KR100408081B1 - Driving Unit for two speed motor scooter - Google Patents

Abstract

The present invention relates to an electric scooter for driving by transmitting the driving force of the motor 2 to the drive wheels 1: a ring gear 11, a sun gear 12, a planet gear 13, and a carrier 14. A primary planetary gear reduction unit receiving rotational force from (2); An internal gear 15 engaged with the sun gear 12 of the primary planetary gear reduction unit to rotate; A secondary planetary gear reduction unit composed of a ring gear 21, a sun gear 22, a planet gear 23, and a carrier 24 and receiving rotational force from the primary planetary gear reduction unit; And a speed change control unit configured to receive the sun gear 22 so as to be slidable and to reciprocate the sun gear 22 by an operating force through the shift fork 34.

Accordingly, unlike the conventional single reduction ratio type driving device, the low speed / high speed two-speed is possible, thereby improving the climbing capacity and the maximum driving speed of the scooter.

Description

Driving device for two speed motor scooter {Driving Unit for two speed motor scooter}

The present invention relates to a driving apparatus of a two-speed electric scooter, and more specifically, unlike a general single reduction gear type driving apparatus, it is possible to improve the climbing capacity and the maximum driving speed of a scooter by enabling two-speed shifting at a low speed / high speed. It relates to a drive of a two-speed electric scooter capable of.

The driving unit of the conventional electric scooter is composed of a motor and a power transmission unit having a single reduction ratio. In this case, deceleration is generally performed by a timing belt between the motor and the wheel axle, and some products decelerate using a gear first, and then decelerate using a second timing belt.

However, the conventional products as described above have a single reduction ratio, so when driving downhill hills, the driving force of the rear wheels is insufficient, and driving is often impossible. The speed changes over a large range.

As a result, the driving time in an area outside the rotation speed range that can achieve the maximum efficiency of the motor becomes longer, resulting in a large heat generation in the motor, high battery consumption, which makes it difficult to expect high power efficiency, and performance deterioration due to the overload of the motor. And drawbacks resulting in reduced lifespan.

Therefore, an object of the present invention is to solve the above problems, unlike the conventional single reduction ratio type driving device to enable a two-speed of the low speed / high speed to improve the climbing capacity and the maximum driving speed of the scooter 2 To provide a driving device of the speed electric scooter.

1 is a block diagram showing the main part of the device according to the invention in a neutral state,

2 is a configuration diagram showing the main part of the apparatus according to the present invention at high speed;

3 is a configuration diagram showing the main part of the apparatus according to the present invention in a low speed state,

4 and 5 are schematic diagrams for explaining the operation of Figs. 2 and 3, respectively.

Explanation of symbols on the main parts of the drawings

11, 21: ring gear 12, 22: sun gear

13, 23: Planetary gear 14, 24: Carrier

15: internal gear 31: shifting shaft

32: Slider 34: Shift Fork

40: brake unit

In order to achieve the above object, the present invention provides an electric scooter for driving by transmitting the driving force of the motor 2 to the driving wheel 1: a ring gear 11, a sun gear 12, a planet gear 13, and a carrier 14. A primary planetary gear reduction unit configured to receive a rotational force from the motor 2; An internal gear 15 engaged with the sun gear 12 of the primary planetary gear reduction unit to rotate; A secondary planetary gear reduction unit composed of a ring gear 21, a sun gear 22, a planet gear 23, and a carrier 24 and receiving rotational force from the primary planetary gear reduction unit; And a gear shift control unit for slidably accommodating the sun gear 22 and reciprocating the sun gear 22 by an operating force through the shift fork 34, wherein the primary planetary gear reduction unit is a frame. A ring gear (11) fixed to (4), a sun gear (12) connected to the shaft of the motor (2), a planet gear (13) meshing with the ring gear (11) and the sun gear (12), And a carrier gear 14 having an internal tooth shape 14a while integrally supporting the planet gear 13, wherein the secondary planetary gear reduction portion is a ring gear 21 connected to the drive wheel 1; (14) or the sun gear 22 selectively engaged with the inner gear 15, the planet gear 23 meshing with the ring gear 21 and the sun gear 22, and the planet gear 23 integrally It consists of a carrier 14 fixed to the frame 4 while supporting, wherein the sun gear 22 is an internal tooth type 14a of the carrier 14 or the inner gear 15. ) 15a is provided with a shifting gear type 22a that is selectively engaged.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

1 is a block diagram showing the main part of the device according to the present invention in a neutral state.

The present invention relates to an electric scooter that travels by transmitting the driving force of the motor 2 to the drive wheels 1, and includes ring gears 11, 21, sun gears 12, 22, and planet gears 13 of the same standard. (23), the primary planetary gear reduction unit and the secondary planetary gear reduction unit constituted of the carriers 14 and 24 are provided on the input and output sides, respectively. That is, when the rotational force from the motor 2 is transmitted to the driving wheel 1 via the primary planetary gear reduction unit and the secondary planetary gear reduction unit, driving of the scooter is possible.

The primary planetary gear reduction unit is fitted with a ring gear 11 fixed to the frame 4, a sun gear 12 connected to the shaft of the motor 2, the ring gear 11 and the sun gear 12. Physics consists of a planet gear 13 and a carrier 14 having an internal tooth shape 14a while integrally supporting the planet gear 13. The sun gear 12 is circumscribed with the planet gear 13, and the planet gear 13 is inscribed with the ring gear 11 in a fixed state. The planet gear 13 rotates and rotates between the ring gear 11 and the sun gear 12.

The secondary planetary gear reduction unit has a ring gear 21 connected to the drive wheel 1, a sun gear 22 selectively engaged with the carrier 14 or the inner gear 15, the ring gear 21 and The planet gear 23 meshes with the sun gear 22 and the carrier 14 fixed to the frame 4 while integrally supporting the planet gear 23. The sun gear 22 meshes with the planet gear 23 mounted using the carrier pin, and the ring gear 21 is inscribed with the planet gear 23 while being supported by ball bearings at both ends and bolted with the driving wheel 1. Is fastened.

While the ring gear 21 of the primary planetary gear reduction unit is fixed and the decelerated rotational power is output through the carrier 14, the secondary planetary gear reduction unit is fixed to the carrier 24 and the sun gear 22 The power input through the ring gear 21 and the driving wheel 1 is output. The input of the secondary planetary gear reduction unit is configured to be shifted by being selected by the driver's operation.

In addition, according to the present invention, the inner gear 15 which rotates in engagement with the sun gear 12 of the primary planetary gear reduction unit is provided. The inner gear 15 is rotatably received inside the carrier 14 and is always engaged with the sun gear 12 coupled to the motor shaft 3 to rotate integrally. Each internal tooth type | mold 14a, 15a has the same specification of pitch, pitch circle diameter, a module, and the like.

In addition, according to the present invention, the sun gear 22 is accommodated so as to be slidable, and a shift operation part for reciprocating the sun gear 22 by an operating force through the shift fork 34 is provided. The sun gear 22 is integrally fixed on the transmission shaft 31. The shift fork 34 is mounted on the frame 24 via a pin 36 at a state supported by a spring 35. In the illustration, the lower end of the shift fork 34 is connected to a slider 32 mounted to the shift shaft 31 via a bushing bearing. The slider 32 restricts only the position in the horizontal direction while allowing the rotational movement of the transmission shaft 31 which rotates integrally with the sun gear 22.

At this time, the return spring 33 supporting the sun gear 22 does not exactly match the angle of engagement of the teeth of the sun gear 22 and the inner gear 14a when the driver forcibly pulls the lever. When gear teeth are engaged, the parts may be damaged, so that excessive force generated when the sun gear 22 and the inner gear 14a are coupled may be absorbed through the deformation of the return spring 33. In this case, the gear shift lever on the driver's side is pulled, but the sun gear 22 is driven by the force of the return spring 33, which is compressed after the drive wheel 1 or the motor 2 is finely rotated without actually shifting. Pushed into).

In the figure, the left end of the shift fork 34 is connected to the shift lever (not shown) installed on the handle of the scooter by wire and interlocked.

In the second speed electric scooter according to the present invention, the motor power transmitted to the sun gear 12 of the primary planetary gear reduction unit is transferred to the secondary planetary gear reduction unit, and the carrier 14 of the primary planetary gear reduction unit is selected at a low speed. The output through is selected, and at high speed the output through the inner gear 15 accommodated in the carrier 14 is selected.

At this time, the sun gear 22 is provided with a shift tooth mold 22a which is selectively engaged with the inner tooth molds 14a and 15a of the carrier 14 or the inner gear 15. Therefore, as described above, the specifications of the internal teeth 14a and 15a must match. Accordingly, the speed varies depending on whether the gear tooth 22a of the sun gear 22 meshes with the inner tooth mold 14a of the carrier 14 or the inner tooth mold 15a of the inner gear 15. It is also possible to process and form the above-mentioned gear tooth 22a on the sun gear 22, or it may be possible to form a separate tooth and then to assemble it integrally by pressing.

As shown in Fig. 1, when the driver operates the shift lever to keep the shift fork 34 horizontal, the sun gear 22 of the secondary planetary gear reduction unit is pushed outward and the shifting gear type 22a is the carrier of the primary planetary gear reduction unit. Engagement with both the 14 and the internal gear 15 is released and a free state is transmitted without any power. This is a neutral state in which the scooter can be moved freely by the driver's feet. If there is no battery power, it is left in this state for driving downhill slopes or for exercise.

As the driver pulls the shift lever to raise or lower the shift fork 34, the sun gear 22 is moved from the neutral state to the left and right sides, so that the shift tooth type 22a of the sun gear 22 is the carrier 14 of the primary planetary gear reduction unit. Or the gear ratio is engaged with one of the inner gear 15 and the reduced motor power is transmitted to the driving wheel.

On the other hand, the brake unit 40 is configured to contact the ring gear 21 of the secondary planetary gear reduction unit.

Figure 2 is a block diagram showing the main portion of the device according to the invention at high speed, Figure 3 is a block diagram showing the main portion of the device according to the invention at a low speed state, Figures 4 and 5 are FIGS. It is a schematic diagram for explaining the operation of 3.

When the shifting fork 34 is normally configured to be lowered by the return spring 33 as shown in FIG. 2, when the driver releases the shifting lever to the maximum, the shifting fork 34 is pressed by the return spring 33 to move the slider 32 to the motor. Pushed to the side. Accordingly, when the sun gear 22 is pushed to the motor side and the shift tooth type 22a is engaged with the internal tooth type 15a of the inner gear 15, the motor power is transmitted to the sun gear 22 of the secondary planetary gear reduction unit as it is. Subsequently, deceleration is performed by the planet gear 23, and then power is transmitted to the driving wheel 1 through the ring gear 21. In this case, since the rotational power of the motor does not go through deceleration in the primary planetary gear reduction unit, the scooter can be driven relatively fast. Referring to Figure 4 it can be seen more clearly the power transmission path in the high-speed driving state.

When the driver moves the shift lever in one step, as shown in FIG. 1, the shift fork 34 is horizontal and the sun gear 22 is pushed to the opposite side (left side) of the motor while engaged with the primary planetary gear reduction unit. Free state. In this state, since there is no power transmitted to the sun gear 22 of the secondary planetary gear reduction part, it is in a neutral state.

When the driver moves the shift lever in two steps, the shift fork 34 is raised as shown in FIG. 3 and the shift tooth type 22a of the sun gear 22 is the internal tooth type 14a of the carrier 14 at the primary planetary gear reduction portion. Is matched with When the rotational power of the motor is transmitted from the sun gear 12 of the primary planetary gear reduction unit to the planet gear 13, the planet gear 13 performs an orbiting motion. Power decelerated by the path through the carrier pin, which is the central axis of the planet gear 13, is transmitted to the sun gear 22, the planet gear 23, and the ring gear 21, and the second deceleration is performed again. Is delivered). In this case, since the deceleration is performed twice by the primary planetary gear reduction unit and the secondary planetary gear reduction unit, the scooter travels at a relatively low speed. Referring to Figure 5 it can be seen more clearly the power transmission path in the low-speed driving state.

On the other hand, the connection of the shift lever and the shift fork 34 may be configured as described above. That is, it is possible to change the state of neutral and high speed one by one each time the shift lever is pulled by one step at normal low speed.

Such a drive device including the transmission mechanism of the present invention can be applied to other transport devices such as a wheelchair as well as a scooter.

According to the above configuration and operation, the present invention enables a low-speed and high-speed two speed shift reducer to be installed inside the rear wheel of the electric scooter, so that the driving of an uphill slope that was not possible to travel with a conventional single reduction ratio electric scooter.

In addition, it is possible to obtain a high top speed has the effect of enjoying a more sporty driving.

In addition, the load applied to the motor under various road conditions can be adjusted in two stages through the reducer so that the motor can be operated in a high-efficiency rotation range, resulting in high heat efficiency and reduced power consumption. Can be.

It is apparent to those skilled in the art that the present invention is not limited to the described embodiments, and that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, such modifications or variations will have to belong to the claims of the present invention.

Claims (4)

In an electric scooter that travels by transmitting the driving force of the motor 2 to the driving wheel 1: A primary planetary gear reduction unit composed of a ring gear 11, a sun gear 12, a planet gear 13, and a carrier 14 and receiving rotational force from the motor 2; An internal gear 15 engaged with the sun gear 12 of the primary planetary gear reduction unit to rotate; A secondary planetary gear reduction unit composed of a ring gear 21, a sun gear 22, a planet gear 23, and a carrier 24 and receiving rotational force from the primary planetary gear reduction unit; And It is made to include a gear shifting operation for accommodating the sun gear 22 to be slidable, and reciprocating the sun gear 22 by the operating force through the shift fork 34, Here, the primary planetary gear reduction portion has a ring gear 11 fixed to the frame 4, a sun gear 12 connected to the shaft of the motor 2, the ring gear 11 and the sun gear 12 ) And a carrier (14) having an internal tooth shape (14a) while integrally supporting the planet gear (13), The secondary planetary gear reduction unit has a ring gear 21 connected to the drive wheel 1, a sun gear 22 selectively engaged with the carrier 14 or the inner gear 15, the ring gear 21 and A planet gear 23 engaged with the sun gear 22 and a carrier 14 fixed to the frame 4 while integrally supporting the planet gear 23; The sun gear (22) is a drive device for a two-speed electric scooter, characterized in that it comprises a gearshift (22a) which is selectively engaged with the internal teeth (14a) (15a) of the carrier (14) or the inner gear (15). delete delete delete