EP3538787A1 - Coaxial orbitless drive - Google Patents
Coaxial orbitless driveInfo
- Publication number
- EP3538787A1 EP3538787A1 EP17933642.5A EP17933642A EP3538787A1 EP 3538787 A1 EP3538787 A1 EP 3538787A1 EP 17933642 A EP17933642 A EP 17933642A EP 3538787 A1 EP3538787 A1 EP 3538787A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- offset
- axis
- central
- central axis
- carrier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H1/00—Toothed gearings for conveying rotary motion
- F16H1/02—Toothed gearings for conveying rotary motion without gears having orbital motion
- F16H1/20—Toothed gearings for conveying rotary motion without gears having orbital motion involving more than two intermeshing members
Definitions
- the disclosure herein relates to a drive comprising a plurality of gears or other engaging members. More particularly, it relates to an apparatus providing two members that rotate at different rates.
- An orbitless drive comprises a central pinion (sun) and a group of offset pinions (planets) which circulate on a pair of carriers.
- the central pinion may engage the offset pinions either directly or through a coupling, as disclosed in the prior art.
- the central pinion and carrier may be attached to an externally supported rotating shaft.
- This external support may be sufficient to provide alignment, mechanical support and rotatably coupling, thereby eliminating the need for explicit support and rotatable coupling within the orbitless drive.
- the exemplary embodiments disclosed herein depict an orbitless drive with no explicit mechanical support or rotatable coupling of the central pinion or carrier. This results in fewer parts, reduced cost, a smaller envelope, and allows the pinions to self-align for reduced friction, higher efficiency and longer life.
- Certain exemplary embodiments disclosed herein include offset pinions with a second offset axis that is rotatably coupled with a second offset carrier. This result in lower internal forces and improved inertial balance when the case is permitted to rotate.
- Certain exemplary embodiments comprise a reference member (79), a central carrier (9), a first offset carrier (19) and two or more offset members (39), each defining a central axis (70,0,10,30), wherein the reference member (79) and all offset members (39) each comprise a first offset axis (71,31) which is substantially parallel to, and spaced a first offset distance (91) apart from the corresponding central axis (70,30), the central carrier (9) and first offset carrier (19) each comprise a plurality of first radial axes (1,11) which are all substantially parallel to, spaced a first radial distance (93) apart from, and arranged circumferentially around the corresponding central axis (0,10), each offset member (39) central axis (30) and a different central carrier (9) first radial axis (1) are rotatably coupled (80), each offset member (39) first offset axis (31) and a different first offset carrier (19) first radial axis (11) are rotatably coupled
- Certain exemplary embodiments further comprise a second offset carrier (29) defining a central axis (20) and wherein, the reference member (79) and all offset members (39) each further comprise a second offset axis (72,32) which is substantially parallel to, and spaced a second offset distance (92) apart from the corresponding central axis (70,30), the second offset carrier (29) comprises a plurality of first radial axes (21) which are all substantially parallel to, spaced a first radial distance (93) apart from, and arranged circumferentially around the central axis (20), each offset member (39) second offset axis (32) and a different first radial axis (21) are rotatably coupled (82), and the central axis (20) and reference member (79) second offset axis (72) are rotatably coupled (84).
- Certain exemplary embodiments further comprise a first central member (41) which simultaneously engages (89) all offset members (39).
- Certain exemplary embodiments further comprise a second central member (42) and one or more coupling members (59) wherein each coupling member (59) simultaneously engages (88,87) one or more offset members (39) and the second central member (42).
- the central carrier (9) further comprises a number of second radial axes (2) equal to the number of coupling members (59), all second radial axes (2) are substantially parallel to, spaced a second radial distance (94) apart from, and arranged circumferentially around the central axis (0), and each coupling member (59) defines a central axis (50) which is rotatably coupled (85) with a different second radial axis (2).
- Fig 1 is a schematic side and front view in accordance with a first exemplary embodiment depicting the present invention.
- Fig 2 is a schematic side and front view in accordance with the first exemplary embodiment further comprising a second offset carrier (29).
- FIG 3 is a schematic side and front view in accordance with the first exemplary embodiment further comprising a first central member (41).
- Fig 4 is a schematic side and front and front view in accordance with the first exemplary embodiment further comprising a second offset carrier (29) and a first central member (41).
- FIG 5 is a schematic side and front view in accordance with the first exemplary embodiment further comprising a plurality of flexible coupling members (59) and a second central member (42).
- FIG 6 is a schematic side and front view in accordance with the first exemplary embodiment further comprising a second offset carrier (29), a plurality of flexible coupling members (59) and a second central member (42).
- FIG 7 is a schematic side and front view in accordance with the first exemplary embodiment further comprising a plurality of coupling members (59) and a second central member (42).
- FIG 8 is a schematic side and front view in accordance with the first exemplary embodiment further comprising a second offset carrier (29), a plurality of coupling members (59) and a second central member (42).
- FIG 9 is a schematic side and front view in accordance with the first exemplary embodiment further comprising a plurality of coupling members (59), a first central member (41) and a second central member (42).
- FIG 10 is a schematic side and front view in accordance with the first exemplary embodiment further comprising a second offset carrier (29), a plurality of coupling members (59), a first central member (41) and a second central member (42).
- Fig 11 is a perspective view of two exemplary offset member (39).
- Fig 12 is a schematic side view in accordance with a first exemplary practical implementation of the present invention.
- Fig 13 is a schematic side view in accordance with a second exemplary practical implementation of the present invention.
- a gear, sprocket, pulley, friction or magnetic coupling, or any other type of member that engages and transmits power to a mate is defined as an engaging member.
- An engaging member that engages on its exterior surface is defined as a pinion.
- An engaging member that engages on its interior surface is defined as a ring.
- a cable drive comprising two counter-acting, pre-loaded cables that are fixedly attached to two pulleys, is defined as a capstan cable coupling.
- a chain, belt, cable, or any other means that changes shape while engaging two or more engaging members is defined as a flexible coupling.
- a flexible coupling that simultaneously engages three or more engaging members is defined as a serpentine coupling.
- An apparatus that scales the relative speed and torque of two rotating members is defined as a drive, which may or may not comprise any gears.
- a drive that reduces velocity and amplifies torque is defined as a reduction drive.
- a drive that amplifies velocity and reduces torque is defined as an overdrive drive.
- a drive that may function as either a reduction or an overdrive drive is defined as back- drivable.
- a drive that may function as a reduction drive but not as an overdrive is defined as self- locking.
- spur gears are depicted in the accompanying drawings, it is understood that many other engaging means would suffice, such as conical, radial, offset, spiral, helical, double helical, herring-bone, or roller tooth gears, friction or magnetic couplings, chains and sprockets, or capstan cable couplings. It is also understood that associated gears may comprise any face width, tooth profile, pressure angle, or module and may be made from metal, plastic, or any other appropriate material.
- a coupling member (59) is depicted as a pinion in the accompanying drawings, it is understood that it may be often be replaced by a flexible coupling member and that a plurality of flexible coupling members may often be replaced by a serpentine coupling member.
- each offset member (39) is depicted in the accompanying drawings as comprising a single central rotatable coupling (80), it is understood that a second central rotatable coupling (80) could be added to the opposite side for symmetry.
- offset members (39) are depicted in the accompanying drawings as being substantially equivalent, it is understood that neighboring offset members (39) may comprise gear teeth that are out of phase with the first and second offset axes (31,32) to improve assemble-ability.
- first and second radial axes (1,2,11,21) are depicted in the accompanying drawings as being circumferentially equally spaced around the corresponding central axis (0,10,20), it is understood that they may be unequally spaced, although vibration may result.
- a back-drivable drive may provide either reduction or overdrive gearing by interchanging the roles of its high-speed and low-speed members.
- the roles of the reference, high-speed member and low-speed member may all be interchanged to obtain a desired reduction or overdrive ratio, or to cause the associated members to rotate in the same or opposite directions.
- a differential mechanism is obtained. Reduction, overdrive, differential, and reverse drives are all contemplated.
- any one of the reference member (79), any central member (41,42), any offset member (39), or any carrier (9,19,29) may act as a reference, input or output member.
- Fig 1 illustrates a first exemplary embodiment of the present invention.
- the first exemplary embodiment comprises a reference member (79), a central carrier (9), a first offset carrier (19) and two or more offset members (39).
- the reference member (79) comprises a central axis (70) and a first offset axis (71).
- the first offset axis (71) is substantially parallel to, and spaced a first offset distance (91) apart from the central axis (70).
- Each offset member (39) comprises a central axis (30) and a first offset axis (31).
- Each first offset axis (31) is substantially parallel to, and spaced the first offset distance (91) apart from the corresponding central axis (30).
- the central carrier (9) comprises a central axis (0) and a number of first radial axes (1) equal to the number of offset members (39). [59] All first radial axes (1) are substantially parallel to, spaced a first radial distance (93) apart from, and arranged circumferentially around the central axis (0).
- the first offset carrier (19) comprises a central axis (10) and a number of first radial axes (11) equal to the number of offset members (39).
- All first radial axes (11) are substantially parallel to, spaced the first radial distance (93) apart from, and arranged circumferentially around the central axis (10).
- Each central axis (30) is substantially co-axial, and rotatably coupled (80) with a different first radial axis (1).
- Each first offset axis (31) is substantially co-axial, and rotatably coupled (81) with a different first radial axis (11).
- the central axis (10) is substantially co-axial, and rotatably coupled (83) with the first offset axis (71).
- FIG 2 illustrates a second exemplary embodiment of the present invention which comprises the features of the first exemplary embodiment and further comprises a second offset carrier (29).
- the reference member (79) further comprises a second offset axis (72) which is substantially parallel to, and spaced a second offset distance (92) apart from the central axis (70).
- Each offset member (39) further comprises a second offset axis (32) which is substantially parallel to, and spaced the second offset distance (92) apart from the corresponding central axis (30).
- the second offset carrier (29) comprises a central axis (20) and a number of first radial axes (21) equal to the number of offset members (39).
- All first radial axes (21) are substantially parallel to, spaced the first radial distance (93) apart from, and arranged circumferentially around the central axis (20).
- Each second offset axis (32) is substantially co-axial, and rotatably coupled (82) with a different first radial axis (21).
- the central axis (20) is substantially co-axial, and rotatably coupled (84) with the second offset axis (72).
- FIG 3 illustrates a third exemplary embodiment of the present invention which comprises the features of the first exemplary embodiment and further comprises a first central member (41) which simultaneously engages (89) all offset members (39).
- Fig 4 illustrates a fourth exemplary embodiment of the present invention which combines the unique features of the first, second and third exemplary embodiments.
- FIG 5 illustrates a fifth exemplary embodiment of the present invention which combines the features of the first exemplary embodiment and further comprises a second central member (42) and a number of flexible coupling members (59) equal to the number of offset members (39).
- the second central member (42) is substantially co-axial with the central axis (70) and simultaneously engages (87) all flexible coupling members (59) which each engage (88) a different offset member (39).
- Fig 6 illustrates a sixth exemplary embodiment of the present invention which combines the unique features of the first, second and fifth exemplary embodiments.
- FIG 7 illustrates a seventh exemplary embodiment of the present invention which combines the features of the first exemplary embodiment and further comprises a second central member (42) and a number of coupling members (59) equal to the number of offset members (39).
- the second central member (42) is substantially co-axial with the central axis (70) and simultaneously engages (87) all coupling members (59) which each engage (88) a different offset member (39).
- the central carrier (9) further comprises a number of second radial axes (2) equal to the number of coupling members (59).
- All second radial axes (2) are substantially parallel to, spaced a second radial distance (94) apart from, and arranged circumferentially around the central axis (0).
- Each coupling member (59) further comprises a central axis (50) which is substantially co-axial, and rotatably coupled (85) with a different second radial axis (2).
- Fig 8 illustrates an eighth exemplary embodiment of the present invention which combines the unique features of the first, second and seventh exemplary embodiments.
- Fig 9 illustrates a ninth exemplary embodiment of the present invention which combines the unique features of the first, third and seventh exemplary embodiments.
- Fig 10 illustrates a tenth exemplary embodiment of the present invention which combines the unique features of the first, second, third and seventh exemplary embodiments.
- Fig 11 depicts two exemplary offset members (39a, 39b) that may be included in the second, fourth, eighth, or tenth exemplary embodiment of the present invention.
- Each offset member (39a, 39b) comprises a symmetric central shaft (33) that is co-axial with the central axis (30).
- One offset member (39a) illustrates a first offset shaft (34) that is co-axial with the first offset axis (31), and a second offset shaft (35) that is co-axial with the second offset axis (32).
- the other offset member (39b) illustrates a first offset bore (36) that is co-axial with the first offset axis (31), and a second offset bore (37) that is co-axial with the second offset axis (32).
- Fig 12 illustrates a first exemplary practical application of an orbitless drive (100) that corresponds to the fourth exemplary embodiment of the present invention.
- the first exemplary practical application comprises a motor (101), an orbitless drive (100) and a planetary drive (102).
- the reference members (79) of the motor (101), oribitless drive (100), and planetary drive (102) are all integral.
- the output shaft (113) of the motor (101) and the first central member (41) of the orbitless drive (100) are co-axial and integral.
- the input shaft (114) of the planetary drive (102) and the central carrier (9) of the orbitless drive (100) are co-axial and integral.
- FIG 13 illustrates a second exemplary practical application of an orbitless drive (100) that corresponds to the fourth exemplary embodiment of the present invention.
- the second exemplary practical application comprises an orbitless drive (100), an activate-able clutch (111), an activate-able brake (112), a high-speed drive-shaft (113), and a low-speed drive-shaft (114).
- the high-speed drive-shaft (113) and first central member (41) are co-axial and integral.
- the low-speed drive-shaft (114) and central carrier (9) are co-axial and integral.
- the central axes (0,70) are substantially co-axial due to mechanical constraints imposed by the first and second offset carriers (19,29).
- the central axes (0,70) are substantially co-axial due to mechanical constraints imposed by the first and second offset carriers (19,29).
- the first central member (41) and central axis (70) are substantially co-axial due to mechanical constraints imposed by the engagements (89).
- a seventh example considers the seventh exemplary embodiment illustrated in Fig 7.
- the second central member (42) and central axis (70) are substantially co-axial due to mechanical constraints imposed by the engagements (87).
- Each offset member (39) simultaneously engages (88) a coupling member (59) which engages (87) the second central member (42), causing it to rotate at a different rate than the central carrier (9).
- the first central member (41) and central axis (70) are substantially co-axial due to mechanical constraints imposed by the engagements (89).
- the second central member (42) and central axis (70) are substantially co-axial due to mechanical constraints imposed by the engagements (87).
- Each offset member (39) simultaneously engages (88) a coupling member (59) which engages (87) the second central member (42), causing it to rotate at a different rate than the central carrier (9).
- Both offset members (39a, 39b) comprise a symmetric pair of central shafts (33) providing the male component of the rotatable coupling (80) on the central axis (30).
- One offset member (39a) comprises offset shafts (34,35) providing the male components of the rotatable couplings (81,82) on the first and second offset axes (31,32).
- the other offset member (39b) comprises offset bores (36,37) providing the female components of the rotatable couplings (81,82) on the first and second offset axes (31,32).
- the drive- shaft (113) of the motor (101) provides co-axial alignment and rotatable coupling between the first central member (41) and the central axis (70) of the reference member (79).
- the drive- shaft (114) of the planetary drive (102) provides co-axial alignment and rotatable coupling between the central axis (0) of the first central carrier (9) and the central axis (70) of the reference member (79).
- Certain exemplary embodiments require fewer bearings than a conventional orbitless drive.
- Certain exemplary embodiments are less expensive to produce than a conventional orbitless drive.
- Certain exemplary embodiments have a smaller envelope than a conventional orbitless drive.
- Certain exemplary embodiments provide improved load sharing than a conventional orbitless drive.
- Certain exemplary embodiments have a higher torque capacity than a conventional orbitless drive.
- Certain exemplary embodiments develop less vibration when the entire assembly is rotated than a conventional orbitless drive.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Retarders (AREA)
- Rolling Contact Bearings (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/CA2017/051439 WO2019104410A1 (en) | 2017-11-29 | 2017-11-29 | Coaxial orbitless drive |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3538787A1 true EP3538787A1 (en) | 2019-09-18 |
EP3538787A4 EP3538787A4 (en) | 2020-04-29 |
Family
ID=66663708
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17933642.5A Withdrawn EP3538787A4 (en) | 2017-11-29 | 2017-11-29 | Coaxial orbitless drive |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3538787A4 (en) |
CN (1) | CN110177957A (en) |
WO (1) | WO2019104410A1 (en) |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB430054A (en) * | 1934-05-09 | 1935-06-12 | John Richard Kenny | Improvements in or relating to variable speed gearing |
US5833567A (en) * | 1997-03-26 | 1998-11-10 | Fernandez; Angel | Inertial power transmission |
US8747274B2 (en) * | 2012-11-08 | 2014-06-10 | Gm Global Technology Operations, Llc | Triple clutch multi-speed transmission |
US20140200109A1 (en) * | 2013-01-14 | 2014-07-17 | Leo James Stocco | Planetary Gear Pump |
EP3143305B1 (en) | 2014-05-12 | 2020-04-29 | Orbitless Drives Inc. | Orbitless gearbox |
US9829084B2 (en) * | 2014-06-27 | 2017-11-28 | GM Global Technology Operations LLC | Integrated gear assembly |
CN107208745B (en) * | 2014-09-10 | 2019-05-31 | 无轨道驾驶公司 | Hybrid rail-free gear-box |
-
2017
- 2017-11-29 WO PCT/CA2017/051439 patent/WO2019104410A1/en unknown
- 2017-11-29 EP EP17933642.5A patent/EP3538787A4/en not_active Withdrawn
- 2017-11-29 CN CN201780083318.2A patent/CN110177957A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
CN110177957A (en) | 2019-08-27 |
EP3538787A4 (en) | 2020-04-29 |
WO2019104410A1 (en) | 2019-06-06 |
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