High-speed bearing oil supply structure of a transmission system

Abstract

This application belongs to the field of aero-engine transmission systems, and specifically relates to a high-speed bearing oil supply structure for a transmission system. It includes: an oil supply passage formed on the outer wall of a support, and a first oil passage connected to the oil supply passage on the support; a housing fitted onto the outside of the support, with an oil inlet on the housing; a bevel gear coaxially nested inside the support, with a bearing inner ring mounting portion on the bevel gear; an end cover mounted on the upper end of the support, with a second oil passage on the end cover, a rebound structure on the end cover, and a bearing outer ring mounting portion on the end cover; the bearing inner ring of the high-speed bearing is connected to the bearing inner ring mounting portion, and the bearing outer ring is connected to the bearing outer ring mounting portion; a cage is provided between the bearing inner ring and the bearing outer ring; the high-speed bearing, the end cover, and the bevel gear together form a lubricating oil cavity; when lubricating oil enters the oil supply passage through the oil inlet, it passes through the first and second oil passages into the lubricating oil cavity, and is sprayed along the rebound structure between the bearing inner ring and the cage.

Description

Technical Field

[0001] This application belongs to the field of aero-engine transmission systems, and specifically relates to a high-speed bearing oil supply structure for a transmission system. Background Technology

[0002] As a key component of power transmission in aero-engine transmission systems, bearings are crucial for the stable operation of the entire engine. Their function is to provide support for gear shafts, withstand the loads generated by gear meshing, and transmit axial and radial loads to the transmission system's housing. Since the transmission system needs to achieve power transmission within a limited space, most existing transmission system bearing lubrication systems deliver lubricating oil through the housing's oil passages. A nozzle structure is installed near the bearing to directly inject lubricating oil at a certain supply pressure. Furthermore, the lubricating oil injected from this nozzle must not disperse to ensure accurate lubrication of the target area.

[0003] In response to the trend towards high-speed, heavy-load, and compact transmission systems, existing bearing oil supply structures are insufficient to meet the design requirements for high reliability. Especially for high-speed transmission system bearings, the existing nozzle structure, under the influence of the high-speed rotating flow field, may experience impact resistance in the oil jet, preventing efficient delivery to the lubrication and cooling points. This results in the bearing's frictional heat not being carried away by the lubricating oil in time, leading to problems such as insufficient oil and high temperatures, seriously affecting the safety of power transmission and even aircraft pilot safety.

[0004] Therefore, it is desirable to have a technical solution to overcome or at least mitigate one of the aforementioned defects of the prior art. Summary of the Invention

[0005] The purpose of this application is to provide a high-speed bearing oil supply structure for a transmission system, in order to solve the problem that, under the influence of a high-speed rotating flow field, the lubricating oil directly injected by the existing conventional oil supply nozzle is subject to impact and obstruction, causing the lubricating oil jet to deviate from the theoretical oil supply position and thus failing to effectively supply oil to the bearing.

[0006] The technical solution of this application is:

[0007] A high-speed bearing oil supply structure for a transmission system, comprising:

[0008] The support has an oil supply passage on its outer wall surface, and the support also has a first oil passage connected to the oil supply passage.

[0009] The housing is sleeved on the outside of the support, and the housing has an oil inlet that communicates with the oil supply line;

[0010] A bevel gear, which is coaxially nested inside the support, and a bearing inner ring mounting part is provided on the bevel gear;

[0011] An end cap is installed on the upper end of the support. The end cap has a second oil passage that communicates with the first oil passage. The end cap also has a rebound structure corresponding to the end of the second oil passage, and the end cap has a bearing outer ring mounting part.

[0012] A high-speed bearing, wherein the inner ring of the high-speed bearing is connected to the inner ring mounting part of the bearing, and the outer ring of the bearing is connected to the outer ring mounting part of the bearing, and a cage is provided between the inner ring and the outer ring of the bearing, and the high-speed bearing, the end cover and the bevel gear together form a lubricating cavity;

[0013] When the lubricating oil enters the oil supply circuit through the oil inlet, it passes through the first oil circuit and the second oil circuit in sequence, enters the lubricating oil chamber, and is sprayed along the rebound structure between the inner ring of the bearing and the cage.

[0014] In at least one embodiment of this application, the oil supply passage is a rectangular annular groove formed on the outer wall surface of the support.

[0015] In at least one embodiment of this application, the first oil passage and the second oil passage correspond one-to-one, and multiple passages are provided along the circumferential direction.

[0016] In at least one embodiment of this application, the axis of the first oil passage coincides with that of the corresponding second oil passage.

[0017] In at least one embodiment of this application, the rebound structure includes a groove and a guide ramp, the groove being aligned with the axis of the second oil passage.

[0018] In at least one embodiment of this application, the lower end of the bevel gear is connected to the support via a rod bearing.

[0019] The invention has at least the following beneficial technical effects:

[0020] The high-speed bearing oil supply structure of this application can efficiently supply oil under high-speed conditions, avoid the oil jet being blocked by impact, reduce the impact and blocking effect of the rotating flow field on the injected oil, and meet the requirements of engine transmission system. Attached Figure Description

[0021] Figure 1 This is a transmission system high-speed bearing oil supply structure according to one embodiment of the present application;

[0022] Figure 2 This is a schematic diagram of the rebound structure portion according to one embodiment of this application;

[0023] Figure 3 yes Figure 2 A-direction view.

[0024] in:

[0025] 1-Support; 11-Oil supply line; 12-First oil line; 2-Housing shell; 3-Bevel gear; 4-End cover; 41-Second oil line; 42-Rebound structure; 421-Groove; 422-Guide slope; 5-High-speed bearing. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0027] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this application.

[0028] The following is in conjunction with the appendix Figures 1 to 3 This application will be described in further detail.

[0029] The transmission system high-speed bearing oil supply structure of this application has a high-speed bearing 5 mounted on a bevel gear 3, which simultaneously bears the axial force and radial force generated by the meshing of the bevel gear 3. The magnitude and direction of the load on the high-speed bearing 5 are time-varying depending on the working conditions of the bevel gear 3. Considering the high temperature and negative clearance problems that may be caused by high speed and complex load, which may affect the smoothness of gear meshing, a compact oil supply structure is provided to achieve efficient oil supply for the high-speed bearing 5.

[0030] This application provides a high-speed bearing oil supply structure for a transmission system, including: a support 1, a housing 2, a bevel gear 3, an end cover 4, and a high-speed bearing 5.

[0031] Specifically, such as Figure 1As shown, the outer wall of the support 1 has an oil supply passage 11, and the support 1 also has a first oil passage 12 communicating with the oil supply passage 11. The housing 2 is sleeved on the outside of the support 1, and the housing 2 has an oil inlet communicating with the oil supply passage 11. The bevel gear 3 is coaxially nested inside the support 1, and the lower end of the bevel gear 3 is connected to the support 1 through a rod bearing. The bevel gear 3 is provided with a bearing inner ring mounting part. The end cover 4 is installed on the upper end of the support 1. The end cover 4 has a second oil passage 41 communicating with the first oil passage 12. The end cover 4 is also provided with a rebound structure 42 corresponding to the end of the second oil passage 41, and the end cover 4 is provided with a bearing outer ring mounting part. The bearing inner ring of the high-speed bearing 5 is connected to the bearing inner ring mounting part, and the bearing outer ring is connected to the bearing outer ring mounting part. A cage is provided between the bearing inner ring and the bearing outer ring. The high-speed bearing 5, the end cover 4, and the bevel gear 3 together form a lubricating cavity.

[0032] In the transmission system high-speed bearing oil supply structure of this application, after the lubricating oil enters the oil supply passage 11 through the oil inlet, it passes through the first oil passage 12 and the second oil passage 41 in sequence, enters the lubricating oil chamber, and is sprayed along the rebound structure 42 between the bearing inner ring and the cage.

[0033] In a preferred embodiment of this application, the oil supply passage 11 is a rectangular annular groove opened on the outer wall of the support 1, and the first oil passage 12 is an upwardly inclined oil passage with a circular hole-shaped cross-section that penetrates the wall of the support 1.

[0034] In a preferred embodiment of this application, the second oil passage 41 is an upwardly angled oil passage with a circular hole-shaped cross-section, opened on the end cover 4. It can be understood that the first oil passage 12 and the second oil passage 41 are in one-to-one correspondence, and multiple of them are arranged circumferentially; the axes of the first oil passage 12 and the corresponding second oil passage 41 coincide.

[0035] like Figure 2-3 As shown, in this embodiment, the rebound structure 42 is a structure with a circumferential groove 421 and a guide slope 422 on the end cap 4, located at the end of the oil passage, wherein the groove 421 is aligned with the axis of the second oil passage 41.

[0036] The transmission system high-speed bearing oil supply structure of this application includes a high-speed bearing 5 mounted on an end cover 4, which, together with a rod bearing mounted on a support 1, supports and positions the bevel gear 3. The support 1 is assembled with the housing 2. The oil supply circuit of the high-speed bearing 5 is not a conventional oil supply pipeline, but rather an integrated oil circuit composed of slots and holes on the supporting stator. Compared with ordinary oil supply pipelines, this oil supply structure with integrated oil circuits on the stator reduces the number of parts and lowers costs, while also greatly improving the reliability and maintainability of the overall transmission device.

[0037] The purpose of the special rebound structure 42 in the high-speed bearing oil supply structure of this application is that when the lubricating oil reaches the groove 421, its flow velocity is reduced due to the obstruction of the groove 421, and it is sprayed along the guide slope 422 of the rebound structure 42 into the space between the inner ring and the cage of the high-speed bearing 5. The lubricating oil sprayed from the guide slope 422 is not a conventional single cylindrical oil path. Due to the influence of the rebound structure 42, the sprayed lubricating oil is in the shape of an arc band. Complex vortex effects are generated around the high-speed bearing 5, and the surface of the rotating parts such as the high-speed bearing 5 has a significant dragging effect on the airflow. Compared with a single cylindrical oil path, the arc band oil path is less affected by the obstruction of the bearing's rotating flow field, and the arc band oil path is more conducive to entering the space between the inner ring and the cage of the bearing under the dragging effect of the airflow, so that the high-speed bearing 5 can be fully lubricated and cooled.

[0038] This application presents a high-speed bearing oil supply structure for a transmission system. This structure solves the problem of air resistance and vortex effects during high-speed rotation of the high-speed bearing 5, which obstruct and impact the injected lubricating oil, thus improving oil utilization. By integrating the oil supply circuit into the structural components, it saves on oil supply pipeline structure, improving economy. Furthermore, the simple and compact structure enhances the reliability of the overall gear transmission device, achieving the lubrication and cooling functions of the high-speed bearing 5 with fewer structural elements. This application can be applied to the oil injection lubrication and cooling design of high-speed bearings in engines under development and in service, providing a highly reliable and sophisticated technical solution for the design of high-speed bearings in advanced aero-engines.

[0039] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A high-speed bearing oil supply structure for a transmission system, characterized in that, include: Support (1), the outer wall surface of the support (1) is provided with an oil supply passage (11), and the support (1) is also provided with a first oil passage (12) connected to the oil supply passage (11). The housing (2) is sleeved on the outside of the support (1), and the housing (2) has an oil inlet that communicates with the oil supply line (11); A bevel gear (3) is coaxially nested inside the support (1), and a bearing inner ring mounting part is provided on the bevel gear (3); End cap (4), the end cap (4) is installed on the upper end of the support (1), the end cap (4) is provided with a second oil passage (41) connected to the first oil passage (12), the end cap (4) is also provided with a rebound structure (42) corresponding to the end of the second oil passage (41), and the end cap (4) is provided with a bearing outer ring mounting part; High-speed bearing (5), the inner ring of the high-speed bearing (5) is connected to the inner ring mounting part of the bearing, the outer ring of the bearing is connected to the outer ring mounting part of the bearing, a cage is provided between the inner ring of the bearing and the outer ring of the bearing, and the high-speed bearing (5), the end cover (4) and the bevel gear (3) together form a lubricating cavity. When the lubricating oil enters the oil supply passage (11) through the oil inlet, it passes through the first oil passage (12) and the second oil passage (41) in sequence, enters the lubricating oil cavity, and is sprayed along the rebound structure (42) between the bearing inner ring and the cage. The rebound structure (42) includes a groove (421) and a guide slope (422). The groove (421) is aligned with the axis of the second oil passage (41). When the lubricating oil reaches the groove (421), the flow rate is reduced due to the obstruction of the groove (421). Due to the influence of the rebound structure (42), the sprayed lubricating oil is in the shape of an arc. The arc-shaped oil passage is more conducive to entering the bearing inner ring and the cage under the dragging effect of the airflow.

2. The high-speed bearing oil supply structure for the transmission system according to claim 1, characterized in that, The oil supply passage (11) is a rectangular annular groove opened on the outer wall surface of the support (1).

3. The high-speed bearing oil supply structure for the transmission system according to claim 2, characterized in that, The first oil passage (12) corresponds one-to-one with the second oil passage (41), and multiple passages are provided along the circumference.

4. The high-speed bearing oil supply structure for the transmission system according to claim 3, characterized in that, The first oil passage (12) coincides with the axis of the corresponding second oil passage (41).

5. The high-speed bearing oil supply structure for the transmission system according to claim 1, characterized in that, The lower end of the bevel gear (3) is connected to the support (1) via a rod bearing.

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