JP2002089554A5 - - Google Patents

Claims (5)

In the multi-stage thrust bearing device disposed between the shaft and the housing, a plurality of inner rings attached to the shaft, a plurality of outer rings attached to the housing, the inner ring, and the outer ring adjacent thereto are provided. Each of the rolling elements arranged, one or more inner ring spacers arranged between the plurality of inner rings, and one or more outer ring spacers arranged between the plurality of outer rings, In at least one of the spacer and the outer ring spacer, the spacer that receives a large load is larger in the radial direction than the spacer that receives a small load has a radial cross-sectional area proportional to the small load. A multi-stage thrust bearing device having a structure in which the amount of deformation generated in both spacers is close to the side to be equalized while having a cross-sectional area. In the multi-stage thrust bearing device disposed between the shaft and the housing, a plurality of inner rings attached to the shaft, a plurality of outer rings attached to the housing, the inner ring, and the outer ring adjacent thereto are provided. Rolling elements disposed respectively, inner ring spacers disposed between the plurality of inner rings, and outer ring spacers disposed between the plurality of outer rings, wherein the inner ring spacers and the outer ring spacers While receiving a different load, a spacer receiving a large load has a larger radial cross-sectional area than a case where a spacer receiving a small load has a radial cross-sectional area proportional to the small load, A multi-stage thrust bearing device having a structure in which the amount of deformation generated in both spacers is closer to the leveling side.   The multistage thrust bearing device according to claim 1 or 2, wherein the structure includes a hole or a recess formed in a peripheral surface of the inner ring spacer or the outer ring spacer. With respect to the axial direction of the compressive stiffness K _il of the inner ring spacer in the first stage, between the compressive stiffness K _in the axial direction of the inner ring spacer of the n-th stage, and the axial direction of the outer輸間seat of the n-th stage The multi-stage thrust bearing device according to any one of claims 1 to 3, wherein the following relationship is established between the rigidity K _{o (Z + 1-n)} :
0.76 × C _n × K _il <K _in <1.24 × C _n × K _il (4)
_{0.76 × C n × K il <} K o (Z + 1-n) <1.24 × C n × K il (5)
Here, C _n = (Z + 1−n) / Z, and Z is the number of steps of the spacer.   The multistage thrust bearing device according to claim 4, wherein when the thickness of the outer ring spacer is equal to the thickness of the inner ring spacer, the expressions (4) and (5) are satisfied.