US2182226A - Water pump packing - Google Patents

Description

Dec. 5, 1939. w, A E|SE 2,182,226

WATER PUMP PACKING Filed Nov. 18, 1936 IDQ ZZZZ/ff, @239 Too ' Patented Dec. 5, 1939 V UNITED STATES lZ ATENT OFFICE eral Motors Corporation, Detroit, Mich, a corporation of Delaware Application November 18, 1936, Serial No. 111,349 a '4 Claims.

This invention relates to water pump packings and particularly to the water pump packings associated with the water pump used in connection with the internal combustion engines of auto- ,5 motive vehicles.

It is the object of the invention to construct an inexpensive, efficient water 'pump packing which may be inserted on the water pump shaft as a unit and will need no further attention throughout the life of the automobile.

The invention consists essentially of a sleeve which surrounds the water pump shaft and is positioned between the two end bearings on which the shaft rotates. The sleeve has attached thereto at its two ends, packing elements which press inwardly against the shaft and outwardly against a cylinder which connects the two bearings. The seal is so arranged that the packing members thereof are constantly urged against the surfaces with which th'ey form the seal.

Experience has shown that a water pump shaft will not rotate perfectly on its axis in the two bearings but owing to the fact that a small amount of clearance is necessary between all shafts and their bearings, this small amount of clearance or play will enable the shaft to wabble as a whole about a point or center between the two bearings, the limit of the wabble being confined to the clearance between the shaft and bearings. This wabble of the shaft causes excessive wear on the usual type of packing and it is one of the objects of the invention to make a seal which will not be affected by shaft wabble. The seal is so designed that it will moveas a whole with the shaft as it wabbles or moves bodily.

On the drawing Figure 1 is a sectional view through the water pump and water pump drive of an internal comw bustion engine of an automotive vehicle.

Figure 2 is a sectional view through the water pump seal showing a modified form of the invention.

Figure 3 is an enlarged perspective view of the metallic sleeve of Figure 2. i

' Referring to the drawing, the numeral 2 indicates the cast water pump housing which has the inlet 4 which may be suitably curved and have an attaching flange (not shown) by means of which it is secured to the engine, block of the automotive vehicle. The housing or casting 2 is hollow as indicated at 6 and has the pump rotor 8 mounted therein. The housing is closed by the cover l0 secured in place by the machine bolts l2. The casting has an opening at one side in which there is mounted the bearing l4, in which there is rotatably received the water pump shaft I6. The hub ill of the rotor 8 is secured to the end of the shaft l6 by means of the key 20. The bearing l4 has the lubricant. groove 22 which mates with a lubricant groove 24 in the casting 2. A suitable grease cup (not shown) may be secured to the mouth of the passage 24.

A second casting (or forging) 26 has a flange 2B fitting against the outer side of the casting 2. The casting 26 is secured to the casting 2 by means of the machine bolts 30. The extremity of the member 26 has the bearing 32 mounted therein in which there is rotatably received the other end of the shaft 16. To the end of the shaft l6 there is secured the hub 34 of a fan 36 the blades of which are shown at 38. The hub 34 is secured to the shaftbymeans of the key 40 and the fan 36 is secured to the hub by means of the machine bolts 42.

Secured between the fan 36 and the hub 34 is the flange 44 of a cup shaped member 46 having a fan belt pulley 43 formed at the end thereof. The fan belt pulley 48 is grooved as shown and the fan belt 50 operates therein. The fanbelt 50 is driven from the engine in the usual way.

The twobearings l4 and 32 are spaced and have their adjacent extremities connected by a cylinder 52. The cylinder 52 fits over the ends of the bearings l4 and 32 and may be secured to the bearing H4 in liquid tight relation, butit preferably has a slip fit with both bearings.

Between the ends of the bearings I4 and 32 and inside the cylinder 52 the water pump seal 54 of the engine is applied. The seal includes the sleeve 56 the outer end of which is formed into an annular groove 58 in whichthere is received the packing 60. The packing 60, when'it is in the position shown in Figure 1, is tightly compressed and pushesoutwardly against the inside of the cylinder 52.

The other end of the sleeve 56 is tapered or formed into truncated cone shape as shown at 62 with the smaller end of the cone closer to the shaft l6. If desired, the sleeve-54 may be tapered for its entire length. A packing, element 64 fits between the shaft. in the'conical part 62 to form a water tight seal with the shaft- I 6. A follower 66 is positioned at the end of the packing 64 and is considerably smaller than the sleeve 54. A spring 68 is under compression and held between the follower 66 and a flanged rib 69 formed at the other end of the sleeve 56; The spring constantly urges the follower 66 u against the packing as to insure a tight fit and prevent the leakage of-water.

The operation of,the seal is as follows: as the pump draws the water from the inlet and forces it out at the outlet the space i in which the rotor 8 operates is full of waterand in time a slight leakage may occur between the shaft 16 and the hearing it. The water will reach the end of,

' the bearing l4 and will be preventedfrom going seal formed by the packing so with the inside any farther because of the water seal formed by the packing 60 with the shaft l6 and the second of the cylinder 52.

Figure 2 shows a different type of seal but accomplishes the same object. Except for the different type of seal, the parts are the same.

" The sleeve 56' is best shown in perspective in Figure 3 and comprises the center solid cylindrical part Iii, the wide end part I2 and the narrounding it there is formed the packing. iii). The

packing 8Ii has the flat peripheral outer part 82, and the inner cylindricalv part 84, which press against the inside of the cylinder 52, and against the outside or the shaft Iii-respectively, to form a water tight seal. The packing or fabric 80 surrounds the element 56' and the water pump shaft and is impermeable to water and because pf the spring tension of the fingers I6 and I8 the flat cylindrical part 82 is pressed ,Outwardly against the cylinder 52 and the inner cylindrical spring fingers It to expand hold the packing part 14 is pressed inwardly against'the Shaft to form a water tight seal. When thecompleted packing as shown in Figure 2 is slipped over the shaft, the fingers I8 are spread and their spring tension urges them toward the shaft. .On the other hand, the forcing of the fingers I6 and the 1 part 82 in the cylinder 52 compresses the fingers I8 and the packing so that the tendency of the tightly againsbthe inside of the cylinder 52.

; bling movement." The conical end 62 will de- .In the species of Figure 1 the metallic sleeve 56 is capable of following the. wabbling or vbodily movements of the shaft I]. The packing 60 at the one end maybe considered as the pivotal part for the, conical end 62. Whenthe shaft i8 wabbles thesealll'will partake of the webscribe the 'shafts movement and rnove about-the interface betweenthe packing GI and the interior ofthe cylinder 52 as a fulcrunn In thus enabling1theseal as awholeto move bodilywith the no excessive pressure of the packing it against the shaft 16 is required. In applying the packing 84, its inside diameter is made the .same as or slightly larger than the diameter of the shaft so as. not to have a great pressiire,-'for the inherent ability of a packing V itself within narrow limits-to the shape of its.

confining-walls will enable the packing lightly to contact the shaft after a short-'period-of use. The lightpressure of the spring 68 on the fol lower as m e hteih this light pressure con act aisaaac between the packing 6t and the shaft it and prevent the burning out of the packing due to excessive friction between the shaft and packing. The species of Figure 2 has the same characterstics. The end at 86 will partake of the webbling movement of the shaft I6, pivoting or moving about the contact face at 82. I claim:

1. In a water pump seal, a rotatable shaft, spaced hearings in which the shaft rotates. a cylinder fitting over both bearings, said seal being positionedbetween said bearings to prevent water from passing beyond one of the bearings, said seal comprising an elongated metal sleeve sur-" rounding the shaft and enclosed by the cylinder, a groove at one end of the sleeve, a packing in the groove bearing against the inside of the cylinder, packing in the sleeve at the other end thereof, and means in the sleeve and retained thereby and wedging said packing between the ing positioned between'saidbearings to prevent I water from passing beyond one of thebearlngs,

said seal comprising an elongated metal sleeve surrounding the shaft and enclosed by the cylinder, a groove at one end of the sleeve, packing in the groove bearing against the inside of the cylinder, theother end of said sleeve having a conical shape, packing in the cone between the sleeve and the shaft, and aspring' in the sleeve and retained thereby and constantly wedging the last named packing between the shaft and the cone to form a water tight seal.

3. In a water pump seal; a rotatable shaft, spaced hearings in, which the shaft rotates, a cylinder fitting over the ends of both bearings, said sealbeing positioned in the cylinder and between the bearings to prevent water frompassing beyond one ofthe bearings and comprising an elongated tapered sleeve, a packing surrounding the sleeve, said sleeve being positioned be- -tween the bearings and surrounding the shaft and enclosed by the cylinder, the larger end of said sleeve and packing bearing against the inside of the cylinder, the smaller end of said sleeve and packing bearing against'the shaft to form water tight seals, the metal of said. sleeve being solidand the ends ofsaid sleeve being formed into fingers to give-a spring action thereto to'cause the packing'to be tightly pressed against the cylinder and shaft.

.4..In a' water pump seal, a. rotatable shaft, spaced hearings in which the shaft rotates, a

- cylinder fitting over the ends of bothbearings,

said seal being positioned in the cylinderand between the bearings-to prevent water frompassing beyond one of the bearings and comprising a sleeve surrounding the shaft and enclosed by the cylinder, the ends of said sleeve being formed into spring fingers. said fingers being outwardly bent at one end'and inwardly bent at the other end ofth'e sleeve, a packing surrounding and enclosing the sleeve, the largerend of the packing and sleeve pressing tightly against the insideof the cylinder, the smallerv end of the sleeve and packing pressing tightly against the shaft, 5

wen-eh A. onrsn.

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