JP2002219990A - Carrying automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a carrying automobile equipped with a deck capable of rising up and falling down, which is precluded from tumbling aside at the time of unloading on the ground inclining in the direction across the vehicle width. SOLUTION: The carrying automobile is equipped with the deck having a bottom 2a in semi-cylindrical shape, a front wall 2c and tail door, supported in the rear part of the body frame 1 swingably across the vehicle width, and taking a back tilting attitude when an upward directed force acts on the front wall upper part in its central part. Each side wall 2b is consolidated with the deck bottom 2a, and between the side wall 2b and front wall 2c, an actuator is installed for controlling their angles. Another actuator 24 to control the attitude in the width direction of the deck rear part is installed between the left and right sides of the rear of the body frame 1 and the deck bottom 2a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transport vehicle having a loading platform mounted on a vehicle body frame so as to be able to undulate.

[0002]

2. Description of the Related Art A transport vehicle itself loaded with an undulating carrier (vessel) is widely known. The unloading of this transport vehicle is performed by raising the front part of the driver's seat side, but the unloading place is often not a horizontal plane, so it has to be unloaded on the ground inclined in the width direction of the car Sometimes. In this case, especially when the bed is long and heavy earth and sand are loaded, deformation of the body frame and distortion of the spring between the body frame and the axle are added when the bed is raised, and the center of gravity of the bed is inclined below the ground. Outside of the vehicle body width (stable width), and the car may roll over. In order to prevent this rollover, it may be supported by a shovel car or the like from the side. There is also a concept that an outrigger for securing the horizontal posture of the vehicle body frame and widening the stable width is provided so as to protrude outward in the width direction of the vehicle body frame.

[0003]

It is not possible to support a bed from the side with a shovel or the like when raising the bed at a narrow construction site. In addition, the outrigger can freely change the length of a column supporting the vehicle body frame by a hydraulic cylinder, and it is easy to secure the horizontal posture of the transport vehicle. However, during use, there is an inability to move the transport vehicle. In particular, when unloading earth and sand, a certain amount of unloading must be performed and the car must be moved forward to secure a new unloading place, so that the outrigger becomes an obstacle. Moreover, it is troublesome to loosen the outrigger every time the vehicle is moved forward, and if the vehicle rolls over due to that, it is not possible or practical.

SUMMARY OF THE INVENTION It is an object of the present invention to prevent the transport vehicle from rolling over when the vehicle is unloaded on the ground inclined in the vehicle width direction in the transport vehicle on which the luggable carrier is loaded.

[0005]

A transport vehicle according to the present invention has a semi-cylindrical bottom portion 2a, a front wall 2c and a tail door 3, and is supported by a rear portion of the vehicle body frame 1 so as to be swingable in the vehicle width direction. And a loading platform 2 which takes a rearwardly inclined posture when an upward force acts on the upper center of the front wall.

It is preferable to integrate the side wall 2b with the bed bottom 2a and provide an actuator 12 between the side wall 2b and the front wall 2c for controlling both angles (FIG. 1 (1)).

The left and right sides of the rear part of the body frame 1 and the bottom 2a of the carrier
It is preferable to provide an actuator 24 for controlling the attitude of the rear portion of the loading platform in the width direction (FIG. 2 (1), FIG. 4).

The left and right actuators 24a, 24b
Are hydraulic cylinders, each hydraulic cylinder 24a, 24
means 27 for comparing and sensing the oil pressure in the lower part of b, the lower part of the hydraulic cylinder whose oil pressure is judged to be higher by the oil pressure comparing means 27 and the hydraulic cylinder which is judged to be lower in oil pressure Means 28 for switching the oil passages 33 and 34 so as to supply oil to the upper part of the oil passage (FIGS. 9 and 10).

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a transport vehicle according to the present invention will be described with reference to FIGS.

[0010] In this transport vehicle, a loading platform 2 whose front portion on the driver's seat side is lifted to take a rearwardly inclined posture when unloading is loaded on a vehicle body frame (frame) 1.

As shown in FIG. 1A, the loading platform 2 is rectangular when viewed from above in a horizontal state. As shown in the cross-sectional view of FIG. 6A, the bottom 2a of the loading platform 2 has a semi-cylindrical shape, and vertical side walls 2b are integrated on both sides thereof. The side wall 2b is made of, for example, a 5 mm high-tensile stainless steel plate. As shown in FIGS. 1 and 3, a front wall 2 c made of iron is obliquely provided at the front end of the bed 2 (when the front part of the bed 2 is lifted, a rod 8 a of an actuator 8 described later does not interfere with the front wall 2 c). 2) and 2) in the upper part of the rear end.
As shown in (1) and FIG. 5 (2), an iron tailgate 3 is provided to be openable and closable. Any well-known mounting structure may be employed, and description thereof will be omitted.

As described above, since the carrier bottom 2a is semi-cylindrical, it can be easily twisted by applying a stress in the circumferential direction. It is similar to the fact that a semi-cylindrical gutter can be easily twisted without changing the cross-sectional shape at both ends. This is important for the movement of the center of gravity of the platform into the stable range when unloading on the ground inclined in the vehicle width direction.

As shown in FIG. 3, the front wall 2c is fixed to the brim-like bent ends of the cargo bed bottom 2a and the side wall 2b by bolts and nuts (bolt holes are indicated by reference numeral 4). As shown in (2), it is at a position higher than the upper end of the side wall 2c. When fixing the front wall 2c, the bottom 2
The metal round bar 5 is fixed to the center part and the both side wall parts 2b by welding or the like, and the metal round bar 5 is surrounded by a frame-shaped grooved plate 6 fixed to the front wall 2c. . By adopting this fixing method, the torsional deformation of the bed bottom 2a can be performed without any trouble.

An inverted V-shaped iron reinforcing plate 7 is fixed to the front wall 2c. The top of the reinforcing plate 7 is an operation position where a rod 8a of the actuator 8 described later is attached. The higher the action position, the greater the amount of torsional deformation of the bed bottom 2a during rod extension.

As shown in FIG. 3, a front bracket 9 for receiving the bed bottom 2a is fixed to the front end of the vehicle body frame 1. At the center of the front bracket 9, a base of an actuator 8, such as a hydraulic cylinder or an electric actuator, is mounted so as to freely rotate in any direction. The rod 8a of the actuator 8 is attached to the top of the reinforcing plate 7 so as to freely rotate in any direction.

As shown in FIG. 3, receiving members 11 for securing the stability of the loading platform 2 while the vehicle is running are fixed to the loading platform bottom 2a corresponding to the upper ends on both sides of the front bracket 9, respectively. As shown in FIGS. 3 and 6 (2), latches 12 are provided on both sides of the front bracket 9 so as to engage with the receiving members 11 so that the carrier 2 does not come off from the front bracket 9 during traveling. You can also.

As shown in FIGS. 1 (1), 7 and 8,
An actuator 12 such as a hydraulic cylinder or an electric actuator is provided between the front wall 2c and the front part of the side wall 2b. This not only promotes torsional deformation of the bottom of the carrier when unloading on the ground inclined in the width direction of the vehicle, but also has a function of suppressing unnecessary distortion of the carrier.

The body frame 1 is, as shown in FIG.
The vehicle is supported by an axle 15 via a spring 3 and a spring 14 (the reference numeral 16 denotes a tire), and a rear bracket 17 is fixed to a rear end of the vehicle body frame 1. A carrier rocking shaft 18 is fixed to the center of the rear bracket 17. A center portion of a swinging rod 19 is swingably attached to the bed swinging shaft 18. The left and right ends of the swinging rod 19 project upward, respectively, forming horizontal support portions 19a through which the hinge shaft 10 is inserted. Similarly, the central portion also projects upward, and the hinge shaft 10
Is an intermediate support portion 19b through which is inserted. FIG.
The reference numeral 20 denotes a vehicle body auxiliary frame (subframe) fixed on the vehicle body frame 1 in the longitudinal direction.

On the other hand, hinge bearings 21, 21, 2 having holes through which the hinge shaft 10 can be inserted are formed on the left and right sides and the center of the rear end of the loading platform bottom 2a.
2 are fixed respectively. And hinge shaft 1
0 is a horizontal support 19a and an intermediate support 19b of the swinging rod 19;
Are inserted through the respective holes of the hinge bearings 21 and 22 of the carrier bottom 2a. As a result, the carrier 2 is attached to the rear part of the vehicle body frame 1 so as to be able to undulate around the hinge shaft 10.

By providing the carrier rocking shaft 18,
As shown in FIG. 5A, the loading platform 2 includes a hinge shaft 10
Together with the swinging rod 19 and the swinging rod 19, the swinging can be performed in the width direction of the vehicle body with respect to the vehicle body frame 1. In addition, the hinge shaft 10
As shown in FIG. 2 (2), the front portion of the carrier 2 can be raised and lowered about the hinge shaft 10 by the actuator 8 mounted on the front portion of the vehicle body frame 1 as shown in FIG.

The lower the position of the bed rocking shaft 18 is, the less the center of gravity moves due to the backward inclination of the bed 2.
In other words, the lower the carrier rocking shaft 18 is, the closer the center of gravity of the carrier 2 is to the center of the stable width. And, as the position of the center of gravity of the carrier 2 is closer to the center of the stable width, the distortion of the spring 14 and the deformation of the vehicle body frame 1 are reduced, and thereby the change of the center of gravity is promoted by the backward inclination posture of the carrier 2. Can be prevented. Therefore, it is preferable that the bed rocking shaft 18 is located at a position as low as possible.

At an intermediate portion in the longitudinal direction of the vehicle body frame, one or a plurality of intermediate brackets, indicated by reference numeral 23 in FIG.

As described above, when the rod 8a of the actuator 8 is extended, as shown in FIGS.
When the transport vehicle is on the ground inclined in the vehicle width direction, the rod 8a
As a result, the bed bottom 2a is naturally twisted and deformed around the rear part. FIG. 7 (1) shows a state in which the transport vehicle is on a downward slope as in FIG.
(2) shows a state when the transport vehicle is on a slope descending left. It can be seen that the bed 2 is twisted so that the center of gravity of the bed 2 moves within the vehicle width. The reason for the twist is as follows.

Usually, the weight of the load in the width direction of the bed is balanced. The load carrier 2 in which the load is balanced is twisted and deformed to take a horizontal posture when it is separated from the front bracket 9 and the intermediate bracket 23 with the extension of the rod 8a. The distortion extends to the rear end of the carrier 2, and the carrier 2 rotates around the carrier rocking shaft 18. On the other hand, the body frame 1
Is tilted along the inclined ground, so that the rod 8a is tilted to the upper side of the inclined ground. When the rod 8a is further extended in this state, the semi-cylindrical bottom 2a is twisted, and the carrier bottom 2a is further moved into the vehicle body width, and the posture is stabilized. The above is the reason why the torsional deformation naturally occurs on the bed bottom 2a. FIG. 7 (1) shows a state when the transport vehicle is on a downward slope, as in FIG. 8, and FIG. 7 (2) shows a state when the transport vehicle is on a downward slope. I have. It can be seen that the bed 2 is twisted so that the center of gravity of the bed 2 moves within the vehicle width.

It is more effective to adopt the following configuration in addition to the above configuration. That is, as shown in FIGS. 2A and 4, actuators 24 such as a hydraulic cylinder and an electric actuator are provided at both left and right end portions of the rear bracket 17 via actuator receivers 25, respectively. on the other hand,
The hinge shaft 10 has an actuator 24 (in FIG. 4, the left and right actuators are respectively 24a and 24a).
(shown by b) is provided with a plate 26 to which an actuator rod receiver 27 to which the rod end is attached is fixed. By adopting this configuration, by extending the rod of one of the left and right actuators (24a or 24b), the posture of the bed 2 in the width direction can be corrected to a horizontal state. In this state, since the rod 8a of the actuator 8 is already inclined toward the upper side of the inclined ground, the load 2 is twisted by the extension of the rod 8a, and the center of gravity of the load 2 moves within the vehicle width. Therefore, the transport vehicle does not roll over. The operation of the actuator 24 may be performed manually or automatically by a tilt sensor such as a gyro. Further, it can be automatically operated by the control device shown in FIGS. Next, a control device for the actuators 24a and 24b will be described. In this control device, the actuator is a hydraulic cylinder.

This control device comprises a balance cylinder 2
7, the main components of the control valve 28 and the pilot check valve 29.

The balance cylinder 27 senses the difference between the pressure of the lower part of the hydraulic cylinder 24a on the right side of the bed and the pressure of the lower part of the hydraulic cylinder 24b on the left side of the bed. A switch 3 is provided to selectively energize the electromagnets 28a and 28b.
This is for switching the 0 moving contact 27c. Inside the balance cylinder 27, there is provided a rod 27b to which a piston 27a is fixed at the center. A moving contact 27c is fixed to an end of the rod 27b protruding from the left end, and a return spring 27d for returning the piston 27a to the center of the balance cylinder 27 is provided at the right end. Also, the hydraulic cylinder 24a
An oil passage 31 is connected between a lower portion of the hydraulic cylinder 24b and a right portion of the balance cylinder 27, and the hydraulic cylinder 24b
An oil passage 32 is connected between the lower part of the balance cylinder 27 and the left part of the balance cylinder 27.

The control valve 28 controls the upper portion of the hydraulic cylinder 24a and the hydraulic cylinder 24b to change the degree of extension of the rods of the hydraulic cylinders 24a and 24b when the transport vehicle is on the ground inclined in the width direction of the carrier.
The oil supply path is switched between an oil path 33 piped between the lower part of the hydraulic cylinder 24a and an oil path 34 piped between a lower part of the hydraulic cylinder 24a and an upper part of the hydraulic cylinder 24b. At the right and left ends of the control valve 28, electromagnets 28 for switching oil paths are provided.
a and 28b are provided between the electromagnet 28a and the terminal on the right side of the switch 30;
The electric wires 35 and 36 are connected between the terminals on the left side of. The control valve 28 has a hydraulic pump P for supplying oil to the oil passage 33 or 34.
And a tank T for storing the oil returned from the oil passage 34 or the oil passage 33.

The pilot check valve 29 is connected to the oil passage 3 connected between the control valve 28 and the oil passage 33.
7, and a backflow prevention valve which is arranged in an oil passage 38 connected between the control valve 28 and the oil passage 34 and opens only when the hydraulic pressure on the control valve side is high. Therefore, when the pressure in the oil passage 33 or the oil passage 34 does not increase due to malfunction of the control valve 28, breakage (cutting) of the oil passage, or failure of the hydraulic pump, the cylinder in which the rod must be extended contracts and is conveyed. Prevent the car from falling.

Employing the above control device, for example,
As shown in FIG. 9, when the bed 2 is inclined downward to the right and the center of gravity is shifted to the right, the pressure in the lower part of the right hydraulic cylinder 24 a becomes higher than the pressure in the lower part of the left hydraulic cylinder 24 b. As a result, the balance cylinder 2
The hydraulic pressure in the right side of 7 is increased, the piston 27a moves to the left, and the contact piece 27c contacts the left terminal of the switch 30. Then, the electromagnet 28b is energized, the hydraulic pump P communicates with the oil passage 34, and oil is sent to the lower part of the hydraulic cylinder 24a and the upper part of the hydraulic cylinder 24b. As a result, the rod of the right hydraulic cylinder 24a extends upward, and the rod of the left hydraulic cylinder 24b lowers. This operation continues until the difference in oil pressure between the right and left portions of the balance cylinder 27 is balanced with the force of the return spring 27d, and the carrier 2 returns to the horizontal position and the center of gravity returns to the center. At that time, the hydraulic cylinder 24a
Is returned to the tank T through the oil passage 33 (the pilot check valve 29 provided in the oil passage 37 is invalidated). The control of the posture of the bed 2 by this control device is effective up to an inclination angle of the ground of 10 °. If the inclination angle of the ground is equal to or larger than a predetermined angle, the posture of the bed 2 due to natural torsional deformation. Control works effectively. Also,
If the bed 2 leans to the left and the center of gravity is shifted to the left,
As shown in FIG. 10, the piston 27a moves to the right,
According to the above operation, the rod of the right hydraulic cylinder 24a is lowered, the rod of the left hydraulic cylinder 24b is extended upward, the carrier 2 returns to the horizontal position, and the center of gravity returns to the center.

Although this control device can be used alone, it can be mutually backed up by using an automatic control device for the actuators 24a and 24b using a gyro-type or pendulum-type tilt sensor, etc. And the other covers).

The actuators 24a and 24b are mainly used in the initial stage of extension of the rod 8a when the load on the carrier 2 is heavy and the amount of rotation about the platform swing axis is not sufficient.
Is effective in helping the person take a horizontal position.
As a result of the provision of such actuators 24a and 24b, natural torsional deformation in the initial stage centered on the rear portion of the carrier due to the upward rotation of the carrier 2 is alleviated. Is improved. In addition, even after the auxiliary posture control in the initial stage by the actuators 24a and 24b, the natural torsional deformation of the carrier 2 still acts. When the load is light, the actuators 24a and 24b do not need to be operated, and in this case, energy can be saved.

[0033]

As described above, the transport vehicle of the present invention tilts in the width direction of the vehicle at a narrow construction site or the like because the attitude control of the platform on the slope is naturally performed as the platform is turned upright. Unloading on the ground, without overturning the car,
You can do it safely. In addition, the vehicle that is being unloaded can move forward freely. Also,
Since the platform attitude control basically does not require power,
It is economical.

In the case where an actuator for controlling both angles is provided between the side wall and the front wall of the carrier, torsional deformation of the carrier bottom when unloading on the ground inclined in the vehicle width direction is promoted. In this way, unnecessarily distortion of the carrier is suppressed.

When the widthwise posture of the rear portion of the carrier is controlled by actuators provided between the left and right sides of the rear portion of the vehicle body frame and the bottom portion of the carrier, the rotation of the carrier when the load is heavy is promoted. Can be assured. Also, as a result, the natural torsional deformation of the carrier at the initial stage of the standing rotation is reduced, so that the durability of the carrier is improved.
When the load is light, the actuator does not need to be operated, which contributes to energy saving.

[Brief description of the drawings]

FIG. 1 is a view of a transport vehicle of the present invention (the same applies to any of the following figures), (1) is a plan view, and (2) is a side view.

FIG. 2A is a side view for explaining a relationship between a rear portion of a carrier and a vehicle body frame, and FIG. 2B is a side view of the transport vehicle when the carrier is in a rearwardly inclined posture.

FIG. 3 is a front view of the transport vehicle.

FIG. 4 is a rear view of the transport vehicle with a tail door removed.

FIG. 5 is a rear view of the transport vehicle, (1) showing that the rear portion of the carrier can swing in the vehicle width direction, and (2) showing a state where a tail door is attached.

FIG. 6 is a cross-sectional view of a middle portion of the loading platform,
(2) is a side view of the front part of the loading platform.

FIG. 7 is a plan view of a transport vehicle in which a carrier is tilted backward on the ground inclined in the width direction of the vehicle, wherein (1) is on the ground inclined downward to the right, and (2) is lowered downward. It is when it is on the ground that is inclined.

FIG. 8 is a perspective view seen from the rear side of the transport vehicle in which the loading platform is tilted backward on the ground inclined downward to the right in the vehicle width direction.

FIG. 9 is a control circuit diagram of a carrier attitude control auxiliary cylinder when the carrier is inclined to the lower right.

FIG. 10 is a control circuit diagram of a carrier attitude control auxiliary cylinder when the carrier is inclined to the lower left.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body frame 2 Carrier 2a Bottom part 2b Side wall part 2c Front wall 3 Tail door 12 Actuator 24 Actuator 24a Right hydraulic cylinder 24b Left hydraulic cylinder 27 Balance cylinder as oil pressure comparison means 28 Control valve as oil passage switching means 33 Oil passage 34 Oil passage

Claims (4)

[Claims] 1. A vehicle having a semi-cylindrical bottom, a front wall, and a tail door, supported at the rear of the vehicle body frame so as to be swingable in the vehicle width direction, and when an upward force acts on the upper center of the front wall. A transport vehicle with a carrier that leans backward. 2. The transport vehicle according to claim 1, wherein a side wall is integrated with the bottom of the carrier, and an actuator for controlling both angles is provided between the side wall and the front wall. 3. The transport vehicle according to claim 1, wherein actuators are provided between the bottom of the carrier and the left and right sides of the rear portion of the vehicle body frame, the actuators controlling the widthwise posture of the rear of the carrier. 4. An actuator on both the left and right sides is a hydraulic cylinder, means for comparing and sensing the hydraulic pressure in the lower part of each hydraulic cylinder, and the lower part of the hydraulic cylinder which is judged to be large by the hydraulic pressure comparing means. 4. The transportation vehicle according to claim 3, further comprising means for switching an oil passage so as to supply oil to a portion and an upper portion of the hydraulic cylinder determined to have a small oil pressure.