Four-motor two-gear electric drive gearbox and engineering machinery
By using a four-motor parallel drive and an independent shifting device, the problem of insufficient power and power interruption of high-speed motors in the gearbox is solved, achieving efficient power output and cost optimization, which is suitable for mining vehicles.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU ADVANCED CONSTR MASCH INNOVATION CENT LTD
- Filing Date
- 2025-06-06
- Publication Date
- 2026-04-21
AI Technical Summary
When existing electric drive transmissions are matched with high-speed motors, there are problems such as reduced gear requirements and insufficient power due to the high speed and low torque of the high-speed motor. In addition, power interruption is prone to occur during gear shifting, posing a safety hazard.
Design a four-motor two-speed electric drive gearbox. The four motors are driven in parallel. A transition gear hub is added to increase the number of meshing. The mode is switched on one side of the intermediate shaft through an independent shifting device, while the other side of the intermediate shaft maintains power output to achieve uninterrupted power.
It improves the gearbox's speed ratio adaptability, ensures continuous power output, reduces production costs, and optimizes the spatial structure, making it suitable for mining vehicles with high-speed motors.
Smart Images
Figure CN224150115U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of new energy transmission technology, and relates to a four-motor two-speed electric drive transmission and engineering machinery, specifically a mining four-motor two-speed electric drive transmission and engineering machinery. Background Technology
[0002] Currently, high-speed motors are increasingly widely used in the field of new energy mining trucks due to their advantages of small size, light weight, low cost, and high power density. This places new demands on the matching gearboxes. On the one hand, high-speed motors have a wider speed range for efficient operation, and the motor can work in the high-efficiency range without the need for the gearbox to provide too many gear adjustments. Generally, two gears are sufficient to meet the needs of heavy-load operation and high-speed driving. On the other hand, because high-speed motors have high speed and low torque under the same power conditions, the electric drive gearbox needs to have a large speed ratio to provide sufficient torque to drive the vehicle and ensure that the mining truck has good power performance and climbing ability under heavy-load conditions.
[0003] Furthermore, in actual mining operations, new energy mining trucks often need to climb slopes and traverse complex terrains when fully loaded. Due to limitations in structure and design principles, many traditional electric drive transmissions experience power interruption during gear shifting, which may cause the vehicle to slip on slopes under heavy load, posing a safety hazard. Utility Model Content
[0004] Objective: In view of at least one of the above technical problems, and addressing the issues of wide operating speed range of high-speed motors in mining vehicles, reduced gear requirements for matching transmissions, and the potential for insufficient vehicle power due to high speed and low torque of high-speed motors, this application provides a four-motor two-speed electric drive transmission and engineering machinery.
[0005] Technical solution: To solve the above-mentioned technical problems, the technical solution adopted in this application is as follows:
[0006] In a first aspect, a four-motor, two-speed electric drive gearbox is provided, comprising: a first motor power output to a first input shaft, a second motor power output to a second input shaft, a third motor power output to a third input shaft, and a fourth motor power output to a fourth input shaft; the first and second input shafts are connected to a first intermediate shaft via a first and a second input gear pair, and the third and fourth input shafts are connected to the second intermediate shaft via a third and a fourth input gear pair; the first and second intermediate shafts are respectively connected to an output shaft via a first and a second intermediate gear pair, a first and a second gear hub are floatingly mounted on the output shaft, the first and second input gear pairs are connected via the first gear hub, and the third and fourth input gear pairs are connected via the second gear hub.
[0007] 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 N, gear 1, and gear 2.
[0008] In some embodiments, the first input gear pair includes a first driving gear mounted on a first input shaft, a second driving gear mounted on a second input shaft, and a first driven gear mounted on a first gear hub, wherein the driving gear and the second driving gear mesh with the first driven gear respectively;
[0009] The second input gear pair includes a third driving gear mounted on a first gear hub and a second driven gear mounted on a first intermediate shaft, wherein the third driving gear and the second driven gear mesh; the first driven gear and the third driving gear are mounted on the first gear hub.
[0010] 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 mesh with the third driven gear, respectively.
[0011] 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, wherein the sixth driving gear and the fourth driven gear mesh; the third driven gear and the sixth driving gear are mounted on the second gear hub.
[0012] The first intermediate gear pair includes a seventh driving gear floating on a first intermediate shaft, an eighth driving gear floating on a second intermediate shaft, and a fifth driven gear mounted on an output shaft. The seventh driving gear and the eighth driving gear mesh with the fifth driven gear, respectively.
[0013] The second intermediate gear pair includes a ninth driving gear floating on the first intermediate shaft, a tenth driving gear floating on the second intermediate shaft, and a sixth driven gear mounted on the output shaft. The ninth driving gear and the tenth driving gear mesh with the sixth driven gear, respectively.
[0014] In some embodiments, the first shifting device is located between the first intermediate gear pair and the second intermediate gear pair, and may or may not engage with the seventh drive gear or the ninth drive gear.
[0015] The second shifting device is located between the first intermediate gear pair and the second intermediate gear pair, and can selectively engage or disengage with the eighth or tenth drive gear.
[0016] In some embodiments, the first shifting device and the second shifting device can shift gears independently of each other, and each has L, N, and R positions.
[0017] When both the first and second shifting devices are in position N, gear N is achieved.
[0018] When the first shifting device is in position R and the second shifting device is in position R, 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 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 to the output shaft through the second intermediate gear pair. The power of the two motors merges and is output from the output shaft together, realizing gear 1.
[0019] When the first shifting device is in position L and the second shifting device is in position L, 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 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 to the output shaft through the first intermediate gear pair. The power of the two motors merges and is output from the output shaft together, realizing gear 2.
[0020] When shifting from gear N to gear 1, the first shifting device performs a shift operation from N to R, and the second shifting device simultaneously performs a shift operation from N to R. This completes the shift from gear N to gear 1, activating the first, second, third, and fourth motors. The power from the first and second motors is transmitted to the output shaft via the first intermediate shaft and the second intermediate gear pair, and the power from the third and fourth motors is transmitted to the output shaft via the second intermediate shaft and the second intermediate gear pair. The combined power from both motors is then output from the output shaft.
[0021] When shifting from gear 1 to gear N, the first motor, second motor, third motor and fourth motor are all disengaged from power. The first shifting device performs the R-position to N-position working mode switching operation, and the second shifting device simultaneously performs the N-position to R-position working mode switching operation, thus completing the shift from gear 1 to gear N.
[0022] When shifting from gear 1 to gear 2, the first and second motors first disengage their power, and the first shifting device performs an R-position to L-position working mode switching operation. At this time, the power of the third and fourth motors is transmitted to the output shaft through the second intermediate shaft and the second intermediate gear pair. After the shift is completed, the first and second motors provide power, which is transmitted to the output shaft through the first intermediate shaft and the first intermediate gear pair. Then, the third and fourth motors disengage their power again, and the second shifting device performs an R-position to L-position working mode switching operation. After the operation is completed, the third and fourth motors regain power, which is transmitted to the output shaft through the second intermediate shaft and the first intermediate gear pair. The power transmitted to the output shaft by the first and second motors through the first intermediate shaft and the first intermediate gear pair is combined and output together, thus completing the shift from gear 1 to gear 2.
[0023] When shifting from gear 2 to gear 1, the first and second motors first disengage their power, and the first shifting device performs the R-position to L-position working mode switching operation. At this time, the power of the third and fourth motors is transmitted to the output shaft through the second intermediate shaft and the second intermediate gear pair. After the shift is completed, the first and second motors provide power, which is transmitted to the output shaft through the first intermediate shaft and the first intermediate gear pair. Then, the third and fourth motors disengage their power, and the second shifting device performs the R-position to L-position working mode switching operation. After the operation is completed, the third and fourth motors regain power, which is transmitted to the output shaft through the second intermediate shaft and the first intermediate gear pair. The power transmitted to the output shaft by the first and second motors through the first intermediate shaft and the first intermediate gear pair is combined and output together, thus completing the shift from gear 1 to gear 2.
[0024] Secondly, an engineering machinery is provided, including the aforementioned four-motor two-speed electric drive gearbox.
[0025] In some embodiments, the engineering machinery is a new energy mining truck.
[0026] Beneficial Effects: The four-motor two-speed electric drive gearbox and engineering machinery provided in this application have the following advantages: It includes four input motors, four motor connecting shafts, two intermediate shafts, one output shaft, two gear hubs, six gear pairs, and two shifting devices, forming two gear positions. A transition gear hub with two fixed gears is added between the motor shaft and the intermediate shaft, allowing the motor power to be transmitted to the intermediate shaft through two stages of meshing. Then, the power is transmitted to the output shaft via the left and right selection gear pairs of the intermediate shaft shifting device, achieving power output. This transition structure increases the number of meshing operations, improves the transmission speed ratio, and is suitable for high-speed motor applications. Simultaneously, the floating arrangement of the gear hub on the output shaft saves on the number of shafts, optimizes the spatial structure, and reduces production costs. Furthermore, the gearbox is driven by four motors in parallel. During gear shifting operations, the shifting device on one intermediate shaft switches modes, while the shifting device on the other intermediate shaft remains stationary, ensuring continuous power output and uninterrupted shifting power. Attached Figure Description
[0027] Figure 1 This is a schematic diagram of the principle of a four-motor two-speed electric drive gearbox according to one embodiment of this application;
[0028] In the diagram: 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 Implementation
[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.
[0030] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.
[0031] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.
[0032] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.
[0033] This application addresses the issue of the wide operating speed range of high-speed motors in mining vehicles and the reduced gear requirements for matching transmissions by providing a two-speed transmission. To address the problem of insufficient overall vehicle power caused by the high speed and low torque of high-speed motors, a four-motor drive scheme is provided. Furthermore, a transition gear hub with two fixed gears is added between the motor input shaft and the intermediate shaft, increasing the number of engagements for each gear to three, one more than the traditional two engagements, thus expanding the speed ratio. To ensure uninterrupted power output for mining vehicles, a power transmission path with separate power outputs from two intermediate shafts is selected. During gear shifting, the shifting device on one intermediate shaft switches modes while the shifting device on the other intermediate shaft remains stationary, ensuring continuous power output during gear shifting.
[0034] Example 1: As Figure 1 As 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 shifting device A, and a second shifting device B.
[0035] The first motor EM1 outputs power to the first input shaft S1, the second motor EM2 outputs power to the second input shaft S2, the third motor EM3 outputs power to the third input shaft S3, and the fourth motor EM4 outputs power 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 via the first and second input gear pairs. The third input shaft S3 and the fourth input shaft S4 are connected to the second intermediate shaft S6 via the third and fourth input gear pairs. The first intermediate shaft S5 and the second intermediate shaft S6 are connected to the output shaft S7 via the first and second intermediate gear pairs, respectively. The first gear hub H1 and the second gear hub H2 are floatingly mounted on the output shaft S7. The first input gear pair and the second input gear pair are connected via the first gear hub H1, and the third input gear pair and the fourth input gear pair are connected via the second gear hub H2.
[0036] The first shifting device A is located on the first intermediate shaft S5 and selectively engages or disengages with the driving gears (seventh driving gear Z11 and ninth driving gear Z14) on the first side of the first intermediate gear pair and the second intermediate gear pair. The second shifting device B is located on the second intermediate shaft S6 and selectively engages or disengages with the driving gears (eighth driving gear Z12 and tenth driving gear Z15) on the second side of the first intermediate gear pair and the second intermediate gear pair, so as to form gear N, gear 1, and gear 2.
[0037] In some embodiments, such as Figure 1 As shown, the first input gear pair includes a first driving gear Z1 fixed on the first input shaft S1, a second driving gear Z2 fixed on the second input shaft S2, and a first driven gear Z3 fixed on the first gear hub H1. The driving gear Z1 and the second driving gear Z2 mesh with the first driven gear Z3 respectively.
[0038] 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 the first intermediate shaft S5, wherein the third driving gear Z4 and the second driven gear Z5 mesh; the first driven gear Z3 and the third driving gear Z4 are fixedly mounted on the first gear hub H1.
[0039] The third input gear pair includes a fourth driving gear Z6 fixed on the third input shaft S3, a fifth driving gear Z7 fixed on the fourth input shaft S4, and a third driven gear Z8 fixed on the second gear hub H2. The fourth driving gear Z6 and the fifth driving gear Z7 mesh with the third driven gear Z8 respectively.
[0040] The fourth input gear pair includes a sixth driving gear Z9 fixed on the second gear hub body H2 and a fourth driven gear Z10 fixed on the second intermediate shaft S6, the sixth driving gear Z9 and the fourth driven gear Z10 meshing; the third driven gear Z8 and the sixth driving gear Z9 are fixedly mounted on the second gear hub body H2;
[0041] The first intermediate gear pair includes a seventh driving gear Z11 floating on the first intermediate shaft S5, an eighth driving gear Z12 floating on the second intermediate shaft S6, and a fifth driven gear Z13 fixed on the output shaft. The seventh driving gear Z11 and the eighth driving gear Z12 mesh with the fifth driven gear Z13 respectively.
[0042] The second intermediate gear pair includes a ninth driving gear Z14 floating on the first intermediate shaft S5, a tenth driving gear Z15 floating on the second intermediate shaft S6, and a sixth driven gear Z16 fixed on the output shaft. The ninth driving gear Z14 and the tenth driving gear Z15 mesh with the sixth driven gear Z16 respectively.
[0043] Furthermore, in some embodiments, such as Figure 1 As shown, the first shifting device A is located between the first intermediate gear pair and the second intermediate gear pair, and can selectively engage or disengage with the seventh driving gear Z11 or the ninth driving gear Z14;
[0044] The second shifting device B is located between the first intermediate gear pair and the second intermediate gear pair, and can selectively engage or disengage with the eighth drive gear Z12 or the tenth drive gear Z15.
[0045] In some embodiments, the first shifting device A and the second shifting device B can shift gears independently of each other, and each has L, N, and R positions.
[0046] Furthermore, in some embodiments, the control logic for each gear position is shown in Table 1.
[0047] Table 1. Control Logic for Each Gear Position
[0048]
[0049] Note: "√" in the table indicates the working position of the corresponding gear shifting device in the current working gear.
[0050] The following is combined Figure 1 Table 1 provides a detailed description of examples of this application. The gearbox in this embodiment can achieve the following gears:
[0051] When both the first shifting device A and the second shifting device B are in the neutral position (N position), gear N is achieved.
[0052] When the first shifting device A and the second shifting device B are both in the R position, the first shifting device A engages with the ninth driving gear Z14 of the second intermediate gear pair, and the second shifting device B engages 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 via the first input gear pair and the second input gear pair, and then to the output shaft via 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 via the third input gear pair and the fourth input gear pair, and then to the output shaft via the second intermediate gear pair. After the power of the two motors merges, they are output from the output shaft S7, realizing gear 1 (which is the gear for getting out of trouble and the gear for heavy-load low-speed operation).
[0053] When the first shifting device A and the second shifting device B are both in the L position, the first shifting device A engages with the seventh driving gear Z11 of the first intermediate gear pair, and the second shifting device B engages 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 via the first and second input gear pairs, and then to the output shaft via 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 via the third and fourth input gear pairs, and then to the output shaft via the first intermediate gear pair. After the power of the two motors merges, they are output from the output shaft S7, realizing gear 2 (at this time, it is a light-load high-speed working gear or a high-speed driving gear).
[0054] When shifting from gear N to gear 1, the first shifting device A performs an N→R working mode switching operation, and the second shifting device B simultaneously performs an N→R working mode switching operation. This completes the gear shift from gear N to gear 1, activating the first motor EM1, the second motor EM2, the third motor EM3, and the fourth motor EM4. The power from the first motor EM1 and the second motor EM2 is transmitted to the output shaft via the first intermediate shaft and the second intermediate gear pair. The power from the third motor EM3 and the fourth motor EM4 is transmitted to the output shaft via the second intermediate shaft and the second intermediate gear pair. The power from both motors merges and is output from the output shaft.
[0055] When shifting from gear 1 to gear N, the first motor EM1, the second motor EM2, the third motor EM3, and the fourth motor EM4 are all disengaged from power. The first shifting device A performs the R→N working mode switching operation, and the second shifting device B simultaneously performs the N→R working mode switching operation. This completes the shift from gear 1 to gear N.
[0056] When shifting from gear 1 to gear 2, the first motor EM1 and the second motor EM2 first disengage their power, and the first shifting device A performs the R→L working mode switching operation. At this time, the power of the third motor EM3 and the fourth motor EM4 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 EM1 and the second motor EM2 provide power, which is transmitted to the output shaft through the first intermediate shaft and the first intermediate gear pair. Then, the third motor EM3 and the fourth motor EM4 disengage their power, and the second shifting device B performs the R→L working mode switching operation. After the operation is completed, the third motor EM3 and the fourth motor EM4 regain power, which is transmitted to the output shaft through the second intermediate shaft and the first intermediate gear pair. The power transmitted to the output shaft by the first motor EM1 and the second motor EM2 through the first intermediate shaft and the first intermediate gear pair is combined and output together, thus completing the shift from gear 1 to gear 2.
[0057] When shifting from gear 2 to gear 1, the first motor EM1 and the second motor EM2 first disengage their power, and the first shifting device A performs the R→L working mode switching operation. At this time, the power of the third motor EM3 and the fourth motor EM4 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 EM1 and the second motor EM2 provide power, which is transmitted to the output shaft through the first intermediate shaft and the first intermediate gear pair. Then, the third motor EM3 and the fourth motor EM4 disengage their power, and the second shifting device B performs the R→L working mode switching operation. After the operation is completed, the third motor EM3 and the fourth motor EM4 regain power, which is transmitted to the output shaft through the second intermediate shaft and the first intermediate gear pair. The power transmitted to the output shaft by the first motor EM1 and the second motor EM2 through the first intermediate shaft and the first intermediate gear pair is combined and output together, thus completing the shift from gear 1 to gear 2.
[0058] During the switching between gear 1 and gear 2, while the power is disconnected and the shifting device on one side of the intermediate shaft is operating to switch modes, the shifting device on the other intermediate shaft remains stationary to ensure continuous power output, thus achieving uninterrupted power shifting.
[0059] The four-motor two-speed electric drive gearbox in this application includes four 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 totaling 16 gears (Z1~Z16), and two 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, allowing the motor power to be transmitted to the intermediate shaft via two stages of meshing. Then, the intermediate shaft shifting device selects the left and right gear pairs to transmit power to the output shaft, achieving power output. This transition structure increases the number of meshing operations, improves the transmission speed ratio, and is suitable for high-speed motor applications. Simultaneously, the gear hub is floating on the output shaft, saving the number of shafts, optimizing the spatial structure, and reducing production costs. Furthermore, the gearbox is driven by four motors in parallel. During gear shifting operations, the shifting device on one intermediate shaft switches modes, while the shifting device on the other intermediate shaft remains stationary, ensuring continuous power output and uninterrupted shifting power.
[0060] Example 2: An engineering machine, including the four-motor two-speed electric drive gearbox for engineering machinery described in Example 1.
[0061] In some embodiments, the engineering machinery may be a new energy mining truck.
[0062] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.
Claims
1. A four-motor, two-speed electric drive gearbox, characterized in that, include: 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 and second input shafts are connected to the first intermediate shaft via the first and second input gear pairs. The third and fourth input shafts are connected to the second intermediate shaft via the third and fourth input gear pairs. The first and second intermediate shafts are connected to the output shaft via the first and second intermediate gear pairs, respectively. The first and second gear hubs are floatingly mounted on the output shaft. The first and second input gear pairs are connected via the first gear hub, and the third and fourth input gear pairs are connected via the second gear hub. 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 N, gear 1, and gear 2.
2. The four-motor two-speed electric drive gearbox according to claim 1, characterized in that, The first input gear pair includes a first driving gear mounted on a first input shaft, a second driving gear mounted on a second input shaft, and a first driven gear mounted on a first gear hub. The driving gear and the second driving gear mesh with the first driven gear, respectively. 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, wherein the third driving gear and the second driven gear mesh. 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 mesh with the third driven gear, respectively. 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, wherein the sixth driving gear and the fourth driven gear mesh. 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 floating on a first intermediate shaft, an eighth driving gear floating on a second intermediate shaft, and a fifth driven gear mounted on an output shaft. The seventh driving gear and the eighth driving gear mesh with the fifth driven gear, respectively. The second intermediate gear pair includes a ninth driving gear floating on the first intermediate shaft, a tenth driving gear floating on the second intermediate shaft, and a sixth driven gear mounted on the output shaft. The ninth driving gear and the tenth driving gear mesh with the sixth driven gear, respectively.
3. The four-motor two-gear electrically-driven transmission 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 can selectively engage or disengage with the seventh or ninth drive gear; The second shifting device is located between the first intermediate gear pair and the second intermediate gear pair, and can selectively engage or disengage with the eighth or tenth drive gear.
4. The four-motor two-gear electrically-driven transmission 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 L, N, and R positions.
5. The four-motor two-gear electrically-driven transmission according to claim 4, characterized in that, When both the first and second shifting devices are in position N, gear N is achieved.
6. The four-motor two-gear electrically-driven transmission according to claim 5, characterized in that, When the first shifting device is in position R and the second shifting device is in position R, 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 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 to the output shaft through the second intermediate gear pair. The power of the two motors merges and is output from the output shaft together, realizing gear 1.
7. The four-motor two-gear electrically driven transmission according to claim 6, characterized in that, When the first shifting device is in position L and the second shifting device is in position L, 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 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 to the output shaft through the first intermediate gear pair. The power of the two motors merges and is output from the output shaft together, realizing gear 2.
8. The four-motor two-gear electrically-driven transmission according to claim 7, characterized in that, When shifting from gear N to gear 1, the first shifting device performs a shift operation from N to R, and the second shifting device simultaneously performs a shift operation from N to R. This completes the shift from gear N to gear 1, activating the first, second, third, and fourth motors. The power from the first and second motors is transmitted to the output shaft via the first intermediate shaft and the second intermediate gear pair, and the power from the third and fourth motors is transmitted to the output shaft via the second intermediate shaft and the second intermediate gear pair. The combined power from both motors is then output from the output shaft.
9. The four-motor two-speed electric drive gearbox according to claim 7, characterized in that, When shifting from gear 1 to gear N, the first motor, second motor, third motor and fourth motor are all disengaged from power. The first shifting device performs the R-position to N-position working mode switching operation, and the second shifting device simultaneously performs the N-position to R-position working mode switching operation, thus completing the shift from gear 1 to gear N.
10. The four-motor two-gear electrically-driven transmission according to claim 7, characterized in that, When shifting from gear 1 to gear 2, the first motor and the second motor are first disconnected from power, and the first shifting device performs the R position to L position working mode switching operation. 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 switch is completed, the first and second motors provide power, which is transmitted to the output shaft through the first intermediate shaft and the first intermediate gear pair. Then, the third and fourth motors are disengaged from power, and the second shifting device performs the R-position to L-position working mode switching operation. After the operation is completed, the third and fourth motors regain power, which is transmitted to the output shaft through the second intermediate shaft and the first intermediate gear pair. The power transmitted to the output shaft by the first and second motors through the first intermediate shaft and the first intermediate gear pair is combined and output together, thus completing the shift from gear 1 to gear 2.
11. The four-motor two-gear electrically-driven transmission according to claim 7, characterized in that, When shifting from gear 2 to gear 1, the first motor and the second motor are disengaged from power. The first shifting device performs the R-position to L-position working mode switching operation. 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 switch is completed, the first and second motors provide power, which is transmitted to the output shaft through the first intermediate shaft and the first intermediate gear pair. Then, the third and fourth motors are disengaged from power, and the second shifting device performs the R-position to L-position working mode switching operation. After the operation is completed, the third and fourth motors regain power, which is transmitted to the output shaft through the second intermediate shaft and the first intermediate gear pair. The power transmitted to the output shaft by the first and second motors through the first intermediate shaft and the first intermediate gear pair is combined and output together, thus completing the shift from gear 1 to gear 2.
12. A working machine, characterized in that Including the four-motor two-speed electric drive gearbox as described in any one of claims 1 to 11.