CN219452805U - Multistage transmission structure and power device with same - Google Patents
Multistage transmission structure and power device with same Download PDFInfo
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- CN219452805U CN219452805U CN202320504069.2U CN202320504069U CN219452805U CN 219452805 U CN219452805 U CN 219452805U CN 202320504069 U CN202320504069 U CN 202320504069U CN 219452805 U CN219452805 U CN 219452805U
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Abstract
The application provides a multistage transmission structure, a plurality of gear sets, wherein: the gear sets comprise an input gear set, an output gear set and an intermediate gear set arranged between the input gear set and the output gear set, and each gear set comprises a gear shaft and at least one gear arranged on the gear shaft; the gear set comprises two gears which are coaxial in the axial direction of the gear shaft and are arranged at intervals, wherein a nonmetallic baffle is arranged on the gear shaft and positioned between the two gears. The utility model provides a multistage transmission structure, two gears of coaxial setting respective thickness can effectively reduce the thickness of gear when satisfying transmission meshing demand to effectively alleviate the weight of gear. The application also correspondingly provides a power device.
Description
Technical Field
The application belongs to the technical field of motor transmission, and more particularly relates to a multistage transmission structure and a power device with the same.
Background
Electric bicycles have high requirements for portability. The electric bicycle is provided with a power device for assisting in driving the pedal shaft to rotate, so that a rider can switch between two driving modes of manual stepping and electric driving.
Generally, a power plant includes a motor drive portion and a reduction gear portion. The reduction transmission part comprises a multi-stage transmission gear which is used for reducing the high rotating speed of the motor to a low rotating speed suitable for driving the pedal shaft, so that the number of gears in the multi-stage transmission gear is large; meanwhile, in order to enable the gears to be stably meshed, the thickness of part of the gears in the multi-stage transmission gear is large, so that the weight of a speed reduction transmission part is heavy, and meanwhile, the problems of high manufacturing cost and the like are caused.
Disclosure of Invention
The embodiment of the application aims to provide a multistage transmission structure and a power device with the multistage transmission structure, so as to solve the technical problems of large weight and high cost of the power device on the electric bicycle in the prior art.
In order to achieve the above object, according to an embodiment of the first aspect of the present application, a technical scheme is that a multi-stage transmission structure is provided, including a plurality of gear sets, wherein:
the gear sets comprise an input gear set, an output gear set and an intermediate gear set arranged between the input gear set and the output gear set, and each gear set comprises a gear shaft and at least one gear arranged on the gear shaft;
the gear set comprises two gears which are coaxial in the axial direction of the gear shaft and are arranged at intervals, wherein a nonmetallic baffle is arranged on the gear shaft and positioned between the two gears.
Optionally, the barrier is a plastic barrier.
Optionally, the baffle member is a plastic shaft sleeve sleeved on the gear shaft, and the plastic shaft sleeve is in interference fit with the gear shaft or is assembled through a spline.
Optionally, part of the gears in part of the gear set are plastic gears.
Optionally, a metal connecting part is arranged on the gear shaft, and the plastic gear is sleeved outside the metal connecting part.
Optionally, a reinforcing structure is arranged on one side, connected with the plastic gear, of the metal connecting part.
Optionally, the metal connection part is a metal gear or a spline sleeve.
Optionally, the metal connecting portion is integrally formed on the gear shaft.
Optionally, the gears meshed with each other among the gear sets are helical gears.
In a technical solution of an embodiment of the second aspect of the present application, a power device is provided, including a motor and the aforementioned multi-stage transmission structure, where an input gear set of the multi-stage transmission structure is in driving connection with an output shaft of the motor.
The multistage transmission structure and the power device provided by the embodiment of the application have the following beneficial effects at least:
by arranging the nonmetallic baffle piece between the two gears coaxially arranged on the partial gear set, as the baffle piece has a certain thickness, the thickness of each of the two gears coaxially arranged can meet the transmission engagement requirement, and simultaneously, the thickness of the gears can be effectively reduced, so that the weight of the gears (namely, the weight of the multistage transmission structure) can be effectively reduced, and the manufacturing cost of the multistage transmission structure can be reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required for the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a perspective view of a power plant in some embodiments of the present application;
FIG. 2 is a front view of a power plant in some embodiments of the present application;
FIG. 3 is an exploded view of an intermediate gear set in some embodiments of the present application;
FIG. 4 is an exploded view of an input gearset according to some embodiments of the present application;
FIG. 5 is a cross-sectional view of an input gearset according to some embodiments of the present application.
Wherein, each reference sign in the figure:
110. an input gearset;
111. a first gear;
112. a second gear;
120. an intermediate gear set;
121. a third gear;
122. a fourth gear;
130. an output gearset;
140. a barrier;
150. a metal connection part;
200. a motor;
210. an output shaft;
300. a pedal shaft.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved by the present application more clear, the present application is further described in detail below with reference to the accompanying drawings and embodiments.
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element.
When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present application and simplify description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.
In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Referring to fig. 1 to 5, a multi-stage transmission structure according to an embodiment of the first aspect of the present application will now be described.
Referring to fig. 1-2, the multi-stage transmission structure described herein includes a plurality of gear sets.
In some embodiments, taking three-stage reduction as an example, the gear sets include an input gear set 110, an intermediate gear set 120, and an output gear set 130, each of which includes a gear shaft and at least one gear disposed on the gear shaft.
The input gearset 110 is connected to the power input. Specifically, the power input may be the output shaft 210 of the motor 200; further, the gear of the input gear set 110 may be directly sleeved on the output shaft 210 of the motor 200, or a tooth form may be formed on one end of the output shaft 210 of the motor 200, the input gear set 110 is disposed on one side of the output shaft 210 of the motor 200, and one gear thereon is meshed with the tooth form on the output shaft 210 of the motor 200, so as to implement input transmission.
It will be appreciated that in the present embodiment, the input gear set 110 is arranged in the second arrangement described above, that is, the input gear set 110 includes two gears (i.e., the first gear 111 and the second gear 112) that are coaxially and synchronously rotatably arranged, wherein the first gear 111 is meshed with the teeth on the output shaft 210 of the motor 200, and the second gear 112 is meshed with the intermediate gear set 120.
The intermediate gear set 120 is disposed between the input gear set 110 and the output gear set 130, and includes two gears (i.e., a third gear 121 and a fourth gear 122) disposed coaxially and in synchronous rotation. Wherein the third gear 121 is meshed with the second gear 112 on the input gearset 110 and the fourth gear 122 is meshed with the output gearset 130.
The output gear set 130 is connected to a pedal shaft 300 on the electric bicycle. Specifically, the output gearset 130 may be arranged in a variety of ways, such as: the output gear set 130 may include a gear (i.e., the fifth gear 131) directly sleeved on the pedal shaft 300 (in this case, the pedal shaft 300, i.e., the gear shaft of the output gear set 130), or the output gear set 130 may include an output gear shaft sleeved on the pedal shaft 300, where the fifth gear 131 is sleeved on the output gear shaft. The fifth gear 131 is in meshed connection with the fourth gear 122 on the intermediate gear set 120.
Generally, in the related art, gears in most gear sets are metal gears, so that gears on adjacent two-stage gear sets can be in stable meshing connection, and the thickness of the gears on each stage of gear sets is thicker; meanwhile, for convenience in assembly, the end faces of the two gears on the partial gear set are mutually abutted.
Therefore, the gear thickness on the gear set is larger, so that the weight of the multi-stage transmission structure is larger, and the production and manufacturing cost of the multi-stage transmission structure is increased.
To this end, referring to fig. 2 to 3, in the present application, the partial gear set includes two gears coaxially and alternately arranged in the axial direction of the gear shaft, wherein a non-metallic barrier 140 is provided on the gear shaft between the two gears.
The baffle member 140 is used for spacing two coaxial gears, so that the thickness of the gears can be effectively reduced on the premise that the gears are stably meshed with the gears on the adjacent gear sets, and the purposes of reducing the weight of the gears and reducing the production and manufacturing costs of the gears are achieved; furthermore, the rotational inertia of the gear can be reduced while the weight of the gear is reduced, so that the speed reduction transmission of the multistage transmission structure is more accurate.
Referring to fig. 2 to 3, in particular to the present embodiment, a barrier 140 is provided between the third gear 121 and the fourth gear 122 on the intermediate gear set 120.
It can be understood that the nonmetallic material can be a plastic material, and only needs to have certain hardness to meet the requirement of resisting the extrusion force on the axial direction generated when the gears rotate, so that the axial distance between two gears coaxially arranged is prevented from being influenced due to overlarge deformation, and the transmission precision between the two gears coaxially arranged and the adjacent gear sets is further influenced.
The baffle 140 may be a sleeve sleeved on the gear shaft, or the baffle 140 may be a non-metal nut screwed on the gear shaft, or of course, the baffle 140 may be provided in other forms such as a plastic clip, which is not limited thereto.
It is understood that in some embodiments, the barrier 140 is a plastic barrier 140. Thus, the barrier 140 is lightweight and inexpensive to manufacture.
Referring to fig. 2-3, further, in some embodiments, the barrier 140 is a plastic sleeve that fits over the gear shaft.
In this way, the baffle 140 is set as a plastic shaft sleeve, which is convenient to manufacture and install, so that the production cost can be saved.
In addition, it is to be understood that the plastic shaft sleeve can be directly sleeved on the gear shaft and a certain gap exists between the plastic shaft sleeve and the gear shaft; the plastic shaft sleeve can be in interference fit with the gear shaft, or can be assembled with the gear shaft through a spline.
In some embodiments, the partial gears of the partial gear set are plastic gears. In particular, in this embodiment, the first gear 111 on the input gearset 110 is a plastic gear.
Since the first gear 111 is meshed with the tooth form on the output shaft 210 of the motor 200, and the rotational speed of the output shaft 210 of the motor 200 is extremely high, the rotational speed of the first gear 111 is also high. If the first gear 111 is made of a metallic material, a larger volume will result in a larger mass of the first gear 111, which will significantly increase the moment of inertia of the first gear 111, which in turn will significantly result in a loss of transferred energy.
Therefore, in this embodiment, the first gear 111 is a plastic gear, so that the mass of the first gear 111 can be effectively reduced, the moment of inertia of the first gear 111 can be further reduced, and finally the purpose of reducing the transmission energy loss can be achieved, thereby realizing high-efficiency transmission.
Further, it should be understood that the rotation speed of the input gear set 110 is high, and is also responsible for torque transmission, and in the case that the first gear 111 is a plastic gear, a large contact stress exists between the first gear 111 and the output shaft 210 of the motor 200, so that a slipping phenomenon is very easy to occur between the first gear 111 and the gear shaft, thereby affecting the accuracy of transmission.
To this end, referring to fig. 4 to 5, in some embodiments, a metal connection part 150 is provided on the gear shaft, the metal connection part 150 is fixedly connected with the gear shaft, and a plastic gear engaged with an adjacent gear set is sleeved outside the metal connection part 150. That is, in particular, in the embodiment of the present application, the metal connection portion 150 is provided between the first gear 111 and the gear shaft.
By arranging the metal connecting part 150 between the first gear 111 and the gear shaft, the contact area between the first gear 111 and the gear shaft can be increased, so that the friction force between the first gear 111 and the gear shaft is increased, and the first gear 111 and the gear shaft can maintain a stable connection state under a high-rotation-speed working condition, so that the transmission precision is effectively ensured.
Further, in order to improve the connection stability between the metal connection part 150 and the first gear 111, a reinforcing structure is provided on the outer side surface of the metal connection part 150, and the reinforcing structure protrudes or is recessed from the surface of the metal connection part 150. In this way, the contact area between the metal connection part 150 and the first gear 111 is larger, and the connection stability between the two is better.
Specifically, the reinforcing structure may be a rib structure extending in the thickness direction on the surface of the metal connection portion 150, may be a bump formed on the surface of the metal connection portion 150 in an array, or may be a groove formed on the surface of the metal connection portion 150.
Referring to fig. 4, in some embodiments, the metal connection 150 is a metal gear or spline sleeve. In the arrangement mode that the metal connection part 150 is a metal gear, when the metal connection part 150 is formed by machining, the gear can be directly cast by adopting a casting die, so that the machining cost can be saved.
It will be appreciated that in the foregoing embodiments of the metal connection part 150, the metal connection part 150 is integrally formed on the gear shaft, and at the same time, the first gear 111 is integrally formed on the metal connection part 150.
Specifically, the input gearset 110 is manufactured by the steps of:
the first step: first, the second gear 112 is in interference fit with the gear shaft, so that the second gear 112 and the gear shaft are connected and fixed to form a first semi-finished product;
and a second step of: forming a metal connecting part 150 on a first semi-finished product which is connected and fixed in a whole and is positioned at an axial mounting position of a first gear 111, wherein the forming mode of the metal connecting part 150 can be die casting, specifically, a casting die is sleeved at the axial mounting position of the first gear 111 on the first semi-finished product, and the metal connecting part 150 is formed on a gear shaft of the first semi-finished product through a metal forming mode of powder metallurgy to form a second semi-finished product;
in the third step, the second semi-finished product is placed on an injection mold, and the first gear 111 is injection molded on the metal connection part 150 through an injection molding process, thereby completing the processing, assembly and molding of the input gear set 110.
In some embodiments, the gears of the intermeshing gear sets are helical gears.
By setting the gears in the multi-stage transmission structure as helical gears, the following is achieved:
on one hand, the bearing capacity of each single gear can be improved, so that the volume of each gear can be reduced under the condition of meeting the load, and the purpose of light weight is achieved;
on the other hand, by arranging the gears as helical gears, noise generated when the gears are meshed for transmission can be reduced;
on the other hand, the helical gear is stable in transmission, and can be stably meshed under the working condition of high rotation speed, so that the smoothness of meshing transmission is improved.
Referring to fig. 1 to 2, in a second aspect of the present application, a power device for being provided on an electric bicycle to assist the electric bicycle in running is provided.
Specifically, the power device is provided with the multistage transmission structure in any of the foregoing embodiments, wherein the input gear set 110 of the multistage transmission structure is connected to the output shaft 210 of the motor 200, and the output gear set 130 of the multistage transmission structure is drivingly connected to the pedal shaft 300 of the electric bicycle.
Meanwhile, it should be understood that a unidirectional device is provided between the pedal shaft 300 and the multi-stage transmission structure. In the manual stepping mode, the unidirectional device prevents the pedal shaft 300 from driving the gears on the multi-stage transmission structure to rotate; in the case of the assistance of the motor 200, the multistage transmission structure drives the pedal shaft 300 to rotate, thereby achieving electric driving.
It will be appreciated that in the case of a multi-stage transmission arrangement having the aforementioned advantages, the power plant also has the aforementioned advantages.
The foregoing description of the preferred embodiments of the present application is not intended to be limiting, but is intended to cover any and all modifications, equivalents, and alternatives falling within the spirit and principles of the present application.
Claims (10)
1. A multistage transmission structure comprising a plurality of gear sets, wherein:
the gear sets comprise an input gear set, an output gear set and an intermediate gear set arranged between the input gear set and the output gear set, and each gear set comprises a gear shaft and at least one gear arranged on the gear shaft;
the gear set comprises two gears which are coaxial in the axial direction of the gear shaft and are arranged at intervals, wherein a nonmetallic baffle is arranged on the gear shaft and positioned between the two gears.
2. The multi-stage transmission structure of claim 1, wherein: the baffle is a plastic baffle.
3. A multi-stage drive structure as claimed in claim 1 or 2, wherein: the baffle piece is a plastic shaft sleeve sleeved on the gear shaft, and the plastic shaft sleeve is in interference fit with the gear shaft or is assembled through a spline.
4. A multi-stage drive structure as claimed in claim 1 or 2, wherein: part of the gears in part of the gear sets are plastic gears.
5. The multi-stage transmission structure of claim 4, wherein: the gear shaft is provided with a metal connecting part, and the plastic gear is sleeved outside the metal connecting part.
6. The multi-stage transmission structure of claim 4, wherein: one side of the metal connecting part, which is connected with the plastic gear, is provided with a reinforcing structure.
7. The multi-stage transmission structure of claim 6, wherein: the metal connecting part is a metal gear or a spline sleeve.
8. The multi-stage transmission structure of claim 4, wherein: the metal connecting part is integrally formed on the gear shaft.
9. The multi-stage transmission structure of claim 1, wherein: the gears which are meshed and connected with each other among the gear sets are helical gears.
10. A power plant, characterized in that: comprising an electric motor and a multi-stage transmission according to any one of claims 1 to 9, an input gearset of the multi-stage transmission being in driving connection with an output shaft of the electric motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320504069.2U CN219452805U (en) | 2023-03-09 | 2023-03-09 | Multistage transmission structure and power device with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320504069.2U CN219452805U (en) | 2023-03-09 | 2023-03-09 | Multistage transmission structure and power device with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219452805U true CN219452805U (en) | 2023-08-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320504069.2U Active CN219452805U (en) | 2023-03-09 | 2023-03-09 | Multistage transmission structure and power device with same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219452805U (en) |
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- 2023-03-09 CN CN202320504069.2U patent/CN219452805U/en active Active
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