JP2004324569A - Supercharger and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To carry out accurate dimensional control and improve compression efficiency of a compressor part as well as productivity in manufacturing a supercharger. <P>SOLUTION: A recessed part 26 is formed on a shroud part 16 of a compressor housing 6. A sliding member 20 is fitted into the recessed part so as to form a space between the shroud part and the sliding member. The sliding member is fixed to the shroud part by pouring a resin into the space. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a supercharger for increasing the supply pressure of an internal combustion engine to increase the output of the engine and a method for manufacturing the same, and to improve the compression efficiency and the productivity.
[0002]
[Prior art]
Internal combustion engines used in automobiles and the like are equipped with a supercharger to improve combustion efficiency. The supercharger uses energy of exhaust gas to compress air and supply air to the internal combustion engine. Has become.
[0003]
The supercharger includes a turbine section rotated by exhaust gas and a compressor section for sucking and compressing air. The outline will be described with reference to FIG. In FIG. 4, 1 indicates a turbine unit, 2 indicates a bearing unit, and 3 indicates a compressor unit.
[0004]
A turbine housing 5 is provided at one end of the bearing housing 4, and a compressor housing 6 is provided at the other end. 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 wheel 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.
[0005]
An exhaust gas inlet 11 is provided at a required position on the circumference of the turbine housing 5, and exhaust gas of 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.
[0006]
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 a supply port of an internal combustion engine (not shown).
[0007]
High-temperature, high-pressure exhaust gas flows in from the exhaust gas inlet 11, rotates the turbine wheel 8, and is exhausted from the exhaust gas outlet 12. The rotation of the turbine wheel 8 causes the compressor wheel 9 to rotate through the rotation shaft 7, the outside air is drawn in from the intake port 13, and the outside air is compressed by the rotation of the compressor wheel 9, and the pressure of the outside air increases. Is supplied to an internal combustion engine (not shown) through the discharge port 14.
[0008]
In the compressor section 3, a boosting chamber 15 is formed around the compressor wheel 9 inside the compressor housing 6, and the outside air sucked from the intake port 13 is compressed by the rotation of the compressor wheel 9. The liquid 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 pressurizing chamber 15. The close part is the pressure boundary.
[0009]
Making the gap between the shroud part 16 and the compressor wheel 9 as small as possible can reduce the leakage at the pressure boundary and improve the compression efficiency of the compressor part 3.
[0010]
Therefore, efforts have been made to minimize the gap between the compressor wheel 9 and the shroud portion 16 during design and manufacture. On the other hand, the compressor wheel 9 is a rotating body, and may be in contact with the shroud portion 16 if it is eccentric. Further, displacement due to thermal expansion due to heat conduction from the turbine unit 1 side is also considered, and when the gap is reduced, the compressor wheel 9 and the shroud unit 16 may come into contact with each other. As described above, the compressor wheel 9 is made of aluminum, and if there is contact between the compressor wheel 9 and the shroud portion 16, the compressor wheel 9 will be damaged.
[0011]
For this reason, as shown in Patent Literature 1, a soft sliding member is provided in a portion of the shroud portion 16 which may come into contact with the compressor wheel 9, and the sliding member and the compressor wheel 9 come into contact with each other. Even so, the sliding member is cut or deformed so that the compressor wheel 9 is not damaged.
[0012]
In Patent Document 1, when the sliding member 17 is attached to the shroud portion 16 as shown in FIG. 5, a groove 18 is formed in the shroud portion 16, and an expandable / contractible C ring 19 is fitted into the groove 18. The sliding member 17 is fixed to the shroud portion 16 via the C ring 19.
[0013]
[Patent Document 1]
JP-A-11-173153
[Problems to be solved by the invention]
In Patent Document 1, the sliding member 17 and the shroud portion 16 are fixed by the C ring 19, and the number of components is increased. Also, in the assembly process, the C ring 19 is fitted on the sliding member 17 in advance, and the sliding member 17 is fitted on the shroud portion 16 while narrowing the C ring 19, so that manual work is required, In addition, there is a problem that workability is poor.
[0015]
The present invention has been made in view of such circumstances, and provides a supercharger capable of performing high-precision dimension management, improving the compression efficiency of a compressor unit, and also having high productivity.
[0016]
[Means for Solving the Problems]
According to the present invention, a recess is formed in a shroud portion of a compressor housing, a sliding member is fitted into the recess so that a space is formed between the shroud portion and the sliding member, and a resin is injected into the space. The present invention relates to a method for manufacturing a supercharger for fixing a sliding member to the shroud portion.
[0017]
The present invention also provides a concave portion formed in a shroud portion of a compressor housing, a sliding member fitted in the concave portion, a space formed between the sliding member and the shroud portion, and injection solidification into the space. And a resin for fixing the sliding member to the shroud portion. The turbocharger further includes a resin insertion hole and an air vent hole that communicate with the space in the compressor housing. It is related to.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0019]
FIG. 1 schematically shows a supercharger in which the present invention is carried out. In FIG. 1, the same components as those shown in FIG. 4 are denoted by the same reference numerals. In FIG. 1, only the compressor section 3 is broken.
[0020]
A sliding member 20 as a molded product is fitted to the shroud portion 16 of the compressor housing 6. When the sliding member 20 is fitted, an annular space 21 is formed between the compressor housing 6 and the sliding member 20.
[0021]
A resin insertion hole 22 is provided in the compressor housing 6 at a boundary between the intake port 13 and the pressure increasing chamber 15. The resin insertion hole 22 penetrates the boundary in the axial direction of the intake port 13, and The insertion hole 22 opens into the space 21. An air vent hole 23 is provided at a position 180 ° with respect to the resin insertion hole 22 in the same manner as the resin insertion hole 22, and the air vent hole 23 opens into the space 21.
[0022]
The space 21 is filled with the resin 24 melted from the resin insertion hole 22 and solidified. When the resin 24 is solidified, the resin 24 functions as a fixing ring provided between the shroud portion 16 and the sliding member 20, and the sliding member 20 is fixed to the shroud portion 16.
[0023]
This will be further described with reference to FIGS.
[0024]
A concave portion 26 is formed in the shroud portion 16, and a small concave portion 26a is further formed in the concave portion 26. The resin insertion hole 22 and the air vent hole 23 are opened in the concave portion 26.
[0025]
The sliding member 20 is made of a material that is soft and does not damage the compressor wheel 9 even when the compressor wheel 9 contacts. Examples of the material include a resin such as a fluororesin (polytetrafluoroethylene (CF2CF2) n) or a resin such as PPS (polyphenylene sulfide [C6H5S] x). Preferably, a fluororesin-based resin is used.
[0026]
The sliding member 20 has a fitting surface 27, on which a small recess 27a is formed. The fitting surface 27 is fitted into the concave portion 26, and the small concave portion 27a forms the annular space 21 with the small concave portion 26a.
[0027]
With the sliding member 20 fitted, molten resin is injected from the resin insertion hole 22. The resin is injected until it leaks from the air vent hole 23, and solidifies after a predetermined time has elapsed after the injection. As the resin to be injected, for example, a thermoplastic nylon resin is used.
[0028]
The resin 24 solidifies to form a continuous ring at the boundary between the shroud portion 16 and the sliding member 20, and the ring restrains relative displacement between the sliding member 20 and the shroud portion 16, The sliding member 20 is fixed to the shroud section 16.
[0029]
The step of fixing the sliding member 20 to the shroud portion 16 can be mechanized, the number of parts is reduced, manual work can be omitted, and workability is improved.
[0030]
In the above-described embodiment, the case where the present invention is applied to a supercharger has been described. However, it goes without saying that the present invention can be applied to a case where another component is attached to a component.
[0031]
【The invention's effect】
As described above, according to the present invention, a concave portion is formed in the shroud portion of the compressor housing, and a sliding member is fitted into the concave portion so that a space is formed between the shroud portion and the sliding member. Since the sliding member is fixed to the shroud portion by injecting a resin, the number of parts is small and manual work can be omitted, so that excellent effects such as improvement in productivity can be exhibited.
[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.
FIG. 2 is an explanatory diagram showing an embodiment of the present invention.
FIG. 3 is a cross-sectional view showing the first embodiment.
FIG. 4 is a schematic view of a supercharger.
FIG. 5 is a sectional view showing a conventional example.
[Explanation of symbols]
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 Space 22 Resin insertion hole 23 Air vent hole 24 Resin 26 Recess 26 a Small recess 27 fit Joint surface 27a Small recess

Claims (3)

A recess is formed in the shroud portion of the compressor housing, a sliding member is fitted into the recess so that a space is formed between the shroud portion and the sliding member, and a resin is injected into the space so that the sliding member is formed. A method for manufacturing a turbocharger, comprising: fixing a turbocharger to a shroud portion. A concave portion formed in the shroud portion of the compressor housing, a sliding member fitted in the concave portion, a space formed between the sliding member and the shroud portion, and the sliding member injected and solidified into the space and A supercharger comprising: a resin fixed to a shroud portion. The supercharger according to claim 2, wherein a resin insertion hole and an air vent hole communicating with the space are penetrated through the compressor housing.

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