Blade for liquid friction couplings

A blade for liquid friction couplings consists of a disc (1), which is formed in its effective end faces with a plurality of substantially radially extending interruptions (4, 4'). To increase the torque limit without a loss of strength and without an increase of the blade spacing, the interruptions consist of grooves (4, 4'). The grooves (4) on one end face are staggered from the grooves (4') on the other end face.

Referring to FIGS. 1 and 2, a so-called inner blade 1, which is 
non-rotatably connected to the shaft section of the liquid friction 
coupling, is provided with a serrated portion 2 for making said connection 
and is provided at its periphery with apertures 3, which facilitate the 
filling of the housing of the coupling. The blade 1 is formed on its two 
effective end faces with a plurality of radially extending interruptions, 
which consists of grooves 4, 4'. The grooves 4 of one end face are 
staggered from the grooves 4' on the other end face. The blade 1 is a 
substantially flat disc. 
A liquid friction coupling 10 in accordance with the present invention is 
illustrated in FIG. 3. The liquid friction coupling 10 has multiple inner 
blades 1 non-rotatably connected to a shaft of the liquid friction 
coupling by means of longitudinal ribs 12. Multiple outer blades 5 similar 
to inner blades 1 are connected to the liquid friction coupling housing by 
means of longitudinal ribs 14. A viscous fluid fills the housing. Inner 
blades 1 and outer blades 5 both are provided with grooves 4, 4' on their 
respective faces, the grooves 4 of one face being staggered from the 
grooves for 4' on the other face. Corresponding faces of inner blades 1 
and outer blades 5 are in confronting relationship with each other with 
the viscous fluid between the confronting faces. 
While the invention has been described by reference to specific examples, 
this was for purposes of illustration only and should not be construed to 
limit the spirit or scope of the invention.