Starter embedded output shaft assembly

Abstract

The invention relates to a starter embedded output shaft assembly. The starter embedded output shaft assembly comprises an output long shaft, an output short shaft and a thin safety shaft; the axis ofthe output long shaft and the axis of the output short shaft are provided with shaft holes in the axial direction, and the thin safety shaft is arranged in the shaft holes of the output long shaft and the output short shaft; the front end of the thin safety shaft is provided with a limiting pin hole, the front end of the shaft hole formed in the output long shaft is provided with a slide groove in the axial direction so that a first limiting pin can be inserted into the limiting pin hole formed in the front end of the thin safety shaft and arranged in the axial slide groove formed in the front end of the output long shaft when the thin safety shaft is inserted into the shaft holes, and the thin safety shaft is in limiting connection with the output long shaft through the first limiting pin in the circumferential direction; and the middle of the shaft hole of the output long shaft is provided with a thrust stepped hole, the front end of the thin safety shaft is sleeved with a spring inthe compressed state, the spring is arranged between the thrust stepped hole and the first limiting pin, and the inner side of the front end of the thin safety shaft is provided with a thin safety shaft cutting section.

Description

technical field [0001] The invention relates to the technical field of aviation starters, in particular to a starter embedded output shaft assembly. Background technique [0002] As the key product of the engine starting system in the aviation system, the starter is widely used in military and civilian aircraft. Its performance directly determines whether the engine starts successfully, and the output shaft is the torque transmission link connecting the engine and the starter. An important part of. The traditional one-piece design of the output shaft has a simple structure, and its shear shaft is mainly designed for twisting protection in consideration of the safe operation of the engine, but it cannot take into account the safe operation requirements of the starter at the same time. If the integral output shaft cannot be twisted off in time to protect the starter in the event of starter overload or mechanical failure, it will cause further damage to the starter, resulting ...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above-mentioned technical problems, the starter embedded output shaft assembly provided by the present invention includes a long output shaft, a short output shaft and a thin safety shaft. The end surface of the front end is provided with a plurality of transmission ladder teeth protruding in the axial direction, and each transmission ladder tooth is provided with a right-angled starting surface on one side of the circumference, and a slope separation surface is provided on the other side. A transmission groove matching the shape of the transmission ladder tooth, the front end of the output long shaft is matched with the engine transmission, the shaft center of the output long shaft and the shaft center of the output short shaft are axially provided with shaft holes, and the The thin safety shaft is placed in the shaft hole of the output short shaft and the output long shaft, the front end of the thin safety shaft is provided with a limit pin hole for installing the first limit pin, and the front end of the inner shaft hole of the output long shaft is along The chute is arranged in the axial direction so that when the thin safety shaft is inserted into the shaft hole, the first limit pin inserted into the limit pin hole at the front end of the thin safety shaft is placed in the chute at the front end of the output long shaft, and the thin safety shaft and the output long shaft through the first limit pin for circumferential limit connection; the middle part of the shaft hole of the output long shaft is provided with a thrust step hole, and the thin safety shaft is equipped with a spring with a pressing force , the spring is placed between the thrust step hole and the first limit pin, the front end of the thin safety shaft is provided with a thin safety shaft shear section; the tail end of the thin safety shaft, the output short shaft The tail ends of the pin shafts are respectively radially penetrated to set the pin shaft sockets. When the tail end of the thin safety shaft is placed in the shaft hole at the tail end of the output short shaft, the second limit pin is inserted along the pin shaft sockets to the The thin safety shaft and the output short shaft are connected, and finally the output long shaft and the output short shaft are fitted and connected through the thin safety shaft with a compression spring; in the starting state, the starter drives the output short shaft to rotate, and the output short shaft passes through The right-angled starting surface of the transmission ladder tooth and the output long shaft are in transmission cooperation, thereby starting the engine connected to the output long shaft; after the engine is running normally, since the engine speed is higher than the starter speed, at this time, it passes through the slope separation surface on the output long shaft Cooperate with the slope separation surface of the short output shaft, and the thin safety shaft with a compression spring compresses and fits the separation surface axially to ensure that the output shaft of the starter runs at high speed under the normal working state of the engine; When the short-term output torque increases but is less than the maximum torque value for safe operation of the starter during operation, and the shear section of the thin safety shaft elastically deforms, the fitting and separation surfaces can be adaptively adjusted by means of the elastic force of the compression spring. Keep a stable fitting; if the engine speed is over-rotated or the starter parts are stuck when the engine is running, the engine torque suddenly increases to exceed the maximum torque value of the starter for safe operation, the shear section of the thin safety shaft Under the action of torsional force and axial force, the fracture will be accelerated in time, and the mating separation surface of the output long shaft and output short shaft will be separated quickly, effectively avoiding secondary damage to the starter and timely protecting the safety of the starter

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