Patent number: 6814038

Spool valve controlled VCT locking pin release mechanism

Original Assignee: BorgWarner Inc.

Field of technology: Vehicles, Engines and Transportation

Patent granted on: Tue, 09 Nov 2004

Patent drawing

Abstract

A variable cam timing system that utilizes the same spool that controls the VCT mechanism to actively control the locking pin. The positions of the spool's multiple lands directly influences whether source oil is supplied to both the locking pin and either the retard or advance chamber of the phaser.