Multi-connection planetary gear structure with lubricating system and gearbox

Abstract

The invention relates to the technical field of planetary gear structure lubrication, in particular to a multi-connection planetary gear structure with a lubrication system and a gearbox. The multi-connection planetary gear structure comprises an intermediate shaft; the planet carrier is rotatably installed on the intermediate shaft, the oil distribution sleeve is arranged on the intermediate shaft in a sleeving mode, a first ring groove is formed in the inner wall of the oil distribution sleeve, and a second ring groove is formed in the outer wall of a second bearing plate of the planet carrier; an oil way channel capable of being communicated with the outside is formed in the middle shaft, and the oil way channel can be communicated with an inner oil way of the planet pin shaft and can be communicated with a to-be-lubricated area of a planet wheel bearing inner ring. By means of the single oil inlet and the multiple oil holes extending in the radial direction, corresponding installation bearings of the multiple planet gears in the same phase can be lubricated at the same time, an additional sealing structure does not need to be arranged, the form is simple, and the multi-row compound planet gear can be suitable for various multi-row compound planet gears in the arrangement form.

Description

Technical Field

[0001] The present invention relates to the technical field of planetary gear structure lubrication, and in particular to a multi-connected planetary gear structure and a gearbox with a lubrication system. Background Art

[0002] Multi-row compound planetary gearboxes are increasingly being used in various high-end automobiles, engineering machinery, aerospace and military fields because they can achieve more complex transmission ratio changes and higher power density. High-end engineering machinery planetary gearboxes often involve double or even triple planetary gear structures. Key components such as planetary gear sets and bearings require sufficient and reliable lubrication and cooling during high-speed operation and frequent reversing, thereby reducing friction between components and extending the service life of the transmission mechanism.

[0003] However, the existing multi-row compound planetary gears are mostly double-linked planetary gears or multi-linked planetary gears with different phases. For different arrangements, a large number of oil inlets need to be arranged, and the sealing structures are complex and the lubrication system has poor applicability. Summary of the invention

[0004] The object of the present invention is to provide a multi-planetary gear structure and a gearbox with a lubrication system, wherein the internal oil passages of multiple planetary pins can be connected to the same oil inlet, and under the action of rotating centrifugal force, the lubricating oil entering through the oil passage at the intermediate shaft can simultaneously lubricate the corresponding mounting bearings of multiple planetary gears in the same phase through one oil inlet, without the need to arrange an additional sealing structure, the form is simple, and it can be applicable to various multi-row compound planetary gears under this arrangement.

[0005] In order to achieve the above object, the present invention adopts the following technical solution to solve the problem: In a first aspect, the present invention provides a multi-connected planetary gear structure with a lubrication system, comprising: Intermediate shaft; A planet carrier is rotatably mounted on the intermediate shaft, and the planet carrier comprises a first support plate, a second support plate and a third support plate; a first planet pin shaft and a second planet pin shaft are respectively mounted on the first support plate and the third support plate; a first planetary gear and a second planetary gear with the same phase are respectively mounted on the first planetary gear and the second planetary gear through planetary gear bearings; An oil distribution sleeve is sleeved on the intermediate shaft and located between the intermediate shaft and the second supporting plate, a first annular groove is formed on the inner wall of the oil distribution sleeve, and a second annular groove is formed on the outer wall of the second supporting plate; An oil passage that can communicate with the outside is formed inside the intermediate shaft. The oil passage is connected to the first annular groove and the first oil storage chamber between the intermediate shaft through a first oil hole in the intermediate shaft. The first oil storage chamber is connected to the second annular groove and the second oil storage chamber between the oil distribution sleeve through a second oil hole in the oil distribution sleeve; the second oil storage chamber can be connected to the internal oil passage of the first planetary pin shaft and the internal oil passage of the second planetary pin shaft through a third oil hole in the second supporting plate; the internal oil passage of the first planetary pin shaft and the internal oil passage of the second planetary pin shaft are respectively connected to the inner ring to-be-lubricated area of ​​the planetary wheel bearing for mounting the first planetary wheel and the second planetary wheel.

[0006] Optionally, the internal oil circuit of the first planetary pin shaft includes a first oil inlet hole connected to the third oil hole, and the first oil inlet hole is connected to the lubrication area of ​​the inner ring of the first planetary bearing through a first oil outlet hole in the first planetary pin shaft; the first planetary bearing is used to install the first planetary gear.

[0007] Optionally, the first oil inlet hole is connected to the second oil inlet hole of the internal oil circuit of the second planetary pin shaft through the connecting oil circuit in the second supporting plate, and the second oil inlet hole is connected to the lubrication area of ​​the inner ring of the second planetary bearing through the second oil outlet hole in the second planetary pin shaft, and the second planetary bearing is used to install the second planetary gear.

[0008] Optionally, it also includes: The third planetary gear is mounted on the second planetary pin shaft through a third planetary bearing; the second oil inlet hole is connected to the lubricated area of ​​the inner ring of the third planetary bearing through a third oil outlet hole in the second planetary pin shaft.

[0009] Optionally, the planet carrier comprises a fourth support plate, and the fourth support plate is arranged between the third planet gear and the second planet gear.

[0010] Optionally, it also includes: A first elastic pin, passing through the second supporting plate and inserted radially onto the first planetary pin shaft; The second elastic pin passes through the fourth supporting plate and is inserted into the second planetary pin shaft in the radial direction.

[0011] Optionally, any two adjacent ones of the first support plate, the second support plate, the third support plate and the fourth support plate are fixedly connected via columns.

[0012] Optionally, the first planetary pin is installed in a first pin hole on the first supporting plate; and the second planetary pin is installed in a second pin hole on the second supporting plate.

[0013] Optionally, the first oil hole, the second oil hole and the third oil hole are all arranged radially along the intermediate shaft.

[0014] In a second aspect, the present invention further provides a gearbox comprising the multi-connected planetary gear structure.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, multiple planetary gears are arranged in the same phase, and the internal oil passages of multiple planetary pins can be connected with the same oil inlet. The lubricating oil can lubricate all the planetary gear bearings of the entire planetary carrier from the intermediate shaft to the oil distribution sleeve through only one oil inlet. The oil passage structure is simple and the lubrication effect is better.

[0016] 2. The present invention does not need to additionally set up sealing rings and sealing ring structures in the lubrication system of the conventional multi-linked planetary gear structure. The entire planetary carrier has fewer processing surfaces and lower processing requirements, which reduces processing costs and saves sealing component costs.

[0017] 3. The lubricating oil circuit arrangement in the present invention has strong applicability and good expandability. If the number of planetary gear rows needs to be expanded, the newly arranged planetary gear can be connected to the oil inlet hole on the original planetary pin shaft through the newly opened radial oil outlet hole, without the need to arrange other structures, and has good applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of a multi-connected planetary gear structure in Example 1; Figure 2 for Figure 1 Schematic cross-section of some structures; The meanings of the reference numerals in the figure are as follows: 1. intermediate shaft; 2. oil passage; 3. first oil hole; 4. oil distribution sleeve; 5. first annular groove; 6. second oil hole; 7. planet carrier; 8. first supporting plate; 9. second supporting plate; 10. third supporting plate; 11. fourth supporting plate; 12. first column; 13. second column; 14. third column; 15. first pin hole; 16. second pin hole; 17. second annular groove; 18. third oil hole; 19. first planetary pin; 20. second planetary pin; 21. first oil inlet hole; 22. second oil inlet hole; 23. first oil outlet hole; 24. second oil outlet hole; 25. third oil outlet hole; 26. first planetary bearing; 27. second planetary bearing; 28. third planetary bearing; 29. ​​first planetary gear; 30. second planetary gear; 31. third planetary gear. DETAILED DESCRIPTION Example

[0019] like Figure 1As shown, this embodiment provides a multi-planetary gear structure with a lubrication system, which includes an intermediate shaft 1 and a planet carrier 7; the planet carrier 7 is rotatably mounted on the intermediate shaft 1. In a specific embodiment, the planet carrier 7 is connected to the intermediate shaft 1 or other parts on the intermediate shaft 1 connected to the intermediate shaft 1 through bearings or sleeves, and the planet carrier 7 and the intermediate shaft 1 can rotate relative to each other radially but are fixedly connected axially.

[0020] The planet carrier 7 includes a first support plate 8, a second support plate 9 and a third support plate 10; the first support plate 8 and the third support plate 10 are respectively mounted with a first planetary pin 19 and a second planetary pin 20; the first planetary pin 19 is mounted in a first pin hole 15 on the first support plate 8; the second planetary pin 20 is mounted in a second pin hole 16 on the second support plate 9. The first planetary pin 19 and the second planetary pin 20 are respectively mounted with a first planetary gear 29 and a second planetary gear 30 of the same phase through planetary gear bearings, and the intermediate shaft 1 can drive the first planetary gear 29 and the second planetary gear 30 to rotate through the sun gear. The first planetary gear 29 and the second planetary gear 30 are kept in the same phase so that the axes of the first planetary pin 19 and the second planetary pin 20 are in the same plane as the axis of the intermediate shaft, Figure 2 This is the cross-section of the plane.

[0021] Combination Figure 2 The multi-linked planetary gear structure further includes an oil distribution sleeve 4, which is sleeved on the intermediate shaft 1 and located between the intermediate shaft 1 and the second support plate 9. The inner wall of the oil distribution sleeve 4 forms a first annular groove 5, and the outer wall of the second support plate 9 forms a second annular groove 17. An oil passage 2 capable of communicating with the outside is formed inside the intermediate shaft 1. The oil passage 2 communicates with the first annular groove 5 and the first oil storage chamber between the intermediate shaft 1 through the first oil hole 3 in the intermediate shaft 1. The first oil storage chamber communicates with the second annular groove 17 and the second oil storage chamber between the oil distribution sleeve 4 through the second oil hole 6 in the oil distribution sleeve 4. The second oil storage chamber can communicate with the internal oil passage of the first planetary pin shaft 19 and the internal oil passage of the second planetary pin shaft 20 through the third oil hole 18 in the second support plate 9. The internal oil passage of the first planetary pin shaft 19 and the internal oil passage of the second planetary pin shaft 20 are respectively communicated with the inner ring lubrication area of ​​the planetary wheel bearing for mounting the first planetary wheel 29 and the second planetary wheel 30. The first oil hole 3 , the second oil hole 6 and the third oil hole 18 are all arranged along the radial direction of the intermediate shaft 1 .

[0022] In this embodiment, the first planetary gear 29 and the second planetary gear 30 are arranged in phase, so that the third oil hole 18 arranged radially can simultaneously connect the internal oil circuit of the first planetary pin shaft 19 and the internal oil circuit of the second planetary pin shaft 20 arranged axially; the internal oil circuits of the first planetary pin shaft 19 and the second planetary pin shaft 20 are connected to the inner ring area to be lubricated of the planetary wheel bearing, and the area to be lubricated is usually the assembly surface of the planetary wheel bearing.

[0023] Specifically, when the lubrication system is working, the lubricating oil enters through the oil passage 2 on the intermediate shaft 1, enters the first oil storage chamber between the intermediate shaft 1 and the first annular groove 5 of the oil distribution sleeve 4 through the first oil hole 3 on the intermediate shaft 1, and then enters the second oil storage chamber between the oil distribution sleeve 4 and the second annular groove 17 of the second supporting plate 9 of the planetary carrier 7 through the second oil hole 6 connected to the first oil storage chamber. During the rotation of the planetary carrier 7, under the action of centrifugal force, the lubricating oil in the second oil storage chamber enters through the third oil hole 18 on the second supporting plate 9 of the planetary carrier 7, passes through the internal oil circuit of the first planetary pin shaft 19 and the internal oil circuit of the second planetary pin shaft 20, and finally reaches the area to be lubricated of the inner ring of the planetary gear bearing (the mounting surface of the inner ring of the planetary gear bearing). Through the above working method, this embodiment only needs to use the third oil hole 18 connected to the oil passage 2 of the intermediate shaft as the only oil inlet, so that the inner rings of the planetary gear bearings of the first planetary gear 29 and the second planetary gear 30 can be lubricated at the same time under the action of the rotating centrifugal force. The oil channel structure is simple, and no additional sealing structure is required. In addition, only one oil inlet is required, thereby saving processing and assembly costs.

[0024] In actual operation, there is a gap between the outer diameter side wall of the oil distribution sleeve 4 and the inner diameter side wall of the second support plate 9. The rotation speed of the planetary transmission system is relatively high, and the lubricating fluid maintains a radially outward trend under the action of the rotating centrifugal force, so that most of the lubricating oil can be stably maintained in the second annular groove 17, which is beneficial to the subsequent lubrication operation. Therefore, although the gap between the outer diameter side wall of the oil distribution sleeve 4 and the inner diameter side wall of the second support plate 9 will cause some leakage, it will not cause too much impact on the lubrication operation when the centrifugal force is sufficient, and the lubrication operation can be carried out stably.

[0025] This embodiment adopts this method to lubricate all the planetary gear bearings of the entire planetary carrier 7 through only one oil inlet of the third oil hole 18. The oil channel structure is simple and the lubrication effect is significant. In addition, there is no need to set up additional sealing rings and sealing ring structures in the lubrication system of the conventional multi-linked planetary gear structure. The planetary carrier 7 has fewer processing surfaces and lower processing requirements, which reduces processing costs and saves sealing costs.

[0026] Furthermore, in a specific embodiment, the internal oil circuit of the first planetary pin shaft 19 includes a first oil inlet hole 21 connected to the third oil hole 18, and the first oil inlet hole 21 is connected to the lubrication area of ​​the inner ring of the first planetary bearing 26 through a first oil outlet hole 23 in the first planetary pin shaft 19; the first planetary bearing 26 is used to install the first planetary gear 29.

[0027] The structure of a multi-connected planetary gearbox is generally arranged with different axes. In this embodiment, the axes of the first planetary pin 19 and the second planetary pin 20 are staggered. The first oil inlet hole 21 is connected to the second oil inlet hole 22 of the internal oil circuit of the second planetary pin 20 through the connecting oil circuit in the second supporting plate 9. The second oil inlet hole 22 is connected to the lubrication area of ​​the inner ring of the second planetary bearing 27 through the second oil outlet hole 24 in the second planetary pin 20. The second planetary bearing 27 is used to install the second planetary gear 30.

[0028] In this embodiment, the above structure can lubricate the first planetary bearing 26 and the second planetary bearing 27 through the same oil inlet. The first oil inlet hole 21 and the second oil inlet hole 22 are respectively arranged along the axial extension of the first planetary pin shaft 19 and the second planetary pin shaft 20, and can also temporarily store lubricating oil locally during the rotation process; the first oil outlet hole 23 and the second oil outlet hole 24 are respectively arranged along the radial extension of the first planetary pin shaft 19 and the second planetary pin shaft 20, so that the lubricating oil temporarily stored in the first oil inlet hole 21 and the second oil inlet hole 22 can be driven to flow out radially under the action of centrifugal force, thereby lubricating the first planetary bearing 26 and the second planetary bearing 27.

[0029] In addition, the multi-linked planetary gear structure in this embodiment has a wide range of applications and strong expansibility. The above scheme only installs one row of planetary gears on the first planetary pin 19 and the second planetary pin 20, which is a double-linked planetary gear. Correspondingly, two rows of planetary gears are installed side by side on the first planetary pin 19 or the second planetary pin 20, and a fourth support plate 11 can be added to the planet carrier 7 between the planetary gears, which can be expanded to a triple-linked planetary gear. Similarly, installing more rows of planetary gears can be expanded to a multi-linked planetary gear. In a specific embodiment, the multi-linked planetary gear structure in this embodiment also includes: a third planetary gear 31, which is installed on the second planetary pin 20 through a third planetary bearing 28; the second oil inlet 22 is connected to the lubrication area of ​​the inner ring of the third planetary bearing 28 through the third oil outlet 25 in the second planetary pin 20. The planet carrier 7 includes a fourth support plate 11, which is arranged between the third planetary gear 31 and the second planetary gear 30.

[0030] The first support plate 8 and the second support plate 9 are connected by a first column 12, the second support plate 9 and the fourth support plate 11 are connected by a third column 14; the fourth support plate 11 and the third support plate 10 are connected by a second column 13. The third planetary gear 31 is only an example of the number of rows that can be expanded in the multi-link planetary gear structure in this embodiment, and the lubrication system in this embodiment can be applied to other numbers of multi-link planetary gears under this arrangement.

[0031] In a specific embodiment, the multi-connected planetary gear structure in this embodiment also includes a first elastic pin and a second elastic pin; the first elastic pin passes through the second supporting plate 9 and is radially inserted into the first planetary pin shaft 19; the second elastic pin passes through the fourth supporting plate 11 and is radially inserted into the second planetary pin shaft 20.

[0032] The structures of the first elastic pin and the second elastic pin refer to GB / T879.1, and are used to limit the axial movement and radial rotation of the first planetary pin 19 and the second planetary pin 20 respectively, so as to ensure the stable operation of the first planetary pin 19 and the second planetary pin 20.

[0033] In a specific embodiment, the first planetary gear 29, the second planetary gear 30 and the third planetary gear 31 are straight teeth, and the gear types existing in the prior art such as herringbone gears or single helical gears can also be selected, which is not specifically limited in this embodiment. Example

[0034] This embodiment provides a gearbox, which includes the multi-connected planetary gear structure described in Embodiment 1.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0036] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A multi-linked planetary gear structure with a lubrication system, characterized in that: include: Intermediate shaft (1); A planet carrier (7) is rotatably mounted on the intermediate shaft (1), the planet carrier (7) comprising a first support plate (8), a second support plate (9) and a third support plate (10); a first planet pin (19) and a second planet pin (20) are respectively mounted on the first support plate (8) and the third support plate (10); a first planetary gear (29) and a second planetary gear (30) with the same phase are respectively mounted on the first planetary pin (19) and the second planetary pin (20) via planetary gear bearings; An oil distribution sleeve (4) is sleeved on the intermediate shaft (1) and is located between the intermediate shaft (1) and the second support plate (9), a first annular groove (5) is formed on the inner wall of the oil distribution sleeve (4), and a second annular groove (17) is formed on the outer wall of the second support plate (9); An oil passage (2) capable of communicating with the outside is formed inside the intermediate shaft (1); the oil passage (2) is connected to the first annular groove (5) and the first oil storage chamber between the intermediate shaft (1) through a first oil hole (3) in the intermediate shaft (1); the first oil storage chamber is connected to the second annular groove (17) and the second oil storage chamber between the oil distribution sleeve (4) through a second oil hole (6) in the oil distribution sleeve (4); the second oil storage chamber is capable of communicating with the internal oil passage of the first planetary pin shaft (19) and the internal oil passage of the second planetary pin shaft (20) through a third oil hole (18) in the second supporting plate (9); the internal oil passage of the first planetary pin shaft (19) and the internal oil passage of the second planetary pin shaft (20) are respectively connected to the inner ring to-be-lubricated area of ​​the planetary wheel bearing for mounting the first planetary wheel (29) and the second planetary wheel (30).

2. The multi-linked planetary gear structure according to claim 1, characterized in that: The internal oil circuit of the first planetary pin shaft (19) comprises a first oil inlet hole (21) connected to the third oil hole (18); the first oil inlet hole (21) is connected to the lubricated area of ​​the inner ring of the first planetary bearing (26) through a first oil outlet hole (23) in the first planetary pin shaft (19); the first planetary bearing (26) is used to mount the first planetary gear (29).

3. The multi-linked planetary gear structure according to claim 2, characterized in that: The first oil inlet hole (21) is connected to a second oil inlet hole (22) of an internal oil circuit of the second planetary pin shaft (20) through a connecting oil circuit in the second support plate (9); the second oil inlet hole (22) is connected to a lubricated area of ​​an inner ring of a second planetary bearing (27) through a second oil outlet hole (24) in the second planetary pin shaft (20); the second planetary bearing (27) is used for mounting the second planetary gear (30).

4. The multi-linked planetary gear structure according to claim 3, characterized in that: Also includes: The third planetary gear (31) is mounted on the second planetary pin (20) via a third planetary bearing (28); the second oil inlet hole (22) is connected to the lubricated area of ​​the inner ring of the third planetary bearing (28) via a third oil outlet hole (25) in the second planetary pin (20).

5. The multi-linked planetary gear structure according to claim 4, characterized in that: The planet carrier (7) comprises a fourth support plate (11), and the fourth support plate (11) is arranged between the third planet gear (31) and the second planet gear (30).

6. The multi-linked planetary gear structure according to claim 5, characterized in that: Also includes: A first elastic pin, passing through the second support plate (9) and inserted radially onto the first planetary pin shaft (19); The second elastic pin passes through the fourth support plate (11) and is radially inserted onto the second planetary pin shaft (20).

7. The multi-linked planetary gear structure according to claim 5, characterized in that: Adjacent two of the first support plate (8), the second support plate (9), the third support plate (10) and the fourth support plate (11) are fixedly connected via columns.

8. The multi-linked planetary gear structure according to claim 1, characterized in that: The first planetary pin shaft (19) is installed in a first pin shaft hole (15) on the first support plate (8); and the second planetary pin shaft (20) is installed in a second pin shaft hole (16) on the second support plate (9).

9. The multi-linked planetary gear structure according to claim 1, characterized in that: The first oil hole (3), the second oil hole (6) and the third oil hole (18) are all arranged radially along the intermediate shaft (1).

10. A gearbox, characterized in that: It comprises the multi-planetary gear structure as described in any one of claims 1-9.

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