Patent ID: 8857394
Filing Date: 2014-10-14
Classification: F01L,F02D

Abstract:
1. A variable valve timing control apparatus, comprising: a driving-side rotating member rotating synchronously with a crank shaft of an internal combustion engine; a driven-side rotating member rotating integrally with a cam shaft of the internal combustion engine and being rotatable relative to the driving-side rotating member; a control valve operating for switching supply and discharge of a working fluid in a selective manner relative to an advanced angle chamber and a retarded angle chamber which are provided between the driving-side rotating member and the driven-side rotating member; an advanced angle-side oil passage providing fluid communication between the control valve and the advanced angle chamber; a retarded angle-side oil passage providing fluid communication between the control valve and the retarded angle chamber; a spider arranged coaxially with the cam shaft and provided with a first oil passage and a second oil passage which is different from the first oil passage, a part of the advanced angle-side oil passage functioning as the first oil passage, a part of the retarded angle-side oil passage functioning as the second oil passage; a seal mechanism partitioning between at least one of the first oil passage and the second oil passage, and an outside space; and the seal mechanism allowing air to come in said at least one of the first oil passage and the second oil passage in a case where pressure inside said at least the one of the first oil passage and the second oil passage is lower than air pressure of the outside space.