JPH0235137B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a governor device for a vertical shaft diesel engine mainly used as an outboard engine.

Conventionally, mixed fuel two-stroke gasoline engines have been mainly used as internal combustion engines for outboard motors mounted on the sterns of small boats.

This is because outboard motors need to be lightweight and compact, and diesel engines, which are heavy and have a large exterior, are rarely used, but due to the significant rise in the price of gasoline fuel in recent years, internal combustion engines for outboard motors It is hoped that the engine will adopt a diesel engine.

When using a diesel engine as an internal combustion engine for an outboard motor, the most important thing is to make the engine lighter and more compact. When installing a governor device that moves the governor spindle using the centrifugal force of the governor weight in a vertical axis diesel engine equipped with an Ector, the space for the governor device itself needs to be quite deep in the axial direction of the governor spindle. There is a problem.

Therefore, the idea of Japanese Utility Model Publication No. 36-22017 was made to reduce the size of the diesel engine and make handling of each part easier, but in this case the governor device was installed in the crankcase, and moreover, it was mounted on the camshaft. Because of this, the length in the crankshaft direction becomes long, which poses a problem in terms of making the engine more compact.

In addition, in order to design and manufacture a governor device with a compact structure, a device was proposed in Japanese Utility Model Publication No. 52-23642, but in this case too, the governor device was installed inside the gear case outside the water jacket part of the cylinder liner. In addition, since the camshaft for fuel injection is provided parallel to the crankshaft, the length of the camshaft becomes long, making it difficult to make the engine more compact.

Furthermore, in order to simplify the overall mechanism by simplifying the shape of the governor lever, the invention of Japanese Utility Model Publication No. 47-7768 regarding a governor connection device for diesel engines was made, but in this case the governor device was installed at the end of the camshaft. As a result, the length in the camshaft direction becomes longer, and the length in the direction perpendicular to the camshaft becomes longer due to the provision of the gear, which has the drawback that compactness cannot be achieved.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a governor device that eliminates the drawbacks of the conventional governor device and allows the engine to be made compact and lightweight in a vertical shaft diesel engine having a unit injector in the cylinder head. That is.

That is, the present invention provides a vertical shaft type diesel engine in which a unit injector is arranged in the cylinder head, a plurality of horizontally oriented cylinders are arranged vertically in parallel, and the crankshaft is arranged vertically. A concave governor chamber is formed in the upper part of the cylinder block at the periphery of the cylinder liner, and includes a governor drive shaft arranged parallel to the crankshaft, a governor weight attached to the drive shaft and opened and closed by centrifugal force, and the governor weight. A governor device having a governor spindle that converts the opening and closing of the cylinder into an axial displacement on the center of the drive shaft is provided in the governor chamber, and the governor device has the center of the governor drive shaft aligned with the crankshaft on a plane orthogonal to the center of the cylinder. It consists of a governor device for a vertical axis diesel engine located off-center.

An embodiment of the present invention will be described below with reference to the drawings, and the schematic side view in FIG. The diesel engine 2, which is an internal combustion engine for the outboard motor, rotates the propeller screw 4 installed at the bottom of the drive unit 3 to propel the small boat in the direction of arrow A. The outboard motor is operated by moving a steering handle 5 projecting forward from the boat to the left and right.

Next, FIG. 2 shows an enlarged plan sectional view of the inside of the diesel engine 2 shown in FIG. The crankshaft 11 provided in the vertical direction is rotated to rotate the propeller screw 4 via the drive unit 3.

Normally, in the overhead cam type diesel engine 2 as described above, the camshaft 12 can be positioned directly above the cylinder center, but in the present invention, the overall length of the engine is shortened as the diesel engine 2 for an outboard motor. The camshaft 12 is connected to the cylinder head 7.
The unit injector 9 is located at the lowest possible position and inclined toward the side where the camshaft 12 is provided.
is actuated via a valve arm 13.

In the above diesel engine 2, as shown in FIG. 2 and FIG. 3 which is a side sectional view of FIG.
The governor chamber 15 is arranged at a position offset from the center of the crankshaft 11 of the cylinder block 6. The governor chamber 15 and the crankcase 16 communicate with each other through a communication passage 17, and a communication passage 19 that communicates between the valve arm chamber 18 at the upper part of the cylinder head 7 and the governor chamber 15 is connected to the water jacket section 20 of the cylinder liner 14.
It is formed on the outside of.

Next, a governor device 22 (not shown) equipped with a governor drive pulley 30 to which the drive from the crankshaft 11 is transmitted via a timing belt 21 is provided in the governor chamber 15.

In this governor device 22, as shown in FIG. 4, which is a side sectional view of FIG. 3 seen from the back side, and FIG. 5, which is a front sectional view seen from the - direction of FIG. The governor drive shaft 31 is rotatably supported by a bearing 33 on the 32 side.

A plurality of governor weights 34 are provided in the governor housing 28 provided at the lower part of the governor drive shaft 31, and are arranged so that the centrifugal force of the governor weights 34 and the spring force of the governor spring 35 are balanced. When the rotational speed of the engine increases and the centrifugal force of the governor weight 34 exceeds the spring force of the governor spring 35, the governor spindle 42 is moved to the floating lever by the regulator lever 38 supported by the regulator lever shaft 39. pin 3
7, the floating lever 36 rotatably supported is pressed, and the communication path 1
A plunger 43 shown in FIG. 2 of the unit injector 9 is rotated via a link 40, a lever 41, etc. disposed within the unit injector 9, and is operated in the direction of fuel reduction.

In the governor device 22 having the above configuration, the length of the governor spindle 42 is considerably long.
The governor chamber 15 is provided so as not to interfere with the cylinder liner 14 at a position offset from the center of the crankshaft 11 of the cylinder block 6.

Here, in this embodiment, since the cylinder liner 14 is cooled by the seawater cooling bathing section 20, when the seawater temperature is increased from 40° to 50°C or higher,
This causes various problems such as salt in the seawater precipitating and adhering to the wall surface of the swimsuit, so the cooling temperature must be kept low, and the top surface of the piston 10 when the piston 10 is at its lowest point. A water jacket 20 is provided only in the heated portion of the cylinder liner 14 on the side of the upper cylinder head 7 to prevent overcooling of the lower part of the cylinder liner 14 and to prevent distortion in the cylinder liner 14. .

As a result, the governor chamber 15 can be formed by effectively utilizing the portion of the cylinder liner 14 where the swimsuit section 20 is not provided, and the diesel engine 2 can be made compact.

Further, by using the timing belt 21 that rotates the camshaft 12, the governor drive pulley 30 of the governor device 22 can be conveniently arranged.

Further, a link 40 for controlling fuel increase/decrease from the governor device 22 to the unit injector 9 is also connected to the communication path 1 which communicates the governor chamber 15 and the valve arm chamber 18.
However, the valve arm chamber 18 and the inside of the crankcase 16 are connected to the communication path 1 via the governor chamber 15.
9 and 17, the breathing inside the crankcase 16 and the valve arm chamber 18 is carried out effectively.Furthermore, as shown in FIG. By providing the communication passages 17 and 19 at the upper part between the
serves as a discharge passage for the blowby gas in the crankcase 16 and the valve arm chamber 18, and the blowby gas is discharged from the breather chamber 29 via the governor chamber 15 to the outside.

Note that the position of the breather chamber 29 is not limited to the above embodiment, and may be provided on the valve arm chamber 18 side.

Therefore, the governor device of the present invention has the advantage that a vertical shaft diesel engine having a unit injector in the cylinder head can be made extremely compact and lightweight.

As a result, it is now possible to use a diesel engine as an internal combustion engine for an outboard motor, which has conventionally mostly been a gasoline engine, making it possible to significantly reduce fuel costs.

Note that the present invention can be effectively applied mainly to diesel engines for outboard motors.

[Brief explanation of drawings]

Fig. 1 is a schematic side view of the main part of the stern of a small boat equipped with an outboard motor according to an embodiment of the present invention;
The figure is an enlarged plan sectional view of the main parts of the diesel engine shown in Fig. 1, Fig. 3 is a side sectional view of the diesel engine shown in Fig. 2, and Fig. 4 is a side sectional view of the governor device shown in Fig. 3, seen from the back side. , FIG. 5 is a front sectional view seen from the - direction of FIG. 4. 2... Diesel engine, 6... Cylinder block, 7... Cylinder head, 9... Unit injector, 11... Crankshaft, 15... Governor room, 16... Crank case, 17... Communication path,
18...Valve arm chamber, 19...Communication path, 22...Governor device, 40...Link.

Claims (1)

[Claims] 1 Unit injector 9 on cylinder head 7
In a vertical shaft type diesel engine in which a plurality of horizontally oriented cylinders are arranged vertically in parallel, and the crankshaft 11 is arranged vertically, in the periphery of the uppermost cylinder liner 14,
A concave governor chamber 15 is located at the top of the cylinder block 6.
The governor drive shaft 31 is arranged parallel to the crankshaft 11, the governor weight 34 is attached to the drive shaft 31 and opens and closes by centrifugal force, and the opening and closing of the governor weight 34 is controlled in the axial direction on the center of the drive shaft. A governor device 22 having a governor spindle 42 that converts the displacement into displacement is provided in the governor chamber 15, and the governor device 22 is arranged such that the center of the governor drive shaft is located away from the center of the crankshaft on a plane orthogonal to the center of the cylinder. A governor device for a vertical shaft diesel engine.