SU937795A1 - Hydraulic servo amplifier - Google Patents

Description

(S) HYDRAULIC SERVER BOOSTER

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The invention relates to mechanical engineering, in particular to hydraulic servo amplifiers for tractors, and can be used in other branches of the national economy.

A hydraulic servo-amplifier is known, comprising a housing mounted therein to form a working and rod cavity a piston with a drilled rod and a working medium distributor placed in the rod and connected to the control drive through a lever whose swing axis is connected to the piston C1.

A disadvantage of the known servo amplifier is the complexity of manufacturing and operational reliability of the working medium distributor, made in the form of a spool pair.

The purpose of the invention is to simplify the manufacture of a hydraulic servo amplifier and increase the reliability of its operation.

This goal is achieved by the fact that the working medium distributor is made in the form of a valve, the shut-off element of which is connected to the control actuator, and the seat is installed in the piston on the side of the working cavity with the possibility of axial movement. relative to the piston and provided with a through central channel, communicating the working and rod end.

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The drawing shows a hydraulic servo amplifier in the section.

The servo amplifier consists of a housing 1 which, through a finger 2, rests on the tractor housing with the possibility

Claims (1)

t5 swing. The housing 1 is equipped with a pressure fitting 3 and a drain fitting. In the housing 1 with the formation of the working and rod cavities 5 and 6, a piston 7 is housed in the central channel S of which a locking element 9 is placed, on the upper end of which there is a spherical head 10 connected to a lever 11 fixed by means of a finger 12 on the piston 7 with the possibility of swing. A control actuator 13 is connected with the lever 11. From the side of the working cavity 5 in the piston 7, an It saddle with a through central channel 15 is axially displaced relative to the piston 7. The lever 17 of the mechanism, driven in power servo action. The lever 17 is connected to the return spring 18. The hydraulic servo-amplifier operates as follows. When the working fluid is supplied through the pressure fitting 3, the fluid passes through the channel 15 and, by the mine, the locking element 9, enters the rod cavity 6 and the drain / fitting A. Pressure of the working fluid the piston 7 is insignificant. When the control actuator 13 moves upwards, the lever 11, turning, lowers the locking element 9, preventing the free flow of working fluid from the cavity 5 into the cavity 6. The pressure in the working cavity 5 increases, the piston 7 moves up, and acts on the lever 17 , at that, the return spring 18 is stretched. After the control actuator 13 stops moving, the piston 7 continues to move upwards, turning the lever 11 and opening the Locking element 9. The constipation between the locking element 9 and the seat 14 increases, the pressure in the cavity 5 drops. When the force created by the pressure of the working fluid on the piston 7 and the resistance force of the lever 17 balance each other, the movement of the piston 7 stops. In this case, the relative force with which the piston 7 acts on the lever 17 to the force with which the control actuator 13 acts on the lever 11 is equal to the ratio of the area of the piston 7 to the area of the channel 15. multiplied by the gear ratio of the lever 11. As the control actuator moves 13 downward, the lever 1, turning, raises the locking element 9, the resistance to overflow of the working fluid between cavities 5 and 6 falls, the piston 7 under the influence of the return spring 18 and the lever 17 lowers. The use of this hydraulic servo amplifier design makes it possible to significantly simplify its manufacture and increase reliability due to the lower sensitivity of the valve distributor to the purity of the working fluid. Claims of the invention A hydraulic servo amplifier comprising a housing mounted therein to form a working and rod end cavity with a hollow rod piston and a working medium distributor placed in the rod and connected to the control drive via a lever whose swing axis is connected to the piston, characterized by that, with the purpose of ensuring reliability of operation and simplifying the manufacture of the amplifier, the working medium distributor is made in the form of a valve, the stop element of which is connected to the control actuator, and the seat is installed in the piston with The working cavity is axially displaceable relative to the piston and is provided with a through central channel connecting the working and rod cavities. Sources of information taken into account during the examination 1. USSR Author's Certificate No. ЗВ0870, кл. F 15 B 9/02, 1970.