JPS58122263A - Under cover of engine room - Google Patents

Abstract

PURPOSE:To improve the effect of cooling an oil pan, etc. by a constitution wherein an opening letting the outside air flow to the rear of an engine is made in the part under the engine of an under cover which is arranged in extension from a front cross member to the under rear of the engine. CONSTITUTION:An embossed part 21 is provided in the rear of the part under an engine 2 of an under cover C which is arranged in extension from a front cross member 1 to the under rear of the oil pan 4 of the engine 2. This embossed part 21 has a vertical wall 21a at the front end and a guide wall 21b continuing from the front end to the rear end. Moreover, an opening 22 is made in the vertical wall 21a of the embossed part 21 along the entire width of the wall 21a. While a car runs, part of an air stream T1 below the under cover C is led from said opening 22 into an engine room R, and simultaneously, an air stream T2 passing a radiator 3 is induced by said air stream T1 into the rear of the engine 2 through a space 10 between the oil pan 4 and the under cover C.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of an undercover disposed in a lower part of an engine room.

In general, this type of undercover C is used to prevent splashes and the like from entering the engine compartment R and to rectify the air flowing under the vehicle body, as shown in Figures 1 and 2. It is attached to the bottom of R.

As shown in Fig. 2, the conventional undercover C is made of a plate that extends from the front cross member 1 position to near the bottom of the engine 2, and protects the engine 2, radiator 6, etc. from splashing from the tires. Reliably prevents adhesion. In Figures 1 and 2, 4 is an oil pan disposed at the bottom of the engine 2, 5 is a radiator grill, 6 is a bumper, 7 is an apron fixed to the front cross member 1, and 8 is a hood. , 9 is a radiator core support.

However, in such a conventional undercover, the undercover C has a structure that blocks the lower part of the engine 2, so the air flow T1 passing through the lower part of the engine room R is limited to the undercover. The cover C acts as a hindrance and does not enter the engine room R, but instead flows to the rear of the engine room R. As a result, the oil pan 4 and the like are insufficiently cooled, causing the engine oil to reach a high temperature, completely reducing the cooling function of the engine, and causing the oil to deteriorate more quickly. Further, since the undercover C is generally disposed close to the lower part of the engine 2, that is, the lower part of the oil pan 4, the gap 10 between the undercover C and the oil pan 4 is The gap 10 is narrow, and the ventilation resistance in this gap 10 is large. Therefore, the air flow T2 that has passed through the radiator 3 is
0 to the rear side of the engine 2, which not only makes it difficult to use the cooling air from the radiator 6 as cooling air for the oil pan 4, but also makes it difficult to use the cooling air from the radiator 6
The air flow that has passed through the radiator 2 remains in the front part of the engine 2, which also leads to a reduction in the cooling air volume of the radiator 6.

The present invention has been made based on the above-mentioned viewpoints, and its purpose is to focus on the fact that the running wind that passes through the entire lower part of the engine room is a high-pressure air flow, and to By guiding high outside air to the rear of the engine,
An undercover for the engine room that directs the cooling function of the oil pan, etc. located at the bottom of the engine, and also sucks in air that has accumulated in front of the engine to increase the cooling air flowing to the radiator. It is about providing.

The gist of the present invention is an undercover of an engine room having an opening, which is opened at the lower rear part of the engine from the front cross member position to the lower part of the engine and guides outside air to the rear of the engine.

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

In the first embodiment row shown in FIG. 3, the present invention is applied to a vehicle equipped with a horizontal type engine 2t). In this embodiment, the undercover C is plate-shaped and extends from the front cross member 1 position to the lower part of the engine 2, that is, to the rear of the lower part of the oil pan 4.
It is arranged close to the lower part of the engine 2.

An embossed part 21 that extends across the entire width of the undercover C and projects downward is formed at the rear of the lower part of the engine 2 of the upper undercover C. It has a vertical wall 21a, and
Guide wall 2 that runs smoothly from the front end to the rear end
1b. And the sag of the embossed part 21!
@21a has an opening 22 that extends across the entire width of the vertical wall 21a.

Therefore, according to the engine room undercover according to this embodiment, when the vehicle is running, the air flow TI passing through the lower part of the engine room R moves to the rear of the heavy object while maintaining a positive pressure state, and a part of the airflow TI passes under the undercover. The embossed portion 21 of the cover C hits the vertical wall 21a. At this time, a part of the airflow T1 is
The engine 2 is guided into the engine room R through the opening 22 and along the guide wall 21b of the embossed part 21.
flows towards the rear. Therefore, the engine oil is reliably cooled without the need for the oil pan 4 disposed at the bottom of the engine 2 to be directly cooled by the flowing outside air.

In addition, since the outside air from the opening 22 is guided to the rear of the engine 2 with high pressure, this outside air causes
A suction effect occurs in the gap 10 between the undercoat C and the engine 2, and the airflow T2 that has passed through the radiator 6 is drawn toward the rear of the engine 2 through the gap 10. As a result, not only does the radiator 6 cooling air work effectively as cooling air for the oil pan 4, but the air flow T2 that has passed through the radiator 3 no longer stays in the front part of the engine 2, and the radiator 6 At this time, fresh outside air is supplied to improve the cooling effect of the radiator 6.

In this embodiment, since the undercover CFi extends from the front cross member 1 position to the lower rear corner of the engine 2, splashes from tires and the like cannot enter the engine room R, as in the conventional case. Prevented.

Next, a second embodiment shown in FIG. 4 will be described.

The basic structure of the undercover C according to this embodiment is almost the same as that of the first embodiment, but unlike the first embodiment, a flange 23 bent downward is formed at the rear end of the undercover C. has been done.

Therefore, according to the undercover of the engine room according to this embodiment, in addition to producing the same functions and effects as those of the first embodiment, the positive pressure air flow T passing through the lower part of the engine room R is
1 hits the flange 26, the flange 2
Due to the negative pressure behind the undercover C, the undercover C is pulled downward from the rear end of the undercover C, and is sucked out of the vehicle.

As a result, the air in the engine room R is reliably expelled from the vehicle without being retained in the rear part of the engine 2, and a situation where the engine leaks is avoided.

Note that the opening 22 formed in the undercover C is not limited to that shown in each of the above embodiments;
It may be installed in any location as long as it is installed in the lower part of the engine 2 and allows outside air to be introduced to the rear of the engine 2. Further, in each of the embodiments described above, the outside air flowing through the opening 22 is described as cooling air for the oil pan 4, but it goes without saying that it also works as cooling air for parts such as the transmission unit. Furthermore, although the present invention is applied to a horizontal type engine-equipped vehicle in each of the two examples, it goes without saying that the present invention can also be applied to a vertical type engine-equipped vehicle.

As described above, according to the present invention, the undercover of the engine room extends from the front cross member position to the rear of the lower part of the engine, is disposed close to the lower part of the engine, and is opened at a lower part of the engine. Since there is an opening for guiding outside air to the rear of the engine, high pressure outside air can be guided to the rear of the engine without impairing the function of preventing splashes from the tires from entering the engine room. For this reason, it is possible to directly cool the oil pan, etc. disposed at the bottom of the engine by the flowing outside air, and the cooling effect of the oil pan, etc. is improved accordingly. Since all the air accumulated in the front part of the engine can be sucked in and guided to the rear of the engine, the radiator cooling air can be effectively used as cooling air for oil pans, etc., and the amount of cooling air to the radiator can be reduced. can be increased.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an automobile, FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1, showing an example of a conventional engine room undercover, and FIG. FIG. 4 is a sectional view similar to FIG. 2 showing one embodiment, and FIG. 4 is a sectional view similar to FIG. 3 showing an embodiment of the under cover Oa- of the engine room according to the present invention. C... Undercover R... Lower part of the engine
・Front cross member 2...Engine 6...Radiator 4...Oil pan 22...Opening
26...Flange patent applicant: Nissan Motor Co., Ltd. Representative Patent Attorney Kaoru Dobashi Figure 1

Claims (1)

[Claims] An engine room that extends from the front end position of the lower part of the engine room to the rear of the lower part of the engine, is arranged in close proximity to the lower part of the engine, and has an opening that is opened in the lower part of the engine and guides outside air to the rear of the engine. Undercover fly.