Eaton Airflex CB Series Installation, Operation And Maintenance Manual

1.0 INTRODUCTIONThroughout this manual there are a numberof HAZARD WARNINGS that must be readand adhered to in order to prevent possiblepersonal injury and/or damage to equipment.Three signal words “DANGER” , “WARNING ” ,and “CAUTION” are used to indicate the se-verity of a hazard, and are preceded by thesafety alert symbolDANGER - Denotes the most serioushazard, and is used when serious injury ordeath WILL result from misuse or failure tofollow specific instructions.WARNING - Used when serious injuryor death MAY result from misuse or failure tofollow specific instructions.CAUTION - Used when injury orproduct/equipment damage may result frommisuse or failure to follow specific instructions.It is the responsibility and duty of all personnelinvolved in the installation, operation and main-tenance of the equipment on which this deviceis used to fully understand the DANGER,WARNING, and CAUTION proce-dures by which hazards are to be avoided.1.1 Description1.1.2 The Airflex® air-actuated CB element assem-bly is designed and manufactured to providedependable clutch or brake service in a multi-tude of industrial applications. It is suited tohigh speed, cyclic operations, as well as forcoupling and general power transmission. Alltorque load is carried through the neopreneand cord actuating tube which absorbs damag-ing shock loads. The Airflex CB element as-sembly requires no lubrication or adjustment.1.1.3 Airflex element assemblies are available fordrum diameters from four inches through 45inches. The element size designation indi-cates the nominal outside drum diameter ininches, the clutch model, and the width of thefriction material. For example, size “12CB350"indicates the element operates on a drum hav-ing a nominal diameter of 12 inches, is an Air-flex ”CB" series clutch or brake (the scope ofthis manual) and has friction material which isthree and one-half inches wide.1.1.4 Where diametral space is limited, or thetorque required is greater than a single ele-ment can transmit, CB elements size12CB350 and larger can be supplied as dualunits.1.2 How It Works1.2.1 Referring to Figure 1, CB construction con-sists of a neoprene and cord actuating tubewhich is bonded to the outer steel rim. The rimis drilled for mounting to the driving compo-nent (or reaction bracket in the case of a CBbrake application). Friction shoe assemblies(FSA’s) are attached to the inside diameter ofthe tube with shoe pins which are then re-tained with lockwires.1.2.2 As air pressure is applied to the air actuatingtube, the tube inflates, forcing the friction shoeassemblies uniformly against the drum whichis attached to the driven component. In thecase where the CB element is being used as aclutch and is attached to the driving shaft,through the element mounting component(typically an iron spider), through the rim/tubestructure to the friction shoe assemblies,where the torque is trnasmitted through thefriction couple to the components mounted onthe driven shaft (clutch drum and drum mount-ing component). As actuating air is exhausted,the resiliency of the tube, aided by centrifugalforce when used as a clutch, retracts theshoes, resulting in total disengagement.1.3 Element Adjustment1.3.1 Airflex CB elements are completely self adjust-ing and automatically compensate for liningand drum wear. Lubrication is not required.The torque developed is dependent upon rotat-ing speed and applied air pressure. By limitingthe applied pressure, the element will act as atorque limiting device and provide overloadprotection.1.3.2 To accomplish regulated or cushioned engage-ment of the element, a flow control valve maybe installed in the element air supply line andadjusted to restrict air flow to the elementwhile allowing free flow away from the elementfor rapid disengagement. By adjusting theflow, the rate of engagement may be varied.Note that the flow control valve does not regu-late air pressure - the supply pressure must al-ways be adequate to transmit the maximumrequired torque. Refer to the OPERATION sec-tion of this manual for air piping configurations.PDF Format 2 © Copyright Eaton Corp., 2001. All rights reserved.StockCheck.comDownloaded from StockCheck.com