JPH0259333B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a torsional damper that is attached to the end of a crankshaft or propeller shaft of an automobile.

<Prior Art> A torsional damper generally has a structure in which an inertia ring is bonded to torsion rubber bonded to the outer peripheral edge of a damper plate.

<Problems to be Solved by the Invention> In the torsional damper, since the inertia ring and the damper plate move relative to each other during torsional vibration damping, minute adhesive peeling tends to occur near the bonded area between the two and the torsion rubber. The inner peripheral surface is prone to cracks due to deterioration of the rubber over time and repeated torsional loads. If you are driving on a normal road, even if there is a slight adhesive peeling or crack, it will not affect the function if it remains without progressing, but if you drive in desert areas etc., it will kick up dust. The sand that has entered the area due to the adhesive peeling and the sliding of the crack due to the expansion and contraction of the torsion rubber performs a grinding action similar to that of a grinder, gradually eroding the area and causing a large This may lead to adhesive peeling and cracks, which may eventually lead to damage to the torsional damper.

<Means for Solving the Problems> The present invention provides an improved torsional damper that prevents the occurrence of such problems, and its characteristic structure is that a torsion rubber is bonded to the outer peripheral edge of the damper plate. In a torsional damper comprising an inertia ring bonded to the torsion rubber, a tongue piece covering the inner peripheral surface of the inertia ring is provided on the inner peripheral surface of the torsion rubber, and a tongue piece is continuous with the tongue piece on a concave curved R surface of the damper plate. It is integrally formed with chevron-shaped protrusions on both sides with their tips facing outward.

<Function> With the above configuration, the protrusions shake off the dust that is kicked up when driving in desert areas, etc., and ensure that sand does not enter or adhere to the bonding surface between the torsion rubber and the inertia ring. This will greatly extend the service life of the torsion rubber.

<Examples> Examples of the present invention will be described below with reference to the drawings.
In FIG. 1, 1 is a circular damper plate fixed to a rotating shaft such as a crankshaft. Torsion rubber 3 is bonded to both surfaces of the outer peripheral edge of this damper plate 1, and inertia rings 2 are bonded to both outer surfaces of the torsion rubber 3. Such a structure is known as a torsional damper.

The present invention provides tongue pieces 7 so as to cover the inner circumferential surface of the inertia ring 2 on the inner circumferential surface of the torsion rubber 3.
and a protrusion 4 are integrally provided.

The tongue piece 7 is formed of an outwardly inclined surface 6 and a concave curved R surface 5 continuous with the protrusion 4,
The projections 4 have a chevron shape on both sides of the damper plate 1 with their tips facing outward.

According to the torsional damper of the present invention, the torsion rubber 3 is attached along the plate surface of the damper plate 1.
The sand flowing in the direction of the inner circumferential surface of the tongue is blown away by the protrusions 4 in the outward direction, and the sand blown outward by the protrusions 4 is guided by the R surface 5 and the inclined surface 6 of the tongue piece 7 and forced outward. This also ensures that the inertia ring 2 and the torsion rubber 3 are prevented from entering the adhesive surface.

<Effects of the Invention> As described above, since the present invention prevents sand from adhering to the torsion rubber with a simple structure, it prevents sand from adhering to the torsion rubber and the inner peripheral surface of the torsion rubber. It is possible to avoid erosion damage due to sand in the cracks, greatly extending the service life of the torsion rubber, and having the special effect of maintaining the durability of the torsion damper function.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part of the present invention. 1... Damper plate, 2... Inertia ring, 3... Torsion rubber, 4... Protrusion.

Claims (1)

[Claims] 1. In a torsional damper formed by adhering an inertia ring to torsion rubber adhered to the outer peripheral edge of a damper plate, a tongue piece covering the inner peripheral surface of the inertia ring is provided on the inner peripheral surface of the torsion rubber, and a concave curve is formed with the tongue piece. A torsional damper characterized in that chevron-shaped protrusions are integrally formed on both sides of the damper plate so as to be continuous on the rounded surface of the damper plate.