A wheel train harmonic reducer

Abstract

The invention discloses a gear train harmonic reducer which comprises a front fixed frame, a shell, an input shaft, an output shaft, a chain ring, small chain wheels, a rotary frame, small gears and arear fixed frame. A tooth disc is arranged on the front fixed frame, the front fixed frame is fixedly connected with power output equipment, and the front fixed frame and the rear fixed frame are welded into a whole. The three small gears are evenly distributed and mounted on the rear fixed frame. The input shaft is mounted in the center of the rear fixed frame and forms a rotary pair. The chainring is mounted between the small chain wheels and inner tooth discs. A fixed shaft gear train is formed by the input shaft, the three small gears and the rotary frame. The input shaft rotates, the rotary frame is driven through the small gears to rotate, and the drive ratio of the input shaft and the rotary frame is i1. The three small chain wheels are driven by the rotary frame to rotate and serve as a wave generator in the harmonic reducer, and a harmonic reduction device is formed by the wave generator, the chain ring, the output shaft and tooth discs on the front fixed frame and the rearfixed frame. The drive ratio of the rotary shaft and the output shaft is i2, and the drive ratio of the input shaft and the output shaft is i=i1*i2.

Description

technical field [0001] The invention relates to the field of mechanical reduction transmission, in particular to a gear train harmonic reducer. Background technique [0002] Harmonic gear transmission has the advantages of large transmission ratio, high transmission precision, good stability, simple structure, light weight and small volume. Harmonic gear transmission is based on the mechanical harmonics generated by the radial deformation of the thin-walled cylindrical flexible spline to transmit motion and power, and the fatigue fracture caused by the excessive bending stress of the thin-walled cylindrical flexible spline is the main cause of this transmission. The failure mode, the bending stress in the flexspline is proportional to the radial deformation and wall thickness, the radial deformation of the flexspline is related to the transmission ratio, the smaller the transmission ratio, the greater the radial deformation, the shorter the life of the transmission, and the ...

AI Technical Summary

Problems solved by technology

Harmonic gear transmission is based on the mechanical harmonics generated by the radial deformation of thin-walled cylindrical flexible splines to transmit motion and power. Among them, the fatigue cracking of thin-walled cylindrical flexible splines caused by excessive bending stress is the main cause of this transmission. In the form of failure, the bending stress in the flexspline is proportional to the radial deformation and wall thickness, and the radial deformation of the flexspline is related to the transmission ratio. The smaller the transmission ratio, the greater the radial deformation, and the shorter the life of the transmission. As the wall thickness of the wheel increases, the bending stress increases and the service life decreases. On the contrary, the wall thickness decreases, the stiffness of the flex spline decreases, the stress concentration of the gear teeth increases, and even the gear teeth interfere, which aggravates the failure of the transmission device.

[0003] The strength and life of the flexwheel are also related to its material and processing technology. Usually, it is necessary to use high-quality alloy steel, and carry out quenching and tempering, nitriding, carburizing and shot peening, and strictly control the dimensional accuracy, shape accuracy and Surface quality, it can be seen that the manufacturing process of the harmonic gear transmission is quite complicated, the manufacturing cost is high, and it is difficult for ordinary manufacturers to meet its technical requirements

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