A new hybrid oil-cooled bearing body structure

Abstract

The application provides a novel hybrid oil-cooled bearing body structure, comprising a bearing body, an oil inlet is arranged in the bearing body, a compressor end floating bearing hole and a turbine end floating bearing hole which are communicated with the oil inlet respectively, and an oil outlet which is communicated with the compressor end floating bearing hole and the turbine end floating bearing hole respectively; a U-shaped tube cavity which is communicated with the oil inlet is arranged between the compressor end floating bearing hole and the turbine end floating bearing hole, and the U-shaped tube cavity is communicated with the compressor end floating bearing hole and the turbine end floating bearing hole respectively through two pressure relief holes at the bottom. The hybrid oil-cooled bearing body structure can lubricate and cool the bearing system of the turbocharger, can avoid dry friction, effectively improves the reliability of the bearing system, and avoids the phenomenon that the turbocharger is disabled due to frequent oil shortage.

Description

Technical Field

[0001] The present invention relates to the field of exhaust gas-driven automotive turbochargers, and in particular to a novel hybrid oil-cooled bearing body structure. Background Art

[0002] An exhaust gas turbocharger is a mechanical device that uses the energy of engine exhaust gases to boost pressure. It uses this energy to drive the turbine within the turbine housing, which in turn drives the coaxial compressor impeller. Fresh air enters the compressor through the air filter, where the compressor impeller rotates and compresses the fresh air, achieving the boost effect. Therefore, an exhaust gas turbocharger effectively recycles exhaust gas energy, increases the amount of air in the cylinder for a given displacement, optimizes the combustion process, and improves the efficiency of the internal combustion engine. Exhaust gas turbochargers are essential components for increasing power, saving fuel, and improving emissions in modern engines. The turbocharger bearing system, along with the turbine and compressor, is one of the three key components of a turbocharger. The bearing system plays a vital role in both improving the overall efficiency of the turbocharger and ensuring its structural reliability.

[0003] With the continuous use of new energy, especially the application of batteries, for the working cycle of turbochargers, especially hybrid engines, the battery starts the motor at low speed, thereby quickly starting the engine, and the turbocharger intervenes when the speed increases to a certain margin; when the engine speed drops to a certain range, the turbocharger stops working and the battery drives the motor to intervene.

[0004] Hybrid engines can certainly greatly increase the engine's rapid responsiveness, but when the battery drives the motor to intervene, the start and stop of the turbocharger will be delayed for a certain period of time due to inertia. During this period of time, the engine's oil supply will stop, resulting in insufficient lubrication and dry friction problems, which will seriously affect the service life of the turbocharger bearing system.

[0005] like Figure 1-Figure 2As shown, the existing turbocharger bearing system and its bearing body structure mainly include an oil inlet 1, a compressor-end floating bearing hole 2 and a turbine-end floating bearing hole 3 respectively connected to the oil inlet, and an oil outlet 4 respectively connected to the compressor-end floating bearing hole and the turbine-end floating bearing hole. Lubricating oil can directly lubricate and cool the compressor-end floating bearing 5 and the turbine-end floating bearing 6 at the compressor-end floating bearing hole 2 and the turbine-end floating bearing hole 3. However, when the hybrid engine frequently starts and stops the turbocharger, the engine will stop supplying oil, and the turbocharger will have a certain time delay due to inertia. The bearing structure in the existing bearing system of the turbocharger will cause dry friction due to lack of oil, and the dry friction will cause damage to the bearing system, thereby affecting the overall reliability of the turbocharger. In severe cases, the turbocharger will fail due to lack of oil supply.

[0006] In view of this, it is necessary to provide a new hybrid oil-cooled bearing body structure to solve or at least alleviate the technical defects of dry friction generated in the above-mentioned bearing system and the impact on the overall reliability of the turbocharger. Summary of the Invention

[0007] The main purpose of the present invention is to provide a novel hybrid oil-cooled bearing body structure, aiming to solve the technical problem in the prior art that dry friction occurs in the bearing system and the overall reliability of the turbocharger is affected.

[0008] To achieve the above objectives, the present invention provides a novel hybrid oil-cooled bearing structure, comprising a bearing body, wherein the bearing body is provided with an oil inlet, a compressor-end floating bearing hole and a turbine-end floating bearing hole respectively connected to the oil inlet, and an oil outlet respectively connected to the compressor-end floating bearing hole and the turbine-end floating bearing hole;

[0009] A U-shaped tube cavity connected to the oil inlet is opened between the compressor end floating bearing hole and the turbine end floating bearing hole. The U-shaped tube cavity is connected to the compressor end floating bearing hole and the turbine end floating bearing hole through two pressure relief holes at the bottom.

[0010] Furthermore, the bearing body is provided with a main oil hole, and a compressor end oil hole and a turbine end oil hole respectively connected to the main oil hole;

[0011] Wherein, the floating bearing hole at the compressor end is connected to the oil inlet through the main oil hole and the compressor end oil guide hole; the floating bearing hole at the turbine end is connected to the oil inlet through the main oil hole and the turbine end oil guide hole.

[0012] Further, a groove oil cavity is arranged on the main oil hole, and an oil injection hole is arranged at the bottom of the groove oil cavity and faces the U-shaped tube cavity.

[0013] Further, the diameter of the main oil hole is greater than the diameter of the oil injection hole.

[0014] Further, the ratio of the diameter of the main oil hole to the diameter of the oil injection hole is 1:0.2-0.4.

[0015] Further, the first end of the pressure relief hole is close to the inside of the U-shaped tube, and the second end of the pressure relief hole is close to the compressor end floating bearing hole or the turbine end floating bearing hole.

[0016] Further, the diameter of the first end of the pressure relief hole is less than the diameter of the second end of the pressure relief hole, and the diameter of the second end of the pressure relief hole is greater than or equal to the diameter of the oil injection hole.

[0017] Further, the ratio of the diameter of the first end of the pressure relief hole to the diameter of the second end of the pressure relief hole is 1:1.5-2, and the ratio of the diameter of the oil injection hole to the diameter of the second end of the pressure relief hole is 1:1-1.2.

[0018] Further, a main oil cavity is arranged in the bearing body, and the oil outlet is arranged at the bottom of the main oil cavity and communicates with the compressor end floating bearing hole and the turbine end floating bearing hole through the main oil cavity.

[0019] Compared with the prior art, the application has the following advantages:

[0020] The hybrid application oil cooling bearing body structure can lubricate and cool the bearing system of the turbocharger, avoid dry friction, effectively improve the reliability of the bearing system, and avoid the phenomenon that the turbocharger fails due to frequent oil shortage; the U-shaped tube cavity is arranged between the compressor floating bearing hole and the turbine end floating bearing hole, so that the lubricating oil can lubricate and cool the bearing system through the pressure relief hole at the bottom of the U-shaped tube cavity, and the bearing system will not appear dry friction after the turbocharger is started and stopped.

[0021] In addition, by opening the groove oil chamber on the main oil hole and setting an oil injection hole facing the U-shaped tube cavity at the bottom of the groove oil chamber, a portion of the lubricating oil can enter the U-shaped tube cavity for storage; by setting the diameter size of the main oil hole, the oil injection hole, the first end of the pressure relief hole, the second end of the pressure relief hole and other components or positions, the pressure balance between the U-shaped tube cavity and the floating bearing hole at the compressor end and the floating bearing hole at the turbine end can be achieved, and it can facilitate the lubricating oil to flow to the floating bearing hole at the compressor end and the floating bearing hole at the turbine end after the turbocharger is started and stopped. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0023] Figure 1 It is a structural schematic diagram of the bearing body structure in the background technology;

[0024] Figure 2 Schematic diagram of the structure of a turbocharger bearing system in the background technology;

[0025] Figure 3 This is a schematic structural diagram of the novel hybrid oil-cooled bearing structure of the present invention;

[0026] Figure 4 It is a structural schematic diagram of the turbocharger bearing system in the present invention.

[0027] Explanation of the accompanying drawings: oil inlet 1, compressor end floating bearing hole 2, turbine end floating bearing hole 3, oil outlet 4, compressor end floating bearing 5, turbine end floating bearing 6, bearing body 7, oil inlet 8, main oil hole 9, compressor end oil guide hole 10, turbine end oil guide hole 11, U-shaped tube cavity 12, groove oil cavity 13, oil injection hole 14, pressure relief hole 15, compressor end floating bearing hole 16, turbine end floating bearing hole 17, main oil cavity 18, oil outlet 19, compressor end floating bearing 20, turbine end floating bearing 21.

[0028] The realization of the objectives, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0030] It should be noted that all directional indications (such as up, down, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0031] In addition, the terms "first," "second," and so on, used in this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one of these features.

[0032] Moreover, the technical solutions between the various embodiments of the present invention may be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0033] like Figure 3-Figure 4 As shown, the present invention provides a novel hybrid oil-cooled bearing body structure, including a bearing body 7. The bearing body 7 is the main structure of the bearing body structure, and other structures and shapes related to the present invention are formed inside the bearing body.

[0034] The bearing body 7 is provided with an oil inlet 8, a compressor-end floating bearing hole 16 and a turbine-end floating bearing hole 17 respectively connected to the oil inlet 8, and an oil outlet 19 respectively connected to the compressor-end floating bearing hole 16 and the turbine-end floating bearing hole 17;

[0035] Among them, the oil inlet 8 enables the lubricating oil to enter the interior of the bearing body 7. The compressor-end floating bearing hole 16 and the turbine-end floating bearing hole 17 are respectively close to the compressor and turbine of the turbocharger, and the compressor-end floating bearing hole 16 and the turbine-end floating bearing hole 17 are respectively connected to the oil inlet 8, so that the lubricating oil can enter the compressor-end floating bearing hole 16 and the turbine-end floating bearing hole 17 from the oil inlet 8 during normal operation, thereby ensuring the operation of the turbocharger bearing system.

[0036] It should be noted that a U-shaped tube cavity 12 connected to the oil inlet 8 is opened between the compressor end floating bearing hole 16 and the turbine end floating bearing hole 17, and the U-shaped tube cavity 12 has a cooling and lubricating oil cavity structure. The U-shaped tube cavity 12 is connected to the compressor end floating bearing hole 16 and the turbine end floating bearing hole 17 through two pressure relief holes 15 at the bottom, that is, the U-shaped tube cavity 12 is connected to the compressor end floating bearing hole 16 through one pressure relief hole 15 at the bottom, and is also connected to the turbine end floating bearing hole 17 through another pressure relief hole 15 at the bottom, so that after the turbocharger is started and stopped, the compressor end floating bearing hole 16 and the turbine end floating bearing hole 17 will not be quickly cut off from oil; in addition, during the oil storage process, the U-shaped tube cavity 12 can not only assist in lubricating the rotor shaft of the turbocharger bearing system, but also reduce its thermal load.

[0037] In the above embodiment, when the turbocharger stops due to inertia delay, the U-tube principle is used to improve the lubrication and cooling effect of the bearing system, avoiding dry friction, thereby improving the reliability of the entire turbocharger bearing system.

[0038] Specifically, the bearing body 7 is further provided with a main oil hole 9, and a compressor-end oil guide hole 10 and a turbine-end oil guide hole 11 respectively connected to the main oil hole 9; wherein the compressor-end floating bearing hole 16 is connected to the oil inlet 8 through the main oil hole 9 and the compressor-end oil guide hole 10; the turbine-end floating bearing hole 17 is connected to the oil inlet 8 through the main oil hole 9 and the turbine-end oil guide hole 11.

[0039] By providing the main oil hole 9, the compressor-end oil guide hole 10, and the turbine-end oil guide hole 11, which are respectively connected to the main oil hole 9, lubricating oil can sequentially enter the oil inlet 8 and the main oil hole 9, and after entering the main oil hole 9, pass through the compressor-end oil guide hole 10 and the turbine-end oil guide hole 11 to enter the compressor-end floating bearing hole 16 and the turbine-end floating bearing hole 17, respectively. In addition, the compressor-end oil guide hole 10 and the turbine-end oil guide hole 11 can be inclined holes.

[0040] As a preferred embodiment of the above embodiment, a groove oil chamber 13 is provided on the main oil hole 9, and an oil injection hole 14 is provided at the bottom of the groove oil chamber 13 facing the U-shaped tube cavity 12; wherein, the U-shaped tube cavity 12 is connected to the oil inlet 8 through the main oil hole 9, the groove oil chamber 13 and the oil injection hole 14.

[0041] The above embodiment realizes the indirect connection between the U-shaped tube cavity 12 and the main oil hole 9. Moreover, the U-shaped tube cavity 12 is connected with the main oil hole 9 through the groove oil cavity 13 and the oil injection hole 14, which will cause a part of the lubricating oil to flow into the groove oil cavity 13. Due to gravity and the pressure of the main oil hole 9, the lubricating oil will enter the U-shaped tube cavity 12 through the oil injection hole 14. The U-shaped tube cavity 12 is in the process of storing lubricating oil until the pressure of the U-shaped tube cavity 12 and the compressor end floating bearing hole 16 and the turbine end floating bearing hole 17 reaches equilibrium.

[0042] As another preferred embodiment of the above embodiment, the diameter of the main oil hole 9 ( Figure 3 D1 in the figure is larger than the diameter of the oil injection hole 14 ( Figure 3 D2 in the figure) is used to prevent insufficient lubricating oil from flowing directly to the compressor-end floating bearing hole 16 and / or the turbine-end floating bearing hole 17. In one embodiment, the diameter ratio of the main oil hole 9 to the oil injection hole 14 is 1:0.2-0.4. Specifically, the diameter ratio of the main oil hole 9 to the oil injection hole 14 is 1:0.3.

[0043] In order to achieve pressure balance between the U-shaped tube cavity 12 and the compressor end floating bearing hole 16 and the turbine end floating bearing hole 17, and to facilitate the flow of lubricating oil to the compressor end floating bearing hole 16 and the turbine end floating bearing hole 17 after the turbocharger is started and stopped, the first end of the pressure relief hole 15 is close to the interior of the U-shaped tube, and the second end of the pressure relief hole 15 is close to the compressor end floating bearing hole 16 or the turbine end floating bearing hole 17; wherein, the diameter of the first end of the pressure relief hole 15 ( Figure 3 D3 in the figure) is larger than the diameter of the second end of the pressure relief hole 15 ( Figure 3 D4), the diameter of the second end of the first pressure relief hole 15 is greater than or equal to the diameter of the oil injection hole 14.

[0044] As a better solution of the above embodiment, the ratio of the diameters of the second end and the first end of the pressure relief hole 15 is 1:1.5-2, preferably 1:1.5; the ratio of the diameters of the oil injection hole 14 and the second end of the pressure relief hole 15 is 1:1-1.2, preferably 1:1.

[0045] In addition, a main oil chamber 18 is provided in the bearing body 7 ; the oil outlet 19 is located at the bottom of the main oil chamber 18 , and the oil outlet 19 is connected to the compressor end floating bearing hole 16 and the turbine end floating bearing hole 17 respectively through the main oil chamber 18 .

[0046] It should be known that the turbocharger bearing system including the new hybrid oil-cooled bearing body structure in the above-mentioned embodiments can lubricate and cool the bearing system of the turbocharger, so that the compressor end floating bearing 20 and the turbine end floating bearing 21 can be lubricated after starting and stopping, the dry friction condition is avoided, the reliability of the bearing system is effectively improved, and the phenomenon that the turbocharger is disabled due to frequent oil shortage is avoided.

[0047] The working mode of the application can be that when the engine works normally, the lubricating oil enters the main oil guide hole 9 from the oil inlet 8, part of the lubricating oil in the main oil guide hole 9 enters the compressor end floating bearing hole 16 and the turbine end floating bearing hole 17 through the compressor end oil guide hole 10 and the turbine end oil guide hole 11 respectively, and directly lubricates and cools the compressor end floating bearing 20, the turbine end floating bearing 21 and the turbine end sealing ring of the turbocharger bearing system.

[0048] Another part of the lubricating oil in the main oil guide hole 9 flows into the groove oil cavity 13, and due to the gravity and the pressure of the main oil guide hole 9, enters the U-shaped tube cavity 12 for lubrication and cooling through the oil injection hole 14. The U-shaped tube cavity 12 is in the process of storing lubricating oil, until the pressure of the U-shaped tube cavity 12 and the compressor end floating bearing hole 16 and the turbine end floating bearing hole 17 reaches balance. In the oil storage process, the rotor shaft of the turbocharger bearing system is lubricated while the heat load phenomenon is reduced.

[0049] When the engine stops, the oil pump stops supplying oil, at this time, the lubricating oil stored in the U-shaped tube cavity 12 flows into the compressor end floating bearing hole 16 and the turbine end floating bearing hole 17 through the oil drain hole by using the U-shaped tube principle, and provides the lubricating oil required for lubrication and cooling of the bearing system in the delay stop stage of the turbocharger due to inertia; this structure form also has remarkable effect on improving the reliability of the turbocharger.

[0050] In the above technical solution of the application, the above is only the preferred embodiment of the application, and does not limit the patent scope of the application, and any equivalent structural transformation made by using the content of the application specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection scope of the application.

Claims

1. A novel hybrid oil-cooled bearing structure, comprising a bearing body, the bearing body having an oil inlet, a compressor-end floating bearing hole and a turbine-end floating bearing hole respectively connected to the oil inlet, and an oil outlet respectively connected to the compressor-end floating bearing hole and the turbine-end floating bearing hole; It is characterized by: A U-shaped tube cavity connected to the oil inlet is opened between the floating bearing hole at the compressor end and the floating bearing hole at the turbine end. The U-shaped tube cavity is connected to the floating bearing hole at the compressor end and the floating bearing hole at the turbine end through two pressure relief holes at the bottom. When the oil pump stops supplying oil, the lubricating oil stored in the U-shaped tube cavity flows into the floating bearing hole at the compressor end and the floating bearing hole at the turbine end through the pressure relief hole according to the U-shaped tube principle; The bearing body is further provided with a main oil hole, and a compressor-end oil guide hole and a turbine-end oil guide hole respectively connected to the main oil hole; wherein the compressor-end floating bearing hole is connected to the oil inlet through the main oil hole and the compressor-end oil guide hole; and the turbine-end floating bearing hole is connected to the oil inlet through the main oil hole and the turbine-end oil guide hole. A groove oil cavity is formed on the main oil hole, and an oil injection hole is provided at the bottom of the groove oil cavity, facing the U-shaped tube cavity; wherein the U-shaped tube cavity is connected to the oil inlet through the main oil hole, the groove oil cavity and the oil injection hole; the diameter of the main oil hole is larger than the diameter of the oil injection hole; The first end of the pressure relief hole is close to the interior of the U-shaped tube, and the second end of the pressure relief hole is close to the floating bearing hole at the compressor end or the floating bearing hole at the turbine end; wherein, the diameter of the first end of the pressure relief hole is greater than the diameter of the second end of the pressure relief hole, and the diameter of the second end of the pressure relief hole is greater than or equal to the diameter of the oil injection hole.

2. The novel hybrid oil-cooled bearing structure according to claim 1 is characterized in that: The diameter ratio of the main oil hole to the oil injection hole is 1:0.2-0.

4.

3. The novel hybrid oil-cooled bearing structure according to claim 1 is characterized in that: The ratio of the diameters of the second end of the pressure relief hole to the first end is 1:1.5-2; the ratio of the diameters of the oil injection hole to the second end of the pressure relief hole is 1:1-1.

2.

4. The novel hybrid oil-cooled bearing structure according to claim 1 is characterized in that: A main oil chamber is also provided in the bearing body; the oil outlet is located at the bottom of the main oil chamber, and the oil outlet is connected to the compressor end floating bearing hole and the turbine end floating bearing hole respectively through the main oil chamber.

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