JPH05181526A - Wiring protector for pickup coil - Google Patents

Abstract

PURPOSE:To allow wiring for pickup coil to smoothly follow up the movement of a pickup coil and further to protect the wiring so as not to generate drop- down or torsion. CONSTITUTION:A pickup coil 4 is fitted through a bracket 8 to a gear case under cover 7 of a drive unit 5. A flat guide plate 11 provided with a bent plane at one part is fitted to a machine platen 3 so that the bent plane can be made close as much as possible within a range not to interfere with the rotary orbit of a steering wheel 2. In the case of a posture to advance the steering wheel 2 straightly, a wiring 10 for pickup coil is laid just like forming a U shape on the guide plate 11, one side is locked to the guide plate 11 and the other side is locked through a clamp to the bracket 8. When the steering wheel 2 is turned, the wiring 10 follows up the movement of the pickup coil 4 with an almost fixed operation decided on the guide plate 11, and the drop- down or the torsion is prevented.

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 carrier.

[0002]

2. Description of the Related Art An unmanned vehicle is equipped with a pickup coil for detecting a guide wire laid on the ground. Generally, in the case of a fixed pickup coil as a conventional basic form, the coil is arranged in the center of the machine base along the guide line even when the machine base is turning, and the directionality is set so that it can follow at an intersection. It has a configuration in which four coils are installed in a circular shape. Also,
In recent years, a movable pickup coil has tended to be adopted as a type that can obtain higher followability than the fixed type. This is one in which the pickup coil is attached so as to follow the turning movement of the steered wheels. According to this, not only the followability at the time of turning is high, but only two pickup coils are required. This has the advantages that the control is facilitated and the control circuit on the upper side of the machine is simplified.

[0003]

By the way, in the case of the movable pickup coil described above, it is necessary to give the wiring a predetermined slack so as to allow the pickup coil to follow the turning movement of the steered wheels. Does not give any special consideration to the loosened part of the wiring, and just leaves it loose. However, the wiring having such a slack becomes twisted or hangs as the pick-up coil moves, and as a result, it is caught by a movable object (steering wheel, gear case, etc.) or a protrusion on the ground side and is disconnected. Possibly, and there is a problem in terms of its protection.

In view of the above problems, therefore, the present invention provides a wiring protection device capable of smoothly following the movement of the pickup coil and protecting the wiring for the pickup coil from dropping and twisting. To provide a technical problem to be solved.

[0005]

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 that is mounted via a bracket so as to follow the turning motion of a steered wheel, and is a flat guide plate for wiring protection that partially has an arcuate curved surface. Is mounted on the machine base so that its curved surface is as close as possible to the turning locus of the steered wheels, and the wiring for the pickup coil is mounted on the guide plate in a state where the steered wheels are in the straight-ahead posture. And a clamp 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 when the steering wheel goes straight is When rotated, the pickup coil is pulled out along with the movement of the pickup coil, and follows the guide plate with a predetermined substantially constant movement. That is, the wiring always follows the movement of the pickup coil with a movement due to a planar deformation on the guide plate, which prevents sagging or twisting.

[0007]

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 forklift shown is a three-wheel type consisting of two front wheels 1 and one rear wheel 2. The rear wheel 2 arranged in the center of the rear side of the machine base 3 also serves as a steering wheel and a drive wheel. ing. The two movable left and right pickup coils 4 for detecting the guide wire L laid on the ground side are moved so as to follow the turning operation of the rear wheels 2 (hereinafter referred to as steering wheels). It is attached at a position close to the steered wheels 2.

1 to 4 show a mounting structure of a pickup coil 4 and a wiring protection device. As shown in the drawing, the steered wheels 2 assembled to the drive unit 5 are driven via a gear train (not shown) in the gear case 6 and are turned together with the drive unit 5.
The two left and right pickup coils 4 are attached to the gear case undercover 7 on the lower side 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 fixing portion 8a which is attached to the gear case undercover 7 by a bolt 9 and a lateral bending from the fixing portion 8a to go around the rear side of the steering wheel 2. A plate member having a coil attachment portion 8b extended in such a manner and a wiring holding portion 8c horizontally projected laterally from the fixing portion 8a so as to support a part of the wiring 10. The two left and right pick-up coils 4 are attached to the coil attaching portion 8b so as to cross the vehicle center line (guide line L) when the steered wheels 2 are in the straight-ahead posture as shown in FIG.

The guide plate 11 for protecting the wiring 10 of the pickup coil 4 is partially provided with an arcuate curved portion 11a corresponding to the turning locus of the steering wheel 2, specifically, the turning locus of the pickup coil 4. Plane shape provided is approximately L
A flat plate of a rectangular shape, the curved portion 11a of which is arranged so as to be as close as possible to the turning trajectory of the pickup coil 4, and the appropriate portion thereof is attached to the machine base 3 by a fixing means such as a bolt. There is. Further, the guide plate 11 is set so that its upper surface is aligned with the upper surface of the wire holding portion 8c of the bracket 8 at substantially the same height in order to prevent the wire 10 from protruding, and has a required plane space.

On the other hand, the wiring 10 of the pickup coil 4, one end of which is connected to the power source side, is drawn out to the upper surface of the guide plate 11 and hooked on the upper rear surface of the guide plate 11 by a clamp 12. As shown in FIG. 1, the wiring 10 on the guide plate 11 is bent so as to form a substantially U-shape with the hooking point by the clamp 12 as a starting point when the steered wheels 2 are in a straight-ahead posture, and thereby steering is performed. The movable portion 10a is configured to allow the follow-up movement of the pickup coil 4 when the wheel 2 turns. A part of the U-shaped movable portion 10a reaches the upper surface of the wire holding portion 8c of the bracket 8 and is hooked by the clamp 13 on the base side of the wire holding portion 8c. The tip side from the point is pulled out along the outer surfaces of the fixed portion 8a and the coil attachment portion 8b of the bracket 8 and the necessary 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).
A slack prevention piece 15 is attached for pressing to prevent the slack.

The wiring protection device for the pickup coil 4 of this embodiment is constructed as described above, and the movable portion 10a of the wiring 10 has the guide play 11 and the wiring as described above when the steered wheels 2 are in the straight traveling posture. It exists in a U-shaped posture on the protection portion 8c. In such a state, when the steered wheels 2 are turned counterclockwise together with the drive unit 5 (the vehicle is turned right), the pickup coil 4 moves together with the bracket 8 following this, and the movable portion 10a of the wiring 10 accordingly moves. The hooking side with the bracket 8 is pulled out forward as shown in FIG. At this time, the movable part 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 in the vicinity of the wiring holding part 8c starting from the hooking point with the bracket 8 side. It deforms as it forms. Then, this U-shaped part is the movable part 10
It is effective in assisting the restoration of the a to the initial shape, and if this is not the case, the movable part 10a may be inverted. Therefore, it is necessary to set the length of the movable portion 10a in consideration of this fact.

On the other hand, when the pick-up coil 4 is moved while the steered wheels 2 are turning to the right (the vehicle is turning to the left), the movable portion 10a of the wiring 10 is rearward on the hooking side with the bracket 8 as shown in FIG. Be drawn to. As a result, the movable portion 10a is loosened from the straight-ahead posture of the steered wheels 2 shown in FIG. 1 to the right maximum turning state of FIG. 3. At this time, the loosening prevention piece attached to the bracket 8 is provided. 15
Prevents the movable portion 10a from being pushed out toward the guide plate 11 side to hang down between the guide plate 11 and the wiring holding portion 8c of the bracket 8 or to be caught by the drive wheel 2 or the gear case 6 which is a movable object.

Thus, in the wiring protection device of the present embodiment, the wiring 10 can be made to follow the movement of the pickup coil 4 with respect to the turning motion of the drive wheel 2 without difficulty, and the wiring 10 is then guided. Plate 11
Since it does not spill out from above, it is possible to protect from a wire disconnection accident due to being caught by a movable object or a ground-side protrusion due to the protrusion.

Although the present embodiment has been described in the case of being applied to a three-wheel type unmanned vehicle having one steering wheel 2, it is not necessarily limited to the three-wheel type and is also applied to a four-wheel type. I will get it. However, in that case, among the steering system constituent members, a bell crank having a rotation center on the vehicle center line generally becomes a member to which the pickup coil 4 is attached instead of the steering wheel 2.

[0017]

As described in detail above, according to the present invention,
The wiring can be made to follow the movement of the pickup coil smoothly, and the looseness of the wiring caused by the tracking can be absorbed on the guide plate to prevent it from being caught by moving objects around it or protrusions on the ground side. In addition, it is possible to prevent a disconnection accident due to it, and it is extremely effective as a wiring protection device.

[Brief description of drawings]

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

FIG. 2 is a plan view of the wiring protection device, showing the steering wheel when turning to the right.

FIG. 3 is a plan view of the wiring protection device, showing the steering wheel when turning to the left.

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

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

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

[Explanation 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)

[Claims] 1. A wiring protection device for a movable pickup coil, which is mounted via a bracket so as to follow the turning motion of a steered wheel, and which is used for wiring protection having a partially arcuate curved surface. A flat guide plate is attached to the machine base so that its curved surface is as close as possible to the turning trajectory of the steered wheel, and a wire for a pickup coil is mounted on the guide plate of the steered wheel. Crawling so as to form a substantially U-shape in the state of straight advancement, so that one end of the U-shape is aligned with the bracket of the pickup coil and the other end is aligned at substantially the same height on the guide plate. Wiring protection device for pick-up coil characterized by being hooked via clamps.