An elastic control structure

Abstract

The application discloses an elastic control structure, which comprises a ratchet wheel, a centrifugal part capable of rotating around a first axis, a pawl part capable of elastically rotating around a second axis through a first elastic part, a second elastic part capable of rotating around a third axis and connected with the centrifugal part, the centrifugal part is directly abutted with the pawl part, or is abutted with the pawl part through the first elastic part, or is abutted with the pawl part through a linkage part; one end of the second elastic part is movably connected with the centrifugal part and a force point is arranged between the two, the force point is arranged between the first axis and the third axis, and the force exerted by the second elastic part on the centrifugal part is perpendicular to the contact surface of the two; when the pawl part is moved from a first position of being disengaged from the ratchet wheel to a second position of being engaged with the ratchet wheel, the distance between the force exerted by the second elastic part on the centrifugal part through the force point and the first axis is shortened. According to the elastic control structure, when the pawl part is moved from the first position to the second position, the torque exerted by the second elastic part on the centrifugal part gradually decreases.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of elastic control structures. BACKGROUND

[0002] When bicycle travels, generally shift by centrifugal shift gear, pawl piece is released from ratchet wheel under the action of centrifugal piece, when the speed of riding increases, centrifugal piece is released pawl piece under the action of centrifugal force, so that pawl piece is engaged with ratchet wheel under the action of elastic force, and shift is realized.When shifting, centrifugal piece needs to overcome the torque of torsional spring acting on it to control its initial position.

[0003] In prior art, the torque of torsional spring acting on centrifugal piece gradually increases when shifting, and centrifugal piece needs to provide larger centrifugal force to successfully shift, so that shifting is more difficult and stability is relatively poor. SUMMARY

[0004] The purpose of the present application is to provide a kind of elastic control structure, when pawl piece moves from first position to second position, the torque of second elastic piece gradually decreases, which is needed to be overcome by centrifugal piece, centrifugal piece can overcome this torque under the action of centrifugal force, so that pawl piece is engaged with ratchet wheel under the action of first elastic piece, and the position switching of pawl piece is relatively simple, and stability is relatively good.

[0005] To achieve the above purpose, the technical scheme adopted by the present application is:

[0006] A kind of elastic control structure, including ratchet wheel that can rotate around its own axial direction, centrifugal piece that can rotate around first axial line, pawl piece that can be elastically rotated around second axial line by first elastic piece, second elastic piece that can rotate around third axial line and is connected with the centrifugal piece, the centrifugal piece can be directly abutted with pawl piece, or the centrifugal piece can be elastically abutted with pawl piece through first elastic piece, or the centrifugal piece can be rigidly abutted with pawl piece through linkage piece;

[0007] The first elastic piece is used to provide elastic force to drive pawl piece to engage with ratchet wheel, the second elastic piece is used to provide elastic force to drive centrifugal piece to control pawl piece to move away from ratchet wheel, and the centrifugal piece is used to overcome the elastic force of second elastic piece when rotating;

[0008] One end of the second elastic piece is movably connected with the centrifugal piece, and there is a force point between the two, the force point is located between first axial line and third axial line, and the force of second elastic piece acting on centrifugal piece through the force point is perpendicular to the contact surface of the two;

[0009] The pawl member has a disengaged first position and an engaged second position relative to the ratchet wheel, and when the pawl member moves from the first position to the second position, the second elastic member exerts a force on the centrifugal member through the force point, and the distance between the force and the first axis line is shortened.

[0010] Preferably, the first axis line and the second axis line coincide with each other.

[0011] Preferably, the force exerted by the second elastic member on the centrifugal member through the force point is perpendicular to the first axis line.

[0012] Preferably, when the pawl member moves from the first position to the second position, the force point is always located on the same side of the first axis line.

[0013] Preferably, when the pawl member moves from the first position to the second position, the distance between the force point and the third axis line increases.

[0014] Preferably, the centrifugal member comprises a first body and a counterweight part connected to each other, and the first axis line passes through the first body.

[0015] More preferably, the counterweight part is located on the side of the third axis line away from the first axis line, and when the pawl member moves from the first position to the second position, the counterweight part rotates away from the ratchet wheel.

[0016] More preferably, the second elastic member is a second torsional spring, and the second torsional spring comprises a force exerting end movably connected to the first body, and when the pawl member moves from the first position to the second position, the force exerting end rotates away from the ratchet wheel.

[0017] Still more preferably, the centrifugal member further comprises a hooking part provided on the first body, and the force exerting end movably penetrates the hooking part in the direction of its own length.

[0018] Preferably, the centrifugal member is arc-shaped protruded in the direction away from the ratchet wheel, and the second elastic member is provided on the side of the centrifugal member away from the ratchet wheel.

[0019] Thanks to the use of the above technical scheme, the present application has the following advantages compared with the prior art: the elastic control structure of the present application sets the force point between the first axis line and the third axis line, and when the pawl member moves from the first position to the second position, the distance between the force exerted by the second elastic member on the centrifugal member through the force point and the first axis line is shortened, the torque exerted by the second elastic member on the centrifugal member is reduced, and a relatively small centrifugal force applied to the centrifugal member can overcome the torque exerted by the second elastic member, so that the pawl member is engaged with the ratchet wheel under the action of the first elastic member, the position switching of the pawl member is relatively simple, and the stability is relatively good. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 2 is a structural schematic diagram of a first elastic control structure according to an embodiment of the present application; Figure 1 Figure 3 is a structural schematic diagram of a second elastic control structure according to an embodiment of the present application;

[0021] Figure 4 is a partial exploded schematic diagram of the first elastic control structure according to an embodiment of the present application; Figure 2 Figure 5 is a partial exploded schematic diagram of the second elastic control structure according to an embodiment of the present application;

[0022] Figure 6 is a structural schematic diagram of a pawl in a first position relative to a ratchet according to an embodiment of the present application; Figure 3 Figure 7 is a structural schematic diagram of the pawl in a second position relative to the ratchet according to an embodiment of the present application;

[0023] Figure 8 is a structural schematic diagram of a third elastic control structure according to an embodiment of the present application; Figure 4 Figure 9 is a structural schematic diagram of a fourth elastic control structure according to an embodiment of the present application.

[0024] Wherein: 1, hub; 2, ratchet; 3, centrifugal member; 31, first body; 32, counterweight portion; 33, hooking portion; 4, second elastic member; 41, force applying end; 42, fixed end; 5, force point; 6, first shaft; 7, third shaft; 8, connecting seat; 9, pawl; 91, force receiving end; 92, pawl end; 10, first elastic member. DETAILED DESCRIPTION

[0025] The technical solutions of the present application will be further described below in conjunction with specific embodiments and the accompanying drawings.

[0026] In the following, only certain exemplary embodiments are described briefly. As will be realized by those skilled in the art, the described embodiments can be modified in various different ways without departing from the spirit or scope of embodiments of the present application. The drawings and description are, therefore, to be considered in all respects only as illustrative and not restrictive.

[0027] In the description of embodiments of the present application, it needs to be understood that the terms "length", "inner", and the like indicate the orientation or positional relationship shown based on the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0028] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0029] In the embodiments of the present application, unless specifically defined and limited otherwise, the terms "mount", "connect", "connection", "fix", and like terms should be construed broadly and, for example, can be fixed connection, detachable connection, or integral; can be mechanical connection, electrical connection, or communication; can be direct connection, or indirect connection through an intermediate medium; can be internal connection of two elements, or interaction relationship between two elements. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application according to the specific circumstances.

[0030] In the embodiments of the present application, unless specifically defined and limited otherwise, "on" or "under" of a first feature to a second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "over" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. "Under", "below" and "underneath" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0031] The following disclosure provides many different embodiments or examples for implementing different structures of the embodiments of the present application. In order to simplify the disclosure of the embodiments of the present application, the components and arrangements of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the embodiments of the present application. In addition, the embodiments of the present application can repeatedly refer to numerals and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and / or arrangements discussed.

[0032] Referring to Figures 1-4 As shown, the present embodiment provides a flexible control structure for bicycle gear shifting, which is installed in a hub 1. The flexible control structure includes a ratchet wheel 2 rotatably arranged in the hub 1 about an axis of the ratchet wheel 2, a centrifugal element 3 rotatable about a first axis, a pawl element 9 elastically rotatable about a second axis by a first elastic element 10, and a second elastic element 4 rotatable about a third axis and arranged in the hub 1. The first elastic element 10 is used to provide an elastic force to drive the pawl element 9 to engage with the ratchet wheel 2.

[0033] The centrifugal element 3 can directly abut against the pawl element 9, or the centrifugal element 3 can elastically abut against the pawl element 9 through the first elastic element 10, or the centrifugal element 3 can rigidly abut against the pawl element 9 through a linkage when the centrifugal element 3 rotates. In the present embodiment, the first axis and the second axis coincide with each other, and the centrifugal element 3 and the pawl element 9 can elastically abut against each other through the first elastic element 10.

[0034] See Figure 1 As shown, a connecting seat 8 is provided inside the hub 1. The connecting seat 8 contains a first shaft 6 and a third shaft 7. The centrifugal member 3 and the ratchet member 9 can rotate around the first shaft 6, while the second elastic member 4 can rotate around the third shaft 7. The centerline of the first shaft 6 is the first axis line, and the centerline of the third shaft 7 is the third axis line. The centerlines of the hub 1 and the ratchet 2 coincide and are parallel to the first and third axis lines. The second elastic member 4 is a second torsion spring, which includes a force-applying end 41 movably connected to the centrifugal member 3 and a fixed end 42 abutting against the inside of the connecting seat 8.

[0035] In this embodiment, the centrifugal element 3 is located on the side of the ratchet 2, and the centrifugal element 3 protrudes in an arc shape away from the ratchet 2. The second elastic element 4 is located on the side of the centrifugal element 3 away from the ratchet 2.

[0036] See Figure 2 As shown, the centrifugal component 3 includes a first body 31 and a counterweight 32 connected to each other. The pawl 9 is elastically pressed against the first body 31. In this embodiment, the first elastic component 10 is a first torsion spring. The pawl 9 and the first body 31 are elastically pressed against each other through the first torsion spring. The first torsion spring is sleeved on the first shaft 6, and its two ends are respectively pressed against the pawl 9 and the first body 31.

[0037] See Figure 2 As shown, the pawl member 9 includes a force-receiving end 91 for abutting against the first body 31 and a pawl end 92 for engaging with the ratchet 2. The force-receiving end 91 and the pawl end 92 are located on opposite sides of the first axis. The first axis passes through the first body 31, and the pawl end 92 and the counterweight 32 are respectively located on opposite sides of the first axis. When one of the pawl end 92 and the counterweight 32 rotates closer to the ratchet 2, the other rotates away from the ratchet 2. The centrifugal member 3 also includes a hook portion 33 provided on the first body 31. The force-applying end 41 is movably inserted into the hook portion 33 along its own length extension direction. The hook portion 33 is used to prevent the force-applying end 41 from disengaging from the centrifugal member 3 along the force-applying direction.

[0038] The second elastic element 4 is used to provide an elastic force through the force-applying end 41 to drive the centrifugal element 3 to control the pawl element 9 to move away from the ratchet 2. In this embodiment, the force-applying end 41 and the pawl end 92 are respectively located on both sides of the first axis. The second elastic element 4 drives the first body 31 to press against the force-receiving end 91 through the force-applying end 41, so that the pawl end 92 rotates away from the ratchet 2.

[0039] When the rotational speed of hub 1 reaches a certain value, counterweight 32 rotates away from ratchet 2 under the action of centrifugal force, so that centrifugal component 3 can overcome the force applied to it by second elastic component 4, so that first body 31 moves away from force end 91, so as to release pawl component 9, so that pawl end 92 of pawl component 9 rotates close to ratchet 2 and engages with it under the action of elastic force of first elastic component 10.

[0040] See Figures 3-4 As shown, there is a force application point 5 between the force application end 41 and the centrifugal member 3. The force application point 5 is located between the first axis and the third axis. The force applied by the second elastic member 4 to the centrifugal member 3 through the force application point 5 is perpendicular to the contact surface between the two. In this embodiment, the force application end 41 is a straight segment, and the force applied by the second elastic member 4 to the centrifugal member 3 through the force application point 5 is perpendicular to the force application end 41 and the first axis.

[0041] In this embodiment, the counterweight 32 is located on the side of the third axis away from the first axis. When the counterweight 32 rotates away from the ratchet 2 under the action of centrifugal force, it drives the hook 33 to rotate away from the ratchet 2, and causes the hook 33 to rotate around the first axis away from the third axis. The greater the distance between the hook 33 and the third axis, that is, the greater the distance between the point of force 5 and the third axis, the smaller the elastic force of the second torsion spring on the first body 31 through the point of force 5.

[0042] The pawl 9 has a first disengaged position and a second engaged position relative to the ratchet 2. See also Figure 3 As shown, the pawl 9 disengages from the ratchet 2, and the second elastic element 4 applies a force F1 to the first body 31 in a downward-left direction, with a lever arm of d1 and a point of application of force A1; see also Figure 4 As shown, the pawl 9 meshes with the ratchet 2, and the second elastic element 4 applies a force F2 to the first body 31 in the direction of downward left, with a lever arm of d2 and a point of force 5 of A2.

[0043] When the pawl 9 moves from the first position to the second position, the distance between the force exerted by the second elastic element 4 on the centrifugal element 3 through the force point 5 and the first axis shortens, that is, the lever arm of the force exerted by the second elastic element 4 on the centrifugal element 3 through the force point 5 shortens (d2 is less than d1), and the distance between the hook part 33 and the third axis increases (that is, the distance between A2 and the third axis is greater than that between A1 and A1). Since the torque M is equal to F multiplied by d, during the engagement of the pawl 9 and the ratchet 2, not only does the elastic force F exerted by the second elastic element 4 on the hook part 33 decrease, but the lever arm d also decreases. That is, the torque that the pawl 9 needs to overcome the elastic force of the second elastic element 4 decreases, and a smaller centrifugal force can be applied to the counterweight 32 to achieve the position switching of the pawl 9. The position switching is relatively simple and easy, and the stability is relatively high.

[0044] When this elastic control structure is applied to bicycles, centrifugal shifting can be achieved without heavy pedaling, making shifting simple and easy, and with relatively high stability.

[0045] See Figures 3-4 As shown, when the pawl 9 moves from the first position to the second position, the point of force 5 is always located on the right side of the first axis; the force-applying end 41 rotates away from the ratchet 2 and moves toward the fixed end 42 of the second torsion spring.

[0046] The working process of this embodiment is described in detail below:

[0047] Before shifting gears, the wheel hub 1 rotates slowly, and the centrifugal force of the counterweight 32 is insufficient to support it to overcome the torque applied by the second elastic member 4. At this time, under the action of the second elastic member 4, the counterweight 32 of the centrifugal member 3 is in a position close to the ratchet 2, and the first body 31 and the force-bearing end 91 are elastically pressed together, so that the pawl end 92 is away from the ratchet 2, and the pawl member 9 and the ratchet 2 are in a disengaged state.

[0048] When shifting gears, when the rotational speed of the hub 1 reaches a certain value, the counterweight 32, under the action of centrifugal force, overcomes the elastic force of the second elastic element 4 and moves away from the ratchet 2. The centrifugal element 3 rotates around the axis of the first shaft 6. At this time, the centrifugal element 3 releases the pawl 9, that is, the first body 31 disengages from the force-bearing end 91 of the pawl 9. Under the action of the first elastic element 10, the pawl end 92 of the pawl 9 rotates towards the ratchet 2 and engages with the ratchet 2, thereby realizing gear shifting.

[0049] During gear shifting, the torque applied by the second elastic element 4 to the centrifugal element 3 gradually decreases, providing a small centrifugal force to achieve stable gear shifting.

[0050] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An elastic control structure, comprising a ratchet wheel rotatable about an axis of the ratchet wheel, a centrifugal element rotatable about a first axis, a pawl element elastically rotatable about a second axis by a first elastic element, and a second elastic element rotatable about a third axis and connected to the centrifugal element, the centrifugal element being in direct abutment with the pawl element, or the centrifugal element being in elastic abutment with the pawl element via the first elastic element, or the centrifugal element being in rigid abutment with the pawl element via a linkage; the first elastic element being configured to provide an elastic force to drive the pawl element into engagement with the ratchet wheel, and the second elastic element being configured to provide an elastic force to drive the centrifugal element to control the pawl element to move away from the ratchet wheel, the centrifugal element being configured to overcome the elastic force of the second elastic element when rotating; characterized in that: one end of the second elastic element is movably connected to the centrifugal element, and a force point is provided between the one end of the second elastic element and the centrifugal element, the force point being provided between the first axis and the third axis, and the force of the second elastic element applied to the centrifugal element via the force point being perpendicular to the contact surface between the second elastic element and the centrifugal element. the pawl element has a disengaged first position and an engaged second position relative to the ratchet wheel, and when the pawl element moves from the first position to the second position, the distance between the force of the second elastic element applied to the centrifugal element via the force point and the first axis is shortened. the first axis and the second axis coincide with each other. the force of the second elastic element applied to the centrifugal element via the force point is perpendicular to the first axis.

2. The elastic control structure of claim 1, wherein: when the pawl element moves from the first position to the second position, the force point is always located on the same side of the first axis.

3. The elastic control structure of claim 1, wherein: when the pawl element moves from the first position to the second position, the distance between the force point and the third axis increases.

4. The elastic control structure of claim 1, wherein: the centrifugal element comprises a first body and a counterweight part movably connected to each other, and the first axis passes through the first body.

5. The elastic control structure of claim 1, wherein: the counterweight part is provided on the side of the third axis away from the first axis, and when the pawl element moves from the first position to the second position, the counterweight part rotates away from the ratchet wheel.

6. The elastic control structure of claim 1, wherein: the second elastic element is a second torsion spring, and the second torsion spring comprises a force applying end movably connected to the first body, and when the pawl element moves from the first position to the second position, the force applying end rotates away from the ratchet wheel.

7. The elastic control structure of claim 6, wherein: the centrifugal element further comprises a hooking part provided on the first body, and the force applying end is movably arranged in the hooking part along the length direction of the force applying end.

8. The elastic control structure of claim 6, wherein: the centrifugal element is arc-shaped protruded away from the ratchet wheel, and the second elastic element is provided on the side of the centrifugal element away from the ratchet wheel.

9. The elastic control structure of claim 8, wherein: ​ 10. The elastic control structure of claim 1, wherein: ​

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