Hydraulic clutch control device of vehicle power unit

A hydraulic clutch control device for a hydraulic clutch of a power transmission system of a vehicle power unit, the vehicle power unit including an internal combustion engine having an engine main body mounted on a vehicle-body frame, the hydraulic clutch control device comprising:

• an oil pressure control valve disposed in the engine main body, wherein the oil pressure control valve controls an oil pressure of the hydraulic clutch and is arranged to have an operating direction extending in a front-rear direction of the vehicle-body frame;
• an actuator disposed in the engine main body, wherein the actuator is serially connected to the oil pressure control valve in the operating direction to drive the oil pressure control valve, and wherein the actuator has a coupler that protrudes laterally and to which an electric wire is connected, the coupler protruding obliquely upward or obliquely downward from the actuator in a view in an operation axis direction of the oil pressure control valve;
• a housing chamber that houses at least the actuator and is filled with hydraulic oil, the housing chamber being formed in a housing chamber forming body attached to the engine main body and the oil pressure control valve partially facing the housing chamber being supported by the housing chamber forming body, and
• an oil return hole used to return an excessive portion of the hydraulic oil from the housing chamber into the engine main body is provided in the housing chamber forming body to communicate with an upper portion of the housing chamber at an end portion of the housing chamber on a side close to the oil pressure control valve.

A hydraulic clutch control device for a hydraulic clutch of a power transmission system of a vehicle power unit, the vehicle power unit including an internal combustion engine having an engine main body mounted on a vehicle-body frame, the hydraulic clutch control device comprising:

• an oil pressure control valve disposed in the engine main body, wherein the oil pressure control valve controls an oil pressure of the hydraulic clutch and is arranged to have an operating direction extending in a front-rear direction of the vehicle-body frame;
• an actuator disposed in the engine main body, wherein the actuator is serially connected to the oil pressure control valve in the operating direction to drive the oil pressure control valve;
• a housing chamber that houses at least the actuator and is filled with hydraulic oil, the housing chamber being formed in a housing chamber forming body attached to the engine main body and the oil pressure control valve partially facing the housing chamber being supported by the housing chamber forming body, the housing chamber forming body including a supporting holder that is attached to the engine main body with the oil pressure control valve being fitted to and supported by the supporting holder;
• an oil return hole used to return an excessive portion of the hydraulic oil from the housing chamber into the engine main body is provided in the housing chamber forming body to communicate with an upper portion of the housing chamber at an end portion of the housing chamber on a side close to the oil pressure control valve, wherein part of the supporting holder is cut away to form the oil return hole opening upward and laterally in an upper portion of the supporting holder;
• and
• an eaves portion protrudes from the supporting holder and covers the oil return hole from above, wherein paired ribs extending vertically with the oil return hole interposed therebetween in a front-rear direction protrude integrally from the supporting holder with upper ends of the ribs being integrally continuous with the eaves portion.