Bias spring arbor for a camshaft phaser

Details Bias spring arbor for a camshaft phaser Bias spring arbor for a camshaft phaser

2006-09-29

2009-11-10

Chang, Ching (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

C123S090150, C123S090650, C464S160000

Reexamination Certificate

active

07614372

ABSTRACT:
A torque bias coil spring for a camshaft phaser disposed in an annular well formed in the phaser rotor and having a central arbor for supporting the spring. The radius of the central arbor is such that the spring has radial operating clearance of 5-10%, as in the prior art. However, the improved arbor includes regions of higher radius at the arbor ends supporting the innermost and outermost coils of the spring. These regions serve to prevent the spring from being laterally displaced during torsional motion, thus minimizing the relative motion at the spring contact points, reducing stress on the spring, and improving the efficiency of the spring by reducing frictional hysteresis.

REFERENCES:
patent: 6276321 (2001-08-01), Lichti et al.
patent: 6405695 (2002-06-01), Mizutani et al.
patent: 6457447 (2002-10-01), Sato et al.
patent: 7165521 (2007-01-01), Nakajima

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