US3499252A - Means for generating involute gears - Google Patents

Means for generating involute gears Download PDF

Info

Publication number
US3499252A
US3499252A US693234A US3499252DA US3499252A US 3499252 A US3499252 A US 3499252A US 693234 A US693234 A US 693234A US 3499252D A US3499252D A US 3499252DA US 3499252 A US3499252 A US 3499252A
Authority
US
United States
Prior art keywords
slide
generating
gear
crank
involute
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
US693234A
Other languages
English (en)
Inventor
Peter Herbert Cleff
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of US3499252A publication Critical patent/US3499252A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23F—MAKING GEARS OR TOOTHED RACKS
    • B23F23/00—Accessories or equipment combined with or arranged in, or specially designed to form part of, gear-cutting machines
    • B23F23/003—Generating mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23F—MAKING GEARS OR TOOTHED RACKS
    • B23F5/00—Making straight gear teeth involving moving a tool relatively to a workpiece with a rolling-off or an enveloping motion with respect to the gear teeth to be made
    • B23F5/02—Making straight gear teeth involving moving a tool relatively to a workpiece with a rolling-off or an enveloping motion with respect to the gear teeth to be made by grinding
    • B23F5/06—Making straight gear teeth involving moving a tool relatively to a workpiece with a rolling-off or an enveloping motion with respect to the gear teeth to be made by grinding the tool being a grinding disc with a plane front surface

Definitions

  • a mechanism for producing relative movement between a workgear and a grinding wheel comprises an arrangement of rotation and sliding members designed to produce the required movement in accordance with a given basic equation.
  • This invention relates to means for generatively finishing, for example by grinding, the pre-cut tooth flanks of external or internal cylindrical gear Wheels or pinions having either straight spur orhelical teeth of either involu'.e or modified involute form.
  • the principal object of the invention is to provide improved means for the involute generative movement of a work-gear past stationary grinding wheels or, inversely, the involute generative movement of grinding wheels past a stationary work-gear.
  • FIG. 1 of the accompanying drawings illustrates this principle of involute generation diagrammatically.
  • Grinding wheels 1 and 2 are motor-driven to rotate round their respective axes of rotation 1a and 2a, but are otherwise stationary relative to the main machine bed 8.
  • Work-gear 3, i.e. the gear to be ground, is firmly mounted on an arbor or spindle 4 rotatably journalled in a rectilinearly reciprocating slide 5, the direction of said reciprocation being at right angles to the axis of workgear rotation.
  • a pitch block or roll segment 6 of the required size is drive-connected to, and co-axial with, arbor 4.
  • Thin, flexible steel tapes (at least two in number) 7a and 7b are wrapped around the roll segment in a respectively right-about and left-about manner and fastened at their respective inner ends to the roll segment or pitch block 6.
  • the outer ends of the tapes are anchored to the stationary main machine bed 8 on which aforesaid slide is recirprocated by means of a power driven Scotch Yoke mechanism 9, 9a and 10.
  • Another disadvantage is the impossibility of running gear grinding machines of this type at high, or very high, generating speeds because of the dynamic stretch of the steel tapes and consequent profile errors on the gear being ground, especially when grinding gears having a high mass-moment of inertia.
  • FIG. 1 is an end view of an involute generative gear grinding machine using pitch block and steel tapes as means of involute generation, as described above.
  • FIG. 2 shows the basic mechanism according to the invention, FIG. 2(L), and the underlying mathematical and kinematical principles, FIG. 2(R),
  • FIG. 3 illustrates the complete roll-generating mechanism in accordance with the invention, FIG. 3(L), and the underlying mathematical and kinematical principles, FIG. 3(R),
  • FIG. 4 shows the structural errors of the complete roll-generating mechanism of FIG. 3(L) for roll-angle ranges of respectively plus/minus 30 and plus/minus 40 arcdegrees
  • FIG. 5 is an end view of an involute generative gear grinding machine similar to that of FIG. 1, but with the roll-generating mechanism of FIG. 3 having replaced the steel tape drive.
  • the roll-generating mechanism in accordance with the invention and in its basic form is essentially a turning block slider crank whose output member drives through a slide/pivot member a main output slide which is slidably guided in a direction at right angles to the line joining the centres of the first and second main pivot of the aforementioned turning block slider crank mechanism.
  • a first main pivot 11 round which a crank 12 of radius R may rotate through plus/minus 4).
  • a pivot 13 Attached to the outer end of said crank 12 and at a distance R from the centre of the first main pivot 11, is a pivot 13 carrying rotatable thereon a slide block 14.
  • Said slide block 14 is in drive engagement with rectilinear inner guides 15 machined into a lever 16 which is rotatably held by a second main pivot 17 secured to the base of the mechanism and a certain vertical distance away from the first main pivot 11.
  • Lever 16 is in drive engagement with a guide block 18 by means of its rectilinear outer guides 19.
  • Said guide block 18 is pivotally connected to a main output slide 20 by means of a pivot 21, enabling the main output slide 20 to be moved along a fixed rectilinear guide bar 22 whose centre line runs at right angles to the line joining the centres of the first main pivot 11 and second main pivot 17 and lies a certain pie-determined vertical distance away from the first main pivot 11.
  • crank 12 has been extended radially to form small crank 23 of radius r with pivot 24 at that distance from the first main pivot 11, and with all three pivots 13, 11 and 24 lying in line.
  • Hinged to pivot 24 is a connecting rod 25 of length 1 whose other end is movably connected to an extension pivot 26 of second main pivot 17.
  • Second main pivot 17 is now no longer fixed, but has been made movable in the direction of a line passing through first main pivot 11 and being at right angles to the centre line of fixed rectilinear guide bar 22, by means of slide 27 and therewith associated rectilinear guide bars 28.
  • the accuracy of circle rectification, by a mechanism constructed in accordance with the invention, is extremely high. This is illustrated in FIG. 4 and shows that for a total maximum angular swing of crank 12 by 60 arcdegrees (plus/minus 30 arcdegrees) the maximum structural erroris of the order of +0.7-l0 inch/inch of radius R or less than 0.15 arcsecond. Even for a maximum swing of 80 arcdegrees the maximum structural error does not exceed the linear equivalent of 1 arcsecond.
  • FIG. 5 shows, in accordance with the invention, the mechanism of FIG. 3 suitably adapted by inversion to the requirements of a gear grinding machine similar to that illustrated in FIG. 1.
  • the mechanism is now carried on reciprocating slide 5 as'the base.
  • Cranks 12+23 are drive-connected to work-gear spindle 4, and main output slide 20 has become integral with the rectilinear guide bar 22 such that pivot 18 is now rendered stationary on the centre line of the machine.
  • a mechanism for use in an involute-generating gear grinding machine to produce roll-rectilinear relative movement between a workgear carried on a reciprocating generating slide and a rotatable grinding wheel of rectilinear generatrix comprising a turning block slider crank and a slider crank mechanism so arranged in compound that, upon a reciprocation (s) of said workgear-carrying generating slide of generative radius (R said workgear is rotated relatively to said generating slide through an angle (arc such that the arrangement of said turning block slider crank mechanism comprising, a crank of radius R co-axially and drivingly-connected to said workgear, a first slide-block pivoted at the outer end of said crank and engaging internal rectilinear guide-ways of a lever constrained to slide at its upper end, by means of a pair of external rectilinear guide-ways, through a second slide-block pivotally mounted on a stationary main machine frame above the workgear axis, the lower end of said lever being constrained to oscillate about

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
US693234A 1967-01-06 1967-12-26 Means for generating involute gears Expired - Lifetime US3499252A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB844/67A GB1209051A (en) 1967-01-06 1967-01-06 Improvements in and relating to means for generating involute gears

Publications (1)

Publication Number Publication Date
US3499252A true US3499252A (en) 1970-03-10

Family

ID=9711445

Family Applications (1)

Application Number Title Priority Date Filing Date
US693234A Expired - Lifetime US3499252A (en) 1967-01-06 1967-12-26 Means for generating involute gears

Country Status (5)

Country Link
US (1) US3499252A (de)
CH (1) CH480904A (de)
DE (1) DE1652793A1 (de)
FR (1) FR1605088A (de)
GB (1) GB1209051A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4142333A (en) * 1976-09-15 1979-03-06 Maag Gear-Wheel & Machine Company Limited Generating method for grinding cylindrical gears
WO1984004064A1 (en) * 1983-04-15 1984-10-25 Ingersoll Milling Machine Co Method of generating involute tooth forms with a milling cutter

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1187616A (en) * 1912-04-04 1916-06-20 New Process Raw Hide Company Gear-grinding machine.
US1515281A (en) * 1922-03-23 1924-11-11 Lees Bradner Co Gear-grinding apparatus
US2388173A (en) * 1940-12-20 1945-10-30 Feilows Gear Shaper Company Generative grinding machine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1187616A (en) * 1912-04-04 1916-06-20 New Process Raw Hide Company Gear-grinding machine.
US1515281A (en) * 1922-03-23 1924-11-11 Lees Bradner Co Gear-grinding apparatus
US2388173A (en) * 1940-12-20 1945-10-30 Feilows Gear Shaper Company Generative grinding machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4142333A (en) * 1976-09-15 1979-03-06 Maag Gear-Wheel & Machine Company Limited Generating method for grinding cylindrical gears
US4565474A (en) * 1980-11-01 1986-01-21 The Ingersoll Milling Machine Company Method of generating involute tooth forms with a milling cutter
WO1984004064A1 (en) * 1983-04-15 1984-10-25 Ingersoll Milling Machine Co Method of generating involute tooth forms with a milling cutter

Also Published As

Publication number Publication date
GB1209051A (en) 1970-10-14
FR1605088A (de) 1973-01-12
DE1652793A1 (de) 1971-02-25
CH480904A (de) 1969-11-15

Similar Documents

Publication Publication Date Title
US3916569A (en) Methods of and means for producing helically toothed gears
GB351092A (en) Improvements in and relating to grinding machines for helical gears
US3730014A (en) Rotary indexing mechanism
US3499252A (en) Means for generating involute gears
US3521368A (en) Apparatus for checking the flanks of gears,especially bevel gears
US3877150A (en) Gear generating machine for making and testing involute gears
US3429195A (en) Lead mechanism
US2404573A (en) Gear grinding machine
US1925025A (en) Process and apparatus for accurately cutting and rectifying gears
US2932923A (en) Machine for generating gears
US1755349A (en) Lathe mechanism for oval turnings
US3126472A (en) Contour welding machine
US3624972A (en) Generating mechanism for a gear grinding machine for helical gears
US2861502A (en) Devices for cutting and generating hypocycloidal gears
US3584424A (en) Means for generating involute and noninvolute gears
US2772670A (en) Grinding wheel truing mechanism
US2207018A (en) Machine for grinding gear teeth by the generating process
US2387167A (en) Generative gear grinding machine with feed controlling slide
US2154054A (en) Generating curved surfaces
US2782647A (en) Mechanical movement for converting rotary motion into reciprocating motion having an adjustable nonharmonic stroke and a quick return stroke
US2376110A (en) Machine for machining screw gears
US2860451A (en) Gear generating machines
US4739587A (en) Rolling drive for a gear-grinding machine
SU745613A1 (ru) Станок дл шевинговани цилиндрических зубчатых колес
US3740899A (en) Machine for lapping spiral bevel and hypoid gears