Patent WO-2013042825-A1 (WO)
Inventor: SEO DAL WON
IPC: F16H3/44
Filed: 2011-12-01
Abstract: The present invention relates to a bicycle accelerating device, and more particularly, to a bicycle accelerating device that is installed on a hub shaft of a bicycle driven by a chain, and prevents an overload on a chain or a shock imparted to the chain due to a sudden reversal even when the pedals are rotated in the reverse direction during riding and the driven direction of the chain is rotated in reverse, and enables a soft and smooth reversal. The present invention relates to a bicycle accelerating device for increasing travelling speed, comprising: an accelerating device (100) including a hub bushing (102); a gear cover (110); a gear housing (108); a rocker (109); and a transmission body (111). The gear cover (110) consists of: a planetary gear carrier (210) installed so that a sun gear (101) and a planetary gear (103) can rotate; and a gearshift cover (230) receiving a gear housing (108) in which the sun gear (101) and the planetary gear (103) are inserted, and coupled to the outside of the transmission body (111) including chain gears (S2 to S7) having mutually different diameters and installed in steps on the outside thereof. The planetary gear carrier (210) is formed as a hollow ring, and comprises: a planetary gear rotation shaft (213), on which the planetary gear (103) is rotatably installed, formed on one side thereof, and bearing insert recesses (210a) formed in the other side thereof in which bearing balls (112) formed as a plurality of round spheres are seated therein; 3 to 4 recessed latch insert grooves (215) and a latch spring insert recess (214) having a cross-sectional "ㄷ" shape formed toward the outside on the outer periphery thereof; and a latch (211) having a latch spring fixing groove (212) at the center thereof inserted in the latch insert groove (215). An annular latch spring (220) having resilience and fixing the latch (211) to the outside of the planetary gear carrier (210) is formed inserted in connection with the latch spring insert groove (214) formed on the outer periphery of the planetary gear carrier (210) and on the latch spring fixing groove (212) provided at the center of the latch (211), the gearshift cover (230) is formed in a cap shape and has a bearing insert groove (232) formed therein and having a bearing (B) inserted an inner center thereof, a planetary gear carrier insert groove (233) having the planetary gear carrier (210) inserted therein is formed in the outside of the bearing insert groove (232), a bearing ball insert groove (230a), in which a plurality of spherical bearing balls (112) arranged in a circle is seated, is formed between the bearing insert groove (232) and the planetary gear carrier insert groove (233), a wedge-shaped latch catching piece (231) is formed to connect and catch on the overall inner periphery of the gearshift cover (230) in the form of a saw-tooth wheel shape, and the planetary gear carrier (210) having the sun gear (101) and the planetary gear (103) rotatably installed thereon is formed inserted into the gearshift cover (230) which houses the gear housing (108) and is coupled to the outside of the transmission body (111) having the chain gears (S2 to S7) of mutually different diameters installed in steps on the outside thereof.