JP2012207778A5 - - Google Patents

Claims (1)

An input shaft, an output shaft, a sun roller, an annular roller, a plurality of intermediate rollers, and a loading cam device;
Of these, the sun rollers are concentric to each other with a pair of sun roller elements divided in the axial direction around the input shaft, with a gap between the tip surfaces of the elements. The outer peripheral surfaces of the two sun roller elements are inclined surfaces that are inclined in a direction in which the outer diameter decreases toward the respective front end surfaces, and these two inclined surfaces are arranged. Rolling contact surface,
The annular roller is arranged concentrically with the sun roller around the sun roller, and has an inner peripheral surface as a rolling contact surface.
Each of the intermediate rollers is centered on a rotation shaft disposed in parallel with the input shaft at a plurality of locations in the circumferential direction of the annular space between the outer peripheral surface of the sun roller and the inner peripheral surface of the annular roller. In a state of being rotatably supported, each outer peripheral surface is in rolling contact with the outer peripheral surface of the sun roller and the inner peripheral surface of the annular roller,
The loading cam device is provided between a movable sun roller element, which is at least one of the sun roller elements, and the input shaft, and the movable sun roller is rotated along with the rotation of the input shaft. The element is rotated while being pressed in the axial direction toward the other sun roller element, and the driven cam surface provided at a plurality of circumferential directions on the base end face of the movable sun roller element, and the input Of the cam plate that is fixed to a part of the shaft and rotates together with the input shaft, between the drive side cam surfaces provided at a plurality of circumferential positions on one side facing the base end surface of the movable sun roller element. Each of the driving cam surfaces and the driven cam surfaces has a shape in which the depth in the axial direction gradually changes in the circumferential direction and becomes shallower toward the end portion. Are those having,
One member of the annular roller and the member supporting the rotation shaft is supported in a state where rotation around the sun roller is prevented, and the other member is coupled to the output shaft. In the friction roller type speed reducer in which the output shaft can be driven to rotate by the other member,
Wherein an end portion of the rotation axis of each intermediate roller, as well as rotatably supported by the distal end portion of the swing frame which is provided independently for each respective intermediate rollers, against the respective oscillating frame on the supporting frame, each of Supporting the rocking displacement centering on the rocking shaft that is parallel to the rotation shaft and having a phase in the rotation direction of the sun roller that is out of the rotation shaft, the rotation shaft is supported by the sun. A friction roller type speed reducer characterized in that the roller and the annular roller are supported so as to be capable of displacement in the radial direction.