CN216833217U - Two-gear speed change mechanism of electric vehicle by utilizing planetary gear train and fixed axle gear train - Google Patents
Two-gear speed change mechanism of electric vehicle by utilizing planetary gear train and fixed axle gear train Download PDFInfo
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- CN216833217U CN216833217U CN202220482601.0U CN202220482601U CN216833217U CN 216833217 U CN216833217 U CN 216833217U CN 202220482601 U CN202220482601 U CN 202220482601U CN 216833217 U CN216833217 U CN 216833217U
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Abstract
The utility model provides an electric vehicle two-gear speed change mechanism utilizing a planetary gear train and a fixed axle gear train, which comprises a motor, a first clutch, the planetary gear train, the fixed axle gear train, a second clutch and an output shaft; in a low gear, the first clutch is closed, and the second clutch is released; in the high gear, the second clutch is closed, and the first clutch is released. The utility model can obtain larger torque at low speed, is stable and powerful when starting and climbing, can reduce the rotating speed of the motor at high speed, ensures that the motor always works at medium and low rotating speeds, and can improve the working efficiency, reduce the loss and improve the endurance mileage; and no power interruption is caused when two gears are shifted, the shifting is rapid and stable, and the impact is small.
Description
Technical Field
The utility model relates to an electric vehicle gear box wheel technical field especially relates to an utilize two grades of speed change mechanisms of electric vehicle of planetary gear train and ordinary gear train.
Background
With the development of new energy technology and the requirement of environmental protection, electric vehicles are gradually replacing fuel vehicles and become common vehicles in people's lives. Most adoption motor of electric vehicle that has now on the market directly drives, the motor adds fixed transmission ratio drive modes such as one-level roller gear speed reduction or motor adds hold-in range (or chain) speed reduction, or can't obtain big moment of torsion when having the low speed, or the motor can only high rotational speed operation when having the high speed, lead to the motor to generate heat highly, and aggravate motor structure wearing and tearing, the life-span descends, and the motor is when high rotational speed, work efficiency reduces, the continuation of the journey mileage shortens, cause energy utilization not high, be not conform to energy saving and emission reduction's development requirement.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the defects existing in the prior art and providing an electric vehicle two-gear speed change mechanism utilizing a planetary gear train and a fixed axle gear train.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a two-gear speed change mechanism of an electric vehicle utilizing a planetary gear train and a fixed-axis gear train comprises a motor, a first clutch, the planetary gear train, the fixed-axis gear train, a second clutch and an output shaft;
the planetary gear train comprises a sun gear, a planet gear, an inner gear ring and a planet carrier, wherein the sun gear is positioned in the center of the planetary gear train, the planet gear is rotatably supported on the planet carrier and is meshed with the sun gear, the inner gear ring is fixedly connected with the whole speed change mechanism box body, and the planetary gear train is normally meshed;
the ordinary gear train comprises a first gear, a second gear, a third gear and a fourth gear, wherein the first gear is in constant mesh with the third gear, and the second gear is in constant mesh with the fourth gear;
an outer shell of the first clutch is fixedly connected with a rotating shaft of the motor, an inner shell of the first clutch is fixedly connected with a sun gear, and the planet carrier is fixedly connected with the first gear; the outer shell of the second clutch is fixedly connected with the rotating shaft of the motor, and the inner shell of the second clutch is fixedly connected with the second gear; the sun gear, the first gear and the second gear are rotatably supported on a rotating shaft of the motor, and the third gear and the fourth gear are fixedly connected with the output shaft.
Preferably, the housing of the first clutch is fixedly connected with the rotating shaft of the motor in an interference or spline manner; the inner shell of the first clutch and the sun gear are of an integrated structure, or the inner shell of the first clutch and the sun gear are fixedly connected in an interference or spline mode.
Preferably, the housing of the second clutch is fixedly connected with the rotating shaft of the motor in an interference or spline manner; the inner shell of the second clutch and the second gear are of an integrated structure, or the inner shell of the second clutch and the second gear are fixedly connected in an interference or spline mode.
Preferably, the sun gear, the first gear and the second gear are rotatably supported on a rotating shaft of the motor through rolling bearings.
Preferably, the planet wheel is rotatably supported on the planet carrier by a rolling bearing.
Preferably, the third gear and the fourth gear are fixedly connected to the output shaft by interference or spline.
Preferably, the first clutch and the second clutch are wet friction plate clutches.
The utility model discloses utilize planetary gear train and ordinary gear train to and two clutches, set up two gears of low-speed gear and high-speed gear.
When the speed is low, the first clutch is closed, the second clutch is released, and the power of the motor is transmitted to the sun gear through the first clutch, is transmitted to the planet carrier and the first gear through the planetary gear train, and is further transmitted to the third gear and the output shaft;
and when the high-speed gear is shifted, the second clutch is closed, the first clutch is released, and the power of the motor is transmitted to the second gear through the second clutch and then transmitted to the fourth gear and the output shaft.
In the transition state of mutual gear shifting between the low gear and the high gear, the first clutch and the second clutch are both in a half-clutch state, so that unpowered interruption of the two-gear speed change mechanism during gear shifting can be realized.
Compared with the prior constant transmission ratio driving modes such as direct drive of the motor of the electric vehicle, reduction of the motor by a primary cylindrical gear or reduction of the motor by a synchronous belt (or a chain), the speed change mechanism combining the planetary gear train and the fixed-axis gear train can realize torque at low speed or larger torque, is stable and powerful when starting and climbing, can realize reduction of the rotating speed of the motor at high speed, ensures that the motor always works at medium and low rotating speeds, and can improve the working efficiency, reduce the loss and improve the endurance mileage; and no power interruption is caused when two gears are shifted, the shifting is rapid and stable, and the impact is small.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a two-speed transmission mechanism of an electric vehicle using a planetary gear train and a fixed-axis gear train.
Wherein, 1, a motor; 2. a rotating shaft; 3. a first clutch; 3-1, a housing of the first clutch; 3-2, an inner housing of the first clutch; 4. a sun gear; 5. a planet wheel; 6. an inner gear ring; 7. a planet carrier; 8. a first gear; 9. a second gear; 10. a second clutch; 10-1, a housing of the second clutch; 10-2, an inner housing of the second clutch; 11. a third gear; 12. a fourth gear; 13. and an output shaft.
Detailed Description
In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Referring to fig. 1, a two-gear speed change mechanism of an electric vehicle using a planetary gear train and an ordinary gear train comprises a motor 1, a first clutch 3, the planetary gear train, the ordinary gear train, a second clutch 10 and an output shaft 13;
the planetary gear train comprises a sun gear 4, a planet gear 5, an inner gear ring 6 and a planet carrier 7, wherein the sun gear 4 is positioned in the center of the planetary gear train, the planet gear 5 is rotatably supported on the planet carrier 7 and is engaged with the sun gear 4, the inner gear ring 6 is fixedly connected with the whole speed change mechanism box body, and the planetary gear train is normally engaged;
the fixed gear train comprises a first gear 8, a second gear 9, a third gear 11 and a fourth gear 12, wherein the first gear 8 is constantly meshed with the third gear 11, and the second gear 9 is constantly meshed with the fourth gear 12;
an outer shell 3-1 of the first clutch 3 is fixedly connected with a rotating shaft 2 of the motor 1, an inner shell 3-2 of the first clutch 3 is fixedly connected with a sun gear 4, and a planet carrier 7 is fixedly connected with a first gear 8; an outer shell 10-1 of the second clutch 10 is fixedly connected with a rotating shaft 2 of the motor 1, and an inner shell 10-2 of the second clutch 10 is fixedly connected with a second gear 9; the sun gear 4, the first gear 8 and the second gear 9 are all rotatably supported on the rotating shaft 2 of the motor 1, and the third gear 11 and the fourth gear 12 are all fixedly connected with an output shaft 13.
In practical use, the utility model discloses a variable speed mechanism is total two gears, is low-speed gear and high-speed gear respectively.
When the low gear is used, the first clutch 3 is controlled to be closed, and the second clutch 10 is controlled to be released; the rotating shaft 2 of the motor 1 rotates, the power of the rotating shaft is transmitted to the sun gear 4 through the first clutch 3, is transmitted to the planet gear 5 through the planetary gear train, and is further transmitted to the planet carrier 7 and the first gear 8, the first gear 8 is constantly meshed with the third gear 11, and the third gear 11 is connected with the output shaft 13, so that the power is transmitted to the third gear 11 and the output shaft 13, and the output shaft 13 outputs and drives the electric vehicle to run.
When the high gear is used, the second clutch 10 is controlled to be closed, and the first clutch 3 is controlled to be released; the rotating shaft 2 of the motor 1 rotates, the power thereof is transmitted to the second gear 9 through the second clutch 10, the second gear 9 is constantly meshed with the fourth gear 12, and the fourth gear 12 is connected with the output shaft 13, so that the power is transmitted to the fourth gear 12 and the output shaft 13, and the output shaft 13 outputs and drives the electric vehicle to run.
When the gears are switched before the high gear and the low gear, the first clutch 3 and the second clutch 10 are both in a half-clutch state, so that unpowered interruption during gear shifting can be realized, the gear shifting is rapid and stable, and the impact is small.
In a preferred embodiment, the housing 3-1 of the first clutch 3 is fixedly connected with the rotating shaft 2 of the motor 1 in an interference or spline manner; the inner shell 3-2 of the first clutch 3 and the sun gear 4 are of an integral structure, or the inner shell 3-2 of the first clutch 3 and the sun gear 4 are fixedly connected in an interference or spline mode, so that the connection between the outer shell 3-1 of the first clutch 3 and the rotating shaft 2 of the motor 1, the connection between the inner shell 3-2 of the first clutch 3 and the sun gear 4 are firm and reliable, and the force transmission is accurate.
In one embodiment, the housing 10-1 of the second clutch 10 is fixedly connected with the rotating shaft 2 of the motor 1 in an interference or spline manner; the inner shell 10-2 of the second clutch 10 and the second gear 9 are of an integrated structure, or the inner shell 10-2 of the second clutch 10 and the second gear 9 are fixedly connected in an interference or spline mode, so that the connection between the outer shell 10-1 of the second clutch 10 and the rotating shaft 2 of the motor 1 and the connection between the inner shell 10-2 of the second clutch 10 and the second gear 9 are firm and reliable, and accurate force transmission is realized.
In one embodiment, the sun gear 4, the first gear 8, and the second gear 9 are rotatably supported on the rotating shaft 2 of the motor 1. The sun gear 4 can only be driven to rotate by the first clutch 3, the first gear 8 can only be driven to rotate by the planet carrier 7, and the second gear 9 can only be driven to rotate by the second clutch 10.
In one embodiment, the planet wheels 5 are rotatably supported on a planet carrier 7.
In an embodiment, the third gear 11 and the fourth gear 12 are fixedly connected to the output shaft 13 by interference or spline.
In one embodiment, the first clutch 3 and the second clutch 10 are wet friction plate clutches.
The speed change mechanism of the utility model adopts the planetary gear train and the ordinary gear train, so that higher torque can be obtained at low speed, and the speed change mechanism is stable and powerful when starting and climbing; at high speed, the rotating speed of the motor can be reduced, so that the motor can always work at medium and low rotating speeds, and the effects of improving the working efficiency, reducing the loss, improving the endurance mileage and the like are achieved; and the two-gear speed change mechanism can realize no power interruption during gear shifting, and has the advantages of rapid and stable gear shifting and small impact.
The present invention has been described in relation to the above embodiments, which are only examples for implementing the present invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. On the contrary, all changes and modifications which do not depart from the spirit and scope of the present invention are deemed to fall within the scope of the present invention.
Claims (7)
1. A two-gear speed change mechanism of an electric vehicle by utilizing a planetary gear train and a fixed gear train is characterized in that: comprises a motor, a first clutch, a planetary gear train, a fixed-axis gear train, a second clutch and an output shaft;
the planetary gear train comprises a sun gear, a planet gear, an inner gear ring and a planet carrier, wherein the sun gear is positioned in the center of the planetary gear train, the planet gear is rotatably supported on the planet carrier and is meshed with the sun gear, the inner gear ring is fixedly connected with the whole speed change mechanism box body, and the planetary gear train is normally meshed;
the ordinary gear train comprises a first gear, a second gear, a third gear and a fourth gear, wherein the first gear is in constant mesh with the third gear, and the second gear is in constant mesh with the fourth gear;
an outer shell of the first clutch is fixedly connected with a rotating shaft of the motor, an inner shell of the first clutch is fixedly connected with a sun gear, and the planet carrier is fixedly connected with the first gear; the outer shell of the second clutch is fixedly connected with the rotating shaft of the motor, and the inner shell of the second clutch is fixedly connected with the second gear; the sun gear, the first gear and the second gear are rotatably supported on a rotating shaft of the motor, and the third gear and the fourth gear are fixedly connected with the output shaft.
2. The electric vehicle two-speed transmission mechanism using the planetary gear train and the fixed gear train as claimed in claim 1, wherein: the shell of the first clutch is fixedly connected with the rotating shaft of the motor in an interference or spline mode; the inner shell of the first clutch and the sun gear are of an integrated structure, or the inner shell of the first clutch and the sun gear are fixedly connected in an interference or spline mode.
3. The electric vehicle two-speed transmission mechanism using the planetary gear train and the fixed gear train as claimed in claim 1, wherein: the shell of the second clutch is fixedly connected with the rotating shaft of the motor in an interference or spline mode; the inner shell of the second clutch and the second gear are of an integrated structure, or the inner shell of the second clutch and the second gear are fixedly connected in an interference or spline mode.
4. The electric vehicle two-speed transmission mechanism using the planetary gear train and the fixed gear train as claimed in claim 1, wherein: the sun gear, the first gear and the second gear are rotatably supported on a rotating shaft of the motor through rolling bearings.
5. The electric vehicle two-speed transmission mechanism using the planetary gear train and the fixed gear train as claimed in claim 1, wherein: the planet wheel is rotatably supported on the planet carrier through a rolling bearing.
6. The electric vehicle two-speed transmission mechanism using the planetary gear train and the fixed gear train as claimed in claim 1, wherein: the third gear and the fourth gear are fixedly connected to the output shaft in an interference or spline mode.
7. The electric vehicle two-speed transmission mechanism using the planetary gear train and the fixed gear train as claimed in claim 1, wherein: the first clutch and the second clutch are wet friction plate clutches.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220482601.0U CN216833217U (en) | 2022-03-08 | 2022-03-08 | Two-gear speed change mechanism of electric vehicle by utilizing planetary gear train and fixed axle gear train |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220482601.0U CN216833217U (en) | 2022-03-08 | 2022-03-08 | Two-gear speed change mechanism of electric vehicle by utilizing planetary gear train and fixed axle gear train |
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| CN216833217U true CN216833217U (en) | 2022-06-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220482601.0U Active CN216833217U (en) | 2022-03-08 | 2022-03-08 | Two-gear speed change mechanism of electric vehicle by utilizing planetary gear train and fixed axle gear train |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2025044284A1 (en) * | 2023-08-29 | 2025-03-06 | 比亚迪股份有限公司 | Vehicle driving system and vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2025044284A1 (en) * | 2023-08-29 | 2025-03-06 | 比亚迪股份有限公司 | Vehicle driving system and vehicle |
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