JP2000213610A5 - - Google Patents

Description

Further, in the case of the structural example shown in FIG. 11, the output gear 18a is in a state where the partition wall 37 provided inside the housing is prevented from being displaced in the axial direction by a pair of angular contact ball bearings 38, 38. , Supports rotatably. On the other hand, in the case of the structural example shown in FIG. 12, the output gear 18a can be freely displaced in the axial direction. As shown in FIGS. 11 to 12 described above, a so-called double cavity type toroidal in which two input side disks 2A and 2B and two output side disks 4 and 4 are arranged in parallel with each other in the power transmission direction. The reason why the continuously variable transmission supports one or both input side discs 2A and 2B facing the cam plate 10 on the input shaft 15 by ball splines 34 and 34a in an axially displaceable manner is The following (1) and (2) .
(1) The rotations of both disks 2A and 2B are completely synchronized.
(2) While having the function of (1) , both disks 2A and 2B are displaced in the axial direction with respect to the input shaft 15 based on the elastic deformation of the constituent members accompanying the operation of the pressing device 9. Allow things.

In particular, in the toroidal continuously variable transmission of the present invention, the locking ring is formed on the first disk in a state where at least the pressing device does not press the first disk on the outer peripheral surface of the intermediate portion of the rotating shaft. It is locked to the portion exposed on the inner side surface side. Further, a plurality of convex portions projecting toward the pressing device are formed in a portion of the locking ring in the circumferential direction that matches the ball spline grooves, and these convex portions form a plurality of convex portions. It prevents each of the balls from falling out of each of the spline grooves.

In particular, in the case of the toroidal continuously variable transmission of the present invention, the ball spline is configured after the first disk is fitted onto the rotating shaft without providing a small diameter portion on the outer peripheral surface of the intermediate portion of the rotating shaft. It is possible to insert a plurality of balls to be inserted between the ball spline grooves on the inner diameter side and the outer diameter side, and to attach the locking ring to the locking groove formed on the outer peripheral surface of the rotating shaft. Therefore, extra work such as adhering the plurality of balls to the outer diameter side ball spline groove becomes unnecessary, and the assembling work of the toroidal continuously variable transmission becomes easy. Further, it is possible to realize a toroidal continuously variable transmission capable of transmitting a large torque without causing an increase in weight by sufficiently ensuring the torsional rigidity of the rotating shaft.

Claims (1)

By supporting the rotating shaft and the middle portion of the rotating shaft via a ball spline, the first disk and the first disc, which are free to rotate in synchronization with the rotating shaft and the axial displacement with respect to the rotating shaft, and the first disk Around the middle part of the rotation axis with the one disk and the inner side surfaces facing each other, the second disk that freely supports the relative rotation with respect to the rotation axis does not intersect with the rotation axis, but this rotation It consists of a tranion that swings around a pivot axis that is in a twisted position perpendicular to the direction of the central axis of the shaft, and a support shaft portion and a pivot shaft portion that are eccentric to each other. Both the first and second parts are rotatably supported by the tranion and the pivot shaft portion is rotatably supported around the displacement shaft and the pivot shaft portion. A power roller sandwiched between the inner surfaces of the disks, a part of the rotating shaft, and the first disk are provided, and the first disk is pressed toward the second disk and the first disk is pressed. The ball spline is provided with a pressing device for rotationally driving the disc, and the ball spline has an inner diameter side ball spline groove formed on the inner peripheral surface of the first disc and an outer diameter side ball spline formed on the outer peripheral surface of the intermediate portion of the rotation shaft. A groove, a plurality of balls rotatably provided between the two ball spline grooves, and a locking ring that restricts the plurality of balls from being displaced toward the inner surface side of the first disk. In the toroidal type stepless transmission comprising the above, the locking ring is formed in the first disk in a state where at least the pressing device does not press the first disk on the outer peripheral surface of the intermediate portion of the rotating shaft. It is locked to a portion exposed on the side surface side, and a plurality of protrusions protruding toward the pressing device are formed on a portion of the locking ring in the circumferential direction that matches each of the ball spline grooves. A toroidal type stepless transmission characterized in that a portion is formed, and each of the convex portions prevents each of the above balls from falling out of each of the above spline grooves.