ISO 7876-2:1991 燃料噴射装置 — 語彙 — Part 2: 燃料噴射装置 | ページ 11

9.1

fuel injector shank diameter

Diameter of the injector(2.2) which determines co-axial location in the engine.

9.2

fuel injector shank length

Distance from the primary sealing face(9.9) of the nozzle retaining nut(7.19) (with nozzle fitted) to a reference point on the nozzle holder(2.3) determined by the particular type of injector attachment.

9.3

pressure face

Faces on the nozzle body, nozzle holder body(7.6) and adaptor plate(7.7) where applicable which are held together in an assembled injector to form a fuel-tight seal.

9.4

back-leakage

leak-off

Fuel which leaks through the clearance between the needle and the nozzle body.

9.5

fuel injector (nozzle) opening pressure (nop)

Lowest hydraulic pressure (applied at a slowly increasing rate) at which flow through the injector(2.2) commences.

9.6

fuel injector (nozzle) working pressure

Stabilized nozzle opening pressure for the correct function of the injector(2.2) in the engine.

9.7

fuel injector (nozzle) setting pressure

Nozzle opening pressure at which an injector(2.2) is initially set to ensure the correct working pressure after stabilization.

9.8

fuel injector (nozzle) closing pressure

Highest hydraulic pressure at which the needle starts to close.

9.9

sealing face

Face upon which the injector(2.2) seats to make a gas tight seal with the engine. Commonly this face is on the nozzle retaining nut(7.19) .

9.10

differential angle

Difference between the angles of the mating conical sealing surfaces of the needle and nozzle body.

9.11

differential ratio

Ratio of the needle guide diameter to the needle seat diameter. This is expressed in terms of the diameter values in millimetres (eg. 6 x 3).

9.12

spray cone angle

Included angle of the cone embracing the axes of the injection/spray holes in a multihole nozzle. Particular nozzle designs may have more than one spray cone angle.

9.13

spray dispersai angle

Included angle of the cone of fuel leaving a pintleorpoppet nozzle (8.1 or 8.7), or a single injection/spray hole in a hole type nozzle(8.5) .

9.14

spray cone offset angle

spray inclination angle

Angle between the axis of the spray cone angle(9.12) and the axis of the nozzle(2.2) .

9.15

overlap

Length of the throttling (delay) portion of the pintle penetrating the orifice in a delay pintlenozzle(8.2) , measured closed.

9.16

nozzle sac

sac hole

Chamber within a hole-type nozzle(8.5) tip from which the fuel enters the injection/spray holes.

9.17

nozzle sac volume

Volume within a hole-type nozzle(8.5) tip between the needle and the entry to the injection/spray holes determined with the nozzle closed.

9.18

nozzle seat

Contact line/surface between the needle and body of a closed nozzle which prevents fuel flow to injection/spray holes.

9.19

fuel injector dead volume

High pressure volume contained inside an injector(2.2) between the needle when seated and the bottom of the cone of the inlet connection.