Gear box and gear transmission turbofan engine

Abstract

The utility model provides a gear box and a gear transmission turbofan engine. The gear box comprises a sun gear, a plurality of planet gears, an inner gear ring arranged on the outer sides of the planet gears in a sleeving mode and a planet carrier arranged among the sun gear, the planet gears and the inner gear ring, the oil distributing plate is connected with the oil distributing disc, and the oil distributing disc is installed on one side of the planet carrier; the oil distributing plate is arranged between the two adjacent planet gears and the planet carrier, and at least two sets of oil distributing flow channels are formed in the oil distributing plate so that oil can flow to the meshing area between the sun gear and the planet gears. According to the gear box, oil is supplied to the planet carrier, the sun gear and the inner gear ring through the oil distribution disc and the oil distribution plate, independent oil supply of meshing points of the planet gear and the inner gear ring of the gear box driven by a fan is omitted, the overall cooling efficiency of lubricating oil is improved, the oil stirring condition is reduced, the oil mist concentration in the box body is reduced, and the transmission efficiency of the driving gear box is improved; therefore, the fuel efficiency of the aero-engine is improved, and the fuel cost of the aero-engine is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of cooling of geared turbofan engines, and particularly relates to a gearbox and a geared turbofan engine. Background Art

[0002] In the aviation field, a geared turbofan (GTF) engine installs a suitable gear reducer between the low-pressure rotor composed of a low-pressure compressor and a low-pressure turbine and the fan rotor, that is, a corresponding fan drive gearbox.

[0003] The input end of the fan drive gearbox is connected to the low-pressure rotor, the output shaft is connected to the fan, and the fan rotor operates at a low speed while the low-pressure rotor operates at a high speed, thereby reducing the number of compressor stages, reducing weight, and improving efficiency.

[0004] As a component connecting the fan and the low-pressure rotor in a GTF engine, the fan drive gearbox has the characteristics of large power transmission, high transmission efficiency, long service life, etc. Because the fan drive gearbox transmits a large amount of power and inevitably has power loss during operation, and the power loss is basically released as heat, a large amount of lubricating oil is required to cool and lubricate the fan drive gearbox. At present, the lubrication method is relatively simple and the cooling efficiency is low, resulting in more power loss due to oil agitation and high oil mist concentration.

[0005] Based on this, the inventor of the present application proposes a gearbox and a geared turbofan engine to solve the above technical problems. Summary of the Utility Model

[0006] The technical problem to be solved by the utility model is to overcome the defect of low lubrication efficiency of the gearbox in the prior art, and provide a gearbox and a geared turbofan engine.

[0007] The utility model solves the above technical problems through the following technical solutions:

[0008] The utility model provides a gearbox, which includes a sun gear, a plurality of planet gears meshing with each other, an internal gear ring sleeved outside the planet gears, and a planet carrier arranged between the sun gear, the planet gears, and the internal gear ring; the feature is that

[0009] it further includes an oil distribution plate and an oil distribution board connected to the oil distribution plate, and the oil distribution plate is installed on one side of the planet carrier;

[0010] the oil distribution board is arranged between two adjacent planet gears and the planet carrier, and at least two groups of oil distribution channels are opened on the oil distribution board to flow to the meshing area between the sun gear and the planet gears.

[0011] According to an embodiment of the present invention, two independent oil cavities are provided on the oil distribution disc, one of which flows to the oil distribution plate and the other flows to the bearing of the planetary gear.

[0012] According to an embodiment of the present invention, an oil supply gap is formed between one side of the planet carrier located between two planet gears and one of the planet gears, and a mating gap is formed between the other side and the other planet gear;

[0013] One of the oil distribution channels flows towards the oil supply gap, and under the rotation of the sun gear, the oil is conveyed through the oil supply gap to the meshing area between the planet gear and the internal gear ring;

[0014] The other of the oil distribution channels flows towards the meshing area between the sun gear and the planet gear in a direction away from the mating gap.

[0015] According to an embodiment of the present invention, the oil distribution channel facing the oil supply gap is inclined in the direction of the oil supply gap.

[0016] According to an embodiment of the present invention, the oil distribution plate includes three oil distribution channels, and two of the oil distribution channels respectively flow to the meshing areas between the sun gear and the two planet gears;

[0017] Another oil distribution channel flows to the oil supply gap.

[0018] According to an embodiment of the present invention, the side of the oil distribution plate facing the planet gear is arc-shaped.

[0019] According to an embodiment of the present invention, the oil distribution disc and the oil distribution plate are connected by a threaded connector.

[0020] According to an embodiment of the present invention, a torque transmission bracket is further included, and one end of the torque transmission bracket is connected to the planet carrier by a torque transmission pin.

[0021] According to an embodiment of the present invention, an anti-rotation pin is inserted through the planet carrier, and one end of the anti-rotation pin extends to the torque transmission pin and is connected to the torque transmission pin.

[0022] The present invention also provides a geared turbofan engine, characterized in that it includes the gearbox as described above.

[0023] According to an embodiment of the present invention, when the gearbox is in operation, the lubricating oil used per kilowatt power loss is not higher than 0.4 L / min, and the lubricating oil pressure of each nozzle is at least not lower than 0.3 MPa.

[0024] The positive and progressive effects of the present invention are as follows:

[0025] The gearbox of the present utility model uses an oil distribution plate and an oil separation plate to supply oil to the planet carrier, sun gear, and internal gear ring, eliminating the separate oil supply at the meshing point between the planetary gear of the fan-driven gearbox and the internal gear ring, improving the overall cooling efficiency of the lubricating oil, reducing the amount of lubricating oil required for gearbox cooling, reducing oil churning, and lowering the oil mist concentration inside the gearbox, improving the transmission efficiency of the drive gearbox, thereby improving the fuel efficiency of the aeroengine, reducing the fuel cost of the aeroengine, reducing the heat generated by the gearbox, thereby reducing the lubricating oil demand of the gearbox, further reducing the requirements for the performance of the engine oil pump, thereby achieving the effect of weight reduction, reducing the requirements for the lubricating oil reserve of the aeroengine, and thus achieving the effect of reducing the size of the lubricating oil tank and the weight of the lubricating oil tank and lubricating oil. Description of the Drawings

[0026] The above and other features, properties, and advantages of the present utility model will become more apparent from the following description in conjunction with the drawings and embodiments, where:

[0027] Figure 1 is a cross-sectional view of the gearbox of the present utility model at an angle;

[0028] Figure 2 is a cross-sectional view of the gearbox of the present utility model at another angle.

[0029] 1. Sun gear;

[0030] 2. Planetary gear; 21. Bearing; 22. Oil supply gap; 23. Fit gap;

[0031] 3. Internal gear ring;

[0032] 4. Planet carrier; 41. Anti-rotation pin;

[0033] 5. Oil distribution plate; 51. Oil cavity;

[0034] 6. Oil separation plate; 61. Oil separation flow channel;

[0035] 7. Torsion bracket; 71. Torque transmission pin. Detailed Embodiments

[0036] The present utility model will be further described below in conjunction with specific embodiments and the drawings. More details are elaborated in the following description to facilitate a full understanding of the present utility model. However, the present utility model can obviously be implemented in many other ways different from this description. Those skilled in the art can make similar extensions and deductions according to the actual application situation without departing from the connotation of the present utility model. Therefore, the protection scope of the present utility model should not be limited by the content of this specific embodiment.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0038] Please refer to Figure 1 and Figure 2 , the present utility model provides a gearbox, which includes a sun gear 1, a plurality of planet gears 2 that mesh with each other, an internal gear ring 3 sleeved outside the planet gears 2, and a planet carrier 4 disposed between the sun gear 1, the planet gears 2, and the internal gear ring 3.

[0039] The gearbox further includes an oil distribution plate 5 and an oil distribution board 6 connected to the oil distribution plate 5, and the oil distribution plate 5 is installed on one side of the planet carrier 4. Among them, the oil distribution board 6 is disposed between two adjacent planet gears 2 and the planet carrier 4, and at least two groups of oil distribution channels 61 are formed on the oil distribution board 6 to flow to the meshing area between the sun gear 1 and the planet gears 2.

[0040] There is no need to supply oil separately to the meshing point between the planet gear 2 and the internal gear ring 3. The lubricating oil is transported to the meshing point between the planet gear 2 and the internal gear ring 3 by the oil distribution channels 61 under the rotation of the planet gear 2 and the sun gear 1, improving the overall cooling efficiency of the lubricating oil, reducing the amount of lubricating oil required for the cooling of the gearbox, reducing the oil agitation situation and lowering the oil mist concentration in the box body, thereby improving the fuel of the aeroengine and reducing the fuel cost of the aeroengine.

[0041] By providing at least two oil distribution channels 61, they respectively flow to the meshing area between the sun gear 1 and the planet gears 2.

[0042] Because the oil distribution channels 61 improve the lubrication efficiency of the fuel for the sun gear 1, the planet gears 2, and the internal gear ring 3, the heat generated by oil agitation during the operation of the gearbox is reduced, which is beneficial to reducing the lubricating oil demand of the gearbox, lowering the requirements for the performance of the lubricating oil pump of the engine, and thus achieving the effect of weight reduction; at the same time, it also reduces the requirements for the lubricating oil reserve of the aeroengine, thereby achieving the effects of reducing the size of the lubricating oil tank and reducing the weight of the lubricating oil tank and the lubricating oil.

[0043] In one embodiment, two independent oil cavities 51 are provided on the oil distribution plate 5, one of which flows to the oil distribution board 6 and the other flows to the bearing 21 of the planet gear 2.

[0044] That is to say, under the cooperation of the oil distribution plate 5 and the oil distribution board 6, the oil cavity 51 can transport the lubricating oil to the meshing area of the sun gear 1, the planet gears 2, and the internal gear ring 3, and can also transport it to the bearing 21 of the planet gear 2 to meet the lubrication of the bearing 21.

[0045] Specifically, the oil cavity 51 is independently arranged and annular. The annular cavity is connected to the lower annular oil supply hole of the bearing 21 of the planet gear 2, and the lubricating oil reaches the lubrication point of the bearing 21 of the planet gear 2 through the lower annular oil supply hole.

[0046] The oil distributing plate 6 is installed between the planet carrier 4 and the two planet gears 2 and is connected to the oil cavity 51 of the oil distributing disk 5 through a pipeline. The side of the oil distributing disk 5 facing the planet gear 2 is arc-shaped, and thus a certain distance is maintained between the oil distributing disk 5 and the planet gear 2 to reduce the wind resistance of the planet gear 2 and enable the lubricating oil to be carried by the rotation of the planet gear 2 to the meshing point between the planet gear 2 and the internal gear ring 3, improving the transmission efficiency of the gearbox and the lubricating oil cooling efficiency.

[0047] Specifically, please refer to Figure 2 , a lubricating oil supply gap 22 is formed between one of the two planet gears 2 connected to one side of the sun gear 1 and the planet carrier 4, and a mating gap 23 is formed between the other planet gear 2 and the planet carrier 4. One of the oil distribution channels 61 flows to the lubricating oil supply gap 22 and conveys the oil to the meshing area between the planet gear 2 and the internal gear ring 3 under the rotation of the sun gear 1. The other of the oil distribution channels 61 flows in a direction away from the mating gap 23 to the meshing area between the sun gear 1 and the planet gear 2.

[0048] Please refer to Figure 2 , for example, when the sun gear 1 rotates clockwise, both of the two planet gears 2 meshing with the sun gear 1 rotate counterclockwise. A lubricating oil supply gap 22 is formed between the left planet gear 2 and the planet carrier 4, and the lubricating oil is conveyed along the lubricating oil supply gap 22 to the meshing point between the left planet gear 2 and the internal gear ring 3.

[0049] However, the mating gap 23 between the right planet gear 2 and the planet carrier 4 cannot temporarily store the lubricating oil and does not lubricate the meshing point between the internal gear ring 3 and the planet gear 2.

[0050] However, multiple planet gears 2 are arranged on the circumferential side of the sun shaft, and there is also a flow channel in the oil distributing plate 6 below the right planet gear 2 flowing to the lubricating oil supply gap 22 of the planet carrier 4 to lubricate the meshing point between the planet gear 2 and the internal gear ring 3.

[0051] That is to say, a lubricating oil supply gap 22 and a mating gap 23 are formed by the cooperation between each planet gear 2 and the planet carrier 4. The lubricating oil supply gap 22 is used to convey the lubricating oil to the meshing point between the planet gear 2 and the internal gear ring 3, and the mating gap 23 is for cooperating with the lubricating oil supply gap 22 to meet the normal rotation of the planet gear 2.

[0052] Figure 2 The meshing transmission between one sun gear 1 and two planet gears 2 is taken as an example for illustration in

[0053] It should be noted that on both sides of a diverter plate 6, there is a corresponding oil supply gap 22 and a mating gap 23 respectively. The oil supply gap 22 is used to convey lubricating oil to the meshing point of the internal gear ring 3 and the planet gear 2 under the rotation of the planet gear 2. The mating gap 23 only plays a mating role and will not affect the conveyance of the lubricating oil.

[0054] Referring to Figure 2 , the oil diversion flow channel 61 facing the oil supply gap 22 is inclined in the direction of the oil supply gap 22.

[0055] That is, in order to increase the amount of lubricating oil conveyed to the meshing point of the internal gear ring 3 and the planet gear 2 through the oil supply gap 22, one of the oil diversion flow channels 61 (A) is set to be inclined in the direction of the internal gear ring 3, so that it is convenient for more lubricating oil to reach the meshing point of the internal gear ring 3 and the planet gear 2, and the lubrication efficiency of the planet gear 2 and the internal gear ring 3 is improved.

[0056] The other two oil diversion flow channels 61 (B, C) are respectively directed towards the meshing areas corresponding to the planet gear 2 and the sun gear 1, so as to meet the lubrication requirements of the sun gear 1, the planet gear 2 and the internal gear ring 3, and improve the transmission efficiency of the gearbox.

[0057] In one embodiment, the oil diversion disk 5 and the diverter plate 6 are connected by threaded connectors. The gearbox further includes a torque transmission support 7, and the torque transmission support 7 is used for supporting, and one end is connected to each planet carrier 4 by a torque transmission pin 71.

[0058] The threaded connectors can be bolts, screws, etc., which are not limited herein.

[0059] Furthermore, an anti-rotation pin 41 is inserted through the planet carrier 4, and one end of the anti-rotation pin 41 extends to the torque transmission pin 41 and is connected to the torque transmission pin 71.

[0060] That is, the planet carrier 4 and the torque transmission support 7 are fixed parts and are connected by a spherical plain bearing 21 or a torque transmission pin 71.

[0061] The present utility model also proposes a gear-driven turbofan engine, including the above-mentioned gearbox.

[0062] In one embodiment, in order to control the oil supply amount of the gearbox, the lubricating oil used per kilowatt power loss is not higher than 0.4 L / min.

[0063] Specifically, by adjusting the aperture of each nozzle on the diverter plate 6, the flow rate and oil pressure of each nozzle are adjusted, so that when the gearbox operates under full power, the lubricating oil used per kilowatt power loss does not exceed 0.4 L / min, and the lubricating oil pressure of each nozzle is maintained above 0.3 MPa.

[0064] In summary, for the gearbox of the present utility model, the oil distributor plate 5 and the oil separation plate 6 are used to supply oil to the planet carrier 4, the sun gear 1, and the internal gear ring 3, eliminating the separate oil supply at the meshing point between the planetary gear 2 of the fan-driven gearbox and the internal gear ring 3, improving the overall cooling efficiency of the lubricating oil, reducing the oil churning situation and lowering the oil mist concentration inside the gearbox, enhancing the transmission efficiency of the drive gearbox, thereby improving the fuel efficiency of the aeroengine, reducing the fuel cost of the aeroengine, reducing the heat generated by the gearbox, thereby reducing the lubricating oil demand of the gearbox, further reducing the requirements for the performance of the engine oil pump, thus achieving the effect of weight reduction, reducing the requirements for the lubricating oil reserve of the aeroengine, and thus achieving the effect of reducing the size of the lubricating oil tank and the weight of the lubricating oil tank and the lubricating oil.

[0065] In the description of the embodiments of the present application, unless otherwise clearly specified and defined, technical terms such as "installation", "connection", "connection", "fixation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0066] The present application uses specific terms to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" mean a certain feature, structure, or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that the "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more at different positions in this specification is not necessarily the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the present application can be appropriately combined.

[0067] Although the present utility model is disclosed above with preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present utility model. Therefore, any modifications, equivalent changes, and decorations made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall fall within the protection scope defined by the claims of the present utility model.

Claims

1. A gearbox, comprising a sun gear, a plurality of planet gears meshing with each other, an internal gear ring sleeved outside the planet gears, and a planet carrier disposed between the sun gear, the planet gears and the internal gear ring; characterized in that, it further comprises an oil distribution disc and an oil distribution plate connected to the oil distribution disc, and the oil distribution disc is installed on one side of the planet carrier; the oil distribution plate is disposed between two adjacent planet gears and the planet carrier, and at least two groups of oil distribution channels are formed on the oil distribution plate to flow to the meshing area between the sun gear and the planet gears; an oil supply gap is formed between one side of the planet carrier located between two planet gears and one planet gear, and a mating gap is formed between the other side and the other planet gear; one of the oil distribution channels flows to the oil supply gap, and under the rotation of the sun gear, the oil is conveyed through the oil supply gap to the meshing area between the planet gear and the internal gear ring; the other of the oil distribution channels flows to the meshing area between the sun gear and the planet gears in a direction away from the mating gap.

2. The gearbox according to claim 1, characterized in that Two independent oil cavities are provided on the oil distribution disc, one of which flows to the oil distribution plate and the other flows to the bearing of the planet gear.

3. The gearbox according to claim 1, wherein, The oil distribution channel facing the oil supply gap is inclined in the direction of the oil supply gap.

4. The gearbox according to claim 1, characterized in that, The oil distribution plate comprises three oil distribution channels, and two of the oil distribution channels respectively flow to the meshing areas between the sun gear and the two planet gears; and there is another oil distribution channel flowing to the oil supply gap.

5. The gearbox according to claim 1, characterized in that, The side of the oil distribution plate facing the planet gear is arc-shaped.

6. The gearbox according to claim 1, characterized in that, The oil distribution disc and the oil distribution plate are connected by a threaded connector.

7. The gearbox according to claim 1, characterized in that, It further comprises a torque transmission bracket, and one end of the torque transmission bracket is connected to the planet carrier by a torque transmission pin.

8. The gearbox according to claim 7, characterized in that, An anti-rotation pin is inserted through the planet carrier, and one end of the anti-rotation pin extends to the torque transmission pin and is connected to the torque transmission pin.

9. A gear-driven turbofan engine, characterized in that, It includes the gearbox according to any one of claims 1-8.

10. The gear-driven turbofan engine according to claim 9, wherein, Under the operating state of the gearbox, the lubricating oil used for each kilowatt of power loss is not higher than 0.4 L / min, and the lubricating oil pressure of each nozzle is at least not lower than 0.3 MPa.

Images