Drive system

Abstract

The utility model 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. 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, and in particular to a driving system. Background Art

[0002] With the popularization of new energy technologies, the requirements for performance such as torque of the drive system that provides power for new energy engineering machinery are becoming increasingly higher; in addition, the reliability of the drive system is also an important factor in evaluating the performance of new energy engineering machinery.

[0003] Some drive systems use a single motor + single-speed reducer architecture, which cannot provide high torque output. When applied to new energy mining trucks and other new energy engineering machinery, there are problems such as insufficient climbing ability and difficulty in getting out of trouble. Some drive systems use a single motor + multi-speed reducer architecture, which requires frequent gear shifting and has a high failure rate.

[0004] How to make the drive system provide large torque output while reducing the failure rate has become an urgent problem to be solved. Utility Model Content

[0005] An embodiment of the present disclosure provides a drive system.

[0006] In the first aspect, an embodiment of the present disclosure provides a driving system, including a reducer and multiple motors; the reducer includes a front cover and a shell, in which an output gear and multiple input gears meshing with the output gear are arranged, and the multiple input gears are evenly 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 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 multiple input gears correspond to the multiple motors one by one; the driving shaft of the motor is coupled to the input shaft, and is used to drive the input gear to rotate, thereby driving the output gear to rotate; the bracket is arranged on the side of the multiple motors away from the reducer, and is used to connect and fix one end of the multiple motors away from the reducer.

[0007] In some embodiments, a first coupling portion is provided at one end of the input shaft close to the drive shaft, and a second coupling portion is provided at one end of the drive shaft close to the input shaft; the first coupling portion cooperates with the second coupling portion to fix the input shaft and the drive shaft to limit the relative rotation of the input shaft and the drive shaft around the axis.

[0008] In some embodiments, the first coupling portion includes a coupling groove, at least one first protrusion and at least one first groove are provided on the inner wall of the coupling groove, the first protrusion extends in the axial direction, the first groove extends in the axial direction, and the first protrusion and the first groove are alternately distributed on the inner wall of the coupling groove; the second coupling portion includes a coupling head, at least one second protrusion and at least one second groove are provided on the outer wall of the coupling head, the second protrusion extends in the axial direction, the second groove extends in the axial direction, and the second protrusion and the second groove are alternately distributed on the outer wall of the coupling head; the coupling groove is sleeved with the coupling head, so that the first protrusion cooperates with the second groove, and the first groove cooperates with the second protrusion, so that the input shaft and the drive shaft are fixedly connected, and the input shaft and the drive shaft are restricted from rotating relative to each other around the axis.

[0009] In some embodiments, a positioning hole seat is provided on the side of the shell facing away from the front cover, and the input through hole is provided in the positioning hole seat; a positioning boss is provided on one end of the motor housing of the motor close to the reducer; the positioning boss cooperates with the positioning hole seat to position and connect the motor and the reducer.

[0010] In some embodiments, the drive system further includes a plurality of bolts, and the motor and the reducer are fixed by bolt connection.

[0011] In some embodiments, the driving system includes four of the motors; the four motor arrays are arranged on a side of the reducer facing away from the front cover.

[0012] In some embodiments, a junction box is provided at one end of the motor housing of the motor away from the reducer, and the stator output wires arranged inside the motor housing are electrically connected to the high-voltage cable through the junction box.

[0013] In some embodiments, the motor casing of the motor includes an inner casing and an outer casing, 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 outlet of the cooling water channel are both arranged at one end of the motor casing away from the reducer.

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

[0015] In some embodiments, the drive system further comprises a bracket disposed on a side of the plurality of motors away from the reducer, and the bracket is used to connect and fix one end of the plurality of motors away from the reducer.

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

[0017] In some embodiments, the bracket includes an integrated bracket, and the integrated bracket is respectively fixedly connected to one end of the four motors facing away from the reducer and the side of the motor.

[0018] In some embodiments, the integrated bracket includes a bracket body, the bracket body includes a bottom and a side wall arranged on one side of the bottom, the bottom and the side wall form a chamber; two intersecting first reinforcing ribs are arranged in the chamber, the first reinforcing ribs divide the chamber into four sub-chambers, each of the sub-chambers corresponds to one of the motors; at least one second reinforcing rib is arranged in the sub-chamber; corresponding to the sub-chamber, a component through hole is opened on the bottom for accommodating the components on the end of the motor away from the reducer; the bracket body also includes a protrusion arranged on the side of the bottom opposite to the side wall; a first bolt hole is arranged on at least one of the bottom, the side wall, the first reinforcing rib and the second reinforcing rib for installing a bolt connected to the end of the motor away from the reducer; a second bolt hole is arranged on the protrusion for installing a bolt connected to the side 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 include two synchronous motors arranged along one diagonal line and two asynchronous motors arranged along another diagonal line.

[0021] 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 comprises: controlling at least one motor of the drive system to operate, driving the input gear of the drive system to rotate, and driving the output gear and output shaft of the drive system to rotate.

[0022] In some embodiments, the drive system includes four motors; controlling at least one motor of the drive system to operate includes: controlling two motors in central symmetrical positions to operate simultaneously; or controlling four motors to operate simultaneously.

[0023] In the disclosed embodiment, the drive system includes a reducer and multiple motors. The reducer can convert the rotation of the multiple motor inputs into the rotation of the output shaft. In the reducer, the multiple input gears are evenly distributed, so that the radial force borne by the intermediate bearing in the reducer is smaller, which is beneficial to reducing vibration, realizing high torque and high speed output of the drive system, and improving the reliability of the drive system; it is also beneficial to select a smaller intermediate bearing, thereby saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0026] Figure 3 is a disassembled schematic diagram of a drive system in an embodiment of the present disclosure;

[0027] Figure 4 is a schematic diagram of an axial outlet in an embodiment of the present disclosure;

[0028] Figure 5 is a schematic diagram of a split bracket in an embodiment of the present disclosure;

[0029] Figure 6 is a schematic diagram of an integrated bracket in an embodiment of the present disclosure;

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

[0031] Figure 8 is a front view of an integrated bracket in an embodiment of the present disclosure;

[0032] Fig. 9 is a rear view of the integrated bracket in an embodiment of the present disclosure;

[0033] Fig.10 is a side view of an integrated bracket in an embodiment of the present disclosure;

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

[0035] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, the technical solution of the present disclosure is described in detail below with reference to the accompanying drawings.

[0036] Example embodiments will be described more fully below with reference to the accompanying drawings, but the example embodiments may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. On the contrary, the purpose of providing these embodiments is to make the present disclosure thorough and complete and to enable those skilled in the art to fully understand the scope of the present disclosure.

[0037] In the absence of conflict, the various embodiments of the present disclosure and the various features therein may be combined with each other.

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

[0039] The terms used herein are only used to describe specific embodiments and are not intended to limit the present disclosure. As used herein, the singular forms "a", "an" and "the" are also intended to include the plural forms, unless the context clearly indicates otherwise. It will also be understood that when the terms "comprising" and / or "made of" are used in this specification, the presence of the features, wholes, steps, operations, elements and / or components is specified, but the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups thereof is not excluded.

[0040] The embodiments described herein may be described with reference to plan views and / or cross-sectional views by means of idealized schematic diagrams of the present disclosure. Therefore, the example illustrations may be modified according to manufacturing techniques and / or tolerances. Therefore, the embodiments are not limited to the embodiments shown in the accompanying drawings, but include modifications of the configurations formed based on the manufacturing process. Therefore, the regions illustrated in the accompanying drawings have schematic properties, and the shapes of the regions shown in the figures illustrate the specific shapes of the regions of the elements, but are not intended to be limiting.

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

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

[0043] like Figure 1 and Figure 2As shown, the drive system includes a reducer 1 and multiple motors 2; the reducer 1 includes a front cover 11 and a housing 12, in which an output gear 3 and multiple input gears 4 are arranged, and the multiple input gears 4 are evenly distributed along the axial direction of the output gear 3 and mesh with the output gear 3 respectively. 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 output shaft 31 is parallel to the axis of the input shaft 41. The multiple input gears 4 correspond to the multiple motors 2 one by one, and the driving shaft 21 of the motor 2 is coupled to the input shaft 41. When the motor 2 is working, the driving shaft 21 rotates, driving the input shaft 41 and the input gear 4 to rotate, thereby driving the output gear 3 and the output gear 31 to rotate.

[0044] The embodiment of the present disclosure does not specifically limit the number of motors 2 in the drive system. The number of motors 2 in the drive system can be two, three, four, five, etc. For example, the drive system includes four motors 2, and the four motors are arranged at the four vertices of a rectangle.

[0045] In the disclosed embodiment, the drive system includes a reducer 1 and multiple motors 2. The reducer 1 can convert the rotation input by the multiple motors 2 into the rotation of the output shaft. In the reducer 1, the multiple input gears 4 are evenly distributed, so that the radial force borne by the intermediate bearing in the reducer 1 is smaller, which is beneficial to reducing vibration, realizing high torque and high speed output of the drive system, and improving the reliability of the drive system; it is also beneficial to select a smaller intermediate bearing, thereby saving costs.

[0046] In some embodiments, the reducer 1 and the motor 2 are independently detachable from each other, the housing 12 of the reducer 1 and the motor housing 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 a one-piece structure. For example, the motor housings of the multiple motors 2 are arranged on the side of the housing 12 of the reducer 1 away from the front cover 11, and the multiple motor housings are integrated with the housing 12 into an integrated structure.

[0048] The embodiments of the present disclosure do not impose any special limitation on this.

[0049] The disclosed embodiment does not specifically limit how the drive shaft 21 is coupled to the input shaft 41 .

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

[0051] like Figure 3As shown, a first coupling portion 411 is provided at one end of the input shaft 41 close to the drive shaft 21, and a second coupling portion 211 is provided at one end of the drive shaft 21 close to the input shaft 41; the first coupling portion 411 cooperates with the second coupling portion 211 to fix the input shaft 41 and the drive shaft 21 to limit the relative rotation of the input shaft 41 and the drive shaft 21 around the axis.

[0052] The embodiment of the present disclosure does not specifically limit the specific structures of the first coupling portion 411 and the second coupling portion 211. For example, one of the first coupling portion 411 and the second coupling portion 211 is an inner polygonal groove structure, and the other is an outer polygonal head structure, and the inner polygonal groove structure is sleeved on the outside of the outer polygonal head structure, and the two cooperate with each other to limit the relative rotation of the input shaft 41 and the drive shaft 21 around the axis. In the embodiment of the present disclosure, the inner polygonal groove structure and the outer polygonal head structure can be a triangle, a quadrilateral, a pentagon, etc., and the embodiment of the present disclosure does not specifically limit this.

[0053] In some embodiments, the first coupling portion 411 includes a coupling groove, and at least one first protrusion and at least one first groove portion are provided on the inner wall of the coupling groove, the first protrusion extends axially, the first groove portion extends axially, and the first protrusion and the first groove portion are alternately distributed on the inner wall of the coupling groove; the second coupling portion 211 includes a coupling head, and at least one second protrusion and at least one second groove portion are provided on the outer wall of the coupling head, the second protrusion extends axially, the second groove portion extends axially, and the second protrusion and the second groove portion are alternately distributed on the outer wall of the coupling head; the coupling groove is sleeved with the coupling head, so that the first protrusion cooperates with the second groove portion, and the first groove portion cooperates with the second protrusion portion, so as to fix the input shaft and the drive shaft and limit the relative rotation of the input shaft and the drive shaft around the axis.

[0054] In some embodiments, one of the first coupling portion 411 and the second coupling portion 211 is an internal spline, and the other is an external spline. The internal spline and the external spline cooperate to limit the relative rotation of the input shaft 41 and the drive shaft 21 around the axis. Figure 2 Schematic diagram showing that the first coupling portion 411 is an internal spline and the second coupling portion 211 is an external spline.

[0055] like Figure 3 As shown, a positioning hole seat 121 is provided on the side of the shell 12 facing away from the front cover 11, and the input through hole is provided in the positioning hole seat 121; a positioning boss 221 is provided on the end of the motor housing 21 of the motor 2 close to the reducer 1; the positioning boss 221 cooperates with the positioning hole seat 121 to form a stop positioning, so as to position and connect the motor 2 and the reducer 1.

[0056] like Figure 3 As shown, the drive system further includes a plurality of bolts 5 , and the motor 2 and the reducer 1 are connected and fixed by the bolts 5 .

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

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

[0059] like Figure 4 As shown, a junction box 22 is provided at one end of the motor housing 21 of the motor 2 away from the reducer 1 , and the stator outgoing wires arranged inside the motor housing 21 are electrically connected to the high-voltage cable through the junction box 22 .

[0060] In some embodiments, Figure 4 As shown, the stator winding 61 is heat-shrink-fitted onto the inner housing 212 of the motor housing 21 , the stator outlet copper bar 62 is welded onto the stator winding 61 , the outlet screw 63 is welded to the stator outlet copper bar 62 , the outlet screw 63 is fixed to the L-shaped terminal 64 by bolts 65 , and the L-shaped terminal 64 is welded to the high-voltage cable 66 .

[0061] In some embodiments, the L-shaped terminal 64 can be replaced by a soft copper busbar, which is not particularly limited in the present disclosure.

[0062] In the disclosed embodiment, the junction box 22 is arranged at the end of the motor housing 21 away from the reducer 1, so that the stator winding can be axially connected, which is conducive to saving space in the motor housing 21 and reducing the radial size of the motor housing 21, so that multiple motors 2 can be arranged more compactly on one side of the reducer 1, thereby saving space in the drive system and helping to reduce the volume of the drive system. The layout of the motor 2 is more compact, which is also conducive to selecting larger motor components in a limited space, thereby achieving greater torque and speed.

[0063] In the disclosed embodiment, the motor casing 21 of the motor 2 includes 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 outlet of the cooling water channel are both arranged at one end of the motor casing away from the reducer.

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

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

[0066] In the embodiment of the present disclosure, the water inlet and the water outlet are separately arranged, which is beneficial to improving the space utilization of the end of the motor housing 21 away from the reducer 1.

[0067] In some embodiments, a plurality of guide ribs extending in the circumferential direction are provided on the outer surface of the inner shell; the guide ribs and the outer surface of the inner shell and the inner surface of the outer shell together constitute a cooling water channel; the cooling water channel includes a cold water channel and a hot water channel; the cold water channel is connected to the water inlet at the end away from the reducer 1, and the hot water channel is connected to the water outlet at the end away from the reducer 1; the cold water channel and the hot water channel are connected at the end close to the reducer 1; the cold water channel and the hot water channel are arranged alternately in the axial direction.

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

[0069] In the disclosed embodiment, the inner surface of the outer shell is a conical surface, and in the axial direction, the height of the guide rib increases along the direction in which the inner diameter of the inner surface of the outer shell increases. In some embodiments, the outer diameter surface of the guide rib arranged on the outer surface of the inner shell is basically a conical surface as a whole. During assembly, the assembly can be completed by applying pressure to form an interference fit between the outer diameter surface of the guide rib and the inner surface of the outer shell. There is no need to heat the outer shell to a certain temperature to expand it and then assemble the inner shell into the outer shell, and there is no need to use stir friction welding to fix and seal the inner and outer shells, which greatly saves the assembly process cost, improves production efficiency, and reduces labor costs; the outer diameter surface of the guide rib is in close contact with the inner surface of the outer shell, which can also reduce the risk of water cross-talk between adjacent cooling water channels.

[0070] In some embodiments, the outer diameter surface of the guide rib is a conical surface, and the outer diameter surfaces of multiple guide ribs are on the same conical surface. The conical surface matches the conical surface of the inner surface of the outer shell in terms of size and taper. The inner surface of the outer shell and the outer diameter surface of the guide rib form a conical surface structure with a draft angle, making it easier to assemble the inner shell and the outer shell. Setting the outer diameter surface of the guide rib as a conical surface increases the matching area between the outer diameter surface of the guide rib and the inner surface of the outer shell, which is conducive to reducing the interference stress between the guide rib and the outer shell and avoiding material yield failure.

[0071] In the disclosed embodiment, the taper of the outer diameter surface of the guide rib is in the range of 0° to 1°; the taper of the inner surface of the outer shell is consistent with the taper of the outer diameter surface of the guide rib, and the taper is also in the range of 0° to 1°. In some embodiments, the taper of the outer diameter surface 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 embodiment, the taper of the outer diameter surface of the guide rib and the taper of the inner surface of the outer shell can be set according to the axial length of the motor housing. In some embodiments, the taper of the outer diameter surface of the guide rib is positively correlated with the axial length of the motor housing. For example, the longer the length of the motor housing, the larger the taper of the outer diameter surface of the guide rib can be set.

[0073] In the disclosed embodiment, the inner housing includes an inner cylindrical portion and an inner end cover portion disposed at one end of the inner cylindrical portion, the inner cylindrical portion and the inner end cover portion are an integral structure, and the flow guide ribs are disposed on the outer surface of the inner cylindrical portion. The outer housing includes an outer cylindrical portion and an outer end cover portion disposed at one end of the outer cylindrical portion, the outer cylindrical portion and the outer end cover portion are an integral structure, and the inner surface of the outer cylindrical portion is a conical surface. After the inner housing and the outer housing are assembled, the inner end cover portion and the outer end cover portion are respectively located at opposite ends of the motor housing.

[0074] In the disclosed embodiment, 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 number of assembly steps is 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 disclosed embodiment, the drive system further comprises a bracket arranged on a side of the plurality of motors 2 away from the reducer 1 , and the bracket is used to connect and fix one end of the plurality of motors 2 away from the reducer 1 .

[0076] In the disclosed embodiment, in order to achieve high torque and high speed, the length of the motor 2 is increased. A bracket is arranged on the side of the motor 2 away from the reducer 1, and the ends of multiple motors 2 away from the reducer 1 are connected and fixed, 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 interconnect the ends of the four motors 2 away from the reducer 1; 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 diagram of an integrated bracket in an embodiment of the present disclosure, wherein: Figure 6 is a schematic diagram of the drive system mounting integrated bracket 8, Figure 7 is a three-dimensional schematic diagram of the integrated bracket 8, Figure 8 The integrated front view of the bracket 8 is shown in FIG. Fig. 9 is a rear view of the integrated bracket 8, Fig.10 It is a side view of the integrated bracket 8.

[0080] like Figures 6 to 10 As shown, the bracket includes an integrated bracket 8 , which is fixedly connected to the ends of the four motors 2 facing away from the reducer 1 and the sides of the motors 2 .

[0081] In the disclosed embodiment, the integrated bracket 8 is locked with the end of the motor 2 away from the reducer 1 by multiple bolts, and the integrated bracket 8 is also connected and fixed with the side of the motor 2 by multiple bolts, which can meet the functional requirements of connecting multiple motors 2, providing fixing points, suspension installation points, etc. After installing the integrated bracket 8, the natural frequency of the whole drive system is increased by more than 30%, and the system mode is significantly improved.

[0082] In some embodiments, the integrated bracket 8 includes a bracket body, the bracket body includes a bottom 81 and a side wall 82 arranged on one side of the bottom 81, the bottom 81 and the side wall 82 form a chamber; two intersecting first reinforcing ribs 83 are arranged in the chamber, and the first reinforcing ribs 83 divide the chamber into four sub-chambers, each sub-chamber corresponding to a motor; at least one second reinforcing rib 84 is arranged in the sub-chamber; corresponding to the sub-chamber, a component through hole 85 is opened on the bottom 81 for accommodating the components on the end of the motor away from the reducer; the bracket body also includes a protrusion 86 arranged on the side opposite to the bottom 81 and the side wall 82; a first bolt hole 87 is arranged on at least one of the bottom 81, the side wall 82, the first reinforcing rib 83, and the second reinforcing rib 84 for installing a bolt connected to the end of the motor away from the reducer; a second bolt hole 88 is arranged on the protrusion 86 for installing a bolt connected to the side of the motor.

[0083] Fig.11 It is a schematic diagram of the 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. Fig.11 As shown, motor 01, motor 02, motor 03, and motor 04 are all synchronous motors, or are all asynchronous motors.

[0085] In some embodiments, the four motors 2 include two synchronous motors arranged along one diagonal line and two asynchronous motors arranged along another diagonal line. Fig.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 the disclosed embodiment, the drive system further includes a control unit, which is used to control the operation of at least one motor. In some embodiments, the control unit can control the operation of at least one motor according to the driving scenario of the vehicle to meet the vehicle's requirements for torque, speed, etc.

[0087] The embodiments of the present disclosure do not specifically limit the control unit. In some embodiments, the control unit includes at least one motor control unit (MCU), and each MCU is used to control at least one motor.

[0088] For example, in Fig.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 of a driving system, wherein the driving system is the driving system described in the first aspect of the embodiment of the present disclosure; the driving method comprises:

[0090] At least one motor of the drive system is controlled to work, so as to drive 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 work simultaneously; or

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

[0094] As Fig.11 Taking the four motor layouts shown as an example, motor 01, motor 02, motor 03, and motor 04 are all synchronous motors. When there is a large torque demand in the low-speed section, motor 01, motor 02, motor 03, and motor 04 are controlled to work and output torque at the same time; when there is a low-speed medium torque demand in the flat road section, motor 01 and motor 03 are controlled to work and output torque, and motor 02 and motor 04 are passively dragged to rotate; when there is a small torque demand in the high-speed section, motor 02 and motor 04 are controlled to work and output torque, and motor 01 and motor 03 are passively dragged to rotate.

[0095] As Fig.11Taking the four motor layout shown as an example, motor 01 and motor 03 are synchronous motors, and motor 02 and motor 04 are asynchronous motors. When there is a large torque demand in the low-speed section, motor 01, motor 02, motor 03, and motor 04 are controlled to work and output torque at the same time; when there is a low-speed medium torque demand in the flat road section, motor 01 and motor 03 are controlled to work and output torque, and motor 02 and motor 04 are passively dragged to rotate; when there is a small torque demand in the high-speed section, motor 02 and motor 04 are controlled to work and output torque, and motor 01 and motor 03 are passively dragged to rotate.

[0096] Example embodiments have been disclosed herein, and although specific terms are employed, they are used and should be interpreted only in a general illustrative sense and not for limiting purposes. In some instances, it will be apparent to those skilled in the art that, unless otherwise expressly noted, features, characteristics, and / or elements described in conjunction with a particular embodiment may be used alone or in combination with features, characteristics, and / or elements described in conjunction with other embodiments. Therefore, those skilled in the art will appreciate that various changes in form and detail may be made without departing from the scope of the present disclosure as set forth in the appended claims.

Claims

1. A drive system, characterized in that: Including reducer, multiple motors, and brackets; The reducer comprises a front cover and a housing, wherein an output gear and a plurality of input gears meshing with the output gear are arranged in the housing, and the plurality of input gears are evenly distributed along the circumference of the output gear; The front cover is provided with an output through hole, through which the output shaft of the output gear extends to the outside of the front cover; the housing is provided with an input through hole, through which the input shaft of the input gear extends to the outside of the housing; 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 to the input shaft to drive the input gear to rotate, thereby driving the output gear to rotate; The bracket is arranged on a side of the plurality of motors away from the reducer, and is used to connect and fix one end of the plurality of motors away from the reducer.

2. The drive system according to claim 1, characterized in that: A first coupling portion is provided at one end of the input shaft close to the drive shaft, and a second coupling portion is provided at one end of the drive shaft close to the input shaft; the first coupling portion cooperates with the second coupling portion to fix the input shaft and the drive shaft to limit the relative rotation of the input shaft and the drive shaft around the axis.

3. The drive system according to claim 2, characterized in that: The first coupling portion comprises a coupling groove, and at least one first protrusion and at least one first groove are arranged on the inner wall of the coupling groove, the first protrusion extends in the axial direction, the first groove extends in the axial direction, and the first protrusion and the first groove are alternately distributed on the inner wall of the coupling groove; The second coupling portion comprises a coupling head, and at least one second protrusion and at least one second groove are arranged on the outer wall of the coupling head, the second protrusion extends in the axial direction, the second groove extends in the axial direction, and the second protrusion and the second groove are alternately distributed on the outer wall of the coupling head; The coupling groove is sleeved with the coupling head, so that the first protrusion cooperates with the second groove and the first groove cooperates with the second protrusion, so as to fix the input shaft and the drive shaft and limit the relative rotation of the input shaft and the drive shaft around the axis.

4. The drive system according to claim 2, characterized in that: A positioning hole seat is provided on the side of the shell away from the front cover, and the input through hole is provided in the positioning hole seat; a positioning boss is provided on one end of the motor housing of the motor close to the reducer; the positioning boss cooperates with the positioning hole seat to position and connect the motor and the reducer.

5. The drive system according to claim 4, characterized in that: The driving system further comprises a plurality of bolts, and the motor and the reducer are fixedly connected by bolts.

6. The drive system according to claim 1, characterized in that: The motor comprises a motor casing, and the motor casings of the plurality of motors are arranged on a side of the casing away from the front cover, and the plurality of motor casings are integrated with the casing into an integral structure.

7. The drive system according to any one of claims 1 to 6, characterized in that: The driving system includes four motors; the four motor arrays are arranged on a side of the reducer away from the front cover.

8. The drive system according to claim 7, characterized in that: A junction box is arranged at one end of the motor housing of the motor away from the reducer, and the stator outgoing wires arranged inside the motor housing are electrically connected to the high-voltage cable through the junction box.

9. The drive system according to claim 7, characterized in that: The motor housing of the motor comprises an inner housing and an outer housing, wherein the inner housing is sleeved in the outer housing; a cooling water channel is arranged between the inner housing and the outer housing, and a water inlet and a water outlet of the cooling water channel are both arranged at one end of the motor housing away from the reducer.

10. The drive system according to claim 9, characterized in that: The water inlet and the water outlet are arranged on two opposite sides at one end of the motor housing away from the reducer.

11. The driving system according to claim 7, characterized in that: The support comprises a central sub-support and four edge sub-supports; The central sub-bracket is arranged in the center of the four motors and is used to connect the ends of the four motors away from the reducer to each other; The edge sub-bracket is arranged between two of the motors, and the four edge sub-brackets are used to connect the four motors to each other in pairs.

12. The drive system according to claim 7, characterized in that: The bracket includes an integrated bracket, and the integrated bracket is respectively fixedly connected to one end of the four motors away from the reducer and the side surface of the motor.

13. The drive system according to claim 12, characterized in that: The integrated bracket comprises a bracket body, the bracket body comprises a bottom and a side wall arranged on one side of the bottom, the bottom and the side wall forming a chamber; Two intersecting first reinforcing ribs are arranged in the chamber, and the first reinforcing ribs divide the chamber into four sub-chambers, each of which corresponds to one of the motors; at least one second reinforcing rib is arranged in the sub-chamber; Corresponding to the sub-chamber, a component through hole is opened on the bottom for accommodating the components on the end of the motor away from the reducer; The bracket body also includes a protrusion arranged on a side of the bottom opposite to the side wall; A first bolt hole is provided on at least one of the bottom, the side wall, the first reinforcing rib, and the second reinforcing rib for installing a bolt connected to an end of the motor away from the reducer; The protruding portion is provided with a second bolt hole for installing a bolt connected to the side surface of the motor.

14. The drive system according to claim 7, characterized in that: The four motors are all synchronous motors or all asynchronous motors.

15. The drive system according to claim 7, characterized in that: The four motors include two synchronous motors arranged along one diagonal line and two asynchronous motors arranged along another diagonal line.

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