Planetary row lubrication structure, hybrid electric drive assembly and vehicle

Abstract

The application discloses a planetary gear set lubricating structure, a hybrid electric drive assembly and a vehicle, and solves the technical problem of poor lubricating effect of the prior art. The planetary gear set lubricating structure provided by the application adopts an active lubricating scheme, the planetary gear set is provided with a lubricating channel, and the outlet of the lubricating channel faces the planetary gear bearing of the planetary gear set; the sun gear shaft of the planetary gear set is provided with a first hollow cavity penetrating in the axial direction, the planet carrier of the planetary gear set is provided with an oil collecting cavity, and the first hollow cavity, the oil collecting cavity and the lubricating channel are sequentially communicated, so that the lubricating oil circulates in the lubricating channel and finally flows to the planetary gear bearing, lubricates the bearings of the planetary gears, and avoids the safety problem of the whole vehicle caused by the ablation of the whole planetary gear set.

Description

Technical Field

[0001] This application belongs to the technical field of planetary gear transmission devices, specifically relating to a planetary gear lubrication structure, a hybrid electric drive assembly, and a vehicle. Background Technology

[0002] Planetary gear sets are key components for power distribution in current hybrid vehicles. Proper lubrication is crucial for their normal operation. However, in practice, improper lubrication design frequently leads to sintering of the entire planetary gear set. Sintering causes excessive surface pressure on the needle roller bearings, planetary gears, and sun gear shaft, ultimately resulting in tooth breakage and significant vibration, preventing power transmission and affecting vehicle performance. Therefore, a well-designed lubrication system for planetary gear sets is of paramount importance.

[0003] Current planetary gear set lubrication structures mostly employ oil-stirring lubrication. For example, the utility model patent "Planetary Gear Set Power System, Hybrid Power System and Vehicle" (publication number CN210686923U) discloses a planetary gear set power system, including an engine, an electric motor, a planetary gear set housing assembly, and a planetary gear set disposed within the planetary gear set housing assembly. One of the planet carrier, sun gear, and ring gear of the planetary gear set is connected to the engine, one to the electric motor, and one to the system output shaft. A transmission component connected to the ring gear is also connected to a lubrication pump, and a transmission component connected to the generator or electric motor is also connected to an oil-stirring component. Lubrication of the planetary gear set by the oil-stirring component solves the problem of poor lubrication performance in some operating modes. However, the oil-stirring lubrication scheme requires an additional oil-stirring component, resulting in a complex structure and poor lubrication effect at the planetary gears. Summary of the Invention

[0004] To solve the above-mentioned technical problems, this application provides a planetary gear lubrication structure, a hybrid electric drive assembly, and a vehicle, which have a simple structure and good lubrication effect.

[0005] The technical solution adopted to achieve the purpose of this application is a planetary gear set lubrication structure, wherein the planetary gear set is provided with a lubrication channel, the outlet of the lubrication channel is facing the planetary gear bearing of the planetary gear set; the sun gear shaft of the planetary gear set is provided with a first hollow cavity that runs through the axis; the planet carrier of the planetary gear set is provided with an oil collecting cavity, and the first hollow cavity, the oil collecting cavity and the lubrication channel are connected in sequence.

[0006] In some embodiments, the sun gear shaft and / or the planetary support are provided with hollow protrusions, and the first hollow cavity is connected to the oil collection cavity through the protrusions.

[0007] In some embodiments, the sun gear shaft has the protrusion at its end, and an intermediate bearing is provided between the planet carrier shaft of the planet carrier and the sun gear shaft, the intermediate bearing being sleeved on the protrusion.

[0008] In some embodiments, the end of the sun gear shaft is provided with a recessed bearing mounting groove, and the intermediate bearing is mounted in the bearing mounting groove.

[0009] In some embodiments, the planetary carrier includes a planetary carrier shaft, a connecting plate, and a planetary gear shaft connected in sequence. The planetary carrier shaft is provided with the oil collection chamber and a first oil guide hole that are connected in communication, and the planetary gear shaft is provided with a second oil guide hole.

[0010] An oil guide is provided on the outer side of the connecting plate, and the oil guide is sleeved on the outside of the planetary carrier shaft; the first oil guide hole, the gap between the oil guide and the connecting plate, and the second oil guide hole are connected in sequence to form the lubrication channel.

[0011] In some embodiments, the second oil guide hole includes an axial oil guide hole extending axially along the planetary gear shaft and at least one radial oil guide hole extending radially along the planetary gear shaft, the outlet of the radial oil guide hole constituting the outlet of the lubrication channel.

[0012] In some embodiments, the oil guide is annular, and the portion of the oil guide near the outer ring is in contact with the connecting plate and / or the planetary gear shaft.

[0013] In some embodiments, the oil guide includes a baffle portion near the inner ring and a flow guide portion near the outer ring, the baffle portion being parallel to the connecting plate and the flow guide portion being angled to the baffle portion.

[0014] In some embodiments, the oil guide member has a sealing edge parallel to the connecting plate, and the sealing edge is in close contact with the portion of the connecting plate located on the outer periphery of the planetary gear shaft.

[0015] In some embodiments, the planetary gear shaft is provided with at least one third oil guide hole communicating with the oil collecting chamber; the sun gear shaft is provided with at least one fourth oil guide hole communicating with the first hollow cavity.

[0016] In some embodiments, the planetary gear set further includes an internal gear ring shaft rotatably mounted on the sun gear shaft.

[0017] In some embodiments, a support bearing is installed between the sun gear shaft and the internal gear ring shaft, with the outlet of one of the fourth oil guide holes facing the support bearing.

[0018] In some embodiments, the internal gear ring of the planetary gear set and the internal gear ring shaft are integral structures; or, the internal gear ring of the planetary gear set and the internal gear ring shaft are fixed by welding or key connection.

[0019] Based on the same inventive concept, this application also provides a hybrid electric drive assembly, comprising:

[0020] The housing assembly is equipped with an oil inlet channel;

[0021] The aforementioned planetary gear lubrication structure is installed inside the housing assembly, and the first hollow cavity of the planetary gear lubrication structure is connected to the oil inlet channel.

[0022] In some embodiments, the hybrid electric drive assembly further includes a motor assembly connected to the housing assembly, wherein the rotor of the motor assembly has a second hollow cavity that extends axially, and the oil inlet channel, the second hollow cavity and the first hollow cavity are sequentially connected; the rotor of the motor assembly is keyed to the sun gear shaft.

[0023] In some embodiments, the housing assembly includes a right housing, a left housing, and an end cover connected in sequence. The right housing and the left housing together form a gear mounting cavity, and the left housing and the end cover together form a motor mounting cavity. The planetary gear set is located in the gear mounting cavity, and the motor assembly is located in the motor mounting cavity. The oil inlet channel is located in the end cover.

[0024] In some embodiments, a first planetary carrier bearing is mounted on the planetary carrier shaft, the first planetary carrier bearing being disposed between the planetary carrier and the right housing, and the first planetary carrier bearing being disposed in the lubrication channel;

[0025] And / or, a second planetary carrier bearing is mounted on the planetary carrier shaft, the second planetary carrier bearing being located between the planetary carrier and the right housing.

[0026] In some embodiments, the end cap is provided with a hollow oil guide ring that extends into the second hollow cavity.

[0027] Based on the same inventive concept, this application also provides a vehicle including the aforementioned hybrid electric drive assembly.

[0028] As can be seen from the above technical solution, the planetary gear set lubrication structure provided in this application adopts an active lubrication scheme. The planetary gear set is provided with a lubrication channel, and the outlet of the lubrication channel faces the planetary gear bearings of the planetary gear set. The sun gear shaft of the planetary gear set is provided with a first hollow cavity that runs through the axis, and the planet carrier of the planetary gear set is provided with an oil collecting cavity. The first hollow cavity, the oil collecting cavity and the lubrication channel are connected in sequence, so that the lubricating oil flows in the lubrication channel and finally flows to the planetary gear bearings to lubricate the bearings of each planetary gear and avoid the safety problems of the whole vehicle caused by the burning of the entire planetary gear set. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the planetary gear lubrication structure in Embodiment 1 of this application.

[0030] Figure 2 for Figure 1 A schematic diagram of the planetary gear set in the planetary gear set lubrication structure.

[0031] Figure 3 This is an overall structural diagram of the hybrid electric drive assembly in Embodiment 2 of this application.

[0032] Figure 4 for Figure 3 Diagram showing the connection structure between the oil inlet channel and the motor rotor in a hybrid electric drive assembly.

[0033] Figure 5 for Figure 3 A schematic diagram of the hybrid electric drive assembly after the right housing has been removed.

[0034] Figure 6 for Figure 3 A schematic diagram of the hybrid electric drive assembly after the end caps have been removed.

[0035] Explanation of reference numerals in the attached drawings: 20-oil guide component, 21-baffle part, 22-flow guide part, 23-sealing edge; 30-motor bearing; 40-planetary gear bearing; 50-first planetary carrier bearing; 60-second planetary carrier bearing; 70-support bearing; 80-intermediate bearing.

[0036] 100-Planetary gear set; 110-Sun gear shaft; 111-First hollow cavity; 112-Fourth oil guide hole; 113-Bearing mounting groove; 114-Protrusion; 120-Planet carrier; 121-Planet carrier shaft; 122-Connecting plate; 123-Planet gear shaft; 124-Oil collection cavity; 1241-Large hole section; 1242-Small hole section; 125-First oil guide hole; 126-Second oil guide hole; 1261-Axial oil guide hole; 1262-Radial oil guide hole; 127-Third oil guide hole; 130-Sun gear; 140-Planet gear; 150-Internal gear ring; 160-Lubrication channel.

[0037] 1000 - Hybrid electric drive assembly; 200 - Internal gear ring shaft; 300 - Housing assembly; 301 - Oil inlet channel; 302 - Shaft gear mounting cavity; 303 - Motor mounting cavity; 310 - Right housing; 320 - Left housing; 330 - End cover; 331 - Oil guide ring; 400 - Motor assembly; 410 - Rotor; 411 - Second hollow cavity; 500 - Gear shifting mechanism assembly; 600 - Intermediate shaft gear assembly; 700 - Differential assembly; 800 - Controller assembly. Detailed Implementation

[0038] To enable those skilled in the art to better understand this application, the technical solution of this application will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] Example 1:

[0040] This embodiment provides a planetary gear set lubrication structure that employs an active lubrication scheme. (See [link]). Figure 1 and Figure 2 The planetary gear set 100 is provided with a lubrication channel 160. Specifically, the lubrication channel 160 of the planet carrier 120 can be an oil passage formed in the base material of the planet carrier 120, or an oil passage formed by external components, as long as it can deliver lubricating oil to the mounting location of the planetary gear bearing 40. The sun gear shaft 110 of the planetary gear set 100 is provided with a first hollow cavity 111 that runs through the axial direction. The sun gear shaft 110 can be integrally formed with the sun gear 130 of the planetary gear set 100, or keyed. In this embodiment, the sun gear shaft 110 and the sun gear 130 are integrally formed. The planet carrier 120 of the planetary gear set 100 is provided with an oil collecting cavity 124. The first hollow cavity 111, the oil collecting cavity 124 and the lubrication channel 160 are sequentially connected, and the outlet of the lubrication channel 160 faces the planetary gear bearing 40 of the planetary gear set 100.

[0041] Production practice has revealed that the main lubrication requirement of the planetary gear set 100 lies in the planetary gear bearings 40. On the one hand, there are many planetary gear bearings 40, which are widely distributed. On the other hand, since the installation position of the planetary gear bearings 40 is located in the area enclosed by the planetary carrier 120 and between the planetary gears 140 and the planetary gear shaft 123, the lubricating oil is difficult to enter the installation position of the planetary gear bearings 40 due to the obstruction of the planetary gears 140 and the planetary carrier 120. As a result, the planetary gear bearings 40 are prone to burning, which affects the use of the entire planetary gear set 100. The planetary gear set lubrication structure provided in this embodiment provides a first hollow cavity 111 that runs through the sun gear shaft 110. Lubricating oil is transferred from the lubricating oil inlet at the far end of the planetary gear set to the planet carrier 120 of the planetary gear set 100. The lubricating oil enters the lubrication channel 160 through the oil collection cavity 124 of the planet carrier 120. The lubricating oil flows in the lubrication channel 160 and finally flows to the planet gear bearings 40 to lubricate the bearings of each planet gear 140, ensuring sufficient oil volume for the bearings and avoiding vehicle safety problems caused by the burning of the entire planetary gear set 100.

[0042] In this embodiment, the planetary gear bearing 40 is a needle roller bearing, specifically a full complement needle roller bearing or a steel cage needle roller bearing. The planetary gear bearing 40 is a double-row needle roller bearing with a spacer in the middle. The spacer is radially spaced from the planetary gear shaft 123 to ensure that lubricating oil can enter the needle roller bearing and lubricate the roller surface.

[0043] Due to axial manufacturing and machining errors in components such as the planet carrier 120 and sun gear shaft 110 of the planetary gear set 100, a certain gap usually exists between the sun gear shaft 110 and the planet carrier 120. Under certain extreme conditions, lubricating oil flowing into this part will leak out in large quantities through this gap. In related technologies, a common method to solve the above problem is to embed an oil guide pipe inside the sun gear shaft 110 to guide the oil in the sun gear shaft into the oil groove of the planet carrier. This can effectively solve the lubricating oil leakage problem, but it requires additional installation of an oil guide pipe and a bushing to fix the oil guide pipe.

[0044] In the planetary gear set lubrication structure provided in this embodiment, the sun gear shaft 110 and / or the planet carrier 120 are provided with hollow protrusions, and the first hollow cavity 111 and the oil collection cavity 124 are connected through the hollow cavity of the protrusions. By providing this protrusion, the lubricating oil in the sun gear shaft 110 can be directly introduced into the oil collection cavity 124 of the planet carrier 120, reducing leakage at the gap between the sun gear shaft 110 and the planet carrier 120, ensuring the lubricating oil quantity requirement of the downstream section, and thus ensuring sufficient oil quantity in the planetary gear bearing 40. After providing the protrusion, the mating gap between the sun gear shaft 110 and the planet carrier 120 becomes a curved path, and the curved gap can effectively prevent lubricating oil leakage. The provision of this protrusion ensures the lubrication requirements of all parts of the planetary gear set, and at the same time, compared with the above-mentioned related technologies, it also reduces the cost caused by adding oil guide pipes and the difficulties and risks of installation and arrangement caused by adding oil guide pipes.

[0045] The protrusion may be integrally formed on the sun gear shaft 110 and / or planet carrier 120, or it may be installed on the sun gear shaft 110 and / or planet carrier 120 by bonding, welding, or screwing. This application does not impose any limitations. See details. Figure 2 In this embodiment, the protrusion 114 is disposed on the sun gear shaft 110, specifically at the end of the sun gear shaft 110 near the oil collecting chamber 124. The first hollow cavity 111 extends axially, penetrating the body of the sun gear shaft 110 and the protrusion 114. The protrusion 114 extends into the oil collecting chamber 124, which can reduce the leakage of lubricating oil in the gap between the sun gear shaft 110 and the planet carrier 120. Considering that the lubricating oil can easily enter the lubrication channel 160, the end face of the protrusion 114 should have a certain distance from the inlet of the lubrication channel 160 along the axial direction of the sun gear shaft 110 to avoid blocking the inlet of the lubrication channel 160.

[0046] In this embodiment, an intermediate bearing 80 is provided between the planet carrier 120 and the sun gear shaft 110. The intermediate bearing 80 is located at the end of the sun gear shaft 110 and is fitted onto the protrusion 114. Lubricating oil can enter the intermediate bearing 80 through the gap between the protrusion 114 and the cavity wall of the oil collecting chamber 124 to lubricate the intermediate bearing 80.

[0047] In this embodiment, the intermediate bearing 80 is a thrust bearing, capable of withstanding large axial forces. The sun gear shaft 110 and the planet carrier 120 are connected via this thrust bearing. One end of the sun gear shaft 110 rests against the planet carrier shaft 121 of the planet carrier 120 via this thrust bearing. The thrust bearing can meet the operational requirements of the planetary gear set 100 under certain operating conditions where there is a speed difference between the planet carrier 120 and the sun gear shaft 110. For details, see... Figure 2The sun gear shaft 110 has a recessed bearing mounting groove 113 at its end, and the intermediate bearing 80 is installed in the bearing mounting groove 113. The planetary carrier shaft 121 has a raised center that abuts against the intermediate bearing 80.

[0048] Please see Figure 1 In this embodiment, the planetary carrier 120 includes a planetary carrier shaft 121, a connecting plate 122, and a plurality of planetary gear shafts 123 connected in sequence. Planetary gears 140 are fitted onto the planetary gear shafts 123. Planetary gear bearings 40 are installed between the planetary gears 140 and the planetary gear shafts 123. The two sides of the planetary gears 140 mesh with the gears of the sun gear 130 and the gears of the internal gear ring 150, respectively, through gears. The planetary carrier shaft 121 is located at the center of the connecting plate 122, and the planetary gear shafts 123 are evenly distributed circumferentially around the planetary carrier shaft 121. The planetary carrier shaft 121 and the connecting plate 122 can be detachably connected by threaded fasteners, snap-fit ​​structures, etc., or fixed by welding, or the planetary carrier shaft 121 and the connecting plate 122 can be an integral structure. In this embodiment, the planetary carrier shaft 121 is press-fitted onto the connecting plate 122. The connecting plate 122 and the planetary gear shaft 123 can also be detachably connected by threaded fasteners, snap-fit ​​structures, etc., or fixed by welding, or the connecting plate 122 and the planetary gear shaft 123 can be an integral structure, which is not limited in this application. The overall external shape and outline of the planetary carrier 120 are also not limited in this application. For example, the planetary carrier 120 can adopt a cage structure.

[0049] Specifically, the planetary carrier shaft 121 is provided with a connected oil collecting chamber 124 and a first oil guide hole 125. The oil collecting chamber 124 is located at the center of the planetary carrier shaft 121, preferably coaxial with the planetary carrier shaft 121. The first oil guide hole 125 should be as close as possible to the outlet of the protrusion 114. The planetary gear shaft 123 is provided with a second oil guide hole 126, the outlet of which faces the planetary gear bearing 40 of the planetary gear set 100. An oil guide member 20 is provided on the outer side of the connecting plate 122. The first oil guide hole 125, the gap between the oil guide member 20 and the connecting plate 122, and the second oil guide hole 126 are connected in sequence to form a lubrication channel 160. The oil guide member 20 guides the lubricating oil thrown out of the first oil guide hole 125 in the oil collecting chamber 124 under centrifugal force to the second oil guide hole 126.

[0050] The oil guide 20 is annular and is fitted around the planetary carrier shaft 121, specifically loosely fitted around the outer side of the planetary carrier shaft 121. The portion of the oil guide 20 near the outer ring is in contact with the connecting plate 122 and / or the planetary gear shaft 123, so that lubricating oil thrown towards the outer periphery of the planetary gear set 100 by centrifugal force is blocked by the oil guide 20 and collects on the inner side of the contact point between the oil guide 20 and the planetary gear shaft 123. Along the radial direction of the planetary gear set 100, the contact point between the oil guide 20 and the planetary gear shaft 123 should be located outside the inlet of the second oil guide hole 126, so that the lubricating oil collected on the inner side of the contact point between the oil guide 20 and the planetary gear shaft 123 can enter the second oil guide hole 126. For details, see... Figure 2 In this embodiment, the oil guide 20 is provided with a sealing edge 23 parallel to the connecting plate 122, and the sealing edge 23 is in close contact with the part of the connecting plate 122 located outside the planetary gear shaft 123.

[0051] See Figure 2 In this embodiment, the oil guide 20 includes a baffle portion 21 near the inner ring and a guide portion 22 near the outer ring. The baffle portion 21 is parallel to the connecting plate 122, and the guide portion 22 is angled to the baffle portion 21. Specifically, the inner surface of the guide portion 22 is inclined relative to both the axial and radial directions. The distance between the baffle portion 21 and the connecting plate 122 gradually decreases radially from the center outwards, which can guide the lubricating oil and ensure that as much lubricating oil as possible enters the second oil guide hole 126. The sealing edge 23 is located on the outer periphery of the guide portion 22 and is tightly fitted to the connecting plate 122. Specifically, the sealing edge 23 can be welded to the connecting plate 122 for sealing, or sealed with sealant, etc.

[0052] The second oil guide hole 126 can be a channel extending radially and / or axially along the planetary gear shaft 123, or it can be a channel extending circumferentially along the planetary gear shaft 123. That is, the second oil guide hole 126 can be an axial straight channel, a radial straight channel, an oblique straight channel, a curved channel, etc., and this application does not impose any limitations. Specifically, in this embodiment, the second oil guide hole 126 includes an axial oil guide hole 1261 extending axially along the planetary gear shaft 123 and at least one radial oil guide hole 1262 extending radially along the planetary gear shaft 123. The outlet of the radial oil guide hole 1262 constitutes the outlet of the lubrication channel 160. The number of radial oil guide holes 1262 is determined by the size of the planetary gear bearing 40, and is usually set to two or more. The outlets of the two or more radial oil guide holes 1262 are spaced apart and evenly distributed along the circumferential surface of the planetary gear shaft 123. For example, the second oil guide hole 126 includes an axial oil guide hole 1261 extending axially along the planetary gear shaft 123 and four radial oil guide holes 1262 extending radially along the planetary gear shaft 123. The four radial oil guide holes 1262 are distributed at 90° to each other to ensure that the oil reaches the planetary gear bearing 40 and to avoid the entire planetary gear set 100 from sintering due to insufficient lubrication of the planetary gear bearing 40. In some embodiments, the inlet of the axial oil guide hole 1261 is set as a flared opening, preferably a circular flared opening, to reduce flow resistance. Along the axial direction of the planetary gear shaft 123, the diameter of the flared opening gradually increases from the middle to the end, which facilitates the entry of lubricating oil into the axial oil guide hole 1261.

[0053] In some embodiments, a first planetary carrier bearing 50 is mounted on the planetary carrier 120. The first planetary carrier bearing 50 is disposed in a lubrication channel 160, and the internal clearance of the first planetary carrier bearing 50 communicates with the lubrication channel 160 to allow lubricating oil to flow. See also Figure 1 and Figure 2 The first planetary carrier bearing 50 is mounted on the planetary carrier shaft 121 and is close to the connecting plate 122 of the planetary carrier 120. The first planetary carrier bearing 50 is a thrust bearing. The loose ring of the thrust bearing contacts the connecting plate 122, and the tight ring of the thrust bearing is connected to and / or in contact with an external fixing component (e.g., the housing assembly 300 for mounting the planetary gear set 100), thereby axially stabilizing the planetary gear set. A channel for lubricating oil flow is formed between the loose and tight rings, and the lubricating oil also lubricates the rollers of the thrust bearing as it flows between them. Of course, in other embodiments, the first planetary carrier bearing 50 can be positioned at other locations on the planetary carrier 120, completely separated from the lubrication channel 160, to avoid flow resistance generated by the internal structure of the first planetary carrier bearing 50.

[0054] In some embodiments, to improve the rotational stability of the planetary carrier 120, a second planetary carrier bearing 60 is also installed on the planetary carrier shaft 121. The second planetary carrier bearing 60 is a needle roller bearing, for example, the planetary carrier 120 is mounted in the housing assembly 300 (specifically the right housing 310) via the second planetary carrier bearing 60. The second planetary carrier bearing 60 also requires lubrication during operation. For this purpose, the planetary carrier shaft 121 is provided with a third oil guide hole 127 communicating with the oil collection chamber 124, and the outlet of the third oil guide hole 127 faces the second planetary carrier bearing 60. In general, the oil collection chamber 124 is required to accommodate the end of the oil guide tube 10 near the planetary set 100 and store a certain amount of oil to be delivered to the third oil guide hole 127. Considering that the second planetary carrier bearing 60 requires less lubricating oil than the planetary gear bearing 40, in order to ensure sufficient oil supply to the planetary gear bearing 40, in some embodiments, the oil collecting chamber 124 has a stepped hole structure, with its large hole section 1241 used to accommodate the end of the oil guide pipe 10 near the planetary gear set 100, and the small hole section 1242 connected to the third oil guide hole 127.

[0055] Considering that several bearings are typically installed on the drive shaft (sun gear shaft 110, planet carrier shaft 121, or internal gear ring shaft 200) of the planetary gear set 100, in order to meet the lubrication requirements of these bearings, in some embodiments, the sun gear shaft 110 is provided with several fourth oil guide holes 112, which communicate with the first hollow cavity 111. The several fourth oil guide holes 112 are distributed at intervals along the axial and / or radial direction of the sun gear shaft 110. Multiple fourth oil guide holes 112 located at the same axial position can also be provided, and these multiple fourth oil guide holes 112 located at the same axial position are distributed at intervals along the circumference, allowing oil to flow out evenly from the first hollow cavity 111 of the sun gear shaft 110 to lubricate the external components of the sun gear shaft 110.

[0056] Specifically, in this embodiment, the planetary gear set 100 also includes an internal gear ring shaft 200 rotatably mounted on the sun gear shaft 110. The internal gear ring 150 of the planetary gear set 100 is fixedly connected to the internal gear ring shaft 200. Specifically, the internal gear ring 150 can be integrally formed on the internal gear ring shaft 200, or the internal gear ring 150 can be welded, keyed, or press-fitted to the main body of the internal gear ring shaft 200. Several structures need to be installed on the internal gear ring shaft 200, therefore, several oil holes are also provided in the internal gear ring shaft 200. The internal gear ring shaft 200 needs to rotate during operation, therefore, the internal gear ring shaft 200 also needs to be equipped with bearings. These bearings can be mounted on the outer circumference of the internal gear ring shaft 200 or embedded in the inner circumference of the internal gear ring shaft 200.

[0057] See Figure 1In this embodiment, one or more support bearings 70 are installed between the sun gear shaft 110 and the internal gear ring shaft 200. The inner ring of the support bearing is sleeved on the sun gear shaft 110, and the internal gear ring shaft 200 is sleeved on the outer ring of the support bearing. The support bearing 70 is opposite to the outlet of the corresponding fourth oil guide hole 112, and lubricating oil is provided to lubricate the support bearing 70 through the fourth oil guide hole 112.

[0058] Therefore, in the planetary gear set lubrication structure provided in this application embodiment, the lubricating oil pumped in by an external oil pump (e.g., an electronic oil pump) first enters the first hollow cavity 111 of the planetary gear set 100, and lubricates several structures outside the sun gear shaft 110, such as the support bearing 70, through the fourth oil guide hole 112. The remaining lubricating oil is then distributed according to… Figure 2 The lubricating oil enters the oil collecting chamber 124 in the direction indicated by the middle arrow. The lubricating oil in the oil collecting chamber 124 mainly enters the lubrication channel 160, with a small amount flowing out from the third oil guide hole 127 to lubricate the second planetary carrier bearing 60. The lubricating oil entering the lubrication channel 160 flows outward under the action of oil pressure and centrifugal force, and collects at the root of the gap between the oil guide component 20 and the connecting plate 122. The collected lubricating oil finally enters the second oil guide hole 126 of the planetary gear shaft 123. The lubricating oil flowing into the second oil guide hole 126 flows radially along the oil guide hole 1262 into the planetary gear bearing 40 under the action of centrifugal force, lubricating and cooling the planetary gear bearing 40. During the operation of the planetary gear set 100, the lubricating oil flowing to the planetary gear bearing 40 can also flow to the meshing point of the planetary gear 140 with the internal gear ring 150 and the sun gear 130, fully lubricating the entire planetary gear set 100.

[0059] Example 2:

[0060] Based on the same inventive concept, this embodiment provides a hybrid electric drive assembly 1000, see [link to previous document]. Figures 3 to 6 The hybrid electric drive assembly 1000 includes a housing assembly 300 and the planetary gear lubrication structure of Embodiment 1 described above. The housing assembly 300 is provided with an oil inlet channel 301, the planetary gear lubrication structure is installed inside the housing assembly 300, and the first hollow cavity 111 of the planetary gear lubrication structure is connected to the oil inlet channel 301 of the housing assembly 300.

[0061] The hybrid electric drive assembly 1000 also includes a motor assembly 400, which may include a generator and / or a drive motor as needed. The motor assembly 400 is connected to the housing assembly 300 and can be installed inside the housing assembly 300 or located outside the housing assembly 300. In this embodiment, the motor assembly 400 is encapsulated within the housing assembly 300, and the lubricating oil introduced through the oil inlet channel 301 of the housing assembly 300 can also be used to cool the stator of the motor assembly 400. Typically, for independently operating motors, a cooling cavity needs to be provided in the motor housing to circulate a cooling medium to cool the motor stator. In this embodiment, since the motor assembly 400 is encapsulated within the housing assembly 300, there is no need for the motor housing required for an independent motor, simplifying the motor structure, reducing the weight of the hybrid electric drive assembly 1000, and improving the integration and vehicle compatibility of the hybrid electric drive assembly 1000.

[0062] Specifically, in this embodiment, the rotor 410 of the motor assembly 400 is provided with a second hollow cavity 411 that runs through the axis. The oil inlet channel 301, the second hollow cavity 411 and the first hollow cavity 111 are connected in sequence. The rotor 410 of the motor assembly 400 is coaxially arranged with the planetary gear set 100. The lubricating oil introduced by the oil inlet channel 301 of the housing assembly 300 is introduced into the first hollow cavity 111 of the planetary gear set 100 through the second hollow cavity 411. By connecting the rotor 410 of the motor assembly 400 and the internal oil circuit of the planetary gear set 100 in series, the rotor of the motor acts as a pipeline for lubricating oil, which simplifies the structure of the lubrication system and improves the integration and vehicle compatibility of the hybrid electric drive assembly 1000.

[0063] Since the second hollow cavity 411 and the first hollow cavity 111 are responsible for providing lubrication to the planetary gear set 100, they also provide cooling oil to the motor, lubricating oil to the bearings 30 of the motor rotor, lubricating the support bearings of the sun gear shaft 110 and the internal gear ring shaft 200, and lubricating oil to the synchronizer splines and needle roller bearings mounted on the outside of the internal gear ring shaft 200. Because the planetary gear set 100 is located far from the oil inlet channel 301, the lubricating oil needs to be supplied with the flow power by an oil pump, such as an electronic oil pump or a mechanical oil pump. The oil pump can be located inside or outside the housing assembly 300. Of course, in some embodiments, other oil pumps, such as the engine's oil pump, can also be used to provide the pumping pressure.

[0064] In this embodiment, the housing assembly 300 includes a right housing 310, a left housing 320, and an end cap 330 connected in sequence. The right housing 310 and the left housing 320 together form a gear mounting cavity 302, in which the planetary gear set 100 is located. The left housing 320 and the end cap 330 together form a motor mounting cavity 303, in which the motor assembly 400 is located. See details below. Figure 4 The planetary carrier shaft 121 is supported on the right housing 310 by a first planetary carrier bearing 50 and a second planetary carrier bearing 60. The sun gear shaft 110 is supported by two support bearings 70, which are installed in the inner bore of the internal gear ring shaft 200. The end of the sun gear shaft 110 abuts against the planetary carrier shaft 121 by an intermediate bearing 80. The rotor 410 of the motor assembly 400 has a bushing structure. The rotor 410 is connected to the sun gear shaft 110 by a spline. The rotor 410 is supported on the left housing 320 and the end cover 330 by two motor bearings 30.

[0065] The oil inlet channel 301 is located in the end cover 330, and the bottom of the left housing 320 forms an oil pan. The lubricating oil after lubricating the planetary gear set 100 falls into the oil pan. The external oil pump provides the pumping power, so that the lubricating oil circulates in the oil pan, the oil inlet channel 301, the second hollow cavity 411, the first hollow cavity 111, and the lubrication channel 160.

[0066] See Figure 4 In some embodiments, an oil guide ring 331 is integrated on the end cover 330. The oil guide ring 331 is a hollow structure protruding from the inner surface of the end cover 330. The oil guide ring 331 extends into the second hollow cavity 411 of the rotor 410 of the motor assembly 400, and there is a gap between the oil guide ring 331 and the cavity wall of the second hollow cavity 411. Since the housing assembly 300 is stationary during operation, while the rotor 410 of the motor assembly 400 needs to rotate at high speed under certain operating conditions, the oil guide ring 331 facilitates the flow of oil between the "stationary oil passage and the moving shaft".

[0067] In some embodiments, the hybrid electric drive assembly 1000 further includes a shift mechanism assembly 500, an intermediate shaft gear assembly 600, a differential assembly 700, and a controller assembly 800. The shift mechanism assembly 500, intermediate shaft gear assembly 600, and differential assembly 700 are all located in the shaft gear mounting cavity 302. The shift mechanism assembly 500 and intermediate shaft gear assembly 600 cooperate with the planetary gear set 100 to realize gear shifting and transmission functions. Power is output to the wheel axle system by the differential assembly 700. The controller assembly 800 is mounted outside the housing assembly 300 and is used to control the operation of the motor assembly 400 and / or the shift mechanism assembly 500. The controller assembly 800 can also control the operation of the oil pump and some electronic devices such as sensors (temperature sensors, pressure sensors, etc.) installed inside the hybrid electric drive assembly 1000. For details regarding the gear shifting mechanism assembly 500, the intermediate shaft gear assembly 600, and the controller assembly 800, please refer to the relevant public disclosures in the prior art; they will not be elaborated upon here.

[0068] In summary, since the hybrid electric drive assembly 1000 of this embodiment is equipped with the planetary gear lubrication structure of Embodiment 1, it has all the technical effects of the planetary gear lubrication structure of Embodiment 1. Furthermore, based on the structural design of the housing assembly 300 and the motor assembly 400 in the hybrid electric drive assembly 1000 of this embodiment, the hybrid electric drive assembly 1000 of this embodiment also has the advantages of high integration, high reliability, and high vehicle compatibility.

[0069] Example 3:

[0070] Based on the same inventive concept, this embodiment provides a vehicle including the hybrid electric drive assembly 1000 of Embodiment 2. The specific structure of the hybrid electric drive assembly 1000 is the same as that of Embodiment 2. Since the hybrid electric drive assembly 1000 adopts all the technical solutions of Embodiment 2, it has at least all the beneficial effects brought about by the technical solutions of Embodiment 2, which will not be described in detail here.

[0071] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0072] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A planetary gear set lubrication structure, characterized in that: The planetary gear set is provided with a lubrication channel, the outlet of which faces the planetary gear bearing of the planetary gear set; the sun gear shaft of the planetary gear set is provided with a first hollow cavity that extends axially; the planet carrier of the planetary gear set is provided with an oil collection cavity, and the first hollow cavity, the oil collection cavity, and the lubrication channel are connected in sequence. The sun gear shaft and / or the planet carrier are provided with hollow protrusions, and the first hollow cavity is connected to the oil collection cavity through the hollow cavity of the protrusions; the protrusions directly guide the lubricating oil in the sun gear shaft into the oil collection cavity, and the mating gap between the sun gear shaft and the planet carrier becomes a curved path; the inlet of the lubrication channel is close to the outlet of the protrusions.

2. The planetary gear set lubrication structure as described in claim 1, characterized in that: The sun gear shaft has the protrusion at its end, and an intermediate bearing is provided between the planet carrier shaft and the sun gear shaft, with the intermediate bearing sleeved on the protrusion.

3. The planetary gear set lubrication structure as described in claim 2, characterized in that: The end of the sun gear shaft is provided with a recessed bearing mounting groove, and the intermediate bearing is installed in the bearing mounting groove.

4. The planetary gear set lubrication structure as described in any one of claims 1-3, characterized in that: The planetary carrier includes a planetary carrier shaft, a connecting plate, and a planetary gear shaft connected in sequence. The planetary carrier shaft is provided with the oil collection chamber and a first oil guide hole that are connected in series, and the planetary gear shaft is provided with a second oil guide hole. An oil guide is provided on the outer side of the connecting plate, and the oil guide is sleeved on the outside of the planetary carrier shaft; the first oil guide hole, the gap between the oil guide and the connecting plate, and the second oil guide hole are connected in sequence to form the lubrication channel.

5. The planetary gear set lubrication structure as described in claim 4, characterized in that: The second oil guide hole includes an axial oil guide hole extending along the axial direction of the planetary gear shaft and at least one radial oil guide hole extending radially along the planetary gear shaft, the outlet of the radial oil guide hole constituting the outlet of the lubrication channel.

6. The planetary gear set lubrication structure as described in claim 4, characterized in that: The oil guide is annular, and the portion of the oil guide near the outer ring is in contact with the connecting plate and / or the planetary gear shaft.

7. The planetary gear set lubrication structure as described in claim 6, characterized in that: The oil guide includes a baffle portion near the inner ring and a flow guide portion near the outer ring. The baffle portion is parallel to the connecting plate, and the flow guide portion is set at an angle to the baffle portion.

8. The planetary gear set lubrication structure as described in claim 6, characterized in that: The oil guide component has a sealing edge parallel to the connecting plate, and the sealing edge is in close contact with the portion of the connecting plate located on the outer periphery of the planetary gear shaft.

9. The planetary gear set lubrication structure as described in claim 4, characterized in that: The planetary gear shaft is provided with at least one third oil guide hole communicating with the oil collection chamber; the sun gear shaft is provided with at least one fourth oil guide hole communicating with the first hollow cavity.

10. The planetary gear set lubrication structure as described in claim 9, characterized in that: The planetary gear set also includes an internal gear ring shaft rotatably mounted on the sun gear shaft.

11. The planetary gear set lubrication structure as described in claim 10, characterized in that: A support bearing is installed between the sun gear shaft and the internal gear ring shaft, with the outlet of one of the fourth oil guide holes facing the support bearing.

12. The planetary gear set lubrication structure as described in claim 10, characterized in that: The internal gear ring of the planetary gear set and the internal gear ring shaft are integral structures; or, the internal gear ring of the planetary gear set and the internal gear ring shaft are fixed by welding or key connection.

13. A hybrid electric drive assembly, characterized in that, include: The housing assembly is equipped with an oil inlet channel; The planetary gear lubrication structure according to any one of claims 1-12 is installed inside the housing assembly, and the first hollow cavity of the planetary gear lubrication structure is in communication with the oil inlet channel.

14. The hybrid electric drive assembly as described in claim 13, characterized in that: The hybrid electric drive assembly also includes a motor assembly connected to the housing assembly. The rotor of the motor assembly has a second hollow cavity that extends axially. The oil inlet channel, the second hollow cavity, and the first hollow cavity are connected in sequence. The rotor of the motor assembly is keyed to the sun gear shaft.

15. The hybrid electric drive assembly as described in claim 14, characterized in that: The housing assembly includes a right housing, a left housing, and an end cover connected in sequence. The right housing and the left housing together form a gear mounting cavity, and the left housing and the end cover together form a motor mounting cavity. The planetary gear set is located in the gear mounting cavity, and the motor assembly is located in the motor mounting cavity. The oil inlet channel is located in the end cap.

16. The hybrid electric drive assembly as described in claim 15, characterized in that: A first planetary carrier bearing is mounted on the planetary carrier shaft. The first planetary carrier bearing is located between the planetary carrier and the right housing, and is located in the lubrication channel. And / or, a second planetary carrier bearing is mounted on the planetary carrier shaft, the second planetary carrier bearing being located between the planetary carrier and the right housing.

17. The hybrid electric drive assembly as described in claim 15, characterized in that: The end cap is provided with a hollow oil guide ring, which extends into the second hollow cavity.

18. A vehicle, characterized in that: The hybrid electric drive assembly included in any one of claims 13-17.

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