SU966532A1 - Stand for testing vehicle steering knuckle - Google Patents

Description

The invention relates to mechanical engineering, in particular to the tractor, and can be used when testing wheeled tractors in pro-. the process of their production and repair.

A stand for testing wheels under load is known, comprising a frame, mechanisms for mounting and driving a test wheel, a table equipped with a hydraulic mechanism for vertical lifting 1.

The disadvantage of the test bench is the unsatisfactory imitation of the actual conditions of operation of the steering knuckles.

Also known is a stand for testing the steering knuckles of vehicles, containing a base with running drums attached to it, connected to the drive, mechanisms of vertical, lateral loading and turning, made in the form of pneumatic cylinders of double action, pneumatic distribution system and control 2.

The disadvantage of the stand is increased intensity and size, the inability to simulate road conditions. The nature of the load (i.e. the frequency and magnitude of the lateral and vertical forces of the steering knuckles on

The known stand is determined by the number and height of the shoes attached to the cylindrical surface of the drums. Replacing the shoes of the same height with others, as well as changing their number and the way of fixing them on the drum can only be carried out when the stand is stopped. Consequently, on the well-known IMP bench, it is possible to create and maintain for a given period of time only the stationary nature of the load of the steering knuckles. This does not allow simulating the loads characteristic of the actual operating conditions of the mechanism.

The purpose of the invention is to approximate test conditions to real ones, as well as to increase the range of values and frequency of application of loads.

20

The goal is achieved by the fact that the mechanisms of vertical loading and rotation are made in the form of a retractable fist, kinematically connected with the test rotary fist, through a pivot-bearing assembly with a pneumatic cylinder of vertical loading and through a hinge connection with the pneumatic cylinder of rotation, and the mechanism of lateral loading is performed the form.

Claims (2)

30, a disk fixedly mounted on the wheel hub of the test knuckle and connected to the side loading pneumatic cylinder by means of rollers fixed on the pneumatic cylinder stem, and the pneumatic distributor and adjustment systems are made autonomous for each pneumatic cylinder. The drawing shows the scheme of the stand. The stand consists of a base 1,. electric motor 2 with a gearbox 3, a running drum 4, on which the wheel 5 of the test knuckle 6 is supported with a sliding fist 7, the pneumatic cylinder 8 of the vertical loading mechanism, the pneumatic cylinder 9 of the turning mechanism and the pneumatic cylinder 10 of the lateral loading mechanism, the pneumatic distributor 11 of the vertical loading mechanism 12, the throttle 13 and the oil sprayer 14, the pneumatic distributor 15 of the mechanisms of rotation and lateral loading with the valve 16, the throttle 17 and the oil of the pulverizer 18. The pneumatic cylinder 8 is connected to the extendable lacquer 7 through the hinge-bearing unit 19, the pneumatic cylinder 9 has a hinge connection 20 with the pin of the retractable knuckle 7, the pneumatic cylinder 10 is connected with a bearing unit 21 with a disk 22 attached to the wheel hub 5. On the rods of the pneumatic cylinders 8 and 9 are adjustable packs 23 and 24. The stand works as follows. When rotating with different frequency of the wheel 5, performed by the electric motor 2 through the gearbox 3 and the jogging drum 4, the cycling load from the pneumatic cylinder 8 of the vertical loading mechanism and from the pneumatic cylinder 10 of the lateral loading mechanism is transmitted to the steering knuckle 6. In this case, the force of the pneumatic cylinder 8 is transmitted through the pivot-bearing unit 19 and the sliding fist 7, and the force of the pneumatic cylinder 10 of the side loading mechanism — through the bearing unit 21, the disk 22 and the hub of the wheel 5. Synchronously with the pneumatic cylinder 10, the pneumatic cylinder 9 of the turning mechanism is connected by a hinge joint Zyu 20 with a fist 7.You, moving fist 7,. perceived force of pneumatic cylinders 8 and 9, makes reciprocating and reciprocating movement relative to the vertical knuckle axle 6. The vertical load is regulated in magnitude and frequency by a pneumatic valve 12, a pneumatic distributor 11, switched by an adjustable stop 23 and a throttle 13. The side load on the wheels and the throttle 13. in terms of size and frequency, they vary in a similar manner to pneumatic valve 16., pneumatic distributor 15, adjusting "lm by stop 24 and throttle 17. Rod rods of cylinders 8-10 lubrications The oils come from the oil sprinklers 14 and 18. The combined effect of the pneumatic cylinders of all the mechanisms on the test knuckle, which varied during the operation of the stand, simulates the conditions of its work arising from the operation of the tractors with the entire spectrum of loads. The proposed stand can be used to conduct accelerated wear tests on the cylindrical surfaces of both new and repaired steering knuckles. Using it allows you to significantly reduce the time of delivery of products to production, significantly reduce the cost of obtaining information about its reliability., Invention 1. The bench for testing the steering knuckles of vehicles containing the base with the running drums fixed on it, connected to 1and to the drive, the mechanisms of vertical, lateral loading and rotation, made in the form of pneumatic cylinders of double action of the system of pneumatic distributor and control, which is the same. That, in order to bring the test conditions closer to real conditions, the vertical loading and rotation mechanisms were made in the form of a retractable knot kinematically connected with the test knuckle through a hinged bearing assembly with a pneumatic cylinder of vertical loading and through a hinge connection with a swing pneumatic cylinder. and the side loading mechanism is made in the form of a disk of the test knuckle fixed on the wheel hub and connected to the side loading pneumatic cylinder by means of rollers mounted on the rod of the pneumatic cylinder. 2. A stand according to claim 1, characterized in that, in order to increase the range of magnitudes and frequencies of application of loads, the pneumatic distribution and control systems are autonomous for each pneumatic cylinder. Sources of information,: taken into account during the examination 1. USSR author's certificate number 586853, cl. G 01 M 13/02, 1968. 2. Utkin-Lyubovtsev OL and others. The method of accelerated bench tests on the durability of the front axles of wheeled tractors.-Works NLGI.1971, p.35-36 (prototype). V //////////////////) /////////) /////////; y ///.  f compressed air