CN219975292U - Speed reducer, electric drive transmission system and automobile - Google Patents
Speed reducer, electric drive transmission system and automobile Download PDFInfo
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- CN219975292U CN219975292U CN202321504473.6U CN202321504473U CN219975292U CN 219975292 U CN219975292 U CN 219975292U CN 202321504473 U CN202321504473 U CN 202321504473U CN 219975292 U CN219975292 U CN 219975292U
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- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 58
- 230000005540 biological transmission Effects 0.000 title claims abstract description 20
- 230000009467 reduction Effects 0.000 abstract description 13
- 230000004323 axial length Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000006872 improvement Effects 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
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Abstract
The utility model provides a speed reducer, an electric drive transmission system and an automobile, and relates to the technical field of automobiles. The speed reducer is more compact in structure, smaller in occupied volume, capable of realizing large reduction ratio without more parts, and lighter in weight.
Description
Technical Field
The utility model relates to the technical field of automobiles, in particular to a speed reducer, an electric drive transmission system and an automobile.
Background
With the development of new energy automobile industry, electric automobiles have become a development trend. Electric vehicles currently sold on the market generally have a weight greater than that of conventional fuel vehicles because of the larger batteries required to increase endurance. Under the trend of increasing sales of electric vehicles, the development of light weight of the electric vehicles is imperative, and the importance of the electric vehicles on the reduction of various parts in the electric vehicles is higher and higher.
Under the same output power, the motor torque is reduced by increasing the motor rotation speed, so that the axial length of the motor can be reduced, the weight of the motor can be effectively reduced, and the weight reduction of the electric automobile is facilitated. The motor has high rotating speed and low torque, so that the speed reducer connected with the motor is required to have higher speed ratio, and the current speed reducer design of the electric automobile is mostly a parallel shaft speed reducer.
Disclosure of Invention
The utility model aims to solve the problems of large occupied volume and heavy weight of the existing speed reducer.
In order to solve the problems, the utility model provides a speed reducer, which comprises a first sun gear, a first planet carrier, a first planet gear, a second sun gear, a second planet carrier, a second planet gear, a first gear ring, a second gear ring, a connecting frame and a shell, wherein the first sun gear is used for being connected with an output end of a motor, the first planet carrier is fixedly connected with the shell, the first planet gear is rotationally connected to the first planet carrier, the first planet gear is respectively meshed with the first sun gear and the first gear ring, the second sun gear is fixedly connected with the first gear ring through the connecting frame, the second planet gear is rotationally connected to the second planet gear, the second planet gear is respectively meshed with the second sun gear and the second gear ring, and the second gear ring is fixedly connected with the shell.
Compared with the prior art, the speed reducer provided by the utility model has the following technical effects:
in the speed reducer, a first planet carrier and a second gear ring are fixedly connected with a shell, the first planet carrier and the second gear ring provide a fixed point of the whole speed reducer, wherein a first sun gear is connected with an output end of a motor, namely, the first sun gear is used as an input end of the speed reducer, the first sun gear, the first planet carrier, the first planet gears and the first gear ring jointly form a first planet row structure, the second sun gear, the second planet carrier, the second planet gears and the second gear ring jointly form a second planet row structure, the first planet row structure and the second planet row structure can be connected together through a connecting frame, and further, the speed reducer integrally has a larger speed reduction ratio through superposition of speed reduction functions of the two planet row structures, and then can be applicable to the motor of high rotational speed, low moment of torsion, finally make the axial length of motor can design to be shorter, make motor reduce volume and weight as far as possible, moreover, this speed reducer is not traditional parallel shaft speed reducer, first sun gear, first planet carrier, first ring gear, the link, the second sun gear, second ring gear and second planet carrier all can be coaxial setting, and first planet wheel setting is between first ring gear and first sun gear, the second planet wheel setting is between second ring gear and second sun gear, this speed reducer structure is compacter, occupy the volume less, just can realize big reduction ratio without more spare part simultaneously, weight is also lighter.
Further, the second planet gear is a duplex gear, the duplex gear comprises a second large planet gear and a second small planet gear which are fixedly connected with each other, the duplex gear is meshed with the second sun gear through the second large planet gear, and the duplex gear is meshed with the second gear ring through the second small planet gear.
Further, the speed reducer further comprises an output shaft, and the output shaft is coaxially connected with the second planet carrier.
Further, the first planet carrier comprises a first planet carrier body and a first planet shaft, the first planet shaft is fixedly connected to the first planet carrier body, and the first planet is rotatably sleeved on the first planet wheel shaft.
Further, the second planet carrier comprises a second planet carrier body and a second planet wheel shaft, the second planet wheel shaft is fixedly connected to the second planet carrier body, and the second planet wheel is rotatably sleeved on the second planet wheel shaft.
Further, one end of the connecting frame is connected with the outer ring wall of the first gear ring, and the other end of the connecting frame is connected with the second sun gear.
Further, the number of the first planetary gears is at least three, and/or the number of the second planetary gears is at least three.
The utility model also provides an electric drive transmission system which comprises a motor and the speed reducer, wherein the output end of the motor is in driving connection with a first sun gear of the speed reducer.
Because the technical improvement and the technical effect of the electric drive transmission system are the same as those of the speed reducer, the electric drive transmission system is not repeated.
Further, the motor comprises a stator, a rotor and a rotating shaft, wherein the stator is fixedly connected with the shell of the speed reducer, and the rotating shaft is respectively connected with the rotor and the first sun gear.
The utility model also provides an automobile comprising the electric drive transmission system.
Since technical improvements and technical effects of the automobile are the same as those of the electric drive transmission system, the automobile will not be described in detail.
Drawings
Fig. 1 is a schematic structural diagram of a speed reducer according to an embodiment of the present utility model.
Reference numerals illustrate:
11. a first sun gear; 12. a second sun gear; 21. a first planet carrier; 211. a first carrier body; 212. a first planetary axle; 22. a second carrier; 221. a second carrier body; 222. a second planetary axle; 31. a first planet; 32. a second planet wheel; 321. a second large planet; 322. a second small planet; 41. a first ring gear; 42. a second ring gear; 51. a connecting frame; 61. a motor; 611. a stator; 612. a rotor; 613. a rotating shaft; 71. an output shaft.
Detailed Description
In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "front", "rear", etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
Also, in the drawings, the X-axis indicates the longitudinal direction, that is, the front-rear direction, and the positive direction of the X-axis indicates the front, and the negative direction of the X-axis indicates the rear. It should also be noted that the foregoing X-axis is provided merely for the purpose of describing the present utility model and for simplicity of description, and is not intended to indicate or imply that the devices or elements referred to must be in a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the utility model.
In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "coupled," and "mated" are to be construed broadly, and may be, for example, fixedly coupled, detachably coupled, or integrally coupled; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those skilled in the art according to the specific circumstances.
Referring to fig. 1, a speed reducer according to an embodiment of the present utility model includes a first sun gear 11, a first planet carrier 21, a first planet gear 31, a second sun gear 12, a second planet carrier 22, a second planet gear 32, a first ring gear 41, a second ring gear 42, a connection carrier 51 and a housing (not shown in the drawing), where the first sun gear 11 is used for being connected to an output end of a motor 61, the first planet carrier 21 is fixedly connected to the housing, the first planet gear 31 is rotatably connected to the first planet carrier 21, and the first planet gear 31 is meshed with the first sun gear 11 and the first ring gear 41, the second sun gear 12 is fixedly connected to the first ring gear 41 through a connection carrier 51, the second planet gear 32 is rotatably connected to the second planet carrier 22, and the second planet gear 32 is meshed with the second sun gear 12 and the second ring gear 42, respectively, and the second ring gear 42 is fixedly connected to the housing.
In this embodiment, in the speed reducer, the first planet carrier 21 and the second gear ring 42 are fixedly connected with the housing, the first planet carrier 21 and the second gear ring 42 provide a fixed point of the whole speed reducer, wherein the first sun gear 11 is connected with the output end of the motor 61, that is, the first sun gear 11 is used as the input end of the speed reducer, the first sun gear 11, the first planet carrier 21, the first planet gears 31 and the first gear ring 41 together form a first planet row structure, the second sun gear 12, the second planet carrier 22, the second planet gears 32 and the second gear ring 42 together form a second planet row structure, the first planet row structure and the second planet row structure are associated together through the connecting carrier 51, and further through superposition of the speed reducing functions of the two planet row structures, the speed reducer is enabled to have a larger speed reducing ratio, and further be applicable to the motor 61 with high rotation speed and low torque, and finally the axial length of the motor 61 can be designed to be shorter, the motor 61 is enabled to reduce the volume and the weight as much as possible, the speed reducer is not a traditional parallel shaft speed reducer, the first planet gear 11, the first planet carrier 21, the second planet gear 32 and the second planet gear 41 are required to be more compact than the first planet carrier 12, the second planet carrier 32 and the second planet gear 41 are more compact than the first planet carrier 12 and the first gear ring gear 41 are arranged between the first planet carrier and the first gear 41 and the first gear ring gear 41, and the first gear 41 are more compact than the first planet carrier and the first gear structure, and the first gear structure can be more compact.
Specifically, when the motor 61 drives the first sun gear 11 to rotate, the first sun gear 11 further drives the first planet gear 31 to rotate (because the first planet carrier 21 is fixed to the housing, the first planet gear 31 can only rotate and cannot revolve around the first sun gear 11), the rotation of the first planet gear 31 further drives the first gear ring 41 to rotate, and then the first gear ring 41 drives the second sun gear 12 to rotate, the rotation of the second sun gear 12 drives the second planet gear 32 to rotate, and because the second planet gear 32 is meshed with the fixed second gear ring 42, the second planet gear 32 also rotates while rolling along the second gear ring 42, that is, the second planet gear 32 revolves around the second sun gear 12 while rotating, thereby driving the rotation of the second planet carrier 22, and the second planet carrier 22 realizes the output of torque and rotation speed. That is, the torque transmission path of the speed reducer is, in order: the first sun gear 11-first planet gears 31-first ring gear 41-second sun gear 12-second planet gears 32-second planet carrier 22.
Referring to fig. 1, alternatively, the second planetary gear 32 is a double gear including a second large planetary gear 321 and a second small planetary gear 322 fixedly connected to each other, the double gear being meshed with the second sun gear 12 through the second large planetary gear 321, and the double gear being meshed with the second ring gear 42 through the second small planetary gear 322.
In this embodiment, the second planet gear 32 may be a double gear (the large gear and the small gear in the double gear are fixedly connected and synchronously rotate), the large gear in the double gear is denoted as a second large planet gear 321, the small gear in the double gear is denoted as a second small planet gear 322, wherein the second large planet gear 321 is meshed with the second sun gear 12, and the second small planet gear 322 is meshed with the second ring gear 42.
In this case, as described above, the first sun gear 11, the first carrier 21, the first planet gears 31, and the first ring gear 41 together form a first planetary gear arrangement, and the second sun gear 12, the second carrier 22, the second planet gears 32, and the second ring gear 42 together form a second planetary gear arrangement. Then, the reduction ratio i of the first planetary gear structure 1 ＝z 41 /z 11 Wherein z is 41 Z is the number of teeth of the first ring gear 41 11 The reduction ratio i of the second planetary gear set is the number of teeth of the first sun gear 11 2 ＝(z 42 /z 12 )/(z 321 /z 322 ) Wherein z is 42 Z is the number of teeth of the second ring gear 42 12 Z is the number of teeth of the second sun gear 12 321 Z is the number of teeth of the second large planetary gear 321 322 The total reduction ratio i of the speed reducer is the number of teeth of the second small planet gears 322 Total (S) ＝i 1 *(i 2 +1), when the output rotation speed of the motor 61 is N, then at the reduction ratio, the output rotation speed of the second carrier 22 in the speed reducer is N/i Total (S) . As can be seen from the above description, in the case where the second planetary gear 32 is a double gear, the reduction ratio of the speed reducer is higher, and the occupied volume is only increased by the axial length of the second large planetary gear 321 or the second small planetary gear 322, so that the size of the speed reducer in other directions is not increased, and the volume, the weight and the speed ratio of the speed reducer are further optimized.
Of course, in other embodiments, it is not excluded that the second planetary gear 32 is only a common gear, not a double gear, and the reduction gear in this case still has a smaller volume and weight than the conventional parallel shaft reduction gear, while having a large reduction ratio.
Referring to fig. 1, optionally, the speed reducer further includes an output shaft 71, and the output shaft 71 is coaxially connected with the second planet carrier 22.
In this embodiment, the output end of the speed reducer is specifically an output shaft 71, the output shaft 71 is coaxially and fixedly connected with the second planet carrier 22, and the speed reducer is conveniently connected with other external shaft parts in a transmission manner through the output shaft 71.
The output shaft 71 and the second planet carrier 22 may be integrally formed, so as to ensure structural strength therebetween.
Referring to fig. 1, optionally, the first planet carrier 21 includes a first planet carrier body 211 and a first planet axle 212, the first planet axle 212 is fixedly connected to the first planet carrier body 211, and the first planet 31 is rotatably sleeved on the first planet axle 212.
In this embodiment, the first planet axle 212 is fixed relative to the first planet carrier body 211, the first planet axle 212 is rotatably sleeved on the first planet axle 212, the first planet axle 212 and the first planet carrier body 211 are in a rigid connection relationship, and the first planet 31 is rotatably sleeved on the first planet axle 212, so that the first planet 31 is convenient to install. The first planetary gear shaft 212 and the first planetary carrier body 211 may be an integrally formed structure, so as to ensure structural strength therebetween.
Referring to fig. 1, optionally, the second planet carrier 22 includes a second planet carrier body 221 and a second planet axle 222, the second planet axle 222 is fixedly connected to the second planet carrier body 221, and the second planet wheel 32 is rotatably sleeved on the second planet axle 222.
In this embodiment, the second planetary gear shaft 222 is fixed relative to the second planetary gear carrier body 221, the second planetary gear 32 is movably sleeved on the second planetary gear shaft 222, the second planetary gear shaft 222 is in a rigid connection relationship with the second planetary gear carrier body 221, and the second planetary gear 32 is rotatably sleeved on the second planetary gear shaft 222, so that the second planetary gear 32 is convenient to install. The second planetary gear shaft 222 and the second planetary carrier body 221 may be an integrally formed structure, so as to ensure structural strength therebetween.
Referring to fig. 1, alternatively, one end of the connecting carrier 51 is connected to the outer ring wall of the first ring gear 41, and the other end of the connecting carrier 51 is connected to the second sun gear 12.
In this embodiment, one end of the connecting frame 51 may be in a cylindrical structure or a frame structure, and is fixedly sleeved on the outer ring wall of the first gear ring 41, instead of being connected to one axial end of the first gear ring 41, the connecting frame 51 and the first gear ring 41 are partially overlapped in the axial direction, so that after the connecting frame 51 and the first gear ring 41 are fixedly connected, the structure is more stable, the axial length of the speed reducer can be reduced, and the other end of the connecting frame 51 may be a shaft member for fixedly connecting the second sun gear 12.
Optionally, the number of the first planetary gears 31 is at least three, and/or the number of the second planetary gears 32 is at least three.
In this embodiment, the number of the first planetary gears 31 is at least three, each first planetary gear 31 is meshed with the first sun gear 11 and the first ring gear 41 respectively, so that the stability of the transmission of the first planetary gear structure can be ensured, and similarly, the number of the second planetary gears 32 is at least three, each second planetary gear 32 is meshed with the second sun gear 12 and the second ring gear 42 respectively, so that the stability of the transmission of the second planetary gear structure can be ensured. Preferably, the number of the first planetary gears 31 and the number of the second planetary gears 32 are three, so that the transmission stability is ensured, and the overall weight of the speed reducer is reduced as much as possible.
An electric drive transmission system according to another embodiment of the present utility model includes a motor 61 and a speed reducer as described above, where an output end of the motor 61 is in driving connection with a first sun gear 11 of the speed reducer.
Because the technical improvement and the technical effect of the electric drive transmission system are the same as those of the speed reducer, the electric drive transmission system is not repeated.
Referring to fig. 1, optionally, the motor 61 includes a stator 611, a rotor 612, and a rotating shaft 613, wherein the stator 611 is fixedly connected with a housing of the speed reducer, and the rotating shaft 613 is respectively connected with the rotor 612 and the first sun gear 11.
In this embodiment, the stator 611 of the motor 61 may share a housing with a speed reducer, and the electric drive system integrates the motor 61 and the speed reducer, so as to reduce the space occupation of the automobile.
An automobile in accordance with yet another embodiment of the present utility model includes an electric drive train as described above.
Since technical improvements and technical effects of the automobile are the same as those of the electric drive transmission system, the automobile will not be described in detail.
The terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" and "a second" may explicitly or implicitly include at least one such feature.
Although the utility model is disclosed above, the scope of the utility model is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the utility model, and these changes and modifications will fall within the scope of the utility model.
Claims (10)
1. The utility model provides a speed reducer, its characterized in that includes first sun gear (11), first planet carrier (21), first planet wheel (31), second sun gear (12), second planet carrier (22), second planet wheel (32), first ring gear (41), second ring gear (42), link (51) and casing, first sun gear (11) are used for being connected with the output of motor (61), first planet carrier (21) with casing fixed connection, first planet wheel (31) rotate connect in on first planet carrier (21), just first planet wheel (31) respectively with first sun gear (11) and first ring gear (41) meshing, second sun gear (12) pass through link (51) with first ring gear (41) fixed connection, second planet wheel (32) are connected with on second planet carrier (22) rotate respectively with second sun gear (12) and second ring gear (42) fixed connection.
2. The speed reducer according to claim 1, characterized in that the second planetary gear (32) is a double gear comprising a second large planetary gear (321) and a second small planetary gear (322) fixedly connected to each other, the double gear being meshed with the second sun gear (12) by the second large planetary gear (321), the double gear being meshed with the second ring gear (42) by the second small planetary gear (322).
3. The speed reducer according to claim 1, further comprising an output shaft (71), said output shaft (71) being coaxially connected with said second planet carrier (22).
4. The speed reducer according to claim 1, wherein the first planet carrier (21) comprises a first planet carrier body (211) and a first planet axle (212), the first planet axle (212) is fixedly connected to the first planet carrier body (211), and the first planet (31) is rotatably sleeved on the first planet axle (212).
5. The speed reducer according to claim 1, wherein the second planet carrier (22) comprises a second planet carrier body (221) and a second planet axle (222), the second planet axle (222) is fixedly connected to the second planet carrier body (221), and the second planet wheel (32) is rotatably sleeved on the second planet axle (222).
6. The speed reducer according to claim 1, wherein one end of the connecting frame (51) is connected to an outer ring wall of the first ring gear (41), and the other end of the connecting frame (51) is connected to the second sun gear (12).
7. The speed reducer according to claim 1, characterized in that the number of first planet wheels (31) is at least three and/or the number of second planet wheels (32) is at least three.
8. An electric drive transmission system, characterized by comprising an electric motor (61) and a speed reducer according to any one of claims 1-7, the output of the electric motor (61) being in driving connection with a first sun gear (11) of the speed reducer.
9. The electric drive system according to claim 8, characterized in that the motor (61) comprises a stator (611), a rotor (612) and a shaft (613), the stator (611) being fixedly connected with the housing of the speed reducer, the shaft (613) being connected with the rotor (612) and the first sun gear (11), respectively.
10. An automobile comprising an electric drive transmission system according to claim 8 or 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321504473.6U CN219975292U (en) | 2023-06-13 | 2023-06-13 | Speed reducer, electric drive transmission system and automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321504473.6U CN219975292U (en) | 2023-06-13 | 2023-06-13 | Speed reducer, electric drive transmission system and automobile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219975292U true CN219975292U (en) | 2023-11-07 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321504473.6U Active CN219975292U (en) | 2023-06-13 | 2023-06-13 | Speed reducer, electric drive transmission system and automobile |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219975292U (en) |
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2023
- 2023-06-13 CN CN202321504473.6U patent/CN219975292U/en active Active
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