JP7437238B2 - fender liner - Google Patents

Description

The present disclosure relates to a fender liner that can reduce engine noise leaking to the outside of a vehicle.

As this type of fender liner, one that covers the upper part of the wheel with a sound absorbing structure is known (for example, Patent Document 1).

JP 2019-089491 A (paragraphs [0025], [0026], Figure 1)

By the way, there is an opening on the side of the engine room of a vehicle to allow the drive shafts and tie rods of the wheels to pass through, so the engine noise leaks through the opening, passing under the side member and to the side of the vehicle. . However, since such engine noise leaking to the sides cannot be suppressed by the conventional fender liner described above, there is a need for the development of a technique for suppressing engine noise leaking to the sides.

A first aspect of the invention made to solve the above problems is a fender liner having an inner wall overlaid on an outer surface of a side member of a vehicle, the fender liner extending from a lower end of the inner wall toward the engine side of the vehicle. , a noise reflecting section disposed overlappingly on the lower surface of the side member; and a sound reflecting surface formed on the noise reflecting section and inclined with respect to the vertical direction so as to move downwardly as it moves away from the engine laterally. The fender liner is equipped with a fender liner that reflects engine sound received by the sound reflecting surface downward to interfere with engine sound passing below the side member. Here, the side members include both a side member that extends over substantially the entire longitudinal direction of the vehicle, and a front side member that extends in the longitudinal direction in the engine room of the vehicle.

A second aspect of the invention is the fender liner according to the first aspect , wherein the sound reflecting surface is an arcuate surface with a radius of curvature of 20 to 30 [mm] and a circumferential length of 30 to 50 [mm].

A third aspect of the invention is the sound reflecting surface according to the first aspect, wherein the sound reflecting surface is a flat surface having an inclination angle of 40 to 50 [DEG] in the vertical direction and a dimension in the vertical direction of 20 to 30 [mm]. It's a fender liner.

In a fourth aspect of the invention , the inner wall is divided into two parts in the front and back by a notch that extends from the lower end of the inner wall to the upper surface of the fender liner and receives a shock absorber, and the noise reflecting part is arranged in the cutout. The fender liner according to any one of the first to third aspects, wherein the fender liner is arranged in front and back with the fender liner sandwiched therebetween.

In a fifth aspect of the invention , the noise reflecting portion includes a bent protrusion that is bent from a lower end of the inner wall and overlapped with the lower surface of the side member, and an integral hinge at the tip of the bent protrusion. a sound reflecting plate bent about the integral hinge as a fulcrum so as to overlap the lower surface of the bent protrusion, one of the front and back surfaces of the sound reflecting plate serving as the sound reflecting surface. The fender liner according to any one of the first to fourth aspects .

In a sixth aspect of the invention , the noise reflecting section includes an extension wall extending downward from the inner wall and protruding below the lower surface of the side member, and an integral hinge at the lower end of the extension wall. a sound reflecting plate bent about the integral hinge so as to overlap the surface facing the engine side of the extension wall, one of the front and back surfaces of the sound reflecting plate being The fender liner according to any one of the first to fourth aspects, wherein the fender liner has a reflective surface.

A seventh aspect of the invention is the fender liner according to the sixth aspect , wherein the reflecting plate has a mounting hole through which a fastening member for fixing to the side member is passed.

According to the fender liner of the first aspect of the invention , a part of the engine sound directed from the engine to the side is reflected by the sound reflecting surface of the noise reflecting part provided on the lower surface of the side member and directed downward. , below the noise reflecting part, intersects and interferes with the engine sound traveling straight from the engine to the side, out of phase. This suppresses engine noise that passes below the side members and leaks to the sides.

Here, the phase of the engine sound reflected by the noise reflector and the engine sound passing below the side member is determined to reduce the noise level of the highest frequency sound among the engine sounds leaking to the sides of the vehicle. It is preferable to shift the For this purpose, when the vehicle is a regular car, the sound reflecting surface may be either an arcuate surface or a flat surface as long as it is inclined with respect to the vertical direction so as to go downward as it moves away from the engine laterally. Further, when the sound reflecting surface is an arcuate surface, it is preferably an arcuate surface with a radius of curvature of 20 to 30 [mm] and a circumferential length of 30 to 50 [mm ] . ), When the sound reflecting surface is a flat surface, it is preferably a flat surface with an inclination angle of 40 to 50 [DEG] in the vertical direction and a dimension of 20 to 30 [mm] in the vertical direction ( Third aspect of the invention ).

The noise reflecting part includes a bent protrusion that is bent from the lower end of the inner wall of the fender liner and overlapped with the lower surface of the side member, and is connected to the tip of the bent protrusion via an integral hinge, and is connected to the lower surface of the bent protrusion. A sound reflecting plate bent using an integral hinge as a fulcrum so as to overlap the sound reflecting plate may be provided, and one of the front and back surfaces of the sound reflecting plate may be a sound reflecting surface (a structure according to the invention) . (fifth aspect ), an extension wall extending downward from the inner wall and protruding below the lower surface of the side member; and an extension wall connected to the lower end of the extension wall via an integral hinge, and extending from the engine side of the extension wall. A sound reflecting plate bent around an integral hinge so as to overlap the facing surface may be provided, and one of the front and back surfaces of the sound reflecting plate may be a sound reflecting surface ( invention (6th aspect ). In the case of this structure, as in the fender liner of the seventh aspect of the invention , mounting holes may be formed in the sound reflecting plate and the sound reflecting plate may be fixed to the side member via a fastening member.

In the configuration of the fourth aspect of the invention , since the noise reflecting section is arranged separately on the front side and the rear side with the shock absorber in between, interference between the noise reflecting section and the shock absorber is avoided, and the noise reflecting section is Greater freedom in size.

A front sectional view of the front part of a vehicle equipped with a noise reflecting section according to the first embodiment Plan view of the wheel house viewed from above the vehicle Perspective view of the wheel house from the front of the vehicle with the fender liner removed Perspective view of the fender liner seen from the rear of the vehicle Diagram showing the flow of engine sound from the side opening to the side Enlarged front sectional view of a fender liner equipped with a noise reflecting section according to a second embodiment Enlarged front sectional view of a fender liner with a noise reflecting part according to another embodiment Enlarged front sectional view of a fender liner with a noise reflecting part according to another embodiment (A), (B) Enlarged front sectional view of a fender liner equipped with a noise reflecting part according to another embodiment

[First embodiment]
Hereinafter, a first embodiment of a vehicle 90 having a fender liner 22 of the present disclosure will be described with reference to FIGS. 1 to 5. A vehicle 90 according to the present embodiment shown in FIG. 1 is, for example, a passenger car in which an engine 95 is mounted at the front and front wheels 91 are driven. The engine room 93 of this vehicle 90 has cover walls 92A and 92B on both sides and a lower part, so that sound leakage to the sides and downwards is suppressed. Further, a front side member 20 is disposed on the outside of the side cover wall 92A, and a sub-frame 21 is disposed directly below the front side member 20, overlapping the top surface of the cover wall 92B. There is. Furthermore, a side opening 92C is formed between the front side member 20 and the subframe 21 by cutting out a part of the cover wall 92A, and the drive shaft 31 of the front wheel 91 and the tie rod 32 are connected to the side opening 92C. It is led out from the engine room 93 to the wheel house 96 of each front wheel 91 via. A fender liner 22 is provided inside the wheel house 96 of each front wheel 91.

The fender liner 22 of this embodiment is, for example, an injection molded product of an olefin thermoplastic resin such as polypropylene or polyethylene, and includes an inner wall 22B that overlaps the outer surface of the front side member 20 as shown in FIG. There is. Furthermore, a shock absorber 33 for the front wheel 91 passes through the top of the arcuate wall 22A that covers the front wheel 91 from above in the fender liner 22. A notch 23 for passing through extends from the top of the arcuate wall 22A to the lower end of the inner wall 22B, as shown in FIG.

The lower end of the inner wall 22B is located, for example, in the middle of the arcuate wall 22A in the vertical direction, and the lower end surface of the inner wall 22B extends horizontally with both sides of the notch 23 being flush with each other. Also, mounting holes 24 are provided on both sides of the inner wall 22B with the notch 23 in between, at positions apart from the lower end of the inner wall 22B, and the fastening members B passed through the mounting holes 24 are attached to the inner wall 22B. is fixed to the front side member 20.

As shown in FIG. 1, the lower end of the inner wall 22B protrudes downward from the front side member 20, is located above the drive shaft 31 and tie rod 32, and faces the side opening 92C. A pair of sound reflection plates 11 are provided in layers on the inner wall 22B at the portions facing the side opening 92C on both sides of the notch 23C (see FIG. 4). Hereinafter, portions of the inner wall 22B that protrude downward from the front side member 20 on both sides of the notch 23 will be referred to as a pair of extension wall portions 12.

As shown in FIG. 4, each sound reflection plate 11 has a cross-sectional shape of 1/4 circle and extends in the front-rear direction, and its outer peripheral surface meets the lower surface of the front side member 20 and the extension wall portion 12 as shown in FIG. It is arranged so as to be in contact with the surface facing the side opening 92C. Further, the lower end of the sound reflection plate 11 is connected to the lower end of the extension wall portion 12 via an integral hinge 30. Furthermore, as shown in FIG. 4, a pair of mounting holes 12B are provided in the upper part of the sound reflection plate 11. As shown in FIG. 5, each attachment hole 12B has a counterbore structure in which the lower surface side is counterbored, and a pedestal portion 11D protrudes from the upper opening edge of the attachment hole 12B. The sound reflecting plate 11 is fixed to the lower surface of the front side member 20 by a fastening member B (for example, a bolt, nut, rivet, screw, nylatch, etc.) passed through the mounting hole 12B. The sound reflecting plate 11, the integral hinge 30, and the extension wall 12 constitute the noise reflecting part 10 of the claims, and the sound reflecting surface 11A, which is the inner peripheral surface of the sound reflecting plate 11, has a side opening. It receives the sound leaking to the side from 92C and reflects it downward.

Note that the radius of curvature of the sound reflecting surface 11A is preferably 20 to 30 [mm], and the circumference thereof is preferably 30 to 50 [mm], for example. Furthermore, although the fender liner 22 of this embodiment is, for example, an injection molded product of resin, it may be a vacuum molded product. Furthermore, the fixing of the fender liner 22 to the front side member 20 is not limited to a fastening member, but may be an adhesive.

Next, the effects of the noise reflecting section 10 of this embodiment will be explained. Engine noise generated in the engine room 91 and directed to the side leaks to the outside of the vehicle through the side opening 92C, passing between the front side member 20 and the subframe 21. In this embodiment, the fender liner 22 is provided with a pair of noise reflecting parts 10, and the sound reflecting surface 11A of the noise reflecting part 10 is arranged on the lower surface of the front side member 20 so as to face into the side opening 92C. It has a similar structure. Therefore, as shown in FIG. 5, the path of the engine sound going to the side from the side opening 92C is a first path 15R passing through the sound reflecting surface 11A, and a first path 15R passing through the sound reflecting surface 11A. It passes through the lower part, goes straight, and separates into a second route 16R that is discharged outside the vehicle.

The engine sound passing through the first path 15R is reflected by the sound reflecting surface 11A of the noise reflecting section 10 and heads downward. Then, it merges with the engine sound traveling straight through the second route 16R. The wavelength of the engine sound reflected by the sound reflecting surface 11A is out of phase with the wavelength of the engine sound traveling straight, so when they merge, they interfere with each other. Thereby, engine noise is reduced below the front side member 20 before it leaks outside the vehicle.

Here, by lowering the noise level of the sound with the highest frequency among the engine sounds leaking outside the vehicle, the overall noise level of the engine sound can be lowered. Therefore, it is desirable to reduce the sound in the frequency band of 800 to 1250 [Hz], which is the peak of engine sound. As in this embodiment, if the radius of curvature of the sound reflecting surface 11A is 20 to 30 [mm] and the circumference is 30 to 50 [mm], the frequency range centered on the frequency band 800 to 1250 [Hz] A good reduction effect can be obtained.

Furthermore, in this embodiment, two parts, the sound reflection plate 11 and the extension wall part 12, are connected via an integral hinge 30. That is, when used, these two parts, which are cut out in different directions, are integrally molded by being cut out in the same direction during molding. Then, after molding, by rotating the integral hinge 30, it can be placed in the position for use. In this way, two parts that are originally cut out in different directions can be cut out in the same direction and integrally molded, so that manufacturing costs can be reduced.

Furthermore, if the noise reflecting part 10 is placed inside the front side member 20, it may interfere with various auxiliary equipment, and if it is placed outside the front side member 20, it may interfere with the shock absorber 33. In this embodiment, since the noise reflecting section 10 is arranged below the front side member 20, there is no possibility of interference with these parts, and the degree of freedom in the shape of the noise reflecting section 10 is increased.

[Second embodiment]
Next, a fender liner 22V according to a second embodiment to which the present disclosure is applied will be described. In the following description, only the differences from the first embodiment will be described, and redundant description of common configurations will be omitted.

As shown in FIG. 6, the fender liner 22V of this embodiment includes a bent protrusion 13 that is bent from the lower end of the inner wall 22B and overlapped with the lower surface of the front side member 20. Further, the sound reflecting plate 11V is connected to the tip of the bent protrusion 13 via an integral hinge 30, and is stacked on the lower surface of the bent protrusion 13. Furthermore, a pair of mounting holes 13B are formed in the bending protrusion 13 at positions facing the pair of mounting holes 12B of the sound reflection plate 11V, and a fastening member B passed through the mounting holes 12B and 13B allows the bending The protruding piece 13 and the sound reflection plate 11V are fixed to the front side member 20. A noise reflecting portion 10V is constituted by the bent protrusion 13, the integral hinge 30, and the sound reflecting plate 11V.

[Other embodiments]
(1) In the above embodiment, the sound reflecting surface 11A of the noise reflecting section 10 or 10V is an arcuate surface, but as shown in FIG. 7, the sound reflecting surface 11A of the noise reflecting section 10W has a side opening 92C. It may be formed of a flat surface that faces toward the side and slopes away from the engine 30 as it goes downward. It is preferable that this flat surface has an inclination angle of 40 to 50 [DEG] with respect to the vertical direction and a dimension of 20 to 30 [mm] in the vertical direction.

(2) In the above embodiment (1), the sound reflection plate 11W was configured to be connected to the bent protrusion 13 via the integral hinge 30, but as shown in FIG. The lower end portion may be bent at two places to form a portion that overlaps the lower surface of the front side member 20 and a portion that forms the sound reflecting surface 11A. In this case, by providing a rib portion 31 that interconnects the lower surface of the first wall portion 14A that overlaps the lower surface of the front side member 20 and the outer surface of the second wall portion 14B that constitutes the sound reflecting surface 11A, The inclination angle of the sound reflecting surface 11A can be fixed.

(3) In the above embodiment, the noise reflecting section 10 is integrally formed with the fender liner 22, but as shown in FIG. 9(A), it may be formed separately from the fender liner 22X. In this case, the lower end portion of the inner wall 22XB of the fender liner 22X may be configured to protrude below the lower surface of the front side member 20, and the noise reflecting portion 10X may be attached to the protruding portion.

Further, as shown in FIG. 9(B), the lower end portion of the inner wall 22YB of the fender liner 22Y is bent and overlapped with the lower surface of the front side member 20, and the noise reflecting portion 10Y is attached to the overlapped portion. It may be.

(4) In the above embodiment, the noise reflecting section 10 provided in the fender liner 22 is arranged below the front side member 20 extending in the longitudinal direction in the engine compartment 93 of the vehicle 90 in which the engine 95 is mounted at the front. However, the vehicle 90 may include an engine 95 other than the front, and the engine 95 may be disposed on the lower surface of a side member extending substantially over the entire longitudinal direction of the vehicle 90.

(5) In the above embodiment, the present invention is applied to the vehicle 90 equipped with the engine 95, but it may also be applied to an electric vehicle equipped with a motor or a hybrid vehicle equipped with a motor and an engine.

10 Noise reflecting section 11A Sound reflecting surface 20 Front side member (side member)
22 Fender liner 22B Inner wall 90 Vehicle 95 Engine

Claims (7)

A fender liner having an inner wall overlaid on an outer surface of a side member of a vehicle, the fender liner comprising:
a noise reflecting section that extends from a lower end of the inner wall toward the engine or motor of the vehicle and is disposed overlapping the lower surface of the side member;
a sound reflecting surface formed on the noise reflecting part and inclined with respect to the vertical direction so as to move downward as it moves away from the engine or motor to the side;
A fender liner that reflects engine sound or motor sound received by the sound reflecting surface downward to interfere with engine sound or motor sound passing below the side member. The fender liner according to claim 1, wherein the sound reflecting surface is an arcuate surface having a radius of curvature of 20 to 30 [mm] and a circumferential length of 30 to 50 [mm]. The fender liner according to claim 1, wherein the sound reflecting surface is a flat surface having an inclination angle of 40 to 50 [DEG] in the vertical direction and a dimension of 20 to 30 [mm] in the vertical direction. The inner wall is divided into two in front and back by a notch that extends from the lower end of the inner wall to the upper surface of the fender liner and receives a shock absorber,
The fender liner according to any one of claims 1 to 3, wherein the noise reflecting portions are arranged one behind the other with the notch in between. The noise reflecting portion includes a bent protrusion that is bent from a lower end of the inner wall and overlapped with the lower surface of the side member, and a bent protrusion that is connected to a distal end of the bent protrusion via an integral hinge. a sound reflecting plate bent about the integral hinge so as to overlap the lower surface of the sound reflecting plate, and one of the front and back surfaces of the sound reflecting plate is the sound reflecting surface. A fender liner according to any one of claims. The noise reflecting section includes an extension wall that extends downward from the inner wall and projects below the lower surface of the side member, and a lower end of the extension wall that is connected to the extension wall via an integral hinge. a sound reflecting plate bent around the integral hinge so as to overlap a surface facing the engine or motor side of the unit, and one of the front and back surfaces of the sound reflecting plate is the sound reflecting surface. The fender liner according to any one of claims 1 to 4. A fender liner placed in a wheel house of a vehicle,
a noise reflecting part disposed overlappingly on the lower surface of the side member of the vehicle;
The noise reflecting portion is a fender liner including a sound reflecting surface that slopes in the vertical direction so as to move downward as it becomes further away from the engine or motor of the vehicle .

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