초록 ▼

A one-way ratchet mechanism includes a ratchet wheel injection-molded from plastics and fastened to a hub of a flywheel, the ratchet wheel having a center axle hole, which receives a transmission shaft, a plurality of inside notches equiangularly spaced around the center axle hole, and a plurality o

A one-way ratchet mechanism includes a ratchet wheel injection-molded from plastics and fastened to a hub of a flywheel, the ratchet wheel having a center axle hole, which receives a transmission shaft, a plurality of inside notches equiangularly spaced around the center axle hole, and a plurality of trapezoidal positioning grooves respectively disposed at one end of each inside notch, a plurality of constraint plates respectively fitted into the positioning grooves and defining with the transmission shaft a respective wedge-like constraint space, a plurality of springs respectively mounted in the inside notches at one end, and a plurality of needle rollers respectively supported on the springs and moved between two ends of each wedge-like constraint space defined between the constraint plates and the transmission shaft to control one-way rotation of the ratchet wheel upon rotation of the transmission shaft.

대표청구항 ▼

1. A one-way ratchet mechanism coupled between a flywheel and a transmission shaft, said ratchet mechanism comprising:a ratchet wheel injection-molded from plastic, said ratchet wheel comprising a center axle hole which receives said transmission shaft, a plurality of inside notches equiangularly sp

1. A one-way ratchet mechanism coupled between a flywheel and a transmission shaft, said ratchet mechanism comprising:a ratchet wheel injection-molded from plastic, said ratchet wheel comprising a center axle hole which receives said transmission shaft, a plurality of inside notches equiangularly spaced around said center axle hole, and a plurality of substantially U-shaped positioning grooves respectively disposed at an end of each of said inside notches, said positioning grooves each having two opposite ends respectively extending sideways in directions away from each other and forming two retaining portions; a plurality of constraint plates each respectively mounted in an associated one of said positioning grooves, each of said constraint plates having two retaining end portions with each of the retaining end portions respectively engaged into an associated one of the retaining portions of said associated positioning groove; a plurality of springs each respectively mounted in an associated one of said inside notches at said end of the associated one of said notches; a plurality of needle rollers each having a diameter and each respectively supported on an associated one of said springs and moveable between two ends of a space defined between said associated one of said constraint plates and said transmission shaft.