Gear propulsion device for pneumatic motor

Abstract

The invention relates to a gear propulsion device for a pneumatic motor and belongs to the field of pneumatic motor starters. The gear propulsion device comprises a housing, a pinion wheel, an output shaft, a spline shaft, a bearing support, a bearing, a reset spring, O-shaped seal rings and a piston, wherein the housing is provided with a front cavity and a rear cavity; an air inlet and an air outlet are formed in the rear cavity of the housing in the radial direction; the piston and the bearing support are arranged in the rear cavity; the piston is matched with a cylinder formed between the inner wall of the rear cavity and the bearing support; the inner wall of the cylinder is divided into three segments with different diameters; the diameter of the middle segment is bigger than those of the front segment and the rear segment; the front end of the piston is connected with the spline shaft through the bearing in the radial direction; a stepped shaft is arranged at the rear end of the piston and provided with an axial throttling hole; one end of the spline shaft is axially connected with the output shaft; the end part of the output shaft penetrates a shaft hole of the front cavity to be arranged at the outer end of the housing and is connected with the pinion wheel; the reset spring is arranged between the bearing and the step of the front cavity. The gear propulsion device has the advantages of long service life, high safety factor, simple structure, easiness for implementation and the like.

Description

technical field [0001] The present invention relates to an engine pneumatic starter, and more specifically, the present invention relates to a gear propulsion device for an air starter motor that drives the output pinion of the pneumatic starter motor to mesh with the flywheel ring gear of the engine. Background technique [0002] The pre-engaged air starter motor is one of the components of the engine configuration. It's just for starting the engine. In order to protect the engine and starter motor, when the engine is not starting, the starter motor drive pinion needs to be separated from the engine flywheel ring gear and keep a certain distance from it (called FRG size), usually FRG size is 5.5mm. When starting the engine, compressed air enters the cylinder from the motor air inlet to push the piston to overcome the spring force, push the motor drive shaft and pinion axially out, and mesh with the engine flywheel ring gear. When the "top teeth" phenomenon occurs duri...

AI Technical Summary

Problems solved by technology

This thrust is much greater than the resistance of the return spring. When the phenomenon of "top teeth" occurs, the pinion will collide with the ring gear of the flywheel, which will greatly shorten the life of the ring gear of the flywheel and the pinion, especially in applications that require frequent starting.

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