182 



HANDBOOK OF MECHANICAL DESIGN 



SHAFT SEALS 



tion, the half-round groove is used 

 frequently, the effecti-veness of the 

 seal increasing with the number of 

 grooves, of which there should be 

 at least two. 



grease lubrica- Fig. 303. — Sometimes this type is 



used without sealing rings. 



Usually only 



groove with a cork or felt ring is 

 depended upon to perfect the seal. 

 The tapered walls tend to press the 

 sealing ring against the shaft. 



Fig. 305. — This design makes it 

 easy to replace the cork or felt 

 ring. In some instances, the depth 

 of the counterbore is doubled and 

 two rings are used. 



Fig. 306. — One method of applying 

 a simple leather seal. 



Fig. 307. — A simple design of 

 labyrinth seal. Centrifugal force 

 prevents the entrance of foreign 

 particles while grease or oil lubri- 

 cant on the shaft is thrown out- 

 ward, thus filling the labyrinth 

 opening. 



Fig. 308. Fig. 309. Fig. 310. — Addition of a slinger 



Figs. 308 and 309. — Labyrinth and groove seals can be combined for greater helps materially to prevent liquids 



effectiveness. finding their way through the seal. 



