Multi-speed gear hub shiftable under load
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United States of America Patent
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-
Feb 17, 2004
Grant Date -
Jan 23, 2003
app pub date -
Jul 17, 2002
filing date -
Jul 17, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A multi-speed gear hub shiftable under load having a hub shell, a stationary hub shaft, a bearing-mounted driver, and a planet gear mechanism having a ring gear and a planet carrier. A selector element displaces a coupler and introduces a shifting motion into the gearing system. The power travels from the driver to a pawl carrier having rotational play and then to the ring gear and the coupler via the pawls. To implement the backpedal brake, the pawls on the pawl carrier are controlled in a directionally dependent manner via a cam element that is joined nonrotatably to the driver. A spring-preloaded shifting sleeve disengages the pawls with a driving contour on the coupler which is initiated by the selector element. The ring gear carries stud-mounted displacement pawls and is split to simplify production and assembly. The braking operation is always performed in the low gear ratio and thus always exhibits the same braking effect regardless of the gear selection.
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