Expansible chamber devices – Displacement control of plural cylinders arranged in... – Parallel cylinders
Patent
1997-05-28
1999-03-02
Nguyen, Hoang
Expansible chamber devices
Displacement control of plural cylinders arranged in...
Parallel cylinders
92 57, 92 71, 417269, F01B 300
Patent
active
058757023
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a swash plate of a swash-plate type compressor and to a combination of a swash plate and shoes. More particularly, the present invention relates to a surface-treating technique for outstandingly improving, in a single-side compression--type swash-plate compressor, the sliding properties of a swash-plate which consists of an iron-based or aluminum-based material.
BACKGROUND TECHNIQUE
In the swash-plate type compressor, a swash-plate is rigidly secured obliquely to a rotary shaft or is secured obliquely to a rotary shaft in such a manner that its slanting angle is variable. The compression and expansion are carried out by means of rotating the swash-plate which increases or decreases the volume of a partition space within a compressor, depending upon the rotation of the rotary shaft. Such swash plate is caused to slide on a sliding member referred to as a shoe, and reciprocates a piston via the shoe. The cooling medium can therefore be compressed and expanded in the stated space.
A salient point in the sliding conditions of a swash-plate is that, during the initial operational period of a compressor, the cooling medium reaches the sliding part prior to the lubricating oil reaching the sliding part; thus the cooling medium has a rinsing effect on the lubricating oil which remains on the sliding part, with the result that the sliding condition is in a dry condition free of lubricating oil. The requirements for the sliding condition of the swash plate are therefore very severe.
The sliding properties, which are required for a swash-plate used under the condition described above, are seizure resistance, wear resistance, and the like. Proposals have thus been made to add hard matters into the aluminum material for enhancing the wear resistance, to improve the material of the swash plate, and to subject an iron-based swash-plate to heat treatment or surface treatment for enhancing the hardness and hence wear-resistance.
One of the present applicants proposed in Japanese Unexamined Patent Publication No. Sho 51-36611 to bond sintered Cu material on the shoe in the case of an iron-based swash plate. That is, an iron-based swash plate was heretofore subjected to hardening treatment. However, when the material of the opposed member, i.e., the shoe, is an iron-based material, the sliding takes place between identical kinds of materials thereby incurring a problem that a seizure is liable to occur. Sintered copper alloy is used for the opposing material (shoe) opposed to an iron-base swash plate, so as to avoid the above mentioned problem.
In addition, it was also proposed to apply tin plating on the iron-based swash-plate so as to avoid the sliding between identical kinds of materials and hence to enhance the seizure resistance.
In the ordinary swash-plate type compressor, the cooling medium is sucked into and compressed in the cylinder bores at both sides of a piston. In a recently produced single-side compression type swash-plate compressor, the compression and suction are carried out usually only in the rear (R) side. This swash plate compressor is described with reference to an example of the variable volume type compressor disclosed in Japanese Unexamined Patent Publication No. 6-288,347 filed by one of the applicants.
As shown in FIG. 13, the front housing 2 is secured to one side of the cylinder block 1, while the rear housing 3 is secured to the other side via the valve sheet 4. The driving shaft 6 is included in the crank space 5 formed by the cylinder block 1 and the front housing 2 and is rotatably supported by the bearings 7a and 7b. A plurality of the cylinder bores 9 are formed in the cylinder block 1 at a location where they surround the driving shaft 6. A piston 10 is inserted in each cylinder bore 9.
A rotor 16 is synchronous rotatably supported by the driving shaft 6 in the crank space. In addition, a sleeve 12 having a spherical surface is slidably supported by the driving shaft 6. A compression spring 13 is provided between the rotor 16 and the sl
REFERENCES:
patent: 4537632 (1985-08-01), Mosser
patent: 5630355 (1997-05-01), Ikeda et al.
patent: 5655432 (1997-08-01), Wilkosz et al.
Kawagoe Kimio
Sibata Makoto
Takenaka Kenji
Nguyen Hoang
Taiho Kogyo Co. Ltd.
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