JP2599817Y2 - damper - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a damper which is mounted on a rotary drive system of an automobile engine or the like and absorbs and attenuates vibration generated in a rotary shaft such as a propeller shaft.

[0002]

2. Description of the Related Art Hitherto, as a kind of damper, a hub,
A disk-type dynamic damper in which three parts, an elastic body and a mass body, are arranged in the axial direction (also called Tilger)
However, this type of damper has a problem in that the elastic body made of rubber-like elastic material cannot be used in a compressed state, so that the elastic body deteriorates early.

[0003] In addition, Japanese Utility Model Application No.
Micro of 117373 (Japanese Utility Model No. 4-73644 )
For the damper on the film,
Ring, support plate, bimetal and friction plate
Therefore, the mass on the hub side composed of these five types of parts
It is relatively large. So justify this
The inertial mass on the mass body side must be set large as
Each part becomes larger, and the damper as a whole
Also has the disadvantage of becoming larger.

[0004] In this damper, the bias of the mass body is increased.
The eccentricity prevention part that prevents the center (whirl) is the outer edge of the friction plate
Bend in the axial direction to engage the outer peripheral surface of the mass body.
And provided by. Therefore has bearings
Eccentricity prevention part is provided separately from this bearing
And there is a disadvantage that the configuration is complicated.

[0005]

SUMMARY OF THE INVENTION In view of the above, the present invention can improve the durability of an elastic body and reduce the size of a disk-type dynamic damper .
And an eccentricity prevention part separate from the bearing
It is designed to provide a damper that does not need to be provided .

[0006]

In order to achieve the above object, a damper according to the present invention comprises a hub provided with a flange portion at one axial end of a cylindrical portion and extending radially outward, and a damper at an outer peripheral side of the hub. A mass body in which an annular radial portion is provided radially inward at one axial end of the annular axial portion that is spaced apart, and the radial portion is axially separated from and opposed to the flange portion; An elastic body interposed between the portion and the radial portion,
A bearing interposed between the cylindrical portion and the axial portion , wherein the elastic portion is provided on one axial side of the flange portion.
Body and said radial portion are arranged and said flan
The bearing is located at the other axial end of the
Ri, and that the mass body and the hub is positioned each other <br/> Inijiku direction by the bearing, the elastic body is axially compressed.

[0007]

In the first prior art, the elastic body cannot be used in a compressed state because the hub and the mass connected via the elastic body can elastically deform the elastic body. This is because they are relatively movable in the axial direction within the range, and are not positioned in the axial direction while the elastic body is compressed in the axial direction. On the other hand, according to the present invention, since the bearing is interposed between the cylindrical portion of the hub and the axial portion of the mass body, and the hub and the mass body are axially positioned with respect to each other, It is possible to keep the elastic body compressed in the axial direction.

Further, the mass of the hub side is equal to the mass of the hub and the bearing.
And the sum of all or part of the mass
For this reason, the mass on the hub side should be set relatively small.
It becomes possible.

Further , between the cylindrical portion of the hub and the axial portion of the mass body.
The bearings mounted on the
In addition to this bearing, a separate
It is not necessary to provide an eccentricity prevention part.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.
The mass body 2, the elastic body 3, and the bearing which is an eccentric prevention member
It has four parts of grayed 4.

The hub 1 is formed in an annular shape by sheet metal, and has a flange portion 1b at one axial end (right end in the drawing) of the cylindrical portion 1a facing radially outward (upward in the drawing). Further, an inward flange portion 1c is provided at the other axial end (left end in the drawing) of the cylindrical portion 1a inward in the radial direction (downward in the drawing).

The mass body 2 is formed in an annular shape by cast iron, and is formed in an annular axial portion 2 spaced apart from the outer peripheral side of the hub 1.
an annular radial portion 2 radially inward at one axial end of
b, and the radial portion 2b is connected to the flange portion 1b of the hub 1.
And are spaced apart in the axial direction. An annular stepped portion 2c for positioning when the eccentricity preventing member 4 is fitted to the inner peripheral surface of the axial portion 2a is provided.

[0013] elastic member 3 is formed in an annular by a rubber-like elastic material, the flange and the flange portion 1b of the hub 1
It is interposed between the radial portions 2b of the mass body 2 disposed at one axial end of the portion 1b . The elastic body 3 is vulcanized and bonded to the flange portion 1b and the radial portion 2b at the same time as the molding.

The bearing 4, which is an eccentricity preventing member , is a ball bearing, and includes an inner race 4a fitted on the outer periphery of the cylindrical portion 1a of the hub 1 and an axial portion 2a of the mass body 2.
Outer race 4b fitted on the inner circumference of
a, 4b, a number of balls 4 that are rotatably sandwiched between
c.

In the damper having the above-described structure, when the elastic body 3 is molded by a mold (not shown), the hub 1 and the mass body 2 are inserted into the mold to perform a so-called insert molding. The three parts 1, 2, 3 as shown in FIG. The axial length of the elastic body 3 at this time is L. Next, a bearing 4 is provided between the hub 1 and the mass body 2.
That is, the inner race 4a is fitted on the outer periphery of the cylindrical portion 1a and the outer race 4c is fitted on the inner periphery of the axial portion 2a. At this time, the hub 1 and the mass body 2 are shifted in the axial direction. And the elastic body 3 is compressed in the axial direction (L ′ <L). Therefore, the elastic body 3 can be kept in a compressed state, and the durability of the elastic body 3 can be improved.

[0016] Further, in the damper having the above configuration, the hub 1
Side mass is the mass of hub 1 and the mass of part of bearing 4
(Inner race 4a)
In addition, the mass of the hub 1 is set relatively small.
You. Therefore, the inertia of the mass body 2
Each part can be made smaller because the volume can be set smaller.
Accordingly, the size of the damper can be reduced as a whole.
Therefore, the engine room of an automobile with a limited volume
The space can be used effectively.

[0017] The axial direction of the cylindrical portion 1a of the hub 1 and the mass body 2
The bearing 4 interposed between the facing parts 2a is itself
In order to achieve the function of preventing the eccentricity of the mass body 2
It is not necessary to separately provide an eccentricity prevention part in addition to the ring 4.
Therefore, in this regard, it is possible to perform the same function as before.
Regardless, the configuration of the damper can be simplified.

The bearing 4 may be made of a low friction resin as shown in FIG. 3. In this case, the bearing 4 is provided at the other axial end (left end in the figure) of the axial portion 2a of the mass body 2. The retaining member 5 is fixed.

[0019]

[Effects of the Invention] The present invention has the following effects.

[0020] The present invention of a damper having the above-described arrangement
First, a bearing interposed between the axial portion of the cylindrical portion and the mass of the hub in this bearing hub and the mass body
As a result, the elastic members are positioned in the axial direction to keep the elastic members compressed in the axial direction, so that the durability of the elastic members can be improved.

[0021] In the damper having the above configuration, the hub side
Is the mass of the hub and the quality of some or all of the bearings
And the mass on the hub side
Is set relatively small. So justify this
The inertia mass on the mass body side can be set small as
To reduce the size of each component and make the damper as a whole.
The size can be reduced. Therefore, the volume is limited.
Efficient use of the engine room, etc. of the moving vehicle in that space
can do.

[0022] Also between the cylindrical part of the hub and the axial part of the mass
The bearings mounted on the
In addition to this bearing, a separate
It is not necessary to provide an eccentricity prevention part. Therefore this point
Despite performing the same function as before,
The configuration can be simplified.

[Brief description of the drawings]

FIG. 1 is a half sectional view of a damper according to an embodiment of the present invention.

FIG. 2 is a half sectional view showing a state in which the damper is being assembled.

FIG. 3 is a half sectional view of a damper according to another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Hub 1a Cylindrical part 1b Flange part 1c Inward flange part 2 Mass body 2a Axial part 2b Radial part 2c Step part 3 Elastic body 4 Bearing 4a Inner race 4b Outer race 4c Ball 5 Retaining member

Claims (1)

(57) [Scope of request for utility model registration] 1. An axially outer end of one end of a cylindrical portion (1a) in a radial direction.
A hub (1) provided with a flange portion (1b) toward
An annular axial portion spaced apart on the outer peripheral side of the hub (1)
(2a) One end in the axial direction has a radially inward shape inward in the radial direction.
A radial portion (2b), and the radial portion (2b)
(2) a mass body (2) opposed to the flange portion (1b) in the axial direction.
Between the flange portion (1b) and the radial portion (2b).
An elastic body (3) interposed therebetween, and the cylindrical portion (1a)
Interposed between the axial parts (2a)bearing
(4) andThe elastic body is provided at one axial end of the flange portion (1b).
(3) and the radial portion (2b) is arranged
At the other axial end of the flange portion (1b).
(4) is arranged, The hub (1) and the mass body (2)The bearing
By (4)Axially positioned with respect to each other, said elastic
Characterized in that the body (3) is compressed in the axial direction.
Dampa.