Overrunning clutch and inner variable speed hub
The overrunning clutch with ratchet teeth and preload members in bicycle hubs provides fast torque response and high torque capacity, along with loud sliding sounds, addressing the limitations of existing hubs.
Patent Information
- Application Number
- CN202420940560.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-03
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-05-03
AI Technical Summary
Existing bicycle hubs with overrunning clutches have slow torque response speed, low torque capacity, and produce low noise during sliding, which limits their performance and user experience.
An overrunning clutch with a ratchet structure featuring first and second ratchets with opposite triangular teeth, a preload member (either a compression spring or magnet assembly) to ensure engagement, and a sound amplification cavity to produce loud sounds during sliding.
The solution achieves extremely short engagement speed, fast response, high torque capacity, and produces dense, crisp, loud sounds during sliding, enhancing the bicycle's performance and user feedback.
Smart Images
Figure CN222141837U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of overrunning clutches, in particular to an overrunning clutch and an internal speed-changing hub. Background Art
[0002] Bicycles are a common means of commuting. Riders drive the bicycle forward by pedaling. When the rider is not pedaling, the bicycle relies on its own inertia to glide without rotating the sprocket, chain and pedals. This function is achieved by setting a clutch in the bicycle hub.
[0003] Chinese patent document CN219256947U discloses a bicycle rear hub assembly, which realizes the unidirectional transmission function by using a freewheel base body to unidirectionally rotate and mesh with the inner teeth of the hub body through a pawl. Then, the number of pawls is small, the torque response speed transmitted to the hub by the rider's sudden pedaling is slow, and the noise is low during sliding.
[0004] Therefore, the existing technology needs to be improved and developed. Utility Model Content
[0005] The purpose of the present application is to provide an overrunning clutch and an internal speed-changing hub, which have an extremely short engagement speed, a fast response speed, and can carry a large torque, and can emit dense, crisp, and loud sounds during sliding.
[0006] In order to solve the above technical problems, the present application provides an overrunning clutch, including a first clutch assembly and a second clutch assembly, the first clutch assembly is provided with a first ratchet, the second clutch assembly is provided with a second ratchet, when the rotation speed of the first clutch assembly is higher than the rotation speed of the second clutch assembly, the first ratchet and the second ratchet are engaged, when the rotation speed of the first clutch assembly is not higher than the rotation speed of the second clutch assembly, the first ratchet and the second ratchet are disengaged.
[0007] Further, the first ratchet teeth of the first clutch assembly are arranged opposite to the second ratchet teeth of the second clutch assembly.
[0008] Furthermore, the second clutch assembly can move linearly along its axial direction to move away from or closer to the first clutch assembly.
[0009] Furthermore, it also includes a pre-tightening member, which is connected to the second clutch assembly and acts on the second clutch assembly to make the first ratchet and the second ratchet tend to engage.
[0010] Furthermore, the preload member is a compression spring, one end of the compression spring abuts against a fixed end, and the other end of the compression spring abuts against the first clutch assembly or the second clutch assembly.
[0011] Furthermore, the preload member is a magnet assembly, and the magnet assembly includes a first magnet and a second magnet with opposite polarities, the second magnet is connected to a fixed end, and the first magnet is connected to the first clutch assembly or the second clutch assembly.
[0012] Furthermore, the tooth shapes of the first ratchet tooth and the second ratchet tooth are triangular.
[0013] The present application also provides an internal speed hub, comprising the above-mentioned overrunning clutch, including an input member for inputting torque, an output member for outputting torque, and a transmission mechanism with at least two transmission ratios, wherein the input member is fixedly connected to the transmission mechanism; the overrunning clutch is arranged between the transmission mechanism and the output member, the first clutch assembly is fixedly connected to the output member, and the second clutch assembly is movably connected to the transmission mechanism, when the rotation speed of the output member is not higher than the rotation speed of the transmission mechanism, the overrunning clutch engages to transmit the torque of the transmission mechanism to the output member, and when the rotation speed of the output member is higher than the rotation speed of the transmission mechanism, the overrunning clutch disengages to interrupt the torque transmission.
[0014] Furthermore, the transmission mechanism is a planetary gear mechanism, which includes a ring gear, a planetary carrier, planetary gears, and a sun gear. The first clutch assembly is fixedly connected to the output member, the second clutch assembly is provided with a second connecting portion, the ring gear is provided with a first connecting portion, and the second connecting portion of the second clutch assembly and the first connecting portion of the ring gear are slidingly connected.
[0015] Further, the first connecting portion has a decomposition surface, the decomposition surface is inclined to the axis of the gear ring, and the torque of the gear ring is decomposed to the second ratchet teeth through the decomposition surface so that the first ratchet teeth and the second ratchet teeth remain engaged.
[0016] Furthermore, a sound amplification cavity is formed between the ring gear and the output member.
[0017] As can be seen from the above, the overrunning clutch adopts a ratchet structure, and multiple first ratchets and second ratchets transmit torque together, the engagement speed is extremely short, the response speed is fast, and the torque that can be carried is large. During sliding, the first ratchets and the second ratchets collide with each other to produce dense, crisp, and loud sounds.
[0018] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or be understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a stereoscopic view of the internal speed hub of Example 1.
[0020] Figure 2 It is a longitudinal sectional view of the internal speed hub of Example 1.
[0021] Figure 3 This is an exploded view of the speed-changing hub in Example 1.
[0022] Figure 4 This is a three-dimensional diagram of the first clutch assembly of Example 1.
[0023] Figure 5 This is a three-dimensional diagram of the second clutch assembly of Example 1.
[0024] Figure 6 Schematic diagram of the structure of the overrunning clutch of Example 1 (engaged state).
[0025] Figure 7 Schematic diagram of the structure of the overrunning clutch of Example 1 (disengaged state).
[0026] Figure 8 Schematic diagram of the structure of the overrunning clutch of Example 2 (engaged state).
[0027] Fig. 9 Schematic diagram of the structure of the overrunning clutch of Example 2 (disengaged state).
[0028] Fig.10 It is a stereoscopic view of the gear ring of Example 3.
[0029] Fig.11 It is a top view of the gear ring of embodiment 3.
[0030] Explanation of reference numerals: 1-input member, 2-output member, 3-transmission mechanism, 31-gear ring, 311-first connecting portion, 3111-decomposition surface, 4-overrunning clutch, 41-first clutch assembly, 411-first ratchet, 412-side wall, 42-second clutch assembly, 421-second ratchet, 422-second connecting portion, 43-preload member, 431-compression spring, 432-magnet assembly, 4321-first magnet, 4322-second magnet, 5-sound amplification chamber. DETAILED DESCRIPTION
[0031] The embodiments of the present invention are described in detail below, and examples of the embodiments 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 utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.
[0033] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0034] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.
[0035] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the utility model. In addition, the utility model may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the utility model provides various specific examples of processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials. Example 1
[0036] Figure 1 This is a three-dimensional image of the internal gear hub. Figure 2 : is a longitudinal sectional view of the internal speed hub. The internal speed hub comprises an input member 1 for inputting torque, an output member 2 for outputting torque, and a transmission mechanism 3 having at least two transmission ratios, wherein the input member 1 is fixedly connected to the transmission mechanism 3. In this embodiment, the transmission mechanism 3 is a planetary gear mechanism, and the transmission mechanism 3 comprises a ring gear 31, a planet carrier, planetary gears, and a sun gear. The input member 1 is fixedly connected to the planet carrier. The transmission mechanism 3 of the internal speed hub can be referred to Chinese patent document CN116353248A, which will not be described in detail here.
[0037] In order to enable the rider to transmit power to the output member 2 when pedaling, and the output member 2 does not rotate with the sprocket, chain and pedals when gliding, an overrunning clutch 4 is provided between the transmission mechanism 3 and the output member 2 .
[0038] Figure 3 The overrunning clutch 4 comprises a first clutch assembly 41 and a second clutch assembly 42. Figure 4 4 is a three-dimensional diagram of the first clutch assembly 41. The first clutch assembly 41 is provided with a first ratchet 411, and the first clutch assembly 41 is also provided with a side wall 412, and the side wall 412 is used for being fastened to the inner wall of the output member 2. Figure 5 It is a stereoscopic view of the second clutch assembly 42. The second clutch assembly 42 is provided with a second ratchet 421. The first ratchet 411 of the first clutch assembly 41 and the second ratchet 421 of the second clutch assembly 42 are arranged opposite to each other and have the same tooth shape, both of which are triangles, but the tooth shape of the first ratchet 411 and the tooth shape of the second ratchet 421 are in opposite directions. Preferably, the tooth shape of the first ratchet 411 and the second ratchet 421 can be a right triangle. When the rotation speed of the first clutch assembly 41 is higher than the rotation speed of the second clutch assembly 42, the first ratchet 411 and the second ratchet 421 are engaged, and when the rotation speed of the first clutch assembly 41 is not higher than the rotation speed of the second clutch assembly 42, the first ratchet 411 and the second ratchet 421 are separated.
[0039] In order to make the first ratchet teeth 411 and the second ratchet teeth 421 have a tendency to engage, a pre-tightening member 43 is further included. The pre-tightening member 43 is connected to the second clutch assembly 42 and acts on the second clutch assembly 42 .
[0040] The preload member 43 may be a compression spring 431 or a magnet assembly 432. In this embodiment, the preload member 43 is a compression spring 431, one end of the compression spring 431 abuts against the fixed end, and the other end of the compression spring 431 abuts against the first clutch assembly 41 or the second clutch assembly 42. The fixed end may be any part of the internal gear hub that does not move axially, and may be the gear ring 31 of the transmission mechanism 3.
[0041] The first clutch assembly 41 is fixedly connected to the output member 2, and the second clutch assembly 42 is movably connected to the transmission mechanism 3. Figure 5 As shown, the inner circumference of the second clutch assembly 42 is provided with a second connection portion 422, and correspondingly, the gear ring 31 of the transmission mechanism 3 is provided with a first connection portion 311, and the second connection portion 422 of the second clutch assembly 42 is slidably connected to the first connection portion 311 of the gear ring 31. The first connection portion 311 may be a spline, and the second connection portion 422 may be a spline groove, and the second clutch assembly 42 may move linearly along its axial direction to move away from or close to the first clutch assembly 41.
[0042] Figure 6 It is a schematic structural diagram of the overrunning clutch 4 (engaged state).
[0043] When the bicycle is pedaling, torque is input to the input member 1, which is transmitted to the gear ring 31 of the transmission mechanism 3 to output torque. Since the gear ring 31 and the second clutch assembly 42 are connected by sliding, they have the same rotation speed and rotate along the direction D2. At this time, the rotation speed of the output member 2 is not higher than the rotation speed of the transmission mechanism 3, that is, the output member 2 rotates along the direction D1 but the rotation speed is not higher than the rotation speed of the gear ring 31. Under the action of the preload member 43, the first ratchet 411 of the first clutch assembly 41 and the second ratchet 421 of the second clutch assembly 42 are engaged, that is, the overrunning clutch 4 is engaged. After the overrunning clutch 4 is engaged, the rotation speed of the first clutch assembly 41 and the rotation speed of the second clutch assembly 42 are the same, so as to transmit the torque of the transmission mechanism 3 to the output member 2.
[0044] When the overrunning clutch 4 is engaged, the plurality of first ratchet teeth 411 and the second ratchet teeth 421 transmit torque together, the engagement speed is extremely short, the response speed is fast, and the torque that can be carried is large.
[0045] Figure 7 It is a schematic structural diagram of the overrunning clutch 4 (disengaged state).
[0046] When the bicycle is gliding, there is no torque input to the input member 1, the rotation speed of the ring gear 31 is zero, and the output member 2 drives the first clutch assembly 41 to rotate along the direction D1. The tooth shape of the first ratchet 411 of the first clutch assembly 41 has an inclined surface, which can overcome the elastic force of the compression spring 431 to push the second ratchet 421 of the second clutch assembly 42 to separate the first ratchet 411 and the second ratchet 421, that is, the overrunning clutch 4 is separated. After the overrunning clutch 4 is separated, the torque of the output member 2 is interrupted and transmitted to the transmission mechanism 3, and the bicycle has very little resistance during gliding.
[0047] During the sliding, the first ratchet teeth 411 and the second ratchet teeth 421 collide with each other to produce dense, crisp and loud sounds.
[0048] In order to increase the sound during sliding, a sound amplification cavity 5 is formed between the gear ring 31 and the output member 2. There is a certain gap between the outer circumference of the gear ring 31 and the inner circumference of the output member 2, such as Figure 2 As shown, it is trumpet-shaped from left to right, which can increase the sound produced by the collision between the first ratchet tooth 411 and the second ratchet tooth 421. Example 2
[0049] Figure 8 It is a schematic structural diagram of the overrunning clutch 4 of Example 2 (engaged state). Fig. 9 It is a schematic structural diagram of the overrunning clutch 4 of Example 2 (disengaged state).
[0050] Different from the first embodiment, the pre-tightening member 43 is a magnet assembly 432, which includes a first magnet 4321 and a second magnet 4322 with opposite polarities, the second magnet 4322 is connected to the fixed end, and the first magnet 4321 is connected to the first clutch assembly 41 or the second clutch assembly 42. Figure 8 and Fig. 9 As shown, polarity relative means that the S pole of the first magnet 4321 is relative to the S pole of the second magnet 4322, or the N pole of the first magnet 4321 is relative to the N pole of the second magnet 4322. According to the magnetic field, the same poles repel each other and the opposite poles attract each other, and the second magnet 4322 will generate a repulsive force on the first magnet 4321 and act on the second clutch assembly 42. The working principle of the overrunning clutch 4 using the magnet assembly 432 is consistent with the principle of using the compression spring 431, and will not be repeated. The advantage is that the magnet assembly 432 is non-contact, and there is no problem of wear and tear reducing performance. Example 3
[0051] Fig.10 It is a three-dimensional diagram of the ring gear 31 of the third embodiment. Fig.11FIG. 3 is a top view of the gear ring 31 of Embodiment 3. After the overrunning clutch 4 is engaged, in order to increase the engagement force and prevent the first ratchet 411 and the second ratchet 421 from separating and slipping during riding, a decomposition surface 3111 is provided on the first connecting portion 311, and the decomposition surface 3111 is inclined to the axis of the gear ring 31, as shown in FIG. Fig.11 As shown, the inclination angle is α, and the torque of the ring gear 31 is decomposed to the second ratchet teeth 421 through the decomposition surface 3111 so that the first ratchet teeth 411 and the second ratchet teeth 421 remain engaged.
[0052] In the description of this specification, the description with reference to the terms "one embodiment", "certain embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0053] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, and these all belong to the protection scope of the present invention.
Claims
1. An overrunning clutch, characterized in that: The invention comprises a first clutch assembly (41) and a second clutch assembly (42); the first clutch assembly (41) is provided with a first ratchet tooth (411), and the second clutch assembly (42) is provided with a second ratchet tooth (421); when the rotation speed of the first clutch assembly (41) is higher than the rotation speed of the second clutch assembly (42), the first ratchet tooth (411) and the second ratchet tooth (421) are engaged; when the rotation speed of the first clutch assembly (41) is not higher than the rotation speed of the second clutch assembly (42), the first ratchet tooth (411) and the second ratchet tooth (421) are separated.
2. The overrunning clutch according to claim 1, characterized in that: The first ratchet teeth (411) of the first clutch assembly (41) and the second ratchet teeth (421) of the second clutch assembly (42) are arranged opposite to each other.
3. The overrunning clutch according to claim 1, characterized in that: The second clutch assembly (42) can move linearly along its axial direction to move away from or closer to the first clutch assembly (41).
4. The overrunning clutch according to claim 1, characterized in that: The invention also comprises a pre-tightening member (43), wherein the pre-tightening member (43) is connected to the second clutch assembly (42) and acts on the second clutch assembly (42) so that the first ratchet tooth (411) and the second ratchet tooth (421) have a tendency to engage.
5. The overrunning clutch according to claim 4, characterized in that: The preload member (43) is a compression spring (431), one end of the compression spring (431) abuts against a fixed end, and the other end of the compression spring (431) abuts against the first clutch assembly (41) or the second clutch assembly (42).
6. The overrunning clutch according to claim 4, characterized in that: The preload member (43) is a magnet assembly (432), and the magnet assembly (432) includes a first magnet (4321) and a second magnet (4322) with opposite polarities, the second magnet (4322) is connected to a fixed end, and the first magnet (4321) is connected to the first clutch assembly (41) or the second clutch assembly (42).
7. The overrunning clutch according to claim 1, characterized in that: The tooth shapes of the first ratchet tooth (411) and the second ratchet tooth (421) are triangular.
8. An internal gear hub, characterized in that: The overrunning clutch (4) comprises an input member (1) for inputting torque, an output member (2) for outputting torque, and a transmission mechanism (3) having at least two transmission ratios, wherein the input member (1) is fixedly connected to the transmission mechanism (3); the overrunning clutch (4) is arranged between the transmission mechanism (3) and the output member (2), the first clutch assembly (41) is fixedly connected to the output member (2), the second clutch assembly (42) is movably connected to the transmission mechanism (3), the overrunning clutch (4) is engaged to transmit the torque of the transmission mechanism (3) to the output member (2) when the rotation speed of the output member (2) is not higher than the rotation speed of the transmission mechanism (3), and the overrunning clutch (4) is disengaged to interrupt the torque transmission when the rotation speed of the output member (2) is higher than the rotation speed of the transmission mechanism (3).
9. The internal gear hub according to claim 8, characterized in that: The transmission mechanism (3) is a planetary gear mechanism, comprising a ring gear (31), a planet carrier, planetary gears, and a sun gear; the first clutch assembly (41) is fixedly connected to the output member (2); the second clutch assembly (42) is provided with a second connecting portion (422); the ring gear (31) is provided with a first connecting portion (311); the second connecting portion (422) of the second clutch assembly (42) and the first connecting portion (311) of the ring gear (31) are slidably connected.
10. The internal gear hub according to claim 9, characterized in that: The first connecting portion (311) has a decomposition surface (3111), which is inclined to the axis of the ring gear (31), and the torque of the ring gear (31) is decomposed to the second ratchet tooth (421) through the decomposition surface (3111) so that the first ratchet tooth (411) and the second ratchet tooth (421) remain engaged.
11. The internal gear hub according to claim 9, characterized in that: A sound amplification cavity (5) is formed between the gear ring (31) and the output member (2).