Elastic rotary coupling, particularly for the driving of rpm regulators associated with fuel injection pumps

Claim 1

An elastic rotary soft coupling arrangement comprising A. a driving component; B. a driven component disposed coaxially with Respect to said driving component, C. recesses provided in said driving and driven components, at least one recess in said driving component and at least one recess in said driven component forming an aligned pair and constituting a nest, D. an elastic coupling element received in said nest and occupying, when in stress-free condition as a result of not rotating, one part of the volume enclosed by said nest, said elastic coupling element having a cross section in the approximate shape of an elongate rectangle having a length dimension oriented approximately tangentially to the direction of rotation of said coupling, said rectangle having rounded corners and slightly depressed sides, and said elastic coupling element being exposed along its longitudinal axis and its diagonal axis to compression and then shearing stresses upon rotation thereof, the small cross-sectional portions of said elastic coupling element being firstly subjected to compression, E. a cavity provided in a face of said driven component adjoining said driving component, said cavity having side walls and F. a coupling lug affixed to said driving member and extending into said cavity, said coupling lug being out of contact with either side wall during normal operation, the position of said coupling lug between said side walls being freely changeable as a function of the deformation of said elastic coupling element.