Expansible chamber devices – Piston
Patent
1983-07-05
1988-09-13
Look, Edward K.
Expansible chamber devices
Piston
92242, 92253, F16J 100
Patent
active
047700858
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of Invention
The present invention relates to hydraulic devices and, more particularly, to hydraulic jacks.
The invention can find use in volumetric hydraulic motors with a limited, rectilinear, reciprocating motion of the driven link.
2. Description of the Prior Art
Known in the art is a hydraulic jack comprising a body with passages for supplying working fluid, front and rear covers and a rod mounting a piston placed on a sealing and secured by a nut and a stop (cf. "Hydraulics and Hydraulic Drive of Mining Machines" by P. V. Koval, Moscow, "Machinostroenie" Publishers, 1979, p. 131).
The known hydraulic jacks are disadvantageous in that they employ a great number of different-type parts and units, which complicates their assembly and disassembly.
Also known in the art is a hydraulic jack comprising a body with front and rear covers and a rod which moves relative to the body and carries a piston unit, the latter comprising semi-rings and one or more sealing members (cf. "Hydraulic Jacks" by V. A. Marutov and S. A. Pavlovsky, Moscow, "Machinostroenie" Publishers, 1966, p. 45, FIG. 39). In this hydraulic jack the piston of the piston unit is mounted on the rod with a seal and is secured thereon by a nut and a stop.
These devices are also disadvantageous in that they employ a great number of different-type parts and units which complicates their assembly and disassembly.
SUMMARY OF THE INVENTION
The present invention resides in provision of a hydraulic jack of a design simpler than that of the conventional hydraulic jacks and that requires less labour and time required during its assembly and disassembly.
The task is accomplished by a hydraulic jack comprising a body with front and rear covers and a rod that moves relative to the body and has a piston unit comprising semi-rings and at least one sealing member. According to the invention, the rod has at least one projection made thereon and mounts the sealing member, and at least two grooves that form the respective projection and of which each accomodates semi-rings mounted therein by pairs, the rod portion having the projections and grooves forming the piston unit.
It is expedient to make each semi-ring of a T-shape cross-section.
BRIEF DESCRIPTION OF THE DRAWINGS
The following description of the invention is clarified by examples of its embodiment given with reference to the accompanying drawings, in which:
FIG. 1 shows a hydraulic jack according to the invention with semi-rings of a T-shaped cross-section;
FIG. 2 shows another variant of the embodiment of a hydraulic jack with semi-rings of a square-shaped cross-section, according to the invention;
FIG. 3 is an enlarged view of a semi-ring with one double-action sealing member according to the invention;
FIG. 4 shows the same semi-ring during possible lateral displacements of the rod; and
FIG. 5 is a view taken along arrow A in FIG. 3 of the semi-rings of the piston unit.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
A hydraulic jack comprises a body 1, front 2 and rear 3 covers and a rod 4 which is disposed inside the body 1. The body 1 and the rod 4 are made so that they can move relative to each other. The rod 4 has a portion on which a piston unit 5 is mounted, the latter comprising at least two pairs of semi-rings 6 and sealing members 7 whose number depends on their type.
The rod 4 has lands or projections 8, each of which mounts one sealing member 7, and grooves that form the respective projections 8, the grooves accomodating the guide semi-rings 6 mounted therein by pairs. Thus, the piston unit 5 is formed on the rod 4 portion that has the projections 8 and the grooves, whereby in the design under description there is practically no such part as a piston, which considerably simplifies the design of the hydraulic jack as a whole, as well as its assembly and disassembly.
The body 1 has grooves 9 and 10 used for supplying working fluid. The front cover 2 has a seal 11, and the rear cover has a seal 12.
The rod 4 is provided with a seal 13 and a dirt remover
REFERENCES:
patent: 880361 (1908-02-01), Cook
patent: 2136239 (1938-11-01), Ernst
patent: 2437056 (1948-03-01), Vroman
patent: 3063764 (1962-11-01), Lowery
patent: 3509796 (1970-05-01), Osborne
patent: 4003297 (1977-01-01), Mott
E. L. Carlotta, Synthetic Rubber O-Ring Seals, Jun. 1951, pp. 130-135.
Grigoriev Sergei M.
Sadovsky, deceased Tom P.
Samoilov Vladimir P.
Semenov Alexandr N.
Look Edward K.
Spetsialnoe Konstruktorskotekhnologicheskoe Bjuro Glavmosinzhstr
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