RELIEF DEVICE FOR OIL CIRCUIT OF ENGINE

• US 20150377097A1
• Filed: 06/25/2015
• Published: 12/31/2015
• Est. Priority Date: 06/30/2014
• Status: Abandoned Application

• Current Assignee: Yamada Manufacturing Company Limited (Fujimak Corporation)
• Original Assignee: Yamada Manufacturing Company Limited (Fujimak Corporation)
• Inventors: MIYAJIMA, Junichi, WATANABE, Takatoshi, KATO, Yuya
• Application Number:
  US14/750,985
• Publication Number:
  US 20150377097A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F01M 1/16 Controlling lubricant pressure or quantity rendering machines or engines inoperative or idling on lubricant pressure failure F01M1/22

Abstract

A relief device including: an oil pump; an upstream flow passage provided from a discharge section side of the oil pump to an engine; an oil-pressure relief valve relieving oil by a valve body moving due to oil pressure; and a temperature-sensitive relief valve B relieving oil by detecting an oil temperature and opening and closing steplessly. The oil-pressure relief valve and the temperature-sensitive relief valve are disposed in parallel in the upstream flow passage. A portion of the pump housing of the oil pump is formed in an integrated fashion with a casing of an oil circulation mechanism. An oil filter 102 is provided in the upstream flow passage 61, and the temperature-sensitive relief valve B is positioned on the upstream side of the oil filter.

Claims

1. A relief device for an oil circuit of an engine,

the device comprising:

an oil pump;

an upstream flow passage provided from a discharge section side of the oil pump to an engine;

an oil-pressure relief valve which relieves oil by a valve body moving due to oil pressure; and

a temperature-sensitive relief valve which relieves oil by detecting an oil temperature and opening and closing steplessly, wherein

the oil-pressure relief valve and the temperature-sensitive relief valve are disposed in parallel arrangement in the upstream flow passage,

an oil filter is provided in the upstream flow passage, and

the temperature-sensitive relief valve is positioned on the upstream side of the oil filter.

2. The relief device for an oil circuit of an engine according to claim 1, wherein, when the oil temperature is low, the temperature-sensitive relief valve relieves oil.

3. The relief device for an oil circuit of an engine according to claim 1, wherein, when the oil temperature is medium, the amount of oil relieved by the temperature-sensitive relief valve becomes greater near a low oil temperature, and becomes smaller near a high oil temperature.

4. The relief device for an oil circuit of an engine according to claim 1, wherein, when the oil temperature is high, the temperature-sensitive relief valve does not relieve oil.

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

a relief flow passage branches from the upstream flow passage,

the oil-pressure relief valve and the temperature-sensitive relief valve are provided in a parallel arrangement in the relief flow passage, and

the branch section of the relief flow passage is positioned on the upstream side of the oil filter.