JPH0371654B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a brake testing device for testing the brakes of vehicles such as automobiles.
More specifically, the present invention relates to a brake testing device that can individually perform a brake test on each wheel without being restricted by the type of vehicle.

BACKGROUND OF THE INVENTION Conventionally, brake testing devices have been used to test the brakes of vehicles such as automobiles. In a typical conventional brake testing device, a pair of rollers are installed side by side, and with a wheel to be tested mounted on the rollers, the rollers are driven to rotate, while a brake is applied to the wheel. , the control force is measured by detecting the reaction force from the rollers. In such conventional brake testing equipment, the rollers are driven to rotate in only one direction, and when the vehicle's brakes are activated and control force is applied to the rollers, the reaction force transmitted from the rollers to the drive system is measured. The brake test is performed by detecting the Therefore, although it is possible to test the brakes in one direction, forward or backward, when testing in both directions, there is the inconvenience of having to change the direction of the vehicle. .

In addition, if the vehicle is equipped with a plurality of wheels and two or more wheels rotate in conjunction with each other, the application of the brake of one of the wheels in conjunction with each other Even if the brakes are bad, if the brakes on the other wheels are normal, it is impossible for conventional brake test equipment to detect this. For example, especially in the case of a four-wheel drive vehicle, the four wheels are always interlocked, so even if the brakes on one wheel are malfunctioning, the brakes on the other three wheels may be normal. For example, it will be camouflaged by these three normal wheels, making it impossible to detect that one wheel's brake is abnormal.

Purpose The present invention has been made in view of the above points, eliminates the drawbacks of the prior art as described above, has a novel configuration, and brakes each wheel of a vehicle independently of the vehicle type. The purpose of the present invention is to provide a brake testing device that allows accurate testing.
Yet another object of the present invention is to provide a brake testing device capable of simultaneously performing brake tests in both forward and reverse directions of a vehicle. Yet another object of the present invention is to provide a brake testing device capable of performing brake tests under conditions as close as possible to normal vehicle running conditions.

Configuration According to the present invention, a pair of carriers carrying wheels of a vehicle to be inspected is reciprocated along a predetermined movement path by a drive means, and at that time, a reaction force is transmitted from the carrier to the drive means. Detects force and performs a brake test. That is, the brake testing device of the present invention:
It has a carrier that supports the wheels of the vehicle, and the carrier is provided movably along a predetermined route. The carrier is operatively connected to a drive means by which it is driven for reciprocal movement along a predetermined path. The driving means can include a cylinder device such as an air cylinder or a power cylinder, a motor, or the like. In addition, when using an air cylinder, it is necessary to provide a compressed air source and a compressed air flow rate control device.

In one preferred embodiment, the carrier is formed into a flat plate, and the carrier on the flat plate is provided so as to be able to reciprocate on a rail. In a further preferred embodiment, however, the carrier is designed in the form of a roller, which is driven to rotate alternately in both directions. In addition, when rollers are used, it is preferable to provide a pair of rollers in parallel and support the wheels between them. Furthermore, when a brake is applied to a wheel carried on the carrier, a reaction force transmitted from the carrier to the drive means, that is, a force opposing the driving force applied from the drive means to the carrier is detected. A detection means is provided to determine the performance of the brake from the detected reaction force. Although various techniques can be used as such inspection means, in a preferred embodiment, a load cell that converts mechanical displacement into an electrical signal is used.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic plan view showing a brake testing device 1 constructed based on one embodiment of the present invention. FIG. 2 is a schematic side view of the device 1 of FIG. 1, with a motor vehicle 2 placed thereon as a vehicle to be tested. The brake testing device 1 has a base or frame 10 having a roughly rectangular shape, and on the frame 10 there are a total of four flat plates 12FR spaced apart from each other in the front, rear, left and right directions.
12FL, 12BR, and 12BL are installed.
These plates 12 constitute a carrier which individually carries each wheel 3 of the motor vehicle 2 to be inspected. Each plate 12 is provided so as to be able to reciprocate on a pair of corner rails 11a and 11b attached to the four corners of the frame 10, and therefore, as is clear from FIG. Rail engaging portions 12b are provided on the sides, and these rail engaging portions 12b engage with the rails 11 to define the reciprocating direction of the plate 12. Furthermore, the second
As is clear from the figure, in the illustrated example, a surface layer 12a is provided on the top of each plate 12, and this surface layer 12a is formed in the same condition as the road on which the automobile 2 normally travels. For example, the surface layer 12a can be formed from concrete or asphalt.

As is clear from FIG. 2, a bracket 12c is fixedly protruding from the bottom of each plate 12, and a load cell 27 is mounted on the bracket 12c. The load cell 27 is connected to one end of the connecting arm 21 (for the rear wheel) or 22 (for the front wheel) via a pin 25 (for the rear wheel) or 26 (for the front wheel). The other end of each of the left connecting arms 21a and 22a is attached to the left swinging arm 1 whose intermediate portion is fixed to the central shaft 18.
7a through pins 19a and 20a, respectively. Note that the swing arm 17a is fixed to the left end of the central shaft 18. Further, the shaft 18 is rotatably supported by a pair of bearings 35a and 35b fixed on the frame 10. An intermediate portion of a right swinging arm 17b is fixed to the right end of the shaft 18, so that the swinging arm 17 rotates integrally with the shaft 18. The swinging arm 17b is also the swinging arm 17a.
Similarly, connecting arms 21b and 22b are connected to both ends thereof via pins 19b and 20b (not shown), respectively.
These connecting arms 2
1b and 22b are connected to plates 12BR and 12FR, respectively, via respective load cells 27BR and 27FR (not shown).

On the other hand, a lever 16 is provided at the intermediate portion of the shaft 18 and is integral with the shaft and projects in the radial direction.The tip of the lever 16 is connected to the tip of the rod 13a of the cylinder device 13 via a pin 15. There is. The rod 13a is freely retractable by being retracted into the cylinder device 13 and protruded from it. The opposite side of the cylinder device 13 is connected to the frame 10 via a pin 14. Note that these pin connections provide pivotal support between two connected objects, and both objects are rotatable with respect to each other via the pins. In one embodiment, it is possible to use an air cylinder as the cylinder device 13, in which case a source of high pressure air and control of the flow of high pressure air therefrom can be used as the cylinder device 13.
It is necessary to provide a flow control device to supply the Further, if the cylinder device 13 is not of a two-way type structure in which the cylinder device 13 moves backward by supplying high-pressure air, it is possible to provide a biasing means for constantly biasing the rod 13a or the shaft 18 in one predetermined direction. is necessary. Furthermore, in a further embodiment it is possible to use a power cylinder as the cylinder device 13, in which case the retraction movement of the rod 13a is controlled by a motor.

Load cell 27 attached to each plate 12
detects the reaction force transmitted from the plate 12 and converts it into an electrical signal. Wiring 30 extending from each of these load cells 12 is connected to a data processing device 31 including a computer, etc., and the results obtained by the processing device 31 are displayed on a display device 32.

Next, the operation of the brake testing device 1 having the above configuration will be explained. The brake testing device 1 is disposed, for example, in a pit recessed in the floor of an inspection area, and a guide route to each plate 12 is formed. In the illustrated example, a car) is positioned at a predetermined position. In this state, the various wheels 3 of the vehicle 2 are carried on the corresponding plates 12. Next, when the cylinder device 13 is operated, the rod 1
Since the levers 3a move forward and backward synchronously, the lever 16
The shaft 18 is alternately and synchronously rotated in both directions. Since the swinging arms 17a and 17b are fixed to both ends of the shaft 18, these swinging arms 17a and 17b can be rotated clockwise and counterclockwise at a predetermined angle, as shown by the dotted arrows in FIG. Perform periodic rotational movements alternately. This rocking movement is therefore transmitted via the connecting arms 21 and 22 to each of the plates 12, so that the plates 12 move periodically along the rail 11 in the forward direction F and in the backward direction B indicated by the dotted arrows. Perform a reciprocating movement.

By the way, in the embodiment shown in FIGS. 1 and 2, the connecting arm 21a is connected to the swinging arm 17a.
The connecting arm 21b is connected to the lower end of the swinging arm 17b, and the connecting arm 22a is connected to the lower end of the swinging arm 17a, and the connecting arm 22b is connected to the lower end of the swinging arm 17b. It is connected to the bottom end. Therefore, the swing arms 1 fixed to the shaft 18 in the same orientation as each other
When 7a and 17b periodically rotate in both directions as shown by the dotted arrows, a pair of plates 12FR and 12BR that are aligned with each other in the moving direction and another pair of plates 12FL and 12BL are rotated from each other as shown by the dotted arrows. Periodically reciprocate in opposite directions. On the other hand, relative motion occurs in opposite directions between a pair of plates, ie, 12FR and 12FL or 12BR and 12BL, which are spaced apart and arranged in parallel in a direction perpendicular to the movement direction. In this state, the wheels 3 carried on each plate 12 are free to rotate in both directions according to the movement of the plates 12 due to friction with the plates 12.

Then, the brakes of the vehicle 2 are activated. Then, the braking force of the brake is transmitted to the plate 12, and the force that attempts to prevent the movement of the plate 12 is applied to the load cell 27 as a reaction force. Therefore, the load cell 27 converts this reaction force into an electrical signal, and the signal is individually supplied to the processing device 31 via the wiring 30. These signals are processed and the results of the brake test are displayed on the display device 32. In this case, each wheel can be brake tested individually and simultaneously in both forward and reverse directions.

In addition, in the case where the vehicle 2 to be inspected is a car that is always driven by four wheels, the four wheels 3 are interlocked with each other, and the brakes of three of the four wheels are normal, but the brakes of one of the wheels are normal. Even if the braking force of a wheel is poor, the braking force curve for that wheel is shown as a dotted line in line with the braking force curve for a normal brake, which is shown as a solid line, as shown in the graph of Figure 6. As shown in the figure, there is a time delay shown by time T ₁ due to differential gear bump crash, and by detecting the braking force curve in which this time delay exists, it is possible to accurately perform a brake test even in the case of a four-wheel drive vehicle. It is possible to do so. In addition, since the device 1 of the present invention has a structure in which driving forces in opposite directions are applied alternately and periodically to the wheels 3,
As shown in FIG. 6, the time delay caused by the backlash of the differential gear appears periodically, so it is possible to accurately and reliably test the braking performance of the wheels. Furthermore, plate 1
If each upper surface of the vehicle 2 is formed under the same conditions as on a normal road, it is possible to perform a brake test in a state as close as possible to the normal running state of the vehicle 2.

In addition, as a modification of the brake testing device 1 shown in FIGS. 1 and 2, a pair of plates 12FR
It is also possible to have a configuration of only 12FL or 12BR and 12BL, and for example, it is also possible to have a configuration of only part A as shown in FIG. Furthermore, as another modification, it is also possible to configure only one plate 12, in which case, for example, only one of the wheels of a two-wheeled vehicle or other vehicle can be moved forward or backward. Test braking performance in both directions simultaneously.

Next, a brake testing device 1' constructed based on another embodiment of the present invention shown in FIGS. 3 and 4 will be described. This brake testing device 1' has a very similar basic structure to the brake testing device 1 described above, and therefore, the same reference numerals are given to the same components to avoid duplication of explanation. The device 1' shown in FIGS. 3 and 4 is different from the device 1 shown in FIGS. swinging arms 17a and 17 of
b, and the left and right connecting arms 22a and 22b for the front wheels are similarly connected to the lower ends of the corresponding left and right swing arms 17a and 17b, respectively. Therefore, the plates 12FR and 12FL, which are arranged side by side in the left-right direction, perform periodic reciprocating motion in the same direction with the same phase, and the same is true for the plates 12BR and 12BL, which are arranged in parallel in the left-right direction. . However, there is relative movement in opposite directions between plates 12FR and 12BR or 12FL and 12BL that are aligned and spaced apart from each other in the longitudinal axis or direction of plate movement.

The embodiments shown in FIGS. 3 and 4 can also provide the same effects as the embodiments shown in FIGS. 1 and 2, and various modifications can be made as described above. .

Next, referring to FIG. 5, a brake inspection device 5 constructed according to yet another embodiment of the present invention will be described in detail. This test device 5 uses rollers as carriers for supporting the wheels to be tested. Many types of brake testing devices using such rollers are already in use on the market, and it is only necessary to improve such conventional roller-type testing devices that are already in use based on the present invention. Therefore, it is possible to configure the present invention relatively easily by leaving many of these parts untouched.

The brake testing device 5 shown in FIG.
are placed in parallel and spaced apart from each other. The roller 41 is an auxiliary roller and is rotatably supported between a pair of bearings 43a and 43b mounted on the frame 40. On the other hand, the roller 42 is a detection roller that is alternately and periodically applied with rotational force in opposite directions from a drive system to be described later, and therefore rotated alternately and periodically in the C direction and the opposite direction D. . A pair of rollers 41 and 42 are spaced apart by a predetermined distance and carry between them the wheels (not shown) of the vehicle to be tested. In addition, rollers 41 and 42
A table 47 is disposed between the two, and the table 47 is controlled to move up and down by a lifter 48, allowing the wheels to move in and out smoothly.

One end of the detection roller 42 is connected to a worm reduction device 46.
Worm wheel provided inside (not shown)
This worm wheel meshes with a worm (not shown) provided in the worm reduction device 46, and the worm is fixed to a pulley 49'. The pulley 49' is connected via a belt 45 to a motor 44 fixed on the frame 40. Further, a torque arm 49 formed integrally with the casing of the worm speed reducer extends in the radial direction of the worm wheel, and the tip of the torque arm 49 is connected to the frame 4.
It is connected to a load cell attached to 0.

Next, the operation of the brake testing device 5 shown in FIG. 5 will be explained. After the wheels are in place, the lifter is operated to lower table 47 so that the wheels are carried on rollers 41 and 42.
The motor 44 is then activated to periodically rotate in the opposite direction. Then, the rotational force is transferred to belt 4.
5. It is transmitted to the roller 42 via the pulley 49' and the worm reduction device 46, and the roller 42 is rotated periodically and alternately in the C direction and the D direction. Therefore, the wheels carried on rollers 41 and 42 also periodically rotate alternately in opposite directions. Then,
When the brake is applied, a braking force acts on the roller 42 due to friction between the wheel and the roller 42, and this is transmitted to the worm speed reduction device 46 as a reaction force. Then, this reaction force is generated by 46 of the worm deceleration device.
The torque is transmitted to the torque arm 49 through the casing of the motor, the torque is detected by the load cell 50 and converted into an electrical signal, and then the braking performance can be measured based on the principle explained with reference to FIG. It is.

Although FIG. 5 shows a configuration that can support only one wheel of a vehicle, the configuration shown in FIG.
It is also possible to measure two wheels at the same time by arranging them in parallel and spaced apart in the longitudinal or lateral direction, or as shown in FIGS. 1 and 3, four sets of rollers It is also possible to provide a configuration in which the pairs are arranged spaced apart from each other in the left and right front and back, and the four wheels are tested individually and simultaneously by processing the detection signal from the load cell of each roller pair.

Although specific embodiments of the present invention have been described in detail above, the present invention should not be limited only to these specific examples, and various modifications may be made without departing from the technical scope of the present invention. Of course, it is possible.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view of a plate-type brake testing apparatus constructed in accordance with one embodiment of the present invention, FIG. 2 is a schematic side view of the apparatus of FIG. 1, and FIG. 3 is another embodiment of the present invention. FIG. 4 is a schematic side view of the device of FIG. 3; FIG. 5 is a schematic plan view of a plate-type brake testing device constructed according to an embodiment of the invention; FIG. FIG. 6 is a schematic perspective view of a type brake testing device, and FIG. 6 is a graph showing a delay in the braking force curve due to backlash of the differential gear. (Explanation of symbols), 10: Frame, 12: Plate, 13: Cylinder device, 17: Swing arm,
18: Central shaft, 21, 22: Connection arm,
27: Load cell.

Claims (1)

[Scope of Claims] 1. A carrier for supporting wheels of a vehicle, a holding means for holding the carrier so as to be movable along a predetermined movement route, and a holding member for holding the carrier in a first direction along the movement route. A brake testing device comprising: drive means for moving the carrier body alternately in a second direction opposite thereto; and detection means for detecting a reaction force applied from the carrier to the drive means. 2. The device according to claim 1, wherein the carrier has a flat plate shape. 3. The device according to claim 2, wherein the upper surface of the flat plate-shaped carrier is formed in the same state as a general road surface. 4. The device according to claim 3, wherein the upper surface layer of the flat support is made of concrete or asphalt. 5. The device according to claim 2, wherein the flat carrier is provided so as to be able to reciprocate on a rail. 6. The device according to claim 5, wherein the drive means comprises a drive source and a coupling means for coupling the drive source to the carrier. 7. The device according to claim 6, wherein the drive source is an air cylinder. 8. The device according to claim 7, wherein the drive source is a power cylinder. 9 In claim 2, the pair of flat carriers are arranged in parallel and spaced apart from each other in a direction perpendicular to the moving direction, and the pair of carriers have a predetermined phase difference. A device characterized in that it is periodically moved back and forth. 10. The device according to claim 9, wherein the phase difference is 180 degrees. 11 In claim 2, the pair of flat carriers are arranged apart from each other along the moving direction, and the pair of carriers are periodically moved with a predetermined phase difference. A device characterized by being moved back and forth. 12. The device according to claim 11, wherein the phase difference is 180 degrees. 13. The device according to claim 1, wherein the carrier is a roller and is driven and rotated alternately in both directions by the drive means. 14 In claim 13, an auxiliary roller is arranged in parallel and spaced apart from the roller,
Device characterized in that the wheel is carried between these two rollers. 15. The device according to claim 14, wherein the drive means includes a motor and a transmission mechanism that transmits the rotational force of the motor to the carrier roller. 16. The device according to claim 1, wherein the detection means is a load cell and converts the reaction force from the carrier into an electrical signal.