Tollok Mechanical locking bushes

Mechanical keyless shaft to hub connections

Tollok S.p.A are a leading manufacturer of locking bushes with plants in Italy and the USA.  Their wide range allows these friction connections to replace keyways in all industrial machinery.
General purpose locking bush
Shrink disc locking bush
Tollock rigid coupling

General purpose locking bushes product information>>

Tollok general purpose bushings cover a variety of mechanical designs with varying features.  The TLK110 suits hubs with small outside diameters.  The TLK 400 to 451 are designed for high torques and high radial loads such as may be encountered with mounting of rolls. Other deciding factors are whether axial movement during fixing is acceptable, and whether the hub is self-centred.
See the Quick selector for main models.

Types TLK110, TLK130, TLK131, TLK132, TLK132, TLK133, TLK134, TLK139, TLK200, TLK350, TLK400, TLK401, TLK450, TLK451.

Shrink disc locking bush compression couplings
product information>>

Shrink disc locking bushings are often found in gearbox outputs where a thin walled hollow output shaft is clamped onto a male shaft by the bush.  This results in high concentricity and high transmitted torques.  The shrink disc compression couping located outside of the hollow shaft so access is easy, although radial space is required.

Types TLK601, TLK602, TLK603, TLK622, TLK623, TLK681,TLK683.

Other designs locking bushes product information>>

The TLK250 and 250L are simple low cost locking bushes where setting is achieved by tightening a single radial nut.  Tightening torques can be high and precise settings difficult to achieve.  The type TLK300 is a pair of matching cones that need to be integrated into a machine design.   The TLK 500 is a rigid joint to connect two shafts of equal diameter without misalignment.

Types TLK250 light duty, TLK300 cones and TLK500 rigid joints

Tollok mechanical locking bushes give many advantages compared to conventional keyway connections.  Machining of the shaft and hub is easier with only a turned finish required.  The stress raising corners of the keyway are eliminated giving a longer life or permitting a smaller shaft to be used.  Mechanical locking bushes are free of backlash so there is no fretting on reversing drives.

The ability to set the hub position radially and axially is an obvious advantage of locking assemblies.  They accept both torque and axial loads so there is no need for shaft steps or collars.  They can be dismantled and reused.

 

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Tollok locking assemblies, also known as bushings, part of the Techdrives range, connect all sorts of hubs, sprockets, pulleys and gears to shafts without keyways, splines, circlips or collars.  The connection is backlash free without fretting and can easily be dismantled and re-used.  Locking bushes are also known as locking assemblies, locking elements, friction joints and bushings.

Locking bushes use precision cones to transmit forces.  Clamping screws draw the cones together.  As they ride over each other, the outer cone expands and grips the hub.  Similarly the inner cone contracts to grip the shaft.  When fully mounted the Tollok makes a backlash-free and torsionally rigid connection between hub and shaft.

A wide range of locking bush models suit different requirements.  The choice depends on the mounting dimensions, the level of torque required and whether the connection needs to be self-centring.
Download
Locking bush 21 page product
catalogue (1.2MB)

CAD drawings
Go to product pages and click on the dxD dimension required or torque value.