JP2013104545A5 - - Google Patents

Claims (1)

An input shaft, an output shaft, a sun roller, an annular roller, a plurality of intermediate rollers, a pair of loading cam devices, and an elastic member;
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 tip surfaces, Both inclined surfaces are rolling contact surfaces,
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 provided 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, and each of the intermediate rollers is disposed in parallel with the input shaft. 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 in a state of being rotatably supported around an axis,
The two loading cam devices are provided at two positions sandwiching the sun roller from both sides in the axial direction, and rotate the two sun roller elements while pressing the sun roller elements toward each other as the input shaft rotates. Therefore, a driven cam surface provided at a plurality of locations in the circumferential direction of the base end surfaces of the two sun roller elements, and arranged around the input shaft in a state in which axial displacement and rotation with respect to the input shaft are prevented. Each of the drive side cam surfaces and each of the driven side cam surfaces are sandwiched between drive side cam surfaces provided at a plurality of circumferential positions on one side of the cam plate. Each has a shape in which the depth in the axial direction gradually changes in the circumferential direction and becomes shallower toward the end,
The elastic member provides a preload for securing the surface pressure of the rolling contact portion between the peripheral surfaces of the rollers,
One member of the annular roller and the member supporting each rotation shaft is in a state in which rotation around the sun roller is prevented, and the other member is coupled to the output shaft, The output shaft can be rotated and driven by a member, and
A stepped surface provided on a part of the outer peripheral surface of the input shaft and protruding from the other side surface of one of the cam plates, and contacting the other side surface of the one cam plate; A part of the outer peripheral surface of the input shaft that is screwed to a portion of the two cam plates protruding from the other side surface of the other cam plate, and that side surface is in contact with the other side surface of the other cam plate A friction roller type speed reducer comprising: a loaded loading nut; and a screwing position regulating means for regulating a screwing position of the loading nut in the axial direction with respect to the input shaft.