Displacement control valve for variable displacement compressor

• US 20080247883A1
• Filed: 08/09/2007
• Published: 10/09/2008
• Est. Priority Date: 08/10/2006
• Status: Abandoned Application

• Current Assignee: Kabushiki Kaisha Toyota Jidoshokki
• Original Assignee: Kabushiki Kaisha Toyota Jidoshokki
• Inventors: Okuda, Motoaki, Ueda, Hiromi, Suzuki, Junya, Yokomachi, Naoya
• Application Number:
  US11/891,514
• Publication Number:
  US 20080247883A1
• Time in Patent Office: Days
• US Class Current: 417/218
• CPC Class Codes: F04B 2027/1813 Crankcase pressure
• CPC Class Codes: F04B 2027/1827 between crankcase and discharge chamber
• CPC Class Codes: F04B 2027/185 Discharge pressure
• CPC Class Codes: F04B 2027/1854 External parameters
• CPC Class Codes: F04B 2205/05 Pressure after the pump outlet
• CPC Class Codes: F04B 2205/08 Pressure difference over a throttle
• CPC Class Codes: F04B 27/1804 Controlled by crankcase pressure

Abstract

A displacement control valve for a variable displacement compressor has a control passage, a valve hole formed in the control passage, a first shaft portion including a valve body, and a connecting portion connected to the end portion of the valve body. The control passage is connected to a crank chamber for controlling the pressure in the crank chamber for adjusting the discharge displacement of the compressor. The valve body is formed at an end portion of the first shaft portion to open and close the valve hole. The connecting portion connected to the end portion of the valve body is disposed into the valve hole, and a circumferential surface of the connecting portion has a curved surface so as to be flared out at an end of the connecting portion.

Claims

1. A displacement control valve for a variable displacement compressor that adjusts the discharge displacement by controlling the pressure in a crank chamber, the displacement control valve comprising:

a control passage connected to the crank chamber for controlling the pressure in the crank chamber;

a valve hole formed in the control passage;

a first shaft portion including a valve body at an end portion thereof to open and close the valve hole; and

a connecting portion connected to the end portion of the valve body, so that the connecting portion is disposed into the valve hole, wherein a circumferential surface of the connecting portion has a curved surface so as to be flared out at an end of the connecting portion adjacent to the valve body.

2. The displacement control valve for a variable displacement compressor according to claim 1, wherein the curved surface is formed with an arc.

3. The displacement control valve for a variable displacement compressor according to claim 1, wherein the curved surface is connected to a circumferential edge of the end portion of the valve body.

4. The displacement control valve for a variable displacement compressor according to claim 1, wherein a valve seat is formed around the valve hole, wherein the valve body has a plane end surface adjacent to the connecting portion, wherein the plane end surface of the valve body makes contact with the valve seat to close the valve hole.

5. The displacement control valve for a variable displacement compressor according to claim 1 further comprising a second shaft portion connected to the connecting portion.

6. The displacement control valve for a variable displacement compressor according to claim 5, wherein a diameter of an end of the connecting portion adjacent to the valve body is larger than a diameter of an end of the connecting portion adjacent to the second shaft portion.

7. The displacement control valve for a variable displacement compressor according to claim 5, wherein a step is formed by the connecting portion and the second shaft portion.

8. The displacement control valve for a variable displacement compressor according to claim 5 further comprising a pressure sensing mechanism for moving the valve body.

9. The displacement control valve for a variable displacement compressor according to claim 1 further comprising a solenoid for moving the valve body.