Transmission gear of automobile instrument motor

Abstract

The invention discloses a transmission gear of an automotive instrument motor, which comprises a motor driven pinion, a middle gearwheel, a middle pinion and an output gearwheel. The middle gearwheel and the middle pinion are coaxial gears, the driven pinion and the middle gearwheel are meshed, the middle pinion and the output gearwheel are meshed, the driven pinion and the middle pinion have the same outline structure and are named as pinions, the middle gearwheel and the output gearwheel have the same outline structure and are named as gearwheels, the outline lines of the pinions are curves which are symmetrical along an axis OA and consist of six sections of tangential circular arcs, and the outline lines of the correspondingly meshed gearwheels are curves which are symmetrical along an axis OE and consist of five sections of tangential circular arcs; and the pinions and the gearwheels are meshed to work. The transmission speed ratio of the transmission gear is large and can reach 30 to 1; the tooth number of the pinions can be six so as to ensure a small integral structure; and when the gearwheels and the pinions are in meshed transmission, the transmission is smooth, and the vibration and noise are low.

Description

technical field [0001] The invention belongs to gear transmission technology, in particular to a tooth profile structure for gear transmission of an automobile meter motor. Background technique [0002] Gear transmission is the most widely used basic transmission form in various mechanical transmissions. It relies on the teeth of the driving wheel to push the teeth of the driven wheel in turn to transmit motion and power, and can transmit the rotary motion between any parallel shafts, intersecting shafts and staggered shafts. The tooth profile of the gear mainly includes involute, arc, double arc, cycloid and quasi-hyperbola. The involute gear has the characteristics of constant rotation ratio and low noise and jitter, but the minimum number of small teeth is 12 teeth, so that The structural dimensions of the reduction drive system become very large. The corrected cycloidal gear tooth profile for standard clocks and watches allows the number of small teeth to be 6, but the...

AI Technical Summary

Problems solved by technology

The tooth profile of the gear mainly includes involute, arc, double arc, cycloid and quasi-hyperbola. The involute gear has the characteristics of constant rotation ratio and low noise and jitter, but the minimum number of small teeth is 12 teeth, so that The size of the reduction drive system becomes very large

The modified cycloidal gear tooth shape for standard clocks and watches allows the number of small teeth to be 6, but the reduction ratio is not constant during the transmission process, which will cause jitter and noise

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