Combined flywheel

Abstract

A combined flywheel, comprising a step cone pulley (300), wherein the step cone pulley (300) is provided with a large-diameter end (310) and a small-diameter end (320) opposite to the large-diameter end (310), the small-diameter end (320) being provided with a wheel hole (301); a large ring gear unit (200); and a hub (100) integrated with the large ring gear unit (200), wherein the hub (100) and the large ring gear unit (200) are coaxial, and the hub (100) runs through the wheel hole (301), such that the large ring gear unit (200) is arranged opposite the large-diameter end (310); one of the large ring gear unit (200) and the large-diameter end (310) is provided with a riveting portion (210), and the other is provided with a riveting hole (311); the riveting portion (210) is inserted in the riveting hole (311) so as to rivet the large ring gear unit (200) and the step cone pulley (300); and one of the large ring gear unit (200) and the large-diameter end (310) is provided with an anti-torsion protrusion (220), and the other is provided with a limiting holes (312); and the anti-torsion protrusion (220) is inserted in the limiting hole (312). The insertion of the anti-torsion protrusion (220) in the limiting hole (312) can reduce a risk of relative rotation between the large ring gear unit (200) and the step cone pulley (300), thereby increasing the torsion resistance and further improving the reliability of the combined flywheel.

Description

Combined flywheel Technical Field

[0001] The present application relates to the technical field of variable speed flywheels, and in particular to a combined flywheel. Background Art

[0002] With the advancement of society, the requirements for lightweight and high strength in various modes of transportation are becoming increasingly stringent. Currently, bicycles are typically reduced in weight through lightweight materials and structures. However, lightweighting is premised on ensuring sufficient strength and rigidity. This is especially true for sports bicycles, which place even higher demands on the strength and rigidity of their flywheels.

[0003] In the related art, a variable speed flywheel is usually assembled from a large gear ring, a wheel hub and a step pulley, wherein the large gear ring and the step pulley are usually only riveted together with rivets, which has poor torsional resistance and low reliability.

[0004] Application Contents

[0005] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a combined flywheel with better reliability.

[0006] According to some embodiments of the present application, the combined flywheel includes: a step pulley having a large diameter end and a small diameter end opposite to the large diameter end, the small diameter end being provided with a wheel hole; a large ring gear unit; and a hub integral with the large ring gear unit, the hub being coaxially arranged with the large ring gear unit and the hub being inserted into the wheel hole, with the large ring gear unit being opposite to the large diameter end.

[0007] Among them, one of the large gear ring unit and the large diameter end is provided with a riveted portion, and the other is provided with a riveted hole. The riveted portion is passed through the riveted hole and rivets the large gear ring unit to the step wheel; one of the large gear ring unit and the large diameter end is provided with an anti-torsion protrusion, and the other is provided with a limiting hole. The anti-torsion protrusion is passed through the limiting hole.

[0008] The combined flywheel according to the embodiment of the present application has at least the following beneficial effects:

[0009] In the combined flywheel of the present application, the large ring gear unit is coaxially arranged with the wheel hub, and the large ring gear unit and the wheel hub are an integrated structure, that is, the large ring gear unit and the wheel hub are made of the same integral material, which is convenient for manufacturing; the rivet part is passed through the rivet hole and riveted to the step pulley. Under the action of the rivet part, the large ring gear unit and the step pulley can be fixed, and the large ring gear unit and the step pulley can be reliably connected; in addition, the anti-torsion protrusion is passed through the limiting hole, so that the risk of relative rotation between the large ring gear unit and the step pulley can be reduced, the anti-torsion ability can be improved, and the reliability of the combined flywheel can be further improved.

[0010] According to some embodiments of the present application, the large-diameter end is provided with a plurality of rivet holes, and the plurality of rivet holes are arranged at intervals along the circumference of the large-diameter end;

[0011] The large gear ring unit is provided with a plurality of riveted parts, which are arranged at intervals along the circumference of the large gear ring unit, and the plurality of riveted parts are passed through the plurality of riveted holes in a one-to-one correspondence.

[0012] According to some embodiments of the present application, the riveted portion is provided on the large gear ring unit, the large diameter end is provided with the riveted hole, the riveted portion passes through the riveted hole, and the end of the riveted portion away from the large gear ring unit is riveted to the step pulley.

[0013] According to some embodiments of the present application, the large ring gear unit is provided with the riveted portion, the large diameter end is provided with the riveted hole, the end of the riveted portion away from the large ring gear unit is a first diameter-reducing section whose diameter gradually increases along a preset direction, and the first diameter-reducing section is riveted into the riveted hole;

[0014] Wherein, the preset direction is the arrangement direction from the large ring gear unit to the large diameter end.

[0015] According to some embodiments of the present application, the riveted part and the large ring gear unit are an integral structure; or, the large ring gear unit is provided with an assembly hole arranged opposite to the riveted hole, the riveted part and the large ring gear unit are a split structure, and the riveted part is passed through the assembly hole.

[0016] According to some embodiments of the present application, the wheel hub is riveted to the hole wall of the wheel hole.

[0017] According to some embodiments of the present application, one end of the wheel hub away from the large ring gear unit is a second diameter-reducing section whose diameter gradually increases along a preset direction, and the second diameter-reducing section is riveted into the wheel hole;

[0018] Wherein, the preset direction is the arrangement direction from the large ring gear unit to the large diameter end.

[0019] According to some embodiments of the present application, a positioning groove is provided on the outer side wall of one end of the wheel hub away from the large ring gear unit, and the small diameter end is positioned and matched with the positioning groove.

[0020] According to some embodiments of the present application, the side of the large gear ring unit close to the large diameter end has a plurality of anti-torsion protrusions arranged at intervals along the circumference of the large gear ring unit;

[0021] The large diameter end is provided with a plurality of limiting holes spaced apart along the circumference of the large diameter end, and the plurality of anti-torsion protrusions are passed through the plurality of limiting holes in a one-to-one correspondence.

[0022] According to some embodiments of the present application, the riveted portion includes an anti-torsion step and a connecting portion connected to the anti-torsion step;

[0023] The rivet hole includes an anti-torsion section and an assembly section that are interconnected. The anti-torsion step is passed through the anti-torsion section. The connecting portion is passed through the assembly section. One end of the connecting portion away from the anti-torsion step is riveted to form a rivet joint.

[0024] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present application is further described below with reference to the accompanying drawings and embodiments, wherein:

[0026] FIG1 is a partial schematic diagram of the cross-sectional structure of the combined flywheel according to the first embodiment of the present application;

[0027] FIG2 is a schematic diagram of the explosion structure of the combined flywheel according to the first embodiment of the present application;

[0028] FIG3 is a partial schematic diagram of the cross-sectional structure of the combined flywheel according to the second embodiment of the present application;

[0029] FIG4 is a partial schematic diagram of the cross-sectional structure of the combined flywheel according to the third embodiment of the present application;

[0030] FIG5 is a partial schematic diagram of the cross-sectional structure of the combined flywheel according to the fourth embodiment of the present application;

[0031] FIG6 is a partial schematic diagram of the cross-sectional structure of the combined flywheel according to the fifth embodiment of the present application.

[0032] Figure numbers: 100, wheel hub; 110, positioning groove; 200, large ring gear unit; 201, assembly hole; 210, rivet portion; 211, anti-torsion step; 212, connecting column; 213, rivet head; 220, anti-torsion protrusion; 300, step pulley; 301, wheel hole; 302, inner ring gear; 310, large diameter end; 311, rivet hole; 3111, anti-torsion section; 3112, assembly section; 312, limiting hole; 320, small diameter end. DETAILED DESCRIPTION

[0033] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0034] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, "multiple" means two or more.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "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 or electrical connections; direct connections or 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 application based on the specific circumstances.

[0036] Example 1

[0037] As shown in FIG1 , a combined flywheel provided in the first embodiment of the present application includes a hub 100 , a large ring gear unit 200 and a step pulley 300 .

[0038] The large ring gear unit 200 is coaxially arranged with the wheel hub 100 and is an integral structure. That is, the large ring gear unit 200 and the wheel hub 100 are manufactured from the same monolithic material. The large ring gear unit 200 and the wheel hub 100 can be made of aluminum alloy, magnesium alloy, titanium alloy, or other lightweight, high-strength materials.

[0039] It should be noted that the large ring gear unit 200 can be a single-layer structure or a multi-layer structure. For example, in FIG1 , the large ring gear unit 200 is a double-layer structure, which includes two ring gears with different diameters.

[0040] The step pulley 300 has a large diameter end 310 and a small diameter end 320 disposed opposite to the large diameter end 310 .

[0041] Specifically, the step pulley 300 is composed of a plurality of gear rings with successively increasing diameters connected to each other, wherein the end where the gear ring with the largest diameter (the inner gear ring 302 ) is located is the large diameter end 310 , and the end where the gear ring with the smallest diameter is located is the small diameter end 320 .

[0042] Furthermore, the small diameter end 320 of the step pulley 300 is provided with a wheel hole 301, the wheel hub 100 is passed through the wheel hole 301, and the large ring gear unit 200 is arranged opposite to the large diameter end 310 of the step pulley 300, that is, the large ring gear unit 200 is located on the side of the step pulley 300 away from the small diameter end 320.

[0043] 1 and 2 , the large ring gear unit 200 is provided with a riveted portion 210 ; the large diameter end 310 of the step pulley 300 is provided with a riveted hole 311 , and the riveted portion 210 is passed through the riveted hole 311 and riveted to the step pulley 300 .

[0044] It can be understood that, under the action of the riveting portion 210 , the large ring gear unit 200 and the step pulley 300 can be fixed, and a reliable connection between the large ring gear unit 200 and the step pulley 300 can be achieved.

[0045] Furthermore, the large diameter end 310 of the step pulley 300 is provided with a plurality of rivet holes 311, which are spaced apart along the circumference of the large diameter end 310 of the step pulley 300; the large ring gear unit 200 is provided with a plurality of rivet portions 210, which are spaced apart along the circumference of the large ring gear unit 200, and the plurality of rivet portions 210 are correspondingly inserted into the plurality of rivet holes 311. In this way, the reliability of the connection between the large ring gear unit 200 and the step pulley 300 can be further improved.

[0046] 1 and 2 , the large gear ring unit 200 has an anti-torsion protrusion 220 on one side close to the large diameter end 310 of the step pulley 300. The large diameter end 310 of the step pulley 300 is provided with a limiting hole 312, and the anti-torsion protrusion 220 is passed through the limiting hole 312. In this way, the risk of relative rotation between the large gear ring unit 200 and the step pulley 300 can be reduced, and the reliability of the connection between the large gear ring unit 200 and the step pulley 300 can be improved.

[0047] Specifically, the anti-torsion protrusion 220 and the large ring gear unit 200 are an integral structure, and are processed and formed on the large ring gear unit 200. The cross-section of the anti-torsion protrusion 220 is a non-circular structure. The hole wall of the limiting hole 312 is matched with the side wall shape of the anti-torsion protrusion 220. After the anti-torsion protrusion 220 is passed through the limiting hole 312, it can limit the rotation of the step pulley 300 relative to the large ring gear unit 200 around the axis of the step pulley 300.

[0048] Furthermore, the large ring gear unit 200 has a plurality of anti-torsion protrusions 220 spaced apart along the circumference of the large ring gear unit 200 on one side near the large diameter end 310 of the step pulley 300. The large diameter end 310 of the step pulley 300 has a plurality of limiting holes 312 spaced apart along the circumference of the large diameter end 310, and the plurality of anti-torsion protrusions 220 are disposed in a one-to-one correspondence within the plurality of limiting holes 312. This further improves the anti-torsion capability and the reliability of the connection between the large ring gear unit 200 and the step pulley 300.

[0049] In some other embodiments, the limiting hole 312 may be provided on the large ring gear unit 200 , and the anti-torsion protrusion 220 may be provided on the step pulley 300 .

[0050] As shown in FIG. 1 , the rivet portion 210 and the large ring gear unit 200 are an integral structure, that is, the rivet portion 210 is formed on the large ring gear unit 200 .

[0051] Furthermore, the rivet portion 210 passes through the rivet hole 311 , and one end of the rivet portion 210 away from the large ring gear unit 200 is riveted to be riveted to the step pulley 300 .

[0052] Specifically, the riveted part 210 is passed through the riveted hole 311 , and the end of the riveted part 210 away from the large gear ring unit 200 passes through the riveted hole 311 . By riveting the end of the riveted part 210 away from the large gear ring unit 200 , the riveted part 210 and the step pulley 300 can be riveted.

[0053] As shown in Figure 1, further, the end of the hub 100 away from the large ring gear unit 200 is a second diameter-reducing section whose diameter gradually increases along a preset direction, and the second diameter-reducing section is riveted into the wheel hole 301 of the step pulley 300; wherein the preset direction is the arrangement direction from the large ring gear unit 200 to the large diameter end 310 of the step pulley 300.

[0054] It can be understood that the wheel hub 100 has a second variable diameter section at one end away from the large ring gear unit 200, and the diameter of the second variable diameter section gradually increases along a preset direction. In this way, the second variable diameter section can be pressed together with the hole wall of the wheel hole 301, thereby improving the connection reliability between the wheel hub 100 and the step pulley 300.

[0055] The second diameter-reducing section may be formed by flanging or riveting at the end of the wheel hub 100 away from the large ring gear unit 200 .

[0056] Furthermore, a positioning groove 110 is provided on the outer side wall of the wheel hub 100 away from the large ring gear unit 200, and the small diameter end 320 of the step pulley 300 is positioned and matched with the positioning groove 110. In this way, the positioning accuracy between the wheel hub 100 and the step pulley 300 can be further improved.

[0057] Example 2

[0058] As shown in Figure 3, the difference between Example 2 and Example 1 is that the end of the riveted portion 210 away from the large ring gear unit 200 is a first diameter-reducing section whose diameter gradually increases along a preset direction, and the first diameter-reducing section is riveted to the rivet hole 311; wherein the preset direction is the arrangement direction from the large ring gear unit 200 to the large diameter end 310 of the step pulley 300.

[0059] It can be understood that by riveting the end of the rivet portion 210 away from the large ring gear unit 200, the end of the rivet portion 210 away from the large ring gear unit 200 can be thickened, so that the end of the rivet portion 210 away from the large ring gear unit 200 is pressed together with the wall of the rivet hole 311, thereby achieving the fixation of the large ring gear unit 200 and the step pulley 300.

[0060] Example 3

[0061] As shown in FIG4 , the differences between the third embodiment and the first embodiment include:

[0062] (1) The riveted portion 210 and the large ring gear unit 200 are of a separate structure. The large ring gear unit 200 is provided with an assembly hole 201 arranged opposite to the rivet hole 311, and the riveted portion 210 is inserted into the assembly hole 201 and the rivet hole 311. The riveted portion 210 is a rivet, which is sequentially inserted into the assembly hole 201 and the rivet hole 311, thereby achieving riveting of the large ring gear unit 200 and the step pulley 300.

[0063] (2) The hub 100 and the small diameter end 320 of the step pulley 300 can be assembled in place without riveting them together.

[0064] Example 4

[0065] As shown in Figure 5, the difference between Example 4 and Example 3 is that the end of the riveted portion 210 away from the large ring gear unit 200 is a third diameter-reducing section whose diameter gradually increases along a preset direction, and the third diameter-reducing section is riveted to the rivet hole 311; wherein the preset direction is the arrangement direction from the large ring gear unit 200 to the large diameter end 310 of the step pulley 300.

[0066] It can be understood that by riveting the end of the rivet portion 210 away from the large ring gear unit 200, the end of the rivet portion 210 away from the large ring gear unit 200 can be thickened, so that the end of the rivet portion 210 away from the large ring gear unit 200 is pressed together with the wall of the rivet hole 311, thereby achieving the fixation of the large ring gear unit 200 and the step pulley 300.

[0067] Example 5

[0068] As shown in Figure 6, the difference between Example 5 and Example 4 is that the riveted portion 210 and the large ring gear unit 200 are an integral structure, the riveted portion 210 includes an anti-torsion step 211 connected to the large ring gear unit 200, and a connecting portion 212 connected to the anti-torsion step 211, and the connecting portion 212 is located on the side of the anti-torsion step 211 away from the large ring gear unit 200; the rivet hole 311 includes an anti-torsion section 3111 and an assembly section 3112 that are interconnected, and the assembly section 3112 is located on the side of the anti-torsion section 3111 away from the large ring gear unit 200, the anti-torsion step 211 is penetrated into the anti-torsion section 3111, and the connecting portion 212 is penetrated into the assembly section 3112, and one end of the connecting portion 212 away from the anti-torsion step 211 is riveted to form a rivet head 213 riveted to the step pulley 300.

[0069] Specifically, the anti-torsion step 211 cooperates with the anti-torsion section 3111 to mainly improve the anti-torsion capability between the large ring gear unit 200 and the step pulley 300; the rivet head 213 can prevent the large ring gear unit 200 and the step pulley 300 from being disengaged, and at the same time, can also provide anti-torsion capability.

[0070] It should be noted that, in some other embodiments, the riveted portion 210 and the step pulley 300 may also be an integral structure, and the corresponding riveted holes 311 are provided on the large ring gear unit 200 .

[0071] In the combined flywheel of the present application, the large ring gear unit 200 is coaxially arranged with the wheel hub 100, and the large ring gear unit 200 and the wheel hub 100 are an integral structure, that is, the large ring gear unit 200 and the wheel hub 100 are made of the same integral material, which is convenient for manufacturing; the rivet portion 210 is passed through the rivet hole 311, and under the action of the rivet portion 210, the large ring gear unit 200 and the step pulley 300 can be fixed, and the large ring gear unit 200 and the step pulley 300 can be reliably connected; in addition, the anti-torsion protrusion 220 is passed through the limiting hole 312, so that the risk of relative rotation between the large ring gear unit 200 and the step pulley 300 can be reduced, the anti-torsion ability can be improved, and the reliability of the combined flywheel can be further improved.

[0072] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," 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 application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0073] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A combined flywheel, comprising: A stepped pulley having a large-diameter end and a small-diameter end disposed opposite to the large-diameter end, and a wheel hole is provided at the small-diameter end; A large gear ring unit; A hub integrated with the large gear ring unit, the hub is coaxially arranged with the large gear ring unit, and the hub is inserted into the wheel hole and the large gear ring unit is disposed opposite to the large-diameter end. Wherein, one of the large gear ring unit and the large-diameter end is provided with a riveting portion, and the other is provided with a riveting hole. The riveting portion is inserted into the riveting hole to rivet the large gear ring unit and the stepped pulley; one of the large gear ring unit and the large-diameter end is provided with an anti-torsion protrusion, and the other is provided with a limiting hole, and the anti-torsion protrusion is inserted into the limiting hole.

2. The combined flywheel according to claim 1, wherein, A plurality of the riveting holes are provided at the large-diameter end, and the plurality of riveting holes are arranged at intervals along the circumferential direction of the large-diameter end; A plurality of the riveting portions are provided on the large gear ring unit, the plurality of riveting portions are arranged at intervals along the circumferential direction of the large gear ring unit, and the plurality of riveting portions are respectively inserted into the plurality of riveting holes.

3. The combined flywheel according to claim 1, wherein, The large gear ring unit is provided with the riveting portion, the large-diameter end is provided with the riveting hole, the riveting portion protrudes from the riveting hole, and one end of the riveting portion away from the large gear ring unit is riveted to be riveted to the stepped pulley.

4. The combined flywheel according to claim 1, wherein, The large gear ring unit is provided with the riveting portion, the large-diameter end is provided with the riveting hole, one end of the riveting portion away from the large gear ring unit is a first diameter-changing section with a diameter gradually increasing in a preset direction, and the first diameter-changing section is riveted in the riveting hole; Wherein, the preset direction is the arrangement direction from the large gear ring unit to the large-diameter end.

5. The combined flywheel according to claim 1, wherein, The riveting portion and the large gear ring unit are of an integral structure; or, the large gear ring unit is provided with an assembly hole opposite to the riveting hole, the riveting portion and the large gear ring unit are of a split structure, and the riveting portion is inserted into the assembly hole.

6. The combined flywheel according to claim 1, wherein, The hub is riveted to the hole wall of the wheel hole.

7. The combined flywheel according to claim 6, wherein, One end of the hub away from the large gear ring unit is a second diameter-changing section with a diameter gradually increasing in a preset direction, and the second diameter-changing section is riveted in the wheel hole; Wherein, the preset direction is the arrangement direction from the large gear ring unit to the large-diameter end.

8. The combined flywheel according to claim 1, wherein, A positioning groove is provided on the outer side wall of one end of the hub away from the large gear ring unit, and the small-diameter end is in positioning fit with the positioning groove.

9. The combined flywheel according to claim 1, wherein, On one side of the large gear ring unit close to the large-diameter end, a plurality of the anti-torsion protrusions are arranged at intervals along the circumferential direction of the large gear ring unit; A plurality of the limiting holes are provided at the large-diameter end and are arranged at intervals along the circumferential direction of the large-diameter end, and the plurality of anti-torsion protrusions are respectively inserted into the plurality of limiting holes.

10. The combined flywheel according to claim 1, wherein, The riveting portion includes an anti-torsion step and a connecting portion connected to the anti-torsion step; The riveting hole includes an anti-torsion section and an assembly section that communicate with each other. The anti-torsion step is inserted into the anti-torsion section, the connecting portion is inserted into the assembly section, and one end of the connecting portion away from the anti-torsion step is riveted to form a riveting head.

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