| 摘要 |
The invention relates to a piston assembly of a hydraulic radial piston-type machine, an essential characteristic thereof being the arrangement of a rolling element (2) in a piston head. This means that the portion of contact surface of the rolling element (2) lying close to a crown (8) of the piston (1) is always arranged in the area between the piston crown (8) and a step (7) extending radially inwards and dividing the head (4) of the piston (1) from the guide portion (5).
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