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.

Abstract: A toroidal continuously variable transmission includes an input disk, an output disk facing the input disk, a power roller gripped between the input disk and output disk, a pedestal which supports the power roller free to rotate about a power roller rotation axis, and a trunnion which gyrates about a trunnion gyration axis. The trunnion includes a first plane portion perpendicular to the power roller rotation axis, two second plane portions perpendicular to the first plane portion and facing each other across the power roller rotation axis and two inclined portions between the first plane portion and the second plane portions, respectively. A roller bearing unit, including a cage housing a roller, supports the pedestal on the trunnion so that the pedestal is free to slide in a direction that is perpendicular to both the trunnion gyration axis and power roller rotation axis.

Abstract: A wall mounting structure for a dual cavity toroidal continuously variable transmission (CVT) including two toroidal speed change units. Each toroidal speed change unit includes a pair of input and output disks rotatable about a common rotation axis, the input disks being axially spaced from each other, the output disks being disposed between the input disks and axially opposed to each other in a spaced relation, and a gear set drivingly connected with the output disks. The wall mounting structure includes a transmission case accommodating the toroidal speed change units, an intermediate wall disposed between the output disks and accommodating the gear set, and a fastener fixing the intermediate wall to the transmission case and extending in a direction perpendicular to the rotation axis of the output disks.

Abstract: A toroidal continuously-variable transmission includes a tilt rotation stopper structure to limit a range of rotation of a trunnion supporting a power roller in a toroidal cavity between input and output disks, so as to prevent contact points of the power roller with the input and output disks from deviating from respective rolling contact surfaces. The tilt rotation stopper structure includes a link-side stopper provided in a lower or upper link in a region separated from a left and right tilt rotation synchronizing wire, and a trunnion-side stopper provided in a side of an axial movement limiting member.

Abstract: In a toroidal type continuously variable transmission, a pair of power rollers are operatively interposed between input and output discs. Each power roller includes a power inner roller frictionally engaged with the input and output discs, a power outer roller receiving an axial load applied to the power inner roller from the input and output discs, a ball bearing operatively interposed between the power inner and outer rollers and a shaft receiving a radial load applied to the power inner roller from the input and output discs. The shaft is a one-body member comprising a first shaft portion on which the power outer roller is coaxially and tightly disposed and a second shaft portion on which the power inner roller is coaxially and rotatably disposed. The power outer roller and the shaft are produced separately. Upon assembly, these two parts are coupled together to constitute an integrated unit.

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.

Abstract: Plural cooling passages extending radially are formed from the inner circumference to the outer circumference and within an output disk common to two toroidal transmission units. Lubricating oil which has reached an annular space between the output disk and the main shaft via holes from an oil passage in the main shaft, flows into the cooling passages inside the output disk, and the output disk is thereby cooled from inside.

Abstract: A toroidal continuously variable transmission (10) comprises input disks (18a, 20a), output disks (18b, 20b) facing the input disks, power rollers (18c, 18d, 20c, 20d) gripped between the input disks and output disks, a pedestal (94) which supports the power rollers free to rotate, trunnions (17a, 17b, 27a, 27b) and roller bearing units (96) which support the pedestals on the trunnions so that they are free to slide in the direction perpendicular to the trunnion gyration axis (19a) and power roller rotation axis (15a), and further comprises projections (100) which limit the slide amount of a cage (96a) of the roller bearing unit relative to the trunnions.

Abstract: A toroidal continuously variable transmission includes an input disk, an output disk facing the input disk, a power roller gripped between the input disk and output disk, a pedestal which supports the power roller free to rotate about a power roller rotation axis, and a trunnion which gyrates about a trunnion gyration axis. The trunnion includes a first plane portion perpendicular to the power roller rotation axis, two second plane portions perpendicular to the first plane portion and facing each other across the power roller rotation axis and two inclined portions between the first plane portion and the second plane portions, respectively. A roller bearing unit, including a cage housing a roller, supports the pedestal on the trunnion so that the pedestal is free to slide in a direction that is perpendicular to both the trunnion gyration axis and power roller rotation axis.

Abstract: A toroidal type continuously variable transmission includes trunnions (4) formed with shoulder portions (40) which oppose an upper link (5) and a lower link (6), and projections (50) on the links (5, 6) which can slide on the shoulder portions (40) when the links (5, 6) perform swinging movement. Along with forming the trunnions (4) in single units by forging, step portions (4B) are arranged between the shoulder portions (40) and sloping portions (45) of the offset portions (4A). Planar portions (40A) are formed in the shoulder portions (40) which can slide on the projections (50) by cutting or grinding so that their radiuses R from the rotation axes (4C) up to the end portions of the step portions (4B) are set in advance.

Abstract: Power rollers 18c are comprised by an inner roller 93 making frictional contact between the input and output disks 18a, 20a and an outer roller 94 supporting a contact load input from the input and output disks 18a, 20a to the inner roller 93 through a ball bearing 92. An inner radial hole 93a is provided on the inner roller 93 to support a pivot shaft 15. The inner radial hole 93a opens near the outer roller and is covered by a bottom part 93b on a side opposite to the outer roller. In this manner, compression deformation of the inner roller is suppressed when a load is applied to the inner roller. Thus smooth rotational motion of the power roller is maintained and component durability can be increased.

Abstract: A wall mounting structure for a dual cavity toroidal continuously variable transmission (CVT) including two toroidal speed change units. Each toroidal speed change unit includes a pair of input and output disks rotatable about a common rotation axis, the input disks being axially spaced from each other, the output disks being disposed between the input disks and axially opposed to each other in a spaced relation, and a gear set drivingly connected with the output disks. The wall mounting structure includes a transmission-case accommodating the toroidal speed change units, an intermediate wall disposed between the output disks and accommodating the gear set, and a fastener fixing the intermediate wall to the transmission case and extending in a direction perpendicular to the rotation axis of the output disks.

Abstract: A toroidal continuously-variable transmission includes a tilt rotation stopper structure to limit a range of rotation of a trunnion supporting a power roller in a toroidal cavity between input and output disks, so as to prevent contact points of the power roller with the input and output disks from deviating from respective rolling contact surfaces. The tilt rotation stopper structure includes a link-side stopper provided in a lower or upper link in a region separated from a left and right tilt rotation synchronizing wire, and a trunnion-side stopper provided in a side of an axial movement limiting member.

Abstract: A power roller (18c) comprises a power roller inner wheel (93) in frictional contact with a input/output disks (18a, 18b), a power roller outer wheel (94) provided in a trunnion (17a), a ball bearing (92) interposed between the power roller inner wheel (93) and the power roller outer wheel (94), and an inner wheel supporting shaft (95) which supports the power roller inner wheel (93) such that it is free to rotate, the shaft having a shaft base part (95b) supported in the trunnion (17a), and arranged so that the radial support rigidity is set high in a gyration axis direction and set low in the direction perpendicular to the trunnion gyration axis (19a) and the power roller rotation axis (15d).

Abstract: A toroidal continuously variable transmission (10) comprises input disks (18a, 20a), output disks (18b, 20b) facing the input disks, power rollers (18c, 18d, 20c, 20d) gripped between the input disks and output disks, a pedestal (94) which supports the power rollers free to rotate, trunnions (17a, 17b, 27a, 27b) and roller bearing units (96) which support the pedestals on the trunnions so that they are free to slide in the direction perpendicular to the trunnion gyration axis (19a) and power roller rotation axis (15a), and further comprises projections (100) which limit the slide amount of a cage (96a) of the roller bearing unit relative to the trunnions.

Abstract: In a toroidal type continuously variable transmission, a pair of power rollers are operatively interposed between input and output discs. Each power roller includes a power inner roller frictionally engaged with the input and output discs, a power outer roller receiving an axial load applied to the power inner roller from the input and output discs, a ball bearing operatively interposed between the power inner and outer rollers and a shaft receiving a radial load applied to the power inner roller from the input and output discs. The shaft is a one-body member comprising a first shaft portion on which the power outer roller is coaxially and tightly disposed and a second shaft portion on which the power inner roller is coaxially and rotatably disposed. The power outer roller and the shaft are produced separately. Upon assembly, these two parts are coupled together to constitute an integrated unit.

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 elliptical slotted hole. A disk-shaped member is mounted on and fitted to a lubricating oil supply pipe attached to the trunnion power-roller accommodating portion. The slotted hole and the disk-shaped member are fitted to each other to define a specified permissible 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.

Abstract: In a toroidal type continuously variable transmission, shoulder portions are formed on a trunnion which opposes an upper link or a lower link, and projecting portions are formed on the links which slidably contact the shoulder portions when the links execute swinging movement. The end portions of the projecting portions which slidably contact the shoulder portions are formed with arcuate faces.

Abstract: Even in the case where a driver switches a select lever from D range to N range and returns it back to D range during the running of a vehicle, a speed change control device prevents the operation of sudden speed change caused by a difference between a transmission input rotational speed and the actual input rotating speed of a toroidal transmission unit while in the N range. Accordingly, an automatic transmission comprises a forward-reverse switching mechanism, an impelling mechanism and a toroidal transmission unit which are sequentially arranged from the driving source side of a vehicle, and further comprises a speed change control device for controlling the operation of the above.

Abstract: Plural cooling passages 37a extending radially are formed from the inner circumference to the outer circumference and within an output disk 37 common to two toroidal transmission units. Lubricating oil which has reached an annular space between the output disk 37 and the main shaft 27 via holes 27f, 27g from an oil passage 27e in the main shaft 27, flows into the cooling passages 37a inside the output disk 37, and the output disk 37 is thereby cooled from inside.