Helicopter main reduction gear bearing lubrication structure

Abstract

The utility model provides a kind of helicopter main speed reducer bearing lubricating structure, belong to the field of aircraft. Helicopter main speed reducer bearing lubricating structure includes support machine case, bearing bush mounted on support machine case and bearing installed in bearing bush, bearing is used to connect the main rotor shaft of helicopter, support machine case is equipped with oil circuit, and the inner wall of the mounting hole of support machine case bearing bush is equipped with oil outlet with oil circuit communication;The inner wall of bearing bush has first recess with oil outlet communication, and the top flange lower end surface of bearing bush is equipped with second recess, second recess is communicated with first recess, and the top of second recess is higher than bearing outer ring, to form the passage for lubricating oil to pass through bearing outer ring and reach the annular space between bearing inner and outer rings. The utility model sends lubricating oil to the upper surface of bearing, lubricating oil is lubricated to bearing from top to bottom under the action of gravity, improves the effect of lubrication, avoids the problem of uneven lubrication, prolongs the service life of bearing.

Description

Technical Field

[0001] This utility model relates to the field of aircraft technology, specifically to a lubrication structure for a helicopter main gear reducer bearing. Background Technology

[0002] The main gearbox of current helicopters is connected to the main rotor shaft via double-row angular contact bearings. Splash lubrication is commonly used for these bearings. However, because the main rotor shaft is vertically oriented, and the double-row angular contact bearings have two rows of balls, splash lubrication results in uneven lubrication between the upper and lower balls. The continuous agitation of the lubricating oil by the rotating components generates heat, causing the oil temperature to rise, accelerating oil oxidation and deterioration, and shortening oil change intervals. Utility Model Content

[0003] This invention provides a lubrication structure for the bearing of a helicopter main gearbox, aiming to at least partially solve the above-mentioned technical problems.

[0004] As a first aspect of this utility model, a lubrication structure for a helicopter main gearbox bearing is provided, comprising: a support housing, a bearing bushing mounted on the support housing, and a bearing mounted inside the bearing bushing. The bearing is used to connect to the main rotor shaft of the helicopter. The support housing is provided with an oil passage. The inner wall of the mounting hole of the bearing bushing in the support housing is provided with an oil outlet communicating with the oil passage. The inner wall of the bearing bushing has a first groove communicating with the oil outlet. A second groove is provided at the lower end face of the top flange of the bearing bushing. The second groove communicates with the first groove, and the top of the second groove is higher than the outer ring of the bearing, so as to form a channel for lubricating oil to pass through the outer ring of the bearing and reach the annular space between the inner and outer rings of the bearing.

[0005] The inner wall of the mounting hole of the supporting casing is provided with an annular groove, and the oil outlet of the oil passage is located in the annular groove.

[0006] The oil passage includes a first oil passage, a second oil passage, and a third oil passage formed by drilling inside the support casing. The first oil passage connects the annular groove to the lower end face of the support casing. The second oil passage connects the first oil passage to the outer annular surface of the support casing. The third oil passage connects the second oil passage to the upper end face of the support casing. Plugs are provided at the ends of the first and second oil passages.

[0007] The bearing in question is a double-row angular contact bearing.

[0008] The depth of the annular groove is 0.5~1mm.

[0009] The number of the first groove and the second groove is two or more.

[0010] The first groove and the second groove are arc-shaped grooves.

[0011] The first groove and the second groove have the same radius and are coaxially arranged.

[0012] The depth of the second groove is 0.5~1mm.

[0013] Based on the above solutions, it can be seen that the construction components, module confirmation method and device, and manufacturing method of this utility model, which adopt modular settings, have at least the following beneficial effects compared with the prior art:

[0014] The helicopter main gearbox bearing lubrication structure of this utility model, by setting an oil passage on the support casing and setting a first groove and a second groove on the bearing bushing, can deliver lubricating oil to the upper surface of the bearing. Then, the lubricating oil lubricates the bearing from top to bottom under the action of gravity, which improves the lubrication effect, avoids the problem of uneven lubrication, significantly extends the service life of the bearing, and slows down the problem of oil oxidation and deterioration caused by oil temperature rise, thereby increasing the oil change cycle. Attached Figure Description

[0015] To more clearly illustrate the technical solution of this utility model, the accompanying drawings used in the embodiments will be briefly introduced below.

[0016] Figure 1 This is a schematic diagram of the bearing lubrication structure of the helicopter main gear reducer according to this utility model;

[0017] Figure 2 A cross-sectional view of the supporting casing;

[0018] Figure 3 This is a schematic diagram of a bearing bushing.

[0019] In the diagram: 1. Support casing; 2. Bearing bushing; 3. Bearing; 4. Main rotor shaft; 11. First oil passage; 12. Second oil passage; 13. Third oil passage; 14. Plug; 15. Annular groove; 21. First groove; 22. Second groove. Detailed Implementation

[0020] To better understand the technical solutions of the embodiments of this utility model, the embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0021] It should be understood that the described embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0022] like Figures 1 to 3As shown in the figure, this utility model discloses a helicopter main gearbox bearing lubrication structure. The helicopter main gearbox bearing lubrication structure includes a support housing 1, a bearing bushing 2 mounted on the support housing 1, and a bearing 3 mounted in the bearing bushing 2. The bearing 3 is used to connect the helicopter's main rotor shaft 4.

[0023] The support housing 1 is equipped with an oil passage, and the inner wall of the mounting hole for the bearing bushing 2 in the support housing 1 has an oil outlet communicating with the oil passage. The inner wall of the bearing bushing 2 has a first groove 21 communicating with the oil outlet, and a second groove 22 is provided at the lower end face of the top flange of the bearing bushing 2. The second groove 22 communicates with the first groove 21, and the top of the second groove 22 is higher than the outer ring of the bearing 3, so as to form a channel for lubricating oil to pass through the outer ring of the bearing 3 and reach the annular space between the inner and outer rings of the bearing 3. The lubricating oil first enters the first groove 21 of the bearing bushing from the oil outlet. Since the first groove 21 and the second groove 22 are connected, the first groove 21 and the second groove 22, together with the outer wall of the bearing, form a channel for the flow of lubricating oil, so the lubricating oil can enter the second groove 22 from the first groove. Since the top of the second groove 22 is higher than the outer ring of the bearing, as lubricating oil continuously enters the second groove 22, the lubricating oil will rise continuously in the second groove 22, and then overflow from the top of the outer ring of the bearing 3, and flow downward into the channel of the annular space between the inner and outer rings of the bearing 3 under the action of gravity.

[0024] The helicopter main gearbox bearing lubrication structure of this utility model provides lubricating oil by setting an oil passage on the support housing 1 and setting a first groove 21 and a second groove 22 on the bearing bushing 2. This allows lubricating oil to be delivered to the upper surface of the bearing 3, and then the lubricating oil lubricates the bearing from top to bottom under the action of gravity. This improves the lubrication effect, avoids the problem of uneven lubrication, significantly extends the service life of the bearing, and slows down the problem of oil oxidation and deterioration caused by oil temperature rise, thereby increasing the oil change cycle.

[0025] Furthermore, an annular groove 15 is provided on the inner wall of the mounting hole of the support casing 1, and the oil outlet of the oil passage is located in the annular groove 15. This allows lubricating oil to be discharged into the annular groove. As long as the oil inlet of the bearing bushing 2 is aligned with the annular groove, lubricating oil can enter the bearing bushing 2. In this embodiment, the bearing 3 is a double-row angular contact bearing. Of course, the bearing 3 can also be other types of bearings.

[0026] Depend on Figure 1 and Figure 2It is understood that the oil passages include a first oil passage 11, a second oil passage 12, and a third oil passage 13 formed by drilling inside the support casing 1. The first oil passage 11 connects the annular groove 15 to the lower end face of the support casing 1; the second oil passage 12 connects the first oil passage 11 to the outer annular surface of the support casing 1; and the third oil passage 13 connects the second oil passage 12 to the upper end face of the support casing 1. Plugs 14 are provided at the ends of the first oil passage 11 and the second oil passage 12. The depth of the annular groove 15 is preferably 0.5~1mm.

[0027] In this embodiment, the number of the first groove 21 and the second groove 22 is set to one. In other embodiments, the number of the first groove 21 and the second groove 22 is two or more to improve the oil supply. A plurality of the first groove and the second groove 22 may be evenly arranged along the axis of the bearing bushing.

[0028] In this embodiment, the first groove 21 and the second groove 22 are arc-shaped grooves, which can be milled simultaneously from the inner wall of the bearing bushing and the flange using the same milling cutter. The first groove 21 and the second groove 22 can also be square grooves or other structures. The first groove 21 and the second groove 22 can also be machined separately, achieving communication between them during the machining process.

[0029] The first groove 21 and the second groove 22 have the same radius and are coaxially arranged, so they can be machined using the same tool. The depth of the second groove 22 is 0.5~1mm, which can ensure the oil supply effect while reducing damage to the structure.

[0030] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A lubrication structure for a helicopter main gearbox bearing, comprising a support housing, a bearing bushing mounted on the support housing, and a bearing mounted within the bearing bushing, wherein the bearing is used to connect to the helicopter's main rotor shaft, characterized in that, The support housing is provided with an oil passage, and the inner wall of the mounting hole for mounting the bearing bushing in the support housing is provided with an oil outlet communicating with the oil passage; the inner wall of the bearing bushing has a first groove communicating with the oil outlet, and a second groove is provided at the lower end face of the top flange of the bearing bushing. The second groove communicates with the first groove, and the top of the second groove is higher than the outer ring of the bearing, so as to form a channel for lubricating oil to pass through the outer ring of the bearing and reach the annular space between the inner and outer rings of the bearing.

2. The helicopter main gearbox bearing lubrication structure according to claim 1, characterized in that, The inner wall of the mounting hole of the supporting casing is provided with an annular groove, and the oil outlet of the oil passage is located in the annular groove.

3. The helicopter main gearbox bearing lubrication structure according to claim 2, characterized in that, The oil passage includes a first oil passage, a second oil passage, and a third oil passage formed by drilling inside the support casing. The first oil passage connects the annular groove to the lower end face of the support casing. The second oil passage connects the first oil passage to the outer annular surface of the support casing. The third oil passage connects the second oil passage to the upper end face of the support casing. Plugs are provided at the ends of the first and second oil passages.

4. The helicopter main gearbox bearing lubrication structure according to claim 2, characterized in that, The bearing is a double-row angular contact bearing.

5. The helicopter main gearbox bearing lubrication structure according to claim 2, characterized in that, The depth of the annular groove is 0.5~1mm.

6. The helicopter main gearbox bearing lubrication structure according to claim 1, characterized in that, The number of the first groove and the second groove is two or more.

7. The helicopter main gearbox bearing lubrication structure according to claim 6, characterized in that, The first groove and the second groove are arc-shaped grooves.

8. The helicopter main gearbox bearing lubrication structure according to claim 6, characterized in that, The first groove and the second groove have the same radius and are coaxially arranged.

9. The helicopter main gearbox bearing lubrication structure according to claim 8, characterized in that, The depth of the second groove is 0.5~1mm.

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