HYDRAULIC-MECHANICAL JAR Russian patent published in 2015 - IPC E21B31/113 

FIELD: mining.

SUBSTANCE: device comprises a tubular housing and a hollow shaft connected by the spline pair. The housing is made of parts, it comprises a first seal and splines at the side of the first edge, and in the middle part - the inner protrusions-anvils. The shaft is made of parts, it comprises a first piston with the first seal, the splines at the side of the first edge of the housing, the strikers between the protrusions-anvils. At the side of the second edge of the housing there is a second piston with the second seal, forming a chamber filled with pressure fluid - oil. The limiting mechanism of the fluid communication with the fluid chamber is made in the form of a belt of greater diameter of the shaft and the annular valve, in which at least one valve device is mounted, restricting fluid flow inside the chamber in one direction. The annular valve is made with a longitudinal stroke equal at least to the longitudinal stroke of the shaft relative to the spring loaded latch mechanism from the start of application of force pushing the shaft into the housing prior to installation of the latch mechanism in the operation position. The latch mechanism is located inside the spline cavity formed by the first piston with the first seal, the splines of the housing, the splines of the shaft and the first seal of the housing at the side of its spline edge. The thrust bush on the edge of the shaft shank is made with a reduced diameter and forms an annular channel between the inner surface of the tubular sleeve and the outer surface of the thrust bush.

EFFECT: increased service life and reliability, uncontrolled activation, piston seizure and seal damage is prevented, emissions of oil are eliminated.

3 cl, 5 dwg