overload protection devices development of manufacturing methods and production techniques has led to machinery and equipment being more automated and systematically combined to provide the best material flow and production efficiency in these conditions any small accident which could damage either machinery or drive lines can result in extended downtime of the total plant cross morse range of overload protection devices are designed to prevent damage of machinery or drive line in the event of an overload so avoiding the need of costly repairs and minimising production downtime several methods of overload protection are available these being as classified below all of which provide various levels of protection cross morse units are all of mechanical operation for minimum maintenance and simplicity of operation te l 4 4 1 2 1 3 6 0 0 1 5 5 classification of overload protection types friction type constant drive constant torque very low cost robust design very high torques low cost r
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torque limiters selection selection procedure 1 determine if the torque limiter is to be mounted on input driver or output driven shaft mounting on input shaft is normally lowest cost and spreads load on limiter body in overload slip but if frequent slip occurs longer wear life of friction facings is obtained with the torque limiter on the output shaft and shaft speed using formulae:torque nm h.p x 7124 r.p .m 4 refer to pages 4 and 5 select size of torque limiter where 5 using capacity below confirm selection of torque limiter rated torque slightly exceeds slip torque confirm selected torque limiter will accept drive shaft diameter te l 4 4 1 2 1 3 6 0 0 1 5 5 2 determine normal drive torque from input power torque nm kw x 9550 r.p .m for machines under constant supervision or with motor overload sensors the 10 sec values should be used for unmanned machines combination of torque and speed should always be within power ratings over 5 min to avoid deterioration of components parts
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sheargard overload clutches the cross sheargard clutch complements the range of torque limiters by providing machinery protection on applications where accurate torque control and shaft synchronisation are necessary and when in the event of an overload total disengagement of driving and driven members is required the design of the sheargard clutches provides for the transmission of high torques up to 125,000 nm with a compact low inertia unit standard stock products enables prompt delivery at low cost of shearpin chain sprockets and flexible shaft couplings the provision of an optional motor monitor plate enables disconnection of the power supply and or operation of alarm signals in the event of an overload when used in conjunction with a limit switch or proximity switch the basic advantages of the well proven howdon wedge shearpin have been combined with a clutch designed for economic production with component parts sized to enable the use of the existing range of torque limiter pl
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crossgard overload couplings the crossgard series of overload protection clutches all use sprung loaded balls locked in detents to provide drive and overload control the balls are random positioned in the clutch so drive can only be engaged in one relative angular position between driver and driven shafts so ensuring full synchronisation of the drive at all times in the event of an overload the balls are driven out of their detents to release the torque and cause axial movement of the pressure plate which can be used to actuate a limit switch or proximity sensor to isolate the drive all units are fitted with a torque indicator to enable simple setting of the desired torque rating there are three basic types of crossgard clutches all of which are available as flexible shaft couplings types cg cgx and cgz te l 4 4 1 2 1 3 6 0 0 1 5 5 crossgard principles of operation during normal operation torque is transmitted between hub and driving flange by a number of balls located in the flange
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type cg crossgard flexible couplings two basic types of couplings are being offered type es rubber elastic coupling and type cc roller chain coupling both combine the full overload protection capabilities of the cg crossgard with facility of shaft to shaft connection te l 4 4 1 2 1 3 6 0 0 1 5 5 crossgard cg-cc couplings a standard roller chain sprocket is connected by a duplex roller chain to a platewheel mounted on the cg clutch this construction provides a simple reliable low cost means of transmitting drive with minimum backlash and accommodating reasonable shaft misalignment both taper-bored and pilot bore sprockets are available fax +44 121 325 1079 cg-cc crossgard chain coupling torque nm model min cg20-cc cg30l-cc cg30h-cc cg50l-cc cg50m-cc cg50h-cc cg70-cc cg90l-cc cg90h-cc cg110l-cc cg110h-cc cg130l-cc cg130h-cc 10 20 54 69 137 196 294 441 931 686 1568 1176 2646 max 44 54 167 147 412 539 1080 1323 3136 1960 5096 3038 7154 max speed rpm 700 500 300 160 120 100 80 misalignmen
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type cgz crossgard clutch provides total disengagement in event of overload suitable for mounting gears cams sprockets and timing belt pulleys te l 4 4 1 2 1 3 6 0 0 1 5 5 x 2-Øv depth w travel when tripping min torque position rotated revolution scale degree scale fax +44 121 325 1079 1 2 3 4 hub centre flange driven flange plate plate 5 6 7 8 ball cage adjustable nut bearing z type steel ball 9 10 11 12 coil spring snap ring snap ring set screw 13 14 15 16 lock plug hex-head bolt spring washer set screw torque scale for selection of crossgard cgz clutches refer to page 14 setting torque range nm 2.4 4.1 8.2 6 20 39 26 44 88 63 128 245 8.3 15.7 31.4 20 52 93 1800 1800 1800 max running speed rpm colour of spring x number yellow x 3 blue x 3 blue x 6 yellow x 4 red x 4 red x 8 blue x 5 red x 5 red x 10 red x 5 1800 red x 10 green x 10 22 50 13.7 21.2 17 40 8.71 9.60 12 30 4.17 2.78 8 20 2.57 1.09 pilot bore mm max bore mm model cgz20 l cgz20 m cgz20 h cgz30 l cgz30 m cgz30 h cgz40 l c
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cross safegard cs clutch types safegard csf synchron csy te l 4 4 1 2 1 3 6 0 0 1 5 5 during normal operation the drive is transmitted by the sliding hub 2 which is connected by a spline to the main hub 1 and via a ring of balls 4a to the output flange 3 drive is maintained by the springs 6 exerting pressure on flange 2 so keeping the balls in their respective indents in flange 2 3 when an overload occurs the balls ride up the indents pushing flange 2 back which will actuate limit switch 9 during overload conditions plain bearing 5 maintains concentricity and ensures free running the balls will re-engage in the nearest indents when the overload is removed torque adjustment is by rotation of nut 7 the synchron clutch functions in much the same way as the safegard and has similar construction in except the balls 4a are replaced by seven rollers 4b the rollers are unequally spaced so the clutch will only engage drive in one angular position providing full synchronisation of the drive w
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cs mini series couplings cs mini series couplings for shaft to shaft connection cs mini series clutches are available with an elastomeric coupling for all the sizes and modes of operation simple overload synchronous overload the elastomeric coupling permits up to 1/2 degree of angular misalignment with 0.3mm radial and a maximum of 0.5mm axial the rubber element absorbs peak shocks providing greater accuracy in overload protection up to four torque ranges are available on each size of clutch controlled by selection of the actuating spring set providing a wide range of torque capacities to select from the series is suitable for moderate speed applications with low radial forces and infrequent tripping the design is suited to inline stop switch or proximity switch see page 26 te l 4 4 1 2 1 3 6 0 0 1 5 5 e-cc fax +44 121 325 1079 cs mini series couplings technical capacities models torque range according to spring selection s nm 2.5-5.0 5-10 6-12 12-25 12-25 25-50 25-50 50-10 m nm 5-1
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series cz safegard overload clutches standard plain bore units type h standard zero backlash clutches types h&k these clutches are intended for keyway connection to shafts where pre-machined synchronisation is the preferred design type h is used to mount compact drive systems with minimal overhung load the single deep groove ball bearing providing full radial support for the sprocket pulley or gear type k has an extended inner race to support a second bearing to allow fitment of wider transmission elements and where high radial loads may be encountered type k te l 4 4 1 2 1 3 6 0 0 1 5 5 fax +44 121 325 1079 cz series types h k technical capacities models h&k clutch size 25 30 40 50 60 torque range according to spring selection s nm 3-14 9-35 19-65 35-110 80-185 m nm 6-28 18-70 38-130 80 -2 2 0 160-370 u nm 13-56 40-140 78-260 160-440 320-740 max.speed rpm 4000 3000 2500 2000 1200 bore size m min mm 8 10 14 18 24 max mm 20 30 35 45 50 weight kg type h 0.74 1.37 2.28 3.29 5.12 typ
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type h standard zero backlash clutches types h&k these clutches are intended for keyway connection to shafts where pre-machined synchronisation is the preferred design type h is used to mount compact drive systems with minimal overhung load the single deep groove ball bearing providing full radial support for the sprocket pulley or gear type k has an extended inner race to support a second bearing to allow fitment of wider transmission elements and where high radial loads may be encountered type k h2 h1 ø p9 series cn safegard overload clutches standard plain bore units sizes 25 ÷ 50 te l 4 4 1 2 1 3 6 0 0 1 5 5 fax +44 121 325 1079 cn series types h k technical capacities models h&k clutch size 11 16 20 25 30 40 50 torque range according to spring selection s nm 0.65 3.0 2-5 4 10 4 14 9 35 19 65 35 110 m nm 1.3 6 4 10 8 20 8 28 18 70 38 130 80 220 l nm 2-9 6 15 12 30 12 42 27 105 57 195 120 330 u nm 2.6 12 8 20 16 40 16 56 40 140 78 260 160 440 max speed
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shady lane great barr birmingham england b44 9eu telephone +440121 360 0155 sales direct +440121 325 2500 facsimile +440121 325 1079 email sales@crossmorse.com website www.crossmorse.com power transmission products roller chain drives timing belt drives silent chain drives clamping elements overload clutches torque limiters mounted bearings stieber freewheels shaft couplings sprag clutches tensioners sprockets pulleys gears your local stockist opc2009 opc2009©t.d.cross ltd 01/09 index back next
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