JPH07125671A - Small electric motor car - Google Patents

Abstract

PURPOSE:To provide an excellent cushioning function by fixing one end side of a plate spring of a suspension mechanism on a body frame, making the other end side as a free end free to change its position and making the plate spring support a rear wheel axle shaft unit. CONSTITUTION:An arched plate spring 9 protrusively curved downward is arranged along the longitudinal direction respectively separately on left and right sides of a body frame 3 in a suspension mechanism. Its one end (front end) 9a is pivotally supported on an installation part 3a of the body frame 3 free to revolve around a horizontal shaft center X. The other end (rear end) 9b of the plate spring 9 is supported on a slotted hole 3b in the longitudinal direction provided on the rear part of the body frame 3 free to change its position in the longitudinal direction in accordance with deformation of the plate spring 9. It is possible to cushion an impact applied on a rear wheel axle shaft unit A by fixing and supporting the rear wheel axle shaft unit A on the plate spring 9 by a U bolt 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small electric vehicle mainly used by people who have difficulty walking or elderly people, and more specifically, a small electric vehicle in which a rear wheel axle unit is supported by a body frame via a suspension mechanism. Regarding cars

[0002]

2. Description of the Related Art Conventionally, as such a small electric vehicle, for example, as disclosed in Japanese Patent Laid-Open No. 5-8782,
A pair of left and right fuselage frames that extend along the lower part of the vehicle body are bent and formed so as to bypass the rear wheel axle unit, and are pivotally supported around the center of the horizontal axis in the vicinity of the start-up part. The rear wheel axle unit is supported through a pair of left and right swing arms, and a suspension mechanism composed of a coil spring and a rod supporting the coil spring is interposed between each swing arm and the body frame, and In some cases, the rear wheel axle unit is configured to be capable of relative vertical movement while having a cushioning function.

[0003]

However, according to the conventional small-sized electric vehicle described above, a mounting structure for swingably mounting the swing arm on the machine frame must be formed.
Since a large number of manufacturing parts are required to form the suspension mechanism, the material cost is high and the manufacturing process is complicated, so that the manufacturing cost is high as a whole and the small electric vehicle itself is expensive. First of all, there was a desire for a cheaper, smaller electric vehicle.

An object of the present invention is to provide a small-sized electric vehicle that is inexpensively manufactured with a suspension mechanism having a simple structure.

[0005]

To achieve the above object, the present invention is characterized in that a suspension mechanism has one end of a leaf spring fixed to a body frame and the other end of which is a freely repositionable free end. , The rear wheel axle unit is supported by the leaf spring, and its action and
The effects are as follows.

[0006]

According to the above construction, since the suspension mechanism is constructed with a simple mounting structure in which the leaf spring is supported on the machine body frame, the number of parts for manufacturing the suspension is reduced, and the leaf spring is used to reduce the cost. ,
Moreover, the manufacturing process is simplified.

Further, since the leaf spring has one end fixed and the other end being a free end whose position is freely changeable, even if the rear wheel axle unit supported by the leaf spring is impacted,
The leaf spring deforms while changing the position of the free end, can absorb the impact, and exhibits a sufficient cushioning function.

[0008]

According to the present invention, since the suspension mechanism can be manufactured at low cost, it is possible to provide a small electric vehicle that can exhibit the desired cushioning function and can be manufactured at low cost as a whole. We were able to.

Further, if such a suspension mechanism is adopted, it is possible to separately provide suspensions to the left and right of the rear wheel, and by providing suspensions to the left and right respectively,
The rear wheel axle can not only move up and down as a whole, but it can also move up and down while inclining, and can appropriately respond to various impacts on the rear wheel axle unit,
There is an advantage that it can be configured to be excellent in terms of cushioning performance.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the small electric vehicle of the present invention includes a steering wheel 1 and a riding seat 2, and a vehicle body 4 supported by a body frame 3 and a steerable body 4 around the longitudinal axis P. One front wheel 5 and two driving rear wheels 6 are capable of traveling.

A battery 7, various control devices 8 and the like are arranged in the vehicle body space below the boarding seat 2, and the rear wheel axle unit A is mounted on the body frame 3 via a suspension mechanism.
It is attached to. The rear wheel axle unit A is configured by integrating an electric motor 11 and a mission 12 having a diff mechanism incorporated therein, and attaching drive rear wheels 6, 6 to rear axles 13, 13 extending left and right from the mission 12. I am doing it.

In the suspension mechanism, as shown in FIG. 2, bow-shaped leaf springs 9 which are convexly bent downward are arranged on the left and right sides of the body frame 3 separately along the front-rear direction.
One end (front end) 9a thereof is pivotally supported on the mounting portion 3a of the machine body frame 3 so as to be rotatable about the horizontal axis X, and the leaf spring 9 is provided in a longitudinal hole 3b provided in the rear portion of the machine body frame 3. The other end (rear end) 9b of the rear wheel axle 9 is supported so that the position thereof can be changed in the front-rear direction according to the deformation of the leaf spring 9, and the rear wheel axle unit A is fixed to the leaf spring 9 with a U-shaped bolt 10. By supporting it, the impact applied to the rear wheel axle unit A can be buffered.

[Other Embodiments] The suspension mechanism may be modified and implemented as follows.

<1> That is, as shown in FIG. 3, one end (front end) 19a of the bow-shaped leaf spring 19 is connected to the machine body frame 3.
Of the leaf spring 19 is slidably contacted with the machine body frame 3 from below along with the deformation of the leaf spring 19 to change the position in the front-back direction. Even if the rear wheel axle unit A is fixedly supported by the leaf spring 19 by the U-shaped bolt 10 so as to be able to buffer the shock applied to the rear wheel axle unit A, the rear wheel axle unit A is freely supported. Of course, if it does in this way, it will become possible to manufacture more cheaply than the above-mentioned Example. <2> As shown in FIG. 4, a cam member 14 is provided at a sliding contact position between the leaf spring 19 and the machine body frame 3, and a bolt 15 is continuously provided on the cam member 14 to move the cam member 14 back and forth. The plate spring 19 may be formed so that its position can be changed in any direction. In this case, the length from the fixed end (front end) 19a of the plate spring 19 to the sliding contact position can be changed, and the plate spring 19 can be changed. Since the spring strength can be adjusted,
There is an advantage that the spring strength can be set to an appropriate level for comfortable riding in accordance with the weight of the occupant, and the user can use it more comfortably.

<3> Further, as shown in FIG. 5, one end (front end) 29a of an L-shaped plate spring 29 is cantileveredly fixed to the machine body frame 3 by bolts, and the free end 29 of the plate spring 29 is fixed.
The rear wheel axle unit A may be fixedly supported by the U-shaped bolt 10 on the b side so that the shock applied to the rear wheel axle unit A can be buffered. It is possible to provide a structural suspension mechanism that is simpler than that of the other embodiment <1>, and it is possible to provide a small electric vehicle at a lower cost.

Further, also in the configurations of the suspensions shown in the above embodiments and other embodiments <1> and <2>, the structure for fixing the leaf springs 9 and 19 to the three mounting portions 3a of the machine body frame has a horizontal axis. It does not have to be rotatable around X, and may simply be bolted. Alternatively, the fixed ends of the leaf springs 9, 19, 29 may be set to the leaf spring rear end.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is an overall side view of a small electric vehicle according to the present invention.

FIG. 2 is a side view of the suspension mechanism.

FIG. 3 is a side view showing another embodiment <1> of the suspension mechanism.

FIG. 4 is a side view showing another embodiment <2> of the suspension mechanism.

FIG. 5 is a side view showing another embodiment <3> of the suspension mechanism.

[Explanation of symbols]

 3 Airframe frame 9,19,29 Leaf springs 9a, 19a, 29a One end 9b, 19b, 29b The other end A Rear wheel axle unit

Claims (1)

[Claims] 1. A small electric vehicle in which a rear wheel axle unit (A) is supported on a body frame (3) through a suspension mechanism, wherein the suspension mechanism includes leaf springs (9), (19). , (29) one end (9a), (19a),
The (29a) side is fixed to the machine body frame (3) and the other ends (9b), (19b) and (29b) are set as free ends, and the leaf springs (9), (19), ( 29)
A small electric vehicle having the rear wheel axle unit (A) supported on the rear wheel axle unit.