JP2000145625A - Swash plate compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a swash plate compressor which can sufficiently secure lubricity of a shoe even when vibration is applied to a compressor body from the outside and lubricating oil is hardly supplied to a sliding surface of the shoe, and can form a solid lubricant layer on the sliding surface with satisfactory adhesiveness. SOLUTION: In this type of compressor, a number of pores are formed on whole of the surface of a shoe 10 by etching for improving lubricity of the shoe 10 arranged between a piston on a cylinder bore of a cylinder block and a sliding surface of a swash plate. Trapping effect, that is, constraining performance of lubricating oil supplied from the outside of a crank chamber in the pores is improved. The pores on the surface of the main body of the shoe 10 is coated by a solid lubricant film 11 including solid lubricant which impregnates into the pores and is strongly adhered thereto. In the case that the lubricating oil is not supplied from the outside of the crank chamber, the pores are filled with the solid lubricant for bringing about self-lubricity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mainly used for an air conditioner for a vehicle, and has a self-lubricating property for a shoe interposed between a piston provided in a cylinder bore of a cylinder block and a sliding surface of a swash plate. The present invention relates to a swash plate type compressor.

[0002]

2. Description of the Related Art Conventionally, in this type of swash plate type compressor,
A well-known technique for improving the lubricity of a shoe is, for example, a swash plate type compressor (compressor) disclosed in Japanese Patent Application Laid-Open No. 60-26188.

In this swash plate type compressor (not shown), a (drive) shaft extending in one axis direction is inclined in a crank chamber formed by a front block and a cylinder block provided with a plurality of cylinder bores in parallel with one axis direction. The swash plate is fitted in the through hole of the plate, and a hemispherical shoe interposed between the piston slidably fitted in the plurality of cylinder bores and the sliding surface of the swash plate. The basic configuration is such that the piston reciprocates in a uniaxial direction by the rotation of.
The shoe here has a spherical sliding contact surface that slides on the piston and a substantially flat sliding contact surface that slides on the sliding surface of the swash plate.

In the case of the shoe of this swash plate type compressor, a bottomed central hole for an oil reservoir is provided at the center of the spherical sliding surface, and
By providing a ring-shaped groove around the center hole or a groove extending outward from the center hole, and further forming a solid lubricant layer containing solid lubricant on the spherical sliding surface, the swash plate type compressor is severe. Even if the lubricating oil is not supplied to the shoe from outside the crank chamber, such as when starting for a long time under unfavorable conditions or when starting, ensure that a certain amount of lubricant is supplied between the swash plate and the shoe. This makes it possible to prevent the occurrence of trouble during printing.

[0005]

In the case of the above-mentioned shoe of the swash plate type compressor, a bottomed central hole for an oil reservoir is basically provided at the center of the spherical sliding contact surface, and a ring-like shape is formed around the central hole. The swash plate compressor can be used under severe conditions by providing grooves extending outward from the center hole or the central hole, or by forming a solid lubricant layer containing solid lubricant on the spherical sliding surface. Even when the lubricating oil is not supplied to the shoe from outside or inside the crank chamber, the lubrication between the swash plate and the shoe has a certain degree of lubrication. The lubricating oil accumulated in the compressor body is ejected from the central hole by vibration applied from the outside to the compressor main body (particularly, it is an unavoidable matter in the case of a swash plate type compressor mounted on an air conditioner for a vehicle). Solid lubricant layer due to the presence of It is liable to collapse without being attached with good formed Josuri contact surface.

Further, under these conditions, the gas is reduced, the lubricating oil supplied from outside and inside the crank chamber to the shoe is reduced, or the lubricating oil is brought into contact with the sliding surface of the shoe when the liquid refrigerant is compressed. If the supply of
Since the lubricity of the shoe is reduced and the load becomes high, the shoe is likely to be worn and its durability is likely to be deteriorated, and the compression operation may not be performed smoothly.

SUMMARY OF THE INVENTION The present invention has been made to solve such problems, and the technical problem thereof is that the compressor body is subjected to external vibration and the lubricating oil is applied to the sliding surface of the shoe. An object of the present invention is to provide a swash plate compressor in which shoe lubrication is sufficiently ensured even in a situation where supply is extremely small.

Another technical object of the present invention is to provide a swash plate type compressor capable of forming a solid lubricant film on a sliding surface of a shoe with good adhesion.

[0009]

According to the present invention, in a swash plate type compressor having a shoe interposed between a piston provided in a cylinder bore of a cylinder block and a sliding surface of a swash plate, the shoe comprises: By the etching process, a swash plate compressor having a large number of fine holes provided on the surface of the main body including at least the sliding surfaces of the piston and the swash plate with respect to the sliding surfaces is obtained.

Further, according to the present invention, in the swash plate type compressor, the swash plate type compressor has a solid lubricant film coated with a large number of fine holes on the surface of the main body and containing a solid lubricant. Is obtained.

According to the present invention, on the other hand, a large number of fine holes are provided on the surface of the main body including at least a sliding surface with respect to the sliding surfaces of the piston and the swash plate by etching, and the large number of fine holes on the surface of the main body are formed. Swash plate type compressor shoe which has a solid lubricant film coated so as to cover the fine holes, and further contains the solid lubricant film.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The swash plate type compressor of the present invention will be described in detail below with reference to the drawings.

A swash plate type compressor according to the present invention is, similarly to the conventional type shown schematically, a uniaxial cylinder housing having a cylinder block provided with a plurality of cylinder bores and a front housing. (Drive) shaft is inserted into the through hole of the swash plate, and is interposed between the piston slidably fitted in the plurality of cylinder bores and the sliding surface of the swash plate. The designed hemispherical shoe has a basic structure in which a piston reciprocates in a uniaxial direction by rotation of a swash plate, and the structure of the shoe is improved so as to enhance lubricity as described below.

FIG. 1 is a side view showing a shoe 10 which is a main part of a swash plate type compressor according to one embodiment of the present invention. FIG. b) relates to the state after the etching process.

Referring to FIG. 1 (a), the shoe 10 in this case also has an existing surface having a surface in sliding contact with the piston and a substantially flat sliding surface in sliding contact with the sliding surface of the swash plate before the etching process. Although the structure is the same as that of FIG. 1B, in the state after the etching, the entire surface of the main body (at least the sliding surface of the piston and the swash plate) is etched by an acid, an alkali, an electrolysis, or the like. (Including the sliding surface against)
Are provided with a large number of fine holes 10a.

The fine hole 10a is a central hole provided mechanically at the center of the spherical sliding surface of the shoe as described in the background art, or a ring-shaped groove provided therearound. Or, unlike the groove extending outward from the central hole, the surface is uniformly and finely dispersed without forming a convex portion on the entire surface layer of the shoe 10 by the etching process, and compared with the smooth surface shape before the etching process. Even in the same manner, it is smoothly provided as a substantially concave wedge. The large number of these fine holes 10a allow the lubricating oil to be supplied to the shoe 10 from outside and inside the crank chamber without generating extra collision or friction with the mating sliding member (the sliding surface of the piston or swash plate). The lubricating oil once accumulated in the many fine holes 10a does not fly out even if some vibration is applied to the compressor body from the outside because the trapping effect that makes it easy to bind the fine particles into the fine holes 10a is excellent. The state of being attached to the sliding contact surface is maintained.

Therefore, the shoe 10 having such a large number of fine holes 10a is in a state where the gas is reduced once the lubricating oil is accumulated in each of the fine holes 10a, the state where the lubricating oil supplied from the outside is reduced, and the like. Alternatively, the shoe 10 when the liquid refrigerant is compressed.
Even when the supply of lubricating oil to the sliding surface is extremely small, lubricity can be sufficiently maintained.

Even when lubricating oil is not supplied to the shoe 10 from outside the crank chamber temporarily, such as when starting the compressor, the surface (sliding contact surface) of the shoe 10 has sufficient lubricity. As shown in FIG. 2, a large number of fine holes 10 are formed on the surface of the body of the shoe 10 as shown in FIG.
The solid lubricant film 11 containing a solid lubricant such as molybdenum dioxide may be coated so as to cover a.

The solid lubricant film 11 has a large number of fine holes 1 formed on the surface of the body of the shoe 10 when the film is formed.
Due to the anchoring action of penetrating into and firmly adhering to the fine holes 10a due to the presence of 0a, the shoe 10 is formed in close contact with the entire surface of the shoe 10 with good adhesion.

Therefore, the shoe 10 in which the solid lubricant film 11 is coated on the surface provided with such a large number of micro holes 10a can be used even when lubricating oil is not supplied from outside and inside the crank chamber temporarily. Since the solid lubricant contained in the agent film 11 fills the surface and the inside of each fine hole 10a and has a self-lubricating property, the lubricating oil can be supplied to the sliding surface of the shoe 10 even when the amount thereof is extremely small. Lubricity can be sufficiently maintained, and more stable lubricity can be secured.

As described above, the shoe 1 having self-lubricating properties
In the compressor using the zero, the initial sliding on the sliding contact surface of the shoe 10 is easy to adapt, the friction and the driving horsepower are reduced, and the sliding heat of the shoe 10 is suppressed even during the high load operation of the compressor, and the durability is improved. Thus, the compression operation is constantly performed smoothly.

[0022]

As described above, according to the swash plate compressor of the present invention, the lubrication of the shoe interposed between the piston provided in the cylinder bore of the cylinder block and the sliding surface of the swash plate is improved. In order to improve the basic structure, a large number of concave fine smooth holes are formed by etching on the surface of the body including at least the sliding surface of the shoe with respect to the sliding surfaces of the piston and the swash plate. The lubrication is improved by enhancing the trapping effect that makes it easier to bind the lubricating oil supplied from each side into each fine hole, and the lubrication is improved. Lubricity can be sufficiently maintained even in a situation where the supply of lubricating oil to the surface is extremely small.

Further, even when lubricating oil is not supplied to the shoe from outside and inside the crank chamber temporarily, a solid lubricant is contained by covering a large number of fine holes on the surface of the main body of the shoe so as to provide sufficient lubrication. In a situation where the supply of lubricating oil to the sliding surface of the shoe is extremely small because the solid lubricant fills the surface and each micropore and has a self-lubricating property by adopting a configuration in which the solid lubricant film formed is coated. Nevertheless, lubrication can be sufficiently ensured regardless of this, and more stable lubrication can be ensured.

As a result, in the swash plate type compressor equipped with a shoe having self-lubricating properties, the initial sliding on the sliding surface of the shoe is easy to adjust, the friction and the driving horsepower are reduced, and even when the compressor operates under a high load. The sliding heat generation of the shoe is suppressed, the durability is improved, and the compression operation is constantly performed smoothly.

[Brief description of the drawings]

FIG. 1 is a side view showing a shoe which is a main part of a swash plate type compressor according to one embodiment of the present invention, in which (a) relates to a state before etching processing, and (b) relates to a state after etching processing. Things.

FIG. 2 is a side view showing a state in which the shoe shown in FIG. 1B is coated with a solid lubricant film.

[Explanation of symbols]

 Reference Signs List 10 shoe 10a micropore 11 solid lubricant film

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[Procedure amendment]

[Submission date] November 11, 1998 (1998.11.
11)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 2

[Correction method] Change

[Correction contents]

Claims (3)

[Claims] 1. A swash plate type compressor having a shoe interposed between a piston provided in a cylinder bore of a cylinder block and a sliding surface of a swash plate, the shoe is formed by etching at least the piston and the swash plate. A swash plate compressor, wherein a large number of fine holes are provided on the surface of a main body including a sliding surface with respect to a sliding surface of a plate. 2. The swash plate compressor according to claim 2, wherein
A swash plate type compressor having a solid lubricant film that covers the plurality of fine holes on the surface of the main body and contains a solid lubricant. 3. A large number of fine holes are provided on the surface of the main body including at least a sliding surface with respect to the sliding surfaces of the piston and the swash plate by etching, and the plurality of fine holes on the surface of the main body are covered. A shoe for a swash plate type compressor having a coated solid lubricant film, wherein the solid lubricant film further contains a solid lubricant.