US2472644A - Gear hobbing machine attachment - Google Patents

Description

June 7, 1949. w, BARQUS 2,472,644

GEAR HOBBING MACHINE ATTACHMENT Filed March 17, 1945 3 Sheets-Sheet 1 June 7, 1949. J. w. BARCUS GEAR HOBBING MACHINE ATTACHMENT 3 Shets-She et 2' Filed March 17, 1.945

fWfBar cus x mm June '7, 1949.

Filed March 17, 1945 J. w. BARcu GEAR HOBBING MACHINE ATTACHMENT k I s Sheets-Sheet s c/IWBaraus Patented June 7, 1949 UNITED STATES PATENT OFFICE GEAR HOBBING MACHINE ATTACHMENT John W. Barcus, Baltimore, Md., assignor of fifty per cent to N. R. Kneass, Baltimore, Md.

14 Claims. 1

This invention relates to gear hobbing machines, and more particularly to an attachment by means of which spherical gears may be cut on a. conventional hobbing machine.

An object of this invention is to provide a simple attachment which can be mounted on a conventional bobbing machine of the type wherein the cutter is movable in both vertical and horizontal planes by hydraulic or other operating means, so that spherical gears may be cut on such machine.

Another object of this invention is to provide in combination with a gear hobbing machine means whereby the cutter is shifted in its movement through the blank or workpiece in a manner to provide for spherical cutting on the surface of the workpiece.

A further object of this invention is to provide a device of this kind which can be mounted on a hydraulic hobbing machine without change in the present parts of the machine, the device being of simple construction. and of sufiicient strength to eliminate undue strains or torsion, and provide for the accurate cutting of the teeth in the gear blank.

A further object of this invention is to provide a device of this kind which can be accurately adjusted, so that gears of various diameters can be accurately out.

A further object of this invention is to provide a device of this kind, which will permit rapid cutting of gears without frequent setting of the parts so that mass production can be accomplished.

To the foregoing objects and others which may hereinafter more fully appear, the invention consists of the novel construction, combination and arrangement of parts, as will be more specifically referred to and illustrated in the accompanying drawings, but it is to be understood that changes, variations, and modifications may be resorted to which fall within the scope of the invention as claimed.

In the drawings:

Figure 1 is a detail side elevation, partly broken away and in section, of a conventional gear hobbing machine of the hydraulic type. having mounted thereon a spherical gear forming means constructed according to an embodiment of this invention.

Figure 2 is a fragmentary sectional view taken on the lin 22 of Figure 1.

Figure 3 is a detail side elevation of the a justable linkage.

Figure 4 is a fragmentary sectional view taken on the line 44 of Figure 1.

Figure 5 is a fragmentary sectional view taken on the line 5-5 of Figure 1.

Figure 6 is a sectional view taken on the line 6-6 of Figure 4.

Figure 7 is a sectiona1 view taken on l'! of Figure 4.

Figure 8 is a diagrammatic view showing the operation of the device.

Figure 9 is a sectional view taken on the line 9-9 of Figure 1.

Referring to the drawings, the numeral l0 designates generally a hobbing machine, including a bed I I, having a horizontally disposed guide or track l3 on which an upright carriage support i2 is slidably mounted. The carriage support I2 is movable lengthwise of the track or guide I3 by hydraulic or other power means (not shown). The support I! has slidable on the forward side 14 thereof a carriage l5, which is vertically movable by hydraulic, mechanical, or other suitable power means.

An upright standard I6 is secured to the bed, or base H, at the forward end thereof and has extending therefrom a supporting arm ll, having a holding member l8 secured thereto for rigidly holding the upper end of a shaft, spindle, or the like. The bed, or base II, has rotatably mounted thereon a work support [9, which is rotatable about a vertical axis. The carriage l5 has mounted thereon a rotatable spindle 20, on which a gear hob 2| is adapted to be secured for cutting teeth in a blank workpiece 22, which the line is secured to the work support l9. At the present time the workpiece 22 is a blank gear, which is formed with a spherical peripheral surface 23, and the gear formed from the workpiece 22 is similar to the gear shown in my prior Patent No. 2,302,813, dated December 1, 1942.

In order to provide a means whereby the hob, or cutter 2!, will be adjusted as it is rotated in order to cut spherical teeth in the periphery of the blank 22; I have provided an adjustable link structurewhich is connected to the bed and the carriage support l2, so as to shift the support !2 rectilinearly simultaneously with the vertical movement of the carriage [5.

There is a linkage, generally designated by the numerals 24 and 25, on each side of the hobbin machine and the detail description of one linkage will apply equally as well to the other. The linkage 24 includes an elongated threaded shaft 26, which is formed with square threads extending substantially throughout the length thereof.

and the shaft 26 is formed with a reduced diameter portion 21 adjacent one end thereof, which is journalled in a block, or mounting, 28.

A bearing sleeve 29 is disposed about the shaft portion 21 within the block 28. The shaft portion 21 is held against endwise movement with respect to the block 28 by means of an annular nut 36, which is threaded on a reduced stud 3| formed on the shaft portion 21. An annular collar or flange 32 is formed integral with the adjacent end of the threaded shaft 26 and bears. against the side of the block 28 oppositely from the nut 30. The nut 30 is locked on the stud 3| by means of a set screw 33, The shaft 26 is also formed with a square stud 34 extending from the stud 3|, and a shaft rotating wheel 35, having a hub 36 formed with a'sq'uare bore 31, en gages about the square stud 34.

A nut 38 is threaded. on a reduced threaded stud 39, extending from the square stud 34, and a washer 48 'is'interposed between the nut 38 and the adjacent end of the hub 36. An index plate 4|, having a hub or boss 42 formed with a square bore, ismounted on the square stud 34 between the inner end of 'the hub 36 and the outer end of the nut 30. The index member 4| is provided with a tapered outer side 43, having graduation 44 thereon which are correlated with a pointer, or mark, 45 carried by the block 28.

The block 28 has extending laterally thereof a stud 46, which has a bushing 41 engaging thereabout, and the bushing 41 is mounted in a vertically disposed supporti'ngplate 48. The stud 46 is rockably secured with respect to the plate 48 by means of a plate, or washer, 49 secured to the inner end of the stud 46 by means of a screw 50. The supporting plate 48 is secured to one side of the bed I I by means of fast'eningmembers |,and is disposed in a position whereby the axial center of the stud 46 will be disposed in the same plane asthe axial center of the workpiece 22.

The shaft 26 is threaded through a nut, or block, 52 which is adjustably secured to the carriage I5, as will be hereinafter described.

The nut or block 52 has formed integral therewith a stud 53, having a bushing 54 disposed 'thereabout, and is rotatably mounted in a bearing 55. A spacing washer 56 may be interposed between the bearing 55 and the adjacent, or inher side of the nut 52, so as to position the nut '52 in the desired spaced relation with respect to the carriage I 5. The stud 53 is held against endwise movement with respect'to the bearing 55 by means of a plate, or washer, 51 secured to the -inner end of the stud 5:3 by means of a bolt or screw 58.

'The bearing 55 has extending vertically upwardly therefrom a threaded shaft, or support, '59. The shaft 59 extends through a bore 60 formed in a block'BI, having flanges 62 secured by fastening members 63 to the side of the carriage I5. The axis of the stud 53 may be disposed below the horizontal axis of the hob 2| and spindle 20, and preferably the shaft 26 is in a'horizontal position when the axial center of the hob"2| is inthe horizontal plane of the cen- -ter of the workpiece -22.

The bearing supporting shaft "59'is vertically adjusted and locked in "its vertically adjusted position by-meanspf nuts-63 and 64 threaded on the shaft 59 and engaging about the opposite ends of the supporting block or member 6|.

*In' the-useand operation of this invention the two plates *48 are mounted on opposite sidesof the bed *or base -l=l "in 'a -=position "whereby axial 4 centers of the studs 46 will be in the plane of the vertical axis of the work support I9 and the workpiece 22. The blocks or mountings 6| are secured to the opposite sides of the hob carriage I5, and the nuts 52 are vertically adjusted so that the longitudinally axis of the screw shaft 26 will be in a horizontal plane at the same time that the axial center of the hob spindle 20 is in the same horizontal plane as the horizontal center or axis of the workpiece 22.

Referring to Figure 8 of the drawings, the hob 2| is raised to a point just above the upper end of. the workpiece 22. At this time the screw shaft 26, which is shown in full line in Figure 8, will be upwardly inclined. As carriage I5 moves downwardly,'the carriage supporting member I2 will be shifted horizontally, so that the hob 2| will move on an arc, having as a center the center of the workpiece 22. The hob 2| will move downwardly to substantially the position shown by the dot and dash line in Figure 8, and atthis time the screw shaft or link 26 will swing downwardly with the stud, as a pivot to thedot and dash line position. The carriage support l2 will initially move away from the workpiece 22 to the limit shown by the dot and dash line in Figure 8. and will then be moved toward the workpiece to the full line position shown inFigure 8.

Thi structure may be formed as an attachment for a conventional gear bobbing machine, particularly of the type having a horizontally shiitable carriage support, orstanchion, for the hob carriage. The provision of the-screw shaft 26- permits initial adjustment of the support, or stanchion, I2 so as to pe mit cutting blanks of difierent diameters, This device will operate on machines which cut teeth in the blanks in either one or more traverses of the hob. The screw shafts provide a means whereby the depth of the cut formed in the blank by the hob can be adjusted, as may be desired.

The exact configuration illustrated is regarded s the pt mum. but some of the desirabl r sults inherent in thi disclosure may be obtained by various slight modifications including some departure from the exact configuration shown, and it is therefore requested that the scope of the invention should be regarded as limited only by the terms of the claims.

What I claim is:

1, In combination, a gear bobbing machine including a stationary bed. a hor zontally slidable stanchion carried by said bed, a vertically s1idable carriage carried by said stanchion, a pair of links, and means pivotally connecting said links together, means pivotally securing one of said links to said bed, andmeans securin the other of said links to said carria e whereby s d stam chion will move horizontally with vertical movemerit of said carriage said lattermeans including mean for djustin aid other l n means n s wise.

2. In a gear hobbing machine havin a, stationary bed, a horizontally movable stanchion and a vertically movablehob carriage, an at tachment for' said machine whereby to out spherical gears, comprising a pair of pivotally connected together links, means pivotally con; necting one of said links to said bed and means fixedly securing the other of 'said links to said carriage whereby to effect horizontal movement of said stanchion simultaneous with the vertical movement of said carriage. w

3. In a gear hobbing machine as set forth in claim 2 wherein said pivot means is adjustable in a manner to vary the spacing between the Pivots.

4. In a gear hobbing machine having a stationary bed, a horizontally movable stanchion and a vertically movable hob carriage on said stanchion, an attachment for said machine whereby to cut arcuate teeth comprising a part adapted for attachment to said carriage, a second part adapted for connection to said bed, and a pivoted connection between said parts and said bed.

5. In a gear hobbing machine having a stationary bed, a horizontally movable stanchion on said bed and a vertically movable hob carriage on said stanchion, an attachment for said machine comprising a pair of pivotally connected together elongated members, and means connecting said members to said bed and said carriage in a manner whereby vertical movement of said carriage will eiTect horizontal movement of said stanchion.

6. In a gear hobbing machine having a stationary bed, a horizontally movable stanchion on said bed and a vertically movable hob carriage on said stanchion, an attachment for said machine comprising a pair of pivotally connected together members, and means mounting said members on said bed and carriage whereby vertical movement of said carriage will efiect positive movement of said stanchion in either direction.

'7. In a gear hobbing machine having a stationary bed, a horizontally movable stanchion on said bed and a vertically movable hob carriage on said stanchion, an attachment for said machine comprising a pair of pivotally connected together elongated members, means adjusting said members endwise, and means connecting said members to said bed and said carriage in a manner whereby vertical movement of said carriage will eiT-ect horizontal movement of said stanchion.

8. An attachment for a milling machine having a stationary bed, a horizontally movable stanchion on said bed and a vertically movable hob carriage on'said stanchion, said attachment comprising a pair of pivotally connected members, and means securing said members to said bed and said carriage whereby vertical movement of said carriage will effect positive rectilinear movement of said stanchion in either direction.

9. An attachment for a milling machine having a stationary bed, a horizontally movable stanchion and a vertically movable hob carriage on said stanchion, said attachment comprising a pair of threaded elongated members, a part threaded onto one of said members, means pivotally connecting said part to the other member, means rotatably securing said one member to said bed, a second part fixed to said carriage, and means adjusting the endwise position of said other member relative to said second part Whereby vertical movement of said carriage will effect horizontal movement of said stanchion.

10. In combination, a gear cutting machine including a stationary bed member, a stanchion horizontally movable on said member, a carriage member vertically movable on said stanchion, and pivotally connected means secured together and to both of said members for effecting positive rectilinear movement of said stanchion in either direction upon vertical movement 01" said carriage member.

11. In combination, a gear cutting machine including a stationary bed member, a stanchion horizontally movable on said member, a carriage member vertically movable on said stanchion, a pair of pivotally connected together elements, mean-s swingably securing one of said elements to one of said members, and means fixedly securing the other of said elements to the other of said members.

12. In combination, a gear cutting machine including a stationary bed member, a stanchion horizontally movable on said members, :a carriage member vertically movable on said stanchion, a pair of elongated threaded elements, a block pivotally carried by one of said elements and formed with a threaded opening through which the other element threadedly engages, means swingably and rotatably supporting said other element from one of said first named members, and means securing said one element to the other of said elements whereby said one element may be adjusted endwise, vertical movement of said carriage effecting horizontal movement of said stanchion.

13. In a gear hobbing machine having a stationary bed, a horizontally movable stanchion on said bed and a vertically movable hob carriage on said stanchion, an attachment for said machine whereby to cut arcuate teeth comprising a part for attachment to said carriage, a second part for attachment to said bed, a pair of threaded links connecting said parts, a nut for one of said links pivotally carried by one of said parts, and a bearing block fixedly carried by the other part through which the other link extends.

14. In a gear hobbing machine attachment as set forth in claim 13 including means adjustably supporting said other link from said bearing block.

JOHN W. BARCUS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,639,624 Woltzendorff Aug. 16, 1927 2,315,068 Matthews Mar. 30, 1943

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