Decoupling device for an electric drive system and method of use thereof, vehicle

Abstract

The application relates to the field of automobile technology, in particular to a decoupling device of an electric drive system, a use method of the decoupling device, and a vehicle. A first bearing is arranged at the journal of a gear, at least one one-way bearing is arranged between an input shaft and the gear, when the number of the one-way bearings is two, all the one-way bearings are arranged side by side, the outer ring of the one-way bearing is matched with the inner hole of the gear, and the inner ring is in close contact with the journal of the input shaft. A bearing cover is rotatably connected with the input shaft through a second bearing, and the bearing cover is fixedly connected with the gear through bolts. A third bearing is arranged on the outer side of the bearing cover. Thrust structures are arranged on the two sides of the journal of the input shaft, and the two thrust structures jointly play an axial positioning role. When the main motor works alone, the decoupling of the auxiliary motor can be realized, the auxiliary motor and its transmission device cannot be reversely dragged to participate in transmission, the drag loss and energy loss are reduced, and the transmission efficiency of the whole transmission system is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobiles, in particular to a decoupling device of an electric drive system, a method for using the same and a vehicle. BACKGROUND

[0002] Heavy commercial vehicles need to cope with heavy load, climbing, high-speed driving and other complex working conditions during operation, which puts high requirements on the performance of the power system. In the traditional power system design, single motor drive axle, due to its single power source, often has the following limitations when facing the above needs:

[0003] Contradiction between power shortage and performance optimization:

[0004] Traditional solution: In order to improve the power performance, manufacturers tend to use larger power motors and higher speed ratio reducers. However, this approach will result in a significant increase in the overall size and weight of the drive axle, which in turn increases the total mass of the vehicle, affecting fuel economy and overall operating costs.

[0005] Advantages of double-motor drive axle:

[0006] Power output and flexibility: Compared with single-motor drive axle, double-motor drive axle can provide greater power output through the coordinated work of two motors (main motor and auxiliary motor), and has more flexible power distribution capability. This design enables the vehicle to more efficiently utilize power resources when facing different working conditions.

[0007] Working condition adaptability: The design of double-motor drive axle allows the main motor to continuously provide power most of the time, while the auxiliary motor intervenes in the working condition that requires high torque (such as vehicle starting, heavy load climbing), and is disconnected during high-speed cruising, realizing the optimal configuration of power output.

[0008] Current technical problems:

[0009] Decoupling device missing: Most double-motor drive axles are not equipped with a dedicated decoupling device in the design, resulting in the participation of the auxiliary motor and its transmission mechanism in the transmission process when the main motor works alone. In this case, the auxiliary motor may be dragged in reverse, resulting in unnecessary energy loss and reducing the efficiency of the entire transmission system. The existence of this problem limits the potential of double-motor drive axle in energy saving and improving power performance.

[0010] Summary:

[0011] The power system design of heavy commercial vehicles is facing the challenge of balancing the maximization of power performance and the lightening of structure without sacrificing efficiency. Although the current solutions have made some progress, there are still technical bottlenecks to be broken through in the optimization of power distribution mechanism, especially in solving the decoupling problem between the main motor and the auxiliary motor. The discussion of these problems not only involves the innovation of hardware structure, but also touches the deep optimization of system control strategy and energy management, which is one of the key research directions for the development of heavy commercial vehicle power system in the future. SUMMARY

[0012] The purpose of the present application is to provide a decoupling device for an electric drive system, which can decouple the auxiliary motor when the main motor works alone, without dragging the auxiliary motor and its transmission device to participate in transmission, reducing drag loss and energy loss, and improving the transmission efficiency of the entire transmission system.

[0013] Another purpose of the present application is to provide a method for using a decoupling device for an electric drive system, which can decouple the auxiliary motor when the main motor works alone, without dragging the auxiliary motor and its transmission device to participate in transmission, reducing drag loss and energy loss, and improving the transmission efficiency of the entire transmission system.

[0014] Still another purpose of the present application is to provide a vehicle, which can decouple the auxiliary motor when the main motor works alone, without dragging the auxiliary motor and its transmission device to participate in transmission, reducing drag loss and energy loss, and improving the transmission efficiency of the entire transmission system.

[0015] The technical solution of the present application is as follows:

[0016] A decoupling device for an electric drive system, comprising an input shaft and a gear, the gear being loosely fitted on the input shaft, a first bearing being installed at the journal of the gear, at least one one-way bearing being installed between the input shaft and the gear, when the number of the one-way bearings is two, all the one-way bearings are arranged side by side, and the outer ring of the one-way bearing cooperates with the inner hole of the gear, and the inner ring is in close contact with the journal of the input shaft.

[0017] The bearing cover is rotatably connected with the input shaft through a second bearing, and the bearing cover is fixedly connected with the gear through bolts;

[0018] A third bearing is arranged on the outer side of the bearing cover;

[0019] A thrust structure is arranged on both sides of the journal of the input shaft, one side of the thrust structure is in close contact with the bearing cover, and the other side of the thrust structure is in close contact with the protruding side of the gear, and the two thrust structures jointly function as axial positioning.

[0020] Further, the first bearing and the third bearing are both conical roller bearings.

[0021] The second bearing is a needle bearing.

[0022] Further, the inner side of the bearing cover is provided with a groove, and a retainer ring is assembled in the groove for positioning the second bearing.

[0023] Further, the retainer ring is a flattened steel wire retainer ring.

[0024] Further, the thrust structure comprises fourth bearings, and the necks of the input shaft are respectively provided with the fourth bearings, one side of the fourth bearings is in close contact with the bearing cover, and the other side of the fourth bearings is in close contact with the extended side of the gear, and the two fourth bearings jointly function as a positioning structure.

[0025] Alternatively, the thrust structure comprises adjusting washers, and the necks of the input shaft are respectively provided with the adjusting washers, one side of the adjusting washers is in close contact with the bearing cover, and the other side of the adjusting washers is in close contact with the extended side of the gear, and the two adjusting washers jointly function as an axial positioning structure.

[0026] Further, the inner wall of the adjusting washer is provided with multiple notches for the passage of gear oil.

[0027] At least one side surface of the adjusting washer is provided with multiple oil grooves for the passage of gear oil.

[0028] Further, a housing and a housing cover are further included, the housing has a mounting port, the gear and the input shaft are mounted in the housing from the mounting port, and the mounting port is provided with the housing cover.

[0029] Further, the input shaft is provided with a first oil passage port, a second oil passage port and a third oil passage port, and the housing cover is provided with a fourth oil passage port, a fifth oil passage port, a sixth oil passage port and a seventh oil passage port.

[0030] The gear is provided with a first oil discharge hole, and the bearing cover is provided with a second oil discharge hole.

[0031] The use method of the decoupling device of the electric drive system comprises the following steps:

[0032] The decoupling device of the electric drive system is applied to a double-motor drive electric bridge, and the motor end of the double-motor drive electric bridge is connected and driven by a reduction mechanism and an input shaft, and the gear outputs power to the wheel end of the vehicle through a transmission device;

[0033] When the dual-motor driven vehicle is driven, the main motor is in a long meshing state, and when the main motor rotates forward, power is transmitted to the gear to drive the gear to rotate forward; wherein the one-way bearing has an engaged state and a disconnected state in the transmission process;

[0034] If the auxiliary motor works, the input shaft will rotate forward, and the speed of the input shaft is higher than that of the gear, at this time, the inner ring and the outer ring of the one-way bearing are in the engaged state, and the one-way bearing can transmit the power output by the auxiliary motor to the vehicle wheel end through the input shaft, the gear and the transmission device, for the large torque working condition of the vehicle; if the auxiliary motor does not work, the input shaft has no speed, at this time, the inner ring and the outer ring of the one-way bearing are in the disconnected state, and the power is interrupted to realize the decoupling of the auxiliary motor.

[0035] A vehicle comprises an electric drive system, the electric drive system comprises a dual-motor driven axle and the decoupling device of the electric drive system, and the decoupling device of the electric drive system is applied to the dual-motor driven axle.

[0036] Compared with the prior art, the beneficial effects of the present application are:

[0037] The decoupling device of the electric drive system is applied to the dual-motor driven axle, and the motor end of the dual-motor driven axle is connected to the input shaft for transmission, and the gear outputs power to the vehicle wheel end through the transmission device;

[0038] When the dual-motor driven vehicle is driven, the main motor is in a long meshing state, and when the main motor rotates forward, power is transmitted to the gear to drive the gear to rotate forward; wherein the one-way bearing has an engaged state and a disconnected state in the transmission process;

[0039] If the auxiliary motor works, the input shaft will rotate forward, and the speed of the input shaft is higher than that of the gear, at this time, the inner ring and the outer ring of the one-way bearing are in the engaged state, and the one-way bearing can transmit the power output by the auxiliary motor to the vehicle wheel end through the input shaft, the gear and the transmission device, for the large torque working condition of the vehicle; if the auxiliary motor does not work, the input shaft has no speed, at this time, the inner ring and the outer ring of the one-way bearing are in the disconnected state, and the power is interrupted to realize the decoupling of the auxiliary motor. Therefore, the decoupling device of the electric drive system provided by the present application can realize the decoupling of the auxiliary motor when the main motor works alone, and the auxiliary motor and its transmission device will not be involved in the transmission, thereby reducing the drag loss and energy loss and improving the transmission efficiency of the entire transmission system. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0041] Figure 1 A schematic diagram of the decoupling device of the present application (the shell and the shell cover are not shown);

[0042] Figure 2 A structural diagram of the adjusting gasket of the present application;

[0043] Figure 3 A schematic diagram of the decoupling device of the present application (the shell and the shell cover are shown);

[0044] Figure 4 A structural diagram of the shell cover of the present application;

[0045] Figure 5 A perspective view of the decoupling device of the present application;

[0046] Figure 6 Another perspective view of the decoupling device of the present application.

[0047] In the drawings:

[0048] 1 - gear; 100 - extended side; 101 - first oil drain hole;

[0049] 2 - bearing cover; 201 - second oil drain hole; 3 - toothed bolt with hexagonal flange surface; 4 - third bearing; 5 - first bearing; 6 - thrust structure; 601 - notch; 602 - oil groove;

[0050] 7 - input shaft; 701 - first oil passage opening; 702 - second oil passage opening; 703 - third oil passage opening;

[0051] 8 - one-way bearing; 9 - second bearing; 10 - hole pressed steel wire retainer; 11 - oil baffle; 12 - shell cover; 1201 - fourth oil passage opening; 1202 - fifth oil passage opening; 1203 - sixth oil passage opening; 1204 - seventh oil passage opening. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0053] The following detailed description of the embodiments of the application in the drawings is not intended to limit the scope of the application as claimed, but merely represents selected embodiments of the application. Based upon the embodiments of the application, all other embodiments that would be obvious to one of ordinary skill in the art and that are within the scope of the application belong to the scope of the application.

[0054] It should be noted that similar reference numbers and letters refer to similar items in the following drawings, and therefore, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.

[0055] In the description of the application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the application is usually placed, and are merely for the convenience of describing the application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application. In addition, the terms "first", "second", "third", and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0056] In addition, the terms "horizontal", "vertical", and the like do not mean that the components must be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that it is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0057] In the description of the application, it should also be noted that unless otherwise explicitly specified and limited, the terms "provided", "mounted", "connected", "linked" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication between two elements inside. For those of ordinary skill in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0058] Some embodiments of the application will be described in detail below with reference to the accompanying drawings. The following embodiments and features in the embodiments can be combined with each other without conflict.

[0059] Embodiment 1

[0060] With reference to Figures 1-6 The embodiment provides a decoupling device of an electric drive system, comprising an input shaft 7 and a gear 1, the gear 1 is sleeved on the input shaft 7, which is mainly applied to a double-motor electric drive system.

[0061] With reference to Figure 1 , the axle journal of the gear 1 is provided with a first bearing 5, which is a tapered roller bearing, at least one one-way bearing 8 is arranged between the input shaft 7 and the gear 1, and the outer ring of the one-way bearing 8 is matched with the inner hole of the gear 1, and the inner ring is in close contact with the axle journal of the input shaft 7; preferably, the number of the one-way bearings 8 in the embodiment is designed to be two and arranged side by side, which can transmit greater torque;

[0062] The bearing cover 2 passes through the input shaft 7 and is rotationally connected with the input shaft 7 through a second bearing 9, the bearing cover 2 is located at the side of the gear 1, and the bearing cover 2 is fixedly connected with the gear 1 through a plurality of bolts;

[0063] The outer side of the bearing cover 2 is provided with a third bearing 4, which is also a tapered roller bearing and is used in pairs with the first bearing 5; the second bearing 9 can be a needle bearing;

[0064] The axle journals of the input shaft 7 are respectively provided with thrust structures 6, one side of the thrust structure 6 is in close contact with the bearing cover 2, and the other side of the thrust structure 6 is in close contact with the protruding side 100 of the gear 1, and the two thrust structures 6 jointly function as positioning.

[0065] Specifically, the bearing cover 2 is assembled on the input shaft 7 through the second bearing 9 (needle bearing) and connected with the other side of the gear 1 by using a plurality of bolts, preferably, the bolts can be hexagonal flange face toothed bolts 3 (as shown in Figure 1 and Figure 6 ). The inner side of the bearing cover 2 is provided with an axle shoulder and a recess, wherein the recess is used for assembling a retainer, and the retainer is a hole pressed steel wire retainer 10, so as to realize accurate positioning of the needle bearing. The needle bearing can make the bearing cover 2 stably operate on the input shaft 7, reduce friction and wear, and ensure normal operation of the system.

[0066] The outer side of the bearing cover 2 is provided with a third bearing 4 (tapered roller bearing) and used in pairs with the first bearing 5 (tapered roller bearing) to improve the carrying capacity and system accuracy.

[0067] The thrust structure 6 includes a fourth bearing or an adjusting washer, specifically, the thrust structure 6 has the following designs:

[0068] The first kind: the thrust structure 6 only includes a fourth bearing, the axle journals of the input shaft 7 are respectively provided with the fourth bearing, the fourth bearing is a thrust bearing, the left side of the thrust bearing is in close contact with the bearing cover 2, and the right side of the thrust bearing is in close contact with the protruding side 100 of the gear 1, and the two jointly function as positioning. The thrust bearing can bear the bearing load and can realize relative rotation in the axial direction, reducing friction and wear;

[0069] The second kind: the thrust structure 6 only includes adjusting washers, and the shaft necks of the input shaft 7 are respectively provided with adjusting washers, one of which is in close contact with the bearing cover 2, and the other of which is in close contact with the protruding side 100 of the gear 1, and the two adjusting washers jointly play a positioning role.

[0070] The input shaft 7 is internally provided with an oil baffle 11 on one side of the shaft head, so as to ensure reliable lubrication of the bearing and the gear 1.

[0071] When the thrust structure 6 adopts the second kind, the shaft necks of the input shaft 7 are respectively provided with adjusting washers, the adjusting washer on the left side is in close contact with the bearing cover 2, and the adjusting washer on the right side is in close contact with the protruding side 100 of the gear 1, and the two adjusting washers jointly play a positioning role. The structure of the adjusting washer is shown in Figure 2 The adjusting washer is in the shape of a sheet as a whole, the outer periphery (i.e. the outer ring or outer wall) of the adjusting washer is circular, the inner ring or inner wall of the adjusting washer is provided with multiple notches 601 so that the inner periphery is irregularly shaped (the shapes of the multiple notches 601 can be different), and the notches 601 provided on the inner periphery form inner ring oil channel openings for the passage of gear oil, and at least one of the two side surfaces of the adjusting washer is provided with multiple oil grooves 602, so as to facilitate the entry and exit of gear oil, and the oil grooves 602 form planar oil channel openings, so as to realize reliable lubrication of the bearing, and have the advantages of simple structure and low cost. Preferably, the two side surfaces of the adjusting washer are respectively provided with multiple oil grooves 602, as shown in Figure 2 .

[0072] The input shaft 7 is provided with a first oil channel opening 701, a second oil channel opening 702 and a third oil channel opening 703, as shown in Figure 3 .

[0073] The decoupling device further includes a shell and a shell cover 12, the shell has a mounting opening, the gear 1 and the input shaft 7 and other related components are mounted in the shell from the mounting opening, the mounting opening is provided with the shell cover 12, and the shell cover 12 is connected with the shell through bolts, and the structure is shown in Figure 3 and Figure 4 The shell cover 12 includes a fourth oil channel opening 1201, a fifth oil channel opening 1202, a sixth oil channel opening 1203 and a seventh oil channel opening 1204.

[0074] The entire decoupling device is shown in Figure 5 and Figure 6As shown, the gear 1 is provided with a first oil drain hole 101, and the bearing cover 2 is provided with a second oil drain hole 201. When the gear 1 rotates at high speed, the gear oil in the housing splashes, enters the fifth oil channel opening 1202 through the fourth oil channel opening 1201, and part of the gear oil entering the fifth oil channel opening 1202 enters the sixth oil channel opening 1203, and the other part enters the seventh oil channel opening 1204. The gear oil entering the seventh oil channel opening 1204 is used to lubricate the third bearing 4; the gear oil entering the sixth oil channel opening 1203 will flow into the inner cavity of the input shaft 7, and will be thrown out from the third oil channel opening 703, the second oil channel opening 702 and the first oil channel opening 701 respectively under the action of centrifugal force, the gear oil thrown out through the third oil channel opening 703 lubricates the second bearing 9 and the thrust structure 6, the gear oil thrown out through the second oil channel opening 702 lubricates the one-way bearing 8, and the gear oil thrown out through the first oil channel opening 701 lubricates the right side ball bearing. When the gear oil at the one-way bearing 8 accumulates to the full, the excess gear oil will flow out from the first oil drain hole 101 and the second oil drain hole 201, the gear oil flowing out from the first oil drain hole 101 can lubricate the third bearing 4, and the gear oil flowing out from the second oil drain hole 201 can lubricate the first bearing 5. The upper part of the fourth oil channel opening 1201 is provided with an extended end flush with the cover edge of the housing cover 12, which can converge the splashed gear oil to the fourth oil channel opening 1201 under the action of centrifugal force, and ensure the lubrication effect. Adjusting the depth of the sixth oil channel opening 1203 can control the amount of gear oil entering the inner cavity of the input shaft 7 through the sixth oil channel opening 1203, and facilitate precise control of lubrication. Adjusting the flat oil channel opening provided on the gasket can store a small amount of gear oil to avoid dry grinding, and adjusting the inner ring oil channel opening of the gasket can accelerate the passage of gear oil and enhance the lubrication effect, solving the problem of serious heating of the one-way bearing 8 under high speed.

[0075] The common one-way bearing 8 mainly has a roller type one-way bearing and a wedge block type one-way bearing. Taking the roller type one-way bearing as an example, it mainly includes an outer ring, an inner ring with a slope, rollers and springs. The motor end is connected to the input shaft 7 through or without a reduction mechanism for transmission, and the gear 1 outputs power to the wheel end of the vehicle through other transmission devices. When the main motor is in a long meshing state, the power is transmitted to the gear 1 through or without a multi-stage reduction mechanism, driving the gear 1 to rotate in the same direction as the vehicle. The one-way bearing 8 has an engaged state and a disconnected state during transmission. If the auxiliary motor works, it drives the input shaft 7 to rotate in the same direction, and the rotating speed of the input shaft 7 is higher than that of the gear 1. At this time, the inner ring of the one-way bearing 8 can be regarded as a driving part (the outer ring can be regarded as a driven part), the rollers move in the wedge-shaped space, and then the rollers are squeezed to one side of the narrow space, so that the inner and outer rings are wedged together to rotate. The one-way bearing 8 is in the engaged state, the power is transmitted from the driving part to the driven part, and then the one-way bearing 8 can transmit the power output by the auxiliary motor to the wheel end of the vehicle through the input shaft 7, the gear 1 and the transmission device, which is used for vehicle starting, heavy load climbing and other conditions requiring large torque. If the auxiliary motor does not work, the rotating speed of the input shaft 7 is zero, the outer ring can be regarded as a driving part (the inner ring can be regarded as a driven part), the rollers roll to the wide side of the wedge-shaped space, the rollers cannot wedge the inner and outer rings, and the inner and outer rings slide relative to each other. The driven part is separated from the driving part, the power is interrupted, and decoupling is realized. When the main motor works alone after decoupling, the auxiliary motor does not work together, so that power loss is not generated, which helps to improve the transmission efficiency and is used for high-speed cruising conditions. The reduction mechanism between the input shaft 7 and the auxiliary motor does not rotate, which reduces the oil stirring loss, reduces the drag loss and energy loss, and helps to improve the transmission efficiency.

[0076] Example 2

[0077] The embodiment provides a use method of the decoupling device of the electric drive system, which comprises the following steps:

[0078] The decoupling device of the electric drive system is applied to a double-motor drive axle, and the motor end of the double-motor drive axle is connected to the input shaft 7 through a reduction mechanism for transmission, and the gear 1 outputs power to the wheel end of the vehicle through a transmission device. It should be noted that the double-motor drive axle is an important part of a vehicle drive system, which is usually designed to be used in automobiles, especially electric vehicles. The core feature of this drive axle is that it is equipped with two electric motors (which may also be electric motors) inside, which are a main motor and an auxiliary motor.

[0079] When the dual-motor driven vehicle is driven, the main motor is generally in a long meshing state, and when the main motor rotates forward, power is transmitted to gear 1 through a multi-stage reduction mechanism, driving gear 1 to rotate forward; wherein the one-way bearing 8 has an engaged state and a disconnected state in the transmission process;

[0080] If the auxiliary motor works, it will drive the input shaft 7 to rotate forward, and the speed of the input shaft 7 is higher than that of the gear 1, at this time, the inner ring and the outer ring of the one-way bearing 8 are in the engaged state, and the one-way bearing 8 can transmit the power output by the auxiliary motor to the wheel end through the input shaft 7, gear 1 and the transmission device, for the large torque working condition of the vehicle; if the auxiliary motor does not work, the input shaft 7 has no speed, at this time, the inner ring and the outer ring of the one-way bearing 8 are in the disconnected state, and the power is interrupted to realize the decoupling of the auxiliary motor.

[0081] Embodiment 3

[0082] A vehicle comprising an electric drive system, the electric drive system comprising a dual-motor drive axle and the decoupling device of the electric drive system, the decoupling device of the electric drive system is applied to the dual-motor drive axle, when the dual-motor driven vehicle is driven, the main motor is generally in a long meshing state, and when the main motor rotates forward, power is transmitted to gear 1 through or without a multi-stage reduction mechanism, driving gear 1 to rotate forward; wherein the one-way bearing 8 has an engaged state and a disconnected state in the transmission process;

[0083] If the auxiliary motor works, it will drive the input shaft 7 to rotate forward, and the speed of the input shaft 7 is higher than that of the gear 1, at this time, the inner ring and the outer ring of the one-way bearing 8 are in the engaged state, and the one-way bearing 8 can transmit the power output by the auxiliary motor to the wheel end through the input shaft 7, gear 1 and the transmission device, for the large torque working condition of the vehicle; if the auxiliary motor does not work, the input shaft 7 has no speed, at this time, the inner ring and the outer ring of the one-way bearing 8 are in the disconnected state, and the power is interrupted to realize the decoupling of the auxiliary motor.

[0084] The technical scheme of the present application has the following advantages:

[0085] 1. A decoupling method and a vehicle are provided, when the dual-motor driven vehicle is driven, the main motor always works. When the auxiliary motor works normally, the power output by the auxiliary motor is transmitted to the wheel end through the input shaft 7, gear 1 and other mechanisms, for the large torque working condition of the vehicle such as starting and heavy load climbing; when the auxiliary motor does not work, the power output by the main motor will not be transmitted to the gear 1, realizing decoupling. After decoupling, the main motor works alone without dragging the auxiliary motor to work, thereby improving the service life of the auxiliary motor and improving the transmission efficiency for high-speed cruising working condition;

[0086] 2. Gear 1 is sleeved on input shaft 7 through one-way bearing 8, one-way bearing 8 has two states of engagement and disconnection, the engagement and disconnection of input shaft 7 and gear 1 are realized by changing the state of one-way bearing 8, thereby realizing decoupling;

[0087] 3、Input shaft 7 is connected with motor end through reduction mechanism or without reduction mechanism, in some working conditions, input shaft 7 is connected with motor end through reduction mechanism, which can avoid unidirectional bearing 8 working in high speed difference working condition, and reduce heating and failure possibility;

[0088] 4、Two unidirectional bearings 8 are arranged side by side, which can transmit greater torque;

[0089] 5、Thrust structure 6 on both sides of gear 1 is optional (thrust bearing or adjusting gasket), selecting thrust bearing can reduce friction and wear, and selecting adjusting gasket can reduce cost;

[0090] 6、The position of tapered roller bearing can be changed according to arrangement situation, which is convenient for saving axial space;

[0091] 7、Input shaft 7, gear 1 and shell cover 12 are respectively provided with multiple oil inlet and outlet holes, which are used for lubricating different bearings, and solve the problem of serious heating of the entire decoupling device in high speed state;

[0092] 8、The whole structure design of shell cover 12: provided with fourth oil channel opening 1201, fifth oil channel opening 1202, sixth oil channel opening 1203 and seventh oil channel opening 1204, which can collect the splashed gear oil together, and divide the gear oil into two paths to lubricate each bearing respectively;

[0093] 9、The upper part of fourth oil channel opening 1201 of shell cover 12 is provided with an extended end flush with the edge of cover body, which can gather the splashed gear oil to fourth oil channel opening 1201 under the action of centrifugal force, and ensure the lubrication effect;

[0094] 10、The depth of sixth oil channel opening 1203 can be changed according to design requirements, adjusting the depth of sixth oil channel opening 1203 can control the amount of gear oil entering the inner cavity of input shaft 7 through sixth oil channel opening 1203, which is convenient for realizing precise control of lubrication;

[0095] 11、The whole structure design of adjusting gasket: the whole is thin sheet shape, the inner ring is irregular shape due to multiple notches 601 for gear oil to pass through, and the two side surfaces of adjusting gasket are provided with multiple oil grooves 602, which is convenient for gear oil to enter and exit, and realizes reliable lubrication of bearing;

[0096] 12、The inner part of one side shaft head of input shaft 7 is provided with oil baffle 11, which ensures reliable lubrication of bearing and gear 1.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

[0098] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A decoupling device of an electric drive system comprising an input shaft (7) and a gear, the gear (1) being loose on the input shaft (7), characterized in that, The first bearing (5) is arranged at the journal of the gear (1), at least one one-way bearing (8) is arranged between the input shaft (7) and the gear (1), when the number of the one-way bearings (8) is two, all the one-way bearings (8) are arranged side by side, the outer ring of the one-way bearing (8) is matched with the inner hole of the gear (1), and the inner ring is in close contact with the journal of the input shaft (7); The bearing cover (2) is rotatably connected with the input shaft (7) through the second bearing (9), and the bearing cover (2) is fixedly connected with the gear (1) through bolts; The third bearing (4) is arranged on the outer side of the bearing cover (2); The thrust structure (6) is arranged on both sides of the journal of the input shaft (7), one side of the thrust structure (6) is in close contact with the bearing cover (2), the other side of the thrust structure (6) is in close contact with the protruding side (100) of the gear (1), and the two thrust structures (6) jointly serve as axial positioning.

2. The decoupling device of an electric drive system according to claim 1, characterized in that The first bearing (5) and the third bearing (4) are both conical roller bearings; The second bearing (9) is a needle bearing.

3. The decoupling device of an electric drive system according to claim 1, characterized in that The inner side of the bearing cover (2) is provided with a groove, and a retainer ring is arranged in the groove and used for positioning the second bearing (9).

4. The decoupling device of an electric drive system according to claim 3, characterized in that The retainer ring is a hole pressing steel wire retainer ring (10).

5. The decoupling device of an electric drive system according to claim 1, characterized in that The thrust structure (6) includes a fourth bearing, and the fourth bearing is arranged on both sides of the journal of the input shaft (7), one side of the fourth bearing is in close contact with the bearing cover (2), the other side of the fourth bearing is in close contact with the protruding side (100) of the gear (1), and the two fourth bearings jointly serve as positioning; Alternatively, the thrust structure (6) includes an adjusting washer, and the adjusting washer is arranged on both sides of the journal of the input shaft (7), one side of the adjusting washer is in close contact with the bearing cover (2), the other side of the adjusting washer is in close contact with the protruding side (100) of the gear (1), and the two adjusting washers jointly serve as axial positioning.

6. The decoupling device of an electric drive system according to claim 5, characterized in that The inner wall of the adjusting washer is provided with a plurality of notches (601) for the passage of gear oil; At least one side surface of the adjusting washer is provided with a plurality of oil grooves (602) for the passage of gear oil.

7. The decoupling device of an electric drive system according to claim 1, characterized in that Further comprising a shell and a shell cover (12), the shell has a mounting port, the gear (1) and the input shaft (7) are mounted in the shell from the mounting port, and the mounting port is provided with the shell cover (12).

8. The decoupling device of an electric drive system according to claim 7, characterized in that The input shaft (7) is provided with a first oil channel port (701), a second oil channel port (702) and a third oil channel port (703), and the shell cover (12) is provided with a fourth oil channel port (1201), a fifth oil channel port (1202), a sixth oil channel port (1203) and a seventh oil channel port (1204); The gear (1) is provided with a first oil drain hole (101), and the bearing cover (2) is provided with a second oil drain hole (201).

9. Use of a decoupling device of an electric drive system according to any one of claims 1 to 8, characterized in that The method comprises the following steps: The decoupling device of the electric drive system is applied to a double-motor drive axle, and a motor end of the double-motor drive axle is connected to a transmission of an input shaft (7), and a gear (1) outputs power to a wheel end of a vehicle through a transmission device; When the double-motor drive vehicle is in operation, the main motor is in a long meshing state, and when the main motor rotates forward, power is transmitted to the gear (1) through a multi-stage reduction mechanism, and the gear (1) rotates forward; wherein the one-way bearing (8) has an engaged state and a disconnected state in the transmission process; If the auxiliary motor is working, the input shaft (7) will rotate forward, and the speed of the input shaft (7) is higher than that of the gear (1), at this time, the inner ring and the outer ring of the one-way bearing (8) are in the engaged state, and the one-way bearing (8) can transmit the power output by the auxiliary motor to the wheel end of the vehicle through the input shaft (7), the gear (1) and the transmission device, for the large torque working condition of the vehicle; if the auxiliary motor is not working, the input shaft (7) has no speed, at this time, the inner ring and the outer ring of the one-way bearing (8) are in the disconnected state, and the power is interrupted to realize the decoupling of the auxiliary motor.

10. A vehicle comprising an electric drive system, characterized in that The electric drive system comprises a double-motor drive axle and the decoupling device of the electric drive system according to any one of claims 1-8, and the decoupling device of the electric drive system is applied to the double-motor drive axle.

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