JP5185045B2 - Mold for molding, and method for manufacturing dynamic damper - Google Patents

Description

  The present invention relates to a molding die and a method for manufacturing a dynamic damper using the same.

Conventionally, a dynamic damper that attenuates vibrations of a vibration source such as a vehicle is known. The dynamic damper shown in Patent Literatures 1 to 3 includes a weight, a plate fitting attached to a vibration source, and a rubber elastic body that connects the weight and the plate fitting to each other.
JP-A-1-316539 JP-A-8-247213 JP-A-8-135732

  Examples of the dynamic damper as described above include the following. That is, as shown in FIG. 12, the weight 111 includes rectangular first and second bottom surfaces 111 a and 111 b that face each other, and a short side direction (hereinafter referred to as a weight short side direction) of the bottom surfaces 111 a and 111 b, respectively. First and second side surfaces 111c extending in parallel and facing each other (second side surface not shown) and third and third surfaces extending in parallel with the long side direction of the bottom surface (hereinafter referred to as the weight long side direction) and facing each other, respectively. It has a rectangular parallelepiped shape having a fourth side surface 111e (the fourth side surface is not shown). As shown in FIG. 13, the plate fitting 112 is formed with a rubber injection hole (not shown) for injecting rubber at a portion facing the first bottom surface 111 a of the weight 111 and facing the central portion of the first bottom surface 111 a. The bottom wall 112a is provided. As shown in FIGS. 12 to 14, the rubber elastic body 113 includes a covering portion 113 a that covers the outer surface of the weight 111, a connecting portion that connects the first bottom surface 111 a of the weight 111 and the bottom wall portion 112 a of the plate fitting 112. 113b and the filling part 113c which fills the rubber injection hole of the plate metal fitting 112. The dynamic damper 110 is manufactured by integrally forming a rubber elastic body 113 on the weight 111 and the plate fitting 112 using a molding die (not shown).

  Here, the first and second side surfaces 111c of the weight 111 each extend in parallel with the weight short side direction, while the third and fourth side surfaces 111e each extend in parallel with the weight long side direction. The distance from the center of 111a through the first or second side surface 111c to the center of the second bottom surface 111b passes from the center of the first bottom surface 111a of the weight 111 through the third or fourth side surface 111e. It is longer than the distance to the center of the second bottom surface 111b.

  Therefore, in the molding of the dynamic damper 110, the rubber material flowing between the first or second side surface 111c of the weight 110 and the molding die is the third or fourth side surface 111e of the weight 111 and the molding metal. It is slower to reach between the second bottom surface 111b of the weight 111 and the molding die than the rubber material flowing between the molds. Due to the difference in the arrival time of the rubber material, a relatively long and large air pocket (air pocket) extending in the long side direction of the weight can be formed in the portion covering the second bottom surface 111b of the weight 111 in the covering portion 113a of the rubber elastic body 113. This portion becomes the lacking wall 113c. This lack of meat 113c may deteriorate the appearance of the dynamic damper 110. In particular, when a material symbol, a logo mark, a cavity number, a manufacturing date indication mark, or the like is engraved on a portion of the covering portion 113a that covers the second bottom surface 111b of the weight 111, the engraving is lost due to the lacking wall 113c. The damper 110 may become defective. In addition, the arrow of FIG. 12 has shown the flow of the rubber material.

  This invention is made | formed in view of this point, The place made into the objective is to improve the appearance of a dynamic damper in the metal mold | die for shaping | molding, and the manufacturing method of a dynamic damper using the same.

  According to a first aspect of the present invention, there are provided first and second rectangular bottom surfaces that face each other, first and second side surfaces that extend parallel to the short side direction of the bottom surface and face each other, and long side directions of the bottom surface, respectively. A rectangular parallelepiped weight extending in parallel and having third and fourth side surfaces facing each other, and rubber injection for injecting rubber into a portion facing the first bottom surface of the weight and facing the center of the first bottom surface A rubber elastic body having a plate fitting having a bottom wall portion in which a hole is formed, a covering portion covering the outer surface of the weight, and a connecting portion for connecting the first bottom surface of the weight and the bottom wall portion of the plate fitting to each other. A molding die for vulcanizing and integrally molding the rubber elastic body on the weight and plate metal fitting, and a third of the weight is formed on the inner surface of the molding die. And the fourth side It is characterized in that the protrusions are formed in a portion opposite to the long side direction central portion.

  As a result, a convex portion is formed on the inner surface of the molding die on the third and fourth side surfaces of the weight opposite to the central portion of the weight bottom surface (hereinafter referred to as the weight long side direction). Therefore, when a rubber elastic body is vulcanized and integrally formed on the weight and the plate metal fitting using such a molding die, the weight long side center portion of the third or fourth side surface of the weight, the molding die, The rubber material flowing between them is blocked by the convex part and flows around the convex part. And the rubber material which detoured the convex part merges with the rubber material which has flowed between the 1st or 2nd side surface of a weight, and the metal mold | die for shaping | molding. As described above, there is almost no rubber material that passes between the weight long side central portion of the third or fourth side surface of the weight and the molding die and directly reaches between the second bottom surface and the molding die. The thin portion formed in the portion covering the second bottom surface of the weight in the covering portion of the rubber elastic body is made relatively short and small formed in the center portion in the weight long side direction of the portion covering the second bottom surface. it can. Therefore, the appearance of the dynamic damper can be improved.

  According to a second aspect of the present invention, in the first aspect of the invention, the inner surface of the molding die is marked on a portion of the covering portion that faces the second bottom surface of the weight, on a portion that covers the second bottom surface. For this purpose, a stamped portion is formed.

  As described above, the thin portion formed in the portion covering the second bottom surface of the weight in the covering portion of the rubber elastic body is relatively short and small, formed in the center portion in the weight long side direction of the portion covering the second bottom surface. Therefore, even when marking on the portion covering the second bottom surface as in the present invention, it is possible to prevent the dynamic damper from being defective due to lack of the marking.

  According to a third aspect of the present invention, in the first or second aspect of the invention, the convex portion is formed on a portion of the inner surface of the molding die that faces the second bottom surface side end portions of the third and fourth side surfaces of the weight. Each is formed.

  By the way, when the convex portion is formed on each of the inner surfaces of the molding die at portions facing the portions other than the end portions on the second bottom surface side of the third and fourth side surfaces of the weight, the rubber material bypassing the convex portion is obtained. The third and fourth side surfaces of the weight in the covering portion of the rubber elastic body are covered without rotating between the lower portion of the portion corresponding to the convex portion on the third and fourth side surfaces of the weight and the molding die. There is a possibility that a portion of the portion corresponding to the convex portion is undercut.

  Here, according to the present invention, the convex portions are formed on the inner surface of the molding die on the portions facing the second bottom surface side end portions of the third and fourth side surfaces of the weight. It is possible to suppress such a lack of meat.

  According to a fourth aspect of the present invention, there are provided first and second rectangular bottom surfaces that face each other, first and second side surfaces that extend in parallel to the short side direction of the bottom surface and face each other, and long side directions of the bottom surface, respectively. A rectangular parallelepiped weight extending in parallel and having third and fourth side surfaces facing each other, and rubber injection for injecting rubber into a portion facing the first bottom surface of the weight and facing the center of the first bottom surface A rubber elastic body having a plate fitting having a bottom wall portion in which a hole is formed, a covering portion covering the outer surface of the weight, and a connecting portion for connecting the first bottom surface of the weight and the bottom wall portion of the plate fitting to each other. A method of manufacturing a dynamic damper, comprising: an inner surface of a molding die for integrally vulcanizing and molding the rubber elastic body on the weight and the plate metal, on the third and fourth side surfaces of the weight. Above long side A convex portion is formed in a portion facing the central portion in the direction, and the rubber elastic body is vulcanized and integrally formed on the weight and the plate metal fitting using the molding die. is there.

  Thereby, the same effect as that of the first invention can be obtained.

  According to the present invention, since the convex portions are respectively formed on the inner surface of the molding die at the portions facing the weight long side direction central portions of the third and fourth side surfaces of the weight, When a rubber elastic body is vulcanized and integrally formed on a weight and a plate fitting using a mold, the rubber material that has flowed between the central portion of the weight in the long side direction of the third or fourth side surface of the weight and the molding die Is blocked by the convex part and flows around the convex part. And the rubber material which detoured the convex part merges with the rubber material which has flowed between the 1st or 2nd side surface of a weight, and the metal mold | die for shaping | molding. As described above, there is almost no rubber material that passes between the weight long side central portion of the third or fourth side surface of the weight and the molding die and directly reaches between the second bottom surface and the molding die. The thin portion formed in the portion covering the second bottom surface of the weight in the covering portion of the rubber elastic body is made relatively short and small formed in the center portion in the weight long side direction of the portion covering the second bottom surface. it can. Therefore, the appearance of the dynamic damper can be improved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

-Dynamic damper configuration-
The configuration of the dynamic damper according to the embodiment of the present invention will be described below.

  As shown in FIGS. 1 to 3, the dynamic damper 10 includes a weight 11 (only FIG. 3 is shown in FIGS. 1 to 3), a plate fitting 12, and the weight 11 and the plate fitting 12. And a rubber elastic body 13.

  As shown in FIG. 3, the weight 11 includes rectangular first and second bottom surfaces 11 a and 11 b that are opposed to each other (see also FIGS. 8 to 10. In FIG. 3, the first bottom surface 11 a is the bottom surface and the second bottom surface 11 b. Is a rectangular first shape and a second shape that extend parallel to the short side direction of the bottom surface 11a, 11b of the weight 11 (hereinafter referred to as the weight short side direction) and face each other. A third rectangular shape that extends in parallel with the side surface 11c (see FIG. 10; the second side surface is not shown) and the long side direction of the bottom surface 11a, 11b of the weight 11 (hereinafter referred to as the weight long side direction) and faces each other. And a rectangular parallelepiped metal mass member having fourth side surfaces 11e and 11f (see also FIGS. 8 to 10).

  As shown in FIGS. 1 to 4, the plate fitting 12 is a bracket member having a bottom wall portion 12 a that faces the first bottom surface 11 a of the weight 11 with a predetermined interval. In the bottom wall portion 12a, a circular rubber injection hole 12b for injecting rubber that penetrates in the thickness direction in a portion facing the center portion of the first bottom surface 11a of the weight 11 (only FIG. 4 in FIGS. 1 to 4). (Shown) is formed. That is, the rubber injection hole 12 b is disposed on the back side of the second bottom surface 11 b of the weight 11. A pair of branch parts 12c and 12c are formed in the bottom wall part 12a by bifurcating on one side in the weight short side direction. An insertion hole 12d for inserting a fastener is formed in the vicinity of the center of the branch portion 12c. The branching portion 12d is fastened and fixed to the vibration source of the vehicle by a fastener (not shown) inserted through the insertion hole 12d, so that the dynamic damper 10 is attached to the vibration source and attenuates the vibration of the vibration source. It has become.

  As shown in FIGS. 1 to 3, the rubber elastic body 13 includes a weight 11 rust prevention covering portion 13 a that covers the entire outer surface of the weight 11, a first bottom surface 11 a of the weight 11, and a bottom wall portion 12 a of the plate fitting 12. And a filling portion 13c (see FIGS. 9 to 11) for filling the rubber injection hole 12b of the plate fitting 12.

  A material symbol 13e (in the present embodiment, “> NR + SBR <”) or a logo mark 13f (in the present embodiment) is formed on a portion of the covering portion 13a that covers the entire second bottom surface 11b of the weight 11 (hereinafter referred to as an engraved portion 13d). , “○ ××××”), cavity number 13g (“1-1” in this embodiment), and manufacturing date indication mark 13h (“890123” in this embodiment) are engraved. The material symbol 13e is in the upper left of FIG. 2 in the stamp forming portion 13d, the logo 13f is in the upper right of FIG. 2 in the stamp forming portion 13d, and the cavity number 13g is in the lower left of FIG. 2 in the stamp forming portion 13d. The marks 13h are arranged at the lower left and lower right in FIG. As described above, the raised patterns 13e to 13h are formed in portions other than the central portion in the weight long side direction in the marking forming portion 13d.

  A relatively short and small cut 13i is formed at both ends of the weight in the short side direction at the center portion of the weight forming side 13d of the marking forming portion 13d (in FIGS. The illustration of the meat 13i is omitted (only FIG. 11 is shown). Details of the lack 13i will be described later. Concave portions 13j are formed at the four corners of the stamp forming portion 13d. In the portion covering the entire third and fourth side surfaces 11e and 11f of the weight 11 in the covering portion 13a, the end portion on the second bottom surface 11b side (the upper end portion in FIGS. 1 to 3) is in the middle portion in the weight long side direction. Recesses 13k that are rectangular in a side view are formed.

-Configuration of mold for molding-
Hereinafter, the configuration of the molding die will be described.

  As shown in FIGS. 5 to 9, the molding die 20 includes an upper die 21, a lower die 22, and a middle die 23 disposed between the upper die 21 and the lower die 22.

  The upper die 21 is formed with a rubber injection passage 21a for injecting rubber at a portion facing the rubber injection hole 12b of the bottom wall portion 12a of the plate fitting 12 when the die is closed.

  On the upper surface of the lower die 22, a concave portion 22 a having a rectangular shape in plan view for forming the covering portion 13 a of the rubber elastic body 13 together with the middle die 23 is formed. The inner surface of the recess 22a includes a rectangular bottom surface 22b, rectangular first and second side surfaces 22c and 22d extending in parallel with the short side direction of the bottom surface 22b and facing each other, and the long side direction of the bottom surface 22b. The rectangular third and fourth side surfaces 22e and 22f extend in parallel with each other and face each other. In the recess 22a, the weight 11 is set across the middle mold 23 when the mold is closed. The bottom surface 22b faces the second bottom surface 11b of the weight 11 at a predetermined interval when the mold is closed. The first to fourth side surfaces 22c to 22f respectively oppose the first to fourth side surfaces 11c, 11e, and 11f of the weight 11 with a predetermined interval when the mold is closed.

  A portion of the inner surface of the lower mold 22 facing the second bottom surface 11b of the weight 11 when the mold is closed, that is, the bottom surface 22b of the recess 22a has a raised pattern on the marking forming portion 13d of the covering portion 13a of the rubber elastic body 13. A marking recess (a marking portion) for marking is formed. The marking recess includes a material symbol marking recess 22g disposed on the upper right side of FIG. 6 on the bottom surface 22b of the recess 22a, and a logo mark marking recess 22h disposed on the upper left side of FIG. 6 on the bottom surface 22b of the recess 22a, The cavity number marking recess 22i disposed at the lower right of FIG. 6 on the bottom surface 22b of the recess 22a, and the manufacturing date indicating mark marking recess 22j disposed at the lower right and lower left of FIG. 6 on the bottom surface 22b of the recess 22a. And are included. Thus, the marking recesses 22g to 22j are formed in portions other than the central portion in the long side direction on the bottom surface 22b of the recess 22a.

  At the four corners of the bottom surface 22b of the recess 22a, support portions 22k that support the four corners of the second bottom surface 11b of the weight 11 when the mold is closed and float the weight 11 from the bottom surface 22b of the recess 22a on the inner surface of the lower mold 22 are formed. .

  The portion of the inner surface of the lower die 22 that faces the central portion in the weight long side direction of the second bottom surface 11b side end portion (lower end portion in FIGS. 8 and 9) of the weight 11 third and fourth side surfaces 11e and 11f when the die is closed That is, in the central part in the long side direction of the lower side portion of the third and fourth side surfaces 22e and 22f of the concave portion 22a, there are third and second convex portions 22l that protrude toward the weight 11 when the mold is closed. The fourth side surfaces 22e and 22f are formed so as to extend in the long side direction.

  The middle mold 23 has a first hole 23a and a first hole 23a formed on the lower side of the first hole 23a so as to communicate with the first hole 23a. A rectangular shape in plan view for forming the covering portion 13a of the rubber elastic body 13 together with the lower mold 22 so as to communicate with the second hole portion 23b and the second hole portion 23b below the second hole portion 23b. A third hole 23c having a shape is formed. The plate fitting 12 is set in the first hole portion 23a when the molding die 20 is closed (hereinafter simply referred to as mold closing). The inner surface of the third hole portion 23c extends in parallel with the short side direction of the bottom surface 22b of the recess 22a of the lower mold 22, and faces the rectangular first and second side surfaces (not shown) facing each other. The recess 22a has rectangular third and fourth side surfaces 23e, 23f that extend in parallel with the long side direction of the bottom surface 22b and face each other. In the third hole 23c, the weight 11 is set across the lower mold 22 when the mold is closed. The first to fourth side surfaces 23e and 23f oppose the first to fourth side surfaces 11c, 11e, and 11f of the weight 11 with a predetermined interval, respectively, when the mold is closed.

-Dynamic damper molding method-
Hereinafter, a method for forming the dynamic damper 10 using the molding die 20 will be described.

  First, as shown in FIG. 8, the weight 11 and the plate fitting 12 are set in the molding die 20, and the molding die 20 is brought into a clamped state.

  Next, as shown in FIG. 9, the molding material (hereinafter referred to as the molding material) of the rubber elastic body 13 is inserted into the cavity 20a of the molding die 20 through the rubber injection passage 21a of the upper mold 21 and the rubber injection hole 12b of the plate fitting 12. The rubber elastic body 13 is vulcanized and integrally formed on the weight 11 and the plate fitting 12.

  As described above, since the central portion of the first bottom surface 11a of the weight 11 and the rubber injection hole 12b of the plate fitting 12 are opposed to each other, as shown in FIGS. The inserted rubber material first reaches between the central portion of the first bottom surface 11 a of the weight 11 and the rubber injection hole 12 b of the plate metal 12, and then from there the first bottom surface 11 a of the weight 11 and the bottom of the plate metal 12. It flows between the wall portion 12a and the side surfaces 11c, 11e, 11f of the weight 11 and the molding die 20, and finally the second bottom surface 11b of the weight 11 and the molding die. It settles between the mold 20. In addition, the arrow of FIG. 10 has shown the flow of the rubber material.

  Here, the first and second side surfaces 11c of the weight 11 extend in parallel with the weight short side direction, while the third and fourth side surfaces 11e and 11f extend in parallel with the weight long side direction. The distance from the central portion of the first bottom surface 11a to the central portion of the second bottom surface 11b through the first or second side surface 11c is from the central portion of the first bottom surface 11a of the weight 11 to the third or fourth side surface 11e, It is longer than the distance from 11f to the center of the second bottom surface 11b.

  For this reason, in the conventional ones as described above, the rubber material that has flowed between the first or second side surface of the weight and the molding die is the third or fourth side surface of the weight and the molding die. It is slower to reach between the second bottom surface of the weight and the molding die than the rubber material flowing between the two. Due to the difference in the arrival time of the rubber material, the central portion of the marking forming portion in the covering portion of the rubber elastic body, that is, the portion that is shaded with respect to the rubber injection hole in the covering portion, extends in the weight long side direction and is relatively long. Large air pockets (air pockets) were formed, and this part was missing. Due to this lack of thickness, the material symbol, the logo mark, the cavity number, and the manufacturing date indication mark in the marking forming part of the covering part of the rubber elastic body may be lost, and the dynamic damper may be defective.

  Therefore, in the present embodiment, the weight length of the third and fourth side surfaces 22e and 22f of the lower mold 22 recess 22a at the end of the weight 11 at the second bottom surface 11b side of the third and fourth side surfaces 11e and 11f when the mold is closed. Protrusions 22l projecting toward the weight 11 when the mold is closed are formed at portions facing the central portion in the side direction so as to extend in the weight long side direction.

  For this reason, the rubber material passing between the weight long side center part of the third or fourth side surface 11e, 11f of the weight 11 and the molding die 20 is blocked by the convex part 22l, and bypasses the convex part 22l. Flowing. The rubber material that bypasses the convex portion 22l joins the rubber material that has flowed between the third or fourth side surface 11e, 11f of the weight 11 and the molding die 20. As described above, the gap between the weight long side central portion of the third or fourth side surface 11e, 11f of the weight 11 and the molding die 20 is small, and the third or fourth side surface 11e, 11f of the weight 11 is reduced. Since there is almost no rubber material that passes between the center portion in the long side direction of the weight and the molding die 20 and reaches directly between the second bottom surface 11b and the molding die 20, as shown in FIG. The undercut 13i formed in the marking forming portion 13d of the covering portion 13a of the elastic body 13 can be made relatively short and small. Therefore, the appearance of the dynamic damper 10 can be improved. In FIG. 11, the raised patterns 13e to 13h are not shown in order to make the drawing easier to see.

  Further, as described above, since the underfill 13i can be made relatively short and small, the material symbol 13e, the logo mark 13f, the cavity number 13g, the stamped portion 13d of the covering portion 13a of the rubber elastic body 13, It is possible to prevent the dynamic damper 10 from being defective due to lack of the manufacturing date indication mark 13h.

  Furthermore, since the underfill 13i can be made relatively short and small, the exposed portion of the weight 11 can be made relatively small, and the rust prevention effect of the weight 11 of the covering portion 13a of the rubber elastic body 13 can be exhibited. can do.

  By the way, if the convex part 22l is formed in the part which opposes parts other than the 2nd bottom face 11b side edge part of the weight 11 3rd and 4th side surface 11e, 11f at the time of mold closing of the inner surface of the molding die 20, respectively. The rubber material that bypasses the convex portion 22l does not rotate between the lower portion of the portion corresponding to the convex portion 22l on the third and fourth side surfaces 11e and 11f of the weight 11 and the molding die 20, and the rubber material There is a possibility that a portion of the covering portion 13a of the elastic body 13 covering the third and fourth side surfaces 11e and 11f of the weight 11 may be thinned in a lower portion corresponding to the convex portion 22l.

  Here, according to the present embodiment, the convex portion 22l faces the end of the inner surface of the molding die 20 on the second bottom surface 11b side of the weight 11 third and fourth side surfaces 11e, 11f when the mold is closed. Since it forms in each part, it can suppress that such a thinning is made.

  After the vulcanization integrated molding, the molding die 20 is opened. Thus, the formation of the dynamic damper 10 is completed. Of the covering portion 13a of the rubber elastic body 13 in the dynamic damper 10 after the molding, the marking forming portion 13d has raised patterns 13e to 13h at positions corresponding to the marking concave portions 22g to 22j of the lower die 22. Recesses 13j are respectively formed at positions corresponding to the support portions 22k. Further, in the covering portion 13a of the rubber elastic body 13, a portion covering the third and fourth side surfaces 11e and 11f of the weight 11 is formed with a concave portion 13k at a position corresponding to the convex portion 22l of the lower mold 22, respectively. Yes.

(Other embodiments)
In the above embodiment, the convex portions 22l are respectively formed on the inner surface of the molding die 20 at the portions facing the second bottom surface 11b side end portions of the weight 11 third and fourth side surfaces 11e, 11f when the mold is closed. However, it may be formed in a portion facing the portion other than the end portion on the second bottom surface 11b side. For example, on the inner surface of the middle mold 23 facing the third and fourth side surfaces 11e, 11f of the weight 11 when the mold is closed, that is, the third and fourth side surfaces 23e, 23f of the third hole 23c of the middle mold 23. It may be formed. However, it is desirable to form in the part which opposes the edge part on the 2nd bottom face 11b side from a viewpoint of suppressing that a thin part is made. In addition, if it forms in the upper part of the 3rd and 4th side surface 22e, 22f of the lower mold | type 23 recessed part 22a, it will become impossible to remove the dynamic damper 10 from the lower mold | type 22. FIG.

  Moreover, in the said embodiment, although the 1st and 2nd side surface 11c of the weight 11 is made into the rectangular shape, you may make it into a square shape.

  The present invention is not limited to the embodiments, and can be implemented in various other forms without departing from the spirit or main features thereof.

  As described above, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. The scope of the present invention is defined by the claims, and is not limited by the specification. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  As described above, the molding die and the method for manufacturing a dynamic damper according to the present invention can be applied to uses for improving the appearance of the dynamic damper.

It is a perspective view of a dynamic damper concerning an embodiment of the present invention. It is a top view of a dynamic damper. It is a side view of a dynamic damper. It is a perspective view of a plate metal fitting. It is sectional drawing of the metal mold | die for shaping | molding. It is a top view of a lower mold. FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. 6. It is a figure which shows a part of shaping | molding process of the dynamic damper using a metal mold | die for shaping | molding. It is a figure which shows a part of shaping | molding process of the dynamic damper using a metal mold | die for shaping | molding. It is a fragmentary sectional view of a dynamic damper in the state where a plate metal fitting was removed for explaining a flow of rubber material. It is a perspective view of a dynamic damper in the state where a plate metal fitting was removed. It is a fragmentary sectional view of the conventional dynamic damper in the state where the plate metal fitting was removed for explaining the flow of rubber material. It is a perspective view of the conventional dynamic damper. It is a perspective view of the conventional dynamic damper of the state which excluded the plate metal fitting.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Dynamic damper 11 Weight 11a 1st bottom face 11b 2nd bottom face 11c 1st side face 11e 3rd side face 11f 4th side face 12 Plate metal fitting 12a Bottom wall part 12b Rubber injection hole 13 Rubber elastic body 13a Covering part 13b Connection part 13d Marking formation part 20 Molding die 22 Lower die 22g Engraved recess for material symbol (engraved part)
22h Engraved recess for logo mark (engraved part)
22i Cavity number stamping recess (marking part)
22j Stamping recess for stamping mark (date stamping)
22l convex part

Claims (4)

The rectangular first and second bottom surfaces facing each other, the first and second side surfaces extending parallel to the short side direction of the bottom surface, and the opposing first and second side surfaces extending parallel to the long side direction of the bottom surface and facing each other. A rectangular parallelepiped weight having third and fourth side surfaces, a bottom facing the first bottom surface of the weight, and having a rubber injection hole for injecting rubber at a portion facing the center of the first bottom surface A dynamic damper comprising: a plate fitting having a wall portion; a rubber elastic body having a covering portion covering the outer surface of the weight; and a connecting portion for connecting the first bottom surface of the weight and the bottom wall portion of the plate fitting to each other. A molding die for integrally vulcanizing and molding the rubber elastic body on the weight and the metal plate,
On the inner surface of the molding die, convex portions are respectively formed on portions of the third and fourth side surfaces of the weight facing the central portions in the long side direction. The molding die according to claim 1,
On the inner surface of the molding die, a marking portion for marking a portion of the covering portion that covers the second bottom surface is formed in a portion facing the second bottom surface of the weight. Mold for molding. In the molding die according to claim 1 or 2,
The said convex part is each formed in the part facing the 2nd bottom face side edge part of the 3rd and 4th side surface of the said weight of the inner surface of the said molding die, The molding die characterized by the above-mentioned. The rectangular first and second bottom surfaces facing each other, the first and second side surfaces extending parallel to the short side direction of the bottom surface, and the opposing first and second side surfaces extending parallel to the long side direction of the bottom surface and facing each other. A rectangular parallelepiped weight having third and fourth side surfaces, a bottom facing the first bottom surface of the weight, and having a rubber injection hole for injecting rubber at a portion facing the center of the first bottom surface A dynamic damper comprising: a plate fitting having a wall portion; a rubber elastic body having a covering portion covering the outer surface of the weight; and a connecting portion for connecting the first bottom surface of the weight and the bottom wall portion of the plate fitting to each other. A manufacturing method of
A convex portion is formed on the inner surface of the molding die for integrally vulcanizing and molding the rubber elastic body on the weight and the plate metal fitting on the third and fourth side surfaces of the weight facing the central portions in the long side direction. Each part is formed,
A method for producing a dynamic damper, characterized in that the rubber elastic body is integrally vulcanized and molded on the weight and plate metal fitting using the molding die.

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