JP2003254387A - Dynamic damper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dynamic damper capable of simply performing insertion and fixing by fastening to a vibration body hardly generating the position slippage from the insertion position. <P>SOLUTION: This dynamic damper 10 is composed of first and second vibration absorbing members 11, 21 having cylindrical first and second rubber elastic body fitting parts 12, 22 in which first and second fixing parts 13, 23 are formed on each one end side in the shaft direction; first and second cylindrical mass fittings 18, 28 inserted from the outside into the rubber elastic body fitting parts on each other side in the shaft direction; first and second rubber elastic body supporting parts 14, 24 elastically connecting the rubber elastic body fitting parts and the mass fittings. The first vibration absorbing member and the second vibration absorbing member unite first and second fixing parts, and are inserted into a drive shaft by press fit as one body. First and second vibration absorbing members are fastened with one fixing band 29 fit onto the outer circumferential sides of first and second fixing parts, and fixed to the drive shaft as one body. <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 inserted into an outer peripheral surface of an axial vibrating body such as a drive shaft of a vehicle to damp vibrations generated in the vibrating body, and particularly to two different frequency components. The present invention relates to a dynamic damper capable of attenuating included vibration.

[0002]

2. Description of the Related Art Heretofore, as a dynamic damper of this type, for example, a cylindrical rubber elastic body mounting portion having one end in the axial direction as a fixing portion and an external insertion on the other end side in the axial direction of the rubber elastic body mounting portion. And a rubber elastic body supporting portion that elastically connects between the rubber elastic body mounting portion and the mass metal fitting are known. The dynamic damper is press-fitted onto the outer peripheral surface of the drive shaft, and is fastened to the drive shaft by being tightened by an annular fixing band attached to the fixing portion. This dynamic damper causes compressive deformation of the rubber elastic body support portion due to the resonance action due to the vibration of the mass metal fittings against harmful vibration inputs such as bending vibration and torsional vibration generated by the rotation of the drive shaft. Such a compressive deformation absorbs and attenuates the vibration input. Therefore, the resonance frequency of the dynamic damper is adjusted to the natural frequency component of the vibration input by adjusting the weight of the mass fitting and the material and structure of the rubber elastic body.

By the way, when vibrations of two different frequency components occur in the drive shaft, two dynamic dampers of this type are used. Then, for each dynamic damper, the weight of the mass fitting, the material of the rubber elastic body,
By adjusting the structure, the resonance frequency of each dynamic damper is matched with the natural frequency component of the vibration, and these two dynamic dampers are attached to the drive shaft. As described above, for the vibrations having two different natural frequency components, the resonance frequencies of the two dynamic dampers may be adjusted. Therefore, various kinds of vibrations in which various natural frequency components are combined are generated. Easily compatible with drive shafts.

However, when two different dynamic dampers are used, the step of inserting the dynamic damper into the drive shaft is performed twice, and the fixing member for fixing each dynamic damper to the drive shaft is two.
Required and tightening work twice. As described above, the assembly work time of the dynamic damper increases, and the cost required for the fixing member increases, so that the total cost required for mounting the dynamic damper increases.

On the other hand, for example, JP-A-7-2085
As disclosed in Japanese Patent Publication No. 50, Japanese Patent Application Laid-Open No. 9-14351, etc., a dynamic damper is known in which two mass fittings having different masses are axially separated from each other, and they are connected by a rubber elastic body to be integrated. ing. This dynamic damper is adjusted so that each mass member and a supporting rubber portion provided on the mass member have two resonance frequencies corresponding to vibrations of two different natural frequencies of the drive shaft. However, in the case of this dynamic damper, it is necessary to use a rubber elastic body made of a single material due to manufacturing restrictions. Therefore, in addition to the mass adjustment of the mass metal fittings, in order to adjust to the corresponding two resonance frequencies. , It is necessary to change the structure of the rubber elastic body.

For example, in the case of the dynamic damper disclosed in Japanese Unexamined Patent Publication No. 9-14351, a first support rubber for elastically supporting the first mass member on the vibrating body and a second mass member for elastically supporting the vibrating body. A connecting rubber that integrally connects the second supporting rubber in the axial direction in series and elastically connects the axially facing surfaces of the first mass member and the second mass member is provided, and The shear spring constant is set to be smaller than the support spring constants of the first and second support rubbers in the directions perpendicular to both axes. As described above, the spring constants of the connecting rubber and the supporting rubber must be set to appropriate values by adjusting their structures, so the design of the connecting rubber and the supporting rubber is more complicated than in the case of a single dynamic damper. Therefore, it takes much time and cost to realize the desired spring constant. Further, even if only one resonance frequency is different for the vibrations of the two natural frequency components, it is necessary to change the spring constant of the dynamic damper as a whole, and various kinds of vibrations of various natural frequency combinations are generated. To support the drive shaft of
The design and manufacture of the dynamic damper was very complicated.

Further, in each of the above-mentioned two types of conventional dynamic dampers, an annular fixing member is attached to the rubber elastic body fixing portion, and is fixed to the drive shaft by being compressed and tightened by the fixing member. The change in the diameter of the rubber elastic body causes the rubber elastic body fixing portion to settle, thereby reducing the tightening force of the fixing member. Therefore, there is also a problem that the dynamic damper is likely to be displaced from the prescribed mounting position of the drive shaft.

The present invention is intended to solve the above-described problems, and it is possible to easily damp vibrations of two different natural frequency components generated in a shaft-shaped vibrating body, and to insert and tighten the vibration into the vibrating body. It is an object of the present invention to provide a dynamic damper that can be easily attached and fixed and that is less likely to be displaced from the mounting position on the vibrating body.

[0009]

In order to achieve the above object, the structural feature of the invention according to claim 1 is that the axial one end side is a first fixing portion, and the axial vibrating body is A cylindrical first rubber elastic body mounting portion that is press-fitted onto the outer peripheral surface of the first rubber elastic body, and a cylindrical first mass metal fitting that is externally inserted to the other axial end of the first rubber elastic body mounting portion, 1 Rubber elastic body mounting part and 1st
A first anti-vibration member including a first rubber elastic body supporting portion that elastically connects the mass metal fittings, and a tubular second rubber elastic body mounting portion whose one end in the axial direction is a second fixing portion. A cylindrical second mass fitting externally inserted on the other end side in the axial direction of the second rubber elastic body mounting portion, and a second rubber elastically connecting the second rubber elastic body mounting portion and the second mass fitting. A dynamic damper including an elastic body supporting portion and a second vibration isolating member fitted and fixed to an outer peripheral surface of the first fixing portion of the first vibration isolating member by a second rubber elastic body attaching portion. Then, in a state where the first vibration isolation member is inserted and fitted in the vibration body, the vibration body is fixed to the vibration body by the fixing member attached to the outer peripheral surface of the second fixing portion of the second vibration isolation member fixed to the first vibration isolation member. It is to be fastened and fixed together.

According to the invention of claim 1 configured as described above, the dynamic damper is composed of two different first and second vibration isolation members, but the second vibration isolation member is the first vibration isolation member. Since they are fitted and fixed to the first fixing portion of the member, they can be integrally pressed into the vibrating body. Therefore, the work of inserting the dynamic damper into the vibrating body can be easily performed at once.

Further, the dynamic damper has two different
The first and second anti-vibration members, but the second anti-vibration member is fitted and fixed to the first fixed part of the first anti-vibration member. Attached to
The first fixing portion and the second fixing portion can be integrally fastened to the vibrating body by the single fixing member. Therefore, in this dynamic damper, the number of fixing members can be reduced as compared with the conventional one, and the fastening and fixing work can be performed only once. Further, the first fixing portion and the second fixing portion are integrally fastened to the vibrating body by the fixing member mounted on the outer peripheral side of the second fixing portion, so that the close contact portions of the first and second fixing portions press each other. Since it deforms to fit, the friction coefficient of the contact portion is greatly increased. Therefore, even if the first fixing part and the second fixing part are settled due to aging, the tightening force by the fixing member is secured, and the displacement of the dynamic damper from the mounting position on the vibrating body is prevented. .

Further, the dynamic damper is integrated by fitting the second vibration isolating member to the first fixing portion of the first vibration isolating member, but it is originally two different first vibration isolating members.
And the second vibration isolating member, the materials and structures of the rubber elastic bodies of the vibration isolating members are respectively adapted to the vibrations of the shaft-shaped vibrating body to be damped at two different natural frequencies. It can be adjusted separately. Therefore, it is possible to easily realize an appropriate resonance frequency for each of the first and second vibration isolation members, as compared with a conventional integrated dynamic damper in which two mass metal fittings are integrated by a rubber elastic body. In addition, by preparing the first and second anti-vibration members having different resonance frequencies, this dynamic damper is adapted to various kinds of vibrating bodies having different combinations of natural frequencies. By combining the first and second anti-vibration members having the resonance frequencies described above, it is possible to easily cope with them.

[0013] Further, the structural feature of the invention of claim 2 is that the first cylindrical portion has one end side in the axial direction as a first fixing portion.
A rubber elastic body mounting portion, a cylindrical first mass fitting externally inserted on the other end side in the axial direction of the first rubber elastic body mounting portion, and an elastic portion between the first rubber elastic body mounting portion and the first mass fitting. A first anti-vibration member having a first rubber elastic body support portion connected to the first rubber elastic body support portion, a tubular second rubber elastic body attachment portion whose one end in the axial direction is a second fixing portion, and a second rubber elastic body. A cylindrical second mass metal fitting that is externally inserted to the other end side in the axial direction of the mounting portion, and a second rubber elastic body support portion that elastically connects the second rubber elastic body mounting portion and the second mass metal fitting. A dynamic damper comprising a second vibration isolating member provided, wherein the first vibration isolating member and the second vibration isolating member are of a shaft-like vibrating body with the first fixing part side and the second fixing part side being aligned. The first fixing portion and the second fixing portion have an overlapping portion extending in the axial direction when projected from a direction perpendicular to the axis in a state where the first fixing portion and the second fixing portion are inserted into the outer peripheral surface by press fitting. Ri is to be fastened integrally to the vibrating body by a fixing member mounted on the outer peripheral side of the first and second fixing portions.

In the invention of claim 2 configured as described above, the dynamic damper is composed of two different first and second vibration isolation members, but the first and second vibration damping members are different.
Since it is possible to press-fit the anti-vibration member integrally with the first fixing part side and the second fixing part side to the outer peripheral surface of the shaft-shaped vibrating body, compared to the case where separate dynamic dampers are press-fitted into the vibrating body respectively. As a result, the work of inserting and fitting the dynamic damper into the vibrating body is reduced.

Further, the dynamic damper has two different
A first fixing part and a second fixing part, each of which has an overlapping part extending in the axial direction when projected from a direction perpendicular to the axis in a state of being fitted into the vibrating body. The two fixing parts can be integrally fastened to the vibrating body by one fixing member. Therefore, in this dynamic damper, the number of fixing members can be reduced as compared with the conventional one, and the fastening and fixing work can be performed only once.
Further, the first fixing portion and the second fixing portion are integrally fastened to the vibrating body by the fixing member mounted on the outer peripheral side of the first fixing portion and the second fixing portion, so that the contact portions of the both are deformed so as to press each other. The friction coefficient at the contact portion of the second fixed portion is increased. As a result, even if the first fixing portion and the second fixing portion are settled due to aging, the tightening force by the fixing member is secured, and the displacement of the dynamic damper from the mounting position in the vibrating body is prevented.

Further, the dynamic damper has two different
The first and second anti-vibration members are integrated in a state of being inserted into the vibrating body, but since they are originally composed of two different first and second anti-vibration members, The materials and structures of the rubber elastic bodies of both the vibration isolating members can be adjusted separately for vibrations of two different natural frequencies of a shaft-shaped vibration body. Therefore, it is possible to easily realize an appropriate resonance frequency for each of the first and second vibration isolation members, as compared with a conventional integrated dynamic damper in which two mass fittings are integrated by a rubber elastic body. Further, by preparing the first and second anti-vibration members having different resonance frequencies, resonance frequencies suitable for various types of vibrating bodies having different combinations of natural frequencies can be obtained. By combining the first and second anti-vibration members, it is possible to easily cope with them.

The feature of the invention according to claim 3 is that in the dynamic damper according to claim 2, the first vibration isolation member and the second vibration isolation member are press-fitted into the vibrating body. In the state, the first fixing portion and the second fixing portion are in close contact with each other in the radial direction. With such a configuration, in a state in which the first vibration isolation member and the second vibration isolation member are inserted into the shaft-shaped vibrating body by press fitting, projection on the first fixing portion and the second fixing portion from a direction perpendicular to the axis. There may be an axially extending overlap portion at.

Further, the constitutional feature of the invention of claim 4 is that, in the dynamic damper according to claim 2, the first fixing portion and the second fixing portion are the first rubber elastic body attaching portion and the second rubber elastic body attaching portion. The first fixing portion is a rubber elastic body mounting portion that projects in the axial direction from a part of the circumferential direction, and in which the first vibration isolating member and the second vibration isolating member are inserted into the vibrating body by press fitting. And the second fixing portion is continuous in the circumferential direction.
With such a configuration, in a state in which the first vibration isolation member and the second vibration isolation member are inserted into the shaft-shaped vibrating body by press fitting, projection on the first fixing portion and the second fixing portion from a direction perpendicular to the axis. There may be an axially extending overlap portion at.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 show a dynamic damper 10 attached to a drive shaft (axial vibrator) S of an automobile according to the first embodiment by a sectional view and a right side view at an axial position. Also,
FIG. 3 is a sectional view and a right side view of the first anti-vibration member constituting the dynamic damper 10 at the axial position, and FIG.
[Fig. 2] is a cross-sectional view and a right side view of the second vibration isolating member constituting the dynamic damper 10 at the axial position. The dynamic damper 10 includes a first vibration isolation member 11,
The second vibration isolation member 21 fitted and fixed to the first fixing portion 12
It is composed of and.

As shown in FIG. 3, the first anti-vibration member 11 is
The cylindrical first rubber elastic body mounting portion 12 and the axially other end side (the right side in the drawing) of the first rubber elastic body mounting portion 12 are radially spaced from the outer peripheral surface and are arranged so as to surround the outer side. The installed cylindrical first mass metal fitting 18, the first rubber elastic body mounting portion 12, and the first
The first rubber elastic body support portion 14 that elastically connects the mass fittings 18 and the thin rubber coating layer 16 that covers the surface of the first mass fitting 18 are provided.

The first rubber elastic body mounting portion 12 is cylindrical and has one end side in the axial direction (the left side in FIG. 3A), and the second vibration isolating member 21 is fitted and fixed to the outer peripheral surface thereof. Mounting groove 1
It is the first fixing portion 13 provided with 3a. That is,
The axial length of the mounting groove 13a is substantially the same as the axial length of a second rubber elastic body mounting portion 22 of the second vibration isolating member 21 described later, and the outer diameter thereof is the second rubber elastic body mounting portion 22. It is slightly larger than the inner diameter of the shaft hole. On the other end side (right side in FIG. 1) of the first rubber elastic body mounting portion 12, the first mass fitting 1
8 are arranged coaxially at a distance radially outward from the outer peripheral surface thereof.

The first mass metal fitting 18 is a thick metal fitting having a length approximately equal to the axial length of the other end side of the first rubber elastic body mounting portion 12, and has an outer circumference on the other end side in the axial direction. The surface is notched toward the other end to form a conical surface. The first mass member 18 is formed by a cold or hot forging method, a sintered metal method, a press winding method, or the like. The forged product is not particularly limited in material, and for example, carbon steel or the like is adopted, and the same applies to both cold and hot forging. Further, as the forged product, a product whose scale has been removed by shot blasting or the like is used. As the sintered metal product, a pure iron-based product, an iron-carbon-based product, an iron-copper-based product, or the like is appropriately selected and used according to the usage conditions. The press-rolled product is a thick plate formed by press-molding and has both ends in the circumferential direction contacted by roll-molding, and the contact ends may be adhered or left unbonded. The first mass metal fitting may be provided with a through hole in a part thereof. As a result, by connecting the rubber elastic bodies on the inner peripheral surface side and the outer peripheral surface side of the mass fitting with the rubber elastic body filled in the through holes, the mass fitting and the rubber elastic body are strongly integrated.

The first rubber elastic body supporting portion 14 is extended radially outward at the other axial end of the first rubber elastic body mounting portion 12, and the inner peripheral surface of the first mass metal fitting 18 and the shaft thereof. Contact is made at the middle position in the direction. The first rubber elastic body support portions 14 connect the first mass metal fittings 18 and the first rubber elastic body attachment portions 12 with each other.
The main connecting portion 15a and the thin connecting portion 15b are formed in an annular shape.

Each of the main connecting portions 15a is in the shape of a substantially quadrangular prism that is thick in the axial direction and the width direction, and extends radially outward from five locations on the outer peripheral surface of the rubber elastic body mounting portion 12 at equal intervals in the circumferential direction. It has been extended. Each thin wall connecting portion 15b has a thin film shape,
The main connecting portions 15a are connected by extending in the circumferential direction. In addition, at the intermediate position in the circumferential direction of each thin connecting portion 15b, the first
A rubber convex portion 15c slightly protruding from the mass metal fitting 18 side is provided. The rubber convex portion 15c is the first mass fitting 18
It functions as a stopper that restricts the radial movement of the. The main connecting portion 15a and the thin connecting portion 15b
The number of is not limited to the above five.

Further, the thin rubber coating layer 16 covers substantially the entire inner peripheral surface, both end surfaces and the outer peripheral surface of the first mass fitting 11, and is integrated with the rubber elastic body supporting portion 14.
On one end side in the axial direction of the rubber coating layer 16, there are provided recessed portions 16a having no rubber elastic body at four positions at equal intervals in the circumferential direction on the inner peripheral side of the end portion. The thin portion 16a is the first mass fitting 11
Is a portion corresponding to a positioning protrusion provided on the mold for positioning in the mold for vulcanization molding described later.

The first rubber elastic body mounting portion 12, the first rubber elastic body supporting portion 14, and the rubber coating layer 16 are made of a rubber material in the mold with the first mass metal fitting 18 set in the mold. It is integrally formed by vulcanization molding in which it is injected and heat-treated at a high temperature, whereby the first vibration isolation member 11 is obtained. Regarding the rubber material forming the first rubber elastic body mounting portion 12, the first rubber elastic body supporting portion 14, and the rubber coating layer 16, together with the mass of the first mass metal fitting 18, the first vibration damping device 21.
Is a factor that determines the resonance frequency of. The rubber material is appropriately selected together with the mass fitting so that the resonance frequency becomes equal to the first natural frequency of the vibration damped by the first vibration isolation device 21.

The second anti-vibration member 21, as shown in FIG.
Similar to the first anti-vibration member 11, the tubular second rubber elastic body mounting portion 22 and the second rubber elastic body mounting portion 22 on the other axial end side (right side in the drawing) are radially extended from the outer peripheral surface thereof. Cylindrical second mass fitting 28 arranged to surround the outside thereof with a distance
A second rubber elastic body support portion 24 that elastically connects the second rubber elastic body attachment portion 22 and the second mass fitting 28, and a thin rubber coating layer 26 that covers the surface of the second mass fitting 28. Is equipped with.

The second rubber elastic body mounting portion 22 is a cylindrical mounting groove 23a in which one end side in the axial direction (left side in FIG. 4) is fitted with an annular fixing band (fixing member) 29 on its outer peripheral surface.
It is the second fixing portion 23 provided with. On the other end side (the right side in FIG. 1) of the second rubber elastic body mounting portion 22, a second mass metal fitting 28 is coaxially arranged at a distance from the outer peripheral surface thereof. The second mass metal fitting 28 is a cylindrical metal fitting that is approximately half the axial length of the second rubber elastic body mounting portion 22, has a larger diameter than the first mass metal fitting 18, and is thin and lightweight. The same applies to the first mass fitting 18.

The second rubber elastic body supporting portion 24 is similar to the first rubber elastic body supporting portion 14 in that the second rubber elastic body mounting portion 2 is provided.
The second end of the second metal fitting 28 extends radially outward at the other end in the axial direction and is in contact with the inner peripheral surface of the second mass member 28 at an intermediate position in the axial direction. The second rubber elastic body support portion 24 includes a second metal fitting 28 and a second metal fitting 28.
Each of the five main connecting portions 2 connecting the rubber elastic body attaching portions 22
5a and the thin connecting portion 25b form an annular shape. Main connecting portion 25a, thin connecting portion 25b and rubber convex portion 2
5c, the main connecting portion 15a, the thin connecting portion 15
The structure is substantially the same as that of the b and the rubber convex portion 15c.

The thin rubber coating layer 26 covers substantially the entire inner peripheral surface, both end surfaces and the outer peripheral surface of the second mass member 28, and is integrated with the second rubber elastic body supporting portion 24. There is. At both ends in the axial direction of the rubber coating layer 26, recessed portions 26a having no rubber elastic body are provided at four positions on the outer peripheral side at equal intervals in the circumferential direction. The wall thickness part 26a is the second mass metal fitting 2
8 is a portion corresponding to a positioning protrusion provided on the mold for positioning 8 on the mold for vulcanization molding described later.

The second rubber elastic body attaching portion 22, the second rubber elastic body supporting portion 24, and the rubber coating layer 26 are formed by placing a rubber material in the mold with the second mass metal fitting 28 set in the molding die. It is integrally formed by vulcanization molding in which it is injected and heat-treated at a high temperature, whereby the second vibration isolating member 21 is obtained. Regarding the rubber material forming the second rubber elastic body mounting portion 22, the second rubber elastic body supporting portion 24, and the rubber coating layer 26, the second vibration isolator 21 together with the mass of the second mass fitting 28.
Is a factor that determines the resonance frequency of. The rubber material is appropriately selected together with the second mass fitting so that the resonance frequency becomes equal to the second natural frequency of the vibration damped by the second vibration isolator 21.

The first and second anti-vibration members 11 and 21 manufactured separately as described above have the second anti-vibration member 21 attached to the first fixing portion 13 of the first anti-vibration member 11. Groove 13
The second anti-vibration member 21 is fixed to the first fixing portion 13 by being inserted into the “a”. In this way, the second anti-vibration member 2
The first vibration isolation member 21 in which 1 is attached and integrated,
The drive shaft S of the vehicle, to which the press-fitting liquid has been applied, is fitted onto the outer periphery of the drive shaft S of the vehicle manually or by press-fitting with a jig, and is fixed at the first rubber elastic body mounting portion 12. Next, the fixing band 29 is mounted in the mounting groove 23a of the second fixing portion 23, and the fixing band 29 is tightened, whereby the second fixing portion 23 and the first fixing portion 13 are integrally fixed to the drive shaft S.

As described above, the dynamic damper 10 includes two different first and second vibration isolation members 11,
The second vibration isolation member 21 is the first
Since it is fitted and fixed to the first fixing portion 13 of the vibration isolator 11,
Both can be pressed into the drive shaft S as a unit. Therefore, the work of inserting the dynamic damper 10 into the drive shaft S can be easily performed at once, and the load of the work of inserting the dynamic damper 10 can be reduced as compared with the related art.

Further, the dynamic damper 10 is composed of two different first and second vibration isolating members 11 and 21, but the second vibration isolating member 21 is the first fixing portion of the first vibration isolating member 11. Since it has a structure in which it is fitted and fixed to 13, the first fixing portion 13 and the second fixing portion 23 can be integrally fastened to the drive shaft S by one fixing band 29 attached to the outer periphery of the second fixing portion 23. it can. Therefore, in the dynamic damper 10, the number of the fixing bands 29 can be reduced as compared with the conventional one, and the tightening and fixing work can be reduced to one.
It can be done only once. As a result, the cost for mounting the dynamic damper 10 on the drive shaft S is significantly reduced.

Further, the first and second fixing portions 13 and 23
Is integrally fastened to the drive shaft S by the fixing band 29 mounted on the outer peripheral side of the mounting groove 23a of the second fixing portion 23, whereby the close contact portions of the first and second fixing portions 13 and 23 are pressed against each other and deformed. Therefore, the friction coefficient of the close contact portion is greatly increased. Therefore, even if the first and second fixing portions 13 and 23 are settled due to changes over time, the tightening force of the fixing band 29 is secured, and the displacement of the dynamic damper 10 from the mounting position on the drive shaft S is surely ensured. To be prevented.

Further, since the dynamic damper 10 is composed of two different first and second vibration-damping members 11 and 21, two parts of the drive shaft S, which is a vibration-damping target, are used.
Anti-vibration member 1 against two different natural frequencies
This can be easily dealt with by separately adjusting the mass of the metal fittings 1 and 21 and the material and structure of the rubber elastic body. Therefore, it is possible to easily realize an appropriate resonance frequency for each of the first and second vibration isolation members 11 and 21 as compared with a conventional integrated dynamic damper in which two mass metal fittings are integrated by a rubber elastic body. . Furthermore, by preparing the first and second anti-vibration members 11 and 21 having different resonance frequencies, it is possible to prepare various kinds of drive shafts S that generate vibrations having different combinations of natural frequencies. By combining the first and second anti-vibration members 11 and 21 having a resonance frequency suitable for this, it is possible to easily cope with them. As a result, the dynamic damper 1
0 is for the mass metal fitting 1 for the vibration input of two different natural frequencies generated with the rotation of the drive shaft S.
Due to the resonance action of the vibrations of 8 and 28, the rubber elastic body supporting portions 14 and 24 are mainly compressed and deformed, and the vibration inputs of two kinds of natural frequencies are absorbed and effectively damped. You can

Next, a second embodiment will be described with reference to the drawings. 5 and 6 show the dynamic damper 30 according to the second embodiment by a sectional view and a right side view at the axial position. Further, FIG. 7 is a cross-sectional view of the first anti-vibration member 31 and the second anti-vibration member 41, which form the dynamic damper 30, taken along the axial line position. The dynamic damper 30 is composed of a first vibration isolating member 31 and a second vibration isolating member 41 in which a second fixing portion 43 is fitted onto the outer peripheral surface of the first fixing portion 33 in a close contact state.

As shown in FIG. 7A, the first vibration isolation member 31 has a tubular first rubber elastic body mounting portion 32 and the other axial end of the first rubber elastic body mounting portion 32 (shown in the figure). On the right side), between the cylindrical first mass metal fitting 38, which is arranged so as to surround the outer side at a distance from the outer peripheral surface in the radial direction, and between the first rubber elastic body mounting portion 32 and the first mass metal fitting 38. Is provided with a first rubber elastic body support portion 34 that elastically couples with each other, and a rubber coating layer 36 that covers the surface of the first mass fitting 38. First vibration isolation member 31
Has basically the same structure as the first vibration isolation member 11,
The length of the first fixing portion 33 on the one end side of the first rubber elastic body attaching portion 32 is shortened to approximately half of the whole, and the outer diameter thereof is slightly smaller than the outer diameters of the other portions. Are different. First rubber elastic body supporting portion 34, rubber coating layer 36
The first mass fitting 38 has the same structure as the corresponding part of the first vibration isolator 11.

Further, as shown in FIG. 7B, the second vibration isolation member 41 has substantially the same structure as the first vibration isolation member 31,
The cylindrical second rubber elastic body mounting portion 42 and the cylindrical second rubber elastic body mounting portion 42, which is arranged at one end side (left side in the drawing) in the axial direction of the second rubber elastic body mounting portion 42 so as to surround the outer circumferential surface thereof at a radial distance. Mass metal fitting 48
A second rubber elastic body support portion 44 that elastically connects the second rubber elastic body mounting portion 32 and the second mass fitting 48, and a rubber coating layer 46 that covers the surface of the second mass fitting 48. ing. The second anti-vibration member 41 includes the second rubber elastic body mounting portion 42.
A step 43b is provided on the inner peripheral surface side of the boundary between the other end side second fixing portion 43 and the one end side, and the inner diameter of the second fixing portion 43 is larger than the inner diameter on the one end side. The inner diameter of the second fixing portion 43 is slightly smaller than the outer diameter of the first fixing portion 33. The other parts of the second anti-vibration member 41 are the first
It has the same structure as the corresponding portion of the vibration isolator 31. However, the structures of the first anti-vibration member 31 and the second anti-vibration member 41 are almost the same, but the material and hardness of the rubber elastic body are changed, and two types of vibration from the drive shaft are used. Each resonance frequency is adjusted so as to match the natural vibration frequency of the.

In the second embodiment, the two first and second anti-vibration members 31 and 41 which are different from each other are integrated by inserting the first fixing portion 33 into the second fixing portion 43 by press fitting. As a result, the first and second vibration isolation members 31, 41 can be integrally press-fitted into the drive shaft S. Therefore, the insertion work of the dynamic damper 30 becomes easy,
The time and effort of the insertion work are reduced. However, instead of such a method of inserting the dynamic damper 30 into the drive shaft S, the insertion and insertion work is slightly increased, but the first and second vibration isolation members 31 and 41 are separately attached to the drive shaft S. Press-fit and mount the first fixing portion 33 on the drive shaft S.
It is also possible to fit the second fixing portion 43 to. In addition, in the first fixing portion 33 and the second fixing portion 43 that overlap each other on the drive shaft S,
By mounting and fastening the fixing band 29 in the mounting groove 43a of the fixing portion 43, the dynamic damper 30 can be tightened integrally with the drive shaft S.
Only one fixing band 29 is required. As described above, also in the second embodiment, the number of the fixing bands 29 can be reduced as compared with the conventional one, and the tightening and fixing work can be performed only once, so that the dynamic damper 30 is attached to the drive shaft S. The cost for doing so is significantly reduced.

Further, the first and second fixing portions 13 and 23
Is integrally fastened to the drive shaft S by the fixing band 29 mounted on the outer peripheral side of the mounting groove 23a of the second fixing portion 23, so that the close contact portions of the first and second fixing portions 13 and 23 press each other. Due to the deformation, the coefficient of friction of the contact portion is greatly increased. Therefore, even if the first and second fixing portions 13 and 23 are settled due to a change with time, the fastening force by the fixing band 29 is secured, and the displacement of the dynamic damper 10 from the mounting position on the drive shaft S is prevented. Certainly prevented.

Also in the second embodiment, the two different first and second vibration isolating members 31 and 41 prevent the drive shaft S from vibrating at two different natural frequencies. Compared with a dynamic damper, it is possible to easily realize a proper resonance frequency, and to prevent various kinds of drive shafts S having various different combinations of natural frequencies, the first and second protection frequencies of the resonance frequency adapted to the drive shaft S. The fact that it can be easily dealt with by combining the vibrating members 31 and 41 is the same as in the first embodiment.

Next, a third embodiment will be described with reference to the drawings. 8 and 9 show the dynamic damper 50 according to the third embodiment by a sectional view and a right side view at the axial position. Further, FIG. 10 is a cross-sectional view of the first vibration-proof member 51 and the second vibration-proof member 61, which constitute the dynamic damper 50, taken along the axial line position. The dynamic damper 50 is composed of a first vibration isolating member 51 and a second vibration isolating member 61 that are engaged with the first fixing portion 53 and the second fixing portion 63 and have substantially the same configuration.

As shown in FIG. 10, the first anti-vibration member 51 includes a tubular first rubber elastic body mounting portion 52 and the axially other end side (right side in the drawing) of the first rubber elastic body mounting portion 52 in the radial direction from the outer peripheral surface thereof. Cylindrical first mass fitting 5 arranged to surround the outside with a distance.
8, a first rubber elastic body mounting portion 52 and a first rubber elastic body support portion 54 that elastically connects the first mass metal fitting 58, and
A rubber elastic body covering portion 56 for covering the surface of the mass metal fitting 58 is provided. The first anti-vibration member 51 has substantially the same structure as the first anti-vibration member 31, and has a semi-cylindrical shape in which the first fixing portion 53 on one end side of the first rubber elastic body attachment portion 52 is only half in the circumferential direction. Is different from the first fixing portion 33, and the other first rubber elastic body supporting portion 54, the rubber coating insertion 56, and the first mass metal fitting 58 are the same as the first vibration isolating member 31.
It has the same structure as the corresponding part of. The second vibration isolation member 61 includes a second rubber elastic body mounting portion 62, a second rubber elastic body supporting portion 64, a rubber elastic body covering portion 66, and a second mass metal fitting 68.
Both have the same structure as the first vibration isolation member 51. However, the first
With respect to the vibration isolator 51 and the second vibration isolator 61, the material, hardness, etc. of the rubber elastic body have been changed, and the vibration isolator 51 and the second vibration isolator 61 are respectively changed in accordance with the natural vibration frequencies of two kinds of vibrations from the drive shaft S. The resonance frequencies are adjusted to be different.

In the third embodiment, the two different first and second anti-vibration members 51 and 61 are attached to the first fixing portion 53 and the second fixing portion 63 in the circumferential direction in close contact with each other. The first and second vibration isolation members 31 and 41 are integrally inserted into the drive shaft S by press fitting. As described above, the work of inserting and inserting the dynamic damper 10 into the drive shaft S is performed at one time, so that the load of the work of inserting and fitting is reduced. However, in the present embodiment, since the first fixing portion 53 and the second fixing portion 63 are not fixed to each other, the effect of press-fitting into the drive shaft S integrally is as compared with the above first and second embodiments. Few. In addition,
Instead of such a method of inserting the dynamic damper 50 into the drive shaft S, two different first and second different dampers are used.
The anti-vibration members 51 and 61 are separately press-fitted into the drive shaft S, and the first fixing portions 33 protruding from each other on the drive shaft S are engaged with the second fixing portions 43 so as to be alternately arranged in the circumferential direction. It is also possible to do so, and there is little difference in the labor required for the work with the above method.

Further, by fixing and fixing the fixing band 29 in both mounting grooves 53a, 63a of the first fixing portion 53 and the second fixing portion 63, which are continuously arranged on the drive shaft S in the circumferential direction, Since the dynamic damper 50 can be integrally fastened and fixed to the drive shaft S, only one fixing band 29 is required. in this way,
Also in the third embodiment, the fixing band 29 is different from the conventional one.
Since the number of screws can be reduced and the fastening work can be done only once, the dynamic damper 50
The cost for mounting the drive shaft on the drive shaft S is significantly reduced.

Further, the fixing band 2 mounted on the outer peripheral side of the mounting grooves 53a, 63a of the first and second fixing portions 53, 63.
By integrally tightening the drive shaft S by means of 9, the portions of the first and second fixing portions 53, 63 that are in close contact with each other in the circumferential direction are deformed so as to press each other, so that the friction coefficient of the close contact portion is significantly increased. To be Therefore, even if the first and second fixing portions 53 and 63 are settled due to changes over time, the tightening force of the fixing band 29 is secured, and the displacement of the dynamic damper 50 from the mounting position on the drive shaft S is prevented. Certainly prevented.

Also in the third embodiment, the two different first and second vibration isolation members 51, 61 are used to prevent the drive shaft S from vibrating at two different natural frequencies. As compared with a dynamic damper, it is possible to easily realize a proper resonance frequency and to combine various different natural frequencies with the drive shaft S.
First and second anti-vibration members 3 having resonance frequencies adapted to this
The point which can be easily dealt with by combining 1 and 41 is the same as that of the said 1st Embodiment.

In the third embodiment, the first
Each of the fixing portion 53 and the second fixing portion 63 has a semi-cylindrical shape, but the invention is not limited to this, and each of them may be formed of a plurality of arc plate-shaped projecting pieces. Then, with the first and second fixing portions 53 and 63 inserted into the drive shaft, the respective protruding pieces may be continuous in the circumferential direction.

In each of the above embodiments, the dynamic damper is applied to reduce the vibration of the drive shaft of the vehicle, but it can be applied to other similar applications. In addition, the dynamic damper shown in the above embodiment is an example, and can be implemented in various forms without departing from the gist of the present invention.

[0051]

According to the present invention, two different first and second anti-vibration members can be integrally press-fitted into the vibrating body by combining the first fixing portion and the second fixing portion respectively. The work of inserting the damper into the shaft-shaped vibrating body becomes easy. Further, according to the present invention, the first fixing portion and the second fixing portion, which are overlapped with each other or have an overlapping portion extending in the axial direction in the projection from the direction perpendicular to the axis, are provided with one fixing band. Can be integrally fixed to. As a result, in the present invention, the number of fixing bands can be reduced, and the fastening and fixing work can be completed only once, so that the cost for mounting the dynamic damper on the shaft-shaped vibrating body is significantly reduced. To be done.

Further, since the first fixing portion and the second fixing portion are overlapped with each other or have an overlapping portion extending in the axial direction when projected from the direction perpendicular to the axis, the fixing mounted on the outer peripheral side is fixed. By integrally tightening the vibrating body with the band, the contact portions of the two are deformed so as to press each other, and the friction coefficient of the contact portions is increased. Therefore, in the present invention, the first fixing portion and the second fixing portion are
Even if the fatigue occurs due to aging, the tightening force is secured at night and the displacement of the dynamic damper from the mounting position in the vibrating body is prevented.

Further, according to the present invention, the dynamic damper is integrated in a state of being fitted into the vibrating body.
Since it is composed of two different first and second anti-vibration members, by changing the combination of each rubber elastic body with respect to the vibration of two different natural frequencies of the vibrating body, two mass metal fittings can be obtained. It is possible to easily realize an appropriate resonance frequency for each of the first and second anti-vibration members, as compared with a conventional integrated dynamic damper in which the rubber elastic body is integrated. Further, by preparing the first and second anti-vibration members having different resonance frequencies, this dynamic damper can be applied to various kinds of vibrating bodies having various combinations of different natural frequencies. First of the matched resonance frequency
It is possible to easily cope with this by combining the second vibration isolation member and the second vibration isolation member.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a dynamic damper according to a first embodiment of the present invention at an axial position.

FIG. 2 is a right side view showing a dynamic damper.

3A and 3B are a cross-sectional view and a side view at a position of an axial line showing a first vibration isolation member that constitutes a dynamic damper.

4A and 4B are a cross-sectional view and a side view at a position of an axial line showing a second vibration isolation member that constitutes a dynamic damper.

FIG. 5 is a sectional view of the dynamic damper according to the second embodiment at the axial position.

FIG. 6 is a side view showing the dynamic damper.

FIG. 7 is a cross-sectional view showing a first anti-vibration member and a second anti-vibration member that form the same dynamic damper, taken along the axial line.

FIG. 8 is a cross-sectional view showing a dynamic damper according to a third embodiment at an axial position.

FIG. 9 is a side view showing the dynamic damper.

FIG. 10 is a cross-sectional view showing a first anti-vibration member and a second anti-vibration member that form the same dynamic damper, taken along the axial line.

[Explanation of symbols]

10 ... Dynamic damper, 11 ... First anti-vibration member, 12
... 1st rubber elastic body attachment part, 13 ... 1st fixing part, 14 ... 1st rubber elastic body support part, 15a ... Main connection part, 15b ... Thin connection part, 18 ... 1st mass metal fittings, 21 ... 2nd prevention Swing member, 2
2 ... 2nd rubber elastic body attachment part, 23 ... 2nd fixing part, 24 ...
2nd rubber elastic body support part, 25a ... main connection part, 25b ... thin connection part, 28 ... 2nd mass metal fittings, 29 ... fixed band, 3
0 ... Dynamic damper, 31 ... First vibration isolation member, 41 ...
Second anti-vibration member, 50 ... Dynamic damper, 51 ... First
Anti-vibration member, 61 ... Second anti-vibration member, S ... Drive shaft.

Claims (4)

[Claims] 1. A cylindrical first rubber elastic body mounting portion, which has one end in the axial direction as a first fixing portion and is press-fitted into an outer peripheral surface of a shaft-shaped vibrating body, and the first rubber elastic body. A cylindrical first mass fitting externally inserted on the other end side in the axial direction of the body mounting portion, and a first rubber elastic body support that elastically connects the first rubber elastic body mounting portion and the first mass fitting. And a cylindrical second rubber elastic body mounting portion whose one end in the axial direction is a second fixing portion, and the other end side in the axial direction of the second rubber elastic body mounting portion. A second rubber elastic body supporting portion that elastically connects the second rubber elastic body mounting portion and the second rubber elastic body mounting portion, the second rubber elastic body supporting portion elastically connecting between the second rubber elastic body mounting portion and the second rubber elastic body mounting portion. A dynamic damper configured by a second vibration isolating member fitted and fixed to an outer peripheral surface of a first fixing portion of the first vibration isolating member by an elastic body attaching portion, With the vibration isolating member inserted into the vibrating body, the vibrating body is fixed to the vibrating body by a fixing member mounted on the outer peripheral surface of the second fixing portion of the second vibration isolating member fixed to the first vibration isolating member. A dynamic damper characterized by being clamped and fixed together. 2. A tubular first rubber elastic body mounting portion having one end in the axial direction as a first fixing portion, and a tubular shape externally inserted to the other axial end of the first rubber elastic body mounting portion. First mass metal fitting of
A first anti-vibration member including the first rubber elastic body mounting portion and a first rubber elastic body support portion that elastically connects between the first mass fittings, and one end side in the axial direction serves as a second fixing portion A cylindrical second rubber elastic body mounting portion, a cylindrical second mass fitting externally inserted on the other axial end side of the second rubber elastic body mounting portion, and the second rubber elastic body mounting portion A dynamic damper including a second vibration isolating member having a second rubber elastic body supporting portion that elastically connects the second mass fittings, wherein the first vibration isolating member and the second vibration isolating member are provided. With the first fixing portion side and the second fixing portion side being fitted together by press-fitting into the outer peripheral surface of the shaft-shaped vibrating body, the first fixing portion and the second fixing portion are perpendicular to the axis. Fixing portion mounted on the outer peripheral side of the first fixing portion and the second fixing portion, having an overlapping portion extending in the axial direction when projected from the direction. Dynamic damper characterized in that it is fastened integrally to the vibrator by. 3. The first fixing part and the second fixing part are in close radial contact with each other in a state where the first vibration isolating member and the second vibration isolating member are inserted into the vibrating body by press fitting. The dynamic damper according to claim 2, wherein the dynamic damper is provided. 4. The first fixing portion and the second fixing portion are axially protruding from a part of a circumferential direction of the first rubber elastic body mounting portion and the second rubber elastic body mounting portion, and The first fixing portion and the second fixing portion are circumferentially continuous with each other in a state where the first vibration damping member and the second vibration damping member are inserted into the vibrating body by press fitting. The dynamic damper according to claim 2.