JPH0351541Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to the improvement of drive devices for vehicles such as automatic guided vehicles. The present invention relates to a structure in which a rotating wheel of a wheel can be easily replaced in a wheel drive device.

(Prior art) In conventional automated guided vehicles, the drive source, such as a geared motor, and the wheels are each provided independently, and the two are connected by a chain or shaft coupling, etc., and the rotation of the drive source is increased or decreased. It was transmitting to the wheel.

However, in conventional wheel transmission mechanisms, the speed reducer and rotation transmission mechanism are separately attached to the outside of the wheel, so the entire device requires a large amount of space, and these configurations pose problems. The layout around the wheels was becoming difficult.

On the other hand, a trochoid type planetary gear reducer is also known, which has a structure in which an internal gear is rotated at a reduced speed, and a rotating body such as a sprocket is attached to the internal gear. (Refer to Japanese Patent Publication No. 49-1332 and Japanese Patent Publication No. 56-18815) In each of the above-mentioned known planetary gear reduction gears, the internal gear that takes out the decelerated rotation is supported in a cantilevered manner by the fixed side. Therefore, if the internal gear were to be used as a wheel, the external load of the vehicle, etc. would be supported from one side of the wheel in a cantilevered manner by the fixed side, causing deflection and damage to the planetary gear reducer. Unreasonable loads were applied to the meshing parts, causing noise and abnormal wear.

In order to improve the above-mentioned drawbacks, a wheel drive device has also been proposed in which the load of the vehicle is supported on both sides of the wheel. (Jitsugan 60-151058
(Problem to be solved by the invention) However, in the wheel drive device with the built-in planetary gear reducer, it is necessary to replace the rotating wheel of the wheel. The work was complicated and the handling was not satisfactory. That is, when replacing the rotary ring of the wheel, it has become necessary to disassemble the planetary gear reducer or to remove the clutch.

The purpose of the present invention is to improve the above-mentioned drawbacks, to achieve miniaturization and simplification of the transmission mechanism with a simple structure by incorporating a planetary gear reducer in the wheel, and to support the wheel on both sides of the planetary gear reducer. It is an object of the present invention to provide a structure that facilitates wheel replacement in a wheel drive device that eliminates the load burden on a planetary gear reducer.

(Means for solving the problems) The present invention is characterized by the following configuration.

A device for driving a vehicle by decelerating rotation from a drive source and transmitting it to a wheel, the wheel comprising an inner cover, an outer cover, and a rotating ring that is fitted and fixed to the outer periphery of the inner cover and the outer cover. an inner frame that is fixed to the vehicle and supports the wheel from the inside of the vehicle; an outer frame that is fixed to the vehicle or the inner frame and supports the wheel from the outside of the vehicle; and an outer frame that is fixed to the inner frame and supports the wheel from the inside of the vehicle. In a wheel drive device comprising an extending drive source and a planetary gear reducer mounted inside the wheel, a bearing that supports the wheel is connected to the inner cover and the inner cover on both sides of the planetary gear reducer. The outer frame is provided between the frame and between the outer cover and the outer frame to support the load of the vehicle on both sides, and the outer frame is detachably attached to the inner frame or the vehicle. A coupling member is detachably provided on the bearing and fixes the rotating ring and the outer cover. By removing the outer frame and releasing the fixation between the coupling member and the outer cover, the wheel can be fixed. The fitting and fixing of the rotating wheel is removable from the outside of the vehicle.

(Example) This will be explained below using figures.

First, a known planetary gear reduction gear will be explained with reference to FIGS. 3 and 4.

In this known example, the planetary gear reducer reduces the rotation speed input from an input shaft 1 connected to a drive source (not shown), and applies the reduced rotation to an output shaft 2.

The mechanism for this deceleration is as follows. Eccentric bodies 3 ₁ and 3 ₂ are provided on the input shaft 1 with a predetermined phase difference (180° in this example). The respective eccentric bodies 3 ₁ , 3 ₂ connect to external gears 5 ₁ , 3 through rollers 4 .
5 It is in contact with ₂ . A plurality of inner roller holes 6 are provided in the external gears 5 ₁ and 5 ₂ , into which an inner pin 7 and an inner roller 8 are fitted. Here, the inner roller 8 can be omitted. External teeth 9 such as a trochoid tooth shape or an arc tooth shape are provided on the outer periphery of the external gears 5 ₁ and 5 ₂ , and the external pins 11 provided on the internal gear 10 internally mesh with the external teeth. .

The inner pin 7 is fixed to or fitted into the flange portion 12 of the output shaft 2.

In this known example, one rotation of the input shaft 1 corresponds to the rotation of the eccentric body 3.
₁ , 3 ₂ , but since the external gears 5 ₁ , 5 ₂ are restrained from rotating by the inner roller hole 6 and the inner pin 7 and are allowed to oscillate, the external gears 5 ₁ , 5 ₂
When the difference between the number of teeth and the number of external pins 11 (number of teeth) is 1, one rotation of the input shaft 1 causes the external teeth 9 of the external gears 5 ₁ , 5 ₂ and the internal teeth of the internal gear 10 to The pin 11 meshes with the external gears 5 ₁ and 5 ₂ by one tooth and is displaced (shifted). Therefore, one rotation of the input shaft 1 is decelerated to 1/the number of teeth of the external gears 5 ₁ and 5 ₂ , and the rotation is transmitted to the output shaft 2 via the inner pin 7 .

In this case, when the output shaft 2 is fixed, the rotation of the input shaft 1 is extracted as the rotation of the internal gear 10. In the present invention, the rotation of the internal gear is directly extracted as the rotation of the wheel.

An embodiment of a wheel drive device according to the present invention using a planetary gear reducer as described above is shown in FIG.
This will be explained in detail below with reference to FIG.

An inner frame 13 ₁ is fixed to the chassis T of the vehicle, and the inner frame 13 ₁ supports the wheels 14 from the inside of the vehicle. An outer frame 13 ₂ that supports the wheel 14 from the outside of the vehicle is detachably fixed to the inner frame 13 ₁ . The outer frame ₁₃₂ may be detachably fixed to the vehicle chassis. A motor M serving as a driving source is fixed to the inner frame 13 ₁ so as to extend from the wheel 14 to one side. By locating the motor M inside the vehicle, there is no problem with the outside of the vehicle, resulting in high safety, and, as will be described later, the wheels can be replaced easily.

The wheel 14 has an inner cover 14A and an outer cover 14.
B and a rotating wheel 14C.
C is provided on the outer periphery of the inner cover 14A and the outer cover 14B and on the outer periphery of an internal gear to be described later. Bearings 15 and 16 are provided between the inner cover 14A of the wheel 14 and the inner frame 13 ₁ and between the outer cover 14B of the wheel 14 and the outer frame 13 ₂ , respectively.
are provided to support the wheel 14 on both sides. This reduces the vehicle load to the inner frame 13 ₁
and the inner cover 14A and outer cover 14 of the wheel 14 from the outer frame 13 ₂ via bearings 15 and 16.
B, so no load acts on the planetary gear reducer, which will be described later.

A speed reducer 17 is built in between the inner cover 14A and the outer cover 14B.

The reducer 17 is a planetary gear reducer shown in FIGS. 1 and 2, and includes an input shaft 18, an eccentric body 19, and an external gear 2.
0, an inner pin 21, an inner roller 22, and an internal gear 23. The inner pin 21 is fixed to a mounting frame 24, and the mounting frame 24 is fixed to the inner frame ₁₃₁ at a position on the same side as the motor M.
The inner roller 22 can be omitted. The rotating ring 14C of the wheel 14 is removably fitted to the outer circumferences of the internal gear 23, the inner cover 14A, and the outer cover 14B from the outer cover 14B side. A connecting member 26 is provided to connect the rotating ring 14C and the outer cover 14B, and the connecting member 26 is fixed to the rotating ring 14C with bolts 25 ₁ and to the outer cover 14B with bolts 25 ₂ . ing. The extraction tap hole 27 is used when pulling out the rotary wheel 14C as described later.

The input shaft 18 is supported by an inner cover 14A and an outer cover 14B of the wheel 14 by two bearings 28 and 29. As a result, the input shaft 18 is placed in a dual-supported state, and the deceleration mechanism can be stabilized. Input shaft 18 is connected to motor M.

The operation of the present invention configured as above will be explained below.

Transmission of rotation by motor M is as follows. The rotation of the motor M is transmitted to the reducer 17 via the input shaft 18, and is reduced in speed by the planetary gear reducer.
The reduced rotation is transferred from the internal gear 23 to the wheel 14.
The wheel 14 rotates while being decelerated to a predetermined reduction ratio.

When replacing the rotating ring 14C of the wheel 14, first remove the outer frame 13 ₂ , then remove the bolt 2.
5 Remove ₂ . Next, an operating tool (not shown, but a rotating tool with a screw) is inserted into the extraction tap hole 27 and rotated to remove the connecting member 26 and the rotating ring 14C.
Fit a new rotating ring 14C for replacement, connect and fix the rotating ring 14C and the outer frame 14B with the connecting member 26 and the bolts 25 ₁ and 25 ₂ , fit the outer frame 13 ₂ to the bearing 16, Further, the inner frame 13 ₁ is fixed to the outer frame 13 ₂ .

In addition, the load of the vehicle is transferred from the frame 13 to the bearing 15,
16 to the inner cover 14A and outer cover 14B of the wheel 14, and is received by the rotating wheel 14C, so that no load acts on the planetary gear reducer.

The above is one embodiment of the present invention, and the present invention is not limited to the above embodiment.

FIG. 3 shows another preferred embodiment of the wheel 14 applied to the present invention.

Rotating ring 14C of wheel 14 and outer cover 14B
The spigot diameter R ₁ is the rotary ring 14C and inner cover 1.
The pilot diameter is different from the pilot diameter R ₂ of 4A, and there is a relationship of R ₁ <R ₂ .

According to this embodiment of the wheel 14, the rotating wheel 1
This has the advantage of simplifying the mounting work when mounting the 4C on the outer cover 14B and the inner cover 14A.

(Effects of the invention) The effects of the invention, which is constructed and operates as described above, are as follows.

The rotating wheels can be easily replaced from outside the vehicle.

Since the vehicle's load is supported by the wheel frame, no unreasonable force is applied to the reducer. Therefore, the reduction gear itself does not need to be reinforced in terms of strength, and the overall structure can be simplified.

The load from the vehicle is supported by two bearings across the reducer, so the support is stable.

Since the reducer is built into the wheel, the device can be made smaller and the design around the wheel can be simplified.

Since the motor is attached to the frame at a position inside the vehicle with respect to the wheel, there is no part of the wheel protruding to the outside of the vehicle, resulting in a safer structure and further simplifying the overall structure.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure shows the fixing of the connecting member, B-B in Figure 1.
3 is a partial sectional view showing an example of a wheel applied to the present invention, FIG. 4 is a sectional view showing an example of a known planetary gear reducer, and FIG. It is an AA sectional view. T: Chassis, 13 ₁ : Inner frame, 13 ₂ : Outer frame, 14: Wheel, 14A: Inner cover, 14
B: Outer cover, 14C: Rotating wheel, M: Motor, 1
5, 16: Bearing, 17: Reducer, 18: Input shaft,
19: Eccentric body, 20: External gear, 21: Internal pin,
22: inner roller, 23: internal gear, 24: mounting frame, 25 ₁ , 25 ₂ : bolt, 26: connecting member,
28, 29: Bearing.

Claims (1)

[Claims for Utility Model Registration] A device for driving a vehicle by decelerating rotation from a drive source and transmitting it to wheels, wherein the wheels fit into an inner cover, an outer cover, and the outer peripheries of the inner cover and the outer cover. an inner frame that is fixed to the vehicle and supports the wheel from the inside of the vehicle; an outer frame that is fixed to the vehicle or the inner frame and supports the wheel from the outside of the vehicle; and the inner frame. In a wheel drive device comprising a drive source fixed to the vehicle and extending inwardly of the vehicle, and a planetary gear reducer mounted inside the wheel, a bearing supporting the wheel sandwiches the planetary gear reducer. Provided between the inner cover and the inner frame on both sides and between the outer cover and the outer frame to support the load of the vehicle on both sides,
The outer frame is removably provided on the inner frame or the vehicle, the outer frame is removably provided on the bearing, and a connecting member for fixing the rotating ring and the outer cover is removably provided,
The planetary gear mechanism is characterized in that by removing the outer frame and releasing the fixation between the connecting member and the outer cover, the fitting and fixing of the rotating ring of the wheel can be attached and detached from the outside of the vehicle. wheel drive device.