Backlash-free gear transmission pair

Abstract

The invention discloses a backlash-free gear transmission pair. A gear adopts gradually-varied tangential displacement, tangential displacement coefficients change in the gear disc axial direction according to a definite law from small to large to enable two tooth faces of gear teeth to form a certain included angle, a driving gear and a driven gear are respectively provided with axial pre-tightening force identical to the gear teeth in the front-thick-to-thin direction, and meshing backlashes can be adjusted by adjusting the axial relative positions of the meshed gears. The driving gear or the driven gear is prevented from retreating by utilizing the axial pre-tightening force, so that reverse axial force is exerted to eliminate return difference in the transmission process and enable the process to be tender, pause is avoided, and the backlash-free gear transmission pair has the advantages of being simple in structure, small in size and the like. The tangential displacement influence on tooth thickness can be avoided by utilizing a radial displacement mode, the gear tooth strength is ensured, increase of the meshing contact ratio is facilitated, the bearing capacity is high, and the backlash-free gear transmission pair is suitable for high-speed input during precise transmission.

Description

technical field [0001] The invention relates to a transmission device, in particular to a transmission device with high precision requirements. Background technique [0002] Gear transmission is used to transmit motion and power between two shafts. Compared with other mechanical transmissions, gears have the advantages of compact structure, stable operation, and low noise, so they are widely used in various machines and instruments. [0003] [0004] With the development of production technology and the demand for high-quality products, especially the development of precision heavy-duty transmission, higher requirements are put forward for the control of transmission accuracy and backlash. [0005] Existing technology In precision gear transmission, in order to achieve anti-backlash transmission or adjust meshing backlash, commonly used technical solutions include: eccentric bushing adjustment center distance method, double-piece thin gear staggered tooth adjustment method,...

AI Technical Summary

Problems solved by technology

[0005] Existing technology In precision gear transmission, in order to achieve anti-backlash transmission or adjust meshing backlash, commonly used technical solutions include: eccentric bushing adjustment center distance method, double-piece thin gear staggered tooth adjustment method, spring force bias method, double The motor-driven double transmission chain anti-backlash method, the above methods are complicated in structure and assembly, high in cost, only suitable for small power systems, and cannot completely solve the backlash problem of gear transmission

There are also methods such as conical variable tooth thickness gears that adopt radial displacement, such as U.S. Patents US3174356, US3171212 and US5400672. The axial direction is constantly changing, which will directly increase the wear of the gear, and its precision machining is also more troublesome, requiring modification of the machine tool, and poor manufacturability

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