SKF SHAFT COUPLINGS

OK Hydraulic Shaft Couplings

When using OK couplings for shaft connections, you are gaining beneit from the advantages of our powerful oil injection method Preparation of the shaft is simple There are no keyways to machine, no taper and no thrust ring.

When mounting OK coupling, a thin inner sleeve with a tapered outer diameter, slides onto the shaft A thick outer sleeve with a matching tapered inner surface, its onto the inner sleeve Ordinary mineral oil is then injected between the sleeves

A built-in hydraulic jack drives the outer sleeve up the taper of the inner sleeve When the outer sleeve has reached its inal position, an interference it is created just as if the outer sleeve had been heated and shrunk on But no heat is required, and the coupling can be removed as easily as it was mounted This powerful use of friction enables the OK coupling to transmit torque and axial loads over the entire area of the shaft There are no stress raisers at the keyway And no fretting when high shock or reversing loads exist.

With the OKC and OKF couplings, SKF presents benefits impossible to achieve with traditional couplings The simplicity of mounting and dismounting, and the high torque transmission capacity characterized by OK couplings, are achieved using a powerful friction joint The six stages below illustrate this principle Up till 2016 more than 50 000 couplings have been delivered for use in many various applications The OKC coupling has been on the market since the early 1940s OKC couplings are the standard for many well-known controllable pitch propeller manufacturers in the world, but are also used for other applications such as rolling mills, pumps, diesel engines, etc The OKF coupling was developed to create a simple connection between a cylindrical shaft and engines or gearboxes having a lange at the thrust shaft The OKF coupling is available with or without a built-in tool for mounting / dismounting Since the coupling is mounted on a cylindrical shaft and not Fixed by keyways, it can easily be adjusted axially and rotated to the desired position The OK coupling’s higher torque capacity is due to the entire contact surface transmitting torque, unlike that of conventional couplings Since there is no need for keyways, the dimensions of the shafts and couplings can be reduced The OK coupling ensures a simplified mounting and dismounting procedure Very large couplings, which previously could only be shrunk on after heating, can now be assembled cold with the OK method

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