JPS5827872A - Fuel apparatus for compression igniting type engine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuel system for a compression direct-fired engine that includes a reciprocating plunger type fuel injection pump having an outlet and a fuel injection nozzle having an inlet connected to the outlet.

Conventionally, the injection bong is connected to the injection nozzle by the mother Eve! Bonfyl attached to the engine structure in a position where it can be driven by the engine? This injection pump is installed within the site. In an attempt to reduce the injection time, that is, the period during which fuel is supplied to the engine's fuel chamber in consideration of the rotation angle of the engine's crankshaft, it has been proposed to integrate the injection nozzle into the pump. In this case, the pump is driven by a cam mounted on the camshaft of the engine via a suitable rocking lever. In known devices,
The axis of the injection nozzle is aligned with the axis of the pump granger. The nozzle body extends into the combustion chamber of the engine and typically includes a step that flanges into a step in a bore formed to receive the injection nozzle.

If the engine is large, the cylinder head of the engine, especially the part forming one combustion chamber, is provided with passages, such as air inlet passages, exhaust passages, coolant passages and holes provided in valve stems. , it is possible to ensure that said step is provided with a suitable support so as to be able to absorb the iodine loads and the mechanical loads placed on the pump by the cam during fueling. In the case of high-speed small engines, the dimensions of the injection nozzle cannot be reduced, so the problem of providing suitable support becomes even more important.

SUMMARY OF THE INVENTION An object of the present invention is to provide a simple and convenient fuel system for a compression direct-fired engine that overcomes the above-mentioned problems.

The compression direct-fire engine fuel system according to the present invention includes a cylinder installed on the cylinder head of an engine, a mounting part integrally formed with the cylinder head, and a hole in the cylinder head carried by the mounting part. a fuel injection nozzle extending into the combustion space of the engine through the injection pump; a surface on the cylinder head that engages a surface of the cylinder head and has a complementary shape thereto for transmitting at least a portion of the force acting on the cylinder head during operation; It consists of

In FIG. 1, 10 is an engine (compression ignition type engine), and a cylinder w41 is gel-fixed to an engine block 12.
A cylinder 13 in which a piston 14 is inserted is provided in a cylinder 12. Particularly in this case, a recess is formed in the male stone 14 and this
It has become. A pair of passages (one of which is indicated at 16) is formed within the cylinder WX11, each of which supplies firing air to the combustion space.
Exhaust gas is exhausted from the combustion space (combustion chamber). The opening of / - is in the wall of the cylinder block that constitutes the earthen wall of the combustion chamber 15 . Poit valves (one of which is indicated at 17) are operated by cams 18k formed on a camshaft 18 supported by the cylinder head 11 to control the flow of gas through said passage 16.

The fuel system includes a fuel injection pump 19 and a fuel injection nozzle 20.
It is a combination of The fuel injection nozzle 20 has a tip extending through the wall of the cylinder head 11 in which an outlet orifice is formed to direct the fuel towards the combustion chamber 15 .

The fuel injection nozzle 2° of the fuel injection nozzle 2° is fixed, but the plunger 20m is partially protruded from the plunger 19k.

A swing lever 21 operated by a cam 18A on the camshaft 18 is engaged with the granger 20k. The axis of motion of plunger Z17A coincides with the axis of fuel injection nozzle 20. The injection nozzle 20 is of a stepped type, and the hole of the cylinder 1I111 through which the fuel injection nozzle 2° extends has a clamp (not shown) between this Omukai step and the step of the fuel injection nozzle 2o. ) K has a complementary shape to the fuel injection nozzle 2o so as to be gas-tightly sealed. The step of this hole must be able to withstand the axial clamping applied to the granger 201K during the clamping load and fuel supply, the cylinder! 1111, in addition to the passage 16, a cooling passage is also provided. Furthermore, since the fuel injection nozzle 20 is located approximately in the middle of the injection valve 11, the cylinder 'flll is relatively weak in this vicinity. It is possible to provide a step with sufficient support to withstand the axial clamp loads and grangers applied in large engines. However, in the case of small-sized engines, it has conventionally been difficult to provide support for the stepped portions, and the present invention was made to solve this problem.

FIG. 2 shows an embodiment of the present invention, in which the same numbers as those in FIG. 1 are given to the same parts of the fuel pump 19. A lateral protrusion 22 is formed on the day 19k, and a fuel injection nozzle 20 is provided in this protrusion 22. The axes of the sylanger 2/OA and the nozzle 20 are inclined to each other. The I-day J9A of the fuel cylinder f19 is formed with a surface 23 having a complementary shape that engages with a surface 24 formed in the cylinder head 11 at a position opposite to the passage 16. The surface 24 of the cylinder head 11 absorbs the thrust applied by the plunger 20k by the cam 18A. Further, a flanging force also acts on this surface 24, but this clamping force is due to the fact that the sealing method between the fuel injection nozzle 20 and the hole in which it is located is different from the known sealing method. , has a small value. Compression rings, which are formed in the hole of the fuel injection nozzle and which engages with the inner wall of the hole in which the fuel injection nozzle is installed to provide a gas seal, are no longer used.

Using this structure, the swinging lever 21 can be omitted since, in this particular embodiment, the axis of motion of the plunger 20 intersects the axis of rotation of the cam 18A. If the axes are made perpendicular, the two axes no longer intersect. For this purpose, it would be necessary to provide a rocking lever 21 or a separate camshaft.

In the embodiment of FIG. 3, cylinder $11 is provided with a stepped bore 25 extending toward the combustion chamber of the engine. An engagement wz6 is formed on the cylinder head 11, and a retaining surface 27k of the pump de-de-21 having a complementary shape to this is formed.
are in contact with each other. A protrusion 28 is formed on the inlet body 21, and a fuel injection nozzle z9 is fixed to the protrusion 28 with a known cap nut 30.

The protruding portion 28 to which the pump L day 21 and the cap nut 30 are attached is manufactured to dimensions such that there is a slight gap between the gear, the beech, and the hole 25 and the stepped portion of the hole 25. A corrugated washer is used to seal between the port 30 and the hole 250. The axis (motion axis) of the fuel injection nozzle z9 has a shape complementary to the engagement surface 26. The plane zrhK of day 27 is perpendicular. Denzo was on Day 27.
It has a built-in reciprocating plunger ring 31. The roller 32 forming a part of the blowfish 3 is operated by a cam provided on a camshaft (not shown) having a rotating shaft 33.

The axis of the pump 31 is shifted from the axis of the fuel injection nozzle 29 by $P9, and the cylinder head 11 holds the data 27 in a fixed position. The retaining surface 26 is formed at a distance from the step of the stepped hole 25 and has sufficient strength to withstand pumping forces. However, the line of action of the cam is the retaining surface 26
It forms an angle. As a result, there is a force acting in a direction parallel to the retaining surface z6, and in order to absorb this force, the bong 7° extends from the date 21 into a recess J4A having a complementary shape in the cylinder head 11. (or pin-like member) (dow@l) J a is provided. This da? 34 and the recess 34m form cylindrical surfaces 34B and 34C, respectively, which absorb forces parallel to the retaining surface 26.

This cylinder 34 is preferably of a cylindrical shape, which is perpendicular to the mounting surface 26 and installed parallel to the axis of the fuel injection nozzle 29. Also, a part of the cylinder head 11 is attached to the axis of the f-pump 31. A matching support (5 trut) 35 may also be provided. In this way, the forces generated by the action of the cam are applied to the cylinder head 11 at a location remote from the cylinder.

In FIG. 3, 36 is a control valve that controls the amount of fuel supplied to the engine by the pump.

A hole 36A forming a fuel passage is formed in the support portion 35,
In addition, it is convenient to provide a fuel flow path for the control valve 36 in the dar-N34.

FIG. 4 shows in detail the various fuel passages within the pump chamber 27 and also shows a variation of FIG. 3. In this variant, there is no dove 34, and instead of this, the bong f
A cylindrical protrusion 37 is formed in the cylinder head 11 and the protrusion 37 is formed in the cylinder head 11.
A cylindrical hole 38 having a complementary shape is provided with a 9-strip fit. The protrusion 37 and the cylindrical hole 38 define cylindrical surfaces 3'lk and 38k for absorbing the force resulting from the 477 action. A support portion 35 is formed in the cylinder head 1, and the inner wall of the support portion 35 supports a protrusion 37 that receives a lateral load generated by the action of a cam on the row 232.

Kya, 7″ nut 30 and stepped hole 2 where this is inserted
A sealing ring 39 is provided to seal the gap between the 5 and 5. The gap between the protrusion 31 and the sealing ring 39 is supplied with fuel through a port 40 to fill the cylinder. Hoai face 26 and Bon f? A further sealing ring 41 is provided between the faces 21 of the days 27.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a known fuel system for an internal combustion engine, and FIGS. 2 to 4 are longitudinal sectional views of embodiments of the present invention. DESCRIPTION OF SYMBOLS 10... Engine, 11... Cylinder head, 13... Cylinder, 14... Piston, 15... Combustion chamber, 16
...Passage, 17...Id, valve, 18...Camshaft, 181...Cam, 19...Fuel pump, 19A...
・Deday, 20...Fuel injection nozzle, 2. OA...
Plunger, 21... Rocking lever, 22... Protrusion, 23... Surface, 24... Surface, 25... Stepped hole, 2
6...Mounting surface, 27...Pump is connected, 27A...
- Surface, 28... Protrusion, 29... Fuel injection nozzle,
30...kiya, beech, to, 32...roller, 33.
...Rotating shaft, 34...No good, J4A...Concavity, 34
B, 34C...Cylindrical surface, 37...Protrusion, J7A・
...Cylindrical surface, 38...Cylindrical hole, 38A...Cylindrical surface.

Claims (6)

[Claims] (1) A fuel injection device that is carried by a mounting portion of a cylinder installed on the cylinder head of the engine, a mounting portion formed integrally with the body, and extending into the combustion space of the engine through a hole in the cylinder head. an injection nozzle, an injection nozzle having a reciprocating grunger disposed in the nozzle so that the line of action is offset from the axis of the fuel injection nozzle, and a force acting on the nozzle during operation of the injection nozzle; a first surface of the cylinder head for transmitting at least a portion of the ignition to the cylinder head, and a second surface of the cylinder head having a brocade shape; Fuel system for type engines. (2) The second surface is provided at a substantially right angle to the line of action of the plunger.
) A compression ignition engine fuel system as described in item 1. (3) A fuel system for a compression ignition engine as set forth in claim (2), wherein the cylinder head includes mounting means for mounting the cylinder head on the cylinder head. (4) A mounting part installed on the cylinder head of the engine, and a mounting part formed integrally with the cylinder, and a fuel carried by the mounting part and extending into the combustion space of the engine through a hole in the cylinder head. an injection nozzle, an injection meso having a reciprocating plunger disposed in the cylinder such that the line of action is offset from the axis of the fuel injection nozzle;
a first surface on said cylinder head, said cylinder head having a first surface engaging said cylinder head and having a shape complementary thereto for transmitting at least a portion of the force acting on said cylinder head to said cylinder head during said cylinder head actuation; and a fourth surface provided on the body such that it engages the first surface and a third surface of the cylinder head and extends substantially perpendicularly to the axis of the fuel injection nozzle. . A fuel system for a compression ignition engine, wherein the second surface is substantially perpendicular to the fourth surface. (5) The fuel device for a compression direct-fired engine according to claim (4), wherein the second surface is formed by a cylindrical protrusion provided on the meso. (6) The fuel device for a compression direct-fired engine according to claim (4), wherein the second surface is formed by a goo provided on the second surface.