Bicycle transmission device

Abstract

The invention provides a bicycle transmission device. The bicycle transmission device comprises a flywheel component, a second tooth piece and a locking ring. The flywheel component includes a plurality of teeth. One of the tooth pieces is a first tooth piece, the first tooth piece comprises a first tooth piece part, a first protruding part and a spline groove part, and the spline groove part is a groove in the inner surface of the first protruding part. The spline groove part penetrates through the first tooth piece part in the axial direction. The first protruding part protrudes out of one side of the first tooth piece part. The second tooth piece comprises a second tooth piece part, a second protruding part, a spline protruding part and a through hole part. The second protruding part protrudes out of one side of the second tooth piece part, the spline protruding part is a plurality of protruding blocks on the outer surface of the second protruding part, the through hole part is a through hole in the inner surface of the second protruding part, and the spline protruding part is arranged in the spline groove part so that the second tooth piece can be assembled to the first tooth piece. And the locking ring is arranged in the through hole part.

Description

Technical Field

[0001] The invention relates to a bicycle transmission device. Background Art

[0002] Bicycles are usually provided with a hub transmission, which is mounted on the rear wheel of the bicycle and allows the rider of the bicycle to select different gear ratios to change the pedaling force. Traditionally, the hub transmission includes a hub axle mounted on the bicycle frame. The hub axle rotatably supports a driving member for transmitting the pedaling force to the hub transmission via a sprocket and a chain.

[0003] In the conventional technology, U.S. Invention Patent Publication No. US10889353 discloses a bicycle rear sprocket assembly including a plurality of sprockets and a sprocket frame configured to support at least one of the plurality of sprockets. The sprocket frame includes a plurality of spline teeth and a circumferentially extending non-spline portion, wherein the middle of the spline teeth of the first tooth member has a through hole, but the through hole in the middle of the spline further extends a flange to form a non-penetrating structure. In addition, Taiwan Invention Patent Publication No. TW590955B discloses a bicycle sprocket assembly, including a sprocket portion having a plurality of radially extending teeth, and the spline of the first tooth member is also a non-penetrating structure. These non-penetrating structures are difficult to manufacture, and in practice require large tonnage extrusion forging to produce the non-penetrating structure, which places high demands on the material of the parts, the strength of the mold, and the machine capacity, and further the cost will also increase.

[0004] Therefore, how to improve and provide a bicycle transmission device to avoid the above-mentioned problems is a problem to be solved in the industry. Summary of the invention

[0005] The purpose of the present invention is to provide a bicycle transmission device and a new type of assembly structure, which can reduce manufacturing complexity and production cost.

[0006] The present invention provides a bicycle transmission device, characterized by comprising:

[0007] A flywheel component includes a plurality of tooth members, one of which is a first tooth member, the first tooth member includes a first tooth plate portion, a first protruding portion, a spline groove portion, and a notch portion, the spline groove portion is a groove on the inner surface of the first protruding portion, the spline groove portion penetrates the first tooth plate portion in an axial direction, the first protruding portion protrudes from one side of the first tooth plate portion, the notch portion is a groove recessed from one side of the first tooth plate portion, and the notch portion is adjacent to the spline groove portion;

[0008] a second toothed member, comprising a second toothed plate portion, a second protruding portion, a spline protruding portion, a through hole portion, and a bearing portion, wherein the second protruding portion protrudes from one side of the second toothed plate portion, the spline protruding portion is a plurality of protrusions on the outer surface of the second protruding portion, the bearing portion is a flange extending from the outer side of the spline protruding portion, the bearing portion abuts against the notch portion, the through hole portion is a through hole on the inner surface of the second protruding portion, and the spline protruding portion is disposed within the spline groove portion, so as to assemble the second toothed member to the first toothed member; and

[0009] A locking ring is arranged in the through hole.

[0010] The bicycle transmission device, wherein: the number of teeth of the second tooth plate portion is smaller than the number of teeth of the first tooth plate portion.

[0011] The bicycle transmission device, wherein: the first tooth part is a tooth plate with the smallest diameter and the least number of teeth among the multiple teeth of the flywheel component.

[0012] The present invention also provides a bicycle transmission device, characterized in that it comprises:

[0013] A flywheel component includes a plurality of tooth members, one of which is a first tooth member, the first tooth member includes a first tooth plate portion, a first protruding portion, and a spline groove portion, the spline groove portion is a groove on the inner surface of the first protruding portion, the spline groove portion penetrates the first tooth plate portion in an axial direction, and the first protruding portion protrudes from one side of the first tooth plate portion;

[0014] a second toothed member, comprising a second toothed plate portion, a second protruding portion, a spline protruding portion, a through hole portion, and a bearing portion, wherein the second protruding portion protrudes from one side of the second toothed plate portion, the spline protruding portion is a plurality of protrusions on the outer surface of the second protruding portion, the bearing portion is a flange extending from the outer side of the spline protruding portion, the through hole portion is a through hole on the inner surface of the second protruding portion, and the spline protruding portion is disposed within the spline groove portion, so as to assemble the second toothed member to the first toothed member; and

[0015] A locking ring is arranged in the through hole.

[0016] The bicycle transmission device, wherein: the number of teeth of the second tooth piece portion is less than the number of teeth of the first tooth piece portion, and the first tooth piece portion is a tooth piece with the smallest diameter and the least number of teeth among the multiple teeth of the flywheel component.

[0017] The bicycle transmission device, wherein: the number of teeth of the second gear plate portion is less than or equal to 10.

[0018] The bicycle transmission device, wherein: the number of teeth of the first tooth plate portion is greater than or equal to 11.

[0019] The bicycle transmission device, wherein: the plurality of teeth are connected together in sequence.

[0020] The bicycle transmission device, wherein the flywheel component has a set of connecting notches.

[0021] The bicycle transmission device further comprises:

[0022] A ratchet seat comprises a ratchet seat spline protrusion, the ratchet seat spline protrusion is located in the assembly slot, and one end of the ratchet seat spline protrusion protrudes from the assembly slot.

[0023] The bicycle transmission device, wherein the remaining teeth of the plurality of teeth are connected together in sequence on the ratchet seat.

[0024] The bicycle transmission device, wherein: the spline protrusion of the ratchet seat is engaged with the spline groove of the first toothed member.

[0025] The bicycle transmission device, wherein: the ratchet seat includes a seat body and a hollow portion, the ratchet seat spline protrusion protrudes from the seat body, the hollow portion is a through hole on the inner surface of the ratchet seat spline protrusion, the hollow portion is provided with an internal thread, the internal thread and an external thread of the locking ring are screwed together to lock the locking ring to the ratchet seat.

[0026] Based on the above, the present invention arranges the spline protrusion of the second toothed member in the spline groove of the first toothed member to assemble the second toothed member to the first toothed member. Then, the locking ring is arranged in the through hole of the second toothed member to assemble a bicycle transmission device. Compared with the conventional technology, the present invention provides a new type of assembly structure, in which the spline groove of the first toothed member is a through-type structure, which reduces the manufacturing complexity, does not require large-tonnage extrusion forging, and does not require high requirements on part materials, mold strength and machine capacity to produce this type of spline groove, thereby further reducing the manufacturing cost.

[0027] In order to make the present invention more clearly understood, embodiments are listed below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the combination of the bicycle transmission device of the present invention.

[0029] Figure 2 It is a partial exploded schematic diagram of the bicycle transmission device of the present invention.

[0030] Figure 3 It is an exploded schematic diagram of the bicycle transmission device of the present invention.

[0031] Figure 4Schematic diagram of the second tooth member of the present invention.

[0032] Figure 5 It is a cross-sectional schematic diagram of the first toothed member combined with the second toothed member of the present invention.

[0033] Figure 6 It is a cross-sectional exploded schematic diagram of some components of the bicycle transmission device of the present invention.

[0034] Figure 7 for Figure 6 A cross-sectional assembly diagram of some components.

[0035] Figure 8 FIG. 2 is an exploded schematic diagram of another embodiment of the first tooth member and the second tooth member of the present invention.

[0036] Fig. 9 It is a cross-sectional assembly diagram of another embodiment of the first tooth member and the second tooth member of the present invention.

[0037] Description of reference numerals: 100 - bicycle transmission device; 110 - flywheel component; 112, 212 - first tooth member; 112A, 212A - first tooth plate portion; 112B, 212B - first protrusion; 112C, 212C - spline groove portion; 112D - through hole; 112E: notch portion; 114, 114A, 114B, 114C, 114D, 114E, 114F, 114G, 114H, 114I, 114J - tooth member; 116 - assembly notch; 12 0, 220 - second tooth member; 122, 222 - second tooth plate portion; 122A, 222A - through hole portion; 124, 224 - second protrusion; 126, 226 - spline protrusion; 128 - bearing portion; 130 - locking ring; 132 - engaging portion; 134 - ring body; 136 - external thread; 138 - hole portion; 140 - ratchet seat; 142 - seat body; 144 - ratchet seat spline protrusion; 146 - hollow portion; 148 - internal thread; 150 - rear wheel hub; AX - axial direction. DETAILED DESCRIPTION

[0038] The following examples are listed and described in detail with the accompanying drawings, but the examples provided are not intended to limit the scope of the present invention. In addition, the drawings are for illustration purposes only and are not drawn to their original size. For ease of understanding, the same elements will be described with the same symbols in the following description.

[0039] The terms “including”, “comprising”, “having”, etc. mentioned in the present invention are all open terms, that is, meaning “including but not limited to”.

[0040] In the description of each embodiment, when the terms “first,” “second,” “third,” “fourth,” etc. are used to describe an element, it is only used to distinguish these elements from each other and does not limit the order or importance of these elements.

[0041] In the description of each embodiment, the so-called "coupling" or "connection" may refer to two or more elements making direct physical or electrical contact with each other, or making indirect physical or electrical contact with each other, and "coupling" or "connection" may also refer to two or more elements operating or moving with each other.

[0042] Figure 1 It is a schematic diagram of the combination of the bicycle transmission device of the present invention. Figure 2 It is a partial exploded schematic diagram of the bicycle transmission device of the present invention. Figure 3 It is an exploded schematic diagram of the bicycle transmission device of the present invention. Figure 4 Schematic diagram of the second tooth member of the present invention. Figure 5 It is a cross-sectional schematic diagram of the first toothed member combined with the second toothed member of the present invention. Figure 6 It is a cross-sectional exploded schematic diagram of some components of the bicycle transmission device of the present invention. Figure 7 for Figure 6 A cross-sectional assembly diagram of some components, wherein Figure 2 The ratchet seat 140 is installed on the flywheel component 110. Figure 6 The first tooth member 112, the second tooth member 120, the locking ring 130 and the ratchet seat 140 are shown. Figures 1 to 7 The bicycle transmission device 100 of the present invention includes a flywheel component 110, a second toothed member 120, and a locking ring 130. The flywheel component 110 includes a first toothed member 112, and a plurality of toothed members 114, such as toothed members 114A, 114B, 114C, 114D, 114E, 114F, 114G, 114H, 114I, 114J, etc. The first toothed member 112 is one of the toothed members of the flywheel component 110. In one embodiment, the first toothed member 112 is connected to the toothed members 114 in sequence. In other embodiments, the toothed members 114 may be connected to each other in sequence on the ratchet seat 140 in advance.

[0043] The first toothed member 112 includes a first toothed portion 112A, a first protruding portion 112B and a spline groove portion 112C, and a through hole 112D is formed in the first toothed portion 112A. The first protruding portion 112B protrudes from one side of the first toothed portion 112A. The spline groove portion 112C is a groove on the inner surface of the first protruding portion 112B, and the spline groove portion 112C penetrates the first toothed portion 112A in an axial direction AX, that is, the spline groove portion 112C is completely penetrated in the first toothed portion 112A, so that the spline groove portion 112C of the first toothed member 112 is a penetrating structure.

[0044] by Figure 1 For example, the first tooth member 112 includes a first tooth plate portion 112A, and the first tooth plate portion 112A is a tooth plate with the smallest diameter and the least number of teeth among the teeth of the flywheel component 110. However, the present invention is not limited thereto, and one of the teeth 114A, 114B, 114C, 114D, 114E, 114F, 114G, 114H, 114I, 114J in the flywheel component 110 can be replaced by the first tooth member 112, that is, the first tooth member 112 can be a tooth member with other numbers of teeth of the flywheel component 110. For example, the first tooth-piece portion 112A is a tooth-piece with the smallest diameter and the least number of teeth among the tooth-pieces of the flywheel component 110. The number of teeth of the first tooth-piece portion 112A is equal to 11, and the number of teeth of the remaining tooth members 114A, 114B, 114C, 114D, 114E, 114F, 114G, 114H, 114I, and 114J is greater than the number of teeth of the first tooth-piece portion 112A. In other embodiments, the number of teeth of the first tooth-piece portion 112A is greater than 11.

[0045] The second toothed member 120 includes a second toothed portion 122, a second protruding portion 124, a spline protruding portion 126, and a through hole portion 122A, wherein the second protruding portion 124 protrudes from one side of the second toothed portion 122, the spline protruding portion 126 is a plurality of protrusions on the outer surface of the second protruding portion 124, and the through hole portion 122A is a through hole on the inner surface of the second protruding portion 124. The number of teeth of the second toothed portion 122 is less than the number of teeth of the first toothed portion 112A. For example, the number of teeth of the second toothed portion 122 is equal to 10, and the number of teeth of the first toothed portion 112A is equal to 11. In other embodiments, the number of teeth of the second toothed portion 122 is less than 10.

[0046] The present invention arranges the spline protrusion 126 of the second toothed member 120 in the spline groove 112C of the first toothed member 112 to assemble the second toothed member 120 to the first toothed member 112. Then, the locking ring 130 is arranged in the through hole 122A of the second toothed member 120 to assemble the bicycle transmission device 100. Compared with the conventional technology, the present invention provides a new type of assembly structure, wherein the spline groove 112C of the first toothed member 112 is a through-type structure, which reduces the manufacturing complexity, does not require large-tonnage extrusion forging, and does not require high requirements on part materials, mold strength and machine capacity to produce the spline groove 112C of this type, thereby further reducing the manufacturing cost.

[0047] In a further embodiment, Figure 3As shown, the flywheel component 110 has a group connection slot 116. The bicycle transmission device 100 further includes a ratchet seat 140 and a rear wheel hub 150, wherein the rear wheel hub 150 is connected to the ratchet seat 140, and the ratchet seat 140 includes a seat body 142, a ratchet seat spline protrusion 144, and a hollow portion 146, wherein the ratchet seat spline protrusion 144 is connected to one side of the seat body 142, the ratchet seat spline protrusion 144 protrudes above the seat body 142, and the hollow portion 146 is a through hole on the inner surface of the ratchet seat spline protrusion 144, and the inner surface of the hollow portion 146 adjacent to the end edge is provided with an internal thread 148. When assembled, the ratchet seat spline protrusion 144 is located in the group connection slot 116, and one end of the ratchet seat spline protrusion 144 protrudes from the group connection slot 116.

[0048] In a further embodiment, please cooperate with Figure 2 , Figure 3 , Figure 6 and Figure 7 The locking ring 130 includes a joint portion 132, a ring body 134, an external thread 136, and a hole portion 138, wherein the hole portion 138 is formed inside the joint portion 132, the joint portion 132 is, for example, a circular hollow body, the ring body 134 is connected to one side of the joint portion 132, and the aperture of the ring body 134 is larger than the aperture of the joint portion 132, and the external thread 136 is provided on a partial outer surface of the joint portion 132. In this way, the first protrusion 112B in the first tooth member 112 is arranged on the outer side of the spline protrusion 144 of the ratchet seat, and the spline protrusion 126 of the second tooth member 120 is arranged in the spline groove portion 112C of the first tooth member 112, so that the second tooth member 120 is combined with the first tooth member 112, and then, the engaging portion 132 in the locking ring 130 is respectively penetrated through the through hole portion 122A in the second tooth member 120 and the hollow portion 146 in the ratchet seat 140, the ring body 134 will bear on the second tooth plate portion 122, and the external thread 136 on the outer surface of the engaging portion 132 and the internal thread 148 in the hollow portion 146 in the ratchet seat 140 are screwed together to lock the locking ring 130 to the ratchet seat 140.

[0049] In a further embodiment, Figure 2 , Figure 3 , Figures 5 to 7 As shown, the first toothed member 112 includes a notch portion 112E, which is a groove recessed from the surface of one side of the first toothed portion 112A, and the notch portion 112E is adjacent to the spline groove portion 112C. The second toothed member 120 includes a bearing portion 128, which is a flange extending from the outer side of the spline protrusion 126. When the second toothed member 120 is combined with the first toothed member 112, the bearing portion 128 abuts against the notch portion 112E.

[0050] However, the present invention is not limited thereto. Figure 8 and Fig. 9 As shown in FIG. 1 , it is another embodiment of the first toothed member 212 and the second toothed member 220. The first toothed member 212 includes a first toothed portion 212A, a first protruding portion 212B, and a spline groove portion 212C. The first protruding portion 212B protrudes from one side of the first toothed portion 212A. The spline groove portion 212C is a groove on the inner surface of the first protruding portion 212B. The spline groove portion 212C passes through the first toothed portion 212A. The first toothed member 212 is similar to the aforementioned Figures 1 to 7 Compared with the first tooth member 112, the difference is that the first tooth member 112 has a notch portion 112E, while the surface of the first tooth piece portion 212A in the first tooth member 212 has no groove, so that the spline groove portion 212C runs from the surface of the first tooth piece portion 212A to the bottom surface of the first protrusion 212B.

[0051] On the other hand, the second toothed member 220 includes a second toothed portion 222, a second protruding portion 224, a spline protruding portion 226, and a through hole portion 222A, wherein the second protruding portion 224 protrudes from one side of the second toothed portion 222, the spline protruding portion 226 is a plurality of protrusions on the outer surface of the second protruding portion 224, and the through hole portion 222A is a through hole on the inner surface of the second protruding portion 224. Figures 1 to 7 Compared with the second toothed member 120 of the present invention, the difference is that the second toothed member 120 has a bearing portion 128, while the surface of the spline protrusion 226 in the second toothed member 220 does not have a flange extending outward. In this way, the spline protrusion 226 is disposed in the spline groove 212C of the first toothed member 212, so that the second toothed member 220 is assembled to the first toothed member 212.

[0052] In summary, the present invention arranges the spline protrusion of the second toothed member in the spline groove of the first toothed member to assemble the second toothed member to the first toothed member. Then, the locking ring is arranged in the through hole of the second toothed member to assemble a bicycle transmission device. Compared with the conventional technology, the present invention provides a new type of assembly structure, in which the spline groove of the first toothed member is a through-type structure, which reduces the manufacturing complexity, does not require large-tonnage extrusion forging, and does not require high requirements on part materials, mold strength and machine capacity to produce the spline groove of this type, thereby further reducing the manufacturing cost.

[0053] Although the present invention has been disclosed by the embodiments as above, it is not intended to limit the present invention. Any ordinary technician with common knowledge in the relevant technical field should be able to make some changes and modifications without departing from the spirit and scope of the present invention, all of which belong to the protection scope of the present invention.

Claims

1. A bicycle transmission device, characterized in that: include: A flywheel component includes a plurality of tooth members, one of which is a first tooth member, the first tooth member includes a first tooth plate portion, a first protruding portion, a spline groove portion, and a notch portion, the spline groove portion is a groove on the inner surface of the first protruding portion, the spline groove portion penetrates the first tooth plate portion in an axial direction, the first protruding portion protrudes from one side of the first tooth plate portion, the notch portion is a groove recessed from one side of the first tooth plate portion, and the notch portion is adjacent to the spline groove portion; A second toothed member, comprising a second toothed plate portion, a second protruding portion, a spline protruding portion, a through hole portion, and a bearing portion, wherein the second protruding portion protrudes from one side of the second toothed plate portion, the spline protruding portion is a plurality of protrusions on the outer surface of the second protruding portion, the bearing portion is a flange extending from the outer side of the spline protruding portion, the bearing portion abuts against the notch portion, the through hole portion is a through hole on the inner surface of the second protruding portion, and the spline protruding portion is disposed within the spline groove portion, so as to assemble the second toothed member to the first toothed member; as well as A locking ring is arranged in the through hole.

2. The bicycle transmission device according to claim 1, characterized in that: The number of teeth of the second tooth plate portion is smaller than the number of teeth of the first tooth plate portion.

3. The bicycle transmission device according to claim 1, characterized in that: The first tooth piece portion is a tooth piece with the smallest diameter and the least number of teeth among the plurality of tooth elements of the flywheel component.

4. A bicycle transmission device, characterized in that: include: A flywheel component includes a plurality of tooth members, one of which is a first tooth member, the first tooth member includes a first tooth plate portion, a first protruding portion, and a spline groove portion, the spline groove portion is a groove on the inner surface of the first protruding portion, the spline groove portion penetrates the first tooth plate portion in an axial direction, and the first protruding portion protrudes from one side of the first tooth plate portion; A second toothed member, comprising a second toothed plate portion, a second protruding portion, a spline protruding portion, a through hole portion, and a bearing portion, wherein the second protruding portion protrudes from one side of the second toothed plate portion, the spline protruding portion is a plurality of protrusions on the outer surface of the second protruding portion, the bearing portion is a flange extending from the outer side of the spline protruding portion, the through hole portion is a through hole on the inner surface of the second protruding portion, and the spline protruding portion is disposed within the spline groove portion, so as to assemble the second toothed member to the first toothed member; as well as A locking ring is arranged in the through hole.

5. The bicycle transmission device according to claim 4, characterized in that: The number of teeth of the second tooth-piece portion is less than the number of teeth of the first tooth-piece portion. The first tooth-piece portion is a tooth piece with the smallest diameter and the least number of teeth among the plurality of tooth members of the flywheel component.

6. The bicycle transmission device according to claim 1 or 4, characterized in that: The number of teeth of the second tooth plate portion is less than or equal to ten.

7. The bicycle transmission device according to claim 1 or 4, characterized in that: The number of teeth of the first tooth plate portion is greater than or equal to 11.

8. The bicycle transmission device according to claim 1 or 4, characterized in that: The plurality of teeth are connected together in sequence.

9. The bicycle transmission device according to claim 1 or 4, characterized in that: The flywheel component has a set of connecting grooves.

10. The bicycle transmission device according to claim 9, characterized in that: Also includes: A ratchet seat comprises a ratchet seat spline protrusion, the ratchet seat spline protrusion is located in the assembly slot, and one end of the ratchet seat spline protrusion protrudes from the assembly slot.

11. The bicycle transmission device according to claim 10, characterized in that: The remaining tooth members of the plurality of tooth members are connected together in sequence on the ratchet seat.

12. The bicycle transmission device according to claim 10, characterized in that: The spline protrusion of the ratchet seat is engaged with the spline groove of the first toothed member.

13. The bicycle transmission device according to claim 10, wherein: The ratchet seat includes a seat body and a hollow portion, the ratchet seat spline protrusion protrudes from the seat body, the hollow portion is a through hole on the inner surface of the ratchet seat spline protrusion, the hollow portion is provided with an internal thread, and the internal thread is screwed with an external thread of the locking ring to lock the locking ring to the ratchet seat.

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