JPH0610991A - Damper and its manufacture - Google Patents

Abstract

PURPOSE:To prevent a rubber thin film from being molded to deteriorate the radiation property on the inner peripheries or the outer periphery of the mass bodies of a damper connected with the mass bodies to a hub via an elastic body and stuck with the elastic body to one end face in the axial direction of the mass bodies. CONSTITUTION:Circular step sections 9-11 are provided on the inner peripheries 4b, 5b or the outer periphery 4c of mass bodies 4, 5. Surfaces of the step sections 9-11 and the inner peripheries 4b, 5b or the portions 4b', 5b', 4c' of the outer periphery 4c beyond the step sections 9-11 are exposed respectively, and the area of the surface exposed portions is made wider than before. When weir sections 12-14 are coupled with the step sections 9-11 in manufacturing this damper, a molding material is surely prevented from infiltrating.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper and its manufacturing method. The damper of the present invention is mounted on a rotary drive system of an automobile engine or the like, and is used as a torsional damper that absorbs and damps vibrations generated on a rotary shaft such as a crankshaft.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 2, mass bodies 4 and 5 are connected to a hub 1 via elastic bodies 2 and 3, and the elastic bodies 2 and 3 are connected to an axial end surface 1a of the hub 1. There are known dampers that are respectively bonded to the axial end surfaces 4a and 5a of the mass bodies 4 and 5. The members are annular and are coaxially combined with each other. The hub 1 and the mass bodies 4 and 5 are made of a predetermined metal, and the elastic bodies 2 and 3 are made of a predetermined rubber-like elastic material. ing. In this damper, the hub 1 and the mass bodies 4 and 5 are placed in a cavity of a mold (not shown), and elastic bodies 2 and 3 are placed in the cavity.
It is manufactured by filling a molding material for molding (1) and adhering the molding material to the axial one end surface 1a of the hub 1 and the axial one end surfaces 4a and 5a of the mass bodies 4 and 5 simultaneously with the molding. The damper is a disk type and a double mass type as shown.

This kind of damper constitutes a kind of resonance system with respect to the rotary drive system, and the mass bodies 4 and 5 are swung around a rotary shaft (not shown) and the hub 1 fixed to this rotary shaft to generate vibration. Absorb and decay. Therefore, elastic bodies 2, 3
In response to this operation of the mass bodies 4 and 5, the elastic body constantly repeats elastic deformation, whereby heat is generated in the elastic bodies 2 and 3. This heat is transferred from the elastic bodies 2 and 3 to the hub 1 and the mass bodies 4 and 5 because the hub 1 and the mass bodies 4 and 5 are made of metal and their thermal conductivity is relatively large. It is released from these surfaces into the atmosphere.

[0004]

However, when the damper is manufactured by the manufacturing method described above, a part of the molding material for molding the elastic bodies 2, 3 is located between the mass bodies 4, 5 and the inner wall of the cavity. In order to penetrate, the thin films 6, 7, 8 made of rubber-like elastic material are formed on the inner peripheral surfaces 4b, 5b or the outer peripheral surface 4c of the mass bodies 4, 5 while being bonded to these surfaces 4b, 5b, 4c. It may be done. When such thin films 6, 7 and 8 are formed, the inner peripheral surface 4 of the mass bodies 4 and 5 is
Since the b, 5b or the outer peripheral surface 4c is covered with the thin films 6, 7, 8, the heat radiation effect is impaired, and the elastic bodies 2, 3
However, there is a problem of early deterioration.

[0005]

SUMMARY OF THE INVENTION In view of the above points, the present invention has been devised to solve the above-mentioned problems in the prior art. To achieve this object, an elastic body is attached to the hub. In the damper formed by connecting the mass body via the elastic body and adhering the elastic body to one axial end surface of the mass body, an annular step portion is provided on the inner peripheral surface or the outer peripheral surface of the mass body, and the step portion Provided is a damper characterized by exposing the inner peripheral surface or the outer peripheral surface of the portion beyond the step portion, respectively. At the same time, a mass body is placed in a cavity of a mold, a molding material for molding an elastic body is filled in the cavity, and the molding material is bonded at the same time as the molding material to an axial end surface of the mass body. In the manufacturing method, an annular step portion is provided on the inner peripheral surface or the outer peripheral surface of the mass body, and an annular weir portion that prevents the molding material from wrapping around is engaged with the step portion, and the elastic body is held in this state. There is provided a damper manufacturing method characterized by molding (claim 2).

[0006]

[Function] By providing an annular step portion on the inner or outer peripheral surface of the mass body and exposing the step portion and the portion beyond the step portion respectively on the surface, a sufficient heat radiating action is provided by these portions. Play. Further, such a damper is provided with an annular step portion on the inner peripheral surface or the outer peripheral surface of the mass body, the mass body is placed in a cavity of a mold, and the cavity is filled with a molding material for molding an elastic body. It is easily manufactured by engaging an annular weir portion that prevents the molding material from wrapping around the portion and molding the elastic body in this state.

[0007]

Embodiments of the present invention will now be described with reference to the drawings.

As shown in FIG. 1, a metallic mass body 4 is attached to a metallic hub 1 via elastic bodies 2 and 3 made of a rubber-like elastic material.
5 is connected, and the elastic bodies 2 and 3 are one axial end surface 1 of the hub 1.
a and the axially one end surfaces 4a and 5a of the mass bodies 4 and 5 are respectively bonded. Annular step portions 9, 10, 11 are formed on the inner peripheral surface 4b and the outer peripheral surface 4c of the inner peripheral side mass body 4 and on the inner peripheral surface 5b of the outer peripheral side mass body 5, respectively. 11 and a portion of the inner peripheral surface 4b, 5b or the outer peripheral surface 4c beyond the stepped portion 9, 10, 11 (a portion on the tip end side in the axial direction) 4b ', 5b', 4c ', respectively, over the entire circumference. The surface is exposed. Each member is annular and is coaxially combined with each other.

The damper having the above structure is manufactured by the following method. That is, first, the inner peripheral surface 4 of the mass body 4 on the inner peripheral side
b, the outer peripheral surface 4c, and the inner peripheral surface 5b of the mass body 5 on the outer peripheral side, annular step portions 9, 10, 11 are formed, respectively, and the mass bodies 4, 5 are fixed together with the hub 1 in a cavity of a mold (not shown). To do. Next, the cavity is filled with a molding material for molding the elastic bodies 2, 3, and weirs 12, 13, 1 for preventing the molding material from flowing into the step portions 9, 10, 11 respectively.
Engage 4 The dam portions 12, 13, 14 are protrusions provided on the mold side, or are separate members that are fixed together with the mass bodies 4, 5 and the hub 1 in the cavity. Next, the elastic bodies 2 and 3 are molded in this state, and at the same time as the molding, the axial end surfaces 1a of the hub 1 and the axial end surfaces 4a and 5 of the mass bodies 4 and 5 are formed.
Adhere to a.

The damper having the above-mentioned structure includes the step portions 9, 10, 11 and the portions 4b ', 5b', which are located in front of the step portions 9, 10, 11.
4c 'are surface-exposed over the entire circumference, and the area of the surface-exposed portion is ensured to be wider than in the conventional case, whereby a sufficient heat dissipation effect is achieved. Therefore, it is possible to prevent the elastic bodies 2 and 3 from being prematurely deteriorated by heat being collected in the elastic bodies 2 and 3. It should be noted that this damper is a double mass type as in the conventional example, and the step portions 10 and 11 are provided on the outer peripheral surface 4c of the inner peripheral mass body 4 and the inner peripheral surface 5b of the outer peripheral mass body 5, respectively. Since the opening area A between the mass bodies 4 and 5 is made larger than in the conventional case, the heat dissipation can be improved also from this point. Further, according to the manufacturing method of the above procedure, it is possible to reliably prevent the molding material from flowing around by engaging the dam portions 2, 13, 14 with the step portions 9, 10, 11, so that the above-described operational effects It is possible to easily manufacture a damper that produces

[0011]

The present invention has the following effects. That is,
In the damper according to claim 1, an annular step portion is provided on the inner peripheral surface or the outer peripheral surface of the mass body, and the step portion and a portion of the inner peripheral surface or the outer peripheral surface that is ahead of the step portion are exposed, respectively. Since the area of the surface exposed portion is secured to be wider than the conventional one and a sufficient heat dissipation effect is achieved, it is possible to prevent the elastic body from being heat-collected and prematurely degrading the elastic body.
Further, in the damper manufacturing method according to the second aspect, since the molding material is surely prevented from flowing around by engaging the dam portion with the step portion, it is possible to easily manufacture the damper having the above-described operational effects.

[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 half-cut sectional view of a damper according to a conventional example.

[Explanation of symbols]

 1 hub 1a, 4a, 5a axial direction one end surface 2,3 elastic body 4,5 mass body 4b, 5b inner peripheral surface 4c outer peripheral surface 4b ', 4c', 5b 'tip portion 6,7,8 thin film 9,10 , 11 steps 12, 13, 14 weir

Claims (2)

[Claims] 1. A mass body (4) (5) is connected to a hub (1) via elastic bodies (2) and (3), and the elastic body (2) is connected.
(3) is the one end face (4) of the mass body (4) (5) in the axial direction.
a) A damper formed by adhering to (5a), an annular step (9) (10) (on an inner peripheral surface (4b) (5b) or an outer peripheral surface (4c) of the mass body (4) (5). 11) is provided,
The steps (9) (10) (11) and the inner peripheral surface (4b)
(5b) or the step (9) (1) on the outer peripheral surface (4c)
0) (11) and the previous part (4b ') (5b') (4
C ') and the surface exposed respectively, the damper. 2. A mass body (4) (5) in a cavity of a mold.
Is placed, and the cavity is filled with a molding material for molding the elastic bodies (2) and (3), and at the same time when the molding material is molded, one end surface (4a) (4a) in the axial direction of the mass bodies (4) and (5) ( 5
In the method of manufacturing a damper to be adhered to a), an annular step (9) (10) (11) is formed on the inner peripheral surface (4b) (5b) or outer peripheral surface (4c) of the mass body (4) (5). Is provided
The stepped portions (9), (10) and (11) are engaged with annular dam portions (12), (13) and (14) for preventing the molding material from wrapping around, and in this state, the elastic bodies (2) (3). ) Is molded, the manufacturing method of the damper characterized by the above-mentioned.