A centrifugal lubrication oil system for high-speed planetary gearboxes

Abstract

A centrifugal lubrication oil system for a high-speed planetary gearbox includes a main oil inlet on the gearbox housing, an oil pressure line within the output shaft, a first lubrication line within the sun gear, and a second lubrication line within the planetary shaft. A spray pipe, which allows lubricating oil to flow into the first lubrication line, is fixedly connected to the end face of the output shaft near one end of the input shaft. One end of the spray pipe is fixedly connected to the output shaft, and the other end is inserted into the first lubrication line. Multiple spray holes are formed in the wall of the spray pipe, which allow lubricating oil to be sprayed into the first lubrication line. An oil drain channel is formed in the wall of the first lubrication line within the sun gear. One end of the drain channel is connected to the first lubrication line, and the other end is located at the root of the sun gear, allowing lubricating oil to be sprayed onto the meshing surface between the sun gear and the planetary gear. This invention enables adaptive lubrication of the gearbox at different operating speeds, making it more adaptable to complex service conditions where the gearbox speed varies.

Description

Technical Field

[0001] The invention relates to the field of forced lubrication of planetary gearboxes, in particular to a centrifugal lubrication oil circuit system for high-speed planetary gearboxes. Background Art

[0002] High-speed planetary gearboxes typically consist of a sun gear shaft system, planetary gears, an internal gear ring, a planet carrier, bearings, and a housing. Prior art gearbox transmission systems typically utilize nozzle oil injection for lubrication. However, during this process, the nozzles are affected by factors such as gear speed and airflow. This can lead to blind spots in the nozzle spray and prevents the nozzle from spraying evenly and completely onto the meshing surfaces of the planetary and sun gears. This increases wear on the meshing surfaces between the planetary and sun gears, compromising lubrication effectiveness. Furthermore, increased wear on the meshing surfaces of the planetary and sun gears generates significant heat. The prolonged accumulation of heat can cause rust on the tooth surfaces, shortening their service life. Summary of the Invention

[0003] The present invention aims to provide a centrifugal lubrication oil circuit system for a high-speed planetary gearbox, which can not only realize adaptive lubrication of the gearbox at different operating speeds and better adapt to complex service conditions where the gearbox speed changes, but also achieves uniform and effective lubrication, thereby extending the service life of the gearbox.

[0004] In order to solve the above technical problems, the specific solution adopted by the present invention is a centrifugal lubrication oil circuit system for a high-speed planetary gearbox: comprising a main oil inlet provided on the gearbox housing, an oil pressure pipeline provided in the output shaft and distributed along its own axial direction, a first lubrication pipeline provided in the sun gear and distributed along its own axial direction, and a second lubrication pipeline provided in the planetary shaft and distributed along its own axial direction;

[0005] An oil spray pipe for supplying lubricating oil to the first lubricating pipeline is fixedly connected to the end face of the output shaft near one end of the input shaft. One end of the oil spray pipe is fixedly connected to the output shaft, and the other end is inserted into the first lubricating pipeline. A plurality of oil spray holes are formed on the wall of the oil spray pipe for spraying lubricating oil into the first lubricating pipeline. An oil drain channel is formed on the wall of the first lubricating pipeline in the sun gear. One end of the oil drain channel is connected to the first lubricating pipeline, and the other end is located at the root of the sun gear gear, so that the lubricating oil is sprayed onto the meshing surface of the sun gear and the planetary gear.

[0006] A plurality of first radial oil holes are provided in the output shaft at an end of the oil pressure pipeline away from the oil injection pipe, and a first oil through hole is provided on the output shaft thrust bearing between the gear box housing and the output shaft for the lubricating oil in the main oil inlet to flow into the first radial oil hole; a plurality of second radial oil holes are provided at an end of the oil pressure pipeline close to the oil injection pipe, a second oil through hole is provided on the output shaft support bearing between the planetary carrier and the output shaft, a plurality of oil distribution pipes are provided on the planetary carrier, and an oil inlet hole is provided on the planetary shaft, so that the lubricating oil in the oil pressure pipeline flows into the second lubrication pipeline through the second radial oil holes, the second oil through hole, the oil distribution pipe and the oil inlet hole in sequence; an oil outlet channel is provided on the side wall of the second lubrication pipeline in the planetary shaft, and the oil outlet channel is for the lubricating oil to flow out between the planetary shaft and the planetary gear.

[0007] As a further optimization of the centrifugal lubrication oil circuit system of a high-speed planetary gearbox of the present invention: a secondary oil inlet is opened in the gearbox body at one end of the input shaft, and a third oil hole is opened on the input shaft support bearing between the gearbox body and the input shaft.

[0008] As a further optimization of the centrifugal lubrication oil circuit system of a high-speed planetary gearbox of the present invention: an annular docking groove connected to the first oil hole is opened on the inner wall of the output shaft thrust bearing, and the width of the docking groove is greater than the aperture of the first radial oil hole.

[0009] As a further optimization of the centrifugal lubrication oil circuit system of a high-speed planetary gearbox of the present invention: the oil injection pipe is fixed to the output shaft by bolts.

[0010] As a further optimization of the centrifugal lubrication oil circuit system of a high-speed planetary gearbox of the present invention: the gear on the sun gear is a herringbone gear, and the length of the first lubrication pipeline is greater than the width of the sun gear.

[0011] Beneficial effects

[0012] In the present invention, the oil injection pipe is fixed on the output shaft and passed through the first lubrication pipeline. The setting of the oil injection pipe can spray the lubricating oil flowing into the oil pressure pipeline from the main oil inlet into the first lubrication pipeline through the oil injection hole, and evenly flow to the meshing surface of the gear between the sun gear and the planetary gear through the oil discharge channel in the sun gear, thereby avoiding the problem of uneven and incomplete lubricating oil on the meshing surface caused by the lubricating oil sprayed from the nozzle, thereby avoiding the problem of meshing surface wear and rust caused by uneven lubricating oil on the meshing surface between the sun gear and the planetary gear, and improving the service life of the gear box.

[0013] Furthermore, the greater the sun gear speed, the more lubricating oil is required between the sun gear and the planetary gears. Consequently, the greater amount of lubricating oil in the first lubrication duct is sprayed onto the meshing surfaces between the sun gear and the planetary gears under the enormous centrifugal force for lubrication. At lower sun gear speeds, the less lubricating oil is required between the sun gear and the planetary gears. Consequently, the smaller amount of lubricating oil in the first lubrication duct is sprayed onto the meshing surfaces between the sun gear and the planetary gears under the centrifugal force for lubrication. This achieves adaptive lubrication of the gearbox at different operating speeds, making it more adaptable to complex service conditions where the gearbox speed varies.

[0014] The lubricating oil in the present invention enters the first oil hole from the main oil inlet. The lubricating oil in the first oil hole can be used to lubricate the output shaft and the output shaft thrust bearing. The lubricating oil in the first oil hole flows into the oil pressure pipeline through the first radial oil hole. Part of the lubricating oil in the oil pressure pipeline flows into the oil injection pipe. The lubricating oil in the oil injection pipe flows into the first lubrication pipeline through the oil injection hole. The lubricating oil is then discharged from the first lubrication pipeline to the meshing surface of the sun gear and the planetary gear through the oil discharge channel for lubrication. Another part of the lubricating oil flows into the second lubrication pipeline through the second radial oil hole, the second oil hole, the oil distribution pipe, and the oil inlet hole. The lubricating oil in the second lubrication pipeline flows through the oil outlet channel to the space between the planetary shaft and the planetary gear for lubrication. By setting up this series of channels, key parts of the gearbox can be lubricated. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural diagram of the centrifugal lubrication oil circuit system of the high-speed planetary gearbox of the present invention;

[0016] Figure 2 It is a partially enlarged schematic diagram of the oil injection pipe in the centrifugal lubrication oil circuit system of the high-speed planetary gearbox of the present invention;

[0017] Figure 3 Schematic diagram of the distribution of oil drain holes on the sun gear;

[0018] Figure markings: 1. gearbox housing, 2. main oil inlet, 3. output shaft thrust bearing, 31. first oil hole, 32. docking groove, 4. output shaft, 41. first radial oil hole, 42. second radial oil hole, 5. oil pressure pipeline, 6. output shaft support bearing, 61. second oil hole, 7. planetary carrier, 71. oil distribution pipe, 8. inner ring gear, 9. planetary shaft, 91. oil inlet hole, 92. oil outlet channel, 93. second lubrication channel, 10. planetary gear, 11. input shaft, 12. input shaft support bearing, 121. third oil hole, 13. auxiliary oil inlet, 14. sun gear, 15. first lubrication channel, 151. oil drain channel, 16. oil injection pipe, 161. oil injection hole. DETAILED DESCRIPTION

[0019] like Figure 1As shown, a centrifugal lubrication oil circuit system of a high-speed planetary gearbox of the present invention includes a main oil inlet 2 opened on the gearbox housing 1, an oil pressure pipeline 5 opened in the output shaft 4 and distributed along its own axial direction, a first lubrication pipeline 15 opened in the sun gear 14 and distributed along its own axial direction, and a second lubrication pipeline 93 opened in the planetary shaft 9 and distributed along its own axial direction.

[0020] The main oil inlet 2 is located on the right side of the gearbox housing 1. A first oil hole 31 is defined in the output shaft thrust bearing 3, located between the output shaft 4 and the gearbox housing 1. Lubricating oil is pumped into the main oil inlet 2 by an oil pump, from which it flows into the first oil hole 31. An annular docking groove 32 is defined inside the output shaft thrust bearing 3. The width of the docking groove 32 is greater than the diameter of the first oil hole 31. Lubricating oil flows through the first oil hole 31 into the annular docking groove 32, where it lubricates the space between the output shaft 4 and the output shaft thrust bearing 3.

[0021] Four first radial oil holes 41 are evenly spaced apart on the sidewall of the output shaft 4 at the right end of the oil pressure pipe 5. These first radial oil holes 41 connect to the oil pressure pipe 5 toward the right end of the oil pressure pipe 5. The end of the first radial pipe away from the oil pressure pipe 5 is distributed toward the docking groove 32. The diameter of the first radial oil holes 41 is smaller than the width of the docking groove 32, allowing lubricating oil in the docking groove 32 to flow into the first radial oil holes 41, and then into the oil pressure pipe 5 through the first radial oil holes 41.

[0022] like Figure 1 and Figure 2 As shown, an oil spray pipe 16 is fixedly mounted on the left end face of the output shaft 4. The right end of the oil spray pipe 16 is bolted to the output shaft 4, and the left end of the oil spray pipe 16 is inserted into the first lubrication duct 15. A plurality of oil spray holes 161 are evenly spaced around the outer circumference of the oil spray pipe 16, through which the lubricating oil in the oil spray pipe 16 is sprayed into the first lubrication duct 15. The lubricating oil in the oil spray pipe 16 flows into the oil pressure duct 5 and is sprayed into the first lubrication duct 15 under the centrifugal force generated by the rotation of the output shaft 4.

[0023] like Figure 1 and Figure 3As shown, the gears on the sun gear 14 are herringbone gears, and the length of the first lubrication duct 15 is greater than the width of the gears on the sun gear 14. Multiple oil drain holes 151 are evenly spaced on the sidewalls of the first lubrication duct 15 within the sun gear 14. The ends of the oil drain holes 151 facing the oil injection pipe 16 are all connected to the first lubrication duct 15. The end of the oil discharge channel 151 away from the first lubrication pipeline 15 is located at the tooth root of the corresponding sun gear 14, so that when the sun gear 14 rotates, the lubricating oil flows from the first lubrication pipeline 15 into the oil discharge channel 151 and is evenly sprayed onto the gear meshing surface between the sun gear 14 and the planetary gear 10. The lubricating oil is transferred to the meshing surface between the planetary gear 10 and the inner ring gear 8 through the meshing between the planetary gear 10 and the inner ring gear 8 for lubrication, thereby reducing the wear between the gear meshing surfaces of the sun gear 14 and the planetary gear 10, and the planetary gear 10 and the inner ring gear 8, thereby avoiding heat and rust between the gear meshing surfaces of the sun gear 14 and the planetary gear 10, and the planetary gear 10 and the inner ring gear 8, thereby extending the service life of the gearbox.

[0024] The greater the speed of the sun gear 14, the more lubricating oil is sprayed from the oil injection hole 161 into the first lubricating duct 15. The slower the speed of the sun gear 14, the less lubricating oil is sprayed from the oil injection hole 161 into the first lubricating duct 15. In other words, the amount of lubricating oil sprayed can be adjusted by adjusting the speed of the output shaft 4, thereby achieving adaptive lubrication of the gearbox at different operating speeds and better adapting to complex service conditions where the gearbox speed varies.

[0025] like Figure 1 As shown, four second radial oil holes 42 are evenly spaced apart on the sidewall of the oil pressure pipe 5 near the left end of the oil injection pipe 16 within the output shaft 4. A portion of the lubricating oil within the oil pressure pipe 5 flows into the second radial oil holes 42. A second oil hole 61 is formed in the output shaft support bearing 6 between the planetary carrier 7 and the output shaft 4. As the output shaft 4 rotates, the lubricating oil flows from the second radial oil holes 42 into the second oil hole 61. The planetary carrier 7 is provided with multiple oil distribution pipes 71 connected to the second oil hole 61. The lubricating oil within the second oil hole 61 flows into the oil distribution pipes 71. An oil inlet hole 91 is formed in the sidewall of the planetary shaft 9 at one end of the second lubrication pipe 93. The lubricating oil within the oil distribution pipe 71 flows into the second lubrication pipe 93 through the oil inlet hole 91.

[0026] An oil outlet channel 92 is defined within the sidewall of the planetary shaft 9, located in the middle of the second lubrication channel 93. The planetary shaft 9 is provided with an annular groove, the width of which is greater than the diameter of the oil outlet channel 92. The planetary gear 10 is provided with a trapezoidal groove that, together with the groove, forms a lubrication cavity. The lubricating oil within the hydraulic pipeline 5 flows sequentially through the second radial oil hole 42, the second oil hole 61, the oil distribution pipe 71, and the oil inlet hole 91 into the second lubrication channel 93. The lubricating oil within the second lubrication channel 93 then flows through the oil outlet channel 92 into the lubrication cavity between the planetary gear 10 and the planetary shaft 9, thereby lubricating the area between the planetary gear 10 and the planetary shaft 9.

[0027] An auxiliary oil inlet 13 is provided on the left side of the gearbox housing 1 at one end of the input shaft 11. An input shaft support bearing 12 is provided between the input shaft 11 and the gearbox housing 1. A third oil hole 121 is provided on the input shaft support bearing 12. The lubricating oil flowing in from the auxiliary oil inlet 13 enters between the input shaft support bearing 12 and the input shaft 11 through the third oil hole 121 to lubricate the rotation between the input shaft 11 and the input shaft support bearing 12.

[0028] The specific embodiment of the present invention is as follows: When the gearbox is started, lubricating oil enters the main oil inlet 2 through the oil pump. The lubricating oil in the main oil inlet 2 flows into the docking groove 32 through the first oil hole 31. As the output shaft 4 rotates, the lubricating oil in the docking groove 32 flows into the first radial oil hole 41. The lubricating oil flows into the oil pressure pipe 5 through the first radial oil hole 41. A portion of the lubricating oil in the oil pressure pipe 5 flows into the oil injection pipe 16, which rotates at high speed with the output shaft 4. The lubricating oil in the oil injection pipe 16 is sprayed into the first lubrication pipe 15 through the oil injection hole 161 under the action of centrifugal force. The lubricating oil in the first lubrication pipe 15 is then sprayed through the oil discharge channel 151 to the gear meshing surface between the sun gear 14 and the planetary gears 10 under the centrifugal force generated by the rotation of the sun gear 14, thereby lubricating the gear meshing surface. Another part of the lubricating oil in the oil pressure pipe 5 flows into the second radial oil hole 42. The lubricating oil in the second radial oil hole 42 then flows into the second lubrication pipe 93 through the second oil hole 61, the oil distribution pipe 71 and the oil inlet hole 91 in sequence. The lubricating oil in the second lubrication pipe 93 flows through the oil outlet channel 92 to the lubrication cavity between the planetary gear 10 and the planetary shaft 9 to achieve lubrication.

Claims

1. A centrifugal lubrication oil system for a high-speed planetary gearbox, characterized by: It comprises a main oil inlet (2) provided on a gearbox housing (1), an oil pressure pipe (5) provided in an output shaft (4) and distributed along its own axial direction, a first lubrication pipe (15) provided in a sun gear (14) and distributed along its own axial direction, and a second lubrication pipe (93) provided in a planetary shaft (9) and distributed along its own axial direction; An oil spray pipe (16) for supplying lubricating oil to the first lubricating pipe (15) is fixedly connected to the end face of the output shaft (4) near one end of the input shaft (11), and one end of the oil spray pipe (16) is fixedly connected to the output shaft (4), and the other end is inserted into the first lubricating pipe (15); a plurality of oil spray holes (161) for supplying lubricating oil to the first lubricating pipe (15) are opened on the wall of the oil spray pipe (16); an oil drain channel (151) is opened on the wall of the first lubricating pipe (15) in the sun gear (14), one end of the oil drain channel (151) is communicated with the first lubricating pipe (15), and the other end is located at the root of the sun gear (14) gear, so that the lubricating oil is sprayed onto the meshing surface of the sun gear (14) and the planetary gear (10); A plurality of first radial oil holes (41) are provided in the output shaft (4) at one end of the oil pressure pipe (5) away from the oil injection pipe (16); a first oil hole (31) is provided on the output shaft thrust bearing (3) between the gear box housing (1) and the output shaft (4) for the lubricating oil in the main oil inlet (2) to flow into the first radial oil hole (41); a plurality of second radial oil holes (42) are provided at one end of the oil pressure pipe (5) close to the oil injection pipe (16); a second oil hole (31) is provided on the output shaft support bearing (6) between the planetary carrier (7) and the output shaft (4) The planetary carrier (7) is provided with a plurality of oil distribution pipes (71), and the planetary shaft (9) is provided with an oil inlet hole (91), so that the lubricating oil in the oil pressure pipe (5) flows into the second lubricating pipe (93) through the second radial oil hole (42), the second oil hole (61), the oil distribution pipe (71) and the oil inlet hole (91) in sequence; an oil outlet channel (92) is provided on the side wall of the second lubricating pipe (93) in the planetary shaft (9), and the oil outlet channel (92) allows the lubricating oil to flow out between the planetary shaft (9) and the planetary gear (10); An annular docking groove (32) communicating with the first oil hole (31) is provided on the inner wall of the output shaft thrust bearing (3), and the width of the docking groove (32) is greater than the diameter of the first radial oil hole (41); The fuel injection pipe (16) is fixed to the output shaft (4) by bolts.

2. A high-speed planetary gearbox centrifugal lubrication oil system according to claim 1, characterized in that: A secondary oil inlet (13) is provided at one end of the input shaft (11) in the gearbox housing (1), and a third oil hole (121) is provided on the input shaft support bearing (12) between the gearbox housing (1) and the input shaft (11).

3. The centrifugal lubrication oil system for a high-speed planetary gearbox according to claim 1, characterized in that: The gears on the sun gear (14) are herringbone gears, and the length of the first lubrication channel (15) is greater than the width of the gears on the sun gear (14).

Images