Patent ID: 6368243
Filing Date: 2002-04-09
Classification: B62M,Y10T

Abstract:
A bike inner derailleur comprising a wheel hub, a power input driving means, a speed change driving means, a fix shaft, a flat projecting wheel, a first planetary gear group, a first internal gear, a second planetary gear group, a second internal gear, an intermediate ring as main components; said wheel hub having a hollow central interior for said fix shaft to position therein longitudinally, said wheel hub rotatable with said fix shaft as a pivot, two pairs of two sun gears fitted around said fix shaft, said first planetary gear group located around an outer periphery of a first pair of said sun gears, said second planetary gear group located around an outer periphery of a second pair of said sun gears, said first planetary gears group engaging said first pair of said sun gears, said second planetary gear group engaging said second pair of said sun gears, each said planetary gear group located in and engaging said first and said second internal gear, said intermediate ring located between said first planetary gear group with said first internal gear and said second planetary gear group;said power input driving means and said speed change driving means located at one side of said wheel hub, an output end of said power input driving means facing an input end of said first planetary gear group and an input end of said first internal gear, said power input driving means having a first detent on an outer edge of its output end to engage an engage section of said input end of said first internal gear, said power input driving means having an engage section on an inner edge of its output end to engage a second detent of an input end of a first planetary gear frame, said second detent controlled by a first sleeve fitted on said fix shaft and moving horizontally, said second detent moved to become OFF, wherein said second detent separates from said engage section of said power input driving means when said first sleeve moves horizontally, movement of said first sleeve carried out by a first control rod, an end of said first control rod closely contacting on a first annular groove of plural annular grooves of the same center of said flat projecting wheel, said end of said first control rod pulled by a first spring to closely contact and move horizontally along said first annular groove having a surface of mixed high and low sections, said speed change driving means of a speed change operating system rotatable to rotate said flat projecting wheel to change a rotating angle; said first internal gear having annular inner teeth engaging a low stage teeth surface of said first planetary gear group and an output end facing an outer edge of an input end of said intermediate ring, a fifth detent controlling relation between said first internal gear and said intermediate ring; planetary gears of said first planetary gear group having a high and a low stage of teeth surface respectively engaging the first pair of said sun gears, a small one of said first pair of said sun gears controlled by a third detent, a large one of said first pair of said sun gears controlled by a fourth detent, said third and said fourth detent oriented to have the same clockwise direction; said gear frame of said first planetary gear group having an engage section on an outer edge of an output end facing a sixth detent on an inner edge said input end of said intermediate ring; said outer edge of said input end of said intermediate ring having a fifth detent facing said output end of said first internal gear, said fifth detent moved by a third sleeve which is then moved by a third control rod moving horizontally, said third control rod having one end connected to said third sleeve and the other end pulled by a third spring to closely contact and move horizontally on a surface of mixed high and low sections of a third annular groove of said plural annular grooves on said flat projecting wheel; said outer edge of said input end of said intermediate ring having a first combine groove for said fifth detent, said fifth detent becoming ON or OFF by control of said third sleeve at said output end of said first internal gear, said intermediate ring having a second combine groove for said sixth detent to let said sixth detent engage and move with said engage section of said output end of said first planetary gear frame owing to said fifth detent being OFF; an outer edge of an output end of said intermediate ring having a third combine groove to engage and move together with a seventh detent of an engage section formed on an input end of said second internal gear and an inner edge of an output end thereof having an engage section to engage and move together with an eighth detent of an input end of said second planetary gear frame; said second planetary gear group having planetary gears provided with a high and a low stage of teeth surface to respectively engaging the second pair of said sun gears, a small one of said second pair of said sun gears controlled by a ninth detent and a large one thereof by a tenth detent, said ninth and said tenth detent oriented to have the same clockwise direction, said ninth detent controlled by angle movement of a fourth sleeve, said ninth sleeve rotated by a fourth control rod moving horizontally, said fourth control rod having an end pulled by a fourth spring to closely contact and move horizontally on a mixed high and low surface of a fourth annular groove of said flat projecting wheel; said planetary gear frame of said second planetary gear group having an engage section formed on an output end to face a twelfth detent of a power output means, an output end of said power output means engaging an inner wall of said wheel hub.