JPH05936U - Supercharger for internal combustion engine - Google Patents

Abstract

(57) [Abstract] [Purpose] To effectively recirculate the cooling water in the cooling water jacket to enhance all the cooling effects on the bearing peripheral wall, and further on the turbine side peripheral wall and the compressor side peripheral wall. [Structure] The water inlet pipe 5 is projected into the cooling water jacket 8,
The ejection port 21 was bent in an L shape in the circumferential wall direction on the turbine side. Similarly, the drainage pipe 6 was projected, and the drainage port was bent in an L-shape toward the peripheral wall of the compressor. [Effect] Cooling water has an effect of sufficiently circulating in the cooling water jacket to enhance the cooling effect, and effectively cooling the turbine side and the bearing side peripheral wall of the highest temperature.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a supercharger having a water-cooled center housing, and more particularly to a supercharger having a water-cooled center housing suitable for enhancing a cooling effect of a bearing portion.

[0002]

[Prior Art]

 Conventionally, in a water-cooled center housing of a supercharger, when both the water inlet passage and the drainage passage were provided on one side of the center housing, when the cooling water filled the cooling water jacket, it was introduced from the water inlet passage. Since the cooling water does not smoothly flow back inside the cooling water jacket, it cannot be cooled sufficiently to the inner wall of the cooling water jacket and is immediately discharged from the drain passage. Therefore, the tip of the water inlet pipe was made to project into the cooling water jacket, but it still hits the peripheral wall and is drained from the drainage passage. In addition, the tip of the water inlet pipe was bent into an L shape on the turbine side. (Japanese Patent Application No. 1-166704) However, even with this, the turbine side peripheral wall can be cooled, but there is a problem that the entire bearing part is not cooled.

[0003]

[Problems to be solved by the device]

 The prior art does not consider the flow of cooling water in the water jacket of the water cooling center housing, and only one side is cooled, or it is not uniformly cooled. There was a problem that the peripheral wall of the cooling water jacket was not cooled sufficiently.

If the cooling is not sufficient, the heat conducted from the turbine side to the bearing part carbonizes and deposits organic substances in the oil adhering to the peripheral wall of the oil jacket to form sludge, which further increases sludge and increases the oil passage. May be blocked. This causes problems such as oil flowing out from the clearance between the bearing and the shaft to the turbine side and burning to generate white smoke. Similarly, organic matter in the oil is carbonized and accumulated around the clearance between the bearing and the radial metal, between the radial metal and the turbine shaft, and around them to form sludge, which damages the shaft and the radial metal bearing. Problems such as seizure occur.

An object of the present invention is to sufficiently recirculate the cooling water in the cooling water jacket to enhance the cooling effect of all of the bearing portion, the turbine side peripheral wall and the compressor side peripheral wall.

[0006]

[Means for Solving the Problems]

 The purpose of the above is to bend the tip of the inlet pipe of the water passage flange attached to the water cooling center housing into an L shape toward the turbine side peripheral wall, bend the tip of the drain pipe into the L shape toward the compressor side peripheral wall, and cool the water jacket. Let it protrude inside. As a result, the turbine side of the hottest part can be cooled, and moreover, the cooling water smoothly returns to the entire area of the cooling water jacket to achieve the purpose of improving the cooling effect.

[0007]

[Action]

 The cooling water introduced from the water inlet of the water passage flange flows out from the jet port at the tip of the water inlet pipe protruding into the cooling water jacket. The cooling water jetted from the jet outlet at the tip cools the turbine-side peripheral wall in front of the outlet evenly. After that, the water is further returned along the inner peripheral wall of the cooling water jacket, the peripheral wall is cooled, and discharged from the drainage passage to the outside of the cooling water jacket. As a result, the oil jacket peripheral wall in contact with the cooling water jacket peripheral wall is sufficiently cooled.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS.

A turbine impeller 18 driven by exhaust gas from an internal combustion engine, and a turbine case 17 including the turbine impeller 18. A turbine shaft 13 which is integral with the turbine impeller 18. A compressor impeller 20 fixed to the turbine shaft 13 and rotating integrally with the turbine impeller 18.

A compressor case 9 including a compressor impeller 20. A radial metal 12 that supports the turbine shaft 13 by being freely rotated around the outer circumference of the turbine shaft 13. A center housing 7 that holds the radial metal 12 and forms a bearing. Below the radial metal 12, an oil jacket 14 for receiving lubricating oil. A cooling water jacket 8 is formed above the oil jacket 14 with the oil jacket peripheral wall 11 as a boundary, which opens to one side in the horizontal direction of the center housing 7. An oil jacket peripheral wall 11 that divides the cooling water jacket 8 and the oil jacket 14. A water jacket peripheral wall 10 on the outer periphery of the center housing 7 of the cooling water jacket 8. A water inlet pipe 5 having a water inlet passage 2 for guiding the cooling water into the cooling water jacket 8 and having its tip end bent in an L shape so that the jet port 21 is projected to the vicinity of the turbine side peripheral wall 22. A drainage pipe 6 having a drainage passage 3 for discharging cooling water from the inside of the cooling water jacket 8, a tip bent into an L shape, and a drainage port 24 protruding to the vicinity of the compressor-side peripheral wall 23. A water passage flange 1 integrally provided with an inlet pipe 5 and a drain pipe 6. Set screw 4 for fixing the water passage flange 1 to the center housing 7.

In the above structure, the cooling water introduced into the cooling water jacket 8 from the water inlet passage 2 of the water passage flange 1 is jetted from the jet outlet 21 at the tip of the water inlet pipe 5. The cooling water ejected from the ejection port 21 hits the turbine-side peripheral wall 22 near the tip. Further, the cooling water flowing along the inner peripheral wall of the cooling water jacket 8 flows back inside the cooling water jacket 8 and is discharged to the outside of the cooling water jacket 8 from the drainage port 24 of the drainage passage 3 around the compressor side peripheral wall 23. To be done.

According to the present embodiment, the cooling water in the cooling water jacket 8 can flow, and is evenly distributed everywhere along the peripheral wall, so that the oil jacket peripheral wall 11 can be effectively cooled. is there. In particular, it is possible to sufficiently cool the turbine side peripheral wall, which has the highest temperature. As a result, the bearing portion and its peripheral portion are also sufficiently cooled.

[0013]

[Effect of the device]

 According to the present invention, the tip of the water inlet pipe protruding into the cooling water jacket is bent in the circumferential wall direction of the turbine, and the tip of the drain pipe is bent in the circumferential wall direction of the compressor so that the jet port and the drain port are oriented. The change can increase the flow to the turbine side, which requires cooling in particular. Further, since the drainage port is in the direction opposite to the jet port, the cooling water flows back along the peripheral walls in the cooling water jacket, so that a sufficient cooling effect can be obtained.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of FIG. 4 according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of FIG.

FIG. 3 is a vertical sectional view of a conventional structure.

FIG. 4 is an external view.

[Explanation of symbols]

1 ... water passage flange, 2 ... water inlet passage, 3 ... drainage passage, 5
… Inlet pipe, 6… Drain pipe, 7… Center housing, 8…
Cooling water jacket, 10 ... Water jacket peripheral wall, 11 ... Oil jacket peripheral wall, 21 ... Jet port, 22 ... Turbine side peripheral wall, 23 ... Compressor side peripheral wall, 24 ... Drainage port.

Claims (1)

Claims for utility model registration 1. A turbine impeller driven by exhaust gas of an internal combustion engine, a turbine case including the turbine impeller, a compressor impeller rotating integrally with the turbine impeller, and a compressor including the turbine impeller. A case, a water-cooled center housing in which a bearing portion of the turbine impeller forms an oil film floating bearing portion by radial oil through a radial metal, and a cooling water jacket is formed to cool the bearing portion with water, the cooling water Guide cooling water from the outside to the jacket,
Further, an inlet passage for draining water, and a water passage flange integrally holding the drain passage, an opening of a cooling water jacket provided on one side of the center housing, and the inlet pipe of the water passage flange and the tip of the drain pipe are In a turbocharger for an internal combustion engine that protrudes inside a water jacket, the tip of an inlet pipe is bent in an L shape toward the turbine and the tip of a drain pipe is bent into an L shape toward the compressor. Feeder.