JPH0746744Y2 - Fuel injection amount adjusting device for multi-cylinder internal combustion engine - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention provides a unit injector type fuel injection valve for each cylinder with a fuel injection amount control lever, and all control levers are simultaneously rotated by one control rod. The present invention relates to a fuel injection amount adjusting device for a multi-cylinder internal combustion engine.

(Prior Art and Problems Thereof) In this type of multi-cylinder internal combustion engine, it is necessary to adjust the position of each adjuster pin that engages with the control lever in order to reduce variations in fuel injection amount between cylinders. As a conventional adjusting device, a long hole in the rod length direction is simply formed in an adjuster equipped with an adjuster pin, and the position of the adjuster in the rod length direction is adjusted by pushing and moving the adjuster by hand. ing. However, such adjustment means makes fine adjustment impossible.

However, in today's demand for more cylinders by reducing horsepower per cylinder and improvement of low rotation performance, accurate minute injection of each cylinder at the time of idling is indispensable. That is, in a small amount injection range such as at the time of idling, the non-uniformity of the injection amount between the cylinders causes combustion performance, low speed performance,
Since the speed control performance is remarkably adversely affected, it is required to surely eliminate such nonuniformity.

For the request of the injection amount fine adjustment function, for example, Japanese Patent Laid-Open No. 61-
We are developing a model such as 190128 that allows fine adjustment using a turnbuckle method. That is, an adjuster bolt for fine adjustment is arranged in the rod length direction, and an adjusting fixing piece different from the adjuster is provided at the tip thereof. As a result, the fine adjustment function is achieved to some extent. However, since the mounting space of the adjusting device is long in the rod length direction, it may be difficult to mount the space in an engine having a short cylinder pitch. In addition, the weight of the sliding part of the governor system increases, and the increase of the inertial mass affects the governor response.

(Object of the Invention) The object of the present invention is (1) to enable simple and accurate fine adjustment of the injection amount, and (2) to make the injection amount adjusting device itself lightweight and compact, thereby providing a small amount of injection. It is to improve the responsiveness of the governor such as time.

(Means for Achieving the Purpose) In order to achieve the above-mentioned object, the present invention provides each adjuster with
A fixing long hole along the rod length direction and a cam long hole intersecting the rod length direction are formed, and mounting bolts can be inserted into the fixing long hole to move the adjuster to the control rod in the rod length direction. The cam is rotatably inserted into the long hole for the cam, and the adjuster is movable in the rod length direction by the rotation of the cam.

(Embodiment) FIG. 4 shows a speed control device for an inboard-outboard motor equipped with a fuel injection amount adjusting device according to the present invention. In FIG. 4, the governor weight 1 is connected to a support 3 via a pin 2. It is movably supported, and the support 3 is a vertical governor drive shaft 5
The drive shaft 5 is rotatably supported by the mount 6 via a bearing (not shown). A timing belt pulley 7 is fixed to the upper end of the drive shaft 5, and the pulley 7 is interlockingly connected to a crankshaft pulley via a timing belt 8. The lower end of the drive shaft 5 has a spindle
10 is integrally formed, and a governor sleeve 11 is fitted on the spindle 10 so as to be vertically movable. The governor sleeve 11 includes a governor first lever 12 and a governor second lever 1
3, interlockingly connected to the control rod 17 via the connecting link 15 and the third governor lever 16. The first lever 12 is rotatably supported by a horizontal pin (not shown) parallel to the paper surface of FIG. 4, and the upper end of the first lever 12 is in contact with the lower end surface of the sleeve 11. The second lever 13 is an arm
It is rotatably supported by the regulator shaft 19 via 18, the upper surface of one end of which abuts the lower end surface of the first lever 12, and the other end of which is pivotally connected to one end of the connecting link 15. There is. The third lever 16 is rotatably supported by the pin 20, and one end of the third lever 16 is pivotally connected to the other end of the link 15. An engaging groove 21 is formed at the other end of the third lever 16, and the engaging groove 21 is used for increasing / decreasing the fuel injection amount.
The control rod 17 is moved in the up-down direction (rod length direction) by being engaged with the engagement pin 22 of FIG.

The control rod 17 is formed in a circular cross section and arranged vertically, and is inserted into two boss portions 23 at the upper and lower portions of the engine wall 4 so as to be vertically movable. An upper end portion of the rod 17 projects upward from the upper boss portion 23, and a spring receiver 25 is provided on an upper end edge of the rod 17. Reference numeral 26 is a start spring, which fulfills the functions of increasing the amount of fuel and removing play at the time of starting.

The rod 17 is provided with an adjuster 31 for each cylinder at intervals in the vertical direction, and each adjuster 31 is provided with an adjuster pin 27 that is perpendicular to the rod length direction.

In FIG. 6, which is a sectional view taken along the line VI-VI of FIG. 4, each unit injector type fuel injection valve 28 integrally provided with an injection valve mechanism and an injection pump mechanism is provided with a control lever 30. The rotation of the lever 30 increases or decreases the fuel injection amount. The forked tip 30a of each control lever 30 engages with each adjuster pin 27, and the vertical movement of the control rod 17 causes each control lever 30 to rotate simultaneously by the same amount.

As an adjusting device for finely adjusting the position of each adjuster pin 27 with respect to the control rod 17, as shown in FIG. 1, the adjuster 31 has a fixing long hole 33 and a cam long hole 32.
And a mounting bolt 34 and an eccentric cam 36 are provided. Both of the long holes 33, 32 are vertically spaced from each other, the upper fixing long hole 33 is formed long in the vertical direction (rod length direction), while the long hole for cam 32 is formed.
Is formed long in the direction perpendicular to the rod length direction.

In FIG. 2 showing a II-II cross section of FIG. 1, a female screw hole 47 for a mounting bolt and a female screw hole 48 for an eccentric cam are formed in the control rod 17 for each adjuster 31. The eccentric cam 36 integrally has a shaft center part 36a, and a male screw is formed on the shaft center part 36a. The eccentric cam 36 is inserted into the cam long hole 32, and the shaft center portion 36a is screwed into the cam female screw hole 48. The mounting bolt 34 is inserted into the washer 35 and the fixing long hole 33 and is screwed into the female screw hole 47, and the adjuster 31 is fastened to the rod 17 via the washer 35.

In FIG. 3 showing the III-III cross section of FIG. 1, an eccentric cam is shown.
36 is eccentric from the shaft center of the shaft center portion 36a, and the eccentric cam 3
Groove 4 for inserting a tool such as a screwdriver on the tip surface of 6
9 is formed. Guide legs 31a are integrally formed on both sides of the adjuster 31, while flat cut-off surfaces 17b are formed on both sides of the rod 17, and the inner surfaces of the guide legs 31a are formed on the cut-off surfaces 17b on both sides. Are in contact. That is, by rotating the eccentric cam 36 about its axial center portion 36a, the eccentric cam 36 pushes the inner peripheral surface of the cam slot 32 to move the adjuster 31 in the vertical direction (rod length direction). ing.

In FIG. 4, the control rod 17 has a reference pin 39 and a guide ball 38, together with the above-mentioned injection amount adjusting device.
A positioning guide mechanism including a guide rail 41 and the like is provided, and the rail 41 has a groove 40 parallel to the rod.

In FIG. 5, the rail 41 is positioned by the pressure pin 45 and fixed to the engine wall 4 by the bolt 43. The cross-sectional shape of the groove 40 is formed in a U shape opening toward the rod 17 side. The reference pin 39 is arranged in a horizontal posture at a right angle to the rod 17, and its male screw portion 39a is screwed to the rod 17. The guide ball 38 is welded to the tip of the reference pin 39, and is fitted in the groove 40 so as to be vertically movable. The depth of the groove 40 is formed larger than the diameter of the guide ball 38, and a gap d is formed between the bottom surface of the groove 40 and the tip of the guide ball 38. 39b is a collar portion of the pin 39.

Next, the operation will be described. When the engine speed increases, the governor weight 1 shown in FIG. 4 expands and the governor first lever 12
, The sleeve 11 and the first lever 12 are pushed down against the elastic force of the governor spring (not shown), the second lever 13 is rotated in the fuel reducing direction, and the link 15 and the third lever 16
Push down control rod 17 via. Rod 17
By lowering, the control levers 30 shown in FIG. 6 are simultaneously rotated in the fuel reducing direction.

When the engine speed decreases, the governor weight 1 shown in FIG. 4 is closed to raise the rod 17 via the levers 12, 13, 16 and rotate the control rod 30 in the fuel increasing direction.

When finely adjusting the injection amount of each fuel injection valve 28, the mounting bolt 34 of FIG. 1 is slightly loosened, a tool such as a screwdriver is inserted into the groove 49 of the eccentric cam 36, and the eccentric cam 36 is rotated. For example, when the adjuster 31 and the adjuster pin 27 are rotated from the state shown in FIG. 1 in the arrow A direction, the positions of the adjuster 31 and the adjuster pin 27 are lowered, and by rotating in the opposite direction to the arrow A direction, the adjuster 31 and the adjuster pin 27 are raised.

In addition, the guide ball 38 as described above is provided, and the guide ball 38 is provided with the groove 40.
The rod 17 serves to prevent the rod 17 from rotating and to slide smoothly in the groove 40 in the vertical direction.

(Another embodiment) (1) In the embodiment shown in FIG. 7, a simple pin hole 50 is formed in the control rod 17 instead of the female screw hole for screwing the eccentric cam shaft center portion, and the shaft center portion of the eccentric cam 36 is formed. 36a is also formed in a simple round shaft shape, and a handle lever 52 is formed on the eccentric cam 36. The eccentric cam 36 is used as an adjusting jig by inserting it into the cam long hole 32 only when adjusting the injection amount. Therefore, while the engine is operating, the eccentric cam 36 is pulled out from the eccentric cam elongated hole 32.

(2) The embodiment shown in FIGS. 8 to 10 is an example provided with a sheet metal adjuster 31, and the adjuster 31 is press-formed into a U-shaped cross section. The other structure is similar to that of FIGS. 1 to 3, and corresponding parts are denoted by the same reference numerals.

(3) In the embodiment shown in FIGS. 11 to 13, the control rod 17 has only female screw holes 47 for mounting bolts,
The structure is such that the shaft center part 36a of the eccentric cam 36 is formed in a small-diameter round shaft shape on the side opposite to the rod side, and the fitting hole 53 of the shaft center part 36a is formed in the extension part 35a of the washer 35. The eccentric cam long hole 32 is formed in a bottomed shape, and the tool insertion groove 49 is formed in the shaft center portion 36a. That is, the washer extension 35a prevents the eccentric cam 36 from coming off.

(4) The embodiment shown in FIGS. 14 to 16 is provided with an adjuster 31 made of sheet metal having a U-shaped cross section, and an eccentric cam 36 having a small diameter round shaft-like axial center portion 36a as in FIG. The washer 35, and the extension portion 35a of the washer 35 has a hole 53 into which the shaft center portion 36a is fitted.
It is a structure that has formed. However, the cam long hole 32 is not bottomed, and therefore the eccentric cam 36 is in contact with the control rod 17.

(5) The cam long holes 32 may be formed so as to intersect with the rod length direction at an angle other than a right angle.

(Effects of the Invention) According to the present invention as described above: (1) Since the governor force is transmitted to the control lever 30 by utilizing the engagement between the adjuster pin 27 and the control lever 30, the rack and pinion. The cost of parts is lower than when using.

(2) Since the injection amount adjusting device using the eccentric cam 36 is provided for each unit injector type fuel injection valve 28, it is possible to surely eliminate the variation in the fuel injection amount between the cylinders, and to improve the multi-cylinder. The operating performance of the engine, that is, the combustion performance and speed control performance are improved.

In particular, it is possible to surely eliminate the non-uniform injection amount among the cylinders in the small injection range such as during idling, so that it is possible to surely eliminate the one-lung operation or the hunting phenomenon during idling.

(3) Since the eccentric cam 36 and the long hole 32 for the cam are used to finely adjust the fuel injection amount, the prior art is known.
Compared to the turnbuckle type structure like 61-190128, it can be made lighter and more compact.

That is, by achieving weight reduction, it is possible to prevent an increase in the weight of the sliding portion of the governor system, thereby preventing an increase in the inertial mass,
Good governor response can be secured.

Further, since the compactness can be achieved, even in a small multi-cylinder engine having a short cylinder pitch, the adjusting device can be attached with a sufficient space, and the attaching of the adjusting device becomes easy.

[Brief description of drawings]

FIG. 1 is a front view of a first embodiment of a fuel injection amount adjusting device to which the present invention is applied (enlarged view of arrow I in FIG. 4), and FIGS. 2 and 3 are II-II in FIG. 1, respectively. III-III sectional view, FIG. 4 is a longitudinal sectional view of the entire speed governor equipped with the adjusting device according to the present invention, FIG. 5 is an enlarged view of VV section in FIG. 4, and FIG.
VI-VI sectional view of the drawing, FIG. 7 is a longitudinal sectional view of the second embodiment, FIG. 8 is a front view of the third embodiment, and FIGS. 9 and 10 are IX-IX of FIG. 8 respectively. XX sectional view, FIG. 11 is a front view of the fourth embodiment, FIGS. 12 and 13 are XII-XII of FIG. 11, respectively.
XIII-XIII sectional view, FIG. 14 is a front view of the fifth embodiment, FIG.
FIG. 16 and FIG. 16 are XV-XV and XVI-XVI sectional views of FIG. 14, respectively. 11 ... Governor sleeve, 17 ... Control rod, 27 ... Adjuster pin, 28 ... Unit injector type fuel injection valve, 30 ... Control lever, 31 ... Adjuster, 32 ... Eccentric cam long hole, 33 ... Fixing long hole, 34 ... Mounting bolt, 36 ... Eccentric cam

Continuation of front page (56) References JP-A-60-1371 (JP, A) Actual opening 52-60516 (JP, U) Actual opening 51-56429 (JP, U) Actual opening 49-38815 (JP , U) Actually open 60-159841 (JP, U) Actually open 59-186435 (JP, U) Actually public 55-37726 (JP, Y1) Actual public 30-18303 (JP, Y1) Actual public Sho 13-17554 (JP, Y2)

Claims (1)

[Scope of utility model registration request] 1. A unit injector type fuel injection valve for each cylinder is provided with a fuel injection amount control lever,
An adjuster for each cylinder having an adjuster pin is provided on one control rod, each control lever is engaged with each of the above adjuster pins, the control rod is interlockingly connected to the governor, and the control rod is moved in the longitudinal direction. In a multi-cylinder internal combustion engine in which the control lever is simultaneously rotated to adjust the fuel injection amount, each adjuster is provided with a fixing long hole along the rod length direction and a cam long hole intersecting the rod length direction. Then, insert the mounting bolt into the fixing long hole, tighten the adjuster to the control rod so that it can move in the rod length direction, insert the cam rotatably into the long hole for the cam, and rotate the cam to adjust the rod length. A fuel injection amount adjusting device for a multi-cylinder internal combustion engine, which is movable in the vertical direction.