JP3094344B2 - Electric wheels for electric vehicles - Google Patents

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 using an electric motor as a driving power, and more particularly to an electric wheel in which an outer rotor type motor is mounted on a 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 having an outer rotor type motor mounted on a wheel to constitute a direct drive device, is disclosed in, for example, Japanese Patent Application Laid-Open No. 63-275427 by the same applicant. It is disclosed and belongs to the public domain.

[0003]

[Problems to be solved by the present invention]
The direct drive type electric wheel disclosed in Japanese Patent No. 275427 has a configuration in which components 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 aesthetic appearance unfavorable, but also there is a risk that the motor portion may hit the curb when the vehicle is parked in parallel or the like, and may be damaged or carelessly hit another object. However, if the components of the motor are simply pushed in so as to fit inside the outer edge of the wheel rim, the position of the ball joint of the suspension will be pushed inward by the pushed amount, and as a result, The offset amount L (see FIG. 1) of the kingpin becomes large, and the steering operation becomes abnormally heavy, which is impractical. Therefore,
SUMMARY OF THE INVENTION It is an object of the present invention to solve the drawback of the conventional direct drive type electric wheel, which is caused by the motor protruding outside 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 is, as shown in FIG. 2, a permanent magnet piece 3 is attached to the inner peripheral surface thereof to form a rotor, and a stator in which a coil 7 is wound around an armature core 6 laminated on an outer peripheral surface of a cone 5 attached to an axle shaft 4 is rotated by the stator. In a motor-driven wheel in which the outer rotor type motor is mounted on the wheel and constitutes a direct drive device, the wheel disc 1 includes an axle shaft 4 The component of the motor is installed 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 lower portion of the knuckle 11 is extended to a space 26 formed between the brake disk 10 and the wheel disk 1,
A ball joint 13 is provided on the extension portion 12 to form a fulcrum of the lower arm 15.

[0005]

The components of the motor are installed closer to the inside by the amount that the wheel disc 1 is formed concavely toward the inside of the axle shaft 4, the protrusion is eliminated, and the wheel rim 8 is more protruded than the outer edge of the wheel rim 8. It is the shape that is housed inside. On the other hand, the brake disc 10
A sufficiently large space 26 is formed between the brake disc 10 and the wheel disc 1 by an amount corresponding to. The ball joint 13 which is a fulcrum of the lower arm 15 is provided outside the brake disc 10 by using the space 26.
Is provided, the king pin offset L is a sufficiently small 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, a wheel disc 1 of the wheel is rotatably mounted 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 concave inward of the axle shaft 4 with respect to the center line PQ of the wheel. On the outer surface of the wheel disc 1, a cylindrical back yoke 2 made of pure iron or a material equivalent thereto is attached concentrically with bolts 22, and a permanent magnet piece 3 is mounted 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 of the axle shaft 4 with a nut 23.
, A stator configured by winding a coil 7 is combined with a narrow gap between the stator and the permanent magnet piece 3 of the rotor,
This outer rotor type motor is mounted on wheels to form a direct drive device. The feature of this motor is that each component of the motor is installed closer to the inner side of the axle shaft 4 by effectively utilizing the concave shape of the wheel disc 1, and the component configuration of the motor including the motor outer cover 19 is provided by this arrangement. Whole rim 8
And inside the outer edge of the tire 20. A large space is secured on the radially inner side of the armature core 6 as an inner diameter portion of the cone 5 that is opened outward, and a power line 18 and an 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 in a concentric arrangement with bolts 24. At the inner end of the adapter 9, a brake disc 10 is mounted in a concentric arrangement, again with bolts 25, so that a fairly large cavity 26 is formed between the brake disc 10 and the inner surface of the wheel disc 1.
On the other hand, a hub 27 at the inner end of the axle shaft 4 is supported by the knuckle 11. The lower part of the knuckle 11
As described above, the brake disk 10 is extended overhanging toward the space 26 between the brake disk 10 attached to the wheel disk 1 via the adapter 9 and the inner surface of the wheel disk 1. A ball joint 13 is provided and serves as a fulcrum for the lower arm 15. A midpoint portion of the lower arm 15 is provided with a coil damper unit 29 attached downward to the body frame 28.
Swingably supported. The ball joint 14 provided on the upper part of the knuckle 11 is
6 fulcrums. The other ends of the lower arm 15 and the upper arm 16 are rotatably attached to the vehicle body, respectively. With the above arrangement, the king pin offset L can be suppressed to an appropriate value as shown in FIG.

[0008]

[Effects of the Present Invention] The electric wheel for an electric vehicle according to the present invention has a good external appearance because the motor portion does not protrude outward from the outer edge of the wheel rim 8.
The danger of the motor part being unexpectedly hit with something and being damaged or injured can be greatly reduced. Knuckle 11
Of the lower arm 1 is overhanged to the space 26 between the brake disc 10 and the wheel disc 1, and a ball joint 13 is provided on the extension 12.
Since the fulcrum is set to 5, the offset amount L of the kingpin is suppressed to an appropriate value, thereby preventing the steering operation of the vehicle from becoming heavy and improving the steering performance and practicability.

[Brief description of the drawings]

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

[Explanation of symbols]

 Reference Signs List 1 wheel disc 2 back yoke 3 permanent magnet piece 4 axle shaft 5 cone 6 armature iron core 7 coil 8 wheel rim 9 adapter 10 brake disc 26 void 11 knuckle 12 knuckle extension 13 ball joint 15 lower arm

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Noboru Fujiwara 2-4-1 Nishi-Atsujigaoka, Chofu-shi, Tokyo Tokyo Electric Power Company Technical Research Institute (72) Inventor Masao Ono Shinyoshida, Kohoku-ku, Yokohama, Kanagawa Prefecture 4415-2 in Tokyo R & D Co., Ltd. (72) Inventor Atsushi Mamiya 4415-2 in Shin-Yoshida-cho, Kohoku-ku, Yokohama, Kanagawa Prefecture (72) Inventor Katsumi Umemura Katsumi Umemura, Kohoku-ku, Yokohama, Kanagawa 4415-2 Shinyoshidacho Tokyo R & D Co., Ltd. (56) References JP-A-63-275427 (JP, A) JP-A-3-17832 (JP, A) JP-A-3-31029 (JP, A) JP-A-2-120198 (JP, A) JP-A-54-21312 (JP, U) JP-A-62-139814 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B60K 7/00 B62M 7/12

Claims (1)

(57) [Claims] 1. A back yoke is mounted on a wheel disc, a permanent magnet piece is mounted on an inner peripheral surface of the back yoke to form a rotor, and a coil is wound around an armature core laminated on an outer peripheral surface of a cone mounted on an axle shaft. In the electric wheel in which the outer rotor type motor is attached to the wheel to form a direct drive device, the wheel disc is an axle. It is concave toward the inside of the shaft, and the components of the motor are installed inside the outer edge of the wheel rim using the concave shape. A lower portion of the knuckle is mounted to a space formed between the brake disk and the wheel disk where the brake disk is mounted. , And a ball joint is provided on the extension to form a fulcrum of a lower arm.