JP2003240046A - Dynamic damper and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a fail safe mechanism capable of substantially safely preventing a measure member in a breakage time of a support rubber elastic body of a dynamic damper, with less components and in a simple structure. <P>SOLUTION: An annular holding part 20 having an insert hole 24 is formed on one side of a fixed member 12 fixed to a vibration member and the measure member 14, the holding part 20 is divided in one place on the periphery to form an opening 26, and an engaging part 33 is formed on the other side of the fixed member 12 and the measure member 14. The engaging part 33 is inserted into the opening 26 of the holding part 20 and is disposed in an insert state into the insert hole 24 of the holding part 20 and a disabling state of removal in the insert direction, and the opening 26 of the holding part 20 is narrowed to member thickness of the engaging part 33 or shorter. The dynamic damper 10 has such a structure. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dynamic damper which is attached to a vibrating member such as an automobile body, a subframe, an exhaust pipe, etc. where vibration is a problem, and reduces the vibration of the vibrating member, and a manufacturing method thereof. .

[0002]

2. Description of the Related Art Conventionally, a dynamic damper has been used as one means for suppressing vibration in a vibrating member in which vibration of a car body or the like poses a problem. The dynamic damper generally has a structure in which a mass member having a predetermined mass is elastically connected to and supported by a fixing member fixed to the vibrating member via a supporting rubber elastic body. The vibration of the main vibration system is suppressed by constituting one vibration system by using this vibration system as a sub-vibration system for the main vibration system constituted by the vibration member.

By the way, in such a dynamic damper, when the supporting rubber elastic body is broken in the sub-vibration system which is repeatedly excited by the vibration input from the vibrating member, the mass member is separated from the fixing member and falls off. As a result, there is a risk that it may hit other members and cause damage or safety problems. Therefore, it is conceivable to employ a fail-safe mechanism that prevents the mass member from completely falling off even if the supporting rubber elastic body is broken.

However, the conventional fail-safe mechanism is
For example, JP-A-11-117990 and JP-A-2000.
No. 18317, a fail-safe fitting whose relative displacement is limited by abutting against a fixing member is formed separately from the mass member, and the mass member is fixed via a support rubber elastic body. While the elastic member is elastically supported, the fail-safe fitting must be post-fixed to the mass member with bolts, etc., which increases the number of parts and the manufacturing work of the dynamic damper. However, there was a problem that it was difficult to automate the manufacturing process.

Incidentally, the applicant of the present invention has previously disclosed that the Japanese Patent Application Laid-Open No. 9-1
In Japanese Patent No. 66178, a holding hole is formed in a fixing member, and a cutting groove is provided at one position on the circumference of the holding hole,
A small-diameter connecting shaft portion of a mass member whose both longitudinal ends are larger than the holding hole is inserted into the holding hole from the cutting groove so as to be inserted therethrough, and the mass member including the connecting shaft portion is fixed to the fixing member. We proposed a dynamic damper with a structure in which a supporting rubber elastic body is directly connected to the peripheral edge of the holding hole.

However, in the dynamic damper disclosed in the prior application, since it is necessary to vulcanize and form the supporting rubber elastic body in the holding hole of the fixing member in which the mass member is inserted and arranged, the supporting rubber elastic body is required. There is a problem that the degree of freedom in tuning tends to be limited with respect to the body shape, spring characteristics, and the like. Further, in order to easily perform the work of inserting the mass member into the holding hole and assembling it, it is necessary to form a large cutting groove, but in such a case, the supporting rubber elastic body was broken. At this time, there is a problem that the mass member easily pops out from the holding hole through the cutting groove, and it becomes difficult to stably exhibit the fail-safe function, and there is still room for improvement.

[0007]

The present invention has been made in view of the circumstances as described above, and the problem to be solved is that when a supporting rubber elastic body that elastically supports a mass member to a fixing member is broken. Another object of the present invention is to provide a dynamic damper having a novel structure that can realize a fail-safe mechanism for preventing the mass member from completely falling off with a small number of parts and a simple structure.

Further, according to the present invention, in the dynamic damper, a fail-safe mechanism for preventing the mass member from completely falling off when the supporting rubber elastic body for elastically supporting the mass member on the fixing member is broken is provided with a small number of parts and a simple structure. It is also an object of the present invention to provide a new method for manufacturing a dynamic damper that can be applied with a simple structure and with good manufacturing workability.

[0009]

Aspects of the present invention made to solve such problems will be described below. The constituent elements used in each of the following aspects can be used in any combination as much as possible. Further, the aspects and technical features of the present invention are not limited to those described below, but are described in the entire specification and the drawings, or the invention idea that can be understood by those skilled in the art from those descriptions. It should be understood that it is recognized based on this.

First, according to a first aspect of the present invention relating to a dynamic damper, a mass member having a predetermined mass is elastically connected to and supported by a fixing member fixed to a vibrating member via a supporting rubber elastic body. A dynamic damper that constitutes a sub-vibration system with respect to a main vibration system that is constituted by the vibrating member, and is inserted into a position avoiding a connecting portion by the supporting rubber elastic body on one side of the fixing member and the mass member. An annular holding portion having a hole is formed, and the holding portion is divided at one position on the circumference to form an opening portion connected to the insertion hole, while the fixing member and the mass member are formed. It is inserted through the opening of the holding part at a position avoiding the connection part by the supporting rubber elastic body on the other side, and is inserted into the insertion hole of the holding part and does not come out in the insertion direction. An engaging portion disposed on the holding portion is formed at a substantially central position of the insertion hole, and the opening portion of the holding portion is engaged with the engaging portion. It is characterized in that it is narrowed to a size equal to or smaller than the minimum member size in the insertion portion of the joint portion into the insertion hole.

In the dynamic damper having the structure according to the present embodiment, the mass vibration member elastically supported by the supporting rubber elastic body is excited and displaced at the time of vibration input to form the sub vibration system, and the main vibration system. The vibration damping effect is exerted on the barrel vibrating member. Here, in such a dynamic damper, when the supporting rubber elastic body is ruptured by skillfully utilizing the fixing member and the mass member, the insertion hole formed in one of them and the engaging portion formed in the other The fail-safe mechanism that prevents the mass member from completely falling off can be configured with a simple structure without the need to add or attach a special member that functions only as a fail-safe mechanism. Moreover, since the fail-safe mechanism is realized by using the fixing member and the mass member, it is possible to advantageously avoid an increase in the size of the entire dynamic damper due to the addition of the fail-safe mechanism, and it is possible to realize a compact dynamic damper. Of.

Further, in such a fail-safe mechanism, the holding portion and the engaging portion constituting the fail-safe mechanism are arranged apart from each other, and they hardly come into contact with each other at the time of normal vibration input. It does not have a significant effect on the anti-vibration characteristics of the secondary vibration system.

In addition, since the holding portion and the engaging portion which constitute the fail-safe mechanism are arranged so as to avoid the connecting portion between the fixing member and the mass member by the supporting rubber elastic body, the spring of the supporting rubber elastic body is provided. The degree of freedom in tuning the sub-vibration system can be advantageously secured without being limited by the provision of the fail-safe mechanism without limiting the degree of freedom in designing the characteristics.

Further, in such a fail-safe mechanism, the engaging member of the mass member is inserted into the insertion hole through the opening formed in the substantially annular holding portion, and then the opening is narrowed. Since it can be prevented from completely falling off, and the amount of processing deformation applied to the holding portion can be extremely small, the processing can be facilitated and the member strength and durability can be highly realized.

In this embodiment, the fail safe mechanism including the holding portion and the engaging portion forming the insertion hole is provided between the fixing member and the mass member in an appropriate number of one or two or more. Is possible. In addition, the specific shape and structure of the fixing member, the mass member, the supporting rubber elastic body, etc.
It is appropriately set taking into consideration the required damping characteristics, the allowable installation space, etc., and is not limited. For example, consider the vibration frequency and the magnitude of vibration to be damped. The mass and shape of the mass member can be appropriately changed, and a shear deformation type or a compression deformation type can be selectively used mainly as the supporting rubber elastic body.

A second aspect of the present invention relating to the dynamic damper is the dynamic damper according to the first aspect, wherein the engaging portion has a flat plate shape and is substantially orthogonal to the main vibration input direction. It is characterized in that the opening dimension of the opening portion in the holding portion is set to be equal to or less than the plate thickness dimension. According to this aspect, the opening size of the opening of the holding portion can be made as small as possible, and the mass member (engaging portion) can be more completely prevented from being detached from the holding portion.
It is possible to further reduce the amount of deformation exerted on the holding portion in order to narrow the opening size of the holding portion. Moreover,
A large contact area of the engaging portion with the holding portion when the supporting rubber elastic body is broken can be efficiently secured, and the operation of the fail-safe mechanism can be stabilized and the load bearing strength can be improved.

A third aspect of the present invention relating to a dynamic damper is the dynamic damper according to the first or second aspect, wherein the opening portion of the annular holding portion has a main vibration input direction in the annular holding portion. It is characterized in that it is formed at a position avoiding the facing part of. In this aspect, even when the supporting rubber elastic body is broken, it is possible to reduce or avoid the engagement portion of the mass member being displaced toward the opening portion of the holding portion and being brought into contact therewith. Therefore, it is possible to more completely prevent the mass member (engaging portion) from being detached from the holding portion.

A fourth aspect of the present invention relating to a dynamic damper is the dynamic damper according to any one of the first to third aspects, wherein the dynamic damper is provided on one side of the fixing member and the mass member. The holding portion that forms the insertion hole, and the engagement portion that is provided on the other side of the fixing member and the mass member and that is inserted into the insertion hole of the holding portion. It is characterized in that each pair is formed so as to be located on both sides of the supporting rubber elastic body that connects the mass members. In this aspect as described above, the pair of holding portions and the engaging portions prevent the mass member from being completely dropped by supporting the mass member at two places when the supporting rubber elastic body is broken. By suppressing the strength required for the holding portion and the engaging portion at one location, the structure can be simplified and the manufacturing can be facilitated, and when the supporting rubber elastic body is ruptured, the mass member is fixed to the fixing member. Therefore, it is possible to stably support it at a plurality of points and prevent complete dropout.

A fifth aspect of the present invention relating to a dynamic damper is the dynamic damper according to any one of the first to fourth aspects, wherein the fixing member is directly connected to the fixing rubber elastic body. The mass member is formed by including a mounting member integrally formed with the engaging portion, and a mass member separately formed from the mounting member and fixed to the mounting member afterwards. Characterize. In this aspect, the holding portion can be easily formed on the attachment member that is formed separately from the mass member, and the vulcanization molding of the support rubber elastic body can be performed in a compact form without the mass member. Since it can be performed between the mounting member and the fixing member, manufacturing becomes easier.

In the fifth aspect, it is desirable to employ it in combination with the fourth aspect. For example, the central portions of the fixing member and the mounting member are positioned to face each other, and their facing surfaces are opposed to each other. The supporting rubber elastic body is disposed between the fixing members, and the pair of holding portions are formed so as to project toward the mounting member on both sides of the central portion with respect to the fixing member. On the other hand, by forming a pair of the engaging portions extending outward so as to be separated from each other on both sides of the central portion, the supporting rubber elastic body is sandwiched in one direction on both sides of each of the engaging portions. It is preferable that the engaging portion is located in the insertion hole of each holding portion, and the mass member is fixed to both end portions of each engaging portion extending outward from the insertion hole. Can be adopted by.

A sixth aspect of the present invention relating to the dynamic damper is characterized in that, in the dynamic damper according to the fifth aspect, both the fixing member and the mounting member are formed by press plate metal fittings. To do. In this aspect, the fixing member and the mounting member connected by the supporting rubber elastic body can be processed to easily manufacture both of the members having the holding portion and the engaging portion. , Since the fixing member and the mounting member thus press-molded are compact and lightweight,
It is also possible to set the supporting rubber elastic body in the molding cavity of the molding die and mold the supporting rubber elastic body as an integrally vulcanized molded product including the fixing member and the mounting member.
In addition, in this aspect, the fixing member and the mounting member are commonly used, and a plurality of types of mass members that can be mounted on the mounting member have different masses are prepared to obtain the required damping characteristics. The mass member to be mounted can be selected accordingly.

A seventh aspect of the present invention relating to a dynamic damper is the dynamic damper according to any one of the first to sixth aspects, wherein the dynamic damper is provided on one side of the fixing member and the mass member. The holding portion that forms the insertion hole, and the engagement portion that is provided on the other side of the fixing member and the mass member and that is inserted into the insertion hole of the holding portion. When the mass member is independent of the fixing member, the mass member is substantially directly contacted with each other at the contact portion where the mass member is contacted with each other. In this aspect, when the supporting rubber elastic body is broken and the engaging portion of the mass member is brought into contact with the holding portion, the engaging portion and the holding portion formed of a rigid material such as metal. Is abutting and vibrating positively by making direct contact with each other without passing through a cushioning rubber or the like, and the occurrence of an abnormality can be promptly perceived by such a vibration that is easily perceived. is there. Therefore, it becomes possible to promptly take measures such as replacement or repair of the dynamic damper when the elastic support rubber is broken.

Further, a feature of the present invention relating to the method of manufacturing the dynamic damper is that a mass member having a predetermined mass is elastically connected and supported to a fixed member fixed to the vibrating member via a support rubber elastic body. A method for manufacturing a dynamic damper in which a sub-vibration system is configured with respect to a main vibration system configured by the vibrating member, and (a) is directly connected to the fixed member via the support rubber elastic body. The mass member is configured to include a mounting member that is formed separately from the mounting member and is fixed to the mounting member afterwards, and (b) in any one of the fixing member and the mounting member, An annular holding portion having an insertion hole opened to the outer peripheral side through an opening formed in one part on the circumference is provided, and (c) at the other of the fixing member and the mounting member, the holding member is provided. An engaging portion which is incapable inserted escape in the insertion direction is provided with respect to the insertion hole formed in the part,
(D) The engaging portion is inserted into the insertion hole through the opening, the fixing member and the mounting member are positioned to face each other, and the supporting rubber elastic body is provided between the facing surfaces of the fixing member and the mounting member. The supporting rubber elastic body is vulcanized and adhered to the fixing member and the mounting member by vulcanization molding, and the engaging portion is separated from the holding portion and positioned substantially in the center of the insertion hole. e) After the engaging portion is inserted into the insertion hole, the holding portion is plastically deformed to narrow the opening portion, and (f) the supporting rubber elastic body is vulcanized and molded, and then the mounting member is provided with The mass member is fixed to form the mass member.

According to such a method of the present invention, a dynamic damper provided with a fail-safe mechanism for preventing the mass member from completely falling off when the supporting rubber elastic body is broken based on the engaging action of the engaging portion with respect to the holding portion. Therefore, the dynamic damper having a specific structure constructed according to the present invention as described above can be advantageously manufactured.

In the present invention, the step of plastically deforming the holding portion to narrow the opening may be performed at any time after the engaging portion is inserted into the insertion hole through the opening. May be performed, for example, before setting the fixing member and the mounting member in the mold of the support rubber elastic body,
It is also possible to set the fixing member and the mounting member in the molding die of the supporting rubber elastic body and then use the clamping force of the molding die, or to mold the supporting rubber elastic body to form the fixing member and the mounting member. It may be carried out after vulcanization and adhesion to the above. Further, when the fixing member or the mounting member is subjected to a treatment such as coating for rust prevention or vulcanization adhesion, at any stage before or after such treatment, the step of narrowing the opening to the holding portion is performed. May be performed.

[0026]

Embodiments of the present invention will now be described in detail with reference to the drawings in order to more specifically clarify the present invention.

First, FIGS. 1 to 3 show a dynamic damper 10 as an embodiment of the present invention. In this dynamic damper 10, a mass member 14 is connected and supported to a fixing member 12 as a fixing member via a supporting rubber elastic body 16. The dynamic damper 10 is mounted such that a fixing member is fixed to a vibration member, such as an automobile body, which is a vibration suppression target.
And a mass-spring system composed of the supporting rubber elastic body 16,
A sub-vibration system for the vibration member that is the main vibration system is configured. In the following description, the up-down direction basically indicates the up-down direction in FIG. 1, and the up-down direction when the dynamic damper 10 is mounted is substantially vertical.

More specifically, the fixing member 12 has a rectangular flat plate-shaped central plate portion 18 provided in the central portion and extending in a substantially horizontal direction, and both side portions of the central plate portion 18 which face each other in one direction are directed downward. It has holding plate portions 20 and 20 as a pair of holding portions which are formed by being bent at a substantially right angle toward each other and which spread in a substantially vertical direction. A fixing bolt 22 protruding upward is planted in the center of the central plate portion 18. The fixing bolt 22 allows the fixing metal fitting 1 to be fixed.
2 is fixed to a vibration member (not shown).

Further, each holding plate portion 20 has a horizontally long rectangular flat plate shape having a width dimension in the horizontal direction larger than a height dimension, and a horizontally long substantially rectangular shape is inserted in the central portion thereof. A hole 24 is formed. In addition, the pair of holding plate portions 20 and 2
The pair of insertion holes 24, 24 formed in 0 are the holding plate portion 2
They are aligned with each other in 0, 20 facing directions. Furthermore, each holding plate portion 20 is formed with a slit-shaped opening 26 that is cut in the horizontal direction from one end face in the longitudinal direction with a predetermined opening dimension: L, and the insertion hole 24 is formed through this opening 26. The holding plate portion 20 is penetrated and opened. In addition, it is desirable that the insertion hole 24 is formed at a substantially central portion in the height direction or at a position deviated upward from the central portion in the peripheral wall portion extending in the height direction on the one end side in the horizontal direction. As a result, in each holding plate portion 20, the opening 2 is located at one end side in the longitudinal direction of the insertion hole 24.
The peripheral wall portion in which 6 is formed and extends in the height direction is the opening 2
The upper and lower sides sandwiching 6 are formed in a hook shape protruding downward and upward, respectively.

The fixing bracket 1 having such a structure
2 can be advantageously formed, for example, by pressing a metal plate having a substantially rectangular flat plate shape.

On the other hand, the mass member 14 comprises a mounting member 28 as a mounting member and a mass member 30 as a mass member. The mounting member 28 is provided with a central plate portion 32 in the shape of a rectangular plate, which is provided in the central portion and spreads in a substantially horizontal direction.
A pair of support plate portions 33, 33 extending from both side portions of the central plate portions 32, 32 facing each other in one direction are integrally formed,
Have In addition, the pair of support plate portions 33, 33 have horizontal plate portions 35, 35 as engaging portions which extend outward in the horizontal direction from both end edges of the central plate portion 32 with a substantially constant width dimension, and the horizontal plate portions 35, 35. The plate portions 35, 35 have a pair of vertical plate portions 34, 34 extending in a substantially vertical direction formed by bending the tip end portions of the plate portions 35, 35 downward at a substantially right angle. The pair of vertical plate portions 34, 34 each have a vertically long plate shape that extends downward with a substantially constant width dimension, and a bolt mounting hole 36 is provided near each lower end. There is. The mounting bracket 28 having such a structure can be advantageously formed, for example, by pressing an appropriate flat plate-shaped plate bracket.

Here, each support plate portion 33 (the horizontal plate portion 3)
5 and the vertical plate portion 34) has a width dimension of the central plate portion 32.
The width of the board is smaller than that. In addition, fixing metal fitting 1
In relation to 2, the support plate portion 33 has a plate width dimension:
The width b is smaller than the lateral width dimension B of the insertion hole 24 of the fixing member 12, and the plate thickness dimension t of the support plate portion 33 is sufficiently larger than the height dimension H of the insertion hole 24 of the fixing member 12. It has been made smaller. Particularly, in the present embodiment, the support plate portion 33
Of the plate thickness dimension of: the holding plate portion 20 of the fixing bracket 12
The opening dimension L of the opening portion 26 formed in is set so that t ≧ L.

The mass member 30 has a block structure made of a material having a high specific gravity such as cast iron. In this embodiment, the mass member 30 is formed in a substantially rectangular block shape as a whole. The mass metal fitting 30 is fitted between the pair of vertical plate portions 34, 34 of the mounting metal fitting 28 to be sandwiched by the pair of vertical plate portions 34, 34 from the left and right sides (the left and right in FIG. 1). The connecting bolts 37, 37, which are arranged in this manner and are inserted into the bolt mounting holes 36, 36 of the vertical plate portions 34, 34, are inserted into the screw holes 38, 38 formed on the left and right side surfaces of the mass metal fitting 30. By being screwed,
The mass metal fitting 30 is fixedly assembled to the mounting metal fitting 28. The upper end surface of the mass metal fitting 30 is superposed on the lower surface of the central plate portion 32 of the mounting metal fitting 28 in close contact with each other to stabilize the fixed state of the mass metal fitting 30 with respect to the mounting metal fitting 28.

Further, the mass metal fitting 30 is the mounting metal fitting 28.
The horizontal width dimension of the upper end portion fitted between the vertical plate portions 34, 34 is smaller than that of the lower end portion. Further, the vertical plate portions 34, 34 of the mounting member 28 are provided with a step portion 40 at an intermediate portion in the extending direction, and the distance between the facing surfaces of the lower end portions 42, 42 fixed to the mass member 30 is: Horizontal plate 3
It is smaller than the distance between the facing surfaces of the base end portions 44, 44 bent from 5. As a result, a predetermined gap is provided between the base end portions 44, 44 of the mounting bracket 28 protruding from the central plate portion 32 of the vertical plate portions 34, 34 and the horizontally opposing surfaces of the upper end portion of the mass bracket 30. 46, 46 are formed.

In the mass member 14, the mounting metal fitting 28 is disposed below the fixing metal fitting 12, and the mounting metal fitting 28 is attached.
The central plate portions 32 are positioned below the central plate portion 18 of the fixing bracket 12 with a predetermined distance therebetween, and the two central plate portions 32, 18 are substantially parallel to each other in a state of expanding in a substantially horizontal direction. They are arranged so as to face each other.

Under this arrangement, the central plate portion 32 of the mounting member 28 has the right and left holding plate portions 2 of the fixing member 12.
The lateral plate portions 3 of the support plate portions 33, 33, which are disposed between the facing surfaces of 0 and 20, and which are provided on both left and right sides of the central plate portion 32.
5, 35 are inserted through insertion holes 24, 24 formed in the left and right holding plate portions 20, 20 of the fixing member 12.

Further, the fixing metal fitting 12 and the mounting metal fitting 28 thus separated are elastically connected by the supporting rubber elastic body 16 arranged between the facing surfaces of the central plate portions 18, 32. There is. The supporting rubber elastic body 16 extends between the facing surfaces of the central plate portions 18, 32 with a substantially rectangular outer peripheral shape that is slightly smaller than the facing surfaces of the central plate portions 18, 32, and the upper end surface thereof is fixed. It is vulcanized and adhered to the central plate portion 18 of the metal fitting 12, and the lower end surface of the metal fitting 12 is attached to the mounting metal fitting 28.
It is vulcanized and adhered to the central plate portion 32 of. In short, the support rubber elastic body 16 is formed as an integrally vulcanization molded product having the fixing metal fitting 12 and the mounting metal fitting 28. Further, the support rubber elastic body 16 is formed with a lightening hole 48 which linearly extends in a constant cross section in one horizontal direction (direction perpendicular to the paper surface in FIG. 1) in order to adjust its spring characteristic.

As described above, the dynamic damper 10 having such a structure is mounted in a state of hanging downward from the vibrating member by fixing the fixing member 12 to the vibrating member. In addition, in such a mounted state, the pair of horizontal plate portions 35, 35 has the insertion holes 24, 24.
Inside each of the through-holes 24, the ring-shaped members are positioned so as to be inserted through substantially central portions in the height direction and the length direction, and extend continuously around the entire circumference of each lateral plate portion 35 in each insertion hole 24. A gap 47 is formed. Further, the fixing bracket 1 positioned below the lateral plate portions 35 of the mounting bracket 28.
The two left and right holding plate portions 20, 20 are inserted into the insertion positions while being loosely inserted in the gaps 46, 46 formed between the left and right side surfaces of the mass fitting 30 and the vertical plate portions 34, 34 of the mounting fitting 28. Therefore, abutment of the fixing member 12 with the mass member 14 is avoided. Based on the elastic deformation of the support rubber elastic body 16, the mounting metal fitting 28 and the mass metal fitting 30 are allowed to undergo a predetermined amount of vibration displacement without interfering with the fixing metal fitting 12. Particularly, at the time of inputting a vibration to be normally suppressed in the vibrating member, the spring constant of the supporting rubber elastic body 16, the mass of the mass member 14 and the input of the mass are input so that at least the mass member 14 and the fixing member 12 do not interfere with each other. Considering the magnitude of the generated vibration, etc., the annular gap 4
A size of 7 is set.

Therefore, in the mounted state of the dynamic damper 10, the mass member 14 is elastically suspended from the fixing metal fitting 12 through the supporting rubber elastic body 16, and thus the supporting rubber elastic body is provided. One mass-spring system having 16 as a spring and the mass member 14 as a mass is configured, and this mass-spring system can act as a sub-vibration system 50 for the main vibration system composed of the vibration members. It is like this. Therefore, by adjusting the spring constant of the supporting rubber elastic body 16 and the mass of the mass member 14, the natural frequency of the sub-vibration system 50 is tuned according to the vibration frequency to be isolated in the main vibration system. On the other hand, the effective damping effect of the dynamic damper 10 can be exhibited.

Further, in such a dynamic damper 10, when the supporting rubber elastic body 16 is broken due to some action such as the action of an impacting external force or aging, the supporting rubber elasticity of the mass member 14 and the fixing metal fitting 12 is increased. The connection state by the body 16 is released, and the mass member 14 is separated and independent from the fixing metal fitting 12. In that case, the support plate of the mounting metal fitting 28 inserted into the insertion holes 24 of the fixing metal fitting 12 is inserted. Since the portions 33, 33 are prevented from coming out of the insertion holes 24, 24, the mass member 14 is fixed to the fixing fitting 1.
As a result, the mass member 14 is locked, and the mass member 14 can be prevented from completely falling off the fixing member 12.

In particular, in the dynamic damper having the structure as described above, the left and right lateral plate portions 35, 35 inserted and arranged in the insertion holes 24, 24 are the member dimensions of the central plate portion 32 positioned inward. Is larger than the opening size of the insertion hole 24 in the horizontal direction, and the projecting tips of the lateral plate portions 35, 35 are vertical plate portions 34, 34 bent downward. Horizontal plate 3
It is designed so that the withdrawal of 5, 5 from the insertion holes 24, 24 in the insertion direction is completely prevented. In addition, since the opening portions are not formed on the holding plate portion 20 at the upper and lower sides of the insertion holes 24, 24, the horizontal plate portions 35, 35 do not come out of the insertion holes 24, 24 in the vertical direction. . Furthermore, since no opening is formed on the holding plate portion 20 on one side in the horizontal direction of the insertion hole 24 (on the left side in FIG. 2), the horizontal plate portions 35, 35 are attached to one side in the horizontal direction. It does not come off from the insertion holes 24, 24 on the side of.

After all, the horizontal plate portions 35, 35 are inserted into the insertion holes 24, 2
4, there is a possibility that the opening 26 may be formed on the other horizontal side (right side in FIG. 2) of each insertion hole 24.
It will only be. Here, in the opening 26, as compared with the thickness dimension t of the horizontal plate portion 35, the opening dimension L is
Since they are set to be the same or small, the horizontal plate portions 35, 35 are inserted into the insertion holes 24, 35 even in the horizontal direction.
It is possible to prevent the mass member 14 from coming off, so that an effective fail-safe function of preventing the mass member 14 from completely falling off the fixing member 12 can be exhibited.

In particular, in this embodiment, the opening 26 in each holding plate 20 is formed in the left-right direction orthogonal to the vertical direction, which is the main vibration input direction to be damped, and in addition, the height is increased. Since the mounting member 28 is formed so as to open in the middle portion in the depth direction, when the support rubber elastic body 16 is broken, the mounting metal fitting 28 shifts toward the opening 26 side along the upper and lower peripheral edges of the insertion hole 24. However, it does not reach the opening 26 as it is, and the opening 2 of the mounting bracket 28
The escape from 6 can be prevented more effectively.

Further, in this embodiment, since the opening 26 in each holding plate 20 is opened by a predetermined amount, the holding plate 20 vibrates when the vibration is input and the like. There is no contact between the upper and lower sides that form the contact, and chattering noise and the like caused by such contact does not pose a problem.

Moreover, in this embodiment, the holding plate portions 20 and 20 and the support plate portions 33 and 33 which constitute the fail-safe mechanism in the fixing metal fitting 12 and the mounting metal fitting 28 are all covered with a rubber elastic film or the like. However, since the structure is such that the metal is substantially exposed, when the supporting rubber elastic body 16 is broken and the fail-safe function is exerted as described above, the holding plate of the supporting plate portions 33, 33 is formed. Interference with the portions 20 and 20 is caused by the metal-to-metal contact. As a result, a relatively large noise or vibration occurs,
The user or the inspector can relatively easily recognize or detect the breakage of the supporting rubber elastic body 16, and there is also an advantage that it is possible to promptly deal with such an abnormality. .

By the way, the dynamic damper 10 having the above-described structure can be advantageously manufactured, for example, as follows.

That is, first, the fixing metal fitting 12 and the mounting metal fitting 28 having the above-described specific structure are respectively formed by press working and prepared. Further, the mass metal fitting 30 having the specific structure as described above is separately prepared by casting or the like.

Then, a molding die for molding the supporting rubber elastic body 16 having the specific shape as described above is prepared,
The fixing metal fitting 12 and the mounting metal fitting 28 are provided at predetermined positions in the mold.
After setting, the molding cavity formed between the central plate portions 18 and 32 of the fixing metal fitting 12 and the mounting metal fitting 28 is filled with a predetermined rubber material by injection or the like and vulcanized. By adding, as shown in FIGS. 4 to 5, the integrally vulcanized molded article 5 of the support rubber elastic body 16 is obtained.
Get 2.

In the integral vulcanization molded product 52, the fixing metal fitting 12 and the mounting metal fitting 28 are set in the molding die of the support rubber elastic body 16 in a state of being preliminarily combined so as to have a relative positional relationship in the product. It is arranged by doing. That is, with respect to the insertion holes 24, 24 in the holding plate portions 20, 20 of the fixing fitting 12, those openings 2 are formed.
The supporting plate portions 33, 33 of the mounting bracket 28 formed separately are inserted through 6, 26, and the supporting plate portions 33, 3
The fixing plate 12 and the mounting plate 28 are combined with each other by arranging the horizontal plate portions 35, 35 of 3 in the insertion holes 24, 24 at substantially the center thereof.

Here, the prepared fixing metal fitting 12
As shown in FIG. 5, the lower side portion 54 of each holding plate portion 20 is gradually inclined downward from one end in the length direction toward the other end in the length direction where the opening 26 is formed. do it,
It has an inclined shape that is gradually separated from the upper side portion 56,
Thereby, the opening portion 26 of the holding plate portion 20 is formed in
It is formed with a larger opening size: L'than the product shape shown in FIG. Opening dimension of this opening 26: L '
Is at least the lateral plate portions 35, 35 of the mounting bracket 28.
Is larger than the plate thickness dimension t of the horizontal plate portions 35, 35, so that the horizontal plate portions 35, 35 are inserted through the openings 26, and the insertion holes 24, 2 of the holding plate portions 20, 20 are inserted as described above.
By inserting the support plate portions 33, 33 into 4, the fixing metal fitting 12 and the mounting metal fitting 28 can be assembled to each other.

In addition, tapered corner chamfers 58 are formed on the outer peripheral side corners of the circumferential edge portions of the holding plate portions 20 and 20, which are opposed to each other with the opening 26 interposed therebetween. The outer peripheral end of the opening portion 26 is expanded outward so that the support plate portion 33 can be easily inserted into the opening portion 26. Also,
It is possible that the fixing metal fitting 12 and the mounting metal fitting 28 may be subjected to necessary surface treatments such as rust prevention treatment and adhesion treatment according to a conventionally known treatment technique, either before the combination thereof or simultaneously after the combination. Needless to say.

In this way, the supporting rubber elastic body 16 is vulcanized and demolded as described above between the fixing metal fitting 12 and the mounting metal fitting 28 which are combined with each other.
After obtaining 2, the integral vulcanization molded product 52 is subjected to plastic working using a press working machine or the like. Such plastic working is performed by exerting an external force on the holding plate portions 20, 20 of the fixing member 12 to apply plastic deformation so that the upper and lower side portions 56, 54 are brought closer to each other. By this processing, the upper and lower sides 56, 54 are made substantially parallel, and the opening dimension L of the openings 26, 26 is set to be equal to or smaller than the plate thickness dimension t of the support plate portions 33, 33 of the mounting member 28. ,
The fixing metal fitting 12 has a final shape as shown in FIGS. 1 to 3, in which the mounting metal fitting 28 is prevented from coming off (disengaging) from the fixing metal fitting 12.

Then, the integrally vulcanized molded product 52 thus obtained is then attached to the support plate 3 of the mounting member 28.
3, 33, the mass metal fitting 30 separately formed and prepared as shown in FIGS.
By fixing with, the target dynamic damper 10 is obtained.

Therefore, according to such a manufacturing method, the fixing member 12 and the mounting member constituting a part of the mass member 14 which is directly connected to the fixing member 12 via the supporting rubber elastic body 16. The fail-safe mechanism at the time of breaking the supporting rubber elastic body 16 which can effectively prevent the fixing metal fitting 12 and the mass member 14 from being completely separated by making good use of the metal fitting 28 has a small number of parts and a simple structure. Therefore, it becomes possible to advantageously manufacture the dynamic damper 10 having the above-described structure that can be realized with good manufacturability.

Although one embodiment of the present invention has been described in detail above, this is merely an example, and the present invention is
The specific structure in such an embodiment is not limited in any way, and it can be implemented in a mode in which various changes, modifications, improvements, etc. are added based on the knowledge of those skilled in the art. However, it goes without saying that all are included within the scope of the present invention without departing from the spirit of the present invention.

For example, contrary to the above embodiment, the insertion hole 2
It is also possible to form the holding plate portion 20 provided with 4 on the mounting metal fitting 28 side and form the support plate portion 33 inserted through the insertion hole 24 on the fixing metal fitting 12 side. , Illustrated in FIG. Note that, in FIG. 6, members and parts having the same structure or function as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and thus detailed description will be given. Is omitted.

In the above embodiment, the mass member 14
However, although the support rubber elastic body 16 is composed of the mounting metal fitting 28 and the mass metal fitting 30 which are directly bonded by vulcanization, they may be integrally formed.

Further, it goes without saying that the present invention can be applied to dynamic dampers of various structures used in various devices and members in a wide range of technical fields.

[0059]

As is apparent from the above description, according to the present invention, the fixing member fixed to the vibrating member and the mass member directly connected to the fixing member via the supporting rubber elastic body. The fail-safe mechanism, which can effectively prevent the mass member from completely falling off when the supporting rubber elastic body is broken, is realized with good manufacturability with a small number of parts and a simple structure. Therefore, a dynamic damper having a novel structure can be provided.

[Brief description of drawings]

FIG. 1 is a front view showing a dynamic damper as one embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a plan view of FIG.

FIG. 4 is a front view showing an integrally vulcanized molded product forming the dynamic damper shown in FIG.

5 is a side view of FIG. 4.

FIG. 6 is a front view showing another embodiment of the dynamic damper having the structure according to the present invention.

[Explanation of symbols]

10 Dynamic damper 12 Fixing bracket 14 Mass member 16 Support rubber elastic body 28 Mounting bracket 30 square metal fittings 46 Gap 50 Sub vibration system

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 3D035 CA05 CA21 CA34                 3J048 AA03 BA17 BB06 BD05 BF02                       BF08 BF10 CB27 DA07 EA01

Claims (8)

[Claims] 1. A sub-vibration system for a main vibration system constituted by a vibrating member by elastically connecting and supporting a mass member having a predetermined mass to a fixing member fixed to the vibrating member via a supporting rubber elastic body. A dynamic damper that constitutes a vibration system, wherein an annular holding portion having an insertion hole is formed at a position avoiding a connecting portion by the supporting rubber elastic body on one side of the fixing member and the mass member. In addition, the holding portion is divided at one place on the circumference to form an opening connected to the insertion hole, while the connecting portion by the supporting rubber elastic body on the other side of the fixing member and the mass member. An engaging portion that is inserted through the opening portion of the holding portion and is inserted into the insertion hole of the holding portion and is arranged so as not to slip out in the insertion direction is formed at a position avoiding The engaging part is Is located substantially in the center of the insertion hole while being separated from the portion, and the opening portion of the holding portion is narrowed to a size equal to or smaller than the minimum member size in the insertion portion of the engagement portion into the insertion hole. Dynamic damper characterized by. 2. The flat plate shape of the engaging portion is arranged so as to spread in a direction substantially orthogonal to the main vibration input direction, while the opening size of the opening portion in the holding portion is set to the plate thickness. The dynamic damper according to claim 1, wherein the size is not more than the dimension. 3. The dynamic damper according to claim 1, wherein the opening portion of the holding portion is formed at a position avoiding a facing portion of the holding portion in a main vibration input direction. 4. The holding portion which is provided on one side of the fixing member and the mass member to form the insertion hole, and the holding portion which is provided on the other side of the fixing member and the mass member. 4. A pair of the engaging portions, which are positioned to be inserted through the insertion holes, are formed so as to be positioned on both sides of the supporting rubber elastic body that connects the fixing member and the mass member, respectively. The dynamic damper described in any one. 5. A mounting member, which is directly connected to the fixing member by the supporting rubber elastic body and integrally formed with the engaging portion, and a mounting member formed separately from the mounting member. The dynamic damper according to any one of claims 1 to 4, wherein the mass member is formed by including a mass member that is post-fixed to the. 6. The dynamic damper according to claim 5, wherein both the fixing member and the mounting member are formed by press plate metal fittings. 7. The holding portion which is provided on one side of the fixing member and the mass member to form the insertion hole, and the holding portion which is provided on the other side of the fixing member and the mass member. Of the engaging portion, which is inserted into the insertion hole, is substantially directly contacted with each other when the mass member is separated from the fixing member by the breaking of the supporting rubber elastic body. The dynamic damper according to any one of claims 1 to 6, wherein the dynamic damper is adapted to be brought into contact with the. 8. A sub-vibration system for a main vibration system constituted by a vibrating member by elastically connecting and supporting a mass member of a predetermined mass to a fixing member fixed to the vibrating member via a supporting rubber elastic body. A method for manufacturing a dynamic damper having a vibration system, comprising: a mounting member directly connected to the fixing member via the supporting rubber elastic body; and a mounting member formed separately from the mounting member. The mass member is configured to include a mass member to be fixed afterwards, and the insertion member is opened to the outer peripheral side through an opening formed in one of the fixing member and the attaching member by dividing the mass member. An annular holding portion having a hole is provided, and on the other side of the fixing member and the attachment member, an engaging portion that is inserted into the insertion hole formed in the holding portion so as not to slip out in the insertion direction is provided, The engaging portion The supporting member is inserted into the insertion hole through the opening, the fixing member and the mounting member are positioned to face each other, and the supporting rubber elastic body is vulcanized between the facing surfaces of the fixing member and the mounting member to support the supporting member. A rubber elastic body is vulcanized and adhered to the fixing member and the mounting member to separate the engaging portion from the holding portion so as to be positioned substantially in the center of the insertion hole, while the engaging portion is provided in the insertion hole. After the insertion, the holding portion is plastically deformed to narrow the opening, and after the support rubber elastic body is vulcanized and molded, the mass member is fixed to the mounting member to form the mass member. Characteristic dynamic damper manufacturing method.