US1080505A - Grinding of toothed wheels, milling-cutters, and the like. - Google Patents

Description

A. AIGHELE.

GRINDING 0P TOOTHED WHEELS, MILLING CUTTERS, AND THE LIKE.

APPLICATION rum) AUG.8, 1913 1,080,505, Patentd Dec.2,1913.

2 SHEETS-SHEET 1.

AND THE LIKE.

GRINDING 0F TOOTHED APPL 1 ,080 ,505

AICHELE.

BLS, MILLING CUTTERS, TION FILED AUG.8, 1913.

- Patented Dec. 2, 1913.

2 8HBETS-SHEET 2.

UNITED STATES PATENT ornronf.

ALBERT AICHELE, 0F BADEN, SWITZERLAND.

GRINDING OF TOOTHED WHEELS, MILLING-CUTTERS, AND THE LIKE.

Specification of Letters Patent.

Patented Dec. 2, 1913.

Original application filed December 15, 1911, Serial No. 665,895. Divided and this application filed August 8, 1913. Serial No. 783,745.

To all whom it may concern Be it known that I, A BERT Aionnnn, a citizen ofthe Swiss Republic, and residing at Baden, Switzerland, have invented certain new and useful Improvements in and Relating to the Grinding of Toothcd lVheels, Milling-Cutters, 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. I

It is an essential condition for the smooth 'working of toothed wheels that the transmissio-nof power shall be perfectly free fromjolts, 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 condition, it is necessary that the teeth shall have a mathematically accurate profile. In practice, however, such construction is almost impossible especially in the case of wheels which are hardened after manufacture.

This application is a division of applicants application No. 665,895, filed December 15, 1911. x

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 d uring mutual 1 is a side elevation; Fig. 2 is a section of the apparatus; Fig. 3 shows means for angularlydisplacing one -of the wheels undergoing grinding with relation to the other, and Figs. 4 to 7 are progressive views showing part of a pair of wheels undergoing tion.

grinding, the unground tooth surfaces being serrated merely to indicate roughness.

In the form illustrated the two toothed wheels at and b to be ground together, are mounted respectively on the shafts c and d. 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 72. for reversing the direction of rotation of the disk f with respect to the disk 6. This idle wheel h is pressed by the spring 2' against the disks f and g. A crank mechanism 70 is provided by means of which the shaft 0 and through it the toothed wheel a can be moved to and fro in the axial direc- The screw spindle Z serves the pur pose of moving the two axles c and d nearer to each other until the disks (3 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.

In order to allow of shifting the position of the toothed wheels relatively to their driving device, the wheel e for instance is fixed to the shaft cl by means of an interposed worm drive p in such a manner that by rotating the worm 7) a shifting of the wheel relative to the axis can be effected.

According to the above arrangement for the purpose of starting the process the axles of the 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 inthe axial direction by a separate driving device. This movement is mainly intended to effect thegrinding 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 object. in view in a perfect manner because under the influence of rotary motion alone relative movements of the teeth against one another l 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 to- 'gether' without. any play when finally shaped then at the termination of the operations teeth of ideal form will berproduced 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 a paratus is provided for the purpose of pro ucing 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 face 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 effecting this intimate contact, conveniently by rotating its shaft relatively to the driving means therefor. lhus 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 roaches 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 7 device of the two axles of the toothed wheels greater or smaller than the ratio between the toothed wheels to be ground in, and byv this means'a grinding away of one side or the other of the tooth profile can be efiected. This alteration of the ratio of thepair 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, friction disks, may 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. A method of mutually grinding toothed wheels or the like which consists in mounting two toothed wheels upon separate shafts, driving each of said shafts moving the wheelsinto mesh and supplying an abrasive to the same, as set forth.

2. A method of mutually grinding toothed wheels or the like which consists in mountin two toothed wheels upon separate to the same, and impartinglateral move ment to at least one of said wheels along the axis thereof, as set forth. I

3. A method of mutually grinding toothed wheels or the like which consists in mounting two toothed wheels upon separate shafts, driving each of said shafts moving the wheels into mesh, supplying an abrasive to the same, displacing one of the wheels about its axis relatively to its driving means, as and for the purpose described.

In testimony whereof I ailix my signature in presence of two witnesses.

ALBERT AICHELE;

Witnesses:

CARL GUBLER, Aueusr Runes.

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