Roller bearing with rolling bodies of a shape memory alloy
View Patent ↗The anti-friction bearing has an outer bearing ring, an inner bearing ring and rolling bodies that are located between the bearing rings. The race of the outer bearing ring and the inner bearing ring are laterally delimited by two continuous rims that are formed as one piece with the races. The bearing is filled with the rolling bodies through the free space between the two rims. A partial quantity of the rolling bodies is made of a shape memory alloy, the cross-section of the bodies being deformed to fit the dimensions of the free space between the rims. After introduction into the bearing and once they have reached a specific temperature, the bodies regain their original shape.
1. An anti-friction bearing, having an outer bearing ring and of an inner bearing ring and rolling bodies which are arranged between the bearing rings and which roll on a raceway of the outer bearing ring and on a raceway of the inner bearing ring without any cage guidance with respect to one another, wherein both the raceway of the outer bearing ring and the raceway of the inner bearing ring are delimited laterally by two peripherally continuous rims connected in one piece to said ring and at least a subset of rolling bodies consisting of a shape memory alloy which are deformed in cross section to the dimension of a free space between the rims of the bearing rings for insertion and, after insertion into the anti-friction bearing automatically assume, when a predetermined temperature is reached, their original shape corresponding to the shape of the remaining rolling bodies.
2. The anti-friction bearing as claimed in claim 1 , wherein the number of rolling bodies consisting of a shape memory alloy corresponds to about half the overall number of rolling bodies of the anti-friction bearing, the rolling bodies consisting of a shape memory alloy being arranged so as to be uniformly distributed circumferentially between the remaining rolling bodies of the anti-friction bearing.
3. The anti-friction bearing as claimed in claim 2 , wherein the rolling bodies consisting of a shape memory alloy are produced from a nickel/titanium alloy with a one-way or two-way characteristic, which is easily deformable in its martensitic low-temperature phase and assumes its original manufacturing shape during the transition to its austenitic high-temperature phase.
4. The anti-friction bearing as claimed in claim 3 , wherein both the martensitic low-temperature phase and the austenitic high-temperature phase of the shape memory alloy are fixed outside the typical operating temperatures of the anti-friction bearing.