WO2008011831A1

WO2008011831A1 - A drive unit for a small wheel vehicle

Info

Publication number: WO2008011831A1
Application number: PCT/CN2007/070309
Authority: WO
Inventors: Qibin Huang
Original assignee: Qibin Huang
Priority date: 2006-07-21
Filing date: 2007-07-17
Publication date: 2008-01-31
Also published as: CN101108645A

Abstract

A drive unit for a small wheel vehicle comprises a pressure plate, a train turning generating source, an intermediate power train and a clutch. The train turning generating source is a planet train which includes a sun wheel (2), a planetary gear (3), arc planetary orbit annulus (4) and a biased planetary swing rack (5). One end of the biased planetary swing rack (5) is coaxial hinged to the sun wheel(2). The arc planetary orbit annulus (4) is fixed to a car frame (10) and is coaxial to the sun wheel (2). The planetary gear (3) is hinged to a main body of the swing rack (5) and engages with the annulus (4). When driven, the pressure plate push against the other end of the biased planetary swing rack (5) and the swing rack (5) swing around the sun wheel(2). The planetary gear (3) on the swing rack (5) revolves around the sun wheel(2) while it autorotates by engaging with the annulus (4). The rotation of the planetary gear (3) is transferred to the sun wheel (2) by the intermediate power train. The rotation of the sun wheel (2) drives wheels of the small wheel vehicle via the clutch. The drive unit has the advantages of simple structure, small volume, high transmission ratio and may have multi rotating speeds.

Description

BMX drive unit

The invention relates to a driving device for a BMX. Background technique

In the bicycle construction, the pedal is commonly used to transmit to the rear wheel through a long chain, so that the rear wheel diameter is large enough to obtain the required speed of the vehicle, so that the overall structure of the bicycle is large, and parking and storage become the biggest problem that plagues people. With the improvement of the construction of the city roads, the light equipment such as BMX, scooters, skateboards and roller skates began to impact the development of bicycles, but they all stayed in the stage of youth sports and skills due to the lack of effective and simple driving devices. .

In recent years, some small-wheeled scooters have been designed with various driving devices. For example, the Chinese Utility Model Patent Application Publication No. CN2460436 (November 21, 2001) discloses a driving mechanism for a scooter. The driving mechanism rotates a large gear to rotate a fixed pinion through a pedal. Then, it is driven by a fixed gear set and finally transmitted to the rear wheel of the scooter via a ratchet. Although the scooter is smaller than the bicycle structure, the radius of the sector gear is limited due to the consideration of the volume of the rotating large sector gear and the gearbox, so that the limited angular velocity is not enough to make the scooter small diameter rear wheel line. The speed is large enough. In the prior inventions or utility models, the planetary gear shifting device having a large gear ratio is not suitable for the BMX because of the large overall structure, such as the Chinese Patent Application Publication No. CN1298823 (published on June 13, 2001) A planetary wheel drive method is disclosed. Its complete planetary gear train limits the diameter of the planetary track ring gear and limits the gear ratio. Its original crank pedals greatly exceed the wheel diameter of the BMX and thus have to retain the large frame of the original bicycle.

In the multi-speed clutch device for obtaining the desired rotational speed, the shift clutch currently used is generally known in the conventional two ways: First, the gearbox gear axially slides to change the meshing gear set, such a square It is easy to cause the gear collision to be difficult to engage in the gear. The car thus increases the synchronizer or clutches the two feet of the clutch, and the machine tool has to stop to shift gears. Second, the chain fork changes the matching sprocket piece, which is naturally limited. In the transmission of the chain, and the entire device is still large, these are unsatisfactory for the BMX. Summary of the invention

In view of this, the main technical problem to be solved by the present invention is to provide a BMX driving device which has a simple structure, a small volume, a high transmission ratio, and can simultaneously have multiple speeds.

In order to achieve the above technical problem, the technical solution of the present invention is implemented as follows: A driving device for a BMX includes a pressure plate, a wheel rotation generating source, an intermediate transmission system, and a clutch device, wherein the wheel rotation generation source is a planetary gear train comprising a sun gear, a planetary gear, a curved planetary orbital ring gear and an offset planetary swing frame; said one end of said swing frame being coaxially articulated with said sun gear, said curved planetary track ring gear Fixedly mounted on the frame and coaxial with the sun gear, the planetary gear is hinged to the frame of the swing frame and engaged with the ring gear; when driving, the pressure plate presses the other end of the swing frame, The swinging arm swings around the sun gear, and the planetary gear on the swing frame rotates with the ring gear to revolve around the sun gear, and the rotation of the planetary gear is transmitted to the sun gear through the intermediate transmission system, the sun The rotation of the wheel drives the wheel of the BMX through the clutch device.

The intermediate drive train described above may be mounted between the planet gear and the sun gear on the swing frame; the clutch device is a one-way overrunning ratchet.

The intermediate drive train may be one or more idler intermediate drive trains mounted on the swing frame, and may be one or more variable speed drive gear sets formed on the swing frame and the sun gear. .

The above-mentioned transmission gear set is provided with two or more sets, each of which is provided with the adapted sun wheel and one-way overrunning ratchet.

The one-way overrunning ratchet can be axially side-engaged, and the ratchet and the pawl are axially mounted opposite each other. Axial sliding.

The intermediate drive train can be mounted on the swing frame with a chain, the input sprocket is driven by the planetary gear, and the sun gear is an output sprocket, and the two sprockets are linked by a chain.

In the above intermediate drive train, an intermediate transmission gear that meshes with the planetary gear is further provided with a one-way overrunning ratchet between the shaft and the shaft.

Another solution to solve the technical problem of the present invention is: a driving device for a small wheeled vehicle, comprising a pressure plate, a wheel rotation generating source, an intermediate transmission system and a clutch device, wherein the pressure plate is pressed to drive the large and small wheels to rotate, and the intermediate transmission is driven. The second or second gear is provided, and the wheel is driven by the clutch device; the clutch device is a one-way overrunning ratchet, and each intermediate drive train is fitted with a ratchet.

In the above intermediate transmission system of the second gear or more, the clutch device is a one-way overrunning ratchet of the axial side structure, the ratchet teeth are coaxially opposed to the pawl, and the ratchet teeth are coupled with the coaxial side of the corresponding sun gear on the upper side, the pawl and the pawl The lower drive bushing is coaxially coupled to the side, the ratchet and the upper sun gear are axially slidable with the shift fork, and the pawl directly or indirectly drives the wheel through the lower drive bushing.

The technical effects achieved by the present invention are as follows:

According to the BMX driving device of the present invention, since the swing frame reciprocates only in a certain arc with the pressure plate, the fixedly mounted planetary track ring gear can only retain the portion of the planetary wheel passing through, and the volume is greatly reduced; The output speed increases with the increase of the radius of the planet's orbit. After the planetary frame is in the form of an asymmetrical swing frame, the intermediate drive train is sequentially mounted on the pendulum frame, which makes the structure very compact and can easily adjust the ideal planetary orbital radius. A higher gear ratio is achieved, resulting in a simple structure, small size, and high speed. The axially mounted one-way overrunning ratchet also acts as a shifting clutch, and because of the large difference between the tooth tip section and the two-pitch space ratio, the shifting clutch is very easy. Figure 3 is a plan view of the three-stage gear set component of Figure 2;

Figure 4 is a schematic structural view of the intermediate drive train as two sets of three-stage gear sets;

Figure 5 is a partial enlarged view of a portion A in Figure 4;

Figure 6 is a plan view showing the structure of the slow speed component in the two-stage three-gear gear train;

Figure 7 is a partial enlarged view of a portion B of Figure 6;

Figure 8 is a structural schematic view of the components of the fast gears of the two sets of three-stage gear trains of Figure 4; Figure 9 is a partial enlarged view of the portion C of Figure 8;

Figure 10 is a schematic structural view of the intermediate drive train of the chain drive;

Figure 11 is a structural schematic view showing the addition of a one-way overrunning ratchet in the second embodiment; Figure 12 is a partial cross-sectional view taken along line D-D of Figure 11. detailed description

1 shows a first embodiment of a driving device for a BMX according to the present invention, comprising a pressure plate 6, a wheel rotation generating source, an intermediate transmission system and a clutch device. The wheel rotation generation source is a planetary gear train including a sun gear. 2. Planetary wheel 3, curved planetary orbital ring 4 and offset asymmetric planetary pendulum 5. One end of the swing frame 5 is coaxially hinged with the sun gear 2, and the curved planetary track ring gear 4 is fixedly mounted on the frame 10 and coaxial with the sun gear 2, and the planetary gear 3 is hinged to the frame of the pendulum 5 and is coupled with the teeth. The ring 4 is engaged; when the driving plate 6 presses the other end of the pendulum 5, the pendulum 5 swings around the sun gear 1 , and the planet gear 3 on the pendulum 5 follows the ring gear 4 to revolve while rotating around the sun gear 2 to generate rotation. The rotation of the planet gears 3 is transmitted to the sun gear 2 through the intermediate drive train, and the rotation of the sun gear 2 drives the wheelbarrow wheels 9 through the clutch device.

The intermediate drive train is mounted between the planet gear 3 and the sun gear 2 on the swing frame 5; the clutch device is a one-way overrunning ratchet 8. The intermediate drive train can be an idler, and the swing frame 5 is mounted coaxially with the sun gear 2, the ratchet 8 and the rear wheel 9 of the BMX on the rear axle 1 of the vehicle body 10. The swing frame 5 swings freely around the rear axle 1 and the sun gear 2 is coupled with the ratchet 8 outer ring set, the inner ring of the ratchet 8 is fixedly coupled with the wheel 9, the wheel 9 is rotated by the bearing on the rear axle 1; the intermediate drive idler 7 and the planet are sequentially mounted on the pendulum 5 The wheel 3, the planetary gear 3 meshes with the ring gear 4, the ring gear 4 is fixedly mounted on the vehicle body 10 and coaxial with the sun gear 2; the other end of the pendulum frame 5 is placed under the pressure plate 6, and the pressure plate 6 can be directly hinged to the swing frame The upper end of 5 can also be hinged on the vehicle body 10 and extended above the swing frame 5, and can be arbitrarily adjusted according to the design of the vehicle to facilitate pressing; when the pressure plate 6 is pressed downward, the swing frame 5 swings around the sun gear 2, the planetary gear 3 follows the engagement with the ring gear 4 when the sun gear 2 revolves, and the rotation can be directly driven by the planetary gear 3 to the sun gear 2, or can be transmitted to the sun gear 2 through the intermediate transmission idler 7, and finally through the one-way overrunning ratchet 8 The drive wheel 9 is rotated at a high speed. As a simple way of the intermediate drive train, when the pressure plate 6 and the swing frame 5 are moved to the rear and rear of the wheel, the wheel 9 rolls forward; when the number of idlers is even, the pressure plate 6 and the swing frame 5 are directed to the wheel. The front and lower movements, the wheel 9 rolls forward. After the pendulum 5 is pressed down, it can be reset by various known simple methods such as tension springs, coil springs or platen belts, which are not shown in the drawings.

Fig. 2 and Fig. 3 show a second embodiment of the BMX driving device of the present invention. On the basis of the first embodiment, the idle gear 7 is changed to a three-stage gear train variable speed transmission. The gear body 5 is equipped with a planetary gear 3 and five intermediate transmission gears 1 11 , 112 , 11 3 , 114 , 115 in the gear train transmission sequence , and the intermediate transmission gear and the sun gear 2 together form a three-stage gear shifting group; the planetary gear 3 When the middle swinging frame 5 revolves around the sun gear 1 and rotates with the ring gear 4 of the planetary track to generate rotation, the rotation is transmitted to the sun gear 2 through the intermediate transmission gear set and then finally driven to the wheel 9 by the ratchet 8 . The three-speed shifting transmission adjusts the pressure plate 6 and the swing frame 5 to move forward and downward, and the wheel 9 rolls forward.

4-7 are diagrams showing an embodiment of the intermediate drive train as two sets of three-stage gear sets, showing a third embodiment of the BMX drive of the present invention, the intermediate drive train being two sets of three-stage gear trains. On the basis of the second embodiment shown in FIG. 2, a sun gear 13 and a one-way overrunning ratchet 14 are added to the rear axle, and an intermediate transmission gear 12 is added correspondingly to the intermediate transmission system, thereby obtaining implementation. The second gear transmission is added to the first gear of the second mode. Figures 8 and 9 are diagrams showing the fast mode implementation of the intermediate drive train as two sets of three-stage gear sets, showing a particular form of the third embodiment of the BMX drive of the present invention. The commonly known one-way overrunning ratchets are all radially meshed, and the present embodiment is an axial meshing drive. The side of the ratchet ratchet 141 is coupled to the sun wheel 13 axial backrest, the side of the ratchet tooth 141 is axially extended, the opposite ratchet pawls 15 are coaxially mounted, and the pawl 15 is coupled back to the inner ring 16 of the ratchet 8 . When the sun gear 13 and the ratchet 14 are pulled out axially outward by a certain distance as shown in FIG. 5, the pawl 15 is disengaged from the engagement of the ratchet teeth 141, as shown in FIG. The rotation of the planetary gear 3 is transmitted to the rear wheel according to the basic transmission chain shown in FIG. 3; when the sun gear 13 and the ratchet ratchet 141 are pushed by the shift lever 17 to the pawl 15, the planetary gear is shown in FIG. The rotation of 3 is transmitted to the sun gear 13 through a portion of the intermediate transmission gears 111, 112, 113, and 14 and the intermediate transmission gear 12 having a relatively large transmission, and is driven by the ratchet teeth 141, the pawl 15, and the inner ring 16 of the ratchet 8 Wheel 9 , at this time because the ratchet 8 is also a one-way overrunning ratchet, the slower speed transmitted by the sun gear 1 will have no effect on it. The one-way overrunning ratchet 14 of the axial side meshing has a large space ratio difference between the tip tip section and the two teeth, making the shifting very easy and becoming a good clutch.

Fig. 10 shows a fourth embodiment of the BMX drive of the present invention. Based on the first embodiment, the intermediate drive train is changed to the chain drive mode. The chain transmission method as shown in the figure is also a comprehensive expression of the first transmission mode. The rotation of the planetary gear 3 is redirected by an idler pulley 7 and transmitted to the coaxial input sprocket 18, which is transmitted via the chain 19 to the sun gear 2, which is the output sprocket. The chain drive makes the planetary track radius easier to adjust.

As shown in Figs. 11 and 12, on the basis of the second embodiment, another form of the intermediate drive train of the BMX drive unit is shown. A one-way overrunning ratchet 21 is added between the first intermediate transfer gear 111 immediately adjacent to the planet gear 3 and the shaft 20. As shown, the planetary gear 3 is coaxially fixedly coupled to the inner ring 22 of the one-way overrunning ratchet 21 on the sleeve 23, and reciprocally rotates on the shaft 20 with the up and down movement of the pendulum 5; the intermediate transfer gear 111 passes the ratchet The engagement of the inner ring 22 with the inner ring 22 is only one-way rotation, and the lower intermediate transmission gear 112 is driven to rotate in one direction. One-way transcendence of this addition The ratchet 21 reduces the energy consumption of the intermediate transmission, and the one-way operation is easy, and the multi-speed setting is more convenient.

As shown in Figures 4-9, both an embodiment of the intermediate drive train and an ideal embodiment of the multi-speed shift of the BMX drive of the present invention are shown. This mode is still composed of the pressure plate, the wheel rotation generating source, the intermediate transmission system and the clutch device, and the two-speed or multi-speed shifting is applied to the intermediate transmission, and the shifting clutch device is simpler and more convenient. The commonly known one-way overrunning ratchets are all radially meshed, and the ideal embodiment is to use an axially engaged one-way overrunning ratchet as a shifting clutch device. On the basis of the slowest gear, each additional gear is added. , configured with a corresponding axial engagement one-way beyond the ratchet and the sun gear. In this illustration, only two files are explained.

The gear meshing used in the present invention can also be used to press the roller drive with a rubber wheel; the sprocket drive used in the present invention can also be replaced by a pulley drive.

The driving device of the BMX of the invention can be installed coaxially with the rear wheel of the BMX, or can be installed coaxially with the front wheel; and can also be installed in a second, third or fourth wheel vehicle; The driving device can also install two or more sets of devices at the same time; the intermediate drive train can be any one of the foregoing methods, or a combination of several ways; the axially engaged one-way overrunning ratchet can be mounted behind the drive train On the sun axle, it can also be mounted on the planetary axle in front of the drive train, or it can be combined with the front and rear to form a combined shift clutch.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Claims

Claim

A driving device for a BMX, comprising a pressure plate, a wheel rotation generating source, an intermediate transmission system and a clutch device, wherein the wheel rotation generating source is a planetary gear train, including a sun gear

(2), a planetary gear (3), an arcuate planetary orbital ring (4), and an offset planetary swing (5); the swing (5) end is the same as the sun gear (2) The shaft is hinged, and the curved planetary orbital ring gear (4) is fixedly mounted on the frame (10) and coaxial with the sun gear (2), the planetary gear

(3) hinged to the frame of the pendulum (5) and engaged with the ring gear (4); when driving, the platen (6) presses the other end of the pendulum (5), the pendulum (5) Rotating around the sun gear (2), the planet gear (3) on the pendulum (5) meshes with the ring gear (4) while revolving around the sun gear (1) to produce rotation, the planet gear The rotation of (3) is transmitted to the sun gear (2) through the intermediate drive train, and the rotation of the sun gear (2) drives the wheelbarrow wheels (9) through the clutch device.

2. The driving device for a BMX according to claim 1, wherein said intermediate transmission is mounted between said planetary gear (3) and said sun gear (2); said clutch The device is a one-way overrunning ratchet (8).

3. A driving device for a BMX according to claim 1 or 2, wherein said intermediate transmission is one or more idlers mounted on said pendulum (5) (7) ).

4. The driving device for a BMX according to claim 1 or 2, wherein said intermediate transmission is a stage mounted on said swing frame (5) and said sun gear (2) or Multi-speed transmission gear set.

5. The driving device for a BMX according to claim 4, wherein the transmission gear set is provided with two or more groups, each of which is provided with the matching sun gear (2). ), Sun gear

(13) and the one-way overrunning ratchet (8) and the one-way overrunning ratchet (14).

6. The driving device for a BMX according to claim 5, wherein said one-way overrunning ratchet (14) is axially side-engaged, and the ratchet (141) and ratchet pawl (15) are axially Relative to the installation, the ratchet (141) slides in the axial direction. 7. The driving device for a BMX according to claim 1 or 2, wherein the intermediate transmission system is mounted on the swing frame (5) with a chain, and the input sprocket (18) is The planetary gear (3) is driven, and the sun gear (2) is an output sprocket, and the two sprockets are linked by a chain (19).

8. The driving device for a BMX according to claim 1, wherein an intermediate transmission gear (111) meshing with the planetary gear (3) and the shaft (20) are added to the intermediate transmission system. One-way beyond the ratchet (21).

9. A driving device for a BMX, comprising a pressure plate, a source of rotation of the wheel train, an intermediate transmission system and a clutch device, wherein the pressure plate presses the rolling wheel to rotate, and the second transmission is provided through the intermediate transmission system or Above the second gear, the wheel is driven by the clutch device; the clutch device is a one-way overrunning ratchet, and each intermediate drive train is fitted with a ratchet.

10. The driving device for a BMX according to claim 9, wherein the intermediate transmission system of the second gear or more, the clutch device is a one-way overrunning ratchet of the axial side configuration, the ratchet (141) and the pawl (15) The coaxial axis is opposite, the ratchet (141) is mounted axially opposite the ratchet pawl (15), and the ratchet (141) slides in the axial direction.