JP4802880B2 - Heat shield mounting structure - Google Patents

Description

  The present invention relates to a heat shield mounting structure for covering an upper side of an exhaust pipe system below a floor panel of a vehicle body.

  In an automobile powered by an internal combustion engine, an exhaust pipe system is routed in the vehicle front-rear direction below the floor panel of the vehicle body. By covering the upper side of this exhaust pipe system with a heat shield, the radiant heat affects the floor panel. (See, for example, Patent Document 1).

In this case, the heat shield plate is composed of a plurality of sheets arranged along the wiring direction of the exhaust pipe system, and the mounting portion of each heat shield plate is a stud bolt protruding from the floor panel side, that is, the vehicle body side. It is inserted and secured with a nut.
JP 2004-324474 A (Page 4, FIGS. 1 and 4)

  By the way, since the front end part is located in the dash panel vicinity among the heat shield plates arranged in front of the vehicle among the plurality of heat shield plates, for example, as shown in FIG. A mounting portion 101 is bent and extended upward at the front end of the foremost heat shield plate 100, and the mounting portion 101 is disposed on the lower front side of the dash panel 102, so that the lower side portion of the dash panel 102 Is fixed as the mounting surface on the vehicle body side, so that the mounting strength of the heat shield plate 100 is increased. For example, the heat shield plate 100 may be detached due to water pressure received when traveling on a flooded road. it can.

  However, in order to fix the front end portion of the heat shield plate 100 to the vehicle body side, the mounting portion 101 is inserted into a stud bolt 103 protruding in the horizontal direction from the dash panel 102 which is the mounting surface on the vehicle body side, and the nut 104 is fixed. become.

  For this reason, when the heat shield plate 100 is attached, as shown in FIG. 8B, the attachment portion 101 is positioned in front of the tip end portion of the stud bolt 103, and the hole portion 105 formed in the attachment portion 101 is formed in the stud. After passing through the bolt 103, the nut 104 is tightened.

  For this reason, a mounting space S wider than the shaft length of the stud bolt 103 is required in front of the dash panel 102, that is, in a direction perpendicular to the mounting surface on the vehicle body side, as indicated by hatching in FIG. For this reason, since no other parts can be arranged in the mounting space S, the front space of the dash panel 102, that is, the space in the engine room cannot be effectively used.

  Accordingly, the present invention provides a heat shield plate mounting that does not require a wide mounting space in a direction perpendicular to the vehicle body side mounting surface by allowing the mounting portion of the heat shield plate to be mounted from the direction along the vehicle body side mounting surface. Provide structure.

In the present invention, the mounting portion projecting upward at the longitudinal end of the heat shield covering the upper side of the exhaust pipe system disposed below the floor panel of the vehicle body is provided on the vehicle body on the front surface of the dash panel. In a heat shield plate mounting structure that is attached to a fixed shaft protruding in a horizontal direction from the side mounting surface, a hole portion that fits the heat shield plate mounting portion to the fixed shaft, and a peripheral edge of the hole portion The most main feature is that a notch part is formed in the part to allow the fixed shaft to pass through the hole part and is formed in a hook shape.

  According to the present invention, since the mounting portion of the heat shield plate is formed in the hook shape by the hole portion and the notch portion, when mounting the mounting portion to the fixed shaft, the mounting portion is oriented in the direction along the vehicle body side mounting surface. By passing the fixed shaft through the notch while being moved, the hole can be fitted into the fixed shaft.

  Therefore, by moving the attachment portion in the direction along the vehicle body side attachment surface, the hole portion can be fitted and attached to the attachment shaft. Therefore, it is necessary to provide a wide attachment space in the direction perpendicular to the vehicle body side attachment surface. Disappear.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 to 4 show a heat shield plate mounting structure according to a first embodiment of the present invention. FIG. 1 is a perspective view of a floor panel provided with a heat shield plate as viewed obliquely from above. FIG. FIG. 3 is an enlarged perspective view of the plate viewed from diagonally above, FIG. 3 is a perspective view of the mounting portion of the heat shield plate viewed from diagonally below, and FIG.

  As shown in FIG. 1, an unillustrated exhaust pipe system including a catalytic converter, a muffler, and the like is disposed below the floor panel 1, and the exhaust pipe is disposed at the center of the floor panel 1 in the vehicle width direction. A tunnel portion 2 for routing the system is formed in the vehicle front-rear direction. A floor panel 1 shown in FIG. 1 is a front floor panel provided in the front part of the vehicle interior.

  A plurality of heat shield plates 10, 11,... Are disposed inside the tunnel portion 2 so as to cover the upper side of the exhaust pipe system and shield the radiant heat of the exhaust pipe system. The influence on the floor panel 1 is suppressed.

  The plurality of heat shield plates 10, 11,... Are each formed in an inverted U-shaped cross section and are aligned in the vehicle front-rear direction so as to cover the upper side of the exhaust pipe system. The present invention is applied to the heat shield plate 10 arranged in the above.

  The foremost heat shield plate 10 has a front end portion 10a that is slightly offset in the vehicle width direction with respect to the general portion 10d due to the layout of the exhaust pipe system, and is positioned below the dash panel 3. The four attachment parts, the attachment part 12 provided on the front end part 10a, the attachment parts 13 and 14 provided on both sides of the general part 10d, and the attachment part 15 provided on the rear end part 10b. Thus, the heat shield plate 10 is fixed to the vehicle body side. The mounting portion 15 is fixed to the vehicle body side together with the heat shield 11 at the rear stage.

  The attachment portion 12 of the tip portion 10a is bent and raised substantially upward along the dash panel 3, and the attachment portions 13 and 14 of the general portion 10d are folded substantially horizontally along the floor panel 1. The former mounting portion 12 is bent and the front surface of the reinforcing plate 4 provided on the dash panel 3 is used as a vehicle body side mounting surface, and the stud bolt as a fixed shaft is installed in the reinforcing plate 4 in the horizontal direction toward the front. 5 and the latter mounting portions 13 and 14 are fixed to stud bolts (not shown) suspended from the floor panel 1.

  Here, in the present embodiment, the foremost mounting portion 12 is provided with a hole portion 12a fitted into the stud bolt 5 as shown in FIGS. 2 and 3, and a peripheral portion of the hole portion 12a. A notch 12b that is formed and allows the stud bolt 5 to pass therethrough is formed in a hook shape. The notch 12b is formed toward the opposite side of the center 10C of the heat shield plate 10 with respect to the stud bolt 5.

  The center 10C of the heat shield plate 10 is a position in the vehicle width direction of the heat shield plate 10 formed in an inverted U-shaped cross section, and on the lower surface of the heat shield plate 10 when traveling on a flooded road or the like. When a large push-up force F acts upon receiving water pressure, the push-up force F is defined as a neutral line that is uniformly distributed on both the left and right sides in the vehicle width direction.

  For example, in the case of a heat shield plate having an inverted U-shaped cross section formed substantially line-symmetric in the vehicle width direction, when the push-up force F acts on the lower surface of the heat shield plate due to water pressure, it is substantially The force is evenly distributed. At this time, the center of the heat shield is the axis of symmetry.

  Then, as shown in FIG. 3, after fitting the hole 12a into the stud bolt 5, the fixing clip 6 as an engaging member that engages with the stud bolt 5 and prevents the mounting portion 12 from being removed is connected to the stud bolt. 5, the mounting portion 12 is sandwiched between the fixing clip 6 and the reinforcing plate 4 by being pressed against the mounting portion 12 as shown in FIG. 4.

  The fixing clip 6 is fitted to the stud bolt 5, and the movement of the stud bolt 5 in the base direction is easily allowed by the spring force of the fitting portion, but the movement in the pulling direction is prevented. It has become.

  Further, as shown in FIG. 3, the position of the hole 12a of the mounting portion 12 is offset by a predetermined amount L from the center 10C of the heat shield plate 10 to the formation side (left side in the drawing) of the notch 12b. is there.

  With the above structure, according to the mounting structure of the heat shield plate 10 of the present embodiment, the mounting portion 12 of the heat shield plate 10 is formed in the hook shape by the hole portion 12a and the notch portion 12b. When attaching to the bolt 5, the stud bolt 5 is passed through the notch 12 b while moving the mounting portion 12 in the direction along the reinforcing plate 4 of the dash panel 3, that is, in the vehicle width direction. The hole 12a can be fitted.

  Therefore, the hole 12a can be fitted and attached to the stud bolt 5 by moving the attachment portion 12 in the direction along the reinforcing plate 4, so that the attachment portion 12 of the heat shield plate 10 can be attached. There is no need to provide a wide mounting space in the direction perpendicular to the reinforcing plate 4, that is, in front of the vehicle.

  For this reason, since another functional component can be directly attached to the front portion of the reinforcing plate 4, that is, the front surface of the dash panel 3, a narrow engine room space can be used effectively.

  Further, the hole 12a of the mounting portion 12 is provided by being offset with respect to the center 10C of the heat shield plate 10, and the notch portion 12b through which the stud bolt 5 passes is a hole on the opposite side to the center 10C of the heat shield plate 10. Since it is formed on the peripheral portion of the portion 12a, when traveling on a flooded road or the like, when the large push-up force F is applied to the lower surface of the heat shield plate 10 due to water pressure, the stud bolt 5 is opposite to the notch portion 12b. Therefore, it is possible to prevent the attachment portion 12 from being detached from the stud bolt 5.

  Specifically, when traveling on a flooded road or the like as shown in FIG. 4, when a large push-up force F is applied to the lower surface of the heat shield plate 10 due to water pressure, the center 10 C of the heat shield plate 10 is used as a reference. The left side force Fa and the right side Fb are uniformly distributed. On the other hand, when the hole 12a of the attachment portion 12 is taken as a reference, the hole 12a is offset by a predetermined amount L on the left side in the drawing with respect to the center 10C of the heat shield plate 10, and therefore the hole 12a in the drawing. The force fb on the right side in the figure is larger than the force fa on the left side. Thereby, while being on the center 10C side of the heat shield plate 10 of the mounting portion 12 and on the side opposite to the notch portion 12b of the mounting portion 12, the left side in the vehicle width direction (right to left in the drawing) is pressed against the stud bolt 5. It is possible to prevent the moment M from being generated and the mounting portion 12 from being detached from the stud bolt 5.

  5 to 7 show a second embodiment of the present invention, in which the same components as those in the first embodiment are denoted by the same reference numerals and redundant description is omitted, and FIG. The perspective view which looked at the attachment part from diagonally downward, FIG. 6 is a front view which shows the attachment state of a heat shield, and FIG. 7 is an expanded sectional view along the AA line in FIG.

  The heat shield plate mounting structure of the present embodiment is basically the same as that of the first embodiment, and the mounting portion 12 provided at the front end portion 10a of the heat shield plate 10 includes a hole portion 12a, a notch portion 12b, and the like. Is inserted into the stud bolt 5 projecting from the reinforcing plate 4 of the dash panel 3 through the notch 12b and the hole 12a is fitted, and the mounting portion 12 is connected to the reinforcing plate 4 by the fixing clip 6. It is attached between them. Of course, the notch 12b is formed toward the opposite side of the center 10C of the heat shield plate 10 with respect to the stud bolt 5.

  In particular, the present embodiment is mainly different from the first embodiment in that an upright piece as a locking portion that is locked to the fixing clip 6 on the peripheral edge portion of the mounting portion 12 on the side where the notch portion 12b is formed. 12c is bent.

  Therefore, according to the mounting structure of the heat shield plate 10 of the present embodiment, the mounting portion 12 moves in the opposite direction (in the direction of the arrow X in FIG. 7) to the notch portion 12b due to road surface vibration or the like, and the stud bolt 5 is notched. When trying to pass through the portion 12 b, the upright piece 12 c is locked to the fixing clip 6, so that the stud bolt 5 is prevented from passing, and thus the mounting portion 12 is reliably prevented from being detached from the stud bolt 5. be able to.

  Further, even in the present embodiment, the position of the hole 12a of the mounting portion 12 is offset by a predetermined amount L on the formation side of the notch 12b with respect to the center 10C of the heat shield plate 10 as shown in FIG. Thus, when water pressure is applied to the heat shield plate 10, the side opposite to the notch 12b of the mounting portion 12 is more strongly pressed against the stud bolt 5, and the stud bolt 5 is more reliably removed from the notch 12b. It can be prevented.

  By the way, the present invention has been described by taking the first and second embodiments as examples. However, the present invention is not limited to these embodiments, and various other embodiments can be adopted without departing from the gist of the present invention. For example, the fixed shaft is not limited to the stud bolt 5 and may be any shaft body that can engage the fixed clip 6, and the engaging member is not limited to the fixed clip 6 and is a nut that is screwed into the stud bolt 5. It may be.

The perspective view which looked at the floor panel in which the heat shield in 1st Embodiment of this invention was provided from diagonally upward. The expansion perspective view which looked at the heat-shielding board in 1st Embodiment of this invention from diagonally upward. The perspective view which looked at the attachment part of the heat shield in 1st Embodiment of this invention from diagonally downward. The front view which shows the attachment state of the heat shield in 1st Embodiment of this invention. The perspective view which looked at the attachment part of the heat shield in 2nd Embodiment of this invention from diagonally downward. The front view which shows the attachment state of the heat shield in 2nd Embodiment of this invention. The expanded sectional view along the AA line in FIG. Sectional drawing which shows the attachment structure of the conventional heat shield in the attachment completion state of (a) and the attachment start state of (b).

Explanation of symbols

1 Floor panel 4 Dash panel reinforcement (vehicle body side mounting surface)
5 Stud bolt (fixed shaft)
6 Fixing clip (engaging member)
10 Heat shield plate 10C Center of heat shield plate 12 Mounting portion 12a Hole portion 12b Notch portion 12c Standing piece (locking portion)

Claims (3)

A mounting part that protrudes upward from the longitudinal end of the heat shield that covers the upper side of the exhaust pipe system that is located below the floor panel of the car body extends horizontally from the car body side mounting surface on the front of the dash panel. In the mounting structure of the heat shield that is attached to the fixed shaft that protrudes,
The mounting portion of the heat shield plate is provided with a hole portion that fits into the fixed shaft, and a notch portion that is formed at a peripheral portion of the hole portion and allows the fixed shaft to pass through the hole portion, thereby forming a hook shape. A heat shield plate mounting structure characterized by being formed.   The position of the hole portion of the mounting portion is offset with respect to a substantial center of the heat shield plate, and the cutout portion is formed toward a side opposite to the substantial center of the heat shield plate. 1. A heat shield mounting structure according to 1.   The engaging portion that engages with the fixed shaft and engages with an engaging member that prevents the attaching portion from being removed is formed on a peripheral edge portion of the attaching portion on the side where the notch portion is formed. 3. A heat shield mounting structure according to 1 or 2.

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