An electrically assisted supercharger rotor oil throw cooling structure

Abstract

The application relates to an oil throwing and cooling structure of an electric auxiliary supercharger rotor, belonging to the technical field of electric auxiliary superchargers, which comprises an oil supply base integrated on a bearing body and an oil throwing structure of a rotor system composed of a turbine rotating shaft, a motor rotor and a thrust spacer sleeve, an oil throwing cavity is arranged in the turbine rotating shaft, and oil inlet holes and oil outlet holes are arranged at two ends of the turbine rotating shaft; an oil outlet channel is arranged on the motor rotor and is correspondingly assembled with the oil outlet holes to form an oil throwing channel; a pressure oil cavity corresponding to the oil inlet holes is arranged on the thrust spacer sleeve, the radial cross section of the pressure oil cavity is wide at the outside and narrow at the inside, and the included angle between the pressure surface and the rotating tangent is greater than 90 degrees. The oil supply base and the thrust spacer sleeve are provided with a gap for oil supply, the pressure oil cavity collects lubricating oil when the rotor rotates, the oil throwing channel forms a pumping effect due to the fact that the length of the oil throwing channel is greater than the radial length of the oil inlet hole, lubricating oil is thrown out of the motor rotor through the oil inlet hole, the oil throwing cavity and the oil throwing channel, and oil throwing and cooling are realized. The application does not need end side oil sealing and pressing, and has compact structure and high reliability.

Description

Technical Field

[0001] This invention belongs to the field of electric auxiliary turbocharger technology, and particularly relates to an oil-throwing cooling structure for an electric auxiliary turbocharger rotor. Background Technology

[0002] The high power density and rapid response requirements of internal combustion engines necessitate continuous improvement and optimization of turbocharging system performance to ensure optimal matching between the system and the engine. Electric auxiliary turbocharging (EAG), as an effective means of improving low-speed engine performance and enhancing engine response, can well meet the requirements for optimal engine performance across all operating conditions. However, the EAG motor generates heat during operation. Since overheating can lead to motor failure, a cooling structure is required. Currently, EAG turbochargers generally use stator core heat transfer for cooling, which significantly alters the turbocharger's structure and adds considerable weight. Furthermore, it is prone to seal failure during use, causing coolant leakage and affecting overall reliability. Additionally, due to the structure of the EAG turbocharger, oil sealing and pressurization cannot be performed on the end side, unlike traditional motor structures that use rotor oil slinging for cooling. This can easily lead to insufficient cooling of the EAG turbocharger motor's stator and rotor due to lack of oil cooling.

[0003] Therefore, there is a need for an oil-slinging cooling structure for the rotor of an electric auxiliary turbocharger, which can enable the electric auxiliary turbocharger to have rotor oil-slinging cooling function during operation in order to meet the heat dissipation requirements of the electric auxiliary turbocharger. Summary of the Invention

[0004] To address the problems in the prior art, this invention proposes an oil-throwing cooling structure for an electric auxiliary turbocharger rotor. The structure utilizes an oil pressure chamber, oil inlet, oil-throwing chamber, and oil-throwing channel on the rotor system as the oil-throwing path. During turbocharger operation, lubricating oil is delivered to the oil supply seat via the oil channel. The gap between the oil supply seat and the thrust spacer sleeve of the rotor system is filled with oil. During rotor rotation, the oil pressure chamber is filled with lubricating oil. At this time, the oil-throwing channel, due to rotor rotation, creates a pumping effect, causing the lubricating oil in the oil pressure chamber to flow along the oil inlet, oil-throwing chamber, and oil-throwing channel, and then be thrown out from the outlet of the oil-throwing channel onto the motor stator and rotor, thus achieving the purpose of oil-throwing cooling for the motor stator and rotor.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: including an oil supply seat, integrated on the turbocharger bearing body; It also includes a rotor system oil slinger structure, which includes a turbine shaft, a motor rotor and a thrust spacer sleeve. The turbine shaft is a rotating main shaft, and the thrust spacer sleeve is sleeved on the turbine shaft and located between the compressor end bearing and the motor rotor. The turbine shaft has an oil slinger chamber formed inside through a central hole and a process plug. The oil slinger chamber has an oil inlet at the compressor end and an oil outlet at the motor end. The motor rotor is provided with an oil outlet channel, and the oil outlet channel is assembled with the oil outlet hole to form an oil throwing channel together. The thrust spacer sleeve is provided with an oil pressure chamber, which is assembled with the oil inlet hole accordingly; There is a gap between the oil supply seat and the thrust spacer sleeve for filling with cooling lubricating oil; The oil slinger is formed by the oil outlet and the oil channel, and the length R1 of the oil slinger is greater than the radial length R2 of the oil inlet. When the turbocharger is working, the cooling lubricating oil is delivered to the oil supply seat through the oil passage. The cooling lubricating oil in the gap between the oil supply seat and the thrust spacer sleeve fills the oil pressure chamber. The oil slinger channel is pumped by the rotation of the motor rotor, causing the lubricating oil in the oil pressure chamber to flow along the oil inlet, the oil slinger chamber, and the oil slinger channel, and to be thrown out from the outlet of the oil slinger channel onto the motor stator and the electronic rotor.

[0006] Furthermore, the oil pressure chamber is disposed on the circumferential surface of the thrust spacer sleeve, and is evenly distributed in multiple circumferential directions along the circumferential surface of the thrust spacer sleeve.

[0007] Furthermore, the oil inlet hole is a plurality of radial holes evenly distributed along the circumference of the turbine shaft.

[0008] Furthermore, the oil outlet holes are multiple radial holes evenly distributed along the circumference of the turbine shaft, and the oil outlet channels are multiple radial oil channels evenly distributed along the circumference of the motor rotor, with the oil outlet holes and oil outlet channels corresponding and connected one-to-one.

[0009] Furthermore, the oil supply seat is provided with an annular oil supply groove, which corresponds to the oil pressure chamber in the axial position.

[0010] Furthermore, the radial cross-sectional shape of the oil pressure chamber is wider on the outside and narrower on the inside, and the angle α between the pressure surface of the oil pressure chamber and the rotational tangent direction of the rotor system is greater than 90°.

[0011] Furthermore, the outlet of the oil passage is disposed toward the end of the motor stator winding and / or the outer surface of the motor rotor.

[0012] Compared with the prior art, the present invention has the following advantages and beneficial effects.

[0013] 1. This invention utilizes the existing thrust spacer sleeve of the electric auxiliary turbocharger to set up the oil pressure chamber, and forms an intermittent oil supply with the oil supply seat integrated into the bearing body. The overall structure is compact, requires little modification, and is lightweight. It innovatively realizes direct oil-throwing cooling of the motor stator and rotor, meeting the heat dissipation requirements of the electric auxiliary turbocharger.

[0014] 2. This invention ingeniously utilizes the existing thrust spacer structure of the electric auxiliary turbocharger and sets up an oil pressure chamber on it, eliminating the need for sealing and pressurizing the turbocharger end side. This solves the technical problem that the electric auxiliary turbocharger cannot use traditional rotor oil-throwing cooling due to structural limitations.

[0015] 3. The present invention has a compact structure, requires little modification to the turbocharger structure compared to the current conventional water-cooled structure, does not significantly increase weight, and uses lubricating oil cooling to avoid the risk of coolant seal failure, thus improving overall reliability.

[0016] 4. This invention utilizes the pumping action generated by the rotation of the rotor system itself to achieve oil delivery and ejection, eliminating the need for an additional oil pump or a complex oil supply system. It has a simple structure and low cost. Attached Figure Description

[0017] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the rotor oil-throwing cooling structure of the electric auxiliary turbocharger described in this invention applied to an electric auxiliary turbocharger; Figure 2 This is a schematic diagram of the rotor oil-throwing cooling structure of an electrically assisted turbocharger according to the present invention; Figure 3 This is a schematic diagram of the thrust spacer sleeve and oil pressure chamber of the present invention; Figure 4 for Figure 3 A schematic diagram of the AA section; Figure 5 This is a schematic diagram illustrating the oil-scraping and cooling process of the present invention.

[0018] Explanation of reference numerals in the attached figures: 1. Oil supply seat; 2. Turbine shaft; 3. Motor rotor; 4. Thrust spacer sleeve; 5. Oil slinger chamber; 6. Oil inlet; 7. Oil outlet; 8. Oil outlet passage; 9. Pressure chamber. Detailed Implementation

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0020] In the description of this invention, it should be understood that the technical terms "radial," "axial," "circumferential," "outer surface," etc., indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the invention 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, and therefore should not be construed as a limitation of the invention. "A plurality of" means two or more.

[0021] Words such as "include" or "contain" mean that the element preceding the word covers the elements listed after the word and their equivalents, without excluding other elements. Words such as "connect," "connect," or "fix" are not limited to a single connection or fixing method, but can include multiple connection or fixing methods, such as screw fastening, threaded connection, welding, etc.

[0022] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0023] An oil-throwing cooling structure for an electric auxiliary turbocharger rotor includes: an oil supply base 1, a turbine shaft 2, a motor rotor 3, a thrust spacer sleeve 4, an oil-throwing chamber 5, an oil inlet 6, an oil outlet 7, an oil outlet passage 8, and a pressure chamber 9.

[0024] The oil supply seat 1 is integrated into the bearing body and forms an oil supply gap with the thrust spacer sleeve 4 with clearance fit; the thrust spacer sleeve 4 is sleeved on the turbine shaft 2, and an oil pressure chamber 9 is provided on its outer periphery. The oil pressure chamber 9 is connected to the oil inlet hole 6 near the compressor end of the oil slinger chamber 5 in the turbine shaft 2; the oil slinger chamber 5 is formed by the center hole and the process plug in the turbine shaft 2, and an oil outlet hole 7 is provided near the motor end of the oil slinger chamber 5; the motor rotor 3 is sleeved on the turbine shaft 2, and the oil outlet channel 8 on the motor rotor 3 is correspondingly assembled with the oil outlet hole 7 and together forms the oil slinger channel. The outlet of the oil slinger channel faces the area of ​​the motor stator and rotor 3, so that the lubricating oil passes through the oil supply seat 1, the oil pressure chamber 9, the oil inlet hole 6, the oil slinger chamber 5 and the oil slinger channel in sequence and is then thrown out.

[0025] Preferably, the oil pressure chambers 9 are arranged on the circumferential surface of the thrust spacer sleeve 4, and are evenly distributed in multiple circumferential directions along the circumferential surface of the thrust spacer sleeve 4. By arranging the oil pressure chambers 9 on the circumferential surface of the thrust spacer sleeve 4 and evenly distributing multiple circumferentially, structurally, continuous oil supply can be achieved directly by utilizing the existing fit clearance between the thrust spacer sleeve 4 and the oil supply seat 1, without the need for additional oil collecting rings or oil guiding components, making the overall structure more compact. Functionally, during the rotation of the motor rotor 3, multiple oil pressure chambers 9 sequentially pass over the oil supply area of ​​the oil supply seat 1, ensuring that there is always a corresponding oil pressure chamber 9 connected to the oil supply seat 1 at any given time, ensuring the continuity and stability of the lubricating oil supply. At the same time, the even circumferential distribution of multiple oil pressure chambers 9 makes the oil inlet 6 uniformly distributed, and the cooling oil thrown out through the oil throwing channel forms a uniform coverage on the circumference of the motor stator and motor rotor 3, avoiding local overheating and improving the uniformity and reliability of the cooling effect.

[0026] Preferably, the oil inlet holes 6 are multiple radial holes evenly distributed around the turbine shaft 2. The even distribution of the oil inlet holes 6 around the turbine shaft 2 allows the lubricating oil in the pressure chamber 9 to enter the oil-throwing chamber 5 uniformly from all circumferential directions, avoiding uneven oil distribution or localized cavitation caused by unilateral oil inlet, and ensuring consistent oil pressure in all circumferential positions of the oil-throwing chamber 5. The radial hole structure allows the lubricating oil to enter the oil-throwing chamber 5 directly along the shortest path, resulting in low flow resistance and fast response. This facilitates the rapid establishment of a stable pumping action when the motor rotor 3 rotates, ensuring the amount and uniformity of oil thrown at the oil-throwing outlet, thereby achieving uniform and reliable cooling of the motor stator and motor rotor 3.

[0027] Preferably, the oil outlet holes 7 are multiple radial holes evenly distributed along the circumference of the turbine shaft 2, and the oil outlet channels 8 are multiple radial oil channels evenly distributed along the circumference of the motor rotor 3. The oil outlet holes 7 and the oil outlet channels 8 are connected in a one-to-one correspondence. The oil outlet holes 7 are evenly distributed along the circumference of the turbine shaft 2, which allows the lubricating oil to be evenly thrown out along the circumference when the motor rotor 3 rotates, achieving 360° full circumferential coverage cooling of the motor stator and motor rotor 3, avoiding local hot spots. The oil outlet channels 8 are set as radial oil channels, so that the oil flows from the oil throwing chamber 5 to the area of ​​the motor stator and motor rotor 3 along the shortest path. The flow resistance is small and the response is fast, which is conducive to the rapid establishment of oil throwing pressure when the motor rotor 3 rotates at high speed. The oil outlet holes 7 and the oil outlet channels 8 are connected in a one-to-one correspondence, so that each oil outlet hole 7 and oil outlet channel 8 form an independent oil throwing channel. The oil does not interfere with each other and is evenly distributed, avoiding the uneven flow and pressure loss caused by multiple holes sharing a channel. This ensures that the amount of oil thrown out of each oil throwing channel is consistent, improving the cooling uniformity and reliability.

[0028] Preferably, the oil supply seat 1 is provided with an annular oil supply groove, which corresponds to the oil pressure chamber 9 in the axial position. During the rotation of the rotor system, the oil pressure chamber 9 on the thrust spacer sleeve 4 rotates circumferentially with the motor rotor 3. The annular oil supply groove can continuously supply lubricating oil to the oil pressure chamber 9 throughout its entire circumferential rotation range, avoiding interruption of oil supply due to changes in circumferential position. This ensures that the oil pressure chamber 9 is always full of cooling lubricating oil throughout the entire speed range, ensuring the continuity of the oil slinging channel pump suction and the stability of the oil slinging cooling effect.

[0029] Preferably, the radial cross-sectional shape of the oil pressure chamber 9 is wider on the outside and narrower on the inside, and the angle α between the pressure surface of the oil pressure chamber 9 and the rotational tangent of the rotor system is greater than 90°. The radial cross-section of the oil pressure chamber 9 is wider on the outside and narrower on the inside, with a large outer opening to fully collect the lubricating oil in the gap of the oil supply seat, and a narrower inner opening to concentrate the oil and guide it to the oil inlet 6, forming a converging oil collection channel; the angle between the pressure surface and the rotational tangent of the rotor system is greater than 90°, so that when the motor rotor 3 rotates, the pressure surface acts like a pump blade to push the lubricating oil inward, actively pumping the oil from the outer periphery to the oil inlet 6 in the central area, effectively overcoming the adverse effects of centrifugal force on the outward throwing of oil, ensuring that the oil throwing chamber 5 continuously receives a sufficient supply of lubricating oil, thereby enhancing the pumping capacity of the oil throwing channel and improving the overall oil throwing cooling efficiency.

[0030] Preferably, the outlet of the oil outlet 8 is positioned towards the end of the motor stator winding and / or the outer surface of the motor rotor 3, so that the ejected lubricating oil can be directly sprayed onto the main heat-generating areas of the motor stator and motor rotor 3, achieving directional and precise cooling, avoiding oil splashing to non-heat-generating parts and causing waste, thereby obtaining higher cooling efficiency with a limited amount of ejected oil, and ensuring that the temperature rise of the motor stator and motor rotor 3 is controlled within a safe range.

[0031] An oil-throwing cooling structure for an electrically assisted turbocharger rotor, the working process of which is as follows: like Figure 5 As shown, an oil-throwing cooling structure for an electric auxiliary turbocharger rotor achieves the function of oil-throwing cooling. When the turbocharger is working, oil is supplied through the oil passage to deliver cooling lubricating oil to the oil supply seat 1. The oil supply seat 1 and the thrust spacer sleeve 4 of the rotor system are set with a reasonable gap to fill the oil. During the rotation of the rotor system, the cooling lubricating oil in the gap between the oil supply seat 1 and the thrust spacer sleeve 4 will fill the pressure oil chamber 9. At this time, the oil-throwing channel forms a pumping action due to the rotation of the rotor, causing the lubricating oil in the pressure oil chamber to flow along the oil inlet 6, the oil-throwing chamber 5, and the oil-throwing channel and be thrown out from the outlet of the oil-throwing channel. The thrown-out cooling oil will be thrown onto the motor stator and the motor rotor 3, achieving the purpose of oil-throwing cooling of the motor stator and rotor.

[0032] The specific principle is as follows: When the rotor system rotates, the lubricating oil in the oil-throwing channel flows outward under the action of centrifugal force. Since the length R1 of the oil-throwing channel is greater than the radial length R2 of the oil inlet 6, a low-pressure zone is formed in the oil-throwing channel, generating a pumping effect. Under this pumping action, the lubricating oil in the oil pressure chamber 9 is sucked in and flows along the oil inlet 6, the oil-throwing chamber 5, and the oil-throwing channel, and is finally thrown out at high speed from the outlet of the oil-throwing channel.

[0033] The above description is merely a detailed account of one embodiment of the present invention, but it is only a preferred embodiment and should not be considered as limiting the scope of the invention. All equivalent variations and improvements made within the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. An oil-throwing cooling structure for an electrically assisted turbocharger rotor, characterized in that: Including the oil supply housing, integrated into the turbocharger bearing housing; It also includes a rotor system oil slinger structure, which includes a turbine shaft, a motor rotor and a thrust spacer sleeve. The turbine shaft is a rotating main shaft, and the thrust spacer sleeve is sleeved on the turbine shaft and located between the compressor end bearing and the motor rotor. The turbine shaft has an oil slinger chamber formed inside through a central hole and a process plug. The oil slinger chamber has an oil inlet at the compressor end and an oil outlet at the motor end. The motor rotor is provided with an oil outlet channel, and the oil outlet channel is assembled with the oil outlet hole to form an oil throwing channel together. The thrust spacer sleeve is provided with an oil pressure chamber, which is assembled with the oil inlet hole accordingly; There is a gap between the oil supply seat and the thrust spacer sleeve for filling with cooling lubricating oil; The oil slinger is formed by the oil outlet and the oil channel, and the length R1 of the oil slinger is greater than the radial length R2 of the oil inlet. When the turbocharger is working, the cooling lubricating oil is delivered to the oil supply seat through the oil passage. The cooling lubricating oil in the gap between the oil supply seat and the thrust spacer sleeve fills the oil pressure chamber. The oil slinger channel is pumped by the rotation of the motor rotor, causing the lubricating oil in the oil pressure chamber to flow along the oil inlet, the oil slinger chamber, and the oil slinger channel, and to be thrown out from the outlet of the oil slinger channel onto the motor stator and the electronic rotor.

2. The oil-throwing cooling structure for an electrically assisted turbocharger rotor according to claim 1, characterized in that: The oil pressure chamber is located on the circumferential surface of the thrust spacer and is evenly distributed in multiple circumferential directions along the circumferential surface of the thrust spacer.

3. The oil-throwing cooling structure for an electrically assisted turbocharger rotor according to claim 1, characterized in that: The oil inlet holes are multiple radial holes evenly distributed along the circumference of the turbine shaft.

4. The oil-throwing cooling structure for an electrically assisted turbocharger rotor according to claim 1, characterized in that: The oil outlet holes are multiple radial holes evenly distributed along the circumference of the turbine shaft, and the oil passages are multiple radial oil passages evenly distributed along the circumference of the motor rotor. The oil outlet holes and oil passages are connected one-to-one.

5. The oil-throwing cooling structure for an electrically assisted turbocharger rotor according to claim 1, characterized in that: The oil supply seat is provided with an annular oil supply groove, which corresponds to the oil pressure chamber in the axial position.

6. The oil-throwing cooling structure for an electrically assisted turbocharger rotor according to claim 1, characterized in that: The radial cross-sectional shape of the oil pressure chamber is wider on the outside and narrower on the inside, and the angle α between the pressure surface of the oil pressure chamber and the rotational tangent direction of the rotor system is greater than 90°.

7. The oil-throwing cooling structure for an electrically assisted turbocharger rotor according to claim 1, characterized in that: The outlet of the oil passage is positioned toward the end of the motor stator winding and / or the outer surface of the motor rotor.

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