Gear shifting device, gear shifting method thereof and vehicle

Abstract

The gear shifting device comprises a shaft, a low-gear gear, a low-gear gear bearing, a driving gear, an electromagnetic coil, an inner spring, an outer spring, a high-gear gear and a high-gear gear bearing, the shaft is sleeved with the low-gear gear through one face of the outer side of the low-gear gear bearing in an empty mode, and the shaft is sleeved with the high-gear gear through one face of the outer side of the high-gear gear bearing in an empty mode. The inner side of the low-gear gear bearing and the inner side of the high-gear gear bearing are attached to the shaft, the driving gear is in clearance connection with the shaft through a spline, dog teeth are arranged at the two ends of the driving gear and meshed with the dog teeth of the high-gear gear or the dog teeth of the low-gear gear respectively, and the electromagnetic coil is fixed to the speed reducer shell. When the electromagnetic coil is electrified, electromagnetic force drives the driving gear to compress the inner spring and the outer spring until the driving gear is meshed with the dog teeth of the high-gear gear, or drives the driving gear to compress the inner spring until the driving gear is separated from the dog teeth of the low-gear gear and the dog teeth of the high-gear gear; the problem that a traditional dog tooth type electromagnetic clutch cannot achieve switching of different gears is solved.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to a gear shifting device and its shifting method, and a vehicle. Background Technology

[0002] In existing technologies, common gear shifting structures are generally complex and costly. Both clutches and synchronizers require sophisticated control, and the shifting process involves slippage, resulting in long shift times. Traditional dog-tooth electromagnetic clutches typically have only two positions, used for disengagement and engagement, and cannot achieve switching between different gears. Summary of the Invention

[0003] This application provides a gear shifting device, a gear shifting method, and a vehicle to solve the problem that traditional dog-tooth electromagnetic clutches cannot achieve gear switching.

[0004] A first aspect of this application provides a gear shifting device, comprising: a shaft, a low-gear gear, a low-gear gear bearing, a drive gear, an electromagnetic coil, a spring seat, an inner spring, an outer spring, a thrust bearing, a high-gear gear, and a high-gear gear bearing. The low-gear gear is loosely fitted onto the shaft via the outer side of the low-gear gear bearing, and the high-gear gear is loosely fitted onto the shaft via the outer side of the high-gear gear bearing. The inner sides of the low-gear bearing and the high-gear bearing are in contact with the shaft. The drive gear is connected to the shaft with a spline and has dog teeth at both ends, which respectively engage with the dog teeth of the high-gear gear or the low-gear gear. The spring seat is loosely fitted on the shaft, and the inner spring and the outer spring are loosely fitted on the inner and outer sides of the spring seat, respectively. The electromagnetic coil is fixed on the reducer housing and is in close contact with the drive gear. When current is applied to the electromagnetic coil, the electromagnetic force drives the drive gear to compress the inner spring and the outer spring until the drive gear meshes with the high-gear's dog teeth, or drives the drive gear to compress the inner spring and move towards the high-gear until the dog teeth of the drive gear disengage from the low-gear and the high-gear's dog teeth. One side of the thrust bearing is in contact with the spring seat, and the other side of the thrust bearing is in contact with the high-gear.

[0005] Optionally, the shifting device further includes an outer spring limiting plate, which is fixed on the shaft to limit the initial position of the outer spring.

[0006] Optionally, both the low-grade gear bearing and the high-grade gear bearing are needle roller bearings.

[0007] Optionally, when no current is applied to the electromagnetic coil, the elastic force of the inner spring pushes the active tooth toward the low gear until the dog teeth of the active tooth mesh with the dog teeth of the low gear, and the outer spring separates from the active tooth.

[0008] Optionally, when the electromagnetic coil is energized with a first preset current, the electromagnetic force drives the active tooth to slide and compress the inner spring axially, the end face of the active tooth contacts the outer spring limiting plate, and the active tooth disengages from the dog teeth of the high-gear and the low-gear respectively.

[0009] Optionally, when a second preset current is applied to the electromagnetic coil, the electromagnetic force drives the active tooth to slide and compress the inner spring and the outer spring until the active tooth meshes with the dog teeth of the high-gear.

[0010] Optionally, the value of the second preset current is greater than the value of the first preset current.

[0011] Optionally, the shifting device further includes a controller, which adjusts the rotational speed of the high-gear when the vehicle shifts from a preset low gear to a preset high gear, until the speed difference between the high-gear and the driving gear is within a preset numerical range.

[0012] A second aspect of this application provides a shifting method for a gear shifting device, comprising: when the current vehicle shifts from the current gear to neutral, passing a first preset current through the electromagnetic coil, the electromagnetic force driving the drive gear to compress the inner spring and move towards the higher gear, until the drive gear contacts the outer spring limiting plate; when the drive gear slides to contact the outer spring limiting plate, the drive gear stops sliding, and the dog teeth at both ends of the drive gear completely disengage from the dog teeth of the low gear and the higher gear, completing the shift from the current gear to neutral; when the current vehicle shifts from the current gear to the preset current, a first preset current is passed through the electromagnetic coil, the electromagnetic force drives the drive gear to compress the inner spring and move towards the higher gear, until the drive gear contacts the outer spring limiting plate; when the current vehicle shifts from the current gear to the preset current, the drive gear stops sliding, and the dog teeth at both ends of the drive gear completely disengage from the dog teeth of the low gear and the higher gear, completing the shift from the current gear to neutral; when the current vehicle shifts from the current gear to the preset current, a first preset current is passed through the electromagnetic coil, the electromagnetic force drives the drive gear to compress the inner spring and move towards the higher gear, until the drive gear contacts the outer spring limiting plate, the drive gear stops sliding, and the dog teeth at both ends of the drive gear completely disengage from the low gear and the higher gear, completing the shift from the current gear to neutral; when the current vehicle shifts from the current gear to the preset current, a first preset current is passed through the electromagnetic coil, the electromagnetic force drives the drive gear to compress the inner spring and move towards the higher gear, until the drive gear contacts the outer spring limiting plate, ... When the gear is set to a high gear, a second preset current is supplied to the electromagnetic coil. The electromagnetic force drives the active gear to compress the inner spring and the outer spring until the active gear engages with the high gear's dog teeth, completing the shift from the current gear to the preset high gear. When the vehicle shifts from the current gear to the preset low gear, the current to the electromagnetic coil is cut off. The elasticity of the inner spring pushes the active gear to engage with the low gear's dog teeth, and the outer spring separates from the active gear, completing the shift from the current gear to the preset low gear. A third aspect of this application provides a vehicle including the aforementioned gear shifting device.

[0013] In the above embodiment, the low-gear is loosely fitted onto the shaft via the outer side of the low-gear bearing, and the high-gear is loosely fitted onto the shaft via the outer side of the high-gear bearing. The inner sides of the low-gear and high-gear bearings are in contact with the shaft. The driving gear is connected to the shaft with a gap via a spline. Each end of the driving gear has a dog tooth, which meshes with the dog tooth of either the high-gear or low-gear gear. A spring seat is loosely fitted onto the shaft, with an inner spring and an outer spring loosely fitted on the inner and outer sides of the spring seat, respectively. The electromagnetic coil is fixed to the reducer housing and is in close contact with the driving gear. When current is applied to the electromagnetic coil, the electromagnetic force drives the driving gear to compress the inner and outer springs until the driving gear meshes with the dog tooth of the high-gear gear, or drives the driving gear to compress the inner spring and move towards the high-gear gear until the dog teeth of the driving gear disengage from both the low-gear and high-gear gears. This solves the problem of traditional dog-tooth electromagnetic clutches being unable to switch between different gears. By applying current and cooperating with the springs, different gears can be switched. The overall structure is compact, easy to control, quick to shift gears, and low in cost.

[0014] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0015] The above or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which: Figure 1 This is a schematic diagram of a gear shifting device according to an embodiment of this application; Figure 2 This is a schematic diagram of the structure of the low-end position according to an embodiment of this application; Figure 3 This is a structural schematic diagram of the neutral position provided according to an embodiment of this application; Figure 4 This is a schematic diagram of the structure of the high-end position according to an embodiment of this application; Figure 5 This is a flowchart of a shifting method using a shifting device according to an embodiment of this application. Detailed Implementation

[0016] The embodiments of this application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0017] The following description, with reference to the accompanying drawings, describes a gear shifting device, gear shifting method, and vehicle according to embodiments of this application. Addressing the problem mentioned in the background art that traditional dog-tooth electromagnetic clutches cannot achieve gear switching, this application provides a gear shifting device. In this device, a low-gear gear is loosely fitted onto a shaft via the outer side of a low-gear bearing, and a high-gear gear is loosely fitted onto the shaft via the outer side of a high-gear bearing. The inner sides of both the low-gear and high-gear bearings are in contact with the shaft. A drive gear is connected to the shaft via a spline with clearance. Both ends of the drive gear are provided with dog teeth, which mesh with the dog teeth of the high-gear gear or the low-gear gear, respectively. The spring seat is fitted onto the shaft with a gap. The inner and outer springs are loosely fitted inside and outside the spring seat, respectively. The electromagnetic coil is fixed to the reducer housing and is in close contact with the drive gear. When current is applied to the electromagnetic coil, the electromagnetic force drives the drive gear to compress the inner and outer springs until the drive gear meshes with the high-gear's dog teeth, or drives the drive gear to compress the inner spring and move towards the high-gear until the dog teeth of the drive gear disengage from both the low-gear and high-gear gears. One side of the thrust bearing is in contact with the spring seat, and the other side of the thrust bearing is in contact with the high-gear. This solves the problem of traditional dog-tooth electromagnetic clutches being unable to switch between different gears. By applying current and cooperating with the springs, different gears can be switched. The overall structure is compact, easy to control, quick to shift gears, and low in cost.

[0018] Specifically, Figure 1 This is a schematic diagram of a gear shifting device provided in an embodiment of this application.

[0019] like Figure 1 As shown, the gear shifting device includes: shaft 1, low gear 3, low gear bearing 2, drive gear 4, electromagnetic coil 5, spring seat 7, inner spring 8, outer spring 9, thrust bearing 10, high gear 11, and high gear bearing 12.

[0020] The input end of shaft 1 is connected to the motor, and the output end of shaft 1 is connected to the load end of the reducer. The low-gear 3 is loosely fitted onto shaft 1 via the outer side of the low-gear bearing 2, and the high-gear 11 is loosely fitted onto shaft 1 via the outer side of the high-gear bearing 12. The inner sides of the low-gear bearing 2 and the high-gear bearing 12 are in contact with shaft 1. The driving gear 4 is loosely connected to shaft 1 via a spline. Both ends of the driving gear 4 are provided with dog teeth, which mesh with the dog teeth of the high-gear 11 or the low-gear 3, respectively. The spring seat 7 is loosely fitted onto shaft 1, and the inner spring 8... The inner and outer springs 9 are respectively loosely fitted inside and outside the spring seat 7. The electromagnetic coil 5 is fixed on the reducer housing and is in close contact with the drive gear 4. When current is applied to the electromagnetic coil 5, the drive gear 4 is driven to compress the inner spring 8 and the outer spring 9 until the drive gear 4 meshes with the dog teeth of the high-end gear 11, or the drive gear 4 is driven to compress the inner spring 8 and move towards the high-end gear 11 until the dog teeth of the drive gear 4 disengage from the dog teeth of the low-end gear 3 and the high-end gear 11. One side of the thrust bearing 10 is in contact with the spring seat 7, and the other side of the thrust bearing 10 is in contact with the high-end gear 11.

[0021] In some embodiments, both the low-grade gear bearing 2 and the high-grade gear bearing 12 are needle roller bearings.

[0022] Optionally, in some embodiments, the shifting device further includes an outer spring limiting plate 6, which is fixed on the shaft 1 to limit the initial position of the outer spring 9.

[0023] Specifically, the shifting device of the multi-speed pure electric reducer in this application is as follows: Figure 1 As shown, the structure includes shaft 1, low-gear 3, low-gear bearing 2, drive gear 4, electromagnetic coil 5, spring seat 7, inner spring 8, outer spring 9, thrust bearing 10, high-gear 11, and high-gear bearing 12. High-gear 11 and low-gear 3 are loosely fitted onto the shaft via needle roller bearings. Drive gear 4 is connected to the input shaft of shaft 1 with a gap via a spline. Spring seat 7 is loosely fitted onto shaft 1. Inner spring 8 and outer spring 9 are loosely fitted onto the inner and outer sides of spring seat 7, respectively. Electromagnetic coil 5 is fixed to the housing. One side of thrust bearing 10 is in contact with spring seat 7, and the other side is in contact with high-gear 11.

[0024] The drive gear 4 is in contact with the shaft 1 through the spline clearance. The drive gear 4 can slide axially on the shaft 1 and transmit torque through the spline.

[0025] The electromagnetic coil 5 is fixed to the housing and fits in close contact with the driving tooth 4 with a small gap. When energized, it can drive the driving tooth to move axially, causing the driving tooth 4 to compress the inner spring 8 and / or the outer spring 9 until the electromagnetic force and the spring force are balanced, thus stabilizing the driving tooth 4 in different positions. When different currents are applied to the electromagnetic coil 5, the stable position of the driving tooth 4 is different. It should be noted that the functions of the inner spring 8 and the outer spring 9 are interchangeable. For example, different features can be designed on the drive gear 4 so that it contacts the outer spring 9 in low gear; compresses the outer spring 9 in neutral gear, making it just contact with the inner spring 8, but without any interaction force; and compresses both the inner spring 8 and the outer spring 9 simultaneously in high gear. The function of the outer spring 9 is to create a significant difference in electromagnetic force between neutral and high gear, which facilitates the calibration and control of the current and electromagnetic force of the electromagnetic coil 5. If the calibration is precise, the electromagnetic force on the drive gear 4 can be controlled within a small fluctuation range, and the outer spring 9 and its outer spring limiting plate 6 can also be eliminated.

[0026] Optionally, in some embodiments, when no current is applied to the electromagnetic coil 5, the elastic force of the inner spring 8 pushes the active tooth 4 to move toward the low gear 3 until the dog teeth of the active tooth 4 mesh with the dog teeth of the low gear 3, and the outer spring 9 separates from the active tooth 4.

[0027] The driving gear 4 has dog teeth at both ends, which respectively engage with the dog teeth on the end faces of the high-gear 11 and the low-gear 3. When the electromagnetic coil is not energized, the driving gear 4 meshes with the dog teeth of the low-gear 3. At this time, the low-gear 3 synchronizes its rotational speed with that of shaft 1 through the driving gear 4, and the system is in a low-gear state (e.g., Figure 2 (As shown in the image), this is also the initial position of the gear shifting device.

[0028] In low gear, the electromagnetic force is 0, the inner spring 8 contacts the end face of the drive gear 4, driving the drive gear 4 to move closer to the low gear 3, so that the shifting device is stable in low gear.

[0029] Optionally, in some embodiments, when the electromagnetic coil 5 is energized with a first preset current, the electromagnetic force drives the active tooth 4 to slide and compress the inner spring 8 along the shaft 1, the end face of the active tooth 4 contacts the outer spring limiting plate 6, and the active tooth 4 disengages from the dog teeth of the high-gear 11 and the low-gear 3 respectively.

[0030] When a small current (i.e., the first preset current) flows through the electromagnetic coil 5, the electromagnetic force drives the drive gear 4 to compress the inner spring 8. When the two are balanced, the drive gear 4 is stable in the middle position. At this time, the dog teeth on its end face disengage from the dog teeth of the high-gear 11 and the low-gear 3. The high-gear 11 and the low-gear 3 are disengaged from the shaft 1, and the system is in neutral (e.g., ...). Figure 3 (As shown).

[0031] When in neutral, the electromagnetic force drives the drive gear 4 to compress the inner spring 8. When the two are in balance, the drive gear 4 just moves to contact the outer spring limiting plate 6, but is not subjected to the pressure of the outer spring 8.

[0032] Optionally, in some embodiments, when a second preset current is applied to the electromagnetic coil 5, the electromagnetic force drives the active gear 4 to slide and compress the inner spring 8 and the outer spring 9 until the active gear 4 engages with the dog teeth of the high-gear 11.

[0033] In some embodiments, the value of the second preset current is greater than the value of the first preset current.

[0034] When a large current (i.e., the second preset current) flows through the electromagnetic coil, the electromagnetic force drives the active gear 4 to slide and compress the inner spring 8 and the outer spring 9. The active gear 5 meshes with the dog teeth of the high-speed gear 11. At this time, the high-speed gear 11 synchronizes its rotational speed with that of the shaft 1 through the active gear 4, and the system is in the high-speed state (e.g., Figure 4 (As shown).

[0035] At the higher position, a greater electromagnetic force drives the drive gear to move further. At this time, the inner spring 8 and the outer spring 9 will be compressed together. When the electromagnetic force and the spring force are balanced, it stabilizes at the higher position.

[0036] Optionally, in some embodiments, the shifting device further includes a controller that adjusts the rotational speed of the high gear 11 when the vehicle shifts from a preset low gear to a preset high gear until the speed difference between the high gear 11 and the drive gear 4 is within a preset range.

[0037] To achieve the engagement of high and low gears, a suitable speed difference is required between the drive gear 4 and the gear position gear. Generally, the gear position gear is connected to the input motor, and the shaft is connected to the reducer output (such as the differential) or the wheel. If the gear is currently in a low gear, the drive gear 4 and the low gear 3 rotate synchronously. To switch to a higher gear, the electromagnetic coil 5 carries a large current, generating an electromagnetic force that drives the drive gear 4 towards the high gear 11. When the drive gear 4 disengages from the low gear 3, the controller needs to adjust the speed of the high gear 11 via the motor to ensure that the speed difference between the high gear 11 and the drive gear 4 is within a reasonable range. Only then can the electromagnetic force drive the drive gear 4 to move further towards the high gear 11, allowing the two gears to engage smoothly and enabling the shift from a low gear to a high gear.

[0038] In actual vehicle use, there are also regenerative braking conditions. In this case, the drive motor acts as a generator, and the reverse-trailer wheels generate electricity. The control system can connect the shifting device to a specific gear according to the actual needs of the vehicle, thereby optimizing the power generation efficiency.

[0039] According to an embodiment of this application, a gear shifting device is provided, and the gear shifting method of the gear shifting device is shown in Table 1.

[0040] Table 1

[0041] Specifically, as shown in Table 1 and Figure 2As shown, when the vehicle switches from the current gear to the preset low gear, the current to the electromagnetic coil 5 is cut off, the elastic force of the inner spring 8 pushes the drive gear 4 to mesh with the dog teeth of the low gear 3, and the outer spring 9 separates from the drive gear 4, thus completing the switch from the current gear to the low gear.

[0042] As shown in Table 1 and Figure 3 As shown, when the vehicle shifts from the current gear to neutral, a small current is supplied to the electromagnetic coil 5. The electromagnetic force drives the drive gear 4 to compress the inner spring 8 and move towards the high gear 11 until the drive gear 4 contacts the outer spring limiting plate 6. When the drive gear 4 slides to contact the outer spring limiting plate 6, the drive gear 4 stops sliding, and the dog teeth at both ends of the drive gear 4 completely disengage from the dog teeth of the low gear 2 and the high gear 11, completing the shift from the current gear to neutral.

[0043] As shown in Table 1 and Figure 4 As shown, when the vehicle shifts from the current gear to the higher gear, a large current is supplied to the electromagnetic coil 5. The electromagnetic force drives the drive gear 4 to compress the inner spring 8 and the outer spring 9 until the drive gear 4 meshes with the dog teeth of the higher gear 11, thus completing the shift from the current gear to the higher gear.

[0044] According to the shifting device proposed in this application embodiment, the low-gear gear is loosely fitted onto the shaft through the outer side of the low-gear bearing, and the high-gear gear is loosely fitted onto the shaft through the outer side of the high-gear bearing. The inner sides of the low-gear bearing and the high-gear bearing are in contact with the shaft. The driving gear is connected to the shaft with a gap through a spline. The two ends of the driving gear are respectively provided with dog teeth, which mesh with the dog teeth of the high-gear gear or the low-gear gear. The spring seat is loosely fitted onto the shaft. The inner spring and the outer spring are loosely fitted onto the inner and outer sides of the spring seat, respectively. The electromagnetic coil is fixed on the reducer housing and is in close contact with the driving gear. When current is applied to the electromagnetic coil, the electromagnetic force drives the driving gear to compress the inner spring and the outer spring until the driving gear meshes with the dog teeth of the high-gear gear, or drives the driving gear to compress the inner spring and move towards the high-gear gear until the dog teeth of the driving gear disengage from the dog teeth of the low-gear gear and the high-gear gear. One side of the thrust bearing is in contact with the spring seat, and the other side of the thrust bearing is in contact with the high-gear gear. This solves the problem that traditional dog-tooth electromagnetic clutches cannot switch between different gears. By applying current and working with a spring, different gears can be switched, achieving stability and balance in different gear positions. The overall structure is compact, easy to control, quick to shift gears, and low in cost.

[0045] Next, referring to the accompanying drawings, a shifting method of the shifting device according to an embodiment of this application is described.

[0046] Figure 5 This is a schematic diagram of a shifting method of a shifting device according to an embodiment of this application.

[0047] like Figure 5As shown, the shifting method of this shifting device includes the following steps: In step S501, when the current vehicle shifts from the current gear to neutral, a first preset current is supplied to the electromagnetic coil. The electromagnetic force drives the active gear to compress the inner spring and move towards the high gear until the active gear contacts the outer spring limiting plate. When the active gear slides to contact the outer spring limiting plate, the active gear stops sliding, and the dog teeth at both ends of the active gear completely disengage from the low gear and the high gear, completing the shift from the current gear to neutral.

[0048] In step S502, when the current vehicle switches from the current gear to the preset higher gear, a second preset current is supplied to the electromagnetic coil. The electromagnetic force drives the active gear to compress the inner and outer springs until the active gear meshes with the dog teeth of the higher gear, thus completing the switch from the current gear to the preset higher gear.

[0049] In step S503, when the current vehicle switches from the current gear to the preset low gear, the current of the electromagnetic coil is cut off, the elastic force of the inner spring pushes the active gear to mesh with the dog teeth of the low gear, and the outer spring separates from the active gear, thus completing the switch from the current gear to the preset low gear.

[0050] It should be noted that the foregoing explanation of the shifting device embodiment also applies to the shifting method of the shifting device in this embodiment, and will not be repeated here.

[0051] According to the shifting method of the shifting device proposed in this application embodiment, when the current vehicle shifts from the current gear to neutral, a first preset current is supplied to the electromagnetic coil. The electromagnetic force drives the active tooth to compress the inner spring and move towards the higher gear until the active tooth contacts the outer spring limiting plate. When the active tooth slides to contact the outer spring limiting plate, the active tooth stops sliding, and the dog teeth at both ends of the active tooth completely disengage from the low gear and the dog teeth of the higher gear, completing the shift from the current gear to neutral. When the current vehicle shifts from the current gear to a preset higher gear, a second preset current is supplied to the electromagnetic coil. The electromagnetic force drives the active tooth to compress the inner spring and the outer spring until the active tooth meshes with the dog teeth of the higher gear, completing the shift from the current gear to the preset higher gear. When the current vehicle shifts from the current gear to a preset lower gear, the current to the electromagnetic coil is cut off. The elastic force of the inner spring pushes the active tooth to mesh with the dog teeth of the lower gear, and the outer spring separates from the active tooth, completing the shift from the current gear to the preset lower gear. This solves the problem that traditional dog-tooth electromagnetic clutches cannot switch between different gears. By applying different currents and cooperating with springs, the switching between neutral, high gear and low gear is achieved. The control is simple and the gear shifting is fast.

[0052] This application also provides a vehicle that includes the aforementioned gear shifting device.

[0053] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0054] Furthermore, the terms "first" and "second" are descriptive only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0055] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more N executable instructions implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0056] The logic or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequential list of executable instructions that implement logical functions, and can be specifically implemented in any computer program product for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer program product" can be any means that can contain, store, communicate, propagate, or transmit a program for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples of computer program products (a non-exhaustive list) include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and programmable read-only memory (EPROM or flash memory), fiber optic device, and portable optical disc read-only memory (CDROM). Furthermore, the computer program product can even be paper or other suitable medium on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0057] It should be understood that the various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits with logic gates that implement logic functions for data signals, application-specific integrated circuits (ASICs) with suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0058] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer program product, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0059] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer program product.

[0060] The computer program product mentioned above may be a read-only memory, a disk, or an optical disk, etc. Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A gear shifting device, characterized in that, include: Shaft, low-gear, low-gear bearing, drive gear, electromagnetic coil, spring seat, inner spring, outer spring, thrust bearing, high-gear, high-gear bearing, among which, The low-gear is loosely fitted onto the shaft via the outer side of the low-gear bearing, and the high-gear is loosely fitted onto the shaft via the outer side of the high-gear bearing. The inner sides of the low-gear bearing and the high-gear bearing are in contact with the shaft. The driving gear is connected to the shaft with clearance via a spline. Both ends of the driving gear are provided with dog teeth, which mesh with the dog teeth of the high-gear and / or the low-gear, respectively. The spring seat is loosely fitted onto the shaft, and the inner spring and the outer spring are loosely fitted onto the inner and outer sides of the spring seat, respectively. The electromagnetic coil is fixed to the reducer housing and is in close contact with the drive gear. When current is applied to the electromagnetic coil, the electromagnetic force drives the drive gear to compress the inner spring and the outer spring until the drive gear meshes with the dog teeth of the high-gear, or drives the drive gear to compress the inner spring and move towards the high-gear until the dog teeth of the drive gear disengage from the dog teeth of the low-gear and the high-gear. One side of the thrust bearing is in contact with the spring seat, and the other side of the thrust bearing is in contact with the high-gear.

2. The apparatus according to claim 1, characterized in that, Also includes: An outer spring limiting plate is fixed on the shaft to limit the initial position of the outer spring.

3. The apparatus according to claim 1, characterized in that, Both the low-grade gear bearing and the high-grade gear bearing are needle roller bearings.

4. The apparatus according to claim 1, characterized in that, When the electromagnetic coil is not energized, the elastic force of the inner spring pushes the active tooth to move toward the low gear until the dog teeth of the active tooth mesh with the dog teeth of the low gear, and the outer spring separates from the active tooth.

5. The apparatus according to claim 1, characterized in that, When a first preset current is applied to the electromagnetic coil, the electromagnetic force drives the active tooth to slide and compress the inner spring axially. The end face of the active tooth contacts the outer spring limiting plate, and the active tooth disengages from the dog teeth of the high-gear and the low-gear respectively.

6. The apparatus according to claim 1, characterized in that, When a second preset current is applied to the electromagnetic coil, the electromagnetic force drives the active tooth to slide and compress the inner spring and the outer spring until the active tooth meshes with the dog teeth of the high-gear.

7. The apparatus according to any one of claims 5-6, characterized in that, The value of the second preset current is greater than the value of the first preset current.

8. The apparatus according to claim 1, characterized in that, Also includes: The controller adjusts the speed of the high-speed gear when the vehicle switches from a preset low gear to a preset high gear, until the speed difference between the high-speed gear and the driving gear is within a preset range.

9. A vehicle, characterized in that, Includes the shifting device as described in any one of claims 1-8.

10. A shifting method for a shifting device, characterized in that, Applied to the shifting device as described in any one of claims 1-8, wherein the method comprises: When the vehicle shifts from the current gear to neutral, a first preset current is supplied to the electromagnetic coil. The electromagnetic force drives the active gear to compress the inner spring and move towards the higher gear until the active gear contacts the outer spring limiting plate. When the active gear slides to contact the outer spring limiting plate, the active gear stops sliding, and the dog teeth at both ends of the active gear completely disengage from the dog teeth of the low gear and the higher gear, completing the shift from the current gear to neutral. When the vehicle shifts from the current gear to a preset higher gear, a second preset current is supplied to the electromagnetic coil. The electromagnetic force drives the active gear to compress the inner spring and the outer spring until the active gear meshes with the dog teeth of the higher gear, thus completing the shift from the current gear to the preset higher gear. When the vehicle shifts from the current gear to the preset low gear, the current to the electromagnetic coil is cut off, the elastic force of the inner spring pushes the drive gear to mesh with the dog teeth of the low gear, and the outer spring separates from the drive gear, thus completing the shift from the current gear to the preset low gear.

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