Powertrain and electric vehicle

Abstract

The application provides a power assembly and an electric vehicle. A reducer end cover of the power assembly is used for fixing a bearing outer ring of an input shaft of a reducer. One end of the input shaft, which is away from the reducer end cover, is used for coupling a motor shaft of a driving motor. An inner cavity of the input shaft is used for fixing and accommodating one end of an oil guide pipe. The oil guide pipe is used for conveying oil output by the reducer end cover to the motor shaft. The other end of the oil guide pipe extends out of the inner cavity of the input shaft. The other end of the oil guide pipe is used for fixing a rotor of a rotary transformer. A stator of the rotary transformer is fixed to the reducer end cover. The oil guide pipe is used for realizing the functions of guiding oil to the motor shaft and supporting the rotary transformer. The length of the input shaft or the length of the motor shaft does not need to be additionally increased. An additional structural member for fixing the rotary transformer is not needed. The axial dimension of the power assembly is reduced, and the process design of the power assembly is simplified.

Description

Technical Field

[0001] This application relates to the field of electric vehicle technology, and in particular to a powertrain and an electric vehicle. Background Technology

[0002] In the powertrain, the resolver serves as a position sensor to detect the rotational position and speed of the drive motor rotor, making it an indispensable key component. Traditional resolver rotor arrangements typically involve directly mounting the resolver rotor to one end of the drive shaft or fixing it to the drive shaft via an additional structure. This occupies a significant amount of axial space, increasing the overall size of the powertrain and making it difficult to meet the demands for compact and lightweight design. Utility Model Content

[0003] This application provides a powertrain and electric vehicle that uses a reused oil guide pipe to fix the rotor of a rotary transformer, thereby reducing the axial dimension of the powertrain occupied by the rotary transformer and simplifying the powertrain process design.

[0004] In a first aspect, this application provides a powertrain in which a reducer end cover is used to fix the bearing outer ring of the input shaft of the reducer, one end of the input shaft away from the reducer end cover is used to couple the motor shaft of the drive motor, the inner cavity of the input shaft is used to fix and accommodate one end of an oil guide pipe, the oil guide pipe is used to transport oil output from the reducer end cover to the motor shaft, wherein the other end of the oil guide pipe extends out of the inner cavity of the input shaft, the other end of the oil guide pipe is used to fix the rotor of a rotary transformer, and the stator of the rotary transformer is fixed to the reducer end cover.

[0005] In this embodiment, the rotor of the rotary transformer is positioned at one end of the oil guide pipe within the input shaft cavity. The oil guide pipe serves to both supply oil from the reducer end cover to the motor shaft and support and fix the rotor of the rotary transformer. This eliminates the need to increase the length of the input shaft and the motor shaft, reducing the axial dimensions of the powertrain and simplifying the powertrain process design by eliminating the need for additional structural components to fix the rotor. Furthermore, since the motor shaft needs to fix multiple components such as the drive motor rotor, bearings, and grounding springs, fixing the rotary transformer rotor to the motor shaft would increase the number of mounting components, complicating the installation process and lengthening the motor shaft. Extending the motor shaft requires redesigning its dimensions and rebalancing the rotor. In contrast, fixing the rotary transformer rotor to the oil guide pipe simplifies the process and allows for more flexible installation, without considering the influence of other components such as the rotor and bearings fixed to the motor shaft.

[0006] In one embodiment, the other end of the oil guide tube includes a first section and a second section, the second section being arranged between the first section and one end of the oil guide tube. The first section is used to fix the rotor of the rotary transformer, the outer diameter of the second section is larger than the outer diameter of the first section, and the second section is used to abut against the rotor of the rotary transformer along the axial direction of the input shaft.

[0007] In this embodiment, the outer diameter of the first segment used to fix the rotor of the rotary transformer is smaller than the outer diameter of the second segment, so that the second segment abuts against the rotor of the rotary transformer along the axial direction of the input shaft. This allows the rotor of the rotary transformer to be confined to the oil guide pipe along the axial direction of the input shaft, preventing the rotor of the rotary transformer and the oil guide pipe from moving relative to each other along the axial direction of the input shaft, thereby improving the detection accuracy and stability of the rotary transformer.

[0008] In one embodiment, the outer diameter of the second segment is larger than the inner diameter of the input shaft, and the axial end face of the second segment facing away from the first segment is used to abut against the axial end face of the input shaft along the axial direction of the input shaft.

[0009] In this embodiment, the outer diameter of the second segment is larger than the inner diameter of the input shaft, which facilitates the formation of a larger inner diameter flow channel within the oil guide pipe, increasing the amount of oil delivered by the oil guide pipe to the motor shaft. Furthermore, the larger outer diameter of the second segment allows the axial end face of the second segment away from the first segment to abut against the axial end face of the input shaft along its axis, thus fixing the oil guide pipe and the input shaft relatively along their axial direction. This, in turn, fixes the rotor of the rotary transformer, which is fixed by the oil guide pipe, relatively along its axial direction with the input shaft, improving the detection accuracy and stability of the rotary transformer. In this embodiment, by making the outer diameter of the second segment larger than the inner diameter of the input shaft, the oil guide pipe not only increases the amount of oil delivered to the motor shaft but also makes the axial positioning of the rotary transformer, oil guide pipe, and input shaft more stable, thereby improving the detection accuracy and stability of the rotary transformer.

[0010] In one embodiment, the outer diameter of the second segment is less than or equal to the inner diameter of the input shaft. In this embodiment, the oil guide pipe can be axially fixed by forming a stepped hole in the inner cavity of the input shaft.

[0011] In one embodiment, a portion of the stator of the rotary transformer surrounds the outer periphery of the second segment, and the length of the second segment along the axial direction of the input shaft is greater than the length of the portion of the stator of the rotary transformer.

[0012] In this embodiment, the stator of the rotary transformer surrounds the outer periphery of the rotor. A portion of the stator protrudes axially from the rotor along the input shaft. The second section of the oil guide pipe is adjacent to the first section that fixes the stator of the rotary transformer, such that a portion of the stator surrounds the outer periphery of the second section. In this embodiment, since the axial end face of the second section facing away from the first section is used to abut against the axial end face of the input shaft, the length of the second section along the input shaft is greater than the length of the portion of the stator along the input shaft. This creates a gap between the portion of the stator and the axial end face of the input shaft abutting against the second section, preventing interference between the portion of the stator and the rotating input shaft and thus affecting the stability of the stator, thereby improving the detection accuracy and stability of the rotary transformer.

[0013] In one embodiment, the reducer end cover includes a bearing groove and a through hole. The peripheral wall of the bearing groove is used to fix the outer ring of the bearing of the input shaft. The groove opening of the bearing groove faces one end of the input shaft. The through hole extends through the bottom of the bearing groove along the axial direction of the input shaft. The through hole is used to accommodate at least a portion of the rotor and at least a portion of the stator of the rotary transformer. The hole wall of the through hole is used to fix the stator of the rotary transformer.

[0014] In this embodiment, the opening of the bearing groove faces one end of the input shaft coupled to the motor shaft along the axial direction of the input shaft. The bearing groove is used to accommodate the bearing of the input shaft, and the peripheral wall of the bearing groove is used to fix the outer ring of the bearing of the input shaft. The through hole penetrates the bottom of the bearing groove along the axial direction of the input shaft. In this embodiment, the through hole is used to accommodate at least part of the rotor and at least part of the stator of the rotary transformer. The hole wall of the through hole is used to fix the stator of the rotary transformer, so that the rotary transformer can be accommodated in the through hole, and at least part of the stator and at least part of the rotor of the rotary transformer overlaps with the hole wall of the through hole in the axial direction of the input shaft, so that the axial dimension of the powertrain is small. In addition, the through hole formed by the bottom of the bearing groove is reused to accommodate at least part of the stator and at least part of the rotor of the rotary transformer, so that there is no need to form an additional protrusion structure on the outside of the reducer end cover to accommodate and fix the stator and rotor of the rotary transformer, simplifying the reducer end cover structure.

[0015] In one embodiment, the through hole includes a fixed section and an abutment section. The fixed section is arranged on the side of the abutment section away from the groove of the bearing groove. The inner diameter of the fixed section is larger than the inner diameter of the abutment section. The stator of the rotary transformer includes a protrusion protruding away from the rotor of the rotary transformer. The fixed section is used to fix the protrusion, and the end face of the abutment section facing the fixed section is used to abut the protrusion along the axial direction of the input shaft.

[0016] In this embodiment, the fixing section and the abutment section of the through hole are arranged adjacent to each other along its axial direction. By setting the inner diameter of the fixing section to be larger than the inner diameter of the abutment section, and by the abutment section abutting the protrusion and the fixing section fixing the protrusion, the stator of the rotary transformer can be limited and fixed in the through hole along the axial direction of the input shaft. By forming two sections with different inner diameters on the hole wall of the through hole, the stator is fixed to the section with the larger inner diameter and abutted by the axial end face of the section with the smaller inner diameter. This allows the installation of the stator of the rotary transformer to reduce the axial dimension of the powertrain while maintaining stable fixation, thereby improving the detection accuracy and stability of the rotary transformer.

[0017] In one embodiment, the bearing groove is also used to accommodate shims, which are arranged axially along the input shaft between the stator of the rotary transformer and the outer or inner ring of the bearing.

[0018] In this embodiment, since the through holes accommodating the stator and rotor of the rotary transformer penetrate the bottom of the bearing slot accommodating the bearing, the stator of the rotary transformer is adjacent to the bearing in the bearing slot. The stator of the rotary transformer is fixed in the through hole and remains stationary, while the inner ring of the bearing rotates with the input shaft. In this embodiment, by arranging shims between the stator of the rotary transformer and the outer or inner ring of the bearing, the shims separate the stator of the rotary transformer from the inner ring of the bearing, avoiding interference between the stator of the rotary transformer and the inner ring of the bearing, and improving the stability of the rotary transformer and the bearing.

[0019] In one embodiment, the diameter of the through hole is larger than the inner diameter of the input shaft, and the diameter of the through hole is smaller than the inner diameter of the outer ring of the bearing.

[0020] In this embodiment, since the through hole needs to accommodate the stator and rotor of the rotary transformer, as well as the oil guide pipe for fixing the rotor of the rotary transformer, the diameter of the through hole is larger than the inner diameter of the input shaft. This ensures that the through hole has sufficient space to accommodate the stator, rotor, and oil guide pipe of the rotary transformer. Furthermore, the outer diameter of a portion of the oil guide pipe within the through hole is approximately equal to the outer diameter of a portion of the oil guide pipe within the input shaft. This facilitates the machining of the oil guide pipe and increases the flow area within the portion of the oil guide pipe located in the through hole, which is beneficial for increasing the amount of oil supplied to the motor shaft. Conversely, the diameter of the through hole is smaller than the inner diameter of the outer ring of the bearing housed in the bearing groove, preventing the through hole from being too large and ensuring that the bottom of the bearing groove has a position to abut against the outer ring of the bearing or a gasket.

[0021] In one embodiment, the reducer end cover further includes a cable outlet groove for accommodating a signal connector of a rotary transformer, the signal connector for connecting a signal harness of the rotary transformer, wherein the opening of the cable outlet groove is axially away from one end of the input shaft along the powertrain, and the cable outlet groove radially penetrates the wall of the through hole along the powertrain.

[0022] In this embodiment, by forming a cable outlet groove in the wall of the through hole to accommodate the signal connector, and the cable outlet groove extending radially through the wall of the through hole along the powertrain, the cable outlet groove extends radially along the powertrain and overlaps with the through hole along the axial direction of the powertrain. This eliminates the need to increase the bearing size of the powertrain. The opening of the cable outlet groove is axially away from the input shaft, allowing the signal connector of the rotary transformer to be inserted into the cable outlet groove from its opening along the axial direction of the powertrain when the stator of the rotary transformer is installed in the through hole. This facilitates the installation of the stator and signal connector. In this embodiment, by having the opening of the cable outlet groove axially away from the input shaft and extending radially through the wall of the through hole, the cable outlet groove can accommodate the signal connector of the rotary transformer while reducing the axial dimension of the powertrain, and also simplifies the installation process.

[0023] In one embodiment, the reducer end cover further includes a groove for accommodating the signal harness of the rotary transformer, wherein the groove opening is axially away from one end of the input shaft along the powertrain, and the groove is radially distributed on the outer periphery of the through hole and the bearing groove along the powertrain.

[0024] In this embodiment, the groove opening is positioned axially away from the input shaft of the powertrain, allowing the signal harness connected to the signal connector to be embedded into the groove from the same side of the reducer end cover while the rotary transformer stator and signal connector are being installed, making signal harness installation more convenient. In this embodiment, the grooves are radially distributed along the outer periphery of the through-hole and bearing groove, such that a portion of the groove wall shares the same wall as a portion of the through-hole and the bearing groove. This allows the groove for accommodating the signal harness to reuse the axial dimension of the through-hole, reducing the additional axial dimension. It also helps to make the outer side of the reducer end cover flatter, facilitating the formation of an electrical control groove on the side of the reducer end cover away from the motor shaft to accommodate functional components such as the power module controlled by the motor.

[0025] In one embodiment, the reducer end cover further includes a sealing plate, the sealing plate also having a slot covering the through hole and the groove, the sealing plate including a cable outlet hole extending through the sealing plate along the axial direction of the powertrain, the cable outlet hole being used to pass through the signal harness of the rotary transformer, the cable outlet hole being opposite the groove along the axial direction of the powertrain.

[0026] In this embodiment, a wire outlet hole is formed in the sealing plate of the sealing through hole, and the wire outlet hole is opposite to the groove, so that the signal harness of the rotary transformer contained in the groove can pass directly out from the wire outlet hole of the sealing plate, making the signal harness of the rotary transformer arranged neatly, which is beneficial to forming an electrical control groove on the outside of the reducer end cover.

[0027] In one embodiment, the reducer end cover further includes an oil outlet protrusion for conveying oil from the reducer end cover to an oil guide pipe, wherein the oil outlet protrusion extends into the oil guide pipe, and the oil outlet protrusion, the rotor of the rotary transformer, and the bore wall of the through hole are at least partially stacked along the radial direction of the input shaft.

[0028] In this embodiment, an oil outlet protrusion for conveying oil to the oil guide pipe extends into the oil guide pipe. The oil outlet protrusion, the rotor of the rotary transformer, and the wall of the through hole are at least partially stacked along the radial direction of the input shaft, so that the oil outlet protrusion is embedded in the through hole. It is not necessary to extend the oil guide pipe out of the through hole away from the motor shaft. This allows the oil outlet protrusion to reuse the axial space in the through hole, reducing the axial dimension of the combination of the oil outlet protrusion, the rotor of the rotary transformer, the oil guide pipe, and the through hole, which in turn helps to reduce the axial dimension of the powertrain.

[0029] In one embodiment, the reducer end cover further includes an oil outlet hole, which is distributed on the end face of the oil outlet protrusion facing the input shaft. The oil outlet hole is used to deliver oil to the oil guide pipe. In this embodiment, by distributing the oil outlet holes on the end face of the oil outlet protrusion facing the input shaft, the oil outlet holes and the inner cavity of the oil guide pipe are axially opposite each other, allowing the oil output from the oil outlet holes to directly enter the inner cavity of the oil guide pipe, thereby increasing the speed of oil delivery.

[0030] In one embodiment, the inner diameter of the portion of the oil guide tube used to accommodate the oil outlet protrusion is larger than the inner diameter of the other portions of the oil guide tube. In this embodiment, the smaller inner diameter of the other portions of the oil guide tube allows it to guide oil while maintaining strong structural strength, resulting in a more stable interference fit between the oil guide tube and the input shaft. The larger inner diameter of the portion accommodating the oil outlet protrusion allows the oil guide tube to accommodate the protrusion and enables a larger diameter for the oil outlet hole, thus improving the oil outlet efficiency. In this embodiment, the larger inner diameter of the portion of the oil guide tube used to accommodate the oil outlet protrusion ensures that the oil guide tube can accommodate an oil outlet protrusion with a large oil flow rate while maintaining strong structural strength. This, in turn, ensures the stability of the rotor of the rotary transformer fixed to the oil guide tube, improving the detection accuracy and stability of the rotary transformer.

[0031] In one embodiment, oil outlet protrusions are distributed on the sealing plate, and the oil outlet protrusions protrude along the axial direction of the powertrain toward the side of the reducer end cover away from the sealing plate. The sealing plate includes an oil inlet hole for receiving oil transmitted from the internal flow channel of the reducer end cover, and the opening of the oil inlet hole is oriented toward the motor shaft along the axial direction of the powertrain.

[0032] In one embodiment, the reducer end cover further includes an electrical control slot, the slot opening of which is opposite to one end of the input shaft. The electrical control slot is used to accommodate the functional components of the motor controller, and a rotary transformer is used to electrically connect the functional components of the motor controller. The stator of the rotary transformer is fixed to the axial wall of the electrical control slot.

[0033] In this embodiment, an electrical control slot is formed on the side of the reducer end cover away from the motor shaft to accommodate the functional components of the motor controller, reducing the electrical control housing and making the powertrain structure more compact. The motor controller, reducer, and drive motor are arranged along the axial direction of the powertrain, which helps to reduce the size of the powertrain in the direction perpendicular to the axial direction. In this application, the axial size is reduced by fixing the rotor of the rotary transformer to the oil guide pipe, making the powertrain smaller not only in the axial size but also in the size perpendicular to the axial direction, which is beneficial to the miniaturization of the powertrain.

[0034] In this embodiment, the resolver stator is fixed to the axial wall of the electrical control slot, resulting in a short connection line between the resolver stator and the motor controller. For a powertrain where the motor controller, reducer, and drive motor are arranged axially along the powertrain axis, placing the resolver at the end of the motor shaft away from the reducer requires the resolver's signal harness to pass sequentially through the motor housing and reducer housing to reach the electrical control compartment in the reducer end cover. This results in a long signal harness, necessitating consideration of avoiding the stator, rotor, and gear assembly of the drive motor, further complicating the signal harness arrangement. In this embodiment, an electrical control slot is formed on the side of the reducer end cover away from the motor shaft to accommodate the motor controller, and the resolver rotor is placed at one end of the oil guide pipe inside the reducer input shaft. This brings the resolver closer to the electrical control slot, allowing the resolver's signal harness to connect to the motor controller in the electrical control slot via a shorter path. This simplifies the signal harness arrangement and reduces costs.

[0035] In one embodiment, the oil guide is a metal oil guide, and the metal oil guide is interference-fitted with the rotor of the rotary transformer.

[0036] The rotor of a rotary transformer is generally made of metal, and the input shaft of a reducer is also generally made of metal. Since the oil guide pipe needs to be fixed to the input shaft and rotate with it, as well as to fix the rotor of the rotary transformer, in this embodiment, the oil guide pipe is made of metal. This allows the oil guide pipe to be interference-fitted with the rotor of the rotary transformer to achieve stable fixation, and also allows the oil guide pipe to be interference-fitted with the input shaft to achieve stable fixation, thereby improving the detection accuracy and stability of the rotary transformer.

[0037] Secondly, this application provides an electric vehicle, which includes a powertrain as described in any of the preceding claims, wherein the drive motor of the powertrain drives the wheels via a reducer. In the embodiments of this application, the rotor of the rotary transformer in the powertrain is arranged at one end of an oil guide pipe located inside the input shaft cavity of the reducer. The oil guide pipe is reused to guide oil to the motor shaft and support the rotary transformer, eliminating the need to increase the length of the input shaft or the motor shaft, and eliminating the need to add additional structural components to fix the rotary transformer. This reduces the axial dimension of the powertrain and simplifies the powertrain manufacturing process, making the powertrain highly adaptable to electric vehicles and meeting the installation requirements of small axial dimensions. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments of this application will be described below.

[0039] Figure 1 This is a schematic diagram of an electric vehicle provided in an embodiment of this application;

[0040] Figure 2 This is a schematic diagram of a powertrain provided in an embodiment of this application;

[0041] Figure 3 This is a schematic diagram of a powertrain provided in an embodiment of this application;

[0042] Figure 4 This is an exploded view of the input shaft, oil guide pipe, bearing, gasket, and rotary transformer provided in the embodiments of this application;

[0043] Figure 5 This is a cross-sectional schematic diagram of a powertrain provided in an embodiment of this application;

[0044] Figure 6 yes Figure 5 A magnified view of part M in the middle;

[0045] Figure 7 This is a schematic diagram of an oil guide tube provided in an embodiment of this application;

[0046] Figure 8 This is a partial cross-sectional schematic diagram of the powertrain provided in an embodiment of this application;

[0047] Figure 9 This is a schematic diagram of a reducer end cover provided in an embodiment of this application;

[0048] Figure 10 This is an exploded view of a reducer end cover provided in an embodiment of this application;

[0049] Figure 11This is a schematic diagram of a reducer end cover without a sealing plate provided in an embodiment of this application;

[0050] Figure 12 This is a schematic diagram of a sealing plate provided in an embodiment of this application. Detailed Implementation

[0051] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0052] To minimize the axial dimension of the powertrain occupied by the rotary transformer and simplify the powertrain manufacturing process, the reducer end cover of the powertrain provided in this application is used to fix the outer ring of the bearing on the input shaft of the reducer. One end of the input shaft away from the reducer end cover is used to couple the motor shaft of the drive motor. The inner cavity of the input shaft is used to fix and accommodate one end of the oil guide pipe, which is used to transport the oil output from the reducer end cover to the motor shaft. The other end of the oil guide pipe extends out of the inner cavity of the input shaft and is used to fix the rotor of the rotary transformer. The stator of the rotary transformer is fixed to the reducer end cover.

[0053] In this embodiment, the rotor of the rotary transformer is arranged at one end of the oil guide pipe located in the inner cavity of the input shaft. The oil guide pipe is reused to guide oil to the motor shaft and support the rotary transformer. There is no need to increase the length of the input shaft or the motor shaft, nor is there a need to add additional structural components to fix the rotary transformer. This simplifies the powertrain process design and makes the installation of the rotary transformer more flexible.

[0054] Figure 1 This is a schematic diagram of an electric vehicle 1 provided in an embodiment of this application. Figure 1 As shown, the electric vehicle 1 includes a powertrain 10, a frame 20, a power battery 30, and wheels 40. The powertrain 10 and the power battery 30 are fixed to the frame 20. The powertrain 10 receives power from the power battery 30 and drives the wheels 40. In this embodiment, the power battery 30 may also be referred to as a battery pack. In this embodiment, the electric vehicle 1 refers to a wheeled device driven or towed by a power unit.

[0055] Figure 2 This is a schematic diagram of a powertrain 10 provided in an embodiment of this application. For example... Figure 2 As shown, the powertrain 10 includes a drive motor 11, a reducer 12, and a motor controller 13.

[0056] In this embodiment, the motor controller 13 receives DC power from the power battery 30 and outputs AC power to the drive motor 11. The stator of the drive motor 11 receives the AC power to drive the rotor and motor shaft to rotate. The drive motor 11 is used to drive the reducer 12. The reducer 12 is used to drive the wheels 40 of the electric vehicle 1.

[0057] In this embodiment, the reducer 12 includes an input shaft, an intermediate shaft, an output shaft, and multiple bearings. The input shaft, intermediate shaft, and output shaft are rotatably connected to the inner wall of the reducer housing via the bearings. The motor shaft of the drive motor 11 is used to drive the input shaft of the reducer 12. The input shaft of the reducer 12 is connected to the output shaft of the reducer 12 via the intermediate shaft and a gear fixed to the intermediate shaft. The drive motor 11 converts the electrical energy provided by the motor controller 13 into kinetic energy and transmits the kinetic energy to the input shaft of the reducer 12. The input shaft of the reducer 12 transmits power to the internal gears of the reducer 12, and the output shaft of the reducer 12 transmits the power of the drive motor 11 to the wheel 40. The motor controller includes at least one functional component such as a power module, circuit board, bus capacitor, filter, and heat sink.

[0058] In one embodiment, the powertrain 10 further includes a rotary transformer, which serves as a position sensor for detecting the rotational position and speed of the drive motor's rotor. The rotary transformer includes a stator and a rotor. The stator of the rotary transformer remains fixed, while the rotor is fixed to the motor shaft or to a component fixed to the motor shaft. The rotor rotates relative to the stator. The rotary transformer generates a magnetic field through the excitation windings of its stator, and modulates the magnetic field distribution using the spatial position of the rotor's salient poles. This induces a high-frequency signal with amplitude varying with angle in the orthogonal sine / cosine windings, thereby obtaining the absolute angle and speed of the drive motor's rotor.

[0059] In traditional rotary transformer rotor arrangement schemes, the rotary transformer rotor is usually directly mounted on one end of the drive motor shaft or fixed to the drive motor shaft through an additional structure. This occupies a large axial space, resulting in an increase in the overall size of the powertrain, making it difficult to meet the powertrain's requirements for compact and lightweight design.

[0060] This application arranges the rotor of the rotary transformer at one end of the oil guide pipe located inside the input shaft cavity, reusing the oil guide pipe to achieve the functions of guiding oil to the motor shaft and supporting the rotary transformer. There is no need to increase the length of the input shaft or the motor shaft, nor is there a need to add additional structural components to fix the rotary transformer, which simplifies the powertrain process design and makes the installation of the rotary transformer more flexible.

[0061] The powertrain provided in this application is described in detail below.

[0062] Figure 3 This is a schematic diagram of a powertrain 10 provided in an embodiment of this application.

[0063] In one embodiment, the powertrain 10 includes a reducer housing 200 and a reducer end cap 300, such as Figure 3 As shown, the reducer end cover 300 is used to enclose the reducer housing 200 to form a reducer receiving cavity, which is used to accommodate the gear assembly of the reducer 12. The input shaft of the reducer 12 is mounted on the reducer end cover 300 and the reducer housing 200 through bearings.

[0064] In one embodiment, the powertrain 10 further includes a motor housing 100, such as Figure 3 As shown, the motor housing 100 is used to enclose the reducer housing 200 to form a motor receiving cavity, which is used to accommodate the rotor 112 and stator 113 of the drive motor 11, and the circumferential sidewall of the motor housing 100 is used to fix the stator 113 of the drive motor 11.

[0065] In one embodiment, the reducer end cover 300, reducer housing 200, and motor housing 100 are arranged sequentially along the axial direction O of the powertrain 10. The side of the reducer end cover 300 facing away from the motor housing 100 includes an electrical control groove 308 (not shown), which is used to accommodate the functional components of the motor controller 13. The opening of the electrical control groove 308 faces away from the motor housing 100 along the axial direction O of the powertrain 10, and the electrical control groove 308 is used to enclose the electrical control cover plate. In this embodiment, the powertrain 10 is arranged in a T-shape, such that the motor controller 13, reducer, and drive motor 11 are arranged along the axial direction O of the powertrain 10, which helps to reduce the size of the powertrain 10 in its direction perpendicular to the axial direction. The installation arrangement scheme of the rotary transformer in this embodiment is applicable to Figure 3 The powertrain with a T-shaped architecture is shown.

[0066] In one embodiment, the reducer housing 200 includes a reducer slot (not shown) and a motor slot (not shown) arranged opposite to each other along its axial direction. The slot openings of the reducer slot and the motor slot are opposite to each other. The reducer slot is used to accommodate the gear assembly of the reducer 12, and the motor slot is used to accommodate the stator 113 and rotor of the drive motor 11. The circumferential wall of the motor slot is used to fix the stator 113 of the drive motor 11. In this embodiment, the reducer housing 200 is an integrated housing for accommodating the gear assembly of the reducer 12 and the drive motor 11. The installation arrangement scheme of the rotary transformer in this embodiment is also applicable to powertrains where the reducer housing 200 is an integrated housing for accommodating the gear assembly of the reducer 12 and the drive motor 11. In one embodiment, the reducer housing 200 also includes an electrical control slot 308 (not shown), which is stacked above the reducer slot and the motor slot. The electrical control slot 308 is used to accommodate the functional components of the motor controller 13. In this embodiment, the reducer housing 200 is an integrated housing for accommodating the gear assembly of the reducer 12, the drive motor 11, and the motor controller 13. The electrical control slot 308 encloses the electrical control cover plate, and the motor slot encloses the motor cover plate.

[0067] Figure 4 This is an exploded view of the input shaft 121, oil guide pipe 15, bearing 122, gasket 123, and rotary transformer 14 provided in the embodiments of this application. Figure 5 This is a cross-sectional schematic diagram of the powertrain 10 provided in an embodiment of this application. Figure 6 yes Figure 5 A magnified view of part M in the middle. Figure 7 This is a schematic diagram of an oil guide tube 15 provided in an embodiment of this application. Figure 8 This is a partial cross-sectional schematic diagram of the powertrain 10 provided in an embodiment of this application.

[0068] Combination Figures 4 to 7 In one embodiment, the reducer end cover 300 of the powertrain 10 is used to fix the outer ring 1221 of the bearing 122 of the input shaft 121 of the reducer 12. One end of the input shaft 121 away from the reducer end cover 300 is used to couple the motor shaft 111 of the drive motor 11. The inner cavity 1210 of the input shaft 121 is used to fix and accommodate one end 151 of the oil guide pipe 15. The oil guide pipe 15 is used to transport the oil output from the reducer end cover 300 to the motor shaft 111. The other end 152 of the oil guide pipe 15 extends out of the inner cavity 1210 of the input shaft 121. The other end 152 of the oil guide pipe 15 is used to fix the rotor 142 of the rotary transformer 14. The stator 141 of the rotary transformer 14 is fixed to the reducer end cover 300.

[0069] In the embodiments of this application, combined with Figure 5 and Figure 6The bearing 122 of the input shaft 121 of the reducer 12 is mounted on the reducer end cover 300. The outer ring 1221 of the bearing 122 is fixed to the reducer end cover 300, and the inner ring 1222 of the bearing 122 is fixed to the input shaft 121. The end of the input shaft 121 facing away from the reducer end cover 300 is used to couple the motor shaft 111 of the drive motor 11 to receive power. In one embodiment, the input shaft 121 is coupled to the motor shaft 111 via a spline, so that the input shaft 121 rotates with the motor shaft 111.

[0070] Among them, combined Figure 5 and Figure 6 The input shaft 121 is hollow, and its inner cavity 1210 is used to accommodate one end 151 of the oil guide pipe 15. The oil guide pipe 15 is used to transport oil output from the reducer end cover 300 to the motor shaft 111, and through the motor shaft 111 to transport oil to the rotor 112 of the drive motor 11 to cool the rotor 112 of the drive motor 11. The inner cavity 1210 of the input shaft 121 is also used to fix the oil guide pipe 15, so that the oil guide pipe 15 rotates with the input shaft 121. Specifically, the cavity wall of the inner cavity 1210 of the input shaft 121 is interference-fitted with the oil guide pipe 15 to fix the oil guide pipe 15 to the input shaft. In one embodiment, such as Figure 5 As shown, one end of the motor shaft 111 used for coupling the input shaft 121 is housed within the inner cavity 1210 of the input shaft 121, as... Figure 6 As shown, the inner cavity 1510 of the oil guide pipe 15 is aligned and connected with the inner cavity 1110 of the motor shaft 111 along the axial direction O of the input shaft 121, so that the conveying oil in the oil guide pipe 15 enters the motor shaft 111. In one embodiment, the peripheral wall of the motor shaft 111 has multiple openings (not shown), and the oil in the inner cavity of the motor shaft 111 is conveyed to the rotor 112 of the drive motor 11 through the multiple openings.

[0071] Among them, such as Figure 6 As shown, the other end 152 of the oil guide pipe 15 extends out of the inner cavity 1210 of the input shaft 121, so that the other end 152 of the oil guide pipe 15 is exposed on the input shaft 121. The other end 152 of the oil guide pipe 15 is used to fix the rotor 142 of the rotary transformer 14, so that the rotor 142 of the rotary transformer 14 can rotate with the oil guide pipe 15, and the oil guide pipe 15 rotates with the input shaft 121, thereby enabling the rotor 142 of the rotary transformer 14 to rotate with the motor shaft 111. The stator 141 of the rotary transformer 14 is then fixed to the reducer end cover 300, so that the rotary transformer 14 can detect the speed and angle of the motor shaft 111 and the rotor 112 of the drive motor 11.

[0072] In this embodiment, the rotor 142 of the rotary transformer 14 is arranged at one end 151 of the oil guide pipe 15 in the inner cavity 1210 of the input shaft 121. The oil guide pipe 15 is reused to realize the functions of supplying oil from the reducer end cover 300 to the motor shaft 111 and supporting and fixing the rotor 142 of the rotary transformer 14. There is no need to increase the length of the input shaft 121 and the length of the motor shaft 111. This is beneficial to reduce the axial dimension O of the powertrain 10. There is also no need to add additional structural components to fix the rotor 142 of the rotary transformer 14, which is beneficial to simplify the process design of the powertrain 10. Furthermore, since the motor shaft 111 needs to fix multiple components such as the rotor 112 of the drive motor 11, bearings, and grounding springs, if the rotor 142 of the rotary transformer 14 is also fixed to the motor shaft 111, the number of mounting components on the motor shaft 111 will increase. This not only makes the installation process more complicated but also makes the motor shaft 111 longer. Lengthening the motor shaft 111 requires changing the size design of the motor shaft 111 and redesigning the dynamic balance of the rotor 112 of the corresponding drive motor 11. Compared to fixing the rotor 142 of the rotary transformer 14 to the motor shaft 111, it is only necessary to fix the rotor 142 of the rotary transformer 14 to the oil guide pipe 15, which simplifies the process and makes the installation of the rotor 142 of the rotary transformer 14 more flexible, without having to consider the influence of the rotor, bearings, and other components fixed to the motor shaft 111.

[0073] In one embodiment, combined with Figure 6 and Figure 7 The other end 152 of the oil guide pipe 15 includes a first section 1521 and a second section 1522. The second section 1522 is arranged between the first section 1521 and one end 151 of the oil guide pipe 15. The first section 1521 is used to fix the rotor 142 of the rotary transformer 14. The outer diameter of the second section 1522 is larger than the outer diameter of the first section 1521. The second section 1522 is used to abut against the rotor 142 of the rotary transformer 14 along the axial direction O of the input shaft 121.

[0074] In the embodiments of this application, such as Figure 6 As shown, the outer diameter of the first segment 1521 of the rotor 142 used to fix the rotary transformer 14 is smaller than the outer diameter of the second segment 1522, so that the second segment 1522 abuts against the rotor 142 of the rotary transformer 14 along the axial direction O of the input shaft 121. This allows the rotor 142 of the rotary transformer 14 to be confined to the oil guide pipe 15 along the axial direction O of the input shaft 121, preventing the rotor 142 of the rotary transformer 14 and the oil guide pipe 15 from moving relative to each other along the axial direction O of the input shaft 121, thereby improving the detection accuracy and detection stability of the rotary transformer 14.

[0075] In one embodiment, the outer diameter of the second segment 1522 is larger than the inner diameter of the input shaft 121, and the axial end face of the second segment 1522 facing away from the first segment 1521 is used to abut against the axial end face of the input shaft 121 along the axial direction O of the input shaft 121.

[0076] In the embodiments of this application, such as Figure 6 As shown, the outer diameter of the second segment 1522 is larger than the inner diameter of the input shaft 121, which is beneficial for forming a flow channel with a larger inner diameter in the oil guide pipe 15, thereby increasing the amount of oil delivered by the oil guide pipe 15 to the motor shaft 111. Furthermore, the larger outer diameter of the second segment 1522 allows the axial end face of the second segment 1522 away from the first segment 1521 to abut against the axial end face of the input shaft 121 along the axial direction O. This ensures that the oil guide pipe 15 and the input shaft 121 are relatively fixed along their axial directions, thereby fixing the rotor 142 of the rotary transformer 14, which is fixed by the oil guide pipe 15, and the input shaft 121 along their axial directions, improving the detection accuracy and stability of the rotary transformer 14. In this embodiment, by making the outer diameter of the second segment 1522 larger than the inner diameter of the input shaft 121, the oil guide pipe 15 not only increases the amount of oil delivered to the motor shaft 111, but also makes the rotary transformer 14, the oil guide pipe 15 and the input shaft 121 more axially stable, thereby improving the detection accuracy and detection stability of the rotary transformer 14.

[0077] In one embodiment, a portion of the stator 141 of the rotary transformer 14 surrounds the outer periphery of the second segment 1522, and the length of the second segment 1522 along the axial direction of the input shaft 121 is greater than the length of the portion of the stator 141 of the rotary transformer 14.

[0078] In the embodiments of this application, such as Figure 6As shown, the stator 141 of the rotary transformer 14 surrounds the outer periphery of the rotor 142 of the rotary transformer 14. A portion of the stator 141 of the rotary transformer 14 protrudes from the rotor 142 of the rotary transformer 14 along the axial direction O of the input shaft 121. The second section 1522 of the oil guide pipe 15 is adjacent to the first section 1521 that fixes the stator 141 of the rotary transformer 14, such that a portion of the stator of the rotary transformer 14 surrounds the outer periphery of the second section 1522. In this embodiment, since the axial end face of the second segment 1522 facing away from the first segment 1521 is used to abut against the axial end face of the input shaft 121 along the axial direction O, the length of the second segment 1522 along the axial direction O of the input shaft 121 is greater than the length of part of the stator 141 of the rotary transformer 14 along the axial direction O of the input shaft 121. This makes the part of the stator 141 of the rotary transformer 14 and the axial end face of the input shaft 121 abutting against the second segment 1522 spaced apart, avoiding interference between the part of the stator 141 of the rotary transformer 14 and the rotating input shaft 121, which would affect the stability of the stator 141 of the rotary transformer 14, thereby improving the detection accuracy and detection stability of the rotary transformer 14.

[0079] In one embodiment, the reducer end cover 300 includes a bearing groove 301 and a through hole 302. The groove peripheral wall 3011 of the bearing groove 301 is used to fix the outer ring 1221 of the bearing 122 of the input shaft 121. The groove opening of the bearing groove 301 faces one end of the input shaft 121. The through hole 302 penetrates the bottom 3012 of the bearing groove 301 along the axial direction O of the input shaft 121. The through hole 302 is used to accommodate at least a portion of the rotor 142 and at least a portion of the stator 141 of the rotary transformer 14. The hole wall of the through hole 302 is used to fix the stator 141 of the rotary transformer 14.

[0080] In the embodiments of this application, combined with Figure 6 and Figure 8The opening of the bearing groove 301 is oriented along the axial direction O of the input shaft 121 toward one end of the coupling motor shaft 111 of the input shaft 121. The bearing groove 301 is used to accommodate the bearing 122 of the input shaft 121. The groove peripheral wall 3011 of the bearing groove 301 is used to fix the outer ring 1221 of the bearing 122 of the input shaft 121. The through hole 302 penetrates the bottom 3012 of the bearing groove 301 along the axial direction O of the input shaft 121. In this embodiment, the through hole 302 is used to accommodate at least a portion of the rotor 142 and at least a portion of the stator 141 of the rotary transformer 14. The hole wall of the through hole 302 is used to fix the stator 141 of the rotary transformer 14, so that the rotary transformer 14 can be accommodated in the through hole 302, and at least a portion of the stator 141 and at least a portion of the rotor of the rotary transformer 14 overlaps with the hole wall of the through hole 302 in the axial direction O of the input shaft 121, reducing the total axial dimension of the rotary transformer 14 and the through hole 302, making the axial dimension O of the powertrain 10 smaller. In addition, the through hole 302 formed by the bottom 3012 of the bearing groove 301 is reused to accommodate at least a portion of the stator 141 and at least a portion of the rotor of the rotary transformer 14, so that there is no need to form a protrusion 1411 structure on the outside of the reducer end cover 300 to accommodate and fix the stator 141 and rotor of the rotary transformer 14, simplifying the structure of the reducer end cover 300.

[0081] In one embodiment, the stator 141 of the rotary transformer 14 is fixed to the surface of the reducer end cover 300 away from the motor shaft 111, thereby increasing the axial dimension O of the powertrain 10. Alternatively, the stator 141 of the rotary transformer 14 can be fixed to the surface of the reducer end cover 300 away from the motor shaft 111, provided the axial dimension requirements are met.

[0082] In one embodiment, the through hole 302 includes a fixing section 3021 and an abutting section 3022. The fixing section 3021 is arranged on the side of the abutting section 3022 away from the groove opening of the bearing groove 301. The inner diameter of the fixing section 3021 is larger than the inner diameter of the abutting section 3022. The stator 141 of the rotary transformer 14 includes a protrusion 1411 protruding away from the rotor 142 of the rotary transformer 14. The fixing section 3021 is used to fix the protrusion 1411. The end face of the abutting section 3022 facing the fixing section 3021 is used to abut the protrusion 1411 along the axial direction O of the input shaft 121.

[0083] In the embodiments of this application, combined with Figure 6 and Figure 8The fixing section 3021 and the abutting section 3022 of the through hole 302 are arranged adjacent to each other along its axial direction. By setting the inner diameter of the fixing section 3021 to be larger than the inner diameter of the abutting section 3022, and by the abutting section 3022 abutting against the protrusion 1411, and the fixing section 3021 fixing the protrusion 1411, the stator 141 of the rotary transformer 14 can be limited and fixed in the through hole 302 along the axial direction O of the input shaft 121. By forming two sections with different inner diameters on the hole wall of the through hole 302, the stator 141 of the rotary transformer 14 is fixed to the section with the larger inner diameter and abutted by the axial end face of the section with the smaller inner diameter. This allows the installation of the stator 141 of the rotary transformer 14 to reduce the axial dimension O of the power assembly 10 while also being stably fixed, thereby improving the detection accuracy and detection stability of the rotary transformer 14.

[0084] In one embodiment, the bearing groove 301 is also used to receive a gasket 123, which is arranged axially along the input shaft 121 between the stator 141 of the rotary transformer 14 and the outer ring 1221 or the inner ring 1222 of the bearing 122.

[0085] In the embodiments of this application, such as Figure 6 As shown, since the through hole 302 accommodating the stator 141 and rotor of the rotary transformer 14 penetrates the bottom of the bearing groove 301 accommodating the bearing 122, the stator 141 of the rotary transformer 14 is adjacent to the bearing 122 in the bearing groove 301. The stator 141 of the rotary transformer 14 is fixed in the through hole 302 and remains stationary. The inner ring 1222 of the bearing 122 rotates with the input shaft 121. In this embodiment, by arranging shims 123 between the stator 141 of the rotary transformer 14 and the outer ring 1221 or the inner ring 1222 of the bearing 122, the shims 123 separate the stator 141 of the rotary transformer 14 from the inner ring 1222 of the bearing 122, thereby avoiding interference between the stator 141 of the rotary transformer 14 and the inner ring 1222 of the bearing 122 and improving the stability of the rotary transformer 14 and the bearing 122.

[0086] In one embodiment, the diameter of the through hole 302 is larger than the inner diameter of the input shaft 121, and the diameter of the through hole 302 is smaller than the inner diameter of the outer ring 1221 of the bearing 122.

[0087] In the embodiments of this application, such as Figure 6As shown, since the through hole 302 needs to accommodate the stator 141 and rotor 142 of the rotary transformer 14, as well as the oil guide pipe 15 used to fix the rotor 142 of the rotary transformer 14, the diameter of the through hole 302 is larger than the inner diameter of the input shaft 121. This ensures that the through hole 302 has sufficient space to accommodate the stator 141, rotor, and oil guide pipe 15 of the rotary transformer 14. Furthermore, the outer diameter of a portion of the oil guide pipe 15 within the through hole 302 is approximately equal to the outer diameter of a portion of the oil guide pipe 15 within the input shaft 121. This makes the oil guide pipe 15 easier to process and also results in a larger flow area within the portion of the oil guide pipe 15 located in the through hole 302, which is beneficial for increasing the amount of oil supplied to the motor shaft 111. Meanwhile, the diameter of the through hole 302 is smaller than the inner diameter of the outer ring 1221 of the bearing 122 accommodated in the bearing groove 301. This prevents the through hole 302 from being too large, ensuring that the bottom of the bearing groove 301 has a position to abut against the outer ring 1221 of the bearing 122 or the gasket 123.

[0088] Figure 9 This is a schematic diagram of a reducer end cover 300 provided in an embodiment of this application. Figure 10 This is an exploded view of a reducer end cover 300 provided in an embodiment of this application. Figure 11 This is a schematic diagram of a reducer end cover 300 without a sealing plate 305 provided in an embodiment of this application. Figure 12 This is a schematic diagram of a sealing plate 305 provided in an embodiment of this application.

[0089] In one embodiment, the reducer end cover 300 further includes a cable outlet groove 303, combined with Figures 8 to 11 The cable outlet 303 is used to accommodate the signal connector 143 of the rotary transformer 14. The signal connector 143 is used to connect the signal harness 144 of the rotary transformer 14. The opening of the cable outlet 303 is away from the end of the input shaft 121 along the axial direction O of the power assembly 10. The cable outlet 303 penetrates the wall of the through hole 302 along the radial direction R of the power assembly 10.

[0090] In this embodiment, the rotary transformer 14 is connected to the signal harness 144 and the stator 141 via a signal connector 143. This allows the excitation information of the stator 141 of the rotary transformer 14 to be transmitted to the motor controller 13 via the signal connector 143 and the signal harness 144, for detecting the rotational speed and angle of the rotor 112 of the drive motor 11. In one embodiment, the signal connector 143 and the signal harness 144 can be connected via a plug-in connector. An exemplary embodiment shows that the end of the signal connector 143 facing away from the stator 141 of the rotary transformer 14 has both a male and a female connector, while the end of the signal harness 144 facing the signal connector 143 has both a male and a female connector.

[0091] In the embodiments of this application, such as Figure 8 and Figure 11 As shown, by forming a cable outlet groove 303 to accommodate the signal connector 143 in the wall of the through hole 302, and the cable outlet groove 303 extending through the wall of the through hole 302 along the radial direction R of the powertrain 10, the cable outlet groove 303 extends along the radial direction R of the powertrain 10, and the cable outlet groove 303 overlaps with the through hole 302 along the axial direction O of the powertrain 10, so that the cable outlet groove 303 does not require additional bearing dimensions in the powertrain 10. Combined with... Figure 10 and Figure 11 The opening of the cable outlet slot 303 is located away from the input shaft 121 along the axial direction O of the powertrain 10. This allows the signal connector 143 of the rotary transformer 14 to be inserted into the cable outlet slot 303 along the axial direction O of the powertrain 10 when the stator 141 of the rotary transformer 14 is installed in the through hole 302. This facilitates the installation of the stator 141 and the signal connector 143 of the rotary transformer 14. In this embodiment, by having the opening of the cable outlet slot 303 located away from the input shaft 121 along the axial direction O of the powertrain 10, and the cable outlet slot 303 penetrating the wall of the through hole 302 along the radial direction R of the powertrain 10, the cable outlet slot 303 can accommodate the signal connector 143 of the rotary transformer 14 while reducing the axial dimension O of the powertrain 10. This also makes the installation process more convenient.

[0092] In one embodiment, the reducer end cover 300 further includes a groove 304, such as Figure 8 and Figure 10 As shown, the groove 304 is used to accommodate the signal harness 144 of the rotary transformer 14. The groove opening of the groove 304 is away from one end of the input shaft 121 along the axial direction O of the powertrain 10. The groove 304 is distributed along the radial direction R of the powertrain 10 on the outer periphery of the through hole 302 and the bearing groove 301.

[0093] In this embodiment, the groove opening of the recess 304 is positioned away from the input shaft 121 along the axial direction O of the powertrain 10. This allows the signal harness 144 connected to the signal connector 143 to be inserted into the recess 304 from the same side of the reducer end cover 300 while the stator of the rotary transformer 14 and the signal connector 143 are being installed, making the installation of the signal harness 144 more convenient. In this embodiment, as... Figure 8 and Figure 11As shown, the grooves 304 are distributed along the radial R of the powertrain 10 on the outer periphery of the through hole 302 and the bearing groove 301, so that part of the groove wall of the groove 304 shares the same wall as part of the hole wall of the through hole 302 and part of the peripheral wall of the bearing groove 301. This allows the groove 304, which is used to accommodate the signal harness 144, to reuse the axial dimension of the through hole 302, reducing the additional axial dimension. It also helps to make the outer side of the reducer end cover 300 flatter, making it easier to form an electrical control groove 308 on the side of the reducer end cover 300 away from the motor shaft 111 to accommodate functional components such as the power module of the motor controller 13.

[0094] In one embodiment, the reducer end cover 300 further includes a sealing plate 305, combined with Figures 9 to 12 The sealing plate 305 also has a slot covering the through hole 302 and the groove 304. The sealing plate 305 includes a wire outlet hole 3051, which extends through the sealing plate 305 along the axial direction O of the powertrain 10. The wire outlet hole 3051 is used to pass through the signal harness 144 of the rotary transformer 14. The wire outlet hole 3051 is opposite to the groove 304 along the axial direction O of the powertrain 10.

[0095] In this embodiment, a wire outlet hole 3051 is formed in the sealing plate 305 of the sealing through hole 302, and the wire outlet hole 3051 is opposite to the groove 304, so that the signal wire harness 144 of the rotary transformer 14 contained in the groove 304 can directly pass through the wire outlet hole 3051 of the sealing plate 305, making the signal wire harness 144 of the rotary transformer 14 arranged neatly, which is beneficial to forming an electrical control groove 308 on the outside of the reducer end cover 300.

[0096] In this embodiment, the diameter of the outlet hole 3051 is smaller than the groove width of the groove 304, or the area of ​​the opening 3053 of the outlet hole 3051 is smaller than the groove opening area of ​​the groove 304. The groove 304 is used to accommodate the signal harness 144. The signal harness 144 is relatively long and occupies a large accommodating space, requiring a larger opening area of ​​the groove 304. The outlet hole 3051 is used to pass through the signal harness 144. The cross-sectional width of the signal harness 144 is smaller than its extending direction, requiring a smaller diameter of the outlet hole 3051. This allows the sealing plate 305 to cover the groove 304 while still allowing the signal harness 144 to pass through the outlet hole 3051 of the sealing plate 305. In one embodiment, the edge of the sealing plate 305 is used to seal the groove opening of the groove 304, and the hole wall of the outlet hole 3051 is sealed to the signal harness 144, preventing oil flowing from the through hole 302 from flowing out through the groove 304 and out of the outlet hole 3051.

[0097] In one embodiment, such as Figure 11 As shown, the groove 304 also extends to the outer periphery of the through hole 302, so that the sealing plate 305 can completely cover the through hole 302 when sealing the groove 304, thus preventing oil leakage.

[0098] In one embodiment, the reducer end cover 300 further includes an oil outlet protrusion 306, such as Figure 12 As shown, the oil outlet protrusion 306 is used to transport the oil from the reducer end cover 300 to the oil guide pipe 15, wherein, as Figure 6 As shown, the oil outlet protrusion 306 extends into the oil guide pipe 15, and the oil outlet protrusion 306, the rotor 142 of the rotary transformer 14 and the hole wall of the through hole 302 are at least partially stacked along the radial R of the input shaft 121.

[0099] In this embodiment, the oil outlet protrusion 306, used to transport oil to the oil guide pipe 15, extends into the oil guide pipe 15. The oil outlet protrusion 306, the rotor 142 of the rotary transformer 14, and the hole wall of the through hole 302 are at least partially stacked along the radial direction R of the input shaft 121, so that the oil outlet protrusion 306 is embedded in the through hole 302. It is not necessary to extend the oil guide pipe 15 out of the through hole 302 away from the side of the motor shaft 111. This allows the oil outlet protrusion 306 to reuse the axial space in the through hole 302, reducing the axial dimension of the combination of the oil outlet protrusion 306, the rotor 142 of the rotary transformer 14, the oil guide pipe 15, and the through hole 302, thereby helping to reduce the axial dimension of the powertrain 10.

[0100] In one embodiment, the reducer end cover 300 further includes an oil outlet 307, such as Figure 6 and Figure 12 As shown, oil outlet holes 307 are distributed on the end face of the oil outlet protrusion 306 facing the input shaft 121, and are used to deliver oil to the oil guide pipe 15. In this embodiment, by distributing the oil outlet holes 307 on the end face of the oil outlet protrusion 306 facing the input shaft 121, the oil outlet holes 307 and the inner cavity 1510 of the oil guide pipe 15 are axially opposite to each other, so that the oil output from the oil outlet holes 307 can directly enter the inner cavity 1510 of the oil guide pipe 15, thereby increasing the speed of oil delivery.

[0101] In one embodiment, such as Figure 6As shown, the inner diameter of the portion of the oil guide tube 15 used to accommodate the oil outlet protrusion 306 is larger than the inner diameter of the other portions of the oil guide tube 15, while the inner diameter of the other portions of the oil guide tube 15 is smaller. This allows the oil guide tube 15 to achieve oil guiding while also having strong structural strength, making the interference fit between the oil guide tube 15 and the input shaft 121 more stable. The larger inner diameter of the portion accommodating the oil outlet protrusion 306 allows the oil guide tube 15 to accommodate the oil outlet protrusion 306, and also allows the diameter of the oil outlet hole 307 of the oil outlet protrusion 306 to be larger, which is beneficial to improving the oil outlet efficiency of the oil outlet protrusion 306. In this embodiment, the inner diameter of the portion of the oil guide pipe 15 used to accommodate the oil outlet protrusion 306 is larger than the inner diameter of the other portions of the oil guide pipe 15. This allows the oil guide pipe 15 to accommodate the oil outlet protrusion 306, which can transmit a large flow of oil, while also ensuring strong structural strength. This, in turn, ensures the stability of the rotor 142 of the rotary transformer 14 fixed to the oil guide pipe 15, and improves the detection accuracy and stability of the rotary transformer 14.

[0102] In one embodiment, the oil outlet protrusions 306 are distributed on the sealing plate 305, such as... Figure 12 As shown, the oil outlet protrusion 306 protrudes 1411 along the axial direction O of the powertrain 10 toward the side of the reducer end cover 300 away from the sealing plate 305. The sealing plate 305 includes an oil inlet hole 3052, which is used to receive oil transmitted from the internal flow channel of the reducer end cover 300. The opening of the oil inlet hole 3052 is along the axial direction O of the powertrain 10 toward the motor shaft 111.

[0103] In one embodiment, the sealing plate 305 further includes an opening 3053, such as Figure 12 As shown, the opening 3053 is used to form an internal flow channel connecting the oil inlet 3052 and the oil outlet protrusion 306 or the oil outlet 307, wherein the axis of the opening 3053 is parallel to the radial direction R of the input shaft 121.

[0104] In one embodiment, the reducer end cover 300 includes an end cover oil outlet 309, such as Figure 11 As shown, the oil outlet 309 of the reducer end cover 300 is used to transport oil to the oil inlet 3052 of the sealing plate 305, wherein the oil outlet 309 of the reducer end cover 300 receives oil through the internal flow channel of the reducer end cover 300. In the embodiments of this application, the oil in the internal flow channel of the reducer end cover 300 can be output through the reducer housing 200 or other pipelines, which is not limited in this application.

[0105] In one embodiment, the reducer end cover 300 further includes an electrical control groove 308, such as Figure 12As shown, the slot opening of the electrical control slot 308 is away from the end of the input shaft 121. The electrical control slot 308 is used to accommodate the functional components of the motor controller 13. The rotary transformer 14 is used to electrically connect the functional components of the motor controller 13. The stator 141 of the rotary transformer 14 is fixed to the axial slot wall 3081 of the electrical control slot 308.

[0106] In this embodiment, an electrical control slot 308 is formed on the side of the reducer end cover 300 away from the motor shaft 111 to accommodate the functional components of the motor controller 13, reducing the electrical control housing and making the powertrain 10 structure compact. The motor controller 13, reducer and drive motor 11 are arranged along the axial direction O of the powertrain 10, which helps to reduce the size of the powertrain 10 in the direction perpendicular to the axial direction. In this application, the axial dimension is reduced by fixing the rotor 142 of the rotary transformer 14 to the oil guide pipe 15, so that the powertrain 10 is small not only in the axial dimension but also in the dimension perpendicular to the axial direction, which is conducive to the miniaturization of the powertrain 10.

[0107] In this embodiment, the stator 141 of the rotary transformer 14 is fixed to the axial groove wall 3081 of the electrical control groove 308, making the connection line between the stator 141 of the rotary transformer 14 and the motor controller 13 short. For the powertrain 10 in which the motor controller 13, the reducer, and the drive motor 11 are arranged along the axial direction O of the powertrain 10, the rotary transformer 14 is arranged at the end of the motor shaft 111 away from the reducer 12. The signal harness 144 of the rotary transformer 14 needs to pass through the motor housing 100 and the reducer housing 200 in sequence to reach the electrical control of the reducer end cover 300, making the signal harness 144 relatively long. It is necessary to consider avoiding the stator 113, rotor, and gear assembly of the drive motor 11 and the reducer 12, making the arrangement of the signal harness 144 more complicated. In this embodiment, an electrical control slot 308 is formed on the side of the reducer end cover 300 away from the motor shaft 111 to accommodate the motor controller 13. The rotor 142 of the rotary transformer 14 is arranged at one end 151 of the oil guide pipe 15 in the input shaft 121 of the reducer. This makes the distance between the rotary transformer 14 and the electrical control slot 308 closer, so that the signal harness 144 of the rotary transformer 14 can be connected to the motor controller 13 of the electrical control slot 308 with a shorter path. This makes the arrangement of the signal harness 144 of the rotary transformer 14 simpler and saves costs.

[0108] In one embodiment, such as Figure 11 As shown, the through hole 302 penetrates the axial groove wall 3081 of the electrical control groove 308, as... Figure 9 and Figure 10As shown, the sealing plate 305 is housed within the electrical control slot 308 and fixed to the axial slot wall 3081 of the electrical control slot 308. The grooves 304 for accommodating the signal harness 144 of the rotary transformer 14 are distributed at the slot opening of the electrical control slot 308, and the slot openings of the grooves 304 face the same direction as the slot openings of the electrical control slot 308. The signal harness 144 of the rotary transformer 14 is housed within the grooves 304 located in the axial slot wall 3081 of the electrical control slot 308, and passes through the outlet hole 3051 of the sealing plate 305 housed in the electrical control slot 308 to connect to the motor controller 13 of the electrical control slot 308. This arrangement of the rotary transformer 14 reduces the axial dimension of the powertrain 10 while also reducing the length of the signal harness 144 of the rotary transformer 14.

[0109] In one embodiment, the oil guide pipe 15 is a metal oil guide pipe 15, and the metal oil guide pipe 15 is interference-fitted with the rotor 142 of the rotary transformer 14.

[0110] The rotor 142 of the rotary transformer 14 is generally made of metal, and the input shaft 121 of the reducer 12 is generally made of metal. Since the oil guide pipe 15 needs to be fixed to the input shaft 121 to rotate with the input shaft 121 and to fix the rotor 142 of the rotary transformer 14, in this embodiment of the application, the oil guide pipe 15 is a metal oil guide pipe 15, so that the oil guide pipe 15 can be interference-fitted with the rotor 142 of the rotary transformer 14 to achieve stable fixation, and the oil guide pipe 15 can be interference-fitted with the input shaft 121 to achieve stable fixation, thereby improving the detection accuracy and detection stability of the rotary transformer 14.

[0111] The powertrain and electric vehicle provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and embodiments of this application. The description of the embodiments above is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in specific embodiments and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A powertrain, characterized in that, The reducer end cover of the powertrain is used to fix the outer ring of the bearing on the input shaft of the reducer. The end of the input shaft opposite to the reducer end cover is used to couple the motor shaft of the drive motor. The inner cavity of the input shaft is used to fix and accommodate one end of the oil guide pipe. The oil guide pipe is used to deliver the oil output from the reducer end cover to the motor shaft, wherein: The other end of the oil guide pipe extends out of the inner cavity of the input shaft, and the other end of the oil guide pipe is used to fix the rotor of the rotary transformer. The stator of the rotary transformer is fixed to the reducer end cover.

2. The powertrain according to claim 1, characterized in that, The other end of the oil guide pipe includes a first section and a second section, the second section being arranged between the first section and one end of the oil guide pipe. The first section is used to fix the rotor of the rotary transformer, the outer diameter of the second section is larger than the outer diameter of the first section, and the second section is used to abut against the rotor of the rotary transformer along the axial direction of the input shaft.

3. The powertrain according to claim 2, characterized in that, The outer diameter of the second segment is larger than the inner diameter of the input shaft, and the axial end face of the second segment away from the first segment is used to abut against the axial end face of the input shaft along the axial direction.

4. The powertrain according to claim 3, characterized in that, A portion of the stator of the rotary transformer surrounds the outer periphery of the second segment, and the length of the second segment along the axial direction of the input shaft is greater than the length of the portion of the stator of the rotary transformer.

5. The powertrain according to any one of claims 1-4, characterized in that, The reducer end cover includes a bearing groove and a through hole. The peripheral wall of the bearing groove is used to fix the outer ring of the bearing on the input shaft. The opening of the bearing groove faces one end of the input shaft. The through hole penetrates the bottom of the bearing groove along the axial direction of the input shaft. The through hole is used to accommodate at least a portion of the rotor and at least a portion of the stator of the rotary transformer, and the wall of the through hole is used to fix the stator of the rotary transformer.

6. The powertrain according to claim 5, characterized in that, The through hole includes a fixed section and an abutment section. The fixed section is arranged on the side of the abutment section away from the groove opening of the bearing groove. The inner diameter of the fixed section is larger than the inner diameter of the abutment section. The stator of the rotary transformer includes a protrusion protruding away from the rotor of the rotary transformer. The fixed section is used to fix the protrusion. The end face of the abutment section facing the fixed section is used to abut the protrusion along the axial direction of the input shaft.

7. The powertrain according to claim 5, characterized in that, The bearing groove is also used to accommodate gaskets, which are arranged along the axial direction of the input shaft between the stator of the rotary transformer and the outer ring or inner ring of the bearing.

8. The powertrain according to claim 5, characterized in that, The diameter of the through hole is larger than the inner diameter of the input shaft, and the diameter of the through hole is smaller than the inner diameter of the outer ring of the bearing.

9. The powertrain according to any one of claims 5-8, characterized in that, The reducer end cover also includes a cable outlet groove for accommodating the signal connector of the rotary transformer. The signal connector is used to connect the signal harness of the rotary transformer, wherein: The opening of the cable outlet groove is axially away from one end of the input shaft along the powertrain, and the cable outlet groove penetrates the wall of the through hole radially along the powertrain.

10. The powertrain according to any one of claims 5-9, characterized in that, The reducer end cover also includes a groove for accommodating the signal harness of the rotary transformer, wherein: The groove opening is axially away from one end of the input shaft along the powertrain, and the groove is radially distributed on the outer periphery of the through hole and the bearing groove of the powertrain.

11. The powertrain according to claim 10, characterized in that, The reducer end cover also includes a sealing plate, which covers the slot of the through hole and the groove. The sealing plate includes a wire outlet hole that extends through the sealing plate along the axial direction of the powertrain. The wire outlet hole is used to pass through the signal harness of the rotary transformer. The wire outlet hole and the groove are opposite to each other along the axial direction of the powertrain.

12. The powertrain according to any one of claims 5-11, characterized in that, The reducer end cover also includes an oil outlet protrusion, which is used to deliver the oil transmitted by the reducer end cover to the oil guide pipe, wherein: The oil outlet protrusion extends into the oil guide pipe, and the oil outlet protrusion, the rotor of the rotary transformer, and the hole wall of the through hole are at least partially stacked along the radial direction of the input shaft.

13. The powertrain according to any one of claims 1-12, characterized in that, The reducer end cover also includes an electrical control groove, the groove opening of which is away from the end of the input shaft. The electrical control groove is used to accommodate the functional components of the motor controller. The rotary transformer is used to electrically connect the functional components of the motor controller. The stator of the rotary transformer is fixed to the axial groove wall of the electrical control groove.

14. The powertrain according to any one of claims 1-13, characterized in that, The oil guide pipe is a metal oil guide pipe, and the metal oil guide pipe is interference-fitted with the rotor of the rotary transformer.

15. An electric vehicle, characterized in that, The electric vehicle includes a powertrain as described in any one of claims 1-14, wherein the drive motor of the powertrain drives the wheels via a reducer.

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