Coaxial electric drive axle speed reducer transmission device of integrated power takeoff

Abstract

The invention provides a coaxial electric drive axle speed reducer transmission device of an integrated power takeoff, which relates to an electric drive axle and comprises a transmission assembly, a power takeoff assembly and an oil pump, one end of a first gear shaft in the transmission assembly is used for being connected with a motor, a first input gear is fixedly installed on the first gear shaft, a first output gear is rotatably installed on a second gear shaft, a second gear shifting meshing sleeve is further arranged on the second gear shaft, and a second input gear is fixedly installed on the second gear shaft. The second output gear is installed at the input end of the differential mechanism and meshed with the second input gear. A power takeoff input gear in the power takeoff assembly is rotatably installed on a first output shaft, a first gear shifting meshing sleeve is installed on the first output shaft, a power takeoff output gear is fixedly installed on the power takeoff output shaft, and the power takeoff output shaft is connected with an oil pump. The power takeoff has the beneficial effects that the integration degree is higher, the size of the power takeoff is greatly reduced, the height of the dangling edge of the power takeoff is reduced, and the occupied space is saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric drive axle, and in particular to a coaxial electric drive axle reducer transmission device integrated with a power take-off. BACKGROUND

[0002] The main function of the power take-off is to take power from the main engine or driving motor of the vehicle to drive the auxiliary equipment or tools installed on the vehicle. At present, the electric drive axle reducer mechanism of light, medium and heavy new energy (hybrid, pure electric, range extender, fuel cell, etc.) special vehicle mostly adopts an external independent power take-off structure. The external independent power take-off structure is usually an independent power take-off device additionally attached to the output shaft of the electric drive axle or the output shaft of the motor. The external independent power take-off structure has a large structure size and requires a higher layout of the reducer outer dimensions. Especially for special vehicles, the chassis space is more cramped, and the reduction of the size of the entire reducer is more important. Moreover, the current external independent power take-off has a set of shift structure inside to realize the "neutral" effect of the power take-off, and another set of shift execution mechanism inside the reducer. In this regard, the vehicle controller (VCU) needs to coordinate two sets of shift control mechanisms, and the control strategy is complex. In addition, the structure of the external independent power take-off is fixed, that is, the speed ratio is fixed, and when the external power take-off demand changes, the power or torque of the power take-off needs to be adjusted, and the versatility is poor. SUMMARY

[0003] Therefore, in order to solve the above problems of the external independent power take-off structure, the embodiments of the present application provide a coaxial electric drive axle reducer transmission device integrated with a power take-off.

[0004] The embodiments of the present application provide a coaxial electric drive axle reducer transmission device integrated with a power take-off, which comprises a transmission assembly, a power take-off assembly and an oil pump. The transmission assembly comprises a first gear shaft, a first input gear, a first output gear, a second gear shaft, a second input gear, a second output gear and a differential. The first gear shaft and the second gear shaft are arranged in parallel, one end of the first gear shaft is used for connecting a motor, the first input gear is fixedly installed on the first gear shaft, the first output gear is rotatably installed on the second gear shaft and is in mesh with the first input gear, the second gear shaft is further provided with a second shift engagement sleeve, the second shift engagement sleeve is selectively connected with the first output gear, the second input gear is fixedly installed on the second gear shaft, and the second output gear is installed on the input end of the differential and is in mesh with the second input gear. The power take-off assembly comprises a power take-off output shaft, a power take-off input gear, a power take-off input gear and a first gear shift engagement sleeve, the power take-off output shaft is arranged in parallel with the first output shaft, the power take-off input gear is rotatably mounted on the first output shaft, the first gear shift engagement sleeve is mounted on the first output shaft and selectively connected with the power take-off input gear, the power take-off output gear is fixedly mounted on the power take-off output shaft and engaged with the power take-off input gear, and the power take-off output shaft is connected with the oil pump.

[0005] Further, a motor is connected to one end of the first gear shaft.

[0006] Further, the first gear shift engagement sleeve, the power take-off input gear and the first input gear are sequentially arranged on the first gear shaft in a direction away from the motor.

[0007] Further, the second input gear, the first output gear and the second gear shift engagement sleeve are sequentially arranged on the second gear shaft in a direction away from the motor.

[0008] Further, a lower housing and an upper housing are provided, the lower housing is open at the upper end, the upper housing is detachably connected to the upper end of the lower housing, the transmission assembly, the power take-off input gear and the first gear shift engagement sleeve are arranged in the lower housing, the power take-off output shaft and the power take-off output gear are arranged in the upper housing, the oil pump is arranged outside the upper housing, and the motor is arranged outside the lower housing.

[0009] Further, both ends of the first gear shaft, the second gear shaft and the power take-off output shaft are rotatably mounted in the housing through bearings.

[0010] Further, the motor is connected to the first gear shaft through a spline.

[0011] Further, the first output gear is rotatably mounted on the second gear shaft through a bearing, and the power take-off input gear is rotatably mounted on the first gear shaft through a bearing.

[0012] Further, the first gear shift engagement sleeve is mounted on the first gear shaft through a spline, and the second gear shift engagement sleeve is mounted on the second gear shaft through a spline.

[0013] Further, the power take-off output shaft is connected to the oil pump through a spline.

[0014] The technical scheme provided by the embodiment of the application has the beneficial effects that: 1. The coaxial electric drive axle reducer transmission device of the integrated power take-off of the application integrates the power take-off input gear and the first shift engagement sleeve of the power take-off assembly into the transmission assembly, has higher integration, greatly reduces the size of the power take-off, reduces the weight while reducing the height of the power take-off suspension edge, and has higher structural strength and better safety compared with the traditional external power take-off structure; in addition, since most of the structure of the traditional power take-off is combined with the reducer structure, the structure is compact, the weight of the product is reduced by 15% compared with the same level electric drive axle product, the volume is reduced by 20%, and the cost is reduced by 20%. The space occupied by the traditional power take-off is saved, the vehicle chassis is arranged conveniently; the vehicle unsprung mass is reduced, the vehicle ride comfort is better, the kerb mass is reduced, the vehicle passability is better, and the vehicle range is increased.

[0015] 2. The coaxial electric drive axle reducer transmission device of the integrated power take-off of the application is applied to a new energy special vehicle, in a parking state, only the first shift engagement sleeve is used to connect the power take-off input gear and the first output shaft, and the power take-off output shaft transmits torque to the oil pump for power take-off; in a driving process, the first shift engagement sleeve is used to connect the power take-off input gear and the first output shaft, and the second shift engagement sleeve is used to connect the first output gear and the second output shaft, the shift execution mechanism at the power take-off in the traditional scheme and the shift execution mechanism at the reducer are integrated into the shift execution mechanism of the reducer, a "two-in-one" integrated shift is realized, and the control strategy is simple and accurate.

[0016] 3. The coaxial electric drive axle reducer transmission device of the integrated power take-off of the application, the power take-off output shaft is separately arranged in the upper housing, when facing different torque requirements, the power take-off output gear can be replaced to select different speed ratios, an adjustable speed ratio power take-off is used to meet the required torque, and the universality and optimal performance requirement of the product are maximally realized. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a transmission principle diagram of the coaxial electric drive axle reducer transmission device of the integrated power take-off of the application; Figure 2 is a perspective view of the coaxial electric drive axle reducer transmission device of the integrated power take-off of the application; Figure 3 is a front view of the coaxial electric drive axle reducer transmission device of the integrated power take-off of the application; Figure 4 is a torque transmission path diagram of the coaxial electric drive axle reducer transmission device of the integrated power take-off of the application in a parking state power take-off working state; Figure 5 is a torque transmission path diagram of the coaxial electric drive axle reducer transmission device of the integrated power take-off of the application in a vehicle driving power take-off non-working state; Figure 6 is a torque transmission path diagram of a coaxial electric drive axle reducer transmission device of an integrated power take-off vehicle running power take-off of the present application.

[0018] In the figure: 1, motor; 2, first gear shaft; 3, first shift engagement sleeve; 4, power take-off input gear; 5, power take-off output gear; 6, power take-off output shaft; 7, first input gear; 8, first output gear; 9, second shift engagement sleeve; 10, second gear shaft; 11, second input gear; 12, second output gear; 13, differential; 14, oil pump; 15, upper housing; 16, lower housing. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the present application clearer, the following will further describe the embodiments of the present application in combination with the drawings. The following introduces a relatively preferred one of the multiple possible embodiments of the present application, which is intended to provide a basic understanding of the present application, but is not intended to identify the key or decisive elements or limit the scope of protection.

[0020] In all the examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as a limitation. Thus, other examples of example embodiments can have different values.

[0021] Techniques, methods, and equipment known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered part of the specification where appropriate.

[0022] It should be noted that like reference numerals and letters refer to like items in the several views of the drawings, and as such, definitions of those items in one view are not necessarily repeated in subsequent views. It will be further understood that, for the sake of convenience, the drawings are not necessarily drawn to scale.

[0023] In the description of the present application, it should be noted that the circuits and electronic components and modules involved in the present application are all prior art, which can be realized by those skilled in the art without further description, and the content protected by the present application does not involve improvement of internal structure and method.

[0024] It should be further noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0025] Please refer to Figure 1 、 2 and 3, the embodiment of the application provides a coaxial electric drive axle reducer transmission device of integrated power take-off, which is applied to a new energy special vehicle and mainly comprises a transmission assembly, a power take-off assembly and an oil pump 14.

[0026] The transmission assembly comprises a first gear shaft 2, a first input gear 7, a first output gear 8, a second gear shaft 10, a second input gear 11, a second output gear 12 and a differential 13, wherein the first gear shaft 2 and the second gear shaft 10 are arranged in parallel, and here the first gear shaft 2 is located above the second gear shaft 10.

[0027] One end of the first gear shaft 2 is used for connecting a motor 1, the first input gear 7 is fixedly installed on the first gear shaft 2, and the motor 1 drives the first gear shaft 2 to rotate, so that the first input gear 7 can be driven to rotate.

[0028] The first output gear 8 is rotatably installed on the second gear shaft 10 and is in meshing engagement with the first input gear 7. Here, the first output gear 8 is rotatably installed on the second gear shaft 10 through a bearing, so that the first output gear 8 can independently rotate relative to the second gear shaft 10. The second gear shaft 10 is also provided with a second gear shifting engagement sleeve 9, and here the second gear shifting engagement sleeve 9 is installed on the second gear shaft 10 through a spline. The second gear shifting engagement sleeve 9 is selectively connected with the first output gear 8, the second gear shifting engagement sleeve 9 can move axially (to the right) along the second gear shaft 10, is connected with the first output gear 8, so as to fix the first output gear 8 with the second gear shaft 10, so that the rotation of the first output gear 8 can drive the second gear shaft 10 to rotate.

[0029] The second input gear 11 is fixedly installed on the second gear shaft 10, and the second output gear 12 is installed on the input end of the differential 13 and is in meshing engagement with the second input gear 11. The rotation of the second gear shaft 10 drives the second input gear 11 to rotate, the second input gear 11 is in meshing transmission with the second output gear 12, and drives the differential 13 to work.

[0030] The power take-off assembly comprises a power take-off output shaft 6, a power take-off input gear 4, a power take-off input gear 4 and a first shift engagement sleeve 3, the power take-off output shaft 6 is arranged in parallel with the first output shaft, and here the power take-off output shaft 6 is arranged above the first output shaft. The power take-off input gear 4 is rotatably mounted on the first output shaft. Here the power take-off input gear 4 is rotatably mounted on the first gear shaft 2 through a bearing, so that the power take-off input gear 4 can rotate independently relative to the first output shaft. The first shift engagement sleeve 3 is mounted on the first output shaft and selectively connects the power take-off input gear 4, and here the first shift engagement sleeve 3 is mounted on the first gear shaft 2 through a spline. The first shift engagement sleeve 3 can be moved axially (to the left) along the first gear shaft 2, connected with the power take-off input gear 4, so as to fix the power take-off input gear 4 with the first gear shaft 2, so that the rotation of the first gear shaft 2 can drive the power take-off input gear 4 to rotate. The power take-off output gear 5 is fixedly mounted on the power take-off output shaft 6 and is in meshing connection with the power take-off input gear 4, and the power take-off output shaft 6 is connected with the oil pump 14. The power take-off output shaft 6 can be connected with the oil pump 14 through a spline.

[0031] When the first shift engagement sleeve 3 is connected with the power take-off input gear 4, the rotation of the first gear shaft 2 can drive the power take-off input gear 4 to rotate, the power take-off output gear 5 is in meshing transmission with the power take-off input gear 4, drives the power take-off output shaft 6 to rotate, thereby driving the oil pump 14 to work.

[0032] In some embodiments, the coaxial electric drive axle reducer transmission device of the application integrates a power take-off, which is applied to a new energy special vehicle, and further comprises a motor 1 connected to one end of the first gear shaft 2. The motor 1 and the first gear shaft 2 can be connected through a spline.

[0033] The motor 1 drives the first gear shaft 2 to rotate, inputs torque, the two half shafts of the differential 13 are connected with the wheel hub, outputs torque, and drives the wheel hub to rotate.

[0034] In order to make the coaxial electric drive axle reducer transmission device of the application integrate a power take-off, the first shift engagement sleeve 3, the power take-off input gear 4 and the first input gear 7 are arranged in sequence on the first gear shaft 2 in a direction away from the motor 1. The second input gear 11, the first output gear 8 and the second shift engagement sleeve 9 are arranged in sequence on the second gear shaft 10 in a direction away from the motor 1. In this way, the integration degree is higher, and the overall volume is reduced.

[0035] Generally, the coaxial electric drive axle reducer transmission device with an integrated power take-off (PTO) of the present invention also includes a lower housing 16 and an upper housing 15. The lower housing 16 has an open top, and the upper housing 15 is removably connected to the upper end of the lower housing 16. The transmission assembly, the PTO input gear 4, and the first shift engagement sleeve 3 are disposed within the lower housing 16, while the PTO output shaft 6 and PTO output gear 5 are disposed within the upper housing 15. The PTO input gear 4 is disposed at the upper end of the lower housing 16 and meshes with the PTO output gear 5. The oil pump 14 is disposed outside the upper housing 15, and the motor 1 is disposed outside the lower housing 16. Both ends of the first gear shaft 2 and the second gear shaft 10 are rotatably mounted within the lower housing 16 via bearings. Both ends of the PTO output shaft 6 are rotatably mounted within the upper housing 15 via bearings. In this way, when facing different torque requirements, the upper shell 15 can be disassembled and opened, and the power take-off output gear 5 can be replaced to select different speed ratios. An adjustable speed ratio power take-off is used to meet the required torque, thereby maximizing the versatility of the product and achieving the best performance requirements.

[0036] An embodiment of the present invention provides a coaxial electric drive axle reducer transmission device with an integrated power take-off, which is applied to new energy special vehicles and generally has three working states, as follows: 1. Power take-off working in parking state like Figure 4 As shown, the first shift sleeve 3 is controlled to be connected to the power take-off input gear 4, and the second shift sleeve 9 is not connected to the first output gear 8. The motor 1 drives the first gear shaft 2 to rotate. Under the action of the first shift sleeve 3, the first gear shaft 2 drives the power take-off input gear 4 to rotate. The power take-off output gear 5 is meshed with the power take-off input gear 4 for transmission, driving the power take-off output shaft 6 to rotate, thereby driving the oil pump 14 to work and realize power take-off in the parking state.

[0037] 2. The power take-off does not work while the vehicle is driving like Figure 5As shown, the first shift sleeve 3 is disconnected from the power take-off input gear 4, while the second shift sleeve 9 is connected to the first output gear 8. The motor 1 drives the first gear shaft 2 to rotate, driving the first input gear 7. The first output gear 8 and the first input gear 7 mesh with each other. Under the action of the second shift sleeve 9, the first output gear 8 drives the second gear shaft 10 to rotate. The second gear shaft 10 drives the second input gear 11 to rotate. The second output gear 12 and the second input gear 11 mesh with each other, thereby driving the differential 13. The two half-shafts of the differential 13 drive the wheel hubs to rotate, causing the vehicle to move. The power take-off input gear 4 is relatively separated from the first gear shaft 2 and does not rotate, so no power is taken.

[0038] 3. Power take-off operation while the vehicle is moving like Figure 6 As shown, the first shift sleeve 3 is controlled to connect with the power take-off input gear 4, and the second shift sleeve 9 is connected with the first output gear 8. The motor 1 drives the first gear shaft 2 to rotate, driving the first input gear 7. The first output gear 8 and the first input gear 7 mesh with each other. Under the action of the second shift sleeve 9, the first output gear 8 drives the second gear shaft 10 to rotate. The second gear shaft 10 drives the second input gear 11 to rotate. The second output gear 12 and the second input gear 11 mesh with each other, thereby driving the differential 13. The two half-shafts of the differential 13 drive the wheel hubs to rotate, causing the vehicle to move. At the same time, under the action of the first shift sleeve 3, the first gear shaft 2 drives the power take-off input gear 4 to rotate. The power take-off output gear 5 meshes with the power take-off input gear 4, driving the power take-off output shaft 6 to rotate, thereby driving the oil pump 14 to operate, achieving power take-off while the vehicle is moving.

[0039] like Figure 2 and 3 As shown, the present invention's coaxial electric drive axle reducer transmission device with integrated power take-off integrates the power take-off input gear 4 and first shift engagement sleeve 3 of the power take-off assembly into the transmission assembly, achieving a higher level of integration and significantly reducing the size of the power take-off, thereby reducing weight and the height of the power take-off overhang. Furthermore, by combining the majority of the traditional power take-off's structure with the reducer's, the structure is compact, resulting in a 15% reduction in weight, a 20% reduction in volume, and a 20% reduction in cost compared to comparable electric drive axles. This eliminates the space occupied by traditional power take-offs, facilitating vehicle chassis layout; the vehicle's unsprung mass is reduced, resulting in improved vehicle ride comfort, a lower curb weight, improved vehicle passability, and increased vehicle range.

[0040] In this article, the front, back, up, down and other orientation words are defined with the position of the parts in the drawing and the position of the parts relative to each other, just to express the technical scheme clearly and conveniently. It should be understood that they are relative concepts, which can be changed accordingly according to different ways of use and placement, and the use of the orientation words should not limit the scope of the application.

[0041] In the case of no conflict, the above-mentioned embodiments and features in the embodiments can be combined with each other. The above-mentioned is only the preferred embodiment of the application, and is not used to limit the application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application should be included in the protection scope of the application.

Claims

1. A coaxial electric drive axle reducer transmission device with integrated power take-off, characterized in that: Including transmission assembly, power take-off assembly and oil pump; The transmission assembly includes a first gear shaft, a first input gear, a first output gear, a second gear shaft, a second input gear, a second output gear and a differential, wherein the first gear shaft and the second gear shaft are arranged in parallel, one end of the first gear shaft is used to connect to the motor, the first input gear is fixedly mounted on the first gear shaft, the first output gear is rotatably mounted on the second gear shaft and meshes with the first input gear, the second gear shaft is further provided with a second shift engagement sleeve, the second shift engagement sleeve can be selectively connected to the first output gear, the second input gear is fixedly mounted on the second gear shaft, the second output gear is mounted on the input end of the differential and meshes with the second input gear; The power take-off assembly includes a power take-off output shaft, a power take-off input gear, a power take-off input gear and a first shift engagement sleeve. The power take-off output shaft is arranged parallel to the first output shaft. The power take-off input gear is rotatably mounted on the first output shaft. The first shift engagement sleeve is mounted on the first output shaft and can be selectively connected to the power take-off input gear. The power take-off output gear is fixedly mounted on the power take-off output shaft and meshes with the power take-off input gear. The power take-off output shaft is connected to the oil pump.

2. The coaxial electric drive axle reducer transmission device with integrated power take-off according to claim 1, characterized in that: A motor is also included, and the motor is connected to one end of the first gear shaft.

3. The coaxial electric drive axle reducer transmission device with integrated power take-off according to claim 2, characterized in that: The first shift engagement sleeve, the power take-off input gear and the first input gear are sequentially arranged on the first gear shaft in a direction away from the motor.

4. The coaxial electric drive axle reducer transmission device with integrated power take-off according to claim 2, characterized in that: The second input gear, the first output gear and the second shift engagement sleeve are arranged in sequence on the second gear shaft along a direction away from the motor.

5. The coaxial electric drive axle reducer transmission device with integrated power take-off according to claim 2, characterized in that: It also includes a lower shell and an upper shell, the upper end of the lower shell is open, and the upper shell is detachably connected to the upper end of the lower shell. The transmission assembly, the power take-off input gear and the first shift engagement sleeve are arranged inside the lower shell, the power take-off output shaft and the power take-off output gear are arranged in the upper shell, the oil pump is arranged outside the upper shell, and the motor is arranged outside the lower shell.

6. The coaxial electric drive axle reducer transmission device with integrated power take-off according to claim 5, characterized in that: Both ends of the first gear shaft, the second gear shaft and the power take-off output shaft are rotatably mounted in the housing via bearings.

7. The coaxial electric drive axle reducer transmission device with integrated power take-off according to claim 2, characterized in that: The motor and the first gear shaft are connected via a spline.

8. The coaxial electric drive axle reducer transmission device with integrated power take-off according to claim 1, characterized in that: The first output gear is rotatably mounted on the second gear shaft via a bearing, and the power take-off input gear is rotatably mounted on the first gear shaft via a bearing.

9. The coaxial electric drive axle reducer transmission device with integrated power take-off according to claim 1, characterized in that: The first shift engagement sleeve is mounted on the first gear shaft via a spline, and the second shift engagement sleeve is mounted on the second gear shaft via a spline.

10. The coaxial electric drive axle reducer transmission device with integrated power take-off according to claim 1, characterized in that: The power take-off output shaft is connected to the oil pump via a spline.

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