Machine element or mechanism – Engine starters – Automatic
Patent
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:
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patent: 3958678 (1976-05-01), Jetee
patent: 4412457 (1983-11-01), Colvin et al.
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patent: 4738148 (1988-04-01), Norton
patent: 4881416 (1989-11-01), Isozumi
Heldt, Torque Converters or Transmissions, 1942, pp. 88-100, Over-Running Clutches.
Isozumi Shuzoo
Morishita Akira
Herrmann Allan D.
Laub David W.
Mitsubishi Denki & Kabushiki Kaisha
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