SU1346457A1 - Self-propelled machine with positive-displacement hydraulic transmission - Google Patents

Abstract

The invention relates to volumetric hydraulic transmissions used on self-propelled machines. The aim of the invention is to increase the work efficiency by providing engine starting of a self-propelled vehicle from a tugboat. The volumetric hydraulic transmission contains a suction pipe 8, connected to a pressure line 13 by means of a hydraulic line 12, containing a manually-operated locking device 9 10 and a drain valve 11. The servo cylinder cavity, which ensures that the forward movement of the machine moves forward, is connected to a section of the hydraulic line bypass between the locking device and the drain valve through the additional valve. 1 il. (L 00 4 05 4 recounted

Description

The invention relates to volumetric hydraulic transmissions used on self-propelled machines.

The purpose of the invention is to increase the work efficiency by providing the engine of a self-propelled vehicle with a tow truck.

The drawing shows a hydraulic diagram of a self-propelled machine with volumetric hydraulic transmission.

The volumetric hydraulic transmission contains an adjustable pump 1 with a drive from the engine 2 and a feed pump 3 connected to it, which through a three-position slide valve 4 is connected to servo-cylinders 5 and 6 connected with an inclined pump washer 7. The main line 8 through the locking device 9 with manual control 10 and the drain valve 11 is connected to the bypass hydraulic line 12 with the main line 13, and the cavity of the servo cylinder 5, ensuring the deflection of the washer when the machine is moving forward, is connected to the bypass hydraulic line section between the locking device 9 and the drain valve the valve 11 through the optional 1 nd valve 14, whose response pressure is lower than the response pressure of the drain valve.

Under normal operating conditions, the volumetric hydraulic transmission is locked, its device 9 blocks the flow of working fluid through the bypass line 12, the pump 1 through the line 13 pumps the working fluid into the hydraulic motor 15. The feed pump 3 connected to the main pump provides the necessary pressure in the servo control system

When the motor of a self-propelled vehicle is pulled from a tug, pump 1 operates in motor mode, the hydraulic motor 15, connected via mechanical gear with propulsion 16, in pump mode. The locking device 9 opens the hydroline bypass 12, the spool 4 is set to the position corresponding to the forward movement of the machine. Thus, when the hydraulic transmission is running in the engine starting mode from the tug, the working fluid from the hydraulic motor 15 is pumped through line 8 to the pump 1. Because the servo-control system does not have a make-up pressure and, as a result, the plate 7 is in the zero position, the first time the fluid follows the bypass line through the drain valve 11. A portion of the working fluid acts through an additional one. valve 14, limiting the pressure in the servo control system, to the servo editor P. Gereshi Order 4645/15

C preserver A. Barykov

Tehred I. VeresKorrektor I. Erdeyi

Circulation 589 Subscription

VNIIPI USSR State Committee for Inventions and Discoveries

I3035, Moscow, Zh-35, Raushsk nab. 4/5 Production and printing company, Uzhgorod, ul. Project, 4

cylinder 5, which acts on the washer 7. From the other cavity of the servo-cylinder 6, the working fluid through the hydroline 17 and through the valve 4 goes to the drain.

From the moment the washer is deflected from the zero position, it is possible for the working fluid to pass through pump 1, and hence the rotation of the pump shaft and the motor shaft connected to the pump. After starting the engine, pump 1 starts working

in pump mode. In so doing, the main line 13 becomes pressure and the main line 8 becomes suction. The bypass line is automatically shut down, and the operating position of the inclined washer is ensured by the pressure that the pump 3 feeds. After starting the engine, the locking device 9 is set to a position that blocks the bypass line.

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Claims (1)

Invention Formula Self-propelled machine with volumetric hydraulic transmission, containing a pump kinematically connected to the engine and pump  make-up and connected pressure and discharge hydraulic lines with a hydraulic motor, which is kinematically connected with a propulsion unit, check valves, by means of which the pressure and discharge hydraulic lines are connected to the discharge line Q auxiliary pump, two safety valves, a pump control system that includes a three-position four-line spool that is hydraulically connected to the discharge line of the auxiliary pump, with with a drain and a cavity of the pump control hydraulic cylinder, characterized in that, in order to increase the efficiency of operation by providing the engine from a towboat, the pump control system is equipped with a two-position two-way distributor, a relief valve and an additional valve, and the first two-way two-way distributor is connected to drain line, and the second line through the overflow valve with discharge line and through the additional valve - from one of the cavities of the hydraulic cylinder laziness pump, wherein in the first position toggle distributor Alternate first and second lines are open, and the second - are interconnected. five