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