JP2013189921A - Supercharger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance rigidity in a joint portion of an exhaust manifold and a turbine housing in a configuration including the exhaust manifold and the turbine housing integrally molded with the exhaust manifold.SOLUTION: A supercharger 1 driven by an exhaust gas of an engine and enhancing a supercharging pressure of the engine includes: an exhaust manifold 16 into which the exhaust gas is guided; a turbine housing 4 that is integrally molded with the exhaust manifold and where an annular turbine scroll flow path into which the exhaust gas flows from the exhaust manifold and an ejection port that discharges fluid guided from the turbine scroll flow path are formed; and rib 17 that continuously extends to the exhaust manifold from a large-diameter part 4b having the largest circumferential length of the turbine housing in the outer wall of the turbine housing segmenting and defining the turbine scroll flow path.

Description

  The present invention relates to a supercharger including a turbine housing formed integrally with an exhaust manifold.

  Conventionally, a turbocharger, for example, connects an exhaust manifold of an engine to a turbine housing that houses a turbine impeller, guides exhaust gas, rotates the turbine impeller, compresses air with the rotational force, and sends the compressed air to the engine. Therefore, it is used to increase engine output. In automobiles equipped with this turbocharger and engine, it is required to reduce the size of the engine compartment, reduce the number of parts, and reduce the weight of the vehicle body. To meet these requirements, the turbine housing and exhaust manifold are integrally molded. A configuration has been proposed.

  By integrally molding the turbine housing and the exhaust manifold, it is not necessary to fasten both of them, and parts such as a flange and bolts for fastening are unnecessary, and the size and weight can be reduced. For example, Patent Document 1 describes an exhaust manifold in which a turbine housing is integrated by casting. The exhaust manifold forms an exhaust flow path of a multi-cylinder engine, and has a collecting portion where a plurality of flow paths corresponding to the cylinders merge together. Ribs are provided along the direction in which the plurality of flow paths merge in the outer wall portion that forms the upstream portion of the collective portion and the collective portion, and the rigidity of the outer wall portion is enhanced.

JP 2000-199427 A

  By the way, when the turbine housing and the exhaust manifold are integrally formed, the continuous portion from the exhaust manifold gathering portion to the portion forming the turbine scroll flow path becomes the highest temperature and the portion having the strongest thermal deformation force due to thermal expansion.

  Here, when the turbine housing and the exhaust manifold are fastened with a flange structure, the thermal deformation force in the direction perpendicular to the flow path between the turbine housing and the exhaust manifold is released by sliding the flanges. Moreover, about the heat deformation force of the same direction as a flow path, some absorption was performed by the deformation | transformation of the gasket between flanges. However, by integrally molding the turbine housing and the exhaust manifold, there is no room for releasing and absorbing the thermal expansion in the continuous portion, and a thermal deformation force is generated. Therefore, in order to resist the thermal deformation force in the continuous part, the continuous part is required to have high rigidity.

  On the other hand, when the turbine housing and the exhaust manifold are integrally formed, the flange formed to fasten both is not necessary. Therefore, if the continuous portion where both are continuous is a simple tubular shape, the flange is formed. In comparison, the rigidity of the continuous part is lowered.

  For these reasons, when the turbine housing and the exhaust manifold are integrally formed, it is desired to improve the rigidity of the continuous portion of the turbine housing and the exhaust manifold.

  The objective of this invention is providing the supercharger which can improve the rigidity of the continuous part of an exhaust manifold and a turbine housing in the structure provided with the turbine housing integrally molded with the exhaust manifold.

  In order to solve the above-described problems, a supercharger according to the present invention is a supercharger that is driven by engine exhaust gas to increase the supply air pressure of the engine, the exhaust manifold through which the exhaust gas is guided, and the exhaust manifold And a turbine housing formed with an annular turbine scroll passage through which the exhaust gas flows from the exhaust manifold, and a discharge port through which the fluid introduced from the turbine scroll passage is led out, and the turbine scroll Of the outer wall portion of the turbine housing that defines the flow path, a rib that continuously extends from the large-diameter portion having the largest peripheral length of the turbine housing to the exhaust manifold is provided.

  According to the present invention, the rigidity of the continuous portion of the exhaust manifold and the turbine housing can be increased in the configuration including the turbine housing integrally formed with the exhaust manifold.

It is a schematic sectional drawing of a supercharger. It is a 1st external view of a supercharger. It is a 2nd external view of a supercharger.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

  FIG. 1 is a schematic sectional view of the supercharger 1, and FIGS. 2 and 3 are external views of the supercharger 1. 2A is a front view, FIG. 2B is a bottom view, FIG. 3A is a rear view, and FIG. 3B is a top view of the supercharger 1. In FIG. 1, the outline of the supercharger 1 is indicated by a broken line around the cross-sectional view.

  Hereinafter, the direction of arrow F shown in FIG. 1 will be described as the front side of the supercharger 1, and the direction of arrow R will be described as the rear side of the supercharger 1. As shown in FIGS. 1 to 3, the supercharger 1 is connected to a bearing housing 2, a turbine housing 4 connected to the front side of the bearing housing 2 by a fastening mechanism 3, and a bolt 5 to the rear side of the bearing housing 2. The compressor housing 6 is integrally formed.

  As shown in FIG. 1, a groove 2 a that is recessed in the radial direction of the bearing housing 2 is provided on the outer peripheral surface of the bearing housing 2 in the vicinity of the turbine housing 4. A groove 4 a that is recessed in the radial direction of the turbine housing 4 is provided on the outer peripheral surface of the turbine housing 4 in the vicinity of the bearing housing 2. The bearing housing 2 and the turbine housing 4 are fixed by fastening the bands 2 a and 4 a by the fastening mechanism 3.

  As shown in FIGS. 2 and 3, the fastening mechanism 3 includes semi-circular bands 3a and 3b, a connecting ring 3c, a bolt 3d, and a nut 3e. The semicircular bands 3a and 3b are members that cover the half circumferences of the outer peripheral surfaces in the vicinity of the ends of the bearing housing 2 and the turbine housing 4, and, as shown in FIG. 1, two projecting portions 3f that project radially inward are provided. Have. The protruding portion 3f is fitted in the grooves 2a and 4a, and one ends of both the semicircular bands 3a and 3b are hooked to the connecting ring 3c. A flange 3g is formed at the other end of both the semicircular bands 3a and 3b, and is fastened by a bolt 3d and a nut 3e.

  As shown in FIG. 1, the bearing housing 2 is formed with a bearing hole 2 b penetrating in the front-rear direction of the turbocharger 1, and the turbine shaft 7 is rotatably supported via the bearing B in the bearing hole 2 b. Has been. A turbine impeller 8 is integrally connected to a front end portion of the turbine shaft 7, and the turbine impeller 8 is rotatably accommodated in the turbine housing 4. A compressor impeller 9 is integrally connected to the rear end (other end) of the turbine shaft 7, and the compressor impeller 9 is rotatably accommodated in the compressor housing 6.

  The compressor housing 6 is formed with an air inlet 10 that opens to the rear side of the supercharger 1 and is connected to an air cleaner (not shown). Further, in a state where the bearing housing 2 and the compressor housing 6 are connected by the bolt 5, a diffuser flow path 11 that compresses and pressurizes air is formed by the facing surfaces of both the housings 2 and 6. The diffuser passage 11 is formed in an annular shape from the radially inner side to the outer side of the turbine shaft 7 (compressor impeller 9), and communicates with the intake port 10 via the compressor impeller 9 on the radially inner side. ing.

  Further, the compressor housing 6 is provided with an annular compressor scroll passage 12 positioned on the radially outer side of the turbine shaft 7 (compressor impeller 9) with respect to the diffuser passage 11. The compressor scroll passage 12 communicates with the intake port of the engine and also communicates with the diffuser passage 11. Therefore, when the compressor impeller 9 rotates, fluid is sucked into the compressor housing 6 from the intake port 10, and the sucked fluid is boosted in the diffuser flow path 11 and the compressor scroll flow path 12 to be sucked into the engine intake port. Will be led to.

  The turbine housing 4 is formed with a discharge port 13 that opens to the front side of the supercharger 1 and is connected to an exhaust gas purification device (not shown). Further, the turbine housing 4 is provided with a flow path 14 and an annular turbine scroll flow path 15 positioned on the radially outer side of the turbine shaft 7 (turbine impeller 8) with respect to the flow path 14. The turbine scroll passage 15 communicates with a passage in the exhaust manifold 16 through which engine exhaust gas is guided, and also communicates with the passage 14 described above.

  The exhaust manifold 16 includes, for example, exhaust gas inflow holes 16a to 16d guided from four cylinders of the engine shown in FIG. 3A, and the inflow holes 16a to 16a shown in FIGS. A collecting portion 16e where the exhaust gas flowing in from 16d merges.

  Therefore, the exhaust gas of the engine guided from the flow path in the exhaust manifold 16 to the turbine scroll flow path 15 is guided to the discharge port 13 via the flow path 14 and the turbine impeller 8, and the turbine impeller 8 is in the flow process. Will be rotated. Then, the rotational force of the turbine impeller 8 is transmitted to the compressor impeller 9 via the turbine shaft 7, and the fluid is boosted by the rotational force of the compressor impeller 9 as described above, and the intake port of the engine Will be led to. Thus, the supercharger 1 is driven by the exhaust gas of the engine and increases the supply air pressure of the engine.

  By the way, as shown in FIGS. 2 and 3, the turbine housing 4 of the supercharger 1 of the present embodiment is integrally formed with the exhaust manifold 16 of the engine, for example, by casting.

  Since the exhaust manifold 16 is hotter than the turbine housing 4 and is greatly deformed by thermal expansion, when the turbine housing 4 and the exhaust manifold 16 are integrally molded, a load due to thermal expansion is applied to a portion where the turbine housing 4 and the exhaust manifold 16 are continuous. Take it.

  In addition, compared to the fastening portion when the turbine housing 4 and the exhaust manifold 16 are fastened with a flange structure, the outer wall portion of the portion where the turbine housing 4 and the exhaust manifold 16 are continuous has no flange and has low rigidity. Since relative displacement between the turbine housing 4 and the exhaust manifold 16 is not allowed, the shear stress is likely to increase.

  Therefore, in the supercharger 1 of the present embodiment, the exhaust gas is provided in a portion where the turbine housing 4 and the exhaust manifold 16 are continuous (a continuous portion 16f indicated by a one-dot chain line in FIG. 2A and FIG. 3A). A rib 17 protruding in the thickness direction is provided on the outer surface in the thickness direction of the outer wall portion forming the channel along the channel direction.

  Here, the continuous portion 16f is, for example, on the outer wall portion of the exhaust manifold 16 that is downstream of the collecting portion 16e and that is upstream of the turbine scroll flow passage 15 of the turbine housing 4. The outer surface in the thickness direction.

  More specifically, in the exhaust manifold 16, the collective portion 16e extends in parallel with the axial direction of the turbine shaft 7, and the continuous portion 16f is orthogonal to the collective portion 16e.

  In the continuous portion 16f, a flow path for guiding the exhaust gas guided to the collecting portion 16e to the turbine scroll flow path 15 from the outside in the radial direction of the turbine scroll flow path 15 is formed. Accordingly, the continuous portion 16 f is located on the outer periphery of the turbine scroll passage 15 in the radial direction of the turbine scroll passage 15 in the turbine housing 4.

  In addition, the continuous portion 16f includes an annular outer wall portion on the outer peripheral side that forms the turbine scroll passage 15 in the turbine housing 4 and a linear passage that is continuous with the upstream side of the turbine scroll passage 15. The boundary part (continuous part) of the cylindrical outer wall part to be formed is included.

  In the present embodiment, among the outer wall portions of the turbine housing 4 that define and form the turbine scroll flow path 15, the portion having the largest peripheral length of the turbine housing 4 is the large diameter portion 4 b (FIGS. 2A and 2B). 3 (a) and 3 (b)). The outer diameter portion 4 b extends over the circumferential direction on the outer periphery of the turbine housing 4. Here, the circumferential length of the turbine housing 4 is, for example, the length of the contour line of the outer shape in the circumferential direction of the turbine housing 4 (the rotational direction of the turbine shaft 7).

  The rib 17 extends from the large diameter portion 4b to the exhaust manifold 16 along the flow path direction of the continuous portion 16f.

  As described above, the supercharger 1 of the present embodiment includes the turbine housing 4 that is integrally formed with the exhaust manifold 16, and the rib 17 that extends to the continuous portion 16 f is provided outside the turbine housing 4. Therefore, the rigidity of the continuous portion 16f is increased.

  Further, the rib 17 continuously extends from the large diameter portion 4 b to the collecting portion 16 e of the exhaust manifold 16. Therefore, the rigidity of the continuous portion 16f where the load due to thermal deformation is greatest is further increased as compared with the case where the end of the rib 17 is located near the continuous portion 16f.

  Further, since the ribs 17 are provided in the large diameter portion 4b, the ribs 17 of the turbine housing 4 are compared with the case where the ribs 17 having the same height are provided in other portions on the outer periphery of the turbine scroll passage 15. In addition to increasing the volume and increasing the rigidity, the surface area of the rib 17 is also increased, and the heat dissipation effect of the turbine housing 4 is high.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to this embodiment. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Is done.

  INDUSTRIAL APPLICABILITY The present invention can be used for a supercharger including a turbine housing that is integrally formed with an exhaust manifold.

DESCRIPTION OF SYMBOLS 1 ... Supercharger 4 ... Turbine housing 4b ... Large diameter part 13 ... Discharge port 15 ... Turbine scroll flow path 16 ... Exhaust manifold 17 ... Rib

Claims (1)

A turbocharger that is driven by the exhaust gas of the engine to increase the charge pressure of the engine,
An exhaust manifold through which the exhaust gas is directed;
An annular turbine scroll passage integrally formed with the exhaust manifold, into which the exhaust gas flows from the exhaust manifold, and a turbine housing in which a discharge port for leading the fluid introduced from the turbine scroll passage is formed;
Of the outer wall portion of the turbine housing that defines the turbine scroll flow path, a rib that continuously extends from the large-diameter portion having the largest peripheral length of the turbine housing to the exhaust manifold is provided. Turbocharger.

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