Swash plate type variable displacement compressor

Patent metadata

Field	Value
Publication number	US-9316217-B2
Application number	US-201314064864-A
Country	US
Kind code	B2
Filing date	Oct 28, 2013
Priority date	Nov 5, 2012
Publication date	Apr 19, 2016
Grant date	Apr 19, 2016

Abstract

In a compressor according to the present invention, an actuator is arranged in a swash plate chamber in a manner rotatable integrally with a drive shaft. The actuator includes a rotation body, a movable body, and a control pressure chamber. A control mechanism includes a bleed passage, a supply passage, and a control valve. The control mechanism is capable of changing the pressure in the control pressure chamber to move the movable body. When the pressure in the control pressure chamber exceeds the pressure in the swash plate chamber, the inclination angle of the swash plate with respect to the rotation axis of the drive shaft increases.

First claim

The invention claimed is:

1. A swash plate type variable displacement 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 rotationally supported by the housing;
a swash plate rotatable in the swash plate chamber by rotation of the drive shaft;
a link mechanism arranged between the drive shaft and the swash plate, the link mechanism allowing change of an inclination angle of the swash plate with respect to a line perpendicular to the rotation axis of the drive shaft;
a piston reciprocally received in the cylinder bore;
a conversion mechanism that causes the piston to reciprocate in the cylinder bore by a stroke corresponding to the inclination angle of the swash plate through rotation of the swash plate;
an actuator capable of changing the inclination angle of the swash plate; and
a control mechanism that controls the actuator,
wherein
the actuator is arranged in the swash plate chamber and rotates integrally with the drive shaft,
the actuator includes a rotation body fixed to the drive shaft, a movable body that is connected to the swash plate and movable relative to the rotation body in the direction of the rotation axis of the drive shaft, and a control pressure chamber that is defined by the rotation body and the movable body and moves the movable body using pressure in the control pressure chamber,
wherein the rotation body is slidably located within the movable body and the movable body is configured to move along the rotation axis of the drive shaft,
one of the suction chamber and the swash plate chamber is a low pressure chamber,
the control mechanism has a control passage through which the control pressure chamber communicates with the low pressure chamber and the discharge chamber and a control valve capable of adjusting the opening degree of the control passage,
at least a section of the control passage is formed in the drive shaft, and
the movable body is arranged such that the inclination angle of the swash plate is increased through a rise of the pressure in the control pressure chamber.

2. The compressor according to claim 1 , wherein
the movable body has an outer peripheral wall that surrounds the rotation body and the control pressure chamber, and
the outer peripheral wall has a point of application connected to the swash plate.

3. The compressor according to claim 1 , wherein the control passage formed in the drive shaft is configured by a axial passage extending in the drive shaft in the direction of the rotation axis and a radial passage communicating with the axial passage and extending radially in the drive shaft to communicate with the control pressure chamber.

4. The compressor according to claim 1 , wherein at least a portion of the inner peripheral surface of at least one of the rotation body and the movable body has a diameter becoming greater toward a sliding surface between the rotation body and the movable body.

5. The compressor according to claim 2 , wherein
the movable body has a flange extended radially from the rotation axis of the drive shaft and arranged around the drive shaft,
the outer peripheral wall of the movable body is formed integrally with the flange at the outer circumference of the flange and extends along the rotation axis of the drive shaft, and
the outer peripheral wall is movable along the rotation axis of the drive shaft relative to the outer circumference of the rotation body.

6. The compressor according to claim 1 , wherein
a pressure regulation chamber is formed in the control passage, and
the control valve lowers the pressure in the pressure regulation chamber by a decrease in thermal load.

7. The compressor according to claim 1 , wherein a radially central axis of the control pressure chamber coincides with the rotation axis of the drive shaft.

Assignees

• Toyota Jidoshokki Kk

Inventors

• Yamamoto Shinya
• Suzuki Takahiro
• Honda Kazunari
• Nishii Kei
• Yamazaki Yusuke
• Ota Masaki

Classifications

• F04B2027/1813

  Crankcase pressure · CPC title

• F04B27/1804 Primary

  Controlled by crankcase pressure · CPC title

• F04B27/18

  by varying the relative positions of a swash plate and a cylinder block · CPC title

• F04B27/1054

  Actuating elements · CPC title

• F04B27/1072

  Pivot mechanisms · CPC title