JPS6350431Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an undercover for an automobile that shields noise radiated to the outside from the underside of the engine compartment of the automobile.

Conventional undercovers for automobiles of this type include:
For example, there is one shown in FIG. In the figure, reference numeral 1 denotes an undercover, which is made of a steel plate or the like formed into a dish shape. This undercover 1 is arranged below the engine 2 with a gap between it and the engine 2, and widely covers the lower surface of the engine room up to the vicinity of the transmission 3, and radiates light from the engine 2 and the transmission 3 to the lower part of the engine room. It was attached to the body of a car to block out the noise caused by the noise.

Further, as shown in FIGS. 2 and 3, the undercover 1 has a bottom plate portion 1a that broadly covers the lower surface of the engine room, and is structured to shield radiated sound as effectively as possible.

However, during engine maintenance, driving in the rain, or driving on rough roads, oil, water, etc.
There was a risk that muddy water or the like would enter and accumulate, which would accelerate corrosion of the undercover 1 or cause the oil to ignite and cause a vehicle fire. Also,
In order to prevent the corrosion, the undercover 1 may be made of a material with excellent corrosion resistance.
The material costs were high and there were practical difficulties.

This invention was made by focusing on such conventional drawbacks.It is attached to the car body, has a gap with the engine, covers the lower surface of the engine compartment of the car, and has a bottom plate with a substantially U-shaped cross section pointing downward. ribs are integrally provided that protrude from each other and at least cross each other, a hole is bored in the recess formed by the ribs at the lowest ground clearance position, and a sheet of high damping material is provided. Formed by plate material,
Furthermore, by using an undercover that is directly attached to the vehicle body, the structure is simple and cost-effective, and it also has a great noise shielding effect, and can effectively drain water and oil that have entered the bottom plate. Therefore, the present invention provides an undercover for an automobile that has excellent corrosion resistance.

Hereinafter, embodiments of this invention will be described with reference to the drawings.

4 to 6 specifically show the undercover of this invention. Reference numeral 11 denotes the undercover, which is formed of a single plate made of a high damping material such as synthetic fibers such as rubber, urethane, and nylon. This undercover 11 has the same overall shape as the conventional one, and has a dish-like shape, and the lowest bottom part thereof is a bottom plate portion 11a.

Horizontal ribs 12 and vertical ribs 13 that protrude downward are formed on the bottom plate portion 11a so as to cross each other, and the upper surface of the bottom plate portion 11a having these ribs 12 and 13 is A recess 14 is provided. A plurality of holes 15 are provided in this recess 14 to drain out rainwater etc. that have entered onto the bottom plate portion 11a.

These punch holes 15 are provided in the recesses 14 that are lowest when the undercover 11 is attached to the vehicle body. Note that the larger the drainage hole 15 is, the better the water drainage effect will be, but on the contrary, the sound insulation effect will be impaired, so it is desirable that the diameter be set to a certain small size.
It is desirable to reduce the number as much as possible.

Note that by providing an emboss or the like in the area where the punch hole 15 is located, the position can be made lower than other areas in the recess 14. This can further improve the water removal effect.

Next, we will discuss the effect.

The undercover 11 having the above structure is attached to the vehicle body and covers the lower surface of the engine room, so it blocks noise emitted from the engine 2 and transmission 3 parts to the lower part of the engine room, and serves as a countermeasure against noise pollution. .

In addition, oil and water spilled on the bottom plate portion 11a of the undercover 11 during vehicle maintenance are guided to a lower position in the recess 14 formed by the horizontal ribs 12 and vertical ribs 13 that protrude downward. By immediately discharging the oil to the outside from the hole 15, it has excellent corrosion resistance and prevents oil from burning out due to engine radiant heat.
This can prevent accidents such as vehicle fires.

Further, the conventional undercover 1 is constructed of a single steel plate with a wide surface, and therefore lacks rigidity and is susceptible to resonance when subjected to vibrations from an engine or the like. That is, there is a possibility that the main body vibrates and becomes a source of noise.

However, in this invention, in the undercover 11, the recess 14 that acts as a gutter that guides rainwater and oil to the drain hole 15 is formed by ribs 12 and 13 that cross each other. 13
The undercover 11 improves rigidity not only in the front-rear direction but also in the left-right direction. Since the undercover 11 is attached to the vehicle body, engine vibrations are not directly transmitted. Furthermore, since it is made of a high damping material, the undercover 11 itself Vibrations are suppressed and can be effectively prevented from becoming a source of noise. The shape and size of these ribs 12 and 13 are determined by the under cover 1.
It is determined as appropriate depending on the shape and material of the item 1.

The effects of the present invention are listed below.

In comparison to what is directly attached to the engine,
Since it does not resonate with engine vibration, noise radiated downward into the engine room can be effectively shielded.

By forming the ribs, rigidity is improved, and a high damping material can be used for the undercover, which is larger than an oil pan or the like.

Since the hole is provided at the lowest ground clearance position of the rib, oil etc. will not accumulate, and durability can be ensured even if high damping material is used.

It is obtained by molding a single sheet of plate material, and since it is a high damping material, it does not damage the side to which it is attached, so it can be attached directly to the vehicle body.
Manufacturing costs, especially assembly costs, can be reduced.

It has the following effects and solves various problems that have been a hindrance to the use of conventional high damping materials.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing a conventional undercover mounting structure, Fig. 2 is a plan view of the undercover, Fig. 3 is a sectional view of the undercover shown in Fig. 2, taken along line A-A, and Fig. 4 is The plan view of the undercover of this invention, FIGS. 5 and 6, are B-B in FIG. 4, respectively.
FIG. 3 is a cross-sectional view taken along line B and line C-C. 2...Engine, 11...Undercover, 12
...Horizontal rib, 13...Vertical rib, 14...Recess, 1
5...Extraction hole.

Claims (1)

[Scope of utility model registration request] In an undercover that is attached to the vehicle body and covers the lower surface of the engine compartment of the vehicle with a gap from the engine, the bottom plate portion of the undercover has ribs that protrude downward and have a substantially U-shaped cross section and at least cross each other. is integrally provided, a hole is bored at the minimum ground clearance position of the recess made by this rib, and it is formed from a single plate made of high damping material, and is directly attached to the vehicle body. An undercover for automobiles characterized by the following.