JP6048434B2 - Floor cooling structure - Google Patents

Description

  The present invention relates to a floor cooling structure.

  2. Description of the Related Art Conventionally, an FR (front engine rear wheel drive) type sports-type vehicle is known in which a transmission, a propeller shaft, an exhaust pipe, and the like are routed in a tunnel portion at the center of the floor. The exhaust pipe is provided with a catalyst in order to satisfy the exhaust gas standard.

  Here, when the catalyst is arranged in the engine room, the calorific value increases, so it is necessary to provide a gap for suppressing the influence of heat on the waterproof seal or the like. As a result, there is a problem that the layout of the collision buffer space for the engine and auxiliary equipment and the vehicle and the collision of the pedestrian becomes difficult, and the vehicle is enlarged to establish the layout.

  In addition, when the catalyst is disposed behind the vehicle from the seat, the exhaust gas temperature decreases before the exhaust gas reaches the catalyst, and the catalyst temperature rise at the time of cold start is delayed and the purification efficiency deteriorates. There is a problem of end up.

  Therefore, the catalyst is preferably disposed inside the tunnel portion. By the way, the catalyst operates at a high temperature and generates heat by a reaction of exhaust purification, so that the floor panel above the catalyst is heated to a high temperature. In particular, when the atmospheric temperature is high, such as in summer, the floor high temperature part is equal to or higher than the body temperature (about 40 ° C.). Here, if the catalyst is disposed in the vicinity of the feet of the occupant below the floor panel, there is a problem that the occupant's feet touch the floor mat near the upper portion of the floor high temperature part and feel uncomfortable.

  In order to solve such a problem, for example, as in the invention of Patent Document 1, by arranging a cooling air guide duct between the high temperature floor portion and the floor mat, the high temperature floor portion is forcibly forced. It is conceivable to cool. It is also conceivable to cool the hot floor area by directly blowing cool air to the hot floor area using the foot air conditioning duct.

JP 59-032513

  However, when the cooling air guide duct is disposed below the floor mat as in the invention of Patent Document 1, there is a problem that cushioning properties and sound absorption properties are deteriorated. In addition, since strength is required to withstand the occupant's stepping, there is a problem that the floor becomes taller and costs increase by increasing the thickness of the duct. Furthermore, there is a problem that productivity is deteriorated because man-hours for connecting ducts increase during assembly.

  Further, when cold air is directly blown to the floor high-temperature part by the foot air conditioning duct, there is a problem that the feet of the occupant are excessively cooled by the cold air and the user feels uncomfortable.

  This invention is made | formed in view of this point, The objective is to enable it to cool a floor high temperature part efficiently with a comparatively simple structure.

  According to the present invention, a catalyst is disposed in the vicinity of the foot of an occupant below a floor panel of a vehicle, so that a floor high temperature portion where a part of the floor panel becomes high temperature is provided, and the floor high temperature portion is cooled. The following solutions were taken for the floor cooling structure.

That is, in the first invention, the surface of the floor panel is covered with an interior material,
Between the floor high temperature part and the interior material in the floor panel, a filler having higher air permeability than the interior material is provided,
A cold air supply device for generating cold air;
Due to the heat convection generated inside the filler, hot air in the high-temperature floor is released through the filler and cold air generated by the cold air supply device penetrates into the filler so that the floor high temperature And a cool air outlet for blowing out cool air toward the periphery of the filler so that the portion is cooled.

  In 1st invention, the filler which has air permeability higher than an interior material is provided between the floor high temperature part and interior material in a floor panel. And by the thermal convection which arises inside a filler, the hot air of a floor high temperature part is discharge | released via a filler, while the cold air blown off from the cold air blower outlet to the filler periphery is osmose | permeated inside the filler.

  With such a configuration, the floor high temperature part can be efficiently cooled with a relatively simple structure, so even if the occupant's feet touch the interior material near the upper part of the floor high temperature part, discomfort is felt. I never remember it. In addition, by adopting a floor cooling structure that uses thermal convection of the filler, a separate outlet is provided to release hot air from the hot floor area, and wind pressure is used to send cold air to the hot floor area and scavenge hot air. There is no need to raise it.

According to a second invention, in the first invention,
The filler is made of a material having heat insulation, silence, and elasticity.

  In the second invention, since the filler is made of a material having heat insulation, silence, and elasticity, the hot air from the floor high temperature part is insulated by the filler and hardly transmitted to the passenger's feet. Moreover, since the filler has silence (specifically, at least one of sound absorption, sound insulation, and vibration control), noise can be suppressed. Furthermore, since the filler has elasticity, it is easy to assemble even if it has a complicated floor shape, and further, the cushioning property when the occupant steps on the filler is good and the texture can be improved.

According to a third invention, in the first or second invention,
The cold air outlet is disposed away from the filler.

  In the third invention, since the cold air outlet is separated from the filler, positioning of the cold air outlet and the filler is easier than in the case where the cold air outlet and the filler are connected by a duct or the like. It becomes. Further, it is not necessary to connect the cold air outlet and the filler with a duct or the like, and the assembling property is improved.

According to a fourth invention, in any one of the first to third inventions,
The floor panel is provided with a tunnel portion that bulges upward and extends in the vehicle front-rear direction,
The floor high temperature part is provided at a lower position on a side surface of the tunnel part,
The filler covering the side surface of the tunnel portion is formed with a cold air guide groove for guiding the cold air blown from the cold air outlet toward the filler covering the high temperature floor portion. To do.

  In 4th invention, the cold air guide groove is formed in the filler which covers the side surface of a tunnel part. The cold air blown out from the cold air outlet flows through the cold air guide groove toward the filler covering the high temperature floor portion. Thereby, cold air can be smoothly supplied with respect to the filler which covers a floor high temperature part.

  According to the present invention, the floor high temperature part can be efficiently cooled with a relatively simple configuration, so even if the occupant's feet touch the interior material near the upper part of the floor high temperature part, the user feels uncomfortable. There is no end. In addition, by adopting a floor cooling structure that uses thermal convection of the filler, a separate outlet is provided to release hot air from the hot floor area, and wind pressure is used to send cold air to the hot floor area and scavenge hot air. There is no need to raise it.

It is side surface sectional drawing which shows the structure of the vehicle which concerns on this embodiment. It is side surface sectional drawing which shows the structure of a floor high temperature part periphery. It is AA arrow sectional drawing of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature and is not intended to limit the present invention, its application, or its use.

  As shown in FIG. 1, an engine 12 is disposed in an engine room 11 at the front of the vehicle 10. A transmission 13 (see FIG. 3) is connected to the engine 12, and the engine 12 and the transmission 13 constitute a power train.

  The vehicle rear side wall of the engine room 11 includes a dash panel 14 that partitions the engine room 11 and the vehicle compartment S. The dash panel 14 extends in the vertical direction and the vehicle width direction. The lower end portion of the dash panel 14 is coupled to the front end portion of the floor panel 30 constituting the floor surface of the passenger compartment S.

  A floor frame 38 extending in the vehicle front-rear direction is joined to the floor panel 30 (see FIG. 3). The floor frame 38 is formed in a U-shaped cross-section with an opening at the bottom, and is joined to the upper surface of the floor panel 30 by a joining flange portion projecting in the vehicle width direction.

  In the passenger compartment S, a seat 26 for the passenger H to sit is disposed. A footrest 27 for the occupant H to place his / her foot on the front of the vehicle in the passenger compartment S is provided.

  A tunnel portion 31 bulging upward is formed at the vehicle width direction center portion of the floor panel 30 so as to extend in the vehicle front-rear direction. And the vehicle width direction center part of the lower end part of the dash panel 14 is notched upward so as to be connected to the tunnel part 31.

  The engine 12 is provided with an exhaust manifold 15 for discharging exhaust gas in each cylinder of the engine 12. An exhaust pipe 16 is connected to the exhaust manifold 15.

  The exhaust pipe 16 is routed so as to pass through the inside of the tunnel portion 31 (outside the passenger compartment S), and extends below the floor panel 30 along the tunnel portion 31 in the vehicle front-rear direction. Since the vehicle 10 of the present embodiment is an FR (front engine rear wheel drive) type sports type vehicle 10, the interior of the tunnel portion 31 together with the exhaust pipe 16 is a drive wheel for rear wheel drive (not shown). Has passed.

  The exhaust pipe 16 is provided with an upstream first catalyst 17 having a larger diameter and a higher temperature than the pipe portion of the exhaust pipe 16 and a downstream second catalyst 18. The second catalyst 18 is covered with a heat shield cover 18a. A muffler 19 is attached to the rear end of the exhaust pipe 16.

  The first catalyst 17 is disposed near the entrance of the tunnel portion 31 in the engine room 11. The second catalyst 18 is disposed between the seat 26 and the footrest 27 inside the tunnel portion 31, that is, in the vicinity of the foot of the occupant H below the floor panel 30.

  Specifically, a part of the floor panel 30 bulges toward the passenger compartment S side so as to continue from the lower position of the right side surface of the tunnel portion 31 to the floor surface of the driver's seat (see FIG. 3). The second catalyst 18 is disposed at the bulging portion inside the tunnel portion 31.

  Here, since the second catalyst 18 operates at a high temperature and generates heat due to an exhaust purification reaction, the bulging portion of the floor panel 30 above the second catalyst 18 is heated by the second catalyst 18 to a high temperature. The floor high temperature part 32 which becomes will be provided.

  As shown in FIGS. 2 and 3, the surface of the floor panel 30 is covered with a floor mat 35 as an interior material. An insulator 36 as a filler is provided between the floor mat 35 and the floor panel 30. The insulator 36 between the side surface of the tunnel portion 31 and the floor mat 35 and between the floor high temperature portion 32 and the floor mat 35 is made of a material having higher air permeability than the floor mat 35.

  Specifically, the insulator 36 is formed of sponge, non-woven fabric, cotton, carpet-like material formed of dense napping, pellet-like material such as beads and buckwheat, granular rubber, and porous laminated material. It is made up of the material made.

  Moreover, the insulator 36 is comprised with the raw material which has heat insulation, silence, and elasticity. Thereby, the hot air from the floor high temperature part 32 is insulated by the insulator 36 and is not easily transmitted to the passenger's H leg. Moreover, since the insulator 36 has silence (specifically, at least one of sound absorption, sound insulation, and vibration control), noise can be suppressed. Furthermore, since the insulator 36 has elasticity, it is easy to assemble even if it has a complicated floor shape. Furthermore, the cushioning property when the occupant H steps on the insulator 36 is good, and the texture can be improved.

  Although sound insulation and air permeability seem to contradict each other, the insulator 36 has a higher air permeability layer than the floor mat 35 and a layer having a higher density and lower air permeability, or a shielding film layer. In this case, it is possible to achieve both sound insulation in the direction perpendicular to the surface of the floor panel 30 while facilitating the flow of air along the floor panel 30.

  A center console front trim 29 extending in the vehicle front-rear direction is disposed at the left and right upper corners of the center console 28 constituting the tunnel portion 31. A gap is provided between the right side surface of the tunnel portion 31 and the center console front trim 29 for introducing cool air blown from a cool air outlet 25 of the air conditioner 23 described later. The insulator 36 covering the right side surface of the tunnel portion 31 is formed with a cold air guide groove 36a for guiding the cold air blown from the cold air outlet 25 of the air conditioner 23 toward the insulator 36 covering the floor high temperature portion 32. Yes.

  An instrument panel member 20 extending in the vehicle width direction is disposed behind the dash panel 14. An instrument panel 22 is supported on the instrument panel member 20 via an instrument panel stay 21.

  Inside the instrument panel 22 is accommodated an air conditioner 23 (cold air supply device) that introduces air and generates conditioned air. The air conditioning duct 24 of the air conditioner 23 is provided with a cold air outlet 25 for blowing out the cold air generated by the air conditioner 23 downward.

  The cold air outlet 25 is for blowing cold air toward the gap between the right side surface of the tunnel portion 31 and the center console front trim 29, and is disposed away from the insulator 36 that covers the tunnel portion 31. Thereby, compared with the case where the cool air blower outlet 25 and the insulator 36 are connected by a duct etc., positioning of the cool air blower outlet 25 and the insulator 36 becomes easy. Further, even if the positioning is slightly deviated, it is possible to supply cool air without any problem, so that the assemblability and productivity can be improved.

  The cold air blown out from the cold air outlet 25 is supplied toward the periphery of the insulator 36 covering the floor high temperature portion 32 through the cold air guide groove 36 a formed in the insulator 36 covering the right side surface of the tunnel portion 31.

  Here, the cold air guide groove 36a extends downward along the right side surface of the tunnel portion 31, and is formed in a funnel shape so that the opening gradually increases toward the upstream side. Thereby, even when the cold air outlet 25 and the upstream end of the cold air guide groove 36a are separated from each other, the cold air has a large specific gravity with respect to the surrounding air, so that the cold air can be effectively collected by the cold air guide groove 36a. Can be smoothly supplied downward.

  Inside the insulator 36 that covers the floor high temperature portion 32, heat convection is generated by the hot air in the floor high temperature portion 32 and the cold air supplied to the periphery of the insulator 36. Specifically, the hot air in the high-temperature floor portion 32 is released through the insulator 36 by heat convection generated inside the insulator 36. Further, the cold air supplied from the air conditioner 23 is permeated into the insulator 36 by heat convection.

  Thereby, although the insulator 36 is arranged in the floor high temperature part 32, the floor high temperature part 32 can be efficiently cooled and the temperature of the floor high temperature part 32 can be reduced to 40 ° C. or less. Therefore, even if the foot of the occupant H touches the floor mat 35 in the vicinity of the upper portion of the high-temperature floor portion 32, no discomfort is felt.

  Further, by adopting a floor cooling structure using the thermal convection of the insulator 36, a separate outlet for releasing hot air from the high temperature floor portion 32 is provided, or cold air is sent to the high temperature floor portion 32 and hot air is scavenged. There is no need to increase the wind pressure.

  Moreover, the floor high temperature part 32 is provided in the lower position in the right side surface of the tunnel part 31, and the insulator 36 which covers the right side surface of the tunnel part 31 has high air permeability. Therefore, it is promoted that the hot air in the floor high temperature portion 32 rises and diffuses through the insulator 36, and the cooling performance is improved. In the present embodiment, the highly breathable insulator 36 is provided between the right side surface of the tunnel portion 31 and the floor mat 35. However, this portion may have a hollow structure without providing the insulator 36.

  In addition, a hollow portion 37 may be formed around the insulator 36 of the high-temperature floor portion 32 so as to communicate with the cold air guide groove 36 a and surround the insulator 36.

  The hollow portion 37 does not cause the cold air to be scattered by avoiding the insulator 36 of the high-temperature floor portion 32, but instead, as shown by the arrows in FIG. 2, the cold air is smoothly guided to a wide area around the insulator 36, Since it is possible to efficiently infiltrate from a portion where infiltration by heat convection in the insulator 36 is easy, there is an effect that cooling of the floor high temperature portion 32 can be promoted without particularly considering the flow path of heat convection.

  As described above, the present invention is extremely useful and has high industrial applicability because it has a relatively simple configuration and can obtain a highly practical effect of efficiently cooling the high-temperature floor portion.

10 Vehicle
18 Second catalyst 23 Air conditioner (cold air supply device)
25 Cold air outlet 30 Floor panel 31 Tunnel part 32 Floor high temperature part 35 Floor mat (interior material)
36 Insulator (filler)
36a Cold air guide groove H Crew

Claims (4)

A floor cooling structure for cooling a floor high temperature part by providing a floor high temperature part in which a part of the floor panel becomes high temperature by disposing a catalyst near the foot of an occupant below a floor panel of a vehicle Because
The surface of the floor panel is covered with an interior material,
Between the floor high temperature part and the interior material in the floor panel, a filler having higher air permeability than the interior material is provided,
A cold air supply device for generating cold air;
Due to the heat convection generated inside the filler, hot air in the high-temperature floor is released through the filler and cold air generated by the cold air supply device penetrates into the filler so that the floor high temperature A floor cooling structure comprising a cold air outlet for blowing out cold air toward the periphery of the filler so that the portion is cooled. In claim 1,
The floor cooling structure according to claim 1, wherein the filler is made of a material having heat insulation, silence, and elasticity. In claim 1 or 2,
The floor cooling structure, wherein the cold air outlet is disposed away from the filler. In any one of claims 1 to 3,
The floor panel is provided with a tunnel portion that bulges upward and extends in the vehicle front-rear direction,
The floor high temperature part is provided at a lower position on a side surface of the tunnel part,
The filler covering the side surface of the tunnel portion is formed with a cold air guide groove for guiding the cold air blown from the cold air outlet toward the filler covering the high temperature floor portion. Floor cooling structure.

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