JP3136733B2 - Wiring protection device for pickup coil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiring protection device for a movable pickup coil in an unmanned vehicle such as an unmanned forklift or an unmanned transport vehicle.

[0002]

2. Description of the Related Art An unmanned vehicle has a pickup coil for detecting a guide line laid on the ground. Generally, in the case of a fixed pickup coil as a conventional basic form, the coil is arranged at the center of the machine so as to follow the guide line even when turning the machine, and has a directionality so that it can follow even at an intersection. It has a configuration in which four coils are installed so as to form a circular shape. Also,
In recent years, a movable pickup coil has tended to be used as a type that can achieve higher tracking performance than the fixed type. This is one in which the pickup coil is mounted so as to follow the turning operation of the steered wheels. According to this, not only is the follow-up property at the time of turning high, but also since only two pickup coils are required, There are advantages such as easy control and simplification of the control circuit on the machine.

[0003]

By the way, in the case of the above-mentioned movable pickup coil, it is necessary to allow the wiring to have a predetermined slack so as to allow the pickup coil to follow the turning operation of the steering wheel. Does not give any special consideration to the slack portion of this wiring, but simply leaves it loose. However, the wiring having such a slack is twisted or sagged due to the movement of the pi-up coil, and as a result, is caught by a movable object (a steering wheel, a gear case, or the like), a protrusion on the ground side, or the like, and is disconnected. And there is a problem in terms of its protection.

In view of the above-mentioned problems, the present invention provides a wiring protection device which can smoothly follow the movement of the pickup coil with respect to the movement of the pickup coil and can protect the wiring from drooping and twisting. Is a technical problem to be solved.

[0005]

Means for Solving the Problems In order to solve the above problems, the present invention is configured as follows. That is, a wiring protection device for a movable pickup coil mounted via a bracket so as to follow a turning operation of a steered wheel, wherein a flat guide plate for wiring protection having a partly arcuate curved surface is provided. Is attached to the machine so that the curved surface does not interfere with the turning trajectory of the steered wheels as much as possible, and the wiring for the pick-up coil is mounted on the guide plate in the straight running posture of the steered wheels. , So that one end of the U-shape is aligned with the coil bracket of the pickup coil, and the other end is aligned with the guide plate at substantially the same height. It is characterized by being hooked through.

[0006]

In the wiring protection device for a pickup coil according to the present invention configured as described above, the wiring arranged on the guide plate so as to form a U-shape in the straight traveling posture of the steering wheel is such that the steering wheel is When the swing operation is performed, the pickup coil is pulled out along with the movement of the pickup coil, and follows with a substantially constant predetermined movement on the guide plate. That is, the wiring always follows the movement of the pickup coil with the movement due to the planar deformation on the guide plate, thereby preventing drooping or twisting.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. 5 and 6 schematically show a reach type unmanned forklift. The illustrated forklift is of a three-wheel type including two front wheels 1 and one rear wheel 2, and a rear wheel 2 disposed at a rear center portion of the machine base 3 serves as a steering wheel and a driving wheel. ing. Then, the two movable left and right pickup coils 4 for detecting the guide line L laid on the ground side move so as to follow the turning operation of the rear wheel 2 (hereinafter, referred to as a steering wheel). It is attached at a position close to the steering wheel 2.

FIGS. 1 to 4 show a mounting structure of the pickup coil 4 and a wiring protection device. As shown in the figure, the steered wheels 2 mounted on the drive unit 5 are driven via a gear train (not shown) in a gear case 6 and are turned together with the drive unit 5.
The two left and right pickup coils 4 are attached to the lower gear case under cover 7 of the drive unit 5 via a bracket 8 so as to follow the turning of the steered wheels 2.

The bracket 8 for mounting the pickup coil is, specifically, a fixed portion 8a which is mounted on the gear case under cover 7 by a bolt 9, and is bent laterally from the fixed portion 8a to wrap around the steering wheel 2. A plate member having a coil mounting portion 8b extended as described above and a wire holding portion 8c horizontally protruding laterally so as to form a horizontal plane from the fixing portion 8a for supporting a part of the wire 10. The two right and left pick-up coils 4 are mounted on the coil mounting portion 8b so as to straddle the vehicle center line (guide line L) when the steered wheels 2 are in the straight traveling posture as shown in FIG.

A guide plate 11 for protecting the wiring 10 of the pick-up coil 4 partially has an arc-shaped curved portion 11a corresponding to the turning locus of the steering wheel 2, specifically, the turning locus of the pickup coil 4. The plane shape provided is approximately L
In a state in which the curved portion 11a is arranged as close as possible to the turning locus of the pickup coil 4, an appropriate portion thereof is attached to the machine base 3 by fixing means such as bolts. I have. The guide plate 11 is set so that the upper surface thereof is aligned with the upper surface of the wiring holding portion 8c of the bracket 8 at substantially the same height in order to prevent the wiring 10 from protruding, and has a required plane space.

On the other hand, the wiring 10 of the pickup coil 4 whose one end is connected to the power supply side is drawn out to the upper surface of the guide plate 11 and is hooked by a clamp 12 on the rear upper surface of the guide plate 11. As shown in FIG. 1, the wiring 10 on the guide plate 11 is bent so as to form a substantially U-shape starting from the point of engagement by the clamp 12 when the steered wheels 2 are in the straight running posture, thereby enabling steering. The movable portion 10a for allowing the follow-up movement of the pickup coil 4 when the wheel 2 turns is configured. A part of the U-shaped movable portion 10a reaches the upper surface of the wiring holding portion 8c of the bracket 8 and is hooked by a clamp 13 on the base side of the wiring holding portion 8c. The distal end side is drawn out along the outer surfaces of the fixing portion 8a and the coil mounting portion 8b of the bracket 8 and the required portion is stopped by the clamp 14 and connected to the pickup coil 4.

The bracket 8 has a movable portion 10a of the wiring 10 when the steered wheels 2 turn right (when the vehicle turns left).
, And a slack preventing piece 15 for preventing the slack from being pressed is attached.

The device for protecting the wiring of the pickup coil 4 according to the present embodiment is constructed as described above. The movable portion 10a of the wiring 10 includes the guide play 11 and the wiring as described above when the steered wheels 2 are in the straight running posture. It exists in a U-shaped posture on the protection part 8c. In this state, when the steered wheels 2 turn counterclockwise together with the drive unit 5 (the vehicle turns right), the pickup coil 4 moves together with the bracket 8 following this, and the movable part 10a of the wiring 10 is accordingly moved. The side where the bracket 8 is engaged with the bracket 8 is drawn forward as shown in FIG. At this time, the movable portion 10a is deformed so as to be stretched by being placed on the guide plate 11, but at the maximum cutting angle, a small U-shape is formed near the wiring holding portion 8c starting from the point of engagement with the bracket 8 side. Deforms to form. The U-shaped part is
This is effective in assisting the return of a to the initial shape, and if there is no such, there is a possibility that the movable portion 10a is inverted. Therefore, it is necessary to set the length of the movable portion 10a in consideration of this.

On the other hand, when the pick-up coil 4 moves while the steered wheels 2 turn right (the vehicle turns left), the movable portion 10a of the wiring 10 is moved rearward as shown in FIG. Drawn to. This causes the movable portion 10a to be slackened between the straight-moving posture of the steered wheels 2 shown in FIG. 1 and the rightmost turning state shown in FIG. 3, but at this time, the slack preventing piece attached to the bracket 8 Fifteen
Pushes the movable portion 10a toward the guide plate 11 to prevent the movable portion 10a from hanging down between the guide plate 11 and the wiring holding portion 8c of the bracket 8 or being caught by the driving wheel 2 or the gear case 6, which is a movable object.

Thus, in the wiring protection device according to the present embodiment, the wiring 10 can follow the movement of the pickup coil 4 with respect to the turning operation of the driving wheel 2 without difficulty. Plate 11
Since it does not run off from above, it can be protected from a disconnection accident caused by a movable object or a ground-side projection caused by the protrusion.

Although the present embodiment has been described with reference to a case where the invention is applied to a three-wheel type unmanned vehicle having one steering wheel 2, it is not necessarily limited to a three-wheel type. Gain. However, in this case, a bell crank having a center of rotation on the vehicle center line in general is a member to which the pickup coil 4 to be replaced with the steered wheel 2 is to be attached.

[0017]

As described in detail above, according to the present invention,
The wiring can smoothly follow the movement of the pick-up coil, and the slack of the wiring caused by the following can be absorbed on the guide plate to prevent the movable object and the protrusion on the ground from being caught on the guide plate. It is possible to prevent a disconnection accident caused by this, and it is extremely effective as a wiring protection device.

[Brief description of the drawings]

FIG. 1 is a plan view of a pickup coil wiring protection device according to an embodiment of the present invention, showing a case where a steered wheel is in a straight-ahead posture.

FIG. 2 is a plan view of the wiring protection device, showing a state where a steered wheel is turning right.

FIG. 3 is a plan view of the wiring protection device, showing a state where the steered wheels are turning left.

FIG. 4 is a side view of the wiring protection device.

FIG. 5 is a schematic plan view of the unmanned vehicle.

FIG. 6 is a schematic side view of an unmanned vehicle.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 2 ... Steering wheel 3 ... Machine stand 4 ... Pickup coil 5 ... Drive unit 8 ... Bracket 8a ... Fixed part 8b ... Coil mounting part 8c ... Wiring holding part 10 ... Wiring 10a ... Movable part 11 ... Guide plate

Claims (1)

(57) [Claims] 1. A wiring protection device for a movable pickup coil mounted via a bracket so as to follow a turning operation of a steered wheel, the wiring protection device having a partly arcuate curved surface for wiring protection. A flat guide plate is mounted on the machine base so that its curved surface does not interfere with the turning trajectory of the steering wheel as much as possible. Wiring for a pickup coil is provided on the guide plate on the steering wheel. In a straight-ahead posture, the U-shape is adjusted so as to form a substantially U-shape, and one end of the U-shape is aligned with the bracket of the pickup coil, and the other end is aligned with the same height on the guide plate. Wiring protection devices for pickup coils, each of which is hooked via a clamp.