Friction type transmission device and pressing force control method for friction type transmission device
AssigneeNissan Motor Co., Ltd.
InventorTakeshi Yamamoto
Life of this patent
Estimating the term…
Abstract
In a friction drive transmission apparatus arranged to transmit power by a frictional transmission force between two roller units pressed against each other, there is provided a pressing force imparting means to increase and decrease a pressing force imparted to a roller pair to vary the frictional transmission force between both roller units smoothly at the time of a shift.
Claims15
A friction drive transmission apparatus comprising:
- driving roller unit and driven roller unit which are supported rotatably, the driving and driven roller units being pressed in press contact to each other and arranged to transmit a power from one of the driving and driven roller units to the other by a frictional transmission force produced in a contact portion therebetween, the driving and driven roller units being constructed by a plurality of roller pairs having different roller radii, at least one of the driving and driven roller units being supported rotatably on an eccentric shaft so that an inter-axis distance of each roller pair is varied by rotation of the eccentric shaft, and the power is transmitted selectively by one of the roller pairs;
- and
- a pressing force imparting means to vary a pressing force imparted to the roller pairs to vary the frictional transmission force smoothly at the time of a shift.
A control method of controlling a pressing force of a friction drive transmission apparatus comprising driving roller unit and driven roller unit which are supported rotatably, the driving and driven roller units being pressed in press contact to each other and arranged to transmit a power from one of the driving and driven roller units to the other by a frictional transmission force produced in a contact portion therebetween, the driving and driven roller units being constructed by a plurality of roller pairs having different roller radii, at least one of the driving and driven roller units being supported rotatably on an eccentric shaft so that an inter-axis distance of each roller pair is varied by rotation of the eccentric shaft, and the power is transmitted selectively by one of the roller pairs, the control method comprising a step of varying the pressing force imparted to the roller pair, to vary the frictional transmission force at the time of a shift smoothly.
A friction drive transmission apparatus comprising:
- a first roller unit including a plurality of rollers having different outside diameters;
- a second roller unit including a plurality of rollers having different outside diameters, the rollers of the second roller unit being, respectively, paired with the rollers of the first roller unit to form roller pairs;
- an eccentric shaft rotatably supporting at least one of the first roller unit and the second roller unit, the eccentric shaft being arranged to select one of the roller pairs by rotating and to transmit a power by setting a selected roller pair in friction contact;
- a cam member including a cam slope surface abutting on a rotation support portion of the first roller unit;
- and
- a damping force producing means arranged to produce a damping force in a direction of the cam slope surface to the first roller unit.
Dependencies are inferred from the claim text.