ICF BOGIE PDF
Bogie Bolster Suspension: The bolster rests on the bolster coil .. 2 nos. of lateral shock absorber are being provided in ICF Bogie to be utilized. Roll and it’s Prevention. ❑ Effect of roll on human body. ❖ Type of roll: UCR and LCR. ❑ Prevention not available in ICF bogie. ❑ Anti-Roll bar mechanism in LHB . ICF Bogie – Free download as Powerpoint Presentation .ppt), PDF File .pdf), Text File .txt) or view presentation slides online.
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Integral Coach Factory ICF coaches are conventional passenger coaches used on the majority icff main-line trains in India. The design is also called the Schlieren design based on the location of the Swiss company.
The frame of the ICF coach is a fabricated structure made up of mild steel. Main sub-assemblies of bogie frame bogiee. The sub assemblies are fabricated from flanges, webs, channels and Ribs by welding process. Various types of brackets are welded to the frame for the purpose of primary and secondary suspension arrangement, alternator suspension arrangement and brake rigging arrangement.
It involves 40 meters app. Based on load carrying capacity per axle, the conventional bogie bovie are grouped into two types. They are 13 ton bogie frame and 16 ton bogie frame.
A bogie bolster is the central section of the bogie that carries the entire weight of a coach’s under frame. The bogie bbogie around it using the center pivot pin. It couples to the bogie frame at each end using the secondary suspension system typically coil springs and spring plank.
A center pivot pin is bolted to the body bolster. The center pivot pin runs down vertically through the center of the bogie bolster through the center pivot. It allows for rotation of the bogie when the coach is moving on the curves.
A silent block, which is cylindrical metal rubber bonded structure, is placed in the central hole of the bogie bolster through which the center pivot pin passes. It provides the cushioning effect. The wheel set assembly consists of two pairs of wheels and axle. The wheels may be cast wheels or forged wheels. At times, imported wheels are also used. These wheels and axles are machined in the various railway workshops in the wheels shops and pressed together.
Lcf bearings are used on bogis ICF coaches. Before fitting the roller bearing, an axle collar is press fitted. The collar ensures that the bearing does not move towards the center of the axle. After pressing the collar, a rear cover for the axle box is fitted. The rear cover has two main grooves.
In one of the grooves, a nitrile rubber sealing ring is placed. The sealing ring ensures that the grease in the axle box housing does not seep out during the running of the wheels.
A woolen felt ring is placed in another groove. After the rear cover, a retaining ring is placed. The retaining ring is made of steel and is a press fit.
The retaining ring ensures that the rear cover assembly is secured tightly between the axle collar and the retaining ring and stays at one place. The roller bearing is pressed after the retraining ring.
Earlier, the collar and the bearings were heated in an oil bath. But now the practices has been discontinued and an induction furnace is used to heat them before fitting on the axle. The axle box housing, which is a steel casting, is then placed on the axle. The bearing is housed in the axle box housing.
Axle box grease is filled in the axle box housing. Each axle box housing is filled with approximately 2. The front cover for the axle box is placed on a housing which closes the axle box.
The front cover is bolted by using torque wrench. ICF coaches use two types of brake beams. Both of the brake beams are fabricated structures. The brake beam is made from steel pipes and welded at the ends. The brake beam has a typical isosceles triangle shape. The two ends of the brake beam have a provision for fixing a brake head.
The brake head in turn receives the brake block.
The material of the brake block is non-asbestos and non-metallic in nature. Two types of brake heads are used. A brake head is a fabricated structure made up of steel plates welded together.
Brake blocks are also of two types. These levers are connected to the main frame of the bogie with the help of steel brackets. These brackets are welded to the bogie frame. bbogie
Various type of levers are used on the ICF coaches. The typical levers jcf the “Z” lever, floating lever and the connecting lever. These levers are used to connect the brake beam with the piston of the brake cylinder. Conventional coaches are those ICF coaches in which the brake cylinder is bogid on the body of the coach and not placed on the bogie frame itself.
Traditionally, the ICF coaches were conventional type i.
However, bobie the later modification, the new bogies are being manufactured with the BMBC designs only. Even the old type bogies are being converted into BMBC coaches. The foremost being that, since the brake cylinder is mounted on the bogie frame itself and is nearer to the brake beam, the brake application time is reduced. Moreover, a small brake cylinder is adequate for braking purpose.
This also reduces the overall weight of the ICF coach apart from the advantage of quick brake application. The primary suspension in an ICF coaches is through a dashpot arrangement. The dashpot arrangement consists of a cylinder lower kcf seat and the piston axle box guide.
Axle box springs are placed on the lower spring seat placed on the axle box wing of the axle box housing assembly. A rubber or a Hytrel washer is placed below the lower spring bovie for cushioning effect. The axle box guide is welded to the bogie frame. The axle box guide acts as a piston. A homopolymer acetyle washer is placed on the lower end of the axle box guide.
The end portion of the axle box guide is covered with a guide cap, which has holes in it. A sealing ring is placed near the washer and performs the function of a piston ring. The axle box guide moves in the lower spring seat filled with dashpot oil. This arrangement provides the dampening effect during the running of the coach. The dashpot arrangement is mainly a cylinder piston arrangement used on the primary suspension of Indian Railway coaches of ICF design.
The lower spring seat acts as a cylinder and the axle box guide acts as a piston. Protective Tube Upper Rubber Washer.
Axle Box Guide Screw with sealing washer The axle box guide piston is welded to the bottom flange of the bogie side frame. Similarly, the lower Spring seat cylinder is placed on the axle box housing wings forms a complete dashpot guide arrangement of the ICF design coaches. Idf box guides traditionally had a guide cap with 9 holes of 5mm diameter each; however, in the latest design, the guide cap is made an integral part icr the guide.
Air vent screws are fitted on the dashpot for topping of oil so that the minimum oil level is maintained at 40mm. Traditionally, rubber washers have been used at the seating arrangement of the primary springs of the axle box housing in the ICF design passenger coaches on the Indian Railways. The rubber washer is used directly on the axle box seating area.
On the top of spring seat, a polymer ring called NFTC ring sits. The primary spring sits on the NFTC ring.
Rail Maniac: ICF BOGIE ( DETAILED )
The lower spring seat plays the role of a cylinder in the dashpot arrangement icv is filled with oil. In the dashpot arrangement, the top portion is called the axle box guide. The axle box guide works as a piston in the Lower spring seat filled with oil. This helps ocf damping the vibrations caused during running train operation. The axle box guide, which is welded to the bogie frame has a polymer washer homopolymer acetal guide bush fixed at the head.
A polymer packing ring and a guide ring is attached with the Acetal guide bush. These two components act as piston rings for the axle box guide. In order bogue ensure that the packing ring and the guide ring retain their respective place, a dashpot spring is fixed which applies continuous pressure on the piston ring.
The bottom of the axle box guide icc a guide cap with perforations so that during the downward movement of the axle guide in the lower spring seat, the oil in the dashpot rushes in the axle box guide.
Bogi provides the dampening of vibration in a running coach. The guide cap is fixed with the help of a steel circlip. However in the new design of Axle box guide, the guide cap is welded with the guide assembly and hence the need of a guide cap has been eliminated. The complete guide and lower spring arrangement is covered with a bohie cover also known as protective tube.
The protective tube has a circular ring over it called the dust shield which prevents the ingress of the dust in the cylinder piston arrangement of the dashpot.