High-speed bearing oil supply structure of transmission system

Abstract

The invention belongs to the field of aero-engine transmission systems, and particularly relates to a high-speed bearing oil supply structure of a transmission system. An oil supply way is formed in the outer wall face of a support, and a first oil way communicating with the oil supply way is further formed in the support. The shell is arranged on the outer side of the support in a sleeving mode, and an oil inlet is formed in the shell; the bevel gear is coaxially nested in the support, and a bearing inner ring mounting part is arranged on the bevel gear; the end cover is mounted at the upper end of the support, a second oil way is formed in the end cover, a rebound structure is further arranged on the end cover, and a bearing outer ring mounting part is arranged on the end cover; a bearing inner ring of the high-speed bearing is connected with the bearing inner ring mounting part, a bearing outer ring of the high-speed bearing is connected with the bearing outer ring mounting part, a retainer is arranged between the bearing inner ring and the bearing outer ring, and a lubricating oil cavity is jointly defined by the high-speed bearing, the end cover and the bevel gear; after lubricating oil enters the oil supply way from the oil inlet, the lubricating oil enters the lubricating oil cavity through the first oil way and the second oil way and is sprayed to the position between the bearing inner ring and the retainer along the rebound structure.

Description

Technical Field

[0001] The present application relates to the field of aero-engine transmission systems, and in particular to a high-speed bearing oil supply structure for a transmission system. Background Art

[0002] As a key component in power transmission, bearings in aircraft engine transmission systems are crucial for the stable operation of the entire engine. Their function is to support the gear shafts, withstand the loads generated by gear meshing, and transfer axial and radial loads to the transmission system's casing. The transmission system must achieve power transmission within a limited space. Existing transmission system bearing lubrication systems typically deliver lubricating oil through the casing oil circuit. A nozzle structure is installed near the bearing, directly injecting lubricating oil at a specific supply pressure. The oil ejected from this nozzle must not disperse, ensuring precise delivery to the lubrication location.

[0003] Given the trend toward high speeds, heavy loads, and compact size in transmission systems, existing bearing oil supply structures struggle to meet the high-reliability design requirements. This is particularly true for bearings in high-speed transmission systems. Existing nozzle structures, under the influence of the high-speed rotating flow field, can cause the oil jet ejected from the nozzle to be impacted and blocked, preventing it from efficiently reaching the areas requiring lubrication and cooling. This prevents frictional heat from being promptly removed by the lubricant, leading to oil starvation and high temperatures in the bearings, seriously impacting power transmission safety and even aircraft flight safety.

[0004] Therefore, it is desired to have a technical solution to overcome or at least alleviate at least one of the above-mentioned deficiencies 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 to solve the problem that when the bearing is under the influence of a high-speed rotating flow field, the lubricating oil directly injected by the existing conventional oil supply nozzle is blocked by the impact, the lubricating oil jet deviates from the theoretical oil supply position, and cannot effectively supply oil to the bearing.

[0006] The technical solution of this application is:

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

[0008] A support, wherein an oil supply passage is formed on an outer wall surface of the support, and a first oil passage is formed on the support and is connected to the oil supply passage;

[0009] a housing, the housing being sleeved on the outside of the support and having an oil inlet connected to the oil supply passage;

[0010] A bevel gear, the bevel gear being coaxially nested inside the support, and the bevel gear being provided with a bearing inner ring mounting portion;

[0011] an end cover, the end cover being mounted on the upper end of the support, the end cover being provided with a second oil passage communicating with the first oil passage, the end cover being further provided with a rebound structure corresponding to the end of the second oil passage, and the end cover being provided with a bearing outer ring mounting portion;

[0012] a high-speed bearing, wherein the inner ring of the high-speed bearing is connected to the inner ring mounting portion of the bearing, the outer ring of the bearing is connected to the outer ring mounting portion of the bearing, a retainer is provided between the inner ring of the bearing and the outer ring of the bearing, and a lubricating oil cavity is formed between the high-speed bearing, the end cover and the bevel gear;

[0013] When the lubricating oil enters the oil supply passage from the oil inlet, it passes through the first oil passage and the second oil passage in sequence, enters the lubricating oil cavity, and is sprayed along the rebound structure to between the bearing inner ring and the retaining frame.

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

[0015] In at least one embodiment of the present application, the first oil circuit corresponds to the second oil circuit one by one, and a plurality of the first oil circuits are provided along the circumferential direction.

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

[0017] In at least one embodiment of the present application, the rebound structure includes a groove and a guide slope, and the groove is aligned with the axis of the second oil circuit.

[0018] In at least one embodiment of the present 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 the transmission system of the present application can efficiently supply oil under high-speed conditions, avoid the impact and obstruction of the lubricating oil jet, reduce the impact and obstruction effect of the rotating flow field on the sprayed lubricating oil, and meet the use requirements of the engine transmission system. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0022] Figure 2 This is a schematic diagram of a rebound structure according to an embodiment of the present 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; 3-bevel gear; 4-end cover; 41-second oil line; 42-rebound structure; 421-groove; 422-guide ramp; 5-high-speed bearing. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the implementation of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below in conjunction with the drawings in the embodiments of this application. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of this application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain this application, and should not be understood as limitations on this application. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The embodiments of this application are described in detail below in conjunction with the drawings.

[0027] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and 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, be constructed and operated in a specific orientation. Therefore, it should not be understood as limiting the scope of protection of this application.

[0028] The following is combined with Figures 1 to 3 This application is described in further detail.

[0029] The transmission system high-speed bearing oil supply structure of the present application, the high-speed bearing 5 is assembled on the bevel gear 3, and at the same time bears the axial force and radial force generated by the engagement of the bevel gear 3. The magnitude and direction of the load on the high-speed bearing 5 are time-varying with 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 loads, which in turn 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] The present application provides a high-speed bearing oil supply structure for a transmission system, comprising: 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 is defined by an oil supply passage 11. The support 1 also defines a first oil passage 12 connected to the oil supply passage 11. A housing 2 is sleeved onto the outer surface of the support 1 and defines an oil inlet connected to the oil supply passage 11. A bevel gear 3 is coaxially nested within the support 1. The lower end of the bevel gear 3 is connected to the support 1 via a rod bearing. The bevel gear 3 is provided with a bearing inner ring mounting portion. An end cap 4 is mounted on the upper end of the support 1. A second oil passage 41 connected to the first oil passage 12 is defined on the end cap 4. A rebound structure 42 corresponding to the terminal end of the second oil passage 41 is also provided on the end cap 4. A bearing outer ring mounting portion is also provided on the end cap 4. The inner ring of the high-speed bearing 5 is connected to the bearing inner ring mounting portion, while the outer ring of the bearing is connected to the bearing outer ring mounting portion. A retainer is provided between the inner and outer rings of the bearings. The high-speed bearing 5, the end cap 4, and the bevel gear 3 collectively form an oil chamber.

[0032] The transmission system high-speed bearing oil supply structure of the present application, when the lubricating oil enters the oil supply path 11 from the oil inlet, passes through the first oil path 12 and the second oil path 41 in sequence, enters the lubricating oil cavity, and is sprayed along the rebound structure 42 to between the inner ring of the bearing and the retaining frame.

[0033] In a preferred embodiment of the present 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 passes through the wall of the support 1 .

[0034] In the preferred embodiment of the present application, the second oil passage 41 is an upwardly slanting oil passage with a circular cross-section and is provided on the end cap 4. It is understood that the first oil passage 12 corresponds to the second oil passage 41 in a one-to-one manner, with multiple passages of each being provided along the circumference; the axes of the first oil passage 12 and the corresponding second oil passage 41 coincide with each other.

[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 cover 4, which is located at the end of the oil circuit, wherein the groove 421 is aligned with the axis of the second oil circuit 41.

[0036] In the transmission system high-speed bearing oil supply structure of the present application, the high-speed bearing 5 is assembled on the end cover 4 and, together with the rod bearing assembled on the 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 is composed of an integrated oil circuit composed of slots and holes in the supporting stator. Compared with ordinary oil supply pipelines, this oil supply structure with an integrated oil circuit on the stator reduces the number of parts and costs on the one hand, and greatly improves the reliability and maintainability of the entire transmission device on the other hand.

[0037] The transmission system high-speed bearing oil supply structure of the present application is provided with a special rebound structure 42. The purpose is to prevent the oil from reaching groove 421, reducing its flow rate, and then spraying it along the guide bevel 422 of the rebound structure 42 to the space between the inner ring and the retaining cage of the high-speed bearing 5. The oil sprayed from the guide bevel 422 is not a conventional single cylindrical oil path. Due to the influence of the rebound structure 42, the sprayed oil takes the form of an arc-shaped strip. The high-speed operation of the high-speed bearing 5 generates a complex vortex effect, and the surfaces of rotating parts such as the high-speed bearing 5 significantly drag the airflow. Compared with a single cylindrical oil path, the arc-shaped strip oil path is less affected by the bearing's rotating flow field. Furthermore, the arc-shaped strip oil path is more conducive to entering the space between the inner ring and the retaining cage under the drag of the airflow, ensuring that the high-speed bearing 5 is fully lubricated and cooled.

[0038] The high-speed bearing oil supply structure of the transmission system disclosed in this application solves the problem of direct jet lubrication of the high-speed bearing 5, where wind resistance and eddy currents from high-speed rotation block the sprayed oil, thereby improving oil utilization. By integrating the oil supply circuit into the structural components, this not only saves on oil supply piping structure and improves economic efficiency, but also improves the reliability of the overall gear transmission device, achieving the lubrication and cooling function of the high-speed bearing 5 with a relatively small amount of structure. This application can be applied to the design of high-speed bearing oil spray lubrication and cooling for engines under development and currently in service, providing a highly reliable and sophisticated technical solution for the design of high-speed bearings in advanced aircraft engines.

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

Claims

1. A transmission system high-speed bearing oil supply structure, characterized in that: include: A support (1), wherein an oil supply passage (11) is provided on an outer wall surface of the support (1), and a first oil passage (12) communicating with the oil supply passage (11) is also provided on the support (1); A housing (2), the housing (2) being sleeved on the outside of the support (1), and the housing (2) being provided with an oil inlet communicating with the oil supply path (11); A bevel gear (3), the bevel gear (3) being coaxially nested inside the support (1), and the bevel gear (3) being provided with a bearing inner ring mounting portion; An end cover (4), the end cover (4) being mounted on the upper end of the support (1), the end cover (4) being provided with a second oil passage (41) communicating with the first oil passage (12), the end cover (4) being further provided with a rebound structure (42) corresponding to the end of the second oil passage (41), and the end cover (4) being provided with a bearing outer ring mounting portion; A high-speed bearing (5), wherein the inner ring of the high-speed bearing (5) is connected to the inner ring mounting portion of the bearing, the outer ring of the bearing is connected to the outer ring mounting portion of the bearing, a retaining frame is provided between the inner ring of the bearing and the outer ring of the bearing, and a lubricating oil cavity is formed between the high-speed bearing (5), the end cover (4) and the bevel gear (3); When the lubricating oil enters the oil supply path (11) from the oil inlet, it passes through the first oil path (12) and the second oil path (41) in sequence, enters the lubricating oil cavity, and is sprayed along the rebound structure (42) to between the bearing inner ring and the retaining frame.

2. The transmission system high-speed bearing oil supply structure 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 transmission system high-speed bearing oil supply structure according to claim 2, characterized in that: The first oil passages (12) and the second oil passages (41) correspond to each other one by one, and a plurality of the first oil passages (12) and the second oil passages (41) are arranged along the circumferential direction.

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

5. The transmission system high-speed bearing oil supply structure according to claim 4, characterized in that: The rebound structure (42) comprises a groove (421) and a guide slope (422), and the groove (421) is aligned with the axis of the second oil circuit (41).

6. The transmission system high-speed bearing oil supply structure 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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