JP3443680B2 - Tractor braking device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tractor braking device that protects the air tank pressure on the tractor side when an air leak occurs between the tractor and the trailer and simplifies the operation therefor.

[0002]

2. Description of the Related Art Conventionally, a parking brake lever controls a mechanical parking brake (a center brake mounted on a propulsion shaft) and a control valve controls a spring brake for braking a wheel, and an emergency brake control valve operates the spring brake of a tractor. Brake devices for tractors and trailers that control the air system and the emergency brake operation control of the trailer in cooperation with each other have the following configurations.

That is, as shown in FIG. 3, the brake device on the tractor side includes a service brake signal line 14 connected from a brake valve 3 connected to a service brake air tank 1 to a trailer relay valve 4, and a spring (not shown). Service brake line 13 connected to the brake chamber 7 and air tank for trailer brake
An emergency brake line E that constantly supplies air to a trailer-side air tank 23, which will be described later, via a service brake line S that supplies signal air for service brake from 2 to the trailer side through the trailer relay valve 4 and a cock 11. It consists of and.

As shown in FIG. 4, the brake device on the trailer side is provided with a spring brake chamber 20 and an air tank 23, and the service brake line S and the emergency brake line E on the tractor side are connected via a coupling 15. Relay emergency valve 21 for supplying air to the spring brake chamber 20 via the pipe 22 to operate the service brake and also supplying air to the air tank 23 via the pipe 24. And is connected to the spring brake chamber 20 through the air tank 23, the parking control valve 25, and the pressure control valve 26, and air is normally supplied to compress the spring to deactivate the spring brake. Product A structure for exhausting the air in the spring brake chamber 20 which compresses the spring and actuating the parking control valve 25 when to.

[0005]

When air leakage occurs in the coupling 15 and piping in the emergency brake line between the tractor and the trailer, it is necessary to protect the pressure in the air tank 2 for the trailer brake. Therefore, in the conventional tractor braking device, the emergency brake line E is shut off by closing the cock 11 provided in the emergency brake line E.

Since this cock 11 is provided in the pipe outside the cab, it has been necessary to perform a troublesome operation to get out of the cab.

An object of the present invention is to provide a tractor braking device which protects the air tank pressure on the tractor side when an air leak occurs between the tractor and the trailer, and which can be operated in the cab.

[0008]

According to a first aspect of the present invention for achieving the above object, a service brake air tank and a trailer brake air tank are provided, and the service brake is operated by operating a brake valve. Supply the air from the air tank to the spring brake chamber to activate the service brake, and use the trailer relay valve to supply the air from the trailer brake air tank to the trailer side with the service brake line and the air from the trailer brake air tank. the a brake system of the tractor with a emergency brake line for supplying the air tank always trailer side, the pipe to the pipe path of supplying emergency brake line air air tank for the trailer braking on the trailer side And air pressure drops below a specified value
The piping passage and close the emergency brake line.
Manually or automatically operated cab controller communicating with the atmosphere
The le valve is provided in the cab of the tractor.

As described in claim 2, the service brake air tank and the trailer brake air tank are provided,
By operating the brake valve, the air from the service brake air tank is supplied to the spring brake chamber to operate the service brake, and the trailer relay valve supplies the air from the air tank for the trailer brake to the trailer side. In a braking device for a tractor, which comprises an emergency brake line that constantly supplies air from the trailer brake air tank to the trailer side air tank, the trailer brake air tank and the tractor side
The spring connected to the spring brake chamber
Brake chamber air is exhausted to spring brake
And activate the emergency brake line.
Spring brake control valve to disconnect, and
Spring brake control valve and emergency
The above-mentioned spring brake is connected to the si brake line
Emergency control when the control valve is not activated
The cab control valve that shuts off the
Installed in the cab of the tractor, the emergency brake
Air is supplied to the trailer from the line and spring brake is applied.
Control valve and that of cab control valve
The emergency brake lights are linked to the respective exhaust operations.
The emergency brake line.
It is equipped with a cut valve for discharging a .

According to a third aspect of the present invention, in each of the above configurations, a trailer pickup switch for detecting air pressure is provided in the emergency brake line.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. [Embodiment 1] (Corresponding to claim 1) As shown in FIG. 1, a tractor braking device has a service brake signal line 14 extending from a brake valve 3 connected to a service brake air tank 1 to a trailer relay valve 4. When a service brake line 13 connected to an unillustrated spring brake chamber, Torre
-Emergency brake air piping 40 connecting the air tank 2 for the trailer brake and the trailer relay valve 4
And a service brake line S for supplying signal air for service brake from the trailer relay valve 4 to the trailer side, and an upstream of the trailer relay valve 4 of the emergency brake air pipe 40 to constantly supply air to the trailer side. It is composed of an emergency brake line E supplied to an air tank and a cab control valve 36 provided in the emergency brake air pipe 40. The trailer brake device has the configuration shown in FIG.

The trailer relay valve 4 has service brake signal pressure input ports a and b to which the service brake signal line 14 is connected, an air input port c from an emergency brake, and a service brake line port e. , And an air discharge port d.

The cab control valve 36 opens the passage against the spring by the pressure when the air pressure in the emergency brake air pipe 40 is equal to or higher than a certain pressure. When the pressure in the air pipe 40 drops below a specified value, the passage is closed by a spring, and the emergency brake line E
Is communicated with the atmosphere and can be operated automatically or manually.

In the trailer relay valve 4, air is constantly supplied to the air input port c during normal non-braking, and the air supplied to the air input port c has a signal pressure from the service brake signal line 14 as a service brake signal. When the pressure is applied to the pressure input ports a and b, a signal pressure is sent from the service brake line port e through the service brake line S to the relay emergency valve 21 of the trailer, and the service brake is applied from the air tank 23 of the trailer to the spring brake chamber 20. Air is supplied to operate the service brake, and the air in the trailer brake air tank 2 is constantly supplied from the emergency brake air pipe 40 to the air tank 23 of the trailer through the emergency brake line E.

The operation of the cab control valve 36 shuts off the air in the emergency brake air pipe 40.

Therefore, when an air leak occurs in the coupling 15 and the piping in the emergency brake line E between the tractor and the trailer, the pressure in the emergency brake air piping 40 drops below a specified value. The cab control valve 36 is automatically or manually operated to shut off the air in the emergency brake air pipe 40 to protect the pressure in the trailer brake air tank 2.

[Second Embodiment] (Corresponding to Claim 2) The tractor braking device according to the second embodiment has the same basic structure as that of the first embodiment, as shown in FIG. That is, a service brake line 13 connected from the brake valve 3 connected to the service brake air tank 1 to the trailer relay valve 4 and a service brake line 13 connected to the spring brake chamber 7.
The configuration consisting of is the same as that of the first embodiment.

The second embodiment is provided with a spring brake control valve 18 actuated by a lever 17, a cab control valve 36, and a cut valve 37 in addition to the above-mentioned structure.

The cut valve 37 is a trailer blade.
An air port connected to the air tank 2 for g by the first pipe 32
h, cab control valve 36 and second pipe 35
Connected air input port g, exhaust port i, and
Emage supplying air to Jensi Brake Line E
Signal brake line port j
A) Input port g When the air pressure drops below a certain level,
2 Break the passage of the piping 35 and
The air of the engine E is exhausted to the atmosphere. That is, d
When the defect of the Margency brake line E
Protects the air pressure in the rake air tank 2.

The trailer brake air tank 2 and the air input port c of the trailer relay valve 4 are connected to the first pipe 32.
And the air port h of the cut valve 37, and the trailer brake air tank 2 and the signal pressure air input port g of the cut valve 37 are connected by the second pipe 35.

The spring brake control valve 18 and the cab control valve 36 are connected in series to the second pipe 35, and the spring brake control valve 18 is also connected to the spring brake chamber 7 by a pipe 31. The cab control valve 36 in the second embodiment is the same as the cab control valve 36 in the first embodiment.

In the second embodiment, the spring brake control valve 18 is operated to exhaust the air in the spring brake chamber 7 to operate the spring brake on the tractor side and shut off the air in the second pipe 35.

The air in the second pipe 35 is shut off by operating the cab control valve 36 while the spring brake control valve 18 is not operating.

Therefore, in the second embodiment, the spring breaker is used.
The function of the control valve 18 is to protect the emergency brake line E between the tractor and the trailer when air leakage occurs in the coupling 15 and piping .
By operating the pulling brake control valve 18,
Exhaust air from the spring brake chamber 7 on the tractor side
Out and activate the spring brake on the tractor side
In both cases, the passage of the second pipe 35 is shut off,
The pressure of the air tank 2 for g is protected . Also,
The role of the cab control valve 36 is
Coupling 15 and piping in sybrake line E
Etc., air leakage occurs and emergency brake air distribution
When the pressure in the pipe 40 drops below the specified value, the cab control
The trawl valve 36 operates automatically or manually to operate the second pipe 3
5 to shut off the air to the trailer brake air tank 2
Protect pressure. Also, to shut off the air to the second pipe 35.
Air from the emergency brake line E is exhausted from the cut valve 37 to the atmosphere and the spring on the trailer side is blocked.
Exhaust air from the rake chamber 20 and spray it to the tractor side.
It activates the ring brake.

[Third Embodiment] (Corresponding to Claim 3) In the third embodiment, the trailer pickup switch 12 for detecting the air pressure is provided in the emergency brake line in the first and second embodiments. That is, in the first embodiment, the trailer pickup switch 12 is provided in the emergency brake air pipe 40 upstream of the trailer relay valve 4, and in the second embodiment, the trailer pickup switch is provided in the second pipe 35 upstream of the cut valve 37. 12 is provided.

This trailer pickup switch 12
Determines the connection of the tractor motorcycle and trailer and changes the control of the stop lamp, blinker, retarder, and the like. By providing this in the above specific site,
Coupling 1 of service brake line S on tractor side and trailer side and emergency brake line E
Even when the self-sealing type 5 is used, the trailer pickup switch 12 can detect the air pressure.

[0027]

As described above, according to the present invention, when air leakage occurs in the coupling, piping, etc. in the emergency brake line between the tractor and the trailer, it is arranged in the cab according to the constitution of claim 1. By operating the cab control valve, the emergency brake line is shut off by operating either the spring brake control valve or the cab control valve arranged in the cab according to the configuration of claim 2, and the trailer brake can be operated while in the cab. The pressure of the air tank can be protected.

Further, according to the third aspect of the invention, even if the couplings of the service brake line and the emergency brake line on the tractor side and the trailer side are self-sealing type, the trailer pickup switch can detect the air pressure. Have the advantage of

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram showing a first embodiment of a tractor braking device of the present invention.

FIG. 2 is a circuit configuration diagram showing a second embodiment of the tractor braking device of the present invention.

FIG. 3 is a circuit configuration diagram showing a brake device for a conventional tractor.

FIG. 4 is a circuit configuration diagram showing a brake device of a trailer.

[Explanation of symbols]

1 Service brake air tank 2 Air tank for trailer brake 3 brake valves 4 Trailer relay valve 7 Spring brake chamber (of tractor) 12 Trailer pickup switch 17 lever 18 Spring brake control valve 20 Spring brake chamber (of trailer) 35 Second piping 36 cab control valve 37 cut valve 40 Emergency brake air piping

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B60T 17/18 B60T 11/10

Claims (3)

(57) [Claims] 1. A service brake air tank and a trailer brake air tank, wherein the brake valve is operated to supply air from the service brake air tank to a spring brake chamber to operate the service brake, and the trailer relay valve is used for the trailer brake air tank. In the brake device of the tractor, a service brake line for supplying service brake air to the trailer side and an emergency brake line for constantly supplying air from the trailer brake air tank to the trailer side air tank are provided. this air of the air tank for the brake to the pipe path of the emergency brake line supplied to the trailer side
When the air pressure in the
Close the road and connect the emergency brake line to the atmosphere
A manually or automatically operated cab control valve
A tractor braking device provided in a tractor cab . 2. A service brake air tank and a trailer brake air tank, wherein the brake valve is operated to supply air from the service brake air tank to the spring brake chamber to operate the service brake, and the trailer relay valve is used for the trailer brake air tank. of the service brake line for supplying a service brake air to the trailer side air, in the brake system of the tractor with a emergency brake line for supplying the air of the air tank for the trailer brake always trailer side of the air tank, the trailer Brake air tank and tractor side sp
It is connected to the ring brake chamber and is
Exhaust the air from the chamber to create a spring brake.
Activate and block the emergency brake line
Spring brake control valve and the spring brake control valve
The spring break connected to the brake line
Emergency control valve inactive
With a cab control valve that shuts off the rake line.
Provided in the tractor of key catcher Bed, air to the trailer from the emergency brake line
Supply the spring brake control valve and
In conjunction with each exhaust operation of the control valve
Emergency Brake line is cut off and
Cut valve that discharges air from the Jenshi brake line
The tractor braking device is characterized by comprising: 3. The brake device for a tractor according to claim 1, wherein a trailer pickup switch for detecting air pressure is provided in the emergency brake line.