WO2023159917A1

WO2023159917A1 - Planetary-gear-set-type transmission and vehicle

Info

Publication number: WO2023159917A1
Application number: PCT/CN2022/118206
Authority: WO
Inventors: 姚文博; 赵玉婷; 邵文林; 章金乐; 施悠笛; 谭艳军; 林霄喆; 于海生; 王瑞平; 肖逸阁
Original assignee: 浙江吉利控股集团有限公司; 无锡星驱科技有限公司
Priority date: 2022-02-23
Filing date: 2022-09-09
Publication date: 2023-08-31
Also published as: CN114396467A

Abstract

Disclosed in the present invention is a planetary-gear-set type transmission and a vehicle. The planetary-gear-set type transmission comprises an electric motor, a first planetary gear set, a second planetary gear set, a left axle shaft and a right axle shaft, wherein the first planetary gear set comprises a first sun gear, a first planetary gear, a first ring gear and a first planetary carrier, the first sun gear being meshed with the first planetary gear, the first planetary gear being meshed with the first ring gear, and the first planetary gear being installed on the first planetary carrier; the second planetary gear set comprises a second sun gear, a second planetary gear, a second ring gear and a second planetary carrier, the second sun gear being meshed with the second planetary gear, the second planetary gear being meshed with the second ring gear, and the second planetary gear being installed on the second planetary carrier; the electric motor is in driving connection with the first sun gear by means of a rotor shaft; the first planetary carrier is in driving connection with the second ring gear; and the second planetary gear set is connected to the left axle shaft and the right axle shaft, so as to transmit power of the electric motor. The technical solution of the present invention provides a lightweight transmission.

Description

Planetary gearbox and vehicle

This application claims priority to a Chinese patent application with application number 202210171074.6 filed on February 23, 2022, the entire contents of which are incorporated herein by reference.

technical field

The present application relates to the technical field of vehicles, in particular to a planetary gear transmission and a vehicle.

Background technique

At present, with the development of the new energy vehicle industry, electric vehicles have become a development trend. With the increasing sales of electric vehicles, the lightweight development of electric vehicles is imperative.

In order to ensure the cruising range of the electric vehicle, a larger battery is generally equipped in the electric vehicle to meet the cruising demand. In this way, the weight reduction requirements for other components in electric vehicles are also getting higher and higher.

At present, most of the transmissions of electric vehicles adopt a parallel shaft layout, and at the same time use traditional bevel gear differentials for power output. However, this transmission has a problem of being heavy.

technical problem

The main purpose of this application is to provide a planetary gear transmission, aiming to provide a lightweight planetary gear transmission.

technical solution

In order to achieve the above purpose, the planetary gear transmission proposed by this application includes a motor, a first planetary row, a second planetary row, a left half shaft and a right half shaft;

The first planetary row includes a first sun gear, a first planetary gear, a first ring gear and a first planet carrier, the first sun gear meshes with the first planetary gear, and the first planetary gear meshes with the first planetary gear The first ring gear meshes, and the first planetary gear is mounted on the first planetary carrier;

The second planetary row includes a second sun gear, a second planetary gear, a second ring gear and a second planet carrier, the second sun gear meshes with the second planetary gear, and the second planetary gear meshes with the second planetary gear The second ring gear is meshed, and the second planetary gear is installed on the second planetary carrier;

The motor is in transmission connection with the first sun gear through a rotor shaft;

The first planet carrier is in transmission connection with the second ring gear;

The second planetary row is connected with the left half shaft and the right half shaft to transmit the power of the motor.

In one embodiment, the second sun gear is connected with the left half shaft, and the second planet carrier is connected with the right half shaft.

In one embodiment, the second sun gear is connected with the right half shaft, and the second planet carrier is connected with the left half shaft.

In one embodiment, the first ring gear is located on the outer side of the first planetary row away from the first sun gear, and is relatively fixed to the stationary part of the planetary row transmission.

In one embodiment, the first planetary gear includes first planetary gear one and first planetary gear two connected, the first planetary gear one meshes with the first sun gear, and the first planetary gear Two mesh with the first ring gear.

In one embodiment, the first planetary gear includes first planetary gear one and first planetary gear two connected, the first planetary gear one meshes with the first ring gear, and the first planetary gear Two mesh with the first sun gear.

In one embodiment, the first planetary gear includes first planetary gear 1 and first planetary gear 2 connected, and the first ring gear is sleeved on the outside of the rotor shaft and connected to the planetary row The casing of the transmission is relatively fixed, the first ring gear is in mesh with the first planetary gear, and the first sun gear is in mesh with the first planetary wheel two.

In one embodiment, the second planetary gear includes a second planetary gear 1 and a second planetary gear 2 that are meshed, and both the second planetary gear 1 and the second planetary gear 2 are installed on the second For the planet carrier, the second planetary gear 1 meshes with the second ring gear, and the second planetary gear 2 meshes with the second sun gear.

In one embodiment, the rotor shaft is a hollow shaft, and the left half shaft passes through the rotor shaft.

The present application also proposes a vehicle, including the planetary transmission.

Beneficial effect

The technical solution of the present application provides a connected first planetary row and a second planetary row in the planetary row transmission, and the power of the motor is transmitted to the left half shaft and the right half shaft through the first planetary row and the second planetary row. In this way, on the one hand, compared with the transmission structure using parallel shafts and bevel gears in the prior art, the number of parts required for the transmission is reduced, thereby reducing the overall weight of the planetary transmission and making the quality of the planetary transmission better. It is light, which in turn contributes to the weight reduction of the vehicle. On the other hand, compared with the transmission structure with parallel shafts and bevel gears in the prior art, the overall volume of the planetary transmission is reduced, the space occupied by the planetary transmission is reduced, and the structure of the planetary transmission is more compact. .

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to the structures shown in these drawings without creative effort.

Fig. 1 is the structural representation of an embodiment of the planetary gear transmission of the present application;

Fig. 2 is the structural representation of another embodiment of the planetary gear transmission of the present application;

Fig. 3 is a schematic structural view of another embodiment of the planetary gear transmission of the present application;

Fig. 4 is a schematic structural diagram of another embodiment of the planetary transmission of the present application.

Explanation of reference numbers:

标号 label	名称 name	标号 label	名称 name
10 10	电机 motor	130 130	第一齿圈 first ring gear
11 11	转子轴 rotor shaft	140 140	第一行星架 first planetary carrier
20 20	左半轴 left axis	200 200	第二行星排 second planet row
30 30	右半轴 right axis	210 210	第二太阳轮 second sun gear
100 100	第一行星排 first planet row	220 220	第二行星轮 second planetary wheel
110 110	第一太阳轮 first sun wheel	221 221	第二行星轮一 second planetary gear
120 120	第一行星轮 first planetary wheel	222 222	第二行星轮二 second planetary wheel two
121 121	第一行星轮一 first planetary one	230 230	第二齿圈 second ring gear
122 122	第一行星轮二 1st planetary wheel 2	240 240	第二行星架 second planet carrier

The realization, functional features and advantages of the present application will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Embodiments of the present invention

The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present application are only used to explain the relationship between the components in a certain posture (as shown in the figure). Relative positional relationship, movement conditions, etc., if the specific posture changes, the directional indication will also change accordingly.

In addition, the descriptions involving "first", "second" and so on in the present application are only for the purpose of description, and should not be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, "and/or" in the full text includes three solutions, taking A and/or B as an example, including A technical solution, B technical solution, and a technical solution that A and B satisfy at the same time; in addition, between the various embodiments The technical solutions can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, and it is not required by this application. within the scope of protection.

In view of this, the present application proposes a planetary gear transmission.

Please refer to FIGS. 1 to 4 , in the embodiment of the present application, the planetary transmission includes a motor 10 , a first planetary row 100 , a second planetary row 200 , a left half shaft 20 and a right half shaft 30 .

The first planet row 100 includes a first sun gear 110, a first planet gear 120, a first ring gear 130 and a first planet carrier 140, the first sun gear 110 meshes with the first planet gear 120, the first planet gear 120 meshes with the first A ring gear 130 meshes, and the first planetary gear 120 is mounted on the first planetary carrier 140 . Specifically, the first sun gear 110 is located at the center of the first planetary row 100, the first planetary gear 120 meshes with the outer ring of the first sun gear 110, and in the circumferential direction of the first sun gear 110, the first planetary gear There can be multiple sets of 120, and there is no limit to the number of sets of the first planetary gear 120 here. The first planetary gear 120 is fixed on the first planetary frame 140 , and the first planetary frame 140 provides fixed support for the first planetary wheel 120 . At the same time, the first planetary gear 120 is also meshed with the inner ring of the first ring gear 130, that is, the first planetary gear 120 is in a state of constant meshing with the adjacent first sun gear 110 and the first ring gear 130, thereby realizing three transmission between.

The second planetary row 200 includes a second sun gear 210, a second planetary gear 220, a second ring gear 230 and a second planet carrier 240, the second sun gear 210 meshes with the second planetary gear 220, the second planetary gear 220 meshes with the second planetary gear 220 The second ring gear 230 is meshed, and the second planetary gear 220 is mounted on the second planetary carrier 240 . Specifically, the second sun gear 210 is located at the center of the second planetary row 200, the second planetary gear 220 meshes with the outer ring of the second sun gear 210, and in the circumferential direction of the second sun gear 210, the second planetary gear There can be multiple sets of 220, and the number of sets of the second planetary gear 220 is not limited here. The second planetary gear 220 is fixed on the second planetary carrier 240 , and the second planetary carrier 240 provides fixed support for the second planetary wheel 220 . At the same time, the second planetary gear 220 is also meshed with the inner ring of the second ring gear 230, that is, the second planetary gear 220 is in a constant mesh state with the adjacent second sun gear 210 and the second ring gear 230, thereby realizing three transmission between.

The motor 10 is in transmission connection with the first sun gear 110 through the rotor shaft 11 . Specifically, the motor 10 is the power source of the planetary transmission, and the power of the motor 10 is transmitted to the planetary transmission through the rotor shaft 11 . The motor 10 is connected to the first sun gear 110 of the first planetary row 100 . In one embodiment, the rotor shaft 11 of the motor 10 is directly splined or optically pressed or integrally connected to the first sun gear 110 . Of course, the rotor shaft 11 of the motor 10 may also be spline-connected to the high-speed shaft, and the high-speed shaft is then spline-fitted or integrally connected to the first sun gear 110 or the optical shaft. The connection between the motor 10 and the first sun gear 110 realizes the transmission of the power of the motor 10 to the first planetary row 100 .

The first planet carrier 140 is in transmission connection with the second ring gear 230 . Specifically, the transmission connection between the first planetary row 100 and the second planetary row 200 is realized through the first planetary carrier 140 and the second ring gear 230 , so that the power of the motor 10 can be transmitted to the second planetary row through the first planetary row 100 Row 200.

The second planetary row 200 is connected with the left half shaft 20 and the right half shaft 30 to transmit the power of the motor 10 . Specifically, the half shafts are used to transmit power between the planetary differential and the drive wheels. The left half shaft 20 is used to transmit the power of the motor 10 to the left wheel of the vehicle, and the right half shaft 30 is used to transmit the power of the motor 10 to the right wheel of the vehicle. That is, the left half shaft 20 and the right half shaft 30 are power output shafts of the planetary transmission. Both the left half shaft 20 and the right half shaft 30 are connected to the second planetary row 200, and the power of the motor 10 is transmitted to the left half shaft 20 and the right half shaft 30 through the first planetary row 100 and the second planetary row 200, thereby realizing the vehicle wheel drive.

In this way, by setting the connected first planetary row 100 and second planetary row 200 in the planetary row transmission, on the one hand, compared with the transmission structure using parallel shafts and bevel gears in the prior art, the planetary row transmission The reduction in the overall weight makes the weight of the planetary gear transmission lighter, which in turn is beneficial to the weight reduction of the vehicle. On the other hand, compared with the transmission structure with parallel shafts and bevel gears in the prior art, the overall volume of the planetary transmission is reduced, the space occupied by the planetary transmission is reduced, and the structure of the planetary transmission is more compact. .

The technical solution of the present application sets the connected first planetary row 100 and the second planetary row 200 in the planetary row transmission, and the power of the motor 10 is transmitted to the left half shaft 20 and the left half shaft 20 through the first planetary row 100 and the second planetary row 200 Right half shaft 30. In this way, on the one hand, compared with the transmission structure using parallel shafts and bevel gears in the prior art, the number of parts required for the transmission is reduced, thereby reducing the overall weight of the planetary transmission and making the quality of the planetary transmission better. It is light, which in turn contributes to the weight reduction of the vehicle. On the other hand, compared with the transmission structure with parallel shafts and bevel gears in the prior art, the overall volume of the planetary transmission is reduced, the space occupied by the planetary transmission is reduced, and the structure of the planetary transmission is more compact. .

In one embodiment, the second sun gear 210 is connected with the left half shaft 20 , and the second planet carrier 240 is connected with the right half shaft 30 . Specifically, the second sun gear 210 is connected with the left half shaft 20, that is, the power of the motor 10 is transmitted to the left half shaft 20 through the second sun gear 210, and then drives the left side wheel; the second planet carrier 240 is connected with the right half shaft 30 Connection, that is, the power of the motor 10 is transmitted to the right half shaft 30 through the second planetary carrier 240 , and then drives the right wheel. In this way, through the second sun gear 210 and the second planet carrier 240 being connected to the left half shaft 20 and the right half shaft 30 respectively, the second planetary row 200 realizes the function of a differential. On the one hand, through the combination of the second row of planetary gears, the output speed ratios at both ends of the left half shaft 20 and the right half shaft 30 are equal; drive.

In one embodiment, the second sun gear 210 is connected with the right half shaft 30 , and the second planet carrier 240 is connected with the left half shaft 20 . Specifically, the second sun gear 210 is connected with the right half shaft 30, that is, the power of the motor 10 is transmitted to the right half shaft 30 through the second sun gear 210, and then drives the right side wheel; the second planet carrier 240 is connected with the left half shaft 20 Connection, that is, the power of the motor 10 is transmitted to the left axle shaft 20 through the second planetary carrier 240 , and then drives the left wheel. In this way, through the second sun gear 210 and the second planet carrier 240 being connected to the right half shaft 30 and the left half shaft 20 respectively, the second planetary row 200 realizes the function of a differential. On the one hand, through the combination of the second row of planetary gears, the output speed ratios at both ends of the left half shaft 20 and the right half shaft 30 are equal; drive.

In one embodiment, the first ring gear 130 is located on the outer side of the first planetary row 100 away from the first sun gear 110 , and is relatively fixed to the stationary part of the planetary row transmission. Specifically, the first sun gear 110 is located in the middle of the first planetary row 100 , and along the radial direction of the first sun gear 110 , the first ring gear 130 is located on the outer side of the first planetary row 100 away from the first sun gear 110 . That is to say, along the radial direction of the first sun gear 110 , the first sun gear 110 , the first planetary gear 120 , and the first ring gear 130 mesh in pairs in sequence, so as to realize the transmission among the three. At the same time, the first ring gear 130 is a braking member, and the first ring gear 130 is relatively fixedly connected with the stationary part of the planetary gear transmission. The stationary part of the planetary transmission refers to the stationary parts in the planetary transmission, such as the casing of the planetary transmission, the motor stator, the brake hub and other stationary parts. More specifically, the connection between the first ring gear 130 and the housing of the planetary gear transmission may be through a spline, or through rectangular teeth.

In one embodiment, the first planetary gear 120 includes a first planetary gear 121 and a first planetary gear two 122 connected, the first planetary gear 121 is meshed with the first sun gear 110, and the first planetary gear two 122 is meshed with the first sun gear 110. The first ring gear 130 meshes. Specifically, the first planetary row 100 is an NW type planetary gear structure. The first planetary gear 120 is fixed on the first planet carrier 140 through the first planetary gear shaft, the first planetary gear shaft is perpendicular to the circumferential direction of the first sun gear 110, and the first planetary gear 121 and the first planetary gear 121 are installed on the first planetary gear shaft. The second planetary gear 122, the first planetary gear 121 and the first planetary gear 2 122 can be shrink fit, splined, or integrated into a double planetary gear. The first planetary gear 122 is located on the side of the first planetary gear 121 away from the motor 10 , the first planetary gear 121 is meshed with the first sun gear 110 , and the first planetary gear 2 122 is meshed with the first ring gear 130 . In this way, the power of the motor 10 is sequentially transmitted to the second planetary row 200 through the first sun gear 110, the first planetary gear 121, the first planetary gear 2 122, and the first planet carrier 140, thereby realizing the power of the motor 10 at the second planetary row 200. A planet within row 100 passes. In this way, the deceleration function of the planetary transmission is realized through the arrangement of the first planetary row 100 , and the power of the motor 10 can realize the function of reducing speed and increasing torque after being transmitted by the first planetary row 100 . The setting of the connected first planetary gear 121 and first planetary gear 2 122 improves the speed ratio of the planetary gear transmission and expands the speed ratio range, so that it can carry a wider range of rotation speeds of the motor 10, thereby satisfying different design requirements.

In one embodiment, the first planetary gear 120 includes a first planetary gear 121 and a first planetary gear 2 122 connected, the first planetary gear 121 meshes with the first ring gear 130, and the first planetary gear 2 122 meshes with the first ring gear 130 The first sun gear 110 is engaged. Specifically, the first planetary row 100 is an NW type planetary gear structure. The first planetary gear 120 is fixed on the first planet carrier 140 through the first planetary gear shaft, the first planetary gear shaft is perpendicular to the circumferential direction of the first sun gear 110, and the first planetary gear 121 and the first planetary gear 121 are installed on the first planetary gear shaft. A planetary wheel two 122, the first planetary wheel one 121 and the first planetary wheel two 122 are fitted into a double planetary wheel through shrink fit, splines, or integral cooperation. The first planetary gear 122 is located on the side of the first planetary gear 121 away from the motor 10 , the first planetary gear 121 is meshed with the first ring gear 130 , and the first planetary gear 2 122 is meshed with the first sun gear 110 . In this way, the power of the motor 10 is sequentially transmitted to the second planetary row 200 through the first sun gear 110, the first planetary gear 122, and the first planetary carrier 140, thereby realizing the transmission of the power of the motor 10 in the first planetary row 100 . In this way, the deceleration function of the planetary transmission is realized through the arrangement of the first planetary row 100 , and the power of the motor 10 can realize the function of reducing speed and increasing torque after being transmitted by the first planetary row 100 . The setting of the first planetary row 100 improves the speed ratio of the planetary-row transmission and expands the range of the speed ratio, so that it can carry a wider speed range of the motor 10, thereby meeting different design requirements.

In one embodiment, the first planetary gear 120 includes first planetary gear one 121 and first planetary gear two 122 connected, and the first ring gear 130 is sleeved on the outside of the rotor shaft 11 and connected to the shell of the planetary gear transmission. The bodies are relatively fixed, the first ring gear 130 meshes with the first planetary gear 121 , and the first sun gear 110 meshes with the first planetary gear 2 122 . Specifically, the first planetary row 100 is an NW type planetary gear structure. The first planetary gear 120 is fixed on the first planet carrier 140 through the first planetary gear shaft, the first planetary gear shaft is perpendicular to the circumferential direction of the first sun gear 110, and the first planetary gear 121 and the first planetary gear 121 are installed on the first planetary gear shaft. A planetary wheel 2 122, the first planetary wheel 121 and the first planetary wheel 122 are press-fitted, splined, or integrated to form a double planetary wheel, and the first planetary wheel 122 is located on the first planetary wheel 1 121 is away from the side of the motor 10 . The first ring gear 130 is mounted on the outside of the rotor shaft 11 through a needle bearing and is capable of rotating axially on the rotor shaft 11 . That is, in the axial direction of the rotor shaft 11, the first ring gear 130 is located between the motor 10 and the first sun gear 110, the first ring gear 130 meshes with the first planetary gear 121, and the first ring gear 130 and The housing of the planetary row transmission is relatively fixed. The first ring gear 130 may be connected to the housing of the planetary gear transmission through splines or rectangular teeth.

In one embodiment, the second planetary gear 220 includes a meshing second planetary gear 1 221 and a second planetary gear 2 222 , and both the second planetary gear 1 221 and the second planetary gear 2 222 are mounted on the second planet carrier 240 , the second planetary gear 1 221 meshes with the second ring gear 230 , and the second planetary gear 222 meshes with the second sun gear 210 . Specifically, the second planet wheel 220 is fixed to the second planet carrier 240 through the second planet wheel shaft, and the second planet wheel shaft is fixed to the second planet carrier 240 . The second planetary gear 1 221 and the second planetary gear 2 222 are mounted on the second planetary carrier 240 through their respective second planetary gear shafts. The second planetary gear 1 221 and the second planetary gear 222 are in a constant mesh state. After the power of the motor 10 is transmitted to the second ring gear 230 through the first planetary row 100, it is transmitted to the second planetary gear 1 221 and the second planetary gear in turn. Two 222, the second sun gear 210 transfers. The left half shaft 20 and the right half shaft 30 of the vehicle are respectively connected with the second sun gear 210 and the second planet carrier 240, or the left half shaft 20 and the right half shaft 30 are respectively connected with the second planet carrier 240 and the second sun gear 210 , so as to realize the transmission of the power of the motor 10 to the wheels. The second planetary gear 220 includes a second planetary gear one 221 and a second planetary gear two 222, so that under the differential speed condition, the side with a high speed can obtain a higher torque, and the side with a low speed can obtain a lower torque. Torque, so as to meet the needs of the differential. On the other hand, the structure of the second planetary row 200 is made more compact, thereby making the overall structure of the planetary row transmission more compact.

In one embodiment, the rotor shaft 11 is a hollow shaft, and the left half shaft 20 passes through the rotor shaft 11 . Specifically, the rotor shaft 11 of the motor 10 is a hollow shaft, and the left half shaft 20 passes through the hollow center of the rotor shaft 11 and can rotate freely relative to the rotor shaft 11, thereby transmitting power to the left wheel. In this way, the overall structure of the planetary gear transmission is more compact.

The motor 10 is the power source of the planetary gear transmission, and is used to provide power to the planetary gear transmission. More specifically, the motor 10 includes a stator and a rotor, and the rotor outputs torque to the planetary gear transmission through the rotor shaft 11 . The torque of the motor 10 is transmitted to the second planetary row 200 through the first planetary row 100. Under the action of the torque of the motor 10, the second planetary row 200 rotates, and then drives the left half shaft 20 and the right half shaft 30 to rotate, and then drives the left side of the vehicle. wheel and right wheel. In this way, deceleration is realized through the first planetary row 100 , and differential speed is realized through the second planetary row 200 , so as to meet the speed requirement of the vehicle wheel end.

In one embodiment, the second sun gear 210 is connected to the left half shaft 20, and the second planet carrier 240 is connected to the right half shaft 30, wherein the second planetary gear 220 includes a second planetary gear 1 221 and a second planetary gear 221 meshing with each other. Round two 222 . At this time, the torque transmission path of the left half shaft 20 is: motor 10-first sun gear 110-first planetary gear 120-first planetary carrier 140-second ring gear 230-second planetary gear one 221-second planetary gear Two 222—the second sun gear 210—the left half shaft 20. The torque transmission path of the right half shaft 30 is: motor 10-first sun gear 110-first planetary gear 120-first planetary carrier 140-second ring gear 230-second planetary gear one 221-second planetary carrier 240- Right half shaft 30.

When the vehicle is going straight, the left and right wheels need to have the same speed and torque. The torque of the motor 10 is transmitted to the second planetary row 200 after being decelerated and increased by the first planetary row 100, so that the rotation speed of the second planetary carrier 240 is the same as that of the second sun gear 210, so that the right half shaft 30 and the left half shaft 20 outputs the same speed and torque.

When the output speed on the left side of the vehicle is high, the speed and torque of the left wheel are higher than the speed and torque of the right wheel. When the vehicle turns right, the rotation speed of the left wheel is higher than that of the right wheel. After being transmitted by the left half shaft 20 and the right half shaft 30, a larger speed is transmitted to the second sun gear 210, and then to the second planet carrier. 240 transmits a small rotational speed, at this time, through the gear ratio of the second ring gear 230 and the second sun gear 210, the rising speed of the second sun gear 210 is equal to the falling speed of the second planet carrier 240, so that the left The half shaft 20 outputs higher rotational speed and larger torque, so that the right half shaft 30 outputs lower rotational speed and smaller torque.

When the output speed on the right side of the vehicle is high, the speed and torque of the right wheel are higher than the speed and torque of the left wheel. When the vehicle turns left, the rotation speed of the right wheel is higher than the rotation speed of the left wheel. After being transmitted by the left half shaft 20 and the right half shaft 30, a smaller speed is transferred to the second sun gear 210, and then to the second planet carrier. 240 transmits a relatively large rotational speed. At this time, through the ratio of the number of teeth of the second ring gear 230 and the second sun gear 210, the speed at which the second sun gear 210 descends is equal to the speed at which the second planetary carrier 240 ascends, so that the left The half shaft 20 outputs a lower rotational speed and a smaller torque, so that the right half shaft 30 outputs a higher rotational speed and a greater torque.

In another embodiment, the second sun gear 210 is connected to the right half shaft 30, and the second planet carrier 240 is connected to the left half shaft 20, wherein the second planetary gear 220 includes a second planetary gear 1 221 and a second planetary gear 221 meshed with each other. Planetary two 222. At this time, the torque transmission path of the left half shaft 20 is: motor 10-first sun gear 110-first planetary gear 120-first planetary carrier 140-second ring gear 230-second planetary gear one 221-second planetary carrier 240 - left half shaft 20. The torque transmission path of the right half shaft 30 is: motor 10 - first sun gear 110 - first planetary gear 120 - first planet carrier 140 - second ring gear 230 - second planetary gear one 221 - second planetary gear two 222 - second sun gear 210 - right half shaft 30 . The specific principle of the differential speed is the same as above, and will not be repeated here.

The present application also proposes a vehicle, which includes a planetary transmission. For the specific structure of the planetary transmission, refer to the above-mentioned embodiments. Since this vehicle adopts all the technical solutions of all the above-mentioned embodiments, it has at least the features of the above-mentioned embodiments. All beneficial effects brought by the technical solution will not be repeated here.

In this way, the planetary row transmission realizes the speed change function through the first planetary row 100, and realizes the differential speed function through the second planetary row 200, thereby reducing the volume and mass of the transmission components, and greatly improving the power density of the planetary row transmission . Through the setting of the first planetary row 100 and the second planetary row 200, a wider speed ratio range can be realized, so that the rotation speed range of the motor 10 that the planetary row transmission can carry is wider, so as to meet different design requirements and further expand the application of vehicles scope. At the same time, it also makes the axial structure of the planetary transmission more compact, making the overall weight of the planetary transmission lighter, which is beneficial to the weight reduction of the vehicle.

The above are only optional embodiments of the application, and are not intended to limit the patent scope of the application. Under the application concept of the application, the equivalent structural transformation made by using the description of the application and the contents of the accompanying drawings, or direct/indirect Applications in other relevant technical fields are included in the patent protection scope of the present application.

Claims

A planetary gear transmission, including a motor, a first planetary row, a second planetary row, a left half shaft and a right half shaft;

The first planetary row includes a first sun gear, a first planetary gear, a first ring gear and a first planet carrier, the first sun gear meshes with the first planetary gear, and the first planetary gear meshes with the first planetary gear The first ring gear meshes, and the first planetary gear is mounted on the first planetary carrier;

The second planetary row includes a second sun gear, a second planetary gear, a second ring gear and a second planet carrier, the second sun gear meshes with the second planetary gear, and the second planetary gear meshes with the second planetary gear The second ring gear is meshed, and the second planetary gear is installed on the second planetary carrier;

The motor is in transmission connection with the first sun gear through a rotor shaft;

The first planet carrier is in transmission connection with the second ring gear;

The second planetary row is connected with the left half shaft and the right half shaft to transmit the power of the motor.
The planetary gear transmission according to claim 1, wherein the second sun gear is connected with the left half shaft, and the second planet carrier is connected with the right half shaft.
The planetary gear transmission according to claim 1, wherein the second sun gear is connected with the right half shaft, and the second planet carrier is connected with the left half shaft.
The planetary gear transmission according to claim 1, wherein the first ring gear is located on the outer side of the first planetary row away from the first sun gear, and is relatively fixed to the stationary part of the planetary gear transmission .
The planetary gear transmission according to claim 4, wherein said first planetary gear comprises first planetary gear one and first planetary gear two connected, said first planetary gear one and said first sun gear meshing, the first planetary gear two meshes with the first ring gear.
The planetary gear transmission according to claim 4, wherein said first planetary gear comprises first planetary gear one and first planetary gear two connected, said first planetary gear one and said first ring gear meshing, the first planetary gear two meshes with the first sun gear.
The planetary gear transmission according to claim 1, wherein the first planetary gear includes first planetary gear one and first planetary gear two connected, and the first ring gear is loosely sleeved on the rotor shaft The outer part is relatively fixed to the casing of the planetary gear transmission, the first ring gear meshes with the first planetary gear one, and the first sun gear meshes with the first planetary gear two.
The planetary gear transmission as claimed in claim 1, wherein said second planetary gear comprises second planetary gear one and second planetary gear two meshed, said second planetary gear one and said second planetary gear Both are mounted on the second planet carrier, the second planetary gear 1 meshes with the second ring gear, and the second planetary gear 2 meshes with the second sun gear.
The planetary gear transmission according to any one of claims 1 to 8, wherein the rotor shaft is a hollow shaft, and the left half shaft passes through the rotor shaft.
A vehicle, comprising the planetary transmission according to any one of claims 1 to 9.