Power transmission device and vehicle
Patent Information
- Application Number
- PCT/CN2025/091526
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2025-04-10
- Filing Date
- 2025-04-27
- Publication Date
- 2026-09-03
Smart Images
Figure CN2025091526_03092026_PF_FP_ABST
Abstract
Description
Power transmission devices and vehicles
[0001] This disclosure claims priority to Chinese Patent Application No. 202520349247.8, filed on February 28, 2025, entitled "Power Transmission Device and Vehicle", and also claims priority to Chinese Patent Application No. 202520680524.3, filed on April 10, 2025, entitled "Power Transmission Device and Vehicle", the entire contents of which are incorporated herein by reference. Technical Field
[0002] This disclosure relates to the field of vehicle transmission technology, and in particular to a power transmission device. This disclosure also relates to a vehicle equipped with the above-mentioned power transmission device. Background Technology
[0003] Currently, most hybrid electric vehicles use all-wheel drive (AWD) systems, where all wheels participate in driving. Some models are primarily front-wheel drive, while others are primarily rear-wheel drive. Taking a primarily front-wheel drive vehicle as an example, the engine on the front axle is the primary power source, while a P4 (Position 4) motor on the rear axle provides auxiliary drive. To reduce energy consumption, increase vehicle range, reduce motor losses, extend inverter life, reduce component wear, and improve overall NVH performance, it is imperative to include a disconnection device in all-wheel drive (AWD) models.
[0004] Furthermore, as consumers increasingly demand higher off-road performance from their vehicles, differential lock functionality has become a prerequisite for handling complex road conditions during light off-roading and tackling extreme terrain during heavy off-roading. Given this market demand for improved vehicle traction under extreme conditions, developing a device that cleverly integrates a differential lock with a disconnect mechanism undoubtedly has extremely broad application prospects.
[0005] However, given the current state of technology, the disconnect mechanism and differential lock are mostly independent components in vehicle design. Specifically, the main working parts of the disconnect mechanism include dog-tooth and one-way clutch structures. Their operation is quite diverse, typically utilizing power generated by an electric motor, precise control of electromagnetic force, strong thrust from pneumatic devices, or stable pressure from a hydraulic system to drive key components such as worm gears, ball screws, and cams. Furthermore, depending on the power source and the actual actuators selected for different vehicle models, flexible and varied combinations are designed to meet the driving needs of the vehicle under various operating conditions.
[0006] In contrast, differential locks generally have two main design schemes: one is a mechanical structure in which a fork and canine teeth work together closely. The precise movement of the fork enables the canine teeth to engage and disengage, thereby controlling the opening and closing of the differential lock; the other is a mode in which an electromagnet works in conjunction with the canine teeth. The strong attraction force of the electromagnet after it is energized drives the canine teeth to quickly complete the corresponding action, thus effectively realizing the function of the differential lock.
[0007] Unfortunately, due to technological complexity and spatial limitations, simultaneously achieving both differential lock and differential disengagement functions perfectly on a single vehicle remains a significant challenge, often failing to achieve the desired synergistic effect. This not only results in most existing drive or transmission systems having limited differential systems with only differential function, failing to meet the dual demands of complex road conditions and energy efficiency, but also hinders the simultaneous improvement of fuel economy in both off-road vehicles equipped with differential locks and high-efficiency transmission vehicles equipped with differential disengagement devices due to low integration. Consequently, the vehicle's adaptability under various operating conditions is significantly reduced. Therefore, overcoming existing technological bottlenecks and creating a multifunctional, highly integrated, and highly reliable differential system has become a crucial issue that the automotive industry urgently needs to address. Summary of the Invention
[0008] In view of this, the present disclosure aims to provide a power transmission device that not only integrates differential, disconnection and locking functions, but also has higher reliability.
[0009] To achieve the above objectives, the technical solution disclosed herein is implemented as follows:
[0010] A power transmission device includes a device housing, a half-shaft gear disposed in the device housing, an input shaft connected to the half-shaft gear, an output shaft sleeve disposed axially along the input shaft and corresponding to the input shaft, and a first engagement assembly and / or a second engagement assembly disposed on the input shaft.
[0011] The first engagement assembly includes a first engagement sleeve slidably disposed on the input shaft. The first engagement sleeve is driven to move axially along the input shaft, and is capable of establishing a transmission connection with the output shaft sleeve or disengaging from the transmission connection with the output shaft sleeve.
[0012] The second engagement assembly includes a second engagement sleeve slidably disposed on the input shaft. The second engagement sleeve is driven to move axially along the input shaft, enabling it to establish a transmission connection with the device housing or disengage from the transmission connection with the device housing.
[0013] Furthermore, it also includes a first housing spaced apart from the device housing, and the input shaft is provided with both the first engagement component and the second engagement component; the output shaft sleeve is rotatably disposed in the first housing, the first engagement component and the second engagement component are both located in the first housing, and the second engagement component is located between the first engagement component and the device housing.
[0014] Furthermore, it also includes a first housing spaced apart from the device housing, the output shaft sleeve being rotatably disposed in the first housing; the input shaft is provided with the first engagement assembly, the first engagement assembly being located in the first housing, or the input shaft is provided with the second engagement assembly, the second engagement assembly being located in the first housing.
[0015] Furthermore, the first engagement assembly further includes a first driving member, which is throttle-connected to the first engagement sleeve to drive the first engagement sleeve to move axially along the input shaft; the second engagement assembly further includes a second driving member, which is throttle-connected to the second engagement sleeve to drive the second engagement sleeve to move axially along the input shaft.
[0016] Furthermore, both the first and second coupling sleeves are provided with magnetic bodies, and both the first and second driving components include electromagnetic coils disposed on the first housing.
[0017] Furthermore, along the axial direction of the input shaft, the magnetic body is located on one side of the electromagnetic coil; or, along the radial direction of the input shaft, the magnetic body is located between the electromagnetic coil and the input shaft.
[0018] Furthermore, a magnetic shield corresponding to each of the magnetic bodies is slidably provided on the input shaft, and the magnetic bodies are disposed on the magnetic shield.
[0019] Furthermore, the electromagnetic coil is disposed in the first housing through the second housing, and an abutting part is provided on the second housing, and the abutting part is used to attract the magnetic body together and limit the movement stroke of the magnetic body.
[0020] Furthermore, the second housing is provided with locking members on both sides along the axial direction of the input shaft, and the second housing is disposed on the first housing through the locking members on both sides; or, the inner wall of the first housing is provided with a shoulder and a locking member spaced apart from the shoulder, and the second housing is disposed between the shoulder and the locking member.
[0021] Furthermore, the first engagement assembly also includes a first elastic element disposed between the input shaft and the first engagement sleeve. The first engagement sleeve is kinetically connected to the output shaft sleeve, and when the first engagement sleeve is driven to move axially along the input shaft, it can compress the first elastic element and move away from the output shaft sleeve.
[0022] Furthermore, the input shaft is provided with a shoulder, one end of the first elastic element is connected to the shoulder, and the other end of the first elastic element is connected to the first coupling sleeve.
[0023] Furthermore, the second engagement assembly also includes a second elastic element disposed between the input shaft and the second engagement sleeve, which, when driven to move axially along the input shaft, can compress the second elastic element to approach and drive the device housing.
[0024] Furthermore, the input shaft is provided with a detachable stop, one end of the second elastic member is connected to the stop, and the other end of the second elastic member is connected to the second engaging sleeve.
[0025] Furthermore, the input shaft is provided with the second engagement assembly; a connecting shaft is provided on the side of the device housing facing the output shaft sleeve, the input shaft passes through the shaft hole of the connecting shaft and is drivenly connected to the output shaft sleeve, and the second engagement sleeve is drivenly connected to the device housing through the connecting shaft.
[0026] Compared with the prior art, this disclosure has the following advantages:
[0027] The power transmission device disclosed herein, based on the cooperative arrangement of the first and second engaging components, enables the coaxial arrangement of the first and second engaging sleeves, facilitating the positioning and movement of the two engaging sleeves, thereby improving the transmission reliability of both. When used as a differential assembly, the differential function can be achieved through the transmission connection between the first engaging sleeve and the output shaft sleeve, and the disconnection function can be achieved by disengaging the first engaging sleeve from the output shaft sleeve to reduce energy loss. Simultaneously, the locking function can also be achieved through the transmission connection between the first engaging sleeve and the output shaft sleeve, and the transmission connection between the second engaging sleeve and the device housing, thereby improving the vehicle's off-road capability and enhancing the overall vehicle driving performance. This contributes to the improvement of the product quality of the power transmission device.
[0028] Meanwhile, when the power transmission device of this disclosure is used as a differential assembly and only equipped with the first engagement component, the differential function can be achieved through the transmission connection between the first engagement sleeve and the output shaft sleeve, and the disconnection function can be achieved by disengaging the first engagement sleeve from the output shaft sleeve, thereby reducing energy loss. This not only enables the optional function of the power transmission device, meeting customers' needs for vehicle power types requiring only differential and disconnection functions, but also helps reduce costs. Similarly, when the power transmission device of this disclosure is used as a differential assembly and only equipped with the second engagement component, the locking function can be achieved through the transmission connection between the second engagement sleeve and the device housing, improving the vehicle's off-road capability. This not only enables the optional function of the power transmission device, meeting customers' needs for vehicle power types requiring only differential and locking functions, but also helps reduce costs.
[0029] Furthermore, by setting up the first housing, the arrangement and installation of the output shaft sleeve, the first engagement assembly, and the second engagement assembly are facilitated, and the overall layout rationality of the power transmission device is improved. By driving the first engagement sleeve to move through the first driving member, and by driving the second engagement sleeve to move through the second driving member, individual control of the two engagement sleeves can be achieved, thereby improving the control reliability of both. The structure employing a combination of a magnetic body and an electromagnetic coil allows for precise control of the magnetic body's movement using electromagnetic force, thus achieving precise control of the movement of both the first and second engagement sleeves.
[0030] Furthermore, aligning each magnetic element along the input shaft axial direction with its corresponding electromagnetic coil on one side not only facilitates the arrangement and installation of the magnetic elements and their corresponding electromagnetic coils, improving maintenance convenience, but also promotes heat dissipation from the electromagnetic coils, extending their service life. Conversely, aligning each magnetic element radially along the input shaft between its corresponding electromagnetic coil and the input shaft enhances the magnetic driving force acting on the magnetic element, as well as the stability of that force, enabling high-precision control. The inclusion of a magnetic shield prevents interference from stray external magnetic fields, further improving the accuracy of the magnetic element's drive. The presence of a contact portion not only enhances the attraction of the magnetic element but also limits its travel distance, improving the reliability of the magnetic element's drive and consequently enhancing the overall reliability of the various coupling sleeves.
[0031] Furthermore, the second housing is mounted on the first housing via two side retaining members, or it is positioned between the shoulder and the retaining members, facilitating easy assembly and disassembly of the second housing, thus enabling the assembly and disassembly of the electromagnetic coil. The shoulder facilitates the installation and arrangement of the first elastic element, and the detachable retaining member also facilitates the installation and arrangement of the second elastic element. The arrangement of the connecting shaft allows for a more rational layout of the device housing, input shaft, second coupling assembly, and other related components, facilitating the transmission connection between the second coupling sleeve and the device housing.
[0032] Another object of this disclosure is to provide a vehicle equipped with the power transmission device as described above.
[0033] The vehicle disclosed herein is equipped with the aforementioned power transmission device, which can realize differential, disconnection and locking functions when the power transmission device is used as a differential assembly, and has high reliability, thereby improving the overall vehicle transmission performance. Attached Figure Description
[0034] The accompanying drawings, which form part of this disclosure, are used to provide a further understanding of this disclosure. The illustrative embodiments of this disclosure and their descriptions are used to explain this disclosure and do not constitute an undue limitation of this disclosure. In the drawings:
[0035] Figure 1 is a schematic diagram of the overall structure of the power transmission device of the first example according to the embodiments of this disclosure;
[0036] Figure 2 is a schematic diagram of the assembly of the device housing, input shaft and connecting shaft according to an embodiment of the present disclosure;
[0037] Figure 3 is a schematic diagram of the assembly of the input shaft, output shaft sleeve and first housing according to an embodiment of the present disclosure;
[0038] Figure 4 is an enlarged view of point A in Figure 3;
[0039] Figure 5 is an enlarged view of point B in Figure 3;
[0040] Figure 6 is a schematic diagram of force transmission in the disconnected mode of the power transmission device of the first example of the present disclosure embodiment;
[0041] Figure 7 is a schematic diagram of force transmission in differential mode of the power transmission device of the first example of the present disclosure embodiment;
[0042] Figure 8 is a schematic diagram of force transmission in the locking mode of the power transmission device of the first example described in the embodiments of this disclosure;
[0043] Figure 9 is a schematic diagram of the power transmission device of the second example described in the embodiments of this disclosure;
[0044] Figure 10 is a schematic diagram of the structure of the power transmission device of the third example according to the embodiments of this disclosure;
[0045] Explanation of reference numerals in the attached figures:
[0046] 10. Device housing; 11. Half-shaft gear; 12. Planetary gear; 13. Planetary shaft; 14. Input shaft; 141. Shaft shoulder; 142. Stop; 143. First spline; 144. Second spline; 15. Connecting shaft; 16. Third bearing;
[0047] 20. First housing; 21. Output shaft sleeve; 211. First bearing; 22. Second bearing; 23. Shoulder; 24. Locking element;
[0048] 30a, First joining assembly; 30b, Second joining assembly; 31a, First joining sleeve; 31b, Second joining sleeve; 311, Magnetic body; 312, Magnetic shield; 32a, First driving member; 32b, Second driving member; 321, Second housing; 3211, Abutting part; 322, Electromagnetic coil; 33a, First elastic member; 33b, Second elastic member. Detailed Implementation
[0049] It should be noted that, unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.
[0050] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, so as to provide a thorough understanding of the embodiments of this disclosure. However, those skilled in the art will understand that this disclosure may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this disclosure with unnecessary detail.
[0051] In the description of this disclosure, it should be noted that if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. Furthermore, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0052] Furthermore, in the description of this disclosure, unless otherwise expressly defined, the terms "installation," "connection," "joint," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure in light of the specific circumstances.
[0053] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments. Example 1
[0054] This embodiment relates to a power transmission device, which is particularly suitable as a differential assembly and has higher transmission reliability, thus helping to solve the problems of single function and low transmission reliability of differential systems in traditional technologies.
[0055] Furthermore, when the power transmission device in this embodiment is used as a differential assembly, it can not only integrate differential, disconnect, and lock functions simultaneously, but also have only differential and disconnect functions, or only differential and lock functions, so as to realize the optional configuration of the power transmission device, thereby facilitating the satisfaction of different customers' optional needs for vehicle power types.
[0056] In terms of overall structure, the power transmission device of this embodiment includes a device housing 10, a half-shaft gear 11 disposed in the device housing 10, an input shaft 14 connected to the half-shaft gear 11, and an output shaft sleeve 21 disposed axially along the input shaft 14 and corresponding to the input shaft 14. The input shaft 14 is provided with a first engagement component 30a, or a second engagement component 30b, or the input shaft 14 is provided with a first engagement component 30a and a second engagement component 30b.
[0057] Furthermore, the first engagement assembly 30a includes a first engagement sleeve 31a slidably disposed on the input shaft 14. The first engagement sleeve 31a is driven to move axially along the input shaft 14, enabling it to establish a transmission connection with the output shaft sleeve 21 or disengage from the transmission connection with the output shaft sleeve 21. The second engagement assembly 30b includes a second engagement sleeve 31b slidably disposed on the input shaft 14. The second engagement sleeve 31b is driven to move axially along the input shaft 14, enabling it to establish a transmission connection with the device housing 10 or disengage from the transmission connection with the device housing 10.
[0058] At this time, as set above, the power transmission device of this embodiment has three configurations: the first is that the input shaft 14 is provided with both the first engagement component 30a and the second engagement component 30b; the second is that the input shaft 14 is provided with only the first engagement component 30a; and the third is that the input shaft 14 is provided with only the second engagement component 30b.
[0059] In the first scenario (where the input shaft 14 is simultaneously equipped with a first engagement component 30a and a second engagement component 30b), when the power transmission device functions as a differential assembly (in this case, as mentioned below, the device housing 10 is a differential housing), it can simultaneously integrate differential, disconnect, and locking functions. Specifically, when the power transmission device establishes a transmission connection with the output shaft sleeve 21 through the first engagement sleeve 31a (at which time the second engagement sleeve 31b is disengaged from the device housing 10), it can achieve the differential function. It can also achieve the disconnect function by disengaging the transmission connection between the first engagement sleeve 31a and the output shaft sleeve 21 (at which time the second engagement sleeve 31b is disengaged from the device housing 10), thereby reducing energy loss. At the same time, it can also achieve the locking function by establishing a transmission connection between the first engagement sleeve 31a and the output shaft sleeve 21, and by establishing a transmission connection between the second engagement sleeve 31b and the device housing 10, thereby improving the vehicle's off-road capability and enhancing the overall vehicle driving performance.
[0060] In the second case (where only the first engagement component 30a is provided on the input shaft 14), when the power transmission device is used as a differential assembly, it can have differential and disconnection functions. Specifically, when the power transmission device establishes a transmission connection with the output shaft sleeve 21 through the first engagement sleeve 31a, it can realize the differential function, and when it disengages from the transmission connection between the first engagement sleeve 31a and the output shaft sleeve 21, it can realize the disconnection function to reduce energy loss.
[0061] In the third scenario (where only the second engagement component 30b is provided on the input shaft 14), the power transmission device, when used as a differential assembly, can have both differential and locking functions. Specifically, the power transmission device can establish a transmission connection with the device housing 10 through the second engagement sleeve 31b to achieve the locking function, thereby improving the vehicle's off-road capability and enhancing the overall driving performance. It should be noted that the aforementioned output sleeve 21 is axially aligned with the input shaft 14, which can be understood as the output sleeve 21 corresponding to and being transmission-connected to the input shaft 14. In practice, the output sleeve 21 can preferably be fixedly connected to the input shaft 14. Based on this, the differential function of the power transmission device can be achieved when the second engagement sleeve 31b is disengaged from the device housing 10, and the locking function can be achieved when the second engagement sleeve 31b is established with the device housing 10.
[0062] Based on the above description, in detail, in this embodiment, in specific implementation, the power transmission device can serve not only as a differential assembly but also as other transmission systems requiring disconnection and locking functions. However, when used as other transmission systems, the arrangement and form of the half-shaft gear 11 within the device housing 10 need to be adapted. To clearly describe the power transmission device of this embodiment, this embodiment mainly uses the power transmission device as a specific example of a differential assembly for introduction. Related structures not mentioned in the differential assembly of this embodiment can be referred to in relation to differential systems well-known to those skilled in the art, and will not be elaborated upon further below.
[0063] Furthermore, it should be noted that when the power transmission device in this embodiment is used as a differential assembly, the device housing 10 is the differential housing. The differential housing contains a planetary shaft 13, a planetary gear 12, and the aforementioned half-shaft gear 11. The half-shaft gear 11 is usually arranged in two opposite directions to transmit power to the half-shafts of two opposite wheels (left front wheel and right front wheel, or left rear wheel and right rear wheel).
[0064] That is, in the actual application of the vehicle, corresponding to the two half-shaft gears 11 (or corresponding to the two wheels), the input shaft 14, output shaft sleeve 21, first engagement component 30a and second engagement component 30b in the power transmission device of this embodiment are all arranged in two sets with the left and right sides facing each other. Thus, when the first engagement sleeve 31a is connected to the output shaft sleeve 21, it can realize the function of differential speed between the two wheels. When the first engagement sleeve 31a is disengaged from the output shaft sleeve 21, it can realize the function of disconnecting the transmission of power from the two half-shaft gears 11 to the half-shaft of the corresponding wheel (e.g., four-wheel drive to front-wheel drive), so as to reduce energy loss. Furthermore, when the first engagement sleeve 31a is connected to the output shaft sleeve 21 and the second engagement sleeve 31b is connected to the device housing 10, it can realize the locking function, so that the two half-shaft gears 11 are synchronously driven, thereby realizing the synchronous rotation of the half-shafts of the two wheels and improving the vehicle's off-road escape ability.
[0065] Furthermore, it should be noted that the direction-related descriptions in this embodiment are merely illustrative examples. In actual implementation, the direction descriptions in this embodiment will vary depending on the orientation of the input shaft 14. That is, each direction in this embodiment refers to a relative coordinate system with the input shaft 14 as the reference, in order to clearly and concisely explain the relevant examples of the power transmission device in this embodiment.
[0066] When the power transmission device of this embodiment is used as a differential assembly, it can integrate differential, disconnect and lock functions. In some exemplary embodiments, as shown in Figures 1 to 8, the power transmission device of this embodiment includes a device housing 10, a half-shaft gear 11 disposed in the device housing 10, an input shaft 14 connected to the half-shaft gear 11, an output shaft sleeve 21 disposed axially along the input shaft 14 and corresponding to the input shaft 14, and a first engagement component 30a and a second engagement component 30b disposed on the input shaft 14.
[0067] Furthermore, the first engagement assembly 30a includes a first engagement sleeve 31a slidably disposed on the input shaft 14, and a first elastic member 33a disposed between the input shaft 14 and the first engagement sleeve 31a. The first engagement sleeve 31a is drive-connected to the output shaft sleeve 21, and when the first engagement sleeve 31a is driven to move axially along the input shaft 14, it can compress the first elastic member 33a and move away from the output shaft sleeve 21. The second engagement assembly 30b includes a second engagement sleeve 31b slidably disposed on the input shaft 14, and a second elastic member 33b disposed between the input shaft 14 and the second engagement sleeve 31b. When the second engagement sleeve 31b is driven to move axially along the input shaft 14, it can compress the second elastic member 33b to approach and drive the connection device housing 10.
[0068] At this point, with the above configuration, based on the cooperative arrangement of the first engaging component 30a and the second engaging component 30b, the coaxial arrangement of the first engaging sleeve 31a and the second engaging sleeve 31b can be achieved. This facilitates the positioning and movement of the two engaging sleeves, thereby improving the transmission reliability of both. Furthermore, when used as a differential assembly, the differential function can be achieved through the transmission connection between the first engaging sleeve 31a and the output shaft sleeve 21, and the disconnection function can be achieved by disengaging the first engaging sleeve 31a from the output shaft sleeve 21 to reduce energy loss. Simultaneously, the locking function can also be achieved through the transmission connection between the first engaging sleeve 31a and the output shaft sleeve 21, and the transmission connection between the second engaging sleeve 31b and the device housing 10, improving the vehicle's off-road capability and enhancing overall vehicle driving performance. Therefore, this power transmission device, when used as a differential assembly, integrates three functions: differential, disconnection, and locking.
[0069] In this embodiment, as a preferred implementation, referring to Figures 1 and 3, the power transmission device further includes a first housing 20 disposed axially with respect to the device housing 10 along the input shaft 14. Simultaneously, the output shaft sleeve 21 is rotatably disposed within the first housing 20, and both the first engagement component 30a and the second engagement component 30b are located within the first housing 20, with the second engagement component 30b positioned between the first engagement component 30a and the device housing 10. This arrangement facilitates the arrangement and installation of the output shaft sleeve 21, the first engagement component 30a, and the second engagement component 30b, and improves the overall layout rationality of the power transmission device.
[0070] In a preferred embodiment, the first engagement assembly 30a further includes a first driving member 32a, which is convexly connected to the first engagement sleeve 31a to drive the first engagement sleeve 31a to move axially along the input shaft 14. Similarly, in another preferred embodiment, the second engagement assembly 30b further includes a second driving member 32b, which is convexly connected to the second engagement sleeve 31b to drive the second engagement sleeve 31b to move axially along the input shaft 14. Here, by using the first driving member 32a to drive the first engagement sleeve 31a and the second driving member 32b to drive the second engagement sleeve 31b, individual control of the two engagement sleeves can be achieved, thereby improving the control reliability of both.
[0071] In this embodiment, as a preferred implementation, as shown in Figures 1, 3, and 4, both the first coupling sleeve 31a and the second coupling sleeve 31b are provided with magnetic bodies 311, and both the first driving member 32a and the second driving member 32b include an electromagnetic coil 322 disposed on the first housing 20. It can be understood that by employing a structure in which the magnetic body 311 and the electromagnetic coil 322 cooperate, electromagnetic force can be used to improve the precise control of the movement of the magnetic body 311, thereby achieving precise control of the movement of the first coupling sleeve 31a and the second coupling sleeve 31b.
[0072] In this preferred embodiment, along the input shaft 14, each magnetic body 311 is located on one side of its corresponding electromagnetic coil 322. This not only facilitates the arrangement and installation of the magnetic body 311 and the corresponding electromagnetic coil 322, improving maintenance convenience, but also facilitates heat dissipation of the electromagnetic coil 322, thus extending its service life.
[0073] Of course, in this embodiment, besides placing each magnetic body 311 on one side of its corresponding electromagnetic coil 322 along the axial direction of the input shaft 14, as shown in Figures 1 and 3, each magnetic body 311 can also be positioned radially along the input shaft 14 between its corresponding electromagnetic coil 322 and the input shaft 14. The main advantage of this arrangement is that it can improve the magnetic driving force acting on the magnetic body 311, as well as the stability of the magnetic driving force, and achieve high-precision control.
[0074] In this preferred embodiment, each electromagnetic coil 322 and each magnetic body 311 is arranged around the input shaft 14 to ensure that there is sufficient attraction between each electromagnetic coil 322 and its corresponding magnetic body 311, so that when each electromagnetic coil 322 is energized, it can attract its corresponding magnetic body 311 to move axially along the input shaft 14, thereby driving the corresponding coupling sleeve to move.
[0075] Meanwhile, in this embodiment, as a preferred implementation, referring to Figure 4, a magnetic shield 312 corresponding to each magnetic body 311 is slidably provided on the input shaft 14, with each magnetic body 311 respectively disposed on its corresponding magnetic shield 312. This arrangement can block the interference of external stray magnetic fields on the driving of the magnetic bodies 311, improve the driving effect, and reduce eddy current loss and hysteresis loss.
[0076] In this embodiment, as a preferred implementation, each electromagnetic coil 322 is disposed within the first housing 20 via a second housing 321, and each second housing 321 is provided with an abutment portion 3211. Each abutment portion 3211 is used to attract and adhere to the corresponding magnetic body 311, and to limit the travel distance of the magnetic body 311. It is understood that providing the abutment portion 3211 not only improves the attraction effect on the magnetic body 311, but also limits the travel distance of the magnetic body 311, improving the driving reliability of the magnetic body 311, thereby enhancing the reliability of each coupling sleeve in use.
[0077] It is worth mentioning that, in specific implementation, each magnetic shield 312 and each second housing 321 in this embodiment can preferably be set as a ring around the input shaft 14, so as to better arrange and install the corresponding magnetic body 311 and electromagnetic coil 322.
[0078] Furthermore, in this embodiment, as a preferred implementation, referring to Figures 1 and 3, the second housing 321 is provided with locking members 24 on both sides along the axial direction of the input shaft 14, and the second housing 321 is mounted on the first housing 20 through the locking members 24 on both sides, so as to facilitate the convenient assembly and disassembly of the second housing 321, that is, to realize the assembly and disassembly of the electromagnetic coil 322.
[0079] Of course, in addition to being provided on the inner wall of the first housing 20 by means of the two side retaining members 24, the second housing 321 can also be provided in other forms. For example, as a preferred embodiment, in this embodiment, the inner wall of the first housing 20 is provided with a shoulder 23 and a retaining member 24 spaced apart from the shoulder 23. The second housing 321 is provided between the shoulder 23 and the retaining member 24, which can also realize the convenient assembly and disassembly of the second housing 321.
[0080] Furthermore, based on the two configurations of the second housing 321 described above, in this embodiment, the second housing 321 in the first driving member 32a can preferably be configured between the shoulder 23 and the retaining member 24, and the second housing 321 in the second driving member 32b can preferably be configured between the retaining members 24 on both sides.
[0081] In addition, in this embodiment, as a preferred implementation, as shown in FIG4, the input shaft 14 is provided with a shoulder 141, one end of the first elastic member 33a is connected to the shoulder 141, and the other end of the first elastic member 33a is connected to the first coupling sleeve 31a. In this way, the installation and arrangement of the first elastic member 33a can be facilitated.
[0082] Meanwhile, in this embodiment, as a preferred implementation, referring to Figure 5, the input shaft 14 is provided with a detachable stop 142. One end of the second elastic member 33b is connected to the stop 142, and the other end of the second elastic member 33b is connected to the second engaging sleeve 31b. By providing the detachable stop 142, the installation and arrangement of the second elastic member 33b can be facilitated.
[0083] In this embodiment, both the retaining member 24 and the blocking member 142 can preferably be retaining rings well known to those skilled in the art, to facilitate easy assembly and disassembly. In this embodiment, both the first elastic member 33a and the second elastic member 33b can preferably be springs to reduce costs.
[0084] In addition, in this embodiment, as a preferred implementation, as shown in Figures 1 to 3, a connecting shaft 15 is provided on the side of the device housing 10 facing the output shaft sleeve 21. The input shaft 14 passes through the shaft hole of the connecting shaft 15 and is connected to the output shaft sleeve 21 in a driving connection. The second engaging sleeve 31b is connected to the device housing 10 in a driving connection via the connecting shaft 15. This allows for a more rational arrangement of the device housing 10, the input shaft 14, the second engaging assembly 30b, and other related components, facilitating the driving connection between the second engaging sleeve 31b and the device housing 10.
[0085] It is worth mentioning that the first engaging sleeve 31a and the second engaging sleeve 31b in this embodiment can be dog-tooth type engaging sleeves, and the end face of the output shaft sleeve 21 facing the first engaging sleeve 31a is provided with an end face tooth structure that meshes with the first engaging sleeve 31a. Similarly, the end face of the connecting shaft 15 facing the second engaging sleeve 31b is provided with an end face tooth structure that meshes with the second engaging sleeve 31b, thereby facilitating the connection or disconnection between the first engaging sleeve 31a and the output shaft sleeve 21, and between the second engaging sleeve 31b and the connecting shaft 15. In the overall structural layout of the power transmission device, the second engaging component 30b and the first engaging component 30a are preferably disposed on the left and right sides of the shaft shoulder 141, and the stop member 142 is preferably disposed in the gap between the right end of the connecting shaft 15 and the input shaft 14 to improve the structural compactness.
[0086] Furthermore, in this embodiment, the first engagement sleeve 31a can be keyed to the input shaft 14 via the first spline 143 and move along the axial direction of the input shaft 14. Similarly, the second engagement sleeve 31b can be keyed to the input shaft 14 via the second spline 144 and move along the axial direction of the input shaft 14. Based on the arrangement of the first spline 143 and the second spline 144, the movement stability of the first engagement sleeve 31a and the second engagement sleeve 31b, as well as the reliability of the transmission connection between the first engagement sleeve 31a and the output shaft sleeve 21, and the reliability of the transmission connection between the second engagement sleeve 31b and the connecting shaft 15, can also be improved.
[0087] Furthermore, the output shaft sleeve 21 can be rotatably mounted in the first housing 20 via the first bearing 211. In the state shown in Figure 1, the left end of the input shaft 14 is connected to the half-shaft gear 11, and the right end of the input shaft 14 is rotatably mounted in the output shaft sleeve 21 via the second bearing 22. Thus, the output shaft sleeve 21 is supported by the first bearing 211, and the right end of the input shaft 14 is supported by the second bearing 22. Simultaneously, to ensure the stability of the connecting shaft 15, it can also be rotatably mounted in the first housing 20 via the third bearing 16.
[0088] Secondly, in actual use, the power transmission device of this embodiment can be configured in an optional manner based on the detachable configuration of the second housing 321 and the keyed connection between the first coupling sleeve 31a, the second coupling sleeve 31b and the input shaft 14. For example, when the function only needs to be disconnected, some components related to the differential lock (locking) function, such as the second housing 321 (i.e. the second drive member 32b) and the second coupling sleeve 31b, can be removed.
[0089] In this embodiment, Figures 6 to 8 show schematic diagrams of force transmission in disconnection mode, differential mode, and locking mode of the power transmission device, respectively. Specifically, in disconnection mode, the first driving member 32a drives the first engaging sleeve 31a to compress the first elastic member 33a to move to the left and away from the output shaft sleeve 21. The driving force transmitted from the half-shaft gear 11 to the input shaft 14 cannot be transmitted to the output shaft sleeve 21 because there is no transmission connection between the first engaging sleeve 31a and the output shaft sleeve 21, so as to realize the disconnection function and thus achieve energy saving.
[0090] In differential mode, the first drive member 32a does not drive the first engagement sleeve 31a to move. The first engagement sleeve 31a is connected to the output shaft sleeve 21 under the elastic push of the first elastic member 33a. The driving force transmitted from the half-shaft gear 11 to the input shaft 14 is transmitted to the output shaft sleeve 21 through the first engagement sleeve 31a, and then to the wheels through the half-shaft, realizing torque transmission. In locking mode, while maintaining the transmission connection between the first engagement sleeve 31a and the output shaft sleeve 21, the second drive member 32b is activated to drive the second engagement sleeve 31b to compress the second elastic member 33b and connect it to the connecting shaft 15. That is, the input shaft 14 is connected to the differential housing, so that the output shaft sleeve 21 and the differential housing rotate synchronously, thereby realizing the locking function (the half-shafts corresponding to the two half-shaft gears 11 rotate synchronously, that is, the corresponding wheels rotate synchronously), improving the vehicle's ability to get out of trouble.
[0091] In this embodiment, the power transmission device, when used as a differential assembly, can achieve differential function through a transmission connection between the first engagement sleeve 31a and the output shaft sleeve 21. It can also achieve disconnection function by disengaging the first engagement sleeve 31a from the output shaft sleeve 21, thereby reducing energy loss and solving the problem of high energy consumption in four-wheel drive vehicles when one drive axle is not engaged, leading to being towed. Simultaneously, it can also achieve locking function through the transmission connection between the first engagement sleeve 31a and the output shaft sleeve 21, and the transmission connection between the second engagement sleeve 31b and the device housing 10, improving the vehicle's off-road capability and overall driving performance. This contributes to improving the product quality of the power transmission device. Furthermore, this power transmission device not only has low design cost, facilitating rapid cost recovery, but also has higher integration, solving the problem of conventional disconnection devices having complex actuators and large space requirements, making them difficult to implement during installation and matching.
[0092] It is worth mentioning that the power transmission device in this embodiment, when used as a differential assembly, can integrate differential, disconnect, and lock functions. However, for some customers who have optional requirements for vehicle power type, it may not be necessary to have differential, disconnect, and lock functions at the same time.
[0093] Therefore, in order to enable optional configuration of the power transmission device in this embodiment, in some other exemplary embodiments, as shown in FIG9, the power transmission device in this embodiment may also include a device housing 10, a half-shaft gear 11 disposed in the device housing 10, an input shaft 14 connected to the half-shaft gear 11, an output shaft sleeve 21 disposed axially along the input shaft 14 and corresponding to the input shaft 14, and a first engagement component 30a disposed on the input shaft 14.
[0094] At this time, the first engagement assembly 30a includes a first engagement sleeve 31a slidably disposed on the input shaft 14, and a first elastic member 33a disposed between the input shaft 14 and the first engagement sleeve 31a. The first engagement sleeve 31a is connected to the output shaft sleeve 21 in a transmission manner, and when the first engagement sleeve 31a is driven to move axially along the input shaft 14, it can compress the first elastic member 33a and move away from the output shaft sleeve 21.
[0095] In a preferred embodiment, the first engagement component 30a further includes a first driving member 32a, which is connected to the first engagement sleeve 31a to drive the first engagement sleeve 31a to move axially along the input shaft 14.
[0096] At this time, with the above configuration, the power transmission device of this embodiment, when used as a differential assembly, can realize the differential function through the transmission connection between the first engagement sleeve 31a and the output shaft sleeve 21, and can realize the disconnection function by disengaging the first engagement sleeve 31a from the output shaft sleeve 21, so as to reduce energy loss.
[0097] In other words, compared to the power transmission device with disconnection mode, differential mode, and locking mode described in the example above, the main difference of the power transmission device in this embodiment is that some components related to the locking function, such as the second engagement component 30b and the connecting shaft 15, are removed. It can only achieve two operating modes: disconnection mode and differential mode. Therefore, it can meet the needs of customers who only require a power transmission device with disconnection and differential functions. Of course, for related structures and functions not mentioned in this embodiment's power transmission device, please refer to the detailed content described above, which will not be repeated here.
[0098] It should be noted that, in addition to the structural form shown in Figure 9, and also for the purpose of implementing optional configurations, in some other exemplary embodiments, as shown in Figure 10, the power transmission device of this embodiment may also include a device housing 10, a half-shaft gear 11 disposed in the device housing 10, an input shaft 14 connected to the half-shaft gear 11, an output shaft sleeve 21 disposed axially along the input shaft 14 and corresponding to the input shaft 14, and a second engagement component 30b disposed on the input shaft 14.
[0099] At this time, the second engagement assembly 30b includes a second engagement sleeve 31b slidably disposed on the input shaft 14, and a second elastic member 33b disposed between the input shaft 14 and the second engagement sleeve 31b. When the second engagement sleeve 31b is driven to move axially along the input shaft 14, it can compress the second elastic member 33b to approach and drive the connection device housing 10.
[0100] In a preferred embodiment, the second engagement assembly 30b further includes a second driving member 32b, which is tractively connected to the second engagement sleeve 31b to drive the second engagement sleeve 31b to move axially along the input shaft 14. Meanwhile, to save costs and improve structural stability, the output shaft sleeve 21 is preferably fixedly connected to the input shaft 14.
[0101] At this time, as configured above, the power transmission device of this embodiment, when used as a differential assembly, can realize the differential function when the second engagement sleeve 31b is disengaged from the transmission connection between it and the device housing 10, and can realize the locking function through the transmission connection between the second engagement sleeve 31b and the device housing 10, thereby improving the vehicle's off-road capability and enhancing the overall vehicle driving performance.
[0102] In other words, compared to the power transmission device with disconnection mode, differential mode, and locking mode mentioned in the example above, the main difference of the power transmission device in this embodiment is that some components related to the disconnection function, such as the first engagement component 30a, are removed, and the output shaft sleeve 21 is fixedly connected to the input shaft 14. It can only realize two working modes: differential mode and locking mode. Therefore, it can meet the needs of customers who only require a power transmission device with differential and locking functions. Of course, for related structures and functions not mentioned in this embodiment's power transmission device, please refer to the detailed content described above, and they will not be repeated here. Example 2
[0103] This embodiment relates to a vehicle, which is equipped with the power transmission device described in Embodiment 1.
[0104] In this embodiment, the vehicle, by setting the power transmission device as in Embodiment 1, can realize differential, disconnection and locking functions when the power transmission device is used as a differential assembly, and has good reliability, so that the whole vehicle has better power transmission performance, thereby improving the overall vehicle quality.
[0105] The above description is merely a preferred embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.
Claims
1. A power transmission device, characterized in that: It includes a device housing (10), a half-shaft gear (11) disposed in the device housing (10), an input shaft (14) connected to the half-shaft gear (11), an output shaft sleeve (21) disposed axially along the input shaft (14) and corresponding to the input shaft (14), and a first engagement assembly (30a) and / or a second engagement assembly (30b) disposed on the input shaft (14). The first engagement assembly (30a) includes a first engagement sleeve (31a) slidably disposed on the input shaft (14). The first engagement sleeve (31a) is driven to move axially along the input shaft (14) and can establish a transmission connection with the output shaft sleeve (21) or disengage from the transmission connection with the output shaft sleeve (21). The second engagement assembly (30b) includes a second engagement sleeve (31b) slidably disposed on the input shaft (14), the second engagement sleeve (31b) being driven to move axially along the input shaft (14) and being able to establish a transmission connection with the device housing (10) or disengage from the transmission connection with the device housing (10).
2. The power transmission device according to claim 1, characterized in that: It also includes a first housing (20) spaced apart from the device housing (10), and the input shaft (14) is provided with both the first engagement component (30a) and the second engagement component (30b). The output shaft sleeve (21) is rotatably disposed in the first housing (20), the first engagement component (30a) and the second engagement component (30b) are both located in the first housing (20), and the second engagement component (30b) is located between the first engagement component (30a) and the device housing (10).
3. The power transmission device according to claim 1, characterized in that: It also includes a first housing (20) spaced apart from the device housing (10), and the output shaft sleeve (21) is rotatably disposed in the first housing (20); The input shaft (14) is provided with the first engagement component (30a), which is located in the first housing (20); or, the input shaft (14) is provided with the second engagement component (30b), which is located in the first housing (20).
4. The power transmission device according to claim 2 or 3, characterized in that: The first engagement assembly (30a) further includes a first drive member (32a), which is convexly connected to the first engagement sleeve (31a) to drive the first engagement sleeve (31a) to move axially along the input shaft (14); The second engagement assembly (30b) further includes a second drive member (32b), which is tractively connected to the second engagement sleeve (31b) to drive the second engagement sleeve (31b) to move axially along the input shaft (14).
5. The power transmission device according to claim 4, characterized in that: Both the first coupling sleeve (31a) and the second coupling sleeve (31b) are provided with a magnetic body (311), and both the first driving member (32a) and the second driving member (32b) include an electromagnetic coil (322) provided on the first housing (20).
6. The power transmission device according to claim 5, characterized in that: Along the axial direction of the input shaft (14), the magnetic body (311) is located on one side of the electromagnetic coil (322); or, Along the radial direction of the input shaft (14), the magnetic body (311) is located between the electromagnetic coil (322) and the input shaft (14).
7. The power transmission device according to claim 5, characterized in that: The input shaft (14) is slidably provided with a magnetic shield (312) corresponding to each of the magnetic bodies (311), and the magnetic bodies (311) are disposed on the magnetic shield (312).
8. The power transmission device according to claim 5, characterized in that: The electromagnetic coil (322) is disposed in the first housing (20) through the second housing (321), and an abutment portion (3211) is provided on the second housing (321). The abutment portion (3211) is used to attract the magnetic body (311) together and limit the movement stroke of the magnetic body (311).
9. The power transmission device according to claim 8, characterized in that: The second housing (321) is provided with locking members (24) on both sides along the axial direction of the input shaft (14), and the second housing (321) is mounted on the first housing (20) by means of the locking members (24) on both sides; or, The inner wall of the first housing (20) is provided with a shoulder (23) and a locking member (24) spaced apart from the shoulder (23). The second housing (321) is located between the shoulder (23) and the locking member (24).
10. The power transmission device according to any one of claims 1 to 3, characterized in that: The first engagement assembly (30a) further includes a first elastic element (33a) disposed between the input shaft (14) and the first engagement sleeve (31a). The first engagement sleeve (31a) is connected to the output shaft sleeve (21) in a driving connection. When the first engagement sleeve (31a) is driven to move axially along the input shaft (14), it can compress the first elastic element (33a) and move away from the output shaft sleeve (21).
11. The power transmission device according to claim 10, characterized in that: The input shaft (14) is provided with a shoulder (141), one end of the first elastic element (33a) is connected to the shoulder (141), and the other end of the first elastic element (33a) is connected to the first coupling sleeve (31a).
12. The power transmission device according to any one of claims 1 to 3, characterized in that: The second engagement assembly (30b) further includes a second elastic element (33b) disposed between the input shaft (14) and the second engagement sleeve (31b), which can compress the second elastic element (33b) when the second engagement sleeve (31b) is driven to move axially along the input shaft (14) to approach and drive the device housing (10).
13. The power transmission device according to claim 12, characterized in that: The input shaft (14) is provided with a detachable stop (142), one end of the second elastic member (33b) is connected to the stop (142), and the other end of the second elastic member (33b) is connected to the second engagement sleeve (31b).
14. The power transmission device according to any one of claims 1 to 3, characterized in that: The second engagement assembly (30b) is provided on the input shaft (14); The device housing (10) has a connecting shaft (15) on the side facing the output shaft sleeve (21). The input shaft (14) passes through the shaft hole of the connecting shaft (15) and is connected to the output shaft sleeve (21) in a driving connection. The second coupling sleeve (31b) is connected to the device housing (10) in a driving connection through the connecting shaft (15).
15. A vehicle, characterized in that: The vehicle is equipped with a power transmission device as described in any one of claims 1 to 14.