US2022186816A1PendingUtilityA1
Nutational cycloidal reducer
Est. expiryDec 14, 2040(~14.4 yrs left)· nominal 20-yr term from priority
Inventors:Bruce A. Billmeyer
F16H 1/321F16H 55/08F16H 13/08F16H 55/17F16H 1/32F16H 2001/325F16H 2001/323F16H 2001/327
44
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Claims
Abstract
A nutational cycloidal reducer reduces an input speed to an output speed by a reduction ratio. The reducer includes a timing ring having an internal wall with a series of longitudinally extending tooth profiles, an output connected to the timing ring, a pulley having a central opening, a series of longitudinally extending tooth profiles and a plurality of circumferentially disposed pin bores. An input shaft has first and second shaft portions. The first portion is concentric with a longitudinal axis and the second portion is eccentric to the axis. A plate has a central opening. The pulley is positioned in the timing ring with some of the pulley and timing ring tooth profiles engaged with each other. The second shaft portion is positioned in the pulley and the plate and drives the pulley in a nutational movement. The pulley has one or more less tooth profiles than the timing ring, such that the reduction ratio is defined by # of timing ring tooth profiles/(# of timing ring tooth profiles−# of pulley tooth profiles).
Claims
exact text as granted — not AI-modified1 - 20 . (canceled)
21 . A nutational cycloidal reducer for reducing an input rotational speed to an output rotational speed by a reduction ratio, the reducer comprising:
a timing ring having a circular cross-section defining an axis, the timing ring having an internal wall having a series of tooth profiles; an output operably connected to the timing ring; a pulley having a body having a central opening, a series of tooth profiles and a plurality of circumferentially disposed pin bores formed in the body; an input shaft having a concentric shaft portion, and an eccentric shaft portion; a pin plate having a body having a central opening and a plurality of pins extending from a side thereof, wherein the pulley is positioned in the timing ring with some of the plurality of pulley tooth profiles engaged with some of the plurality of timing ring tooth profiles, wherein the eccentric shaft portion is positioned in the pulley central opening, wherein the pin plate is positioned with the pins positioned in the pulley pin bores and the input shaft extending through the pulley central opening, wherein the input shaft drives the pulley nutationally in the timing ring, engaging some of the plurality of pulley tooth profiles with some of the plurality of timing ring tooth profiles, which drives the timing ring and output concentrically, and wherein the pulley has one or more less tooth profiles than the timing ring, and wherein the reduction ratio is defined by
#
of
timing
ring
tooth
profiles
(
#
of
timing
ring
tooth
profiles
-
#
of
pulley
tooth
profiles
)
.
22 . The reducer of claim 21 , wherein the output is a shaft.
23 . The reducer of claim 22 , wherein the shaft is formed integral with the timing ring.
24 . The reducer of claim 21 , wherein the input shaft eccentric portion is formed as an overmold over the input shaft concentric portion.
25 . The reducer of claim 21 , wherein the pulley includes 8 pin bores and wherein the pin plate includes 8 pins.
26 . The reducer of claim 21 , further including a housing, wherein the timing ring, pulley and pin plate are positioned in the housing.
27 . The reducer of claim 26 , further including end caps on the housing.
28 . The reducer of claim 27 , further including a bearing positioned on the output at about one of the end caps.
29 . The reducer of claim 21 wherein the timing ring includes 30 tooth profiles and the pulley includes 29 tooth profiles, and wherein the reducer has a 30:1 reduction ratio.
30 . The reducer of claim 21 wherein the timing ring includes 30 tooth profiles and the pulley includes 28 tooth profiles, and wherein the reducer has a 15:1 reduction ratio.
31 . The reducer of claim 21 wherein the timing ring includes 30 tooth profiles and the pulley includes 27 tooth profiles, and wherein the reducer has a 10:1 reduction ratio.
32 . A nutational cycloidal reducer, comprising:
a timing ring having a circular cross-section defining an axis, the timing ring having an internal wall having a series of tooth profiles; an output operably connected to the timing ring; a pulley having a body having a central opening and a series of tooth profiles; an input shaft having a concentric shaft portion, an eccentric shaft portion; a limiting member, wherein the pulley is positioned in the timing ring with some of the plurality of pulley tooth profiles engaged with some of the plurality of timing ring tooth profiles, wherein the eccentric shaft portion is positioned in the pulley central opening, wherein the input shaft rotates driving the pulley in a nutational movement, engaging some of the plurality of pulley tooth profiles with some of the plurality of timing ring tooth profiles, which drives the timing ring and output concentrically, wherein the pulley has one or more less tooth profiles than the timing ring, and wherein a reduction ratio is defined by
#
of
timing
ring
tooth
profiles
(
#
of
timing
ring
tooth
profiles
-
#
of
pulley
tooth
profiles
)
,
and
wherein the limiting member limits movement of the pulley to a nutational movement.
33 . The reducer of claim 32 wherein the timing ring includes 30 tooth profiles and the pulley includes 29 tooth profiles, and wherein the reducer has a 30:1 reduction ratio.
34 . The reducer of claim 32 wherein the timing ring includes 30 tooth profiles and the pulley includes 28 tooth profiles, and wherein the reducer has a 15:1 reduction ratio.
35 . The reducer of claim 32 wherein the timing ring includes 30 tooth profiles and the pulley includes 27 tooth profiles, and wherein the reducer has a 10:1 reduction ratio.
36 . The reducer of claim 32 , further including a housing, wherein the timing ring, pulley and pin plate are positioned in the housing.
37 . The reducer of claim 36 , further including end caps on the housing.
38 . The reducer of claim 37 , further including a bearing positioned on the output at about one of the end caps.
39 . The reducer of claim 38 , wherein one or more of the timing ring, the pulley and the drive plate are formed from polymeric materials.
40 . The reducer of claim 21 , wherein one or more of the timing ring, the pulley and the pin plate are formed from polymeric materials.Join the waitlist — get patent alerts
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