RU1797104C - Pressure regulator of automotive vehicle pneumatic brake system - Google Patents

Abstract

The invention relates to the field of automation, in particular to pressure regulators of pneumatic drive of brakes of motor vehicles. The purpose of the invention is to increase reliability and simplify the regulator. The goal is achieved due to the fact that the working piston 11 is passed through the next piston 5, the upper part of the working piston is made stepwise. A normally open exhaust valve is made on the inner surface of the larger stage in the form of a round sealing ring 15 pressed by a L-shaped washer 16. A normally closed inlet valve 25 is made on the surface of the lower stage. 25 il.

Description

The invention relates to the field of auto: biotechnology and can be used in the supply of pneumatic and

- -Ammohydraulic brake drive

“In vehicles.

Pressure regulator designs are known, but virtually all pressure regulators discharge the compressor into the atmosphere.

8, as a prototype, a pressure regulator was selected, which, in its functional purpose, device, and operation, most closely matches the developed design.

It contains a housing with inlet and outlet cavities separated by a non-return valve, a spring-loaded follow-up piston, a working piston with a normally closed inlet valve that connects the output cavity to the working piston chamber, an unloading device, which is a rod with a shut-off element for unloading a valve separating the inlet cavity from the atmosphere, a working piston interacting with the rod through the control piston and a normally open spring-loaded exhaust valve rigidly connected to the rod Nogo device in a ferrule connected to an output mode cavity with the atmosphere through the through hole in the rod.

The complexity of the design of such a regulator leads to an increase in the cost of manufacturing the product, to a decrease in reliability.

In order to eliminate these drawbacks, a new design is proposed, the purpose of which is to increase reliability and simplify the design of the controller.

Thus, the invention will simplify the regulator, reduce the dimensions and its metal consumption, as well as increase the reliability, manufacturability, while achieving an economic effect by simplifying the manufacture and reducing the metal consumption.

The essence of the invention lies in the fact that in the pressure regulator containing an unloading, regulating device including a follower piston, a stepped working piston is passed into the made axial channel, a sealing element of a normally open exhaust valve is installed in the upper part, and in the lower part normally closed inlet valve shutoff element. A working piston encompasses a control piston and a rod, which provides increased operational reliability and control.

The implementation of a stepped working piston with a normally-open exhaust valve in the upper part and with a normally-closed shut-off element in the lower part makes it possible to increase reliability, as well as to obtain a reduction in size and simplify the pressure regulator.

The drawing shows a sectional pressure regulator according to the invention.

0 The pressure regulator comprises a housing 1, in which a check valve 2 is placed separating the inlet cavity 3 from the outlet cavity 4.

A spring-loaded follow-up piston 5 is placed in the housing 1, sealed in the housing by a ring 6, its movement is limited by the protrusion of the casing 7, the tracking piston 5 is pressed against the end of the housing 1 by a spring 8 using the adjusting screw 9,

0 acting through plate 10.

The control piston 11 is pressed against the inner baffle of the housing 1 by the spring 12 with the help of an adjusting screw 13 acting on the plate 14.

5 The control piston 11 in the upper part has a normally open exhaust valve made in the form of a round sealing ring 15 installed in the groove of the control piston 11 and pressed with a L-shaped washer 16, in the lower part there is a sealing piston 11 ring 17 and a locking element of a normally-closed intake valve made in the form of an annular

5 of the sealing element 18.

In the control piston 11 there is a working piston 19 with a sealing ring 20 and is able to interact with the lower end of the control piston 11 and with the lock washer 21. The lock washer (shoulder) is installed on the stem 22, which is spring-loaded with spring 23 through the washer 24. The washer 24 covers the sealing locking element 25 (or

5 (normally closed spring-loaded shut-off valve) mounted on the stem 22, the spring 23 presses the shut-off element 25 against the end face of the cover 26. which is sealed in the housing 1 by a ring 27. Stem 22

0 has two o-rings 28. On the casing 7, a labyrinth seal washer 29 is installed, the next piston 5 has an upper end face made in the form of a seat 30 ..

5 The following cavities and channels are available in the pressure regulator: 31 - cavity of the follower and control pistons (sub-piston cavity); 32 - chamber (channel) of the working and control pistons; 33 - channel communicating the output cavity 4 s

cavity 31; 34 - discharge channel; 35 is a channel communicating the cavity under the casing 7 with the atmosphere.

In the next piston 5, a through axial channel is formed.

A channel in the form of two radial holes is made in the control piston 11.

In the initial position, the follower piston 5 and the control piston 11 are in the lower position.

In this case, the annular seal of the locking element 18 is pressed against the inner baffle of the housing 1, separates the cavity of the follower and control pistons 31 with the atmosphere, and the chamber of the working control pistons 32 through the hole in the control piston 11, the cavity under the casing 7 and channel 35 communicates with atmosphere

The rod 33 with the locking element 25 is pressed against the end face of the cover 26 divides the input cavity 3 with the discharge channel 34.

The pressure regulator operates as follows.

Compressed air from the compressor enters the inlet cavity 3 and, opening the valve 2, enters the outlet cavity 4 and simultaneously through the channel 33 into the cavity of the follower and control pistons 31.

With increasing pressure, the follower piston 5 moves, the pistons and rod 22 are stationary in the working 19 and control 11 pistons. At a pressure close to the pressure limit, the normally open exhaust valve is sealed, the ring 15 sits on the seat 30 and the L-shaped washer 18 is in contact with the end face of the follower piston 5, and the working and control piston chamber is disconnected from the atmosphere.

When the pressure of the compressed air reaches the upper limit of operation, the servo piston 5 begins to move together with the control piston 11. The annular seal 18 opens the chamber

working 19 and controlling 11 pistons, compressed air acts on the working piston 19, which moves all the way to the lock washer 21 and further 5 moves together with the rod 22 until the stop of the rod 22 in the inner baffle of the housing 1, and the next piston 5 and the control piston 11 stops moving. In this case, the input

0 cavity 3 with a discharge channel 34. The compressor is unloaded. When the air pressure in the system drops to a value corresponding to the lower limit of operation, the regulator operates in the reverse order. The compressor starts to operate in the pumping mode of the system with compressed air.

When the compressed air pressure in the system reaches the upper limit value

0 when the controller is triggered, the cycle repeats.

In the case when the pressure system reaches the upper limit of operation, and unloading by the regulator is not included (this

5 is only possible when the follower piston 5 is in the lower position), then the control piston 11 moves under the action of increased air pressure, the ring seal 18

0 opens chamber 32 and excess air pressure from the system is vented to the atmosphere through an opening in the control piston and channel 35.

At the same time, the air pressure acts on the working piston 19, which moves from the rod 22, which opens the locking element 25, communicates the inlet cavity 3 with the discharge channel - the compressor is unloaded.

0 When the air pressure in the system drops. up to a value corresponding to the lower limit of operation of the safety mode, the controller operates in the pumped mode of the system with compressed air.

5

Claims (1)

SUMMARY OF THE INVENTION A pneumatic brake actuator pressure regulator for motor vehicles, comprising a housing divided by a check valve into an outlet and an inlet cavity, an adjustment device including a spring-loaded follow-up piston with an axial channel, a spring-up cavity of which is connected to the output cavity, a working piston, a normally closed spring-loaded a shut-off valve associated with a rod; a normally closed inlet and a normally open exhaust valve, characterized in that: about. in order to increase the reliability and simplify the regulator, it contains a control piston, and the rod, working and control pistons are mounted concentrically with a seal in the axial channel of the follower piston, the upper end of which with the protrusion of the control piston forms a normally open outlet adapter, an end face with the housing forms a control piston with a stem and a control piston, an inlet valve radially closed, with an opening in the control piston the input of which is connected to the output polo and the gap between the control piston and , and the output is connected to the inlet by a nor- mal piston, and the working piston of a normally open exhaust valve is tanned with an emphasis on a shoulder made on through the channel formed by the inter-stock gap.