Planetary gearbox and vehicle power system

Abstract

The utility model provides a planetary gear box and a vehicle power system.The planetary gear box comprises a planet carrier (1), a gear box (2), a gear box (3), a gear box (4) and a gear box (5), and the planet carrier (1) is provided with a planet pin oil inlet channel (13); the planet pin (5) is in a hollow cylinder shape, the planet pin (5) is connected to the planet carrier (1), the planet pin (5) is provided with an oil outlet hole, the oil outlet hole penetrates through the peripheral wall of the planet pin (5), and the planet pin oil inlet channel (13) is communicated to the planet pin (5) so as to be communicated to the oil outlet hole; the gear bearing (4) is arranged on the planet pin (5) in a sleeving mode, and oil in the planet pin (5) can be guided to the gear bearing (4) through the oil outlet hole; and the planetary gear (3) is arranged on the gear bearing (4) in a sleeving manner.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to a planetary gearbox and a vehicle power system. Background Technology

[0002] In a planetary gearbox, the pins are fixed to the planet carrier. The planetary gears are supported on the planetary pins by needle roller bearings, and the differential gears are directly supported on the differential pins. A washer is placed between the end face of all gears and the planet carrier to reduce component wear. To ensure proper operation of the planetary gearbox, the gearbox components, including gears, bearings, and washers, require adequate lubrication.

[0003] DE102016222444A1 discloses a drive assembly in which an oil collector is mounted on the end face of a planetary carrier, and during gearbox operation, oil splashed from the gears is collected and guided to the pins, thereby lubricating the bearings and washers.

[0004] US20200132186A1 discloses an assembly for a turbine planetary gear reducer, including a lubrication wheel and a lubricant nozzle, which sprays oil onto an oil collector to reduce the impact of gearbox tilt on the amount of oil collected. However, the oil collected by the oil collector has no oil pressure and needs to be guided to the required lubrication area by gravity or centrifugal force. This is affected by the gearbox tilt angle, and the amount of oil guided to the lubrication area is difficult to control, resulting in poor lubrication.

[0005] CN113847412A discloses a non-interrupted lubrication structure and method for planetary gear trains. In this method, pressurized oil enters an oil chamber formed by a planetary carrier and an oil sleeve, then enters a distribution sleeve to distribute the oil to different locations. Bearings are lubricated through oil holes on pins, while gears are lubricated through grease fittings mounted on the planetary carrier. However, achieving this lubrication requires a large number of parts, resulting in a complex structure, high cost, and low reliability. Utility Model Content

[0006] This application aims to provide a planetary gearbox with fewer parts, a simpler structure, and lower cost.

[0007] This application proposes a planetary gearbox, comprising:

[0008] Planetary carrier, wherein the planetary carrier is provided with planetary pin oil inlet channels;

[0009] Planetary pin, which is a hollow cylindrical shape, is connected to the planet carrier. The planetary pin is provided with an oil outlet hole that penetrates the peripheral wall of the planetary pin. The planetary pin oil inlet channel is connected to the planetary pin and thus to the oil outlet hole.

[0010] A gear bearing, which is fitted onto the planetary pin, allows oil from inside the planetary pin to be guided to the gear bearing via the oil outlet; and

[0011] Planetary gears, which are fitted onto the gear bearings.

[0012] In at least one possible implementation, the planetary gearbox further includes:

[0013] A differential pin, which is a hollow cylindrical shape, is connected to the planetary carrier. The differential pin has a differential gear oil hole that penetrates the peripheral wall of the differential pin.

[0014] The differential gear is sleeved on the differential pin.

[0015] The planetary carrier is provided with a differential pin oil inlet channel, which is connected to the differential pin.

[0016] In at least one possible embodiment, the planetary gearbox is connected to a motor housing, the motor housing having a bearing mounting portion, and the planetary carrier comprising a planetary carrier body and a bearing mating portion, the bearing mating portion being located radially inward of the planetary carrier body. The bearing mounting portion and the bearing mating portion are connected via a planetary carrier bearing, enabling the planetary carrier to rotate relative to the motor housing.

[0017] In the radial direction of the planetary gearbox, a sealing ring mounting groove is provided between the planetary carrier body and the bearing mounting portion. This groove is provided with at least two sealing rings, which are spaced apart axially along the planetary gearbox, thereby forming an annular oil cavity between the at least two sealing rings.

[0018] The upstream end of the planetary pin oil inlet channel is connected to the annular oil chamber, and the upstream end of the differential pin oil inlet channel is connected to the annular oil chamber.

[0019] In at least one possible implementation, the planetary carrier is provided with a planetary carrier bearing lubrication channel, the upstream end of which extends to the axial end of the gear bearing, and the downstream end of which extends to the location of the planetary carrier bearing.

[0020] In at least one possible implementation, the differential pin oil inlet passage includes a first differential pin oil inlet passage, a second differential pin oil inlet passage, and a third differential pin oil inlet passage.

[0021] The upstream end of the first oil inlet channel of the differential pin is connected to the annular oil chamber.

[0022] The downstream end of the first oil inlet channel of the differential pin is connected to the second oil inlet channel of the differential pin, and the downstream end of the second oil inlet channel of the differential pin is connected to the third oil inlet channel of the differential pin.

[0023] The first oil inlet passage of the differential pin extends radially along the planetary gearbox.

[0024] The second oil inlet passage of the differential pin extends axially along the planetary gearbox.

[0025] The differential pin has multiple third oil inlet channels, and one differential pin second oil inlet channel and multiple differential pin third oil inlet channels are connected.

[0026] In at least one possible implementation, a plurality of differential gear oil holes are provided along the axial direction of the differential pin, and a plurality of differential gear oil holes are provided along the circumferential direction of the differential pin.

[0027] In at least one possible implementation, two gear bearings are provided on the same planetary pin, and a washer is provided between the two gear bearings. Oil supplied from the oil outlet to the outside of the planetary pin is separated by the washer and flows to both axial sides of the planetary pin.

[0028] In at least one possible implementation, the planetary gearbox further includes a planet cover that supports the planetary pin, the planet cover having a planet cover bearing oil supply hole aligned with the planetary pin.

[0029] This application also proposes a vehicle powertrain system, which includes:

[0030] Motor housing; and

[0031] The planetary gearbox described in any one of the above technical solutions.

[0032] In at least one possible implementation, it includes an oil pump for supplying oil to the planetary pin inlet channel.

[0033] By adopting the above technical solution, oil guide channels can be directly set on the planetary carrier, eliminating the need for additional parts to form the oil guide channels. This results in a simple structure, low cost, and high reliability. Attached Figure Description

[0034] Figure 1 A cross-sectional view of a planetary gearbox according to an embodiment of this application is shown.

[0035] Figure 2 An enlarged cross-sectional view of another section of a planetary gearbox according to an embodiment of this application is shown.

[0036] Figure 3 An enlarged cross-sectional view of another section of a planetary gearbox according to an embodiment of this application is shown.

[0037] Figure 4 A schematic diagram of the internal passages of a planetary gearbox according to an embodiment of this application is shown.

[0038] Figure 5 A schematic diagram of the internal passage of a planetary gearbox according to an embodiment of this application is shown from another angle.

[0039] Explanation of reference numerals in the attached figures

[0040] 100 Motor housing 101 Motor housing oil inlet 102 Bearing mounting section

[0041] 1. Planetary carrier; 11. Planetary carrier body; 12. Bearing mating part; 13. Planetary pin oil inlet channel; 14. Planetary carrier bearing; 15. Annular oil chamber; 16. Planetary carrier bearing lubrication channel; 17. First oil inlet channel for differential pin; 18. Second oil inlet channel for differential pin; 19. Third oil inlet channel for differential pin.

[0042] 2 planetary cover 21 planetary cover bearing

[0043] 3 planetary gears; 31 major diameter gears; 32 minor diameter gears; 33 planetary gear washers.

[0044] 4 gear bearings 41 washers

[0045] 5. Planetary pin; 51. Bearing oil outlet; 52. Differential gear oil outlet; 53. Small diameter gear oil outlet; 6. Differential pin

[0046] 7 Differential gear 71 Differential gear shim

[0047] 8 Gearbox housing

[0048] 9. Sealing ring

[0049] G1 Sun Gear

[0050] G2 gear ring

[0051] G3 side gear

[0052] Axial direction C circumferential direction R radial direction Detailed Implementation

[0053] To more clearly illustrate the above-mentioned objectives, features, and advantages of this application, specific embodiments of this application are described in detail in conjunction with the accompanying drawings in this section. Besides the embodiments described in this section, this application can also be implemented in other different ways. Those skilled in the art can make corresponding improvements, modifications, and substitutions without departing from the spirit of this application; therefore, this application is not limited to the specific embodiments disclosed in this section. The scope of protection of this application should be determined by the claims.

[0054] like Figures 1 to 5 As shown, embodiments of this application propose a vehicle powertrain system, which includes a motor housing 100 and a planetary gearbox. The planetary gearbox can be connected to the motor housing 100, and the output shaft of the motor can be connected to the sun gear G1 of the planetary gearbox. This vehicle powertrain system can be, for example, a coaxial electric axle drive system.

[0055] The planetary gearbox includes a planet carrier 1, a planet cover 2, planetary gears 3, gear bearings 4, planetary pins 5, differential pins 6, differential gears 7, a gearbox housing 8, and a sealing ring 9.

[0056] The motor housing 100 and the gearbox housing 8 are fixedly connected and form a receiving cavity. The planetary carrier 1, planetary cover 2, planetary gear 3, gear bearing 4, planetary pin 5, differential pin 6, and differential gear 7 are all located inside the receiving cavity. The receiving cavity is also provided with a gear ring G2 and a side gear G3, wherein the differential gear 7 and the side gear G3 mesh.

[0057] The planetary carrier 1 may include a planetary carrier body 11 and a bearing mating part 12. The bearing mating part 12 may be located radially inside the planetary carrier body 11 and close to the motor housing 100 in the axial direction A. The motor housing 100 has a bearing mounting part 102.

[0058] The bearing mounting portion 102 of the motor housing 100 and the bearing mating portion 12 of the planetary carrier 1 can be connected by a planetary carrier bearing 14. The planetary carrier bearing 14 can be located radially inside the bearing mounting portion 102 and radially outside the bearing mating portion 12, and the planetary carrier 1 can rotate relative to the motor housing 100.

[0059] The motor housing 100 may be provided with a motor housing oil inlet 101, which may be located in the bearing mounting part 102. Oil can be supplied to the planetary gearbox through the motor housing oil inlet 101.

[0060] A sealing ring mounting groove may be provided between the planetary carrier body 11 and the bearing mounting part 102 on the radial direction R of the planetary gearbox. This groove may be provided with at least two sealing rings 9, which may be spaced apart along the axial direction A of the planetary gearbox, forming an annular oil chamber 15 between the at least two sealing rings 9. The motor housing oil inlet 101 may communicate with the annular oil chamber 15. The vehicle power system also includes an oil pump for actively supplying oil to the annular oil chamber 15, and subsequently to the planetary pin oil inlet passage 13 and the differential pin oil inlet passage. Actively pumped pressurized oil requires less oil for lubrication compared to passively agitated oil, allowing for a lower oil level.

[0061] Planetary carrier 1 and planetary cover 2 support planetary gear 3. Planetary pin 5 is fixedly connected to planetary carrier 1 and planetary cover 2. Planetary gear 3 is rotatably connected to planetary pin 5 relative to planetary carrier 1 and planetary cover 2. Planetary pin 5 can be a hollow cylinder, and one axial end of planetary pin 5 is sealed by planetary carrier 1. Planetary gear 3 is fitted onto planetary pin 5, and planetary pin 5 supports planetary gear 3. Gear bearing 4 is fitted onto planetary pin 5. Gear bearing 4 (e.g., needle roller bearing) can be arranged between planetary gear 3 and planetary pin 5 in the radial direction of planetary gear 3. One planetary gear 3 can be supported by one or more (e.g., two) gear bearings 4. For example, two gear bearings 4 can be arranged along axial direction A, and the two gear bearings 4 can be separated by washers 41. Two gear bearings 4 are arranged on the same planetary pin 5, and washers 41 are arranged between the two gear bearings 4. Washer 41 may have a retaining ring extending radially inward from the body of washer 41. The retaining ring may extend to the outer circumferential surface of planetary pin 5. Oil supplied from the oil outlet to the planetary pin 5 is separated by the retaining ring and flows to both axial sides of planetary pin 5. For example, two or two sets of bearing oil outlets 51 may be provided on both axial sides of the retaining ring, and the amount of oil on both sides can be controlled so that both gear bearings 4 on both sides of the retaining ring are adequately lubricated.

[0062] The planetary gearbox can be equipped with multiple (e.g., 3) planetary gears 3 in the circumferential direction C. The axial ends of the inner peripheral wall of the planetary pin 5 can be chamfered to facilitate the flow of oil into the interior of the planetary pin 5.

[0063] The planetary carrier body 11 may be provided with a planetary pin oil inlet channel 13. One end (upstream end, radially inner end) of the planetary pin oil inlet channel 13 is connected to the annular oil chamber 15, and the other end (downstream end, radially outer end) of the planetary pin oil inlet channel 13 is connected to the hollow part of the planetary pin 5. The planetary pin oil inlet channel 13 may extend obliquely relative to the radial R and axial A of the planetary gearbox.

[0064] like Figure 4 and Figure 5 As shown, the planetary pin oil inlet channel 13 can be provided in multiple ways (e.g., 3 ways) along the circumferential C of the planetary gearbox.

[0065] The motor housing oil inlet 101 can be connected to the annular oil chamber 15, so that the planetary pin oil inlet channel 13 can be connected to the motor housing oil inlet 101 through the annular oil chamber 15. When the planetary gearbox is working normally, the planet carrier 1 rotates relative to the motor housing 100. When the planet carrier 1 rotates, the planetary pin oil inlet channel 13 also always remains connected to the motor housing oil inlet 101, so that oil can be continuously supplied to the planetary pin oil inlet channel 13.

[0066] Planetary gear 3 can be a double gear (stepped gear), comprising a major diameter gear 31 and a minor diameter gear 32, which are coaxially connected together. The gear ring G2 can be connected to the gearbox housing 8. The major diameter gear 31 can mesh with the sun gear G1, and the minor diameter gear 32 can mesh with the gear ring G2. Planetary gear washers 33 can be provided at both axial ends of the planetary gear 3, and the planetary gear washers 33 can be fitted onto the planetary pins.

[0067] like Figures 2 to 5 As shown, the planetary pin 5 may be provided with a bearing oil outlet 51, a differential gear oil outlet 52, and a minor diameter gear oil outlet 53. The bearing oil outlet 51, differential gear oil outlet 52, and minor diameter gear oil outlet 53 all penetrate the peripheral wall of the planetary pin 5. It is understood that these oil outlets may be located at different positions in the circumferential direction of the planetary pin 5; therefore, it is difficult to show all these oil outlets simultaneously in a single cross-sectional view. Figure 4 and Figure 5 The oil outlet and oil channel are represented in solid form for easy observation.

[0068] The bearing oil outlet 51 can be aligned with the gear bearing 4, the differential gear oil outlet 52 can be aligned with the meshing area of ​​the differential gear 7 and the side gear G3, and the small diameter gear oil outlet 53 can be aligned with the meshing area of ​​the small diameter gear 32 and the gear ring G2.

[0069] The planetary carrier 1 is provided with a planetary carrier bearing lubrication channel 16, one end (upstream end) of which can extend to one axial end of the gear bearing 4. Figure 2 and Figure 3 The other end (downstream end) of the planetary carrier bearing lubrication channel 16 can extend to the location of the planetary carrier bearing 14. Thus, after the oil flows through the gear bearing 4, it can flow to the planetary carrier bearing 14 through the planetary carrier bearing lubrication channel 16 to lubricate the planetary carrier bearing 14.

[0070] Reference Figure 2 and Figure 3 , Figure 2 and Figure 3 The unidirectional arrows indicate the direction of oil flow. Pressurized oil, supplied by an oil pump, enters the annular oil chamber 15 through the motor housing oil inlet 101, and then flows through the planetary pin oil inlet channel 13 to the interior of the planetary pin 5. It then flows through the bearing oil outlet 51 to the gear bearing 4, providing lubrication. From there, it flows axially to both sides to lubricate the planetary gear 3 and its end-plate planetary gears 33, before flowing to the meshing positions of the planet carrier bearing 14, the sun gear G1, and the major diameter gear 31. Figure 2 The left side of the planetary gear) and the meshing position of the gear ring G2 and the small diameter gear ( Figure 2The oil flows through the differential gear oil outlet 52 to the meshing position of the differential gear 7 and the side gear G3. It also flows through the minor diameter gear oil outlet 53 to the meshing position of the gear ring G2 and the minor diameter gear. The oil flows to the other axial end of the planetary pin 5. Figure 2 (From the right end of the middle) can flow to the planetary cover bearing 21.

[0071] like Figure 1 As shown, the differential pin 6 can be fixedly connected to the planetary carrier 1 and the planetary cover 2, and the differential gear 7 can be rotatably connected to the differential pin 6 relative to the planetary carrier 1 and the planetary cover 2. The differential pin 6 is used to support the differential gear 7, and the differential gear 7 can be sleeved on the differential pin 6. The differential pin 6 can be a hollow cylindrical shape. Multiple (e.g., 6) differential gears 7 can be provided along the circumferential direction C of the planetary gearbox. Differential gear shims 71 can be provided at both ends of the axial direction of the differential gear 7, and the differential gear shims 71 can be sleeved on the differential pin 6.

[0072] like Figure 2 As shown, the planetary cover 2 and the gearbox housing 8 can be connected by the planetary cover bearing 21, and the planetary cover 2 can rotate relative to the gearbox housing.

[0073] See Figure 1 , Figure 4 and Figure 5 The planetary carrier 1 may be provided with differential pin oil inlet channels, and multiple differential pin oil inlet channels may be provided along the circumference C of the planetary gearbox. One end (upstream end) of the differential pin oil inlet channel may be connected to the annular oil chamber 15, and the other end (downstream end) of the differential pin oil inlet channel may be connected to the differential pin 6.

[0074] Specifically, the differential pin oil inlet passages may include a first differential pin oil inlet passage 17, a second differential pin oil inlet passage 18, and a third differential pin oil inlet passage 19. The first differential pin oil inlet passage 17 can extend radially R along the planetary gearbox. One end (upstream end) of the first differential pin oil inlet passage 17 can be connected to the annular oil chamber 15, and the other end (downstream end) of the first differential pin oil inlet passage 17 can be connected to the second differential pin oil inlet passage 18. The second differential pin oil inlet passage 18 can extend axially A along the planetary gearbox. One end (downstream end) of the second differential pin oil inlet passage 18 can be connected to the third differential pin oil inlet passage 19. Multiple first differential pin oil inlet passages 17 (e.g., 3) and multiple second differential pin oil inlet passages 18 (e.g., 3) can be provided. One second differential pin oil inlet passage 18 can communicate with multiple (e.g., two) third differential pin oil inlet passages 19. The differential pin 6 can be a hollow cylindrical shape, and the third oil inlet channel 19 of the differential pin can extend into the interior of the differential pin 6.

[0075] See Figure 1, Figure 4 The first oil inlet passage 17 of the differential pin can extend generally along the radial direction R of the planetary gearbox. Here, "generally" means that the first oil inlet passage 17 extends approximately along the radial direction R of the planetary gearbox, but can be inclined to a certain extent relative to the radial direction R. In one example, the further outward the radial direction, the further the first oil inlet passage 17 is towards the opposite axial direction. Figure 1 , Figure 4 (The right side of the middle) is tilted.

[0076] The differential pin 6 may be provided with differential gear oil holes 61. The oil flowing out of the differential gear oil holes 61 can lubricate the connection between the differential pin 6 and the differential gear 7, and flows along the axial direction A towards both ends of the differential gear 7 and towards the differential gear shims 71. Multiple differential gear oil holes 61 may be provided along the axial direction A of the differential pin 6, and multiple differential gear oil holes 61 may be provided along the circumference of the differential pin 6.

[0077] The planetary cover 2 may be provided with a planetary cover bearing oil supply hole, which can be aligned with the planetary pin 5, so that the oil flowing out from the planetary pin 5 can flow to the planetary cover bearing 21 through the planetary cover bearing oil supply hole, providing lubrication for the planetary cover bearing 21.

[0078] Reference Figure 1 , Figure 1 The unidirectional arrows indicate the direction of oil flow. Pressurized oil is supplied by an oil pump through the motor housing inlet 101 into the annular oil chamber 15, flowing sequentially through the first differential pin inlet channel 17, the second differential pin inlet channel 18, and the third differential pin inlet channel 19 to the interior of the differential pin 6. Then, it flows through the differential gear oil hole 61 to the connection point between the differential pin 6 and the differential gear 7, and along the axial direction A towards both ends of the differential gear 7 towards the differential gear shim 71.

[0079] This application is not limited to the above embodiments. Those skilled in the art can make various modifications to the above embodiments of this application under the guidance of this application, without departing from the scope of this application. In addition, the following description is provided.

[0080] (1) The pressure oil is used to actively lubricate the parts that need lubrication, so it is not affected by the tilt of the gearbox and the amount of lubricating oil is easy to ensure. In addition, the use of active lubrication does not require the gears to stir the oil, so less oil is needed and the oil level can be lower, which can reduce the power loss caused by the gears stirring the oil in the planetary gearbox.

[0081] (2) The oil guide channel is located on the planetary carrier 1, planetary pin 5 and differential pin 6. The channel is easy to process and does not require additional parts to form the oil guide channel. It has a simple structure, low cost and high reliability.

[0082] It should be understood that at least some aspects or features of the above-described implementation methods, embodiments, or examples can be appropriately combined.

[0083] It is understood that, in this application, when the number of parts or components is not specifically limited, the number can be one or more, where multiple refers to two or more. For cases where the number of parts or components shown in the drawings and / or described in the specification is, for example, two, three, four, etc., this specific number is generally exemplary and not restrictive, and can be understood as multiple, i.e., two or more; however, this does not mean that this application excludes the case of one.

[0084] In this application, unless otherwise expressly stated or limited, terms such as "installation," "assembly," "connection," "linking," "joining," "linking," "abutment," "communication," "connection," "conduction," "fixing," and "fastening" should be interpreted broadly, for example, they can be direct or indirect. For instance, regarding connection, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise expressly stated or limited. For instance, regarding communication / conduction, it can be direct communication / conduction or indirect communication / conduction through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0085] In this application, unless otherwise expressly stated or limited, a component being disposed / installed / located / enclosed / placed within, inside, or within another component can be either of the following two situations: a portion or a majority of the one component is located within the other component; or the one component is completely enclosed within the other component.

[0086] Although the present application has been described in detail using the above embodiments, it will be apparent to those skilled in the art that the present application is not limited to the embodiments described herein. The present application can be modified and implemented as alternative embodiments without departing from the spirit and scope of the present application as defined by the claims. Therefore, the description in this specification is for illustrative purposes only and does not have any limiting meaning for the present application.

Claims

1. A planetary gearbox, characterized in that, include: Planetary carrier, wherein the planetary carrier is provided with planetary pin oil inlet channels; Planetary pin, which is a hollow cylindrical shape, is connected to the planet carrier. The planetary pin is provided with an oil outlet hole that penetrates the peripheral wall of the planetary pin. The planetary pin oil inlet channel is connected to the planetary pin and thus to the oil outlet hole. A gear bearing is fitted onto the planetary pin, and the oil inside the planetary pin can be guided to the gear bearing through the oil outlet hole; as well as Planetary gears, which are fitted onto the gear bearings.

2. The planetary gearbox according to claim 1, characterized in that, The planetary gearbox also includes: A differential pin, which is a hollow cylindrical shape, is connected to the planetary carrier. The differential pin has a differential gear oil hole that penetrates the peripheral wall of the differential pin. The differential gear is sleeved on the differential pin. The planetary carrier is provided with a differential pin oil inlet channel, which is connected to the differential pin.

3. The planetary gearbox according to claim 2, characterized in that, The planetary gearbox is connected to the motor housing, which has a bearing mounting portion. The planetary carrier includes a planetary carrier body and a bearing mating portion. The bearing mating portion is located radially inside the planetary carrier body. The bearing mounting portion and the bearing mating portion are connected by a planetary carrier bearing, allowing the planetary carrier to rotate relative to the motor housing. In the radial direction of the planetary gearbox, a sealing ring mounting groove is provided between the planetary carrier body and the bearing mounting portion. This groove is provided with at least two sealing rings, which are spaced apart axially along the planetary gearbox, thereby forming an annular oil cavity between the at least two sealing rings. The upstream end of the planetary pin oil inlet channel is connected to the annular oil chamber, and the upstream end of the differential pin oil inlet channel is connected to the annular oil chamber.

4. The planetary gearbox according to claim 3, characterized in that, The planetary carrier is provided with a planetary carrier bearing lubrication channel. The upstream end of the planetary carrier bearing lubrication channel extends to the axial end of the gear bearing, and the downstream end of the planetary carrier bearing lubrication channel extends to the location of the planetary carrier bearing.

5. The planetary gearbox according to claim 3, characterized in that, The differential pin oil inlet channels include a first differential pin oil inlet channel, a second differential pin oil inlet channel, and a third differential pin oil inlet channel. The upstream end of the first oil inlet channel of the differential pin is connected to the annular oil chamber. The downstream end of the first oil inlet channel of the differential pin is connected to the second oil inlet channel of the differential pin, and the downstream end of the second oil inlet channel of the differential pin is connected to the third oil inlet channel of the differential pin. The first oil inlet passage of the differential pin extends radially along the planetary gearbox. The second oil inlet passage of the differential pin extends axially along the planetary gearbox. The differential pin has multiple third oil inlet channels, and one differential pin second oil inlet channel and multiple differential pin third oil inlet channels are connected.

6. The planetary gearbox according to claim 2, characterized in that, The differential gear oil holes are provided in multiple ways along the axial direction of the differential pin and in multiple ways along the circumferential direction of the differential pin.

7. The planetary gearbox according to claim 1, characterized in that, Two gear bearings are provided on the same planetary pin, and a washer is provided between the two gear bearings. The oil supplied from the oil outlet to the outside of the planetary pin is separated by the washer and flows to both sides of the planetary pin in the axial direction.

8. The planetary gearbox according to claim 1, characterized in that, The planetary gearbox also includes a planetary cover that supports the planetary pin. The planetary cover is provided with a planetary cover bearing oil supply hole that is aligned with the planetary pin.

9. A vehicle powertrain system, characterized in that, It includes: Motor housing; as well as The planetary gearbox according to any one of claims 1 to 8.

10. The vehicle power system according to claim 9, characterized in that, It includes an oil pump for supplying oil to the planetary pin inlet channel.

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