JP2603205Y2 - Damper device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper device for suppressing torsional vibration of a rotary shaft such as a crankshaft of an engine.

[0002]

2. Description of the Related Art A large inertial mass is provided on one side surface of a disk-shaped damper plate which is fixed to a rotating shaft such as an engine crankshaft which generates torsional vibration and rotates integrally, via a first rubber layer. A so-called double mass torsional damper device in which a first inertia ring is mounted and a second inertia ring having a small inertia mass is concentrically mounted via a second rubber layer radially inward of the first inertia ring. It is conventionally known.

[0003] In the double mass torsional damper device, of the first rubber layer and the second rubber layer arranged side by side with a small radial gap on one side surface of the damper plate, the natural frequency is particularly large. The internal temperature of the second rubber layer that elastically supports the second inertia ring rises remarkably. If the temperature of the first or second rubber layer rises excessively, there is a problem that the durability of the rubber is impaired and the damper device is damaged early.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has a first inertia having a large inertial mass on one side of the damper plate via first and second rubber layers. In a damper device in which a ring and a second inertia ring having a small inertial mass are concentrically mounted, a temperature rise of the first and second rubber layers, particularly, a second rubber layer having a large calorific value, is effectively suppressed, and It is intended to improve the durability and reliability of the device.

[0005]

In order to attain the above object, the present invention provides a first inertia resin having a first rubber layer on one side of a damper plate which is fixed to a rotating shaft and rotates integrally.
And a second inertial ring having a smaller inertial mass than the first inertial ring via a second rubber layer radially inward of the first inertial ring, and concentrically mounting the second inertial ring . An outer peripheral portion of the other side surface of the damper plate extends radially over at least a part of a back surface of the first rubber layer and the second rubber layer, and has a radially inner side.
Numerous first coolings whose height is higher than the outer diameter
The fins are protruded and are provided on the surface of the first inertial body in the radial direction.
A plurality of second cooling fins extending from the second cooling fin are provided.
Numerous third cooling fins extending radially on the surface of the body
Protruding from the surface of the first inertial body of the second cooling fin.
The second inertial body of the third cooling fin compared to the height thereof
The present invention proposes a damper device characterized in that the height from the surface is increased .

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be specifically described below with reference to the accompanying drawings. In the figure, reference numeral 10 generally indicates a torsional damper device. The damper device 10 is a disk-shaped damper that is fixed to a rotating shaft that generates torsional vibration such as an engine crankshaft and rotates integrally with the rotating shaft. A plate 12, a first inertia ring 16 having a large inertia mass mounted on an outer peripheral portion of one side surface 12a of the damper plate 12 via a first annular rubber layer 14, and one side surface 12 of the damper plate 12;
and a second inertia ring 20 having a small inertia mass, which is mounted on a radially inner peripheral portion of a through a second annular rubber layer 18.

As shown in FIG. 1, the damper plate 12 has a central portion 22 substantially perpendicular to an axis OO of a rotation shaft such as a crankshaft of an engine, and a center portion 22 which is substantially perpendicular to the axis OO. An outer peripheral portion 24 having a conical surface inclined to the left with respect to a plane perpendicular to the orthogonal plane;
4 and a bent portion 26 connecting the two. A large number of first cooling fins 28 extending in the radial direction are provided on an outer peripheral portion of the other side surface 12b of the damper plate 12, and a rubber material is injected into the first and second rubber layers 14 and 18 at the time of manufacturing. A raised portion 34 having holes 30 and 32 is provided so as to extend in the axial direction, respectively.

In the illustrated embodiment, the first cooling fin 2
8, the top surface of each of the projections 34 is the axis OO
Are included in the same plane orthogonal to
2 of the outer peripheral portion 24 so that a conical surface inclined to the left with respect to a plane perpendicular to the axis O-O, the height h ₁ of the outer diameter side of the first cooling fin 28, the inner diameter side high It is formed sufficiently smaller than the h _2. Also, the first cooling fins 28
Is substantially all over the rear surface of the first rubber layer 14 except for a part of the outermost portion in the radial direction.
On the back surface of the rubber layer 18, the outer peripheral portion 24 is formed so as to extend over substantially the half of the outer diameter portion in the radial direction, that is, over the range substantially equal to or longer than the radial length of the outer peripheral portion 24. In addition, each of the first
Circumferential width w ₁ of the first cooling fin 28, the cavity between the cooling fins each other words, is smaller than the width w ₂ of the cooling air passage, formed to flow a sufficient cooling air between the cooling fins Have been.

Accordingly, the first cooling fin 28 has a larger surface area on the inner diameter side than the outer diameter side, that is, the cooling capacity is larger on the inner diameter side than on the outer diameter side. 14 is also cooled, but the second rubber layer 18 on the inner diameter side is also cooled.
Will cool better. As a result, since the second inertia ring 20 having a large natural frequency is supported, the second rubber layer 18 having a relatively large calorific value is effectively cooled to prevent its temperature from rising, and the durability of the damper device 10 is improved. And reliability can be improved.

Further, by reducing the circumferential width w ₁ of the first cooling fin 28 as described above, it is possible to suppress the increase of the moment of inertia of the damper plate 12 effectively. Since the resonance peak rotation speed shifts to a low rotation side due to an increase in the moment of inertia of the damper plate 12, when the damper device 10 is mounted on a rotation shaft that operates in a wide rotation speed region such as a crankshaft of an automobile engine, torsional vibration is caused. leads to deterioration of the characteristics, also not preferable become possible to cause the deterioration of overrun properties, thus reducing the width w ₁ of the first cooling fin 28 is advantageous in securing the damper performance.

Further, a large number of second inertial rings are provided on the end faces of the first inertial ring 16 and the second inertial ring 20 opposite to the rubber layer .
A cooling fin 36 and a third cooling fin 38 are provided, respectively. Each second cooling fin 36 and third cooling fin 38
(The right end face in the figure) is included in the same plane orthogonal to the center line OO. Further, the first inertia ring 1
The height _{h 11} of the second cooling fin 36 6 is sufficiently small is formed than the height _{h 12} of the second inertia ring 20, also the
Than the radial dimensional of the second cooling fin 36 third radial dimensional cooling fin 38 is slightly larger, and the second
Cooling fins 36 and the third cooling fin 38 is so provided substantially the same number on the circumference (of course there may be some number difference) than the surface area of the second cooling fin 36 of the third cooling fin 38 The surface area is large enough and therefore the cooling capacity is large enough. Therefore, similarly to the first cooling fins 28 on the damper plate 12, the second rubber layer 18 having a larger calorific value than the first rubber layer 14 is cooled more effectively, and the early damage due to the temperature rise is effectively prevented. Is done.

Further, in the illustrated embodiment, the cooling fins 28
And the top surfaces of the cooling fins 36 and 38 both
Are included in the two parallel planes perpendicular to the horizontal axis, so that the dimension H in the axial direction of the damper device 10 can be reduced. Therefore, when the damper device 10 is mounted, for example, at the front end of the crankshaft of an automobile engine, the overall length of the entire engine can be reduced, which is extremely advantageous in terms of space.

In FIG. 1, reference numeral 40 denotes an annular space formed by inserting an annular mold separating the rubber layers when the first rubber layer 14 and the second rubber layer 18 are vulcanized. And the first inertia ring 1 facing the space 40
Annular steps 42 and 44 for positioning the vulcanizing mold are formed on the edges of the sixth and second inertia rings 20.

[0014]

As described above, in the damper device according to the present invention, the first inertia ring is mounted on one side surface of the damper plate fixed to the rotating shaft and integrally rotating via the first rubber layer. A second inertia ring having a smaller inertial mass than the first inertial ring is concentrically mounted via a second rubber layer on a radially inner side of the first inertial ring. A radially extending portion extending along at least a part of the back surface of the first rubber layer and the second rubber layer on an outer peripheral portion of the other side surface, and a height on an inner diameter side;
Are formed higher than the height on the outer diameter side.
Protruding from the surface of the first inertial body and extending in the radial direction
A large number of second cooling fins projecting from the second inertia body.
A number of radially extending third cooling fins project on the surface.
From the surface of the first inertial body of the second cooling fin.
The surface of the second inertial body of the third cooling fin compared to the height
The height of the double mass torsional damper device is improved, and is useful in practical use.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a partial front view as viewed from the direction of arrow II in FIG. 1;

FIG. 3 is a partial front view as viewed from the direction of arrow III in FIG. 1;

[Explanation of symbols]

10 damper device, 12 damper plate, 14 first
Rubber layer, 16: first inertia ring, 18: second rubber layer, 2
0 ... second inertia ring, 28 ... first cooling fin, 36 ... second
2 cooling fins, 38 ... third cooling fins .

Claims (1)

(57) [Scope of request for utility model registration] 1. A fixed to the rotating shaft on one side of the damper plate which rotates integrally with the first inertia via the first rubber layer
A second inertial ring having a smaller inertial mass than the first inertial ring is mounted concentrically on the radially inner side of the first inertial ring via a second rubber layer. The outer peripheral portion on the other side surface of the damper plate extends radially over at least a part of the back surface of the first rubber layer and the second rubber layer, and the height of the inner diameter side is the outer diameter side.
Many first cooling fins formed higher than the height of the
On the surface of the first inertial body, a number of radially extending
2 a plurality of cooling fins projecting from the surface of the second inertial body,
(3) Projecting cooling fins, and setting the height of the second cooling fin above the surface of the first inertial body.
In comparison with the third cooling fin from the surface of the second inertial body.
A damper device having a high height .