Clearance-free planetary drive device

Abstract

The invention discloses a clearance-free planetary drive device. The outer circle of an eccentric bushing is sheathed with a double external gear in running fit. One external gear of the double external gear is meshed with a fixed pin gear in a way with small teeth difference, and the other external gear thereof is meshed with a power output pin gear in a way with small teeth difference. The pin teeth of the fixed pin gear and the power output pin gear respectively comprise a roller wheel structure which can rotate around the axis thereof. The tooth profile curves of teeth of the two externalgears of the double external gear are respectively formed by the enveloping of the surfaces of outer circles of the fixed pin gear and the power output pin gear which are meshed with the external gears. The external gears and the roller wheel form a pure rolling meshing structure, thus avoiding sliding friction between the meshed gear teeth; as for the clearance-free planet gear, the teeth of thedouble gear are all contacted with the teeth of the fixed pin gear and the power output pin gear, therefore, the clearance-free planet gear is characterized by zero drive error and zero return difference; and the clearance-free planetary drive device has high precision, low noise, high drive efficiency and long service life.

Description

technical field [0001] The invention relates to a planetary transmission device, in particular to a gapless planetary transmission device. Background technique [0002] Eliminating meshing backlash, reducing transmission noise and improving transmission efficiency are difficult problems for gear transmission. The small tooth difference planetary reducer has the advantages of stable transmission and large transmission ratio, but because it still uses gear meshing pair transmission, it also has the problem of eliminating backlash, especially for precision transmission devices, the elimination of backlash is particularly important. [0003] In order to solve the problem of eliminating the backlash of the precision transmission system, a double-disc conical cycloidal planetary transmission device has appeared. The conical cycloidal planetary gear is located in the main body and mounted on the bearing in the middle of the eccentric shaft. The same as the cone angle The conical i...

AI Technical Summary

Problems solved by technology

Theoretically, this device can realize backlash-free meshing transmission, but due to the inevitable relative sliding between the meshing teeth, the backlash will increase friction and reduce work efficiency in actual operation, so it cannot be realized. The complete elimination of backlash will lead to problems such as relatively large vibration, noise, reactive power consumption and reduced transmission efficiency of mechanical equipment, which will make the transmission accuracy and reliability of the mechanism poor; the existence of sliding will also cause serious wear of the gear teeth and shorten the mechanism. service life, increase the cost of use and maintenance

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