JP2007315257A - Heat insulating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat insulating device capable of ensuring cooling performance around an exhaust system and effectively lowering oil temperature in an oil pan. <P>SOLUTION: This heat insulating device is provided with a shielding member 12 intercepting radiant heat radiating from the exhaust systems 5, 6 delivering exhaust gas from an engine 1 to the oil pan 7 and also introducing traveling wind W generated between the shielding member and the oil pan 7 by the traveling of a vehicle, and a communicating hole 15 formed into the shielding member 12 delivering at least a part of traveling wind W introduced by the shielding member 12 toward the exhaust system 6. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a heat shield device.

Conventionally, as this type of heat shield device, in order to prevent the engine from being exposed to the radiant heat radiated from the exhaust system, a heat shield plate attached to cover the surface of the exhaust system has been proposed.
In this device, a heat-shielding plate is provided with a duct-like duct portion, and negative air pressure is generated at the outlet of the duct portion by running wind, thereby generating an air flow from the inlet to the outlet of the duct portion, and surrounding the exhaust system. The temperature is supposed to be lowered.
JP 2005-171792 A

  By the way, an oil pan is generally attached to the lower part of the engine. In addition to shielding the radiant heat from the exhaust system in order to prevent the oil temperature in the oil pan from rising, It is important to reduce the temperature. However, since the above-described heat shield device circulates air by the negative pressure generated by the traveling wind, the temperature around the exhaust system cannot be effectively reduced, and the oil temperature in the oil pan cannot be cooled. Absent. In order to circulate the air, it may be forcibly circulated using a fan or the like, but there is a problem that not only the structure becomes complicated but also the number of parts increases.

  The present invention has been devised in view of the above-described conventional problems, and a heat shield device according to the present invention has an object of more easily ensuring the cooling performance around the exhaust system. Another object of the heat shield device of the present invention is to effectively reduce the oil temperature in the oil pan. Furthermore, the heat shield device of the present invention has one of the purposes of improving the rigidity of the oil pan, and claim 1 of the present invention blocks the radiant heat radiated to the oil pan from the exhaust system that discharges the exhaust gas of the engine. A shielding member capable of introducing a traveling wind generated by traveling of the vehicle between the pan and a communication hole formed in the shielding member for discharging at least a part of the traveling wind introduced by the shielding member toward the exhaust system It is to provide.

  A second aspect of the present invention is that the shielding member is integrally formed with the oil pan.

  According to a third aspect of the present invention, the shielding member is integrally formed in a hanging shape from an attachment flange provided on the oil pan in order to attach the oil pan to the engine body.

  According to a fourth aspect of the present invention, the shielding member includes an extending portion that extends downward from at least the bottom surface of the oil pan.

  Further, the fifth aspect of the present invention is that the shielding member is formed in a shape in which at least the extending portion can easily introduce the traveling wind.

  In addition, according to a sixth aspect of the present invention, at least the extending portion of the shielding member is bent toward the oil pan.

  A seventh aspect of the present invention is that the shielding member is connected to a rib projecting from a side wall constituting the side surface of the oil pan.

  Further, according to the eighth aspect of the present invention, the mounting flange is formed with a bolt hole for mounting the oil pan to the engine body, and the bolt hole is formed as an opening penetrating in the vertical direction. It is to become.

  A ninth aspect of the present invention is that the rib is disposed between the bolt hole and the opening.

  A tenth aspect of the present invention is that the oil pan is formed with heat radiating fins.

  The eleventh aspect is that the radiating fin is formed at a position corresponding to the opening of the side wall.

  The heat shield device of the present invention shields the radiant heat radiated to the oil pan from the exhaust system for exhausting the exhaust gas of the engine, and a shielding member capable of introducing running wind generated by vehicle running between the oil pan, By providing a communication hole formed in the shielding member that discharges at least a part of the traveling wind introduced by the shielding member toward the exhaust system, the traveling wind introduced by the shielding member is only discharged from the communication hole. Since the exhaust system is cooled in this way, the cooling performance around the exhaust system can be secured more easily. In addition, since the traveling wind is introduced between the shielding member and the oil pan, the oil temperature in the oil pan can be effectively reduced.

  Further, since the shielding member is integrally formed with the oil pan, the number of parts can be reduced as compared with a case where a separate heat shielding member is provided.

  In addition, the shielding member is integrally formed in a hanging shape from a mounting flange provided on the oil pan in order to attach the oil pan to the engine body, so that radiant heat radiated to the oil pan can be obtained. Can be blocked with a simple configuration.

  In addition, since the shielding member has at least an extending portion that extends downward from the bottom surface of the oil pan, it is possible to reliably receive the traveling wind flowing along the bottom surface of the oil pan. The traveling wind can be reliably introduced between the shielding member and the oil pan.

  In addition, since the shielding member is formed in a shape in which at least the extending portion can easily introduce the traveling wind, the traveling wind can be easily introduced between the shielding member and the oil pan.

  In addition, since at least the extending portion is bent toward the oil pan, the shielding member can easily ensure a shape that can easily introduce a traveling wind because it only bends the extending portion.

  In addition, since the shielding member is connected to a rib protruding from the side wall constituting the side surface of the oil pan, the rigidity of the mounting flange can be improved.

  The mounting flange is formed with a bolt hole for mounting the oil pan to the engine body, and the bolt hole is formed as an opening penetrating in the vertical direction. By doing so, the weight of the oil pan can be reduced. Further, the introduced traveling wind can be discharged from the opening toward the periphery of the exhaust system. As a result, the periphery of the exhaust system can be cooled more effectively, and the oil temperature in the oil pan can be effectively reduced.

  In addition, since the rib is disposed between the bolt hole and the opening, the rigidity of the mounting flange can be improved.

  Further, since the oil pan is formed with heat radiating fins, the oil temperature in the oil pan can be effectively lowered.

  In addition, since the radiating fin is formed at a position corresponding to the opening of the side wall, the oil temperature in the oil pan can be more effectively lowered.

Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram showing an outline of a configuration of an engine 1 according to an embodiment of the present invention. The engine 1 of the embodiment is connected to the cylinder block 2, the cylinder head 3 connected to the top of the cylinder block 2, the rocker cover 4 provided on the top of the cylinder head 3, and the bottom side of the cylinder block 2. An oil pan 7 for accumulating oil is provided, and the engine is configured as a horizontally placed in-line engine in which the cylinder row is in the left-right direction of the vehicle. An exhaust manifold 5 extending toward the rear of the vehicle is attached to a side wall of the cylinder head 3 corresponding to the rear of the vehicle, and a catalyst 6 is disposed in the exhaust manifold 5.

2 is a plan view of the oil pan, FIG. 3 is a cross-sectional view taken along the line XX of FIG. 2, and FIG. 4 is a cross-sectional view taken along the line YY of FIG.
On the outer periphery of the upper surface of the oil pan 7, a mounting flange 8 protrudes outward in a bowl shape and is integrally formed. Bolt holes 9 and 9 are formed in the mounting flange 8 at predetermined intervals over the entire circumference. The oil pan 7 is connected to the bottom side of the cylinder block 2 via the mounting flange 8 by inserting the bolt 10 into each bolt hole 9 and tightening the bolt 10.
The vehicle rear side of the oil pan 7, that is, the side where the exhaust manifold 5 is disposed is covered with a shielding member 12 in order to shield the radiant heat from the exhaust manifold 5 constituting the exhaust system of the engine 1.

  The shielding member 12 is integrally formed in a suspended manner from the mounting flange 8 corresponding to the vehicle rear side of the oil pan 7 so that a gap S is formed between the oil pan 7 and the side wall 7a corresponding to the vehicle rear side. The lower end of the oil pan 7 extends further downward than the bottom surface of the oil pan 7 and is formed as an extending portion 12a bent toward the oil pan 7 side. In addition, as shown in FIG. 2, a plurality of communication holes 15 that communicate the gap S and the exhaust manifold 5 side are formed in the upper portion of the shielding member 12 at intervals in the cylinder row direction. The communication hole 15 is formed toward the catalyst 6 side of the exhaust manifold 15.

  Between the bolt hole 9 and the bolt hole 9 of the mounting flange 8 in which the shielding member 12 is integrally formed, a plurality of openings 14 and 14 penetrating vertically are formed in order to reduce the weight of the oil pan 7. Yes. That is, the mounting flange 8 integrally formed with the shielding member 12 is formed with openings 14 and 14 at intervals in the cylinder row direction. As shown in FIGS. 3 and 4, a plurality of ribs 11, 11, 11 are formed between the openings 14 and the bolt holes 9 so as to project from the side wall 7 a in a substantially horizontal manner. The side wall 7a and the shielding member 12 are connected. The height of the plurality of ribs 11, 11, 11 from the bottom surface 8 a of the mounting flange 8 is formed so as to connect only the upper portions of the side wall 7 a and the shielding member 12. Thereby, the weight of the entire oil pan 7 is reduced and the rigidity of the mounting flange 8 is improved. As shown in FIG. 1, the openings 14 and 14 are closed by a flange on the cylinder block 2 side when the oil pan 7 is attached to the cylinder block 2.

  Further, radiation fins 13 are formed at positions corresponding to the respective openings 14 of the side wall 7a of the oil pan 7 in order to lower the oil temperature of the oil stored in the oil pan 7. The radiating fins 13 are formed vertically from the bottom surface 8 a of the mounting flange 8 to the bottom surface of the oil pan 7.

Next, the movement of the traveling wind W generated as the vehicle on which the engine 1 of the embodiment thus configured is mounted will be described.
A part of the traveling wind W generated as the vehicle travels is introduced into the gap S through the bottom surface of the oil pan 7 and the extending portion 12 a of the shielding member 12. At this time, since the extending portion 12a is formed in a shape bent toward the oil pan 7, the traveling wind W is easily introduced into the gap S.

  The traveling wind W introduced into the gap S comes into contact with the heat dissipating fins 13 and effectively reduces the oil temperature of the oil stored in the oil pan 7 from the communication hole 15 to the catalyst 6 side of the exhaust manifold 5. It is discharged towards. The surrounding area of the exhaust manifold 5 including the catalyst 6 is satisfactorily cooled by the traveling wind W discharged from the communication hole 15. Here, since the openings 14 and 14 are closed by the flange on the cylinder block 2 side, the traveling wind W introduced into the gap S is discharged only from the communication hole 15. Further, the surroundings of the exhaust manifold 5, especially the catalyst 6, is prevented from being overcooled.

  According to the engine 1 of the first embodiment described above, the mounting for the oil pan 7 corresponding to the vehicle rear side so that a gap S is formed between the oil pan 7 and the side wall 7a corresponding to the vehicle rear side. Since the shielding member 12 is integrally formed so as to hang down from the flange 8 and a plurality of communication holes 15 are formed in the upper part of the shielding member 12 so as to communicate the gap S and the exhaust manifold 5 side. The temperature of the oil in the oil pan 7 can be cooled by the wind W, and the surroundings of the exhaust manifold 5 can be satisfactorily cooled by the traveling wind W discharged from the communication hole 15. Moreover, since the heat radiating fins 13 are provided on the side wall 7a of the oil pan 7, the oil temperature of the oil in the oil pan 7 can be effectively cooled. Of course, since the exhaust manifold 5 side of the oil pan 7 is covered by the shielding member 12, the radiant heat from the exhaust manifold 5 can be shielded. In addition, since the shielding member 12 is integrally formed with the oil pan 7, the number of parts can be reduced as compared with a separate member.

  Further, according to the engine 1 of the first embodiment, the lower end of the shielding member 12 extends further downward than the bottom surface of the oil pan 7 and is configured as a bent extending portion 12a. Easy to introduce. Further, a plurality of ribs 11, 11, 11 are formed between the respective openings 14 and the respective bolt holes 9 so as to protrude from the side wall 7 a so as to be substantially horizontal, and the side wall 7 a and the shielding member 12 are connected to each other. Since the connection is made, the entire oil pan 7 can be reduced in weight and the rigidity of the mounting flange 8 can be improved.

  Next, an engine 1A as a second embodiment of the present invention will be described. The engine 1A of the second embodiment has the same configuration as the engine 1 of the first embodiment described above except that the shielding member 12 is changed to the shielding member 120. Therefore, the description of the same configuration as the engine 1 of the first embodiment in the engine 1A as the second embodiment is omitted.

  FIG. 5 is a schematic configuration diagram showing an outline of the configuration of the engine 1A according to the second embodiment of the present invention. As shown in the figure, the engine 1A of the second embodiment is integrally formed so as to hang from the mounting flange 8 so that the shielding member 120 protrudes toward the catalyst 6 from the cylinder block 2. That is, even when the oil pan 7 is attached to the cylinder block 2, a part of each of the plurality of openings 14, 14 is not blocked by the flange on the cylinder block 2 side, and the exhaust manifold 5 The side is in communication. As a result, the traveling wind W introduced into the gap S contacts the heat dissipating fins 13 and effectively reduces the oil temperature of the oil stored in the oil pan 7, while the communication holes 15 and the openings 14, 14. Is exhausted toward the exhaust manifold 5, and the surrounding area of the exhaust manifold 5 including the catalyst 6 is satisfactorily cooled by the traveling wind W discharged from the communication hole 15 and the openings 14 and 14. That is, the engine 1A of the second embodiment is effective when the cooling effect around the exhaust manifold 5 cannot be obtained by the communication holes 15 alone.

  In the shielding members 12 and 120 of the respective embodiments, they are formed integrally with the mounting flange 8 of the oil pan 7, but may be formed separately. In this case, if the bolts 10 are fastened together, it is possible to prevent an increase in the number of parts without requiring additional bolts for attaching the shielding members 12 and 120.

  In the shielding members 12 and 120 of each embodiment, a plurality of communication holes 15 are formed at intervals in the cylinder row direction. However, one communication hole 15 may be provided, and not in the cylinder row direction but in the vertical direction. It may be provided or may be provided randomly.

  In the shielding members 12 and 120 of the respective embodiments, the communication hole 15 is formed so as to face the catalyst 6 side, but it does not matter if it does not face the catalyst 6 side.

  In the shielding members 12 and 120 of the respective embodiments, the lower ends thereof extend further downward than the bottom surface of the oil pan 7, but the lower ends may extend to the bottom surface of the oil pan 7.

  In the shielding members 12 and 120 of the respective embodiments, the lower ends of the shielding members 12 and 120 are further extended below the bottom surface of the oil pan 7, and the extending portions 12a are bent to the oil pan 7 side. The extending portion 12a may not be bent on the oil pan 7 side. Moreover, it is good also as what forms only the surface by the side of the oil pan 7 of the extending | stretching part 12a as the curved surface 12b like the modification shown in FIG.

  In the shielding members 12 and 120 of each embodiment, a plurality of ribs 11, 11, 11 that connect the side wall 7 a and the shielding members 12, 120 are provided, but the number of ribs 11 may be one. .

  In the shielding members 12 and 120 of the respective embodiments, the height from the bottom surface 8a of the mounting flange 8 of the plurality of ribs 11, 11, and 11 is such that only the upper portions of the side wall 7a and the shielding member 12 are connected. The height of the plurality of ribs 11, 11, 11 from the bottom surface 8 a of the mounting flange 8 may reach the bottom surface of the oil pan 7. In this case, as in the modification shown in FIG. 7, in order to communicate the gaps S defined by the plurality of ribs 11, 11, 11, the communication holes are formed in the cylinder row direction side surfaces of the plurality of ribs 11, 11, 11. 11a may be formed.

  In the shielding members 12 and 120 of each embodiment, the radiation fin 13 is formed at a position corresponding to each opening 14 of the side wall 7a of the oil pan 7, but for example, a position corresponding to the bolt hole 9, etc. It may be formed at any position on the side wall 7a.

  In the shielding members 12 and 120 of each embodiment, the radiation fins 13 are provided, but the radiation fins 13 may be omitted.

  As mentioned above, although embodiment of this invention was described using the Example, this invention is not limited to such an Example, In the range which does not deviate from the summary of this invention, it can implement with a various form. Of course.

It is a schematic block diagram of the engine of 1st Example. FIG. 2 is an enlarged plan view of an oil pan of the engine of FIG. 1. FIG. 3 is a cross-sectional configuration diagram of the oil pan in FIG. 2 taken along line XX. FIG. 3 is a cross-sectional configuration diagram along line YY in FIG. 2. It is a schematic block diagram of the engine of 2nd Example. It is a cross-sectional block diagram corresponding to FIG. 3 of a modification. Furthermore, it is a cross-sectional block diagram corresponding to FIG. 3 of another modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine 2 Cylinder block 3 Cylinder head 5 Exhaust manifold 6 Catalyst 7 Oil pan 8 Mounting flange 9 Bolt hole 11 Rib 11a Communication hole 12,120 Shield member 12a Extending part 12b Curved surface 13 Radiation fin 14 Opening part 15 Communication hole S Gap W Running wind

Claims (11)

A shielding member that shields radiant heat radiated to the oil pan from an exhaust system that discharges exhaust gas of the engine, and that can introduce traveling wind generated by vehicle traveling between the oil pan and the oil pan;
A communication hole formed in the shielding member for discharging at least a part of the traveling wind introduced by the shielding member toward the exhaust system;
A heat shield device comprising:   The heat shield apparatus according to claim 1, wherein the shield member is integrally formed with the oil pan.   The heat shielding apparatus according to claim 2, wherein the shielding member is integrally formed in a hanging shape from an attachment flange provided on the oil pan in order to attach the oil pan to the engine body.   The heat shielding apparatus according to claim 3, wherein the shielding member has an extending portion that extends at least below the bottom surface of the oil pan.   The heat shielding apparatus according to claim 4, wherein at least the extending portion is formed into a shape in which the traveling air can be easily introduced.   The heat shielding device according to claim 5, wherein at least the extending portion of the shielding member is bent toward the oil pan.   The heat shielding device according to any one of claims 3 to 6, wherein the shielding member is connected to a rib formed to protrude from a side wall that constitutes a side surface of the oil pan.   A bolt hole for attaching the oil pan to the engine body is formed in the mounting flange, and the bolt hole is formed as an opening penetrating in the vertical direction. A shielding device according to claim 1.   The heat shield apparatus according to claim 8, wherein the rib is disposed between the bolt hole and the opening.   The heat shield device according to any one of claims 1 to 9, wherein the oil pan is formed with heat radiating fins.   The heat-shielding device according to any one of claims 8 to 10, wherein the radiating fin is formed at a position corresponding to the opening of the side wall.

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