JP2018002021A - Noise reduction member for fender - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a noise reduction member for a fender which further improves quietness of a passenger compartment while reducing increase of the vehicle weight.SOLUTION: A noise reduction member 10 for a fender is disposed in a fender interior space R formed between a fender panel 3 serving as an outer panel of a vehicle and an inner fender 6 forming a wheel house 5. The noise reduction member 10 for the fender disposed in the fender interior space R is formed by a foam material and has wall parts 10a, 10b which are disposed in the fender interior space R, extend in a vertical direction, and are arranged spaced away from each other.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a noise reduction member disposed in a fender of an automobile, and particularly belongs to the technical field of a structure for reducing noise entering a vehicle interior.

  Generally, a fender of an automobile has a fender panel that serves as an outer plate of the vehicle and an inner fender that forms a wheel house, and a fender inner space is formed between the fender panel and the inner fender. In addition, there are multiple fenders in the car, the fender formed on the front tire side is called the front fender, the fender formed on the rear tire side is called the rear fender, and both are collectively referred to as not distinguishing front and rear Is simply called a fender.

  Since the space inside the front fender communicates with the front grille, noise outside the vehicle compartment may enter the space inside the front fender via the front grille. Moreover, since the space in the front fender is adjacent to the engine room, noise in the engine room tends to enter the space in the front fender. Furthermore, since the space in the front fender is adjacent to the wheel house, road noise generated when the vehicle is traveling is likely to enter the space in the front fender. Moreover, since the rear fender inner space is adjacent to the exhaust system, exhaust noise easily enters the fender inner space.

  And since the rear side of the space in the front fender is only separated from the vehicle compartment by a panel or the like, noise that has entered the space in the front fender tends to enter the vehicle compartment. Furthermore, because the front fender space is close to the entrance that is opened and closed by the front door provided on the side of the vehicle body, the noise in the front fender space passes through the door seal and gets in and out. It is easy to enter the passenger compartment through the mouth, and the quietness of the passenger compartment may be deteriorated. Similarly, noise that has entered the interior space of the rear fender tends to enter the front passenger compartment. As a structure for improving the quietness in the passenger compartment, for example, structures disclosed in Patent Documents 1 to 4 are known.

  In Patent Document 1, a soundproof material formed in a plate shape along the upper surface of the inner fender is attached to the upper surface of the inner fender, thereby reducing engine sound and road noise.

  In Patent Document 2, a cushion material formed in a flat plate shape that is long in the vertical direction is arranged on the rear side of the space in the front fender.

  In Patent Document 3, a sound insulating material formed in a flat plate shape that is long in the vertical direction is attached to a gap formed between a front fender panel and a pillar panel via an attachment member.

  In Patent Document 4, a seal member having two sponge portions is disposed in a space defined by a front fender panel, a fender apron lower member, and a fender apron upper member at a position away from the inner fender. ing.

JP 2014-28515 A Registered Utility Model No. 3048125 JP 2004-26060 A JP 2010-115985 A

  By the way, in recent years, there is an increasing demand for quietness in the passenger compartment, and further quietness is required, but there is also a demand for weight reduction of the vehicle, and sound absorption as disclosed in Patent Documents 1 to 4 is required. I want to minimize the increase in weight when a member or sound insulation member is provided.

  However, in Patent Document 1, since the soundproofing material is only attached to the upper surface of the inner fender, the noise that has entered the front fender space from the front reaches the rear side of the front fender space as it is and reaches the rear of the front fender space. There is a concern of entering.

  Then, although it is possible to arrange | position a cushioning material in the rear side of the front fender space like patent document 2, since the cushioning material is a simple flat plate shape, even if the sound insulation effect is obtained, the sound absorption effect is It is considered not so high. The same applies to the sound insulating material of Patent Document 3.

  Furthermore, Patent Document 4 is a configuration including a substrate and a sponge plate that sandwiches the substrate from both sides. The manufacturing process is complicated, and at the same time the final form of the product is as simple as Patent Documents 2 and 3. It is considered that the sound absorption effect is not so high because of the flat plate shape.

  The present invention has been made in view of this point, and an object of the present invention is to further enhance the quietness of the passenger compartment while reducing the increase in vehicle weight.

  In order to achieve the above object, in the present invention, a multi-wall structure member made of foam material and provided with a gap is disposed on the rear side of the fender inner space, thereby reducing noise in the fender inner space while being lightweight. In addition to being able to absorb sound sufficiently, the sound insulation was improved.

The first invention is
In the fender noise reducing member disposed in the fender inner space formed between the fender panel that is the outer plate of the automobile and the inner fender that forms the wheel house,
The noise reduction member for fenders is made of a foam material, and has a first wall portion and a second wall portion that are disposed in the fender inner space, extend in the vertical direction, and are spaced apart from each other. It is characterized by.

  According to this configuration, since the noise reducing member for fenders extends in the vertical direction in the fender inner space, the noise in the fender inner space is less likely to leak from the fender inner space to the passenger compartment side and the entrance of the vehicle body. At this time, since the first wall portion and the second wall portion are spaced apart from each other to form a multiple wall structure, the sound insulation effect of the fender space is enhanced while being lightweight. Furthermore, since the first wall portion and the second wall portion are made of a foam material, the structure is lighter, and the noise in the fender inner space is absorbed by both the first wall portion and the second wall portion. In addition, a large sound absorption area is secured, and sound absorption performance is enhanced.

According to a second invention, in the first invention,
The foam material has a solid skin layer on the surface.

  That is, the solid skin layer serves as a sound insulation wall. Furthermore, rainwater, water at the time of car washing, or the like may enter the fender space from the outside, and this water may adhere to the first wall portion or the second wall portion. By having a solid skin layer on the surface of the foamed material, water hardly permeates even if it adheres to the first wall portion or the second wall portion, and a decrease in sound insulation performance and sound absorption performance is suppressed.

According to a third invention, in the first or second invention,
The fender noise reducing member has a cylindrical shape extending in the vertical direction.

  According to this configuration, the shape of the fender noise reduction member is simplified and the manufacture becomes easy. Furthermore, since the parts located so as to sandwich the center line among the peripheral wall parts are arranged apart from each other by being cylindrical, these parts are the first wall part and the second wall part. Thus, the first wall portion and the second wall portion can be easily obtained.

According to a fourth invention, in the third invention,
At least one of the upper end portion and the lower end portion of the fender noise reduction member is open.

  According to this configuration, the noise in the fender inner space can be actively absorbed by the first wall portion and the second wall portion from the open portion of the fender noise reduction member into the fender noise reduction member. It becomes possible.

According to a fifth invention, in the first or second invention,
The noise reduction member for a fender is formed by folding the foam material.

  According to this configuration, since the plurality of first wall portions and second wall portions are formed, the sound insulation performance and sound absorption performance are enhanced. Further, by folding the foam material, it becomes easy to manufacture the fender noise reduction member.

A sixth invention is the invention according to any one of the first to fifth aspects,
An inner fender noise reduction member made of a foam material having a plurality of wall portions attached to a surface of the inner fender facing the inner space of the fender and spaced apart from each other is further provided.

  According to this configuration, the noise reduction member for the inner fender is provided in the inner fender, so that the noise in the inner space of the fender is blocked and absorbed by the plurality of wall portions of the noise reduction member for the inner fender.

  According to the first invention, since the first wall portion and the second wall portion that are spaced apart from each other are provided in the inner space of the fender, the sound insulation effect of the noise in the inner space of the fender is enhanced while being lightweight. In addition, since the first wall portion and the second wall portion are made of a foam material, the sound absorption performance can be enhanced by ensuring a wide sound absorption area while making the structure lighter. Therefore, the quietness of the passenger compartment can be further enhanced while reducing the increase in vehicle weight.

  According to the second aspect of the invention, since the foam material has a solid skin layer, the solid skin layer serves as a sound insulation wall and water adheres to the first wall portion and the second wall portion. It does not soak in, can suppress a decrease in sound insulation performance and sound absorption performance, and can enhance the quietness of the passenger compartment over a long period of time.

  According to the third aspect of the invention, since the fender noise reducing member has a cylindrical shape, it can be easily manufactured and the first wall portion and the second wall portion can be easily obtained.

  According to the fourth invention, since at least one of the upper end portion and the lower end portion of the fender noise reduction member is opened, the noise in the fender internal space is put into the fender noise reduction member, and the first wall portion and the second wall portion Sound can be absorbed by the wall. Thereby, sound absorption performance can be improved further.

  According to 5th invention, while being able to manufacture easily by folding a foaming material, sound insulation performance and sound absorption performance can be improved with a some 1st wall part and 2nd wall part.

  According to the sixth aspect of the invention, since the noise reduction member for the inner fender is further provided, the quietness of the passenger compartment can be further enhanced.

It is a left view of the front part of the motor vehicle provided with the noise reduction member for front fenders concerning Embodiment 1. It is a perspective view of the noise reduction member for front fenders. It is a side view of the inner fender to which the noise reduction member for inner fenders was attached. It is a perspective view of the inner fender to which the noise reduction member for inner fenders was attached. It is a perspective view of the noise reduction member for inner fenders. FIG. 6 is a diagram corresponding to FIG. 3 according to a first modification of the first embodiment. FIG. 6 is a view corresponding to FIG. 3 according to a second modification of the first embodiment. FIG. 6 is a view corresponding to FIG. 3 according to a third modification of the first embodiment. FIG. 3 is a view corresponding to FIG. 1 according to a second embodiment. FIG. 3 is a diagram corresponding to FIG. 3 according to a second embodiment. FIG. 6 is a view corresponding to FIG. 4 according to the second embodiment. FIG. 6 is a view corresponding to FIG. 1 according to the third embodiment. FIG. 6 is a view corresponding to FIG. 1 according to a fourth embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

(Embodiment 1)
FIG. 1 is a left side view of a front portion of an automobile 1 including a front fender noise reduction member 10 according to Embodiment 1 of the present invention. In the description of this embodiment, the front side of the vehicle is simply referred to as “front”, the rear side of the vehicle is simply referred to as “rear”, the left side of the vehicle is simply referred to as “left”, and the right side of the vehicle is simply referred to as “right”.

(Configuration of the front of the car)
The automobile 1 is a so-called passenger automobile, and although not shown, an engine room on which an engine or the like is mounted is provided at the front, and a passenger compartment is provided on the rear side of the engine room. Is separated from the passenger compartment by a dash panel. A front bumper 2 is provided at the front end of the automobile 1. The front bumper 2 has an opening for taking cooling air into the engine room. In addition, an entrance (not shown) is formed on the side of the automobile 1, and the entrance is opened and closed by a front door D. Further, a sealing material (not shown) made of a conventionally known elastic material is provided between the entrance and exit of the vehicle body and the peripheral edge of the front door D.

  On the rear side of the front bumper 2, fender panels 3 that are outer plates on the front side of the automobile 1 are disposed on both the left and right sides. The lower edge 3a of the fender panel 3 is formed to be curved upward corresponding to the shape of the front wheel house 5 formed so as to accommodate the front wheels. An inner fender 6 that forms a wheel house 5 is provided at the front of the automobile 1. The inner fender 6 is a plate-shaped component made of a resin material, and as shown in FIG. 8, the curved plate portion 6a curved upward and the front plate portion 6b extending forward from the front end portion of the curved plate portion 6a. And a rear side plate portion 6b extending rearward from the rear end portion of the curved plate portion 6a. The curved plate portion 6a, the front side plate portion 6b, and the rear side plate portion 6b are integrally formed. The curved plate portion 6 a is formed along the lower edge portion 3 a of the fender panel 3. Predetermined portions of the curved plate portion 6a, the front plate portion 6b, and the rear plate portion 6b are fixed to the fender panel 3, the vehicle body side component, and the like.

  The fender panel 3 and the inner fender 6 constitute a front fender 7. Since the fender panel 3 is an outer plate of the automobile 1, it is formed so as to swell to the left side. A fender inner space R is formed between the fender panel 3 and the inner fender 6. A fender apron (not shown) is provided on the vehicle inner side (engine room side) of the fender inner space R, and the engine room and the fender inner space R are partitioned by the fender apron. That is, the fender inner space R is defined by the fender panel 3, the inner fender 6, and the fender apron.

  The fender inner space R is formed from the front end to the rear end of the fender panel 3. The front part of the fender inner space R communicates with the opening of the front bumper 2 and the like. Further, the rear part of the fender inner space R is close to the front part of the entrance / exit of the automobile 1 and the front part of the front door D, and at least a part thereof is opened rearward.

  Further, since the curved portion 6a of the inner fender 6 is curved upward, the vertical dimension of the fender inner space R becomes longer as it goes to the front side of the fender inner space R and longer as it goes to the rear side. It has become. And the dimension of the up-down direction of the space R in the fender becomes the shortest in the part located in the uppermost part of the curved part 6a.

  Since the front part of the inner space R of the fender communicates with the opening of the front bumper 2, noise outside the passenger compartment may enter the inner space R of the fender through the opening. Further, since the fender inner space R is adjacent to the engine room, noise in the engine room tends to enter the fender inner space R. Furthermore, since the inner space R of the fender is adjacent to the wheel house 5, road noise generated when the vehicle travels easily enters the inner space R of the fender. Since the right side of the vehicle is configured in the same manner as the left side, description thereof is omitted.

(Configuration of noise reduction member)
A front fender noise reduction member 10 is disposed in the fender inner space R of the automobile 1. In this embodiment, the front fender noise reduction member 10 also includes an inner fender noise reduction member 20, and the inner fender noise reduction member 20 is also disposed in the fender inner space R. The front fender noise reduction member 10 and the inner fender noise reduction member 20 are different in arrangement position and structure in the fender inner space R, but have a sound absorbing property to absorb the noise in the fender inner space R. It is common to the point which has the sound insulation which makes it difficult to permeate | transmit the noise of the space R of the fender to the entrance / exit side of the motor vehicle 1.

  The front fender noise reduction member 10 is made of a foam material and is disposed on the rear side of the fender inner space R. That is, as shown in FIG. 2, the front fender noise reduction member 10 has a cylindrical shape extending in the vertical direction, and the vertical dimension of the front fender noise reduction member 10 is the rear side of the fender inner space R. It is set to the same size as the vertical dimension. Further, the outer diameter of the front fender noise reduction member 10 is set so as to be able to block the rearward open portion of the rear portion of the fender inner space R from the inner side of the fender inner space R.

  The foam material constituting the noise reduction member 10 for the front fender may be a material having elasticity, and for example, various rubbers, thermoplastic elastomers, and the like can be foamed by a known method. In this embodiment, the foam material is EPDM (ethylene propylene diene rubber), but is not limited thereto. Examples of the rubber include chloroprene rubber (CR), styrene-butadiene rubber (SBR), Synthetic rubbers such as acrylonitrile butadiene rubber (NBR) can be mentioned. Examples of the thermoplastic elastomer include olefin (TPO) and styrene (TPS). Examples of the thermoplastic resin include polyethylene (PE), polypropylene (PP), and ethylene vinyl acetate copolymer (EVA). The raw material of the foam material may be only one kind of the above raw materials, or may be a raw material in which any plural kinds are mixed. In addition, the foam material is preferably a low specific gravity type from the viewpoint of weight reduction.

  The foam material has a three-layer structure. That is, although not shown in the drawing, the surface has a solid skin layer and the back surface has a similar skin layer, and a foam layer is provided between these skin layers. The front side skin layer and the back side skin layer are formed thin so as to ensure sound absorption by the foam layer. The front skin layer and the back skin layer can be set to the same thickness, or one can be made thinner than the other. Moreover, since the front side skin layer and the back side skin layer are solids having no bubbles, they have a water-stopping property that prevents liquid such as water from passing in the front and back direction. On the other hand, the form of bubbles in the foam layer may be, for example, an open-cell (continuous bubble) structure in which bubbles are continuous, or a part of bubbles are continuous and other bubbles are not continuous. An open cell (semi-open cell) structure may be used, or a closed cell structure in which the cells are not continuous may be used.

  As shown in FIG. 2, the front fender noise reduction member 10 can be obtained by bending a foam material formed into a sheet shape into a cylindrical shape and stopping both edges of the foam material. As a method for stopping both edges of the foamed material, various methods such as a clip, a stapler, an adhesive, a double-sided tape, and welding can be used. The foam material may be formed into a cylindrical shape, and in this case, an extrusion method or the like may be used. The thickness of the foam material can be set to, for example, 10 mm or more and 30 mm or less.

  The front fender noise reducing member 10 has an upper end and a lower end open. As a result, the noise in the fender inner space R easily enters the front fender noise reduction member 10. In addition, only the upper end part of the noise reduction member 10 for front fenders may be open | released, and only a lower end part may be open | released. Moreover, a through-hole can also be formed in a part of the peripheral wall portion of the front fender noise reduction member 10. This also facilitates the noise in the fender inner space R to enter the front fender noise reduction member 10. Alternatively, by forming a non-through hole in a part of the front fender noise reduction member 10 and removing the skin layer, the noise in the fender inner space R can easily enter the foam layer inside the front fender noise reduction member 10, thereby absorbing the sound. Performance can be improved.

  Since the front fender noise reducing member 10 is made of an elastic foam material, for example, when the front fender noise reducing member 10 is assembled in a state where the fender panel 3 is already assembled to the vehicle body, the fender space R However, the front fender noise reduction member 10 can be deformed and easily pushed into the rear side of the fender inner space R. Then, the front fender noise reduction member 10 is pushed into the rear side of the fender inner space R and then restored in shape, so that the front fender noise reduction member 10 is a vehicle in the fender inner space R as shown in FIG. It has a shape that is arranged on the rear side and extends in the vertical direction. Although not shown, the front fender noise reduction member 10 can be fixed to, for example, a mounting hole opened in the flange in the fender space R via a clip or the like.

  In a state where the front fender noise reduction member 10 is disposed on the vehicle rear side of the fender inner space R, the front fender noise reduction member 10 has a cylindrical shape, and therefore is positioned so as to sandwich the center line among its peripheral wall portions. The front side wall part 10a and the rear side wall part 10b that are to be arranged are spaced from each other in the front-rear direction. That is, the front side wall part 10a and the rear side wall part 10b of the noise reduction member 10 for front fenders extend in the vertical direction and are arranged on the first wall part and the second wall part that are spaced apart from each other in the front-rear direction. Equivalent to. The front fender noise reduction member 10 may be cylindrical or polygonal.

  The inner fender noise reduction member 20 is attached to the surface of the inner fender 6 that faces the inner space R of the fender, that is, the upper surface of the curved portion 6 a of the inner fender 6. As shown in FIGS. 3 to 5, the inner fender noise reduction member 20 includes a main body portion 21 made of the same foam material as the front fender noise reduction member 10 and a base portion 22 to which the main body portion 21 is fixed. ing. The base 22 has a thin plate or film shape made of polyethylene or the like, for example, and the base 22 is formed along the upper surface of the curved portion 6a of the inner fender 6 and is fixed to the upper surface. . As a fixing method of the base part 22, various methods, such as a clip, an adhesive agent, a double-sided tape, welding, can be used, for example.

  As shown in FIGS. 3 and 4, the main body 21 is formed by folding a foam material. That is, the main body 21 includes a plurality of hollow projections 21a, 21a, ... formed so as to be arranged along the curved portion 6a of the inner fender 6, and both ends in the direction in which the projections 21a are arranged (both ends in the front-rear direction). ) Have a first fixing part 21c and a second fixing part 21d formed respectively. The protruding portions 21a, 21a,... Are portions obtained by bending a plate-like foam material so that peaks and valleys are alternately formed, and can be easily formed.

  The projecting heights of the projecting portions 21a, 21a,... May be all the same or different from each other, but the tip of at least one projecting portion 21a is on the inner surface of the fender panel 3. It is preferable to set so as to abut. As a result, the noise outside the passenger compartment that has entered from the front part of the fender inner space R reliably hits the protruding portion 21a, and is difficult to reach the rear side of the fender inner space R. It should be noted that at least one protrusion 21a may be provided, but a plurality of protrusions 21a are preferably provided.

  Each protruding portion 21a has two wall portions 21e and 21f that are spaced apart from each other in the front-rear direction. The wall portion 21e and the wall portion 21f are formed so as to approach each other toward the front end side in the protruding direction, and the space between the wall portion 21e and the wall portion 21f becomes narrower toward the front end side in the protruding direction. Yes. Moreover, you may form a through-hole in at least one of the wall part 21e and the wall part 21f.

  The first fixing portion 21 c and the second fixing portion 21 d have a plate shape extending along the base portion 22, and are fixed to the base portion 22. Moreover, the part between adjacent protrusion parts 21a and 21a is made into the intermediate | middle fixing | fixed part 22b. The intermediate fixing portion 22 b is fixed to the base portion 22.

(Effect of Embodiment 1)
As described above, according to the first embodiment, the front side wall portion 10a and the rear side wall portion 10b of the front fender noise reduction member 10 disposed on the rear side of the fender inner space R are formed in the fender inner space R. Since it extends in the vertical direction, the noise in the fender inner space R is less likely to leak from the fender inner space R to the rear, that is, in the direction of the vehicle entrance / exit. At this time, since the front side wall part 10a and the rear side wall part 10b are spaced apart from each other in the front-rear direction to form a multiple wall structure, after the noise in the fender inner space R is blocked by the front side wall part 10a, The sound is also blocked by the rear side wall portion 10b, and the sound insulation effect is enhanced. In addition, the front side wall 10a and the rear side wall 10b are spaced apart from each other in the front-rear direction and are made of a foam material, so that the structure is lightweight. Sound is absorbed by both of the rear side wall portions 10b, and a sound absorption area is ensured widely, and sound absorption performance is enhanced. Therefore, the quietness of the passenger compartment can be further enhanced while reducing the increase in vehicle weight.

  In addition, rainwater, water during car washing, or the like may enter the fender inner space R from the outside, and this water may adhere to the noise reduction member 10 for the front fender. Since there is a solid skin layer on the surface of the foam material constituting the noise reduction member 10 for the front fender, the solid skin layer serves as a sound insulation wall and water adheres to the front side wall portion 10a and the rear side wall portion 10b. Even if it permeates, it can suppress the fall of sound insulation performance and sound absorption performance, and can improve the quietness of a cabin over a long period of time.

  Moreover, since the noise reduction member 10 for front fenders is made into a cylindrical shape, the shape is simplified and the manufacture becomes easy. Furthermore, since the parts located so as to sandwich the center line among the peripheral wall parts are arranged apart from each other by forming a cylindrical shape, the front side wall part 10a arranged with a space between each other. And the rear side wall part 10b can be obtained easily.

  Further, since both ends of the front fender noise reduction member 10 are open, the noise in the fender inner space R is put inside the front fender noise reduction member 10 and is actively received by the front side wall portion 10a and the rear side wall portion 10b. Sound absorption.

  Further, since the inner fender 6 is provided with the inner fender noise reduction member 20, the noise in the fender inner space R can be isolated and absorbed by the plurality of wall portions 21e and 21f of the inner fender noise reduction member 20. Can do.

(Test results)
Next, an automobile provided with the front fender noise reducing member 10 and the inner fender noise reducing member 20 of the first embodiment, and an automobile provided with a front fender and inner fender noise reducing member made of a urethane molding block, The test results comparing the quietness of each will be described. At this time, the total weight of the noise reduction member 10 for the front fender and the noise reduction member 20 for the inner fender of Embodiment 1 was 116 g, and the total weight of the noise reduction member made of the urethane molding block of the comparative example was 213 g.

  The car used for the test is a regular passenger car. As shown in FIG. 1, a speaker S is installed so as to be adjacent to the front wheel of a parked vehicle, and a sound of 250 Hz to 5000 Hz is output upward from the speaker S so as to have a sound pressure level of 100 dB. Reproduced road noise. The measurement position of the sound pressure level in the passenger compartment is the position of the ears of the front seat occupant, and the microphone M is installed at this position. As a result, in the case of an automobile provided with the noise reduction member 10 for the front fender and the noise reduction member 20 for the inner fender, the sound in the region of 500 Hz to 2000 Hz is compared with the automobile provided with the noise reduction member made of a urethane molding block. The pressure level particularly decreased, for example, about 1.5 dB in the vicinity of 600 Hz, and about 2.1 dB in the vicinity of 1250 Hz. Further, even in the vicinity of 3200 Hz, the automobile provided with the noise reduction member 10 for the front fender and the noise reduction member 20 for the inner fender has a lower sound pressure level, which is 1 as compared with an automobile not provided with both. It decreased by about 7 dB.

(Modification of Embodiment 1)
As in Modification 1 of Embodiment 1 shown in FIG. 6, the sound absorbing material 23 may be inserted into the protrusion 21 a of the inner fender noise reduction member 20. The sound absorbing material 23 may be a foam material similar to the noise reduction member 10 for the front fender, or may be a sound absorbing material made of fiber. By inserting the sound absorbing material 23 inside the protruding portion 21a, the sound absorbing performance can be further enhanced and the collapse of the protruding portion 21a can be suppressed.

  Further, as in Modification 2 of Embodiment 1 shown in FIG. 7, a plurality of noise reduction members 20, 20, 20 for inner fenders are provided at intervals in the extending direction of the curved portion 6 a of the inner fender 6. Also good. In this case, the inner fender noise reduction member 20 can be efficiently disposed only in the portion of the curved portion 6a of the inner fender 6 where the sound absorption effect and the sound insulation effect are high.

  Moreover, you may narrow the space | interval of the protrusion part 21a of the noise reduction member 20 for inner fenders like the modification 3 of Embodiment 1 shown in FIG. In this case, the wall portions that respectively form the adjacent protruding portions 21a and 21a are arranged at intervals. In Modification 3, a plurality of inner fender noise reduction members 20 may be provided as in Modification 2.

(Embodiment 2)
9 to 11 relate to a second embodiment of the present invention. The second embodiment is different from the first embodiment in the structure of the noise reduction member for the inner fender, and other parts are the same as those of the first embodiment. Therefore, the same parts as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and different parts are described in detail.

  That is, the noise reduction member 30 for the inner fender of the second embodiment has a cylindrical shape that is fixed to the upper surface of the curved portion 6a of the inner fender 6 and protrudes upward, and the upper end portion is closed by the closing portion 30a. Since the inner fender noise reduction member 30 has a cylindrical shape, the front side wall portion 30b and the rear side wall portion 30c located so as to sandwich the center line among the peripheral wall portions are arranged with a space in the front-rear direction. become. A sound absorbing material made of a fiber (not shown) may be accommodated in the inner fender noise reduction member 30. The upper end portion of the inner fender noise reduction member 30 is preferably set so as to contact the inner surface of the fender panel 3.

  In the case of the second embodiment, the same effects as those of the first embodiment can be obtained. Moreover, since the shape of the noise reduction member 30 for inner fenders can be simplified, the manufacturing cost can be reduced.

In the second embodiment, the same inner fender noise reduction member 20 as in the first embodiment may be provided. Moreover, you may open | release the upper end part of the noise reduction member 30 for inner fenders. Moreover, you may form a through-hole in the surrounding wall part of the noise reduction member 30 for inner fenders.
(Test results)
Next, an automobile in which the noise reduction member 10 for the front fender and the noise reduction member 20 for the inner fender according to the second embodiment are arranged, and an automobile in which the noise reduction member for the front fender and the inner fender made of a urethane molding block are arranged. The test results comparing the quietness of each will be described. Since the test method has been described above, it will be omitted.

  As a result, in the case of an automobile provided with the front fender noise reduction member 10 and the inner fender noise reduction member 20, a sound pressure level equivalent to that of the first embodiment was obtained in almost all frequency ranges. At this time, the total weight of the noise reduction member of the second embodiment is 77 g, and the total weight of the urethane block molded product of the comparative example is 213 g. In the case of the second embodiment, the weight can be significantly reduced.

(Embodiment 3)
FIG. 12 relates to Embodiment 3 of the present invention. This Embodiment 3 is different from Embodiment 1 in that it does not have an inner fender noise reduction member, and the other parts are the same as Embodiment 1. Therefore, the same parts as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted. In the case of the third embodiment, the same effect as that of the first embodiment can be achieved by the provision of the front fender noise reduction member 10.

(Embodiment 4)
FIG. 13 relates to Embodiment 4 of the present invention. This Embodiment 4 is implemented in that the inner fender noise reduction member is not provided and the front fender noise reduction member has a fold-fold structure. Since it is different from the first embodiment and the other parts are the same as those of the first embodiment, the same parts as those of the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

  That is, the front fender noise reduction member 40 is configured in the same manner as the main body 21 of the inner fender noise reduction member 20 of the first embodiment, and is formed by folding a foam material. The front fender noise reduction member 40 extends in the vertical direction as a whole in the inner space R of the fender. The front fender noise reduction members 40 are respectively formed on a plurality of hollow protrusions 40a, 40a,... Formed in a line in the vertical direction, and in both ends (vertical direction both ends) in the direction in which the protrusions 40a are arranged. The upper fixing part 40c and the lower fixing part 40d are formed. Each protrusion 40a has two wall portions 40e and 40f that are spaced apart from each other in the vertical direction. The wall portion 40e is the first wall portion, and the wall portion 40f is the second wall portion. is there.

  Also in the case of the fourth embodiment, the noise reduction member 40 for the front fender disposed on the rear side of the fender inner space R extends in the vertical direction of the fender inner space R. It becomes difficult to leak from the inner space R to the rear, that is, the entrance / exit of the vehicle body. At this time, since the wall portion 40e and the wall portion 40f are spaced apart from each other in the vertical direction to form a multiple wall structure, the noise in the fender inner space R is blocked by the wall portion 40e and the wall portion 40f. This increases the sound insulation effect. Further, since the wall 40e and the wall 40f are made of foam material, the structure is lightweight, and the noise in the fender inner space R is absorbed by both the wall 40e and the wall 40f, and the sound absorption area is wide. The sound absorption performance is improved. Therefore, the quietness of the passenger compartment can be further enhanced while reducing the increase in vehicle weight.

  In the fourth embodiment, the inner fender noise reducing member 20 similar to that in the first embodiment may be provided, or the inner fender noise reducing member 30 similar to that in the second embodiment may be provided.

  In the first to fourth embodiments, the case where the present invention is applied to the front fender has been described. However, the present invention is not limited to this, but the present invention can also be applied to the rear fender. When applied to the rear fender, it becomes a noise reducing member for the rear fender, and various noises can be reduced from entering the passenger compartment from the rear side, and the effect can be obtained in the same manner as when applied to the front fender. The shape of the rear fender noise reduction member may be set to match the structure and shape of the rear fender.

  The above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  As described above, the present invention can be disposed, for example, in a fender inner space formed between a fender panel serving as a front outer plate of an automobile and an inner fender forming a front wheel house.

3 Fender panel 5 Wheel house 6 Inner fender 10 Noise reduction member 10a for front fender Front side wall (first wall)
10b Rear side wall (second wall)
20, 30 Noise reduction member 40 for inner fenders Noise reduction member 40e for front fenders Wall (first wall)
40f Wall (second wall)
R Fender interior space

Claims (6)

In the fender noise reducing member disposed in the fender inner space formed between the fender panel that is the outer plate of the automobile and the inner fender that forms the wheel house,
The noise reduction member for fenders is made of a foam material, and has a first wall portion and a second wall portion that are disposed in the fender inner space, extend in the vertical direction, and are spaced apart from each other. A noise reduction member for a fender characterized by In the noise reduction member for fenders according to claim 1,
The fender noise reducing member, wherein the foam material has a solid skin layer on the surface. In the fender noise reducing member according to claim 1 or 2,
The fender noise reducing member has a cylindrical shape extending in the vertical direction. In the noise reduction member for fenders according to claim 3,
At least one of the upper end portion and the lower end portion of the fender noise reduction member is open. In the fender noise reducing member according to claim 1 or 2,
The fender noise reduction member is formed by folding the foam material. In the fender noise reducing member according to any one of claims 1 to 5,
A fender characterized by further comprising an inner fender noise reducing member made of a foam material having a plurality of wall portions attached to a surface of the inner fender facing the fender inner space and spaced apart from each other. Noise reduction member for industrial use.

Images