Carrelli rigidi

1. Carrelli rigidi Bogies

2. Carrelli (bogies)

3. Caratteristiche funzionali

4. Vincoli

5. Trave oscillante Piastra di guida Pendini SP Sospensione secondaria Piastre di guida Longherone Boccola SS Sosp. Primaria Pendino Arresti Bilanciere Carrello tradizionale

6. Appoggio laterale cassa Longherone Traversa telaio Ralla portante Sala Trave oscillante

7. Carrello Fiat per carrozze - fronte

8. Carrello Fiat per carrozze - pianta

9. Carrello Fiat con frenatura mista

10. Carrello AV

11. Carrello AV

12. Movimenti del carrello

13. Sussulto

14. Beccheggio

15. Rollio

16. Serpeggio

17. Bolster bogie

18. Bolsterless boogie

19. gruppo riduttore longheroni Boccole cuscinetti a rulli. molle a elica traversa ammortizzatore verticale boccola posteriore sedi sospensione secondaria sala montata braccio boccola anteriore dischi freno Schema di carrello ferroviario

20. ammortizzatori laterali trave oscillante ammortizzatori verticali molle a elica Elemento superiore

21. Bolster bogie

22. Traction transfer device Brake disc for trailing bogie Bolster spring Bogie frame Brake disc Lateral dumper Traction motor Axle bearing Axle spring Wheelset Gear

23. Bogie H frame Cross beam Side beam

24. Bogie parts with description Wheel Slide Protection System Lead to Axlebox. Where a Wheel Slide Protection (WSP) system is fitted, axleboxes are fitted with speed sensors. These are connected by means of a cable attached to the WSP box cover on the axle end. Bogie Frame. Steel plate or cast steel. Here is a modern design of welded steel box format where the structure is formed into hollow sections of the required shape. Brake disc. Each wheel is provided with a brake disc on each side and a brake pad actuated by the brake cylinder.Some bogies have two brake cylinders per wheel for heavy duty braking requirements. Bogie Transom. Transverse structural member of bogie frame (usually two off) which also supports the car body guidance parts and the traction motors. Motor Suspension Tube. Many motors are suspended between the transom and the axle. This motor is called "nose suspended" because it is hung between the suspension tube and a single mounting on the bogie transom called the nose. Motor. Normally, each axle has its own motor. It drives the axle through the gearbox. Some designs, particularly on tramcars, use a motor to drive two axles Primary Suspension Coil. A steel coil spring, two of which are fitted to each axle box in this design. They carry the weight of the bogie frame and anything attached to it. Brake Cylinder. When air is admitted into them, the internal piston moves links attached to the piston and causes the brake pads to press against the discs. Shock Absorber. To reduce the effects of vibration occurring as a result of the wheel/rail interface. Lifting Lug. Allows the bogie to be lifted by a crane without the need to tie chains or ropes around the frame. Secondary Suspension Air Bag. Rubber air suspension bags are the secondary suspension system. The air is supplied from the train's compressed air system. Gearbox. This contains the pinion and gearwheel which connects the drive from the armature to the axle.

25. Various axle box suspensions

26. IS type

27. Axle beam type

28. Axle spring with cylindrical laminated rubber

29. Conical laminated rubber type

30. Roll rubber type Roll rubber Axle box

31. Transmissions Nose suspension device

32. Lateral view

33. Hollow-axle parallel cardan driving device Parallel cardan driving device M traction motor K flexible coupling

34. Right angle cardan driving device M traction motor K flexible coupling

35. Rubber axlebox suspension

36. Plate frame bogie suspension

37. Primary suspension

38. Equaliser bar bogie

39. US cast steel bogie suspension

40. Section A- A

41. Bogie with steel primary and air bag secundary sospension

42. Air bag secundary sospension

43. Carrelli sterzabili Steering bogies

44. If the axles are allowed some freedom this wear and noise is reduced, but safety at speed is also reduced. Flexible in longitudinal direction On very sharp curves, the wheel flanges (bordini) contact the rails at an angle, an not only do they wear each other but they also produce a lot of unpleasant noise and vibration. Conventional and steering truck Less wear on flanges and rails occurs at the expense of a more complicated suspension system, with more joints in the bogie mechanism

45. Conventional and steering truck

46. Carrello sterzabile/Steering bogie

47. Bogie frame Steering beam Steering lever and linkage Alignment of link-type forced steering bogie

48. 60 50 40 30 50 110 speed km/h 60 70 80 90 100 Non steering bogie Steering bogie Maximum lateral force kN Radius of curvature 302 m

49. Wheel flange wear Radial steering bogies standard “stiff” bogies

50. Advantages based on experience State-of-the-art radial self-steering bogies are able to steer approx radially in curves of R= 400-600 m. However, on many networks such curves are decisive for the accumulated wheel and rail wear. This is proved in practical trains services to reduce lateral forces, to heavily reduce wheel and rail wear and to increase lateral curving acceleration. With appropriate damping (especially hydraulic yaw damping) running stability is assured at various values of eq. conicity. At the highest speeds (250 km/h + 10 %) conicity should be limited to 0.3 à 0.4(UIC 518 requires 0.3). Testing and experience confirm theory and simulations.