JP2808008B2 - Manufacturing method of damper - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper that absorbs vibrations generated in various rotary drive systems such as a propeller shaft of an automobile engine.

[Conventional technology]

Conventionally, as a kind of damper, as shown in FIG. 5, a hub 1 and a mass body 2 which are concentric with each other are provided, and the hub 1 and the mass body 2 are interconnected via a plurality of spring members 3. Dynamic dampers are known. The hub 1 and the mass body 2 are each formed of a predetermined metal, and the spring member 3 is formed of a predetermined rubber, and the rubber is bonded to the hub 1 and the mass body 2 by vulcanization. As shown in the figure, the hub 1 is formed in a square front shape, and the rubber is adhered to the center of each side.

[Problems to be solved by the invention]

The damper constitutes a kind of resonance system with respect to the propeller shaft and absorbs and attenuates vibration (torsional vibration) generated in the shaft. However, in a certain rotational speed range due to radial resonance and the action of centrifugal force. There is a problem that the mass body 2 is largely eccentric with respect to the hub 1, that is, the center of rotation, and new vibration and noise are generated.

[Means for solving the problem]

In view of the above, it is an object of the present invention to suppress the eccentricity of a mass body and to prevent the occurrence of vibration and noise due to the eccentricity.In order to achieve this object, a mass body is provided on the outer peripheral side of a hub. The rubber member is vulcanized and bonded to the two members, and a rubber stopper positioned on the inner peripheral side of the mass body is vulcanized and bonded to the outer peripheral surface of the hub. Setting a gap between the mass body and the stopper by setting an adhesive non-applied portion on a portion of the inner peripheral surface that comes into contact with the stopper and generating sink marks after vulcanization in the stopper. An object of the present invention is to provide a method of manufacturing a damper.

(Operation)

When the hub and the mass body are assembled into a mold and the spring member and the stopper are vulcanized, the two members are molded to a size that comes into contact with the inner peripheral surface of the mass body. Prior to this, an adhesive is applied to the inner peripheral surface of the mass body, but at this time, the adhesive is not applied to a portion that comes into contact with the stopper. When the spring member and the stopper are simultaneously vulcanized in this state, a very small gap is set between the inner peripheral surface of the mass body and the outer end surface of the stopper due to sink (shrinkage) of the stopper. When the mass body is eccentric due to the operation of the damper, the mass body quickly contacts the stopper, so that the eccentricity of the mass body is slightly suppressed.

〔Example〕

Next, the present invention will be described in detail with reference to the drawings.
1 and 2 show a half cut front and a cross section of a damper manufactured by the manufacturing method according to the embodiment.

As shown in both figures, a mass body 2 is arranged concentrically on the outer peripheral side of the hub 1 and a spring member 3 made of a rubber material is vulcanized and bonded to the members 1 and 2. The hub 1 is formed in a square front shape, and a spring member 3 is bonded to the center of each side.
The spring members 3 are evenly distributed. Stoppers 4 made of the same rubber material as the spring member 3 are vulcanized and bonded to each of the four corners of the hub 1, and a very small gap 5 is set between the outer end surface of each stopper 3 and the inner peripheral surface of the mass body 2. Have been.

 The damper is manufactured by the following procedure.

That is, first, the hub 1 and the mass body 2 are each formed into a predetermined product shape, and both members 1 and 2 are incorporated into a rubber material forming die (not shown). A space for incorporating the two members 1 and 2 and a cavity for molding the spring member 3 and the stopper 4 (both are equally distributed) are set in the molding die in advance. Includes a portion that becomes the gap 5. That is, the stopper 4 is connected to the mass 2
Is formed into a size that comes into contact with the inner peripheral surface of the above. An adhesive is applied to the hub 1 and the mass body 2 before the assembly, but the adhesive is not applied to a portion of the inner peripheral surface of the mass body 2 which comes into contact with the stopper 4. In this state, the mold is clamped, the cavity is filled with a molding material, and the spring member 3 and the stopper 4 are vulcanized. As the cooling after molding proceeds, the rubber molded part tends to shrink as a result, but the stopper 4 and the mass body 2 to which no adhesive is applied are applied.
And a very small gap 5 is set by causing sink marks only in the contact portions of the contact.

The above-mentioned damper is manufactured in this way, and even if the mass body 2 becomes eccentric due to its operation, the eccentricity can be suppressed very slightly. In order to completely prevent eccentricity, it is conceivable to interpose a bearing (not shown) between the hub 1 and the mass body 2 instead of the stopper 4, but in this case, a new sliding resistance is provided by the bearing. There is a concern that this may adversely affect the damper characteristics. In the above damper, the stopper 4 and the mass body 2 are separated from each other with a minimum dimension, and the operation when there is no eccentricity is also considered.

In the examples shown in FIGS. 1 and 2, the front shape of the hub 1 is square in conformity with the conventional example, but may be an annular shape as shown in FIG. In the dampers of FIGS. 3 and 4, a metal block 6 having a predetermined mass is embedded at a position near the outer periphery of each stopper 4. When the damper is operated, the block 6 functions to enhance the structure of the stopper 4 by the action of the centrifugal force accompanying the rotation, and
Eccentricity can be suppressed more effectively.

〔The invention's effect〕

As described above, according to the present invention, the eccentricity of the mass body can be promptly suppressed, and the operation of the damper can be stabilized with a small center runout. In addition, an adhesive-unapplied part is set on the inner peripheral surface of the mass body that comes into contact with the stopper, and an extremely small gap is set between the mass body and the stopper by generating sink marks after vulcanization of the stopper. Therefore, it is possible to obtain a substantially sufficient eccentricity preventing effect and prevent the damper characteristics from being adversely affected.

[Brief description of the drawings]

FIG. 1 is a half cut front view of a damper according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line AOA of FIG. 1, and FIG. 3 is a half cut front view of a damper according to another example of the present invention. FIG. 4 is a sectional view taken along the line B--O--B in FIG. 3, and FIG. 5 is a half cut front view of a conventional damper. 1 hub 2 mass body 3 spring member 4 stopper 5 gap 6 block

Claims (1)

(57) [Claims] 1. A mass body (2) is spaced apart from an outer peripheral side of a hub (1), and a rubber spring member (3) is vulcanized and bonded to the two members (1) and (2). A rubber stopper (4) positioned on the inner peripheral side of the mass body (2) is vulcanized and bonded to the outer peripheral surface of (1), and the stopper (4) is formed on the inner peripheral surface of the mass body (2). ) Is set at a portion where no adhesive is applied, and a sink (4) is formed in the stopper (4) after vulcanization, so that a gap (5) is formed between the mass body (2) and the stopper (4). A method for manufacturing a damper, comprising: