Oil pump

• US 20060171818A1
• Filed: 01/23/2006
• Published: 08/03/2006
• Est. Priority Date: 02/01/2005
• Status: Abandoned Application

• Current Assignee: Aisin Seiki Co., Ltd. (Aisin Corp.)
• Original Assignee: Aisin Seiki Co., Ltd. (Aisin Corp.)
• Inventors: Kato, Hiroshi
• Application Number:
  US11/336,889
• Publication Number:
  US 20060171818A1
• Time in Patent Office: Days
• US Class Current: 417/302
• CPC Class Codes: F01M 1/16 Controlling lubricant pressure or quantity rendering machines or engines inoperative or idling on lubricant pressure failure F01M1/22
• CPC Class Codes: F04C 14/24 characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valvesF04C14/10 takes precedence
• CPC Class Codes: F04C 2/102 the two members rotating simultaneously around their respective axes
• CPC Class Codes: F04C 2270/18 Pressure
• CPC Class Codes: F04C 2270/58 Valve parameters
• CPC Class Codes: F05C 2251/042 Expansivity
• CPC Class Codes: F05C 2251/08 Shape memory

Abstract

An oil pump includes a first control valve including a first valve body provided in a first valve housing for reciprocating therein, the first valve body for controlling discharge pressure of working oil discharged from a pump main body, a first valve chamber formed in the first valve housing, the first valve chamber being applied with the discharge pressure of the working oil from the pump main body, and a second valve chamber formed in the first valve housing, the second valve chamber being supplied with the working oil, and a second control valve activated on the basis of degree of the temperature of the working oil, the second control valve for controlling oil pressure of the working oil flowed into the second valve chamber.

Claims

1. An oil pump comprising:

a first control valve including;

a first valve body provided in a first valve housing for reciprocating therein, the first valve body for controlling discharge pressure of working oil discharged from a pump main body on the basis of a position of the first valve body in the first valve housing;

a first valve chamber formed in the first valve housing at a first side of the first valve body, the first valve chamber being applied with the discharge pressure of the working oil from the pump main body; and

a second valve chamber formed in the first valve housing at a second side of the first valve body, the second valve chamber being supplied with the working oil; and

a second control valve activated on the basis of degree of the temperature of the working oil, the second control valve for controlling oil pressure of the working oil flowed into the second valve chamber.

2. The oil pump according to claim 1, wherein

the first control valve includes a biasing mechanism biasing the first valve body in a direction in which the first valve body is moved toward the first valve chamber, and the second control valve establishes the communication path between the second valve chamber and the first valve chamber in a condition where the temperature of the working oil satisfies a predetermined temperature condition.

3. The oil pump according to claim 1, wherein

the second control valve includes a second valve body reciprocating in a second valve housing and switching a control whether to establish or interrupt the communication path between the second valve chamber and the first valve chamber, and a valve body operating mechanism operating the second valve body by means of a heat-sensitive expanding and contracting member, which is expanded and contracted in a direction of a reciprocation of the second valve body on the basis of degree of the temperature of the working oil.

4. The oil pump according to claim 1, wherein

the valve body operating mechanism includes the heat-sensitive expanding and contracting member provided at a first side of the second valve body and an elastic member provided at a second side of the second valve body.

5. The oil pump according to claim 1, wherein

the heat-sensitive expanding and contracting member includes a shape memory alloy,

a thermostat wax, or a bimetal.