Disclosure of Invention
In order to solve at least one of the technical problems, the application provides a transmission system which is small in size and light in weight, solves the problems of large size and large weight of the traditional transmission system, and an electric driving assembly formed by assembling the transmission system and a motor has differential speed and speed change functions.
The present application further provides a vehicle.
The transmission system provided by the embodiment of the invention comprises: the planetary transmission mechanism is provided with an input part and two output parts, the input part is arranged to be in transmission connection with the motor, and the two output parts are both arranged to be in transmission connection with the wheels; wherein the transmission system has a straight-driving mode of operation and a turning mode of operation; in the straight-moving working mode, the rotating speeds output by the two output parts are the same; under the turning working mode, the change rates of the rotating speeds output by the two output parts are mutually opposite numbers.
In an exemplary embodiment, the planetary transmission mechanism includes: a simple planetary row with a sun gear, a first planet carrier and a first ring gear, the input being located on the sun gear and the output being located on the first planet carrier; the second gear ring is fixedly arranged and is positioned on one side of the simple planet row; the second planet gear is meshed with the second gear ring; a third gear ring positioned at one side of the second gear ring, and the other output part is positioned on the third gear ring; the third planet wheel is fixedly connected with the second planet wheel and meshed with the third gear ring; and one end of the second planet carrier is fixedly connected with the first gear ring, and the other end of the second planet carrier is in transmission connection with the second planet gear.
In an exemplary embodiment, the second gear ring is located between the first gear ring and the third gear ring.
In an exemplary embodiment, the transmission ratio i is 1+ i 1 /[1-(i 2 /i 3 )]And satisfy i 1 *i 2 =(i 1 *i 3 -i 2 +i 3 ) 2; wherein i 1 =Z R1 /Z S1 ,i 2 =Z P2 /Z R2 ,i 3 =Z P3 /Z R3 The sun gear is represented by S1, the first ring gear is represented by R1, the second planet gear is represented by P2, the second ring gear is represented by R2, the third planet gear is represented by P3, the third ring gear is represented by R3, and Z represents the number of teeth.
In an exemplary embodiment, the output portion at the first carrier extends through the sun gear.
In an exemplary embodiment, the first carrier and the third ring gear are located between the two output portions.
In an exemplary embodiment, the second gear ring is an outer gear ring or an inner gear ring, and the third gear ring is an outer gear ring or an inner gear ring.
In an exemplary embodiment, the second planet wheel and the third planet wheel are a double planet wheel of an integrated structure.
The electric drive assembly provided by the embodiment of the invention comprises a motor and the transmission system of any one of the embodiments, wherein the motor is in transmission connection with the input part.
The vehicle provided by the embodiment of the invention comprises wheels and the transmission system of any embodiment, wherein the wheels are in transmission connection with the output part.
In an exemplary embodiment, the vehicle is an electric vehicle.
The transmission system is applied to vehicles, and in a straight-going working mode, the rotating speeds output by the two output parts are the same, so that the rotating speed requirements of wheels on two sides of the vehicles in straight-going are met; under the turning working mode, the change rates of the rotating speeds output by the two output parts are opposite numbers, so that the differential function is realized, and the rotating speed requirements of the wheels at two sides of the vehicle during turning are met; in addition, the speed change function is realized by changing the rotating speed of the input part; moreover, the planetary transmission mechanism has the advantages of small size, light weight and the like, and the electric drive assembly assembled by the planetary transmission mechanism and the motor has integrated design on a speed reduction structure and a differential structure, and has the advantages of compact structure, high transmission efficiency, large transmission ratio and the like.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. Other advantages of the present application can be realized and attained by the instrumentalities and combinations particularly pointed out in the specification and the drawings.
Detailed Description
The present embodiments are described herein, but are by way of illustration rather than limitation, and the objects, aspects and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings. In the case of no conflict, the present application shall be defined
The embodiments and features of the embodiments can be combined with each other in any desired manner.
Embodiments of the present invention provide a vehicle (not shown) including a wheel and an electric drive assembly. As shown in fig. 1, an electric drive assembly includes an electric machine 100 and a drive train. The transmission system includes: the planetary transmission mechanism is provided with an input part 211 and two output parts, wherein the input part 211 is in transmission connection with the motor 100, and the two output parts are in transmission connection with a group of wheels correspondingly; the transmission system has a straight running working mode and a turning working mode; under the straight-ahead working mode, the rotating speeds output by the two output parts are the same; in the turning working mode, the change rates of the rotating speeds output by the two output parts are opposite numbers, namely the output rotating speed of one output part is increased, and the output rotating speed of the other output part is decreased.
In the vehicle, under the straight-ahead operation mode, the rotating speeds output by the two output parts are the same, so that the rotating speed requirements of wheels on two sides of the vehicle in straight-ahead operation are met; under the turning working mode, the change rates of the rotating speeds output by the two output parts are opposite numbers, so that the differential function is realized, and the rotating speed requirements of the wheels at two sides of the vehicle during turning are met; in addition, by changing the rotation speed of the input portion 211, a speed change function is realized; moreover, the planetary transmission mechanism has the advantages of small size, light weight and the like, and the electric drive assembly assembled by the planetary transmission mechanism and the motor 100 integrates the speed reduction structure and the differential structure, so that the planetary transmission mechanism has the advantages of compact structure, high transmission efficiency, large transmission ratio and the like.
In an exemplary embodiment, as shown in fig. 1, the planetary gear mechanism includes: a simple planetary row with a sun gear 210, a first planet gear 220, a first carrier 230 and a first ring gear 240, the input 211 being located on the sun gear 210, and an output (i.e. a first output 231) being located on the first carrier 230; a second fixed gear ring 250 (e.g., the second gear ring 250 is fixed to a stationary member such as a housing) positioned on one side of the simple planetary row; a second planetary gear 260 meshed with the second ring gear 250; a third ring gear 270 located on a side of the second ring gear 250 facing away from the first ring gear 240 (i.e., the second ring gear 250 is located between the first ring gear 240 and the third ring gear 270), another output portion (i.e., the second output portion 271) is located on the third ring gear 270 (i.e., the third ring gear 270 has a bottom wall, and the second output portion 271 is located on a side of the bottom wall facing away from the sun gear 210 and is fixedly connected to the bottom wall), and the first carrier 230 and the third ring gear 270 are located between the two output portions; a third planet gear 280 fixedly connected with the second planet gear 260 and meshed with the third gear ring 270; and a second planet carrier 290, one end of which is fixedly connected with the first gear ring 240 and the other end of which is in transmission connection with the second planet gear 260.
The input portion 211 drives the sun gear 210 to rotate. The sun gear 210 drives the first planet gear 220 to rotate, the first planet gear 220 drives the first ring gear 240 to rotate, the first planet gear 220 also drives the first planet carrier 230 to rotate, and the first planet carrier 230 drives the first output part 231 to rotate together for power output. The first gear ring 240 drives the second planet carrier 290 to rotate, the second planet carrier 290 drives the second planet gear 260 and the third planet gear 280 to rotate together, the second gear ring 250 is fixed, the third planet gear 280 drives the third gear ring 270 to rotate, and the third gear ring 270 drives the second output part 271 to rotate together to output power.
In the planetary gear train, the sun gear 210 is denoted as S1, the first ring gear 240 is denoted as R1, the second planet gears 260 are denoted as P2, the second ring gear 250 is denoted as R2, the third planet gears 280 are denoted as P3, the third ring gear 270 is denoted as R3, C1 represents the rotation speed of the first carrier 230, C2 represents the rotation speed of the second carrier 290, and Z represents the number of teeth. Transmission ratio i of transmission system is 1+ i 1 /[1-(i 2 /i 3 )]And satisfy i 1 *i 2 =(i 1 *i 3 -i 2 +i 3 ) 2; wherein i 1 =Z R1 /Z S1 ,i 2 =Z P2 /Z R2 ,i 3 =Z P3 /Z R3 。i 1 Is the gear ratio of the first ring gear 240 to the sun gear 210, i 2 Is the gear ratio, i, of the second planet gear 260 to the second annulus 250 3 The gear ratio of the third planetary gear 280 to the third ring gear 270. In fig. 2 to 4, a is a curve of the rotation speed in the right-turn operation mode, b is a curve of the rotation speed in the left-turn operation mode, and c is a curve of the rotation speed in the straight-line operation mode.
As shown in fig. 2, in the direct driving operation mode, the motor 100 inputs power to the sun gear 210, and the first output part 231 and the second output part 271 output the same rotation speed, so as to ensure the same rotation speed of the wheels on both sides and achieve the same rotation speed and torque output. As shown in fig. 3, in the right-hand turning operation mode, the right-hand wheels (which rotate faster than the left-hand wheels) drive the rotation speeds of the second output portion 271 and the third ring gear 270 to increase by a set value, the rotation speeds of the second planet carrier 290 and the first ring gear 240 increase by a corresponding value, and the rotation speeds of the first planet carrier 230 and the first output portion 231 decrease by a set value (i.e., the increased rotation speed value of the second output portion 271 is equal to the decreased rotation speed value of the first output portion 231), so as to realize the differential function. As shown in fig. 4, in the left-hand turning operation mode, the left-hand wheels (which rotate faster than the right-hand wheels) drive the first carrier 230 and the first output portion 231 to increase by a set value, the rotation speeds of the second carrier 290 and the first ring gear 240 decrease by a corresponding value, and the rotation speeds of the second output portion 271 and the third ring gear 270 decrease by a set value (i.e., the increased rotation speed value of the first output portion 231 is equal to the decreased rotation speed value of the second output portion 271), so as to realize the differential function. The speed change function is realized by changing the output rotation speed of the motor 100.
In one example, as shown in fig. 1, the first carrier 230 is partially located on a side of the first planetary gear 220 facing the second ring gear 250 (i.e., the first carrier 230 is partially located on a right side of the first planetary gear 220, and is located at the first output portion 231 and passes through the sun gear 210), and the electric machine 100 is a ring-shaped electric machine 100. The input part 211 is a hollow shaft, and the first output part 231 penetrates through the input part 211 and the motor 100 leftwards and then is fixedly connected with the wheels, so that the planetary transmission mechanism can be arranged to be located in the same shell, only one set of forced lubrication system needs to be equipped at the moment, and the structure is simpler and more reasonable.
It may be that, as shown in fig. 1, the second gear ring 250 is an outer gear ring; alternatively, the second ring gear 250 may be a ring gear; it may be that, as shown in fig. 1, the third ring gear 270 is an outer ring gear; alternatively, the third gear 270 may be an inner gear; the objectives of the present application can be achieved without departing from the design concept of the present invention, and therefore, the present application shall not be repeated herein and shall fall within the protection scope of the present application.
As shown in fig. 1, the second planet gear 260 and the third planet gear 280 may be a duplex planet gear 300 of an integrated structure; or the second planet gear 260 and the third planet gear 280 may be separate structures and fixedly connected by a spline or the like; the above objectives can be achieved without departing from the design concept of the present invention, and therefore, the details are not repeated herein and all of the objectives should fall within the protection scope of the present application.
In one example, the vehicle is an electric vehicle, and the electric vehicle is a pure electric vehicle.
In summary, the transmission system provided by the application is applied to a vehicle, and in a straight-ahead operation mode, the rotating speeds output by the two output parts are the same, so that the rotating speed requirements of wheels on two sides of the vehicle when the vehicle runs straight are met; in a turning working mode, the change rates of the rotating speeds output by the two output parts are opposite numbers, so that a differential function is realized, and the rotating speed requirements of wheels at two sides during turning of the vehicle are met; in addition, the speed change function is realized by changing the rotating speed of the input part; moreover, the planetary transmission mechanism has the advantages of small size, light weight and the like, and the electric drive assembly assembled by the planetary transmission mechanism and the motor has integrated design on a speed reduction structure and a differential structure, and has the advantages of compact structure, high transmission efficiency, large transmission ratio and the like.
In the description of the present invention, it should be noted that the terms "upper", "lower", "one side", "the other side", "one end", "the other end", "side", "opposite", "four corners", "periphery", "mouth" structure ", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the structures referred to have specific orientations, are configured and operated in specific orientations, and thus, are not to be construed as limiting the present invention.
In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "connected," "directly connected," "indirectly connected," "fixedly connected," "mounted," and "mounted" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; the terms "mounted," "connected," and "fixedly connected" may refer to a direct connection, an indirect connection through intervening media, and a connection between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.