WO1991002201A1 - A machine for chamfering the sharp edges of the teeth of annular gears - Google Patents

A machine for chamfering the sharp edges of the teeth of annular gears Download PDF

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Publication number
WO1991002201A1
WO1991002201A1 PCT/EP1990/001238 EP9001238W WO9102201A1 WO 1991002201 A1 WO1991002201 A1 WO 1991002201A1 EP 9001238 W EP9001238 W EP 9001238W WO 9102201 A1 WO9102201 A1 WO 9102201A1
Authority
WO
WIPO (PCT)
Prior art keywords
gear
worked
gears
cradle
machine according
Prior art date
Application number
PCT/EP1990/001238
Other languages
English (en)
French (fr)
Inventor
Bruno Olocco
Gianfranco Pallai
Original Assignee
Bocca & Malandrone Di Malandrone & C. S.A.S.
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 Bocca & Malandrone Di Malandrone & C. S.A.S. filed Critical Bocca & Malandrone Di Malandrone & C. S.A.S.
Publication of WO1991002201A1 publication Critical patent/WO1991002201A1/en

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23FMAKING GEARS OR TOOTHED RACKS
    • B23F19/00Finishing gear teeth by other tools than those used for manufacturing gear teeth
    • B23F19/10Chamfering the end edges of gear teeth
    • B23F19/102Chamfering the end edges of gear teeth by milling
    • B23F19/104Chamfering the end edges of gear teeth by milling the tool being a hob
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23FMAKING GEARS OR TOOTHED RACKS
    • B23F23/00Accessories or equipment combined with or arranged in, or specially designed to form part of, gear-cutting machines
    • B23F23/02Loading, unloading or chucking arrangements for workpieces
    • B23F23/04Loading or unloading arrangements
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23FMAKING GEARS OR TOOTHED RACKS
    • B23F23/00Accessories or equipment combined with or arranged in, or specially designed to form part of, gear-cutting machines
    • B23F23/02Loading, unloading or chucking arrangements for workpieces
    • B23F23/06Chucking arrangements
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23FMAKING GEARS OR TOOTHED RACKS
    • B23F23/00Accessories or equipment combined with or arranged in, or specially designed to form part of, gear-cutting machines
    • B23F23/08Index mechanisms
    • B23F23/085Index mechanisms of the continuous type

Definitions

  • the present invention relates to a machine for chamfering the sharp edges of the teeth of annular gears according to the pre.amble of Claim 1.
  • the gear to be worked is supported by support means, generally in the form of a shaft or mandrel which is rotated in steps, the number of steps being the same as the number of teeth.
  • the chamfering tool is a rotary grinder which is supported by an oscillating element and which, between each step in the rotation of the gear, is brought into engagement with the sharp edge which is situated in correspondence with the grinder for chamfering at that time.
  • a more serious problem is the fact that chamfering with a grinder produces an abrasive sludge which not only cannot be recovered for any useful purpose, but is also a pollutant.
  • the object of the present invention is to provide a machine which does not have these disadvantages.
  • the sharp edges are chamfered continuously which achieves operating rates many times faster than those which can be achieved by grinding machines. Moreover, the chamfering takes place by the removal of chips and the steel chippings formed are. a 'valuable material which can be resold to steel-works at quite a high price.
  • the machine according to the invention has been designed to chamfer the sharp edges of teeth of gears with helical teeth but it can also be applied to spur gears.
  • Figure 1 is a partial perspective view showing a gear with helical teeth and a hob meshed with the gear for chamfering the edges of the teeth.
  • Figure 2 is a plan view of a preferred embodiment of the machine according to the invention.
  • Figure 3 is a side elevation thereof taken on the arrow III of Figure 2,
  • Figure 4 is a perspective view showing a transmission system which forms part of the machine.
  • FIG. 5 is a detailed perspective view showing a loading device which forms part of the machine.
  • FIG 6 is a perspective view showing an unloading device which forms part of the machine.
  • an annular gear with helical teeth 12 is indicated 10.
  • the gear 10 has a central keying bore 14 which opens into its two opposite faces.
  • the chamfers of the sharp edges corresponding to the intersections of the sides of the teeth 12 with each face of the gear 10 are chamfered as shown at 16.
  • the chamfers 16 on each face of the gear 10 are produced by means of a chamfering tool constituted by a hob 18.
  • the hob 18 is a mill, similar to a worm screw, with a thread or worm 20 which is cut so that it has cutting edges 22 for forming the chamfers 16 by removing chips.
  • a machine according to the invention comprises a strong bed 24 with a horizontal table 26 on which the main components of the machine are mounted.
  • the machine includes a head 28 and a counter-head 30 mounted on respective supports 32, 34 fixed to the table 26.
  • the head 28 and the counter-head 30 carry respective pins 36, 38 which constitute support means for the gear 10 to be worked.
  • the pins 36, 38 are mounted for rotation in their heads 28, 30 and are aligned on a horizontal axis X *
  • the two pins 36, 38 have facing ends (not shown in detail) which are adapted to engage like centres the central bore 14 in the gear 10 to be worked.
  • the pin 38 can be moved along its axis X and in the direction of the arrow Fl by means of a hydraulic or pneumatic actuator 40 in order to clamp and centre the gear 10 relative to the pins 36 and 38 and to release it, as will be explained further below.
  • the support 32 carries a slide 42.
  • the slide 42 is movable vertically, as shown by the double arrow F2, by a wheel 44 for the purpose which will be explained below.
  • a drive shaft 46 with a horizontal axis is rotatable in the slide 42 and is arranged above the axis X of the pins 36 and 38.
  • a replaceable drive gear 48 is keyed to the drive shaft 46. The gear 48 is thus arranged to mesh with the gear 10 to be worked which is carried by the support means or pins 36, 38.
  • two slides 50 are mounted on the table in opposing positions relative to the axis X and are movable along a horizontal axis Y which is inclined to the axis X at an angle of the order of 60°.
  • Each slide 50 can be reciprocated along the axis Y by a respective hydraulic or pneumatic actuator 52.
  • the movement of the slides 50 is indicated by the double arrow F3.
  • Each slide 50 carries a hob 18, like that shown in Figure 1, with its axis vertical.
  • the means include a common electric motor 54.
  • the motor 54 drives a transmission system generally indicated 56.
  • the transmission. * "-system 56 includes a belt 58 which rotates a pair of "counter-rotating shafts 60, 62.
  • the shafts 60, 62 in turn drive respective telescopic shafts 70, 72 through respective toothed belts 64, 65 and respective universal couplings 66, 68.
  • the shafts 70, 72 in turn, through respective pairs of bevel gears. drive respective vertical shafts 73 which are mounted in the slides 50 and to which the hobs 18 are keyed.
  • the universal couplings 66, 68 and the telescopic structures of the shafts 70, 72 enable continuous rotary motion to be transmitted correctly from the motor 54 to the hobs 18 carried by the slides 50 regardless of the positions of the slides.
  • the shaft 60 transmits drive to a conventional gear unit 74 with four interchangeable gears.
  • the gear unit 74 enables the transmission ratio between the shaft 60 and a shaft 76 to be changed according to requirements.
  • the shaft 76 terminates in a worm-screw gear 78 which transmits drive to a telescopic shaft 80 with a vertical axis.
  • the shaft 80 is mounted in the support 32 and in turn transmits drive to the drive shaft 46 of the drive gear 48.
  • the ratios of the gear transmission system 56 are arranged so as to cause the continuous and synchronised rotation of the hobs 18, on the one hand, and of the gear 10 to be worked, through the drive wheel 48, on the other.
  • the hobs 18 can thus work continuously to remove chips from the edges of the teeth 12 ( Figure 1) and form the chamfers 16.
  • two rotations of the gear 10 suffice to form the chamfers 16.
  • the slides .50 may be advanced slightly during the working to increase the depth of cut.
  • the two slides 50 of the hobs 18 are reciprocable by means of the actuators 52 to bring the hobs into engagement with the gear 10 to be worked and to move them away from the gear.
  • the pin 38 is also movable relative to the pin 36 in order to clamp the gear 10 to be worked and to release it upon completion of the work.
  • the loading device 82 includes a feeder 84 situated along one side of the table 26.
  • the feeder 84 comprises a channel 86 in which the gears to be worked, again indicated 10, are deposited side-by-side and face-to face.
  • a pusher 88 is situated in the channel 86 and is moved in the direction of the arrow F4 by a screw-shaft 90 driven by a geared motor 92.
  • a chute 94 is associated with an output end of the channel 86 and extends perpendicular to the channel, downwardly from the output end thereof to an arrival station where a cradle, generally indicated 96, is situated.
  • the cradle 96 is carried by a slide 98 associated with a hydraulic or pneumatic actuator 100 which is arranged to cause the cradle 96, holding a gear 10 to be worked, to perform a cycle of movements, indicated by the double arrow F5, so as to bring the gear 10 to a position in which it meshes with the drive gear 48 and is centred on the axis of the pins 36 and 38.
  • the movable pin 38 moves towards the fixed pin 36 to clamp the gear 10 in the working position.
  • the slide 98 and the cradle 96 are withdrawn by the actuator 100 to the position of Figure 5.
  • the cradle 96 includes a half-cradle or spout 102 which can yield resiliently in the direction of the arrow F6 so that it can be lowered to the position shown in chain line in Figure 5 to release it from the gear 10.
  • the cradle 96 is pivoted on the slide 98 by means of a pin 104 so that it can yield resiliently in the direction of the arrow F7 if the gear 10 does not mesh with the drive gear 48 due to interference between their respective teeth.
  • a sensor 106 associated with the cradle 96, is mounted in the slide 98 and, in the event of interference, causes the cycle of movements of the cradle 96 to be repeated. Statistically, this repetition of the cycle results in a change in the orientation of the gear 10 in the cradle 96, so that meshing takes place at the end of the second cycle. If this does not occur, the cycle is repeated and continues to be repeated until meshing is achieved.
  • a window 108 is formed in the working zone of the table 26. Under this window is a cradle 110.
  • the cradle 110 is supported, so that it can be inclined, by means of a pin 112 on a bracket 114 which in turn is carried by the rod 115 of a hydraulic or pneumatic actuator (not shown) .
  • the cradle 110 can be raised and lowered by means of this actuator in the directions shown by the double arrow F8.
  • the cradle 110 When the chamfering of a gear 10 is complete, the cradle 110 is raised to the position shown in broken outline in Figure 6 and receives and supports the gear 10. At this point the pin 38 moves away from the pin 36, releasing the gear 10. The cradle 110 is then lowered to the position shown in continuous outline in Figure 6.
  • a pillar 116 is associated with the cradle 110 and carries a roller 118 at its upper end.
  • an arm 120 of the cradle engages the roller 118 causing the cradle 110 to be inclined to the position shown in Figure 6.
  • a chute or sloping channel 122 is also associated with the cradle 110 and the worked gear 10 can be unloaded into this by.rolling from the cradle 110 so as to reach an output .station constituted by a receptacle, a conveyor, etc.
  • the machine described and illustrated is versatile in that it can chamfer the edges of the teeth of gears of different diameters and pitches. In order to change from one type of gear to be chamfered to another, it suffices, if necessary, to change the drive wheel 48 and possibly the hobs 18 and to modify the ratio of the gear unit 7 . correspondingly.
  • the presence of the vertically-movable slide 42 enables gears 10 and 48 to be meshed throughout a range of interaxial spacings.
  • a simpler machine could include only ⁇ ne hob such as 18 for chamfering the edges of only one face of an annular gear at a time.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gear Processing (AREA)
PCT/EP1990/001238 1989-08-01 1990-07-30 A machine for chamfering the sharp edges of the teeth of annular gears WO1991002201A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8967661A IT1233233B (it) 1989-08-01 1989-08-01 Macchina per la smussatura degli spigoli dei denti di ruote dentate cilindriche
IT67661-A/89 1989-08-01

Publications (1)

Publication Number Publication Date
WO1991002201A1 true WO1991002201A1 (en) 1991-02-21

Family

ID=11304312

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1990/001238 WO1991002201A1 (en) 1989-08-01 1990-07-30 A machine for chamfering the sharp edges of the teeth of annular gears

Country Status (2)

Country Link
IT (1) IT1233233B (it)
WO (1) WO1991002201A1 (it)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105436625A (zh) * 2015-12-23 2016-03-30 浙江台玖精密机械有限公司 自动蜗杆去残齿装置及其去残齿方法
CN105499713A (zh) * 2015-12-23 2016-04-20 浙江台玖精密机械有限公司 自动蜗杆去残齿装置及其去残齿方法
CN110434408A (zh) * 2019-08-21 2019-11-12 瑞安市悦华汽车单向器有限公司 单向器驱动齿轮的自动倒角机

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1680083A (en) * 1923-09-25 1928-08-07 Dodge Brothers Inc Gear-chamfering machine and method for chamfering gear teeth
US3818796A (en) * 1973-04-09 1974-06-25 Bird Island Inc Cutting teeth on workpieces
DE3310000A1 (de) * 1983-03-19 1984-09-20 Präwema Präzisionswerkzeugmaschinenfabrik KG Maschinenkontor GmbH & Co, 3440 Eschwege Maschine zum bearbeiten von zahnkanten

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1680083A (en) * 1923-09-25 1928-08-07 Dodge Brothers Inc Gear-chamfering machine and method for chamfering gear teeth
US3818796A (en) * 1973-04-09 1974-06-25 Bird Island Inc Cutting teeth on workpieces
DE3310000A1 (de) * 1983-03-19 1984-09-20 Präwema Präzisionswerkzeugmaschinenfabrik KG Maschinenkontor GmbH & Co, 3440 Eschwege Maschine zum bearbeiten von zahnkanten

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105436625A (zh) * 2015-12-23 2016-03-30 浙江台玖精密机械有限公司 自动蜗杆去残齿装置及其去残齿方法
CN105499713A (zh) * 2015-12-23 2016-04-20 浙江台玖精密机械有限公司 自动蜗杆去残齿装置及其去残齿方法
CN110434408A (zh) * 2019-08-21 2019-11-12 瑞安市悦华汽车单向器有限公司 单向器驱动齿轮的自动倒角机
CN110434408B (zh) * 2019-08-21 2024-02-09 瑞安市悦华汽车单向器有限公司 单向器驱动齿轮的自动倒角机

Also Published As

Publication number Publication date
IT8967661A0 (it) 1989-08-01
IT1233233B (it) 1992-03-20

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