WO2024087599A1

WO2024087599A1 - Planetary row lubrication structure, hybrid electric drive assembly, and vehicle

Info

Publication number: WO2024087599A1
Application number: PCT/CN2023/095709
Authority: WO
Inventors: 付丽; 刘宏; 聂少文; 雷君; 刘欢
Original assignee: 东风汽车集团股份有限公司
Priority date: 2022-10-24
Filing date: 2023-05-23
Publication date: 2024-05-02
Also published as: CN115638239A

Abstract

A planetary row lubrication structure, a hybrid electric drive assembly, and a vehicle. The planetary row lubrication structure comprises: a planetary row (100), the planetary row (100) being provided with a lubrication channel (160), a sun gear shaft (110) of the planetary row (100) being provided with a first hollow cavity (111) penetrating the sun gear shaft (110) in the axial direction thereof, a planet carrier (120) of the planetary row (100) being provided with an oil collection cavity (124), and the first hollow cavity (111), the oil collection cavity (124), and the lubrication channel (160) of the planetary row (100) sequentially being in communication with one another; and an oil guide pipe (10), penetratingly mounted in the interior of the sun gear shaft (110) of the planetary row (100).

Description

A planetary gear lubrication structure, hybrid electric drive assembly and vehicle

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to Chinese patent application No. 202211306023.6 filed on October 24, 2022, the entire contents of which are incorporated herein by reference.

Technical Field

The present invention belongs to the technical field of planetary gear transmission devices, and in particular relates to a planetary gear lubrication structure, a hybrid electric drive assembly and a vehicle.

Background technique

The planetary gearbox is the main power distribution component of the current hybrid vehicle model. The lubrication of the planetary gearbox is an important condition to ensure the normal operation of the planetary gearbox. In actual use, the problem of sintering of the entire planetary gearbox often occurs due to unreasonable lubrication structure design. The sintering of the planetary gearbox will cause excessive local surface pressure of the needle bearing, planetary gear and sun gear shaft, and eventually break teeth and form huge vibrations. The vehicle power cannot be transmitted, affecting the vehicle's driving. Therefore, the reasonable design of the lubrication structure of the planetary gearbox is of great significance.

The current planetary gear lubrication structure mostly adopts the solution of stirring oil lubrication. For example, the Chinese utility model patent "Planetary Gear Power System, Hybrid Power System and Vehicle" with publication number CN210686923U discloses a planetary gear power system, which includes an engine, a motor, a planetary gear housing assembly and a planetary gear arranged in the planetary gear housing assembly; one of the planetary gear carrier, sun gear and ring gear is connected to the engine, one is connected to the motor, and one is connected to the system output shaft; the transmission member connected to the ring gear is also connected to the lubrication pump, and the transmission member connected to the generator or motor is also connected to the stirring oil member. The planetary gear is lubricated by the stirring oil member, thereby solving the problem of poor lubrication performance of the planetary gear in some working modes. However, the stirring oil lubrication solution requires the additional setting of a stirring oil member, which leads to a complex structure and poor lubrication effect at the planetary gear.

Summary of the invention

In order to solve the above technical problems, the present disclosure provides a planetary gear lubrication structure, a hybrid electric drive assembly and a vehicle, which have a simple structure and good lubrication effect.

The technical solutions adopted to achieve the purpose of this disclosure are as follows:

According to a first aspect of an embodiment of the present disclosure, a planetary gear lubrication structure is provided, comprising: a planetary gear, provided with a lubrication channel, the outlet of the lubrication channel facing the planetary wheel bearings of the planetary gear; the sun gear shaft of the planetary gear is provided with a first hollow cavity extending axially therethrough, the planetary carrier of the planetary gear is provided with an oil collecting chamber, the first hollow chamber, the oil collecting chamber and the lubrication channel are connected in sequence; an oil guide pipe is installed in the first hollow cavity through which the end near the planetary gear extends into the oil collecting chamber.

According to a second aspect of an embodiment of the present disclosure, a hybrid electric drive assembly is provided, comprising: a housing assembly, provided with an oil inlet passage; the above-mentioned 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 passage.

According to a third aspect of an embodiment of the present disclosure, a vehicle is provided, comprising the hybrid electric drive assembly described above.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present disclosure, and those skilled in the art can obtain other drawings based on these drawings without creative work.

In order to more fully understand the present disclosure and its beneficial effects, the following will be described in conjunction with the accompanying drawings. The same reference numerals in the drawings represent the same parts.

FIG1 is a schematic structural diagram of a planetary gearbox lubrication structure according to some embodiments of the present disclosure;

FIG2 is a schematic diagram of the structure of a planetary gearbox of a planetary gearbox lubrication structure according to some embodiments of the present disclosure;

FIG3 is a schematic structural diagram of a planetary gear lubrication structure according to other embodiments of the present disclosure;

FIG4 is an overall structural diagram of a hybrid electric drive assembly according to some embodiments of the present disclosure;

FIG5 is a schematic diagram of the structure of the hybrid electric drive assembly of FIG4 after the right housing is removed; and

FIG. 6 is a schematic diagram of the structure of the hybrid electric drive assembly of FIG. 4 with the end cover removed.

Explanation of the reference numerals: 10 - oil guide pipe, 11 - oil outlet hole, 12 - oil outlet port, 13 - external spline; 20 - oil guide member; 30 - bushing; 40 - planetary gear bearing; 50 - first planetary carrier bearing; 60 - second planetary carrier bearing; 70 - support bearing; 80 - intermediate bearing; 90 - mechanical pump, 91 - rotor, 92 - flat mouth.
100-planetary row; 110-sun gear shaft, 111-first hollow cavity, 1111-oil storage cavity, 1112-expanding section, 112-fourth oil guide hole, 113-bearing mounting groove; 120-planet carrier, 121-planet carrier shaft, 122-connecting plate, 123-planetary gear shaft, 124-oil collecting 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-inner gear ring; 160-lubrication channel; 170-inner spline.
1000-hybrid electric drive assembly; 200-inner gear ring shaft. 300-housing assembly; 301-oil inlet channel; 302-shaft gear installation cavity; 303-motor installation cavity; 310-right housing; 320-left housing; 330-end cover. 400-motor assembly; 410-rotor, 411-second hollow cavity. 500-shift mechanism assembly; 600-intermediate shaft gear assembly; 700-differential assembly; 800-controller assembly.

Detailed ways

The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present disclosure.

FIG. 1 is a schematic diagram of the structure of a planetary gearbox lubrication structure according to some embodiments of the present disclosure; FIG. 2 is a schematic diagram of the structure of a planetary gearbox lubrication structure according to some embodiments of the present disclosure.

According to the first aspect of the present disclosure, a planetary gear lubrication structure is provided, which adopts an active lubrication scheme. Referring to FIG. 1 and FIG. 2 , the planetary gear lubrication structure may include a planetary gear 100 and an oil guide pipe 10. The planetary gear 100 is provided with a lubrication channel 160, and the sun gear shaft 110 of the planetary gear 100 is provided with a first hollow cavity 111 that penetrates along the axial direction. The sun gear shaft 110 may be integrally formed with the sun gear 130 of the planetary gear 100, or key-connected. In some embodiments, the sun gear shaft 110 may be integrally formed with the sun gear 130. The planet carrier 120 of the planetary gear 100 is provided with an oil collecting chamber 124, and the first hollow cavity 111, the oil collecting chamber 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 100. The oil guide pipe 10 is installed through the sun gear shaft 110 of the planetary gear row 100 . In some embodiments, the oil guide pipe 10 can be installed through the first hollow cavity 111 , and the end of the oil guide pipe 10 near the planetary gear row 100 extends into the oil collecting cavity 124 .

Production practice has found that the main lubrication requirement of the planetary gear row 100 lies in the planetary wheel bearings 40. On the one hand, the planetary wheel bearings 40 are numerous and widely distributed. On the other hand, since the installation position of the planetary wheel bearings 40 is located in the area surrounded by the planetary carrier 120 and between the planetary wheel 140 and the planetary wheel shaft 123, it is difficult for lubricating oil to enter the installation position of the planetary wheel bearings 40 due to the obstruction of the planetary wheel 140 and the planetary carrier 120. Therefore, the planetary wheel bearings 40 are prone to ablation, affecting the use of the entire planetary gear row 100. According to some embodiments of the present disclosure, the planetary gear lubrication structure is provided with an oil guide pipe 10. When the axial oil guide channel is relatively long, the oil guide pipe 10 is used to transfer the lubricating oil from the lubricating oil inlet at the far end of the planetary gear 100 to the planetary carrier 120 of the planetary gear 100, so as to avoid the situation where the oil is thrown out and cannot reach the planetary gear 100 due to the centrifugal force formed by the high-speed operation of the sun gear shaft 110, and the near planetary gear end of the oil guide pipe 10 extends into the oil collecting chamber 124, which can reduce the leakage of the lubricating oil at the gap between the sun gear shaft 110 and the planetary carrier 120. The lubricating oil circulates in the lubrication channel 160 and finally flows to the planetary gear bearing 40 to lubricate the bearings of each planetary gear 140, ensure sufficient oil in the bearing, and avoid the safety problem of the whole vehicle caused by the ablation of the entire planetary gear 100.

In some embodiments, the lubrication channel 160 of the planet carrier 120 may be an oil channel opened in the base material of the planet carrier 120. It can also be an oil passage formed by external components, which can deliver lubricating oil to the installation position of the planetary gear bearing 40. In some embodiments, the planetary gear bearing 40 is a needle bearing, and in some embodiments, it can be a full needle bearing or a steel cage needle bearing. The planetary gear bearing 40 adopts a double-row needle bearing, with a gasket in the middle. The gasket should form a gap with the planetary gear shaft 123 in the radial direction to ensure that the lubricating oil can enter the needle bearing and lubricate the roller surface of the needle bearing.

As shown in FIG1 , in some embodiments, the planet carrier 120 may include a planet carrier shaft 121, a connecting plate 122, and a plurality of planetary gear shafts 123 connected in sequence; the planetary gear 140 is sleeved on the planetary gear shaft 123, and a planetary gear bearing 40 is installed between the planetary gear 140 and the planetary gear shaft 123, and the two sides of the planetary gear 140 are respectively meshed with the gear of the sun gear 130 and the gear of the inner gear ring 150 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 along the circumference with the planetary carrier shaft 121 as the center. 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 are an integrated structure; in some embodiments, the planetary carrier shaft 121 is pressed on the connecting plate 122 by interference fit. The connecting plate 122 and the planetary gear shaft 123 can also be detachably connected by threaded fasteners, snap-fit structures, etc., or welded and fixed, or the connecting plate 122 and the planetary gear shaft 123 are an integrated structure, which is not limited in the present disclosure. The overall external shape and profile of the planetary carrier 120 are also not limited in the present disclosure, for example, the planetary carrier 120 can adopt a cage structure.

In some embodiments, the planet carrier shaft 121 may be provided with a connected oil collecting chamber 124 and a first oil guide hole 125, and the oil collecting chamber 124 is located at the center of the planet carrier shaft 121; in some embodiments, it may be coaxial with the planet carrier shaft 121. The planetary wheel shaft 123 is provided with a second oil guide hole 126, and the outlet of the second oil guide hole 126 faces the planetary wheel bearing 40 of the planetary gear 100. An oil guide member 20 is provided on the outer side of the connecting plate 122, and 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 in the oil collecting chamber 124 that is thrown out of the first oil guide hole 125 under the action of centrifugation to the second oil guide hole 126.

In some embodiments, an intermediate bearing 80 may be provided between the planet carrier shaft 121 and the sun gear shaft 110. The intermediate bearing 80 is a thrust bearing and can withstand a large axial force. One end of the sun gear shaft 110 is against the planet carrier shaft 121 through the thrust bearing. The thrust bearing can meet the working requirements of the planetary gear 100 under some working conditions that there is a speed difference between the planet carrier 120 and the sun gear shaft 110. The intermediate bearing 80 may be located at the end of the sun gear shaft 110; in some embodiments, an inwardly concave bearing mounting groove 113 may be provided at the end of the sun gear shaft 110; the bearing mounting groove 113 is connected to the first hollow cavity 111, thereby making the internal gap of the intermediate bearing 80 connected to the first hollow cavity 111, and the lubricating oil in the first hollow cavity 111 can enter the intermediate bearing 80.

As shown in FIG. 2 , the intermediate bearing 80 can be sleeved outside the oil guide tube 10, that is, the intermediate bearing 80 has a certain axial distance from the oil outlet of the oil guide tube 10. The sun gear shaft 110 and the planet carrier 120 are matched through the intermediate bearing 80. Due to the axial manufacturing and processing errors of the housing assembly 300, the planet carrier 120, the sun gear shaft 110, etc., there will be a certain gap between the intermediate bearing 80 on the end side of the sun gear shaft 110 and the planet carrier shaft 121. In some extreme cases, the lubricating oil flowing into this part will leak out through the gap in large quantities. By embedding an oil guide tube 10 in the sun gear shaft 110 and sleeved outside the oil guide tube 10, it can be ensured that the lubricating oil in the sun gear shaft 110 is introduced into the oil collecting chamber 124 of the planet carrier 120 as much as possible.

The oil guide member 20 is annular and is sleeved outside the planetary carrier shaft 121. In some embodiments, the oil guide member 20 may be sleeved outside the planetary carrier shaft 121. The portion of the oil guide member 20 close to the outer ring fits with the connecting plate 122 and/or the planetary gear shaft 123, so that the lubricating oil thrown to the outer periphery of the planetary gear row 100 by centrifugal action is blocked by the oil guide member 20 and collected on the inner side of the fitting between the oil guide member 20 and the planetary gear shaft 123. Along the radial direction of the planetary gear row 100, the fitting between the oil guide member 20 and the planetary gear shaft 123 should be located outside the entrance of the second oil guide hole 126, so that the lubricating oil collected on the inner side of the fitting between the oil guide member 20 and the planetary gear shaft 123 can enter the second oil guide hole 126. In some embodiments, the portion of the oil guide member 20 close to the outer ring fits with the portion of the connecting plate 122 located outside the planetary gear shaft 123. In some embodiments, the oil guide member 20 can be configured as a disc-shaped ring structure so that the inner disc surface of the oil guide member 20 is inclined relative to both the axial and radial directions, which can guide the lubricating oil to a certain extent and ensure that as much lubricating oil as possible enters the second oil guide hole 126 .

The second oil guide hole 126 may be a channel extending radially and/or axially along the planetary gear shaft 123, or may be a channel extending circumferentially along the planetary gear shaft 123. In other words, the second oil guide hole 126 may be an axial straight channel, a radial straight channel, an oblique straight channel, a curved channel, etc., which is not limited in the present disclosure. In some embodiments, the second oil guide hole 126 includes a channel extending radially and/or axially along the planetary gear shaft 123. The second oil guide hole 126 may include 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, and 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 according to the size of the planetary gear bearing 40, and is usually set to more than two. The outlets of the more than two radial oil guide holes 1262 are spaced and evenly distributed along the circumferential surface of the planetary gear shaft 123. For example, the second oil guide hole 126 may include 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 degrees to each other, so as to ensure that the oil reaches the planetary gear bearing 40 and avoid sintering of the entire planetary gear row 100 due to insufficient lubrication of the planetary gear bearing 40. In some embodiments, the inlet of the axial oil guide hole 1261 is set to be a flared port, and the flared port may be a circular flared port in some embodiments to reduce flow resistance. Along the axial direction of the planetary gear shaft 123 , the diameter of the expanded hole gradually increases from the middle to the end, so as to facilitate the lubricating oil to enter the axial oil guide hole 1261 .

In some embodiments, a first planet carrier bearing 50 is mounted on the planet carrier 120, and the first planet carrier bearing 50 is arranged in the lubrication channel 160, and the internal gap of the first planet carrier bearing 50 is connected to the lubrication channel 160 for the circulation of lubricating oil. As shown in FIG. 1 and FIG. 2, the first planet carrier bearing 50 is mounted on the planet carrier shaft 121 and is close to the connecting plate 122 of the planet carrier 120. The first planet carrier bearing 50 is a thrust bearing, and the loose ring of the thrust bearing is in contact with the connecting plate 122, and the tight ring of the thrust bearing is connected and/or in contact with an external fixed member (for example, a housing assembly 300 for mounting the planetary gear 100), so that the planetary gear 100 is axially stable. A channel for the circulation of lubricating oil can be formed between the loose ring and the tight ring, and the roller of the thrust bearing can also be lubricated when the lubricating oil circulates between the loose ring and the tight ring. Of course, in other embodiments, the first planet carrier bearing 50 can also be arranged at other positions of the planet carrier 120, and completely separated from the lubrication channel 160, so as to avoid the internal structure of the first planet carrier bearing 50 from generating flow resistance.

In some embodiments, in order to improve the rotation stability of the planet carrier 120, a second planet carrier bearing 60 is also installed on the planet carrier shaft 121. The second planet carrier bearing 60 adopts a needle bearing. For example, the planet carrier 120 can be installed in the housing assembly 300 (which can be the right housing 310) through the second planet carrier bearing 60. The second planet carrier bearing 60 also needs lubrication during operation. For this purpose, the planet carrier shaft 121 is provided with a third oil guide hole 127 connected to the oil collecting chamber 124, and the outlet of the third oil guide hole 127 faces the second planet carrier bearing 60. In general, the oil collecting chamber 124 is required to accommodate the end of the oil guide pipe 10 near the planetary row 100, and store a certain amount of oil to be transported to the third oil guide hole 127. Taking into account that the second planetary carrier bearing 60 requires less lubricating oil than the planetary wheel bearing 40, in order to ensure that the planetary wheel bearing 40 is adequately supplied with oil, in some embodiments, the oil collecting chamber 124 has a stepped hole structure, wherein the large hole section 1241 is used to accommodate the end of the oil guide pipe 10 near the planetary row 100, and the small hole section 1242 is connected to the third oil guide hole 127.

Considering that a plurality of bearings are usually installed on the transmission shaft (sun gear shaft 110, planet carrier shaft 121 or inner gear ring shaft 200) of the planetary gear row 100, in order to meet the lubrication requirements of the plurality of bearings, in some embodiments, the oil guide tube 10 is provided with a plurality of oil outlet holes 11 spaced apart along the axial direction and/or radial direction of the oil guide tube 10. A plurality of oil outlet holes 11 are usually provided along the axial direction of the guide tube, and the aperture and hole spacing of each oil outlet hole 11 are the same. A plurality of oil outlet holes 11 located at the same axial position can also be provided, and a plurality of oil outlet holes 11 located at the same axial position are spaced apart along the circumferential direction, so that the oil can flow evenly into the first hollow cavity 111 of the sun gear shaft 110. An additional oil outlet hole 11 can also be provided at the axial position of the oil guide tube 10 corresponding to the installation position of the bearing.

The oil guide tube 10 and the first hollow cavity 111 of the sun gear shaft 110 may be clearance-fitted, or the inner diameter of the first hollow cavity 111 is much larger than the outer diameter of the oil guide tube 10, for example, the radius difference between the inner diameter of the first hollow cavity 111 and the outer diameter of the oil guide tube 10 is 0.1-10 mm, or may be 0.5-3 mm. Since the inner diameter of the first hollow cavity 111 is larger than the outer diameter of the oil guide tube 10, an annular oil storage cavity 1111 is formed between the oil guide tube 10 and the cavity wall of the first hollow cavity 111, and the oil outlet hole 11 of the oil guide tube 10 is connected to the oil storage cavity 1111, so that part of the oil in the oil guide tube 10 is uniformly guided to the oil storage cavity 1111, and the oil in the oil storage cavity 1111 can lubricate the external components of the sun gear shaft 110 through the oil hole on the sun gear shaft 110.

In some embodiments, the planetary gear row 100 further includes an inner gear ring shaft 200 rotatably sleeved on the sun gear shaft 110. The inner gear ring 150 of the planetary gear row 100 is fixedly connected to the inner gear ring shaft 200, and the inner gear ring 150 may be integrally formed on the inner gear ring shaft 200, or the inner gear ring 150 and the main body of the inner gear ring shaft 200 are welded, keyed, or press-fitted. The oil storage cavity 1111 has a reaming section 1112, and the reaming section 1112 corresponds to the axial position of the inner gear ring shaft 200.

The inner gear ring shaft 200 needs to rotate during operation, so the inner gear ring shaft 200 also needs to be provided with a bearing, which can be sleeved on the outer circumference of the inner gear ring shaft 200 or embedded in the inner circumference of the inner gear ring shaft 200. In the embodiment, a support bearing 70 may be installed between the sun gear shaft 110 and the inner gear ring shaft 200, the inner ring of the support bearing is sleeved on the sun gear shaft 110, and the inner gear ring shaft 200 is sleeved on the outer ring of the support bearing. A fourth oil guide hole 112 is provided on the sun gear shaft 110, the fourth oil guide hole 112 is communicated with the oil storage chamber 1111, and the outlet of the fourth oil guide hole 112 faces the support bearing 70.

Since the inner diameter of the first hollow cavity 111 is larger than the outer diameter of the oil guiding tube 10, in order to ensure that the oil guiding tube 10 is stably installed in the first hollow cavity 111, in some embodiments, at least one bushing 30 is sleeved on the oil guiding tube 10, and the bushing 30 fills the gap between the oil guiding tube 10 and the cavity wall of the first hollow cavity 111. The bushing 30 plays a role in supporting the oil guiding tube 10, and the material of the bushing 30 is copper or composite plastic.

In some embodiments, the distal planetary gear 100 end of the oil guide tube 10 is provided with more than one oil outlet 12. Since the oil outlet 12 is opened on the tube wall of the oil guide tube 10, oil can be discharged radially, reducing resistance and facilitating oil to enter the lubrication channel 160. The oil outlet 12 can be set as a slot with an opening or a complete hole, for example, the oil outlet 12 can be a U-shaped slot or a round hole. The number of oil outlets 12 is not limited in the present disclosure. For example, if the number of oil outlets 12 is set to 3, the shapes of the 3 oil outlets 12 can be the same or different.

Therefore, the planetary gear lubrication structure provided in the embodiment of the present disclosure pumps lubricating oil into the oil guide pipe 10 through an external oil pump (such as an electronic oil pump), and adopts a long tube structure to guide the oil, so as to prevent the lubricating oil from not being able to fully reach the interior of the planetary gear 100 due to the centrifugal force of high-speed operation. The oil guide plate is designed to ensure that the oil enters the planetary gear shaft 123 of the planetary gear 100, and the lubricating oil that flows to the planetary gear bearing 40 can also flow to the meshing position of the planetary gear 140 with the inner ring gear 150 and the sun gear 130 during the operation of the planetary gear 100, so as to fully lubricate the entire planetary gear 100.

Based on the same inventive concept, another planetary gear lubrication structure is provided according to the second aspect of the present disclosure. FIG. 3 is a schematic structural diagram of a planetary gear lubrication structure according to other embodiments of the present disclosure. As shown in FIG. 3 , the planetary gear lubrication structure may also include a planetary gear 100 and an oil guide pipe 10. The sun gear shaft 110 of the planetary gear 100 may be provided with a first hollow cavity 111 that penetrates along the axial direction, and the planet carrier 120 of the planetary gear 100 is provided with an oil collecting cavity 124 and a lubrication channel 160. The first hollow cavity 111, the oil collecting cavity 124 and the lubrication channel 160 are connected in sequence, and the outlet of the lubrication channel 160 faces the planetary gear bearing 40 of the planetary gear 100. The oil guide pipe 10 is installed through the sun gear shaft 110 of the planetary gear 100. In some embodiments, it may be installed through the first hollow cavity 111, and the end of the oil guide pipe 10 near the planetary gear 100 extends into the oil collecting cavity 124.

Different from the first aspect of the present disclosure, the planetary gear lubrication structure may further include a mechanical pump 90, the near planetary gear 100 end of the oil guide tube 10 is transmission-connected to the planetary frame 120, and the far planetary gear 100 end of the oil guide tube 10 is transmission-connected to the rotor 91 of the mechanical pump 90. Thus, when the planetary frame 120 of the planetary gear 100 rotates, since the near planetary gear 100 end of the oil guide tube 10 is transmission-connected to the planetary frame 120, the planetary frame 120 can drive the oil guide tube 10 to rotate, and the far planetary gear 100 end of the oil guide tube 10 is transmission-connected to the rotor 91 of the mechanical pump 90, so the oil guide tube 10 can drive the rotor 91 of the mechanical pump 90 to rotate, so that the mechanical pump 90 operates, thereby providing the lubricating oil required by the planetary gear 100, and realizing active lubrication.

The transmission connection between the oil guide pipe 10 and the planetary carrier 120 and the rotor 91 of the mechanical pump 90 can adopt any structure that can realize mechanical transmission in the prior art, such as key connection, gear meshing, welding fixation, special shape matching, etc., which is not limited by the present disclosure. In some embodiments, the end of the oil guide pipe 10 near the planetary row 100 is key-connected with the planetary carrier 120, and a flat key connection, a spline connection, etc. can be adopted. In some embodiments, the planetary carrier 120 is provided with an internal spline 170, and the end of the oil guide pipe 10 near the planetary row 100 is provided with an external spline 13, then the end of the oil guide pipe 10 near the planetary row 100 is spline-connected with the planetary carrier 120. The internal spline 170 can be arranged on the cavity wall of the oil collecting cavity 124, and the internal spline 170 and the body of the planetary carrier 120 can be integrally formed; in some embodiments, the internal spline 170 and the planetary carrier 120 can also be fixedly connected by welding, pressing, etc.

The distal planetary gear 100 end of the oil guide tube 10 is connected to the flat opening 92 of the rotor 91 of the mechanical pump 90. In some embodiments, only one flat opening 92 may be provided in the circumferential direction, or multiple flat openings 92 may be provided at intervals along the circumferential direction to form a special shape that is approximately polygonal, so that the distal planetary gear 100 end of the oil guide tube 10 and the rotor 91 of the mechanical pump 90 are limited in the circumferential direction to transmit torque. Other undetailed structures of the planetary gear lubrication structure provided in some embodiments may refer to the first aspect of the present disclosure, and will not be repeated here.

Therefore, the planetary gear lubrication structure provided by the embodiment of the present disclosure does not require an external oil pump. The rotor 91 of the mechanical pump 90 is driven to rotate through the planetary carrier 120 via the oil guide pipe 10 to pressurize the oil and pump the lubricating oil into the oil guide pipe 10. Compared with an electronic pump, the mechanical pump 90 does not require additional electrical energy and can pump oil using the mechanical energy of the planetary carrier 120, thereby reducing energy consumption. The long tube structure is used to guide the oil to prevent the lubricating oil from not being able to fully reach the interior of the planetary gear 100 due to the centrifugal force of high-speed operation. The oil guide plate design is used to ensure that the oil enters the interior of the planetary gear shaft 123 of the planetary gear 100 and flows to the planetary gear bearing 40. During the operation of the planetary gear set 100 , the lubricating oil can also flow to the meshing positions of the planetary gear 140 , the inner gear ring 150 , and the sun gear 130 , thereby fully lubricating the entire planetary gear set 100 .

Based on the same inventive concept, a hybrid electric drive assembly 1000 is provided according to the third aspect of the present disclosure. FIG. 4 is an overall structural diagram of a hybrid electric drive assembly according to some embodiments of the present disclosure; FIG. 5 is a structural schematic diagram of the hybrid electric drive assembly of FIG. 4 after the right housing is removed; and FIG. 6 is a structural schematic diagram of the hybrid electric drive assembly of FIG. 4 after the end cover is removed. As shown in FIG. 1 , FIG. 2 , and FIG. 4 to FIG. 6 , a housing assembly 300 and a planetary gear lubrication structure of the first aspect of the present disclosure are included. 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. The lubricating oil is provided with circulation power by an oil pump, and the oil pump can be arranged inside the housing assembly 300 or outside the housing assembly 300. Of course, in some embodiments, other oil pumps can also be used to provide pumping oil pressure, such as the oil pump of the engine.

The hybrid electric drive assembly 1000 may also include a motor assembly 400. The motor assembly 400 may include a generator and/or a drive motor according to actual needs. The motor assembly 400 is connected to the housing assembly 300, and the motor assembly 400 may be installed in the inner cavity of the housing assembly 300, or located outside the housing assembly 300. In some embodiments, the motor assembly 400 is encapsulated in the inner cavity of the housing assembly 300, and the lubricating oil introduced by the oil inlet channel 301 of the housing assembly 300 can also be used to cool the stator of the motor assembly 400. Usually, for an independently working motor, a cooling cavity needs to be set in the motor housing, and a cooling medium is introduced to cool the motor stator. In some embodiments, since the motor assembly 400 is encapsulated in the inner cavity of the housing assembly 300, it is not necessary to set 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 carrying performance of the hybrid electric drive assembly 1000.

In some embodiments, the rotor 410 of the motor assembly 400 is provided with a second hollow cavity 411 that penetrates in the axial direction, and the oil inlet passage 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 100, and the lubricating oil introduced into the oil inlet passage 301 of the housing assembly 300 is introduced into the first hollow cavity 111 of the planetary gear 100 through the second hollow cavity 411, and the oil guide pipe 10 of the planetary gear lubrication structure is installed in the second hollow cavity 411 and the first hollow cavity 111, and the end of the oil guide pipe 10 far from the planetary gear 100 is directly connected to the oil inlet passage 301 of the housing assembly 300, and the end of the oil guide pipe 10 near the planetary gear 100 is directly connected to the oil collecting cavity 124 of the planetary carrier 120. By connecting the rotor 410 of the motor assembly 400 in series with the internal oil circuit of the planetary gear 100, 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 mountability of the hybrid electric drive assembly 1000.

In some embodiments, the housing assembly 300 includes a right housing 310, a left housing 320 and an end cover 330 connected in sequence, the right housing 310 and the left housing 320 enclose a shaft gear installation cavity 302, and the planetary gear row 100 is located in the shaft gear installation cavity 302. The left housing 320 and the end cover 330 enclose a motor installation cavity 303, and the motor assembly 400 is located in the motor installation cavity 303. In some embodiments, the planet carrier shaft 121 is supported on the right housing 310 through the first planet carrier bearing 50 and the second planet carrier bearing 60. The sun gear shaft 110 is supported by two support bearings 70, and the support bearings 70 are installed in the inner hole of the inner gear ring shaft 200. The end of the sun gear shaft 110 is against the planet carrier shaft 121 through the intermediate bearing 80. The rotor 410 of the motor assembly 400 is a sleeve structure, the rotor 410 is connected to the sun gear shaft 110 through a spline, and the rotor 410 is supported on the left housing 320 and the end cover 330 through two bearings.

The oil inlet channel 301 is arranged 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 100 falls into the oil pan, and the external oil pump provides oil pumping power, so that the lubricating oil circulates in the oil pan, the oil inlet channel 301, the oil guide pipe 10, and the lubrication channel 160.

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, the intermediate shaft gear assembly 600 and the differential assembly 700 are all located in the shaft gear installation cavity 302. The shift mechanism assembly 500 and the intermediate shaft gear assembly 600 cooperate with the planetary gear 100 to realize the speed change and shifting functions, and the power is output to the wheel shaft system by the differential assembly 700. The controller assembly 800 is installed outside the housing assembly 300 to control the operation of the motor assembly 400 and/or the shift mechanism assembly 500. Of course, the controller assembly 800 can also control the operation of the oil pump and some sensors (temperature sensors, pressure sensors, etc.) and other electronic devices set inside the hybrid electric drive assembly 1000. The specific contents of the shift mechanism assembly 500, the intermediate shaft gear assembly 600 and the controller assembly 800 can refer to the relevant disclosure of the prior art, and will not be described here.

In general, the hybrid electric drive assembly 1000 according to some embodiments of the present disclosure is configured with the above-mentioned The planetary gear lubrication structure of the first aspect correspondingly has all the technical effects of the planetary gear lubrication structure of the first aspect of the present disclosure, and based on the structural design of the housing assembly 300 and the motor assembly 400 in the hybrid electric drive assembly 1000 of some embodiments, the hybrid electric drive assembly 1000 of some embodiments also has the advantages of high integration, good reliability, and high vehicle mountability.

Based on the same inventive concept, another hybrid electric drive assembly 1000 is provided according to the fourth aspect of the present disclosure, as shown in Figures 3 to 6, and may include a housing assembly 300 and the planetary gear lubrication structure of the second aspect of the present disclosure. The housing assembly 300 is provided with an oil inlet channel 301, and the planetary gear lubrication structure is installed inside the housing assembly 300. The internal oil channel of the mechanical pump 90 of the planetary gear lubrication structure is respectively connected with the oil inlet channel 301 and the first hollow cavity 111 of the planetary gear 100, and the bottom of the inner cavity of the housing assembly 300 forms an oil pan. When the planet carrier 120 of the planetary gear 100 rotates, the planet carrier 120 drives the oil guide pipe 10 to rotate, and then the oil guide pipe 10 drives the rotor 91 of the mechanical pump 90 to rotate, so that the mechanical pump 90 operates, thereby providing pump oil pressure, and the lubricating oil circulates in the oil inlet channel 301, the internal oil channel of the mechanical pump 90, the oil guide pipe 10, the lubrication channel 160, and the oil pan to achieve active lubrication.

The hybrid electric drive assembly 1000 also includes a motor assembly 400, which may include a generator and/or a drive motor according to actual needs. The motor assembly 400 is connected to the housing assembly 300, and the motor assembly 400 may be installed in the inner cavity of the housing assembly 300, or located outside the housing assembly 300. In some embodiments, the motor assembly 400 is encapsulated in the inner cavity of the housing assembly 300, and the lubricating oil pumped in by the mechanical pump 90 can also be used to cool the stator of the motor assembly 400. Usually, for an independently working motor, a cooling cavity needs to be set in the motor housing, and a cooling medium is introduced to cool the motor stator. In some embodiments, since the motor assembly 400 is encapsulated in the inner cavity of the housing assembly 300, it is not necessary to set 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 carrying performance of the hybrid electric drive assembly 1000.

In some embodiments, the rotor 410 of the motor assembly 400 is provided with a second hollow cavity 411 extending axially therethrough, the oil guide pipe 10 is installed in the second hollow cavity 411 and the first hollow cavity 111 , and is transmission-connected to the rotor 91 of the mechanical pump 90 , and the oil guide pipe 10 is connected to the internal oil passage of the mechanical pump 90 . The oil inlet channel 301, the internal oil channel of the mechanical pump 90, 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 100, the lubricating oil introduced into the oil inlet channel 301 of the housing assembly 300 is introduced into the first hollow cavity 111 of the planetary gear 100 through the second hollow cavity 411, the oil guide pipe 10 of the planetary gear lubrication structure is installed in the second hollow cavity 411 and the first hollow cavity 111, the far planetary gear 100 end of the oil guide pipe 10 is directly connected to the oil inlet channel 301 of the housing assembly 300, and the near planetary gear 100 end of the oil guide pipe 10 is directly connected to the oil collecting cavity 124 of the planetary carrier 120. By connecting the rotor 410 of the motor assembly 400 in series with the internal oil circuit of the planetary gear 100, 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 carrying performance of the hybrid electric drive assembly 1000.

In some embodiments, the housing assembly 300 may include a right housing 310, a left housing 320 and an end cover 330 connected in sequence, the right housing 310 and the left housing 320 enclose a shaft gear installation cavity 302, and the planetary gear 100 is located in the shaft gear installation cavity 302. The left housing 320 and the end cover 330 enclose a motor installation cavity 303, and the motor assembly 400 is located in the motor installation cavity 303. The oil inlet channel 301 is provided in the end cover 330, and the bottom of the left housing 320 forms an oil pan, and the lubricating oil after lubricating the planetary gear 100 falls into the oil pan, and the mechanical pump 90 provides pumping power; the mechanical pump 90 can be provided inside the housing assembly 300 or outside the housing assembly 300, and the lubricating oil circulates in the oil pan, the oil inlet channel 301, the internal oil channel of the mechanical pump 90, the oil guide pipe 10, and the lubricating channel 160.

In some embodiments, the hybrid electric drive assembly 1000 may also include 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, the intermediate shaft gear assembly 600 and the differential assembly 700 are all located in the shaft gear installation cavity 302; the shift mechanism assembly 500 and the intermediate shaft gear assembly 600 cooperate with the planetary gear 100 to realize the speed change and shifting functions; the power is output to the wheel shaft system by the differential assembly 700. The controller assembly 800 is installed outside the housing assembly 300 to control the operation of the motor assembly 400 and/or the shift mechanism assembly 500. Of course, the controller assembly 800 can also control the operation of the oil pump and some sensors (temperature sensors, pressure sensors, etc.) and other electronic devices set inside the hybrid electric drive assembly 1000. The specific contents of the shift mechanism assembly 500, the intermediate shaft gear assembly 600 and the controller assembly 800 can refer to the relevant disclosure of the prior art, and will not be described here.

In general, the hybrid electric drive assembly 1000 according to some embodiments of the present disclosure is configured with the above-mentioned The planetary gear lubrication structure of the second aspect correspondingly has all the technical effects of the planetary gear lubrication structure of the second aspect of the present disclosure, and based on the structural design of the housing assembly 300 and the motor assembly 400 in the hybrid electric drive assembly 1000 of some embodiments, the hybrid electric drive assembly 1000 of some embodiments also has the advantages of high integration, good reliability, and high vehicle mountability.

Based on the same inventive concept, a vehicle is provided according to the fifth aspect of the present disclosure, including the hybrid electric drive assembly 1000 of the third aspect of the present disclosure or the fourth aspect of the present disclosure. The specific structure of the hybrid electric drive assembly 1000 refers to the third aspect of the present disclosure or the fourth aspect of the present disclosure. Since the hybrid electric drive assembly 1000 adopts all the technical solutions of the third aspect of the present disclosure or the fourth aspect of the present disclosure, it at least has all the beneficial effects brought by the technical solutions of the third aspect of the present disclosure or the fourth aspect of the present disclosure, which will not be described one by one here.

According to some embodiments of the present disclosure, the planetary gear lubrication structure provided by the present disclosure adopts an active lubrication scheme. In some embodiments, the sun gear shaft of the planetary gear is provided with a first hollow cavity that penetrates along the axial direction, and the planetary frame of the planetary gear is provided with an oil collecting chamber. The first hollow cavity, the oil collecting chamber and the lubrication channel of the planetary gear are connected in sequence, and the outlet of the lubrication channel faces the planetary gear bearing of the planetary gear. The oil guide pipe is installed inside the sun gear shaft of the planetary gear, and the end of the oil guide pipe close to the planetary gear extends into the oil collecting chamber. By setting the oil guide pipe, when the axial oil guide channel is relatively long, the oil guide pipe is used to transfer the lubricating oil from the lubricating oil inlet at the far planetary gear end to the planetary frame of the planetary gear, which can avoid the situation where the centrifugal force formed by the high-speed operation of the sun gear shaft throws the oil out and cannot reach the planetary gear, and the end of the oil guide pipe close to the planetary gear extends into the oil collecting chamber, which can reduce the leakage of the lubricating oil at the gap between the sun gear shaft and the planetary frame. The lubricating oil circulates in the lubrication channel and eventually flows to the planetary gear bearings, lubricating the bearings of each planetary gear, ensuring sufficient lubrication of the bearings and avoiding vehicle safety problems caused by ablation of the entire planetary gear.

Although the preferred embodiments of the present disclosure have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present disclosure.

Obviously, those skilled in the art can make various changes and modifications to the present disclosure without departing from the spirit and scope of the present disclosure. Thus, if these modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is also intended to include these modifications and variations.

Claims

A planetary gear lubrication structure, comprising:

A planetary gear is provided with a lubrication channel, the outlet of the lubrication channel faces the planetary gear bearing of the planetary gear; the sun gear shaft of the planetary gear is provided with a first hollow cavity penetrating along the axial direction, the planet carrier of the planetary gear is provided with an oil collecting cavity, and the first hollow cavity, the oil collecting cavity and the lubrication channel are connected in sequence; and

The oil guide pipe is installed in the first hollow cavity through the first hollow cavity, and the end near the planetary gear row extends into the oil collecting cavity.
The planetary gear lubrication structure according to claim 1, wherein: the planet carrier comprises a planet carrier shaft, a connecting plate and a planetary gear shaft connected in sequence, the planet carrier shaft is provided with the oil collecting chamber and the first oil guide hole in communication, and the planetary gear shaft is provided with a second oil guide hole;

An oil guide piece is disposed on the outer side of the connecting plate; the first oil guide hole, the gap between the oil guide piece and the connecting plate, and the second oil guide hole are sequentially connected to form the lubrication channel.
The planetary gear lubrication structure according to claim 2, wherein: 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, and the outlet of the radial oil guide hole constitutes the outlet of the lubrication channel.
The planetary gear lubrication structure as claimed in claim 2, wherein: a first planetary gear bearing is mounted on the planetary gear shaft, and the first planetary gear bearing is arranged in the lubrication channel; a second planetary gear bearing is mounted on the planetary gear shaft; the planetary gear shaft is provided with a third oil guide hole connected to the oil collecting chamber, and the outlet of the third oil guide hole faces the second planetary gear bearing; an intermediate bearing is provided between the planetary gear shaft and the sun gear shaft, and the internal gap of the intermediate bearing is connected to the first hollow cavity.
The planetary gear lubrication structure according to claim 2, wherein: the oil guide member is annular, and is sleeved outside the planetary carrier shaft, and the portion close to the outer ring is in contact with the connecting plate and/or the planetary gear shaft.
The planetary gear lubrication structure according to claim 1, wherein: the oil guide pipe is provided with a plurality of oil outlet holes spaced apart along the axial direction and/or radial direction of the oil guide pipe.
The planetary gear lubrication structure as claimed in claim 6, wherein: the inner diameter of the first hollow cavity is larger than the outer diameter of the oil guide tube, so as to form an annular oil storage cavity between the oil guide tube and the cavity wall of the first hollow cavity; and the oil outlet hole is connected to the oil storage cavity.
The planetary gear lubrication structure as claimed in claim 7, wherein: the planetary gear further comprises an inner gear ring shaft rotatably sleeved on the sun gear shaft; the oil storage chamber has an expanded hole section, and the expanded hole section corresponds to the axial position of the inner gear ring shaft.
The planetary gear lubrication structure according to claim 8, wherein: a support bearing is installed between the sun gear shaft and the inner ring gear shaft, a fourth oil guide hole is provided on the sun gear shaft, and an outlet of the fourth oil guide hole faces the support bearing.
The planetary gear lubrication structure according to any one of claims 1 to 9, wherein: the far planetary gear end of the oil guide pipe is provided with an oil outlet; the oil outlet is a U-shaped groove and/or a circular hole.
The planetary gear lubrication structure according to any one of claims 1 to 9, wherein: at least one bushing is provided on the oil guide pipe.
The planetary row lubrication structure as described in any one of claims 1 to 9, wherein: the planetary row lubrication structure also includes a mechanical pump; the near planetary row end of the oil guide pipe is transmission connected to the planetary carrier, and the far planetary row end of the oil guide pipe is transmission connected to the rotor of the mechanical pump.
The planetary gear lubrication structure according to claim 12, wherein: the near planetary gear end of the oil guide pipe is connected to the planetary carrier key, and the far planetary gear end of the oil guide pipe is connected to the rotor flat end of the mechanical pump.
The planetary gear lubrication structure according to claim 13, wherein: the planet carrier is provided with an internal spline, the end of the oil guide tube near the planetary gear is provided with an external spline, and the end of the oil guide tube near the planetary gear is connected to the planet carrier spline.
The planetary gear lubrication structure as claimed in claim 14, wherein: the internal spline is arranged on the cavity wall of the oil collecting cavity; the internal spline is integrally formed on the planetary carrier, or the internal spline is fixedly connected to the planetary carrier.
A hybrid electric drive assembly, comprising:

a housing assembly having an oil inlet passage; and

The planetary gear lubrication structure according to any one of claims 1 to 15 is installed inside the housing assembly, and the first hollow cavity of the planetary gear lubrication structure is connected to the oil inlet channel.
The hybrid electric drive assembly as described in claim 16, wherein: the hybrid electric drive assembly also includes a motor assembly connected to the housing assembly, and the rotor of the motor assembly is provided with a second hollow cavity extending axially therethrough; the oil inlet passage, the second hollow cavity and the first hollow cavity are connected in sequence, and the oil guide pipe is installed in the second hollow cavity and the first hollow cavity.
The hybrid electric drive assembly as described in claim 17, wherein: 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 shaft gear mounting cavity, and the left housing and the end cover together form a motor mounting cavity; the planetary gear is located in the shaft gear mounting cavity, and the motor assembly is located in the motor mounting cavity; the oil inlet channel is provided in the end cover.
A vehicle comprising the hybrid electric drive assembly according to any one of claims 16 to 18.