JPH0724684Y2 - damper - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an improvement of a damper that absorbs and attenuates vibrations generated in various rotary drive systems such as a crankshaft of an automobile engine.

[Prior Art] Conventionally, as a kind of damper, as shown in FIG.
It has an annular hub (11) that is attached to the crankshaft of an automobile engine, and the rim portion (11) of this hub (11).
Damper parts (12) and (13) on the inner and outer circumferences of a) respectively.
A double-mass type torsional damper provided with is known. The damper parts (12) (13) vulcanize the rubber elastic bodies (18) (19) between the annular sleeves (14) (15) and the annular mass bodies (16) (17), respectively. They are assembled as bonded molded products, and these two sets of molded products are fitted to the inner peripheral side and the outer peripheral side of the rim portion (11a), respectively.

[Problems to be solved by the device]

However, in the above-described conventional damper, the two sets of damper parts (12) and (13) are molded separately from each other and separately fitted to the rim part (11a). Therefore, according to the above-mentioned conventional technique, two vulcanization molds for molding the damper parts (12) and (13) are required, and in addition, since the number of constituent parts of the damper is large, a large amount is required for molding and subsequent assembly. There is a problem that it takes time and labor, and improvement in cost is desired.

[Means for Solving the Problems]

In view of the above points, the present invention is intended to solve the problems found in the above-mentioned conventional techniques, and in order to achieve this object, a hub having a rim portion and a substantially U-shaped cross section are provided,
A sleeve fitted to the rim portion, two elastic bodies bonded to the sleeve, and two elastic bodies bonded to the elastic bodies.
Two mass bodies, and on the radial surface portion of the sleeve,
A damper having a bellows portion that expands and contracts in a radial direction.

[Action]

The sleeve fitted to the rim portion of the hub has a substantially U-shaped cross section, and two sets of damper portions are set in this one sleeve.
As a result, two sets of damper parts can be collectively molded as one molded product, and it is possible to reduce the number of parts while using one vulcanization mold. Further, since the bellows portion that expands and contracts in the radial direction is provided on the radial surface portion of the sleeve, the fitting work can be facilitated and the caliber of the elastic body can be made uniform.

〔Example〕

 Next, an embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral (1) indicates an annular hub attached to a crankshaft of an automobile engine, and a sleeve (2) having a substantially U-shaped cross section is fitted to a rim portion (1a) of the hub (1). The ring-shaped mass bodies (5) and (6) and the rubber elastic body (on the inner peripheral side of the inner cylindrical portion (2a) and the outer peripheral side of the outer cylindrical portion (2b) of the sleeve (2), respectively. 7)
The damper parts (3) and (4) consisting of (8) are set. In this structure, it can be said that two sets of damper parts (3) and (4) share one sleeve (2).

A sleeve (2) having a substantially U-shaped cross section, two mass bodies (5)
The (6) and the two elastic bodies (7) and (8) are collectively formed into one molded product. That is, the vulcanization type cavity has a sleeve (2) and two mass bodies (5).
By incorporating (6), two elastic bodies (7) and (8) are simultaneously vulcanized and molded, and simultaneously with this vulcanization, each elastic body (7) is vulcanized and molded.
The (8) is adhered to the sleeve (2) and the mass bodies (5) and (6). By doing so, the number of vulcanization molds can be reduced to one and the number of parts can be reduced, so that the labor and time required for molding and assembling can be reduced.

The sleeve (2) having a substantially U-shaped cross section is formed by pressing a metal plate, and when the sleeve (2) is fitted to the rim portion (1a), the sleeve (2) is attached to the elastic body (7) (8). It is required to provide a uniform pre-compression in the axial direction. The inventors of the present application first devised the following countermeasures for this caliber.

That is, as shown in FIG. 1, the inner cylinder part (2a) and the outer cylinder part (2b) of the sleeve (2) are different from the plate thickness of the rim part (1a).
Set a small gap between the sleeve (2) and the rim (1a)
The inner cylinder part (2a) and the outer cylinder part (2b) are expanded when they are fitted into the elastic body (7).
(8) is compressed in the radial direction. In this case, the inner cylinder portion (2a) and the outer cylinder portion (2b) that are reduced in diameter or expanded in diameter are not linear in the entire axial direction but partially bent.
Inner cylinder part (2a) and outer cylinder part (2b) of the sleeve (2)
A play portion (2a ') (2b') which is not fitted to the rim portion (1a) is provided at one end (end near the radial surface portion (2c)) of the play portion (2a ') (2b'). By utilizing the fact that it becomes tapered when fitted, the inner cylinder (2a) and the outer cylinder (2
Ensure that the part fitted in the rim (1a) in b) is straight. Therefore, the inner and outer elastic bodies (7) and (8) can thereby be uniformly compressed in the radial direction over the entire axial length. In this case, the sleeve (2)
By setting the play parts (2a ') (2b'),
The shape extends to the left side of the figure.

On the other hand, as shown in FIG. 2, the bellows portion (2d) that expands and contracts in the radial direction on the radial surface portion (2c) of the sleeve (2).
(2e) is provided, and when the bellows portions (2d) and (2e) are extended in the radial direction at the time of fitting, the play portions (2a ′) (2
It is not necessary to provide b ′), and the calibres of the elastic bodies (7) and (8) can be well homogenized.

[Effect of device]

As described above, according to the damper of the present invention, the sleeve fitted to the rim portion of the hub has a substantially U-shaped cross section, and two sets of damper portions are set in this one sleeve. Since the number can be reduced to one and the number of parts can be reduced, the labor and time required for molding and assembling can be reduced. In addition to this, since the bellows portion that expands and contracts in the radial direction is provided on the radial surface portion of the sleeve, the caliber of the elastic body can be made uniform.

[Brief description of drawings]

FIG. 1 is a half sectional view of a damper according to an embodiment of the present invention, FIG. 2 is a sectional view of essential parts showing a state before and after fitting a sleeve according to another embodiment of the present invention, and FIG. 3 is a conventional example. FIG. 6 is a half-cut sectional view of the damper according to the first embodiment. (1) Hub, (1a) Rim part, (2) Sleeve, (2a) Inner cylinder part, (2b) Outer cylinder part (2c) Radial surface part, (2d) (2e) Bellows part, (2a ')
(2b ') Play part (3) (4) Damper part, (5) (6) Mass body, (7)
(8) Elastic body

Claims (1)

[Scope of utility model registration request] 1. A hub (1) having a rim portion (1a), a sleeve (2) having a substantially U-shaped cross section and fitted in the rim portion (1a), and bonded to the sleeve (2). The two elastic bodies (7) and (8) and the two mass bodies (5) and (6) bonded to the elastic bodies (7) and (8), respectively, and the sleeve (2) in the radial direction. A damper characterized in that a bellows portion (2d) (2e) that expands and contracts in a radial direction is provided on the surface portion (2c).