RU1779784C - Gear-type hydraulic engine - Google Patents

Abstract

SUMMARY OF THE INVENTION: Gears with trunnions mounted in plain bearings are placed in the bores of a housing with an end cover. Cylindrical bores are made in the lid, one end of which is connected to the high-pressure cavity by connecting channels and the other to the working surface of the plain bearings. In each cylindrical bore a spring-loaded piston is placed on the side connected to the bearings. The axial length of the piston is less than the axial length of the bore; longitudinal grooves are made on its cylindrical surface. 5 ill.

Description

The invention relates to hydraulic engineering.

Gear motors of external gearing are known, comprising a housing with an end cap, the entire interior of which is equipped with gears with pins mounted in sliding bearings, high and low pressure cavities.

The disadvantage of this hydraulic motor is that at the moment of starting the surface of the pin, the gears are pressed against the surfaces of the sliding bearings with great effort, which reduces the friction moment and increases the wear of the sliding bearings, thereby reducing the reliability and durability of the hydraulic motor.

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

This goal is achieved by the fact that in the lid and body are made cylindrical bores, one end of which is connected by connecting channels to the high-pressure cavity, and the other to the working

the surface of the sliding bearings, and in each cylindrical bore there is a piston spring-loaded on the side connected to the bearings, the axial length of which is less than the axial length of the cylindrical bore, and longitudinal grooves are made on its cylindrical surface.

As a result of this embodiment, at the time of start-up, the working fluid under high pressure enters the working surfaces of the plain bearings, which is significantly larger. This reduces the pressing of the trunnion surfaces to the surfaces of the plain bearings.

Thus, the start of the hydraulic motor occurs when the surfaces of the pinions of the gears are slightly pressed against the surfaces of the sliding bearings, which increases the friction moment and reduces the wear of the bearings, as a result of which the failure-free operation and the service life are increased.

In FIG. 1 shows a hydraulic motor, a longitudinal section; in FIG. 2 - section aa into

(L

WITH

 vj y

Xi 00

Ј

FIG. 1; in FIG. 3 is a section BB in FIG. 2; in FIG. 4 is a section bb in FIG. 2; in FIG. 5 is an embodiment of a reverse embodiment of a hydraulic motor.

The external gear hydraulic motor comprises a housing 1 with an end cover 2, in the inner cavity 3 of which gears 4 are mounted with the pins 5 mounted in the sliding bearings 6 of the cavity of high pressure 7 and low pressure 8. In the housing 1 and the cover 2, cylindrical bores 9 are made, one end of which is connected by connecting channels 10 to the high-pressure cavity 7, and the other to the working surface 11 of the sliding bearings 6. moreover, in each cylindrical bore 9 there is a spring loaded 12 from the side connected to a sliding bearing 6, a piston 13, the axial length of which is less than the axial length of the cylindrical bore 9. and longitudinal grooves 14 are made on its cylindrical surface.

An external gear hydraulic motor operates as follows.

Simultaneously with the beginning of the rotation of the gears 4 when the working fluid is fed under high pressure into the high-pressure cavity 7. the pistons 13 located in the cylindrical bores 9 move, and the working fluid is expelled along with the working fluid penetrating the longitudinal grooves 14 of the pistons 13 to work surfaces

/

11 sliding bearings 6, which significantly reduces the pressure of the surfaces of the pin 5 of the gears 4 to the surfaces of the sliding bearings, this happens until the piston 13 abuts against the end face of the bore 9, after which the flow of high-pressure fluid to the sliding bearings 6 stops, and the longitudinal grooves 14 in addition to increasing the amount of working fluid supplied to the sliding bearings 6, also provides the pistons return under the action of the springs 12 after the hydraulic motor stops in its original position. 5 formulas and samples

A gear motor of external engagement, comprising a housing with an end cover, in the bores of which gears with trunnions are installed, mounted in 0 plain bearings, high and low pressure cavities, characterized in that, in order to increase reliability and durability, cylindrical bores are made in the cover and housing , one end 5 of which is connected by connecting channels to the high-pressure cavity, and the other to the working surface of the sliding bearings, with springs placed in each cylindrical bore 30 on the side connected to the bearings, a piston whose axial length is less than the axial length of the cylindrical bore, and longitudinal grooves are made on its cylindrical surface.

3

5-5

II