JPH09229137A - Mounting structure of dynamic damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate mounting works, automate the operations, reduce the costs, and improve the durability so that a dynamic damper mounting structure is established for mounting on the rotary shaft of a drive shaft, etc. SOLUTION: A fastening ring 5 consisting of a metal cylinder is attached fast to the periphery of one end of a cylinder part 1 to be mounted on a rotary shaft 10 in a single-piece structure with a rubber part by means of a vulcanizing/molding process, and upon fitting on the rotary shaft 10, the ring 5 is contracted in the diameter by a drawing process so that the rotary shaft 10 is fastened through the rubber part. A fastening cylinder made of a metal furnished with an axial direction slit by allowing a part to remain as a ring form portion, is embedded in the cylinder part by means of vulcanizing/molding process and fitted on the rotary shaft using a pressure fitting means, and thus the rotary shaft is fastened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dynamic damper mounting structure mainly mounted on a rotating shaft such as a drive shaft of an automobile.

[0002]

2. Description of the Related Art A dynamic damper is mounted on a rotary shaft such as a drive shaft of an automobile in order to suppress vibrations due to rotation.

Conventionally, this type of dynamic damper (A
As shown in FIG. 8, 1) is arranged so as to have the same axial center on the radially outer side of the cylindrical portion (51) mounted on the rotary shaft (60) via the radial coupling portion (52). A weight portion (53) holding a weight (54) is provided, and these are integrally vulcanized and molded by a rubber elastic body.

Then, as a means for attaching and fixing the dynamic damper (A1) to the rotary shaft (60), the cylindrical portion (5
The 1) is elastically fitted to the rotating shaft (60) and a special clamp (55) for tightening is attached to the outer circumference of one end of the cylindrical part (51).
Is fitted and the clamp (55) is caulked to compress the material rubber at the end of the cylindrical portion (51), and tighten and fix.

The clamp (55) is shown in FIG.
The ones shown in (a) and (b) are typical ones.
0) has an inner diameter slightly smaller than the outer diameter and has a partially discontinuous ring shape capable of expanding, and is fitted to the outer periphery of the end of the cylindrical portion (51) by utilizing elasticity, A bending type [FIG. 9 (a)] in which the end locking piece (58) is bent and crimped between the protruding stoppers (56) and (56), or a locking projection provided at one end This is a hook type [FIG. 6 (b)] in which the part (59a) is hooked in the locking hole (59b) at the other end and caulked. As a material for these clamps, a stainless material is often used in consideration of rust prevention.

However, since the above-mentioned clamp is made of a stainless steel material, the cost is high, and since the clamp is required to be caulked by a human means, the mounting work requires manpower, which is an obstacle to automation of the mounting work. .

Further, a stepping stone or the like generated when the automobile is running damages the clamp stop portion and weakens the tightening,
The damper may come loose or come off.

In view of the above, the present invention provides a dynamic damper mounting structure that enables automation of mounting work, reduces costs, and withstands flying stones and the like.

[0009]

In order to solve the above problems, the invention of claim 1 provides a dynamic damper comprising a rubber elastic body having a weight portion radially outside a cylindrical portion mounted on a rotary shaft. In the mounting structure, a tightening ring made of a drawable metal cylinder is integrally attached to the outer peripheral portion on one end side of the cylindrical portion, and after the cylindrical portion is fitted to the rotary shaft, It is characterized in that the tightening ring is drawn and the rotary shaft is tightened via the rubber part.

According to a second aspect of the present invention, as a mounting structure of the dynamic damper similar to the above, a tightening cylinder made of a metal cylinder is embedded in the cylindrical portion, and is fitted to the rotary shaft by a press-fitting means. The rotary shaft is tightened via the rubber portion.

In this case, the tightening cylinder has a structure as described in claim 3.
It is preferable that an axial slit is provided so that a part of the ring-shaped portion remains, and that the ring-shaped portion secures a tightening force by press fitting.

[0012]

According to the first aspect of the present invention, when the dynamic damper is attached, the tightening ring integrally attached to the outer peripheral portion on one end side of the cylindrical portion after being fitted at a predetermined position of the rotary shaft. It is only necessary to reduce the diameter by drawing, whereby the tightening ring compresses the rubber inside the cylindrical portion to strongly tighten the rotating shaft, and the dynamic damper is mounted at a predetermined position on the rotating shaft. Moreover, since it does not have a stop like a conventional clamp, there is no risk of damage to the tightening portion due to flying stones, etc. Since it is drawn, it does not loosen or come off.

According to the second aspect of the present invention, if the dynamic damper is fitted to the predetermined position of the rotary shaft by the press-fitting means, the metal clamping tube embedded in the cylindrical section is inserted through the rubber section. A predetermined tightening force is applied so that the dynamic damper is mounted in a predetermined position.
Further, the tightening cylinder is covered and protected by the rubber portion of the cylindrical portion, and the generation of rust and the like is suppressed.

Particularly, when the tightening cylinder is provided with an axial slit while leaving a part thereof as a ring-shaped portion, it is separated by the slit when it is fitted to the rotary shaft. The bent portion slightly expands and can be easily press-fitted, the fitting operation can be easily performed, and a predetermined tightening force is retained by the ring-shaped portion. Also, since the rubber inside and outside the tightening ring is continuously integrated through the slit,
Even if the tightening ring is embedded in the cylinder, it has sufficient strength.

Further, in any of the above-mentioned inventions, the fastening ring or the fastening tube is attached to or embedded in the cylindrical portion by vulcanization molding of the dynamic damper, so that not only the production is facilitated, but also the fastening ring or Since the adhesive strength between the tightening cylinder and the rubber of the cylindrical portion is high, it can be used without fear of loosening.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a first embodiment of a dynamic damper mounting structure according to the present invention.

The dynamic damper (A) has a cylindrical portion (1) having an inner diameter that can be fitted to a rotary shaft (10) such as a drive shaft of an automobile to be mounted, and a radial direction outward from the cylindrical portion (1). And a weight portion (3) arranged on the same axis outside the cylindrical portion (1) by the connecting portion (2). These are integrally vulcanized and molded by a rubber elastic body, and the weight part (3)
A weight (4) made of metal is embedded in the metal.

The cylindrical portion (1) has at least one end portion (1a)
Is extended in the axial direction as a mounting portion, and in particular, on the outer peripheral portion of one end (1a) which is the mounting portion, a tightening ring (5) mainly made of a metal cylinder body such as iron that can be drawn. Is attached integrally. It is preferable that the tightening ring (5) is attached by being vulcanized and adhered to the rubber portion at the same time as the vulcanization molding of the dynamic damper (A) by the rubber elastic body, which facilitates the production. Further, it is preferable that the tightening ring (5) is subjected to a rust preventive treatment if necessary.

In the case of the figure, a convex portion (6) extending in the circumferential direction is provided on the inner peripheral surface of the one end portion (1a) serving as a mounting portion. On the other hand, the rotary shaft (10) is provided with a groove (11) in the circumferential direction corresponding to the convex portion (6) at the mounting position of the dynamic damper (A) to rotate the cylindrical portion (1). Axis (10)
The convex portion (6) is fitted and positioned when it is fitted into. The convex portion (6) and the groove (11) do not have to be continuous in the circumferential direction, and can be formed intermittently in the circumferential direction, and in this case, positioning in the circumferential direction is also possible. , Exerts a detent effect.

When the dynamic damper (A) is attached, the cylindrical portion (1) is elastically fitted to the rotary shaft (10), and the convex portion (6) provided on the inner circumference of the cylindrical portion (1) is attached. ) Is fitted in a groove (11) provided at a predetermined position of the rotary shaft (10) and positioned in the axial direction. Thus, one end (1
The tightening ring (5) in (a) may be drawn to reduce its diameter, whereby the inner rubber portion is compressed, and the rotary shaft (10) is fixed to the tightening ring (5) through the rubber portion. ) Tighten. Due to this tightening force, the dynamic damper (A) is attached and fixed at a predetermined position with respect to the rotary shaft (10).

In the drawing process, in addition to the uniform drawing in which the diameter is uniformly reduced over the entire width of the tightening ring (5), a part in the width direction as shown in FIG. As described above, partial diaphragms may be provided at one or a plurality of positions in the circumferential direction, and can be appropriately set according to the structure and strength of the rotating shaft. For example, when drawn as shown in FIG. 2, the effect of preventing the tightening ring (5) from coming off from the cylindrical portion (1) becomes large. Further, in the case of the drawing processing as shown in FIG. 3, if the rotary shaft is also provided with the recessed portion at the corresponding portion, the slip-out effect in the axial direction and the slip prevention effect in the rotational direction become large.
(5a) shows a partial narrowed portion.

As the tightening ring (5), a relatively inexpensive material such as iron can be used as compared with stainless steel. The tightening ring (5) preferably has a wall thickness of about 2.5 to 3.0 mm in consideration of functional deterioration due to rust or the like and external damage due to flying stones, and the width (axial length). Also, regarding the above, it may be determined in consideration of the effect of tightening the diaphragm. Further, if necessary, attach the tightening ring (5) to the cylindrical part (1).
It can also be implemented by arranging at both ends.

FIG. 4 shows another embodiment of the mounting structure of the dynamic damper.

The structure of the dynamic damper (A) of this embodiment is basically the same as that of the above-mentioned embodiment, but the tightening ring (5) which gives the tightening force by the above-mentioned drawing process is used. Instead, the tightening cylinder (7) made of a metal cylinder such as iron is embedded in at least a part of the cylindrical portion (1) to secure a predetermined tightening force by press fitting into the rotary shaft (10). I have to.

That is, when vulcanizing and molding the cylindrical portion (1), the connecting portion (2) and the weight portion (3) with a rubber elastic body,
Together with the weight (4) of the weight portion (3), the tightening cylinder (7) is molded and integrated so as to be embedded in at least a part of the cylindrical portion (1), for example, the rubber portion on the one end (1a) side. I will let you. At this time, considering the tightening force by press fitting,
The inner diameter of the rubber portion inside the tightening cylinder (7) is set to be slightly smaller than the diameter of the rotating shaft (10).

The tightening cylinder (7) is provided with a portion of its circumference, for example, as shown in FIGS. 5 and 6, surrounding the axial slit (8) so that one end remains as a ring-shaped part (7a). It is preferable to provide a plurality at equal angular positions in the direction, and the side having this slit (8) is set as the leading side at the time of press-fitting and is embedded in the one end (1a) side of the cylindrical portion (1). Is good. The width, length and shape of the slit (8) may be set so that a sufficient tightening force can be obtained depending on the characteristics of the metal material used.

By forming the slit (8) in this way, the rubber portion inside and outside the embedded tightening cylinder (7) is continuously integrated through the slit (8), whereby the tightening cylinder (7) is formed. Despite the fact that 7) is buried, it retains sufficient strength.

When mounting the dynamic damper (A), the cylindrical portion (1) is fitted to the rotary shaft (10) in the same manner as described above, and the dynamic damper (A) is fitted to a predetermined position. To do. At this time, tightening cylinder (7)
The part (7b) separated by the axial slit (8) slightly expands and can be easily press-fitted, so that the fitting operation can be easily performed. Then, after being fitted in this manner, the tightening cylinder (7) is drawn to reduce its diameter, so that the rotating shaft (1
It can be attached and fixed by tightening 0).

The length and the embedding position of the tightening cylinder (7) can be arbitrarily set according to the required tightening force, and as shown in FIG. 4, in addition to embedding in a part of the cylindrical portion (1). As shown in FIG. 7, it can be buried over the entire length of the cylindrical portion (1). In this way, when it is embedded over the entire length, it is possible to prevent floating during rotation and obtain stable characteristics.

[0031]

As described above, according to the mounting structure of the dynamic danher of the present invention, in the case of the invention of claim 1,
By tightening the tightening ring in a state of being fitted to the rotary shaft, it can be securely attached and fixed at a predetermined position of the rotary shaft, and in the case of the inventions of claims 2 and 3, it is fitted by the press-fitting means to the rotary shaft. By simply doing this, it can be attached and fixed to the rotary shaft by the tightening force of the tightening tube embedded in the cylindrical portion. Therefore, as compared with the conventional one using a clamp that requires a caulking means, the mounting work is easier, and particularly the automation is also possible.

Moreover, the above-mentioned tightening ring or tightening cylinder can be integrally attached or embedded by vulcanization molding of the dynamic damper, and is easy to manufacture as compared with the case of using a clamp. Since a relatively inexpensive metal material such as iron can be used as the material, the cost can be reduced in combination with the fact that the mounting work can be simplified and automated.

Particularly, in the case of the inventions of claims 2 and 3, since the tightening ring itself is buried and protected in the rubber portion, the rustproof effect and the damage preventive effect are excellent, and the fitting work of the dynamic damper is facilitated. .

Further, since it does not have a stopper by caulking, it is strong and durable against flying stones in use and has high reliability.

[Brief description of drawings]

FIG. 1 is a mounting structure 1 of a dynamic damper of the present invention.
It is sectional drawing of an Example.

FIG. 2 is a partial enlarged cross-sectional view showing an example of a diaphragm state.

FIG. 3 is a cross-sectional view showing another example of a diaphragm state.

FIG. 4 is a cross-sectional view of another embodiment of the dynamic damper mounting structure of the present invention.

FIG. 5 is a perspective view showing an example of a tightening cylinder used in the above-mentioned mounting structure.

6 (a) and 6 (b) are side views showing another example of the tightening cylinder.

FIG. 7 is a cross-sectional view showing another example of the embedded state of the tightening cylinder.

FIG. 8 is a half sectional view of a conventional dynamic damper mounting structure using a clamp.

9 (a) and 9 (b) are perspective views each illustrating a clamp used for mounting the same as above.

[Explanation of symbols]

 (A) Dynamic damper (1) Cylindrical part (1a) One end part (2) Connecting part (3) Weight part (4) Weight (5) Tightening ring (7) Tightening tube (7a) Ring-shaped part (8) Axial slit (10) Rotation axis

Claims (3)

[Claims] 1. A dynamic damper mounting structure comprising a rubber elastic body having a weight portion radially outside of a cylindrical portion mounted on a rotary shaft, wherein at least one outer peripheral portion of the cylindrical portion can be drawn. A fastening ring made of a metal tubular body is integrally attached, and after being fitted on the rotary shaft, the fastening ring is drawn and the rotary shaft is fastened via the rubber part. Characteristic dynamic damper mounting structure. 2. A dynamic damper mounting structure comprising a rubber elastic body having a weight portion radially outside a cylindrical portion mounted on a rotary shaft, wherein a tightening cylinder made of a metal cylindrical body is attached to the cylindrical portion. A mounting structure for a dynamic damper, which is embedded and is fitted into a rotary shaft by a press-fitting means, and the rotary shaft is tightened via a rubber portion. 3. The tightening cylinder is provided with an axial slit so that a part of the tightening cylinder remains as a ring-shaped portion, and the tightening force by press-fitting is secured by the ring-shaped portion. The mounting structure for the dynamic damper according to claim 2.