JP4868037B2 - Supercharger manufacturing method and supercharger - Google Patents

Description

  The present invention relates to a supercharger that increases the supply pressure of an internal combustion engine and increases the output of the engine, and a method for manufacturing the same, and enables improvement in productivity as well as improvement in compression efficiency.

  Internal combustion engines used in automobiles and the like are equipped with a supercharger to improve combustion efficiency, and the supercharger uses the energy of exhaust gas to compress air and supply the air to the internal combustion engine. It has become.

  The supercharger includes a turbine section rotated by exhaust gas and a compressor section that sucks and compresses air. The outline will be described with reference to FIG. In FIG. 9, 1 is a turbine part, 2 is a bearing part, 3 has shown the compressor part.

  A turbine housing 5 is provided on one end side of the bearing housing 4, a compressor housing 6 is provided on the other end side, a rotating shaft 7 is rotatably provided on the bearing housing 4, and a turbine is provided at one end of the rotating shaft 7. An impeller 8 is provided. A compressor impeller 9 is provided at the other end of the rotating shaft 7. The turbine wheel 8 is made of a heat-resistant material such as heat-resistant steel, and the compressor wheel 9 is made of a lightweight material such as aluminum.

  An exhaust gas inlet 11 is provided at a circumferential position of the turbine housing 5, and exhaust gas from an internal combustion engine (not shown) is guided to the exhaust gas inlet 11. An exhaust gas outlet 12 is provided coaxially with the rotating shaft 7 of the turbine housing 5, and the exhaust gas outlet 12 is connected to an exhaust pipe (not shown) or the like.

  An intake port 13 is provided coaxially with the rotary shaft 7 of the compressor housing 6, and outside air is sucked from the intake port 13. A discharge port 14 is provided at a required circumferential position of the compressor housing 6, and the discharge port 14 is connected to an air supply port of an internal combustion engine (not shown).

  High-temperature and high-pressure exhaust gas flows from the exhaust gas inlet 11, rotates the turbine impeller 8, and is exhausted from the exhaust gas outlet 12. The compressor impeller 9 is rotated through the rotating shaft 7 by the rotation of the turbine impeller 8 and the outside air is sucked from the intake port 13. The outside air is compressed by the rotation of the compressor impeller 9 and the pressure is increased. Is supplied to the internal combustion engine (not shown) through the discharge port 14.

  In the compressor section 3, a pressure increasing chamber 15 is formed around the compressor impeller 9 inside the compressor housing 6, and the outside air sucked from the intake port 13 is compressed by the rotation of the compressor impeller 9. Then, the gas is discharged from the discharge port 14 through the pressure increasing chamber 15. For this reason, a pressure difference is generated between the intake port 13 and the booster chamber 15, and the curved portion (shroud portion) 16 from the intake port 13 of the compressor housing 6 to the booster chamber 15 is the most in the compressor impeller 9. The approaching part is a pressure boundary part.

  By reducing the gap between the shroud portion 16 and the compressor impeller 9 as much as possible, leakage at the pressure boundary portion can be reduced and the compression efficiency of the compressor portion 3 can be improved.

  Therefore, efforts are made to minimize the gap between the compressor wheel 9 and the shroud portion 16 at the time of design and manufacture. On the other hand, the compressor wheel 9 is a rotating body, and when there is an eccentricity, the compressor wheel 9 may come into contact with the shroud portion 16. Further, displacement due to thermal expansion is also considered due to heat conduction from the turbine section 1 side, and when the gap is reduced, the compressor impeller 9 and the shroud section 16 may come into contact with each other. As described above, the compressor wheel 9 is made of aluminum. If the compressor wheel 9 contacts the shroud portion 16, the compressor wheel 9 is damaged.

  For this reason, as shown in Patent Document 1, a soft sliding member is provided in a portion of the shroud portion 16 that may come into contact with the compressor impeller 9 so that the sliding member and the compressor impeller 9 are in contact with each other. Even so, the compressor wheel 9 is not damaged by cutting or deforming the sliding member.

  In Patent Document 1, when the sliding member 17 is attached to the shroud portion 16 as seen in FIG. 10, a groove 18 is formed in the shroud portion 16, and a C-ring 19 that can be expanded and contracted is fitted into the groove 18. The sliding member 17 is fixed to the shroud portion 16 through the C ring 19.

  In the said patent document 1, fixation with the sliding member 17 and the shroud part 16 is performed with the C ring 19, and the number of parts has increased. Further, since the C-ring 19 is fitted to the sliding member 17 in advance in the assembly process, and the sliding member 17 is fitted to the shroud portion 16 while the C-ring 19 is narrowed, manual work is required and workability is improved. Have the problem of being bad.

Japanese Patent Laid-Open No. 11-173153

  In view of such circumstances, the present invention provides a supercharger capable of performing highly accurate dimensional management, improving the compression efficiency of the compressor section, and having high productivity.

According to the present invention, a recess for injecting a sliding member is formed in the shroud portion of the compressor housing, and a protrusion or a groove is formed in the recess, and a space in which the recess is closed is brought into close contact with the shroud portion. The invention relates to a method of manufacturing a supercharger in which a resin is injected into the space , the recess is filled, and a sliding member is injection-molded in the shroud so as to form a part of the compressor housing .

  The present invention also relates to a method of manufacturing a supercharger in which the molding die has at least a portion that abuts the compressor housing and has an outer dimension substantially equivalent to that of a compressor wheel.

  The present invention also relates to a method of manufacturing a supercharger in which a resin insertion hole that opens into the space is provided in the mold, and a resin is injected from the resin insertion hole.

  The present invention also relates to a method of manufacturing a supercharger in which a resin insertion hole that opens into the space is provided in the compressor housing, and resin is injected from the resin insertion hole.

The present invention, the both sides of the compressor housing fitted mold to form a space in which the recess is closed by one of the mold, to form a gap between the mold and the said closure with said gap and a space communicated over the entire circumference, the resin is injected into the center of the gap, which relate to the resin in the space in the radial direction of the uniform flow in the manufacturing method of the Filling to that supercharger.

Furthermore, the present invention forms a ridge or groove in the recess to form a recess for the slip member injected into the shroud portion of the compressor housing, one slip member of the compressor housing is filled with a resin to recess The sliding member formed by injection molding so as to form a part relates to a supercharger that is pulled out by the protrusion or groove .

According to the present invention, the concave portion for injecting the sliding member is formed in the shroud portion of the compressor housing , the protrusion or the groove is formed in the concave portion, and the molding die is brought into close contact with the shroud portion, thereby closing the concave portion . A space is formed, resin is injected into the space, the recess is filled, and a sliding member is injection-molded in the shroud so as to form a part of the compressor housing. Therefore, the sliding member is separately manufactured and further assembled. Since it is not necessary, the productivity is improved and the manufacturing error of a single part is eliminated, so that the accuracy is improved.

Further, according to the present invention, the both sides of the compressor housing fitted mold to form a space in which the recess is closed by one of the mold, to form a gap between the mold and the the the gap the enclosed space to communicate with the entire circumference, the resin is injected into the center of the gap, as they may be Hama resin into said space in the radial direction of the uniform flow charge, the direction of the resin to be molded The fixed and molded resin becomes homogeneous, exhibits excellent effects such as preventing thermal deformation and improving mechanical properties.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall sectional view showing a part of a supercharger to which the present invention is applied. It is explanatory drawing which shows the 1st Example of this invention. It is sectional drawing which shows a 1st Example before the same. It is explanatory drawing which shows the 2nd Example of this invention. It is sectional drawing which shows a 2nd Example before the same. It is sectional drawing which shows the modification of a 2nd Example before the same. It is explanatory drawing which shows the 3rd Example of this invention. It is sectional drawing which shows a 3rd Example before the same. It is the schematic of a supercharger. It is sectional drawing which shows a prior art example.

Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows an outline of a supercharger in which the present invention is implemented. In FIG. 1, the same components as those shown in FIG. 9 are denoted by the same reference numerals. In FIG. 1, only the compressor section 3 is broken.

  A sliding member 20 is provided on the shroud portion 16 of the compressor housing 6 by injection molding. By providing the sliding member 20 by injection molding, it is possible to eliminate errors during assembly of parts and assembly errors as compared with the case where the sliding member 20 is provided as a single unit, and the number of parts is reduced and further the sliding member is provided. 20 manual assembly operations can be omitted.

2, a first example will be described with reference to FIG.

  A recess 21 for sliding member injection is formed in the shroud portion 16 of the compressor housing 6. A protrusion 22 is formed on the surface of the recess 21. The protrusion 22 may be continuous over the entire circumference, or may be provided intermittently at a required interval, or may be a protrusion protruding at a required pitch.

  In the figure, reference numeral 25 denotes a mold, which has the same outer shape as the compressor wheel 9. The molding die 25 can be fitted into the compressor housing 6 from the side opposite to the inlet 13, and the molding die 25 except for the concave portion 21 part, the inlet wall 26 that is continuous with the shroud portion 16 of the compressor housing 6. And the diffuser part wall surface 27 continuous to the shroud part 16 can be in close contact with each other.

  A resin insertion hole 28 is formed so as to open on the surface of the mold 25 that is adjacent to the shroud portion 16, and an air vent hole 29 is formed at a position facing the resin insertion hole 28.

  The case where the sliding member 20 is injection-molded on the shroud portion 16 will be described.

  The mold 25 is fitted into the compressor housing 6. By fitting the mold 25 and the inlet wall surface 26, the recess 21 becomes a resin-filled space that is liquid-tightly closed.

  A molten resin is injected from the resin insertion hole 28. The resin is injected until the recess 21 is filled with the resin and the resin leaks from the air vent hole 29. As the injected resin, a material that is soft and does not damage the compressor wheel 9 even when the compressor wheel 9 contacts, for example, a thermoplastic polyimide resin is used.

  When the resin is cured, the mold 25 is removed. Thereafter, resin burrs and the like are removed.

  The outer shape of the mold 25 is slightly larger than the outer size of the compressor wheel 9. After the sliding member 20 is formed in the recess 21, the compressor wheel 9 is formed in the compressor housing 6. In a state in which is installed, a slight gap is formed between the compressor wheel 9 and the sliding member 20.

  The sliding member 20 can be accurately molded into the shroud portion 16 by managing the accuracy of the molding die 25. Further, since the sliding member 20 is injection-molded, the degree of adhesion between the sliding member 20 and the recess 21 is high, and after the sliding member 20 is formed, the protrusion 22 is prevented from being removed.

4, a second embodiment will be described with reference to FIG.

In embodiments the second is obtained by providing a resin insertion hole 28 for the injection of resin into the recess 21, the air vent hole 29 to the compressor housing 6.

Even this embodiment, by fitting the mold 25 in the compressor housing 6, the recess 21 is space for a resin-filled closed off in a liquid-tight manner.

  A molten resin is injected from the resin insertion hole 28. The resin is injected until the recess 21 is filled with the resin and the resin leaks from the air vent hole 29. When the resin is cured, the mold 25 is removed, and the sliding member 20 is provided on the shroud portion 16.

In the case of this embodiment, the resin insertion hole 28, the air vent of the cross-sectional shape is changed in the hole 29, for example, resin injection port 28a of the resin insertion hole 28 as in FIG. 6, the air vent holes 29 outlet By forming an equal-diameter portion that increases the diameter of 29a, the resin that fills the resin insertion hole 28 and the air vent hole 29 functions as a fixing portion of the sliding member 20, so that it is formed in the recess 21. It is also possible to omit the protrusion 22.

7, a third embodiment will be described with reference to FIG.

In the injection process of embodiment the resin the third, the manner the direction of the resin flow unchanged, thereby improving the quality and the properties of the resin after molding constant.

  A concave portion 21 for injecting a sliding member is formed in the shroud portion 16 of the compressor housing 6, and a groove portion 23 is formed at a required portion of the concave portion 21 (the leading end of the concave portion in the drawing). By forming the groove portion 23, a locally large diameter portion is formed in the concave portion 21.

  In the figure, reference numerals 31 and 32 denote molding dies, which are adapted to be fitted to the compressor housing 6 from the side opposite to the intake port 13 (left side in FIG. 8). The resin insertion hole 28 has a similar outer shape, and a resin insertion hole 28 is formed in the center. The resin insertion hole 28 is a tapered hole whose diameter decreases toward the compressor housing 6. Except for the concave portion 21, the molding die 31 can be in close contact with the inlet wall surface 26 continuing to the shroud portion 16 and the diffuser portion wall surface 27 continuing to the shroud portion 16 of the compressor housing 6. By fitting the molding die 31 into the compressor housing 6, the recess 21 becomes a space for resin filling.

  The mold 32 is fitted into the air inlet 13 from the side of the air inlet 13, the mold 32 has a flange portion 32 a, has a bowl-shaped cross section, and is fitted into the air inlet 13. In this case, the front end portion is in liquid-tight contact with the inner wall of the intake port 13, and the flange portion 32 a comes into contact with the inlet end of the intake port 13 so that the front end surface 32 b is positioned.

  Thus, as shown in FIG. 8, when the molding die 31 and the molding die 32 are fitted into the compressor housing 6, a slight gap is formed between the tip surface 31a and the tip surface 32b of the molding die 31, respectively. Is formed, and a disc-shaped gap 33 is formed, and the gap 33 communicates with the recess 21 over the entire circumference. The resin insertion hole 28 communicates with the center of the gap 33. In addition, a slight gap is formed between the mold 31 and the diffuser wall 27 so that air flows but resin does not flow.

  A molten resin is injected from the resin insertion hole 28. The resin reaching the gap 33 spreads radially from the center of the gap 33 toward the outer periphery, and fills the recess 21. Corresponding to the filling of the resin, the air is discharged into the pressurizing chamber 15 through a slight gap between the mold 31 and the diffuser wall 27.

  When the resin is cured, the mold 31 and the mold 32 are removed. Thereafter, resin burrs and the like are removed.

  The resin cured in the concave portion 21 becomes the sliding member 20, and the sliding member 20 has a locally thicker diameter due to the groove portion 23, and the sliding member 20 does not come off the compressor housing 6.

In the third embodiment, the flow of the injection to the resin, the are from the center of the gap 33 becomes uniform flow radial direction toward the pressurization chamber 15, resin filled in the concave portion 21 is homogeneous Thus, there is no partial change in characteristics.

In particular, the resin usually has directionality, and the linear expansion coefficient differs between the flow direction of the resin during molding and the direction perpendicular to the flow direction. The resin used in this example also has directionality, but since the flow direction of the resin at the time of molding is uniform, the shape when the resin filled in the concave portion 21 is solidified is further stabilized. When the sliding member 20 is heated and cooled, it expands and contracts while maintaining a perfect circle.

  Furthermore, by mechanically forming the sliding member 20, mechanical properties such as tensile elongation and bending strength can be improved.

In a third embodiment, the resin insertion hole 28 provided in the mold 31, is without saying that may be provided on the mold 32.

In the above embodiment, a case in which the present invention to the turbocharger, various members having the resin in a part of the member, for example, implemented in the molding of a resin or the like for lubrication provided on the bearing member It goes without saying that it is possible.

DESCRIPTION OF SYMBOLS 1 Turbine part 2 Bearing part 3 Compressor part 4 Bearing housing 5 Turbine housing 6 Compressor housing 7 Rotating shaft 9 Compressor wheel 16 Shroud part 20 Sliding member 21 Recessed part 22 Projection 25 Mold 28 Resin insertion hole 29 Air vent hole 31 Mold 32 Mold 33 Gap

Claims (4)

A recess for injection of a sliding member is formed in the shroud portion of the compressor housing, and a protrusion or groove for retaining is formed in the recess in the circumferential direction, and the recess is closed by closely contacting the molding die to the shroud portion. Forming a space
The compressor housing is provided with a resin insertion hole that opens into the space, and from the resin insertion hole
A method of manufacturing a supercharger, wherein a resin is injected into the space, the recess is filled, and a sliding member is injection-molded in the shroud portion so as to form a part of the compressor housing. Forming a recess for sliding member injection in the shroud part of the compressor housing and forming a protrusion or groove for retaining in the recess in the circumferential direction;
A molding die is fitted from both sides of the compressor housing, a space in which the concave portion is closed is formed by one molding die, a gap is formed between the two molding dies, and the gap and the closed space are entirely formed. Communicating over the circumference, injecting resin into the center of the gap, filling the space with resin in a uniform radial flow ,
A method of manufacturing a supercharger, wherein a sliding member is injection-molded in the shroud portion so as to form a part of the compressor housing . A recess for injection of a sliding member is formed in the shroud portion of the compressor housing, and a protrusion or groove for retaining is formed in the recess in the circumferential direction, and the recess is closed by closely contacting the molding die to the shroud portion. Forming a space
The compressor housing is provided with a resin insertion hole that opens into the space, and from the resin insertion hole
The resin was injected into the space, filling the recess, the member sliding on the shroud portion as forming a part of the compressor housing by injection molding, molded sliding member is retaining by the ridges or grooves A turbocharger characterized by that. Forming a recess for sliding member injection in the shroud part of the compressor housing and forming a protrusion or groove for retaining in the recess in the circumferential direction;
A molding die is fitted from both sides of the compressor housing, a space in which the concave portion is closed is formed by one molding die, a gap is formed between the two molding dies, and the gap and the closed space are entirely formed. Communicating over the circumference, injecting resin into the center of the gap, filling the space with resin in a uniform radial flow,
A supercharger, wherein a sliding member is injection-molded in the shroud portion so as to form a part of the compressor housing, and the formed sliding member is retained by the protrusion or groove.

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