JP2008202665A - Dynamic damper and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dynamic damper and a manufacturing method thereof, capable of reducing temperature dependency and amplitude dependency. <P>SOLUTION: A direction perpendicular to both central axes of two core members 14, 15 is defined as a first direction. Rubber elastic members 18, 19 elastically connect inner peripheral surfaces of through holes 11a, 11b and outer peripheral surfaces of the core members 14, 15 while being inclined in the circumferential directions of the core members 14, 15 with respect to the first direction. Further, bridging members 22, 23 connect the core members 14, 15 and previously apply load to the rubber elastic members so that a distance between the two core members 14, 15 becomes smaller than when the elastic rubber members 18, 19 are in no load. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a dynamic damper and a manufacturing method thereof.

  Examples of conventional dynamic dampers include those described in Japanese Patent Application Laid-Open No. 2004-347052 (Patent Document 1) and Japanese Utility Model Laid-Open No. 6-80043 (Patent Document 2). The dynamic damper described in Patent Documents 1 and 2 includes a mass member, a fixing member, and a rubber elastic body.

  In the dynamic damper described in Patent Document 1 and the dynamic damper described in the prior art of Patent Document 2, the mass member has a cylindrical shape, the fixing member has an axial shape inserted through the mass member, and the rubber elastic body has The inner peripheral surface of the mass member and the outer peripheral surface of the fixing member are elastically connected.

On the other hand, a dynamic damper for making it difficult for vibration other than the vibration in the intended direction to occur is described as the invention of Patent Document 2. The mass member of the dynamic damper is formed with two through holes whose central axes are parallel to each other. The fixing member has a columnar shape or a cylindrical shape, and the two core members inserted into the respective through holes so that the central axes thereof are parallel to each other, and the two core members are connected so as to be bridged and vibration-proof A bridging member fixed to the target member is provided. The rubber elastic body elastically connects the inner peripheral surface of each through hole and the outer peripheral surface of each core member.
JP 2004-347052 A Japanese Utility Model Publication No. 6-80043

  Here, the resonance frequency of this type of dynamic damper is determined by the mass member and the spring constant of the rubber elastic body. However, the spring constant of the rubber elastic body changes with temperature. For example, the spring constant decreases with increasing temperature. Along with this, the resonance frequency of the dynamic damper is also lowered. As described above, since the temperature dependency is large, depending on the environmental temperature, it may be in a state in which the vibration-proofing effect cannot be exhibited appropriately. Therefore, it is desired to reduce the temperature dependence.

  Further, the resonance frequency of the dynamic damper also changes depending on the amplitude. For example, the resonance frequency increases when the amplitude is small and decreases when the amplitude is large. Thus, since it also has an amplitude dependency, it is also desired to reduce the amplitude dependency.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a dynamic damper capable of reducing temperature dependency and amplitude dependency and a method for manufacturing the same.

  The dynamic damper according to the first aspect of the present invention is inserted into the through hole so that the central axis is parallel to each other, and the mass member in which two through holes whose central axes are parallel to each other are formed. Two core members, a fixed member including the two core members connected to be bridged and fixed to the vibration isolation target member, an inner peripheral surface of each through hole, and each core member And a rubber elastic body that elastically connects the outer peripheral surface of the rubber.

  First, a direction perpendicular to both central axes of the two core members is defined as a first direction. And the rubber elastic body which comprises the dynamic damper of 1st invention is elastically connected in the direction which inclines in the circumferential direction of a core member with respect to a 1st direction among the internal peripheral surface of a through-hole, and the outer peripheral surface of a core member. In addition, the bridging member connects each core member so that the distance between the two core members is short relative to the position of each core member when the rubber elastic body is in an unloaded state. Burdening.

  Here, the unloaded state of the rubber elastic body is a state of the rubber elastic body before the bridging member is connected to the core member. More specifically, the unloaded state of the rubber elastic body corresponds to a case where the rubber elastic body is in a vulcanized shape when the rubber elastic body is vulcanized and formed in the through hole and the core member. To do.

  And the rubber elastic body is elastically connected in the direction inclined in the circumferential direction of the core member with respect to the first direction among the inner peripheral surface of the through hole and the outer peripheral surface of the core member. That is, the rubber elastic body is not elastically connected so as to extend in the first direction among the inner peripheral surface of the through hole and the outer peripheral surface of the core member.

  Further, the rubber elastic body is positioned in a state where a load is applied in advance. Specifically, a load is applied to the rubber elastic body in advance so that the distance between the two core members becomes shorter than the position of each core member when the rubber elastic body is unloaded.

  The load applied to the rubber elastic body will be described in more detail. Here, of the inner peripheral surface of one through hole, the other through hole side is closer to the near side than the central axis of one core member through which the rubber elastic body is inserted into the one through hole in an unloaded state. The inner peripheral surface is defined, and the surface opposite to the other through hole is defined as the far-side inner peripheral surface.

  And when the rubber elastic body in an unloaded state elastically connects the near side inner peripheral surface of the through hole and the outer peripheral surface of the core member, the following is obtained. In this case, when the distance between the two core members is reduced, the rubber elastic body undergoes compression deformation and shear deformation. And if the movement amount of a core member becomes large, shear deformation and buckling deformation will arise. Here, when compressive deformation and shear deformation occur, the force generated in the rubber elastic body increases as the movement amount of the core member increases. On the other hand, when shear deformation and buckling deformation occur, even if the movement amount of the core member increases, the force generated in the rubber elastic body has a substantially constant relationship. Then, the core member is positioned in advance in a region where the force generated in the rubber elastic body is substantially constant with respect to the movement amount of the core member.

  That is, when the moving amount of the core member with respect to the mass member is within a predetermined range as the mass member vibrates with respect to the fixed member, the force generated in the rubber elastic body can be made constant. Thereby, the dynamic damper of the first invention can have frequency characteristics having a region in which the maximum gain is substantially constant in a predetermined frequency band. In other words, the resonance frequency of the dynamic damper has a predetermined frequency band. Therefore, even if the resonance frequency of the dynamic damper changes due to a change in temperature or amplitude, the resonance frequency has a predetermined frequency band, and thus an appropriate vibration isolation effect can be exhibited. That is, according to the dynamic damper of the first invention in this case, temperature dependency and amplitude dependency can be reduced.

  Moreover, when the rubber elastic body in an unloaded state elastically connects the far-side inner peripheral surface of the through hole and the outer peripheral surface of the core member, the following occurs. In this case, when the two core members move so that the distance between them becomes shorter, the rubber elastic body undergoes tensile deformation. When the movement amount of the core member is small, the tensile force generated in the rubber elastic body increases as the movement amount of the core member increases. Further, when the movement amount of the core member increases, even if the movement amount of the core member increases, the tensile force generated in the rubber elastic body has a substantially constant relationship. Then, the core member is previously positioned in a region where the tensile force generated in the rubber elastic body is substantially constant with respect to the movement amount of the core member.

  That is, also in this case, as the mass member vibrates with respect to the fixed member, the tensile force generated in the rubber elastic body is made constant if the movement amount of the core member with respect to the mass member is within a predetermined range. Can do. Thereby, the dynamic damper of the first invention in this case can have frequency characteristics having a region where the maximum gain is substantially constant in a predetermined frequency band. In other words, the resonance frequency of the dynamic damper has a predetermined frequency band. Therefore, even if the resonance frequency of the dynamic damper changes due to a change in temperature or amplitude, the resonance frequency has a predetermined frequency band, and thus an appropriate vibration isolation effect can be exhibited. That is, according to the dynamic damper of the first invention in this case, temperature dependency and amplitude dependency can be reduced.

  The dynamic damper according to the second aspect of the invention is inserted into each through hole so that the central member is formed in a columnar shape or a cylindrical shape and the central axis is parallel to the mass member in which two through holes whose central axes are parallel to each other are formed. Two core members, a fixed member including the two core members connected to be bridged and fixed to the vibration isolation target member, an inner peripheral surface of each through hole, and each of the through holes A rubber elastic body that elastically connects the outer peripheral surface of the core member.

  Here, first, among the inner peripheral surfaces of one through hole, the rubber elastic body is opposite to the other through hole than the central axis of one core member inserted through the one through hole in an unloaded state. The side surface is defined as the far side inner peripheral surface. And the rubber elastic body which comprises the dynamic damper of 2nd invention elastically connects a far side inner peripheral surface and the outer peripheral surface of a core member. In addition, the bridging member connects each core member so that the distance between the two core members is short relative to the position of each core member when the rubber elastic body is in an unloaded state. Burdening.

  The dynamic damper of the second invention is intended for the case where the rubber elastic body is elastically connected to the far side inner peripheral surface of the through hole and the outer peripheral surface of the core member. That is, the rubber elastic body includes a case where the rubber elastic body is elastically connected so as to extend in the first direction described above, among the inner peripheral surface on the far side of the through hole and the outer peripheral surface of the core member.

  The rubber elastic body is positioned in a state where a load is applied in advance. Specifically, a load is applied to the rubber elastic body in advance so that the distance between the two core members becomes shorter than the position of each core member when the rubber elastic body is unloaded.

  Thus, when the rubber elastic body in an unloaded state elastically connects the far side inner peripheral surface of the through hole and the outer peripheral surface of the core member, the following is obtained. In this case, when the two core members move so that the distance between them becomes shorter, the rubber elastic body undergoes tensile deformation. When the movement amount of the core member is small, the tensile force generated in the rubber elastic body increases as the movement amount of the core member increases. Further, when the movement amount of the core member increases, even if the movement amount of the core member increases, the tensile force generated in the rubber elastic body has a substantially constant relationship. Then, the core member is previously positioned in a region where the tensile force generated in the rubber elastic body is substantially constant with respect to the movement amount of the core member.

  That is, also in this case, as the mass member vibrates with respect to the fixed member, the tensile force generated in the rubber elastic body is made constant if the movement amount of the core member with respect to the mass member is within a predetermined range. Can do. As a result, the dynamic damper of the second invention can have frequency characteristics having a region where the maximum gain is substantially constant in a predetermined frequency band. In other words, the resonance frequency of the dynamic damper has a predetermined frequency band. Therefore, even if the resonance frequency of the dynamic damper changes due to a change in temperature or amplitude, the resonance frequency has a predetermined frequency band, and thus an appropriate vibration isolation effect can be exhibited. That is, according to the dynamic damper of the second invention, temperature dependency and amplitude dependency can be reduced.

  In the dynamic damper of the first invention and the second invention, the following may be used. That is, the rubber elastic body may elastically connect the inner peripheral surface of one through hole and the outer peripheral surface of one core member inserted through the one through hole at two or more locations. Thereby, the load which each rubber elastic body receives can be reduced. Therefore, durability and lifetime can be improved.

  Further, the rubber elastic body may be formed symmetrically with respect to a first plane passing through both central axes of the two core members. Thereby, the core member can be positioned with high accuracy. Therefore, the dynamic damper can reliably obtain the above-described frequency characteristics.

  Further, the rubber elastic body is formed to be plane-symmetric with respect to a second plane that is perpendicular to the first plane passing through both central axes of the two core members and passes through the intermediate position of the central axis of the through hole. It may be. Here, the positioning of the core member is such that one rubber elastic body elastically connected to one through hole and the other rubber elastic body elastically connected to the other through hole balance each other. That is, the core member can be positioned with high accuracy by forming the respective rubber elastic bodies symmetrically with respect to the second plane. Therefore, the dynamic damper can reliably obtain the above-described frequency characteristics.

  In the above description, the case where the present invention is grasped as a dynamic damper has been described. In addition, the present invention can be grasped as a method for manufacturing a dynamic damper.

  That is, the manufacturing method of the dynamic damper of the first invention includes a mass member in which two through-holes whose central axes are parallel to each other and a columnar or cylindrical shape and each through-hole so that the central axes are parallel to each other. Two core members inserted through the holes, a fixing member that connects the two core members so as to be bridged, and is fixed to the vibration isolation target member, and inner peripheral surfaces of the respective through holes And a rubber elastic body that elastically connects the outer peripheral surfaces of the respective core members, and is performed as follows.

  Here, a direction perpendicular to both central axes of the two core members is defined as a first direction. And the manufacturing method of the dynamic damper of the first invention vulcanizes the rubber elastic body in a direction inclined in the circumferential direction of the core member with respect to the first direction among the inner peripheral surface of the through hole and the outer peripheral surface of the core member. After the rubber vulcanization step to be bonded and the rubber vulcanization step, each of the bridging members is set so that the distance between the two core members is short with respect to the position of each core member when the rubber elastic body is in an unloaded state. And a bridging member connecting step of applying a load to the rubber elastic body in advance.

  Thereby, the dynamic damper of the 1st invention mentioned above can be manufactured, and the effect by the dynamic damper of the 1st invention mentioned above can be produced.

  In addition, the dynamic damper manufacturing method according to the second aspect of the present invention includes a mass member having two through-holes whose central axes are parallel to each other, and a columnar or cylindrical shape that has a central axis parallel to each other. Two core members inserted through the holes, a fixing member that connects the two core members so as to be bridged, and is fixed to the vibration isolation target member, and inner peripheral surfaces of the respective through holes And a rubber elastic body that elastically connects the outer peripheral surfaces of the respective core members, and is performed as follows.

  Here, of the inner peripheral surface of one through hole, the rubber elastic body is on the opposite side of the other through hole from the central axis of one core member inserted into the one through hole in the unloaded state. The surface is defined as the far-side inner peripheral surface. The dynamic damper manufacturing method according to the second aspect of the present invention includes a rubber vulcanization step in which a rubber elastic body is vulcanized and bonded to the far side inner peripheral surface and the outer peripheral surface of the core member, and after the rubber vulcanization step, the rubber elasticity The bridge member is connected to each core member so as to shorten the distance between the two core members relative to the position of each core member when the body is in an unloaded state. A member connecting step.

  Thereby, the dynamic damper of the 2nd invention mentioned above can be manufactured, and the effect by the dynamic damper of the 2nd invention mentioned above can be produced.

  According to the dynamic damper of the present invention, the resonance frequency of the dynamic damper can have a predetermined frequency band. Therefore, the temperature dependency and amplitude dependency of the dynamic damper can be reduced.

  Next, the present invention will be described in more detail with reference to embodiments.

<First embodiment>
(Configuration of dynamic damper)
The dynamic damper 1 of the first embodiment will be described with reference to FIGS. FIG. 1 is a front view showing a completed state of the dynamic damper 1 of the first embodiment. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 3 is a cross-sectional view taken along line BB in FIG.

  As shown in FIGS. 1 to 3, the dynamic damper 1 includes a mass member main body 11, two outer cylindrical fittings 12 and 13, two core member main bodies 14 and 15, and two inner cylindrical fittings 16. , 17, rubber elastic bodies 18 and 19, stopper rubbers 20 and 21, and bridging members 22 and 23.

  The mass member body 11 is made of metal. The mass member main body 11 has an oval shape in a front view and a shape having a predetermined thickness. The mass member main body 11 is formed with two through holes 11a and 11b penetrating in the thickness direction, that is, in the vertical direction of FIG. The inner peripheral surfaces of these through holes 11a and 11b are formed in a cylindrical shape, that is, with the same diameter in the axial direction. Furthermore, the central axes of these through holes 11a and 11b are formed in parallel. These through holes 11a and 11b pass through the centroid (center) of FIG. 1 of the mass member body 11 and are parallel to the vertical direction of FIG. 1 (the same as the “second plane Y” described later). Thus, it is formed to be plane symmetric.

  The outer cylinder fittings 12 and 13 are made of metal and formed in a cylindrical shape. The outer diameters of the outer cylinder fittings 12 and 13 are formed such that the outer cylinder fittings 12 and 13 can be press-fitted and fixed to the inner peripheral surfaces of the through holes 11 a and 11 b of the mass member main body 11. That is, the outer diameters of the outer cylinder fittings 12 and 13 are formed to be the same as or slightly larger than the inner diameters of the through holes 11a and 11b. The axial lengths of the outer cylinder fittings 12 and 13 are formed substantially equal to the thickness of the mass member main body 11. The first outer cylinder fitting 12 is fixed by press fitting inside the first through hole 11a. The second outer cylinder fitting 13 is fixed by press-fitting inside the second through hole 11b. Here, the mass member main body 11 and the two outer cylinder fittings 12 and 13 correspond to the “mass member” in the present invention. In the present embodiment, the “inner peripheral surface of the through hole of the mass member” in the present invention corresponds to the inner peripheral surface of the outer cylinder fittings 12 and 13.

  The core member bodies 14 and 15 are made of metal and are formed in a cylindrical shape. The outer diameters of these core member bodies 14 and 15 are formed to be smaller than the inner diameters of the outer cylinder fittings 12 and 13. The axial lengths of the core member bodies 14 and 15 are formed longer than the thickness of the mass member body 11. The two core member bodies 14 and 15 have the first core member body 14 inserted through the first through hole 11a so that the central axes thereof are parallel to each other, and the second core member body 15 is The second through hole 11b is inserted. Further, in the completed state shown in FIG. 1, the respective core member main bodies 14 and 15 are arranged coaxially with respect to the respective through holes 11 a and 11 b of the mass member main body 11. At this time, both ends of the core member main bodies 14 and 15 are disposed so as to protrude outward from both end faces of the mass member main body 11. Moreover, the internal peripheral side of these core member main bodies 14 and 15 is formed with a female screw, and mounting bolts 24 to 27 for connecting and fixing to bridging members 22 and 23 described later are screwed together.

  The inner cylinder fittings 16 and 17 are made of metal and formed in a cylindrical shape. The inner diameters of these inner cylinder fittings 16 and 17 are formed such that the inner cylinder fittings 16 and 17 can be press-fitted and fixed to the outer peripheral surfaces of the core member main bodies 14 and 15. That is, the inner diameters of the inner cylinder fittings 16 and 17 are formed to be the same as or slightly larger than the outer diameters of the core member bodies 14 and 15. Further, the outer diameters of the inner cylindrical fittings 16 and 17 are formed smaller than the inner diameter of the outer cylindrical fittings 12 and 13 so that they can be separated from the inner peripheral surfaces of the outer cylindrical fittings 12 and 13 in the radial direction. Yes. The axial lengths of the inner cylinder fittings 16 and 17 are slightly longer than the thickness of the mass member main body 11 and slightly shorter than the axial length of the core member main bodies 14 and 15. And the 1st inner cylinder metal fitting 16 is being fixed to the outer peripheral side of the 1st core member main body 14 by press injection. The second inner cylinder fitting 17 is fixed to the outer peripheral side of the second core member main body 14 by press-fitting. Here, the two core member main bodies 15 and 16 and the two inner cylinder fittings 16 and 17 correspond to the “core member” in the present invention. In the present embodiment, the “outer peripheral surface of the core member” in the present invention corresponds to the outer peripheral surfaces of the inner cylindrical fittings 16 and 17.

  The first rubber elastic body 18 is vulcanized and bonded to both the inner peripheral surface of the first outer cylinder fitting 12 and the outer peripheral surface of the first inner cylinder fitting 16 so as to be elastically connected. The first rubber elastic body 18 includes a first leg portion 18a and a second leg portion 18b. Here, a direction perpendicular to both central axes of the two core member bodies 14 and 15 is defined as a “first direction”. That is, this first direction is the left-right direction in FIG. The first leg 18 a and the second leg 18 b of the first rubber elastic body 18 are the first of the inner peripheral surface of the first outer cylinder fitting 12 and the outer circumference of the first inner cylinder fitting 16. It extends in a direction inclined in the circumferential direction of the core member main body 14 with respect to one direction.

  More specifically, the first leg portion of the first rubber elastic body 18 when the central axis side of the second inner cylinder fitting 17 is set to 0 degree around the center axis of the first inner cylinder fitting 16. 18a extends in a direction inclined about 80 degrees. On the other hand, the second leg 18b of the first rubber elastic body 18 extends in a direction inclined about 80 degrees in the direction opposite to the first leg 18a. That is, the first leg 18a and the second leg 18b of the first rubber elastic body 18 are plane-symmetric with respect to the first plane X passing through the central axes of the two inner cylindrical fittings 16 and 17. Is formed. Furthermore, the first leg 18a and the second leg 18b of the first rubber elastic body 18 are preloaded in the completed state shown in FIG. This will be described in detail in the item “Method of manufacturing dynamic damper 1” described later.

  The second rubber elastic body 19 is vulcanized and bonded to both the inner peripheral surface of the second outer cylinder fitting 13 and the outer peripheral surface of the second inner cylinder fitting 17 so as to be elastically connected. The second rubber elastic body 19 includes a first leg portion 19a and a second leg portion 19b. The first leg portion 19 a and the second leg portion 19 b of the second rubber elastic body 19 are the first of the inner peripheral surface of the second outer cylindrical fitting 13 and the outer peripheral surface of the second inner cylindrical fitting 17. It extends in a direction inclined in the circumferential direction of the core member body 15 with respect to one direction.

  More specifically, the first leg portion of the second rubber elastic body 19 when the central axis side of the first inner cylinder fitting 16 is set to 0 degree around the center axis of the second inner cylinder fitting 17. 19a extends in a direction inclined about 80 degrees. On the other hand, the second leg portion 19b of the second rubber elastic body 19 extends in a direction inclined about 80 degrees in the opposite direction to the first leg portion 19a. That is, the first leg portion 19a and the second leg portion 19b of the second rubber elastic body 19 are plane-symmetric with respect to the first plane X that passes through the central axes of the two inner cylindrical fittings 16 and 17. Is formed. Further, the second rubber elastic body 19 is formed in plane symmetry with respect to a second plane Y that is perpendicular to the first plane X and passes through an intermediate position between the central axes of the through holes 11a and 11b. Further, the first leg portion 19a and the second leg portion 19b of the second rubber elastic body 19 are preloaded in the completed state shown in FIG. This will be described in detail in the item “Method of manufacturing dynamic damper 1” described later.

  The first stopper rubber 20 is vulcanized and bonded to the inner peripheral surface of the first outer cylindrical metal member 12 so as to face the outer peripheral surface of the first inner cylindrical metal member 16 while being spaced apart. More specifically, the first stopper rubber 20 is formed in an area between the first inner cylinder fitting 16 and the second inner cylinder fitting 17 on the inner peripheral surface of the first outer cylinder fitting 12. Has been. That is, the first stopper rubber 20 has a function as a stopper when the first inner cylinder fitting 16 moves toward the second inner cylinder fitting 17 with respect to the first outer cylinder fitting 12.

  The second stopper rubber 21 is vulcanized and bonded to the inner peripheral surface of the second outer cylindrical metal member 13 so as to face the outer peripheral surface of the second inner cylindrical metal member 17 while being spaced apart. More specifically, the second stopper rubber 21 is formed in an area between the first inner cylinder fitting 16 and the second inner cylinder fitting 17 in the inner peripheral surface of the second outer cylinder fitting 13. Has been. That is, the second stopper rubber 21 has a function as a stopper when the second inner cylinder fitting 17 moves toward the first inner cylinder fitting 16 with respect to the second outer cylinder fitting 13.

  The bridging members 22 and 23 have an elongated rectangular parallelepiped shape, that is, a square bar shape. Two attachment holes 22a, 22b, 23a, and 23b are formed at both ends, respectively. One mounting hole 22a, 23a is formed in a circular shape, and the other mounting hole 22b, 23b is formed in an oval shape. The bridging members 22 and 23 couple the two core member main bodies 14 and 15 so as to bridge.

  Specifically, the circular mounting hole 22a of the first bridging member 22 is disposed coaxially with the first core member main body 14, the mounting bolt 24 is inserted into the mounting hole 22a, and the first core member main body 14 is inserted. The first bridging member 22 is connected to the first core member main body 14 by screwing onto the inner peripheral surface on one end side. On the other hand, the mounting bolt 25 is inserted into the oblong mounting hole 22b of the first bridging member 22 and screwed into the inner peripheral surface on one end side of the second core member main body 15, whereby the first bridging member 22 is connected to the second core member main body 15. At this time, the mounting bolt 25 is located on the circular mounting hole 22a side in the elliptical mounting hole 22b.

  Further, the circular mounting hole 23a of the second bridging member 23 is arranged coaxially with the first core member main body 14, the mounting bolt 26 is inserted into the mounting hole 23a, and the other end of the first core member main body 14 is inserted. The second bridging member 23 is connected to the first core member main body 14 by being screwed to the inner peripheral surface on the side. On the other hand, the mounting bolt 27 is inserted into the oblong mounting hole 23b of the second bridging member 23 and screwed into the inner peripheral surface on the other end side of the second core member main body 15, whereby the second bridging member The member 23 is connected to the second core member main body 15. At this time, the mounting bolt 27 is located on the circular mounting hole 23a side in the elliptical mounting hole 23b.

  Here, the oval mounting holes 22b and 23b of the bridging members 22 and 23 function as an adjustment allowance in order to position the rubber elastic bodies 18 and 19 in a state where a load is applied in advance. Further, the bridging members 22 and 23 are fixed to a vibration isolation target member (not shown). Examples of the vibration isolation target member include various parts such as a vehicle exhaust pipe and a power transmission shaft. Here, the two core member main bodies 15 and 16, the two inner cylinder fittings 16 and 17, and the bridging members 22 and 23 correspond to a “fixing member” in the present invention.

(Dynamic damper manufacturing method)
Next, a method for manufacturing the dynamic damper 1 described above will be described with reference to FIGS. FIG. 4 is a diagram for explaining the manufacturing process of the dynamic damper 1.

  As shown in FIG. 4A, the first rubber elastic body 18 is vulcanized and bonded to the inner peripheral surface of the first outer cylinder fitting 12 and the outer peripheral surface of the first inner cylinder fitting 16 (rubber vulcanization step). ). At the same time, the first stopper rubber 20 is vulcanized and bonded to the inner peripheral surface of the first outer cylinder fitting 12. Further, the second rubber elastic body 19 and the second stopper rubber 21 are similarly vulcanized and bonded. That is, the second rubber elastic body 19 is vulcanized and bonded to the inner peripheral surface of the second outer cylinder fitting 13 and the outer peripheral surface of the second inner cylinder fitting 17 (rubber vulcanization step). At the same time, the second stopper rubber 21 is vulcanized and bonded to the inner peripheral surface of the second outer cylinder fitting 13.

  The rubber elastic bodies 18 and 19 at this time will be described in detail. In the no-load state in which the rubber elastic bodies 18 and 19 are vulcanized, the outer cylinder fittings 12 and 13 and the inner cylinder fittings 16 and 17 are not positioned coaxially. Specifically, the rubber elastic bodies 18 and 19 are vulcanized and bonded to each other in a state where the central axes of the outer cylindrical fittings 12 and 13 and the central axes of the inner cylindrical fittings 16 and 17 are shifted by Δx, respectively. . More specifically, the first leg portion 18a and the second leg portion 18b of the first rubber elastic body 18 in the vulcanized molded state are centered on the central axis of the first inner cylindrical metal member 16 and the second leg portion 18b. When the central axis side of the inner cylindrical metal member 17 is set to 0 degree, the inner cylindrical metal part 17 extends in a direction inclined about 60 degrees toward the opposite side. The second rubber elastic body 19 has a symmetrical shape with the first rubber elastic body 18 but is formed in substantially the same manner.

  Subsequently, the outer cylindrical fittings 12 and 13 to which the rubber elastic bodies 18 and 19 are vulcanized and bonded are press-fitted into the inner peripheral surfaces of the through holes 11a and 11b of the mass member main body 11. Further, the inner cylinder fittings 16 and 17 to which the rubber elastic bodies 18 and 19 and the like are vulcanized and bonded are press-fitted into the outer peripheral surfaces of the core member bodies 14 and 15 respectively (press-fitting process).

  Subsequently, the bridging members 22 and 23 are fixed to the first core member body 14 by the mounting bolts 24 and 26 (first bridging member connecting step). At this time, the inner peripheral surface of the second core member main body 15 is positioned on the end side opposite to the circular mounting holes 22a and 23a among the elliptical mounting holes 22b and 23b of the bridging members 22 and 23. Yes.

  Subsequently, the mounting bolts 25 and 27 are inserted into the oval mounting holes 22 b and 23 b of the bridging members 22 and 23, and are temporarily fixed to the second core member main body 15. Then, the mounting bolts 25 and 27 are moved along the oval mounting holes 22b and 23b so that the separation distance between the first core member main body 14 and the second core member main body 15 is shortened. The first outer cylinder fitting 12 and the first inner cylinder fitting 16 are coaxially positioned, and the second outer cylinder fitting 13 and the second inner cylinder fitting 17 are positioned coaxially. At this time, the mounting bolts 25 and 27 are fixed to the second core member main body 15 (second bridging member connecting step).

(Characteristics of rubber elastic bodies 18 and 19 and frequency characteristics of dynamic damper 1)
Next, in the dynamic damper 1 manufactured as described above, the characteristics of the rubber elastic bodies 18 and 19 will be described with reference to FIG. 5, and the frequency characteristics of the dynamic damper 1 will be described with reference to FIG.

  5 indicates the relationship between the displacement in the first direction of the rubber elastic bodies 18 and 19 and the force generated in the first direction. Here, the displacement is positive in the direction in which the two inner cylinder fittings 16 are close to each other. That is, the rubber elastic bodies 18 and 19 have a relationship in which the generated force increases as the displacement increases from the no-load state. In the first region having this relationship, the rubber elastic bodies 18 and 19 are compressed and sheared. Thereafter, when the displacement is further increased, the generated force becomes a constant relationship. In the second region having this relationship, the rubber elastic bodies 18 and 19 undergo shear deformation and buckling deformation. Furthermore, when the displacement is increased, the generated force is increased.

  The rubber elastic bodies 18 and 19 are loaded in advance as described above. The displacement of the rubber elastic bodies 18 and 19 at this time is set to be approximately near the center of the second region. That is, in a no-load state in which the rubber elastic bodies 18 and 19 are vulcanized, a deviation amount Δx between the center axis of the outer cylinder fittings 12 and 13 and the center axis of the inner cylinder fittings 16 and 17 is the second region. It is made to correspond to the displacement around the center.

  In this way, when the rubber elastic bodies 18 and 19 are preloaded, the mass member main body 11 moves relative to the core member main bodies 14 and 15 as the vibration isolation target member vibrates. Even if the rubber elastic bodies 18 and 19 are displaced, the force generated in the rubber elastic bodies 18 and 19 is constant.

  The frequency characteristic of such a dynamic damper 1 is as shown in FIG. That is, it is possible to obtain frequency characteristics having a region where the maximum gain is substantially constant in a predetermined frequency band. In other words, the resonance frequency of the dynamic damper has a predetermined frequency band. Therefore, even if the resonance frequency of the dynamic damper 1 changes due to changes in temperature and amplitude, the resonance frequency has a predetermined frequency band, so that an appropriate vibration isolation effect can be exhibited.

<Second embodiment>
Next, the dynamic damper 100 of 2nd embodiment is demonstrated with reference to FIG. FIG. 7A is a front view of the dynamic damper 100 in a state before the bridging members 22 and 23 are attached. FIG. 7B is a front view of the dynamic damper 100 in a completed state. Here, the dynamic damper 100 in the second embodiment is different from the dynamic damper 1 in the first embodiment in rubber elastic bodies 118 and 119. Therefore, only the rubber elastic bodies 118 and 119 will be described, and the other components are denoted by the same reference numerals and description thereof is omitted.

  The rubber elastic bodies 118 and 119 are vulcanized and bonded to each other in a state where the central axes of the outer cylindrical fittings 12 and 13 and the central axes of the inner cylindrical fittings 16 and 17 are shifted by Δx, respectively. The rubber elastic bodies 118 and 119 include first leg portions 118a and 119a and second leg portions 118b and 119b, respectively. The first leg portion 118a and the second leg portion 118b of the rubber elastic body 118 in the vulcanized and molded state are centered on the center axis of the first inner cylinder fitting 16 and the center of the second inner cylinder fitting 17. When the axial side is set to 0 degree, each extends in the direction inclined about 90 degrees toward the opposite side. That is, the first leg 118 a and the second leg 118 b extend in a direction orthogonal to the first direction X. The second rubber elastic body 119 is substantially the same as the first rubber elastic body 118.

  Then, the bridging members 22 and 23 are fixed to the core member bodies 14 and 15 so that the distance between the first core member body 14 and the second core member body 15 is shortened. Specifically, the first outer cylinder fitting 12 and the first inner cylinder fitting 16 are coaxially arranged, and the second outer cylinder fitting 13 and the second inner cylinder fitting 17 are arranged coaxially. The bridging members 22 and 23 are fixed to the core member main bodies 14 and 15 so as to be in a state.

  In the dynamic damper 100 of the second embodiment, the relationship between the displacement in the first direction of the rubber elastic bodies 118 and 119 and the force generated in the first direction will be described with reference to FIG. As indicated by the thin solid line in FIG. 5, the rubber elastic bodies 118 and 119 have a relationship in which the generated force increases as the displacement increases from the no-load state. In the first region having this relationship, the rubber elastic bodies 118 and 119 are subjected to shear deformation and tensile deformation. Thereafter, when the displacement is further increased, the resulting force becomes a substantially constant relationship. In the second region having this relationship, the rubber elastic bodies 118 and 119 are in a state where only tensile deformation has occurred.

  Similar to the dynamic damper 1 of the first embodiment, the dynamic damper 100 also has frequency characteristics having a region where the maximum gain is substantially constant in a predetermined frequency band. Therefore, even in this case, even if the resonance frequency of the dynamic damper 100 changes due to changes in temperature and amplitude, the resonance frequency has a predetermined frequency band, and therefore, an appropriate vibration isolation effect can be exhibited.

  Here, the force generated in the rubber elastic bodies 118 and 119 in the second region in the second embodiment is smaller than the force generated in the rubber elastic bodies 18 and 19 in the second region in the first embodiment. From this, in the frequency characteristic of the dynamic damper 100 of the second embodiment, the resonance frequency having a predetermined frequency band is different from that of the dynamic damper 1 of the first embodiment. That is, a predetermined frequency band of the resonance frequency can be freely set by appropriately changing the direction of vulcanization molding of the rubber elastic body.

<Third embodiment, fourth embodiment>
Next, the dynamic damper 200 of the third embodiment and the dynamic damper 300 of the fourth embodiment will be described with reference to FIGS. 8 and 9, respectively. FIG. 8A is a front view of the dynamic damper 200 in a state before the bridging members 22 and 23 are attached. FIG. 8B is a front view of the dynamic damper 200 in a completed state. FIG. 9A is a front view of the dynamic damper 300 in a state before the bridging members 22 and 23 are attached. FIG. 9B is a front view of the dynamic damper 300 in a completed state. Here, the dynamic dampers 200 and 300 in the third embodiment and the fourth embodiment are different from the dynamic damper 1 of the first embodiment in rubber elastic bodies 218, 219, 318, and 319. Therefore, only the rubber elastic bodies 218, 219, 318, and 319 will be described, and the other components will be denoted by the same reference numerals and description thereof will be omitted.

  The rubber elastic bodies 218 and 219 constituting the dynamic damper 200 of the third embodiment are configured such that the center axis of the outer cylinder fittings 12 and 13 and the center axis of the inner cylinder fittings 16 and 17 are shifted by Δx, respectively. Is vulcanized and bonded. The rubber elastic bodies 218 and 219 include first leg portions 218a and 219a and second leg portions 218b and 219b, respectively.

  Here, among the inner peripheral surfaces of the first outer cylinder fitting 12, the second outer cylinder fitting 13 and the first rubber elastic body 218 are more than the central axis of the first inner cylinder fitting 14 in the unloaded state. Defines the opposite side surface as the "first far side inner peripheral surface". Further, of the inner peripheral surface of the second outer cylinder fitting 13, the first outer cylinder fitting 12 is more than the central axis of the second inner cylinder fitting 15 when the second rubber elastic body 219 is in an unloaded state. The surface on the opposite side is defined as the “second far side inner peripheral surface”.

  That is, the first rubber elastic body 218 elastically connects the first far-side inner peripheral surface of the inner peripheral surface of the first outer cylindrical fitting 12 and the outer peripheral surface of the first inner cylindrical fitting 14. Yes. Specifically, the first leg portion 218a and the second leg portion 218b of the rubber elastic body 218 in the vulcanized molding state are centered on the central axis of the first inner cylinder fitting 16, and the second inner cylinder fitting. When the central axis side of 17 is set to 0 degree, it extends in a direction inclined about 120 degrees toward the opposite side.

  The second rubber elastic body 219 elastically connects the second far-side inner peripheral surface of the inner peripheral surface of the second outer cylindrical fitting 13 and the outer peripheral surface of the second inner cylindrical fitting 15. Yes. Specifically, the second rubber elastic body 219 has a symmetrical shape with the first rubber elastic body 218, but is substantially the same.

  The rubber elastic bodies 318 and 319 constituting the dynamic damper 200 of the fourth embodiment are configured such that the center axis of the outer cylinder fittings 12 and 13 and the center axis of the inner cylinder fittings 16 and 17 are shifted by Δx, respectively. Is vulcanized and bonded.

  That is, the first rubber elastic body 318 has a first direction out of the inner peripheral surface of the first outer tubular fitting 12 and the first far-side inner peripheral surface and the outer peripheral surface of the first inner tubular fitting 14. It is elastically connected so that it may extend. As described above, the first direction is a direction perpendicular to both central axes of the two core member bodies 14 and 15. Further, the second rubber elastic body 319 includes the first of the second inner peripheral surface of the second outer cylindrical fitting 13 and the outer peripheral surface of the second inner cylindrical fitting 15. Elastically connected to extend in the direction.

  In the dynamic dampers 200 and 300 of the third and fourth embodiments, the relationship between the displacement in the first direction of the rubber elastic bodies 218, 219, 318 and 319 and the force generated in the first direction will be described with reference to FIG. explain. The case of the third embodiment is indicated by a thick broken line in FIG. 5, and the case of the fourth embodiment is indicated by a thin broken line in FIG. As shown in FIG. 5, the rubber elastic bodies 218, 219, 318, and 319 have a relationship in which the generated force increases as the displacement increases from the no-load state. In the first region having this relationship, the rubber elastic bodies 218, 219, 318, and 319 are substantially tensile deformed. Thereafter, when the displacement is further increased, the resulting force becomes a substantially constant relationship. Also in the second region having this relationship, the rubber elastic bodies 218, 219, 318, and 319 are almost in a state where only tensile deformation occurs.

  Similar to the dynamic damper 1 of the first embodiment, these dynamic dampers 200 and 300 also have frequency characteristics having a region in which the maximum gain is substantially constant in a predetermined frequency band. Accordingly, even in this case, even if the resonance frequency of the dynamic dampers 200 and 300 changes due to changes in temperature and amplitude, the resonance frequency has a predetermined frequency band, so that an appropriate vibration-proofing effect can be exhibited. .

  Here, the force generated in the rubber elastic bodies 218, 219, 318, 319 in the second region in the third and fourth embodiments is the rubber elastic bodies 18, 19, in the second region in the first and second embodiments. The force generated at 118 and 119 is small. Therefore, in the frequency characteristics of the dynamic dampers 200 and 300 of the third and fourth embodiments, the resonance frequency having a predetermined frequency band is different from that of the dynamic dampers 1 and 100 of the first and second embodiments. Furthermore, the force generated in the rubber elastic bodies 318 and 319 in the second region in the fourth embodiment is smaller than the force generated in the rubber elastic bodies 218 and 219 in the second region in the third embodiment. From this, in the frequency characteristic of the dynamic damper 200 of the third embodiment, the resonance frequency having a predetermined frequency band is different from that of the dynamic damper 300 of the fourth embodiment.

  That is, the predetermined frequency band of the resonance frequency can be freely set by appropriately changing the direction of vulcanization molding of the rubber elastic body as in the first to fourth embodiments.

It is a front view of the completed state of the dynamic damper 1 of 1st embodiment. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. 5 is a diagram for explaining a manufacturing process of the dynamic damper 1. FIG. It is a figure which shows the characteristic of the rubber elastic bodies 18 and 19. It is a figure which shows the frequency characteristic of dynamic damper 1,100,200,300. It is a front view of the dynamic damper 100 of 2nd embodiment. It is a front view of the dynamic damper 200 of 3rd embodiment. It is a front view of the dynamic damper 300 of 4th embodiment.

Explanation of symbols

1, 100, 200, 300: Dynamic damper,
11: Mass member main body, 11a, 11b: Through hole,
12, 13: Outer cylinder fitting, 14, 15: Core member body, 16, 17: Inner cylinder fitting,
18, 19, 118, 119, 218, 219, 318, 319: rubber elastic body,
18a, 19a, 118a, 119a, 218a, 219a: the first leg of the rubber elastic body,
18b, 19b, 118b, 119b, 218b, 219b: the second leg portion of the rubber elastic body,
20, 21: Stopper rubber,
22, 23: Cross-linking member,
22a, 23a: circular mounting holes, 22b, 23b: oval mounting holes,
24-27: Mounting bolt

Claims (7)

A mass member in which two through holes whose central axes are parallel to each other are formed;
Two core members that are columnar or cylindrical and are inserted through the through holes so that their central axes are parallel to each other, and the two core members are connected so as to be bridged and are vibration-proof target members A fixing member comprising a bridging member fixed to
A rubber elastic body that elastically connects the inner peripheral surface of each of the through holes and the outer peripheral surface of each of the core members;
In a dynamic damper comprising
A direction perpendicular to both central axes of the two core members is defined as a first direction,
The rubber elastic body is elastically connected in a direction inclined in the circumferential direction of the core member with respect to the first direction among the inner peripheral surface of the through hole and the outer peripheral surface of the core member,
The bridging member connects the core members so that the distance between the two core members is short with respect to the position of the core members when the rubber elastic body is in an unloaded state. A dynamic damper characterized by preloading an elastic body. A mass member in which two through holes whose central axes are parallel to each other are formed;
Two core members that are columnar or cylindrical and are inserted through the through holes so that their central axes are parallel to each other, and the two core members are connected so as to be bridged and are vibration-proof target members A fixing member comprising a bridging member fixed to
A rubber elastic body that elastically connects the inner peripheral surface of each of the through holes and the outer peripheral surface of each of the core members;
In a dynamic damper comprising
Of the inner peripheral surface of one of the through holes, the rubber elastic body is opposite to the other through hole than the central axis of one of the core members inserted into the one through hole in an unloaded state. The side surface is defined as the far side inner peripheral surface,
The rubber elastic body elastically connects the far side inner peripheral surface and the outer peripheral surface of the core member;
The bridging member connects the core members so that the distance between the two core members is short with respect to the position of the core members when the rubber elastic body is in an unloaded state. A dynamic damper characterized by preloading an elastic body.   3. The rubber elastic body according to claim 1, wherein the rubber elastic body elastically connects the inner peripheral surface of one of the through holes and the outer peripheral surface of one of the core members inserted through the one through hole at two or more locations. Dynamic damper. The dynamic damper according to claim 1, wherein the rubber elastic body is formed symmetrically with respect to a first plane passing through both central axes of the two core members.   The rubber elastic body is formed in plane symmetry with respect to a second plane that is perpendicular to the first plane passing through both central axes of the two core members and passes through the intermediate position of the central axis of the through hole. The dynamic damper according to claim 1 or 2. A mass member in which two through holes whose central axes are parallel to each other are formed;
Two core members that are columnar or cylindrical and are inserted through the through holes so that their central axes are parallel to each other, and the two core members are connected so as to be bridged and are vibration-proof target members A fixing member comprising a bridging member fixed to
A rubber elastic body that elastically connects the inner peripheral surface of each of the through holes and the outer peripheral surface of each of the core members;
In a manufacturing method of a dynamic damper comprising:
A direction perpendicular to both central axes of the two core members is defined as a first direction,
A rubber vulcanization step of vulcanizing and bonding the rubber elastic body in a direction inclined in the circumferential direction of the core member with respect to the first direction among the inner peripheral surface of the through hole and the outer peripheral surface of the core member;
After the rubber vulcanization step, the bridging members are connected to the cores so that the distance between the two core members becomes shorter than the positions of the core members when the rubber elastic body is in an unloaded state. A bridging member connecting step of connecting to a member and preloading the rubber elastic body;
A method of manufacturing a dynamic damper, comprising: A mass member in which two through holes whose central axes are parallel to each other are formed;
Two core members that are columnar or cylindrical and are inserted through the through-holes so that the central axes are parallel to each other, and the two core members are connected so as to be bridged and are vibration-proof target members A fixing member comprising a bridging member fixed to
A rubber elastic body that elastically connects an inner peripheral surface of each of the through holes and an outer peripheral surface of the core member;
In a manufacturing method of a dynamic damper comprising:
Of the inner peripheral surface of one of the through holes, the rubber elastic body is opposite to the other through hole than the central axis of the one core member inserted through the one through hole in an unloaded state. The side surface is defined as the far side inner peripheral surface,
A rubber vulcanization step of vulcanizing and bonding the rubber elastic body to the far side inner circumferential surface and the outer circumferential surface of the core member;
After the rubber vulcanization step, the bridging members are connected to the cores so that the distance between the two core members becomes shorter than the positions of the core members when the rubber elastic body is in an unloaded state. A bridging member connecting step of connecting to a member and preloading the rubber elastic body;
A method of manufacturing a dynamic damper, comprising:

Images