Planetary gear train lubricating structure
By designing the oil inlet ring and lubrication circuit structure, the problem of poor lubrication of the planetary gear train was solved, achieving all-round lubrication of the planetary gear train, avoiding equipment damage caused by planetary carrier deformation and poor lubrication, and improving the reliability of equipment operation.
Patent Information
- Application Number
- CN202520394792.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-07
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2035-03-07
AI Technical Summary
In traditional planetary gear train lubrication structures, the spray pipes inserted into the planet carriers cause deformation of the planet carriers, making precise lubrication impossible. Furthermore, poor lubrication spraying can damage gears or bearings, affecting equipment operation.
A planetary gear train lubrication structure is designed, including an oil inlet ring, a first oil passage, a second lubrication passage, and a third lubrication passage. A sealing structure is formed by annular protrusions and grooves to ensure that lubricating oil is accurately sprayed onto the sun gear, planet gears, and internal gear ring, reducing the axial insertion fit size and achieving all-round lubrication.
It effectively prevents planetary carrier deformation, ensures lubricating oil reaches the injection point, achieves all-round lubrication of sun gear, planetary gear, internal gear ring and bearing, improves sealing effect and avoids equipment downtime.
Smart Images
Figure CN223768074U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of mechanical transmission lubrication technology, and in particular to a planetary gear system lubrication structure. Background Technology
[0002] Planetary gear transmission is an important technology in gear transmission. A planetary gearbox, containing planetary gear pairs, is suitable for low-speed, heavy-load applications. Its small size and light weight have made it widely accepted in the market. However, planetary gearboxes have a compact structure and many heavy components. Damage to these components can lead to difficult disassembly and long replacement cycles, resulting in significant losses for customers. Furthermore, the lubrication of the gearbox plays a crucial role in its normal operation. Poor lubrication can cause damage to gears or bearings, leading to equipment downtime and impacting user profits.
[0003] Currently, the traditional planetary gear train lubrication structure, as disclosed in patent CN 118532471 A, involves an oil-receiving spray ring and a planetary gear lubrication system. This system mainly includes a hollow oil-receiving ring with several spray pipes and radial oil holes, directly inserted into the planetary carrier to lubricate the planetary gears with the lubricating oil collected by the ring. However, this lubrication structure suffers from a large axial dimension due to the spray pipes being inserted into the planetary carrier. This results in significant loads on the planetary gear train during operation, making the planetary carrier prone to deformation, which in turn causes the spray pipes to deform, hindering precise lubricating oil spraying. Utility Model Content
[0004] To address the problems existing in the prior art, this utility model provides a planetary gear train lubrication structure.
[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is: a planetary gear train lubrication structure, including a planetary gear train, a front housing and a connecting plate. The planetary gear train includes a planet carrier, a sun gear, planet gears and an internal gear ring, and also includes an oil inlet ring located between the planet carrier and the connecting plate. The oil inlet ring is provided with a first lubricating oil passage. The connecting plate has an oil inlet hole communicating with the first lubricating oil passage. The oil inlet ring is provided with a first annular protrusion on the side facing the planet carrier. The planet carrier is provided with a first annular groove that rotatably engages with the first annular protrusion.
[0006] The planetary carrier is provided with a first oil injection hole facing the outer side of the sun gear and a second oil injection hole facing the inner side of the internal gear ring. The planetary carrier is also provided with a first oil passage and a second lubrication oil passage. The first oil injection hole and the second oil injection hole are connected through the first oil passage, and the first oil passage is connected to the first lubrication oil passage through the second lubrication oil passage.
[0007] As a preferred embodiment, one end of the planetary carrier is rotatably connected to the front housing via a first bearing, and the other end is rotatably connected to the connecting disc via a second bearing.
[0008] As a preferred embodiment, the second lubrication circuit includes a second oil passage, a third oil passage, and a fourth oil passage. The planetary carrier has an oil inlet ring groove that communicates with the first lubrication circuit at one end facing the oil inlet ring. The first oil passage, the second oil passage, the third oil passage, the fourth oil passage, and the oil inlet ring groove are connected in sequence.
[0009] As a preferred embodiment, the first lubrication circuit includes a lubrication ring groove disposed on the surface of the oil inlet ring, and the inside of the oil inlet ring is provided with a lubrication hole for connecting the lubrication ring groove and the oil inlet ring groove.
[0010] As a preferred embodiment, the lubricating oil hole includes a vertical channel communicating with the lubricating oil ring groove and a horizontal channel communicating with the oil inlet ring groove.
[0011] As a preferred embodiment, the oil inlet ring is provided with a third oil injection hole facing the second bearing, and the third oil injection hole is connected to the vertical channel of the lubricating oil hole.
[0012] As a preferred embodiment, the planetary carrier is provided with multiple planetary gear shafts. The planetary gears are rotatably connected to the planetary gear shafts through two planetary gear bearings. A bushing is fitted on the planetary gear shaft between the two planetary gear bearings. A fourth oil injection hole is provided on the outside of the bushing. A third lubrication oil passage is provided on the planetary gear shaft. A fifth oil passage is provided on the planetary carrier and communicates with the oil inlet ring groove. The fourth oil injection hole is connected to the fifth oil passage through the third lubrication oil passage.
[0013] As a preferred embodiment, the third lubrication circuit includes a first vertical oil hole, a horizontal oil hole, and a second vertical oil hole. The inner side of the bushing is provided with a first oil inlet ring groove that communicates with the fourth oil injection hole. The surface of the planetary gear shaft is provided with a second oil inlet ring groove that communicates with the fifth oil passage. The first oil inlet ring groove, the first vertical oil hole, the horizontal oil hole, the second vertical oil hole, and the second oil inlet ring groove are connected in sequence.
[0014] As a preferred embodiment, the oil inlet ring has a second annular groove on the side facing the planetary carrier, and the planetary carrier has a second annular protrusion that rotates and engages with the second annular groove.
[0015] As a preferred embodiment, the oil inlet ring is provided with a stepped ring groove, and the planetary carrier is provided with a step that rotates in conjunction with the stepped ring groove.
[0016] The beneficial effects of this application are as follows: 1. By using the oil inlet ring in conjunction with the first oil passage and the second lubrication oil passage, this application can realize the spraying of lubricating oil from the first oil injection hole and the second oil injection hole, thereby achieving lubrication of the sun gear, planet gears and internal gear ring, greatly reducing the axial embedding fit size, and effectively avoiding deformation of the planet carrier caused by large loads during the operation of the planet gear train.
[0017] 2. This application ensures that the lubricating oil reaches the injection point by interconnecting and cooperating the oil inlet ring, the first oil passage, the second lubricating oil passage, the fifth oil passage and the third lubricating oil passage, thereby achieving lubrication of the sun gear, planet gear, internal gear ring and planet gear bearings.
[0018] 3. The first annular protrusion and the first annular groove of this application cooperate to form a first sealing structure, and the second annular protrusion and the second annular groove cooperate to form a second sealing structure. The double sealing structure effectively increases the sealing effect and ensures the pressure of the lubricating oil circuit. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the structure of this utility model;
[0020] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;
[0021] Figure 3 This is a schematic diagram of the oil inlet ring of this utility model;
[0022] Figure 4 This is a schematic diagram of the structure of the lubricating oil hole of this utility model;
[0023] Figure 5 This is a schematic diagram of the structure of the planetary gear shaft of this utility model;
[0024] Figure 6 This is a schematic diagram of the structure of the bushing of this utility model.
[0025] Markings in the diagram: 1. Planetary carrier; 101. First oil passage; 102. Second oil passage; 103. Third oil passage; 104. Fifth oil passage; 105. First annular groove; 106. Step; 107. Left spoke; 108. Connecting rib; 109. Right spoke; 110. Fourth oil passage; 111. Oil inlet ring groove; 112. Second annular protrusion; 2. Front housing; 3. Oil inlet ring; 31. Lubricating oil ring groove; 32. Lubricating oil hole; 321. Vertical channel; 322. Horizontal channel. 33. First annular protrusion; 34. Second annular groove; 35. Stepped annular groove; 36. Third oil injection hole; 4. Connecting disc; 5. Internal gear ring; 6. Planetary gear; 7. Sun gear; 8. First bearing; 9. Planetary gear bearing; 10. Second bearing; 11. Planetary gear shaft; 1101. First vertical oil hole; 1102. Horizontal oil hole; 1103. Second vertical oil hole; 1104. Second oil inlet ring groove; 12. Bushing; 121. Fourth oil injection hole; 122. First oil inlet ring groove. Detailed Implementation
[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0027] Please see Figure 1-6 This utility model provides a planetary gear train lubrication structure, including a planetary gear train, a front housing 2, and a connecting disc 4. The planetary gear train includes a planet carrier 1, a sun gear 7, planet gears 6, and an internal gear ring 5. The planet carrier 1 is rotatably disposed between the front housing 2 and the connecting disc 4. It also includes an oil inlet ring 3 located between the planet carrier 1 and the connecting disc 4, with a first lubrication oil passage on the oil inlet ring 3. The connecting disc 4 has an oil inlet hole 41 communicating with the first lubrication oil passage. A first annular protrusion 33 is provided on the side of the oil inlet ring 3 facing the planet carrier 1. The planet carrier 1 has... The first annular groove 105 is rotatably engaged with the first annular protrusion 33; the planet carrier 1 is provided with a first oil injection hole facing the outer side of the sun gear 7 and a second oil injection hole facing the inner side of the internal gear ring 5. The first oil injection hole faces the outer teeth of the sun gear 7 and the second oil injection hole faces the inner teeth of the internal gear ring 5. The planet carrier 1 is also provided with a first oil passage 101 and a second lubricating oil passage. The first oil injection hole and the second oil injection hole are connected through the first oil passage 101. The first oil passage 101 is provided on the planet carrier 1 and is connected to the first lubricating oil passage through the second lubricating oil passage.
[0028] The front housing 2 and the connecting plate 4 are connected by bolts. There are multiple, identical first and second fuel injection holes, and the number of first fuel injection holes is the same as the number of first fuel passages 101. Figure 1 and Figure 2 As shown, the second lubrication circuit includes a second oil passage 102, a third oil passage 103 and a fourth oil passage 110. The planetary carrier 1 has an oil inlet ring groove 111 that communicates with the first lubrication circuit at one end facing the oil inlet ring 3. The first oil passage 101, the second oil passage 102, the third oil passage 103, the fourth oil passage 110 and the oil inlet ring groove 111 are connected in sequence.
[0029] Combination Figure 3 and Figure 4As shown, the first lubrication path includes a lubrication ring groove 31 disposed on the surface of the oil inlet ring 3. The oil inlet ring 3 has a lubrication hole 32 inside for connecting the lubrication ring groove 31 and the oil inlet ring groove 111. There are multiple lubrication holes 32, each including a vertical channel 321 communicating with the lubrication ring groove 31 and a horizontal channel 322 communicating with the oil inlet ring groove 111. The horizontal channel 322 is positioned relative to the oil inlet ring groove 111 to ensure that the lubrication oil flows along the correct path. The connection relationship between the planet carrier 1, the sun gear 7, the planet gears 6, and the internal gear ring 5 is prior art well known to those skilled in the art, and will not be described in detail here.
[0030] Combination Figure 1 and Figure 4 As shown, one end of the planetary carrier 1 is rotatably connected to the front housing 2 via a first bearing 8, and the other end is rotatably connected to the connecting plate 4 via a second bearing 10. The oil inlet ring 3 has a third oil injection hole 36 facing the second bearing 10, and the third oil injection hole 36 communicates with the vertical channel 321 of the lubricating oil hole 32. By providing the third oil injection hole 36, lubrication of the second bearing 10 can be achieved. The connecting plate 4 has a positioning mounting hole for installing the second bearing 10, and the oil inlet ring 3 is installed in the positioning mounting hole with an interference fit. The oil inlet ring 3 is located between the second bearing 10 and the connecting plate 4. During operation, the planetary carrier 1 rotates, while the oil inlet ring 3 remains stationary.
[0031] Combination Figure 1 , Figure 5 and Figure 6 As shown, a planetary carrier 1 is provided with multiple planetary gear shafts 11. Planetary gears 6 are rotatably connected to the planetary gear shafts 11 via two planetary gear bearings 9. A bushing 12 located between the two planetary gear bearings 9 is fitted onto the planetary gear shaft 11. A fourth oil injection hole 121 is provided on the outer side of the bushing 12. There is at least one fourth oil injection hole 121. A third lubrication oil passage is provided on the planetary gear shaft 11. A fifth oil passage 104 communicating with the oil inlet ring groove 111 is provided on the planetary carrier 1. The fourth oil injection hole 121 is connected to the fifth oil passage 104 via the third lubrication oil passage. It should be noted that the parts not described in detail in this application are all prior art.
[0032] Specifically, the third lubrication circuit includes a first vertical oil hole 1101, a horizontal oil hole 1102, and a second vertical oil hole 1103. The inner side of the bushing 12 is provided with a first oil inlet ring groove 122 that communicates with the fourth oil injection hole 121. The surface of the planetary gear shaft 11 is provided with a second oil inlet ring groove 1104 that communicates with the fifth oil passage 104. The first oil inlet ring groove 122, the first vertical oil hole 1101, the horizontal oil hole 1102, the second vertical oil hole 1103, and the second oil inlet ring groove 1104 are connected in sequence.
[0033] like Figure 1As shown, planetary gear shafts 11 are equidistantly distributed along the planet carrier 1. The planetary gear shafts 11 are arranged parallel to the sun gear 7, and each planetary gear shaft 11 is equipped with a planetary gear 6 via a planetary gear bearing 9. Multiple planetary gears 6 mesh with the internal gear ring 5 and the sun gear 7. The planet carrier 1 includes a left spoke 107, a right spoke 109, and a connecting rib 108. The connecting rib 108 is located between the left spoke 107 and the right spoke 109. The left spoke 107, the right spoke 109, and the connecting rib 108 are integrally formed. The number of connecting ribs 1-8 is the same as the number of planetary gears 6. The first oil passage 101 and the second oil passage 102 are provided on the connecting ribs 1-8, and the third oil passage 103, the fourth oil passage 110, the oil inlet ring groove 111, and the fifth oil passage 104 are provided on the right spoke 109.
[0034] In addition, combined Figure 2 As shown, the oil inlet ring 3 has a second annular groove 34 on the side facing the planetary carrier 1, and the planetary carrier 1 has a second annular protrusion 112 that rotatably engages with the second annular groove 34. The oil inlet ring 3 has a stepped annular groove 35, and the planetary carrier 1 has a step 106 that rotatably engages with the stepped annular groove 35. A horizontal channel 322 is located at the bottom of the second annular groove 34, and the oil inlet groove 111 is located on the second annular protrusion 112. The second annular groove 34 is located between the first annular protrusion 33 and the stepped annular groove 35. In this application, the first annular protrusion 33 and the first annular groove 105 cooperate to form a first sealing structure, and the second annular protrusion 112 and the second annular groove 34 cooperate to form a second sealing structure. This double sealing structure effectively increases the sealing effect and ensures the pressure of the lubricating oil circuit. The step 106 and the stepped annular groove 35 are configured to cooperate to further improve the sealing effect. The first annular protrusion 33 and the first annular groove 105 are in clearance fit, and the second annular groove 34 and the second annular protrusion 112 are also in clearance fit.
[0035] When this application is used, the oil inlet 41 is connected to the oil supply pipeline of the lubrication station. The lubricating oil in the lubrication station flows through the oil inlet 41, passes through the oil inlet ring 3, enters the oil inlet ring groove 111 of the planetary carrier 1, and then passes through the third oil passage 103, the second oil passage 102 and the first oil passage 101 to reach the first oil injection hole and the second oil injection hole. It then passes through the fifth oil passage 104 and the third lubrication oil passage to reach the fourth oil injection hole 121, thereby realizing the lubrication of the sun gear 7, planet gear 6, internal gear ring 5 and planet gear bearing 9.
[0036] It should be noted that the above embodiments are only used to illustrate the present utility model, but the present utility model is not limited to the above embodiments. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.
Claims
1. A planetary gear train lubrication structure comprising a planetary gear train, a front case (2) and a connecting disk (4), the planetary gear train comprising a carrier (1), a sun gear (7), a planetary gear (6) and an inner ring gear (5), characterized in that, The oil inlet ring (3) is arranged between the planet carrier (1) and the connecting disc (4), the first lubricating oil path is arranged on the oil inlet ring (3), the oil inlet hole (41) is arranged on the connecting disc (4) and communicates with the first lubricating oil path, the first annular protrusion (33) is arranged on one side of the oil inlet ring (3) and faces the planet carrier (1), and the first annular groove (105) is arranged on the planet carrier (1) and rotationally matches the first annular protrusion (33); The first oil hole and the second oil hole are arranged on the planet carrier (1) and face the outer side of the sun gear (7) and the inner side of the inner ring gear (5) respectively, the first oil channel (101) and the second lubricating oil path are arranged on the planet carrier (1), the first oil hole and the second oil hole are communicated through the first oil channel (101), and the first oil channel (101) is communicated with the first lubricating oil path through the second lubricating oil path.
2. A planetary gear train lubrication arrangement according to claim 1, characterised in that: One end of the planet carrier (1) is rotationally connected with the front box body (2) through the first bearing (8), and the other end is rotationally connected with the connecting disc (4) through the second bearing (10).
3. A planetary gear train lubrication arrangement according to claim 2, characterised in that: The second lubricating oil path comprises the second oil channel (102), the third oil channel (103) and the fourth oil channel (110), the oil inlet ring groove (111) is arranged on one end of the planet carrier (1) and faces the oil inlet ring (3) and is communicated with the first lubricating oil path, and the first oil channel (101), the second oil channel (102), the third oil channel (103), the fourth oil channel (110) and the oil inlet ring groove (111) are sequentially communicated.
4. A planetary gear train lubrication arrangement according to claim 3, characterised in that: The first lubricating oil path comprises the lubricating oil ring groove (31) arranged on the surface of the oil inlet ring (3), and the lubricating oil hole (32) is arranged in the oil inlet ring (3) and is used for communicating the lubricating oil ring groove (31) and the oil inlet ring groove (111).
5. A planetary gear train lubrication arrangement according to claim 4, characterised in that: The lubricating oil hole (32) comprises the vertical channel (321) communicated with the lubricating oil ring groove (31) and the horizontal channel (322) communicated with the oil inlet ring groove (111).
6. A planetary gear train lubrication arrangement according to claim 5, characterised in that: The third oil hole (36) is arranged on the oil inlet ring (3) and faces the second bearing (10), and the third oil hole (36) is communicated with the vertical channel (321) of the lubricating oil hole (32).
7. A planetary gear train lubrication arrangement according to claim 2, characterised in that: The planet carrier (1) is provided with a plurality of planet wheel shafts (11), the planet wheel (6) is rotationally connected with the planet wheel shaft (11) through two planet wheel bearings (9), the shaft sleeve (12) is arranged on the planet wheel shaft (11) and located between the two planet wheel bearings (9), the fourth oil hole (121) is arranged on the outer side of the shaft sleeve (12), the third lubricating oil path is arranged on the planet wheel shaft (11), the fifth oil channel (104) is arranged on the planet carrier (1) and communicated with the oil inlet ring groove (111), and the fourth oil hole (121) is communicated with the fifth oil channel (104) through the third lubricating oil path.
8. A planetary gear train lubrication arrangement according to claim 2, characterised in that: The third lubricating oil path comprises a first vertical oil hole (1101), a horizontal oil hole (1102) and a second vertical oil hole (1103), the inner side of the shaft sleeve (12) is provided with a first oil inlet ring groove (122) communicated with the fourth oil injection hole (121), the surface of the planetary gear shaft (11) is provided with a second oil inlet ring groove (1104) communicated with the fifth oil channel (104), and the first oil inlet ring groove (122), the first vertical oil hole (1101), the horizontal oil hole (1102), the second vertical oil hole (1103) and the second oil inlet ring groove (1104) are sequentially communicated.
9. A planetary gear train lubrication arrangement according to claim 1, characterised in that: The side of the oil inlet ring (3) facing the planet carrier (1) is provided with a second annular groove (34), and the planet carrier (1) is provided with a second annular protrusion (112) in rotational cooperation with the second annular groove (34).
10. A planetary gear train lubrication arrangement according to claim 1, characterised in that: The oil inlet ring (3) is provided with a stepped ring groove (35), and the planet carrier (1) is provided with a step (106) in rotational cooperation with the stepped ring groove (35).