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US 6,332,857 B1Granted
Loading cam device for, an apparatus for measuring thrust of a loading cam device for, and a method of assembling a toroidal-type continuously variable transmission
AssigneeNsk Ltd.
InventorsKouji Ishikawa, Kiyotaka Hirata, Mitsuo Kumagae
Life of this patent
Estimating the term…
Abstract
In a state where an input shaft 15a, an input side disk 2A and a loading cam device 9 are assembled together, thrust to be generated by the loading cam device 9 is measured. In case where this thrust is within a specified range, the other component parts of a toroidal-type continuously variable transmission are combined with the above assembled parts to thereby produce the toroidal-type continuously variable transmission. Accordingly it is possible to reduce the manufacturing cost of a toroidal-type continuously variable transmission which is excellent in efficiency and durability.
Claims11
A loading cam device for a toroidal-type continuously variable transmission comprising:
- an input shaft including a flange portion at its one end portion;
- a circular-ring-shaped cam plate supported on the inner surface of the flange portion of said input shaft, the circular-ring-shaped cam plate including, at its inner surface, a drive side cam surface which comprises an uneven surface extending in the circumferential direction of said cam plate;
- an input side disk including an outer surface and an inner surface, and the input side disk being supported by the input shaft in such a manner that it is allowed not only to shift in the axial direction of the input shaft with respect to the input shaft but also to rotate in synchronization with the input shaft, the outer surface being disposed opposed to the drive side cam surface of the cam plate and formed as a driven side cam surface comprising an uneven surface extending in the circumferential direction of the input side disk, and the inner surface being disposed on the opposite side to the outer surface in the axial direction of the input side disk and formed as a concave-shaped surface having an arc-shaped section;
- a plurality of rollers respectively held by and between the drive side cam surface and the driven side cam surface;
- and
- a retainer for holding the plurality of rollers in a freely rotatable manner,
- wherein, of the loading cam device, not only the input shaft, the cam plate, the input side disk, the rollers and the retainer which are parts produced separately from one another, are previously assembled so as to have such positional relationship that should be provided after completion of assembly of a toroidal-type continuously variable transmission, before they are actually assembled to the toroidal-type continuously variable transmission, but also the thrust of the loading cam to be generated due to the mutual relative rotation between the cam plate and the input side disk is previously measured.
4 more elements
An apparatus for measuring thrust of a loading cam device for a toroidal-type continuously variable transmission, wherein said loading cam device comprises,
- an input shaft including a flange portion at its one end portion;
- a circular-ring-shaped cam plate supported on the inner surface of the flange portion of said input shaft, the circular-ring-shaped cam plate including, at its inner surface, a drive side cam surface which comprises an uneven surface extending in the circumferential direction of said cam plate;
- an input side disk including an outer surface and an inner surface, and the input side disk being supported by the input shaft in such a manner that it is allowed not only to shift in the axial direction of the input shaft with respect to the input shaft but also to rotate in synchronization with the input shaft, the outer surface being disposed opposed to the drive side cam surface of the cam plate and formed as a driven side cam surface comprising an uneven surface extending in the circumferential direction of the input side disk, and the inner surface being disposed on the opposite side to the outer surface in the axial direction of the input side disk and formed as a concave-shaped surface having an arc-shaped section;
- a plurality of rollers respectively held by and between the drive side cam surface and the driven side cam surface;
- and
- a retainer for holding the plurality of rollers in a freely rotatable manner,
- wherein said thrust measuring device comprises:
- a drive member for rotationally driving said cam plate;
- a retaining member for preventing said input disk from shifting in a direction where said input side disk goes away from said cam plate;
- and
- a sensor for measuring a thrust load applied to said input side disk due to said rotation of said cam plate driven by said drive member, and
- wherein said sensor measures the thrust of said loading cam device which includes said drive side cam surface, said driven side cam surface and said rollers, in a state where said input shaft, said cam plate, said input side disk, said rollers and said retainer are previously assembled so as to have such positional relationship that is provided after completion of assembly of the toroidal-type continuously variable transmission before they are actually assembled to said toroidal-type continuously variable transmission.
9 more elements
A method for assembling a toroidal-type continuously variable transmission, said toroidal-type continuously variable transmission comprising:
- an input shaft including a flange portion at its one end portion;
- a circular-ring-shaped cam plate supported on the inner surface of the flange portion of the input shaft, the circular-ring-shaped cam plate including, at its inner surface, a drive side cam surface which comprises an uneven surface extending in the circumferential direction of the cam plate;
- an input side disk including an outer surface and an inner surface, and the input side disk being supported on the periphery of the input shaft in such a manner that it is allowed not only to shift in the axial direction of the input shaft with respect to the input shaft but also to rotate in synchronization with the input shaft, the outer surface being disposed opposed to the drive side cam surface of the cam plate and formed as a driven side cam surface comprising an uneven surface extending in the circumferential direction of the input side disk, and the inner surface being disposed on the opposite side to the outer surface in the axial direction of the input side disk and formed as a concave-shaped surface having an arc-shaped section;
- a plurality of rollers respectively held by and between the drive side cam surface and the driven side cam surface;
- and
- a retainer for holding the plurality of rollers in a freely rotatable manner,
- said assembling method comprising the steps of:
- previously assembling said input shaft, said cam plate, said input side disk, said rollers and said retainer which are parts produced separately from one another so as to have such positional relationship that is provided after completion of assembly of said toroidal-type continuously variable transmission, before they are actually assembled to said toroidal-type continuously variable transmission, thereby forming the loading cam device;
- measuring thrust to be generated due to the mutual relative rotation between said cam plate and said input side disk of said loading cam device;
- and, after then,
- measuring thrust to be generated due to the mutual relative rotation between said cam plate and said input side disk of said loading cam device;
- and, after then,
- combining said loading cam device with other component parts of said toroidal-type continuously variable transmission, thereby completing assembly of said toroidal-type continuously variable transmission.
10 more elements
Dependencies are inferred from the claim text.