JP4737411B2 - Vibration control structure - Google Patents

Description

  The present invention relates to a vibration damping structure that reduces vibration noise by a structure that transmits and generates vibration noise in an internal combustion engine, an electric motor, or the like in which vibration noise is a problem.

In an internal combustion engine, an electric motor, etc., vibration is generated with the operation thereof, and the vibration is transmitted through a surrounding structure and causes vibration noise. For this reason, conventionally, a means for reducing vibration noise by interposing a damping material in the structure has been taken. Various proposals have been made to increase the vibration reduction effect. For example, improved techniques for damping alloys with improved damping function as damping materials have been proposed (see Patent Documents 1, 2, and 3). .
When a damping alloy having a high Young's modulus and a high damping rate is applied to a structure, it may be applied in a form in which the damping alloy 11 is sandwiched between the member 10 and the member 12 as shown in FIG. Many. The parts are fastened by bolts 13, nuts 14, and the like. In some cases, vibration-damping alloys are molded into screws and washers to replace existing parts, or processed into a ring shape and fitted.
JP 2002-146498 A Japanese Patent No. 2536255 Japanese Patent No. 2867639

However, the conventional application techniques have the following problems.
(A) When the damping alloy is used while being sandwiched between members as in the prior art, if the damping alloy is thin, the damping effect is small.
(B) On the other hand, when the rigidity of the member is lower than that of the vibration damping alloy, if the vibration damping alloy is thick, the vibration damping effect is large, but the rigidity of the coupling portion is reduced.
(C) Increasing the volume of the damping alloy to be applied has a great effect, but the damping alloy is often expensive and causes a problem in profitability.

  Further, in the application of the damping alloy in the conventional method, the damping alloy 11 mainly reduces the vibration in the direction perpendicular to the joint surface between the members 10 and 12 as shown in FIG. However, as shown in FIG. 7B, the vibration that is generally generated on the joint surface is a vibration in a direction parallel to the joint surface such that the joint surfaces are relatively displaced from each other. In a structure in which the damping alloy is sandwiched between the members in such a vibration direction, it is difficult to obtain a vibration reduction effect unless the damping alloy is thickened. However, when the damping alloy is made thick, problems arise in terms of rigidity and cost as described above.

  The present invention has been made against the background of the above circumstances, and has a damping structure capable of effectively reducing vibration even in the horizontal direction at low cost and without impairing the rigidity of the structure. The basic purpose is to provide.

That is, in the vibration damping structure of the present invention, the first aspect of the invention is such that the first groove and the second groove facing each other are formed on the joint surface where the first member and the second member are joined. Damping alloys are fitted into the spaces formed by the respective members and formed by the first and second grooves so as to contact the respective grooves, A first contact piece that contacts the groove surface of the first groove, a second contact piece that contacts the groove surface of the second groove, and a connection that connects the first contact piece and the second contact piece. And the first contact piece, the second contact piece, and the connecting piece have an S-shaped cross-section and a circular outer periphery, and the first member and the second piece The bonding surfaces of the members are abutted and fastened to each other.

  According to a second aspect of the present invention, the first contact piece further contacts the second groove surface, and the second contact piece further contacts the first groove surface. It is characterized by abutting on.

The invention of the vibration damping structure according to claim 3 is the invention according to claim 1 or 2, wherein the first groove and the second groove are formed as V-shaped grooves facing each other, and both V-shaped grooves are formed. the space section quadrangle formed by, characterized in that it is fitted prior Symbol vibration damping alloy.

A fourth aspect of the invention of the vibration damping structure is characterized in that, in the third aspect of the invention, a rectangular space formed by the V-shaped groove is made smaller than an outer peripheral contour of the damping alloy .

  That is, according to the present invention, the damping alloy is fitted into the groove inner space facing each other on the contact surfaces of the first member and the second member, and the first contact piece of the damping alloy is at least The second contact piece comes into contact with at least the second groove surface of the second member, and comes into contact with the first groove surface of the first member. When vibration is transmitted to the first member or the second member in this fitted state, vibration is effectively reduced in the connecting piece or the like in the damping alloy regardless of the vibration direction. Moreover, since a 1st member and a 2nd member can be joined by a joint surface except a groove part, favorable rigidity can be obtained. Furthermore, since the damping alloy is sufficient in the amount disposed in the groove, it is possible to reduce the usage amount of the high-cost damping alloy, and it is possible to configure the damping structure at a low cost.

Further, each of the first groove and the second groove is formed with a V-shaped cross section, and a damping alloy having an S-shaped cross section is fitted into a space having a quadrangular cross section formed between the grooves. In addition, the damping alloy can be inscribed at several points, the vibration can be effectively transmitted to the damping alloy, and the vibration can be effectively damped at other parts of the damping alloy. The S-shaped cross section, the outer peripheral edge in a substantially circular shape. Thereby, the reduction effect can be obtained substantially evenly without having directionality in the vibration reduction effect.

  Further, in a state where the damping alloy is elastically deformed in the space between the grooves, for example, by making a square space formed by the V-shaped groove smaller than an outer peripheral contour of the damping alloy processed into the S-shaped cross section. If fitted, the vibration transmission to the damping alloy is reliably performed, the vibration damping effect is improved, and the rigidity is further improved. In particular, in the joining direction of the first member and the second member, it is desirable that the dimension between the grooves is smaller than the dimension of the damping alloy. Thereby, when fastening the first member and the second member, the damping alloy can be compressed and reliably brought into contact with the groove surface.

The vibration damping structure of the present invention is preferably applied to an internal combustion engine, an electric motor or the like in which vibration noise is a problem. However, the scope of application of the present invention is not limited, and various technical ranges in which vibrations are desired to be reduced. Can be widely applied to.

As described above, in the vibration damping structure of the present invention, the first groove and the second groove facing each other are formed in each member on the joint surface where the first member and the second member are joined. A damping alloy is fitted in the space formed by the first groove and the second groove so as to abut each of the grooves, and the damping alloy A first contact piece that contacts the groove surface; a second contact piece that contacts the groove surface of the second groove; and a connecting piece that connects the first contact piece and the second contact piece. The first abutting piece, the second abutting piece and the connecting piece have an S-shaped cross-sectional shape and a circular outer periphery, and each of the first member and the second member. Since the joining surfaces are brought into contact with each other and fastened, the amount of the damping alloy disposed can be reduced and the cost can be reduced.

  When the vibration is generated, the vibration to be transmitted between the first member and the second member is effectively transmitted to the damping alloy, and the vibration is effectively attenuated by the damping alloy. Reduce the generation of noise. Further, since the contact area between the members is large, there is an effect that almost no decrease in rigidity due to the damping alloy occurs.

  Further, the first groove and the second groove are formed as V-shaped grooves facing each other, and a damping alloy processed into an S-shaped cross-sectional shape is fitted into a square-shaped space formed by both V-shaped grooves. If combined, the use of the damping alloy having the S-shaped cross section makes the vibration reducing effect more remarkable, and the amount of damping alloy used can be made smaller.

  Furthermore, according to the present invention, in a structure that transmits and generates vibration noise, when the structure is formed of several parts, the damping alloy is applied to the joint surfaces by slight processing. It can also be applied and has a wide application range.

Also, space mated damping alloy between the grooves, the first contact piece, the second contact piece is constituted by a connecting piece, serve spring by having a shape of S Zidane surface, Even if the dimensions of the groove shape and the cross-sectional shape of the damping alloy change slightly, the damping alloy always comes into optimal contact with the groove surface and exhibits a vibration reduction effect.

Also, better efficiency of contact with the groove surface by the outer peripheral contour of the damping alloy of S-section shape in a substantially circular shape, also always in contact with both the members as assembled in the very direction of always optimal vibration A reduction effect can be obtained.

Below, one Embodiment of this invention is described based on FIGS.
The damping alloy 1 has a long shape with an S-shaped cross-section, the second contact piece 1b having the arcuate cross section, the first contact piece 1a, and the first contact piece 1a having the arcuate section. And the connecting piece 1c connected to each end of the second contact piece 1b, and the outer peripheral contour has a circular shape.

On the other hand, the first member 2 and the second member 3 constituting the structure for transmitting and generating vibration noise are respectively provided with the first contact piece 1a or the second contact member as shown in FIG. A first groove 4a and a second groove 4b having a V-shaped cross section capable of accommodating the piece 1b are formed at opposing positions. The first groove 4 a and the second groove 4 b constitute a space 4 having a quadrangular cross section by overlapping the first member 2 and the second member 3. The damping alloy 1 described above is fitted into the space 4. At this time, the first contact piece 1a contacts the points a and b at the target position of the groove surface of the first groove 4a, and the second contact piece 1b is the target position of the groove surface of the second groove 4b. So that they are in contact with points c and d.

Incidentally, with respect to the vertical direction in the figure of the size of the damping alloy 1, is smaller in size in the vertical direction in the figure of the space 4, the abutment point by overlaying the first member 2 and second member 3 a The distance between b and the contact points c and d is reduced, and the damping alloy 1 is compressed in the vertical direction in the figure. As a result, the damping alloy 1 continues to reliably contact the first member 2 and the second member 3 at all the points a, b, c, and d, and a damping structure having a great vibration reduction effect is obtained. It is done. The first member 2 and the second member 3 are fastened by bolts 13, nuts 14, etc. and used for the intended purpose.

In the vibration damping structure, if either one of the first member 2 and the second member 3 is a structure that transmits and generates vibration noise, vibration is transmitted to the vibration damping alloy 1 through the contact point. Communicated. The damping alloy 1 attenuates the vibration when the vibration transmitted to the first contact piece 1a or the second contact piece 1b is transmitted from the contact piece to the connecting piece 1c and further to the other contact piece. Moreover, it is possible to exhibit a good vibration reduction effect in any vibration direction including the horizontal direction with respect to the joint surface, and to reduce vibration noise transmitted to the other member.
Further, the first member 2 and the second member 3 are brought into contact with each other over a wide area by the above fastening, and the elastic force of the damping alloy 1 acts on the whole at the arrangement position of the damping alloy 1. As a result, good rigidity can be obtained.

  In the above-described embodiment, in the damping alloy 1 having an S-shaped cross section, the first contact piece 1a is brought into contact with the first groove 4a at two points a and b at the symmetrical position, and the second contact piece 1b. However, the arrangement position is not limited to the above-described embodiment, and the first contact piece 1a is connected to the first groove 4b in a symmetrical position. 4a and the groove surface of the second groove 4b are brought into contact with each other, and the second contact piece 1b is brought into contact with both the groove surface of the second groove 4b and the groove surface of the first groove 4a. You may make it make it. The arrangement position can be set in consideration of, for example, the direction of vibration transmitted through the member.

  FIG. 5 shows a modification example of the arrangement direction of the damping alloy 1. In FIG. 5 (a), the damping alloy 1 is arranged so that the S-shaped cross section is in the horizontal direction in the figure. This arrangement also has an effect of reducing vibrations in any direction, and is particularly effective in reducing vibrations in the vertical direction. Further, in FIG. 5B, the damping alloy 1 is arranged so that the S-shaped cross section is inclined 45 degrees in the drawing. Even at this position, there is a vibration reduction effect in any direction, and a particularly good effect is exhibited in reducing vibration in an oblique direction.

  In addition, as described above, a good vibration reduction effect can be obtained regardless of the arrangement direction of the damping alloy, so that equivalent performance can be obtained even when there are variations in the arrangement direction during the arrangement work. There is an effect that the burden is small.

  As mentioned above, although this invention was demonstrated based on the said embodiment, this invention is not limited to the content of the said description, A change is possible in the range which does not deviate from the scope of the present invention.

It is the side view, front view, and perspective view which show the damping alloy used for one Embodiment of this invention. Similarly, it is an assembly perspective view for constituting the damping structure of one embodiment. Similarly, it is an assembly front view for constituting the damping structure of one embodiment. Similarly, it is a front view which shows the damping structure of one Embodiment. It is a front view which shows other embodiment of this invention. It is a front view which shows the conventional damping structure. It is a front view which shows the vibration transmission example in the conventional damping structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Damping alloy 1a 1st contact piece 1b 2nd contact piece 1c Connection piece 2 1st member 3 2nd member 4 Space 4a 1st groove | channel 4b 2nd groove | channel

Claims (4)

A first groove and a second groove that are opposed to each other are formed in each member on a joint surface where the first member and the second member are joined, and the first groove and the second groove Damping alloys are fitted into the formed spaces so as to be in contact with the respective grooves, and the damping alloys include the first contact piece that contacts the groove surface of the first groove and the second A first abutting piece, a second abutting piece, a second abutting piece that abuts against the groove surface of the groove, and a connecting piece that connects the first abutting piece and the second abutting piece. And the connecting piece has an S-shaped cross-sectional shape and a circular outer peripheral contour, and the joint surfaces of the first member and the second member are in contact with each other and fastened. Vibration suppression structure.   2. The vibration damping structure according to claim 1, wherein the first contact piece further contacts the second groove surface, and the second contact piece further contacts the first groove surface. Wherein the first groove and the second groove is formed in the V-shaped grooves facing each other, the space rectangular cross section formed by both V-shaped grooves, that pre SL Damping alloy is fitted The vibration damping structure according to claim 1 or 2, characterized in that: 4. The vibration damping structure according to claim 3 , wherein a rectangular space formed by the V-shaped groove is smaller than an outer peripheral contour of the vibration damping alloy .

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