SPEED REDUCTION DEVICE, DEVELOPMENT DEVICE AND IMAGE FORMING APPARATUS
First Claim
1. A speed reduction device comprising:
- an input shaft rotating by a drive force;
a fixed internal gear fixed on the input shaft;
an output internal gear rotatably disposed on the same axis as the fixed internal gear and having a different number of teeth from the fixed internal gear; and
a planetary two-stage gear supported by the input shaft so as to be rotatable around an eccentric shaft parallel to the input shaft, the planetary two-stage gear having a large diameter gear and a small diameter gear which are respectively meshed with the fixed internal gear and the output internal gear, a difference in number of teeth between the large diameter gear and the small diameter gear being equal to a difference in number of teeth between the fixed internal gear and the output internal gear,wherein when the input shaft is rotated, the outer diameter gear is meshed with the fixed internal gear, the planetary two-stage gear is revolved around the input shaft while rotating around the eccentric shaft, and the small diameter gear rotates the output internal gear.
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Abstract
A speed reduction device includes an input shaft, a fixed internal gear, an output internal gear and a planetary two-stage gear. The fixed internal gear is fixed on the input shaft. The output internal gear is rotatably disposed on the same axis as the fixed internal gear and has a different number of teeth from the fixed internal gear. The planetary two-stage gear is supported by the input shaft so as to be rotatable around an eccentric shaft. The planetary two-stage gear has a large diameter gear and a small diameter gear which are respectively meshed with the fixed internal gear and the output internal gear. A difference in number of teeth between the large diameter gear and the small diameter gear is equal to a difference in number of teeth between the fixed internal gear and the output internal gear.
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Citations
6 Claims
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1. A speed reduction device comprising:
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an input shaft rotating by a drive force; a fixed internal gear fixed on the input shaft; an output internal gear rotatably disposed on the same axis as the fixed internal gear and having a different number of teeth from the fixed internal gear; and a planetary two-stage gear supported by the input shaft so as to be rotatable around an eccentric shaft parallel to the input shaft, the planetary two-stage gear having a large diameter gear and a small diameter gear which are respectively meshed with the fixed internal gear and the output internal gear, a difference in number of teeth between the large diameter gear and the small diameter gear being equal to a difference in number of teeth between the fixed internal gear and the output internal gear, wherein when the input shaft is rotated, the outer diameter gear is meshed with the fixed internal gear, the planetary two-stage gear is revolved around the input shaft while rotating around the eccentric shaft, and the small diameter gear rotates the output internal gear. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification