A single stage flywheel

Abstract

The utility model provides a single -stage flywheel. Single -stage flywheel includes inner core and sets up the outer cover of inner core, is provided with one -way clutch mechanism between inner core and outer cover to make outer cover can occur relative rotation with inner core in single rotation direction. One -way clutch mechanism includes a plurality of jack and with a plurality of elastic pieces corresponding setting up a plurality of jack. The circumferential wall of inner core is equipped with several accommodating grooves, and the jack and elastic piece are installed in the accommodating groove along the axial direction of the inner core, and the circumferential wall of the inner core is provided with a step part, and the accommodating groove is at least partially opened in the step part. Single -stage flywheel includes the bearing setting between inner core and outer cover, and the bearing has the inner ring fixed connection with inner core, the outer ring fixed connection with outer cover and the several ball bearings between the inner ring and the outer ring, wherein the inner ring is crimped on the step part to limit the jack and the elastic piece along the axial direction of the inner core from the accommodating groove. The single -stage flywheel provided by the utility model can improve the convenience and use reliability of flywheel maintenance.

Description

Technical Field

[0001] This utility model relates to the field of bicycle technology, and in particular to a single-stage flywheel. Background Technology

[0002] The freewheel is a crucial component on a bicycle used for power transmission. It typically consists of an outer ring and an inner ring. The outer ring engages with the chain, while the inner ring is fixed to the wheel. A pawl mechanism connects the outer ring and the inner ring. When the user pedals, the chain drives the outer ring to rotate forward. At this time, the pawl mechanism locks the connection between the outer ring and the inner ring, thus enabling the inner ring and the wheel to rotate. When the user stops pedaling or pedals in the opposite direction, the outer ring remains stationary or rotates in the opposite direction. At this time, the pawl mechanism retracts, disengaging the inner ring from the outer ring and thus not affecting the wheel's movement. Additionally, to ensure smooth relative rotation between the outer ring and the inner ring, multiple ball bearings are usually installed between them.

[0003] In existing technologies, pawl structures typically include multiple pawl blocks arranged circumferentially within an inner core, and simultaneously held in place by a circular elastic clamp. This existing solution suffers from the problem that, because multiple pawl blocks share a single elastic clamp, damage to one pawl block can disrupt the normal operation of the others. Furthermore, this pawl structure is inconvenient to assemble and disassemble. When one pawl block needs repair, all ball bearings must be removed and reassembled, and other pawl blocks may also loosen or fall out, requiring further reassembly and increasing maintenance costs and time. Additionally, the large number of components required for assembling multiple ball bearings and pawl blocks increases the likelihood of assembly errors, leading to uneven gaps between the inner core and outer casing. This can result in foreign objects such as mud and sand entering the casing, as well as abnormalities such as jamming and unusual noises, severely impacting the reliability of the flywheel.

[0004] Therefore, it is necessary to propose a new technical solution to overcome the above-mentioned shortcomings. Utility Model Content

[0005] This invention provides a single-stage flywheel to solve the problems of poor flywheel maintenance convenience and reliability.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a single-stage flywheel, comprising an inner core and an outer sleeve fitted onto the inner core, wherein a one-way clutch mechanism is provided between the inner core and the outer sleeve, so that the outer sleeve can rotate relative to the inner core in a single rotational direction, wherein...

[0007] The one-way clutch mechanism includes multiple jacks and multiple elastic elements corresponding to the multiple jacks;

[0008] The inner core has several receiving grooves on its peripheral wall. The jack and elastic element are installed in the receiving grooves along the axial direction of the inner core. The inner core has a stepped portion on its peripheral wall, and the receiving grooves are at least partially opened in the stepped portion.

[0009] The single-stage flywheel includes a bearing disposed between the inner core and the outer sleeve. The bearing has an inner ring fixedly connected to the inner core, an outer ring fixedly connected to the outer sleeve, and a plurality of balls disposed between the inner ring and the outer ring. The inner ring is pressed against the stepped portion to restrict the jack and the elastic element from disengaging from the receiving groove along the axial direction of the inner core.

[0010] Optionally, the elastic element is a metal spring sheet, which includes an assembly portion for mounting on the inner core and a deformable portion for elastically abutting the jack. The deformable portion includes an arc segment, and the jack contacts the arc segment along its tangential direction.

[0011] Optionally, the receiving groove includes an assembly groove for accommodating the assembly part and an abutment groove for the deformable part to abut against when pressed. A support protrusion is provided between the assembly groove and the abutment groove, and the support protrusion remains abutting against the connection between the assembly part and the deformable part.

[0012] Optionally, the elastic element is in the shape of a "3", and the abutment groove is arc-shaped.

[0013] Optionally, the jack includes a pivot portion for pivotally connecting to the inner core and a pawl portion for engaging with the outer casing. The pawl portion elastically abuts against the deformable portion. The receiving groove includes a pivot groove for accommodating the pivot portion. Both the mounting groove and the pivot groove are superior arc grooves to restrict the elastic element and the jack from disengaging radially along the superior arc groove.

[0014] Optionally, the single-stage flywheel includes a washer disposed on the stepped portion, and the inner ring of the bearing is supported on the stepped portion by the washer.

[0015] Optionally, the single-stage flywheel includes an inner retaining ring sleeved on the outside of the inner core, the inner retaining ring being threadedly connected to and fixed to the inner core and pressing against the inner ring of the bearing.

[0016] Optionally, the single-stage flywheel includes an outer retaining ring disposed on the inner side of the outer casing, the outer retaining ring being threadedly connected to and fixed to the outer casing and pressing against the outer ring of the bearing; wherein, there is a gap between the inner retaining ring and the outer retaining ring.

[0017] Optionally, the inner side of the outer sleeve is formed with a first stepped ring and a second stepped ring higher than the first stepped ring. The first stepped ring has a toothed groove that cooperates with the jack to achieve one-way locking. The outer ring of the bearing is pressed against the second stepped ring.

[0018] Optionally, a shielding plate is provided at the end face of the bearing to shield the gap between the inner and outer rings of the bearing.

[0019] The single-stage flywheel provided by this utility model includes multiple jacks and multiple elastic elements corresponding to the jacks. Since the elastic elements are independently set and correspond one-to-one with the jacks, when one jack is damaged or malfunctions, it does not affect the normal operation of the other jacks, thus enhancing reliability during use. Furthermore, the jacks and elastic elements are installed in receiving grooves opened on the inner core along the axial direction of the inner core. A stepped portion is provided on the peripheral wall of the inner core, and the jacks and elastic elements extend to the stepped portion. The inner ring of the bearing is pressed onto the stepped portion to prevent the jacks and elastic elements from disengaging from the receiving groove along the axial direction of the inner core, thereby improving the convenience and reliability of disassembly and assembly of the jacks and elastic elements. In addition, this utility model uses bearings instead of multiple ball bearings in the prior art, avoiding the problem of reassembling multiple ball bearings one by one during disassembly and maintenance, greatly reducing the difficulty of disassembly and assembly. Moreover, as a precision independent component, the bearing can effectively ensure the assembly accuracy of the flywheel, reduce the risk of foreign object entry, rotation jamming, abnormal noise, etc., and improve the reliability of the flywheel. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below only relate to some embodiments of this utility model, and are not intended to limit this utility model.

[0021] Figure 1 This is a three-dimensional assembly diagram of an embodiment of the single-stage flywheel of this utility model.

[0022] Figure 2 This is a three-dimensional composite view of another embodiment of the single-stage flywheel of this utility model.

[0023] Figure 3 This is an exploded perspective view of an embodiment of the single-stage flywheel of this utility model.

[0024] Figure 4 yes Figure 3 A magnified view of a portion of point A in the middle.

[0025] Figure 5 This is a cross-sectional view of an embodiment of the single-stage flywheel of this utility model.

[0026] Figure 6 This is a perspective view of the inner core and one-way clutch mechanism in one embodiment of the single-stage flywheel of this utility model.

[0027] Explanation of reference numerals in the attached drawings: 100, single-stage flywheel; 1, outer casing; 11, chain tooth; 12, internal thread; 13, tooth groove; 131, first stepped ring; 132, second stepped ring; 2, inner core; 21, external thread; 22, receiving groove; 221, assembly groove; 222, abutment groove; 223, pivot groove; 224, support protrusion; 23, stepped part; 24, flange part; 3, jack; 31, pivot part; 32, pawl part; 4, elastic element; 41, assembly part; 42, deformable part; 43, connecting part; 5, bearing; 51, outer ring; 52, inner ring; 53, ball; 54, baffle plate; 6, inner retaining ring; 7, outer retaining ring; 8, washer. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings. The components of the embodiments of this utility model described and shown in the accompanying drawings can be arranged and designed in various different configurations. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0029] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0030] Unless otherwise defined, the technical or scientific terms used in this patent document shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model patent specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "an," "a," or "the" do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" indicate that the element or object preceding "comprising" encompasses the element or object listed following "comprising" or its equivalents, and do not exclude other elements or objects. Terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are used only to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. 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, and therefore should not be construed as a limitation of this utility model.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the features in the following embodiments can be combined with each other.

[0033] Please see Figures 1 to 6 As shown, this utility model discloses a single-stage flywheel 100, which includes an inner core 2 and an outer sleeve 1 fitted onto the inner core 2. A one-way clutch mechanism is provided between the inner core 2 and the outer sleeve 1, so that the outer sleeve 1 can rotate relative to the inner core 2 in a single rotational direction. The one-way clutch mechanism includes multiple jacks 3 and multiple elastic elements 4 corresponding to the multiple jacks 3. The peripheral wall of the inner core 2 is provided with several receiving grooves 22. The jacks 3 and elastic elements 4 are installed in the receiving grooves 22 along the axial direction of the inner core 2. The peripheral wall of the inner core 2 is provided with a stepped portion 23, and the receiving grooves 22 are at least partially formed in the stepped portion 23. The single-stage flywheel 100 includes a bearing 5 disposed between the inner core 2 and the outer sleeve 1. The bearing 5 has an inner ring 52 fixedly connected to the inner core 2, an outer ring 51 fixedly connected to the outer sleeve 1, and a plurality of balls 53 disposed between the inner ring 52 and the outer ring 51. The inner ring 52 is pressed against the stepped portion 23 to restrict the jack 3 and the elastic member 4 from disengaging from the receiving groove 22 along the axial direction of the inner core 2.

[0034] The single-stage flywheel 100 provided by this utility model, because the elastic element 4 is independently set and corresponds one-to-one with the jack 3, when one jack 3 is damaged or malfunctions, it does not affect the normal operation of other jacks 3 and elastic elements 4, thus enhancing reliability during use. Furthermore, the jack 3 and elastic element 4 are installed along the axial direction of the inner core 2 in the receiving groove 22 opened in the inner core 2. A stepped portion 23 is provided on the peripheral wall of the inner core 2. The jack 3 and elastic element 4 extend to the stepped portion 23, and are pressed against the stepped portion 23 by the inner ring 52 of the bearing 5 to prevent the jack 3 and elastic element 4 from disengaging from the receiving groove 22 along the axial direction of the inner core 2, improving the convenience and reliability of assembling and disassembling the jack 3 and elastic element 4. In addition, this utility model uses a bearing 5 to replace multiple balls 53 in the traditional technology, which avoids the problem of having to reassemble multiple balls 53 one by one during disassembly and maintenance, greatly reducing the difficulty of disassembly and assembly. Moreover, as a precision independent component, the bearing 5 can effectively ensure the assembly accuracy of the flywheel, reduce the risk of foreign objects such as mud and sand entering, rotation jamming, abnormal noise caused by large assembly errors, and improve the reliability of flywheel use.

[0035] Please see Figure 1 and Figure 2 As shown, the single-stage flywheel 100 is used on the rear wheel of a bicycle to drive the rear wheel to rotate via the chain, thus propelling the bicycle forward. A single-stage flywheel, compared to a multi-stage flywheel, has a fixed transmission ratio. In this embodiment, the outer casing 1 is annular, and its outer peripheral wall is provided with several chain teeth 11 for engaging with the bicycle chain. Please refer to [link / reference]. Figure 3 and Figure 4 As shown, the inner side of the outer sleeve 1 has a first stepped ring 131 and a second stepped ring 132. The first stepped ring 131 has a toothed groove 13 that mates with the jack 3, and the second stepped ring 132 is used to support the outer ring 51 of the bearing 5. The inner side of the outer sleeve 1 is provided with an internal thread 12 for connecting the outer retaining ring 7 to fix the outer ring 51 of the bearing 5 in the axial direction. In this embodiment, the second stepped ring 132 is higher than the first stepped ring 131. When the jack 3 mates with the toothed groove 13, the top surface of the jack 3 is not higher than the first stepped ring 131, preferably flush with the first stepped ring 131. In this way, the jack 3 is lower than the second stepped ring 132, so that the outer ring 51 of the bearing 5 will not be pressed against the jack 3, ensuring the smooth movement of the jack 3.

[0036] Please see Figure 3 and Figure 6As shown, the inner core 2 is cylindrical, with a flange 24 formed at the bottom edge and an external thread 21 on the outer periphery of the top edge. A step 23 is provided between the external thread 21 and the flange 24. The external thread 21 at the top of the inner core 2 is used to install the inner retaining ring 6. The inner retaining ring 6 is threadedly connected to the inner core 2 and presses against the inner ring 52 of the bearing 5. A plurality of receiving grooves 22 are provided on the peripheral wall of the inner core 2. The receiving grooves 22 are opened along the axial direction of the inner core 2, and some of the receiving grooves 22 are opened on the step 23. In this embodiment, the receiving groove 22 includes an assembly groove 221, an abutment groove 222, and a pivot groove 223. A support protrusion 224 is provided between the assembly groove 221 and the abutment groove 222.

[0037] Please continue reading. Figure 3 and Figure 6 As shown, the one-way clutch mechanism consists of multiple jacks 3 and corresponding elastic elements 4. In this embodiment, the jack 3 includes a pivot portion 31 and a pawl portion 32. The pivot portion 31 is installed in the pivot groove 223, and the pawl portion 32 extends out of the receiving groove 23 to cooperate with the tooth groove 13 to achieve one-way locking. In this embodiment, the elastic element 4 is a metal spring sheet, which includes an assembly portion 41 for mounting on the inner core 2 and a deformable portion 42 for elastically abutting against the jack 3. The deformable portion 42 includes an arc segment, and the jack 3 contacts it along the tangent direction of the arc segment. Specifically, the elastic element 4 is a metal spring sheet that is approximately "3" shaped, which includes an assembly portion 41, a deformable portion 42, and a connecting portion 43 connecting the assembly portion 41 and the deformable portion 42. The assembly portion 41 and the deformable portion 42 constitute two arc portions of the "3" shape, and the connecting portion 43 constitutes the concave portion between the two arc portions of the "3" shape. The assembly part 41 is fixed in the assembly groove 221, and the arc segment of the deformable part 42 abuts against the pawl part 32 along the tangential direction, so that it can smoothly abut against the abutment groove 222 when pressed. The abutment groove 222 is arc-shaped to accommodate the deformable part 42 after deformation. The support protrusion 224 remains abutting against the connection between the assembly part 41 and the deformable part 42, that is, the support protrusion 224 provides support for the connecting part 43 to provide a fulcrum for deformation. In this embodiment, both the assembly groove 221 and the pivot groove 223 are large arc grooves to limit the elastic element 4 and the jack 3 from disengaging radially from the receiving groove 23.

[0038] Please see Figure 3 and Figure 5As shown, the bearing 5 includes an inner ring 52, an outer ring 51, and balls 53. In this embodiment, the inner ring 52 is pressed onto the stepped portion 23 by a washer 8, so as to restrict the axial displacement of the jack 3 and the elastic element 4 together with the flange portion 24. In this embodiment, when the elastic element 4 and the jack 3 are assembled in the receiving groove 23, their top ends do not protrude above the stepped portion 23 to avoid being crushed by the inner ring 52 and thus hindering their movement. The inner retaining ring 6 is provided with an internal thread, which is threadedly connected and fixed to the external thread 21 on the inner core 2 and presses the inner ring 52; the outer retaining ring 7 is provided with an external thread, which is connected and fixed to the internal thread 12 on the outer sleeve 1 and presses the outer ring 51. The top surfaces of the inner retaining ring 6 and the outer retaining ring 7 are provided with several operating holes, which can be inserted into the operating holes to tighten or loosen the inner and outer retaining rings. There is a gap between the inner retaining ring 6 and the outer retaining ring 7 to prevent mutual friction between the two retaining rings. Due to the presence of the gap, there is a risk of foreign objects entering. Therefore, in this embodiment, a shielding plate 54 is further provided at the end face of the bearing 5 to shield the gap between the inner ring 52 and the outer ring 51 of the bearing 5, so as to reduce the risk of foreign objects entering the bearing 5 and the one-way clutch mechanism.

[0039] Please see Figure 3 and Figure 5 As shown, during assembly, the elastic element 4 and the jack 3 are assembled from top to bottom along the axial direction of the inner core 2 into the receiving groove 22; the washer 8 is sleeved on the inner core 2 and supported on the stepped portion 23 of the inner core 2; the bearing 5 is sleeved on the inner core 2 from top to bottom along the axial direction, the inner core 2 and the bearing 5 are assembled on the inner side of the outer sleeve 1, and the lower end of the bearing 5 is supported on the second stepped ring 132 of the outer sleeve 1 and the stepped portion 23 of the inner core 2; the inner retaining ring 6 and the outer retaining ring 7 are respectively connected to the inner core 2 and the outer sleeve 1 to press the bearing 5 on top of the bearing 5, thus completing the assembly.

[0040] In the assembled state, the pawl 32 of the jack 3 maintains a meshing tendency with the toothed groove 13 of the outer sleeve 1 under the action of the elastic element 4. When the outer sleeve 1 rotates forward, the toothed groove 13 pushes the pawl 32 to drive the inner core 2 to rotate synchronously; when the outer sleeve 1 rotates in the reverse direction, the pawl 32 compresses the elastic element 4 under the action of the inclined surface of the toothed groove 13 to achieve retraction, and the inner core 2 is not driven by the rotation of the outer sleeve 1, resulting in relative movement between the outer sleeve 1 and the inner core 2. During the movement, the bearing 5 ensures smooth rotation.

[0041] As described above in the specific embodiments, this utility model utilizes an independently configured elastic element 4 and a jack 3 cooperation structure. The independently configured elastic element 4 ensures that each jack 3 does not affect the others, enabling independent operation of a single clutch unit. When a jack 3 or elastic element 4 fails, the remaining units can still operate normally, significantly improving reliability. Furthermore, the standardized design of the bearing 5 replaces the traditional split ball bearing structure. The bearing 5 cooperates with the stepped portion 23 to restrict the assembly position of the one-way clutch mechanism. Combined with the axial locking method of the inner retaining ring 6 and outer retaining ring 7, this simplifies the disassembly and assembly process and ensures high overall assembly accuracy, effectively avoiding jamming and abnormal noise problems caused by assembly errors in traditional structures. During maintenance, the inner and outer retaining rings are removed, and the bearing 5 is completely removed, allowing for independent replacement of a single jack 3 or elastic element 4 without affecting the assembly of other jacks 3 or elastic elements 4. Compared to the cumbersome process of disassembling and assembling pawls and balls one by one in traditional structures, maintenance efficiency is significantly improved.

[0042] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A single-stage flywheel, comprising an inner core and an outer sleeve fitted onto the inner core, wherein a one-way clutch mechanism is provided between the inner core and the outer sleeve, so that the outer sleeve can rotate relative to the inner core in a single rotational direction, characterized in that, The one-way clutch mechanism includes multiple jacks and multiple elastic elements corresponding to the multiple jacks; The inner core has several receiving grooves on its peripheral wall. The jack and elastic element are installed in the receiving grooves along the axial direction of the inner core. The inner core has a stepped portion on its peripheral wall, and the receiving grooves are at least partially opened in the stepped portion. The single-stage flywheel includes a bearing disposed between the inner core and the outer sleeve. The bearing has an inner ring fixedly connected to the inner core, an outer ring fixedly connected to the outer sleeve, and a plurality of balls disposed between the inner ring and the outer ring. The inner ring is pressed against the stepped portion to restrict the jack and the elastic element from disengaging from the receiving groove along the axial direction of the inner core.

2. The single-stage flywheel as described in claim 1, characterized in that, The elastic element is a metal spring sheet, which includes an assembly part for mounting on the inner core and a deformable part for elastically abutting the jack. The deformable part includes an arc segment, and the jack contacts it along the tangential direction of the arc segment.

3. The single-stage flywheel as described in claim 2, characterized in that, The receiving groove includes an assembly groove for accommodating the assembly part and an abutment groove for the deformable part to abut against when it is pressed. A support protrusion is provided between the assembly groove and the abutment groove, and the support protrusion is held against the connection between the assembly part and the deformable part.

4. The single-stage flywheel as described in claim 3, characterized in that, The elastic element is shaped like the number "3", and the abutment groove is arc-shaped.

5. The single-stage flywheel as described in claim 3, characterized in that, The jack includes a pivot portion for pivotally connecting to the inner core and a pawl portion for engaging with the outer casing. The pawl portion elastically abuts against the deformable portion. The receiving groove includes a pivot groove for accommodating the pivot portion. Both the assembly groove and the pivot groove are superior arc grooves to restrict the elastic element and the jack from disengaging radially along the superior arc groove.

6. The single-stage flywheel as described in claim 1, characterized in that, The single-stage flywheel includes a washer disposed on the stepped portion, and the inner ring of the bearing is supported on the stepped portion by the washer.

7. The single-stage flywheel as described in claim 6, characterized in that, The single-stage flywheel includes an inner retaining ring sleeved on the outside of the inner core. The inner retaining ring is threadedly connected to and fixed to the inner core, pressing against the inner ring of the bearing.

8. The single-stage flywheel as described in claim 7, characterized in that, The single-stage flywheel includes an outer retaining ring disposed on the inner side of the outer casing. The outer retaining ring is threadedly connected to and fixed to the outer casing, pressing against the outer ring of the bearing. There is a gap between the inner retaining ring and the outer retaining ring.

9. The single-stage flywheel as described in claim 1, characterized in that, The inner side of the outer sleeve has a first stepped ring and a second stepped ring that is higher than the first stepped ring. The first stepped ring has a toothed groove that cooperates with the jack to achieve one-way locking. The outer ring of the bearing is pressed against the second stepped ring.

10. The single-stage flywheel as described in claim 1, characterized in that, A shielding plate is provided at the end face of the bearing to block the gap between the inner and outer rings of the bearing.

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