Turbojet engine bearing without adding lubricating oil to fuel

Abstract

The utility model discloses a turbojet engine bearing without adding lubricating oil to fuel, which comprises an outer ring, an inner ring, a retainer and a rolling body, the inner circular surface of the outer ring is provided with a raceway matched with the rolling body, the rolling body is in contact with the outer circular surface of the inner ring, and the rolling body is mounted in a pocket of the retainer in a rolling manner; a sealing ring is arranged between the same side ends of the outer ring and the inner ring, an annular groove is formed in the inner circle face of the inner ring, the inner ring is in clearance fit with a main shaft of the inner ring, a fuel centrifugal distribution cavity is defined by the inner ring and the main shaft, a plurality of through holes are evenly distributed in the inner ring in the radial direction, micropores penetrate to the outer circle face of the inner ring, and at least one oil outlet hole penetrating through a roller path of the outer ring is formed in the outer ring in the radial direction. Self-lubricating operation of the bearing is achieved, the stability of the bearing under extreme working conditions is improved, the service life of the bearing under extreme working conditions is prolonged, and the lubricating reliability under the high-temperature environment is improved.

Description

A fuel-free, oil-free turbojet engine bearing Technical Field

[0001] This utility model relates to the field of bearing technology, specifically to a turbojet engine bearing that does not require added lubricating oil. Background Technology

[0002] As the core power unit of modern aviation propulsion systems, turbojet engines operate under extreme high-temperature, high-speed, and heavy-load conditions, placing extremely high demands on the reliability of their lubrication systems. Traditional turbojet engine bearings generally use specialized lubricating oils, which are delivered to the bearing friction surfaces via an oil circuit system to reduce the coefficient of friction, minimize wear, and dissipate heat. However, existing technologies have the following problems:

[0003] Traditional lubricating oils are prone to failure in high-temperature environments. The core area of ​​a turbojet engine has a very high temperature. Under such conditions, conventional lubricating oils are prone to oxidation, cracking, or even coking, leading to a decrease in lubrication performance. In severe cases, this may cause bearing seizure or failure. The lubrication system has a complex structure and high maintenance costs. Existing lubrication systems require independent oil supply pumps, filters, coolers, and complex oil pipelines, which not only increases the overall weight and size of the engine but also increases manufacturing and maintenance costs and increases the system failure rate.

[0004] To address these issues, recent studies have attempted to use other media to replace lubricating oil, such as using fuel itself for lubrication. However, due to the high volatility, low viscosity, and poor lubrication performance of fuel, direct use in bearing lubrication still faces problems such as difficulty in forming a lubricating film and uneven lubrication.

[0005] Therefore, there is an urgent need for a turbojet engine bearing with a reasonable structure, reliable lubrication, and no need for additional lubricating oil, which can achieve fuel self-lubrication without sacrificing bearing performance, thereby improving the engine's operational stability and reliability under extreme conditions. Summary of the Invention

[0006] The technical problem to be solved by this utility model is to overcome the existing defects and provide a turbojet engine bearing that does not require additional lubricating oil. It has a reasonable structure, reliable lubrication, and does not require additional lubricating oil. It can achieve fuel self-lubrication function without sacrificing bearing performance, thereby improving the engine's operational stability and reliability under extreme conditions. It can effectively solve the problems in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a turbojet engine bearing with no added lubricating oil, comprising an outer ring, an inner ring, a cage, and rolling elements. The inner surface of the outer ring is provided with a raceway adapted to the rolling elements. The rolling elements contact the outer surface of the inner ring and are tactilely mounted in the pockets of the cage. A sealing ring is provided between the same-side ends of the outer ring and the inner ring. The inner surface of the inner ring is provided with an annular groove. The inner ring is clearance-fitted to the main shaft, and the inner ring and the main shaft form a fuel centrifugal distribution cavity. Multiple through holes are evenly distributed radially on the inner ring, and micro-holes penetrate to the outer surface of the inner ring. The outer ring is provided with at least one oil outlet hole penetrating its raceway radially.

[0008] Preferably, the surface of the rolling element has pores uniformly distributed, with pore size between 8 nanometers and 20 nanometers.

[0009] Preferably, the inner ring has a groove extending into the annular groove.

[0010] Preferably, the inner wall of the outer ring is provided with a ceramic coating.

[0011] Preferably, the sealing ring is a high-temperature resistant flexible sealing element, made of fluororubber or polytetrafluoroethylene composite material.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: by setting a fuel centrifugal distribution chamber in the inner ring, and cooperating with through holes and oil outlet holes in the outer ring, the fuel is automatically delivered to the friction contact surface during the bearing rotation process, effectively replacing the traditional lubrication oil system, simplifying the engine lubrication structure, reducing system complexity and maintenance costs, and realizing the self-lubricating operation of the bearing; the rolling element surface is provided with a nano-scale porous structure, which can adsorb fuel and release it slowly during operation, forming a stable lubricating film, avoiding the failure problem of traditional lubricating oil caused by high temperature, improving the stability and life of the bearing under extreme working conditions, and improving the lubrication reliability in high temperature environments. Attached Figure Description

[0013] Figure 1 is a schematic diagram of the structure of this utility model;

[0014] Figure 2 is a cross-sectional view of this utility model;

[0015] Figure 3 is a schematic diagram of the rolling element structure of this utility model.

[0016] In the diagram: 1 Outer ring, 1.1 Oil outlet, 2 Sealing ring, 3 Inner ring, 3.1 Groove, 3.2 Annular groove, 3.3 Through hole, 4 Rolling element, 4.1 Hole, 5 Cage. Detailed Implementation

[0017] The present invention can be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right" indicating the orientation or positional relationship, they are only corresponding to the drawings of this application for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation.

[0018] Please refer to Figures 1-3. This utility model provides the following technical solutions:

[0019] Example 1: A turbojet engine bearing without added lubricating oil includes an outer ring 1, an inner ring 3, a cage 5, and rolling elements 4. The inner surface of the outer ring 1 is provided with a raceway adapted to the rolling elements 4. The rolling elements 4 are in contact with the outer surface of the inner ring 3. The rolling elements 4 are rolled in the pocket of the cage 5. A sealing ring 2 is provided between the same side ends of the outer ring 1 and the inner ring 3. The inner surface of the inner ring 3 is provided with an annular groove 3.2. The inner ring 3 is clearance-fitted with the main shaft. The inner ring 3 and the main shaft form a fuel centrifugal distribution cavity. The inner ring 3 has a plurality of through holes 3.3 evenly distributed radially. The through holes 3.3 penetrate to the outer surface of the inner ring 3. The outer ring 1 is provided with at least one oil outlet hole 1.1 penetrating its raceway.

[0020] It is understandable that by setting an annular groove 3.2 in the inner ring 3, which cooperates with the main shaft to form a fuel centrifugal distribution chamber, and cooperating with the through hole 3.3 and oil outlet hole 1.1, during the bearing rotation process, due to the existence of centrifugal force, the fuel in the fuel centrifugal distribution chamber is automatically delivered to the friction contact surface through multiple through holes 3.3, effectively replacing the traditional lubrication oil system, simplifying the engine lubrication structure, reducing system complexity and maintenance costs, and realizing the self-lubricating operation of the bearing.

[0021] Example 2: Unlike Example 1, the surface of the rolling element 4 is uniformly distributed with pores 4.1, and the size of the pores 4.1 is between 8 nanometers and 20 nanometers. This ensures that there is enough surface area to adsorb fuel, but also prevents the pores from being too large and causing a decrease in mechanical strength.

[0022] It should be noted that a suitable base material for manufacturing the rolling element 4 (such as ceramic or high-temperature alloy) is selected, and then one or more layers of coating with nanoscale pores are created on its surface. These pores provide a large surface area. When the rolling element 4 comes into contact with fuel, fuel molecules can be physically adsorbed onto the inner wall of the pores. As the temperature rises, the fuel adsorbed in the nanopores begins to gradually evaporate. Due to the presence of nanopores, the distance between the fuel molecules and the pore walls is very short, which makes it easier for heat to be transferred to the fuel molecules, promoting their transformation from liquid to gas and eventually escaping from the pores. Alternatively, high-precision laser technology can be used to directly create the required nanopores on the surface of the rolling element 4, or an electrochemical deposition or plasma spraying method can be used to deposit a layer of material with nanopores on the surface of the rolling element.

[0023] Example 3: Unlike Example 1, the inner ring 3 is provided with a slot 3.1 extending into the annular groove 3.2, through which fuel enters the fuel centrifugal distribution chamber;

[0024] In addition, the inner wall of the outer ring 1 is coated with a ceramic coating, which not only improves the surface hardness and wear resistance, but also has good heat insulation performance, effectively reducing the impact of high temperature on the internal structure of the bearing and extending its service life; the sealing ring 2 is a high temperature resistant flexible seal made of fluororubber or polytetrafluoroethylene composite material, which has excellent high temperature resistance and corrosion resistance, effectively preventing leakage and ensuring the stability of the internal cleaning and lubrication system of the bearing.

[0025] The parts of this utility model not described in detail are prior art. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that this utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and are intended to include all changes that fall within the meaning and scope of equivalents in the content of this utility model.

Claims

1. A fuel-free turbojet engine bearing, comprising an outer ring (1), an inner ring (3), a cage (5), and rolling elements (4), characterized in that: The inner surface of the outer ring (1) is provided with a raceway adapted to the rolling element (4). The rolling element (4) contacts the outer surface of the inner ring (3). The rolling element (4) is rolled and installed in the pocket of the cage (5). A sealing ring (2) is provided between the same side ends of the outer ring (1) and the inner ring (3). The inner surface of the inner ring (3) is provided with an annular groove (3.2). The spindle of the inner ring (3) is clearance-fitted. The inner ring (3) and the spindle form a fuel centrifugal distribution cavity. The inner ring (3) has multiple through holes (3.3) evenly distributed radially. The through holes (3.3) penetrate to the outer surface of the inner ring (3). The outer ring (1) is provided with at least one oil outlet hole (1.1) that penetrates its raceway radially.

2. The turbojet engine bearing without added lubricating oil according to claim 1, characterized in that: The surface of the rolling element (4) is uniformly distributed with pores (4.1), the size of which is between 8 nanometers and 20 nanometers.

3. The turbojet engine bearing with no added lubricating oil as described in claim 1, characterized in that: The inner ring (3) is provided with a slot (3.1) extending into the annular groove (3.2).

4. The turbojet engine bearing with no added lubricating oil as described in claim 1, characterized in that: The inner wall of the outer ring (1) is provided with a ceramic coating.

5. The turbojet engine bearing with no added lubricating oil as described in claim 1, characterized in that: The sealing ring (2) is a high-temperature resistant flexible sealing element, made of fluororubber or polytetrafluoroethylene composite material.

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