Engine air starter

Details Engine air starter Engine air starter

1977-10-17

1978-11-21

Herrmann, Allan D.

Internal-combustion engines

Starting device

For airplane

74 7R, F02N 708, F02N 1506

Patent

active

041261135

ABSTRACT:
An air starter includes a housing having a rotatable shaft extending longitudinally thereof. A gear is connected in a longitudinally extending helical groove on the shaft so that when the gear is moved along the shaft it engages an engine flywheel whereby the flywheel may be rotated by an air motor connected to the shaft. Piston means surround the shaft and sealably and slidably engage within a cylinder formed in the housing and the housing is provided with inlet and exhaust air passages for conducting air to the cylinder and discharging air therefrom. First spring means abut the piston means and the housing to urge the piston means to a first position in the housing. Annular means extend into the helical groove on the shaft and is arranged to rotate with the gear, therebeing second spring means between the gear and said annular means to retain said annular means disengaged from the gear when the piston means is in the first position. When air is supplied to the cylinder, the piston means is moved against the first spring means and engages the annular means with the gear to move the annular means and gear along the helical groove in the shaft to engage the gear with the engine flywheel. Means indicate when the gear engages the engine flywheel, and if the gear does not engage the flywheel the first time it abuts thereagainst, the annular means and gear are constructed and arranged so that upon subsequent operation of the piston means, the gear is rotated to align with and engage the engine flywheel.

REFERENCES:
patent: 3051136 (1962-08-01), Muehlhausen
patent: 3791365 (1974-02-01), Pharr et al.
patent: 3794009 (1974-02-01), Wenrich et al.

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