Hydraulic push-pull device with automatic pressure relief function for interference fit assembly and disassembly of shafts and holes

Abstract

The invention discloses a hydraulic push-pull device with the automatic pressure relief function for interference fit assembly and disassembly of shafts and holes. The hydraulic push-pull device comprises a push-pull device body and a stiff piston; the push-pull device body is cylindrical, a step hole comprising a large hole and a small hole is formed in the push-pull device body, a pushing oil injection hole communicated with the step hole is formed in the push-pull device body and is located at the junction of the large hole and the small hole, and a plurality of pushing oil drainage holes are formed in the push-pull device body, are communicated with the large hole of the push-pull device body and are provided with sealing plugs. According to the invention, pushing oil is guided into the pushing oil injection hole through a high-pressure oil pump and acts on the stiff piston, the stiff piston is driven to move, then shaft parts are driven to move, the pushing oil drainage holes output the oil when hole parts reach the matching position, the oil pressure in the hydraulic push-pull device is approximate to zero, interference fit connectors of the shafts and the holes keep static, and the problems of over-assembly caused by excessive axial pushing-in distance and secondary assembly caused by insufficient axial pushing-in distance can be avoided.

Description

technical field [0001] The invention relates to a hydraulic push-pull device for assembly and disassembly of shaft hole interference fit with automatic pressure relief function, which belongs to the field of diesel engine crankshaft shock absorber assembly. Background technique [0002] At present, the research and application of hydraulic assembly and disassembly technology at home and abroad have been relatively mature, mainly used in hydraulic assembly and disassembly of propellers, crankshaft shock absorbers, etc. Using hydraulic pressure to assemble and disassemble the parts with interference fit, because the hydraulic pressure is easy to control and the lubrication of the oil film not only saves time, but also is safe and reliable, reducing the risk of friction damage between parts. However, during hydraulic assembly, since the axial push-in distance is difficult to monitor, when the axial push-in force is applied, it is easy to cause over-fitting due to too much axial...

AI Technical Summary

Problems solved by technology

However, during hydraulic assembly, since the axial push-in distance is difficult to monitor, when the axial push-in force is applied, it is easy to cause over-fitting due to too much axial push-in distance or insufficient axial push-in distance. Carry out secondary assembly and other issues

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