Power uninterrupted gearbox and vehicle

Abstract

The invention discloses a power-uninterrupted gearbox and a vehicle. The power-uninterrupted gearbox comprises a shell, an output shaft, an oil pump and two driving assemblies. One end of the output shaft is positioned in the shell; each driving assembly comprises a driving part, and a front shaft, a middle shaft, a rear shaft, a front gear shifting unit and a rear gear shifting unit which are arranged in the shell, the front gear shifting unit is connected with the front shaft, the middle shaft and the rear shaft and transmits power of the front shaft to the middle shaft, so that the rear shaft is selectively engaged with the front shaft and the middle shaft, and the rear gear shifting unit is connected with the rear shaft and the output shaft and transmits power of the rear shaft to the output shaft. The driving part is in driving connection with the front shafts in the same group and is used for driving the front shafts in the same group to rotate; a rotor of the oil pump is in transmission connection with any middle shaft, and an oil outlet pipe of the oil pump extends into the shell. According to the scheme, power is not interrupted in the gear shifting process, impact caused by gear shifting power interruption is avoided, a good lubricating environment is provided for all parts in the gearbox, the working efficiency and the output efficiency of the gearbox are improved, and practicability is good.

Description

Technical Field

[0001] The present invention relates to the technical field of gearboxes, and in particular to a power uninterrupted type gearbox and a vehicle. Background Art

[0002] With the development of the automobile industry, commercial vehicle pure electric drive technology has ushered in a rapid development opportunity. Patent CN111664230A discloses a drive unit for electric vehicles, which realizes a pure electric drive gearbox with three gears through a drive motor, two planetary gear sets connected in series and a switching element.

[0003] However, this patent may easily cause impact due to power interruption during the gear shifting process, and the drive motor shaft, the first sun gear shaft, the second sun gear shaft and the second planetary carrier are arranged in sequence, which makes manufacturing difficult and costly. In addition, the gear shifting mechanism is arranged so that when shifting from 1st gear to 2nd gear, 3rd gear must be skipped first, and it is difficult to control the motor speed and gear shifting impact during the gear shifting process. Summary of the invention

[0004] The purpose of the present invention is to overcome the above technical deficiencies and to provide a power non-interruption gearbox to solve the technical problem in the prior art that the drive unit has power interruption and causes impact during the gear shifting process.

[0005] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a power uninterrupted gearbox, comprising: case; an output shaft, one end of which is located in the housing; Two sets of drive assemblies, each of which includes a drive unit and a front axle, a middle axle, a rear axle, a front shift unit and a rear shift unit arranged in the housing, the front shift unit connecting the front axle, the middle axle and the rear axle, and transmitting the power of the front axle to the middle axle, and allowing the rear axle to selectively shift gears between the front axle and the middle axle, the rear shift unit connecting the rear axle and the output shaft, the drive unit drivingly connected to the front axle of the same set, for driving the front axle of the same set to rotate; and The oil pump has a rotor which is drivingly connected to any of the central shafts, and an oil outlet pipe which extends into the housing.

[0006] In some embodiments, an end portion of at least one of the two central shafts extends out of the housing; The uninterrupted power transmission also includes a power take-off, which is mounted on one end of the middle shaft extending out of the housing, and the rotor of the oil pump is drivingly connected to the other end of the middle shaft.

[0007] In some embodiments, the front shift unit includes a front gear, a first middle gear, a second middle gear, a first rear gear and a front shift mechanism, the front gear is fixed to the front shaft, the first middle gear and the second middle gear are fixed to the middle shaft, the first rear gear is rotatably sleeved on the rear shaft, and the front shift mechanism is disposed on the rear shaft and located between the front gear and the first rear gear; The front gear is meshed with the first middle gear, the first rear gear is meshed with the second middle gear, and the front shift mechanism can be engaged with and disengaged from the front gear and the first rear gear respectively.

[0008] In some embodiments, the rear shift unit includes a second rear gear, a third rear gear, a rear shift mechanism, a first output gear and a second output gear, the second rear gear and the third rear gear are respectively rotatably sleeved on the rear shaft, the rear shift mechanism is disposed on the rear shaft and is located between the second rear gear and the third rear gear, and the first output gear and the second output gear are disposed at one end of the output shaft located in the housing; The second rear gear is meshed with the first output gear, the third rear gear is meshed with the second output gear, and the rear shift mechanism can be engaged with and disengaged from the second rear gear and the third rear gear respectively.

[0009] In some embodiments, the rear shift unit further comprises a planetary gear and a disengagement mechanism, wherein the wheel shaft of the planetary gear is hollow and rotatably sleeved on the output shaft, and the gear ring of the planetary gear is fixed to the housing, and the disengagement mechanism is arranged on the output shaft, and enables the output shaft to be coupled with and disengaged from the planetary carrier of the planetary gear; The second output gear is fixed to the wheel shaft.

[0010] In some embodiments, the first output gear is connected to the output shaft via internal and external splines, and a tooth side clearance is left; and / or, The second output gear is connected to the wheel shaft via internal and external splines, and a tooth side clearance is left.

[0011] In some embodiments, the numbers of teeth of the front gear, the first middle gear, the second middle gear, the first rear gear, the second rear gear, and the third rear gear of the two groups are all different.

[0012] In some embodiments, the rear shift unit also includes a rear target wheel, a rear speed sensor, an output target wheel and an output speed sensor, the rear target wheel is arranged on the rear axle, the rear speed sensor is arranged on the rear target wheel, the output target wheel is arranged on the output shaft, and the output speed sensor is arranged on the output target wheel.

[0013] In some embodiments, the oil pump is a bidirectional oil pump, and / or the driving unit is a driving motor.

[0014] In a second aspect, the present invention further provides a vehicle, comprising a power uninterrupted transmission as described in any one of the above.

[0015] Compared with the prior art, the power non-interruption type transmission provided by the present invention is provided with two sets of drive assemblies, and the front axles, middle axles and rear axles of the two sets of drive assemblies are connected by a front shift unit, and the gear switching can be realized by means of the front shift unit. At the same time, the rear axle and the output shaft are connected by the rear shift unit, and the gear switching is realized again, thereby improving the flexibility of the gear switching. And because the rear axles of the two sets can transmit power to the output shaft via the rear shift unit, in this way, during the gear shifting process, one of the front shift units of the two sets and one of the rear shift units of the two sets can maintain the current gear and keep the corresponding driving part driving torque, while the driving part, front shift unit and rear shift unit of the other set cooperate to complete the gear shifting process, thereby realizing the power non-interruption during the gear shifting process and avoiding the impact caused by the power interruption of the gear shifting.

[0016] In addition, since the drive unit can continuously drive the middle shaft to rotate through the front shaft and the front shift unit when working, and the rotor of the oil pump is connected to the middle shaft, the gearbox can continuously drive the oil pump to work during operation, and then the oil pump can continuously deliver lubricating oil adapted to the speed to the gearbox, providing a good lubrication environment for various components in the gearbox and improving the working efficiency of the gearbox. And based on the fact that there are two groups of drive assemblies, they can be symmetrically arranged, so that the middle shaft connected to the oil pump rotor can be selected according to actual needs, which is more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the principle of the standard version of the power uninterrupted transmission provided by an embodiment of the present invention; Figure 2 It is a schematic diagram of the principle of a heavy-duty version of a power-uninterrupted gearbox provided by an embodiment of the present invention; Figure 3 yes Figure 2 A partial structural diagram of a medium power uninterrupted transmission; Figure 4 yes Figure 3 A top view of the mid-power uninterrupted transmission; Figure 5 yes Figure 2 A schematic diagram of a set of drive assemblies; Figure 6 yes Figure 2 A schematic diagram of another set of drive assemblies; Figure 7 yes Figure 2Schematic diagram of the output shaft and part of the rear shift unit.

[0018] Description of reference numerals: 1. Output shaft; 11. Auxiliary box output shaft; 2. Drive assembly; 21. Front axle; 22. Middle axle; 23. Rear axle; 24. Front shift unit; 241. Front gear; 242. First middle gear; 243. Second middle gear; 244. First rear gear; 245. Front shift mechanism; 25. Rear shift unit; 251. Second rear gear; 252. Third rear gear; 253. Rear shift mechanism; 254. First output gear; 255. Second output gear; 256. Planetary gear; 257. Disengagement mechanism; 3. Drive unit; 31. Drive motor; 4. Oil pump; 5. Power take-off; 6. Rear target wheel; 7. Rear speed sensor; 8. Output target wheel; 9. Output speed sensor. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] In order to solve the technical problem in the prior art that a driving unit has power interruption and causes impact during a gear shift, the present invention provides a non-power-interrupted gearbox, which can achieve non-power interruption during a gear shift and avoid the impact caused by power interruption during a gear shift. Lubricating oil adapted to the speed can be continuously delivered to the gearbox through an oil pump, thereby providing a good lubrication environment for various components in the gearbox, thereby improving the working efficiency of the gearbox and having good practicality.

[0021] It should be noted that the power uninterruptible transmission described in the present invention is used for but not limited to vehicles, etc. For the convenience of explanation, in the present invention, only the application of the power uninterruptible transmission to vehicles is used as an example for explanation, and the principles of applying the power uninterruptible transmission to other types of equipment are essentially the same as those applied to vehicles, and are not described in detail here.

[0022] See also Figures 1 to 4 , Figures 1 to 4Schematic diagram of a power uninterrupted transmission in an embodiment of the present invention, the power uninterrupted transmission comprises a housing, an output shaft 1, an oil pump 4 and two sets of drive assemblies 2; one end of the output shaft 1 is located in the housing; each drive assembly 2 comprises a driving portion 3 and a front axle 21, a middle axle 22, a rear axle 23, a front shift unit 24 and a rear shift unit 25 arranged in the housing, the front shift unit 24 connects the front axle 21, the middle axle 22 and the rear axle 23, and transmits the power of the front axle 21 to the middle axle 22, and enables the rear axle 23 to selectively engage the front axle 21 and the middle axle 22, the rear shift unit 25 connects the rear axle 23 and the output shaft 1, the driving portion 3 is drivingly connected to the front axle 21 of the same group, and is used to drive the front axle 21 of the same group to rotate; the rotor of the oil pump 4 is drivingly connected to any middle axle 22, and its oil outlet pipe extends into the housing.

[0023] In the power non-interruption type transmission provided by the present invention, two sets of drive assemblies 2 are arranged, and the front axles 21, the middle axles 22 and the rear axles 23 of the two sets of drive assemblies 2 are connected by the front shift unit 24, and the gear switching can be realized by means of the front shift unit 24. At the same time, the rear axle 23 and the output shaft 1 are connected by the rear shift unit 25, and the gear switching is realized again, thereby improving the flexibility of the gear switching. And because the rear axles 23 of the two sets can transmit power to the output shaft 1 via the rear shift unit 25, in this way, during the gear shifting process, one of the two sets of front shift units 24 and one of the two sets of rear shift units 25 can maintain the current gear and keep the corresponding drive unit 3 with the driving torque, while the drive unit 3, the front shift unit 24 and the rear shift unit 25 of the other set cooperate to complete the gear shifting process, thereby realizing the power non-interruption during the gear shifting process and avoiding the impact caused by the power interruption of the gear shifting.

[0024] In addition, since the driving unit 3 can continuously drive the middle shaft 22 to rotate via the front shaft 21 and the front shift unit 24 when working, and the rotor of the oil pump 4 is in transmission connection with the middle shaft 22, the gearbox can continuously drive the oil pump 4 to work during operation, and then the lubricating oil adapted to the speed can be continuously delivered to the gearbox through the oil pump 4, providing a good lubrication environment for various components in the gearbox and improving the working efficiency of the gearbox. In addition, since the driving assembly 2 is provided with two groups, they can be symmetrically arranged, so that the middle shaft 22 to which the rotor of the oil pump 4 is transmission-connected can be selected according to actual needs, which is more practical.

[0025] In one embodiment, at least one end of the two central shafts 22 extends out of the housing; the uninterrupted power transmission also includes a power take-off 5, which is installed at one end of the central shaft 22 extending out of the housing, and the rotor of the oil pump 4 is transmission-connected to the other central shaft 22.

[0026] In this embodiment, the oil pump 4 and the power take-off 5 are arranged on the two groups of middle shafts 22 respectively, and the input speed thereof is proportional to the speed of the driving part 3, and the input speed thereof can be controlled within a certain range by the reduction ratio of the transmission between the front shaft 21 and the middle shaft 22 to meet the working speed requirements of the oil pump 4 and the driver. It should be noted that the setting of the oil pump 4 can provide a suitable flow of lubricating oil to the gearbox, and the power take-off 5 can be turned on to work when the vehicle meets the activation conditions, which improves the output efficiency and flexibility of the gearbox on the one hand, and enables the transmission to work under good lubrication conditions on the other hand.

[0027] In one embodiment, see Figure 2 and Figure 4 The front shift unit 24 includes a front gear 241, a first middle gear 242, a second middle gear 243, a first rear gear 244 and a front shift mechanism 245. The front gear 241 is fixed to the front shaft 21, the first middle gear 242 and the second middle gear 243 are fixed to the middle shaft 22, the first rear gear 244 is rotatably sleeved on the rear shaft 23, and the front shift mechanism 245 is disposed on the rear shaft 23 and is located between the front gear 241 and the first rear gear 244; wherein the front gear 241 is meshed with the first middle gear 242, the first rear gear 244 is meshed with the second middle gear 243, and the front shift mechanism 245 can be engaged with and disengaged from the front gear 241 and the first rear gear 244, respectively.

[0028] In this embodiment, the front gear 241 and the first middle gear 242 are meshed with each other, so that the power of the front axle 21 is continuously transmitted to the middle axle 22, and the rear axle 23 can be engaged with the front axle 21 or the middle axle 22 respectively through the gear switching of the front shift mechanism 245, so that the selection of two gears can be achieved through the front shift mechanism 245. It should be noted that the front shift mechanism 245 is generally composed of a sliding gear sleeve, a plug and play and a corresponding cylinder, and its specific structure and working principle are prior art and will not be elaborated here.

[0029] In addition, in this solution, the driving unit 3 is a driving motor 31, and the rotor of the driving motor 31 is connected to the front shaft 21 through a spline to independently drive the connected front shaft 21. The front and rear ends of the front shaft 21 are supported by bearings, and the bearing at the front end is mounted on the housing. Similarly, the middle shaft 22 and the rear shaft 23 are respectively provided with support bearings to be rotatably mounted on the housing.

[0030] In one embodiment, the rear shift unit 25 includes a second rear gear 251, a third rear gear 252, a rear shift mechanism 253, a first output gear 254 and a second output gear 255. The second rear gear 251 and the third rear gear 252 are respectively rotatably sleeved on the rear shaft 23. The rear shift mechanism 253 is disposed on the rear shaft 23 and is located between the second rear gear 251 and the third rear gear 252. The first output gear 254 and the second output gear 255 are disposed at one end of the output shaft 1 located in the housing; wherein the second rear gear 251 is meshed with the first output gear 254, the third rear gear 252 is meshed with the second output gear 255, and the rear shift mechanism 253 can be engaged with and disengaged from the second rear gear 251 and the third rear gear 252, respectively.

[0031] In this embodiment, by switching the rear shift mechanism 253, the second rear gear 251 and the first output gear 254 can be meshed and transmitted, and the third rear gear 252 and the second output gear 255 can be meshed and transmitted, respectively, to achieve the switching of the two gears. It should be noted that the specific structure and principle of the rear shift mechanism 253 are similar to the specific structure and principle of the front shift mechanism 245, and are not described in detail here. In addition, the second rear gear 251 and the third rear gear 252 are respectively provided with bearings between the rear axle 23.

[0032] In one embodiment, the rear shift unit 25 further includes a planetary gear 256 and a disengagement mechanism 257. The axle of the planetary gear 256 is hollow and rotatably sleeved on the output shaft 1. The ring gear of the planetary gear 256 is fixed to the housing. The disengagement mechanism 257 is disposed on the output shaft 1 and enables the output shaft 1 to be coupled to and disengaged from the planetary carrier of the planetary gear 256. The second output gear 255 is fixed to the axle.

[0033] In this embodiment, the disengagement mechanism 257 enables the planetary carrier of the planetary gear 256 to be coupled and disengaged from the output shaft 1, so as to be disconnected under certain circumstances to avoid overspeeding of the third rear gear 252 and its corresponding needle bearing. It should be noted that the specific structure and principle of the disengagement mechanism 257 refer to the shifting mechanism. In addition, when the output shaft 1 is not provided with the planetary gear 256 and the disengagement mechanism 257, the gearbox is a standard-load version; and when the output shaft 1 is provided with the planetary gear 256 and the disengagement mechanism 257, the gearbox is a heavy-load version.

[0034] And one or more of the front gear 241 / first middle gear 242, the first rear gear 244 / second middle gear 243, the second rear gear 251 / first output gear 254, and the third rear gear 252 / second output gear 255 can adjust the speed ratio as needed to adapt to the scene application needs.

[0035] In one embodiment, the first output gear 254 is connected to the output shaft 1 through internal and external splines, and a tooth side clearance is left; the second output gear 255 is connected to the axle through internal and external splines, and a tooth side clearance is left.

[0036] In this embodiment, the first output gear 254 is connected to the output shaft 1 through internal and external splines, and the splines are provided with a small tooth side clearance to avoid the problem of unbalanced load on the output shaft 1 due to incompletely consistent torque when the two drive motors 31 work at the same time. The second output gear 255 is also connected to the axle of the planetary gear 256 through internal and external splines, and the same technology is used to solve the unbalanced load problem.

[0037] It should be noted that when the gears on the two power transmission paths: the front gear 241, the first middle gear 242, the second middle gear 243, the first rear gear 244, the second rear gear 251 and the third rear gear 252 have the same number of teeth, that is, when the two symmetrical gears on the two lines have the same number of teeth, the gearbox has four gear positions and seven states as described in Table 1 below.

[0038] When the numbers of teeth of the two groups of front gear 241, first middle gear 242, second middle gear 243, first rear gear 244, second rear gear 251 and third rear gear 252 are all different, that is, when the numbers of teeth of the two symmetrical gears on the two lines are different, the gearbox has 8 gear positions and 15 states as described in Table 2 below.

[0039] For ease of description, see Figures 5 to 7 The two front shift mechanisms 245 are defined as SH1 and SH1', the two rear shift mechanisms 253 are defined as SH2 and SH2', and the disengagement mechanism 257 is defined as SH3. In addition, the two drive motors 31 are defined as M1 and M2.

[0040] In this way, two gearboxes are derived while making the parts as universal as possible; the heavy-duty version is used for application scenarios with a peak output torque of approximately 30,000 Nm, and the standard-duty version is used for application scenarios with a peak output torque of approximately 20,000 Nm.

[0041] Table 1 Heavy-duty version power transmission combination 1

[0042] Table 2 Heavy-duty version power transmission combination 2 Note: Indicates meshing.

[0043] In one embodiment, the rear shift unit 25 also includes a rear target wheel 6, a rear speed sensor 7, an output target wheel 8 and an output speed sensor 9, the rear target wheel 6 is arranged on the rear axle 23, the rear speed sensor 7 is arranged on the rear target wheel 6, the output target wheel 8 is arranged on the output shaft 1, and the output speed sensor 9 is arranged on the output target wheel 8.

[0044] In this embodiment, the rear target wheel 6 and the rear speed sensor 7 are connected to the rear axle 23, and the speed of the rear axle 23 can be monitored in real time in both directions; the output target wheel 8 and the output speed sensor 9 are connected to the output shaft 1, and the speed of the output shaft 1 can be monitored in real time in both directions.

[0045] In one embodiment, the oil pump 4 is a bidirectional oil pump 4 .

[0046] In this embodiment, the oil pump 4 is configured as a bidirectional oil pump and connected to the middle shaft 22, so that a suitable lubricating oil flow rate can be provided to the gearbox when the drive motor 31 rotates forward or reversely. It should be noted that the power uninterrupted gearbox also includes an auxiliary box output shaft 11, one end of which is supported on the housing through a bearing and is connected to the output shaft 1 through a spline.

[0047] In addition, the present invention further provides a vehicle, the vehicle comprising the power uninterruptible transmission as described in any one of the above. It should be noted that the detailed structure of the power uninterruptible transmission of the vehicle can refer to the embodiment of the power uninterruptible transmission, which will not be described in detail here; since the power uninterruptible transmission is used in the vehicle of the present invention, the embodiment of the vehicle of the present invention includes all technical solutions of all embodiments of the power uninterruptible transmission, and the technical effects achieved are also exactly the same, which will not be described in detail here.

[0048] In order to better understand the present invention, the following Figures 1 to 7 The technical solution of the present invention is described in detail: The front shift mechanism SH1 and SH1' are in the "B" position, the rear shift mechanism SH2 and SH2' are in the "D" position, and the disengagement mechanism SH3 is in the "E" position. The power of the driving motor M1 is transmitted to the front shaft 21, and then transmitted to the auxiliary box output shaft 11 through the front gear 241 / the first middle gear 242, the second middle gear 243 / the first rear gear 244, the third rear gear 252 / the second output gear 255, the planetary gear 256, and the output shaft 1. At this time, it is the first gear; Similarly, the front shift mechanism SH1 and SH1' are in the "B" position, the rear shift mechanism SH2 and SH2' are in the "D" position, and the disengagement mechanism 257SH3 is in the "E" position. The power of the drive motor M1 is transmitted to the front shaft 21, and is transmitted to the auxiliary box output shaft 11 through the gear set front gear 241 / first middle gear 242, the second middle gear 243 / first rear gear 244, the second rear gear 251 / first output gear 254, the planetary gear 256, and the output shaft 1. At this time, it is the second gear; Similarly, the front shift mechanism SH1 and SH1' are in the "A" position, the rear shift mechanism SH2 and SH2' are in the "D" position, and the disengagement mechanism SH3 is in the "E" position. The power of the drive motor M1 is transmitted to the front axle 21, and then transmitted to the auxiliary box output shaft 11 through the rear axle 23, the third rear gear 252 / the second output gear 255 of the gear set, the planetary gear 256, and the output shaft 1. At this time, it is the third gear; Similarly, when the front shift mechanisms SH1 and SH1' are in the "A" position, and the rear shift mechanisms SH2 and SH2' are in the "C" position, the power of the drive motor M1 is transmitted to the front axle 21, and then transmitted to the auxiliary box output shaft 11 through the rear axle 23, the second rear gear 251 / the first output gear 254, and the output shaft 1. At this time, it is the fourth gear; during this period, when the output speed sensor 9 monitors that the speed is greater than a certain value (which can be calibrated), the disengagement mechanism SH3 is in the "N" position to prevent the output shaft 1 from dragging the planetary gear 256 back and causing the third rear gear 252 to overspeed and damage its corresponding bearing.

[0049] Another power transmission route: the driving motor M2 transmits power to the other front axle 21, which also has four gears.

[0050] The above two power systems can work independently or simultaneously. During the gear shifting process, one of the gear shifting mechanisms SH1 or SH1', SH2 or SH2' maintains the current gear position, and the corresponding drive motor M1 or M2 maintains the driving torque, while the other drive motor 31 cooperates with the corresponding gear shifting mechanism to complete the gear shifting process, thus achieving uninterrupted power during the gear shifting process.

[0051] When the gears on the above two power transmission paths: the front gear 241, the first middle gear 242, the second middle gear 243, the first rear gear 244, the second rear gear 251 and the third rear gear 252 have the same number of teeth, this gearbox has 4 gears and 7 states as shown in Table 1 above; when the number of teeth is different, this gearbox has 8 gears and 15 states as shown in Table 2 above.

[0052] The bidirectional oil pump 4 and the power take-off 5 are arranged on one of the middle shafts 22 respectively; their input speed is proportional to the motor speed, and the input speed can be controlled within a certain range through the reduction ratio of the gear set (front gear 241 / first middle gear 242) to meet the working speed requirements of the oil pump 4 and the power take-off 5. Since the bidirectional oil pump 4 needs to work all the time when the gearbox is running, the fatigue life of the shaft teeth is designed and the working time allocation strategy of the two motors under the single motor condition is used to keep the life of the two power system parts equal.

[0053] Thus, this solution has the following advantages: 1. The driving motors M1 and M2 can drive two power systems independently, and the front shift mechanisms SH1 and SH1', and the rear shift mechanisms SH2 and SH2' can drive the sliding gear sleeve independently; 2. During the gear shifting process, one of the front gear shifting mechanism SH1 or SH1' and the rear gear shifting mechanism SH2 or SH2' maintains the current gear position, and the corresponding drive motor M1 or M2 maintains the driving torque. The other drive motor 31 cooperates with the corresponding gear shifting mechanism to complete the gear shifting process, thereby achieving uninterrupted power during the gear shifting process.

[0054] 3. The planetary gearbox 256 and the disengagement mechanism 257 can be selected and matched to derive two types of gearboxes while keeping the parts as universal as possible, respectively coping with heavy-load and standard-load application scenarios; 4. The bidirectional oil pump 4 and the power take-off 5 are arranged on one of the intermediate shafts respectively; the bidirectional oil pump 4 can output a suitable lubricating oil flow rate in any working state of the motor (forward and reverse rotation, high and low speed); 5. The first output gear 254 and the output shaft 1, and the second output gear 255 and the wheel shaft are connected by internal and external splines with a small tooth side clearance to solve the problem of eccentric load; 6. The setting of the disengagement mechanism SH3 enables the planet carrier of the planetary gear 256 to be combined with the output shaft 1, and can be disconnected under specific working conditions to avoid overspeed of the third output gear of the third gear and the corresponding needle bearing.

[0055] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A power uninterrupted gearbox, It is characterized in that include: case; an output shaft, one end of which is located in the housing; Two sets of drive assemblies, each of which includes a drive unit and a front axle, a middle axle, a rear axle, a front shift unit and a rear shift unit arranged in the housing, the front shift unit connecting the front axle, the middle axle and the rear axle, and transmitting the power of the front axle to the middle axle, and enabling the rear axle to selectively shift gears between the front axle and the middle axle, the rear shift unit connecting the rear axle and the output shaft, the drive unit drivingly connected to the front axle of the same set, for driving the front axle of the same set to rotate; and The oil pump has a rotor which is drivingly connected to any of the central shafts, and an oil outlet pipe which extends into the housing.

2. The power uninterrupted gearbox according to claim 1, It is characterized in that An end portion of at least one of the two central shafts extends out of the housing; The uninterrupted power transmission also includes a power take-off, which is mounted on one end of the middle shaft extending out of the housing, and the rotor of the oil pump is drivingly connected to the other end of the middle shaft.

3. The power uninterrupted transmission according to claim 1, It is characterized in that The front shift unit comprises a front gear, a first middle gear, a second middle gear, a first rear gear and a front shift mechanism, wherein the front gear is fixed to the front shaft, the first middle gear and the second middle gear are fixed to the middle shaft, the first rear gear is rotatably sleeved on the rear shaft, and the front shift mechanism is disposed on the rear shaft and located between the front gear and the first rear gear; The front gear is meshed with the first middle gear, the first rear gear is meshed with the second middle gear, and the front shift mechanism can be engaged with and disengaged from the front gear and the first rear gear respectively.

4. The power uninterrupted gearbox according to claim 3, It is characterized in that The rear shift unit comprises a second rear gear, a third rear gear, a rear shift mechanism, a first output gear and a second output gear, the second rear gear and the third rear gear are respectively rotatably sleeved on the rear shaft, the rear shift mechanism is arranged on the rear shaft and is located between the second rear gear and the third rear gear, and the first output gear and the second output gear are arranged at one end of the output shaft located in the housing; The second rear gear is meshed with the first output gear, the third rear gear is meshed with the second output gear, and the rear shift mechanism can be engaged with and disengaged from the second rear gear and the third rear gear respectively.

5. The power uninterrupted transmission according to claim 4, It is characterized in that The rear shift unit further comprises a planetary gear and a disengagement mechanism, wherein the wheel shaft of the planetary gear is hollow and rotatably sleeved on the output shaft, and the gear ring of the planetary gear is fixed to the housing, and the disengagement mechanism is arranged on the output shaft, and enables the output shaft to be coupled with and disengaged from the planetary carrier of the planetary gear; The second output gear is fixed to the wheel shaft.

6. The power uninterrupted transmission according to claim 5, It is characterized in that The first output gear is connected to the output shaft via internal and external splines, and a tooth side clearance is left; and / or, The second output gear is connected to the wheel shaft via internal and external splines, and a tooth side clearance is left.

7. The power uninterrupted transmission according to claim 4, It is characterized in that The numbers of teeth of the front gear, the first middle gear, the second middle gear, the first rear gear, the second rear gear and the third rear gear of the two groups are all different.

8. The power uninterrupted transmission according to claim 4, It is characterized in that The rear shift unit also includes a rear target wheel, a rear speed sensor, an output target wheel and an output speed sensor, wherein the rear target wheel is arranged on the rear axle, the rear speed sensor is arranged on the rear target wheel, the output target wheel is arranged on the output shaft, and the output speed sensor is arranged on the output target wheel.

9. The power uninterrupted transmission according to claim 1, It is characterized in that The oil pump is a bidirectional oil pump, and / or the driving unit is a driving motor.

10. A vehicle, It is characterized in that Comprising a power uninterrupted transmission as claimed in any one of claims 1 to 9.

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