Air turbine starter having a panel and ratchet clutch

Details Air turbine starter having a panel and ratchet clutch Air turbine starter having a panel and ratchet clutch

1988-03-08

1990-02-13

Stout, Donald E.

Power plants

Combustion products used as motive fluid

60 39142, 74 7C, 192 451, 192 47, F02C 7277

Patent

active

048995347

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:
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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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