JPH1016736A - Emergency brake and parking brake for trailer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a parking brake of a trailer brake device to be automatically controlled in cooperation with an operation of a parking brake of a tractor even if a driver once does not ride off the tractor to operate a parking control valve of the trailer present outside a cabin when the parking brake of the trailer is operated. SOLUTION: A cut valve 27 is arranged between a parking control valve 25 and a pressure control valve 26 of a parking brake control system passage placed between a spring brake chamber 20 and an air tank 23 of a trailer brake device. This cut valve 27 is connected to an emergency brake line E at the trailer placed more upstream side of a relay emergency valve 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a trailer emergency and parking brake device.

[0002]

2. Description of the Related Art Conventionally, a mechanical parking brake (a center brake mounted on a propulsion shaft) and a spring brake for braking a wheel are controlled by a parking brake lever, and an emergency brake control valve is used to control the spring brake operating air system of the tractor. The tractor and the trailer brake device that control the emergency brake operation control air system of the trailer in conjunction with the following are configured as follows.

That is, as shown in FIG. 3, the brake device on the tractor side includes a service brake line piped from a service brake air tank 1 to a spring brake chamber 7 via a brake valve 3 and a relay valve 4, and a spring brake air tank 2 Emergency brake control valve 12, spring brake control valve 1 operated by parking brake lever 10
1, a parking brake control circuit for supplying and discharging air to and from the spring brake chamber 7 through a double check valve 5 and a spring brake relay valve 6, and a cut valve 15 connected to a trailer circuit by a pipe 13 from the emergency brake control valve 12. And an emergency brake operation control air system of a trailer of a trailer air tank 16 connected to the cut valve 15 by piping.

As shown in FIG. 4, there is also a circuit configuration in which the emergency brake control valve 12 is eliminated from FIG. 3 and the spring brake air tank 2 is directly connected to the spring brake control valve 11.

As a parking brake alarm device, in both of FIGS. 3 and 4, a low pressure switch 9 for detecting a parking brake is provided in a pipe 8 connecting the spring brake relay valve 6 and the spring brake chamber 7; A low pressure switch 18 for operating a warning lamp and a buzzer is provided on a pipe 14 connected to a spring brake relay valve 6 via a spring brake control valve 11 operated by a parking brake lever 10 and a double check valve 5.

As shown in FIG. 5, the brake device on the trailer side includes a spring brake chamber 20 and an air tank 23, and an emergency brake from the service brake line S on the tractor side and the cut valve 15 on the tractor side. A line E is connected to supply air to the spring brake chamber 20 via a pipe 22 to perform a braking operation.
4 to supply air to the spring brake chamber 20 through the air tank 23, the parking control valve 25 and the pressure control valve 26 to compress the spring. When the brake is deactivated and the parking brake is activated on the trailer, the parking control valve 25 is activated to exhaust the air in the spring brake chamber 20 compressing the spring, and the brake is activated by the spring. Configuration.

[0007]

In the conventional trailer emergency and parking brake system, when the emergency brake control valve 12 on the tractor side is actuated, the air in the piping of the emergency brake line E is transmitted from the cut valve 15. Is discharged and the trailer air tank 1
The trailer spring brake chamber 20 is braked in the same manner as the service brake by the emergency brake operation control air system of the trailer 6. However, when the parking brake is operated by the parking brake lever 10, only the tractor operates the parking brake. In order to operate the parking brake on the trailer, the driver needs to get off and operate the parking control valve 25 of the trailer provided on the trailer side. In addition, when the air supply source on the trailer side is lost such as a failure of the emergency brake line E, the braking action of the trailer is affected.

It is an object of the present invention to provide an emergency and parking brake device for a trailer in which the parking brake of a trailer brake device can be automatically controlled in association with the parking brake operation of a tractor. Another object is to simplify the circuit of the tractor brake device.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a spring brake operating air system and an emergency brake control air system for braking a mechanical parking brake by a parking brake lever on a tractor side. A tractor brake device with a system is provided, a spring brake chamber and an air tank are provided on the trailer side, and the service brake line and the emergency brake line on the tractor side are connected to the service brake line and the emergency brake line on the trailer side. A relay emergency valve that supplies air to the spring brake chamber and supplies air to the air tank; and a relay emergency valve that supplies air to the air tank, a parking control valve, and a pressure control valve. In a trailer brake device having a parking brake control system for supplying and discharging air to and from a spring brake chamber, a cut valve is provided between a parking control valve and a pressure control valve in a parking brake control system of the trailer brake device. The cut valve and the emergency brake line on the trailer side upstream of the relay emergency valve are connected, and the parking brake of the trailer brake device can be controlled in conjunction with the operation of the parking brake lever of the tractor brake device. It is characterized by the following.

Also, a tractor brake device is provided on the tractor side with a spring brake operating air system for braking the mechanical parking brake by a parking brake lever and an emergency brake control air system, and a spring brake chamber is provided on the trailer side. With an air tank,
The service brake line and the emergency brake line on the tractor side are coupled to the service brake line and the emergency brake line on the trailer side, respectively, and supply air to the spring brake chamber to perform a braking operation. Trailer brake device, comprising: a relay emergency valve that supplies air to the spring brake chamber; and a parking brake control system that supplies and discharges air to and from the spring brake chamber via the air tank, a parking control valve, and a pressure control valve. A cut valve is provided between the parking control valve and the pressure control valve in the parking brake control system of the present invention, and a train upstream of the cut valve and the relay emergency valve is provided. Connected to the emergency brake line on the side of the motor, a double check valve is provided between the cut valve and the pressure control valve, and air is supplied to the spring brake chamber downstream of the double check valve and the relay emergency valve. And a parking brake lever of the tractor brake device connected to the parking brake lever of the tractor brake device to control the parking brake of the trailer brake device.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. The circuit configuration of the tractor brake device according to the present invention is shown in FIG. That is, a service brake line piped from the service brake air tank 1 to the spring brake chamber 7 via the brake valve 3 and the relay valve 4, and a spring brake control valve 11 operated by the parking brake lever 10 from the spring brake air tank 2, A parking brake control circuit for supplying and discharging air to and from the spring brake chamber 7 via a check valve 5 and a spring brake relay valve 6;
Emergency brake operation control air of the trailer of the cut valve 15 connected to the trailer circuit by the pipe 14 from the spring brake control valve 11 and the pipe 13 branched from the trailer air tank 16 connected to the cut valve 15 by the pipe It is a configuration with the system.

[0012] The brake device of the trailer is basically the same as the conventional configuration. That is, as shown in FIG. 4, the spring brake chamber 20 and the air tank 23
The service brake line S on the tractor side and the emergency brake line E from the cut valve 15 on the tractor side are connected, and air is supplied to the spring brake chamber 20 via a pipe 22 to perform a braking operation. And a relay emergency valve 21 for supplying air to the air tank 23 via a pipe 24;
The air tank 23 and the parking control valve 2
Normally, air is supplied to the spring brake chamber 20 through the pressure control valve 26 and the pressure control valve 26 to compress the spring to deactivate the braking, and to activate the parking brake on the trailer, the parking control valve 25 is activated. Thus, the air in the spring brake chamber 20 compressing the spring is exhausted, and the spring is brought into a braking operation state by the spring.

In the first embodiment of the present invention, as shown in FIG. 1, the parking brake control system on the trailer side, that is, the air tank 23 and the parking control valve 2 are used.
5 and a pressure control valve 26, a cut valve 27 is provided between the parking control valve 25 and the pressure control valve 26, and the cut valve 27 and the emergency on the trailer side upstream of the relay emergency valve 21 are provided. This is a configuration in which a pipe 31 of the juncture brake line E is connected by a pipe 28.

When the parking brake lever 10 of the tractor brake device is actuated, a cut valve 15 and a cut valve 15 connected to a trailer circuit by a pipe 13 are provided.
The air signal from the pipe 31 of the emergency brake line E of the trailer connected to the vehicle controls the cut valve 27 of the parking brake control system of the trailer via the pipe 28 via the pipe 28, and the spring tank 2 from the air tank 23.
The supply of air for compressing the spring to 0 is shut off, and the air for compressing the spring supplied to the spring brake chamber 20 is discharged to the atmosphere from the cut valve 27.

Thus, the spring brake chamber 20 brings the trailer wheel into a braking state by the spring force, and automatically operates the parking brake on the trailer in conjunction with the operation of the parking brake lever 10 of the tractor brake device. Therefore, when the parking brake lever 10 of the tractor brake device is actuated, the driver can get off the vehicle without operating the parking control valve 25 of the trailer provided on the trailer side existing outside the cab. Parking braking can be performed mechanically.

Further, even if the pressure in the trailer air tank 16 drops to zero, although extremely, the parking brake operation by the spring brake chamber 20 is continued by the operation of the pressure control valve 26. Further, as shown in FIG. 5, the emergency brake control valve 12 is not required for the tractor-side brake device.

As shown in FIG. 2, in the second embodiment of the present invention, the parking control system of the trailer brake device, that is, the system of the air tank 23, the parking control valve 25, and the pressure control valve 26 is controlled by the parking control system. A cut valve 27 is provided between the valve 25 and the pressure control valve 26, and the cut valve 27 is connected to a pipe 31 and a pipe 28 of the emergency brake line E upstream of the relay emergency valve 21.

Further, a double check valve 29 is provided between the cut valve 27 and the pressure control valve 26 to supply air to the spring brake chamber 20 downstream of the double check valve 29 and the relay emergency valve 21. This is configured to be connected via an air supply pipe 22 and a pipe 30 that perform a braking operation.

Similarly to the first embodiment, when the parking brake lever 10 of the tractor brake device is actuated, the cut valve 15 and the cut valve 15 connected to the trailer circuit by the pipe 13 are also provided in the second embodiment of the present invention. An air signal from the pipe 31 of the emergency brake line E of the trailer connected to the valve 15 controls the cut valve 27 of the parking brake control system via the pipe 28 via the pipe 28, and from the air tank 23 via the double check valve 29. The supply of air for compressing the spring to the spring brake chamber 20 is cut off, and the air for compressing the spring supplied to the spring brake chamber 20 is discharged to the atmosphere from the cut valve 27.

Thus, the spring brake chamber 20 puts the trailer wheel into a braking state by the spring force, and automatically operates the parking brake on the trailer in conjunction with the operation of the parking brake lever 10 of the tractor brake device. Therefore, when the parking brake lever 10 of the tractor brake device is actuated, the driver does not need to get off and operate the parking control valve 25 of the trailer provided on the trailer side existing outside the cab to operate the trailer. Parking braking can be performed mechanically.

Even if the pressure in the trailer air tank 16 drops to zero, although extremely, the parking brake operation by the spring brake chamber 20 is continued by the operation of the pressure control valve 26.

When a failure occurs in the pipe 31 for supplying air from the emergency line E to the air tank 23 through the relay emergency valve 21, the parking brake lever 10 of the tractor brake device is operated to park the trailer. Even if an attempt is made to release the brake braking, the spring in the spring brake chamber 20 cannot be compressed to release (deactivate) the brake. However, in the second embodiment of the present invention, the relay due to the failure described above is used. By the action of the emergency valve 21, the air is supplied to the spring brake chamber 20 downstream of the relay emergency valve 21 to perform the braking operation. 20 to compress the spring But to allow the release of the trailer parking brake because it is supplied.

Further, in the second embodiment, even if there is no failure, the simultaneous operation of the parking brake and the service brake of the trailer is prevented by the pipe 30 and the double check valve 29.
Therefore, the brake device can be protected.

[0024]

As described above, according to the present invention, the parking brake of the trailer brake device can be automatically controlled in conjunction with the operation of the parking brake of the tractor, and the driver once gets off and stays outside the cab. This eliminates the need for troublesome operation of the trailer parking control valve.
The emergency brake control valve is not required for the tractor brake device, and the circuit can be simplified.

The configuration has an advantage that it can be realized by a simple structure incorporating an existing valve.

[Brief description of the drawings]

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

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

FIG. 3 is a circuit configuration diagram of a tractor brake device that controls the device of the present invention.

FIG. 4 is a circuit configuration diagram of a tractor brake device for controlling the device of the present invention.

FIG. 5 is a circuit configuration diagram of a conventional trailer brake device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Service brake air tank 2 Spring brake air tank 3 Brake valve 4 Relay valve 5 Double check valve 6 Spring brake relay valve 7 Spring brake chamber 8 Piping 9 Low pressure switch for parking brake detection 10 Parking brake lever 11 Spring brake control valve 12 Emergency brake control Valve 13 Piping 14 Piping 15 Cut valve 16 Trailer air tank 20 Spring brake chamber 21 Relay emergency valve 23 Air tank 25 Parking control valve 26 Pressure control valve 27 Cut valve 29 Double check valve

Claims (2)

[Claims] 1. A tractor brake device having a spring brake operating air system for operating a mechanical parking brake by a parking brake lever on a tractor side and an emergency brake control air system, and a spring brake chamber on a trailer side. An air tank, and a service brake line and an emergency brake line on the tractor side are coupled to the service brake line and the emergency brake line on the trailer side, respectively, and supply air to the spring brake chamber to perform a braking operation. A relay emergency valve for supplying air to the air tank, and a parking brake for supplying and discharging air to and from the spring brake chamber via the air tank, a parking control valve and a pressure control valve. In a trailer brake device having a control system, a cut valve is provided between a parking control valve and a pressure control valve of a parking brake control system of the trailer brake device, and a cut valve is provided between the cut valve and the relay emergency valve. An emergency and parking brake of a trailer, which is connected to an emergency brake line on an upstream trailer side and enables control of a parking brake of a trailer brake device in conjunction with an operation of a parking brake lever of a tractor brake device. apparatus. 2. A tractor brake device including a spring brake operating air system for operating a mechanical parking brake by a parking brake lever on a tractor side and an emergency brake control air system, and a spring brake chamber on a trailer side. An air tank, and a service brake line and an emergency brake line on the tractor side are coupled to the service brake line and the emergency brake line on the trailer side, respectively, and supply air to the spring brake chamber to perform a braking operation. A relay emergency valve for supplying air to the air tank, and a parking brake for supplying and discharging air to and from the spring brake chamber via the air tank, a parking control valve and a pressure control valve. In a trailer brake device having a control system, a cut valve is provided between the parking control valve and the pressure control valve of the parking brake control system of the trailer brake device, and a cut valve is provided between the cut valve and the relay emergency valve. An emergency brake line on the trailer side on the upstream side is connected, a double check valve is provided between the cut valve and the pressure control valve, and a spring brake chamber downstream of the double check valve and the relay emergency valve. A trailer emergency stop and a trailer brake, which are connected to an air supply system path that supplies air to the brakes to perform a braking operation, so that the parking brake of the trailer brake device can be controlled in conjunction with the operation of the parking brake lever of the tractor brake device. Parking Over key equipment.