JP4705899B2 - Dynamic damper and manufacturing method thereof - Google Patents

Description

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

  2. Description of the Related Art Conventionally, a dynamic damper is known that is attached to a vibration source side of a vehicle body or the like of a vehicle and attenuates the vibration on the vibration source side (see, for example, Patent Document 1).

For example, as shown in FIG. 10, the dynamic damper has an attachment having a main body portion 123 composed of a bottom wall portion 121 and a pair of side wall portions 122, 122 and a pair of attachment portions 124, 124 attached to the vibration source side. A member 102, a mass member 105 provided inside the main body 123 of the mounting member 102, each side wall 122 of the mounting member 102, and a surface of the mass member 105 facing each side wall 122 of the mounting member 102. A pair of rubber elastic bodies 104 and 104 to be connected is provided. A bolt insertion hole (not shown) is formed in the bottom wall portion 121 of the mounting member 102, and a through hole 105 a is formed in the mass member 105 so as to correspond to the bolt insertion hole. The bolt 106 is screwed into the welding nut 121a of the bottom wall 121 of the mounting member 102 in a state where the bolt 106 is inserted into the through hole 105a of the mass member 105 through the bolt insertion hole of the mounting member 102. According to this configuration, when the dynamic damper is disposed so that the vertical direction coincides with the vehicle longitudinal direction, the bolt 106 is caught in the through hole 105a of the mass member 105 even if the rubber elastic body 104 is cut off. Can be prevented from falling off.
Japanese Utility Model Publication No. 63-65506

  By the way, when a rubber elastic body is vulcanized and molded integrally with a certain member, it is necessary to raise the temperature of the member to the vulcanization temperature of the rubber. Therefore, in the dynamic damper, if each rubber elastic body 104 is vulcanized and molded integrally with a relatively large mass member 105, it takes a long time for the temperature of the mass member 105 to rise to the vulcanization temperature of the rubber. As a result, the vulcanization time becomes long.

  Further, in the dynamic damper described above, a structure that suppresses the mass member 105 from falling off by a relatively laborious operation of screwing the bolt 106 into the nut 121a is manufactured. End up.

  From the above, the dynamic damper has a problem that its manufacturing time becomes long.

  This invention is made | formed in view of this point, The place made into the objective is to shorten the manufacturing time in a dynamic damper and its manufacturing method.

A first invention is a dynamic damper that is attached to a vibration source side and attenuates vibrations on the vibration source side, and is an outer member that is attached to the vibration source side and includes a bottom wall portion and a pair of side wall portions. A bottom wall portion provided inside the outer member, facing the bottom wall portion of the outer member and having an opening, and a pair of side wall portions facing the both side wall portions of the outer member. An inner member, a pair of rubber elastic bodies that connect the opposite side walls of the outer member and the inner member, and a surface that is provided inside the inner member and faces the bottom wall of the inner member. A hole formed so as to correspond to the opening of the bottom wall portion, and a mass member caulked to each side wall portion of the inner member, and the bottom wall portion of the outer member includes a bottom wall portion of the inner member Insert into the hole of the mass member through the opening of Was claw portion is provided in a bottom wall portion of the outer member, cuts are formed to correspond to the opening of the bottom wall portion of the inner member, the claw portion of the bottom wall portion of the outer member The inner portion of the cut is bent inside the outer member .

  Thus, when each rubber elastic body is integrally vulcanized and molded with the outer member and the inner member using a mold, the outer member and the inner member are relatively small, and the temperature of the outer member and the inner member is increased by the rubber. The time taken to increase to the sulfur temperature can be made relatively short. For this reason, as compared with the case where each rubber elastic body is vulcanized and molded integrally with the mass member as described above, the vulcanization time can be shortened.

  Moreover, since the mass member is crimped by each side wall part of the inner member, the mass member can be fixed inside the inner member. For this reason, it can suppress that a mass member falls. Furthermore, since the claw portion inserted into the hole of the mass member is provided on the bottom wall portion of the outer member through the opening of the bottom wall portion of the inner member, the vertical direction of the dynamic damper is made to coincide with the vehicle longitudinal direction. When the rubber elastic body is cut, the claw portion is caught in the hole of the mass member even if the rubber elastic body is cut, so that the mass member can be prevented from falling off. Here, it is relatively easy to caulk the mass member at each side wall portion of the inner member, or to insert the claw portion of the bottom wall portion of the outer member into the hole of the mass member through the opening of the bottom wall portion of the inner member. Since the structure that suppresses the mass member from falling off is produced by the operation, the production time can be shortened as compared with the case where the bolt is screwed onto the nut as described above.

  From the above, the manufacturing time of the dynamic damper can be shortened.

Further , the claw portion is inserted into the hole of the mass member through the opening of the bottom wall portion of the inner member by a very simple operation of bending the inner portion of the cut of the bottom wall portion of the outer member inside the outer member. be able to. For this reason, the time for producing the structure which suppresses that a mass member falls off can be shortened further.

  Further, since the claw portion is provided integrally with the bottom wall portion of the outer member, it is not necessary to provide the claw portion separately from the outer member.

According to a second invention, in the first invention, each side wall portion of the inner member has a notch formed in a central portion in the front-rear direction, and both side portions in the front-rear direction of the notch constitute leg portions. The mass member has recesses formed at the four corners of the surface opposite to the surface facing the bottom wall portion of the inner member so as to correspond to the leg portions, and adjacent to each other in the front-rear direction. The portions between the recesses constitute stepped portions, respectively, and the stepped portions are caulked to the leg portions in the recessed portions so that the stepped portions are sandwiched between two leg portions adjacent to the stepped portion in the front-rear direction. It is characterized by being.

  Thereby, the mass member is caulked by each leg portion in each recess so that each step portion is sandwiched between two leg portions adjacent to the step portion in the front-rear direction. It can be fixed securely. For this reason, it can suppress reliably that a mass member falls.

According to a third invention, in the first or second invention, the length in the front-rear direction of the bottom wall portion of the inner member is the same as or longer than the length in the front-rear direction of the surface of the mass member facing the bottom wall portion. The notch is formed in both ends of the bottom wall portion of the inner member in the front-rear direction.

  Thereby, the front-rear direction length of the bottom wall part of the inner member is made equal to or shorter than the front-rear direction length of the surface of the mass member facing the bottom wall part of the inner member, and the front-rear direction of the bottom wall part of the inner member Since the notches are formed in the edge portions at both ends, the mass member can be pushed downward at a portion corresponding to each notch of the bottom wall portion of the inner member. For this reason, it is possible to easily inspect the caulking strength and the like.

A fourth invention, the first to third be any one of a method of manufacturing a dynamic damper according to the invention, the outer member and the inner member integrally with the respective rubber elastic body by using a mold Each of the inner member of the vulcanized molded body, the step of forming the vulcanized molded body by vulcanization molding, the step of providing the mass member inside the inner member of the vulcanized molded body, A step of caulking at the side wall portion, and a step of inserting the claw portion of the bottom wall portion of the outer member of the vulcanized molded body into the hole of the mass member through the opening of the bottom wall portion of the inner member. It is characterized by.

  Thus, a pair of rubber elastic bodies are integrally vulcanized with the outer member and the inner member using a mold, but the outer member and the inner member are relatively small, so the temperature of the outer member and the inner member is the temperature of the rubber. The time taken to increase to the vulcanization temperature can be made relatively short. For this reason, as compared with the case where each rubber elastic body is vulcanized and molded integrally with the mass member as described above, the vulcanization time can be shortened.

  Also, the mass member is caulked at each side wall portion of the inner member, and the claw portion of the bottom wall portion of the outer member is inserted into the hole of the mass member through the opening of the bottom wall portion of the inner member. Since the structure which suppresses that a mass member falls is produced by this, the production time can be shortened compared with the case where a bolt is screwed into a nut as mentioned above.

  From the above, the manufacturing time of the dynamic damper can be shortened.

  According to the present invention, when each rubber elastic body is vulcanized and molded integrally with the outer member and the inner member using the mold, the inner member and the outer member are relatively small, so the temperature of the inner member and the outer member is The time taken to rise to the vulcanization temperature of the rubber can be made relatively short, so that the vulcanization time can be shortened, and the mass member is caulked on each side wall portion of the inner member, A structure that prevents the mass member from falling off is produced by a relatively simple operation of inserting the claw portion of the bottom wall portion of the outer member into the hole of the mass member through the opening of the bottom wall portion of the inner member. Therefore, the manufacturing time can be shortened, and the manufacturing time of the dynamic damper can be shortened from the above.

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

  A dynamic damper 1 according to an embodiment of the present invention is a device that is attached to a vibration source side (not shown) such as a vehicle body of a vehicle and attenuates vibration on the vibration source side. As shown in FIGS. 1 and 2, the dynamic damper 1 is disposed, for example, such that the front-rear direction coincides with the vehicle vertical direction and the vertical direction coincides with the vehicle front-rear direction (see FIG. 1). The dynamic damper 1 includes a metal plate-like outer bracket 2 (outer member), a metal plate-like inner bracket 3 (inner member), a pair of rubber elastic bodies 4 and 4, and a metal weight 5 (mass). Member).

  As shown in FIGS. 1 to 4, the outer bracket 2 includes a bottom wall portion (upper wall portion) 21 and a pair of side wall portions 22, 22 extending downward from left and right end edges of the bottom wall portion 21. And a pair of mounting portions 24, 24 that extend from the lower end edges of the side wall portions 22, 22 outward in the left-right direction and are attached to the vibration source side. . The bottom wall portion 21 of the outer bracket 2 is provided with two claw portions 21a and 21a inserted into the through holes 5c of the weight 5 through the openings 31a of the bottom wall portion 31 of the inner bracket 3 (see FIG. 1 and FIG. 2). Specifically, an inverted S-shaped cut 21b is formed on the bottom wall portion 21 of the outer bracket 2 so as to correspond to the opening 31a of the bottom wall portion 31 of the inner bracket 3 (see FIGS. 3 and 4). The claw portion 21 a is formed by bending a portion surrounded by the cut line 21 b of the bottom wall portion 21 of the outer bracket 2 to the inside of the main body portion 23 of the outer bracket 2. Each claw portion 21 is not in contact with the opening 31 of the bottom wall portion 31 of the inner bracket 3 and the inner peripheral surface of the through hole 5c of the weight 5 at normal times. Thereby, even if the rubber elastic body 4 is cut, each claw portion 21a is caught in the through hole 5c of the weight 5, so that the weight 5 can be prevented from falling off. Each mounting portion 24 of the outer bracket 2 is formed with a bolt insertion hole 24a through which a bolt (not shown) is inserted.

  Further, the length in the front-rear direction of the outer bracket 2 is shorter than the length in the front-rear direction of the inner bracket 3, and the length in the vertical direction of the outer bracket 2 is in a state after caulking (details of this caulking will be described later). The length of the inner bracket 3 is longer than the length of the inner bracket 3, and the length of the main body 23 of the outer bracket 2 is longer than the length of the inner bracket 3.

  As shown in FIGS. 1, 2, 5, and 6, the inner bracket 3 is provided inside the main body 23 of the outer bracket 2, and is a bottom facing the bottom wall 21 of the outer bracket 2. A wall portion (upper wall portion) 31 and a pair of side wall portions 32, 32 that extend downward from the left and right end edges of the bottom wall portion 31 and face the opposite side wall portions 22, 22 of the outer bracket 2, respectively. It is a member having a substantially U-shaped cross section. The bottom wall portion 31 of the inner bracket 3 is curved downward (see FIG. 6B) in a state before caulking (see FIG. 6B), and is straight in a state after caulking (see FIG. 2B). . A substantially rectangular opening 31a penetrating in the thickness direction is formed in the bottom wall portion 31 of the inner bracket 3. Each side wall 32 of the inner bracket 3 is formed with a substantially trapezoidal notch 32a at the center in the front-rear direction, and both side portions in the front-rear direction of the notch 32a constitute leg portions 32b, 32b, respectively. The side portions in the front-rear direction of each leg 32b are inclined outward in the front-rear direction as they go downward (see FIG. 6C).

  Further, the length in the front-rear direction of the bottom wall portion 31 of the inner bracket 3 is shorter than the length in the front-rear direction of the upper surface of the weight 5 (that is, the surface facing the bottom wall portion 31 of the inner bracket 3 in the weight 5). The length of the inner bracket 3 in the vertical direction is longer than the length of the weight 5 in the state before caulking, and the length of the inner bracket 3 in the horizontal direction is longer than the length of the weight 5 in the horizontal direction. .

  Furthermore, substantially rectangular cutouts 31b are respectively formed in the center portions in the left-right direction of both end portions in the front-rear direction of the bottom wall portion 31 of the inner bracket 3. Here, as described above, the length in the front-rear direction of the bottom wall portion 31 of the inner bracket 3 is shorter than the length in the front-rear direction of the upper surface of the weight 5, so that the weight 5 is attached to the bottom wall portion 31 of the inner bracket 3. Can be pushed downward at a portion corresponding to each notch 31b. Thereby, it is possible to easily inspect the caulking strength and the like.

  As shown in FIGS. 1 and 2, the pair of rubber elastic bodies 4, 4 are connected to the opposite side wall portions 22, 32 of the outer bracket 2 and the inner bracket 3, respectively. 3 is integrally vulcanized and bonded.

  As shown in FIGS. 1, 2, 7, and 8, the weight 5 is a substantially rectangular parallelepiped member disposed inside the inner bracket 3. The weight 5 is caulked to each side wall portion 32 of the inner bracket 3. Specifically, the weights 5 correspond to the leg portions 32b of the side wall portions 32 of the inner bracket 3 at the four corners of the lower surface (that is, the surface opposite to the surface facing the bottom wall portion 31 of the inner bracket 3). Each of the recesses 5a is formed in the upper and lower portions, and the portion between the two recesses 5a and 5a adjacent in the front-rear direction forms a stepped portion 5b. The length in the front-rear direction of each stepped portion 5b is smaller than the length of the lower side of the notch 32a of each side wall portion 32 of the inner bracket 3 (see FIG. 6C) in the state before caulking. The weight 5 is caulked to each leg 32b in each recess 5a by curling each leg 32b of the inner bracket 3. Thereby, the weight 5 is fixed in the inner bracket 3, and the weight 5 can be prevented from falling off. Here, as described above, the side portions on the inner side in the front-rear direction of each leg 32b are inclined toward the outer side in the front-rear direction as they go downward, so that when each leg 32b is curled, the weight 5 stepped portions 5b are sandwiched between two stepped portions 32b and 32b adjacent to the stepped portion 5b in the front-rear direction.

  The weight 5 is formed with a substantially rectangular through-hole 5c penetrating in the thickness direction so as to correspond to the opening 31a of the bottom wall portion 31 of the inner bracket 3.

-Dynamic damper manufacturing method-
Hereinafter, a method of manufacturing the dynamic damper 1 will be described with reference to FIG.

  First, as shown in FIG. 9 (a), each rubber elastic body 4 is integrally vulcanized and molded with the outer bracket 2 and the inner bracket 3 using a mold (not shown), whereby a vulcanized molded body 1a. Form.

  Then, the weight 5 is fitted inside the inner bracket 3 of the vulcanized molded body 1a.

  Then, as shown in FIG. 9B, the weights 5 are curled by curling the leg portions 32b of the side wall portions 32 of the inner bracket 3 of the vulcanized molded body 1a using a caulking jig (not shown). Is caulked with each leg 32b of the inner bracket 3 in each recess 5a.

  Simultaneously with this caulking, each inner wall of the bottom wall portion 21 of the outer bracket 2 is bent by bending the inner portion of the cut 21b of the bottom wall portion 21 of the outer bracket 2 of the vulcanized molded body 1a to the inner side of the main body portion 23 of the outer bracket 2. The claw portion 21 a is inserted into the through hole 5 c of the weight 5 through the opening 31 a of the bottom wall portion 31 of the inner bracket 3.

  Thereafter, the vulcanized molded body 1 a supported by the weight 5 is squeezed inward at the side wall portions 22, 22 of the outer bracket 2.

  As described above, the dynamic damper 1 is manufactured.

-Effect-
As described above, according to the present embodiment, each rubber elastic body 4 is integrally vulcanized with the outer bracket 2 and the inner bracket 3 using a mold, but the outer bracket 2 and the inner bracket 3 are relatively small. The time required for the temperature of the outer bracket 2 and the inner bracket 3 to rise to the vulcanization temperature of the rubber can be made relatively short. For this reason, compared with the case where each rubber elastic body 4 is vulcanized and molded integrally with the weight 5 as described above, the vulcanization time can be shortened.

  Further, since the weight 5 is caulked by the side wall portions 32 of the inner bracket 3, the weight 5 can be fixed to the inner side of the inner bracket 3. For this reason, it is possible to suppress the weight 5 from falling off. Further, the bottom wall portion 21 of the outer bracket 2 is provided with a claw portion 21a inserted into the through hole 5c of the weight 5 through the opening 31a of the bottom wall portion 31 of the inner bracket 3, so that the dynamic damper 1 is moved up and down. In the case where the direction is aligned with the longitudinal direction of the vehicle, the claw portion 21a is caught in the through hole 5c of the weight 5 even if the rubber elastic body 4 is cut, so that the weight 5 can be prevented from falling off. Here, the weight 5 is caulked by each side wall portion 32 of the inner bracket 3, or the claw portion 21 a of the bottom wall portion 21 of the outer bracket 2 is passed through the opening 31 a of the bottom wall portion 31 of the inner bracket 3. Since the structure that suppresses the weight 5 from falling off is manufactured by a relatively simple operation of inserting into the 5c, the manufacturing time thereof is compared with the case where the bolt is screwed into the nut as described above. Can be shortened.

  From the above, the manufacturing time of the dynamic damper 1 can be shortened.

  Further, the claw portion 21a is passed through the opening 31a of the bottom wall portion 31 of the inner bracket 3 by a very simple operation of bending the inner portion of the cut 21b of the bottom wall portion 21 of the outer bracket 2 to the inner side of the outer bracket 2. The weight 5 can be inserted into the through hole 5c. For this reason, it is possible to further shorten the time for manufacturing the structure that suppresses the weight 5 from falling off.

  Further, since the claw portion 21 a is provided integrally with the bottom wall portion 21 of the outer bracket 2, it is not necessary to provide the claw portion 21 a separately from the outer bracket 2.

  Further, since the weight 5 is caulked by the leg portions 32b in the concave portions 5a so that each step portion 5b is sandwiched between the two leg portions 32b and 32b adjacent to the step portion 5b in the front-rear direction, the weight 5 Can be securely fixed to the inside of the inner bracket 3. For this reason, it is possible to reliably suppress the weight 5 from falling off.

  Further, the length of the bottom wall 31 of the inner bracket 3 in the front-rear direction is made shorter than the length of the upper surface of the weight 5, and notches 31 b are formed at both ends of the bottom wall 31 of the inner bracket 3 in the front-rear direction. Therefore, the weight 5 can be pushed downward at a portion corresponding to each notch 31 b of the bottom wall portion 31 of the inner bracket 3. For this reason, it is possible to easily inspect the caulking strength and the like.

(Other embodiments)
In the above embodiment, the weight 5 is caulked by each leg 32b of each side wall 32 of the inner bracket 3 in each recess 5a. However, as long as the weight 5 is caulked by each side wall 32 of the inner bracket 3, the weight 5 is Any portion may be caulked by each side wall portion 32 of the inner bracket 3, and the weight 5 may be caulked by any portion of each side wall portion 32 of the inner bracket 3.

  In the above embodiment, the through hole 5 c is formed in the weight 5, but a hole other than the through hole may be formed on the upper surface of the weight 5.

  Moreover, in the said embodiment, although two claw parts 21a and 21a are arrange | positioned in the bottom wall part 21 of the outer bracket 2, you may provide one or three or more claw parts 21a.

  Moreover, in the said embodiment, although the cut | disconnection 21b is formed in the bottom wall part 21 of the outer bracket 2, and the nail | claw part 21a bends the inner part of this cut | interruption 21b inside the outer bracket 2, it is not restricted to this. For example, the claw portion 21 a may be provided separately from the bottom wall portion 21 of the outer bracket 2, and the claw portion 21 a may be attached to the bottom wall portion 21 of the outer bracket 2.

  Moreover, in the said embodiment, each level | step-difference part 5b of the weight 5 is made to incline toward the front-back direction outward as the side part inside each front-back direction of each leg part 32b of the inner bracket 3 goes below, and this step part 5b of this weight 5 is this. The step portion 5b is sandwiched between the two leg portions 32b and 32b adjacent in the front-rear direction, but the step portion 5b of the weight 5 may be sandwiched between the two leg portions 32b and 32b by other means.

  In the above embodiment, the length in the front-rear direction of the bottom wall portion 31 of the inner bracket 3 is shorter than the length in the front-rear direction of the upper surface of the weight 5. good.

  Moreover, in the said embodiment, although the two notches 31b and 31b are formed in the bottom wall part 31 of the inner bracket 3, it is not necessary to form these.

  In the above embodiment, the weight 5 is caulked by the side wall portions 32 of the inner bracket 3, and at the same time, the claw portions 21 a of the bottom wall portion 21 of the outer bracket 2 are connected to the openings 31 a of the bottom wall portion 31 of the inner bracket 3. However, these may be performed at different times.

  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 indicated by the claims, and is not restricted by the text of 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 dynamic damper and the manufacturing method thereof according to the present invention can be applied to applications for shortening the manufacturing time.

It is a perspective view of a dynamic damper concerning an embodiment of the present invention. It is a figure which shows a dynamic damper, (a) is a top view of a dynamic damper, (b) is a front view of a dynamic damper. It is a perspective view of an outer bracket. It is a figure which shows an outer bracket, (a) is a top view of an outer bracket, (b) is a front view of an outer bracket. It is a perspective view of an inner bracket. It is a figure which shows an inner bracket, (a) is a top view of an inner bracket, (b) is a front view of an inner bracket, (c) is a side view of an inner bracket. It is a perspective view of a weight. It is a figure which shows a weight, (a) is a top view of a weight, (b) is a front view of a weight. It is a figure which shows the manufacturing process of a dynamic damper, (a) is a figure which shows a vulcanization molded object formation process, (b) is a figure which shows a caulking process and a nail | claw part insertion process. It is a front view of the dynamic damper concerning the past.

1 Dynamic damper 1a Vulcanized molded body 2 Outer bracket (outer member)
3 Inner bracket (inner member)
4 Rubber elastic body 5 Weight (mass member)
5a Concave part 5b Step part 5c Through-hole 21 Bottom wall part 21a Claw part 21b Cut 22 Side wall part 31 Bottom wall part 31a Opening 31b Notch 32 Side wall part 32a Notch 32b Leg part

Claims (4)

A dynamic damper that is attached to the vibration source side and attenuates vibrations on the vibration source side;
An outer member attached to the vibration source side and having a bottom wall portion and a pair of side wall portions;
It is provided inside the outer member, and has a bottom wall portion facing the bottom wall portion of the outer member and having an opening, and a pair of side wall portions respectively facing both side wall portions of the outer member. An inner member;
A pair of rubber elastic bodies that respectively connect the opposite side wall portions of the outer member and the inner member;
A mass member that is provided inside the inner member, has a hole formed in a surface facing the bottom wall portion of the inner member so as to correspond to the opening of the bottom wall portion, and is caulked on each side wall portion of the inner member. And
The bottom wall portion of the outer member is provided with a claw portion inserted into the hole of the mass member through the opening of the bottom wall portion of the inner member ,
A cut is formed in the bottom wall portion of the outer member so as to correspond to the opening of the bottom wall portion of the inner member,
The dynamic damper according to claim 1, wherein the claw portion is formed by bending an inner portion of the cut of the bottom wall portion of the outer member toward the inner side of the outer member . In the dynamic damper according to claim 1 Symbol placement,
Each side wall portion of the inner member has a notch formed in the center portion in the front-rear direction, and both side portions in the front-rear direction of the notch constitute leg portions,
The mass member has recesses formed at the four corners of the surface opposite to the surface facing the bottom wall of the inner member so as to correspond to the legs, and adjacent to each other in the front-rear direction. The step portions are respectively caulked to the leg portions in the concave portions so that the step portions are sandwiched between two leg portions adjacent to the step portion in the front-rear direction. Dynamic damper characterized by The dynamic damper according to claim 1 or 2 ,
The length in the front-rear direction of the bottom wall portion of the inner member is the same as or shorter than the length in the front-rear direction of the surface facing the bottom wall portion of the mass member,
A dynamic damper, wherein notches are formed in both front and rear end edges of the bottom wall of the inner member. It is a manufacturing method of the dynamic damper according to any one of claims 1 to 3 ,
Forming a vulcanized molded body by integrally vulcanizing the rubber elastic bodies with the outer member and the inner member using a mold; and
Providing the mass member inside the inner member of the vulcanized molded body;
Caulking the mass member at each side wall of the inner member of the vulcanized molded body;
And a step of inserting the claw portion of the bottom wall portion of the outer member of the vulcanized molded body into the hole of the mass member through the opening of the bottom wall portion of the inner member. Method.

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