JP3094345B2 - Wheel motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel motor used for a drive wheel of an electric vehicle, and more particularly to a wheel motor which is mounted on a wheel as an outer rotor type motor and constitutes a direct drive device.

[0002]

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

[0003]

[Problems to be solved by the present invention]
The wheel motor that constitutes the direct drive device for an electric wheel disclosed in Japanese Patent No. 275427 has a configuration in which components of the motor are mounted on an outer portion of a wheel disk of the wheel, and the motor portion largely extends to the outside of the wheel. It is protruding. For this reason, not only is the appearance of the design aesthetically unfavorable, but also there is a risk that the motor will hit the curb when the vehicle is parked in parallel or the like and that it will be damaged, or that nearby objects will be damaged.

[0004] It is necessary to prepare a tachometer (speedometer) or odometer for an electric vehicle, and therefore, rotation of a wheel motor is monitored by an encoder. However, it is difficult to secure a space for installing the encoder at the axis of the wheel motor. In general, the encoder is usually installed so as to protrude further outside the wheel motor. As a result, there is an increased risk that the encoder portion may accidentally hit the curb or other object and cause damage or damage to the other object.

Accordingly, it is an object of the present invention to provide a wheel motor in which the encoder portion does not protrude outside the outer edge of the wheel rim of the wheel.

[0006]

As a means for solving the above-mentioned problems of the prior art, a wheel motor according to the present invention has a back yoke 2 attached to a wheel disc 1 as shown in FIG. A permanent magnet piece 3 is attached to the inner peripheral surface to form a rotor, and an armature core 6 laminated on an outer peripheral surface of a cone 5 attached to an axle shaft 4.
The stator with the coil 7 wound thereon is the permanent magnet piece 3 of the rotor.
The outer rotor type motor is mounted on wheels to form a direct drive device,
The cone 5 has a hollow structure opened outward and has a large inner diameter, and an encoder 17 for monitoring the rotation of the motor is installed in the hollow portion of the cone 5. On the other hand, the adjuster plate 31 is attached to the motor outer cover 19 so that the rotation angle can be adjusted freely, and the shaft 17a of the encoder 17 and the adjuster plate 31 are connected by the coupling shaft 30.

[0007]

The encoder 17 is installed in the hollow portion of the cone 5 and installed inside the motor outer cover 19, and the rotation of the wheel motor is monitored by the encoder 17. The rotation angle of the motor (the motor outer cover 1) is adjusted by adjusting the rotation angle of the adjuster plate 31.
9) and the phase of the rotation angle of the encoder 17 can be adjusted.

[0008]

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 mounted on the outer periphery of the axle shaft 4 via a ball bearing 21. The wheel disc 1 is formed in a concave shape that is considerably depressed inside the center line PQ of the wheel. A cylindrical back yoke 2 made of pure iron or a material equivalent thereto is provided on an outer surface of the wheel disc 1.
Are mounted concentrically with bolts 22, and a permanent magnet piece 3 is fixed to the inner peripheral surface thereof, which is used as a rotor.
On the other hand, an armature core 6 is assembled by laminating a silicon steel plate on the outer peripheral surface of the cone 5 fixed and attached to the inner end of the axle shaft 4 with a nut 23.
A stator formed by winding a coil 7 is combined with a narrow gap between the stator and the permanent magnet piece 3 of the rotor. Thus, the outer drive type motor is attached to the wheels to constitute a direct drive device. The feature of this wheel motor is that each component of the motor is installed closer to the inner side by effectively utilizing the concave shape of the wheel disc 1, and this arrangement structure allows the motor outer cover 1
9 is housed inside the outer edges of the wheel rim 8 and the tire 20.

The radially inner part of the armature core 6 is defined as the inner diameter of the hollow structure cone 5 which is opened outward.
In addition, the inner diameter of the cone 5 is formed as large as possible to secure a wide space. In addition to the power line 18 introduced from the hollow portion of the hollow axle shaft 4, an encoder 17 is housed in the hollow portion of the cone 5.
The encoder 17 includes a bolt 3 at the opening edge of the cone 5.
Using the plate 33 attached in 2, the shaft 17
a is located inward on the center line of rotation of the motor. Therefore, the encoder 17 is easily accommodated inside the motor outer cover 19. On the other hand, the adjuster plate 31 is attached to the motor outer cover 19 by bolts 34 so that the rotation angle can be adjusted, as shown in detail in FIGS. That is, a disc 36 is fixed to the outer periphery of the adjuster plate 31 by a bolt 35 in a concentric arrangement, and the disc 36 is fitted in a circular recess of substantially the same shape and the same size formed on the motor outer cover 19. An arc-shaped groove 37 is formed concentrically on the circular plate 36, and the adjuster plate 31 is fixed to the adjusting plate 34 screwed into the motor outer cover 19 through the arc-shaped groove 37. Therefore, when the adjusting bolt 34 is loosened, the disk 36
Can be adjusted within the range of the length of the arc-shaped groove 37. The adjuster plate 31 and the shaft 17a of the encoder 17 are coupled to the coupling shaft 3
It is connected by 0. Therefore, by loosening the adjusting nut 34 and adjusting the rotation angle of the adjuster plate 31, the motor outer cover 1 that rotates integrally with the rotor (back yoke 2) and indicates the rotation angle of the motor.
9 and the encoder 17 indicated by the shaft 17a
The phase with the rotation angle can be easily adjusted.

Next, a substantially cylindrical adapter 9 is attached to the inner end of the wheel disc 1 in a concentric manner with bolts 24, and the inner end of the adapter 9 is attached to the brake disc 1
0 is mounted concentrically with bolts 25 to form a large space 26 between the brake disc 10 and the inner surface of the wheel disc 1. The hub 27 at the inner end of the axle shaft 4 is supported by the knuckle 11. The lower portion of the knuckle 11 is extended in an overhanging manner toward the space 26 between the brake disk 10 attached to the wheel disk 1 and the inner surface of the wheel disk 1 via the adapter 9 as described above, This extension 12
The lower ball joint 13 is provided on the lower arm 1
5 fulcrums. The midpoint of the lower arm 15 is swingably supported by a coil damper unit 29 attached to the body frame 28 downward.
The ball joint 14 provided above the knuckle 11
It is a fulcrum of the upper arm 16. 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 offset amount L of the kingpin is suppressed to an appropriate value as shown in FIG.

[0011]

According to the wheel motor of the present invention, the encoder 17 for monitoring the rotation of the motor is housed in the inner diameter of the armature (stator), and the wheel disc 1
Because it does not protrude outward, the appearance is good, and the danger of the encoder part accidentally hitting something and being damaged or damaging other objects has been eliminated. Further, by adjusting the adjuster plate 31, the rotation angle of the motor and the phase of the rotation angle of the encoder 17 can be easily adjusted from the outside, so that the accuracy of monitoring the rotation of the motor by the engorder 17 is improved.

[Brief description of the drawings]

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

FIG. 2 is an enlarged sectional view of an encoder and an adjuster plate.

FIG. 3 is an enlarged perspective view of an encoder and an adjuster plate.

[Explanation of symbols]

 Reference Signs List 1 wheel disc 2 back yoke 3 permanent magnet piece 4 axle shaft 5 cone 6 armature core 7 coil 8 wheel rim 17 encoder 19 motor outer cover 31 adjuster plate 17a encoder shaft 30 coupling shaft 34 adjusting bolt

────────────────────────────────────────────────── ─── 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-shi 4415-2 in Tokyo R & D Co., Ltd. (72) Inventor Nobuto Onuma 4415-2 in Shin-Yoshida-cho, Kohoku-ku, Yokohama-shi, Kanagawa Prefecture In-72 Tokyo R & D Co., Ltd. (72) Yoshiyuki Sakashita Kohoku, Yokohama-shi, Kanagawa Prefecture 4415-2, Shinyoshida-cho, Tokyo Inside Tokyo R & D Corporation (56) References JP-A-63-275427 (JP, A) JP-A-6-178832 (JP, A) JP-A-3-31029 (JP, A A) JP-A-2-120198 (JP, A) JP-A 54-24005 (JP, U) JP-A 62-139814 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) ) B60K 7 / 00 H02K 29/00 H02K 29/14 B62M 7/12

Claims (1)

(57) [Claims] 1. A back yoke is mounted on a wheel disk, a permanent magnet piece is mounted on an inner peripheral surface thereof 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. A stator is combined with a permanent magnet piece of the rotor with a narrow gap therebetween, and the outer rotor type motor is mounted on wheels to constitute a direct drive device. It has a hollow structure that opens in the direction, and its inner diameter is formed large, an encoder that monitors the rotation of the motor is installed in the hollow part of the cone, and the adjuster plate can adjust the rotation angle freely on the motor outer cover. Attached, the encoder shaft and the adjuster plate are connected by a coupling shaft. A wheel motor characterized by the above-mentioned.