Relief device for oil circuit of engine

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.

1 . A relief device for an oil circuit of an engine,
 the relief 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 relieving oil by a valve body moving due to oil pressure; and   a temperature-sensitive relief valve relieving 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, and a portion of a pump housing of the oil pump is formed in an integrated fashion with a casing of an oil circulation mechanism.   
     
     
         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 pump housing is configured by a housing main body section and a housing cover section, and the housing main body section is formed in an integrated fashion with the casing of the oil circulation mechanism. 
     
     
         6 . The relief device for an oil circuit of an engine according to  claim 1 , wherein the pump housing is configured by a housing main body section and a housing cover section, and the housing main cover section is formed in an integrated fashion with the casing of the oil circulation mechanism.