CN215171920U

CN215171920U - Planetary gear train bearing lubricating assembly

Info

Publication number: CN215171920U
Application number: CN202121066551.XU
Authority: CN
Inventors: 顾俊; 吴云峰
Original assignee: Zf Transmission Technology Jiaxing Co ltd
Current assignee: Zf Transmission Technology Jiaxing Co ltd
Priority date: 2021-05-18
Filing date: 2021-05-18
Publication date: 2021-12-14
Anticipated expiration: 2031-05-18

Abstract

The utility model provides a planetary gear train bearing lubricating component, the planetary gear train comprises a sun gear, a planet carrier and a gear ring, the planet gear is arranged between the sun gear and the gear ring; the planetary gear train bearing lubrication assembly comprises: a planetary gear shaft, the planetary gear being rotatably connected to the planetary carrier based on at least one of the planetary gear shafts; a needle bearing is arranged between the planet wheel and the planet wheel shaft; a through hole is formed in the planet wheel shaft; the oil collecting element is arranged on each planetary gear shaft and extends in a curve, a pipeline is arranged inside the oil collecting element, the first end of the pipeline is communicated with the inside of a shell of the planetary gear train, and the second end of the pipeline is communicated with a through hole in the planetary gear shaft, so that the pipeline and the through hole form a flow channel; the application realizes effective lubrication of the needle bearing when the planetary gear train is applied to an electric drive system.

Description

Planetary gear train bearing lubricating assembly

Technical Field

The utility model relates to a planetary gear train technical field, specifically speaking relates to a planetary gear train bearing lubrication assembly.

Background

An electric drive system typically includes a motor module and a reduction gearbox, with an output shaft of the motor delivering power to a reduction mechanism in the reduction gearbox. Planetary gear train as a kind of gear drive mechanism with small volume, light weight, high bearing capacity, large power density, coaxial output and other advantages is commonly used in reduction box and gear box as the above-mentioned retarding mechanism.

But the lubrication conditions of the planetary gear train are generally poor compared with the fixed-axis gear transmission. When the planet row is applied to the traditional automobile, the rotating speed of each rotating part is not high, and the use requirement can be basically met by adopting oil bath splash lubrication. However, when the device is applied to an electric drive system, because the input rotating speed is very high, it is difficult to ensure that all rotating parts, especially needle roller bearings, are fully lubricated and radiated.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a planetary gear train bearing lubrication assembly realizes carrying out effective lubrication to needle bearing when being applied to planetary gear train in electric drive system.

According to an aspect of the present invention, there is provided a planetary gear train bearing lubrication assembly, the planetary gear train including a sun gear, a planetary carrier, and a ring gear, the planetary gear being disposed between the sun gear and the ring gear; the planetary gear train bearing lubrication assembly comprises:

a planetary gear shaft, the planetary gear being rotatably connected to the planetary carrier based on at least one of the planetary gear shafts; a needle bearing is arranged between the planet wheel and the planet wheel shaft; a through hole is formed in the planet wheel shaft; and

the oil collecting element is arranged on each planetary gear shaft and extends in a curve, a pipeline is arranged inside the oil collecting element, the first end of the pipeline is communicated with the inside of a shell of the planetary gear train, and the second end of the pipeline is communicated with a through hole in the planetary gear shaft, so that the pipeline and the through hole form a flow channel.

Optionally, a side wall of the oil collecting piece is provided with an opening, and the second end of the internal pipeline of the oil collecting piece is communicated with the through hole in the planet wheel shaft based on the opening.

Optionally, the oil collecting element has an open end and a closed end disposed opposite to the open end, the side walls of the oil collecting element enclose the conduit, and the lubricating oil in the housing of the planetary gear train enters the conduit from the open end.

Optionally, the cross-sectional area of the oil collector is gradually reduced along the direction from the open end to the closed end.

Optionally, the opening end of the oil collecting piece is in a slope shape, and the inclined direction of the opening end is consistent with the rotation direction of the planet carrier.

Optionally, the direction of curvilinear extension of the oil collector coincides with the direction of rotation of the planet carrier.

Optionally, a gear is arranged on the periphery of the planet gear, and the gear on the planet gear is in meshing transmission with the gear on the gear ring to realize rotation of the planet gear.

Optionally, the oil collector has an extension that extends beyond an outer edge of the planet in a radial direction of the planet carrier.

Optionally, an oil pool is arranged in a shell of the planetary gear train, and when the planet gears rotate to the lowest point along with the planet carrier, gears on the planet gears are partially immersed in the oil pool.

Optionally, when the planet wheel rotates to the lowest point with the planet carrier, the gear on the planet wheel is immersed in the oil pool to half of the height of the gear.

Optionally, a mounting hole is formed in the oil collecting piece, and the oil collecting piece is screwed to the planetary gear shaft based on the mounting hole.

Compared with the prior art, the utility model beneficial effect lie in:

the utility model provides an above-mentioned oil collecting piece that planetary gear train bearing lubrication assembly extends through being equipped with the curve on the planet wheel axle, the pipeline that sets up in the oil collecting piece constitutes a flow path passageway that supplies the lubricating oil circulation jointly with the through-hole in the planet wheel axle, dip in the oil bath and collect lubricating oil when an oil collecting piece rotates to the low level, along with the rotation of planet carrier, when an oil collecting piece is rotatory to the high level from the low level, lubricating oil flows to two adjacent bearing's intermediate space through above-mentioned flow path, the realization is to bearing's effective lubrication.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

Fig. 1 is a schematic partial cross-sectional view of a planetary gear train according to an embodiment of the present invention;

fig. 2 is a front view of a planetary gear train according to an embodiment of the present invention;

fig. 3 is another partial cross-sectional view of the planetary gear train according to an embodiment of the present invention;

fig. 4 is a schematic view of an oil collecting element in the planetary gear train according to an embodiment of the present invention;

fig. 5 is another schematic view of an oil collecting element in the planetary gear train according to an embodiment of the present invention;

fig. 6 is another schematic diagram of an oil collecting element in the planetary gear train according to an embodiment of the present invention.

Reference numerals

The oil collecting device comprises a sun wheel-1, a planet wheel-2, a planet carrier-3, a gear ring-4, a planet wheel shaft-5, a needle bearing-6, an oil collecting piece-7, a reduction gearbox shell-8, a through hole-9, an oil pool-10, an opening-11 and an opening end-12;

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details, or with other methods, materials, devices, etc. In other instances, well-known technical solutions have not been shown or described in detail to avoid obscuring aspects of the present disclosure. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.

The terms "a," "an," "the," "said," and "at least one" are used to indicate the presence of one or more elements/components/parts/etc.; the terms "comprising," "having," and "providing" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.

As shown in fig. 1 to 3, the utility model discloses a planetary gear train bearing lubrication assembly. The planetary gear train includes a sun gear 1, planetary gears 2, a planetary carrier 3, and a ring gear 4, and the planetary gears 2 are provided between the sun gear 1 and the ring gear 4 in a radial direction thereof. The sun gear 1 is connected with an output shaft of the motor, and the gear ring 4 is fixed to the reduction gearbox shell 8.

The planetary gear train bearing lubricating component comprises a planetary gear shaft 5 and an oil collecting piece 7. The planetary gear 2 is rotatably fixed to the planetary carrier 3 based on at least one planetary gear shaft 5. The oil collector 7 extends along a curve and is arranged on the planet wheel shaft 5. Each planetary gear shaft 5 is provided with the oil collecting element 7. The planetary shaft 5 is also fixedly connected to the planetary carrier 3.

The planet wheel shaft 5 is provided with a through hole 9. A needle bearing 6 is provided between the planetary gear 2 and the planetary gear shaft 5. A pipeline is arranged inside the oil collecting piece 7. The first end of the pipe communicates with the inside of the housing of the planetary gear train, the second end of the pipe communicates with the through hole 9 in the planetary shaft 5, and the pipe and the through hole 9 constitute a passage for the flow of the lubricating oil (the direction of the arrow in fig. 3 indicates the flow path of the lubricating oil), so that the lubricating oil flows to the outer surface of the needle bearing 6.

That is, one end of the through hole 9 in the planet wheel shaft 5 is communicated with the inner pipeline of the oil collecting piece 7, and the other end is communicated with the middle space of the two adjacent needle roller bearings 6.

In this embodiment, a gear is disposed on the periphery of the planetary gear 2, and the gear on the planetary gear 2 and the gear on the ring gear 4 are in mesh transmission, so that the planetary gear 2 also rotates while rotating with the carrier 3. In the perspective illustration of fig. 2, the planet wheels 2 are largely obscured by the planet carrier 3. Fig. 2 shows a detail of 4

planet wheels

2, 4

planet wheel axles

5 and 4 oil collectors 7. The arrow direction in fig. 2 indicates the rotation direction of the planet carrier 3.

In this embodiment, the oil collecting member 7 has a fan-shaped longitudinal section. Referring to fig. 5, an opening 11 is formed on one side wall of the oil collecting member 7. The second end of the inner pipe of the oil collecting element 7 is communicated with the through hole 9 in the planet wheel shaft 5 based on the opening hole 11.

In the present embodiment, referring to fig. 4 to 6, the oil collecting member 7 has an open end 12 and a closed end disposed opposite to the open end 12, the side walls of the oil collecting member 7 enclose the conduit, and the lubricating oil in the housing of the planetary gear train enters the conduit from the open end 12 to collect the lubricating oil, and then the oil collecting member 7 rotates with the planetary carrier 3 because the planetary carrier 3 rotates, and when the oil collecting member 7 rotates from the low position to the high position, the lubricating oil flows to the space between two adjacent needle bearings 6 through the flow path passage, so as to effectively lubricate the needle bearings 6.

In this embodiment, an oil pool 10 is provided in the casing of the planetary gear train, and when a planetary gear 2 rotates to the lowest point along with the planetary carrier 3, the gear at the bottommost position (i.e. the lowest point relative to the bottom of the oil pool) on the planetary gear 2 is partially immersed in the oil pool 10. That is, the gear at the bottom most is not completely submerged in the oil bath 10. This can avoid the problem that the oil pool 10 covers an excessive portion of the planet carrier 3, resulting in churning loss and accelerated deterioration and reduction in life of the lubricating oil. As a preferred embodiment, when the planet wheel rotates to the lowest point along with the planet carrier, the gear which is positioned at the lowest point relative to the bottom of the oil pool is immersed in the oil pool to the depth which is half of the height of the gear.

Since the electric drive system is in practical use, the rotation speed of the vehicle drive motor is extremely high, in order to facilitate collection of the lubricating oil in the oil pool 10, in the prior art, the oil pool 10 covers too much of the planet carrier, and the lubricating oil is stirred too much, so that stirring loss of the lubricating oil and accelerated degradation of the lubricating oil are caused, and the service life is reduced. Therefore, in the present embodiment, the curved extending direction of the oil catcher 7 coincides with the rotation direction of the planet carrier 3. The oil collector 7 has an extension which, during rotation of the planet carrier 3, projects beyond the outer edge of the planet 2 in the radial direction of the planet carrier. Therefore, the contact area between the planet carrier 3 and the oil pool 10 is prevented from being too large, that is, the lubricating oil is prevented from being stirred too much, the stirring loss of the lubricating oil is reduced, and the degradation of the quality of the lubricating oil is slowed down. The outer edge of the planet wheel 2 is the outer circumferential profile of the planet wheel 2.

In this embodiment, the oil collecting member 7 is provided with a mounting hole. The oil collecting piece 7 is screwed with the planet wheel shaft 5 based on the mounting hole. Of course, the present application does not limit the connection manner between the oil collecting element 7 and the planetary gear shaft 5.

In another embodiment of the present application, based on any of the above embodiments, the opening end 12 of the oil collecting member 7 is shaped like a slope, and the inclined direction of the opening end 12 coincides with the rotation direction of the planet carrier 3. This is advantageous for reducing the churning loss of the lubricating oil and slowing down the deterioration of the quality of the lubricating oil.

In another embodiment of the present application, on the basis of any of the above-mentioned embodiments, the cross-sectional area of the oil collecting member 7 is gradually reduced along the direction from the open end 12 to the closed end. Therefore, the lubricating oil can be collected conveniently, and the collection efficiency of the lubricating oil is improved.

In the prior art, a planetary gear train generally implements forced lubrication of a needle bearing through an oil pump and an oil passage. The pressure oil output by the oil pump is input to the through hole inside the planet carrier through different paths. Since the planet carrier is often used as a power output member, it is difficult for the pressure oil output from the oil pump to enter the planet carrier rotating at high speed, and a structure such as a seal ring or a seal ring for inputting the oil from the fixed member to the rotating member needs to be added, which is costly. This application collects lubricating oil through the collection oil spare that sets up the curve extension on the planet wheel axle and can realize the lubrication to bearing, need not set up oil pump and sealing washer, low cost.

To sum up, the utility model discloses a planetary gear train bearing lubrication assembly has following advantage at least:

the planetary gear train bearing lubricating assembly disclosed by the embodiment is characterized in that the oil collecting piece extending in a curve is arranged on the planetary gear shaft, a pipeline arranged in the oil collecting piece and a through hole in the planetary gear shaft jointly form a flow path channel for lubricating oil to flow through, the oil collecting piece is immersed in an oil pool and collects the lubricating oil when rotating to a low position, and along with the rotation of the planetary carrier, the lubricating oil flows to an intermediate space between two adjacent needle bearings through the flow path channel when the oil collecting piece rotates from the low position to the high position, so that the effective lubrication of the needle bearings is realized; and this lubricated subassembly need not set up oil pump and sealing washer etc. low cost, and practical value is higher.

In the description of the present invention, it is to be understood that the terms "bottom", "longitudinal", "lateral", "up", "down", "front", "back", "vertical", "horizontal", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and simplification of description, but do not indicate or imply that the structures or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more and "several" means one or more unless otherwise specified.

In the description herein, references to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims

1. A planetary gear train bearing lubrication assembly is characterized in that the planetary gear train comprises a sun gear (1), a planet gear (2), a planet carrier (3) and a gear ring (4), wherein the planet gear (2) is arranged between the sun gear (1) and the gear ring (4); the planetary gear train bearing lubrication assembly comprises:

a planet wheel shaft (5), the planet wheel (2) being rotatably connected to the planet carrier (3) based on at least one planet wheel shaft (5); a needle bearing (6) is arranged between the planet wheel (2) and the planet wheel shaft (5); a through hole (9) is formed in the planet wheel shaft (5); and

the oil collecting element (7) is arranged on each planetary gear shaft (5) and extends in a curve, a pipeline is arranged inside the oil collecting element (7), the first end of the pipeline is communicated with the inside of a shell of the planetary gear train, and the second end of the pipeline is communicated with a through hole (9) in the planetary gear shaft (5), so that the pipeline and the through hole (9) form a flow channel.

2. Planetary gear train bearing lubrication assembly according to claim 1, wherein an opening (11) is provided in a side wall of the oil collecting member (7), and the second end of the inner conduit of the oil collecting member (7) communicates with the through hole (9) in the planetary gear shaft (5) based on the opening (11).

3. A planetary gear train bearing lubrication assembly as claimed in claim 1, wherein said oil gathering member (7) has an open end (12) and a closed end disposed opposite said open end (12), and wherein the side walls of said oil gathering member (7) enclose said conduit, and wherein lubricating oil located in the casing of said planetary gear train enters said conduit from said open end (12).

4. A planetary gear train bearing lubrication assembly according to claim 3, characterised in that the cross-sectional area of the oil collector (7) is gradually reduced in a direction from the open end (12) towards the closed end.

5. A planetary gear train bearing lubrication assembly according to claim 3, characterised in that the open end (12) of the oil collector element (7) is ramp-shaped and the inclined direction of the open end (12) coincides with the direction of rotation of the planet carrier (3).

6. A planetary gear train bearing lubrication assembly according to claim 1, characterised in that the direction of curvilinear extension of the oil collecting element (7) coincides with the direction of rotation of the planet carrier (3).

7. A planetary gear train bearing lubrication assembly as claimed in claim 1, wherein the periphery of the planet wheel (2) is provided with a gear, and the gear on the planet wheel (2) is in meshing transmission with the gear on the ring gear (4) to realize the rotation of the planet wheel (2).

8. A planetary gear train bearing lubrication assembly according to claim 1, characterised in that the oil collecting element (7) has an extension which extends in the radial direction of the planet carrier (3) beyond the outer edge of the planet wheels (2).

9. Planetary gear train bearing lubrication assembly according to claim 7, characterised in that an oil sump (10) is provided in the housing of the planetary gear train, the gears on the planet wheels (2) being partially immersed in the oil sump (10) when the planet wheels (2) rotate with the planet carrier (3) to the lowest point.

10. A planetary gear train bearing lubrication assembly according to claim 9, characterised in that when the planet wheels (2) rotate with the planet carrier (3) to the lowest point, the depth to which the gears on the planet wheels (2) are immersed in the oil sump (10) is half the height of the gears.

11. Planetary gear train bearing lubrication assembly according to claim 1, wherein the oil collecting element (7) is provided with a mounting hole, based on which the oil collecting element (7) is screwed to the planetary gear shaft (5).