Extended-range power assembly and extended-range electric vehicle

Abstract

The utility model provides an extended-range power assembly and an extended-range electric vehicle. A shell of the extended-range power assembly comprises a motor cavity, a generator cavity, a gear cavity, a bearing cavity, a bearing chamber and two oil outlet holes. The gear cavity is used for containing two gear sets, and the two gear sets are in transmission connection with the generator and the motor correspondingly. The bearing cavity and the bearing chamber are used for fixing outer rings of the two bearings respectively, inner rings of the two bearings are used for fixing the outer circumferential face of the hollow gear shaft, and an inner spline on the inner circumferential face of the hollow gear shaft is used for being coupled with an outer spline of a coupling section of the motor shaft. The two oil outlet holes are distributed in the groove bottoms of the bearing chambers, and the distance between the axis of one oil outlet hole and the axis of one bearing chamber is smaller than the radius of the inner circumferential face of the gear shaft and larger than the radius of the outer circumferential face of the motor shaft. Thus, lubricating oil output by the oil outlet hole can flow into the gap between the inner circumferential face of the gear shaft and the outer circumferential face of the motor shaft, and then the meshing position of the inner spline and the outer spline can be lubricated.

Description

Technical Field

[0001] The present disclosure relates to the field of extended-range electric vehicles, and in particular to an extended-range powertrain and an extended-range electric vehicle. Background Art

[0002] The extended-range powertrain includes a generator, an electric motor and a gearbox. The motor shaft of the generator or electric motor and the gear shaft of the gearbox are splined to transmit power. For example, the gear shaft is a hollow shaft, and the inner circumference of the gear shaft has an internal spline. The motor shaft has an external spline, which extends into the interior of the gear shaft, and the external spline meshes with the internal spline. In order to reduce the wear and abnormal noise between the internal spline and the external spline, the meshing point of the internal spline and the external spline needs to be lubricated. Utility Model Content

[0003] The present disclosure provides an extended-range powertrain and an extended-range electric vehicle, which can effectively lubricate the internal splines of a gear shaft and the external splines of a motor shaft.

[0004] In a first aspect, the present disclosure provides an extended-range powertrain, wherein a housing of the extended-range powertrain comprises a motor cavity, a generator cavity, a gear cavity, a bearing cavity, a bearing chamber, and two oil outlet holes.

[0005] The one motor cavity and the one generator cavity are arranged in parallel, the one motor cavity is used to fix the stator of an electric motor, the one generator cavity is used to fix the stator of a generator, and the one generator is used to charge the power battery of the vehicle.

[0006] The gear chamber is used to accommodate two sets of gear sets, one set of the gear sets is used to drive and connect an engine and a generator, and the electric motor drives the wheels of the vehicle through another set of the gear sets.

[0007] The bearing cavity and the bearing chamber are respectively used to fix the outer rings of the two bearings, the inner rings of the two bearings are used to fix the outer circumference of a hollow gear shaft in any group of the gear sets, the hollow gear shaft is used to accommodate a coupling section of a hollow motor shaft of the generator or the motor, and the internal splines on the inner circumference of the hollow gear shaft are used to couple the external splines of the coupling section of the hollow motor shaft.

[0008] The two oil outlet holes are distributed at the groove bottom of the bearing chamber, and the two oil outlet holes are used to output the lubricating oil transmitted by an internal oil channel of the housing. The aperture of one oil outlet hole is larger than the aperture of the other oil outlet hole, and the distance between the axis of the one oil outlet hole and the axis of the bearing chamber is smaller than the distance between the axis of the other oil outlet hole and the axis of the bearing chamber, and the distance between the axis of the other oil outlet hole and the axis of the bearing chamber is smaller than the radius of the inner circumference of the hollow gear shaft and larger than the radius of the outer circumference of the hollow motor shaft.

[0009] The technical solution provided by the present disclosure is that, since the distance between the axis of the other oil outlet hole and the axis of the one bearing chamber is smaller than the radius of the inner circumference of the one hollow gear shaft and larger than the radius of the outer circumference of the one hollow motor shaft, the other oil outlet hole is relative to the gap between the inner circumference of the gear shaft and the outer circumference of the motor shaft, so that the lubricating oil output by the oil outlet hole can flow into the gap and then flow into the meshing part of the inner spline and the outer spline. In this way, the amount of lubricating oil at the meshing part of the inner spline and the outer spline is large, which improves the lubrication effect of the meshing part of the inner spline and the outer spline. In addition, the distance between the axis of the one oil outlet hole and the axis of the one bearing chamber is smaller than the distance between the axis of the other oil outlet hole and the axis of the one bearing chamber, and the one oil outlet hole is used to output lubricating oil to the inside of the hollow motor shaft and can cool the motor shaft. Furthermore, since the aperture of the one oil outlet hole is larger than that of the other oil outlet hole, the oil output of the one oil outlet hole is larger than that of the other oil outlet hole, which is more in line with actual lubrication and cooling requirements.

[0010] In one implementation, the groove bottom of the bearing chamber includes a boss, and the end surface of the boss facing the motor shaft includes an opening of the oil outlet hole. The boss is used to extend into the shaft cavity of the motor shaft so that the oil outlet hole can output lubricating oil to the interior of the hollow motor shaft.

[0011] In one implementation, the bearing chamber includes two connected cavities, the two cavities are arranged along the axial direction of the one gear shaft, the inner diameter of one cavity is smaller than the inner diameter of the other cavity, the other cavity is used to fix the outer ring of the bearing and to accommodate the insertion of at least one of the one motor shaft or the one gear shaft, the length of the other cavity along the axial direction of the one gear shaft is greater than the length of the one cavity, and the length of the one boss along the axial direction of the one gear shaft is greater than the length of the one cavity. Since the length of the one boss is greater than the length of the one cavity, the one boss extends into the interior of the other cavity and then into the hollow motor shaft.

[0012] In one implementation, the groove bottom of the bearing chamber includes another boss, the end surface of the other boss facing the motor shaft includes the opening of the other oil outlet hole, and the length of the other boss along the axial direction of the gear shaft is smaller than the length of the one boss.

[0013] In one implementation, the length of the other boss is smaller than the length of the one cavity.

[0014] The technical solution provided by the present disclosure is that, since the length of the other boss is smaller than the length of the one cavity, the other boss will not extend into the other cavity and will not interfere with the rotation of the gear shaft and the motor shaft. In addition, the other boss can reduce the distance between the opening of the other oil outlet hole and the end of the gear shaft, so that the lubricating oil output from the other oil outlet hole flows into the gap between the inner circumference of the gear shaft and the outer circumference of the motor shaft.

[0015] In one implementation, the other oil outlet hole includes two hole segments, the distance between one hole segment and the one gear shaft is greater than the distance between the other hole segment and the one gear shaft, and the aperture of the one hole segment is smaller than the aperture of the other hole segment and smaller than the aperture of the one oil outlet hole. In this way, the oil output of the one oil outlet hole is greater than the oil output of the other oil outlet hole, which better meets the actual lubrication and cooling requirements.

[0016] In one implementation, the inner circumferential surface of the gear shaft includes two smooth sections and an internal spline section, and the two smooth sections are distributed on both sides of the internal spline section along the axial direction of the gear shaft. The inner circumferential surface of the internal spline section includes the internal spline, and the distance between the axis of the other oil outlet hole and the axis of the bearing chamber is smaller than the radius of the inner circumferential surface of any of the smooth sections.

[0017] The technical solution provided by the present disclosure is that since the internal spline and the external spline need to mesh, the gap between the internal spline segment and the external spline segment is small. If the internal spline segment is located at the end, the oil inlet of the gap between the inner circumference of the gear shaft and the outer circumference of the motor shaft will be small, making it difficult for the lubricating oil to enter the gap. By adopting the above technical solution, the gap between the inner circumference of the smooth section and the outer circumference of the motor shaft is located at the oil inlet, thereby making the oil inlet of the gap larger, and the lubricating oil output from the oil outlet hole is easier to enter the gap, thereby increasing the amount of lubricating oil entering the gap.

[0018] In one implementation, the gear shaft includes two end faces, the two end faces are opposite to each other in the radial direction of the gear shaft, each end face includes an opening, each opening is used to connect to one of the smooth sections, and the aperture of each opening is larger than the inner diameter of any of the smooth sections. Since the aperture of the opening is larger than the aperture of the smooth section, the gap between the inner wall of the opening and the outer peripheral surface of the motor shaft is larger, which is conducive to the inflow of lubricating oil.

[0019] In one implementation, the motor shaft includes a first shaft segment, a second shaft segment, and a third shaft segment arranged along the axial direction of the motor shaft. The outer diameter of the first shaft segment is smaller than the outer diameter of the second shaft segment, and the outer diameter of the second shaft segment is smaller than the outer diameter of the third shaft segment. The first shaft segment is used to extend into the interior of the gear shaft, and the length of the first shaft segment along the axial direction of the motor shaft is greater than the length of the gear shaft. The second shaft segment is used to fix the inner ring of a bearing of the motor shaft. The third shaft segment is used to fix the electronic rotor of the generator or the motor. The length of the first shaft segment is greater than the length of the second shaft segment and less than the length of the third shaft segment, and the inner diameter of the first shaft segment is less than or equal to the inner diameter of at least one of the second shaft segment or the third shaft segment.

[0020] In one implementation, the first shaft segment includes two optical shaft segments and a spline segment. The outer peripheral surface of the spline segment includes the outer spline. The two optical shaft segments are distributed on both sides of the spline segment along the axial direction of the first shaft segment. One optical shaft segment extends into the bearing chamber, and the other optical shaft segment includes a plurality of drainage holes, which are arranged at intervals along the circumference of the other optical shaft segment, and each drainage hole is connected to the inner peripheral surface and the outer peripheral surface of the first shaft segment along the radial direction of the first shaft segment.

[0021] The technical solution provided by the present invention is that the lubricating oil entering the gap between the inner circumference of the gear shaft and the outer circumference of the motor shaft first lubricates the meshing point of the inner spline and the outer spline, then flows into the interior of the motor shaft through the drainage hole, and flows out together with the lubricating oil inside the motor shaft.

[0022] In one implementation, a gap between an outer circumferential surface of the optical axis segment and an inner circumferential surface of the gear shaft is larger than a gap between the spline segment and the inner circumferential surface of the gear shaft.

[0023] In one implementation, the outer diameter of the second shaft segment is greater than the outer diameter of the gear shaft, and the gap between the second shaft segment and the gear shaft along the axial direction of the motor shaft is greater than the aperture of each of the drainage holes.

[0024] In one implementation, the third shaft segment includes a plurality of liquid outlet holes, and the plurality of liquid outlet holes are arranged at intervals along the circumference of the third shaft segment, each of the liquid outlet holes is connected to the inner circumference and the outer circumference of the third shaft segment along the radial direction of the third shaft segment, and the aperture of each of the liquid outlet holes is larger than the aperture of each of the drainage holes.

[0025] The technical solution provided by the present invention is that the lubricating oil inside the motor shaft can flow out through the liquid outlet, and the lubricating oil flowing out of the liquid outlet can cool the motor rotor. In addition, in the case where the motor shaft also includes a drainage hole, since the drainage hole is located in the first shaft segment, the liquid outlet is located in the third shaft segment, and the outer diameter of the first shaft segment is smaller than the outer diameter of the third shaft segment, the centrifugal force on the gas in the liquid outlet is greater than the centrifugal force on the gas in the drainage hole, so that the gas will flow along the drainage hole, the inside of the motor shaft and the liquid outlet in sequence.

[0026] Under the action of the airflow, the lubricating oil flows into the gap between the inner circumference of the gear shaft and the outer circumference of the first shaft section of the motor shaft, and then flows through and lubricates the meshing of the inner spline and the outer spline. Then, the lubricating oil flows into the inside of the motor shaft through the drainage hole. Then, the lubricating oil inside the motor shaft flows out through the liquid outlet hole and lubricates the motor rotor. Under the action of centrifugal force, the flow speed of the lubricating oil flowing through the meshing of the inner spline and the outer spline is faster, thereby further improving the lubrication effect on the meshing of the inner spline and the outer spline.

[0027] In one implementation, along the radial direction of the motor shaft, the length of each liquid outlet hole is greater than the length of each drainage hole; along the axial direction of the motor shaft, the distance between each liquid outlet hole and the end face of the second shaft segment is greater than the distance between each drainage hole and the end face of the second shaft segment.

[0028] In one implementation, the housing includes two parts, the gear cavity is formed between the two parts, one part includes the motor cavity, the generator cavity and the bearing cavity, and the other part includes the bearing chamber and the two oil outlet holes.

[0029] In a second aspect, the present disclosure provides an extended-range electric vehicle, wherein the extended-range electric vehicle comprises an extended-range powertrain as described in any one of the first aspects. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic diagram of an extended-range powertrain provided by an embodiment of the present disclosure;

[0031] Figure 2 is a schematic diagram of an extended-range powertrain provided by an embodiment of the present disclosure;

[0032] Figure 3is a schematic diagram of a gear set inside a range-extended powertrain provided in an embodiment of the present disclosure;

[0033] Figure 4 is a partial schematic diagram of a housing of an extended-range powertrain provided in an embodiment of the present disclosure;

[0034] Figure 5 The embodiment of the present disclosure provides Figure 4 A partial enlarged view of the framed portion;

[0035] Figure 6 is a cross-sectional view of a housing of an extended-range powertrain provided in an embodiment of the present disclosure;

[0036] Figure 7 is a cross-sectional view of an extended-range powertrain provided by an embodiment of the present disclosure;

[0037] Figure 8 The embodiment of the present disclosure provides Figure 7 A partial enlarged view of the framed portion;

[0038] Fig. 9 is a three-dimensional schematic diagram of an extended-range powertrain provided by an embodiment of the present disclosure;

[0039] Fig.10 The embodiment of the present disclosure provides Fig. 9 A partial enlarged view of the framed portion;

[0040] Fig.11 is a schematic diagram of a gear shaft and a motor shaft provided in an embodiment of the present disclosure;

[0041] Fig.12 is a schematic diagram of the internal structure of a gear shaft provided by an embodiment of the present disclosure;

[0042] Fig.13 is a schematic diagram of the internal structure of a gear shaft and a motor shaft provided in an embodiment of the present disclosure;

[0043] Fig.14 is a schematic diagram of a flow path of lubricating oil on a gear shaft and a motor shaft provided by an embodiment of the present disclosure;

[0044] Fig.15 It is a schematic diagram of another flow path of lubricating oil on a gear shaft and a motor shaft provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0045] Spline connection is a common power connection method in the extended-range powertrain. The extended-range powertrain includes a generator, an electric motor and a gearbox. The motor shaft of the generator or the electric motor and the gear shaft of the gearbox are connected by spline connection to transmit power. For example, the gear shaft is a hollow shaft, and the inner circumference of the gear shaft has internal splines. The motor shaft has external splines, and the motor shaft extends into the interior of the gear shaft, and the external splines are meshed with the internal splines. In this way, power transmission between the motor shaft and the gear shaft is achieved. Among them, the gear shaft refers to a rotating shaft with a gear fixed thereon, and the gear and the rotating shaft can be connected by a key or in an integrated manner.

[0046] During the synchronous rotation of the motor shaft and the gear shaft, the inner spline and the outer spline will wear and even make abnormal noise. In order to reduce the wear and abnormal noise between the inner spline and the outer spline, the meshing part of the inner spline and the outer spline needs to be lubricated.

[0047] In the related art, the meshing parts of the inner splines and the outer splines are generally lubricated by splash lubrication. Lubricating oil is accumulated in the gearbox, and the gears of the gearbox stir the lubricating oil when they rotate, causing the lubricating oil to splash to the meshing parts of the inner splines and the outer splines. However, the splash lubrication method has the problem that the amount of lubricating oil entering the meshing parts of the inner splines and the outer splines is small, and the lubrication effect is poor. Poor lubrication effect can easily cause abnormal wear of the splines and rapid heating of the motor shaft and other faults. Furthermore, abnormal wear of the splines can cause abnormal noises in the entire vehicle and even power interruption. The rapid heating of the motor shaft will accelerate the aging of the plastic seals, causing the motor seal to fail, thereby causing functional safety failures such as motor short circuit and fire, affecting the life safety of the driver and passengers.

[0048] In view of the above technical problems, the embodiment of the present disclosure provides an extended-range powertrain. The housing 1 of the extended-range powertrain includes a motor chamber 11, a generator chamber 12, a gear chamber 13, a bearing chamber 123, a bearing chamber 131 and two oil outlet holes (101, 102).

[0049] like Figure 1 As shown, the motor cavity 11 and the generator cavity 12 are arranged in parallel. The motor cavity 11 is used to fix the stator of the motor. The generator cavity 12 is used to fix the stator of the generator. In the embodiment of the present application, the generator is used to charge the power battery of the vehicle.

[0050] like Figure 2-Figure 4 As shown, the housing 1 includes two parts. Figure 2 The housing 1 is shown to include two parts, Figure 3 A part of the housing 1 is shown. Figure 4The figure shows a part of another part of the housing 1. A gear chamber 13 is formed between the two parts, one part includes a motor chamber 11, a generator chamber 12 and a bearing chamber 132, and the other part includes a bearing chamber 131 and two oil outlets (101, 102).

[0051] Combination Figure 1 and Figure 2 As shown, the rotor 22 of the generator can receive drive from an engine via the motor shaft 21 of the generator and an input shaft 31 .

[0052] like Figure 3 As shown, the gear chamber 13 is used to accommodate two gear sets. The two gear sets are respectively gear set 3 and gear set 4. Among them, gear set 3 is used for transmission connection between the engine and the generator 2, and the motor drives the wheels of the vehicle through the gear set 4.

[0053] Combination Figure 2 and Figure 3 As shown, the gear set 3 includes an input shaft 31 and an output shaft 32. The input shaft 31 is used for transmission connection with an engine, and the output shaft 32 is used for transmission connection with the motor shaft 21 of the generator.

[0054] Combination Figure 2 and Figure 3 As shown, the gear set 4 includes an input shaft 41, an intermediate shaft 42 and an output shaft 43. The input shaft 41 is used for driving connection with the motor shaft of the electric motor, and the output shaft 43 is used for driving the wheels of the vehicle through a differential.

[0055] In the embodiment of the present application, the bearing cavity 132 and the bearing chamber 131 are respectively used to fix the outer rings of the two bearings, the inner rings of the two bearings are used to fix the outer circumference of a hollow gear shaft in any group of gear sets, the hollow gear shaft is used to accommodate a hollow coupling section of a motor shaft, and the internal splines on the inner circumference of the hollow gear shaft are used to couple the external splines of the coupling section of the motor shaft.

[0056] In the embodiment of the present application, the gear shaft may be the output shaft 32 in the gear set 3 or the input shaft 41 in the gear set 4. The motor shaft may be the motor shaft of a generator or a motor. Figure 7 As shown, the bearing cavity 132 and the bearing chamber 131 respectively fix the outer rings of the two bearings of the output shaft 32 in the gear set 3, and the output shaft 32 in the gear set 3 is used to accommodate the motor shaft 21 of the generator. In one embodiment, the bearing cavity 132 and the bearing chamber 131 respectively fix the outer rings of the two bearings of the input shaft 41 in the gear set 4, and the input shaft 41 in the gear set 4 is used to accommodate the motor shaft of the motor.

[0057] In the drawings of the embodiments of the present disclosure, the gear shaft is shown as the output shaft 32 of the gear set 3, and the motor shaft is the motor shaft 21 of the generator 2. In other examples, the gear shaft may also be the input shaft 41 of the gear set 4, and the motor shaft may also be the motor shaft of the motor.

[0058] like Figure 4-Figure 10 As shown, the two oil outlet holes (101, 102) are oil outlet hole 101 and oil outlet hole 102 respectively. The oil outlet hole 101 and the oil outlet hole 102 are distributed at the bottom of the groove of the bearing chamber 131, and the two oil outlet holes are used to output the lubricating oil transmitted by an internal oil passage 10 of the housing. The aperture of the oil outlet hole 101 is larger than the aperture of the oil outlet hole 102. The distance between the axis of the oil outlet hole 101 and the axis of the bearing chamber 131 is smaller than the distance d between the axis of the oil outlet hole 102 and the axis of the bearing chamber 131. The distance d between the axis of the oil outlet hole 102 and the axis of the bearing chamber 131 is smaller than the radius R of the inner circumference of the gear shaft (such as the output shaft 32) and larger than the radius r of the outer circumference of the motor shaft 21.

[0059] The technical solution provided by the embodiment of the present disclosure is that since the oil outlet hole 102 is distributed at the bottom of the groove of the bearing chamber 131, the distance d between the axis of the oil outlet hole 102 and the axis of the bearing chamber 131 is smaller than the radius R of the inner circumference of the gear shaft and larger than the radius r of the outer circumference of the motor shaft 21, the oil outlet hole 102 is opposite to the gap between the inner circumference of the gear shaft and the outer circumference of the motor shaft 21, so that the lubricating oil output by the oil outlet hole 102 can flow into the gap and then flow into the meshing of the inner spline and the outer spline. In this way, the amount of lubricating oil at the meshing of the inner spline and the outer spline is large, which improves the lubrication effect at the meshing of the inner spline and the outer spline.

[0060] In addition, the distance between the axis of the oil outlet hole 101 and the axis of the bearing chamber 131 is smaller than the distance d between the axis of the oil outlet hole 102 and the axis of the bearing chamber 131. The oil outlet hole 101 is used to output lubricating oil to the inside of the hollow motor shaft 21, so the motor shaft 21 can be cooled. Moreover, the aperture of the oil outlet hole 101 is larger than the aperture of the oil outlet hole 102, so that the oil output of the oil outlet hole 101 is greater than the oil output of the oil outlet hole 102, which is more in line with the actual lubrication and cooling requirements. Furthermore, the improvement of the above-mentioned lubrication effect and cooling effect reduces the possibility of abnormal wear of the spline and rapid heating of the motor shaft 21, and reduces the possibility of abnormal noise of the whole vehicle, power interruption, motor short circuit and fire.

[0061] like Figure 7 and Figure 8 As shown, the distance between the axis of the oil outlet hole 101 and the axis of the bearing chamber 131 is smaller than the radius of the inner circumference of the motor shaft 21 , thereby ensuring that the lubricating oil output from the oil outlet hole 101 can flow into the interior of the motor shaft 21 .

[0062] like Figure 7 and Figure 8 As shown, the axis of the oil outlet hole 101 coincides with the axis of the bearing chamber 131 .

[0063] like Figure 6-Figure 8 As shown, an internal oil passage 10 is integrated in the housing 1, and two oil outlet holes are connected to the internal oil passage 10. The housing 1 can be integrally injection molded. In this way, parts such as an oil injection nozzle and a sealing ring can be saved.

[0064] like Figure 4-Figure 10 As shown, the groove bottom of the bearing chamber 131 includes a boss 104, and the end surface of the boss 104 facing the motor shaft 21 includes an opening of the oil outlet hole 101. The boss 104 is used to extend into the shaft cavity of the motor shaft 21. In this way, the oil outlet hole 101 can directly output lubricating oil to the inside of the motor shaft 21.

[0065] like Figure 5-Figure 8 As shown, the bearing chamber 131 includes two connected cavities, and the two cavities are arranged along the axial direction of the gear shaft. The two cavities are cavity 1311 and cavity 1312, and the inner diameter of cavity 1311 is smaller than the inner diameter of cavity 1312. Cavity 1312 is used to fix the outer ring of the bearing and to accommodate the insertion of at least one of the motor shaft 21 or the gear shaft. Along the axial direction of the gear shaft, the length of cavity 1312 is greater than the length of cavity 1311. Along the axial direction of the gear shaft, the length of boss 104 is greater than the length of cavity 1311, so that boss 104 can extend into the interior of cavity 1312, and then can extend into the shaft cavity of motor shaft 21.

[0066] like Figure 5 and Figure 6 As shown, the groove bottom of the bearing chamber 131 also includes a boss 1310, and the end face of the boss 1310 facing the motor shaft 21 includes an opening of the oil outlet hole 102. Along the axial direction of the gear shaft, the length of the boss 1310 is less than the length of the boss 104. Further, the length of the boss 1310 is less than the length of the cavity 1311. In this way, on the one hand, the boss 1310 does not extend into the interior of the cavity 1312, so that the boss 1310 will not contact the ends of the motor shaft 21 and the gear shaft, and will not affect the rotation of the motor shaft 21 and the gear shaft. On the other hand, the boss 1310 reduces the distance between the opening of the oil outlet hole 102 and the end faces of the motor shaft 21 and the gear shaft, so as to facilitate the lubricating oil output from the oil outlet hole 102 to enter the gap between the inner circumference of the gear shaft and the outer circumference of the motor shaft 21.

[0067] like Figure 6As shown, the oil outlet hole 102 includes two hole sections, namely hole section 1021 and hole section 1022. The distance between hole section 1021 and the gear shaft is greater than the distance between hole section 1022 and the gear shaft. The hole diameter of hole section 1021 is smaller than the hole diameter of hole section 1022 and smaller than the hole diameter of oil outlet hole 101. In this way, the oil output of oil outlet hole 102 can be controlled to be smaller than the oil output of oil outlet hole 101, which is more in line with actual lubrication and cooling requirements.

[0068] like Figure 6 As shown, the groove bottom of the cavity 1311 also includes an oil outlet hole 103, which is connected to the internal oil channel 10 of the shell 1. The oil outlet hole 103 is used to output lubricating oil to the cavity 1311 to lubricate the bearing fixed in the cavity 1312.

[0069] like Figure 7-10 As shown, the ends of the motor shaft 21 and the gear shaft are both extended into the interior of the bearing chamber 131. In this way, the distance between the opening of the oil outlet hole 102 and the ends of the gear shaft and the motor shaft 21 is reduced, which is conducive to the lubricating oil output from the oil outlet hole 102 flowing into the gap between the inner circumference of the gear shaft and the outer circumference of the motor shaft 21.

[0070] like Fig.12 As shown, the gear shaft includes two smooth sections arranged in the axial direction and an inner spline section 322. The inner circumference of the inner spline section 322 includes an inner spline. The two smooth sections are a smooth section 321 and a smooth section 323, and the smooth section 321 and the smooth section 323 are distributed on both sides of the inner spline section 322. Among them, the distance d between the axis of the oil outlet hole 102 and the axis of the bearing chamber 131 is smaller than the radius R of the inner circumference of the smooth section 321, and is also smaller than the radius of the inner circumference of the smooth section 323.

[0071] like Fig.12 As shown, the gear shaft includes two end faces, which are opposite to each other in the radial direction of the gear shaft. Each end face includes an opening, each opening is used to connect a smooth section, and the aperture of each opening is larger than the inner diameter of any smooth section. Fig.12 As shown, the two openings are opening 3210 and opening 3230 respectively. Since the aperture of the opening is larger than the aperture of the smooth section 321, the gap between the opening and the outer circumference of the motor shaft 21 is larger, which is conducive to the lubricating oil output from the oil outlet 102 flowing into the gap between the inner circumference of the gear shaft and the outer circumference of the motor shaft 21 at the oil inlet.

[0072] like Fig.11As shown, the motor shaft 21 includes a first shaft section 211, a second shaft section 212 and a third shaft section 213 arranged in the axial direction. The outer diameter of the first shaft section 211 is smaller than the outer diameter of the second shaft section 212, and the outer diameter of the second shaft section 212 is smaller than the outer diameter of the third shaft section 213. The first shaft section 211 is used to extend into the interior of the gear shaft, the second shaft section 212 is used to fix the inner ring of a bearing of the motor shaft, and the third shaft section 213 is used to fix the motor rotor 22 (such as a generator or a motor) of the motor. Figure 8 In some examples, the length of the first shaft segment 211 is greater than the length of the second shaft segment 212 and less than the length of the third shaft segment 213. The inner diameter of the first shaft segment 211 is less than or equal to the inner diameter of at least one of the second shaft segment 212 or the third shaft segment 213.

[0073] like Fig.11 As shown, the length of the first shaft section 211 along the axial direction of the motor shaft 21 is greater than the length of a gear shaft, and there is a gap between the second shaft section 212 and the gear shaft.

[0074] like Fig.11 As shown, the first shaft section 211 includes two optical shaft sections and a spline section 2112. The outer peripheral surface of the spline section 2112 includes an external spline. The two optical shaft sections are optical shaft section 2111 and optical shaft section 2113, respectively, and the optical shaft section 2111 and the optical shaft section 2133 are distributed on both sides of the spline section 2112. The optical shaft section 2111 extends into the bearing chamber 131.

[0075] like Fig.13 As shown, the smooth section 321 surrounds the optical axis section 2111, the inner spline section 322 surrounds the outer spline section 2112, and the smooth section 232 surrounds the optical axis section 2133. Among them, the gap between the inner circumference of the smooth section 321 and the outer circumference of the optical axis section 2111 is larger than the gap between the inner circumference of the inner spline section 322 and the outer circumference of the outer spline section 2112. In this way, compared with setting the inner spline section 322 and the outer spline section 2112 at the end, the oil inlet of the gap 3200 is larger, so that the lubricating oil output from the oil outlet hole 102 can flow into the gap 3200 more easily, thereby increasing the amount of lubricating oil flowing into the meshing part of the inner spline and the outer spline.

[0076] The gap between the inner circumference of the smooth segment 321 and the outer circumference of the optical axis segment 2111 is smaller than the gap between the inner circumference of the smooth segment 323 and the outer circumference of the optical axis segment 2113 .

[0077] like Fig.11 , Fig.13 and Fig.14 As shown, the optical axis segment 2113 includes a plurality of drainage holes 2114 , which are arranged at intervals along the circumference of the optical axis segment 2113 , and each drainage hole 2114 connects the inner circumference and the outer circumference of the optical axis segment 2113 along the radial direction of the optical axis segment 2113 .

[0078] like Fig.14 As shown, the lubricating oil outputted from the oil outlet 102 first enters the gap 3200 between the inner circumference of the gear shaft and the outer circumference of the motor shaft 21, then flows through the meshing of the inner spline and the outer spline, and then flows into the interior of the motor shaft 21 through the drainage hole 2114, and flows along with the lubricating oil inside the motor shaft 21. Among them, since the drainage hole 2114 is located in the optical axis section 2113, it is ensured that the lubricating oil flows through the meshing of the inner spline and the outer spline before flowing into the interior of the motor shaft 21.

[0079] like Fig.13 As shown, there are two drainage holes 2114 , and the two drainage holes 2114 are arranged opposite to each other.

[0080] like Fig.15 As shown, the first shaft segment 211 is not provided with the drainage hole 2114 .

[0081] like Fig.15 As shown, there is a gap between the second shaft section 212 and the gear shaft along the axial direction of the motor shaft 21. The lubricating oil in the gap 3200 can flow out through the gap between the second shaft section 212 and the gear shaft.

[0082] The gap between the second shaft section 212 and the gear shaft along the axial direction of the motor shaft 21 is larger than the aperture of each drainage hole 2114 .

[0083] like Fig.15 As shown, the outer diameter of the second shaft section 212 is greater than the outer diameter of the gear shaft.

[0084] like Fig.11 , Fig.13 and Fig.14 As shown, the third shaft segment 213 includes a plurality of liquid outlet holes 2130 , which are arranged at intervals along the circumference of the third shaft segment 213 , and each liquid outlet hole 2130 connects the inner circumference and the outer circumference of the third shaft segment 213 along the radial direction of the third shaft segment 213 .

[0085] The technical solution provided by the embodiment of the present disclosure is that the lubricating oil inside the motor shaft 21 can flow out through the liquid outlet 2130, and the lubricating oil flowing out of the liquid outlet 2130 can cool the motor rotor 22. In addition, in the case where the motor shaft 21 also includes the drainage hole 2114, such as Fig.14 As shown, since the drainage hole 2114 is located in the first shaft segment 211, the liquid outlet hole 2130 is located in the third shaft segment 213, and the outer diameter of the first shaft segment 211 is smaller than the outer diameter of the third shaft segment 213, the centrifugal force exerted on the gas in the liquid outlet hole 2130 is greater than the centrifugal force exerted on the gas in the drainage hole 2114, so that the gas will flow along the drainage hole 2114, the inside of the motor shaft 21 and the liquid outlet hole 2130 in sequence.

[0086] like Fig.14 As shown, under the action of airflow, the lubricating oil flows into the gap 3200 between the inner circumference of the gear shaft and the outer circumference of the first shaft section 211 of the motor shaft 21, and then flows through and lubricates the meshing of the inner spline and the outer spline. Then, the lubricating oil flows into the inside of the motor shaft 21 through the drainage hole 2114. Then, the lubricating oil inside the motor shaft 21 flows out through the liquid outlet 2130 and lubricates the motor rotor 22. Under the action of centrifugal force, the flow speed of the lubricating oil flowing through the meshing of the inner spline and the outer spline is faster, thereby further improving the lubrication effect of the meshing of the inner spline and the outer spline. Among them, the lubricating oil flowing out of the liquid outlet 2130 will fall into the housing 1, and after being collected by the internal oil channel 10, it will be output again from each oil outlet, thereby forming a circulation circuit of the lubricating oil.

[0087] In one embodiment, there are four liquid outlet holes 2130. Fig.13 and Fig.14 As shown, the aperture of each liquid outlet hole 2130 is larger than the aperture of each drainage hole 2114. Among them, since the liquid outlet hole 2130 needs to allow the lubricating oil inside the motor shaft 21 to flow out, and the lubricating oil inside the motor shaft 21 includes the lubricating oil output from the oil outlet hole 101, and also includes the lubricating oil flowing in from the drainage hole 2114. Therefore, the flow rate of the liquid outlet hole 2130 is greater than the flow rate of the drainage hole 2114. By setting the outer diameter of the drainage hole 2114 to be smaller than the aperture of the liquid outlet hole 2130, it is more in line with the actual situation.

[0088] like Fig.13 and Fig.14 As shown, along the radial direction of the motor shaft 21 , the length of each liquid outlet hole 2130 is greater than the length of each drainage hole 2114 .

[0089] like Fig.14 As shown, along the axial direction of the motor shaft 21, the distance d1 between each liquid outlet hole 2130 and the end surface of the second shaft segment 212 is greater than the distance d2 between each drainage hole 2114 and the end surface of the second shaft segment 212. The end surface of the second shaft segment 212 is opposite to the gear shaft.

[0090] The disclosed embodiments also provide an extended-range electric vehicle, which includes the above-mentioned extended-range electric assembly.

[0091] The terms used in the implementation mode of the present disclosure are only used to explain the embodiments of the present disclosure and are not intended to limit the present disclosure. Unless otherwise defined, the technical terms or scientific terms used in the implementation mode of the present disclosure should be the common meanings understood by people with ordinary skills in the field to which the present disclosure belongs. The above description is only an optional embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. An extended-range powertrain, characterized in that: The housing of the extended-range powertrain comprises: A motor cavity, a generator cavity and a gear cavity, wherein the motor cavity and the generator cavity are arranged in parallel, the motor cavity is used to fix the stator of a motor, the generator cavity is used to fix the stator of a generator, the generator is used to charge the power battery of the vehicle, the gear cavity is used to accommodate two sets of gear sets, one set of the gear sets is used to drive and connect an engine and the generator, and the motor drives the wheels of the vehicle through the other set of the gear sets; A bearing cavity and a bearing chamber, wherein the bearing cavity and the bearing chamber are respectively used to fix the outer rings of two bearings, the inner rings of the two bearings are used to fix the outer circumference of a hollow gear shaft in any group of the gear sets, the hollow gear shaft is used to accommodate a hollow motor shaft of the generator or the motor, and the internal spline of the inner circumference of the gear shaft is used to couple with the external spline of the motor shaft; Two oil outlet holes, the two oil outlet holes are distributed at the groove bottom of the bearing chamber, the two oil outlet holes are used to output lubricating oil transmitted by an internal oil channel of the housing, the aperture of one oil outlet hole is larger than the aperture of the other oil outlet hole, the distance between the axis of the one oil outlet hole and the axis of the bearing chamber is smaller than the distance between the axis of the other oil outlet hole and the axis of the bearing chamber, and the distance between the axis of the other oil outlet hole and the axis of the bearing chamber is smaller than the radius of the inner circumference of the gear shaft and larger than the radius of the outer circumference of the hollow motor shaft.

2. The extended-range powertrain according to claim 1, characterized in that: The groove bottom of the bearing chamber includes a boss, the end surface of the boss facing the motor shaft includes an opening of the oil outlet hole, and the boss is used to extend into the shaft cavity of the motor shaft.

3. The extended-range powertrain according to claim 2, characterized in that: The bearing chamber includes two connected cavities, and the two cavities are arranged along the axial direction of the one gear shaft. The inner diameter of one cavity is smaller than the inner diameter of the other cavity. The other cavity is used to fix the outer ring of the bearing and to accommodate the extension of at least one of the one motor shaft or the one gear shaft. The length of the other cavity along the axial direction of the one gear shaft is greater than the length of the one cavity, and the length of the one boss along the axial direction of the one gear shaft is greater than the length of the one cavity.

4. The extended-range powertrain according to claim 3, characterized in that: The groove bottom of the bearing chamber includes another boss, and the end surface of the other boss facing the motor shaft includes the opening of the other oil outlet hole. The length of the other boss along the axial direction of the gear shaft is smaller than the length of the one boss.

5. The extended-range powertrain according to any one of claims 1 to 4, characterized in that: The other oil outlet hole includes two hole segments, the distance between one hole segment and the one gear shaft is greater than the distance between the other hole segment and the one gear shaft, and the aperture of the one hole segment is smaller than the aperture of the other hole segment and smaller than the aperture of the one oil outlet hole.

6. The extended-range powertrain according to any one of claims 1 to 5, characterized in that: The inner circumference of the gear shaft includes two smooth sections and an inner spline section. The two smooth sections are distributed on both sides of the inner spline section along the axial direction of the gear shaft. The inner circumference of the inner spline section includes the inner spline. The distance between the axis of the other oil outlet hole and the axis of the bearing chamber is smaller than the radius of the inner circumference of any of the smooth sections.

7. The extended-range powertrain according to claim 6, characterized in that: The gear shaft comprises two end faces, the two end faces are opposite to each other in the radial direction of the gear shaft, each end face comprises an opening, each of the openings is used to connect to one of the smooth sections, and the aperture of each of the openings is larger than the inner diameter of any of the smooth sections.

8. The extended-range powertrain according to any one of claims 1 to 7, characterized in that: The motor shaft comprises a first shaft segment, a second shaft segment and a third shaft segment arranged along the axial direction of the motor shaft, the outer diameter of the first shaft segment is smaller than the outer diameter of the second shaft segment, the outer diameter of the second shaft segment is smaller than the outer diameter of the third shaft segment, the first shaft segment is used to extend into the interior of the gear shaft, the second shaft segment is used to fix the inner ring of a bearing of the motor shaft, and the third shaft segment is used to fix the rotor of the motor, wherein: The length of the first shaft segment is greater than that of the second shaft segment and less than that of the third shaft segment, and the inner diameter of the first shaft segment is less than or equal to the inner diameter of at least one of the second shaft segment or the third shaft segment.

9. The extended-range powertrain according to claim 8, characterized in that: The first shaft segment includes two optical shaft segments and a spline segment, the outer circumferential surface of the spline segment includes the external spline, the two optical shaft segments are distributed on both sides of the spline segment along the axial direction of the first shaft segment, one optical shaft segment extends into the bearing chamber, and the other optical shaft segment includes a plurality of drainage holes, the plurality of drainage holes are arranged at intervals along the circumference of the other optical shaft segment, and each of the drainage holes is connected to the inner circumferential surface and the outer circumferential surface of the first shaft segment along the radial direction of the first shaft segment.

10. The extended-range powertrain according to claim 9, characterized in that: The gap between the outer circumference of one optical axis segment and the inner circumference of one gear shaft is larger than the gap between the one spline segment and the inner circumference of one gear shaft, and smaller than the gap between the outer circumference of another optical axis segment and the inner circumference of one gear shaft.

11. The extended-range powertrain according to claim 9 or 10, characterized in that: The outer diameter of the second shaft segment is larger than the outer diameter of the gear shaft, and the gap between the second shaft segment and the gear shaft along the axial direction of the motor shaft is larger than the aperture of each of the drainage holes.

12. The extended-range powertrain according to any one of claims 9 to 11, characterized in that: The third shaft segment includes a plurality of liquid outlet holes, and the plurality of liquid outlet holes are arranged at intervals along the circumference of the third shaft segment. Each of the liquid outlet holes is connected to the inner circumference and the outer circumference of the third shaft segment in the radial direction of the third shaft segment, and the aperture of each of the liquid outlet holes is larger than the aperture of each of the drainage holes.

13. The extended-range powertrain according to claim 12, characterized in that: in: Along the radial direction of the motor shaft, the length of each of the liquid outlet holes is greater than the length of each of the drainage holes; Along the axial direction of the motor shaft, the end surface distance between each of the liquid outlet holes and the second shaft segment is greater than the end surface distance between each of the drainage holes and the second shaft segment.

14. The extended-range powertrain according to any one of claims 1 to 13, characterized in that: The housing (1) comprises two parts, the gear chamber (13) is formed between the two parts, one part comprises the motor chamber (11), the generator chamber (12) and the bearing chamber, and the other part comprises the bearing chamber and the two oil outlet holes.

15. An extended-range electric vehicle, characterized in that: The extended-range electric vehicle comprises an extended-range powertrain as described in any one of claims 1-14.

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