Patent ID: 9708964
Date: 2017-07-18
CPC Classifications: F01P,F02M

Claim:
1. A cooling apparatus for an engine that comprises a cooling path through which coolant flows to circulate by a coolant pump for cooling an engine main body and a device to be cooled, the cooling path comprising a downstream side connection conduit that is connected to a downstream side of the coolant pump, an upstream side connection conduit that is connected to an upstream side of the coolant pump, a first cooling conduit that branches off from the downstream side connection conduit and cools at least one portion of the engine main body, a second cooling conduit that branches off from the downstream side connection conduit and is provided in parallel with the first cooling conduit, an intermediate cooling conduit that is connected to the first cooling conduit and to the second cooling conduit and is provided with the device to be cooled, a third cooling conduit that runs from a position of connection of the intermediate cooling conduit and the first cooling conduit to the upstream side connection conduit, and a fourth cooling conduit that runs from a position of connection of the intermediate cooling conduit and the second cooling conduit to the upstream side connection conduit, the cooling apparatus further comprising: a flow resistance regulation device provided in any one of the first cooling conduit, the second cooling conduit, the third cooling conduit, and the fourth cooling conduit, to regulate flow resistance, the flow resistance regulation device making, by a motion of the flow resistance regulation device, a change of direction in which coolant flows in the intermediate cooling conduit is changed over between a first direction from the first cooling conduit towards the second cooling conduit, and a second direction from the second cooling conduit towards the first cooling conduit, and a changeover valve as the flow resistance regulation device, and wherein the flow resistances of the first cooling conduit, the second cooling conduit, the third cooling conduit and the fourth cooling conduit are set so that coolant flows in the intermediate cooling conduit in the first direction when the changeover valve provided in the first cooling conduit or in the fourth cooling conduit is at a valve opening position.