Variable displacement swash plate type compressor

Patent metadata

Field	Value
Publication number	US-9551336-B2
Application number	US-201414564305-A
Country	US
Kind code	B2
Filing date	Dec 9, 2014
Priority date	Dec 11, 2013
Publication date	Jan 24, 2017
Grant date	Jan 24, 2017

Abstract

In a compressor that changes a discharge capacity by using an actuator, a variable displacement swash plate type compressor capable of realizing reduction in manufacture cost is provided.
In the compressor of the present invention, a ring groove is formed in a movable body, and the ring groove is provided with an annular member. The annular member has a joint gap formed by a first to a third cutouts, and the third cutout is an aperture. In this compressor, the annular member moves in the ring groove based on a pressure difference between a control pressure chamber and a swash plate chamber. Thereby, in the compressor, a pressure in the control pressure chamber is regulated by regulating a flow of a refrigerant that flows to the swash plate chamber from the control pressure chamber.

First claim

The invention claimed is:

1. A variable displacement swash plate type compressor comprising a housing in which a suction chamber, a discharge chamber, a swash plate chamber and a cylinder bore are formed, a drive shaft that is rotatably supported by the housing, a swash plate rotatable in the swash plate chamber by rotation of the drive shaft, a link mechanism that is provided between the drive shaft and the swash plate, and allows change of an inclination angle of the swash plate to a direction orthogonal to a rotational axis of the drive shaft, a piston that is accommodated in the cylinder bore to be capable of reciprocating, a conversion mechanism that causes the piston to reciprocate in the cylinder bore at a stroke corresponding to the inclination angle by rotation of the swash plate, an actuator capable of changing the inclination angle, and a control mechanism that controls the actuator,
wherein the swash plate chamber communicates with the suction chamber,
the actuator has a stationary body fixed to the drive shaft in the swash plate chamber, a movable body movable in a direction of the rotational axis in the swash plate chamber, and a control pressure chamber defined by the stationary body and the movable body,
the control mechanism has a supply passage that communicates with the discharge chamber and the control pressure chamber, and introduces a refrigerant in the discharge chamber to the control pressure chamber, and a bleed passage that communicates with the swash plate chamber and the control pressure chamber, and discharges the refrigerant in the control pressure chamber to the swash plate chamber,
the bleed passage is provided at least one of a space between the movable body and the drive shaft and a space between the movable body and the stationary body,
the bleed passage is provided with an annular member having an aperture that always allows the control pressure chamber and the swash plate chamber to communicate with each other, and
the annular member regulates a flow of the refrigerant that flows through the bleed passage by moving in the bleed passage based on a pressure difference between the control pressure chamber and the swash plate chamber.

2. The variable displacement swash plate type compressor according to claim 1 ,
wherein the bleed passage has a concave stripe portion formed between the movable body and the stationary body or between the movable body and the drive shaft, and
the annular member is disposed in the concave stripe portion.

3. The variable displacement swash plate type compressor according to claim 1 ,
wherein the annular member has a first cutout that extends in an axial direction parallel with the rotational axis, a second cutout that extends in the axial direction in an extending direction of the first cutout while deviating in a circumferential direction orthogonal to the axial direction with respect to the first cutout, and a third cutout that extends in the circumferential direction and connects the first cutout and the second cutout, and
the third cutout is the aperture.

4. The variable displacement swash plate type compressor according to claim 1 ,
wherein the movable body is slidably provided on the drive shaft,
the movable body has, around the drive shaft, a first cylinder portion disposed at the swash plate side, a second cylinder portion that has a diameter enlarged more than the first cylinder portion, and a connection portion that connects the first cylinder portion and the second cylinder portion,
the stationary body has a cylinder chamber that accommodates the second cylinder portion while configuring the control pressure chamber, and
the annular member is provided between an outer circumferential surface of the second cylinder portion and an inner circumferential surface of the cylinder chamber.

5. The variable displacement swash plate type compressor according to claim 4 ,
wherein in the housing, a pressure regulation chamber that communicates with the control pressure chamber, and a shaft hole that allows the swash plate chamber and the pressure regulation chamber to communicate with each other, and allows the drive shaft to be rotatably inserted therethrough are formed, and
sealing members are provided between the drive shaft and the shaft hole, and between the first cylinder portion and the drive shaft.

Assignees

• Toyota Jidoshokki Kk

Inventors

• Nakaima Hiroyuki
• Yamamoto Shinya
• Sakakibara Kengo
• Yamazaki Yusuke
• Suzuki Takahiro

Classifications

• F04B27/086 Primary

  swash plate · CPC title

• F04B27/1804

  Controlled by crankcase pressure · CPC title

• F04B27/1072

  Pivot mechanisms · CPC title

• F04B1/295

  by changing the inclination of the swash plate · CPC title

• F04B2027/1859

  Suction pressure · CPC title