Torsional LM Series Overview

Transcription

1 orsional LM Series Overview LM Series he LM Series torsional couplings are designed specifically for diesel engine driven equipment. he LM couplings are highly torsionally compliant, allowing the engine to drive a relatively small inertia load safely from damaging torsional resonance over a wide speed range from low idle PM to full engine speed. his task is accomplished by shifting the critical speeds far enough below the idle speed allowing full use of the entire working speed range of the engine with very few limitations. hese engineered couplings affect an attenuated level of stress throughout the whole drive train by reducing vibratory torque to a very low level. he coupling selection should be verified with a orsional Vibration Analysis of the system. Materials Elastomeric Element emperature-resistant natural rubber available in a variety of Shore A scale hardness to suite individual application requirements -49 to 2 F operating temperature range Silicone element available for high ambient temperatures EPM available for chemical resistant -49 to 25 F operating temperature range Outer ing High-grade cast aluminum alloy Inner Hub Steel with minimum tensile strength of 85, psi (6 N/mm²) Available in bore with keyway and spline connections aper-loc spline hubs available Splines with L-LOC available ypical Applications Splitter-gear multiple pump drives enerator sets (2-bearing) Locomotives Hydraulic pumps Centrifugal pumps Compressors ange of Sizes 8 sizes ranging from nominal torques of 2,2 to 33,6 in-lb (25 to 38 Nm) SAE J62 Flywheel sizes available from 6 through 8 3 coupling design types

2 LM orsional Coupling esign ypes ype SB Sizes 24 to 24 he driven inner hub consists of two pieces: the vulcanized steel ring and the inner tapered hub. hese two parts are bolted together and the torque is transmitted by the friction force created by the axial bolts, drawing the tapered hub into the mating taper in the element. orsional LM Series ypes SB, SC, SBE and SCE Selection ata his is a long tapered fit, but can easily disassembled if the coupling has to be removed. he vulcanized steel ring creates a very high inward pressure acting on the inner driven tapered hub. o utilize this pressure, the driven hub is slotted in an axial direction. his compresses the driven hub and driven shaft. his clamping effect can be used equally well on cylindrical shafts with keys or splined shafts. ype SB apered Locking Hubs ype SC Sizes 28 to 35 An inner ring made of spheroidal cast iron is vulcanized into the elastomeric element. his flange is bolted to the inner tapered hub. epending upon the arrangement of the elastomeric element, two different lengths are possible utilizing the same components. Standard Configuration: eversed Element: (extended mounting length) SCA SCB ype SCA ype SCB ypes SBE and SCE Special adial Assembly / isassembly ypes (rop-out ypes) All Sizes he elastomeric element can be changed quickly and easily without disturbing the coupling shaft, provided the flywheel housing does not protrude too much. hese versions can be particularly advantageous on larger sizes, especially if the hub is interference fit. ype SBE ype SCE Special ypes In addition to the standard types shown here, many special types have been developed. Please contact Lovejoy echnical Support for more information

3 JW LM Series - SB, SC9A and SCB (H) Per9formance ata Notes: n * indicates: At Hz. n ** indicates: Constant value for natural rubber. n *** indicates: Flywheel side of the coupling. esonance Factor V elative amping Fa9ctor y High emperature ubber (H) f in Hz V r y Silicone emperatunre Factor S t S t orsional LM Series ypes SB, SCA and SCB (H) Performance ata Hardness Nominal Max Continuous* Allowable ynamic** Flange Max Mass Moment of Inertia (urometer) orque ating orque ating Vibratory Power orsional Size for Speed Primary*** Secondary KN Kmax orque Loss Stiffness J62 N max J J 2 Shore A KW P KV C dyn Flywheel Size scale in-lb Nm in-lb Nm in-lb Nm Watts in-lb/rad Nm/rad PM lb-in 2 kg-m 2 lb-in 2 kg-m 2 LM24 LM4 LM8 LM2 LM6 LM24 LM28 LM35 JW Frequency Factor S f f in H z 5 2,2 25 4, ,66 3 5,3 6, ,4 4 3, KN LN S t egrees F 8, , , 35 6,64 75,24 4 9, ,54 4 7,8 8,42 6 4, ,43 5 8,85, , , ,74, , ,2 7 2,4 4 2,48 28 emperature Factor S t2 for Cont. Vibr. orque kw and Allowable Power Loss P kv H S t2 3, , , , , 7 3, , , ,4 95 7,7 2 3, , , ,85 7,7 2 3, , , ,6 2 2, , , , ,5 3 26,6 3 4,6 52 4, 7 5 2, , , ,9 8 3, , ,6 9 53, 6.5 3, , , ,7 2 35,4 4 7,8 8 33, 5 8 2, ,7 2 35,4 4 7,8 8 88,5 4 3, , ,3 5 8, , 5 6 2, , , 6 9,9 2 22, , , , 6 9,9 2 22, , ,6 3 66,4 7 5, , , , ,8 8, , , , ,5 6 5, , 6 4 3, , 3 5 7,8 8 2, , , Sf f / 7 33, , , , , P kv P v < P kv * S t2 w < kw * S t2 * (/S f ) egrees F kw

4 orsional LM Series ypes SB, SCA and SCB (H) imensional ata Note: LM Series - SB, SC9A and SCB (H) im9ensional ata A C** I d3 B E L L N SAE Min Bore Max Bore Weight J62 Size in mm in mm in mm in mm in mm in mm in mm in mm in mm in mm lb kg 24 SB ± ± ± ± SB ± ± ±.8 82 ± SB ±.2 7 ± ± ± SB ±.6 65 ± ± ± ± ± SB ± ± ± ± ± ± SB ± ± ± ± ±.6 93 ± SCA ±.6 93 ± ±.6 93 ± ±.6 35 ± SCB ±.6 35 ± ±.6 35 ± ±.3 ± SCA ±.3 ± ±.3 ± ±.3 35 ± SCB ±.3 35 ± ±.3 35 ± Note: apered Bolted SB SCA SCB n * indicates: SAE J62 Flywheel imensional ata can be found on page -4. n ** indicates: At Hz. JW JW

5 JW LM Series - SBE an9d SCE (H) Perfor9mance ata Notes: n * indicates: At Hz. n ** indicates: Constant value for natural rubber. n *** indicates: Flywheel side of the coupling. orsional LM Series ypes SBE and SCE (H) Performance ata Hardness Nominal Max Continuous* Allowable ynamic** Flange Max Mass Moment of Inertia (urometer) orque ating orque ating Vibratory Power orsional Size for Speed Primary*** Secondary KN Kmax orque Loss Stiffness J62 N max J J 2 Shore A KW P KV C dyn Flywheel Size scale in-lb Nm in-lb Nm in-lb Nm Watts in-lb/rad Nm/rad PM lb-in 2 kg-m 2 lb-in 2 kg-m 2 LM24 LM4 LM8 LM2 LM6 LM24 LM28 LM35 JW 5 2,2 25 4, , , ,66 3 5,3 6, ,4 4 3, , 35 6,64 75,24 4 9, ,54 4 7,8 8,42 6 4, ,43 5 8,85, , , ,74, , ,2 7 2,4 4 2, , , , , , 7 3, , , ,4 95 7,7 2 3, , , ,85 7,7 2 3, , , ,6 2 2, , , , ,5 3 26,6 3 4,6 52 4, 7 5 2, , , ,9 8 3, , ,6 9 53, 6.5 3, , , ,7 2 35,4 4 7,8 8 33, 5 8 2, ,7 2 35,4 4 7,8 8 88,5 4 3, , ,3 5 8, , 5 6 2, , , 6 9,9 2 22, , , , 6 9,9 2 22, , ,6 3 66,4 7 5, , , , ,8 8, , , , ,5 6 5, , 6 4 3, , 3 5 7,8 8 2, , , , , , , , esonance Factor V elative amping Fa9ctor y High emperature ubber (H) f in Hz V r y Frequency Factor S f f in H z Sf f / Silicone emperatunre Factor S t S t KN LN S t egrees F emperature Factor S t2 for Cont. Vibr. orque kw and Allowable Power Loss P kv H S t2 P kv P v < P kv * S t2 w < kw * S t2 * (/S f ) egrees F kw

6 orsional LM Series ypes SBE and SCE (H) imensional ata Note: SBE SCE n * indicates: SAE J62 Flywheel imensional ata can be found on page -4. LM Series - SBE an9d SCE (H) adial9 imensional ata A C** I d3 E L L N SAE Min Bore Max Bore Weight Size J62 in mm in mm in mm in mm in mm in mm in mm in mm in mm lb kg 24 SBE ±.8 3 ± ±.8 3 ± SBE ±.8 7 ± SBE ±.8 7 ± ±.8 9 ± SBE ±.8 3 ± ±.8 2 ± ±.8 68 ± SBE ±.8 68 ± ±.8 68 ± ±.8 63 ± SBE ±.8 63 ± ±.8 63 ± ±.8 64 ± SCE ±.8 64 ± ±.8 64 ± ±.8 85 ± SCE ±.8 85 ± ±.8 85 ± Note: n ** indicates: he rubber element can be positioned closer to or farther from the flywheel within the limits shown for this dimension, while maintaining full engagement with the outer drive ring. Hub length L is adjustable as well with corresponding changes to mounting length dimension C. LM Series - Silico9ne (5 shore A) Performance at9a emperature Factor St2SI for Cont. Vibr. orque kw and Allowable Power Loss P kv egrees F Nominal *Max **Max Continuous Allowable ynamic orsional Stiffness*** elative orque orque orque2 Vibratory Power C dyn amping ating Kmax Kmax2 orque Loss % KN 25% KN 5% KN 75% KN % KN Ψ KN KW P KV Size in-lb Nm in-lb Nm in-lb Nm in-lb Nm Watts in-lb/rad Nm/rad in-lb/rad Nm/rad in-lb/rad Nm/rad in-lb/rad Nm/rad in-lb/rad Nm/rad LM8 6,2 7 9,29 5 2,4 4 2, , , , , 3 5 4,7 4 6 LM2 8,85 3,3 5 7,7 2 3, , , , , ,5 7 4 LM6 2,8 45 9, , , , , , 6 66, ,6 9 9 LM24 7,7 2 26,6 3 35,4 4 7, ,8 8 77, ,5, , 6 5 LM28 24, , , , , 2 2, , , , 42 5 LM35 28, , ,6 6 4, , , , 6 77, 2 235, 26 5 Notes: n * indicates: max is the maximum accelerating value for transient torque spikes during the normal work cycle, for example, form accelerating through a resonance during starting and stopping or clutching. n ** indicates: max2 represents the absolute maximum peak torque allowable during rare occasions such as during a short circuit of a gen-set or incorrect synchronization. n *** indicates: he silicone material creates a progressive stiffness characteristic dependent on load. hese values have the tolerance of ± 5%. SILICONE St2SI Pkv JW P v < P kv * St2SI w < k w * St2SI * (/Sf) kw.5 JW