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20 P&TR Nov/Dec 2011 R M FOWLER LIMITED AUTHORISED LINEAR DISTRIBUTORS The complete www.rmfowler.co.uk linear range from our stock. LH SERIES SIZE 15 – 65 LS SERIES SIZE 15 – 35 LW WIDE SERIES SIZE 17 – 50 RA HIGH CAPACITY ROLLER GUIDES PU & PE MINIATURE STAINLESS SERIES SIZE 7 – 15 Rails cut to length and assembled same day HIGH PRECISION & MACHINE TOOL TYPES IDENTIFIED K1 SEALS & PROTECTOR PLATES ROLLED BALLSCREWS AND NUTS VSP PRECISION ROLLED BALLSCREWS PRECISION GROUND BALLSCREWS Shaft ends ground and machined promptly WBK, BK, FK BALLSCREW SUPPORT BEARINGS Interchange with many leading manufacturers Quick size references on our website 8 THE GROVE, PARKGATE INDUSTRIAL ESTATE, KNUTSFORD, CHESHIRE WA16 8XP Tel:01565 651051 Fax:01565 754204 E-mail: sales@rmfowler.co.uk The overrunning alternator pulley – an unsung hero of the internal combustion engine In modern internal combustion engines, the overrunning alternator pulley (OAP) is an important component that often gets unfairly overlooked, particularly when you consider the positive effects it has on improving the energy efficiency of an engine. The OAP is the functional interior of the belt pulley mounted on the alternator. The function of the OAP is to decouple the alternator from the rotational irregularities of an internal combustion engine. The task the OAP performs is therefore a critical one, particularly as the rotational irregularities that occur in the latest internal combustion engines – including turbocharged versions – are significantly higher than those indicated to the vehicle’s driver by the tachometer needle. In a vehicle’s accessory drive, the alternator is the component with the greatest mass moment of inertia and the highest speed. This means that the acceleration and deceleration forces acting on the alternator resulting from the rotational irregularities have the greatest effect on the belt transferring these forces. The OAP therefore ensures that, at many operating points, only the accelerating proportion of the crankshaft forces that are transferred to the belt drive are used to drive the alternator. The advantages of the OAP with a oneway clutch are clear. The reduction in the force level in the belt drive extends the life (typically by a factor of 10) of individual components, while ensuring an increase in the generator speed and a reduction in noise. In addition to smoother engine running, the OAP also contributes towards the reduction of fuel consumption and therefore CO2 emissions. For example, in Schaeffler’s CO2ncept-10% concept vehicle, the OAP contributed a reduction of almost one per cent in fuel consumption. In urban traffic conditions – where a large proportion of time is spent idling and accelerating – the belt drive with the OAP is subjected to significantly lower loads than a belt drive without an overrunning pulley. Use of the OAP also enables the more cost effective design of other components in the overall belt drive system. Volker Ploetz, Senior Manager Transmission Components at Schaeffler Group Automotive comments: “The overrunning alternator pulley works in a similar way to the freewheeling of a bicycle pedal, whereby only the acceleration proportion of the crankshaft’s rotational irregularities is used to drive the alternator. The advantages from this include more effective damping of belt oscillations, which means you no longer need idler pulleys or damping pulleys. You also get a reduction of tensioning forces and lengths, as well as improved noise behaviour, reduced belt width and increased system life. The use of alternators with high mass inertia is also possible. In terms of assembly, the overrunning alternator pulley is easy to fit, as no separate fasteners are required.” This important contribution towards improving energy efficiency also explains why the OAP has been so successful in both diesel and petrol engines. The component – which has been established for around 15 years now – was regarded early on as a key component for eliminating the rotational irregularities from the belt drive of the new generation of high torque, direct-injection diesel engines. The OAP is now also included in the extensive list of measures for optimising the fuel consumption of internal combustion engines. A comprehensive modular OAP system has been developed that offers many different custom designs for diesel and petrol engines, passenger cars, commercial vehicles and motorcycles. These include an OAP manufactured partly to aircraft specifications, which is used in the Schaeffler Audi A4 DTM. For reader enquiries, please mention PTR: Schaeffler (UK) Ltd, Forge Lane, Minworth, Sutton Coldfield, West Midlands, B76 1AP Tel: 0121 313 5870 Fax: 0121 351 7686 Email: info.uk@schaeffler.com www.schaeffler.co.uk
www.megadyne.it www.megadyne.co.uk Megadyne UK Ltd Unit 1 The Washington Centre, Halesowen Road, Dudley, West Midlands, DY2 9RE Tel: 01384 215021 Fax: 01384 215022 Contact: sales@megadyne.co.uk ACCULINK detachable vee belting in A & B section Megadyne XDV2 belts for the lawn and grass sectors The all new “Platinum” range of 8 and 14mm pitch timing belts.
Page 1 and 2: & The ONE leading voice for the Flu
Page 3 and 4: Nov/Dec 2011 P&TR 3 This month from
Page 5 and 6: Pennine Pneumatic Services celebrat
Page 7 and 8: Exclusive system of premium enginee
Page 9: Brammer fundraisers for Make-A-Wish
Page 13 and 14: Diageo receives award for Business
Page 15 and 16: Stema wins major contract for tyre
Page 17 and 18: ROD ENDS, SPHERICAL BEARINGS & LINK
Page 19: Nov/Dec 2011 P&TR 19 Closer to Home
Page 23 and 24: Arrow Engineering Components Ltd Kn
Page 25 and 26: Adhesives & Sealants Loctite Unibon
Page 27 and 28: Rubber Top Hollow & Extended Pins S
Page 29 and 30: Nov/Dec 2011 P&TR 29 Abssac on the
Page 32: As well as a huge stock of standard

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