PCV assembly and fitting
AssigneeGeneral Motors Corporation
InventorThomas A. Spix
Life of this patent
Estimating the term…
Abstract
A PVC assembly includes a tubular fitting which significantly reduces the possibility of vapors freezing so as to block the PCV passage entry into a manifold. The fitting may be a material, such as nylon, with low heat conductivity as compared to a metal fitting and which is thermally isolated by an air gap from the PCV inlet opening of an aluminum metal manifold to minimize heat loss to the manifold walls. A mounting portion of the fitting includes a primary seal and a secondary seal/retainer that provides backup sealing and also acts as a snap-in retainer that releasably holds the fitting in the manifold PCV inlet opening without further retaining means. A simplified inlet fitting with both retaining and heat conserving features is thereby provided.
Claims13
A PCV fitting for connecting an engine positive crankcase ventilation (PCV) conduit with an intake air passage defined by a wall of an air intake member, the fitting comprising:
- a one piece tubular body having inlet and outlet ends and defining a fluid passage extending between the ends;
- the body formed of an oil and heat resistant plastic material;
- a mounting portion between the ends and mountable to the wall of the air intake member;
- a connecting portion on the inlet end and adapted for connection with the PCV conduit;
- and
- an isolating portion adjacent the outlet end and adapted to extend with an air gap through the wall into the intake air passage, the isolating portion being cantilevered from the mounting portion.
A PCV (positive crankcase ventilation) assembly comprising:
- an air intake conduit having a wall defining an engine air intake passage;
- a boss on the wall and having an inlet opening extending therethrough into communication with the air intake passage at an inner end of the boss adjacent an isolation bore of the inlet opening;
- and
- a PCV fitting mounted in the inlet opening and extending beyond the boss into the air intake passage, the fitting having a one piece tubular body with inlet and outlet ends and defining a fluid passage extending between the ends, the inlet end adapted to receive crankcase vapors for delivery into the air intake passage;
- the fitting including an isolating portion adjacent the outlet end and cantilevered from a mounting portion, the isolating portion extending within, and spaced by an air gap from, the isolation bore of the inlet opening, the air gap being effective to limit heat transfer between the isolating portion of the fitting and the wall of the air intake conduit;
- the material of the body of the fitting having significantly lower thermal conductivity than a metal manifold material.
Dependencies are inferred from the claim text.