KR200175594Y1 - Transmission device for portable mini scooter - Google Patents

Abstract

The present invention relates to a power transmission device of a portable mini scooter, the main purpose of the present invention is to be transmitted to the drive wheel by the driven side and the drive side pulley and belt with a small diameter difference so that the rotational force of the engine is properly decelerated through the gearbox By reducing the noise and vibration generated during driving, the power transmission means is not easily peeled off or damaged.

When the rotational force of the high speed low torque of the engine is transmitted to the gearbox through the centrifugal clutch, the constitutional means for achieving the present invention is appropriately decelerated by the reduction gear train in the gearbox so that the power of the low speed high torque is output by the driving pulley, Then, the driving force of the driving pulley is transmitted to the driven pulley by the belt, characterized in that configured to drive the driving wheel.

Description

Power Train of Portable Mini Scooter

The present invention relates to a power transmission device of a portable mini scooter, and more particularly, it is configured so that the rotational force of the engine can be properly decelerated by the gear train in the gearbox to be transmitted to the driving wheel by the belt pulley and the belt, thereby smoothly transmitting power. It relates to a belt transmission power transmission device configured to be made.

In general, the portable mini scooter is a mini auto bike with a folding handle in a small size, easy to store and park, excellent fuel economy and driving performance has been widely used for leisure and sports or short-distance transportation.

The power transmission method of the conventional portable mini scooter will be described with reference to FIGS. 1A and 1B.

First, Figures 1a and 1b is a friction transmission power transmission device is shown, according to the power output from the crankshaft of the engine 10 is transmitted to the friction roller 60 through the centrifugal clutch 20, The friction roller 60 is configured to be in close contact with the tire trade portion of the driving wheel 50 so as to directly transmit the power of the engine 10 to the driving wheel 50.

The friction transmission type power transmission device has the advantage that the structure is simple and the manufacturing cost is low, but the tire of the driving wheel 50 is easily worn out by frictional contact with the roller 60 and the life of the tire is shortened. In addition, since the friction roller 60 is in intimate contact with the tire, foreign matter is caught in the contact portion between the tire and the friction roller 60 in a place where mud or the like is impossible to run, or the efficiency of power transmission is greatly reduced. Etc. There was a problem that the use restrictions.

Therefore, in order to solve such a problem, a chain transmission type power transmission device configured to transmit power of the engine 10 to the driving wheel 50 by a chain has been disclosed. In the chain transmission type power transmission device, as shown in FIGS. 1C and 1D, the power of the engine 10 is transmitted to the drive side sprocket wheel 71 through the centrifugal clutch 20, and then the chain 72. The power is transmitted to the driven sprocket wheel 73 integrally provided on one side of the drive wheel 50 by means of) so that the drive wheel 50 can be driven.

Therefore, in the chain transmission method, the engine power can be reduced and transmitted to the drive wheels 50 by a significant difference in the number of teeth of the drive sprocket wheel 71 and the driven sprocket wheel 73.

At this time, the traveling speed of the mini scooter is generally about 30Km / h, and since the commercial rotational speed of the engine 10 used in such a mini scooter is mainly used 5000 ~ 7500rpm, the appropriate driving speed to the engine 10 In order to bet, a reduction ratio of 1/12 to 1/13 was required.

At this time, since the number of teeth of the driving sprocket wheel 71 should be 6 or more, however small, the number of teeth of the driven side sprocket wheel 73 should be relatively 72 or more. Thus, the diameter of the 72 teeth driven sprocket wheel 73 is approximately equal to the diameter of the drive wheel 50.

Therefore, when the chain 72 is transferred between the sprocket wheels 71 and 73 on both sides having such a large difference in the number of teeth, power is transferred to the drive side sprocket wheel 71 having a relatively small number of teeth. Chain 72 vibrates up and down by a distance corresponding to L on the drawing, such as in the case of transmitting the power by winding the belt around the polygon, causing the noise, according to the chain 72 in the sprocket wheels 71 (73) There were inconveniences such as peeling off easily and refitting.

In addition, as described above, the sprocket wheel 73 on the driven side is substantially the same size as the driving wheel 50 and easily hits the protrusion on the ground, and one side of the sprocket wheel 73 is bent by the impact at this time. If the chain 72, the chain 72 is easily peeled off the sprocket wheel 73, or the chain transmission may be impossible.

Therefore, the present invention has been devised to solve such a conventional problem, and the main object of the present invention is to reduce the diameter of the driving side by appropriately reducing the rotational force of the high speed and low torque of the engine by a reduction gear train built in the gearbox. And by transmitting the belt to the driven pulley, thereby providing a power transmission device with low noise and vibration, and thus the power transmission means is not easily peeled off or damaged.

Figure 1a is a schematic diagram showing a power transmission device of a conventional friction transmission method,

Figure 1b is a side view showing a power transmission device of a conventional friction transmission method,

Figure 1c is a schematic diagram showing a power transmission device of the conventional chain transmission method,

Figure 1d is a side view showing a power transmission device of the conventional chain transmission method,

Figure 2a is a schematic diagram of a portable mini-scooter of the belt transmission method according to the present invention,

Figure 2b is a schematic diagram showing a power transmission device of the belt transmission method according to the present invention,

Figure 2c is a side view showing a power transmission device of the belt transmission method according to the present invention,

Figure 3a is a side cross-sectional view showing the internal structure of the gearbox according to the present invention,

3B is a cross-sectional view taken along the line A-A of FIG. 3A.

*** Explanation of symbols for the main parts of the drawing ***

1: frame 10: engine

20: centrifugal clutch 21: friction disk

23: friction cylinder 30: gearbox

31: input shaft 32: drive gear

33: bearing 34: intermediate gear

35: output shaft 36: driven gear

37: driving pulley 38, 39: housing

47: driven pulley 48: belt

50: driving wheel 51: shaft

53: bracket 60: friction roller

71: drive side sprocket wheel 72: chain

73: driven sprocket wheel 301: flange

33a: One Way Bearing

A constitutional means for achieving the object of the present invention, in the power transmission device for transmitting power to the drive wheel by providing a friction disk of the centrifugal clutch at the engine output end,

A friction cylinder of the centrifugal clutch is provided at the input shaft end, and a driving pulley is installed at the output shaft end, so that the rotational force of the input shaft can be transmitted to the output shaft at a predetermined reduction ratio, and a flange surface for installing the engine on the outer wall of the housing. A formed gearbox;

A drive pulley installed to rotate integrally on one side of the drive wheel and the driving pulley of the gearbox output shaft end is characterized in that it is configured to transmit power by a belt.

In addition, in the gearbox, the drive gear of the input shaft and the driven gear of the output shaft and the intermediate gear between the drive gear and the driven gear are engaged with each other so as to transmit the rotational force at a predetermined reduction ratio.

According to the above configuration, the rotational force of the high speed low torque of the engine is appropriately decelerated by the gear train in the gearbox through the centrifugal clutch to be the output of the low speed high torque, which is transmitted to the driving pulley, which is then transmitted to the driven pulley by the belt. The driving wheel can be driven.

Hereinafter, with reference to the accompanying drawings for a preferred embodiment of the present invention in detail as follows.

2A, 2B, and 2C are schematic and side views illustrating a belt transmission type power transmission device according to the present invention, wherein reference numeral 10 denotes an engine for generating power, and 20 denotes a gearbox for powering the engine 10. 30 is a centrifugal clutch for transmitting to the 30, 30 is a gearbox for properly decelerating and transmitting the rotational force transmitted by the centrifugal clutch 20, 47 is the power output from the driving pulley 37 of the gearbox The driven pulley is received, 50 is a drive wheel that rotates integrally with the driven pulley (47).

For the components having the same configuration and the same function as in the related art, such as the engine 10, the centrifugal clutch 20, and the driving wheel 50, the same reference numerals as in FIGS. I will.

The gearbox 30 is a device for outputting power appropriately decelerated by the gear trains 32, 34 and 36 received from the engine 10 by the centrifugal clutch 20. 3A and 3B, the input shaft 31, the output shaft 35, the reduction gear trains 32, 34, 36, etc. are built into the outer housing 38, 39, as shown in FIGS. 3A and 3B. It is installed if possible. At this time, the input shaft 31 is provided with a friction cylinder 23 of the centrifugal clutch at the shaft end thereof so as to receive the power of the engine, and in the center of the input shaft 31 by the key shaft 31 and A drive gear 32 is provided to rotate integrally.

The output shaft 35 is provided with a driving pulley 37 at the end of the shaft, and is configured to output a constant decelerated rotational force by the gear train built in the gearbox 30. The center of the output shaft 35 is also a key. Thereby, the driven gear 36 provided so that it may rotate integrally is provided.

At this time, between the drive gear 32 and the driven gear 36 is provided with an intermediate gear 34 of a double gear of large and small diameters, and finally, the reduction ratio in the gear box 30 is driven gear 32 and driven It is determined by the product of the ratio of the number of teeth of the gear 36 and the ratio of the number of teeth between the large gear and the small gear of the intermediate gear 34, and this reduction ratio makes the rotational force of the high speed low torque of the engine 10 low speed high. The torque is converted into power and transmitted to the driving pulley 37.

Between the output shaft 35 and the driven gear 36 is a one-way bearing 33a that rotates in only one direction, the inner circumferential surface of the one-way bearing 33a is fixedly coupled to the output shaft 35, the outer peripheral surface is It is fixedly coupled to the inner peripheral surface of the output shaft (35).

In addition, the input side outer wall of the housing 38 is provided with a flange 301 having a fastening hole, so that the engine 10 can be firmly fastened without a separate bracket or the like, and the number of parts The installation space is minimized.

Meanwhile, as shown in FIGS. 2B and 2C, one side of the driving wheel 50 is provided with a driven pulley 47 installed to rotate integrally with the driving wheel 50. The driving pulley 37 and the driven pulley 47 are provided. Various types of belt pulleys may be employed. However, in the present preferred embodiment, the belt belt pulleys 37 and 47 and the belts 48 having constant teeth formed on the outer circumferences of each other are used to generate power without slipping. It is configured to be delivered.

Looking at the operation of the preferred embodiment of the present invention by the above configuration as follows.

First, when the rotational force of the high speed low torque of the engine 10 is transmitted to the gearbox 30 through the centrifugal clutch 20, by the reduction gear trains 32, 34 and 36 installed in the gearbox 30. The power of the moderately decelerated low-speed high torque is output by the driving pulley 37, and the power of the driving pulley 37 is driven by the toothed belt 48 on the driven wheel 50 on one side of the driven pulley 47. Is transmitted to drive the driving wheel (50).

Subsequently, when the mini-scooter travels downhill, the driving wheel 50 is rotated faster than when driven by the engine, and the rotational force of the driving wheel 50 is transmitted to the output shaft 35 through the belt 48. However, since the rotational force of the output shaft 35 is blocked by the one-way bearing 33a, the engine brake is not applied, and the mini-scooter freely slides downhill.

As can be seen from the above, the power transmission device of the belt transmission method according to the present invention is driven by the driving pulley 37 and driven pulley 47, the power of which is properly decelerated by the gearbox 30 does not have a large diameter difference. Because of the belt transmission, there is a significant difference in diameter between the two sprocket wheels 71 and 73 as in the conventional FIG. 1D, in particular the number of teeth of the chain 72 that has occurred because the number of teeth of the drive side sprocket wheel 71 must be minimized. Vibration and noise can be prevented, and accordingly, the chain 72 is peeled off the sprocket wheels 71 and 73 as in the prior art, thereby preventing the inconvenience of having to reinsert it.

In addition, in the belt transmission method, the diameter of the driven side driven pulley 47 of FIG. 2C can be designed to an appropriate size, and also has a strong impact strength thereof compared to the conventional sprocket wheels 71 and 73. By using), it is possible to alleviate the inconvenience that the power transmission is impossible due to the bent by hitting the protrusion of the ground while driving as in the prior art.

On the other hand, in the belt transmission method according to the present invention there is no part that is in close contact with the direct drive wheel 50 as in the conventional friction drive method as shown in Figure 1a is to prevent foreign matter such as mud stuck in the close contact portion There are very few cases where it is possible to provide an all-weather mini scooter that is relatively free of use.

Claims (3)

In the power transmission device for transmitting the power to the drive wheel 50 by providing a friction disk 21 of the centrifugal clutch at the output end of the engine 10, A friction cylinder 23 of a centrifugal clutch is provided at the input shaft 31 end, and a driving pulley 37 is installed at the output shaft 35 end, so that the rotational force of the input shaft 31 is applied to the output shaft 35 at a predetermined reduction ratio. A gearbox 30 formed to be able to transmit; By connecting the driven pulley 47 and the driving pulley 37 of the gearbox output shaft 35 to the belt 48 to be integrally rotated on one side of the driving wheel 50 to transmit power, vibrations according to power transmission Power transmission device for a portable mini scooter, characterized in that configured to reduce noise and noise. The driving gear 32 of the input shaft 31 and the driven gear 36 of the output shaft 35 and between the drive gear 32 and the driven gear 36 in the gear box 30. Portable gears, characterized in that the intermediate gear 34 of the interlocking gears are installed in engagement with each other so as to transmit rotational force at a predetermined reduction ratio, and the one-way bearing 33a is fixedly coupled between the output shaft 35 and the driven gear 36. Scooter power train. According to claim 1, characterized in that the flange 301 is formed on one surface of the housing 38 of the gearbox, so that the engine 10 can be installed on the flange 301 without a separate bracket. Power train of portable mini scooter.