186 



HANDBOOK OF MECHANICAL DESIGN 



SLEEVE-BEARING SEALS 



Leather 

 packings 



Fig. 338. Fig. 339. Fig. 340. 



Fig. 338. For retaining lubricant, the seal is assembled with the flanged leather projecting toward the bearing. 



The leather packing is clamped near the outer edge of the flange by the inner of two telescoping metal cups, a tight 

 jomt at the face being thereby assured. A garter-type spring compresses the leather about the shaft. Should 

 misalignment occur, the seal is maintained by virtue of the flexibility of the leather and garter spring. To dram 

 off the surplus oil passing the end of the bearing, a small hole is drilled in the casting connecting the reservoir. 



Fig. 339. Installation of double seal unit for retaining lubricant in bearing recess and for guarding against 



entrance of foreign material. The seal is of the same general construction as shown in Fig. 338 except that two 

 flanged leathers are mounted opposed to each other. 



Fig. 340. Used for the same general purposes as the arrangement shown in Fig. 339. The seal has but one 



garter spring for the oil-retention leather flange. The leather washer for dust exclusion shown at right has a beveled 

 lip which contacts the shaft. 



iLeaiher 

 ' packing 



Feh 

 pacl^ing 



Oil"'^ 

 return 

 hole 



Fig. 341. — Sometimes felt is 

 ■used on the dust-exclusion side of 

 the seal in place of leather shown 

 in Figs. 339 a,nd 340. Both sealing 

 materials are retained by spinning 

 the outer casing over the leather 

 clamping cup. 



Oil refurn 

 hole 



Fig. 342. — Where there is con- 

 siderable difference in the diam- 

 eters, the face of the shoulder thus 

 formed can be utilized as the seal- 

 ing surface. A soft ring of cork or 

 leather is beveled at the outer 

 surface as sho%vn. A flat spiral 

 spring, coiled to a greater diameter 

 than the hole in the sealing mate- 

 rial, expands the packing outward 

 against the beveled ring and wedges 

 it against the face of the shaft 

 shoulder. 



Corker 

 lealher 



Gorier ^l 

 spring 



Figs. JJ3 lo J4J inci 

 Courlesy of Lin i verso I 

 Oil- Seal Company 



Fig. 343. — Working on the same 

 wedging principle as that shown in 

 Fig. 342, except that the packing 

 is beveled on the inner surface and 

 is retained by a sheet metal flange. 

 The cork or leather sealing mate- 

 rial is compressed against the two 

 bearing surfaces by a garter spring 

 as shown. Seals shown here and 

 in Fig. 342 are limited to approxi- 

 mately Yii in. end play. 



