Positive crankcase ventilation ("pcv") valve mounting structure

Patent metadata

Field	Value
Publication number	US-2016123199-A1
Application number	US-201514923936-A
Country	US
Kind code	A1
Filing date	Oct 27, 2015
Priority date	Nov 4, 2014
Publication date	May 5, 2016
Grant date	—

Abstract

A positive crankcase ventilation (PCV) valve mounting structure has a blow-by gas passage with an upstream-side passage portion and a down-stream-side passage portion positioned in a cylinder head and an intake manifold, respectively. The blow-by gas passage may receive the PCV valve therein such that an upstream side portion of a valve case of the PCV valve is positioned within the upstream-side passage portion and that a downstream side portion of the valve case is positioned within the down-stream-side passage portion when the cylinder head and the intake manifold are joined together. A gasket may seal the cylinder head to the intake manifold and may include a seal portion positioned between the valve case of the PCV valve and at lest one of the cylinder head and the intake manifold.

First claim

What is claimed is:

1 . A positive crankcase ventilation (PCV) valve mounting structure for mounting a PCV valve to an engine cylinder head and to an intake manifold, wherein the engine cylinder head contacts the intake manifold at a joint surface of the cylinder head and a joint surface of the intake manifold, the PCV valve mounting structure comprising:
a blow-by gas passage with an upstream-side passage portion in the cylinder head and a down-stream-side passage portion in the intake manifold; wherein the upstream-side passage portion and the down-stream-side passage portion allow for fluid communication when the cylinder head and the intake manifold are joined together; wherein the blow-by gas passage is configured to receive the PCV valve therein such that an upstream side portion of a valve case of the PCV valve is positioned within the upstream-side passage portion and that a downstream side portion of the valve case of the PCV is positioned within the down-stream-side passage portion when the cylinder head and the intake manifold are joined together; wherein the PCV valve adjusts a flow of blow-by gas flowing through the blow-by gas passage; and a gasket positioned between the joint surface of the cylinder head and the joint surface of the intake manifold; wherein the gasket includes a seal portion positioned between the valve case of the PCV valve and one of the cylinder head and the intake manifold to form a seal therebetween when the cylinder head and the intake manifold are joined together.

2 . The PCV valve mounting structure of claim 1 , further comprising:
a seal ring that seals the valve case of the PCV valve to the other of the cylinder head and the intake manifold.

3 . The PCV valve mounting structure of claim 1 , wherein:
a receiving-side stepped portion is formed at the joint surface of one of the cylinder head and the intake manifold; an insertion-side stepped portion is formed on the valve case of the PCV valve; and the seal portion of the gasket is interposed between the receiving-side stepped portion and the insertion-side stepped portion.

4 . The PCV valve mounting structure of claim 1 , wherein a seal member of the gasket is arranged to extend into the cylinder head and the intake manifold.

5 . The PCV valve mounting structure of claim 1 , wherein:
the seal portion of the gasket is arranged to extend across the joint surface of the cylinder head and the joint surface of the intake manifold.

6 . The PCV valve mounting structure of claim 1 , wherein the PCV valve is arranged between two adjacent delivery passages formed in the intake manifold for distributing intake air.

7 . The PCV valve mounting structure of claim 1 , wherein the seal portion is formed integrally with the gasket.

8 . The PCV valve mounting structure of claim 1 , wherein the engine includes at least one intake air delivery passage extending across the joint surface of the cylinder head and the joint surface of the intake manifold; and
wherein the gasket is configured to prevent leakage of intake air from the engine via the at least one intake air delivery passage.

9 . A positive crankcase ventilation (PCV) valve mounting structure for mounting a PCV valve to an engine cylinder head and to an intake manifold, the engine cylinder head and the intake manifold being joined together at a joint surface of the cylinder head and a joint surface of the intake manifold, the PCV valve mounting structure comprising:
a blow-by gas passage with an upstream-side passage portion in the cylinder head and a down-stream-side passage portion in the intake manifold; wherein the upstream-side passage portion and the down-stream-side passage portion allow for fluid communication upon joining the cylinder head to the intake manifold; wherein the blow-by gas passage is configured to receive the PCV valve therein such that an upstream side portion of a valve case of the PCV valve is positioned within the upstream-side passage portion and that a downstream side portion of the valve case is positioned within the down-stream-side passage portion when the cylinder head and the intake manifold are joined together; wherein the PCV valve is configured to adjust a flow of blow-by gas flowing through the blow-by gas passage; and a seal accommodation space in the blow-by gas passage between an outer circumferential surface of the valve case of the PCV valve and an inner circumferential wall of at least one of the upstream-side passage portion and the downstream-side passage portion; wherein at least a part of the seal accommodation space is positioned proximal to or across the joint surface of the cylinder head and the joint surface of the intake manifold; and a first seal member disposed within the seal accommodation space such that the first seal member prevents leakage of the blow-by gas from the blow-by gas passage to an outside of the engine between the joint surface of the cylinder head and the joint surface of the intake manifold.

10 . The PCV valve mounting structure of claim 9 , wherein:
the seal accommodation space is defined between a first stepped portion formed at the joint surface of one of the cylinder head and the intake manifold and a second stepped portion formed on the outer circumferential surface of the valve case of the PCV valve.

11 . The PCV valve mounting structure of claim 9 , wherein:
the engine includes at least one intake air delivery passage extending across the joint surface of the cylinder head and the joint surface of the intake manifold; the first seal member is connected to a second seal member; the second seal member is positioned between the joint surface of the cylinder head and the joint surface of the intake manifold and configured to prevent leakage of air.

12 . The PCV valve mounting structure of claim 11 wherein the second seal member is formed integrally with the first seal member.

Assignees

• Aisan Ind

Inventors

• Yamada Shigeki
• Kida Masahiro

Classifications

• F01M13/0011 Primary

  Breather valves · CPC title

• F01M2013/0038

  Layout of crankcase breathing systems · CPC title