A coupling press-fitting device and press-fitting method

Abstract

The invention relates to a coupling press-fitting device and a press-fitting method, which are used for press-fitting a shaft coupling with a bushing onto a central shaft, including a press-fit component and a press-fit power component, the press-fit power component The output end of the press-fit assembly is in contact with the press-fit assembly, and the press-fit assembly is configured to be in rigid contact with the bushing while elastically contacting the end face of the coupling during the press-fit process, so as to transmit axial force to the bush and the coupling respectively , in a natural state, the press-fit surface of the press-fit assembly that elastically contacts the coupling protrudes beyond the press-fit surface that rigidly contacts the bushing. According to the invention, when the bushing is forced to move inward, the coupling will not be displaced relative to the bushing under the action of the elastic thrust, which can ensure the installation requirements of the end face of the coupling joint and the end face of the bushing, and reduce the coupling It can improve the quality and efficiency of press-fitting of the coupling by reducing the rework during press-fitting, and at the same time, it is beneficial to save the extra cost of replacing the bushing.

Description

technical field [0001] The invention relates to an assembly tool, in particular to a press-fitting device and a press-fitting method for a coupling with a bushing, and belongs to the technical field of rail vehicle manufacturing. Background technique [0002] For the drum-shaped gear coupling in the prior art, the motor and the small shaft of the gearbox are connected with a taper of 1:50. At present, the oil injection and press-fitting method is generally used for the assembly of the coupling. Specifically, it includes injecting oil into the oil injection hole of the central shaft, forming an oil film around the central shaft, using the hydraulic jack to provide axial thrust, and the press-fit surface of the press-fit gasket contacts the end surface of the bush to push the coupling in the axial direction , until the end face of the press-fit gasket abuts against the end face of the central shaft. [0003] There are following problems in existing press-fitting method: as f...

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Problems solved by technology

[0003] There are following problems in existing press-fitting method: as figure 1 As shown, the existing press-fit gasket 1 is rigid. Due to the misalignment between the end surface of the coupling 2 and the end surface of the bush 3 (the end surface of the bush 3 should be 0.1-0.5mm higher than the end surface of the coupling 2), the When installing the initial position, the rigid press-fit gasket 1 first contacts the bushing 3, and as the pressure increases, the rigid press-fit gasket advances forward, causing the bush 3 to move inward under force first, thereby causing the bush 3 to There is a large misalignment with the coupling 2, and the rigid press-fit gasket 1 does not come into contact with the coupling 2 until the bushing 3 is advanced until its end surface is flush with the end surface of the coupling 2

At the same time, if figure 2 As shown, after the bushing 3 and the coupling 2 are pressed into place together, the press-fit gasket 1 is in close contact with the end face of the coupling 2, the end face of the bushing 3, and the end face of the central shaft 4 at the same time, so that the end face of the bushing 3 It is flush with the end face of the coupling 2, and does not meet the final requirement that the end face of the bushing 3 should be 0.1-0.5mm higher than the end face of the coupling 2 after the coupling is pressed into place, and causes the position of the big end of the bushing 3 to be in line with the coupling Section 2 is misaligned, destroying the normal relative position of coupling 2 and bushing 3, causing the sealing ring 5 on bushing 3 to be exposed

The existing press-fitting method not only increases the additional cost caused by the damage of the bushing 3 due to the relative misalignment between the coupling 2 and the bushing 3 and needs to be replaced, but also the quality of the coupling after press-fitting cannot be guaranteed. At the same time, due to quality defects caused by poor press-fitting, multiple reworks are often required, resulting in low production efficiency

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