SU931547A1 - Rack for testing vehicle brakes - Google Patents

Description

I

This invention relates to a brake test technique, and more specifically to stands used to test the bargaining of vehicles.

A stand for testing vehicles is known, containing supports for mounting a vehicle and a loader consisting of electromagnets and bands mounted on the hubs of the driving wheels of a test vehicle made of ferromagnetic material G P.

A disadvantage of this device is that the use of metal bands worn on the wheels distorts the test results of the braking system of vehicles by changing the force of adhesion of the vehicle to the support.

A stand containing drums, an actuator, a measuring system% (and a loader including a winch or a power cylinder and a cable terminated in a chain that covers the bridge beam of a test vehicle 2 is known.

A disadvantage of the known device is the distortion of the test results due to the fact that the wheels of the test vehicle are equipped with separate load carriers, which creates difficulties in creating equal loads on the knee, as well as

10 inconvenience in maintenance and a certain danger in the operation of the stand, since the maintenance personnel has to work under the vehicle in cramped conditions.

The closest to the proposed technical entity is a stand containing supporting drums, drive, measuring equipment

Claims (3)

H and the loader, which is a hydraulic cylinder mounted on a support, equipped with a kinematic connection for connection with the test vehicle at a point located in the vertical plane passing through the longitudinal axis of the DZG bench. The disadvantages of the known device are inconvenience in maintenance and a certain danger during the operation of the stand, since the maintenance personnel has to work under the vehicle in cramped conditions. The purpose of the invention is to improve working conditions during the operation of the stand. This goal is achieved by the fact that in the stand the kinematic connection is made in the form of a pivot arm mounted on the rack, one end of which is connected to the hydraulic cylinder and the other is equipped with a support plate installed in the body of the test vehicle. In addition, the support plate is connected to the end of the pivoting lever by means of a rod perpendicular to the longitudinal axis of the lever. The drawing shows the stand with the test vehicle. The stand for testing vehicle brakes contains drums 1, drive 2, kinematically combined with drums 1, a follower roller 3 with speed and track sensors and a loader consisting of lever i mounted on a stand 5 rotatably around a stand axis 5 6 rolling bearings. One end of the lever is connected, with a pin, to the rod 7 of the hydraulic cylinder 8 mounted on the base plate 9 in the fastening assembly 10, made, for example, in the form of brackets. At the other end of the lever, a pin is fastened, consisting of a connecting rod 11 and a support plate 12, while the connecting rod 11 is set so that the point of application of forces of the lever 1 and the center of gravity of the support plate 12 lying on the axis of the connecting rod 11, perpendicular the axis of the lever, and the length of the lever is such that the point of application of the force of the lever k is in a plane passing through the longitudinal axis of the stand perpendicular to its base. The stand works as follows. To ensure that the vehicle enters the stand, the lever k is deployed parallel to the longitudinal axis of the stand. The vehicle is mounted on the reels 1, then the lever k is turned to the working position and fixed on the rod 7 of the hydraulic cylinder 8. The base plate 12 is installed on the floor of the test vehicle at an equal distance from its sides. After that, the hydraulic system of the stand is turned on, the working fluid under pressure is fed into the lower cavity of the hydraulic cylinder 8, the rod 7 presses the lever k, lift its end, and the plate transfers the load to the wheels of the test vehicle. The drive of the stand 2 is turned on and the drums 1 and the wheels are turned up to the speed of the beginning of braking, and then the wheels are braked by the brake system of the vehicle. The follower roller 3 is pressed against the wheel at the moment of braking, and the sensors are mounted. on it, record the parameters of the braking process. The use of the proposed wall allows not only to improve the working conditions and safety of the personnel servicing the stand, since it eliminates the need to work in cramped conditions under the car, but also to obtain more reliable test results, since the vertical loading force applied at equal distance from the sides, automatically loads the driving wheels evenly and allows to more accurately simulate the load, bringing the test to real conditions, the operation of vehicles. Claim 1. A vehicle brake test bench comprising support drums, an actuator, measuring equipment and a loader, which is a support-mounted hydraulic cylinder equipped with a kinematic link for connection with the test vehicle at a point in the vertical plane passing through the longitudinal axis of the stand, characterized in that, in order to improve the working conditions during the operation of the stand, the kinematic connection is made in the form of Foot lever, one end of which is connected to the hydraulic cylinder, and the other is equipped with a base plate; installed in the body of the test vehicle. 2. Stand pb p.1, about tl and h and rout and so that the support plate is connected with the end of the pivot arm SSIS S 0 by means of a rod perpendicular to the longitudinal axis of the lever. Sources of information taken into account during the examination 1. USSR Author's Certificate No., cl. B 60 T 17/22, E7. 2. USSR author's certificate 1h 6 46123, cl. B 60 T 17/22, 1975. 3. USSR author's certificate №, cl. B 60 T 17/22, 1977 (prototype).