Sealing structure for turbocharger

Abstract

The utility model discloses a subject in providing a kind of the sealing structure of turbocharger capable of inhibiting the outflow of waste gas.A kind of the sealing structure of turbocharger, it has: drive shaft, it extends to inside from the outside of exhaust pipe;Bearing is set to the periphery of the drive shaft;And arm piece is set to the exhaust pipe, is linked with the drive shaft, and rotates with the drive shaft, the first surface of the bearing and the second surface of the arm piece are opposite, when the arm piece moves towards the bearing, the second surface and the first surface contact, the first surface has one of curved surface or conical shape, the second surface has the one of curved surface or conical shape.

Description

Technical Field

[0001] This utility model relates to a sealing structure for a turbocharger. Background Technology

[0002] Turbochargers include blades and bypass valves (WGVs). Techniques for sealing the arms of the driven blades have been developed (e.g., Patent Document 1, etc.).

[0003] Patent Document 1: Japanese Patent Application Publication No. 2010-90714 Utility Model Content

[0004] In exhaust systems, gaps are sometimes incorporated between components to account for thermal expansion. There is a possibility that exhaust gas may escape through these gaps. Therefore, the purpose of this invention is to provide a sealing structure for a turbocharger capable of suppressing exhaust gas escape.

[0005] The above objective can be achieved by a sealing structure for a turbocharger, the sealing structure comprising: a drive shaft extending from the outside to the inside of an exhaust pipe; a bearing disposed around the drive shaft; and an arm disposed in the exhaust pipe, connected to the drive shaft, and rotating together with the drive shaft, wherein a first surface of the bearing is opposite to a second surface of the arm, and the second surface contacts the first surface when the arm moves toward the bearing, the first surface having either a curved or a conical shape, and the second surface having either a curved or a conical shape.

[0006] Utility Model Effect

[0007] It can provide a sealing structure for a turbocharger that can suppress exhaust gas flow. Attached Figure Description

[0008] Figure 1 This is a schematic diagram illustrating the sealing structure according to the first embodiment.

[0009] Figure 2 This is a diagram illustrating the sealing structure involved in the comparative example.

[0010] Figure 3 (a) is a schematic diagram illustrating the sealing structure according to the second embodiment. Figure 3 (b) is a schematic diagram illustrating the sealing structure according to the third embodiment. Detailed Implementation

[0011] <First Embodiment>

[0012] Hereinafter, the sealing structure of the turbocharger according to the first embodiment will be described with reference to the accompanying drawings. Figure 1This is a schematic diagram illustrating the sealing structure 100 according to the first embodiment. The sealing structure 100 is mounted in a vehicle and is suitable for a turbocharger. The sealing structure 100 includes a rod 10, a connecting rod 12, a pin 14 (drive shaft), a bushing 16 (bearing), an arm 18, and a valve 20. Figure 1 The -X and +X directions in the text indicate the direction in which pin 14 extends.

[0013] The outer side of the exhaust pipe is located further -X than the wall 11. The inner side of the exhaust pipe is located further +X than the wall 11. The arm 18 and valve 20 are located inside the exhaust pipe. The rod 10 and connecting rod 12 are located outside the exhaust pipe. The pressure outside the exhaust pipe is approximately equal to atmospheric pressure. The pressure inside the exhaust pipe may sometimes be higher than atmospheric pressure.

[0014] A rod 10 is mounted at one end of a connecting rod 12. A pin 14 is mounted at the other end of the connecting rod 12. A bushing 16 is, for example, cylindrical, and has the pin 14 disposed on its inner side. The pin 14 is surrounded by the bushing 16. The bushing 16 is inserted into the wall 11 of the exhaust pipe. The pin 14 and the bushing 16 extend from the outside of the exhaust pipe into the inside of the exhaust pipe.

[0015] Pin 14 extends from link 12 to arm 18. The -X end of pin 14 is connected to link 12, and the +X end is connected to arm 18. Valve 20 is the valve body of the WGV valve and is connected to arm 18.

[0016] The arm 18 includes a portion 40 and a portion 42. The portion 42 protrudes from the portion 40 toward the -X side and is connected to a pin 14. A valve 20 is mounted on the portion 40. The portion 40 and portion 42 are integrally formed, for example, from a metal such as stainless steel.

[0017] Figure 1 The dashed line in the diagram is an imaginary line segment representing axis A. Pin 14 rotates about axis A. If a force is applied to rod 10, a force is also applied to pin 14 via connecting rod 12, causing pin 14 to rotate. Arm 18 rotates together with pin 14. Since valve 20 is connected to arm 18, it rotates together with arm 18. Thus, WGV opens and closes.

[0018] High-temperature exhaust gases flow through a vehicle's exhaust system. Therefore, components sometimes undergo thermal expansion. To account for this thermal expansion, gaps are placed between the components. For example... Figure 1 As shown, there is a gap 22 between the outer peripheral surface of pin 14 and the inner peripheral surface of bushing 16. There is a gap 24 between the +X side end face of bushing 16 and the -X side end face of arm 18.

[0019] The surface 30 (first surface) of the bushing 16 opposite to the arm 18 is a concave curved surface toward the -X side. The surface 32 (second surface) of the arm 18 opposite to the bushing 16 is a convex curved surface toward the -X side. The arm 18 is pressed toward the -X side by the pressure of the exhaust gas. The surface 32 of the arm 18 contacts the surface 30 of the bushing 16.

[0020] Comparative example

[0021] Figure 2 This is a diagram illustrating the sealing structure 110 involved in the comparative example. A piston ring 15 is provided on the pin 14. The surface 30 of the bushing 16 opposite to the arm 18 and the surface 32 of the arm 18 opposite to the bushing 16 are perpendicular to the axis A. As described above, due to the gap 22 between the bushing 16 and the pin 14, the pin 14 may sometimes tilt. The arm 18 tilts together with the pin 14. The surface 32 of the arm 18 is not parallel to the surface 30 of the bushing 16.

[0022] In the comparative example, when pin 14 and arm 18 are tilted and arm 18 moves towards the -X side, surface 32 of arm 18 contacts surface 30 of bushing 16 in a point contact manner. Surface 32 and surface 30 do not fit tightly, and a gap 24 remains between these surfaces. Therefore, exhaust gas flows out to the outside of the exhaust pipe through gap 24 and gap 22.

[0023] According to the first embodiment, such as Figure 1 As shown, surface 30 of bushing 16 and surface 32 of arm 18 are curved surfaces. When arm 18 moves to the -X side, surface 32 is embedded into surface 30, and these surfaces are in close contact. Because surface 30 and surface 32 are in close contact, gap 24 is blocked. Because the arm 18 and bushing 16 are sealed, the outflow of exhaust gas can be suppressed.

[0024] Surfaces 30 and 32 are, for example, spherical or other curved surfaces. The radius of curvature of surface 30 can be the same as that of surface 32. By engaging surfaces 30 and 32, the sealing performance is improved. Since no additional parts such as sealing rings are required, costs are reduced and assemblability is improved.

[0025] The arm 18 is pressed against the -X side, so that surface 32 of the arm 18 contacts surface 30 of the bushing 16, and the arm 18 slides relative to the bushing 16. Processes can be performed to improve sliding and reduce friction between the surfaces. For example, surfaces 30 and 32 can be dotted or thermally sprayed.

[0026] <Second Implementation>

[0027] Figure 3(a) is a schematic diagram illustrating the sealing structure 200 according to the second embodiment. Description of the structure, which is the same as in the first embodiment, is omitted. The surface 30 of the bushing 16 and the surface 32 of the arm 18 have a tapered shape and taper towards the -X side.

[0028] According to the second embodiment, when the arm 18 moves towards the -X side, the conical surface 30 contacts the surface 32. This improves the sealing performance and suppresses the outflow of exhaust gas.

[0029] <Third Implementation>

[0030] Figure 3 (b) is a schematic diagram illustrating the sealing structure 300 according to the third embodiment. Descriptions of structures identical to those in the first or second embodiment are omitted. Part 42 is a component different from part 40 and is mounted on part 40. Part 40 is formed, for example, of an alloy such as stainless steel. Part 42 is formed, for example, of a copper-based metal.

[0031] According to the third embodiment, since part 42 is made of copper-based material, seizing can be prevented, and sliding performance is improved. The surface 32 of part 42 and the surface 30 of bushing 16 can be curved or conical. Sealing performance is improved.

[0032] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to this specific embodiment. Various modifications and alterations can be made within the scope of the spirit of the present invention as set forth in the claims.

[0033] Symbol Explanation

[0034] 10-rod, 11-wall, 12-connecting rod, 14-pin, 15-piston ring, 16-bulb, 18-arm, 20-valve, 22, 24-clearance, 30, 32-surface, 40, 42-part, 100, 110, 200, 300-sealing structure.

Claims

1. A sealing structure for a turbocharger, characterized in that, have: The drive shaft extends from the outside to the inside of the exhaust pipe; Bearings disposed around the drive shaft; and An arm, which is disposed inside the exhaust pipe, connected to the drive shaft, and rotates together with the drive shaft. The first surface of the bearing is opposite to the second surface of the arm. When the arm moves toward the bearing, the second surface comes into contact with the first surface. The first surface has either a curved surface or a conical shape. The second surface has one of a curved surface or a conical shape.

Images