RU2360225C2 - Accelerated testing stand for ball bearings on failure from impact loading and material of ball bearings from impact action - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: applied shock testing stand has frame, an electric motor fixed on the frame, connected through a chain transmission to a worm gear, which provides for successive transmission of torque to an elastic clutch (6) and a flywheel (7) with a roller (8). Loading the balance beam (9) is provided for by the roller (8) when it overcomes the force of spring (12) of the loading mechanism (12, 13). This mechanism provides for changing the range of values of force for loading the spring (12) using a spring pre-compression mechanism (13), to provide for impact action of the balance beam (9) on the material or ball bearing. Changing frequency of applying dynamic loads is made possible by changing the number of rollers (8) on the flywheel (7). Oscillation amplitude values of the balance beam (9) can be changed by changing the radius of location of the roller (8) on the flywheel (7).

EFFECT: wider range of dynamic loads, determination of their service life and provision for simulating loads, similar to real operating conditions of ball bearings of an automobile suspension system.

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Description

The accelerated test bench for ball bearings for rejection of shock load and impact ball material refers to mechanical engineering, in particular to mechanical test benches for testing car assemblies, and can be used to test car ball bearings and ball bearing liner material.

A known stand [1] for testing steering link joints, comprising a bed, a gear motor with two output shafts, connecting levers, a loading mechanism for the tested joints.

The disadvantage is that this stand does not allow to expand the range of dynamic loads and simulate loads characteristic of the actual operating conditions of the ball bearing of the vehicle suspension. Unlike the steering link hinge, the ball joint is the suspension bearing unit to which the vehicle’s payload is transferred taking into account the dynamic action of the load.

A known installation [2] for impact testing of materials, containing dumped cargo, vertically mounted guides for cargo, step drums, motion transmission mechanism, two grippers for the sample and an electric drive for lifting the load. This setup allows you to expand technical capabilities through testing with an adjustable speed of movement of the test sample in the direction of impact.

The disadvantages are that this stand does not provide a mechanism for changing the load affecting the material, as well as the fact that for the second and subsequent shocks considerable time is spent on returning the unit to its original state.

Known accelerated test bench [3], containing a frame mounted on it an electric motor connected via a transmission with a worm gear. This stand provides an increase in the impact of various profiles of soil and road backgrounds on the acceleration of the limiting state of machines and their wear, and is selected as the closest analogue.

The disadvantage is that on this stand for the transmission of dynamic loads, eccentrics are used, which imitate the unevenness of the soil to a greater extent than the actual loads caused by the unevenness of the road surface.

The accelerated test bench for ball bearings for failure of the shock load and the material of the ball bearings by impact includes a frame, an electric motor mounted on it, connected through a transmission to the worm gear. The worm gear provides the transmission of torque to the elastic coupling and the flywheel with a roller, which provides the rocker load while overcoming the compression force of the spring loading mechanism, providing a change in the range of values of the spring loading force through the spring pre-compression mechanism. Changing the frequency of application of dynamic loads is ensured by changing the number of rollers on the flywheel. A change in the amplitude of the rocker arm oscillations can also be provided. The transmission between the electric motor and the worm gear may be chain.

The introduction of new elements and the relationships between them ensures the testing of the material and the ball bearings of the suspension of cars in different modes of impact.

Figure 1 shows a side view.

Figure 2 shows a top view.

The accelerated test bench for ball bearings for failure of impact load and material of ball bearings by impact includes the following elements:

1 - frame;

2 - electric motor;

3 - chain transmission;

4 - a worm gear;

5 - flywheel shaft;

6 - elastic coupling;

7 - flywheel;

8 - roller;

9 - rocker;

10 - rocker shaft;

11 - firing pin;

12 - spring;

13 - spring pre-compression mechanism;

14 - anvil;

15 - ball bearing;

16 - stand;

17 - emphasis.

On the accelerated test bench of ball bearings for failure of the shock load and the material of the ball bearings by impact, shown in Fig.1-2, attached to the frame 1, interconnected: an electric motor 2 and a worm gear 4 through a chain gear 3, flywheel shaft 5, flywheel 7 with roller 8 attached to it.

On the other side of the frame 1, a stop 17 is installed on the stand, to which a stand 16 is attached with a material or ball bearing 15 connected to the anvil 14, which is impacted by the hammer 11, mounted in the beam 9, swinging on the shaft 10.

In the middle part of the frame 1 there is a mechanism 13 for pre-compression of the spring 12.

There is a stand for accelerated testing of ball bearings for failure from shock load and material of ball bearings by impact as follows.

From the control panel, an electric motor 2 is turned on, transmitting torque through a chain gear 3 sequentially to a reducer 4, an elastic clutch 6, a flywheel shaft 5 with a roller 8, which transfers the load to the beam 9, swinging on the shaft 10 and acting on the ball bearing 15 through the anvil 14 by means of the striker 11, overcoming the compression force of the spring 12. The amount of force loading the material or ball bearing is controlled by changing the amount of pre-compression of the spring 12 by the mechanism 13. The frequency of the generated force is controlled by changing h weakly rollers 8 on the flywheel 7.

The stand 16 is mounted on a stop 17, which is mounted, with the possibility of movement, on the rack of the frame 1. It is possible to install not only anvils with a ball bearing, but also anvils with a sample of the material of the liner of the ball bearing.

The work of the stand provides an imitation of the operating conditions of the ball bearings. In particular, the reproducible loads created by the beam are similar to the loads caused by uneven road surfaces.

The proposed stand allows you to:

- create loads on the material or ball joints, similar to real loads caused by uneven pavement;

- change the amplitude of the rocker arm vibrations by changing the radius of the roller on the flywheel;

- change the range of values of the loading force using the mechanism of pre-compression of the spring;

- change the frequency of application of dynamic loads, reflecting the actual operation of the ball bearings of the suspension of a car by changing the number of rollers on the flywheel.

Information sources

1. A.c. SU 1182315 A, G01M 17/06.

2. A.c. SU 1276952 A1, G01N 3/30.

3. Patent RU 2019806 C1, G01M 17/00.

Claims (4)

1. A bench for accelerated tests of ball bearings for failure from impact load and material of ball bearings by impact, containing a frame, an electric motor (2) mounted on it, connected via a gear (3) to a worm gear (4), characterized in that the worm gear ( 4) provides the transmission of torque sequentially to the elastic coupling (6) and the flywheel (7) with a roller (8), which provides the load of the rocker arm (9) while overcoming the compression force of the spring (12) of the loading mechanism (12, 13), providing a range change power values zheniya spring (12) by a mechanism (13), spring preload to ensure the impact of the rocker (9) or on a spherical support material. 2. The stand according to claim 1, characterized in that the change in the frequency of application of dynamic loads is provided by changing the number of rollers (8) on the flywheel (7). 3. The stand according to claim 1 or 2, characterized in that it provides a change in the amplitude of the oscillations of the rocker arm (9). 4. The stand according to claim 1 or 2, characterized in that the transmission (3) between the electric motor (2) and the worm gear (4) is chain.

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