JPH065935Y2 - Parking brake device for connected vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a parking brake device for an articulated vehicle.

<Prior Art> A parking brake device for a connected vehicle needs to be mechanically operated on the tractor side in order to ensure vehicle safety. The following are examples of conventional parking brake devices of this type (see Japanese Utility Model Publication No. 51-47210 and Japanese Utility Model Publication No. 61-11462).

That is, in a coupled vehicle that is not equipped with a manual center brake device, operating the cab control valve provided in the vehicle interior releases air from the spring chamber on the tractor side, and the elastic force of the spring controls the parking control. I try to secure power.

<Problems to be solved by the invention> However, in such a conventional parking brake device, the braking force at the time of parking is ensured only on the tractor side by operating the cab control valve. The braking force when parking was not great. Therefore, a parking brake device has been proposed in which two tractor valves are operated to simultaneously perform braking on the tractor side and the trailer side (Japanese Utility Model Publication No. 60-43465, Japanese Utility Model Publication 58).
-3716, etc.). However, in such a parking brake device, since two operation valves must be interposed, the circuit configuration becomes complicated and the cost becomes high. Also, because the trailer is braked by compressed air, if you park for a long time, the air may escape and the air pressure may weaken, resulting in insufficient braking force. It is necessary to have a structure in which only the spring brake on the tractor side that can obtain the braking force by the mechanical spring force can be used for braking. However, simultaneous operation of the tractor side and the trailer side by operating one operating valve and the tractor side only It is not possible to switch each operation position such as braking, and it is necessary to operate two operation valves, which is complicated.

The present invention has been made in view of such a situation, and in a vehicle without a center brake device, the braking force during parking can be increased, and the operation position can be easily switched with a simple circuit configuration. It is an object of the present invention to provide a parking brake device of.

<Means for Solving the Problems> Therefore, in the present invention, in a combined vehicle not provided with a manual center brake device, the first output port communicating with the spring brake working chamber of the tractor side spring chamber and the trailer side are connected. A manual control valve, comprising: a second output port connected to a synchro valve for performing a braking action of a brake device, wherein the discharge pressure of the first and second output ports is controlled by operating the manual control valve. Is increased to deactivate both braking by the brakes on the tractor side and the trailer side, and only the discharge pressure on the second output port is increased to activate braking by only the spring brake on the tractor side. Both the second operating position and the discharge pressures of the first and second output ports are reduced to a predetermined low pressure and the tractor A manual control valve having an operation position consisting of an intermediate position where the braking of the brakes on the trailer side and the trailer side is operated by a predetermined braking force is provided.

<Operation> According to such a configuration, by operating one manual control valve, the desired braking force is obtained by appropriately switching to each of the first operating position, the second operating position, and the parking intermediate position depending on the situation. be able to.

<Embodiment> An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In the figure, a spring chamber 2 for braking is provided on each of the rear wheels of the tractor.

When the brake pedal is depressed, the brake valve 3 operates according to the amount of depression and the compressed air is supplied to the quick release valve 4 and the relay valve 5 on the front wheel side. Then, on the front wheel side, compressed air is sent to the brake chamber 1 via the quick release valve 4 to perform braking.

On the other hand, on the rear wheel side, the relay valve 5 is actuated by the compressed air and compressed air is supplied from the reservoir tank 6 to the brake chamber side of the spring chamber 2 for braking.

In addition, the first output port A of the hand control valve 7 as a manual control valve provided in the vehicle compartment
Is communicated with the spring brake working chamber of the spring chamber 2 on the rear wheel side via the first double check 8 and the quick release valve 9.

Then, when the spring brake is not operated, the compressed air supplied from the hand control valve 7 is introduced into the spring brake working chamber of the spring chamber 2 via the first double check valve 8 and the quick release valve 9, and the braking by the spring is not operated. Becomes Also,
When the braking by the spring is not operated, the air in the spring brake operating chamber is discharged into the atmosphere from the quick release valve 9 by operating the hand control valve 7, and the braking by the spring is performed.

Next, the trailer side connected to the tractor will be described with reference to FIG. 2. Brake chambers 10 and 11 for braking are provided on the front wheel side and the rear wheel side of the trailer.

Then, the compressed air supplied from the brake valve 3 and the trailer control valve 12 provided in the vehicle compartment
And the compressed air supplied from the second double check valve 13 to the 2-way relay valve 14. Then, the two-way relay valve 14 supplies compressed air corresponding to the larger pressure of the compressed air to the emergency valve 15 on the trailer side. As a result, compressed air corresponding to the operating force of the brake valve 3 or the trailer control valve 12 is supplied from the reserve tank 16 to the brake chambers 10 and 11 via the emergency valve 15, and a desired braking force can be secured.

On the other hand, when the braking force for emergency or parking on the trailer side is not activated, high-pressure compressed air is introduced to the synchro valve 17 on the tractor side via the second output port B of the hand control valve 7. The synchro valve 17 is supplied with high-pressure compressed air from the reserve tank 6 via a third double check valve 18. As a result, high-pressure compressed air is supplied from the synchro valve 17 to the emergency valve 15 on the trailer side, and the emergency valve 15 is reserved in the brake chambers 10 and 11 depending only on the operating force of the brake valve 3 or the hand brake valve 12. Compressed air is supplied from the tank 6 to enable braking.

Further, during braking, when the air pressure supplied from the hand control valve 7 is reduced by operating the hand control valve 7, the synchro valve 17 releases the air supplied to the emergency valve 15 to the atmosphere. . As a result, the emergency valve 15 supplies compressed air from the reserve tank 16 to the brake chambers 10 and 11 in response to the operation of the hand control valve 7.

Here, regarding the output characteristic of the hand control valve 7, as shown in FIG. 3, both the discharge pressures of the first and second output ports A and B become high when the operating position of the handle is the first operating position. On the other hand, at the second operation position, the discharge pressure of the second output port B becomes high and the discharge pressure of the first output port A becomes zero. Further, at the intermediate position between the first operation position and the second operation position, as shown in FIG. 3, the discharge pressures of the first and second output ports A and B are at a predetermined low pressure according to the operation amount of the handle. It is changing as well.

19 is a compressor, 20 is a reserve tank, and 21 is a fourth
It is a double check valve.

Next, the operation will be described.

During normal traveling, the operating position of the hand control valve 7 is set to the first operating position to increase both the discharge pressures of the first and second output ports A and B.

As a result, on the tractor side, compressed air is introduced from the first output port A through the first double check valve 8 and the quick release valve 9 into the spring brake working chamber of the spring chamber 2 on the rear wheel side for braking by the spring. Is stopped. Also, the second output port B
Since compressed air is supplied to the synchro valve 17 from the reserve valve 6, compressed air is supplied from the reserve tank 6 by the emergency valve 15 via the synchro valve 17 on the trailer side, and emergency or parking braking is not activated. .

At the time of parking, the operating position of the hand control valve 7 is set to the second operating position so that only the discharge pressure of the second output port B on the trailer side is maintained at a high pressure and the braking on the trailer side is deactivated. As a result, the discharge pressure of the first output port A is reduced, and the air in the spring brake working chamber of the spring chamber 2 is released into the atmosphere via the quick release valve 9 to perform braking by the spring.

Then, after confirming the braking force at the time of parking by the braking force on the tractor side at this position, the operation position is set to the intermediate position C position. As a result, the discharge pressure of the second output port B also decreases, so that the air supplied to the emergency valve 15 via the synchro valve 17 is released from the synchro valve 17 into the atmosphere. Therefore, compressed air is supplied from the reserve tank 16 to the brake chambers 10, 11 on the trailer side via the emergency valve 15, and the brake chambers 10, 1
Braking by air pressure of 1 is started.

Therefore, the tractor side is braked by the spring and the trailer side is braked by the air pressure, so that the braking force for parking can be greatly increased as compared with the conventional example without providing a manual center brake device. The safety of the vehicle at the time can be improved. Further, the cost is reduced by the simple circuit configuration, and the operation of one hand control valve allows the first operation position,
Since the desired braking force can be obtained by appropriately switching to the second operation position and the intermediate parking position depending on the situation, the operation becomes easy.

As shown in FIG. 4, the output characteristic of the hand control valve 7 changes the discharge pressure of the first output port A in the same manner as in FIG. 3, and changes the discharge pressure of the second output port B to just before the second operation position. It may be maintained at a high pressure. At this time, when the braking force during parking is secured only on the tractor side, the second
It is desirable to provide a pressure switch for detecting a decrease in the discharge pressure of the output port B, and link this pressure switch with a buzzer that operates in conjunction with the door switch to prevent the driver from leaving the vehicle for a long time.

<Effects of the Invention> As described above, the present invention allows the tractor side and the trailer side to be braked during parking with a single manual control valve. The braking force of can be greatly improved. Furthermore, the cost is reduced by the simple circuit configuration, and the operation of one manual control valve
Since the desired braking force can be obtained by appropriately switching to each of the first operation position, the second operation position, and the parking intermediate position depending on the situation, the operation becomes easy.

[Brief description of drawings]

FIG. 1 is a block diagram of a tractor side showing an embodiment of the present invention,
2 is a configuration diagram of the same trailer side, FIG. 3 is a characteristic diagram of the same, and FIG. 4 is another characteristic diagram. 1,10,11 ... Brake chamber, 2 ... Spring chamber, 3 ... Brake valve, 5 ... Relay valve,
7: Hand control valve, 17: Sync valve

Claims (1)

[Scope of utility model registration request] 1. In a combined vehicle not provided with a manual center braking device, a first output port communicating with a spring brake working chamber of a tractor side spring chamber and a synchro valve for performing a braking action of a trailer side braking device. And a second output port connected to the tractor side and the trailer side by increasing the discharge pressures of the first and second output ports by operating the manual control valve. A first operating position where both braking by the brakes are inoperative, a second operating position where only the discharge pressure on the second output port side is increased and braking by only the spring brake on the tractor side is activated, and the first and second operating positions. Both the tractor side and trailer side brakes are braked by reducing both the discharge pressure of the output port to a specified low pressure. Predetermined intermediate position to actuate the braking force, the vehicle combination, characterized in that a manual control valve having an operating position consisting of the parking brake device.