Extended-range power assembly and extended-range electric vehicle

Abstract

An extended-range power assembly and an extended-range electric vehicle. The extended-range power assembly comprises a generator, an electric motor, two gear sets (3, 4) and two housings (1, 2), wherein the two housings (1, 2) enclose and then accommodate the two gear sets (3, 4); the electric motor drives wheels of a vehicle by means of one gear set (3), and the other gear set (4) is in transmission connection with an engine and the generator; one gear set (3) comprises an input shaft (31), an intermediate shaft (32) and an output shaft (33); the housing (2) comprises three bearing chambers (21, 22, 23) and two oil passages (24, 25); the three bearing chambers (21, 22, 23) are configured to fix outer rings of bearings of the input shaft (31), the intermediate shaft (32) and the output shaft (33), respectively; and one oil passage (24) communicates the input-shaft bearing chamber (21) with the intermediate-shaft bearing chamber (22), and the other oil passage (25) communicates the intermediate-shaft bearing chamber (22) with the output-shaft bearing chamber (23).

Description

Range-extended powertrains and range-extended electric vehicles

[0001] This disclosure claims priority to Chinese patent application No. 202410851433.1, filed on June 27, 2024, entitled "Range-extended powertrain and range-extended electric vehicle", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure relates to the field of range-extended electric vehicle technology, and particularly to a range-extended powertrain and a range-extended electric vehicle. Background Technology

[0003] A range-extended powertrain includes a generator, an electric motor, and a gearbox. The gearbox comprises two gear sets; the engine drives the generator to produce electricity via one gear set, and the electric motor drives the vehicle's wheels via the other gear set. Within the gearbox, the gear sets are supported by bearings. For example, the outer ring of the bearing is fixed in the gearbox's bearing housing, and the inner ring of the bearing is fixed to the outer circumferential surface of the gear set's shaft. To improve the gearbox's reliability, the bearings require lubrication. Summary of the Invention

[0004] This disclosure provides a range-extended powertrain and a range-extended electric vehicle. The housing of the range-extended powertrain includes three bearing chambers, which are sequentially connected by two oil passages. The technical solutions for the range-extended powertrain and the range-extended electric vehicle are described below.

[0005] In a first aspect, this disclosure provides a range-extended powertrain. The range-extended powertrain includes a generator, an electric motor, two gear sets, and two detachable housings. One side of one housing includes two parallel motor cavities, which are respectively used to fix the stator of the electric motor and the stator of the generator. One side of the other housing is used to fix the generator. The other side of the first housing and the other side of the second housing, when closed together, accommodate the two gear sets. The electric motor drives the wheels of the vehicle through one gear set, and the other gear set is used to drive the generator and the generator. Each gear set includes a parallel-arranged input shaft, an intermediate shaft, and an output shaft. The distance between the axis of the intermediate shaft and the axis of the generator is greater than the distance between the axis of the input shaft and the axis of the output shaft and the axis of the generator. The other side of the other housing includes: three bearing chambers, each used to fix the outer ring of the bearings of the input shaft, the intermediate shaft, and the output shaft, respectively; and two oil passages, one connecting the bearing chamber of the input shaft and the bearing chamber of the intermediate shaft, and the other connecting the bearing chamber of the intermediate shaft and the bearing chamber of the output shaft. The included angle between the axes of the two oil passages points towards the other gear set.

[0006] The gearbox consists of two gear sets and two detachable housings.

[0007] The technical solution provided in this disclosure, by setting two oil passages connecting three bearing chambers, allows the lubricating oil in the input shaft bearing chamber to flow sequentially into the intermediate shaft bearing chamber and the output shaft bearing chamber, enabling the lubricating oil in the input shaft bearing chamber to be shared by all three bearing chambers, thus improving the utilization rate of the lubricating oil. Furthermore, by setting the included angle between the axes of the two oil passages towards the other gear set, the extending direction of the two oil passages tends to be consistent with the arrangement direction of the three bearing chambers.

[0008] In one implementation, the bottom of the bearing chamber of the input shaft includes an oil outlet for discharging lubricating oil transmitted through an internal oil passage of the housing.

[0009] The technical solution disclosed herein increases the amount of lubricating oil by providing an oil outlet hole at the bottom of the bearing chamber of the input shaft. Furthermore, by providing two oil passages connecting the three bearing chambers, the lubricating oil output from one oil outlet hole can be shared by all three bearing chambers, eliminating the need to provide an oil outlet hole in each bearing chamber. This improves the utilization rate of the lubricating oil output from the oil outlet hole and reduces the manufacturing cost of the range-extended powertrain.

[0010] In one implementation, the diameter of one oil outlet is smaller than the diameter of one oil passage. The diameter of one oil passage is smaller than the diameter of the other oil passage.

[0011] In one implementation, at least one bearing chamber comprises two communicating cavities, arranged sequentially along the axial direction of each bearing chamber. One cavity is used to fix an outer ring of a bearing, and the inner ring of the bearing is used to fit onto an input shaft, an intermediate shaft, or an output shaft. The inner diameter of the other cavity is smaller than the outer diameter of the outer ring of the bearing. The sidewall of the other cavity is used to form at least one outlet or inlet of an oil passage or at least one of the other oil passages. The outer ring of the bearing abuts against a stepped surface between the one cavity and the other cavity. The other cavity is capable of accumulating lubricating oil to ensure lubrication of the bearing.

[0012] In one implementation, along the axial direction of a bearing housing, the length of one cavity in the bearing housing is greater than the length of the other cavity.

[0013] In one implementation, the sidewall of the other cavity in the bearing chamber of the intermediate shaft includes the outlet of the first oil passage and the inlet of the second oil passage.

[0014] In one implementation, at least one of the bearing housings of the input shaft and the intermediate shaft includes a first protrusion on its sidewall. The first protrusion extends from the sidewall of the bearing housing along the length of one of the two oil passages. The first protrusion encloses the sidewall of the bearing housing to form an oil collection groove, which collects lubricating oil and guides overflowing lubricating oil to the one of the two oil passages.

[0015] The technical solution provided in this disclosure includes a first protrusion in the bearing chamber of the input shaft and / or the bearing chamber of the intermediate shaft, and the first protrusion forms an oil accumulation groove with the side wall of the bearing chamber. This ensures that the oil accumulation groove is filled with lubricating oil before the lubricating oil flows into the next bearing chamber through the oil passage. This guarantees that the bearing chamber of the input shaft and / or the bearing chamber of the intermediate shaft has sufficient lubricating oil to lubricate the bearings and ensures the lubrication effect.

[0016] In one implementation, the first protrusion is arranged adjacent to the inlet of one of the two oil passages, and the circumferential width of the first protrusion along the circumference of the bearing chamber is smaller than the circumferential width of the inlet of the one of the two oil passages.

[0017] In one implementation, the distance between the first protrusion and the axis of the bearing housing is less than the inner diameter of the outer ring of the bearing fixed in the bearing housing and greater than the outer diameter of the inner ring of the bearing. Thus, the highest point of the first protrusion is opposite to the ball between the outer and inner rings of the bearing, such that at least a portion of the ball is immersed in lubricating oil.

[0018] In one implementation, the extension length of the first protrusion in the bearing housing of the input shaft is less than the extension length of the first protrusion in the bearing housing of the intermediate shaft.

[0019] In one implementation, the bearing housing further includes a second protrusion extending from a side wall of the bearing housing toward the oil accumulation groove within the bearing housing. The extension length of the second protrusion is greater than the extension length of the first protrusion. Along the circumferential direction of the bearing housing, the second protrusion and the first protrusion are respectively arranged on both sides of the inlet of one of the two oil passages.

[0020] The technical solution provided in this disclosure includes a second protrusion in the bearing chamber. This allows lubricating oil flowing into the bearing chamber to first pass through the second protrusion and be guided into an oil collection groove. Subsequently, the lubricating oil overflows from the oil collection groove and flows through an oil passage into the next bearing chamber. The second protrusion prevents lubricating oil flowing into one bearing chamber from directly flowing into the next bearing chamber through the oil passage, thus preventing it from accumulating in the oil collection groove and ensuring that the oil collection groove contains sufficient lubricating oil to lubricate the bearing.

[0021] In one implementation, the second protrusion includes two ends. One end of the second protrusion is fixedly connected to the sidewall of the bearing housing, and the other end of the second protrusion is arranged radially spaced from the first protrusion in the bearing housing. The distance between the other end of the second protrusion and the first protrusion is greater than the circumferential width of the inlet of one of the two oil passages.

[0022] The technical solution provided in this disclosure allows lubricating oil overflowing from the oil sump to flow into the inlet of the oil passage through the gap between the other end of the second protrusion and the first protrusion. By setting the distance between the other end of the second protrusion and the first protrusion to be greater than the circumferential width of the inlet of one of the two oil passages, the smoothness of lubricating oil flowing into the inlet of the oil passage through the gap can be improved.

[0023] In one implementation, the second protrusion includes two sub-segments. One sub-segment connects the sidewall of the bearing housing to the other sub-segment of the second protrusion. The first sub-segment includes an arc-shaped section whose concave direction is away from the inlet of one of the two oil passages. The other sub-segment includes another arc-shaped section whose concave direction is towards the inlet of the first of the two oil passages.

[0024] The technical solution provided in this disclosure, by setting the concave direction of another arc segment toward the inlet of the oil passage, can avoid interference between the other arc segment and the input shaft or intermediate shaft.

[0025] In one implementation, the bearing chamber further includes a third protrusion. The third protrusion is arranged within the oil collection groove and is used to reduce the amount of oil accumulated in the groove. This prevents excessive lubricating oil from accumulating in the groove, which could result in insufficient lubricating oil flowing into the next bearing chamber, thus ensuring the lubrication effect of the bearings in each bearing chamber.

[0026] Secondly, this disclosure provides a range-extended electric vehicle. The range-extended electric vehicle includes a range-extended powertrain as described in any of the first aspects. Attached Figure Description

[0027] Figure 1 is a three-dimensional schematic diagram of a range-extended powertrain provided in an embodiment of this disclosure;

[0028] Figure 2 is a three-dimensional schematic diagram of a range-extended powertrain provided in an embodiment of this disclosure;

[0029] Figure 3 is a schematic diagram of the interior of a range-extended powertrain provided in an embodiment of this disclosure;

[0030] Figure 4 is a schematic diagram of the housing of a range-extended powertrain provided in an embodiment of this disclosure;

[0031] Figure 5 is a schematic diagram of the housing of a range-extended powertrain provided in an embodiment of this disclosure;

[0032] Figure 6 is a partial schematic diagram of the housing of a range-extended powertrain provided in an embodiment of this disclosure;

[0033] Figure 7 is a cross-sectional view of the housing of a range-extended powertrain provided in an embodiment of this disclosure;

[0034] Figure 8 is a cross-sectional view of the housing of a range-extended powertrain provided in an embodiment of this disclosure;

[0035] Figure 9 is a schematic diagram of the flow path of lubricating oil in a range-extended powertrain in a horizontal state according to an embodiment of this disclosure;

[0036] Figure 10 is a schematic diagram of the flow path of lubricating oil in a range-extended powertrain in a downhill state according to an embodiment of the present disclosure.

[0037] Figure 11 is a schematic diagram of the flow path of lubricating oil in a range-extended powertrain in an uphill state according to an embodiment of the present disclosure;

[0038] Figure 12 is a schematic diagram of the flow path of lubricating oil in another range-extended powertrain in an uphill state provided by an embodiment of this disclosure;

[0039] Figure 13 is a schematic diagram of the flow path of lubricating oil in another horizontal range-extended powertrain provided in an embodiment of this disclosure.

[0040] Figure 14 is a schematic diagram of the flow path of lubricating oil in another range-extended powertrain in a downhill state provided by an embodiment of this disclosure.

[0041] Figure 15 is a schematic diagram of the flow path of lubricating oil in another range-extended powertrain in an uphill state provided by an embodiment of this disclosure.

[0042] Figure 16 is a schematic diagram of the flow path of lubricating oil in another range-extended powertrain in a downhill state provided by an embodiment of this disclosure;

[0043] Figure 17 is a schematic diagram of the flow path of lubricating oil in another range-extended powertrain in a downhill state provided by an embodiment of the present disclosure. Detailed Implementation

[0044] This disclosure provides a range-extended powertrain. Referring to Figures 1-6, the range-extended powertrain includes a generator, an electric motor, two gear sets (3, 4), and two detachable housings (1, 2). As shown in Figure 1, one side of housing 1 includes two parallel motor cavities (11, 12). Motor cavity 11 is used to fix the stator of an electric motor. Motor cavity 12 is used to fix the stator of a generator. One side of housing 2 is used to fix an engine (as shown in Figure 2, an input shaft 41 is used for drive connection to the engine).

[0045] As shown in Figures 3 and 4, the other side of housing 1 and the other side of housing 2, when enclosed, accommodate two gear sets (3 and 4). The electric motor drives the vehicle's wheels through gear set 3. Gear set 4 is used to drive an engine and a generator. Housing 1, housing 2, and gear sets 3 and 4 located inside the housings can be referred to as a gearbox.

[0046] As shown in Figure 3, the gear set 3 includes an input shaft 31, an intermediate shaft 32, and an output shaft 33 arranged in parallel. The input shaft 31 is used to drive the electric motor, and the output shaft 33 is used to drive the vehicle wheels. Gears are installed on the input shaft 31, intermediate shaft 32, and output shaft 33, and the gears mesh with each other to realize the sequential transmission of power along the input shaft 31, intermediate shaft 32, and output shaft 33. Bearings are fitted at both ends of the input shaft 31, intermediate shaft 32, and output shaft 33 to support each shaft and ensure smooth rotation of each shaft.

[0047] As shown in Figure 3, the gear set 4 includes an input shaft 41 and an output shaft 42 arranged in parallel. The input shaft 41 is used to drive the engine, and the output shaft 42 is used to drive the generator. Gears are installed on both the input shaft 41 and the output shaft 42, and the gears mesh with each other to realize the transmission of power along the input shaft 41 to the output shaft 42. Bearings are fitted at both ends of the input shaft 41 and the output shaft 42 to support each shaft and ensure smooth rotation of each shaft.

[0048] As shown in Figure 3, in order to avoid the gear on the input shaft 41, the distance between the axis of the intermediate shaft 32 and the axis of a generator (that is, the axis of the output shaft 42) is greater than the distance between the axis of the input shaft 31 and the axis of the output shaft 33 and the axis of the generator.

[0049] As shown in Figure 4, the other side of the housing 2 includes bearing chambers 21, 22, and 23. Bearing chamber 21 is used to fix the outer ring of the bearing for the input shaft 31. Bearing chamber 22 is used to fix the outer ring of the bearing for the intermediate shaft 32. Bearing chamber 23 is used to fix the outer ring of the bearing for the output shaft 33. As shown in Figures 4 and 5, the other side of the housing 2 also includes two oil passages (24, 25). Oil passage 24 connects bearing chambers 21 and 22, and oil passage 25 connects bearing chambers 22 and 23. As shown in Figure 5, the included angle between the axis A of oil passage 24 and the axis B of oil passage 25 points towards the gear set 4.

[0050] Additionally, as shown in Figures 4 and 5, the other side of the housing 2 also includes bearing chambers 26 and 27. Bearing chamber 26 is used to fix the outer ring of the bearing for the input shaft 41, and bearing chamber 27 is used to fix the outer ring of the bearing for the output shaft 42. Furthermore, since the axis of bearing chamber 21 coincides with the axis of the input shaft 31, the axis of bearing chamber 22 coincides with the axis of the intermediate shaft 32, the axis of bearing chamber 23 coincides with the axis of the output shaft 33, and the axis of the generator coincides with the axis of bearing chamber 27, as shown in Figure 5, the distance d2 between the axes of bearing chamber 22 and bearing chamber 27 is greater than the distance d1 between the axes of bearing chamber 21 and bearing chamber 27, and the distance d3 between the axes of bearing chamber 23 and bearing chamber 27.

[0051] The technical solution provided in this disclosure provides two oil passages (24, 25) connecting three bearing chambers (21, 22, 23). This allows the lubricating oil in bearing chamber 21 to flow sequentially into bearing chambers 22 and 23 via the oil passages, enabling the lubricating oil in bearing chamber 21 to be shared by all three bearing chambers (21, 22, 23). This improves the utilization rate of the lubricating oil and the lubrication effect on the bearings. Furthermore, as shown in Figure 5, the angle between the axis A of oil passage 24 and the axis B of oil passage 25 points towards gear set 4, making the extension directions of oil passages 24 and 25 more consistent with the specific arrangement of the three bearing chambers.

[0052] As shown in Figures 5 and 6, the bottom of the bearing chamber 21 of the input shaft includes an oil outlet 20, which is used to output lubricating oil transmitted through an internal oil passage of the housing 2.

[0053] The technical solution provided in this disclosure increases the amount of lubricating oil by providing an oil outlet 20 at the bottom of the bearing chamber 21, compared to splash lubrication. Furthermore, by providing two oil passages (24, 25) connecting the three bearing chambers (21, 22, 23), the lubricating oil output from one oil outlet 20 can be shared by all three bearing chambers (21, 22, 23), eliminating the need to provide an oil outlet in each bearing chamber. This improves the utilization rate of the lubricating oil output from the oil outlet 20 and reduces the manufacturing cost of the range-extended powertrain.

[0054] As shown in Figure 6, the diameter of the oil outlet 20 is smaller than the diameter of the oil passage 24. Additionally, the diameter of the oil passage 24 can be smaller than the diameter of the oil passage 25.

[0055] As shown in Figure 7, the bearing chamber 21 includes a connected cavity 211 and a cavity 212. Cavities 211 and 212 are arranged sequentially along the axial direction of the bearing chamber 21. Cavity 211 is used to fix the outer ring of the bearing of the input shaft 31. The inner diameter of cavity 212 is smaller than the outer diameter of the outer ring of the bearing of the input shaft 31, so the outer ring of the bearing of the input shaft 31 abuts against the stepped surface between cavities 211 and 212. An inlet 241 of an oil passage 24 is provided on the side wall of cavity 212. Lubricating oil can accumulate in cavity 212, and the accumulated lubricating oil can lubricate the bearing balls and flow into the bearing chamber 22 from the oil passage 24.

[0056] As shown in Figure 7, the length of cavity 211 is greater than the length of cavity 212.

[0057] As shown in Figures 7 and 8, the bearing chamber 22 includes a connected cavity 221 and a cavity 222. Cavities 221 and 222 are arranged sequentially along the axial direction of the bearing chamber 22. Cavity 221 is used to fix the outer ring of the bearing of the intermediate shaft 32. The inner diameter of cavity 222 is smaller than the outer diameter of the outer ring of the bearing of the intermediate shaft 32, so the outer ring of the bearing of the intermediate shaft 32 abuts against the stepped surface between cavities 221 and 222. The side wall of cavity 222 has an outlet 242 of oil passage 24 and an inlet 251 of oil passage 25. Cavity 222 can receive and store lubricating oil input from the bearing chamber 21 through the outlet 242 of oil passage 24. The stored lubricating oil can lubricate the bearing balls and can flow into the bearing chamber 23 from the oil passage 25.

[0058] As shown in Figures 7 and 8, the length of cavity 221 is greater than the length of cavity 222.

[0059] As shown in Figures 7 and 8, the bearing chamber 23 includes a communicating cavity 231 and a cavity 232. Cavities 231 and 232 are arranged sequentially along the axial direction of the bearing chamber 23. Cavity 231 is used to fix the outer ring of the bearing for the output shaft 33. The inner diameter of cavity 232 is smaller than the outer diameter of the outer ring of the bearing for the output shaft 33, so the outer ring of the bearing for the output shaft 33 abuts against the stepped surface between cavities 231 and 232. An outlet 252 of an oil passage 25 is provided on the side wall of cavity 232. Cavity 232 can receive and store lubricating oil input from the bearing chamber 22 through the outlet 252 of the oil passage 25, and the stored lubricating oil can lubricate the bearing balls.

[0060] As shown in Figure 8, the length of cavity 231 is greater than the length of cavity 232.

[0061] As shown in Figures 7 and 8, the bottoms of cavities 212 and 222 are closed. As shown in Figure 8, the bottom of cavity 232 includes an opening.

[0062] As shown in Figures 9-17, the sidewall of the bearing chamber 21 includes a first protrusion 213, which extends from the sidewall of the bearing chamber 21 along the length of the oil passage 24. The first protrusion 213 encloses the sidewall of the bearing chamber 21 to form an oil accumulation groove 210. The oil accumulation groove 210 collects lubricating oil and guides overflowing lubricating oil to the oil passage 24. In this way, lubricating oil will flow into the bearing chamber 22 through the oil passage 24 after the oil accumulation groove 210 is full, ensuring that the bearing chamber 21 has sufficient lubricating oil to lubricate the bearing of the input shaft 31. As shown in Figures 9-17, the first protrusion 213 is located in the cavity 212 to avoid interference between the first protrusion 213 and the bearing located in the cavity 211.

[0063] As shown in Figures 9-17, the first protrusion 213 is arranged adjacent to the inlet 241 of the oil passage 24. In this way, after the oil accumulator 210 is full of lubricating oil, it flows directly into the inlet 241 of the oil passage 24, and then flows into the bearing chamber 22 through the oil passage 24.

[0064] As shown in Figures 9-17, along the circumference of the bearing chamber 21, the circumferential width of the first protrusion 213 is smaller than the circumferential width of the inlet 241 of the oil passage 24.

[0065] As shown in Figure 9, the distance L1 between the first protrusion 213 and the axis of the bearing housing 21 is smaller than the inner diameter of the outer ring of the bearing on the input shaft 31 and larger than the outer diameter of the inner ring of the bearing on the input shaft 31. In this way, the first protrusion 213 is at least partially aligned with the balls between the outer and inner rings of the bearing, ensuring that after the oil accumulator 210 is filled with lubricating oil, the oil level is higher than the bottom of the bearing balls, so that at least a portion of the balls are submerged in the lubricating oil, thus ensuring effective lubrication of the bearing.

[0066] To further ensure effective lubrication of the bearings, as shown in Figure 9, the oil level height H1 in the oil collection groove 210 is greater than the radius of the bearing balls. This ensures that at least half of the balls are submerged in the oil collection groove 210. As shown in Figure 9, H1 refers to the distance between the horizontal line passing through the highest point of the first protrusion 213 and the horizontal line passing through the lowest point of the cavity 212 when the range-extended powertrain is in a horizontal state. The range-extended powertrain being in a horizontal state refers to the state of the range-extended powertrain when the vehicle, including the range-extended powertrain, is driving or parked on a horizontal surface.

[0067] It should be noted that the range-extended powertrain also includes downhill and uphill states. As shown in Figures 11, 12, 15, and 17, the uphill state refers to the state of the range-extended powertrain when the vehicle is going uphill. As shown in Figures 10, 14, and 16, the downhill state refers to the state of the range-extended powertrain when the vehicle is going downhill. The uphill state corresponds to an uphill angle greater than or equal to 20° and less than or equal to 30°, for example, an uphill angle of 23°. The downhill state corresponds to a downhill angle greater than or equal to 20° and less than or equal to 30°, for example, a downhill angle of 23°.

[0068] As shown in Figures 9-17, the sidewall of the bearing chamber 22 includes a first protrusion 223, which extends from the sidewall of the bearing chamber 22 along the length of the oil passage 25. The first protrusion 223 encloses the sidewall of the bearing chamber 22 to form an oil accumulation groove 220. The oil accumulation groove 220 is used to collect lubricating oil and guide overflowing lubricating oil to the oil passage 25. In this way, the lubricating oil in the bearing chamber 22 will only flow into the bearing chamber 23 after the oil accumulation groove 220 is full, ensuring that the bearing chamber 22 has a sufficient amount of lubricating oil to lubricate the bearing of the intermediate shaft 32. The first protrusion 223 is located in the chamber 222.

[0069] As shown in Figures 9-17, the first protrusion 223 is arranged adjacent to the inlet 251 of the oil passage 25. In this way, after the oil accumulation groove 220 is filled with lubricating oil, it flows directly into the inlet 251 of the oil passage 25, and then flows into the bearing chamber 23 through the oil passage 25.

[0070] As shown in Figures 9-17, along the circumference of the bearing chamber 22, the circumferential width of the first protrusion 223 is smaller than the circumferential width of the inlet 251 of the oil passage 25.

[0071] As shown in Figure 9, the distance L2 between the first protrusion 223 and the axis of the bearing housing 22 is smaller than the inner diameter of the outer ring of the bearing on the intermediate shaft 32 and larger than the outer diameter of the inner ring of the bearing on the intermediate shaft 32. In this way, the first protrusion 223 is at least partially aligned with the balls between the outer and inner rings of the bearing, ensuring that after the oil accumulator 220 is filled with lubricating oil, the level of the lubricating oil is higher than the bottom of the bearing balls, so that at least a portion of the balls are immersed in the lubricating oil, thus ensuring effective lubrication of the bearing.

[0072] To further ensure effective lubrication of the bearings, as shown in Figure 9, the oil level height H2 in the oil collection groove 220 is greater than the radius of the bearing balls. This ensures that at least half of the balls are submerged in the oil collection groove 220. As shown in Figure 9, H2 refers to the distance between the horizontal line passing through the highest point of the first protrusion 223 and the horizontal line passing through the lowest point of the cavity 222 when the range-extended powertrain is in a horizontal position.

[0073] As shown in Figures 9-17, the extension length of the first protrusion 213 is less than the extension length of the first protrusion 223. As shown in Figure 3, the thickness of the outer ring of the bearing on the input shaft 31 is less than the thickness of the outer ring of the bearing on the intermediate shaft 32. Therefore, setting the extension length of the first protrusion 213 to be less than the extension length of the first protrusion 223 is more in line with the actual situation.

[0074] As shown in Figures 9-12, the bearing chamber 22 includes a second protrusion 224 extending from the side wall of the bearing chamber 22 toward the oil collection groove 220. The extension length of the second protrusion 224 is greater than that of the first protrusion 223. Along the circumference of the bearing chamber 22, the second protrusion 224 and the first protrusion 223 are arranged on both sides of the inlet 251 of the oil passage 25. Thus, the lubricating oil flowing from the outlet 242 of the oil passage 24 first flows through the second protrusion 224 and is guided by it into the oil collection groove 220. Then, the lubricating oil overflows from the oil collection groove 220 and flows back into the inlet 251 of the oil passage 25. The arrangement of the second protrusion 224 prevents the lubricating oil flowing from the outlet 242 of the oil passage 24 from directly flowing into the inlet 251 of the oil passage 25, thus preventing it from accumulating in the oil collection groove 220. The arrangement of the second protrusion 224 ensures the function of the oil collection groove 220 in accumulating lubricating oil. The second protrusion 224 is located in the chamber 222.

[0075] It should be noted that, as shown in Figure 9, when the range-extended powertrain is in a horizontal state, the vertical line of the outlet 242 of the oil passage 24 and the inlet 251 of the oil passage 25 are located on the same side of the first protrusion 223. If there is no second protrusion 224, the lubricating oil flowing out of the outlet 242 of the oil passage 24 will flow directly into the inlet 251 of the oil passage 25 and will not accumulate in the oil sump 220.

[0076] Additionally, as shown in Figure 13, the bearing housing 22 may not include the second protrusion 224. To prevent the lubricating oil flowing from the outlet 242 of the oil passage 24 from directly flowing into the inlet 251 of the oil passage 25, as shown in Figure 13, when the range-extender powertrain is in a horizontal position, the vertical line through the outlet 242 of the oil passage 24 and the inlet 251 of the oil passage 25 are positioned on either side of the first protrusion 223. In this way, the lubricating oil flowing from the outlet 242 of the oil passage 24 flows directly into the oil accumulator 220. When the oil accumulator 220 is full of lubricating oil, the lubricating oil overflows and flows into the bearing housing 23 through the oil passage 25.

[0077] As shown in Figures 9-12, the second protrusion 224 includes two ends. One end of the second protrusion 224 is fixedly connected to the side wall of the bearing chamber 22, and the other end of the second protrusion 224 is arranged radially spaced from the first protrusion 223 along the bearing chamber 22. In this way, when the lubricating oil in the oil accumulation groove 220 is full, it can flow into the inlet 251 of the oil passage 25 through the gap between the other end of the second protrusion 224 and the first protrusion 223.

[0078] As shown in Figures 9-12, the distance between the other end of the second protrusion 224 and the first protrusion 223 is greater than the circumferential width of the inlet 251 of the oil passage 25.

[0079] As shown in Figure 10, the second protrusion 224 includes sub-segment 2241 and sub-segment 2242. Sub-segment 2241 connects the sidewall of the bearing chamber 22 and sub-segment 2242. Sub-segment 2241 includes an arc-shaped segment, the concave direction of which is away from the inlet 251 of the oil passage 25; that is, the concave surface of the arc-shaped segment faces the inlet 251. Sub-segment 2242 includes another arc-shaped segment, the concave direction of which is towards the inlet of the oil passage 25; that is, the concave surface of the arc-shaped segment faces the center point of the bearing chamber 22. By providing the arc-shaped segment on sub-segment 2242, the end of the intermediate shaft 32 extending into the bearing chamber 22 can be avoided.

[0080] As shown in Figure 10, the arc surface of the sub-segment 2242 of the second protrusion 224 is a circular arc surface, and the axis corresponding to this circular arc surface coincides with the axis of the bearing chamber 22.

[0081] Furthermore, as shown in Figure 10, when the range-extended powertrain is in a downhill state, the volume of the oil accumulation groove 220 is relatively small. Therefore, as shown in Figure 10, the sub-segment 2241 of the second protrusion 224 and the side wall of the bearing chamber 22 enclose the oil accumulation groove 2240. Both the oil accumulation groove 2240 and the oil accumulation groove 220 can accumulate lubricating oil, thereby improving the lubrication effect on the bearings in the bearing chamber 22.

[0082] As shown in Figure 11, when the range-extended powertrain is in an uphill state, the volume of the oil accumulation groove 220 is relatively large. To avoid excessive accumulation of lubricating oil in the bearing chamber 22, there is no oil accumulation groove between the second protrusion 224 and the side wall of the bearing chamber 22. That is, in the uphill state, the height of the second protrusion 224 gradually decreases along the direction close to the oil accumulation groove 220.

[0083] As shown in Figures 13-17, the bearing chamber 21 includes a second protrusion 214 extending from the side wall of the bearing chamber 21 toward the oil collection groove 210. The extension length of the second protrusion 214 is greater than that of the first protrusion 213. Along the circumference of the bearing chamber 21, the second protrusion 214 and the first protrusion 213 are arranged on both sides of the inlet 241 of the oil passage 24. Thus, the lubricating oil sprayed from the oil outlet 20 first flows through the second protrusion 214 and is guided by it into the oil collection groove 210. Then, the lubricating oil overflows from the oil collection groove 210 and flows into the bearing chamber 22 through the oil passage 24. The arrangement of the second protrusion 214 prevents the lubricating oil sprayed from the oil outlet 20 from flowing directly into the inlet 241 of the oil passage 24 and accumulating in the oil collection groove 210, thus ensuring the oil collection function of the oil collection groove 210. The second protrusion 214 is located in the chamber 212.

[0084] It should be noted that, as shown in Figure 13, when the range-extender powertrain is in a horizontal state, the vertical line through the oil outlet 20 and the inlet 241 of the oil passage 24 are on the same side of the first protrusion 213. If the first protrusion 213 does not exist, the lubricating oil sprayed from the oil outlet 20 will flow directly into the inlet 241 of the oil passage 24 and will not accumulate in the oil sump 210.

[0085] Additionally, as shown in Figure 9, the bearing housing 21 may not include the second protrusion 214. To prevent the lubricating oil ejected from the oil outlet 20 from directly flowing into the inlet 241 of the oil passage 24, as shown in Figure 9, when the range-extender powertrain is in a horizontal position, the vertical line passing through the oil outlet 20 and the inlet 241 of the oil passage 24 are positioned on either side of the first protrusion 213. In this way, the lubricating oil ejected from the oil outlet 20 flows directly into the oil accumulator 210. When the oil accumulator 210 is full of lubricating oil, the lubricating oil overflows and flows into the bearing housing 22 through the oil passage 24.

[0086] As shown in Figures 13-17, the second protrusion 214 includes two ends. One end of the second protrusion 214 is fixedly connected to the side wall of the bearing chamber 21, and the other end of the second protrusion 214 is arranged radially at intervals with the first protrusion 213 along the bearing chamber 21. In this way, when the lubricating oil in the oil accumulation groove 210 is full, it can flow into the inlet 241 of the oil passage 24 through the gap between the other end of the second protrusion 214 and the first protrusion 213.

[0087] As shown in Figures 13-17, the distance between the other end of the second protrusion 214 and the first protrusion 213 is greater than the circumferential width of the inlet 241 of the oil passage 24.

[0088] As shown in Figure 15, the second protrusion 214 includes sub-segment 2141 and sub-segment 2142. Sub-segment 2141 connects the sidewall of the bearing chamber 21 and sub-segment 2142. Sub-segment 2141 includes an arc-shaped segment, the concave direction of which is away from the inlet 241 of the oil passage 24, that is, the concave surface of the arc-shaped segment faces the inlet 241. Sub-segment 2142 includes another arc-shaped segment, the concave direction of which is towards the inlet 241 of the oil passage 24, that is, the concave surface of the arc-shaped segment faces the center point of the bearing chamber 21. By providing the arc-shaped segment on sub-segment 2142, the end of the input shaft 31 extending into the bearing chamber 21 can be avoided, preventing interference between sub-segment 2142 and the end of the input shaft 31.

[0089] As shown in Figure 15, the arc surface of the sub-segment 2142 of the second protrusion 214 is a circular arc surface, and the axis corresponding to this circular arc surface coincides with the axis of the bearing chamber 21.

[0090] Furthermore, as shown in Figure 15, when the range-extended powertrain is in an uphill state, the volume of the oil collection groove 210 is relatively small. Therefore, as shown in Figure 15, the sub-segment 2141 of the second protrusion 214 and the side wall of the bearing chamber 21 enclose the oil collection groove 2140. Both the oil collection groove 2140 and the oil collection groove 210 can accumulate lubricating oil, thereby improving the lubrication effect on the bearings in the bearing chamber 21.

[0091] As shown in Figure 14, when the range-extended powertrain is in a downhill state, the volume of the oil accumulation groove 210 is relatively large. To avoid excessive accumulation of lubricating oil in the bearing chamber 21, there is no oil accumulation groove between the second protrusion 214 and the side wall of the bearing chamber 21. That is, in the downhill state, the height of the second protrusion 214 gradually decreases along the direction close to the oil accumulation groove 210.

[0092] As shown in Figures 9-12 and 16, the bearing chamber 21 includes a third protrusion 215 located in the oil accumulation groove 210 and used to reduce the amount of oil accumulated in the oil accumulation groove 210. This prevents excessive oil accumulation in the oil accumulation groove 210, which could lead to insufficient lubrication in the bearing chambers 22 and 23. The third protrusion 215 is located within the cavity 212.

[0093] As shown in Figures 9-12 and 16, both ends of the third protrusion 215 are connected to the chamber 212. The third protrusion 215 divides the chamber 212 into a main chamber and a sub-chamber 2150. The oil outlet 20, the first protrusion 213, and the inlet 241 of the oil passage 24 are located in the main chamber. The sub-chamber 2150 and the third protrusion 215 are at least partially located in the oil sump 210. In this way, the reduced volume of the oil sump 210 (including the volume occupied by the sub-chamber 2150 and the volume occupied by the third protrusion 215) is greater than the volume of the third protrusion 215, reducing the weight of the third protrusion 215 and thus reducing the weight of the range-extended powertrain.

[0094] As shown in Figures 9-12 and 16, the third protrusion 215 includes a concave surface facing the central axis of the bearing housing 21. The concave surface is used to avoid the end of the input shaft 31 extending into the bearing housing 21. The concave surface can be an arc surface, and the axis corresponding to the arc surface coincides with the axis of the bearing housing 21.

[0095] As shown in Figures 10 and 16, when the range-extended powertrain is in a downhill state, the volume of the oil sump 210 is at its maximum. Therefore, in the downhill state, the sub-chamber 2150 is located completely below the horizontal line passing through the highest point of the first protrusion 213, so as to make full use of the third protrusion 215 to reduce the volume of the oil sump 210.

[0096] As shown in Figures 12 and 17, the bearing chamber 22 includes a third protrusion 225 located in the oil accumulation groove 220 and used to reduce the amount of oil accumulated in the oil accumulation groove 220. This prevents excessive oil accumulation in the oil accumulation groove 220 of the bearing chamber 22, which could lead to insufficient lubrication of the bearing chamber 23. The third protrusion 225 is located within the chamber 222.

[0097] As shown in Figures 12 and 17, both ends of the third protrusion 225 are connected to the chamber 222. The third protrusion 225 divides the chamber 222 into a main chamber and a sub-chamber 2250. The outlet 242 of the oil passage 24, the inlet 251 of the oil passage 25, and the first protrusion 223 are located in the main chamber, while the sub-chamber 2250 and the third protrusion 225 are at least partially located in the oil sump 220. In this way, the reduced volume of the oil sump 220 (including the volume occupied by the sub-chamber 2250 and the volume occupied by the third protrusion 225) is greater than the volume of the third protrusion 225, reducing the weight of the third protrusion 225 and thus reducing the weight of the range-extended powertrain.

[0098] As shown in Figures 12 and 17, the third protrusion 225 includes a concave surface facing the central axis of the bearing housing 22. The concave surface is used to avoid the end of the intermediate shaft 32 extending into the bearing housing 22. The concave surface can be an arc surface, and the axis corresponding to the arc surface coincides with the axis of the bearing housing 22.

[0099] As shown in Figures 12 and 17, when the range-extended powertrain is in an uphill state, the volume of the oil sump 220 is at its maximum. Therefore, in the uphill state, the sub-chamber 2250 is located completely below the horizontal line passing through the highest point of the first protrusion 223, so as to make full use of the third protrusion 225 to reduce the volume of the oil sump 220.

[0100] As shown in Figures 9-12, the bottom of the bearing chamber 21 includes a column 216, which is coaxial with the bearing chamber 21. As shown in Figures 9, 11, and 12, the column 216 can guide the lubricating oil output from the oil outlet 20.

[0101] The following section uses the housing 2 shown in Figures 9-11 as an example to illustrate the flow path of lubricating oil when the range-extender powertrain is in various states.

[0102] As shown in Figure 9, the range-extender powertrain is in a horizontal position. Lubricating oil output from the oil outlet 20 flows sequentially through the column 216 and the third protrusion 215, and then accumulates in the oil collection tank 210. Once the oil collection tank 210 is full, the lubricating oil overflows and flows into the bearing chamber 22 via the oil passage 24. The lubricating oil flowing from the outlet 242 of the oil passage 24 first flows through the second protrusion 224 and is guided by it into the oil collection tank 220. Once the oil collection tank 220 is full, the lubricating oil overflows and flows into the bearing chamber 23 via the oil passage 25.

[0103] As shown in Figure 10, when the range-extended powertrain is in a downhill state, the lubricating oil output from the oil outlet 20 first flows through the third protrusion 215 and then accumulates in the oil collection groove 210. After the oil collection groove 210 is full of lubricating oil, the lubricating oil overflows and flows into the bearing chamber 22 through the oil passage 24. The lubricating oil flowing out of the outlet 242 of the oil passage 24 first flows through the second protrusion 224 and accumulates in the oil collection groove 2240 formed by the second protrusion 224 and the side wall of the bearing chamber 22. After the oil collection groove 2240 is full of lubricating oil, the lubricating oil overflows and flows into the oil collection groove 220. After the oil collection groove 220 is full of lubricating oil, the lubricating oil overflows and flows into the bearing chamber 23 through the oil passage 25.

[0104] As shown in Figure 11, when the range-extended powertrain is in an uphill state, the lubricating oil output from the oil outlet 20 first flows through the column 216. The column 216 guides part of the lubricating oil to the third protrusion 215, and another part is directly guided to the inlet 241 of the oil passage 24. The third protrusion 215 guides the lubricating oil to the oil sump 210. After the oil sump 210 is full of lubricating oil, the lubricating oil overflows and flows into the bearing chamber 22 through the oil passage 24. The lubricating oil flowing out of the outlet 242 of the oil passage 24 flows directly into the oil sump 220. After the oil sump 220 is full of lubricating oil, the lubricating oil overflows and flows into the bearing chamber 23 through the oil passage 25.

[0105] As shown in Figure 11, the oil collection groove 220 has a larger volume when the range-extended powertrain is in an uphill state. Therefore, as shown in Figure 12, a third protrusion 225 can be provided in the oil collection groove 220 to reduce the volume of the oil collection groove 220.

[0106] The following section uses the housing 2 shown in Figures 13-15 as an example to illustrate the flow path of lubricating oil when the range-extender powertrain is in various states.

[0107] As shown in Figure 13, the range-extender powertrain is in a horizontal position. Lubricating oil output from the oil outlet 20 flows through the second protrusion 214 and is guided by it into the oil collection groove 210. After the oil collection groove 210 is full of lubricating oil, the lubricating oil overflows and flows into the bearing chamber 22 through the oil passage 24. Lubricating oil flowing from the outlet 242 of the oil passage 24 flows into the oil collection groove 220. After the oil collection groove 220 is full of lubricating oil, the lubricating oil overflows and flows into the bearing chamber 23 through the oil passage 25.

[0108] As shown in Figure 14, when the range-extended powertrain is in a downhill state, the lubricating oil output from the oil outlet 20 flows into the oil collection tank 210. After the oil collection tank 210 is full of lubricating oil, the lubricating oil overflows and flows into the bearing chamber 22 through the oil passage 24. The lubricating oil flowing out of the outlet 242 of the oil passage 24 flows into the oil collection tank 220. After the oil collection tank 220 is full of lubricating oil, the lubricating oil overflows and flows into the bearing chamber 23 through the oil passage 25. As shown in Figure 14, when the range-extended powertrain is in a downhill state, the capacity of the oil collection tank 210 is too large. Therefore, as shown in Figure 16, a third protrusion 215 can be provided in the oil collection tank 210 to reduce the volume of the oil collection tank 210.

[0109] As shown in Figure 15, when the range-extended powertrain is in an uphill state, the lubricating oil output from the oil outlet 20 flows through the second protrusion 214 and accumulates in the oil collection groove 2140 formed by the second protrusion 214 and the side wall of the bearing chamber 21. After the oil collection groove 2140 is full of lubricating oil, the lubricating oil overflows and flows into the oil collection groove 210. After the oil collection groove 210 is full of lubricating oil, the lubricating oil overflows and flows into the bearing chamber 22 through the oil passage 24. The lubricating oil flowing out of the outlet 242 of the oil passage 24 flows into the oil collection groove 220. After the oil collection groove 220 is full of lubricating oil, the lubricating oil overflows and flows into the bearing chamber 23 through the oil passage 25. As shown in Figure 15, if the capacity of the oil collection groove 220 is too large, as shown in Figure 17, a third protrusion 225 can be provided in the oil collection groove 220 to reduce the volume of the oil collection groove 220.

[0110] In summary, the technical solution provided by the embodiments of this disclosure, by providing an oil outlet 20 in the bearing chamber 21, and providing an oil passage 24 to connect the bearing chamber 21 and the bearing chamber 22, and providing an oil passage 25 to connect the bearing chamber 22 and the bearing chamber 23, allows the lubricating oil output from the oil outlet 20 to be shared by the bearing chambers 21, 22 and 23, thereby improving the utilization rate of the lubricating oil output from the oil outlet 20, reducing the number of required oil outlets 20, and reducing the manufacturing difficulty and cost of the range-extended powertrain.

[0111] Furthermore, by providing first protrusions 213 and 223 in bearing chambers 21 and 22 respectively, and forming oil accumulation grooves 210 and 220 in bearing chambers 21 and 22 respectively, sufficient lubricating oil is provided in bearing chambers 21 and 22 for bearing lubrication. Moreover, by providing a second protrusion (second protrusion 214 or second protrusion 224), it is ensured that the lubricating oil flows through the oil accumulation groove (oil accumulation groove 210 or oil accumulation groove 220) before flowing into the next bearing chamber, thus ensuring the oil accumulation function of the oil accumulation groove. Furthermore, by providing a third protrusion (third protrusion 215 or third protrusion 225), excessive amounts of lubricating oil accumulated in bearing chambers 21 and / or 22 can be avoided.

[0112] The technical solution provided in this embodiment ensures that, through the cooperation of the aforementioned protrusions, the lubricating oil can flow smoothly along the bearing chamber 21, oil passage 24, bearing chamber 22, oil passage 25 and bearing chamber 23 in various states of the range-extended powertrain.

[0113] This disclosure also provides a range-extended electric vehicle. The range-extended electric vehicle includes the above-described range-extended powertrain.

[0114] The terminology used in the embodiments of this disclosure is for illustrative purposes only and is not intended to limit the scope of this disclosure. Unless otherwise defined, the technical or scientific terms used in the embodiments of this disclosure should have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The above descriptions are merely optional embodiments of this disclosure and are not intended to limit the disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A range-extended powertrain, characterized in that, The range-extended powertrain includes a generator, an electric motor, two gear sets, and two detachable housings. One side of one housing includes two parallel motor cavities, which are used to fix the stator of the electric motor and the stator of the generator, respectively. One side of the other housing is used to fix the engine. The other side of the first housing and the other side of the second housing together enclose the two gear sets. The electric motor drives the vehicle wheels through one gear set, and the other gear set is used to drive the engine and the generator. The gear set includes an input shaft, an intermediate shaft, and an output shaft arranged in parallel. The distance between the axis of the intermediate shaft and the axis of the generator is greater than the distance between the axis of the input shaft and the axis of the output shaft and the axis of the generator. The other side of the second housing includes: Three bearing chambers, the three bearing chambers being used to fix the outer rings of the bearings of the input shaft, the intermediate shaft and the output shaft respectively; Two oil passages, one for connecting the bearing housing of the input shaft and the bearing housing of the intermediate shaft, and the other for connecting the bearing housing of the intermediate shaft and the bearing housing of the output shaft, the included angle between the axes of the two oil passages pointing toward the other gear set.

2. The range-extended powertrain according to claim 1, characterized in that, The bearing chamber of the input shaft includes an oil outlet at the bottom of the groove, which is used to output lubricating oil transmitted through an internal oil passage of the housing.

3. The range-extended powertrain according to claim 2, characterized in that, The diameter of one oil outlet hole is smaller than the diameter of one oil passage, and the diameter of one oil passage is smaller than the diameter of the other oil passage.

4. The range-extended powertrain according to any one of claims 1-3, characterized in that, At least one of the bearing chambers includes two communicating cavities, with one cavity and the other cavity arranged sequentially along the axial direction of each bearing chamber. One cavity is used to fix an outer ring of a bearing, and the inner ring of the bearing is used to fit onto an input shaft, an intermediate shaft, or an output shaft. The inner diameter of the other cavity is smaller than the outer diameter of the outer ring of the bearing, and the sidewall of the other cavity is used to open at least one of the outlet or inlet of the oil passage or at least one of the other oil passages.

5. The range-extended powertrain according to claim 4, characterized in that, Along the axial direction of a bearing housing, the length of one cavity in the bearing housing is greater than the length of the other cavity.

6. The range-extended powertrain according to claim 4 or 5, characterized in that, The sidewall of the other cavity in the bearing chamber of the intermediate shaft includes the outlet of the oil passage and the inlet of the other oil passage.

7. The range-extended powertrain according to any one of claims 1-6, characterized in that, The sidewall of at least one of the bearing housing of the input shaft and the bearing housing of the intermediate shaft includes a first protrusion extending from the sidewall of the bearing housing along the length of one of the two oil passages. The first protrusion is used to enclose the sidewall of the bearing housing to form an oil collection groove, which is used to collect lubricating oil and guide overflowing lubricating oil to the one of the two oil passages.

8. The range-extended powertrain according to claim 7, characterized in that, The first protrusion is arranged adjacent to the inlet of one of the two oil passages, and the circumferential width of the first protrusion along the circumference of the bearing chamber is smaller than the circumferential width of the inlet of the one of the two oil passages.

9. The range-extended powertrain according to claim 7 or 8, characterized in that, The distance between the first protrusion and the axis of the bearing housing is less than the inner diameter of the outer ring of the bearing fixed in the bearing housing and greater than the outer diameter of the inner ring of the bearing.

10. The range-extended powertrain according to any one of claims 7-9, characterized in that, The extension length of the first protrusion in the bearing housing of the input shaft is less than the extension length of the first protrusion in the bearing housing of the intermediate shaft.

11. The range-extended powertrain according to any one of claims 7-10, characterized in that, The bearing housing further includes a second protrusion extending from a side wall of the bearing housing toward an oil accumulation groove within the bearing housing, the extension length of the second protrusion being greater than the extension length of the first protrusion, wherein: Along the circumference of the bearing chamber, the second protrusion and the first protrusion in the bearing chamber are respectively arranged on both sides of the inlet of one of the two oil passages.

12. The range-extended powertrain according to claim 11, characterized in that, The second protrusion includes two ends, one end of which is fixedly connected to the side wall of the bearing housing, and the other end of which is arranged radially spaced from the first protrusion in the bearing housing, wherein: The distance between the other end of the second protrusion and the first protrusion is greater than the circumferential width of the inlet of one of the two oil passages.

13. The range-extended powertrain according to any one of claims 11-12, characterized in that, The second protrusion includes two sub-segments, one sub-segment of which connects the sidewall of the bearing housing to the other sub-segment of the second protrusion, wherein: The segment includes an arc-shaped segment, the concave direction of which is away from the inlet of one of the two oil passages; The other sub-segment includes another arc-shaped segment, the concave direction of which faces the inlet of one of the two oil passages.

14. The range-extended powertrain according to any one of claims 7-13, characterized in that, The bearing housing also includes a third protrusion arranged within the oil accumulation groove, the third protrusion being used to reduce the amount of oil accumulated in the oil accumulation groove.

15. A range-extended electric vehicle, characterized in that, The range-extended electric vehicle includes the range-extended powertrain as described in any one of claims 1-14.

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