JPS6114421A - Diesel engine - Google Patents

Abstract

PURPOSE:To reduce an extent of noises and vibrations so sharply as well as to make advanced ignition come to fruition, by forming a fuel abiding part which makes a remaining part, after scattering a part of injection fuel, stick to an inner wall of a passage in which an auxiliary nozzle hole adjoins. CONSTITUTION:A passage 11 is formed in making it adjoin an auxiliary combustion chamber 2, and an injection nozzle 12 is installed in this passage 11. An auxiliary nozzle hole 10 to be opened after closing a main nozzle hole 18 in time of low load is made to adjoin an inner wall of the passage 11. On the inner wall of the passage, there is provided with a fuel abiding part 22 which scatters a part of fuel to be spouted out of the auxiliary nozzle hole 10 and makes a remaining part stick to the inner wall. The fuel spouted out of the auxiliary nozzle hole 10 is made efficiently stick to this fuel abiding part 22 whereby a liquid film is formed on the inner wall of a combustion chamber. Thus, a show-moving combustion is attainable and, what is more, an extent of noises and vibrations is sharply reducible, and advanced ignition is also attainable.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a diesel engine, and particularly to a diesel engine in which a sub-combustion chamber such as a swirl combustion chamber or a pre-combustion chamber is shifted to the right. The present invention relates to a diesel engine that can slow combustion during a low angle load of 6p, suppress the rate of pressure rise in the cylinder to a low level, and significantly reduce noise and vibration.

[Prior Art] FIG. 10 shows a diesel engine equipped with a whirlpool combustion chamber as an example of a sub-combustion chamber, and a whirlpool combustion chamber 2 is defined within a cylinder head 1. This combustion chamber 2 is communicated with a cylinder chamber 3 formed in a cylinder valve 1 (not shown), and generates a vortex S of compressed air flowing in due to the upward movement of the piston. In addition, in the combustion chamber 2,
A fuel injection nozzle 4 for injecting fuel F into the chamber is provided. The mixture vaporization of the fuel injected from the injection nozzle 4 is promoted by the vortex S, and is ignited and combusted by the heat of compression.

Tokoro (j゛Eel Engine ni Haruka Takumi 11. I!
If the interval between II and II is good, diesel knock (fuel 1 injected during the ignition delay period becomes a premixture, creating a high J energy state in the combustion chamber 2 and producing a large number of flame kernels at the same time). 9) to prevent combustion from proceeding all at once (explosively). Such rapid combustion increases the rate of pressure rise in the cylinder chamber ζ3 (prevents the generation of large pressure waves, which impact the screws, cylinder chamber, etc.) and generate noise and vibration. Especially when the engine is idling and the cooling water temperature is low immediately after the engine is started, the overall engine temperature is also low, so the ignitability of the fuel itself is poor and this tendency is noticeable, which is also favorable from a physical experience. It's not something.

In view of these circumstances, the applicant of the present application proposed the method 1-1 shown in Figure 11.
J-Una proposed a ``vortex chamber for diesel engines'' (Utility Model Application Publication No. 112432/1983). In this invention, the 10th
An injection with a single injection [=15] as shown in the figure
Instead of the injection nozzle 4, the combustion chamber 2 has an injection nozzle (so-called pin 1 ~Unozuru”
)8 is set (). Then, the sub-injection 1'7 faces the glow plug 9, injects the fuel F before the fuel is sent from the L injection port 6, and injects the fuel [2] into the glow plug 9.
The aim is to atomize the fuel at the point of impact and achieve early ignition.

[Problems to be Solved by the Invention] By the way, as in the above proposal, in order to prevent the generation of unburned fuel (reducing noise), the screen i 11i1 that is injected Qj+
By promoting atomization, vaporization, and mixture vaporization through vortex flow, the ignition delay period can be shortened, and the flammability can be improved during the 4th and 2nd combustion period, resulting in considerable improvements in noise performance, etc. It can be achieved. However, only the ignitability was pursued (J and the fuel that evaporated and premixed within the shortened ignition delay period)
*There is a concern that combustion may not be sufficiently suppressed and noise performance may deteriorate. .

[Object of the Invention] The present invention was devised in view of the above-mentioned problems, and an object of the present invention is to shorten the burnout period during low load such as idling. 1. To provide a diesel engine in which the injected fuel 1 is slowly vaporized and its combustion is slowed down to significantly reduce noise and vibration. 1. [Overview of the invention 1] In the invention, a passage is formed facing the sub-combustion chamber, and a sub-injection is formed on the inner wall of this passage with a low load @ the main port is closed in the shade and the sub-injection is opened. Part 7 of the fuel injected from the sub-nozzle is scattered (part ZI-(J'
Q' = A combustion eye 11 is formed to allow the fuel that has been avoided to be ignited early, and the fuel that has been ignited is provided for slow combustion. There are many things to summarize.

Embodiment I A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1, a vortex combustion chamber 2 is defined as a sub-combustion chamber within the cylinder head 1, and a vortex S of compressed air is generated in the combustion chamber 2.

A cylindrical body is provided on one side of the combustion chamber 2 so as to avoid being close to the ejection end 10a of the sub-nozzle 10, and faces into the combustion v2.
1'If 11 is formed. Inside this passage 11, a blower cap nozzle 12 is installed (pulled) to generate combustion 3'mi1 in the combustion chamber 2. The nozzle body 13 forming the outer shell is i+11.'l The cylinder 1 is connected to the passage 11, and the wood-like hole is heat-sealed to I/1. The shield 15 connects the nozzle body 13 to a sill head with a height of 6+1.
111 to prevent heat transfer.

A fuel supply hole 1G is formed inside the nozzle body 13, through which fuel is fed under pressure from a fuel) 81 cylinder.
The m hole 1G has a diameter of 8111 in order on the combustion chamber 2 side.
Through the one-piece valve seat surface 17, the fuel is %'t, up to 2)? 4' runs through the main 11Q port IB, which is formed in the injection valve. In addition, 1. J, E.I.
A sub-nozzle 10 having a relatively small diameter is formed radially outward of the nozzle body 13 by branching from the E nozzle 11ε3. This J,
(1) Inside the nozzle body 13 where the blade is colored i=t. a, supply ru 7t 'I 6 fil! l 7J) et al.-11
1 (I l'.l 1 B near'l -,) 7 1
1 valve l 9 KailQ tJRarel 1, Nagibu i'19+
．． L,: 1 in 2 [j18 opening and closing shaft (4
The first valve body 611 19a is provided with a body-shaped second valve body 191) for opening and closing the supply hole 10 (color, 19a, etc.). 4 ``A working animal (
, l, i I, follow the Rikunonk angle L) and 1-1 negative (L: j state (this 1, then go to the corresponding Reno 1 ttl
1] - to be reactivated) 7,1 is formed l'lru1
.

1st valve body part 10ε1('', required fuel or less 4 nails ↑l) f
'19's Reno 1- 77+ is small, that is, Tunoid Ring 11・1) ゝ) Ibai:+? ．． ij II,
￥Kasashicho L' 1B is maintained in a closed state and the skill is satisfied - <10l! ? 1 passed through ir+i to i port 18, on the other hand, 2nd block?
Body part 1 9 11 L; L, -1-To the valve seat surface 17 and around it? A was fired in a state where Route 1 was attacked, 1:1
Valve 19 (] always double-acting]), ) following and supplying) m hole 1G
7.

rVi l! rl ITI 'l O LJ: Sono person "] side is this 'E) valve): Ij. 1 7 To hook'1
2 valve body part 191) is formed between "-Of-" ( +
-11 8 closing port, "1 (fuel is supplied from the supply hole 16 when there is J33 and when idling etc. +1, Q01 fuel z) f?i is small. is this sub-injection]]10 (from θ to combustion 'A'il
IT/+ sword comes out 4 rows 4 J, sea urchin (1 "1 is completed.

In this way (111 created sub-injection I-1 1 0 +.

As shown in the figure, the eruption ('Fri 1 0 a
But this is the uphill 11th) body, I'ij 1=
A vortex Sf/) is generated in the combustion chamber 2 in the combustion chamber in the direction of the i4 flow (t'U flow along i\20, within the passage 11 formed in the vicinity of C: 1 in A♀21) ).・1
11, heard in d. [() Particularly in the present invention, the sub-nozzle 10 is
l l'fl L+ 1 0 Karall, (1 '+J
'e3 collides with fire, part of F's l-+
The collision caused the mixture to turn into a flame, and it flew directly into the combustion chamber 2;) The mixture was vaporized by the vortex S, and ignited!
Most of the fuel (remaining part)
i J-Uni 1・1t outrageous person zazete liquid 1]! ．． ! l-
In this state, the fuel flowing into the combustion chamber wall 20 suppresses vaporization and mixture vaporization due to the vortex S (j fuel; fi! retention part 22 is formed. That is, l! + thrust into the passage ¥1! 2 't) A part of the fuel 131 that ages and scatters and becomes a mixture vaporized by the vortex S [
In addition to achieving early ignition at -1,? The fuel flowing in the form of a liquid film on the combustion chamber wall 20 (11)
It is slowed down by Fuel specifically? 11) Clasp 2
2, an uneven cat is engraved on the inner wall 21 of the passage (1-19).
formed, and the injection fuel F from [110] is efficiently <1
''A part of the combustion chamber A8 is scattered from the passage 11 to the combustion chamber 2 side.''

21st Sea 1 - Figure 7 shows the burning 1d1) station fMI 2
A concrete example of RFFJ is shown in the history of 2. 1. The one shown in Figure 2 has 21 f^
It is a J-direction (, "ζ (〉) with multiple unevenness arranged and i!/+ formed in steps in the axial direction of the passage 11"), and the addition property is ?111 points or 1)- ] Square thread-shaped screw threads are arranged in a spiral.

:'A The item shown in Figure 3 is a trapezoidal screw thread formed by adding a trapezoidal screw thread to the horizontal screw thread shown in Figure 2. - There is C of 'tJ'. This ♂) is +1 tJ-
I am an excellent person.

The rim shown in FIGS. 11 and 5 has a plurality of unevenness along the axial direction of the passage 11, and forms a vortex in multiple stages around the inner wall 21 of the passage, i.=-b, so-called. In this embodiment, the grooves can be formed deeply, so that the adhesion of fuel 1'i1 can be trapped and the formation of premixture can be suppressed, thereby improving noise performance.

In the case shown in FIG. 6, holes 23 are bored radially outward from the inner wall 21 of the cylindrical passage in a ratio of 1:9, and these holes 2
3 to form uneven grooves. Such a fuel retention section 22 is formed by a sleeve 24 having a hole 23 formed therein.
A sleeve 24 is separately manufactured and installed inside the passage 11.
CJM completed - (' t) good.

The item shown in Fig. 7 is a cylindrical porous material 25 inside the passage 11.
For example, a ceramic moon or the like is installed inside to form uneven grooves.

Ceramic materials have excellent heat resistance and are suitable for use in the fuel retention section 22. This embodiment does not require groove molding, so productivity is good, and substantially the same performance can be achieved in any of the embodiments.

On the other hand, the ejection end 10a of the auxiliary nozzle 10 is formed to have a small diameter, so that the particle size of the ejected fuel is reduced so that a liquid film [-] is easily evaporated. That is, by converting the fuel into a liquid film and flowing the liquid film to the downstream side of the vortex S, it is possible to suppress the vaporization and mixture vaporization of the fuel 1, but the evaporation of the fuel 1 is significant. If it is damaged, it will be discharged as unburned matter after combustion, so liquid It! '! By making L thinner and making the particle size finer (covering), it compensates for the vaporization of the fuel, and by maintaining a balance between these, slow combustion is achieved while suppressing the deterioration of 1-1C, etc.

As shown in Figure 1, 26 is a glow plug that improves engine startability by 4'', 3 is a second glow plug, and is generally a glow plug II.
rI used to burn 1 to collide! Burn as much as possible
Although it extends deeply into the inner pipe i'2, in this embodiment, it is installed along the combustion chamber inner wall 20 in the downstream direction of the vortex S to avoid contact with the liquid film. With this configuration, the glow plug 26 is not exposed to high pressure and high heat during normal operation after startup, and the air resistance of the glow plug 26 can be increased by 1 μm.

Next, we will discuss the effect.

As shown in FIG. 1, when idling or under low load, the needle valve 19 reciprocates and the second valve body portions 1 to 9b
is burned by opening and closing the fuel supply hole 16.
The valve body portion 19a holds the main nozzle 18 in the closed state, and the stone is injected only from the sub-nozzle 10.

1) The injected fuel is n, n f:ji, and the fuel 11) hits the inner wall 21 of the passage 21, hits the reservoir 22, and is partially atomized and atomized into the combustion chamber. Most of the fuel [= is the predetermined angle 11 situation - (
Formation of a wide thin liquid film 1- on the inner wall 20
l"ru 1, this and 1; Bushi, mo A"El i (! Tomebe 2
2 effectively retains the ejected fuel due to its uneven shape and flows to the combustion chamber wall 20 in the passage 11, and a part of the fuel 1 is combusted. It is scattered to the chamber 2 side.Most of the fuel 1.il F flowing to the inner wall 20 is located on the downstream side of the vortex S, that is, in the same direction as the flow direction of the vortex S. !!＜II
S! It is possible to suppress as much as possible the separation of L from the combustion chamber inner wall 20 due to the vortex flow S of high-humidity compressed air. However, the swell does not prevent the vaporization and mixture vaporization of the combustion gas '3[11-] at all, and because the diameter of the sub-nozzle 10 is small, the particle size itself is relatively small, and it flows over a wide area in the form of an a9 film. J, the liquid film is also in a state where it is easy to release fish. Therefore, as mentioned above, the ignition point Δ occurs early due to the air-fuel mixture of the fuel F1 partially scattered in the combustion chamber 2, and as combustion begins, the fuel power increases to 1.
-The fuel that vaporizes sequentially from M ii < 20 is combusted, and a slow 4-I combustion process is followed. Let's accept the result shown in Figure 8 (conventional ignition delay) -2 to 1'
The entire cylinder chamber was in a high-11 fuel condition and combustion was progressing aggressively. is the fuel Fl 8i on the inner wall 21 of the passage! Stop part 22 (Te-self-ignition-(Scattered part of the fuel F h J, Riu 1 fire bamboo 1./'c
, while achieving early 1yj ignition (11 (small) in the figure),
Most of the fuel is liquid II! ,! L-dishuku combustion chamber wall 20
It was made to gradually vaporize from lr - u fi'i (as shown by the solid line Δ, the average effective 11-4 μ in the cylinder decreases t< cylinder/l”J
It is possible to suppress the pressure inside the cylinder to a low level, and it is possible to significantly reduce weak sounds and vibrations. In the figure, 1] is 7
10 p.
There is an opening period.

Figure 9 shows one of the most common problems for each engine cooling water shortage.
Ill + constant results are shown. In the figure, × and ○ are shown in Figure 10, respectively.
The measured values of the present invention are 1, 1, 2, 3, and 3, and the performance of the ζ layer 8 is superior to that of the conventional example. -(δ is a slip of the tongue).

In addition, the fuel flowing into the combustion chamber for ¥20 (3L+1!
! ■akBI T5'l TEH''), HC etc. (1
) rtM conversion'b Jnl system tesal 1, C is from normal operation to high load operation, the main nozzle 18 is closed by the chute valve 19.
is opened and the mixture vaporization by the vortex S is promoted (
・'Combustion takes place. At this time, part of the fuel from sub-nozzle b 10 is supplied to Is it more noisy than turning it into an air-fuel mixture?

Furthermore, in the present invention, A-C is nfl'c in combustion 3 de 2.
,l! /, 1: When the inner wall 21 of the passage approaches the ejection end 10a and collides with it, it prevents the fuel from being caught in the vortex S and causes rapid combustion from this side. You can prevent this from happening.

In addition, the present invention can be used for JS 1117'+ 1.1
・J nozzle 92 performs a preliminary injection before injecting the main fuel L1 or 1 in order to make the ignition 14 match.
l' 11 Binto Nozzle "Doki" 1 is similar, but its action and effect are different from 7J Rura's (・3, Bin 1~
1. The nozzle directs its sentinel 1 to the upstream side of the vortex, and pre-burns 1 before spraying from 1.
IL Part 7 [Promote aikiization and improve 6 fire-1-ε\
μB) The sub-nozzle 10 of the nozzle 12 adopted in the present invention is used for the injection of the engine t11 during the eye I-ring. , [One vortex S's d111 combustion 1- is formed on the inner wall 20 of the dry flow 11tl+ of the fuel r+l which suppresses the vaporization of the C mixture.

In addition, in [Execution 19] above (Ma 11ft ITI
One 10 is formed and iJ shi (: two ii-C is explained, but it is also possible to form a plurality of -6s.

The fuel storage section 22 is also not limited to the above embodiment, but can easily accommodate a fuel ftl pipe.
1. In the above embodiment, ' is the auxiliary combustion chamber and no (vortex combustion chamber')
Although this has been explained by way of example, it can also be applied to a diesel engine equipped with a pre-combustion chamber.

]Effect of Light 1 In short, according to the present invention, the following excellent effects can be obtained from light (1)1.

(1) Idle link lK effect low f] Fuel I when loading, etc.
TrI-like Qru<;;p iJ sub-injection ['', burn □
Facing the grilling chamber/[The grill formed on the inner wall of the passageway]
11Y (Facing γHH l-1 This fuel device 1 I (part Kl !:l'J fuel is applied A... - Good<f
NJ A'': Use J to prevent the formation of liquid 1 in the combustion chamber. This will suppress vaporization and a vaporization.]
In this state, it is possible to achieve slow 1 (2) heating and significantly reduce noise and vibration.
'J l! A part of the fuel that is injected from the ri inlet into the passage and collides with the combustion part of V is ignited (C', !7j, jjll i-7 to obtain the necessary premixture)
It is possible to create soil.

(3) Simple structure and easy adoption - (Pasaru 1゜

[Brief explanation of drawings]

Figure '1 shows a preferred embodiment of the invention.
Fig. 2 is a side sectional view showing a specific embodiment of the fuel retention section, Fig. 3 is a side sectional view showing another specific embodiment, and Fig. 4 is a side sectional view showing another specific embodiment. FIG. 5 is a side sectional view showing a specific embodiment, FIG. Further, another specific embodiment is shown in side sectional view, Figures 3 and 3 are graphs comparing the present invention and the conventional example, which 9&i-yaki professional wrestling. Figure 9 is a side sectional view of the present invention and the conventional example. 7.1] Show the measured value of (1) Epuru Q sound for the water temperature.
The figure and Fig. 11 show a conventional example. ;t!j
2'1 is its inner wall, '12 is the jet Q'l nozzle, 18
is the main nozzle and 22 is the fuel? At the 111th station, β. l'l if'l Applicant: Isuzu Automatic Chuo Co., Ltd., Immediate Attorney]] Nobuo Kinutani Figure 3 Figure 5 Figure 7 Figure 8! 1 ” - Taku Frank Kaichu Rokunanto yo Figure 9 Enreno] Keirin On (0C) r'-, -; i>1. and +'17j,■,':,,”V
', -: ()'j'A>R-t R1<) C) Ir1
0 Month/Ir'1j11, Government Shir'1 Gakuden 11'1's 1゛31rii4 !IH! 59
-133 (-) y393 ′, - Nie Ming name
j゛Easel (Anama i7: t-,', -・j-te]-1 Relationship with li1'l 1￥ i+'11゛Jzukeq人(
017) u) 71・Automatic 4 ((, ceremony company: jj1
Person Postal I15 No. 105j Junior High School 1)'! Miyako Port [nuai'iU 1 T [”l 6 j
* 7 g Atago 111 bu 1 To Takeju Building 1] 11 Plan 7. ) tlf-=J If! f'fli 59i LOJ'J 2511 (
Light jsu ``1)・+, l1()+bl≦1! Drawing II Indoor bath separate IJ (6-Specially appropriate I) ``Submit the drawing, <,.,(
(r3 b, change the contents) ;゛-'田, 4 ・

Claims (8)

[Claims] (1) A passage is formed facing the sub-combustion chamber, and an injection nozzle having a main injection port for injecting fuel into the sub-combustion chamber is provided in the passage, and the injection nozzle is branched from the main injection port and has a low injection nozzle. A sub-nozzle that is opened by closing the main nozzle when under load is provided facing the inner wall of the passage, and a part of the injected fuel is scattered and the remainder is attached to the inner wall of the passage that the sub-nozzle faces. A diesel engine characterized in that a fuel retention part is formed to cause the fuel to stagnate. (2) The diesel engine according to claim 1, wherein the fuel retention portion is constituted by uneven grooves formed in the inner wall. (3) The diesel engine according to claim 2, wherein a plurality of the uneven grooves are arranged along the circumferential direction of the passage, and are formed in multiple stages in the axial direction of the passage. (4) The uneven groove is arranged in a spiral along the circumferential direction of the passage, and is formed in multiple stages in the axial direction of the passage. diesel engine. (5) The diesel engine according to claim 2, wherein a plurality of the uneven grooves are arranged along the axial direction of the passage, and are formed in multiple stages in the circumferential direction of the passage. (6) The diesel engine according to claim 2, wherein the uneven groove is formed by a plurality of holes bored radially outward in the passage. (7) The uneven groove is formed by a cylindrical porous material disposed inside the passage.
Diesel engine as described in section. (8) The diesel engine according to claim 7, wherein the porous material is molded from a ceramic material.