WO2011127919A1 - Worm gear train - Google Patents
Worm gear train Download PDFInfo
- Publication number
- WO2011127919A1 WO2011127919A1 PCT/DE2011/075049 DE2011075049W WO2011127919A1 WO 2011127919 A1 WO2011127919 A1 WO 2011127919A1 DE 2011075049 W DE2011075049 W DE 2011075049W WO 2011127919 A1 WO2011127919 A1 WO 2011127919A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- worm wheel
- teeth
- curvature
- worm
- face
- 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
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/22—Toothed members; Worms for transmissions with crossing shafts, especially worms, worm-gears
-
- 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
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/08—Profiling
- F16H55/0853—Skewed-shaft arrangement of the toothed members
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2015/00—Gear wheels or similar articles with grooves or projections, e.g. control knobs
- B29L2015/003—Gears
Definitions
- the invention relates to a worm wheel with a globoidisch trained teeth having teeth.
- the globoidisch trained teeth have along the width of the worm wheel on a concave curvature.
- the gap width between two opposing teeth varies along the width of the worm wheel.
- the gap width between the teeth is minimal, whereas it is largest in the middle region between the end faces.
- the invention has the object to improve a generic worm wheel to the effect that it can be removed from a tool axially.
- the thickness of the teeth decreases from one end face of the worm wheel to the other end face.
- the thickness of the teeth preferably decreases monotonously.
- the worm wheel can be manufactured by casting or injection molding and removed axially from a tool in a direction in which the thickness of the teeth increases.
- the globoidische formation of the teeth, through which the teeth are concavely curved along its width improves a snug between a worm, which can engage the worm wheel, and the worm wheel, resulting in an optimization of the load capacity of the tooth roots and tooth flanks and a reduction of wear of the Teeth results.
- the benefits of the globoidally-formed teeth can be fully realized when the concave curvature has an ideal radius of curvature.
- the ideal radius of curvature provides a linear contact between the worm wheel and the worm.
- the ideal radius of curvature is problematic in practice, since he regards assembly inaccuracies of the spur gear or with This engaging gears or screws is critical, so it may cause malfunction of a transmission. Therefore, it is better to use a real radius of curvature deviating from the ideal radius of curvature, which is larger than the ideal radius of curvature. In this way, a trouble-free operation of the transmission is ensured, since even with a high-precision gearbox mounting is always expected with more or less low assembly inaccuracies.
- the end faces of the worm wheel may have different diameters.
- the worm wheel can be demolded axially in the direction of the end face with the larger diameter.
- the worm wheel can be made of a plastic and produced in an injection molding tool.
- the invention also relates to a transmission, in particular for steering a motor vehicle, with a worm wheel which engages in a worm, and according to the invention a worm wheel according to one of claims 1 to 5.
- the invention relates to a steering, in particular for a motor vehicle, in which according to the invention a transmission is provided according to claim 6.
- the steering may preferably be a steering with auxiliary electric power assistance.
- the transmission may be a transmission for converting a torque of an electric motor into a torque for auxiliary power assistance.
- FIGS. 1 a and 1 b is a sectional view of a transmission with a worm wheel and a worm according to the prior art
- FIGS. 2a and 2b show a sectional view of a transmission with a worm wheel according to the invention and a matching worm;
- Fig. 3 is an enlarged view of the view of Fig. 2b.
- FIG. 1 a shows a worm wheel 10 according to the prior art, which engages in a worm 1 1.
- Fig. 1 b shows a sectional view through three teeth 12 of the worm wheel 10.
- the teeth 12 are formed globoidisch.
- the teeth 12 along the width of the worm wheel 10 have a concave curvature. Consequently, the gap width between two adjacent teeth 12 in the region of end faces 13 and 14 is minimal, whereas it is maximum in the central region between the end faces 1 3 and 14.
- An axial demolding of the worm wheel 14 from a tool, as is customary for casting or injection molding, is not possible due to the gap widths between the adjacent teeth 12 decreasing towards the end faces 13 and 14.
- FIG. 2 a shows a worm wheel 20 according to the invention, which engages in a worm 21.
- FIG. 2b shows a sectional view through three teeth 22 of the worm wheel 20.
- the thickness of the teeth 22 decreases monotonically from the end face 24 to the end face 23. Consequently, the gap width between two adjacent teeth 22 increases monotonically from the end face 24 to the end face 23. It is the smallest in the area of the end face 24 and largest in the area of the end face 23.
- the worm wheel 20 is very suitable for production by casting or injection molding, since its removal from the mold to the right without any hindrance is possible.
- lines 25, 26 and 27 are shown in Fig. 2b.
- the lines 25 and 27 correspond to the end faces 13 and 14 of the known from the prior art worm wheel 10 (see Fig. 1 b).
- On the line 26 and a line 28 are points at which a pressure-free contact between the worm wheel 10 and 20 and the worm 1 1 or 21 results during operation.
- the lines 26 and 28 are in the middle of the worm wheel 10 or 20. Left and right of the lines 26 and 28 results between the teeth 12 or 22 of the worm wheel
- FIG. 2b shows that, due to the monotonous decrease in the thickness of the teeth 22, from the end face 24 to the end face 23, the line 26 representing the pressure-free contact shifts to the right towards the line 28.
- the teeth 22 are also designed so that they also have the concave curvature along the width of the worm wheel 20.
- the illustrated curvature corresponds to a real radius of curvature as used in practice.
- FIG. 3 shows two ideal bends 30 and 31 on the central tooth 22, which are shown by broken lines.
- the ideal curvatures 30 and 31 correspond to an ideal radius of curvature
- the real curvatures of the teeth 22 correspond to a real radius of curvature.
- Between the bends 30 and 31 and the teeth 22 are wedge-shaped portions 32, 33, 34 and 35. The larger the difference between the real and the ideal radius of curvature, the larger are the wedge-shaped portions 32, 33, 34 and 35.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gears, Cams (AREA)
- Gear Transmission (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112011101312T DE112011101312A5 (en) | 2010-04-14 | 2011-03-25 | worm gear |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201010027744 DE102010027744A1 (en) | 2010-04-14 | 2010-04-14 | transmission |
DE102010027744.4 | 2010-04-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2011127919A1 true WO2011127919A1 (en) | 2011-10-20 |
Family
ID=44140919
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2011/075049 WO2011127919A1 (en) | 2010-04-14 | 2011-03-25 | Worm gear train |
Country Status (2)
Country | Link |
---|---|
DE (2) | DE102010027744A1 (en) |
WO (1) | WO2011127919A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102018201008A1 (en) | 2018-01-23 | 2019-07-25 | Ford Global Technologies, Llc | Component for worm gear with concave recess in tooth flanks |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5857770B2 (en) | 2012-02-07 | 2016-02-10 | 株式会社ジェイテクト | Worm wheel manufacturing method and worm wheel manufacturing apparatus |
DE102012023462B4 (en) | 2012-11-30 | 2022-11-17 | Volkswagen Aktiengesellschaft | Motor vehicle steering with worm gear |
DE102014211402A1 (en) * | 2014-06-13 | 2015-12-17 | Robert Bosch Gmbh | Motor vehicle actuator or wiper drive with a worm gear or Schneckenschraubradgetriebe |
DE102016222115A1 (en) * | 2016-11-10 | 2018-05-17 | Robert Bosch Gmbh | Spur gear for a worm gear, use of the spur gear and injection molding tool for producing the spur gear |
DE102017216950A1 (en) | 2017-09-25 | 2019-03-28 | Robert Bosch Gmbh | Transmission of a steering system of a vehicle |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1790607A (en) * | 1929-03-11 | 1931-01-27 | Nikola Trbojevich | Steering gear |
US2935887A (en) * | 1957-11-12 | 1960-05-10 | Wildhaber Ernest | Enveloping worm gearing |
US4047449A (en) * | 1976-01-29 | 1977-09-13 | Valentin Alexeevich Popov | Globoid worm gearing and method of making globoid worm thereof |
EP0047593A2 (en) * | 1980-08-29 | 1982-03-17 | Mastergear Company Limited | Wormwheel gears |
DE202005008274U1 (en) * | 2004-06-03 | 2005-10-20 | Iku Holding Montfoort B.V. | Mass-produced planetary gear, for vehicle mirror adjustment mechanisms, uses injection molded or sintered plastics cogwheels with tooth flanks converging and diverging in the same direction around their center lines |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1404816A (en) * | 1920-05-13 | 1922-01-31 | Joseph C Wegstein | Gear wheel |
US2069433A (en) * | 1933-10-05 | 1937-02-02 | Wildhaber Ernest | Gear drive |
GB2130683B (en) * | 1982-11-25 | 1986-03-19 | Mastergear Co Ltd | Wormwheel and method of producing same |
DE19957440A1 (en) * | 1999-11-29 | 2001-06-13 | Bosch Gmbh Robert | Helical gear for a worm gear and a mold for producing such a helical gear |
JP2001280428A (en) * | 2000-03-31 | 2001-10-10 | Toyoda Mach Works Ltd | Worm gear apparatus |
FR2822915B1 (en) * | 2001-04-03 | 2005-02-25 | Commerciale Et D Engineering S | DEVICE FOR TRANSMISSION BETWEEN A PRIMARY MOTOR SHAFT AND A TURF MOWER OUTPUT ARRANGEMENT COMPRISING SUCH A DEVICE |
JP2009008201A (en) * | 2007-06-29 | 2009-01-15 | Toyoda Gosei Co Ltd | Worm gear device |
JP2009121499A (en) * | 2007-11-12 | 2009-06-04 | Hitachi Ltd | Worm gear and electric power steering device |
-
2010
- 2010-04-14 DE DE201010027744 patent/DE102010027744A1/en not_active Withdrawn
-
2011
- 2011-03-25 DE DE112011101312T patent/DE112011101312A5/en not_active Ceased
- 2011-03-25 WO PCT/DE2011/075049 patent/WO2011127919A1/en active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1790607A (en) * | 1929-03-11 | 1931-01-27 | Nikola Trbojevich | Steering gear |
US2935887A (en) * | 1957-11-12 | 1960-05-10 | Wildhaber Ernest | Enveloping worm gearing |
US4047449A (en) * | 1976-01-29 | 1977-09-13 | Valentin Alexeevich Popov | Globoid worm gearing and method of making globoid worm thereof |
EP0047593A2 (en) * | 1980-08-29 | 1982-03-17 | Mastergear Company Limited | Wormwheel gears |
DE202005008274U1 (en) * | 2004-06-03 | 2005-10-20 | Iku Holding Montfoort B.V. | Mass-produced planetary gear, for vehicle mirror adjustment mechanisms, uses injection molded or sintered plastics cogwheels with tooth flanks converging and diverging in the same direction around their center lines |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102018201008A1 (en) | 2018-01-23 | 2019-07-25 | Ford Global Technologies, Llc | Component for worm gear with concave recess in tooth flanks |
DE102018201008B4 (en) | 2018-01-23 | 2020-07-09 | Ford Global Technologies, Llc | Component for worm gear with concave recess in tooth flanks |
Also Published As
Publication number | Publication date |
---|---|
DE112011101312A5 (en) | 2013-02-07 |
DE102010027744A1 (en) | 2011-10-20 |
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