JPH08326836A - Vibration suppressing device - Google Patents

Abstract

PURPOSE: To economically and inexpensively reduce noise caused by audiofrequency vibration generated from a member which generates vibration when it is subjected to friction. CONSTITUTION: A vibration damping panel 3 having a multi-layer structure which can be finely displaced in a shearing direction is interposed between a vibrated member 2 as a noise source and a weight 1, and a space is formed in the vibration damping panel 3 by bending at a position where the weight is attached. Vibration generated in the vibrated member is transmitted to the vibration damping panel 3 which is therefore deformed in the shearing direction by being subjected to a load caused by the weight l. This deformation converts a vibration energy into a thermal energy so as to damp the audiofrequency. Accordingly, the vibration damping device has a structure which is mechanically tough, and which does not substantially cause aging effect even though it is subjected to thermal shocks, and thereby it is possible to suppress generated noise.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention was developed to prevent noise in a brake device for an automobile, but can be widely used for suppressing noise in a device that generates noise due to vibration.

According to the present invention, a member for generating noise at an audible frequency due to friction or other causes is attached with a mass weight located at a position corresponding to the abdomen of the vibration so that the natural frequency of the vibration is lower than the audible frequency. Therefore, the present invention relates to improvement of technology for reducing noise.

[0003]

BACKGROUND ART Brake shoes, brake drums,
Regarding the technique of reducing the noise by loading a weight on a member that generates noise due to friction among the brake discs and other members of the brake device, the applicant of the present invention filed Japanese Patent Application No. 6-
No. 210204, Japanese Patent Application No. 6-210206, Japanese Patent Application No. 6
-265666, Japanese Patent Application No. 6-269766, Japanese Patent Application No. 6-269791, Japanese Patent Application No. 6-269816 (hereinafter referred to as "prior application".
Applied for a patent.

The above-mentioned technique observes the vibration state of a member that generates noise due to friction, attaches a weight so as to load a concentrated mass at a position corresponding to the antinode of the vibration, and lowers the natural frequency of the vibration. This is a technology that substantially reduces noise. The inventor of the present application repeated a number of tests on this technique and experimentally confirmed that the effect is extremely large as compared with the conventional brake noise reduction technique.

The above-mentioned prior application discloses a structure in which rubber or other elastic material is interposed between the weight and the brake shoe when the weight is attached to the brake shoe, which is effective for noise prevention. I explained that.

[0006]

However, most of the elastic materials generally obtained economically have poor heat resistance. For example, an inexpensive rubber material is not always suitable as a material for a brake member because it deteriorates rapidly if repeatedly exposed to a temperature change between temperatures exceeding 100 ° C. and room temperature. In other words, when materials such as rubber are used, the change over time is large, and no noise was generated when a new car was used.
There is an inconvenience that noise increases as the years of use increase.

On the other hand, a damping steel plate in which a metal or non-metal layer of an elastic material is formed in a sandwich shape between two steel plates is known, and when this is attached to a brake shoe, for example, It was found that the bending vibration amplitude of the brake shoe was small, and the displacement of the sandwich structure in the shearing direction due to bending was small, so that the desired noise reduction effect was not necessarily obtained. Therefore, when a small vibration is applied to the vibration damping steel plate in the vertical direction, bending vibration with a small curvature of the vibration damping steel plate is caused, and as a result, the shear displacement of the vibration damping steel plate is increased to efficiently damp the vibration. Therefore, it has been experimentally found that even if the weight of the weight loaded on the abdomen of the vibration is reduced, the vibration natural frequency is lowered and the effect is large.

The present invention has been made against such a background, and it has a great effect of preventing noise, does not deteriorate even if a temperature cycle is applied, and uses a comparatively expensive material in an extremely small area. (EN) Provided is an apparatus which is economical, has a simple structure and shape, and is not deformed even by a severe vibration caused by traveling of a vehicle, and can effectively reduce noise by loading a small mass. With the goal.

INDUSTRIAL APPLICABILITY The present invention can be mounted in a space inside a practical brake device and is mechanically robust.
An object of the present invention is to provide a noise reduction device that is less likely to be disturbed by dust and the like and that hardly changes over time.

An object of the present invention is to provide a brake device capable of significantly reducing noise due to friction.

[0011]

According to the present invention, a weight is attached to a member that generates noise at an audible frequency due to friction or other causes via a damping plate, and the natural frequency of the vibration is made lower than the audible frequency. Therefore, it is characterized by reducing noise.

That is, a first aspect of the present invention is a vibration damping device in which a weight is loaded in the vicinity of a vibration abdomen of a vibration-damped member that is a noise source, and a weight is provided between the weight and the vibration-damped member.
A vibration damping plate having a multi-layer structure that can be slightly displaced in the shearing direction is interposed, and the vibration damping plate is formed so that a space is formed between the vibration damping plate and the member to be damped at the position where the weight is attached. The plate is formed by bending.

The vibration-damped member is a member constituting a vehicle brake device, and the vibration-damping plate having the multi-layer structure includes a layer of an elastic material in one of the layers, and the position where the space is formed. It is desirable that the weight be loaded substantially at the center of the, or the weight be loaded at a position deviated from the center of the position where the space is formed. It is also possible to have a structure in which the weight is housed in the space, and further, it is provided with a cover for covering the damping plate and the weight, or in the space, an elastic body that can be effectively regarded as a space against vibration. Can be filled.

A second aspect of the present invention is a brake device in which a weight is loaded in the vicinity of a vibration abdomen of a member that generates noise due to friction, in a shearing direction between the weight and the member that generates noise. A damping plate having a multi-layer structure that can be displaced minutely was interposed, and the damping plate was bent and formed so that a space was formed between the damping plate and its member at the position where the weight was attached. It is characterized by

[0015]

[Operation] A weight is attached to the damping plate to be mounted in advance, and the natural frequency of the damping plate is made lower than the lower limit value (f _L ) of the vibration frequency of the vibration-damped member by using a vibration tester. Set the weight of the weight and mount it on the damping member. When the vibration-damped member receives vibration due to friction or some other reason, the vibration is transmitted to the vibration-damping plate, but the weight of the weight is adjusted so that the natural vibration frequency of the weight is below the lower limit of the natural vibration frequency of the vibration-damped member. Is set, the damping plate is slightly displaced in the shearing direction in the space between the damping member and the damping member. By repeating this displacement, vibration energy is converted into heat energy and is radiated into the atmosphere.

As a result, the vibration of the audible frequency received by the vibration-damped member can be attenuated, and the generation of annoying noise such as squeal of the brake can be suppressed. Also,
Its structure is mechanically solid because it is a simple structure in which a weight is simply attached to a vibration-damped member via a vibration-damping plate, and therefore deterioration and deformation due to thermal shock, vibration, etc. are small,
Further, since it is possible to limit the portion where the expensive vibration damping plate is used to a small size, it is possible to implement economically.

As the vibration-damped member, a member constituting a brake device of a vehicle, for example, a member such as a rim or web of a brake shoe, a brake drum, a caliper, a wheel cylinder, or the like, which vibrates due to friction, is targeted. The effect is remarkable.

Since the multilayer vibration damping plate includes a layer of an elastic material as one of the layers, displacement in the shearing direction easily occurs when vibration is transmitted, which causes vibration energy to be heated. It can be converted into energy and noise due to vibration at an audible frequency can be suppressed.

If the weight is loaded almost at the center of the vibration damping plate in which a space is formed, a displacement during vibration can be effectively generated, and if it is loaded at a position deviated from the center, the weight is damped. Since the rigidity distribution of is non-uniform, a secondary mode or higher mode occurs at a frequency lower than the lower limit (f _L ) of the vibration frequency of the vibration-damped member, and the bending curvature of the damping plate becomes small. The deformation in the shearing direction becomes large, and vibrations in a wide frequency range can be damped.

Depending on the structure, it may not be possible to attach a weight to the outside of the damping plate described above, but if there is such a limitation, the same effect can be obtained by accommodating the weight in the space created by bending. Obtainable.

Since dust easily enters the space between the damping plate and the member to be damped, a cover for covering the damping plate and the weight is provided to prevent this, or the vibration of the damping plate is vibrated. On the other hand, it is possible to effectively fill an elastic body that can be regarded as a space, and it is possible to prevent deterioration of the function due to intrusion of dust without deteriorating the vibration damping effect.

The vibration damping device according to the present invention can be used to suppress the noise of various devices that generate noise due to vibrations, and in particular, to a braking device that generates vibrations due to friction every time braking is performed. If used, a great effect can be obtained.

[0023]

Embodiments of the present invention will now be described with reference to the drawings.

(First Embodiment) FIG. 1A is a plan view showing the structure of a first embodiment of the present invention, and FIG. 1B is a side view thereof.

In the first embodiment of the present invention, between the weight 1 for suppressing the vibration and the vibration-damped member 2 serving as the noise source, the vibration of a multi-layer structure capable of being finely displaced in the shearing direction indicated by the solid arrow. A vibration damping steel plate 3 is interposed as a plate, and the vibration damping steel plate 3 is bent to form a space 4 between the vibration damping steel plate 3 at the position where the weight 1 is attached and the vibration-damped member 2. The vibration-damping steel plate 3 can be obtained by molding a commercially available material, and in this embodiment, a structure in which an elastic material layer 3b is arranged between two steel plates 3a is shown. The elastic material layer 3b is made of metal or nonmetal. In the case of metal, it is, for example, a steel alloy. In the case of non-metal, it is a polymer material such as polyethylene or elastomer. A material having a multilayer structure in which a plurality of steel plates 3a and elastic material layers 3b are laminated may be used.

The damping steel plate 3 is fixed to the vibration-damped member 2 by spot welding, but it can also be fixed by rivets or bolts and nuts. Also,
The weight 1 is fixed to the upper surface of the outer side of the vibration-damping steel plate 3, which is substantially the center of the position where the space 4 is formed, by an adhesive or welding. A rivet or bolts and nuts can be used to fix the weight 1.

The weight 1 to be used is loaded on a vibration-damping steel plate 3 fixed to a vibration tester and is given a vibration, so that the vibration-damping steel plate is lower than the lower limit value (f _L ) of the vibration frequency of the vibration-damped member 2. The weight is set in advance so that the natural frequency of 3 becomes low. When the vibration-damping steel plate 3 receives the vibration generated in the vibration-damped member 2, the natural vibration frequency of the vibration-damping steel plate 3 is lower than the lower limit value (f _L ) of the vibration frequency of the vibration-damped member 2, so that the weight 1 The vibration-damping steel plate 3 under load is slightly displaced as shown by the broken line in FIG. In FIG. 2, the swing width is enlarged and displayed for easy understanding of the displacement state.

Due to this minute displacement, the vibration-damping steel plate 3 is repeatedly displaced in the shearing direction between the steel plate 3a and the elastic material layer 3b, and the heat generated by converting the vibration energy into heat energy is generated. Dissipates into the atmosphere. Even if the vibration-damping steel plate 3 is displaced in the shearing direction, the space 4 is formed between the vibration-damping member 3 and the vibration-damped member 2. Since there is no contact due to displacement, sound is not transmitted to the outside.

(Second Embodiment) FIG. 3A is a plan view showing the structure of a second embodiment of the present invention, and FIG. 3B is a side view thereof.

In the second embodiment of the present invention, one damping steel plate 13 is used.
A plurality of spaces 4 are formed in the space, the weights 1 are attached to the upper surface, which is substantially the center of each space 4, with an adhesive, and the vibration-damping steel plate 13 is fixed to the vibration-damped member 2 at a plurality of places by spot welding. Also in the case of the second embodiment, the weight 1 and the damping steel plate 13 can be fixed by rivets or bolts and nuts. Further, similarly to the first embodiment, the damping steel plate 13 may have a multi-layer structure other than the structure including the elastic material layer 13b between the two steel plates 13a. Also in the case of the second embodiment, each weight 1
This is effective in the case where the weight is set in advance as in the first embodiment, the width of the vibration-damped member 2 is narrow, and the volume required for vibration damping cannot be secured in one place. Further, by making the pitches of the plurality of weights 1 irregular, it is possible to suppress vibrations in a wide frequency range.

(Third Embodiment) FIG. 4A is a plan view showing the configuration of a third embodiment of the present invention, and FIG. 4B is a side view thereof.

In the third embodiment of the present invention, the weight 1 in the first embodiment is loaded at a position deviated from the center position of the space 4 formed in the vibration damping steel plate 3, and the other constructions are the same as in the first embodiment. It In the case of the third embodiment, since the loading position of the weight 1 is lopsided, the rigidity distribution of the vibration damping steel plate 3 becomes non-uniform, so that when vibration is applied, as shown by the broken line in FIG. In addition, a secondary mode or a higher mode is generated at a frequency lower than the lower limit value (f _L ) of the vibration frequency of the vibration-damped member 2 to reduce the bending curvature of the vibration-damping steel plate 3. In FIG. 5, the swing width is enlarged and displayed for easy understanding of the displacement state. Thereby, shear deformation is performed in more modes, and vibration damping in a wide frequency range can be effectively performed.

(Fourth Embodiment) FIG. 6 is a partial sectional side view showing the structure of the fourth embodiment of the present invention.

In the fourth embodiment of the present invention, the weight 1 is loaded in the space 4 of the damping steel plate 3 in the first embodiment. Therefore, the escape hole 2a is formed so that the weight 1 does not contact the vibration-damped member 2. Others are the same as in the first embodiment. The fourth embodiment is suitable for use when the weight 1 cannot be loaded on the vibration-damping steel plate 3 due to the structural limitation of the device to be damped. The vibration damping operation and its effect are performed as in the first embodiment.

(Fifth Embodiment) FIG. 7 is a partial sectional side view showing the structure of the fifth embodiment of the present invention.

The fifth embodiment of the present invention is a vibration-damping steel plate in which dust is accumulated in a space 4 formed between the vibration-damping steel plate 3 and the vibration-damped member 2 in the first or third embodiment. A cover 5 is provided for not disturbing the displacement of 3. The cover 5 is fixed to the vibration-damped member 2 with screws 6. In the case of the fifth embodiment, not only the invasion of dust into the space 4 is prevented, but also oil and iron powder are prevented from adhering to the outer surface, and the deterioration of vibration damping function due to the adherence of foreign matter is prevented. can do.

(Sixth Embodiment) FIG. 8 is a side view showing the configuration of the sixth embodiment of the present invention.

In the sixth embodiment of the present invention, the elastic body 7 which can effectively be regarded as a space against vibration in the space 4 in the first embodiment.
Is filled. A sponge, rubber, or the like is used for the elastic body 7, and dust is prevented from entering by filling the elastic body 7. Since the elastic body 7 is a soft material, it does not affect the displacement of the vibration-damping steel plate 3 due to the vibration, and the same effect as the first embodiment can be obtained. As the elastic body 7, polymer materials other than the above, such as plastics, elastomers, plastic foaming agents, and elastomer foaming agents can be used.

(Seventh Embodiment) FIGS. 9 and 10 are perspective views showing the configuration and mounting state of a seventh embodiment of the present invention.

The seventh embodiment of the present invention shows an example applied to a brake device, in which a damping steel plate is loaded with a weight 1 using a rim 22 which generates vibration due to friction of a brake lining 21 as a damping member. 3 is fixed by screws 8 in the circumferential direction shown in FIG. 9 or in the axial direction shown in FIG. When strongly connecting the weight 1 to be loaded on the damping steel plate 3, as shown in FIG. 11, a through hole should be provided at the center of the weight 1, the bolt 9 should be inserted and the nut 10 should be used for fastening. You can If the vibration damping device according to the present invention is used in such a vehicle braking device, its effects will be remarkably exhibited.

(Eighth Embodiment) FIG. 12A is a side view showing the structure of the eighth embodiment of the present invention, and FIG.

In the eighth embodiment of the present invention, a rod 31 is erected on a damping steel plate 3 fixed by screws 8 on a rim 22 of a brake device, and a space for heat dissipation is provided at an upper end portion of the rod 31. A support body 35 is provided which is hooked with 36, and an elastic body 33 is provided so as to enclose the support body 35. Further, a weight 34 is provided so as to enclose the elastic body 33. The lower end of the rod 31 is fixed to the damping steel plate 3 by welding, and the support body 35 is fixed to the upper end of the rod 31 with bolts 32.

In the eighth embodiment, since the weight 34 fixed to the damping steel plate 3 is further mounted via the elastic body 33, the vibration from the rim 22 is applied to the damping steel plate 3 and the elastic body 33. Is also absorbed, and the damping effect can be further enhanced. The heat transferred to the rim 22 is efficiently radiated from the space 36 provided on the inner circumference of the support body 35.

(Ninth Embodiment) FIG. 13A is a side view showing the configuration of the ninth embodiment of the present invention, and FIG.

In the ninth embodiment of the present invention, the screw 8 is attached to the web 23.
A through hole is provided in the vibration damping steel plate 3 fixed by, and a bush 42 is inserted through a pin 41 inserted through the through hole, and an elastic body 44 enclosed by a ring-shaped weight 43 is provided around the bush 42. It is fixed. The pin 41 is crimped and fixed. Due to vibration, the weight 43 and the elastic body 44
A space is provided on both sides of the web 23 so as not to contact the side surface of the web 23 and the end surface of the pin 41.

In the ninth embodiment, the vibration-damping steel plate 3 is attached to the web 23, and the weight 43 is attached to the vibration-damping steel plate 3 via the elastic body 44 as in the eighth embodiment. The vibration is absorbed by the damping steel plate 3 and the elastic body 44, and the damping effect can be enhanced.

[0047]

As described above, according to the present invention, it is possible to economically attenuate the noise of the audible frequency generated from the member vibrating due to friction with a simple structure. In addition, since its structure and shape are extremely simple and small, it is mechanically robust, and when it is used as a braking device, it does not deform even if it is subjected to severe vibrations due to running of the vehicle, and it accumulates due to dust accumulation. It is possible to continuously reduce the noise of the ears, such as the squeal of a brake, with almost no deterioration in function or aging.

[Brief description of drawings]

1A is a plan view showing the configuration of a first embodiment of the present invention, and FIG. 1B is a side view thereof.

FIG. 2 is a diagram illustrating a displacement state of the vibration damping steel plate in the first embodiment of the present invention.

3A is a plan view showing a configuration of a second embodiment of the present invention, and FIG. 3B is a side view thereof.

4A is a plan view showing the configuration of a third embodiment of the present invention, and FIG. 4B is a side view thereof.

FIG. 5 is a diagram for explaining a displacement state of the vibration damping steel plate in the third embodiment of the present invention.

FIG. 6 is a partial cross-sectional side view showing the configuration of the fourth embodiment of the present invention.

FIG. 7 is a partial cross-sectional side view showing the configuration of the fifth embodiment of the present invention.

FIG. 8 is a side view showing the configuration of the sixth embodiment of the present invention.

FIG. 9 is a perspective view showing a configuration and an attached state of a seventh embodiment of the present invention.

FIG. 10 is a perspective view showing a configuration of a seventh embodiment of the present invention and another mounting state.

FIG. 11 is a side view showing a mounting example of weights according to a seventh embodiment of the present invention.

FIG. 12 (a) is a side view showing the configuration of an eighth embodiment of the present invention, and FIG. 12 (b) is an enlarged sectional view taken along line AA of FIG.

13A is a side view showing the configuration of a ninth embodiment of the present invention, and FIG. 13B is a partially enlarged cross-sectional view in the direction of arrow B of FIG.

[Explanation of symbols]

 1, 34, 43 Weight 2 Damped member 2a Escape hole 3, 13 Damping steel plate 3a, 13a Steel plate 3b, 13b Elastic material layer 4, 36 Space 5 Cover 6, 8 Screw 7, 33, 44 Elastic body 20 Brake shoe 21 Brake lining 22 Rim 23 Web 31 Rod 32 Bolt 35 Support 41 Pin 42 Bush

Claims (9)

[Claims] 1. A vibration damping device in which a weight is loaded in the vicinity of a vibration abdomen of a vibration-damped member which is a noise source, wherein a multi-layer capable of being slightly displaced in the shearing direction between the weight and the vibration-damped member. The damping plate having a structure is bent, and the damping plate is formed by bending so that a space is formed between the damping plate and the damping member at the position where the weight is attached. Vibration control device. 2. The vibration damping device according to claim 1, wherein the vibration-damped member is a member that constitutes a brake device of a vehicle. 3. The vibration damping device according to claim 1, wherein the multilayer vibration damping plate includes a layer of an elastic material in one of the layers. 4. The vibration damping device according to claim 1, wherein the weight is loaded substantially at the center of the position where the space is formed. 5. The vibration damping device according to claim 1, wherein the weight is loaded at a position deviated from the center of the position where the space is formed. 6. The vibration damping device according to claim 1, wherein the weight is housed in the space. 7. The vibration damping device according to claim 1, further comprising a cover that covers the vibration damping plate and the weight. 8. The vibration damping device according to claim 1, wherein the space is filled with an elastic body that can be effectively regarded as a space against vibration. 9. A brake device in which a weight is loaded in the vicinity of a vibration abdomen of a member that generates noise due to friction, and a multilayer structure that can be slightly displaced in the shearing direction between the weight and the member that generates the noise. And a damping device formed by bending the damping plate so that a space is formed between the damping plate and the member at the position where the weight is attached. .