Machine element or mechanism – Elements – Cranks and wrist pins
Patent
1994-06-21
1996-10-01
Bonck, Rodney H.
Machine element or mechanism
Elements
Cranks and wrist pins
74573R, 74574, 74603, 123 9031, F16F 7116
Patent
active
055602673
ABSTRACT:
A camshaft vibration damper comprises an inertia ring having a friction clutch surface disposed in driving contact with a complementary clutch surface and a spring for biasing the clutch surfaces toward one another. The complementary clutch surface may be disposed on a drive member, for example, a camshaft sprocket or similar structure rotating with the camshaft. The spring is a compression spring, preferably a Belleville spring washer, which biases the two friction clutch surfaces together. The inertia of the inertia ring opposes the instantaneous variations in rotational speed (d.theta./dt) of the camshaft causing relative rotation between the inertia ring and the drive member thereby reducing vibration without resisting camshaft rotation. Relative motion at the clutch face between the inertia ring and the drive member results in energy absorption and dissipation thereby minimizing unwanted vibration. Such energy adsorption is a function of: the moment of inertia of the inertia ring, the coefficient of friction of the clutch interface and the biasing force provided by the Belleville spring washer.
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Hans Kolstee, Motion and Power, .COPYRGT. 1982 p. 90 lines 16-17 and p. 105 lines 23-25.
Simon K. Chen and Thomas Chang, SAE Techical Paper No. 861226--Crankshaft Torsional and Damping Simulation--An Update and Correlation with Test Results--1986.
Miller Alan L.
Robbins Francis B.
Todd Kevin B.
Bonck Rodney H.
Borg-Warner Automotive Inc.
Dziegielewski Greg
Kim Chong H.
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