Fluid circuit of engine

Abstract

A fluid circuit of an engine fitted with a cooling circuit and an oil circuit, may include a water pump mounted on a coolant circulation line, a radiator that connected to a coolant exhaust line of the engine, a water temperature governor selectively connecting the radiator with the water pump to control a coolant flow therebetween, a first cooling line connecting the coolant exhaust line with a subsidiary unit, a first return line directly connecting the subsidiary unit with the water pump through the water temperature governor, a second cooling line connecting the first cooling line to a turbocharger to guide a part of a coolant supplied to the first cooling line to the turbocharger, and a second return line connecting the turbocharger with the first return line to guide a part of the coolant that is exhausted from the turbocharger to the first return line.

1 . A fluid circuit of an engine that is fitted with a cooling circuit and an oil circuit, comprising:
 a water pump that is mounted on a coolant circulation line;   a radiator that is connected to a coolant exhaust line of the engine;   a water temperature governor that selectively connects the radiator with the water pump to control a coolant flow therebetween;   a first cooling line that connects the coolant exhaust line with a subsidiary unit;   a first return line that directly connects the subsidiary unit with the water pump through the water temperature governor;   a second cooling line that connects the first cooling line to a turbocharger to guide a part of a coolant that is supplied to the first cooling line to the turbocharger; and   a second return line that connects the turbocharger with the first return line to guide a coolant that is exhausted from the turbocharger to the first return line.   
   
   
       2 . The fluid circuit of an engine of  claim 1 , wherein the oil circuit includes:
 a main oil line that is mounted in a cylinder block of the engine to receive oil from a hydraulic pump;   a first oil line that connects the turbocharger with the main oil line to guide the oil that is supplied from the main oil line to the turbocharger; and   a second oil line that guides oil that is returned from the turbocharger to the main oil line.   
   
   
       3 . The fluid circuit of an engine of  claim 1 , wherein the water temperature governor includes:
 a main line that connects the radiator and water pump and selectively supplies a coolant that is transmitted from the radiator to the water pump; and   a bypass line that is separately formed from the main line and directly connects the first return line to the water pump to guide a coolant that is returned from the first return line to the water pump,   wherein a main valve that is mounted in the main line and is opened or closed according to a temperature of the coolant that is transmitted from the radiator to control the coolant flow between the radiator and the water pump.   
   
   
       4 . The fluid circuit of an engine of  claim 3 , wherein the main line and the bypass lien are integrally formed in the water temperature governor. 
   
   
       5 . The fluid circuit of an engine of one of  claims 3 , wherein the oil circuit includes:
 a main oil line that is mounted in a cylinder block of the engine to receive oil from a hydraulic pump;   a first oil line that connects the turbocharger with the main oil line to guide the oil that is supplied from the main oil line to the turbocharger; and   a second oil line that guides oil that is returned from the turbocharger to the main oil line.   
   
   
       6 . The fluid circuit of an engine of  claim 3 , wherein in a case that the temperature of the coolant transmitted from the radiator is higher than a predetermined temperature, the main valve is opened such that the coolant that is cooled through the radiator is supplied to the water pump. 
   
   
       7 . The fluid circuit of an engine of  claim 3 , wherein the bypass line is a non-bypass valve type through which the coolant always flows. 
   
   
       8 . The fluid circuit of an engine of one of  claim 7 , wherein the oil circuit includes:
 a main oil line that is mounted in a cylinder block of the engine to receive oil from a hydraulic pump;   a first oil line that connects the turbocharger with the main oil line to guide the oil that is supplied from the main oil line to the turbocharger; and   a second oil line that guides oil that is returned from the turbocharger to the main oil line.