Back to results
US 2001/0044356 A1Published application
Eccentric orbiting type speed reducer and joint for industrial machine equipped with the same
AssigneeTeijin Seiki Co., Ltd.
InventorsKenichi Takeuchi, Jun Hirose
Life of this patent
Estimating the term…
Abstract
An eccentric orbiting type speed reducer for the joint of the industrial machine has a plurality of crankshafts, a rotational driving force being input into one crankshaft alone among the plurality of crankshafts, in which the bearing capacity for one crankshaft among the plurality of crankshafts is greater than the bearing capacities for other crankshafts.
Claims4
An eccentric orbiting type speed reducer comprising:
- an internal tooth member having the internal teeth formed on the inner circumference;
- a first rotational member with a plurality of circular grooves formed inside that is carried rotatably by said internal tooth member, while keeping a coaxial relation with said internal tooth member;
- a second rotational member with a plurality of circular grooves formed inside, said plurality of circular grooves being opposed respectively to said plurality of circular grooves for said first rotational member, said second rotational member being carried rotatably by said internal tooth member, while keeping a coaxial relation with said internal tooth member;
- an external gear having the external teeth formed on the outer circumference, with a plurality of through holes formed inside, said external teeth meshing with said internal teeth of said internal tooth member, said external gear being carried between said first rotational member and said second rotational member;
- a plurality of crankshafts having the first insertion portions to be inserted respectively into said plurality of pairs of opposed circular grooves for said first rotational member and said second rotational member, and the second insertion portions to be inserted respectively into said plurality of through holes for said external gear and orbiting eccentrically said external gear;
- a plurality of pairs of first bearings for holding said first insertion portions of said crankshafts rotatably with respect to said first rotational member and said second rotational member, respectively;
- and
- a plurality of second bearings for holding said second insertion portions of said crankshafts rotatably with respect to said external gear;
- wherein the basic radial load rating of said first bearing into which said first insertion portion of one of said plurality of crankshafts is inserted is greater than the basic radial load ratings of said first bearings into which said first insertion portions of the remaining crankshafts among said plurality of crankshafts are inserted.
6 more elements
An eccentric orbiting type speed reducer comprising:
- an internal tooth member having the internal teeth formed on the inner circumference;
- a first rotational member with a plurality of circular grooves formed inside that is carried rotatably by said internal tooth member, while keeping a coaxial relation with said internal tooth member;
- a second rotational member with a plurality of circular grooves formed inside, said plurality of circular grooves being opposed respectively to said plurality of circular grooves for said first rotational member, said second rotational member being carried rotatably by said internal tooth member, while keeping a coaxial relation with said internal tooth member;
- an external gear having the external teeth formed on the outer circumference, with a plurality of through holes formed inside, said external teeth meshing with said internal teeth of said internal tooth member, said external gear being carried between said first rotational member and said second rotational member;
- a plurality of crankshafts having the first insertion portions to be inserted respectively into said plurality of pair of opposed circular grooves for said first rotational member and said second rotational member, and the second insertion portions to be inserted respectively into said plurality of through holes for said external gear and orbiting eccentrically said external gear;
- a plurality of pairs of first bearings for holding said first insertion portions of said crankshafts rotatably with respect to said first rotational member and said second rotational member;
- and
- a plurality of second bearings for holding said second insertion portions of said crankshafts rotatably with respect to said external gear;
- wherein the basic radial load rating of said second bearing into which said second insertion portion of one of said plurality of crankshafts is inserted is greater than the basic radial load ratings of the rolling elements of said second bearings into which said second insertion portions of the remaining crankshafts among said plurality of crankshafts are inserted.
6 more elements
A joint for an industrial machine comprising an eccentric orbiting type speed reducer for eccentrically orbiting an external tooth member with respect to an internal tooth member, and a motor having an output shaft for outputting a rotational driving force;
- wherein said eccentric orbiting type speed reducer comprises:
- said internal tooth member having the internal teeth formed on the inner circumference;
- a first rotational member with a plurality of circular grooves formed inside that is carried rotatably by said internal tooth member, while keeping a coaxial relation with said internal tooth member;
- said second rotational member with a plurality of circular grooves formed inside, said plurality of circular grooves being opposed to said plurality of circular grooves for said first rotational member, said second rotational member being carried rotatably by said internal tooth member, while keeping a coaxial relation with said internal tooth member;
- an external gear having the external teeth formed on the outer circumference, with a plurality of through holes formed inside, said external teeth meshing with said internal teeth of said internal tooth member, said external gear being carried between said first rotational member and said second rotational member;
- a plurality of crankshafts having the first insertion portions to be inserted respectively into said plurality of pair of opposed circular grooves for said first rotational member and said second rotational member, and the second insertion portions to be inserted respectively into said plurality of through holes for said external gear;
- a plurality of pairs of first bearings for holding said first insertion portions of said crankshafts rotatably with respect to said first rotational member and said second rotational member, said first bearings being inserted into said plurality of pairs of opposed circular grooves for said first rotational member and said second rotational member;
- and
- a plurality of second bearings for holding said second insertion portions of said crankshafts rotatably with respect to said external gear, said second bearings being inserted into said plurality of through holes for said external gear;
- wherein the rotational driving force output from said output shaft is input into said crankshaft in which the basic radial load rating of said first bearing and/or second bearing is greater than those of said other crankshafts.
7 more elements
In an eccentric orbiting type speed reducer for a joint of an industrial machine having a plurality of crankshafts, a rotational driving force is input into one crankshaft alone among the plurality of crankshafts, and bearing capacity for one crankshaft among the plurality of crankshafts is greater than bearing capacities for other crankshafts.
Dependencies are inferred from the claim text.