阅读说明：本技术 一种紧凑布局的两档同轴电驱动桥 (Two-gear coaxial electric drive axle with compact layout ) 是由 王亚军 王威 石晓翔 于 2021-01-07 设计创作，主要内容包括：本发明属于车辆传动技术领域,具体涉及一种紧凑布局的两档同轴电驱动桥。所述同轴电驱动桥具有两个减速行星排,驱动电机驱动第一行星排的太阳轮,同时第一行星排齿圈和箱体连接,实现第一行星排框架动力输出；完成传动系统一级减速；第一行星排框架和第二行星排太阳轮连接；第二行星排齿圈通过制动器和箱体连接；第二行星排框架和齿圈通过离合器连接；第二行星排框架输出到差速器,所述差速器分别连接左半轴和右半轴。通过控制制动器和离合器实现变速器的不同速比,可以适应不同车速情况下输出的工作转速需求。配合电机的协调控制可以实现输出速度的连续变化,实现车辆经济性的提高。(The invention belongs to the technical field of vehicle transmission, and particularly relates to a two-gear coaxial electric drive axle with compact layout. The coaxial electric drive axle is provided with two speed reduction planet rows, a drive motor drives a sun gear of a first planet row, and meanwhile, a gear ring of the first planet row is connected with the box body, so that the power output of a frame of the first planet row is realized; finishing the first-stage speed reduction of the transmission system; the first planet row frame is connected with the second planet row sun gear; the second planet row gear ring is connected with the box body through a brake; the second planet row frame is connected with the gear ring through a clutch; the second planet row frame outputs to a differential, which is connected to left and right axle shafts, respectively. Different speed ratios of the transmission are realized by controlling the brake and the clutch, and the requirements of the output working rotating speed under different vehicle speeds can be met. The continuous change of the output speed can be realized by matching with the coordinated control of the motor, and the improvement of the vehicle economy is realized.)

1. A compact layout two-speed coaxial electric drive axle, comprising:

a drive motor as a power input;

the half shaft as power output is divided into a left half shaft and a right half shaft;

the method is characterized in that:

the power output device is provided with two speed reduction planet rows, a driving motor drives a sun gear of a first planet row, and meanwhile, a gear ring of the first planet row is connected with a box body, so that the power output of a frame of the first planet row is realized; finishing the first-stage speed reduction of the transmission system;

the first planet row frame is connected with the second planet row sun gear; the second planet row gear ring is connected with the box body through a brake; the second planet row frame is connected with the gear ring through a clutch; the second planet row frame outputs to a differential, which is connected to left and right axle shafts, respectively.

2. The compact two-speed coaxial electric drive axle of claim 1, wherein said drive motor has a hollow structure, and said left axle shaft or said right axle shaft passes through said hollow structure.

3. A compact two-speed coaxial electric drive axle according to claim 1, wherein said differential is a planetary differential with a differential lock.

4. A compact arrangement of two-speed coaxial electric drive axle according to claim 3, wherein said differential lock is a conventional end differential lock or a wet clutch differential lock.

5. A compact layout two-speed coaxial electric drive axle according to claim 3, wherein said planetary differential is a compound planetary row differential; the planetary gear train is composed of a compound planetary gear train with two sun gears, and the two sun gears of the compound planetary gear train are respectively connected with a left half shaft and a right half shaft.

6. The compact two-speed coaxial electric drive axle of claim 5, wherein the two planet gears of the composite planet row differential are meshed with each other to form a coupling tooth of the composite planet row.

Technical Field

The invention belongs to the field of machinery and vehicle transmission, and particularly relates to a coaxial single-motor drive axle.

Background

An electric drive axle for a wheeled vehicle comprises a motor, a planetary gear set, a clutch, a shell, a differential lock and a hydraulic control system.

Different speed ratios of the transmission are realized by controlling different clutches so as to adapt to the working rotating speed requirements output under different vehicle speeds. The motor coordination control can realize continuous change of the output speed and improve the vehicle economy.

The centralized electric drive axle is provided with the planetary speed reducer and the differential mechanism in a centralized mode, and meanwhile the half shafts are connected to the differential mechanism through the centers of the motors by utilizing the space of the motors, so that the overall arrangement convenience of the electric drive axle can be realized. The application of the electric drive axle realizes the energy output, the energy recovery and the stepless speed control of the vehicle. Under different operation demand states of the vehicle, the motor can enter a driving and energy recovery mode, and the requirement of the whole vehicle on the rotating speed range can be met by matching with the planetary speed change mechanism.

Disclosure of Invention

In order to solve the problems, the invention adopts the following technical scheme:

a compact layout two-speed coaxial electric drive axle, comprising: a drive motor as a power input;

the half shaft as power output is divided into a left half shaft and a right half shaft; the power output device is provided with two speed reduction planet rows, a driving motor drives a sun gear of a first planet row, and meanwhile, a gear ring of the first planet row is connected with a box body, so that the power output of a frame of the first planet row is realized; finishing the first-stage speed reduction of the transmission system;

the first planet row frame is connected with the second planet row sun gear; the second planet row gear ring is connected with the box body through a brake; the second planet row frame is connected with the gear ring through a clutch; the second planet row frame outputs to a differential, which is connected to left and right axle shafts, respectively.

Further, the driving motor has a hollow structure, and the left half shaft or the right half shaft passes through the hollow structure.

Further, the differential is a planetary differential with a differential lock.

Further, the differential lock is a general end face differential lock or a wet clutch differential lock.

Furthermore, the planetary differential mechanism is a compound planetary row differential mechanism; the planetary gear train is composed of a compound planetary gear train with two sun gears, and the two sun gears of the compound planetary gear train are respectively connected with a left half shaft and a right half shaft.

Furthermore, two planet wheels of the composite planet row differential mechanism are meshed with each other to form a coupling tooth of the composite planet row.

The invention provides a two-gear coaxial electric drive axle with a compact layout, which can convert electric energy into power to be output to an output shaft and can recover energy in the process of vehicle deceleration, and the electric drive axle is provided with a two-gear planetary reducer which can operate efficiently in a wider range. The electric drive axle is integrated with a planetary differential mechanism and an inter-wheel differential lock.

The electric drive axle is an axle with continuously adjustable motor drive rotating speed. The sun wheel of the first planet row is connected with the power motor; the gear ring of the first planet row is connected to the box body; the first planet row frame and the second planet row sun gear are connected together; the second planet row frame and the second planet row gear ring are connected together through a clutch; the second planet row gear ring is connected with the box body through a brake; the second planet row frame is connected to the frame of the differential planet row. The differential planet row with integrated design can realize the function of the differential in a smaller space and can adaptively change the parameters of the planet row according to the requirement of load; the planetary row differential also has a differential lock element to effect inter-wheel differential locking.

The invention has the following remarkable effects: the driving power input is distributed, independent power output can be realized on each driving axle, so that the vehicle has the pure electric driving functions of energy output and energy recovery, and the original universal shaft of the transmission, the transfer case and power transmission is replaced.

Drawings

FIG. 1 is a schematic diagram of a centralized two-speed electric drive axle connection;

100. a centralized two-gear electric drive bridge is connected with a simplified diagram; 101. a drive motor; 102. an output shaft of the motor; 103. an output half shaft A; 104. an output half shaft B; 105. a first planet row sun gear; 106. a first planet row planet wheel; 107. a first planet row gear ring; 108. a first planet frame; 109. a second planet row sun gear; 110. a second planet row planet wheel; 111. a second planet row gear ring; 112. a brake B1; 113. clutch C1; 114. a second planet carrier; 115. a differential planet row sun gear A; 116. a differential planet wheel A; 117. a differential planet gear B; 118. a differential planet row sun gear B; 119. a differential lock;

Detailed Description

The electric drive axle proposed by the present invention will be described in detail with reference to the accompanying drawings and examples.

The embodiments of the present invention described below are not intended to be exhaustive or to limit the invention to the precise forms disclosed in the following embodiments. Rather, the embodiments are chosen and described so that others skilled in the art may appreciate and understand the principles and implementations of the present invention.

As shown in fig. 1, the present invention relates to a two-gear coaxial electric drive axle with a compact layout. Such as a centralized electric drive axle 100 shown in fig. 1. It includes: a drive motor 101; a first planet row sun 105 for power input; a first planet row ring gear 107 and; a first planet row planet 106; a first planet row frame 108; the first planetary row is a fixed-ratio planetary row, and the cooperation of the clutch C1 and the brake B1 can enable the second planetary row to have two fixed ratios; the second planet row sun gear 109 is connected with the first planet row frame 108; the second planet row ring gear 111 is connected with the box body through a brake B1; a second planetary row frame 114 as a power output; a planetary row differential and a differential lock 119; output half shaft A103 and output half shaft B104.

In the exemplary embodiment, clutch C1 and brake B1 are engaged to form two operating gears, respectively, of the second planetary gear set; when the clutch C1 is engaged to disengage the brake B1, the power of the driving motor 101 enters the first planetary row through the first planetary row sun gear 105, is output to the second planetary row sun gear 109 through the first planetary row frame 108 after the rotational speed of the driving motor 101 is reduced, and is output to the second planetary row frame 114 after the rotational speed is reduced through the second planetary row. When the clutch C1 is disengaged in conjunction with the brake B1, the power of the drive motor 101 is reduced in speed by the first planetary gear set and then output from the frame 108 to the sun gear 109 of the second planetary gear set. The second planet row becomes the whole rotation, realizes the high gear of transaxle.

In the embodiment, after the driving motor 101 converts the electric energy into the mechanical energy, the power is converted by the first and second planetary rows and enters the planetary differential. The planetary differential is implemented by a compound planet row without a ring gear. The compound planetary differential can realize 1: the output of the torque 1 meets the requirement that the vehicle outputs the same force through the left wheel and the right wheel on different road surfaces. The composite planetary differential can be locked through the differential lock 119, and the difficulty escaping requirement of the vehicle on a difficult road surface is met.

The driving motor has three working modes, namely an electric driving output mechanical energy, namely a D mode; absorbing mechanical energy to generate electric energy, namely R mode; neutral operation of the electric drive axle, referred to as N-mode, may be achieved by disengaging both clutch C1 and brake B1.

In the embodiment, the driving motor 101 can operate in D, R two modes, so that four operating states of motor drive and two-gear planetary reduction part are presented: low-speed driving, low-speed power generation, high-speed driving and high-speed power generation.

In the embodiment, for convenience of explaining different operating states of the two-gear centralized electric drive axle, the first planetary row, the second planetary row and the K value are exemplified as follows: 2.556, 2.556; the mechanical reduction ratio of the first planetary row and the second planetary row is 6.531 when the clutch C1 is combined with the brake B1 to brake the second planetary row; the initial condition is that the rotating speed of the motor is 0r/min to 8444r/min when the gear is low and the speed of the motor is corresponding to 0km/h to 65 km/h; then the high-gear state is switched, and the rotating speed of the motor is 4597r/min to 8488r/min, which corresponds to the vehicle speed from 65km/h to 120 km/h.

In the embodiment, in order to illustrate the working mode of the invention, the motor is decelerated and then adopts a planetary differential which is formed by a compound planetary structure of double sun gears and double planet gears, the number of teeth of a sun gear A115 of a planetary row of the differential is 51 teeth, and the number of teeth of a planet gear A116 of the differential is 17 teeth; the number of teeth of a sun gear B118 of a differential planet row on one side is 57 teeth, and the number of teeth of a differential planet gear B117 is 19 teeth; two planet wheels of the planet row differential, namely a differential planet wheel A116 and a differential planet wheel B117, are meshed with each other to form a coupling tooth of the compound planet row. The planetary differential mechanism formed in the way can be arranged side by side to reduce the axial space, and simultaneously, the condition that the wheels on two sides obtain the same driving torque when the differential lock is separated is met.

In the embodiment, the motor can be in a driving mode or a power generation mode under the same vehicle speed state according to the running requirement of the whole vehicle. Therefore, energy can be recovered during the deceleration or downhill process of the vehicle, the economy of the vehicle is improved, and on the other hand, the engine and the generator can be selectively operated in an economic area for the hybrid vehicle, so that the economy of the vehicle is further improved.

While the foregoing has expressed the principles of the invention, it is not limited to the embodiments illustrated. This application is intended to cover any variations, embodiments, or adaptations of the present principles, which are not specifically enumerated herein.