Variable-tooth and variable-gap type magnetic fluid reciprocating sealing structure for hydraulic cylinder
A sealing structure and magnetic fluid technology, applied in the direction of engine sealing, fluid pressure actuating device, engine components, etc., can solve the problems of wasting cost, increasing the volume of magnetic fluid sealing structure, etc., and achieve the effect of improving the sealing pressure resistance performance
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[0032] Such as Figure 1-3 As shown, a variable-tooth variable-gap magnetic fluid reciprocating sealing structure for hydraulic cylinders includes a hollow housing 2 with one end closed and the other open. A through hole is opened in the center of the closed end surface of the housing 2. It also includes a piston rod 1 penetrated from the through hole to the inner cavity of the housing 2.
[0033] A plurality of annular pole shoes 3 are arranged in the space between the outer surface of the piston rod 1 and the inner wall of the housing 2 along the axial direction. The pole shoe 3 is provided with pole teeth 6 on the inner circular surface. An axially magnetized permanent magnet ring 7 is sandwiched between two adjacent pole shoes 3.
[0034] The cross section of the pole shoe 3 closest to the closed end of the housing 2 and the pole shoe 3 closest to the open end of the housing 2 are both L-shaped, and the axial extensions 31 of the two pole shoes 3 are opposite to each other. ...
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