JP2008274904A - Mounting structure for turbocharger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide technology allowing easily attaching an exhaust gas intake port of the turbocharger to an internal combustion engine, in a mounting structure for the turbocharger. <P>SOLUTION: This structure is provided with a pedestal part 3 including a claw part 3a of which tip is oriented upward at a lower end part and a flange part 4 fixed on the pedestal part 3 under a condition where lower tip of the claw part 3a is inserted and a gap with the pedestal part 3 is sealed. The claw part 3a includes an inclined surface 3b at an inside of a tip butting on the flange part 4, and the flange part 4 includes an inclined surface 4a at a section butting on the inclined surface 3b. The flange part 4 is fixed on the pedestal part 3 by fastening of a bolt 6 roughly horizontally inserted in an internal combustion engine from the flange part 4 via the pedestal part 3 at an upper side of the intake port and by fastening of a bolt 7 inserted from a lower part to an upper part in the flange part 4 from a lowermost part of the claw part 3a of the pedestal part 3 at a lower part of the intake port where an exhaust gas flow part 5 extending from the intake port of the turbocharger covers a surface thereof. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a turbocharger mounting structure for mounting an exhaust intake port of a turbocharger to an internal combustion engine.

With regard to a fixing device for fixing a turbocharger, the fixing device has first and second legs that can be fixed to a lower foundation, and both the first and second legs are separated in the axial direction. The second leg portion has a casing coupling area that can be coupled to the turbocharger and a lower foundation coupling area that can be coupled to the lower foundation. The casing coupling area is formed in the form of a partial arc or arc, and the axial reinforcing member couples the casing coupling area and the lower foundation coupling area and ranges from 0 ° to 60 ° with the lower foundation. The technique which makes the inside angle is known (refer patent document 1).
Special table 2005-516143 gazette JP-A-6-17660

  By the way, in recent years, in an exhaust system for passing exhaust gas exhausted from an internal combustion engine, the exhaust passage from the internal combustion engine to the catalyst tends to be shortened from the viewpoint of catalyst warm-up and the like. In particular, in an internal combustion engine equipped with a turbocharger, a structure has been proposed in which the turbocharger is directly attached to the internal combustion engine without using an exhaust passage between the internal combustion engine and the turbocharger. When the turbocharger is directly attached to the internal combustion engine, the flange portion extending on the outer periphery of the exhaust port of the turbocharger is coupled with a bolt that is inserted substantially horizontally into the side wall of the internal combustion engine.

  Here, when the turbocharger is directly attached to the internal combustion engine, since the exhaust outlet of the internal combustion engine is directly connected to the exhaust intake of the turbocharger, the exhaust intake of the turbocharger becomes large. Thus, when the intake port of the exhaust gas of the turbocharger becomes large, it is necessary to increase the number of bolts required for coupling in order to secure the tightening surface pressure. At this time, since the flange portion extending on the outer periphery of the exhaust intake port of the turbocharger is hidden by the exhaust circulation portion of the turbocharger extending from the flange portion, a part of the coupling portions by the plurality of bolts is inserted substantially horizontally. It was difficult to connect with bolts.

  An object of the present invention is to provide a technology for easily mounting an exhaust intake port of a turbocharger to an internal combustion engine in a turbocharger mounting structure.

In the present invention, the following configuration is adopted. That is,
A turbocharger mounting structure for mounting an exhaust intake port of a turbocharger that takes in exhaust gas discharged from an internal combustion engine and supercharges intake air using the energy of the captured exhaust gas to the internal combustion engine,
A pedestal portion provided on a side surface of the internal combustion engine and having a claw portion with a tip facing upward at a lower end portion;
A flange portion formed around an exhaust intake port of the turbocharger, wherein the flange portion is fixed to the pedestal portion in a state where a lower end is inserted into the claw portion and the space between the pedestal portion is sealed. And
With
The claw portion has a gradient in which the gap in the claw portion is narrower in the lower part and wider in the upper part on the inner side of the front end in contact with the flange part. In the part that abuts on the inside, the lower part of the flange part is slender, and the upper part has a gradient that becomes thick,
Fixing the flange to the pedestal,
On the upper side of the intake port, it is fixed by a fixing means that is inserted substantially horizontally into the internal combustion engine from the flange portion through the pedestal portion,
Fixing means that is inserted from the bottom of the claw portion of the pedestal portion into the flange portion from below to the flange portion on the lower side of the intake port where the exhaust circulation portion extending from the intake port of the turbocharger covers the surface The turbocharger mounting structure is characterized by being fixed.

  According to this, on the upper side of the intake port in which the fixing means can be inserted and fixed substantially horizontally, the fixing means is inserted and fixed to the internal combustion engine substantially horizontally via the base portion from the flange portion. In addition, since the exhaust circulation part extending from the intake port of the turbocharger covers the surface, the flange part extends from the lowest part of the claw part of the pedestal part below the intake part that cannot be fixed by inserting the fixing means substantially horizontally. Insert the fixing means from the bottom to the top and fix it. For this reason, the exhaust intake port of the turbocharger can be easily attached to the internal combustion engine.

  Here, by tightening the fixing means on the lower side of the intake port, the sloped surface of the flange portion slides on the sloped surface of the claw portion that comes into contact, and the flange portion is on the pedestal side. The gap between the flange portion and the pedestal portion can be suitably sealed.

  It is preferable to interpose a metal member having a high thermal expansion coefficient while the inclined surfaces of both the claw portion and the flange portion abut.

  According to this, when the internal combustion engine and the turbocharger are operated and become high temperature, the metal member having a high thermal expansion coefficient expands and tries to spread between the claw portion and the flange portion. It is pushed up in the direction of the perpendicular to the surface. Here, since the horizontal component of the force pushed up in the perpendicular direction becomes a force for pressing the flange portion against the pedestal portion, the gap between the flange portion and the pedestal portion can be more suitably sealed.

  It is preferable to interpose a metal member having spring characteristics while the inclined surfaces of both the claw portion and the flange portion abut.

  According to this, the metal member having a spring characteristic is repelled after the attachment, tries to spread between the claw portion and the flange portion, and the flange portion is pushed up in a direction perpendicular to the surface having the gradient. Here, since the horizontal component of the force pushed up in the perpendicular direction becomes a force for pressing the flange portion against the pedestal portion, the gap between the flange portion and the pedestal portion can be more suitably sealed.

  According to the present invention, in the turbocharger mounting structure, the exhaust port of the turbocharger can be easily mounted on the internal combustion engine.

  Specific examples of the present invention will be described below.

<Example 1>
FIG. 1 is a side view showing a state in which a turbocharger 1 according to this embodiment is attached to an internal combustion engine 2. As shown in FIG. 1, when the turbocharger 1 that takes in the exhaust discharged from the internal combustion engine 2 and supercharges the intake air using the energy of the taken-in exhaust is directly attached to the internal combustion engine 2, the internal combustion engine 2 Is directly connected to the exhaust intake port of the turbocharger 1.

  In this case, conventionally, the flange portion 4 extending on the outer periphery of the exhaust intake port of the turbocharger 1 is coupled to the pedestal portion 3 provided on the side wall of the internal combustion engine with a bolt that is inserted substantially horizontally.

  Here, when the turbocharger 1 is directly attached to the internal combustion engine 2, since the exhaust outlet of the internal combustion engine 2 is directly connected to the exhaust intake of the turbocharger 1, the exhaust intake of the turbocharger 1 becomes large. . Thus, when the exhaust intake port of the turbocharger 1 becomes large, it is necessary to increase the number of bolts required for coupling in order to secure the tightening surface pressure. At this time, on the lower side of the intake port of the turbocharger 1, the flange portion 4 extending on the outer periphery of the exhaust intake port of the turbocharger 1 is hidden by the exhaust circulation portion 5 of the turbocharger 1 extending from the flange portion 4. For this reason, it is difficult to connect the bolts by inserting them substantially horizontally.

  Therefore, in the present embodiment, the lower side of the intake port of the turbocharger 1 is connected to the flange portion 4 from the pedestal portion 3 by the bolt 7 inserted from the bottom up.

  The mounting structure of the present embodiment includes a pedestal portion 3 provided on a side surface of the internal combustion engine 2 and a flange portion 4 formed around an exhaust intake port of the turbocharger 1.

  The pedestal portion 3 has a claw portion 3a with the tip directed upward at the lower end portion, and the flange portion 4 is a pedestal portion in a state where the lower end is inserted into the claw portion 3a and the space between the pedestal portion 3 is sealed. 3 is fixed by bolts 6 and 7.

  Here, the claw portion 3a forms an inclined surface 3b with a gradient in which the gap in the claw portion 3a is narrower at the lower side and wider at the inner side of the tip extending obliquely upward in contact with the flange portion 4. . In addition, the flange portion 4 is formed with an inclined surface 4a having a gradient such that the lower portion of the flange portion 4 is thin and the upper portion is thicker at a portion in contact with the inside of the tip of the claw portion 3a having the inclined surface 3b. is doing.

  In this embodiment, the flange portion 4 that spreads around the outer periphery of the exhaust intake port of the turbocharger 1 to the pedestal portion 3 provided on the side wall of the internal combustion engine is fixed from the flange portion 4 above the intake port. Below the intake port where the exhaust circulation part 5 extending from the intake port of the turbocharger 1 is coupled with a bolt 6 as a fixing means that is inserted substantially horizontally into the internal combustion engine 2 via the pedestal part 3 and covers the surface. The bottom 7 of the claw claw 3a of the pedestal 3 is coupled to the flange 4 with bolts 7 inserted from the bottom up.

  According to this configuration, on the upper side of the intake port where the bolt 6 can be inserted and connected substantially horizontally, the bolt 6 is inserted and connected to the internal combustion engine 2 from the flange portion 4 via the pedestal portion 3. In addition, since the exhaust circulation part 5 extending from the intake port of the turbocharger 1 covers the surface, the lowermost part of the claw part 3a of the pedestal part 3 is located below the intake port where the bolts cannot be connected by being inserted substantially horizontally. The bolts 7 are inserted into the flange portion 4 from the bottom to the top and coupled. Therefore, the exhaust intake port of the turbocharger 1 can be easily attached to the internal combustion engine 2.

  Here, by tightening the bolt 7 on the lower side of the intake port, the inclined surface 4a having the gradient of the flange portion 4 slides on the inclined surface 3b having the gradient of the claw portion 3a to be contacted, The flange part 4 is pressed against the pedestal part 3 side as it is tightened, so that it can be suitably sealed between the flange part 4 and the pedestal part 3, particularly in the lower part.

  Further, in the present embodiment, as shown in an enlarged view in FIG. 2, the metal having a high thermal expansion coefficient is in contact with the inclined surfaces 3b, 4a having both the claw portion 3a and the flange portion 4 having a gradient. A metal plate 8 having a high coefficient of thermal expansion is interposed as a member.

  According to this configuration, when the internal combustion engine 2 and the turbocharger 1 are operated and become high temperature, the metal plate 8 having a high coefficient of thermal expansion expands and tries to push the gap between the claws 3 a and the flange 4. The flange portion 4 is pushed up in the direction perpendicular to the inclined surface 3b. Here, since the horizontal component of the force pushed up in the perpendicular direction becomes a force (F in the drawing) that presses the flange portion 4 against the pedestal portion 3, the gap between the flange portion 4 and the pedestal portion 3 can be more suitably sealed. it can.

  In the present embodiment, the metal plate 8 having a high coefficient of thermal expansion is interposed between the inclined surfaces 3b and 4a of both the claw portion 3a and the flange portion 4; You may make it interpose the metal plate 8 with a spring characteristic as a metal member with a characteristic. Also by this, after attaching the turbocharger 1 to the internal combustion engine 2, the metal having spring characteristics repels and tries to spread between the claw portion 3a and the flange portion 4, and the flange portion 4 is perpendicular to the inclined surface 3b. Pushed up. Here, since the horizontal component of the force pushed up in the perpendicular direction becomes a force for pressing the flange portion against the pedestal portion, the gap between the flange portion 4 and the pedestal portion 3 can be more suitably sealed. Here, the shape of the metal plate 8 having a spring characteristic is a repulsive shape such as a plate that hits a wavy line shown in FIG. 3A or a folded V-shaped plate shown in FIG. There is no particular limitation as long as it is present.

  The turbocharger mounting structure according to the present invention is not limited to the above-described embodiment, and various modifications may be made without departing from the scope of the present invention.

1 is a side view showing a state in which a turbocharger according to Embodiment 1 is attached to an internal combustion engine. It is a figure which expands and shows the attachment structure concerning Example 1. FIG. 3A is a perspective view showing a plate that strikes a wavy line, and FIG. 3B shows a folded V-shaped plate. It is a perspective view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Turbocharger 2 Internal combustion engine 3 Base part 3a Claw part 3b Inclined surface 4 Flange part 4a Inclined surface 5 Exhaust flow part 6, 7 Bolt 8 Metal plate

Claims (3)

A turbocharger mounting structure for mounting an exhaust intake port of a turbocharger that takes in exhaust gas discharged from an internal combustion engine and supercharges intake air using the energy of the captured exhaust gas to the internal combustion engine,
A pedestal portion provided on a side surface of the internal combustion engine and having a claw portion with a tip facing upward at a lower end portion;
A flange portion formed around an exhaust intake port of the turbocharger, wherein the flange portion is fixed to the pedestal portion in a state where a lower end is inserted into the claw portion and the space between the pedestal portion is sealed. And
With
The claw portion has a gradient in which the gap in the claw portion is narrower in the lower part and wider in the upper part on the inner side of the front end in contact with the flange part. In the part that abuts on the inside, the lower part of the flange part is slender, and the upper part has a gradient that becomes thick,
Fixing the flange to the pedestal,
On the upper side of the intake port, it is fixed by a fixing means that is inserted substantially horizontally into the internal combustion engine from the flange portion through the pedestal portion,
Fixing means that is inserted from the bottom of the claw portion of the pedestal portion into the flange portion from below to the flange portion on the lower side of the intake port where the exhaust circulation portion extending from the intake port of the turbocharger covers the surface Turbocharger mounting structure characterized by being fixed.   The turbocharger mounting structure according to claim 1, wherein a metal member having a high coefficient of thermal expansion is interposed between the surfaces of the claws and the flange that are inclined. .   The turbocharger mounting structure according to claim 1, wherein a metal member having a spring characteristic is interposed between surfaces of the claw portions and the flange portions having a slope.

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