SU1252583A1 - Displacement fluid gearing - Google Patents

Description

one

The invention relates to hydraulic gears of rotation using variable pumps equipped with zero-setters and volumetric displacement engines and can be used in vehicles, self-propelled agricultural and road machines, where speed regulation of the speed is required.

The aim of the invention is to improve reliability and durability by briefly using reverse hydraulic transmission.

FIG. 1 shows volumetric hydraulic transmission with a thermal protection system; in fig. 2 - the same with the implementation of the system of thermal protection with a check valve.

The volumetric hydraulic transmission contains an adjustable pump 1, a hydraulic motor 2, a pump 3 feed. Pump 1 is provided with a servo-controlled cylinder A with a zero-setter 5. The working cavities 6 and 7 of the servo-controlled cylinder 4 communicate with the discharge line 8 of the charge-pump 3 and the discharge line 9 through the servo-control valve 10. The hydraulic transmission is equipped with two-position spools 11, the control line 12 of which is connected to the thermo-force element 13. One of the cavities 6 of the cylinder A of the servo-control is connected by line 1A through the servo-valve 10 of the hydraulic control 9 to the drain line 9, in addition, the cavity 6 can be connected to the line 9 of the drain via double-acting spool 1 1. The cavities 6 and 7 can be connected to each other through an additionally installed check valve 15 and a two-position valve 11.

When the hydraulic transmission is operating within the allowable temperature of the working fluid, the two-position valve 11 overlaps the line 14 connecting the valve 10 to the cavity 6 of the servo-steering cylinder 4, which provides the vehicle movement

forward. In the event of overheating of the volumetric hydro-jQ tool, it is possible to transfer the thermal-force element

moving in both directions.

2525832

through the control line 12 (made, for example, in the form of a rod) acts on the spool 11, moving it to the open application. Wherein

5, the cavity 6 of the cylinder 4 communicates with the drain line 9, so that the cavity 6 becomes inactive, the pressure in it drops to the pressure of the drain, and the zero setting 5 moves the regulator of pump 1 to the zero position.

When the vehicle is moving backwards, the working space is the Cavity 4 of the cylinder 4, which controls the pump 1. After the temperature of the hydraulic drive drops to an acceptable level, the thermal force element 13 returns the valve 11 to the closed position, blocking the line 14 connecting it to the cavity 6 cylinder 4. The vehicle is able to move in both directions.

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five

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When a check valve 15 is used in line 14 of the two-position spool 11, when hydraulic transmission is overheated, the spool 11 is moved by the thermo-force element 13 to the open position, communicating together the cavity 6 of the cylinder 4 with the drain through the check valve 14 and the servo-control valve 10 and simultaneously with the cavity 7 of the cylinder 4, so that in both cavities 6 and 7 of cylinder 4, the pressure of the drain and the regulator of the pump 1 is set by the null-adjuster 5 to the zero position, stopping the rotation of the hydraulic transmission in forward motion, i.e. excluding the forward movement of the vehicle.

When reversing, the cavity 7 of the cylinder 4 is isolated from the cavity 6 and the discharge line 9 by the check valve 15. The cavity 7 controls the flow of the pump 1. When the hydraulic transmission temperature decreases, the spool 11 blocks the line 14 connecting it to the cavities 6 and 7 The tool has the ability to

moving in both directions.

G15, W 11, L

f-4 4 --Г / -9

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Editor A. Shandor

Compiled by A. Volkov Tehred O. Gortvay

Order 4609/39 Circulation 880 Subscription

VNISHI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

   "". -

Production and printing company, Uzhgorod, st. Project, 4

FIG. 2

Corrector B, Sinitska

Claims (2)

1. A VOLUME HYDRAULIC TRANSMISSION containing an adjustable naeos, a hydraulic motor, a feed pump, a servo control cylinder with a zero setter, while the working cavities of the servo control cylinder are connected to the discharge line of the feed pump and the drain line through the servo control valve, a two-position valve, the control line of which is connected to the thermos an element characterized in that, in order to increase reliability and durability by short-term use of hydraulic transmission reverse, one of the cavities of the servo-control cylinder with yazana through a two-position slide valve with drain line. 2. The hydraulic transmission according to claim 1, characterized in that the servo-cylinder cavities are interconnected via an additionally installed non-return valve and a two-position spool. SU „1252583 /> 1-1 ______ b Figure 1