CN211617427U - Two-gear rear axle power system of pure electric vehicle - Google Patents
Two-gear rear axle power system of pure electric vehicle Download PDFInfo
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- CN211617427U CN211617427U CN201921215688.XU CN201921215688U CN211617427U CN 211617427 U CN211617427 U CN 211617427U CN 201921215688 U CN201921215688 U CN 201921215688U CN 211617427 U CN211617427 U CN 211617427U
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Abstract
The utility model discloses a two-gear rear axle power system of a pure electric vehicle, which comprises a motor, a motor shaft, a clutch, a one-way clutch, an inner shaft, an outer shaft, a planet row, a rear sun gear, a rear planet gear and an output shaft; the planet row comprises: the planet carrier comprises a gear ring, a front planet wheel, a front sun wheel, a planet shaft and a planet carrier. And the outer race and the inner race of the one-way clutch are controlled to be combined and disconnected to form two-gear power switching. The first gear power path is provided by the driving motor 1, sequentially passes through a motor shaft, a clutch, an outer shaft, a front sun gear, a front planet gear, a planet shaft and a planet carrier, and is output from an output shaft; the second gear power is added with a path which is provided by the driving motor at the same time, sequentially passes through the motor shaft, the clutch, the inner shaft, the rear sun gear, the rear planet gear, the planet shaft and the planet carrier, and is output from the output shaft. The system simplifies the clutch structure, is simple to control, reduces the cost and simultaneously realizes the power function of the two-gear rear axle of the electric automobile.
Description
Technical Field
The utility model relates to a pure electric vehicles, concretely relates to two grades of rear axle driving systems of pure electric vehicles.
Background
The pure electric automobile two-gear rear axle power system in the prior art comprises a driving motor, a planet row, a rear sun gear, a rear planet gear, a first clutch, a second clutch and an output shaft; the planet row comprises a front sun gear, a gear ring, a planet carrier and a front planet gear; the driving motor respectively carries out power transmission with the front sun gear and the rear sun gear through the first clutch and the second clutch, and a two-gear function is achieved. Therefore, two clutches are adopted to realize power transmission of two gears, the two clutches are complex in structure and large in occupied space, and a control system required for meeting the power switching of the two gears is complex; the two clutches are combined and disconnected, so that overload sliding abrasion is reduced during gear shifting, the requirement on a control system is high, and in order to meet the requirement on shifting performance, the two clutches are usually wet clutches, so that the structure is complex and the cost is high.
Disclosure of Invention
The utility model discloses a two grades of rear axle driving system of pure electric vehicles has simplified the clutch structure, and control is simple, and the cost is reduced realizes two grades of rear axle power functions of electric vehicles simultaneously.
The utility model discloses a two-gear rear axle power system of a pure electric vehicle, which comprises a motor, a motor shaft, a clutch, a one-way clutch, an inner shaft, an outer shaft, a planet row, a rear sun gear, a rear planet gear and an output shaft;
the planet row comprises: the planetary gear comprises a gear ring, a front planet wheel, a front sun wheel, a planet shaft and a planet carrier; the front sun wheel and the rear sun wheel are arranged in parallel from left to right, the front planet wheel and the rear planet wheel are fixedly connected and are sleeved on a planet shaft of a planet carrier of the planet row in a left-right parallel manner, the front sun wheel and the rear sun wheel are respectively meshed with the front planet wheel and the rear planet wheel, and the front planet wheel is meshed with the gear ring;
the motor power is output through a motor shaft;
the clutch is positioned between the driving motor and the planet row, an outer hub of the clutch is fixedly connected with the output end of a motor shaft, and an inner hub of the clutch is fixedly connected with the input end of an outer shaft;
the inner shaft is sleeved in the outer shaft in a hollow mode, the inner shaft extends out of two ends of the outer shaft, the input end of the inner shaft is fixedly connected with the outer hub of the clutch, and the output end of the inner shaft is fixedly connected with the rear sun wheel; the output end of the outer shaft is fixedly connected with the front sun wheel;
the one-way clutch is arranged outside the gear ring, an outer race of the one-way clutch is fixed, and an inner race of the one-way clutch 4 is fixedly connected with the gear ring;
and the output end of the planet carrier of the planet row is fixedly connected with the output shaft.
Further, the number of gear teeth of the front sun gear 7 is larger than that of the rear sun gear, and the number of gear teeth of the front planetary gear is smaller than that of the rear planetary gear.
Further, the clutch is a dry clutch.
Further, the first clutch is a dry electromagnetic clutch.
Further, the clutch is a dry hydraulic clutch.
The utility model discloses beneficial technological effect does:
1) through the arranged clutch and one-way clutch, the common double clutch is replaced by the clutch needing to be controlled and the one-way clutch not needing to be controlled, so that the power transmission of two gears is realized; the structure is simple, the volume is small, and the cost is low;
2) the gear switching is realized by the combination and disconnection control of the clutch and the one-way clutch, the one-way clutch has one-way torque transmission capacity, so that the phenomenon that the double clutches are overloaded and worn during gear shifting is avoided, the control strategies of the one-way clutch and the clutch are simpler, the stability is improved, and the cost is reduced.
3) The front sun gear 7 has a larger number of gear teeth than the rear sun gear 12, and the front planetary gear 8 has a smaller number of gear teeth than the rear planetary gear 11. The two-gear speed can be increased by realizing a larger transmission ratio, so that the power system has a larger speed change range, and the system has higher efficiency and better economic performance.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
Referring to fig. 1, a two-gear rear axle power system of a pure electric vehicle includes: the motor comprises a motor 1, a motor shaft 2, a clutch 3, a one-way clutch 4, an inner shaft 6, an outer shaft 5, a planet row, a rear sun gear 12, a rear planet gear 11 and an output shaft 15.
The planet row comprises: ring gear 10, front planet 8, front sun 7, planet shaft 13 and planet carrier 14. The front sun wheel 7 and the rear sun wheel 12 are arranged in parallel from left to right, the front planet wheel 8 is fixedly connected with the rear planet wheel 11 and is sleeved on a planet shaft 13 of a planet carrier 14 of a planet row in parallel from left to right, the front sun wheel 7 and the rear sun wheel 12 are respectively meshed with the front planet wheel 8 and the rear planet wheel 11, and the front planet wheel 8 is meshed with the gear ring 10. The front sun gear 7 has a larger number of gear teeth than the rear sun gear 12, and the front planetary gear 8 has a smaller number of gear teeth than the rear planetary gear 11.
The power of the motor 1 is output through a motor shaft 2.
The clutch 3 is positioned between the driving motor 1 and the planet row, the outer hub of the clutch 3 is fixedly connected with the output end of the motor shaft 2, and the inner hub of the clutch 3 is fixedly connected with the input end of the outer shaft 5.
The inner shaft 6 is sleeved in the outer shaft 5 in an empty way, the inner shaft 6 extends out of two ends of the outer shaft 5, the input end of the inner shaft is fixedly connected with the outer hub of the clutch 3, and the output end of the inner shaft is fixedly connected with the rear sun wheel 12; the output end of the outer shaft 5 is fixedly connected with the front sun wheel 7.
The one-way clutch 4 is arranged outside the ring gear 10, and the outer race of the one-way clutch 4 is fixed and the inner race of the one-way clutch 4 is fixedly coupled with the ring gear 10. The outer race of the one-way clutch 4 is fixed to the vehicle via the frame 9.
The output of the planet carrier 14 of the planet row is fixedly connected to the output shaft 15.
The clutch 3 can be selected as: dry clutches or dry electromagnetic clutches or dry hydraulic clutches. The clutch 3 is a dry clutch, which has low cost, simple control and high mechanical transmission efficiency. The clutch 3 is a dry electromagnetic clutch which can be connected with an electric control system of an automobile and has extremely fast response. The clutch 3 is a dry type hydraulic clutch, the control of the electromagnetic clutch and the hydraulic clutch is simple and stable, the dry type hydraulic clutch can be connected with a hydraulic system of an automobile, the dry type hydraulic clutch can transmit large torque, and the volume of the dry type hydraulic clutch is smaller.
The structure adopts a clutch needing to be controlled and a one-way clutch not needing to be controlled to replace a common double clutch through the arranged clutch and the one-way clutch, so as to realize the power transmission of two gears; the structure is simple, the volume is small, and the cost is low;
the gear switching is realized by the combination and disconnection control of the clutch and the one-way clutch, the one-way clutch has one-way torque transmission capacity, so that the phenomenon that the double clutches are overloaded and worn during gear shifting is avoided, and the control strategies of the one-way clutch and the clutch are simpler than those of the double clutches, so that the stability is improved, and the cost is reduced.
The front sun gear 7 has a larger number of gear teeth than the rear sun gear 12, and the front planetary gear 8 has a smaller number of gear teeth than the rear planetary gear 11. The two-gear speed can be increased by realizing a larger transmission ratio, so that the power system has a larger speed change range, and the system has higher efficiency and better economic performance.
Working principle;
a first gear working mode: the driving motor 1 works, the outer drum and the inner hub of the clutch 3 are disconnected, and the outer race and the inner race of the one-way clutch 4 are combined; the power of the driving motor 1 is transmitted to the rear sun gear 12 through the inner shaft 6, the front planetary gear 8 and the rear planetary gear 11 rotate around the planetary gear shaft 13 of the planetary carrier 14 on the one hand, and revolve around the center line of the rear sun gear 12 on the other hand, and under the condition that the outer race, the inner race and the gear ring 10 of the one-way clutch 4 are fixed and do not rotate, the power of the driving motor 1 sequentially passes through the motor shaft 2, the inner shaft 6, the rear sun gear 12, the rear planetary gear 11, the front planetary gear 8, the planetary shaft 13 and the planetary carrier 14, and finally the power is output through the output shaft 15. At this time, a first gear transmission ratio is formed. A first gear power route: the device comprises a driving motor 1, a motor shaft 2, an inner shaft 6, a rear sun gear 12, a rear planet gear 11, a front planet gear 8, a planet shaft 13, a planet carrier 14 and an output shaft 15.
The second-gear working mode: the driving motor 1 works, the outer drum and the inner hub of the clutch 3 are combined, and the outer race and the inner race of the one-way clutch 4 are disconnected; one path of power is transmitted to the outer shaft 5 and the front sun gear 7 through the clutch 3, and the other path of power is transmitted to the rear sun gear 12 through the inner shaft 6; two power paths from the driving motor 1 are simultaneously transmitted to the front sun gear 7 and the rear sun gear 11, so that the front sun gear 7, the front planet gears 8, the planet shafts 13, the planet carrier 14, the rear sun gear 12 and the rear planet gears 11 are fixed together to rotate around the central line of the front sun gear 7, and finally, the power is output through the output shaft 15. At this time, a second gear ratio is formed.
The second-gear power path is as follows:
the first power is provided by a driving motor 1, sequentially passes through a motor shaft 2, a clutch 3, an outer shaft 5, a front sun gear 7, a front planet gear 8, a planet shaft 13 and a planet carrier 14, and is output from an output shaft 15;
the second power is provided by the driving motor 1 at the same time, passes through the motor shaft 2, the clutch 3, the inner shaft 6, the rear sun gear 12, the rear planet gear 11, the planet shaft 13 and the planet carrier 14 in sequence, and is output from the output shaft 15.
Gear shifting: when the automobile runs in the first gear, the automatic control unit of the transmission knows the running state of the automobile according to the related sensors, and then judges that the automobile enters the second gear if the automobile needs to be accelerated. The method specifically comprises the following steps: when the vehicle runs in the first gear and reaches a gear shifting point needing to shift into the second gear, the clutch 3 is gradually combined, the planetary gear set, the rear sun gear 12 and the rear planetary gear 11 rotate together, the inner race of the one-way clutch 4 is separated from the locking of the outer race and rotates, the inner race and the outer race of the one-way clutch 4 are gradually disconnected, meanwhile, the clutch 3 is further combined until the complete combination is achieved, the whole gear shifting is finished, and the vehicle shifts into the second gear. The process that the vehicle shifts into first gear from two gears is just contrary with the process of shifting into two gears, specifically is: when the vehicle needs to shift the first gear during the second-gear running, the clutch 3 in the combined state is gradually disconnected, and the one-way clutch 4 in the disconnected state is gradually combined at the same time until the clutch 3 is completely disconnected and the one-way clutch 4 is completely combined, so that the whole gear shifting is finished, and the vehicle shifts into the first gear.
When the automobile runs at a first gear, the rotating speed of wheels is excessively high and the wheels are reversely dragged when the automobile runs at a special road section, so that the rotating speed of the driving motor 1 can be reduced, and the combination of the clutch 3 is controlled to be switched to a second gear to realize stable power transmission.
Claims (5)
1. The utility model provides a two grades of rear axle driving system of pure electric vehicles which characterized in that: the planetary gear train comprises a motor (1), a motor shaft (2), a clutch (3), a one-way clutch (4), an inner shaft (6), an outer shaft (5), a planetary row, a rear sun gear (12), a rear planetary gear (11) and an output shaft (15);
the planet row comprises: the planetary gear set comprises a gear ring (10), a front planet wheel (8), a front sun wheel (7), a planet shaft (13) and a planet carrier (14); the front sun wheel (7) and the rear sun wheel (12) are arranged in parallel from left to right, the front planet wheel (8) and the rear planet wheel (11) are fixedly connected and sleeved on a planet shaft (13) of a planet carrier (14) of the planet row from left to right in parallel, the front sun wheel (7) and the rear sun wheel (12) are respectively meshed with the front planet wheel (8) and the rear planet wheel (11), and the front planet wheel (8) is meshed with the gear ring (10);
the power of the motor (1) is output through a motor shaft (2);
the clutch (3) is positioned between the driving motor (1) and the planet row, an outer hub of the clutch (3) is fixedly connected with the output end of the motor shaft (2), and an inner hub of the clutch (3) is fixedly connected with the input end of the outer shaft (5);
the inner shaft (6) is sleeved in the outer shaft (5) in an empty manner, the inner shaft (6) extends out of two ends of the outer shaft (5), the input end of the inner shaft is fixedly connected with the outer hub of the clutch (3), and the output end of the inner shaft is fixedly connected with the rear sun wheel (12); the output end of the outer shaft (5) is fixedly connected with the front sun wheel (7);
the one-way clutch (4) is arranged outside the gear ring (10), the outer race of the one-way clutch (4) is fixed, and the inner race of the one-way clutch (4) is fixedly connected with the gear ring (10);
the output end of the planet carrier (14) of the planet row is fixedly connected with the output shaft (15).
2. The two-gear rear axle power system of the pure electric vehicle according to claim 1, characterized in that: the gear number of the front sun wheel (7) is more than that of the rear sun wheel (12), and the gear number of the front planet wheel (8) is less than that of the rear planet wheel (11).
3. The two-gear rear axle power system of the pure electric vehicle as claimed in claim 2, characterized in that: the clutch (3) is a dry clutch.
4. The two-gear rear axle power system of the pure electric vehicle as claimed in claim 3, characterized in that: the clutch (3) is a dry electromagnetic clutch.
5. The two-gear rear axle power system of the pure electric vehicle as claimed in claim 3, characterized in that: the clutch (3) is a dry hydraulic clutch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921215688.XU CN211617427U (en) | 2019-07-30 | 2019-07-30 | Two-gear rear axle power system of pure electric vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921215688.XU CN211617427U (en) | 2019-07-30 | 2019-07-30 | Two-gear rear axle power system of pure electric vehicle |
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| Publication Number | Publication Date |
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| CN211617427U true CN211617427U (en) | 2020-10-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921215688.XU Active CN211617427U (en) | 2019-07-30 | 2019-07-30 | Two-gear rear axle power system of pure electric vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110435419A (en) * | 2019-07-30 | 2019-11-12 | 重庆青山工业有限责任公司 | A kind of two grades of rear axle power systems of pure electric automobile |
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2019
- 2019-07-30 CN CN201921215688.XU patent/CN211617427U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110435419A (en) * | 2019-07-30 | 2019-11-12 | 重庆青山工业有限责任公司 | A kind of two grades of rear axle power systems of pure electric automobile |
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