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Development of thermoplastic elastomeric vacuum hose for engine control
Technical Paper
2000-05-0150
Sector:
Language:
English
Abstract
Vulcanized rubber hoses are difficult to recycle and have a
complicated manufacturing process. Recently, we have developed the
vacuum hose for engine control out of thermoplastic elastomers. As
a result of this development, scrap material from the manufacturing
process can be recycled and, in addition, about a 30 percent weight
reduction and a 20 percent cost reduction are achievable by virtue
of the lower specific gravity and by the more simplified
manufacturing process.
In order to assess the feasibility of using thermoplastic
elastomers for vacuum hoses, we developed a heat aging simulation
test method. This was achieved by first investigating the actual
vehicle environmental conditions of currently used vacuum hoses by
retrieving and examining these hoses from used vehicles. We then
extrapolated what the condition of such hoses would be after being
subjected to heat aging for 200,000 km of service in an actual
vehicle, and applied this calculation to our newly developed hoses.
We compared the life span of the new thermoplastic elastomeric hose
with that of the current rubber hose by using the Arrhenius
equation, and as a result, we could verify that the new hoses are
usable in actual vehicles.
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