A tension wheel for a rear fork chain guide

Abstract

This utility model discloses a tension wheel for a rear fork chain guide, relating to the field of bicycle component technology. It includes a gear, a first plate, and a second plate. The gear has multiple teeth protruding from its periphery, and a bearing is mounted in its center. Each of the first and second plates extends a ring portion; when these two ring portions are joined, a gear groove is formed between the first and second plates. The bearing is located between the gear groove and the gear. The teeth of the gear are lower than the outer edge of the second plate, together forming a tension wheel. When this tension wheel is installed in a rear fork chain guide, the chain guide is pivotally connected to the tension wheel by a cage-like frame. A chain maintains engagement with the gear through the cage-like frame. The outer edge of the second plate is higher than the outer edge of the chain to prevent the chain passing through the cage-like frame from falling off.

Description

Technical Field

[0001] This utility model relates to the field of bicycle parts technology, and in particular to a tension wheel for a rear fork chain guide. Background Technology

[0002] A device that allows the chain to be easily returned to the rear derailleur tension wheel by pedaling when it falls off the tension wheel is described in European Utility Model Patent No. 1568591. This rear derailleur is equipped with a base component, a linkage mechanism, a movable component, an outer plate, an inner plate, a guide wheel, a tension wheel, and a chain return section. The base component is mounted on the frame. The linkage mechanism is mounted at one end to the base component. The movable component is mounted at the other end of the linkage mechanism and moves relative to the base component. The outer plate is mounted to the movable component and oscillates like a seesaw. The inner plate is mounted facing the outer plate. The guide wheel is a portion mounted rotatably on one side of both plates and engages the chain by axial movement. The tension wheel is a portion mounted rotatably on the other side of both plates and engages the chain. The chain return section is mounted on the inner plate near the tension wheel, where the gap from the chain is narrower than at other locations.

[0003] However, the factors that cause a chain to fall off are very complex. For example, riding a bicycle on rough roads and experiencing violent up-and-down vibrations can affect the chain tension. Or, during shifting, the increase in kinetic energy from pedaling occurs at the moment the chain engages the gears, which can also interfere with the chain tension and cause the chain to fall off. Utility Model Content

[0004] The purpose of this invention is to address the deficiencies in the existing technology by proposing a tension wheel for a rear fork chain guide.

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

[0006] A tension wheel for a rear fork chain guide includes a gear, a first plate and a second plate, wherein the first plate and the second plate are disposed on opposite sides of the gear and cooperate with a bearing inside the gear;

[0007] The inner circumferential surface of the first piece is provided with a first protrusion, and the first protrusion is provided with a first hole;

[0008] The inner circumferential surface of the second piece is provided with a second protrusion, and the second protrusion is provided with a second hole;

[0009] The first hole and the second hole are provided in correspondence, and the resulting through hole is used to connect with the shaft on the chain hoist.

[0010] Furthermore, the gear has multiple continuous teeth raised on its outer periphery, and the inner ring forms a bearing hole located at the geometric center of the gear; a flange is provided on one side of the bearing hole, and the flange is used to limit the bearing position.

[0011] Furthermore, the first piece has a ring structure, with a ring portion on the side adjacent to the gear, which is adapted to the inner ring of the bearing.

[0012] Furthermore, the second piece has a ring portion on one side adjacent to the gear, which is adapted to fit the inner ring of the bearing.

[0013] Furthermore, a reinforcing part is provided on one side of the second piece, which is used to strengthen the structural strength of the second piece; a notch is formed between the second piece and the reinforcing part; a supporting part is provided between the reinforcing part and the ring part, the supporting part is a ring structure, and the supporting part at the notch is exposed outward.

[0014] Furthermore, the first hole and the second hole correspond to the geometric center point of the ring, and the teeth of the gear are higher than the outer edge of the first piece and lower than the outer edge of the second piece.

[0015] Beneficial effects

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: when the tension wheel is installed on a rear fork chain guide, the rear fork chain guide is pivotally connected to the tension wheel by a cage frame, a chain maintains a meshing relationship with the gear through the cage frame, and the outer edge of the second plate is higher than the outer edge of the chain to prevent the chain passing through the cage frame from falling off. Attached Figure Description

[0017] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0018] Figure 1 An exploded perspective view of a preferred embodiment of the tension wheel.

[0019] Figure 2 This is a diagram showing the assembly structure of the tension wheel combination.

[0020] Figure 3 This is a schematic diagram of a tension wheel implemented in a typical rear fork chain guide.

[0021] Figure 4 for Figure 3 A partial front view of the rear fork chain guide.

[0022] Figure 5 for Figure 4 Rear view of the rear fork chain guide.

[0023] In the diagram: Gear-10; Tooth-11; Bearing hole-12; Gear groove-13; Flange-14; Bearing-15; First plate-20; First ring-21; First protrusion-22; First hole-23; Second plate-30; Reinforcing part-31; Notch-32; Second ring-33; Second protrusion-34; Second hole-35; Support part-36; Bicycle-40; Frame-41; Gear set-42; Rear fork chain guide-43; Large gear-44; Chain-45; Shaft-46; Arc length-47; Cage frame-50; Inner plate-51; Outer plate-52. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0027] Furthermore, the terminology used in this application should be interpreted broadly, and those skilled in the art can understand its specific meaning based on the actual circumstances. For example, the term "installation" used in this application can be defined as a detachable fixed installation or a non-detachable fixed installation; the terms "set up" and "equipped with" can be defined as a contact-type installation or a non-contact-type installation; the terms "connect" and "link" can be defined as a fixed connection or a movable connection; the term "matching" can be defined as identical or similar in shape or size; and the directional terms used are based on the accompanying drawings or directions defined according to actual circumstances and common general knowledge.

[0028] Figure 1In a preferred embodiment of the tension wheel of the present invention, it is shown to include: a gear 10, a first plate 20 and a second plate 30.

[0029] According to standard specifications, the gear 10 has a diameter and a plurality of continuous teeth 11 raised around its periphery. A bearing bore 12 is formed at the geometric center of the gear 10, and one end of the bearing bore 12 is a flange 14 provided on the gear 10. The flange 14 is a foolproof mechanism that restricts a bearing 15 (see...) Figure 2 It is installed in the direction of the bearing bore 12.

[0030] The first plate 20 has a first ring portion 21, which extends on one side of the first plate 20 toward the gear 10, making the first plate 20 an annular plate. The first plate 20 also has a first protrusion 22 and a first hole 23. The first protrusion 22 protrudes from the circumferential surface inside the first ring portion 21. The first hole 23 passes through the first protrusion 22 and connects the two sides of the first plate 20.

[0031] A reinforcing portion 31 protrudes from one side of the second sheet 30 to enhance its structural strength. A support portion 36 protrudes from the middle of the reinforcing portion 31, forming a notch 32 from the edge of the second sheet 30 to the support portion 36, exposing a portion of the support portion 36. Thus, the support portion 36 remains intact, allowing for another second ring portion 33 of the same construction. In other words, the second ring portion 33 extends from one side of the support portion 36 toward the gear 10, making the second sheet 30 a hollow sheet. A second protrusion 34 protrudes from the inner circumferential surface of the second ring portion 33, allowing another second hole 35 to pass through the second protrusion 34 and connect the two sides of the second sheet 30.

[0032] like Figure 2 As shown, when the two ring portions 21 and 33 are joined together, the first plate 20 and the second plate 30 form a gear groove 13. The inner circumferential surface of the bearing 15 contacts the two ring portions 21 and 33, allowing the gear 10 to be installed in the gear groove 13. The outer circumferential surface of the bearing 15 contacts the gear 10, allowing the gear 10 to rotate relative to the first plate 20 and the second plate 30.

[0033] Furthermore, the tension wheel can be completed by aligning a shaft 46 with the two holes 23 and 35 and mounting it on a cage-like frame of a rear fork chain guide 43 (see...). Figure 3The two holes 23 and 35 are offset from the geometric center of the two rings 21 and 33, causing the distance D1 from one tooth 11 of the gear 10 to the central axis of the two holes 23 and 35 to be greater than the distance D2 from the central axis to the tooth 11 on the other side of the gear 10. Moreover, the tooth 11 of the gear 10 is higher than the outer edge of the first piece 20 and lower than the outer edge of the second piece 30.

[0034] like Figure 3 As shown, the rear fork chain guide 43 is positioned at the rear end of a frame 41, adjacent to the rear wheel of a bicycle 40. A gear set 42 is installed between the rear wheel and the frame 41, and the gear set 42 engages with a chain 45 connected end-to-end to a large gear 44 located on the frame 41. The chain 45 passes around the tension pulley and guide pulley of the rear fork chain guide 43. The tension pulley changes the tension of the chain 45, and the guide pulley guides the chain 45 to engage with one of the gears in the gear set 42, changing the speed at which the large gear 44 drives the bicycle 40 forward.

[0035] like Figure 4 As shown, the shaft 46 is fixed to an outer plate 52 of the cage frame 50. The shaft 46 is located at an eccentric position on the first piece 20, causing the gear 10 to rotate eccentrically around the shaft 46. This results in the gear 10 being closer to the shaft 46 via the teeth 11 of the cage frame 50, and further away from the shaft 46 via the teeth 11 exposed on the cage frame 50. Consequently, the arc length 47 of the chain 45 passing through the cage frame 50 and around the tension wheel is shorter than that of commonly used rear fork chain guides. In this embodiment, the rear fork chain guide 43 compensates for the tension of the chain 45, improving the problem of chain slippage.

[0036] like Figure 5 As shown, an inner plate 51 and the outer plate 2 are combined to form the cage frame 50. The notch 32 of the second piece 30 fits into the inner plate 51, so the tension wheel can rotate freely in the rear fork chain guide 43. The outer edge of the second piece 30 is higher than the outer periphery of the chain 45, which blocks the chain 45 passing through the cage frame 50 and prevents the chain 45 from falling off.

[0037] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A tension wheel for a rear fork chain guide, characterized in that, It includes a gear, a first plate and a second plate, the first plate and the second plate are disposed on opposite sides of the gear and cooperate with the bearing inside the gear; The inner circumferential surface of the first piece is provided with a first protrusion, and the first protrusion is provided with a first hole; The inner circumferential surface of the second piece is provided with a second protrusion, and the second protrusion is provided with a second hole; The first hole and the second hole are provided in correspondence, and the resulting through hole is used to connect with the shaft on the chain hoist.

2. A tensioner wheel for a chain stay according to claim 1, wherein, The gear has multiple continuous teeth raised on its outer periphery, and an inner ring forming a bearing hole located at the geometric center of the gear; a flange is provided on one side of the bearing hole, and the flange is used to limit the bearing position.

3. A tensioner wheel for a chain stay according to claim 1, wherein, The first piece has a ring structure, with a ring portion on the side adjacent to the gear, which is adapted to the inner ring of the bearing.

4. A tensioner wheel for a chain stay according to claim 1, wherein, The second piece has a ring on one side adjacent to the gear, and the ring is adapted to fit the inner ring of the bearing.

5. A tensioner wheel for a chain stay according to claim 4, wherein, A reinforcing part is provided on one side of the second piece, which is used to strengthen the structural strength of the second piece; a notch is formed between the second piece and the reinforcing part; a supporting part is provided between the reinforcing part and the ring part, which is a ring structure, and the supporting part at the notch is exposed outward.

6. A tensioner wheel for a chain stay according to claim 1, wherein, The first hole and the second hole correspond to the geometric center point of the ring. The teeth of the gear are higher than the outer edge of the first piece and lower than the outer edge of the second piece.

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