公开(公告)号：US06276261B1

公开(公告)日：2001-08-21

申请号：US09269198

申请日：1999-03-30

Applicant: Jurij Manfreda

Inventor： Jurij Manfreda

IPC: F16J120

CPC classification number: F04B1/0408 ,  F01B1/0644 ,  F04B1/0439 ,  F16J1/10

Abstract: A piston assembly of a hydraulic radial piston-type machine, an essential characteristic thereof being the arrangement of a roller element in a piston head. The portion of contact surface of the roller element lying close to a crown of the piston is always arranged in the area between the piston crown and a step extending radially inwards and dividing the head of the piston from the guide portion.

Abstract translation: 一种液压径向活塞式机器的活塞组件，其主要特征是滚子元件在活塞头中的布置。 靠近活塞顶部的滚子元件的接触表面的一部分总是布置在活塞顶部与径向向内延伸的台阶之间的区域中，并将活塞的头部与引导部分分开。

公开(公告)号：US06834575B2

公开(公告)日：2004-12-28

申请号：US10221948

申请日：2002-12-02

Applicant: Jurij Manfreda

Inventor： Jurij Manfreda

IPC: F01B106

CPC classification number: F04B1/0408 ,  F01B1/0644 ,  F03C1/0406 ,  F03C1/0636 ,  F04B1/1071

Abstract: The invention refers to a piston assembly for a radial piston hydraulic motor. The essence of the solution lies in that a longitudinal axis (12) of a roller (11) substantially coincides with an axis through centre of gravity of a piston body (2). The roller is placed in a bed (10) of a bearing bush (6) which is located inside the piston (1) in a manner that the edges thereof slip through grooves (14) in the lower inner portion of the piston (1). The roller (1) being inserted this way is afterwards rotated in a certain angle, together with the bearing bush (6), thus, preventing the roller (11) from falling out of the piston (1).