Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
132 words
A fuel injection pump comprising: a plunger barrel 7 having a fuel pressure chamber 8; a plunger 2 that reciprocates up and down inside
said plunger barrel 7, pulling fuel into said fuel pressure
chamber 8 from a fuel collection chamber 6 via a fuel intake-discharge
port 12, and sending this fuel along under pressure; a freely sliding control sleeve 3 that fits over
said plunger 2; and a cam 4 that drives said plunger 2; fashioned so that the pre-stroke is regulated by
changing the relative positions of said control sleeve 3 and
said plunger 2 in the axial dimension; said cam 4 comprising: a main cam nose 20 for the
main injection; and a pre cam nose 21 for pre-injection positioned
roughly 180 degrees before said main cam nose 20.
Claim 2
Dependent Claim
56 words
The fuel injection pump according to Claim 1,
wherein said main injection is performed in the vicinity of
top dead center in the compression stroke of the engine, and
said pre-injection is such that a small quantity of fuel is
preliminarily injected in the vicinity of top dead center in
the exhaust stroke of the engine.
Claim 3
Dependent Claim
40 words
The fuel injection pump according to Claim 1,
wherein said cam 4 is provided in a camshaft 9 that is driven
by the engine so as to turn, and said plunger 2 is made to
reciprocate by said cam 4.
Claim 4
Dependent Claim
34 words
The fuel injection pump according to Claim 1,
wherein both the volume injected by said pre-injection and the
timing thereof relative to said main injection are made
variable by the regulation of said pre-stroke.
Claim 5
Dependent Claim
65 words
The fuel injection pump according to Claim 1,
wherein said plunger 2 comprises: a center communicating hole
13 formed in the direction of the center axis so that said
fuel intake-discharge hole 12 and said fuel compression
chamber 8 communicate; an inclined control channel 14 formed
in the outer surface thereof; and a vertical communicating
channel 15 that communicates with said inclined control
channel 14.
Claim 6
Dependent Claim
61 words
The fuel injection pump according to Claim 1,
wherein a main-injection cut-off port 18 and a pilot-injection
cut-off port 19 are formed in said control sleeve 3, and an
inclined control channel 14 and a pilot spill slit 16
corresponding thereto are formed in said plunger 2, whereby,
together with said main injection, a pilot injection is
performed immediately prior thereto.
Claim 7
Dependent Claim
23 words
The fuel injection pump according to Claim 6,
wherein said pre-injection injects fuel corresponding to the
pilot stroke PS in said pilot injection.
Claim 8
Dependent Claim
45 words
The fuel injection pump according to Claim 6,
wherein the stroke S1 from the cam-lift reference point of
said cam 4 to the pilot stroke PS of said pilot injection is
made variable, varying said pre-stroke by moving said control
sleeve 3 up or down.
Claim 9
Dependent Claim
49 words
The fuel injection pump according to Claim 6,
wherein the stroke S2 corresponding to the interval between
the pilot stroke PS of said pilot injection and the main
stroke MS of said main injection is made variable, varying
said pre-stroke by moving said control sleeve 3 up or down.