JPH0232907Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a torsional vibration prevention damper that is attached to the crankshaft of an engine to prevent torsional vibration of the crankshaft, and more specifically to a so-called viscous rubber damper that uses rubber and viscoelastic fluid. This invention relates to a torsional vibration prevention damper in which the damping performance of a viscoelastic fluid changes depending on the amount of strain in a rubber portion.

Conventionally, dampers that utilize elastic and viscous friction by interposing rubber or a similar elastic body, viscous fluid, or a damper mounting body between the left and right damper masses have been proposed, for example, as described in Japanese Utility Model Publication No. 51-29433. Furthermore, a torsional vibration bumper in which an elastomer member and a viscous fluid are interposed between an inertial member and a boss member is known as described in, for example, Japanese Patent Publication No. 14568/1983. Regarding the conventional technology, the conventional viscous rubber damper shown in FIGS. 1 to 3 will be explained. As shown in FIG. 1 in a vertical cross-sectional view and in FIG. 2 in a plan view, a metal disc 1 is The outer circumferential portion faces into a circumferential groove portion 3 formed on the inner circumferential surface of the annular inertia weight member 2. The circumferential groove portion 3 is formed in two stages, and consists of a step portion 3A facing a portion near the outer peripheral edge of the disk 1, and a step portion 3B facing a portion along the inner peripheral edge of the disk 1. The inertia weight member 2 is an integral member made of ring members 2A, 2A having the same shape and placed face-to-face. In the stepped portion 3B, annular rubber elastic members 4, 4 are brought into contact with both surfaces of the disc 1, and are interposed between the inertial weight member 2 and the disc 1.

Further, in the stepped portion 3A, a viscoelastic fluid 5 such as silicone oil is filled between the disk 1, the inertial weight member 2, and the rubber elastic bodies 4, 4 over the entire circumference. The ring members 2A, 2A are assembled with the disk 1, the rubber elastic bodies 4, 4, and the viscoelastic fluid 5, and then are integrally joined by welding 6 at the outer peripheral edge portion of the seam.

That is, the conventional torsional vibration prevention damper applies inertial weight to a disk 1 shown in FIGS. 1 and 2 and shown in a plan view in FIG. 3 through a rubber elastic body 4 and a viscoelastic fluid 5. The member 2 is an attached damper, and even if the amount of strain in the rubber elastic body 4 changes due to torsional vibration, the shape of the damping part by the viscoelastic fluid 5 does not change, so when the torsional vibration increases, the rubber elastic body 4 heats up, decreases hardness, increases strain, and eventually leads to destruction.

The inventor of the present invention, who continued his research to solve the above problem, came to the conclusion that the cause was that the disc 1 was flat and the viscoelastic fluid 5 could not provide sufficient damping ability, and he decided to solve the problem. It was found that a structure in which a viscoelastic fluid is sealed and the volume of a part changes can be used.

The purpose of the present invention is to provide a torsional vibration prevention damper that is highly durable and has a high damping effect, and based on the above knowledge, the opposing member of the disk containing the viscoelastic fluid and the inertial weight member is formed into a spirally uneven part. It is characterized by the following points.

In order to achieve the above-mentioned purpose, the torsional vibration prevention damper of the present invention has spiral line-like unevenness on both surfaces of the outer circumferential portion of the disc, and spiral line-like unevenness in which the convex faces into the recess of the unevenness. A rubber elastic body is provided between the disk and a portion near the inner circumference of the inertial weight member, and a viscoelastic fluid is interposed between the uneven portion of the disk and the inertial weight member. Let them do it.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIG. 4 shows a longitudinal sectional view of an embodiment of the damper of the present invention, and FIG. 5 shows a disk in a plan view. In the damper of the present invention, the inertial weight member 2' is brought into contact with the disc 1 via the rubber elastic bodies 4, 4 and the viscoelastic fluid 5, and the inertial weight member 2'
A circumferential groove portion 3' consisting of step portions 3'A and 3'B is provided in the inertial weight member 2' and a ring member 2' of the same shape.
It is similar to the conventional damper in that A and 2'A are face-to-face and the outer periphery of the seam is joined by welding 6, but the part near the outer periphery of disk 1' and this part are Step portion 3'A of facing inertial weight member 2'
are formed into spiral line-shaped uneven parts 7 and 8 which are a combination of uneven parts facing each other, and a viscoelastic fluid 5 is sealed in the bent space formed by these uneven parts 7 and 8. are different.

In the viscoelastic fluid 5 existing between the spiral concavo-convex portions 7 and 8, as the torsional vibration approaches the maximum, the gap narrows on the outside in the radial direction and widens on the inside, so as the torsional vibration increases. , exhibits sufficient distortion reduction effect.

As mentioned above, in the damper of this invention, the shape of the portion near the outer peripheral edge of the disk and the opposing portion of the inertial weight member that this portion faces is formed into a concave and convex portion that meshes with each other in a spiral shape. Since an elastic fluid is enclosed, when torsional vibration becomes large, the viscoelastic fluid is compressed and generates heat, demonstrating excellent damping ability.

[Brief explanation of the drawing]

Figures 1 to 3 show conventional dampers.
The figure is a longitudinal sectional view, FIG. 2 is a plan view, FIG. 3 is a plan view of a disc, FIGS. 4 and 5 show an embodiment of the damper of the present invention, FIG. 4 is a longitudinal sectional view, and FIG. is a plan view of the disk. 1, 1'... Disc, 2, 2'... Inertial weight member,
3, 3'... Circumferential groove portion, 4... Rubber elastic body, 5...
Viscoelastic fluid, 6... Welding, 7, 8... Spiral line-like uneven portion.

Claims (1)

[Scope of utility model registration request] A spiral line-shaped uneven part is provided on both surfaces of the portion near the outer periphery of the disc, and a spiral line-shaped uneven part is provided on the inner surface of the inertial weight member, and the convex part faces into the concave part of the uneven part. A torsional vibration prevention damper comprising a rubber elastic body interposed between the inner circumferential portion of the inertial weight member, and a viscoelastic fluid interposed between the disc and the uneven portion of the inertial weight member.