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Purpose:
The Haldex Sealed DDSB is engineered to deliver the lowest operating cost service, parking, and emergency braking package in a single compact unit.
Optional sizes/combinations (24/24, 24/30, 30/30 and 30/36) are designed to match the braking requirements of different capacity axles and severe operating environments.
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Acids & Liquid
Corrosives |
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Dry Bulk Chemicals |
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Fertilizer |
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Petroleum Products |
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Ready-Mix Concrete |
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Refuse Collection |
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Salt |
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Toxic Waste |
Operation:
The operating principal is sound and simple. There are two sections to a DDSB (double diaphragm spring brake)
assembly.
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The front section is the service brake section that operates like any other service brake chamber, in that it converts modulated air pressure from the brake valve into a mechanical force to apply the foundation brakes.
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The rear section is the emergency/parking section and contains a very strong coil spring that applies the brake mechanically when air pressure is
exhausted / loss.
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The coil spring is held compressed by air pressure from the main air system. If the air pressure is removed for any reason (driver applying park brakes or catastrophic failure in the air system), the force of the coil spring is transmitted through an internal pushrod to the service brake pushrod, applying the brake.
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Features and Benefits: |
| Tamper-resistant
spring housing |
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Eliminating the potential of serious
injury
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Special
electro deposited epoxy coating |
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Providing superior corrosion resistance for
non-pressure housing, power spring housing, and power spring
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Externally
stored release bolt w/hardened steel washer |
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Which reduces service time and caging
effort
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Fatigue
resistant diaphragm push plate |
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With riveting providing a safe, secure, permanent attachment
system
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Orange
stroke indicator |
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Shows the operator at a glance if the brake is in adjustment or if it needs
servicing
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Captive
dust plug |
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Reducing the long-term chances of
contamination
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Delrin
center guide bearing |
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Reduces friction and gives longer life
expectancy
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Low
profile super duty non-pressure housing |
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Epoxy coated nine-gauge steel provides superior impact and corrosion
resistance
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Large
head mounting studs |
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Of Grade 5 steel that are press fit into the
non-pressure housing giving a reinforced mounting surface which reduces
fatigue |
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