Dray torque relationship of a undirectional clutch in an engine

Details Dray torque relationship of a undirectional clutch in an engine Dray torque relationship of a undirectional clutch in an engine

1989-12-01

1991-01-22

Herrmann, Allan D.

Machine element or mechanism

Engine starters

Automatic

74 7A, 74 7E, 192 45, F02N 1500

Patent

active

049861409

ABSTRACT:
An engine starter motor comprising an electric motor, a unidirectional clutch connected to the motor and having an output shaft, the unidirectional clutch exhibiting a drag torque appearing when the unidirectional clutch is being rotated in an idle direction, a speed reduction unit connected to the unidirectional clutch, and a pinion shaft having a pinion gear for engaging and driving an engine ring gear and connected to the speed reduction unit through helical splines. The drag torque T of the unidirectional clutch is determined to be equal to or smaller than a drag torque To, at which a return force F on the pinion shaft with an over-running clutch mounted thereon does not exceed an operating force on the pinion shaft by a solenoid, divided by a speed reduction ratio g between the over-running clutch and the pinion shaft.

REFERENCES:
patent: 2561940 (1951-07-01), Metsger
patent: 3958678 (1976-05-01), Jetee
patent: 4412457 (1983-11-01), Colvin et al.
patent: 4440033 (1984-04-01), Kurihara et al.
patent: 4587861 (1986-05-01), Morishita
patent: 4592243 (1986-06-01), Katoh et al.
patent: 4604907 (1986-08-01), Morishita et al.
patent: 4738148 (1988-04-01), Norton
patent: 4881416 (1989-11-01), Isozumi
Heldt, Torque Converters or Transmissions, 1942, pp. 88-100, Over-Running Clutches.

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