JP4402428B2 - Dynamic damper - Google Patents

Description

  The present invention relates to a dynamic damper that is attached to various vibration members of automobiles, other vehicles, industrial machines, etc., and effectively reduces the resonance amplitude of the vibration member, and can easily prevent unintentional dropping of mass. Propose technology.

  In a dynamic damper attached to a vehicle body or other structural member of an automobile, for example, those disclosed in Japanese Patent Application Laid-Open No. 11-117990 and Japanese Patent Application Laid-Open No. 2000-18317 can be used to prevent unexpected mass dropout. .

Here, the former dynamic damper has a rubber elastic body in which an assembly plate to a vibration member is attached to one side surface and a mass member support plate is vulcanized and bonded to the other side surface, and a mass supported by the mass member support plate. A member, a mass member attaching means for attaching the mass member to the mass member supporting plate, and a drop-off preventing means for preventing the plate from separating from the assembly plate when the mass member supporting plate is detached from the elastic body. The mass member attaching means here is composed of rivets or the like, and the drop-off preventing means is formed by bending or punching a metal plate by pressing, and is fastened to the support plate by the rivets. Has been.
In such a dynamic damper, the mass member can be securely attached to the plate with a simple structure without using a means such as welding.

  In addition, the latter dynamic damper is designed to prevent the mass bracket from falling off even when the mass bracket attached via the elastic body is removed between the mounting portions of the mounting bracket. The mounting part and mass bracket are vulcanized and bonded with an elastic body.In the mounting part of the mounting bracket, a through hole is provided in the mounting part adjacent to the elastic body vulcanization bonding point, and the through hole is inserted into the through hole. A plate having a rod-shaped portion that can be moved is placed between two through holes, and a mass bracket is fixed to the plate so that the plate follows the movement of the mass bracket.

JP 11-117990 A JP 2000-18317 A

  However, in the former dynamic damper disclosed in Japanese Patent Application Laid-Open No. 11-117990, in order to prevent the mass member from falling off, a drop-off preventing means formed by pressing a metal plate and a drop-off preventing means formed on the assembly plate are inserted. Holes and means for attaching the mass member support plate and mass member to the drop-off prevention means are required. In the latter dynamic damper disclosed in Japanese Patent Laid-Open No. 2000-18317, both end portions are fixed to the mass metal fitting. Plate and a through hole that is formed in the mounting portion of the mounting bracket and allows the rod-shaped portion of the plate to pass therethrough. However, there is a problem that an increase in cost due to an increase in the number of manufacturing steps of the dynamic damper is inevitable.

  An object of the present invention is to solve such problems of conventional dynamic dampers, and the object of the present invention is to simplify the structure especially by making the mass cylindrical. In addition, the present invention is to provide a dynamic damper that suppresses an increase in cost.

The dynamic damper according to the present invention is configured so that, for example, each of the opposing face plates of the pair of mounting brackets, one end portion of which is attached to an engine or other vibration member in a mutually separated posture and the other end portion protrudes from the vibration member. Next, the end face of the column-shaped mass is vulcanized and bonded via the respective cylindrical elastic bodies, and the other end portion of the pair of mounting brackets is seen on each opposing face plate from the direction of the central axis of the mass. In addition, a pair of drop-off prevention claws that are located at a distance smaller than the diameter of the pair and that extend toward the opposing face plate are provided at a distance from the circumferential surface of the mass, and are formed on the respective face plates. Each of the drop-off prevention claws extending in the direction facing each other is integrally connected, and the maximum diameter of the elastic body is made smaller than the distance between the pair of drop-off prevention claws .
According to this, the mass and the elastic body constitute a spring-mass system of the dynamic damper, and the vibration of the vibrating member can be effectively absorbed under the natural frequency of the system.

  In addition, here, for example, when the mass is peeled off from the elastic body, for example, each pair of drop-off preventing claws located at a lower interval than the mass diameter of the mass, The opposite side edges of each nail can be supported reliably and sufficiently stably, so that the mass can be effectively prevented from falling off. This is particularly noticeable when the mass is brought close to the diameter of the mass and the mass is hooked and supported by the fall-off preventing claws in a posture in which the mass protrudes more downward from between the fall-off prevention claws.

By the way, each pair of drop-off prevention claws here is very simple and simple, and can be easily formed by pressing the mounting bracket itself, etc. Since it is possible to form the drop-off prevention nail without adding a special process for forming the nail, the structure of the dynamic damper as a whole is simplified, and an increase in the number of manufacturing steps of the dynamic damper is prevented. , that it cost Ki de be kept sufficiently low.

Note here, the mass forms a cylindrical, when linked to the opposite surface plates in the protruding position from among disengagement prevention claw of each pair, for example, a dynamic da damper, the side of the drop-off prevention pawl vibration member Even if the mass is peeled off from the elastic body, it is possible to effectively prevent the mass from coming off by the fall-off preventing claw, which means that the mass diameter is as large as possible. Thus, it is particularly effective when the initial projection amount of the mass from between the drop-off preventing claws is set larger.

Here, preferably, the elastic body is made of rubber, and each rubber is joined directly or indirectly to each of the opposing face plate and the end face of the mass.
When the elastic body has a rubber elastic body, attachment to the required members, by joining them by vulcanization bonding or the like, can be performed easily and reliably. By the way, such a rubber elastic body can be directly joined to each of the opposing face plate and the end face of the mass by adhesion or the like, and each intermediate mounting plate joined with the elastic body is made to face the opposing face plate and It can also be indirectly joined by fixing or fixing to each of the masses. In the former case, the number of parts is reduced, and according to the latter, the elastic body can be changed and replaced easily and quickly. Can be possible.

  In this case, it is more preferable that the cross-sectional contour shape of the elastic body is, for example, a circle concentric with the mass. According to this, the vibration input in each direction orthogonal to the central axis of the mass is dynamic. Since the natural frequency of the damper can always be constant, the dynamic damper can function as expected with respect to inputs from various directions.

Further, according to the present invention, the rigidity of the drop-off prevention claws is increased by integrally connecting the drop-off prevention claws formed on the respective facing face plates and extending in the directions facing each other. The mass support function can be more fully exhibited, and at the same time, a pair of mounting brackets can be made into an integrated structure, which makes it easier to manufacture and handle them.

  Preferably, an attachment portion that protrudes in a direction away from each other is provided at an end portion of each facing face plate opposite to the position where the drop-off preventing claw is formed. According to this, it is possible to easily attach the mounting bracket to the vibration member without interference with the mass, the elastic body, or the like.

By the way, the maximum diameter of the elastic body is set to be smaller than the distance between the pair of drop-off preventing claws , and the vulcanization of the two-part type is performed for vulcanization joining of the unvulcanized rubber elastic body to the mass and both opposed face plates. The mold can be inserted between the facing plates from a required direction, and the manufacturing freedom is greatly increased.

  Thus, according to the present invention, by forming the mass into a columnar shape, the drop-off preventing means that engages with the circumferential surface of the mass and supports it sufficiently stably is provided from, for example, the lower end of the opposing face plate of each mounting bracket. The entire structure of the dynamic damper, because it can be constructed with each of the straight drop-off prevention claws that are paired with each other with a simple and simple structure that protrudes in the direction facing each other. In addition, the increase in the number of manufacturing steps of the dynamic damper can be advantageously suppressed, and the cost can be sufficiently reduced.

Embodiments of the present invention will be described below based on the drawings.
1 is a front view showing an embodiment of the present invention, FIG. 2 is a side view thereof, and FIG. 3 is a bottom view thereof.

  Here, a pair of mounting brackets 1 and 2 that are spaced apart on the left and right in FIG. 1 and are opposed to each other are integrally formed, and the opposing face plates 3 and 4 that are perpendicular to each other in the drawing are shown. One end face of each of the substantially cylindrical elastic bodies 5 and 6 made of rubber, which is preferably made of rubber, is directly joined to each other on a common axis by vulcanization bonding or the like. The other end surfaces 5 and 6 are directly concentrically joined to the respective end surfaces of the mass 7 which also has a cylindrical shape.

In addition, here, as shown in FIG. 2, the opposing face plates 3 and 4 are paired at a distance C smaller than the diameter D of the mass 7 when viewed from the central axis direction. Drop-off prevention claws 8, 9 extending toward the opposing face plate are provided at a predetermined interval from the peripheral surface of the mass 7, and in this figure, the pairs of drop-off prevention claws 8, 9 facing each other. Connect the two together at their tips.
Accordingly, the pair of opposed face plates 3 and 4 and the two pairs of drop-off preventing claws 8 and 9 shown in FIG. 3 have a substantially rectangular frame shape when viewed from the bottom.

Note here, the falling-off prevention claw 8,9 of each pair, their tip, as shown in a front view in FIG. 4, a Rukoto possible to terminate without continuous to each other, in this case, The pair of left and right mounting brackets 3 and 4 are separate from each other.

  Furthermore, the respective mounting portions 10 and 11 projecting in the direction away from each other are provided at the upper ends of the respective facing face plates 3 and 4, so that the overall shape of the mounting brackets 1 and 2 that are integrated with each other can be obtained. It is almost crank-shaped in front view. In addition, a plurality of bolt insertion holes 12 and 13 in the figure are provided in each of the mounting portions 10 and 11 provided in this way, so that the dynamic damper can be attached to the vibration member.

  By the way, in the dynamic damper comprised in this way, it is preferable to connect the mass 7 with the opposing face plates 3 and 4 in the attitude | position which protrudes below rather than the drop prevention claws 8 and 9. FIG. Note that the minimum distance between the peripheral surface of the cylindrical mass 7 and each of the drop-off preventing claws 8 and 9 can be about 5 mm. This also applies to the minimum distance between the peripheral surface of the mass and the upper surface of the mounting portion. It is the same. That is, based on the vibration of the vibrating member, the dynamic damper mass 7 vibrates up and down, etc., and when the dynamic damper performs its original function, there is an interval of about 5 mm in the vertical direction of the mass 7. For example, the interference between the mass 7 and the vibration member and the drop-off preventing claws 8 and 9 can be effectively prevented.

  Such a dynamic damper is, for example, selected from both elastic bodies 5 and 6 and a mass 7 by fastening them with bolts 15 and 16 to the lower surface of the vibration member 14 as shown by phantom lines in FIG. The original function of the dynamic damper can be sufficiently exerted under the action of a spring-mass system having a large spring force and mass.

On the other hand, due to fatigue, deterioration, etc., of the rubber as the elastic bodies 5 and 6 due to the long-term use of the dynamic damper, the mass 7 is peeled off from it, and the elastic support thereof is not performed. In this case, as shown in FIG. 5, the mass 7 enters between the pair of drop-off preventing claws 8 and 9 and is securely and stably hooked and supported by the claws 8 and 9. The unexpected drop-off of the mass 7 from the mounting brackets 1 and 2 is sufficiently prevented. Such hooking support of the mass 7 brings the distance between the pair of drop-off preventing claws 8 and 9 close to the diameter of the mass 7 and increases the amount of downward projection of the mass 7 between the claws. In this way, it will be performed more stably.
Further, such an action of the drop-off preventing claw is similarly performed in the dynamic damper shown in FIG.

  By the way, in the case of such a dynamic damper, when each of the elastic bodies 5 and 6 is formed into a substantially cylindrical shape, the cross-sectional contour shape thereof is a non-directional circle, more preferably a circle concentric with the mass 7. Can effectively reduce the resonance amplitude of the vibration member under a constant natural frequency for various vibration inputs in the direction orthogonal to the central axis of the mass 7 as well as the vertical direction shown in the figure. This also applies to the case where the dynamic damper is mounted on the vibration member 14 in a posture in which the dynamic damper is rotationally displaced over the required angular range clockwise or counterclockwise as shown in FIG. The same is true.

If the mass 7 is peeled off from the elastic bodies 5 and 6 in such a mounting posture of the dynamic damper, the cylindrical mass 7 is projected between the opposing face plates in a protruding posture between the drop-off preventing claws. By connecting, the drop-off prevention claw based on making the distance H between the upper surfaces of the drop-off prevention claws 8 and 9 and the upper surfaces of the attachment members 10 and 11 smaller than the diameter D of the mass 7 in the illustrated damper posture. Under the actions of 8 and 9, the mass 7 can be sufficiently prevented from falling off as in the previous case.

  Here, when the maximum diameter d of the elastic bodies 5 and 6 is set smaller than the distance C between the pair of drop-off preventing claws 8 and 9 as shown in the figure, the unvulcanized rubber elastic body is connected to the mass 7 and When vulcanizing and joining the opposing face plates 3 and 4 using a two-part vulcanization mold, as shown in FIG. 6 (a), the molds M1 and M2 that make a pair are In addition to being able to be inserted between the opposing face plates, as shown in FIG. 6B, it is also possible to insert a pair of molds M3 and M4 between the opposing face plates from above and below.

It is a front view which shows embodiment of this invention. It is a side view of FIG. It is a bottom view of FIG. It is a front view which shows the modification of FIG. It is a side view which shows the effect | action of a drop-off prevention nail | claw. It is a figure which illustrates the vulcanization joining aspect to a mass and an opposing surface board of an unvulcanized rubber elastic body.

Explanation of symbols

1, 2 Mounting brackets 3, 4 Opposing face plates 5, 6 Elastic body 7 Mass 8, 9 Drop-off prevention claw 10, 11 Mounting portion 12, 13 Bolt insertion hole 14 Vibration member D Mass diameter C Fall prevention claw interval d Elastic body maximum diameter H distance

Claims (4)

Attached to one end portion to the vibration member in spaced orientation of one another, each other end portion of the mutual opposing faceplate of a pair of mounting brackets projecting from the vibration member, the end face of the mass which forms a cylindrical, columnar each of the elastic body vulcanization is deposited over the, in the other end portion of the pair of mounting brackets, each opposing faceplate, as seen from the center axis direction of the mass, situated at a smaller distance than the diameter A pair of drop-off preventing claws extending toward the opposing face plate forming a pair are provided at a distance from the peripheral surface of the mass, and each of the drop-off preventing claws formed on the respective facing face plates and extending in directions facing each other is integrated. Dynamic dampers that are connected to each other and have the maximum diameter of the elastic body smaller than the distance between the pair of drop-off prevention claws .   The dynamic damper according to claim 1, wherein the mass is connected to the opposing face plate in a protruding posture from between each pair of drop-off preventing claws. The dynamic damper according to claim 1 or 2, wherein the elastic body is rubber and each rubber is vulcanized and bonded to each of the opposing face plate and the end face of the mass. The dynamic damper according to any one of claims 1 to 3 , wherein an attachment portion that protrudes in a direction away from each other is provided at an end portion of each opposing face plate opposite to a position where the drop-off preventing claw is formed.

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