WO2002052176A1 - Multistage planetary speed reducer - Google Patents
Multistage planetary speed reducer Download PDFInfo
- Publication number
- WO2002052176A1 WO2002052176A1 PCT/IT2001/000640 IT0100640W WO02052176A1 WO 2002052176 A1 WO2002052176 A1 WO 2002052176A1 IT 0100640 W IT0100640 W IT 0100640W WO 02052176 A1 WO02052176 A1 WO 02052176A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- stage
- speed reducer
- fact
- per
- ring
- Prior art date
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
- F16H57/00—General details of gearing
- F16H57/08—General details of gearing of gearings with members having orbital motion
-
- 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
- F16H1/28—Toothed gearings for conveying rotary motion with gears having orbital motion
- F16H1/46—Systems consisting of a plurality of gear trains each with orbital gears, i.e. systems having three or more central gears
Definitions
- Multistage planet speed reducers consisting of a first stage involving a first sun gear driven by the coaxial driving shaft, a first set of planet gears carried by a first carrier disc and meshing with the first sun gear and with a first fixed ring gear; and at least a second stage consisting of a second sun gear driven by the coaxial first carrier disc, a second set of planet gears carried by a second carrier and meshing with the second sun gear and with a second fixed ring gear.
- Available, in particular, are multistage planet gear speed reducers with high torque, with spur gears, each of the toothed rings being rigidly fixed in their own casing or themselves constituting the casing. The diameter of the stages gradually increases from the initial to the final stage, just as the output torque of each stage.
- the aim of the present invention is to solve this problem by devising a multistage planet gear reducer with spur gear meshing that will provide a reduction in noise.
- a further aim of the present invention is to provide a multistage planet gear reducer with spur gear meshing that shall be simple in conception, reliable in working and versatile in use.
- a multistage planet gear with spur gear meshing of the type comprising at least one first stage consisting of a first sun gear driven by the coaxial driving shaft, a first set of planet gears carried by a first carrier disc and meshing with the said first sun gear and with a first fixed ring gear; and a second stage consisting of a second sun gear driven by the said coaxial first carrier disc, a second set of planet gears carried by a second carrier disc and meshing with the said second sun gear and with a second fixed ring gear;
- this scheme is characterized by the fact that at least the first stage presents a contact ratio greater than 2, and by the fact that the first and second rings are inserted in a single cylindrical casing and are centred with narrow tolerance with respect to the axis of the drive shaft.
- the multistage planetary speed reducer with spur gears is indicated by 1 as a whole.
- the unit 1 involves a first stage 10 consisting of a first sun gear 11 driven by the coaxial driving shaft 2, a first set of planet gears 12 carried by a first carrier disc 13, rotating by means of roller-bearings 16 on their own pins 14, and meshing with the first sun gear 11 and with a first fixed ring gear 15.
- the first stage 10 is accompanied by at least a second stage 20 consisting of a second sun gear 21 driven by the coaxial first carrier disc 13, a second set of planet gears 22 carried by a second carrier disc 23, said planets rotating by means of roller-bearings 26 on their own pins 24, and meshing with the second sun gear 21 and with a second fixed ring gear 25.
- the pins 14, 24 are blocked in the relevant carrier discs 13, 23 by forcing, if need be with knurling.
- the second carrier disc 23 drives the coaxial output shaft 3 of the unit.
- the torque transmission from the first carrier disc 13 to the second sun gear 21 and from the second carrier disc 23 to the output shaft 3 is effected, for example, by means of the respective splined shaft ends.
- the first 15 and second 25 ring gears have preferably equal external diameters and are fixed in a single cylindrical casing 5; they are also centred with narrow tolerance with respect to the axis of the driving shaft 2. Mounting the ring gears 15, 25 in a single casing 5 facilitates centring of the one to the other and of both with respect to the axis of the driving shaft.
- the cylindrical casing 5 can be directly flanged to the motor by a portion of the head 50 that extends from the cylindrical casing 5 and is in the form of the flange 51.
- a sleeve 4 rotating on ball- bearings, in which the driving shaft 2 is set.
- the ring gears 15, 25 are fixed, by screw devices 7, between a shoulder of the casing 5 and a counterposed head 52 and are also traversed by longitudinal pins 8.
- the output shaft 3 rotates on roller-bearings 9.
- the head 50 presenting the flange 51 can be connected, instead of directly to the motor, to any intermediate mechanism; or it can be absent and, instead of the sleeve 4, there may be an protruding input shaft, supported by appropriate rotating elements, for driving by any means, e.g. coupling, pulley, toothed wheel.
- the first carrier disc 13 of the first stage 10 is appropriately centred by means of rolling coupling in the first ring gear 15. This rolling coupling is achieved preferably by interposing rolling elements, e.g. a radial rigid ballbearing (not shown in the figure).
- At least the first stage 10 presents a contact ratio greater than 2 in the meshing both between sun gear and planet gears and between planet gears and ring gear.
- This contact ratio greater than 2 can be achieved with a high number of teeth, i.e. with small module; the said contact ratio can also be effected with a low pressure angle between the teeth and/or with a greater height of the said teeth. This provides a considerable reduction in noise in the first stage, which, being the fastest, tends to be the noisiest.
- For the contact ratio greater than 2 enables . alternation between two or three pairs of mating teeth, and the behaviour is not dissimilar to that of helical gears.
- the possibility is provided to make the external diameter of the ring 15 of the first stage 10 equal to that of the ring 25 of the second stage 20, by setting both rings 15, 25 in a single cylindrical casing 5.
- this casing 5 is also preferably flanged directly to the motor, so that the ring gear 15 of the first stage 10 will enable good centring of the planet gears by means of rolling coupling, with possible insertion of a radial rigid ball-bearing, which will also enhance the parallelism between the planet gears and the drive shaft.
- the construction of the teeth of the first stage 10 requires special tools with higher than normal teeth and low pressure angle. It will therefore be as well to adopt a module such that the root diameter of the internal teeth of the first ring gear 15 be equal to that of the ring gear 25 of the second stage 20. Obviously the unit can be equipped with further stages. These proceed by gradually increasing diameter, in the usual manner.
- the multistage planetary speed reducer with spur gear meshing here described thus achieves the aim of noise reduction. It should be noted that this result is obtained with a simple, functional structure that does not entail heavier costs as compared with traditional structures.
- the reducer may have, in itself, two degrees of freedom, as the rotating rings are driven by external elements in such a way as to remove a degree of freedom.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE60115283T DE60115283T2 (en) | 2000-12-22 | 2001-12-19 | MULTI-STAGE PLANET SUBSTATION GEAR |
AT01994945T ATE310917T1 (en) | 2000-12-22 | 2001-12-19 | MULTI STAGE PLANETARY REDUCTION GEAR |
EP01994945A EP1343988B1 (en) | 2000-12-22 | 2001-12-19 | Multistage planetary speed reducer |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITBO00A000744 | 2000-12-22 | ||
IT2000BO000744A ITBO20000744A1 (en) | 2000-12-22 | 2000-12-22 | MULTI-STAGE PLANETARY REDUCER |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2002052176A1 true WO2002052176A1 (en) | 2002-07-04 |
WO2002052176B1 WO2002052176B1 (en) | 2002-10-03 |
Family
ID=11438934
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IT2001/000640 WO2002052176A1 (en) | 2000-12-22 | 2001-12-19 | Multistage planetary speed reducer |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1343988B1 (en) |
AT (1) | ATE310917T1 (en) |
DE (1) | DE60115283T2 (en) |
IT (1) | ITBO20000744A1 (en) |
WO (1) | WO2002052176A1 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006137603A1 (en) | 2005-06-20 | 2006-12-28 | Nung Jun Tae | Lever-type gear reducer |
WO2006137605A1 (en) | 2005-06-20 | 2006-12-28 | Nung Jun Tae | The transistor-type universal driving |
DE102010053010A1 (en) * | 2010-12-02 | 2012-06-06 | Sew-Eurodrive Gmbh & Co. Kg | Gearbox cover and gearbox |
DE102010053027A1 (en) * | 2010-12-02 | 2012-06-06 | Sew-Eurodrive Gmbh & Co. Kg | Shaft adapter unit, gearbox and drive unit |
KR101350229B1 (en) | 2013-11-20 | 2014-01-13 | 유영락 | Planetary gear type gear speed reducer |
US10378614B2 (en) | 2015-06-08 | 2019-08-13 | Sejin-iGB Co., Ltd. | Internal planetary reduction gear |
WO2023143883A1 (en) * | 2022-01-27 | 2023-08-03 | Zf Friedrichshafen Ag | Arrangement comprising planetary stages and a spline |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4380274A (en) * | 1980-04-22 | 1983-04-19 | Uwe Abraham | Holding a planetary gear carrier relative to an axle |
US4590820A (en) * | 1983-03-31 | 1986-05-27 | Dresser Industries, Inc. | Rotational power transmission apparatus |
US6080199A (en) * | 1996-10-02 | 2000-06-27 | Toyota Jidosha Kabushiki Kaisha | Gear designing method, gear manufacturing method, and gear manufactured by the same method |
US6099432A (en) * | 1997-09-09 | 2000-08-08 | Harmonic Drive Systems Inc. | Planetary gear device having a backlash adjusting mechanism |
-
2000
- 2000-12-22 IT IT2000BO000744A patent/ITBO20000744A1/en unknown
-
2001
- 2001-12-19 WO PCT/IT2001/000640 patent/WO2002052176A1/en active IP Right Grant
- 2001-12-19 AT AT01994945T patent/ATE310917T1/en not_active IP Right Cessation
- 2001-12-19 EP EP01994945A patent/EP1343988B1/en not_active Expired - Lifetime
- 2001-12-19 DE DE60115283T patent/DE60115283T2/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4380274A (en) * | 1980-04-22 | 1983-04-19 | Uwe Abraham | Holding a planetary gear carrier relative to an axle |
US4590820A (en) * | 1983-03-31 | 1986-05-27 | Dresser Industries, Inc. | Rotational power transmission apparatus |
US6080199A (en) * | 1996-10-02 | 2000-06-27 | Toyota Jidosha Kabushiki Kaisha | Gear designing method, gear manufacturing method, and gear manufactured by the same method |
US6099432A (en) * | 1997-09-09 | 2000-08-08 | Harmonic Drive Systems Inc. | Planetary gear device having a backlash adjusting mechanism |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006137603A1 (en) | 2005-06-20 | 2006-12-28 | Nung Jun Tae | Lever-type gear reducer |
WO2006137605A1 (en) | 2005-06-20 | 2006-12-28 | Nung Jun Tae | The transistor-type universal driving |
DE102010053010A1 (en) * | 2010-12-02 | 2012-06-06 | Sew-Eurodrive Gmbh & Co. Kg | Gearbox cover and gearbox |
DE102010053027A1 (en) * | 2010-12-02 | 2012-06-06 | Sew-Eurodrive Gmbh & Co. Kg | Shaft adapter unit, gearbox and drive unit |
DE102010053010B4 (en) * | 2010-12-02 | 2013-02-07 | Sew-Eurodrive Gmbh & Co. Kg | Gearbox cover and gearbox |
DE102010053027B4 (en) * | 2010-12-02 | 2013-03-21 | Sew-Eurodrive Gmbh & Co. Kg | Shaft adapter unit, gearbox and drive unit |
EP2646714A1 (en) * | 2010-12-02 | 2013-10-09 | Sew-Eurodrive GmbH & Co. KG | Transmission cover and transmission |
EP2646714B1 (en) * | 2010-12-02 | 2016-08-03 | Sew-Eurodrive GmbH & Co. KG | Transmission cover and transmission |
KR101350229B1 (en) | 2013-11-20 | 2014-01-13 | 유영락 | Planetary gear type gear speed reducer |
US10378614B2 (en) | 2015-06-08 | 2019-08-13 | Sejin-iGB Co., Ltd. | Internal planetary reduction gear |
EP3306133B1 (en) * | 2015-06-08 | 2022-08-10 | Sejin-igb Co., Ltd. | Internal planetary reduction gear |
WO2023143883A1 (en) * | 2022-01-27 | 2023-08-03 | Zf Friedrichshafen Ag | Arrangement comprising planetary stages and a spline |
Also Published As
Publication number | Publication date |
---|---|
DE60115283D1 (en) | 2005-12-29 |
WO2002052176B1 (en) | 2002-10-03 |
ITBO20000744A0 (en) | 2000-12-22 |
EP1343988B1 (en) | 2005-11-23 |
EP1343988A1 (en) | 2003-09-17 |
DE60115283T2 (en) | 2006-08-17 |
ITBO20000744A1 (en) | 2002-06-22 |
ATE310917T1 (en) | 2005-12-15 |
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