Thrust bearing for turbocharger

Abstract

The invention relates to the technical field of manufacturing of turbocharger bearings, in particular to a thrust bearing for a turbocharger, which comprises a ring body, a thrust ring, a thrust ring and a thrust ring, the multiple thrust tables are arranged on the axial end face of the ring body, and the multiple thrust tables are arranged in the circumferential direction of the shaft cavity; the oil film grooves are located between the adjacent thrust tables in the circumferential direction of the shaft cavity, and the oil film grooves are sunken in the thrust tables in the axial direction; the oil baffle wall is positioned between the oil film groove and the radial direction of the shaft cavity; the oil inlet groove is formed in the ring body and penetrates through the oil blocking wall, one end of the oil inlet groove is communicated with the oil film groove, and the other end of the oil inlet groove is communicated with the shaft cavity. The lubricating stability of the thrust end of the thrust bearing is improved, and the service life of the thrust bearing is prolonged.

Description

Technical Field

[0001] This invention relates to the field of turbocharger bearing manufacturing technology, and more specifically to a thrust bearing for turbochargers. Background Technology

[0002] The thrust bearing in a turbocharger is a critical load-bearing component that needs to operate stably under high-speed and high-temperature conditions. Traditional designs typically rely on the thrust surface, which forms a sliding friction pair with the shaft shoulder, and lubrication and cooling are achieved through lubrication oil passages. However, in actual operation, lubricating oil is prone to leaking from the oil grooves in the friction pair area into the radially inward shaft cavity, resulting in insufficient oil film thickness and uneven pressure distribution, which can easily lead to lubrication failure and abnormal bearing wear.

[0003] To address the aforementioned issues, while existing technologies improve oil supply by creating oil grooves on the thrust surface, they lack effective constraints on the radial flow of the oil, making it difficult to guarantee oil film stability. Especially under varying operating conditions, oil loss intensifies, deteriorating the lubrication conditions of the thrust face, which not only affects bearing life but may also restrict the overall performance and reliability of the turbocharger. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention provides a thrust bearing for a turbocharger, which improves the stability of lubrication at the thrust end of the thrust bearing and increases the service life of the thrust bearing.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: A thrust bearing for a turbocharger, comprising: The ring body has an axially penetrating cavity at its center; Several thrust blocks are provided on the axial end face of the ring body, and the several thrust blocks are arranged in a circumferential direction around the shaft cavity; The oil film groove is located between adjacent thrust plates in the circumferential direction of the shaft cavity, and is recessed into the thrust plate in the axial direction. The oil baffle is located radially between the oil film groove and the shaft cavity; The oil inlet groove is located on the ring body and penetrates the oil baffle wall. One end of the oil inlet groove is connected to the oil film groove, and the other end of the oil inlet groove is connected to the shaft cavity.

[0006] Based on the above structure, the principle of a thrust bearing for a turbocharger is as follows: the ring is installed in the housing of the turbocharger, the turbocharger shaft is fitted with the shaft cavity with clearance, the end of the ring is axially abutted against the protrusion on the shaft through the thrust plate to limit the axial movement of the shaft, the oil passage is connected to the shaft cavity and enters the shaft cavity and is delivered to the oil film groove located at the end of the ring through the oil inlet groove to form an oil film at the end of the ring and realize the lubrication of the thrust end.

[0007] Furthermore, in a thrust bearing for a turbocharger, the oil film groove extends in an arc shape in the circumferential direction of the shaft cavity, and the oil baffle is configured as the arc-shaped edge of the radially inner side of the oil film groove.

[0008] Furthermore, in a thrust bearing for a turbocharger disclosed in this application, the depth of the oil film groove is configured to gradually decrease from deep to shallow along its arcuate extension direction. An oil inlet groove penetrates the oil baffle wall on one side of the deeper circumferential end of the oil film groove, and the shallower circumferential end of the oil film groove extends to intersect with the edge of the thrust plate's end face. As a preferred embodiment of this application, the oil film can be extended to the thrust plate, achieving stable oil supply to the thrust surface.

[0009] Furthermore, in one thrust bearing for a turbocharger in this application, the oil baffle wall is coplanar with the thrust plate.

[0010] Furthermore, in one thrust bearing for a turbocharger in this application, the outer radial side of the oil film groove extends beyond the outer edge of the ring end face, forming an open outer edge structure.

[0011] Furthermore, in this application, a thrust bearing for a turbocharger includes an annular boss located at the axial end of the ring body, and a thrust plate, an oil film groove, and an oil baffle wall are disposed on the end face of the annular boss.

[0012] Furthermore, in this application, a thrust bearing for a turbocharger includes a shaft cavity with a tapered slope at its axial end. The radial dimension of the tapered slope gradually increases towards the end of the adjacent ring body, and the tapered slope intersects with the radially inner edge of the oil baffle wall. As a preferred embodiment of this application, the tapered slope facilitates the axial installation of the shaft and the shaft cavity. Furthermore, due to the tapered slope, if the oil baffle wall were not provided, the oil in the oil film groove would easily flow back into the shaft cavity. The oil baffle wall in this application effectively prevents this problem from occurring.

[0013] Furthermore, in this application, a thrust bearing for a turbocharger includes a shaft cavity comprising a limiting cavity and an oil reservoir. The limiting cavity is located at both axial ends of the oil reservoir, and its radial dimension is smaller than that of the oil reservoir. An oil inlet groove extends on the side wall of the limiting cavity to communicate with the oil reservoir. A perforation communicating with the oil reservoir is provided through the side wall of the ring body. As a preferred embodiment of this application, the perforation is used to install an oil inlet nozzle. Lubricating oil enters the oil reservoir through the perforation and is then guided through the oil inlet groove to the axial end face of the ring body to form an oil film on the end face.

[0014] Furthermore, in a thrust bearing for a turbocharger, several thrust plates, oil film grooves, oil baffles, and oil inlet grooves are evenly distributed in the circumferential direction around the shaft cavity.

[0015] As can be seen from the above technical solution, the present invention has the following beneficial effects: This invention provides a thrust bearing for a turbocharger. An oil baffle wall isolates the oil film groove and the shaft cavity, effectively preventing oil from flowing radially inward from the oil film groove into the shaft cavity, thus avoiding interference with oil film formation stability and preventing lubrication failure. Therefore, it improves the stability of lubrication at the thrust end of the thrust bearing and extends its service life. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a thrust bearing for a turbocharger in an embodiment of this application; Figure 2 for Figure 1 A magnified view of a portion of area A in the middle frame; Figure 3 This is a longitudinal sectional view of a thrust bearing for a turbocharger in an embodiment of this application.

[0017] In the figure: 1-ring body; 10-shaft cavity; 101-conical slope; 102-limiting cavity; 103-oil storage cavity; 11-annular boss; 12-perforation; 2-thrust plate; 3-oil film groove; 4-oil baffle wall; 5-oil inlet groove. Detailed Implementation

[0018] Combination Figure 1 , Figure 2 A thrust bearing for a turbocharger, shown, includes: The ring body 1 has an axially penetrating cavity 10 at its center; Several thrust blocks 2 are provided on the axial end face of the ring body 1, and the several thrust blocks 2 are arranged around the circumference of the shaft cavity 10. Oil film groove 3 is located between adjacent thrust plates 2 in the circumferential direction of shaft cavity 10, and in the axial direction, oil film groove 3 is recessed into thrust plate 2. Oil baffle 4 is located radially between oil film groove 3 and shaft cavity 10; Oil inlet groove 5 is set on ring 1. Oil inlet groove 5 penetrates oil baffle wall 4. One end of oil inlet groove 5 is connected to oil film groove 3. The other end of oil inlet groove 5 is connected to shaft cavity 10.

[0019] Based on the above structure, a thrust bearing for a turbocharger operates as follows: An annular ring 1 is installed in the turbocharger housing. The turbocharger shaft is fitted with a clearance fit in the shaft cavity 10. The end of the annular ring 1 axially abuts against a protrusion on the shaft via a thrust plate 2 to axially limit the shaft's movement. An oil passage connects to the shaft cavity 10, enters the shaft cavity 10, and is delivered to the oil film groove 3 located at the end of the annular ring 1 through an oil inlet groove 5, forming an oil film at the end of the annular ring 1 to lubricate the thrust end. In this application, an oil baffle wall 4 isolates the oil film groove 3 from the shaft cavity 10, effectively preventing oil from flowing radially inward from the oil film groove 3 back into the shaft cavity 10, affecting the stability of the oil film formation and thus preventing lubrication failure. Therefore, the stability of the thrust end lubrication of the thrust bearing is improved, increasing the service life of the thrust bearing. Specifically, in this embodiment, a thrust plate 2, an oil film groove 3, an oil baffle wall 4, and an oil inlet groove 5 are provided at both ends of the annular ring 1.

[0020] In this embodiment, the oil film groove 3 extends in an arc shape in the circumferential direction of the shaft cavity 10, and the oil baffle wall 4 is configured as the arc-shaped edge of the radially inner side of the oil film groove 3. Therefore, the oil film groove 3 has a fan-shaped annular shape.

[0021] In this embodiment, the depth of the oil film groove 3 is configured to gradually change from deep to shallow in its arc-shaped extension direction. The oil inlet groove 5 penetrates the oil-blocking wall 4 on the side of the deeper end of the corresponding oil film groove 3, and the shallow end of the oil film groove 3 extends to intersect with the edge of the end face of the thrust table 2. This allows the oil film to be extended to the thrust table 2, achieving stable oil supply to the thrust surface.

[0022] In this embodiment, several thrust blocks 2, oil film grooves 3, oil baffles 4, and oil inlets 5 are evenly distributed in the circumferential direction around the shaft cavity 10. Specifically, the number of thrust blocks 2 on one end face is 3.

[0023] In this embodiment, the oil baffle 4 and the thrust plate 2 are coplanar.

[0024] In this embodiment, the outer radial side of the oil film groove 3 extends outward from the outer edge of the end face of the ring body 1, forming an open outer edge structure.

[0025] In this embodiment, the ring body 1 includes an annular boss 11 located at the axial end, and a thrust plate 2, an oil film groove 3, and an oil baffle wall 4 are disposed on the end face of the annular boss 11.

[0026] In this embodiment, the shaft cavity 10 includes a tapered slope 101 located at its axial end. The radial dimension of the tapered slope 101 gradually increases towards the end of the adjacent annular body 1. The tapered slope 101 intersects with the radially inner edge of the oil baffle wall 4. The tapered slope 101 is provided to facilitate the axial installation of the shaft and the shaft cavity 10. Furthermore, because the tapered slope 101 is provided, if the oil baffle wall 4 is not provided, the oil in the oil film groove 3 is very likely to flow back into the shaft cavity 10. In this application, the oil baffle wall 4 is provided, which can effectively avoid this problem.

[0027] Combination Figure 3 As shown, in this embodiment, the shaft cavity 10 includes a limiting cavity 102 and an oil storage cavity 103. The limiting cavity 102 is located at both axial ends of the oil storage cavity 103. The radial dimension of the limiting cavity 102 is smaller than the radial dimension of the oil storage cavity 103. The oil inlet groove 5 extends on the side wall of the limiting cavity 102 to communicate with the oil storage cavity 103. The side wall of the ring body 1 is provided with a through hole 12 communicating with the oil storage cavity 103. The through hole 12 is used to set the oil inlet nozzle. The lubricating oil enters the oil storage cavity 103 from the through hole 12, and is then guided to the axial end face of the ring body 1 through the oil inlet groove 5 to form an oil film on the end face.

[0028] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of the invention and should not be construed as limiting the scope of protection of the invention in any way. Based on this explanation, those skilled in the art can conceive of other specific embodiments of the invention without creative effort, and these embodiments will all fall within the scope of protection of the present invention.

Claims

1. A thrust bearing for a turbocharger, characterized in that, include: The ring body (1) has an axially penetrating cavity (10) at its center. Several thrust blocks (2) are provided on the axial end face of the ring body (1), and the several thrust blocks (2) are arranged in a circumferential direction around the shaft cavity (10); Oil film groove (3) is located between adjacent thrust plates (2) in the circumferential direction of the shaft cavity (10), and in the axial direction the oil film groove (3) is recessed into the thrust plate (2). Oil baffle (4) is located radially between oil film groove (3) and shaft cavity (10); Oil inlet groove (5) is set on the ring body (1). The oil inlet groove (5) penetrates the oil baffle wall (4). One end of the oil inlet groove (5) is connected to the oil film groove (3), and the other end of the oil inlet groove (5) is connected to the shaft cavity (10).

2. A thrust bearing for a turbocharger according to claim 1, characterized in that: The oil film groove (3) extends in an arc shape in the circumferential direction of the shaft cavity (10), and the oil baffle wall (4) is configured as the arc-shaped edge of the radial inner side of the oil film groove (3).

3. A thrust bearing for a turbocharger according to claim 2, characterized in that: The depth of the oil film groove (3) is configured to gradually change from deep to shallow in its arc-shaped extension direction. The oil inlet groove (5) penetrates the oil baffle wall (4) on the side of the deep end of the corresponding oil film groove (3). The shallow end of the oil film groove (3) extends to intersect with the edge of the end face of the thrust table (2).

4. A thrust bearing for a turbocharger according to claim 1, characterized in that: The oil baffle (4) is coplanar with the thrust plate (2).

5. A thrust bearing for a turbocharger according to claim 1, characterized in that: The oil film groove (3) extends radially outward from the outer edge of the end face of the ring body (1).

6. A thrust bearing for a turbocharger according to claim 1, characterized in that: The ring body (1) includes an annular boss (11) located at the axial end, and the thrust plate (2), oil film groove (3), and oil baffle (4) are disposed on the end face of the annular boss (11).

7. A thrust bearing for a turbocharger according to claim 1, characterized in that: The shaft cavity (10) includes a tapered slope (101) located at its axial end, the radial dimension of which gradually increases toward the end of the adjacent side ring (1), and the tapered slope (101) intersects the radially inner edge of the oil baffle wall (4).

8. A thrust bearing for a turbocharger according to claim 1, characterized in that: The shaft cavity (10) includes a limiting cavity (102) and an oil storage cavity (103). The limiting cavity (102) is located at both ends of the oil storage cavity (103) in the axial direction. The radial dimension of the limiting cavity (102) is smaller than the radial dimension of the oil storage cavity (103). The oil inlet groove (5) extends on the side wall of the limiting cavity (102) to communicate with the oil storage cavity (103). The side wall of the ring body (1) is provided with a through hole (12) communicating with the oil storage cavity (103).

9. A thrust bearing for a turbocharger according to claim 1, characterized in that: Several of the thrust plates (2), oil film grooves (3), oil baffles (4), and oil inlets (5) are evenly distributed in the circumferential direction of the shaft cavity (10).

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