Pawl and ratchet clutch with pawl holdback

Details Pawl and ratchet clutch with pawl holdback Pawl and ratchet clutch with pawl holdback

1992-03-05

1993-04-27

Bonck, Rodney H.

192 clutches and power-stop control

Clutches

Automatic

74576, 192 84PM, 192104C, 192114R, F16D 4112, F16D 4304

Patent

active

052053865

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 ferromagnetic 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 for pivotal movement into and out of engagement with the ratchet member (46). Springs (54) are provided for biasing the pawls (48) to pivot radially inwardly into engagement with the ratchet member (46). At least one magnet (82) is disposed in operative association with and radially outwardly of each pawl (48), whereby the ferromagnetic pawls (48) are held by the magnets (82) out of engagement with the ratchet member (46) when the driven shaft (60) is rotating at a speed above a desired reengagement speed.

REFERENCES:
patent: 2340368 (1944-02-01), Dodge
patent: 3240304 (1966-03-01), Wickersham
patent: 3656598 (1972-04-01), Goble
patent: 3727733 (1973-04-01), Mrazek
patent: 3791231 (1974-02-01), Geary
patent: 4187728 (1980-02-01), Mazzorana
patent: 4520914 (1985-06-01), Kagiyama et al.
patent: 4899534 (1990-03-01), Sorenson
patent: 4914906 (1990-04-01), Burch
patent: 4926631 (1990-05-01), Sorenson

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