Double deep groove ball bearing pre-tightening eccentric cam follower

Abstract

The double-deep-groove-ball-bearing pre-tightening eccentric cam follower is simple in structural form, high in rigidity, small in rolling friction coefficient, stable in transmission and convenient to install. According to the technical scheme, an eccentric wheel shaft (1) provided with a flange rocker arm base and a cantilever shaft is adopted, an adjusting ring (3) is clamped between an upper deep groove ball bearing (4) and a lower deep groove ball bearing (2) through the cantilever shaft diameter of the eccentric wheel shaft, the upper deep groove ball bearing fixes the adjusting ring (3) in a bearing seat through an outer ring, and a closed structure is formed. And the screw (6) axially passes through the through hole of the pre-tightening cover (5) and is tightened into the threaded hole of the cantilever of the eccentric wheel shaft, so that the double-deep-groove ball bearing is pre-tightened in the cantilever shaft of the wheel shaft. The problems that in the prior art, a thread part is prone to breakage, a cam follower is used for being matched with a nut, enough screwing torque is difficult to obtain, a fixed end is prone to loosening, bending stress is concentrated, and a rod end is damaged at the thread part of a bearing are solved.

Description

technical field [0001] The invention relates to a precision mechanical transmission mechanism, in particular to a cam follower support mechanism of the precision mechanical transmission mechanism. Background technique [0002] Cam mechanism is an important transmission mechanism, which is widely used in various machines. The center of the base circle of the cam does not coincide with the center of rotation of the cam after installation, and the motion trajectory and maximum stroke can be changed by adjusting the cam profile. The eccentric wheel is also a kind of cam. The eccentric wheel means that the center of the wheel is not on the rotation point. It generally refers to a circular wheel. When the circle does not rotate around its own center, it becomes an eccentric wheel. In the electromechanical coupling system of precision transmission, the transmission cam has a low tolerance to the transmission parts and has high requirements on the processing technology of the parts...

AI Technical Summary

Problems solved by technology

When tightening the tightening nut of this type of cam follower, if the tightening torque exceeds the maximum tightening torque range, or the tightening torque is too large, sometimes the threaded part of the rod end will be broken. , it is difficult to obtain sufficient tightening torque. If the fixed end becomes loose, the rod end will be damaged due to the concentration of bending stress on the bearing thread.

[0005] In the field of precision transmission, when the bearing is used as a cam supporting follower mechanism, a single deep groove ball bearing has clearance as a cam rotating part. After the inner ring of the bearing is fixed, it is subjected to radial and axial loads at the same time, and the outer ring will slightly move up and down. The situation of moving will interfere with the closed loop of high-agility servo motion and affect the transmission accuracy

The servo mechanism will be affected by the vibration of the external environment in the actual working state. Due to the existence of the clearance, the impact of the vibration on the bearing and the active mechanism will be amplified, and the static motion state will be changed into a dynamic impact state, making the contact between the two The surface is damaged and becomes rough, and the motion is discontinuous, which affects the motion accuracy of the entire structure

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