Venting mechanism to enhance warming of a variable cam timing mechanism

Patent No. 8,387,574

Issued: March 5, 2013
Filed: April 7, 2010
Term Extension: 353 days

Inventors: McCloy; Chad (Cortland, NY), Smith; Franklin R. (Cortland, NY), White; Timothy K. (Sterling Heights, MI) 
Assignee: BorgWarner Inc. (Auburn Hills, MI)

The present invention increases cold temperature oil flow through the variable cam timing (VCT) phaser to reduce the amount of time it takes to replace this oil with warmer low viscosity oil and thereby improve performance. Furthermore the oil flow through the VCT phaser is reduced once the oil temperature reaches the minimum operating temperature for the VCT phaser to operate and the VCT phaser is commanded to move from the park position. Therefore, the VCT phaser is charged with hot engine oil and is commanded to move from the parked position. The VCT phaser reduces oil flow through the phaser at high oil temperatures and low oil viscosity while adding the benefit of increased oil flow through the phaser at low oil temperatures and high oil viscosity to facilitate getting warmer oil into the VCT phaser sooner for increased VCT performance.

Reference to Related Applications

This application claims one or more inventions which were disclosed in Provisional Application No. 61/167,407, filed Apr. 7, 2009, entitled "VENTING MECHANISM TO ENHANCE WARMING OF A VARIABLE CAM TIMING MECHANISM". The benefit under 35 USC 119(e) of the United States provisional application is hereby claimed, and the aforementioned application is hereby incorporated herein by reference.

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