Structure of one-way bearing
A one-way bearing is arranged between an input member and an output member and includes a plastic mounting base, a plurality of rollers, and a metallic transmission base. The plastic mounting base is molded to form a plurality of equidistant and radially-penetrating mounting recesses, and the rollers are respectively received in the mounting recesses. A circumferential surface of the metallic transmission base that corresponds to the plastic mounting base is formed with a plurality of transmission slopes respectively corresponding to the mounting recesses, so that the rollers arranged in the plastic mounting base may selectively clamp the metallic transmission base by means of the transmission slope to induce an effect of one-way driving. In this way, the molded plastic mounting base may help reduce the weight of the one-way bearing without affecting the strength for power transmission, achieving advantages of light weight, cost reduction, and easy machinability.
1 . A structure of a one-way bearing, which is applicable between an input member and an output member to allow the input member to selectively drive the output member to move, in a one-way manner, toward a driving side, the one-way bearing comprising:
a plastic mounting base, which is made through molding a plastic material, the plastic mounting base comprising a plurality of equidistant and radially-penetrating mounting recesses, wherein the mounting recesses each receive therein a roller, and the mounting recesses are each provided with an elastic element at one side of the respective roller that is opposite to a driving side, wherein each of the mounting recesses of the plastic mounting base has two opposite inside surfaces and one inside surface of the two opposite inside surfaces of each of the mounting recesses of the plastic mounting base that corresponds to a non-clamping-operation side of the respective roller is formed with a stepped notch recessed in an axial direction to receive the elastic element therein, the input member being arranged at one side of the plastic mounting base, the input member being settable in contact engagement with and driving the rollers in the plastic mounting base, wherein one side of the two opposite inside surfaces of the mounting recesses of the plastic mounting base that corresponds to the metallic transmission base is formed with a first retention curved surface; and
a metallic transmission base, which is made of a metal material possessing resistance, the metallic transmission base being arranged at one side of the plastic mounting base that is opposite to the input member, a surface of the metallic transmission base that corresponds to the plastic mounting base being formed, along a circumference thereof, with a plurality of transmission slopes respectively corresponding to the mounting recesses, the transmission slope having two ends, of which one end that is opposite to the driving side is formed with a deep trough portion and one end that corresponds to the driving side is formed with a shallow trough portion, wherein a second retention curved surface is formed between the shallow trough portion and the deep trough portion of adjacent ones of the transmission slopes of the metallic transmission base to correspond to the first retention curved surface of the plastic mounting base for combining and positioning the metallic transmission base and the plastic mounting base.
2 . The structure of the one-way bearing according to claim 1 , wherein the metallic transmission base is arranged on an outer circumference of the plastic mounting base and the input member is arranged on an inner circumference of the plastic mounting base, and the output member is arranged on an outer circumference of the metallic transmission base.
3 . The structure of the one-way bearing according to claim 1 , wherein each of the two opposite inside surfaces of each of the mounting recesses of the plastic mounting base is formed with a concave arc surface corresponding to a circumference of the respective roller to increase an operation space for the roller.
4 . The structure of the one-way bearing according to claim 1 , wherein a circumference of the metallic transmission base that corresponds to the output member is formed with at least one first retaining engagement surface, and a corresponding circumference of the output member is formed with a second retaining engagement surface corresponding to the first retaining engagement surface in order to increase an arear of resistance between the metallic transmission base and the output member.