Aero-engine bearing seat structure with multi-point combined lubrication function

Abstract

The application belongs to the field of engine bearing design and relates to an aero-engine bearing seat structure with a multi-point combined lubrication function, which comprises a bearing base, a main bearing and a bearing sleeve. An oil pipe is arranged on the outer end of the bearing base, a plurality of groups of oil passages are arranged in the bearing base, an annular oil guide flow path is arranged on the bearing base, an internal oil guide flow path is arranged in the bearing sleeve and communicates with the annular oil guide flow path, and a main bearing outer ring oil hole is arranged on the bearing outer ring and communicates with the internal oil guide flow path. The oil enters the annular oil guide flow path through the oil passages, part of the oil flows along the circumference of the annular oil guide flow path, and the other part of the oil enters the main bearing outer ring oil hole and then directly flows into the main bearing in the bearing outer ring, so that the main bearing is lubricated. While achieving bearing lubrication, the oil pipe is combined with the bearing base, and the internal structure of the bearing cavity is simplified in the limited space.

Description

Technical Field

[0001] This application belongs to the field of engine bearing design, and specifically relates to an aero-engine bearing housing structure with multi-point combined lubrication function. Background Technology

[0002] The function of the bearing cavity in an aircraft engine is to support the main bearing and the high- and low-pressure rotor shafts, and to provide a relatively enclosed lubrication environment for the main bearing. Oil lines and nozzles are installed within the bearing cavity for cooling and lubrication of the main bearing.

[0003] End-face jet lubrication is a commonly used method for lubricating main bearings in engines. An oil supply line 1 is arranged inside the bearing cavity. Oil is sprayed into the bearing cavity from the side of the bearing housing 3 using an oil nozzle 2 at the end of the oil supply line 1, thus lubricating and cooling the main bearing 16. The oil supply line 1 and the oil nozzle 2 are fixed to the bearing cavity structure with screws. Figure 1 As shown.

[0004] Main drawbacks of existing technology:

[0005] 1. Due to the compact space inside the bearing cavity, the piping layout for this lubrication method is limited by space constraints;

[0006] 2. If nozzles are set at multiple angles to spray oil onto the bearing, the length and weight of the pipeline will increase significantly.

[0007] 3. The oil supply line inside the bearing cavity is relatively long, which makes it more susceptible to fatigue or cracking under engine vibration conditions, resulting in low reliability.

[0008] 4. Lubricating oil only dissipates heat from the bearing and cannot cool the bearing housing structure, which can easily lead to thermal stress between the bearing and the bearing housing.

[0009] How to adequately lubricate and dissipate heat from bearings within a limited space is a problem that needs to be solved. Summary of the Invention

[0010] The purpose of this application is to provide an aircraft engine bearing housing structure with multi-point combined lubrication function to solve the problems of limited layout space, large weight and low reliability of existing bearing lubrication structures.

[0011] The technical solution of this application is: an aero-engine bearing housing structure with multi-point combined lubrication function, including a bearing base, a main bearing, and a bearing ring; an oil pipeline is provided on the outer end of the bearing base, and multiple sets of oil channels are provided circumferentially at intervals inside the bearing base; an annular oil guide path is provided on the inner ring surface of the bearing base, and the oil channels are connected between the oil pipeline and the annular oil guide path; the main bearing includes a bearing outer ring, and the bearing ring is sealed between the bearing base and the bearing outer ring; an internal oil guide path is provided inside the bearing ring and communicates with the annular oil guide path; and an oil hole for the main bearing outer ring is provided on the bearing outer ring and communicates with the internal oil guide path.

[0012] Preferably, the lubricating oil channels are arranged in multiple sets at intervals along the circumference of the bearing rings, the bearing base has internal channels between the lubricating oil channels, and the outer wall of the bearing base has lubricating oil nozzles that communicate with the internal channels, with the outlet of the lubricating oil nozzles facing the inner side of the outer ring of the bearing.

[0013] Preferably, the lubricating oil nozzles are provided in at least two sets and are evenly arranged along the circumference of the bearing ring.

[0014] Preferably, an installation ring is integrally provided on the outer side of the bearing base, and the installation ring is provided with a screw hole and connected to the engine bearing cavity through the screw hole.

[0015] Preferably, the internal oil guide pipeline includes an oil inlet and an annular oil storage cavity. The oil inlet is connected to the annular oil guide flow path, the annular oil storage cavity is a complete ring structure, and the annular oil guide flow path connects the oil inlet and the oil hole of the outer ring of the main bearing.

[0016] Preferably, the axial length of the annular oil guide path is greater than the axial length of the internal oil guide path.

[0017] This application discloses an aero-engine bearing housing structure with multi-point combined lubrication function, comprising a bearing base, a main bearing, and bearing rings. The outer end of the bearing base has an oil passage, and multiple sets of oil channels are spaced apart inside the bearing base. An annular oil guide path is formed on the bearing base, and an internal oil guide path communicating with the annular oil guide path is formed inside the bearing rings. An oil hole for the main bearing outer ring is formed on the bearing outer ring and communicates with the internal oil guide path. Lubricating oil enters the annular oil guide path through the oil channels. Part of the lubricating oil flows evenly along the circumference of the annular oil guide path, while another part enters the oil hole for the main bearing outer ring, thus flowing directly into the main bearing inside the outer ring to lubricate the main bearing. By combining the oil passage with the bearing base while simultaneously lubricating the bearing, the internal structure of the bearing cavity is simplified within a limited space. Attached Figure Description

[0018] To more clearly illustrate the technical solutions provided in this application, the accompanying drawings will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application.

[0019] Figure 1 This is a schematic diagram of the end-face jet bearing lubrication structure in the background technology.

[0020] Figure 2 This is a front view of the bearing housing structure of this application;

[0021] Figure 3 for Figure 2 Schematic diagram of the JJ cross section;

[0022] Figure 4 for Figure 3 Enlarged view of section A in the middle;

[0023] Figure 5 for Figure 2 Schematic diagram of the EE section.

[0024] 1. Oil supply line; 2. Oil supply nozzle; 3. Bearing housing; 4. Bearing base; 5. Bearing outer ring; 6. Bearing race; 7. Lubricating oil line; 8. Lubricating oil passage; 9. Annular oil guide line; 10. Internal oil guide path; 11. Internal channel; 12. Lubricating oil nozzle; 13. Mounting ring; 14. Oil inlet hole; 15. Annular oil reservoir; 16. Main bearing; 17. Main bearing outer ring oil hole. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] A bearing housing structure for an aircraft engine with multi-point combined lubrication function, such as Figure 2-4 It includes the bearing base 4, the main bearing 16, and the bearing ring 6.

[0027] An oil passage 7 is provided on the outer end of the bearing base 4, which is connected to the oil supply passage 1. Multiple sets of oil channels 8 are provided circumferentially inside the bearing base 4. An annular oil guide passage 9 is provided on the inner ring surface of the bearing base 4, and the oil channels 8 are connected between the oil passage 7 and the annular oil guide passage 9. The main bearing 16 includes an outer ring 5, a ball bearing, and an inner ring. The connection structure of the outer ring 5, the ball bearing, and the inner ring is the existing structure, and will not be described in detail. The bearing ring 6 is sealed between the bearing base 4 and the outer ring 5. An internal oil guide passage (10) connected to the annular oil guide passage 9 is provided inside the bearing ring 6. An oil hole of the outer ring 5 of the main bearing 16 is provided on the outer ring 5, which is connected to the internal oil guide passage (10). The axial length of the annular oil guide passage 9 is greater than the axial length of the internal oil guide passage 10.

[0028] The lubricating oil in the oil supply line 1 enters the lubricating oil line 7 located in the bearing base 4, and then enters the annular oil guide path 9 through the lubricating oil passage 8. Part of the lubricating oil flows evenly along the circumference of the annular oil guide path 9, while the other part enters the oil hole in the outer ring 5 of the main bearing 16, thus flowing directly into the main bearing 16 inside the outer ring 5 to lubricate the main bearing 16. While achieving bearing lubrication, the combination of the lubricating oil line 7 and the bearing base 4 simplifies the internal structure of the bearing cavity within a limited space, avoiding problems such as cracks and joint leaks caused by pipeline layout, and improving the reliability of engine operation.

[0029] Meanwhile, as the lubricating oil flows through the lubricating oil pipes and lubricating oil channels 8, it carries away the heat transferred from the bearing to the bearing housing 3, indirectly cooling the outer ring 5 of the bearing and further reducing the overall temperature of the main bearing 16.

[0030] Preferably, the lubricating oil channels 8 are arranged in multiple sets at intervals along the circumference of the bearing rings 6. The bearing base 4 has internal channels 11 between the lubricating oil channels 8. The outer wall of the bearing base 4 is provided with lubricating oil nozzles 12 that communicate with the internal channels 11. The outlet of the lubricating oil nozzles 12 faces the inner side of the outer ring 5 of the bearing. Most of the lubricating oil entering the annular oil guide path 9 flows in the opposite direction into the internal channels 11 arranged circumferentially alongside the lubricating oil channels 8, and then flows into the lubricating oil nozzles 12 through the internal channels 11. The lubricating oil nozzles 12 provide spray lubrication to the ball bearing. The lubricating oil nozzles 12 and the bearing base 4 are integrated into a single design, eliminating the need for additional space structures. Furthermore, both spray lubrication and immersion lubrication are achieved simultaneously for the ball bearing, resulting in a more comprehensive and uniform lubrication effect.

[0031] Preferably, at least two sets of lubricating oil nozzles 12 are provided and evenly arranged along the circumference of the bearing base 4, that is, the number of lubricating oil nozzles 12 can be three, four or more sets. The flow path inside the lubricating oil nozzle 12 has a U-shaped structure, and the lubricating oil nozzle 12 and the bearing base 4 can be connected by bolts, welding or integral molding.

[0032] Preferably, an installation ring 13 is integrally provided on the outer side of the bearing base 4. The installation ring 13 has a screw hole and is connected to the engine bearing cavity through the screw hole to fix the bearing base.

[0033] Combination Figure 5 Preferably, the internal oil guide channel 10 includes an oil inlet 14 and an annular oil reservoir 15. The oil inlet 14 is connected to the annular oil guide flow path 9. The annular oil reservoir 15 has a complete ring structure, and the annular oil guide flow path 9 connects the oil inlet 14 and the oil hole of the outer ring 5 of the main bearing 16. The lubricating oil entering the annular oil guide flow path 9 enters the annular oil reservoir 15 through the oil inlet 14. Then, the lubricating oil in the annular oil reservoir 15 flows evenly inside it, and then enters the oil holes of the outer ring 5 of the bearing located at different positions to lubricate the ball bearing, thereby further improving the uniformity of lubrication.

[0034] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0035] Secondly: The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other.

[0036] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An aircraft engine bearing housing structure with multi-point combined lubrication function, characterized in that: The bearing includes a bearing base (4), a main bearing (16), and a bearing ring (6); the bearing base (4) has an oil pipe (7) on its outer end, and multiple sets of oil channels (8) are spaced apart circumferentially inside the bearing base (4). An annular oil guide path (9) is provided on the inner ring surface of the bearing base (4). The oil channel (8) is connected between the oil pipe (7) and the annular oil guide path (9). The main bearing (16) includes a bearing outer ring (5). The bearing ring (6) is sealed between the bearing base (4) and the bearing outer ring (5). An internal oil guide path (10) is provided inside the bearing ring (6) and is connected to the annular oil guide path (9). The bearing outer ring (5) is provided with an oil hole for the outer ring (5) of the main bearing (16) and is connected to the internal oil guide path (10). The lubricating oil channels (8) are arranged in multiple sets and spaced along the circumference of the bearing ring (6). The bearing base (4) has internal channels (11) arranged side by side between the lubricating oil channels (8). The outer wall of the bearing base (4) is provided with lubricating oil nozzles (12) that communicate with the internal channels (11). The outlet position of the lubricating oil nozzles (12) faces the inner side of the outer ring (5) of the bearing. The lubricating oil in the oil supply line (1) enters the lubricating oil line (7) located in the bearing base (4), and then enters the annular oil guide flow path through the lubricating oil channel (8). Part of the lubricating oil flows evenly along the circumference of the annular oil guide flow path, and another part of the lubricating oil enters the oil hole of the outer ring (5) of the main bearing (16), and then flows directly into the main bearing (16) inside the outer ring (5) of the bearing to lubricate the main bearing (16). Most of the lubricating oil that enters the annular oil guide flow path flows in the opposite direction into the internal channel (11) which is arranged circumferentially alongside the lubricating oil channel (8), and flows into the lubricating oil nozzle (12) through the internal channel (11). The lubricating oil nozzle (12) sprays lubrication onto the ball bearing.

2. The aircraft engine bearing housing structure with multi-point combined lubrication function as described in claim 1, characterized in that: The lubricating oil nozzle (12) is provided in at least two sets and is evenly arranged along the circumference of the bearing base (4).

3. The aircraft engine bearing housing structure with multi-point combined lubrication function as described in claim 1, characterized in that: An installation ring (13) is integrally provided on the outer side of the bearing base (4), and the installation ring (13) is provided with a screw hole and is connected to the engine bearing cavity through the screw hole.

4. The aircraft engine bearing housing structure with multi-point combined lubrication function as described in claim 1, characterized in that: The internal oil guide path (10) includes an oil inlet (14) and an annular oil storage cavity (15). The oil inlet (14) is connected to the annular oil guide path (9). The annular oil storage cavity (15) is a complete ring structure and the annular oil guide path (9) is connected between the oil inlet (14) and the oil hole of the outer ring (5) of the main bearing (16).

5. The aircraft engine bearing housing structure with multi-point combined lubrication function as described in claim 1, characterized in that: The axial length of the annular oil guide path (9) is greater than the axial length of the internal oil guide path (10).

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