JP2014173482A - Heat shielding structure for exhaust component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat shielding structure for exhaust components, which can protect the components arranged around a catalytic converter from heat and improve cooling performance of a radiator.SOLUTION: A radiator 2 is arranged at a vehicle front part in an engine room 1, a transmission 4 is mounted behind the same, and an engine 5 is connected with one side in a vehicle width direction of the transmission 4. A catalytic converter 15 is arranged on a lower side of an exhaust manifold 13 on a vehicle front side of the engine 5, and the catalytic converter 15 is covered with a heat shield cover 17. At one end in the vehicle width direction of the heat shield cover 17, for mounting the heat shield cover 17 to a vehicle front face portion of a flange part 11 formed on a cylinder block for joining the transmission, a mounting part 18 long in a vehicle vertical direction is formed to extend along the shape of the vehicle front face portion of the flange part 11. The heat shield cover 17 is formed with a cover part 20 that reaches the other end in the vehicle width direction, which is on the opposite side from the one end in the vehicle with direction, from the mounting part 18 via a vehicle front part of the catalytic converter 15.

Description

  The present invention relates to a heat shielding structure for an exhaust component, and is suitable for shielding heat from an exhaust component such as a catalytic converter connected to an engine.

  Examples of such a heat shielding structure for exhaust parts include those described in Patent Document 1 below and those described in Patent Document 2 below. Among these, Patent Document 1 below describes a structure in which a cover main body is attached to the front side of the catalyst portion in order to shield the catalyst portion from heat. Further, in Patent Document 2 below, the engine and the transmission are arranged side by side in the vehicle width direction, a radiator fan is arranged on the vehicle front side of the transmission, a catalyst case is attached to the front portion of the engine, A structure in which an exhaust cover that covers the catalyst case is provided on the front side of the vehicle is described.

JP 2005-233039 A JP 2010-65552 A

  The heat insulation structure for exhaust parts described in Patent Document 1 is arranged in a vehicle configuration as described in Patent Document 2, that is, an engine and a transmission are arranged side by side in the vehicle width direction. Consider a case where a radiator is arranged. In this case, the traveling wind that has passed through the fan shroud mounted on the rear side of the radiator collides with the vehicle front surface of the transmission and then flows to the engine side along the vehicle front surface of the transmission. It flows between the front part of the engine. Therefore, there is a possibility that the traveling wind heated in contact with the surface of the catalytic converter flows into an auxiliary machine arranged around the catalytic converter, and the auxiliary machine is heated by heat. Further, the traveling wind heated between the catalytic converter and the engine front part blows back to the vehicle front side of the radiator, and the warm traveling wind flows into the radiator, which may reduce the cooling performance of the radiator. Similarly, in the heat shielding structure of the exhaust part described in the cited document 2, the traveling wind that has passed through the radiator fan collides with the front surface of the transmission vehicle and then flows to the engine side along the front surface of the transmission vehicle. Further, the traveling wind flowing between the catalyst case and the engine front surface is in direct contact with the surface of the catalyst case. Therefore, the heat of the catalyst case is diffused by the traveling wind, and the traveling wind heated by the heat of the catalyst case makes it easy for heat to be carried to the auxiliary equipment arranged around the catalyst case, and the auxiliary equipment is heated. There is a risk of being easily affected.

  The present invention has been made paying attention to the above-described problems, and can protect components arranged around the catalytic converter from heat and improve the cooling performance of the radiator. An object of the present invention is to provide a heat shield structure for exhaust parts.

  In order to solve the above-described problems, an embodiment of the present invention is directed to a heat shielding structure for an exhaust part that shields an exhaust part connected to an engine, a radiator disposed in a front part of a vehicle in an engine room, and the vehicle of the radiator A fan shroud attached to the rear side; a transmission mounted on the rear side of the radiator in the engine room; the engine connected to one side of the transmission in the vehicle width direction; An exhaust manifold attached to the exhaust manifold, a catalytic converter disposed on the vehicle lower side of the exhaust manifold, a heat shield cover disposed to cover the catalytic converter, and one end of the engine in the vehicle width direction, In order to attach the flange portion constituting the joint surface to the transmission and the heat shield cover to the vehicle front portion of the flange portion, An attachment portion formed at one end of the cover in the vehicle width direction and extending in the vehicle vertical direction so as to follow the shape of the vehicle front portion of the flange portion, and the vehicle width from the attachment portion through the vehicle front portion of the catalytic converter A heat shield structure for an exhaust part, comprising: a cover portion formed on the heat shield cover so as to reach the other end portion in the vehicle width direction opposite to the one end portion in the direction.

  The auxiliary machine driven by the crankshaft of the engine is arranged on one side in the vehicle width direction of the catalytic converter, and the cover is provided so as to partition a space where the auxiliary machine is arranged from a space where the catalytic converter is arranged. The vehicle width direction other end portion of the cover portion is extended between the auxiliary machine and the catalytic converter, and the vehicle width direction end portion of the cover portion is protruded to the vehicle front side of the engine from the auxiliary machine. .

  The length of the mounting portion in the vehicle vertical direction is equal to or longer than the length from the vehicle front-side lower end portion to the vehicle front-side upper end portion of the engine cylinder block, and of the cover portion, at least from the mounting portion to the catalytic converter. The length in the vehicle vertical direction up to the front of the vehicle is equal to or longer than the length from the vehicle front side lower end portion to the vehicle front side upper end portion of the cylinder block.

  Further, the vehicle width direction other end portion of the cover portion is connected to a case main body of the catalytic converter via a bracket.

  The other end of the cover in the vehicle width direction is connected to the front side of the cylinder block.

  Thus, according to the embodiment of the invention, the radiator is disposed in the front portion of the vehicle in the engine room, and the fan shroud is attached to the rear side surface of the radiator. In addition, a transmission is mounted in the engine room behind the radiator, the engine is connected to one side of the transmission in the vehicle width direction, and a joint surface for the transmission is formed at one end of the engine in the vehicle width direction. The flange part to be formed is formed. Further, an exhaust manifold is attached to the front of the engine vehicle, a catalytic converter is disposed on the lower side of the exhaust manifold, and a heat shield cover is disposed so as to cover the catalytic converter. At one end of the heat shield cover in the vehicle width direction, in order to attach the heat shield cover to the vehicle front portion of the flange portion, a mounting portion that is long in the vehicle vertical direction is formed so as to follow the shape of the vehicle front portion of the flange portion. To do. And the cover part which reaches the vehicle width direction other end part on the opposite side to the vehicle width direction one end part from the attachment part through the vehicle front part of a catalytic converter was formed in the thermal insulation cover. The traveling wind that passes through the radiator and flows to the rear of the vehicle by the fan shroud hits the front surface of the transmission and flows to the engine side along the surface of the transmission. However, a heat shield cover attachment portion is attached to the front surface portion of the flange portion formed on the engine, and a cover portion is provided from the front side of the catalytic converter to the vehicle width direction other end portion. Therefore, it is possible to prevent the traveling wind flowing from the transmission side to the engine side from coming into contact with the surface of the catalytic converter and preventing the traveling wind flowing from the engine side from flowing between the catalytic converter and the front surface of the engine. Therefore, it is possible to prevent the heat of the catalytic converter from being diffused by the traveling wind. Further, it is possible to prevent the traveling wind flowing between the catalytic converter and the engine front surface from being heated by the catalytic converter. As a result, it is possible to protect components and auxiliary equipment arranged around the catalytic converter from heat. Further, since the traveling wind does not flow between the catalytic converter and the front surface of the engine, it is possible to prevent the traveling wind heated by the catalytic converter from blowing back to the front side of the radiator. Therefore, it is possible to prevent the running wind warmed by the radiator from flowing in, and to improve the cooling performance of the radiator. Further, since the traveling wind hitting the transmission can be prevented from flowing to the engine side, the traveling wind that has passed through the fan shroud from the radiator can be smoothly flowed to the rear of the vehicle, and the cooling performance of the radiator is improved. be able to.

  In addition, an auxiliary machine driven by the crankshaft of the engine is arranged on one side of the catalytic converter in the vehicle width direction. Then, the other end in the vehicle width direction of the cover part is extended between the auxiliary machine and the catalytic converter so as to partition the space in which the auxiliary machine is arranged and the space in which the catalytic converter is arranged, The end protruded from the auxiliary machine toward the front side of the vehicle. Thus, the catalytic converter and the auxiliary machine are partitioned by the cover portion of the heat shield cover, and heat can be prevented from being transferred from the catalytic converter to the auxiliary machine. As a result, the auxiliary machine arranged around the catalytic converter can be protected from heat.

  Further, the length of the mounting portion in the vehicle vertical direction is set to be equal to or longer than the length from the vehicle front side lower end portion of the cylinder block to the vehicle front side upper end portion. Further, in the cover portion, at least the length in the vehicle vertical direction from the attachment portion to the vehicle front side of the catalytic converter is set to be longer than the length from the vehicle front side lower end portion of the cylinder block to the vehicle front side upper end portion. Therefore, even if the traveling wind that has passed through the fan shroud of the radiator collides with the front of the transmission and flows to the engine side, the traveling wind is placed between the catalytic converter and the front of the engine by the heat shield cover mounting portion and the cover. Inflow can be prevented. Accordingly, it is possible to prevent the traveling wind from being removed from the vehicle rear side of the catalytic converter and to prevent the traveling wind from being heated by the catalytic converter. Therefore, diffusion of heat in the catalytic converter can be prevented, and auxiliary equipment arranged around the catalytic converter can be protected from heat. Further, since the traveling wind does not flow between the catalytic converter and the front surface of the engine, it is possible to prevent the traveling wind heated by the catalytic converter from blowing back to the front side of the radiator. Therefore, it is possible to prevent the running wind warmed by the radiator from flowing in, and to improve the cooling performance of the radiator.

  Further, by connecting the other end of the cover portion in the vehicle width direction to the case main body of the catalytic converter via a bracket, the gap between the surface of the catalytic converter and the cover portion of the heat shield cover can be kept constant. As a result, the heat shield cover and the catalytic converter can be prevented from coming into contact with each other due to vehicle vibration, and a constant air layer can be maintained between the heat shield cover and the catalytic converter. As a result, it is possible to make it difficult for the heat of the catalytic converter to leak into the engine room by the air layer between the heat shield cover and to protect the auxiliary equipment arranged around the catalytic converter from the heat.

  Further, by connecting the other end of the cover in the vehicle width direction to the front side of the cylinder block, the catalytic converter and the auxiliary machine are partitioned, and heat is transferred from the catalytic converter to the auxiliary machine. Can be prevented. As a result, the auxiliary machine arranged around the catalytic converter can be protected from heat.

It is a top view of the vehicle front part which shows an example of the vehicle to which the heat insulation structure of the exhaust components of this invention was applied. It is a side view of the vehicle front part of FIG. 1 is a perspective view of an engine showing a first embodiment of a heat shield structure for an exhaust part of the present invention. It is a front view of the engine of FIG. It is XX sectional drawing of FIG. It is explanatory drawing of the return of driving | running | working wind. FIG. 6 is a cross-sectional view taken along the line XX showing a modification of the heat shielding structure for the exhaust part in the engine of FIG. 4. FIG. 6 is a sectional view taken along line XX showing a further modification of the heat shielding structure for the exhaust part in the engine of FIG. 4. It is a perspective view of the engine which shows 2nd Embodiment of the heat insulation structure of the exhaust components of this invention. FIG. 10 is a front view of the engine of FIG. 9.

  Next, a first embodiment of the heat shielding structure for an exhaust part of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing an example of a front portion of a vehicle to which a heat shielding structure for exhaust parts of the present embodiment is applied, and FIG. 2 is a side view of the front portion of the vehicle in FIG. The vehicle according to the present embodiment has an engine room 1 in the front part of the vehicle, and a radiator 2 is arranged in the front part of the engine room 1. A fan shroud 3 is attached to the rear side surface of the radiator 2. The fan shroud 3 originally means a wind guide plate that guides the air flow from the radiator fan to the radiator 2, but also has a function of rectifying traveling air that has passed through the radiator 2.

  A transmission 4 is disposed behind the radiator 2 in the vehicle. An engine 5 is connected to the right side of the transmission 4, that is, one side in the vehicle width direction. FIG. 3 is a perspective view of the engine 5 of the present embodiment mounted on the front portion of the vehicle in FIG. 1, and FIG. 4 is a front view of the engine 5 in FIG. In the engine 5 of this embodiment, a cylinder head 7 is attached to the upper end surface of the cylinder block 6, and a cylinder head cover 8 is attached to the upper end surface of the cylinder head 7. A crankcase for accommodating the crankshaft 10 is formed at the lower part of the cylinder block 6, and an oil pan 9 is attached below the crankcase.

  A plurality of, in the present embodiment, three combustion chambers (not shown) are formed along the cylinder row on the joint surface of the cylinder head 7 with the cylinder block 6. Accordingly, the axis of the crankshaft 10 is parallel to the arrangement direction of the combustion chambers, that is, the cylinder row, and in the present embodiment, coincides with or is parallel to the vehicle width direction. The engine 5 is mounted on the vehicle in various orientations, but is mounted so that the cylinder head 7 is approximately upward with respect to the cylinder block 6, so that the direction is the engine upper side, and the opposite direction is the engine lower side. Define.

  In the engine 5, a flange portion 11 that forms a joint surface with the transmission 4 is formed at an end of the cylinder block 6 on the transmission 4 side, that is, at one end in the vehicle width direction. The flange portion 11 is formed so as to extend from the cylinder portion of the cylinder block 6 so as to be joined to a case expansion portion of the transmission 4 that is generally called a bell housing. The engine 5 and the transmission 4 are connected by joining the end surface of the flange portion 11 to the case enlargement portion of the transmission 4. As described above, when one side in the vehicle width direction is the side where the engine 5 is connected to the transmission 4, the flange portion 11 is formed on the other side in the vehicle width direction of the engine 5. Although it can also be called a part, it is simply referred to as one end part in the vehicle width direction of the engine 5 here.

  An intake manifold 12 for supplying air to the combustion chamber is attached to the engine 5 on the vehicle rear side of the cylinder head 7. On the other hand, an exhaust manifold 13 that collects exhaust from the combustion chamber is attached to the front side of the cylinder head 7 in the vehicle. An exhaust pipe 14 is connected to the exhaust manifold 13 below the vehicle, and a catalytic converter 15 is interposed in the middle of the exhaust pipe 14. That is, the catalytic converter 15 of this embodiment is disposed in front of the engine 5 and below the exhaust manifold 13, that is, approximately in front of the cylinder block 5. In the present embodiment, an air conditioner compressor 16 is disposed as an auxiliary machine driven by the crankshaft 10 on the right side of the catalytic converter 15 in the vehicle, that is, on one side in the vehicle width direction.

  A catalyst for purifying exhaust from the combustion chamber is housed inside the catalytic converter 15. This catalyst is said to exhibit its exhaust purification function only at a certain high temperature. Therefore, in this embodiment, the catalytic converter 15 is disposed immediately downstream of the exhaust manifold 13. On the other hand, accessories such as the air conditioner compressor 16 are preferably used within a preset temperature, and excessive temperature rise should be avoided. Therefore, in this embodiment, the outer periphery of the catalytic converter 15 is covered with the heat shield cover 17 so as to shield the heat.

  FIG. 5 is a cross-sectional view taken along the line XX of FIG. 4, and particularly shows a cross section of the heat shield cover 17 well. As is clear from the figure, the heat shield cover 17 of the present embodiment is attached to the vehicle front portion of the flange portion 11 formed at one end of the cylinder block 6 in the vehicle width direction of the engine 5. For this reason, the heat shield cover 17 has a mounting portion 18 at one end in the vehicle width direction (= the other end in the vehicle width direction). The attachment portion 18 is formed in a longitudinal direction in the vehicle vertical direction so as to follow the vehicle front portion of the flange portion 11. Therefore, when the mounting portion 18 is applied to the vehicle front portion of the flange portion 11 and the mounting portion 18 is fixed to the vehicle front portion of the flange portion 11 with a fastener 19 such as a bolt, the mounting portion 18 is mounted on the front surface of the flange portion 11. Close contact with the part. The heat insulating cover 17 has a cover portion 20 that reaches the other end portion in the vehicle width direction of the catalytic converter 15 (= the end portion on the one side in the vehicle width direction) from the mounting portion 18 through the vehicle front of the catalytic converter 15. Is formed.

  The cover 20 has a semi-cylindrical shape corresponding to the case of the catalytic converter 15 in a portion covering the vehicle front side of the catalytic converter 15, and the other end in the vehicle width direction from there is the engine 5 (cylinder block 6). It protrudes in a flat plate shape. That is, the vehicle width direction other end part of the cover part 20 is extended between the air conditioner compressor 16 and the catalytic converter 15 so that the arrangement space of the air conditioner compressor 16 which is an auxiliary machine and the arrangement space of the catalytic converter 15 may be partitioned. . In the present embodiment, the vehicle width direction other end portion side of the cover portion 20 protrudes more to the engine side than the air conditioner compressor 16. In addition, in this embodiment, it is a so-called free end state in which the vehicle width direction other end part side of the cover part 20 is not supported.

  By the mounting portion 18 and the cover portion 20 of the heat shield cover 17, the transmission 4 side of the catalytic converter 15 in front of the engine 5, that is, the other side in the vehicle width direction is partitioned. Therefore, for example, as shown by a white arrow in FIG. 5, traveling wind that has passed through the fan shroud 3 from the radiator 2 hits the transmission 4. The traveling wind hitting the transmission 4 tends to flow toward the engine 5 along the vehicle front surface of the transmission 4. However, since the front portion of the vehicle of the engine 5 is partitioned from the transmission 4 side by the mounting portion 18 and the cover portion 20 of the heat shield cover 17, the traveling wind substantially does not flow on the front side of the vehicle of the engine 5 or almost. Not flowing. Of course, the traveling wind does not flow or hardly flows between the catalytic converter 15 and the front surface of the engine 5. Therefore, the heat of the catalytic converter 15 is not or hardly diffused by the traveling wind, and the traveling wind is not or hardly heated by the surface of the catalytic converter 15. Further, the traveling wind flowing between the catalytic converter 15 and the front surface of the engine 5 and heated by the catalytic converter 15 does not blow back to the vehicle front side of the radiator 2 as described later.

  FIG. 6 schematically shows the blowback of the traveling wind toward the vehicle front side of the radiator 2. In this explanatory view, only the vehicle front side of the catalytic converter 15 is covered by the heat shield cover 17, and the vehicle front portion of the cylinder block 6 and the transmission 4 are not partitioned. In such a case, the traveling wind that flows to the engine 5 side after hitting the vehicle front surface of the transmission 4 and flows between the catalytic converter 15 and the vehicle front surface of the engine 5 blows back to the vehicle front side of the radiator 2 again. End up. The blowback of the traveling wind is referred to as blowback, and the blown back traveling wind is heated by the catalytic converter 15. When the heated high-temperature blowback traveling wind passes through the radiator 2, the cooling performance of the radiator 2 is deteriorated. In addition, such a flow of traveling wind diffuses the heat of the catalytic converter 15, and the air conditioning compressor 16 that is an auxiliary machine is heated by the heated traveling wind.

  As described above, in the heat shielding structure for exhaust parts according to the present embodiment, the radiator 2 is disposed in the front portion of the vehicle in the engine room 1, and the fan shroud 3 is attached to the rear side surface of the radiator 2. Further, a transmission 4 is mounted in the engine room 1 behind the radiator 2, and an engine 5 is connected to one side of the transmission 4 in the vehicle width direction. The flange part 11 which comprises the joining surface with respect to the machine 4 is formed. In addition, an exhaust manifold 13 is attached to the front side of the engine 5, a catalytic converter 15 is disposed on the vehicle lower side of the exhaust manifold 13, and a heat shield cover 17 is disposed so as to cover the catalytic converter 15. At one end of the heat shield cover 17 in the vehicle width direction, in order to attach the heat shield cover 17 to the vehicle front portion of the flange portion 11, the heat shield cover 17 is long in the vehicle vertical direction so as to follow the shape of the vehicle front portion of the flange portion 11. A mounting portion 18 is formed. Then, a cover portion 20 that reaches the other end portion in the vehicle width direction opposite to the one end portion in the vehicle width direction through the vehicle front portion of the catalytic converter 15 from the mounting portion 18 is formed in the heat shield cover 17. The traveling wind that passes through the radiator 2 and flows rearward of the vehicle by the fan shroud 3 hits the front surface of the transmission 4 and flows toward the engine 5 along the surface of the transmission 4. However, the mounting portion 18 of the heat shield cover 17 is attached to the front surface portion of the flange portion 11 formed in the engine 5, and then the cover portion 20 passes from the front side of the catalytic converter 15 to the vehicle width direction other end portion side. Is provided. Therefore, the traveling wind flowing from the transmission 4 side to the engine 5 side is prevented from coming into contact with the surface of the catalytic converter 15, and the traveling wind flowing from the engine 5 side is prevented from flowing between the catalytic converter 15 and the front surface of the engine 5. be able to. Therefore, it is possible to prevent the heat of the catalytic converter 15 from being diffused by the traveling wind. Further, the traveling wind flowing between the catalytic converter 15 and the front surface of the engine 5 can be prevented from being heated by the catalytic converter 15. As a result, it is possible to protect components and auxiliary equipment arranged around the catalytic converter 15, for example, the air conditioner compressor 16 from heat. Further, since the traveling wind does not flow between the catalytic converter 15 and the front surface of the engine 5, it is possible to prevent the traveling wind heated by the catalytic converter 15 from blowing back to the vehicle front side of the radiator 2. Therefore, it is possible to prevent the warmed traveling wind from flowing into the radiator 2 and improve the cooling performance of the radiator. Further, since the traveling wind hitting the transmission 4 can be prevented from flowing to the engine 5 side, the traveling wind that has passed through the fan shroud 3 from the radiator 2 can flow smoothly to the rear of the vehicle. Cooling performance can be improved.

  An air conditioner compressor 16 driven by the crankshaft 10 of the engine 5 is disposed on one side of the catalytic converter 15 in the vehicle width direction. Then, the other end in the vehicle width direction of the cover portion 20 is extended between the air conditioner compressor 16 and the catalytic converter 15 so as to partition the space in which the air conditioner compressor 16 is disposed and the space in which the catalytic converter 15 is disposed. The end portion of the portion 20 in the vehicle width direction is protruded from the air conditioner compressor 16 toward the vehicle front side of the engine 5. Thereby, the catalytic converter 15 and the air conditioner compressor 16 can be partitioned by the cover portion 20 of the heat shield cover 17, and heat can be prevented from being transmitted from the catalytic converter 15 to the air conditioner compressor 16. As a result, the auxiliary machines arranged around the catalytic converter 15 can be protected from heat.

  FIG. 7 is a cross-sectional view taken along the line XX showing a modification of the heat shielding structure of the exhaust part in the engine of FIG. In this modification, of the cover part 20 of the heat shield cover 17, the other end in the vehicle width direction is connected to the catalytic converter 15 via a bracket 21 and a fastener 22 such as a bolt. In the present embodiment, the bracket 21 is fixed to the outer wall portion of the catalytic converter 15 in advance, and a fastener 22 is inserted into the bracket 21 and the cover portion 20 of the heat shield cover 17 to couple them together. As shown in FIG. 5, when the other end in the vehicle width direction of the cover portion 20 is in a free end state, the gap between the surface of the catalytic converter 15 and the cover portion 20 is likely to fluctuate. There is a risk of it. Since the gap between the surface of the catalytic converter 15 and the cover portion 20 functions as an air heat insulating layer, the heat shield effect of the heat shield cover 17 can be improved by making this gap constant.

  As described above, in the heat shielding structure for the exhaust part of FIG. 7, the other end of the cover 20 in the vehicle width direction is connected to the case main body of the catalytic converter 15 via the bracket 21. The gap between the cover 17 and the cover portion 20 can be kept constant. As a result, the heat shield cover 17 and the catalytic converter 15 can be prevented from contacting each other due to vehicle vibration, and a constant air layer can be maintained between the heat shield cover 17 and the catalytic converter 15. As a result, it is possible to make it difficult for the heat of the catalytic converter 15 to leak into the engine room by the air layer between the heat shield cover 17 and to protect the auxiliary equipment arranged around the catalytic converter 15 from the heat. it can.

  8 is an XX cross-sectional view showing a further modification of the heat shielding structure for the exhaust part in the engine of FIG. In this modification, the vehicle width direction other end portion of the cover portion 20 of the heat shield cover 17 is further extended to the engine 5 (cylinder block 6) side, and the vehicle width direction other end portion of the cover portion 20 is a cylinder block. 6 was connected to the vehicle front side portion by a fastener 22. Thus, the catalytic converter 15 and the air conditioner compressor 16 are partitioned, and heat can be prevented from being transferred from the catalytic converter 15 to the air conditioner compressor 16. As a result, the auxiliary machines arranged around the catalytic converter 15 can be protected from heat.

  FIG. 9 is a perspective view of an engine showing a second embodiment of the heat shielding structure for exhaust parts of the present invention, and FIG. 10 is a front view of the engine of FIG. The configuration in the engine room 1 in which the engine 5 of the present embodiment is mounted is the same as that of the first embodiment. In the present embodiment, in the heat shield cover 17, the length of the mounting portion 18 in the vehicle vertical direction is equal to or longer than the length from the vehicle front lower end to the vehicle front upper end of the cylinder block 6. Further, in the cover portion 20 of the heat shield cover 17, at least the length in the vehicle vertical direction from the attachment portion 18 to the front of the vehicle of the catalytic converter 15 is the length from the vehicle front side lower end portion of the cylinder block 6 to the vehicle front side upper end portion. That is all.

  Therefore, even if the traveling wind that has passed through the fan shroud 3 of the radiator 2 collides with the front surface of the transmission 4 and flows to the engine 5 side, the traveling wind is converted by the mounting portion 18 and the cover portion 20 of the heat shield cover 17 into the catalytic converter. It can prevent flowing between 15 and the front surface of the engine 5. Thus, it is possible to prevent the traveling wind from coming out from the vehicle rear side of the catalytic converter 15 and to prevent the traveling wind from being heated by the catalytic converter 15. Therefore, diffusion of heat in the catalytic converter 15 can be prevented, and the air conditioner compressor 16 disposed around the catalytic converter 15 can be protected from heat. Further, since the traveling wind does not flow between the catalytic converter 15 and the front surface of the engine 5, it is possible to prevent the traveling wind heated by the catalytic converter 15 from blowing back to the vehicle front side of the radiator 2. Therefore, it is possible to prevent the warmed running wind from flowing into the radiator 2 and improve the cooling performance of the radiator 2.

  In the above embodiment, the auxiliary machine arranged on one side of the catalytic converter 15 in the vehicle width direction is the air conditioner compressor 16, but the auxiliary machine arranged on the one side of the catalytic converter in the vehicle width direction is other than the air conditioner compressor 16. Alternatively, two or more auxiliary machines including an air conditioner compressor may be arranged.

DESCRIPTION OF SYMBOLS 1 Engine room 2 Radiator 3 Fan shroud 4 Transmission 5 Engine 6 Cylinder block 7 Cylinder head 8 Cylinder head cover 9 Oil pan 10 Crankshaft 11 Flange part 12 Intake manifold 13 Exhaust manifold 14 Exhaust pipe 15 Catalytic converter 16 Air conditioner compressor 17 Heat shield cover 18 Mounting portion 19 Fastener 20 Cover portion 21 Bracket 22 Fastener

Claims (5)

In the heat insulation structure of the exhaust parts that shields the exhaust parts connected to the engine,
A radiator disposed in the front of the vehicle in the engine room;
A fan shroud attached to the rear side surface of the radiator;
A transmission mounted on the rear side of the radiator in the engine room;
The engine connected to one of the transmissions in the vehicle width direction;
An exhaust manifold mounted in front of the engine vehicle;
A catalytic converter disposed on the vehicle lower side of the exhaust manifold;
A heat shield cover arranged to cover the catalytic converter;
A flange portion that is formed at one end of the engine in the vehicle width direction and forms a joint surface with respect to the transmission;
The heat shield cover is formed at one end of the heat shield cover in the vehicle width direction so as to be attached to the front surface of the flange portion of the vehicle. And
And a cover portion formed on the heat shield cover so as to reach the other end portion in the vehicle width direction opposite to the one end portion in the vehicle width direction from the mounting portion through the vehicle front portion of the catalytic converter. Heat insulation structure for exhaust parts. An auxiliary machine driven by the crankshaft of the engine is disposed on one side in the vehicle width direction of the catalytic converter,
The vehicle width direction other end portion of the cover portion is extended between the auxiliary device and the catalytic converter so as to partition a space in which the auxiliary device is arranged and a space in which the catalytic converter is arranged, and the cover The heat shielding structure for exhaust parts according to claim 1, wherein an end of the vehicle in the vehicle width direction protrudes toward the vehicle front side of the engine from the auxiliary machine. The length of the mounting portion in the vehicle vertical direction is equal to or longer than the length from the vehicle front side lower end portion of the engine cylinder block to the vehicle front side upper end portion,
Of the cover portion, at least the length in the vehicle vertical direction from the mounting portion to the vehicle front of the catalytic converter is equal to or longer than the length from the vehicle front lower end portion to the vehicle front upper end portion of the cylinder block. The heat shielding structure for exhaust parts according to claim 1 or 2.   The heat shielding structure for an exhaust part according to claim 3, wherein the other end portion in the vehicle width direction of the cover portion is connected to a case main body of the catalytic converter via a bracket.   The heat shielding structure for an exhaust part according to claim 3, wherein the other end portion in the vehicle width direction of the cover portion is connected to a vehicle front side portion of the cylinder block.

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