JPH03115785A - Bush for compressor - Google Patents

Abstract

PURPOSE:To restrain attack performance and self-abrasion to be caused by friction by compounding the copper group alloy powder, carbon fiber and molybdenum disulfide in a fluorocarbon member. CONSTITUTION:Fluorocarbon resin is used as the base resin, and while molybdenum disulfide is added to the base resin besides carbon fiber known with the effect for improving the strength of the self member and reducing a coefficient of friction and the copper group alloy powder known with the effect for restraining attack performance to give the damage to the objective member to form the three compound blending for enduring the friction for a long time and giving the stability against the abrasion. At least more than 30wt% of ethylene resin tetrafluoride as fluorocarbon resin is necessary against 100wt% of the whole of the material for material formation. Since the friction and the frictional stability is eliminated when it exceeds 93wt%, the desirable blending quantity of ethylene resin tetrafluoride is 30 - 93wt%.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a bushing for a compressor.

(Prior Art) The composition of a bushing for a conventional compressor is disclosed in JP-A-58-72770. The bushing disclosed here uses a fluororesin as a base resin, blends a copper-based or iron-based alloy and carbon fiber, and is intended to suppress attack and self-wear of the piston cylinder.

(Problems to be Solved by the Invention) The results of a friction and wear test performed on a fluororesin containing a copper-based alloy and carbon fiber among the above-mentioned compounded materials are shown as Conventional Example 1 in Tables 1 to 3.

From these results, it can be seen that the friction characteristics of the formulation according to the above-mentioned publication show that self-wear progresses rapidly and the aggressiveness of damaging the mating member is also high. Therefore, if used for a long time, the seal between the inner wall of the cylinder and the piston, which functions as a bushing, cannot be ensured, resulting in a reduction in the compression function.

Further, the results of a friction and wear test conducted using a fluororesin containing only carbon fibers are shown as Conventional Example 2 in Tables 1 to 3. Comparing Conventional Example 1 and Conventional Example 2, there is no significant improvement in effect due to the addition of the copper-based alloy.

The technical objective of the present invention is to suppress aggressiveness due to friction and self-wear by improving the compounding material of a bushing for a compressor.

(Structure of the invention) (Means for solving the problem) The means taken to solve the problem is to use fluororesin as a base resin, add a copper alloy and carbon fiber,
After studying various fillers, we decided to combine a three-component filler that also added molybdenum disulfide.

(Function) The present invention uses a fluororesin as the base resin, and uses carbon fiber, which is known to improve the strength of its own parts and lower the coefficient of friction, and carbon fiber, which is known to have the effect of suppressing the aggressiveness of damaging other parts. In addition to the copper-based alloy powder, molybdenum disulfide is added to create a three-component formulation that can withstand long-term friction and provides stability against wear.

Furthermore, it is known that tetrafluoroethylene resin, which is a fluororesin, is required to have a content of at least 30 wt % when the entire raw material is 100 wt % in order to form the material. It is also known that friction and wear stability are lost when the content exceeds 93 wt%.

Therefore, the preferred amount of tetrafluoroethylene resin is 30
It is considered to be -1% or more and 93wt% or more.

(Examples) The present invention will be explained in more detail below using examples. FIG. 1 shows the formulations of Examples of the present invention, Comparative Examples, and Conventional Examples. As the fluorine-based resin, tetrafluoroethylene resin, which has conventionally been used as a base resin for bushes, was used, and as the copper-based alloy powder, bronze powder was used.

Table 1 Material composition "Example 11 Carbon fiber (diameter 12.5μ) in tetrafluoroethylene resin
8 wt% of copper-based alloy powder (component Cu: 5n=9:1) and 8-1% of bronze powder (component Cu: 5n=9:1).
Friction and wear tests were conducted on a test piece using a bushing material containing 6 wt% of molybdenum disulfide (particle size: 5 μm).

The friction and wear tests were a lead powder type friction and wear test described below and a compressor bush wear test using a vertical reciprocating sliding test.

These test methods and conditions will be explained. Figures 1 and 2 show schematic diagrams of the lead dust friction and wear test.

A test piece 1 with a 5W square cross section and the same height is attached to the jig 3 at four locations. A load 4 above the jig 3 is applied so that the surface pressure of the test piece is kept constant at 7.0 Kgf/am'', and the alumite 2 which is the mating member is
The loading jig 5 to which the was attached was slid and rotated at a speed of 84 m/min for 5 hours. The alumite 2 used as the mating member had a surface roughness of 1.6 μRz and a hardness of Hv 400. The environmental conditions were a temperature of 25° C. and a humidity of 60% RH.

Next, a schematic diagram of the vertical reciprocating sliding test machine is shown in Figs. 3 and 4. The arc-shaped cylinder 6 and the piston 7 that almost engages with the cylinder 6 are made of alumite. This alumite used had a surface roughness of 0.6 μRz and a hardness of 1v400.

A test piece 8 that engages with the cylinder 6 is embedded, a load 9 is applied in the direction of the cylinder 6 so that the surface pressure of the test piece is kept constant at 7.0 Kgf/cm, and the piston 7 is stroked up and down. 40mm, rotation speed 5
Perform reciprocating motion at 0 rpm. The environmental conditions were the same as the lead powder type friction and wear test, at a temperature of 25°C and a humidity of 60% R)I.

Through the above two types of tests, the friction coefficient and wear coefficient are determined.
SEM observation of the bushing material and the alumite surface and measurement of the alumite surface roughness were performed.

As for the test results, Table 2 shows the results of the lead dust type friction and wear test, and Table 3 shows the results of the vertical reciprocating sliding test.

Table 2 Lead dust friction and wear test results (note) The unit of wear coefficient is cd,min kgf, m, h, 10' It is.

Table 3 Vertical friction and wear test results (note) The unit of wear coefficient is cla,min kgf, m, h, 10' It is.

r Example 21 Carbon fiber (diameter 20.0 g
ts, length 100 μm) at 25 wt%, and bronze powder (component Cu: 5n = 9:1) as KBr alloy powder.
) and 25 wt% of molybdenum disulfide (particle size 5 μm).
A friction and wear test was conducted on a test piece using a bushing material containing 3ivt% of .

The test method and test conditions were the same as in Example 1, and the test results are shown in Tables 2 and 3.

“Example 3J Carbon fiber (diameter 5.0 μm
, length 150 μm) was 6eyt%, and bronze powder (component Cu: 5n = 9:1) was 40w1 as copper-based alloy powder.
% and 6 wt % of molybdenum disulfide (particle size 5 μsI) was used on a test piece using a test piece using a bushing material.

The test method and test conditions were the same as in Example 1, and the test results are shown in Tables 2 and 3.

r Example 41 Carbon fiber (diameter 12, 5μ
m, length 100 μm) was 30 wt%, and bronze powder (component Cu: 5n = 9:1) was 5 wt% as copper-based alloy powder.
% and 12 wt % of molybdenum disulfide (particle size: 5 μm). A friction and wear test was conducted on a test piece using a bushing material.

The test method and test conditions were the same as in Example 1, and the test results are shown in Tables 2 and 3.

r Comparative Example IJ Carbon fiber (diameter 12.5μ
m, length 100 μm) was 40 t%, and bronze powder (component Cu: 5n-9: 1) was 5wt% as copper-based alloy powder.
% and 3 wt % of molybdenum disulfide (particle size: 5 μm). A friction and wear test was conducted on a test piece using a bushing material.

The test method and test conditions were the same as in Example 1, and the test results are shown in Tables 2 and 3.

rComparative Example 21 Carbon fiber (diameter 12.5H
tm, length 100μ111) to 2smt%, IL'%
Bronze powder (component Cu: 5n=9:1
) and 55 wt% of molybdenum disulfide (particle size 5 μm).
A friction and wear test was conducted on a test piece using a bushing material containing 3 and 4 t% of .

The test method and test conditions were the same as in Example 1, and the test results are shown in Tables 2 and 3.

r Comparative Example 31 Carbon fiber (diameter 12.5μ
2 wt% of bronze powder (component Cu: 5n=9:1) as copper-based alloy powder,
A friction and wear test was conducted on a test piece using a bushing material containing 2 wt% of molybdenum disulfide (particle size: 5 μm).

The test method and test conditions were the same as in Example 1, and the test results are shown in Tables 2 and 3.

r Conventional example IJ Carbon fiber (diameter 12.5μ
15 wt% of copper-based alloy powder (component Cu: 5n=9:1)
A friction and wear test was conducted on a test piece using a bushing material containing wt%.

The test method and test conditions were the same as in Example 1, and the test results are shown in Tables 2 and 3.

r Conventional Example 21 Carbon fiber (diameter 12.5μ
A friction and wear test was conducted using a test piece using a bushing material containing 15 wt% of 100 μm (rolled length: 100 μm).

The test method and test conditions were the same as in Example 1, and the test results are shown in Tables 2 and 3.

〔Effect of the invention〕

From the results of the lead dust friction and wear test and the vertical reciprocating sliding test results on test pieces using bushing materials with the above-mentioned compounding conditions, the bushing material composition of the present invention has a wear coefficient that is one-third that of the conventional one. The self-wear property was improved. Additionally, the surface roughness of the alumite after the test showed that the opponent's aggressiveness decreased. Therefore, even if used for a long time, the seal between the inner wall of the cylinder and the piston, which functions as a bushing, can be ensured, and the compression function will not be affected.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 shows a schematic diagram of a lead dust type friction and wear tester used in an embodiment of the present invention, FIG. 2 shows a sectional view taken along line A-A in FIG. The figure shows a schematic diagram of a vertical reciprocating sliding test machine used in an embodiment of the present invention, and FIG. 4 shows a sectional view taken along the line BB in FIG. 3. 1... Test piece (for precious wood type friction and wear test), 2...
...Alumite, 3...Test jig, 4...Load,
5... Load jig, 6... Cylinder, 7... Piston, 8... Test piece (for N type reciprocating sliding test),
9...Load.

Claims (4)

[Claims] (1) A bush for a compressor characterized by blending a fluorine-based material with copper-based alloy powder, carbon fiber, and molybdenum disulfide. (2) 3 to 50 wt% of copper alloy powder and 3 to 50 wt% of carbon fiber
The bush for a compressor according to claim 1, wherein the compressor bush contains 35 wt% of molybdenum disulfide. (3) The bush for a compressor according to claim (2), which contains 1 to 15 wt% of molybdenum disulfide. (4) The bush for a compressor according to claim (3), wherein the sum of the blended amounts of copper alloy powder, carbon fiber, and molybdenum disulfide is 70 wt% or less.