Disc Brake Axle

Disc brake is a brake way connected to the wheel and/or the axle . To retard the wheel, friction material in the form of brake pads, mounted on the brake caliper, is forced mechanically Disc brake axle is a new products popular in the developing and developed countries , and it’s a tendency of...

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Disc brake is a brake way connected to the wheel and/or the axle. To retard the wheel, friction material in the form of brake pads, mounted on the brake caliper, is forced mechanically


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Disc brake axle is a new products popular in the developing and developed countries  , and it’s a tendency of this industrial to instead the traditional one .

disc brake is a type of brake that uses calipers to squeeze pairs of pads against a disc or "rotor" to create friction.This action retards the rotation of a shaft, such as a vehicle axle, either to reduce its rotational speed or to hold it stationary. The energy of motion  is converted into waste heat which must be dispersed.

Hydraulically actuated disc brakes are the most commonly used form of brake for motor vehicles, but the principles of a disc brake are applicable to almost any rotating shaft.


Brake disc

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Front automobile brake with rectangular open slots visible between  the disc's friction surfaces

The brake disc (or rotor) is the rotating part of a wheel's disc brake assembly, against which the brake pads are applied. The material is  typically gray iron,a form of cast iron. The design of the discs varies somewhat. Some are simply solid, but others are hollowed out with fins or vanes joining together the disc's two contact surfaces  (usually included as part of a casting process). The weight and power of the vehicle determines the need for ventilated discs. The "ventilated" disc design helps to dissipate the generated heat and is commonly used on the more-heavily loaded front discs.

Discs for motorcycles, bicycles, and many cars often have holes or slots cut through the disc. This is done for better heat dissipation, to aid surface-water dispersal, to reduce noise, to reduce mass, or for marketing cosmetics.

Slotted discs have shallow channels machined into the disc to aid in removing dust and gas. Slotting is the preferred method in most racing  environments to remove gas and water and to deglaze brake pads. Some discs are both drilled and slotted. Slotted discs are generally not used on standard vehicles because they quickly wear down brake pads; however, this removal  of material is beneficial to race vehicles since it keeps the pads soft and avoids vitrification of their surfaces. On the road, drilled or slotted discs still have a positive  effect in wet conditions because the holes or slots prevent a film of water building up between the disc and the pads.

A floating disc is splined, rather than rigidly fixed, to the hub as a way of avoiding thermal stress, cracking and warping. This allows the  disc to expand in a controlled symmetrical way and with less unwanted heat transfer to the hub.


Heavy vehicles

Disc brakes are increasingly used on very large and heavy road vehicles, where previously large drum brakes were nearly universal. One reason  is that the disc's lack of self-assist makes brake force much more predictable, so peak brake force can be raised without more risk of braking-induced steering or jackknife on articulated vehicles. Another is disc brakes fade  less when hot, and in a heavy vehicle air and rolling drag and engine braking are small parts of total braking force, so brakes are used harder than on lighter vehicles, and drum brake fade can occur in a single stop. For  these reasons, a heavy truck with disc brakes can stop in about 120% the distance of a passenger car, but with drums stopping takes about 150% the distance. In Europe, stopping distance regulations essentially require disc brakes for heavy vehicles. In the U.S., drums are allowed and are typically preferred for  their lower purchase price, despite higher total lifetime cost and more frequent service intervals.


Ceramic composites

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Mercedes Benz AMG carbon ceramic brake

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Porsche Carrera S composite ceramic brake

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Ceramic discs are used in some high-performance cars and heavy vehicles.

The first development of the modern ceramic brake was made by British engineers working in the railway industry for TGV applications in 1988. The objective  was to reduce weight, the number of brakes per axle, as well as provide stable friction from very high speeds and all temperatures. The result was a carbon-fibre-reinforced ceramic process which is now used in various forms for automotive, railway, and aircraft brake applications.

Due to the high heat tolerance and mechanical strength of ceramic composite discs, they are often used on exotic vehicles where the cost is  not prohibitive to the application. They are also found in industrial applications where the ceramic disc's light weight and low-maintenance properties justify the cost relative to alternatives. Composite brakes can withstand  temperatures that would make steel discs bendable.

Porsche's Composite Ceramic Brakes (PCCB) are siliconized carbon fiber, with very high temperature capability, a 50% weight reduction over iron discs (therefore reducing  the unsprung weight of the vehicle), a significant reduction in dust generation, substantially increased maintenance intervals, and enhanced durability in corrosive environments over conventional iron discs. Found on some  of their more expensive models, it is also an optional brake for all street Porsches at added expense. It is generally recognized by the bright yellow paintwork on the aluminum six-piston calipers that are matched with the  discs. The discs are internally vented much like cast-iron ones, and cross-drilled.



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