JP3555629B2 - damper - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a damper attached to, for example, the shaft end of a crankshaft of an automobile engine and having a vibration control function mainly in the torsional direction of the crankshaft by two sets of resonance systems including a mass body and an elastomer member.
[0002]
[Prior 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 denotes a hub attached to the shaft end of a crankshaft (not shown) of an engine, 102 denotes a sleeve 102a fitted on the outer peripheral surface of an outer cylindrical portion 101a of the hub 101, and An annular hub plate comprising a flange 102b extending from the front end to the inner periphery of the outer cylindrical portion 101a; 103, a mass concentrically arranged on the outer periphery of the hub 101; 104, a hub plate 102; An elastomer member 105 is vulcanized and bonded between the opposed cylindrical surfaces of the sleeve 102a and the mass body 103, and an annular second mass body 105 is disposed in the inner peripheral space 101S of the outer diameter cylindrical portion 101a of the hub 101. Reference numeral 106 denotes a second vulcanized adhesive between the second mass body 105 and the opposed end faces of the flange 102b of the hub plate 102. An elastomer member.
[0003]
[Problems to be solved by the invention]
In the damper, different torsional natural frequencies are set in a resonance system D1 including a mass body 103 and an elastomer member 104 and a second resonance system D2 including a second mass body 105 and a second elastomer member 106. By doing so, it is intended to obtain vibration damping performance in a wide rotation speed range with respect to torsional vibration caused by rotation of the crankshaft. However, in the damper as shown in FIG. 3, since it is necessary to prevent radiation noise due to the vibration of the flange 102b of the hub plate 102, a soundproof elastomer member 106a integrated with the second elastomer member 106 is provided on the front side of the flange 102b. Therefore, the flange 102b must be bent in a direction to reduce the space 101S. As a result, it becomes difficult to increase the mass of the second mass body 105, and the second resonance system A large torsional vibration reduction effect due to D2 could not be expected. Further, in the manufacture of the hub plate 102, an adhesive must be applied to both surfaces of the hub plate 102 in order to vulcanize and bond the second elastomer member 106 and the soundproof elastomer member 106a to both surfaces of the flange 102b. The area became large, which hindered the improvement of productivity.
[0004]
The present invention has been made under the above circumstances, and its main technical problem is that the second mass body disposed in the inner peripheral space of the outer diameter cylindrical portion of the hub has a large size. An object of the present invention is to provide an inertial mass to improve the vibration damping performance of the second resonance system including the second mass body and the second elastomer member, and to improve the productivity of the damper.
[0005]
[Means for Solving the Problems]
As means for effectively solving the above technical problem, the damper according to the present invention includes a radial portion extending from the inner diameter boss portion and an outer diameter cylindrical portion extending from the outer diameter to the front side. A hub having an outer peripheral sleeve fitted to the outer peripheral surface of the outer diameter cylindrical portion, and an inner peripheral sleeve along the inner periphery of the outer diameter cylindrical portion from the front end of the outer peripheral sleeve. An annular hub plate formed of a flange extending along a portion and having an inner diameter end fitted to the hub, an annular mass body arranged on the outer peripheral side of the outer peripheral sleeve, and between the outer peripheral sleeve and the mass body. An elastomer member adhered to, an annular second mass body disposed in the inner peripheral space of the outer diameter cylindrical portion, and a second elastomer member adhered between the flange and the second mass body. Is provided. Here, the “front side” refers to the direction in which the shaft end to which the damper is attached faces, that is, the direction facing the engine engine crankshaft.
[0006]
[Action]
In the hub plate, the outer peripheral sleeve is fitted to the outer peripheral surface of the outer diameter cylindrical portion of the hub, and the inner diameter side flange extending along the radial direction portion of the hub is also fitted to the hub. Since both the outer diameter side and the inner diameter side are fixed to the hub, generation of radiated sound due to vibration of the hub plate is suppressed. For this reason, it is not necessary to provide an anti-vibration elastomer member on the flange of the hub plate, and accordingly, the second mass body disposed in the inner peripheral space of the outer diameter cylindrical portion is enlarged to increase its inertial mass. As a result, the vibration reduction function can be improved.
[0007]
【Example】
FIG. 1 is a half sectional view showing a first embodiment of a damper of the present invention by cutting along a plane passing through an axis O thereof. In the damper of this embodiment, the hub 1 has an inner diameter boss 11 attached to the shaft end of the crankshaft of the engine, a radial portion 12 extending from the inner diameter boss 11 to the outer diameter side, It has a substantially L-shaped cross-sectional shape including an outer diameter cylindrical portion 13 extending in the axial direction from the outer diameter end of the portion 12 to the front side (left side in the figure). A hub plate 2 is fixed to the hub 1. The hub plate 2 includes an outer peripheral sleeve 21 fitted on the outer peripheral surface of an outer diameter cylindrical portion 13 of the hub 1, and a front end of the outer peripheral sleeve 21. The inner peripheral sleeve 22 is folded back from the inner peripheral side to extend along the inner periphery of the outer cylindrical portion 13, and further extended from the inner peripheral sleeve 22 along the radial portion 12 of the hub 1 to have an inner diameter. The end 23a comprises a flange 23 fitted to a step of the inner diameter boss 11 of the hub 1.
[0008]
An annular mass body 3 having a pulley groove 31 on the outer peripheral surface is concentrically disposed on the outer peripheral side of the outer diameter cylindrical portion 13 of the hub 1, that is, on the outer peripheral side of the outer peripheral sleeve 21 of the hub plate 2. An elastomer member 4 is vulcanized and bonded between the outer peripheral surface of the mass 21 and the inner peripheral surface of the mass body 3 radially opposed thereto, and the hub 1 and the mass body 3 are elastically connected by the elastomer member 4. ing. On the other hand, an annular second mass body 5 is arranged on the front side of the radial portion 12 of the hub 1 and in the inner peripheral space 1S of the outer diameter cylindrical portion 13, and the flange 23 of the hub plate 2 and the A second elastomer member 6 is vulcanized and bonded between the tapered surface on the back side of the second mass body 5 facing in the axial direction, and the hub 1 and the second elastomer member 6 are formed by the second elastomer member 6. Are elastically connected.
[0009]
This damper provides a first resonance system D1 composed of the mass body 3 and the elastomer member 4 and a second resonance system D2 composed of the second mass body 5 and the second elastomer member 6 with different natural vibrations in the torsional direction. By setting the number, torsional vibration caused by rotation of the crankshaft is effectively damped in a wide rotation speed range. In addition, since the second elastomer member 6 is a shear spring not only in the torsion direction but also in the radial direction, the resonance system D2 composed of the second mass body 5 and the second elastomer member 6 has a bending direction. (Perpendicular to the axis).
[0010]
The flange 23 of the hub plate 2 is not provided with the vibration damping elastomer member as described in the conventional example of FIG. However, in the hub plate 2, the outer peripheral sleeve 21, which is a bonding portion with the elastomer member 4 in the first resonance system D 1, is fitted on the outer peripheral surface of the outer diameter cylindrical portion 13 of the hub 1 and the inner diameter end of the flange 23. 23a is fitted to the inner diameter boss portion 11 of the hub 1, that is, integrated with the hub 1 on both the outer diameter side and the inner diameter side. Radiated sound is effectively prevented.
[0011]
Further, according to this embodiment, the inertial mass of the second mass body 5 can be made sufficiently large, as is clear from the comparison with the second mass body 105 in the conventional example of FIG. This is because the hub plate 2 has a shape having an inner peripheral sleeve 22 along the inner circumference of the outer diameter cylindrical portion 13 of the hub 1 and a flange 23 along the radial portion 12. This is because the size in which the second resonance system D2 can be attached in the inner circumferential space 1S of the thirteenth has been enlarged. Therefore, the second resonance system D2 is provided with an excellent vibration damping function in the torsional direction and the bending direction.
[0012]
This damper vulcanizes and bonds the elastomer between the outer peripheral sleeve 21 of the hub plate 2 and the mass body 3 and between the flange 23 of the hub plate 2 and the second mass body 5, respectively. Although they are manufactured by fitting and integrating with each other, in the bonding, an adhesive is applied to the hub plate 2 only on one side. That is, it will be easily understood from FIG. 1 that the bonding surface of the hub plate 2 with the elastomer member 4 and the bonding surface with the second elastomer member 6 are on the same surface. Therefore, the productivity can be improved as compared with the conventional example of FIG. 3 in which the adhesive has to be applied to both surfaces of the hub plate in a large area.
[0013]
In addition, as shown in FIG. 2 showing a second embodiment of the present invention, the inner diameter end 23a of the flange 23 of the hub plate 2 is bent in the axial direction, and a step formed on the inner diameter boss 11 of the hub 1 is formed. The flange 23 can be securely fixed to the hub 1 by providing a large fitting surface and applying an elastic fitting force to the stepped portion.
[0014]
【The invention's effect】
According to the damper of the present invention, the following effects are realized.
(1) Since the inertial mass of the second mass body arranged in the inner peripheral space of the outer diameter cylindrical portion of the hub can be set large, the vibration reduction effect is improved.
(2) Since the inner diameter end of the flange of the hub plate is fixed to the hub, the generation of radiated sound by the hub plate is prevented, and the production cost is reduced because the soundproof elastomer member is not required. .
(3) In the manufacturing process, the adhesive is easily applied to the hub plate, so that the productivity is improved.
[Brief description of the drawings]
FIG. 1 is a half sectional view showing a first embodiment of a damper according to the present invention by cutting along a plane passing through an axis O thereof.
FIG. 2 is a partially omitted cross-sectional view showing a second embodiment of the present invention by cutting along a plane passing through an axis O thereof.
FIG. 3 is a half sectional view showing an example of a damper according to a conventional example cut along a plane passing through an axis O thereof.
[Explanation of symbols]
Reference Signs List 1 hub 11 inner diameter boss portion 12 radial direction portion 13 outer diameter cylindrical portion 1S inner peripheral space 2 hub plate 21 outer peripheral sleeve 22 inner peripheral sleeve 23 flange 23a inner diameter end 3 mass body 4 elastomer member 5 second mass body 6 second Elastomer member D1 First resonance system D2 Second resonance system O Axis

Claims (1)

A hub (1) having a radial portion (12) extending from the inner diameter boss portion (11) and an outer diameter cylindrical portion (13) extending from the outer diameter to the front side;
An outer peripheral sleeve (21) fitted to the outer peripheral surface of the outer diameter cylindrical portion (13), and an inner surface extending from the front end of the outer peripheral sleeve (21) along the inner periphery of the outer diameter cylindrical portion (13). An annular hub plate (2) comprising a flange (23) extending along the radial portion (12) via a peripheral sleeve (22) and having an inner diameter end (23a) fitted to the hub (1); When,
An annular mass body (3) disposed on the outer peripheral side of the outer peripheral sleeve (21);
An elastomer member (4) bonded between the outer peripheral sleeve (21) and the mass body (3); and an annular second mass disposed in the inner peripheral space (1S) of the outer diameter cylindrical portion (13). A body (5); a second elastomeric member (6) bonded between said flange (23) and a second mass body (5);
A damper comprising:

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