Valve timing adjusting apparatus

A valve timing adjusting apparatus that is placed in a drive force transmission path for transmitting a drive force from a driving-side shaft of an internal combustion engine to a driven-side shaft and adjusts valve timing of at least one of an intake valve and an exhaust valve driven by the driven-side shaft, the valve timing adjusting apparatus comprising:

• a housing that is rotatable integrally with one of the driving-side shaft and the driven-side shaft;
• a vane rotor that is received in the housing and is rotatable integrally with the other one of the driving-side shaft and the driven-side shaft, wherein the vane rotor has a vane, which partitions a corresponding inner space of the housing into an advancing chamber and a retarding chamber, and the vane rotor includes:
• an advancing oil passage that is communicated with the advancing chamber;
• a retarding oil passage that is communicated with the retarding chamber;
• and
• a supply oil passage that is communicatable with an external oil supply source;
• a sleeve that is configured into a tubular form and extends in an axial direction at a center portion of the vane rotor, wherein the sleeve includes:
• an advancing port that is communicated with the advancing oil passage;
• a retarding port that is communicated with the retarding oil passage;
• and
• a supply port that is communicated with the supply oil passage;
• and
• a spool that is displaceable in the axial direction in an inside of the sleeve, wherein the spool connects between the supply port and the advancing port when the vane rotor is rotated to an advancing side relative to the housing, and the spool connects between the supply port and the retarding port when the vane rotor is rotated to a retarding side relative to the housing, wherein:
• the vane rotor includes:
• a laminated portion that includes a plurality of metal plates, which are stacked in the axial direction;
• and
• a seal portion that is placed on at least one of two axially opposite sides of at least one of the advancing port, the retarding port, and the supply port and is configured into an annular form to extend along an outer peripheral surface of the sleeve in a circumferential direction, wherein the seal portion is engaged with the laminated portion to limit displacement or deformation of the seal portion toward a radially outer side and is made of a material that has a thermal expansion coefficient, which is larger than a thermal expansion coefficient of a material of each of the plurality of metal plates.