Fluid Coupling

  • Overview
  • Fluid Coupling is Ideally suitable for smooth and jerk less start and also act as energy saver. When the fluid coupling is filled with oil to the appropriate level and the motor is switched on, oil in the passages between the vanes of the impeller is accelerated radially outwards gaining energy all the time until it reaches the maximum circuit diameter. The oil then passes from the impeller to the runner in which it is forced to move inwards between the vanes and as its radial velocity falls energy is transferred to the runner and output shaft. Because the oil passes directly from the impeller to the runner, (there is no reaction member, as in a torque converter), the efficiency is high, with full load slips of between 2 and 5 % being achieved in practice and depending on the application and size selection.

    Wind age and oil circulation losses are negligible therefore efficiency equals 100% slip %. Should an overload occur the fluid coupling will stall, i.e. slip 100 % at a torque value determined by the initial oil filling level. Thus motor and machine are both protected.

  • Technical Specification
  • Type           CD                      Without delayed filling chamber

                      CDR                    With delayed filling chamber

                      CDRP                  With extended delayed filling chamber

                      CDRS                  With extended delayed filling chamber
                                                 & controlled nozzle

                      CDIR                  Reversed coupling with delayed
                                                 filling chamber

                   – R + ED               Fluid coupling with gear coupling
                                                (Radially removable)

    Size           185 to 760

    Rating        1.5 to 950 kW
                      at 1450 RPM

  • Features

    The level of performance achieved by Fluid Coupling is governed mainly by the design of its working circuit which includes the shape of the circuit, number of vanes in the circuit, the vanes placement etc. The working circuit developed by Elecon is out of number of years of experience in the field and is vital in the performance of the fluid coupling. Elecon Fluid couplings are very rugged in construction, simple in design and reliable in operation. 



    When Elecon fluid coupling is connected to the drive system it allows the motor to start practically at no load. This results in reduced starting current enabling quick start and acceleration of the drive motor.



    It gives gradual start to driven equipment and thus provides smooth and shockless transmission.



    Driving and driven equipments suffer less wear and tear and thus there is reduction in electrical and mechanical maintenance cost.



    In case of overload, accidental jamming, the transmission torque is limited by the fluid coupling and thereby providing protection to the electric motor and the connected machine. In case of extended jamming period, fusible plug blow off will empty the fluid coupling thereby disconnecting the output from the input, and protecting both driving and driven equipment. To prevent the loss of oil and to have an additional safety device, thermal trig switch can be provided when demanded in addition to the fusible plug.


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