JPH05155316A - Method for keeping body of vehicle with outriggers gorizontal - Google Patents

Abstract

PURPOSE:To elevate all the wheels of a vehicle in the air and keep horizontally the body of the vehicle by using the hydraulic jack fitted to each of the outriggers set up at four positions of the front and rear sides of the vehicle. CONSTITUTION:After setting each of all four hydraulic jacks 18's on the ground, discrimination between the hydraulic jack positioning the highest level among four hydraulic jacks and the remaining three ones is performed, and by using the hydraulic jack 18 positioning the highest level as the base level, the hydraulic oil is supplied into an extension oil chamber 18a of each of the remaining three ones and the supply is stopped when both first and second diagonal clinometers 32 and 33 detect horizontality with all the wheels on the ground. Thereafter the hydraulic oil of same quantity is supplied to the extension oil chamber 18a of each of all the hydraulic jacks 18's through each of the flow controllers 29's with pressure compensation so that the body can be lifted up to an elevation where all the wheels are free from the ground in same lifting pace of these jacks.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention raises all wheels to the ground with outriggers on the front, rear, left and right of a vehicle body in order to prevent a vehicle such as a fire truck with a ladder or a truck crane from falling during work. And a correction method for keeping the body horizontal. It should be noted that the term “floating a wheel above the ground” includes not only the case where the wheel is separated from the ground above, but also the case where the reaction force due to a spring not in the wheel does not act on the vehicle body even if the wheel is in contact with the ground.

[0002]

2. Description of the Related Art From Japanese Patent Publication No. 61-52712,
In the vehicle body of the working vehicle as described above, a front vehicle width inclinometer that detects the inclination in the vehicle width direction that connects the two front left and right front outriggers and a vehicle width direction that connects the two rear left and right outriggers A rear vehicle width inclinometer that detects the inclination, three inclinometers that detect the inclination in the vehicle length direction, and an arithmetic control device that calculates by receiving the signals of these three inclinometers are provided. In order to detect the inclination in the vehicle width direction and the vehicle length direction before and after the vehicle body parked for this purpose, the three inclinometers detect signals from the three inclinometers and the arithmetic and control unit receives the four outrigger hydraulic pressures. It is known that the amount of oil supplied to the extension side oil chamber of the jack by the hydraulic circuit for expansion and contraction is controlled by the arithmetic and control unit to keep it horizontal regardless of the ground where the vehicle is parked.

[0003]

SUMMARY OF THE INVENTION In the above known device,
Keep the tires of the four wheels on the front, rear, left, and right of the vehicle body in contact with the ground,
Since the outrigger hydraulic jacks on the lower wheels are extended to make the car body horizontal, when the car body is leveled, the wheels on the higher side are in contact with the ground, and the reaction force due to the elastic force of the spring not present on the car body It is unstable because it works. For this reason,
It is necessary to increase the size of the vehicle body to increase the weight and to stabilize the outriggers by extending the length of the outriggers to the outside, which sometimes makes it impossible to work on narrow roads.

A hydraulic circuit for expanding and contracting a jack branched from a common hydraulic pump is connected to four hydraulic jacks. The hydraulic jack with a small load and the hydraulic jack with a large load supply the hydraulic oil supplied. Since the amount changes depending on the magnitude of the load, it is very difficult to extend only the hydraulic jacks of the wheels on the lower side to level the vehicle body.

Further, after the vehicle body is made almost horizontal as described above, it is necessary to finely adjust the hydraulic jack with a small flow rate by using the flow rate control valve to re-level the vehicle body.

[0006]

In order to solve the above-mentioned problems of the prior art, the present invention uses the highest one hydraulic jack of the four hydraulic jacks as a reference when the vehicle is parked, and the remaining three hydraulic pressures. Actuate the jack to level the vehicle body with the wheels in contact with the ground as shown by the broken line in FIG. 2, then operate the four hydraulic jacks by the same amount to lift the vehicle body horizontally.
I tried to raise all the wheels to the ground,
In the method for leveling a vehicle body with outriggers having four outriggers having hydraulic jacks on the front, rear, left and right of the vehicle body, pressure is applied to the extension circuit connected to the extension side oil chamber of the extension hydraulic circuit of the hydraulic jack of each of the above outriggers. A flow control device with compensation is provided, and a wheel levitation sensor that detects that each wheel has levitated on the vehicle body, and two pairs of outriggers, a left front and a right rear, of a quadrangle whose corners are the four outriggers are connected. First to detect inclination in the first diagonal direction
Signals of a diagonal inclinometer, a second diagonal inclinometer that detects an inclination in a second diagonal direction connecting two pairs of front right and left rear outriggers, and signals of the first and second diagonal inclinometers. And an arithmetic control unit for receiving the signals, the vehicle is stopped, the four hydraulic jacks of the outriggers are extended, and the hydraulic jacks are grounded. Then, the four hydraulic jacks are output by the signals of the first and second diagonal inclinometers. Among them, the highest hydraulic jack and the other three hydraulic jacks are calculated and determined by the arithmetic control device, and the hydraulic circuits for expansion and contraction of these three hydraulic jacks are instructed to supply oil to the jacks. The supply of oil to these three hydraulic jacks is stopped when the first and second diagonal inclinometers become horizontal, and then the arithmetic and control unit commands the expansion and contraction circuits of all the hydraulic jacks. Flow into the extension side oil chamber of all hydraulic jacks As well as additional supply pressure oil in,
Based on the levitation signals from the wheel levitation sensors for all the wheels, additional replenishment of pressure oil was stopped, which extended all hydraulic jacks by the same amount and lifted the vehicle body to a standstill to bring all the wheels to the ground. It is characterized by raising it. Even if the flow control device with pressure compensation is an electromagnetic flow proportional / directional control valve with pressure compensation that also serves as an electromagnetic directional control valve of the expansion / contraction hydraulic circuit of each hydraulic jack, the expansion / contraction hydraulic circuit of each hydraulic jack is It may be either a flow control valve with pressure compensation provided in the extension circuit or an electromagnetic flow proportional control valve with pressure compensation.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 3, 10 is a vehicle body, 11L, 11R
Is the left and right front wheels, 12L, 12R is the left and right rear wheels, 13L,
Reference numeral 13R indicates left and right front outriggers, and 14L and 14R indicate left and right rear outriggers. Each outrigger is slidably fitted to the outer case 15 provided in the vehicle body in the vehicle width direction, and is always fitted to the outer case 15. Is housed in the outer case and includes an inner case 16 that extends outside the vehicle body by the extension of the piston of the outrigger extension cylinder 17, and a hydraulically operated piston-cylinder-type hydraulic jack 18 is provided at the outer end of each inner case. It is provided downward.
Between the outer case 15 and the inner case 16, as described in the conventional device, an outrigger extension sensor for detecting that the inner case is extended from the vehicle body, and a hydraulic jack 18 extend downward. However, there is provided a jack grounding sensor (not shown) for detecting that the jack is grounded by pushing up the inner case when the stone tip at the lower end of the piston is grounded.

Further, when the vehicle body is lifted by the hydraulic jack to float the wheels on the ground, the left and right rear wheels 12
In order to prevent the spring 19 without the L and 12R tires from bending downward in a bow shape to prevent it from hanging down, as shown in FIG. 4, a hook 21 that is operated by a spring lock cylinder 20 is provided on the vehicle body to Cylinder 2 before lifting
It is preferable to extend the piston of No. 0 and hook the hook 21 on the metal fitting 22 provided at the center of the spring 19 not present, and integrate the spring not present with the vehicle body 10 to prevent the rear wheel from hanging. It should be noted that one end of the rope is connected to the center of the spring 19 not present in place of the hook 21, and the spring lock cylinder 20 pulls the other end of the rope to pull up the spring not provided for each rear wheel, and the spring 19 not provided is provided on the vehicle body. It may be integrated with 10. In addition, a wheel levitation sensor 23 is provided on the vehicle body for detecting the downward displacement of the spring 19 which does not bend slightly downward due to the weight of the wheel when the vehicle body is lifted and levitated with respect to all the wheels. ..

The pressure oil from the hydraulic pump 24 is used as a common hydraulic circuit 2 for expanding and contracting the four outrigger extension cylinders 17.
5, the common hydraulic circuit 26 for expansion and contraction of the spring lock cylinders 20 of the two rear wheels, and the four hydraulic jacks 18 are branched and supplied to the four individual expansion and contraction hydraulic circuits 27 that operate individually, and returned to the reservoir. (Figs. 5 and 6)
reference).

A hydraulic circuit 27 for expanding and contracting the above-mentioned hydraulic jacks.
The expansion circuit 28 connected to the expansion-side oil chamber 18a is provided with a flow rate control device 29 with pressure compensation, and the pressure oil from the hydraulic pump is branched and supplied to extend the jacks. Regardless of the difference in load, the same amount of pressure oil is supplied to the extension side oil chambers of the four hydraulic jacks so that each jack can extend downward to the same amount.

Since there is a limit to the length of the piston that extends downward from the four hydraulic jacks for leveling the vehicle body 10, the vehicle body 10 detects inclination in the vehicle width direction as shown in FIG. A vehicle width inclinometer 30 and a vehicle length inclinometer 31 for detecting an inclination in the vehicle length direction are provided, and when the vehicle is parked, signals from the vehicle width inclinometer 30 and the vehicle length inclinometer 31 are used to perform an arithmetic control device described later. Calculate the inclination angle of the car body with, and can the car body's tilt angle be made horizontal by lifting all wheels to the ground with four hydraulic jacks of front and rear, left and right outriggers,
Whether or not it is possible is judged, and when it is possible, the operation for leveling the vehicle body in the parked state is performed. When not possible, the vehicle is moved to a place where it can be leveled, parked, and then leveled. In addition, the above-mentioned judgment is performed by the vehicle width inclinometer 30 and the vehicle length inclinometer 3
1, it is also possible to calculate the signals emitted by the first diagonal inclinometer and the second diagonal inclinometer, which will be described later, by the arithmetic and control unit. In this case, the vehicle width inclinometer and the vehicle length inclinometer are used. The total may be omitted.

In addition to the inclinometer, as shown in FIG. 3, the four outriggers 13L, 13R and 14L are provided on the vehicle body.
First diagonal inclination that detects the inclination in the first diagonal direction connecting two pairs of left front and right rear outriggers 13L and 14R of the quadrilateral with the hydraulic jacks 18 of 14 and 14R as corners A total of 32, and two pairs of outriggers 13R and 14L for the front right and rear left hydraulic jacks 18, 18
A second diagonal inclinometer 33 for detecting the inclination in the second diagonal direction connecting the two, and signals from the vehicle width inclinometer 30 and the vehicle length inclinometer 31;
An arithmetic and control unit 34 for receiving signals from the first and second diagonal inclinometers 32 and 33 is also provided. First diagonal inclinometer 3
2 and the second diagonal inclinometer 33 are a pair of outriggers 13L.
It is preferable to detect the diagonal inclinations of the hydraulic jacks when the inner cases 16 of 14R and 13R and 14R project outward from the vehicle body 10.

When the vehicle is parked and its inclination angle is within the range in which the vehicle body can be leveled by the hydraulic jack as described above,
The electromagnetic directional control valve 25 'connected to the expansion / contraction common circuit 25 of the outrigger extension cylinder is operated from the neutral position to extend the inner case 16 of each outrigger to the outside of the vehicle body, and then connected to the individual expansion / contraction hydraulic circuit 27 of the hydraulic jack. All the electromagnetic directional control valves 27 'are operated from neutral to supply pressure oil to the extension side hydraulic pressure 18a of the hydraulic jacks 18 of the respective outriggers (broken line arrow in FIG. 1), and the hydraulic jacks are extended downward respectively. Ground the bottom of the jack. These controls are performed by the above-mentioned outrigger extension sensor and the jack grounding sensor. At this time, the electromagnetic directional control valve 2 of the expansion / contraction common hydraulic circuit 26 of the spring lock cylinder 20
6'is operated from the neutral position, and the piston is used to hook the hook 21 on the metal fitting 22 to integrate the spring 19 not present in the left and right rear wheels 12L, 12R with the vehicle body.

Then, according to the present invention, the arithmetic and control unit 34 receives signals from the first diagonal inclinometer 32 and the second diagonal inclinometer 33 to perform an arithmetic operation to determine the highest one of the four hydraulic jacks.
One hydraulic jack and the other three hydraulic jacks are discriminated, and the electromagnetic directional control valve 27 'of the expansion / contraction hydraulic circuit 27 of each of the three hydraulic jacks is actuated.
7 supplies pressure oil to the extension side oil chamber of each hydraulic jack to extend the three hydraulic jacks downward, and connects the hydraulic jacks of the two outriggers on the left front and right rear in the first diagonal direction. When the first diagonal inclinometer 32 for detecting the inclination detects horizontal, the supply of pressure oil to the front left and rear right hydraulic jacks is stopped, and the front right and rear left outrigger hydraulic jacks are connected. When the second diagonal inclinometer 33 detects horizontal, the supply of pressure oil to the hydraulic jacks on the front right and the rear left is stopped. As a result, the car body is horizontal until one of the wheels touches the ground regardless of the slope of the parked ground (Fig. 2, solid line).

Next, the arithmetic and control unit 34 issues a command to the electromagnetic directional control valves 27 'of the expansion and contraction circuits 27 of all the hydraulic jacks, and the expansion side oil chambers 18a of the respective hydraulic jacks are pressure-controlled by the flow rate control unit 29. Add oil. As described above, even if the load of each hydraulic jack is different, since the flow control device with pressure compensation 29 replenishes the expansion side oil chamber 18a of each hydraulic jack with the same amount of pressure oil, all hydraulic jacks are Extends downward by the same amount and gradually lifts the vehicle body. In the hydraulic circuit of FIG. 5, the flow rate control device 2 with pressure compensation is used.
Reference numeral 9 denotes an electromagnetic flow rate proportional and directional control valve 29 'with pressure compensation, which doubles as an electromagnetic directional control valve of each hydraulic jack, and directs the branched pressure oil flow from the hydraulic pump to the extension side oil chamber of each hydraulic jack. , A constant flow rate is supplied regardless of the load of each hydraulic jack. Further, in the hydraulic circuit of FIG. 6, the flow control device 29 with pressure compensation is a valve provided in each expansion circuit 28 upstream or downstream of each electromagnetic directional control valve 27 '. This valve may be the flow control valve with pressure compensation 29a or the electromagnetic flow proportional control valve with pressure compensation 29b, but if it is the electromagnetic flow proportional control valve with pressure compensation, the speed of each hydraulic jack can be controlled individually, so that the vehicle body is lifted. The speed is initially high, and thereafter, the speed is gradually decreased, and parallel lift to the target height can be performed faster than lifting at a constant speed. The above valve 2
9a and 29b may be attached to the electromagnetic directional control valve 27 'instead of being connected in the middle of the expansion circuit 28.

When the parallel lift is performed in this way and all the wheels have floated above the ground, the arithmetic and control unit 34 returns the directional control valve 27 'to the neutral position and stops the supply of the pressure oil to each hydraulic jack. The instruction to stop the supply of the pressure oil by the arithmetic and control unit 34 is issued based on the signals individually transmitted by the wheel levitation sensors 23 individually detecting the levitation of the wheels.
After the lift, if any of the jack ground sensors of the four hydraulic jacks detects that it is not in the grounded state,
Only the hydraulic jack is extended downward until the ground sensor detects the ground condition. If the vehicle body is not horizontal after the parallel lift, the above operation is repeated.

In this way, when the body is leveled and the work is completed, the four hydraulic jacks are contracted, all wheels are grounded, the lower ends of the hydraulic jacks are floated from the ground, and the inner case of each outrigger is stored in the outer case.

[0018]

As described above, according to the present invention, the parked vehicle body 10 is made horizontal until one of the wheels is in a tilted state and then lifted in parallel to raise the wheels above the ground. The reaction force of the spring which does not exist does not act on the vehicle body, and the entire weight of the vehicle is distributed and added to the hydraulic jacks of the four outriggers. Therefore, since the weight of the vehicle acts as a weight, the vehicle body can be stably maintained horizontally, the overhanging length of the outriggers can be shortened, and work on narrow roads becomes possible. In particular, when the rear wheel is integrated with the vehicle body by the spring lock cylinder 20, the rear wheel does not hang down, and the height of parallel lift can be reduced, which is more stable. Then, the wheels can be quickly and accurately lifted to level the vehicle body by only two operations of horizontal correction and subsequent parallel lift.

[0019] The applicant of the present application has proposed that, apart from the expansion and contraction cylinder of each hydraulic jack, pressure oil for parallel lift is forcibly pressed into the extension side oil chamber of each hydraulic jack to perform parallel lift. Proposed in a patent application dated 22nd of March. In this case, the height of parallel lift is stepwise, but in the present invention, since the height of parallel lift can be continuously controlled,
It is possible to levitate the wheel closest to the ground to the ground in the grounded state, the height of the car body is low and stable,
The time required from parking to leveling the car body will be shortened. Further, since the cylinder for parallel lift and the hydraulic equipment associated therewith are not required, the hydraulic circuit is simplified, and accordingly, the weight of the vehicle body is reduced and the cost is reduced.

[Brief description of drawings]

FIG. 1 is a schematic explanatory diagram of a main part of an apparatus for carrying out the present invention.

FIG. 2 is an explanatory view showing a state in which the vehicle body is leveled with the wheels in contact with the ground and then lifted in parallel.

FIG. 3 is a plan view of a vehicle body.

FIG. 4 is a front view of an example of a spring lock device and a wheel levitation sensor.

FIG. 5 is a hydraulic circuit according to the first embodiment of the present invention.

FIG. 6 is a hydraulic circuit diagram of a second embodiment of the present invention.

[Explanation of symbols]

 10 vehicle body 11 front wheel 12 rear wheel 13 front left and right outriggers 14 rear left and right outriggers 18 hydraulic jacks of each outrigger 23 wheel levitation sensor 24 hydraulic pump 27 individual expansion / contraction circuit of hydraulic jack 28 extension circuit 29 flow control device with pressure compensation 29 'Electromagnetic flow proportional and directional control valve with pressure compensation 29a Flow control valve with pressure compensation 29b Electromagnetic flow proportional control valve with pressure compensation 32 First diagonal inclinometer 33 Second diagonal inclinometer 34 Arithmetic control device

Claims (3)

[Claims] 1. A method for leveling a vehicle body with outriggers comprising four outriggers having hydraulic jacks on the front, rear, left and right sides of the vehicle body, wherein the hydraulic jacks for extension and contraction are connected to an extension side oil chamber. A flow control device with pressure compensation is provided in the extension circuit, a wheel levitation sensor that detects that each wheel has floated on the vehicle body, and two pairs of left front and right rear quadrilaterals with the four outriggers as corners. Diagonal inclinometer that detects the inclination in the first diagonal direction with the outriggers connected to each other, and a second diagonal angle that detects the inclination in the second diagonal direction that connects the two pairs of front right and left rear outriggers An inclinometer and an arithmetic and control unit for receiving signals from the first and second diagonal inclinometers are provided, the vehicle is stopped, and the four outrigger hydraulic jacks are extended to ground the respective hydraulic jacks. First , A second diagonal inclinometer signal is used to determine the highest hydraulic jack of the four hydraulic jacks and the other three hydraulic jacks by computing them with a computing control device, and the expansion and contraction of these three hydraulic jacks. To supply the oil to the jacks to the hydraulic circuits for use, and to stop the oil supply to the three hydraulic jacks when the first and second diagonal inclinometers become horizontal, The arithmetic and control unit commands the expansion and contraction circuits of all the hydraulic jacks to supply additional pressure oil to the expansion side oil chambers of all the hydraulic jacks at the same flow rate, and based on the levitation signals from the wheel levitation sensors for all wheels. Stop the additional supply of hydraulic oil,
As a result, all the hydraulic jacks are extended by the same amount, and the vehicle body is lifted until it is stopped so that all the wheels float above the ground. 2. The body leveling method for a vehicle with an outrigger according to claim 1, wherein the flow control device with pressure compensation is a solenoid with pressure compensation that also functions as an electromagnetic directional control valve of a hydraulic circuit for expansion and contraction of each hydraulic jack. A body leveling method for a vehicle with an outrigger, which is a flow rate proportional and directional control valve. 3. The body leveling method for a vehicle with an outrigger according to claim 1, wherein the flow control device with pressure compensation is provided with a flow amount with pressure compensation provided in an extension circuit of an extension hydraulic circuit of each hydraulic jack. A body leveling method for a vehicle with an outrigger, which is either a control valve or an electromagnetic flow proportional control valve with pressure compensation.