JP2700295B2 - Vibration damping structure of vehicle body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping structure for a vehicle body, and more particularly to a structure for damping vibration transmitted from a suspension into a vehicle interior.

[0002]

2. Description of the Related Art In a suspension structure shown in FIGS. 1 and 5, a vibration input generated between a road surface and a tire 101 of a wheel 1 is caused by a shock absorber 4 provided with an upper arm 2B of a suspension S and a coil spring 5. From the lower arm 2A to the side member 9 through the chassis cross member 3 on the other hand. The road noise is generated in the vehicle cabin when these vibration inputs are finally transmitted to the dash panel 11 and vibrate.

[0003] Conventionally, vibration in a vehicle cabin due to road noise,
Measures to reduce the noise level and increase quietness include suppression of vibration by increasing the rigidity of the panel, suppression of vibration by the mass effect of a melt sheet, etc., and suppression of radiated sound by a silencer, all of which involve increased costs and increased vehicle weight. However, this is not always an effective measure.

As a countermeasure against a vibration source at the suspension mounting portion, a floating structure using a rubber bush can be used. However, the use of an elastic body causes a decrease in steering stability and the like. Has a limit.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to improve the quietness by reducing the vibration transmitted from the suspension to the vehicle body without increasing the weight of the vehicle, at a low cost and without impairing the steering stability.

[0006]

SUMMARY OF THE INVENTION The present invention has been made by paying attention to the fact that a rubber-modified epoxy resin adhesive has a high adhesive force and a vibration absorbing performance (Japanese Patent Application Laid-Open No. 3-294329). A rubber-modified epoxy resin adhesive layer is interposed at the panel joint of the vehicle body structural member between the member receiving the vibration input and the vehicle compartment.

FIG. 1 shows a place where the adhesive layer 10 is provided.
And between the bracket 6 receiving the upper end of the coil spring 5 of the suspension S via the spring seat 501 and the panel of the spring house 8 as shown in FIG.
The first joint portion, and as shown in FIGS. 1 and 3 spray
The second joint between the dash panel 11 and the fender shield 7 of the engine room connected to the ring house 8 is particularly effective. Suspension arm 2A is connected
Between the side-on member 9 and the dash panel 11 of the vehicle body
The third joint (not shown) between them is also effective. Then book
The invention provides at least one of the first, second, and third joints.
Also, the resin adhesive layer is provided on the first joint and the second joint.
Intervene.

Examples of the rubber-modified epoxy resin adhesive include, for example, (a) an acrylonitrile-butadiene copolymer having an epoxy resin as a main component and polar groups at both terminals, and (b) a meta-polymer having at least one acryloyl group. A resin composition containing an acrylate, (c) an organic peroxide, (d) an epoxy resin curing agent, and the like. 10 to 80 parts by weight of component (a), 5 Those containing up to 50 parts by weight are suitably used. This adhesive also has excellent adhesive strength and a small mechanical loss coefficient depending on the environmental temperature. The thickness of the adhesive layer is suitably about 0.2 to 4.0 mm.

[0009]

By interposing the epoxy resin adhesive layer was rubber-modified to the panel joints of the members in the vibration path into the passenger compartment from the member for receiving the [action] suspension, leading to the passenger compartment occurs between the road surface and the tire Attenuates vibration and reduces noise levels in the cabin.

[0010]

1 to 3 show an embodiment in which the present invention is applied to a front suspension of a vehicle. FIG.
As shown in FIG. 2, the lower end of the shock absorber 4 of the suspension S is rotatably supported by a lower arm 2A connecting the wheel 1 and the chassis cross member 3, and the upper portion is supported by an upper arm 2B. Suspension 4
A strut 401 and a piston rod 402 are provided. A coil spring 5 having a lower end connected to the stradd 401 and an upper end received by a spring seat 501 is provided around the shock absorber 4.

[0011] Fender shield 7 on the side of the engine room
A hole 802 is formed in the center of the top surface (suspension receiving surface) 801 of the spring house 8 integrally formed on the upper surface, and the bracket 6 is overlapped concentrically on the lower surface side. is recieving. Joint of the receiving surface 801 and the bracket 8 (first joint)
Then, there are three recesses 8 around the hole 802 of the receiving surface 801
03 is formed and is in close contact with the upper surface of the bracket 6,
Both panels are spot-welded in the recess 803. Recess 8
Other than 03, there is a gap of about 0.5 to 2.0 mm in substantially the entire area between the receiving surface 801 and the bracket 6. This gap is filled with a rubber-modified epoxy resin adhesive, and the panels 6 and 801 are firmly connected via the adhesive layer 10.

As shown in FIGS. 1 and 3, a rubber-modified epoxy resin adhesive is also applied to a panel joint (a second joint) of the dash panel 11 for separating the fender shield 7 from the engine room and the vehicle compartment. Layer 10 is interposed.

In addition to the vibration transmission path from the spring house 8 to the dash panel 11, the lower arm 2A
Also, in the vibration transmission path from the dash panel 11 to the dash panel 11 through the chassis cross member 3 and the side member 9, the panel joint (the third
A rubber-modified epoxy resin adhesive layer is interposed at the junction (not shown) (not shown). Although the vibration damping effect can be obtained by providing the adhesive layer only in the former vibration transmission path, a greater effect can be obtained by providing the adhesive layer in both vibration transmission paths.

According to the present invention, the structure in which the adhesive layer is interposed at the panel joint, the spring house 8 and the bracket 6, the fender shield 7 and the dash panel 11, and the side member 9 and the dash panel 11 are each simply spot-welded. A hammering test was performed on the vehicle having the conventional structure combined.

FIG. 4A shows a measurement result of the dash panel on the engine room side. The structure of the present invention has a better vibration reducing effect than the conventional structure. Also, it can be seen that there is an effect on vibration convergence. The noise reduction effect improves the quietness of the vehicle interior, and the vibration convergence effect speeds up the elimination of the sound when riding over a projection during running.

FIG. 4B shows the results of measurement of the relationship between the vibration level and the frequency in the vicinity of the driver's seat, and the structure of the present invention shows a feeling of oppression, turbidity, and noisiness in the cabin. The vibration level is lower than that of the conventional structure in almost the entire range of the frequency of 500 Hz.

Since the adhesive layer having a high adhesive force is interposed between the panel joints, the rigidity of the panel joints is enhanced, so that the number of spot welding points can be reduced. On the other hand, the shape is responsible for the strength in a wide range, the stress is dispersed and the durability is improved.

[0018]

According to the present invention, the vibration transmitted from the suspension to the passenger compartment can be absorbed and reduced at low cost without increasing the weight of the vehicle and without modifying the conventional basic structure, thereby improving the quietness of the vehicle.

[Brief description of the drawings]

FIG. 1 is a perspective view of a vehicle body to which the present invention is applied.

FIG. 2A is a cross-sectional view of a suspension support having a vibration damping structure according to the present invention, taken along a line II-II in FIG. 1, and FIG. Part enlarged plan view, FIG. 2
FIG. 2C is a sectional view taken along the line CC of FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a diagram showing test results for the structure of the present invention and the conventional structure.

FIG. 5 is a diagram corresponding to FIG. 2A of a conventional structure.

[Explanation of symbols]

S Suspension 1 Wheel 2A, 2B Suspension arm 3 Cross member 4 Shock absorber 5 Coil spring 6 Bracket 7 Fender shield panel 8 Spring house 9 Side member 10 Adhesive layer 11 Dash panel

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hide Fukudome 5-33-8 Shiba, Minato-ku, Tokyo Inside Mitsubishi Motors Corporation (72) Inventor Shuji Ohno 5-33-8 Shiba, Minato-ku, Tokyo No. Mitsubishi Motors Corporation (72) Inventor Hideki Yoshioka 5-33-8 Shiba, Minato-ku, Tokyo Mitsubishi Motors Corporation (72) Inventor Yoshihiro Aoi 5-33-8 Shiba, Minato-ku, Tokyo No. Mitsubishi Motors Corporation (72) Inventor Taiji Odamura 4-59-9 Higashigotanda, Shinagawa-ku, Tokyo Inside Cemedine Co., Ltd. (72) Inventor Takeshi Arai 4-5-1 Higashigotanda, Shinagawa-ku, Tokyo No. 9 Inside Cemedine Co., Ltd. (72) Inventor Masatoshi Takaba 1 Ochaya, Hashime-cho, Okazaki City, Aichi Prefecture Inside Futaba Sangyo Co., Ltd. (72) Inventor Shoji Ando Character, Hashime-cho, Okazaki City, Aichi Prefecture Chaya address 1 off tobacco industry in Inc. (56) References Patent Sho 63-205380 (JP, A) Patent Rights 5-271640 (JP, A) JitsuHiraku flat 1-87967 (JP, U)

Claims (1)

(57) [Claims] 1. A panel joint portion of the vehicle body structure member between the member and the passenger compartment for receiving the input of vibration from the suspension
Support the upper end of the suspension coil spring
A first joint between the bracket and the spring house,
Engine room fender connected to the spring house
Between the shield and the dash panel that partitions the front of the cabin
The second joint and the suspension arm are connected
Third joint between a side member and the dash panel
A vibration damping structure for a vehicle body , wherein a rubber-modified epoxy resin adhesive layer is interposed at least in the first and second joint portions of the vehicle body.