KR20180077616A - Under cover for vehicle and method thereof - Google Patents

Abstract

The present invention relates to an under cover for a vehicle and a manufacturing method thereof, in which rigidity of the under cover is reinforced against vibration and deflection by a vibration reinforcing portion formed on a front portion and a rear portion of a body portion while using an under cover material which is lighter than conventional under cover material. The rigidity of the under cover against deflection is reinforced by a deflection reinforcing portion formed across the front portion and the rear portion of the body portion or formed in the front portion of the body portion. As the rigidity against vibration and deflection is reinforced while reducing the weight of undercover, it is possible to improve the safety and reliability of the under cover and reduce the manufacturing cost and manufacturing time of the under cover. Operator convenience can be improved by facilitating the assembling work for the under cover and fuel efficiency can be improved by reducing the weight of the vehicle.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an under-

The present invention relates to an under cover for an automobile and a method of manufacturing the same. More particularly, the present invention relates to an under cover for an automobile, and more particularly, to a vibration- The rigidity of the under cover is reinforced and the rigidity of the under cover against the deflection is reinforced by the deflection reinforcing portion formed across the front portion and the rear portion of the body portion or formed in the front portion of the body portion, And more particularly, to an under cover for an automobile and a method of manufacturing the same, which can improve the safety and reliability of the under cover as the rigidity against deflection is enhanced and the manufacturing cost and manufacturing time of the under cover can be reduced.

Generally, an under cover is attached to the lower end surface of the automobile. Such an under cover serves to protect the components installed in the lower part of the vehicle including the engine and the transmission. Also, Thereby preventing the liquid from flowing into the inside.

In addition, an under cover of an automobile performs an important function to prevent noise from being transmitted to the outside of the automobile by absorbing or interrupting noise generated in the automobile, particularly, engine and transmission.

During driving, various foreign substances such as pebbles, water, various pollutants are frequently splashed in automobiles or are frequently encountered in automobiles. Especially when passing through a place where the snow is piled on a barrier or winter, the lower part of the vehicle Fatal damage may occur to the engine, transmission and major parts of the vehicle in the engine compartment due to friction with road surface obstructions.

The undercover installed at the lower portion of the vehicle is formed variously according to the shape of the vehicle.

FIG. 1 is a perspective view of an under cover 1 according to an example of the related art. In FIG. 1, a plurality of mounting holes 2 are formed in an under cover 1 for an automobile. Further, the under cover 1 is formed of a steel material or a plastic material. On the upper surface of the under cover (the surface facing the inside of the automobile), a sound absorbing portion made of a material having relatively soft and porous properties may be formed for absorbing sound.

As described above, the under cover of the automobile is required not only excellent absorption / sound insulation performance that can prevent the external propagation of noise, but also high strength enough to sufficiently prevent the external shorting.

In addition, today, in order to improve the fuel efficiency of automobiles by lightening the weight of automobiles, plastic materials are used instead of steel materials to reduce weight.

However, in the conventional automotive undercover, the weight of the under cover is increased due to the use of the under cover base of 1200 g / m 2 (1200 m 2) or 1400 g / m 2 (1400 m 2), thereby increasing the manufacturing cost of the under cover, The manufacturing cost is increased.

For this purpose, in the conventional automotive undercover, 800 g / m 2 (800 sq. M) of undercover base material was used, however, the rigidity against vibration and sagging was lowered and the under cover was attracted to the road surface, There is a problem that the maintenance cost of the automobile increases and the inconvenience of the driver of the automobile increases.

In addition, since the under cover of the conventional automobile uses an under cover base material having a low specific gravity, the rigidity against sagging is lowered, so that the under cover is bent in the longitudinal direction or the width direction during the production of automobiles, There is a problem that the worker can not easily work and inconveniences the worker and increases the manufacturing cost of the automobile according to the increase of the working time.

In addition, since the under cover of the conventional automobile has a reduced rigidity against vibration and deflection, the under cover is damaged during the automobile operation due to obstacles on the road surface, and the other components of the undercarriage are damaged secondarily, And the safety of the vehicle is deteriorated.

In addition, the conventional under cover for automobiles has a problem in that the weight of the under cover can not be reduced, fuel economy of the automobile is deteriorated, the maintenance cost of the automobile increases, and the export is reduced.

Korean Patent Publication No. 10-2004-0052303

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide an under-cover base material which is light in weight, The rigidity of the cover is reinforced and the rigidity of the under cover against the deflection is further reinforced by the deflection reinforcing portion formed across the front portion and the rear portion of the body portion or formed in the front portion of the body portion to reduce the weight of the under cover, And enhances the rigidity against deflection, thereby improving the safety and reliability of the under cover, reducing the manufacturing cost and manufacturing time of the under cover, improving the convenience of the under cover and improving the worker's convenience, Thereby improving the fuel economy, and a method of manufacturing the same.

In order to achieve the object of the present invention, an under cover for an automobile according to the present invention is provided in a lower portion of an automobile to protect a component installed in the automobile, wherein the under cover has a predetermined length A body portion having a front portion having a width and a front portion and a rear portion having a rear portion; A vibration reinforcing portion formed on the front portion and the rear portion of the body portion to reinforce the rigidity of the under cover against vibration; And a deflection strengthening portion formed across the front portion and the rear portion of the body portion or formed at a front portion of the body portion to reinforce the rigidity of the undercover against deflection.

In another preferred embodiment of the under cover for a vehicle according to the present invention, the front portion of the body portion of the automotive under cover includes a front stepped portion formed on one side surface of the rear end of the front portion, And a rear stepped portion that is stepped on one side of a rear end of the rear portion so as to be positioned on the same horizontal line as the front step portion.

In another preferred embodiment of the under cover for a vehicle according to the present invention, the vibration reinforcement portion of the under cover for a vehicle has a certain length, width and height, and extends in the longitudinal direction and the width direction at a portion adjacent to the front end of the front portion. A first vibration-resisting rib that is formed; A second vibration-resisting rib having a predetermined length, a width and a height, and extending from the rear end of the first vibration-resisting rib to a rear end of the front portion in a longitudinal direction and a width direction; And a third vibration-resisting rib having a predetermined length, a width and a height, and extending in the longitudinal direction and the width direction adjacent to the rear end of the rear portion at the front end of the rear portion.

Further, in another preferred embodiment of the under cover for a vehicle according to the present invention, the vibration reinforcement portion of the under cover for a vehicle has a certain length, width and height, 4 vibration reinforcing ribs.

Further, in another preferred embodiment of the under cover for a vehicle according to the present invention, the vibration reinforcement portion of the under cover of the automobile has a certain length, width and height, and is provided at a rear end of the rear portion, And a fifth vibration-enhancing rib extending in the width direction.

Further, in another preferred embodiment of the under cover for an automobile according to the present invention, the slack preventing portion of the under cover of the automobile has a certain length, width and height, and the upper surface of the rear end of the second vibration- And a first sag prevention rib extending in the longitudinal direction across the second vibration-resisting rib and the third vibration-absorbing rib on the upper end surface of the front end of the reinforcing rib.

In another preferred embodiment of the under cover for an automobile according to the present invention, the slack preventing portion of the under cover of the automobile has a certain length, width and height, and the one side of the front portion and the one side of the rear portion, And a second sag prevention rib extending in the longitudinal direction so as to be parallel to the first sag prevention ribs across the rear end of the front portion and the front end of the rear portion.

In another preferred embodiment of the under cover for an automobile according to the present invention, the slack preventing portion of the under cover of the automobile has a constant length, a width and a height, 3 deflection preventing ribs.

In another preferred embodiment of the under cover for an automobile according to the present invention, the width of the first slack prevention ribs of the automotive under cover is smaller than the width of the second vibration strengthening ribs and the width of the third vibration reinforcing ribs .

In another preferred embodiment of the under cover for a vehicle according to the present invention,

In order to accomplish still another object of the present invention, there is provided a method of manufacturing an under cover for an automobile according to any one of claims 1 to 9, (S1) forming an under cover base material in the form of a sheet of LWRT material; (S2) of laminating the nonwoven fabric on the top or bottom of the undercover substrate or on the top and bottom of the substrate of the undercover; Preheating (S3) the nonwoven fabric laminated on the undercover substrate and the undercover substrate; And (S4) molding the nonwoven fabric laminated on the preheated undercover base material and the undercover base material into an under cover in a press.

Further, in another preferred embodiment of the method for manufacturing an under cover for a vehicle according to the present invention, a method for manufacturing an under cover for an automobile is characterized in that after the step (S4) of molding the under cover, And trimming (S5).

In another preferred embodiment of the method for manufacturing an under cover for a vehicle according to the present invention, in the step (S1) of forming an under cover base material for a method for manufacturing an under cover for a vehicle, the resin is selected from the group consisting of polypropylene (PP) (PE), polyarimide (PA), polycarbonate (PC), polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyphenylene oxide (PPO), polyphenylene ether (PEI), or a combination of two or more thereof.

The under cover for automobile and the method of manufacturing the same according to the present invention can enhance the rigidity of the under cover against vibration and deflection by using the vibration reinforcement formed at the front portion and the rear portion of the body portion, And the rigidity of the under cover against the deflection is further reinforced by the deflection reinforcing portion formed across the front portion and the rear portion of the body portion or formed at the front portion of the body portion to reduce the weight of the under cover, It is possible to remarkably improve the durability and strength of the under cover.

Further, the under cover for automobile and the method for manufacturing the same according to the present invention can remarkably improve the rigidity of the under cover while improving the weight of the under cover, thereby increasing stability and reliability, There is an effect.

Further, the under cover for a vehicle and the method for manufacturing the same according to the present invention have the effect of reducing the manufacturing cost and manufacturing time of the under cover, improving the ease of assembly of the under cover, and improving the operator's convenience.

In addition, the under cover for a vehicle and the method for manufacturing the same according to the present invention have an effect of reducing the replacement cost by increasing the service life of the under cover.

Also, the under cover for a vehicle and the method for manufacturing the same according to the present invention prevent damage to the lower parts of the vehicle due to secondary damage due to damage of the under cover during operation of the vehicle due to increase in durability and rigidity, And the fuel efficiency of the automobile can be improved by reducing the weight.

1 shows a plan view of a conventional under cover for automobiles.
2 is a plan view of an under cover for an automobile according to an embodiment of the present invention.
Fig. 3 shows an enlarged view of a portion A in Fig.
Fig. 4 shows an enlarged view of a portion B in Fig.
Fig. 5 shows an enlarged view of a portion C in Fig.
Fig. 6 shows an enlarged view of a portion D in Fig.
Fig. 7 shows an enlarged view of a portion E in Fig.
8 is a graph showing the deformation amount of a conventional automotive under cover and a deformation amount of an automotive under cover according to the present invention with respect to a deformation amount change according to a vibration frequency.
FIG. 9 is a graph showing a deflection amount of a conventional undercarriage for a vehicle and a deflection amount of an undercarriage for a vehicle according to the present invention, with respect to changes in deflection by gravity over time.
10 shows a flow chart of a method of manufacturing an under cover for a vehicle according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings of a prefabricated pillow. The following embodiments are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the present invention is not limited to the embodiments described below, but may be embodied in other forms. In the drawings, the size and thickness of an apparatus may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. However, it should be understood that the present invention is not limited to the embodiments disclosed herein but may be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification. The dimensions and relative sizes of the layers and regions in the figures may be exaggerated for clarity of illustration.

The terminology used herein is for the purpose of describing embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. &Quot; comprise "and / or" comprising ", as used in the specification, means that the presence of stated elements, Or additions.

2 is a plan view of an under cover for an automobile according to an embodiment of the present invention. Fig. 3 is an enlarged view of a portion A in Fig. 2, Fig. 4 is an enlarged view of a portion B in Fig. 2, Fig. 5 is an enlarged view of a portion C in Fig. Fig. 7 shows an enlarged view of a portion E in Fig. 6. Fig. FIG. 8 is a graph showing the amount of deformation of the conventional undercarriage for automobiles and the undercover for automobiles according to the present invention, and FIG. 9 is a graph showing the amount of deformation of the conventional undercarriage And the deflection amount of the under cover for a vehicle according to the present invention. 10 shows a flow chart of a method of manufacturing an under cover for a vehicle according to an embodiment of the present invention.

The definitions of terms used below are as follows. Means the longitudinal direction in the same member, that is, the Y-axis direction in Fig. 2, and the "longitudinal direction" means the lateral direction orthogonal to the width direction, i.e., the X- The "height direction" means a direction orthogonal to the width direction and the longitudinal direction and height direction in the same member, that is, the Z-axis direction in Fig.

As shown in FIG. 2, the under cover according to the present invention is an under cover for covering one side of the automobile from the front to the rear, wherein the left under cover and the right under cover are composed of one set, . In the case of the right undercover, it is formed symmetrically in parallel with the left undercover.

2 to 7, an automotive under cover 10 according to an embodiment of the present invention will be described. 2 to 7, an automotive under cover 10 according to an embodiment of the present invention includes a body 100, a vibration-enhancing part 200, and a deflection reinforcing part 300.

The under cover 10 is installed at the lower part of the automobile by means of a lower part of the automobile and a coupling means such as a bolt and a rivet of the mounting part 11 to protect the parts installed in the automobile and reduce air resistance, Thereby preventing the generated noise from being transmitted to the outside.

Although not limited thereto, the under cover 10 according to an embodiment of the present invention is formed of 800 g / m 2 (800 m 2) of an under cover substrate. In addition, such an under cover substrate is formed in a sheet form of an LWRT material in which a resin is impregnated with glass fiber. According to a preferred embodiment of the present invention, the resin for forming the under cover substrate may be at least one selected from the group consisting of polypropylene (PP), polyethylene (PE), polyarimide (PA), polycarbonate (PC) Is formed of any one or a combination of two or more of polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyphenylene oxide (PPO), polyphenylene ether (PPE) and polyetherimide (PEI).

The body part 100 has a front part 110 having a predetermined length and width and covering the lower part of the automobile and forming the front of the body part 100 and a rear part forming the rear of the body part 100. That is, the body part 100 is similar to the length of the vehicle and has a width similar to half of the width of the vehicle, and the body part 100 corresponds to half of the entire length of the body part and forms the front part of the body part And a rear portion 120 forming a rear portion of the body portion. The body part 100 is formed to have various lengths and widths depending on the type of vehicle.

The vibration enhancing part 200 is formed on the front part 110 and the rear part 120 of the body part to reinforce the rigidity of the under cover 10 against vibration and primary deflection.

The deflection reinforcing portion 300 is formed to extend across the front portion 110 of the body portion and the rear portion 120 of the body portion or to be formed on the front portion 110 of the body portion in order to secondarily reinforce the rigidity of the under cover against deflection. .

As described above, according to the present invention, the under cover of the automobile is reinforced with the rigidity of the under cover against vibration and deflection by the vibration reinforcement formed at the front part and the rear part of the body part while using the under cover base material which is lighter than the conventional under cover And the rigidity of the under cover against the deflection is further reinforced by the deflection reinforcing portion formed across the front portion and the rear portion of the body portion or formed at the front portion of the body portion to reduce the weight of the under cover, The durability and the strength of the under cover can be remarkably improved.

2, the front portion 110 of the body portion of the automotive under cover 10 according to the present invention includes a front step portion 113 formed on the left side surface or the right side surfaces 114 and 115 of the rear end portion 113 of the front portion, And the rear portion 120 of the body portion is stepped on the left or right side surfaces 124 and 125 of the rear end 113 of the rear portion so as to be located on the same horizontal line as the front step portion 111 And includes a rear stepped portion 121. 2, when the under cover is coupled to the left side (left under cover), the front step portion 111 is stepped on the right side surface 115 of the rear portion 113 of the front portion, The rear end 123 of the rear portion is stepped on the right side 125 so as to be positioned on the same horizontal line as the front stepped portion 111. [ Although not shown in the drawings, when the under cover is coupled to the right side (right under cover), the front step portion is stepped on the left rear side of the front portion, and the rear step portion is formed on the same horizontal line as the front step portion And is stepped on the left-hand side of the rear end.

 2, the vibration-enhancing portion 200 of the automotive under-cover 10 according to a preferred embodiment of the present invention includes a first vibration-enhancing rib 210, a second vibration-enhancing rib 220, And a third vibration-enhancing rib 230.

The first vibration reinforcing rib 210 has a predetermined length and a width and a height and has a longitudinal direction X and a lateral direction Y at a portion adjacent to the front end 112 of the front portion and one side 114 and 115 of the front end portion. As shown in FIG. That is, as shown in FIG. 3, the first vibration-enhancing rib 210 is formed in the front portion 110 of the body portion with a predetermined length, width, and height. The front end of the first vibration-reinforcing rib 210 starts at a position adjacent to the front end 112 of the front portion and the left side surface 114 of the front portion and the rear end of the first vibration- 212 extend in the longitudinal direction so as to face the rear end 113 of the front portion. 2 and 3, the under cover is an under cover to which the under cover is coupled to the left side of the automobile. In this case, the first vibration support rib is formed at a position adjacent to the front end of the front part and the left side of the front part. As described later with reference to FIG. 8 and Table 1, the first vibration-enhancing rib 210 performs a function of reinforcing the vibration frequency of the 20 Hz band and the rigidity against the deflection amount.

The second vibration-enhancing rib 220 has a predetermined length, width and height and is spaced apart from the rear end 212 of the first vibration-enhancing rib and extends in the longitudinal direction X And a rear end 113 of the front portion in the width direction Y. [ 2, the second vibration-enhancing rib 210 has a front end 221 of the second vibration-enhancing rib adjacent to the left surface 114 of the front portion, And the rear end 222 of the second vibration-enhancing rib extends in the longitudinal direction so as to be in contact with the rear end 113 of the front portion. 2, the under cover is coupled to the left side of the vehicle. In this case, the second vibration-enhancing rib 220 is formed at the same position as the other parts and adjacent to the right side of the front part. As described later with reference to FIG. 8 and Table 1, the second vibration-enhancing rib 220 functions to reinforce the rigidity of the vibration frequency and the deflection amount of the vibration frequency with respect to the 44 Hz band.

The third vibration-resisting rib 230 has a predetermined length, a width and a height, and is adjacent to one side of the rear portion and starts from the front end 122 of the rear portion and extends in the longitudinal direction X and the width Direction (Y). 2, the third vibration-enhancing rib 230 is disposed adjacent the rear end 222 of the second vibration-enhancing rib and the front end 231 of the third vibration- And extends in the longitudinal direction adjacent to the rear end 123 of the rear portion starting from the front end 122 of the rear portion. 2, the under cover is coupled to the left side of the automobile. At this time, the third vibration-enhancing rib 230 is formed at the other portion of the same and adjacent to the right side of the rear portion. As described later with reference to FIG. 8 and Table 1, the third vibration-enhancing rib 230 performs a function of reinforcing the vibration frequency of the 52 Hz band and the rigidity against the deflection amount.

The first, second, and third vibration-enhancing ribs 210, 220, and 230 are formed in the shape of a well of a whole well to reinforce the rigidity against vibration and deflection of the undercover.

2 and 4, the automotive under cover 10 according to the present invention has a predetermined length, width and height, and has a rear step 121 so as to be adjacent to one side surface 124, 125 of the rear part. And a fourth vibration-enhancing rib 240 extending in the longitudinal direction X and the width direction Y. That is, as shown in FIG. 4, the fourth vibration-enhancing rib 240 is formed to extend in the longitudinal direction and the width direction in the rear step portion 121 so as to be adjacent to the right side surface 125 of the rear portion. 4, the under cover is coupled to the left side of the vehicle. In this case, the fourth vibration-enhancing rib 240 is formed at a position adjacent to the left side of the rear portion. As described later with reference to FIG. 8 and Table 1, the fourth vibration-enhancing rib 240 performs a function of reinforcing the rigidity of vibration frequency and deflection amount of the vibration frequency for the 15 Hz band.

 As shown in Figs. 2 and 5, the automotive under cover 10 according to the present invention has a certain length, width, and height, and is adjacent to one side surface 124, 125 of the rear portion at the rear end 123 of the rear end portion And a fifth vibration-strengthening rib 250 extending in the longitudinal direction X and the width direction Y. 5, the fifth vibration-reinforcing rib 250 is extended from the rear end 123 of the rear portion in the longitudinal direction and the width direction Y and the height direction Z adjacent to the right side surface 124 of the rear portion, . 5, the under cover is coupled to the left side of the vehicle. In this case, the fifth vibration-enhancing rib 250 is formed at the other portion of the same and adjacent to the left side of the rear portion. As described later with reference to FIG. 8 and Table 1, the fifth vibration reinforcing rib 250 performs a function of reinforcing the vibration frequency of the 34 Hz band and the rigidity against the deflection amount.

As described above, the under cover for a vehicle and the method of manufacturing the same according to the present invention are used for vibration and sagging due to the vibration reinforcing part formed on the front part and the rear part of the body part, So that the durability and the strength of the under cover can be remarkably improved.

2 and 6 to 7, the anti-sag preventing part 300 of the under cover 10 for a vehicle according to the present invention has a certain length, width and height, and the second vibration-reinforcing rib rear end 222 The second vibration reinforcing rib 220 and the third vibration reinforcing rib 230 are extended and extended in the longitudinal direction on the upper end surface 223 of the third vibration reinforcing rib and the upper end surface 232 of the front end 231 of the third vibration reinforcing rib. And the first sag prevention rib 310 is formed. 2 and 6 to 7, the first sag prevention ribs 310 are formed such that the front end of the first sag prevention ribs starts from the upper end surface adjacent to the rear end of the second vibration-resisting ribs and the first sag prevention ribs The rear end of the rib is formed in two stages on the upper surfaces of the second vibration-enhancing rib and the third vibration-enhancing rib across the second vibration-enhancing rib and the third vibration-enhancing rib to the upper end adjacent to the tip of the third vibration- .

7, the width W3 of the first slack prevention ribs is formed to be smaller than the widths W1 and W2 of the second vibration reinforcing ribs and the third vibration reinforcing ribs Since the width W3 of the first sag prevention ribs is smaller than the widths W1 and W2 of the second and third vibration reinforcing ribs as described above, 233 of the second and third vibration-resisting ribs are laminated in two stages so as to increase the rigidity against sagging while minimizing the increase in weight while minimizing the tolerance limit with respect to the height of the undercover, It is possible to achieve miniaturization. 9 and Table 1, the first deflection reinforcing ribs 310 are disposed on the upper surfaces 223 and 233 of the second vibration-enhancing rib 220 and the third vibration-enhancing rib 230 in two stages The rigidity of the under cover against the deflection of the under cover is additionally reinforced, and the rigidity against deflection is reinforced while the weight of the under cover is reduced. Thus, the durability and the strength of the under cover can be remarkably improved.

2, the deflection preventing portion 300 of the under cover 10 for a vehicle according to the present invention further includes a second deflection reinforcing rib 320 and a third deflection reinforcing rib 330. As shown in FIG.

The second sagging preventing rib 320 has a predetermined length and a width and a height and has a rear end 113 and a rear end 113 of the front part adjacent to one side surfaces 114 and 115 of the front part and a side surface 124 and 125 of the rear part, Is extended in the longitudinal direction so as to be parallel to the first sag preventing ribs (310) across the front end (122). 2, the second sag prevention ribs 320 are formed so as to be in contact with the left side surface 114 of the front part and the left side surface 124 of the rear part so that the front end part 113 and the rear part front end 122 Is formed in a straight shape so as to be parallel to the first sag prevention ribs (310). As described above, in FIG. 2, the under cover is coupled to the left side of the automobile. At this time, the second deflection preventing rib 342 is formed so that the other parts are identical and adjacent to the right side of the front portion and the right side of the rear portion. The second sagging preventing rib 320 has a minimum length and a height at a portion where the rear end 113 of the front part and the front end 122 of the rear part contact each other across the rear end 113 of the front part and the front end 122 of the rear part, The rigidity of the undercover can be remarkably improved by further reinforcing the rigidity against deflection while the weight of the undercover can be increased while the weight of the undercover is reinforced by strengthening the stiffness to the deflection secondarily while minimizing the weight increase, And reliability can be increased, and consumers' satisfaction can be improved and export activation can be promoted.

The third sag prevention ribs 330 have a predetermined length, width and height and extend in the longitudinal direction and the width direction on the front step portion 111 so as to be adjacent to one side surface 114, 115 of the front portion. That is, as shown in FIG. 2, the third sag prevention ribs 330 extend in the longitudinal direction and the width direction in the front step portion 111 so as to be adjacent to the right side surface 115 of the front portion. 2, the under cover is coupled to the left side of the vehicle. At this time, the third vibration-enhancing rib 330 is formed at the other portion of the same and adjacent to the left side of the front portion. Since the third deflection preventing ribs 330 are further formed at the optimum positions in the lengthwise and widthwise directions of the front step portion 111 so as to be adjacent to the right side surface 115 of the front portion in the minimum length, width, and height The weight of the undercover is strengthened to the second degree while the weight increase is minimized, and the rigidity against deflection is additionally reinforced, thereby reducing the manufacturing cost and manufacturing time of the undercover, The convenience of the operator can be improved.

The first and second deflection preventing ribs 310 and 330 may be formed in a straight shape and the third deflection preventing ribs 330 may be formed in a full-length well shape to prevent deflection of the undercover. Strengthen the rigidity.

Item Vibration deformation amount
(mm) Deflection
(mm) weight
(g) Conventional
Undercover 15Hz 20Hz 34Hz 44Hz 52Hz 390.2
1354
42.58 3.74 31.79 2.41 3.54
According to the present invention
Undercover 15Hz
(Fourth vibration-enhancing rib) 20Hz
(First vibration-enhancing rib) 34Hz
(Fifth vibration-reinforcing rib) 44Hz
(Second vibration-enhancing rib) 52Hz
(Third vibration-enhancing rib) 232.9
(First, second and third deflection preventing ribs)

1389
3.36 2.99 2.68 0.46 1.62 Difference
(% Decrease / increase rate) 39.22
(92.11%
decrease) 0.75
(13.9%
decrease) 29.11
(91.6%
decrease) 1.95
(81%
decrease) 2.86
(80.8%
decrease) 157.3
(40.3%
decrease) 35
(2.58%
increase)

Table 1 summarizes the data of the experimental results according to Figs. 8 and 9. Specifically, Table 1 is a table showing the relationship among the first, second, third, fourth and fifth vibration-enhancing ribs 210, 220, 230, 240 and 250 and the first, second and third anti-sagging ribs 310, 320 and 330 Data on the amount of deflection and weight due to gravity due to the vibration frequency of the under cover according to the present invention and the data on the first, second, third, fourth and fifth vibration-resistant ribs and the first, second and third anti- A comparison table of data on the deformation amount depending on the vibration frequency with respect to the under cover, the amount of deflection due to gravity, and the weight.

Fig. 8 shows the vibration frequency (Hz, X axis) and the amount of deformation (mm, Y axis) of the under cover according to the present invention in which a conventional under cover using a heavy- As shown in FIG. As shown in FIG. 8, the deformation amount (mm) of the conventional under cover is large at 15 Hz, 20 Hz, 34 Hz, 44 Hz, and 52 Hz. However, , 3, 4 and 5 vibration reducing ribs 210, 220, 230, 240 and 250 are formed, the deformation amount is reduced by 70% or more to remarkably improve the durability and strength of the under cover, And it is possible to reduce the maintenance cost of the automobile by preventing the damage of the secondary car parts due to the damage of the under cover.

9 is a graph showing the time (t, X axis) and the deflection amount (mm, Y) of the under cover according to the present invention in which a conventional under cover using a heavy-weight under- Axis). As shown in FIG. 9, the conventional under cover exhibits a deflection amount of up to 390.2 mm, but the under cover according to the present invention has the first, second and third deflection preventing ribs 310, 320, 330 The weight is increased by 35 grams (about 2%), but the deflection amount is reduced by about 40% or more, so that manufacturing cost and manufacturing time are reduced, rigidity is increased, and automobile fuel economy can be improved.

10, the method for manufacturing an under cover for an automobile according to the present invention comprises the steps of forming an under cover substrate S1, laminating a nonwoven fabric S2, pre-heating S3, (S4), and a trimming step (S5).

In the step (S1) of forming the under cover base material, the under cover base material is formed in a sheet form of the LWRT material in which the glass fiber is impregnated in the resin. According to a preferred embodiment of the present invention, the resin for forming the under cover base material in the step S1 of forming the under cover base material may include at least one selected from the group consisting of polypropylene (PP), polyethylene (PE), polyamide (PEI), polycarbonate (PC), polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyphenylene oxide (PPO), polyphenylene ether (PPE), and polyetherimide Or a combination of two or more.

As described above, since the LWRT material in which the above-described resin and glass fiber are impregnated is formed in the form of a sheet and the under cover base material is formed in a sheet form, it is easier to adhere the nonwoven fabric to be described later, The durability of the cover can be increased. Further, the fuel consumption of the automobile can be further improved by reducing the weight of the undercover.

After step (S1) of forming the under cover base material, nonwoven fabrics formed on both the top and bottom of the under cover base material or both the top and bottom of the base material of the under cover are laminated. The nonwoven fabric may be laminated only on the upper part of the undercover substrate and only on the lower part of the undercover substrate. Further, it can be laminated on both the upper and lower portions of the under cover substrate, if necessary. By this nonwoven fabric, the adhesive force to the undercover base material is increased, the strength of the under cover is increased, the weight of the final under cover is reduced, and the sound absorbing performance of the under cover can be improved. The nonwoven fabric is formed of 80 g / m 2 PE (polyethylene) / PET (polyester) LM fiber (Low Melting fiber), though not necessarily limited thereto. More preferably, in the step S4 of forming the nonwoven fabric, the nonwoven fabric is formed of 80 g / m 2 of PE (polyethylene) powder.

After the step S2 of laminating the nonwoven fabric, the nonwoven fabric laminated with the undercover substrate is preheated. In the preheating step S3, the undercoat base material and the nonwoven fabric laminated on the undercover base material are indirectly heated by using radiant heat. That is, the nonwoven fabric laminated on the under cover base material and the under cover base material is moved to the inside of the oven in the mobile unit, and indirectly heated through radiant heat in the oven. As the nonwoven fabric laminated on the under cover substrate and the under cover substrate is preheated, the adhesion between the nonwoven fabric and the under cover substrate is improved, and the surface quality of the under cover is further improved as the peel strength of the nonwoven fabric is increased. Can be improved.

After the preheating step S3, the undercoat substrate and the nonwoven fabric laminated on the undercover substrate are molded into an under cover in the press.

After the undercover molding step S4, the molded undercover is trimmed to conform to the final under cover. That is, in the step S4 of molding the under cover, It is possible to further improve the quality of the undercover by satisfying the error value of the undercover and the like, thereby reducing the generation rate of defective products, thereby reducing the manufacturing time and manufacturing cost.

As described above, according to the method for manufacturing an under cover for a vehicle according to the present invention, the rigidity of the under cover relative to the vibration and deflection is improved by the vibration reinforcement formed at the front portion and the rear portion of the body portion while using the under- And further reinforces the rigidity of the undercover to be deflected by the deflection reinforcing portion formed across the front portion and the rear portion of the body portion or formed in the front portion of the body portion to reduce the weight of the undercover, As the rigidity is reinforced, the durability and strength of the under cover can be remarkably improved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

10: under cover, 11: mounting part,
100: body part, 110: front part,
120: rear portion, 200: vibration reinforcing portion,
210, 220, 230, 240, 250: first, second, third, fourth and fifth vibration-
300: anti-sagging portion,
310, 320, 330: 1st, 2nd, 3rd sag prevention ribs.

Claims (12)

1. An under cover for an automobile, which is provided at a lower portion of the automobile and protects a component installed in the automobile,
The under cover
A body portion having a front portion having a predetermined length and a width to cover a lower portion of the automobile and forming a front portion and a rear portion forming a rear portion;
A vibration reinforcing portion formed on the front portion and the rear portion of the body portion to reinforce the rigidity of the under cover against vibration; And
And a deflection reinforcing portion formed on the front portion of the body portion or formed across the front portion and the rear portion of the body portion to reinforce the rigidity of the under cover against deflection.
The method according to claim 1,
The front portion of the body portion
And a front stepped portion formed stepwise on one side surface of the rear end of the front portion,
The rear portion of the body portion
And a rear stepped portion formed to be stepped on one side of a rear end of the rear portion so as to be positioned on the same horizontal line as the front step portion.
3. The method of claim 2,
Wherein the vibration-
A first vibration-resisting rib having a predetermined length, a width and a height, and extending in a longitudinal direction and a width direction at a portion adjacent to the front end of the front portion;
A second vibration-resisting rib having a predetermined length, a width and a height, and extending from the rear end of the first vibration-resisting rib to a rear end of the front portion in a longitudinal direction and a width direction; And
And a third vibration-absorbing rib having a predetermined length, a width and a height, and extending in a longitudinal direction and a width direction adjacent to a rear end of the rear portion at a front end of the rear portion.
The method of claim 3,
Wherein the vibration-
And a fourth vibration-enhancing rib having a predetermined length, a width and a height, and extending in the longitudinal direction and the width direction at the rear stepped portion. The method of claim 3,
Wherein the vibration-
And a fifth vibration-absorbing rib having a predetermined length, a width and a height, and extending from the rear end of the rear portion in the longitudinal direction and the width direction adjacent to one side of the rear portion. .
The method according to claim 4 or 5,
The sag preventing unit
Wherein the first vibration-resisting rib and the second vibration-resisting rib have a predetermined length, a width and a height, and the first vibration-resisting rib and the second vibration- And a first slack prevention rib extending in a direction of the first slack preventing rib.
The method according to claim 6,
The sag preventing unit
And has a predetermined length, a width and a height, and extends in the longitudinal direction so as to be parallel to the first sag prevention ribs across the front ends of the front part and the rear part adjacent to one side surface of the front part and one side surface of the rear part And a second sag preventing rib formed on the inner surface of the under cover.
8. The method of claim 7,
The sag preventing unit
And a third slack prevention rib having a predetermined length, a width and a height, and extending in the longitudinal direction and the width direction at the front step portion.
9. The method of claim 8,
Wherein the width of the first slack prevention rib is smaller than the width of the second vibration strengthening rib and the width of the third vibration reinforcing rib.
The method of manufacturing an under cover for a vehicle according to any one of claims 1 to 9,
The method for manufacturing an under cover for an automobile,
(S1) forming an under cover base material in the form of a sheet, the LWRT material having the glass fiber impregnated with the resin;
(S2) of laminating the nonwoven fabric on the top or bottom of the undercover substrate or on the top and bottom of the substrate of the undercover;
Preheating (S3) the nonwoven fabric laminated on the undercover substrate and the undercover substrate; And
(S4) molding the nonwoven fabric laminated on the preheated undercover base material and the under cover base material into an under cover in a press.
11. The method of claim 10,
After the step S4 of molding the undercover,
Further comprising the step of: (S5) trimming the molded undercover to conform to the final undercover.
12. The method of claim 11,
In the step (S1) of forming the under cover substrate,
The resin is selected from the group consisting of polypropylene (PP), polyethylene (PE), polyarimide (PA), polycarbonate (PC), polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyphenylene oxide , Polyphenylene ether (PPE), and polyetherimide (PEI), or a combination of two or more thereof.

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