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A speed reducer device having a rotatably driven input shaft, a plurality of elongated planetary rollers disposed around the axis of the rotatably driven input shaft, a plurality of cylindrical output connection rings coaxial with the input shaft and within which the planetary rollers are positioned

A speed reducer device having a rotatably driven input shaft, a plurality of elongated planetary rollers disposed around the axis of the rotatably driven input shaft, a plurality of cylindrical output connection rings coaxial with the input shaft and within which the planetary rollers are positioned, and means to press the rotatably driven input shaft, the planetary rollers, and the cylindrical output connection rings together so that when the input shaft is rotated, the planetary rollers and the connection rings rotate without slipping. Each planetary roller is formed from first and second coaxial integral rollers which revolve and rotate within the space defined by the rotatably driven input shaft and the cylindrical output connection rings. The output connection rings comprise first and second output connection rings, wherein the first and second rollers rotate and revolve within the first and second output connection rings, respectively. The pressing means is adjustable to press either the first output connection ring, the first roller, and the input shaft together or the second connection ring and the second roller together, whereby the rotation of the input shaft causes the planetary rollers and either the first or second connection rings respectively to rotate.

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1. A speed reducer comprising: a rotatably driven input shaft; a plurality of elongated planetary rollers around the axis of said rotatably driven input shaft, each of said planetary rollers comprising a first roller and a second roller coaxial and integral with said first roller, said first rol

1. A speed reducer comprising: a rotatably driven input shaft; a plurality of elongated planetary rollers around the axis of said rotatably driven input shaft, each of said planetary rollers comprising a first roller and a second roller coaxial and integral with said first roller, said first roller having a larger diameter than said second roller, each planetary roller further comprising a third roller coaxial and integral with said first and second rollers, said second roller being disposed between said first and third rollers and said third roller having the same diameter as said first roller; cylindrical output connection ring means coaxial with said input shaft and within which said planetary rollers are positioned, whereby said planetary rollers rotate and revolve within a space defined by said rotatably driven input shaft and said cylindrical output connection ring means, said cylindrical output connection ring means comprising a first and a second output connection ring, wherein said planetary rollers are positioned within said output connection ring means so that said first and said second rollers rotate and revolve within said first and said second output connection rings respectively, said first and second output connection rings having gear teeth on their outer peripheries, pressing means operable to press either said first output connection ring, said first rollers, and said rotatably driven input shaft together or said second output connection ring and said second rollers together, said pressing means comprising a first output ring disposed between the outer periphery of said first rollers and the inner periphery of said first output connection ring, and a second output ring disposed between the outer periphery of said second rollers and the inner periphery of said second output connection ring, said first and second output rings being made from a synthetic resin, said pressing means further comprising first and second washer means coaxial and adjacent to the farthest apart axial ends of said first and second output rings respectively, a third washer coaxial with and disposed between said first and second output rings, metallic balls disposed between said output rings and their respective output connection rings, said balls being fixed to a recess in the output connection rings, and first and second housing members, wherein said first housing member is engagable with said first washer to press said shaft, said first rollers, said first output ring, and said first output connection rings together, while said second housing member is engagable with said second washer to press said second rollers, said second output ring, and said second output connection ring together, whereby when said input shaft is rotated, said planetary rollers, said first or second output rings, and said first or second output connection rings respectively are caused to rotate. 2. A speed reducer as set forth in claim 1, wherein said planetary rollers have tapered edges extending from the outer periphery of said first and third rollers toward said second roller and said second output ring has a tapered face which mates with the tapered edges of said planetary rollers, whereby said planetary rollers are prevented from sliding axially. 3. A speed reducer as set forth in claim 1, further comprising a pair of rotatable carriers with radially extending grooves, wherein the axial ends of each planetary roller are supported by the grooves of said carriers. 4. A speed reducer comprising: a rotatably driven input shaft; a plurality of elongated planetary rollers around the axis of said rotatably driven input shaft, each of said planetary rollers comprising a first roller and a second roller coaxial and integral with said first roller, said first roller having a larger diameter than said second roller; cylindrical output connection ring means coaxial with said input shaft and within which said planetary rollers are positioned, whereby said planetary rollers rotate and revolve within a space defined by said rotatably driven input shaft and said cylindrical output connection ring means, said cylindrical output connection ring means comprising a first and a second output connection ring, wherein said planetary rollers are positioned within said output connection ring means so that said first and said second rollers rotate and revolve within said first and said second output connection rings, respectively, said first and second output connection rings having gear teeth on their outer peripheries; a first output ring coaxial with said input shaft, said first output ring being shrink-fitted around said first rollers and positioned radially inward of said first output connection ring, whereby the first output connection ring, the first output ring, the first rollers, and the input shaft are pressed together so that when said input shaft rotates, the planetary rollers, the first output ring, and the first output connection ring are caused to rotate; a second output ring coaxial with said input shaft, said second output ring being shrink-fitted around said second rollers and positioned radially inward of said second output connection ring, whereby the second output connection ring, the second output ring, the second rollers, and the input shaft are pressed together so that when said input shaft rotates, the planetary rollers, the second output ring and the second output connection ring are caused to rotate; and a first washer coaxial with and axially adjacent to said first output ring, said first output ring being positioned between said first washer and said second output ring; a second washer coaxial with and axially adjacent to said second output ring, said second output ring being positioned between said second washer and said first output ring; a third washer coaxial with and disposed between said first and second output rings; metallic balls disposed between said output rings and their respective output connection rings, each of said balls being fixed to a recess in the output connection rings; and first and second housing members, wherein said first housing member fixedly supports said first washer in a position axially adjacent to said first output ring, while said second housing member fixedly supports said second washer in a position axially adjacent to said second output ring.