TWI699294B - Hub and bicycle transmission - Google Patents

Abstract

A hub for bicycles includes a spindle, a transmission body, a wheel hub and a one-way bearing. The central shaft is arranged on the bicycle, and the transmission body is sleeved on the spindle. The transmission body can be connected to the flywheel of the bicycle, and is driven by the flywheel to rotate on the spindle. In addition, a space is formed between the transmission body and the spindle. The hub can be sleeved on the spindle and the transmission body, and the one-way bearing is arranged between the hub and the transmission body. Through the one-way bearing, the wheel hub can be driven by the transmission body to rotate in one direction, thereby driving the wheel of the bicycle to rotate. The space formed between the transmission body and the spindle can reduce the weight of the hub to achieve the effect of lightweight bicycle.

Description

Hub and bicycle transmission

The present invention relates to hubs and bicycle transmissions; in particular, it refers to lightweight hubs and bicycle transmissions.

The transmission system of the bicycle is carried out by a chainring and chain transmission system. When riding, the rider pedals to drive the large chainring to rotate, and then the flywheel is rotated through the chain transmission, and the flywheel will drive the rear wheel of the bicycle to rotate together, thereby Drive the bicycle forward. There is a hub at the center of the rear wheel of the bicycle, which can be connected to the flywheel and the rim through the spokes. The function of the hub is to transmit the rotating force of the flywheel to the outer rim to cause the entire rear wheel to rotate, thereby driving the entire bicycle forward. Therefore, the hub is also an indispensable part of the bicycle transmission.

Please refer to FIG. 1. FIG. 1 is a schematic cross-sectional view of a hub 1 of the prior art. As shown in Figure 1, the hub 1 includes a spindle 10, a transmission portion 12, a hub 14, and a one-way bearing 16, wherein the transmission portion 12 and the hub 14 are sleeved on the spindle 10, and the transmission portion 12 can be driven by a flywheel. It rotates on the spindle 10 and selectively drives the hub 14 to rotate together through the one-way bearing 16. The hub 14 is used to connect the spokes of the rear wheel of the bicycle, so when the hub 14 rotates, the rear wheel of the bicycle also rotates. However, it can be seen from FIG. 1 that when the hub 1 of the prior art is in operation, because the transmission part 12 is close to the spindle 10, friction between the transmission part 12 and the spindle 10 may increase the resistance. In addition to increasing driving resistance, the heat generated by friction may have an adverse effect on the hub. For example, thermal expansion and contraction may cause the components in the hub to squeeze each other; in addition, friction will accelerate the wear rate of the hub and shorten the life of the hub.

On the other hand, in addition to serving as a means of transportation for people's daily life, bicycles are also regarded as one of the tools of sports or competitions because they must be stepped on by humans. Bicycles used in sports or competitions may have different types depending on the venues or competitions used. Lighter bicycles can greatly improve the performance and performance of riders in terms of speed and distance. Therefore, in addition to improvements in structure and robustness of modern bicycles, lightweighting is also the focus of development for sports or racing bicycles. In addition to the development of a frame with the same or higher strength but a lighter weight as an alternative, the means to achieve lightweight bicycles can also reduce the weight of other parts without affecting the structural strength. Hubs also need to be further reduced in weight to meet the needs of lightweight bicycles.

Therefore, it is necessary to develop a new type of hub to solve the above problems and achieve the goal of lightening.

In view of this, the purpose of the present invention is to provide a hub for bicycles, which can solve the problems of the prior art and achieve the effect of lightweight.

In order to achieve the above objective, the hub provided by the present invention has a spindle, a transmission body, a hub and a one-way bearing, wherein the transmission body and the hub are sleeved on the spindle and the hub is sleeved on the transmission body. The transmission body can be driven by the flywheel of the bicycle to rotate on the spindle. A one-way bearing is arranged between the wheel hub and the transmission body. Through the one-way bearing, the wheel hub can rotate with the transmission body in one direction. There is a space between the transmission body and the spindle, which can achieve the function of lightening and reducing friction.

Another object of the present invention is to provide a bicycle transmission device that can solve the problems of the prior art and achieve the effect of light weight.

In order to achieve the above object, the bicycle transmission device provided by the present invention has a flywheel and a hub connected to the flywheel. The hub has a spindle, a transmission body, a hub and a one-way bearing, wherein the transmission body and the hub are sleeved on the spindle and the hub is sleeved on the transmission body. The transmission body can be connected to the flywheel and can be driven by the flywheel to rotate on the spindle. A one-way bearing is arranged between the wheel hub and the transmission body. Through the one-way bearing, the wheel hub can rotate with the transmission body in one direction. There is a space between the transmission body and the spindle, which can achieve the function of lightening and reducing friction.

Thereby, the hub and bicycle transmission device of the present invention can achieve the effect of reducing the weight and reducing the wear of the hub.

In order to explain the present invention more clearly, the preferred embodiments are described in detail in conjunction with the drawings. Please refer to FIG. 2. FIG. 2 is a schematic diagram of a hub 2 according to a specific embodiment of the present invention. The hub 2 can be used at the wheel axis of a bicycle and connected to the flywheel F of the bicycle. In practice, both the flywheel F and the hub 2 can be part of the bicycle transmission. The rider can step on the pedals to drive the bicycle chain plate to rotate, and the chain plate drives the flywheel F to rotate together through the chain. When the flywheel F rotates, the hub 2 can be selectively driven to rotate together. In detail, when the rider pedals forward, the flywheel F can drive the hub 2 to rotate together, and when the rider pedals backward or not, the flywheel F If it is not linked with hub 2, hub 2 will maintain the previous movement state. The hub 2 can be connected to the rim and the tires on the rim through spokes to rotate together with the hub 2, whereby the bicycle transmission device can drive the bicycle forward.

Please refer to FIGS. 3 and 4 together. FIG. 3 is an exploded view of the hub 2 of FIG. 2, and FIG. 4 is a schematic cross-sectional view of the hub 2 of FIG. 2. As shown in FIGS. 3 and 4, the hub 2 includes a spindle 20, a transmission body 22, a hub 24 and a one-way bearing 26. The spindle 20 can be installed on the bicycle. In detail, the spindle 20 can be used as the axle center of the wheel, and it can pass through the part of the bicycle body for connecting the wheel. Please note that the mandrel 20 can be formed by a shaft 200, a shaft 202, a shaft sleeve 204, and a shaft sleeve 206 sleeved with each other. The transmission body 22 can be sleeved on the spindle 20, and its outer side can be connected to the flywheel F of the bicycle, so that the transmission body 22 can be driven by the flywheel F to rotate on the spindle 20. The hub 24 can also be sleeved on the spindle 20 and partly sleeved on the transmission body 22. In practice, the hub 24 can be directly connected to one end of a plurality of spokes, and further connected to the rim and the tires on the rim through the spokes. In other words, the rotation of the hub 24 will directly drive the wheel to rotate and further push the bicycle forward.

A one-way bearing 26 can be provided between the hub 24 and the transmission body 22, and the one-way bearing 26 allows the hub 24 to be driven by the transmission body 22 to rotate in one direction. For example, when the transmission body 22 rotates forward, the one-way bearing 26 makes the hub 24 and the transmission body 22 rotate together in the same direction. Conversely, when the transmission body 22 rotates backward or does not rotate, the one-way bearing 26 Therefore, the hub 24 and the transmission body 22 can move independently, so the hub 24 does not rotate with the transmission body 22. With the one-way bearing 26, the rider can push the bicycle forward when pedaling forward, and when the rider pedals backward or does not pedal, the bicycle wheel will maintain the previous state of motion.

In this embodiment, the transmission body 22 forms a space 220 close to the mandrel 20, so that the transmission body 22 does not contact the mandrel 20 in this space 220, thereby reducing the contact area between it and the mandrel 20, so When the rider pedals on the pedal while riding the bicycle, the transmission body 22 will reduce the chance of friction with the spindle 20 when it is driven and rotated, so it can avoid the generation of extra resistance to improve the pedaling efficiency and reduce the heat generated by the hub 2 And the loss caused by friction. At the same time, since a space 220 is formed in the transmission body 22, the volume and weight of the transmission body 22 and the hub 24 are relatively reduced, so that the overall hub 2 can be lightened.

Please refer to FIG. 4 again. As shown in FIG. 4, in this embodiment, the hub 2 further includes a first bearing 280, a second bearing 282, and a third bearing 284. The first bearing 280 may be disposed between the transmission body 22 and the spindle 20 so that the transmission body 22 can rotate relative to the spindle 20. The second bearing 282 can be arranged between the transmission body 22 and the hub 24 so that the hub 24 can rotate relative to the transmission body 22. The third bearing 284 may be disposed between the hub 24 and the spindle 20 so that the hub 24 can rotate relative to the spindle 20. In this embodiment, the number of the first bearing 280 and the third bearing 284 is one, and the number of the second bearing 282 is two. However, the number of the three is not limited in practice, and the user or designer Different numbers of the first bearing 280, the second bearing 282, and the third bearing 284 can be provided in consideration of their needs. In addition, the first bearing 280, the second bearing 282, and the third bearing 284 are all ball bearings in this embodiment. The ball structure is used to reduce the frictional force between the spindle 20, the transmission body 22 and the hub 24 during rotation. However, ball bearings are not limited in practice. Any bearing that can reduce the frictional force of rotation can be used as the first bearing 280, the second bearing 282, and the third bearing 284 of this embodiment.

In summary, the hub of the present invention and the bicycle transmission device using the hub can reduce friction during rotation of the hub by arranging a space between the transmission body and the spindle to reduce driving resistance, heat energy and loss caused by friction. In addition, the overall weight of the hub is also reduced at the same time, which is beneficial to the lightweight of the bicycle.

The above are only the preferred and feasible embodiments of the present invention. Any equivalent changes made by applying the specification of the present invention and the scope of the patent application should be included in the patent scope of the present invention.

[Prior Art] 1.‧‧Hube 10‧‧‧Mandrel 12‧‧‧Transmission part 14‧‧‧Wheel [Invention] 2.‧‧Hube 20‧‧‧Mandrel 22‧‧‧Transmission body 24‧‧ ‧Wheel hub 26‧‧‧One-way bearing 200‧‧‧Axis 202‧‧‧Axis 204‧‧‧Axis sleeve 206‧‧‧Axis sleeve 220‧‧‧Space 280‧‧‧First bearing 282 ‧‧‧Second bearing 284‧‧‧Third bearing F‧‧‧Flywheel

Figure 1 is a schematic cross-sectional view of a prior art hub. Figure 2 is a schematic diagram of a hub according to a specific embodiment of the present invention. Figure 3 is an exploded view of the hub of Figure 2. Fig. 4 is a schematic cross-sectional view of the hub of Fig. 2.

2‧‧‧Hube

20‧‧‧Mandrel

22‧‧‧Transmission body

24‧‧‧Wheel

26‧‧‧One-way bearing

220‧‧‧Space

280‧‧‧First bearing

282‧‧‧Second Bearing

284‧‧‧Third bearing

F‧‧‧Flywheel

Claims (8)

A hub for a bicycle. The hub includes: a spindle to be installed on the bicycle; a transmission body sleeved on the spindle and connected to a flywheel of the bicycle; the transmission body and the spindle include A space, and the transmission body can be driven by the flywheel to rotate on the spindle; and a hub sleeved on the spindle and the transmission body for connecting a wheel of the bicycle; a one-way bearing, Is arranged between the transmission body and the hub for driving the hub to rotate with the transmission body in a single direction; and two second bearings are sleeved on the transmission body and arranged between the transmission body and the hub, wherein The one-way bearing is located between the two second bearings, and the space is located between the orthogonal projections of the two second bearings. The hub according to claim 1, further comprising a first bearing disposed between the spindle and the transmission body. The hub according to claim 1, further comprising a third bearing arranged between the spindle and the hub. The hub according to claim 2 or 3, wherein the first bearing, the second bearing and the third bearing are ball bearings. A bicycle transmission device for a bicycle. The bicycle transmission device includes: a flywheel; and a hub connected to the flywheel. The hub includes: a spindle for being arranged on the bicycle; A transmission body sleeved on the spindle and connected to the flywheel, a space is included between the transmission body and the spindle, and the transmission body can be driven by the flywheel to rotate on the spindle; and a hub, sleeved On the spindle and the transmission body, for connecting a wheel of the bicycle; a one-way bearing, arranged between the transmission body and the hub, for driving the hub to rotate with the transmission body in one direction; and Two second bearings sleeved on the transmission body and arranged between the transmission body and the hub, wherein the one-way bearing is located between the two second bearings, and the space is located in the orthogonal projection of the two second bearings between. The bicycle transmission device according to claim 5, further comprising a first bearing disposed between the spindle and the transmission body. The bicycle transmission device according to claim 5, further comprising a third bearing disposed between the spindle and the hub. The bicycle transmission device according to claim 6 or 7, wherein the first bearing, the second bearing and the third bearing are ball bearings.

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