Low resistance transmission mechanism and bicycle

Abstract

The invention discloses a low-resistance transmission mechanism and a bicycle. The low-resistance transmission mechanism comprises a middle shaft, a tower base sleeved on the middle shaft and a hub body, wherein a plurality of movable claws are formed on the tower base; an inner tooth ring is formed on the hub body; a magnetic assembly comprises a first magnetic piece formed in the hub body and a second magnetic piece connected to the tower base; the first magnetic piece comprises a plurality of first magnetic parts distributed in an annular manner, a plurality of second magnetic parts are formed on the second magnetic piece, and the second magnetic piece is rotatably connected relative to the tower base within an angle range; in a riding state, the movable claw is released and meshed with the inner tooth ring on the hub body, driving the hub body to rotate and achieving the purpose of transmission; in a non-riding state, the first magnetic piece drives the second magnetic piece to rotate in the opposite direction, and the movable claw is completely separated from the inner tooth ring under the action of the corresponding second magnetic part, thereby reducing the contact between the movable claw and the inner tooth ring, reducing the mutual wear and avoiding noise.

Description

Technical Field

[0001] The invention belongs to the technical field of wheel hubs, and in particular relates to a low-resistance transmission mechanism and a bicycle. Background Art

[0002] In order to achieve power transmission between the freewheel base and the hub body, a one-way transmission mechanism is provided between the freewheel base and the hub body. The common one-way transmission mechanism uses a spring sheet to provide reset power for the ratchet, so that it can perform an overrunning clutch action with the hub shell.

[0003] When this transmission mechanism is not transmitting power, that is, in the non-riding state, there is still contact between the spring sheet and the hub shell, which causes a loud noise every time the spring sheet jumps over an inner tooth. Also for this reason, when pushing the bicycle forward or letting the bicycle move forward by inertia, the resistance generated between the hub shell and the freewheel base will be very large, which increases the wear of the spring sheet and the inner teeth and shortens the maintenance cycle. It also generates a lot of noise, resulting in a poor user experience. Summary of the invention

[0004] The purpose of the present invention is to provide a low-resistance transmission mechanism and a bicycle to solve the problems existing in the prior art that, when the existing one-way transmission mechanism is not transmitting power, there is always contact between the pawl and the ratchet wheel between the tower base and the hub body, there is severe wear between the ratchet teeth and the ratchet wheel, the maintenance cycle is short, the cost is high, and there is high noise.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0006] In one aspect, the present invention provides a low resistance transmission mechanism, comprising:

[0007] Middle axis,

[0008] A freehub, which is sleeved on the middle shaft, and has a plurality of movable claws formed along its circumference;

[0009] A hub body, which is sleeved on the middle shaft and has an inner gear ring formed thereon;

[0010] The magnetic assembly includes a first magnetic member formed in the hub body and a second magnetic member connected to the tower base; the first magnetic member includes a plurality of first magnetic portions distributed in a ring, the second magnetic member is a ring structure with a plurality of second magnetic portions dispersed thereon, and the second magnetic member is rotatably connected relative to the tower base within an angle range.

[0011] In some embodiments of the present application, a plurality of first limiting portions are formed on the tower base along its circumference, and a second limiting portion matched with each of the first limiting portions is formed on the second magnetic member. During the rotation of the second magnetic member, the second limiting portion moves relative to the first limiting portion.

[0012] In some embodiments of the present application, the first limiting portion is a limiting groove structure, and the second limiting portion is a limiting column structure correspondingly arranged in the first limiting portion.

[0013] In some embodiments of the present application, the magnetic poles of the first magnetic portion and the second magnetic portion are the same.

[0014] In some embodiments of the present application, the number of the second magnetic parts is equal to the number of the movable claws, and the number of the first magnetic parts is at least one times the number of the second magnetic parts.

[0015] In some embodiments of the present application, the first magnetic member is also an annular structure, which is sleeved on the middle shaft and connected to the hub body.

[0016] In some embodiments of the present application, an avoidance groove is formed on the tower base, and one end of the movable claw can be rotatably connected in the avoidance groove.

[0017] In some embodiments of the present application, the movable claw is made of metal;

[0018] In the first state, the position of the second magnetic part corresponds to the movable claw one by one, and under the action of the second magnetic part, the movable claw is retracted into the avoidance groove;

[0019] In the second state, each of the second magnetic parts on the second magnetic member rotates to between the adjacent movable claws, and the movable claws extend out of the avoidance groove under the action of the second magnetic member.

[0020] In another aspect, the present invention further provides a bicycle, which includes the low-resistance transmission mechanism mentioned above.

[0021] In some embodiments of the present application, in the riding state, the initial rotation speed of the freewheel base is greater than that of the hub body. At this time, the second limiting portion rotates to the first end of the first limiting portion, and the second magnetic portion rotates to between the corresponding adjacent movable claws. The adsorption effect of the second magnetic portion on the movable claw disappears, and the movable claw extends from the avoidance groove and engages with the inner gear ring, driving the hub body to rotate.

[0022] In the non-riding state, the rotation speed of the hub body is greater than that of the tower base. In this state, the first magnetic member drives the second magnetic member to rotate in the opposite direction to the second end of the first limiting portion, and the second magnetic portion rotates to the position corresponding to the movable claw, so that the movable claw is adsorbed into the avoidance groove and disengaged from the inner gear ring.

[0023] Compared with the prior art, the advantages and positive effects of the present invention are:

[0024] The low-resistance transmission mechanism and bicycle involved in the present application realize transmission between the freewheel base and the hub body through a magnetic component. In the riding state, the movable claw is released and meshes with the inner gear ring on the hub body, driving the hub body to rotate and achieving the transmission purpose; in the non-riding state, the first magnetic part drives the second magnetic part to rotate in the opposite direction, and the movable claw is completely separated from the inner gear ring under the action of the corresponding second magnetic part, thereby reducing the contact between the movable claw and the inner gear ring, reducing the mutual wear and avoiding noise.

[0025] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become more clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a three-dimensional schematic diagram of the external structure of an embodiment of the low-resistance transmission mechanism proposed by the present invention;

[0028] Figure 2 A schematic plan view of the external structure of an embodiment of the low-resistance transmission mechanism proposed by the present invention;

[0029] Figure 3 yes Figure 2 AA section view in;

[0030] Figure 4 It is a cross-sectional structural diagram of an embodiment of a low-resistance transmission mechanism;

[0031] Figure 5 Schematic diagram of the connection state between the inner gear ring and the movable claw;

[0032] Figure 6 is a schematic diagram of the structure of the second magnetic member;

[0033] Figure 7 is a schematic diagram of the structure of the first magnetic member;

[0034] Figure 8 is a schematic diagram of the position of the first connecting part;

[0035] Fig. 9 It is a schematic diagram of the structure of the movable claw and the avoidance groove;

[0036] Fig.10 Schematic diagram of the second limiter and the movable claw in the riding state;

[0037] Fig.11 It is a schematic diagram of the second limit member and the movable claw in the non-riding state.

[0038] In the figure,

[0039] 100, central axis;

[0040] 200, tower base;

[0041] 210, movable claw;

[0042] 220, avoidance slot;

[0043] 230, first limiting portion; 231, first end; 232, second end;

[0044] 300, hub body;

[0045] 310, internal gear ring;

[0046] 320, bearings;

[0047] 330, first connecting portion;

[0048] 400, magnetic component;

[0049] 410, first magnetic member; 411, first magnetic portion; 412, second connecting portion;

[0050] 420, second magnetic member; 421, second magnetic portion; 422, second limiting portion. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0052] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and 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 should not be understood as a limitation on the present application.

[0053] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0054] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0055] In the present invention, unless otherwise clearly stipulated and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0056] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed.

[0057] refer to Figure 1-Figure 4The present application proposes a low-resistance transmission mechanism and a bicycle. The low-resistance transmission mechanism is installed at the front wheel or the rear wheel of the bicycle.

[0058] The low-resistance transmission mechanism includes a middle shaft 100 that serves as a rotational connection, a freewheel base 200 sleeved on the middle shaft 100 , a hub body 300 , and a magnetic assembly 400 for connecting the freewheel base 200 and the hub body 300 .

[0059] In order to ensure smooth rotation, bearings 320 are provided between the freehub base 200 and the hub body 300 and the middle shaft 100 .

[0060] An inner gear ring 310 is formed on the hub body 300 , and a plurality of inner teeth are formed in the inner gear ring 310 ; the inner gear ring 310 can be directly machined in the hub body 300 , or can be separately machined and manufactured and then installed on the hub body 300 .

[0061] One implementation method is: an internal thread is formed on the hub body 300, the inner gear ring 310 is processed separately, an external thread is formed outside the inner gear ring 310, and the inner gear ring 310 is connected to the hub body 300 through threads.

[0062] The freewheel base 200 is formed with a plurality of movable claws 210 along its circumference. The movable claws 210 can mesh with the inner gear ring 310 to achieve a transmission connection between the freewheel base 200 and the hub body 300 .

[0063] Specifically, a plurality of avoidance grooves 220 are formed around the tower base 200, and the movable claws 210 are respectively arranged in the corresponding avoidance grooves 220, one end of the movable claw 210 is connected to the tower base 200, and a section of the movable claw 210 lies in the avoidance groove 220 after being subjected to force.

[0064] refer to Figure 5-Figure 7 The magnetic assembly 400 is installed between the hub body 300 and the freewheel base 200, and includes a first magnetic member 410 formed in the hub body 300 and a second magnetic member 420 connected to the freewheel base 200.

[0065] The first magnetic member 410 and the second magnetic member 420 are both positive or negative poles, and generate a repulsive force between each other, so that they can be in contact and connected with the hub body 300 and the freewheel base 200 that are in contact with each other.

[0066] In addition to the axial interaction force generated between the first magnetic member 410 and the second magnetic member 420 , during the rotation of one of the magnetic members, the force also acts on the other magnetic member, causing it to rotate to a certain extent.

[0067] The first magnetic member 410 may be directly fixed to the hub body 300 . For the convenience of processing, the first magnetic member 410 may also be connected therein by assembly.

[0068] refer to Figure 8 In one embodiment of the present application, a first connecting portion 330 is formed in the hub body 300, and a second connecting portion 412 is formed on the first magnetic member 410. The first connecting portion 330 is a slot structure formed in the hub body 300 and extending along the axial direction, and the second connecting portion 412 is a connecting protrusion formed at one end of the first magnetic member 410.

[0069] In the installed state, the second connecting portion 412 is inserted into the first connecting portion 330 to achieve the connection between the first magnetic member 410 and the hub body 300 .

[0070] In addition to the above-mentioned assembly method, the first magnetic member 410 may also be formed by directly fixing the plurality of first connection parts 330 to the hub body 300 .

[0071] In order to realize the movement control of each movable claw 210 by the second magnetic member 420, the second magnetic member 420 includes a plurality of second magnetic parts 421 distributed in a ring. The second magnetic member 420 is a ring structure. The number of the second magnetic parts 421 corresponds to the movable claw 210 one by one, and the spacing between them is the same.

[0072] In order to limit the rotation angle of the second magnetic member 420 , a plurality of first limiting portions 230 are formed on the tower base 200 along its circumference, and a second limiting portion 422 matched with each first limiting portion 230 is formed on the second magnetic member 420 .

[0073] During the rotation of the second magnetic member 420 , the second limiting portion 422 moves relative to the first limiting portion 230 .

[0074] Specifically, the first limiting portion 230 is a limiting groove structure formed on the end surface of the tower base 200 that contacts the second magnetic member 420 and extends along the axial direction.

[0075] refer to Fig. 9 The second limiting portion 422 is a limiting column structure correspondingly arranged in the first limiting portion 230 . In the connected state, the second limiting portion 422 extends into the first limiting portion 230 .

[0076] During the circumferential rotation of the second magnetic member 420 , the second limiting portion 422 moves within the first limiting portion 230 . The two moving ends of the first limiting portion 230 are defined as the first end 231 and the second end 232 . Therefore, the second limiting portion 422 can only move between the first end 231 and the second end 232 .

[0077] The number of the second magnetic parts 421 corresponds to the movable claws 210 one by one, and the number of the first magnetic parts 411 is at least one times that of the second magnetic parts 421 and is evenly distributed to ensure a balanced magnetic field.

[0078] The movable claw 210 is made of metal, and each second magnetic portion 421 on the second magnetic member 420 is located below the movable claw 210. When the positions of the second magnetic portions 421 and the movable claw 210 correspond one by one, the movable claw 210 is attracted downward into the avoidance groove 220 under the action of magnetic force.

[0079] That is, during the angular rotation of the second magnetic member 420 , the movable claw 210 lies in the avoidance groove 220 or escapes from the avoidance groove 220 under the adsorption effect of the second magnetic portion 421 .

[0080] refer to Fig.10 , Fig.11 Specifically, the movable claw 210 has two working states: a first state and a second state.

[0081] In the first state, the second magnetic portion 421 rotates to a position where the second magnetic portion 421 corresponds to the movable claw 210 . Under the action of the second magnetic portion 421 , the movable claw 210 is retracted into the avoidance groove 220 .

[0082] In the second state, each second magnetic portion 421 on the second magnetic member 420 rotates to between adjacent movable claws 210 , the adsorption effect of the second magnetic portion 421 on the movable claw 210 disappears, and the movable claw 210 extends out from the avoidance groove 220 as the second magnetic portion 421 moves.

[0083] The following describes the operation of the low-resistance transmission mechanism in detail for different states of the bicycle:

[0084] In the riding state, the initial rotation speed of the tower base 200 is greater than the hub body 300. At this time, the tower base 200 rotates forward relative to the second limit member, and the second limit portion 422 on the second limit member rotates relative to the first limit portion 230 until it moves to the first end 231 of the first limit portion 230.

[0085] At this time, the second magnetic part 421 rotates to between the corresponding adjacent movable claws 210, and the movable claws 210 lock the rotation of the second magnetic part 421, extend from the avoidance groove 220, and engage with the inner gear ring 310, driving the hub body 300 to rotate.

[0086] In the non-riding state, the rotation speed of the hub body 300 is greater than that of the tower base 200. In this state, the first magnetic member 410 drives the second magnetic member 420 to rotate in the opposite direction to the second end 232 of the first limiting portion 230. At this time, the second magnetic portion 421 rotates to the position corresponding to the active claw 210, and the active claw 210 is adsorbed into the avoidance groove 220, and disengaged from the inner gear ring 310.

[0087] At this time, the movable claw 210 and the inner gear ring 310 are no longer in contact, so the noise caused by the contact can be avoided, and the wear between them is reduced, thereby improving the service life.

[0088] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0089] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A low resistance transmission mechanism, characterized in that: include: Middle axis, A freehub, which is sleeved on the middle shaft, and has a plurality of movable claws formed along its circumference, and the movable claws are made of metal; A hub body, which is sleeved on the middle shaft and has an inner gear ring formed thereon; The magnetic assembly includes a first magnetic member formed in the hub body and a second magnetic member connected to the tower base; the first magnetic member includes a plurality of first magnetic portions distributed in a ring; the second magnetic member is an annular structure with a plurality of second magnetic portions dispersed thereon, and the second magnetic member is rotatably connected relative to the tower base within an angle range.

2. The low resistance transmission mechanism according to claim 1, characterized in that: The tower base is provided with a plurality of first limiting portions along its circumference, and the second magnetic member is provided with a second limiting portion matched with each of the first limiting portions. During the rotation of the second magnetic member, the second limiting portion moves relative to the first limiting portion.

3. The low resistance transmission mechanism according to claim 2, characterized in that: The first limiting portion is a limiting groove structure, and the second limiting portion is a limiting column structure correspondingly arranged in the first limiting portion.

4. The low resistance transmission mechanism according to claim 1, characterized in that: The magnetic poles of the first magnetic part and the second magnetic part are the same.

5. The low resistance transmission mechanism according to claim 1, characterized in that: The number of the second magnetic parts is equal to the number of the movable claws, and the number of the first magnetic parts is at least one times the number of the second magnetic parts.

6. The low resistance transmission mechanism according to claim 1, characterized in that: The first magnetic member is also an annular structure, which is sleeved on the middle shaft and connected to the hub body.

7. The low resistance transmission mechanism according to claim 2, characterized in that: An avoidance groove is formed on the tower base, and one end of the movable claw can be rotatably connected in the avoidance groove.

8. The low resistance transmission mechanism according to claim 7, characterized in that: In the first state, the position of the second magnetic part corresponds to the movable claw one by one, and under the action of the second magnetic part, the movable claw is retracted into the avoidance groove; In the second state, each of the second magnetic parts on the second magnetic member rotates to between the adjacent movable claws, and the movable claws extend out of the avoidance groove under the action of the second magnetic member.

9. A bicycle, characterized in that: It includes the low resistance transmission mechanism involved in claim 8 above.

10. The bicycle according to claim 9, characterized in that In the riding state, the initial rotation speed of the freewheel base is greater than that of the hub body. At this time, the second limiting portion rotates to the first end of the first limiting portion, and the second magnetic portion rotates to between the corresponding adjacent movable claws. The adsorption effect of the second magnetic portion on the movable claw disappears, and the movable claw extends from the avoidance groove and engages with the inner gear ring, driving the hub body to rotate. In the non-riding state, the rotation speed of the hub body is greater than that of the tower base. In this state, the first magnetic member drives the second magnetic member to rotate in the opposite direction to the second end of the first limiting portion, and the second magnetic portion rotates to the position corresponding to the movable claw, so that the movable claw is adsorbed into the avoidance groove and disengaged from the inner gear ring.

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