US1525336A

US1525336A - Means for grinding the mantle surfaces of rollers having arc-shaped generatrices

Info

Publication number: US1525336A
Application number: US415516A
Authority: US
Inventors: Victor A Svensson
Original assignee: SKF AB
Current assignee: SKF AB
Priority date: 1920-10-08
Filing date: 1920-10-08
Publication date: 1925-02-03
Anticipated expiration: 1942-02-03

Description

Yeh 3, 125.

1,525,336 v. A. svENssoN MEANS FOR GRINDIANCT THE MAN'IILE SURF C F ROLLERS HAVI G ARC SHAPED GENERA C Fi d OGL. 920

/N VEA/TOR.

Patented F eb. 3, 1925.

UNITED STATES y. 1,525,336 PATENT 'oFFicEg VICTOR A. SVNSSON, OF BROOKLYN, NEW YORK, ASSIGNOR NTO AKTIEBOLAGET SVENSKA-KULLAGERFABRIKEN, OF GOTTENBORG, SWEDEN, A. CORPORATION OF SWEDEN.

MANSFOR GRI'IINDING THE MANTLE SURFACES 0F 'HAVING ARG-SHAPED To all whom 'it may concern:

Be it known that I, VICTOR ABRAHAM SvENssoN, a subject of the King of Sweden, residing at the city of New York, borough of Brooklyn,l county of Kings, and State of New York, have invented certain new and useful Improved Means for Grinding the Mantle Surfaces o'f Rollers Having Arc- Shaped Generatrices, of which the "following is a specification, reference being had therein to the accompanying drawings.

This invention relates to an improved f means for grinding the mantle surfaces of rollers having arc-shaped generatrix by means of a grinding disc rotatable in rela- .tion to the rollers. rl`he object of the invention is to secure an effective, quick, and exact grinding of Cil such surfaces/with the aid of simple means in such manner that the generatrix ofthe rollers Will be an exact arc of a circle independent of Whether `the working surface of the grinding disc ,has a corresponding exact form or not.v

The invention consists, chiefly, in this that the rollers during the grinding operation are brought to roll in such positions that the outermost generatrices of their mantle surfaces always are contained ina spherical surface, and that the grinding is performed by means of al grinding disc, the Working surface of which is preferably 'formed in accoidancewith said spherical' surface and the axis of rotation of which forms an angle with the axis of the roller race.

ln Vthe accompanying drawings Fig. l illustrates the grinding of the mantle surfaces of rollers having convex arc-shapedA y generatrix, Fig. 2 illustrates the grinding of .concave mantle surfaces. Similar letters refer to corresponding parts in both embodiments. y

Referring to Fig. l of the drawings,l 1 is the grind-ing disc which is secured to aA rotary shaft 2. The rollers 3 the convex mantle surfaces of which are to be ground, are mounted in a roller cage or retainer 4: said retainer or cage being secured to a rotary shaft 5 the axis of which forms an angle withn the axis of the grinding disc. The axes of the

shafts

2 and 5 intersect one another in a point 0 being the centre of the outermost generatries of the rollers LApplication led Octcher 8, 1920. Serial No. 415,516.

, the radius of curvature of said gencratrices being R. The roller cage 4 is of such form and arrangement that the rollers during the -grinding operation can rotate about their -respect of their transversal middle planes the point of-intersection will be positioned at a distance from the centre 0, as for instance at a. lf, on5 the contrary, the rollers *are symmetrical in relation to their transversal middle planes, the retainer 4 is to be constructed in 'such manner that said middle planes pass through the centre 0.

During the grinding operation the grinding disc is rapidly rotated about its own axis while the roller cage and the rollers mounted therein rotate about the axis of the cage, preferably with a speed which is independent. of and slower than that of the grinding disc. On account thereof each point of the outermostgeneratrices of the rollers will come` in contact with different points of the working surface of the grinding disc, the result being that the f/said Working surface maintains its spherical form in spitepof its wear and that the generatrices ofthe rollers become exact circular arcs having .their centre in 0. i

Fig. 2 illustrates the grinding of rollers having concave mantle surfaces which are symmetrical in respect of their transversal middle planes. The working surface of the grinding disc 1 is here convex and positioned between the centre O and the rollers 3, wheretate about the axis of the shaft 5 which'intersects the axis of fthe shaft 2 in the point j' 0. farming the @entre of the butermost gener:

are R, and at Vthe same time the rollers rotate about their own axes 6 in theroller;

cage. f

s the grinding disc is Worn it is fed towards the point 0 by means of any Wel]- known automatic feeding device in such manner that its Working surface maintains a const-ant distance from said centre.

It is evident that the movements above describe-cl are not absolute but relative only. Accordingly, it Would be ossible to use Va stationary grinding disc the roller cage is rotated about its own axis as Well as about the axis of the/ grinding disc.

What I claim is: y

l. The combination, fin a machine dfor grinding rollers Whose periphery has an arcshaped generatrix, of a rotating grinder having an annular spllierica-llly curved grindingy surface and a fixed axis 'of rotation, and a Work-,holder rotating on an axis at an angle to the grinder axis and havingan annular raceway shaped to receive the rollers and permit theln to rotate individually about theirf geometrical axis While being-ground. 2. The combination,` in a machine for grinding rollers Whose periphery has an arcshaped generatrix, of an annular rotating grinder having a spherical grinding surface andra. xed axis of rotation, and a Workholder of corresponding contour rotating on an axis atan angle to the grinder axis and having in its peripheral face an annular raceway shaped to receive the rollers and permit them to rotate individually about their geometrical axis While being ground.

n testimony whereof Iliave signed my name. Y i Y o VICTOR A. SVENSSON.