Upper die for press-fitting of fan rotor and motor shaft

Abstract

An upper die for press-fitting of a fan rotor and a motor shaft comprises a steel upper die body (1), wherein the upper die body (1) is provided with an axial through hole (1.1), the axial through hole (1.1) is internally provided with a combined rubber tube in a sleeving way, the combined rubber tube is formed by an inner-layer soft rubber tube (2.1) and an outer-layer hard rubber tube (2.2), the inner-layer soft rubber tube (2.1) and the outer-layer hard rubber tube (2.2) are formed by injection molding with an injection mold, the outer side wall of the outer-layer hard rubber tube (2.2) is provided with multiple axial raised ribs (2.21) distributed along the circumference, and the inner side wall of the axial through hole (1.1) of the upper die body (1) is provided with multiple clamp slots clamped and matched with the axial raised ribs (2.21) one by one. By adopting the upper die, the motor shaft can be effectively prevented from being worn and scratched.

Description

technical field [0001] The invention relates to the technical field of press-fitting of fan rotors and motor shafts, in particular to an upper mold for press-fitting fan rotors and motor shafts. Background technique [0002] In the press-fitting process of the fan rotor and the motor shaft, in order to make the motor shaft tightly fit in the center shaft hole of the fan rotor, the entire motor shaft is not made into a structure that is tightly fitted to the center shaft hole. And just stamping out on the outer peripheral wall of the tightly fitting section of the motor shaft a plurality of punching ribs arranged in the circumferential direction, so that the diameter of the tightly fitting section of the motor shaft is greater than the inner diameter of the central shaft hole to form a tight fit with the central shaft hole. The diameter of other shaft sections of the motor shaft is smaller than the inner diameter of the central shaft hole to form a clearance fit with the cent...

AI Technical Summary

Problems solved by technology

[0004] When the mold with the above structure is used to press-fit the fan rotor and motor shaft, in order to withstand the pressure of the punch of the punching machine, the upper mold is made of steel material as a whole. Although the bearing strength is high, the overall hardness is also very high. The high-hardness upper mold will definitely wear and scratch the low-hardness motor shaft during assembly, and once the motor shaft is worn and scratched, the motor shaft and the bearing will produce loud noise, and the noise is fatal to the fan. One of the disadvantages seriously affects the overall quality of the fan

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