JP2019188999A - Vehicle front part structure - Google Patents

Abstract

To prevent an electronic component, wiring and the like inside a cover member from being damaged by heat while improving fuel efficiency by covering an engine with the cover member to warm air soon at the time of restarting the engine.SOLUTION: Below a bonnet 28, with respect to a part Zuc in a vehicle width direction of at least a front part in a vehicle longitudinal direction of an upper wall 31 of a cover member 30 covering an upper surface and a peripheral side surface of an engine 1, a space between the part and the engine 1 is formed larger than the other site, and with respect to a site Zbc positioned above exhaust-system main components 18 and 19, a space between the site and the engine 1 is formed larger than the other sites Zbr and Zbl, in the vehicle width direction of a rear wall 34 of the cover member 30.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle front structure that includes a cover member that covers an upper surface and a surrounding side surface of an engine below a bonnet.

Generally, when the vehicle is stopped outdoors for a predetermined time (for example, 8 hours or more), the engine temperature decreases to the outside air temperature.
In view of this, a configuration has been developed in which a cover member that covers the upper surface and surrounding side surfaces of the engine with heat retaining properties is provided so that the engine temperature does not drop to the outside air temperature (see, for example, Patent Document 1).

  With this configuration, a decrease in engine temperature is suppressed, restarting from the highest possible temperature is possible when the engine is restarted, and fuel consumption is improved by encouraging early warm-up while suppressing the fuel injection amount during warm-up. I can expect.

  By the way, in the configuration in which the engine is covered with the cover member in this way, for example, when the engine generates high temperature due to high load operation such as continuing uphill traveling for a long time, the ambient temperature inside the cover member becomes extremely high. (For example, 120 degrees or more), internal machine parts provided inside the cover member (for example, electronic parts such as various sensors, long objects such as harnesses, engine parts such as couplers, connectors, packings, and engine-related parts) There is concern about the effects of heat damage.

  On the other hand, in Patent Document 1 described above, in a vehicle engine encapsulation structure provided with a dedicated cover member that covers the engine upper side and the engine side, as a countermeasure against the heat damage as described above, By guiding the air (running wind) taken inside to the exhaust system main parts (exhaust manifold and exhaust purification system) provided at the rear of the engine, the exhaust system main parts that are particularly hot in the engine are cooled efficiently. A configuration including a nozzle-shaped exhaust system cooling air guiding guide (11) is seen.

  However, in the case where the engine generates heat at a high temperature due to the high load operation described above, the exhaust system cooling air guiding guide (11) is used to flow air until cooling toward the main exhaust system parts. As the heat released from the exhaust system component rises while being diffused (so-called hot air rise), there is a concern about the influence of the heat damage of the internal machine component provided inside the cover member.

  For example, when the nozzle diameter of the exhaust system cooling air guiding guide (11) is increased to increase the cooling effect of the exhaust system main components, the exhaust system cooling air guiding guide (11) inside the cover member There arises a new problem that the layout performance is degraded.

  In particular, the exhaust system main parts are kept in a temperature range in which the catalyst provided in the exhaust emission control device is easily activated even after the engine is stopped, and thus continue to dissipate heat even after the engine is stopped. For this reason, after the engine is stopped, which cannot cool the exhaust system main parts using the traveling wind, the influence of the heat damage due to the rise of hot air from the exhaust system main parts described above becomes significant.

JP 2013-119384 A

  Accordingly, the present invention covers the engine with a cover member, thereby preventing heat damage to the internal components such as electronic components and wiring inside the cover member while improving fuel efficiency due to early warm-up when the engine is restarted. An object of the present invention is to provide a vehicle front structure.

  The present invention is a vehicle front structure provided with a cover member that covers an upper surface and a surrounding side surface of an engine below a bonnet, and a part of the front wall of the upper surface of the cover member in the vehicle width direction is between the engine and the engine. The space between the engine and the portion located above the exhaust manifold and the exhaust purification device in the vehicle width direction of the rear wall of the cover member is formed wider than the other portions. It is what.

  According to the above configuration, the air passage (scavenging passage) is formed inside the cover member by forming a wide space between the cover member and the engine in a part in the vehicle width direction of the front wall front portion of the cover member. Therefore, the hot air released from the exhaust manifold and the exhaust purification device can be efficiently scavenged.

  Therefore, by covering the engine with the cover member, it is possible to improve the fuel efficiency due to the early warm-up when the engine is restarted, and to prevent thermal damage such as electronic components and wiring inside the cover member.

  As an aspect of the present invention, the fan is operated for a predetermined period when the engine is stopped immediately after the high load operation.

  According to the above configuration, hot air can be surely scavenged by the fan wind even when the engine is stopped.

  As an aspect of the present invention, a sound absorbing material is provided on the inner wall surface of the cover member, and the sound absorbing material at the portion of the upper wall that coincides with the exhaust manifold and the exhaust purification device in the vehicle width direction is made thinner than other portions. A second cover for covering the engine body (cylinder head) from above is provided below the upper wall, and a sound absorbing material is provided on the inner wall surface of the second cover.

  According to the above configuration, by forming the sound absorbing material in the portion that matches the exhaust manifold and the exhaust purification device in the vehicle width direction to be thinner than the other portions, the space between the engine and the engine is broadly formed, that is, the ventilation path is formed. Can be formed. The scavenging air (running air, fan air) taken into the ventilation path from the front of the engine can be made to flow more efficiently toward the exhaust manifold and the exhaust purification device, and the atmosphere inside the cover member can be heated. Can be prevented.

  Furthermore, by forming the sound absorbing material thinly, by forming a ventilation path inside the cover member, the sound insulation of the upper wall is concerned by forming the sound absorbing material thin without affecting the outer shape line of the cover member. A decrease in performance can be prevented by the second cover.

  The portion of the upper wall of the cover member that coincides with the exhaust manifold and the exhaust purification device in the vehicle width direction is not limited to the case where it completely coincides, but includes that at least part of the vehicle width direction coincides.

  As an aspect of the present invention, a flat vertical wall surface that is continuous in the vertical direction is formed on the front side of an intake system component that is provided on the front side of the engine.

  According to the above configuration, the scavenging air can be smoothly guided to the inside of the cover member along the vertical wall surface.

  As an aspect of the present invention, protrusions that protrude forward with respect to the vertical wall surface and extend continuously in the vertical direction are provided on both sides of the vertical wall surface.

  According to the above configuration, the scavenging air flowing toward the inside of the cover member (the engine upper layer portion) along the vertical wall surface can be guided by the protrusions on both sides of the vertical wall surface. Can be guided more smoothly inside.

  As an aspect of the present invention, with respect to a portion of the rear wall of the cover member in the vehicle width direction that is not positioned above the exhaust manifold and the exhaust purification device, the interval between the engine rear portion and the cover member rear wall is set to another portion in the vehicle width direction. It is formed narrower.

  According to the above configuration, the rising of hot air from the exhaust manifold and the exhaust purification device can be promoted, and it becomes easy to avoid the influence of the heat damage caused by the rising of the hot air of the internal unit parts, and the heat rising due to the rising of hot air is removed by the scavenging air. Facilitates scavenging.

  As an aspect of the present invention, in the vehicle width direction of the rear wall of the cover member, the parts that are not located on the top of the exhaust manifold and the exhaust purification device are aggregated from the parts that are located on the top of the main exhaust system parts. By disposing, this portion is formed so that a substantial gap between the rear portion of the engine and the rear wall of the cover member is narrower than the portion located at the upper part of the exhaust manifold and the exhaust purification device.

  According to the above configuration, the engine rear part in this part is arranged by arranging the internal machine parts such as the exhaust related parts in the part offset in the vehicle width direction with respect to the upper part of the exhaust manifold and the exhaust purification device. The substantial space (space) between the rear wall of the cover member can be narrowed, and the penetration and diffusion of heat released from the exhaust manifold and the exhaust purification device can be suppressed. Thus, it is possible to avoid heat damage from being caused to the internal machine parts due to the rise of hot air from the exhaust manifold and the exhaust purification device, and it is possible to promote the rise of hot air directly above the exhaust manifold and the exhaust purification device.

  Furthermore, the flow of the scavenging air that scavenges the heat rising from the exhaust manifold and the exhaust purification device flows by concentrating and arranging the internal parts at a position offset in the vehicle width direction with respect to the exhaust manifold and the exhaust purification device. A road can be secured.

  As an aspect of the present invention, the space between the engine rear portion and the cover member rear wall in the vehicle width direction of the rear wall of the cover member is positioned above the exhaust manifold and the exhaust emission control device at a position where the distance between the engine rear portion and the cover member rear wall is narrow. Internal machine parts (for example, electronic parts, harnesses, etc.) having a heat resistant temperature lower than that of the parts are collectively arranged.

  According to the above configuration, it is possible to achieve both the scavenging of heat by the scavenging air (running air, fan air) and the protection of the internal machine parts against the rising of hot air when the vehicle is stopped (returning hot air from the engine upper layer to the front).

  As an aspect of the present invention, a heat insulation / sound insulation material is attached to the rear part of the engine, and a portion of the heat insulation / sound insulation material positioned above the exhaust manifold and the exhaust gas purification device in the vehicle width direction is formed thinner than other portions. It is what.

  According to the above configuration, the heat insulating / sound insulating material attached to the rear part of the engine can protect the engine components provided in the engine against the hot air from the exhaust manifold and the exhaust purification device, and can propagate from the rear of the engine. The engine combustion noise can be effectively insulated.

  Further, by forming a portion of the heat insulating / sound insulating material positioned above the exhaust manifold and the exhaust purification device in the vehicle width direction so as to be thinner than other portions, the exhaust air and the exhaust purification device are promoted to rise in hot air. In addition, the temperature around the exhaust purification device can be prevented from becoming high.

  According to the present invention, by covering the engine with the cover member, it is possible to improve the fuel efficiency due to the early warm-up when the engine is restarted, and to heat damage to the internal parts such as the electronic components and wiring inside the cover member. Can be prevented.

The center longitudinal cross-sectional view of the vehicle width direction which shows the principal part of the front part structure of the vehicle of this embodiment. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1. The bottom view of the upper cover part of the cover member of this embodiment. FIG. 4 is a cross-sectional view taken along line BB in FIG. 3. The enlarged view of the area | region Yr in FIG. The enlarged view of the area | region Xf in FIG. 1, and the enlarged view of the area | region Yr in FIG. The enlarged view of the area | region Xr in FIG. The schematic perspective view which looked at the power unit with which the cover member 30 was equipped with the front part structure of the vehicle of this embodiment from the back and upper direction. FIG. 3 is a schematic plan view of the power unit with the cover member 30 removed, which is provided in the vehicle front structure according to the present embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In the figure, arrow F indicates the front of the vehicle, arrow R indicates the right side of the vehicle, arrow L indicates the left side of the vehicle, and arrow U indicates the upper side of the vehicle.

  FIG. 1 shows a vehicle front structure according to the present embodiment. First, a premise structure of a vehicle front structure V according to the present embodiment will be described mainly with reference to FIG.

  As shown in FIG. 1, an engine room E in which an engine 1 is installed is provided in the front structure V of the present embodiment. The engine room E is partitioned on the front side of the vehicle by a front grill 2, a front bumper 3, a shroud 4, and the like. The engine room E is partitioned on the vehicle rear side by a dash panel 5 and a cowl panel 6 extending in the vertical direction. A floor panel 7 constituting a vehicle body floor surface and extending substantially horizontally toward the rear is integrally or integrally formed below the dash panel 5.

  A tunnel portion 8 (a so-called floor tunnel) that protrudes into the vehicle interior and extends in the vehicle front-rear direction is formed at the vehicle width direction center portion of the floor panel 7 described above.

  The engine room E is partitioned by a bonnet 28 that covers the upper part of the engine room E so as to be openable and closable by an under cover 9 that extends in the horizontal direction at the lower part.

  Also, in this engine room E, a pair of left and right front side frames (not shown) configured in a closed cross-sectional shape extending in the vehicle front-rear direction are installed on the left and right sides spaced apart in the vehicle width direction. 1 etc. are supported by these between a pair of left and right front side frames.

  A reference numeral 27 in FIG. 1 denotes a bumper reinforcement formed in a closed cross-sectional shape extending in the vehicle width direction on the front side of the engine room E. The bumper reinforcement 27 is provided at the front end of a pair of left and right front side frames. They are connected via a crush can (not shown) that extends further forward from the vehicle.

The engine 1 installed in the engine room E is a so-called horizontal engine in which a crankshaft (not shown) is arranged in the vehicle width direction, and is a general I-type four-cylinder reciprocating engine. . As shown in FIGS. 2, 8, and 9, a transmission T is arranged in a series position on one side of the engine 1 (the left side of the vehicle in this example), and the power unit is configured by the transmission T and the engine 1. 10 is configured.
2, 8, and 9 is a box-shaped battery disposed on the left side of the engine 1, and a transmission T is provided below the battery 12.

  As shown in FIG. 1, a main body 11 (cylinder) of an engine 1 includes a cylinder block 11a, a cylinder head 11b having a number of intake ports and exhaust ports corresponding to cylinders, and a cylinder head cover that covers the cylinder head 11b from above. 11c, and an oil pan 11d is attached to the lower part of the cylinder block 11a.

  An intake system 14 including an intake manifold 15 and a turbocharger system 16 is disposed on the front side of the vehicle with respect to the engine main body 11, while an exhaust manifold 18 (hereinafter referred to as “exhaust manifold 18”) is disposed on the rear side of the vehicle. A so-called front intake rear exhaust layout is adopted by disposing an exhaust system 17 including an exhaust purification device 19 for reducing NOx) and the like.

  In this exhaust system 17, the exhaust purification device 19 includes a three-way catalyst 19 a as a catalyst on the front side in the interior thereof. Further, an exhaust pipe 26 that guides exhaust gas from the engine 1 to an exhaust silencer (not shown) at the rear of the vehicle is connected to the downstream side of the exhaust purification device 19.

  The exhaust manifold 18, the exhaust purification device 19, and the exhaust pipe 26 are located at a substantially central portion in the vehicle width direction of the vehicle body. Among these, the exhaust pipe 26 is located below (internally) the tunnel portion 8 located at the center in the vehicle width direction. (Refer to FIG. 2).

  Thus, since the exhaust system 17 is arranged on the rear side of the engine 1, the temperature in the engine room E behind the engine 1 becomes extremely high in the present embodiment.

  The aforementioned shroud 4 is disposed in a standing position on the rear side of the front grille 2 and the front bumper 3 and on the front side of the power unit 10, and a radiator 21 including a radiator 21a, a condenser 21b for air conditioning, and the like. It is formed of a resin material having a rectangular frame portion 4a supported around.

Further, as shown in FIG. 1, a rectangular reinforced plastic fan shroud 23 having a cooling fan 22 provided substantially in the center in a front view is attached to a front position of the frame portion 4 a of the shroud 4. The fan shroud 23 is installed so as to cover the entire area of the front surface of the radiator 21a in order to increase the amount of air passing through the core portion of the radiator 21a due to the blowing of the cooling fan 22.
The cooling fan 22 is not limited to being provided on the front side (upstream side) of the radiator 21 as described above, but may be provided on the rear side (downstream side).

  The cooling fan 22 also has a function of blowing air (fan wind) to the engine 1. For example, in order to increase the amount of traveling wind flowing from the front grille 2 to the front of the vehicle body during vehicle traveling such as low speed traveling, When the vehicle is stopped, fan air is blown to the engine 1.

  In particular, since the inside of the cover member 30 described later covers the engine 1 with the cover member 30, the heat released from the exhaust system main parts 18 and 19 (exhaust manifold 18 and exhaust purification device 19) is easily generated. For this reason, for example, when the traveling wind cannot be taken into the engine 1 side from the front of the vehicle because the engine 1 stops immediately after the engine 1 generates high temperature due to high load operation, the exhaust system main parts 18 and 19 (exhaust manifold) 18 and the exhaust gas purification device 19) are concerned that the temperature of the atmosphere inside the cover member 30 becomes extremely high to the extent that heat damage is caused to the internal machine parts provided in the cover member 30. Therefore, in the present embodiment, the cooling fan 22 is operated for a predetermined time when the engine 1 is stopped immediately after the high load operation based on a command from an ECU (not shown).

  Although not shown in the figure, the ECU, for example, the amount of fuel injection during travel before stopping, the amount of depression of the accelerator pedal, the opening of the throttle valve, the number of revolutions of the engine 1, the engine water temperature, and the exhaust system parts around the stop. Based on at least one detected value of temperature or the like, it is determined whether or not the operation immediately before stopping is a high load operation, and the ON / OFF of the cooling fan 22 and the operation time are controlled based on the determination result. .

Next, the heat insulation structure of the engine 1 will be described in detail.
As shown in FIG. 1, a cover member 30 that covers the upper surface and the surrounding side surface of the engine 1 is provided below the bonnet 28.

As shown in FIGS. 1 to 5, the cover member 30 includes an upper lid portion 31 (see FIGS. 1 and 3) that covers the upper surface of the engine 1 so as to be openable and closable, and a right side wall portion 32 that covers the left and right sides of the engine 1. (Refer FIG. 2, FIG. 4), and it is comprised by the left side wall part 33 (refer the same figure) and the rear wall part 34 (refer FIGS. 1-5) which covers the back of the engine 1. FIG.
The upper lid portion 31, the left and right side wall portions 32, 33, and the rear wall portion 34 are all made of synthetic resin covers 31A, 32A, 33A, 34A as outer skins, and inner surfaces of the covers 31A, 32A, 33A, 34A. And heat insulating / sound absorbing materials 31B, 32B, 33B, 34B made of glass wool material, urethane material, or the like.

  Specifically, as shown in FIGS. 1, 3, and 4, the upper lid portion 31 includes a resin cover 31 </ b> A and a heat insulating / sound absorbing material 31 </ b> B integrally disposed on the inner surface of the cover 31 </ b> A.

Similarly, as shown in FIG. 4, the right wall portion 32 includes a resin cover 32A and a heat insulating / sound absorbing material 32B integrally disposed on the inner surface of the cover 32A.
Similarly, as shown in FIG. 4, the left side wall portion 33 includes a resin cover 33A and a heat insulating / sound absorbing material 33B integrally disposed on the inner surface of the cover 33A.
Similarly, as shown in FIGS. 3, 5, and 7, the rear wall portion 34 includes a resin cover 34 </ b> A and a heat retaining / sound absorbing material 34 </ b> B integrally disposed on the inner surface of the cover 34 </ b> A.

  The upper lid part 31, the left and right side wall parts 32 and 33, and the rear wall part 34 are all arranged with a gap between them and the engine 1, but in order to enhance the heat insulation effect by covering the engine 1 from the outside. In addition, the engine 1 is disposed with a small gap as small as possible.

  Further, the upper lid portion 31 is pivotally mounted so as to be openable and closable via a pair of left and right hinges 24 (see FIG. 3) extending rearward from the upper end of the rear wall portion 34 with an interval in the vehicle width direction (see FIG. 3). (See FIGS. 4 and 7). A seal member 25 is interposed between the outer peripheral edge of the upper lid portion 31 and the right and left side wall portions 32, 33 and the rear wall portion 34, and the upper lid portion 31 is inserted into the right and left sides via the seal member 25. It is elastically supported with respect to the side walls 32, 33, the rear wall 34, and the like.

  As shown in FIGS. 1, 4, and 7, the cover 31A of the upper lid portion 31 is integrally formed by a top plate portion 31a and a flange portion 31b extending substantially horizontally from the front, rear, left and right of the top plate portion 31a. Yes.

  Further, the top plate portion 31a has a central portion in plan view extending substantially horizontally in the vehicle front-rear direction and the vehicle width direction, and an outer peripheral portion is inclined downward toward the outer side in plan view and extends in a skirt shape. They are integrally formed (see FIGS. 1 and 4).

  The above-described sheet-shaped heat insulating / sound absorbing material 31B provided in the upper lid portion 31 is attached to substantially the entire lower surface of the top plate portion 31a with a fastener C or the like (see FIG. 3).

  The front portion of the upper lid portion 31 (the front portion of the top plate portion 31a) extends forward from the front end of the intake system 14 of the engine 1 (see FIG. 1), and extends further forward from the front end of the top plate portion 31a. The flange portion 31 b is placed on the upper surface of the shroud 4.

  Thus, the upper lid portion 31 covers not only the engine 1 but also the space Zf between the engine 1 and the shroud 4 from above (see the same figure).

  As shown in FIGS. 3 and 4, the heat retaining / sound absorbing material 31 </ b> B provided on the lower surface (inner surface) of the top plate portion 31 a of the upper lid portion 31 has a portion that coincides with the exhaust system main parts 18 and 19 in the vehicle width direction. It is formed thinner than other parts in the vehicle width direction.

  The thin portion 41 formed by thinning a part of the upper lid portion 31 in the vehicle width direction is continuously provided in the vehicle longitudinal direction from the front end to the rear end of the heat insulating / sound absorbing material 31B provided on substantially the entire inner surface of the top plate portion 31a. It is formed in a straight line (see FIG. 3).

  In this way, by forming the thin portion 41 on the heat insulating / sound absorbing material 31B provided in the upper lid portion 31 (see FIGS. 3, 4, and 7), the thin lid portion 41 corresponds to the thin portion 41 in the vehicle width direction of the upper lid portion 31. A concave portion 42 is formed along the vehicle front-rear direction. As shown in FIGS. 3 and 4, the recess 42 includes at least an exhaust system including a lower surface 41 a of the thin portion 41 and left and right side wall surfaces 41 b and 41 c extending downward from both ends of the lower surface 41 a in the vehicle width direction. The main parts 18 and 19 are formed to have a width equal to or slightly smaller than the width of the main parts 18 and 19.

  Furthermore, in this example, the recess 42 coincides with the cylinder head cover 11c of the engine main body 11 as well as the cylinder head cover 11c of the engine main body 11 in the heat retaining / sound absorbing material 31B provided in the upper lid 31. It is formed in a site (see FIGS. 1 and 7).

  In this way, by forming the concave portion 42 recessed upward on the lower surface of the upper lid portion 31, the upper lid portion 31 compares the portion corresponding to the concave portion 42 in the vehicle width direction with other portions in the vehicle width direction. And it forms so that the space | interval with the engine 1 may become large over the vehicle front-back direction (refer the same figure).

  The engine 1 in the space corresponding to the recess 42 in the vehicle width direction of the upper lid portion 31, that is, the space in which the vertical distance between the upper lid portion 31 and the engine 1 in the vehicle width direction becomes wider along the vehicle longitudinal direction. A space between the two is formed as an upper ventilation path Zuc.

  As shown in FIG. 1, the upper ventilation path Zuc extends along the vehicle front-rear direction in the upper layer portion Zu of the engine 1, and the front is a space Zf ahead of the engine 1 (a space between the engine 1 and the shroud 4). Zf) communicates with the space behind the engine body 11 (the space between the engine 1 and the rear wall 34 (that is, a rear ventilation path Zbc described later)).

Further, as shown in FIGS. 1, 3, 4, 7, and 8, a second cover 50 that covers the cylinder head cover 11 c of the engine body 11 from above is provided below the upper lid portion 31.
In addition, illustration of the cover member 30 is abbreviate | omitted in FIG.

  As shown in FIGS. 1, 3, and 4, the second cover 50 is equivalent to the width of the concave portion 42 in a portion corresponding to the concave portion 42 (thin portion 41) in the vehicle width direction of the upper lid portion 31. It is arranged with a width. As shown in FIG. 7, the second cover 50 is disposed between the upper lid portion 31 and the cylinder head cover 11c so that an upper ventilation path Zuc is formed between the second cover 50 and the upper lid portion 31 provided above the second cover 50. Yes.

  The second cover 50 is integrally formed of a skin plate 51 having a heat shielding function and a heat insulating / sound absorbing material 52 fixed to substantially the entire lower surface of the skin plate 51 (the surface facing the engine body 11). Has been. As the skin plate 51, for example, a resin can be used, and as the heat insulating / sound absorbing material 52, for example, artificial ore fibers such as glass wool and rock wool can be used.

  The second cover 50 includes a front cover portion 50a that covers the front side of the upper portion of the engine main body portion 11 substantially horizontally in the vehicle front-rear direction, and a rear side that extends from the rear end of the front cover portion 50a so as to be inclined in the front upper rear lower direction. The cover portion 50b is integrally formed. The second cover 50 is attached and supported on the upper surface so as to cover the cylinder head cover 11c from above.

  Then, by absorbing the combustion sound of the engine 1 transmitted through the cylinder head cover 11c and transmitted upward by the second cover 50, the sound absorbing function by forming the thin portion 41 in the heat retaining / sound absorbing material 31B provided in the upper lid portion 31. To compensate for the decline. Further, illustration of the engine main body 11 provided in the engine main body 11 is omitted due to heat flowing back along the ventilation paths Zuc, Zbc (upper ventilation path Zuc and rear ventilation path Zbc, which will be described later) due to hot air rising from the exhaust system main parts 18, 19. However, heat is shielded by the second cover 50 interposed between the ventilation paths Zuc, Zbc and the engine 1 so as not to cause heat damage to the engine parts such as the injector coupler and the gasket of the cylinder head 11b.

  As shown in FIGS. 2, 3, and 7, the rear wall portion 34 includes a rear wall rear surface portion 34 a disposed at the rear of the engine 1, and left and right left and right portions disposed on the left and right sides of the engine 1. The rear wall side portions 34b and 34b (see FIGS. 2 and 3) on the side are integrally formed. Further, as shown in FIG. 7, the rear wall rear surface portion 34 a includes a rear wall rear surface upper portion 34 u extending in the front upper rear lower shape at the rear of the engine 1, and a rear wall extending substantially vertically downward from the lower end of the rear wall rear surface upper portion 34 u. It is integrally formed with the rear lower surface 34d.

  As shown in FIG. 2, the left and right rear wall side portions 34b, 34b form a space Zb between the engine 1 and the rear wall rear surface portion 34a (hereinafter referred to as “cover inner engine rear space Zb”) on the left and right sides. It is arranged to close from. As shown in FIGS. 5 and 7, the rear wall portion 34 is an abbreviation of the exhaust manifold 18 above the exhaust system main parts 18, 19 extending rearward of the vehicle corresponding to the exhaust ports of the engine body 11. The whole and at least the three-way catalyst 19a of the exhaust emission control device 19 are covered from above. Thus, the hot air released from the exhaust system main parts 18 and 19 and rising is taken into the inside of the cover member 30, that is, into the cover inner engine rear space Zb without leaking outward from the rear wall portion 34.

  In this embodiment, as shown in FIGS. 1 and 7, wiring and piping (not shown) arranged between the second cover 50 and the cylinder head cover 11 c and on the upper surface of the cylinder head cover 11 c are arranged upward. The protector 100 which covers is provided. The protector 100 is made of steel to prevent the wiring and piping from being caught between the engine 1 and the cowl panel 6 (see FIG. 1) of the vehicle body and being damaged when the engine 1 is retracted at the time of a front collision. It is. The second cover 50 is attached to the protector 100 with a fastener F or the like.

As shown in FIGS. 5 and 7 to 9, an upper portion of the exhaust manifold 18 on the rear side of the engine 1, specifically, a rear surface 11 bb from the cylinder head 11 b to the cylinder head cover 11 c in the engine main body 11, A rear insulator 54 is provided.
8 and 9 both show the power unit 10 with the cover member 30 removed.

  The rear insulator 54 is integrally formed of a skin plate 55 having a heat shielding function and a heat insulating / sound absorbing material 56 fixed to substantially the entire front surface of the skin plate 55 (the surface facing the engine body 11). Has been. As the skin plate 55, for example, an aluminum plate or a steel plate can be used, and as the heat insulating / sound absorbing material 56, artificial ore fibers such as glass wool or rock wool can be used.

  Further, the rear insulator 54 is formed with a thin central portion in the vehicle width direction with respect to the left and right sides. Thereby, the rear surface of the rear insulator 54 is formed with a vertical wall surface 54a extending continuously in the vertical direction and the vehicle width direction at the center in the vehicle width direction, and on the left and right sides with respect to the vertical wall surface 54a. Projections 54b projecting rearward and continuously extending in the vertical direction are formed.

  By forming the vertical wall surface 54a extending in the vertical direction on the rear surface of the rear insulator 54, the heat released from the exhaust system main components 18 and 19 can be smoothly raised along the vertical wall surface 54a. Further, the pair of left and right protrusions 54b function as an air guide that guides the hot air from the exhaust system main parts 18 and 19 so as not to diffuse outward in the vehicle width direction when the hot air rises along the vertical wall surface 54a. be able to.

  The second cover 50 and the rear insulator 54 are smoothly connected in the vertical direction so that no step is formed between the lower end of the rear surface of the second cover 50 and the upper end of the rear surface of the rear insulator 54. .

  In this way, by providing the rear insulator 54 on the rear surface 11bb from the cylinder head 11b to the cylinder head cover 11c, for example, the above-described engine provided in the cylinder head 11b due to the rise of hot air from the exhaust system main parts 18 and 19 While being able to prevent heat damage to components, the combustion sound of the engine 1 propagating backward from the inside of the engine 1 can be absorbed.

  Incidentally, as shown in FIG. 5, the cover inner engine rear space Zb is configured across the entire vehicle width direction of the engine 1 behind the engine 1 inside the cover member 30. In Zb, a portion immediately above the exhaust system main components 18 and 19 (portion positioned above the exhaust system main components 18 and 19 in the vehicle width direction) is formed as a rear side ventilation path Zbc extending in the vertical direction. (See FIGS. 5 and 7). The rear ventilation path Zbc corresponds to a space between the rear insulator 54 provided on the rear surface of the cylinder block 11a and the rear wall rear surface portion 34a.

  Further, as shown in FIGS. 1 and 7, the rear ventilation path Zbc extends in the vehicle front-rear direction in the gap between the upper lid portion 31 and the engine 1 inside the cover member 30, that is, the engine upper layer portion Zu. The upper side of the rear side air passage Zbc communicates with the rear portion of the rear side air passage Zbc extending in the vehicle front-rear direction inside the cover member 30. .

  It should be noted that the heat retaining / sound absorbing material 34B provided on the rear wall portion 34 of the cover member 30 does not have a turbulent flow of air flowing through the ventilation paths Zuc, Zbc on the inner surface (the surface facing the ventilation paths Zuc, Zbc). In addition, convex portions or the like protruding locally toward the ventilation paths Zuc and Zbc are formed as smoothly as possible (see FIG. 7).

  2, 3, and 5, the rear wall rear surface portion 34 a has a substantially intermediate position (a portion corresponding to the exhaust system main parts 18 and 19) and one end (in this example) in the vehicle width direction. A portion between the left end side and the right rear wall side portion 34b is formed to extend substantially horizontally (parallel to the vehicle width direction) along the vehicle width direction.

  That is, as shown in FIG. 5, in the cover inner engine rear space Zb, the space Zbl on the one side (left side) in the vehicle width direction with respect to the rear ventilation passage Zbc is approximately the same area as the rear ventilation passage Zbc. (Space in the vehicle front-rear direction) is formed.

  In the present embodiment, exhaust-related parts 91 such as EGR system parts are collectively arranged in the space Zbl on the left side of the rear-side ventilation path Zbc in the cover inner engine rear space Zb.

  Thus, by increasing the occupation ratio of the exhaust-related components 91 in the left space Zbl with respect to the rear ventilation path Zbc, the left space Zbl is a substantially narrow space compared to the rear ventilation path Zbc. (Substantially narrow space Zbl).

  Here, the substantially narrow space Zbl is an air that is not occupied by the exhaust-related parts group 91 in a space in a predetermined region other than the rear ventilation path Zbc in the vehicle width direction of the cover inner engine rear space Zb. The hollow space filled with is a narrow space as compared with the rear side ventilation path Zbc.

  That is, in this example, the space Zbl on the left side of the cover inner engine rear space Zb with respect to the rear ventilation path Zbc is substantially (apparently) substantially the same area as the rear ventilation path Zbc (the engine 1 and the rear wall). (See FIG. 5), as described above, by configuring the left space Zbl as a substantially narrow space Zbl, it is emitted from the exhaust system main parts 18, 19, The hot air rising along the rear ventilation path Zbc is difficult to enter the substantially narrow space Zbl on the left side.

  On the other hand, as shown in FIGS. 3 and 5, the rear wall rear surface portion 34 a is located on the other side (the right side in this example) with respect to the substantially intermediate position (the portion corresponding to the exhaust system main parts 18 and 19) in the vehicle width direction. ) Is formed with an inclined surface portion 34c that is inclined in plan view so as to be gradually positioned forward in the vehicle width direction outer side, and as a result, as shown in FIG. The space is gradually narrowed toward the outside in the vehicle width direction.

  Thereby, in the cover inner engine rear space Zb, the space Zbr on the other side (right side) with respect to the rear ventilation path Zbc is formed narrower than the rear ventilation path Zbc.

  By configuring the space Zbr on the right side with respect to the rear ventilation path Zbc in this manner as a substantially narrow space Zbr that is substantially narrower (physically narrower) than the rear ventilation path Zbc, the exhaust system main components The heat that is released from 18, 19 and rises along the rear ventilation path Zbc is difficult to reach the practically narrow space Zbr on the right side of the rear ventilation path Zbc.

  Further, in this embodiment, in the cover inner engine rear space Zb, the internal machine component 92 having a low heat resistance temperature (a component having a low heat resistance temperature inside the cover member 30 and an engine component such as an electronic component such as a sensor or a harness). Or the engine-related parts (hereinafter referred to as “low heat-resistant parts 92”) without disposing as much as possible in the rear ventilation passage Zbc corresponding to the exhaust system main parts 18 and 19 as much as possible. 19 is arranged so as to be aggregated into a substantially narrow space Zbl offset to the left side with respect to the rear ventilation path Zbc, which is not directly above 19, and a substantially narrow space Zbr offset to the right side.

  Specifically, as shown in FIGS. 8 and 9, an EGR differential pressure sensor connector as an example of the exhaust-related component 91 or the low heat-resistant component 92 is provided in the substantially narrow space Zbl on the left side of the cover inner engine rear space Zb. 92a (see FIG. 9), purge hose 92b, exhaust side VVT connector and coupler 92c, fuel hose 92d (see FIG. 8), RrO2 sensor connector and coupler 92e (see FIG. 9), exhaust side cam sensor and coupler 92f (see FIG. 9) 9), a hose 92g of a GFP differential pressure sensor, a pressure sensor 92s, and the like are provided.

  In addition, by arranging the low heat resistant component 92 in the space Zbl on the left side with respect to the rear ventilation path Zbc in the cover inner engine rear space Zb, the influence of the hot air rise of the exhaust system main components 18 and 19 is directly affected. In addition to avoiding receiving, it is possible to increase the component occupation ratio of the left space Zbl as a substantially narrow space, and as a result, it is difficult for heat to enter the left space Zbl from the rear ventilation path Zbc. Can also contribute. For this reason, the exhaust related components 91 concentrated in the left space Zbl so as to form a substantially narrow space Zbl are not limited to components different from the low heat resistant component 92 but may be the same components.

  On the other hand, as shown in FIGS. 8 and 9, a crank angle sensor 92 i (see FIG. 8), a water flow ON-OFF, as an example of the low heat-resistant component 92, is provided in the substantially narrow space Zbr on the right side of the cover inner engine rear space Zb. A valve 92j (see FIG. 8), a water hose 92k, a FrO2 connector 92o, and the like are provided.

  Further, as shown in FIG. 9, also in the engine upper layer portion Zu, the influence of heat damage due to heat rising from the exhaust system main parts 18 and 19 and circulating to the front of the engine 1 along the upper ventilation path Zuc is considered. Thus, the low heat-resistant component 92 is arranged as offset to the left and right with respect to the upper ventilation path Zuc without being arranged in the upper ventilation path Zuc as much as possible.

  Specifically, as shown in FIG. 9, an injector cam sensor coupler 92 n, a cylinder pressure sensor connector 92 l, a fuel hose 92 d (FIG. 8, FIG. 8) are disposed in the region offset to the left side with respect to the upper ventilation path Zuc of the engine upper layer portion Zu. 9) and an injection connector 92m and the like.

  On the other hand, as shown in FIG. 9, an injector connector 92p, an IG coil connector and coupler 92q, a temperature sensor connector and coupler 92r, and the like are provided in a region offset to the right with respect to the upper ventilation path Zuc of the engine upper layer portion Zu. .

  In this way, in the cover inner engine rear space Zb and the engine upper layer portion Zu inside the cover member 30, safety zones for heat are formed on both sides with respect to the ventilation paths Zuc and Zbc (see FIG. 9). By disposing the low heat-resistant component 92 in the safety zone configured so as to avoid Zuc and Zbc, hot air rises from the exhaust system main components 18 and 19 (forward with respect to the engine 1 along the ventilation paths Zuc and Zb). Of the heat flowing into the exhaust system main parts 18 and 19 is effectively diffused into the narrow space Zbr and the substantially narrow space Zbl, and the influence of the heat damage on the low heat-resistant component 92 due to the filling is reduced. Can be prevented.

  Further, the low heat resistant component 92 does not become a resistance of the scavenging air (traveling air, fan air) flowing from the front of the engine 1 toward the exhaust system main components 18 and 19 along the ventilation paths Zuc and Zbc. The air that is discharged from the exhaust system main parts 18 and 19 by the air and flows backward (up hot air) along the ventilation paths Zuc and Zbc can be efficiently scavenged.

  As shown in FIGS. 1, 2, 6 (a), 6 (b), and 9, a front insulator 60 is provided on the front side of an intake system component as an engine component on the front side of the engine 1.

  Specifically, as shown in FIG. 1, the front insulator 60 includes an intake duct 16c that connects a supercharger 16a (mechanical in this example) included in a turbocharger system 16 that forms part of the intake system 14 and an intercooler 16b. Attached to the front.

  The front insulator 60 corresponds to the shape of the intake duct extending in the vertical direction, and extends in the vertical direction from the lower side to the upper end of the engine 1 on the front side of the engine 1, and in the vehicle width direction of the internal space of the cover member 30. Are provided at positions that coincide with the ventilation paths Zuc, Zbc (in other words, the exhaust system main parts 18, 19) with at least the width of the ventilation paths Zuc, Zbc (see FIG. 9).

  The front insulator 60 is formed in a plate shape having a predetermined thickness in the vehicle front-rear direction by a heat insulating / sound absorbing material 61 made of, for example, glass wool material or urethane material. The front insulator 60 located on the front side of the engine 1 is configured without a skin plate so as not to impair the impact absorbing performance at the time of a vehicle front collision.

  As shown in FIGS. 6 (a) and 6 (b), the front insulator 60 is formed on the front side of the front insulator 60 by forming the center in the vehicle width direction thinner than the left and right sides. A flat vertical wall surface 60a extending continuously in the vertical direction and the vehicle width direction is formed at the center in the width direction, and as shown in FIG. 6B, on the left and right sides of the vertical wall surface 60a, A protrusion 60b is formed as an air guide that protrudes toward and extends continuously in the vertical direction.

  Further, as shown in FIG. 6 (a), the upper portion of the vertical wall surface 60a of the front insulator 60 is formed with an inclined surface 60c that is gently inclined (in this example, in an R shape) so as to be located rearward as it extends upward. The inclined surface 60c is formed continuously in the vertical direction with the main part of the vertical wall surface 60a extending vertically in the vertical direction at the lower part.

  On the other hand, an air inlet Zuf (opening) located at the front end of the upper ventilation path Zuc is formed between the upper part of the front insulator 60 and the upper lid part 31 facing the upper part upward.

  The air introduction port Zuf has a vertical opening shape in which an opening (space in the vertical direction) gradually widens forward as the inclined surface 60c is formed on the upper portion of the vertical wall surface 60a as described above. The hot air rising along the wall surface 60a is easily taken into the upper ventilation path Zuc (see FIG. 6A).

Next, the flow of scavenging air inside the cover member 30 will be briefly described.
The scavenging air that has passed through the front grille 2 and the shroud 4 from the front of the vehicle due to the vehicle running or the cooling fan 22 is the space Zf in front of the engine 1 in the cover member 30 (between the shroud 4 and the engine 1). (See FIG. 1), a part of which flows upward along the vertical wall surface 60a formed on the front surface of the front insulator 60, and smoothly flows from the air inlet Zuf along the inclined surface 60c. It is taken into the upper ventilation path Zuc.

  The scavenging air (running air, fan air) that flows rearward of the engine 1 along the upper ventilation path Zuc in the engine upper layer part Zu collides with the rear wall part 34 to communicate with the upper ventilation path Zuc. And flows toward the lower exhaust system main parts 18 and 19 along the rear ventilation path Zbc. As a result, the heat generated by the hot air from the exhaust system main parts 18 and 19 can be efficiently scavenged by the scavenging air.

  Here, in the present embodiment, the ventilation paths Zuc, Zbc (the upper ventilation path Zuc and the rear ventilation path Zbc) are provided at positions that coincide with the exhaust system main parts 18, 19 in the vehicle width direction, and the exhaust system main parts. Similarly to the 18 and 19 and the tunnel portion 8, the vehicle body (power unit 10) is provided so as to be positioned at the center in the vehicle width direction. For this reason, the scavenging air that has absorbed the heat of the exhaust system main parts 18 and 19 flows into the interior of the rear tunnel portion 8 at the shortest distance and is discharged outside the vehicle.

  As described above, the front structure V of the present embodiment is a vehicle front structure including the cover member 30 that covers the upper surface and the surrounding side surface of the engine 1 below the bonnet 28, and the upper wall of the cover member 30. A space between the engine 1 and the rear wall of the cover member 30 is formed with respect to at least a portion (upper ventilation path Zuc) in the vehicle width direction of at least the front part of the (front cover part 31) in the vehicle front-rear direction. The space (rear side ventilation path Zbc) located above the exhaust system main parts 18 and 19 (exhaust manifold 18 and exhaust purification device 19) in the vehicle width direction of the (rear wall portion 34) is the space between the engine 1 and Is formed wider than other parts (spaces Zbl and Zbr on the left and right sides with respect to the rear side ventilation path Zbc) (particularly FIG. 1, FIG. 3, FIG. 5, FIG. 7, FIG. 8 and FIG. 10). 1, see FIG.

  As described above, by forming a space between the upper lid portion 31 of the cover member 30 and a part of the engine 1 in the vehicle width direction wider than other portions, a scavenging airflow (from the vehicle front side toward the engine 1) Scavenging air) is actively taken into the cover member 30 from a portion (the air introduction port Zuf of the upper ventilation path Zuc) in the front portion of the upper lid portion 31 of the cover member 30 where the space with the engine 1 is widely formed. Thus, in the engine upper layer portion Zu inside the cover member 30, it can flow backward.

  On the other hand, the space (rear side ventilation path Zbc) between the cover 1 and the engine 1 in the vehicle width direction of the rear wall portion 34 of the cover member 30 in the vehicle width direction is different from that of the other portions. By forming it widely, the scavenging air can be efficiently flowed toward the exhaust system main parts 18 and 19 from above.

  Therefore, by covering the engine 1 with the cover member 30, the heat retaining property inside the cover member 30 is improved, the fuel consumption is improved by the early warm-up when the engine 1 is restarted, and the inside of the cover member 30 is changed depending on the driving state of the vehicle. Even when the temperature of the exhaust system increases, as described above, the scavenging air can flow toward the exhaust system main parts 18 and 19 to efficiently scavenge the hot air discharged from the exhaust system main parts 18 and 19. Further, it is possible to prevent heat damage such as electronic components and wiring inside the cover member 30.

  As an aspect of the present invention, the cooling fan 22 (see FIG. 1) is operated for a predetermined period when the engine 1 is stopped immediately after the high load operation.

  According to the above configuration, hot air can be surely scavenged by the fan wind even when the engine 1 is stopped.

  As an aspect of the present invention, a sound absorbing material (heat insulating / sound absorbing material 31B) is provided on at least the inner wall surface of the cover 31A of the upper lid portion 31 of the cover member 30, and the exhaust system main components 18 and 19 in the upper lid portion 31 are provided. And a thin wall portion 41 in which the heat insulating / sound-absorbing material 31B in a portion that coincides with the vehicle width direction is made thinner than other portions (see FIGS. 3 and 4), and a central portion in the vehicle width direction is provided below the upper lid portion 31. The second cover 50 that covers the cylinder head 11b from above is provided, and a sound absorbing material (thermal insulation / sound absorbing material 52) is provided on the inner wall surface of the second cover 50 (FIGS. 1, 3, 4, and 5). 7, see FIG.

  According to the above configuration, the upper ventilation path Zuc, which is located in the engine upper layer part Zu and is covered with the cover member 30, is formed in the upper lid part 31 at a portion that coincides with the exhaust system main parts 18 and 19 in the vehicle width direction. (See FIG. 9), the scavenging air (running air, fan air) taken from the front of the engine 1 into the upper ventilation path Zuc can be made to flow more efficiently toward the exhaust system main parts 18 and 19. Further, it is possible to prevent the atmosphere inside the cover member 30 from being excessively heated due to heat radiation from the exhaust system main parts 18 and 19.

  Furthermore, according to the above configuration, the upper ventilation path Zuc can be formed in the engine upper layer part Zu without affecting the outer shape line of the upper cover part 31 (particularly the cover 31A) of the cover member 30, and the cover 31A of the upper cover part 31 can be formed. The second cover 50 can also prevent the sound insulation performance from being lowered due to the formation of the thin portion 41 on the heat insulating / sound absorbing material 31B.

  As an aspect of the present invention, a flat vertical wall surface 60a continuous in the vertical direction is formed on the front side of the intake system component (intake duct 16c) on the front side of the engine 1 (FIGS. 1, 2, and FIG. 6 (a) (b), see FIG. 9).

  According to the above configuration, the scavenging air flowing from the front toward the engine 1 is raised along the vertical wall surface 60a and scavenged from the air introduction port Zuf at the front end of the upper ventilation path Zuc located in the engine upper layer portion Zu. Air can be taken in smoothly from the upper ventilation path Zuc.

  As an aspect of the present invention, protrusions 60b that protrude forward with respect to the vertical wall surface 60a and that extend continuously in the vertical direction are provided on both sides of the vertical wall surface 60a (FIGS. 2 and 6). b), see FIG.

  According to the above configuration, the scavenging air that rises along the vertical wall surface 60a toward the air introduction port Zuf at the front end of the upper ventilation path Zuc is guided by the protrusions 60b from both outer sides in the vehicle width direction, thereby the scavenging air. However, the scavenging air can be smoothly guided to the air introduction port Zuf without leaking laterally outward in the vehicle width direction with respect to the vertical wall surface 60a.

  Further, as an aspect of the present invention, in the vehicle width direction of the rear wall portion 34 of the cover member 30, a portion that is not located above the exhaust system main parts 18, 19 (the substantially narrow space Zbr on the right side with respect to the rear ventilation path Zbc). ), The distance between the rear portion of the engine 1 and the rear wall portion 34 is formed to be narrower than other portions (rear side ventilation passage Zbc) in the vehicle width direction (see FIG. 5).

  According to the above configuration, it is possible to promote the rise of hot air from the exhaust system main parts 18 and 19, and due to the rise of hot air of internal machine parts (electronic parts and wiring provided inside the cover member 30) around the rear of the engine 1. It is easy to avoid the influence of heat damage, and it becomes easy to scavenge the heat that rises due to the rising of hot air with scavenging air.

  Further, as an aspect of the present invention, in the vehicle width direction of the rear wall portion 34 of the cover member 30, a portion that is not located above the exhaust system main parts 18, 19 (substantially narrow space Zbl on the left side with respect to the rear ventilation path Zbc). ), The internal machine parts such as the exhaust-related parts 91 are arranged more centrally than the parts (rear side ventilation paths Zbc) located above the exhaust system main parts 18 and 19, so that the left side space Zbl Is formed by narrowing a substantial gap between the rear portion of the engine 1 and the rear wall portion 34 with respect to a portion (rear side ventilation passage Zbc) located above the exhaust system main parts 18 and 19.

  According to the above configuration, the layout is such that the exhaust-related parts 91 are concentrated and disposed in the substantially narrow space Zbl, so that a substantial distance between the rear portion of the engine 1 and the rear wall portion 34 in the space Zbl. By narrowing (space), it is possible to promote the rise of hot air from the exhaust system main parts 18 and 19 in the portion (rear side ventilation path Zbc) located above the exhaust system main parts 18 and 19 (that is, It is possible to prevent the heat rising due to hot air from spreading in the vehicle width direction).

  Thereby, it is possible to prevent the exhaust related component 91 from being directly exposed to the heat generated by the hot air from the exhaust system main components 18 and 19, and to protect the exhaust related component 91 against heat.

  Furthermore, by adopting a layout in which the exhaust-related parts 91 are arranged in a substantially narrow space Zbl that is not located above the exhaust system main parts 18 and 19, the exhaust system main parts of the scavenging air along the rear side ventilation path Zbc. The flow toward 18 and 19 can be secured, and the heat generated by the hot air from the exhaust system main parts 18 and 19 can be efficiently scavenged to the tunnel portion 8 side by the scavenging air.

  Further, as an aspect of the present invention, the exhaust system is mainly disposed in a portion where the distance from the rear portion of the engine 1 in the vehicle width direction of the rear wall portion 34 of the cover member 30 is narrow (effectively a narrow space Zbr and a substantially narrow space Zbl). The low heat-resistant parts 92 are gathered and arranged rather than the part (rear side ventilation path Zbc) located in the upper part of the parts 18 and 19 (see FIGS. 5, 8, and 9).

  According to the above configuration, it is possible to achieve both the scavenging of hot air by the scavenging air (running air, fan air) and the protection of the low heat resistant component 92 against the return of hot air when the vehicle is stopped.

  As an aspect of the present invention, a heat insulating / sound insulating material (rear insulator 54) is attached to the rear portion of the engine 1 (the rear surface 11bb from the cylinder head 11b to the cylinder head cover 11c in the engine main body 11) (FIGS. 1 and 5, refer to FIG. 7 to FIG. 9), and the portion located above the exhaust system main parts 18 and 19 in the vehicle width direction of the rear insulator 54 is formed thinner than the other portions (FIGS. 5 and 5). 8, see FIG.

  According to the above-described configuration, the exhaust system main component is added to the relatively low heat resistant rubber or resin engine component provided in the engine 1 by the rear insulator 54 attached to the rear surface 11bb from the cylinder head 11b to the cylinder head cover 11c. It is possible to prevent the influence of heat damage due to the rising heat from 18,19.

  Further, the combustion noise of the engine 1 that tends to propagate to the rear of the engine 1 can be contained by the rear insulator 54 attached to the rear surface 11bb from the cylinder head 11b to the cylinder head cover 11c.

  In addition, in the vehicle width direction of the rear insulator 54, the central portion in the vehicle width direction (portion located above the exhaust system main parts 18 and 19) is formed thinner than both sides (other portions), thereby The heat released from the main system parts 18 and 19 is likely to rise while being guided by the projections 54b on both sides along the rear surface (vertical wall surface 54a) of the thinly formed portion. , 19 can promote the rising of hot air along the rear ventilation path Zbc.

  Thereby, it is possible to prevent heat damage from being applied to the low heat resistant component 92 disposed around the exhaust system main components 18 and 19.

The present invention is not limited to the configuration of the above-described embodiment, and can be formed in various embodiments.
For example, the thin-walled portion 41 (recess 42) formed on the lower surface of the upper lid portion 31 may be formed with a width equal to or greater than the vehicle width direction of the exhaust system main parts 18 and 19, as described above. Preferably, the thin wall portion of the present invention is formed to have a width corresponding to at least the second and third ports on the center side in the vehicle width direction among the first to fourth ports provided in the exhaust manifold 18, for example. The exhaust system main parts 18, 19 include those formed so that at least a part of the width direction coincides with the width.

DESCRIPTION OF SYMBOLS 1 ... Engine 11 ... Engine main-body part 11bb ... Rear surface from a cylinder head to a cylinder head cover (Engine rear part of Claim 9)
16c ... Intake duct (intake system parts)
18 ... Exhaust manifold (exhaust manifold)
19 ... Exhaust air purification device 22 ... Cooling fan (fan)
28 ... Bonnet 30 ... Cover member 31 ... Upper lid (upper wall of cover member, cover member according to claim 3)
31B ... heat insulation / sound absorbing material (sound absorbing material (provided on the inner wall surface of the cover member))
34 ... rear wall (back wall of cover member)
41 ... Thin part (a part of the front wall of the cover member in the vehicle width direction)
50 ... second cover 52 ... heat insulation / sound absorbing material (sound absorbing material (provided on the inner wall surface of the second cover))
54 ... Rear insulator (heat insulation / sound insulation)
60a ... Vertical wall surface (the vertical wall surface according to claim 4)
60b ... projection (protrusion according to claim 5)
91 ... Exhaust related parts (internal machine parts)
92 ... Low heat resistant parts (internal machine parts with low heat resistant temperature)
Zuc: upper ventilation path (space between engine (in the vehicle width direction of the upper wall of the cover member) and the engine), a part Zbr located above the exhaust manifold and the exhaust purification device, right side space, practically narrow space ("A part not located on the upper part of the exhaust system main part" described in claim 6)
Zbl: space on the left side, substantially narrow space (“portion not located on the upper part of exhaust system main parts” according to claim 7)
Zbc ... rear side ventilation path (“other part in the vehicle width direction” according to claim 6, “part located on the upper part of exhaust system main parts” according to claim 7, 8)

Claims (9)

A front structure of a vehicle including a cover member that covers an upper surface and a peripheral side surface of the engine below the bonnet,
A part of the front wall of the upper part of the cover member in the vehicle width direction is formed so that a space between the engine and the engine is wider than other parts. A front structure of a vehicle in which a space between the engine and a portion located in the upper portion is formed wider than other portions. Operates the fan for a specified period when the engine stops immediately after high-load operation.
The vehicle front structure according to claim 1. A sound absorbing material is provided on the inner wall surface of the cover member,
The upper wall is provided with a second cover that covers the engine main body from above under the upper wall, while making the sound absorbing material at the portion matching the exhaust manifold and the exhaust purification device in the vehicle width direction thinner than other portions.
The vehicle front structure according to claim 1 or 2, wherein a sound absorbing material is provided on an inner wall surface of the second cover. The vehicle front structure according to claim 3, wherein a flat vertical wall surface continuous in the vertical direction is formed on a front surface side of an intake system component on the front side of the engine. The vehicle front structure according to claim 4, wherein protrusions projecting forward with respect to the vertical wall surface and extending continuously in the vertical direction are provided on both sides of the vertical wall surface. The space between the rear portion of the engine and the rear wall of the cover member is narrower than other portions in the vehicle width direction of the portion of the rear wall of the cover member that is not positioned above the exhaust manifold and the exhaust purification device in the vehicle width direction. The front part structure of the vehicle according to any one of 3 to 5. In the vehicle width direction of the rear wall of the cover member, with respect to the portion not located above the exhaust manifold and the exhaust purification device, by arranging the internal machine parts more collectively than the portion located above the exhaust system main parts, 7. The system according to claim 3, wherein a substantial gap between the rear portion of the engine and the rear wall of the cover member is formed narrower than the portion located above the exhaust manifold and the exhaust purification device. Vehicle front structure. In the vehicle width direction of the rear wall of the cover member, the region where the space between the rear portion of the engine and the cover member rear wall is formed narrower than the portion located above the exhaust manifold and the exhaust purification device. The front structure of a vehicle according to claim 6 or 7, wherein low internal machine parts are arranged in a concentrated manner. A heat insulation / sound insulation material is attached to the rear of the engine,
9. The vehicle front structure according to claim 8, wherein a portion of the heat insulating / sound insulating material positioned in the upper portion of the exhaust manifold and the exhaust purification device in the vehicle width direction is formed thinner than other portions.

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