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US 7,077,023 B2Granted
Toroidal continuously variable transmission
AssigneeNissan Motor Co., Ltd.
InventorsHaruhito Mori, Jun Sugihara
Life of this patent
Estimating the term…
Abstract
In a toroidal continuously variable transmission, a roller-and-cage bearing assembly is interleaved between a power-roller outer ring and a trunnion power-roller accommodating portion to permit a parallel translation of a power roller in an axial direction of input and output disks. A cage of the roller-and-cage bearing assembly is formed with an oval slotted hole. A disk-shaped member is attached to the trunnion power-roller accommodating portion. The slotted hole and the disk-shaped member are fitted to each other to define a predetermined clearance that limits a displacement of the roller-and-cage bearing assembly in a direction perpendicular to both a rotation axis of the power roller and a trunnion axis to a set displacement.
Claims9
A toroidal continuously variable transmission comprising:
- input and output disks coaxially arranged and opposing each other;
- a power roller interposed between the input and output disks under axial preload, the power roller comprising a power-roller inner ring kept in contact with the input and output disks, a power-roller outer ring receiving a contact pressure transferred from the input and output disks to the power-roller inner ring under the axial preload, and a power-roller bearing interleaved between the power-roller inner and outer rings;
- a power-roller support comprising a trunnion having a power-roller accommodating portion that supports the power roller to permit a tilting motion of the power roller about a trunnion axis perpendicular to a rotation axis of the power roller;
- a roller-and-cage bearing assembly interleaved between the power-roller outer ring and the power-roller accommodating portion to permit a parallel translation of the power roller in an axial direction of the input and output disks, the roller-and-cage bearing assembly comprising:
- (a) a cage formed with a plurality of roller holes, and
- (b) a plurality of rollers respectively mounted in the plurality of roller holes,
- the cage having a portion defining a slotted hole;
- and
- a protruded portion attached to the power-roller accommodating portion so that the protruded portion extends from the power-roller accommodating portion toward the cage in a direction of the rotation axis of the power roller;
- wherein the slotted hole and the protruded portion are loosely fitted to each other to define a predetermined clearance between the slotted hole and the protruded portion, the predetermined clearance being determined to permit a set displacement of the roller-and-cage bearing assembly relative to the trunnion in a direction perpendicular to both the rotation axis of the power roller and the trunnion axis.
7 more elements
A toroidal continuously variable transmission comprising:
- input and output disks coaxially arranged and opposing each other;
- a power roller interposed between the input and output disks under axial preload, the power roller comprising a power-roller inner ring kept in contact with the input and output disks, a power-roller outer ring receiving a contact pressure transferred from the input and output disks to the power-roller inner ring under the axial preload, and a power-roller bearing interleaved between the power-roller inner and outer rings;
- a power-roller support comprising a trunnion having a power-roller accommodating portion that supports the power roller to permit a tilting motion of the power roller about a trunnion axis perpendicular to a rotation axis of the power roller, the power-roller accommodating portion comprising:
- (a) a power-roller support base surface;
- (b) a pair of upper and lower inner wall surfaces;
- and
- (c) a pair of sloped surfaces each interconnecting the power-roller support base surface and either of the upper and lower inner wall surfaces;
- a roller-and-cage bearing assembly interleaved between the power-roller outer ring and the power-roller accommodating portion to permit a parallel translation of the power roller in an axial direction of the input and output disks, the roller-and-cage bearing assembly comprising:
- (a) a cage formed with a first group of roller holes that is closely juxtaposed to each other in a direction perpendicular to both the rotation axis of the power roller and the trunnion axis and facing a first sloped surface of the pair of sloped surfaces and a second group of roller holes that is closely juxtaposed to each other in a direction perpendicular to both the rotation axis of the power roller and the trunnion axis and facing a second sloped surface of the pair of sloped surfaces;
- and
- (b) a first group of rollers mounted in the first group of roller holes and a second group of rollers mounted in the second group of roller holes to receive both a force component acting on the power roller in a direction of the rotation axis of the power roller and a force component transmitted from each of the input and output disks to the power roller and acting in a direction of the trunnion axis;
- wherein the cage comprises a portion defining a slotted hole;
- a protruded portion attached to the power-roller support base surface of the power-roller accommodating portion so that the protruded portion extends from the power-roller support base surface toward the cage in the direction of the rotation axis of the power roller;
- wherein the slotted hole and the protruded portion are loosely fitted to each other to define a predetermined clearance between the slotted hole and the protruded portion, the predetermined portion being determined to permit a set displacement of the roller-and-cage bearing assembly in a direction perpendicular to both the rotation axis of the power roller and the trunnion axis, while defining a lesser clearance along a direction of the trunnion axis.
11 more elements
Dependencies are inferred from the claim text.