Gear structure, gear kit and moped

Abstract

The utility model provides a gear structure, a gear set and a moped, the gear structure comprises a first gear and a second gear, the first gear and the second gear are coaxially arranged, and the material density of the first gear is larger than that of the second gear, so that the weight of the first gear is larger than that of the second gear; when the gear structure is configured to be meshed with the transmission gear, the second gear can rotate in the circumferential direction of the second gear so that a first staggered tooth angle can be formed between the second gear and the first gear, and therefore first gear teeth of the first gear and second gear teeth of the second gear can make contact with the two opposite sides of the same tooth groove of the transmission gear correspondingly, and the first staggered tooth angle is larger than zero. The gear structure, the gear kit and the moped provided by the utility model can reduce or eliminate impact noise generated due to existence of a transmission gap.

Description

TECHNICAL FIELD

[0001] The utility model relates to drive device technical field especially relates to a gear structure, gear kit and moped. BACKGROUND

[0002] When gear engagement, the close cooperation between the gear tooth and the tooth groove can effectively transmit power. But in the related art, transmission gap exists between the gear tooth and the tooth groove, on the one hand, it will cause the impact between the gear tooth and the tooth groove and produce impact noise and wear and tear and other problems, on the other hand, it will also affect the accuracy and efficiency of transmission, resulting in poor user experience. UTILITY MODEL CONTENTS

[0003] The utility model provides a kind of gear structure, gear kit and moped to reduce or eliminate the impact noise due to the existence of transmission gap.

[0004] The utility model provides a kind of gear structure, comprising:

[0005] First gearwheel;

[0006] Second gearwheel, the first gearwheel is coaxially arranged with the second gearwheel, the material density of the first gearwheel is greater than the material density of the second gearwheel, so that the weight of the first gearwheel is greater than the weight of the second gearwheel;

[0007] Wherein, when the gear structure is configured to be engaged with transmission gear, the second gearwheel can rotate in its circumferential direction to form first tooth angle between the first gearwheel, so that the first gear tooth of the first gearwheel and the second gear tooth of the second gearwheel respectively contact the opposite sides of the same tooth groove of the transmission gear, and the first tooth angle is greater than zero.

[0008] In the gear structure of the utility model embodiment, the first gearwheel and the second gearwheel are limited in the axial direction under the action of the axial limiting mechanism.

[0009] In the gear structure of the utility model embodiment, the axial limiting mechanism is limited in the form of clamping fit.

[0010] In the gear structure of the utility model embodiment, the axial limiting mechanism includes clamping part and matching part, the clamping part is arranged in one of the first gearwheel and the second gearwheel, the matching part is arranged in the other one of the first gearwheel and the second gearwheel, and the clamping part and the matching part are matched to form clamping limiting.

[0011] The gear structure of the first embodiment of this utility model has two aspects. First, the first gear and the second gear are staggered to form a first staggered angle, thereby enabling the first tooth of the first gear and the second tooth of the second gear to contact opposite sides of the same tooth groove of the transmission gear, thus eliminating transmission backlash and reducing or eliminating impact noise caused by transmission backlash, improving the user experience. Second, since the material density of the first gear is greater than that of the second gear, the weight of the first gear is greater than that of the second gear. The second gear, being lighter, rotates in its circumferential direction, causing the first gear and the second gear to form a staggered angle. The second gear has a smaller moment of inertia, resulting in a more timely and flexible backlash elimination response when dealing with different working conditions. The impact noise when the second gear engages with the transmission gear is smaller, and it also helps to reduce the overall weight of the gear structure, resulting in lower maintenance costs when worn.

[0012] The second embodiment of this utility model provides a gear structure, including:

[0013] The first gear; and

[0014] The second gear is coaxially arranged with the first gear and the second gear. One of the first gear and the second gear is provided with a snap-fit ​​part, and the other is provided with a mating part. The snap-fit ​​part and the mating part are snap-fitted together to restrict the axial relative movement between the first gear and the second gear.

[0015] Wherein, the gear structure is configured such that when it meshes with the transmission gear, the first gear and the second gear have a first tooth offset angle, such that the first tooth of the first gear and the second tooth of the second gear respectively contact the opposite sides of the same tooth groove of the transmission gear.

[0016] In the gear structure of this utility model embodiment, the material density of the first gear is greater than that of the second gear, so that the weight of the first gear is greater than that of the second gear.

[0017] The gear structure provided by the second embodiment of the utility model, on the one hand, the first gear and the second gear are relatively staggered to form a first staggered tooth angle, so that the first gear tooth of the first gear and the second gear tooth of the second gear respectively contact the opposite sides of the same tooth groove of the transmission gear, the transmission gap is eliminated, the impact noise caused by the transmission gap is reduced or eliminated, and the use experience of the user is improved. On the other hand, the two gears are axially limited through clamping to limit the axial movement between the first gear and the second gear. This limiting mode facilitates the disassembly, assembly and replacement of the first gear and the second gear, and on the other hand, the axial stability between the first gear and the second gear is ensured when the transmission gap is eliminated, and the transmission gap elimination failure caused by axial displacement is avoided.

[0018] In the gear structure of the utility model embodiment, the first gear is made of a metal material; or,

[0019] The second gear is made of a non-metal material; or,

[0020] The second gear is made of a plastic material; or,

[0021] The second gear is made of a composite material; or,

[0022] The second gear is made of a metal material; or,

[0023] The second gear is made of an alloy material; or,

[0024] The second gear is made of a porous metal material.

[0025] In the gear structure of the utility model embodiment, at least one of the following parameters of the first gear and the second gear is the same: diameter, modulus, tooth number, tooth width, pressure angle; and / or,

[0026] The thickness of the second gear corresponding in the axial direction is less than the thickness of the first gear corresponding in the axial direction; and / or,

[0027] The rigidity of the second gear is less than the rigidity of the first gear.

[0028] In the gear structure of the utility model embodiment, when the gear structure is not engaged with the transmission gear, the first gear and the second gear have a second staggered tooth angle; the first staggered tooth angle is different from the second staggered tooth angle; and / or,

[0029] The first staggered tooth angle is greater than zero and less than or equal to the angle corresponding to the gear gap formed between the transmission gear and the first gear.

[0030] In the gear structure, the first staggered tooth angle is smaller than the second staggered tooth angle; and / or,

[0031] The second staggered tooth angle is greater than zero.

[0032] In the gear structure, the first staggered tooth angle can be adjusted within a certain angle range during the process that the gear structure and the transmission gear maintain meshing transmission.

[0033] In the gear structure, the same tooth groove of the transmission gear comprises two oppositely arranged groove surfaces; during the process that the gear structure and the transmission gear maintain meshing transmission, the first gear tooth of the first gear and the second gear tooth of the second gear respectively contact the two oppositely arranged groove surfaces of the same tooth groove.

[0034] In the gear structure, the gear structure further comprises an elastic member, and the second gear can rotate in a circumferential direction under the action of a restoring force of the elastic member to form the first staggered tooth angle.

[0035] In the gear structure, the elastic member utilizes its elastic deformation to exert a circumferential rotating restoring force on the second gear.

[0036] In the gear structure, when the gear structure is not meshed with the transmission gear, the elastic member is in an initial pre-tightening state; when the gear structure is meshed with the transmission gear, the elastic member is in an energy storage state; and / or,

[0037] When the gear structure is meshed with the transmission gear, the elastic member is in a compressed state or a stretched state.

[0038] In the gear structure, the elastic member comprises at least one of the following: a torsion spring, a spring, a rubber member, a metal spring piece, and a shape memory alloy piece; and / or,

[0039] One end of the elastic member is connected to the first gear, and the other end is connected to the second gear; and / or,

[0040] The first gear and the second gear form an accommodation space therebetween.

[0041] In the gear structure, the gear structure further comprises a first limiting member, the first limiting member is arranged on one of the first gear and the second gear, the elastic member is arranged on the other one of the first gear and the second gear, and the first limiting member cooperates with the elastic member.

[0042] The utility model discloses a third embodiment provides a kind of gear kit, comprising:

[0043] The gear structure according to the first embodiment or the second embodiment; and

[0044] The transmission gear is in transmission connection with the gear structure.

[0045] In the gear set of the embodiment of the utility model, the diameter of the first gear and / or the second gear is greater than the diameter of the transmission gear; and / or,

[0046] The material density of the transmission gear is greater than the material density of the second gear, and / or, the material density of the transmission gear is equal to the material density of the first gear; and / or, the rigidity of the transmission gear is greater than the rigidity of the second gear, and / or, the rigidity of the transmission gear is equal to the rigidity of the first gear.

[0047] The utility model discloses a moped, which comprises:

[0048] A wheel device, and

[0049] A driving part;

[0050] The gear structure according to any one of the above;

[0051] The input end of the gear structure is in transmission connection with the driving part through the transmission gear, and the output end of the gear structure is in transmission connection with the wheel device, so as to provide electric power assistance to the wheel device.

[0052] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the disclosure of the embodiments of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0053] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0054] Figure 1 It is the angle structure schematic view of the gear structure provided by an embodiment of the utility model;

[0055] Figure 2 It is another angle structure schematic view of the gear structure provided by an embodiment of the utility model;

[0056] Figure 3 It is the partial structure schematic view of the transmission gear provided by an embodiment of the utility model;

[0057] Figure 4 The exploded view of the gear structure provided by an embodiment of the utility model is shown in the figure;

[0058] Figure 5 The sectional view of the gear structure provided by an embodiment of the utility model is shown in the figure;

[0059] Figure 6 The structure schematic view of the gear structure provided by an embodiment of the utility model is shown in the figure;

[0060] Figure 7 The partial structure schematic view of the gear structure provided by an embodiment of the utility model is shown in the figure, wherein the second gear and the elastic member are shown;

[0061] Figure 8 The sectional view of the gear structure provided by an embodiment of the utility model is shown in the figure;

[0062] Figure 9 The structure schematic view of the gear structure provided by an embodiment of the utility model is shown in the figure;

[0063] Figure 10 The structure schematic view of the gear structure provided by an embodiment of the utility model is shown in the figure;

[0064] Figure 11 The exploded view of the gear structure provided by an embodiment of the utility model is shown in the figure;

[0065] Figure 12 The structure schematic view of the driving device provided by an embodiment of the utility model is shown in the figure;

[0066] Figure 13 The structure schematic view of the moped provided by an embodiment of the utility model is shown in the figure.

[0067] Explanation of reference signs:

[0068] 100, moped;

[0069] 101, gear set; 102, driving device; 1021, driving part; 1022, output part; 1023, crank shaft; 103, chain wheel assembly; 104, wheel; 105, crank; 106, footrest assembly;

[0070] 10, gear structure;

[0071] 11, first gear; 111, first gear tooth;

[0072] 12, second gear; 121, second gear tooth;

[0073] 13, axial limiting mechanism; 131, clamping part; 132, matching part;

[0074] 14, elastic member; 151, first fixing member; 152, second fixing member; 161, accommodating space; 162, first limiting groove; 163, second limiting groove;

[0075] 17, first limiting member; 171, force applying sub; 172, limiting sub; 18, second limiting member; 181, screw rod; 182, nut;

[0076] 20, transmission gear; 21, gear slot; 211, slot surface. DETAILED DESCRIPTION

[0077] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application.

[0078] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "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 limited by "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0079] It should also be understood that the terms used in the specification of the utility model are only for the purpose of describing specific embodiments and are not intended to limit the utility model. As used in the specification of the utility model and the appended claims, unless otherwise clear from context, the singular forms "a," "an," and "the" are intended to include the plural forms as well. In the utility model, "at least one" means one or more, and "multiple" means two or more. The term "and / or", which describes the relationship between the associated objects, means that there can be three kinds of relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone, where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects. "At least one of the following" or similar expressions means any combination of these items, including any combination of single or multiple items. For example, at least one of a, b, or c can mean a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, and c can be single or multiple.

[0080] Some embodiments of the utility model will be described in detail below with reference to the accompanying drawings. In the case of no conflict, the following examples and features in the examples can be combined with each other.

[0081] When the gears are engaged, the tight fit between the teeth and the tooth grooves can effectively transmit power. However, in related technologies, transmission gaps often exist between the teeth and the tooth grooves. On the one hand, this can cause impact between the teeth and the tooth grooves, resulting in impact noise and wear phenomena. On the other hand, it can also affect the accuracy and efficiency of transmission. For example, in the field of electric-assisted vehicles, electric-assisted vehicles usually have a driving device that provides electric assistance when the user pedals, thus maintaining the fun of riding and reducing the physical exertion of the rider. However, in related technologies, due to the existence of transmission gaps, for example, when the driving device is empty and the electric-assisted vehicle is running on an uneven running surface, the two meshing gears in the driving device are prone to produce impact noise (such as the sound of "tata" ) and other problems, and are prone to virtual position idling problems, resulting in a decrease in transmission accuracy and a poor user experience.

[0082] Therefore, with reference to Figures 1 to 3 The utility model embodiment provides a gear structure 10, including first gear 11 and second gear 12, first gear 11 with second gear 12 coaxial arrangement. Wherein, when gear structure 10 is configured to mesh with transmission gear 20, second gear 12 can rotate in its circumferential direction to form a first tooth angle between first gear 11, so that the first tooth 111 of first gear 11 and the second tooth 121 of second gear 12 respectively contact the opposite sides of the same tooth groove 21 of transmission gear 20, and the first tooth angle is greater than zero.

[0083] The gear structure 10 of the above embodiment, on the one hand, the first gear 11 and the second gear 12 are relatively staggered to form a first staggered angle, so that the first tooth 111 of the first gear 11 and the second tooth 121 of the second gear 12 are respectively in contact with the opposite sides of the same tooth groove 21 of the transmission gear 20, achieving the effect of eliminating the transmission gap, thereby reducing or eliminating the impact noise caused by the existence of the transmission gap, and improving the user's experience.

[0084] In some embodiments, the material density of the first gear 11 is greater than the material density of the second gear 12, so that the weight of the first gear 11 is greater than the weight of the second gear 12. In this way, the second gear 12 with smaller weight rotates in the circumferential direction, so that the first gear 11 and the second gear 12 form a staggered angle. In response to different working conditions, the rotational inertia of the second gear is smaller, the gap elimination response is more timely and flexible, the impact noise when the second gear cooperates with the transmission gear is small, and it is beneficial to reduce the overall weight of the gear structure 10. When worn, the maintenance cost is also lower.

[0085] For this purpose, please refer to Figures 1 to 3 The utility model embodiment provides a gear structure 10, including first gear 11 and second gear 12, first gear 11 with second gear 12 coaxial arrangement. Among them, when the gear structure 10 is configured to be engaged with transmission gear 20, first gear 11 and second gear 12 between there is first staggered angle, first gear 11 first tooth 111 and second gear 12 second tooth 121 respectively contact with the opposite sides of the same tooth groove 21 of transmission gear 20, when the gear structure 10 is not engaged with transmission gear 20, first gear 11 and second gear 12 between there is second staggered angle. First staggered angle is different from second staggered angle, first staggered angle and second staggered angle all greater than zero.

[0086] The gear structure 10 of the above embodiment, on the one hand, the first gear 11 and the second gear 12 are relatively staggered and have a first staggered angle, the first teeth 111 of the first gear 11 and the second teeth 121 of the second gear 12 respectively contact the opposite sides of the same tooth groove 21 of the transmission gear 20, achieving the effect of eliminating the transmission gap, thereby reducing or eliminating the impact noise caused by the existence of the transmission gap and improving the user experience. On the other hand, when the gear structure 10 is not engaged with the transmission gear 20, the first gear 11 and the second gear 12 have a second staggered angle, the first staggered angle is different from the second staggered angle, and the second staggered angle is greater than zero. In this way, it can be ensured that when the gear structure 10 is engaged with the transmission gear 20, the first gear 11 and the first teeth 111 and the second gear 12 and the second teeth 121 can reliably contact the opposite sides of the same tooth groove 21 of the transmission gear 20, respectively, to effectively eliminate the transmission gap and as much as possible to reduce the problem of impact noise caused by the existence of the transmission gap.

[0087] It can be understood that the relative stagger of the first gear 11 and the second gear 12 means that the first teeth 111 of the first gear 11 and the second teeth 121 of the second gear 12 are not aligned in the axial direction and are relatively staggered by a certain angle. The first staggered angle between the first gear 11 and the second gear 12 means that the first teeth 111 of the first gear 11 and the second teeth 121 of the second gear 12 are not aligned in the axial direction and are relatively staggered by a certain angle.

[0088] In some embodiments, the first gear 11 is made of a metal material to ensure that the gear structure 10 has good performance, such as good rigidity, strength, and / or durability, etc.

[0089] In some embodiments, the second gear 12 is made of a non-metal material, so that in the case of eliminating the transmission gap, the cost can be reduced, the weight can be reduced, and the assembly can be facilitated. In addition, the second gear 12 made of a non-metal material can reduce the transmission of vibration to some extent, has a certain effect of vibration absorption and noise reduction, reduces the probability of resonance, and makes the engagement and transmission of the gear structure 10 and the transmission gear 20 more stable. For example, the second gear 12 is made of a plastic material. For example, the second gear 12 is made of a composite material.

[0090] In some embodiments, the second gear 12 is made of a metal material. For example, the second gear 12 is made of an alloy material. For example, the second gear 12 is made of a porous metal material.

[0091] In some embodiments, the first gear 11 and the second gear 12 have at least one of the following parameters in common: diameter, modulus, number of teeth, tooth width, pressure angle, etc.

[0092] In some embodiments, the axial corresponding thickness of the second gear 12 is less than the axial corresponding thickness of the first gear 11. In this way, the weight of the second gear 12 is reduced, the response speed of the second gear 12 rotating along its circumference to eliminate backlash is improved, the transmission backlash response is more timely and flexible when dealing with different working conditions, the overall weight of the gear structure 10 is reduced, the contact noise between the second gear 12 and the transmission gear 20 is smaller, and the maintenance cost of the second gear 12 when it is worn is also lower.

[0093] In some embodiments, the sum of the axial thicknesses of the first gear 11 and the second gear 12 is less than or equal to the axial thickness of the gear slot of the transmission gear 20. In this way, it is ensured that the first gear teeth 111 and the second gear teeth 121 can respectively contact the opposite sides of the same gear slot 21 of the transmission gear 20, without exceeding the axial thickness of the gear slot 21, avoiding the first gear teeth 111 and / or the second gear teeth 121 from disengaging from the gear slot 21 and failing to form meshing action.

[0094] In some embodiments, the rigidity of the second gear 12 is less than the rigidity of the first gear 11. In this way, the first gear 11 can ensure the strength and durability of the gear structure 10, and the second gear 12 with smaller rigidity can reduce the transmission of vibration to a certain extent, achieving a certain effect of vibration absorption and noise reduction, reducing the probability of resonance, and making the meshing transmission of the gear structure 10 and the transmission gear 20 more stable.

[0095] In some embodiments, when the gear structure 10 is not meshed with the transmission gear 20, the first gear 11 and the second gear 12 have a second tooth misalignment angle; the first tooth misalignment angle is different from the second tooth misalignment angle. In this way, the gear structure 10 and the transmission gear 20 are conveniently and quickly assembled; after the gear structure 10 is meshed with the transmission gear 20, the first gear teeth 111 of the first gear 11 and the second gear teeth 121 of the second gear 12 can respectively quickly contact the opposite sides of the same gear slot 21 of the transmission gear 20, to eliminate the transmission gap between the transmission gear 20 and the first gear 11.

[0096] In some embodiments, the first tooth misalignment angle is less than the second tooth misalignment angle.

[0097] In some embodiments, the second tooth misalignment angle is greater than zero. In this way, when the gear structure 10 is not meshed with the transmission gear 20, no additional limiting measures are needed to align the first gear 11 and the second gear 12 together.

[0098] In some embodiments, the first tooth staggering angle is greater than zero and less than or equal to an angle corresponding to a tooth gap formed between the transmission gear 20 and the first gear 11, so that the first gear teeth 111 of the first gear 11 and the second gear teeth 121 of the second gear 12 can respectively contact opposite sides of the same tooth groove 21 of the transmission gear 20 to achieve the effect of eliminating the transmission gap.

[0099] In some embodiments, the first tooth staggering angle can be adjusted within a certain angle range during the process of maintaining the meshing transmission between the gear structure 10 and the transmission gear 20. In this way, in the moped scenario, even when the moped needs to cope with different bumpy road conditions during the process of maintaining the meshing transmission between the gear structure 10 and the transmission gear 20, since the first tooth staggering angle can be adjusted within a certain angle range, it can be ensured that the first gear teeth 111 of the first gear 11 and the second gear teeth 121 of the second gear 12 can always reliably and tightly contact opposite sides of the same tooth groove 21 of the transmission gear 20, achieving the effect of dynamically eliminating the transmission gap, and ensuring that the gear structure 10 and the transmission gear 20 can reliably mesh and transmit, improving the adaptability of the gear structure 10 to complex environments and prolonging the maintenance period of the gear structure 10.

[0100] Please refer to Figure 3 In some embodiments, the same tooth groove 21 of the transmission gear 20 includes two oppositely arranged groove surfaces 211; during the process of maintaining the meshing transmission between the gear structure 10 and the transmission gear 20, the first gear teeth 111 of the first gear 11 and the second gear teeth 121 of the second gear 12 respectively contact the two oppositely arranged groove surfaces 211 of the same tooth groove 21, thereby achieving the effect of eliminating the transmission gap, reducing or eliminating the problem of impact noise due to the existence of the transmission gap, and improving the user's experience.

[0101] Please refer to Figure 4 In some embodiments, the gear structure 10 further includes an axial limiting mechanism 13, and the first gear 11 and the second gear 12 can be relatively limited in the axial direction under the action of the axial limiting mechanism 13 to prevent the first gear 11 and the second gear 12 from separating along the axial direction, thereby providing a guarantee for the relative tooth staggering between the first gear 11 and the second gear 12 to achieve the effect of eliminating the transmission gap. For example, under the action of the axial limiting mechanism 13, the first gear 11 and the second gear 12 can be limited to move along the axial direction of the second gear 12 within the height range of the gear teeth of the first gear 11. The height of the gear teeth of the first gear 11 is parallel to the axial direction of the second gear 12.

[0102] In some embodiments, the axial limiting mechanism 13 is limited in a clamping manner, so that the axial stability between the first gear 11 and the second gear 12 can be ensured when the transmission gap is eliminated, and axial displacement can be avoided to cause the transmission gap to be ineffective. Figure 4 In some embodiments, the axial limiting mechanism 13 includes a clamping portion 131 and a matching portion 132, the clamping portion 131 is arranged on one of the first gear 11 and the second gear 12, the matching portion 132 is arranged on the other one of the first gear 11 and the second gear 12, and the clamping portion 131 and the matching portion 132 are matched to form a clamping limit. In this way, the first gear 11 and the second gear 12 can be axially limited by clamping to limit the axial movement between the first gear 11 and the second gear 12, and the first gear 11 and the second gear 12 are convenient, easy and fast to disassemble and assemble.

[0103] For example, the clamping portion 131 is arranged on the first gear 11, and the matching portion 132 is arranged on the second gear 12. For example, the matching portion 132 is arranged on the first gear 11, and the clamping portion 131 is arranged on the second gear 12. For example, the clamping portion 131 can include a clamping protrusion, a clamping buckle or a clamping hook, and the matching portion 132 includes a clamping groove. Taking the case that the matching portion 132 is arranged on the first gear 11 and the clamping portion 131 is arranged on the second gear 12 as an example for description; the matching portion 132 can be integrally formed with the first gear 11 or can be separately arranged; and the clamping portion 131 can be integrally formed with the second gear 12 or can be separately arranged.

[0104] For example, the clamping portion 131 is arranged on the first gear 11, and the matching portion 132 is arranged on the second gear 12. For example, the matching portion 132 is arranged on the first gear 11, and the clamping portion 131 is arranged on the second gear 12. For example, the clamping portion 131 can include a clamping protrusion, a clamping buckle or a clamping hook, and the matching portion 132 includes a clamping groove. Taking the case that the matching portion 132 is arranged on the first gear 11 and the clamping portion 131 is arranged on the second gear 12 as an example for description; the matching portion 132 can be integrally formed with the first gear 11 or can be separately arranged; and the clamping portion 131 can be integrally formed with the second gear 12 or can be separately arranged. Figure 4 and Figure 5 In some embodiments, the gear structure 10 further includes an elastic member 14, and the second gear 12 can rotate along the circumference under the action of the elastic restoring force of the elastic member 14 to form a first tooth angle. By relatively toothing the first gear 11 and the second gear 12 through the elastic member 14, the transmission gap can be automatically eliminated to reduce the impact noise.

[0105] In some embodiments, the elastic member 14 utilizes its elastic deformation to exert a circumferential rotation restoring force on the second gear 12. The elastic restoring force of the elastic member 14 can automatically compensate for the wear of the gear meshing surface, improve the gap elimination reliability, and in addition, the elastic deformation of the elastic member 14 can also serve as a buffer impact. When starting, stopping or reversing, the elastic deformation of the elastic member 14 can relieve the instantaneous impact, protect the gear teeth, reduce the probability of impact between the gears, and thus can reduce the probability of noise caused by the impact between the meshing gears to a certain extent. In addition, the elastic member 14 can also absorb vibration to a certain extent, and has a damping effect, and can reduce noise to a certain extent.

[0106] In some embodiments, the elastic member 14 is in an initial pre-tightening state when the gear structure 10 is not engaged with the transmission gear 20, and is in an energy storage state when the gear structure 10 is engaged with the transmission gear 20. Illustratively, when the gear structure 10 is engaged with the transmission gear 20, the elastic member 14 is in the energy storage state, and the elastic member 14 is elastically deformed, and the elastic member 14 can reliably cause the first gear 11 and the second gear 12 to be relatively misaligned, so that the first gear teeth 111 of the first gear 11 and the second gear teeth 121 of the second gear 12 can reliably contact the opposite sides of the same tooth groove 21 of the transmission gear 20, respectively, to effectively eliminate the transmission gap. Illustratively, the elastic deformation of the elastic member 14 in the energy storage state is greater than the elastic deformation of the elastic member 14 in the initial pre-tightening state.

[0107] In some embodiments, the elastic member 14 is in a compressed or stretched state when the gear structure 10 is engaged with the transmission gear 20, i.e., the elastic member 14 is compressed or stretched.

[0108] Illustratively, the elastic member 14 includes at least one of the following: a torsion spring, a spring, a rubber member, a metal elastic sheet, a shape memory alloy member, etc.

[0109] The number of elastic members 14 can be set according to actual needs. In some embodiments, the number of elastic members 14 includes one or more, such as one, two, three, four, five, six, seven, or more. Please refer to Figure 4 , illustratively, the number of elastic members 14 includes one, so that the gear structure 10 has a simple structure, and the number of components of the gear structure 10 is less, and the gear structure 10 is easy and fast to assemble. Please refer to Figure 6 and Figure 7 , illustratively, the number of elastic members 14 includes a plurality, and the plurality of elastic members 14 are arranged in a circumferential direction of the gear structure 10. The plurality of elastic members 14 can make the force on the gear more uniform, prevent the gear from deforming or being damaged due to excessive local force, and improve the reliability of the gear structure 10; in addition, the plurality of elastic members 14 can better cause the first gear teeth 111 of the first gear 11 and the second gear teeth 121 of the second gear 12 to contact the opposite sides of the same tooth groove 21 of the transmission gear 20, respectively, thereby effectively eliminating the transmission gap.

[0110] Please refer to Figure 4 and Figure 5 , in some embodiments, one end of the elastic member 14 is connected to the first gear 11, and the other end of the elastic member 14 is connected to the second gear 12, so that the elastic member 14 can be reliably connected between the first gear 11 and the second gear 12, and can achieve relative misalignment between the first gear 11 and the second gear 12 to eliminate the transmission gap.

[0111] Please refer toFigure 4 In some embodiments, the gear structure 10 further comprises a first fixing member 151, one end of the elastic member 14 is connected with the first gear 11 through the first fixing member 151. In this way, the connection between the elastic member 14 and the first gear 11 is simple and reliable. Exemplarily, the first fixing member 151 comprises at least one of the following: a pin body, a screw structure, etc. The pin body comprises at least one of the following: a cylindrical pin, a conical pin, a pin shaft, etc.

[0112] Referring to Figure 4 In some embodiments, the gear structure 10 further comprises a second fixing member 152, the other end of the elastic member 14 is connected with the second gear 12 through the second fixing member 152. In this way, the connection between the elastic member 14 and the second gear 12 is simple and reliable. Exemplarily, the second fixing member 152 comprises at least one of the following: a pin body, a screw structure, etc. The pin body comprises at least one of the following: a cylindrical pin, a conical pin, a pin shaft, etc. It can be understood that, in other embodiments, the first fixing member 151 and / or the second fixing member 152 can also be omitted, and the elastic member 14 can be connected to the corresponding gear through at least one of the following ways: gluing, hooking, etc.

[0113] Referring to Figure 4 In some embodiments, the gear structure 10 comprises the first fixing member 151 and the second fixing member 152, one end of the elastic member 14 is connected with the first gear 11 through the first fixing member 151, and the other end of the elastic member 14 is connected with the second gear 12 through the second fixing member 152; the distance between the first fixing member 151 and the second fixing member 152 changes with the degree of elastic deformation of the elastic member 14. Exemplarily, when the second gear 12 can rotate in the circumferential direction thereof to form a first staggered angle with the first gear 11, the first fixing member 151 is relatively fixed with the first gear 11, the second fixing member 152 is relatively fixed with the second gear 12, and the second fixing member 152 and the second gear 12 can rotate synchronously along the circumferential direction of the second gear 12 relative to the first fixing member 151 and the first gear 11. The distance between the first fixing member 151 and the second fixing member 152 along the circumferential direction of the second gear 12 changes with the degree of elastic deformation of the elastic member 14.

[0114] Referring to Figure 4 and Figure 5In some embodiments, the first gear 11 and the second gear 12 enclose a receiving space 161. The receiving space 161 is configured to reduce the weight of the gear structure 10. In addition, the receiving space 161 can be used to accommodate other components of the gear structure 10, such as at least one of the following: at least part of the elastic member 14, at least part of the first fixing member 151, at least part of the second fixing member 152, at least part of the first limiting member 17, etc., so that the structure of the gear structure 10 is more compact. The shape of the receiving space 161 can be any suitable shape, such as annular or non-annular. In some embodiments, the receiving space 161 is annularly distributed, so that the weight of the gear structure 10 can be reduced as much as possible, and the elastic member 14 can be arranged more flexibly.

[0115] Referring to Figure 4 and Figure 5 In some embodiments, the first fixing member 151, the second fixing member 152, and / or the elastic member 14 are arranged in the receiving space 161, so that the occupied space of the gear structure 10 can be reduced, and the structure of the gear structure 10 is more compact.

[0116] Referring to Figure 6 and Figure 7 In some embodiments, the gear structure 10 further comprises a first limiting member 17, the first limiting member 17 is arranged on one of the first gear 11 and the second gear 12, the elastic member 14 is arranged on the other one of the first gear 11 and the second gear 12, and the first limiting member 17 cooperates with the elastic member 14. The first limiting member 17 can limit the elastic member 14 in the axial direction of the second gear 12, so as to ensure that the elastic member 14 can realize the relative tooth misalignment between the first gear 11 and the second gear 12.

[0117] In some embodiments, the first limiting member 17 is integrally formed with the first gear 11 or is separately arranged; or the first limiting member 17 is integrally formed with the second gear 12 or is separately arranged. For example, the first limiting member 17 is integrally formed with the first gear 11; or the first limiting member 17 is integrally formed with the second gear 12, so that the number of components of the gear structure 10 is small, and the gear structure 10 is easy and fast to assemble.

[0118] Referring to Figure 6 and Figure 7In some embodiments, the first limiting member 17 is arranged on one of the first gear 11 and the second gear 12, and the other of the first gear 11 and the second gear 12 is provided with the first limiting groove 162, and the elastic member 14 is arranged in the first limiting groove 162; when the first limiting member 17 and the elastic member 14 are in the cooperating state, the first limiting member 17 can press the elastic member 14 in the first limiting groove 162, thereby limiting and applying force to the elastic member 14, so that the second gear 12 can rotate along the circumference of the second gear 12 under the action of the restoring force of the elastic member 14, thereby forming the first tooth misalignment angle between the first gear 11 and the second gear 12. For example, the first limiting member 17 is arranged on the first gear 11, and the second gear 12 is provided with the first limiting groove 162. Please refer to Figure 6 For example, the first limiting member 17 is arranged on the second gear 12, and the first gear 11 is provided with the first limiting groove 162.

[0119] Please refer to Figure 7 and Figure 8 In some embodiments, the first limiting member 17 includes a force applying sub-portion 171 and a limiting sub-portion 172, the force applying sub-portion 171 is at least partially arranged in the first limiting groove 162, and the force applying sub-portion 171 is used to apply a circumferential force to the elastic member 14 to cause the elastic member 14 to elastically deform, so that the second gear 12 can rotate along the circumference of the second gear 12 under the action of the restoring force of the elastic member 14 to form the first tooth misalignment angle. The limiting sub-portion 172 is connected with the force applying sub-portion 171, and the limiting sub-portion 172 is used to axially limit the elastic member 14. For example, the limiting sub-portion 172 is connected with one of the first gear 11 and the second gear 12, such as the limiting sub-portion 172 is connected with the second gear 12; when the first limiting member 17 and the elastic member 14 are in the cooperating state, the limiting sub-portion 172 can press the elastic member 14 in the first limiting groove 162, thereby axially limiting the elastic member 14.

[0120] Please refer to Figure 7 In some embodiments, the force applying sub-portion 171 and the limiting sub-portion 172 cooperatively form a stepped structure or an L-shaped structure, so that the structure of the first limiting member 17 is simple. In other embodiments, the force applying sub-portion 171 and the limiting sub-portion 172 cooperatively form other shaped structures, such as a T-shaped structure.

[0121] Please refer to Figure 7In some embodiments, the force applying sub-portion 171 is in contact with the side surface of the elastic member 14, so that the force applying sub-portion 171 can apply a circumferential force to the elastic member 14, so that the elastic member 14 is elastically deformed, and then the second gear 12 is rotated along the circumferential direction of the second gear 12 under the restoring force of the elastic member 14 to form the first tooth angle with the first gear 11. In some embodiments, the limiting sub-portion 172 is in contact with the top surface of the elastic member 14, so that the limiting sub-portion 172 can limit the axial direction of the elastic member 14 when the first limiting member 17 is in cooperation with the elastic member 14.

[0122] Referring to Figure 9 In some embodiments, the gear structure 10 further comprises a second limiting member 18 which cooperates with the elastic member 14. The second limiting member 18 can limit the axial direction of the elastic member 14, so that the relative tooth angle between the first gear 11 and the second gear 12 can be realized.

[0123] Referring to Figure 9 and Figure 10 In some embodiments, the second limiting member 18 is arranged through the second gear 12, the elastic member 14 and the first gear 11 to realize the connection between the first gear 11 and the second gear 12. On the one hand, the second limiting member 18 can limit the axial direction of the second gear 12, the elastic member 14 and the first gear 11; on the other hand, the second limiting member 18 can apply a circumferential force to the elastic member 14, so that the elastic member 14 is elastically deformed, and then the second gear 12 is rotated along the circumferential direction of the second gear 12 under the restoring force of the elastic member 14 to form the first tooth angle. Thus, the second limiting member 18 can limit the axial direction and apply a circumferential force to the elastic member 14, without separately arranging two structures, so that the structure of the gear structure 10 is simplified.

[0124] In some embodiments, the first gear 11 and the second gear 12 are limited in the axial direction, and the second gear 12 can rotate relative to the first gear 11 in the circumferential direction. Thus, the relative tooth angle between the first gear 11 and the second gear 12 can be realized.

[0125] It can be understood that, unless otherwise specified, the axial direction in the embodiments of the present application refers to the axial direction of the second gear 12 or the gear structure 10. The circumferential direction in the embodiments of the present application refers to the circumferential direction of the second gear 12 or the gear structure 10.

[0126] In some embodiments, a gap exists between the limiting surface of the second limiting member 18 and the second gear 12, which is beneficial to ensure that the second gear 12 can rotate more smoothly relative to the first gear 11, so as to ensure that the second gear 12 and the first gear 11 can relatively stagger more smoothly and flexibly to eliminate the transmission gap.

[0127] In some embodiments, the axial dimension of the second limiting member 18 is greater than the axial dimension of the part of the gear structure 10 other than the second limiting member 18. In other embodiments, the axial dimension of the second limiting member 18 can also be less than or equal to the axial dimension of the part of the gear structure 10 other than the second limiting member 18.

[0128] Please refer to Figure 11 In some embodiments, the first gear 11 or the second gear 12 is provided with a second limiting groove 163, and the elastic member 14 is at least partially arranged in the second limiting groove 163. The second limiting groove 163 can axially limit the bottom surface of the elastic member 14 and can limit the elastic member 14 in the circumferential direction.

[0129] Please refer to Figure 10 and Figure 11 In some embodiments, the second limiting member 18 includes a screw rod 181 and a nut 182, and the structure of the second limiting member 18 is simple and practical. While achieving transmission gap elimination, it can also provide axial limiting.

[0130] Exemplarily, the last stage gear of the driving device 102 of the moped 100 is provided as the gear structure 10, which includes the first gear 11 and the second gear 12, and the two gears have a preset deviation when assembled. The deviation compensates for the gap between the first gear 11 and the transmission gear 20 engaged with the first gear 11, thereby reducing or eliminating the impact noise caused by the transmission gap.

[0131] In some embodiments, the edge of the second gear 12 is provided with a buckle for buckling on the first gear 11, and the elastic member 14 is arranged in the inner ring of the gear. The elastic member 14 abuts against the first gear 11 and the second gear 12, and the first gear 11 and the second gear 12 are relatively staggered by the elastic force of the elastic member 14.

[0132] Exemplarily, the first fixing member 151 is fixed with the first gear 11, and the second fixing member 152 is fixed with the second gear 12. In the initial state, the first gear 11 and the second gear 12 are misaligned, that is, the two gears are relatively misaligned, and the elastic member 14 provides a pre-tightening force. When the gear structure 10 is switched from a state of not being engaged with the transmission gear 20 to a state of being engaged with the transmission gear 20, the second gear 12 can rotate relative to the first gear 11, so that the misalignment angle between the first gear 11 and the second gear 12 is reduced; the second gear 12 drives the elastic member 14 to further deform through the second fixing member 152, until the teeth of the first gear 11 and the teeth of the second gear 12 respectively contact the opposite sides of the same tooth groove 21 of the transmission gear 20, so as to realize the function of eliminating the transmission gap.

[0133] In the related art, the gears engaged in transmission are prone to impact noise and other problems due to the existence of transmission gap, resulting in poor user experience. Although there are some ways to eliminate the gap, the assembly and disassembly of the gears are not convenient enough.

[0134] Therefore, referring to Figures 1 to 4 The utility model discloses a gear structure 10, including first gear 11 and second gear 12, first gear 11 with second gear 12 coaxial arrangement, one of first gear 11 and second gear 12 is equipped with the clamping part 131, and the other of first gear 11 and second gear 12 is equipped with the matching part 132, and the clamping part 131 is clamped with the matching part 132, to limit the axial relative movement between first gear 11 and second gear 12. Among them, the gear structure 10 is configured to be engaged with the transmission gear 20, and the first gear 11 and the second gear 12 have a first misalignment angle therebetween, so that the first gear teeth 111 of the first gear 11 and the second gear teeth 121 of the second gear 12 respectively contact the opposite sides of the same tooth groove 21 of the transmission gear 20.

[0135] The gear structure 10 of the above embodiment, on the one hand, the first gear 11 and the second gear 12 are relatively misaligned to form a first misalignment angle, so that the first gear teeth 111 of the first gear 11 and the second gear teeth 121 of the second gear 12 respectively contact the opposite sides of the same tooth groove 21 of the transmission gear 20, realizing the function of eliminating the transmission gap, thereby reducing or eliminating the impact noise caused by the existence of the transmission gap and improving the user experience. On the other hand, the two gears are axially limited by clamping to limit the axial movement between the first gear 11 and the second gear 12, and the first gear 11 and the second gear 12 are convenient, easy and fast to disassemble and assemble, and on the other hand, the axial stability between the first gear 11 and the second gear 12 can be ensured when the transmission gap is eliminated, avoiding the transmission gap elimination failure caused by axial displacement.

[0136] It should be noted that, in the case of no conflict, the parts not mentioned in the embodiments of the utility model can be referred to the foregoing Figures 1-11 The related description of the embodiments shown in the foregoing is not repeated here.

[0137] Please refer to Figure 1 and Figure 3 The utility model embodiment provides a gear set 101, including the gear structure 10 and the transmission gear 20 of any one embodiment above, the transmission gear 20 is connected with the gear structure 10 transmission.

[0138] Exemplarily, the transmission gear 20 includes the transmission gear 20 of any one embodiment above.

[0139] In some embodiments, the diameter of the first gear 11 and / or the second gear 12 is greater than the diameter of the transmission gear 20. In this way, the torque output can be increased by reducing the speed transmission, so that the moped 100 obtains greater driving force when running at low speed. In addition, the first gear 11 and / or the second gear 12 with larger diameter can increase the number of meshing teeth, thereby reducing the impact and vibration in the gear transmission, improving the stability and reliability of the transmission; increasing the number of meshing teeth is also conducive to reducing the noise in the gear transmission process.

[0140] In some embodiments, the material density of the transmission gear 20 is greater than the material density of the second gear 12, and / or the material density of the transmission gear 20 is equal to the material density of the first gear 11. Exemplarily, the material density of the transmission gear 20 is greater than the material density of the second gear 12, so that the weight of the transmission gear 20 is greater than the weight of the second gear 12; and / or the material density of the transmission gear 20 is equal to the material density of the first gear 11, so that the weight of the transmission gear 20 is equal to the weight of the first gear 11, and the second gear 12 with smaller weight rotates in the circumferential direction, so that the first gear 11 and the second gear 12 form a staggered tooth angle, the second gear 12 has smaller rotational inertia, the transmission gap response is more timely and flexible when responding to different working conditions, the overall weight is also lighter, the impact noise of the second gear 12 contacting the transmission gear 20 is also smaller, and the maintenance cost of the second gear 12 when being worn is also lower.

[0141] In some embodiments, the rigidity of the transmission gear 20 is greater than the rigidity of the second gear 12, and / or the rigidity of the transmission gear 20 is equal to the rigidity of the first gear 11. In this way, the first gear 11 and the transmission gear 20 can ensure the reliability of the gear transmission, the second gear 12 with smaller rigidity can reduce the transmission of vibration to a certain extent, play a certain effect of vibration absorption and noise reduction, reduce the probability of resonance, and make the meshing transmission of the gear structure 10 and the transmission gear 20 more stable.

[0142] Please refer to Figure 1 andFigure 12 The utility model embodiment provides a drive device 102, including drive part 1021, gear structure 10 and output part 1022, gear structure 10 includes the gear structure 10 of any one embodiment above. Among them, the input end of gear structure 10 is connected with drive part 1021 through transmission gear 20, and the output end of gear structure 10 is connected with output part 1022.

[0143] Exemplarily, drive part 1021 includes drive motor.

[0144] Please refer to Figure 12 , in combination Figure 13 Exemplarily, output part 1022 is connected with the output end of gear structure 10, and output part 1022 is used to be connected with sprocket assembly 103 (please refer to Figure 13 ) of power-assisted vehicle 100 in transmission. Exemplarily, output part 1022 can be coaxially arranged with first gear 11, or output part 1022 is coaxially arranged with second gear 12.

[0145] Exemplarily, drive device 102 includes at least one of motor, other motion device and the like. For example, drive device 102 includes the middle motor of power-assisted vehicle 100.

[0146] Please refer to Figure 13 The utility model embodiment further provides a power-assisted vehicle 100, including wheel device and the drive device 102 of any one embodiment above, and drive device 102 is connected with wheel device in transmission, is used to provide electric power to wheel device.

[0147] Exemplarily, power-assisted vehicle 100 can include electric power-assisted bicycle and the like. In the case where rider pedals, drive device 102 of power-assisted vehicle 100 can provide electric power to help power-assisted vehicle 100 including drive device 102 to travel forward, reduce the physical consumption of rider in keeping the riding fun.

[0148] Exemplarily, wheel device includes wheel 104 and sprocket assembly 103, and output part 1022 can be connected to wheel 104 through sprocket assembly 103 to transmit the power provided by drive part 1021 to wheel 104, thereby providing power assistance.

[0149] Please refer to Figure 12 And Figure 13The driving device 102 further comprises a crank shaft 1023 which is drivingly connected with the output portion 1022, and the crank shaft 1023 is used to be drivingly connected with a crank 105 of the moped 100. The output portion 1022 is drivingly connected with the crank 105 of the moped 100 through the crank shaft 1023, and the crank 105 is connected with a pedal assembly 106. A rider can drive the moped 100 to move by stepping the pedal assembly 106 to rotate the crank shaft 1023, and then to exert the stepping force on the output portion 1022. The crank shaft 1023 is arranged to pass through the output portion 1022.

[0150] In the description of the utility model, it is necessary to explain that, unless another explicit stipulation and limitation, the term "installation", "link", "connection", "mechanical coupling", "coupling" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected. Can be mechanical connection, also can be electrical connection. Can be directly connected, also can be indirectly connected through the intermediate medium, can be the communication of two elements or the interaction relationship of two elements. The mechanical coupling or coupling of two components includes direct coupling and indirect coupling, for example, direct fixed connection, connection through transmission mechanism, etc. The mechanical coupling of two components can be understood as the existence of mechanical connection and / or mechanical interaction between two components. Mechanical connection includes but is not limited to at least one of the following: rotary connection, movable connection, sliding connection and abutment, etc. For ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific situation.

[0151] In the utility model, unless another explicit stipulation and limitation, the first feature is "on" or "under" the second feature can include that the first and second features are in direct contact, also can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "on the" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature "under", "below" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0152] The above disclosure provides many different implementations or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described above. Of course, they are only examples and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to numbers and / or letters in different examples, and such repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0153] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" means that the specific method steps, features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific method steps, features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0154] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A gear structure characterized by comprising: The gear structure comprises: a first gear; a second gear coaxially arranged with the first gear, the first gear having a material density greater than that of the second gear, so that the weight of the first gear is greater than that of the second gear; wherein, when the gear structure is configured to mesh with a transmission gear, the second gear is capable of rotating in its circumferential direction to form a first tooth-misalignment angle with the first gear, so that first teeth of the first gear and second teeth of the second gear respectively contact opposite sides of a same tooth groove of the transmission gear, the first tooth-misalignment angle being greater than zero.

2. The gear structure according to claim 1, characterized by The gear structure further comprises an axial limiting mechanism, the first gear and the second gear being limited in relative position in the axial direction under the action of the axial limiting mechanism.

3. The gear structure according to claim 2, characterized by The axial limiting mechanism limits in a clamping manner.

4. The gear structure according to claim 3, characterized by The axial limiting mechanism comprises a clamping portion and a matching portion, the clamping portion being arranged on one of the first gear and the second gear, and the matching portion being arranged on the other one of the first gear and the second gear, the clamping portion and the matching portion being matched to form clamping limiting.

5. A gear structure characterized by comprising: The gear structure comprises: a first gear; and a second gear coaxially arranged with the first gear, one of the first gear and the second gear being provided with a clamping portion, and the other one being provided with a matching portion, the clamping portion and the matching portion being clamped and matched to limit the axial relative movement between the first gear and the second gear; wherein, when the gear structure is configured to mesh with a transmission gear, the first gear and the second gear have a first tooth-misalignment angle therebetween, so that first teeth of the first gear and second teeth of the second gear respectively contact opposite sides of a same tooth groove of the transmission gear.

6. The gear structure according to claim 5, characterized by The material density of the first gear is greater than that of the second gear, so that the weight of the first gear is greater than that of the second gear.

7. The gear structure according to any one of claims 1 to 4, 6, wherein The first gear is made of a metal material; or, The second gear is made of a non-metal material; or, The second gear is made of a plastic material; or, The second gear is made of a composite material; or, The second gear is made of a metal material; or, The second gear is made of an alloy material; or, The second gear is made of a porous metal material.

8. The gear structure according to any one of claims 1 to 6, characterized by At least one of the following parameters of the first gear and the second gear is the same: diameter, modulus, number of teeth, tooth width, pressure angle; and / or, The corresponding thickness of the second gear in the axial direction is less than that of the first gear in the axial direction; and / or, The rigidity of the second gear is less than that of the first gear.

9. The gear structure according to any one of claims 1 to 6, characterized by When the gear structure is not meshed with the transmission gear, the first gear and the second gear have a second tooth-misalignment angle therebetween; the first tooth-misalignment angle is different from the second tooth-misalignment angle; and / or, The first tooth-misalignment angle is greater than zero and less than or equal to the angle corresponding to the backlash formed between the transmission gear and the first gear.

10. The gear structure according to claim 9, characterized by The first tooth-misalignment angle is less than the second tooth-misalignment angle; and / or, The second tooth-misalignment angle is greater than zero.

11. The gear structure according to any one of claims 1 to 6, characterized by The first tooth angle can be adjusted within a certain angle range during the engagement of the gear structure and the transmission gear.

12. The gear structure according to claim 11, characterized by The same tooth groove of the transmission gear comprises two oppositely arranged groove surfaces; during the engagement of the gear structure and the transmission gear, the first tooth of the first gear and the second tooth of the second gear respectively contact the two oppositely arranged groove surfaces of the same tooth groove.

13. The gear structure according to any one of claims 1 to 6, characterized by The gear structure further comprises an elastic member, and the second gear can rotate in the circumferential direction under the restoring force of the elastic member to form the first tooth angle.

14. The gear structure according to claim 13, characterized by The elastic member uses its elastic deformation to exert the circumferential rotating restoring force on the second gear.

15. The gear structure according to claim 14, characterized by When the gear structure is not engaged with the transmission gear, the elastic member is in an initial pre-tightening state; when the gear structure is engaged with the transmission gear, the elastic member is in an energy storage state; and / or, When the gear structure is engaged with the transmission gear, the elastic member is in a compressed or stretched state.

16. The gear structure according to claim 13, characterized by The elastic member comprises at least one of the following: a torsion spring, a spring, a rubber member, a metal spring piece, and a shape memory alloy piece. And / or, One end of the elastic member is connected to the first gear, and the other end is connected to the second gear; and / or, The first gear and the second gear form an accommodation space therebetween.

17. The gear structure according to claim 13, characterized by The gear structure further comprises a first limiting member, the first limiting member is arranged on one of the first gear and the second gear, the elastic member is arranged on the other one of the first gear and the second gear, and the first limiting member cooperates with the elastic member.

18. A gear set, characterized by Comprise: The gear structure according to any one of claims 1-17; and The transmission gear, which is in transmission connection with the gear structure.

19. The gear kit of claim 18, wherein, The diameter of the first gear and / or the second gear is greater than the diameter of the transmission gear; and / or, The material density of the transmission gear is greater than the material density of the second gear, and / or the material density of the transmission gear is equal to the material density of the first gear; and / or, the rigidity of the transmission gear is greater than the rigidity of the second gear, and / or the rigidity of the transmission gear is equal to the rigidity of the first gear.

20. A moped, characterized in that Comprise: A wheel device; A driving part; The gear structure according to any one of claims 1-17; The input end of the gear structure is in transmission connection with the driving part through the transmission gear, and the output end of the gear structure is in transmission connection with the wheel device, for providing electric assistance to the wheel device.

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