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| Sunday, 23 March 2003 |
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Features |  |
| News Business Features Editorial
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DIMO teams up with Akzo Nobel Diesel & Motor Engineering Co. Ltd. (DIMO) entered into an agreement with Akzo Nobel, headquartered in Netherlands, to import marine coatings and other range of Akzo products. Headquartered in the Netherlands, Akzo Nobel is a market-driven and technology-based organization, serving customers around the world with coatings, chemicals and health care products. Akzo Nobel has activities in 75 countries and is a leader in product development, manufacturing and marketing. To maintain versatility, Akzo Nobel conducts its activities through a decentralized business unit structure to respond effectively to the demand of diverse markets. Akzo Nobel employs over 68,000 people worldwide. Realizing that future growth and success depends on our customers and employees, Akzo Nobel invests in the training and continual development of our workforce to better serve customers. For over 100 years, the company has successfully provided solutions to the global marine industry's constantly evolving needs and earned a reputation of trust and quality. International marine coatings are engineered to deliver proven performance in service whilst representing value for money. Environmental responsibility is a major feature of the marine coatings offer, particularly in terms of new product introductions and the latest global research programmes. ANCIPL operates in the businesses of: 1. Marine Coatings 8. Industrial Coatings ANCIPL was awarded the ISO 9002 Quality System certificate in 1999, and became the first ever coatings company to be awarded the prestigious ISO 14001 Environmental Management System certificate in January 2000. ############ Know your brakes If you have any problems regarding automotive engineering, please do not hesitate to contact us on: Director, Hydraulic brakes The purpose of brake system in motor vehicle is to slow it down or stop it or else to keep it stationary. Basically there are three types of brake systems used in motor vehicles. There are mechanical brakes, hydraulic brakes and air brakes. You can see mechanical brakes in very old motorcars. Normally in a module vehicle, parking brake (hand brake) works on a mechanical system. Air brakes are for heavy vehicles like buses, lorries, semi-trailer and trucks. This system operates on power of air pressure, which creates by compression. Hydraulic brakes are the most popular braking system in motor vehicles. It works on hydraulic oil pressure, which is produced by a master cylinder. Modern hydraulic brakes are electronically controlled A.B.S. (Anti-Lock Brake System). You can get more information of A.B.S. in our later articles. The hydraulic brake consists of the brake pedal, a master cylinder, hydraulic lines (pipes and flexible hoses), the wheel brake cylinders and the wheel brake shoes. The principle on which hydraulic brakes operate is based on Pascal's Law, which states the pressure applied to liquid enclosed on all sides is propagated uniformly in all directions. This principle ensures that same working pressure is built up in all wheel cylinders. Hydraulic transmission of braking force is usually arranged to step up the transmitted force at the same time. Master Cylinder The master cylinder builds up the pressure in the brake system. The brake pedal actuates the master cylinder. We can see some rubber washers, piston and springs inside the master cylinder. This piston moves in a forward direction when depressing the brake paddle. Then the brake oil builds a pressure, which is in front of the piston. To keep it firm from leaking to out side there are some brake washers in the front an rear of the piston. The brake oil is stored in the oil reservoir. Normally it is fitted at the top outside of the master cylinder. But in some modules the reservoir tank is fitted at a little distance to the master cylinder. However, the pressurized brake oil is delivered into the pipelines. The wheel brake cylinders receive this pressurized oil and actuates. For safety reasons, it is often reinforced by national legislation. Brake systems are almost always divided into two separate circuits. It is a dual-circuit brake system A and commonly called "Tandem Master Cylinder". If one brake circuit should fail the vehicle can still be stopped or slowed down by the other circuit. For example if the real wheels hydraulic brake oil line fails due to leakage or damage, the front wheel will still provide braking action. Vacuum Servo Unit This unit is fixed with the master cylinder. You can see this unit behind. The master cylinder has the shape of a cylinder and is black in colour outside. Function This Vacuum Servo Unit permits the driver to easily brake the vehicle by exerting only a little pressure on the brake pedal. The Servo Unit does most of the work required for braking. This unit therefore makes braking operation easy, lessens driver fatigue and enhances safety. This unit operates by vacuum. The required vacuum is created by the engine inlet manifold. This is for petrol engines, there is a special vacuum pump (exhauster) on one Alternator to create vacuum. However, the vacuum is connected to this unit by a small rubber tube. If you stopped the engine there is no vacuum in the unit. The pedal is stiff. So this unit works only when the engine is running. Wheel Brakes You can find two types of wheel brakes in a hydraulic brake system. They are: 1. Drum brakes and; 2. Disc brakes. Drum brakes Drum brakes are normally used for rear wheel brakes. It consist of a brake drum, two brake shoes, wheel cylinders and shoe-return springs. The wheel cylinder has two pistons, which are on its inside. Those pistons moves outward due to pressurized brake oil, which comes from the master cylinder. |
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