JP2000001879A - Parking brake equipment for self-loader vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To permit the stabilization of a self-loader vehicle even though the extending operation of an outrigger has been completed and its body is set to a sloped state. SOLUTION: By operating a completion switch 41 located outside a vehicle room, the operation of W/P release valve 31 is stopped based on the command from a controller 32, and a damping force is given to rear wheels 9. By doing this, the self-loader vehicle is stabilized and the self loader vehicle can be stabilized even though its body is set to a sloped state after completing the extending operation of the outrigger 4 thereby permitting safe loading and unloading work. Also, by operating the completion switch 41 located outside the vehicle room, a damping force is given to the rear wheels 9 of the sloped self-loader vehicle, so that the operation is made easier and the usefulness can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parking brake device for a self-loader vehicle in which a vehicle body is tilted by extending an outrigger and floating a front wheel.

[0002]

2. Description of the Related Art A self-loader vehicle for transporting a vehicle for construction or the like will be described with reference to FIG. As shown in the figure, an outrigger 4 is provided between the cabin 2 and the carrier 3 of the self-loader vehicle 1. The outrigger 4 is configured such that the leg portion 6 expands and contracts by operating the operation lever 5. Loading of the vehicle 10 on the bed 3 and the vehicle 1 from the bed 3
When lowering 0, as shown in FIG. 4, the self-loader vehicle 1 is tilted by operating the operation lever 5 to extend the leg 6 and float the front wheel 7. By inclining the self-loader vehicle 1, the carrier 3 and the road surface 8 are brought into a continuous state, and the vehicle 10 self-propelled to load onto the carrier 3 or to carry the carrier 3.
Unloading from

[0003]

The parking brake device of the self-loader vehicle 1 generates a braking force on the rear wheels 9. For this reason, as shown in FIG. 4, when the self-loader vehicle 1 is inclined by extending the legs 6 of the outrigger 4 while the parking brake device is operated, the self-loader is centered on the grounding portion of the rear wheel 9. The vehicle 1 tilts and a rotational force acts on the rear wheel 9 in the locked state.

When a rotational force acts on the rear wheel 9 in the locked state, a reaction force of the displacement force of the rear wheel 9 acts on the operation of the leg 6 of the outrigger 4, and the leg 6 of the outrigger 4 expands and contracts. Since an excessive load may be applied and smooth operation of the outrigger 4 may become difficult, it is conceivable to perform an operation such as releasing the braking force of the rear wheel 9 when the outrigger 4 functions. However, when the braking force of the rear wheel 9 is released,
After the extension operation of the outrigger 4 is completed, the self-loader vehicle 1 is in a state of being braked only by the ground resistance of the leg 6, and the self-loader vehicle is loaded when loading or unloading the vehicle 10 from the loading platform 3. 1 may become unstable.

The present invention has been made in view of the above circumstances, and provides a parking brake device for a self-loader vehicle that can stabilize the self-loader vehicle even when the outrigger is extended and the vehicle body is inclined. The purpose is to.

[0006]

According to the present invention, there is provided a self-loader vehicle in which a vehicle is tilted by extending an outrigger to float a front wheel and to provide an external operation provided outside a vehicle compartment. By operating the means, a braking force is applied to the rear wheels by the parking braking means based on a command from the control means.

[0007] As a specific mode, parking brake means for applying a braking force to the rear wheel in conjunction with the operation state of the parking brake operation means provided in the vehicle compartment is provided, and the parking brake operation means is operated in the operating state. Parking brake forced control means for controlling the braking state of the parking brake means with priority is provided, and when the outrigger functions, the braking operation of the parking brake means is released regardless of the operation state of the parking brake operation means, and the parking brake forced control is performed. When the extension operation of the outrigger is completed in a state where the parking brake means is released from braking by the means, the parking brake means is braked in conjunction with the operation of the outside operation means. For this reason, when the outrigger functions, the braking force of the rear wheel is released, the rear wheel rotates and the load on the outrigger is reduced, and when the outrigger extension operation is completed and the operation means outside the vehicle is operated, the rear wheel is operated. The self-loader vehicle in the inclined state is stabilized by the braking force acting on the front wheels and the front wheels rise.

[0008]

1 and 2 show a schematic configuration of a parking brake device for a self-loader vehicle according to an embodiment of the present invention. FIG. 1 shows a state where a braking force is released. Reference numeral 2 denotes a state in which a braking force is applied. Since the configuration of the self-loader vehicle is shown in FIGS. 3 and 4, the same members are denoted by the same reference numerals and description thereof is omitted.

As shown in the figure, a pair of brake shoes 21 and a return spring 22 for contracting the pair of brake shoes 21 are provided on the rear wheel 9, and the brake shoes 21 are contracted by the urging force of the return spring 22. The braking force is released. When the brake shoe 21 expands against the biasing force of the return spring 22, the braking force is applied.

An expander 23 is provided on the pair of brake shoes 21, and the wedge 2 is attached to the expander 23.
4 inserts the brake shoe 21 against the biasing force of the return spring 22. The wedge 24 is urged by the spring 26 in the brake chamber 25 toward the side where the wedge 24 is inserted into the expander 23, and when the air is supplied to the brake chamber 25, the wedge 24 comes off the expander 23 against the urging force of the spring 26. ing.

The brake chamber 25 is connected to an air tank 28 via a hand control valve 29 as a parking brake operating means and a relay valve 27. When the hand control valve 29 is operated to a non-braking position,
Air tank 2 via hand control valve 29
The relay valve 27 is actuated by the air from 8 and the air from the air tank 28 is supplied to the brake chamber 25 (solid arrow in FIG. 1). Hand control valve 29
Is operated to the braking position, the operating air of the relay valve 27 is released from the hand control valve 29 to the atmosphere, and the air in the brake chamber 25 is released from the relay valve 27 to the atmosphere (solid arrow in FIG. 2).

The wheel park (W / P) brake having the above-described structure is a parking braking means. In other words, the pair of brake shoes 21 expand and contract in conjunction with the operation of the hand control valve 29 as the parking brake operating means, so that the braking force is applied to the rear wheel 9 and the braking force of the rear wheel 9 is released. It has become.

On the other hand, in a flow path between the hand control valve 29 and the relay valve 27, a wheel park release valve (W / P release valve) 31 is provided as a parking brake forced control means, and the W / P release valve 31 is provided. , The air from the air tank 28 can be supplied to the relay valve 27 to operate the relay valve 27 irrespective of the operation state of the hand control valve 26. W /
The P release valve 31 is connected to the controller 3 as control means.
2 to release the braking force of the rear wheel 9.

That is, when the hand control valve 29 is operated to the braking position and the air in the brake chamber 25 is released to the atmosphere from the relay valve 27, and the brake shoe 21 is expanded and in the braking state, the controller 32 When the W / P release valve 31 is actuated according to the command of the above, the air from the air tank 28 is released from the W / P release valve 31.
Is sent to the relay valve 27 via the
Operates. Therefore, the hand control valve 29
Is operated to the braking position, the air from the air tank 28 is sent to the brake chamber 25 (dotted arrow in FIG. 2), and the wedge 24 comes off the expander 23 against the urging force of the spring 26, and the pair of brakes Shoe 2
1 is contracted, and the braking force of the rear wheel 9 is released.

The front wheels 7 are extended by the extension of the legs of the outriggers 4.
Is raised and the outrigger 4 is in a functioning state, the information is sent to the controller 32, and the controller 32 operates the W / P release valve 31. The determination of the state in which the outrigger 4 is functioning is performed by detecting the stroke of the leg 6 or the working fluid pressure, detecting the load condition of the front wheel 7,
Alternatively, the detection is performed by detecting the stroke of the suspension.

On the other hand, in the vicinity of the outrigger 4, an end switch 41 is provided outside the vehicle cabin as an outside operation means, and when the extension operation of the outrigger 4 is completed and the tilting operation of the self-loader vehicle is completed, Exit switch 41
By pressing, the operation of the W / P release valve 31 is released via the controller 32.

The operation of the parking brake device for a self-loader vehicle having the above configuration will be described.

During running, the wheel park (W / P) brake is not operated, as shown in FIG. That is, the hand control valve 29 is operated to the non-braking position, the relay valve 27 is operated by air from the air tank 28,
Air from the air tank 28 is supplied to the brake chamber 25. When air is supplied to the brake chamber 25, the wedge 24 comes off the expander 23 against the urging force of the spring 26, and the brake shoe 2
1 is contracted by the urging force of the return spring 22 and the braking force is released.

When the self-loader vehicle 1 is stopped, FIG.
Operate the W / P brake as shown in. That is, the hand control valve 29 is operated to the braking position, and the operating air of the relay valve 27 is supplied to the hand control valve 2.
9 is released to the atmosphere and the brake chamber 2
5 is released from the relay valve 27 to the atmosphere. In a state where air is released from the brake chamber 25,
The wedge 24 is inserted into the expander 23 by the urging force of the spring 26, and the brake shoe 21 expands against the urging force of the return spring 22 to be in a state where a braking force is applied.

When the driver goes out of the passenger compartment and operates the operation lever 5 to operate the outrigger 4 in order to tilt the self-loader vehicle 1 in a state where the W / P brake is operated, the leg 6 And the front wheel 7 starts to float. Front wheel 7
Is detected, the leg 6 is considered to be in contact with the ground, the information is sent to the controller 32, and the W / P release valve 31 is operated according to a command from the controller 32.

When the W / P release valve 31 is operated while the hand control valve 29 is being operated to the braking position, the air from the air tank 28 is released from the W / P release valve 31.
Is sent to the relay valve 27 via the
Operates. Therefore, the hand control valve 29
Is operated to the braking position, the air from the air tank 28 is sent to the brake chamber 25 (dotted arrow in FIG. 2), and the wedge 24 comes off the expander 23 against the urging force of the spring 26, and the pair of brakes Shoe 2
1 is contracted, and the braking force of the rear wheel 9 is released.

Accordingly, the outrigger 4 functions and the leg 6
Is grounded, the braking force of the rear wheel 9 is released even if the hand control valve 29 is operated to the braking position, and even if the self-loader vehicle 1 is tilted by the operation of the outrigger 4, the rear wheel 9 rotates and shifts. Power is absorbed. For this reason,
The reaction force of the displacement force of the rear wheel 9 does not act on the movement of the leg 6 of the outrigger 4, and no excessive load is applied to the extension operation of the leg 6 of the outrigger 4.

When the extension of the leg 6 of the outrigger 4 is completed and the tilting operation of the self-loader vehicle is completed, the rear wheel 9 is again turned on.
To apply a braking force to the vehicle to stabilize the self-loader vehicle. That is, when the end switch 41 is pressed, the controller 3
The operation of the W / P release valve 31 is released via 2. As a result, the operating air of the relay valve 27 is released from the hand control valve 29 to the atmosphere, and the air in the brake chamber 25 is released from the relay valve 27 to the atmosphere. Granted.

Therefore, when the leg 6 of the outrigger 4 extends and the tilting operation of the self-loader vehicle 1 is completed, the braking force is applied to the rear wheel 9 again, and the tilted self-loader vehicle stabilizes. For this reason, safe unloading and loading work can be performed. Further, since the end switch 41 is provided outside the vehicle, the operation is easy and the convenience is improved.

When the leg 6 of the outrigger 4 is contracted, the W / P release valve 31 is actuated to release the braking force on the rear wheel 9, and the contraction of the leg 6 is completed, so that the self-loader vehicle is released. When 1 returns to the original state (the outrigger 4 is in the ground state),
The W / P release valve 31 is deactivated, and the W / P brake is activated in conjunction with the braking position of the hand control valve 29.

In the above-described parking brake system for a self-loader vehicle, the W / P brake is deactivated when the leg 6 of the outrigger 4 is extended, and the braking force of the rear wheel 9 is released. The load is reduced to enable a smooth lift operation and prevent the rear wheels 9 from shifting. Further, when the leg 6 is extended and the tilting operation of the self-loader vehicle 1 is completed, a braking force can be applied to the rear wheel 9 again by pressing the end switch 41. Can be stabilized.

In the above-described embodiment, an example in which the end switch 41 is provided as the outside operation means has been described. However, the operation lever 5 for operating the outrigger 4 is applied as the outside operation means, and the leg 6 is extended. It is also possible to configure so that the operation of the W / P release valve 31 is released when the operation lever 5 is switched from the operation position to the non-operation position.

In the above embodiment, the brake device is configured to release the braking force of the rear wheel 9 by operating the W / P release valve 31 according to a command from the controller 32 when the leg 6 is assumed to be in contact with the ground. As described above, when the leg 6 touches the ground, the W / P brake is manually released and the outrigger 4 is released.
It is also possible to apply the present invention to a brake device that reduces the load on the vehicle. In this case, regardless of the manual release of the W / P brake, the braking force is applied by pressing the end switch 41.

[0029]

According to the parking brake device for a self-loader vehicle of the present invention, a braking force is applied to the rear wheels by the parking brake means based on a command from the control means by operating the outside operation means provided outside the vehicle compartment. As a result, the braking force is applied to the rear wheels, and the self-loader vehicle is stabilized. As a result, even when the extension operation of the outrigger is completed and the vehicle body is inclined, the self-loader vehicle can be stabilized, and safe loading / unloading and loading operations can be performed. Further, since the braking force is applied to the rear wheel of the inclined self-loader vehicle by operating the outside operation means, the operation is easy and the convenience is improved.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a parking brake device for a self-loader vehicle according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a parking brake device for a self-loader vehicle according to an embodiment of the present invention.

FIG. 3 is a schematic configuration diagram of a self-loader vehicle.

FIG. 4 is a schematic configuration diagram of a self-loader vehicle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Self-loader vehicle 4 Outrigger 6 Leg 9 Rear wheel 21 Brake shoe 22 Return spring 23 Expander 24 Wedge 25 Brake chamber 26 Spring 27 Relay valve 28 Air tank 29 Hand control valve 31 Wheel park release valve (W / P release valve) 32 Controller 41 Exit switch

Claims (1)

[Claims] 1. A parking brake device for a self-loader vehicle that inclines a vehicle by extending an outrigger to lift a front wheel and to apply a braking force to a rear wheel by operating an external operation means provided outside the vehicle compartment. A parking brake device for a self-loader vehicle, comprising: a parking brake unit that performs the braking operation; and a control unit that performs a braking operation of the parking brake unit in conjunction with an operation of the outside operation unit in a braking released state.