US1767429A - Bearing mounting - Google Patents

Description

June 24, 1930. Q J BRITTAIN, JR" ET AL 1,767,429

BEARING MOUNTING Filed Aug. 14, 1923 2 Sheets-Sheet 1 l4 a2 20 43 I2. 44 Q 34 2028 30 at I6 36 24 5| 32 as 5O 54 7 I I2 I V W I V m W emvmrcw; 2d Bril/ain, Jr, and P H Hula/2172.500,

e R. J. BRITTAIN, JR., 1,767,429

BEARING MOUNTING Filed Aug. 14, 1923 2 Sheets-Sheet 2 lwoewtow: Q J Brill-91h, Jr; and 1 I0. H. Ha/cbinsan dim 2,44%.

Patented June 24, 1930 UNITED STATES PATENT. OFFICE RICHARD J. BBITTAIN, JR, AND PHILIP H. HUTCHINSON, OF EAST ORANGE, NEW JERSEY, ASSIGNOBS TO GENERAL "MOTORS CORPORATION; 01 DETROIT, MICHIGAN,

A. CORPORATION OF DELAWARE ammo notmrme Application filed August 14, 1923. Serial no. 657,278.

This invention relates to bearing mountings and is herein shown as embodied in a bearing mounting for the grinding wheel spindle of an internal grinding machine.

High speed spindles, such as those for internal grinding wheels and the like, must run true, without any chattering or wobbling and without distortion caused by pressure of the grinding wheel against the work or caused by belt pull at the pulley end of m the spindle. Hence the bearing mounting must be of a compensating nature to allow for expansion and contraction when the parts get hot, all looseness due to wear should be prevented, and the spindle should 1 be as ri 'dl su ported as ossible if accu- 5 rate woi l r i 'to done. 11, object of the invention, therefore, is to provide a mounting for such spindles which will efiiciently meet the above and other requirements.

Another object is to provide a mounting for an internal grinding wheel spindle which will enable the wheel to be worn down to a smaller diameter without sacri ficing stiffness in its support. Still another object is to provide improved means to eliminate distortion of the spindle and wear on the bearing. Yet another object is to provide a simple, easily asesmbled and.inexpensive bearing mounting to meet the spei so cial requirements of a tool spindle and one which will utilize standard roller bearings. To these ends, and also to improve generally upon devices of the character indicated, our invention consists in the various matters hereinafter described and claimed.

In the drawings, Figure 1 is a vertical section of one embodiment of the invention. Figure 2 is a top plan view. I Figure 3-is a vertical section of another embodiment of the invention. 2

. Figure 4 isa sectionon the line Figure 3.

Figure 5 is a vertical section of another form of the invention.

Figure 6 is a section on the line 6-6 Fi re 5.

igure 7 is a vertical section of still another form of the invention.

Figure. 8 is a front-elevation, partly in verc'ltical section, of the spindle drive means an Figure 9 is an end view of Figure 8.

Referring first to Figures 1 and 2, the numeral 10 designates a sleeve or quill surrounding a spindle12having its ends reduced and one end carrying a tool, here shown as a grinding wheel 14, and the other end having driving means such as a belt pulley 16. Against a shoulder 18 on the spindle are clamped two inner race rings or bearing cones 20 separated by a spacing ring 22 and confined against moveme nt relatively to the spindle by a nut 24 threaded on the spindle. Balls are confined between the inner race rings 20 and outer race rings or bearing clips 26 which are in alignment with the inner rings and have their thrust faces between the rows of balls and facing outwardly. Between the outer race rings 26 are interposed spreading rings 28 having oppositely inclined faces 30 and circular lips 31 which extend inside of the outer race rings to form a su port. Bearing a ainst the inclined faces 0? the rings is a coil contractile spring 32, this being a helically wound spring in the form of a ring which constantl tends to ap roach the center of the spin e and thus orces the outer race rings apart to take up wear and prevent any looseness in the bearing.

The end of the sleeve 10 is closed by a nut 34 threaded therein and having a smooth cylindrical opening in which rotates the reduced end of the spindle 12, said spindle having right and left threads 36 thereon, the apexes of the threads closely fitting the bore in the nut. The threads act as a pum to retain lubricant in the bearing and exc ude grit from the bearing. The sleeve 10 is artcut away or reduced at .38 (see Figure 9o 2), more of the material being removed from the side where the grinding wheel contacts with the work and the opposite thicker portion or wall 40 taking the load due to the pressure of the grinding wheel against the work. With this construction, the grinding wheel can be used on deep, hollow articles until'its diameter is worn down smaller than the distance from the center ofthe spindle to the outside of the thicker portion 40 of the sleeve, without interference of the sleeve or quill with the work and without sacrifice of stiffness in the bearing. The bearing can float longitudinally if there is any unequal expansion or contraction of the sleeve and the spindle, and the sleeve has a long cylindrical recess .42 extending nearly to the middle of its length whereby, when the grinding wheel is off of the spindle, the spindle and bearing may be slid to the right for the purpose of assembling the bearing at the other end which will presently be described. Thus the bearing sleeve has a substantially centralthickened portion closely surrounding the spindle and end recesses of larger diameter spaced further from the shaft to receive the bearings. The sleeve is thereby stiffened and one bearing is kept housed and undisturbed on the spindle which is maintained concentric with the sleeve when the other bearing is exposed outside its recess. L

The other end of the sleeve 10 hastwo cylindrical recesses of different diameters joined by a shoulder 44 and, fitting within the recess of larger diameter, is a sleeve 46 having a circular lip or flange 48 extending inwardly towards the spindle and also having an inclined face corresponding to an inclined face oh a ring 50 which is similar to the rings 28 above described. A coil spring 52 similar to the spring 32 engages the inclined faces and tends to move one of the outer race rings 54 relatively to the other, said other fittlng the inner surface of the sleeve 46 and abutting the circular lip 48,

- thereon. The inner race rings 56 at this end are confined on the spindle like those at the other end. A nut 58 threaded in the sleeve 10 holds the sleeve 46 firmly, against the shoulder 44. Thus, one spindle bearing can float longitudinally and the other is fixed but nevertheless has .means to take up wear and prevent looseness. The cup members have straight peripheries, laterally, to give extended support between them and the casing 10, and at least one cup member in each set of spaced bearings is in slidable engagement with the casing. Standard single row bearings can be used and no special or diflicult machining operations are required.

In the form shown in Figures 3 and 4, the inner race rings are clamped b a nut 60 as before but the spacing ring 62 is shorter than in the other form because the outer .of the outer race rings 64. The other end of the sleeve is engaged by inclined faces on a number of wedge members 72 which are inserted radially through the sleeve 10 in positions spaced (preferably 120 apart) around the sleeve. The wedge members are pressed inwardly by springs 74 backed up by plugs-76 threaded in the sleeve 10. The

inclines on the wedge members are steep.

enough to be a locking angle such that any endwise thrust transmitted by the bearing to the sleeve will be taken up without moving the wedge members. At the other end of the sleeve 10 is a set of inner race ringssimilar to those heretofore described and the outer race rings 78 have interposed between them rings 80 with oppositely in.- clined faces engaged by a spring 82 similar to the spring 32 shown in Figure 1. This is the bearing that floats whereas the bearing at the other end is fixed against any longitudinal movement although there is the provisionfor taln'ng up wear.

Referring to Figures 5 and 6, this hearing is similar to that shown at the right hand end of Figure 3 but the inclined faces on the rings 84 are engaged by opposite, inclined faces on wedge members or plungers 86 which slide radially in the sleeve 10 and are engaged by springs 88 backed up by the threaded plugs 90.

Referring to Figure 7, spaced outer race rings 92 are assembled with their thrust faces on the outside of the balls and a ring 94, supported by one of these race rings,

has an lnclined face engaged by corresponding inclined faces on each of a series of wedge members 96. One 'side of each wedge member is flat and radiall there is no possibility of tlie member becoming canted in the opening in which it slides. A nut 98 threaded on the spindle holds the inner race rings in place and, on the outside, it is provided with right and left threads 100 fitting a circular bore on the inside of a nut 102 which is threaded in the sleeve and holds one of the outer race rings against movement. By this construction, in which the nut 98 is inside of the other nut which closes the sleeve, the bearing can be placed closer to the point where the strain comes on the spindle, such as the belt pull in this figure or grinding wheel pressure if such a bearing is used at the other end.

Figures 8 and 9 show how the sleeve or disposed so that i tering a cross slot in the end of a driving shaft 114. Fixed to the shaft 114, is a driving pulley 116 at each side of which, on the shaft, are right and left threads 118 fitting a smooth portion in inwardly extending flanges on sleeves 120and 122. Within each sleeve is a single row bearing, each having its inner race ring clamped in position by a nut 124 threaded on the shaft and having right and left threads on the outside fitting a smooth bore in a nut 126. An outer race ring 128 in sleeve 120 is held against movement in one direction by the inwardly extending flange on the sleeve 120 and the outer race ring 130 in the other sleeve 122 is slidably mounted and carries a ring132 with an inclined face engaged by corresponding inclined faces on a set of wedge members 134 which are mounted in a manner similar to the wedge members 96 of Figure 7. The

sleeves 120 and 122 are supported in boxes 136 which have openings 138 extending radially therethrough to admit lubrlcant to similar openings through the sleeves and communicating with the bearings.

Although the invention has been described by reference to certain specific embodiments thereof, it should be understood that it IS not necessarily limited in its broader aspects, to the specific structure selected for lllustrative purposes.

\Ve claim:

1. In a device of the character indicated; the combination with a tool-carrying, rotary spindle, and a stationary casing in Wl1l0h said spindle is rotatably mounted, said casing being diametrically reduced at one s de only, whereby the tool carried by the sp ndle projects diametrically a greater distance beyond one side of said casing than the other, and said, other side of the cas ng affords maximum casing-body to res1st the working strain upon the tool; substantially. as described.

2. In apparatus of the character described, a spindle having a working tool at one end and driving means at the other end, a bearing sleeve having a substantially central thickened reinforcing portion closely surrounding the. spindle and end recesses of larger diameter spaced further from the spindle, the ends of the splndle being reduced to receive inner race rings, 1nner race rings clamped on said reduced ends,

outer race rings mounted in the enlarged end recesses of the sleeve for sliding movement axially in both directions, rolling elements between the inner and outer race rings, one of the end recesses being extended axially beyond its bearing. to the reinforced central portion of the sleeve to keep said bearing housed and undisturbed on its spindle and to support the spindle concentrically with the sleeve when the spindle and said bearing are moved axially to ex pose the other bearing; substantially asdescribed.

3. In apparatus of the character described, a spindle, a sleeve surrounding the spindle, series of rolling elements, the spindle having means near one end for constiv tuting a pair of spaced raceways for the series of rolling elements, spaced outer race rings slidably fitting the inner surface of the sleeve and having angular contact raceways for the rolling elements, a pair of spreading rings between said outer race rings and each having a circular supporting lip extended inside of the adjacent outer race ring, said spreading rings having their adacent faces oppositely inclined, and a helically wound sprlng arranged in the form.

of a ring for engaging the inclined faces of the spreading rings; substantially as described. i

1. In apparatus of the character described, a sleeve having a bore, a pair of outer race rings in the bore, at least one of said rings being fitted to slide axially in the bore and beingaxially spaced from the companion race ring, a spindle in the bore, a pair of inner race rings secured on the spindle in spaced relation, rolling elements between the inner and outer race rings, a pair of rings spaced apart and inserted between the ends of the outer race rings, the rings engaging the ends of the'outer race rings and-having their adjacent faces oppositely inclined and converging towards the spindle, and a spring member between the rings, the spring member engaging the inclined faces and constantly pressing towards the spindle to exert a continuous pressure tending to separate the outer race rings and keep the rolling elements on'their raceways; substantially as described.

5. In a device of the character described,

a sleeve, a spindle extending through the larly spaced apart, spring means between each pair of spaced outer race rings to keep the slidable ring yieldably pressed axially in a direction to constantly hold the parts of the respective bearings in close assemblage with provision for expansion of the spindle, and the spaced apart relation of each pair of race rings giving the spindle extended support at a plurality of places near each end of the sleeve; substantially as described.

In testimony whereof we hereunto aflix our signatures.

RICHARD J. BRITTAIN, J R. PHILIP H. HUTCHINSON.

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