RELIEF DEVICE OF OIL CIRCUIT OF ENGINE

• US 20170114682A1
• Filed: 06/23/2015
• Published: 04/27/2017
• Est. Priority Date: 06/30/2014
• Status: Active Grant

• Current Assignee: Yamada Manufacturing Company Limited (Fujimak Corporation)
• Original Assignee: Yamada Manufacturing Company Limited (Fujimak Corporation)
• Inventors: KATO, Yuya, MIYAJIMA, Junichi, WATANABE, Takatoshi
• Granted Patent: US 10,641,143 B2
• Time in Patent Office: Days
• CPC Class Codes: F01M 1/02 using lubricating pumps pumps in general F04; lubricating pumps per se F16N
• 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: F01M 2001/0238 Rotary pumps
• CPC Class Codes: F04C 14/26 using bypass channels
• CPC Class Codes: F04C 2/102 the two members rotating simultaneously around their respective axes
• CPC Class Codes: F04C 2240/81 Sensor, e.g. electronic sensor for control or monitoring
• CPC Class Codes: F04C 2270/18 Pressure
• CPC Class Codes: F04C 2270/19 Temperature
• CPC Class Codes: F04C 2270/86 Detection

Abstract

[Problem] To provide a relief device for an oil circuit of an engine provided with an oil pressure relief valve and a temperature-sensitive relief valve, with which it is possible for oil to be relieved (expelled) at the intended pressure regardless of the oil temperature, and with which it is possible to simplify the configuration. [Solution] The relief device comprises an oil pump (9), an upstream channel (61) provided from a discharge side of the oil pump (9) to an engine (E), an oil pressure relief valve (A) for relieving oil due to the valve body being moved by oil pressure, and a temperature-sensitive relief valve (B) for relieving oil by sensing the oil temperature and continuously opening and closing. The oil pressure relief valve (A) and the temperature-sensitive relief valve (B) are arranged in parallel in the upstream channel (61).

Claims

1. A relief device of an oil circuit of an engine comprising:

an oil pump;

an upstream flow path that is provided from a side of a discharge portion of the oil pump to an engine;

an oil pressure relief valve that performs oil relief with movement of a valve body by pressure of oil; and

a temperature-sensitive relief valve that performs the oil relief by sensing an oil temperature of the oil and opening and closing steplessly, wherein

the oil pressure relief valve and the temperature-sensitive relief valve are disposed in parallel in the upstream flow path.

2. The relief device of an oil circuit of an engine according to claim 1, wherein

the temperature-sensitive relief valve performs the oil relief when the oil has a low oil temperature.

3. The relief device of an oil circuit of an engine according to claim 1, wherein

the temperature-sensitive relief valve performs the oil relief such that an amount of the oil relief is increased in the vicinity of a low oil temperature and is reduced in the vicinity of a high oil temperature when the oil has a middle oil temperature.

4. The relief device of an oil circuit of an engine according to claim 1, wherein

the temperature-sensitive relief valve does not perform the oil relief when the oil has a high oil temperature.

5. The relief device of an oil circuit of an engine according to claim 1, wherein

the temperature-sensitive relief valve is provided in the engine.

6. The relief device of an oil circuit of an engine according to claim 1, wherein

the temperature-sensitive relief valve includes a temperature-sensitive valve body and a temperature-sensitive housing,

the temperature-sensitive valve body includes a temperature-sensitive drive portion and a temperature-sensitive valve portion,

the temperature-sensitive valve portion has an inflow hole,

the temperature-sensitive drive portion has a piston that extends and retracts in response to an oil temperature detected with thermowax,

a second relief outflow portion is formed in an inner peripheral side surface of the temperature-sensitive housing, and

the temperature-sensitive valve portion is capable of opening and closing the second relief outflow portion by sliding.

7. The relief device of an oil circuit of an engine according to claim 6, wherein

the inflow hole of the temperature-sensitive valve portion is configured so as not to intersect an outer periphery of a top portion of the temperature-sensitive valve portion, and

the inflow hole is configured so as to be smaller in opening area than the second relief outflow portion.

8. The relief device of an oil circuit of an engine according to claim 1, wherein

a protruding portion that concentrates a flow of the oil at a temperature-sensitive drive portion of the temperature-sensitive relief valve is formed so as to bulge at a position in the discharge portion in the vicinity of an upstream side of the temperature-sensitive relief valve.

9. The relief device of an oil circuit of an engine according to claim 8, wherein

the protruding portion is formed into a gently inclined shape on an upstream side.