JPH05116545A - Motor-driven wheel for electric car - Google Patents

Abstract

PURPOSE:To enhance the controllability of an electric car by removing the part of a motor portion protruding outside of the outside edge of a wheel rim so as to make the motor portion look better and reduce damaging of the motor, and reducing the offset of a king pin. CONSTITUTION:A wheel disk 1 is freely rotatably installed around the outer periphery of a hollow axle shaft 4 and is so formed to be recessed inward of the axle shaft 4 past a vehicle center line P-Q. Each of the components of a motor is installed near the inside of the axle shaft 4 by utilizing this recessed form and all of the components of the motor are stored inside of the respective outside edges of a wheel rim 8 and a tire 20. A brake disk 10 is mounted on the wheel disk 1 via an adaptor 9 so that a dead space 26 is formed between the brake disk 10 and the wheel disk 1. A ball joint 13 serving as the supporting point of a lower arm 15 is provided by utilizing the dead space 26 so that the offset L of a king pint is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive wheel of an electric vehicle which uses an electric motor as a driving power, and more particularly to an electric wheel in which an outer rotor type motor is attached to the wheel to constitute a direct drive device.

[0002]

2. Description of the Related Art An electric wheel for an electric vehicle, particularly an electric wheel in which an outer rotor type motor is attached to the wheel to constitute a direct drive device, is disclosed, for example, in Japanese Patent Laid-Open No. 63-275427 by the same applicant. It is disclosed and belongs to the public domain.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The direct drive type electric wheel disclosed in Japanese Patent No. 275427 has a configuration in which constituent elements of a motor are mounted on an outer portion of a wheel disk of a wheel, and the motor portion largely protrudes outside the wheel. For this reason, not only is the appearance aesthetically unpleasant, but there is also the risk that the motor portion will hit the curb when it is parked in parallel, and may be damaged or inadvertently bumped into another object to cause damage. However, if you simply push the motor components so that they are located inside the outer edge of the wheel rim, the position of the suspension ball joint will be pushed inward as much as it is pushed in. The kingpin offset amount L (see FIG. 1) becomes large and the handle operation becomes abnormally heavy, which is impractical. Therefore,
It is an object of the present invention to solve the problem, which is a drawback of the conventional direct drive type electric wheel, caused by the motor protruding beyond the outer edge of the wheel rim of the wheel.

[0004]

As a means for solving the above-mentioned problems of the prior art, an electric wheel for an electric vehicle according to the present invention has a wheel disk 1 and a back yoke as shown in FIG. 2, the permanent magnet piece 3 is attached to the inner peripheral surface thereof to form a rotor, and the stator in which the coil 7 is wound around the armature iron core 6 laminated on the outer peripheral surface of the cone 5 attached to the axle shaft 4 is rotated. In an electric wheel in which the outer rotor type motor is attached to a wheel to form a direct drive device, the wheel disk 1 is connected to the axle shaft 4 by a narrow gap provided between the wheel disk 1 and the permanent magnet piece 3 of the child. Of the wheel rim 8 is arranged inside the outer edge of the wheel rim 8 by utilizing the concave shape. Adapter 9 at the inner end of Le disk 1
The brake disc 10 is attached via the, and the lower part of the knuckle 11 is extended to a space 26 formed between the brake disc 10 and the wheel disc 1.
A ball joint 13 is provided on the extension 12 to form a fulcrum of the lower arm 15.

[0005]

The components of the motor are installed closer to the inner side by the amount that the wheel disc 1 is formed in a concave shape toward the inner side of the axle shaft 4, and the protrusion thereof is eliminated, so that the outer edge of the wheel rim 8 is more than the outer edge. The shape will be stored inside. On the other hand, the brake disc 10 via the adapter 9
A sufficiently large space 26 is formed between the brake disc 10 and the wheel disc 1 by the amount corresponding to the attachment. Utilizing the space 26, the ball joint 13 serving as a fulcrum of the lower arm 15 is provided outside the brake disc 10.
Is provided, the kingpin offset amount L is a sufficiently small numerical value.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. In the direct drive type electric wheel shown in FIG. 1, the wheel disc 1 of the wheel is rotatably installed on the outer periphery of a hollow axle shaft 4 via a ball bearing 21. The wheel disc 1 is formed in a concave shape that is considerably recessed inward of the axle shaft 4 with respect to the center line PQ of the wheel. A cylindrical back yoke 2 made of pure iron or a material similar thereto is attached to the outer surface of the wheel disk 1 in a concentric arrangement with bolts 22, and a permanent magnet piece 3 is provided on the inner peripheral surface of the back yoke 2. It is fixed and this is the rotor. on the other hand,
An armature core 6 is assembled by laminating silicon steel plates on the outer peripheral surface of the cone 5 fixedly attached to the outer end portion of the axle shaft 4 by a nut 23.
A stator formed by winding a coil 7 on the rotor is assembled with a small gap between the stator and the permanent magnet piece 3 of the rotor.
This outer rotor type motor is attached to the wheels to form a direct drive device. The characteristic of this motor is that each constituent element of the motor is installed closer to the inner side of the axle shaft 4 by effectively utilizing the concave shape of the wheel disk 1. With this arrangement, the constituent elements of the motor including the motor outer cover 19 are included. Whole wheel rim 8
And the inner side of the outer edge of the tire 20. A large space is secured inside the armature core 6 in the radial direction as an inner diameter portion of the cone 5 that is opened outward, and the power line 18 and the encoder 17 are housed therein. An adjuster plate 31 attached to the motor outer cover 19 so that the rotation angle can be adjusted and a shaft of the encoder 17 attached to the cone 5 are connected by a coupling shaft 30.

Next, a substantially cylindrical adapter 9 is attached to the inner end of the wheel disc 1 with bolts 24 in a concentric arrangement. At the inner end of the adapter 9, a brake disc 10 is also mounted concentrically with bolts 25, forming a rather large cavity 26 between the brake disc 10 and the inner surface of the wheel disc 1.
On the other hand, the hub 27 at the inner end of the axle shaft 4 is supported by the knuckle 11. The lower part of the knuckle 11 is
As described above, it is extended in the form of an overhang toward the space 26 between the brake disc 10 attached to the wheel disc 1 via the adapter 9 and the inner surface of the wheel disc 1, and this extension 12 is provided with A ball joint 13 is provided and serves as a fulcrum for the lower arm 15. The midpoint portion of the lower arm 15 is a coil damper unit 29 mounted downward on the vehicle body frame 28.
It is swingably supported by. The ball joint 14 provided on the upper portion of the knuckle 11 is used for the upper arm 1.
It is said to be the fulcrum of 6. The other ends of the lower arm 15 and the upper arm 16 are rotatably attached to the vehicle body. With the above arrangement, the kingpin offset amount L can be suppressed to an appropriate value as shown in FIG.

[0008]

EFFECTS OF THE INVENTION The electric wheel for an electric vehicle according to the present invention does not have the motor portion protruding outward from the outer edge of the wheel rim 8, and therefore has a good appearance.
The risk of the motor section accidentally hitting something and getting damaged or injured can be greatly reduced. Also, knuckle 11
The lower part of the lower arm 1 is extended to an empty space 26 between the brake disc 10 and the wheel disc 1 in the form of an overhang, and the extension 12 is provided with a ball joint 13.
Since the fulcrum of 5 is used, the offset amount L of the kingpin is suppressed to an appropriate value, which prevents the steering operation of the automobile from becoming heavy and enhances the steerability and the practicality.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an electric wheel for an electric vehicle according to an embodiment of the present invention.

[Explanation of symbols]

 1 Wheel Disc 2 Back Yoke 3 Permanent Magnet Piece 4 Axle Shaft 5 Cone 6 Armature Core 7 Coil 8 Wheel Rim 9 Adapter 10 Brake Disc 26 Cavity 11 Knuckle 12 Knuckle Extension 13 Ball Joint 15 Lower Arm

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuo Natori 2-4-1, Nishitsujigaoka, Chofu-shi, Tokyo Inside the TEPCO Technical Research Institute (72) Noboru Fujiwara 2-4-1 Nishiazajioka, Chofu-shi, Tokyo (72) Inventor Masaro Ono 4415-2 Shinyoshida-cho, Kohoku-ku, Yokohama-shi, Kanagawa Prefecture Tokyo R & D Co., Ltd. (72) Atsushi Mamiya 4415 Shin-yoshida-cho, Kohoku-ku, Yokohama-shi, Kanagawa Prefecture -2 Tokyo R & D Co., Ltd. (72) Inventor Katsumi Umemura 4415 Shinyoshida-cho, Kohoku-ku, Yokohama-shi Kanagawa-2 Tokyo R & D Co., Ltd.

Claims (1)

[Claims] 1. A back yoke is attached to a wheel disk, a permanent magnet piece is attached to an inner peripheral surface of the wheel disk to form a rotor, and a coil is fixed around an armature core laminated on an outer peripheral surface of a cone attached to an axle shaft. In an electric wheel in which a rotor is combined with a permanent magnet piece of the rotor with a narrow gap, and the outer rotor type motor is attached to the wheel to form a direct drive device, the wheel disc is an axle. A concave shape is formed toward the inner side of the shaft, the constituent elements of the motor are installed inside the outer edge of the wheel rim by utilizing the concave shape, and an inner end of the wheel disc is connected via an adapter. The lower part of the knuckle to which the brake disc is attached and to the void formed between the brake disc and the wheel disc Is extended, and a ball joint is provided on the extension to form a fulcrum of a lower arm.