Patent WO-2011081257-A1 (WO)
Title: Bicycle acceleration apparatus for increasing speed
Inventor: SEO DAL WON
IPC: B62M11/16
Filed: 2010-04-13
Abstract: The present invention relates to a bicycle acceleration apparatus for increasing speed, comprising: a main hub housing (12) having a hole completely opening one side thereof defined therein, and in which a coupler (2) is inserted in the center at the other side thereof, including a projecting part (12b) outwardly formed from the hole to guide the coupler (2), and a projecting part (12c) inwardly formed into the hole so as to couple to a hub bushing (102); said hub bushing (102) coupled and fixed to the projecting part (12c) of the main hub housing (12), and having a sun gear (101) concentrically and integrally formed on an outer periphery thereof; a ball guide bushing (113) coupled to the hub bushing (102) so as to be capable of rolling against the latter, and having a gear cover (106) fastened at an outer periphery thereof; said gear cover (106) fastened to the ball guide bushing (113), including a latch (114) on an outer periphery thereof for inducing unidirectional rotation, and a latch spring (115) for supporting the latch (114), and including a plurality of planetary gears (103) meshing with the sun gear (101) at one side thereof, for driving the sun gear at the side of the hub bushing by means of the planetary gears, and raising the rotating speed thereof; a gear housing (108) installed within the main hub housing (12) to define a gear-type coupling ledge (108a) passing through the inner circumference of the main hub housing (12), and including a ring gear (107), the inner circumference of which meshes with the planetary gears (103) so as to enable the gear cover (106) including the planetary gears (103) to rotate; a locker (109) fastened to the coupler (2) provided in-line with the main hub housing (12), and including a coupling projection part (109a) guided on and coupled, at a periphery thereof, to the coupling ledge (108a) of the gear housing (108), and an inserting ledge part (109c) guided together with a bushing ring (116) provided within the inner periphery of the hub bushing (102) on which the sun gear (101) is formed; an auxiliary hub housing (111) inserted in the main hub housing (12) through the open portion at one side of the main hub housing (12), having a hole completely opening an insertion side thereof, which is defined in a center of an outer side thereof and from which a projecting part (111d) outwardly projects, including a screw thread (111e) formed on the projecting part (111d) for coupling a chain gear (S2) thereon, having a hollow cylindrical shape including a stepped part (111a) for receiving the outer circumference of the gear housing (108), and defining a female screw thread (111c) on an inner periphery thereof; and an auxiliary hub housing cover (110) defining a male screw part (110a) in the outer periphery thereof to couple to the female screw thread (111c) of the auxiliary hub housing (111), and including a gear latch part (110b) on an inner periphery thereof, wherein the gear latch part contacts the latch (114) of the gear cover (106) for unidirectional rotation. When the acceleration apparatus is installed on a hub shaft and a bicycle is ridden using the acceleration apparatus on the bicycle, the rotational force can be increased two-fold or more, the apparatus is made compatible with a chain gear, is protected from external impacts, can prevent snagging, and can also have various types of gear devices externally installed thereon.