JP2000009181A - Torsional damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To change a method of rolling forging and cutting so as to reduce manufacturing cost by composing mass of a combination of two or more pressed material or a combination of cast material and pressed material. SOLUTION: First mass 1 is formed in a pair of almost ring shape fitted to both lateral sides of a plate 3 through vulcanization-bonded rubber material 4. Second mass 2 is welded almost in ring shape to the outer peripheral edge part side of the first mass 1 and composed of inner mass 21 and outer mass 22 integrally fixed by a press. After inserting one end of the outer mass 22 in a groove formed in U-shape cross section at the inner mass 21, the outer mass 22 is formed being folded outside 90 deg. by 90 deg. by the press machine. The second mass 2 formed by welding the inner peripheral edge parts A of the mass 21, 22 are arranged in lateral symmetry and integrated being welded at the edge part B of abutting parts 23. A suitable viscous fluid L is filled in space surrounded by the mass 1, 2 and rubber material 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torsional damper for reducing torsional vibration of a rotating shaft of an internal combustion engine.

[0002]

2. Description of the Related Art In a conventional torsion damper,
For example, as shown in FIG. 8 (half sectional view, that is, a sectional view divided at the center line in the entire sectional view),
00, a mass (a first mass 103 and a second mass 103) forming an inertia ring via a rubber 102 is attached to the plate 101.
Is known in which a viscous fluid 105 is sealed in a gap formed between the three members.

In this torsional damper,
The mass to be used has the following required properties: a method of rolling forging and cutting by obtaining the largest possible inertial mass in a given space and being able to be welded to create an airtight chamber for enclosing a viscous fluid. Or, it is manufactured by a method of cutting out from a plate material.

[0004]

However, in such a manufacturing method, the cost is high in manufacturing any of the second masses 104 by any method, which is a problem. Therefore, an object of the present invention is to provide a torsional damper capable of reducing the manufacturing cost in view of the above-mentioned drawbacks.

[0005]

That is, according to the present invention, an inertia ring constituting a mass is attached to a plate fixed to a rotating shaft via an elastic body such as rubber, and a space formed between these three members is provided. A torsional damper enclosing a viscous fluid, wherein the mass comprises a combination of two or more press materials or a combination of a casting material and a press material.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a half sectional view showing a torsion damper according to the present invention. In this torsion damper, a second mass 2 is welded to an outer peripheral edge of a first mass 1. In addition, the reference numeral 31 in FIG.

The first mass 1 is composed of a substantially ring-shaped member attached to the plate 3 via a rubber material (elastic body) 4 which has been vulcanized and adhered. ing. In addition, the plate 3 is a rotating shaft not shown,
For example, it is fixed to a crankshaft or the like.

The second mass 2 is formed on a substantially ring welded to the outer periphery of the first mass 1. In this embodiment, the inner mass 21 and the outer mass 21 are integrally fixed by a press. 22. The inner mass 21 is formed to have a substantially U-shaped cross section. After inserting one end of the outer mass 22 into the groove of the inner mass 21, the inner mass 21 is pressed by a press machine.
The outer mass 22 is formed by being folded outward four times at 0 degree. After being integrally formed in this way, the inner peripheral edges A of these masses 21 and 22 are welded and firmly fixed. The second masses 2 formed in this manner are formed in a pair symmetrically in the left-right direction, and are welded together at an edge B of the abutting portion 23 (hereinafter, abutting edge) to be integrated. The butting portion 23 is radially outward with respect to the first mass 1 and
It is arranged on the inner side in the rotation axis direction. The first cell 1,
An appropriate (viscous) fluid L is sealed in a space surrounded by the second mass 2 and the rubber material 4.

Prior to welding at the abutting edge B,
After the pair of second masses 2 are arranged so as to sandwich the disc-shaped plate 3 from both sides, the first mass 1 and the contact edge C
(Welding at the abutting edge B may be performed at the same time). Also, instead of welding at the welding edge portion B, the welding may be performed at that portion. Further, in this embodiment, the inner mass and the outer mass are formed of a pressed material. However, for example, the inner mass may be formed of a casting (in this case, the outer mass is formed of a pressed material. Do).

Next, another embodiment of the present invention will be described. In this embodiment, the same parts as those in the previous embodiment are denoted by the same reference numerals, and the description thereof will not be repeated. FIG. 2 shows a torsion damper according to a second embodiment,
In this torsion damper, both ends of the outer mass 52 are pressed and bent by 90 degrees by a press machine so as to be integrated with the inner mass 51 having an I-shaped cross section that forms the second mass 5.

The outer mass 52 and the inner mass 51 are made of a pressed material. However, the inner mass 51 may be made of a laminate of two ring-shaped plates. The inner mass may be made of a casting. In this embodiment, the inner mass is welded to the outer mass at the inner peripheral edge A. In addition, for example, as shown in FIG.
The outer mass 52 may be press-fitted and fitted and integrated, or as shown in FIG. 4, the outer mass 52 may be integrated with the inner mass 51 by caulking.

In addition to the above-described embodiment, for example, as shown in FIG. 5, the second mass 6 includes an inner mass 61 and an outer mass 62, and as shown in FIG. 61 may be pressed and bent by a press machine to be integrated. Further, as shown in FIG. 7, the second mass 7 is composed of an inner mass 71 and an outer mass 72 each made of a pressed material,
A configuration in which the inner peripheral edge portion A is welded and integrated may be used.

[0013]

As described above, according to the present invention, an inertia ring constituting a mass is attached to a plate fixed to a rotating shaft via an elastic body such as rubber, and is formed between these three members. Is a torsional damper in which a viscous fluid is sealed in the gap. Since it is not manufactured by a method that increases the manufacturing cost such as shaving from a lump, it is possible to significantly reduce the manufacturing cost and to manufacture a product with a large inertial mass in a limited space. The excellent effect of is obtained.

[Brief description of the drawings]

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

FIG. 2 is a half sectional view showing a torsion damper according to a second embodiment.

FIG. 3 is a schematic cross-sectional view showing another method of manufacturing the second mass of the torsional damper according to the second embodiment.

FIG. 4 is a schematic sectional view showing still another method of manufacturing the second mass of the torsional damper according to the second embodiment.

FIG. 5 is a schematic sectional view showing a second mass of another embodiment.

FIG. 6 is a schematic sectional view showing a second mass of another embodiment.

FIG. 7 is a schematic sectional view showing a second mass of still another embodiment.

FIG. 8 is a perspective view of a main part showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st mass 2, 5 2nd mass 3 Rotation axis 4 Rubber material

Claims (1)

[Claims] 1. A torsional damper in which an inertia ring constituting a mass is attached to a plate fixed to a rotating shaft via an elastic body such as rubber, and a viscous fluid is sealed in a space formed between these three members. The torsion damper, wherein the mass comprises a combination of two or more press materials or a combination of a casting material and a press material.