Transmission of high torques & axial loads

Using several locking assemblies in series high torques & axial loads can be transmitted.

Transmission of high peripheral forces

Several GSN 7012 locking assembles can be used in series, the transmissible torques and axial loads are added.

Economics & simple manufacture

Key & keyway machining costs are reduced.

Infinitely adjustable

Bosses and hubs can therefore be located and locked at any point of the shaft.

Unlimited application range

GSN 7012 lockin assembles are most suitable for securing all types of bosses and hubs on shaft and axles they efficiently replace shrink fits, key and polygon connections, splined shafts etc. These locking assembles are used for the connection of gearwheels, cahin sprockets, cams, cam plates, belt pulleys, brake drums, flywheels, couplings and clutches, shaft mounted gearing, flanges, track wheels, impellers, ship and aircraft propellers etc.

Perfect true running

Forming a frictional lock connection, GSN 7012 locking assembles have absolutely no play.

High fatigue strength under alternating torsional stress

Neither shaft nor hub have keyways. Thus notch effect is minimized and a high polar section modulus is at the disposal of the designer.

Easy mounting :

Mounting is easy, machining or fitting work is not required.

East removal :

Release the locking screws, and the GSN 7012 lacking assembles can be removed.

Freedom from wear :

Having no moving parts, GSN 7012 locking assembles can be fightened and released as often as required.

FITS, SURFACES

GSN 7012 locking assembles can bridge relatively large clearances without significant losses. All clearances between k-11 and h-11 resp. N11 and H11 are possible. However the difference between both deviation of normal dimensions should not exceed It 9 (with regard to d).

The running accuracy depends exclusively on the fit between shaft and hub bored as the claiming element has no centering effect/

The mean peak to valley height R on the pressure surfaces of shaft and hub should be Rs.5.16pm

INSTALLATION

Since the force is transmitted by contact pressure and friction between functional surfaces, condition of contact surfaces and proper tightening of the locking screws are of great importance (see point 1)

1. All contact surfaces including screw threads and screw head bearing surface, must be clean and slightly oiled. In this condition, the shaft, hub and Locking Assemblies are to be assembled.
   
2. Tighten locking screws lightly and along hub.
   
3. Tighten screws evenly in diametrically opposite sequence and do this in two or three stages up to the indicated tightening torque (T)
   
4. Re check lightening torque by applying it to all screws all the way around, when no screw will turn any more, the assembly is completed.

REMOVAL

1. Loosen locking screws in several stages and in diametrically opposite sequence
2. Now the loosened connection can be readjusted or dis-assembled.

If necessary, the front and rear thrust ring are to be dis-assembled as shown in fig 2 & 3 The removal threads have only 3-5 threads and are not suitable for high pulling forces. They are to be used only for removal of the Locking Assembly by means of pull out bolts.

Used Locking Assembles have to be cleaned and slightly oiled prior to installation and assembled according to fig 1 The special marked screws are to be fitted with a washer and placed in the holes of front thrust ring which have the pull out threads (d).

2.Do not interchange components of two Locking Assemblies.