JPH07276938A - Traction vehicle - Google Patents

Abstract

PURPOSE:To enlarge a steering angle during traction by providing driven wheels at both end parts of a traction frame provided with an elevating connecting means for a body having steerable driving wheels, and forming a vehicle receiving part lower than the underfloor height of a truck, and a joint part, narrower in width than the vehicle receiving part and having recessed parts at the side parts, at the rear end of the vehicle receiving part. CONSTITUTION:A traction vehicle is provided with a wheel receiving part 11 with a pair of driven wheels 4A, 4B pivotally supported to the end part of a traction frame 10, and a joint part 12 for jointing the wheel receiving part 11 to a body base part 3. The driven wheels 4A, 4B are small in diameter and journalled in the state of being kept within the height of the wheel receiving part 11 from the ground so as to keep a body stable by three items together with a driving means 2. The height of the wheel receiving part 11 is made lower than the underfloor height of a towed truck so that the wheel receiving part 11 can freely enter the underfloor gap of the towed truck at the time of steering during traction. The wheel receiving part 11 and the body base part 3 are jointed by the joint part 12 of narrower width W2 than the width W1 of the wheel receiving part 11 so as to form recessed parts 13 on the lateral side parts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a towing vehicle capable of towing a towed vehicle and reducing a turning radius during towing.

[0002]

2. Description of the Related Art Conventionally, a heavy load of about 5 to 10 tons is carried by using an overhead crane or a large forklift, and a heavy load is carried on a platform of a platform truck. ing.

However, when such a platform truck is used, the strength of the platform truck must be improved according to the load to be loaded, the vehicle body size of the platform truck becomes large, and the cargo handling motor for raising the platform and the self-propelled vehicle are used. For this purpose, a traveling motor or the like having a large output must be used, which is costly and not preferable.

On the other hand, in recent years, heavy goods are often stored in a state in which they are placed on a tow truck that can be towed. In such a case, the platform truck is partially modified to store the tow truck. At present, heavy goods are transported by towing.

For example, as shown in FIGS. 4 and 5, the platform truck a is provided with a battery case d and a platform e which can move up and down with respect to a base frame b on which drive wheels c are arranged, and an end portion of the platform e. Fixed wheels f, f that are grounded on the road surface, and a turntable g that is rotatable around a vertical axis are provided in the vehicle.

However, the platform e of the platform truck a is made to enter between the wheels h, h of the towed vehicle k loaded with a heavy object (not shown) and into the gap between the towed vehicle W and the road surface. By raising the platform e, one end of the towed vehicle k can be placed on the ten table g.

Platform truck a and tow truck W
By changing the steering angle θ1 which is the angle between the vehicle body centerlines around the rotation center point CL of the turntable g, it is possible to steer and turn on a curved road.

[0008]

The above-mentioned prior art is excellent in that it is possible to use a small size and small output for the platform track a because it does not have to bear the total weight of heavy objects. When the steering angle θ1 formed by the platform truck a and the towing truck W is changed, the platform e comes into contact with the wheel h of the towed truck k as shown by the alternate long and short dash line in FIG. As a result, there is a problem that the vehicle cannot be towed on a curved road having a large turning radius and a narrow width.

The present invention has been devised in view of the above problems, and provides a towing vehicle capable of increasing the steering angle during towing, reducing the turning radius, and solving the above problems. Is intended.

[0010]

SUMMARY OF THE INVENTION According to the present invention, a vehicle body base having steerable drive wheels is provided with a pair of driven wheels and an ascending / descending engagement which can be engaged with a coupled member of a towed vehicle to be towed. A tow vehicle having a tow frame provided with a connecting tool having a piece, wherein the tow frame is provided with the driven wheels at both ends, and the tow frame is smaller than the underfloor height of the towed vehicle and is connected to the tow frame. Since the wheel receiving portion having the tool arranged at the rear end and the wheel receiving portion and the vehicle body base portion are connected to each other and have a width narrower than the wheel receiving portion, the wheel receiving portion and the vehicle body base portion are provided. The towing vehicle is characterized in that a recess is formed on the side of the joint portion.

[0011]

By forming a recess on the side of the joint between the wheel receiving portion and the vehicle body base, the wheels of the towed truck and the towing frame of the towing vehicle interfere early during turning. As a result, the turning angle can be increased and the turning radius can be reduced.

Further, by making the length of the towing frame smaller than the length of the vehicle body base portion, the vehicle body length can be reduced and the vehicle can be miniaturized. Further, the locking piece can lift and lift one end of the towed truck. This is preferable in that such a towed vehicle can be towed by lifting a leg portion where one end of the towed vehicle is fixed and the other end is a wheel.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The towed vehicle 1 of the present invention has a vehicle body base 3 having steerable drive wheels 2 and a towed frame 10 provided with a pair of driven wheels 4A and 4B and a connecting member 9 projecting therefrom. Shows an electric vehicle driven by a battery.

The vehicle body base 3 is provided with a drive wheel 2, an accommodating section 3A which houses an electric motor for rotating the drive wheel 2, a control device, etc. (neither shown), and a storage section 3A which is continuous with and internally of the accommodating section 3A. A battery case 3B for accommodating a battery therein, and a handle post 14 for steering the drive wheels 2 is arranged in the accommodating portion 3A. The handle post 14 is provided with an accelerator device 15 for rotating the drive wheels 2 and a switch 16 for actuating a connector 9 described later.

The tow frame 10 has symmetrical plate-shaped members 22, 22 bent into a predetermined shape, which are opposed to each other and appropriately reinforced by a joint material 11A and a stay 21, and has a pair of driven wheels 4A, 4B at their ends. The wheel receiving portion 11 rotatably and pivotally supports the wheel receiving portion 11 and the joint portion 12 connecting the wheel receiving portion 11 and the vehicle body base 3.

The driven wheels 4A, 4B are solid tires of small diameter and made of urethane. As shown in FIG. 2, the driven wheels 4A, 4B are rotatably supported within the height h of the wheel receiving portion 11 from the ground, and are driven by the driving means 2. A total of three points keep the body stable. Therefore, the distance W3 between the outermost sides of the driven wheels 4A and 4B is
Is preferably 0.6 to 0.7 times the width W4 of the vehicle body base 3.

Further, the height h of the wheel receiving portion 11 is set to be smaller than the underfloor height H of the towed vehicle 5 as shown in FIG. 2, and the wheel receiving portion 11 is moved to the towed vehicle 5 during steering. It is configured so that it can freely enter into the underfloor clearance of.

Further, the wheel receiving portion 11 is provided with a connecting member 9 having a locking piece 7 which can be raised and lowered from its rear end. As shown in FIGS. 1 and 2, the locking piece 7 is rotatably supported at a substantially middle position of the length by a fixed pin 19, and the rod of the cylinder 17 is connected to the rear end side. By extending and contracting the rod of the cylinder 17, the locking piece 7 can be swung and the height position from the ground can be changed. Further, in the present embodiment, the locking piece 7 is formed with a hole portion 20 having a tapered portion whose diameter increases toward the upper surface of the locking piece 7. The rod of the cylinder 17 can be remotely expanded and contracted by the switch 16 provided on the handle post 14.

On the other hand, the towed truck 5 has a pair of fixed wheels 24 at one end and a pair of caster wheels 23 at the other end, and the connected tool 6 is a cylinder fixed to the outer surface of the towed vehicle 5 in this example. Body 6
From B, a protrusion 6A which is constantly urged downward by a spring, an air cylinder or the like, and which is smaller than the diameter of the hole 20 of the engaging piece 7 is provided.
By entering the inside of the hole portion 20, it is possible to steer and prevent disconnection due to vibration or the like during traveling. In this example, the cylinder 17 has a large output,
In addition, the caster wheel 23 is lifted from the road surface by raising a part of the towed vehicle 5 by increasing the swinging angle of the locking piece 7, so that the turning performance can be further enhanced.

Further, the wheel receiving portion 11 and the vehicle body base portion 3 are
By being spliced by the splicing portion 12 having a width W2 narrower than the width W1 of the wheel receiving portion 11, the recesses 13 are formed on the left and right sides of the splicing portion 12, respectively.

In this example, the joint portion 12 has an inclined edge whose height gradually rises from the wheel receiving portion 11, and the cylinder 17 is supported by the rising portion in a state in which the cylinder 17 is oriented vertically.

By forming the recess 13 on the side of the joint portion 12 in this manner, the towed vehicle 5 and the tow frame of the tow vehicle 1 are separated from each other during steering during towing, as shown in FIG. It is possible to prevent early interference and increase the steering angle θ2 to reduce the turning radius during towing.

As shown in FIG. 3, the length L1 of the towing frame 10 is made smaller than the length L2 of the vehicle body base 3 so that the towing vehicle 1 itself can be downsized. As a result, the space required for turning can be further reduced, and traction on a narrow bend can be achieved.

As described in detail above, the present invention is not limited to the above-mentioned embodiment, and one using an internal twisting engine as a prime mover,
In addition to forming the above-mentioned protrusion on the locking piece of the connecting tool and forming the hole on the side of the connected tool, it can be modified into various forms such as using a tow hook.

[0025]

As described above, the towing vehicle of the present invention is capable of widening the steering angle sandwiched between the center lines of the towed vehicle and the towed vehicle during towing, and having a small turning radius and a narrow bend road. Even in the case of towing.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a side view for explaining a connecting tool.

FIG. 3 is a plan view for explaining a steering angle during towing.

FIG. 4 is a side view for explaining a conventional technique.

FIG. 5 is a plan view for explaining a conventional technique.

[Explanation of symbols]

 2 Drive Wheels 3 Car Body Base 4 Driven Wheels 5 Towed Truck 6 Connected Tools 7 Locking Pieces 9 Connecting Tools 10 Traction Frame 11 Wheel Bearings 12 Joints 13 Recesses

Claims (3)

[Claims] 1. A vehicle body base having steerable drive wheels,
A tow vehicle having a protruding tow frame including a pair of driven wheels and a connecting tool having a vertically movable locking piece that can be locked to a connected tool of a towed vehicle to be towed. Is a wheel receiving portion provided with the driven wheels at both ends, and having a height smaller than the underfloor height of the towed vehicle and the connecting member arranged at the rear end, and connecting the wheel receiving portion and the vehicle body base to each other. A towed vehicle comprising a joint portion having a width narrower than that of the wheel receiving portion, so that a recess is formed between the wheel receiving portion and the vehicle body base on the side of the joint portion. 2. The towing vehicle according to claim 1, wherein the length of the towing frame is smaller than the length of the vehicle body base. 3. The towing vehicle according to claim 1, wherein the locking piece is capable of lifting and lifting one end of the towed vehicle by engaging with the connected tool.