CN221075190U

CN221075190U - Lubrication system for a planetary gear arrangement and planetary gear system

Info

Publication number: CN221075190U
Application number: CN202323145498.4U
Authority: CN
Inventors: 曲广涛
Original assignee: Bosch Rexroth Beijing Hydraulic Co Ltd
Current assignee: Bosch Rexroth Beijing Hydraulic Co Ltd
Priority date: 2023-11-21
Filing date: 2023-11-21
Publication date: 2024-06-04
Anticipated expiration: 2033-11-21

Abstract

The application provides a lubrication system for a planetary gear structure, characterized by comprising: an oil slinger (1), the oil slinger (1) being configured to be carried and slinger lubricating oil circumferentially relative to the drive shaft (3); the oil path channel (2) is in fluid communication with the oil throwing part (1), and the oil path channel (2) is arranged in a supporting shaft (4) of a planetary gear structure, which is arranged around the outer edge of the oil throwing part (1); wherein the oil slinger (1) is configured to be driven by the drive shaft (3) for rotational movement so that lubricating oil carried by it can reach the main bearing (5) of the planetary gear structure and the bearing (7) of the planetary gear (6) located above through the oil path passage (2).

Description

Lubrication system for a planetary gear arrangement and planetary gear system

Technical Field

The present application relates to lubrication systems, and in particular to lubrication systems for planetary gear arrangements. In addition, the application also relates to a planetary gear system.

Background

In some transmissions, such as a speed reducer, a planetary gear system is employed. The structure has the advantages of compact structure, stable operation and the like.

However, since the structure of the planetary gear system itself is relatively complex, the probability of occurrence of wear, etc. and the damage caused take a considerable weight. To cope with this problem, the prior art often employs various schemes to lubricate gears and bearings in planetary gear systems, such as oil baths, splash lubrication, and the like. However, the gears and/or bearings located on top still do not receive sufficient lubrication oil to be used, for example due to gravitational effects, existing structures and/or operation of the planetary gear system, etc.

In view of, but not limited to, the various situations described above, it would be desirable to provide a novel lubrication system and/or planetary gear system that addresses at least the problems described above.

Disclosure of utility model

The present application aims to provide a lubrication system for a planetary gear structure which is advantageous in at least one respect over the prior art.

To this end, the present application provides in one aspect a lubrication system for a planetary gear structure comprising: an oil slinger configured to be able to carry and sling lubricating oil circumferentially relative to a drive shaft; the oil path channel is in fluid communication with the oil throwing part and is arranged in a supporting shaft of the planetary gear structure, which is arranged around the outer edge of the oil throwing part; wherein the oil slinger is configured to be driven by the drive shaft for rotational movement so that lubricating oil carried thereby can reach the main bearing of the planetary gear structure and the bearings of the planetary gears located above through the oil passage.

In one possible embodiment, the oil slinger is embodied in such a way that the oil slinger can be arranged coaxially with the drive shaft of the planetary gear arrangement, and wherein the oil channel opens into the bearing shaft by way of a slot drilled from an opening.

In one possible embodiment, the oil passage comprises a first section extending radially outwardly from the outer periphery of the oil slinger.

In a possible embodiment, the oil passage further comprises a second section perpendicular to the first section and extending in the direction of power transmission, wherein the second section extends towards the upstream direction of power transmission to approach the main bearing and the second section extends in the downstream direction of power transmission to approach the bearing of the planetary gear.

In one possible embodiment, the second section is directed towards an opening extending in the upstream direction of the power transmission and ending at the bearing shaft surface.

In a possible embodiment, the oil passage further comprises a third section extending outwardly from the second section in a radial direction and ending in the main bearing and the bearing of the planetary gear, respectively.

In one possible embodiment, the extension direction of the third section is arranged parallel to the extension direction of the first section.

In one possible embodiment, the oil passage further comprises a fourth section, wherein the fourth section extends radially inward from the second section and terminates in a recess that accommodates an engine associated with the planetary gear arrangement.

In one possible embodiment, the lubrication system for a planetary gear structure further comprises: a filter screen shaped and sized to be placed through the aperture in the second section of the oil passage.

The application also relates in another aspect to a planetary gear system comprising: a planetary gear structure; and a lubrication system for a planetary gear structure as described above.

The lubricating system for the planetary gear structure has a targeted lubricating oil channel, is quite advantageous compared with the technical scheme disclosed by the prior art, can more fully utilize oil drops thrown out by the oil throwing part, accurately transmits the oil drops to gears and/or bearings needing to be lubricated through an oil duct, and improves the current situation that the gears and/or bearings positioned at the upper part can receive and use insufficient lubricating oil.

Drawings

Fig. 1 shows a longitudinal section of a lubrication system according to an embodiment of the application.

Fig. 2 shows a cross-sectional view of a lubrication system according to an embodiment of the application.

Fig. 3 shows a screen used in the lubrication system of fig. 1-2.

Detailed Description

Some possible embodiments of the application are described below with reference to the accompanying drawings. It is noted that the figures are not drawn to scale. Some details may be exaggerated for clarity of presentation and some details not necessarily shown have been omitted.

1-2, A lubrication system according to one embodiment of the present application is shown. The lubrication system is adapted to the planetary gear structure. The lubrication system includes: the oil slinger 1, the oil slinger 1 can be configured into a hollow basic circular ring (or cylinder) shape; and an oil passage 2 in fluid communication with the oil slinger 1.

The oil slinger 1 is configured to be driven by the drive shaft 3 to perform rotational movement, and to carry and sling lubricating oil circumferentially with respect to the drive shaft (3). Additionally, the oil slinger 1 may be arranged coaxially with the drive shaft 3 of the planetary gear system (e.g. around the drive shaft 3). The drive shaft 3 may be or be associated with an input shaft of a planetary gear system (e.g. the drive shaft 3 is driven by the input shaft). Alternatively, such a slinger 1 may be constructed as a special slinger or may be integrated with other components of the planetary gear structure (e.g. blades capable of performing slinging actions, etc.), as long as the function thereof is achieved.

During actual use, the planetary gear structure with the lubrication system (with a portion thereof) is injected with lubricating oil to form an oil bath. In this way, on the one hand, a first part of the oil slinger 1 located below (e.g. below the level at which the drive shafts 3 are collinear) is immersed in the oil bath. Correspondingly, the first part can acquire and carry sufficient oil for subsequent throwing out; and the gears and/or bearings located below the first part can also be sufficiently lubricated to obtain a good lubrication effect due to being in the oil bath. On the other hand, a second portion of the oil slinger 1, which is located above (e.g., above the collinear horizontal line of the drive shaft 3), is exposed to the outside, i.e., not immersed by the oil bath, outside the space in which the oil bath is located. Correspondingly, the second part carries oil obtained from the oil bath and throws the carried oil outwards through the inertia of the rotation of the oil throwing part 1; and due to the cooperation of the oil slinger 1 and the oil passage 2 disclosed herein in fluid communication with the oil slinger 1, the gears and/or bearings located above the second section are also able to achieve adequate lubrication, as described in more detail herein.

The planetary gear structure further comprises a supporting shaft 4 arranged around the outer edge of the oil slinger 1. The oil passage 2 is provided in the support shaft 4. For example, the oil passage 2 is opened in the support shaft 4 by means of drilling and grooving (for example, from the opening 41).

The oil passage 2 comprises a first section 21 extending radially (relative to the direction of rotation of the oil slinger) outwards from the outer periphery of the oil slinger 1. In this way, the oil thrown out of the oil slinger 1 may be restricted to flow along the first section 21.

The oil passage 2 further includes a second section 22 that is perpendicular (in the axial direction) with respect to the first section 21 and extends in the direction of power transmission. The second section 22 on the one hand faces an opening 41 extending in the upstream direction of the power transmission to approach the main bearing 5 and ending at the surface of the bearing shaft 4, wherein through said opening 41 lubricating oil can drain. The second section 22 on the other hand extends in the downstream direction of the power transmission to approach the bearing 7 of the planetary gear 6. The second section 22 may be shaped as a cylinder.

The oil passage 2 further includes a third section 23 extending outwardly from the second section 22 in the radial direction and terminating in the main bearing 5 (in the upstream direction) and the bearing 7 (in the downstream direction) of the planetary gear 6, respectively. The third section 23 may be configured to be substantially parallel to the first section 21.

In use, the oil slinger 1 is partially immersed in a bath of lubricating oil, the oil slinger 1 being driven by the drive shaft 3 to rotate about the drive shaft 3, the rotational inertia of the oil slinger 1 being used to agitate the lubricating oil from the bath and to transport the lubricating oil by centrifugal force to the first section 21 of the oil passage 2. The lubricating oil in the first section 21 is further pushed into the second section 22 at least due to the rotation action and the hydraulic and/or hydrodynamic action of the oil body and flows in the upstream direction and downstream direction respectively so as to be evenly distributed in the second section 22. Due to the communication and relative positional relationship of the third section 23 and the second section 22, the lubricating oil in the second section 22 is able to flow through the third section 23 and to the respective bearings further by means of inertial forces and relative pressures: a main bearing 5 and a planetary gear bearing 7. In this way, the splashed lubricating oil carried by the oil slinger 1 can be applied more efficiently and more specifically to the bearings to be lubricated, thereby avoiding the problems of the prior art that the lubricating oil is wasted and the bearings are not lubricated effectively.

In one embodiment, the oil passage 2 may further include a fourth section 24. The fourth section 24 extends radially inwardly from the second section 22 and terminates in a recess 9 which receives an engine 8 (the output shaft of which is shown in phantom in fig. 1) associated with a planetary gear arrangement. With this construction, a part of the lubricating oil in the second section 22 located below (at least because it is located in the oil bath) can flow into the groove 9 along the fourth section 24 located below due to the hydraulic pressure and further into the second section 22 located above through the fourth section 24 located above, thereby further facilitating the lubrication of the bearing(s) located above.

In one embodiment, as shown in fig. 3, the lubrication system may further include a filter screen 10 and an oil plug 11 coupled thereto. The plug 11 can fix the filter screen 10 and close the opening 41. The plug 11 may for example take the form of a detachable joint. The filter screen 10 is shaped and sized to be placed in the second section 22 of the oil passage 2 through the opening 41. For example, the filter screen 10 may be configured to have a cylindrical structure of a certain length. In the second section 22, the filter screen 10 is placed, the length extending along the length of the second section, in other words, parallel to the radial direction of the rotation axis.

The filter screen 10 is disposed in the oil passage 2 so as to trap impurities in the lubricating oil in the filter screen 10, thereby purifying the lubricating oil in the oil passage 2. This reduces the amount of oil containing impurities carried to the bearings causing wear and even damage thereto. The filter screen 10 may be reusable. For example, at intervals, the filter screen 10 may be removed from the opening 41 and cleaned, and then reinserted from the opening 41 into the oil passage 2. Or filter screen 10 may be disposable. In this way, after a lapse of time, the filter screen 10 is taken out of the opening 41, and then a new filter screen 10 is fitted into the oil passage 2 via the opening 41.

The application also discloses a planetary gear system. Such a planetary gear system comprises a planetary gear structure and a lubrication system for a planetary gear structure as disclosed in the present application.

The terms "radial", "axial" and "circumferential" as used herein are defined with respect to the axis of rotation of the oil slinger.

As used herein, the term "comprising" is open ended and includes one or more stated features, elements, components, or functions, but does not preclude the presence or addition of one or more other features, elements, components, functions, or groups thereof.

Within the scope of the application it is expressly intended that the various aspects, embodiments, examples and alternatives listed in the preceding paragraphs, claims and/or in the following description and drawings, and in particular the individual features thereof, can be carried out independently or in any combination. That is, features of all embodiments and/or any embodiments may be combined in any manner and/or combination unless such features are incompatible. Applicant reserves the right to correspondingly change any originally presented claim or submit any new claim, including modifying any originally presented claim to depend on and/or incorporate any feature of any other claim, although not originally claimed in this manner.

Although the application is described herein with reference to specific embodiments, the scope of the application is not intended to be limited to the details shown. Various modifications may be made to these details without departing from the underlying principles of the application.

Claims

1. A lubrication system for a planetary gear structure, comprising:

An oil slinger (1), the oil slinger (1) being configured to be carried and slinger lubricating oil circumferentially relative to the drive shaft (3); and

An oil path channel (2) in fluid communication with the oil slinger (1), the oil path channel (2) being provided in a support shaft (4) of a planetary gear structure arranged around the outer edge of the oil slinger (1);

Wherein the oil slinger (1) is configured to be driven by the drive shaft (3) for rotational movement so that lubricating oil carried by it can reach the main bearing (5) of the planetary gear structure and the bearing (7) of the planetary gear (6) located above through the oil path passage (2).

2. Lubrication system for a planetary gear structure according to claim 1, characterized in that the oil slinger (1) is realized as an oil slinger and can be arranged coaxially with the drive shaft (3) of the planetary gear structure, and wherein the oil channel (2) is open in the bearing shaft (4) by means of drilling a slot from an opening (41).

3. Lubrication system for a planetary gear structure according to any of claims 1-2, characterized in that the oil channel (2) comprises a first section (21) extending radially outwards from the outer periphery of the oil slinger (1).

4. A lubrication system for a planetary gear structure according to claim 3, characterized in that the oil passage (2) further comprises a second section (22) perpendicular with respect to the first section (21) and extending in the direction of power transmission, wherein the second section (22) extends towards the bearing (7) in the upstream direction of power transmission to approach the main bearing (5) and the second section (22) extends in the downstream direction of power transmission to approach the planetary gear (6).

5. Lubrication system for a planetary gear structure according to claim 4, characterized in that the second section (22) is directed towards an aperture (41) extending in the upstream direction of the power transmission and ending at the surface of the supporting shaft (4).

6. Lubrication system for a planetary gear structure according to any of claims 4-5, characterized in that the oil channel (2) further comprises a third section (23) extending outwards in a radial direction from the second section (22) and ending in the main bearing (5) and the bearing (7) of the planetary gear (6), respectively.

7. Lubrication system for a planetary gear structure according to claim 6, characterized in that the extension direction of the third section (23) is arranged parallel to the extension direction of the first section (21).

8. Lubrication system for a planetary gear structure according to claim 6, characterized in that the oil channel (2) further comprises a fourth section (24), wherein the fourth section (24) extends radially inwards from the second section (22) and ends in a groove (9) accommodating an engine (8) associated with the planetary gear structure.

9. The lubrication system for a planetary gear structure according to claim 6, further comprising: a filter screen (10) shaped and sized to be placed through the aperture (41) in the second section (22) of the oil passage (2).

10. A planetary gear system characterized by comprising: a planetary gear structure; and

Lubrication system for a planetary gear structure according to any of claims 1-9.