JPS5873430A - Construction of undercover in engine compartment - Google Patents

Abstract

PURPOSE:To prevent accumulation of hot air in an engine compartment and eliminate the necessity for using a heat shielding plate, by mounting an undercover to a lower part of the engine compartment, leading out air in the engine compartment to the lower through a control member and providing said control member to a rear end part of the undercover. CONSTITUTION:In an automobile, in which an engine 8, equipped with a radiator 6 and air suction fan 9, is housed in an engine compartment 13 and mounted to a suspension member 10, an undercover 16 is constituted by molding a mounting flange 16a and cover main unit 16b to integral construction, while a rear end of the cover main unit 16b is folded back downward to form a flange 17 used as a control member. This undercover 16 is mounted in such a menner that its front end is jonted to the lower side part of a front cross member 5 while its rear end is jointed to the suspension member 10. In this way, air flows in the engine compartment 13 along the engine 8, and accumulation of hot air can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an undercover structure for an automobile engine compartment, and more particularly to an improved undercover structure that prevents air from stagnation in the engine compartment and improves ventilation.

Vehicles are equipped with an undercover at the bottom of the engine compartment to prevent muddy water from entering from below the engine compartment. There are those shown in Figures 1 to 3. This schematically shows the inside of the engine room 13 provided in the front part of the vehicle 1. The trap inside the engine room 16 is located behind the radigota core support 7 and flows in from the front grille 6. A radiator 6 that receives air and an engine 8 that has nine fans for sucking air and are installed on a suspension member 10 are disposed.At the bottom of this engine room 13 is an undercarriage whose front end is joined to the front cross member 5. Supports cover 4 and is lacking. The conventional undercover 4 extends from the front cross member 5 to below the front end of the oil pan 14 that covers the lower part of the engine 8 as shown in FIGS. It is an integral structure having mounting flanges 4a on both left and right sides, and a cover main body 4b in the center that hangs down gently from the front end to the rear end. In the figure, numeral 2 is a hood panel, numeral 11 is a darts lower panel, and numeral 12 is a bumper.

However, in such a conventional engine room undercover structure, the rear end of the undercover 40 ends at a place where it extends to the front end of the oil pan 14, so the airflow that has passed through the radiator 6 flows into the engine room. 1
As a result, hot air accumulates at the side of the engine room 13, as shown by reference numeral 15 in Figure 2, and the temperature inside the engine room 13 does not rise, causing the risk of wood burning. was there. For this reason, in some cases, it may be necessary to attach heat plates to various parts installed in the engine room 13 to prevent these parts from deteriorating at high temperatures. There was a problem in that the weight and manufacturing cost increased.

The present invention was developed by focusing on such conventional problems, and its purpose is to be able to regulate the airflow so that it spreads throughout the engine room, and to eliminate the negative effects caused by the airflow in some parts. The purpose is to improve the air circulation performance in the engine room by using an undercover structure in which an undercover provided with a pressure generating part is attached to the lower part of the engine room.

The gist of the present invention is that the undercover is set to have a longer R dimension than conventional ones, so that when it is attached to the vehicle body, it extends to the vicinity of the suspension member or to the rear of the suspension member, and at the rear of the undercover, The present invention is characterized in that a control member is provided that creates a negative pressure region by outside air flowing along the undercover as the vehicle travels. The undercover extends to the bottom of the oil pan located at the bottom of the engine.
It is possible to have an open structure with the rear end becoming a free end near the suspension member, or alternatively, the suspension member D extends further to the rear dash cross member and is fixed to the vehicle body panel at this part. There may be. “The control member installed at the rear of the undercover may consist of a flange that protrudes downward from the rear end of the undercover and is bent, or an opening may be formed by removing a portion of the rear end of the undercover. However, various configurations can be considered, such as one in which several rows of loopers are arranged within this opening.By adopting an undercover structure having such a configuration, the air flow flowing into the carrot room from the 70-inch grill can be reduced. It is possible to guide the air to a rear position of the engine room, and to draw it downward in the engine room by the action of the negative pressure created by the air flow control member that has reached this rear position, and to flow it out to the outside.

This makes it possible to create a flow of air throughout the engine room, and prevents hot air from accumulating in some places in the engine room and causing deterioration in the performance of various parts.

Embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 to 6 are diagrams showing a first embodiment of the present invention. The engine room undercover structure according to the embodiment is formed by joining and fixing the undercover 16t to the vehicle body 1 at the lower part of the engine room 16, which is formed by integrally molding the mounting 7 flange 16m and the cover main body 16b. The front end of the undercover 16 is joined to the lower surface of the front cross member 5, while the rear end is connected to the suspension member 1.
The main body 16b of the main body 16b is bent downward at the rear end thereof to form a control member or flange 17.

With such a configuration, the airflow flowing from the front grille 6 through the radiator 6 into the engine compartment 13 does not flow out from the front lower side of the engine compartment 13, but instead passes through the rear end, i.e., the rear panel. It reaches around 11 parts. Furthermore, muddy water and the like are prevented from entering the engine room from the front side of the engine room 16 by the undercave 16, thereby preventing contamination of the compressor and the like disposed on the j1 engine 80F side. Further, while the vehicle is running, the wind flowing under the engine compartment 16 generates a negative pressure region at the rear of the seven lunges 17 due to the action of the seven lunges 17 . This negative pressure guides the airflow that has reached the vicinity of the rear end wall in the engine room 16 downwards as shown by the arrow T1 in FIG. suck it out. Thereby, the hot air accumulated in the rear part of the engine room 13 is sucked out, and the air temperature in that part is lowered. Therefore, there is no need to attach heat shield plates to various parts arranged at the ridge position of the engine room 13.
FIG. 3 is a diagram illustrating reduction in vehicle weight, etc. The undercover structure of the engine room according to this embodiment is formed by joining and fixing an undercover 16 to the vehicle body 1 at the lower part of the engine room 13, which is an integral structure of a mounting lance 18a and a cover main body 18b. Similar to the undercover 16 in the first embodiment, the undercover 18 has a front end joined to the lower surface of the front cross member 5, and a rear end that extends to the rear of the suspension member 10 and to the bottom lower panel 11. It is extended and has an open structure.

However, different from the first embodiment, a plurality of slit grooves 20 extending in the width direction of the under cover 18 are formed in the rear end portion of the under cover 180, and each slit groove 20 is formed in the rear end portion of the under cover 180.
A louver portion 19 protruding downward from the cover body 18b is provided on the front edge of the cover body 18b to constitute a control member.

Once upon a time, the radiator 6tA4 was installed from the front grill 3.
The airflow flowing into the engine room 3 reaches the vicinity of the rear end wall of the engine room 13 without exiting outside the front lower part thereof, and there, due to the action of the control member, the airflow reaches the rear end wall of the engine room 13. It is guided by the negative pressure created on the bottom surface.
It flows out from the engine room 13 as shown by arrow T2 in FIG. Air is circulated throughout the engine room 13 to prevent hot air from accumulating. Also, this under cover 18ri muddy water etc. is in the engine room 16.
prevents entry into the engine compartment from the lower front of the
Prevents contamination of parts such as compressor.

Although the undercover 18 has an open structure at the rear end, the rear end may be brought into contact with the lower surface of the darts lower panel and joined integrally.

In addition, the louver portion 19 provided in the slit groove 20 is connected to the cover body 1.
Although it has an integral structure with 8b, the force (゛゛1 body 18
It may be possible to attach and detach the part b.

As explained above, according to the present invention, the undercover has a longer structure than the conventional one, and a control member is provided at the rear end portion of the undercover to guide air in the engine room downward. As a result, air can be circulated throughout the engine room, making it possible to prevent hot air from accumulating. This eliminates the need to attach a heat-cleaning plate to components that are sensitive to high temperatures, making it possible to simplify the structure, reduce the weight of plants, and reduce manufacturing costs.

[Brief explanation of drawings]

Figures 4 to 1 are plan views showing a conventional example of an engine room undercut 5 structure, and Figure 2 shows the structure of the conventional example shown in Figure 1. Cross-sectional view at vg3
The figure is a perspective view showing the undercover used in the conventional example, FIG. 4 is a plan view of the undercover structure of the engine room according to the first embodiment of the present invention, and FIG. 5 is the first embodiment of the present invention.
FIG. 4 is a cross-sectional view taken along the line v-V in FIG. 4 showing the structure of the embodiment, FIG. Figure 8 shows the second flame of the present invention, ! It is a perspective view showing an undercover used in one example. 1... Vehicle body 6... Front grill 4.1
6.18... Undercover 5... Front cross member 10... Suspension 1 member 17... Flange (control member) 19... Louver part (
Braking member) 20... Slint 44 Patent applicant Nissan Motor Co., Ltd. No. 11 Figure 2 Figure 4 Figure 5 FIJ

Claims (1)

[Claims] An undercover extending from the front cross member position to the suspension member position or the rear position of the suspension member is installed at the bottom of the engine room, and a control member is provided at the rear end of the undercover to guide the air in the engine room downward. An undercover structure in the engine room featuring