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Power Transmission, Brakes and Cooling Systems
Published in Iqbal Husain, Electric and Hybrid Vehicles, 2021
Drum brakes, which has been gradually replaced by the disk brakes, use an internally expanding brake shoes that are forced against the inside machined surface of a rotating drum. The drum-type brake units have cylindrical surfaces and shoes instead of pads that hold the friction material. Drum brakes are highly suitable for hand brakes; they are still used in rear wheels of some vehicles. The shoes press against the drum cylinder up on a brake command input from the driver. The shoes can be arranged to press against the outer or inner surface of the rotating drum to retard the wheel rotation. If the shoes are applied to the inner surface, then the centrifugal force of the drum due to rotation will resist disk engagement. If the shoes are pressed against the outer drum surface, the centrifugal force will assist engagement, but at the same time may cause overheating.
Chassis Systems
Published in Dorin O. Neacşu, Automotive Power Systems, 2020
Old cars with drum brakes do not need an electric power assist. A drum brake is a brake that uses friction caused by a set of shoes or pads that press outward against a rotating cylinder-shaped part called a brake drum. Drum brakes are still often applied to the rear wheels since most of the stopping force is generated by the front brakes of the vehicle and therefore the heat generated in the rear is significantly less. Figure 6.1 illustrates a drum brake system.
Chassis systems
Published in Tom Denton, Advanced Automotive Fault Diagnosis, 2020
Drum brakes operate by shoes being forced onto the inside of the drum (Figure 7.4). Shoes can be moved by double- or single-acting cylinders. The most common layout is to use one double-acting cylinder and brake shoes on each rear wheel of the vehicle, and disc brakes on the front wheels. A double-acting cylinder simply means that as fluid pressure acts through a centre inlet, pistons are forced out of both ends.
Airborne exposures associated with the typical use of an aerosol brake cleaner during vehicle repair work
Published in Journal of Occupational and Environmental Hygiene, 2018
Michael Fries, Pamela R.D. Williams, Jerald Ovesen, Andrew Maier
Brake jobs were conducted on four test vehicles based on their prior service history and maintenance schedule. These included two light duty trucks with front and rear disc brakes and a passenger car and mini-van with front disc brakes and rear drum brakes. Drum brakes differ from disc brakes in that all of the brake components are contained in an enclosed drum, which captures more dirt and dust and may require more cleaning than open-air disc brakes. Replacement parts, including pads and rotors (disc brakes) or shoes and drums (drum brakes), were purchased from a local automotive parts store (KOI Auto Parts).
A method for defence product major overhaul analysis focusing on interfaces redesign and extended life supportability
Published in International Journal of Production Research, 2018
Guilherme Eduardo da Cunha Barbosa, Gilberto Francisco Martha de Souza
The major overhaul scope includes the upgrade of drum brakes to disc. Possibly, a RAMS analysis would suggest brake subsystem upgrade, once there were significant failure data. The propagation of these engineering changes will be evaluated according to the proposed method.