One-way clutch and two-wheeler

Abstract

The invention discloses a one-way clutch and a two-wheeled vehicle, wherein the one-way clutch comprises a hub, a rotating shaft, and a coil spring, wherein the hub has an inner hole, the inner wall of the hub is provided with a plurality of inner bevel teeth arranged circumferentially, the rotating shaft is passed through the inner hole, the coil spring is located in the inner hole, the inner end of the coil spring is fixedly connected to the rotating shaft, the outer side wall of the coil spring away from the rotating shaft is provided with outer bevel teeth, when the rotating shaft rotates forward, the outer bevel teeth can mesh with the inner bevel teeth, when the rotating shaft reverses, the outer bevel teeth are disengaged from the inner bevel teeth. During the use of the one-way clutch, when the rotating shaft rotates forward, the outer bevel teeth mesh with the inner bevel teeth, the coil spring expands, the rotating shaft drives the hub through the coil spring, and the transmission function is realized; when the rotating shaft reverses, the inner bevel teeth push the coil spring to contract through the outer bevel teeth, so that the outer bevel teeth are disengaged from the inner bevel teeth, and the idling function is realized. The coil spring is used to replace the ratchet and the O-type steel wire spring, so as to simplify the assembly steps, and the coil spring has a long service life and high reliability, the outer bevel teeth and the inner bevel teeth mesh, the transmission is stable, and the idling stroke is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of clutches, and in particular to a one-way clutch and a two-wheeled vehicle. Background Art

[0002] In the related art, two-wheeled vehicles usually use the rear wheel as the driving wheel, such as bicycles and electric vehicles. The rear wheel has a one-way clutch to achieve one-way transmission to prevent falling due to reversing. At present, the commonly used one-way clutch is composed of a hub and a tower base, and adopts a ratchet and a pawl to cooperate with each other for transmission. The O-type steel wire spring provides support for the pawl, so that the pawl expands outward and toward the ratchet under normal conditions. The tower base rotates forward, the ratchet and the pawl engage, thereby driving the hub to rotate; the tower base rotates reversely, the ratchet and the pawl separate, and the tower base idles. However, the ratchet and pawl structure has the following shortcomings: 1. The contact area of ​​the pawl is small, and it is subjected to a large impact when engaged, the transmission stability is poor, the idling stroke is large, and the impact force is large; 2. There are many parts, the assembly is cumbersome, and the O-type steel wire spring may cause loosening and fatigue failure, and the structural reliability is not high. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a one-way clutch, which has the advantages of simple and reliable structure, stable transmission, small impact, etc.

[0004] The present invention also provides a two-wheeled vehicle using the one-way clutch.

[0005] According to an embodiment of the first aspect of the present invention, the one-way clutch includes a hub, a rotating shaft, and a coil spring. The hub has an inner hole, and the inner wall of the hub is provided with a plurality of circumferentially arranged inner bevel teeth. The rotating shaft passes through the inner hole, and the coil spring is located in the inner hole. The inner end of the coil spring is fixedly connected to the rotating shaft, and the outer side wall of the coil spring facing away from the rotating shaft is provided with outer bevel teeth. When the rotating shaft rotates forward, the outer bevel teeth can engage with the inner bevel teeth, and when the rotating shaft rotates reversely, the outer bevel teeth are disengaged from the inner bevel teeth.

[0006] The one-way clutch according to the first embodiment of the present invention has at least the following beneficial effects: during the use of the one-way clutch, when the shaft rotates forward, the outer bevel teeth mesh with the inner bevel teeth, the coil spring is expanded by force, and the shaft drives the hub through the coil spring to realize the transmission function; when the shaft rotates reversely, the inner bevel teeth push the coil spring to contract through the outer bevel teeth, so that the outer bevel teeth and the inner bevel teeth are separated to realize the idling function. The coil spring is used to replace the ratchet pawl and the O-type steel wire spring, which simplifies the assembly steps, and the coil spring has a long service life, is not easy to fail, and has high reliability. The outer bevel teeth and the inner bevel teeth are meshed, the transmission is smoother, and the idling stroke is reduced.

[0007] According to some embodiments of the first aspect of the present invention, a tooth groove is formed between two adjacent inner bevel teeth, and at least one outer bevel tooth near the outer end of the coil spring remains extended into the tooth groove.

[0008] According to some embodiments of the first aspect of the present invention, along the axial direction of the rotating shaft, the width dimension of the outer bevel teeth is greater than the width dimension of the inner bevel teeth.

[0009] According to some embodiments of the first aspect of the present invention, the inner bevel teeth have a meshing surface, the meshing surface is used to mesh with the outer bevel teeth, and the meshing surface is arranged along the radial direction of the hub.

[0010] According to some embodiments of the first aspect of the present invention, along the radial direction of the rotating shaft, the thickness of the coil spring is 2 mm to 6 mm.

[0011] According to some embodiments of the first aspect of the present invention, the number of the external bevel teeth is 5 to 120, and two adjacent external bevel teeth are connected.

[0012] According to some embodiments of the first aspect of the present invention, along the circumference of the rotating shaft, an angle occupied by the plurality of external bevel teeth is 180° to 270°.

[0013] According to some embodiments of the first aspect of the present invention, the tooth tops of the external bevel teeth are provided with chamfers.

[0014] According to some embodiments of the first aspect of the present invention, a retaining ring is provided on the end surface of the hub, and the retaining ring surrounds the inner bevel teeth.

[0015] According to some embodiments of the first aspect of the present invention, a through hole is provided at the inner end of the coil spring, a fastener is passed through the through hole, and the fastener is fixed to the rotating shaft.

[0016] According to some embodiments of the first aspect of the present invention, the rotating shaft and the coil spring are an integral structural component.

[0017] A two-wheeled vehicle according to a second embodiment of the present invention comprises the one-way clutch as described in the first embodiment.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Additional aspects and advantages of the present invention will become apparent and readily understood from the following description of embodiments in conjunction with the accompanying drawings, in which:

[0020] Figure 1 It is an exploded schematic diagram of a one-way clutch according to an embodiment of the first aspect of the present invention;

[0021] Figure 2 It is a schematic diagram of a one-way clutch according to a first embodiment of the present invention from a main perspective;

[0022] Figure 3 The state of the rotating shaft rotating in the first embodiment of the present invention is schematically shown. Figure 1 ;

[0023] Figure 4 The state of the rotating shaft rotating in the first embodiment of the present invention is schematically shown. Figure 2 ;

[0024] Figure 5 It is a schematic diagram of the state of the rotating shaft being reversed in the embodiment of the first aspect of the present invention;

[0025] Figure 6 for Figure 5 A local enlarged view of point A;

[0026] Figure 7 It is a schematic diagram of the exploded view of the rotating shaft and the coil spring in the embodiment of the first aspect of the present invention.

[0027] The figures are as follows:

[0028] Hub 100, inner hole 101, tooth groove 102, inner helical teeth 110, meshing surface 111, oblique pressure surface 112, retaining ring 120;

[0029] Rotating shaft 200;

[0030] Coil spring 300 , external oblique teeth 310 , and fastener 320 . DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0032] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] In the description of the present invention, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0034] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0035] In the related art, since a two-wheeled vehicle has only two wheels and cannot maintain stable support by itself, a one-way clutch is usually provided on the rear wheel (driving wheel) to achieve the functions of forward transmission and reverse idling.

[0036] The commonly used one-way clutch is composed of a hub and a freehub, and adopts a ratchet and pawl combination structure transmission. The O-type steel wire spring provides support for the pawl, so that the pawl remains in an outward expansion state under normal conditions, and the expanded pawl faces the ratchet and abuts against the ratchet. When the freehub rotates forward, the pawl engages with the ratchet, thereby driving the hub to rotate; when the freehub rotates reversely, the ratchet pushes the pawl to compress the O-type steel wire spring, so that the ratchet and pawl are separated, and the freehub idles. However, the ratchet and pawl structure has the following shortcomings: 1. The number of pawls is small, the contact area is small, the impact is large when meshing, the transmission stability is poor, the idle stroke is large, and the impact force is large; 2. There are many parts, the assembly is cumbersome, and the O-type steel wire spring may cause loosening and fatigue failure, and the structural reliability is not high; 3. When the freehub rotates reversely, the O-type steel wire spring pushes the pawl to expand, and the pawl and ratchet collide continuously, generating a lot of noise.

[0037] To this end, an embodiment of the first aspect of the present invention provides a one-way clutch applied to a two-wheeled vehicle, which can simplify the assembly steps, improve transmission stability, reduce idling stroke, and reduce the impact force of engagement and idling noise.

[0038] Reference Figures 1 to 6 The one-way clutch proposed in the first aspect of the embodiment of the present invention comprises a hub 100, a rotating shaft 200, and a coil spring 300. The hub 100 is the outer shell of the one-way clutch. Spokes are usually installed on the hub 100 to make a wheel hub. The hub 100 has an inner hole 101. The inner hole 101 penetrates the hub 100 along the axial direction of the hub 100, and the hub 100 is provided with a plurality of circumferentially arranged inner bevel teeth 110 on the inner wall of the inner hole 101. Usually, the plurality of inner bevel teeth 110 are evenly distributed along the circumference of the hub 100, so that the plurality of inner bevel teeth 110 are evenly distributed, and the stress on each part of the hub 100 is more evenly balanced.

[0039] It is understandable that the rotating shaft 200 is axially inserted into the inner hole 101, and the rotating shaft 200 and the hub 100 are rotatably connected, that is, the rotating shaft 200 can rotate freely relative to the hub 100. A bearing (not shown in the figure) is usually installed in the inner hole 101 of the hub 100, and the outer ring of the bearing is fixed to the inner wall of the inner hole 101. The rotating shaft 200 is fixed to the inner ring of the bearing, and the bearing is used to provide rotation support to meet the rotation requirements of the rotating shaft 200. It should be understood that the bearing model can be determined according to the stress state of the rotating shaft 200. When the rotating shaft 200 only bears radial force, a ball bearing can be selected. When the rotating shaft 200 bears radial force and axial force at the same time, a tapered roller bearing can be selected. It is also possible to select a combination of two tapered roller bearings, or a combination of a ball bearing and a tapered roller bearing.

[0040] It is understandable that the coil spring 300 is also arranged in the inner hole 101, the inner end of the coil spring 300 is fixedly connected to the rotating shaft 200, the outer end of the coil spring 300 is expanded along the radial direction of the rotating shaft 200, and an outer bevel tooth 310 is provided on the outer side wall of the coil spring 300 away from the rotating shaft 200. The shape of the outer bevel tooth 310 matches the shape of the inner bevel tooth 110, and the two can mesh. When the rotating shaft 200 rotates forward, the outer bevel tooth 310 meshes with the inner bevel tooth 110, and when the rotating shaft 200 rotates reversely, the outer bevel tooth 310 disengages from the inner bevel tooth 110. It should be understood that the forward and reverse rotation of the rotating shaft 200 are only used to distinguish the state, and the specific direction is not limited. Moreover, the hub 100 can also be an active component. When the hub 100 rotates forward, the outer bevel tooth 310 meshes with the inner bevel tooth 110, and when the hub 100 rotates reversely, the outer bevel tooth 310 disengages from the inner bevel tooth 110, which can also meet the use requirements of the one-way clutch.

[0041] The use process of the one-way clutch in the two-wheeled vehicle is as follows: when the two-wheeled vehicle needs to move forward, the rotating shaft 200 rotates forward, referring to Figure 3 and Figure 4 At this time, the outer bevel teeth 310 on the coil spring 300 mesh with the inner bevel teeth 110 of the hub 100, during which the coil spring 300 is stressed and expands outward, causing the outer bevel teeth 310 to mesh closely with the inner bevel teeth 110, and the coil spring 300 can transmit power, so the shaft 200 drives the hub 100 through the coil spring 300 to achieve the transmission function, and the two-wheeled vehicle can move forward; when the driving component of the two-wheeled vehicle reverses, the shaft 200 follows the reverse rotation, referring to Figure 5 At this time, the inner bevel gear 110 pushes the coil spring 300 to contract through the outer bevel gear 310, so that the outer bevel gear 310 is separated from the inner bevel gear 110, realizing the idling function of the shaft 200, and the hub 100 does not rotate with the shaft 200, thereby preventing the two-wheeled vehicle from reversing and falling.

[0042] The one-way clutch uses a coil spring 300 as a component for transmitting power. The coil spring 300 replaces the ratchet and the O-shaped wire spring, which simplifies the assembly steps of the one-way clutch and reduces the production cost. In addition, the coil spring 300 has a long service life, is not prone to failure, and has high reliability. A structure in which multiple outer bevel teeth 310 and multiple inner bevel teeth 110 are meshed can be used to improve transmission stability, reduce impact force, and reduce idling stroke.

[0043] It is understandable that the coil spring, also known as a spring, is a planar spiral spring made of spring steel that can continuously provide a large restoring force in a small space. In the one-way clutch, the self-reset ability of the coil spring 300 is used to keep the coil spring 300 in a normal state, satisfying the condition that the outer bevel teeth 310 and the inner bevel teeth 110 can mesh. When the shaft 200 rotates forward, the expansion ability of the coil spring 300 is used to make the outer bevel teeth 310 and the inner bevel teeth 110 mesh, so as to transmit power; when the shaft 200 rotates reversely, the contraction ability of the coil spring 300 is used to make the outer bevel teeth 310 and the inner bevel teeth 110 disengage.

[0044] Reference Figure 3 and Figure 4 It can be understood that the plurality of inner bevel teeth 110 are closely connected and arranged, and a tooth groove 102 is formed between two adjacent inner bevel teeth 110. When the outer bevel teeth 310 are engaged with the inner bevel teeth 110, the outer bevel teeth 310 are located in the tooth groove 102. In order to ensure that the outer bevel teeth 310 can be engaged with the inner bevel teeth 110 when the shaft 200 rotates forward, at least one outer bevel tooth 310 close to the outer end of the coil spring 300 is kept in the state of extending into the tooth groove 102, that is, in the normal state of the coil spring 300, at least one outer bevel tooth 310 is kept extending into the tooth groove 102. When the shaft 200 rotates forward, the inner bevel teeth 110 contact the outer bevel teeth 310 extending into the tooth groove 102, and then push the coil spring 300 to deform and expand outward, so that more outer bevel teeth 310 are engaged with the inner bevel teeth 110, which is beneficial to the transmission of power. Moreover, the deformation of the coil spring 300 will generate a reaction force, which can be used to buffer the contact between the coil spring 300 and the hub 100 and reduce the impact force, which is beneficial to increasing the service life of the one-way clutch. During the acceleration or braking of the two-wheeled vehicle, the deformation and reaction force of the coil spring 300 can be used to absorb the impact and reduce collision and wear.

[0045] It should be understood that in the one-way clutch, it is a better solution to keep the four outer bevel teeth 310 located in the tooth groove 102. When the shaft 200 rotates forward, the four outer bevel teeth 310 and the inner bevel teeth 110 quickly reach a meshing state to prevent slipping and make the transmission more stable.

[0046] It is understandable that, in the axial direction of the rotating shaft 200, the width dimension of the outer bevel teeth 310 is greater than the width dimension of the inner bevel teeth 110, and both ends of the width of the outer bevel teeth 310 are located outside the inner bevel teeth 110, so that when the outer bevel teeth 310 and the inner bevel teeth 110 are meshed, the outer bevel teeth 310 and the inner bevel teeth 110 can completely abut against each other, and have a large contact area, which is conducive to the transmission of power. Moreover, the width dimension of the coil spring 300 is consistent with the width dimension of the outer bevel teeth 310, and the coil spring 300 has a larger width dimension, which is conducive to improving the structural strength of the coil spring 300 and facilitating the transmission of power. During the assembly process, the precision requirement of the axial position of the coil spring 300 along the rotating shaft 200 is relatively low, which is convenient for assembly and reduces manufacturing costs.

[0047] Reference Figures 1 to 4 It can be understood that the inner bevel teeth 110 include a meshing surface 111 and a bevel pressure surface 112. The meshing surface 111 is used to mesh with the outer bevel teeth 310, and the meshing surface 111 is arranged along the radial direction of the hub 100. When the outer bevel teeth 310 mesh with the inner bevel teeth 110, the force between the outer bevel teeth 310 and the inner bevel teeth 110 is perpendicular to the meshing surface 111, which is conducive to transmitting power and making the transmission smoother.

[0048] Reference Figure 5 and Figure 6 It is understood that when the rotating shaft 200 is reversed, the oblique pressure surface 112 can contact the outer bevel teeth 310, thereby pushing the coil spring 300 to contract, so that the outer bevel teeth 310 and the inner bevel teeth 110 are separated, and the idling function is realized. The oblique pressure surface 112 and the meshing surface 111 form an angle. The larger the angle, the easier it is to achieve the separation of the outer bevel teeth 310 and the inner bevel teeth 110, but it will also cause the area of ​​the meshing surface 111 to decrease. Therefore, the angle can be set to 50° to 70°, of which 60° is a better solution, achieving a better balance between easy separation and power transmission.

[0049] It is understandable that in the radial direction of the rotating shaft 200, the thickness of the coil spring 300 is 2 mm to 6 mm, and the thickness of the coil spring 300 can be selected to be 2 mm, 3 mm, 4 mm, 5 mm or 6 mm, so that the coil spring 300 has sufficient structural strength to withstand torque and ensure that the one-way clutch can operate stably. At the same time, the coil spring 300 has sufficient thickness for processing the outer bevel teeth 310, so that the outer bevel teeth 310 have a certain thickness, reduce the risk of the outer bevel teeth 310 breaking, and improve the reliability of use.

[0050] It is understood that a plurality of external bevel teeth 310 are provided on the outer side wall of the coil spring 300, and the number of the external bevel teeth 310 is 5 to 120. For example, the coil spring 300 may be provided with 5 external bevel teeth 310, 10 external bevel teeth 310, 13 external bevel teeth 310, 20 external bevel teeth 310 or 120 external bevel teeth 310. The number of external bevel teeth 310 is set according to the actual use requirements of the one-way clutch. It should be understood that the larger the number of external bevel teeth 310, the larger the volume of the coil spring 300 is, so that sufficient space can be provided to accommodate the external bevel teeth 310. Therefore, the installation space of the one-way clutch is also one of the factors limiting the number of external bevel teeth 310. Two adjacent external bevel teeth 310 are connected, and the plurality of external bevel teeth 310 are closely arranged. When the shaft 200 is reversed and the external bevel teeth 310 are separated from the internal bevel teeth 110, the impact can be reduced and the noise can be reduced.

[0051] It is understandable that, in the circumferential direction of the rotating shaft 200, the angle occupied by the multiple external bevel teeth 310 is 180° to 270°, among which the angle occupied by 253° is a better solution. When the rotating shaft 200 rotates forward, the angle occupied by the area where the external bevel teeth 310 mesh with the internal bevel teeth 110 exceeds 100°, or even exceeds 180°, and the power that can be transmitted is relatively large, thereby improving the scope of use. It should be understood that the multiple external bevel teeth 310 do not necessarily all mesh with the internal bevel teeth 110. The unmeshed external bevel teeth 310 serve as a safety guarantee. In the event that the meshed external bevel teeth 310 are cracked, the unmeshed external bevel teeth 310 can enter a meshing state to ensure the contact and power transmission between the coil spring 300 and the hub 100.

[0052] Reference Figure 5 and Figure 6 It is understandable that a chamfer is provided at the tooth top of the external bevel tooth 310, and the chamfer can be a plane or an arc surface. By providing the chamfer, when the rotating shaft 200 is reversed, it is helpful to improve the collision between the external bevel tooth 310 and the inclined pressure surface 112, and at the same time reduce the stroke of the inclined pressure surface 112 pushing the coil spring 300 to contract, reduce the rebound force of the coil spring 300, and can reduce the noise generated by the collision. It should be understood that the tooth top of each external bevel tooth 310 can be provided with a chamfer, or the tooth top of some external bevel teeth 310 can be provided with a chamfer; the size and shape of each chamfer can be the same or different.

[0053] Reference Figure 1 It can be understood that a retaining ring 120 is provided on the end surface of the hub 100. The retaining ring 120 is annular and surrounds the inner bevel teeth 110 and the coil spring 300. In the one-way clutch, the retaining ring 120 can play a protective role. During the process of transporting the one-way clutch and assembling the one-way clutch to the two-wheeled vehicle, it can prevent other components from colliding with the outer bevel teeth 310 and the inner bevel teeth 110, thereby preventing damage caused by the collision.

[0054] Reference Figure 7 It can be understood that the inner end of the coil spring 300 is provided with a through hole (not shown in the figure), and a fastener 320 is inserted in the through hole. The fastener 320 is fixed to the rotating shaft 200, thereby fixing the inner end of the coil spring 300 to the rotating shaft 200. The fastener 320 can be a bolt, and the rotating shaft 200 is provided with a threaded hole matching the bolt. The bolt passes through the through hole and is tightened in the threaded hole to achieve the fixation of the coil spring 300 and the rotating shaft 200. The fastener 320 can also be a rivet, which can also achieve the fixation of the coil spring 300 and the rotating shaft 200.

[0055] It is understandable that the rotating shaft 200 and the coil spring 300 are an integral structure, for example, the rotating shaft 200 and the coil spring 300 are integrally cast, and then processed into a shape that meets the size and the outer bevel teeth 310. The inner end of the coil spring 300 can also be welded to the rotating shaft 200, and the rotating shaft 200 and the coil spring 300 are fixed as an integral structure.

[0056] The two-wheeled vehicle provided in the second embodiment of the present invention comprises the one-way clutch of the first embodiment, and the two-wheeled vehicle includes but is not limited to a bicycle, an electric bicycle, and an electric motorcycle. Usually, the one-way clutch is installed on the rear wheel of the two-wheeled vehicle, and the one-way clutch comprises a hub 100 and a rotating shaft 200. Taking a bicycle as an example, the rotating shaft 200 serves as the shaft of the rear wheel, and the hub 100 is a part of the wheel hub. The user drives the rotating shaft 200 by pedaling and chain. When the bicycle moves forward, the one-way clutch can transmit power, and the rear wheel rotates to realize forward movement.

[0057] The one-way clutch also includes a coil spring 300. The hub 100 has an inner hole 101, which penetrates the hub 100 along the axial direction of the hub 100. The hub 100 is provided with a plurality of circumferentially arranged inner bevel teeth 110 on the inner wall of the inner hole 101. Usually, the plurality of inner bevel teeth 110 are evenly distributed along the circumference of the hub 100, so that the plurality of inner bevel teeth 110 are evenly distributed, and the stress on each part of the hub 100 is more evenly balanced.

[0058] It is understandable that the rotating shaft 200 is axially inserted into the inner hole 101, and the rotating shaft 200 and the hub 100 are rotatably connected, that is, the rotating shaft 200 can rotate freely relative to the hub 100. A bearing (not shown in the figure) is usually installed in the inner hole 101 of the hub 100, and the outer ring of the bearing is fixed to the inner wall of the inner hole 101. The rotating shaft 200 is fixed to the inner ring of the bearing, and the bearing is used to provide rotation support to meet the rotation requirements of the rotating shaft 200. It should be understood that the bearing model can be determined according to the stress state of the rotating shaft 200. When the rotating shaft 200 only bears radial force, a ball bearing can be selected. When the rotating shaft 200 bears radial force and axial force at the same time, a tapered roller bearing can be selected. It is also possible to select a combination of two tapered roller bearings, or a combination of a ball bearing and a tapered roller bearing.

[0059] It is understandable that the coil spring 300 is also arranged in the inner hole 101, the inner end of the coil spring 300 is fixedly connected to the rotating shaft 200, the outer end of the coil spring 300 is expanded along the radial direction of the rotating shaft 200, and an outer bevel tooth 310 is provided on the outer side wall of the coil spring 300 away from the rotating shaft 200. The shape of the outer bevel tooth 310 matches the shape of the inner bevel tooth 110, and the two can mesh. When the rotating shaft 200 rotates forward, the outer bevel tooth 310 meshes with the inner bevel tooth 110, and when the rotating shaft 200 rotates reversely, the outer bevel tooth 310 disengages from the inner bevel tooth 110. It should be understood that the forward and reverse rotation of the rotating shaft 200 are only used to distinguish the state, and the specific direction is not limited. Moreover, the hub 100 can also be an active component. When the hub 100 rotates forward, the outer bevel tooth 310 meshes with the inner bevel tooth 110, and when the hub 100 rotates reversely, the outer bevel tooth 310 disengages from the inner bevel tooth 110, which can also meet the use requirements of the one-way clutch.

[0060] The use process of the one-way clutch in the two-wheeled vehicle is as follows: when the two-wheeled vehicle needs to move forward, the rotating shaft 200 rotates forward, referring to Figure 3 and Figure 4 At this time, the outer bevel teeth 310 on the coil spring 300 mesh with the inner bevel teeth 110 of the hub 100, during which the coil spring 300 is stressed and expands outward, causing the outer bevel teeth 310 to mesh closely with the inner bevel teeth 110, and the coil spring 300 can transmit power, so the shaft 200 drives the hub 100 through the coil spring 300 to achieve the transmission function, and the two-wheeled vehicle can move forward; when the driving component (pedal) of the two-wheeled vehicle reverses, the shaft 200 follows the reverse rotation, referring to Figure 5 At this time, the inner bevel gear 110 pushes the coil spring 300 to contract through the outer bevel gear 310, so that the outer bevel gear 310 is separated from the inner bevel gear 110, realizing the idling function of the shaft 200, and the hub 100 does not rotate with the shaft 200, thereby preventing the two-wheeled vehicle from reversing and falling.

[0061] The one-way clutch uses a coil spring 300 as a component for transmitting power. The coil spring 300 replaces the ratchet and the O-shaped wire spring, which simplifies the assembly steps of the one-way clutch and reduces the production cost. In addition, the coil spring 300 has a long service life, is not prone to failure, and has high reliability. A structure in which multiple outer bevel teeth 310 and multiple inner bevel teeth 110 are meshed can be used to improve transmission stability, reduce impact force, and reduce idling stroke.

[0062] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A one-way clutch for transmission, characterized in that: include: A hub, wherein the hub has an inner hole, and an inner wall of the hub is provided with a plurality of inner bevel teeth arranged circumferentially; A rotating shaft is passed through the inner hole; A coil spring is located in the inner hole, the inner end of the coil spring is fixedly connected to the rotating shaft, and the outer side wall of the coil spring facing away from the rotating shaft is provided with a plurality of external bevel teeth. When the rotating shaft rotates forward, the external bevel teeth can engage with the internal bevel teeth, and when the rotating shaft rotates reversely, the external bevel teeth are disengaged from the internal bevel teeth; a tooth groove is formed between two adjacent internal bevel teeth, and at least one of the external bevel teeth close to the outer end of the coil spring remains extended into the tooth groove.

2. The one-way clutch for transmission according to claim 1, characterized in that: Along the axial direction of the rotating shaft, the width dimension of the outer bevel teeth is greater than the width dimension of the inner bevel teeth.

3. The one-way clutch for transmission according to claim 1 or 2, characterized in that: The inner bevel teeth have a meshing surface, and the meshing surface is used to cooperate with the outer bevel teeth to achieve meshing. The meshing surface is arranged along the radial direction of the hub.

4. The one-way clutch for transmission according to claim 1, characterized in that: Along the radial direction of the rotating shaft, the thickness of the coil spring is 2 mm to 6 mm.

5. The one-way clutch for transmission according to claim 1, characterized in that: The number of the external bevel teeth is 5 to 120, and two adjacent external bevel teeth are connected.

6. The one-way clutch for transmission according to claim 5, characterized in that: Along the circumference of the rotating shaft, the angle occupied by the plurality of external oblique teeth is 180° to 270°.

7. The one-way clutch for transmission according to claim 1, characterized in that: The tooth tops of the external helical teeth are provided with chamfers.

8. The one-way clutch for transmission according to claim 1, characterized in that: The end surface of the hub is provided with a retaining ring, and the retaining ring surrounds the inner bevel teeth.

9. The one-way clutch for transmission according to claim 1, characterized in that: A through hole is arranged at the inner end of the coil spring, a fastener is passed through the through hole, and the fastener is fixed to the rotating shaft.

10. The one-way clutch for transmission according to claim 1, characterized in that: The rotating shaft and the coil spring are an integral structural component.

11. A two-wheeled vehicle, characterized in that: The invention comprises a one-way clutch for transmission as claimed in any one of claims 1 to 10.

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