| 摘要 |
PURPOSE: A hydraulic pre-damper for a clutch disk is provided to effectively damp little shock generated by a torque change followed by an engine stroke by a high damping rate, under low speed conditions and suppress production of a mono shock noise caused by shift shock on which relative great torque acts, under high speed conditions. CONSTITUTION: A hydraulic pre-damper(20) for a clutch disk damps shock caused by a difference in the rotational speed of a spline hub(2) and a hub flange(1) by simultaneously engaging with a pair of forks formed to the spline hub with an interval in the circumferential direction and a pair of forks formed to the hub flange with an interval in the circumferential direction. The hydraulic pre-damper for the clutch disk comprises a cylinder forming a pressure chamber(21a) in which a fluid is filled and a storage chamber connected to the pressure chamber; a pair of plungers(22) each movably fitted to the sides of the cylinder and simultaneously engaged with each fork if the pressure chamber is shut tight; an opening and shutting unit opening a through hole formed between the pressure chamber and the storage chamber just when the rotational speed of the spline hub is over reference speed; and a pressurizing piston movably installed on a side of the storage chamber, to vary the volume of the storage chamber, and supported by a compression spring.
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