JP4573699B2 - Lower body structure of automobile - Google Patents

Description

  The present invention relates to a lower body structure of an automobile that covers an underside of an engine room with an under cover.

A synthetic resin cover panel (under cover) that covers the lower part of the engine room of an automobile is provided with a ventilation duct part made of a porous metal plate on the upper surface, and this duct part is opposed to the lower surface of the engine or transmission for heat resistance. It is known from Patent Document 1 below that the property and the sound insulation are obtained.
Japanese Patent No. 3154282

  By the way, the engine installed in the engine room of the car needs maintenance such as oil change and oil filter change, but if the lower part of the engine room is covered with an under cover, the under cover must be removed. There is a problem that convenience is lost because the maintenance cannot be performed.

  The present invention has been made in view of the above circumstances, and an object thereof is to facilitate maintenance in an engine room while covering the lower part of the engine room with a heat-resistant under cover.

In order to achieve the above object, according to the first aspect of the present invention, the under cover that covers the lower portion of the engine room is detachably fixed to the synthetic resin main body and the opening formed in the main body. was constituted by a metal lid that faces the high heat in the engine room Te, a vehicle body lower structure of the motor vehicle, the lid, one end of the lid is engaged with uneven engagement the edge of said opening In addition, the outer peripheral portion of the lid excluding the one end is fixed with bolts to the edge of the opening at a plurality of locations spaced in the circumferential direction, and corresponds to the plurality of locations on the outer peripheral portion of the lid. A plurality of nut holders having a U-shaped cross section welded to the upper surface are welded to the edge of the opening, and the outer periphery of the lid, the edge of the opening, and the nut holder are connected from below. The bolt that penetrates upward Underbody structure for an automobile, characterized in that fastened to the weld nut is proposed.

  In addition, the exhaust pipe 15 of an Example respond | corresponds to the high heat source of this invention.

According to the configuration of the first aspect, the metal lid that is detachably fixed to the opening formed in the synthetic resin main body of the under cover that covers the lower part of the engine room faces the high heat source in the engine room. In addition to preventing the main body of the undercover from being damaged by a high heat source, it is possible to perform maintenance in the engine room by simply removing the lid without removing the entire undercover. In addition , one end of the lid is unevenly engaged with the edge of the opening of the main body , and the outer periphery of the lid except for the one end is bolted to the edge of the opening at a plurality of locations spaced in the circumferential direction. because it is fixed with bets, it is easy removable even if such hits deformation stone. Further, a plurality of U-shaped nut holders welded with weld nuts are fitted to the upper edge of the opening of the main body, and the outer periphery of the lid, the edge of the opening and the nut holder are moved downward. Since the bolt that penetrates upward from the bolt is fastened to the weld nut, by supporting the weld nut using such a nut holder, the fastening force of the bolt is dispersed to prevent the body portion made of synthetic resin from being damaged. be able to.

  Hereinafter, embodiments of the present invention will be described based on examples of the present invention shown in the accompanying drawings.

  1 to 9 show an embodiment of the present invention. FIG. 1 is a plan view of the under cover, FIG. 2 is a perspective view of the under cover, and FIG. 3 is an enlarged sectional view taken along line 3-3 in FIG. 4 is an enlarged sectional view taken along line 4-4 in FIG. 1, FIG. 5 is an enlarged sectional view taken along line 5-5 in FIG. 1, FIG. 6 is an enlarged sectional view taken along line 6-6 in FIG. 8 is an enlarged sectional view taken along line 8-8 in FIG. 1, and FIG. 9 is an enlarged sectional view taken along line 9-9 in FIG.

  As shown in FIGS. 1 and 2, the generally flat under cover 11 covering the lower part of the engine room of the automobile has mounting portions 12 a and 12 a that rise upward on the left and right sides of the front side of the synthetic resin main body portion 12. The upper ends of the mounting portions 12a and 12a are fixed to a vehicle body frame (not shown). A detachable metal (aluminum in the embodiment) lid 13 is provided between the left and right mounting portions 12a, 12a of the main body 12, and a metal (aluminum in the embodiment) is provided at the rear end of the main body 12. ) Of the heat shield panel 14 is fixed. The under cover 11 rectifies the air flow on the lower surface of the engine room to improve aerodynamic performance.

  The lid 13 is provided at a position corresponding to the lower side of the engine E mounted in the engine room. An exhaust pipe 15 as a high heat source connected to the front surface of the engine E and extending rearward of the vehicle body is disposed along the upper surfaces of the lid 13 and the heat insulation panel 14. 12 damage is prevented.

As shown in FIG. 4, a slit 12 c that opens rearward is formed at the front edge of the opening 12 b formed in the main body 12 of the under cover 11, and the front edge of the lid 13 is formed in the slit 12 c. Is fitted from behind. As shown in FIG. 3, nut holders 16 having a U-shaped cross section are fitted to the edge portions of the opening 12 b corresponding to the five surrounding places excluding the front edge portion of the lid 13. Bolts 17 ... passing through upwardly outer periphery from the lower side of the lid 13, the main body portion 1 2 and the nut holder 16 ... through the are fastened weld nuts 18 ... to which is welded to the nut holder 16 ... upper surface of the. Thereby, the lid 13 is fixed so as to cover the opening 12b of the main body portion 12, and the attachment and detachment thereof is easy. Further, since the weld nuts 18 are supported using the nut holders 16, the fastening force of the bolts 17 can be dispersed to prevent the main body 12 from being damaged.

  An oil filter 19 and an oil drain plug 20 are provided on the lower surface of the engine E, and the oil filter 19 and the oil drain plug 20 become visible when the lid 13 is removed from the main body 12 of the under cover 11. Maintenance can be performed without removing 11.

  As shown in FIGS. 1, 2, and 5, air intake ports 21 are formed at three locations in the vicinity of the front edge of the main body 12 of the under cover 11. Each of the air intakes 21 includes a substantially horizontal upper wall 21a, a lower wall 21b that is substantially horizontal and one step lower than the upper wall 21a, and substantially vertical left and right ends that connect the left and right ends of the upper wall 21a and the lower wall 21b. The outside air for cooling is introduced into the engine room as the vehicle travels. The upper wall 21a and the lower wall 21b of the air intake port 21 are connected by a plurality of (four in the embodiment) parallelogram-shaped fins 21d.

  By providing fins 21d at the air intake 21 of the under cover 11, it is possible to prevent snow from entering from the air intake 21 during running on a snowy road and to prevent snow from growing inside the engine room. The cooling performance in the engine room by the air taken in from the air intake 21 can be ensured.

  As shown in FIGS. 1, 2, and 6, a pair of left and right foamed polypropylene cushion blocks 22, 22 are fixed to the front edge of the main body 12 of the undercover 11 by adhesion or the like. The upper surface of each buffer block 22 is in contact with the lower surface of the bulkhead 23 that supports a radiator or the like. When the under cover 11 is directly fixed to a vehicle body structure such as the bulkhead 23 when the front lower surface of the under cover 11 contacts an inclined road surface or a projection on the road surface, the vehicle body structure may be damaged. There is. However, by providing the buffer blocks 22 and 22 between the under cover 11 and the vehicle body structure, the impact received by the vehicle body structure and the under cover 11 can be reduced.

  As shown in FIGS. 1, 2, and 7, the front edge and the left and right side edges of the heat shield panel 14 are fixed to a notch 12 e formed at the rear edge of the main body 12 of the under cover 11 through a plurality of rivets 24. Is done.

  As shown in FIGS. 1, 2, 8, and 9, airflow guide portions 12 d and 14 a that are bent obliquely rearward and upward are formed on the rear edge of the main body portion 12 of the undercover 11 and the rear edge of the heat shield panel 14. Is formed. By deflecting the airflow flowing out from the engine room upward by the airflow guide portions 12d and 14a, the airflow flowing along the lower surface of the undercover 11 is hardly disturbed, and the rectifying effect by the undercover 11 can be secured. .

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. der Ru.

Plan view of under cover Undercover perspective view 3-3 enlarged sectional view of FIG. 4-4 enlarged cross-sectional view of FIG. Fig. 5 is an enlarged sectional view taken along line 5-5 6-6 enlarged sectional view of FIG. 7-7 enlarged cross-sectional view of FIG. FIG. 8 is an enlarged sectional view taken along line 8-8. Fig. 9 is an enlarged sectional view taken along line 9-9 in Fig. 1

11 Undercover 12 Body 12b Opening 13 Lid 15 Exhaust pipe (high heat source)
16 nut holder 17 bolt
18 weld nut

Claims (1)

An under cover (11) covering the lower part of the engine room is detachably fixed to a synthetic resin main body (12) and an opening (12b) formed in the main body (12), so that a high heat source ( 15) a lower body structure of an automobile configured with a metal lid (13) opposed to 15) ,
The lid (13) has one end of the lid (13) is engaged with uneven engagement the edge of said opening (12b), said lid (13), the outer peripheral portion excluding the one end, the circumferential direction is bolted (17) to the edge of the opening (12b) at spaced plural locations to,
A plurality of nut holders (16) having a U-shaped cross section with weld nuts (18) welded to the upper surface thereof at the edges of the openings (12b) corresponding to the plurality of locations on the outer peripheral portion of the lid (13). The bolt (17) passing through the outer periphery of the lid (13), the edge of the opening (12b), and the nut holder (16) upward from below is connected to the weld nut (18). The vehicle body lower part structure characterized by being fastened to .

Images