JP2013119886A - Vibration isolating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration isolating device capable of preventing a mass body from dropping off and preventing a resonance frequency from varying.SOLUTION: The vibration isolating device 10 includes a bracket 12 mounted on a vibration isolation object, a mass member 16 in which the mass body 20 and a through shaft 22 projecting from the mass body 20 are integrally formed, an elastic member 14 in which a through-hole 24 formed in the bracket 12 is penetrated by the through shaft 22 without contact to connect the mass member 16 to the bracket 12, and an enlarged diameter section 23A in which an end of the through shaft 22 penetrating the through-hole 24 is processed, and projected in a radial direction to prevent dropping off of the through-hole 24.

Description

  The present invention relates to a vibration isolator.

  For example, a dynamic damper as a vibration isolator having a resonance frequency corresponding to these natural frequencies is used for members and body panels constituting a vehicle body such as an automobile. This type of dynamic damper includes a bracket (attachment member) attached to the vibration-proof object, a mass body, and an elastic member that connects the bracket and the mass member.

  In such a dynamic damper, a rod-shaped member that prevents the mass body from falling off is provided, and one end of the rod-shaped member is a stopper that penetrates a through hole formed in the mounting member, and the other end of the rod-shaped member is an elastic member. There is a dynamic damper that is press-fitted into an insertion hole of a mass body covered with (Patent Document 1).

  However, since the rod-shaped member is press-fitted into the insertion hole via the elastic member, the resonance frequency of the dynamic damper may vary due to the vibration of the rod-shaped member. Moreover, since the weight of the rod-shaped member and the weight of the elastic member covering the mass body affect the resonance frequency of the dynamic damper, it is difficult to obtain a desired resonance frequency.

JP 2001-193789 A

  The present invention has been made in consideration of the above-mentioned matters, and an object thereof is to prevent the mass body from falling off and to suppress variations in resonance frequency.

  The vibration isolator according to claim 1 is formed on the attachment member, the attachment member attached to the object to be anti-vibrated, the mass member in which the mass body and the protruding portion protruding from the mass body are integrated. The projecting part is passed through the through-hole without contacting it, and an elastic member for connecting the mass member and the mounting member, and the projecting part projecting radially from the end of the projecting part penetrating the through-hole An anti-extraction part that prevents the anti-extraction from.

  In the vibration isolator according to claim 1, a through hole is formed in the attachment member, and the protruding portion of the mass member is passed through the through hole, and an extraction preventing portion protruding in the radial direction is provided at the end of the protruding portion. Is formed. Thereby, even if an elastic member fractures | ruptures, it can prevent that a mass member falls from an attachment member.

  In addition, since the mass member is formed integrally with the mass body and the protrusion for preventing withdrawal, a desired resonance frequency can be easily obtained simply by adjusting the weight of the mass member.

  According to a second aspect of the present invention, in the vibration isolator, the extraction preventing portion is a diameter-expanded portion obtained by expanding the diameter of a cylindrical portion formed at an end portion of the protruding portion.

  In the vibration isolator according to claim 2, a cylindrical portion is formed at the end of the protruding portion, and a diameter-expanded portion that is larger in diameter than the through-hole formed in the attachment member is used as an extraction preventing portion. Yes. Thereby, even if an elastic member fractures | ruptures, an enlarged diameter part is latched by an attachment member and it prevents that a mass member falls from an attachment member.

  According to a third aspect of the present invention, the anti-vibration device is processed by dividing the end portion of the protruding portion and bending it outward in the radial direction.

  In the vibration isolator according to the third aspect, the end of the protruding portion bent outward in the radial direction is locked to the mounting member, and the mass member is prevented from falling off the mounting member.

  The vibration isolator according to claim 4, wherein the anti-extraction portion is formed by bending a plurality of tongue pieces extending in the axial direction of the protruding portion radially outward at an end portion of the protruding portion. Yes.

  In the vibration isolator according to the fourth aspect, the plurality of tongue pieces bent outward in the radial direction are locked to the mounting member to prevent the mass member from falling off the mounting member.

  According to a fifth aspect of the present invention, in the vibration isolator, the extraction preventing portion is a large-diameter portion processed by crushing an end portion of the protruding portion.

  In the vibration isolator according to the fifth aspect, the large-diameter portion processed by crushing the end portion of the protruding portion is locked to the mounting member, and the mass member is prevented from falling off the mounting member.

  Since the present invention is configured as described above, it is possible to prevent the mass member from falling off the mounting member with a simple structure.

It is a perspective view of the vibration isolator which concerns on 1st Embodiment. It is an AA cross-sectional perspective view of FIG. (A) is sectional drawing which shows the state before expanding the diameter of the edge part of the penetration shaft of the vibration isolator which concerns on 1st Embodiment, (B) is sectional drawing which shows the state by which the edge part of the penetration axis was expanded. It is. It is a cross-sectional perspective view of the vibration isolator which concerns on 2nd Embodiment. (A) is a principal part enlarged view which shows the state before bending the edge part of the penetration shaft of the vibration isolator which concerns on 3rd Embodiment, (B) shows the state by which the edge part of the penetration shaft was bent. It is a principal part enlarged view. (A) is a principal part expansion perspective view which shows the tongue piece formed in the edge part of the penetration shaft of the vibration isolator which concerns on 4th Embodiment, (B) is a principal part expansion perspective view which shows the state which bent the tongue piece. FIG. 4C is a cross-sectional view taken along the line CC of FIG. (A) The principal part enlarged view which shows the state before crushing the edge part of the penetration shaft of the vibration isolator which concerns on 5th Embodiment, (B) shows the state by which the edge part of the penetration shaft was crushed. It is a principal part enlarged view.

  The vibration isolator according to the first embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, a vibration isolator 10 according to the present embodiment includes a bracket 12 as an attachment member attached to a body panel 17 of a vehicle, an elastic member 14 vulcanized and bonded to the bracket 12, and an elastic member. 14 and a mass member 16 connected to 14.

  The bracket 12 is a substantially L-shaped rigid plate having a first surface 12A and a second surface 12B orthogonal to each other, and a bolt hole 18 is formed slightly below the center of the first surface 12A. Bolts 19 are inserted into the bolt holes 18 and attached to the body panel 17 of the vehicle.

  As shown in FIG. 2, a through hole 24 penetrating in the plate thickness direction is formed in the central portion of the second surface 12B of the bracket 12, and a through shaft 22 of the mass member 16 described later passes therethrough.

  A mass member 16 is disposed above the second surface 12B of the bracket 12. The mass member 16 includes a columnar mass portion 20 and a through shaft 22 as a projecting portion that projects downward from the center portion of the mass portion 20. The mass portion 20 is formed of a material having a high specific gravity such as iron or copper, and is integrally formed with the through shaft 22 by forging or casting.

  The through-shaft 22 is a vertically long cylinder having a smaller diameter than the mass portion 20, and a thin cylindrical portion 23 that passes through the through-hole 24 of the bracket 12 is continuously formed in the lower portion of the through-shaft 22. Further, the through shaft 22 and the cylindrical portion 23 pass through without contacting the through hole 24, and a gap is provided between the through shaft 22 and the through hole 24.

  Further, the lower end of the cylindrical portion 23 is opened, and the diameter is increased outward in the radial direction to form an enlarged diameter portion 23 </ b> A having a larger diameter than the through hole 24.

  An elastic member 14 is provided between the mass member 16 and the second surface 12B of the bracket 12. The elastic member 14 includes a lower wall of the mass portion 20, an upper portion of the outer peripheral wall of the through shaft 22, and the bracket 12. The second surface 12B is vulcanized and bonded to each other. The elastic member 14 is formed of a rubber material such as natural rubber, or an elastic material such as an elastomer.

  An annular groove 26 is formed along the through hole 24 on the lower surface of the elastic member 14. The depth of the groove portion 26 is about half of the height of the elastic member 14, and a thin covering portion 14 </ b> A covering the through shaft 22 is formed on the radially inner side of the groove portion 26. The covering portion 14 </ b> A is integrally formed with the elastic member 14.

  Next, a method for forming the enlarged diameter portion 23A will be described.

  As shown in FIG. 3A, the cylindrical portion 23 of the mass member 16 is passed through the through hole 24, and the elastic member 14 is vulcanized and bonded. In this state, the lower end portion of the cylindrical portion 22A formed at the lower portion of the through shaft 22 is not expanded in diameter.

  Next, the diameter expansion jig 100 is inserted from the opening 23 </ b> B at the lower end of the cylindrical portion 23. The diameter expansion jig 100 includes a shaft 102, a substantially truncated cone-shaped bit 104 which is provided at the tip of the shaft 102 and has a small diameter on the tip side, and a stopper 106 formed at the tip of the bit 104.

  As shown in FIG. 3B, when the diameter expansion jig 100 inserted into the cylindrical portion 23 is pushed up in the direction of the arrow, the lower end portion of the cylindrical portion 23 is pushed and bent by the peripheral wall of the bit 104 to be expanded in diameter. . And the diameter expansion part 23A is formed by pushing up the diameter expansion jig 100 until the stopper 106 is locked to the upper end of the cylinder part 22A.

  In the present embodiment, the diameter-enlarged portion 23A is formed using the diameter-enlarging jig 100, but the diameter may be increased by other methods. For example, the diameter of the cylindrical portion 23 may be increased by bending the end of the cylindrical portion 23 using a tool such as pliers. Moreover, if the diameter-enlarged portion 23A having a larger diameter than the through hole 24 can be formed, the axial length of the cylindrical portion 23 is not particularly limited. For example, the cylinder part 23 may be formed up to the vicinity of the mass body 20.

  Next, the operation of the vibration isolator 10 according to the present embodiment will be described.

  The vibration isolator 10 shown in FIG. 2 is attached to the body panel 17 of the vehicle body. At this time, the natural frequency when the body panel vibrates due to vibration generated from the engine is measured in advance, and the vibration isolator 10 corresponding to the natural frequency is attached to the body panel.

  When the engine is started in this state, the elastic member 14 of the vibration isolator 10 is elastically deformed in the vertical direction by vibration generated from the engine, and the vibration of the body panel 17 to which the vibration isolator 10 is attached is attenuated.

  Here, since the groove portion 26 is formed in the elastic member 14, the elastic deformation in the vertical direction can be smoothly performed. Further, since the elastic member 14 is vulcanized and bonded from the middle portion to the upper portion of the outer peripheral wall of the through shaft 22, the mass member 16 is reliably held by the elastic member 14. Thereby, it is possible to suppress the mass member 16 from being greatly displaced in the horizontal direction.

  And even if the elastic member 14 breaks while using the vibration isolator 10, since the enlarged diameter portion 23A is locked to the bracket 12, it is possible to prevent the mass member 16 from falling off the bracket 12.

  Moreover, since welding etc. are not performed in a manufacture process, the vibration isolator 10 can be manufactured, without the elastic member 14 deteriorating with a heat | fever. Furthermore, since the vibration isolator 10 is a single mass dynamic damper, the resonance frequency can be set easily.

  In addition, although the mass part 20 which concerns on this embodiment was a column shape, if it is a structure provided with a fixed resonant frequency, the shape of the mass part 20 will not be restrict | limited in particular. For example, it may be a rectangular parallelepiped or a cone. Moreover, although the shape of the bracket 12 according to the present embodiment is substantially L-shaped, it is needless to say that the shape can be appropriately changed according to the shape to which the vibration isolator 10 is attached.

  Next, the vibration isolator according to the second embodiment will be described.

  As shown in FIG. 4, the mass member 58 constituting the vibration isolator 50 according to the present embodiment is constituted by a column 52 and a pipe 56. The column 52 is formed of a material having a high specific gravity such as iron or copper, and a press-fit hole 54 penetrating in the thickness direction of the column 52 is formed at the center of the column 52.

  A pipe 56 is press-fitted into the press-fitting hole 54 and is integrated with the cylinder 52. The pipe 56 is a general-purpose pipe made of stainless steel or aluminum, cut into an appropriate length, and press-fitted into the cylinder 52.

  The lower end portion of the pipe 56 is a diameter-enlarged portion 56 </ b> A that is diameter-enlarged after passing through the through-hole 24 formed in the central portion of the bracket 12. Here, since the enlarged diameter portion 56 </ b> A is formed with a larger diameter than the through hole 24, the enlarged diameter portion 56 </ b> A is locked to the bracket 12 even when the elastic member 14 is broken. Thereby, it is possible to prevent the mass member 58 from falling off.

  In addition, since the mass member 58 according to the present embodiment is formed by press-fitting the pipe 56 into the column 52, for example, the mass member 58 is manufactured even in a factory that does not have facilities for forging and casting. Can do. Furthermore, since a general-purpose pipe is used as the pipe 56, the material cost can be reduced.

  Next, the vibration isolator according to the third embodiment will be described. In addition, the thing of the same structure as 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits suitably and demonstrates.

  As shown in FIG. 5A, the through shaft 60 according to the present embodiment has a cylindrical shape, and the lower portion of the through shaft 60 penetrates the through hole 24 of the bracket 12. Further, a slit 62 formed in the axial direction of the through shaft 60 is formed at the lower end portion of the through shaft 60, and the lower end portion of the through shaft 60 is divided into two equal parts. The other structure is the same as that of the vibration isolator 10 shown in FIG.

  As shown in FIG. 5B, the leg portions 60A are formed by bending the lower end portions of the divided through shafts 60 outward in the radial direction in opposite directions. Here, since the maximum horizontal width of the leg portion 60A is wider than the through hole 24 formed in the bracket 12, the leg portion 60A is locked to the bracket 12.

  In addition, although the lower end part of the through-shaft 60 which concerns on this actual embodiment was divided into 2 equally by the slit 62, you may form the slit 62 further and may increase a division | segmentation number. For example, a slit 62 may be further formed in a direction orthogonal to the slit 62 and the end portion of the through shaft 60 may be divided into four equal parts.

  By increasing the number of divisions that divide the lower end portion of the through shaft 60, the cross-sectional area of one leg constituting the leg portion 60A is reduced, so that it can be bent with a smaller force.

  Further, if the opening leg portion 60A can be made wider than the through hole, the length of the slit 62 in the axial direction is not particularly limited.

  Next, a vibration isolator according to the fourth embodiment will be described. In addition, the thing of the same structure as 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits suitably and demonstrates.

  As shown in FIG. 6A, the lower portion of the through shaft 70 according to the present embodiment is cylindrical, and three tongue pieces 70A extending in the axial direction from the through shaft 70 are provided at the lower end portion of the through shaft 70. Is provided. The three tongue pieces 70A are formed at equal intervals in the circumferential direction of the through shaft 70, and are integrally formed with the through shaft 70 by casting or the like. Other configurations are the same as those of the vibration isolator 10 shown in FIG.

  After penetrating the through-shaft 70 through the through-hole 24 of the bracket 12, as shown in FIG. 6B, the through-shaft 70 is pulled out from the bracket 12 by bending the tongue piece 70A radially outward. To prevent.

  A groove 72 is formed in the circumferential direction of the through shaft 70 at the upper end of the inner peripheral wall of the tongue piece 70A, as shown in FIG. By forming the groove 72, the tongue piece 70A can be easily bent. Further, by forming the tongue piece 70A thinner than the through-shaft 70, or by forming the tongue piece 70A in a tapered shape so as to become thinner toward the tip, the tongue piece 70A can be more easily bent. .

  In the present embodiment, three tongue pieces 70A are formed at equal intervals in the circumferential direction of the through shaft 70, but the number of the tongue pieces 70A is not particularly limited. For example, three tongue pieces 70A may be further formed, and a total of six tongue pieces 70A may be bent radially outward. Here, the width and length of each tongue piece 70 </ b> A are not particularly limited as long as they can sufficiently lock the extraction of the through shaft 70 from the bracket 12.

  Furthermore, in the present embodiment, the lower portion of the through shaft 70 is formed in a cylindrical shape, but may be a solid column. Further, as described in the second embodiment, the through shaft 70 may be a general-purpose pipe.

  Further, when the lower portion of the through shaft 70 is formed in a cylindrical shape, the lower end portion of the through shaft 70 may be enlarged after the through shaft 70 is passed through the through hole 24. As means for expanding the diameter, the diameter expanding jig 100 of FIG. 3 described in the first embodiment can be used.

  Next, the vibration isolator of 5th Embodiment is demonstrated. In addition, the thing of the same structure as 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits suitably and demonstrates.

  As shown in FIG. 7A, the through shaft 80 according to the present embodiment is a vertically long cylinder formed of a relatively soft metal such as aluminum. The lower end portion of the through shaft 80 passes through the through hole 24 of the bracket 12, and the upper portion of the through shaft 80 is vulcanized and bonded to the elastic member 14.

  Here, the hammer 82 is struck in the direction of the arrow toward the lower end portion of the through-shaft 80 to crush the lower end portion of the through-shaft 80, and as shown in FIG. 80A is formed. Thereby, even if the elastic member 14 is ruptured, the crushing portion 80A is locked to the bracket 12 to prevent extraction.

  In addition, although the penetration shaft 80 according to the present embodiment is a vertically long cylinder, the shape is not particularly limited as long as the crushing portion 80A can be formed. For example, in order to make it easy to be crushed, it may become a small diameter toward a lower end part.

  Moreover, although the general purpose hammer was used for the hammer 82, the lower end part of the penetration shaft 80 may be crushed by other means as long as the crushing part 80A can be formed. For example, a pneumatic riveting hammer may be used. Further, depending on the means for forming the crushing portion 80A, the through shaft 80 is not limited to a relatively soft metal such as aluminum, and other materials can be used.

  The first to fifth embodiments of the present invention have been described above, but the present invention is not limited to such embodiments, and the first to fifth embodiments may be used in combination. Of course, various embodiments can be implemented without departing from the scope of the invention. For example, a structure in which a plurality of through holes are formed in the bracket and a plurality of through shafts protrude from the mass body may be employed.

10 Vibration isolator 12 Bracket (Mounting member)
14 Elastic member 16 Mass member 20 Mass body 22 Penetration shaft (protrusion part of 1st Embodiment)
23 cylinder part 23A diameter-expanded part (extraction prevention part of 1st Embodiment)
24 Through-hole 50 Vibration isolator 52 Cylinder (mass body of 2nd Embodiment)
56 Pipe (protruding part of the second embodiment)
56A Diameter-enlarged part (extraction prevention part of the second embodiment)
58 Mass member 60 Penetrating shaft (protruding portion of the third embodiment)
60A Open leg (extraction prevention part of the third embodiment)
70 Through shaft (protruding part of the fourth embodiment)
70A tongue piece (extraction prevention part of 4th Embodiment)
80 Through shaft (protruding part of the fifth embodiment)
80A crushing part (extraction prevention part of 5th Embodiment)

Claims (5)

A mounting member to be attached to the object of vibration isolation;
A mass member in which a mass body and a protruding portion projecting from the mass body are integrated;
An elastic member that penetrates the projecting portion without contacting the through hole formed in the attachment member, and connects the mass member and the attachment member;
An end portion of the projecting portion that has penetrated the through hole is processed, and an extraction preventing portion that protrudes in the radial direction to prevent extraction from the through hole, and
A vibration isolator.   2. The push vibration isolator according to claim 1, wherein the extraction preventing portion is a diameter-enlarged portion obtained by enlarging a cylindrical portion formed at an end portion of the protruding portion.   The anti-vibration device according to claim 1, wherein the extraction preventing portion is processed by dividing an end portion of the protruding portion and bending it outward in a radial direction.   The anti-vibration device according to claim 1, wherein the extraction preventing portion is formed by bending a plurality of tongue pieces extending in an axial direction of the protruding portion radially outward at an end portion of the protruding portion.   The vibration isolator according to claim 1, wherein the extraction preventing portion is a large-diameter portion processed by crushing an end portion of the protruding portion.

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