Thermal compensation element with wave spring
View Patent ↗A thermal compensation element which has an inner ring, an outer ring, and a washer. The washer is arranged within the inner ring and the outer ring is mounted over the inner ring, encapsulating the washer, which can be a split wave spring. The inner ring and the outer ring each have retention features to ensure they are retained relative to each other. The thermal compensation, which is positioned between a housing or a shaft, can account for variations in loading and/or temperature that may occur to a bearing and a shaft system when the shaft and an associated component are made of different materials and have different coefficients of thermal expansion by ensuring a proper axial preload is maintained on the bearing.
1. A thermal compensation element, comprising:
an outer ring including:
an outer base;
a first outer wall extending from the outer base in a first direction and
bent in a second direction orthogonal to the first direction; and,
a second outer wall extending from the outer base in the first direction to form a first U-shape with the outer base and the first outer wall and including a second distal end
bent in a third direction, opposite the second direction;
an inner ring including:
an inner base; and,
a first inner wall extending from the inner base in a fourth direction, opposite the first direction; and,
a second inner wall extending from the inner base in the fourth direction to form a second U-shape with the inner base and the first inner wall; and,
a split wave spring arranged within the inner ring with the outer ring being mounted over the inner ring so as to encapsulate the washer, wherein the inner ring is displaceable with respect to the outer ring in the first and fourth directions,
wherein:
the first inner wall includes a first outer face with:
a first portion;
a first protrusion extending from the first portion in the third direction and in contact with the first outer wall; and
a second portion extending beyond the first protrusion in the fourth direction; and,
the second inner wall includes a second outer face with:
a third portion;
a second protrusion extending from the third portion in the second direction and in contact with the second outer wall; and,
a fourth portion extending beyond the second protrusion in the fourth direction; or,
wherein:
the first inner wall includes a third distal end bent in the third direction, to contact the first outer wall; and,
the second inner wall includes a fourth distal end bent in the second direction to contact the second outer wall.
2. The thermal compensation element of claim 1 , wherein the inner ring has a first channel in which the washer is arranged and the outer ring has a second channel.
3. The thermal compensation element of claim 1 , wherein the first inner wall and the second inner wall of the inner ring are of a predetermined length, providing a stop to protect the washer from plastic deformation.
4. The thermal compensation element of claim 1 , wherein the thermal compensation element is positioned between a housing/shaft system shoulder and a bearing.
5. The thermal compensation element of claim 4 , wherein the bearing is a tandem ball bearing, an angular contact ball bearing, or a tapered roller bearing.
6. The thermal compensation element of claim 4 , wherein the bearing is preloaded axially through the thermal compensation element, compressing the washer at a position between fully free and a positive stop.
7. The thermal compensation element of claim 1 , wherein the first outer face includes the first portion and the first protrusion.
8. The thermal compensation element of claim 1 , wherein the first inner wall includes the third distal end.
9. The thermal compensation element of claim 1 , wherein the second outer face includes the third portion and the second protrusion.
10. The thermal compensation element of claim 1 , wherein the second inner wall includes the fourth distal end.