SU756271A1 - Friction machine - Google Patents

Description

The invention relates to a testing technique for studying friction at low temperatures.

A friction machine is known that contains a housing filled with a cryogenic fluid, an intermediate support in which a shaft is installed, intended for fastening the test specimen, a shaft rotation drive, a countershaft holder, a dynamometer and a loading mechanism associated with the countershaft holder (1}. However, this machine does not provide high accuracy.

A rise of the invention is ³ shenie accuracy test.

This goal is achieved by the fact that the proposed friction machine is equipped with a friction torque meter, made in the form of a lever, one end of which is connected to the counterpiece sample holder, and the second end is connected to a dynamometer, and a collection of IZNO-25 · products covering the sample and counterpiece.

FIG. 1 shows the proposed machine, the cross-section / in FIG. 2 - the same, longitudinal section ^ zd

2

in fig. 3 - kinematic scheme of the friction unit.

The friction machine contains an annular sample 1 mounted on the shaft 2, which is mounted in bearings 3 of the friction assembly. The rotation of the shaft 2 receives from the motor 4 through the gear 5, the rod 6 and the worm pair 7 of the friction node. The friction unit is fixed on the flange 8 of the cryostat using long thin-walled struts 9 and is fixed relative to the cryostat body by pins 10. On the intermediate support 11 of the friction assembly on bearings 12 a measuring rod 13 is installed coaxially with the shaft 2. The measuring rod 13 is equipped with a lever 14, which is connected by a rod 15 through hinges with a dynamometer measuring friction. The stationary counterbrack 17 in the form of a pad sliding along an annular rotating sample is fixed in the swing arm 18. The sample 17 is pressed against the lateral surface of the sample 1 with a calibrated spring 19, which is installed between the swing arm 18 and the pressure bolt 20. The swing arm 18 is set to 3

756271

four

The measuring rod 13 on the bearings 21 and through the pusher 22 and the roller 23 is connected by a pitch 24 with a displacement sensor 25, which is located on the flange 8 of the cryostat. A collection of 2 wear products made of ’is placed around the rotating sample.

fine metal mesh.

The machine works as follows.

A rotating sample 1 is mounted on the shaft 2, and a fixed counterpiece 17 is rotated into the swinging lever 18. The required force of the counterbeater 17 against the annular sample 1 is provided by compressing the calibrated spring 19 with a pressure bolt 20, 15

which can rotate with the help of pipe 27 with a limb located on the flange 8 of the cryostat. After installing the samples, the friction zone is closed by a collection of wear products 26 and the cryostat 20 is filled with a cryogenic liquid, in particular with liquid helium. The speed of rotation of sample 1 can be changed using the gear 5.

The friction force tends to turn 25 through the swing arm 18 measuring rod 13, which prevents the elastic dynamometer 16, associated with the rod 13 of the rod 15 and measuring the friction force.

The wear of the samples is compensated by turning the swinging lever 18, and since its angles of rotation are small, the force developed by the calibrated spring 19 remains almost unchanged, ensuring high metrological qualities of the installation.

The linear movement of the counterpiece as they wear out is fixed with the help of the sensor .25 movements, which is connected to the sample 17 through the pusher 22, the roller 23 and the thrust 24. The sample wear products are collected in the collector 26, which provides cryogenic fluid access to the friction zone and prevents the wear products from entering in bearings and worm gear friction unit.

Claims (1)

Claim A friction machine, comprising a housing filled with cryogenic fluid, an intermediate support in which a shaft is installed for fixing the test specimen, a shaft rotational drive, a counterpiece, a dynamometer and a loading mechanism associated with the counterpiece, which is different in that tests, it is equipped with a friction torque meter, made in the form of a lever, one end of which is connected to the holder of the counterpiece, and the second to the dynamometer, and a collection of wear products, covering specimen and countersample.