US3729967A - Apparatus and method of finishing gear teeth - Google Patents

Apparatus and method of finishing gear teeth Download PDF

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Publication number
US3729967A
US3729967A US00141708A US3729967DA US3729967A US 3729967 A US3729967 A US 3729967A US 00141708 A US00141708 A US 00141708A US 3729967D A US3729967D A US 3729967DA US 3729967 A US3729967 A US 3729967A
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US
United States
Prior art keywords
teeth
gear
chamfering
gears
guide
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.)
Expired - Lifetime
Application number
US00141708A
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English (en)
Inventor
O Bauknecht
A Hurl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZF Friedrichshafen AG
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ZF Friedrichshafen AG
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Filing date
Publication date
Priority claimed from DE19702022937 external-priority patent/DE2022937C/de
Application filed by ZF Friedrichshafen AG filed Critical ZF Friedrichshafen AG
Application granted granted Critical
Publication of US3729967A publication Critical patent/US3729967A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23F—MAKING GEARS OR TOOTHED RACKS
    • B23F19/00—Finishing gear teeth by other tools than those used for manufacturing gear teeth
    • B23F19/10—Chamfering the end edges of gear teeth
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49462—Gear making
    • Y10T29/49467—Gear shaping
    • Y10T29/49471—Roll forming
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T409/00—Gear cutting, milling, or planing
    • Y10T409/10—Gear cutting
    • Y10T409/101113—Gear chamfering or deburring
    • Y10T409/101272—Using relatively reciprocating or oscillating cutter

Definitions

  • Rolled or machine-cut gears are finished by a rolling I action in engagement with a die roll comprising a Foreign pp Priority Data guide gear intermediate a pair of side gears.
  • the outer May 12 1970 Germany ..P 20 22 937.2 gears form chamfers the 00th edges While the guide gear, when working without flank clearance n7 2 A against the work gear, prevents flank bulging and efi 2/10 i fects smoothing.
  • the teeth of the work gear are submain 29/159 2 stantially confined by the teeth of the three gears of 29/96 H 901' the die roll to prevent bulging of material due to the effect of chamfering as well as effecting burr trimming and smoothing.
  • Another machine for chamfering and deburring heretofore known dispenses with the guide gear but requires a separate motor for the work gear and for the chamfering and deburring gears.
  • the chamfer angle must be limited to 35 to avoid bulging of material at the teeth flanks. Also, to maintain a certain width of chamfer, the rolling time must be limited. For the operation, special instrumentation is required.
  • Another machine for the purpose combines a motordriven shaving gear with a guide gear both gears meshing with the work gear.
  • the shaving gear removes bulged material affected by the chamfering action.
  • the present invention avoids the drawbacks of the prior art by providing a composite die roll comprising a guide gear for meshing with teeth of a work gear to be finished and also comprising a chamfering gear on each side of said guide gear and secured thereto and having tooth ends at respective tooth ends of said guide gear with chamfering surfaces at an obtuse angle to said respective. ends, whereby chamfering of tooth corners of said work gear is simultaneously effected by said chamfering surfaces when said die roll is rotated and by providing means for forcing said die roll into a relative radial movement towards said work gear, and wherein the teeth of said guide gear are formed to mesh with the teeth of said work gear fully across the flanks thereof and with zero flank clearance at the end of said radial movement.
  • a further embodiment of the invention provides a die roll with a guide gear the flanks of which are formed in such a manner and a predetermined force being applied to radially move said die roll towards said work and press the meshing flanks together such that the flanks of said work are simultaneously smoothed while respective tooth corners are being chamfered.
  • the invention is applicable to various types of gears, as will be described, and in a simple apparatus wherein the work gear is motor driven while the die roll is freely rotative and moved against the work gear by hydraulic power. Also, the invention is applicable to formed gear blanks not necessarily prepared by a rolling process but by means of milling, shaping, etc., wherein the invention is capable of a complete finishing operation.
  • flanks of a guide gear intended to smooth the flanks of the work gear can be performed with a profile modification to anticipate a distortion occuring after heat treatment of the finished gears.
  • rotational direction may be changed one or more times in order to yield the highest surface quality and dimensional precision.
  • contact pressure between the work gear and the die roll can be predeterminedly varied to achieve different effects for clockwise and counterclockwise rotation.
  • FIG. 1 is a fragmentary view of the meeting engagement of teeth of a work gear shown in section with teeth of a composite die roll showing the guide gear and the chamfer forming gears at the sides thereof, oriented at obtuse angles, the illustration being'for helical teeth, the presentation of FIG. 1 being illustrative generally of a section on the line A-A of FIG. 4;
  • FIG. 2 is a view similar to FIG. 1 except that the chamfering die roll gears have teeth which are aligned with the teeth of the intermediate guide gear;
  • FIG. 3 is similar to the view of FIG. 2 except that the work gear has no helical tooth angle;
  • FIG. 4 shows in longitudinal section the essentials of an apparatus for carrying out the method of the invention
  • FIG. 5 is a view similar to FIG. 2, except that all edges of helicoidal work gear teeth are chamfered.
  • a work gear to be finished is comprised of teeth 2 which will be understood to be in full mesh with teeth 1 of an intermediate gear of a composite die roll which intermediate gear is a guide gear and is rotated by the work gear, having zero flank clearance therewith.
  • the die roll also comprises side or chamfering gears having respective teeth 3 and 4.
  • the composite die roll is driven radially by hydraulic power into mesh with the power rotated work gear, as will be more clearly understood from FIG. 4.
  • the chamfering gears comprising teeth 3 and 4 are securely festened to the guide gear as shown in FIG. 4, and the chamfering teeth are at a helical angle [3' with the die roll axis.
  • the helical angle of the work gear teeth is shown as B. These angles may or may not be equal, but in any event the angles between teeth 1 and 3, and teeth 1 and 4 are obtuse, as shown on FIG. 1. 7
  • teeth 2 of the work gear are slightly greater in width than the width of the guide gear teeth 1 .of the die roll to permit entry of the lateral ends of the chamfering teeth between work gear teeth.
  • chamfering gears of a helix angle equal to that of the guide gear so as to chamfer the two other diagonally related corners of the work gear as described in detail in connection with FIG. 2 and FIG. 3.
  • the chamfering gears are removable from the guide gear so that another pair of chamfering gears can be attached to the guide gear, as will be apparent from the showing in FIG. 4 for the chamfering gears 37 and 38 secured to guide gear 36 as by screws and pins.
  • the die roll guide gear teeth 11 are shown on opposite sides of a work gear tooth 12, as in FIG. 1, except that the chamfering teeth 13 and 14 are now aligned contiguously with respective guide gear teeth 11, and have obtuse angle chamfer surfaces circumferentially offset from the respective guide gear teeth.
  • the edges or corners of the teeth 13 and 14 are chamfered as at 15 and 16 and offset is effected by making the chamfer gear teeth thicker than the guide gear teeth. Accordingly, although the angle ,8 is the same for all teeth, rotation and relative radial motion will cause chamfering of the work gear teeth at both acute-angled flank edges diagonally opposed to each other.
  • the chamfering of the work gear teeth is due to the fact that the teeth 13'and 14 are somewhat thicker than the teeth 11 and the flank of each tooth 13 is accordingly circumferentially offset, i.e., extending beyond the corresponding flank of respective tooth 11. There is an offset in the opposite direction between teeth 11 and 14.
  • the increased flank thickness extending in opposite direction between teeth 13 and 14 with respect to the teeth 11 provides for the chamfering engagement as will be apparent from FIG. 2.
  • the method is used for straight teeth, all four corners 25 of work gear teeth 22-being chamfered simultaneously.
  • the edges 25 of the chamfering die roll teeth 23 and 24 which face the work gear teeth 22 are all chamfered uniformly at an obtuse angle 'to the tooth flanks.
  • the chamfer gear teeth are thicker and symmetrically disposed with respect to the guide gear teeth 21 intermediate respective pairs of chamfer die roll teeth 23 and 24. It will thus be apparent that if the work gear and die roll are forced into meshing engagement and simultaneously rotated that all four chamfers 25' will be formed at the same time and in the same direction of rotation, although reverse rotation for flank smoothing by the guide gear may be had.
  • the apparatus depicted comprises a base on which is carried a work gear 31 of width b which will be understood to have a claw-type ring 32 for keyed engagement with a hub 33 on a supporting flange 35 carried on the base and rotated as by a motor driven shaft 43.
  • Work gear 31 can be secured by a screw 34.
  • a slideable carriage 40 Carried on the base is a slideable carriage 40 in rails 39, reversibly actuated by a piston rod 41 powered by double ended hydraulic cylinder 42.
  • the die roll comprising guide gear 36 and side gears 37 and 38 will be understood to be a composite and integral assembly freely rotative on carriage 40.
  • the width b of the work gear is always somewhat greater than the width of the guide gear teeth 36 in order to allow space for the action of the chamfering die rolls.
  • chamfering and deburring is effected by the chamfering die rolls and any bulging of material which might move by plastic flow to the flanks of the work gear teeth in the vicinity of the chamfering is smoothed out by the action of the guide gear die roll. This is achieved by providing a zero flank clearance between the teeth of the work gear and the guide gear die roll in all embodiments of the invention.
  • the confining effect of the arrangement of the composite die roll controls the flow of metal in the course of the chamfering operation so that the finished product needs no further machine processing.
  • a die roll for finishing gears comprising a guide gear having teeth for meshing with teeth of a work gear to be finished and said guide gear teeth being smaller in width than said work gear teeth; said die roll also comprising a chamfering gear secured on each side of said guide gear and having chamfering teeth of greater thickness than said guide gear teeth and abutting respective teeth thereof to effect circumferential offset from the tooth flanks thereof; the teeth of said guide and chamfering gears being at the same helical angle; chamfered surfaces on the teeth of said chamfering gears at an obtuse angle to the helical angle of the guide gear teeth at respective ends thereof; whereby said chamfered surfaces engage the corners ofsaid work gear teeth for chamfering corners simultaneously at both ends thereof as said die roll is rotated and moved radially into mesh with said work gear.
  • a die roll as set forth in claim l said chamfering surfaces extending from the circumferentially offset flanks of said chamfering gears to the corners of the flanks of respective abutting guide gear teeth.
  • a die roll for finishing gears comprising a guide gear having teeth for meshing with teeth of a work gear to be finished and said guide gear teeth being substantially the width of the working flanks of said work gear teeth; said die roll also comprising a chamfering gear secured on each side of said guide gear and having chamfering teeth of greater thickness than said guide gear teeth and abutting respective teeth thereof to effeet circumferential offset from the tooth flanks thereof; the teeth of said guide and chamfering gears being at the same helical angle; chamfered surfaces on the teeth of said chamfering gears at an obtuse angle to the helical angle of the guide gear teeth at respective ends thereof; whereby said chamfered surfaces engage the corners of said work gear teeth.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gear Processing (AREA)
US00141708A 1970-05-12 1971-05-10 Apparatus and method of finishing gear teeth Expired - Lifetime US3729967A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702022937 DE2022937C (de) 1970-05-12 Vorrichtung zum spanlosen Abschra gen der Stirnkanten von Zahnradern

Publications (1)

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US3729967A true US3729967A (en) 1973-05-01

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US00141708A Expired - Lifetime US3729967A (en) 1970-05-12 1971-05-10 Apparatus and method of finishing gear teeth

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US (1) US3729967A (enrdf_load_stackoverflow)
CH (1) CH539484A (enrdf_load_stackoverflow)
FR (1) FR2091329A5 (enrdf_load_stackoverflow)
GB (1) GB1330912A (enrdf_load_stackoverflow)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2389443A1 (enrdf_load_stackoverflow) * 1977-05-03 1978-12-01 Samputensili Spa
US4334810A (en) * 1979-02-08 1982-06-15 Carl Hurth Maschinen- Und Zahnradfabrik Gmbh & Co. Gear deburring apparatus and method
US4690009A (en) * 1985-11-29 1987-09-01 Reliance Electric Company Method and apparatus for producing pseudo - herringbone-type gears and gear produced thereby
US5930896A (en) * 1996-03-15 1999-08-03 Nissan Motor Co., Ltd. Apparatus and method for forming a gear
US6016602A (en) * 1996-03-01 2000-01-25 Kabushiki Kaisha Kanemitsu Method of producing a sheet metal gear
US6050755A (en) * 1997-08-22 2000-04-18 The Gleason Works Apparatus for chamfering and deburring gear tooth end edges
US20020197121A1 (en) * 2001-06-21 2002-12-26 Johann Mall Machine for deburring and fine machining of tooth flanks of toothed workpieces
US20030167813A1 (en) * 2001-06-21 2003-09-11 Toshinaka Shinbutsu Method of rolling worm gear and the worm gear
US20090241711A1 (en) * 2008-03-28 2009-10-01 Aisin Ai Co., Ltd Helical gear and method of manufacturing the same
CN108581084A (zh) * 2018-06-05 2018-09-28 江阴市工具厂 一种用于齿轮倒棱及滚压的复合刀具

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3735619A (en) * 1972-01-27 1973-05-29 Lear Siegler Inc Gear roll chamfering
IT1309965B1 (it) * 1999-04-09 2002-02-05 Samputensili Spa Metodo si smussatura e sbavatura di denti di ruote dentate,dispositivo per l'attuazione di tale metodo e relativo utensile

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2271759A (en) * 1935-04-10 1942-02-03 Packard Motor Car Co Method of processing gears
US3590619A (en) * 1968-07-19 1971-07-06 Landis Machine Co Manufacture of herringbone gears

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2271759A (en) * 1935-04-10 1942-02-03 Packard Motor Car Co Method of processing gears
US3590619A (en) * 1968-07-19 1971-07-06 Landis Machine Co Manufacture of herringbone gears

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2389443A1 (enrdf_load_stackoverflow) * 1977-05-03 1978-12-01 Samputensili Spa
US4290718A (en) * 1977-05-03 1981-09-22 Samputensili S.P.A. Tools for bevelling and deburring gears
US4334810A (en) * 1979-02-08 1982-06-15 Carl Hurth Maschinen- Und Zahnradfabrik Gmbh & Co. Gear deburring apparatus and method
US4690009A (en) * 1985-11-29 1987-09-01 Reliance Electric Company Method and apparatus for producing pseudo - herringbone-type gears and gear produced thereby
US6016602A (en) * 1996-03-01 2000-01-25 Kabushiki Kaisha Kanemitsu Method of producing a sheet metal gear
US5930896A (en) * 1996-03-15 1999-08-03 Nissan Motor Co., Ltd. Apparatus and method for forming a gear
US6050755A (en) * 1997-08-22 2000-04-18 The Gleason Works Apparatus for chamfering and deburring gear tooth end edges
US20020197121A1 (en) * 2001-06-21 2002-12-26 Johann Mall Machine for deburring and fine machining of tooth flanks of toothed workpieces
US20030167813A1 (en) * 2001-06-21 2003-09-11 Toshinaka Shinbutsu Method of rolling worm gear and the worm gear
US6840720B2 (en) * 2001-06-21 2005-01-11 The Gleason Works Machine for deburring and fine machining of tooth flanks of toothed workpieces
US6915673B2 (en) * 2001-06-21 2005-07-12 Nissei Co., Ltd. Method of rolling worm gear and the worm gear
US20090241711A1 (en) * 2008-03-28 2009-10-01 Aisin Ai Co., Ltd Helical gear and method of manufacturing the same
US8910381B2 (en) 2008-03-28 2014-12-16 Aisin Ai Co., Ltd. Helical gear and method of manufacturing the same
CN108581084A (zh) * 2018-06-05 2018-09-28 江阴市工具厂 一种用于齿轮倒棱及滚压的复合刀具
CN108581084B (zh) * 2018-06-05 2024-02-06 江阴塞特精密工具有限公司 一种用于齿轮倒棱及滚压的复合刀具

Also Published As

Publication number Publication date
FR2091329A5 (enrdf_load_stackoverflow) 1972-01-14
DE2022937A1 (de) 1971-11-25
GB1330912A (en) 1973-09-19
CH539484A (de) 1973-07-31
DE2022937B2 (de) 1973-01-04

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