Four-motor two-gear electric drive gearbox and engineering machinery
Through the four-motor two-speed electric drive transmission structure, the number of meshing times and power output path are increased, the problem of power interruption in mining vehicles is solved, and efficient power transmission and safety improvement is achieved.
Patent Information
- Application Number
- CN202510758457.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-06
- Publication Date
- 2025-07-25
AI Technical Summary
The existing electric drive transmissions have power interruptions in mining vehicles, especially during heavy-load climbing, which cannot meet the speed range and torque requirements for efficient operation of high-speed motors, resulting in safety hazards.
The four-motor two-speed electric drive transmission structure is adopted. The four-motor parallel drive is driven, and the transition gear hub body is increased to increase the number of meshing times, achieving the continuity of power output, and the mode switching of the gear shifting device is performed on one intermediate shaft, while the other intermediate shaft maintains power output to avoid power interruption.
It improves the transmission speed ratio, adapts to high-speed motors, optimizes the space structure, reduces production costs, and achieves uninterrupted power during gear shifting, improving the power performance and safety of mining vehicles.
Smart Images
Figure CN120368018A_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the technical field of new energy transmissions, and relates to a four-motor two-speed electric drive transmission and engineering machinery, and specifically to a four-motor two-speed electric drive transmission and engineering machinery for mining. Background Art
[0002] At present, high-speed motors are increasingly used in the field of new energy mining vehicles due to their advantages of small size, light weight, low cost and high power density. This has put forward new requirements for the matching gearbox. On the one hand, high-speed motors have a wider speed range for efficient operation, and the motor can operate in the high-efficiency area without the need for the transmission to provide too many gear adjustments. Generally, 2 gears are sufficient to meet the needs of heavy-load operation and high-speed driving of the vehicle. On the other hand, due to the high speed and low torque of high-speed motors under the same power conditions, the electric drive transmission is required to have a large speed ratio to provide sufficient torque to drive the vehicle, ensuring that the mining vehicle has good power performance and climbing ability under heavy-load conditions.
[0003] In addition, in actual mining operations, new energy mining vehicles often need to climb slopes and cross complex terrain while fully loaded. Due to the limitations of structure and design principles, many traditional electric drive transmissions will have power interruption problems during the gear shifting process, which may cause the vehicle to slip when climbing a slope with a heavy load, posing a safety hazard. Summary of the invention
[0004] Purpose: In view of at least one of the above technical problems, the present application provides a four-motor, two-speed electric drive gearbox and engineering machinery to address the problems that high-speed motors for mining vehicles have a wide range of efficient operating speeds, require fewer gears for matching gearboxes, and that high-speed motors have high speeds and low torque, which may lead to insufficient power for the entire vehicle.
[0005] Technical solution: To solve the above technical problems, the technical solution adopted in this application is: In a first aspect, a four-motor two-speed electric drive transmission is provided, comprising: the power of the first motor is output to the first input shaft, the power of the second motor is output to the second input shaft, the power of the third motor is output to the third input shaft, and the power of the fourth motor is output to the fourth input shaft; the first input shaft and the second input shaft are transmission-connected to the first intermediate shaft via the first input gear pair and the second input gear pair, and the third input shaft and the fourth input shaft are transmission-connected to the second intermediate shaft via the third input gear pair and the fourth input gear pair; the first intermediate shaft and the second intermediate shaft are transmission-connected to the output shaft via the first intermediate gear pair and the second intermediate gear pair respectively, the first gear hub body and the second gear hub body are floatingly mounted on the output shaft, the first input gear pair is transmission-connected to the second input gear pair via the first gear hub body, and the third input gear pair is transmission-connected to the fourth input gear pair via the second gear hub body; The first shifting device is located on the first intermediate shaft and selectively engages or disengages with the driving gear on the first side of the first intermediate gear pair or the driving gear on the first side of the second intermediate gear pair. The second shifting device is located on the second intermediate shaft and selectively engages or disengages with the driving gear on the second side of the first intermediate gear pair or the driving gear on the second side of the second intermediate gear pair to form gear position N, gear position 1, and gear position 2.
[0006] In some embodiments, the first input gear pair includes a first driving gear mounted on the first input shaft, a second driving gear mounted on the second input shaft, and a first driven gear mounted on the first gear hub. The first driving gear and the second driving gear respectively mesh with the first driven gear. The second input gear pair includes a third driving gear mounted on the first gear hub and a second driven gear mounted on the first intermediate shaft. The third driving gear meshes with the second driven gear. The first driven gear and the third driving gear are mounted on the first gear hub. The third input gear pair includes a fourth driving gear mounted on the third input shaft, a fifth driving gear mounted on the fourth input shaft, and a third driven gear mounted on the second gear hub. The fourth driving gear and the fifth driving gear respectively mesh with the third driven gear. The fourth input gear pair includes a sixth driving gear mounted on the second gear hub and a fourth driven gear mounted on the second intermediate shaft. The sixth driving gear meshes with the fourth driven gear. The third driven gear and the sixth driving gear are mounted on the second gear hub. The first intermediate gear pair includes a seventh driving gear floatingly arranged on the first intermediate shaft, an eighth driving gear floatingly arranged on the second intermediate shaft, and a fifth driven gear mounted on the output shaft. The seventh driving gear and the eighth driving gear respectively mesh with the fifth driven gear. The second intermediate gear pair includes a ninth driving gear floatingly arranged on the first intermediate shaft, a tenth driving gear floatingly arranged on the second intermediate shaft, and a sixth driven gear mounted on the output shaft. The ninth driving gear and the tenth driving gear respectively mesh with the sixth driven gear.
[0007] In some embodiments, the first shifting device is located between the first intermediate gear pair and the second intermediate gear pair and selectively engages or disengages with the seventh driving gear or the ninth driving gear. The second shifting device is located between the first intermediate gear pair and the second intermediate gear pair and selectively engages or disengages with the eighth driving gear or the tenth driving gear.
[0008] In some embodiments, the first shifting device and the second shifting device can shift independently of each other and both have positions L, N, and R.
[0009] When both the first shifting device and the second shifting device are in the N position, gear position N is achieved.
[0010] When the first shifting device is in the R position and the second shifting device is in the R position, the first shifting device engages with the ninth driving gear of the second intermediate gear pair, and the second shifting device engages with the tenth driving gear of the second intermediate gear pair; the power of the first motor and the second motor is transmitted to the first intermediate shaft through the first input gear pair and the second input gear pair, and then transmitted to the output shaft through the second intermediate gear pair. The power of the third motor and the fourth motor is transmitted to the second intermediate shaft through the third input gear pair and the fourth input gear pair, and then transmitted to the output shaft through the second intermediate gear pair. After the two powers are confluent, they are jointly output from the output shaft to achieve gear position 1.
[0011] When the first shifting device is in the L position and the second shifting device is in the L position, the first shifting device engages with the seventh driving gear of the first intermediate gear pair, and the second shifting device engages with the eighth driving gear of the first intermediate gear pair; the power of the first motor and the second motor is transmitted to the first intermediate shaft through the first input gear pair and the second input gear pair, and then transmitted to the output shaft through the first intermediate gear pair. The power of the third motor and the fourth motor is transmitted to the second intermediate shaft through the third input gear pair and the fourth input gear pair, and then transmitted to the output shaft through the first intermediate gear pair. After the two powers are confluent, they are jointly output from the output shaft to achieve gear position 2.
[0012] When switching from gear position N to gear position 1, the first shifting device performs the switching operation of the working mode from the N position to the R position, and the second shifting device simultaneously performs the switching operation of the working mode from the N position to the R position. Thus, the gear shift from gear position N to gear position 1 is completed. Start the first motor, the second motor, the third motor and the fourth motor. The power of the first motor and the second motor is transmitted to the output shaft through the second intermediate gear pair after passing through the first intermediate shaft. The power of the third motor and the fourth motor is transmitted to the output shaft through the second intermediate gear pair after passing through the second intermediate shaft. After the two powers are confluent, they are jointly output from the output shaft.
[0013] When switching from gear position 1 to gear position N, the first motor, the second motor, the third motor and the fourth motor are all disengaged from the power. The first shifting device performs the switching operation of the working mode from the R position to the N position, and the second shifting device simultaneously performs the switching operation of the working mode from the R position to the N position. Thus, the gear shift from gear position 1 to gear position N is completed.
[0014] When shifting from gear 1 to gear 2, the first motor and the second motor first disengage from the power. The first shifting device performs the operation of switching the working mode from the R position to the L position. At this time, the power of the third motor and the fourth motor passes through the second intermediate shaft and then is transmitted to the output shaft through the second intermediate gear pair. After the switching is completed, the first motor and the second motor provide power, which passes through the first intermediate shaft and then is transmitted to the output shaft through the first intermediate gear pair. Then, the third motor and the fourth motor first disengage from the power. The second shifting device performs the operation of switching the working mode from the R position to the L position. After the operation is completed, the third motor and the fourth motor resume power again, pass through the second intermediate shaft and then are transmitted to the output shaft through the first intermediate gear pair, and are jointly output after converging with the power transmitted from the first motor and the second motor to the output shaft through the first intermediate shaft and the first intermediate gear pair. Thus, the gear shift from gear 1 to gear 2 is completed.
[0015] When shifting from gear 2 to gear 1, the first motor and the second motor first disengage from the power. The first shifting device performs the operation of switching the working mode from the R position to the L position. At this time, the power of the third motor and the fourth motor passes through the second intermediate shaft and then is transmitted to the output shaft through the second intermediate gear pair. After the switching is completed, the first motor and the second motor provide power, which passes through the first intermediate shaft and then is transmitted to the output shaft through the first intermediate gear pair. Then, the third motor and the fourth motor first disengage from the power. The second shifting device performs the operation of switching the working mode from the R position to the L position. After the operation is completed, the third motor and the fourth motor resume power again, pass through the second intermediate shaft and then are transmitted to the output shaft through the first intermediate gear pair, and are jointly output after converging with the power transmitted from the first motor and the second motor to the output shaft through the first intermediate shaft and the first intermediate gear pair. Thus, the gear shift from gear 1 to gear 2 is completed.
[0016] In a second aspect, a construction machinery is provided, including the four-motor two-speed electric drive gearbox described above.
[0017] In some embodiments, the construction machinery is a new energy mining vehicle.
[0018] Beneficial effects: The four-motor two-speed electric drive gearbox and construction machinery provided by this application have the following advantages: It includes 4 input motors, four motor connecting shafts, two intermediate shafts, one output shaft, two gear hubs, six gear pairs, and 2 shifting devices, forming two speed gears. A transition gear hub with two fixed gears is added between the motor shaft and the intermediate shaft, enabling the power of the motor to be output through two-stage meshing transmission to the intermediate shaft, and then the power is transmitted to the output shaft through the left and right selection of gear pairs by the intermediate shaft shifting device to achieve power output. This transition structure increases the number of meshing times, improves the transmission ratio, and is suitable for the application of high-speed motors. At the same time, the gear hub is floatingly arranged on the output shaft, which also saves the number of shafts, optimizes the spatial structure, and reduces production costs. In addition, the gearbox is driven by four motors in parallel. When performing a shifting operation, the shifting device on one intermediate shaft switches the mode, and the other intermediate shaft shifting device remains unchanged to achieve continuous output of the output power, realizing uninterrupted shifting power. Description of the Drawings
[0019] Figure 1 It is a schematic diagram of the principle of the four-motor two-speed electric drive gearbox according to an embodiment of the present application; In the figure: First motor EM1, second motor EM2, third motor EM3, fourth motor EM4; First input shaft S1, second input shaft S2, third input shaft S3, fourth input shaft S4, first intermediate shaft S5, second intermediate shaft S6, output shaft S7; First gear hub H1, second gear hub H2; First driving gear Z1, second driving gear Z2, first driven gear Z3, third driving gear Z4, second driven gear Z5, fourth driving gear Z6, fifth driving gear Z7, third driven gear Z8, sixth driving gear Z9, fourth driven gear Z10, seventh driving gear Z11, eighth driving gear Z12, fifth driven gear Z13, ninth driving gear Z14, tenth driving gear Z15, sixth driven gear Z16; First shifting device A, second shifting device B. Detailed Embodiments
[0020] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way constitutes a limitation to the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.
[0021] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the description. In all the examples shown and discussed here, any specific values should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, further discussion thereof in subsequent drawings is not required.
[0022] In the description of the present application, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, the meaning of "a plurality" is two or more.
[0023] In the description of the present application, it should be noted that, unless otherwise clearly specified and defined, the terms "mounted", "connected", and "coupled" should be construed broadly. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood through specific circumstances.
[0024] In view of the problems that the high-speed motor of the mining vehicle has a wide efficient operating speed range and the demand for matching gearbox gears decreases, the present application provides a gearbox with two gears; in view of the problem that the high-speed motor has a high speed and a small torque, which may lead to insufficient power of the whole vehicle, a four-motor drive scheme is provided. At the same time, a transition gear hub body with two fixed gears is added between the motor input shaft and the intermediate shaft, so that the number of power output engagements in each gear reaches 3 times, which is one more than the traditional two engagements, realizing the expansion of the speed ratio; in view of the requirement of uninterrupted power of the mining vehicle, a power transmission path with two intermediate shafts independently outputting power is selected. When performing a gear shift operation, the shift device on one intermediate shaft switches the mode, and the shift device on the other intermediate shaft remains unchanged to achieve continuous output of the output power, realizing uninterrupted shift power.
[0025] Embodiment 1: As Figure 1 shown, a four-motor two-speed electric drive gearbox includes: a first motor EM1, a second motor EM2, a third motor EM3, a fourth motor EM4, a first input shaft S1, a second input shaft S2, a third input shaft S3, a fourth input shaft S4, a first intermediate shaft S5, a second intermediate shaft S6, an output shaft S7, a first gear hub H1, a second gear hub H2, a first input gear pair, a second input gear pair, a third input gear pair, a fourth input gear, a first intermediate gear pair, a second intermediate gear pair, a first shift device A, and a second shift device B; The power of the first motor EM1 is output to the first input shaft S1, the power of the second motor EM2 is output to the second input shaft S2, the power of the third motor EM3 is output to the third input shaft S3, and the power of the fourth motor EM4 is output to the fourth input shaft S4; the first input shaft S1 and the second input shaft S2 are connected to the first intermediate shaft S5 through the first input gear pair and the second input gear pair, and the third input shaft S3 and the fourth input shaft S4 are connected to the second intermediate shaft S6 through the third input gear pair and the fourth input gear pair; the first intermediate shaft S5 and the second intermediate shaft S6 are respectively connected to the output shaft S7 through the first intermediate gear pair and the second intermediate gear pair. The first gear hub H1 and the second gear hub H2 are floatingly installed on the output shaft S7. The first input gear pair and the second input gear pair are connected through the first gear hub H1, and the third input gear pair and the fourth input gear pair are connected through the second gear hub H2; The first shift device A is located on the first intermediate shaft S5 and selectively engages or disengages with the driving gears (the seventh driving gear Z11 and the ninth driving gear Z14) on the first side of the first intermediate gear pair and the second intermediate gear pair. The second shift device B is located on the second intermediate shaft S6 and selectively engages or disengages with the driving gears (the eighth driving gear Z12 and the tenth driving gear Z15) on the second side of the first intermediate gear pair and the second intermediate gear pair to form a neutral gear N, a first gear 1, and a second gear 2.
[0026] In some embodiments, as Figure 1 shown, the first input gear pair includes a first driving gear Z1 fixed on a first input shaft S1, a second driving gear Z2 fixed on a second input shaft S2, and a first driven gear Z3 fixed on a first gear hub H1. The driving gear Z1 and the second driving gear Z2 are respectively engaged with the first driven gear Z3; The second input gear pair includes a third driving gear Z4 fixed on the first gear hub H1 and a second driven gear Z5 fixed on a first intermediate shaft S5. The third driving gear Z4 is engaged with the second driven gear Z5; the first driven gear Z3 and the third driving gear Z4 are fixedly installed on the first gear hub H1; The third input gear pair includes a fourth driving gear Z6 fixed on a third input shaft S3, a fifth driving gear Z7 fixed on a fourth input shaft S4, and a third driven gear Z8 fixed on a second gear hub H2. The fourth driving gear Z6 and the fifth driving gear Z7 are respectively engaged with the third driven gear Z8; The fourth input gear pair includes a sixth driving gear Z9 fixed on the second gear hub H2 and a fourth driven gear Z10 fixed on a second intermediate shaft S6. The sixth driving gear Z9 is engaged with the fourth driven gear Z10; the third driven gear Z8 and the sixth driving gear Z9 are fixedly installed on the second gear hub H2; The first intermediate gear pair includes a seventh driving gear Z11 floatingly arranged on the first intermediate shaft S5, an eighth driving gear Z12 floatingly arranged on the second intermediate shaft S6, and a fifth driven gear Z13 fixed on an output shaft. The seventh driving gear Z11 and the eighth driving gear Z12 are respectively engaged with the fifth driven gear Z13; The second intermediate gear pair includes a ninth driving gear Z14 floatingly arranged on the first intermediate shaft S5, a tenth driving gear Z15 floatingly arranged on the second intermediate shaft S6, and a sixth driven gear Z16 fixed on an output shaft. The ninth driving gear Z14 and the tenth driving gear Z15 are respectively engaged with the sixth driven gear Z16.
[0027] Further, in some embodiments, as Figure 1 shown, the first shifting device A is located between the first intermediate gear pair and the second intermediate gear pair, and is selectively combined or not combined with the seventh driving gear Z11 or the ninth driving gear Z14; The second shifting device B is located between the first intermediate gear pair and the second intermediate gear pair, and is selectively combined or not combined with the eighth driving gear Z12 or the tenth driving gear Z15.
[0028] In some embodiments, the first shift device A and the second shift device B can shift gears independently of each other, and both have L, N, and R positions.
[0029] Furthermore, in some embodiments, the control logic of each gear is as shown in Table 1.
[0030] Table 1. Control logic of each gear
[0031] Note: “√” in the table indicates the working position of the corresponding shift device in the current working gear.
[0032] Combine the following Figure 1 The examples of the present application are described in detail in Table 1. The gearbox in this embodiment can achieve the following gears: When the first shift device A and the second shift device B are both in the middle position (N position), the gear position N is achieved.
[0033] When the first shift device A is in the R position and the second shift device B is in the R position, the first shift device A is combined with the ninth driving gear Z14 of the second intermediate gear pair, and the second shift device B is combined with the tenth driving gear Z15 of the second intermediate gear pair; the power of the first motor EM1 and the second motor EM2 is transmitted to the first intermediate shaft S5 through the first input gear pair and the second input gear pair, and then transmitted to the output shaft through the second intermediate gear pair, the power of the third motor EM3 and the fourth motor EM4 is transmitted to the second intermediate shaft S6 through the third input gear pair and the fourth input gear pair, and then transmitted to the output shaft through the second intermediate gear pair, and the power of the two is converged and outputted from the output shaft S7 together, realizing the gear 1 (this is the escape gear and heavy load low speed operation gear).
[0034] When the first shift device A is in the L position and the second shift device B is in the L position, the first shift device A is combined with the seventh driving gear Z11 of the first intermediate gear pair, and the second shift device B is combined with the eighth driving gear Z12 of the first intermediate gear pair; the power of the first motor EM1 and the second motor EM2 is transmitted to the first intermediate shaft S5 through the first input gear pair and the second input gear pair, and then transmitted to the output shaft through the first intermediate gear pair; the power of the third motor EM3 and the fourth motor EM4 is transmitted to the second intermediate shaft S6 through the third input gear pair and the fourth input gear pair, and then transmitted to the output shaft through the first intermediate gear pair. After the power of the two is merged, they are output from the output shaft S7 together to achieve gear position 2 (at this time, it is a light load high-speed working gear or a high-speed driving gear).
[0035] When shifting from gear position N to gear position 1, the first shifting device A performs the operation of switching the working mode from N to R, and the second shifting device B simultaneously performs the operation of switching the working mode from N to R. Thus, the gear shift from gear position N to gear position 1 is completed. Then, the first motor EM1, the second motor EM2, the third motor EM3, and the fourth motor EM4 are started. The power of the first motor EM1 and the second motor EM2 passes through the first intermediate shaft and then is transmitted to the output shaft through the second intermediate gear pair. The power of the third motor EM3 and the fourth motor EM4 passes through the second intermediate shaft and then is transmitted to the output shaft through the second intermediate gear pair. After the two powers are confluent, they are jointly output from the output shaft.
[0036] When shifting from gear position 1 to gear position N, the first motor EM1, the second motor EM2, the third motor EM3, and the fourth motor EM4 are all disengaged from the power. The first shifting device A performs the operation of switching the working mode from R to N, and the second shifting device B simultaneously performs the operation of switching the working mode from N to R. Thus, the gear shift from gear position 1 to gear position N is completed.
[0037] When shifting from gear position 1 to gear position 2, the first motor EM1 and the second motor EM2 are first disengaged from the power. The first shifting device A performs the operation of switching the working mode from R to L. At this time, the power of the third motor EM3 and the fourth motor EM4 passes through the second intermediate shaft and then is transmitted to the output shaft through the second intermediate gear pair. After the switching is completed, the first motor EM1 and the second motor EM2 provide power, which passes through the first intermediate shaft and then is transmitted to the output shaft through the first intermediate gear pair. Then, the third motor EM3 and the fourth motor EM4 are first disengaged from the power, and the second shifting device B performs the operation of switching the working mode from R to L. After the operation is completed, the third motor EM3 and the fourth motor EM4 resume power and pass through the second intermediate shaft and then are transmitted to the output shaft through the first intermediate gear pair. The power is confluent with the power transmitted from the first motor EM1 and the second motor EM2 through the first intermediate shaft and then through the first intermediate gear pair to the output shaft and is jointly output. Thus, the gear shift from gear position 1 to gear position 2 is completed.
[0038] When shifting from gear position 2 to gear position 1, the first motor EM1 and the second motor EM2 are first disengaged from the power. The first shifting device A performs the operation of switching the working mode from R to L. At this time, the power of the third motor EM3 and the fourth motor EM4 passes through the second intermediate shaft and then is transmitted to the output shaft through the second intermediate gear pair. After the switching is completed, the first motor EM1 and the second motor EM2 provide power, which passes through the first intermediate shaft and then is transmitted to the output shaft through the first intermediate gear pair. Then, the third motor EM3 and the fourth motor EM4 are first disengaged from the power, and the second shifting device B performs the operation of switching the working mode from R to L. After the operation is completed, the third motor EM3 and the fourth motor EM4 resume power and pass through the second intermediate shaft and then are transmitted to the output shaft through the first intermediate gear pair. The power is confluent with the power transmitted from the first motor EM1 and the second motor EM2 through the first intermediate shaft and then through the first intermediate gear pair to the output shaft and is jointly output. Thus, the gear shift from gear position 1 to gear position 2 is completed.
[0039] During the process of switching between gear position 1 and gear position 2, when the shifting device that disconnects the power and operates on one side of the intermediate shaft switches the mode, the other intermediate shaft shifting device remains stationary to achieve continuous output of the output power, so as to achieve uninterrupted shifting power.
[0040] The four-motor two-speed electric drive gearbox in this application includes 4 input motors, four motor connecting shafts (S1~S4), two intermediate shafts (S5, S6), one output shaft (S7), two gear hubs (H1, H2), six gear pairs with a total of 16 gears (Z1~Z16) and 2 shifting devices (A, B), forming two gear positions. A transition gear hub with two fixed gears is added between the motor shaft and the intermediate shaft, so that the power of the motor is transmitted to the intermediate shaft through two-stage meshing output, and then the power is transmitted to the output shaft by the left and right selection of gear pairs by the intermediate shaft shifting device to achieve power output. This transition structure increases the number of meshes, improves the transmission ratio, adapts to the application of high-speed motors. At the same time, the gear hub is floatingly arranged on the output shaft, which also saves the number of shafts, optimizes the spatial structure and reduces the production cost. In addition, the gearbox is driven by four motors in parallel. When performing a shifting operation, the shifting device on one side of the intermediate shaft switches the mode, and the other intermediate shaft shifting device remains stationary to achieve continuous output of the output power, so as to achieve uninterrupted shifting power.
[0041] Embodiment 2: A construction machinery, including the four-motor two-speed electric drive gearbox for construction machinery described in Embodiment 1.
[0042] In some embodiments, the construction machinery may be a new energy mining vehicle.
[0043] The above are only the preferred embodiments of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present application.
Claims
1. A four-motor two-speed electric drive gearbox, characterized in that, Comprising: The first motor outputs power to the first input shaft, the second motor outputs power to the second input shaft, the third motor outputs power to the third input shaft, and the fourth motor outputs power to the fourth input shaft; The first input shaft and the second input shaft are drivingly connected to the first intermediate shaft through the first input gear pair and the second input gear pair, and the third input shaft and the fourth input shaft are drivingly connected to the second intermediate shaft through the third input gear pair and the fourth input gear pair; The first intermediate shaft and the second intermediate shaft are respectively drivingly connected to the output shaft through the first intermediate gear pair and the second intermediate gear pair. The first gear hub and the second gear hub are floatingly mounted on the output shaft. The first input gear pair and the second input gear pair are drivingly connected through the first gear hub, and the third input gear pair and the fourth input gear pair are drivingly connected through the second gear hub; The first shifting device is located on the first intermediate shaft and selectively engages or does not engage with the driving gear on the first side of the first intermediate gear pair or the driving gear on the first side of the second intermediate gear pair. The second shifting device is located on the second intermediate shaft and selectively engages or does not engage with the driving gear on the second side of the first intermediate gear pair or the driving gear on the second side of the second intermediate gear pair to form gear position N, gear position 1, and gear position 2.
2. The four-motor two-speed electric drive gearbox according to claim 1, wherein The first input gear pair includes a first driving gear mounted on the first input shaft, a second driving gear mounted on the second input shaft, and a first driven gear mounted on the first gear hub. The first driving gear and the second driving gear are respectively meshed with the first driven gear; The second input gear pair includes a third driving gear mounted on the first gear hub and a second driven gear mounted on the first intermediate shaft. The third driving gear is meshed with the second driven gear; The first driven gear and the third driving gear are mounted on the first gear hub; The third input gear pair includes a fourth driving gear mounted on the third input shaft, a fifth driving gear mounted on the fourth input shaft, and a third driven gear mounted on the second gear hub. The fourth driving gear and the fifth driving gear are respectively meshed with the third driven gear; The fourth input gear pair includes a sixth driving gear mounted on the second gear hub and a fourth driven gear mounted on the second intermediate shaft. The sixth driving gear is meshed with the fourth driven gear; The third driven gear and the sixth driving gear are mounted on the second gear hub; The first intermediate gear pair includes a seventh driving gear floatingly arranged on the first intermediate shaft, an eighth driving gear floatingly arranged on the second intermediate shaft, and a fifth driven gear mounted on the output shaft. The seventh driving gear and the eighth driving gear are respectively meshed with the fifth driven gear; The second intermediate gear pair includes a ninth driving gear floatingly arranged on the first intermediate shaft, a tenth driving gear floatingly arranged on the second intermediate shaft, and a sixth driven gear mounted on the output shaft. The ninth driving gear and the tenth driving gear are respectively meshed with the sixth driven gear.
3. The four-motor two-speed electric drive gearbox according to claim 2, characterized in that, The first shifting device is located between the first intermediate gear pair and the second intermediate gear pair, and is selectively engaged or disengaged with the seventh driving gear or the ninth driving gear; The second shifting device is located between the first intermediate gear pair and the second intermediate gear pair, and is selectively engaged or disengaged with the eighth driving gear or the tenth driving gear.
4. The four-motor two-speed electric drive gearbox according to claim 1, characterized in that The first shifting device and the second shifting device can shift gears independently of each other, and both have positions L, N, and R.
5. The four-motor two-speed electric drive gearbox according to claim 4, characterized in that, When both the first shifting device and the second shifting device are in the N position, the gear position N is achieved.
6. The four-motor two-speed electric drive gearbox according to claim 5, characterized in that, When the first shifting device is in the R position and the second shifting device is in the R position, the first shifting device is engaged with the ninth driving gear of the second intermediate gear pair, and the second shifting device is engaged with the tenth driving gear of the second intermediate gear pair; the power of the first motor and the second motor is transmitted to the first intermediate shaft through the first input gear pair and the second input gear pair, and then transmitted to the output shaft through the second intermediate gear pair, and the power of the third motor and the fourth motor is transmitted to the second intermediate shaft through the third input gear pair and the fourth input gear pair, and then transmitted to the output shaft through the second intermediate gear pair. After the two powers are confluent, they are jointly output from the output shaft to achieve the gear position 1.
7. The four-motor two-speed electric drive gearbox according to claim 6, characterized in that, When the first shifting device is in the L position and the second shifting device is in the L position, the first shifting device is engaged with the seventh driving gear of the first intermediate gear pair, and the second shifting device is engaged with the eighth driving gear of the first intermediate gear pair; the power of the first motor and the second motor is transmitted to the first intermediate shaft through the first input gear pair and the second input gear pair, and then transmitted to the output shaft through the first intermediate gear pair, and the power of the third motor and the fourth motor is transmitted to the second intermediate shaft through the third input gear pair and the fourth input gear pair, and then transmitted to the output shaft through the first intermediate gear pair. After the two powers are confluent, they are jointly output from the output shaft to achieve the gear position 2.
8. The four-motor two-speed electric drive gearbox according to claim 7, characterized in that, When shifting from the gear position N to the gear position 1, the first shifting device performs the switching operation of the working mode from the N position to the R position, and the second shifting device simultaneously performs the switching operation of the working mode from the N position to the R position. Thus, the gear shifting from the gear position N to the gear position 1 is completed. Start the first motor, the second motor, the third motor and the fourth motor. The power of the first motor and the second motor is transmitted to the output shaft through the second intermediate gear pair after passing through the first intermediate shaft, and the power of the third motor and the fourth motor is transmitted to the output shaft through the second intermediate gear pair after passing through the second intermediate shaft. After the two powers are confluent, they are jointly output from the output shaft.
9. The four-motor two-speed electric drive gearbox according to claim 7, wherein When shifting from the gear position 1 to the gear position N, the first motor, the second motor, the third motor and the fourth motor are all disengaged from the power. The first shifting device performs the switching operation of the working mode from the R position to the N position, and the second shifting device simultaneously performs the switching operation of the working mode from the R position to the N position. Thus, the gear shifting from the gear position 1 to the gear position N is completed.
10. The four-motor two-speed electric drive gearbox according to claim 7, characterized in that, When shifting from the gear position 1 to the gear position 2, the first motor and the second motor are first disengaged from the power. The first shifting device performs the switching operation of the working mode from the R position to the L position. At this time, the power of the third motor and the fourth motor is transmitted to the output shaft through the second intermediate gear pair after passing through the second intermediate shaft; After the shift is completed, the first motor and the second motor provide power. After passing through the first intermediate shaft, the power is transmitted to the output shaft through the first intermediate gear pair. After that, the third motor and the fourth motor first disengage the power, and the second shifting device performs the operation of switching the working mode from the R position to the L position. After the operation is completed, the third motor and the fourth motor resume power. After passing through the second intermediate shaft, the power is transmitted to the output shaft through the first intermediate gear pair. After converging with the power transmitted from the first motor and the second motor to the output shaft through the first intermediate shaft and the first intermediate gear pair, the power is jointly output, thus completing the gear shift from gear 1 to gear 2.
11. The four-motor two-speed electric drive gearbox according to claim 7, characterized in that, When shifting from gear 2 to gear 1, the first motor and the second motor first disengage the power, and the first shifting device performs the operation of switching the working mode from the R position to the L position. At this time, the power of the third motor and the fourth motor is transmitted to the output shaft through the second intermediate shaft and the second intermediate gear pair; After the shift is completed, the first motor and the second motor provide power. After passing through the first intermediate shaft, the power is transmitted to the output shaft through the first intermediate gear pair. After that, the third motor and the fourth motor first disengage the power, and the second shifting device performs the operation of switching the working mode from the R position to the L position. After the operation is completed, the third motor and the fourth motor resume power. After passing through the second intermediate shaft, the power is transmitted to the output shaft through the first intermediate gear pair. After converging with the power transmitted from the first motor and the second motor to the output shaft through the first intermediate shaft and the first intermediate gear pair, the power is jointly output, thus completing the gear shift from gear 1 to gear 2.
12. An engineering machinery, characterized in that, Including the four-motor two-speed electric drive gearbox according to any one of claims 1 to 11.