CN112728022A - Double-speed transmission for electric automobile - Google Patents
Double-speed transmission for electric automobile Download PDFInfo
- Publication number
- CN112728022A CN112728022A CN202110038565.9A CN202110038565A CN112728022A CN 112728022 A CN112728022 A CN 112728022A CN 202110038565 A CN202110038565 A CN 202110038565A CN 112728022 A CN112728022 A CN 112728022A
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- CN
- China
- Prior art keywords
- gear
- brake
- carrier
- ring
- sun gear
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H3/00—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion
- F16H3/44—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion using gears having orbital motion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/08—General details of gearing of gearings with members having orbital motion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/08—General details of gearing of gearings with members having orbital motion
- F16H57/10—Braking arrangements
Abstract
The invention discloses a double-speed transmission for an electric automobile, which comprises a first planetary gear set, a second planetary gear set, a differential, a first brake and a second brake, wherein the first planetary gear set comprises a first sun gear, a first planetary gear carrier and a first annular gear ring which are distributed from inside to outside; the first ring-shaped gear ring is fixedly connected with the second planet carrier, the first planet carrier is fixedly connected with the second sun gear, the first planet carrier is connected with the first brake, and the second planet carrier is connected with the second brake. The invention has simple structure, low manufacturing cost, higher gear shifting speed and higher transmission efficiency, and is very suitable for electric automobiles.
Description
Technical Field
The invention relates to a transmission, in particular to a double-speed transmission for an electric automobile.
Background
The electric automobile has the advantages that the driving motor has a very wide output rotating speed, and the driving corresponding speed is very high, so the traditional gearbox is not suitable for the electric automobile. At present, most of electric automobiles adopt a single-stage reduction mechanism as a transmission structure, but the mode is selected in a compromise mode based on the characteristics of wide rotating speed range, extremely high response speed and high working efficiency of a driving motor. The single-stage speed reducing mechanism has certain disadvantages, including that the electric automobile usually has low maximum speed (generally can only reach 140 plus 200KMH, which is far lower than a fuel automobile with the same power), the medium-high speed running acceleration performance is poor (the torque is reduced a lot after the rotating speed reaches a certain condition), and the medium-high speed running energy consumption is high (the actual available capacity of the battery is greatly reduced due to the larger discharging current of the battery after the rotating speed reaches a certain condition).
For the requirement of a speed reduction structure of an electric automobile, the characteristics of quick response, fewer speed change gears and very high transmission efficiency need to be realized, and meanwhile, a reversing gear can not be arranged. Based on the requirement background, if a multistage transmission structure meeting the requirements of the electric automobile can be realized, the acceleration capacity of the electric automobile in the process of traveling at the highest speed and the middle and high speed can be improved, the energy consumption of the electric automobile in the process of traveling at the high speed can be reduced, and the cruising mileage can be increased.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention aims to: a two-speed transmission for an electric vehicle is provided.
The technical solution of the invention is as follows: a double-speed transmission for an electric automobile comprises a first planetary gear set, a second planetary gear set, a differential, a first brake and a second brake, wherein the first planetary gear set comprises a first sun gear, a first planetary gear carrier and a first annular ring gear which are distributed from inside to outside, the first sun gear is used for being connected with a driving shaft of a driving motor, the second planetary gear set comprises a second sun gear, a second planetary gear carrier and a second annular ring gear which are distributed from inside to outside, and the second annular ring gear is used for being connected with the differential;
the first ring-shaped gear ring is fixedly connected with the second planet carrier, the first planet carrier is fixedly connected with the second sun gear, the first planet carrier is connected with the first brake, and the second planet carrier is connected with the second brake.
Further, the first planetary gear of one end of the first planetary gear carrier is engaged with the first sun gear and the first ring gear, and the other end is fixed with one end of the second sun gear.
Further, the second planetary gear of one end of the second planetary carrier is engaged with the second sun gear and the second ring-shaped gear ring, and the other end is fixed with one end of the first ring-shaped gear ring.
Further, the second annular ring gear is connected with the differential through a connecting frame.
Further, when one of the first brake and the second brake is in a braking state, the other is in a non-braking state.
The double-speed transmission for the electric automobile has the beneficial effects that: the gear shifting mechanism is simple in structure, low in manufacturing cost, high in gear shifting speed and high in transmission efficiency, and is very suitable for electric automobiles.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Shown in the figure: 1-first planetary gear set, 11-first sun gear, 12-first planet carrier, 121-first planet gear, 13-first ring gear, 2-second planetary gear set, 21-second sun gear, 22-second planet carrier, 221-second planet gear, 23-second ring gear, 3-differential, 4-first brake, 5-second brake, 6-drive motor, 61-drive shaft, 7-connecting carrier.
Detailed Description
For a more intuitive and complete understanding of the technical solution of the present invention, the following non-limiting features are described in conjunction with the accompanying drawings of the present invention:
as shown in fig. 1, a two-speed transmission for an electric vehicle comprises a first planetary gear set 1, a second planetary gear set 2, a differential 3, a first brake 4 and a second brake 5, wherein the first planetary gear set 1 comprises a first sun gear 11, a first planet carrier 12 and a first annular ring gear 13 which are distributed from inside to outside, the first sun gear 11 is used for connecting a driving shaft 61 of a driving motor 6, the second planetary gear set 2 comprises a second sun gear 21, a second planet carrier 22 and a second annular ring gear 23 which are distributed from inside to outside, the second annular ring gear 23 is connected with the differential 3 through a connecting frame 7, and the differential 3 is used for transmitting driving force to driving wheels of the vehicle;
the first ring gear 13 is fixedly connected to the second planet carrier 22, the first planet carrier 12 is fixedly connected to the second sun gear 21, the first planet carrier 12 is connected to the first brake 4, and the second planet carrier 22 is connected to the second brake 5.
The first planetary gears 121 at one end of the first carrier 12 are engaged with the first sun gear 11 and the first ring gear 13, and the other end is fixed to one end of the second sun gear 21.
The second planetary gears 221 on one end of the second carrier 22 are engaged with the second sun gear 21 and the second ring gear 23, and the other end is fixed to one end of the first ring gear 13.
When one of the first brake 4 and the second brake 5 is in a braking state and the other is in a non-braking state, namely, the invention only allows one brake to be in a braking state at most, and the two-speed gear is realized by switching the states of the first brake 4 and the second brake 5.
The working principle of the invention is as follows:
when the first brake 4 is released and the second brake 5 is held, the first ring gear 13 of the first planetary gear set 1 and the second carrier 22 of the second planetary gear set 2 are in a stationary state. The first sun gear 11 of the first planetary gear set 1 drives the forward rotation, and the first planetary gear carrier 12 and the second sun gear 21 are directly connected to drive the second sun gear 21 to rotate together with the forward rotation. Meanwhile, since the second planetary carrier 22 is in a stationary state, the second sun gear 21 is normally operated to drive the second ring gear 23 to normally operate, which is a high reduction gear.
When the first brake 4 is kept braked and the second brake 5 is released, the first planet carrier 12 of the first planetary gear set 1 and the second sun gear 21 of the second planetary gear set 2 are in a stationary state. The first ring gear 13 is driven by the first sun gear 11 of the first planetary gear set 1 to rotate in reverse, and the second carrier 22 to which the first ring gear 13 is connected is synchronized to rotate in reverse. The second sun gear 21 of the second planetary gear set 2 remains stationary and reverse operation of the second planet carrier 22 causes forward operation of the second ring gear 23, which is a low reduction ratio gear.
According to the calculation formula of the transmission ratio of the planetary gear set: ns + K Nr- (1+ K) Nh ═ 0
Where Ns represents sun gear speed; nr represents the ring gear rotational speed; nh represents the planet carrier speed; k represents the ring gear to sun gear tooth ratio.
When the first brake 4 is released and the second brake 5 is kept braked, Nr 1-Nh 2-0, the first planetary gear carrier 12 and the second sun gear 21 are fixedly connected and keep the same speed, and the final transmission speed is kept
Nr1 represents the rotational speed of the first ring gear 13, Nh2 represents the rotational speed of the second ring gear 23, Ns1 represents the rotational speed of the first sun gear 11, K2 represents the gear ratio of the second ring gear 23 to the second sun gear 21, and K1 represents the gear ratio of the first ring gear 13 to the first sun gear 11.
When the first brake 4 keeps braking and the second brake 5 releases braking: nh1 is Ns2 is 0, and since the first ring gear 13 is fixedly connected to the second planet carrier 22, and the speed is kept the same, the final transmission speed is obtained
Nh1 represents the rotational speed of the first carrier 12, Ns2 represents the rotational speed of the second sun gear 21, Nr2 represents the rotational speed of the second ring gear 23, Ns1 represents the rotational speed of the first sun gear 11, K2 represents the gear ratio of the second ring gear 23 to the second sun gear 21, and K1 represents the gear ratio of the first ring gear 13 to the first sun gear 11.
When the vehicle needs to be backed, the driving direction of the driving motor 6 only needs to be changed, and the driving can be realized.
It should be understood that the above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and that the present invention is not limited by the above description and drawings.
Claims (5)
1. A double-speed transmission for an electric automobile is characterized in that: the brake system comprises a first planetary gear set, a second planetary gear set, a differential mechanism, a first brake and a second brake, wherein the first planetary gear set comprises a first sun gear, a first planetary gear carrier and a first annular ring gear which are distributed from inside to outside, the first sun gear is used for being connected with a driving shaft of a driving motor, the second planetary gear set comprises a second sun gear, a second planetary gear carrier and a second annular ring gear which are distributed from inside to outside, and the second annular ring gear is used for being connected with the differential mechanism;
the first ring-shaped gear ring is fixedly connected with the second planet carrier, the first planet carrier is fixedly connected with the second sun gear, the first planet carrier is connected with the first brake, and the second planet carrier is connected with the second brake.
2. The two-speed transmission for the electric vehicle as claimed in claim 1, wherein: the first planet gear at one end of the first planet gear carrier is meshed with the first sun gear and the first annular gear ring, and the other end of the first planet gear carrier is fixed with one end of the second sun gear.
3. The two-speed transmission for the electric vehicle as claimed in claim 1, wherein: the second planet gear at one end of the second planet gear carrier is meshed with the second sun gear and the second annular gear ring, and the other end of the second planet gear carrier is fixed with one end of the first annular gear ring.
4. The two-speed transmission for the electric vehicle as claimed in claim 1, wherein: the second annular gear ring is connected with the differential mechanism through a connecting frame.
5. The two-speed transmission for the electric vehicle as claimed in claim 1, wherein: when one of the first brake and the second brake is in a braking state, the other brake is in a non-braking state.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110038565.9A CN112728022A (en) | 2021-01-12 | 2021-01-12 | Double-speed transmission for electric automobile |
| CN202210018660.7A CN114294386A (en) | 2021-01-12 | 2022-01-08 | Double-speed transmission for electric automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110038565.9A CN112728022A (en) | 2021-01-12 | 2021-01-12 | Double-speed transmission for electric automobile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112728022A true CN112728022A (en) | 2021-04-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110038565.9A Pending CN112728022A (en) | 2021-01-12 | 2021-01-12 | Double-speed transmission for electric automobile |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112728022A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114294386A (en) * | 2021-01-12 | 2022-04-08 | 花潍 | Double-speed transmission for electric automobile |
-
2021
- 2021-01-12 CN CN202110038565.9A patent/CN112728022A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114294386A (en) * | 2021-01-12 | 2022-04-08 | 花潍 | Double-speed transmission for electric automobile |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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| WD01 | Invention patent application deemed withdrawn after publication | ||
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Application publication date: 20210430 |