Speed reduction apparatus for off-centering swing

Abstract

An eccentric swing speed reducer ensures the primary reduction ratio greatly and is arranged in short along the axial direction. The speed reducer includes: a sun wheel (center rotor) (116); a transmission gear (eccentric shaft driver) (118) rotating through the sun wheel; an eccentric body (120) rotating with the transmission gear integrally; an external gear (swing body) (124A, 124B) swinging and rotating through the eccentric body shaft; first, second brackets (bracket bodies) (132, 134) synchronizing with the autorotation component of the external gear; and a septa (125) configured on the axial position same as the transmission gear for limiting the axial motion of the external gear. An internal gear (128) is configured, so that the first, second pins (128P1, 128P2) are at the internal circumference side, a gap (128S) is in the axial direction, and a septa is configured in the gap.

Description

technical field [0001] The invention relates to an eccentric swing speed reducer. Background technique [0002] An eccentric oscillating reduction gear is known, which has: a central rotating body; an eccentric shaft driving body that rotates through the central rotating body; an eccentric shaft that rotates integrally with the eccentric shaft driving body; at least two oscillating bodies, Arranged on both sides in the axial direction of the eccentric shaft driving body, and oscillatingly rotated by the eccentric shaft; and an internal gear to which the oscillating bodies are respectively inscribed (for example, refer to Patent Document 1). [0003] And, the same applicant proposed the structure which improved the structure of this patent document 1. [0004] Figure 4 , Figure 5 It means the improved eccentric swing speed reducer. [0005] In this eccentric oscillating reduction gear 12 , a sun gear (center rotor) 16 is formed on an input shaft 14 . The sun gear 16 mes...

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Problems solved by technology

[0012] However, in the eccentric oscillating reduction gear having such a structure, for example, when the transmission gear 18 is arranged between the external gears 24A and 24B as in the structure of the embodiment described later for the purpose of shortening the axial direction, there is a problem that The outer periphery of this transmission gear 18 interferes with the inner periphery of spacer 25, the size of transmission gear 18 cannot be made too large

Therefore, in the case of obtaining a reduction ratio of more than a certain degree in the primary reduction part (the sun gear 16 and the transmission gear 18), as already explained Figure 4 , Figure 5 As in the case of the above structure, there is a problem that the transmission gear 18 has to be arranged at a position where it does not interfere with the spacer 25 (in the illustrated example, the axial outer side of the external gear 24A), and the axial length of the overall reduction gear becomes larger. long

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