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Features
Applications
Features:
Applications:
Features
Applications
Features
Construction
Applications
DM series direct mounting sprag clutches are specifically designed for use as backstops in applications where compact dimensions are required.
The clutch is designed to fit in a housing with the shaft as the inner race. This type is particularly suitable for use in gear units and similar equipment where good concentricity between shaft and housing is ensured.
Features
Applications
RenoldSprag clutch Holdbacks with Central Torque Arms are self contained units ready for mounting on the headshafts, or other suitable driving shafts, of inclined conveyors or elevators to prevent run back.
Features
Typical Applications
If reverse rotation occurs serious safety problems would be created and possible machinery failure.
To overcome the problem of drive reversal a Renold Sprag Clutch holdback is fitted to the conveyor headshaft and held with a torque arm against stops fitted to the framework of the conveyor.
Aggregates Industry
Renold SH Sprag Clutch Holdbacks are used in the aggregates industries Worldwide, often in conjunction with high quality RENOLD GEARBOXES, typically on inclined conveyors.
The SH Sprag Clutch Holdback is positioned on the end of the conveyor headshaft. If the drive fails or is stopped when the conveyor is loaded the SH Sprag Clutch Holdback instantaneously prevents any runback. This is due to the sprag elements of the clutch being in constant contact at all times with the inner and outer races of the clutch element of the holdback. Resultant downtime is prevented and also any potential accident risk to personnel.
Renold SH Sprag Clutch Holdbacks are ideal for use in the aggregates industry being equipped with high quality seals that prevent contaminants from reaching internal parts and ensuring long unit lifetime.
Mining
Renold SH Sprag Clutch Holdbacks are fitted to inclined conveyors used to transport bulk materials in many coal or iron ore mines around the World. A typical example of a mine application is shown on the right. Fitted to an apron feeder drive in an iron ore mining plant in Canada the SH Sprag Clutch Holdback with Central Torque Arm prevents any runback in the drive, if the drive fails or is stopped. This is due to the sprag elements of the clutch being in constant contact at all times with the inner and outer races of the clutch element of the holdback. Resultant downtime is prevented and also any potential accident risk to personnel.
The high quality components and overall robustness of the Renold SH Sprag Clutch Holdback with Central Torque Arm design is ideally suited to the heavy duty and hostile environment that apron feeders operate in ensuring long unit lifetimes.
Material Handling
Renold SH Sprag Clutch Holdbacks are fitted to many inclined conveyors and bucket elevators that transport bulk handling materials around steel works, such as coking coal and iron ore, major docks, moving bulk materials to storage and many other sites around the World.
Whenever a Renold SH Series Sprag Clutch Holdback is fitted it provides the user with complete peace of mind knowing that not only have they purchased a holdback that provides instant runback protection every time when needed, but is also of the highest quality and the knowledge that a superb back up service is available to enhance their investment even further.
The Renold REGV Series Trapped Roller Freewheels are self-centering by means of plain bearings.
Torque is transmitted to the inner race via a key and the outer race via the torque arm. Shaft tolerance must be h6.
The primary use for the REGV freewheels is as a backstop. The freewheel should be fixed to the machine body by placing brackets on either side of the torque arm or by using a pin or bolt in the slot. Note that a clearance of 1% of slot width is needed between torque arm and brackets or slot and pin. If a bolt is used instead of a pin it must not apply any axial loads to the torque arm.
Backstopping
An alternative application would be indexing where a push rod is connected to the torque arm slot. Clearance between slot and pin must be 1% of slot width.
The REGV is supplied pre filled with grease and normally requires no further sealing.
Indexing
The REUK Series is a Freewheel incorporating a 62 Series bearing.
The self-centering freewheels are already grease-lubricated and come with dust-proof protection.
For the REUK model, the transmission occurs by mounting the inner race onto a shaft with an n6 tolerance. The outer race is fitted into a housing with an N6 tolerance.
The REUKC model is equipped with a keyway on the inner race and should be fitted on k6 tolerance shafts. The outer race is fitted into a housing with an N6 tolerance.
The REUKCC model is equipped with a keyway on the inner and outer race. The inner race is fitted onto a shaft with an n6 tolerance. The outer race is fitted into a housing with an H6 tolerance.
The REUK2RS model is equipped with waterproof seals.
The REUK Series is built with a C5 clearance that turns into a normal clearance after keying.
The races can be glued to the shaft and the seat. In this case, the clearance remains C5.
Renold REUS Series Trapped Roller Freewheels are non self-centering. Bearings must be placed adjacent to the freewheel to ensure concentricity between inner and outer races.
The REUS Series freewheels have the same outside dimensions as standard 62 series bearings.
Torque is transmitted to the inner race via a key and the outer race by means of an interference fit. If the face keys in the outer race are used for torque transmission the housing tolerance should be H7 to provide a press fit. The housing must be strong enough to accept the stresses from the interference. Shaft tolerances must be h6/j6.
Prior to use, the freewheel must be lubricated. Oil lubrication is essential for over running applications.
The REUS is an open design so sealing must be provided by the installation.
The REGL F2-D2 (or D3) series comprises an REGL Base Unit freewheel, combined with an F2 Fixing Flange and a D2 (or D3) Cover Flange.
Torque is transmitted to the inner race via a key from the shaft and the outer race by means of bolts.
Components mounted onto the outside diameter of the outer race should be bored to an H7 tolerance. Shaft tolerance must be h6/j6.
The unit is supplied with two paper gaskets for use between outer race and sealing cover/fixing plates. Failure to use the gaskets may cause loss of lubricant and subsequent rapid failure of the freewheel.
Prior to use, the freewheel must be lubricated as per instructions on page 35 of our current catalogue.
The REGL F2-D2 (or D3) unit is a self sealed design. If a D3 type End cap is used, a sealant must be applied to the keyway to avoid loss of oil lubricant through the keyway.
For pre-greased lubrication options the REGLG range is available, contact Renold Sales for assistance.
