Thermal barrier bearing sleeve for a turbocharger

Abstract

This utility model relates to the field of heat-insulating bearing sleeve technology, specifically a heat-insulating bearing sleeve for a turbocharger, including a bearing sleeve body in the shape of a ring. A heat-insulating layer made of ceramic fiber is installed on one side of the inner wall of the bearing sleeve body. This utility model effectively blocks the large amount of heat generated during turbocharger operation from being transferred to the bearing sleeve through the ceramic fiber heat-insulating layer on the inner wall, preventing damage to bearings and other components due to high temperatures. The nickel-based alloy transition layer between the heat-insulating layer and the bearing sleeve body enhances the bonding strength between the two, ensuring that the heat-insulating layer is not easily detached under long-term high-temperature conditions. Simultaneously, the annular heat dissipation fins on the outer wall of the bearing sleeve body increase the contact area with air, accelerating heat dissipation, and several pressure relief holes can promptly release internal pressure caused by temperature changes, further improving the stability of the bearing sleeve under high-temperature conditions.

Description

Technical Field

[0001] This utility model relates to the field of heat-insulating bearing sleeve technology, and in particular to a heat-insulating bearing sleeve for a turbocharger. Background Technology

[0002] Turbochargers, as key components for improving engine performance, are widely used in modern automobiles and industrial power systems. Their working principle involves using the high-temperature, high-pressure exhaust gas from the engine to drive a turbine, which in turn drives a coaxial impeller to compress air, increasing the engine's intake air volume, enhancing combustion efficiency, and ultimately increasing the engine's output power. However, during operation, the turbine end of a turbocharger generates extremely high temperatures. If a large amount of this heat is transferred to the bearings, it can have many adverse effects on the bearings and related components. On the one hand, high temperatures accelerate the aging and deterioration of the lubricating oil, reducing its lubrication performance, increasing bearing wear, and even causing bearing seizure, severely impacting the turbocharger's lifespan. On the other hand, excessively high temperatures can also cause thermal deformation of the bearings and surrounding components, compromising the fit between components, affecting the normal operation of the turbocharger, and reducing its efficiency.

[0003] Some technologies employ water-cooled bearing systems, where engine coolant circulates within the bearing housing, drawing heat from the housing into the engine cooling system to reduce the bearing temperature. However, casting this water-cooled bearing housing requires multiple inner cores, complicating the casting process and significantly increasing costs. Furthermore, the coolant's heat absorption process reduces the total heat energy available to the turbine impeller, negatively impacting the turbocharger's power output. While some technologies mitigate heat radiation by installing heat insulation sleeves at the turbine housing and bearing body connection, this increases the number of parts, mold investment, and assembly requirements, raising costs, reducing assembly efficiency, and increasing parts management expenses.

[0004] Therefore, we propose a heat-insulating bearing sleeve for turbochargers. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a heat-insulating bearing sleeve for turbochargers.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A heat-insulating bearing sleeve for a turbocharger includes a bearing sleeve body in the shape of a ring. A heat-insulating layer is installed on one side of the inner wall of the bearing sleeve body. The heat-insulating layer is made of ceramic fiber and is tightly bonded to one side of the inner wall of the bearing sleeve body by a high-temperature resistant adhesive.

[0008] As a further embodiment of this utility model: a pressure relief hole is uniformly opened on one side of the bearing sleeve body along the circumferential direction, and a plurality of pressure relief holes are opened, and the pressure relief holes penetrate the bearing sleeve body.

[0009] As a further improvement of this utility model: heat dissipation fins are installed on one side of the outer wall of the bearing sleeve body, and several groups of heat dissipation fins are arranged in a ring along the bearing sleeve body.

[0010] As a further improvement of this utility model: a sealing ring is provided at one end of the bearing sleeve body, and the sealing ring is tightly fitted at the connection of the bearing sleeve body.

[0011] As a further improvement of this utility model: the sealing ring is made of polytetrafluoroethylene material, and an annular groove is formed on one side of the inner wall of the sealing ring, and the annular groove is provided in several ways.

[0012] As a further embodiment of this utility model: a transition layer is provided between one side of the inner wall of the bearing sleeve body and the heat insulation layer, and the transition layer is a nickel-based alloy layer.

[0013] Compared with the prior art, the present invention provides a heat-insulating bearing sleeve for a turbocharger, which has the following advantages:

[0014] 1. This utility model, through the ceramic fiber heat insulation layer set on the inner wall, can effectively block the large amount of heat generated during the operation of the turbocharger from being transferred to the inside of the bearing sleeve, thus preventing damage to the bearing and other components due to high temperature. The nickel-based alloy transition layer between the heat insulation layer and the bearing sleeve body can enhance the bonding strength between the two, ensuring that the heat insulation layer is not easy to fall off under long-term high temperature environment. At the same time, the annular heat dissipation fins on the outer wall of the bearing sleeve body can increase the contact area with air, accelerate heat dissipation, and several pressure relief holes can also release the internal pressure caused by temperature changes in a timely manner, further improving the stability of the bearing sleeve under high temperature conditions.

[0015] 2. This utility model utilizes a sealing ring made of polytetrafluoroethylene (PTFE), which possesses excellent high-temperature resistance and corrosion resistance. Several annular grooves on its inner wall enhance the sealing at the connection point with the bearing sleeve body, effectively preventing lubricant leakage or the entry of external impurities. Furthermore, the sealing ring is tightly fitted at the connection point of the bearing sleeve body, complementing the structural design of the bearing sleeve body. Combined with evenly distributed heat dissipation fins and pressure relief holes, this results in a more uniform stress distribution and higher structural stability during operation of the entire bearing sleeve. It can withstand the vibration and pressure of turbocharger operation for extended periods, thereby extending its service life.

[0016] The parts of this device not covered herein are the same as or can be implemented using existing technologies. This utility model has a simple structure and is easy to operate. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a heat-insulating bearing sleeve for a turbocharger proposed in this utility model;

[0018] Figure 2 This is a top view cross-sectional structural diagram of a heat-insulating bearing sleeve for a turbocharger proposed in this utility model;

[0019] Figure 3 This is a schematic diagram of the overall structure of the heat-insulating bearing sleeve body of a turbocharger proposed in this utility model;

[0020] Figure 4 This is a schematic diagram of the overall structure of the heat-insulating bearing sleeve sealing ring of a turbocharger proposed in this utility model.

[0021] In the diagram: 1. Bearing sleeve body; 2. Heat insulation layer; 3. Pressure relief hole; 4. Heat dissipation fins; 5. Sealing ring; 6. Annular groove; 7. Transition layer. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "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 utility model 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 limitations on this utility model.

[0024] Example: A heat-insulating bearing sleeve for a turbocharger, such as Figures 1-4 As shown, the bearing sleeve body 1 is ring-shaped. A heat insulation layer 2 is installed on one side of the inner wall of the bearing sleeve body 1. The heat insulation layer 2 is made of ceramic fiber and is tightly bonded to the inner wall of the bearing sleeve body 1 by a high-temperature resistant adhesive. The ceramic fiber heat insulation layer 2 installed on the inner wall can effectively block the large amount of heat generated by the turbocharger during operation from being transferred to the inside of the bearing sleeve, thus preventing the bearing and other components from being damaged by high temperature.

[0025] like Figures 1-4As shown, a number of pressure relief holes 3 are evenly distributed along the circumference on one side of the bearing sleeve body 1, and the pressure relief holes 3 penetrate the bearing sleeve body 1. When the turbocharger is working, the internal temperature will change drastically, which will cause the internal pressure of the bearing sleeve to rise. The pressure relief holes 3 evenly distributed can release the high pressure gas generated by the temperature change in time, so as to keep the internal pressure of the bearing sleeve balanced with the external pressure, prevent the bearing sleeve body 1 from being deformed due to excessive pressure, and thus improve the stability and safety of the bearing sleeve structure.

[0026] like Figures 1-4 As shown, a heat dissipation fin 4 is installed on one side of the outer wall of the bearing sleeve body 1, and several groups of heat dissipation fins 4 are arranged in a ring along the bearing sleeve body 1. The ring heat dissipation fins 4 on the outer wall of the bearing sleeve body 1 can increase the contact area with the air, accelerate heat dissipation, and improve heat dissipation efficiency.

[0027] like Figures 1-4 As shown, a sealing ring 5 is provided at one end of the bearing sleeve body 1. The sealing ring 5 is tightly fitted at the connection of the bearing sleeve body 1. The sealing ring 5 can prevent the lubricating oil inside the turbocharger from leaking from the connection. At the same time, it can also prevent external dust, water vapor and other impurities from entering the bearing sleeve and affecting its operation, thereby maintaining the stable working state of the turbocharger.

[0028] like Figures 1-4 As shown, the sealing ring 5 is made of polytetrafluoroethylene (PTFE). An annular groove 6 is provided on one side of the inner wall of the sealing ring 5. Several annular grooves 6 are provided. By using PTFE material, the sealing ring 5 itself has good high temperature resistance and corrosion resistance, thus extending its service life.

[0029] like Figures 1-4 As shown, a transition layer 7 is provided between one side of the inner wall of the bearing sleeve body 1 and the heat insulation layer 2. The transition layer 7 is a nickel-based alloy layer. The nickel-based alloy transition layer 7 provided between the heat insulation layer 2 and the bearing sleeve body 1 enhances the strength of both, ensuring that the heat insulation layer 2 is not easy to fall off under long-term high temperature environment.

[0030] Working Principle: During use, the ceramic fiber insulation layer 2 on the inner wall effectively prevents the large amount of heat generated by the turbocharger during operation from being transferred to the bearing sleeve, avoiding damage to bearings and other components due to high temperatures. The nickel-based alloy transition layer 7 between the insulation layer 2 and the bearing sleeve body 1 enhances the bonding strength between the two, ensuring that the insulation layer 2 is not easily detached under long-term high-temperature environments. At the same time, the annular heat dissipation fins 4 on the outer wall of the bearing sleeve body 1 increase the contact area with air, accelerating heat dissipation. Several pressure relief holes 3 can also promptly release the internal pressure generated by temperature changes, further improving the bearing sleeve's performance under high-temperature conditions. The stability is achieved through the use of a sealing ring 5 made of polytetrafluoroethylene (PTFE), which itself possesses excellent high-temperature resistance and corrosion resistance. Several annular grooves 6 on its inner wall enhance the sealing performance at the connection with the bearing sleeve body 1, effectively preventing lubricating oil leakage or the entry of external impurities. Moreover, the sealing ring 5 is tightly fitted at the connection of the bearing sleeve body 1, which is compatible with the structural design of the bearing sleeve body 1. Combined with the evenly distributed heat dissipation fins 4 and pressure relief holes 3, the entire bearing sleeve is subjected to more uniform stress during operation, resulting in higher structural stability. It can withstand the vibration and pressure of the turbocharger during long-term operation, thereby extending its service life.

[0031] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A turbocharger bearing housing comprising a bearing housing body (1), characterized in that The bearing sleeve body (1) is ring-shaped. A heat insulation layer (2) is installed on one side of the inner wall of the bearing sleeve body (1). The heat insulation layer (2) is made of ceramic fiber and is tightly attached to one side of the inner wall of the bearing sleeve body (1) by a high-temperature resistant adhesive.

2. A turbocharger bearing housing as in claim 1 wherein The bearing sleeve body (1) has pressure relief holes (3) evenly distributed along the circumferential direction on one side. Several pressure relief holes (3) are provided and penetrate the bearing sleeve body (1).

3. The turbocharger bearing housing as defined in claim 1 wherein The bearing sleeve body (1) is provided with heat dissipation fins (4) on one side of its outer wall, and the heat dissipation fins (4) are arranged in a ring along the bearing sleeve body (1) in several groups.

4. The turbocharger bearing housing as defined in claim 1 wherein A sealing ring (5) is provided at one end of the bearing sleeve body (1), and the sealing ring (5) is tightly fitted at the connection of the bearing sleeve body (1).

5. A turbocharger bearing housing as in claim 4 wherein The sealing ring (5) is made of polytetrafluoroethylene material. An annular groove (6) is provided on one side of the inner wall of the sealing ring (5). The annular groove (6) has several openings.

6. The turbocharger bearing housing of claim 1 wherein A transition layer (7) is provided between one side of the inner wall of the bearing sleeve body (1) and the heat insulation layer (2), and the transition layer (7) is a nickel-based alloy layer.

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