JP2014034957A - Bearing housing for supercharger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing housing for a supercharger capable of combining reduction of a weight and assurance of heat resistance.SOLUTION: A bearing housing 1 includes: a compressor impeller 41 at a compressor side X; journals a rotating shaft 4 including a turbine impeller 42 at a turbine side Y, and has a water jacket 12 formed on an outer periphery of the rotating shaft 4. The bearing housing 1 includes: an aluminum bearing body portion 2; and an iron cap portion 3 covering the turbine side Y of the bearing body portion 2. The bearing body portion 2 is provided with a body shaft hole 21 axially penetrated to insert the rotating shaft 4, and a body recessed portion 22 formed on an outer periphery of the body shaft hole 21 and having an opening portion 220 opened toward the turbine side Y. The cap portion 3 is mounted at the turbine side Y of the bearing body portion 2 to close the opening portion 220 of the body recessed portion 22, and configures the water jacket 12 with the body recessed portion 22.

Description

  The present invention relates to a bearing housing for a supercharger that supports a rotary shaft provided with a compressor impeller and a turbine impeller.

A supercharger in an internal combustion engine includes a compressor impeller on the compressor side, and a rotating shaft having a turbine impeller on the turbine side is supported by a bearing housing.
A water jacket serving as a passage through which cooling water flows is formed inside the conventional bearing housing, and is prevented from being heated to a high temperature by the heat of exhaust gas passing through the turbine impeller. An example of such a supercharger is disclosed in Patent Document 1.

JP 2009-243299 A

  However, since the conventional bearing housing is made of iron using cast iron or the like, there is a problem that the mass is large. Therefore, it is conceivable to reduce the overall weight by making the bearing housing made of aluminum. However, if the bearing housing is made of aluminum, the heat resistance will be lower than that of iron. In particular, there is a risk that sufficient heat resistance cannot be ensured against the heat from the turbine side as described above.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a bearing housing for a supercharger that achieves both weight reduction and heat resistance.

The present invention is for a supercharger having a compressor jacket on one side in the axial direction and a rotating shaft having a turbine impeller on the other side in the axial direction and having a water jacket formed on the outer periphery of the rotating shaft. In the bearing housing,
The bearing housing includes an aluminum bearing main body and an iron cap that covers the other axial side of the bearing main body.
The bearing main body portion has a main body shaft hole that penetrates in the axial direction and through which the rotating shaft is inserted, and is formed on the outer periphery of the main body shaft hole and opens toward the other side in the axial direction. A body recess having an opening is provided,
The cap portion is attached to the other axial side of the bearing body portion so as to close the opening of the body recess portion, and constitutes the water jacket between the body recess portion. It is in the bearing housing for the supercharger which is characterized (Claim 1).

  The said bearing housing is comprised by the bearing main-body part made from aluminum, and the cap part made from iron. That is, in the bearing housing, a bearing main body portion that is a portion that mainly supports the rotating shaft is made of aluminum. Therefore, the mass can be reduced as compared with the case where the entire bearing housing is made of iron. Thereby, weight reduction of a bearing housing is realizable.

In addition, since the bearing housing is made of aluminum, the bearing housing can be easily processed such as cutting the bearing body. Therefore, the bearing housing can be easily manufactured and the manufacturing cost can be reduced.
The bearing housing covers the other axial side of the bearing main body made of aluminum (hereinafter referred to as the turbine side as appropriate) with an iron cap. Here, the turbine side of the bearing housing is particularly susceptible to the effects of exhaust gas heat. Therefore, by arranging the cap part mainly composed of iron, which is more heat resistant than aluminum, on the turbine side of the bearing housing, combined with the cooling effect by the cooling water circulating in the water jacket, the heat from the turbine side In contrast, sufficient heat resistance can be ensured.

  Moreover, the said bearing housing comprises the water jacket by closing the opening part of the main-body recessed part of a bearing main-body part with a cap part. For example, when the space constituting the water jacket is formed by casting or the like inside a single-piece bearing housing, a core and a baseboard are required at the time of molding. However, in the above structure, the main body concave portion of the bearing main body constituting the space of the water jacket is open to the turbine side, and therefore can be formed without using a core or a baseboard. Thereby, manufacture of a bearing housing becomes easy and the manufacturing cost can be reduced.

  Further, in the above bearing housing, the base body concave portion of the bearing main body portion which is a space constituting the water jacket is formed without using a core or a baseboard, so that the baseboard is removed from the molded bearing main body portion. There is no space (through-hole etc.) formed later. For this reason, for example, when a flange portion for supplying and discharging cooling water to be circulated in the water jacket is provided on the outer peripheral surface of the bearing main body portion, a degree of freedom is created at a position where the flange portion is provided. Thereby, the mounting property to the internal combustion engine of the supercharger containing a bearing housing can be improved.

  Further, for example, when the entire turbocharger is mainly supported by a part of the turbine housing that accommodates the turbine impeller, the entire turbocharger can be reduced in weight by reducing the weight of the bearing housing. The required strength of the turbine housing that supports the supercharger can be reduced. Thereby, weight reduction of a turbine housing can be achieved and the heat capacity of a turbine housing can be reduced in connection with it.

  As a result, when passing through the turbine housing, the amount of heat of the exhaust gas absorbed by the turbine housing can be reduced. Therefore, when an exhaust gas purifying catalyst is disposed on the downstream side of the turbine housing, higher temperature exhaust gas can be sent to the catalyst. And while being able to improve the warming-up property of a catalyst, exhaust gas purification performance can be improved.

  Thus, according to the present invention, it is possible to provide a bearing housing for a supercharger that achieves both weight reduction and heat resistance.

Explanatory drawing which shows the structure of the bearing housing in an Example. Explanatory drawing which shows the bearing housing of the state which supported the rotating shaft in an Example. Explanatory drawing which shows the bearing main-body part and cap part in an Example. Explanatory drawing which shows the water jacket in a bearing main-body part in an Example. Explanatory drawing which shows the water flange part of the bearing main-body part in an Example.

In the bearing housing, the bearing main body is made of aluminum. For example, AC2B-T6 (aluminum alloy), AC4C-T6 (aluminum alloy), or the like can be used as the material constituting the bearing body.
The cap portion is made of iron. For example, SS400 (general structural rolled steel), S45C (carbon steel), or the like can be used as a material constituting the cap portion.

Moreover, it is preferable that the cap portion is provided with a cap recess that opens toward one side in the axial direction and constitutes a part of the water jacket.
In this case, it is possible to increase the contact area between the cap portion that is disposed on the turbine side and that is particularly susceptible to the influence of the heat of the exhaust gas, and the cooling water flowing through the water jacket. Thereby, the cooling performance of a water jacket can be improved effectively and the heat resistance of a bearing housing can be ensured more fully.

Further, the cap portion is preferably provided with a cap convex portion that protrudes toward one side in the axial direction and is press-fitted into a part of the main body concave portion of the bearing main body portion. 3).
In this case, the bearing main body portion and the cap portion are formed by pressing the cap convex portion of the cap portion into the axial direction one side (hereinafter referred to as the compressor side as appropriate) from the opening of the main body concave portion of the bearing main body portion. The cooling water leakage path at the contact interface with the water jacket can be lengthened, and cooling water leakage from the water jacket can be prevented. Moreover, mixing of the lubricating oil supplied into the main body shaft hole of the bearing main body and the cooling water in the water jacket can also be prevented.

A bearing housing for a supercharger according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the bearing housing 1 of this example includes a compressor impeller 41 on one axial side (compressor side) X, and a rotation provided with a turbine impeller 42 on the other axial side (turbine side) Y. A water jacket 12 is formed on the outer periphery of the rotating shaft 4 while supporting the shaft 4.
The bearing housing 1 includes an aluminum bearing body 2 and an iron cap 3 that covers the other axial side (turbine side) Y of the bearing body 2.

The bearing body 2 has a body shaft hole 21 that penetrates in the axial direction and through which the rotary shaft 4 is inserted, and is formed on the outer periphery of the body shaft hole 21 and faces the other side (turbine side) Y in the axial direction. And a main body recess 22 having an opening 220 that is open.
The cap portion 3 is attached to the other axial side (turbine side) Y of the bearing body portion 2 so as to close the opening 220 of the body recess portion 22, and constitutes the water jacket 12 between the cap portion 3 and the body recess portion 22. ing.
This will be described in detail below.

As shown in FIG. 2, the supercharger 8 of this example is used for a turbocharger of an automobile. The turbocharger rotates the turbine impeller 42 using the energy of the exhaust gas, thereby rotating the compressor impeller 41 disposed on the rotary shaft 4 coaxial with the turbine impeller 42 to produce compressed air.
The bearing housing 1 is disposed between a compressor housing (not shown) that houses the compressor impeller 41 and a turbine housing (not shown) that houses the turbine impeller 42.

  As shown in FIGS. 1 and 2, the bearing housing 1 has an axial hole 11 through which the rotary shaft 4 is inserted while penetrating in the axial direction. The bearing housing 1 supports a rotating shaft 4 by arranging a cylindrical bearing member 111 and a plurality of bearings 112 in a shaft hole 11. The rotary shaft 4 has a compressor impeller 41 fixed to an end portion on the compressor side X, and a turbine impeller 42 fixed to an end portion on the turbine side Y.

  Further, a water jacket 12 formed on the outer periphery of the shaft hole 11 (rotating shaft 4) is provided inside the bearing housing 1. The water jacket 12 is formed on the outer periphery of the shaft hole 11 (rotating shaft 4) over substantially the entire circumference in the circumferential direction, and constitutes a passage through which the cooling water W (FIGS. 3 and 4) flows.

  The bearing housing 1 is configured by assembling an aluminum bearing body 2 and an iron cap 3 that covers the turbine side Y of the bearing body 2. In this example, the bearing body 2 is made of an aluminum alloy material (AC2B-T6, AC4C-T6, etc.). Moreover, the cap part 3 consists of iron-type materials (SS400, S45C etc.).

As shown in FIGS. 1 to 3, the bearing main body 2 has a main body shaft hole 21 through which the rotating shaft 4 is inserted while penetrating in the axial direction. The main body shaft hole 21 constitutes a part of the shaft hole 11 of the bearing housing 1.
The end surface 202 on the turbine side Y of the bearing main body 2 is provided with a main body recess 22 that is recessed toward the compressor side X and has an opening 220 that opens toward the turbine side Y. The main body recess 22 is formed over the entire circumference in the circumferential direction on the outer periphery of the main body shaft hole 21.

  The main body concave portion 22 of the bearing main body portion 2 includes a concave large-diameter portion 221 having an opening 220 and a concave small-diameter portion 222 formed on the compressor side X from the bottom surface of the large-diameter portion 221. In the large diameter portion 221, a cap convex portion 32 of the cap portion 3 described later is press-fitted. Moreover, the small diameter part 222 comprises a part of water jacket 12 with the cap recessed part 33 of the cap part 3 mentioned later.

As shown in FIGS. 3 to 5, the outer peripheral surface 203 of the bearing body 2 has a cooling water supply port 231 for supplying the cooling water W to the water jacket 12 and a cooling water discharge port 232 for discharging the cooling water W. A water flange portion 23 is provided.
The cooling water W is supplied from the cooling water supply port 231 of the water flange portion 23, passes through the water jacket 12, and is finally discharged from the cooling water discharge port 232 of the water flange portion 23.

As shown in FIG. 2, a lubricating oil passage 24 serving as a passage through which the lubricating oil O flows is formed in the bearing body 2. The lubricating oil passage 24 is provided with an oil jacket 241 for circulating the lubricating oil O and cooling the bearing housing 1.
As shown in FIG. 3, the outer peripheral surface 203 of the bearing body 2 is provided with an oil flange portion 25 having a lubricant discharge port 252 for discharging the lubricant O.
The lubricating oil O passes through the lubricating oil passage 24 in the bearing main body 2 and is supplied to the main body shaft hole 21 (shaft hole 11), the oil jacket 241 and the like through which the rotary shaft 4 is inserted, and finally. The oil is discharged from the lubricating oil outlet 252 of the oil flange portion 25.

As shown in FIGS. 1 to 3, the cap portion 3 has a disk shape, and has a cap shaft hole 31 through which the rotation shaft 4 is inserted while penetrating in the axial direction at the center portion thereof. The cap shaft hole 31 constitutes a part of the shaft hole 11 of the bearing housing 1.
Further, the cap portion 3 is attached to the turbine side Y of the bearing main body 2 so as to close the opening 220 of the main body concave portion 22 of the bearing main body 2.

  Specifically, a cap convex portion 32 that protrudes toward the compressor side X is provided on the end surface 301 on the compressor side X of the cap portion 3 over the entire circumference. A cap concave portion 33 that is recessed toward the turbine side Y and that opens toward the compressor side X is provided on the front end surface 321 of the cap convex portion 32 over the entire circumference in the circumferential direction. The cap recess 33 is provided so as to face the small diameter portion 222 of the body recess 22 of the bearing body 2.

  The cap portion 3 press-fits the cap convex portion 32 into the large-diameter portion 221 of the main body concave portion 22 of the bearing main body portion 2 so as to close the opening 220 of the main body concave portion 22, and at the turbine side of the bearing main body portion 2. Attached to Y. The water jacket 12 is configured by the small-diameter portion 222 of the main body concave portion 22 of the bearing main body portion 2 and the cap concave portion 33 of the cap portion 3 communicating with the small-diameter portion 222.

The effect in the bearing housing 1 of this example is demonstrated.
The bearing housing 1 of this example is composed of an aluminum bearing body 2 and an iron cap 3. That is, in the bearing housing 1, the bearing body 2, which is a portion that mainly supports the rotating shaft 4, is made of aluminum. Therefore, the mass can be reduced as compared with the case where the entire bearing housing 1 is made of iron. Thereby, weight reduction of the bearing housing 1 is realizable.

Further, since the bearing housing 1 is made of aluminum for the bearing body 2, processing such as cutting on the bearing body 2 is facilitated. As a result, the bearing housing 1 can be easily manufactured and its manufacturing cost can be reduced.
Moreover, the bearing housing 1 has covered the turbine side Y of the bearing main-body part 2 made from aluminum with the cap part 3 made from iron. Here, the turbine side Y of the bearing housing 1 is particularly easily affected by the heat of the exhaust gas. Therefore, the turbine portion Y of the bearing housing 1 is provided with the cap portion 3 mainly composed of iron that is more heat-resistant than aluminum, so that the cooling effect by the cooling water W circulated in the water jacket 12 is combined with the turbine. Sufficient heat resistance can be secured against heat from the side Y.

  Further, the bearing housing 1 constitutes the water jacket 12 by closing the opening 220 of the main body concave portion 22 of the bearing main body portion 2 with the cap portion 3. For example, when the space constituting the water jacket is formed by casting or the like inside a single-piece bearing housing, a core and a baseboard are required at the time of molding. However, in the above structure, the main body concave portion 22 of the bearing main body portion 2 constituting the space of the water jacket 12 is open to the turbine side Y, and therefore can be molded without using a core or a baseboard. . Thereby, manufacture of the bearing housing 1 becomes easy and the manufacturing cost can be reduced.

  Further, in the bearing housing 1, by forming the main body concave portion 22 of the bearing main body portion 2, which is a space constituting the water jacket 12, without using a core or a baseboard, There are no spaces (such as through-holes) formed after removing the wood. Therefore, when the water flange portion 23 for supplying and discharging the cooling water W to be circulated in the water jacket 12 is provided on the outer peripheral surface 203 of the bearing body portion 2 as in this example, the water flange portion 23 is provided. A degree of freedom is born in the position. Thereby, the mounting property to the internal combustion engine of the supercharger 8 including the bearing housing 1 can be improved.

  Further, for example, when the entire turbocharger 8 is mainly supported by a part of a turbine housing (not shown) that accommodates the turbine impeller 42, the entire turbocharger 8 is reduced by reducing the weight of the bearing housing 1. The weight can be reduced, and the required strength of the turbine housing that supports the supercharger 8 can be reduced. Thereby, weight reduction of a turbine housing can be achieved and the heat capacity of a turbine housing can be reduced in connection with it.

  As a result, when passing through the turbine housing, the amount of heat of the exhaust gas absorbed by the turbine housing can be reduced. Therefore, when an exhaust gas purifying catalyst is disposed on the downstream side of the turbine housing, higher temperature exhaust gas can be sent to the catalyst. And while being able to improve the warming-up property of a catalyst, exhaust gas purification performance can be improved.

  Further, in this example, the cap portion 3 is provided with a cap recess 33 that opens toward one axial side (compressor side) X and constitutes a part of the water jacket 12. Therefore, it is possible to increase the contact area between the cap portion 3 that is arranged on the turbine side Y and is particularly susceptible to the influence of the heat of exhaust gas and the cooling water W that circulates in the water jacket 12. Thereby, the cooling performance of the water jacket 12 can be improved effectively, and the heat resistance of the bearing housing 1 can be more sufficiently ensured.

  Further, the cap portion 3 is provided with a cap convex portion 32 that protrudes toward one axial side (compressor side) X and is press-fitted into a part of the main body concave portion 22 of the bearing main body portion 2. That is, the cap convex portion 32 of the cap portion 3 is pressed into the compressor side X from the opening 220 of the main body concave portion 22 of the bearing main body portion 2 to cool the contact interface between the bearing main body portion 2 and the cap portion 3. The leakage path of the water W can be lengthened and the leakage of the cooling water W from the water jacket 12 can be prevented. In addition, mixing of the lubricating oil O supplied into the main body shaft hole 21 of the bearing main body 2 and the cooling water W in the water jacket 12 can be prevented.

  Thus, according to this example, it is possible to provide a bearing housing 1 for a supercharger that achieves both realization of weight reduction and ensuring of heat resistance.

DESCRIPTION OF SYMBOLS 1 Bearing housing 12 Water jacket 2 Bearing main-body part 21 Main-body shaft hole 22 Main-body recessed part 220 Opening part 3 Cap part 4 Rotating shaft 41 Compressor impeller 42 Turbine impeller X Compressor side (one axial direction side)
Y Turbine side (the other side in the axial direction)

Claims (3)

In a bearing housing for a supercharger having a compressor impeller on one side in the axial direction and a rotary shaft having a turbine impeller on the other side in the axial direction and having a water jacket formed on the outer periphery of the rotary shaft,
The bearing housing includes an aluminum bearing main body and an iron cap that covers the other axial side of the bearing main body.
The bearing main body portion has a main body shaft hole that penetrates in the axial direction and through which the rotating shaft is inserted, and is formed on the outer periphery of the main body shaft hole and opens toward the other side in the axial direction. A body recess having an opening is provided,
The cap portion is attached to the other axial side of the bearing body portion so as to close the opening of the body recess portion, and constitutes the water jacket between the body recess portion. A bearing housing for a turbocharger.   2. The bearing housing according to claim 1, wherein the cap portion is provided with a cap recess that opens toward the one side in the axial direction and constitutes a part of the water jacket. Bearing housing for machine.   3. The bearing housing according to claim 1, wherein the cap portion has a cap convex portion that protrudes toward one side in the axial direction and is press-fitted into a part of the main body concave portion of the bearing main body portion. A bearing housing for a supercharger, characterized in that it is provided.

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