Shrinkage fit connecting method of worm-gear and leadscrew nut for electric cylinder

Abstract

The invention relates to a method for connecting a worm wheel of an electric cylinder and a feed screw nut through shrinkage fit in the technical field of mechanical engineering. The method adopts shrinkage fit for connection; the worm wheel in the electric cylinder is directly and fixedly connected with the feed screw nut: step one, a copper worm wheel is put into a resistance furnace, and the temperature of the resistance furnace is set to between 190 and 210 DEG C; step two, a temperature measuring sensor is put on the copper worm wheel for measuring the temperature of the copper worm wheel, and when the temperature of the copper worm wheel rises between 190 and 210 DEG C, the the inside diameter of a copper worm wheel hole is expanded to reach requirement of shrinkage fit; step three, the worm wheel is sleeved with the feed screw nut, and in the sleeve process, the clearance amount between the feed screw nut and the worm wheel is kept even; and step four, when the worm wheel enters a setting position, the power supply of the resistance furnace is closed so as to cool and position the worm wheel and the feed screw nut. Compared with the prior bond connection and bolt connection, the shrinkage fit connection can improve transferring precision of the electric cylinder, save materials, reduce the machining procedures, increase the transferred torsion and improve performance of the electric cylinder.

Description

technical field [0001] The invention relates to a method for connecting transmission parts in the technical field of mechanical engineering, in particular to a method for connecting a worm wheel for an electric cylinder and a screw nut red sleeve. Background technique [0002] Many electric cylinders use worm gear reducers to achieve deceleration and increase torque. There are two connection methods between the worm gear and the lead screw nut of the existing electric cylinder: key connection and screw connection. The disadvantage of using a key connection is that there is a gap between the key and the keyway, which causes a relative displacement between the worm wheel and the screw nut. For the ball screw transmission device that requires high positioning accuracy, such a relative displacement will affect the transmission accuracy. , In addition, the keyway will produce plastic deformation after working for a long time, resulting in a further decline in positioning accuracy...

AI Technical Summary

Problems solved by technology

The disadvantage of using a key connection is that there is a gap between the key and the keyway, which causes a relative displacement between the worm wheel and the screw nut. For the ball screw transmission device that requires high positioning accuracy, such relative displacement will affect the transmission accuracy. , in addition, the keyway will produce plastic deformation after working for a long time, resulting in a further decline in positioning accuracy

Although it mentions the red sleeve method, it has two obvious differences from this invention; one: the application field is different, the method is applied to large-scale equipment, and cannot be applied to the electric cylinder field; The red sleeve method applied to the connection between the main shaft and the rotor, not for the connection between the turbine and the screw nut

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