TELESCOPIC DOUBLE-ACTING HYDRAULIC MOTOR Russian patent published in 2011 - IPC F15B15/16 

FIELD: machine building.

SUBSTANCE: hydraulic motor consists of case of first step wherein there is installed hollow rod of first step performing reciprocating motions relative to case of first step. The case of the second step is installed into a cavity of the rod of the first step. On ends of the case of the second step there are made lugs conjugating with an internal wall of the rod of the first step. The piston of the first step is secured on the case of the second step. In the case of the first step this piston forms before-the piston and after-the piston cavities closed with covers of the first step. A complex hollow rod of the second step is positioned in the case of the second step; this rod performs reciprocating motions relative to case of the second step. The piston of the second step made like a solid uniform body forms before-the piston and after-the piston cavities covered with covers of the second step in the case of the second step. The telescopic double-acting hydraulic motor also contains radial and axial channels for supply of working fluid under pressure through them and a journal secured on an external side of the case of the first step by means of an attachment point. The journal can be removed and sized for packing elements made on conjugated surfaces.

EFFECT: raised reliability.

2 dwg