JP2011131689A - Heat shield plate structure of vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat shield plate structure of a vehicle having a good heat shield efficiency. <P>SOLUTION: A catalyst heat shield plate 11 is provided between a catalyst converter 10 and transmission control cables 23, 23, a wire harness member 24 and a sensor device 25. The guide part 11c of the catalyst heat shield plate 11 guides the air flow passing above the upper surface 6a of a transmission 6 to the periphery of the sensor device 25 and between the guide part 11c and guide surfaces 28a, 28b, and leads the air flow to the rear side of the vehicle. The air flow abuts the transmission control cables 23, 23 positioned on the lower surface side 14a of a floor tunnel part 14, thereby preventing the temperature rise. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a heat shield structure applied to an exhaust system of a vehicle.

  2. Description of the Related Art Conventionally, as a heat shield structure of a vehicle, a heat shield that covers a catalytic converter is known (see Patent Document 1).

  2. Description of the Related Art In recent years, some front-wheel drive vehicles adopt a so-called horizontal engine layout that has a crankshaft along the vehicle width direction. In such a case, there is a tendency for an increase in the number of vehicles equipped with a rear exhaust engine that is supplied with air from the front side of the engine head and exhausts from the rear side of the engine head. A catalyst is provided in the middle of the exhaust pipe to purify the exhaust gas. Since the exhaust pipe catalyst purifies the exhaust gas, the exhaust gas cannot be purified unless the temperature is raised to some extent. For this reason, a catalytic converter is provided in the middle of the exhaust pipe located in the vicinity of the rear surface side of the engine head so that the catalyst contained therein is positioned between the dash panel of the vehicle body in the vicinity of the engine. The structure to be made is disclosed (see Patent Document 1).

  In such a thing, this floor tunnel part formed in the floor panel of the vehicle body extends from the front side near the dash panel to the upper part of the transmission that is connected to the crankshaft along the vehicle width direction of the engine. The transmission control cable is routed.

  In addition, a wire harness member and various sensor devices are installed in the upper part of the transmission, and the catalyst that becomes the high temperature is provided in the vicinity of the wire harness members and the various sensor devices.

JP 2005-171792 A

  However, in such a conventional vehicle heat shield structure, the transmission control cable and other wire harness members are routed in the vicinity of the high-temperature catalyst, and the heat is radiated as well as various sensor devices. There was a risk of joining.

  Accordingly, an object of the present invention is to provide a vehicle heat shield structure with good heat shield efficiency.

  To achieve the above object, according to the present invention, a catalyst is provided in an engine room of a vehicle between a rear exhaust engine and a dash panel forming a rear wall portion of the engine room in which the engine is housed. Has been placed.

  In addition, a catalyst heat shield is provided between a functional component attached to a transmission connected to the engine and the catalyst.

  The functional component is routed from the transmission to a floor tunnel portion formed from the dash panel toward the rear of the vehicle, and the catalyst heat shield is directed toward the functional component of the floor tunnel portion. A guide portion for guiding the air flow is provided.

  Here, the functional component mainly refers to a transmission control cable that extends toward the rear of the vehicle and transmits a transmission control signal, another wire harness member, or various sensor devices that are attached to the transmission. And a part that performs a function for controlling the transmission.

  According to the present invention, the heat generated in the catalyst and the radiant heat from the catalyst are transferred by the functional component mounted on the transmission connected to the engine and the catalyst heat shield plate located between the catalyst and the catalyst. Is cut off and the functional parts are protected.

  Further, the air flow is guided by the guide portion of the catalyst heat shield plate, and is guided toward the functional component arranged in the floor tunnel portion. For this reason, the temperature rise of the functional component mounted on the transmission and the functional component routed in the floor tunnel portion is positively suppressed, and a heat shield structure for a vehicle having good heat shield efficiency is obtained. Provided.

1 is a plan view of a vehicle heat shield structure according to an embodiment of the present invention, illustrating an overall configuration and omitting a hood panel at the front of the vehicle. FIG. 2 is an end view at a position along the line AA in FIG. 1, illustrating a configuration of a main part in the vehicle heat shield structure of the embodiment. FIG. 2 is an end view at a position along the line B-B in FIG. 1, illustrating a configuration of a main part in the vehicle heat shield structure of the embodiment. 1 is a partially omitted perspective view of an engine room for explaining a configuration in which a blower is mounted on a front portion of a vehicle in a vehicle heat shield structure according to an embodiment. 1 is an enlarged perspective view illustrating a configuration of an engine room in which a motor fan device is omitted in the vehicle heat shield structure of an embodiment. FIG. It is sectional drawing along the vehicle front-back direction explaining the structure of each part provided in the engine room by the heat shield structure of the vehicle of the embodiment. It is a vehicle width direction longitudinal cross-sectional view explaining the structure of each part provided in the engine room by the heat shield board structure of the vehicle of embodiment.

  Hereinafter, a heat shield structure for a vehicle according to an embodiment of the present invention will be described with reference to the drawings. 1 to 7 show a vehicle heat shield structure according to an embodiment of the present invention. First, in terms of the overall configuration, in the vehicle heat shield structure of this embodiment, as shown in FIG. 1, an engine room 3 is provided in the front portion 2 of the vehicle 1, and this engine room is provided. 3, left and right side member members 4 and 4 are extended on both left and right sides in the vehicle width direction so that the longitudinal direction thereof is along the vehicle front-rear direction.

  Between these left and right side member members 4, 4, the engine 5 is housed horizontally so that the extending direction of the crankshaft 5 a extends along the vehicle width direction. In this embodiment, the transmission 6 is mounted and connected in the vicinity of the inner surface of the left side member member 4 on the left side of the vehicle in the extending direction of the crankshaft 5a. A transmission mechanism (not shown) is provided inside the transmission 6 and is connected to the crankshaft 5a.

  The rotational driving force of the crankshaft 5a of the engine 5 is transmitted to the front tire members 7 and 7 via the axle members 8 and 8 by variably controlling the speed reduction ratio of the transmission mechanism. In addition, it is configured to be controllable as appropriate.

  The engine 5 of this embodiment is so-called rear exhaust in which air is supplied from the front side of the engine head 5b as a crank head and exhausted from the exhaust port 5c provided on the rear side of the engine head 5b. The configuration is shown.

  In such a rear exhaust engine 5, an exhaust manifold 9 is connected to an exhaust port 5c located on the rear surface side of the engine head 5b. As shown in FIG. 1, an exhaust pipe 16 is connected to the downstream end portion of the exhaust manifold 9 via a catalytic converter 10, and inside the catalytic converter 10, as shown in FIG. The catalyst 10a is accommodated. The catalyst 10 a is connected to an exhaust manifold 9 directly connected to the exhaust port 5 c of the engine 5. For this reason, it can be arranged in the vicinity of the exhaust port 5c, and the high temperature exhaust gas is guided into the catalytic converter 10 so that it can easily reach the temperature at which the exhaust gas purifying function functions sufficiently. It is configured.

  A dash panel 12 that defines the engine room 3 and the passenger compartment R is provided on the rear side in the vehicle longitudinal direction of the catalytic converter 10.

  Further, as shown in FIG. 3, the vehicle body floor panel member 13 located behind the dash panel 12 is provided so as to protrude upward along the vehicle front-rear direction so that the cross-sectional shape in the vehicle width direction has a substantially hat shape. A floor tunnel portion 14 formed so as to bulge is integrally provided. An exhaust pipe 16 extending from the catalytic converter 10 is connected to the lower side of the floor tunnel portion 14 and is discharged from the engine 5 to an exhaust muffler member (not shown) provided at the rear of the vehicle. The exhaust gas is configured to be sent. In this embodiment, an exhaust pipe heat shield plate 15 is provided between the lower surface side 14 a of the floor tunnel portion 14 and the exhaust pipe 16.

  The exhaust pipe heat shield plate 15 is formed with a shelf-like recess 15a having a concave cross section, and the left and right edges in the vehicle width direction are fixed to the inner side surface of the floor tunnel portion 14, respectively. ing.

  As a result, a space portion 20 having a certain distance in the upward and downward directions is formed between the upper surface side 15b and the central partition wall portion 15c and the lower surface side 14a and the left side surface 14b of the floor tunnel portion 14. It is configured.

  Further, in this embodiment, as shown in FIG. 1, a control unit 21 for performing transmission control of the transmission 6 is provided on the upper surface side of the floor tunnel portion 14, and above the control unit 21. The shift lever member 22 projecting upward from the floor portion in the passenger compartment R is supported so as to be swingable, so that each shift position such as the traveling mode and the reverse mode can be selected. .

  Further, the control unit 21 is connected to rear end portions 23b, 23b of transmission control cables 23, 23 as one of functional components for transmitting these shift position signals to the transmission 6.

  These transmission control cables 23, 23 are inserted into the floor tunnel portion 14 through the lid member 26 toward the front of the vehicle, and at the midpoint in the extending direction, the bottom surface of the floor tunnel portion 14. It is supported by a mounting bracket member 27 secured to the side 14a.

  The front end portions 23 a and 23 a of the transmission control cables 23 and 23 are respectively connected to and secured to the upper surface portion 6 a of the transmission 6. One end 24a of a wire harness member 24 as one of functional components is connected to the upper surface portion 6a of the transmission 6, and a sensor device 25 as one of functional components connected to the other end 24b includes It is spaced apart and fixed from the one end 24a.

  A catalyst heat shield plate 11 is provided between the transmission control cables 23 and 23, the wire harness member 24 and the sensor device 25 as the functional components, and the catalytic converter 10.

  As shown in FIG. 6, the catalyst heat shield plate 11 is integrally provided with a fixing portion 11a, a shielding portion 11b, and a guide portion 11c, and has a substantially flat plate shape.

  Further, in this embodiment, the front end portions 23 a and 23 a of the transmission control cables 23 and 23 are respectively attached to the upper surface side bracket member 28 provided on the upper surface portion 6 a of the transmission 6. On the upper surface side bracket member 28, guide surface portions 28a and 28b are integrally formed so as to extend in parallel with the guide portion 11c of the catalyst heat shield plate 11 in a top view. Among these, as shown in FIG. 2, the sensor device 25 is positioned between the guide portion 11c and the guide surface portion 28a.

  Then, as shown in FIG. 5, the air flow passing from above the transmission 6 to above the upper surface portion 6a of the transmission 6 is surrounded by the sensor device 25 as indicated by white arrows in FIG. And is guided in the vehicle rearward direction between the guide portion 11c and the guide surface portions 28a and 28b.

  For this reason, the air flow is guided in the direction of the space portion 20 formed between the exhaust pipe heat shield plate 15 and the lower surface side 14a of the floor tunnel portion 14.

  Further, in the vehicle heat shield structure of this embodiment, as shown in FIG. 1, a motor fan 30 as a blower is provided at the front side of the transmission 6 in the vehicle front-rear direction.

  As shown in FIG. 4, the motor fan 30 has a rotating fan 31 that is pivotally attached to the rotating shaft 31 by an electric motor (not shown) with the rotating shaft 31 as a rotation center. It is comprised so that ventilation may be performed toward a direction.

  And the transmission control cables 23 and 23 wired in the said space part 20 are comprised so that it may contact | abut to the air flow generated by this ventilation.

  Next, the effect of the vehicle heat shield structure according to this embodiment will be described. The catalyst heat shield 11 is located between the transmission control cables 23 and 23 to which the front end portions 23 a and 23 a are attached to the transmission 6 connected to the engine 5 and the catalytic converter 10. .

  The catalyst heat shield plate 11 blocks the transmission of heat generated by the catalyst 10a of the catalytic converter 10 and the radiant heat from the catalyst 10a, thereby protecting the transmission control cables 23 and 23 from thermal damage.

  Further, the air flow from the vehicle front of the transmission 6 is guided by the guide portion 11 c of the catalyst heat shield plate 11 and the guide surface portions 28 a and 28 b of the upper surface side bracket member 28, so that the inside of the floor tunnel portion 14. Is directed toward the transmission control cables 23, 23 arranged in the cable.

  For this reason, of the transmission control cables 23 and 23 in which the front end portions 23a and 23a are attached to the transmission 6, the air contacts the portion routed in the space portion 20 in the floor tunnel portion 14. Thus, the temperature increase is positively suppressed, and a heat shield plate structure for a vehicle having good heat shield efficiency is provided.

  Further, in this embodiment, as a functional component, the wire harness member 24 and the sensor device 25 arranged on the upper surface portion 6a of the transmission 6 are connected to the catalytic converter 10 by the shielding portion 11b of the catalyst heat shield plate 11. It is cut off so as not to be easily affected by the heat generated in the catalyst 10a.

  The wire harness member 24 and the sensor device 25 are sandwiched by the guide portion 11 c of the catalyst heat shield plate 11 and the guide surface portions 28 a and 28 b of the upper surface side bracket member 28, and the cooling increased by the motor fan 30. Since the wind is positioned in the air flow path to be blown, the temperature rise is positively suppressed and the heat shielding efficiency is further improved.

  Further, as shown in FIG. 3, an exhaust pipe heat shield plate 15 is provided between the lower surface side 14 a of the floor tunnel portion 14 and the exhaust pipe 16.

  The exhaust pipe heat shield plate 15 covers the exhaust pipe 16 while being spaced apart from the upper portion of the exhaust pipe 16, and in a space portion 20 formed between the exhaust pipe heat shield plate 15 and the lower surface side 14 a of the floor tunnel portion 14. The transmission control cables 23, 23 that are routed are blocked so that heat generated in the exhaust pipe 16 and radiant heat from the exhaust pipe 16 are not transmitted.

  For this reason, the transmission control cables 23 and 23 are protected from heat damage of the exhaust pipe 16.

  Further, the exhaust pipe heat shield plate 15 has the transmission control cables 23, 23 inserted through the space portion 20 along the lower surface side 14a by the mounting bracket member 27 and the lid member 26. The upper surface side 15b is positioned so as to be spaced from the portion.

  For this reason, when the air flow from the vehicle front of the transmission 6 is guided into the space portion 20 by the arrangement position of the guide portion 11c of the catalyst heat shield plate 11, the air blown can be sufficiently circulated. This opening area can be provided in this space portion 20.

  Therefore, in FIG. 1, the control unit 21, the lid member 26, and the transmission control cables 23, 23 are provided on the vehicle body floor panel member 13 up to the vicinity of the position where the control unit 21 of the shift lever member 22 is provided. In addition, the heat insulation efficiency can be further improved by bringing the blown air into contact and positively suppressing the temperature rise.

  Further, in the vehicle heat shield structure of this embodiment, as shown in FIG. 1, a motor fan 30 as a blower is provided at the front side of the transmission 6 in the vehicle front-rear direction.

  In the motor fan 30, the blower fan member 32 pivotally attached to the rotating shaft 31 is rotated by the rotational drive of the electric motor, and air is blown in the vehicle rearward direction.

  Then, as shown by white arrows in FIG. 4, the air passing through the side surface of the engine head 5b of the engine 5 and the vicinity of the upper surface portion 6a of the transmission 6 is sent to The sensor device 25 is cooled, and the temperature rise is suppressed.

  The transmission control cables 23, 23 extending from the upper surface 6 a and routed in the space 20 are shielded by the catalyst heat shield 11 and the exhaust pipe heat shield 15. .

  The outer peripheral surfaces of these transmission control cables 23 and 23 come into contact with the air flow generated by the air blown by the motor fan 30 and are forcibly cooled.

  For this reason, functional parts, such as the said transmission control cables 23 and 23, the wire harness member 24, and the sensor apparatus 25, can be efficiently cooled using the air blower of engine auxiliary machines, such as a radiator, as the said motor fan 30. FIG.

  Therefore, it is not necessary to provide a separate blower for these functional components, so that the component efficiency and layout efficiency can be improved.

  The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration is not limited to this embodiment, and design changes that do not depart from the gist of the present invention are not limited to this embodiment. Included in the invention.

  That is, in the embodiment, the exhaust pipe heat shield plate 15 is provided between the lower surface side 14a of the floor tunnel portion 14 and the exhaust pipe 16, and the exhaust pipe heat shield plate 15 Although the space portion 20 is formed on the lower surface side 14a of the floor tunnel portion 14, the present invention is not limited to this.

  For example, if the air flow is guided toward the functional parts such as the transmission control cables 23 and 23 arranged in the floor tunnel portion 14, the exhaust pipe heat shield plate 15 is not provided. In addition, the shape, quantity, and material of the guide portion 10c of the catalyst heat shield plate 10 and the exhaust pipe heat shield plate 11 are not particularly limited.

  Further, in the vehicle heat shield structure according to this embodiment, as shown in FIG. 1, a motor fan 30 as a blower is provided at the front side of the transmission 6 in the vehicle front-rear direction. Not exclusively.

  For example, the blower fan member 32 may be configured to rotate by transmitting the rotational driving force of the crankshaft 5a of the engine 5, and the blower rotational drive source, mounting position, mounting angle, shape, quantity and The configuration of the material or the like is not particularly limited.

DESCRIPTION OF SYMBOLS 1 Vehicle 3 Engine room 5 Engine 5c Exhaust port 6 Transmission 10a Catalyst 11 Catalyst heat shield 11c Guide part 12 Dash panel (rear wall part of engine room)
13 Car body floor panel member 14 Floor tunnel part 14a Lower side (floor tunnel part upper surface)
15 Exhaust pipe heat shield 16 Exhaust pipe 20 Space 23 Transmission control cable (one of functional parts)
24 Wire harness member (one of functional parts)
25 Sensor device (one of functional parts)
30 Motor fan (blower)

Claims (3)

A heat shield structure of a vehicle in which a catalyst is disposed between a rear exhaust engine and a dash panel forming a rear wall portion of an engine room in which the engine is housed,
A catalyst heat shield is provided between a functional component mounted on a transmission connected to the engine and the catalyst,
The functional component is routed from the transmission to a floor tunnel portion formed from the dash panel toward the rear of the vehicle, and the catalyst heat shield is directed toward the functional component of the floor tunnel portion, A heat shield structure for a vehicle having a guide portion for guiding an air flow. In the floor tunnel portion, a routed transmission control cable as the functional part, an exhaust pipe extending along the vehicle front-rear direction in the floor tunnel portion, and an exhaust pipe shielding covering the upper portion of the exhaust pipe are provided. A heat plate, and the transmission control cable is inserted into a space portion formed between the exhaust pipe heat shield plate and the upper surface of the floor tunnel portion, and the transmission portion is inserted into the space portion by the guide portion. The vehicle heat shield plate structure according to claim 1, wherein the catalyst heat shield plate is arranged so as to guide an air flow from the front of the vehicle. The heat shield structure for a vehicle according to claim 1 or 2, wherein a blower is provided at a front position in the vehicle longitudinal direction of the transmission.

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