Patent ID: 8915223
Filing Date: 2014-12-23
Classification: F01L

Abstract:
1. A valve timing control apparatus comprising: a driving-side rotary member rotated in synchronism with a crank shaft; a driven-side rotary member disposed coaxial with the driving-side rotary member and rotated in synchronism with a valve opening/closing cam shaft of an internal combustion engine; a partitioning portion provided in at least one of the driving-side rotary member and the driven-side rotary member for partitioning a fluid pressure chamber formed by the driving-side rotary member and the driven-side rotary member into a retard angle chamber and an advance angle chamber; a sealing element disposed at a position of the partitioning portion that faces the driving-side rotary member or the driven-side rotary member or at a position of the driving-side rotary member or the driven-side rotary member that faces the partitioning portion, the sealing element preventing leakage of work fluid between the retard angle chamber and the advance angle chamber in association with relative rotation between the driving-side rotary member and the driven-side rotary member; and an S-shaped urging member that provides an urging force due to elastic deformation thereof for urging the sealing element from the side of the partitioning portion to the side of the driving-side rotary member or the driven-side rotary member or urging the sealing element from the side of the driving-side rotary member or the driven-side rotary member to the side of the partitioning portion; wherein the urging member includes: wherein the one end side contact portion and the other end side contact portion partially overlap each other at the center of the urging member in a longitudinal direction thereof, and the remaining portions do not overlap each other, when the urging member is viewed along a radial direction of the driving-side rotary member or the driven-side rotary member; wherein the one end side contact portion and the crest-folded portion do not overlap each other, and the other end side contact portion and the trough-folded portion do not overlap each other, when the urging member is viewed along the radial direction; and wherein in association with urging of the urging member, the distance between the one end side contact portion and the other end side contact portion along the urging direction is decreased and the angles of the trough-folded portion and the crest-folded portion are decreased during operation of the apparatus.