Reduction gear

A speed-change gear, comprising:

• a housing;
• a first annular internal gear fixed in said housing;
• a first pinion disposed in said housing concentrically with said first internal gear;
• a first shaft provided integrally with said first pinion and rotatably supported in said housing;
• a plurality of first planet gears geared with said first pinion and said first internal gear;
• a second shaft rotatably supported in said housing, said planet gears being supported by said second shaft with at least one circumferential inter-axes interval therebetween, wherein said second shaft has at least two support portions respectively supporting said first planet gears wherein said support portions are integral with each other and bendable in a circumferential direction with respect to each other;
• and
• first means for changing a size of said inter-axes interval of said first planet gears by circumferentially moving and thereby bending said support portions with respect to each other.

A speed-change gear, comprising;

• a housing;
• a first annular internal gear fixed in said housing;
• a first pinion disposed in said housing concentrically with said first internal gear;
• a first shaft provided integrally with said first pinion and rotatably supported in said housing;
• a plurality of first planet gears mounted on respective first planet gear shafts and geared with said first pinion and said first internal gear;
• a second shaft rotatably supported in said housing, said first planet gear shafts being supported by said second shaft with at least one inter-axes interval therebetween along a circumferential direction of said first pinion, wherein said second shaft has at least two support portions respectively supporting said first planet gear shafts and being circumferentially movable with respect to each other;
• and
• first means for changing and stationarily fixing a size of said inter-axes interval of said first planet gear shafts;
• wherein said second shaft has at least two support portions, respectively supporting said first planet gear shafts and being circumferentially movable with respect to each other;
• and
• wherein said first changing means includes means for circumferentially moving said support portions with respect to each other and includes a screw threaded in one of said support portions and having an axial end contactable with another of said support portions.

A speed-change gear, comprising;

• a housing;
• a first annular internal gear fixed in said housing;
• a first pinion disposed in said housing concentrically with said first internal gear;
• a first shaft provided integrally with said first pinion and rotatably supported in said housing;
• a plurality of first planet gears mounted on respective first planet gear shafts and geared with said first pinion and said first internal gear;
• a second shaft rotatably supported in said housing, said first planet gear shafts being supported by said second shaft with at least one inter-axes interval therebetween along a circumferential direction of said first pinion, wherein said second shaft has at least two support portions respectively supporting said first planet gear shafts and being circumferentially movable with respect to each other and wherein said support portions are integral with each other and bendable in a circumferential direction with respect to each other;
• and
• first means for changing and stationarily fixing a size of said inter-axes interval of said first planet gear shafts.