JPH0331029A - Motor-driven vehicle - Google Patents

Abstract

PURPOSE:To make a motor driven vehicle having direct drive wheels as drive wheels, compact, by disposing a direct drive motor outside of an upright to which a suspension arm is coupled, and by disposing a brake mechanism outside thereof. CONSTITUTION:A rotor bracket 8 of a direct drive motor 3 is secured, by blots 19, to the inside of a wheel drive disc 7 constituting a wheel 5 together with a rim 12 attached thereon with a tire 11, and a rotor 14 composed of permanent magnets arranged around the outer periphery of a stator 13 of the motor 3 is supported to the roller bracket 8 and a bracket 15 in opposite to the latter. Further, a rotary shaft 6 which is coupled to the wheel 5 at the center position thereof, is arranged piercing through a hollow part of an upright 2 connected thereto with a suspension arm 1, an is projected therefrom with its end part which is coupled to a brake drum 18 of a brake mechanism 4 disposed inside of the upright 2. Further, brake lining disc 23 is secured by bolts 19 inside of the upright 2.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to an electric vehicle having a direct drive wheel as a driving wheel, more specifically an electric four-wheel vehicle. A direct drive wheel incorporating the stator and rotor of an electric motor, which is a driving power source, is disclosed in, for example, Japanese Utility Model Application Laid-Open No. 62-139814. Research and development is progressing on two-, three-, and four-wheel electric vehicles that use these direct drive wheels as drive wheels, and some have been successfully implemented.

Said Utsukai Showa 62. - As illustrated in FIG. 4, the direct drive wheel described in Publication No. 139814 has a brake mechanism located adjacent to the outside of an upright (knuckle) b to which suspension arms a and a are connected for independent suspension. A brake disc C is arranged, and a wheel e incorporating a direct drive motor d is further arranged outside the brake disc C, and the wheel e and the brake disc C are directly connected.

Such a structure can be said to be modeled after the structure of conventional vehicles that have a prime mover (engine or electric motor) independent of the wheels inside the vehicle body. This is probably due to the fact that such a structure is reasonable for the arrangement of rotating parts and there is no problem in terms of ensuring strength.

Problems to be Solved by the Invention In the case of an electric vehicle that uses a direct drive wheel with a direct drive motor built into the wheel as a driving wheel, the volume (bulk) of the direct drive motor increases as performance and output are improved. increases. Therefore, in the arrangement of the conventional structure described above, the distance 191 between the connection point of the suspension arm a to the upright) b and the center of the tire f, which is the final point of application of the vehicle weight, is increased, thus supporting the rotating part. A large moment will be generated in the structure. For this reason, not only is there a significant disadvantage in terms of the strength of each component, but in the case of steering wheels, input from the road surface (support reaction force) generates a large moment, making it extremely difficult to ensure steering stability. These are issues that need to be solved.

Means for Solving the Problems As a means for solving the problems of the prior art described above, an electric vehicle according to the present invention drives a direct drive wheel, as shown in an embodiment in FIGS. 1 to 53 of the drawings. In a wheeled electric vehicle, a direct drive motor 3 is placed at an outside position of an upright 2 to which a suspension arm l is connected, and a brake mechanism 4 is placed at an inside position. The direct drive motor 3 and the brake alui, 4 are connected via a rotating shaft 6 that passes through the upright 2 on the central axis of the wheel 5, making it possible to transmit rotational force and braking force. It is characterized by having direct drive wheels.

Operation The upright 2 is brought closer to the direct drive motor 3 by the amount that the brake mechanism 4 (brake drum 18, brake disk 23) is arranged inside the upright 2. Therefore, the distance from the connection point of the suspension arm l to the upright 2 to the center of the tire 11 is reduced, and the generated moment is also reduced.

Example The illustrated invention will now be described in detail.

As is clear from FIG. 1, the wheel 5 is composed of a rim 12 to which a tire 11 is attached and a wheel disc 7. The rotor bracket 8 of the direct drive motor 3 is fixedly attached to the inside of the wheel disc 7 with several ports 9 and cap nuts 10. A rotor (field) made of permanent magnets placed around the outer periphery of the stator 13 of the direct drive motor 3! 4 is supported by the rotor bracket 8 and the opposite bracket 15.

A rotating shaft 6 whose one end is connected to the center of the rotor bracket 8 through a spline 16 is arranged on the central axis of the wheel 5 . The rotating shaft 6 is disposed so as to pass through the hollow portion of the stator 13 and the hollow portion of the upright 2 disposed adjacent to the direct drive motor 3, respectively. A brake drum 18 of a brake mechanism 4 disposed inside the upright 2 is integrally connected to the left end of the rotating shaft 6 protruding from the hollow portion of the upright 2 by a spline 17. Therefore, the wheel 5, the rotating portion of the direct drive motor 3, and the brake drum 18 are in an integral relationship such that rotational force and braking force are transmitted via the rotating shaft 6.

The upright 2 and the stator 13 of the direct drive motor 3 are integrally connected by several ports 19. The rotating shaft 6 is rotated by bearings 20 and 21 installed in the hollow part of the stator 13 and the hollow part of the upright 2.
is rotatably supported at both ends. A bearing 22 is also installed between the inner circumference of the bracket 15 and the outer circumference of the stator 13.

A brake lining disc 23 of the brake mechanism 4 is fixedly attached to the inside of the upright 2 by the port 19.

The direct drive wheel configured as described above is attached to the body of a vehicle in an independent suspension manner by several suspension arms 1 connected to an upright 2.

Reference numeral 24 in FIG. 3 is a brake rod, and 25 is a suspension device.

The effects of the present invention have been described in detail in conjunction with the embodiments, and according to the electric vehicle according to the present invention, a relatively large direct drive wheel (
Even if a direct drive motor 3) is adopted,
Since the distance gI from the connection point of the suspension arm l to the upright 2 to the center of the tire 11 is not very large (it is kept at the same level as a conventional vehicle), the moment generated due to the distance is also small. Therefore, it is extremely useful for ensuring the strength of each part. That is, sufficient strength can be ensured even if the parts are lightweight and small, and furthermore, due to the weight reduction, rotational resistance is also achieved by downsizing the bearings, etc., and the output load is significantly reduced.

Furthermore, as a result of the reduction of the interval, even when the direct drive wheel described above is used as a steering wheel, a large moment will not be generated due to input from the road surface, so that the relatively large direct drive motor 3 By incorporating this, it is possible to achieve higher performance and higher output.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an embodiment of the direct drive wheel adopted by the electric vehicle of the present invention, and Fig. FIG. 4 is a perspective view of the state in which this is done, and a sectional view showing an example of a conventional direct drive wheel. l... Suspension arm 2... Upright 3... Direct drive motor 4... Brake mechanism 5... Wheel 6
···Axis of rotation

Claims (1)

[Claims] [1] In an electric vehicle that uses direct drive wheels as driving wheels, a direct drive motor is disposed at an outer position of an upright to which a suspension arm is connected, and a brake mechanism is disposed at an inner position. , the direct drive wheel is configured such that the direct drive motor and the brake mechanism are coupled via a rotating shaft passing through an upright on the central axis of the wheel, thereby enabling transmission of rotational force. An electric vehicle.