JP5427096B2 - Dynamic damper - Google Patents

Description

  The present invention relates to a dynamic damper connected to a steering wheel, and more particularly to a dynamic damper that is excellent in durability and improves productivity.

  In order to prevent the steering wheel from resonating due to vibration during idling or running, a dynamic damper is attached to the boss portion or spoke of the steering wheel. The dynamic damper includes a bracket member to be attached to a boss part and a spoke, a mass member as a mass body, a vibration isolating base made of a rubber-like elastic material and connecting the bracket member and the mass member. I have. The vibration can be reduced by setting the mass of the mass member and the spring constant of the vibration isolating base and making the resonance frequency of the dynamic damper coincide with the peak frequency of the vibration of the steering wheel. As such a dynamic damper, for example, one disclosed in Patent Document 1 is known. In the vibration suppressing device (dynamic damper) disclosed in Patent Document 1, the opposing surfaces of the damper plate (bracket member) and the mass body (mass member) are connected by an elastic support (vibration-proof base).

  A method of manufacturing a dynamic damper disclosed in Patent Document 1 will be described with reference to FIG. FIG. 9 is a cross-sectional view of a mold 100 in which a bracket member 110 and a mass member 120 constituting a conventional dynamic damper are assembled. The anti-vibration base is molded by assembling the bracket member 110 and the mass member 120 to the mold 100 and closing the mold, and then injecting a rubber-like elastic material into the cavity 103 from the supply path 101 of the mold 100 through the gate 102. . The rubber-like elastic material injected into the cavity 103 is bonded to the bracket member 110 and the mass member 120 by vulcanization. After the rubber-like elastic material is cured, it is released from the mold, and the rubber-like elastic material cured in the vicinity of the gate 102 is cut to obtain a dynamic damper in which the bracket member 110 and the mass member 120 are connected by a vibration-proof base.

Japanese Utility Model Publication No. 6-61652

  However, in the above-described conventional dynamic damper, when the rubber-like elastic material is cut in the vicinity of the gate, a cut mark may remain on the outer peripheral surface of the vibration-proof base. If the cutting trace remains on the outer peripheral surface of the vibration isolating substrate, vibration is propagated to the dynamic damper, and when the vibration isolating substrate is repeatedly deformed, a crack is generated starting from the cutting trace, and the crack grows and the vibration isolating substrate grows. Destruction and changes in spring characteristics may occur. For this reason, there existed a problem that durability of a dynamic damper fell.

  Further, in order to improve the durability of the dynamic damper, there is a problem that if the finishing process is performed so that no cutting trace remains on the outer peripheral surface of the vibration-proof base, the manufacturing process becomes complicated and the productivity is lowered.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a dynamic damper that is excellent in durability and improves productivity.

Means for Solving the Problems and Effects of the Invention

In order to achieve this object, according to the dynamic damper of claim 1, a plurality of through holes are formed through a plurality of locations of the bracket member, and the mass member and the bracket member are formed at the positions of the through holes. An anti-vibration base is connected between the surface facing the one surface side. Therefore, when manufacturing a vibration damping base for a dynamic damper, the bracket member and the mass member are assembled to the mold, the gate is aligned with the through hole on the other side of the bracket member, and the rubber is placed in the cavity through the through hole. Can be injected. As a result, the cut mark after the vibration-proof substrate is cured is formed on the other surface side of the bracket member. The load of the mass member becomes the load of the vibration isolating base that connects the mass member and one surface side of the bracket member, but does not become the load of the cut trace formed on the other surface side of the bracket member. For this reason, the cut trace is unlikely to become a starting point of the vibration-proof substrate, and even if a crack occurs in the vibration-proof substrate starting from the cut mark, it is difficult to grow the crack. Therefore, there is an effect that the durability of the dynamic damper can be improved.
In addition, since the cut trace is unlikely to become the starting point of the vibration-proof base, it is possible to eliminate the need for finishing so as not to leave a cut trace, and to improve productivity.

Since the mass member has a main body portion in which a curved facing surface facing the steering wheel side member is formed horizontally long, the volume of the mass member is ensured to a maximum in a narrow space on the steering side. The mass can be increased. Furthermore, the mass member includes a recessed portion that is recessed from the bottom surface that intersects the opposing surface of the main body portion and that is opposed to each other and that has an inner wall along the short direction of the main body portion. A pair of bent parts facing the inner wall of the recessed part while being bent from both side edges of the part, and the anti-vibration base is connected in parallel with the mounting plate part from the pair of bent parts. Since the pair of connecting portions are provided, the mass member can be enlarged and set to have a large mass at both sides of the bent portion and the opposing position of the connecting portion without being restricted by the bracket member.
Here, in the steering wheel, vibration at a relatively low frequency becomes a problem. By increasing the mass of the mass member without changing the spring constant of the anti-vibration base, the resonance frequency of the dynamic damper is shifted to the low frequency side. Can be made. According to the dynamic damper of the first aspect, since the mass of the mass member can be set large, the resonance frequency of the dynamic damper is shifted to the low frequency side, and the peak frequency of the vibration of the steering wheel is relatively easily matched. You can make it happen. Thereby, there is an effect that the degree of freedom in designing the dynamic damper for reducing the vibration of the steering wheel can be improved.
In addition, since the bracket member includes a bent portion bent from the attachment plate portion and a connecting portion bent from the bent portion, the mechanical strength of the bracket member is increased and durability is increased. There is an effect to improve.

  According to a second aspect of the present invention, the dynamic damper includes a rubber-like elastic material that is integral with the vibration-proof base, and includes a through portion that is formed to be narrowed in the radial direction of the through hole and penetrates the through hole. Therefore, the vibration isolating base cannot pass through the through hole, and the movement of the vibration isolating base toward the bracket member is restricted. In addition, it is composed of a rubber-like elastic material that is integral with the penetrating part, and includes an overhanging part that is located on the opposite surface side of the bracket member and that projects from the penetrating part to the outside in the radial direction of the through hole. Therefore, the overhanging portion cannot pass through the through hole, and the movement of the vibration isolating base to the side opposite to the bracket member is restricted. As a result, the bracket member and the anti-vibration base can be connected without vulcanizing and bonding the bracket member and the anti-vibration base, or even with a small amount of adhesive applied to the bracket member and the anti-vibration base. It becomes possible to do. Thereby, in addition to the effect of Claim 1, there exists an effect which can abbreviate | omit the application | coating process of an adhesive agent, and can reduce the application quantity of an adhesive agent.

  According to the dynamic damper of the third aspect, since the buffer member is provided that is bonded to at least a part of the facing surface of the mass member facing the steering wheel side member, the mass member is large when traveling on a rough road. When swinging, the buffer portion collides with the member on the steering wheel side. Thereby, in addition to the effect of Claim 1 or 2, it is effective in preventing that a mass member collides with the member by the side of a steering wheel, and suppressing generation | occurrence | production of unusual noise.

  In addition, since the shock-absorbing member is made of a rubber-like elastic material that is integral with the vibration-proof base, the vibration-proof base and the shock-absorbing base can be bonded to the mass member at the same time, simplifying the manufacturing process. There is an effect that productivity can be improved.

It is a perspective view of the dynamic damper in one embodiment of the present invention. It is a perspective view of a dynamic damper. (A) is a plan view of the bracket member, (b) is a front view of the bracket member in the direction of arrow IIIb in FIG. 3 (a), and (c) is in the direction of arrow IIIc in FIG. 3 (a). It is a rear view of a bracket member, (d) is a side view of the bracket member in the arrow IIId direction view of FIG.3 (b). (A) is a top view of a mass member, (b) is a rear view of the mass member in the arrow IVb direction view of Fig.4 (a). (A) is a plan view of the dynamic damper, (b) is a front view of the dynamic damper in the direction of arrow Vb in FIG. 5 (a), and (c) is in the direction of arrow Vc in FIG. 5 (a). It is a rear view of a dynamic damper. 5A is a sectional end view of the dynamic damper taken along the line VIa-VIa in FIG. 5B, and FIG. 5B is a sectional end view of the dynamic damper taken along the line VIb-VIb in FIG. It is sectional drawing of the metal mold | die with which the bracket member and the mass member were assembled | attached. It is a front view of a steering wheel. It is sectional drawing of the metal mold | die with which the bracket member and mass member which comprise the conventional dynamic damper were assembled | attached.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view of a dynamic damper 1 according to an embodiment of the present invention, illustrating a state viewed from the direction of the facing surface 21a. FIG. 2 is a perspective view of the dynamic damper 1, illustrating a state viewed from the bottom surface 21c direction. A plurality of the same configurations are denoted by reference numerals in a part of the plurality of configurations to simplify the drawing.

  The dynamic damper 1 is a device that is connected to a vehicle steering wheel 70 (see FIG. 8) and suppresses vibration of the steering wheel 70. The dynamic damper 1 includes a bracket member 10 connected to the steering wheel 70, a mass member 20 functioning as a mass body, and connects the bracket member 10 and the mass member 20 to each other and is made of a rubber-like elastic material. 30 and a buffer member 40 attached to the mass member 20.

  The bracket member 10 is formed by pressing, punching, or the like of a metal material. As shown in FIG. 2, the horizontally long attachment plate portion 11 attached to the steering wheel 70 side, and the attachment plate portion 11 side. A pair of extending portions 12 as a part of the mounting plate portion extending from both sides of the edge, and a pair of first bent portions that are bent substantially vertically from one side edge of the extending portion 12. 13 and a first connecting portion 14 that is bent in a direction parallel to the mounting plate portion 11 on the opposite side from the first bending portion 13 to the mounting plate portion 11 and formed in a stepped shape with the mounting plate portion 11. And is configured. The bracket member 10 is surrounded by the attachment plate portion 11, the extending portion 12, the first bent portion 13, and the first connecting portion 14, and an opening 10 a is formed. By forming the opening 10a, it is possible to reduce the component cost and reduce the weight of the bracket member 10.

  The bracket member 10 includes a pair of second bent portions 15 that are bent substantially perpendicularly from the other side edge of the extended portion 12 and in a direction substantially orthogonal to the first bent portion 13, and a second bent portion. The second connecting portion 16 is bent toward the outside from 15 and formed in a step shape parallel to the attachment plate portion 11. Crushing ribs 15a and 15b are formed on the ridgeline between the extended portion 12 and the second bent portion 15 and the ridgeline between the second bent portion 15 and the second connecting portion 16, respectively. By forming the crushing ribs 15a and 15b, the rigidity of the second bent portion 15 and the second connecting portion 16 can be improved. Therefore, the thickness of the bracket member 10 is reduced to reduce the component cost and the weight. be able to.

  Further, the bracket member 10 is bent from both ends of the first connecting portion 14 and the side edges of the second connecting portion 16 and is formed to project from the first connecting portion 14 and the second connecting portion 16 in a step shape. 14a and a second protrusion 16a. The first protrusion 14a and the second protrusion 16a are used to fix the bracket member 10 to the mold 60 when the bracket member 10 is assembled to the mold 60 (see FIG. 7) for molding the vibration isolation base 30. It is a part.

  The mass member 20 is made of a metal material such as cast iron, and as shown in FIG. 1, a horizontally long main body portion 21 having a convexly curved facing surface 21 a and a bottom surface 21 a intersecting the facing surface of the main body portion 21. The 1st protrusion part 22 which protrudes in a transversal direction from the 2nd protrusion part 23 which protrudes from the back surface 21b which is an opposite surface with respect to the opposing surface 21a of the main-body part 21 is provided. In the present embodiment, the mass member 20 includes a first recessed portion 24 formed by recessing a part of the bottom surface 21 c at a substantially central portion of the bottom surface 21 c of the main body portion 21, and a substantially central portion of the first recessed portion 24. And a central recessed portion 24a formed by recessing a part thereof.

  The mass member 20 includes a second recessed portion 25 that is recessed in the back surface 21b and the bottom surface 21c of the main body portion 21. The second recessed portion 25 is located substantially at the center of the back surface 21b of the main body portion 21 and is formed from the bottom surface 21c of the main body portion 21 through the back surface 21b to the upper surface 21d. At least a part of the first bent portion 13 and the second bent portion 15 is disposed so as to protrude inside the second recessed portion 25. Thereby, compared with the dynamic damper in which the 2nd recessed part 25 is not formed, the distance from the attachment board part 11 of the bracket member 10 to the opposing surface 21a of the mass member 20 can be shortened, and the dynamic damper 1 Can be miniaturized.

  The anti-vibration base 30 is a member that connects the bracket member 10 and the bottom surface 21 c of the main body 21 of the mass member 20. In the present embodiment, the first base 31 that connects the first connecting portion 14 of the bracket member 10 and the central recessed portion 24 a of the mass member 20, the second connecting portion 16 of the bracket member 10, and the bottom surface 21 a of the mass member 30. A pair of second base bodies 35 that connect the first projecting portions 23 projecting on both sides from the first base 23 are provided. As shown in FIG. 2, the first connecting portion 14 of the bracket member 10 is disposed closer to the facing surface 21 a side of the mass member 20 with respect to the second connecting portion 16. It is located away from the straight line passing through the two base bodies 35 toward the facing surface 21 a of the mass member 20. Further, since the first connecting portion 14 of the bracket member 10 is connected to the central recessed portion 24 a of the mass member 20, the first base 31 is separated from the straight line passing through the second base 32 toward the upper surface 21 d of the mass member 20. To position. As a result, it is possible to obtain an effective damping effect against the vibration in the longitudinal direction and the short direction of the mass member 20 and the vibration in the torsional direction, and to suppress the vibration of the steering wheel 70 (see FIG. 8). Can be obtained in a wide frequency band.

  The buffer member 40 is a member that is adhered to the mass member 20, and suppresses an impact when the mass member 20 vibrates greatly and collides with a member on the steering wheel 70 side, thereby preventing abnormal noise from being generated. It is a member to do. In the present embodiment, the buffer member 40 is made of a rubber-like elastic material, and is attached to both ends of the first buffer portion 41 attached to both ends of the opposing surface 21 a of the mass member 20 and the back surface 21 b of the mass member 20. The second buffer portion 42 to be attached and the third buffer portion 43 to be attached to the approximate center of the facing surface 21a of the mass member 20 are provided.

  Next, the bracket member 10 will be described with reference to FIG. 3 (a) is a plan view of the bracket member 10 of the dynamic damper 1, and FIG. 3 (b) is a front view of the bracket member 10 as viewed in the direction of arrow IIIb in FIG. 3 (a). FIG. 3 is a rear view of the bracket member 10 as viewed in the direction of arrow IIIc in FIG. 3A, and FIG. 3D is a side view of the bracket member 10 in the direction of arrow IIId in FIG.

  As shown in FIG. 3A, the attachment member 11 of the bracket member 10 is a part connected to the steering wheel 70 side via fastening means such as a bolt, and the attachment hole 11a through which the fastening means is inserted. Are drilled at two locations on the left and right, and pin insertion holes 11b are drilled at two locations inside the attachment hole 11a. The pin insertion hole 11b is a part into which a fixing pin (not shown) is inserted when the bracket member 10 is assembled to a mold 60 (see FIG. 7) for molding the vibration isolation base 30. Furthermore, the attachment plate part 11 is provided with a notch 11c which enters into an arc shape on the back side. By forming the notch 11c, it is possible to prevent interference with the steering shaft 72 when the attachment plate portion 11 is attached to a member on the steering wheel 70 (see FIG. 8) side.

  Further, as shown in FIG. 3A, a positioning recess 10 c is formed on the side edge of the boundary between the attachment plate portion 11 and the extending portion 12 of the bracket member 10. Since the positioning recess 10c is formed, it is possible to improve the positional accuracy of assembling the bracket member 10 to the mold 60 (see FIG. 7) for molding the vibration isolation base 30. Moreover, the 1st bending part 13 and the 2nd bending part 15 are bent in the separate direction from the extension part 12, and are mutually spaced apart and the open part 10b is formed. By forming the opening 10b, the bracket member 10 can be reduced in weight.

  As shown in FIG. 3B, the second connecting portion 16 of the bracket member 10 has both sides projecting from the attachment plate portion 11 and is formed narrower toward both ends in plan view. Thereby, the bracket member 10 can be connected to the steering wheel 70 in which it is difficult to ensure a wide mounting space. The 1st connection part 14 and the 2nd connection part 16 of the bracket member 10 are equipped with the 1st through-hole 14b and the 2nd through-hole 16b which are penetrated and formed in the plate | board thickness direction, respectively in the approximate center. The anti-vibration base 30 is connected to the first connecting portion 14 and the second connecting portion 16 at the positions of the first through hole 14b and the second through hole 16b. As shown in FIG. The protruding portion 34 is covered, and the second projecting portion 38 is covered with the second through hole 16b. The 2nd overhang | projection parts 34 and 38 are formed with the rubber-like elastic material.

  Since the bracket member 10 includes the opening 10a formed by being surrounded by the attachment plate portion 11, the extending portion 12, the first bent portion 13, and the first connecting portion 15, in the first connecting portion 14, The portion where the first through hole 14b is formed is the first bent portion 13, the second bent portion 15 and the like in the direction of arrow IIIb and the direction of arrow IIIc shown in FIGS. 3 (b) and 3 (c). It is possible to prevent the bracket member 10 from overlapping with other parts. Furthermore, since the portion where the second through hole 16b is formed in the second connecting portion 16 projects outward from the second bent portion 15, the direction of the arrow IIIb shown in FIGS. 3 (b) and 3 (c) When viewed and viewed in the direction of the arrow IIIc, it is prevented from overlapping with other portions of the bracket member 10 such as the first bent portion 13 and the second bent portion 15. Thereby, when the vibration isolator base 30 is formed by assembling the bracket member 10 and the mass member 20 to the mold 60 (see FIG. 7), a movable mold in the direction of the arrow IIIb or the direction of the arrow IIIc can be used. The mold can be easily closed, and the molding workability of the vibration-proof substrate 30 can be improved.

  The first protrusion 14 a and the second protrusion 16 a are portions for fixing the bracket member 10 to the mold 60 when the bracket member 10 is assembled to the mold 60 for forming the vibration isolation base 30. However, the first protrusion 14a bent from both sides of the first connecting portion 14 is formed to overlap the second bent portion 15 and the second connecting portion 16 in the direction of the arrow IIIb shown in FIG. Therefore, the dynamic damper 1 can be made compact, and the bracket member 10 can be connected to the steering wheel 70 (see FIG. 8), in which it is difficult to secure a wide mounting space.

  Next, the mass member 20 will be described with reference to FIG. 4A is a plan view of the mass member 20 of the dynamic damper 1, and FIG. 4B is a rear view of the mass member 20 as viewed in the direction of the arrow IVb in FIG. 4A.

  As shown in FIG. 4A, the mass member 20 includes second projecting portions 23 that project from both sides of the second recessed portion 25 to the back surface 21 b side. Since the 1st protrusion part 23 is provided, the volume of the mass member 20 can be increased on the back surface 21b side, and the mass of the mass member 20 can be increased.

  As shown in FIG. 4B, the mass member 20 includes first protrusions 22 that protrude from both sides of the first recess 24 toward the bottom surface 21 c. Since the first protrusion 22 is provided, the mass of the mass member 20 can be increased by increasing the volume of the mass member 20 on the bottom surface 21c side. The second recessed portion 25 formed from the bottom surface 21c of the main body 21 to the upper surface 21d is formed such that the distance between the opposing inner walls is shorter on the upper surface side than on the bottom surface side. That is, among the opposing inner walls of the second recessed portion 25, the distance between the upper walls 25c is set to be shorter than the distance between the lower walls 25a. Thereby, the volume reduction amount of the mass member 20 by the 2nd recessed part 25 can be decreased, and the mass reduction of the mass member 20 by the 2nd recessed part 25 can be prevented.

  In the present embodiment, the second bent portion 15 (see FIG. 3) of the bracket member 10 faces the lower wall 25a of the second recessed portion 25, and the inner wall 25b of the second recessed portion 25 is bracketed. The extending portion 12 of the member 10 is opposed to the side wall 25d of the second recessed portion 25, and the first bent portion 13 of the bracket member 10 is opposed to the side wall 25d.

  Next, with reference to FIG. 5, the relationship between the vibration isolating base 30, the buffer member 40, the bracket member 10, and the mass member 20 will be described. 5A is a plan view of the dynamic damper 1, FIG. 5B is a front view of the dynamic damper 1 as viewed in the direction of the arrow Vb in FIG. 5A, and FIG. It is a rear view of the dynamic damper 1 in the arrow Vc direction view of a).

  As shown in FIG. 5 (a), the buffer member 40 is composed of a rubber-like elastic material and covers a first buffer portion 41 that covers both ends of the opposing surface 21a of the mass member 20, and a first buffer portion 41. A second buffer portion 42 that is configured integrally and covers both ends of the back surface 21 b of the mass member 20, and a third buffer portion 43 that covers a substantially central portion of the opposing surface 21 a of the mass member 20 is provided. Has been. Thereby, even if the dynamic damper 1 connected to the steering wheel 70 (see FIG. 8) is largely displaced and collides with a member on the steering wheel 70 side, the first buffer portion 41 made of a rubber-like elastic material, Since the 2 buffer part 42 and the 3rd buffer part 43 intervene, generation | occurrence | production of abnormal noise can be suppressed.

  Further, as shown in FIGS. 5B and 5C, the first base 31 of the vibration-proof base 30 is opposed to the first connecting portion 14 of the bracket member 10 and the central recessed portion 24a of the mass member 20. The second base 32 of the vibration isolating base 30 connects the opposing faces of the second connecting portion 16 of the bracket member 10 and the first projecting portion 22 of the mass member 20. Thus, the height difference between the bottom surface of the first protrusion 22 to which the second base 32 is connected and the central recess 24a to which the first base 31 is connected (FIGS. 5B and 5C) in the vertical direction. Distance) can be increased. As a result, a resonance action for suppressing the vibration of the steering wheel 70 can be obtained in a wide frequency band.

  Further, as shown in FIG. 5A, the bracket member 10 has an opening 10 a formed by being surrounded by the attachment plate portion 11, the extending portion 12, the first bent portion 13, and the first connecting portion 14. The mass member 20 includes a second recessed portion 25 that is recessed from the bottom surface 21c to the back surface 21b. As a result, the distance between the side surface 25d of the second recessed portion 25 and the mounting plate portion 11 can be secured in the plan view shown in FIG. Thus, when the vibration isolator base 30 is molded by assembling the bracket member 10 and the mass member 20 to the mold 60 (see FIG. 7), the mold is closed in the directions of the arrows IIIb and IIIc using the opening 10a. It is possible to improve the workability of molding the vibration isolating substrate 30.

  Next, the anti-vibration base 30 and the buffer member 40 will be described in detail with reference to FIG. 6A is a sectional end view of the dynamic damper 1 taken along the line VIa-VIa in FIG. 5B, and FIG. 6B is a sectional end face of the dynamic damper 1 taken along the line VIb-VIb in FIG. 5B. FIG. In FIG. 6, illustration of each part of the bracket member 10 to which the anti-vibration base 30 is not connected is omitted.

  As shown in FIG. 6A, the first base 31 is formed integrally with the third buffer portion 43, and the first recessed portion 24 and the opposing surface 21a of the mass member 20 are covered with a rubber-like elastic material. ing. Thereby, the shaping | molding of the 1st base | substrate 31 and the adhesion | attachment to the mass member 20 of the 3rd buffer part 43 can be performed simultaneously, A manufacturing process can be simplified and productivity can be improved.

  Moreover, the connection structure of the mass member 20 and the 1st connection part 14 is integrally connected with the 1st rubber | gum connection part 31a which covers the 1st recessed part 24 of the mass member 20, and the 1st rubber | gum connection part 31a. The first base 31 and a rubber-like elastic material integral with the first base 31, and projecting to the outside in the radial direction of the first through hole 14 b (one surface of the first connecting portion 14 (the mass member 20 and The first overhanging portion 32 is formed on the opposite surface) side, a rubber-like elastic material integral with the first overhanging portion 32, and is narrowed in the radial direction of the first through hole 14b. The first through-hole 33 b is inserted into the first through-hole 14 b, and is formed of a rubber-like elastic material integral with the first through-hole 33, and is positioned on the opposite side of the first connecting portion 14. The 2nd overhang | projection formed by overhanging from the 1st penetration part 33 to the outer side of the radial direction of 1 through-hole 14b It is constituted by a 34.

  Thereby, the 1st overhang | projection part 32 cannot pass the 1st through-hole 14b, and the movement of the 1st base | substrate 31 to the opposite side to the bracket member 10 is controlled. As a result, the bracket member 10 and the first base 31 are not vulcanized and bonded, or the bracket member 10 and the first base 31 are bonded to the bracket 10 and the first base 31 even if the amount of adhesive applied to the bracket member 10 and the first base 31 is small. It becomes possible to connect one base 31. Thereby, the omission of the adhesive application process and the amount of adhesive applied can be reduced.

  In addition, since the first projecting portion 32 is formed so as to project to the outside in the radial direction of the first through hole 14b, the thickness of the first substrate 31 in the direction orthogonal to the column direction of the first substrate 31 is set. Regardless of the inner diameter of the first through hole 14b, the resonance frequency, the strength of the first base 31 and the like can be set freely.

  As shown in FIG. 6B, the second base 32 is formed integrally with the first buffer portion 41 and the second buffer portion 42, and the bottom surface 21c of the mass member 20 (first protrusion 22) is rubber-like. Covered with elastic material. Thereby, shaping | molding of the 2nd base | substrate 32 and adhesion | attachment to the mass member 20 of the 1st buffer part 41 and the 2nd buffer part 42 can be performed simultaneously, A manufacturing process can be simplified and productivity can be improved.

  Moreover, the connection structure of the mass member 20 and the 2nd connection part 16 is integrated with the 2nd rubber connection part 35a which covers the bottom face 21c of the 1st protrusion part 22 of the mass member 20, and the 2nd rubber connection part 35a. The second base 35 is connected to the second base 35 and a rubber-like elastic material integral with the second base 35, and extends to the outside in the radial direction of the second through hole 16b. The first overhanging portion 36 formed on the side facing the member 20, and a rubber-like elastic material integral with the first overhanging portion 36 and narrowed in the radial direction of the second through hole 16 b. The second through-hole 37b is inserted into the second through-hole 16b while being formed of a rubber-like elastic material integrated with the second through-hole 37, and on the opposite side of the second connecting portion 16. It is formed by projecting from the second penetration part 37 to the outside in the radial direction of the second through hole 16b. It is configured to include a second projecting portion 38 that.

  As a result, the first overhang portion 36 cannot pass through the second through hole 16b, and the movement of the second base 35 to the opposite side of the bracket member 10 is restricted. As a result, the bracket member 10 and the second base 35 are not vulcanized and bonded, or the bracket member 10 and the second base 35 are bonded to the bracket 10 and the second base 35 even if the amount of adhesive applied to the bracket member 10 and the second base 35 is small. The two substrates 35 can be connected. Thereby, the omission of the adhesive application process and the amount of adhesive applied can be reduced.

  Further, since the first projecting portion 36 is formed so as to project to the outside in the radial direction of the second through-hole 16b, the thickness of the second substrate 35 in the direction orthogonal to the column direction of the second substrate 35 is set. Regardless of the inner diameter of the second through-hole 16b, it can be set freely in consideration of the resonance frequency, the strength of the second base 35, and the like.

  Next, with reference to FIG. 7, the manufacturing method of the dynamic damper 1 comprised as mentioned above is demonstrated. FIG. 7 is a cross-sectional view of the mold 60 in which the bracket member 10 and the mass member 20 are assembled. In FIG. 7, the second connecting portion 16 and the mass member 20 (main body portion 21) connected by the second base 35 will be illustrated and described. In order to mold the vibration-proof base 30, as shown in FIG. 7, the mass member 20 is fixed to the first mold, and the bottom surface 21c of the mass member 20 and the one surface side of the first connecting portion 16 are spaced apart from each other by a predetermined distance. Using the first protrusion 14a, the second protrusion 16a, and the pin insertion hole 11b (see FIG. 3A) of the bracket member 10 so as to be opposed to each other, the bracket member 10 is attached to the first mold 61. Fix it.

  Next, the second mold 62 and the third mold 63 are used to close the mold in the left-right direction in FIG. 7 (the arrow Vb direction or the arrow Vc direction in FIG. 5A) to form the cavity 66. Next, a rubber-like elastic material is injected into the second through hole 16 b and the cavity 66 from the supply path 64 of the mold 60 through the gate 65. Accordingly, the first buffer portion 41, the second buffer portion 42, the second rubber connecting portion 35a, the second base body 35, the first overhang portion 36, the second penetration portion 37, and the second overhang portion 38 (FIG. 6). (B) is formed. The first buffer 41 and the second buffer 42 and the mass member 20 are vulcanized and bonded. After the rubber-like elastic material is cured, it is released from the mold, and the rubber-like elastic material is cut in the vicinity of the gate 65 located on the other surface side of the bracket member 10. A connected dynamic damper 1 is obtained.

  As described above, the cut mark for cutting the cured rubber-like elastic material is formed on the other surface side of the bracket member 10. The load of the mass member 20 is a load of the vibration isolation base 30 that connects the mass member 20 and one surface side of the bracket member 10 (the surface facing the mass member 20), but is formed on the other surface side of the bracket member 10. Since it does not become a load of the cut trace that has been made, the cut trace is unlikely to be the starting point of the crack of the vibration-proof substrate 30, and even if a crack occurs in the vibration-proof substrate 30 starting from the cut mark, it is difficult to grow the crack. Therefore, the durability of the dynamic damper 1 can be improved. In addition, since the cut trace is unlikely to become the starting point of the crack of the vibration-proof substrate 30, a finishing process that prevents the cut trace from being left can be eliminated, and productivity can be improved.

  In addition, an adhesive that bonds the first buffer portion 41 and the second buffer portion 42 to the mass member 20 is necessary, but the first overhang portion 36 and the second overhang portion 38 sandwiching the second connecting portion 16. (See FIG. 6B), the second connecting portion 16 and the rubber-like elastic material are vulcanized and bonded, or the second connecting portion 16 and the rubber-like elastic material are vulcanized and bonded. Even if the application amount of the adhesive is small, it is possible to connect the second connecting portion 16 and the vibration isolation base 30. Thereby, the application quantity of an adhesive agent can be reduced.

  Further, a parting line is set on the vibration-proof base 30 by closing the mold in the left-right direction in FIG. 7 (the direction of the arrow Vb or the direction of the arrow Vc in FIG. 5) by the second mold 62 and the third mold 63. The mold structure can be simplified.

  Next, with reference to FIG. 8, the connection structure to the steering wheel 70 of the dynamic damper 1 comprised as mentioned above is demonstrated. FIG. 8 is a schematic view of the dynamic damper 1 showing a state where it is connected to the steering wheel 70.

  The dynamic damper 1 is attached to a boss portion 74 in the lower cover 71. The boss portion 74 is a member through which the steering shaft 72 is penetrated and fixed to the spoke 73. Although the distance between the boss 74 and the lower cover 71 is narrow, the opposing surface 21a of the main body 21 of the mass member 20 is curved in a convex shape, so that the mass member 20 is moved along the curved surface of the lower cover 71. Can be placed. Even if the steering wheel 70 is greatly displaced due to traveling on a rough road and the mass member 20 collides with the lower cover 71, the first buffer portion 41 and the third buffer portion 43 made of rubber-like elastic material are interposed. , Generation of abnormal noise can be suppressed. Moreover, even if the mass member 20 collides with the boss portion 74, since the second buffer portion 42 made of a rubber-like elastic material is interposed, generation of abnormal noise can be suppressed.

  As described above, the present invention has been described based on the embodiments, but the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. It can be easily guessed.

  For example, the numerical values (for example, the number and size of each component) given in the above embodiment are merely examples, and other numerical values can naturally be adopted.

  In the above-described embodiment, the case where the attachment plate portion 11 of the bracket member 10 includes the extended portion 12 has been described. However, the present invention is not necessarily limited to this, and the extended portion 12 can be omitted. . In this case, instead of the extended portion 12, the connecting portion of the first connecting portion 14 with the first bent portion 13 is formed long so as to ensure the facing surfaces of the bracket member and the mass member.

  In the said embodiment, although the case where the length of the 2nd bending part 15 was set short compared with the length of the 1st bending part 13 of the bracket member 10, it is not necessarily restricted to this, It is also possible to set the length of the first bent portion 13 to be longer than the length of the second bent portion 15 according to the peak frequency of vibration of the steering wheel 70 or the like. In this case, the shape of the mass member 20 is appropriately set according to the shape of the bracket member 10.

  In the above-described embodiment, the case where the facing surface 21a of the mass member 20 is configured to protrude convexly is described. However, the shape is not limited to this shape, and may be a substantially rectangular parallelepiped shape. .

  In the above embodiment, the case where the mass member 20 includes the first projecting portion 22 and the second projecting portion 23 has been described. However, the mass of the mass member 20 is reduced in relation to the peak frequency of vibration of the steering wheel 70. If necessary, the first protrusion 22 and the second protrusion 23 may not be provided.

  In the above embodiment, the case where the buffer member 40 includes the first buffer part 41 and the third buffer part 43 separately has been described. However, the present invention is not necessarily limited to this, and the first buffer part 41 and the third buffer part are not necessarily limited thereto. It is also possible to attach the unit 43 and the unit 43 to the facing surface 21 a of the mass member 20.

  In the above embodiment, the case where the buffer member 40 is made of a rubber-like elastic material has been described. However, the present invention is not necessarily limited to this. The buffer member 40 is formed of felt or the like, and the mass after the vibration-proof substrate 30 is formed. It is also possible to stick to the member 20.

  Although the case where the dynamic damper 1 is attached to the boss portion 74 in the lower cover 71 has been described in the above embodiment, the dynamic damper 1 may be attached to the spoke 73.

  In the above embodiment, the case where the supply path 64 and the gate 65 are divided and configured by the second mold 62 and the third mold 63 in the mold 60 (see FIG. 7) for injecting the rubber-like elastic material will be described. However, it is not necessarily limited to this. It is also possible to form the supply path 64 and the gate 65 with a single mold without dividing. In this case, the height (the vertical direction in FIG. 7) of the second mold 62 and the third mold 63 is set to one surface side (the lower side in FIG. 7) of the second connecting portion 16, and the supply path 64 is formed on the upper surface thereof. Then, a mold having a cavity for the gate 65 and the second overhanging portion 38 is mounted. By injecting the rubber-like elastic material from the supply path 64, the first buffer portion 41, the second buffer portion 42, the second rubber connecting portion 35a, the second base 35, the first overhang portion 36, and the second penetration portion. 37 and the 2nd overhang | projection part 38 (refer FIG.6 (b)) are formed. Thereby, the mold closing force of the second mold 62 and the third mold 63 can be reduced, and productivity can be improved.

  In the above-described embodiment, vulcanization adhesion between the first overhanging portion 32 (see FIG. 6), the first through-hole 33, the second overhanging portion 34, and the first connecting portion 14 is not necessarily required. Further, vulcanization adhesion between the first overhanging portion 36, the second through-hole 37, the second overhanging portion 38, and the second connecting portion 16 is not necessarily required. However, by vulcanizing and bonding the first overhanging portion 32 and the second overhanging portion 34 and the first connecting portion 14, and by vulcanizing and bonding the first through-hole portion 33 and the first through hole 14b, Compared with the case where the first overhanging portion 32 and the first connecting portion 14 are vulcanized and bonded, the bonding area can be expanded. Also, by vulcanizing and bonding the first overhanging portion 36 and the second overhanging portion 38 and the second connecting portion 16, and by vulcanizing and bonding the second through-hole portion 37 and the second through hole 16 b, Compared with the case where the first overhang portion 36 and the second overhang portion 38 are vulcanized and bonded, the bonding area can be increased. Thereby, the adhesive strength between the bracket member 10 and the vibration isolating base 30 can be remarkably improved.

DESCRIPTION OF SYMBOLS 1 Dynamic damper 10 Bracket member 11 Mounting plate part 12 Extension part (a part of mounting plate part)
15 2nd bending part (folding part)
16 2nd connection part (connection part)
14b First through hole (through hole)
16b Second through hole (through hole)
20 Mass member 21 Body portion 21a Opposing surface 21c Bottom surface 25 Second recessed portion (concave portion)
25a Lower wall (inner wall)
30 Anti-vibration base 33 First penetration (penetration)
37 Second penetration part (penetration part)
34,38 Second overhang (overhang)
40 Buffer member 70 Steering wheel

Claims (3)

A bracket member coupled to the steering wheel;
A plurality of through holes formed through a plurality of locations of the bracket member;
A mass member functioning as a mass body;
A plurality of vibration-proof bases configured to connect the opposing surfaces of the mass member and the one surface side of the bracket member at the position of the through hole and are made of a rubber-like elastic material ,
The mass member is
A main body portion in which a curved facing surface facing a member on the steering wheel side is formed horizontally long;
From the bottom surface that intersects the opposing surface of the main body part, and a concave part that is opposed to each other and has an inner wall along the short direction of the main body part,
The bracket member is
An attachment plate portion attached to the steering wheel;
A pair of bent portions facing the inner wall of the recessed portion while being bent from both side edges of the mounting plate portion;
A dynamic damper comprising: a pair of connecting portions that are bent in a direction parallel to the mounting plate portion from the pair of bent portions and to which the vibration-proof base is connected . A rubber-like elastic material that is integral with the vibration-proof substrate, and a through-hole that is formed in the through-hole while being narrowed in the radial direction of the through-hole;
A projecting portion formed of a rubber-like elastic material integral with the penetrating portion and formed to project from the penetrating portion to the outer side in the radial direction of the through hole located on the opposite surface side of the bracket member; The dynamic damper according to claim 1, further comprising: A cushioning member that is bonded to at least a part of the facing surface of the mass member facing the steering wheel side member;
The dynamic damper according to claim 1, wherein the buffer member is made of a rubber-like elastic material integrated with the vibration-proof base.

Images