Valve timing control device for internal combustion engine

A rotational phase adjustment device for adjusting a rotational phase of an input shaft and an output shaft, comprising:

• a stationary housing;
• a tubular input member adapted for rotation with the input shaft;
• a tubular output member adapted for rotation with the output shaft, said output member being coaxial with said input member, and there being formed an annular space between said input member and said output member;
• a phase adjustment mechanism including a piston mounted within said annular space for movement in an axial direction of said input and output members, a pair of hydraulic chambers being formed respectively on opposite sides of said piston in its axial direction, and said phase adjustment mechanism further including means for rotating said input member and said output member relative to each other in accordance with the movement of said piston in the axial direction;
• a ring plate including an annular portion held in contact with an inner surface of said housing and fixed to said housing, and a pair of cylindrical rims extending axially from said annular portion;
• a first oil seal provided between one of said pair of rims of said ring plate and said input member;
• a second oil seal provided between the other rim of said ring plate and said output member;
• first oil passage means provided in said housing and said annular portion of said ring plate and communicated with one of said pair of hydraulic chambers;
• and
• second oil passage means separated by said ring plate from said first oil passage means and communicated with the other hydraulic chamber.

A valve timing control device for mounting on an end portion of a camshaft, driving valves of an internal combustion engine, for changing a rotational phase of the camshaft, comprising:

• an inner tubular sleeve adapted to be fixedly mounted on an end portion of the camshaft;
• an outer tubular sleeve adapted to be rotatably mounted on the camshaft, said outer sleeve being provided around said inner sleeve and the end portion of said camshaft, and there being formed an annular space between said inner sleeve and said outer sleeve;
• a piston mounted within said annular space for interconnecting said inner and outer sleeves in a direction of rotation of said sleeves, said piston being movable in an axial direction to rotate said inner and outer sleeves relative to each other, a pair of first and second hydraulic chambers being formed respectively on opposite sides of said piston in its axial direction, said first hydraulic chamber being disposed remote from the camshaft, and said second hydraulic chamber being disposed close to the camshaft;
• a stationary housing;
• a ring plate including an annular portion held in contact with an inner surface of said housing and fixed to said housing, and a pair of first and second tubular rims extending axially from said annular portion;
• a first oil seal provided between said first rim of said ring plate and said inner sleeve;
• a second oil seal provided between said second rim of said ring plate and said outer sleeve;
• first oil passage means provided in said housing and said annular portion of said ring plate and communicated with said first hydraulic chamber;
• and
• second oil passage means separated by said ring plate from said first oil passage means and communicated with the second hydraulic chamber.