the problem that the inspected automobile is in an unstable state when the existing automobile braking force detection station performs automobile bench braking force detection, and to provide a method for imposing a constraint on the test wheel of the inspected automobile so that the Check the vehicle bench brake force detection wheel restraint device in a stable state.

Referring to Figure 1 to Figure 12, in order to solve the above technical problems, the present invention adopts the following technical solutions to achieve.

The wheel restraint device for detecting the braking force of the automobile bench is composed of a restraint roller mechanism B, a lifting hydraulic system C, and a positioning hydraulic system D. The bottom surface of the lifting hydraulic system C is lower than that of the positioning hydraulic system D. System D is connected in a "herringbone" shape.

The restraining roller mechanism B described in the technical solution is composed of a restraining roller 1 , a roller end cover 2 , a roller shaft 3 , a roller bushing 4 , an outer spherical bearing 5 and a connecting arm 6 .

The two ends of the restraint roller 1 are welded and sealed with a stepped roller end cover 2 with a round hole processed in the middle, and the end of the roller shaft 3 covered with the roller bushing 4 is connected with the inner ring of the bearing 5 through interference fit, and the outer spherical bearing 5 is connected with the inner ring of the bearing 5. The bearing seat hole at the upper end of the arm 6 is spherically fitted and connected, the roller shaft 3 is connected with the middle circular hole of the roller end cover 2 with an interference fit, and the roller bushing 4 is sleeved on the outside of the other end of the roller shaft 3 .

Constraint drum 1 is a cylindrical part made of hollow steel pipe, and the inner two ends are processed into a stepped shape.

One end of the drum shaft 3 is processed into a stepped shape.

The lifting hydraulic system C described in the technical solution is mainly composed of a pull-wire displacement sensor 7, a fixed base of the pull-wire displacement sensor 8, a hydraulic rod 9, a hydraulic cylinder upper flange 10, a hydraulic cylinder body 11, a hydraulic cylinder lower flange 12, a lower Shaft joint 13, fixed base 14 and pivot pin 15 form.

The wire-type displacement sensor 7 is fixed on the fixed base 8 of the wire-type displacement sensor with bolts, the fixed base 8 of the wire-type displacement sensor is fixed on the outside of the connecting arm 6 with bolts, and the end of the wire of the wire-type displacement sensor 7 is fixed on the hydraulic cylinder with bolts. Outside the flange 10, the upper end of the hydraulic rod 9 is threadedly connected to the connecting hole at the lower end of the connecting arm 6, the lower flange 12 of the hydraulic cylinder is threadedly connected to the lower shaft joint 13, and the shaft pin 15 is inserted into the connecting hole of the lower shaft joint 13 and fixed. In the base 14 connection holes, the outer surface of the shaft pin 15 is in clearance fit with the inner surface of the lower shaft joint 13 connection holes and the inner surface of the fixed base 14 connection holes, and the fixed base 14 is fixed on the ground with expansion bolts.

The positioning hydraulic system D described in the technical solution is mainly composed of a pin load cell 16, a pin load cell fixed stopper 17, an upper shaft joint 19, a hydraulic rod 9, a hydraulic cylinder upper flange 10, a hydraulic cylinder body 11, a hydraulic The cylinder lower flange 12, the lower shaft joint 13, the fixed base 14 and the shaft pin 15 are composed.

The connection hole at the lower end of the upper shaft joint 19 is screwed and fixedly connected with the upper end of the hydraulic rod 9, and the shaft pin load cell 16 is inserted into the connection hole at the middle part of the connecting arm 6 and the connection hole of the upper shaft joint 19. The outer surface of the shaft pin load cell 16 is Cooperate with the inner surface of the connecting hole in the middle of the connecting arm 6 and the inner surface of the connecting hole of the upper shaft joint 19. When inserting the shaft pin load cell 16, point the end with the shaft pin load cell outlet screw 18 to the outside, and the shaft pin load cell The fixed stopper 17 is inserted into the fixed groove at the other end of the shaft pin load cell 16, the lower flange 12 of the hydraulic cylinder is fixedly connected with the lower shaft joint 13, and the shaft pin 15 is inserted into the connection hole of the lower shaft joint 13 and the connection hole of the fixed base 14 Inside, the outer surface of the shaft pin 15 is in clearance fit with the inner surface of the connection hole of the lower shaft joint 13 and the inner surface of the connection hole of the fixed base 14, and the fixed base 14 is fixed on the ground with expansion bolts.

The beneficial effects of the present invention are:

(1) The vehicle wheel restraint device for detecting the braking force of the vehicle bench according to the present invention, by imposing a horizontal forward constraint on the test wheel, makes the vehicle under inspection in a stable state, which solves the problem of the existing vehicle braking force testing platform. The problem that the car under test is in an unstable state when the brake force is detected.

(2) The brake force detection wheel restraint device of the automobile bench according to the present invention adopts the cable-type displacement sensor and the shaft pin force sensor to control the expansion and contraction of the hydraulic cylinder, and can control the expansion and contraction of the hydraulic expansion system according to the size of different wheels. It realizes the cooperation with the test wheel of the inspected vehicle and has universality.

(3) The wheel restraint device for detecting the braking force of the automobile bench according to the present invention adopts a hydraulic telescopic system to realize the lifting and positioning of the restraint roller, and has a simple structure, and the hydraulic system can provide a large enough restraint force on the test wheel to ensure structural stability.

(4) In the vehicle bench braking force detection wheel restraint device described in the present invention, the restraint roller is designed to be connected with a ball bearing. While constraining the test wheel, it rotates together with the test wheel, so that the test wheel is in a stable state. It will not interfere with the braking force test, and then realize the real maximum braking capacity test of the tested car. the

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing and embodiment:

Figure 1 is an axonometric projection view from the front of the working state of the vehicle bench braking force testing wheel restraint device and the bench braking force testing platform A.

Fig. 2 is an axonometric projection view viewed from the front in a non-working state when the wheel restraint device for detecting the braking force of the vehicle bench and the braking force testing platform A of the bench are matched.

Figure 3 is a left view of the working state of the vehicle bench braking force detection wheel restraint device and the bench braking force detection platform A.

Figure 4 is the axonometric projection view from the front after removing the foundation and the working state of the wheel restraint device for vehicle bench braking force testing and the bench braking force testing platform A.

Figure 5 is the axonometric projection view from the front after removing the foundation in the non-working state of the vehicle bench braking force testing wheel restraint device and the bench braking force testing platform A.

Figure 6 is an axonometric projection view of the structural assembly of the vehicle bench brake force detection wheel restraint device viewed from the front.

Fig. 7 is an axonometric projection view of the constraining roller mechanism B viewed from the front in the wheel constraining device for detecting the braking force of the automobile bench.

Fig. 8 is a cross-sectional view of the structural assembly of the constraining roller mechanism B in the wheel constraining device for detecting the braking force of the automobile bench viewed from the front.

Figure 9 is an axonometric projection view of the structural assembly of the connecting arm 6 viewed from the front and a cross-sectional view of the connecting arm 6 viewed from the left in the braking force detection wheel restraint device of the automobile bench.

Figure 10 is a structural assembly diagram of the positioning hydraulic system C in the wheel restraint device for detecting the braking force of the automobile bench. the

Figure 11 is a structural assembly diagram of the axle pin load cell 16 in the wheel restraint device for detecting the braking force of the automobile bench.

Fig. 12 is a schematic diagram of the installation positions of the cable-type displacement sensor 7 and the pin load cell 16 in the wheel restraint device for detecting the braking force of the automobile bench.

In the figure: A. Vehicle bench braking force testing platform, B. Restraining roller mechanism, C. Lifting hydraulic system, D. Positioning hydraulic system, 1. Restraining roller, 2. Roller end cover, 3. Roller shaft, 4. Roller bushing, 5. Outer spherical bearing, 6. Connecting arm, 7. Cable-type displacement sensor, 8. Fixed base of cable-type displacement sensor, 9. Hydraulic rod, 10. Upper flange of hydraulic cylinder, 11. Hydraulic cylinder block, 12. Lower flange of hydraulic cylinder, 13. Lower shaft joint, 14. Fixed base, 15. Pivot pin, 16. Pivot pin load cell, 17. Pivot pin load cell fixed block, 18. Pivot pin load cell Outlet screw, 19. Upper shaft joint.

Detailed ways

Below in conjunction with accompanying drawing, the present invention will be described in further detail:

Referring to Fig. 1 to Fig. 12, the wheel restraint device for detecting the braking force of the automobile bench is composed of a restraint roller mechanism B, a lifting hydraulic system C, and a positioning hydraulic system D. The lifting hydraulic system C constrains the movement of the roller mechanism B in the vertical direction, and the positioning hydraulic system D completes the restriction of the movement of the roller mechanism B in the horizontal direction. The bottom surface of the lifting hydraulic system C is installed lower than the bottom surface of the positioning hydraulic system D, and the lifting hydraulic system C and the positioning hydraulic system D are connected in a "herringbone" shape. the

The constrained roller mechanism B is composed of a constrained roller 1 , a roller end cover 2 , a roller shaft 3 , a roller bushing 4 , an outer spherical bearing 5 and a connecting arm 6 . Constraint roller 1 is a cylindrical part made of hollow steel pipes. The inner two ends are processed into a stepped shape. shape, and is connected with the middle round hole of the roller cover 2 by interference fit, the roller bushing 4 is set on the outer side of the other end of the roller shaft 3, and the end of the roller shaft 3 with the roller bushing 4 is passed through the inner ring of the bearing 5 Ying fit is connected, and outer spherical bearing 5 is connected with the bearing seat hole spherical surface of connecting arm 6 upper ends.

The lifting hydraulic system C is mainly composed of a cable-type displacement sensor 7, a cable-type displacement sensor fixed base 8, a hydraulic rod 9, a hydraulic cylinder upper flange 10, a hydraulic cylinder body 11, a hydraulic cylinder lower flange 12, and a lower shaft joint 13, fixed base 14 and pin 15 are formed. The wire-type displacement sensor 7 is fixed on the fixed base 8 of the wire-type displacement sensor with bolts, the fixed base 8 of the wire-type displacement sensor is fixed on the outside of the connecting arm 6 with bolts, and the end of the wire of the wire-type displacement sensor 7 is fixed on the hydraulic cylinder with bolts. Outside the flange 10, the upper end of the hydraulic rod 9 is threadedly connected to the connecting hole at the lower end of the connecting arm 6, the lower flange 12 of the hydraulic cylinder is threadedly connected to the lower shaft joint 13, and the shaft pin 15 is inserted into the connecting hole of the lower shaft joint 13 and fixed. In the base 14 connection holes, the outer surface of the shaft pin 15 is in clearance fit with the inner surface of the lower shaft joint 13 connection holes and the inner surface of the fixed base 14 connection holes, and the fixed base 14 is fixed on the ground with expansion bolts.

The positioning hydraulic system D is mainly composed of a shaft pin load cell 16, a shaft pin load cell fixed block 17, an upper shaft joint 19, a hydraulic rod 9, a hydraulic cylinder upper flange 10, a hydraulic cylinder body 11, and a hydraulic cylinder lower Flange 12, lower shaft joint 13, fixed base 14 and shaft pin 15 form. The connection hole at the lower end of the upper shaft joint 19 is screwed and fixedly connected with the upper end of the hydraulic rod 9, and the shaft pin load cell 16 is inserted into the connection hole at the middle part of the connecting arm 6 and the connection hole of the upper shaft joint 19. The outer surface of the shaft pin load cell 16 is Cooperate with the inner surface of the connecting hole in the middle of the connecting arm 6 and the inner surface of the connecting hole of the upper shaft joint 19. When inserting the shaft pin load cell 16, point the end with the shaft pin load cell outlet screw 18 to the outside, and the shaft pin load cell The fixed stopper 17 is inserted into the fixed groove at the other end of the shaft pin load cell 16, the lower flange 12 of the hydraulic cylinder is fixedly connected with the lower shaft joint 13, and the shaft pin 15 is inserted into the connection hole of the lower shaft joint 13 and the connection hole of the fixed base 14 Inside, the outer surface of the shaft pin 15 is in clearance fit with the inner surface of the connection hole of the lower shaft joint 13 and the inner surface of the connection hole of the fixed base 14, and the fixed base 14 is fixed on the ground with expansion bolts.

The working principle and operation method of the vehicle bench brake force detection wheel restraint device:

First of all, before the vehicle to be inspected enters the bench A for braking force testing, it is necessary to check whether the vehicle bench braking force testing wheel restraint device is in a non-working state. After the equipment inspection is normal, the inspected car drives into the vehicle bench braking force detection station A, and the bench braking force detection station A in-position switch sends the detected car in-position signal to the single-chip microcomputer. After the single-chip microcomputer receives the in-position signal, it controls the lifting hydraulic system C. Lift the constraining drum 1 to a certain height according to the size of the test wheel, and the lifting height is controlled by the pull-wire displacement sensor 7 . After lifting to the specified height, the pull-wire displacement sensor 7 sends a signal to the single-chip microcomputer, and the single-chip microcomputer controls the lifting hydraulic system C to stop lifting. The single-chip computer then controls the positioning hydraulic system D to push the restraint roller 1 close to the test wheel. When the restraint roller 1 contacts the test wheel, the force of the pivot pin load cell 16 located in the middle of the connecting arm 6 will change, and the pivot pin load cell 16 Immediately send a force change signal to the single-chip microcomputer, and the single-chip microcomputer controls the positioning hydraulic system D to stop moving after receiving the signal. When the positioning hydraulic system D pushes the restraint roller 1 close to the test wheel, the lifting hydraulic system C needs to cooperate accordingly to ensure that the restraint roller 1 is horizontally pushed close to the test wheel. After the constraint roller 1 is in place, the single-chip microcomputer controls the relay of the frame braking force detection platform A, so that the frame braking force detection platform A starts to work, and the vehicle platform braking force detection is performed. During the test, the restraint roller 1 rotates together with the test wheel, and after the test wheel is locked, the restraint roller 1 imposes a horizontal forward restraint on the test wheel, so that the test wheel is in a stable state. After the detection is completed, the single-chip microcomputer controls the lifting and positioning hydraulic system to return the restraint roller 1 to the initial position, that is, the non-working state, and the vehicle to be inspected drives out of the bench braking force testing platform A to complete the vehicle bench braking force testing.

Claims (4)

1. A vehicle bench braking force detection wheel restraint device, characterized in that the vehicle bench braking force detection wheel restraint device consists of a restraint roller mechanism (B), a lifting hydraulic system (C), a positioning hydraulic system ( D) composition, the bottom surface of the lifting hydraulic system (C) is installed lower than the bottom surface of the positioning hydraulic system (D), and the lifting hydraulic system (C) and the positioning hydraulic system (D) are connected in a "herringbone" shape. 2. The wheel restraint device for detecting the braking force of the automobile bench according to claim 1, characterized in that, the restraint roller mechanism (B) consists of a restraint roller (1), a roller end cover (2), a roller shaft (3 ), roller bushing (4), outer spherical bearing (5) and connecting arm (6); The two ends of the restraint roller (1) are welded and sealed with a stepped roller end cover (2) with a round hole processed in the middle, and the roller shaft (3) is connected with the middle round hole of the roller end cover (2) with interference fit, and the roller bushing ( 4) Set on the outer side of the other end of the roller shaft (3), the end of the roller shaft (3) sleeved with the roller bushing (4) is connected with the inner ring of the outer spherical bearing (5) with an interference fit, and the outer spherical bearing ( 5) Fit and connect with the spherical surface of the bearing seat hole at the upper end of the connecting arm (6). 3. The wheel restraint device for detecting the braking force of the automobile bench according to claim 1, characterized in that the lifting hydraulic system (C) is mainly composed of a cable-type displacement sensor (7), a cable-type displacement sensor fixed base (8), Hydraulic rod (9), hydraulic cylinder upper flange (10), hydraulic cylinder body (11), hydraulic cylinder lower flange (12), lower shaft joint (13), fixed base (14) and pivot pin (15) ; The pull-wire displacement sensor (7) is fixed on the fixed base of the pull-wire displacement sensor (8) with bolts, the fixed base of the pull-wire displacement sensor (8) is fixed on the outside of the connecting arm (6) with bolts, and the pull-wire displacement sensor (7) is pulled The end is fixed on the outer side of the upper flange (10) of the hydraulic cylinder with bolts, the upper end of the hydraulic rod (9) is threadedly connected to the connecting hole at the lower end of the connecting arm (6), and the lower flange (12) of the hydraulic cylinder is connected to the lower shaft The joint (13) is threaded and fixedly connected, the shaft pin (15) is inserted into the connection hole of the lower shaft joint (13) and the connection hole of the fixed base (14), the outer surface of the shaft pin (15) is connected to the inner surface of the lower shaft joint (13) connection hole The inner surface of the connection hole of the fixed base (14) is clearance fit, and the fixed base (14) is fixed on the ground with expansion bolts. 4. The wheel restraint device for detecting the braking force of the automobile bench according to claim 1, characterized in that the positioning hydraulic system (D) is mainly composed of a pin load cell (16), a pin load cell fixing block (17 ), upper shaft joint (19), hydraulic rod (9), hydraulic cylinder upper flange (10), hydraulic cylinder block (11), hydraulic cylinder lower flange (12), lower shaft joint (13), fixed base ( 14) and shaft pin (15); The connection hole at the lower end of the upper shaft joint (19) is threadedly connected to the upper end of the hydraulic rod (9), and the shaft pin load cell (16) is inserted into the connection hole in the middle of the connecting arm (6) and the connection hole of the upper shaft joint (19) Inside, the outer surface of the pin load cell (16) is in clearance fit with the inner surface of the connecting hole in the middle of the connecting arm (6) and the inner surface of the connecting hole of the upper shaft joint (19). When the pin load cell (16) is inserted, it will have One end of the shaft pin load cell outlet screw (18) points outward, the shaft pin load cell fixing block (17) is inserted into the fixing groove at the other end of the shaft pin load cell (16), and the lower flange of the hydraulic cylinder (12 ) is threaded and fixedly connected with the lower shaft joint (13), the shaft pin (15) is inserted into the connection hole of the lower shaft joint (13) and the connection hole of the fixed base (14), and the outer surface of the shaft pin (15) is connected to the lower shaft joint (13) The inner surface of the connection hole and the inner surface of the connection hole of the fixed base (14) are clearance fit, and the fixed base (14) is fixed on the ground with expansion bolts.