Steel spring damper
View Patent ↗A damper is shown for damping the movements of a spring. The spring is housed within the damper. The side walls of the damper have inverted T-shaped cutouts and hinge members resulting in flexure of the side walls when the spring is compressed or released. A steel band can be housed on the outside surface of the side walls providing biasing of the inside of the side walls against the outside of the spring thereby damping movement of the spring.
1. A device for damping oscillations in a spring of an engine valve having a stem, the device comprising:
a cup shaped damper having a top edge and a bottom, a side wall having an inner surface and an outer surface, two hinge members attaching the side wall to the bottom, a vertical cutout on each side of the hinge members;
an axis in the center of the damper, a hole in the bottom, the hole centered on the axis;
a pair of T-shaped slots bifurcating the side wall into two side walls, the T-shaped slots having a vertical spacing and a circumferential gap, the vertical spacing starting near the bottom and extending to and open at the top edge, the circumferential gap adjacent to the bottom extending from one hinge member to the other hinge member and approximately centered on the vertical spacing;
two pair of vertical lips on each vertical spacing, one lip located on each side of the vertical spacing near the top edge and one lip located on each side of the vertical spacing near the bottom, the lips bent away from the axis;
the bottom extending from near the inner surface toward the axis terminating at a step;
the step attached to a cylinder, the cylinder extending towards the top edge, the step and cylinder centered on the axis;
a seal affixed to the cylinder near the top edge, the seal for sealing the stem of the valve;
a band located on the outer surface of the side walls, the band located and retained between the top and bottom vertical lips; and
the band providing radial tension to the outer surface of the side walls such that the inner surface of the side walls contacts the spring and the spring oscillations are damped.
2. The device of claim 1 , wherein:
the vertical spacing is parallel to the axis.