GB2275318A - Gear elements having resilient teeth - Google Patents

Gear elements having resilient teeth Download PDF

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Publication number
GB2275318A
GB2275318A GB9402496A GB9402496A GB2275318A GB 2275318 A GB2275318 A GB 2275318A GB 9402496 A GB9402496 A GB 9402496A GB 9402496 A GB9402496 A GB 9402496A GB 2275318 A GB2275318 A GB 2275318A
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United Kingdom
Prior art keywords
gear
teeth
flexible
odd
lash
Prior art date
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Withdrawn
Application number
GB9402496A
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GB9402496D0 (en
Inventor
Tai-Her Yang
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Individual
Original Assignee
Individual
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Filing date
Publication date
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Publication of GB9402496D0 publication Critical patent/GB9402496D0/en
Publication of GB2275318A publication Critical patent/GB2275318A/en
Withdrawn legal-status Critical Current

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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
    • F16H55/14—Construction providing resilience or vibration-damping
    • F16H55/16—Construction providing resilience or vibration-damping relating to teeth only

Abstract

A gear element 100 having resilient teeth is provided to reduce backlash and tooth noise, the resiliency being provided by a series of slots 101 extending inwardly from the base region between adjacent teeth. The slots may be filled with a resilient material (201 Fig 2 not shown). The gear element may take the form of a spur or pinion gear, a rack gear (Fig 3), an internal ring gear (Fig 4), a roller worm gear (Fig 5), a bevel gear (Fig 6), a worm wheel (Fig 7), or be one of a pair of inter-fitting coupling elements (Figs 8 and 9). <IMAGE>

Description

rITLE Flexible Back Lash Eliminating Design Rnd Structure.
SUMMNRY OF THE INVENTION The conventional gear root often relates to rigid structure so that practical gear system must be added auxiliary structure but related back lash and noise still remain as a headache. The present flexible back lash eliminating design and structure is thus made in order to solve the aforesaid problem. more specifically transformation lash is made between roots of gear to enable each pitch to appear cross difference value. After made into gear set engagement it will form a distribution greater than back lash and with bilateral cross flexible prestress for eliminating back lash during gearing; or further filling flexible stuff within transformation lash to minimize frictional noise.Because of gear roots with flexibility, the present invention is therefore suitable for medium-small power transfer while larger power may be obtained from increased tooth thickness or multiple gear sets arrangement.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagramatic view showing two gear sets to appear equi-oitch cross distribution and appear unequivalent phase difference distribution and with flexible gear root.
FIG. 2 is an embodiment showing shock-absorbing soft metal or plastic flexible material is filled in the lash of transformation root of gear of FIG. 1.
FIG. 3 is an embodiment showing the present flexible back lash eliminating design and structure is applied to rack gear set.
FIG. 4 is an embodiment showing the present flexible back lash eliminating design and structure applied to internal gear set.
FIG. 5 is an embodiment showing the present flexible back lash eliminating design and structure applied to roller type worm gear set.
FIG. 6 is an embodiment showing the present flexible back lash eliminating design and structure applied to bevel gear set.
FIG. 7 is an embodiment showing the present flexible back lash eliminating design and structure applied to worm gear set.
FIG. 8 is an embodiment showing the present flexible back lash eliminating design and structure applied to axial harmonic gear.
FIG. 9 is an embodiment showing the present flexible back lash design and structure applied to axial harmonic gear set with toothes coupler.
DETAILED DESCRIPTION OF THE INVENTION The present design relates to flexible back lash eliminating design and structure that form a distribution greater than back lash and with bilateral cross flexible prestress for eliminating back lash during gearing so as to minimize frictional noise during gearing. which is characterized by: two gear sets with equi-pitch cross distribution and unequivalent phase difference distribution, at least one gear set having flexible-root gear sets gearing, with distribution greater than back lash and with flexible tension.
The aforesaid structural principle is described below: FIG. 1 is a diagramatic view showing two gear sets to appear equi-pitch cross distribution and appear unequivalent phase difference distribution and with flexible gear root, comprising gear set 100 peripherally distributed with odd numbers of teeth T1, T3, T5, T7...., even numbers of teeth T2, T4, T6.
T8 wherein pitch between each two odd teeth is 2P, each two even teeth is also 2P; pitch between each two odd teeth and even tooth as well as each two even teeth and odd teeth is unequivalent; both sides of each tooth root have transformation lash 101 cut in toward the center of circle to enable each tooth root with flexibility; upon engaging gear sets. the aforesaid specific pitch and flexible tooth root enables engaging teeth between gear sets to appear different-direction flexible back-lash free for the aforesaid odd-even teeth engaging and teeth engaging between two different gear sets whereby back lash is eliminate and frictional noise reduced during gearing.
FIG. 2 is an embodiment showing flexible material 201 is filled in the lash of transformation root of gear teeth mainly for preventing noise caused by vibration during quick return of transformation teeth relatively disengaging.
Based on the principle shown in FIG. 1, we may apply it to right gear, bevel gear, rack gear set, worm gear set, internal gear, external gear, planet gear, harmonic gear, roller gear or toothed clutch.
FIG. 3 is an embodiment showing the present flexible back lash eliminating design and structure is applied to rack gear set, comprising: 1. connection of gear having flexible teeth and odd-even unequal phase difference with rigid rack; 2. connection of rigid odd-even unqual difference gear with flexible equi-pitch rack; 3. connection of flexible gear with rack of odd-even unequal phase difference.
FIG. 4 is an embodiment showing the present flexible back lash eliminating design and structure applied to internal gear set.
FIG. 5 is an embodiment showing the present flexible back lash eliminating design and structure applied to roller type worm gear set, FIG. 6 is an embodiment showing the present flexible back lash eliminating design and structure applied to bevel gear set.
FIG. 7 is an embodiment showing the present flexible back lash eliminating design and structure applied to worm gear set.
FIG. 8 is an embodiment showing the present flexible back lash eliminating design and structure applied to harmonic gear, wherein harmonic gear has produced differential displacement depending on different number of teeth between swinging bevel drive gear with driven gear because when the present flexible back lash eliminating design and structure is applied to swinging press-fit gears, not only with aforesaid transformation lash 801 at the tooth root but also with stuff, and further with relative press-fit by means of pre-tension after fitted or spring or fluid for packing two gears, and relative press-fit teeth in normal form but further greater angle 02 than tooth-form angle 01, i.e. 02 > 01 to compensate flexible transformed angle displacement during driving so as to guide relatively press-fit teeth point to avoid mutual interference.
FIG. 9 is an embodiment showing the present flexible back lash design and structure applied to harmonic gear set with tooth coupler wherein harmonic gear except with swinging bevel drive gear and driven gear as shown in FIG. 8, for producing differential displacement due to difference in the number of teeth between both, and differential displacement output is provided for rotary power transmission by means of teeth point with synco toothed coupler for guiding obtuse angle.
Except transformation lash between teeth, there is transformation lash between the teeth of synco toothed coupler, and toothed point is made in form of inverted obtuse angle or inverted arc against original tooth form, and packing pre-tension existing after teeth engagement or spring pre-tension or fluid pre-tension available for eliminating back lash, and further filled in shock-absorbing soft metal or plastic flexible material to reduce noise.Referring to FIGs. 8 and 9 teeth relationship between gear set and synco clutch is arranged as odd-even unequal pitch, and further may appear equi-angle distribution while teeth point cut with guide-in bevel obtuse angle, and using spring or fluid as pre-tension packing for eliminating back lash after two teeth engagement; the aforesaid flexible back lash eliminating design and structure synco coupling clutch may be independently applied to other mechanism.
The present flexible back lash eliminating design and structure assembly may include: 1. Drive side with flexible and odd-even unequal pitch phase-difference drive gear engaging with rigid equal-pitch driven gear set at driven side; 2. Drive side with rigid and odd-even unequal pitch phase-difference drive gear engaging with flexible equal-pitch driven gear set; 3. Drive side with rigid and odd-even equal-pitch engaging with rigid odd-even unequal phase-difference driven gear set; 4. Drive side with rigid and odd-even equal-pitch engaging with flexible odd-even unequal phase-difference driven gear set.
5. Both drive and driven sides with flexible odd-even unequal-pitch gear sets.
Referring to the applications in FIG. 1 thru FIG.
9, flexible lash of various gear sets may further be filled soft metal or plastic material as stuff for absorbing noise, and such stuff may include which for flexible lash of equal-pitch gears.

Claims (7)

CLAIMS;
1. Q flexible back lash eliminating design and structure relates to transformation lash is made between roots of gear to enable each pitch to appear cross difference value, after made into gear set engagement, it will form a distribution greater than back lash and with bilateral cross flexible prestress for eliminating back lash during gearing; or further filling flexible stuff within transformation lash to minimize frictional noise, comprising gear set 100 peripherally distributed with odd numbers of teeth T1, T3, T5, T7... , even numbers of teeth T2, T4, T6, T8 wherein pitch between each two odd teeth is 2P, each two even teeth is also 2P; pitch between each two odd teeth and even tooth as well as each two even teeth and odd teeth is unequivalent; both sides of each tooth root have transformation lash 101 cut in toward the center of circle to enable each tooth root with flexibility; upon engaging gear sets. the aforesaid specific pitch and flexible tooth root enables engaging teeth between gear sets to appear different-direction flexible back-lash free for the aforesaid odd-even teeth engaging and teeth engaging between two different gear sets whereby back lash is eliminate and frictional noise reduced during gearing.
2. The flexible back lash eliminating design and structure according to claim 1 including application to right gear, bevel gear, rack gear set, worm gear set internal gear, external gear, planet gear.
harmonic gear. roller aear or toothed clutch.
including: 1. Drive side with flexible and odd-even unequal pitch phase-difference drive gear engaging with rigid equal-pitch driven gear set at driven side: 2. Drive side with rigid and odd-even unequal pitch phase-difference drive gear engaging with flexible equal-pitch driven gear sets 3. Drive side with rigid and odd-even equal-pitch engaging with rigid odd-even unequal phase-difference driven gear set; 4. Drive side with rigid and odd-even equal-pitch engaging with flexible odd-even unequal phase-difference driven gear set.
5. Both drive and driven sides with flexible odd-even unequal-pitch gear sets.
3. The flexible back lash eliminating design and structure according to claim 1, which is applied to rack gear set, comprising: 1. connection of gear having flexible teeth and odd-even unequal phase difference with rigid rack; 2. connection of rigid odd-even unqual difference gear with flexible equi-pitch rack; 3. connection of flexible gear with rack of odd-even unequal phase difference.
4. The flexible back lash eliminating design and structure according to claim 1, which is applied to harmonic gear. wherein harmonic gear has produced differential displacement depending on different number of teeth between swinging bevel drive gear with driven gear because when the present flexible back lash eliminating design and structure is applied to swinging press-fit gears, not only with aforesaid transformation lash 801 at the tooth root but also with stuff, and further with relative press-fit by means of pre-tension after fitted or spring or fluid for packing two gears, and relative press-fit teeth in normal form but further greater angle 02 than tooth-form angle 01, i.e. 02 > 01 to compensate flexible transformed angle displacement during driving so as to guide relatively press-fit teeth point to avoid mutual interference.
5. The flexible back lash eliminating design and structure according to claim 1, which is applied to harmonic gear set with tooth coupler wherein harmonic gear except with swinging bevel drive gear and driven gear for producing differential displacement due to difference in the number of teeth between both. and differential displacement output is provided for rotary power transmission by means of teeth point with synco toothed coupler for guiding obtuse angle, except transformation lash between teeth, there is transformation lash between the teeth of synco toothed coupler, and toothed point is made in form of inverted obtuse angle or inverted arc against original tooth form, and packing pre-tension existing after teeth engagement or spring pre-tension or fluid pre-tension available for eliminating back lash.
6. The flexible back lash eliminating design and structure according to claim 1, teeth relationship between gear set and synco clutch is arranged as odd-even unequal pitch, and further may appear equi-angle distribution while teeth point cut with guide-in bevel obtuse angle, and using spring or fluid as pre-tension packing for eliminating back lash after two teeth engagement.
7. The flexible back lash eliminating design and structure according to claim 1 or 2 or 3 or 4 or 5 or 6, flexible lash of various gear sets may further be filled soft metal or plastic material as stuff for absorbing noise, and such stuff may include which for flexible lash of equal-pitch gears.
GB9402496A 1993-02-22 1994-02-09 Gear elements having resilient teeth Withdrawn GB2275318A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB939303487A GB9303487D0 (en) 1993-02-22 1993-02-22 Structure and device for extinguishing flexible gear lash

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GB9402496D0 GB9402496D0 (en) 1994-03-30
GB2275318A true GB2275318A (en) 1994-08-24

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GB9402496A Withdrawn GB2275318A (en) 1993-02-22 1994-02-09 Gear elements having resilient teeth

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5636550A (en) * 1993-12-06 1997-06-10 Perkins Limited No-backlash gearing mechanism
US6047607A (en) * 1997-05-26 2000-04-11 Bayerische Motoren Werke Aktiengesellschaft Transmission gear wheel with damping capability
GB2352017A (en) * 1999-07-14 2001-01-17 Mannesmann Sachs Ag Coupling assembly
US6364781B2 (en) 1998-02-09 2002-04-02 Mannesmann Sachs Ag Installation apparatus for a coupling device having a holder, which is provided on a flywheel mass, for a driver
DE20215041U1 (en) * 2002-09-26 2003-11-06 Brose Fahrzeugteile Gear element has body consisting at least partially of elastic material so that meshing elements on body are movable in relation to each other and consist of another more dimensionally stable material than elastic section of body
US6883656B2 (en) 2002-07-16 2005-04-26 Borgwarner, Inc. Driver unit for multi-disk clutch systems
US6915892B2 (en) * 2002-06-15 2005-07-12 Borgwarner Inc. Driving plate for multi-plate clutch system
US6938747B2 (en) * 2001-04-11 2005-09-06 Volkswagen Ag Transmission with a rattle-free connection between the clutch basket and the driving disc
US7007783B2 (en) 2002-11-19 2006-03-07 Borgwarner Inc. Axially fixed and adjustable drive plate
DE102004037540A1 (en) * 2004-08-03 2006-03-16 Micromotion Gmbh Gearwheel for transmission, especially harmonic drive transmission, has at least one tooth space with at least one undercut, an undercut in region of tooth crown, or undercut may extend in body of tooth
CN102966721A (en) * 2012-11-29 2013-03-13 四川大学 Filtering gear with high reliability and precision
CN102966703A (en) * 2012-11-29 2013-03-13 四川大学 Filtering reducer with high reliability and precision
CN105114598A (en) * 2015-09-25 2015-12-02 江苏太平洋齿轮传动有限公司 Relieving structure for bending stress of tooth roots of straight bevel gear
DE102020201495A1 (en) 2020-02-07 2021-08-12 Zf Friedrichshafen Ag Gear, spur gear with this gear, as well as automatic gear with this spur gear
CN113811703A (en) * 2019-04-01 2021-12-17 詹尼斯高级技术有限公司 Gear box

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1202806A (en) * 1968-05-01 1970-08-19 Gemco Electric Co Gearing system
US4140026A (en) * 1977-02-25 1979-02-20 Rouverol William S Conformal gearing
GB1584391A (en) * 1977-02-02 1981-02-11 Imazaike M Gears
US4437356A (en) * 1980-03-22 1984-03-20 Mikiharu Imazaike Gear

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1202806A (en) * 1968-05-01 1970-08-19 Gemco Electric Co Gearing system
GB1584391A (en) * 1977-02-02 1981-02-11 Imazaike M Gears
US4140026A (en) * 1977-02-25 1979-02-20 Rouverol William S Conformal gearing
US4437356A (en) * 1980-03-22 1984-03-20 Mikiharu Imazaike Gear

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5636550A (en) * 1993-12-06 1997-06-10 Perkins Limited No-backlash gearing mechanism
US6047607A (en) * 1997-05-26 2000-04-11 Bayerische Motoren Werke Aktiengesellschaft Transmission gear wheel with damping capability
US6364781B2 (en) 1998-02-09 2002-04-02 Mannesmann Sachs Ag Installation apparatus for a coupling device having a holder, which is provided on a flywheel mass, for a driver
GB2352017A (en) * 1999-07-14 2001-01-17 Mannesmann Sachs Ag Coupling assembly
GB2352017B (en) * 1999-07-14 2004-02-04 Mannesmann Sachs Ag Clutch assembly
US6938747B2 (en) * 2001-04-11 2005-09-06 Volkswagen Ag Transmission with a rattle-free connection between the clutch basket and the driving disc
US6915892B2 (en) * 2002-06-15 2005-07-12 Borgwarner Inc. Driving plate for multi-plate clutch system
US6883656B2 (en) 2002-07-16 2005-04-26 Borgwarner, Inc. Driver unit for multi-disk clutch systems
DE20215041U1 (en) * 2002-09-26 2003-11-06 Brose Fahrzeugteile Gear element has body consisting at least partially of elastic material so that meshing elements on body are movable in relation to each other and consist of another more dimensionally stable material than elastic section of body
US7007783B2 (en) 2002-11-19 2006-03-07 Borgwarner Inc. Axially fixed and adjustable drive plate
DE102004037540A1 (en) * 2004-08-03 2006-03-16 Micromotion Gmbh Gearwheel for transmission, especially harmonic drive transmission, has at least one tooth space with at least one undercut, an undercut in region of tooth crown, or undercut may extend in body of tooth
DE102004037540B4 (en) * 2004-08-03 2008-05-29 Micromotion Gmbh Gear ring of a stress wave transmission
CN102966721A (en) * 2012-11-29 2013-03-13 四川大学 Filtering gear with high reliability and precision
CN102966703A (en) * 2012-11-29 2013-03-13 四川大学 Filtering reducer with high reliability and precision
CN105114598A (en) * 2015-09-25 2015-12-02 江苏太平洋齿轮传动有限公司 Relieving structure for bending stress of tooth roots of straight bevel gear
CN113811703A (en) * 2019-04-01 2021-12-17 詹尼斯高级技术有限公司 Gear box
US20220154804A1 (en) * 2019-04-01 2022-05-19 Genesis Advanced Technology Inc. Gearbox
DE102020201495A1 (en) 2020-02-07 2021-08-12 Zf Friedrichshafen Ag Gear, spur gear with this gear, as well as automatic gear with this spur gear

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Publication number Publication date
GB9303487D0 (en) 1993-04-07
GB9402496D0 (en) 1994-03-30

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