JP5300138B2 - Engine undercover for vehicles - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an engine undercover capable of increasing strength without reducing the number of acoustic rooms. <P>SOLUTION: The vehicular engine undercover 10 has the plurality of swelling hollow acoustic rooms 15 on a top face 11 thereof and is formed of a blow molded body having recessed portions 18 between the acoustic rooms 15. Toward a recessed portion 18a between two adjacent acoustic rooms 15a, 15, a protrusion portion 33 swelling upward from a lower surface 31 of the engine undercover is formed. The size of a top portion 34 of the protrusion portion 33 is invaded into the two acoustic rooms 15a, 15 on both sides of the recessed portion 18a. The height of a bottom face 19a of the recessed portion 18a facing the protrusion portion 33 is set to be higher than the height of a bottom face 19b of the other recessed portion 18b not facing the protrusion portion 33, and a summit portion 34 of the protrusion portion is welded to the bottom face 19a of the higher recessed portion 18a. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a vehicular engine undercover having a hollow sound absorbing chamber.

  Conventionally, as shown in FIG. 5, a plate-like engine under cover 70 is provided below the vehicle engine 81 in order to reduce noise caused by the vehicle engine. Reference numeral 80 is an engine room, 83 is a radiator, and 88 is a bumper. In order to improve sound absorption, an engine undercover 75 made of a plastic blow molded body in which a plurality of hollow sound absorbing chambers 77 raised on the upper surface are formed as shown in FIG. 6 has been proposed (for example, Patent Document 1). . Further, in order to increase the strength of the engine undercover made of the blow molded body, as shown in FIG. 7, ribs 93 are erected from the lower surface 91 of the engine undercover 90 made of the blow molded body to form the recess 97 on the upper surface 95. It has been proposed to reinforce by joining the top portions 94 of the ribs 93 (Patent Document 2).

  The engine under cover 90 provided with the ribs 93 is preferably enlarged in order to further enhance the reinforcing effect of the ribs 93 on the lower surface 91. However, when the rib 93 is enlarged, the area of the concave portion 97 of the upper surface 95 to which the top portion 94 of the rib 93 is joined increases, and the number of sound absorbing chambers 99 defined by the concave portion 97 is reduced. There is a problem that the sound absorption of the undercover is lowered. In addition, when the rib 93 on the lower surface 91 of the engine under cover is made larger, the recess 93a on the back side of the rib 93 becomes larger, and the resistance of the air flowing along the lower surface of the engine under cover is reduced when the vehicle is running. There is a problem that the recess 93a on the back side becomes large and adversely affects the running performance of the vehicle.

JP 2002-29330 A Japanese Utility Model Publication No. 62-77052

  The present invention has been made in view of the above-mentioned points. First, it is an object to provide an engine undercover capable of increasing the strength without reducing the number of sound absorbing chambers, and secondly, the number of sound absorbing chambers. An object of the present invention is to provide an engine undercover that can suppress the increase in resistance of air flowing along the lower surface of the engine undercover when the vehicle is running, in addition to increasing the strength without decreasing.

  The invention of claim 1 is a vehicular engine undercover comprising a blow-molded body in which a plurality of hollow sound absorbing chambers protruding on the upper surface are formed and the space between the sound absorbing chambers is a recess, and between two adjacent sound absorbing chambers. A protrusion protruding upward from the lower surface of the engine undercover is formed toward the recess, and the size of the top of the protrusion is sized to protrude into the sound absorption chamber on both sides of the recess, and is opposed to the protrusion. The height of the bottom surface of the recess is made higher than the height of the bottom surface of the other recess not facing the protrusion, and the top of the protrusion is welded to the bottom surface of the raised recess.

  According to a second aspect of the present invention, in the first aspect, the sound absorbing chambers on both sides of the recess are sound absorbing chambers arranged in the width direction of the engine under cover along the width direction of the vehicle, and the protrusions extend in the front-rear direction of the vehicle. It is characterized by a rib shape that is long in the front-rear direction of the engine undercover.

  According to the first aspect of the present invention, the top portion of the protrusion raised upward from the lower surface of the engine under cover toward the concave portion between two adjacent sound absorbing chambers formed on the upper surface of the engine under cover is The height of the bottom surface of the recess facing the protrusion is larger than the height of the bottom surface of the recess between the other sound absorption chambers not facing the protrusion, and the size of the recess protrudes into the sound absorption chamber on both sides of the recess. With the configuration in which the top of the protrusion is welded to the bottom of the raised recess, the protrusion on the lower surface of the engine undercover can be enlarged without reducing the number of sound absorbing chambers, and the engine without reducing sound absorption The strength of the undercover can be increased.

  According to the second aspect of the present invention, the effect of the first aspect, that is, the protrusion of the lower surface of the engine undercover can be enlarged without reducing the number of sound absorbing chambers, and the engine undercover can be reduced without reducing the sound absorption. In addition to the effect of increasing the strength of the cover, the protrusion has a rib shape that is long in the front-rear direction of the engine undercover, so that the recess on the rear surface of the rib-shaped protrusion is along the front-rear direction of the vehicle. Even if the protrusion becomes large, it is possible to suppress an increase in resistance of air flowing along the lower surface of the engine undercover during traveling of the vehicle due to the depression on the back side of the protrusion.

It is a perspective view of the engine undercover concerning the example of the present invention. It is 2-2 sectional drawing of FIG. FIG. 3 is a 3-3 cross-sectional view of FIG. 1. It is the perspective view which notched the upper surface in FIG. It is the schematic which shows the use condition of the conventional engine undercover. It is sectional drawing of an example of the engine undercover which consists of a conventional blow molding. It is sectional drawing of the other example of the engine undercover which consists of a conventional blow molding.

  The engine undercover 10 of the embodiment shown in FIGS. 1 to 4 is made of a plastic blow-molded body formed by known blow molding, and is below the vehicle engine 81 as in the conventional engine undercover shown in FIG. It is arranged. The engine undercover 10 of the present embodiment is formed of a hollow plate-like body and has a size close to the back side of the bumper 88 in front of the radiator 83 from below the engine 81 shown in FIG. 5 and below the radiator 83.

On the upper surface 11 of the engine under cover 10, a plurality of hollow sound absorbing chambers 15 and protruding projections 23 are formed.
The sound absorption chamber 15 is for enhancing the sound absorption of the engine undercover 10 and has a convex hollow shape composed of a side surface and an upper surface. The shape, size, and number of the sound absorbing chambers 15 are determined in consideration of sound absorbing properties. The sound absorbing chambers 15 are arranged in a row in the front-rear direction L of the engine under cover 10 along the front-rear direction of the vehicle, and a plurality of rows are provided in parallel in the width direction W of the engine under-cover 10 along the width direction of the vehicle. A recess 18 is formed between the sound absorbing chambers 15.

  The attachment projection 23 is used when attaching the engine undercover 10 to a vehicle. The mounting projection 23 has a mounting hole 25 formed on the upper surface.

  On the lower surface 31 of the engine under cover, protrusions 33 that protrude upward are formed at a plurality of locations. FIG. 2 is a cross-sectional view at the position of the recess 18 between the sound absorbing chambers 15 arranged in the width direction W of the engine under cover 10. The protrusion 33 is formed in a rib shape that is long in the front-rear direction L of the engine under cover 10 and is formed toward the recess 18 a between the sound absorbing chambers 15 a and 15 a arranged in the width direction of the engine cover 10. The bottom surface 19a of the recess 18a facing the protrusion 33 is formed higher than the bottom surface 19b of the other recess 18b not facing the protrusion 33 (that is, the depth of the recess is shallow). Further, the top 34 of the protrusion 33 protrudes into the two sound absorbing chambers 15a, 15a adjacent to each other in the width direction W on both sides of the recess 18a, and does not block the two sound absorbing chambers 15a, 15a. The size is assumed. The top 34 of the protrusion 33 is welded to the bottom surface 19a of the recess 18a.

  The engine undercover 10 is configured such that the height of the bottom surface 19a of the recess 18a facing the protrusion 33 is higher than the bottom surface 19b of the other recess 18b not facing the protrusion 33, and the protrusion 33. The protrusions 33 of the lower surface 31 are enlarged without reducing the number of the sound absorbing chambers 15 by causing the top portions 34 to protrude into the sound absorbing chambers 15a, 15a adjacent to each other in the width direction W on both sides of the recess 18a. Thus, the strength of the engine undercover 10 can be increased without impairing the sound absorption.

  Further, the engine undercover 10 has a rib shape in which the protrusion 33 is long in the front-rear direction L of the engine undercover 10, so that a recess 35 on the back surface of the protrusion 33 extends along the front-rear direction of the vehicle. Even if the portion 33 becomes large, it is possible to prevent the resistance of the air flowing along the lower surface of the engine undercover 10 during traveling of the vehicle from increasing due to the recess 35 on the back side of the protrusion 33.

DESCRIPTION OF SYMBOLS 10 Engine undercover 11 Upper surface of engine undercover 15 Sound absorption chamber 15a Sound absorption chamber adjacent in the width direction 18, 18a, 18b Recesses 19 between the sound absorption chambers 19, 19a, 19b Bottom surfaces of the recesses 31 Lower surface of the engine undercover 33 Projection 34 Projection The top of the part 35 The depression on the back of the protrusion

Claims (2)

In a vehicle engine undercover made of a blow molded body in which a plurality of hollow sound absorbing chambers raised on the upper surface are formed and the space between the sound absorbing chambers is a recess,
A protrusion protruding upward from the lower surface of the engine under cover is formed toward the recess between the two adjacent sound absorbing chambers,
The size of the top of the protrusion is made to protrude into the sound absorbing chambers on both sides of the recess, and the height of the bottom of the recess facing the protrusion is set to the bottom of the other recess not facing the protrusion. An engine undercover for a vehicle, wherein the top portion of the protrusion is welded to the bottom surface of the raised recess that is higher than the height.   The sound absorbing chambers on both sides of the recess are sound absorbing chambers adjacent to each other in the width direction of the engine under cover along the width direction of the vehicle, and the protrusions have a rib shape that is long in the front and rear direction of the engine under cover along the vehicle front and rear direction. The vehicle engine undercover according to claim 1, wherein:

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