Variable displacement swash plate compressor

Patent metadata

Field	Value
Publication number	US-10309382-B2
Application number	US-201515322302-A
Country	US
Kind code	B2
Filing date	Jun 26, 2015
Priority date	Jun 27, 2014
Publication date	Jun 4, 2019
Grant date	Jun 4, 2019

Abstract

A piston compressor may prevent excessive oil from accumulating in a crank chamber while securing the supply of oil to a swash plate. In a piston compressor in which an oil separation passage is formed in a shaft and a crank chamber communicates with a suction chamber through the oil separation passage, a supply passage opens at a region of a cylinder block opposed to a swash plate to allow a working fluid introduced from a discharge chamber into the crank chamber to be supplied to the swash plate and a bypass passage allowing the crank chamber to constantly communicate with the suction chamber is provided to prevent the accumulation of excessive oil in the crank chamber regardless of the operation condition. The bypass passage communicates with the crank chamber at a region positioned in the outer side of a rotation trajectory of the swash plate in the radial direction.

First claim

The invention claimed is:

1. A variable displacement swash plate compressor comprising:
a cylinder block in which a plurality of cylinder bores are formed;
a front housing assembled to a front side of the cylinder block to define a crank chamber;
a rear housing attached to a rear side of the cylinder block, in which a suction chamber and a discharge chamber are formed;
pistons arranged in respective cylinder bores of the cylinder block so as to reciprocate;
a shaft supported by the front housing and the cylinder block so as to rotate freely;
a swash plate rotating integrally with the shaft and attached to the shaft so that a tilt angle is variable; and
shoes interposed between a peripheral edge portion of the swash plate and the pistons so as to slide, converting a rotating motion of the swash plate into a reciprocating motion of the pistons,
wherein a supply passage allowing the discharge chamber to communicate with the crank chamber and a release passage allowing the crank chamber to communicate with the suction chamber are provided for controlling a pressure in the crank chamber to control the tilt angle of the swash plate with respect to the shaft,
wherein part of the release passage is formed by an oil separation passage formed in the shaft, wherein the oil separation passage is configured by including a shaft hole extended in an axial direction from a rear end to a front end of the shaft, and a side hole extended in a radial direction and communicating with the shaft hole as well as opening to the crank chamber,
wherein the supply passage is configured by including a through hole formed in the cylinder block so that the through hole opens at a region opposed to the swash plate,
wherein a bypass passage allowing the crank chamber to constantly communicate with the suction chamber is provided separately from the release passage,
wherein a region of the bypass passage communicating with the crank chamber is positioned in an outer side of a rotation trajectory of the swash plate in the radial direction, and
wherein the bypass passage communicates with the crank chamber by using part or whole of a bolt hole formed in the cylinder block for inserting a bolt which fastens the cylinder block to the housing in the axial direction.

2. The variable displacement swash plate compressor according to claim 1 , wherein a valve plate is provided between the cylinder block and the rear housing, and the release passage and the bypass passage respectively include orifice holes formed in the valve plate at regions communicating with the suction chamber.

3. The variable displacement swash plate compressor according to claim 1 , wherein the bypass passage is configured by including the bolt hole and a communication path opening at an inner peripheral surface of the bolt hole.

4. The variable displacement swash plate compressor according to claim 1 , wherein the bypass passage includes a first passage forming portion drilled obliquely upward from a lower part of the cylinder block on a side of the crank chamber between the cylinder bores, and a second passage forming portion drilled in approximately parallel to the shaft from an end surface of the cylinder block on an opposite side of the end surface opposed to the crank chamber and communicating with the first passage forming portion.

5. The variable displacement swash plate compressor according to claim 1 , wherein the bypass passage communicates with a lower part of the crank chamber.

6. The variable displacement swash plate compressor according to claim 1 , wherein an opening end of the bypass passage with respect to a center of an accommodation hole of the cylinder block is formed in a range of 0°±10° when a direction under the center of the hole which supports the shaft is prescribed as 0 (zero) degree.

7. The variable displacement swash plate compressor according to claim 1 , wherein an opening end of the bypass passage with respect to a center of an accommodation hole of the cylinder block is formed in a range of 45°±10° when a direction position under the center of the hole which supports the shaft is prescribed as 0 (zero) degree.

8. The variable displacement swash plate compressor according to claim 2 , wherein the bypass passage is configured by including the bolt hole and a communication path opening at an inner peripheral surface of the bolt hole.

9. The variable displacement swash plate compressor according to claim 2 , wherein the bypass passage includes a first passage forming portion drilled obliquely upward from a lower part of the cylinder block on the crank chamber side between the cylinder bores, and a second passage forming portion drilled in approximately parallel to the shaft from an end surface of the cylinder block on an opposite side of the end surface opposed to the crank chamber and communicating with the first passage forming portion.

10. The variable displacement swash plate compressor according to claim 2 , wherein the bypass passage communicates with a lower part of the crank chamber.

11. The variable displacement swash plate compressor according to claim 2 , wherein an opening end of the bypass passage with respect to a center of an accommodation hole of the cylinder block is formed in a range of 0°±10° when a direction under the center of the hole which supports the shaft is prescribed as 0 (zero) degree.

12. The variable displacement swash plate compressor according to claim 2 , wherein an opening end of the bypass passage with respect to a center of an accommodation hole of the cylinder block is formed in a range of 45°±10° when a direction under the center of the hole which supports the shaft is prescribed as 0 (zero) degree.

13. The variable displacement swash plate compressor according to claim 3 , wherein an opening end of the bypass passage with respect to a center of an accommodation hole of the cylinder block is formed in a range of 0°±10° when a direction under the center of the hole which supports the shaft is prescribed as 0 (zero) degree.

14. The variable displacement swash plate compressor according to claim 3 , wherein an opening end of the bypass passage with respect to a center of an accommodation hole of the cylinder block is formed in a range of 45°±10° when a direction under the center of the hole which supports the shaft is prescribed as 0 (zero) degree.

15. A variable displacement swash plate compressor comprising:
a cylinder block in which a plurality of cylinder bores are formed;
a front housing assembled to a front side of the cylinder block to define a crank chamber;
a rear housing attached to a rear side of the cylinder block, in which a suction chamber and a discharge chamber are formed;
pistons arranged in respective cylinder bores of the cylinder block so as to reciprocate;
a shaft supported by the front housing and the cylinder block so as to rotate freely;
a swash plate rotating integrally with the shaft and attached to the shaft so that a tilt angle is variable; and
shoes interposed between a peripheral edge portion of the swash plate and the pistons so as to slide, converting a rotating motion of the swash plate into a reciprocating motion of the pistons,
wherein a supply passage allowing the discharge chamber to communicate with the crank chamber and a release passage allowing the crank chamber to communicate with the suction chamber are provided for controlling a pressure in the crank chamber to control the tilt angle of the swash plate with respect to the shaft,
wherein part of the release passage is formed by an oil separation passage formed in the shaft, wherein the oil separation passage is config

Assignees

• Valeo Japan Co Ltd

Inventors

• Teraya Takanori
• Sakamoto Katsumi
• Watanabe Kazuto
• Kono Masayuki

Classifications

• F04B2027/1813

  Crankcase pressure · CPC title

• F04B27/1081

  Casings, housings · CPC title

• F04B2027/1827

  between crankcase and discharge chamber · CPC title

• F04B39/0207

  with lubrication control systems · CPC title

• F04B27/1045

  Cylinders · CPC title