US1078570A - Grinding of toothed wheels, milling-cutters, and the like. - Google Patents

Description

A. AIGHELE. GRINDING 0F TOOTHBD WHEELS, MILLING CUTTERS, AND THE LIKE.

APPLICATION FILED DEG. 15, 1911 00 1L m L 4 n d8 62 m w a P.

Albert flicks/Z6, 6 7%flw Ja s.

liq/thaw? M c JM A. AICHELE. GRINDING OP TOOTHED WHEELS, MILLING GUTTERS, AND THE LIKE.

PPLIOATION FILED DE(}.15I 1911.

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for the mutual STATES PATENT OFFICE.

AHBERT AICHELE, 0F BADEN, SWITZERLAND.

GRINDING OF TOOTHED-WHZEELS, HILLING-CUTTERS, AND THE LIKE.

Specification of Letters Patent.

Application filed December 15, 1911.

Patented Nov. 1 1, 1913. Serial No. 865,895.

To all whom it may concern:

Be it known that, l, Ansnnr Arcnnnn, a

citizen of the Swiss-Republic, and residing at Baden gwitzerland, have invented certain new and useful Improvements in and Relating to the Grinding of Toothed l/Vheels, MillingCutters; and the like, of which the following is a specification.

This invention relates to the mutual grinding of toothed wheels, milling cutters and the like bodies.

It isan'essent-ial condition for the smooth working of toothed wheels that the transmission of power shall be perfectly free from jolts, that is to say, in the case of uniform motion of the driving wheel, the

driven wheel or wheels must also have perfectly uniform motion. To satisfy this con dit-ion, it is necessary that the teeth shall have a mathematically accurate profile. In practice, however, such construction is almost im ossible especially in the case of wheels -Wl11C-h are hardened after manufacture. It has heretofore been attempted to grind the wheels mutually or together after manufacture. A satisfactory result has however not been achieved with the processes known hitherto.

The object of the present invention is to provide a process and apparatus for producing the required shape during mutual grinding.

This invention consists in an apparatus rinding of toothed wheels or the like in which two shafts are provided carrying the wheels to be ground and carrying in addition driving means, suitablerelative movement being imparted to the wheels to be ground.

Referrin'gto the accompanying drawings which show by way of example one construction of apparatus for carrying into effect the present invention, in which the driving of the axles of the toothed wheels is effected by means of friction disks, Figure 1 is a side elevation. Fig. 2 is a sect-ion of the apparatus showing means for angularly displacing the wheels undergoing grinding relatively to each other. Fig. 3 shows means for angularly displacing one of the shafts c and (Z. These two shafts are driven by friction disks 6 and f which are driven in their turn by a common friction disk 9 the driving of the disk f being effected by the interposition of an idle wheel h for reversing the direction of rotation ofthe disk I with respect to the disk e.- This idle wheel h is pressed by the spring 6 against the disks f an 9. A crank mechanism 70 is provided by means of which the shaft 0 and through it the toothed wheel a can be moved to-andfro in the axial direction. I The screw spindle Z serves the purpose of moving the two axles c and (Z nearer to each other until the disks 6 and f come in contact and therefore the toothed wheels roll on the pitch circles. The arm m is mounted on the center 0 for the purpose of insuring the driving of e by the disk 9 in every position. I

In order to allow of shifting the position of the toothed wheels relatively to their driving device, the wheel 6 for instance is fixed to the shaft cl by means of an interposed worm drive 72 in such a manner that by rotating the worm Wheel relative to the aims can be effected.

According to the above arrangement for the, urpose of startin the process the axles of tie two toothed wheels to be ground in, which are at a Variable distance apart, are removed so far apart that at first there is no contact between the teeth as in Fig. 4, and then they are gradually moved nearer to each other until the teeth are in contact (Fig. 5), but at first only at the points which constitute the greatest deviation from the ideal shape of the tooth. At the same time one of the toothed wheels is moved to-and-fro in. the axial direction by a separate driving device. This movement is mainly intendedto effect the grinding with the use of a grinding material. This axial movement is not intended to accelerate the grinding in, and it affords important advantages inasmuch as the grinding in of the toothed wheels under the influence of the rotary motion does not alone effect the obect in view .111 a per e t manner because una shifting of the In the form illustrated the two ing portions of the teeth have been ground away in the above described manner, the axles of the two toothed wheels are moved nearer to each other so that fresh places come in contact and are ground away, Fig. 6.

' This is continued until the pitch circles of greater the toothed wheels come in contact with each other.

When the teeth are chosen from the first, thicker than the final shape, then after carrying out the present process the profile of the tooth will have been completely ground, so as to produce toothed wheels which will mesh with one another with an ideal shape of tooth. ,If the teeth at the commencement of the operations were thicker than the thickness required to enable them to work together without any play when finally shaped, then at the termination of the operations teeth of ideal form will be produced which will mesh without play. If the teeth originally were thinner than required by the ideal form of tooth without play, and could not therefore be ground down to the said ideal form, a special apparatus-is provided for the purpose of producing a correct form of tooth with some play between the teeth.

Since in the case of mutually engaging toothed wheels it is usually required to keep to determined pitch circles, the axles should not be moved nearer to each other than the point at which the pitch circles touch each other. Now in order, when this position of the axles has been reached, to enable the engaging tooth faces of the two wheels to be pressed together with the requisite pressure for mutual grinding, one of the toothed wheels to be ground is shifted through a certain angle in the sense for efiecting this intimate contact, conveniently by rotating its shaft relatively to the driving means therefor. Thus the grinding operation; is continued until all parts of the surfaces" of the mutually contacting tooth faces have been ground and the ideal tooth form has been produced on one face of the teeth as shown in Fig 7. Whereupon by shifting this toothed wheel in the other sense by the amount of the play between the tooth faces the other face of the tooth can be ground.

A one-sided pressure on the teeth acting continuously on one side or the other may also be produced by making the ratio between the peripheral speeds in the driving device of the two axles of the toothed wheels, or smaller than the'ratio between the toothed wheels to be ground in, and by this means a grinding away of one side or the other of the tooth profile can be effected.

- friction disks, may

This alteration of the ratio of the pair of driving toothed wheels and the pair of toothed wheels must naturally be made so small that its effect will be equal to that of the aforesaid continuous shifting of the wheels to be ground in relatively to the driving device. Non-positive driving devices, for instance, be employed for driving the axles of the toothed wheels.

Having now described my invention what I claim as new and desire to secure by Letters Patent is 1. An apparatus for the mutual grinding of toothed wheels or the like, comprising axles for the wheels, independent supports for each axle and means for varying and fixing the distance between said axles and arranged to contact with one another, a driving wheel in contact with one of said friction wheels and an intermediate idle wheel contacting with the other of said friction wheels and said drivin wheel toether with means for longitudinally movmg the wheel axles; as set forth.

2. An apparatus for the mutual grinding of toothed wheels or the like, comprising in combination axles, friction dlsks mounted with the wheels to be ground on said axles, a friction driving wheel arranged 'in contact with one of said friction disks, a standard for the axle of one friction disk and for the axle of the driving wheel, a bell crank lever, said lever carrying the other friction disk and being mounted on the axle of the driving wheel, a screwed rod connecting said standard and said lever with hand means for rotating said rod, a further lever pivoted in said standard, a friction disk mounted on said lever and a spring connecting this lever'with the standard; as set forth.

3. An apparatus for the mutual grinding of toothed wheels or the like, comprising pivoted standards with means for determining their distance a art, axles carrying wheels to be groun mounted in said standards, gear wheels mounted on said axles and a driving wheel with axle also mounted in said standards and contacting with one of said gear wheels, a rotary device connecting said driving wheel with the other of said wheels and means for effecting the longitudinal shifting of the wheel axles; as set forth.

4. An apparatus for the mutual grinding to one another and means for driving each as set forth.

wheel independently;

the mutual grinding 5. An apparatus for the wheels to be ground with respect to their in combination two shafts, driving means driving device; as set forth; 10 mounted thereon and intermeshing and com- In testimon whereof, I aflix my signature prising at least two toothed wheels of such in presence 0 two witnesses.

of toothed wheels or the like comprising 5 relative hardness and relative diameter that ALBERT AICHELE.

substantially equal degrees of abrasion 00-, F Witnesses: cur per tooth on each wheel, together with HARRY A. MCBRIDE, means for changing the relative. posltion of i AUoUsT RIVEGG.

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