In addition to the advantages of mechanical expansion sleeves, hydraulic expansion sleeves also have their own characteristics

2022-08-03 15:41

(1) Faster installation and removal. Hydraulic expansion sleeve utilizes the characteristics that liquid is difficult to be compressed, and generates high static pressure by compressing the liquid to generate contact pressure between the expansion sleeve and the shaft and the hub to transmit the load. Only one screw is needed to generate the hydrostatic pressure, which improves the installation and disassembly efficiency by at least six times compared with the cone-ring expansion sleeve.

 

 

(2) High positioning accuracy. Because the mechanical expansion sleeve is axially preloaded, an axial force will be generated during preloading, which affects the axial positioning accuracy. When the hydraulic expansion sleeve works, the friction torque and the axial load are transmitted by the contact pressure on the contact surface, which not only improves the axial positioning accuracy, but also has incomparable advantages in some cases where the axial positioning accuracy is high.

 

 

(3) Save axial space. Through the research on the structure and usage of the shaft-hub connection element, the hydraulic expansion sleeve breaks through the limitation of the existing expansion sleeve structure concept, and designs a flange end that can accommodate the pressure regulating screw and the pressure regulating piston, so that it can be used in the The installation and removal of the expansion sleeve is completed in the radial direction of the expansion sleeve, and there is no need to reserve an axial operating space for the expansion sleeve.

(4) The radial runout is small. The mechanical expansion sleeve is composed of an inner sleeve with a tapered surface and an outer sleeve, while the hydraulic expansion sleeve is a completely integrated structure, which greatly reduces the radial runout of the hub during operation.

Through the above, we can realize that the hydraulic expansion sleeve has good cost performance and mechanical advantages, and has its own unique advantages in design, use and disassembly. It will definitely appear in the transmission field in large numbers. 

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