Split bearing body for an electrically assisted supercharger

Abstract

The application provides a split bearing body for an electrically assisted supercharger, which comprises a main bearing body and a pressure end bearing seat in a split structure; the main bearing body is internally provided with a containing cavity for containing an electric motor, the electric motor is arranged between a vortex end and a pressure end bearing, and the electric motor is coaxially connected with a turbine and a compressor of the electrically assisted supercharger; the oil cavity seal between the main bearing body and the pressure end bearing seat is sealed by a first sealing piece; and the oil inlet pipeline between the main bearing body and the pressure end bearing seat is sealed by a second sealing piece. The split bearing body for the electrically assisted supercharger adopts the main bearing body and the pressure end bearing seat in the split structure, combines the electric motor and the turbocharging system, and can greatly improve the hysteresis effect of the turbine and improve the dynamic response of the engine.

Description

Technical Field

[0001] This application belongs to the field of engine supercharging technology, and particularly relates to a split bearing body for an electric auxiliary supercharger. Background Technology

[0002] Traditional engine turbochargers primarily rely on exhaust gases to directly drive a turbine, which in turn rotates a compressor impeller to compress air into the engine's intake manifold, thus achieving a boost effect. Turbocharging significantly improves engine power density and efficiency, but it also has some drawbacks: during engine acceleration, the turbocharger exhibits "turbo lag" due to the turbine rotor's inertia; the boost required by the engine varies under different operating conditions, and turbochargers struggle to adjust for these variations, especially under low and high engine operating conditions, where underboost or overboost may occur. Therefore, improving the turbocharger's operational regulation performance is crucial for enhancing engine performance.

[0003] To improve the turbocharger's turbine lag effect and enhance its variable operating condition regulation characteristics, electric auxiliary supercharging is an effective method. Many studies and patents have investigated electric auxiliary supercharging, but the arrangement of the auxiliary motor varies. Patents CN115419504A and CN115539197A employ a non-coaxial external motor electric auxiliary supercharging method, connecting the turbine to a generator and the compressor to an electric motor, respectively, achieving flexible supercharging control. Patent CN115853813A proposes a motor-detachable electric auxiliary supercharging device, which uses a clutch to connect and disconnect the motor from the supercharger. Patent CN112709629A proposes an externally mounted electric auxiliary supercharger, coaxially connecting the motor to the compressor intake side to achieve auxiliary supercharging.

[0004] In summary, although many research and inventions have achieved motor-assisted boosting, most of these methods have greatly increased the size and weight of the system and made it difficult to guarantee the stable operation of the rotor system. Summary of the Invention

[0005] In view of this, this application aims to propose a split bearing housing for an electrically assisted turbocharger to solve the problem of turbo lag caused by the inertia of the turbine rotor during engine acceleration, which leads to unstable turbocharger performance.

[0006] To achieve the above objectives, the technical solution of this application is implemented as follows:

[0007] This application provides a split bearing housing for an electric auxiliary turbocharger, the bearing housing comprising a main bearing housing and a pressure end bearing housing in a split structure;

[0008] The main bearing body is provided with a housing cavity for accommodating the motor. The motor is located between the vortex end and the pressure end bearings, and the motor is coaxially connected to the turbine and compressor of the electric auxiliary turbocharger.

[0009] The oil inlet pipe between the main bearing body and the pressure end bearing seat is sealed by a first sealing element;

[0010] The oil cavity between the main bearing body and the pressure end bearing seat is sealed by a second sealing element.

[0011] Furthermore, the main bearing body and the pressure end bearing seat are provided with matching connecting end faces, and are detachably connected by positioning connectors;

[0012] The main bearing body and the pressure end bearing seat are each provided with corresponding positioning connection holes, and the positioning pin passes through the positioning connection holes to position the main bearing body and the pressure end bearing seat.

[0013] The main bearing body and the pressure end bearing seat are provided with fixing holes, and fastening bolts pass through the fixing holes to fix the main bearing body and the pressure end bearing seat together.

[0014] Furthermore, each of the oil inlet pipe connections between the main bearing housing and the pressure end bearing seat is provided with an oil seal groove;

[0015] The first seal is disposed within the oil seal groove.

[0016] Furthermore, the first sealing element is a copper oil seal gasket.

[0017] Furthermore, the main bearing body is provided with an assembly hole, the pressure end bearing seat is provided with an assembly shaft corresponding to the assembly hole provided on the main bearing body, and the assembly shaft is provided with a sealing groove;

[0018] The second seal is assembled into the sealing groove.

[0019] Furthermore, the second seal is an O-ring.

[0020] Compared with the prior art, the split bearing housing for an electric auxiliary turbocharger described in this application has the following advantages:

[0021] The split bearing housing for an electrically assisted turbocharger described in this application connects the turbine, motor, and compressor coaxially by setting a split main bearing housing and a pressure end bearing housing, and placing the motor between the turbine end and the pressure end bearing, making the turbocharger structure more compact and efficient, effectively improving the turbocharger turbine hysteresis effect, and enhancing the turbocharger's regulation characteristics. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0023] Figure 1 This is a cross-sectional view of the split bearing assembly described in the embodiments of this application;

[0024] Figure 2 This is a schematic diagram of the connecting surface structure of the split bearing body as described in the embodiment of this application.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1-Main bearing housing; 2-Pressure end bearing seat; 3-First seal; 4-Second seal; 5-Positioning pin; 6-Fasting bolt. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0028] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0029] Please see Figure 1 As shown, this embodiment provides a split bearing housing for an electric auxiliary turbocharger, the bearing housing comprising a main bearing housing and a pressure end bearing housing that are split into two parts;

[0030] The main bearing housing is provided with a cavity for accommodating the motor. The motor is located between the vortex end and pressure end bearings, and the motor is coaxially connected to the turbine and compressor of the electric auxiliary turbocharger.

[0031] The oil inlet pipe between the main bearing housing and the pressure end bearing housing is sealed by the first sealing element;

[0032] The oil cavity between the main bearing housing and the pressure end bearing housing is sealed by a second sealing element.

[0033] Specifically, to position the motor between the vortex end and pressure end bearing housings, the bearing housing adopts a separate design for the main bearing housing and the pressure end bearing housing, ensuring that the motor can be installed inside the bearing housing during assembly. The main bearing housing contains the bearing housing, motor stator fixing surface, and motor wiring, while the pressure end bearing housing contains only one bearing housing, serving to fix the bearing and encapsulate the motor. These structures are inherent to the bearing housing; no modifications are made to the other components of the turbocharger system, and will not be elaborated upon further. The bearing housing described in this embodiment is highly portable; only the dimensions of the bearing housing need to be changed on the existing turbocharger, while other parts of the turbocharger can remain largely unchanged or undergo minor adjustments to some component dimensions.

[0034] Furthermore, in this embodiment, the bearing housing adopts a motor-centric design, with the motor installed between two bearing seats. This shortens the axial length of the turbocharger rotor, making the turbocharger system layout more compact and lightweight, and ensuring stable system operation.

[0035] The split bearing housing for an electrically assisted turbocharger described in this embodiment connects the turbine, motor, and compressor coaxially by setting a split main bearing housing and a pressure end bearing housing. The motor is placed between the turbine end and the pressure end bearing, making the turbocharger structure more compact and efficient. This effectively improves the turbocharger's turbine hysteresis effect and enhances its regulation characteristics.

[0036] In some implementations, such as Figure 2 As shown, the main bearing body and the pressure end bearing seat are provided with matching connecting end faces and are detachably connected by positioning connectors.

[0037] The main bearing body and the pressure end bearing housing are each provided with corresponding positioning connection holes. The positioning pin passes through the positioning connection holes to position the main bearing body and the pressure end bearing housing.

[0038] The main bearing housing and the pressure end bearing seat are provided with fixing holes, and the fastening bolts pass through the fixing holes to fix the main bearing housing and the pressure end bearing seat.

[0039] Specifically, in this embodiment, the main bearing body and the pressure end bearing seat are connected by a number of fastening bolts. Alternatively, a clamp can be designed to connect the two, as long as the two are fixedly connected. Further details will not be provided here. Therefore, the main bearing body and the pressure end bearing seat should be designed with mating end faces to ensure a good connection. In addition, in order to ensure assembly accuracy, the main bearing body and the pressure end bearing seat need to be machined with positioning pin holes, and the two are positioned by a number of positioning pins.

[0040] In some embodiments, an oil seal groove is provided at the connection point of the oil inlet pipe between the main bearing body and the pressure end bearing housing;

[0041] The first sealing element is set inside the oil seal groove, and the first sealing element is a copper oil seal gasket.

[0042] Specifically, in this embodiment, the connection between the oil inlet pipe between the main bearing body and the pressure end bearing housing is sealed by an oil seal gasket. The oil seal gasket can prevent lubricating oil from leaking out under high pressure oil inlet conditions, thus achieving good oil circuit connection between the main bearing body and the pressure end bearing housing.

[0043] In some embodiments, the main bearing body is provided with an assembly hole, the pressure end bearing seat is provided with an assembly shaft corresponding to the assembly hole provided on the main bearing body, and the assembly shaft is provided with a sealing groove.

[0044] The second sealing element is assembled into the sealing groove. The second sealing element is an O-ring.

[0045] Specifically, the oil cavity seal between the main bearing housing and the pressure end bearing housing is achieved through an O-ring seal, and the installation of the O-ring is not limited to... Figure 1 The position shown should be maintained, but in any case, the main bearing housing and the pressure end bearing housing should be tightly pressed and well sealed.

[0046] In practice:

[0047] a. The bearing housing adopts a split structure, the structure of which is as follows: Figure 1 and Figure 2 As shown, it mainly includes the main bearing body, the pressure end bearing housing, the oil seal gasket, the O-ring, the locating pin, and the fastening bolts.

[0048] b. The main bearing housing has a motor mounting surface inside for placing the motor. After the motor is installed, it will cooperate with the pressure end bearing housing. The main bearing housing is set as a mounting hole, and the pressure end bearing housing is set as a mounting shaft. A sealing groove is provided on the mounting shaft of the pressure end bearing housing to place the O-ring seal. Oil seal grooves are provided at the connection of the oil inlet pipe between the main bearing housing and the pressure end bearing housing. During assembly, the seal is tightened by deformable copper washers.

[0049] c. To ensure the assembly accuracy of the main bearing housing and the pressure end bearing seat, two positioning holes are first drilled and tapered pins are installed for assembly. After the motor is installed, tapered pins are inserted for positioning, and fastening bolts are installed to ensure a tight connection between the main bearing housing and the pressure end bearing seat.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

[0051] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A split-type bearing housing for an electric auxiliary turbocharger, characterized in that: The bearing housing includes a main bearing housing and a pressure end bearing housing, which are in a split structure. The main bearing body is provided with a housing cavity for accommodating the motor. The motor is located between the vortex end and the pressure end bearings, and the motor is coaxially connected to the turbine and compressor of the electric auxiliary turbocharger. The oil inlet pipe between the main bearing body and the pressure end bearing seat is sealed by a first sealing element; The oil cavity between the main bearing body and the pressure end bearing seat is sealed by a second sealing element; The main bearing body and the pressure end bearing seat are provided with matching connection end faces and are detachably connected by positioning connectors. Each of the oil inlet pipe connections between the main bearing body and the pressure end bearing seat is provided with an oil seal groove. The first sealing element is disposed within the oil seal groove; The main bearing body is provided with an assembly hole, and the pressure end bearing seat is provided with an assembly shaft corresponding to the assembly hole provided on the main bearing body, and the assembly shaft is provided with a sealing groove. The second seal is assembled into the sealing groove.

2. A split bearing housing for an electric auxiliary turbocharger according to claim 1, characterized in that: The main bearing body and the pressure end bearing seat are each provided with corresponding positioning connection holes, and the positioning pin passes through the positioning connection holes to position the main bearing body and the pressure end bearing seat. The main bearing body and the pressure end bearing seat are provided with fixing holes, and fastening bolts pass through the fixing holes to fix the main bearing body and the pressure end bearing seat together.

3. A split bearing housing for an electric auxiliary turbocharger according to claim 1, characterized in that: The first sealing element is a copper oil seal gasket.

4. A split bearing housing for an electric auxiliary turbocharger according to claim 1, characterized in that: The second sealing element is an O-ring.

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