Ratchet tooth assembly and hub

Abstract

The utility model provides a ratchet tooth assembly and a hub, and relates to the technical field of bicycle accessories. The ratchet wheel tooth assembly comprises a bottom tooth part connected with the hub body and an upper tooth part connected with the ratchet wheel body, the upper tooth part is provided with a first tooth section, the bottom tooth part is provided with a second tooth section, at least one of the bottom tooth part and the upper tooth part is provided with a noise reduction groove, the first tooth section is meshed with the second tooth section, and the first tooth section is meshed with the second tooth section. At least part of teeth of the second tooth section extend into the noise reduction grooves, and / or at least part of teeth of the first tooth section extend into the noise reduction grooves, and / or the noise reduction grooves located in the upper tooth part and the bottom tooth part are arranged in a one-to-one correspondence mode; original first tooth sections and second tooth sections are reserved on the upper tooth part and the bottom tooth part, meshing and power transmission of the upper tooth part and the bottom tooth part are guaranteed, the noise reduction grooves are formed in the upper tooth part and / or the bottom tooth part, the roughness between the upper tooth part and the bottom tooth part can be reduced, damping is reduced, and noise generated during power transmission of the ratchet tooth assembly is lowered.

Description

Technical Field

[0001] The utility model relates to the technical field of bicycle accessories, in particular to a ratchet gear assembly and a hub. Background Art

[0002] The hub is a common transmission component on bicycles. Chinese patent application number 2018205855832 discloses a multi-tooth dual-clutch hub, which includes a hub body and a ratchet body. The hub body has lower teeth 6, and the ratchet body is provided with upper teeth 7. The upper teeth 7 mesh with the lower teeth to achieve power transmission.

[0003] The applicant has discovered that the existing technology has at least the following technical problems: in the existing technology, when the upper teeth and the lower teeth (or bottom teeth) are engaged, there is a large damping between the two, and a large noise is generated when the force is transmitted, which causes a large noise at the hub position when the bicycle is running, affecting the rider's experience. Utility Model Content

[0004] The purpose of the present invention is to provide a ratchet tooth assembly and a hub to solve the technical problems in the prior art of large damping between the upper teeth and bottom teeth of the hub and large noise during power transmission; the various technical effects that can be produced by the preferred technical solution among the many technical solutions provided by the present invention are detailed below.

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

[0006] The ratchet tooth assembly provided by the utility model comprises a bottom tooth portion connected to the hub body and an upper tooth portion connected to the ratchet body, wherein:

[0007] The upper tooth portion is provided with a first tooth segment, and the bottom tooth portion is provided with a second tooth segment. At least one of the bottom tooth portion and the upper tooth portion is provided with a sound-reducing groove. The first tooth segment is meshed with the second tooth segment, and at least part of the teeth of the second tooth segment extends into the sound-reducing groove, and / or at least part of the teeth of the first tooth segment extends into the sound-reducing groove, and / or the sound-reducing grooves on the upper tooth portion and the bottom tooth portion are arranged in a one-to-one correspondence.

[0008] Preferably, the number of the sound-reducing grooves on the bottom tooth portion or the upper tooth portion is more than two, and the sound-reducing grooves and the first tooth segments are alternately arranged around the axis of the upper tooth portion, or the sound-reducing grooves and the second tooth segments are alternately arranged around the axis of the bottom tooth portion.

[0009] Preferably, the sound reduction groove is a fan-shaped groove, and the center of the fan-shaped groove is located on the central axis of the upper tooth portion or the bottom tooth portion.

[0010] Preferably, the tooth bottom of the first tooth segment is connected to the groove bottom of the sound-reducing groove, or the tooth bottom of the second tooth segment is connected to the groove bottom of the sound-reducing groove.

[0011] Preferably, one of the bottom tooth portion and the upper tooth portion is provided with an insertion portion, and the other is provided with a recessed portion. When the insertion portion extends into the recessed portion and is plugged into place with the recessed portion, the first tooth segment can engage with the second tooth segment, and the sound reduction groove is located on the recessed portion and / or the insertion portion.

[0012] Preferably, the recessed portion is arranged at one end of the upper tooth portion facing the hub body, and the recessed portion is a conical groove body, and the inner diameter surface of the conical groove body gradually increases in the direction approaching the hub body; the first tooth segment is located on the inner surface of the conical groove body.

[0013] Preferably, the insertion portion is arranged at one end of the bottom tooth portion facing the ratchet body, and the insertion portion is a conical protrusion, and the radial cross-section of the conical protrusion gradually decreases in the direction approaching the ratchet body; the second tooth segment is located on the outer surface of the conical protrusion.

[0014] Preferably, the sound reducing grooves are located on the inner surface of the conical groove body and are arranged alternately with the first tooth segments along the central axis of the conical groove body;

[0015] And / or, the sound reduction grooves are located on the outer surface of the conical protrusion and are arranged alternately with the second tooth segments along the central axis of the conical protrusion.

[0016] Preferably, the first tooth segment and the second tooth segment are both oblique teeth or planar teeth.

[0017] The utility model also provides a hub, comprising a hub body, a ratchet body and the ratchet tooth assembly.

[0018] Compared with the prior art, the ratchet tooth assembly and hub provided by the present invention have the following beneficial effects: the original first tooth segment and second tooth segment are retained on the upper tooth portion and the bottom tooth portion to ensure the meshing and power transmission of the upper tooth portion and the bottom tooth portion, and noise reduction grooves are opened on the upper tooth portion and / or the bottom tooth portion to reduce the roughness between the upper tooth portion and the bottom tooth portion, thereby reducing the damping, thereby reducing the noise generated during the power transmission of the ratchet tooth assembly, and improving the quieting effect of the hub. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 It is a structural diagram of the upper tooth part;

[0021] Figure 2 It is a schematic diagram of the cross-sectional structure of the upper tooth part;

[0022] Figure 3 It is a structural schematic diagram of one embodiment of the bottom tooth portion;

[0023] Figure 4 It is an axial side view of the ratchet hub;

[0024] Figure 5 yes Figure 4 Partial schematic diagram at point A in the middle.

[0025] In the figure, 1 is the hub body; 2 is the ratchet body; 3 is the bottom tooth portion; 31 is the insert portion; 32 is the second tooth segment; 4 is the upper tooth portion; 41 is the recessed portion; 42 is the first tooth segment; 43 is the spline; 44 is the limiting inner ring; 5 is the elastic portion; 6 is the sound reduction groove. DETAILED DESCRIPTION

[0026] To make the purpose, technical solution, and advantages of the present invention more clear, the technical solution of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be understood that the terms "center," "length," "width," "height," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," and "side" and the like, indicating positions or location relationships, are based on the positions or location relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0028] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0029] The embodiment of the utility model provides a ratchet tooth assembly and a hub, which can reduce the noise generated during power transmission of the ratchet tooth assembly and improve the quiet effect of the hub.

[0030] The following combination Figure 1-Figure 5 The technical solution provided by the utility model is described in more detail.

[0031] Embodiment 1:

[0032] like Figure 1-Figure 5 As shown, the ratchet tooth assembly provided by the present invention includes a bottom tooth portion 3 connected to the hub body 1 and an upper tooth portion 4 connected to the ratchet body 2, wherein: the upper tooth portion 4 is provided with a first tooth segment 42, and the bottom tooth portion 3 is provided with a second tooth segment 32, and at least one of the bottom tooth portion 3 and the upper tooth portion 4 is provided with a sound reduction groove 6, the first tooth segment 42 is meshed with the second tooth segment 32, at least part of the teeth of the second tooth segment 32 extends into the sound reduction groove 6, and / or, at least part of the teeth of the first tooth segment 42 extends into the sound reduction groove 6, and / or, the sound reduction grooves 6 on the upper tooth portion 4 and the bottom tooth portion 3 are provided in a one-to-one correspondence.

[0033] See also Figure 1 and Figure 2 As shown, in this embodiment, the sound reduction groove 6 is located on the upper tooth portion 4, and the number of the sound reduction groove 6 can be one or more than two. When the number of the sound reduction groove 6 is more than two, see Figure 1 As shown, the sound reducing grooves 6 and the first tooth segments 42 are alternately arranged around the axis of the upper tooth part 4 .

[0034] Alternatively, the sound reducing groove 6 is located on the bottom tooth portion 3 , and the number of the sound reducing groove 6 can be one or more than two. When the number of the sound reducing groove 6 is more than two, the sound reducing groove 6 and the second tooth segment 32 are alternately arranged around the axis of the bottom tooth portion 3 .

[0035] Alternatively, the sound reducing groove 6 is located on the bottom tooth portion 3 and the upper tooth portion 4 , but does not affect the meshing of the first tooth segment 42 and the second tooth segment 32 .

[0036] The ratchet tooth assembly of this embodiment retains the original first tooth segment 42 and second tooth segment 32 on the upper tooth portion 4 and the bottom tooth portion 3 to ensure the meshing and power transmission of the upper tooth portion 4 and the bottom tooth portion 3. A noise reduction groove 6 is opened on the upper tooth portion 4 and / or the bottom tooth portion 3 to reduce the roughness between the upper tooth portion 4 and the bottom tooth portion 3, thereby reducing the damping, and further reducing the noise generated during the power transmission of the ratchet tooth assembly, thereby improving the quieting effect of the hub.

[0037] As an alternative embodiment, see Figure 1 As shown, the sound reduction groove 6 is a fan-shaped annular groove, and the center of the fan-shaped annular groove is located on the central axis of the upper tooth portion 4 or the bottom tooth portion 3.

[0038] In this embodiment, the center of the fan-shaped annular groove is located on the central axis of the upper tooth portion 4. Of course, when the sound reduction groove 6 is located on the bottom tooth portion 3, the center of the fan-shaped annular groove is located on the central axis of the bottom tooth portion 3. The above structure improves the stability of the structure.

[0039] As an alternative embodiment, see Figure 1 and Figure 2 As shown, the tooth bottom of the first tooth segment 42 is connected to the groove bottom of the sound-reducing groove 6 .

[0040] In the above structure, when the first tooth segment 42 and the second tooth segment 32 are engaged with each other, at least a portion of the second tooth segment 32 can extend into the sound reduction groove 6, which does not affect the power transmission between the bottom tooth portion 3 and the upper tooth portion 4, and can reduce damping and reduce noise.

[0041] Alternatively, when the sound-reducing groove 6 is located on the bottom tooth portion 3 , the tooth bottom of the second tooth segment 32 is connected to the groove bottom of the sound-reducing groove 6 .

[0042] As an alternative embodiment, see Figure 1 and Figure 3 As shown, one of the bottom tooth portion 3 and the upper tooth portion 4 is provided with an insert portion 31, while the other is provided with a recessed portion 41. When the insert portion 31 extends into and plugs into the recessed portion 41, the first tooth segment 42 engages with the second tooth segment 32. The sound-reducing groove 6 is located in the recessed portion 41 and / or the insert portion 31. The recessed portion 41 is provided at the end of the upper tooth portion 4 facing the hub body 1. The recessed portion 41 is a tapered groove, the inner diameter of which gradually increases as it approaches the hub body 1. The first tooth segment 42 is located on the inner surface of the tapered groove. Both the first tooth segment 42 and the second tooth segment 32 are oblique teeth.

[0043] The second tooth segment 32 is arranged on the insertion portion 31, and the first tooth segment 42 is arranged on the recessed portion 41. When the insertion portion 31 extends into the recessed portion 41, compared with the flat tooth structure, it is convenient for the bottom tooth portion 3 and the upper tooth portion 4 to be quickly positioned, so that the first tooth segment 42 and the second tooth segment 32 are quickly engaged. The matching structure of the insertion portion 31 and the recessed portion 41 can improve the stability of the structure, prevent the bottom tooth portion 3 and the upper tooth portion 4 from being disengaged due to strong jumping, etc., and facilitate the stable transmission of torque.

[0044] This embodiment is also applicable to a plane tooth meshing structure, thereby reducing noise and damping.

[0045] As an alternative embodiment, see Figure 3 As shown, the insertion portion 31 is arranged at the end of the bottom tooth portion 3 facing the ratchet body 2. The insertion portion 31 is a conical protrusion, and the radial cross-section of the conical protrusion gradually decreases in the direction approaching the ratchet body 2; the second tooth segment 32 is located on the outer surface of the conical protrusion.

[0046] As an alternative embodiment, see Figure 1 As shown, the sound reduction grooves 6 are located on the inner surface of the conical groove body and are alternately arranged with the first tooth segments 42 along the central axis of the conical groove body; this structure facilitates ensuring the balance of the upper tooth portion 4 and enables the upper tooth portion 4 to be a more stable structure.

[0047] And / or, not shown in the figure, the sound reduction grooves 6 are located on the outer surface of the conical protrusion and are arranged alternately with the second tooth segments 32 along the central axis of the conical protrusion. This structure facilitates ensuring the balance of the bottom tooth portion 3 and can make the bottom tooth portion 3 a more stable structure.

[0048] Example 2:

[0049] This embodiment provides a hub, see Figure 4 and Figure 5 As shown, the hub includes a hub body, a ratchet body and the above-mentioned ratchet tooth assembly.

[0050] See also Figure 4 and Figure 5 As shown, the hub also includes an elastic portion 5, and the bottom tooth portion 3 is threadedly connected to the hub body 1, see Figure 1 The bottom tooth portion 3 is provided with an external thread for connecting to the hub body 1, the upper tooth portion 4 is connected to the ratchet body 2 through a spline 43, the upper tooth portion 4 is provided with a limiting inner ring 44, the elastic portion 5 is located in the ratchet body 2, and the elastic portion 5 is abutted against the side of the limiting inner ring 44 facing away from the bottom tooth portion 3, thereby pushing the upper tooth portion 4 to a position engaged with the bottom tooth portion 3.

[0051] See also Figure 1As shown, the limiting inner ring 44 is located at the inner ring position of the upper tooth portion 4 and extends along the radial direction of the upper tooth portion 4 toward the central axis of the upper tooth portion 4. The elastic portion 5 can be a compression spring, which pushes the upper tooth portion 4 against the bottom tooth portion 3 by pressing against the limiting inner ring 44, ensuring that the bottom tooth portion 3 and the upper tooth portion 4 are engaged.

[0052] In the description of this specification, specific features, structures or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0053] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do 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. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0054] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A ratchet tooth assembly, characterized in that: It includes a bottom tooth portion connected to the hub body and an upper tooth portion connected to the ratchet body, wherein: The upper tooth portion is provided with a first tooth segment, and the bottom tooth portion is provided with a second tooth segment. At least one of the bottom tooth portion and the upper tooth portion is provided with a sound-reducing groove. The first tooth segment is meshed with the second tooth segment, and at least part of the teeth of the second tooth segment extends into the sound-reducing groove. At least part of the teeth of the first tooth segment extends into the sound-reducing groove. The sound-reducing grooves on the upper tooth portion and the bottom tooth portion are provided in a one-to-one correspondence. The number of the sound reducing grooves on the bottom tooth portion or the upper tooth portion is more than two, and the sound reducing grooves and the first tooth segments are alternately arranged around the axis of the upper tooth portion, or the sound reducing grooves and the second tooth segments are alternately arranged around the axis of the bottom tooth portion.

2. The ratchet tooth assembly according to claim 1, wherein: The sound reduction groove is a fan-shaped annular groove, and the center of the fan-shaped annular groove is located on the central axis of the upper tooth portion or the bottom tooth portion.

3. The ratchet tooth assembly according to claim 1, wherein: The tooth bottom of the first tooth segment is connected to the groove bottom of the sound reducing groove, or the tooth bottom of the second tooth segment is connected to the groove bottom of the sound reducing groove.

4. The ratchet tooth assembly according to claim 1, wherein: One of the bottom tooth portion and the upper tooth portion is provided with an insertion portion, and the other is provided with a recessed portion. When the insertion portion extends into the recessed portion and is plugged into place with the recessed portion, the first tooth segment can engage with the second tooth segment, and the sound reduction groove is located on the recessed portion and / or the insertion portion.

5. The ratchet tooth assembly according to claim 4, wherein: The recessed portion is arranged at one end of the upper tooth portion facing the hub body. The recessed portion is a conical groove body, and the inner diameter surface of the conical groove body gradually increases in the direction approaching the hub body; the first tooth segment is located on the inner surface of the conical groove body.

6. The ratchet tooth assembly according to claim 5, wherein: The insertion portion is arranged at one end of the bottom tooth portion facing the ratchet body. The insertion portion is a conical protrusion, and the radial cross-section of the conical protrusion gradually decreases in the direction approaching the ratchet body; the second tooth segment is located on the outer surface of the conical protrusion.

7. The ratchet tooth assembly according to claim 6, wherein: The sound reducing grooves are located on the inner surface of the conical groove body and are arranged alternately with the first tooth segments along the central axis of the conical groove body; And / or, the sound reduction grooves are located on the outer surface of the conical protrusion and are arranged alternately with the second tooth segments along the central axis of the conical protrusion.

8. The ratchet tooth assembly according to claim 1, wherein: The first tooth segment and the second tooth segment are both oblique teeth or planar teeth.

9. A hub, characterized in that: The invention comprises a hub body, a ratchet body and a ratchet tooth assembly according to any one of claims 1 to 8.

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