SU802111A1 - Pneumatic valve for connecting trailer control line to tractor receiver - Google Patents

Description

(54) PNEUMATIC VALVE FOR COMMUNICATION OF THE CONTROL RANGE OF THE TRAILER WITH THE RECEIVER TRACTOR

one

The invention relates to pneumatic brake control systems for motor vehicles, which transfer force from the brake control unit to the brake mechanisms, and concerns the design of a valve that communicates the trailer control line to the receiver tractor.

A pneumatic valve is known for communicating the control line of the trailer with the receiver of the traction, comprising a housing consisting of two sections, the first of which contains the pusher-operated shut-off elements for selectively communicating the connection of the control conduit to the receiver and the atmosphere, and In the second section, two external surfaces are installed in series, the first of which is in contact with the pusher, with cavities formed between the pistons and between the second wall and the end wall communicating with fittings for connection to different brake circuits. 1.

Valves of the valve are installed freely in its housing relative to each other and are not connected to each other.

With healthy circuits, one of the valve pods is constantly in a fixed position and, due to the formation of corrosion, can jam it in the housing, which reduces the reliability of the valve as well as the entire system when one of the circuits comes out. Moreover, this negative phenomenon can practically be detected in the event of failure of one of the circuits of the brake actuator.

The aim of the invention is to increase the reliability of the valve.

The goal is achieved by the fact that the pneumatic valve is provided with an additional pusher installed with a seal between the pores, with the ends of the additional pusher placed in the holes made at the ends of the ples.

In the additional pusher is made

axial channel, and in radial x - radial

channels communicated with the axial channel.

The drawing shows a pneumatic

valve integrated into the brake system.

Claims (2)

A pneumatic valve is installed in the articulated truck brake system, which has a two-section brake master cylinder, an Idontour hydraulic brake drive, a pneumatic valve, has a first section 2, which communicates the control line 3 of the trailer with a receiver 4 tons of gauge, and a second section 5, in which pores 6 and 7. The cavity 8 between the pistons and the cavity 9 between the piston 7 and the end wall 10, made in the form of a plug, is in communication with the circuits (pipelines II and 12) of the hydraulic brake actuator the towing vehicle. The system is equipped with an additional pusher 13 installed tightly with seals between the pulses 6 and 7 and entering its ends into the holes 14 and 15, made at the ends 16 and 17 of the pulses 6 and 7. The pusher 13 has an axial channel 18, and the pistons 6 and 7 have The radial channels 19 and 20 communicating with this channel 18, between which the sealing elements 21 and 22 are mounted on the pusher. In addition, the pistons have protrusions 23 and 24, one of which interacts with the pusher 25 of section 2 and the other with the wall 10 section 5. On the protrusions 23 and 24 are installed other sealing elements 26 and 27. Sealing elements 21 and 22 are C-shaped cuffs, sponges 28 and 29 of which face each other and abut respectively on the body of section 5 and pusher 13. Sealing elements 26 and 27 are made in the form of C-shaped cuffs, sponges 30 and 31 of which are turned in different directions, the body of section 5 forms with the body of section 2 a working chamber divided by a membrane 32 into two chambers 33 and 34. The membrane is spring-loaded with a spring 35. Coaxial elements are installed in the body of section 2 coaxially with the pusher 25 as valve heads 36 and 37, interconnected by the rod 38 and spring-loaded with another spring 39. The cavity 40 of the pusher 25 communicates through the openings 41 with the chamber 33, and through the seat 42 for the head 36 to the cavity 43, which is formed by the pneumatic valve body. The cavity 43 is communicated through the opening 44 with the camera 34. The system also has brake chambers 45 and 46, a receiver 47 and connecting heads 48 and 49 of the trailer train. Head 48 connects supply line 50 to trailer receiver 47. Compressor 51 t gacha communicated via line 52 with cavity 53 in choke 54, screwed into the body of the section 2. Between the cavities 43 and 53, the seat 55 of the valve head 37 is located. The circuits (pipelines 11 and 12) of the brake actuator are connected by pipes 56 and 57 with hydraulic wheel cylinders 58 and 59 tons of gacha. The master brake cylinder 1 is driven by a brake pedal 60. When the pedal 60 is depressed, brake fluid from brake cylinder 1 is directed through pipelines 56 and 57 to brake wheel cylinders 58 and 59 and is supplied through pipelines 11 and 12 in cavities 8 and 9 of the section 5 valves. The brake fluid supplied to the cavity 9 acts on the total area of the protrusion 24, including the area of the sealing element 27. The brake fluid supplied to the cavity 8 transfers pressure to the piston 7 through the area of the sealing element 22. Therefore, the piston 7 moves under the action of a greater force transmitted from the side of the cavity 9. This force moves the piston 7 and the pusher 13 to the left, acting on the piston 6. Then, through the piston 6, on which the liquid acts, in addition, through the sealing element 21, the force is transmitted to the follower 25 2 projection of the valve. Thus, a force proportional to the brake fluid pressure in the brake system acting on the area of the piston 7 is transmitted to the pusher 25. In this case, both brakes 6 and 7 are moved in the section 5 case when braking occurs. t gacha) both pistons move under the pressure of brake fluid entering the cavity 9. If pipeline 12 is damaged (damage to the second drive circuit t gacha), only piston 6 moves. As a result, with serviceable circuits or damage one of the circuits, provides reliable movement of the pusher 25, due to the movement of which the saddle 42 is closed by the locking element-head 36, and the saddle 55 is opened by the locking element-head 37, while passing compressed air from the receiver 4 through the cavity 53, the hole 44 and the chamber 34 to control line 3, through which the trailer brake system is controlled. Thus, due to the design of this valve and the increase in its reliability, the reliability of the braking system when one of the hydraulic brake actuator circuits leaves the system significantly increases safety. Practically, the increase in reliability by means of this valve eliminates the effect of a malfunction in the dual-circuit brake system on the reliability and safety of the train. Claim 1. Pneumatic valve for communicating the control line of a trailer with a receiver, comprising a body consisting of two sections, the first of which contains pusher-controlled shut-off elements for selectively connecting the control line brush with a connection to the receiver and with atmosphere, and in the second section two pistons are installed in series, the first of which is in contact with the pusher, with cavities formed between the pistons and between the second piston and the end wall, s with connections for connecting to different contours of the towing vehicle brake, characterized in that, in order to increase the reliability of the valve, it is provided with an additional pusher mounted with seals between the pistons, with the ends Additional pusher is placed in the holes made in the ends of the pistons. 2. A valve according to Claim 1, characterized in that an axial channel is provided in the additional thrust rotor and radial channels in the piston x are connected to the axial channel. Sources of information taken into account in the examination 1. US Patent No. 3275381, cl. 303-7, pub. 1966 (prototype).