| 摘要 |
Disclosed herein is an apparatus and system for isolating torsional vibrations in a driveline having a friction torque device and a ratio-change transmission. The friction torque device includes a driven member having radially extending projections for coupling the friction torque device to a shaft. The apparatus comprises a rotatably supported input shaft having a first end, a second end and an inner bore. A plurality of projections are disposed adjacent to the first end of the input shaft for engaging the radially extending projections of a driven member. The apparatus further comprises a torsion bar having a torsional spring rate, where the torsion bar is at least partially disposed within the bore of the input shaft. The torsion bar has a first end and a second end, the second end of the torsion bar is coupled to the input shaft. A plurality of projections are disposed adjacent to the first end of the torsion bar for engaging the radially extending projections of a driven member of a friction torque device. A lash is present between the input shaft projections and the radially extending projections of a driven member to provide relative rotation of the torsion bar to the input shaft. The radially extending projections have a negligible lash with respect to the torsion bar projections and therefore rotate with the torsion bar and act as a rotational governing means with respect to rotation between the torsion bar and input shaft.
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