JPH05180269A - Torsional damper - Google Patents

Abstract

PURPOSE:To secure adherence to elastic bodies by installing an inertial mass in an extension part through the elastic body, installing an inertial mass in an extension-part-unformed ring through the elastic body, installing a disk in a space between the two inertial masses, and sealing up viscous fluid in the space. CONSTITUTION:In parts A, a boss 2, an extension part 3, and an inertial mass 5 are set in a vulcanizing metal mold, and a rubber material 4 is filled between the extension part 3 and the inertial mass 5, and is vulcanized. A ring 7 and an inertial mass 10 are also set in a metal mold, and a rubber material 9 is filled between them, and is vulcanized, so that parts B without causing adhesive separation can be molded. A disk 6 and the parts B are embedded in the boss 2, and the parts A and B are connected to each other by means of a screw 8. The inertial masses 5 and 10 are brought into contact with each other in, the vicinity outside of the radial direction, and contact portiones are welded to each other. Viscous fluid is sealed up between the inertial masses 5 and 10. In the above-mentioned constitution, a torsional damper can be manufactured simply at low cost while precluding the possibility of causing separation in places of elastic bodies.

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 vibrations of rotary shafts such as engine crankshafts, vehicle driveshafts and propeller shafts, and more particularly to a torsional damper using viscous fluid.

[0002]

2. Description of the Related Art As a conventional torsional damper containing a viscous fluid, as shown in FIG. 8, elastic bodies 101, 102 are provided from both sides in the axial direction of a plate 100 fixed to a rotary shaft 1 such as a crankshaft. The inertial masses 103 and 104 are attached to the plate 100 via the
03, 104, elastic bodies 101, 102, and plate 100
It is known that a viscous fluid L is enclosed in a gap 105 surrounded by.

[0003]

In the conventional torsional damper, rubber is vulcanized and bonded to both sides of the plate 100 to attach the elastic bodies 101 and 102 to the inertial masses 103 and 10.
Since No. 4 was adhered to the elastic bodies 101 and 102 with an adhesive or the like, there is no problem in strength at the vulcanization adhesion portion, but there is a risk that the adhesion points between the inertial masses 103 and 104 and the elastic bodies 101 and 102 will come off. was there. Further, in order to prevent the adhesive peeling, the inertial masses 103 and 104 are divided into several parts, and the elastic bodies 101 and 102, the plate 100 and the parts are vulcanized and adhered to each other, and the other inertial masses 103 and 104 are attached to the parts. A method of welding the parts is also conceivable, but this method has the drawback of increasing the number of welding points and increasing the cost.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a torsional damper which secures adhesion to an elastic body, can be easily manufactured, and can reduce the cost.

[0005]

In order to achieve the above object, the present invention forms a ring-shaped extending portion extending in a radial direction of a hub fixed to a rotating shaft such as a crankshaft. Or / and a ring attached to the hub is formed with a ring-shaped extension extending in the radial direction of the hub, and the extension is provided with an inertia so that it is located in the axial direction of the extension via an elastic body. A mass is attached to the hub, or an inertial mass is attached to a ring or a hub that does not have an extension formed on the hub via an elastic body, and is located in a gap formed between two opposing inertial masses. As described above, the disk is attached to the hub, the viscous fluid is enclosed in the gap formed around the disk, and the ring or the ring having the extending portion, the elastic body, and the inertia mass are integrally formed. , Extension or hub with no extension and elasticity And the inertial mass is one that is integrally molded.

[0006]

In the present invention, the extension is integrally formed from the hub, and the ring on the side axially opposed to the extension is attached to the hub. Vulcanize and bond together (this is called part A), while the ring, elastic body and inertia mass are integrally vulcanized and bonded (this is called part B), then part B is fitted to the hub and fixed. However, the inertia masses may be simply welded to each other. Therefore, there is no risk of the elastic body peeling off at a portion, and the elastic body can be easily manufactured and the cost is reduced.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.

In the first embodiment shown in FIG. 1, a hub 2 is fixed to a rotary shaft 1 such as a crankshaft, and an extending portion 3 extending in the radial direction is integrally formed with the hub 2. An inertial mass 5 is attached to the extending portion 3 via an elastic body 4 in the axial direction of the extending portion 3. When rubber is used as the elastic body 4, the extension portion 3 and the inertial mass 5 are integrally formed during the vulcanization of the rubber (this is referred to as part A) so that the adhesive separation from the rubber does not occur. Keep it. A donut-shaped disc 6 is fitted and brought into contact with the surface on the left side in the axial direction in FIG. 1 of the boss 2 near the location where the ring-shaped extension 3 is integrally formed. Fix it. The disk 6 is sandwiched between the ring 7 and the hub 2, and the ring 7 has a screw 8
It is attached to the hub 2. The ring 7 is connected to the inertial mass 10 via an elastic body 9. The ring 7, the elastic body 9, and the inertial mass 10 are vulcanized and bonded when the elastic body 9 is molded with rubber. Therefore, the disk 6 is fitted into the boss 2, and then the ring 7, the elastic body 9 and the inertia mass 10 which are integrated with each other, which is called a part B, is fitted into the boss 2. At this time, the inertial mass 10 is brought into contact with the inertial mass 5 in the vicinity of the outer side in the radial direction, and this abutting portion is welded. A gap 11 for enclosing the viscous fluid L between the inertial masses 5 and 10.
Are formed.

In the part A, as shown in FIG. 2, the boss 2 and the extending portion 3 and the inertial mass 5 are set in a vulcanizing mold, and a rubber material is placed between the extending portion 3 and the inertial mass 5. And vulcanize. Separately from this part A, a part B is integrally molded with a vulcanization mold as shown in FIG. That is, by setting the ring 7 and the inertial mass 10 in the respective molds, filling a rubber material between them and vulcanizing, a part B having no adhesive separation can be molded. The parts A and B are integrally molded, and the disk 6 is fitted into the boss 2 as shown in FIG. 4, and then the part B is also fitted into the boss 2. Then, the screw 8 is screwed into the ring 7 to join the parts A and B together.

In the second embodiment shown in FIG. 5, the extension 3 is not formed on the boss 2 side, but the extension 3'is formed on the ring 7 side. An inertial mass 5'is integrally formed with an elastic body 4 ', and an extending portion 3'is integrally formed with an inertial mass 10' with an elastic body 9 '. Therefore, the part A is composed of the boss 2, the elastic body 4'and the inertia mass 5 ', and the part B is the ring 7 here.
And an extension 3 ', an elastic body 9', and an inertial mass 10 '. A disc 6 is interposed between the inertial masses 5 ′ and 10 ′, and a viscous fluid is filled in a gap around the disc 6.

The third embodiment shown in FIG. 6 shows a combination of the part A shown in FIG. 1 and a part similar to the part B shown in FIG. 5, in which the inertial mass 5 used in the radial direction is The outer peripheral end portion is axially formed longer than that shown in FIG. 1, and the inertial mass 10 is formed shorter than that shown in FIG.

FIG. 7 shows the disk 6 and the inertial mass 5, 5.
A spacer 12 is provided between the disc 6 and the inertial masses 5 and 10 so as to maintain the space between them and the spacer 12 so as not to prevent the relative rotation of the two. The spacers 12 are fixed to, for example, the inertial mass 5 and the inertial mass 10, respectively, and the disk 6 can be slidably contacted with the spacers 12 to move. On the contrary, spacers 12 may be fixed to both sides of the disk 6 so that the spacers 12 and the inertial masses 5 and 10 can slide and move. The presence of the spacer 12 keeps the gap 11 constant. By sandwiching the disc 6 between the inertial masses 5 and 10, a large vibration damping effect can be obtained due to the flow resistance of the fluid based on the relative displacement between the disc 6 and the inertial masses 5 and 10. When it is thin and the rigidity in the axial direction is low, it is difficult to secure the dimensional accuracy of the gap 11 as it is. However, by providing such a spacer 12, even if the processing accuracy of the disk 6 is relatively low, It is possible to keep the size of the space between the inertial masses 5 and 10 constant, and thus to secure stable characteristics.

In each of the above-mentioned embodiments, the ring 7 is fixed to the hub 2 with the screw 8. However, the ring 7, the disc 6 and the hub 2 may be welded to each other. If the screw 8 is used, the welding point only needs to be one point of the inertial mass 5 and the inertial mass 10, and the welding process can be made one point.
Manufacturing cost is reduced. Further, if the disc 6 and the ring 7 are fixed to each other by non-welding means with screws 8, the number of metal fittings that are restricted by the material is reduced, and the total metal fitting cost can be reduced. Furthermore, the elastic body 4,
9 are opposed to each other with the disc 6 in between, and the chamber between them can be set to a large size, and the viscous fluid will be enclosed in this chamber, so high damping performance can also be obtained. Become. Furthermore, since there is at least one ring-shaped extending portion 3 and the inertia mass 5 is attached to the extending portion 3 in the axial direction via the elastic body 4, the radius of the elastic body 4 can be increased. A high natural frequency can be realized while suppressing the hardness of the elastic body 4 to a low level.

[0014]

As described above, according to the present invention, since the parts A and B are integrally molded, the adhesive peeling is less likely to occur. Also, the number of welding points is small, the manufacturing is easy, and the cost can be reduced. Further, in the case where the spacer is provided, it is possible to maintain a constant gap between the disk in which the viscous fluid is sealed and the respective inertial masses, so that stable characteristics can be obtained even if the disk processing accuracy is relatively low. Can be secured.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment.

FIG. 2 is a cross-sectional view showing a part A.

FIG. 3 is a sectional view showing a part B.

FIG. 4 is a cross-sectional view of a state where a disk is sandwiched between the parts A and the parts B are assembled.

FIG. 5 is a sectional view of the second embodiment.

FIG. 6 is a sectional view showing a third embodiment.

FIG. 7 is a sectional view showing an example in which a spacer is provided.

FIG. 8 is a sectional view showing a conventional example.

[Explanation of symbols]

 1 rotary shaft 2 boss 3, 3'extended part 4, 4 'elastic body 5, 5' inertial mass 6 disk 7 ring 9 and 9 'elastic body 10, 10' inertial mass 11 gap 12 spacer

Claims (2)

[Claims] 1. A hub fixed to a rotary shaft such as a crankshaft is formed with a ring-shaped extending portion extending in a radial direction of the hub and / or a ring attached to the hub is extended in a radial direction of the hub. A ring-shaped extending portion is formed, and an inertial mass is attached to the extending portion via an elastic body so as to be located in the axial direction of the extending portion, or an extending portion for attaching to the hub is formed. Inertia mass is attached to a ring or hub via an elastic body, a disk is attached to the hub so that it is located in the gap formed between two opposing inertial masses, and it is formed around the disk. The viscous fluid is enclosed in the gap, and the ring or the ring with the extension is formed, the elastic body and the inertia mass are integrally molded, and the extension or the hub without the extension is elastic. The body and the inertial mass are integrally molded Shonarudanpa. 2. A spacer is provided between the disk and the inertial mass so as not to prevent relative rotation of the disk and the inertial mass so as to maintain a distance between the disk and the inertial mass. Item 1
Torsion damper described in.