JPS58206802A - Device for increasing fuel injection in case of starting outboard engine - Google Patents

Abstract

PURPOSE:To provide the smooth and easy start of an engine by a method wherein an operation gearing mechanism for a clutch operating means for transmitting a power of the engine to a propeller and a clutch is provided with a gearing member for enabling a fuel injection in case of starting of the engine to be increased only when the clutch is placed at its neutral position. CONSTITUTION:When a clutch operating lever 33 in an outboard engine is rotated, a detent lever 31 is rotated through a lever shaft and is changed over to forward, rearward and neutral positions of a clutch device (not shown) through an intermediate link 32, intermediate lever 28 and intermediate shaft 26 etc. In response to this changing-over operation, a linking cam 37 is rotated, and when a plunger 43 is engaged with a central groove 39 of a cam surface 40 of a cam 37, the plunger 43 is projected by a spring 45 to cause a wire 47 to be pulled in the same direction as that of the plunger. A stopper 57 is rotated to a two- point chained line position through a limitation releasing lever 58 under a pulling action of the wire 47 and so it is possible to move a control rod 53 for an injector in such a direction as causing a fuel volume to be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a starting fuel increase device for an outboard motor equipped with a diesel engine, which increases the amount of fuel supplied to the engine when the clutch is in the neutral state, thereby making it easier to start the engine.

Generally, in diesel engines, in order to maintain constant combustion performance or improve fuel consumption, a limiter is installed that prevents the fuel injection device from supplying more than a certain amount of injection. On the other hand, when starting the engine, if the fuel injection amount is restricted in this way, starting performance will be poor, so the above-mentioned restriction device is canceled and the fuel is increased 1.5 to 2.0 times as much as during load operation. It is necessary to increase the amount of According to the present invention, such an increase in fuel amount at the time of starting can be performed in conjunction with clutch operation.

The structure of the present invention will be described below based on an illustrated embodiment. FIG. 1 shows the overall structure of an outboard motor equipped with a diesel engine. 2) and the lower case (3) are connected vertically, and the engine (5) covered by the cover (4) is mounted on the upper end of this drive unit (1), and the block-shaped engine/mount (6) It is loaded via.

(7) connects the drive unit (1) to the hull (11)
A clamping device to be attached to the clamping device (
A vertical hollow support (9) is supported vertically by a horizontal shaft (8) attached to the drive unit (1), and its upper case (2)
The hollow shaft (10) inserted into the hollow support (9) supports the hollow shaft (10) so as to be rotatable in the left-right direction, and the steering wheel (12) protrudes forward from the upper case (2). ) with the drive unit (
1) Turn left and right to perform steering.

The lower case (3) has a propeller shaft (13
) is pivotally supported, and a propeller (14) is attached to the outer end of this propeller shaft (13). On the other hand, the drive unit (1) has an upper case (2) and a lower case (
A drive shaft (15) is pivotally supported in the vertical direction of the engine (5), and the upper end of the drive shaft (15) is directly connected to the crankshaft (16) of the engine (5) (and the lower end is connected to the bevel gear). (17), (18), and a clutch dog (19).
13). (21) is a shift cam disposed on the side of this clutch device (20), and although a detailed explanation is omitted, by vertical movement of this shift cam (21), the spindle (21) connected to the clutch dog (19) is moved. ) before the clutch device (20).
Switches between reverse and neutral. And'(23
) is a link rod connected to this shift cam (21), and this link rod (23) is connected to the lower case (
3), extends upward inside the upper case (2), protrudes to the outside from the middle part of the upper case (2), passes through the hollow shaft (10), and connects the mount bracket (24) on the outside of the engine mount (6). ) is connected to the control mechanism installed on the

Therefore, to explain the structure of this operating mechanism next, in Figure 2 and below, first, the mount bracket (24) is
Its planar shape is somewhat horse-shaped, and the bolt (25), which is inserted upward, surrounds the front of the engine mount (6) in Figure 1, and is attached to the upper case (2).
It is fixed to the upper end flange (2a).

The mount bracket (24) has an intermediate shaft (26) pivotally supported on its front side through the side wall (24b) of the cavity (24a).
A first intermediate lever (27) is attached to the inner end of the link rod (24a), and a second intermediate lever (28) is attached to the other outer end of the link rod (24a).
; It is pivoted to the top of the door. Furthermore, mount plaque 7
) (24) A lever shaft (29) in the left and right direction is pivotally supported by penetrating the side wall (24b) of the lever shaft (29).
As shown in Fig. 3, a notched disk-shaped detent lever (31) is attached to the inner end, and the detent lever (31) has three detent recesses (30) (30) (30) formed on its outer periphery. One place on the outer periphery of the intermediate link (31)
) to the second intermediate lever (28). (33) is a clutch operating lever whose base end is fitted onto the outer end of the lever shaft (29). therefore,
When this operating lever (33) is rotated, the lever shaft (2
The detent lever (31) is rotated via the intermediate link (3).
2), the link rod (23) via the second intermediate lever (28), the intermediate shaft (26) and the first intermediate lever (27).
) is moved up and down, and as mentioned above, switching between forward/reverse and neutral is performed by moving the shift cam (21) up and down.

Further, as shown in Fig. 3, a mount placket (
24) A detent pin (36) is disposed that protrudes from inside the cylindrical case (34) screwed onto the wall and is always biased to protrude by a spring (35) within the case (34); This detent pin (36) engages with one of the four detent parts (30) (30) (30) when the detent lever (31) is in the forward, backward, and neutral positions, thereby holding it in each switching position. There is.

This FIG. 3 now shows the neutral state in which the central detent recess (30) is engaged.

Now, with respect to the structure of the operating mechanism as described above, in this embodiment, first, inside the operating lever (33), at the outer end of the operating lever shaft (29), as shown in FIG. Insert the linking cam (37) into the linking cam (3).
7) has a circumferential part (38) and a circumferential part (38) on its upper part.
A cam surface (40) consisting of a concave plexus (39) in the circumferential center of
)have. (41) is such a linking cam (3
Above 7), there is a cylindrical plunger case whose lower end flange (42) is fixed to the upper surface of the mount bracket (24) with bolts (59), and the plunger case (41) is fixed in the vertical direction. Guide hole (
A slidable plunger (43) with its lower end protruding toward the cam (37) is inserted into the cam (41a), and the plunger (43) and a hole screwed into the upper end of the guide hole (41a) are inserted into the plunger (41a). between the plunger (44) and the plunger (43).
A spring (45) biased to project downward at all times is interposed to bring the tip of the plunger (43) into contact with the cam surface (38). As shown in FIG. 5, the upper half of the plunger (43) is formed into a cylindrical shape, and the plunger (43) passes through the cylindrical portion (43a) in the diametrical direction, allowing the plunger (43) to slide. A long hole (46) is opened in the direction.

(47) is a connecting wire ear having 1t11 diametrical engagement pins (48) attached to its tip, and the engagement via (4)1/ is connected to the elongated hole '(43) of the plunger (43). 46
), the wire (47) is slidably engaged along the long hole (46), and the wire (47) is inserted into the cylindrical part (
43a) from the inside of the port 1-(44) center lead-in hole (
44a) to the outside. (49) (49)
shows a cut groove machined into each bolt (44) and plunger (43) in order to pass this wire (47) into the bolt (44) or plunger (43). Therefore, in the above configuration, the plunger (43) is moved against the cam surface (40) by the biasing force of the spring (45).
The operating lever (33
), the linking cam (37) moves its cam surface (40) to the I+ position while sliding the tip of the plunger (43), and the plunger (43) The concave groove (39) in the center of this cam surface (40)
When the plunger (43) is secured to the
7) will be pulled in the same direction. Therefore, in this embodiment, the plunger (43) is arranged in the concave groove (39).
When the wire (47) is engaged and the wire (47) is pulled, the clutch device (20) is in its neutral state. . By connecting to the fuel increase/decrease device (47) Oヮ4O, 7 (7) (5), it is possible to start and increase the amount of fuel increase/decrease only when the vehicle is in neutral.

Therefore, to explain an example of the structure of the fuel increase/decrease device side, first, in Fig. 1, the combustion chamber (51) of the engine (5)
A unit injector (52) that injects fuel into the combustion chamber (51) is installed in the unit injector (52), and the increase or decrease in fuel injection by the unit injector (52) is controlled by the unit injector (52) and the governor (52). This is done by sliding a control rod (53) connected to a motor (not shown). As shown in FIG. 4, a shaft (
54), and one end of which is supported by a spring (55).
), a stopper (57) is provided so as to face the tip of the control rod (53) and is biased to rotate to the position of the adjustment screw (56) at the other end. Now, the stopper (57) is in its normal position as shown by the two-dot chain line, and when the stopper (57) is in this position, the stopper (57) restricts the movement of the control rod (53) in the direction of increasing the amount of fuel. The starting amount is increased, that is, the normal 1.
It is regulated that the amount cannot be increased by 572.0 times. Then, remove the shaft (5) to which this stopper (57) is attached.
4) is attached with another limit release lever (58), and in this embodiment, this limit release lever (58) is attached to the limit release lever (58).
) is connected to the other end of the wire (47), and when this wire (47) is pulled, the stopper (57) moves to 2 in the figure.
The control rod (53) is rotated to the position shown by the dashed dotted line, thereby making it possible to move the control rod (53) in the direction of increasing the amount beyond the normal position, thereby making it possible to increase the starting amount. That is, as mentioned above, the wire (47) is pulled by the plunger (43) when the clutch is in neutral, releasing the restriction of the stopper (57), so when in neutral, sufficient fuel is added to facilitate starting. On the other hand, in the forward and backward movement positions, the limit state is automatically returned, so the amount will not be increased beyond the specified amount when loaded, and the original purpose of the limit device can be fully achieved. .

As can be understood from the above explanation, according to the present invention, when the clutch connecting the engine and propeller becomes neutral, it is possible to sufficiently increase the amount of fuel supplied to the engine and easily start the engine.
On the other hand, since it is not possible to increase the amount when the clutch is on, the amount cannot be increased more than the specified amount under load, and the original purpose of the engine-side fuel restriction device can be fully achieved. This has the effect of resolving to some extent the inconvenience of starting the engine with the clutch engaged, since starting performance deteriorates in this state. Further, by interlocking and connecting the linking member to the restriction device side, the fuel restriction can be automatically canceled when the vehicle is in neutral, and there is no need to perform a special restriction cancellation operation.

In this embodiment, the linking member that links the operating mechanism of the latch and the fuel increase/decrease device of the engine is installed in a separate body from the outboard motor body, which consists of the engine and drive unit, along with the operating mechanism. They are equipped together on the mount placket, and by doing this, you can combine them into one
Can be handled as one unit; easy to install;
Moreover, the effect of facilitating adjustment and repair can be obtained.

[Brief explanation of drawings]

Fig. 1 is an overall side view of the outboard motor showing the drive unit section, Fig. 2 is a cross-sectional plan view of the mount bracket to which the clutch control mechanism is attached, and Fig. 3 is the A--A in Fig. 2.
A cross-sectional view taken along line A, Figure 4 is a side view taken along line B-B in Figure 2 showing the connection between the mount bracket and the fuel increase/decrease device side, and Figure 5 shows the wire connection section attached to the mount bracket side. FIG. 2 is an exploded perspective view showing the mechanism of the (5) Engine, (14) Propeller,
(20), Clutch device, (24), Mount bracket, (33), Clutch operation lever, (3
7),,, Linking cam (linking member), (43) +++
Plunger (linking member).

Claims (1)

[Scope of Claims] 1. In an outboard motor in which power transmission from the engine to the propeller is interrupted or interrupted by a switching operation of a clutch operating tool, an operation interlocking mechanism between the clutch operating tool and the clutch is provided on the side of the fuel increase/decrease device of the engine. 2. A fuel increasing device for starting an outboard motor 2, characterized in that a linking member is provided that is linked to the clutch and allows fuel to be increased at the time of starting the engine only when the clutch is in neutral. , an outboard motor starting fuel increase device is equipped with a clutch operating mechanism and a linking member in a bracket separate from the outboard motor main body.