Silencer, ratchet pawl clutch assembly, transmission device and vehicle

Abstract

The application discloses a sound attenuation piece, a ratchet pawl clutch assembly, a speed changing device and a vehicle, and relates to the field of transmission devices.The technical scheme points of the application include an arc-shaped limiting sheet arranged between a clutch inner ring and a ratchet wheel.The arc-shaped limiting sheet has a first position and a second position relative to the clutch inner ring.In the first position, the pawl can be lifted to engage with the ratchet wheel.In the second position, the arc-shaped limiting sheet presses the pawl, so that the pawl is separated from the ratchet wheel.A resilient lug plate is arranged on the arc-shaped limiting sheet, and the resilient lug plate protrudes radially outward from the outer wall of the arc-shaped limiting sheet.The ratchet wheel can contact the resilient lug plate and drive the arc-shaped limiting sheet to rotate circumferentially between the first position and the second position relative to the clutch inner ring.In the application, when the ratchet pawl clutch assembly enters an overrun state, the sound attenuation piece is driven to rotate by the ratchet wheel, the sound attenuation piece presses the pawl, so that the pawl is separated from the ratchet wheel, thereby avoiding the ticking noise caused by the contact between the ratchet wheel and the pawl, and optimizing the riding experience.

Description

Technical Field

[0001] This invention relates to the field of transmission devices, and more specifically, to a muffler, a ratchet and pawl clutch assembly, a transmission device, and a vehicle. Background Technology

[0002] In transmission systems, the overrunning property of ratchet-pawl clutch assemblies is typically used to arrange multiple gears. For example, Chinese Patent No. CN216734649U discloses an integrated structure of a centrifugal clutch assembly and an automatic transmission hub with a large gear ratio. Another example is Chinese Patent No. CN208882034U, which discloses a centrifugal clutch assembly for a transmission hub and an automatic internal three-speed hub.

[0003] Both of the aforementioned patented shift hubs are automatic internal gearboxes. When the shift hub shifts into second or third gear, the ratchet-pawl clutch assembly in first gear is in an overrunning state. At this time, the ratchet rotates relative to the inner clutch ring and intermittently and continuously presses against the pawl, causing the pawl to intermittently spring back and engage with the ratchet. However, this results in a continuous ticking noise, affecting the riding experience. Summary of the Invention

[0004] To address the shortcomings of existing technologies, one of the objectives of this invention is to provide a noise-reducing component. When the ratchet and pawl clutch assembly enters the overrunning state, the ratchet drives the noise-reducing component to rotate, and the noise-reducing component presses down on the pawl, causing the pawl to separate from the ratchet. This avoids the ticking noise caused by the ratchet and pawl contacting each other, thus optimizing the riding experience.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A noise reduction component is used in a ratchet and pawl clutch assembly, the ratchet and pawl clutch assembly including a clutch inner ring, a pawl and a ratchet, and the noise reduction component including an arc-shaped limiting piece disposed between the clutch inner ring and the ratchet.

[0007] A circumferential limiting structure is provided between the muffler and the inner clutch ring, so that the arc-shaped limiting piece has a first position and a second position relative to the inner clutch ring; in the first position, the pawl can be raised to engage with the ratchet; in the second position, the arc-shaped limiting piece presses down on the pawl, so that the pawl separates from the ratchet.

[0008] The arc-shaped limiting piece is provided with an elastic protrusion plate, which protrudes radially from the arc-shaped limiting piece.

[0009] The ratchet can contact the elastic convex plate and drive the arc-shaped limiting plate to rotate circumferentially relative to the inner clutch ring between the first position and the second position.

[0010] Furthermore, the elastic convex plate has a radially highest point relative to the arc-shaped limiting piece; the inner wall of the ratchet is provided with ratchet teeth evenly distributed in the circumferential direction; the radially highest point is separated from the ratchet, at which time the radially highest point is located between two adjacent ratchet teeth, and the radially highest point does not contact the inner wall of the ratchet or the two ratchet teeth.

[0011] Furthermore, one end of the elastic protrusion is connected to the arc-shaped limiting piece along the circumferential direction, and the other end along the circumferential direction is a free end.

[0012] Furthermore, the free end of the elastic protrusion contacts the outer wall of the clutch inner ring.

[0013] Furthermore, the outer wall of the elastic convex plate is formed with a guide slope and a guide arc surface that connects with the guide slope; the guide slope connects to the outer wall of the arc-shaped limiting piece, and the highest radial point is located on the guide arc surface.

[0014] Furthermore, the circumferential limiting structure includes a circumferential limiting protrusion disposed on the inner sidewall of the arc-shaped limiting piece, and a limiting groove disposed on the outer sidewall of the clutch inner ring and cooperating with the circumferential limiting protrusion.

[0015] Furthermore, an axial limiting structure is provided between the muffler and the clutch inner ring, so that the axial position of the muffler relative to the clutch inner ring remains unchanged.

[0016] Furthermore, the ratchet and pawl clutch assembly also includes an elastic retaining ring and a retaining groove disposed on the inner clutch ring and cooperating with the elastic retaining ring; the axial limiting structure includes an axial limiting protrusion disposed on the inner sidewall of the arc-shaped limiting piece and cooperating with the retaining groove.

[0017] Furthermore, the ratchet pawl clutch assembly includes a plurality of pawls arranged circumferentially, and the muffler includes a plurality of arc-shaped limiting plates that respectively cooperate with the pawls.

[0018] Furthermore, the silencing component also includes a positioning ring plate, and each of the arc-shaped limiting pieces is connected to the positioning ring plate.

[0019] Furthermore, the positioning ring plate is located on the axial side of the clutch inner ring, and the circumferential limiting structure is formed between the positioning ring plate and the end face of the clutch inner ring.

[0020] Furthermore, the circumferential limiting structure includes a circumferential limiting protrusion disposed on the inner end face of the positioning ring plate, and a limiting groove disposed on the end face of the clutch inner ring and cooperating with the circumferential limiting protrusion.

[0021] Another object of the present invention is to provide a ratchet and pawl clutch assembly, which includes the above-mentioned muffler.

[0022] Another object of the present invention is to provide a speed change device comprising the above-described ratchet and pawl clutch assembly.

[0023] Another object of the present invention is to provide a vehicle that includes the above-described transmission device.

[0024] In summary, the present invention has the following beneficial effects:

[0025] 1. When the ratchet and pawl clutch assembly enters the overrunning state, the ratchet drives the muffler to rotate, and the muffler presses down on the pawl, causing the pawl to separate from the ratchet. This avoids the ticking noise caused by the ratchet and pawl contacting each other, thus optimizing the riding experience. Moreover, the rotation of the muffler is controlled by the ratchet, achieving automatic adjustment without the need for the rider to operate the bicycle.

[0026] 2. By placing the arc-shaped limiting plate in the limited radial space between the inner ring of the clutch and the ratchet, and placing the positioning ring plate on the axial side of the inner ring of the clutch, assembly can be facilitated, and the impact on the size of the ratchet clutch assembly can be reduced or even eliminated, thereby facilitating modification and reducing production costs. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the silencer component in Example 1;

[0028] Figure 2 This is a schematic diagram of the structure of the muffler and ratchet in Example 1;

[0029] Figure 3 This is a schematic diagram of the ratchet and pawl clutch assembly in Example 2. Figure 1 ;

[0030] Figure 4 This is a schematic diagram of the ratchet and pawl clutch assembly in Example 2. Figure 2 ;

[0031] Figure 5 This is a schematic diagram of the ratchet and pawl clutch assembly in Example 2. Figure 3 ;

[0032] Figure 6 This is a schematic diagram of the speed change device in Example 3.

[0033] In the diagram: 11. Arc-shaped limiting plate; 111. Clearance hole; 12. Elastic convex plate; 121. Guide slope; 122. Guide arc surface; 13. Axial limiting protrusion; 14. Positioning ring plate; 15. Circumferential limiting protrusion; 2. Clutch inner ring; 21. Slot; 22. Limiting groove; 3. Pawl; 4. Ratchet; 41. Ratchet tooth; 5. Central shaft; 6. Output housing. Implementation

[0034] The present invention will be further described in detail below with reference to the accompanying drawings.

[0035] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention. Example 1:

[0036] A noise reduction component, as described above Figures 1 to 4 This is used in a ratchet and pawl clutch assembly. The ratchet and pawl clutch assembly includes a clutch inner ring 2, multiple pawls 3 arranged circumferentially on the clutch inner ring 2, an elastic retaining ring, and a ratchet 4. The clutch inner ring 2 has a retaining groove 21 that mates with the elastic retaining ring. In this embodiment, the noise reduction component includes an arc-shaped limiting piece 11 arranged between the clutch inner ring 2 and the ratchet 4. The number of arc-shaped limiting pieces 11 corresponds to the number of pawls 3, and the arc-shaped limiting pieces 11 and pawls 3 are one-to-one. In this embodiment, the clutch inner ring 2 is provided with... The three pawls 3 are each provided with a corresponding arc-shaped limiting piece 11, which are evenly distributed circumferentially. Of course, in other optional embodiments, the number of pawls 3 and arc-shaped limiting pieces 11 can be adjusted, which is not limited here. In this embodiment, the arc-shaped limiting pieces 11 are arranged in the limited radial space between the clutch inner ring 2 and the ratchet 4, which can facilitate the arrangement and help reduce or even eliminate the impact on the size of the ratchet clutch assembly, thereby facilitating modification and reducing production costs.

[0037] Reference Figures 1 to 4 A circumferential limiting structure is provided between the muffler and the inner clutch ring 2. The circumferential limiting structure allows the arc-shaped limiting plate 11 to have a first position and a second position relative to the inner clutch ring 2. In the first position, the pawl 3 can be raised to engage with the ratchet 4. In the second position, the arc-shaped limiting plate 11 presses down on the pawl 3, causing the pawl 3 to separate from the ratchet 4. An elastic protrusion 12 is provided on the arc-shaped limiting plate 11, which protrudes radially from the arc-shaped limiting plate 11. The ratchet 4 can contact the elastic protrusion 12 and drive the arc-shaped limiting plate 11 to rotate circumferentially relative to the inner clutch ring 2 between the first position and the second position.

[0038] Reference Figures 1 to 4When the ratchet-pawl clutch assembly is in overrunning mode, the ratchet 4 rotates faster than the inner clutch ring 2, and the ratchet 4 rotates counterclockwise relative to the inner clutch ring 2. After the ratchet 4 contacts the elastic convex plate 12, it drives the elastic convex plate 12 and the arc-shaped limiting plate 11 to rotate circumferentially together. When the arc-shaped limiting plate 11 rotates counterclockwise relative to the inner clutch ring 2, it gradually presses down on the pawl 3 until the pawl 3 separates from the ratchet 4 and rotates to the second position relative to the inner clutch ring 2. When the arc-shaped limiting plate 11 rotates to the second position relative to the inner clutch ring 2, the relative position of the arc-shaped limiting plate 11 and the inner clutch ring 2 remains unchanged. At this time, the state in which the arc-shaped limiting plate 11 presses down on the pawl 3 also remains unchanged. Therefore, in overrunning mode, the ratchet 4 and the pawl 3 are always separated, thereby avoiding the ticking noise caused by the ratchet 4 and the pawl 3 contacting each other in overrunning mode and optimizing the riding experience.

[0039] Reference Figures 1 to 4 When the ratchet and pawl clutch assembly switches from the overrunning state to the engaging drive state, the rotational speed of the ratchet 4 gradually decreases, and the ratchet 4 rotates in the clockwise direction relative to the inner clutch ring 2. After the ratchet 4 contacts the elastic convex plate 12, it drives the elastic convex plate 12 and the arc-shaped limiting plate 11 to rotate together in the circumferential direction. During the process of the arc-shaped limiting plate 11 rotating in the clockwise direction relative to the inner clutch ring 2, the pawl 3 is gradually released until the pawl 3 re-engages with the ratchet 4 and rotates to the first position relative to the inner clutch ring 2. When the arc-shaped limiting plate 11 rotates to the first position relative to the inner clutch ring 2, the relative position of the arc-shaped limiting plate 11 and the inner clutch ring 2 remains unchanged, the pawl 3 and the ratchet 4 remain engaged, and the relative positions of the inner clutch ring 2, the pawl 3, the ratchet 4 and the arc-shaped limiting plate 11 all remain unchanged.

[0040] Reference Figures 1 to 4The inner wall of the ratchet 4 is provided with multiple circumferentially distributed ratchet teeth 41. In the overrunning state, the ratchet teeth 41 contact the elastic protrusion 12 and press the elastic protrusion 12 down. After the ratchet teeth 41 leave, the elastic protrusion 12 will lift and reset under its own elastic force, and then the next ratchet tooth 41 will continue to press the elastic protrusion 12 down, and so on. That is to say, in the overrunning state, there is intermittent continuous contact between the elastic protrusion 12 and the ratchet 4. Specifically, the elastic protrusion 12 has a radially highest point relative to the arc-shaped limiting piece 11. The radially highest point is separated from the ratchet 4, at which time the radially highest point is located between two adjacent ratchet teeth 41, and the radial... The highest point of the elastic cam plate 12 does not contact the inner wall of the ratchet 4 or the two ratchet teeth 41; that is, when the elastic cam plate 12 is lifted and reset under its own elastic force, it will not collide with the ratchet 4. Therefore, in the overtaking state, although there will be intermittent continuous contact between the elastic cam plate 12 and the ratchet 4, the sound produced is very small and has almost no impact on the rider. Of course, in order to enable the ratchet 4 to pass smoothly through the elastic cam plate 12 in either clockwise or counterclockwise directions, the radial distance between the highest radial point of the elastic cam plate 12 and the arc-shaped limiting piece 11 needs to be relatively small. Of course, the actual distance can be adjusted as needed and is not limited here.

[0041] Reference Figures 1 to 4One end of the elastic protruding plate 12 is connected to the arc-shaped limiting piece 11 along the circumferential direction, and the other end along the circumferential direction is a free end. Specifically, the arc-shaped limiting piece 11 has a clearance hole 111, and the elastic protruding plate 12 is located in the clearance hole 111. One end of the elastic protruding plate 12 along the circumferential direction is connected to the inner wall of the clearance hole 111, and the other end along the circumferential direction is a free end. The structural design of one end connected and the other end free end enables the elastic protruding plate 12 to have the ability to elastically reset. Of course, in other optional embodiments, the elastic protruding plate 12 can also adopt other connection structures to achieve the ability to elastically reset, which is not limited here. Specifically, when the ratchet clutch assembly is in the overrun state, the rotation direction of the ratchet 41 is from the connected end of the elastic protruding plate 12 to the free end. This can avoid arching the free end of the elastic protruding plate 12, which is beneficial to extending the service life of the elastic protruding plate 12. Specifically, the outer wall of the elastic protruding plate 12 has a guide slope 121, and a guide slope 121 is formed. The inclined surface 121 is connected to the guide arc surface 122; the guide inclined surface 121 is connected to the outer wall of the arc-shaped limiting plate 11, and the highest point of the radial direction is located on the guide arc surface 122; when the arc-shaped limiting plate 11 is in the first position, when the ratchet 41 rotates counterclockwise relative to the elastic protrusion 12, it first contacts the guide inclined surface 121, gradually presses down on the elastic protrusion 12, and then separates from the elastic protrusion 12 after passing through the guide arc surface 122; when the arc-shaped limiting plate 11 is in the second position, when the ratchet 41 rotates clockwise relative to the elastic protrusion 12, it first contacts the guide arc surface 122, gradually presses down on the elastic protrusion 12, and then separates from the elastic protrusion 12 after passing through the guide inclined surface 121; that is to say, the setting of the guide inclined surface 121 and the guide arc surface 122 in this embodiment is conducive to the ratchet 4 passing smoothly through the elastic protrusion 12, extending the service life of the elastic protrusion 12, and also conducive to reducing the sound generated when the ratchet 41 contacts the elastic protrusion 12.

[0042] Reference Figures 1 to 4 Preferably, the free end of the elastic protrusion 12 is in contact with the outer wall of the clutch inner ring 2; that is, one end of the elastic protrusion 12 is connected to the arc-shaped limiting piece 11, and the free end of the other end is supported by the clutch inner ring 2, which is beneficial to extending the service life of the elastic protrusion 12; specifically, in this embodiment, an arc-shaped bending portion is formed on the elastic protrusion 12, and a guiding arc surface 122 is formed on the outer wall of the bending portion.

[0043] Reference Figures 1 to 4In this embodiment, the muffler also includes a positioning ring plate 14, and each arc-shaped limiting piece 11 is connected to the positioning ring plate 14. The positioning ring plate 14 connects the three arc-shaped limiting pieces 11 into one unit, enabling the three arc-shaped limiting pieces 11 to rotate synchronously, ensuring the smooth operation of the ratchet and pawl clutch assembly. Specifically, the positioning ring plate 14 is located on the axial side of the clutch inner ring 2 and contacts the end face of the clutch inner ring 2, and a circumferential limiting structure is formed between the positioning ring plate 14 and the end face of the clutch inner ring 2. One axial end of the arc-shaped limiting piece 11 is connected to the outer wall of the positioning ring plate 14. Arranging the positioning ring plate 14 on the axial side of the clutch inner ring 2 and adopting a ring plate structure can occupy less axial space and avoid interference with other parts. Specifically, the circumferential limiting structure includes a circumferential limiting protrusion 15 disposed on the inner end face of the positioning ring plate 14, and a... A limiting groove 22 is placed on the end face of the clutch inner ring 2 and mates with the circumferential limiting protrusion 15; when the arc-shaped limiting piece 11 is in the first position relative to the clutch inner ring 2, the circumferential limiting protrusion 15 contacts the inner wall of one end of the limiting groove 22; when the arc-shaped limiting piece 11 is in the second position relative to the clutch inner ring 2, the circumferential limiting protrusion 15 contacts the inner wall of the other end of the limiting groove 22; the circumferential limiting structure is arranged between the positioning ring plate 14 and the end face of the clutch inner ring 2, which facilitates processing and installation; of course, in other optional embodiments, the circumferential limiting structure can also adopt other methods, which are not limited here; of course, in other optional embodiments, the positioning ring plate 14 can also be omitted, so that each arc-shaped limiting piece 11 is independent, and then the circumferential limiting protrusion and the limiting groove are respectively set between the inner wall of the arc-shaped limiting piece 11 and the outer wall of the clutch inner ring 2, which are not limited here.

[0044] Reference Figures 1 to 4 An axial limiting structure is provided between the muffler and the clutch inner ring 2, so that the axial position of the muffler relative to the clutch inner ring 2 remains unchanged. Specifically, the axial limiting structure includes an axial limiting protrusion 13 disposed on the inner side wall of the arc-shaped limiting piece 11 and cooperating with the slot 21. The axial limiting structure is formed by using the original slot 21 on the clutch inner ring 2 to cooperate with the axial limiting protrusion 13, which is beneficial to simplify the structure and facilitate production. Of course, in other optional embodiments, the axial limiting structure can also adopt other structural forms, or additional parts can be used to axially limit the positioning ring plate 14, which is not limited here.

[0045] Reference Figure 1 Specifically, the muffler in this embodiment is integrally molded, which reduces the number of parts and facilitates assembly. Specifically, the muffler includes an arc-shaped limiting plate 11, an elastic protrusion 12, an axial limiting protrusion 13, a circumferential limiting protrusion 15, and a positioning ring plate 14. Of course, in other optional embodiments, the muffler can also adopt a split fixed connection structure, which is not limited here. Example 2:

[0046] A ratchet and pawl clutch assembly, as shown in the reference. Figures 1 to 4 It includes the silencer component from Example 1. Example 3:

[0047] A speed-changing device, as shown in the reference Figures 1 to 5 It includes the ratchet and pawl clutch assembly in Embodiment 2; the transmission device also includes a central shaft 5 and an output housing 6, the inner clutch ring 2 is rolledly supported on the central shaft 5, and the ratchet 4 is fixedly disposed on the inner side wall of the output housing 6; the transmission device can be mounted on the wheel in the form of a transmission hub, or it can be arranged in the central motor, which is not limited here. Example 4:

[0048] A vehicle that includes the transmission device described in Embodiment 3; the vehicle may be a bicycle, an electric bicycle, an electric motorcycle, or a tricycle, etc.

Claims

1. A noise reduction component for a ratchet and pawl clutch assembly, the ratchet and pawl clutch assembly comprising a clutch inner ring, a pawl, and a ratchet, characterized in that: The noise reduction component includes an arc-shaped limiting piece arranged between the inner ring of the clutch and the ratchet; A circumferential limiting structure is provided between the muffler and the inner clutch ring, so that the arc-shaped limiting piece has a first position and a second position relative to the inner clutch ring; in the first position, the pawl can be raised to engage with the ratchet; in the second position, the arc-shaped limiting piece presses down on the pawl, so that the pawl separates from the ratchet. The arc-shaped limiting piece is provided with an elastic protrusion plate, which protrudes radially from the outer wall of the arc-shaped limiting piece; The ratchet can contact the elastic convex plate and drive the arc-shaped limiting plate to rotate circumferentially relative to the clutch inner ring between the first position and the second position; The noise reduction component also includes a positioning ring plate, and the arc-shaped limiting piece is connected to the positioning ring plate; The circumferential limiting structure includes a circumferential limiting protrusion disposed on the inner end face of the positioning ring plate, and a limiting groove disposed on the end face of the clutch inner ring and cooperating with the circumferential limiting protrusion.

2. The silencing component according to claim 1, characterized in that: The elastic convex plate has a radially highest point relative to the arc-shaped limiting piece; the inner wall of the ratchet is provided with ratchet teeth evenly distributed in the circumferential direction; the radially highest point is separated from the ratchet, at which time the radially highest point is located between two adjacent ratchet teeth, and the radially highest point does not contact the inner wall of the ratchet or the two ratchet teeth.

3. The silencing component according to claim 2, characterized in that: One end of the elastic convex plate is connected to the arc-shaped limiting piece along the circumferential direction, and the other end along the circumferential direction is the free end.

4. The noise reduction component according to claim 3, characterized in that: The free end of the elastic protrusion contacts the outer wall of the clutch inner ring.

5. The noise reduction component according to claim 3, characterized in that: The outer wall of the elastic convex plate is formed with a guide slope and a guide arc surface that connects to the guide slope; the guide slope connects to the outer wall of the arc-shaped limiting piece, and the highest point in the radial direction is located on the guide arc surface.

6. The silencing component according to claim 1, characterized in that: An axial limiting structure is provided between the muffler and the clutch inner ring, so that the axial position of the muffler relative to the clutch inner ring remains unchanged.

7. The noise reduction component according to claim 6, characterized in that: The ratchet and pawl clutch assembly also includes an elastic retaining ring and a retaining groove disposed on the inner ring of the clutch and cooperating with the elastic retaining ring; the axial limiting structure includes an axial limiting protrusion disposed on the inner side wall of the arc-shaped limiting piece and cooperating with the retaining groove.

8. The noise reduction component according to claim 1, characterized in that: The ratchet and pawl clutch assembly includes a plurality of pawls arranged circumferentially, and the muffler includes a plurality of arc-shaped limiting plates that respectively cooperate with the pawls.

9. The noise reduction component according to claim 8, characterized in that: Each of the aforementioned arc-shaped limiting pieces is connected to the positioning ring plate.

10. The noise reduction component according to claim 9, characterized in that: The positioning ring plate is located on the axial side of the clutch inner ring, and the circumferential limiting structure is formed between the positioning ring plate and the end face of the clutch inner ring.

11. A ratchet and pawl clutch assembly, characterized in that: Includes the silencer as described in any one of claims 1-10.

12. A speed-changing device, characterized in that: Includes the ratchet and pawl clutch assembly as described in claim 11.

13. A vehicle, characterized in that: Includes the speed change device as described in claim 12.

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