JP2525030Y2 - Drive wheels for electric vehicles - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The invention relates to a drive wheel of an electric vehicle provided with an improvement for facilitating inspection and replacement of a tire and an electric motor.

(Prior Art) Conventionally, for example, Japanese Utility Model Laid-Open No. 49-71656 and Japanese Utility Model Laid-Open No. 48-926.
As disclosed in Japanese Patent Publication No. 69, there is a vehicle in which an electric motor is attached to driving wheels of an electric vehicle such as a forklift truck and the tire is rotated by the electric motor.

These housed a reduction gear and a drive motor inside the tire to make the overall dimensions of the drive wheel compact,
A so-called wheel-in-motor system is adopted.

(Problems to be Solved by the Invention) However, in the former publication, since the electric motor and the reduction gear mechanism are provided with the tire interposed therebetween, when replacing the tire, the reduction gear mechanism is removed. Since the entire electric motor protrudes to the side of the tire, it is necessary to reduce the size of the electric motor by using a flat motor.

The latter publication discloses a structure in which a driving motor supported in a non-rotating state is accommodated in a drum in which tires are fitted on the outer periphery, so that compactness can be achieved without using a flat motor. However, on the other hand, it was difficult to replace the tires, and it was extremely difficult to check and replace the electric motor.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a rotary shaft having a horizontal shaft mounted on a bearing portion attached to a step-shaped soldering portion provided at one end of an electric motor. The bearing portion is attached to the lower side of the steering shaft of the vehicle or to a vertical mounting portion on the side of a bracket attached to the vehicle frame to support and fix the electric motor, and the outer periphery of a flange portion of the bearing portion is provided. A ring member is rotatably provided, a reduction gear mechanism is interposed between the ring member and the rotation shaft, the ring member is rotatably connected to the ring member, and a bearing is provided on the outer periphery of the stamping portion of the electric motor. It is configured to be rotatable through, and to be detachably attached to the ring member, and to be configured to support the electric motor in a cantilever manner on the side of the tire. Fit outside Bearing for supporting rotatably the Ya is that where the structure is located in the width direction of the center of the tire, further, the ring member to detachably attach the tire,
It is a drive wheel of an electric vehicle configured to stably support the tire by interposing a sliding ring between the bearing and a flange of the bearing.

(Function) In the present invention, the stamping part of the electric motor is supported and fixed to the vertical mounting part of the bracket via the bearing part, and the ring member is rotatable via the sliding member on the outer periphery of the flange part of the bearing part. Provided, the tire is rotatably mounted on the outer periphery of the seal portion via a bearing, and is detachably attached to the ring member,
Since the electric motor is cantilevered on the side of the tire, the drive wheels can be made compact, and the tire can be easily attached to and detached from the electric motor, thereby facilitating inspection and replacement. In addition, since the electric motor is also supported at the side of the tire in a cantilever manner, no accessory is interposed therearound, so that inspection and replacement can be easily performed.

Further, the ring member for detachably mounting the tire has a sliding ring interposed between the ring member and the flange portion of the bearing portion, so that the tire can be stably supported.

(Embodiment) FIG. 1 is a sectional view showing a configuration of an embodiment of the present invention.

This embodiment shows an example in which the present invention is applied to steerable driving wheels of an electric vehicle such as a forklift truck.

The steering shaft 22 is supported by the vehicle body frame, and rotates in the horizontal direction by operating a handle (not shown).

At the lower end of the steering shaft 22, a bracket 13 having a substantially L-shaped vertical section and bulging in a circular arc shape in a direction perpendicular to a paper surface having an opening on the left side and the lower surface in the figure is attached.

At the center of the vertical mounting portion 13b on the side surface of the bracket 13, a cylindrical boss portion 13a is formed so as to protrude in the horizontal direction, and a bearing portion 14 is fitted and fixed to the boss portion 13a.

The bearing portion 14 is composed of a flange portion 14a and a shaft support portion 14b, and has an insertion hole at the center thereof for rotatably inserting the rotary shaft 23 of the electric motor 1. This flange portion 14a is connected to one end of the electric motor 1. It is provided so as to be able to be mounted in a crown shape on the end face side of the stamping portion 1A formed in a stepped shape in the portion. The support shaft 14b is provided so as to be inserted into the boss 13a of the bracket 13. The rotating shaft 23 of the electric motor 1 is inserted through the bearing portion 14 provided in this manner, and the flange portion 14a is mounted in a crown shape and fastened by the bolt 16. In the electric motor 1 with the bearing portion 14 attached as described above, the bearing portion 14 is inserted into the boss portion 13a of the bracket 13 and the nut 15 is screwed into a screw portion formed at the same end portion to be fastened and fastened. ,
The key 21 prevents the rotation. In this mounting state, the electric motor 1 is cantilevered and supported by the vertical mounting portion 13b of the bracket 13 via the bearing portion 14.

One bearing 4 is fitted around the seal 1A of the electric motor 1, and its inner ring is
The tire 2 is sandwiched between the outer peripheral edge portion a and the stepped portion 1c of the stamping portion 1A to prevent displacement in the axial direction, and the tire 2 is rotatably mounted around the stamping portion 1A via the bearing 4. At the same time, the tire 2 is detachably mounted by a plurality of bolts 3 on a ring member 5 rotatably mounted on the outer periphery of the flange portion 14a of the bearing portion 14. The electric motor 1 is cantilevered so as to protrude laterally with respect to the tire 2 thus mounted.

An internal gear 6 is fixed to the inner periphery of the ring member 5 at a plurality of positions by bolts 7.
The upper part of 13 has a shaft of a small diameter gear 8 meshing with the internal gear 6.
8 a is rotatably inserted through a bearing 9.

A large-diameter gear 12 is keyed on the right end of the shaft 8a of the small-diameter gear 8 in the drawing.
The large-diameter gear 12 meshes with a gear portion 1a formed on a rotation shaft 23 of the electric motor 1 by being attached by 11 to rotate integrally with the shaft 8a.

Therefore, the gear portion 1a, the large-diameter gear 12, the small-diameter gear 8, and the internal gear 6 constitute a reduction gear mechanism that reduces the rotational output of the electric motor 1 and transmits the rotational output to the tire 2.

FIG. 2 is a diagram showing a gear portion taken out to facilitate understanding of the transmission path of the reduction gear mechanism.

On the outer surface of the bracket 13, a cover 19 having a bearing 10 for rotatably supporting the tip of the shaft 8a of the small diameter gear and a bearing 24 for rotatably supporting a rotating shaft 23 of the electric motor 1 is provided with bolts 20. Bracket at multiple locations
Fixed to 13.

A rotating shaft 23 of the electric motor 1 is
The brake 18 for stopping the rotation of the cover 19 is fixed to the cover 19 at a plurality of positions by bolts 25.

The bearing 4 is arranged on the center line of the tire 2 in the width direction.

Also, the inner periphery of the ring member 5 and the flange portion of the bearing portion 14
The outer periphery of 14a is closely opposed, and a sliding ring 17 driven and fixed to the inner periphery of the ring 5 is in sliding contact with the outer periphery of the flange portion 14a. That is, the inner periphery of the ring member 5 and the outer periphery of the flange portion 14a are in sliding contact with each other via the sliding ring 17.

 Next, the operation of the present embodiment will be described.

A drive current is supplied to the electric motor 1 by a controller (not shown) in accordance with forward rotation or reverse rotation,
Rotates.

The rotation of the rotating shaft 23 is reduced by the large-diameter gear 12, the small-diameter gear 8, and the internal gear 6 and transmitted to the tire 2.
To rotate.

The electric motor 1 does not rotate because it is fixed to the bearing portion 14 integrated with the bracket 13.

When the steering shaft 22 is rotated, the bracket 13 is also rotated in the horizontal direction, and therefore, the electric motor 1 and the tire 2 are also rotated in the horizontal direction, so that steering is performed.

In this embodiment, since the tire 2 is rotatably mounted on the outer periphery of the seal portion 1A of the electric motor 1 via one bearing 4, the case where a plurality of bearings 4 are used and the tire 2 is mounted on the rotating shaft of the electric motor The size in the width direction is reduced as compared with the case where it is arranged on the side.

Moreover, since the bearings 4 are arranged directly on the outer periphery of the seal portion 1A of the electric motor 1, the diameter of the tire 2 can be reduced as compared with a case where a bearing for the tire is separately provided. Thereby, downsizing of the drive wheels in the height direction can be achieved.

In addition, since the single bearing 4 is used, a deformation of the bearing 4 due to a load applied to the bearing 4 occurs,
In this embodiment, in order to prevent the vibration of the rotation of the tire 2 from occurring, the ring member 5 and the flange portion 14a of the bearing portion 14 are brought into sliding contact with each other through the sliding ring 17 so that the upper and lower portions of the tire 2 The fluctuation has been suppressed.

Further, in the present embodiment, the bearing 4 is arranged on the center line of the tire 2 in the width direction, so that the bearing 4 is located at the center of the load of the tire 2. It can be supported perpendicular to it.

In order to inspect the tire 2, if the inspection is performed from the left side in FIG. 1, the inspection can be easily performed since the tire 2 is entirely exposed. When replacing the tire 2, the tire 2 can be easily removed by removing the bolt 3 from the left direction in FIG. This is an effect of a configuration in which the electric motor 1 is supported in a cantilever manner, and the tire 2 is fitted on the outer periphery of the sealing portion 1A of the electric motor 1.

Similarly, with the configuration in which the electric motor 1 is supported in a cantilever manner, since the electric motor 1 is exposed on the left side in FIG. 1, the brush 1b can be easily replaced or inspected. Further, the replacement of the electric motor 1 can be relatively easily performed by removing the tire 2 and removing the bolt 16.

In the above-described embodiment, an example in which the present invention is applied to the steerable drive wheels is shown.However, the present invention is not limited to this, and the bracket 13 is attached to the lower surface of the body frame,
It can also be used as a non-steering drive wheel.

Further, it is needless to say that the electric vehicle to which the present invention can be applied is not limited to a truck such as a forklift, but can also be applied to a general vehicle such as an electric passenger car or a motorcycle.

(Effects of the Invention) As described in detail above, the present invention has a structure in which the tire rotates around the outer periphery of the sealing portion of the electric motor, and the electric motor is supported in a cantilever manner by the bracket, so that the driving wheel is compact. The tire can be easily removed from the non-support side of the electric motor, and replacement and inspection of the tire can be easily performed.

In addition, according to the present invention, the electric motor is supported in a cantilever manner, and since there is no accessory on the non-support side, the electric motor can be easily inspected or replaced.

Further, since the sliding ring is interposed between the outer periphery of the flange portion of the bearing portion and the ring member, the tire can be stably supported by cooperation between the bearing and the sliding ring on the tire side. .

[Brief description of the drawings]

FIG. 1 is a sectional view showing the configuration of an embodiment of the present invention, and FIG. 2 is a front view of a gear train constituting a reduction gear mechanism in the embodiment. 1 Electric motor 1a Gear 2 Tire 4 Bearing 5 Ring 6 Internal gear 8 Small diameter gear 12 Large diameter gear 13 Bracket 14 Bearing 14a … Flange part 17… Sliding ring 22 …… Steering shaft 23 …… Rotating shaft

Claims (3)

(57) [Scope of request for utility model registration] 1. A rotary shaft is horizontally inserted through a bearing mounted on one side of a step-shaped stamping part provided on one end of an electric motor, and the bearing is located below a steering shaft of a vehicle or a vehicle frame. Attached to a vertical attachment portion on the side of the bracket attached to the bracket to support and fix the electric motor, a rotatable ring member is provided on the outer periphery of a flange portion of the bearing portion, and the ring member and the rotating shaft are connected to each other. A ring member is rotatably connected with a reduction gear mechanism interposed therebetween, and a tire is rotatably mounted on the outer periphery of the soldering portion of the electric motor via a bearing and detachably attached to the ring member. A drive wheel for an electric vehicle, wherein the drive wheel is provided to support the electric motor in a cantilever manner on a side of the tire. 2. A utility model registration as claimed in claim 1, wherein said bearing for rotatably supporting the tire by being externally fitted to said seal portion is one bearing positioned on the center line in the width direction of said tire. A drive wheel of the electric vehicle according to the description. 3. A utility model registration wherein the ring member for detachably mounting the tire is provided with a sliding ring between the ring member and a flange portion of the bearing portion so as to stably support the tire. 3. The driving wheel of the electric vehicle according to item 1 or 2.