Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1994-01-21
1995-01-24
Cross, E. Rollins
Internal-combustion engines
Charge forming device
Fuel injection system
123617, 324174, F02M 4114
Patent
active
053834356
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a fuel injection pumping apparatus for supplying fuel to an internal combustion engine the apparatus being of the kind comprising a housing, a cam actuated pumping plunger slidable in a bore, means for distributing fuel discharged from the bore during successive inward movements of the plunger, to a plurality of outlet ports in turn, a plunger actuating mechanism comprising a first part which is mounted for rotation in the housing and which in use is driven in timed relationship with an associated engine to actuate the plunger, and a second part mounted in the housing and being angularly adjustable therein about the axis of rotation of the first part, to enable the timing of inward movement of the plunger to be varied and a transducer mounted on said second part and responsive to indicia on said first part.
An apparatus of the aforesaid kind is shown in GB-A-2086491 in which the first part carries cam followers located at the outer ends respectively of pumping plungers and the second part is a cam ring having cam lobes on its internal surface which are engaged by the cam followers. The transducer is carried by the cam ring and is of the variable reluctance type and is responsive to the passage of grooves which are formed in the surface of the first part. The transducer since it is mounted on the cam ring moves in the use of the apparatus about the axis of rotation of the first part as the timing of fuel delivery is adjusted. As a result it is necessary to provide a flexible connection to the transducer such a connection in practice extending between the transducer and a connector block mounted on the housing. The provision of the flexible connection presents practical difficulties and the object of the invention is to provide an apparatus of the kind specified in a simple and convenient form.
According to the invention in an apparatus of the kind specified the transducer comprises first and second pole components and a magnet acting to polarize said components to opposite magnetic polarity, the magnet and said components being mounted on said second part and forming a magnetic circuit with said first part, said first part and one of said components being shaped so that the flux flow in said magnetic circuit varies in a cyclic manner as the first part rotates in use, and a sensing coil mounted on the housing of the apparatus and surrounding a portion of the magnetic circuit to provide the output signal of the transducer.
An example of a fuel pumping apparatus in accordance with the invention
will now be described with reference to the accompanying drawings in which:
FIG. 1 is a diagrammatic sectional side elevation of a pumping apparatus generally of a known type,
FIG. 2 is an end view with parts removed, showing a modified transducer in accordance with the invention,
FIG. 3 is a perspective view with parts removed, showing the transducer of FIG. 2,
FIG. 4 shows a sectional side elevation of another example of the transducer,
FIG. 5 shows an exploded perspective view of the transducer of FIG. 4,
FIG. 6 shows in diagrammatic form a side elevation of a further example of the transducer, and
FIG. 7 shows a plan view of part of the transducer of FIG. 6.
Referring to FIG. 1 of the drawings the apparatus comprises a multi-part housing 10 in which is journalled a rotary cylindrical distributor member 11 which is coupled to so as to rotate with, a drive shaft 12 extending from the housing and arranged in use to be driven in timed relationship with the associated engine.
Formed in the distributor member is a transverse bore 13 in which is mounted a pair of pumping plungers 14. At their outer ends the plungers engage shoes 15 respectively which in turn carry rollers 16, the rollers and shoes constituting cam followers for engagement with the internal peripheral surface of a cam ring 17 mounted for angular adjustment within the housing.
Formed on the cam ring are a plurality of equi-angularly spaced cam lobes (not shown) and the cam followers are mounted in radially disposed slots which ar
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Cross E. Rollins
Lucas Industries
Moulis Thomas N.
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