WO2016024997A1 - Engrenage en chevron - Google Patents

Engrenage en chevron Download PDF

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Publication number
WO2016024997A1
WO2016024997A1 PCT/US2014/051286 US2014051286W WO2016024997A1 WO 2016024997 A1 WO2016024997 A1 WO 2016024997A1 US 2014051286 W US2014051286 W US 2014051286W WO 2016024997 A1 WO2016024997 A1 WO 2016024997A1
Authority
WO
WIPO (PCT)
Prior art keywords
gear
bias
teeth
main
scissor
Prior art date
Application number
PCT/US2014/051286
Other languages
English (en)
Inventor
Nathaniel GORMAN
Paul A. Hayes
Original Assignee
Cummins Inc.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Cummins Inc. filed Critical Cummins Inc.
Priority to PCT/US2014/051286 priority Critical patent/WO2016024997A1/fr
Publication of WO2016024997A1 publication Critical patent/WO2016024997A1/fr

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
    • F16H55/17—Toothed wheels
    • F16H55/18—Special devices for taking up backlash

Definitions

  • the present invention relates to scissor gears, and more specifically to a scissor gear including a plurality of individual polymer plugs that bias a bias gear of the scissor gear toward a misaligned position relative to a main gear of the scissor gear.
  • Backlash may vary with a number of factors including radial play in the gear bearings, gear shaft eccentricity, incorrect center-to-center spacing of the gears, tolerance buildups and the gear-to-gear variation typical of many gear manufacturing processes.
  • the present disclosure provides a scissor gear, comprising a first gear having a plurality of circumferential teeth, a second gear attached to the first gear for rotation therewith about a common rotation axis, the second gear having a plurality of circumferential teeth, the second gear being movable about the rotation axis relative to the first gear between an aligned position, wherein the teeth of the second gear are aligned with the teeth of the first gear and a misaligned position, wherein the teeth of the second gear are misaligned with the teeth of the first gear, and a plurality of discrete polymer members disposed between the first gear and the second gear; each of the polymer members having a first engagement surface that engages a first surface of the first gear and a second engagement surface that engages a first surface of the second gear to exert a biasing force to rotate the second gear toward the misaligned position.
  • each of the polymer members has a first end facing the first gear, a second end facing the second gear, and a cylindrical body extending between the first end and the second end, the engagement surfaces being disposed on the cylindrical body.
  • the cylindrical body has a diameter when not under compression that is greater than a distance between the first surface of the first gear and the first surface of the second gear when the second gear is in the aligned position.
  • the first surface of the first gear is formed in a pocket extending into the first gear and the first surface of the second gear is formed on a tab extending from the second gear into the pocket of the first gear.
  • the scissor gear further comprises a plurality of cap screws, each cap screw having a threaded end that is threaded into a threaded bore formed in the first gear, a body that extends through a slotted opening formed in the second gear, and an enlarged diameter end that engages the second gear to inhibit movement of the second gear relative to the first gear along the rotation axis.
  • the scissor gear further comprises a pin configured to extend through an alignment opening formed in the second gear into an alignment opening formed in the first gear to retain the second gear in the aligned position against the biasing force of the polymer members during installation of the scissor gear.
  • removal of the pin permits the biasing force of the polymer members to rotate the second gear toward the misaligned position.
  • each polymer member is injected with the second gear in the misaligned position, through a port formed through the second gear into a pocket formed in the first gear.
  • each polymer member is injected, with the second gear in the misaligned position, through the port formed through the second gear and through a port formed through the first gear into the pocket formed in the first gear.
  • the ports of the first and second gears are frustoconical, having a diameter that increases with distance away from the pocket of the first gear, the polymer member extending into the ports to inhibit movement of the second gear relative to the first gear along the rotation axis.
  • each polymer member is formed from FKM rubber.
  • a gear assembly comprising a main gear having teeth extending radially from a circumferential edge of a body of the main gear, a bias gear having a teeth extending radially from a circumferential edge of a body of the bias gear, the bias gear being movable relative to the main gear about a common rotation axis between an aligned position, wherein the bias gear teeth are aligned with the main gear teeth, and a misaligned position, wherein the bias gear teeth are rotated about the rotation axis relative to the main gear teeth, and a plurality of discrete, polymer plugs retained in compression between the main gear and the bias gear, expansion of the plugs biasing the bias gear to rotate about the rotation axis toward the misaligned position.
  • each plug has a first engagement surface that engages a first surface of the main gear and a second engagement surface that engages a first surface of the bias gear.
  • the first surface of the main gear is formed in a pocket extending into the main gear and the first surface of the bias gear is formed on a tab extending from the bias gear into the pocket of the main gear.
  • each polymer plug is injected, with the bias gear in the misaligned position, through a port formed through the bias gear into a pocket formed in the main gear.
  • the polymer plugs are formed from FKM rubber.
  • a method of assembling a scissor gear comprising inserting a plurality of individual polymer plugs into a corresponding plurality of pockets of a main gear, installing a bias gear onto the main gear such that a plurality of tabs of the bias gear extend into the corresponding plurality of pockets and engage the plurality of plugs, and installing a plurality of cap screws into the main gear to retain the bias gear onto the main gear.
  • inserting the plurality of individual polymer plugs includes injecting polymer material into the corresponding plurality of pockets through a plurality of ports extending through the bias gear.
  • a variant of this aspect further comprises rotating the bias gear relative to the main gear until teeth of the bias gear are aligned with teeth of the main gear, thereby compressing the plugs, and installing a pin into an alignment opening in the main gear to maintain the teeth of the bias gear in alignment with the teeth of the main gear.
  • Another variant further comprises stamping the bias gear to form the plurality of tabs.
  • FIG. 1(A) is a partial side view of a drive gear and a prior art driven gear in meshing engagement
  • FIG. 1(B) is a partial side view of a drive gear and a driven gear according to one embodiment of the present disclosure in meshing engagement;
  • FIG. 2 is an exploded, perspective view of a scissor gear according to one embodiment of the present disclosure
  • FIG. 3 is a partial, perspective view of the bias gear depicted in FIG. 2;
  • FIG. 4 is a perspective view of a plug depicted in FIG. 2;
  • FIG. 5 is a partial, cross-sectional view of the scissor gear depicted in FIG. 2;
  • FIG. 6 is a partial, side view of the scissor gear depicted in FIG. 2 in a misaligned position
  • FIG. 7 is a partial, side view of the scissor gear depicted in FIG. 2 in an aligned position
  • FIGS 8(A)-(B) are perspective views of an alternate embodiment of a bias gear according to the present disclosure.
  • FIGS. 9 and 10 are exploded, perspective views of a scissor gear according to another embodiment of the present disclosure.
  • FIG. 11 is a partial, side view of the scissor gear depicted in FIGS. 9 and 10;
  • FIG. 12 is a partial, side sectional view of the scissor gear depicted in FIGS. 9 and
  • FIG. 13 is a partial, side sectional view of an alternate embodiment of the scissor gear depicted in FIGS. 9 and 10; and [0026] FIG. 14 is a partial, side sectional view of another alternate embodiment of the scissor gear depicted in FIGS. 9 and 10.
  • FIG. 1(A) depicts the interaction between a prior art crank or drive gear and a cam or driven gear.
  • drive gear 100 rotates in a clockwise direction to force driven gear 102 in a counter-clockwise direction.
  • a build-up of tolerances and other factors generally result in an imperfect match between the teeth 104 of drive gear 100 and the teeth 106 of driven gear 102.
  • undesirable lash 108 or slop exists between gears 100, 102, which may result in excessive noise, wear, and other undesirable performance characteristics.
  • driven gear 102 it is desirable to bias a portion of driven gear 102 in a counter-clockwise direction to reduce or eliminate the mismatch between teeth 104 of drive gear 100 and teeth 106 of driven gear 102.
  • driven gear 102 configuring driven gear 102 to include a main gear 110, a bias gear 112, and a plurality of polymer elements which bias the bias gear 112 in the counter-clockwise direction as viewed in FIG. 1(B) and described below.
  • Scissor gear 200 generally includes a main gear 210, a bias gear 212, and a plurality of individual or discrete polymer members or plugs 214.
  • Main gear 210 includes a hub 216 which is central to the disk-shaped gear, a body 218 extending radially from hub 216, and a plurality of circumferential teeth 220 extending radially from body 218.
  • a surface 222 of body 218 faces bias gear 212 and includes a plurality of pockets 224 formed therein as is further described below.
  • main gear 210 further includes threaded bores 226 (three shown) configured to receive cap screws 228 and an alignment opening 230 configured to receive a retaining pin 232 as is further described below.
  • bias gear 212 generally includes a central opening 234, a body 236 extending radially from central opening 234, and a plurality of circumferential teeth 238 extending radially from body 236.
  • a surface 240 (FIG. 3) of body 236 faces main gear 210 and includes a plurality of tabs 242 extending perpendicularly therefrom.
  • Bias gear 212 also includes retaining tabs 244 (three shown) which project from body 236 into central opening 234 and are configured to cooperate with cap screws 228 in the manner described below. Bias gear 212 further includes a projection 246 which cooperates with pin 232 to maintain bias gear 212 in a misaligned position as described below. Finally, bias gear 212 also includes a plurality of holes 248 which serve to reduce the area of surface 240 and permit access to pockets 224 of main gear 210.
  • plugs 214 each include a first end 250, a second end
  • body 254 includes engagement surfaces which, when plug 214 is under compression and in position in scissor gear 200, transmit a biasing force to rotate bias gear 212 relative to main gear 210.
  • Scissor gear 200 is assembled by installing plugs 214 into pockets 224 of main gear 210, then placing bias gear 212 onto main gear 210 such that tabs 242 are located in pockets 224 adjacent plugs 214. After bias gear 212 is placed onto main gear 210, cap screws 228 are placed threaded into bores 226 of main gear 210 such that the heads of cap screws 228 engage retaining tabs 244. As is further described below, cap screws 228 are configured to retain bias gear 212 onto main gear 210 while permitting rotational movement of bias gear 212 relative to main gear 210.
  • bias gear 212 is rotated relative to main gear 210 (compressing plugs 214 between tabs 242 and a surface of pockets 224) until projection 246 of bias gear 212 is aligned with alignment opening 230 of main gear 210.
  • pin 232 is inserted into opening 230, and rotation of bias gear 212 as a result of the biasing force of plugs 214 is prevented by the interference between pin 232 and projection 246. This alignment is described further below with reference to FIGS. 6 and 7.
  • Fig. 5 depicts one embodiment of a cap screw 228 configuration.
  • cap screw 228 includes a threaded portion 258, a shoulder portion 260 and a tapered head 262.
  • threaded portion 258 is fully threaded into bore 226 until shoulder portion 260 engages surface 222 of main gear 210.
  • cap screw 228 is situated within a slotted opening 245 of bias gear 212 such that it prevents bias gear 212 from moving in the direction of arrow A away from main gear 210.
  • bias gear 211 can rotate (into and out of the page as viewed in FIG. 5) relative to main gear 210.
  • main gear 210 and bias gear 212 when assembled, rotate about a common rotation axis 264 (FIG. 2) extending through hub 216 of main gear 210 and central opening 234 of bias gear 212.
  • bias gear 212 is rotated relative to main gear 210 in a direction opposite to the common rotation of main gear 210 and bias gear 212 about axis 264. This reverse rotation of bias gear 212 is caused by plugs 214 expanding from a compressed state as described below.
  • scissor gear 200 is shown fully assembled but in a misaligned position.
  • plugs 214 have expanded to a substantially uncompressed state, urging tabs 242 (and therefore bias gear 212) in a counter-clockwise direction as viewed in the figure. More specifically, as plugs 214 expand, an engagement surface 266 of plug body 254 engages a surface 268 of pocket 224 and an opposite engagement surface 270 of body 254 engages a surface 272 of tab 242.
  • teeth 238 of bias gear 212 are not aligned with teeth 220 of main gear 210. Additionally, alignment opening 230 of main gear 210 is not aligned with protrusion 246 of bias gear 212.
  • bias gear 212 is rotated clockwise relative to main gear 210 into an aligned position as shown in FIG. 7.
  • teeth 238 of bias gear 212 are aligned with teeth 220 of main gear 210.
  • protrusion 246 of bias gear 212 has rotated past alignment opening 230 of main gear 210.
  • pin 232 may be inserted into alignment openings 230 to retain bias gear 212 in the aligned position (i.e., to prevent plugs 214 from causing rotation of bias gear 212 about rotation axis 264 toward the misaligned position).
  • Scissor gear 200 may then be installed into meshing engagement with drive gear
  • FIG. 1(A) when bias gear 212 is in the aligned position (FIG. 7), lash 108 is not prevented. However, when pin 232 is removed after installation, the biasing force of plugs 214 as they expand from their compressed state is released, causing bias gear 212 to rotate toward the misaligned position (FIG. 6). This causes bias gear 212 to rotate as depicted in FIG. 1(B), which reduces lash 108 between scissor gear 200 and drive gear 100. [0039] An alternate embodiment of a bias gear is depicted in FIGS. 8(A) and 8(B).
  • bias gear 800 is stamped from a piece of material forming the bias gear 800.
  • Bias gear 800 generally includes a central opening 234, a body 236 extending radially from central opening 234, and a plurality of circumferential teeth 238 extending radially from body 236.
  • a surface 240 (FIG. 8(B)) of body 236 faces main gear 210 and includes a plurality of tabs 802 extending perpendicularly therefrom.
  • Bias gear 800 also includes slotted openings 844 (three shown) configured to receive cap screws 228 in the manner described above with reference to FIG. 5, and an alignment opening 846 configured to receive cooperate with pin 232 to retain bias gear 800 in the aligned position in the manner described above with reference to protrusion 246 of bias gear 212.
  • Tabs 802 are formed by a stamping process such that voids 804 are created as the material for tabs 802 is moved into a substantially perpendicular orientation relative to body 236 of bias gear 800.
  • Each tab 802 includes a surface 806 that engages engagement surface 270 of plug body 254 in the manner described above.
  • Bias gear 800 of this embodiment is positioned relative to main gear 210 in the manner described above and the surface 240 of tabs 802 receives the biasing force of plugs 214 in the manner described above.
  • scissor gear 900 includes a main gear 902 having pockets 904 formed therein, a bias gear 906 that is coupled to main gear 902 using cap screws 908 in the manner described above, and a plurality of injected polymer members 910 (FIG. 12) formed within pockets 904 by injecting polymer material through ports 911 formed in bias gear 906. More specifically, as best shown in FIG. 10, bias gear 906 includes injection ports 911 which are located adjacent tabs 912, which upon assembly of scissor gear 900, extend from bias gear 906 into pockets 904 of main gear 902.
  • bias gear 906 may be moved to the aligned position described above and retained there using a pin (not shown) or some other means to place the polymer members 910 in a state of compression. Then, after scissor gear 900 is installed onto drive gear 100 in the manner described above, the pin may be removed to permit polymer members 910 to apply biasing force against tabs 912 of bias gear 906 to move bias gear 906 toward the misaligned position, thereby reducing or eliminating lash 108 as described above.
  • 910 may be implemented, as an alternative to plugs 214, using either bias gear 212 of FIG. 2 or bias gear 800 of FIGS. 8(A)-(B).
  • FIGS. 11 and 12 depict the injection of polymer members 910 through ports 911 of bias gear 906. As shown, when placed under rotational compression, polymer members 910 exert a biasing force on tabs 912 of bias gear 906 to reduce or eliminate the lash 108 described above.
  • the polymer material is injected through ports 911 of bias gear 906 and ports 914 formed in main gear 902.
  • a sufficient amount of polymer material is injected to substantially fill ports 911, 914 and cure in place.
  • the polymer material in this embodiment may eliminate the need for cap screws 908, as the frustoconical shape of ports 911, 914 permits the polymer material, once cured, to retain bias gear 906 adjacent main gear 902, thereby preventing movement of bias gear 906 along rotation axis 264 (FIG. 2) away from main gear 902.
  • FIG. 14 depicts an alternate embodiment of bias gear 906 of FIG. 13. Bias gear
  • Extensions 916 include a first segment 918 connected to bias gear 906 and a second segment 920 extending from first segment 918 at an angle of, for example, 90 degrees or substantially perpendicular to first segment 918. Extensions 916 are provided to permit increased adhesion of polymer member 910 to bias gear 906, thereby enhancing the ability of polymer member 910 to prevent movement of bias gear 906 along rotation axis 264.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gears, Cams (AREA)

Abstract

L'invention porte sur un engrenage en chevron, qui comprend un premier engrenage ayant une pluralité de dents périphériques, un second engrenage fixé au premier engrenage pour une rotation avec ce dernier autour d'un axe de rotation commun, le second engrenage étant mobile autour de l'axe de rotation par rapport au premier engrenage entre une position alignée, dans laquelle les dents du second engrenage sont alignées avec les dents du premier engrenage, et une position non alignée, dans laquelle les dents du second engrenage ne sont pas alignées avec les dents du premier engrenage, et une pluralité d'éléments individuels en polymère ayant chacun une première surface de prise qui vient en prise avec une première surface du premier engrenage et une seconde surface de prise qui vient en prise avec une première surface du second engrenage, de façon à exercer une force de sollicitation pour faire tourner le second engrenage vers la position non alignée.
PCT/US2014/051286 2014-08-15 2014-08-15 Engrenage en chevron WO2016024997A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US2014/051286 WO2016024997A1 (fr) 2014-08-15 2014-08-15 Engrenage en chevron

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2014/051286 WO2016024997A1 (fr) 2014-08-15 2014-08-15 Engrenage en chevron

Publications (1)

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WO2016024997A1 true WO2016024997A1 (fr) 2016-02-18

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PCT/US2014/051286 WO2016024997A1 (fr) 2014-08-15 2014-08-15 Engrenage en chevron

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018008344A1 (fr) * 2016-07-04 2018-01-11 アイマー・プランニング株式会社 Machine à imprimer pourvue d'un dispositif d'entraînement de cylindre porte-plaque
WO2022087555A1 (fr) * 2020-10-21 2022-04-28 Cummins Inc. Engrenage en ciseaux anti-jeu centrifuge

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3127784A (en) * 1963-01-29 1964-04-07 Robert F O'neill Anti-backlash gears
US4660432A (en) * 1984-07-05 1987-04-28 James Damas Device for automatically taking up backlash in gear transmission systems
GB2409014A (en) * 2003-12-08 2005-06-15 Cnh Uk Ltd Anti-backlash gear assembly
WO2005090829A1 (fr) * 2004-03-22 2005-09-29 Miba Sinter Austria Gmbh Roue dentee pour etage de pignons cylindriques sans jeu
KR20060064705A (ko) * 2004-12-09 2006-06-14 현대자동차주식회사 백래시 방지용 보조기어가 장착된 기어장치
EP2228564A1 (fr) * 2009-03-09 2010-09-15 Metallumform Gmbh Roue dentée à compensation de jeu comprenant une roue dentée auxiliaire soutenue élastiquement sur une roue dentée principale transmettant le couple

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3127784A (en) * 1963-01-29 1964-04-07 Robert F O'neill Anti-backlash gears
US4660432A (en) * 1984-07-05 1987-04-28 James Damas Device for automatically taking up backlash in gear transmission systems
GB2409014A (en) * 2003-12-08 2005-06-15 Cnh Uk Ltd Anti-backlash gear assembly
WO2005090829A1 (fr) * 2004-03-22 2005-09-29 Miba Sinter Austria Gmbh Roue dentee pour etage de pignons cylindriques sans jeu
KR20060064705A (ko) * 2004-12-09 2006-06-14 현대자동차주식회사 백래시 방지용 보조기어가 장착된 기어장치
EP2228564A1 (fr) * 2009-03-09 2010-09-15 Metallumform Gmbh Roue dentée à compensation de jeu comprenant une roue dentée auxiliaire soutenue élastiquement sur une roue dentée principale transmettant le couple

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018008344A1 (fr) * 2016-07-04 2018-01-11 アイマー・プランニング株式会社 Machine à imprimer pourvue d'un dispositif d'entraînement de cylindre porte-plaque
EP3480014A4 (fr) * 2016-07-04 2020-03-11 I. Mer Co., Ltd. Machine à imprimer pourvue d'un dispositif d'entraînement de cylindre porte-plaque
US11046067B2 (en) 2016-07-04 2021-06-29 I.Mer Co., Ltd. Printing machine provided with plate cylinder driving device
WO2022087555A1 (fr) * 2020-10-21 2022-04-28 Cummins Inc. Engrenage en ciseaux anti-jeu centrifuge

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