JP2589041Y2 - Air valves used in pneumatic circuits of automobiles - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air valve used for a pneumatic circuit of an automobile, for example, a brake valve used for an air brake, a quick release valve, a relay valve, and tractor protection.・ Related to valves and relay emergency valves.

[0002]

2. Description of the Related Art In a pneumatic circuit of an automobile, for example, in a brake system of an articulated vehicle, a tractor protection valve is arranged in an air line connecting the brake system of the tractor and the brake system of the trailer, and Even if air pressure failure occurs in the brake system, the tractor has secured the braking function. In the tractor protection valve, the exhaust port is made of metal and is opened and closed by a rubber check valve. There was a risk of sticking to the port.

[0003]

It is an object of the present invention to provide an air valve for use in a pneumatic circuit of a motor vehicle which prevents the valve from sticking to the exhaust port due to freezing.

[0004]

Means corresponding to the problem and its operation
Exhaust port made of port liner molded from resin
And fits into the valve body, and mitigates freezing, reliably preventing the valve from sticking to its exhaust port, and ensuring an exhaust function.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of an air valve used in a pneumatic circuit of a vehicle according to the present invention will be described below with reference to the drawings. FIG. 1 shows a specific example 10 of an air valve used in a pneumatic circuit of a vehicle according to the present invention, which is embodied in a tractor protection valve of a brake system of an articulated vehicle. The tractor protection valve 10 internally defines a plunger bore 12 that is open at one end, and at a predetermined location, a tractor service brake port 13, a tractor service brake port 13, that communicates with the plunger bore 12.
Valve with emergency brake port 14, trailer service brake port 15, and trailer emergency brake port 16
A body 11, a plunger 17 fitted to the plunger bore 12 so that communication between the tractor service brake port 13 and the trailer service brake 15 can be cut off, a valve spring 18,
A port liner 19 fitted into the open end of the plunger bore 12 to form an exhaust port 20, and a rubber check valve 21 disposed in the exhaust port 20
It has just been combined and realized.

Then, the tractor protection
The valve 10 has its tractor service brake port 13 connected to a tractor service brake by piping, its tractor emergency brake port 14 connected to a tractor emergency brake by piping, and its trailer service brake port. 15 is piping to the trailer service brake and the trailer service brake
An emergency brake port 16 is connected by piping to the trailer emergency brake and is located on the air line between the tractor and the trailer.

The plunger 17 has a sleeve at one end.
An end 22 is provided and the sleeve end 22 is slidably fitted under seal to the port liner 19.

The valve spring 18 is seated on the sleeve end 22 with one end seated on the valve retainer 25 of the port liner 19 and the plunger 17 is mounted on the tractor service brake and trailer.・ The service brake communication can be cut off.

The exhaust port 20 formed by the port liner 19 has a valve seat 23.
Is coated with a resin 24 to reduce freezing. Of course, the exhaust port 20 may be made of a port liner molded from resin.

The rubber check valve 21 is screwed to a valve retainer 25 of the port liner 19 and normally has a valve seat 2 of the exhaust port 20.
3 seated.

Next, the operation of the tractor protection valve 10 manufactured in the above-described structure will be described. Now, when the pressure of the air tank of the tractor falls below a specified value due to abnormal pressure reduction in the trailer emergency brake, the communication of the emergency line is automatically cut off, and accordingly, the plunger 17 is moved to the valve position. Moved into its plunger bore 12 by a spring 18 to cut off the service line communication and prevent the tractor air tank pressure from further dropping, as shown in FIG. Then, the brake function of the tractor is secured. Also, as such, when the plunger 17 is moved by the valve spring 18, a portion of the service line compressed air is released to the atmosphere by opening the rubber check valve 21. In particular, this tractor protection
In the valve 10, even in an extremely low temperature or a cold region, the rubber check valve 21 has its freezing mitigated by the resin 24 coated on the valve seat 23 of the exhaust port 20, so that the valve seat can be prevented. The exhaust function can be ensured by avoiding sticking to 23.

As will be apparent from the specific embodiments of the invention described above with reference to the drawings, those skilled in the art will be familiar with the subject matter of this invention. Is the nature of the invention (na
), and are readily embodied in other aspects that are objectively perceived as inherent in them. Of course, the content of this invention is indispensable for the establishment of the invention according to the task of the invention.

[0013]

Advantages of the Invention As will be understood from the above, the air valve used in the pneumatic circuit of the vehicle of the invention is made of a port liner whose exhaust port is molded from resin.
Because fitted to the valve body, in the air valve to be used in the pneumatic circuit of a motor vehicle of the invention, an exhaust function in the valve valve may stick to the exhaust port by freezing is reliably prevented is ensured, in particular ,rubber·
The valve is enabled and its exhaust port is
It is simple and easy to assemble into the lube body, so that it is very useful and practical for automotive pneumatic circuits.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a specific example of an air valve used in a pneumatic circuit of an automobile of the present invention, which is embodied in a tractor protection valve of a brake system of a connected vehicle.

[Explanation of symbols]

 19 Port liner 20 Exhaust port 23 Valve seat 24 Resin

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-238273 (JP, A) JP-A-1-234667 (JP, A) JP-A-62-252276 (JP, A) JP-A-50- 45334 (JP, A) JP-A-49-122031 (JP, A) Japanese Utility Model Application Laid-Open No. 63-118926 (JP, U) Japanese Utility Model Application No. 63-51976 (JP, U) Japanese Utility Model Application No. 63-60781 (JP, U) 59-70967 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) B60T 15/36

Claims (1)

(57) [Scope of request for utility model registration] 1. An exhaust port, comprising: a port molded from a resin;
An air valve used in a car's pneumatic circuit when it is made of liner and fitted into the valve body .