JPWO2020144741A1 - Compressor insert assembly, compressor and compressor assembly method - Google Patents

Abstract

The insert assembly of the compressor according to at least one embodiment of the present invention restricts the insert member inserted inside the bearing housing of the compressor and the insert member from moving toward the compressor impeller side with respect to the bearing housing. An insert assembly of a compressor comprising a restricting member for the purpose of the bearing housing, wherein the bearing housing has a bearing housing side recess formed on an inner peripheral surface of the bearing housing into which a part of the restricting member is inserted. Including, the insert assembly is a region where an outer radial region in an internal space defined by the inner peripheral surface of the bearing housing and an axial region on the compressor impeller side of the bearing housing side recess overlap. It has a facing surface facing the back surface of the compressor impeller, which is formed in the outer peripheral region near a certain impeller.

Description

The present disclosure relates to an insert assembly of a compressor, a compressor and a method of assembling the compressor.

Conventionally, as a technique for improving the output of an engine, a method (supercharging) of compressing intake air by a turbocharger and supplying the compressed intake air to the engine has been known and is widely used in automobile engines and the like. Usually, the turbocharger includes a rotating shaft, a turbine wheel provided on one end side of the rotating shaft, and a compressor wheel provided on the other end side of the rotating shaft. Then, the exhaust energy of the exhaust gas acts on the turbine wheel to rotate the rotating shaft at high speed, so that the compressor wheel provided on the other end side of the rotating shaft compresses the intake air.

A force (thrust force) that moves the rotating shaft in the axial direction acts on the rotating shaft of the turbocharger. Therefore, the turbocharger is provided with a thrust bearing device for supporting the rotating shaft in the axial direction. As an example of such a thrust bearing device, for example, the thrust bearing device shown in Patent Document 1 can be mentioned (see Patent Document 1).

International Publication No. 2016/098230

In the thrust bearing device described in Patent Document 1, the thrust bearing is sandwiched between the inner peripheral convex portion of the bearing housing and an annular insert member (retainer), and the thrust bearing is fixed so as not to move in the extending direction of the rotating shaft. ..
In the thrust bearing device described in Patent Document 1, the retainer is inserted into the bearing housing from the compressor impeller side and is moved toward the compressor impeller side by an annular movement restricting member fitted in the inner peripheral groove of the bearing housing. Is regulated.

In the thrust bearing device described in Patent Document 1, there is a space between the retainer and the back surface of the compressor impeller for fitting the movement restricting member into the inner peripheral groove of the bearing housing. Therefore, the rotation of the compressor impeller agitates the air in the space to generate convection, and when the air in the space is heated, the compressor impeller is heated, the intake air temperature rises, and the compression efficiency decreases. Resulting in.

In view of the above circumstances, at least one embodiment of the present invention aims to suppress a decrease in compression efficiency in a compressor.

(1) The insert assembly of the compressor according to at least one embodiment of the present invention is
The insert member inserted inside the bearing housing of the compressor,
An insert assembly of a compressor comprising a restricting member for restricting the insert member from moving toward the compressor impeller side with respect to the bearing housing.
The bearing housing includes a bearing housing side recess formed on the inner peripheral surface of the bearing housing into which a portion of the regulatory member is inserted.
The insert assembly is an impeller that is a region where an outer radial region in an internal space defined by the inner peripheral surface of the bearing housing and an axial region on the compressor impeller side of the bearing housing side recess overlap. It has a facing surface facing the back surface of the compressor impeller, which is formed in the vicinity outer peripheral region.

According to the configuration of (1) above, since the facing surface is formed in the outer peripheral region near the impeller, the space between the back surface of the compressor impeller and the insert assembly can be reduced. Thereby, the air in the space is agitated by the rotation of the compressor impeller, so that the air in the space is heated and the compressor impeller can be suppressed from being heated, and the decrease in the compression efficiency in the compressor can be suppressed. ..

(2) In some embodiments, in the configuration of (1) above, the facing surface is a region of the radial region that is radially outer of the position of the radially inner end of the regulatory member. Including the outer peripheral side facing portion facing the back surface of the compressor impeller.

As described above, in the conventional compressor, there is a space for fitting the annular movement restricting member into the inner peripheral groove of the bearing housing. In order to fit this movement restricting member into the inner peripheral groove of the bearing housing, the outer diameter is reduced so that the outer diameter of the annular movement restricting member is smaller than the inner diameter of the inner peripheral surface of the bearing housing. The movement restricting member is inserted into the bearing housing from the compressor impeller side. Therefore, in the bearing housing, if the annular range from the inner peripheral surface of the bearing housing to the inner peripheral surface of the movement restricting member in a state where the outer diameter is reduced as described above is not at least a space, the movement restricting member is used. Cannot be fitted into the inner groove of the bearing housing. Therefore, in the conventional compressor, the range from the inner peripheral surface of the bearing housing to the inner peripheral surface of the movement restricting member in the state where the outer diameter is reduced as described above is at least an annular space.

On the other hand, in the configuration of (2) above, the facing surface facing the back surface of the compressor impeller, which is formed in the outer peripheral region near the impeller, is the position of the radial inner end portion of the restricting member in the radial region. Includes an outer peripheral facing portion facing the back surface of the compressor impeller in a region outward in the radial direction. Therefore, the space can be made smaller than that of a conventional compressor. As a result, it is possible to suppress a decrease in compression efficiency in the compressor.

(3) In some embodiments, in the configuration of (1) or (2) above, the facing surface is formed on the insert member.

According to the configuration (3) above, since the facing surface is formed on the insert member, it is not necessary to provide another member for forming the facing surface, and it is possible to suppress the complicated configuration of the compressor.

(4) In some embodiments, in the configuration of (2) or (3) above,
The insert member is
The insert-side recess formed on the outer peripheral surface of the insert member,
Includes a radial region outside the bottom surface of the insert-side recess and an outer peripheral portion near the impeller formed in a region where the axial region on the compressor impeller side of the insert-side recess overlaps.
At least a part of the facing surface is formed on the outer peripheral portion in the vicinity of the impeller.

According to the configuration of (4) above, at least a part of the facing surface is formed in the region which is radially outside the bottom surface of the insert-side recess and which is closer to the compressor impeller than the insert-side recess. As a result, the space can be made smaller than that of a conventional compressor. As a result, it is possible to suppress a decrease in compression efficiency in the compressor.

(5) In some embodiments, in the configuration of (4) above,
The insert member is
Includes an inner peripheral portion formed in a radial region inside the bottom surface of the insert-side recess.
The end face on the compressor impeller side of the inner peripheral portion is formed flush with the end face on the compressor impeller side of the outer peripheral portion in the vicinity of the impeller.

According to the configuration of (5) above, the end face on the compressor impeller side of the inner peripheral portion is formed flush with the end face on the compressor impeller side of the outer peripheral portion in the vicinity of the impeller, so that the space is larger than that of the conventional compressor. It can be made smaller. As a result, it is possible to further suppress a decrease in compression efficiency in the compressor.

(6) In some embodiments, in the configuration of (4) or (5) above,
The bearing housing side recess is formed over the entire circumference of the inner peripheral surface of the bearing housing.
The insert-side recess is formed over the entire circumference of the outer peripheral surface of the insert member.
The regulating member includes a ring-shaped member extending in the circumferential direction with respect to the center line of the regulating member.
The ring-shaped member has an outer peripheral portion inserted into the bearing housing side recess and an inner peripheral portion inserted into the insert side recess.

According to the configuration of (6) above, since the regulating member includes the ring-shaped member, the configuration of the regulating member can be simplified.

(7) In some embodiments, in the configuration of (6) above, the outer diameter of the ring-shaped member in the state of being inserted into the bearing housing side recess is equal to or less than the outer diameter in the natural state.

According to the configuration of (7) above, since the outer diameter of the ring-shaped member in the state of being inserted into the recess on the bearing housing side is equal to or less than the outer diameter in the natural state, the ring-shaped member is locked in the recess on the bearing housing side. Therefore, it does not come off from the recess on the bearing housing side. Therefore, it is possible to regulate the movement of the insert member toward the compressor impeller side with respect to the bearing housing. This makes it possible to regulate the movement of the insert member toward the compressor impeller side with respect to the bearing housing with a simple configuration.

(8) In some embodiments, in the configuration of (7) above, the bearing housing is formed with a bearing housing side axial space communicating from the back surface side of the compressor impeller to the bearing housing side recess. ..

According to the configuration (8) above, the ring-shaped member inserted into the bearing housing side recess can be accessed from the bearing housing side axial space. Therefore, for example, by inserting a jig or the like into the bearing housing side axial space. The ring-shaped member can be made to have a smaller diameter than the natural state. As a result, the restriction by the ring-shaped member can be released and the insert member can be moved to the compressor impeller side, so that the insert member can be removed from the bearing housing.

(9) In some embodiments, in the configuration of (6) above, the inner diameter of the ring-shaped member in the state of being inserted into the insert-side recess is equal to or larger than the inner diameter in the natural state.

According to the configuration of (9) above, since the inner diameter of the ring-shaped member in the state of being inserted into the insert-side recess is equal to or larger than the inner diameter in the natural state, the ring-shaped member is locked to the insert-side recess and the insert side. It will not come off from the recess. Therefore, it is possible to regulate the movement of the insert member toward the compressor impeller side with respect to the bearing housing. This makes it possible to regulate the movement of the insert member toward the compressor impeller side with respect to the bearing housing with a simple configuration.

(10) In some embodiments, in the configuration of (9) above,
The insert member is
Of the axial ends of the insert member, one side end facing the back surface of the compressor impeller,
With the other end portion on the opposite side of the one side end portion along the axial direction of the insert member, the outer diameter thereof being smaller than the inner diameter of the ring-shaped member in a natural state. ,
A tapered portion whose outer diameter increases from the other end to the compressor impeller side,
Have.

According to the configuration of (10) above, by inserting the insert member into the bearing housing in which the ring-shaped member is previously inserted into the recess on the bearing housing side, the tapered portion is inserted into the inner circumference of the ring-shaped member. The insert member can be inserted inside the bearing housing while expanding the diameter of the ring-shaped member at the tapered portion.

(11) In some embodiments, in the configuration of (9) or (10), the insert member is formed with an insert-side axial space communicating from the back surface side of the compressor impeller to the insert-side recess. ing.

According to the configuration of (11) above, the ring-shaped member inserted into the insert-side recess can be accessed from the insert-side axial space. Therefore, for example, the ring-shaped member can be accessed by inserting a jig or the like into the insert-side axial space. Can be made to have a larger diameter than the natural state. As a result, the restriction by the ring-shaped member can be released and the insert member can be moved to the compressor impeller side, so that the insert member can be removed from the bearing housing.

(12) In some embodiments, in any of the configurations (6) to (11) above,
The ring-shaped member is
A first tapered surface formed on one of the two end faces separated along the center line, which faces the back surface of the compressor impeller, and is said to be radially outward with respect to the center line. A first tapered surface formed so that the dimensions of the ring-shaped member become smaller in the direction along the center line.
Or,
A second tapered surface formed on the other end face of the two end faces, which is different from the one end face, and the ring in the direction along the center line as it goes inward in the radial direction with respect to the center line. It has one of the second tapered surfaces formed so that the size of the shaped member becomes smaller.

According to the configuration of the above (12), the ring-shaped member presses the mating member on the first tapered surface or the second tapered surface by the force that the ring-shaped member tries to reduce or expand the diameter, so that the ring is formed. The reaction force acting on the shaped member can urge the insert member toward the side opposite to the compressor impeller.

(13) In some embodiments, in any of the configurations (6) to (11) above, the ring-shaped member has a wave shape that meanders on one side and the other side along the center line. It is a mold ring-shaped member.

According to the configuration (13), the insert member can be urged toward the side opposite to the compressor impeller by utilizing the elastic force in the direction along the center line of the corrugated ring. That is, the wall surface of the concave portion on the bearing housing side, which is in contact with the corrugated ring from the direction along the center line, and the wall surface of the concave portion on the insert side opposite to the compressor impeller are formed on the corrugated ring. By urging the insert members so as to be separated from each other by the elastic force, the insert member can be urged toward the side opposite to the compressor impeller.

(14) In some embodiments, in the configuration of (4) above,
The regulatory member is
A claw member configured so that the outer diameter side is inserted into the bearing housing side recess and the inner diameter side is inserted into the insert side recess.
Includes an urging member that urges the claw member radially inward or radially outward in the regulatory member.

For example, when the above-mentioned ring-shaped member is used, the bearing housing side recess is formed over substantially the entire circumference of the inner peripheral surface of the bearing housing, and the insert side recess is formed over substantially the entire circumference of the outer peripheral surface of the insert member. There is a need to.
In that respect, according to the configuration of (14) above, the size of the bearing housing side recess and the insert side recess may be any size as long as the claw member can be inserted. Therefore, the size of the bearing housing side recess and the insert side recess in the circumferential direction can be suppressed. As a result, it is possible to suppress a decrease in the strength of the bearing housing and the insert member.

(15) In some embodiments, in the configuration of (1) or (2) above, the facing surface is formed on the regulating member.

According to the configuration of (15) above, since the facing surface is formed on the regulating member, it is not necessary to provide another member for forming the facing surface, and it is possible to suppress the complicated configuration of the compressor.

(16) In some embodiments, in the configuration of (15) above,
The regulatory member is
A ring-shaped member whose at least a part is inserted into the bearing housing side recess,
An annular plate portion facing the back surface of the compressor impeller and
A connecting portion for connecting the ring-shaped member and the annular plate portion is included.
At least a part of the facing surface is formed on the annular plate portion.

According to the configuration of (16) above, the space between the back surface of the compressor impeller and the insert assembly can be reduced by the regulating member having a relatively simple shape.

(17) The compressor according to at least one embodiment of the present invention is
With the compressor impeller,
With the bearing housing
With the insert assembly having any of the above configurations (1) to (16),
To prepare for.

According to the configuration of (17) above, since the insert assembly according to the configuration of (1) is included, it is possible to suppress the compressor impeller from being heated, and it is possible to suppress a decrease in compression efficiency in the compressor.

(18) The method for assembling the compressor according to at least one embodiment of the present invention is as follows.
The insert member inserted inside the bearing housing of the compressor,
A method for assembling a compressor in which an insert assembly of a compressor including a restricting member for restricting the movement of the insert member to the compressor impeller side with respect to the bearing housing is attached to the bearing housing.
The bearing housing includes a bearing housing side recess formed over the entire circumference of the inner peripheral surface of the bearing housing into which a portion of the regulatory member is inserted.
The insert member includes an insert-side recess formed over the entire circumference of the outer peripheral surface of the insert member.
The regulating member includes a ring-shaped member extending in the circumferential direction with respect to the center line of the regulating member.
A step in which the inner peripheral side reduces the diameter of the ring-shaped member inserted into the insert side recess from the natural state, and
A step of inserting the insert member into the bearing housing with the ring-shaped member reduced in diameter from the natural state, and a step of inserting the insert member into the bearing housing.
A step of inserting the outer peripheral side of the ring-shaped member into the recess on the bearing housing side,
To prepare for.

According to the method (18) above, the insert member is inserted into the bearing housing in a state where the diameter of the ring-shaped member is reduced from the natural state, and then the outer peripheral side of the ring-shaped member is placed in the bearing housing side recess. By inserting the bearing housing, it is possible to restrict the insert member from moving toward the compressor impeller side. This makes it possible to simplify the method of assembling the compressor.

(19) The method for assembling the compressor according to at least one embodiment of the present invention is as follows.
The insert member inserted inside the bearing housing of the compressor,
A method for assembling a compressor in which an insert assembly of a compressor including a restricting member for restricting the movement of the insert member to the compressor impeller side with respect to the bearing housing is attached to the bearing housing.
The bearing housing includes a bearing housing side recess formed over the entire circumference of the inner peripheral surface of the bearing housing into which a portion of the regulatory member is inserted.
The insert member includes an insert-side recess formed over the entire circumference of the outer peripheral surface of the insert member.
The regulating member includes a ring-shaped member extending in the circumferential direction with respect to the center line of the regulating member.
A step in which the outer peripheral side expands the diameter of the ring-shaped member inserted into the bearing housing side recess from the natural state, and
A step of inserting the insert member into the bearing housing in a state where the ring-shaped member has a larger diameter than the natural state.
A step of inserting the inner peripheral side of the ring-shaped member into the insert-side recess,
To prepare for.

According to the method (19) above, the insert member is inserted into the bearing housing in a state where the diameter of the ring-shaped member is larger than that in the natural state, and then the inner peripheral side of the ring-shaped member is placed in the insert-side recess. By inserting the insert member, it is possible to restrict the movement of the insert member toward the compressor impeller side with respect to the bearing housing. This makes it possible to simplify the method of assembling the compressor.

According to at least one embodiment of the present invention, it is possible to suppress a decrease in compression efficiency in a compressor.

It is sectional drawing which showed the cross section along the axial direction of the rotation axis in the turbocharger which concerns on one Embodiment of this invention. FIG. 1 is an enlarged view of the vicinity of part a in FIG. 1 and is a cross-sectional view showing an insert assembly according to an embodiment of the present invention. It is a schematic perspective view of the regulation member used in the insert assembly which concerns on one Embodiment shown in FIG. It is a figure for demonstrating the assembling procedure of the insert assembly which concerns on one Embodiment shown in FIG. 2, and is the figure which shows the state before inserting the insert assembly into a bearing housing. It is a figure for demonstrating the assembling procedure of the insert assembly which concerns on one Embodiment shown in FIG. 2, and is the figure which shows the state after inserting the insert assembly into a bearing housing. It is a figure corresponding to the enlarged view near the part a in FIG. 1, and is the cross-sectional view which showed the insert assembly which concerns on other embodiment of this invention. It is a schematic perspective view of the regulation member used in the insert assembly which concerns on the other embodiment shown in FIG. It is a figure for demonstrating the assembling procedure of the insert assembly which concerns on one Embodiment shown in 6, and is the figure which shows the state before inserting the insert assembly into a bearing housing. It is a figure for demonstrating the assembling procedure of the insert assembly which concerns on other embodiment shown in FIG. 6, and is the figure which shows the state after inserting the insert assembly into a bearing housing. It is a figure corresponding to the enlarged view near the part a in FIG. 1, and is the cross-sectional view which showed the insert assembly which concerns on still another Embodiment of this invention. It is a figure for demonstrating the assembling procedure of the insert assembly which concerns on other embodiment shown in FIG. 10, and is the figure which shows the state before inserting the insert assembly into a bearing housing. It is a figure for demonstrating the assembling procedure of the insert assembly which concerns on other embodiment shown in FIG. 10, and is the figure which shows the state in the process of inserting the insert assembly into a bearing housing. It is a figure for demonstrating the assembling procedure of the insert assembly which concerns on other embodiment shown in FIG. 10, and is the figure which shows the state after inserting the insert assembly into a bearing housing. It is a figure corresponding to the enlarged view near the part a in FIG. 1, and is the cross-sectional view which showed the insert assembly which concerns on still another Embodiment of this invention. It is a figure corresponding to the enlarged view near the part a in FIG. 1, and is the cross-sectional view which showed the insert assembly which concerns on still another Embodiment of this invention. It is a figure corresponding to the enlarged view near the part a in FIG. 1, and is the cross-sectional view which showed the insert assembly which concerns on still another Embodiment of this invention. It is an example of a view of the bearing housing and the insert member according to the embodiment shown in FIGS. 2 and 6 as viewed from the compressor impeller side. 2 is another example of the view of the bearing housing and the insert member according to the embodiment shown in FIGS. 2 and 6 as viewed from the compressor impeller side. 10 is an example of a view of the bearing housing and the insert member according to the embodiment shown in FIGS. 10 and 14 as viewed from the compressor impeller side. 10 is another example of the view of the bearing housing and the insert member according to the embodiment shown in FIGS. 10 and 14 as viewed from the compressor impeller side. It is sectional drawing which showed the cross section of the conventional turbocharger along the axis direction of the rotation axis. 2 is a flowchart showing a procedure of an assembling method of a compressor according to an embodiment shown in FIGS. 2 and 6. 10 is a flowchart showing a procedure of an assembling method of a compressor according to an embodiment shown in FIGS. 10 and 14.

Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the present invention to this, but are merely explanatory examples. No.
For example, expressions that represent relative or absolute arrangements such as "in one direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric" or "coaxial" are exact. Not only does it represent such an arrangement, but it also represents a tolerance or a state of relative displacement at an angle or distance to the extent that the same function can be obtained.
For example, expressions such as "same", "equal", and "homogeneous" that indicate that things are in the same state not only represent exactly the same state, but also have tolerances or differences to the extent that the same function can be obtained. It shall also represent the existing state.
For example, the expression representing a shape such as a quadrangular shape or a cylindrical shape not only represents a shape such as a quadrangular shape or a cylindrical shape in a geometrically strict sense, but also an uneven portion or a chamfer within the range where the same effect can be obtained. It shall also represent the shape including the part and the like.
On the other hand, the expressions "equipped", "equipped", "equipped", "included", or "have" one component are not exclusive expressions excluding the existence of other components.

FIG. 1 is a cross-sectional view showing a cross section of the turbocharger according to the embodiment of the present invention along the axial direction of the rotation axis.
The turbocharger according to the embodiment of the present invention is not particularly limited, but is, for example, a turbocharger mounted on an automobile engine or the like.
As shown in FIG. 1, the turbocharger 100 of the present embodiment has a turbine housing 102 for accommodating a turbine impeller 103 provided on one end side of the rotary shaft 2 and a compressor impeller provided on the other end side of the rotary shaft 2. It comprises three housings: a compressor housing 104 accommodating 105, a radial bearing 110 rotatably supporting the rotating shaft 2, and a bearing housing 106 accommodating a thrust bearing 4 supporting the thrust force of the rotating shaft 2.

A spiral turbine scroll flow path 113 is formed on the outer peripheral portion of the turbine housing 102. A turbine impeller 103 is arranged at the center of the turbine scroll flow path 113. The turbine impeller 103 is composed of a truncated cone-shaped turbine hub 103a in which the head of a cone is cut off in a plane parallel to the bottom surface, and a plurality of turbine blades 103b provided so as to project radially from the peripheral surface of the turbine hub 103a. Become. The turbine hub 103a of the turbine impeller 103 is joined to one end of the rotating shaft 2 by welding, for example. Then, the exhaust gas that flows through the turbine scroll flow path 113 and acts on the turbine impeller 103 is discharged to the outside of the turbine housing 102 from the exhaust gas outlet 111 that opens in the axial direction of the rotating shaft 2.

A spiral compressor scroll flow path 117 is formed on the outer peripheral portion of the compressor housing 104. A compressor impeller 105 is arranged at the center of the compressor scroll flow path 117. The compressor impeller 105 is composed of a truncated cone-shaped compressor hub 105a in which the head of a cone is cut off in a plane parallel to the bottom surface, and a plurality of compressor blades 105b provided so as to project radially from the peripheral surface of the compressor hub 105a. Become. A fitting hole (not shown) into which the other end side of the rotating shaft 2 is fitted is formed in the central portion of the compressor hub 105a of the compressor impeller 105. The compressor impeller 105 is fixed to the other end of the rotary shaft 2 by tightening the nut 116 from the tip of the compressor hub 105a after the one end side of the rotary shaft 2 is fitted into the fitting hole. Then, the intake gas that flows through the intake inlet 115 that opens in the axial direction of the rotating shaft 2 and is compressed by the compressor impeller 105 flows through the compressor scroll flow path 117 and is supplied to an engine (not shown).

The bearing housing 106 is arranged between the turbine housing 102 and the compressor housing 104, one end of which is connected to the turbine housing 102 and the other end of which is connected to the compressor housing 104. An internal space is formed inside the bearing housing 106 so that the rotating shaft 2 can be inserted in the axial direction, and the radial bearing 110 and the thrust bearing 4 described above are housed in this internal space. Further, an inlet oil passage 112 for supplying lubricating oil to the above-mentioned radial bearing 110 and the thrust bearing 4 is formed in the upper part of the bearing housing 106. The lubricating oil introduced into the bearing housing 106 from the inlet oil passage 112 lubricates the radial bearing 110 and the thrust bearing 4, and then from the outlet oil passage 114 formed in the lower part of the bearing housing 106 to the bearing housing 106. It is discharged to the outside.

The compressor 10 according to some embodiments includes a compressor impeller 105, a bearing housing 106, and an insert assembly 1 described later.

FIG. 2 is an enlarged view of the vicinity of part a in FIG. 1, and is a cross-sectional view showing an insert assembly according to an embodiment of the present invention. FIG. 3 is a schematic perspective view of a regulatory member used in the insert assembly according to the embodiment shown in FIG. FIG. 4 is a diagram for explaining an assembly procedure of the insert assembly according to the embodiment shown in FIG. 2, and is a diagram showing a state before the insert assembly is inserted into the bearing housing. FIG. 5 is a diagram for explaining an assembly procedure of the insert assembly according to the embodiment shown in FIG. 2, and is a diagram showing a state after the insert assembly is inserted into the bearing housing.

FIG. 6 is a view corresponding to an enlarged view in the vicinity of part a in FIG. 1, and is a cross-sectional view showing an insert assembly according to another embodiment of the present invention. FIG. 7 is a schematic perspective view of the regulatory member used in the insert assembly according to the other embodiment shown in FIG. FIG. 8 is a diagram for explaining an assembly procedure of the insert assembly according to the embodiment shown in FIG. 6, and is a diagram showing a state before the insert assembly is inserted into the bearing housing. FIG. 9 is a diagram for explaining an assembly procedure of the insert assembly according to another embodiment shown in FIG. 6, and is a diagram showing a state after the insert assembly is inserted into the bearing housing.

FIG. 10 is a view corresponding to an enlarged view in the vicinity of part a in FIG. 1, and is a cross-sectional view showing an insert assembly according to still another embodiment of the present invention. FIG. 11 is a diagram for explaining an assembly procedure of the insert assembly according to another embodiment shown in FIG. 10, and is a diagram showing a state before the insert assembly is inserted into the bearing housing. FIG. 12 is a diagram for explaining an assembly procedure of the insert assembly according to another embodiment shown in FIG. 10, and is a diagram showing a state in which the insert assembly is being inserted into the bearing housing. FIG. 13 is a diagram for explaining an assembly procedure of the insert assembly according to another embodiment shown in FIG. 10, and is a diagram showing a state after the insert assembly is inserted into the bearing housing.

FIG. 14 is a view corresponding to an enlarged view in the vicinity of part a in FIG. 1, and is a cross-sectional view showing an insert assembly according to still another embodiment of the present invention. FIG. 15 is a view corresponding to an enlarged view in the vicinity of part a in FIG. 1, and is a cross-sectional view showing an insert assembly according to still another embodiment of the present invention. FIG. 16 is a view corresponding to an enlarged view in the vicinity of part a in FIG. 1, and is a cross-sectional view showing an insert assembly according to still another embodiment of the present invention.

In some embodiments, the rotary shaft 2 is fitted with two thrust collars, a first thrust collar 3A and a second thrust collar 3B located closer to the turbine wheel than the first thrust collar 3A. The thrust bearing 4 is mounted on the outer peripheral side of the second thrust collar 3B. Further, the oil deflector 5 is mounted on the outer peripheral side of the first thrust collar 3A. Further, on the compressor side of the oil deflector 5, an insert member 7 configured to hold the oil deflector 5 and the thrust bearing 4 between the step portion formed on the inner peripheral wall surface of the bearing housing 106 is provided. It is mounted on the outer peripheral side of the 1 thrust collar 3A. As will be described in detail later, in some embodiments, the insert member 7 is compressed by a regulatory member 8 that is partially inserted into the bearing housing side recess 107 formed in the inner peripheral wall surface of the bearing housing 106. Movement to the impeller side is restricted. The details of the regulating member 8 will be described later.

FIG. 21 is a cross-sectional view showing a cross section of a conventional turbocharger along the axial direction of its rotation axis. In the conventional turbocharger 100M, a groove 106m is formed on the inner peripheral wall surface of the bearing housing 106, and the snap ring 8m fitted in the groove 106m moves the insert member (retainer) 7M to the compressor impeller side. Is regulated.
When assembling the conventional turbocharger 100M, the retainer 7M is inserted into the bearing housing 106 from the compressor impeller side toward the turbine impeller side, and then the snap ring 8m is mounted in the groove 106m. Therefore, between the retainer 7M and the back surface 105c of the compressor impeller 105, in order to allow the snap ring 8m to pass along the extending direction of the rotating shaft 2 in the region on the compressor impeller side of the groove 106m, the rotating shaft 2 It was necessary to secure a space 118 that had an annular shape when viewed along the extending direction of the.
Therefore, when the air in the space 118 is agitated by the rotation of the compressor impeller 105 to generate convection and the air in the space 118 is heated, the compressor impeller 105 is heated, the intake air temperature rises, and the compression efficiency is increased. Will drop.

Therefore, in the compressor 10 according to at least one embodiment of the present invention, the insert assembly 1 is configured so that the space 118 is as small as possible. Hereinafter, the insert assembly 1 according to some embodiments will be described in detail.

The insert assembly 1 according to at least one embodiment of the present invention is an insert member inserted inside the bearing housing 106 of the compressor 10, as shown in FIGS. 2, 4 to 6, and 8 to 16. 7 and a regulating member 8 for restricting the movement of the insert member 7 to the compressor impeller side with respect to the bearing housing 106 are provided.
The bearing housing 106 includes a bearing housing side recess 107 formed on the inner peripheral surface of the bearing housing 106 into which a part of the regulating member 8 is inserted.
The insert assembly 1 has a facing surface 71 facing the back surface 105c of the compressor impeller 105, which is formed in the outer peripheral region 93 near the impeller. The outer peripheral region 93 near the impeller is the outer radial region 91 (FIGS. 2, FIG. 4, FIG. 11) in the internal space 121 (see FIGS. 4, 8 and 11) defined by the inner peripheral surface 106b of the bearing housing 106. 6, FIG. 10, see FIGS. 14 to 16) and the axial region 92 on the compressor impeller side of the bearing housing side recess 107 (see FIGS. 2, 10, 10, 14 to 16) overlap. It is an area.

Here, the outer radial region 91 in the internal space 121 may be, for example, a region of two-thirds or more of the diameter Di of the inner peripheral surface 106b of the bearing housing 106 as shown in FIG. For example, a region of less than one-third of the diameter Di of the inner peripheral surface 106b of the bearing housing 106 may be the inner radial region 97 in the internal space 121. For example, a region of one-third or more and less than two-thirds of the diameter Di of the inner peripheral surface 106b of the bearing housing 106 may be an intermediate radial region 98 in the internal space 121.

Further, as shown in FIGS. 2, 10, 14, and 15 to 16, the radial region 91 is 80% or more (≧ 0.8 D) of the diameter D of the outer peripheral surface 73 of the insert member 7. It may be the area of. In this case, the insert assembly 1 has a radial region 91 of 80% or more (≧ 0.8 D) of the diameter D of the outer peripheral surface 73 of the insert member 7, and an axial region 92 on the compressor impeller side of the bearing housing side recess 107. It has a facing surface 71 facing the back surface 105c of the compressor impeller 105, which is formed in the outer peripheral region 93 near the impeller, which is a region where the above overlaps.

As shown in FIGS. 2, 6, 10, 14 to 16, in some embodiments, the surface of the bearing housing 106 on the compressor impeller side is located in a region having a diameter larger than the diameter D of the outer peripheral surface 73. 106a faces the back surface 105c of the compressor impeller 105.
It should be noted that the diameter D of the outer peripheral surface 73 of the insert member 7 referred to here is, in other words, the outer peripheral surface 73 formed so as to fit with the inner peripheral surface 106b of the bearing housing 106 with a gap of about a fitting tolerance. The diameter.
In some embodiments shown in FIGS. 2, 6, 10, 14 to 15, the outer diameter of the region of the insert member 7 on the compressor impeller side of the insert-side recess 75 described later is the diameter D. It may be formed to have a smaller diameter than that, but even in this case, the diameter D is fitted to the inner peripheral surface 106b of the bearing housing 106 with a gap of about a fitting tolerance as described above. It shall represent the diameter of the outer peripheral surface 73 when formed as described above.

As shown in FIGS. 2, 6, 10, 14 to 16, in some embodiments, the axial region 92 is a region on the compressor impeller side of the bearing housing side recess 107. For example, as shown in FIG. 2, a tapered surface 107a is formed on the wall surface of the bearing housing side recess 107 on the compressor impeller side. The tapered surface 107a is a conical surface formed so that the diameter increases from the compressor impeller side toward the turbine impeller side, that is, from the left side in the drawing to the right side in the drawing in FIG. 2. In the embodiment shown in FIG. 2, the axial region 92 is a region of the tapered surface 107a of the bearing housing side recess 107 on the compressor impeller side of the end portion of the bearing housing 106 on the inner peripheral surface 106b side.

As shown in FIGS. 2, 6, 10, 14 to 16, in some embodiments, the impeller neighborhood outer peripheral region 93 is, for example, a circle in which the radial region 91 and the axial region 92 overlap. It is a region exhibiting a ring shape.

In some embodiments shown in FIGS. 2, 6, 10, 14 to 15, the end face 74 and the facing surface 71 on the compressor impeller side of the insert member 7 are present on the same plane, but the end faces are present. The region of the 74 other than the facing surface 71 and the facing surface 71 may be formed at positions shifted along the extending direction of the rotation axis 2. That is, there may be a step on the end face 74.

As described above, according to some embodiments, since the facing surface 71 is formed in the outer peripheral region 93 near the impeller, the space 119 between the back surface 105c of the compressor impeller 105 and the insert assembly 1, that is, the figure. The space corresponding to the space 118 in 21 can be reduced. As a result, the air in the space 119 is agitated by the rotation of the compressor impeller 105, so that the air in the space 119 is heated and the compressor impeller 105 can be prevented from being heated, and the compression efficiency in the compressor 10 can be suppressed. Can be suppressed.

In some embodiments shown in FIGS. 2, 6, 10, 14 to 16, the facing surface 71 is located in the radial region 91 with respect to the position of the radial inner end 81 of the regulatory member 8. The outer peripheral side facing portion 71a (see FIG. 2) facing the back surface 105c of the compressor impeller 105 in the radial outer region is included.

As described above, in the conventional compressor 10M, there is a space 118 for fitting the annular movement restricting member 8M into the inner peripheral groove (groove 106m) of the bearing housing 106. In order to fit the movement restricting member 8M into the groove 106m of the bearing housing 106, the outer diameter of the annular movement restricting member 8M is set so as to be smaller than the inner diameter of the inner peripheral surface 106b of the bearing housing 106. The movement restricting member 8M in the contracted state is inserted into the bearing housing 106 from the compressor impeller side. Therefore, in the bearing housing 106, the annular range from the inner peripheral surface 106b of the bearing housing 106 to the inner peripheral surface (diametrically inner end 81) of the movement restricting member 8M in a state where the outer diameter is reduced as described above. The movement restricting member 8M cannot be fitted into the groove 106m of the bearing housing 106 unless there is at least a space. Therefore, in the conventional compressor 10M, the range from the inner peripheral surface 106b of the bearing housing 106 to the radial inner end 81 of the movement restricting member 8M in the state where the outer diameter is reduced as described above is at least an annular space. It is 118.

On the other hand, in some embodiments shown in FIGS. 2, 6, 10, 14 to 16, the facing surface 71 is a radial inner end portion of the restricting member 8 in the radial region 91. The outer peripheral side facing portion 71a facing the back surface 105c of the compressor impeller 105 in the region radially outside the position of 81 is included. Therefore, the space 119 can be made smaller than the space 118 of the conventional compressor 10M. This makes it possible to suppress a decrease in compression efficiency in the compressor 10.

In some embodiments shown in FIGS. 2, 6, 10, 14 to 15, the facing surface 71 is formed on the insert member 7.
As a result, it is not necessary to provide another member for forming the facing surface 71, and it is possible to prevent the configuration of the compressor 10 from becoming complicated.

In some embodiments shown in FIGS. 2, 6, 10, 14 to 15, the insert member 7 is composed of an insert-side recess 75 formed on the outer peripheral surface 73 of the insert member 7 and an insert-side recess 75. It includes a radial region 94 outside the bottom surface 76 and an outer peripheral portion 77 near the impeller formed in a region 96 where the axial region 95 on the compressor impeller side of the insert side recess 75 overlaps (see FIGS. 1 and 2). ).
The insert-side recess 75 includes a bottom surface 76 having a diameter smaller than the outer peripheral surface 73 of the insert member 7, a wall surface 171 on the turbine impeller side, and a wall surface 172 on the compressor impeller side (FIGS. 2, FIG. 6, FIG. 10, FIG. 14).
In FIG. 1, the intersecting hatched regions is the outer peripheral portion 77 near the impeller.

Further, in some embodiments shown in FIGS. 2, 6, 10, and 14 to 15, at least a part of the facing surface 71 is formed on the outer peripheral portion 77 near the impeller.
As a result, the space 119 can be made smaller than the space 118 of the conventional compressor 10M. This makes it possible to suppress a decrease in compression efficiency in the compressor 10.
In some embodiments shown in FIGS. 2, 6, 10, 14 to 15, the outer peripheral portion 77 near the impeller is formed as a part of the insert member 7, but the outer peripheral portion 77 near the impeller is formed. , May be formed on a member different from the insert member 7. That is, the outer peripheral portion 77 in the vicinity of the impeller may be configured to be detachably attached to the insert member 7.

In some embodiments shown in FIGS. 2, 6, 10, 14, and 15, the insert member 7 has a radial region 99 inside the bottom surface 76 of the insert-side recess 75, as shown in FIG. Includes an inner peripheral portion 79 formed in. The end face of the inner peripheral portion 79 on the compressor impeller side is formed flush with the end face of the outer peripheral portion 77 in the vicinity of the impeller on the compressor impeller side. In this case, the end surface of the inner peripheral portion 79 on the compressor impeller side is formed flush with the facing surface 71. That is, in some embodiments, a surface flush with the facing surface 71 may be formed on the inner peripheral portion 79.
As a result, the space 119 can be made even smaller than the space 118 of the conventional compressor 10M. Thereby, the decrease in the compression efficiency in the compressor 10 can be further suppressed.

When the bottom surface 76 of the insert-side recess 75 is located radially outside the radial inner boundary in the radial region 91, a part of the radial region 99 and a part of the radial region 91 overlap. .. In this case, the facing surface 71 may be formed in a part of the radial region 99.

For example, as shown in FIG. 10, in some embodiments, a tapered surface 75a is formed on the wall surface 171 on the turbine impeller side of the insert-side recess 75. The tapered surface 75a is a conical surface formed so that the diameter increases from the compressor impeller side to the turbine impeller side, that is, from the left side in the drawing to the right side in the drawing.

In some embodiments shown in FIGS. 2, 6, 10, 14 to 16, the bearing housing side recess 107 is formed over the entire circumference of the inner peripheral surface 106b of the bearing housing 106. In some embodiments shown in FIGS. 2, 6, 10, and 14 to 16, the insert-side recess 75 is formed over the entire circumference of the outer peripheral surface of the insert member 7. In some embodiments shown in FIGS. 2, 6, 10, 14 to 16, the regulating member 8 is, for example, as shown in FIGS. 3 and 7, with respect to the center line CL of the regulating member 8. Includes a ring-shaped member 8a extending in the circumferential direction. The ring-shaped member 8a may have a joint portion 8b as shown in FIGS. 3 and 7. The ring-shaped member 8a does not have to have the abutment portion 8b. The abutment portion 8b is a portion where one end and the other end of the ring-shaped member 8a in the circumferential direction face each other with a gap.

In some embodiments shown in FIGS. 2, 6, 10, 14 to 15, the ring-shaped member 8a is an outer peripheral portion inserted into the bearing housing side recess 107 as shown in FIGS. 3 and 7. It has 84 and an inner peripheral portion 85 to be inserted into the insert side recess 75.
Details of the regulatory member 8 shown in FIGS. 3 and 7 will be described later.
In some embodiments, the regulatory member 8 includes a ring-shaped member 8a, which simplifies the configuration of the regulatory member 8.

In some embodiments shown in FIGS. 2, 6 and 16, the ring-shaped member 8a is inserted into the bearing housing side recess 107 and the insert side recess 75 in a state where the diameter is reduced from the natural state. It is composed.
In this way, by inserting the ring-shaped member 8a into the bearing housing side recess 107 and the insert side recess 75 in a state where the diameter is reduced from the natural state, the insert member 7 moves to the compressor impeller side with respect to the bearing housing 106. You can regulate what you do. Thereby, with a simple configuration, it is possible to restrict the insert member 7 from moving toward the compressor impeller side with respect to the bearing housing 106.

The natural state of the ring-shaped member 8a is a state in which an external force in the radial direction that expands or reduces the diameter of the ring-shaped member 8a does not act.

In some embodiments shown in FIGS. 2, 6 and 16, the outer diameter of the ring-shaped member 8a in the state of being inserted into the bearing housing side recess 107 is equal to or less than the outer diameter in the natural state. Therefore, the ring-shaped member 8a is locked to the bearing housing side recess 107 and does not come off from the bearing housing side recess 107. Therefore, it is possible to restrict the insert member 7 from moving toward the compressor impeller side with respect to the bearing housing 106. Thereby, with a simple configuration, it is possible to restrict the insert member 7 from moving toward the compressor impeller side with respect to the bearing housing 106.

In some embodiments shown in FIGS. 10 and 14, the ring-shaped member 8a is configured to be inserted into the bearing housing side recess 107 and the insert side recess 75 in a state where the diameter is larger than the natural state.
In this way, by inserting the ring-shaped member 8a into the bearing housing side recess 107 and the insert side recess 75 in a state where the diameter of the ring-shaped member 8a is larger than the natural state, the insert member 7 moves to the compressor impeller side with respect to the bearing housing 106. You can regulate what you do. Thereby, with a simple configuration, it is possible to restrict the insert member 7 from moving toward the compressor impeller side with respect to the bearing housing 106.

In some embodiments shown in FIGS. 10 and 14, the inner diameter of the ring-shaped member 8a in the state of being inserted into the insert-side recess 75 is equal to or larger than the inner diameter in the natural state. Therefore, the ring-shaped member 8a is locked to the insert-side recess 75 and does not come off from the insert-side recess 75. Therefore, it is possible to restrict the insert member 7 from moving toward the compressor impeller side with respect to the bearing housing 106. Thereby, with a simple configuration, it is possible to restrict the insert member 7 from moving toward the compressor impeller side with respect to the bearing housing 106.

The regulatory member 8 according to some embodiments shown in FIGS. 2 and 10 will be described with reference to FIG. The regulating member 8A of the embodiment shown in FIG. 3 is the regulating member 8 used in the insert assembly 1 according to the embodiment shown in FIG. 2, and is elastically deformed in the radial direction so that the diameter can be expanded or reduced.
The ring-shaped member 8a in the regulatory member 8A of the embodiment shown in FIG. 3 has a tapered surface 8c for urging the insert member 7 toward the side opposite to the compressor impeller 105.
In the embodiment shown in FIGS. 2 and 3, the ring is formed on one side of the ring-shaped member 8a in the axial direction, that is, on the outer diameter side of the left end surface shown in FIG. 2, for example, as it goes outward in the radial direction. A tapered surface 8c is formed on the ring-shaped member 8a of the regulating member 8A so that the axial dimension of the shaped member 8a becomes smaller. The tapered surface 8c in the embodiments shown in FIGS. 2 and 3 is also referred to as a first tapered surface 8p. That is, the first tapered surface 8p is a tapered surface formed on one of the two end faces separated along the center line CL, which faces the back surface 105c of the compressor impeller 105.

Further, in the embodiment shown in FIG. 10, the ring-shaped member 8a is formed on the other side surface in the axial direction of the ring-shaped member 8a, that is, on the inner diameter side of the right end surface shown in FIG. A tapered surface 8c is formed on the ring-shaped member 8a of the regulating member 8C so that the dimension in the axial direction becomes small. The tapered surface 8c in the embodiment shown in FIG. 10 is also referred to as a second tapered surface 8q. That is, the second tapered surface 8q is a tapered surface formed on the other end surface of the two end faces separated along the center line CL, which is different from the one end surface facing the back surface 105c of the compressor impeller 105.

As a result, for example, in the insert assembly 1 according to the embodiment shown in FIGS. 2 and 3, the ring-shaped member 8a is a member on the other side of the first tapered surface 8p due to the force that the ring-shaped member 8a tries to expand in diameter. By pressing the tapered surface 107a of the bearing housing side recess 107, the insert member 7 can be urged toward the side opposite to the compressor impeller by the reaction force acting on the ring-shaped member 8a. In the insert assembly 1 according to the embodiment shown in FIGS. 2 and 3, the tapered surface 8c of the ring-shaped member 8a and the tapered surface 107a of the bearing housing side recess 107 come into contact with each other.

Further, for example, in the insert assembly 1 according to the embodiment shown in FIG. 10, the ring-shaped member 8a is a member on the other side of the second tapered surface 8q due to the force that the ring-shaped member 8a tries to reduce in diameter. By pressing the tapered surface 75a of the 75, the insert member 7 can be urged toward the side opposite to the compressor impeller by the reaction force acting on the ring-shaped member 8a. In the insert assembly 1 according to the embodiment shown in FIG. 10, the tapered surface 8c of the ring-shaped member 8a and the tapered surface 75a of the insert-side recess 75 abut against each other.

The tapered surface 8c does not necessarily have to be formed on the ring-shaped member 8a. Further, the tapered surface 107a does not necessarily have to be formed in the bearing housing side recess 107. Similarly, the tapered surface 75a does not necessarily have to be formed in the insert-side recess 75.

In one embodiment shown in FIG. 10, the insert member 7 has one side end 74a, the other side end 74b, and a tapered portion 78, as shown in FIG. The one side end portion 74a is an end portion of the insert member 7 in the axial direction facing the back surface 105c of the compressor impeller 105. The other side end portion 74b is an end portion on the opposite side of the one side end portion 74a along the axial direction of the insert member 7. The tapered portion 78 is a tapered portion whose outer diameter increases from the other end portion 74b toward the compressor impeller side.
As shown in FIG. 11, the outer diameter Da of the other end portion 74b of the tapered portion 78 is larger than the inner diameter Db of the ring-shaped member 8a of the regulation member 8C which is fitted in the bearing housing side recess 107 and is in a natural state. small.
As a result, in the method of assembling the compressor 10 described later, the tapered portion 78 is formed into a ring shape by inserting the insert member 7 into the bearing housing 106 in which the ring-shaped member 8a is previously inserted into the bearing housing side recess 107. The insert member 7 can be inserted into the bearing housing 106 while being inserted into the inner circumference of the member 8a and the diameter of the ring-shaped member 8a is expanded by the tapered portion 78.

The regulatory member 8 according to some embodiments shown in FIGS. 6 and 14 will be described with reference to FIG. 7. The regulatory member 8B of the embodiment shown in FIG. 7 is the regulatory member 8 used in the insert assembly 1 according to the embodiment shown in FIGS. 6 and 14.
The ring-shaped member 8a in the regulating member 8B of one embodiment shown in FIG. 7 is a corrugated ring-shaped member 8k having a meandering shape on one side and the other side along the center line CL.
That is, as the ring-shaped member 8a in the regulating member 8B advances along the circumferential direction, protrusions 8d projecting on one side and the other side in the axial direction, that is, in the upward direction and the downward direction in the drawing alternately appear. It is configured as follows. The ring-shaped member 8a in the regulating member 8B is elastically deformed in the radial direction to be able to expand and contract in diameter, and has a protrusion 8d protruding upward in the drawing and a protrusion 8d protruding downward in the drawing. And can be elastically deformed so as to approach each other along the vertical direction shown in the figure.

As a result, for example, in the insert assembly 1 according to the embodiment shown in FIGS. 6 and 7, the ring-shaped member 8a of the restricting member 8B shown in FIG. By pressing the wall surface on the compressor impeller side of the side recess 107, the insert member 7 can be urged toward the side opposite to the compressor impeller by the reaction force acting on the ring-shaped member 8a.

Further, in the insert assembly 1 according to the embodiment shown in FIG. 14, the ring-shaped member 8a of the regulating member 8B shown in FIG. 7 is placed on the turbine impeller side of the insert-side recess 75 due to the force to reduce the diameter. By pressing the wall surface 171 of the insert member 7, the insert member 7 can be urged toward the side opposite to the compressor impeller by the reaction force acting on the ring-shaped member 8a.

According to the regulating member 8B of one embodiment shown in FIG. 7, the insert member 7 is placed on the opposite side of the compressor impeller 105 by utilizing the elastic force in the direction along the center line CL of the corrugated ring-shaped member 8a. You can urge towards. That is, the wall surface of the bearing housing side recess 107 on the compressor impeller side and the wall surface of the insert side recess 75 opposite to the compressor impeller 105, which are in contact with the corrugated ring from the direction along the center line CL, are waved. The insert member can be urged toward the side opposite to the compressor impeller by urging the ring-shaped member 8a of the mold so as to be separated from each other by the elastic force in the axial direction.

The regulating member 8 does not have to be a ring-shaped member as shown in FIGS. 3 and 7, and the outer diameter side is a recess on the bearing housing side as in the regulating member 8D according to the embodiment shown in FIG. 15, for example. It may include a claw member 8f that is inserted into 107 and is configured such that the inner diameter side is inserted into the insert side recess 75, and a urging member 8g that urges the claw member 8f outward in the radial direction.
Thereby, the claw member 8f configured to be inserted into the bearing housing side recess 107 and the insert side recess 75 can restrict the insert member from moving toward the compressor impeller side with respect to the bearing housing.

For example, when the ring-shaped member 8a described above is used, the bearing housing side recess 107 is formed over substantially the entire circumference of the inner peripheral surface of the bearing housing 106, and the insert side recess 75 is formed substantially on the outer peripheral surface of the insert member 7. It needs to be formed over the circumference.
In that respect, according to the embodiment shown in FIG. 15, the size of the bearing housing side recess 107 and the insert side recess 75 may be any size as long as the claw member 8f can be inserted. Therefore, the size of the bearing housing side recess 107 and the insert side recess 75 in the circumferential direction can be suppressed. As a result, it is possible to suppress a decrease in strength of the bearing housing 106 and the insert member 7.

Although not shown, the regulating member 8 includes a claw member 8f such as the regulating member 8D according to the embodiment shown in FIG. 15, and a urging member 8g that urges the claw member 8f inward in the radial direction. And may be included.

In addition, as in one embodiment shown in FIG. 16, the facing surface 71 may be formed on the regulating member 8. The regulatory member 8 according to the embodiment shown in FIG. 16 has an annular plate portion 8h forming a facing surface 71 attached to the ring-shaped member 8a of the regulatory member 8A shown in FIG. 3 via a connecting portion 8i. It is said to be composed.
That is, in one embodiment shown in FIG. 16, the restricting member 8 includes a ring-shaped member 8a in which at least a part thereof is inserted into the bearing housing side recess 107, and an annular plate portion 8h facing the back surface 105c of the compressor impeller 105. It includes a connecting portion 8i that connects the ring-shaped member 8a and the annular plate portion 8h. Then, at least a part of the facing surface 71 is formed on the annular plate portion 8h.
As a result, it is not necessary to provide another member for forming the facing surface 71, and it is possible to prevent the configuration of the compressor 10 from becoming complicated.

In one embodiment shown in FIG. 16, the insert member 7 includes an insert step portion 175. The insert step portion 175 includes a small diameter portion 176 having a diameter smaller than that of the outer peripheral surface 73 of the insert member 7, and a wall surface 177 connecting the outer peripheral surface 73 and the outer peripheral surface 176a of the small diameter portion 176. The small diameter portion 176 is formed on the compressor impeller side in the insert member 7. In one embodiment shown in FIG. 16, the portion of the insert member 7 on the turbine impeller side with respect to the wall surface 177 is also referred to as a large diameter portion 178.
In one embodiment shown in FIG. 16, the first tapered surface 8p of the ring-shaped member 8a presses the tapered surface 107a of the bearing housing side recess 107, so that the ring-shaped member 8a is opposed to the side opposite to the compressor impeller. Force is generated. In one embodiment shown in FIG. 16, the reaction force can press the wall surface 177 of the insert member 7 with the front end surface 8r of the ring-shaped member 8a toward the side opposite to the compressor impeller.

In one embodiment shown in FIG. 16, by forming the facing surface 71 on the regulating member 8, the space 119 can be made smaller than the space 118 of the conventional compressor 10M by the regulating member 8 having a relatively simple shape. can. This makes it possible to suppress a decrease in compression efficiency in the compressor 10.

In the compressor 10 according to some of the above-described embodiments, the insert member 7 can be removed from the bearing housing 106 as follows.
FIG. 17 is an example of a view of the bearing housing 106 and the insert member 7 according to the embodiment shown in FIGS. 2 and 6 as viewed from the compressor impeller side. FIG. 18 is another example of the view of the bearing housing 106 and the insert member 7 according to the embodiment shown in FIGS. 2 and 6 as viewed from the compressor impeller side. FIG. 19 is an example of a view of the bearing housing 106 and the insert member 7 according to the embodiment shown in FIGS. 10 and 14 as viewed from the compressor impeller side. FIG. 20 is another example of the view of the bearing housing 106 and the insert member 7 according to the embodiment shown in FIGS. 10 and 14 as viewed from the compressor impeller side.

In the embodiment shown in FIG. 17, the bearing housing 106 is formed with a bearing housing side axial space 151 communicating from the back surface side of the compressor impeller 105 to the bearing housing side recess 107.
The bearing housing side axial space 151 shown in FIG. 17 is formed at a position accessible to one end and the other end in the circumferential direction of the restricting members 8, 8A and 8B.
It is preferable that the insert member 7 also has the insert portion side axial space 152 formed in the radial direction of the bearing housing side axial space 151.

In the embodiment shown in FIG. 17, the ring-shaped restricting members 8, 8A, and 8B inserted into the bearing housing side recess 107 can be accessed from the bearing housing side axial space 151. Therefore, for example, the bearing housing side axial space 151 can be accessed. For example, a jig is inserted into the hole 8j formed in the vicinity of one end and the other end in the circumferential direction of the regulating members 8, 8A, 8B, and the jig is locked to the joints 8b by the jig. As a result, the regulating members 8, 8A, and 8B can be made to have a smaller diameter than the natural state. As a result, the regulation by the restricting members 8, 8A and 8B can be released, and the insert member 7 can be moved to the compressor impeller side, so that the insert member 7 can be removed from the bearing housing 106.

In the embodiment shown in FIG. 18, the bearing housing 106 has a bearing housing side axial space 153 that communicates from the back surface side of the compressor impeller 105 to the bearing housing side recess 107.
The bearing housing side axial space 153 shown in FIG. 18 is formed at three or more locations at positions accessible to the radial outside of the regulating members 8, 8A, 8B at intervals in the circumferential direction.
In the radial inside of the bearing housing side axial space 153, the insert portion side axial space 154 may also be formed in the insert member 7.

In the embodiment shown in FIG. 18, since the outer peripheral surfaces of the ring-shaped restricting members 8, 8A and 8B inserted into the bearing housing side recess 107 can be accessed from the bearing housing side axial space 153, for example, the bearing at each position. For example, by inserting a jig into the axial space 153 on the housing side and shrinking the regulating members 8, 8A, 8B inward in the radial direction by the jig, the regulating members 8, 8A, 8B are reduced in diameter from the natural state. Can be made to. As a result, the regulation by the restricting members 8, 8A and 8B can be released, and the insert member 7 can be moved to the compressor impeller side, so that the insert member 7 can be removed from the bearing housing 106.

In the embodiment shown in FIG. 19, the insert member 7 has an insert-side axial space 155 that communicates from the back surface side of the compressor impeller 105 to the insert-side recess 75.
The insert-side axial space 155 shown in FIG. 19 is formed at a position accessible to one end and the other end in the circumferential direction of the restricting members 8, 8B and 8C.
It is preferable that the bearing housing side axial space 156 is also formed in the bearing housing 106 on the radial outer side of the insert side axial space 155.

In the embodiment shown in FIG. 19, the ring-shaped restricting members 8, 8B, and 8C inserted into the insert-side recess 75 can be accessed from the insert-side axial space 155. Therefore, for example, a jig is placed in the insert-side axial space 155. By inserting the jig, the jig is locked in the holes 8j formed in the vicinity of one end and the other end in the circumferential direction of the regulating members 8, 8B and 8C, and the joints 8b are separated from each other by the jig. The regulating members 8, 8B and 8C can be made to have a larger diameter than the natural state. As a result, the regulation by the restricting members 8, 8B and 8C can be released, and the insert member 7 can be moved to the compressor impeller side, so that the insert member 7 can be removed from the bearing housing 106.

In the embodiment shown in FIG. 20, the insert member 7 is formed with an insert-side axial space 157 that communicates with the insert-side recess 75 from the back surface side of the compressor impeller 105.
The insert-side axial space 157 shown in FIG. 20 is formed at three or more locations at positions accessible to the inside of the restricting members 8, 8B, 8C in the radial direction at intervals in the circumferential direction.
It is preferable that the bearing housing side axial space 158 is also formed in the bearing housing 106 on the radial outer side of the insert side axial space 157.

In the embodiment shown in FIG. 20, since the inner peripheral surface of the ring-shaped restricting members 8, 8B, 8C inserted into the insert side recess 75 can be accessed from the insert side axial space 157, for example, the insert side at each position. By inserting a jig into the axial space 157 and expanding the regulating members 8, 8B, 8C outward in the radial direction, the regulating members 8, 8B, 8C can be made to have a larger diameter than the natural state. As a result, the regulation by the restricting members 8, 8B and 8C can be released, and the insert member 7 can be moved to the compressor impeller side, so that the insert member 7 can be removed from the bearing housing 106.

Next, a method of assembling the compressor according to some embodiments will be described.
FIG. 22 is a flowchart showing a procedure of a compressor assembly method according to the embodiment shown in FIGS. 2 and 6. The method of assembling the compressor shown in FIG. 22 includes a diameter reduction step S10, an insertion step S20, and a locking step S30.

The diameter reduction step S10 is, for example, as shown in FIGS. 4 and 8, a step in which the inner peripheral side reduces the diameter of the regulating members 8, 8A, 8B inserted into the insert side recess 75 from the natural state. In the diameter reduction step S10, the restricting members 8, 8A, and 8B whose inner peripheral side is inserted into the insert side recess 75 by covering the outer peripheral surface 73 of the insert member 7 with a cylindrical jig (not shown) are attached to the insert member 7. The diameter can be reduced to the same size as the outer peripheral surface 73.

The insertion step S20 is a step of inserting the insert member 7 into the bearing housing 106 in a state where the regulating members 8, 8A, and 8B are reduced in diameter from the natural state. In the insertion step S20, the insert member 7 is inserted into the bearing housing 106 while maintaining the reduced diameters of the restricting members 8, 8A and 8B as described above.

The locking step S30 is a step of inserting the outer peripheral side of the regulating members 8, 8A, 8B into the bearing housing side recess 107. In the locking step S30, the restricting members 8, 8A, 8B are axially moved to the position of the bearing housing side recess 107 by inserting the insert member 7, and the regulating members 8, 8A, 8B are expanded by their own elastic force. The diameter is adjusted and fitted into the bearing housing side recess 107 as shown in FIGS. 5 and 9. As a result, the insert member 7 is locked to the bearing housing 106.

According to the method of assembling the compressor shown in FIG. 22, the insert member 7 is inserted into the bearing housing 106 in a state where the regulating members 8, 8A and 8B are reduced in diameter from the natural state, and then the regulating member 8 is inserted. By inserting the outer peripheral sides of 8, 8A and 8B into the bearing housing side recess 107, it is possible to restrict the insertion member 7 from moving toward the compressor impeller side with respect to the bearing housing 106. This makes it possible to simplify the method of assembling the compressor 10.

FIG. 23 is a flowchart showing the procedure of the method of assembling the compressor according to the embodiment shown in FIGS. 10 and 14. The method of assembling the compressor shown in FIG. 23 includes a diameter expansion step S50, an insertion step S60, and a locking step S70.

The diameter expansion step S50 is, for example, as shown in FIG. 12, a step in which the outer peripheral side of the regulating members 8, 8B, 8C inserted into the bearing housing side recess 107 is expanded in diameter from the natural state. In the diameter expansion step S50, by inserting the insert member 7 into the bearing housing 106, as shown in FIG. 12, the inner end 81 of the restricting members 8, 8B, 8C is radially outward with the tapered portion 78. Move to increase the diameter of the regulating members 8, 8B and 8C.
As described in the description with reference to FIG. 11, the outer diameter Da of the other side end portion 74b of the tapered portion 78 is the regulating member 8, 8B, 8C which is fitted in the bearing housing side recess 107 and is in a natural state. It is smaller than the inner diameter Db of the ring-shaped member 8a.
Therefore, by inserting the insert member 7 inside the bearing housing 106, the tapered portion 78 is inserted into the inner circumference of the ring-shaped member 8a, and the diameter of the ring-shaped member 8a is expanded by the tapered portion 78 while the diameter of the ring-shaped member 8a is expanded. The insert member 7 can be inserted inside.

The insertion step S60 is a step of inserting the insert member 7 into the bearing housing 106 in a state where the regulating members 8, 8B, and 8C have a larger diameter than in the natural state. In the insertion step S60, the insert member 7 is inserted into the bearing housing 106 while maintaining the expanded state of the regulating members 8, 8B and 8C as described above.

The locking step S70 is a step of inserting the inner peripheral side of the regulating members 8, 8B, 8C into the insert side recess 75. In the locking step S70, the restricting members 8, 8B, 8C are axially moved to the position of the insert side recess 75 by inserting the insert member 7, and the regulating members 8, 8B, 8C are reduced in diameter by their own elastic force. Then, as shown in FIG. 13, it is fitted into the insert-side recess 75. As a result, the insert member 7 is locked to the bearing housing 106.

According to the method of assembling the compressor shown in FIG. 23, the insert member 7 is inserted into the bearing housing 106 with the regulating members 8, 8B and 8C having a larger diameter than the natural state, and then the regulating member 8 is used. By inserting the inner peripheral side of, 8B, 8C into the insert side recess 75, it is possible to restrict the insert member 7 from moving toward the compressor impeller side with respect to the bearing housing 106. This makes it possible to simplify the method of assembling the compressor 10.

The present invention is not limited to the above-described embodiment, and includes a modification of the above-mentioned embodiment and a combination of these embodiments as appropriate.
The compressor 10 described above is configured to be driven by exhaust gas, but may be configured to be driven by, for example, an electric motor or the like.

1 Insert assembly 7 Insert member 8, 8A to 8E Restricting member 8a Ring-shaped member 8c Tapered surface 8f Claw member 8k Wave-shaped ring-shaped member 10 Compressor 71 Facing surface 71a Outer peripheral side facing part 75 Insert side recess 77 Outer peripheral part near impeller 78 Tapered part 100 Turbocharger 105 Compressor impeller 106 Bearing housing 107 Bearing housing side recess 151,153 Bearing housing side axial space 155,157 Insert side axial space

Claims (19)

The insert member inserted inside the bearing housing of the compressor,
An insert assembly of a compressor comprising a restricting member for restricting the insert member from moving toward the compressor impeller side with respect to the bearing housing.
The bearing housing includes a bearing housing side recess formed on the inner peripheral surface of the bearing housing into which a portion of the regulatory member is inserted.
The insert assembly is an impeller that is a region where an outer radial region in an internal space defined by the inner peripheral surface of the bearing housing and an axial region on the compressor impeller side of the bearing housing side recess overlap. It has a facing surface facing the back surface of the compressor impeller, which is formed in the vicinity outer peripheral region.
Compressor insert assembly. The facing surface includes an outer peripheral side facing portion facing the back surface of the compressor impeller in a region of the radial region outside the radial direction of the position of the radial inner end portion of the regulating member.
The insert assembly of the compressor according to claim 1. The facing surface is formed on the insert member.
The insert assembly of the compressor according to claim 1 or 2. The insert member is
The insert-side recess formed on the outer peripheral surface of the insert member,
Includes a radial region outside the bottom surface of the insert-side recess and an outer peripheral portion near the impeller formed in a region where the axial region on the compressor impeller side of the insert-side recess overlaps.
The insert assembly of the compressor according to claim 2 or 3, wherein at least a part of the facing surface is formed on the outer peripheral portion in the vicinity of the impeller. The insert member is
Includes an inner peripheral portion formed in a radial region inside the bottom surface of the insert-side recess.
The insert assembly of the compressor according to claim 4, wherein the end face on the compressor impeller side of the inner peripheral portion is formed flush with the end face on the compressor impeller side of the outer peripheral portion in the vicinity of the impeller. The bearing housing side recess is formed over the entire circumference of the inner peripheral surface of the bearing housing.
The insert-side recess is formed over the entire circumference of the outer peripheral surface of the insert member.
The restricting member includes a ring-shaped member extending in the circumferential direction with respect to the center line.
The insert assembly of a compressor according to claim 4 or 5, wherein the ring-shaped member has an outer peripheral portion inserted into the bearing housing side recess and an inner peripheral portion inserted into the insert side recess. The insert assembly of the compressor according to claim 6, wherein the ring-shaped member has an outer diameter equal to or less than the outer diameter in a state of being inserted into the recess on the bearing housing side. The insert assembly of the compressor according to claim 7, wherein the bearing housing is formed with an axial space on the bearing housing side that communicates from the back surface side of the compressor impeller to the recess on the bearing housing side. The insert assembly of the compressor according to claim 6, wherein the ring-shaped member has an inner diameter of the inner diameter in a state of being inserted into the insert-side concave portion equal to or larger than the inner diameter in a natural state. The insert member is
Of the axial ends of the insert member, one side end facing the back surface of the compressor impeller,
With the other end portion on the opposite side of the one side end portion along the axial direction of the insert member, the outer diameter thereof being smaller than the inner diameter of the ring-shaped member in a natural state. ,
A tapered portion whose outer diameter increases from the other end to the compressor impeller side,
The insert assembly of the compressor according to claim 9. The insert assembly of the compressor according to claim 9 or 10, wherein the insert member is formed with an insert-side axial space communicating from the back surface side of the compressor impeller to the insert-side recess. The ring-shaped member is
A first tapered surface formed on one of the two end faces separated along the center line, which faces the back surface of the compressor impeller, and is said to be radially outward with respect to the center line. A first tapered surface formed so that the dimensions of the ring-shaped member become smaller in the direction along the center line.
Or,
A second tapered surface formed on the other end face of the two end faces, which is different from the one end face, and the ring in the direction along the center line as it goes inward in the radial direction with respect to the center line. The insert assembly of the compressor according to any one of claims 6 to 11, which has any one of the second tapered surfaces formed so as to reduce the size of the shaped member. The ring-shaped member is a corrugated ring-shaped member having a wavy shape meandering on one side and the other side along the center line.
The insert assembly of the compressor according to any one of claims 6 to 11. The regulatory member is
A claw member configured so that the outer diameter side is inserted into the bearing housing side recess and the inner diameter side is inserted into the insert side recess.
Includes an urging member that urges the claw member radially inward or radially outward in the regulatory member.
The insert assembly of the compressor according to claim 4. The face-to-face surface is an insert assembly of the compressor according to claim 1 or 2, which is formed on the regulatory member. The regulatory member is
A ring-shaped member whose at least a part is inserted into the bearing housing side recess,
An annular plate portion facing the back surface of the compressor impeller and
A connecting portion for connecting the ring-shaped member and the annular plate portion is included.
The insert assembly of the compressor according to claim 15, wherein at least a part of the facing surface is formed on the annular plate portion. With the compressor impeller,
With the bearing housing
The insert assembly according to any one of claims 1 to 16.
Compressor equipped with. The insert member inserted inside the bearing housing of the compressor,
A method for assembling a compressor in which an insert assembly of a compressor including a restricting member for restricting the movement of the insert member to the compressor impeller side with respect to the bearing housing is attached to the bearing housing.
The bearing housing includes a bearing housing side recess formed over the entire circumference of the inner peripheral surface of the bearing housing into which a portion of the regulatory member is inserted.
The insert member includes an insert-side recess formed over the entire circumference of the outer peripheral surface of the insert member.
The regulating member includes a ring-shaped member extending in the circumferential direction with respect to the center line of the regulating member.
A step in which the inner peripheral side reduces the diameter of the ring-shaped member inserted into the insert side recess from the natural state, and
A step of inserting the insert member into the bearing housing with the ring-shaped member reduced in diameter from the natural state, and a step of inserting the insert member into the bearing housing.
A step of inserting the outer peripheral side of the ring-shaped member into the recess on the bearing housing side,
How to assemble a compressor. The insert member inserted inside the bearing housing of the compressor,
A method for assembling a compressor in which an insert assembly of a compressor including a restricting member for restricting the movement of the insert member to the compressor impeller side with respect to the bearing housing is attached to the bearing housing.
The bearing housing includes a bearing housing side recess formed over the entire circumference of the inner peripheral surface of the bearing housing into which a portion of the regulatory member is inserted.
The insert member includes an insert-side recess formed over the entire circumference of the outer peripheral surface of the insert member.
The regulating member includes a ring-shaped member extending in the circumferential direction with respect to the center line of the regulating member.
A step in which the outer peripheral side expands the diameter of the ring-shaped member inserted into the bearing housing side recess from the natural state, and
A step of inserting the insert member into the bearing housing in a state where the ring-shaped member has a larger diameter than the natural state.
A step of inserting the inner peripheral side of the ring-shaped member into the insert-side recess,
How to assemble a compressor.

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