JPH08326845A - Damper - Google Patents

Abstract

PURPOSE: To enhance the durability of a damper by preventing a second elastomer in an inner peripheral space of an outer cylindrical part of a hub 1 from being broken due to thermal load. CONSTITUTION: A second mass 5 is located in an inner peripheral space of an outer cylindrical part 13 on the front surface side of a radial part of a hub 1, and a flange 22 of a hub plate 2 and the second mass 5 opposing the former in the axial direction are elastically coupled with each other by a second elastomer member 6 having its outer peripheral surface which is formed with ridges 61 in a corrugated pattern at predetermined circumferential intervals. These ridges 61 increase the heat radiating area at the outer peripheral surface of the second elastomer member 6, thereby it is possible to enhance the heat radiation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a vibration damping function mainly in the torsional direction of the crankshaft by means of two sets of resonance systems, which are attached to the shaft end of a crankshaft of an automobile engine and are composed of a mass body and an elastomer member. Regarding the damper to play.

[0002]

2. Description of the Related Art Conventionally, as this type of damper, there is a so-called double mass type damper as shown in FIG. That is, in FIG. 3, reference numeral 101 is a hub attached to an axial end of a crankshaft of an engine (not shown),
Reference numeral 102 denotes an annular shape including a sleeve 102a fitted to the outer peripheral surface of the outer diameter cylindrical portion 101a of the hub 101, and a flange 102b extending from the front end (left side in the drawing) of the sleeve 102a toward the inner peripheral side. A hub plate, 103 is a mass body concentrically arranged on the outer peripheral side of the hub 101, 104 is an elastomer member vulcanized and bonded between the sleeve 102a of the hub plate 102 and the cylindrical surfaces of the mass body 103 facing each other, and 105 is the hub 101. An annular second mass body 106 is disposed in the inner peripheral space 101S of the outer diameter cylinder part 101a, and 106 is vulcanization bonded between the end surfaces of the second mass body 105 and the flange 102b of the hub plate 102 that face each other. The second elastomer member is

This damper includes a resonance system D1 including a mass body 103 and an elastomer member 104, and a second mass body 10.
5 and the second resonance system D2 including the second elastomer member 106 are set to different torsional natural frequencies, so that the vibration damping performance in a wide rotation speed range with respect to the torsional vibration accompanying the rotation of the crankshaft is set. Is what you are trying to get. A soundproof elastomer member 106a integral with the second elastomer member 106 is formed on the front side of the flange 102b for the purpose of preventing radiation noise due to vibration of the flange 102b of the hub plate 102.

[0004]

The conventional damper described above has the following problems. That is, the elastomeric member 104 and the second elastomeric member 106 are
Although it is repeatedly twisted and deformed due to vibration input and heat is generated due to internal friction, in particular, the second elastomer member 106
Since the outer peripheral portion has poor heat dissipation, the second elastomer member 106 may be cracked by heat load and may be damaged.

The present invention has been made under the above circumstances, and its main technical problem is to heat the second elastomer member in the inner peripheral space of the outer diameter cylindrical portion of the hub. This is to prevent damage due to load and improve the durability of the damper.

[0006]

As means for effectively solving the above-mentioned technical problems, the present invention provides a hub having a radial portion and an outer diameter cylindrical portion extending from the outer diameter thereof, and An outer peripheral sleeve fitted to the outer peripheral surface of the outer diameter cylindrical portion, an annular hub plate composed of a flange extending from the front end of the outer peripheral sleeve to the inner peripheral side, and an annular hub arranged on the outer peripheral side of the outer peripheral sleeve. Mass body, an elastomer member bonded between the outer peripheral sleeve and the mass body, an annular second mass body disposed in the inner peripheral space of the outer diameter tubular portion, the flange and the second mass. A damper provided with a second elastomer member formed between the bodies, wherein undulations are formed at predetermined intervals in the circumferential direction on the outer peripheral surface of the second elastomer member.

[0007]

Since the heat radiation area on the outer peripheral surface of the second elastomer member is increased by the undulations formed at the predetermined intervals in the circumferential direction, the heat radiation property from the second elastomer member is improved.

[0008]

1 is a half sectional view showing a preferred embodiment of a damper of the present invention by cutting along a plane passing through an axis O thereof.
In the damper according to this embodiment, the hub 1 includes an inner diameter boss portion 11 attached to an axial end of a crankshaft of an engine, and a radial portion 12 extending from the inner diameter boss portion 11 to an outer diameter side.
And has a substantially L-shaped cross-sectional shape including an outer diameter cylindrical portion 13 that extends axially from the outer diameter end of the radial portion 12 toward the front side (left side in the drawing). A hub plate 2 is fixed to the hub 1. The hub plate 2 includes an outer peripheral sleeve 21 fitted to the outer peripheral surface of the outer diameter cylindrical portion 13 of the hub 1, and an end portion of the outer peripheral sleeve 21 on the front side. And a flange 22 that is bent from and extends toward the inner peripheral side.

On the outer peripheral side of the outer peripheral sleeve 21 of the hub plate 2 fitted in the outer diameter cylindrical portion 13 of the hub 1, an annular mass body 3 having a pulley groove 31 on the outer peripheral surface is concentrically arranged. The elastomer member 4 is provided between the outer peripheral surface of the outer peripheral sleeve 21 and the inner peripheral surface of the mass body 3 which faces the outer peripheral sleeve 21 in the radial direction.
Is vulcanized and bonded, and the hub 1 is attached by the elastomer member 4.
And the mass body 3 are elastically connected. On the other hand, in the inner peripheral space 1S of the outer diameter cylindrical portion 13 on the front side of the radial portion 12 of the hub 1, an annular second mass body 5 is disposed, and the flange 22 of the hub plate 2 and A second elastomer member 6 is vulcanization-molded and adhered between the taper surface on the rear surface side of the second mass body 5 facing in the axial direction, and the hub 1 and the second elastomer member 6 are bonded by the second elastomer member 6. The mass body 5 is elastically connected. A soundproof elastomer member 7 is provided on the front surface of the flange 22.

On the outer peripheral surface of the second elastomer member 6, undulations 61 are formed at predetermined intervals in the circumferential direction. The undulations 61 are formed in a wavy shape as shown in FIG. 2 in which the second mass body 5 and the second elastomer member 6 are viewed in the axial direction from the radial portion 12 side of the hub 1. The number and size of the undulations 61 are set arbitrarily.

This damper has a first resonance system D1 consisting of a mass body 3 and an elastomer member 4, and a second resonance system D2 consisting of a second mass body 5 and a second elastomer member 6,
By setting different natural frequencies in the torsion direction, the torsional vibration associated with the rotation of the crankshaft is effectively damped in a wide rotational frequency range. Further, since the second elastomer member 6 can be sheared not only in the torsional direction but also in the radial direction, the second resonance system D2.
Also exhibits damping performance in the bending direction (direction perpendicular to the axis).

With the vibration damping operation of the second resonance system D2, heat is generated by internal friction in the second elastomer member 6 which is repeatedly deformed, and the amount of generated heat is the outer peripheral side where the amount of deformation in the torsion direction is large. Although it becomes higher, the heat radiation area on the outer peripheral surface of the second elastomer member 6 is larger than that of the cylindrical surface due to the formation of the undulations 61, so the heat radiation performance is improved. Therefore, deterioration of the second elastomer member 6 due to the heat load can be prevented.

As the hub 1, by adopting a skeleton type in which a plurality of openings 12a are formed in the radial portion 12 at predetermined intervals in the circumferential direction, the outer peripheral surface of the second elastomer member 6 is undulated. The air permeability to 61 can be improved, and the heat dissipation from the second elastomer member 6 can be more effectively improved. In this case, the opening 12a
With the inclined shape shown by the broken line in FIG. 1, the air flow is remarkably generated, and the positive cooling can be achieved.

[0014]

According to the damper of the present invention, the flange of the hub plate extending from the outer diameter cylindrical portion of the hub to the inner peripheral side and the second mass body arranged in the inner peripheral space of the outer diameter cylindrical portion of the hub are provided. By forming undulations on the outer peripheral surface of the second elastomer member to be connected, the heat dissipation of this second elastomer member is improved, so damage to the second elastomer member due to heat load is prevented and the durability of the damper is improved. Can be improved.

[Brief description of drawings]

FIG. 1 shows a first embodiment of a damper according to the present invention, which has an axis O
It is a half-cut sectional view cut and shown in a plane passing through.

FIG. 2 is a partial rear view of the second mass body and the second elastomer member in the above embodiment as seen in the axial direction from the radial direction side of the hub.

FIG. 3 is a half-cut sectional view showing an example of a damper according to a conventional example by cutting along a plane passing through an axis O thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 hub 11 inner diameter boss portion 12 radial direction portion 12a opening portion 13 outer diameter cylinder portion 1S inner peripheral space 2 hub plate 21 outer peripheral sleeve 22 flange 3 mass body 31 pulley groove 4 elastomer member 5 second mass body 6 second elastomer Member 61 Undulation 7 Soundproofing elastomer member D1 First resonance system D2 Second resonance system O axis

Claims (1)

[Claims] 1. A hub (1) having a radial portion (12) and an outer diameter tubular portion (13) extending from its outer diameter, and a hub (1) fitted to the outer peripheral surface of the outer diameter tubular portion (13). An outer peripheral sleeve (21) and an annular hub plate (2) comprising an outer peripheral sleeve (21) and a flange (22) extending from the front end of the outer peripheral sleeve (21) to the inner peripheral side, and an outer peripheral side of the outer peripheral sleeve (21). An annular mass body (3) arranged, an elastomer member (4) adhered between the outer peripheral sleeve (21) and the mass body (3), and an inner peripheral space (of the outer diameter tubular portion (13) ( 1S), an annular second mass body (5), and a second elastomer member (6) formed between the flange (22) and the second mass body (5), The outer peripheral surface of the second elastomer member (6) has undulations (61) formed at predetermined intervals in the circumferential direction. Damper characterized by.