Multi-line planetary traction and transmission type speed reducing bearing

Abstract

The invention discloses a multi-line planetary traction and transmission type speed reducing bearing. An inner ring, an outer ring and rolling bodies of the speed reducing bearing form a planetary traction and transmission gear train jointly and serve as a sun gear, an outer ring and a planetary gear of the planetary traction and transmission gear train correspondingly. According to the planetary traction and transmission type speed reducing bearing, radial supporting of a shaft is achieved by means of the positive pressure between the contact surfaces of the inner ring, the rolling bodies and the outer ring, and movement and power are transmitted by means of the friction force between the contact surfaces of the inner ring, the rolling bodies and the outer ring. The speed reducing bearing integrates the speed reducing function and the bearing function, and at least two lines of rolling bodies are arranged in the axial direction. An intermediate planetary carrier is arranged between every two adjacent lines of rolling bodies, wherein wheel shafts of the two adjacent lines of rolling bodies are connected through the intermediate planetary carrier. The rolling bodies in every two adjacent lines are evenly arranged in a staggered mode in the circumferential direction. According to the speed reducing bearing, the multiple lines of rolling bodies rotate, so that the contact between the rolling bodies, the inner ring and the outer ring is uniform in the circumferential direction and the axial direction, an inner ring shaft can be well supported, and the contact stress of the rolling bodies in the working process can be reduced; meanwhile, the torsional rigidity of a shaft system of the rolling bodies is high so that the torsional deviation of the shaft system of the rolling bodies can be effectively reduced in the transmission process, the situation that a speed reducer is disturbed or gets stuck during the transmission work can be effectively avoided, and the transmission quality and efficiency are improved.

Description

technical field [0001] The invention relates to the field of planetary reducers, in particular to a multi-row planetary traction drive reduction bearing. Background technique [0002] In the existing planetary traction reducer, the friction between the sun gear, the planetary wheel and the outer ring contact surface can be used to transmit motion and power to realize planetary friction wheel transmission. This kind of reducer is simple in structure, stable in operation, and overload Can be skid and other advantages, with a larger application. According to whether there is lubricant between the contact surfaces, it is divided into wet friction and dry friction transmission. Dry friction transmission often has low transmission efficiency and small transmission power. In wet friction transmission, the sun gear, planetary gear, and outer ring are surface hardened, and work in a lubricant with a high pressure viscosity index. The contact area produces a lubricating film with hig...

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Problems solved by technology

In the prior art, in order to increase the transmission ratio of the planetary traction reducer, it is necessary to increase the ratio of the diameter of the planetary gear to the sun gear, so that due to geometric interference, the number of planetary gears arranged as bearing rollers is reduced, and the outer ring and the sun gear are reduced. The radial support points of the sun gear will become less and sparse. On the other hand, to increase the transmission torque, it is necessary to increase the pressing force. In order to ensure that the stress on the contact surface does not exceed the strength limit of its material, the sun gear will inevitably increase. The axial length of the sun gear, planetary gear, and outer ring will cause uneven surface contact and torsional deformation of the planetary gear, which will further damage the surface contact and engagement of the sun gear, planetary gear, and outer ring, and cause springing during high-speed rotation. The radial velocity loss of the flow lubrication film reduces the efficiency. One way to solve this problem is to set the planetary gears in multiple rows, thereby increasing the contact area between the planetary gears and the outer ring and the sun gear. The multi-row planetary gears pass through a The planetary shaft is connected to the output of the planetary carrier. When the reducer of this structure is transmitting, the planetary carrier bears the reaction torque, thereby applying a torque to the planetary shaft, and then making the axis of the planetary shaft and the axis of the sun gear non-parallel and forming a deflection angle. Under the same declination condition, the longer the length of the planetary gear shaft, the greater its offset, which will easily cause the planetary gear shaft to interfere or even get stuck, which will eventually lead to reduced working quality and efficiency of the reducer, or even damage

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