Speed reducer
AssigneeNabtesco Corporation
InventorsKoji Nakamura, Takayuki Okimura
Life of this patent
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Abstract
A gear mechanism according to the invention includes a first shaft, a second shaft disposed at an angle with the first shaft, a first gear group including a plurality of first gears that transmit rotation of the first shaft to the second shaft; and a second gear group including a plurality of second gears that transmit, to an output side, rotation of the second shaft transmitted from the first shaft. A first second gear is situated closest to the second shaft among the plurality of second gears, a last second gear is situated closest to the output side among the plurality of second gears. A straight line that connects a rotation center of the first second gear and a rotation center of the last second gear form an angle with the first shaft when viewed in a direction along the second shaft.
Claims9
A gear mechanism, comprising:
- a first shaft;
- a second shaft disposed at an angle with the first shaft;
- a first gear group including a plurality of first gears that transmit rotation of the first shaft to the second shaft;
- a second gear group including a plurality of second gears that transmit, to an output side, rotation of the second shaft transmitted from the first shaft, a first second gear being situated closest to the second shaft among the plurality of second gears, a last second gear being situated closest to the output side among the plurality of second gears, and a straight line connecting a rotation center of the first second gear and a rotation center of the last second gear, the straight line forming an angle with the first shaft when viewed in a direction along the second shaft,
- a first casing housing the first gear group;
- a second casing housing the second gear group and attached to the first casing;
- and
- an output unit casing housing an output unit that includes a third shaft serving as the output side, the output unit casing being attached to the second casing at a position adjacent the first casing, the output unit casing having a wall portion extending in a radial direction of the third shaft and a cut surface formed in the wall portion, and a thickness of the wall portion decreasing only in a portion facing the first casing to form the cut surface.
A speed reducer, comprising:
- a first shaft;
- a second shaft disposed at an angle with the first shaft;
- a first gear group including a plurality of first gears that transmit rotation of the first shaft to the second shaft;
- a second gear group including a plurality of second gears that transmit, to an output side, rotation of the second shaft transmitted from the first shaft, a first second gear being situated closest to the second shaft among the plurality of second gears, a last second gear being situated closest to the output side among the plurality of second gears, and a straight line connecting a rotation center of the first second gear and a rotation center of the last second gear, the straight line forming an angle with the first shaft when viewed in a direction along the second shaft;
- a first casing housing the first gear group;
- a second casing housing the second gear group and attached to the first casing;
- and
- an output unit casing housing an output unit that includes a third shaft serving as the output side, the output unit casing being attached to the second casing at a position adjacent the first casing, the output unit casing having a wall portion extending in a radial direction of the third shaft and a cut surface formed in the wall portion, and a thickness of the wall portion decreasing only in a portion facing the first casing to form the cut surface;
- a rotary drive source for rotationally driving the first shaft;
- and
- a speed reducing unit serving as the output side that outputs rotation of the last second gear.
Dependencies are inferred from the claim text.