FIELD: mechanical engineering. SUBSTANCE: oval- spherical hollow for a ball is provided on the piston is and ball is received in it to define a closed space which is filled with lubricant. The piston is provided with a device for locking it against rotation with respect to the housing. The device is made up as a ball received in an oval-spherical hollow on the surface of the housing for permitting interaction with longitudinal groove on the piston or as a ball received in the oval-spherical hollow on the surface of the piston that is opposite to the ball received in the curved groove on the cam for permitting interaction with the longitudinal groove on the inner side of the housing. EFFECT: enhanced efficiency. 6 cl, 3 dwg
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