JPH0579344A - Water-cooled bearing housing structure of supercharger - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a water-cooled bearing housing structure for a supercharger, which can be made compact by changing the arrangement of cooling water inlets and outlets and can achieve uniform cooling. [Structure] A cooling water jacket 31 surrounding the entire circumference of a turbine shaft 5 formed in a bearing housing 3 supplies and discharges the cooling water from an inlet 32 and an outlet 33 of the cooling water formed on both sides above the turbine shaft 5, respectively. The difference in the flow path resistance between the upper side and the lower side of the jacket 31 is adjusted by the projection 38 of the resistance member 36 which is provided on the upper side of the cooling water jacket 31 and the flow path 37 is secured on the upper side so that air does not stay. By shifting the cooling water inlet 32 and the outlet 33 upward, the position is shifted from the maximum width portion of the bearing housing 3 to be compact,
Uniform cooling can be achieved by adjusting the flow path resistance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-cooled bearing housing structure for a supercharger, which is designed to be compact by changing the arrangement of cooling water inlets and outlets and to enable uniform cooling.

[0002]

2. Description of the Related Art There is an exhaust turbine supercharger (turbocharger) as one of superchargers, which uses the energy of exhaust gas from an engine to rotate a turbine and drive a compressor mounted on a turbine shaft. By supercharging the intake air, the output performance of the engine is improved.

There are various types of turbochargers. In a typical automobile turbocharger, a central portion of a turbine shaft is supported by bearings, and a turbine and a compressor are arranged at both ends of the turbine shaft. And is configured as shown in FIG. 6, for example.

The turbocharger 1 is provided with three housings 2, 3 and 4. A turbine 6 is arranged at one end of a turbine shaft 5 in the turbine housing 2 and a compressor casing 4 of the turbine shaft 5 is provided. The compressor 7 is arranged at the other end, and the central portion of the turbine shaft 5 is rotatably supported by the bearing portion 8 of the bearing housing 3 in the middle portion.

The bearing portion 8 of the bearing housing 3 includes, for example, floating metal 9, 1 for two journals.
0 is arranged on the turbine side and the compressor side, and a thrust metal 11 is further provided on the compressor side.
Then, for lubrication of the bearing portion 8, an oil supply port 12 is formed in the upper portion of the bearing housing 3, and the lubricating oil is supplied to the respective metals 9 to 11 by the oil passage 13, and the oil drain hole 14 and the drain oil hole 14 in the lower portion of the bearing housing 3 are provided. The oil is collected from the oil drain port 15 to the outside of the turbocharger 1. Further, the turbocharger 1 is provided with an oil seal structure 16 because it is necessary to seal lubricating oil for lubricating the bearing portion 8. The oil seal structure 16 is fitted to the turbine shaft 5 and is provided on the outer periphery thereof.
The large and small piston rings 18 and 19 are mounted in one groove, while the seal plate 20 is fixedly mounted on the bearing housing 3, and the piston rings 18 and 19 are slidably contacted with the inner peripheral surface of the seal plate 20. ..

In such a turbocharger 1, in order to increase the heat load and improve reliability, it is necessary to protect the bearing portion 8, particularly the metal 9 on the turbine 6 side, from heat such as exhaust gas transmitted to the bearing housing 3. ..

Therefore, cooling is performed by flowing cooling water (Japanese Patent Publication No. Sho 62-17095, etc.), and FIG.
As shown in FIG. 8, an annular cooling water jacket 21 is formed on the turbine side of the bearing housing 3 so as to surround the turbine shaft 5, and the turbine shaft 5 at the central portion in the axial direction of the bearing housing 3 is formed.
Cooling water inlet 22 and cooling water outlet 2 on both sides of the same height as
3 is formed, and the cooling water supplied from the cooling water inlet 22 is split from the side of the cooling water jacket 21 up and down to flow, and is guided to the cooling water outlet 23 from the side opposite to the cooling water jacket 21. It is designed to be cooled during discharge.

[0008]

In such a cooling structure for the bearing housing 3, the cooling water inlet 22 for supplying and discharging the cooling water to and from the cooling water jacket 21 formed in an annular shape around the entire circumference of the turbine shaft 5 and the cooling water. The outlets 23 are arranged on both sides of the bearing housing 3 at substantially the same height as the turbine shaft 5, but this portion is the maximum width portion of the bearing housing 3,
As shown in FIG. 7, from the cooling water inlet 22 to the cooling water outlet 23
The distance L1 to is increased.

Therefore, the cooling water inlet 22 and the cooling water outlet 2
It is conceivable to shift 3 above and below the center of the turbine shaft 5 of the bearing housing 3, thereby making it possible to make the distance L1 from the cooling water inlet 22 to the cooling water outlet 23 compact.

However, it is necessary to form an oil discharge hole 14 for lubricating oil that lubricates the bearing portion 8 in the lower portion of the bearing housing 3, and the fact that the inlet / outlet of cooling water is shifted downward is a structural problem. This causes problems such as complication and increase of the return resistance of lubricating oil.

On the other hand, when the inlet / outlet positions of the cooling water to the cooling jacket 21 are shifted upward, the cooling water divided and flowing in the cooling jacket flows only to the upper side where the flow path resistance is small, and the cooling on the lower side is unsuccessful. There is a problem that the cooling becomes sufficient and uniform cooling cannot be performed.

Further, a request for changing the arrangement of the cooling water inlet / outlet may occur not only due to the distance between the cooling water inlet and the outlet but also due to the convenience of mounting on the engine. The problem arises.

The present invention has been made in view of the above-mentioned problems of the prior art, and it is possible to reduce the size of the supercharger by changing the arrangement of the inlet and the outlet of the cooling water, and to achieve uniform cooling. The present invention seeks to provide a water-cooled bearing housing structure.

[0014]

In order to solve the above problems, in the water-cooled bearing housing structure of the supercharger of the present invention, the central portion of the turbine shaft having the turbine and the compressor at both ends is provided in the bearing housing. In a supercharger rotatably supported by bearings, a cooling water jacket surrounding the entire circumference of the turbine shaft is formed in the bearing housing, and cooling water inlets and outlets for supplying and discharging cooling water are provided in the cooling water jacket. A bearing member is formed on both sides of the turbine shaft across the bearing shaft and above the turbine shaft, while a flow passage is formed on the upper side to provide a resistance member for adjusting the flow passage resistance above and below the cooling water jacket. It is a feature.

[0015]

According to the structure of the water-cooled bearing housing of the supercharger, the cooling water jacket surrounding the entire circumference of the turbine shaft formed in the bearing housing has cooling water inlets and outlets formed on both sides above the turbine shaft. The flow resistance of the upper and lower sides of the cooling water jacket is adjusted by adjusting the resistance on the upper side of the cooling water jacket and on the upper side of the cooling water jacket with a resistance member that prevents air retention. ing.

Therefore, the inlet and outlet of the cooling water are not formed in the maximum width portion of the bearing housing, but the gap can be made compact by displacing them upward, and the flow resistance of the cooling water divided by the resistance member can be achieved. Can be adjusted for uniform cooling.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. 1 to 3 relate to an embodiment of a water-cooled bearing housing structure of a supercharger of the present invention, FIG. 1 (a) is an overall longitudinal sectional view, and FIG. 1 (b) is an AA sectional view in FIG. 2 is a sectional view taken along the line BB (DD in FIG. 3) in FIG. 1, and FIG. 3 is a view taken in the direction of arrow C in FIG. The same parts as those of the turbocharger described with reference to FIG. In the water-cooled bearing housing structure 30 of this supercharger, as shown in FIGS. 1 to 3, an annular cooling water jacket 31 is formed on the turbine side of the bearing housing 3 so as to surround the entire circumference of the turbine shaft 5.

In order to supply and discharge the cooling water to and from the cooling water jacket 31, cooling water inlets 32 and cooling water outlets 33 are formed above the center of the turbine shaft 5 on both sides of the axial center of the bearing housing 3. Is a cross-flow type (type in which cooling water flows in and out perpendicularly to the turbine shaft 5), and the cooling water jacket 31 and the cooling water inlet 32 and the cooling water outlet 33 have an inlet communication passage 34 parallel to the turbine shaft 5.
And the outlet communication passage 35. As shown in FIG. 2, the distance L between the cooling water inlet 32 and the cooling water outlet 33 formed in the bearing housing 3 is smaller than the maximum width portion of the bearing housing 3 (L <See L1 FIG. 7). Therefore, the cooling water is supplied to the annular cooling water jacket 31 as shown in FIG.
As shown in (b) and FIG. 2, the inflow and the outflow are performed from both sides of the turbine shaft 5 which are deviated considerably above the center position.

For this reason, the cooling water flowing into the cooling water jacket 31 from the inlet communication passage 34 is divided into upper and lower flows, then merges and is discharged through the outlet communication passage 35 and the cooling water outlet 33. The lengths of the upper and lower flow paths in the cooling water jacket 31 are significantly different from each other, and the cooling water flows unevenly toward the upper side where the flow path resistance is low, and uniform cooling cannot be performed. Therefore, a resistance member 36 for adjusting the flow path resistance above and below the cooling water jacket 31 is provided above the cooling water jacket 31.

The resistance member 36 for adjusting the flow path resistance is
For example, as shown in FIG. 1, a flow path 37 through which cooling water passes is secured on the upper side, and a lower side is formed as a projection 38 integrated with the bearing housing 3. The height of the protrusion 38 and the cross-sectional area of the flow path 37 are designed so that the amount of cooling water flowing vertically is substantially uniform.

When the resistance member 36 is provided in this way,
By ensuring that the flow path 37 is provided above the cooling water jacket 31, even if boiling occurs in the cooling water and air or the like is generated, the projections 38 do not hinder the discharge, and the flow path 37
It can be discharged smoothly from the part.

As the resistance member 36, as shown in FIG. 4, a passage 37 is secured on the turbine side above the cooling water jacket 31, and a protrusion 38 is formed on the compressor side so as to project laterally. The flow path 37 is formed so as not to project downward from the upper side so as to form no protrusion, and the flow path resistance is adjusted, and at the same time, the generated boiling air can be discharged smoothly.

Further, as another embodiment of the resistance member 36, as shown in FIG. 5, a triangular flow path 37 including a side wall and an upper wall on the turbine side is provided above the cooling water jacket 31.
Is ensured and the triangular protrusion 38 including the side wall and the lower wall on the compressor side is formed so that the boiler air can be easily discharged while adjusting the flow path resistance. Since the configuration of the other turbocharger 1 is the same as that of FIG. 6 already described, the description thereof will be omitted.

According to the water-cooled bearing housing structure 30 of the supercharger constructed as described above, cooling is performed as follows. Part of the cooling water of the engine cooling system is the cooling water inlet 32.
When it is supplied to the turbocharger 1 from the cooling water, the cooling water horizontally flows at a right angle to the turbine shaft 5, and then the inlet communication passage 34
The water flows from above the turbine shaft 5 of the cooling water jacket 31 toward the turbine side.

The cooling water flowing from above the turbine shaft 5 of the cooling water jacket 31 is divided into upper and lower parts by the inner wall of the cooling water jacket 31 and flows, but the upper and lower flow path resistances are adjusted by the resistance member 36. The cooling water jacket 31 flows evenly above and below the cooling water jacket 31, so that the entire circumference of the cooling water jacket 31 can be cooled substantially uniformly.

In this way, the cooling water, which has been split into the cooling jacket 31 and flows vertically, is merged on the opposite side, and then the turbocharger 1 is passed through the outlet communication passage 35 and the cooling water outlet 33.
It is discharged outside. Therefore, even if the cooling water inlet 32 and the cooling water outlet 33 are arranged above the center positions on both sides of the turbine shaft 5, uniform cooling can be performed and the cooling water inlet 3
The distance L from 2 to the cooling water outlet 33 can be made smaller than that in the case where the distance L is formed near the center of the turbine shaft 5,
Can be made compact.

Further, since the resistance member 36 for adjusting the flow path resistance is provided so as to open the upper side of the flow path 37, it is possible to easily discharge the boiling air. In the above embodiments, the supercharger for automobiles has been described as an example, but the present invention is not limited to this and can be widely applied as a water-cooled bearing housing structure of other superchargers. Further, each constituent element may be modified within the scope of the invention.

[0028]

According to the water-cooled bearing housing structure of the supercharger of the present invention as specifically described above with reference to one embodiment, the turbine is formed in the cooling water jacket surrounding the entire circumference of the turbine shaft formed in the bearing housing. Cooling water is supplied and discharged from the cooling water inlet and outlet formed on both sides above the axis, and the difference in flow path resistance between the upper and lower sides of the cooling water jacket is secured in the upper part of the cooling water jacket and in the upper side. Since it is adjusted with a resistance member that prevents air from staying, it is possible to achieve compactness by shifting upward without forming the inlet / outlet of cooling water in the maximum width portion of the bearing housing, The flow resistance of the cooling water branched by the resistance member can be adjusted, and uniform cooling can be performed.

Further, a resistance member is formed on the upper side of the cooling water jacket so as to secure a flow path, and the resistance member does not hinder the discharge of the boiling air.
It can be discharged smoothly.

[Brief description of drawings]

FIG. 1 is an overall vertical sectional view and an AA sectional view according to an embodiment of a water-cooled bearing housing structure of a supercharger of the present invention.

FIG. 2 is a sectional view taken along the line BB (DD in FIG. 3) in FIG. 1 according to an embodiment of the water-cooled bearing housing structure of the supercharger of the present invention.

FIG. 3 is a view taken in the direction of arrow C in FIG. 2 according to an embodiment of the water-cooled bearing housing structure of the supercharger of the present invention.

FIG. 4 is a partial cross-sectional view of another embodiment of the water-cooled bearing housing structure of the supercharger of the present invention.

FIG. 5 is a partial cross-sectional view of still another embodiment of the water-cooled bearing housing structure of the supercharger of the present invention.

FIG. 6 is an overall vertical sectional view of a conventional water-cooled bearing housing structure of a supercharger.

FIG. 7 is a view of a conventional water-cooled bearing housing structure of a supercharger.
FIG. 9 is a sectional view taken along the line AA (C-C in FIG. 8).

FIG. 8 is a view of a conventional water-cooled bearing housing structure of a supercharger.
FIG.

[Explanation of symbols]

 1 Turbocharger (Turbocharger) 2 Turbine housing 3 Bearing housing 4 Compressor housing 5 Turbine shaft 6 Turbine 7 Compressor 8 Bearing part 9,10 Floating metal 11 Thrust metal 12 Oil supply port 13 Oil passage 14 Oil discharge hole 15 Oil discharge port 30 Water cooling bearing housing structure of supercharger 31 Cooling water jacket 32 Cooling water inlet 33 Cooling water outlet 34 Inlet communication passage 35 Outlet communication passage 36 Resistance member 37 Flow passage 38 Protrusion

Claims (1)

[Claims] 1. A supercharger in which a central portion of a turbine shaft having a turbine and a compressor provided at both ends thereof is rotatably supported by a bearing provided in a bearing housing, wherein the bearing housing covers the entire circumference of the turbine shaft. An enclosing cooling water jacket is formed, and an inlet and an outlet for supplying and discharging the cooling water to and from the cooling water jacket are formed on both sides of the turbine shaft in the bearing housing and above the turbine shaft, while the upper flow path is formed. A water-cooled bearing housing for a supercharger, characterized in that a flow path is formed above the cooling water jacket, and a resistance member for adjusting the ratio of flow path resistances of the upper flow path and the lower flow path is provided above the cooling water jacket. Construction.