阅读说明：本技术 集油环及行星齿轮机构 (Oil collecting ring and planetary gear mechanism ) 是由 张斌 于 2021-08-27 设计创作，主要内容包括：本申请提供了一种集油环及行星齿轮机构。该集油环的凸起部固定于主体部且至少部分地从主体部的外周壁朝向径向外侧凸出,凸起部形成有位于外周壁的径向外侧且朝向排油板的周向两侧开放的开口,凸起部还形成有从开口起延伸到排油板的进油通道。该集油环的排油板固定于主体部且从主体部朝向轴向一侧延伸,并且形成有与进油通道连通的排油通道。这样,在集油环朝向任意方向转动的过程中,利用离心力的作用,凸起部的开口能够有效收集主体部的外周壁的外表面上的润滑油,由此增大了集油环能够收集的润滑油的油量。利用排油板将润滑油导入到例如销轴轴承等需要润滑的部件,改善了润滑效果。(The application provides an oil collecting ring and a planetary gear mechanism. The bulge of the oil collecting ring is fixed on the main body and at least partially protrudes from the outer peripheral wall of the main body towards the radial outer side, the bulge is provided with openings which are located on the radial outer side of the outer peripheral wall and open towards the two circumferential sides of the oil discharging plate, and the bulge is also provided with an oil inlet channel which extends from the openings to the oil discharging plate. The oil discharge plate of the oil collection ring is fixed to the main body portion and extends from the main body portion toward one side in the axial direction, and an oil discharge passage communicated with the oil inlet passage is formed. In this way, the opening of the projection portion can effectively collect the lubricating oil on the outer surface of the outer peripheral wall of the main body portion by the action of the centrifugal force during the rotation of the oil gathering ring in any direction, thereby increasing the amount of the lubricating oil that can be collected by the oil gathering ring. The lubricating oil is guided to parts needing lubrication, such as pin shaft bearings, by the oil discharging plate, and the lubricating effect is improved.)

1. An oil gathering ring, comprising:

a main body (1) having an annular shape;

a first boss portion (21) and a first oil discharge plate (31), the first boss portion (21) being fixed to the main body portion (1) and at least partially protruding toward a radial outside from an outer peripheral wall (12) of the main body portion (1), the first boss portion (21) is formed with a first opening (21o) located radially outward of the outer peripheral wall (12) and open to one side in the circumferential direction of the first oil discharge plate (31), the first boss portion (21) is further formed with a first oil inlet passage (21p) extending from the first opening (21o) to the first oil discharge plate (31), the first oil discharge plate (31) is fixed to the main body portion (1) and extends from the main body portion (1) toward one axial side, the first oil discharge plate (31) is formed with a first oil discharge passage (31p) that communicates with the first oil intake passage (21 p); and

second bellying (22) and second oil drain plate (32), second bellying (22) are fixed in main part (1) and at least partly follow periphery wall (12) of main part (1) are towards radial outside protrusion, second bellying (22) are formed with and are located the radial outside of periphery wall (12) and towards the open second opening (22o) of circumference opposite side of second oil drain plate (32), second bellying (22) still are formed with the follow second opening (22o) play and extend to the second oil feed passageway of second oil drain plate (32), second oil drain plate (32) are fixed in main part (1) and follow main part (1) orientation axial one side extends, second oil drain plate (32) be formed with second oil drain passageway (32p) that second oil feed passageway communicates.

2. Oil collecting ring according to claim 1,

a first radially outer side wall surface of the first boss portion (21) for forming the first oil inlet passage (21p) is an arc-shaped surface, extends toward a radially inner side while extending from the first opening (21o) toward the other side in the circumferential direction, and

a second radially outer side wall surface of the second projecting portion (22) for forming the second oil inlet passage is an arc-shaped surface, and the second radially outer side wall surface extends from the second opening (22o) toward the radial inner side while extending toward the circumferential one side.

3. Oil collecting ring according to claim 2,

a third radially outer side wall surface of the first oil discharge plate (31) for forming the first oil discharge passage (31p) is an arc-shaped surface, the third radially outer side wall surface is connected to a radially inner end of the first radially outer side wall surface, and

a fourth radially outer wall surface of the second oil discharge plate (32) for forming the second oil discharge passage (32p) is an arc-shaped surface, and the fourth radially outer wall surface is connected to a radially inner end of the second radially outer wall surface.

4. The oil gathering ring according to any one of claims 1 to 3, wherein one of the first projections (21) and one of the second projections (22) constitute a set of projections, the first oil drainage plate (31) and the second oil drainage plate (32) of the set of projections are arranged adjacent to and side by side, and a plurality of sets of projections spaced apart from each other are provided in a circumferential direction (C) of the oil gathering ring, and the plurality of sets of projections are uniformly distributed in the circumferential direction (C).

5. The oil gathering ring as claimed in claim 4, wherein the first and second oil drainage plates (31, 32) have a common side wall (33) for the set of bosses.

6. The oil gathering ring according to any one of claims 1 to 3, further comprising a flange portion (4) having a circular ring shape, the flange portion (4) being fixed to the main body portion (1) and projecting from an axial one-side end edge of the main body portion (1) toward a radial outer side, the first projecting portion (21) and the second projecting portion (22) being located on an axial other side of the flange portion (4).

7. The oil gathering ring as claimed in claim 6, wherein the main body portion (1), the first boss portion (21), the second boss portion (22), the first oil discharge plate (31), the second oil discharge plate (32), and the flange portion (4) are formed in one piece.

8. The oil gathering ring as defined in any one of claims 1 to 3, further comprising a plurality of catching portions (5), each catching portion (5) extending from the main body portion (1) toward the one axial side, the plurality of catching portions (5) being evenly distributed at intervals in a circumferential direction (C) of the oil gathering ring.

9. A planetary gear mechanism, comprising an oil gathering ring as claimed in any one of claims 1 to 8.

10. The planetary gear mechanism as in claim 9, further comprising a sun gear, a plurality of planet gears, a planet gear carrier, a ring gear, a plurality of planet gear shafts, and a plurality of bearings,

the plurality of planet wheels are positioned on the radial outer side of the sun wheel and are always meshed with the sun wheel, the gear ring is positioned on the radial outer side of the plurality of planet wheels and is always meshed with the plurality of planet wheels, the plurality of planet wheels are respectively arranged on the plurality of planet wheel shafts, the plurality of planet wheel shafts are respectively fixed with the planet wheel carrier, the plurality of bearings are respectively positioned between the plurality of planet wheels and the plurality of planet wheel shafts, and the oil collecting ring and the planet wheel carrier are coaxially fixed on the planet wheel carrier, so that the adjacent first oil discharging plate (31) and the second oil discharging plate (32) of the oil collecting ring extend into the central hole of the same planet wheel shaft.

Technical Field

The present application relates to the field of lubrication of vehicles, and more particularly, to an oil gathering ring and a planetary gear mechanism including the same.

Background

In the related art, a new energy-source vehicle such as an electric vehicle integrates a driving motor, a planetary gear reducer, a wheel bearing, a brake system, and the like in a wheel space to constitute an in-wheel motor driving system in which the driving motor can directly drive a wheel.

Fig. 1A shows a structure of an in-wheel motor drive system. As shown in fig. 1A, the in-wheel motor drive system includes a housing 10, a drive motor 20, a planetary gear reducer 30, and an output shaft 40 assembled together. The driving motor 20, the planetary gear reducer 30 and the output shaft 40 are all received and mounted in the mounting space S inside the case 10. The torque of the driving motor 20 can be transmitted to the output shaft 40 via the planetary gear reducer 30 and then transmitted to the wheels through the output shaft 40, thereby driving the vehicle to travel. Referring to fig. 1B and 1C together, in the in-wheel motor drive system having the above-described structure, from the viewpoint of the performance and the continuous reliability of the function of the in-wheel motor drive system, it is important to lubricate the planetary gear reducer 30, and particularly, it is important to lubricate the pin shaft bearing 305 between the planetary gear 301 and the pin shaft 303 in the planetary gear reducer 30 in a high-speed load state.

As shown in fig. 1B and 1C, the planetary gear reducer 30 includes a planetary gear 301, a planetary carrier 302, a pin 303, an oil collecting ring 304, and a pin bearing 305. Planet wheel 301 is rotatably mounted on pin 303, pin bearing 305 is located between planet wheel 301 and pin 303 for supporting planet wheel 301 to rotate on pin 303, and planet wheel carrier 302 is fixed with pin 303. Further, as shown in fig. 1D, the oil gathering ring 304 includes a main body portion 3041, an oil drain plate 3042, and a catching portion 3043, which are integrally formed. The main body portion 3041 has a square shape with arcuate sides, and is formed with a circumferential groove that opens toward the radially inner side. The oil drain plate 3042 and the catching portion 3043 extend from the main body portion 3041 toward one side in the axial direction of the oil collecting ring 304, and an oil drain passage formed by the oil drain plate 3042 communicates with the circumferential groove. The oil gathering ring 304 is fixed to the carrier 302 by the snap 3043, and the oil drain plate 3042 of the oil gathering ring 304 protrudes into the center hole of the pin shaft 303 as shown in fig. 1C, so that the lubricating oil collected by the circumferential groove of the oil gathering ring 304 can be guided into the center hole of the pin shaft 303 via the oil drain plate 3042 and further guided to the pin shaft bearing 305 via the oil guide hole of the pin shaft 303 to lubricate the pin shaft bearing 305.

However, due to the limitation of the installation space S and the requirement for the structural compactness of each component of the in-wheel motor driving system, the gap between the main body 3041 of the oil collecting ring 304 and other components of the in-wheel motor driving system is very small, and lubricating oil is difficult to enter the circumferential groove of the oil collecting ring 304 through the gap between the main body 3041 of the oil collecting ring 304 and other components of the in-wheel motor driving system, so that the pin shaft bearing 305 is not lubricated sufficiently, and the service life of the pin shaft bearing 305 is ultimately affected.

Disclosure of Invention

The present application has been made in view of the state of the art described above. It is an object of the present application to provide an oil gathering ring which is capable of gathering sufficient lubricating oil as compared with the oil gathering ring described in the background art, thereby improving the lubricating effect achieved by the oil gathering ring. It is another object of the present application to provide a planetary gear mechanism including the oil gathering ring described above.

In order to achieve the above object, the present application adopts the following technical solutions.

The application provides a following oil collecting ring, includes:

a main body portion having an annular shape;

the first protrusion part is fixed on the main body part and at least partially protrudes from the peripheral wall of the main body part towards the radial outer side, the first protrusion part is formed with a first opening which is located on the radial outer side of the peripheral wall and is open towards one circumferential side of the first oil discharge plate, the first protrusion part is further formed with a first oil inlet channel which extends from the first opening to the first oil discharge plate, the first oil discharge plate is fixed on the main body part and extends from the main body part towards one axial side, and the first oil discharge plate is formed with a first oil discharge channel communicated with the first oil inlet channel; and

second bellying and second oil drain plate, the second bellying is fixed in the main part and at least partially follow the periphery wall of main part is protruding towards radial outside, the second bellying is formed with and is located the radial outside of periphery wall and orientation the open second opening of circumference opposite side of second oil drain plate, the second bellying still is formed with the follow the second opening is started to extend to the second oil feed passageway of second oil drain plate, the second oil drain plate is fixed in the main part just follows the main part orientation axial one side is extended, the second oil drain plate be formed with the second oil drain passageway of second oil feed passageway intercommunication.

In an alternative arrangement, the first and second electrodes may be,

a first radially outer side wall surface of the first projecting portion, which is used to form the first oil inlet passage, is an arc-shaped surface, extends toward a radially inner side while extending from the first opening toward the other circumferential side, and

a second radially outer side wall surface of the second projecting portion, which is used for forming the second oil inlet passage, is an arc-shaped surface, and the second radially outer side wall surface extends radially inward while extending toward one side of the circumferential direction from the second opening.

In a further alternative arrangement, the first and second,

a third radially outer side wall surface of the first oil discharge plate, which is used for forming the first oil discharge passage, is an arc-shaped surface, is connected with a radially inner end of the first radially outer side wall surface, and

and a fourth radial outer side wall surface of the second oil discharge plate, which is used for forming the second oil discharge channel, is an arc-shaped surface, and the fourth radial outer side wall surface is connected with the radial inner side end of the second radial outer side wall surface.

In another alternative, one of the first protruding portions and one of the second protruding portions form a set of protruding portions, the first oil drain plate and the second oil drain plate of the set of protruding portions are adjacent and arranged side by side, a plurality of sets of protruding portions spaced apart from each other are provided in the circumferential direction of the oil collecting ring, and the plurality of sets of protruding portions are uniformly distributed in the circumferential direction.

In another alternative, the first oil drainage plate and the second oil drainage plate have a common sidewall for the set of bosses.

In another alternative, the oil collecting ring further includes a flange portion having a circular ring shape, the flange portion is fixed to the main body portion and protrudes from an axial one-side end edge of the main body portion toward a radial outer side, and the first protruding portion and the second protruding portion are located on an axial other side of the flange portion.

In another alternative, the main body portion, the first boss portion, the second boss portion, the first oil discharge plate, the second oil discharge plate, and the flange portion are formed in one body.

In another optional scheme, the oil collecting ring further comprises a plurality of clamping portions, each clamping portion extends from the main body portion towards one axial side, and the plurality of clamping portions are evenly distributed in the circumferential direction of the oil collecting ring at intervals.

The present application further provides a planetary gear mechanism that includes the oil gathering ring according to any one of the above technical solutions.

In an optional scheme, the planetary gear mechanism further comprises a sun gear, a plurality of planet gears, a planet gear carrier, a gear ring, a plurality of planet gear shafts and a plurality of bearings,

the plurality of planet wheels are positioned on the radial outer side of the sun wheel and are always meshed with the sun wheel, the gear ring is positioned on the radial outer side of the plurality of planet wheels and is always meshed with the plurality of planet wheels, the plurality of planet wheels are respectively installed on the plurality of planet wheel shafts, the plurality of planet wheel shafts are respectively fixed with the planet wheel carrier, the plurality of bearings are respectively positioned between the plurality of planet wheels and the plurality of planet wheel shafts, and the oil collecting ring and the planet wheel carrier are coaxially fixed on the planet wheel carrier, so that the adjacent first oil discharging plate and the second oil discharging plate of the oil collecting ring extend into the same central hole of the planet wheel shaft.

By adopting the technical scheme, the oil collecting ring and the planetary gear mechanism comprising the oil collecting ring are provided. The oil collecting ring comprises a main body part, a first protruding part, a second protruding part, a first oil discharging plate and a second oil discharging plate. The main body has a circular ring shape. The first bulge is fixed in the main part and at least partially protrudes from the peripheral wall of the main part towards the radial outside, is formed with a first opening which is located on the radial outside of the peripheral wall and is open towards one side of the circumference of the first oil discharge plate, and is also formed with a first oil inlet channel which extends from the first opening to the first oil discharge plate. The second boss is fixed to the main body portion and at least partially protrudes from the outer peripheral wall of the main body portion toward the radial outer side, the second boss is formed with a second opening located on the radial outer side of the outer peripheral wall and opened toward the other circumferential side of the second oil discharge plate, and the second boss is further formed with a second oil inlet passage extending from the second opening to the second oil discharge plate. The first oil discharge plate is fixed to the main body portion and extends towards one axial side from the main body portion, and a first oil discharge passage communicated with the first oil inlet passage is formed. The second oil discharge plate is fixed to the main body portion and extends from the main body portion toward one side in the axial direction, and a second oil discharge passage communicated with the second oil inlet passage is formed.

In this way, the opening of the first projecting portion or the opening of the second projecting portion can effectively collect the lubricating oil on the outer surface (may also be referred to as the outer peripheral surface) of the outer peripheral wall of the main body portion by the action of the centrifugal force during the rotation of the oil collecting ring in any direction without completely depending on the clearance between the main body portion and other components to collect the lubricating oil, thereby increasing the amount of the lubricating oil that the oil collecting ring can collect. Further, the first oil discharge plate and the second oil discharge plate are used for guiding lubricating oil to parts needing lubrication, such as pin bearings, and the like, so that the lubricating effect can be improved and the adverse effect of insufficient lubrication on the service life of the parts needing lubrication, such as the pin bearings, can be reduced due to the sufficient oil quantity of the lubricating oil.

Drawings

Fig. 1A is a schematic sectional view showing the structure of an in-wheel motor drive system for a vehicle.

Fig. 1B is a perspective view showing a partial structure of the in-wheel motor drive system for a vehicle in fig. 1A, in which a partial structure of a planetary gear reducer is shown.

Fig. 1C is a schematic sectional view showing the structure in fig. 1B.

Fig. 1D is a schematic perspective view showing the structure of the oil gathering ring in fig. 1B.

Fig. 2A is a perspective view illustrating the structure of an oil gathering ring according to an embodiment of the present application.

Fig. 2B is a schematic perspective view showing a partial structure of the oil gathering ring in fig. 2A.

Fig. 2C is another perspective view showing a partial structure of the oil gathering ring in fig. 2A.

Description of the reference numerals

10 casing S installation space 20 drive motor 30 planetary gear reducer 301 planetary gear 302 planetary gear carrier 303 pin shaft 304 oil collecting ring 3041 main body part 3042 oil discharging plate 3043 clamping part 305 pin shaft bearing 40 output shaft

1 peripheral wall 1c of side wall 12 of main body part 11 first projection 21o first opening 21p first oil inlet passage 22 second projection 22o second opening 31 first oil discharge plate 31p first oil discharge passage 32 second oil discharge plate 32p second oil discharge passage 33 common side wall 4 flange part 5 catching part

And C, circumferential direction.

Detailed Description

Exemplary embodiments of the present application are described below with reference to the accompanying drawings. It should be understood that the detailed description is only intended to teach one skilled in the art how to practice the present application, and is not intended to be exhaustive or to limit the scope of the application.

In the present application, unless otherwise specified, "axial direction", "radial direction" and "circumferential direction" refer to the axial direction, the radial direction and the circumferential direction of the oil collecting ring, respectively. "one circumferential side" means an upstream side in the clockwise direction in fig. 2A, and "the other circumferential side" means a downstream side in the clockwise direction in fig. 2A.

The structure of the oil collecting ring according to an embodiment of the present application is described below with reference to the accompanying drawings of the specification.

As shown in fig. 2A to 2C, the oil gathering ring according to an embodiment of the present application includes a main body portion 1, a first protruding portion 21, a second protruding portion 22, a first oil drain plate 31, a second oil drain plate 32, a flange portion 4, and a snap-in portion 5, which are formed in one body. The oil collecting ring can be installed on a planet carrier of a planetary gear mechanism in a hub motor driving system and is used for collecting lubricating oil and guiding the lubricating oil into a planet wheel shaft (pin shaft) of the planetary gear mechanism, so that the lubricating effect on a bearing on the planet wheel shaft is improved.

In the present embodiment, as shown in fig. 2A, the main body portion 1 has a circular ring shape as a whole. As shown in fig. 2B, the body portion 1 includes an outer peripheral wall 12 and two side walls 11 extending radially inward from both axial end edges of the outer peripheral wall 12. The peripheral wall 12 and the two side walls 11 each extend along the circumferential direction C, and the two side walls 11 have the same radial dimension. Thus, a circumferential groove 1c that opens toward the radially inner side is formed between the outer circumferential wall 12 and the two side walls 11. When the oil gathering ring rotates, the lubricating oil that enters the circumferential groove 1c can flow along the circumferential groove 1 c.

In the present embodiment, as shown in fig. 2A, one first projecting portion 21 and one second projecting portion 22 constitute one set of projecting portions 21, 22, four sets of such projecting portions 21, 22 are provided in the circumferential direction C of the oil gathering ring, the four sets of projecting portions 21, 22 are evenly distributed in the circumferential direction C, and the projecting portions 21, 22 of adjacent sets are spaced apart from each other.

In the present embodiment, as shown in fig. 2A to 2C, the first projecting portion 21 partially projects toward the radial outside from the outer peripheral wall 12 of the main body portion 1. A portion of the first boss portion 21 protruding from the outer peripheral wall 12 is formed with a first opening 21o located radially outward of the outer peripheral wall 12 and open to one side in the circumferential direction. The first boss portion 21 is also formed with a first oil intake passage 21p extending from the first opening 21o to the first oil discharge plate 31. A first radially outer side wall surface of the first projecting portion 21 for forming the first oil inlet passage 21p is an arc-shaped surface, and the first radially outer side wall surface extends toward the radially inner side while extending toward the other side in the circumferential direction from the first opening 21 o. Thus, when the oil gathering ring is rotated toward the circumferential side, the lubricating oil that enters the first oil inlet passage 21p from the first opening 21o can be guided along the first radially outer side wall surface.

In the present embodiment, as shown in fig. 2A to 2C, the second projecting portion 22 partially projects toward the radial outside from the outer peripheral wall 12 of the main body portion 1. A portion of the second boss 22 protruding from the outer peripheral wall 12 is formed with a second opening 22o located radially outward of the outer peripheral wall 12 and open to the other circumferential side. The second boss 22 is also formed with a second oil inlet passage extending from the second opening 22o to the second oil discharge plate 32. A second radially outer side wall surface of the second projecting portion 22 for forming the second oil inlet passage is an arc-shaped surface, and the second radially outer side wall surface extends toward the radially inner side while extending toward the circumferential one side from the second opening 22 o. Thus, when the oil gathering ring is rotated toward the other circumferential side, the lubricating oil entering the second oil inlet passage from the second opening 22o can be guided along the second radially outer side wall surface.

In the present embodiment, as shown in fig. 2A to 2B, the first oil discharge plate 31 extends from the main body portion 1 toward one side in the axial direction, and is formed with a first oil discharge passage 31p that communicates with the first oil intake passage 21 p. A third radially outer side wall surface of the first oil discharge plate 31 for forming the first oil discharge passage 31p is an arc-shaped surface, and the third radially outer side wall surface is connected to a radially inner end of the first radially outer side wall surface. In this way, both the lubricating oil that enters the circumferential groove 1c and the lubricating oil that enters the first oil intake passage 21p via the first opening 21o of the first projecting portion 21 can eventually enter the first oil discharge passage 31p and be guided by the first oil discharge plate 31.

In the present embodiment, as shown in fig. 2A to 2B, the second oil discharge plate 32 extends from the main body portion 1 toward one side in the axial direction, and is formed with a second oil discharge passage 32p that communicates with the second oil intake passage, and a fourth radially outer wall surface of the second oil discharge plate 32, which is used to form the second oil discharge passage 32p, is an arc-shaped surface, and is connected to a radially inner end of the second radially outer wall surface. In this way, either the lubricating oil that enters the circumferential groove 1c or the lubricating oil that enters the second oil inlet passage via the second openings 22o of the second projecting portion 22 can eventually enter the second oil discharge passage 32p and be guided by the second oil discharge plate 32.

Further, for one set of bosses 21, 22, the first and second oil discharge plates 31, 32 are adjacent to each other and arranged side by side. The first oil drain plate 31 and the second oil drain plate 32 have a common side wall 33 extending in the axial direction, the common side wall 33 extending into the circumferential groove 1c to block the circumferential groove 1 c. Due to the existence of the common side wall 33, the lubricating oil collected by the first protruding part 21 flows to the position of the common side wall 33 and then is blocked by the common side wall 33, so that the lubricating oil can be guided and discharged by the first oil discharge plate 31; the lubricating oil collected via the second boss 22 is blocked by the common side wall 33 after flowing to the position of the common side wall 33, and can be guided and discharged by the second oil discharge plate 32. In the present embodiment, the first protruding portion 21 and the first oil drain plate 31 are symmetrically distributed with respect to a straight line extending through the common side wall 33 in a radial direction from a corresponding center of the main body portion 1, and the second protruding portion 22 and the second oil drain plate 32 are symmetrically distributed.

In the present embodiment, as shown in fig. 2A to 2C, the flange portion 4 projects radially outward from one axial end edge of the main body portion 1, and the first projecting portion 21 and the second projecting portion 22 are located on the other axial end of the flange portion 4. In fact, in the present embodiment, the flange portion 4 constitutes a part of the side walls of the first oil inlet passage 21p and the second oil inlet passage.

In the present embodiment, as shown in fig. 2A, the plurality of snap-in portions 5 are evenly distributed at intervals in the circumferential direction C of the oil gathering ring. Each snap-in portion 5 extends from the main body portion 1 toward one axial side, and each snap-in portion 5 may include a plurality of (e.g., pairs of) snaps, so that the oil collecting ring can be snapped, for example, to a predetermined position of a planetary gear mechanism of an in-wheel motor drive system.

The present application further provides a planetary gear mechanism including an oil gathering ring as described above. Specifically, the planetary gear mechanism further comprises a sun gear, a planet gear carrier and a gear ring, wherein the planet gear is located on the radial outer side of the sun gear and is always meshed with the sun gear, and the gear ring is located on the radial outer side of the planet gear and is always meshed with the planet gear. The planetary gear mechanism further comprises a planetary gear shaft and a bearing, the planetary gear is mounted on the planetary gear shaft, the planetary gear shaft is fixed with the planetary gear carrier, the bearing is located between the planetary gear and the planetary gear shaft, and the oil collecting ring is fixed on the planetary gear carrier, so that the first oil discharging plate 31 and the second oil discharging plate 32 of the oil collecting ring extend into a center hole of the planetary gear shaft. Adjacent first and second oil discharge plates 31, 32 may extend into the central bore of the same planet wheel shaft. An example of the above-described bearing is a needle bearing.

When the oil collecting ring is installed in place, once the planetary gear mechanism starts to work, the oil collecting ring rotates along with the planetary gear mechanism. The oil on the outer surface (i.e., the outer peripheral surface) of the peripheral wall 12 of the main body portion 1 will enter the oil inlet passage via the opening of the boss portion, and then be discharged toward the planetary shaft via the oil discharge passage, and will eventually enter the bearing via the passage formed in the planetary shaft. Moreover, in the alternative in which the planetary gear mechanism is applied to the in-wheel motor drive system, the openings 21o, 22o of the protrusions 21, 22 can also hold up the oil located at the bottom of the housing of the in-wheel motor drive system, further increasing the amount of oil that the oil collecting ring can collect. Thereby, the lubrication effect on the bearing is improved.

It should be understood that the above-described embodiments are exemplary only, and are not intended to limit the present application. Various modifications and alterations of the above-described embodiments may be made by those skilled in the art in light of the teachings of this application without departing from the scope thereof. Further, supplementary explanation is made as follows.

i. It is understood that, in the set of the protrusions 21, 22, the first protrusion 21 has the first opening 21o open to one side in the circumferential direction and the second protrusion 22 has the second opening 22o open to the other side in the circumferential direction, so that a good oil collecting function can be exerted regardless of which side in the circumferential direction the oil collecting ring rotates. Further, although in the above embodiment, it is described that four sets of the convex portions 21, 22 are arranged in the circumferential direction C of the oil gathering ring, the present application is not limited thereto, and any number of sets of the convex portions 21, 22 may be arranged in the circumferential direction C of the oil gathering ring as needed.

Preferably, the number of sets of lobes 21, 22 corresponds to the number of planet wheels of the planetary gear, so as to provide uniform and sufficient lubrication of the bearings on each planet wheel shaft.

From the above description, it can be understood that the oil gathering ring according to the present application can achieve the function of actively pumping lubricating oil without affecting the oil gathering effect due to the small clearance between the oil gathering ring and other parts as in the prior art. In fact, the faster the rotational speed of the oil collecting ring according to the application, the stronger this pumping effect.

in the above specific embodiment, the outer peripheral wall 12 of the main body portion 1 is cut off from extending to the openings 21o, 22o of the protrusions 21, 22, but the present application is not limited thereto. It is to be understood that the outer peripheral wall 12 of the main body portion 1 may continue to extend beyond the openings 21o, 22o as long as the outer peripheral portion 12 does not block the oil inlet passages of the convex portions 21, 22 and the oil discharge passages of the oil discharge plates 31, 32. Further, in this modification, the circumferential groove 1c of the main body portion 1, the oil inlet passages of the convex portions 21, 22, and the oil discharge passages of the oil discharge plates 31, 32 can be brought into communication.

A planetary gear mechanism including the oil gathering ring of the present application may be applied to in-wheel motor drive systems, as well as other applications where it is desired.