Two-gear driving device

Abstract

According to the two-gear driving device, a gear switching mechanism is connected with a motor, when the gear switching mechanism is located at a first position, the gear switching mechanism is connected with a sun gear, and a planet carrier is connected with the sun gear based on a duplex-tooth planet gear; driving force provided by the motor is transmitted to the planet carrier through the gear switching mechanism, the sun gear and the duplex-tooth planet gear in sequence. And when the gear switching mechanism is located at the second position, the gear switching mechanism is connected with the planet carrier, the planet carrier is disconnected with the duplex-tooth planet wheel, and the driving force provided by the motor is transmitted to the planet carrier through the gear switching mechanism. Therefore, when the gear switching mechanism is located at different positions, the connection relations between the components are different, so that the transmission path of the driving force is changed, and different requirements are met. And in the second position, the planet carrier is disconnected with the duplex-tooth planet wheel, so that when driving force is transmitted to the planet carrier, the duplex-tooth planet wheel and the sun wheel cannot be driven, decoupling of transmission components is achieved, energy loss is avoided, and the transmission efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to a two-speed drive device. Background Technology

[0002] With advancements in vehicle and energy technologies, pure electric vehicles have experienced rapid development, such as pure electric cars.

[0003] In related technologies, the pure electric drive system can switch between two gears, one with a high speed ratio and the other with a low speed ratio, thereby meeting the vehicle's different speed requirements under various driving conditions. In practical applications, regardless of the gear, the pure electric drive system used in these technologies is based on gear shaft transmission to output the driving force provided by the motor to the vehicle.

[0004] However, in this method used in related technologies, the gear shaft system cannot be decoupled during transmission, resulting in energy loss and low transmission efficiency. Summary of the Invention

[0005] To address the aforementioned technical problems, this application provides a two-speed drive device that decouples the transmission components, thereby avoiding energy loss and improving transmission efficiency. Furthermore, it enables direct motor drive, resulting in even higher transmission efficiency.

[0006] The embodiments of this application disclose the following technical solutions:

[0007] On one hand, embodiments of this application provide a two-speed drive device, the device including a planetary carrier, a double-toothed planetary gear, a sun gear, a gear shifting mechanism, and a motor:

[0008] The gear shifting mechanism is connected to the motor;

[0009] When the gear shifting mechanism is in the first position, the gear shifting mechanism is connected to the sun gear, the planet carrier is connected to the sun gear based on the double-tooth planetary gear, and the driving force provided by the motor is transmitted to the planet carrier in sequence through the gear shifting mechanism, the sun gear, and the double-tooth planetary gear.

[0010] When the gear shifting mechanism is in the second position, the gear shifting mechanism is connected to the planetary carrier, the planetary carrier is disconnected from the double-toothed planetary gear, and the driving force provided by the motor is transmitted to the planetary carrier through the gear shifting mechanism.

[0011] The planetary carrier is used to output power from the driving force.

[0012] As can be seen from the above technical solution, the gear shifting mechanism is connected to the motor. When the gear shifting mechanism is in the first position, it is connected to the sun gear, and the planet carrier is connected to the sun gear via a double-tooth planetary gear system. At this time, the driving force provided by the motor is transmitted sequentially through the gear shifting mechanism, the sun gear, and the double-tooth planetary gears to the planet carrier, which then outputs the driving force. When the gear shifting mechanism is in the second position, it is connected to the planet carrier, and the planet carrier is disconnected from the double-tooth planetary gears. At this time, the driving force provided by the motor is transmitted through the gear shifting mechanism to the planet carrier, which then outputs the driving force. It is evident that the gear shifting mechanism can be in different positions, and the connection relationships between the components differ in each position, thus changing the transmission path of the driving force. Different transmission paths result in different driving forces output by the planet carrier, thereby meeting different driving requirements. In this application, the gear shifting mechanism can be in a first position and a second position, thereby achieving two-speed switching. In the second position, the planetary carrier is disconnected from the double-toothed planetary gears, and the driving force is directly transmitted from the motor to the planetary carrier for output through the gear shifting mechanism. Therefore, when the driving force is transmitted to the planetary carrier, it does not drive the double-toothed planetary gears and the sun gear, thus achieving decoupling of the transmission components, avoiding energy loss, and improving transmission efficiency. Furthermore, the essential function of the gear shifting mechanism is to connect different components in different positions. Therefore, in the second position, it can be considered that the driving force of the motor is directly transmitted to the planetary carrier, which is a direct-drive mode of the motor with higher transmission efficiency. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 A schematic diagram of the structure corresponding to the first configuration of a two-speed drive device provided in the embodiments of this application;

[0015] Figure 2 A schematic diagram of a second configuration of a two-speed drive device provided in an embodiment of this application;

[0016] Figure 3 A schematic diagram of the driving force transmission path corresponding to the first gear in the first configuration provided in the embodiments of this application;

[0017] Figure 4 This is a schematic diagram of the driving force transmission path corresponding to the second gear in the first configuration provided in the embodiments of this application;

[0018] Figure 5 This is a schematic diagram of the driving force transmission path corresponding to the first gear in the second configuration provided in the embodiments of this application;

[0019] Figure 6 This is a schematic diagram of the driving force transmission path corresponding to the second gear in the second configuration provided in the embodiments of this application.

[0020] in, Figure 1 and Figure 2 The annotations in the accompanying drawings are explained as follows:

[0021] exist Figure 1 In the diagram, 1. Planetary carrier ①, 2. Clutch C1, 3. Double-tooth planetary gear ①, 4. Gear ring ①, 5. Synchronizer S1, 6. Sun gear ①, 7. Motor rotor shaft ①, 8. Motor ①, 9. Motor ②, 10. Motor rotor shaft ②, 11. Sun gear ②, 12. Synchronizer S2, 13. Gear ring ②, 14. Double-tooth planetary gear ②, 15. Clutch C2, 16. Planetary carrier ②, 17. Motor controller ②, 18. Motor controller ②.

[0022] exist Figure 2 In the diagram, 1. Planetary carrier ①, 2. Clutch C1, 3. Double-gear planetary gear ①, 4. Gear ring ①, 5. Double clutch C3, 6. Sun gear ①, 7. Motor rotor shaft ①, 8. Motor ①, 9. Motor ②, 10. Motor rotor shaft ②, 11. Sun gear ②, 12. Double clutch C4, 13. Gear ring ②, 14. Double-gear planetary gear ②, 15. Clutch C2, 16. Planetary carrier ②, 17. Motor controller ②, 18. Motor controller ②.

[0023] Understandable Figure 3 and Figure 4 All are based on Figure 1 The first configuration in the example is used to illustrate the driving force transmission path. Figure 3 and Figure 4 For the names of the various components, please refer to [link / reference]. Figure 1 The accompanying figure labels and their descriptions. Similarly, Figure 5 and Figure 6 All are based on Figure 2 The second configuration in the example is used to illustrate the driving force transmission path. Figure 5 and Figure 6 For the names of the various components, please refer to [link / reference]. Figure 2 The accompanying figure labels and their descriptions. Detailed Implementation

[0024] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0025] The following examples illustrate this in detail:

[0026] This application provides a two-speed drive device, which may specifically include a planetary carrier, a double-toothed planetary gear, a sun gear, a gear shifting mechanism, and a motor. Specifically:

[0027] In terms of connection, firstly, the gear shifting mechanism is connected to the motor. The motor provides the driving force, and the gear shifting mechanism enables switching between different gears. Specifically, the gear shifting mechanism can be in different positions, and the connection relationships between the components differ in each position, thus achieving gear shifting. More specifically:

[0028] When the gear shifting mechanism is in the first position, it is connected to the sun gear, and the planet carrier is connected to the sun gear via a double-tooth planetary gear system. At this time, the driving force provided by the motor is transmitted sequentially through the gear shifting mechanism, the sun gear, and the double-tooth planetary gears to the planet carrier. That is, when the gear shifting mechanism is in the first position, it can shift to the first gear. In the first gear, the transmission path of the driving force is: motor to gear shifting mechanism, then to the sun gear, then to the double-tooth planetary gears, and finally to the planet carrier, where power is output.

[0029] When the gear shifting mechanism is in the second position, it is connected to the planetary carrier, and disconnected from the double-toothed planetary gears. At this time, the driving force provided by the motor is transmitted to the planetary carrier through the gear shifting mechanism. That is, when the gear shifting mechanism is in the second position, it can shift to the second gear. In the second gear, the transmission path of the driving force is from the motor to the gear shifting mechanism, then directly to the planetary carrier, and finally output power through the planetary carrier.

[0030] It is evident that the gear shifting mechanism can be in different positions, and the connection relationship between the components is different when in different positions, thereby changing the transmission path of the driving force. The different transmission paths result in different driving forces output by the planetary carrier, thus meeting different driving requirements.

[0031] Furthermore, in the second position, the planetary carrier is disconnected from the double-toothed planetary gears, and the driving force is directly transmitted from the motor to the planetary carrier via the gear shifting mechanism. Therefore, when the driving force is transmitted to the planetary carrier, it does not drive the double-toothed planetary gears and the sun gear, thus achieving decoupling of the transmission components, avoiding energy loss, and improving transmission efficiency. Also, the gear shifting mechanism essentially connects different components in different positions. Therefore, in the second position, the motor's driving force can be considered directly transmitted to the planetary carrier, resulting in a direct-drive mode with higher transmission efficiency. In the direct-drive mode, there is no speed ratio adjustment of the motor.

[0032] It should be noted that the gear shifting mechanism is used to switch between different gears, and this application does not impose any limitations on the setting of the gear shifting mechanism. In practical applications, the corresponding gear shifting mechanism can be flexibly set according to the actual application scenario or the requirements of the vehicle that needs to be equipped with a two-speed drive device. In one possible implementation, the gear shifting mechanism can be a synchronizer, which uses the synchronizer to achieve gear shifting based on position changes. In another possible implementation, the gear shifting mechanism can be a second clutch, which uses the second clutch to achieve gear shifting based on position changes.

[0033] For the two-speed drive device provided in this application, in order to better understand, the embodiments of this application take the aforementioned synchronizer as the gear shifting mechanism, and provide the following... Figure 1 The diagram shows a structural schematic corresponding to the first configuration of a two-speed drive device. Furthermore, this application embodiment, taking the aforementioned second clutch as the gear shifting mechanism, provides the following... Figure 2 The diagram shows a second configuration of a two-speed drive mechanism. Specifically:

[0034] first, Figure 1 and Figure 2 The difference between the examples lies in the gear shifting mechanism. In the first and second configurations, different gear shifting mechanisms are used to achieve the aforementioned two-gear shifting drive.

[0035] Secondly, in Figure 1 Examples and Figure 2In the example, two sets of the aforementioned two-speed drive units can be included. This is mainly because, in practical applications, when the two-speed drive units are installed in a vehicle, the torque requirements of different wheels during driving may differ. Therefore, equipping two sets of the aforementioned two-speed drive units can achieve dual-motor drive, independently providing corresponding driving force for different wheel end requirements, realizing independent torque distribution to the wheels, adjusting grip and lateral dynamics, providing high torque across any speed range, and improving handling. In specific implementations, if there are multiple wheels, each of the multiple wheels can correspond to one of the aforementioned two-speed drive units. Based on this, mechanical coupling between the two motors can be eliminated, the differential can be removed, and the system structure can be simplified. Of course, depending on the actual assembly requirements, one two-speed drive unit can also be used to provide driving force to multiple wheels. Therefore, it can be flexibly configured according to actual needs.

[0036] Corresponding to Figure 1 The first configuration of the example, embodiments of this application also provide, as shown in the example... Figure 3 The example shows a schematic diagram of the driving force transmission path in first gear, and as shown below. Figure 4 The example diagram illustrates the driving force transmission path in second gear, as explained below:

[0037] Figure 3 The example is that the aforementioned gear shifting mechanism is in the first position, i.e., the first gear. Specifically, in Figure 3 In the example, synchronizer S1 is in the right position, and the synchronizer S1 gear sleeve engages with the sun gear ① to achieve connection. At this time, the driving force provided by motor ① is transmitted sequentially through synchronizer S1, sun gear ①, and double-toothed planetary gear ① to the planet carrier ①. For details, please refer to [link to example]. Figure 3 The example is shown by the dashed arrow on the left. Similarly, synchronizer S2 is in the left position, and the synchronizer S2 gear sleeve engages with the sun gear ②, thus achieving connection. At this time, the driving force provided by motor ② is transmitted sequentially through synchronizer S2, sun gear ②, and double-toothed planetary gear ② to the planet carrier ②. For details, please refer to... Figure 3 As shown by the dashed arrow on the right side of the example.

[0038] Figure 4 The example is that the aforementioned gear shifting mechanism is in the second position, that is, the second gear. Specifically, in Figure 4 In the example, synchronizer S1 is in the left position, and the synchronizer S1 sleeve engages with the planetary carrier ① to achieve connection. At this time, the driving force provided by motor ① is directly transmitted to planetary carrier ① through synchronizer S1, realizing direct drive of the motor. For details, please refer to [link to example]. Figure 3The example is shown by the dashed arrow on the left. Similarly, synchronizer S2 is in the right position, and the synchronizer S2 sleeve engages with the planetary carrier ②, thus achieving connection. At this time, the driving force provided by motor ② is directly transmitted to the planetary carrier ② via synchronizer S2, realizing direct drive of the motor. For details, please refer to [link to relevant documentation]. Figure 3 As shown by the dashed arrow on the right side of the example.

[0039] Corresponding to Figure 2 The second configuration of the example, as provided in the embodiments of this application, is as follows: Figure 5 The example shows a schematic diagram of the driving force transmission path in first gear, and as shown below. Figure 6 The example diagram illustrates the driving force transmission path in second gear, as explained below:

[0040] against Figure 2 In the second configuration of the example, the gear shifting mechanism is clutch C3, specifically a dual-clutch structure. In this configuration, the pressure plate of the dual-clutch C3 is connected to the motor rotor shaft ①, which is loosely fitted onto the sun gear ①. The driven plates at both ends of the dual-clutch C3 are used to connect the sun gear ① and the planetary carrier ①, respectively, thereby achieving gear shifting. The same principle applies to the dual-clutch C4. That is, Figure 2 In the example, the aforementioned second clutch may include clutch C3 and clutch C4. Specifically:

[0041] exist Figure 5 In the example, the dual-clutch C3 is in the right position, and the pressure plate of the dual-clutch C3 engages with the right driven plate, thereby enabling the motor rotor shaft ① to engage with the sun gear ①. Based on this, the driving force provided by the motor ① is transmitted sequentially through the dual-clutch C3, the sun gear ①, and the double-toothed planetary gear ① to the planet carrier ①. For details, please refer to [link to example]. Figure 5 As shown by the dashed arrow on the left in the example. Similarly, with the dual clutch C4 in the left position, the pressure plate engages with the left driven plate, realizing the engagement of the motor rotor shaft ② with the sun gear ②. Based on this, the driving force provided by the motor ②, after passing through the dual clutch C4, the sun gear ②, and the double-toothed planetary gear ②, is transmitted to the planet carrier ②. For details, please refer to [link to relevant documentation]. Figure 5 As shown by the dashed arrow on the right side of the example.

[0042] exist Figure 6 In the example, the dual clutch C3 is in the left position, so the pressure plate engages with the left driven plate, realizing the engagement of the motor rotor shaft ① and the planetary carrier ①. Therefore, the driving force provided by the motor ① can be directly transmitted to the planetary carrier ① through the dual clutch C3, realizing direct drive of the motor. For details, please refer to [link to example]. Figure 6 As shown by the dashed arrow on the left in the example. Similarly, with the dual clutch C4 in the right position, the pressure plate engages with the right driven plate, realizing the engagement of the motor rotor shaft ② and the planetary carrier ②. Therefore, the driving force provided by the motor ② can be directly transmitted to the planetary carrier ② through the dual clutch C4, realizing direct drive of the motor. For details, please refer to [reference needed]. Figure 6 As shown by the dashed arrow on the right side of the example.

[0043] The above examples illustrate the two-gear switching drive method provided in this application based on different gear switching mechanisms. When the gear switching mechanism is in the second position (second gear), the driving force provided by the motor is directly transmitted to the planetary carrier. To improve transmission efficiency and avoid energy loss, in this application, when in the second position, the planetary carrier and the double-toothed planetary gears are disconnected. Thus, when the driving force is transmitted to the planetary carrier, it will not drive the double-toothed planetary gears and the sun gear, thereby achieving decoupling of the transmission components, avoiding energy loss, and improving transmission efficiency.

[0044] This application does not impose any limitations on how to achieve the disconnection between the planet carrier and the double-toothed planetary gears in the second position. For ease of understanding, the following examples are provided in the embodiments of this application:

[0045] In one possible implementation, the aforementioned two-speed drive device may further include a first clutch, which can be installed between the planet carrier and the double-toothed planetary gears. When the gear shifting mechanism is in the first position, the first clutch is closed, connecting the planet carrier and the double-toothed planetary gears. Based on this, the driving force provided by the motor can be transmitted from the double-toothed planetary gears to the planet carrier. When the gear shifting mechanism is in the second position, the first clutch is disengaged, disconnecting the planet carrier from the double-toothed planetary gears. Therefore, in the direct-drive mode, when the driving force is transmitted to the planet carrier, it does not drive the double-toothed planetary gears or the sun gear, thus achieving decoupling of the transmission components, avoiding energy loss, and improving transmission efficiency.

[0046] In practical applications, the first clutch can be designed and installed on the planet carrier to better control the connection and disconnection between the planet carrier and the double-toothed planetary gears. Based on this, by designing the first clutch on the planet carrier, the planet carrier can be decoupled from the double-toothed planetary gears and the sun gear, thereby achieving complete decoupling between the motor and the gear shaft system. During the transmission of driving force in the second gear, there is no efficiency loss caused by gear meshing, resulting in higher transmission efficiency.

[0047] For ease of understanding, the first clutch can be referred to... Figure 1 The example shows clutches C1 and C2, and can be found in [reference]. Figure 2 Clutches C1 and C2 are shown in the example. Further details can be found in [link to relevant documentation]. Figure 3 Examples and Figure 5 For example, when the gear shifting mechanism is in the first position, i.e., the first gear, both clutches C1 and C2 are engaged, thus enabling the connection between the planetary carrier ① and the double-toothed planetary gear ①, ensuring the transmission of driving force. See also... Figure 4 Examples and Figure 6 For example, when the gear shifting mechanism is in the second position, i.e. the second gear, both clutches C1 and C2 are in the disengaged state. Therefore, the planet carrier ① and the double-toothed planetary gear ① can be disconnected, achieving decoupling, avoiding energy loss, and improving transmission efficiency.

[0048] In practical applications, when the gear shifting mechanism is in the first position, i.e., the first gear, the driving force transmission path includes the sun gear, double-tooth planetary gears, etc. In this case, the reduction ratio can be adjusted to meet the requirements of a large speed ratio.

[0049] In one possible implementation, gear meshing can be used between transmission components to adjust the transmission ratio and meet the requirement of a large reduction ratio. Specifically, the planet carrier and the double-toothed planetary gears can be meshed based on a first gear, and the double-toothed planetary gears and the sun gear can be meshed based on a second gear. The reduction ratio increases when the driving force is transmitted to the double-toothed planetary gears via the sun gear and the second gear, and it also increases when the driving force is transmitted to the planet carrier via the double-toothed planetary gears and the first gear. Based on this, two-stage reduction ratios can be achieved, thus meeting the requirement of a large reduction ratio. For example, in scenarios where the vehicle is under high load and traveling at low speed, the requirement of a large reduction ratio can be met based on the first gear.

[0050] The first gear can be seen in [reference]. Figure 1 N1 in the example and Figure 2 In the example, N1, the second gear, can be found in [reference needed]. Figure 1 N2 in the example and Figure 2 N2 in the example. It should be noted that... Figure 1 Examples and Figure 2 In the example, the left and right sides are two symmetrical two-speed drive devices, so the first and second gears on the right side are not marked. Please refer to the example in the figure for details.

[0051] In practical applications, the double-toothed planetary gear and the sun gear can be connected based on a gear ring, for example, see [link to relevant documentation]. Figure 1 and Figure 2 The example shows gear ring ① and gear ring ②. Typically, a component consisting of a gear ring, double-gear planetary gears, a planet carrier, and a sun gear can be called a planetary gear reducer. When the driving force passes sequentially through the gear shifting mechanism, the various components of the planetary gear reducer, and the first clutch (such as clutch C1 and clutch C2), it can achieve the aforementioned two-stage reduction, meeting the requirements for a large reduction ratio. Therefore, the planetary gear reducer, the first clutch, and the gear shifting mechanism can be collectively referred to as a two-speed reducer structure to better meet different vehicle speed requirements and improve the vehicle's NVH performance and system efficiency.

[0052] In practical applications, in addition to the aforementioned first and second positions, the gear shifting mechanism can also be in a third position to achieve a third gear. Specifically, when the gear shifting mechanism is in the third position, it is disconnected from the planetary carrier and the sun gear. Therefore, the driving force provided by the motor cannot be transmitted, and thus, when the gear shifting mechanism is in the third position, neutral (the third gear) can be achieved, better meeting actual driving needs.

[0053] For example, see Figure 1 For example, in the gear shifting mechanism, when both synchronizer S1 and synchronizer S2 are in the neutral position, they are disconnected from the sun gear and planet carrier, so driving force is not transmitted. See also... Figure 2 For example, in the gear shifting mechanism, both clutches C3 and C4 are in the neutral position. At this time, the pressure plate is not engaged with either of the driven plates, thus achieving the purpose of disconnecting from the sun gear and planet carrier, so the driving force is not transmitted.

[0054] In practical applications, one end of the motor can be the motor rotor shaft, through which the motor outputs driving force. Therefore, in one possible implementation, the motor is connected to the gear shifting mechanism via the motor rotor shaft. That is, one end of the motor rotor shaft is connected to the motor, and the other end is connected to the gear shifting mechanism, thereby achieving the aforementioned purpose of connecting the gear shifting mechanism and the motor.

[0055] For example, see Figure 1 In the example, the motor rotor shaft ① is connected to the motor ① at one end and to the synchronizer S1 at the other end. Figure 1 In the example, the motor rotor shaft ② is connected to the motor ② at one end and to the synchronizer S2 at the other end. See also... Figure 2 In the example, the motor rotor shaft ① is connected to the motor ① at one end and to the clutch C3 at the other end. Figure 2 In the example, the motor rotor shaft ② is connected to the motor ② at one end and to the clutch C4 at the other end.

[0056] In practical applications, the motor rotor shaft can be loosely fitted onto the sun gear. Thus, when the gear shifting mechanism is in the first position, the connection between the motor rotor shaft and the sun gear is achieved through the gear shifting mechanism. At this time, the driving force provided by the motor is transmitted sequentially through the motor rotor shaft, the gear shifting mechanism, the sun gear, etc., to the planetary carrier, ensuring the transmission of driving force.

[0057] For example, see Figure 1For example, the motor rotor shaft ① is loosely fitted in the sun gear ① and connected to the synchronizer S1 gear drum via a spline. The motor rotor shaft ② is loosely fitted in the sun gear ② and connected to the synchronizer S2 gear drum via a spline. Based on this, the motor rotor shaft is loosely fitted on the sun gear, and one end of the motor rotor shaft is connected to the synchronizer (i.e., the aforementioned gear shifting mechanism). See also... Figure 2 For example, the motor rotor shaft ① is loosely fitted in the sun gear ① and connected to the pressure plate of the dual clutch C3, while the motor rotor shaft ② is loosely fitted in the sun gear ② and connected to the pressure plate of the dual clutch C4. Based on this, the motor rotor shaft is loosely fitted on the sun gear, and one end of the motor rotor shaft is connected to the second clutch (i.e., the aforementioned gear shifting mechanism).

[0058] When using the two-speed drive device provided in this application, the planetary carrier can be used to output driving force. In practical applications, one end of the planetary carrier can be connected to the vehicle's wheel, where the wheel is the demand side for driving force. Based on this, the planetary carrier outputs driving force to the wheel to achieve drive. In terms of installation, the motor and wheel are mounted coaxially. Therefore, the driving force supply side and the driving force demand side are coaxially mounted, which is beneficial for improving transmission efficiency and saving overall vehicle installation space, thereby increasing integration and facilitating vehicle layout.

[0059] For example, see Figure 1 Examples and Figure 2 For example, motor ① and motor ② are coaxially arranged with the two-speed reducer structures on both sides, and one end of the planetary carrier in the two-speed reducer structure is connected to the wheel, which is also coaxially arranged.

[0060] In practical applications, the aforementioned two-speed drive unit may also include a motor controller, which controls the motor to provide driving force. Typically, the motor controller can be connected to the stator of the motor via a three-phase BUSBAR. For example, see [link to relevant documentation]. Figure 1 Examples and Figure 2 For example, motor controller ① can be PEB1, and motor controller ② can be PEB2, both arranged parallel to each other in front of motor ① and motor ②. Motor controller ① is connected to the stator of motor ① via a three-phase BUSBAR, and motor controller ② is connected to the stator of motor ② via a three-phase BUSBAR.

[0061] In practical applications, after assembling the two-speed drive device provided in this application into a vehicle, when the vehicle starts or requires high torque, the gear shifting mechanism can be controlled to the first position, i.e., shifted to the first gear for drive, and the high torque requirement is met based on the reduction ratio adjustment. When the vehicle requires high speed, the gear shifting mechanism can be controlled to the second position, i.e., shifted to the second gear for drive, and the high speed requirement is met based on direct drive of the motor. When the vehicle needs to conserve resources for coasting, the gear shifting mechanism can be controlled to the third position, i.e., shifted to the third gear, which is neutral, and the resource-saving requirement is met based on coasting in neutral.

[0062] As can be seen from the above technical solution, the gear shifting mechanism is connected to the motor. When the gear shifting mechanism is in the first position, it is connected to the sun gear, and the planet carrier is connected to the sun gear via a double-tooth planetary gear system. At this time, the driving force provided by the motor is transmitted sequentially through the gear shifting mechanism, the sun gear, and the double-tooth planetary gears to the planet carrier, which then outputs the driving force. When the gear shifting mechanism is in the second position, it is connected to the planet carrier, and the planet carrier is disconnected from the double-tooth planetary gears. At this time, the driving force provided by the motor is transmitted through the gear shifting mechanism to the planet carrier, which then outputs the driving force. It is evident that the gear shifting mechanism can be in different positions, and the connection relationships between the components differ in each position, thus changing the transmission path of the driving force. Different transmission paths result in different driving forces output by the planet carrier, thereby meeting different driving requirements. In this application, the gear shifting mechanism can be in a first position and a second position, thereby achieving two-speed switching. In the second position, the planetary carrier is disconnected from the double-toothed planetary gears, and the driving force is directly transmitted from the motor to the planetary carrier for output through the gear shifting mechanism. Therefore, when the driving force is transmitted to the planetary carrier, it does not drive the double-toothed planetary gears and the sun gear, thus achieving decoupling of the transmission components, avoiding energy loss, and improving transmission efficiency. Furthermore, the essential function of the gear shifting mechanism is to connect different components in different positions. Therefore, in the second position, it can be considered that the driving force of the motor is directly transmitted to the planetary carrier, which is a direct-drive mode of the motor with higher transmission efficiency.

[0063] It should be noted that, in this document, relational terms such as "first" and "second," if present, are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0064] The foregoing has provided a detailed description of a two-speed drive device according to embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are merely for the purpose of helping to understand the methods of this application. Furthermore, those skilled in the art will recognize that variations in the specific implementation methods and application scope may occur based on the methods of this application.

[0065] In summary, the content of this specification should not be construed as limiting this application. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of this application. Furthermore, based on the implementation methods provided in the above aspects, this application can be further combined to provide more implementation methods.

Claims

1. A two-speed drive apparatus characterized by comprising: The device comprises a planet carrier, a double-toothed planet wheel, a sun gear, a gear shifting mechanism and a motor: The gear shifting mechanism is connected with the motor; When the gear shifting mechanism is in the first position, the gear shifting mechanism is connected with the sun gear, the planet carrier is connected with the sun gear based on the double-toothed planet wheel, and the driving force provided by the motor is transmitted to the planet carrier in sequence through the gear shifting mechanism, the sun gear and the double-toothed planet wheel; When the gear shifting mechanism is in the second position, the gear shifting mechanism is connected with the planet carrier, the planet carrier is disconnected with the double-toothed planet wheel, and the driving force provided by the motor is transmitted to the planet carrier through the gear shifting mechanism; The planet carrier is used for power output of the driving force.

2. The apparatus of claim 1, wherein, The device further comprises a first clutch: The first clutch is installed between the planet carrier and the double-toothed planet wheel; When the gear shifting mechanism is in the first position, the first clutch is in a closed state to realize the connection between the planet carrier and the double-toothed planet wheel; When the gear shifting mechanism is in the second position, the first clutch is in a disconnected state to realize the disconnection between the planet carrier and the double-toothed planet wheel.

3. The apparatus of claim 1, wherein, The planet carrier and the double-toothed planet wheel are connected based on a first gear, the double-toothed planet wheel and the sun gear are connected based on a second gear, the reduction ratio increases when the driving force is transmitted to the double-toothed planet wheel through the sun gear and the second gear, and the reduction ratio increases when the driving force is transmitted to the planet carrier through the double-toothed planet wheel and the first gear.

4. The apparatus of claim 1, wherein, When the gear shifting mechanism is in the third position, the gear shifting mechanism is disconnected with the planet carrier, and the gear shifting mechanism is disconnected with the sun gear.

5. The apparatus of claim 1, wherein, The gear shifting mechanism is a synchronizer.

6. The apparatus of claim 1, wherein, The gear shifting mechanism is a second clutch.

7. The apparatus of claim 1, wherein, One end of the planet carrier is connected with a wheel of a vehicle, the planet carrier outputs the driving force to the wheel, and the motor and the wheel are coaxially installed.

8. The apparatus of claim 8, wherein, The number of the wheels is multiple, and each wheel of the multiple wheels corresponds to one two-gear driving device.

9. The apparatus of any of claims 1-8, wherein, One end of the motor is a motor rotor shaft, and the motor is connected with the gear shifting mechanism through the motor rotor shaft.

10. The apparatus of claim 9, wherein, The motor rotor shaft is sleeved on the sun gear, and when the gear shifting mechanism is in the first position, the motor rotor shaft is connected with the sun gear based on the gear shifting mechanism.

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