Internal-combustion engines – Charge forming device – Crankcase vapor used with combustible mixture
Patent
1983-09-26
1985-03-05
Lazarus, Ronald H.
Internal-combustion engines
Charge forming device
Crankcase vapor used with combustible mixture
123572, F02M 2700
Patent
active
045024529
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a valve suitable for use in venting gases from an enclosure whilst preventing pressure variation in the enclosure due to suction on the outlet side of the valve and maintaining enclosure pressure at some predetermined function of atmospheric pressure.
DISCLOSURE OF INVENTION
it is desirable that an engine crankcase breather should vent gases from the crankcase to the induction manifold while at th same time preventing suction in the manifold from reducing the pressure in the crankcase. A failure to vent gases may result in the expulsion of oil from the crankcase while a reduction in the crankcase pressure may draw dirt into the crankcase. An object of the present invention is to provide a valve for use in a crankcase breather to avoid the aforesaid difficulties.
A valve according to the invention comprises a rolling diaphragm supported at its outer periphery by an annular support member within which the diaphragm rolls in response to inlet pressure so as to uncover an outlet opening in the support member, thereby to allow the escape of said presure.
An advantage of this valve is that it operates substantially independently of the pressure on the outlet side of the outlet opening. Suction at the outlet opening will simply cause it to be more firmly sealed by the diaphragm.
Preferably, the diaphragm is annular and is supported at its inner periphery by a guide member that engages an abutment when the outlet opening is closed by the diaphragm and guides the diaphragm so that it rolls to uncover the outlet opening.
DESCRIPTION OF DRAWINGS
The invention will be described by way of examlple with reference to the accompanying drawings in which:
FIG. 1 is an axial section through a valve according to one embodiment of the invention,
FIG. 2 is an exploded diagram of the valve of FIG. 1 without the rolling diaphragm,
FIG. 3 is an underside plan view of the upper half of the valve housing, of FIGS. 1 and 2.
FIG. 4 is an underside plan view of the valve member of FIGS. 1 and 2.
FIG. 5 is an axial section through a valve according to another embodiment of the invention,
FIG. 6 is an exploded diagram of parts of the valve of FIG. 5 without the rolling diaphragm.
FIG. 7 is an underside plan view of the intermediate part of the valve of FIG. 5, and
FIG. 8 is a schematic diagram of an engine having a crankcase breather ioncorporating a valve according to the invention.
BEST MODE OF CARRYING OUT INVENTION
The valve illustrated in FIGS. 1 and 2 has a two part housing comprising a lower portion 1 with a cylindrical inlet duct 2 projecting downwards from its base 3, and an upper cover portion 4. A semi-cylindrical formation 5 projects from the side of each housing portion and these formations co-operate to formm an outlet duct 6.
An annular rolling diaphragm 7 is provided within the valve housing between an outer cylindrical support member 8 and an inner guide member 9.
A bead 10 at the outer edge of the diaphragm is held in place in a gallery 11 in the upper end of the support member 8. An annular wall 12 on the underside of the over portion 4 engages the gallery 11 to clamp the bead 10 in place and to locate the support member 8 with its lower end in engagement with a groove 13 in the base 3 of the lower housing portion.
A bead 14 at the inner edge of the diaphragm engages a groove 15 in the outer periphery of a disc-shaped portion 16 of the guide member 9. The guide member has downwardly projecting guide fins 17 that engage within the inlet duct 2 to guide vertical movement of the disc-shaped portion 16. A compression spring 18 between the housing cover portion 4 and the disc-shaped portion 16 serves to urge the latter into engagement with an annular abutment 19 formed in the base of the lower housing portion 1 around the inlet duct 2.
A series of apertures 20 are formed in the wall of the cylindrical support member 8 and are covered by the diaphragm 7 when the guide member 9 engages the abutment 19. However, upwards movement of the diaphragm 7 guided by the guide member a
REFERENCES:
patent: 3144011 (1964-08-01), Anthes
patent: 3620197 (1971-11-01), Albright
patent: 3662724 (1972-05-01), Ohar
patent: 3678910 (1972-07-01), Marlett
patent: 3766933 (1973-10-01), Nicholson
patent: 4125127 (1978-11-01), Harter
patent: 4217870 (1980-08-01), Schleiermacher
patent: 4373499 (1983-02-01), Bendig
patent: 4390036 (1983-06-01), Atnanassiu
Farris Robert L.
Lazarus Ronald H.
Massey-Ferguson-Perkins Limited
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