RU1770604C - Gear-type hydraulic machine - Google Patents

Abstract

SUMMARY OF THE INVENTION: the gears are located in the bores of the housing, the pins to-ryh are mounted in the plain bearings. Elastic cuffs are mounted in recesses on the end surfaces of bearings and end compensators and are parts of cylindrical surfaces. Collars are made on the end surfaces of the bearings and compensators on the side of the cuffs, which are parts of cylindrical surfaces symmetrical with respect to the plane passing through the geometrical axis of rotation of the gears and mating with the outer cylindrical surface of the cuffs. 4 ill.

Description

Gear pumps are increasingly used in various fields of national economy for pumping oil, gasoline, diesel fuel, various oils, as well as other fluids with good lubricity.

Gear motors are widely used in hydraulic drives to convert hydraulic energy into mechanical energy.

Hydraulic gear machines with hydraulic compensation of end clearances are known, which allows to significantly increase the volumetric efficiency and also to keep the value of efficiency constant for a long time of operation. Hydraulic compensation is provided by compressing the ends of the compensators to the ends of the gears by means of a fluid supplied from the injection cavity into the annular groove. An example of this is gear pumps used in tractor hydraulic systems (e.g. NSh-10, NSh-32).

However, the aforementioned method for hydraulically compensating end clearances is imperfect since

leads to uneven preload around the circumference, distortions, wear and torsvsv leaks. The aforementioned drawbacks are devoid of the design of a hydraulic machine with hydraulic compensation of end clearances, where high-pressure fluid acts on a surface of a certain configuration (obtained by calculation) to ensure uniform compression of compensators along the ends of the gears.

Of the known hydraulic machines, the closest to the proposed technical essence is a hydraulic machine containing external gears placed in the bores of the housing, the trunnions of which are mounted in sliding bearings, end compensators and elastic cuffs installed in recesses on the end surfaces of sliding bearings and compensators, parts of cylindrical surfaces that are mechanical end compensators are pressed against the ends of the gears by the pressure of the working fluid, which falls into the gap between the elastic cuff and end compensator.

The disadvantage of the described gear hydraulic machine is the low reliability

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and durability due to squeezing of the cuff by the working fluid into the gap between the sliding bearing and the compensator.

The purpose of the invention is to increase the reliability and durability of the hydraulic machine

This goal is achieved by the fact that in the above-described gear hydraulic machine in sliding bearings and compensators on the end surfaces from the recesses, collars are made, which are cylindrical surfaces symmetrical with respect to the plane passing through the geometric axis of rotation of the gears. The collars are adjacent to the outer cylindrical surface of the elastic cups and do not allow the cups to extrude into the gap between the end compensators and the plain bearings.

Thus, the proposed hydraulic machine has the following distinctive (from the prototype) features:

1. Insertion of collars on the end surfaces of the slide bearings and expansion joints to reinforce the elastic sleeve.

2. The implementation of the collars in the form of a part of a cylindrical surface mating with the outer surface of the cuff.

The presence of these distinguishing features determines the compliance of the proposed solution with the novelty criterion.

When analyzing these distinctive features for compliance with the criterion, significant differences were found that features 1 and 2 were not found in any of the analogues of the proposed solution.

Thus, the set of distinctive features of the proposed solution meets the criterion of significant differences.

To explain the construction of the gear hydraulic machine and how it works, FIG. 1-4, where a reinforced element of a general view and places for an elastic sleeve on end faces of compensators and plain bearings are shown.

The gear hydraulic machine comprises a housing 1, sliding bearings 2, on which the pinions 3 of the gears 4 are supported. The compensators 5 are provided with grooves, as well as sliding bearings, for installing elastic sleeves b, which abut against their cylindrical grooves B and collars And made in plain bearings and expansion joints. When the hydraulic machine is operating, high-pressure fluid enters

between the compensator and the cuff, which ensures reliable compression of the ends of the compensators to the ends of the gears. The collars prevent the extrusion of elastic cuffs, which increases the reliability and durability of the cuff and the entire machine.

The company has developed an experimental design for an existing hydraulic machine, which has currently gone through a full cycle of mining.

Claims (1)

SUMMARY OF THE INVENTION An external gear gear hydraulic machine comprising gears housed in housing bores, trunnions mounted in plain bearings, end compensators, elastic collars mounted in recesses on end surfaces sliding bearings and compensators, which are parts of cylindrical surfaces, characterized in that, in order to increase reliability and durability, collars are made on the end surfaces of sliding bearings and compensators from the side of elastic cuffs, which are parts of cylindrical surfaces symmetrical about the plane passing through geometrical axes of rotation of the gears and associated with the outer cylindrical surface of the elastic cuffs. J 7 Editor O. Stenina Compiled by G. Makarov Tehred M. Morgenthal 1770604 Fie4 Proofreader T. Paly