Variable CAM timing (VCT) system having modifications to increase CAM torsionals for engines having limited inherent torsionals 

Patent No. 6,932,037

Issued: August 23, 2005
Filed: July 15, 2003

Inventors: Simpson; Roger T. (Ithaca, NY); Mott; Philip J. (Dryden, NY)
Assignee: BorgWarner Inc. (Auburn Hills, MI)


In a variable cam timing (VCT) system that has a crank shaft coupled to at least one cam shaft. The system has at least one timing gear associated with the crank shaft or a cam shaft. The timing gear includes at least two groups of toothlike projections including a first group having a first distance to the center of the wheel, and a second group having a second distance to the center of the wheel. The first distance is different from the second distance. Whereby torsional energy for torque actuated purposes is increased for the VCT system. The system may further include a resonator which is positioned upon the at least one cam shaft, the resonator including at least one mass and at least one elastic element. Whereby torsional oscillation of the at least one cam shaft at a predetermined engine speed range is increased.

REFERENCE TO PROVISIONAL APPLICATION

This application claims an invention which was disclosed in Provisional Application No. 60/443,060, filed Jan. 28, 2003, entitled "CAM TORQUE ACTUATED (CTA) VARIABLE CAM TIMING (VCT) SYSTEM HAVING MIDIFICATIONS TO INCREASE CAM TORSIONALS FOR ENGINES (E.G. 4-CYLINDER) HAVING LIMITED INHERENT TORSIONALS". 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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