JPS5932625A - Fuel injection timing controller for internal-combustion engine - Google Patents

Abstract

PURPOSE:To prevent the timer property from being scattered, by a method wherein timing weights are maintained in a balanced pose in a low rotating speed range, and are shifted in a balanced manner. CONSTITUTION:The wide-opening displacements of the timing weights 15a, 15b to which the rotation of a driving flange 1 is transmitted are transmitted to large eccentric cams 10a, 10b through eccentric pins 14a, 14b, and are transmitted to small eccentric cames 12a, 12b rotatably supported in an eccentric manner by the cams 10a, 10b, the rotations of the small eccentric cams 12a, 12b are transmitted to a timer hub 2 connected to a driving shaft 3 of a fuel injection pump, and the flange 1 and the hub 2 are angularly displaced relatively to each other in accordance with the rotating speed. In said controller, a plate 20 capable of rotating relatively to the timer hub 2 is fitted to the hub 2, is provided with guide grooves 22a, 22b at symmetric positions with respect to the center of rotation, and pins 23a, 23b connected to the timing weights 15a, 15b are slidably fitted respectively into the guide grooves 22a, 22b.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device that automatically (two-adjusts) fuel injection timing according to the rotational speed of an engine.

In general, teasel engines, etc. (2) are controlled so that fuel injection is always performed at the highest pressure point (1), so that the fuel injection timing is advanced as the rotational speed increases (2). .

As a typical example of this glazed fuel injection timing adjustment device (referred to as an automatic timer), the rotation of the μ and V movement flanges connected to °C and engine 1-uf is transmitted to a pair of timing weights, and these timing weights are When displaced by the centrifugal force, this displacement is transmitted to the driven flange of the timer hub through the large eccentric cam and the small eccentric cam, and the timer hub has a biangular displacement of the driven flange (relative to the two) Jl. , the drive shaft of the fuel injection pump is advanced and rotated by 2, and the fuel injection timing is set relative (
231L angle (-) is known.

Such a centrifugal force (from 2 to 14) When using a timing weight that is displaced in the radial direction, a pair of supports t-1i' 111I+ is guided by these support rods, and a spring is attached to the support rods to generate an urging force for returning the timing weight.However, such h'
For C+ products, the centrifugal force of the timing weight is small at low speed rotation, the tension of the spring that suppresses this timing weight is also small, and in addition, the engine torque fluctuation is unstable, so machining is difficult. The influence of errors and assembly errors is large, and the timing weights tend to wobble, and the postures of both timing weights tend to tilt from their normal positions. When one timing weight tilts, the tension of the spring changes,
Therefore, the left and right timing weights are equal (-operation 1-difficult).

For this reason, for example, the Np-θ characteristic diagram of the timer shown in FIG.

θ is the timer advance angle), due to the characteristics required by humans in the low speed rotation range (2), variations such as B occur, resulting in the engine not being able to fully demonstrate its performance, or when restarting the engine after stopping. There are some problems with poor performance.

The present invention has been made based on the above circumstances, and it is possible to maintain the timing weights in an even posture even in the low rotation range (2), so that the timing weights are moved evenly, and to prevent variations in the timer rotation. It is an object of the present invention to provide a fuel injection timing adjustment device for an internal combustion engine that prevents the above occurrence.

That is, the present invention provides a timer hub or a casing with a play 1 that is rotatable relative to the timer hub, a guide groove located symmetrically with respect to the rotation center of the plate (two rotation centers), and a timing weight (two connected Slide the bottle freely to 11゛ (combined A)
It is characterized in that the plate f maintains the same posture of the left and right timing weights.

Hereinafter, a first winter embodiment of the present invention will be explained based on FIGS. 2-7 and 3.

In the figure, it is a moving engine, connected to the crank of the engine shown in the figure, and rotated in synchronization with the -C engine. 2 is a timer hub, which forms the camshaft of the fuel injection pump (not shown).
There is an old 'C. The hub 2 (2) is integrally provided with the small 11 flange 1 and the driven flange 5 facing the support 1. This driven flange + 1.
A C holding flange 7 is attached to 15 via bolts 6. The holding flange 7 holds the drive flange L2 in the axial direction by means of the stage H) 38 (the two are immovable, but are rotatable relative to the μ-section shaft flange. 7. Happe 2 has distance movement flange 1 (two pairs of 'C rotation' I functions).

The two positions are symmetrical to each other (two circular holes 9a
, 9 h is open'f, :J-Jilte'? Into these circular holes Q+l, 9bL2, disc-shaped large eccentric holes 10 lI, I Ob are fitted so as to be freely rotatable.

Large eccentricity 10a, 10b+2 are respectively (Ii;i
Small circular holes 11s and 3J are provided at the upper position, and inside these small circular holes 11a, l lh (2V and small eccentric cams 122° and 121); Sat
I'm there. Small center cam 12s, 12hl-1, eccentric 4
Second eccentric bottles 13 a , 13 b are press-fitted into the second eccentric bottles 13 a , 13 b .
13h is 1llI (moving flange 1) (21° freely rotatable (211 or 4 positions).

Eccentric bins 14X+, 14h with eccentric positions C2 chain 1 are protruded from the two-way large 1rli core cams Oa and lOh, and these first (1, ii core bins 14a).

The 14h timing weights 15X+ and 15h are press-fitted and connected.

The timing weight 15; +, J5b is divided into two in the radial direction, and is attached to the outer circumference of the timer hub 2 (two timing ways) 15a so as to surround the timer hub 2. , 15h is ga;1
When the mental power IZ is outwardly changed, they are mutually expanded. These timing weights are 1.5 a
, 111 rods 16.16 were passed through for 15 h. These rods 16° 16 (t, i) guide the movement of the timing weights 15a, 15b in the radial direction, and also serve as support for the return springs 17.The return springs 17... , each rod 16,
At step 16 (the bifurcated spring receiver 18... and the timing weights 15a, 15b are placed in a 1ffl position), one chair presses the timing weights 15a, 15h in the direction approaching the flexure. There is.

Timer hub 2 or 4? A plate 2θ is provided at the end opposite to the driven flage 5.

This plate 201-1. The circlip 21 prevents the timer hub 2 from being pulled out to the base of the month.
There are two pairs of timer hubs (7 and 111 times 111 and 21 times), and this button I/-20V'1.
The timing weight 15a is connected to the driven fludge 5.
, 15b are kept in a neutral position so that they can freely move in the radial direction, but this play 1□ 20 (- indicates the symmetrical position 11 with respect to the center of rotation) has the same groove 22a,
22b is formed. These medium grooves 22a.

22h are provided so as to be inclined to each other with respect to the radial direction.

These made grooves 22n, 2211f are respectively guide pins 23a, 2, ? b is a sliding automatic attack two kidnapping i people, and these tj dobin 23
a + 23 b + 4 each timing weight 1
5a and 15h are connected by being press-fitted at symmetrical positions.

The operation of the embodiment will be explained based on the following.

When the rotation of the engine is transmitted to the drive flange 1, the second
The small eccentric cams 12a, 12h, L and 3 cores are connected through the core pins 13a and 13b (17).
08, since lOb is rotated around the drive shaft 30, the timer knob 2 is rotated via the driven plunger 5. Therefore, the rotation of the engine is transmitted to the drive shaft 3 (2) and pulses the fuel injection pump.

As the drive flange 1 and the timer knob 1 rotate, the timing way 152 and 15h also increase. , l 5 h
The centrifugal force of the timing weights 15a and 15a increases.
・15 h fi return spring J7... expands and displaces against the snoring and sword. timing way) 15a
115 +1 movement in the outer diameter direction 11tlj ij: 3
ij, I eccentric bin + 4 a, 14 h via the dog i (i 1 center cam 1θa.

101) in the direction of arrow C in Figure 3. For large im lt center cam 10a, 10h circular hole 9a, arrow inside 9h.
) direction. Konojo Una Daibutsu) heart-warming 10*
, the rotation of 10h causes the small eccentric cams 12a, 12b to -1
- I try to rotate in the direction of the arrow J, but the small
1-core cam J o a , 1 o h iJ: 1st-core cam J o a , 1 o h iJ: Class 1 moving flange via the second eccentric bins 13 a , 13 h . ,
Rotatably take it to /1, 1 digit Z) to arrow E
Rotate in the direction. This results in a second eccentric bin l, ? a
.

J 3b is I? centered around Yu-r Mahab 2? +1 direction (rf'J) Therefore, the circumferential position of the driving fledge J with respect to the timer hub 2 changes,
The timer hub 2 is relative to the opposite (2 μ: ix IJ + flange 1).

As a result, the engine rotation speed Np (vs. fuel 1+)
It is possible to advance the K injection pump's sentry light.

However, the timing lab light 15a, which looks like a double series,
When moving 15b to expand, each way) 15 F+,
l , 5 b is noi id bin 2 , ? n, 231
+ is connected to plate 20 via jfμ,
The centrifugal strokes of both weights 15a and 15b are mutually controlled (C-regulated so that they hit evenly), that is,
For example, one timing weight 15a is significantly outside compared to the other way) 1.5 h-1', -r: 11
If you are trying to move in the 5th direction, the guide pin 232 connected to the timing weight 25al is also thicker (displaced in the 1st radial direction). One guide groove 2a formed in 20
Attempt to move from inside to outside in the 1-a direction. Guide groove 22a
Since the plate 2o is inclined in the radial direction C2 to 1, the plate 2o is rotated in the direction of the arrow F by the cam action (2 to 1) of the guide groove 22a.

When the plate 2Q is rotated in the direction of the arrow F, the guide groove 22h of the other plate I is also rotated H! 11), the Med f bin 2,7h protruding from the other timing weight 151)
to the outer diameter direction. In other words, the timing weight 151) on the other side is J5+1 on the other side.
Same as - Only the mobile device has to move 11, so both ways 15a and 15h make equal centrifugal displacements.

Note that when the engine is decelerated and the angle of attack is operated, the centrifugal strokes of the timing weights 15a and 15h are also matched.

According to this +111 formation, the timing weight is 15
Since the strokes a and 15b are maintained at equal strokes, variations in characteristics are eliminated, and the required characteristics shown in Fig. 1 are achieved with high accuracy.Especially in the low speed rotation region (-, timing way) 15a .

15hi: Even if the centrifugal force generated is small, the pressing force of the return plug 17 is small, and the engine torque fluctuation is unstable, both weights 15A, 1
5 b no shie! ζ゛(circle, callout [1-ri is even 1
- Since it is maintained, the characteristic pickpocketing is prevented by 1υi.

Note that the present invention (bow, upper fffLff side (- not limited to, and λ
4 and 5 (2) may be constructed from the example of 1!l\2 shown in Figs.
The 11th example is a slave 11ij plunge 5 and a timing weight 15a.

15h's 1st month C Niimushi play) 40 is placed in the timer hub 2 (2 rotatably L2), and the plate 40 is equipped with a timer hub 2,
4 J b f opened and 7 tera Z). and j′Il:
Radz J Iton, 1,741 R+411) has timing way l-15a.

1sb and large eccentric cam 10 a, l Oh] 1
The first eccentric pin 14a, 14h is connected to the first eccentric pin 11, and the first eccentric pin 14a, 14h is connected to the first 94th example. += 3.-
Hurupu J dobin, l! ,'? a, 2,?
7 using 111 h. , and the first eccentric bin 14
A, 14b has a slide groove 41m, sliding resistance with 41b] 1
7 if square (2 Z), and 7" 7 r7 n etc. sliding collar 42 n, 4211 II"j knee J).

If this x number of irises were 111 and 2, the older sister would have published 15 pages. 5゛j1 and 1i-11 have similar effects.

Furthermore, the present invention ff, :J: a+'t; This thing fJ:,! L.J.
] 1゛-Thing 6 ob closing: '+% Al'l 61
";z: G') I', II-j-, and using the oil seals 62, 62, the inner rrl! and timing sea urchin ito 15a.

151), the same as the second embodiment (A) (on plate 4).
θ, and H-id grooves 41a and 41h are provided in this plate 4o.
(only one is shown).

Ga J..., each plate 2θ14θ1r Yusunnut facing blade L
＾・Meng: Sudo) May serve both functions.

``Each play 1-20, 40i'', the timer hub is set to 1).
t p) Z], and in this case also play)
(・You can freely rotate C twice relative to j-x Imahab.

As mentioned above (in the Miki invention), the relative position (two rotatable butts) relative to the timer hub is set, and the center of rotation (2) is set with a symmetrical position f knee Jf groove. ) Slide the two connected pins into the f guide grooves respectively. Centrifugal stroke 1 cork by plate and posture BJ,
1. An even stroke was maintained. Ru.

However, this prevents variations in the strike 11-res between both units and r, and improves the e-7 characteristics (without causing fluctuations,
・There are 16 advantages in demonstrating the acquisition characteristics with f4i accuracy.

41shi1 side)nA fig s+i(a 1 to IJ21)
i, '21 is the number of rotations of the timer (pair of advance angles 'l<r
171g 'PC display-? Figure, m 2 i'! I b and rj! 3 +'; 21 +・Ma shows the first embodiment of the present invention, and FIG.
The figure is partially sectioned (++ll figure, plane 41p'<1 trigram, and Figure 5 shows the second example m'1 of the 71\ invention, and the fourth
Figure bald cross section t! +it, Fig. 5 is a cross section of -.
However, Fig. 6 is a diagram showing the third embodiment of the 7-tree invention to scale.

No...'AI< PIJJ Fran, 2...Evening...
f Mahab, ri... Mameryo lJ + flange, 10 a
, 10b - Large eccentric cam, 12a, 12h - Small eccentric cam, 13m, 13b... 2nd A (Cocentric bottle, 1
4m, 14b...first eccentric bin,) 58, 15b...
・・Timu Miite, 20, 40...Plate, 22R, 22b.

41n, 41h...Guide groove, 238.23b...
・Pufidobin.

Applicant's agent Patent attorney Suzue Takeshi Teeth 1 71::, -Fita at Nρ (rpm) Fang 2 figure JJr3 figure Sai 4 figure nA 5th figure +1'lA Figure 6 =128-

Claims (1)

[Claims] To the engine, l:stl:K! 1rJ + Jji
The rotation of the J's machine 11 plunge is transmitted to a pair of timing weights, and these timing weights are expanded and displaced in the radial direction by the biasing force of the spring (1 resistance l~) by centrifugal force, and the expansion displacement of these timing weights is 1st
1. Large eccentricity via the 4-core cam. When transmitted to J, 7 is also f2.
','(-) is transmitted to the small (rrr center cam), and the rotation of this small eccentric cam is transmitted to the fuel 111 by the second ifof center bottle.
(Informs the timer hub connected to the drive shaft of the injection pump, and the rotation speed of the timer hub at the 111i electric IJI flange is 1.1 [+1] relative (-) according to the relative (-) angle displacement of the fuel injection timing bar, (! In the adjustment device, the timer hub or casing (knee 1 - tie 1 - a plate that is rotatable relative to the hub)) 2. Forms a symmetrical position (Ni guide 7Nt) at 4'7 during rotation, and in these noid grooves, 1 timing weight (a series of connected bottles can be slid freely (21L). A fuel injection timing adjustment device for an internal combustion engine, characterized in that: