PL154208B2 - Measuring head for tribology tests - Google Patents

Description

REPUBLIC

POLAND

PATENT DESCRIPTION OF THE TEMPORARY PATENT

154 208

Provisional patent additional to the patent no. Applied for 89 06 20 (P. 280 138)

Priority Int. Cl. ⁵ G01N 3/56 ° nmau

OFFICE

PATENT

RP

Application announced: 90 04 02

Patent description published: 1991 10 31

Inventor: Czesław Kundera

Authorized by a provisional patent: Kielce University of Technology, Kielce (Poland)

MEASUREMENT HEAD 00 TRIBOLOGICAL TESTING

The subject of the invention is a measuring head designed to measure the moment of friction force and temperature in the contact zone of the tested frictional connection.

In the previously known design of the measuring head with similar research capabilities, covered by the Polish Patent No. 86345, the test medium is supplied to the friction zone under appropriate pressure through a flexible conduit, the tip of which is screwed to the head around its circumference. This solution introduces significant measurement errors, because the medium supply cable is twisted during the test. In addition, the head according to the patent No. 86345 is intended for installation in a suitable support, e.g. a turning tailstock, which significantly limits its use.

The measuring head for tribological tests, containing a spring clamping mechanism of the tested friction connection and a spring friction torque measuring system, according to the invention, has an outer sleeve in which an inner sleeve is slidably mounted, connected with an elastic element with the case of the tested sample, and the case is mounted on a hollow shaft in the inner sleeve. On the other side of the outer sleeve, a hollow bolt is mounted, cooperating with the nut, which presses the tested friction connection through the spring, the inner sleeve with the sample housing. There is a thrust bearing between the inner sleeve and the sample housing. The outer sleeve can be moved in relation to the support screwed to the test stand.

The tested medium is brought under appropriate pressure to the friction zone through a flexible conduit, the end of which is tightened along the axis of the hollow shaft. The construction of the head is a compact structure, reduces the measurement error of friction forces and allows easy access to temperature measurement in the friction zone.

154 208

154 208

The subject matter of the invention is explained in more detail in the drawing in which fig. 1 shows an axial section of the head, and fig. 2 shows the section A-A in fig.

The measuring head for tribological tests consists of two sleeves: outer 1 and inner 2, which can be moved relative to each other and in relation to the support 3 screwed to the test stand. A sample of the tested material, made in the shape of a ring 19, is fastened with three circumferentially spaced screws 18 in the housing 4, which is mounted on the hollow shaft 5, mounted in the inner sleeve 2. The housing 4 of the tested sample 19 is connected with the inner sleeve 2 through a spiral spring 10 The arrangement of the radial 13 and 14 thrust bearings enables the housing 4 to be deflected during the tests, proportional to the value of the frictional moment. The required pressure of the annular sample 19 against the rotating counter-sample 20 is provided by the spring 9 compressed by the nut 8 cooperating with the hollow screw 6, which is mounted in the outer sleeve 1 and screwed to it with covers 11 and 12.

The hollow shaft 5, mounted in the inner sleeve 2, has a threaded end for screwing the conduit supplying the tested medium under the desired pressure to the friction zone. The conduit is introduced through the hollow screw 6. The cover 7 protects against contamination the thrust bearing 14 and the spiral spring 10. The conical bearing 15 is secured by a sealing ring 16 embedded in the cover 11. The housing 4 has three circumferentially threaded radial holes for fixing screws 18 the test sample 19 and two openings for introducing thermocouples into the friction zone.

Claims (2)

Patent claims 1. Measuring head for tribological tests containing a spring mechanism loading the tested friction connection and a spring system for measuring the friction force, characterized by the fact that it has an outer sleeve (1) in which the inner sleeve (2) is slidably mounted and connected with the housing (4) of the tested sample (19) and a spiral spring (10), the hollow shaft (5) bearing in the inner sleeve (2) on which the casing (4) is mounted, and the hollow bolt (6) in said outer sleeve (1), which it works with the nut (8) pressing the inner sleeve (2) together with the housing (4) of the tested sample (19) to the rotating counter-sample (20), through the thrust bearing (14) and spring (9), and between the face of the inner sleeve (2) ) and the housing (4) houses the thrust bearing (14). Head according to claim 1, characterized in that a flexible conduit is attached to the hollow shaft (5) through the hollow bolt (6), which supplies the medium to the friction zone. 154 208 Fig et. 154 208 Department of Publishing of the UP RP. Circulation 100 copies Price: PLN 3,000