Patent ID: 8544433
Filing Date: 2013-10-01
Classification: F01L

Abstract:
1. A variable valve timing control apparatus, comprising: a drive-side rotary member rotating in synchronization with a rotation of a crank shaft; a driven-side rotary member arranged coaxially with the drive-side rotary member and rotating in synchronization with a rotation of a cam shaft for opening and closing a valve of an internal combustion engine; a partition portion arranged at least one of the drive-side rotary member and the driven-side rotary member to partition a fluid pressure chamber, which is formed by the drive-side rotary member and the driven-side rotary member, into an advanced angle chamber and a retarded angle chamber a seal member arranged at a portion of the partition portion, which faces the other one of the drive-side rotary member and the driven-side rotary member, the seal member avoiding a hydraulic fluid from leaking between the advanced angle chamber and the retarded angle chamber due to a relative rotation between the drive-side rotary member and the driven-side rotary member; and a biasing member elastically deformed to exert a biasing force to bias the seal member from the partition portion arranged at the one of the drive-side rotary member and the driven-side rotary member toward the other one of the drive-side rotary member and the driven-side rotary member, wherein at least one of the drive-side rotary member and the driven-side rotary member is manufactured by a die-casting process, and wherein at least one of the partition portion and a facing surface of the other one of the die-casting drive-side rotary member and the die-casting driven-side rotary member facing the partition portion is defined by an inclined surface of a tapered portion.