Multi-ratio transmission system with parallel vertical and coaxial planet gears

A multi-ratio transmission system with parallel vertical and coaxial planet gears, comprising:

• a plurality of planet gear sub-systems, being coaxially disposed in series along a first axis, each of said planet gear sub-system comprising:
• a sun gear, being coaxially disposed along said first axis, wherein said sun gear rotates around said first axis;
• and
• at least one planet gear, being coaxially disposed along a second axis which is vertical to said first axis, wherein said at least one planet gear rotates around said second axis;
• at least two coupling assemblies, wherein each of said coupling assembly includes a gear set, and is disposed between every two adjacent said planet gear sub-systems so as to transmit rotation of said planet gear of the former said planet gear sub-system to said planet gear of the latter said planet gear sub-system;
• wherein said at least two coupling assemblies form a group of said coupling assemblies, and groups of coupling assemblies are disposed along said first axis in a repeated manner;
• a setting element disposed corresponding to each of said planet gear sub-systems, wherein said setting element moves in the direction of said first axis so as to engage with said sun gear of said planet gear sub-system;
• a setting element controller, having a hollowed tube disposed coaxially with said first axis to rotate around said first axis within a range of predetermined angles, wherein said hollowed tube has an outer circumferential surface, and a cam groove is formed on said outer circumferential surface in the circumferential direction corresponding to each of said setting element of said planet gear sub-system, thereby allowing said setting element to move along said first axis and to engage with said sun gears of said planet gear sub-systems;
• an annular gear installed onto to a one-way clutch, wherein said annular gear forms a linkage relationship with said planet gear of at least one said planet gear sub-system;
• a cylindrical casing enclosing said planet gear sub-systems, wherein said cylindrical casing has a front end for rotatably fitting said annular gear;
• a sprocket installed onto said one-way clutch, wherein said sprocket is installed with an external transmission system to drive said planet gear sub-systems to rotate via said one-way clutch and said annular gear;
• and
• a central axle, being disposed coaxially with said first axis, wherein said central axle is inserted into a center through hole of said hollowed tube of said setting element controller by relative rotation, thereby enabling said hollowed tube to rotate around said central axle.