阅读说明：本技术 一种四档电驱动汽车的dct自动变速器传动系统 (DCT automatic transmission system of four-gear electrically driven automobile ) 是由 钟志华 胡红舟 于 2020-08-18 设计创作，主要内容包括：本发明涉及新能源汽车技术领域的一种四档电驱动汽车的DCT自动变速器传动系统,电动机的输入扭矩首先经动力输入轴同步传导到动力输入主齿轮,通过切换奇数档离合器或偶数档离合器,将扭矩传到奇数档轴或偶数档轴,奇数档轴或偶数档轴上的扭矩经过各档位对应的齿轮副,再传到输出轴,然后通过差速器传到轮端。该DCT自动变速器传动系统结构紧凑,能够充分发挥电动机与该传动系统的优点,适合使用电动机驱动的汽车使用。(The invention relates to a DCT automatic transmission system of a four-gear electrically driven automobile in the technical field of new energy automobiles. The DCT automatic transmission system has a compact structure, can fully exert the advantages of the motor and the transmission system, and is suitable for automobiles driven by the motor.)

1. The utility model provides a DCT automatic gearbox transmission system of four grades of electric drive cars, includes transmission fit's motor (15), power input shaft, gear drive group, output shaft (13), differential mechanism (16) in proper order, its characterized in that: the gear transmission set comprises a power input main gear (3) sleeved on the power input shaft, an odd-numbered gear transmission gear (1), a first-numbered gear transmission gear (4) and a third-numbered gear transmission gear (8) sleeved on the odd-numbered gear shaft (12), an even-numbered gear transmission gear (2), a second-numbered gear transmission gear (6) and a fourth-numbered gear transmission gear (11) sleeved on the even-numbered gear shaft (14), and a first-numbered output gear (5), a second-numbered output gear (7), a third-numbered output gear (9) and a fourth-numbered output gear (10) sleeved on an output shaft (13);

the odd-numbered gear transmission gear (1) is provided with an odd-numbered gear clutch (21) which drives the power input main gear (3) to be meshed with the odd-numbered gear transmission gear (1);

the even-numbered gear transmission gears (2) are provided with even-numbered gear clutches (22) which drive the power input main gear (3) to be meshed with the even-numbered gear transmission gears (2);

the first gear transmission gear (4), the second gear transmission gear (6), the third gear transmission gear (8) and the fourth gear transmission gear (11) are sequentially provided with a first gear synchronizer (17), a second gear synchronizer (18), a third gear synchronizer (19) and a fourth gear synchronizer (20);

under the driving of the respective synchronizers, the first gear transmission gear (4), the second gear transmission gear (6), the third gear transmission gear (8) and the fourth gear transmission gear (11) are sequentially meshed with the first gear output gear (5), the second gear output gear (7), the third gear output gear (9) and the fourth gear output gear (10).

2. The DCT automatic transmission drive system of a four-gear electrically driven vehicle according to claim 1, wherein: the first gear output gear (5), the second gear output gear (7), the third gear output gear (9) and the fourth gear output gear (10) are sequentially sleeved on the output shaft (13).

3. The DCT automatic transmission drive system of a four-gear electrically driven vehicle according to claim 2, characterized in that: the fourth gear output gear (10) is close to the differential (16) relative to the first gear output gear (5), the second gear output gear (7) and the third gear output gear (9).

Technical Field

The invention relates to the technical field of new energy automobiles, in particular to a DCT (discrete cosine transformation) automatic transmission system of an electric automobile.

Background

The design scheme of the DCT of the current electric automobile comes from a fuel oil vehicle and is not suitable for the requirement of the power transmission of the current new energy vehicle. Electrically driven new energy vehicles require a multi-gear gearbox to accommodate the power characteristics of the electric motor. The design of the reduction gearbox which is driven by a pure motor and has one gear to two gears at present cannot meet the requirement of a new energy vehicle on power when the vehicle runs at high speed. Meanwhile, the automobile also puts forward more requirements on electrically driven new energy vehicles in light weight and the challenge of environmental protection. Therefore, it is necessary to design an automatic gearbox with multiple gears.

Disclosure of Invention

The invention aims to provide a DCT (double clutch transmission) automatic transmission system of a four-gear electrically driven automobile, which has a more compact structure and higher power transmission efficiency.

The purpose of the invention is realized as follows: a DCT automatic transmission system of a four-gear electrically-driven automobile comprises a motor, a power input shaft, a gear transmission group, an output shaft, a differential mechanism, an odd-gear shaft and an even-gear shaft which are sequentially in transmission fit, wherein the gear transmission group comprises a power input main gear sleeved on the power input shaft, an odd-gear transmission gear, a first-gear transmission gear and a third-gear transmission gear sleeved on the odd-gear shaft, an even-gear transmission gear, a second-gear transmission gear and a fourth-gear transmission gear sleeved on the even-gear shaft, and a first-gear output gear, a second-gear output gear, a third-gear output gear and a fourth-gear output gear sleeved on the output shaft;

the odd-numbered gear transmission gear is provided with an odd-numbered gear clutch which drives the power input main gear to be meshed with the odd-numbered gear transmission gear;

the even-numbered gear transmission gear is provided with an even-numbered gear clutch which drives the power input main gear to be meshed with the even-numbered gear transmission gear;

the first gear transmission gear, the second gear transmission gear, the third gear transmission gear and the fourth gear transmission gear are sequentially provided with a first gear synchronizer, a second gear synchronizer, a third gear synchronizer and a fourth gear synchronizer;

under the driving of the respective synchronizers, the first gear transmission gear, the second gear transmission gear, the third gear transmission gear and the fourth gear transmission gear are sequentially meshed with the first gear output gear, the second gear output gear, the third gear output gear and the fourth gear output gear.

Furthermore, the first gear output gear, the second gear output gear, the third gear output gear and the fourth gear output gear are sequentially sleeved on the output shaft.

Further, the fourth gear output gear is adjacent to the differential relative to the first gear output gear, the second gear output gear and the third gear output gear.

The invention has the beneficial effects that:

1. compared with the prior art, one shaft is reduced, gears, bearings and weight are reduced, the speed change gear reaches four gears, the driving requirement of the electric automobile on a power system is met, transition gears, chain mechanisms and accessory parts (such as bearings) are omitted, the structure is more compact, and the power transmission efficiency is higher;

2. the input torque of the motor is firstly synchronously transmitted to the power input main gear through the power input shaft, the torque is transmitted to the odd-numbered gear shaft or the even-numbered gear shaft by switching the odd-numbered gear clutch or the even-numbered gear clutch, and the torque on the odd-numbered gear shaft or the even-numbered gear shaft is transmitted to the output shaft through the gear pair corresponding to each gear and then transmitted to the wheel end through the differential mechanism.

Drawings

FIG. 1 is a system layout of the present invention.

In the figure, 1 odd-numbered gear, 2 even-numbered gear, 3 power input main gear, 4 first-numbered gear, 5 first-numbered output gear, 6 second-numbered gear, 7 second-numbered output gear, 8 third-numbered gear, 9 third-numbered output gear, 10 fourth-numbered output gear, 11 fourth-numbered gear, 12 odd-numbered gear shaft, 13 output shaft, 14 even-numbered gear shaft, 15 motor, 16 differential, 17 first-numbered gear synchronizer, 18 second-numbered gear synchronizer, 19 third-numbered gear synchronizer, 20 fourth-numbered gear synchronizer, 21 odd-numbered gear clutch, 22 even-numbered gear clutch.

Detailed Description

The invention is further described with reference to the following figures and specific examples.

As shown in fig. 1, a transmission system of a DCT automatic transmission of a four-gear electrically driven automobile includes a motor 15, a power input shaft, a gear transmission set, an output shaft 13, a differential 16, an odd-gear shaft 12 and an even-gear shaft 14, which are sequentially in transmission fit with each other, the gear transmission set includes a power input master gear 3 sleeved on the power input shaft, an odd-gear transmission gear 1, a first-gear transmission gear 4, and a third-gear transmission gear 8 sleeved on the odd-gear shaft 12, an even-gear transmission gear 2, a second-gear transmission gear 6, and a fourth-gear transmission gear 11 sleeved on the even-gear shaft 14, and a first-gear output gear 5, a second-gear output gear 7, a third-gear output gear 9, and a fourth-gear output gear 10 sleeved on the output shaft 13.

As is known in the art, the output torque of the electric motor 15 is first transmitted to the power input shaft.

The odd-numbered stage transmission gear 1 is provided with an odd-numbered stage clutch 21 for driving the power input main gear 3 to mesh with the odd-numbered stage transmission gear 1.

The even-numbered stage transmission gears 2 are provided with even-numbered stage clutches 22 for driving the power input main gear 3 to mesh with the even-numbered stage transmission gears 2.

The first gear transmission gear 4, the second gear transmission gear 6, the third gear transmission gear 8 and the fourth gear transmission gear 11 are sequentially provided with a first gear synchronizer 17, a second gear synchronizer 18, a third gear synchronizer 19 and a fourth gear synchronizer 20.

Under the drive of the respective synchronizers, the first gear transmission gear 4, the second gear transmission gear 6, the third gear transmission gear 8 and the fourth gear transmission gear 11 are sequentially meshed with the first gear output gear 5, the second gear output gear 7, the third gear output gear 9 and the fourth gear output gear 10.

The first gear output gear 5, the second gear output gear 7, the third gear output gear 9 and the fourth gear output gear 10 are sequentially sleeved on the output shaft 13 and sequentially correspond to first to fourth gears; the fourth output gear 10 is adjacent to the differential 16 with respect to the first output gear 5, the second output gear 7, and the third output gear 9.

The following describes the application of the first gear to the fourth gear in this embodiment.

When the first gear is engaged, the odd-numbered gear clutch 21 and the first gear synchronizer 17 are started, the torque of the power input shaft is transmitted to the output shaft 13 through the gear pair (power input main gear 3/odd-numbered gear transmission gear 1), the odd-numbered gear clutch 21 and the gear pair (first gear transmission gear 4/first gear output gear 5), and then transmitted to the wheel end through the differential 16, so that the automobile moves forward at the first gear speed.

When the first gear is shifted up to the second gear, the even-numbered gear clutch 22 and the second gear synchronizer 18 are started, the torque of the power input shaft is transmitted to the output shaft 13 through the gear pair (the power input main gear 3/the even-numbered gear transmission gear 2), the even-numbered gear clutch 22 and the gear pair (the second gear transmission gear 6/the second gear output gear 7), and then the torque is transmitted to the wheel end through the differential 16, so that the automobile can move forward at the second gear speed.

When the gear is shifted up from the second gear to the third gear, the odd-numbered gear clutch 21 and the third-gear synchronizer 19 are started, and the torque of the power input shaft is transmitted to the output shaft 13 through the gear pair (the power input main gear 3/the odd-numbered gear transmission gear 1), the odd-numbered gear clutch 21 and the gear pair (the third-gear transmission gear 8/the third-gear output gear 9) and then to the wheel end through the differential 16.

When the gear is shifted up from the third gear to the fourth gear, the even-numbered gear clutch 22 and the fourth-gear synchronizer 20 are activated, and the torque of the power input shaft is transmitted to the output shaft 13 through the gear pair (power input main gear 3/even-numbered gear transmission gear 2), the even-numbered gear clutch 22, the gear pair (fourth-gear output gear 10/fourth-gear transmission gear 11), and then to the wheel end through the differential 16.

While the preferred embodiments of the present invention have been described, those skilled in the art will appreciate that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined by the appended claims.