JPS58102841A - Torsional vibration damper - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention includes an inner member connectable to a drive device in a rotationally fixed manner, and an inner member elastically and/or
The present invention relates to a torsional vibration damping device for an unbalanced drive, in particular a crankshaft transmission, with an outer member that is viscously coupled and forms a damping mass.

Internal combustion engines and all other unbalanced rotating machines also require a counterweight to balance the unbalanced forces and moments, and this counterweight can be used, for example in the form of an arcuate piece, to It is attached at the end, for example to the crankshaft flange. In this case, it is always the product of the mass and the radius from the center of gravity that is important for the equilibrium action, and not the specific shape. However, such counterweights involve additional secondary effects, which are often undesirable. This is because the moment of inertia of this counterweight increases the total moment of inertia of the transmission or rotating device and reduces the natural frequency.

Apart from this mass balance, it is also often necessary to limit the repeated torsional stresses on the crankshaft or drive shaft by the use of torsional vibration damping devices, in which case according to the present invention the damping action is elastically and ( or) increases with thicker towers of viscous-coupled damping masses. The damping device therefore also requires a corresponding amount of construction space, so that problems of location and arrangement often arise when assembling the damping device and the counterweight at the same time.

It is therefore an object of the invention to avoid these disadvantages and to
A torsional vibration damper of the first type mentioned minimizes the extra expense and space required by conventional counterweights and torsional vibration dampers and at the same time makes it possible to avoid the detrimental moments of inertia associated with counterweights. It is about providing.

According to the invention, this object is achieved in that the outer part has a center of gravity eccentric to the axis of rotation of this outer part. This eccentric mass of the outer member has the combined effect of a damping mass and a balancing mass and thereby makes it possible to provide a counterweight on the damping device itself;
The moment of inertia of the counterweight is now available as an effective damping mass and no longer forms a moment of inertia, which was previously harmful. Moreover, since the damping device is also a counterweight at the same time, the construction costs are correspondingly reduced, the problem of space is solved, and the assembly itself is also simplified because instead of installing a damping device and a counterweight, only the damping device is installed. be done. In order to obtain an eccentric center of gravity position of the outer part and thereby be able to configure this outer part as a counterweight, there are various possibilities that can be adapted to the particular conditions. Therefore, it is also possible to construct the outer member asymmetrically with respect to the axis of rotation, for example by means of thickened parts, flat parts, cavities, holes, etc. on one side. Furthermore, additional counterweights of suitable shape can be attached to the outer member, or components of materials of different weights can also be used.

Embodiments of the present invention will be described below with reference to the drawings.

An inner part 1 of the torsional vibration damping device is screwed through a screw hole 2 to a flange of a shaft (not shown), for example a crankshaft, and in rotation cooperates with an outer part 3 forming a damping mass. The outer member 3 is as follows.

An intermediate piece 5 which is connected to the inner part 1 via a radial leaf spring 4 and clamps this leaf spring 4.
In addition to the ring 6, the clamp holding the leaf spring 4 and the intermediate piece 5 also includes the two end cover plates 7, 8.

In order to be able to fulfill, in addition to the function of vibration damping, also the function of mass balance for unbalanced crankshafts or other unbalanced drives, the outer part 3 is designed such that its center of gravity is relative to the axis of rotation. It is constructed so that it is eccentric. This can be done, for example, through holes distributed on one side in the intermediate piece 5 or, in the illustrated embodiment, of a cover plate 8 with a thickened wall 8' extending over only part of the recesses. Depending on the particular configuration, it can be realized in different ways. However, it goes without saying that holes and thickened portions 8' can also be provided to enhance the mass balancing effect. However, due to the various possibilities for decentering the center of gravity of the outer part, the invention is not limited to specific means for configuring the outer part as a counterweight, but also includes all suitable possibilities for this purpose. It should be included.

Due to the eccentricity of the damping mass, the torsional vibration damper according to the invention simultaneously acts as a counterweight for the mass balance of the unbalanced drive, so that a separate counterweight is not necessary and the arrangement of the damper and the counterweight is The location problem is solved naturally, the configuration cost is reduced accordingly,
It goes without saying that harmful secondary effects of the counterweight on the drive are eliminated and installation is simplified.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a half cutaway end face of a torsional vibration damping device according to the present invention, and FIG. 2 is a sectional view of this torsional vibration damping device. DESCRIPTION OF SYMBOLS 1... Inner member, 3... Outer member, 4... Leaf spring, 5... Intermediate piece, 6... Tightening ring, 7, 8... Lid plate Gesellshaft Mitsupe Schlenktel Haftsung

Claims (1)

[Claims] An unbalanced drive, in particular a crankshaft, having an inner member connectable to the drive in a rotationally fixed manner and an outer member which is elastically and/or viscously coupled to this inner member and forms a damping mass. Torsional vibration damping device for a transmission device, characterized in that the outer member (3) has a center of gravity eccentric to the axis of rotation of this outer member.