Patent EP0343759A1 successfully refreshed from Google Patents.
EP0343759A1
Expired / Lapsed
EP
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Fuel injection pumping apparatus
Assignee: ZF International UK Ltd
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Filing: 1989-01-13
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Granted: —
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Expires: 2009-01-13
Abstract
Abstract A rotary distributor fuel pumping apparatus for supplying fuel to an internal combustion engine has a pair of pumping plungers 20, 21 housed in a diametrical bore 22 formed in the distributor member. The plungers at a predetermined position during their inward movement open a spill path to terminate delivery of fuel through an outlet. The one plunger 20 defines a plunger bore 31 and the other plunger 21 has an integral piston 33 slidable therein. The piston has a relieved portion adjacent the other plunger which with the wall of the plunger bore forms a flow path 36 from the pumping chamber 23 the flow path communicating with a port 34 at a predetermined position during the inward movement. The pumping chamber 23 is of annular form and is defined between the plungers and the wall of the bore 22 in the distributor member and the piston 33.
Inventors
- 👤 Godfrey Greeves
- 👤 Kenneth Maxwell Harris
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 08:14
CPC Classifications
F; F02; F02M; F02M41/00; F02M41/08; F02M41/14; F02M41/1405; F02M41/1411
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
261 words
A fuel injection pumping apparatus for supplying fuel to an internal combustion engine, comprising a rotary distributor member (10) housed in a body part (11) and adapted to be driven in timed relationship with an associated engine, a pair of plungers (20, 21, 47, 48) slidable in the bore, cam means (19) for imparting inward movement to the plungers, passage means (24, 25, 27) for feeding fuel displaced by the plungers during inward movement thereof to outlet ports (26) in turn and for supplying fuel from a source (30) of fuel under pressure to effect outward movement to the plungers, and valve means defined by said plungers, characterised in that one of said plungers (20, 47) defines a plunger bore (31, 49) in which is slidable a piston (33, 51) integral with the other plunger (21, 48), the inner ends of the plungers and the annular space defined about the piston (33, 51) and bounded by the bore (22) in the distributor member, defining a pumping chamber (23) from which fuel is displaced to an outlet (26) during inward movement of the plungers, port means (34, 50) formed in the wall of the plunger bore, through which fuel can escape from said pumping chamber (23), and a reduced portion on said piston (33, 51) adjacent the plunger, said reduced portion defining with the wall of the plunger bore (31, 49) a flow path (36) from said pumping chamber (23) and which is opened to said port means (34, 50) at a predetermined relative position during the inward movement of the plungers.
Claim 2
Dependent Claim
261 words
A fuel injection pumping apparatus for supplying fuel to an internal combustion engine, comprising a rotary distributor member (10) housed in a body part (11) and adapted to be driven in timed relationship with an associated engine, a pair of plungers (20, 21, 47, 48) slidable in the bore, cam means (19) for imparting inward movement to the plungers, passage means (24, 25, 27) for feeding fuel displaced by the plungers during inward movement thereof to outlet ports (26) in turn and for supplying fuel from a source (30) of fuel under pressure to effect outward movement to the plungers, and valve means defined by said plungers, characterised in that one of said plungers (20, 47) defines a plunger bore (31, 49) in which is slidable a piston (33, 51) integral with the other plunger (21, 48), the inner ends of the plungers and the annular space defined about the piston (33, 51) and bounded by the bore (22) in the distributor member, defining a pumping chamber (23) from which fuel is displaced to an outlet (26) during inward movement of the plungers, port means (34, 50) formed in the wall of the plunger bore, through which fuel can escape from said pumping chamber (23), and a reduced portion on said piston (33, 51) adjacent the plunger, said reduced portion defining with the wall of the plunger bore (31, 49) a flow path (36) from said pumping chamber (23) and which is opened to said port means (34, 50) at a predetermined relative position during the inward movement of the plungers.
Claim 3
Dependent Claim
21 words
An apparatus according to Claim 1 characterised in that said port means (50) opens into the interior of the body part.
Claim 4
Dependent Claim
25 words
An apparatus according to Claim 1 characterised in that said port means (34, 46) communicates with a passage (35) formed in the distributor member (10).
Claim 5
Dependent Claim
72 words
An apparatus according to Claim 3 characterised in that said passage (35) communicates with the inner end of a cylinder (37) formed in the distributor member, a piston (38) slidable in the cylinder, a projection (40) on the piston and a seating (41) defined about a port (42) connected to said pumping chamber (23) and a spring (39) acting on said piston (38) to urge the projection into engagement with the seating.
Claim 6
Independent Claim
45 words
An apparatus according to any of Claims 1 to 3 characterised in that said passage (35) communicates with a spring-loaded relief valve (60) which is responsive to a predetermined pressure in said passage (35) to spill fuel therefrom to a low pressure return line (62).
Claim 7
Dependent Claim
25 words
An apparatus according to Claim 1 in which said plunger (20) has a reduced external diameter in a zone thereof adjacent said flow path (36).
References Cited (Backward Citations)
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