Electronic-control backlash eliminating gear pair with variable tooth thickness

Abstract

The invention discloses an electronic-control backlash eliminating gear pair with variable tooth thickness. The gear pair comprises a tooth thickness variable gear I, a tooth thickness variable gear II and an electronic-control backlash eliminating system, wherein the tooth thickness variable gear II is meshed with the tooth thickness variable gear I, the electronic-control backlash eliminating system comprises at least an electronic-control power device used for exerting backlash-regulating axial mechanical force on the tooth thickness variable gear I and the tooth thickness variable gear II, and the direction of the backlash-regulating axial mechanical force is a direction for backlash elimination between the tooth thickness variable gear I and the tooth thickness variable gear II. According to the gear pair, real-time control of axial displacement is achieved through electronic control, then the tooth backlash can be regulated in real time according to backlash regulation requirements, the response is rapid, the transmission accuracy is improved, the volume is small, the structure is simple, the synchronism requirement for control is low, the cost is low, the assembling requirements are easy to satisfy, the tooth backlash and the return difference can be eliminated or reduced timely, the transmission error during reversing can be reduced, therefore the operation and the control are simple and fast, and high adaptability is provided at occasions with high requirements for the integral structure.

Description

technical field [0001] The invention relates to a variable tooth thickness gear meshing pair, in particular to a variable tooth thickness gear meshing pair used for backlash elimination by external mechanical force. Background technique [0002] Gear transmission is used for the transmission of motion and force between two shafts. Compared with other mechanical transmission methods, gear transmission has stable motion, compact structure, low noise and high transmission efficiency. It is widely used in various machines and instruments. Applications. [0003] With the development of science and technology and production technology, as well as people's high-quality requirements for various products, especially the development of precision transmission, higher and higher requirements are put forward for the adjustment and control of transmission accuracy and backlash. [0004] The backlash mainly affects the accuracy of gear transmission; in the prior art, in precision gear tra...

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Problems solved by technology

[0004] The backlash mainly affects the accuracy of gear transmission; in the prior art, in precision gear transmission, in order to realize backlash-free transmission and adjust meshing backlash, commonly used backlash adjustment methods include: eccentric bushing adjustment center distance method, spring force bias method, spring-loaded scissor gear, dual-motor-driven double-transmission chain anti-backlash method, auxiliary torque motor loading method, etc., the above-mentioned gap adjustment methods or existing structure and assembly are relatively complicated, and are only applicable to low-power systems, often only It can eliminate the shortcomings of a certain constant hysteresis; or it has the disadvantages of occupying a large space and wasting driving energy; for example, the dual-motor-driven double-drive chain anti-backlash method and the auxiliary torque motor loading method introduce motors for gap adjustment. The backlash effect is relatively ideal, but the cost is high, and the requirements for the control system are also relatively high. The double-drive anti-backlash method driven by dual motors takes up a relatively large space, and has high requirements for control synchronization, and increases the driving energy.

[0005] The simpler method is to use variable-tooth-thickness cylindrical gears plus spring gap adjustment, etc., through the pre-tightening force of the springs, the gears can move axially to a certain extent, eliminating the tooth backlash, which has a high impact on the machining accuracy of the gears. Requirements, it is difficult to adjust the size of the spring preload

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