RU1770593C - Gear-type hydraulic machine - Google Patents

Abstract

Usage: in hydraulic systems for various purposes. SUMMARY OF THE INVENTION: During operation of a gear hydraulic machine, the working fluid is transferred from the inlet cavity to the outlet cavity. At the same time, high-pressure fluid seeps through structural and technological gaps between the parts of the hydraulic machine. Fluid leaks are discharged into cavities connected to the low pressure zone. If the non-reversible hydraulic machine is assembled to operate in the opposite direction of rotation of the drive shaft, fluid leaks are discharged through a groove located on the low pressure side. Similarly, leaks are diverted in a reversible hydraulic machine when the high and low pressure zones are interchanged. The location of the grooves is determined by the ratio Dp / 4, Ј L Dp / 2, ensuring their optimal location for efficient drainage. 2 ill.

Description

The invention relates to mechanical engineering, in particular to hydraulic machines, and is intended for use in hydraulic systems for various purposes.

A well-known gear hydraulic machine is provided, comprising a housing with a bottom, in the bores of which are the driving and driven gears, which are supported by sliding bearings, an end cover and an end gap compensation device.

Closest to the technical nature of the present invention is the design of a gear hydraulic external gearing machine comprising a housing with a bottom and an end cap, in the cylindrical bores of which are located the driving and driven gears with axles mounted in bearings

sliding, and in the end cover and the bottom of the housing, bores are made for the centering flanges of the bearings, and in the bottom body, parallel to the plane passing through the axis of the bores, a groove is made connecting these bores.

The disadvantage of this design is the inability to implement reversibility, i.e. providing the possibility of changing the direction of the drive shaft without additional bulkhead, as well as the inability to assemble irreversible hydraulic machines of both the right and left directions of rotation of the drive shaft with the same unified housings and covers.

The aim of the invention is to ensure the reversibility of the hydraulic machine and to enable assembly neereerSP

WITH

vj vl

ABOUT O 00

hydrostatic machines of both the right and left directions of rotation of the drive shaft with the same unified housings and covers.

In order to achieve the set goal in a gear hydraulic machine of external gearing, comprising a housing with a bottom and an end cover, in the cylindrical bores of which there are drive and driven gears with axles installed in sliding bearings, and end-gap compensators mating with the gears, moreover, in the end-face , the lid and the bottom are made bores for the centering flanges of the bearings, and in the body of the bottom, parallel to the plane passing through the axis of the bores, a groove is made connecting the bores to allow To drain liquid leaks on one or the other side on the inner surface of the end cover, parallel and symmetrical to the plane passing through the axis of the bores, two grooves connecting the bores, and on the inner surface of the bottom, made detachable or solid, made in parallel the plane passing through the axis of the bore, an additional groove, and the location of the grooves is determined by the ratio

° and L SB

4 L 2

where L is the distance from the plane passing through the axis of the bore to the outside of the grooves;

Dp is the diameter of the bore.

The invention is illustrated by the drawings, in which: 1 - gear hydraulic machine, longitudinal section; figure 2 is the same. section AA in figure 1.

The gear hydraulic machine consists of a housing 1 with a bottom 2 (the bottom shows a detachable bottom, but it can be made integral with the housing), an end cap 3 and a swing unit, which includes a drive gear 4 and a driven gear 5, plain bearings b, serving gear bearings. end gap compensators 7 and elastic figured cuffs 8. In end cap 3 and bottom 2, bores 9 are made for centering shoulders 10 of sliding bearings 6. Two grooves 11 and 12 are made on the inner surfaces of end cap 3 and bottom 2. connecting bores 9 moreover, they are located parallel and symmetrical to the plane passing through the axis of the bore 9.

Gear hydraulic machine operates as follows.

During operation of the gear hydraulic machine when the gears 4 and 5 rotate

working fluid in tooth cavities is transferred from the inlet cavity to the outlet cavity. At the same time, high-pressure fluid seeps through structural and technological gaps between the parts

hydraulic machines, through the channels in the parts, through the pinions of the gears and into the bores 9 of the bottom 2 and the end cover 3, which include the centering collars 10 of the sliding bearings 6. On one of the grooves 11 or

12 on the end cap 3 and on the bottom 2 located on the low pressure side, hydraulic fluid leaks are discharged into cavities connected to the low pressure zone. If a non-reversible hydraulic machine is assembled

in order to operate in the opposite direction of the drive shaft, then (without changing the position of the end cover and the bottom of the housing), hydraulic fluid leaks are discharged through another groove, which in this case is on the low pressure side. Likewise, leaks are discharged in a reversible hydraulic machine when the direction of rotation of the drive shaft changes and the high and low pressure zones are interchanged, and grooves are used alternately on one or the other side.

The location of the grooves, defined by the ratio:

D

Dr

NOT | Ґ $.

4 L 2

ensures their optimum location for efficient leakage and the operability of the hydraulic machine.

Claims (1)

The claims An external gear hydraulic machine comprising a housing with a bottom and an end cover, in the cylindrical bores of which there is a drive and driven gears with trunnions mounted in sliding bearings and gearboxes of end-face clearances mating with gears, with bores for centering bearing flanges made in the end cap and bottom, and a groove made in the body of the bottom parallel to the plane passing through the axis of the bores boring, characterized in that, in order to simplify the design, ensuring the reversibility of the hydraulic machine and the ability to assemble non-reversible hydraulic machines of both the right and left directions of rotation of the drive shaft with the same unified covers and cases, in the end cap on the inner surface are parallel and symmetrical to the plane passing through the axis of the bores, two grooves connecting the bores, and on the inner surface of the bottom, made detachable or solid, made parallel and symmetrical to the plane passing through the axis of the bores , additional groove, and the location of the grooves is made according to the ratios Dp / 4 LЈ Dp / 2 where L is the distance from the plane, the passage through the axes G to the outer side of the grooves; Dp is the diameter of the bore.