JP4195787B2 - Car - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a transport vehicle in which a loading platform is loaded on a vehicle body frame so as to be able to undulate (reversely tilt).
[0002]
[Prior art]
2. Description of the Related Art A transport vehicle itself loaded with a undulating bed is widely known. The unloading of this transport vehicle is done by raising the front part of the loading platform on the driver's seat side, but the unloading location is often not a horizontal plane, and it must be unloaded on the ground inclined in the width direction of the vehicle. Sometimes not. In that case, especially when the loading platform is long and heavy earth or sand is loaded, the loading of the loading platform will cause deformation of the body frame and distortion of the spring between the body frame and the axle, so that the center of gravity of the loading platform will be May fall outside the vehicle body width (stable width) and roll over with the car. In order to prevent this rollover, the present applicant has already developed the transport vehicle shown in FIGS. 7 to 9 (Japanese Patent Application No. 2001-181063).
[0003]
The transport vehicle has a semi-cylindrical bottom, a front wall, and a tail door, and is supported at the rear part of the vehicle body frame 1 so as to be swingable in the vehicle body width direction, and when an upward force is applied to the upper center of the front wall. The platform 2 is provided with a loading platform 2 having a rearward tilting posture, and actuators 24a and 24b are provided between the left and right sides of the rear portion of the vehicle body frame 1 and the loading platform bottom to control the posture in the width direction of the rear loading platform.
[0004]
This transport vehicle is on the ground inclined in the width direction of the vehicle, and when the loading platform 2 takes a backward tilting posture, the loading platform 2 is as if the rod is twisted by the extension of the rod 4a of the actuator 4 for tilting the loading platform. The semi-cylindrical bottom portion 2 naturally twists and deforms, and the actuator 4 for tilting the back of the platform tilts toward the higher slope, and the center of gravity of the bottom of the platform moves within the vehicle body width starting from the rear. Therefore, unloading on the ground inclined in the width direction of the automobile such as a narrow construction site can be safely performed without the rollover of the automobile, and the automobile being unloaded can be freely advanced. Further, when the actuators 24a and 24b are operated at the initial stage of extension of the rod 4a when the load is heavy, the loading platform 2 can easily take a horizontal posture.
[0005]
[Problems to be solved by the invention]
However, in the above-described transport vehicle, when the loading platform 2 is tilted rearward on the ground inclined in the width direction of the vehicle and the actuators 24a and 24b are operated, the loading platform 2 sways little by little and stable posture control cannot be performed. In addition to discomforting surrounding workers, it also gives a sense of anxiety that the transport vehicle may roll over.
[0006]
The present invention has been made on the basis of such a technical background with the intention of solving the above-mentioned problems. On a ground where a transporting vehicle carrying a undulating bed is inclined in the vehicle width direction. The purpose of the unloading is to control the posture of the loading platform smoothly so that the transport vehicle does not roll over.
[0007]
[Means for Solving the Problems]
In the transport vehicle according to the present invention, a loading platform 2 with a tail door 3 is supported at the rear portion of the vehicle body frame 1 so as to be swingable and tiltable in the vehicle body width direction, and between the left and right sides of the rear portion of the vehicle body frame 1 and the bottom of the loading platform 2. each bed 2 attitude control actuator 24a, 24b are provided, the front bracket 7 is supported to be capable of swinging of the bed 2 widthwise to the vehicle body frame 1 the front, loading platform 2 after傾用actuator 4, the body base Alternatively, the rod 4a is provided at the center of the front bracket 7 in the vehicle body width direction so as to be rotatable in the front-rear direction of the vehicle body and stationary in the width direction, and between the left and right sides of the front bracket 7 and the vehicle body frame 1. loading platform attitude smoothly control actuator 8 and 9 are respectively provided, the front side of the loading platform 2 position before the loading platform 2 after傾用actuator 4 by rotating the bracket 7 by smoothly controlling actuator 8 and 9 It is obtained so as to swing in the vehicle body width direction relative to the vehicle body frame 1.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
With reference to FIG. 1 thru | or FIG. 6, embodiment of the transport vehicle of this invention is described.
[0009]
In this transport vehicle, a loading platform 2 in which the front portion on the driver's seat side is lifted to be tilted backward when unloading is loaded on a vehicle body frame (frame) 1. The platform posture smooth control actuators 8 and 9 provided on the vehicle body and the platform posture control actuators 24a and 24b provided on the rear portion of the vehicle body frame 1 are used to control the posture of the cargo bed 2.
[0010]
The loading platform 2 is rectangular when viewed from above in the horizontal state, and any cross-sectional shape may be used. As shown in FIG. 1, the front wall 2 a of the loading platform 2 is formed obliquely so that the rod 4 a of the loading platform rearward tilting actuator 4 described later does not interfere when the front portion of the loading platform 2 is lifted. Further, an iron tailgate 3 is provided at the upper rear end of the loading platform 2 so as to be openable and closable. Any known mounting structure may be employed.
[0011]
As shown in FIG. 2, a frame 5 extending in the vehicle body width direction is fixed to the upper part of the front end of the vehicle body frame 1. A loose U-shaped front bracket 7 is supported at the center of the frame 5 in the width direction of the loading platform so as to be swingable in the width direction of the loading platform via a shaft 6. Further, between the respective end portions of the frame 5 and the front bracket 7, actuators 8 and 9 for smooth loading platform posture control, such as hydraulic cylinders, are provided. That is, the actuators 8 and 9 are rotatably supported by the front bracket 7, and their rods are rotatably supported by the frame 5. Further, at the upper central portion of the front bracket 7 in the vehicle body width direction, the base portion of the loading platform rearward tilting actuator 4 made of a hydraulic cylinder, an electric actuator or the like is rotatable in the vehicle body front-rear direction and fixed in the vehicle body width direction. Installed. Further, the rod 4a of the actuator 4 is attached to the center of the upper part of the load carrier front wall 2a so as to be turnable in the longitudinal direction of the vehicle body. In contrast to the one shown in FIG. 2, the actuator 4 is mounted on the front bracket 7 so as to be pivotable in the longitudinal direction of the vehicle body and in a stationary state in the width direction of the vehicle body, and the base of the main body is mounted in front of the loading platform. You may attach to the wall 2a so that rotation of the vehicle body front-back direction is possible.
[0012]
With the use of such a configuration, when the front bracket 7 is inclined more than 2 degrees in the vehicle body width direction when the rod 4a of the platform tilting actuator 4 extends about 60 centimeters when unloading, Control is performed so that one of the platform posture smooth control actuators 8 and 9 is extended and the other is shortened by the same amount so that the inclination of the bracket 7 is within 1 degree. By actuating the actuators 8 and 9, the posture of the front bracket 7 is kept almost horizontal, and the turning force of the front bracket 7 with the shaft 6 as a fulcrum at that time is applied to the rod 4 a from the base of the actuator 4 for tilting the platform rearward. It is transmitted as a force that rotates the loading platform 2 in the width direction of the vehicle body. The platform posture smooth control actuators 8 and 9 are driven simultaneously with the platform posture control actuators 24a and 24b, which will be described later, provided at the rear part of the vehicle body frame.
[0013]
When the loading platform 2 is tilted backward on the ground inclined in the vehicle body width direction, the loading platform posture smooth control actuators 8 and 9 and the loading platform posture control actuators 24a and 24b are simultaneously driven, so that the loading platform 2 has a horizontal posture. Controlled, the center of gravity moves within the width of the vehicle body, and unloading on the ground inclined in the width direction of the car at a narrow construction site, etc. can be performed safely without overturning the car, and the car being unloaded You can move forward freely. Then, there is no wiggle of the loading platform 2 as in the case where the loading platform posture control actuators 24a and 24b are used to control the loading platform 2, and the stability of the posture control is improved. There is no discomfort or anxiety about overturning transport vehicles. In addition, after the rod 4a of the actuator 4 for tilting the loading platform is extended by about 60 cm, the loading platform attitude control actuators 8 and 9 and the loading platform attitude control actuators 24a and 24b are operated when the loading platform 2 is on the body frame. This is to prevent the burden on each actuator due to interference with the bracket.
[0014]
As shown in FIG. 3, the vehicle body frame 1 is supported by an axle 12 via a spring 11 (the reference numeral 13 indicates a tire), and a rear bracket 14 is provided at the rear end of the vehicle body frame 1. Is fixed. One intermediate bracket or a plurality of intermediate brackets for receiving the bottom of the cargo bed is also provided at the intermediate portion in the longitudinal direction of the vehicle body frame, but the illustration is omitted. A loading platform swinging shaft 15 is fixed to the center portion of the rear bracket 14. A swing bar 16 is attached to the platform swing shaft 15 so as to be swingable at the center. The left and right ends of the swing rod 16 project upward, respectively, to form horizontal support portions 16a through which the hinge shaft 17 is inserted. Similarly, the central portion also projects upward, and the hinge shaft 17 is inserted therethrough. It is an intermediate branch 16b. In FIG. 3, what is indicated by reference numeral 18 is a vehicle body auxiliary frame (subframe) fixed on the vehicle body frame 1 in the longitudinal direction.
[0015]
On the other hand, hinge bearings 19, 19, 20 having holes through which the hinge shaft 17 can be inserted are respectively fixed to the left and right side portions and the central portion at the rear end portion of the loading platform bottom. The hinge shaft 17 is inserted through the holes of the lateral support portion 16a and the intermediate support portion 16b of the swing rod 16 and the hinge bearings 19 and 20 at the bottom of the loading platform. As a result, the loading platform 2 is attached to the rear portion of the vehicle body frame 1 so as to be able to undulate around the hinge shaft 10.
[0016]
By providing the loading platform swinging shaft 15, the loading platform 2 can swing in the vehicle body width direction with respect to the vehicle body frame 1 together with the hinge shaft 17 and the swinging rod 16. Further, due to the presence of the hinge shaft 17, the front portion of the loading platform 2 can be raised and lowered around the hinge shaft 17 by the loading platform rearward tilting actuator 4 provided at the front portion of the vehicle body frame 1.
[0017]
Further, the lower the position of the loading platform swinging shaft 15, the less the movement of the center of gravity due to the backward tilting posture of the loading platform 2. In other words, the lower the position of the platform swinging shaft 15 is, the closer the center of gravity of the platform 2 is to the center of the stable width. Then, the closer the center of gravity of the loading platform 2 is to the center of the stable width, the less the distortion of the spring 11 and the deformation of the vehicle body frame 1, thereby promoting the change in the center of gravity by the backward tilting posture of the loading platform 2. Can be prevented. Therefore, it is preferable that the loading platform swinging shaft 15 be at a position as low as possible.
[0018]
At both left and right ends of the rear bracket 14, actuators 24a and 24b for loading platform posture control such as hydraulic cylinders and electric actuators are provided via actuator receivers 21, respectively. On the other hand, the hinge shaft 17 is provided with a plate 22 to which an actuator rod receiver 23 to which the rod ends of the platform posture control actuators 24a and 24b are attached is fixed (FIG. 4). By adopting this configuration, one of the loading platform attitude control actuators 24a and 24b is extended and the other is shortened by the same amount, so that the attitude of the loading platform 2 in the vehicle body width direction is corrected to a horizontal state. The operation of the platform attitude control actuators 24a and 24b may be performed manually or automatically by an inclination sensor such as a gyro (the platform attitude smooth control actuators 8 and 9 are also the platform attitude control actuators). This is the same because it is linked with 24a and 24b). Moreover, it can also be automatically operated by the control device shown in FIGS. Next, the control device for the platform attitude control actuators 24a and 24b will be described. In this control device, the platform posture control actuators 24a and 24b are hydraulic cylinders.
[0019]
This control device is composed of main members of a balance cylinder 27, a control valve 28 and a pilot check valve 29.
[0020]
The balance cylinder 27 senses the difference between the pressure in the lower portion of the hydraulic cylinder 24a on the right side of the loading platform and the pressure in the lower portion of the hydraulic cylinder 24b on the left side of the loading platform, and two electromagnets 28a provided on the control valve 28, The moving contact 27c of the switch 30 is switched so as to selectively energize 28b. Inside the balance cylinder 27, a rod 27b having a piston 27a fixed at the center is provided. A moving contact 27 c is fixed to the end of the rod 27 b protruding from the left end, and a return spring 27 d for returning the piston 27 a to the center of the balance cylinder 27 is provided at the right end. An oil passage 31 is connected between a lower portion of the hydraulic cylinder 24 a and the right portion of the balance cylinder 27, and an oil passage 32 is provided between the lower portion of the hydraulic cylinder 24 b and the left portion of the balance cylinder 27. Are connected.
[0021]
The control valve 28 is provided between an upper portion of the hydraulic cylinder 24a and a lower portion of the hydraulic cylinder 24b in order to change the extension degree of the rods of the hydraulic cylinders 24a and 24b when the transporting vehicle is on the ground inclined in the loading platform width direction. The oil supply path is switched between an oil path 33 piped between them and an oil path 34 piped between a lower part of the hydraulic cylinder 24a and an upper part of the hydraulic cylinder 24b. Electromagnets 28a and 28b for switching the oil path are provided at the right end and the left end of the control valve 28, respectively, and between the electromagnet 28a and the right terminal of the switch 30, and between the electromagnet 28b and the left terminal of the switch 30. Electric wires 35 and 36 are connected to each other. The control valve 28 is connected to a hydraulic pump P for supplying oil to the oil passage 33 or the oil passage 34 and a tank T for storing oil returned from the oil passage 34 or the oil passage 33. .
[0022]
The pilot check valve 29 is disposed on an oil passage 37 connected between the control valve 28 and the oil passage 33 and an oil passage 38 connected between the control valve 28 and the oil passage 34. This is a backflow prevention valve that opens only when the hydraulic pressure of the valve is high. Therefore, when the pressure in the oil passage 33 or 34 does not increase due to malfunction of the control valve 28, breakage (cutting) of the oil passage, failure of the hydraulic pump, etc., the cylinder to which the rod has to be stretched contracts and is transported. Prevent the car from falling.
[0023]
When the control device as described above is employed, for example, as shown in FIG. 5, when the loading platform 2 is tilted downward and the center of gravity is biased to the right side, the pressure in the lower portion of the right hydraulic cylinder 24a is changed to the left hydraulic cylinder. It becomes higher than the pressure of the lower part of 24b. As a result, the hydraulic pressure in the right side portion of the balance cylinder 27 increases, the piston 27a moves to the left side, 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 descends. This operation continues until the difference in hydraulic pressure between the right side portion and the left side portion of the balance cylinder 27 balances with the force of the return spring 27d, the loading platform 2 returns to the horizontal posture, and the center of gravity returns to the center. At that time, the oil in the upper part of the hydraulic cylinder 24a and the lower part of the hydraulic cylinder 24b is returned to the tank T through the oil passage 33 (the pilot check valve 29 provided in the oil passage 37 is invalidated). . Note that the attitude control of the loading platform 2 by this control device is effective up to an inclination angle of the ground of 10 °. Further, when the loading platform 2 is tilted downward to the left and the center of gravity is biased to the left side, as shown in FIG. 6, the piston 27a moves to the right side, and the rod of the right hydraulic cylinder 24a is lowered according to the above operation. The rod of the hydraulic cylinder 24b extends upward, the loading platform 2 returns to the horizontal posture, and the center of gravity returns to the center.
[0024]
This control device can be used alone, but it can also be used as a backup for each other by using an automatic control device for the actuators 24a and 24b by a tilt sensor such as a gyro type or a pendulum type. Cover).
[0025]
In addition, this invention is not limited only to embodiment, Other deformation | transformation aspects can be taken in the range which does not deviate from the essence.
[0026]
【The invention's effect】
As described above, the transport vehicle according to the present invention can safely unload on the ground inclined in the width direction of the vehicle such as a narrow construction site without overturning the vehicle. As well as being able to move forward freely, there is no swaying of the loading platform as in the case of controlling the loading platform in the vehicle width direction using only the loading platform attitude control actuator at the rear of the body frame, and attitude control In addition, the stability of the vehicle is improved, and there is no discomfort to surrounding workers or anxiety about overturning of a transport vehicle.
[Brief description of the drawings]
FIG. 1 is a side view of a transport vehicle according to the present invention.
FIG. 2 is a front view of the transport vehicle according to the present invention.
FIG. 3 is a rear view of the transport vehicle according to the present invention with a tail door removed.
FIG. 4 is a side view for explaining the relationship between the rear part of the loading platform and the body frame of the transport vehicle according to the present invention.
FIG. 5 is a control circuit diagram of the cylinder for controlling the loading platform posture of the transport vehicle according to the present invention when the loading platform tilts downward to the right.
FIG. 6 is a control circuit diagram of the cylinder for controlling the loading platform posture of the transport vehicle according to the present invention when the loading platform is tilted downward to the left.
FIG. 7 is a rear view of a conventional transport vehicle with a tail door removed.
FIG. 8 is a plan view of a conventional transport vehicle in which the loading platform is tilted backward on the ground inclined in the width direction of the automobile, (1) is when it is on the ground inclined downward to the right, (2) When on the ground sloping downward.
FIG. 9 is a view as seen from the rear side of a conventional transport vehicle in which the loading platform is tilted backward on the ground inclined downward in the vehicle width direction.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Body frame 2 Cargo bed 3 Tail door 4 Cargo back tilting actuator 6 Shaft 7 Front bracket 8 Cargo bed attitude smooth control actuator 9 Cargo attitude smooth control actuator 15 Cargo swing shaft 17 Hinge shaft 24a Cargo attitude control actuator 24b Cargo attitude control Actuator

Claims (1)

A load carrier with a tail door is supported at the rear of the vehicle body frame so that it can swing and tilt in the vehicle width direction, and an actuator for controlling the posture of the carrier is provided between the left and right sides of the rear of the vehicle body frame and the bottom of the load carrier, respectively. Is supported at the front of the vehicle body frame so as to be swingable in the width direction of the loading platform, and the actuator for tilting the loading platform is rotatable in the longitudinal direction of the vehicle body at the center of the vehicle body width direction of the front bracket at the main body base or rod, and The platform posture smooth control actuator is provided between the left and right sides of the front bracket and the vehicle body frame, and the bracket is rotated by the front platform posture smooth control actuator. A carrier vehicle that swings the loading platform rearward tilting actuator with respect to the vehicle body frame in the vehicle body width direction .

Images