Gear device
AssigneeIM Co., Ltd.
InventorToshiaki Shimada
Life of this patent
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Abstract
First input-side eccentric part 39a of an input shaft 39 is inserted into a central hole of an external gear 47. A crank pin 60 for controlling the motion of the external gear 47 has a first crank-side eccentric part 60d whose eccentricity is equal to that of the first input-side eccentric part 39a. The first crank-side eccentric part 60d is engaged with the external gear 47. The input shaft 39 has a second input-side eccentric part 39b whose eccentricity is larger than that of the first input-side eccentric part 39a. The second input-side eccentric part 39b is provided with a driving member 49 such that the driving member 49 is rotatable. The crank pin 60 has a second crank-side eccentric part 60c whose eccentricity is equal to that of the rear eccentric part 39b. The second crank-side eccentric part 60c is engaged with the driving plate 67.
Claims4
An eccentrically-orbital gear device, comprising:
- an internal gear;
- an external gear placed inside the internal gear;
- an input shaft having a first input-side eccentric part which is inserted in a central hole formed in the external gear such that the first input-side eccentric part is rotatable around its center line;
- and a crankshaft rotatably supported by a device main body, the crankshaft having a first crank-side eccentric part which is engageable with the external gear with an eccentricity equal to that of the first input-side eccentric part, the external gear producing eccentrically-orbital motion while being meshed with the internal gear and being inhibited by the crankshaft from rotating, wherein
- the input shaft has a second input-side eccentric part whose eccentricity is larger than that of the first input-side eccentric part,
- the second input-side eccentric part is provided with a driving member for driving the crankshaft such that the driving member is rotatable around a center line of the second input-side eccentric part, and
- the crankshaft has a second crank-side eccentric part which has an eccentricity equal to that of the second input-side eccentric part and which is engageable with the driving member.
Dependencies are inferred from the claim text.