JPH0930422A - Carrying truck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To turn a truck without receiving the influence of a difference between inner wheels. SOLUTION: In a carrying truck 14 formed by connecting plural trucks 11, each truck 11 is connected by a connecting and steering mechanism 8 for steering inner wheels of a truck 11 in the direction opposite to the steering direction of a front side truck 11, and at the time of turning, the front wheels 13 of the following truck 11 is steered in the direction opposite to the steering direction of the front side truck 11, and the truck 11 is turned without receiving the influence of a difference of inner wheels, and the work for separating the trucks 11 at the time of turning is eliminated, and a measure to cope with a contact of the truck with a corner part of a turning route is not required.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carrier vehicle having a plurality of carriages connected to each other, and is capable of turning on a narrow road without being affected by an inner ring difference of a succeeding carriage.

[0002]

2. Description of the Related Art When a part or the like is transferred in a factory, a transfer cart having a plurality of linked carts is used. An example of a trolley that constitutes the transport trolley will be described based on FIG. FIG.
Shows the whole state of the trolley. As shown in the figure, the body 2 of the carriage 1 is provided with left and right front wheels 3 and left and right rear wheels 4, and a transport carriage 6 is configured by connecting a plurality of main bodies 2. The left and right front wheels 3 are rotatably supported by the main body 2 via a central shaft 5, and the left and right rear wheels 4 are fixed to the main body 2. As shown in FIG. 5, a plurality of carriages 1 (four carriages in the illustrated example) are connected to the carriage 6, and a traveling carriage 7 is connected to the head of the carriage to transport parts and the like to a predetermined place in the factory.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention As shown in FIG.
When the conventional carrier truck 6 turns on the narrow road 8, the front wheel 3 of the truck 1 turns around the central axis 5 when the preceding truck 1 (traveling truck 7) turns, and the corner portion 9 changes due to the inner ring difference. Will come into contact with. For this reason, when the transport carriage 6 turns the narrow path 8, the transport carriage 6 is temporarily stopped before the corner portion 9 and then the carriage 1 is cut off, and each carriage 1 is transported by hand to the tip of the corner portion 9. It is connecting again. In the corner portion 9 having a relatively large margin, the influence at the time of contact is reduced by cutting the corner portion 9 in case of contact or by attaching a protection member to the corner portion 9. For this reason, a lot of work is required to turn the narrow path 8 by the conventional carrier truck 6, and a great deal of labor is required. In addition, various preparations are required in case of contact such as shaving the corner portion 9 or attaching a protection member.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a carrier truck which is less susceptible to the influence of the inner ring difference even when turning a narrow road.

[0005]

SUMMARY OF THE INVENTION To achieve the above object, the structure of the present invention is such that a plurality of carriages are connected to each other, and the left and right front wheels of each carriage are steerably supported. Each dolly is connected by a connecting and steering mechanism that steers the front wheels in a direction opposite to the steering direction of the dolly. Therefore, the front steering wheel is steered by the connecting steering mechanism in the direction opposite to the steering direction of the front bogie, and the front wheels are turned without being affected by the difference between the inner wheels.

The left and right front wheels of the bogie are connected by a connecting shaft, and the connecting steering mechanism has one end rotatably supported by the rear end of the front bogie and the other end pivoting by the connecting shaft. It is characterized in that it is a connecting rod which is freely supported and whose middle part is rotatably supported by a fulcrum of the carriage. Further, the connecting rod is biased in a neutral state with respect to a fulcrum of the carriage. Therefore, when the front bogie turns, the connecting rod turns around the fulcrum and the left and right front wheels are steered via the connecting shaft in the direction opposite to the turning direction of the front bogie. Further, since the connecting rod is biased in a neutral state with respect to the fulcrum of the bogie, it reliably moves while following the front bogie when traveling straight ahead.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic view showing a connecting portion of a carriage constituting a carrier truck according to an embodiment of the present invention, and FIG.
FIG. 3 shows the schematic configuration of the front part of the carriage, and FIG. 3 shows the traveling state of the carrier carriage.

As shown in FIGS. 1 and 2, a main body 12 of a carriage 11 is provided with left and right front wheels 13, and a plurality of main bodies 12 are connected to form a carriage 14. The left and right front wheels 13 are each supported by a bracket 16 which is rotatable with respect to the main body 12 via a central shaft 15, and the bracket 16 is connected by a connecting shaft 17. The rear portion of the front bogie 11 and the coupling shaft 17 are coupled by a coupling steering mechanism 18, and the coupling steering mechanism 18 steers the front wheels 13 in a direction opposite to the steering direction of the front truck 11. A rear wheel (not shown) is fixed to the main body 12 of the carriage 11.

The connection steering mechanism 18 will be described. One end of a connecting rod 19 is rotatably supported by a rear end portion of the front carriage 11 via a pin 20, and the other end of the connecting rod 19 is rotatably attached to a central portion of a connecting shaft 17 in a loosely fitted state. It is supported. An intermediate portion of the connecting rod 19 is rotatably supported by a fulcrum 21 of the carriage 11. When the front carriage 11 moves to the right, for example, the connecting rod 19 rotates around the fulcrum 21 to move the connecting shaft 17 to the left. The left and right front wheels 13 are steered to the left. The other end of the connecting rod 19 penetrates the connecting shaft 17,
A pair of springs 23 are provided in the penetrating portion 22 of the connecting rod 19. The pair of springs 23 causes the connecting rod 19 to move to the front wheel 13.
Is urged to maintain the neutral position. Connecting rod 1
The spring 23 for urging 9 to the neutral state has a spring force set based on the weight of the carriage 11 and the weight of the work to be mounted. Even if the bogie 11 on the front side moves to the right, for example, the spring force of 7 is not exerted, and the steering force to the left is not generated on the front wheels 13. The mechanism for urging the connecting rod 19 in a state in which the front wheel 13 holds the neutral position is that the connecting rod 19 is supported by the spring shaft at the fulcrum 21 in addition to urging the penetrating portion 22 by the spring 23. Is also possible.

The operation of the above-mentioned carrier vehicle 14 will be described with reference to FIG. As shown in FIG. 3A, the connecting rod 19 does not rotate about the fulcrum 21 and the penetrating portion 22 is biased by the pair of springs 23 while traveling on the straight road, and the front wheel 13 of the carriage 11 is urged. Remains neutral. As shown in FIG. 3B, when the front bogie 11 turns rightward, for example, the connecting rod 19 turns clockwise around the fulcrum 21 and the connecting shaft 17 moves leftward. By the movement of the connecting shaft 17, the left and right front wheels 13 are steered to the left via the bracket 16, and the carriage 11 moves to the left, which is opposite to the front carriage 11 (the locus shown by the dotted line in the figure). The actual movement path of the carriage 11 is not a large backward trajectory as shown by the dotted line in the figure, because the carriage 14 is moving forward,
It is a movement that traces the trail of the rear wheel. That is,
The carriage 11 is steered in the opposite direction to the extent that it does not move inward due to the difference in the inner wheels. This steering characteristic is obtained by setting the spring force of the spring 23 based on the weight of the mounted work. After that, the front wheel 1 is gradually increased by the spring force of the spring 23.
The steering wheel 3 is returned and the penetrating portion 22 of the connecting rod 19 is biased by the pair of springs 23, whereby the front wheel 13 is held in the neutral state. Therefore, when the front bogie 11 turns, a reverse steering force that traces the trail of the rear wheels is applied, so that the inner wheel difference does not cause the bogie 11 to move inward.

In the above-described transport carriage 14, the front wheels 13 of the carriage 11 are steered in the opposite direction to the front carriage 11 when turning, so that it is necessary when turning on a narrow road or turning a corner in an acute angle. However, it becomes possible to travel without being affected by the difference between the inner wheels. Therefore, the transport carriage 14 in which a plurality of carriages 11 are connected can be smoothly turned, and the work for separating the carriage 11 at the time of turning, equipment for cutting corners, attaching protective members, etc. are unnecessary. Further, since the penetrating portion 22 of the connecting rod 19 is biased by the pair of springs 23 to maintain the neutral state, the cart 11 is maintained in the straight traveling state even if the road surface is inclined during straight traveling.

[0012]

According to the carrier truck of the present invention, in which a plurality of carriages are connected, each carriage is connected by a connecting steering mechanism for steering the front wheels in a direction opposite to the steering direction of the front carriage. At the time of turning, the following wheel is steered by the connecting steering mechanism in the direction opposite to the steering direction of the front wheel, so that the wheel can be turned without being affected by the difference between the inner wheels. As a result, the work of separating the bogie at the time of turning becomes unnecessary, and it is not necessary to take measures for contact with the corners, so that the turning performance can be improved and the equipment can be simplified.

The left and right front wheels of the bogie are connected by a connecting shaft, one end of which is rotatably supported by the rear end of the front bogie and the other end of which is rotatably supported by the connecting shaft, and the middle part of which is the bogie. Since the connecting and steering mechanism is constituted by the connecting rod rotatably supported on the fulcrum, the trolley can be turned by the simple mechanism without being affected by the inner ring difference. Further, since the connecting rod is biased in a neutral state with respect to the fulcrum of the bogie, the straight traveling state is maintained regardless of the condition of the road surface during straight traveling, and the straight traveling performance is improved.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a connecting portion of a carriage constituting a carrier truck according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a front portion of a truck.

FIG. 3 is an explanatory view of a traveling state of a carrier vehicle.

FIG. 4 is an overall configuration diagram of a conventional carrier truck.

FIG. 5 is an explanatory view of a traveling state of a conventional carrier truck.

[Explanation of symbols]

 11 Carriage 12 Main Body 13 Front Wheel 14 Transport Carriage 15 Center Shaft 16 Bracket 17 Connection Shaft 18 Connection Steering Mechanism 19 Connection Rod 20 Pin 21 Support Point 22 Penetration 23 Spring

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Goichi Sasada 5-3-8 Shiba, Minato-ku, Tokyo Mitsubishi Motors Corporation (72) Inventor Hiroshi Ohira 5-3-8 Shiba, Minato-ku, Tokyo Mitsubishi Automobile Industry Co., Ltd. (72) Inventor Yoshikazu Sasaki 5-3-8 Shiba, Minato-ku, Tokyo Mitsubishi Motors Industry Co., Ltd.

Claims (3)

[Claims] 1. A transport carriage in which a plurality of carriages are connected and the left and right front wheels of each carriage are supported steerably by a connecting steering mechanism for steering the front wheels in a direction opposite to the steering direction of the front carriage. A carrier truck that is characterized by connecting each truck. 2. The left and right front wheels of the bogie are connected by a connecting shaft, and the connecting and steering mechanism has one end rotatably supported by a rear end of a front bogie and the other end rotatably by the connecting shaft. The carrier truck according to claim 1, wherein the carrier truck is supported and a middle portion thereof is a connecting rod rotatably supported by a fulcrum of the truck. 3. The carrier truck according to claim 2, wherein the connecting rod is biased in a neutral state with respect to a fulcrum of the truck.