WO2017126429A1

WO2017126429A1 - Heat shield structure for vehicle

Info

Publication number: WO2017126429A1
Application number: PCT/JP2017/001019
Authority: WO
Inventors: 義辰鈴木; 大野　浩一; 圭介湯浅; 和利伊藤; 晃嗣上條
Original assignee: いすゞ自動車株式会社
Priority date: 2016-01-22
Filing date: 2017-01-13
Publication date: 2017-07-27
Also published as: CN108473046A; PH12018501470A1; CN112918398A; CN108473046B; JP6668777B2; MY195015A; CN112918398B; JP2017128310A

Abstract

Provided is a heat shield structure for a vehicle having an engine 1, a transmission 3 which is disposed behind the engine in the vehicle length direction, and exhaust gas passage members 17, 18 which are arranged at a side of the engine in the vehicle width direction and through which exhaust gas flows. The heat shield structure is provided with a heat shield plate 31 which is located on the same side as the exhaust gas passage members in the vehicle width direction at a position between the transmission and the exhaust gas passage members in the vehicle length direction, and which guides air currents F1, F2 having been heated by the exhaust gas passage members and flowing rearward, the air currents F1, F2 being guided in the direction away from the transmission.

Description

Vehicle heat insulation structure

This disclosure relates to a vehicle heat shield structure.

As a prior art, a catalyst heat shield is provided between the functional component and the catalyst in order to suppress the temperature rise of the functional component mounted on the transmission (transmission) connected to the engine (internal combustion engine). A structure is known in which a functional part is routed over the floor tunnel part and a guide part for guiding the air flow toward the functional part of the floor tunnel part is provided on the catalyst heat shield (see, for example, Patent Document 1). ).

Japanese Unexamined Patent Publication No. 2011-131689

A vehicle having an engine, a transmission disposed behind the engine in the vehicle length direction, and an exhaust passage member disposed on the side of the engine in the vehicle width direction and through which exhaust gas flows is known. In this case, an air flow such as traveling wind that is heated by the exhaust passage member and flows backward is transmitted to the transmission, thereby increasing the surface temperature of the transmission, and thus excessively increasing the oil temperature of the transmission. There is.

The present disclosure provides a vehicle heat shield structure that can suppress an increase in the oil temperature of the transmission.

According to one aspect of the present disclosure,
An engine, a transmission disposed behind the engine in the vehicle length direction, and an exhaust passage member disposed on a side of the engine in the vehicle width direction and through which exhaust gas flows.
An air flow that is heated by the exhaust passage member and flows rearward is positioned at a position between the exhaust passage member and the transmission in the vehicle length direction and on the same side as the exhaust passage member in the vehicle width direction. A heat shield structure for a vehicle is provided that includes a heat shield plate that guides in a direction away from the machine.

The vehicle includes a side rail that is positioned on both sides in the vehicle width direction, and the engine, the transmission, and the exhaust passage member are disposed therebetween, and an engine that covers both side surfaces and a bottom surface of the engine below the side rail. A cover, and a transmission cover that covers both side surfaces and a bottom surface of the transmission below the side rail,
The heat shield plate guides an air flow that flows backward in a space surrounded by the side rail, the engine cover, and the transmission cover in a direction away from the transmission in front of the transmission. It may be configured to do.

The heat shield plate may include a first heat shield plate and a second heat shield plate disposed at a position lower than the first heat shield plate.

The first heat shield plate may be attached to a flywheel housing at a rear end portion of the engine, and the second heat shield plate may be attached to a clutch housing connected to a rear end portion of the flywheel housing. .

According to the present disclosure, an increase in the oil temperature of the transmission can be suppressed.

FIG. 1 is a right side view showing the configuration of the present embodiment. 2 is a cross-sectional view taken along the line II-II in FIG. 1 showing the configuration of the present embodiment. FIG. 3 is a perspective view showing the configuration of the present embodiment. FIG. 4 is a perspective view showing attachment portions of the first and second heat shield plates. FIG. 5 is a perspective view showing a mounting portion of the first heat shield plate. FIG. 6 is an exploded perspective view showing the configuration of the mounting portion of the first heat shield. FIG. 7 is a perspective view showing a mounting portion of the first heat shield plate in the first modification. FIG. 8 is a perspective view showing a state before the first heat shield plate is attached in the first modification. FIG. 9 is a perspective view showing attachment portions of the second and third heat shield plates in the first modification. FIG. 10 is a perspective view showing attachment portions of the first and third heat shield plates in the first modification. FIG. 11A and FIG. 11B are cross-sectional views of the first heat shield plate of the basic embodiment and the first heat shield plate of the second modification.

Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings.

FIG. 1 is a right side view showing a heat shield structure for a vehicle according to the present embodiment, FIG. 2 is a rear sectional view thereof, and FIG. 3 is a perspective view thereof. The front, rear, left, right, top, and bottom directions described here refer to the directions of the vehicle as illustrated.

In this embodiment, the vehicle is a cab over type truck. The vehicle has an engine (internal combustion engine) 1 as a power source and a transmission 3 connected to the engine 1 via a clutch 2. The engine 1, the clutch 2, and the transmission 3 are vertically installed on the vehicle, and are coaxially connected in order from the front in the vehicle length direction. Therefore, the transmission 3 is disposed behind the engine 1 in the vehicle length direction. The engine 1 is a diesel engine, and the transmission 3 is a manual transmission (including an automated one). However, the types of the vehicle, the engine 1 and the transmission 3 are not limited to the above.

The vehicle has a ladder frame 4 (omitted in FIG. 3). The frame 4 includes a pair of

side rails

5L and 5R that are positioned on both left and right sides in the vehicle width direction and extend in the vehicle length direction, and a plurality of cross members that extend in the vehicle width direction and connect the left and

right side rails

5L and 5R. FIG. 1 and FIG. 2 show one of the cross members, that is, the under cross member 6. As shown in FIG. 2, the undercross member 6 is formed in a substantially U shape in a rear view, and extends below the engine 1 in the vehicle width direction. As shown in FIG. 2, the

side rails

5L and 5R are made of grooved steel whose center in the vehicle width direction is open. The undercross member 6 is made of a steel material having a convex cross-sectional shape.

The engine 1, the clutch 2, and the transmission 3 are disposed between the left and

right side rails

5L and 5R, and are supported by the left and

right side rails

5L and 5R. The undercross member 6 is disposed at a position near the rear end of the engine 1 in the vehicle length direction.

The vehicle is under the

side rails

5L and 5R and in front of the under cross member 6 and covers the both sides and bottom of the engine 1, and under the

side rails

5L and 5R and behind the under cross member 6. A clutch cover 8 and a transmission cover 8 that covers both side surfaces and bottom surfaces of the transmission 3 are provided (not shown in FIG. 2). The engine cover 7 and the transmission cover 8 are sound insulation covers that insulate the noise generated by the engine 1 and the transmission 3 so as not to leak to the outside as much as possible, and thus comply with noise regulations.

The engine cover 7 and the transmission cover 8 are suspended and supported by the

side rails

5L and 5R. A plurality of

support brackets

7B, 8B to be suspended and supported by the

side rails

5L, 5R are integrally fixed to the outer surface portions of the engine cover 7 and the transmission cover 8 by appropriate means such as welding and bolting. ing. The

support brackets

7B and 8B are superimposed on the

side rails

5L and 5R, and are detachably attached by bolts 9B.

As shown in FIG. 1, the engine cover 7 is also connected to the side rail 5R by a separate bracket 7C, and is connected to the undercross member 6 by an integral bracket 7D.

As shown in FIG. 1, an air introduction member 9 is provided on the bottom surface of the front end of the transmission cover 8. The air introduction member 9 defines an air introduction port 10 opened forward. The air introduction member 9 has a generally dust-like shape when viewed from the front, and extends obliquely downward and forward to a position lower than the engine cover 7. Thereby, in the front view, the air inlet 10 protrudes below the engine cover 7 and faces forward. The air introduction port 10 positively introduces airflow or traveling wind, which is directed toward the vehicle, especially into the transmission cover 8 when the vehicle is traveling, and promotes cooling (air cooling) of the transmission 3 by the traveling wind. In particular, since the flow velocity of the traveling wind tends to be faster at the lower position, the configuration of the air introduction member 9 and the air introduction port 10 protruding downward is advantageous. The rear view shapes of the air introduction member 9 and the air introduction port 10 are shown by phantom lines in FIG.

By providing the engine cover 7 and the transmission cover 8 in this way, a space S surrounded by the left and right side rails 5L and 5R, the engine cover 7 and the transmission cover 8 is formed. In the present embodiment, the space S is also surrounded by the undercross member 6. In this space S, the engine 1, the clutch 2, and the transmission 3 are arranged.

Engine 1 includes an engine body 11. The engine body 11 includes structural parts such as a cylinder head 12, a cylinder block 13, a crankcase 14, an oil pan 15 and a head cover 16, and movable parts (not shown) such as pistons, crankshafts and valves housed therein. Including.

The engine 1 includes an exhaust manifold 17 attached to the right side surface portion of the cylinder head 12 and an exhaust pipe 18 extending downward from the exhaust manifold 17. The exhaust manifold 17 and the exhaust pipe 18 form an exhaust passage member as a heat source through which exhaust gas flows. In the present embodiment, the exhaust manifold 17 and the exhaust pipe 18 are disposed on the right side of the engine 1 in the vehicle width direction, but may be disposed on the left side.

The exhaust pipe 18 extends downward from the longitudinal center of the exhaust manifold 17 and passes through the gap between the right side rail 5R and the engine body 11 and the gap between the engine cover 7 and the engine body 11. That is, the exhaust pipe 18 passes through the space S. The exhaust pipe 18 exits from the engine cover 7 through an exhaust pipe outlet hole 19 provided in the engine cover 7. Then, it is bent backward and extended backward.

The engine 1 includes a flywheel housing 20 that is a component of the engine body 11 at the rear end of the engine body 11. The flywheel housing 20 is fastened and fixed to the rear end portions of the cylinder block 13 and the crankcase 14 by a plurality of bolts (not shown). Reference numeral 20 A denotes a joint surface of the flywheel housing 20.

The clutch housing 22 of the clutch 2 is fastened and fixed to the rear end portion of the flywheel housing 20 by a plurality of bolts 21. 22A denotes a joint surface of the clutch housing 22. In FIG. 2, the center of the crankshaft is indicated by C.

Similarly, the transmission housing 23 of the transmission 3 is fastened and fixed to the rear end portion of the clutch housing 22 by a plurality of bolts 23A (see FIG. 9). Reference numeral 23 A denotes a joint surface of the transmission housing 23.

By the way, this embodiment is characterized in that it includes a heat shield plate that guides the airflow heated by the exhaust manifold 17 and the exhaust pipe 18 and flowing backward from the transmission 3. Therefore, the heat shield plate will be described below.

In this embodiment, the heat shield plate includes a first heat shield plate 31 and a second heat shield plate 32 disposed at a position lower than the first heat shield plate 31. The first and second

heat shield plates

31 and 32 are positions between the exhaust manifold 17 and the exhaust pipe 18 and the transmission 3 in the vehicle length direction, and are the same as the exhaust manifold 17 and the exhaust pipe 18 in the vehicle width direction. Provided on the side (ie right side). Here, the same side means the same side with respect to the crankshaft center C. The first heat shield plate 31 is attached to the rear end portion and the right side portion of the flywheel housing 20 via a bracket and the like which will be described later. The second heat shield plate 32 is directly attached to the front end portion and the lower right portion of the clutch housing 22 by a plurality of (two in this embodiment) bolts and nuts 33.

As shown in FIGS. 1 and 3, the first and second

heat shield plates

31 and 32 are disposed at substantially the same position in the vehicle length direction. The second heat shield plate 32 is disposed at a position substantially directly below the first heat shield plate 31. However, these positions in the vehicle length direction may be shifted. The first and

second heat shields

31 and 32 are substantially the same in the vehicle length direction as the connection part of the engine 1 and the clutch 2, more specifically, the connection part of the flywheel housing 20 and the clutch housing 22. Is arranged.

FIG. 4 shows details of the attachment portions of the first and second

heat shield plates

31 and 32. As shown in the drawing, the upper right end portion of the undercross member 6 is fastened and fixed to the outer surface portion of the right side rail 5R by a plurality (four) of bolts 34 and nuts 35. Near the front of the undercross member 6, the lower right end of the cab rear member 36 is fastened and fixed to the outer surface of the right side rail 5 R by a plurality of bolts 37. The cab rear member 36 is a substantially inverted U-shaped member that receives and supports a cab in a normal state that is not tilted from below, and extends in the vehicle width direction so as to span the left and right side rails 5L and 5R. The opposite left lower end (not shown) is fastened and fixed to the outer surface of the left side rail 5L.

On the undercross member 6, an engine mount 41 including vibration-proof rubber or the like is attached. As shown in FIG. 5, an engine foot 42 as an engine side mounting bracket is attached to the rear end side surface portion of the flywheel housing 20 by a plurality of bolts 43. The engine foot 42 is placed on the engine mount 41 and fixed to the engine mount 41 with bolts 44. As a result, the rear end portion of the engine 1 is supported by the undercross member 6 and thus the frame 4 via the engine foot 42 and the engine mount 41.

As shown in FIG. 5, the engine foot 42 is a member that is long in the vertical direction, and is attached to the flywheel housing 20 with bolts 43 at two places on the upper side and two places on the lower side. A lower end portion 42A of the engine foot 42 protrudes outward (right side) in the vehicle width direction, and an insertion hole 45 through which a fastening bolt 44 to the engine mount 41 is inserted is provided in the lower end portion 42A. The first heat shield 31 is attached to the flywheel housing 20 and thus to the engine 1 using the engine foot 42.

That is, as shown in FIG. 6, the base bracket 46 is attached to the upper end portion of the engine foot 42 by a plurality (two) of bolts 47. The base bracket 46 is overlaid on the right side surface of the upper end portion of the engine foot 42. The bolt 47 is inserted into the bolt insertion hole 48 of the base bracket 46 and tightened into a screw hole (not shown) of the engine foot 42, whereby the base bracket 46 is fixed to the engine foot 42.

The screw hole of the engine foot 42 is originally provided for attaching a hanging bracket for engine suspension in a factory or the like. However, in this embodiment, this metal fitting is not necessary, and the screw hole is a so-called discard hole that is not used. Therefore, this screw hole is effectively used for the installation of the first heat shield plate 31.

The base bracket 46 has an upper surface portion 49 protruding to the right side. A plurality (three) of bolts 50 are provided on the upper surface portion 49 in a standing state by welding. These bolts 50 are inserted into a plurality (three) of bolt insertion holes 52 of the mounting plate 51. By tightening the nut 53 to the bolt 50, the mounting plate 51 is overlapped and fixed on the upper surface portion 49 of the base bracket 46.

At the rear end portion of the mounting plate 51, a mounting surface portion 54 that is bent downward is provided. A plurality (two) of bolts 55 are provided on the mounting surface portion 54 so as to protrude rearward by welding. These bolts 55 are inserted into the plural (two) bolt insertion holes 56 of the first heat shield plate 31, and then inserted into the plural (two) bolt insertion holes 58 of the sandwiching plate 57. When the nut 59 is fastened to the bolt 55, the first heat shield plate 31 is attached in a state of being sandwiched between the attachment surface portion 54 and the sandwiching plate 57.

The additional plastic rivet 60 is inserted into the rivet insertion hole 61 of the first heat shield plate 31 and the rivet insertion hole 62 of the sandwich plate 57 in this order, and then caulked and deformed to place the first heat shield plate 31 into the sandwich plate 57. To fix.

Thus, the first heat shield 31 is attached to the engine foot 42 via the attachment assembly 70 mainly including the base bracket 46, the attachment plate 51, and the sandwiching plate 57.

The first heat shield plate 31 thus attached is suspended from the attachment plate 51 and has a front surface portion 31F facing forward and a rear surface portion 31R facing rearward (see FIG. 11A). The first heat shield 31 is a vertically long rectangular rubber plate, but the shape, material, etc. are arbitrary. As shown in FIG. 2, the first heat shield 31 is disposed in the vehicle width direction outer side (right side) in the vicinity of the flywheel housing 20, and the space S above the engine mount 41, particularly the lower end portion 42 A of the engine foot. Is arranged so as to partially block the space S above the vehicle length direction.

As shown in FIG. 2, the same engine mount 41 and engine foot 42 are provided symmetrically on the left side of the engine 1.

As shown in FIGS. 2 and 9, the second heat shield plate 32 has a substantially arcuate shape along the outer peripheral edge of the front end of the clutch housing 22, and is a metal plate material. A material etc. are arbitrary. A convex portion 71 that fits into the concave portion of the clutch housing 22 is formed on the inner peripheral edge of the second heat shield plate 32. As shown in FIG. 9, a stud bolt 33 A provided in advance in the clutch housing 22 is inserted into a bolt insertion hole (not shown) of the convex portion 71. By tightening the nut 33B to the stud bolt 33A, the second heat shield plate 32 is attached to the clutch housing 22 so as to overlap from the rear.

Thus, the 2nd heat shield 32 which became the attachment state comes to have the front part which turned to the front, and the rear part which turned to the back. As shown in FIG. 2, the outer peripheral edge shape of the second heat shield plate 32 is an angular arch shape that follows the undercross member 6 and the engine mount 41. The second heat shield 32 protrudes outward (right side) in the vehicle width direction from the clutch housing 22, and partially in the vehicle length direction in the space S surrounded by the clutch housing 22, the undercross member 6 and the engine mount 41 in the rear view. It is arranged to block.

Next, the operation of this embodiment will be described.

As shown in FIG. 3, during the traveling of the vehicle, an air flow F 1 caused by traveling wind or the like flows backward in a space S surrounded by the side rails 5 L and 5 R and the engine cover 7. In particular, since there is an exhaust pipe 18 as a heat source in the space S, the air flow F1 is heated when passing through the exhaust pipe 18. Moreover, in the cab-over type truck as in the present embodiment, the cab is above and there are few escape paths for air and heat, so heat tends to be trapped. There is also an air flow F2 that passes through the exhaust manifold 17 which is another heat source, which is also heated when passing through the exhaust manifold 17. Then, it is guided by the cab bottom surface and the bodywork behind the cab and tends to flow toward the transmission 3.

However, according to the present embodiment, the air flows F1 and F2 are caused to collide with the first heat shield plate 31, and the flow direction of the air flows F1 and F2 is changed to be more outward (right side) in the vehicle width direction (deflection). can do. In other words, the heated airflows F 1 and F 2 that flow backward toward the transmission 3 can be guided by the first heat shield plate 31 in a direction away from the transmission 3. The manner in which the air flows F1 and F2 are separated is indicated by a and b in FIG. a is before separation and b is after separation. FIG. 4 also shows how the air flows F1 and F2 are separated.

This keeps the heated airflows F1 and F2 away from the transmission 3 and effectively suppresses an increase in the surface temperature of the transmission 3 due to contact with the airflows F1 and F2, and consequently an increase in the oil temperature of the transmission 3. be able to.

The function of the second heat shield 32 is the same. That is, as shown in FIGS. 2 and 3, the heated air flow F3 that has passed through the inner side (left side) of the engine mount 41 in the vehicle width collides with the second heat shield plate 32, and the direction of the flow is changed. Then, it is changed so that it is more outward in the vehicle width direction (right side) or radially outward with respect to the crankshaft center C. In other words, the air flow F 3 is guided by the second heat shield plate 32 in a direction away from the transmission 3. A state where the air flow F3 is separated is indicated by c and d in FIG. c is before separation and d is after separation. FIG. 4 also shows how the air flow F3 is separated.

Also by this, the heated air flow F3 can be kept away from the transmission 3, and the rise in the surface temperature of the transmission 3 due to the contact with the air flow F3, and thus the oil temperature in the transmission 3 can be effectively suppressed. .

As described above, the first and second

heat shield plates

31 and 32 have the airflows F1 and F2 that flow rearward in the space S surrounded by the side rails 5L and 5R, the engine cover 7 and the transmission cover 8. F3 is configured to be guided in the direction away from the transmission 3 in front of the transmission 3.

In particular, according to the present embodiment, as shown in FIG. 2, the first heat shield 31 is disposed above the engine mount 41, and the second heat shield 32 is disposed on the inner side (left side) of the engine mount 41 in the vehicle width direction. Has been placed. The air flows F1 and F2 flowing in the space S above the engine mount 41 are blocked in the vehicle length direction by the first heat shield plate 31, and the air flow F3 flowing in the vehicle width direction inner side (left side) of the engine mount 41 is second. The heat shield plate 32 is configured to shield in the vehicle length direction. For this reason, the engine mount 41 can also be used to prevent the heated airflow from approaching or contacting the transmission 3. And the installation area of the 1st and 2nd

heat shield plates

31 and 32 can be reduced, and cost can be reduced.

Since the first and second

heat shield plates

31 and 32 are arranged at substantially the same position in the vehicle length direction, the gap between the heat shield plates is reduced as much as possible, and the air flow shielding effect and the separation effect are increased. Can be made.

Next, a modified example will be described.

7 to 10 show the configuration of the first modification. In addition, the same code | symbol is attached | subjected in the figure to the part similar to the above-mentioned basic embodiment, description is omitted, and below, mainly a difference with basic embodiment is demonstrated.

This first modification is different from the basic embodiment in that the first heat shield 31 and its peripheral structure are different and an additional third heat shield 73 is provided. The second heat shield plate 32 and its peripheral structure are the same as in the basic embodiment.

As shown in FIG. 7, the first heat shield 31 includes a protruding portion 74 that protrudes outward (right side) in the vehicle width direction, in addition to having the basic shape of a vertically long rectangle similar to the basic embodiment. The protrusion 74 protrudes into the right side rail 5R. The lower end edge 74A of the projecting portion 74 is extended in the horizontal direction along the upper surface of the lower plate 75 of the right side rail 5R. The upper end edge 74B of the protrusion 74 is inclined so that the height decreases as it goes to the right.

By configuring the first heat shield plate 31 in this way, the air flows F1 and F2 that collide with the first heat shield plate 31 are positioned higher above the protrusion 74 and more outward in the vehicle width direction (right side). ) From the position on the right side of the protruding portion 74, it is possible to escape backward. Therefore, the airflows F1 and F2 can be further away from the transmission 3, and an increase in the oil temperature of the transmission 3 can be suppressed.

This first modification is also similar in that the first heat shield plate 31 is installed using the engine foot 42. However, the configuration of the mounting portion to the engine foot 42 (that is, the configuration of the mounting assembly) differs as follows.

That is, as shown in FIG. 8, the base bracket 76 is attached to the upper end portion of the engine foot 42 by a plurality (two) of bolts 47 using the screw holes that are the aforementioned discard holes. The structure of the base bracket 76 is slightly different, and the upper surface portion 77 is substantially L-shaped and has a plurality (two) of screw holes 78.

As shown in FIG. 7, adjacent to the rear part of the base bracket 76, the mounting plate 79 is disposed so as to hang down. A plurality (two) of bolts 80 are inserted into a plurality of (two) bolt insertion holes (not shown) at the upper end of the mounting plate 79, and then into a plurality of (two) screw holes 78 of the base bracket 76. The mounting plate 79 is fixed to the base bracket 76 by being tightened.

The mounting plate 79 is substantially U-shaped or square U-shaped with the vehicle width direction outer side (right side) open, and has a frame shape that supports the three sides of the first heat shield plate 31. The first heat shield 31 is overlapped on the front surface of the mounting plate 79 and is fixed by rivets 81 at two locations on the top and bottom. As described above, the material of the first heat shield plate 31 is arbitrary, but in this first modification, a thin plate metal such as iron or aluminum is used.

As shown in FIGS. 9 and 10, the third heat shield plate 73 is disposed at a position ahead of the first and second

heat shield plates

31 and 32. Specifically, the third heat shield 73 is disposed at a position between the engine cover 7 and the undercross member 6 in the vehicle length direction, disposed at a position in front of the engine mount 41, and joined to the flywheel housing 20. It is arranged at a position near the surface 20A. As described above, the positions of the third heat shield 73 and the first and

second heat shields

31 and 32 are shifted back and forth in the vehicle length direction. Although the attachment method of the 3rd heat shield 73 is arbitrary, in this example, it attaches to at least one of the engine cover 7 and the under cross member 6. FIG.

The third heat shield plate 73 has a substantially arch shape like the second heat shield plate 32, and the inner peripheral edge thereof is shaped along the outer peripheral edge of the flywheel housing 20. The position of the third heat shield 73 in the height direction is generally lower than the second heat shield 32, and when viewed from the rear, the space S below the flywheel housing 20 passes through the second heat shield 32. And the third heat shield plate 73 are configured to shield in the vehicle length direction. Note that the third heat shield 73 is disposed on the right side in the vehicle width direction in the same manner as the second heat shield 32.

By providing the third heat shield plate 73, before reaching the second heat shield plate 32, the heated air flow is made to collide with the third heat shield plate 73 and the direction thereof is separated from the transmission 3. I can guide you. And the oil temperature rise of the transmission 3 can be suppressed. Since the second heat shield plate 32 only has to guide the air flow leaking behind the third heat shield plate 73 in the separation direction, the separation guide by the second heat shield plate 32 can be surely performed.

Next, a second modification will be described. This second modification is different from the basic embodiment in that the shape of the first heat shield plate 31 is different.

FIG. 11A shows a cross-sectional shape of the first heat shield 31 of the basic embodiment. In the basic embodiment, the first heat shield plate 31 is a simple flat plate and extends linearly in the vehicle width direction. The state in which the air flows F1 and F2 are separated and guided is as shown in the figure.

On the other hand, FIG. 11B shows a cross-sectional shape of the first heat shield 31 of the second modification. As shown in the drawing, the first heat shield plate 31 has an inclined portion 85 that is inclined rearward on the outer side (right side) in the vehicle width direction. When such an inclined portion 85 is provided, the air flows F1 and F2 after the collision can be guided more smoothly on the right side, and the air flows F1 and F2 discharged from the inclined portion 85 can be guided further to the right side. . Therefore, the air flows F1 and F2 after passing through the first heat shield plate 31 can be further away from the transmission 3, and an increase in the oil temperature of the transmission 3 can be suppressed.

The formation method of the inclined portion 85 is arbitrary. For example, the inclined portion 85 can be formed by changing the basic shape of the first heat shield plate 31 of the basic embodiment from a simple flat plate shape to a twisted shape in which the lower end portion is twisted. Alternatively, the inclined portion 85 can be formed by changing the basic cross-sectional shape of the first heat shield plate 31 uniformly in the vertical direction as shown in FIG. Although the curved inclined portion 85 is shown in FIG. 11B, a bent inclined portion 85 may be used. It is good also as the inclination part 85 inclined in multiple steps. In the first heat shield plate 31, the shape of the front surface portion 31F where the air flows F1 and F2 collide is important. Therefore, the first heat shield plate 31 may be made thicker, and the thickness of the first heat shield plate 31 may be made thinner toward the right side, so that the inclined portion 85 may be formed only on the front surface portion 31F.

In addition, you may form an inclination part in the whole vehicle width direction of the 1st heat shield 31. FIG. An inclined portion may be formed on at least one of the second and third

heat shield plates

32 and 73. You may form an inclination part in the 1st heat shield 31 of a 1st modification.

The embodiment of the present disclosure has been described in detail above, but various other embodiments of the present disclosure are conceivable. For example, only one heat shield plate may be provided, or four or more heat shield plates may be provided. In the above embodiment, the first to third

heat shield plates

31, 32, 73 are arranged so as to be behind the two heat sources (the exhaust manifold 17 and the exhaust pipe 18). However, at least one heat source is used. What is necessary is just to arrange | position at least 1 heat-shielding board behind this. Therefore, for example, the first heat shield plate 31 may be disposed so as to be in front of the rear end of the exhaust manifold 17 but behind the exhaust pipe 18. When the exhaust manifold 17 and the exhaust pipe 18 are arranged on the left side, the first to third

heat shield plates

31, 32, 73 are also arranged on the left side.

The embodiment of the present disclosure is not limited to the above-described embodiment, and includes all modifications, application examples, and equivalents included in the idea of the present disclosure defined by the scope of the claims. Therefore, the present disclosure should not be construed as being limited, and can be applied to any other technique belonging to the scope of the idea of the present disclosure.

This application is based on a Japanese patent application (Japanese Patent Application No. 2016-010944) filed on January 22, 2016, the contents of which are incorporated herein by reference.

According to the vehicle heat shielding structure of the present disclosure, it is possible to suppress an increase in the oil temperature of the transmission.

DESCRIPTION OF SYMBOLS 1 Engine 3

Transmission

5L, 5R Side rail 7 Engine cover 8 Transmission cover 17 Exhaust manifold 18 Exhaust pipe 20 Flywheel housing 22 Clutch housing 31 First heat shield 32 Second heat shield 73 Third heat shield F1, F2, F3 air flow

Claims

An engine, a transmission disposed behind the engine in the vehicle length direction, and an exhaust passage member disposed on a side of the engine in the vehicle width direction and through which exhaust gas flows.
An air flow that is heated by the exhaust passage member and flows rearward is positioned at a position between the exhaust passage member and the transmission in the vehicle length direction and on the same side as the exhaust passage member in the vehicle width direction. A heat shield structure for a vehicle including a heat shield plate that guides in a direction away from the machine.
The vehicle includes a side rail that is positioned on both sides in the vehicle width direction, and the engine, the transmission, and the exhaust passage member are disposed therebetween, and an engine that covers both side surfaces and a bottom surface of the engine below the side rail. A cover, and a transmission cover that covers both side surfaces and a bottom surface of the transmission below the side rail,
The heat shield plate guides an air flow that flows backward in a space surrounded by the side rail, the engine cover, and the transmission cover in a direction away from the transmission in front of the transmission. The vehicle heat shielding structure according to claim 1, wherein the vehicle heat shielding structure is configured as described above.
The vehicle heat shield structure according to claim 1, wherein the heat shield plate includes a first heat shield plate and a second heat shield plate disposed at a position lower than the first heat shield plate.
The vehicle heat shield structure according to claim 2, wherein the heat shield plate includes a first heat shield plate and a second heat shield plate disposed at a position lower than the first heat shield plate.
The first heat shield plate is attached to a flywheel housing at a rear end portion of the engine, and the second heat shield plate is attached to a clutch housing connected to a rear end portion of the flywheel housing. The vehicle heat-insulating structure described in 1.
5. The first heat shield plate is attached to a flywheel housing at a rear end portion of the engine, and the second heat shield plate is attached to a clutch housing connected to a rear end portion of the flywheel housing. The vehicle heat-insulating structure described in 1.