JPH0538948A - Driving device of carrier - Google Patents

Abstract

PURPOSE:To obtain stable travel performance even at the time of crawling travel. CONSTITUTION:In a carrier drive unit, a travel motor 2 installed at a body 1 is connected to a driving wheel 8, fitted in the turnable state to the bottom part of the body 1, through a reduction gear 7. The travel motor 2 is formed of a main motor 2a and a sub-motor 2b of smaller capacity. The main motor 2a is provided with an electromagnetic brake 4 released at the time of current flowing, and an electromagnetic clutch 5 is provided between the sub-motor 2b and the reduction gear 7. Crawling travel can be performed by the sub-motor 2b of small capacity, so that stable travel performance can be obtained even at the time of crawling travel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive device for a guided vehicle such as an automated guided vehicle.

[0002]

2. Description of the Related Art FIG. 1 shows a conventional drive system for an automated guided vehicle.
The ones shown in are known. The drive device has drive wheels a.
An upper part of a gear case b that supports the vehicle is pivotally attached to a vehicle body d via a bearing c, and is driven by a traveling motor e installed on the vehicle body d side via a reduction gear (not shown) in the gear case b. The wheel a is driven to rotate. In the figure, f is a turning gear and g is an electromagnetic brake. However, in the above drive device, usually 1 km / H to 10 km
Since it is designed to run at 1 km / H, 1 km /
It is difficult to obtain stable running at low speeds below H. In order to improve the above-mentioned drawback, as shown in FIG. 2, by providing a high speed electromagnetic clutch h and a low speed electromagnetic clutch i between the traveling motor e and the speed reducer, and switching to the low speed electromagnetic clutch i when traveling at a very low speed, It has been proposed that the rotation speed of the traveling motor e can be further reduced by the low speed gear j.

[0003]

However, when the emergency power supply is turned off in the above drive device, both the high speed electromagnetic clutch h and the low speed electromagnetic clutch i are disengaged and the driving wheels a are not braked. Therefore, in the case of an unmanned guided vehicle in particular, there is a problem that the vehicle is out of control and dangerous. In addition, since the large traveling motor e used during normal traveling is used even at low speed traveling, the efficiency is poor, and the height of the electromagnetic clutches h and i is high, resulting in a lack of stability in terms of appearance. There was a problem such as not being preferable. The present invention has been made for the purpose of improving the above-mentioned problems, and an attempt is made to improve the safety and efficiency by providing a drive device for a guided vehicle that is driven by a small child motor when traveling at a very low speed. It is a thing.

[0004]

In order to achieve the above object, the present invention connects a traveling motor installed on a vehicle body and a drive wheel rotatably mounted on the bottom of the vehicle body via a speed reducer. In the drive device for the guided vehicle described above, the traveling motor is composed of a parent motor and a child motor having a smaller capacity, and the parent motor is provided with an electromagnetic brake that releases when energized, and between the child motor and the reducer. An electromagnetic clutch is provided.

[0005]

[Operation] Since the child motor having a small capacity is used when traveling at a low speed with the above configuration, stable traveling performance can be obtained, and the safety can be improved because the electromagnetic brake provided on the parent motor can be used for braking.

[0006]

Embodiment An embodiment of the present invention will be described in detail with reference to the drawings shown in FIGS. In these figures, reference numeral 1 denotes a vehicle body of a carrier vehicle, which is composed of a parent motor 2a and a child motor 2b.
The base traveling motor 2 is mounted so as to face each other with the bevel gear box 3 interposed therebetween. A motor larger than the child motor 2b is used as the parent motor 2a of the traveling motor 2 and the electromagnetic brake 4 is attached to the rear portion thereof.
The bevel pinion 3a in the bevel gear box 3 is attached to the rotating shaft 2c of the parent motor 2a.

A bevel pinion 3b in a bevel gear box 3 is attached to a rotary shaft 2d of a child motor 2b having a smaller capacity than that of the parent motor 2a via an electromagnetic clutch 5, and these bevel pinions 3a and 3b are driven. Bevel gears 3d fixed to the upper end of the shaft 3c are in mesh with each other so that the drive shaft 3c can be driven by the parent motor 2a and the child motor 2b.

On the other hand, on the lower surface of the vehicle body 1 below the bevel gear box 3, a gear case 7 of a speed reducer 7 is mounted via a bearing 6.
a is attached so as to be rotatable. The gear case 7a
A drive wheel 8 is rotatably supported by an axle 9 at the lower part of the vehicle, and the drive shaft 3c and the axle 9 are connected by a reduction gear (not shown) housed in a gear case 7a.

The operation will now be described. When the vehicle body 1 travels at a high speed, the electromagnetic clutch 5 is turned off and the drive wheels 8 are driven by the parent motor 2a to travel. Further, since the electromagnetic brake 4 for braking the vehicle body 1 adopts a system of releasing when energized, it energizes during traveling and turns off during braking to brake the drive wheels 8.

When the vehicle body 1 is traveling at a very low speed, the electromagnetic clutch 5 is turned on to drive the drive wheels 8 by the child motor 2b. Since the child motor 2b has a smaller capacity than the parent motor 2a, a minute speed of 1 km / H or less can be easily obtained, and the electromagnetic brake 4 provided on the parent motor 2a is used for braking. That is, since the drive shaft 3c and the parent motor 2a are directly connected even when the child motor 2b travels, the parent motor 2
The drive wheel 8 can be braked by using the electromagnetic brake 4 of a.

On the other hand, when the vehicle body 1 is stopped or the power is automatically turned off in an emergency, the parent motor 2a, the child motor 2b, the electromagnetic brake 4, and the electromagnetic clutch 5 are no longer energized.
Since the electromagnetic brake 4 employs a method of braking when not energized, the vehicle body 1 can be stopped safely.

[0012]

As described above in detail, according to the present invention, the traveling motor is composed of the parent motor and the child motor, and the child motor travels when traveling at a very low speed. Therefore, a stable speed can be obtained even when traveling at a very low speed. At the same time, it is economical as it is more efficient than the one driven by a large traveling motor. In addition, since the electromagnetic brake of the parent motor can be used for braking when traveling at a very low speed, it is not necessary to provide an electromagnetic brake for the child motor, and the vehicle body can be braked by the electromagnetic brake in an emergency so that the vehicle body does not run out of control. It's safe. In addition, since the vehicle height can be lowered by placing the traveling motor horizontally, the stability of the vehicle body is increased and the appearance is improved.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a conventional drive device.

FIG. 2 is an explanatory diagram showing a conventional drive device.

FIG. 3 is a partially cutaway plan view of a drive device according to an embodiment of the present invention.

FIG. 4 is a partially cutaway front view of the drive unit.

[Explanation of symbols]

1 vehicle body, 2 traveling motor, 2a parent motor, 2b child motor, 3 bevel gear box, 4 electromagnetic brake,
5 electromagnetic clutch, 7 speed reducer, 8 drive wheels.

Claims (2)

[Claims] 1. A drive system for a transport vehicle, wherein a traveling motor 2 installed on a vehicle body 1 and a drive wheel 8 rotatably mounted on a bottom portion of the vehicle body 1 are connected via a speed reducer 7. The motor 2 is composed of a parent motor 2a and a child motor 2b having a smaller capacity, and the parent motor 2a is provided with an electromagnetic brake 4 for electromagnetically releasing the electromagnetic wave.
A drive device for a carrier vehicle, which is provided with an electromagnetic clutch 5 between b and a speed reducer 7. 2. The drive device according to claim 1, wherein the parent motor 2a and the child motor 2b of the traveling motor 2 are arranged laterally and are arranged so as to face each other with the bevel gear box 3 interposed therebetween.