JPH05278476A - Wheel motor for electric vehicle - Google Patents

Abstract

PURPOSE:To downsize the constitution of a wheel motor with a brake in the axial direction in particular. CONSTITUTION:A part of a motor 14 is formed with a drum section 26. A drum brake is disposed therein wherein the drum brake is made up of a knuckle section 22 integrated with an axle acting as a brake cylinder, a wheel cylinder 28, a shoe 31, and of a lining 34. Despite of the provision of the drum brake, the axial length of the motor 14 of a wheel motor can be downsized. By this constitution, loading capacity can thereby be enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel motor for an electric vehicle, and more particularly to improvement of a brake structure.

[0002]

2. Description of the Related Art An electric vehicle is a vehicle that runs using a motor as a drive source. There are various types of electric vehicles, and for example, a structure in which a motor is provided for each wheel is known. As such a structure, there is a so-called wheel motor, that is, a motor in which a motor is arranged inside a wheel. Japanese Patent Laid-Open No. 2-120198 discloses that
A wheel motor provided with a drum brake is shown as an example.

FIG. 2 shows the configuration of the wheel motor according to this publication. In this conventional example, a motor 42 is arranged inside the wheel 40, and a drum brake 44 is combined with the motor 42.

[0004]

However, if the brake is added to the wheel motor as it is, the size of the wheel motor in the axial direction is increased by the amount of the brake provided, which is not preferable in terms of mountability.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a wheel motor which is more excellent in mountability.

[0006]

In order to achieve such an object, a wheel motor for an electric vehicle according to the present invention has a substantially drum-shaped portion formed in a part of a rotor, and an inner portion of the drum-shaped portion. It is characterized in that it is provided with a braking member which is abutted from.

[0007]

In the wheel motor of the present invention, the braking member is brought into contact with the drum-shaped portion formed on a part of the rotor from the inside. Therefore, as a result of disposing the braking member inside the rotor, the dimension of the wheel motor in the axial direction is reduced, and the mountability is improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of a wheel motor for an electric vehicle according to an embodiment of the present invention. The wheel motor shown in this figure includes a stator 12 fixed to the housing 10 and a rotor 14 arranged inside the stator 12. The stator 12 has a structure in which silicon steel plates and the like are laminated, and a winding 16 is wound around the stator 12. When a current flows through the winding 16, a magnetic field generated by this current links the rotor 14 and the rotor 14 rotates.

The rotor 14 is connected to a wheel 18. A tire 20 is fitted to the wheel 18,
Therefore, when the rotor 14 rotates, the wheel 18 and thus the tire 20 rotate, which serves as driving force for the vehicle.

In this embodiment, an axle-integrated knuckle 22 is arranged inside the rotor 14 via a bearing. Although not shown in the drawings,
A piston that operates by hydraulic pressure or the like is housed, and by changing the hydraulic pressure or the like applied to this piston, the member 24 provided at the tip end thereof via a bearing moves as indicated by the arrow in the figure. Then, this member 24
The magnetic body 25 connected to one end of the slider slides on the spline, and the magnetic coupling between the stator 12 and the rotor 14 changes. As a result, the output torque of the motor of this embodiment can be variably controlled.

A feature of this embodiment is that a part of the rotor 14 is used and a drum brake is constructed by using this as a brake drum. That is, the rotor 14
A drum portion 26 is formed at one end of the drum portion 26, and a drum brake having the structure shown in FIG. 1B is formed inside the drum portion 26.

FIG. 1B is a sectional view taken along the line AA of the structure shown in FIG. 1 (a) and (b),
Reference numeral 28 denotes a wheel cylinder, and hydraulic pressure is supplied to the wheel cylinder 28 from a brake master cylinder (not shown) via a passage 30. A shoe assembly including a shoe 31 and a lining 34 is connected to the wheel cylinder 28, and when hydraulic pressure is applied to the wheel cylinder 28, the lining 34 abuts on the inner surface of the drum portion 26, whereby the rotor 14 is braked. To be done. In this way, the service brake is realized in this embodiment. The rotor 14 is made of the magnetic material 2
Since the sliding of No. 5 requires a margin as shown by the chain line in the drawing, the dimensional increase due to the formation of the drum portion 26 does not occur.

Further, in this embodiment, the parking brake is realized by the lever 36 and the anchor 38.
The anchor 38 is disposed below when viewed from the wheel cylinder 28, and has a slightly divergent shape. When this anchor 38 is rotated by the lever 36 shown by the broken line in FIG.
Pressure is applied to 1. In this embodiment, the parking brake is constructed in this way.

Therefore, in this embodiment, the axial dimension is reduced as compared with the conventional wheel motor. This is because the drum portion 26 is formed in a part of the rotor 14, and the drum portion 26 is used as a brake drum to form a drum brake. Moreover, since the weight is reduced, the maneuverability is also improved. Furthermore, in the present embodiment, the effect of varying the torque described above can also be obtained.

In addition, the drum portion 2 is activated by the operation of the brake.
Since 6 is distorted, the gap between the stator 12 and the rotor 14 becomes smaller, resulting in an increase in magnetic coupling and an increase in regenerative torque. As a result, the effect of regenerative braking is increased.

Further, if the regenerative brake is mainly used and the drum brake of this embodiment is used in an emergency, the shoe 31 need not be replaced so much.

[0018]

As described above, according to the present invention,
Since a part of the rotor has a drum shape and the braking member is provided inside this portion, the dimension of the wheel motor in the axial direction can be reduced and the mountability can be improved even though the brake is provided.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a wheel motor for an electric vehicle according to an embodiment of the present invention, FIG. 1 (a) is a schematic sectional view, and FIG. 1 (b) is an AA sectional view.

FIG. 2 is a sectional view showing a configuration of a wheel motor for an electric vehicle according to a conventional example.

[Explanation of symbols]

 10 Housing 12 Stator 14 Rotor 16 Winding 18 Wheel 20 Tire 22 Axle Knuckle 26 Drum 28 Wheel Cylinder 31 Shoe 34 Lining 36 Lever 38 Anchor

Claims (1)

[Claims] 1. A wheel motor for an electric vehicle, comprising: a stator arranged inside a wheel of an electric vehicle; and a rotor arranged inside the stator to rotate the wheel by the rotation thereof. The wheel motor for an electric vehicle is provided with a braking member that is formed on the drum-shaped portion and abuts against the drum-shaped portion from the inside.