Voith Turbo. Voith Spider Torque Coupling

Transcription

1 Voith Turbo Voith Spider Coupling

2 Flexible and failsafe spider coupling Modular design can change spider in situ when w hub is used by remaining D plate only. C Spider buffer J Jaw hub V Inverted hub M i flange O Retainer plate C Spider buffer W Reverse hub B Brake drum H Hold hub Overview of ST Coupling components. Product description The Voith Spider (ST) coupling transfers torque and accepts misalignment between connected drive shafts. The coupling uses a flexible spider, which compensates for axial, radial, angular offsets as well as torsional movement. A spidertype design is used for the buffer element of the Voith ST coupling. It consists of solid elastomeric cylinders joined by an internal ring. The cylinders are compressed between the jaws of the ST coupling. Depending on the direction of the drive, only half the cylinders in the coupling are compressed. Drive Load The compression principle suits the elastomeric materials and long service life is achieved. The better the alignment of the coupling, the less the abrasive stresses. The largevolume buffers permit demanding conditions to be integrated. The softer compounds absorb more vibration, with lower torque transmission capacity. The harder compounds increase the torque capacity without increasing the coupling size, with lower vibration absorption. Key benefits Torsional flexibility. Alignment compensation. Vibration absorption. Failsafe arrangement. Modular assembly. Different materials to suit needs. Long service life. Axial blind assembly. Application versatility. Typical applications Cranes. Winches. Escalator. Centrifugal pumps. Fans and compressors. Hammer mills. Bucket elevators. Scraper conveyors. Power generators. Rotary mills. Turbine mills. Fluid couplings. Crushers. Reciprocating pumps. Axial float applications. Steel mill roller tables. Heavy reverse drives. Limited float available. Illustration of Spider cylinder compression. 1

3 Coupling selection procedure Step 1: Calculate nominal torque Tn using absorbed power Pa(kW) [when not available use motor power.] The installed motor power (kw) is preferred in cases where the coupling must hold the stall torque. Tr = Tn x SF Note: Tr must be smaller than Tp[Peak torque of coupling]. Step 3: Using this answer, check coupling torque (Tp) in Table 1 and select the correct buffer material from Table 3. Alignment tolerance [See table 1 below] r Radial Angular Gap a g Tn = Pa(kW) x 9 0 Shaft speed (rpm) Step : Multiply the answer by the service factor (SF) from Table. Step : Check the maximum speed (rpm), inertia, mass, bore sizes and keys. Note: Dimension g is Cg in the coupling dimensions table on page 3. The value given below is the tolerance applicable to the gap. Table 1 Speed, torque ratings and alignment values Coupling Type & Size # ST ST 70 ST ST ST 1 ST 15 ST 170 ST ST ST ST 0 ST ST Speed Rpm Nom Perbunan Nom Red Nom Blue r Radial (mm) Alignment tolerance a Angular (mm) g Gap (mm) ±0.6 ±0.8 ±1.0 ±1.3 ±1.5 ±1.5 ±1.8 ±.0 Table Service factors Duty Class Light Duty Medium Duty Heavy Duty Extra Heavy Duty Ultra Heavy Duty Driven Machine example types Centrifugal Pumps, Fans & Belt conveyors. Hammer mills, Bucket elevator, scraper conveyor. Crushers, cranes, hoists, calendars, grissleys. Reciprocating pumps, compressors 3 cyl or less Steel mill roller tables, heavy reversing drives Electric Motors + Turbines 1 Cyl. +3 Cyl >5.0 Driver prime mover Internal combustion engines Cyl. + more Table 3 Spider torque coupling material Material Used Natural Rubber Perbunan Green Red Blue Shore hardness Colour Part code Permissible temperature Continuous range Intermittent range Fatigue capacity Abrasion resistance Torsional rigidity Product availability Resistance to: Petrol Benzole Oil & grease Acids Alkalines Hot water Normal weather Tropical climates 70a75a ST (size) C70nr o to o C o to o C Soft On request a a ST (size) Cnt o to o C o to o C Medium Exstock Very a a Green ST (size) Cvg 35 o to o C 0 o to o C Medium On request Very Satisfactory 93a a Red ST (size) C93vr 35 o to o C 0 o to o C High Exstock Very Satisfactory d 6d Blue ST (size) Cvb 35 o to o C 0 o to o C Very High On request Very Satisfactory

4 Voith Spider Coupling [flexible and failsafe] Bc Bh Bg Jc (S) Je Cg Jh At MinøJb Jh øjb øjd øwd øwb Wh Hh øhb øhd q x øha on øhe øbd J C Cs J W O C B H Assembly JCJ Standard Assembly WBH Accessible spider and brake drum Coupling Dimensions Hubs and brakedrums supplied in steel or SG iron. Buffers supplied in material selected from table 3 on page. Coupling size ST ST 70 ST ST ST 1 ST 15 ST 170 ST ST ST ST 0 ST ST øjb max Jc Cg Je øjd/hd øwd øwb max Jh/Hh Wh Bh *øbd øho Cs M M M M M M M M M M 6 9 Technical details: JCJ Coupling size ST ST 70 ST ST ST 1 ST 15 ST 170 ST ST ST ST 0 ST ST Mass (kg) Inertia (kgm ) Technical details: WBH Coupling size ST ST 70 ST ST ST 1 ST 15 ST 170 ST ST ST ST 0 ST ST At Mass (kg) Inertia (kgm ) *Drum diameter can vary to your requirements. Certified drawing on request. Material codes: sm=steel, dc=sg iron, al=aluminium, gc= cast iron When ordering please specify Named by: Brand Type Size Assembly Voith ST JCJ b b1 70a st Standard coupling Description Component material (st=steel) (al=aluminium) Buffer material (nt shore Perbunan) Driver/Driven shaft size 3

5 Voith Spider Coupling [flexible and failsafe] Jc Xc (SX) qxømo qxømo Vc (SV) qxømo Mc (SZ) øjd max.øjb Jh max.øvb Vh ømu ømp ømm J C M Mf V C M Mf M C M Mf Assembly JCM External hub flange Assembly VCM Inverted hub flange Assembly MCM Flange to flange Coupling Dimensions Hubs supplied in steel or SG iron. Flanges supplied in aluminium or steel. Buffers in material selected from table 3 on page. Coupling size ST ST 1 ST 15 ST 170 ST ST ST ST 0 ST ST ST ST Voith ENK size Xc Vc Mc axial øjd Jh Je max. øjb øvd Vh max. øvb ømm ømp ømu Mf q x ømo Demount holes ± x9.5 xm ± x9.5 xm ±1.5 ±1.8 ± x9.5 6x1 8x1 xm8 xm1 xm ± x1 xm x1 xm x1 xm x18 xm x18 xm x xm x xm0 Technical details Coupling size ST ST 1 ST 15 ST 170 ST ST ST ST 0 ST ST ST ST JCM Mass (kg) JCM Inertia (kgm ) VCM Mass (kg) VCM Inertia (kgm ) MCM Mass (kg) MCM Inertia (kgm )

6 Voith Turbo (Pty) Ltd P O Box 13171, Witfield, 167, Gauteng, South Africa Tel: Fax: info@voith.co.za Voith South Africa / (Spider Coupling PDF. 00/5) Subject to change without notice as result of further technical development.