SU1093258A3 - Radial piston hydraulic machine - Google Patents

Abstract

A CRABIAL PISTON HYDRAULIC MACHINE containing a cylinder block and piston groups including pistons and H-shaped supporting shoes hingedly mated with them, installed with the ability to interact with the supporting surfaces of the ring ring that surrounds the cylinder block and has an annular groove located between the supporting surfaces and made symmetrically with respect to the plane of the axes of the cylinders, which is the plane of rotation of the cylinder block, in order to reduce ceiling elements pressure piston on the cylinder wall and improve the self-aligning piston, each piston is provided with radially disposed in the plane of arrangement of the axes of cylinders cantilevered projections, partially covering the supporting shoe and the continuing lateral surface of the piston and the supporting shoe holders, fixed on the console ledges of said piston. 2. The hydraulic machine as claimed in claim 1, in which the ends of the cantilever projections of the piston protrude into the annular groove towards the ring. from 00 tc SP 00

Description

FIELD OF THE INVENTION The invention relates to hydraulic engineering, in particular to radial piston hydraulic machines.

A radial-piston hydraulic machine is known, comprising a rotating cylinder block with piston groups including pistons and H-shaped supporting shoes hingedly coupled to them, having in the contact zone with the supporting surfaces of the guide ring of the hydrostatic load chamber P. J.

However, in the well-known radial piston hydraulic machine, the contact shoe of the piston group can contact the cylinder wall, which is caused by insufficiently reliable self-installation of the support shoe during the operation of the hydraulic machine.

Also known is a radial piston hydraulic machine comprising a cylinder block with piston groups including pistons and H-shaped support shoes mounted with hinges that are mounted to interact with the supporting surfaces of the guide ring enclosing the cylinder block and having an annular groove located between bearing surfaces and made symmetrical about the plane of the axes of the cylinders, which is the plane of rotation of the cylinder block 2).

When operating at high pressure levels in a known hydraulic machine, the specific pressure of the piston against the wall of the cylinder increases significantly due to the insufficiently developed lateral surface of the piston, which limits the scope of application of the hydraulic machine. This hydromachine eliminated the contact of the support shoe with the wall of the cylinder, however, the gaps in the interfaces between the support shoe, the cylinder block and the piston were increased, which somewhat impairs the self-installation of the piston group.

The aim of the invention is to reduce the specific pressure of the piston on the wall of the cylinder and to improve the self-installation of the piston group.

The goal is achieved by the fact that in a radial piston hydraulic machine containing a cylinder block with piston groups, including pistons and H-shaped support shoes hinged to them, mounted with

the possibility of interaction with the bearing surfaces of the guide ring enclosing the cylinder block and having an annular groove located between the bearing surfaces and made symmetrical with respect to the plane of the axes of the cylinders, is the plane of rotation of the cylinder block, each piston is provided with cantilevered cylinders located radially in the plane of the axes of the cylinders protrusions, partially covering the support shoe and continuing the side surface of the piston, and holders of the support shoe and, fixed on the console ledges of said piston.

In addition, the ends of the cantilever protrusions of the piston protrude into the annular groove of the guide ring.

FIG. 1 shows a hydraulic machine section in axes of the working cylinders; in fig. 2 - hydraulic machine, cross-section along the axes of the working cylinders with a modified piston group; in FIG. 3, the support shoe of the hydraulic machine shown in FIG. one; in fig. 4 is a view A of FIG. 3; in fig. 5 is a section BB in FIG. 3; in fig. 6 is a cross-section of the support shoe of the hydraulic machine shown in FIG. 2; in fig. 7 - upper part of the hydraulic machine piston; in FIG. 3, section BB, in FIG. 7; in fig. 9 variant of the upper part of the piston, section; in fig. 10 shows versions of the upper part of the piston with holders of the support shoe; in fig. 11 is a hydraulic machine having hydrostatic unloading chambers on the side surface of the piston, section along the axis of the working cylinder; in fig. 12 shows the piston of the hydraulic machine in FIG. eleven; in fig. 13 - the holder of the support shoe of the hydraulic machine in FIG. eleven; in fig. 14 is a variant of the piston group; in fig. 15 shows a piston; in fig. The 16th embodiment of the support shoe for engaging the piston of FIG. 15; in fig. 17 shows an embodiment of a piston group with a piston and a shoe according to FIG. 15 and 16, respectively; in fig. 18 shows an embodiment of a piston with holders of a support shoe.

The radial piston of a hydraulic machine comprises a cylinder block 1 with piston groups including pistons 2 and h-shaped support shoes 3 pivotally mated with them, mounted with the ability of interaction with the supporting surfaces 4 of the guide ring 5, which surrounds the cylinder block 1 and has an annular a groove 6 located between the support surfaces 4 and made symmetrically with respect to the plane of the axes of the cylinders 7, which is the plane of rotation of the cylinder block 1. Each piston 2 is provided with spaced rad In the plane of the axes of the cylinders 7, the cantilever protrusions 8 partially covering the support shoe 3 and extending the lateral surface of the piston 2 and the holders 9 of the support shoe 3 fixed to the console protrusions 8 of the piston 2.

The ends of the cantilever protrusions 8 of the pistons 2 protrude into the annular groove 6 of the guide ring 5.

The pistons 2 in the cylinders 7 form the working chambers 10. The support shoe 3 of the piston group in the interface with the piston 2 has an axis of rotation 11, relative to which a radius 12 performs a bearing surface 13 to mate with a supporting surface of the piston 2, which is also radius 12 The rotation axis 11 of the support shoe has working surfaces 14 for interacting with the support surfaces 4 of the guide ring 5. The support shoes 3 can have notches 15 for contact with the holders 9. However, the support shoe 3 can also be made without notches. In this case, the holder can be made in the form of an elastic plate (Fig. 11, 13, 14 and 17) installed in the grooves 16 of the cantilever projections 8 of the piston 2. The piston 2 on the side surface can be equipped with hydrostatic unloading chambers 17 (Fig. 11, 12 , 14 - 17), which are powered from the working chamber 10 by means of channels 18 and 19 in the piston and divided by a jumper 20 grooves 21, performed on the bearing surface 13 of the support shoe 3 and providing the hydrostatic unloading chambers 17 with periodic working 10 in the head ing on the deflection of the support shoe 3 from its neutral position. Piston 2 can be supplied

and additional hydrostatic unloading chambers 22 not directly connected to the channels 19 in the piston 2. With this design, the additional chambers 22 communicate with the pressure source — the working chamber 10 — through the slots 23, which are made in the wall of the working cylinder 7, as shown in FIG. 11 and 14, which provides a stepwise increase in the area of the hydrostatic discharge chambers, reaching its maximum value at the maximum tangential force acting on the side surface of the piston 2.

The support shoe 3 on its working surface 14 may have hydrostatic discharge chambers 24, which are powered from working chambers 10 through channel 18 of piston 2 and channels 25 in supporting shoes 3.

Radial piston hydraulic machine works as follows.

When the cylinder block 1 rotates, the supporting shoes 3 of the piston groups interact with the supporting surfaces 4 of the guide ring 5, together with the pistons m 2 reciprocating movement in the cylinders 7, which leads to a periodic increase and decrease in the volume of working chambers 10 The pistons 2 are equipped with cantilevers by the protrusions 8, the length of the contact surface of the side surface of the piston 2 with the wall of the cylinder 7 increases, while increasing the contact surface reduces the specific pressure of the piston 2 on the wall of the cylinder 7u or, leaving specific pressure it, significantly increase the torque developed by hydraulic machine, during its operation, for example, in motor mode, or to raise the pressure level developed by the hydraulic machine when it is in the pump mode. At the same time, the self-alignment of the piston group relative to the cylinder block 1 and the guide ring is significantly improved, while the contact of the support shoe 3 with the walls of the cylinder 7 is practically eliminated, which improves the mechanical efficiency of the hydraulic machine.

Thus, using the invention allows to reduce the specific pressure of the piston on the wall of the cylinder and to improve the self-installation of the piston group.

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Claims (2)

. 1.RADIAL-PISTON HYDRAULIC MACHINE, containing a cylinder block ό piston groups including pistons and articulated H-shaped support shoes mounted to interact with the supporting surfaces of the guide ring, covering the cylinder block and having an annular groove located between the supporting surfaces and made symmetrical relative to the plane of the arrangement of the axes of the cylinders, which is the plane of rotation of the cylinder block, characterized in that, in order to reduce the specific detecting the piston on the cylinder wall and improve the self-aligning piston, each piston is provided with radially arranged cylinders axes console ledges to the plane, partly covering the support shoe, and continuing the side surface of the piston and the supporting shoe holders, fixed on the console ledges of said piston. § 2 · Pop. 1, characterized in that the ends of the cantilever protrusions of the piston protrude into the annular groove of the guide ring.