An engine bearing pedestal and bearing bore oil return pool integrated structure

Abstract

The application belongs to the field of engine structure design, and particularly relates to an integrated structure of an engine bearing seat and a bearing cavity oil return pool. The turbine disc is provided with a front bearing mounting portion and a rear bearing mounting portion, the front bearing mounting portion is in interference fit with the outer ring of the front bearing, the rear bearing mounting portion is in interference fit with the inner ring of the rear bearing, an axial through hole is formed in the turbine disc, and the axial through hole is used for connecting the front bearing cavity and the front section of the rear bearing cavity; the rear bearing seat comprises a first rear bearing seat mounting portion and a second rear bearing seat mounting portion, the first rear bearing seat mounting portion is in interference fit with the outer ring of the rear bearing, the second rear bearing seat mounting portion is mounted on the turbine disc, a plurality of rear bearing seat oil guide holes are formed in the rear bearing seat in the axial direction, the rear bearing seat oil guide holes are used for connecting the front section of the rear bearing cavity and the rear section of the rear bearing cavity, the bottom of the rear bearing seat is provided with an oil return pool which is connected with the rear section of the rear bearing cavity, the oil return pool is provided with an oil return port, and a rear bearing seat shielding portion is arranged above the oil return pool.

Description

Technical Field

[0001] This application belongs to the field of engine structure design, and specifically relates to an integrated structure of engine bearing housing and bearing cavity oil return pool. Background Technology

[0002] The engine bearing housing is a crucial component connecting the outer ring of the main bearing to the engine's load-bearing structure, ensuring the stable operation of the engine's main bearing. The engine bearing cavity is an integrated system encompassing the engine main shaft, main bearing, oil supply nozzle, sealing device, oil return structure, and ventilation structure. After the low-temperature, clean lubricating oil cools and lubricates the bearings and other heat-generating components, it needs to be discharged from the bearing cavity in the shortest possible time and along the shortest path. Each bearing cavity has a suitable space at its bottom to store the lubricating oil to be discharged; this space is called the bearing cavity oil return sump. The main function of the bearing cavity oil return sump is to store lubricating oil for a short period and prevent airflow generated by high-speed rotating components within the bearing cavity from affecting the flow path of the lubricating oil and gas. The rationality of the oil return sump structure is a key factor in ensuring the smooth discharge of the lubricating oil and gas medium from the bearing cavity.

[0003] Currently, in some engine bearing cavity designs, the bearing housing and the oil return sump are independent structures with no functional relationship. This has the following drawbacks: the oil return sump structure cannot effectively slow down the high-speed moving lubricating oil-gas medium, which is detrimental to lubricating oil return; the position of the oil return port in the oil return sump is inappropriate, which is also detrimental to lubricating oil return.

[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 an integrated structure of engine bearing housing and bearing cavity oil return pool to solve at least one problem existing in the prior art.

[0006] The technical solution of this application is:

[0007] An integrated structure of an engine bearing housing and bearing cavity oil return sump includes: a turbine disk and a rear bearing housing, wherein the front side of the turbine disk forms a front bearing cavity, a front section of the rear bearing cavity is formed between the turbine disk and the rear bearing housing, and a rear section of the rear bearing cavity is formed inside the rear bearing housing.

[0008] The turbine disk is provided with a front bearing mounting part and a rear bearing mounting part. The front bearing mounting part is interference-fitted with the outer ring of the front bearing, and the rear bearing mounting part is interference-fitted with the inner ring of the rear bearing. The turbine disk is provided with an axial through hole, which is used to connect the front bearing cavity and the front section of the rear bearing cavity.

[0009] The rear bearing housing includes a first rear bearing housing mounting part and a second rear bearing housing mounting part. The first rear bearing housing mounting part is interference-fitted with the outer ring of the rear bearing. The second rear bearing housing mounting part is mounted on the turbine disk. The rear bearing housing has a plurality of rear bearing housing oil guide holes along the axial direction. The rear bearing housing oil guide holes are used to connect the front section of the rear bearing cavity with the rear section of the rear bearing cavity. The bottom of the rear bearing housing is provided with an oil return pool communicating with the rear section of the rear bearing cavity. The oil return pool has an oil return port. A rear bearing housing shielding part is provided above the oil return pool.

[0010] In at least one embodiment of this application, a shaft is further included, which is interference-fitted with the inner ring of the front bearing, and the shaft rotates in the opposite direction to the turbine disk.

[0011] In at least one embodiment of this application, the oil return port is located at the middle position of the bottom of the oil return pool.

[0012] In at least one embodiment of this application, an oil return pipe is installed at the oil return port of the oil return pool.

[0013] In at least one embodiment of this application, a vertical wall is provided in the return oil pool in the direction opposite to the rotational speed.

[0014] In at least one embodiment of this application, the rear bearing housing shield completely blocks the oil return port of the oil return pool.

[0015] In at least one embodiment of this application, the rear bearing housing, the oil return pipe, and the rear bearing housing shield are integrally cast parts.

[0016] In at least one embodiment of this application, the rear bearing housing oil guide hole is a waist-shaped hole.

[0017] The invention has at least the following beneficial technical effects:

[0018] The integrated structure of the engine bearing housing and bearing cavity oil return pool in this application can effectively reduce the flow rate of the high-speed rotating oil and gas medium entering the bearing cavity oil return pool, making the flow field in the oil return pool simple and regular, improving the oil return effect, and preventing abnormal leakage of engine lubricating oil in the bearing cavity. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of an integrated structure of an engine bearing housing and bearing cavity oil return sump according to one embodiment of this application;

[0020] Figure 2 This is a schematic diagram of the oil return tank structure according to one embodiment of this application.

[0021] in:

[0022] 1-Shaft; 2-Front bearing; 3-Turbine disk; 4-Rear bearing; 5-First rear bearing housing mounting part; 6-Sealing structure; 7-Second rear bearing housing mounting part; 8-Oil return pool; 9-Oil return pipe; 10-Rear bearing housing shielding part; 11-Rear bearing housing oil guide hole. Detailed Implementation

[0023] 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.

[0024] 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.

[0025] The following is in conjunction with the appendix Figures 1 to 2 This application will be described in further detail.

[0026] This application provides an integrated structure of engine bearing housing and bearing cavity oil return pool, including: turbine disk 3 and rear bearing housing, the front side of turbine disk 3 forms a front bearing cavity ①, the turbine disk 3 and the rear bearing housing form a front section ② of the rear bearing cavity, and the rear bearing housing forms a rear section ③ inside the rear bearing housing.

[0027] Specifically, the turbine disk 3 is provided with a front bearing mounting part and a rear bearing mounting part. The front bearing mounting part is interference-fitted with the outer ring of the front bearing 2, and the rear bearing mounting part is interference-fitted with the inner ring of the rear bearing 4. An axial through hole is opened in the middle of the turbine disk 3 to ensure communication between the front bearing cavity ① and the front section ② of the rear bearing cavity. The rear bearing housing includes a first rear bearing housing mounting part 5 and a second rear bearing housing mounting part 7. The first rear bearing housing mounting part 5 is interference-fitted with the outer ring of the rear bearing 4, and the second rear bearing housing mounting part 7 is mounted on the turbine disk 3 with a connecting piece and a seal. Multiple rear bearing housing oil guide holes 11 are evenly distributed circumferentially at the large diameter of the rear bearing housing and are opened axially. The rear bearing housing oil guide holes 11 are used to connect the front section ② of the rear bearing cavity and the rear section ③ of the rear bearing cavity. An oil return pool 8 communicating with the rear section of the rear bearing cavity is provided at the bottom of the rear bearing housing. The oil return pool 8 has an oil return port, and a rear bearing housing shielding part 10 is provided above the oil return pool 8. When the turbine disk 3 rotates, a certain flow is formed in the front section ② and the rear section ③ of the rear bearing cavity, causing the oil and gas medium in the front section ② and the rear section ③ of the rear bearing cavity to rotate at high speed.

[0028] The integrated structure of the engine bearing housing and bearing cavity oil return sump of this application also includes a shaft 1. The shaft 1 is interference-fitted with the inner ring of the front bearing 2, and the shaft 1 rotates in the opposite direction to the turbine disk 3, which can form a complex oil and gas flow in the front bearing cavity ①. A sealing structure 6 is provided between the portion of the shaft 1 located in the front section ② of the rear bearing cavity and the rear bearing housing.

[0029] In a preferred embodiment of this application, the oil return port is located at the middle position of the bottom of the oil return tank 8, and an oil return pipe 9 is installed at the oil return port of the oil return tank 8.

[0030] Advantageously, in this embodiment, the oil return tank 8 is as follows: Figure 2 The structure shown is similar to a square, with a vertical wall in the oil return tank 8 in the direction opposite to the rotation speed, and a flat bottom.

[0031] Advantageously, in this embodiment, the rear bearing housing blocking part 10 forms a barrier above the oil return pool 8, and the rear bearing housing blocking part 10 completely blocks the oil return port of the oil return pool 8.

[0032] In a preferred embodiment of this application, the rear bearing housing, the oil return pipe 9, and the rear bearing housing shielding part 10 are integrally cast parts.

[0033] Advantageously, in this embodiment, the oil guide hole 11 of the rear bearing housing is a waist-shaped hole.

[0034] The integrated structure of the engine bearing housing and bearing cavity oil return sump in this application describes the flow process of the oil-gas medium as follows: The lubricating oil-gas mixture that has completed cooling and lubrication in the bearing cavity enters the oil return sump 8 through paths A and B, respectively. The lubricating oil-gas medium flowing along path A flows backward through the rear bearing housing oil guide hole 11 on the rear bearing housing, passes through the rear bearing housing shielding structure 10 at the bottom of the rear bearing housing, and then bends in the opposite direction to enter the oil return sump 8. The lubricating oil-gas medium flowing along path B directly enters the rear section ③ of the rear bearing cavity and flows downward, mixing with the lubricating oil-gas medium from path A before entering the oil return sump 8. Driven by the rotating component shaft 1 and turbine disk 3, the lubricating oil-gas medium has a high tangential velocity in the circumferential direction when it enters the return oil pool 8. After entering the return oil pool 8, the lubricating oil-gas collide with the windward wall on the right side of the return oil pool, forming a vortex. Most of the oil-gas medium has a reduced flow velocity and is discharged from the bearing cavity through the return oil pipe 9. The lubricating oil-gas that is not discharged by the return oil port collides with the front wall again in the square return oil pool 8, and the flow velocity is further reduced before entering the return oil port and being discharged from the bearing cavity.

[0035] The integrated structure of the engine bearing housing and bearing cavity oil return sump of this application effectively reduces the flow velocity of the high-speed rotating oil-gas medium entering the bearing cavity oil return sump, making the flow field in the oil return sump simple and regular, resulting in better oil return and preventing abnormal leakage of engine lubricating oil in the bearing cavity. The location of the oil return port effectively facilitates the smooth discharge of lubricating oil-gas medium from the bearing cavity, preventing its accumulation in the oil return sump.

[0036] 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. An integrated structure of engine bearing housing and bearing cavity oil return sump, characterized in that, include: The turbine disk (3) and the rear bearing housing are provided. A front bearing cavity is formed on the front side of the turbine disk (3). A front section of the rear bearing cavity is formed between the turbine disk (3) and the rear bearing housing. A rear section of the rear bearing cavity is formed inside the rear bearing housing. The turbine disk (3) is provided with a front bearing mounting part and a rear bearing mounting part. The front bearing mounting part is interference-fitted with the outer ring of the front bearing (2), and the rear bearing mounting part is interference-fitted with the inner ring of the rear bearing (4). The turbine disk (3) is provided with an axial through hole, which is used to connect the front bearing cavity and the front section of the rear bearing cavity. The rear bearing housing includes a first rear bearing housing mounting part (5) and a second rear bearing housing mounting part (7). The first rear bearing housing mounting part (5) is interference-fitted with the outer ring of the rear bearing (4). The second rear bearing housing mounting part (7) is mounted on the turbine disk (3). The rear bearing housing has a plurality of rear bearing housing oil guide holes (11) along the axial direction. The rear bearing housing oil guide holes (11) are used to connect the front section of the rear bearing cavity with the rear section of the rear bearing cavity. The bottom of the rear bearing housing is provided with an oil return pool (8) that communicates with the rear section of the rear bearing cavity. The oil return pool (8) has an oil return port. The top of the oil return pool (8) is provided with a rear bearing housing shielding part (10).

2. The integrated structure of engine bearing housing and bearing cavity oil return sump according to claim 1, characterized in that, It also includes a shaft (1) that is interference-fitted with the inner ring of the front bearing (2) and the shaft (1) rotates in the opposite direction to the turbine disk (3).

3. The integrated structure of engine bearing housing and bearing cavity oil return sump according to claim 2, characterized in that, The return oil port is located at the middle position of the bottom of the return oil pool (8).

4. The integrated structure of engine bearing housing and bearing cavity oil return sump according to claim 3, characterized in that, The return oil tank (8) is equipped with a return oil pipe (9) at the return oil port.

5. The integrated structure of engine bearing housing and bearing cavity oil return sump according to claim 4, characterized in that, The oil return pool (8) has a vertical wall in the direction opposite to the rotation speed.

6. The integrated structure of engine bearing housing and bearing cavity oil return sump according to claim 5, characterized in that, The rear bearing housing shield (10) completely blocks the oil return port of the oil return pool (8).

7. The integrated structure of engine bearing housing and bearing cavity oil return sump according to claim 6, characterized in that, The rear bearing housing, the oil return pipe (9), and the rear bearing housing shielding part (10) are integrally cast parts.

8. The integrated structure of engine bearing housing and bearing cavity oil return sump according to claim 7, characterized in that, The oil guide hole (11) of the rear bearing housing is a waist-shaped hole.

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