TWI802959B - One‑way clutch of a bicycle axle - Google Patents

Abstract

There are two sources of power for all electrically assisted bicycles to transfer the power to a chainwheel. One is electric motor. The other is pedaling force. To make the two different powers be input into the chainwheel without interaction, a coaxial hollow shaft tend be generally added on the pedal spindle. The hollow shaft is combined with the pedal spindle through a one‑way clutch and linked to the electric motor through the one‑way clutch or the one‑way bearing. By appropriately arrange the one‑way clutch’s direction of rotation, the pedaling force and electric motor can be transmitted without interaction. If the battery has no power supply or the auxiliary force of the electric motor is low while acceleration or climbing, the torque force which transmits the pedaling force to the hollow shaft through the pedal spindle and further to the chainwheel should be high. At this time, the size and weight of the existing one‑way bearings in the market are bound to be great that are unable to meet the requirement of small size and light weight for the product. In light of this, the present invention directly retrofits the existing hollow shaft and pedal spindle to an intermeshing one‑way clutch that increases torque force of the transmission of pedaling force and achieves efficacy of high strength, small size and light weight.

Description

One-way clutch for bicycle axle

The present invention provides a one-way clutch for a bicycle axle. There are two sources of power for all electric bicycles to transmit power to the large chainring, one is the electric motor, and the other is pedal force. The input of the large chainring without mutual influence often requires adding a coaxial hollow shaft to the pedal shaft. The auxiliary motor is connected; when the rotation direction of the one-way clutch is properly arranged, the effect of the pedal and the electric auxiliary motor being independent of each other can be achieved. When accelerating or climbing, the battery is not powered or the auxiliary force of the electric auxiliary motor When it is low, the pedal force will be transmitted to the hollow shaft through the pedal shaft, and then the torque transmitted to the large chainring will be very large. At this time, if the existing one-way bearing in the market is used, the size and weight of the one-way bearing will also inevitably increase. It is very large, which will not meet the product's requirements for small size and light weight; in view of this, the present invention directly transforms the existing hollow shaft and pedal shaft, and cooperates with a one-way clutch designed to engage with each other, which can also increase the number of feet. The torque of the pedal transmission, and has the effect of high strength, small size and light weight.

Based on the needs of environmental protection and easy and comfortable riding, there are many different electric bicycles on the market, and the electric bicycle system can be divided into front wheel, rear wheel and center system according to the position of the electric motor. Among them, the motor Electric-assisted bicycles equipped with electric bicycles will be an important mainstream in the future, and pedal torque control on the pedal shaft will be one of the main electric-assisted control methods.

The conventional pedal shaft with a hollow shaft does not have a double one-way transmission device, so the power transmission between the mid-mounted motor and the pedal will affect each other; if there is only one-way transmission between the pedal shaft and the hollow shaft device, the pedal torque will be affected by the hysteresis of the motor; if there is only a one-way transmission device between the motor power transmission and the hollow shaft, when the motor rotates, the pedal shaft will be forced to rotate synchronously with it, which will cause uncomfortable riding .

Another conventional electric bicycle, as shown in Figure 1, is provided with a hollow shaft 20 outside its pedal shaft 10, wherein the hollow shaft 20 is mainly combined with the motor and the pedal shaft through two one-way bearings respectively. , when accelerating or climbing, but the battery is not powered or the assist force of the electric motor is low, the pedal force is transmitted to the hollow shaft through the pedal shaft, and then the torque transmitted to the large chainring must be very large (about over 120Nm); at this time, if the existing one-way bearings in the market are used, the size and weight of one of the one-way bearings 30 will also be very large, which will not be able to meet the requirements of the product for small size and light weight.

In view of this, our inventors are concentrating on further research on electric bicycles, and proceeding to research and development and improvement, hoping to solve the above problems with a better invention, and after continuous testing and modification, the present invention comes out; The invention directly transforms the existing hollow shaft and pedal shaft, and cooperates with an intermeshing one-way clutch designed to increase the torque of pedal transmission, and has the effects of high strength, small size and light weight.

Yes, the purpose of the present invention is to solve the aforementioned problems. In order to achieve the above purpose, our inventors provide a one-way clutch for a bicycle axle, which includes: a hollow shaft and a pedal shaft, wherein the hollow shaft is sleeved On a pedal shaft; one end of the hollow shaft is formed with a one-way clutch part; and the pedal shaft is provided with a clutch unit corresponding to the one-way clutch part, so that the one-way clutch part of the hollow shaft and the pedal shaft The clutch units mesh with each other to form a one-way clutch; the one-way clutch of the present invention can increase the torque of pedal transmission, and has the effects of high strength, small size and light weight.

According to the above-mentioned one-way clutch in which the pedal shaft of the electric bicycle is connected with the hollow shaft, it can be designed as a side tooth type, and it is connected with the hollow shaft at the side edge to form the one-way clutch part. The one-way clutch part is a unidirectionally arranged tooth portion, the clutch unit is slidably arranged on the pedal shaft, the side edge of the clutch unit is formed with a tooth corresponding to the tooth portion, and the other end of the clutch unit is fixed with a The sleeve cover is provided with an elastic piece in the sleeve cover, and the elastic piece elastically resists the clutch unit.

According to the above-mentioned one-way clutch for the bicycle axle, the pedal axle is further provided with at least one recess, the recess is provided with a transmission block, and the clutch unit is provided with a chute corresponding to the transmission block.

According to the above-mentioned one-way clutch in which the pedal shaft of the electric bicycle is connected with the hollow shaft, it can be a pawl-type design, and the hollow shaft forms the one-way clutch part on its inner edge. The clutch part is a tooth portion arranged in one direction; the clutch unit includes elastic pawls arranged on the pedal shaft in an annular array and corresponding to the tooth portion.

According to the above-mentioned one-way clutch of the bicycle axle, wherein, the pedal axle is further provided with at least one groove in an annular array, the grooves are respectively provided with the elastic pawls, and one end of the elastic pawls is a convex extending on the surface of the pedal shaft and corresponding to the tooth portion.

According to the above-mentioned one-way clutch of the bicycle axle, it further includes an electric auxiliary motor, which is driven in one direction by a one-way transmission element and arranged on the hollow shaft; the hollow shaft is connected and driven on a large chainring , the power of the electric motor will be transmitted to the large chainring through the one-way transmission element and the hollow shaft in sequence, and the one-way clutch will form an idle rotation; and the power of the pedal will be transmitted to the one-way through the pedal shaft. The clutch is used to drive the large toothed plate through the hollow shaft, and at the same time, the one-way transmission element forms idle rotation; the power of the electric motor and the power of the pedal are not affected by each other during transmission. The electric auxiliary motor is arranged coaxially or non-coaxially with the hollow shaft.

By the above description and setting, it is obvious that the present invention mainly has the following advantages and effects, which are detailed as follows one by one:

1. Since there are two sources of power for electric bicycles to transmit power to the large chainring, one is the electric motor, and the other is pedal force. In order to allow the two different powers to be input to the large chainring without affecting each other, Therefore, the present invention is by adding the pedal shaft to the hollow shaft, one part of the hollow shaft is combined with the pedal shaft by a one-way clutch, and the other is connected with the electric motor by a one-way clutch or a one-way bearing; The rotation direction of the one-way clutch can achieve the effect that the pedal and the electric motor do not affect each other when driving, and by directly using and transforming the existing hollow shaft and the pedal shaft to cooperate with each other to design an intermeshing one-way clutch, it can also Increase the torque of pedal transmission, and have the effect of high strength, small size and light weight.

Regarding the technical means of our inventors, several preferred embodiments will be described in detail below in conjunction with the drawings, so as to provide an in-depth understanding and recognition of the present invention.

Please refer to Figures 2 to 7, the present invention is a one-way clutch of a bicycle axle, which includes:

A hollow shaft 1, which is sleeved on a pedal shaft 2; the hollow shaft 1 is formed with a one-way clutch part 11, and the hollow shaft 1 is used to connect and drive to a large toothed disc 3, and the large toothed disc 3 is It can be the front sprocket of the electric bicycle; and the pedal shaft 2 is provided with a clutch unit 21 corresponding to the one-way clutch part 11, so that the one-way clutch part 11 of the hollow shaft 1 and the pedal shaft 2 The clutch units 21 are engaged with each other and form a one-way clutch 4;

In one embodiment, the present invention is used to configure an electric auxiliary motor 5, which is driven in one direction by a one-way transmission element 51 and arranged on the hollow shaft 1; In the example, the system can be configured as a one-way bearing, or a one-way clutch device, but it is only an example and not a limitation.

As far as the configuration of the one-way clutch 4 is concerned, it is a side-tooth design in a specific embodiment. The hollow shaft 1 forms the one-way clutch part 11 at the side edge, and the one-way clutch part 11 is a one-way clutch part 11. The tooth portion provided, the clutch unit 21 is slidably arranged on the pedal shaft 2, the side edge of the clutch unit 21 is formed with a tooth piece 211 corresponding to the tooth portion, and the other end of the clutch unit 21 is fixed with a cover 212 , the sleeve cover 212 is provided with an elastic member 213, and the elastic member 213 is elastically resisted to the clutch unit 21; wherein, the sleeve cover 212 can be fixed against the wall inside the electric motor 5, or directly positioned In the pedal shaft 2, but it is only for illustration, not as a limitation; thereby, as shown in the 5th and 6th figures, between the clutch unit 21 and the one-way clutch part 11, when rotating in one direction, the Driven by the locking of the teeth and the teeth 211, and when the one-way clutch 4 rotates in the other direction, as shown in Figure 6, the clutch unit 21 will be pushed by the teeth to compress the elastic member 213, until the tooth part 211 breaks away from the tooth part, and then is pushed by the elasticity of the elastic part 213 to make the tooth part 211 and the tooth part re-engage, thereby repeating, the purpose of one-way clutch transmission can be achieved; and the present invention is directly Retrofitting the existing hollow shaft 1 and pedal shaft 2 with a one-way clutch 4 that is designed to engage with each other can increase the torque of the pedal transmission, and has the effects of high strength, small size and light weight.

As far as the configuration of the clutch unit 21 is concerned, in one embodiment, at least one recess 22 is further provided on the pedal shaft 2, and a transmission block 23 is provided in the recess 22, and a corresponding The chute 214 of the transmission block 23 is used to enable the pedal shaft 2 to be transmitted to the clutch unit 21 by the transmission block 23 in the direction of rotation, and for the idling displacement movement shown in Figures 5 and 6, Then it is available for the clutch unit 21 to limit and slide on the transmission block 23 through the chute 214;

And it must be particularly noted that the one-way transmission direction of the one-way clutch 4 is opposite to the one-way transmission direction of the one-way transmission element 51, so that both the power of the pedal and the power of the electric auxiliary motor 5 can drive the The electric bicycle moves forward, and the power does not affect each other, but it is only an example, not a limitation.

As far as the specific configuration of the electric motor 5, pedal shaft 2 and hollow shaft 1 is concerned, in one embodiment, the electric motor 5 is coaxially arranged with the hollow shaft 1, and in another embodiment, it can also be It is non-coaxially arranged; and the pedal shaft 2 and the hollow shaft 1 are passed through the multi-way tube of an electric bicycle; and the two ends of the pedal shaft 2 are respectively provided with a pedal crank (not shown in the figure), The pedal crank is used to install a pedal for the user to provide pedal force to the pedal shaft 2 .

Thereby, as shown in Fig. 7, when the electric assist motor 5 provides electric assist power, its power transmission path is transmitted to the large sprocket 3 through the one-way transmission element 51 and the hollow shaft 1 in sequence, so as to drive the Electric bicycle, at the same time, it will form idling to the one-way clutch 4, so it will not be transmitted to the pedal shaft 2, if it does not cause discomfort when riding or cause danger when riding.

As shown in Figure 8, when the user provides pedaling force in the forward direction, the power will be transmitted to the one-way clutch 4 via the pedal shaft 2, so as to be transmitted to the large chainring 3 via the hollow shaft 1 At the same time, the one-way transmission element 51 also forms idling, so it does not affect the power transmission of the electric motor 5; on the contrary, when the user provides the pedal force in the backward direction, the one-way clutch 4 will be directly idling, so it will not be affected either. Influence the transmission of the power of the electric motor 5, thereby, the effect that the power of the electric motor 5 and the power of the pedal can be independent of each other during transmission can be achieved; and through the pedal shaft 2 and the hollow shaft 1 Direct molding and forming the setting of the one-way clutch 4 make the torque of the present invention to transmit power stronger, and its strength is also higher, so the torsion that can be tolerated is larger, and it has the advantages of small size and light weight, so it can The overall volume and weight of the electric motor 5 are reduced, so as to achieve the purpose of light weight.

In addition, as far as the configuration of the one-way clutch 4 is concerned, in another embodiment, it can be a pawl-type design. As shown in Figures 9 to 12, the hollow shaft 1 forms the one-way clutch part on its inner edge 11, and the one-way clutch part 11 is a one-way set tooth; the clutch unit 21 includes a ring-shaped array arranged on the pedal shaft 2 and corresponding to the elastic pawl 24 of the tooth; thereby, through The elastic pawl 24 is set so that when rotating in a transmission direction, the tip of the elastic pawl 24 will be against the wall surface of the tooth portion, so that the mutual transmission can be carried out, and when rotating in an idling direction, the tooth portion will be elastically The top of the ratchet 24 compresses the elastic ratchet 24, so that the tip of the elastic ratchet 24 cannot touch the wall of the tooth portion and form an idle rotation, so as to achieve the purpose of one-way transmission; as far as its configuration is concerned, in a specific In the embodiment, the pedal shaft 2 is provided with at least one groove 25 in an annular array, and the grooves 25 are respectively provided with the elastic pawls 24, and one end of the elastic pawls 24 protrudes from the pedal The surface of the shaft 2 corresponds to the tooth portion; in this way, the aforementioned one-way transmission can also be achieved, and the power transmitted by the electric motor 5 and the power of the pedals do not affect each other. The implementation method is similar to the previous embodiment , and can achieve the same effect, so it will not be repeated here.

To sum up, the technical means disclosed in the present invention can effectively solve the problems of conventional knowledge and achieve the expected purpose and effect, and it has not been published in publications before application, has not been publicly used, and has long-term progress. The invention mentioned in the patent law is correct. I file an application according to the law. I sincerely pray that Junshang Hui will give you a detailed review and grant the invention patent. I am very grateful to Dexin.

However, the above are only several preferred embodiments of the present invention, and should not limit the scope of the present invention, that is, all equivalent changes and modifications made according to the patent scope of the present invention and the content of the description of the invention are all Should still belong to the scope covered by the patent of the present invention.

[Prior Art] 10: Pedal shaft 20: hollow shaft 30: One-way bearing [this invention] 1: hollow shaft 11: One-way clutch parts 2: Pedal shaft 21: clutch unit 211: tooth parts 212: cover 213: Elastic parts 214: Chute 22: Concave 23: Transmission block 24: elastic pawl 25: Groove 3: large tooth plate 4: One-way clutch 5: Electric motor 51: One-way transmission element

Fig. 1 is a sectional schematic diagram of a conventional electric bicycle pedal shaft and a hollow shaft equipped with a one-way bearing. Fig. 2 is a three-dimensional schematic view of the hollow shaft and pedal shaft of the present invention. Fig. 3 is a three-dimensional exploded schematic view of the hollow shaft and pedal shaft of the present invention. Figure 4 is a schematic cross-sectional view at position A-A of Figure 2. Figure 5 is a schematic side view of the present invention when the cover is removed. Figure 6 is a schematic side view of the present invention with the cover removed, and the elastic member compressed by the abutment of the teeth and the teeth. Fig. 7 is a sectional view of the configuration of the electric motor according to the present invention and a schematic diagram of the use state of the path for the power transmission of the electric motor. Fig. 8 is a cross-sectional view of the configuration of the electric motor according to the present invention and a schematic diagram of the use state of the path of pedal power transmission. Fig. 9 is a three-dimensional schematic diagram of another one-way clutch formed by the arrangement of another hollow shaft and pedal shaft according to the present invention. Fig. 10 is a three-dimensional exploded schematic diagram of Fig. 9. Figure 11 is a schematic cross-sectional view at the position BB of Figure 9. Fig. 12 is a schematic cross-sectional view at position C-C in Fig. 9.

1: hollow shaft 11: One-way clutch parts 2: Pedal shaft 21: clutch unit 211: tooth parts 212: cover 4: One-way clutch

Claims (7)

A one-way clutch for a bicycle axle, which includes: a hollow shaft and a pedal shaft, wherein the hollow shaft is sleeved on a pedal shaft; one end of the hollow shaft is formed with a one-way clutch part; and the pedal shaft is provided with Corresponding to the clutch unit of the one-way clutch part, the one-way clutch part of the hollow shaft and the clutch unit of the pedal shaft are engaged with each other to form a one-way clutch, and the hollow shaft is tied to the side edge to form the one-way The clutch part, the one-way clutch part is a one-way tooth part, the clutch unit is slidably arranged on the pedal shaft, the side edge of the clutch unit is formed with a tooth part corresponding to the tooth part, and the clutch unit is also A set of cover is fixed at one end, and an elastic piece is arranged in the cover, and the elastic piece is elastically resisted to the clutch unit. The one-way clutch of the bicycle axle as described in claim 1, wherein the pedal axle is further provided with at least one recess, the recess is provided with a transmission block, and the clutch unit is provided with a chute corresponding to the transmission block . The one-way clutch of the bicycle axle as described in claim 1, wherein, the hollow shaft forms the one-way clutch part on its inner edge, and the one-way clutch part is a tooth part provided in one direction; the clutch unit comprises The annular array is arranged on the pedal shaft and corresponds to the elastic pawls of the teeth. The one-way clutch of the bicycle axle according to claim 3, wherein the pedal axle is further provided with at least one groove in an annular array, the grooves are respectively provided with the elastic pawls, and one end of the elastic pawls The system protrudes from the surface of the pedal shaft and corresponds to the tooth portion. The one-way clutch of the bicycle axle as described in any one of claim 1 to claim 4 further includes an electric auxiliary motor, which is driven in one direction by a one-way transmission element and arranged on the hollow shaft; The hollow shaft is connected and transmitted to the large toothed plate, the power of the electric motor will be transmitted to the large toothed plate through the one-way transmission element and the hollow shaft in sequence, and the one-way clutch will form idling; and the power of the pedal will be through The pedal shaft is transmitted to the one-way clutch, so as to be transmitted to the large toothed plate through the hollow shaft, and at the same time, the one-way transmission element is formed to idle; so that the power of the electric motor and the power of the pedal are mutually mutually uninfluenced. The one-way clutch of the bicycle axle according to claim 5, wherein the electric motor is coaxially arranged with the hollow shaft. The one-way clutch of the bicycle axle according to claim 5, wherein the electric motor is not coaxially arranged with the hollow shaft.

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