A lubrication system for a planetary gear transmission mechanism

Abstract

The present invention discloses a lubrication system for a planetary gear transmission mechanism, which includes a planetary gear transmission mechanism composed of a sun gear, planetary gears and an internal gear ring. To achieve effective lubrication of the internal bearings and meshing gear pairs; in the present invention, an oil injection pipe is fixedly arranged on one side end cover, and an oil storage tray is fixed on the end face of the planet carrier close to the oil injection pipe, so as to form an oil storage cavity between the oil storage tray and the end face of the planet carrier, and an oil inlet groove is opened on the oil storage tray; an axial bearing lubricating oil passage communicating with the inner cavity of the bearing is opened on the planetary gear shaft, and a planetary gear lubricating oil pipe is fixedly arranged on the inner side of the column connecting the upper and lower parts of the planet carrier between two adjacent planetary gears, and a lubricating oil hole facing the planetary gear is opened on the planetary gear lubricating oil pipe. The overall lubrication system of the present invention has a simple structure and remarkable lubrication effect. The planetary gears can be herringbone gears or single helical gears, and the number can be three or more. The application range is wide, and the industry problem of forced lubrication of the planetary gear transmission mechanism is well solved.

Description

Technical Field

[0001] The present invention relates to a planetary gear transmission mechanism, and in particular to a lubrication system for a planetary gear transmission mechanism. Background Art

[0002] The planetary gear transmission mechanism can achieve power splitting, and has the characteristics of compact structure, small size, light weight, high load-bearing capacity, etc. In particular, the herringbone gear can further reduce the calculated load per unit tooth width, and has higher load-bearing capacity, larger contact ratio, extremely small axial force, as well as advantages such as smooth transmission and low noise, meeting the strict requirements of small size, high load-bearing, and high power density for gear transmission devices in high-end equipment. Therefore, it is widely used in various gear equipment.

[0003] Although the planetary gear transmission device has outstanding advantages such as compact structure, the general oil-immersion lubrication method is likely to cause the lubricating oil temperature to overheat, resulting in meshing failure and affecting the overall life of the transmission device. For this reason, a forced lubrication method needs to be adopted to directly spray oil on the meshing teeth part and the internal bearings of the planetary gears for sufficient lubrication. However, it is found in actual use that since the planetary gear bearings are entirely enclosed in the upper and lower plates of the planet carrier, and the exposed part is very small, the oil sprayed onto the bearings cannot enter the inside of the bearings, and it is also very difficult to lubricate the gear meshing positions. Therefore, the forced lubrication of the planetary gear transmission mechanism has always been a difficult problem in this industry. Summary of the Invention

[0004] The purpose of the present invention is to provide a lubrication system for a planetary gear transmission mechanism in view of the industry problem of difficult lubrication of the planetary gear transmission mechanism.

[0005] To achieve the above purpose, the present invention can adopt the following technical solutions:

[0006] The lubrication system for a planetary gear transmission mechanism according to the present invention includes a planetary gear transmission mechanism composed of a sun gear, planetary gears mounted on a planet carrier, and an external internal gear ring. The planetary gear shafts are assembled in the inner holes of the planetary gears through bearings. The planetary gears are externally meshed with the sun gear and internally meshed with the internal gear ring at the same time. End covers respectively arranged at both ends of the internal gear ring are fixedly connected to the internal gear ring as a whole through connecting pieces;

[0007] To ensure the effective lubrication of the bearings and the gear tooth meshing part, the present invention opens a through hole on one side end cover, and a spray oil pipe is fixedly arranged inward from the through hole;

[0008] A lubricating oil pan is fixed on the end face of the planet carrier close to the spray oil pipe. An oil storage cavity is formed between the lubricating oil pan and the end face of the planet carrier, and an oil inlet groove is opened on the lubricating oil pan;

[0009] An axial bearing lubricating oil passage communicating with the inner cavity of the bearing is provided on the planetary gear shaft. A planetary gear lubricating oil pipe is fixed to the inner side of the upper and lower connecting columns of the planet carrier between two adjacent planetary gears. Lubricating oil holes facing the planetary gear are provided on the planetary gear lubricating oil pipe.

[0010] Due to the addition of a lubricating oil pan at the end face of the planet carrier, during operation, the oil sprayed by the spray pipe can be stored in the oil storage cavity formed between the lubricating oil pan and the end face of the planet carrier and flow in the oil storage cavity. At the same time, during the rotation of the planet carrier, it flows into the bearing lubricating oil passage and the planetary gear lubricating oil pipe, effectively lubricating the bearings and meshing gear pairs inside the planet carrier.

[0011] To ensure that the oil can be effectively sprayed into the oil storage cavity, spray holes are provided on the spray pipe. The spray holes all face the lubricating oil pan and correspond to the positions of the oil inlet grooves provided on the lubricating oil pan.

[0012] The number of oil inlet grooves provided on the lubricating oil pan is twice the number of planetary gears.

[0013] The lubricating oil pan is of an annular structure. Mounting holes are evenly provided in the fixing part on its inner side. The outer edge part of the lubricating oil pan is folded inwards to form an annular concave cavity structure in the middle. Reinforcing ribs facing the end face of the planet carrier are evenly arranged along the radial direction between two adjacent oil inlet grooves. The reinforcing ribs divide the middle annular concave cavity of the lubricating oil pan into relatively independent areas. The positions of the inlets of the bearing lubricating oil passage and the planetary gear lubricating oil pipe correspond to the lower corners of the corresponding areas, so as to ensure the lubrication effect on the bearings on each planetary gear shaft and each meshing gear pair.

[0014] The oil inlet grooves provided on the lubricating oil pan are arc-shaped long grooves, which are convenient for spraying the oil into the oil storage cavity.

[0015] The advantages of the present invention are as follows:

[0016] Compared with the existing forced lubrication method, in the present invention, a spray pipe is fixed on the end cover, a lubricating oil pan is added at the end face of the planet carrier, and an axial bearing lubricating oil passage communicating with the inner cavity of the bearing is provided on the planetary gear shaft. A planetary gear lubricating oil pipe is fixed to the inner side of the upper and lower connecting columns of the planet carrier between two adjacent planetary gears. During operation, the oil sprayed by the spray pipe enters the oil storage cavity formed between the lubricating oil pan and the end face of the planet carrier and flows in the oil storage cavity. At the same time, during the rotation of the planet carrier, it enters the bearing lubricating oil passage and the planetary gear lubricating oil pipe, effectively lubricating the bearings and meshing gear pairs inside the planet carrier. The overall lubrication system has a simple structure, a remarkable lubrication effect, the planetary gears can be herringbone gears or single helical gears, and the number of planetary gears can be three or more. It has a wide application range and well solves the industry problem of forced lubrication of planetary gear transmission mechanisms. Description of the Drawings

[0017] Figure 1 It is a structural schematic diagram of the present invention.

[0018] Figure 2 is Figure 1 the left view of

[0019] Figure 3 is Figure 1 the structural diagram of the lubricating oil pan in

[0020] Figure 4 is Figure 3 the sectional view taken along the line A-A of Specific embodiments

[0021] The following will make a clearer and more complete description of the present invention with reference to the accompanying drawings for the understanding of those skilled in the art.

[0022] Those skilled in the art should understand that this embodiment is only used to explain the technical principle of the present application and is not used to limit the protection scope of the present application. The technical solutions adjusted according to actual needs will still fall within the protection scope of the present application.

[0023] Such as Figure 1-2 The planetary gear transmission mechanism shown includes a sun gear 1, three planetary gears 3 mounted on a planet carrier 2, and an external internal gear ring (composed of a left internal gear ring 4.1 and a right internal gear ring 4.2 with different helix directions). The planetary gear shaft 5 is assembled in the inner hole of the planetary gear 3 through a bearing 6, and both ends are fitted with the planetary gear shaft holes opened on the planet carrier and fixed by bolts. Left end covers 7.1 and right end covers 7.2 are respectively arranged on the outer sides of the left internal gear ring 4.1 and the right internal gear ring 4.2. The left internal gear ring 4.1, the right internal gear ring 4.2, the left end covers 7.1 and the right end covers 7.2 are fixed together by bolts 8 and positioning pins 9. The three planetary gears 3 are simultaneously externally meshed with the sun gear 1 and internally meshed with the internal gear ring to jointly transmit power. During operation, the power is input from the sun gear 1 and output from the planet carrier 2, and the internal gear ring remains stationary.

[0024] For those skilled in the art, the sun gear 1 and the planetary gears 3 can be herringbone gears or single helical gears; the number of planetary gears 3 can also be greater than three.

[0025] To effectively lubricate the internal bearings 6 and the internal and external meshing gear pairs during the operation of the planetary transmission mechanism, improve the transmission performance of the planetary transmission mechanism, and extend the service life, two through holes (which can be symmetrically opened up and down) are opened on the left end cover 7.1 of the present invention, and two oil spray pipes 10 are fixedly arranged inward from the through holes. External oil can be sprayed into the transmission mechanism through the oil spray pipes 10.

[0026] A lubricating oil pan 11 is fixed on the end face of the planet carrier 2 near the fuel injection pipe 10. An oil storage cavity is formed between the lubricating oil pan 11 and the end face of the planet carrier 2, and an oil inlet groove 12 is provided on the lubricating oil pan 11; the number of the oil inlet grooves 12 is twice that of the planet gears 3. Since there are three planet gears in this application, six oil inlet grooves 12 need to be provided.

[0027] To ensure that the oil sprayed from the fuel injection pipe 10 can effectively enter the oil storage cavity from the oil inlet groove 12, an oil injection hole is provided on the fuel injection pipe 10. The assembly should ensure that the oil injection holes all face the lubricating oil pan 11 and correspond to the positions of the oil inlet grooves 12 provided on the lubricating oil pan 11.

[0028] An axial bearing lubricating oil passage 13 communicating with the inner cavity of the bearing is provided on the planet gear shaft 5. A planet gear lubricating oil pipe 14 is fixed on the inner side of the upper and lower connecting columns of the planet carrier between two adjacent planet gears. Lubricating oil holes are provided on the planet gear lubricating oil pipe 14 (the lubricating oil holes are spaced along the tooth thickness direction of the planet gear, for example, four can be provided to ensure that all parts of the planet gear teeth can be lubricated). Obviously, the assembly should also ensure that the lubricating oil holes face the planet gear 3.

[0029] In this invention, since a lubricating oil pan 11 is added to the end face of the planet carrier, an oil storage cavity is formed between the lubricating oil pan 11 and the end face of the planet carrier. The fuel injection pipe 10 fixed on the left end cover 7.1 sprays the lubricating oil into the oil storage cavity through the oil inlet groove 12 provided on the lubricating oil pan 11 and flows in the oil storage cavity. During the rotation of the planet carrier, the lubricating oil will flow into the bearing lubricating oil passage 13 and the planet gear lubricating oil pipe 14 to effectively lubricate the bearing 6 and the planet gear meshing pair inside the planet carrier.

[0030] To ensure that the lubricating oil can smoothly flow into the bearing lubricating oil passage 13 and the planet gear lubricating oil pipe 14, the structure of the lubricating oil pan 11 designed in this application is as follows:

[0031] As Figure 3 、 Figure 4 shown, the lubricating oil pan 11 of this invention is of an annular structure. Mounting holes 11.1 are evenly provided in the fixed part on its inner side and it is fixed on the end face of the planet carrier through fixing bolts; the outer edge part of the lubricating oil pan is folded inwards to form an annular concave cavity structure in the middle (as Figure 4 ), which is convenient for storing oil; reinforcing ribs 11.2 facing the end face of the planet carrier are evenly arranged along the radial direction between two adjacent oil inlet grooves 12. The reinforcing ribs 11.2 can not only strengthen the strength of the lubricating oil pan 11, but also divide the middle annular concave cavity of the lubricating oil pan 11 into six relatively independent areas. The inlet of each bearing lubricating oil passage 13 and the inlet of the planet gear lubricating oil pipe 14 correspond to the lower corners of the corresponding areas to ensure the smooth inflow of the lubricating oil, so as to ensure the lubrication effect on the bearings on each planet gear shaft and each planet gear meshing gear pair.

[0032] Meanwhile, the oil inlet groove 12 formed on the lubricating oil pan 11 is designed as an arc-shaped long groove, which is more convenient for the oil injection pipe 10 to inject the oil into the oil storage cavity.

Claims

1. A lubrication system for a planetary gear transmission mechanism, comprising a planetary gear transmission mechanism composed of a sun gear, planetary gears mounted on a planet carrier, and an external internal gear ring. The planetary gear shafts are assembled in the inner holes of the planetary gears through bearings. The planetary gears are externally meshed with the sun gear and internally meshed with the internal gear ring at the same time. End covers respectively arranged at both ends of the internal gear ring are fixedly connected to the internal gear ring as a whole through connecting pieces; it is characterized in that: A through hole is opened on one side end cover, and an oil spraying pipe is fixedly arranged inward from the through hole; An oil storage tray is fixed on the end face of the planet carrier close to the oil spraying pipe. An oil storage cavity is formed between the oil storage tray and the end face of the planet carrier, and an oil inlet groove is opened on the oil storage tray; An axial bearing lubricating oil passage communicating with the inner cavity of the bearing is opened on the planetary gear shaft. A planetary gear lubricating oil pipe is fixed on the inner side of the connecting column between the upper and lower parts of the planet carrier between two adjacent planetary gears. Lubricating oil holes facing the planetary gears are opened on the planetary gear lubricating oil pipe; Oil spraying holes are opened on the oil spraying pipe, and the oil spraying holes all face the oil storage tray and correspond to the positions of the oil inlet grooves opened on the oil storage tray; The number of the oil inlet grooves opened on the oil storage tray is twice the number of the planetary gears; The oil storage tray is of an annular structure, and mounting holes are evenly opened in the inner fixing part thereof; the outer edge part of the oil storage tray is folded inwards so that a central annular concave cavity structure is formed. Reinforcing ribs facing the end face of the planet carrier are evenly arranged along the radial direction between two adjacent oil inlet grooves. The reinforcing ribs divide the central annular concave cavity of the oil storage tray into relatively independent areas, and the positions of the inlets of the bearing lubricating oil passage and the planetary gear lubricating oil pipe correspond to the lower corners of the corresponding areas.

2. The lubrication system for a planetary gear transmission mechanism according to claim 1, characterized in that: The oil inlet grooves opened on the oil storage tray are arc-shaped long grooves.

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