LOCK-UP DEVICE FOR TORQUE CONVERTER
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United States of America Patent
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Issued Date -
Feb 28, 2013
app pub date -
May 17, 2011
filing date -
Jun 4, 2010
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A lock-up device for a torque converter is provided whereby vibration attributed to coil springs can be reliably inhibited. In the lock-up device, two large coil springs of each pair are disposed in series. Stiffness ratios α1 and α2 between an N-th torsional stiffness and an (N+1)-th torsional stiffness are set to be greater than or equal to 1.5 and less than or equal to 3.0 (N is positive integer) in a multistage torsional characteristic produced by compressing at least one of the two large coil springs of each pair and a small coil spring in accordance with a relative angle between an input rotary member and an output rotary member.
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