Ceramic valve guide with two internal diameters
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Oct 3, 2000
Grant Date -
N/A
app pub date -
Dec 10, 1998
filing date -
Dec 10, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Ceramic valve guides capable of withstanding high temperature ranges are typically used in high efficiency internal combustion engines. In very large engines these ceramic valve guides can be quite long and forming the required through bore in the ceramic valve guide to accommodate a stem of a valve can be extremely time consuming. A ceramic valve guide assembly is disclosed that provides a simple and economical means for creating a ceramic valve guide assembly. In one embodiment, the valve guide assembly comprises a first valve guide sleeve that is identical to a second valve guide sleeve. Each valve guide sleeve includes a guide bore having a first diameter and a secondary bore having a second diameter. The second diameter is larger than the first diameter. The secondary bore of the first valve guide sleeve is placed adjacent the secondary bore of the second valve guide sleeve and the first valve guide sleeve is secured to the second valve guide sleeve, preferably by an outer sleeve. The first diameter of the guide bore is chosen to be in close fitting engagement with a stem of a valve while the second diameter is not in close fitting engagement. In a second embodiment, the valve guide sleeves are formed as a single unit to produce a one piece valve guide assembly.
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