WO2018123309A1

WO2018123309A1 - Turbo charger

Info

Publication number: WO2018123309A1
Application number: PCT/JP2017/041031
Authority: WO
Inventors: 和真原田
Original assignee: 大豊工業株式会社
Priority date: 2016-12-27
Filing date: 2017-11-15
Publication date: 2018-07-05
Also published as: JP2018105247A

Abstract

Provided is a turbocharger in which it is possible to minimize leaking of lubricating oil toward a compressor impeller. A turbocharger (1) is provided with: a rotating shaft (50) linking a compressor impeller (51) and a turbine impeller (52); a retainer (60) disposed between the compressor impeller (51) and the turbine impeller (52); a deflector (61) having a deflector main body (610) that is arranged in parallel with the turbine-impeller (52) side of the retainer (60) and that has a through-hole (610a) through which the rotating shaft (50) is inserted, and a tongue part (611) that extends from the lower edge of the deflector main body (610); a seal chamber (A) sectioned between the retainer (60) and the deflector (61); and a discharge port (B) that is sectioned between the tongue part (611) and the retainer (60) and that discharges lubricating oil from the seal chamber (A). The deflector main body (610), which is disposed between the through-hole (610a) and the discharge port (B), has a leak hole (610b) through which the seal chamber (A) and a space (901b) on the turbine-impeller (52) side of the seal chamber (A) communicate.

Description

Turbocharger

The present invention relates to a turbocharger including a deflector that suppresses leakage of lubricating oil to the compressor impeller side.

As shown in Patent Document 1, a rotating shaft of a turbocharger connects a compressor impeller and a turbine impeller. In the turbocharger, a thrust bearing, a deflector, and a retainer are arranged from the turbine impeller side toward the compressor impeller side. The rotating shaft is supported by a thrust bearing. The rotating shaft passes through the deflector and the retainer. A seal chamber is defined between the retainer and the deflector. The lubricating oil that has flowed into the seal chamber flows downward in the seal chamber due to its own weight. For this reason, lubricating oil tends to accumulate in the lower part of the seal chamber. Therefore, if the negative pressure on the compressor impeller side increases, the accumulated lubricating oil may leak to the compressor impeller side. In this respect, a vent hole is formed in the deflector of the turbocharger of the same document.

JP 07-217440 A

However, the vent hole is arranged on the upper side of the rotating shaft. That is, the portion where the lubricating oil tends to accumulate in the seal chamber (the lower portion of the seal chamber) and the vent hole are spaced apart from each other in the vertical direction with the rotation shaft interposed therebetween. On the other hand, the lubricating oil below the seal chamber leaks to the compressor impeller side through a gap near the outer peripheral surface of the rotating shaft. For this reason, even if the lubricating oil in the lower portion of the seal chamber is sucked up by the negative pressure on the compressor impeller side, it is difficult to discharge the lubricating oil through the vent hole. Thus, in the case of the turbocharger of the same document, it is difficult to suppress the leakage of the lubricating oil to the compressor impeller side. Accordingly, an object of the present invention is to provide a turbocharger capable of suppressing leakage of lubricating oil to the compressor impeller side.

In order to solve the above problems, a turbocharger according to the present invention includes a rotating shaft that connects a compressor impeller and a turbine impeller, a retainer disposed between the compressor impeller and the turbine impeller, and the turbine impeller of the retainer. A deflector body having a through-hole through which the rotating shaft is inserted, a tongue extending from a lower edge of the deflector body, and a partition between the retainer and the deflector A turbocharger that is partitioned between the sealing chamber and the tongue and the retainer, and that discharges lubricating oil from the sealing chamber, wherein the deflector body is vertically Seen from a direction orthogonal to the above, it is disposed between the through hole and the discharge port, the seal chamber, and the seal chamber And having a Bin'inpera side space, a leak hole for communicating the.

Hereinafter, the portion where the lubricating oil is likely to accumulate in the seal chamber is referred to as a “retention portion”. The leak hole is arrange | positioned at the deflector of the turbocharger of this invention. The leak hole is disposed below the through hole, that is, the rotating shaft. Moreover, the leak hole is arrange | positioned above the discharge port, ie, a retention part. For this reason, even if the lubricating oil in the staying portion is sucked up by the negative pressure on the compressor impeller side, the lubricating oil can be discharged through the leak hole. Further, air is sucked into the seal chamber through the leak hole due to the negative pressure on the compressor impeller side. For this reason, the suction force exerted by the negative pressure on the lubricating oil in the staying portion can be reduced.

FIG. 1 is an axial sectional view of a turbocharger according to an embodiment of the present invention. FIG. 2 is an enlarged view in the frame II of FIG. FIG. 3 is a rear view of the seal portion of the turbocharger. FIG. 4A is an axial cross-sectional view of the vicinity of a tongue portion of a deflector of a turbocharger according to another embodiment (part 1). FIG.4 (b) is an axial sectional view of the vicinity of the tongue portion of the deflector of the turbocharger of the other embodiment (part 2).

Hereinafter, embodiments of the turbocharger of the present invention will be described.

<Turbocharger configuration>
First, the configuration of the turbocharger of this embodiment will be described. In the following figures, the front side corresponds to the “compressor impeller side” of the present invention, the rear side corresponds to the “turbine impeller side” of the present invention, and the left-right direction corresponds to the “direction perpendicular to the vertical direction” of the present invention. is doing. FIG. 1 shows an axial sectional view of the turbocharger of the present embodiment. As shown in FIG. 1, the turbocharger 1 of the present embodiment includes a journal bearing 3, a thrust bearing 4, a rotating part 5, a seal part 6, a bearing housing 90, a compressor housing 91, and a turbine housing 92. It is equipped with.

In the bearing housing 90, oil passages 901a and 901b, bearing housing portions 902a and 902b, and a retainer housing portion 903 are formed. The oil passage 901b is included in the concept of “a space on the turbine impeller side of the seal chamber” of the present invention. Lubricating oil flows through the oil passages 901a and 901b. When viewed from the front side (one axial direction) or the rear side (the other axial direction), the bearing housing portion 902 a is disposed at the radial center of the bearing housing 90. The retainer accommodating portion 903 is recessed in the front surface of the bearing housing 90. The bearing housing portion 902b is connected to the rear side of the retainer housing portion 903.

The journal bearing 3 has a cylindrical shape. The journal bearing 3 is accommodated in the bearing accommodating portion 902a. The thrust bearing 4 has a disk shape with the lower portion removed. The thrust bearing 4 is accommodated in the bearing accommodating portion 902b. The compressor housing 91 is disposed on the front side of the bearing housing 90. The turbine housing 92 is disposed on the rear side of the bearing housing 90.

The rotating part 5 is rotatable with respect to the bearing housing 90. The rotating unit 5 includes a rotating shaft 50, a compressor impeller 51, a turbine impeller 52, a thrust collar 53, and a color turbo seal ring 54.

The rotating shaft 50 penetrates the bearing housing 90 in the front-rear direction (axial direction). The rotating shaft 50 is rotatably supported by the journal bearing 3 from the radially outer side. The compressor impeller 51 is attached to the front end of the rotating shaft 50. The turbine impeller 52 is connected to the rear end of the rotary shaft 50. That is, the rotating shaft 50 connects the compressor impeller 51 and the turbine impeller 52. The thrust collar 53 is attached to the outer peripheral surface of the rotating shaft 50. The thrust collar 53 is rotatably supported by the thrust bearing 4 from the axial direction. The color turbo seal ring 54 is disposed on the front side of the thrust collar 53. The color turbo seal ring 54 is attached to the outer peripheral surface of the rotating shaft 50.

FIG. 2 shows an enlarged view in the frame II of FIG. FIG. 3 shows a rear view of the seal portion of the turbocharger of the present embodiment. As shown in FIGS. 2 and 3, the seal portion 6 includes a retainer 60 and a deflector 61. The retainer 60 is disposed in the retainer accommodating portion 903 of the bearing housing 90. The retainer 60 has a bottomed cylindrical shape that opens to the rear side. The retainer 60 includes a bottom wall portion 600 and a peripheral wall portion 601. An O-ring 601a is disposed between the peripheral wall portion 601 and the retainer accommodating portion 903. A boss portion 600 a is disposed at the radial center of the bottom wall portion 600. A color turbo seal ring 54 is rotatably disposed inside the boss portion 600a in the radial direction. A gap H is defined between the boss portion 600 a and the color turbo seal ring 54. In the gap H, a ring seal 600b is disposed. The ring seal 600b is in pressure contact with the inner peripheral surface of the boss portion 600a. A seal chamber A is defined between the retainer 60 and a deflector 61 described later. In the lower part of the seal chamber A, a staying part C exists. Lubricating oil O tends to accumulate in the staying part C.

The deflector 61 includes a deflector body 610 and a tongue 611. The deflector body 610 covers the seal chamber A from the rear side. The outer peripheral edge of the deflector body 610 is fitted to the rear edge of the peripheral wall portion 601 from the radially inner side. The deflector body 610 includes a through hole 610a, a leak hole 610b, a guard rib 610c, and a step portion 610d. The through hole 610a is opened at the center of the deflector body 610 in the radial direction. A color turbo seal ring 54 is rotatably disposed inside the through hole 610a in the radial direction. When viewed from the left-right direction (right side or left side), the leak hole 610b is disposed between the upper through hole 610a, the lower discharge port B, and the retention portion C. The leak hole 610b communicates the seal chamber A and the oil passage 901b. When viewed from the left-right direction, the guard rib 610c is disposed between the upper through hole 610a and the lower discharge port B and staying portion C. The guard rib 610c protrudes from the upper edge of the leak hole 610b to the front side (the seal chamber A side). The guard rib 610c extends in the left-right direction (a direction orthogonal to the direction in which the lower discharge port B and the upper gap H are communicated). When viewed from the left-right direction, the step portion 610d is disposed between the upper through-hole 610a and the lower discharge port B and staying portion C. The lower end of the step portion 610d is disposed on the front side with respect to the upper end of the step portion 610d. For this reason, the step part 610d extends from the rear upper side to the front lower side. The leak hole 610b is formed in the step 610d. The upper edge of the leak hole 610b coincides with the upper edge of the step portion 610d.

The tongue portion 611 extends from the lower edge of the deflector body 610 to the rear lower side (oil passage 901b side). That is, the tongue 611 extends from the front upper side to the rear lower side. A discharge port B is defined between the tongue 611 and the lower part of the rear edge of the peripheral wall 601. The discharge port B is disposed on the rear side (oil path 901b side) of the staying part C. The seal chamber A and the oil passage 901b communicate with each other through the discharge port B.

<Seal movement>
Next, the movement of the seal part of the turbocharger of this embodiment will be described. As shown in FIG. 1, when the turbocharger 1 is driven, that is, when the rotating unit 5 is rotated, the lubricating oil is supplied to the journal bearing 3 and the thrust bearing 4 via the oil passage 901a. The lubricating oil used in the journal bearing 3 and the thrust bearing 4 is discharged from the bearing housing 90 via the oil passage 901b.

As shown in FIG. 2, a part of the used lubricating oil passes through a gap between the deflector 61 and the retainer 60, a gap between the through hole 610a and the collar turbo seal ring 54, a discharge port B, and the like. , Flows into the seal chamber A. The lubricating oil O that has flowed into the seal chamber A joins the lower portion of the seal chamber A due to its own weight. That is, the lubricating oil O stays in the staying part C. The lubricating oil O in the staying part C flows out to the oil passage 901b through the discharge port B.

When negative pressure is generated on the compressor impeller 51 side, air and lubricating oil O easily flow from the seal chamber A to the compressor impeller side through the gap H. Here, in the vicinity of the discharge port B, a staying portion C exists. For this reason, the opening area of the discharge port B is reduced by the lubricating oil O in the staying part C. Therefore, it becomes difficult for air to flow from the oil passage 901b into the seal chamber A through the discharge port B. Therefore, the lubricating oil O in the stay part C is easily sucked up by the negative pressure on the compressor impeller 51 side. That is, the lubricating oil O in the staying portion C is likely to leak to the compressor impeller 51 side via the gap H.

In this respect, as shown in FIGS. 2 and 3, the deflector body 610 has a leak hole 610b. Therefore, as indicated by the arrow Y1 in FIG. 2, the lubricating oil O sucked up from the staying portion C can be discharged to the oil passage 901b through the leak hole 610b. Further, as indicated by an arrow Y2 in FIG. 2, air can be introduced from the oil passage 901b to the seal chamber A through the leak hole 610b. In addition, a guard rib 610 c is disposed on the deflector body 610. For this reason, as shown by the arrow Y3 in FIG. 2, the lubricating oil O sucked up from the stay part C can collide with the guard rib 610c. That is, the flow of the lubricating oil O can be blocked. Further, the deflector body 610 is provided with a step portion 610d. For this reason, as indicated by an arrow Y4 in FIG. 2, the lubricating oil O flowing down the rear surface (surface) of the deflector body 610 can be prevented from flowing into the seal chamber A via the leak hole 610b.

<Effect>
Next, the effect of the turbocharger of this embodiment is demonstrated. As shown in FIGS. 2 and 3, a leak hole 610 b is disposed in the deflector 61. When viewed from the left-right direction, the leak hole 610b is disposed below the through-hole 610a, that is, the rotation shaft 50. Further, the leak hole 610b is disposed above the discharge port B, that is, the staying portion C as viewed from the left-right direction. For this reason, even if the lubricating oil O in the staying portion C is sucked up by the negative pressure on the compressor impeller 51 side, the lubricating oil O is discharged through the leak hole 610b as shown by the arrow Y1 in FIG. Can do. Further, as indicated by an arrow Y2 in FIG. 2, air is sucked from the oil passage 901b into the seal chamber A through the leak hole 610b due to the negative pressure on the compressor impeller 51 side. For this reason, the suction force exerted by the negative pressure on the lubricating oil O in the staying portion C can be reduced.

Further, as shown in FIG. 2, a guard rib 610 c is disposed on the deflector body 610. The guard rib 610c is disposed below the through-hole 610a, that is, the rotation shaft 50 as viewed from the left-right direction. Further, the guard rib 610c is disposed above the discharge port B, that is, the staying portion C as viewed from the left-right direction. Therefore, as indicated by an arrow Y3 in FIG. 2, when the lubricating oil O in the staying portion C is sucked by the negative pressure on the compressor impeller 51 side, the suction of the lubricating oil O can be obstructed by the guard rib 610c. .

Further, as shown in FIG. 2, the deflector body 610 is provided with a step 610d. The lower end of the step portion 610d is disposed on the front side with respect to the upper end of the step portion 610d. That is, in the deflector body 610, the portion below the step portion 610d is shifted to the front side with respect to the portion above the step portion 610d. The upper edge of the leak hole 610b is arranged at a position (the same position as the upper edge or a position lower than the upper edge) below the upper edge of the step portion 610d. For this reason, as indicated by an arrow Y4 in FIG. 2, the lubricating oil O flowing down the rear surface of the deflector body 610 can be suppressed from flowing into the seal chamber A via the leak hole 610b.

Further, as shown in FIG. 2, the lower surface of the guard rib 610c (the collision surface on which the sucked lubricating oil O collides) is not directly below, but is directed to the rear lower side (leak hole 610b side). For this reason, it is easy to introduce the lubricating oil O reflected by the guard rib 610c into the leak hole 610b.

<Others>
The embodiment of the turbocharger of the present invention has been described above. However, the embodiment is not particularly limited to the above embodiment. Various modifications and improvements that can be made by those skilled in the art are also possible.

FIG. 4A shows an axial sectional view of the vicinity of the tongue portion of the deflector of the turbocharger of the other embodiment (part 1). FIG. 4B is an axial sectional view of the vicinity of the tongue portion of the deflector of the turbocharger according to another embodiment (part 2). In addition, about the site | part corresponding to FIG. 2, it shows with the same code | symbol. Moreover, the site | part shown to Fig.4 (a) and FIG.4 (b) is a site | part corresponding to the frame IV of FIG.

As shown in FIG. 4A, the guard rib 610c may protrude from the lower edge of the leak hole 610b to the front side (the seal chamber A side). In this way, the lubricating oil O reflected by the guard rib 610c can be returned to the staying part C as indicated by the arrow Y5.

As shown in FIG. 4B, the guard rib 610c may be disposed above the step portion 610d. Further, the leak hole 610b may be disposed below the step portion 610d. That is, the leak hole 610b, the guard rib 610c, and the step portion 610d may be arranged independently of each other. In this way, as indicated by the arrow Y6, a part of the lubricating oil O reflected by the guard rib 610c can be returned to the staying part C. Further, the remaining portion of the lubricating oil O reflected by the guard rib 610c can flow out to the oil passage 901b through the leak hole 610b.

The shape, size, position, and number of arrangement of the leak hole 610b, the guard rib 610c, and the step portion 610d are not particularly limited. The leak hole 610b may have a slit shape, a square shape, an oval shape, a perfect circle shape, or the like when viewed from the front side or the rear side. The guard rib 610c may have a linear shape extending in the left-right direction or a partial arc shape (C-shape) projecting upward as viewed from the front side or the rear side.

As shown in FIG. 2, when the guard rib 610c is disposed along the upper edge of the leak hole 610b, the lateral length of the guard rib 610c may be greater than or equal to the lateral length of the upper edge of the leak hole 610b. In this way, it is easy to introduce the lubricating oil O reflected by the guard rib 610c into the leak hole 610b. As shown in FIG. 4A, when the guard rib 610c is disposed along the lower edge of the leak hole 610b, the left-right length of the guard rib 610c may be equal to or longer than the left-right length of the lower edge of the leak hole 610b. . As a result, the lubricating oil O sucked up from the staying portion C indicated by arrows Y1 and Y5 in FIG. 4 and the air introduced into the seal chamber A via the leak hole 610b indicated by arrow Y2 in FIG. Hard to mix. As shown in FIG. 2, the protrusion angle θ1 of the guard rib 610c with respect to the upper portion of the step portion 610d is not particularly limited. It may be obtuse or acute.

The rear surface of the step portion 610d may be flat or curved. The protrusion angle θ2 of the step portion 610d with respect to the upper portion of the step portion 610d is not particularly limited. It may be obtuse or acute. Further, at the time of manufacturing the deflector 61, when the leak hole 610b is opened (cut out) in the deflector body 610, a part of the hole edge of the leak hole 610b is left and the remaining part is cut and the part is curved. The guard rib 610c may be manufactured. Further, the guard rib 610c may be disposed on the rear surface (the surface on the seal chamber A side) of the bottom wall portion 600.

1: turbocharger, 3: journal bearing, 4: thrust bearing, 5: rotating part, 6: seal part, 50: rotating shaft, 51: compressor impeller, 52: turbine impeller, 53: thrust collar, 54: color turbo seal Ring, 60: Retainer, 61: Deflector, 90: Bearing housing, 91: Compressor housing, 92: Turbine housing, θ1: Projection angle, θ2: Projection angle, 600: Bottom wall, 600a: Boss, 600b: Ring seal 601: peripheral wall portion, 601a: O-ring, 610: deflector body, 610a: through hole, 610b: leak hole, 610c: guard rib, 610d: stepped portion, 611: tongue portion, 901a: oil passage, 901b: oil passage, 902a: bearing housing portion, 902b: bearing housing portion, 903: retainer housing portion, A: Seal chamber, B: Discharge port, C: Residence part, H: Clearance, O: Lubricating oil

Claims

A rotating shaft connecting the compressor impeller and the turbine impeller;
A retainer disposed between the compressor impeller and the turbine impeller;
A deflector body provided side by side on the turbine impeller side of the retainer and having a through hole through which the rotating shaft is inserted; and a tongue portion extending from a lower edge of the deflector body;
A seal chamber defined between the retainer and the deflector;
A discharge port that is partitioned between the tongue and the retainer and discharges lubricating oil from the seal chamber;
A turbocharger comprising:
The deflector body is disposed between the through hole and the discharge port when viewed from a direction perpendicular to the vertical direction, and communicates the seal chamber and the space on the turbine impeller side of the seal chamber. A turbocharger characterized by having a leak hole.
The turbocharger according to claim 1, wherein the deflector body includes a guard rib that is disposed between the through hole and the discharge port and protrudes toward the seal chamber.
The deflector body has a stepped portion with a lower end disposed on the compressor impeller side with respect to the upper end,
The turbocharger according to claim 1 or 2, wherein an upper end of the leak hole is disposed at a position below the upper edge of the stepped portion.