SU1318829A1 - Bench for testing wheels - Google Patents

Abstract

The invention relates to a wall for testing vehicle wheels under load, and is intended to extend the range of load effects on a wheel. A test wheel mounted on a fixed frame (operating in slave or driving mode) creates a vertical and horizontal load with variable frequency and amplitude using a hydraulic cylinder that presses the wheel to the table, which can be horizontally displaced using a hydraulic cylinder. The control of the hydraulic cylinders is carried out by means of two-position valves 22 and 14 installed on the supply main. The distributor 14 is controlled by a cam mechanism 15 which is driven in rotation by means of a variable DC drive 16. The corresponding pressure in the hydraulic cylinders is created using a retaining valve 17. 2 Il. with $ (L d 00 00 00 to with ig..2

Description

The invention relates to stands for testing the wheels of transport vehicles under load.

The purpose of the invention is to expand the range of load effects on the wheel.

FIG. 1 schematically shows a stand, a general VIEW} in FIG. 2 is a control circuit of a table or wheel movement mechanism;

The wheel test bench consists of a frame t, in which test wheel 2 is fixed with drive mechanisms (not shown) and mounted 3 and 4 to racks 5 and 6, and. table 7. The mechanisms for moving the test wheel 2 and table 7 consist of hydraulic cylinders 8 and 9. Each of the hydraulic cylinders 8 and 9 has a control system, the pressure in the hydraulic system of which is created by a pump 10, is controlled by a safety valve 11 and is controlled by a pressure gauge 12 connected to the oil pipe through the damper 13. The hydraulic actuator contains a two-position valve 14, controlled by a cam mechanism consisting of a cam 15 and an adjustable drive for its rotation, made in the form of a direct current motor 16 . One of the outputs of the distributor 14 is connected to the drain via a retaining valve 17. The engine 16 is powered by an autotransformer 18 and an attenuator 19. To dampen hydraulic shocks when dropping oil into the oil tank 20, a damper 21 is installed. a distributor 22, and for registering pulsations a strain gauge pressure sensor 23 is installed, which is connected to the oil pipe through a damper 24 and is electrically connected to a recording device 25 through an amplifier 26.

The stand works as follows. The safety valve 11 sets the pressure corresponding to the pressure, retaining valve

Mr. 17 - pressure. The pump 10 is turned on, the distributor 22 is placed in a position in which the oil through the distributor 14 enters the upper cavity of the hydraulic cylinder 8. The cam mechanism 15 is activated.

At the same time in the initial position of the cam 15 oil through the distributor.

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enters the upper cavity of the hydraulic cylinder 8 and pressure is established there. When turning the cam, the distributor 14 switches and

bypasses the oil from the pump 10 to the drain, and the upper CAVITY of the hydraulic cylinder 8 is connected to the drain through the retaining valve 17 and the pressure in the upper cavity of the hydraulic cylinder 8 decreases to the value P.,.

IN

This embodiment of the wheel loading mechanism provides periodic pressure on the test wheel.

The mechanism for the reciprocating movement of the table works as follows. The cam 15 is articulated with the spool of the two-position distributor 22. In this case, in one revolution

The cam table performs one reciprocating movement (left and right) with a change in the speed of movement in curl from the cam position (the degree of oil flow through

distributor) and its frequency of rotation. Through a half turn of the cam, the distributor spool (through the cam) moves to another cavity of the distributor and the table moves in the opposite direction.

The mechanism for loading the wheel and the drive for moving the table is designed to create a load on the wheel and move the table with variable frequency and amplitude.

After the test cycle has been completed, the cam mechanism is turned off. The reciprocating motion of the table is stopped. The distributor 22 switches to the second position and the oil from the pump 10 enters the lower cavity of the hydraulic cylinder 8, the test wheel 2 rises.

The use of the proposed stand allows you to bring bench tests closer to realistic road conditions, to obtain reliable test results and to reduce the test time.

Vehicle.

Claims (1)

Invention Formula The wheel test bench, which contained a frame with a table for interaction with the wheel under test, the mechanism for fastening and driving the wheel under test, the table transfer cylinders and the wheels communicated with the system us supplying pressure to hydraulic cylinders using pumps, characterized in that, in order to expand the range of load effects on the wheel, each pressure supply system is equipped with two two-way spool distributors mounted on the hydraulic main supplying the hydraulic cylinder, one of the hydraulic distributor ports communicating with on 188294 the suction cylinder and the rod cavity of the hydraulic cylinder, the second input of the first hydraulic distributor communicated with the hydraulic cylinder cavity, the second input f of the second hydraulic distributor communicated with the drain and is equipped with a sub-valve, and the spool of the second hydraulic distributor is controlled by means of a jaw mechanism, when the controller is rotating, the regulator has a valve. . 1 Editor S. Pekar Compiled by M. Lsko Tehred A. Kravchuk Proofreader M. Pojo Order 2499/33 Circulation 776 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4