JPS62116335A - Automatic conveyor vehicle - Google Patents

Abstract

PURPOSE:To prolong a span of service life in a ball bearing, by constituting the static electricity electrified in a truck frame to be led into a rim with the ball bearing bypassed, in case of a vehicle which supports each wheel, installing a conductive rubber tire on an outer circumference of the metallic rim, on an axle setting shaft via the ball bearing. CONSTITUTION:A conveyor vehicle 1 is made up of attaching plural traveling wheels 4 to the underside of a truck frame 2, and it is designed so as to travel on a nonconductive traveling passage 5 constituted of embedding a conductive traveling passage (unillustrated herein) of an iron frame or the like in a proper place. Each wheel 4 is constituted in a way of attaching a conductive rubber tire 9 to an outer circumferential surface of a metallic rim 8 to be supported free of rotation via a ball bearing 7 made up of installing a steel ball 7c interposingly between inner and outer rails 7b and 7a on the circumference of a wheel setting shaft 4a. In this case, one end of a conductive plate 11 is made contact with a ring 12 to be fitted in the wheel setting shaft 4a and tightly screwed by a nut 10, and the other end is locked to the side of the rim 8 with a bolt 13 whereby the desired end comes to fruition.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is a self-contained vehicle that can prevent damage to the ball bearings in the wheel portions when static electricity is discharged to the conveyor vehicle. Regarding lJ transport JIT.

[Conventional technology]

FIG. 2 is a sectional view showing the running state of a conventional transport vehicle.

In FIG. 2, reference numeral 1 denotes a carrier, and a control device 3 is mounted on a carrier frame 2 of the carrier.

A plurality of wheels 4 for running are attached to the lower surface of the truck frame 2, and the wheels 4 roll on a non-conductive running path 5'2 such as concrete 1, so that the carrier 1 can run. It has become.

A conductive running path 6 such as an iron frame is provided at a predetermined location of the non-conductive running path 55. This conductive running path 6 is for discharging static electricity charged on the truck frame 2 to the ground.

Conventionally, in order to perform this discharge well, the wheel 4 is not shown in FIG. 3 and is constructed as shown in FIG. FIG. 3 is an enlarged sectional view of the wheel 4 portion. As is clear from FIG. 3, a ball bearing 7 is attached to the outer peripheral surface of the wheel attachment shaft 4n.

In this ball bearing 7, steel balls 7C are pressed between an outer 1 north 7n and an inner race 7h. A metal rim 8 is fitted onto the outer circumference of the outer race 7a of the ball bearing 7, and a tire 9 made of conductive rubber is mounted on the outer circumference of the rim 8.

Note that 10 is a nut, which fixes the wheel 4 to the wheel mounting shaft 4a.

With this configuration, the static electricity charged on the truck frame 2 is directed in the directions of arrows A1 to A3, that is, from the truck frame 2 to the wheel mounting shaft 4a to the inner race 7 of the ball bearing.
b - Steel ball 7 c - Outer race 7a - Rim 8 - It flows into the non-conductive running path 5 or the conductive running path 6 via the path of the tire 9 made of conductive rubber.

[Problem that the invention seeks to solve]

In conventional transport vehicles, when the static electricity is discharged, the steel balls 7c interposed between the outer race 7a and the inner race 7b of the ball bearing 7 are in point contact, so there is a risk that the contact portion may melt due to the discharge. There is a drawback that the dovetail ball bearing 7 is damaged. Along with this, there is a drawback that the wheels 4 cannot be moved smoothly.

The invention of Party B was made to solve this problem, and aims to provide an automatic guided vehicle that prevents damage to the ball bearings of the wheels and allows the wheels to be transferred smoothly.

[Means for solving problems]

The self-t*m transmission Jlffi according to the present invention has a conductive plate made of a conductive material attached to the side of the rim of the wheel, and a conductive ring that is in constant contact with the conductive plate attached to the wheel mounting shaft. be.

[For production]

In this invention: The static electricity charged on the stand + 1t frame is discharged from the wheel mounting shaft to the ground through the tire path consisting of the ring, conductive plate, and Rimu conductive rubber.
Bypassing the path through the steel balls of ball bearings.

〔Example〕

The following is the origin of this invention! An embodiment of the l1lJ transport lit will be described based on the drawings. FIG. 1 is a sectional view mainly showing the wheel portion in one embodiment.

In FIG. 1, the same parts as in FIGS. 2 and 3 are given the same reference numerals to avoid duplication, and different parts will be mainly explained.

In FIG. 1, a conductive plate 11, a ring 12, and a bolt 13 are newly added to the configuration shown in FIG. 3. That is, the conductive plate 11 is made of a conductive material such as a steel plate, and has a mounting hole formed near one end thereof.

One end of the conductive plate 11 is inserted into the port 1- through the mounting hole.
13 is screwed onto the side surface of the rim 8, and the other end is attached so as to be in contact with the outer peripheral surface 12a of the ring 12 fitted to the wheel mounting shaft 4a. The ring 12 is inserted into the wheel mounting shaft 4a, and the ring 12 is screwed onto the wheel mounting shaft 4a with a nut 10. The other configurations are the same as in FIG. 3.

With this configuration, the static electricity charged on the truck frame passes from the arrow All through the wheel mounting shaft 4a, and as shown by the arrow A12, the ring 12 - conductive plate 11 -
Rim 8 - Tire made of conductive rubber 9 - Non-conductive running 1M
It is discharged to the earth via l5 or conductive running path 6.

In this way, when static electricity is discharged, the ring 12. It passes through the route of the conductive plate 11 and bypasses the route of the ball bearing 7. therefore,
Unlike the conventional ball bearing 7, no electrical discharge occurs between the inner and outer races 7b and 7a of the ball bearing 7 and the steel balls 7C interposed therebetween, so that the two do not melt and become damaged.

It goes without saying that the wheel 1 in the above embodiment may be applied to both or one of the driving wheels and the driven wheels of the automatic guided vehicle.

Further, in this embodiment, the conductive plate 11 and the ring 1
Although the configuration in which the conductive plate 11 and the ring 12 are separated from each other has been described, it is of course possible to apply a configuration in which the conductive plate 11 and the ring 12 are integrally configured.

[Effects of the Invention] As explained above, the present invention provides a conductive plate made of a conductive material on the rim of the wheel and attaches a ring to the wheel mounting shaft, thereby charging the bogie frame through the ring and the conductive plate. By bypassing the generated static electricity and preventing static electricity from passing through the ball bearing, damage to the point contact portion of the ball bearing due to discharge can be prevented. Along with this, the wheels can be driven smoothly, and
There is no possibility that the discharge of static electricity will adversely affect the on-board electronic IA device.

[Brief explanation of drawings]

FIG. 1 is an enlarged cross-sectional view of the wheel portion of an embodiment of the automatic guided vehicle of the present invention, FIG. 2 is a cross-sectional view showing the schematic configuration of a conventional automatic guided vehicle, and FIG. 3 is a conventional automatic guided vehicle. FIG. 3 is an enlarged cross-sectional view of a wheel portion in FIG. 1. Transport vehicle, 2. Dolly, 3. Control equipment, 4.
Wheel, 4a... Wheel mounting shaft, 5... Non-conductive running path, 6... Conductive running path, 7... Ball bearing, 7C... Steel ball,
8. Rim, 9. Tire made of conductive rubber, 10. Nut, 11. Conductive plate, 12. Ring, 13.
·bolt. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Masuo Oiwa (2 others) Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] In an automatic guided vehicle equipped with a ball bearing mounted on the wheel mounting shaft of the guided vehicle and a tire made of conductive rubber attached to the outer periphery of the ball bearing with a rim, one end is fixed to the side surface of the rim. 1. An automatic guided vehicle, comprising: a conductive plate; and a conductive ring, which is in constant contact with the other end of the conductive plate, is mounted on the wheel mounting shaft.