JP3821182B2 - Rubber damper device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rubber damper device for reducing torsional vibration generated on a rotating shaft.
[0002]
[Related background]
This type of rubber damper device usually has a disk-shaped damper hub attached to a rotating shaft, and a double inertia ring connected to one surface of the damper hub via an annular rubber member. Each of the inertia rings constitutes a secondary vibration system for the torsional vibration system of the rotating shaft via the damper hub. Each sub-vibration system is set with a different natural frequency depending on the size of the inertia ring, so that the rubber damper device can reduce torsional vibration of the rotating shaft over a wide range of rotational speeds. .
[0003]
The manufacturing process of the rubber damper device described above includes a step of vulcanizing and bonding a plurality of inertia rings at one time to one surface of the damper hub via a rubber material. Specifically, in this step, first, the damper hub and the inertia ring are set in separate vulcanization molds. These vulcanization dies are formed so as to conform to the outer shape of the rubber damper as a finished product, and the damper hub and the inertia ring are accurately positioned with respect to each other in a state where the two vulcanization dies are combined. In this state, a vulcanized rubber material is injected between the damper hub and each inertia ring, and the above-described annular rubber member is formed. At this time, a plurality of injection holes are formed in the damper hub in advance, and one vulcanization mold in which the damper hub is set is formed with an injection path that leads to each injection hole from the outside. The other vulcanization mold is formed with a rim-shaped partition wall that partitions between adjacent inertia rings, and the top of this partition wall is the state of the damper hub with the two vulcanization molds combined. It abuts on one surface over the entire circumference. As a result, the rubber material injected between the damper hub and the inertia ring through the injection hole is partitioned by the partition wall, so that the individual inertia rings are divided between one surface of the damper hub and the inertia ring. The annular rubber member is formed.
[0004]
[Problems to be solved by the invention]
In the step of vulcanizing and molding the rubber member described above, it is particularly necessary to strongly press the vulcanization dies against each other. In other words, it is necessary to partition the rubber material injected by strongly pressing the top of the partition wall over the entire circumference against one surface of the damper hub, thereby securely dividing and molding the annular rubber member. is there.
[0005]
However, since the vulcanizing mold is strongly pressed at this time, the damper hub is often undesirably deformed. On the other hand, if the pressing force of the vulcanization mold is weakened so as not to deform the damper hub, the above-described rubber material partition becomes incomplete, and the formed annular rubber member is mutually connected. In any case, it is difficult to reliably obtain a complete product in such a situation.
[0006]
The present invention has been made on the basis of the above-mentioned circumstances, and an object of the present invention is to provide a rubber damper device which can obtain a good molded state of a rubber member in a normal manufacturing process and has a high quality as a finished product. There is to do.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the rubber damper device according to claim 1 is provided at a position corresponding to the plurality of rubber members via a rubber member that is radially divided on one surface of the damper hub with a predetermined interval. A plurality of inertial rings provided are connected to each other, and the other surface of the damper hub has a static rotational balance of the damper hub along a position corresponding to a portion between adjacent inertial rings. An annular rib serving as a margin for adjustment is provided.
[0008]
According to the rubber damper device of the first aspect, at the time of vulcanization molding of the rubber member in the manufacturing process, the portion of the damper hub with which the partition wall formed in the vulcanization mold abuts is reinforced by the annular rib provided at the corresponding position. Is done. Accordingly, the damper hub can sufficiently withstand the pressing force applied to the contact portion with the partition wall, and the deformation of the damper hub at this time can be reliably suppressed , and a predetermined interval can be provided at a position corresponding to each inertia ring. Thus, since the good annular rubber member divided is formed, the rubber damper device can reduce the torsional vibration of the rotating shaft over a wide range of rotational speed . In addition, bending vibration generated in the crankshaft vibration system can be reduced by using the annular rib as a margin for adjusting the static rotation balance of the damper hub.
[0009]
Further, on the other surface of the damper hub, a plurality of cooling fins extending radially intersects the annular rib is kicked set, reinforcement by an annular rib is obtained more strongly. And since only the cooling fin in which the rubber injection hole is formed has a wide circumferential width, the rigidity of the cooling fin can be increased and the force applied around the injection hole during the rubber injection can be sufficiently absorbed. Thus, the space for the injection hole can be secured while minimizing the weight increase.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Referring to FIG. 1, a double mass damper having a double inertia ring, that is, a large mass ring 2 and a small mass ring 4 is shown as this type of rubber damper device 1. As an example, the rubber damper device 1 is used by being attached to a crankshaft of an internal combustion engine. Specifically, a plurality of bolt holes 10 are formed in the disk-shaped damper hub 6, and the damper hub 6 is fastened to, for example, a crank pulley through these bolt holes 10.
[0011]
Referring to FIG. 2, a cross section of the rubber damper device 1 along the line II-II in FIG. 1 is shown. The large mass ring 2 and the small mass ring 4 are respectively connected to one surface of the damper hub 6 via annular rubber members 12 and 14. As is clear from FIG. 2, the annular rubber members 12 and 14 are divided in a radial direction with a predetermined interval, whereby the large mass ring 2 and the small mass ring 4 which are individual inertia rings. Each constitutes an independent sub-vibration system for the torsional vibration system of the crankshaft.
[0012]
The annular rib 8 is provided along a position corresponding to the portion 16 between the large mass ring 2 and the small mass ring 4 of the damper hub 6, and the thickness of the portion 16 in the damper hub 6 is increased by this annular rib 8. Is thicker than other parts.
In order to provide the annular rib 8 on such a damper hub 6, it is preferable to form the damper hub 6 by, for example, an aluminum alloy casting. In this case, by forming a groove for the annular rib 8 in the mold of the damper hub 6, the annular rib 8 can be simultaneously formed when the damper hub 6 is cast. The damper hub 6 is provided with an injection hole 18 for injecting a rubber material at the time of vulcanization bonding described later.
[0013]
Next, in the manufacturing process of the rubber damper device 1, a process of forming the rubber members 12 and 14 and vulcanizing and bonding the large mass ring 2 and the small mass ring 4 to the damper hub 6 will be described.
As shown in FIG. 3, in this step, first, the damper hub 6, the large mass ring 2, and the small mass ring 4 are fitted into separate vulcanization dies 20, 22, respectively. These vulcanization dies 20 and 22 have a shape that matches the outer shape of the rubber damper in the illustrated combined state, and in this state, the large mass ring 2, the small mass ring 4 and the damper hub 6 are accurately positioned with respect to each other. It has become so.
[0014]
One vulcanization mold 20 into which the damper hub 6 is inserted is formed with injection paths 24 leading to the injection holes 18 of the damper hub 6. In this step, the damper hub 6 and the large mass ring 2 and A vulcanized rubber material is injected between the small mass ring 4. On the other hand, the other vulcanization mold 22 into which the large mas ring 2 and the small mas ring 4 are inserted is formed with a rim-shaped partition wall 26 that partitions between the double rings, and in the illustrated combined state, The top portion 28 of the partition wall 26 is in contact with the portion 16 of the damper hub 6 described above. The injected rubber material is molded in conformity with the vulcanization molds 20 and 22, and at the same time, the partition between the large mass ring 2 and the small mass ring 4 is liquid-tightly divided by the partition wall 28. Molded as separate rubber members 12, 14 as shown.
[0015]
At this time, as described above, since the annular rib 8 is provided on the other surface of the damper hub 6 along the position corresponding to the portion 16, the strength at this portion 16 is sufficiently secured. Therefore, even if the two vulcanization dies 20 and 22 are pressed strongly against each other and the portion 16 is strongly pressed against the top portion 28 of the partition wall 26, the damper hub 6 is not greatly deformed.
[0016]
Next, a second embodiment will be described with reference to FIGS.
As shown in FIG. 4, in this example, a plurality of cooling fins 30 are formed on the other surface of the damper hub 6, and these cooling fins 30 intersect with the above-described annular rib 8 and extend radially. Yes. The cooling fin 32 provided at the position where the rubber injection hole 18 is formed has a circumferential width wider than that of the other cooling fins 30 in order to secure a space for the injection hole 18. Yes.
[0017]
Referring to FIG. 5, a cross section of the rubber damper device 1 taken along the line VV in FIG. 4 is shown. As shown in FIG. 5, also in the second embodiment, the annular rib 8 is formed at a position corresponding to the portion 16 on the other surface of the damper hub 6. In this case, since the cooling fins 30 and 32 are provided so as to intersect the annular rib 8, the reinforcement to the portion 16 of the damper hub 6 is increased accordingly.
[0018]
According to the rubber damper device of each of the above-described embodiments, when the large mass ring 2 and the small mass ring 4 are vulcanized and bonded, deformation that occurs in the damper hub 6 can be suppressed, so that the rubber members 12 and 14 are reliably formed. At the same time, product accuracy can be improved. Further, by increasing the rigidity of the overall damper hub 6 by the annular rib 8 or the like, vibration noise generated from the damper hub 6 during operation of the internal combustion engine can be reduced.
[0019]
In addition, the annular rib 8 demonstrated in each Example is useful also as a processing margin for adjusting the static rotational balance in the damper hub 6 single item. In this case, the ring rib 8 is processed to an extent that does not impair the strength of the damper hub 6 and the static balance is adjusted, so that bending vibration generated in the crankshaft vibration system is reduced and the bending vibration of the crankshaft is caused. Radial rubber distortion can be reduced.
[0020]
Moreover, since the strength of the damper hub 6 at the time of vulcanization is ensured by the annular rib 8, it is possible to suitably use an aluminum alloy casting as the material of the damper hub 6 which has been conventionally made of steel. is there. Therefore, this rubber damper device greatly contributes to the weight reduction of the damper hub 6 and the improvement of the moment of inertia ratio in the inertia ring. Further, by improving the moment of inertia ratio, a damping action is obtained with a relatively small amplitude, and the reliability as a rubber damper device is improved.
[0021]
Further, if the cooling fins 30 and 32 are provided as in the second embodiment, the heat dissipation is improved in addition to the above-described reinforcement effect, and thereby the temperature rises due to the heat generated from the rubber members 12 and 14. Can be kept low.
The present invention is not limited to the embodiments described above. In the embodiment, the damper hub 6 is formed of an aluminum alloy casting, but the material and manufacturing method of the damper hub 6 are not particularly limited. Alternatively, the damper hub 6 may be press-formed from a steel plate material, for example, and the annular rib 8 may be provided separately on the damper hub 6.
[0022]
The rubber damper device of the embodiment is a double mass type, but may be a type having three or more inertia rings on one surface of the damper hub 6.
In addition, the present invention can be widely applied not only to the crankshaft of an internal combustion engine, but also to rubber damper devices for various rotating shafts that generate torsional vibrations such as a camshaft for valve actuation and a drive shaft of a fuel injection pump.
[0023]
【The invention's effect】
As described above, according to the rubber damper device of the first aspect, the accuracy of the finished product and the reliability at the time of use can be improved, and no special attention is required in the manufacturing process. Therefore, it is possible to easily obtain a higher quality rubber damper device by using the existing production equipment as it is.
[0024]
Further, since the cooling fins are provided radially across the annular rib, the reinforcement by the annular rib can be further strengthened, the heat dissipation during use can be excellent, and it can withstand more severe use temperature conditions. Furthermore, since only the cooling fin in which the rubber injection hole is formed has a wide circumferential width, the rigidity of the cooling fin is increased and the force applied around the injection hole during rubber injection can be sufficiently absorbed. Thus, the space for the injection hole can be secured while minimizing the weight increase.
[Brief description of the drawings]
FIG. 1 is a view showing a rubber damper device according to a first embodiment;
FIG. 2 is a sectional view taken along line II-II in FIG.
FIG. 3 is a view for explaining a vulcanization bonding step during the manufacturing process of the rubber damper device.
FIG. 4 is a view showing a rubber damper device of a second embodiment.
FIG. 5 is a cross-sectional view taken along line VV in FIG.
[Explanation of symbols]
2 Large mass ring 4 Small mass ring 6 Damper hub 8 Annular rib 12, 14 Rubber member 16

Claims (1)

A disk-shaped damper hub attached to the rotating shaft;
A plurality of duplicates connected to one surface of the damper hub via an annular rubber member divided in the radial direction of the damper hub at a predetermined interval, and provided at positions corresponding to the plurality of annular rubber members The inertia ring of the
An annular rib provided on the other surface of the damper hub, along a position corresponding to a portion between the multiple inertia rings, and used as a machining margin for adjusting a static rotational balance of the damper hub;
A plurality of cooling fins provided on the other surface of the damper hub, extending radially across the annular rib, and having a rubber injection hole formed with a wide circumferential width . features and to Lula Badanpa device that.

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