The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 20, 1990
Filed:
May. 12, 1988
Takashi Haga, Obu, JP;
Sumitomo Heavy Industries, Ltd., Tokyo, JP;
Abstract
A planetary gear system comprises a plurality of external gears swingably rotated by at least three eccentric members juxtaposed axially with their phases offset from each other; an internal gear internally meshing with these external gears; and a flange for retaining pins fitted with a play in internal pin holes formed in the external gears. This planetary gear system is used as a planetary reduction gear when the eccentric members are rotatively driven with either one of the internal gear or the flange being held stationary, so as to obtain an output of reduced rotation, or as a planetary overdrive gear in which either one of the internal gear or the flange is held stationary, and an input is applied to the other to obtain an output of accelerated rotation from a shaft on which the eccentric members are installed. All the eccentric members are formed integrally as one component. Since the eccentric members are formed integrally, there is no possibility of the phase difference among the eccentric members becoming out of the phase as in the case where the eccentric members are formed separately. Consequently, the component members can be assembled with a high degree of accuracy, and a situation can be eliminated in which the external gears and the internal gear fail to engage smoothly due to any disorder in the phases of the eccentric members during operation. Further, since the eccentric members are formed integrally, although it becomes difficult to install rollers having inner peripheral rings as well as the external gear around the eccentric member in an intermediate portion, a measure for overcoming this problem is provided.