USRE22485E - Sheave - Google Patents

Description

E. J. OTTO I May 23, 1944.

SHEAVE Original Filed Oct. 29, 1942 4 Wm 5%. .W

Reiuued May 23,

snnavs Eugene J. Otto, Milwaukee, Wis., assignor to Allis- Chalmers Manufacturing Company, Milwaukee, Wis., a corporation of Delaware Original No. 2,331,498, dated October 12, 1943, Serial No. 463,768, October 29, 1942. Application for reissue 522,02'1- February 11, 1944, .Serial No."

8 Claims. (Cl. 287-5236) This invention relates. to improvements in power transmission units in which a sheave or other driving or driven member is attached to a shaft in driving or driven relation.

It is an object of the invention to provide a demountable sheave and split sleeve unit easily and quickly assembled to or removable as a unit from, the shaft;

Another object is to provide an assembly in which the parts when unclamped, are held together by a snap ring:

Another object is to provide such an assembly in which the. clamping force acts between two solid rings, and no large split flange meniber is necessary, minimum radius to avoid warping tendency;

Another object is to provide an assembly which is light in weight and inexpensive to manufacture;

Still other advantages will be apparent from an inspection of the description herein, and the drawing, in which: a

Fig. l is a cross sectional view of the sheave assembly clamped on the shaft, taken'on line 1-1 of Fig. 3;

Fig. 2 is a cross sectional view taken on the line IIII of Fig. 3 with the shaft removed;

Fig. 3 is a front elevation view of the assembly; and

Fig. 4 is a view similar to Fig. 1, but with the shaft removed and the sheave in loosened position with the hub-starting bolts in place.

Similar numerals refer two holes I are formed in the end face, parallel to the axis and at diametrically opposite points. These holes. are tapped to receive hub starting screws, or bolts 8, the use of which will be de scribed hereinafter.

Mounted directly on shaft 9 is a sleeve Iii centrally bored to asliding fit on shaft 9 and split throughout its length along a substantially radial plane or a plane parallel to the axis of said sleeve, by a sawed or milled cut as at H, the

forces on the split sleeve acting at a split or out being of suflicient width orcircumferential extent to permit the sleeve III to be contracted by clamping. to tightly grip the shaft 9. The outer surface of the sleeve I0 is divided into a tapered portion II, a radial shoulder I3 and a cylindrical portion ll. Portion ll may obto similar parts throughout the several views.

In the embodiment of the invention as shown viously be other than truly cylindrical, but is essentially a portion of reduced. size relative to the contiguous tapered of the shoulder i3 indicates. In thecylindrical portion a groove of rectangular section is formed at IS in which a split spring ring it may be assembled by expanding the ring, passing it over the end of the sleeve Iii, and allowing it to contract or spring into place in engagement with the groove. The outside diameter of the ring it is sufficiently greater than the diameter of the cylindrical portion ll of the sleeve that the rim: forms an abutment or the surface H when in place and in engagement with the sides and bottom of the groove l5.

Between the shoulder l3 and the ring it an annular member, or ring, I! having an inside diameter the same as the cylindrical portion ll of the sleeve may be mounted. The annular member I! may be rectangular in cross section and forms a demountable flange when in place, free to be rotated relative to the sleeve l0, but fixed against axial displacement relative to the sleeve by the shoulder I3 and ring ii. The annular member I1 is provided with axially extending threaded holes ll equally spaced around the circumference of the annular member, and having their axes at equal distance from the axis of said annular member and in alinement with the radial end face i In the embodiment shown in the drawing, there are three such holes I! in each of which may be mounted a clamping screw, shown as a headless screw is capable of extending through said annular member into operative engagement with the end face 6 of hub 4 for a purpos explained hereinafter. There also may be provided two plain axial holes 20 at diametrically opposite points of said'annular member so located as to be alineable with the holes I in the hub 4. Hub starting bolts I threaded to fit holes I in hub 4 and capable of extending freely through holes 20 in annular member I! may beprovided; of a length sufficient to accomplish the purpose described below in the description of operation of the invention. Bolts I are provided with heads 8' to engage the outer side of annular member ll when in position.

The shaft and the sleeve may be provided with portion, as the presence flange projecting above of the hub when assembled.

2 conventional key means indicated at 22, and the It should be noted that in assembly, the annutapered portion I! of the sleeve. and pered lei-member ll may be rotated to any desired bore 5 of the hub may also be provided with conventional key means as indicated at 23, said key means permitting relativ axial movement of said shaft, sleeve and hub, but preventing relative rotation thereof.

The embodiment of theinvention as described and shown in the drawing operates in the following manner. With all parts separated, assembly ismade by passing the tapered bore 5 of hub 4 over the cylindrical portion ll of sleeve it into keyed engagement with the tapered portion I! of said sleeve. Annular member i1 is then placed in position on cylindrical portion ll against shoulder I3. Split ring l6 may then be expanded, passed over snapped into place in the groove Hi to act as a retaining abutment axially fixing the position of the annular member. Clamping screws I! are now inserted in holes I! and screwed lightly into engagement with, or just short of engagement with, the endface iv of the hub. The entire sheave assembly I may now be slid ontothe end of shaft 9 in keyed relation and placed in the desired axial position. Screws I! may now be screwed tightly against hub face 6 and evenly set up forcing hub l to move axially against taper I2 and forcing split sleeve III to contract and grip shaft 9 as tightly as desired. The clamping action unites all the parts into a rigid power transmission unit as shown in Fig. 1, capable of serving in a belt drive transmission or any other similar transmission as gear, friction, chain, etc., as will be obvious to any person skilled inthe art.

The operation of removing the sheave assembly consists of retracting screws I! out of engagement with the face 6, thus loosening annular,

member II which may now be rotated on the sleeve portion ll to aline holes 20 with holes 1 in the hub l. Hub starting screws or bolts l are now inserted and threaded into holes I. The

the end of the sleeve and position, allowing the clamping screws ID to seat against different points in the hubface 5 each time the device is assembled on the shaft, avoiding undue wear and strain at certain points which would occur if the same points were always used as hearing points. Hub starting screws 8 should be removed for running.

It should also be noted that the clamping forces acting on thesl'eeve III, that is, the force on the tapered portion exerted by the hub, and the reaction on the annular member II which is transferred to the sleeve Ill-by the split ring it, ac at a minimum radius. Thus, the moments of forces tending. to warp or deform the sleeve in an axial plane are minimized.

The above description is illustrative only, the scope of the invention being limited only by the scope of the claims herein.

It is claimed and desired Patent:

1. In a shaft driving connection, a longitudinally split sleeve member having a tapered outer surface portion and a shaft engaging inner bore, a hub member having a tapered bore to fit said tapered portion, said sleeve member having a portion of reduced size adjacent one end of said tapered portion and a radial shoulder between said portion of reduced size and said ta-. pered portion, an annular member demountably engaging said portion of reduced size, means ento secure by Letters gaging said portion of reducedsize and spaced tive to said shoulder, clampingmeans operativebolts are too short to reach the bottom of holes I with the sheave in clamped position, and as the bolts are turned forcibly the heads take up against the outer surface of annular member I! and the hub I is started, loosened, or drawn free of, taper portion l! to the position as shown in Fig. 4, allowing the sleeve to relax its grip on shaft 9. The entire assembly may now be slid along the shaft, or removed, as a unit, or, if de sired, the snap ring may be removed and the annular member and hub demounted without removing the sleeve from the shaft and another sheave rim having the same size hub portion, but possibly a different sized rim may be substituted in an obvious manner. i i

The screws I! may be headless, as shown, and of just suflicient length so that they will be flush with or sunken within the body of annular member I! when in clamping position, Fig. 1, thus presenting no external protuberance to catch threads of material, or attendants clothing.

As an obvious but undesirable alternative, screws I! may be made with heads, in which case they take the form of bolts 8, and will serve as clamping screws, and when removed from holes ll, may also serve as hubstarting screws.

It is obvious that any other well knowntype of motion transmitting structure, not shown, such as lever, crank, sprocket, pinion, rotor, brake or clutch assembly, etc., having a tapered hub portion, may be substituted for the sheave member shown.

ly engaging said annular member and said hub member and capable of forcing said hub member onto said tapered portion, thereby clamping said hub member, sleeve member and shaft tightly together in driving relation.

2. A demountable shslft driving connection comprising a hub member having a. tapered bore, a longitudinally split tapered sleeve member fitting said tapered bore and said shaft, ringmeans, means securing said ring means on said sleeve member at the smaller end thereof in axially fixed relation, clamping means operably engaging said hub member and said ring means to force said hub member and ring means apart thereby forcing said hub member onto said sleeve member clamping said hub member, sleeve member and shaft in driving relation, said ring means having an outside diameter such that said hub member, sleeve member and ring means will be held against accidental disassembly in the absence of either or both of said clamping means and said shaft.

3. A clamping sleeve assembly having a longitudinally split sleeve with a cylindrical inner bore, the outer surface of said sleeve comprising a tapered portion, a cylindrical portion of reduced diameter adjacent the smaller end of said tapered portion and a radial shoulder, a peripheral groove in said cylindrical portion spaced from said shoulder, an annular member having an outer diameter substantially larger than the smaller end of said tapered portion rotatably mounted on said cylindrical portion of said sleeve between said shoulder and said groove, and snap ring means engageable with said groove extending radially beyond the'peripheral surface of said cylindrical portion to retain said annular member against axial displacement relative to said sleeve.

zasss 4. In a' demountable sheave unit for use on a power transmission shaft, a longitudinally split sleeve member adapted to be contracted about said shaft and having-its outer surface tapered for at least a portion of its length, a demountable hub member having a tapered bore fitting on the tapered surface of said sleeve member, a detachable annulus mounted on said sleeve member and secured in axially fixed relation thereto to provide for free radial contraction of said sleeve member about said shaft independently of said annulus, and clamping means operatively engaging said hub member and said annulus to force said hub member onto said tapered sur-; face, thereby causing said sleeve member to tightly engage said shaft;

5. In a shaft driving connection, a tapered split sleeve adapted for mounting on a shaft, a

groove in said cylindrical portionspaced from said shoulder, an annular member having an outer diameter substantially larger than the adjacent end of said tapered portion rotatably ative to said sleeve.

hub member having a tapered bore mounted on said sleeve, an annulus mounted on said sleeve in axially fixed relation, said sleeve being free for operative contraction about said shaft independently of said annulus, and means operatively engaging said hub member and said annulus to force relative axial movement of said hub member and said sleeve, thereby clamping said hub member, sleeve and shaft in driving relation.

6. A clamping sleeve assembly having a longitudinally split sleeve with a cylindrical inner bore, the outer surface of said sleeve comprising a tapered portion, a cylindrical portion of reduced diameter adjacent one end of said tapered portion and a radial shoulder, a peripheral 7. In a shaft connection, a longitudinally split sleeve member having its outer surface tapered for a portion of its length, an outer surface portion of reduced size adjacent one end of said tapered portion and joined thereto by a shoulder, said outer surface portion having' an annular recess therein, an annulus mounted on said portion of reduced size, and removable means engaged in said recess and engaging said annulus to retainsaid annulus against axial displacement relative to said shoulder.

8. A longitudinally split tapered sleeve memher having adjacent one end thereof a'portion of reduced size Joined to the tapered surface by a shoulder. a removable annulus mounted on said portion of reduced size, and means adapted to engage said sleeve and said annulus and to cooperate with said shoulder to limit axial movement of said annulus relative to said sleeve, said sleeve member being free for contraction independently of said annulus.

EUGENE J. OTTO.

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