Cooling water control valve device

A cooling water control valve device for controlling a flow amount of cooling water passing through an internal combustion engine comprising:

• a housing unit having a cylindrical passage member, through which the cooling water flows;
• a valve unit having a valve main body rotatable around its axis and a valve opened portion formed at an outer peripheral surface of the valve main body, through which the cooling water passes;
• a valve seat unit having a positioned member of a cylindrical shape or an annular shape and a valve seat surface of an annular shape, wherein an inner peripheral surface of the positioned member is positioned by an outer peripheral surface of the cylindrical passage member and the positioned member is movable in an axial direction of the positioned member in a reciprocal manner, and wherein the valve seat surface is capable of holding a fluid tight condition between the valve main body and the valve seat surface when the valve seat surface is in contact with the outer peripheral surface of the valve main body on an axial side of the positioned member;
• a biasing member for biasing the valve seat unit in such a way that the valve seat surface is pushed to the outer peripheral surface of the valve main body;
• and
• multiple grooves formed in the cylindrical passage member at least in a part of an overlapping area, at which the cylindrical passage member and the positioned member overlap each other in an axial direction of the cylindrical passage member,
• wherein each of the grooves is formed in the outer peripheral surface of the cylindrical passage member in such a way that the groove is recessed in a radial-inward direction of the cylindrical passage member from the outer peripheral surface,
• wherein each of the grooves extends in the axial direction of the cylindrical passage member, and
• wherein the multiple grooves are arranged in a circumferential direction of the cylindrical passage member.

A cooling water control valve device for controlling a flow amount of cooling water passing through an internal combustion engine comprising:

• a housing unit having a cylindrical passage member, through which the cooling water flows;
• a valve unit having a valve main body rotatable around its axis and a valve opened portion formed at an outer peripheral surface of the valve main body, through which the cooling water passes;
• a valve seat unit having a positioned member of a cylindrical shape or an annular shape and a valve seat surface of an annular shape, wherein an outer peripheral surface of the positioned member is positioned by an inner peripheral surface of the cylindrical passage member and the positioned member is movable in an axial direction of the positioned member in a reciprocal manner, and wherein the valve seat surface is capable of holding a fluid tight condition between the valve main body and the valve seat surface when the valve seat surface is in contact with the outer peripheral surface of the valve main body on an axial side of the positioned member;
• a biasing member for biasing the valve seat unit in such a way that the valve seat surface is pushed to the outer peripheral surface of the valve main body;
• and
• multiple grooves formed in the positioned member at least in a part of an overlapping area, at which the cylindrical passage member and the positioned member overlap each other in the axial direction of the positioned member,
• wherein each of the grooves is formed in the outer peripheral surface of the positioned member in such a way that the groove is recessed in a radial-inward direction of the positioned member from the outer peripheral surface,
• wherein each of the grooves extends in the axial direction of the positioned member, and
• wherein the multiple grooves are arranged in a circumferential direction of the positioned member.

A cooling water control valve device for controlling a flow amount of cooling water passing through an internal combustion engine comprising:

• a housing unit having a cylindrical passage member, through which the cooling water flows;
• a valve unit having a valve main body rotatable around its axis and a valve opened portion formed at an outer peripheral surface, through which the cooling water passes;
• a valve seat unit having a positioned member of a cylindrical shape or an annular shape and a valve seat surface of an annular shape, wherein an inner peripheral surface of the positioned member is positioned by an outer peripheral surface of the cylindrical passage member and the positioned member is movable in an axial direction of the positioned member in a reciprocal manner, and wherein the valve seat surface is capable of holding a fluid tight condition between the valve main body and the valve seat surface when the valve seat surface is in contact with the outer peripheral surface of the valve main body on an axial side of the positioned member;
• a biasing member for biasing the valve seat unit in such a way that the valve seat surface is pushed to the outer peripheral surface of the valve main body;
• and
• multiple grooves formed in the positioned member at least in a part of an overlapping area, at which the cylindrical passage member and the positioned member overlap each other in the axial direction of the positioned member,
• wherein each of the grooves is formed in the inner peripheral surface of the positioned member in such a way that the groove is recessed in a radial-outward direction of the positioned member from the inner peripheral surface,
• wherein each of the grooves extends in the axial direction of the positioned member, and
• wherein the multiple grooves are arranged in a circumferential direction of the positioned member.