JP2002079922A - Vehicle supporting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform long cargo loading/unloading work in an engine stopped condition by preventing a change in height of a truck with a change in load and keeping a height constant without supplying/exhausting an air to/from an air suspension device. SOLUTION: The vehicle supporting device 10 to be installed on the truck 1 equipped with the air suspension device 3 comprises a jack 11 to be mounted on a chassis frame 7 between a rear wheel 2 of the truck 11 and a rear bumper 8, a hydraulic cylinder 21 for extending the jack 11 from a storage position to a ground position, extension stopping means for stopping the extending operation of the hydraulic cylinder 21 concurrently with the grounding of the jack 11, and a power unit 30 capable of operating the hydraulic cylinder 21 during stopping the engine of the truck 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle support device for a vehicle such as a truck equipped with an air suspension device for preventing a change in the height of a vehicle due to a change in load and keeping the height constant. It is.

[0002]

2. Description of the Related Art Vehicles such as trucks equipped with an air-injection type air suspension device on the rear wheel axle have a height difference between a platform for loading and unloading cargo and a platform of the vehicle. Since the cargo platform can be adjusted to the same height as the platform by adjusting the height with the air suspension device, it is possible to easily get in and out of the cargo platform from the platform with a forklift or a cart.

In a vehicle such as a truck equipped with an air suspension device, the height of the loading platform changes according to the weight of a forklift or its load during loading work. Therefore, the ups and downs of the vehicle body are automatically detected. It operates to replenish air to the air tank, sends air to the air suspension device from there, lifts the vehicle body, and if the vehicle floats, it evacuates the air in the air suspension device and lowers the vehicle repeatedly, and the vehicle is always constant It is configured to maintain the height.

That is, in order for a vehicle to maintain a certain height,
It is necessary to constantly supply and discharge air from the air suspension device.

[0005]

However, when work is performed with the engine of the vehicle stopped, the air pump is stopped when the engine is stopped, so that air can be supplied only within the capacity of the air tank. If there is no more, it becomes impossible to adjust the vehicle height. Therefore, every time the air in the air tank becomes low, the engine must be refilled with the engine, which is troublesome, and it is difficult to load and unload the load for a long time with the engine stopped. Was.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problem in a vehicle such as a truck equipped with an air injection type air suspension device, and prevents a change in the height of the vehicle due to a change in load. Provided is a vehicle support device that can maintain a constant height without supplying or discharging air and that can easily perform long-time loading and unloading operations with an engine stopped. Aim.

[0007]

SUMMARY OF THE INVENTION A vehicle support device according to the present invention is provided in a vehicle equipped with an air suspension device, and includes a jack attached to a chassis frame between a rear wheel and a rear bumper of the vehicle. A hydraulic cylinder for extending the jack from the storage position to the contact position, a projecting suspension means for suspending the operation of extending the hydraulic cylinder by contacting the jack, and a power unit capable of operating the hydraulic cylinder when the engine of the vehicle is stopped. Solves the above problem.

In this vehicle support device, after adjusting the height of the vehicle with an air suspension device, the jack is extended from the retracted position to the contact position with a hydraulic cylinder. When the jack comes into contact with the ground, the overhang operation of the hydraulic cylinder is stopped by the overhang stop means, and thereafter the height of the vehicle is maintained at the initially adjusted height. This vehicle support device prevents the height of the vehicle from changing due to changes in the load, and keeps the height constant without supplying or discharging air from the air suspension device. Time loading and unloading operations can be easily performed.

[0009]

FIG. 1 is a side view showing a state in which a vehicle support device according to an embodiment of the present invention is provided on a truck, and FIG. 2 is a rear view showing a state in which the vehicle support device is provided on a truck. FIG. 3 is a sectional view taken along line AA of FIG. 2, FIG. 4 is a hydraulic circuit diagram of the vehicle support device, and FIG.

Here, the truck 1 is equipped with an air injection type air suspension device 3 on the axle of the rear wheel 2,
When there is a step between the platform 4 for loading and unloading the cargo and the platform 5 of the truck 1, the height can be adjusted by the air suspension device 3. That is, the bed 5
If the air suspension 6 is low, the air suspension 6
To raise the chassis frame 7 and
If the height is higher, the air in the air suspension device 3 is evacuated and the chassis frame 7 is lowered, so that the bed 5 can be adjusted to the same height as the platform 4.

The rear wheel 2 and the rear bumper 8 of the truck 1
Between them, a jack bracket 12 for mounting the jack 11 of the vehicle support device 10 is horizontally fixed below the left and right chassis frames 7, and a cylinder bracket 13 is provided at a central portion of the jack bracket 12. ing. The jack 11 is formed in an H shape by left and right legs 14 and 15 and a connection bracket 16 for connecting the both at a center portion.
At 18, it is rotatably connected to the jack bracket 12,
Floats 19 and 20 having widened ground contact areas are provided at the lower ends of the legs 14 and 15 so as to be swingable. A hydraulic cylinder 21 is mounted between the center of the connection bracket and the cylinder bracket 13 with pins 22 and 23.

A power unit 30 for driving a hydraulic cylinder is provided at the rear of the jack bracket 12.
Is installed. Further, a panel bracket 25 protrudes from the right end of the jack bracket 12 to the right side,
An operation panel 26 is provided at the tip of the panel bracket 25. The operation panel 26 includes the hydraulic cylinder 21
Is provided with an operation switch 27 for extending and retracting the jack 11 by extending and retracting the jack 11. The operation switch 27 includes
Toggle switch, lever, or push button switch, etc.
An easy-to-operate one can be appropriately selected and used.

The power unit 30 includes an oil tank 31 and
Hydraulic pump 32 and motor 3 for driving hydraulic pump 32
3, a solenoid valve 34 that is switched by an operation signal from an operation switch 27, and a relief valve 36 that regulates the pressure of a discharge pipe line 35 of the hydraulic pump 32.
The extension-side oil chamber 28 and the reduction-side oil chamber 29 of the hydraulic cylinder 21 are connected to a cylinder port of a solenoid valve 34 by a hydraulic hose 38 via a double pilot check valve 37. The discharge port 35 of the hydraulic pump 32 is connected to the pump port of the solenoid valve 34, and the return pipe 39 to the hydraulic tank 31 is connected to the return port.

The motor 33 is operated by a battery (not shown) of the truck 1. Even when the engine of the truck 1 is stopped, the motor 33 can supply hydraulic oil from the hydraulic pump 32 to the hydraulic cylinder 21 to extend and contract. it can. When the hydraulic cylinder 21 is contracted, the jack 11 is held at a storage position above the departure angle α of the truck 1 as shown in FIG. When the hydraulic cylinder 21 extends, the jack 11 rotates counterclockwise in the drawing and projects downward, and the float 1 of the jack 11
9 and 20 are grounded as shown in FIG.

The relief pressure of the relief valve 36 is adjusted so as to stop the extension of the hydraulic cylinder 21 when the jack 11 comes into contact with the ground. Since the hydraulic cylinder 21 does not continue to extend after the contact of the jack 11, the tension of the jack 11 is increased. The extension operation is stopped, and the chassis frame 7 is not lifted higher than the originally adjusted height. The double pilot check valve 37 prevents the extension of the hydraulic cylinder 21 in the retracted state and the contraction of the hydraulic cylinder 21 in the grounded state. This also prevents the hydraulic cylinder 21 from expanding and contracting due to oil leakage when the hydraulic hose 38 is damaged.

When loading or unloading a load onto the loading platform 5 of the truck 1, the truck 1 is first loaded and unloaded.
The vehicle is stopped at the platform 4 so that it can be carried out, and the height is adjusted by the air suspension device 3 so that the height of the loading platform 5 matches the height of the platform 4.
Next, the operation switch 27 of the operation panel 26 is operated to the overhang side. Then, an overhang signal is sent to the solenoid 34b, the solenoid valve 34 is switched, and pressure oil is supplied from the discharge pipe 35 of the hydraulic pump 32 to the extension-side oil chamber 28 of the hydraulic cylinder 21, so that the hydraulic cylinder 21 is extended. Then, the jack 11 is extended.

After confirming that the floats 19 and 20 of the jack 11 are completely grounded, the operation switch 27 of the operation panel 26 is returned to the neutral position, the overhang operation is completed, and the engine of the truck 1 is stopped. After the height of the engine is adjusted by the air suspension device 3,
It may be stopped immediately. Then, the load is loaded and unloaded using a forklift, a cart, or the like. During the loading / unloading operation, the load applied to the bed 5 of the truck 1 changes, but the vehicle support device 10 is an incompressible medium unlike the air suspension device 3 that uses air, which is a compressible medium. Since it is supported by the hydraulic cylinder 21 using oil, the height can be kept constant without supplying or discharging air. Therefore, it is possible to easily perform a long-time load loading / unloading operation with the engine stopped. Needless to say, the present invention can be used when loading and unloading cargo without using a forklift or a cart.

When the loading / unloading of the load is completed, the operation switch 27 is operated to the storage side. Then, the solenoid 34
a, the solenoid valve 34 is switched, and the hydraulic pump 3 is inserted into the reduction-side oil chamber 29 of the hydraulic cylinder 21.
Since the pressure oil is supplied from the second discharge pipe 35, the hydraulic cylinder 21 is reduced and the jack 11 is stored in the storage position shown in FIG. 5, so that the truck 1 can run.

[0019]

As described above, according to the vehicle support device of the present invention, the height of the vehicle is prevented from changing due to the change in load, and the height of the air suspension device is reduced without supplying or discharging air. Can be kept constant, and a long-time load loading / unloading operation can be easily performed with the engine stopped.

[Brief description of the drawings]

FIG. 1 is a side view showing a state where a vehicle support device according to an embodiment of the present invention is provided on a truck.

FIG. 2 is a rear view showing a state where the vehicle support device is provided on a truck.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a hydraulic circuit diagram of the vehicle support device.

FIG. 5 is an explanatory diagram of a stored state of the vehicle support device.

[Explanation of symbols]

 Reference Signs List 1 truck 2 rear wheel 3 air suspension device 4 platform 5 carrier 6 air tank 7 chassis frame 8 rear bumper 10 vehicle support device 11 jack 12 jack bracket 13 cylinder bracket 14 leg 15 leg 16 connection bracket 17 pin 18 pin 19 float 20 float 21 hydraulic Cylinder 22 pin 23 pin 25 Panel bracket 26 Operation panel 27 Operation switch 28 Extension-side oil chamber 29 Reduction-side oil chamber 30 Power unit 31 Oil tank 32 Hydraulic pump 33 Motor 34 Solenoid valve 34a Solenoid 34b Solenoid 35 Discharge line 36 Relief valve 37 Double Pilot check valve 38 Hydraulic hose 39 Return line

Claims (1)

[Claims] 1. A vehicle support device provided on a vehicle equipped with an air suspension device, comprising: a jack mounted on a chassis frame between a rear wheel and a rear bumper of the vehicle; A vehicle support device comprising: a hydraulic cylinder to be extended; an extension suspension means for suspending the operation of extending the hydraulic cylinder by grounding a jack; and a power unit capable of operating the hydraulic cylinder when the engine of the vehicle is stopped.