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EXTERNAL COOLING DESCRIPTION For those applications requiring external cooling, the pitot tubes scoop the oil from the rotating column of oil within the Model CBA's housing. This oil contains the engagement heat. The oil is then pumped through passages drilled in the quill support member to an external cooler where the engagement heat is removed. Cooled oil returns through a different set of passages drilled in the quill support member and is introduced through a series of orifices directly into the center of the clutch and brake disc packs. This oil provides the cooling for the disc packs and removes the heat of engagement. It then returns to the rotating column of oil where it is again removed by the pitot tube pumping system and delivered to the cooler to repeat the cycle. |
The pitot tube pumping system is bi-directional and will pump oil from either direction of rotation. Being a centrifugal type pumping system, its output is related to the speed of rotation. This closely matches the cooling oil requirements of the disc packs since engagement energy is also related to the speed of rotation in the same manner. This system is completely self-contained and requires no additional energy source other than housing rotation. If the housing rotates, oil is delivered in the correct quantity to the disc packs. Low pressure switches,(indicating low oil level), as well as hi-temperature switches, and a filter are normally included as shown to complete the cooling lube system. |
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