Expansible chamber devices – With lubricating means – Lubricant entrained by working fluid
Patent
1997-06-05
1998-10-06
Denion, Thomas E.
Expansible chamber devices
With lubricating means
Lubricant entrained by working fluid
92158, 92159, 184 617, 184 18, F01B 3100
Patent
active
058161341
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to piston type compressors that convert rotation of a rotary shaft to linear reciprocating movement of a piston with a driving body such as a swash plate.
2. Description of the Related Art
Compressors are used to air-condition passenger compartments in vehicles. Piston type compressors are typically used for such compressors. The piston type compressor has a driving body, such as a swash plate, for a reciprocating piston. The driving body is supported by a rotary shaft in a crank chamber and converts the rotation of the rotary shaft to the linear reciprocating movement of the piston in a cylinder bore. The reciprocating movement of the pistons draws refrigerant gas into the cylinder bore from a suction chamber, compresses the gas in the cylinder bore, and discharges the gas into a discharge chamber.
The typical piston type compressor draws the refrigerant gas from an external refrigerant circuit into a suction chamber by way of the crank chamber. In such a compressor, in which the crank chamber constitutes a portion of a refrigerant gas passage, the refrigerant gas passing through the crank chamber sufficiently lubricates various parts in the crank chamber, such as the piston and the driving body, with the lubricating oil suspended in the gas.
There is also a type of compressor that draws in refrigerant gas from an external refrigerant circuit without having the gas flow through its crank chamber. Japanese Unexamined Patent Publication 60-175783 discloses such a compressor. In such a compressor, in which the crank chamber does not constitute a portion of the refrigerant gas passage, the various parts in the crank chamber are lubricated mainly by lubricating oil that is included in blowby gas. Blowby gas refers to the refrigerant gas in the cylinder bore that leaks into the crank chamber through the space defined between the outer circumferential surface of the piston and the inner circumferential surface of the cylinder bore when the piston compresses the refrigerant gas in the cylinder bore.
The amount of blowby gas, or lubricating oil, supplied into the crank chamber is determined by the dimension of the clearance defined between the outer circumferential surface of the piston and the inner circumferential surface of the cylinder bore. Accordingly, it is necessary to increase the dimension of the clearance to supply a sufficient amount of lubricating oil to satisfactorily lubricate the various parts in the crank chamber. However, a large clearance between the piston and the cylinder bore degrades the compressing efficiency of the compressor.
To cope with this problem, compressors having a structure such as that shown in FIGS. 22 and 23 are known in the prior art. The compressor shown in FIG. 22 has a swash plate 124, which serves as a driving body and which is mounted on a rotary shaft (not shown) so as to rotate integrally with the shaft. Shoes 125 are arranged between the swash plate 124 and the rear portion of a single-headed piston 122. Each shoe 125 has a spheric surface, which is slidably engaged with a retaining recess 122a of the piston 122, and a flat surface, which slides on the front or rear surface of the swash plate 124. When the rotary shaft and the swash plate 124 rotate integrally, the swash plate 124 serves to reciprocate the piston 122 in a cylinder bore 123 by means of the shoes 125.
The compressor shown in FIG. 23 has a wobble plate 128, which is mounted on a rotary shaft (not shown) and which rotates relatively with respect to the shaft. Rotation of the rotary shaft causes oscillating movement of the wobble plate 128. A rod 129 has a spheric body 129a formed on both of its ends. Each spheric body 129a is slidably held in either a retaining recess 128a of the wobble plate 128 or a retaining recess 126a of a piston 126. Rotation of the rotary shaft oscillates the wobble plate 128. The oscillation is transmitted to the piston 126 through the rod 129 and reciprocates the piston 126 in a cylinder bore 127
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Hamaoka Takahiro
Hashimoto Mitsuru
Kawaguchi Masahiro
Kayukawa Hiroaki
Michiyuki Takashi
Denion Thomas E.
Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
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