Driving system and driving method

Abstract

The invention provides a driving system. The driving system comprises a speed reducer, a plurality of motors and a support. The speed reducer comprises a front cover and a shell, an output gear and a plurality of input gears meshed with the output gear are arranged in the shell, and the input gears are evenly distributed in the circumferential direction of the output gear. An output through hole is formed in the front cover, and an output shaft of the output gear extends to the outer side of the front cover through the output through hole; an input through hole is formed in the shell, and an input shaft of the input gear extends to the outer side of the shell through the input through hole; axes of the output shaft and the input shaft are parallel; the plurality of input gears are in one-to-one correspondence with the plurality of motors; a driving shaft of the motor is coupled with the input shaft and is used for driving the input gear to rotate and driving the output gear to rotate; the support is arranged on the sides, away from the speed reducer, of the motors and used for fixedly connecting the ends, away from the speed reducer, of the motors. The invention further provides a driving method. Large torque output of the driving system is achieved, and the reliability of the driving system is further improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of new energy technology, in particular to a driving system and a driving method. BACKGROUND

[0002] With the popularization of new energy technology, the performance requirements such as torque of the driving system for providing power for new energy engineering machinery are getting higher and higher; in addition, the reliability of the driving system is also an important factor for evaluating the performance of new energy engineering machinery.

[0003] Some driving systems adopt a single motor + single gear reducer architecture, which cannot provide large torque output, and when applied to new energy engineering machinery such as new energy mining trucks, there are problems such as insufficient climbing ability and difficulty in escaping from trouble. Some driving systems adopt a single motor + multi-gear reducer architecture, which requires frequent gear shifting and has a high failure rate.

[0004] How to make the driving system not only provide large torque output, but also reduce the failure rate has become a problem to be solved. SUMMARY

[0005] The present disclosure provides a driving system and a driving method.

[0006] In a first aspect, the present disclosure provides a driving system, comprising a reducer and a plurality of motors; the reducer comprises a front cover and a housing, the housing is provided with an output gear and a plurality of input gears meshing with the output gear, and the plurality of input gears are uniformly distributed along the axial direction of the output gear; the front cover is provided with an output through hole, and the output shaft of the output gear extends to the outside of the front cover through the output through hole; the housing is provided with an input through hole, and the input shaft of the input gear extends to the outside of the housing through the input through hole; the axis of the output shaft and the input shaft are parallel; the plurality of input gears correspond one-to-one to the plurality of motors; the driving shaft of the motor is coupled with the input shaft for driving the input gear to rotate and driving the output gear to rotate; the support is arranged on the side of the plurality of motors away from the reducer for connecting and fixing the end of the plurality of motors away from the reducer.

[0007] In some embodiments, the input shaft is provided with a first coupling part at one end close to the driving shaft, and the driving shaft is provided with a second coupling part at one end close to the input shaft; the first coupling part and the second coupling part are matched to fixedly connect the input shaft and the driving shaft and limit the relative rotation of the input shaft and the driving shaft around the shaft.

[0008] In some embodiments, the first coupling part comprises a coupling groove, at least one first protruding part and at least one first recessed part are arranged on the inner wall of the coupling groove, the first protruding part extends in the axial direction, the first recessed part extends in the axial direction, and the first protruding part and the first recessed part are alternately arranged on the inner wall of the coupling groove; the second coupling part comprises a coupling head, at least one second protruding part and at least one second recessed part are arranged on the outer wall of the coupling head, the second protruding part extends in the axial direction, the second recessed part extends in the axial direction, and the second protruding part and the second recessed part are alternately arranged on the outer wall of the coupling head; the coupling groove is sleeved with the coupling head, the first protruding part is matched with the second recessed part, the first recessed part is matched with the second protruding part, the input shaft and the driving shaft are fixedly connected, and the relative rotation of the input shaft and the driving shaft around the shaft is limited.

[0009] In some embodiments, a positioning hole seat is arranged on the side of the shell away from the front cover, and the input through hole is arranged in the positioning hole seat; a positioning boss is arranged on the end of the motor casing close to the reducer; the positioning boss is matched with the positioning hole seat to positionally connect the motor and the reducer.

[0010] In some embodiments, the driving system further comprises a plurality of bolts, and the motor and the reducer are fixedly connected through the bolts.

[0011] In some embodiments, the driving system comprises four motors, and the four motors are arranged in an array on the side of the reducer away from the front cover.

[0012] In some embodiments, the motor casing of the motor is provided with a junction box at the end away from the reducer, and the stator outgoing line arranged in the motor casing is electrically connected with a high-voltage cable through the junction box.

[0013] In some embodiments, the motor casing of the motor comprises an inner casing and an outer casing, and the inner casing is sleeved in the outer casing; a cooling water channel is arranged between the inner casing and the outer casing, and the water inlet and the water outlet of the cooling water channel are arranged at the end of the motor casing away from the reducer.

[0014] In some embodiments, at the end of the motor casing away from the reducer, the water inlet and the water outlet are arranged on opposite sides.

[0015] In some embodiments, the driving system further comprises a support arranged on the side of the plurality of motors away from the reducer, and the support is used for fixedly connecting the end of the plurality of motors away from the reducer.

[0016] In some embodiments, the support frame comprises a central sub-support frame and four edge sub-support frames; the central sub-support frame is arranged at the center of the four motors and is used to connect the four motors to each other at the end away from the speed reducer; the edge sub-support frames are arranged between two of the four motors and are used to connect the four motors to each other in pairs.

[0017] In some embodiments, the support frame comprises an integrated support frame which is fixedly connected to the end of the four motors away from the speed reducer and the side surface of the motors.

[0018] In some embodiments, the integrated support frame comprises a support frame body which comprises a bottom surface and a side wall arranged on one side of the bottom surface, and the bottom surface and the side wall form a cavity; two intersecting first reinforcing ribs are arranged in the cavity, and the first reinforcing ribs divide the cavity into four sub-cavities, each of which corresponds to one of the motors; at least one second reinforcing rib is arranged in the sub-cavity; a component through hole is formed in the bottom surface corresponding to the sub-cavity, and is used to accommodate a component on the end of the motor away from the speed reducer; the support frame body further comprises a protruding portion arranged on the side opposite to the bottom surface and the side wall; at least one of the bottom surface, the side wall, the first reinforcing ribs and the second reinforcing ribs is provided with a first bolt hole for mounting a bolt connected to the end of the motor away from the speed reducer; the protruding portion is provided with a second bolt hole for mounting a bolt connected to the side surface of the motor.

[0019] In some embodiments, the four motors are all synchronous motors or all asynchronous motors.

[0020] In some embodiments, the four motors comprise two synchronous motors arranged along one diagonal line and two asynchronous motors arranged along another diagonal line.

[0021] In the second aspect, the embodiments of the present disclosure provide a driving method of a driving system, and the driving system is the driving system of the first aspect of the embodiments of the present disclosure; the driving method comprises: controlling at least one motor of the driving system to work, driving the input gear of the driving system to rotate, and driving the output gear and the output shaft of the driving system to rotate.

[0022] In some embodiments, the driving system comprises four motors; the controlling at least one motor of the driving system to work comprises: controlling two motors in a central symmetric position to work simultaneously, or controlling the four motors to work simultaneously.

[0023] In the embodiment of the present disclosure, the driving system comprises a reducer and a plurality of motors, the reducer is capable of converting the rotation input by the plurality of motors into the rotation output by the output shaft, in the reducer, the plurality of input gears are uniformly distributed, so that the intermediate bearing in the reducer bears smaller radial force, which is beneficial to reduce vibration, realizes large torque and high speed output of the driving system, and improves the reliability of the driving system; and it is also beneficial to select smaller intermediate bearing, thereby saving cost. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 FIG. 1 is a structural schematic diagram of a driving system in an embodiment of the present disclosure;

[0025] Figure 2 FIG. 2 is a layout schematic diagram of gears in a reducer in an embodiment of the present disclosure;

[0026] Figure 3 FIG. 3 is an exploded schematic diagram of a driving system in an embodiment of the present disclosure;

[0027] Figure 4 FIG. 4 is a schematic diagram of an axial outgoing line in an embodiment of the present disclosure;

[0028] Figure 5 FIG. 5 is a schematic diagram of a split type support in an embodiment of the present disclosure;

[0029] Figure 6 FIG. 6 is a schematic diagram of an integrated type support in an embodiment of the present disclosure;

[0030] Figure 7 FIG. 7 is a three-dimensional schematic diagram of an integrated type support in an embodiment of the present disclosure;

[0031] Figure 8 FIG. 8 is a front view of an integrated type support in an embodiment of the present disclosure;

[0032] Figure 9 FIG. 9 is a rear view of an integrated type support in an embodiment of the present disclosure;

[0033] Figure 10 FIG. 10 is a side view of an integrated type support in an embodiment of the present disclosure;

[0034] Figure 11 FIG. 11 is a schematic diagram of a motor layout in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0035] In order for those skilled in the art to better understand the technical solutions of the present disclosure, the technical solutions of the present disclosure are described in detail below with reference to the drawings.

[0036] Example embodiments will be described more fully hereinafter with reference to the accompanying drawings; this Example embodiments may, however, be embodied in different forms, and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided as non-limiting examples so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0037] In the case of no conflict, various embodiments and various features in the embodiments of the present disclosure can be mutually combined.

[0038] As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0039] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0040] The embodiments described herein can be described with reference to plan views and / or cross-sectional views by virtue of the fact that the present disclosure is directed to ideal schematic illustrations. Thus, the example illustrations are not necessarily drawn to scale and certain aspects can be exaggerated or omitted in order to portray a clear and concise description of at least one embodiment. Therefore, the embodiments are not limited to the specific illustrative examples described herein but include modifications, combinations, equivalents, and / or alternatives within the spirit and scope of the disclosure.

[0041] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure and will not be interpreted in an overly literal or overly formal sense unless expressly so defined herein.

[0042] Figure 1 is a structural schematic diagram of a drive system in an embodiment of the present disclosure, Figure 2 is a layout schematic diagram of a gear in a reducer in an embodiment of the present disclosure.

[0043] As Figure 1 and Figure 2As shown, the drive system comprises a reducer 1 and a plurality of motors 2; the reducer 1 comprises a front cover 11 and a housing 12, the housing 12 is provided with an output gear 3 and a plurality of input gears 4, the plurality of input gears 4 are uniformly distributed along the axial direction of the output gear 3 and are respectively engaged with the output gear 3. The front cover 11 is provided with an output through hole, and the output shaft 31 of the output gear 3 extends to the outside of the front cover through the output through hole; the housing 12 is provided with an input through hole, and the input shaft 41 of the input gear 4 extends to the outside of the housing 12 through the input through hole; the axis of the output shaft 31 is parallel to the axis of the input shaft 41. The plurality of input gears 4 correspond to the plurality of motors 2 one by one, and the driving shaft 21 of the motor 2 is coupled with the input shaft 41. When the motor 2 works, the driving shaft 21 rotates to drive the input shaft 41, the input gear 4, and then the output gear 3 and the output gear 31 rotate.

[0044] The number of motors 2 in the drive system is not specially limited in the embodiment of the present disclosure. The number of motors 2 in the drive system can be two, three, four, five, etc. For example, the drive system comprises four motors 2, and the four motors are arranged at the four vertex positions of a rectangle.

[0045] In the embodiment of the present disclosure, the drive system comprises a reducer 1 and a plurality of motors 2, and the reducer 1 can convert the rotation input by the plurality of motors 2 into the rotation of the output shaft. In the reducer 1, the plurality of input gears 4 are uniformly distributed, so that the intermediate bearing in the reducer 1 bears smaller radial force, which is beneficial to reduce vibration, realize large torque and high speed output of the drive system, and improve the reliability of the drive system; and it is also beneficial to select smaller intermediate bearing, thereby saving cost.

[0046] In some embodiments, the reducer 1 and the motor 2 are independent and detachable from each other, the housing 12 of the reducer 1 and the motor shell of the motor 2 are independent of each other, and each motor 2 is an independent and complete product.

[0047] In some embodiments, the reducer 1 and the motor 2 are integrated into an integrated structure. For example, the motor shells of the plurality of motors 2 are arranged on the side of the housing 12 of the reducer 1 away from the front cover 11, and the plurality of motor shells and the housing 12 are integrated into an integrated structure.

[0048] The embodiment of the present disclosure does not specially limit this.

[0049] The embodiment of the present disclosure does not specially limit how the driving shaft 21 is coupled with the input shaft 41.

[0050] Figure 3 is a disassembly schematic view of a drive system in the embodiment of the present disclosure.

[0051] As Figure 3As shown, the input shaft 41 is provided with a first coupling part 411 near one end of the driving shaft 21, and the driving shaft 21 is provided with a second coupling part 211 near one end of the input shaft 41; the first coupling part 411 cooperates with the second coupling part 211 to fixedly connect the input shaft 41 and the driving shaft 21, and limit the relative rotation of the input shaft 41 and the driving shaft 21 around the shaft.

[0052] The specific structure of the first coupling part 411 and the second coupling part 211 is not specially limited in the embodiments of the present disclosure. For example, one of the first coupling part 411 and the second coupling part 211 is an inner polygonal groove structure, and the other is an outer polygonal head structure. The inner polygonal groove structure is sleeved outside the outer polygonal head structure, and the two cooperate with each other to limit the relative rotation of the input shaft 41 and the driving shaft 21 around the shaft. In the embodiments of the present disclosure, the inner polygonal groove structure and the outer polygonal head structure can be triangular, quadrangular, pentagonal, etc., and the embodiments of the present disclosure do not specially limit this.

[0053] In some embodiments, the first coupling part 411 includes a coupling groove, at least one first protruding part and at least one first recessed part are arranged on the inner wall of the coupling groove, the first protruding part extends in the axial direction, the first recessed part extends in the axial direction, and the first protruding part and the first recessed part are alternately distributed on the inner wall of the coupling groove; the second coupling part 211 includes a coupling head, at least one second protruding part and at least one second recessed part are arranged on the outer wall of the coupling head, the second protruding part extends in the axial direction, the second recessed part extends in the axial direction, and the second protruding part and the second recessed part are alternately distributed on the outer wall of the coupling head; the coupling groove is sleeved with the coupling head, so that the first protruding part cooperates with the second recessed part, and the first recessed part cooperates with the second protruding part, thereby fixedly connecting the input shaft and the driving shaft, and limiting the relative rotation of the input shaft and the driving shaft around the shaft.

[0054] In some embodiments, one of the first coupling part 411 and the second coupling part 211 is an inner spline, and the other is an outer spline. The inner spline and the outer spline cooperate to limit the relative rotation of the input shaft 41 and the driving shaft 21 around the shaft. Figure 2 A schematic view of the first coupling part 411 being an inner spline and the second coupling part 211 being an outer spline.

[0055] As shown in the figure, Figure 3 The side of the shell 12 away from the front cover 11 is provided with a positioning hole seat 121, and an input through hole is arranged in the positioning hole seat 121; the motor housing 21 of the motor 2 is provided with a positioning boss 221 near one end of the speed reducer 1; the positioning boss 221 cooperates with the positioning hole seat 121 to form a stop positioning, thereby positioning and connecting the motor 2 and the speed reducer 1.

[0056] As shown in the figure, Figure 3 The driving system further includes a plurality of bolts 5, and the motor 2 and the speed reducer 1 are connected and fixed by the bolts 5.

[0057] As an implementation of the embodiment of the present disclosure, the driving system comprises four motors 2; the four motors 2 are arranged in an array on the side of the speed reducer 1 away from the front cover 11.

[0058] Figure 4 is a schematic diagram of a motor outgoing line in the embodiment of the present disclosure.

[0059] As shown in Figure 4 , the end of the motor casing 21 of the motor 2 away from the speed reducer 1 is provided with a junction box 22, and the stator outgoing line arranged inside the motor casing 21 is electrically connected with the high-voltage cable through the junction box 22.

[0060] In some embodiments, as shown in Figure 4 , the stator winding 61 is hot-fitted on the inner casing 212 of the motor casing 21, the stator outgoing line copper bar 62 is welded on the stator winding 61, the outgoing line screw 63 is welded with the stator outgoing line copper bar 62, the outgoing line screw 63 is fixed with the L-shaped junction terminal 64 through the bolt 65, and the L-shaped junction terminal 64 is welded with the high-voltage cable 66.

[0061] In some embodiments, the L-shaped junction terminal 64 can be replaced by a soft copper bar. The embodiment of the present disclosure does not make special limitation on this.

[0062] In the embodiment of the present disclosure, the junction box 22 is arranged at the end of the motor casing 21 away from the speed reducer 1, which realizes the axial outgoing line of the stator winding, is conducive to saving the space of the motor casing 21, reduces the radial dimension of the motor casing 21, enables the multiple motors 2 to be more compactly arranged on the side of the speed reducer 1, thereby saving the space of the driving system and being conducive to reducing the volume of the driving system. The more compact layout of the motor 2 is also conducive to selecting larger constituent components of the motor in the limited space, thereby realizing larger torque and rotational speed.

[0063] In the embodiment of the present disclosure, the motor casing 21 of the motor 2 comprises an inner casing and an outer casing, and the inner casing is sleeved in the outer casing; the cooling water channel is arranged between the inner casing and the outer casing, and the water inlet and the water outlet of the cooling water channel are both arranged at the end of the motor casing away from the speed reducer.

[0064] In the embodiment of the present disclosure, the water inlet and the water outlet of the cooling water channel are both arranged at the end of the motor casing away from the speed reducer, which is conducive to saving the space of the surface of the motor casing 21, thereby arranging the motor 2 more compactly on the side of the speed reducer 1.

[0065] In some embodiments, the water inlet and the water outlet are arranged on opposite sides at the end of the motor casing 21 away from the speed reducer 1.

[0066] In the embodiments of the present disclosure, the water inlet and the water outlet are arranged separately, which is beneficial to improve the space utilization rate of the end of the motor casing 21 away from the speed reducer 1.

[0067] In some embodiments, a plurality of circumferentially extending flow guide ribs are arranged on the outer surface of the inner casing; the flow guide ribs and the outer surface of the inner casing and the inner surface of the outer casing together form cooling water channels; the cooling water channels include cold water channels and hot water channels; the cold water channels are in communication with the water inlet at the end away from the speed reducer 1, and the hot water channels are in communication with the water outlet at the end away from the speed reducer 1; the cold water channels and the hot water channels are in communication at the end close to the speed reducer 1; and the cold water channels and the hot water channels are arranged alternately in the axial direction.

[0068] The cooling liquid enters the cooling water channels from the water inlet, flows along the cold water channels to the end close to the speed reducer 1, then enters the hot water channels at the end close to the speed reducer 1, flows along the hot water channels to the end away from the speed reducer 1, and flows out of the water outlet; the flow directions of the cooling liquid in the cold water channels and the hot water channels are opposite, and the temperature of the cooling liquid in the cold water channels is lower than that in the hot water channels, thereby forming a water channel structure in the form of counter-flow heat exchange. According to the counter-flow heat exchange principle, the cold water channels and the hot water channels are arranged alternately, the flow directions of the cooling liquid in the cold water channels and the hot water channels are opposite, and the temperature difference of the cooling liquid always exists and is large, thereby improving the cooling efficiency.

[0069] In the embodiments of the present disclosure, the inner surface of the outer casing is a conical surface, and in the axial direction, the height of the flow guide ribs increases along the direction in which the inner diameter of the inner surface of the outer casing increases. In some embodiments, the outer diameter surface of the flow guide ribs arranged on the outer surface of the inner casing is substantially a conical surface as a whole, and during assembly, the assembly can be completed by applying pressure to make the outer diameter surface of the flow guide ribs form an interference fit with the inner surface of the outer casing, without the need to heat the outer casing to a certain temperature to make it expand, then assemble the inner casing into the outer casing, or use friction stir welding to fix and seal the inner and outer casings, thereby greatly saving the assembly process cost, improving the production efficiency, and reducing the labor cost; the close contact between the outer diameter surface of the flow guide ribs and the inner surface of the outer casing can also reduce the risk of water leakage between adjacent cooling water channels.

[0070] In some embodiments, the outer diameter surface of the flow guide ribs is a conical surface, and the outer diameter surfaces of the plurality of flow guide ribs are on the same conical surface, which is matched with the conical surface of the inner surface of the outer casing in size and taper, and the inner surface of the outer casing and the outer diameter surface of the flow guide ribs form a conical surface structure with a draft angle, making the assembly of the inner casing and the outer casing easier. By setting the outer diameter surface of the flow guide ribs as a conical surface, the mating area of the outer diameter surface of the flow guide ribs and the inner surface of the outer casing is increased, which is beneficial to reduce the interference stress of the flow guide ribs and the outer casing and avoid material yield failure.

[0071] In the disclosed embodiment, the taper of the outer diameter of the guide rib ranges from 0° to 1°; the taper of the inner surface of the outer shell is consistent with the taper of the outer diameter of the guide rib, also ranging from 0° to 1°. In some embodiments, the taper of the outer diameter of the guide rib is 0.75°, and the taper of the inner surface of the outer shell is 0.75°.

[0072] In the disclosed embodiments, the taper of the outer diameter of the guide rib and the taper of the inner surface of the outer shell can be set based on the axial length of the motor housing. In some embodiments, the taper of the outer diameter of the guide rib is positively correlated with the axial length of the motor housing. For example, the longer the motor housing, the greater the taper of the outer diameter of the guide rib can be set.

[0073] In the disclosed embodiment, the inner housing comprises an inner cylindrical portion and an inner end cap disposed at one end of the inner cylindrical portion. The inner cylindrical portion and the inner end cap are integrally structured, and the guide ribs are disposed on the outer surface of the inner cylindrical portion. The outer housing comprises an outer cylindrical portion and an outer end cap disposed at one end of the outer cylindrical portion. The outer cylindrical portion and the outer end cap are integrally structured, and the inner surface of the outer cylindrical portion has a conical surface. After the inner and outer housings are assembled, the inner and outer end caps are located at opposite ends of the motor housing.

[0074] In the embodiment of the present disclosure, the inner shell is an integrated structure integrating the inner cylindrical portion and the inner end cover portion, and the outer shell is an integrated structure integrating the outer cylindrical portion and the outer end cover portion. During assembly, there is no need to use stir friction welding to fix and seal the inner and outer shells. The number of parts required for assembly is small, the assembly steps are small, and the reliability is higher. At the same time, the raw material cost and assembly cost of the motor casing can be reduced.

[0075] In the embodiment of the present disclosure, the drive system further includes a bracket arranged on the side of the multiple motors 2 away from the reducer 1, and the bracket is used to connect and fix the ends of the multiple motors 2 away from the reducer 1.

[0076] In the embodiment of the present disclosure, in order to achieve high torque and high speed, the length of the motor 2 is increased. A bracket is set on the side of the motor 2 away from the reducer 1 to connect and fix the ends of multiple motors 2 away from the reducer 1, which is conducive to reducing vibration.

[0077] Figure 5 It is a schematic diagram of a split bracket in an embodiment of the present disclosure.

[0078] like Figure 5 As shown, the bracket includes a central sub-bracket 71 and four edge sub-brackets 72; the central sub-bracket 71 is arranged in the center of the four motors 2, and is used to connect the four motors 2 at one end away from the reducer 1 to each other; the edge sub-bracket 72 is arranged between two motors 2, and the four edge sub-brackets 72 are used to connect the four motors 2 to each other in pairs.

[0079] Figures 6 to 10 is a schematic view of an integrated support in an embodiment of the present disclosure, wherein, Figure 6 is a schematic view of an integrated support 8 for mounting a drive system, Figure 7 is a schematic view of an integrated support 8 in perspective, Figure 8 is a front view of an integrated support 8, Figure 9 is a rear view of an integrated support 8, Figure 10 is a side view of an integrated support 8.

[0080] As shown in Figures 6 to 10 , the support comprises an integrated support 8, which is fixedly connected to the end of the motor 2 away from the speed reducer 1 and the side of the motor 2, respectively.

[0081] In an embodiment of the present disclosure, the integrated support 8 is locked to the end of the motor 2 away from the speed reducer 1 by a plurality of bolts, and the integrated support 8 is also fixedly connected to the side of the motor 2 by a plurality of bolts, which can meet the functional requirements of connecting multiple motors 2, providing a fixed point, a suspension mounting point, etc. After the integrated support 8 is installed, the inherent frequency of the drive system is increased by more than 30%, and the system mode is obviously improved.

[0082] In some embodiments, the integrated support 8 comprises a support body, the support body comprises a bottom 81 and a side wall 82 arranged on one side of the bottom 81, and the bottom 81 and the side wall 82 form a cavity; two intersecting first reinforcing ribs 83 are arranged in the cavity, and the first reinforcing ribs 83 divide the cavity into four sub-cavities, each of which corresponds to a motor; at least one second reinforcing rib 84 is arranged in the sub-cavity; a component through hole 85 is formed in the bottom 81 corresponding to the sub-cavity, for accommodating components on the end of the motor away from the speed reducer; the support body further comprises a protruding portion 86 arranged on the side opposite to the bottom 81 and the side wall 82; at least one of the bottom 81, the side wall 82, the first reinforcing rib 83 and the second reinforcing rib 84 is provided with a first bolt hole 87 for mounting a bolt connected to the end of the motor away from the speed reducer; the protruding portion 86 is provided with a second bolt hole 88 for mounting a bolt connected to the side of the motor.

[0083] Figure 11 is a schematic view of a layout of four motors 2 in an embodiment of the present disclosure.

[0084] In some embodiments, the four motors are all synchronous motors or all asynchronous motors. For example, as shown in Figure 11 , the motor 01, the motor 02, the motor 03 and the motor 04 are all synchronous motors or all asynchronous motors.

[0085] In some embodiments, the four motors 2 comprise two synchronous motors arranged along one diagonal line and two asynchronous motors arranged along another diagonal line. For example, as shown in Figure 11As shown, motor 01 and motor 03 are synchronous motors, and motor 02 and motor 04 are asynchronous motors; or, motor 01 and motor 03 are asynchronous motors, and motor 02 and motor 04 are synchronous motors.

[0086] In an embodiment of the present disclosure, the drive system further includes a control unit configured to control the operation of at least one motor. In some embodiments, the control unit can control the operation of at least one motor based on the vehicle's driving scenario to meet the vehicle's requirements for torque, speed, and the like.

[0087] The embodiments of the present disclosure do not impose any particular limitation on the control unit. In some embodiments, the control unit includes at least one motor control unit (MCU), each MCU being used to control at least one motor.

[0088] For example, in Figure 11 In the drive system of the motor layout shown, the control unit consists of two MCUs, one MCU is used to control motor 01 and motor 03, and the other MCU is used to control motor 02 and motor 04.

[0089] In a second aspect, an embodiment of the present disclosure provides a driving method for a drive system, wherein the drive system is the drive system described in the first aspect of the embodiment of the present disclosure; the driving method includes:

[0090] At least one motor of the drive system is controlled to operate, driving the input gear of the drive system to rotate, thereby driving the output gear and output shaft of the drive system to rotate.

[0091] In some embodiments, the drive system includes four motors; controlling at least one motor of the drive system to operate includes:

[0092] Controlling the two motors located at central symmetrical positions to operate simultaneously; or

[0093] The four motors are controlled to work simultaneously.

[0094] As Figure 11 Taking the four-motor layout shown as an example, Motor 01, Motor 02, Motor 03, and Motor 04 are all synchronous motors. When high torque is required for low-speed escape, Motor 01, Motor 02, Motor 03, and Motor 04 are controlled to operate simultaneously to output torque. When medium torque is required at low speeds on flat roads, Motor 01 and Motor 03 are controlled to operate to output torque, while Motor 02 and Motor 04 passively rotate. When low torque is required at high speeds, Motor 02 and Motor 04 are controlled to operate to output torque, while Motor 01 and Motor 03 passively rotate.

[0095] As Figure 11The four motor layouts shown are examples, motor 01 and motor 03 are synchronous motors, and motor 02 and motor 04 are asynchronous motors. When the low-speed stage needs to escape and needs large torque, control motor 01, motor 02, motor 03 and motor 04 to work simultaneously to output torque; when the low-speed stage needs medium torque on the flat road, control motor 01 and motor 03 to work to output torque, and motor 02 and motor 04 are passively dragged to rotate; when the high-speed stage needs small torque, control motor 02 and motor 04 to work to output torque, and motor 01 and motor 03 are passively dragged to rotate.

[0096] Example embodiments have been disclosed herein and, although the use of specific terms is exemplified throughout, they are used in this context only and should not be construed as limiting in any manner. In some instances, it will be apparent to those skilled in the art that features, aspects and / or elements described in connection with a particular embodiment can be used alone or in combination with other embodiments described herein, unless explicitly stated otherwise. Thus, it will be understood that various changes in form and details can be made without departing from the scope of the disclosure as set forth in the appended claims.

Claims

1. A drive system characterized by, The drive system comprises a reducer, a plurality of motors, a support, and a plurality of bolts. The reducer comprises a front cover and a shell, and the shell is provided with an output gear, a plurality of input gears meshing with the output gear, and the plurality of input gears are uniformly distributed along the circumference of the output gear. The front cover is provided with an output through hole, and the output shaft of the output gear extends to the outside of the front cover through the output through hole; the shell is provided with an input through hole, and the input shaft of the input gear extends to the outside of the shell through the input through hole; the axes of the output shaft and the input shaft are parallel. The plurality of input gears correspond to the plurality of motors one by one; the driving shaft of the motor is coupled with the input shaft for driving the input gear to rotate and drive the output gear to rotate. The support is arranged on the side of the plurality of motors away from the reducer for connecting and fixing the end of the plurality of motors away from the reducer.

2. The drive system of claim 1, wherein, The end of the input shaft close to the driving shaft is provided with a first coupling part, and the end of the driving shaft close to the input shaft is provided with a second coupling part; the first coupling part cooperates with the second coupling part to fixedly connect the input shaft and the driving shaft and limit the relative rotation of the input shaft and the driving shaft around the shaft.

3. The drive system of claim 2, wherein, The first coupling part comprises a coupling groove, and the inner wall of the coupling groove is provided with at least one first protruding part and at least one first recessed part; the first protruding part extends along the axial direction, and the first recessed part extends along the axial direction; the first protruding part and the first recessed part are alternately distributed on the inner wall of the coupling groove. The second coupling part comprises a coupling head, and the outer wall of the coupling head is provided with at least one second protruding part and at least one second recessed part; the second protruding part extends along the axial direction, and the second recessed part extends along the axial direction; the second protruding part and the second recessed part are alternately distributed on the outer wall of the coupling head. The coupling groove is sleeved with the coupling head, so that the first protruding part cooperates with the second recessed part, and the first recessed part cooperates with the second protruding part, thereby fixedly connecting the input shaft and the driving shaft and limiting the relative rotation of the input shaft and the driving shaft around the shaft.

4. The drive system of claim 2, wherein, The side of the shell away from the front cover is provided with a positioning hole seat, and the input through hole is arranged in the positioning hole seat; the motor shell of the motor is provided with a positioning boss close to the reducer; the positioning boss cooperates with the positioning hole seat to positionally connect the motor and the reducer.

5. The drive system of claim 4, wherein, The drive system further comprises a plurality of bolts, and the motor and the reducer are connected and fixed by the bolts.

6. The drive system of claim 1, wherein, The motor comprises a motor shell, and the motor shells of the plurality of motors are arranged on the side of the shell away from the front cover; the motor shells and the shell are integrated into an integral structure.

7. The drive system according to any one of claims 1 to 6, characterized by, The drive system comprises four motors; and the four motors are arrayed on the side of the reducer away from the front cover.

8. The drive system of claim 7, wherein, The motor shell of the motor is provided with a junction box at the end away from the reducer, and the stator outgoing line arranged in the motor shell is electrically connected with the high-voltage cable through the junction box.

9. The drive system of claim 7, wherein, The motor shell of the motor comprises an inner shell and an outer shell, the inner shell is sleeved in the outer shell, a cooling water channel is arranged between the inner shell and the outer shell, and the water inlet and the water outlet of the cooling water channel are arranged at the end of the motor shell away from the speed reducer.

10. The drive system of claim 9, wherein, The water inlet and the water outlet are arranged at opposite sides of the end of the motor shell away from the speed reducer.

11. The drive system of claim 7, wherein, The support comprises a central sub-support and four edge sub-supports; The central sub-support is arranged at the center of the four motors and is used for connecting the ends of the four motors away from the speed reducer to each other; The edge sub-supports are arranged between the two motors, and the four edge sub-supports are used for connecting the two motors to each other.

12. The drive system of claim 7, wherein, The support comprises an integrated support which is fixedly connected with the ends of the four motors away from the speed reducer and the sides of the motors.

13. The drive system of claim 12, wherein, The integrated support comprises a support main body which comprises a bottom and a side wall arranged at one side of the bottom, and the bottom and the side wall form a cavity; Two intersecting first reinforcing ribs are arranged in the cavity, the first reinforcing ribs divide the cavity into four sub-cavities, each of the sub-cavities corresponds to one of the motors, and at least one second reinforcing rib is arranged in the sub-cavity; Corresponding to the sub-cavities, a component through hole is formed in the bottom and is used for accommodating a component on the end of the motor away from the speed reducer; The support main body further comprises a protruding portion arranged at the side opposite to the bottom and the side wall; First bolt holes are arranged on at least one of the bottom, the side wall, the first reinforcing ribs and the second reinforcing ribs, and are used for mounting bolts connected with the ends of the motors away from the speed reducer; Second bolt holes are arranged on the protruding portion and are used for mounting bolts connected with the sides of the motors.

14. The drive system of claim 7, wherein, The four motors are synchronous motors or asynchronous motors.

15. The drive system of claim 7, wherein, The four motors comprise two synchronous motors arranged along one diagonal line and two asynchronous motors arranged along another diagonal line.

16. A drive method of a drive system, characterized by, The driving system is the driving system according to any one of claims 1 to 15, and the driving method comprises: Controlling at least one motor of the driving system to work, driving the input gear of the driving system to rotate, and driving the output gear and the output shaft of the driving system to rotate.

17. The driving method according to claim 16, wherein The driving system comprises four motors, and controlling at least one motor of the driving system to work comprises: Controlling two motors in the central symmetric position to work simultaneously; or Controlling the four motors to work simultaneously.

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