LHB FIAT BOGIE ( DETAILED )

LHB (LINKE HOFMANN BUSCH) FIAT BOGIE

FIAT-SIG BOGIE AT RCF

VARIOUS PARTS OF THE LHB RAKE

WHEEL AND AXLE ASSEMBLY

This is the  part of a rake which is just adjacent to the tracks. It basically consists of four main parts. 

   a) Wheel

 b) Axle

 c) Bearing and Housing 

WHEEL  

Wheel of a rake is a specifically made cylindrical portion having an outer edge shape   to fit in the railway track. The material is stainless steel.

AXLE

 Axle is the main long cylindrical bar on which wheels are fixed with the help of bearings. This is also made of stainless steel as above. Each axle contains 2 wheels, the brake cylinders are also attached to it and in case of LHB coaches, the braking discs are fixed on to the axle

COMPONENTS OF WHEEL AND AXLE ASSEMBLY

• Two brake disks (4), diameter 640 mm and width 110 mm
• In built slack adjusting brake cylinder fitted
• Two wheel disc of tread dia 915 (New), 845 (worn).

Axle Bearings

A taper roller cartridge type bearing is used and it makes up a preassembled unit. The axle bearings on the bogie are fitted with sensors for detecting speed (whose signal is elaborated by the anti slipping system) and a current return device.

The ends of the control arms are fitted with centering devices for the primary suspension spring assembly. The bearing lubricating plug is fitted in the lower part

1. Double cup

2. Sealing system

3. Backing ring

Bogie frame

The bogie frame is a solid welded frame made by steel sheets and forged or cast parts.

The frame is made up of two longitudinal components (1) connected by two cross-beams (2) which also support the brake units. The various supports which connect the different bogie components are welded to the frame. The bogie frame rests on the primary suspension spring units and supports the vehicle body by means of a bolster beam. The bolster beam is connected to the bogie frame by the secondary suspension.

1.Bogie frame longitudinal component

2. Cross-beam

Primary suspension

Primary suspension is implemented by two units of two steel coil springs (internal (4) and external (5)) laid out on the control arm upper part (13) by a centering disk (8) and adjustment shims, (if required).

The suspension is also completed by the following components:

·     A control arm (13), fitted with twin-layer elastic joints (12), connecting the axle bearing to the bogie frame and transmitting, not stiffly, lateral, longitudinal and part of the vertical forces;

·      A vertical damper (14).

Rubber elements (2) separate the primary suspension from the bogie to realize noise reduction.

Stops and protections are mounted on the bogie frame for the lifting. 

1. Bogie frame

2. Rubber disks

3. Centering disk

4. Internal spring

5. External spring

6. Bump stop

7. Shim

8. Centering disk0

9.  Control Arm Lower Part

10. Plate

11. Block                                                  

12. Rubber joint

13. Control Arm Upper Part

14. Damper

       

      
      Secondary suspension

 

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The secondary suspension enables lateral and vertical displacements and bogie rotation with respect to body when running through curves.

It is implemented by two spring packs (A, FIG. 4-4) which sustain the bolster beam (1) over the bogie frame (6). Each spring pack is made up by an internal (3) and an external spring (4), mounted and positioned through the centering discs (5).

An anti-roll bar (2), fitted on the bogie frame (6), realizes a constant, reduced inclination coefficient during running.

The bogie frame is linked to the bolster beam through two vertical dampers (7), a lateral damper (8), four safety cables (9) and the traction rods (10).

The bogie frame is also linked to the coach body through two yaw dampers (11).

 

                1.  Bolster beam

                2.  Anti- roll bar

                3.  Internal spring

                4.  External spring

                5.  Centering disk

                6.  Bogie frame

                7.  Vertical damper

                8.  Lateral damper

                9.  Safety cables

              10. Traction rod

              11.  Yaw damper

     Anti Roll Bar :

Torsion bar with two forks between bogie frame & bolster connected by Roll links.
Resists the Rolling motion of Coach.
As Per UIC 515-1 Tilting Coefficient <0.4