Idle wheel structure of aeroengine accessories case

Abstract

The invention provides an idle wheel structure of an aeroengine accessories case. The idle wheel structure comprises an idle wheel shaft, a bearing and a gear ring, wherein one end of the idle wheel shaft is fixed to a front housing of the accessories case through a pressure plate, and the other end of the idle wheel shaft is fixed to a rear housing of the accessories case; the bearing sleeves theidle wheel shaft; the gear ring is mounted on the bearing; the gear ring is used for transmitting transmission between a first heavy-load wheel and a second heavy-load wheel. The idle wheel structureprovided by the invention enables an idle wheel shaft not to rotate, so that dynamic imbalance amount and gyroscopic moment of the gear shaft are reduced; the idle wheel shaft is rigidly connected toan accessories case shell, so that rigidity of the shell is increased, and shell deformation under heavy load is reduced; the idle wheel shaft is of a single bearing structure, so that length of thegear shaft can be reduced, load can be reduced and space can be saved; and a bearing of a greater diameter can be used under the original space condition, so that service life reliability of the bearing is improved.

Description

technical field [0001] The application belongs to the technical field of aero-engine transmission, and in particular relates to an idler gear structure of an aero-engine accessory case. Background technique [0002] Such as figure 1 As shown, on the heavy-duty side of the aero-engine accessory case, limited by the center distance of the accessories installed on the accessory case, an idler 20 is often set between the heavy-duty wheel 10 and the heavy-duty wheel 30 to extend the drive chain, The idler wheel 20 is fixed on the front housing 40 and the rear housing 50 of the accessory casing through bearings at both ends. [0003] However, due to the length of the transmission chain, bearing clearance and machining errors are likely to cause the gear tooth surface between the heavy-duty wheel 10 and the idler 20 or between the heavy-duty wheel 30 and the idler 20 to wear due to eccentric loads, and due to the The rigidity of the body is insufficient, and the deformation of th...

AI Technical Summary

Problems solved by technology

[0003] However, due to the length of the transmission chain, bearing clearance and machining errors are likely to cause the gear tooth surface between the heavy-duty wheel 10 and the idler 20 or between the heavy-duty wheel 30 and the idler 20 to wear due to eccentric loads, and due to the Insufficient rigidity of the body, the deformation of the shell under heavy load aggravates the wear of the gear under partial load

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