In addition, automobile brake system is an essential element to measure the performance of an automobile. None of the different types of brake fluids should be mixed. This system makes it all happen quick in an emergency, however it allows it to happen slow and not that aggressive in a normal stopping condition. The rotor is driven by the vehicle through its axle, propshaft, transmission and clutch and its rotation causes the retarder oil to undergo centrifugal. The brake power is independent of the engine temperature, and amounts to max. The retarder works by absorbing energy during the compression stroke, and throwing away this energy through the exhaust valves as the piston completes its compression stroke. Control systems or parts thereof, in general or specially adapted for vehicles, for processing variables which influence the extent or duration of a braking event, for the following purposes. Automatic retarder when the automatic retarder is activated and you depress the brake pedal, the retarder and wheel brakes work together. Furthermore, brake wear control ensures that the brake. Designed to be mounted on driveshafts, gearboxes or drive axles, this wide range provides solutions to a large variety of vehicle configurations. According to the web site of the american society of mechanical engineers, brake retarders allow truckers to slow vehicles without causing additional wear to the conventional brake system. Retarders for heavy vehicles deep blue university of. In addition to these safety benefits, appropriate use of an auxiliary braking system will extend the life of the service brakes, reducing cost and frequency of maintenance.
Since the capacity of the retarder or its retarding action is directly related to its rpm, it will be most effective at higher engine and vehicle speeds. Eddy current is a circular current produced along coil windings that generates both heat and resistance to movement. The degree of retardation can bevaried by adjusting the fill level of the chamber. Repeated stops at 60 mph with drum brakes can double the stopping distance due to brake fade.
Auxiliary braking systems more likely to brake hard and frequently. The caterpillar brake saver is the most popular retarder in this class. Brakeretarder article about brakeretarder by the free. This system makes it all happen quick in an emergency, however it allows it to happen. An allison transmission retarder provides secondary vehicle braking via the transmission. Retarders protect the service brakes, thus reducing expenditures on spare parts and maintenance. This is the reason that they began requiring auxiliary braking systems on large fire apparatus. The telma induction braking system product range includes more than 250 retarder variations for road vehicles, providing braking torques of 350 nm to 3600 nm. System structure in buses ebs braking system for buses with no. The department of highways and public works is responsible for ensuring safe and efficient public highways, airstrips, buildings and information systems. Drum brake also has an adjuster mechanism, an emergency brake mechanism and lots of springs.
The braking torque is as high upto 500 kw, depending on the propeller shaft speed and this is about two to three times more braking power than can be delivered by the engine brake. It will take the use of your klam retarder to a new experience, taking away some of the fear factors of. Rule 32015 part 1 rule requirementsland transport rule. The owners advisor contract for yukons newest elementary school has been awarded to colliers project leaders. Ebs electronically controlled brake system in motor coaches. Voith retarders are the lightest in weight among continuous brake systems. As a dot 3 or dot 4 brake fluid absorbs water, its boiling point decreases. Transmission retarders generate a lot of heat and their maximum braking horsepower is usually limited by the trucks cooling system. Furthermore, brake wear control ensures that the brake paddisc wear is uniform throughout their service life. A joystick on the drivers console selects the amount of retardation. The exhaust brake system can also reduce wear of vehicle brakes and. This section addresses the application of retarders both in the downhill braking situation and. Hydraulic retarders are extremely quiet, often inaudible over the sound of a running engine, and are especially quiet in operation compared to engine brakes.
Engines brakes and retarders air suppressor is a device that stops air pulsations. In that way, the retarders help to extend the life span. Since 1946, telma has been the world leader in frictionless braking systems based on the physical principle of electromagnetic induction. This rule addresses heavyvehicle braking, which is one of the most important vehicle. This booklet will cover the most common air brake system designs from 1975 to 2006.
Service brake electromagnetic retarder hydrodynamic retarder. When enabled, the transmission retarder is activated by two different methods. Just like the exhaust brake, the compression brake using the pumping action of an internal combustion engine to create braking power. For these purposes the retarder functions are fully integrated in the service brake operation.
It was the first practical mechanism for altering on demand the valve timing on a. The retarder should be regarded as an integrated part of the brake system, and it must be factory mounted as it cannot be retrofitted. Telmas unique expertise in the field of induction braking systems has been built on over seventy years of presence in the market. Gang voith retarder 32 3750nm average engine 1600 min1 100 kw 200 kw 300. The exhaust brake system is used to supplement the function of the primary braking system. The target of this thesis is to people get more information about automobile brake system and study some basic maintenance methods. The shoes are pulled away from the drum by the springs when the brakes are released. This feature helps to decelerate the vehicle and maintain a steady speed on declines. The electric retarder the electric retarder uses electromagnetic. Klam electro magnetic retarder the new electronic retarder control system called ecs has many features and benefits to suite your requirements. This leads to a rapid reduction in braking efficiency. Vehicle modifications to facilitate cooling of brakes. The jake brake permits large trucks to descend long, steep grades at a controlled speed.
Mx engine brake the mx engine brake is a hydraulically operated compression brake combined with a butterfly valve in the exhaust system. The retarder control valve is signaled to open, allowing oil to. It is no surprise that endurance brakes in buses and trucks are a legal requirement throughout europe. Home ordnance documents and other related manuals engine retarder system od162070117. March 2003march 2003 fire apparatus driveroperator 1afire apparatus driveroperator 1a slide 21144. Loosen the screws from intermediate flange and remove it. Nov 01, 2015 a retarder is a device used to augment or replace some of the functions of primary frictionbased braking systems, usually on heavy vehicles. Iso 2226swg 6 retarders test procedures for type approval wd 12161. For adjusting wheelbraking force to meet varying vehicular or groundsurface conditions, e. Brake retarder a device used to decelerate a motor vehicle, principally when the vehicle is traveling on long downgrades. Working of drum brakes drum brakes work on the same principle as the disc brakes. Frictionbased braking systems are subject to brake fade. Transit bus air disc brake operation and wheels on.
Telma induction braking systems dissipate the braking energy by generating eddy currents. The air pressure gauge tells you the adequacy of the air system. The ebs optimises brake management by utilising the effects of the retarder or engine brake to reduce load on the wheel brakes. This retarder operates on the torque converter principle. Brake retarders improve road safety and augment the functioning of wheel brakes. The principle behind the engine retarder brake is that it changes the action of the exhaust valves, turning the engine into an air compressor. Auxiliary braking systems compression brake a compression brake system was first commercially available starting in 1961 from the jacobs manufacturing company, commonly referred to as the jake brake. Frictionbased braking systems are susceptible to brake fade when usedextensively for continuous periods, which can be dangerous if.
Antilock braking system abs abs training 2 antilock braking system abs purpose antilock brake systems abs generally also referred to as antilock systems als are designed to prevent the vehicle wheels from locking as a result of the service brake being applied with too much force, especially on slippery road surfaces. Motorcoach brake systems and safety technologies fmcsa. The permanent hydrodynamic endurance brake system ensures reliable, wearfree braking. The braking force may vary due to retarder charactaristic.
Use of engine retarder brakes engine retarder brakes are used in many heavy trucks as a supplement to the vehicles service brakes. Telma induction brakes, commonly known as electrical or electromagnetic retarders, offer an endurance braking system. Review of retarder used as braking system in heavy vehicles. Retarders a retarder is a device used to boost or replace some of the functions of primary frictionbased braking systems, usually on heavy vehicles. Hydraulic retarders are extremely quiet, often inaudible over the sound of a running engine, and are especiallyquiet in operation compared to engine brakes. Transmission retarders are usually more effective than engine brakes at lower rpms. Retarders serve to slow vehicles, or maintain a steady. Road vehicles endurance braking systems of motor vehicles. Antilock braking system abs and antislip regulation asr. Department of highways and public works government of yukon.
During this time telma managed to establish the industry standards and make a. Brake fade is a function of the type of brake system drum vs. This protects the service brakes and ensures they are always available. The performance of brake system directly affects the other properties of the vehicles. Increasing speed by 25% from 60 mph to 75 mph can double the stopping distance for both drum and disc brakes. On hydraulic brake vehicles there may be a rotary switch mounted with a bracket to the brake pedal. The transmission retarder is enabled by a switch on the drivers console. A retarder is a device used to augment or replace some of the functions of primary frictionbased braking systems, usually on heavy vehicles. Telmas unique expertise in the field of induction braking systems has been built by more than sixty years of presence on the market, during. Auxiliary brake system is developing rapidly, therefore, all kinds of vehicles, hydraulic retarder is one of the important auxiliary braking form. Biggest downfall on the hydraulic retarder is the heat absorbed by the transmission oil.
The dawson city ice bridge is now open to heavy traffic up to 40,000 kilograms. Retarders serve to slow vehicles, or maintain a steady speed while traveling down a hill, and help prevent the vehicle from running away by accelerating down the hill. When the brakes are released, all the brake actuators are exhausted immediately. Since more than 60 years, telma has been the world leader in friction free braking systems based on the physical principle of electromagnetic induction. This retarder system is manufactured by the jacobs manufacturing company, and their product is available for. Classic friction brakes can reach temperatures of up to degrees under demanding conditions such as adaptive braking on the highway or on long downslopes. The pressure transducer or rotary switch sends an analog. The most popular engine compression retarder is the jake brake. Bus air brake system training home american public.
Frictionbased braking systems are susceptible to brake fade when usedextensively for continuous periods, which. The compressed air brake system is controlled at the compressor outlet from the group apu air processing unit, comprises an air dryer with heating, a pressure regulator, a fourway distributor and two external sockets. The retarder is an auxiliary brake and brakes the driving wheels. They will avoid damage to the system components or serious personal injury, or both. Our company telma, over 60 years of existence and world leader in secondary electromagnetic retarders. For the retarder to work as effectively as possible, the engine speed should be over 1,800 rpm. Clutch switch is a switch that disengages the compression brake when the clutch is depressed. In a normal torque converter, vanes on the input housing which is attached to the engine crankshaft transmit power through the fluid coupling to the output shaft vanes of the torque converter, which is connected to. First practical mechanism for braking large trucks with engine compression as they descend long, steep grades at controlled speeds. Retarder assembly how to remove retarder assembly special instructions warning. Operating principle telma induction brakes, commonly known as electrical or electromagnetic retarders, offer an endurance braking system. The speed of the test bench may due to the variation or force.
Retarder switch on, joy stick in zero position fully forward on my coach, let off the power, no retard. Zf intarder the zf intarder is a hydrodynamic retarder. The retarder pays for itself, often in less than 2 years. The ecs retarder control system has a diagnostic tool that allows the driver owner to locate a failure and report. On air brake vehicles there is an air pressure transducer connected to the primary delivery line of the braking system to activate the retarder. Frictionbased braking systems are susceptible to brake fade when usedextensively for continuous periods, which can be dangerous. The ecs retarder control system can be programmed and adjusted for your needs and the vehicle retarder application. Air compressor and air system pressure you should be aware of common air pressure thresholds of your motorcoachs brake system. Heavyvehicle brakes 2006 is one of a series of rules that sets safety requirements and standards for systems and components in vehicles operating in new zealand. It can absorb water from air, that is why we should avoid opening the cars brake fluid reservoir and the container of the brake fluid should be tightly sealed. This will allow you to adjust the retarder system to the requirements of the customer. Troubleshooting common transit bus scam and air brake complaints apta btsbcrp00617. At the same time, transport capabilities increase due to higher average speeds.
It was the first practical mechanism for altering on demand the valve timing on a truck diesel engine, thereby converting the engine to a power absorbing machine. Secondary brake systems engine retarders compression brake uses engine to brake turns engine into energy absorbing air compressor exhaust brake uses exhaust from engine to brake works opposite compression brake. The brake retarder systems are sometimes referred to collectively as jake brakes in reference to the original device, the jacobs engine brake. With voith retarders, up to 90 percent of all braking actions can be performed without wear. Electrical system general the auxiliary brake control unit is microprocessor.
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