Pawl and ratchet clutch and air turbine starter having such a cl

Details Pawl and ratchet clutch and air turbine starter having such a cl Pawl and ratchet clutch and air turbine starter having such a cl

1989-06-14

1990-05-22

Stout, Donald E.

Power plants

Combustion products used as motive fluid

Different fluids

74 7C, 192 451, 192 47, F02C 7277

Patent

active

049266314

ABSTRACT:
An air turbine starter for use in starting a turbine engine includes a pawl and ratchet clutch having a movable member which selectively prevents engagement of the clutch while providing a pawl raceway surface, or allows clutch engagement. No-load acceleration of the air turbine starter is scheduled to ensure that drop-in speed of the centrifugally responsive pawls is not reached by the ratchet member while clutch engagement is being permitted. The movable member is pneumatically controlled in timed coordination with acceleration of the air turbine starter to prevent crash engagement of the clutch. Clutch ratcheting is also substantially prevented.

REFERENCES:
patent: 1946177 (1934-02-01), Neurath
patent: 2077253 (1937-04-01), Nardone
patent: 2640359 (1953-06-01), Gilbert et al.
patent: 2693707 (1954-11-01), Gilbert
patent: 2776571 (1957-01-01), Simone
patent: 2921473 (1919-01-01), Fellows
patent: 2951570 (1960-09-01), Antrim, Jr. et al.
patent: 2988186 (1961-06-01), Dotter
patent: 3638774 (1972-02-01), Burch et al.
patent: 4050560 (1977-09-01), Torstenfelt
patent: 4187728 (1980-02-01), Mazzorana
patent: 4702273 (1987-10-01), Allen, Jr. et al.
patent: 4805470 (1989-02-01), Woodruff

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