Pawl and ratchet clutch having pawl with shifting center of grav

Details Pawl and ratchet clutch having pawl with shifting center of grav Pawl and ratchet clutch having pawl with shifting center of grav

1992-03-05

1993-09-21

Lorence, Richard M.

192 clutches and power-stop control

Clutches

Automatic

192 42, 192104C, F16D 4112, F16D 4314

Patent

active

052460940

ABSTRACT:
A pneumatic starter (10) incorporates a pawl and ratchet clutch assembly (50) having a ratchet member (46) mounted to a drive member (40) powered by an air expansion turbine (20), and a plurality of pawls (48) disposed circumferentially about the ratchet member (46) and operable in engagement therewith to transmit rotational drive torque from the drive member (40) to a driven member (60). Each of the pawls (48) is supported on a pivot pin (52) for pivotal movement into and out of engagement with the ratchet member (46) about its pivot axis (55). Preload springs (54) are provided for biasing the pawls (48) to pivot radially inwardly into engagement with the ratchet member (46). A weight ball (82) is disposed in a slot (80) extending along each pawl (48) so as to define a travel path between the toe end (47) and the heel end (48) thereof. As the ball (82) rolls along the travel path in response to the rotational speed of the driven member (60), the center of gravity (93) of the pawl shifts relative to its pivot axis (55).

REFERENCES:
patent: 709900 (1902-09-01), Gurney et al.
patent: 1219698 (1917-03-01), Brackett
patent: 1753825 (1930-04-01), Ford
patent: 1767593 (1930-06-01), Laabs
patent: 3727733 (1973-04-01), Mrazek
patent: 4116314 (1978-09-01), Ackerman
patent: 4187728 (1980-02-01), Mazzorana
patent: 4899534 (1990-02-01), Sorenson
patent: 4914906 (1990-04-01), Burch
patent: 4926631 (1990-05-01), Sorenson

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