Two-gear gearbox and power system

Abstract

The utility model provides a two-gear speed changing box and a power system. The two-gear speed changing box comprises two input shafts and two output shafts, wherein the two input shafts are respectively connected with two motors in a one-to-one correspondence manner; the first input shaft is in transmission with the output shaft through the first gear and the second gear; the second input shaft is in transmission with the intermediate shaft through the first-stage speed reducer; the intermediate shaft is in transmission with the output shaft through the two-gear speed change unit; the gear shifting executing mechanism is used for switching gears of the two-gear speed changing unit; the size of the gear shifting executing mechanism is far smaller than that of a clutch, and when the clutch is adopted for switching, other corresponding accessories need to be added; and the gearbox provided by the utility model only needs the gear shifting executing mechanism with a small size, so that the complexity and the size of the whole vehicle are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of vehicles, and more specifically, particularly relates to a two-speed gearbox and a power system. Background Art

[0002] With the increasing global attention to environmental protection and energy efficiency, automotive technology has experienced rapid development and innovation. The continuous advancement of automotive technology has not only promoted the innovation of power systems, but also brought significant improvements to driving experience, safety and environmental sustainability. With the continuous evolution of technology, future cars will be more intelligent, efficient and environmentally friendly.

[0003] At present, the existing technology provides a power system of a dual-motor electric vehicle, which can make the vehicle more flexible to adapt to different road conditions and obtain better driving comfort and economy. The power system requires a first drive motor, a second drive motor, a controller, a two-speed gearbox, a drive axle, a single-stage reducer and a dog clutch to realize the power source switching between the two drive motors.

[0004] However, the provision of a dog clutch and its corresponding matching accessories for switching the power source between the two drive motors increases the complexity of control. Utility Model Content

[0005] In view of this, an object of the present invention is to provide a two-speed gearbox and a power system for reducing the complexity and volume of the entire vehicle.

[0006] The first aspect of the present application discloses a two-speed gearbox, comprising: a primary reduction device, a shift actuator, a two-speed transmission unit, an output shaft, an intermediate shaft, two input shafts and a plurality of gears;

[0007] The two input shafts are respectively connected to the two motors in a one-to-one correspondence;

[0008] The first input shaft is driven by the output shaft through the first gear and the second gear;

[0009] The second input shaft is driven by the intermediate shaft through a primary reduction device;

[0010] The intermediate shaft is transmitted to the output shaft via a two-speed transmission unit;

[0011] The gear shift actuator is used to switch the gear position of the two-speed transmission unit.

[0012] Optionally, the first gear is arranged on the first input shaft;

[0013] The second gear is disposed on the output shaft;

[0014] The first gear and the second gear are meshed.

[0015] Optionally, the primary reduction device comprises: a third gear and a fourth gear;

[0016] The third gear is disposed on the second input shaft;

[0017] The fourth gear is arranged on the intermediate shaft;

[0018] The third gear is meshed with the fourth gear.

[0019] Optionally, the two-speed transmission unit includes: a fifth gear, a sixth gear, a seventh gear and an eighth gear;

[0020] The intermediate shaft is transmitted to the output shaft via the fifth gear, the sixth gear, the seventh gear and the eighth gear.

[0021] Optionally, the fifth gear is arranged on the intermediate shaft;

[0022] The sixth gear is arranged on the output shaft;

[0023] The fifth gear is meshed with the sixth gear.

[0024] Optionally, the seventh gear is arranged on the intermediate shaft;

[0025] The eighth gear is arranged on the output shaft;

[0026] The seventh gear is meshed with the eighth gear.

[0027] Optionally, when the gear shift actuator performs a first gear shift operation, the gear shift actuator is combined with the sixth gear.

[0028] Optionally, when the gear shift actuator performs a second gear shift operation, the gear shift actuator is combined with the eighth gear.

[0029] A second aspect of the present application discloses a power system, comprising: two motors and a two-speed gearbox as described in any one of the first aspects of the present application;

[0030] The first motor is connected to the first input shaft of the two-speed gearbox;

[0031] The second motor is connected to the second input shaft of the two-speed gearbox;

[0032] The output shaft of the two-speed gearbox is connected to the rear axle.

[0033] Optionally, the first motor and the second motor are motors of the same size; or, the first motor and the second motor are motors of different sizes.

[0034] It can be seen from the above technical solution that the utility model provides a two-speed gearbox, comprising: two input shafts connected to two motors one by one; the first input shaft is transmitted to the output shaft through the first gear and the second gear; the second input shaft is transmitted to the intermediate shaft through the primary reduction device; the intermediate shaft is transmitted to the output shaft through the two-speed transmission unit; the shift actuator is used to switch the gear of the two-speed transmission unit; the size of the shift actuator is much smaller than the clutch, and when the clutch is used for switching, other corresponding accessories need to be added, while the gearbox provided by the present application only requires a smaller shift actuator, thereby reducing the complexity and size of the entire vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 It is a schematic diagram of a two-speed gearbox provided by an embodiment of the utility model;

[0037] Figure 2 It is a schematic diagram of another two-speed gearbox provided by an embodiment of the utility model;

[0038] Figure 3 It is a schematic diagram of another two-speed gearbox provided by an embodiment of the utility model;

[0039] Figure 4 It is a schematic diagram of a power system provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] In the present application, the term "comprise", "include" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements defined by the sentence "comprise one ..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements. In addition, the terms "first", "second", "third", "fourth", etc. (if present) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable in appropriate circumstances, so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here, for example.

[0042] The embodiment of the present application provides a two-speed gearbox, which is used to solve the problem in the prior art that a dog clutch is provided to switch the power source between two drive motors, thereby increasing the complexity of control.

[0043] See also Figure 1 The two-speed gearbox includes: a primary reduction device 40, a shift actuator 60, a two-speed transmission unit 50, an output shaft Z2, an intermediate shaft Z3, two input shafts (such as Figure 1 Z1 and Z4 shown) and multiple gears (such as Figure 1 1 and 2 shown).

[0044] The two input shafts are connected to the two motors in a one-to-one correspondence.

[0045] Specifically, the first input shaft Z1 is connected to the first motor 10, and the second input shaft Z4 is connected to the second motor 20. That is, the first motor 10 is driven by the first input shaft Z1, and the second motor 20 is driven by the second input shaft Z4.

[0046] The first input shaft Z1 is driven by the output shaft Z2 through the first gear 1 and the second gear 2 .

[0047] That is to say, the relationship between the first gear 1 and the second gear 2 can be a master-slave relationship; one of the first gear 1 and the second gear 2 serves as a driven gear; the other gear of the first gear 1 and the second gear 2 serves as a driving gear; the driving gear drives the driven gear to transmit, thereby realizing power transmission.

[0048] The second input shaft Z4 is driven by the intermediate shaft Z3 through the primary reduction device 40 .

[0049] The primary reduction device 40 is a transmission device that changes the rotation speed to meet certain requirements and is used to adjust the speed.

[0050] When the motor is directly connected to the equipment, once the equipment suddenly fails and stops working or the speed of the equipment suddenly increases uncontrollably, the motor cannot adapt to such changes and is prone to damage. Therefore, a reduction device is usually connected between the motor and the equipment to avoid motor damage caused by equipment failure.

[0051] The reduction gear can be divided into primary reduction gear and secondary reduction gear. The main purpose of grading the reduction gear is to distribute the transmission ratio more reasonably.

[0052] The primary reduction device 40 can be a gear reducer, that is, it can rely on a multi-stage gear combination drive to form a reduction ratio, reduce speed, increase torque and other performance; the primary reduction is composed of a plurality of large and small gear meshing drives. The primary reducer is the core, and its speed change is significant and accurate, simple, easy to operate, safe and reliable, long usable time, and easy to maintain.

[0053] The intermediate shaft Z3 is driven by the output shaft Z2 via a two-speed transmission unit 50 .

[0054] That is, the two-speed change unit 50 transmits power between the intermediate shaft Z3 and the output shaft Z2.

[0055] The output shaft Z2 is connected to the rear axle 30, which is a rear drive shaft component of the vehicle power transmission. It consists of two half-bridges and can implement half-bridge differential movement.

[0056] The shift actuator 60 is used to switch the gear position of the two-speed transmission unit 50 .

[0057] The shift actuator 60 is controlled by the automatic transmission adjustment system. Specifically, the shift actuator 60 performs a shift operation according to a TCU (Transmission Control Unit) instruction issued by the automatic transmission adjustment system. Specifically, when the TCU instruction is a first instruction, the shift actuator 60 performs a first shift operation, and causes the corresponding motor to shift into the first gear through the two-speed transmission unit 50; when the TCU instruction is a second instruction, the shift actuator 60 performs a second shift operation, and causes the corresponding motor to shift into the second gear through the two-speed transmission unit 50.

[0058] Specifically, the gear position and the input switching of the single motor and the dual motors are controlled by the shift actuator 60 to better meet the power and economy requirements of the vehicle.

[0059] The two-speed reduction gearbox can be applied to new energy buses, and of course can also be applied to other types of vehicles. We will not elaborate on them here one by one. It depends on the actual situation and is within the protection scope of this application.

[0060] It should be noted that, according to the above description, the first motor 10 and the output shaft Z2 are in a constant meshing state, that is, the first motor 10 does not shift gears and is always in one gear, and the output of the first motor 10 remains unchanged; and the second motor 20 transmits power to the output shaft Z2 through the two-speed transmission unit 50 and the shift actuator 60, so that the second motor 20 can have two gears, that is, the second motor 20 can be in the first gear or the second gear.

[0061] The second motor 20 can select the first gear or the second gear after the first-stage deceleration (the first-stage deceleration device 40). When the whole vehicle is climbing, the second motor 20 outputs in the first gear. When the whole vehicle is in high-speed operation, the second motor 20 outputs in the second gear. The first motor 10 is always in one gear and has a stable output.

[0062] When the second motor 20 is shifting, the first motor 10 can maintain the power requirements of the entire vehicle and improve the comfort of the entire vehicle.

[0063] That is to say, since the two-speed gearbox can be connected to two motors, uninterrupted power can be achieved during the gear shifting operation; wherein, uninterrupted power means that when the gear shifting operation is performed, the powertrain still has power to output to maintain the power requirements of the entire vehicle; it can ensure the continuity of the vehicle's power output when the gear shifting operation is performed, effectively solving the problem of power interruption that may occur during the traditional gear shifting process.

[0064] At the same time, when a motor fails, the other motor can be used to maintain the basic power requirements of the vehicle, improving the stability and reliability of the power system.

[0065] Specifically, when the first motor 10 fails, the MCU (Microcontroller Unit) detects and reports the fault to the VCU (Vehicle control unit VCU), the VCU reports and processes the fault, and at the same time transmits instructions to the MCU to cancel the enablement of the first motor 10. The whole vehicle is driven by the second motor 20. When climbing a slope, the second motor 20 is in the first gear, and in the high-speed condition, the second motor 20 is in the second gear.

[0066] When the second motor 20 fails, the MCU detects and reports the fault to the VCU. The VCU reports and processes the fault and transmits instructions to the MCU to cancel the enablement of the second motor 20. The entire vehicle is driven by the first motor 10 without any gear change.

[0067] Therefore, when a single motor fails, the entire vehicle will not be able to ensure uninterrupted shifting power.

[0068] In this embodiment, the two input shafts are connected to the two motors in a one-to-one correspondence; the first input shaft Z1 is transmitted to the output shaft Z2 through the first gear 1 and the second gear 2; the second input shaft Z4 is transmitted to the intermediate shaft Z3 through the primary reduction device 40; the intermediate shaft Z3 is transmitted to the output shaft Z2 through the two-speed transmission unit 50; the shift actuator 60 is used to switch the gear of the two-speed transmission unit 50; the volume of the shift actuator 60 is much smaller than the clutch, and when the clutch is used for switching, other corresponding accessories need to be added; and the gearbox provided in the present application only requires a smaller shift actuator 60, which reduces the complexity and volume of the entire vehicle.

[0069] Optionally, the first gear 1 is arranged on the first input shaft Z1.

[0070] The second gear 2 is disposed on the output shaft Z2.

[0071] The first gear 1 and the second gear 2 are meshed with each other.

[0072] That is, the first motor 10 transmits power to the output shaft Z2 through the first input shaft Z1, the first gear 1 and the second gear 2. More specifically, the first motor 10 transmits power to the output shaft Z2 through the first input shaft Z1, the first gear 1 and the second gear 2 in sequence, and then transmits power to the rear axle 30.

[0073] For example, the power of the first motor 10 drives the first input shaft Z1 to transmit, and the first gear 1 arranged on the first input shaft Z1 rotates, and the first gear 1 drives the second gear 2 to rotate; the second gear 2 drives the output shaft Z2 to rotate, thereby realizing the power transmission between the first input shaft Z1 and the output shaft Z2. Here, the first input shaft Z1 drives the output shaft Z2 to rotate as an example for explanation, and the output shaft Z2 drives the first input shaft Z1 to rotate similarly to the above transmission process, which will not be repeated here one by one.

[0074] It should be noted that the first gear 1 and the second gear 2 also constitute a primary reduction gear.

[0075] Optional, see Figure 2 The above-mentioned first-stage reduction device 40 includes: a third gear 3 and a fourth gear 4.

[0076] The third gear 3 is arranged on the second input shaft Z4; the fourth gear 4 is arranged on the intermediate shaft Z3.

[0077] The third gear 3 and the fourth gear 4 are meshed.

[0078] That is to say, the second motor 20 transmits power to the intermediate shaft Z3 through the second input shaft Z4, the third gear 3 and the fourth gear 4.

[0079] For example, the power of the second motor 20 drives the second input shaft Z4 to transmit, and the third gear 3 arranged on the second input shaft Z4 rotates, and the third gear 3 drives the fourth gear 4 to rotate; the fourth gear 4 drives the intermediate shaft Z3 to rotate, thereby realizing the power transmission between the first input shaft Z1 and the intermediate shaft Z3. Here, the second input shaft Z4 drives the intermediate shaft Z3 to rotate as an example for explanation, and the intermediate shaft Z3 drives the second input shaft Z4 to rotate similarly to the above transmission process, which will not be described one by one here.

[0080] The gear ratio between the third gear 3 and the fourth gear 4 is not specifically limited here and may be determined according to actual conditions, all of which are within the protection scope of this application.

[0081] Optional, see Figure 3 The two-speed transmission unit 50 includes: a fifth gear 5 , a sixth gear 6 , a seventh gear 7 and an eighth gear 8 .

[0082] The intermediate shaft Z3 is driven by the output shaft Z2 through the fifth gear 5 , the sixth gear 6 , the seventh gear 7 and the eighth gear 8 .

[0083] That is to say, the second motor 20 transmits power to the intermediate shaft Z3 through the primary reduction device 40, and the intermediate shaft Z3 transmits the power received from the second motor 20 to the output shaft Z2 through the fifth gear, the sixth gear 6, the seventh gear 7 and the eighth gear 8.

[0084] It should be noted that the fifth gear 5 and the sixth gear 6 constitute a first gear transmission; the seventh gear 7 and the eighth gear 8 constitute a second gear transmission; when the shift actuator 60 adopts the first gear, the intermediate shaft Z3 transmits power to the output shaft Z2 through the fifth gear 5 and the sixth gear 6; when the shift actuator 60 adopts the second gear, the intermediate shaft Z3 transmits power to the output shaft Z2 through the seventh gear 7 and the eighth gear 8.

[0085] Optionally, the fifth gear 5 is arranged on the intermediate shaft Z3.

[0086] The sixth gear 6 is disposed on the output shaft Z2.

[0087] The fifth gear 5 meshes with the sixth gear 6 .

[0088] That is to say, the intermediate shaft Z3 transmits power to the output shaft Z2 through the fifth gear 5 and the sixth gear 6 .

[0089] For example, the power of the second motor 20 drives the second input shaft Z4 to transmit, and the third gear 3 arranged on the second input shaft Z4 rotates, and the third gear 3 drives the fourth gear 4 to rotate; the fourth gear 4 drives the intermediate shaft Z3 to rotate, thereby realizing the power transmission between the second input shaft Z4 and the intermediate shaft Z3; the fifth gear 5 arranged on the intermediate shaft Z3 rotates, and the fifth gear 5 drives the sixth gear 6; the sixth gear 6 drives the output shaft Z2 to rotate.

[0090] Optionally, the seventh gear 7 is arranged on the intermediate shaft Z3.

[0091] The eighth gear 8 is disposed on the output shaft Z2.

[0092] The seventh gear 7 meshes with the eighth gear 8 .

[0093] That is to say, the intermediate shaft Z3 transmits power to the output shaft Z2 through the seventh gear 7 and the eighth gear 8 .

[0094] For example, the power of the second motor 20 drives the second input shaft Z4 to transmit, and the third gear 3 arranged on the second input shaft Z4 rotates, and the third gear 3 drives the fourth gear 4 to rotate; the fourth gear 4 drives the intermediate shaft Z3 to rotate, thereby realizing the power transmission between the second input shaft Z4 and the intermediate shaft Z3; the seventh gear 7 arranged on the intermediate shaft Z3 rotates, and the seventh gear 7 drives the eighth gear 8; the eighth gear 8 drives the output shaft Z2 to rotate.

[0095] Optionally, when the shift actuator 60 performs the first shift operation, the shift actuator 60 is combined with the sixth gear 6; at this time, the second motor 20 is in the first gear output.

[0096] The first gear shift operation may be a side gear shift.

[0097] Optionally, when the shift actuator 60 performs the second shift operation, the shift actuator 60 is combined with the eighth gear 8; at this time, the second motor 20 is in the second gear output.

[0098] The second gear shifting operation may be shifting gear to the right.

[0099] The shift actuator 60 performs a shift operation according to the TCU command. When the gear is shifted to the left, it is combined with the sixth gear 6, and the second motor 20 is in the first gear; when the actuator is shifted to the right, it is combined with the eighth gear 8, and the second motor 20 is in the second gear.

[0100] That is to say, the second motor 20 transmits power to the intermediate shaft Z3 through the second input shaft Z4, the third gear 3 and the fourth gear 4, and then transmits power to the output shaft Z2 through the fifth gear 5 and the sixth gear 6 (first gear) or the seventh gear 7 and the eighth gear 8 (second gear) through the shift actuator 60. The torque of the second motor 20 is engaged with the torque of the first motor 10 and then transmitted to the rear axle 30.

[0101] Specifically, the torque transmitted from the fourth gear 4 can be transmitted to the fifth gear 5 or the seventh gear 7 to form a two-speed transmission unit 50, and the gears can be shifted separately according to the needs of the whole vehicle. The fifth gear 5 is meshed with the sixth gear 6 to form the first gear of the two-speed transmission unit 50, and the seventh gear 7 is meshed with the eighth gear 8 to form the second gear of the transmission unit.

[0102] When the gear shift actuator 60 performs the first gear shift operation (first gear), the power of the first motor 10 is transmitted to the second gear 2 through the first input shaft Z1 and the first gear 1; the power of the second motor 20 is transmitted to the sixth gear 6 through the second input shaft Z4, the third gear 3, the fourth gear 4, the intermediate shaft Z3 and the fifth gear 5; the torque of the second gear 2 and the sixth gear 6 is superimposed on the output shaft Z2 and transmitted to the rear axle 30.

[0103] When the shift actuator 60 performs the second shift operation (second gear), the power of the first motor 10 is transmitted to the second gear 2 through the first input shaft Z1 and the first gear 1; the power of the second motor 20 is transmitted to the eighth gear 8 through the second input shaft Z4, the third gear 3, the fourth gear 4, the intermediate shaft Z3 and the seventh gear 7; the torque of the second gear 2 and the eighth gear 8 is superimposed on the output shaft Z2 and transmitted to the rear axle 30.

[0104] The first motor 10 and the second motor 20 form a power transmission path through their respective gear sets and the input shaft, the intermediate shaft Z3 and the output shaft Z2, and ultimately transmit power efficiently to the rear axle 30 to achieve precise control and distribution of torque.

[0105] The shift fork and fork shaft of the shift actuator 60 are both located inside the two-speed gearbox and are part of the two-speed gearbox. The shift motor portion of the shift actuator 60 is exposed outside the two-speed gearbox. The volume of the shift actuator 60 is much smaller than the clutch. Regardless of whether the clutch is hydraulically driven or electrically driven, in addition to adding a clutch pedal to the vehicle, some functional accessories will be added (such as hydraulic transmission requires additional hydraulic pipelines), which affects the complexity of the vehicle.

[0106] In this embodiment, a dual-motor input design is adopted to decompose the vehicle's needs into two motors, significantly reducing the motor size and lowering the assembly cost; the dual-motor dual-input improves the assembly reliability to a certain extent, ensuring that the power system can still function when the vehicle's motor fails partially; the dual-motor two-speed box powertrain configuration eliminates the clutch mechanism, reduces assembly redundancy, and achieves uninterrupted gear shifting while ensuring that the vehicle's needs are met, thereby improving the comfort of the vehicle.

[0107] Another embodiment of the present application provides a power system.

[0108] See also Figure 4 The power system includes: two motors and a two-speed gearbox.

[0109] The first motor 10 is connected to the first input shaft Z1 of the two-speed gearbox.

[0110] The second motor 20 is connected to the second input shaft Z4 of the two-speed gearbox.

[0111] The output shaft Z2 of the two-speed gearbox is connected to the rear axle 30 .

[0112] The specific working process and structure of the two-speed gearbox are detailed in the two-speed gearbox provided in the above embodiment, which will not be described here one by one, and all are within the protection scope of this application.

[0113] Optionally, the first motor 10 and the second motor 20 are motors of the same size; or, the first motor 10 and the second motor 20 are motors of different sizes.

[0114] Specifically, the first motor 10 may be a large motor, and the second motor 20 may be a small motor; of course, they may also be switched, for example, the first motor 10 may be a small motor, and the second motor 20 may be a large motor.

[0115] The main parameter of the motor is the power of the motor. The specific size is usually the same model of motor, the larger the power, the larger the size. Different models of motors are generally larger in size with greater power, but there are some exceptions. For example, because the wound-type motor has a copper rotor head, its size is larger than that of a squirrel-cage motor with slightly greater power. The efficiency of the motor has little to do with the size of the motor.

[0116] That is to say, the large motor can be a motor with a larger power, and the small motor can be a motor with a smaller power. That is to say, motors of different sizes can be motors of the same power, and motors of different sizes can be motors of different power.

[0117] By adopting a configuration of two motors, one large and one small, and combining it with a two-speed gearbox design, the gear position and single-motor or dual-motor input mode can be flexibly switched according to different driving conditions (such as starting, climbing or high-speed cruising) to achieve better power and economy performance and realize dual-motor coordination to optimize performance.

[0118] The first motor 10 and the second motor 20 may both be controlled by an MCU.

[0119] When the vehicle starts or climbs a slope, the first motor 10 outputs and the second motor 20 outputs in the first gear; when the vehicle cruises at high speed, the first motor 10 outputs and the second motor 20 outputs in the second gear.

[0120] It should be noted that the first motor 10 is always in the constant meshing window sill and is always in one gear position, so the first motor 10 may not be divided into the first gear, the second gear, etc.

[0121] MCU can control different motors separately so that each motor can operate within its own high-efficiency range, thereby improving economy. Specifically, the demand for total success rate torque speed under the current working condition of the whole vehicle is decomposed. Based on the different high-efficiency ranges of different gears and different motors, the motor and the two-speed transmission unit 50 are made to fall within the high-efficiency range as much as possible to improve the efficiency of the assembly and thus improve economy. If the whole vehicle requires 400Nm, the first motor 10 is most efficient at 260Nm, and the second motor 20 is most efficient at 140Nm, then the first motor 10 outputs 260Nm and the second motor 20 outputs 140Nm. Other requirements will not be repeated here one by one, depending on the actual situation, and are all within the scope of protection of this application. In other words, according to the different needs of the whole vehicle, the different outputs of the motor are adjusted, and on the premise of meeting the needs of the whole vehicle, the efficient operation of different motors is achieved to improve economy.

[0122] The MCU independently controls the two motors, so that under certain conditions, such as when the second motor 20 shifts gears, the first motor 10 can continue to provide power requirements, ensuring smooth and comfortable driving of the vehicle and improving the driving experience.

[0123] In this embodiment, through the design of a two-speed gearbox and two motors, the vehicle needs under different working conditions and the power is not interrupted when shifting. And only the two-speed gearbox is configured to meet the vehicle needs and the power is not interrupted, reducing the complexity and size of the vehicle.

[0124] The features recorded in the various embodiments in this specification can be replaced or combined with each other, and the same and similar parts between the various embodiments can refer to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiment. The system and system embodiments described above are only schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative work.

[0125] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present utility model.

[0126] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A two-speed gearbox, characterized in that: include: A primary reduction device, a shift actuator, a two-speed transmission unit, an output shaft, an intermediate shaft, two input shafts and a plurality of gears; The two input shafts are respectively connected to the two motors in a one-to-one correspondence; The first input shaft is driven by the output shaft through the first gear and the second gear; The second input shaft is driven by the intermediate shaft through a primary reduction device; The intermediate shaft is transmitted to the output shaft via a two-speed transmission unit; The gear shift actuator is used to switch the gear position of the two-speed transmission unit.

2. The two-speed gearbox according to claim 1, characterized in that: The first gear is disposed on the first input shaft; The second gear is disposed on the output shaft; The first gear and the second gear are meshed.

3. The two-speed gearbox according to claim 1, characterized in that: The primary reduction gear comprises: a third gear and a fourth gear; The third gear is disposed on the second input shaft; The fourth gear is arranged on the intermediate shaft; The third gear is meshed with the fourth gear.

4. The two-speed gearbox according to claim 1, characterized in that: The two-speed gearshift unit comprises: a fifth gear, a sixth gear, a seventh gear and an eighth gear; The intermediate shaft is transmitted to the output shaft via the fifth gear, the sixth gear, the seventh gear and the eighth gear.

5. The two-speed gearbox according to claim 4, characterized in that: The fifth gear is arranged on the intermediate shaft; The sixth gear is arranged on the output shaft; The fifth gear is meshed with the sixth gear.

6. The two-speed gearbox according to claim 4, characterized in that: The seventh gear is arranged on the intermediate shaft; The eighth gear is arranged on the output shaft; The seventh gear is meshed with the eighth gear.

7. The two-speed gearbox according to claim 4, characterized in that: When the shift actuator performs the first shift operation, the shift actuator is combined with the sixth gear.

8. The two-speed gearbox according to claim 4, characterized in that: When the shift actuator performs the second shift operation, the shift actuator is combined with the eighth gear.

9. A power system, characterized in that: include: Two motors and a two-speed gearbox as claimed in any one of claims 1 to 8; The first motor is connected to the first input shaft of the two-speed gearbox; The second motor is connected to the second input shaft of the two-speed gearbox; The output shaft of the two-speed gearbox is connected to the rear axle.

10. The power system according to claim 9, characterized in that: The first motor and the second motor are motors of the same size; or, the first motor and the second motor are motors of different sizes.

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