JP2000282834A - Oil-filling port for outboard motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate filling of lubricating oil by forming an oil filling port for lubricating oil on an upper surface of a cylinder head. SOLUTION: Lubricating oil reserved in an oil pan is filled from an oil-filling port 50 formed on an upper surface of a cylinder head 8 and is closed by an oil cap 51. The oil-filling port 50 is disposed upward of a valve end part 52, preferably disposed directly above it. The oil-filling port 50 for filling lubricating oil is formed on the upper surface of the cylinder head 8, and thereby the oil- filling port 50 approaches a ship body side, and lubricating oil is easily filled. If the oil-filling port 50 is to be arranged upward of a valve system 20 such as a valve end part 52, preferably directly above it, lubricating oil filled from the oil-filling port 50 flows down from each member of the valve system 20. Since mechanical loss is reduced when an engine is started immediately after the lubricating oil is filled, startability of the engine is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an oil inlet for an outboard motor.

[0002]

2. Description of the Related Art Generally, a four-stroke engine has a lubricating oil inlet provided in a cylinder head cover or a crankcase.

[0003]

However, in the case of a four-stroke engine mounted on an outboard motor, the cylinder head cover is disposed at the rear end from the layout of the engine. Becomes difficult.

In the case of an outboard motor, since a device such as a recoil starter and a magneto wheel is arranged on a crankcase, it is difficult to lay out a lubricating oil inlet.

The present invention has been made in consideration of the above circumstances, and has as its object to provide an outboard motor oil inlet that facilitates lubrication oil injection.

[0006]

In order to solve the above-mentioned problems, an oil inlet of an outboard motor according to the present invention has a camshaft vertically arranged in a cylinder head as described in claim 1. In an outboard motor provided with the engine described above, an oil inlet for injecting lubricating oil is formed on the upper surface of the cylinder head.

According to another aspect of the present invention, there is provided an outboard motor having an engine in which a camshaft is disposed vertically in a cylinder head.
An oil inlet for injecting lubricating oil is formed on a side surface of the cylinder head.

Further, in order to solve the above-mentioned problems,
As described in claim 3, a valve train is provided in the cylinder head, and the oil inlet is disposed above the valve train.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a left side view of an outboard motor to which the present invention is applied. As shown in FIG. 1, the outboard motor 1 includes an engine holder 2, and an engine 3 is installed above the engine holder 2. An oil pan 4 is arranged below the engine holder 2, and a bracket 5 is attached to the engine holder 2, for example, and the outboard motor 1 is mounted on a transom of a hull (not shown) via the bracket 5. . Further, the periphery of the engine 3 is covered with an outboard motor cover 6.

FIG. 2 is an enlarged side view of the engine, showing only the outboard motor cover 6 in cross section. FIG. 3 is a plan view of the engine 3. As shown in FIGS. 1, 2 and 3, the engine 3 mounted on the outboard motor 1
For example, it is a water-cooled four-cycle three-cylinder engine configured by combining a cylinder head cover 7, a cylinder head 8, a cylinder block 9, a crankcase 10, and the like, in which respective cylinders (not shown) are vertically arranged. For convenience, in the present embodiment, the cylinder disposed at the top is referred to as the first cylinder, and hereinafter the second and third cylinders are directed downward.

A cylinder block 9 is disposed at the forefront of the engine 3, behind (to the right of) a crankcase 10 disposed on the left side in FIGS. A cylinder head 8 is disposed behind the cylinder block 9. Further, the rear opening of the cylinder head 8 is covered by the cylinder head cover 7. The engine 3 includes a crankcase 10 and a cylinder block 9.
This is a vertical engine in which a crankshaft 11 is disposed substantially vertically in a joint portion with the engine (see FIG. 1).

As shown in FIG. 1, a shaft housing 12 is provided below the oil pan 4. A drive shaft 13 is disposed substantially vertically in the engine holder 2, the oil pan 4, and the shaft housing 12, and an upper end thereof is connected to a lower end of the crankshaft 11. The drive shaft 13 extends downward in the shaft housing 12 and is configured to drive a propeller 17 via a bevel gear 15 and a propeller shaft 16 in a gear case 14 provided at a lower portion of the shaft housing 12.

FIG. 4 is a rear view of the cylinder head 8 with the cylinder head cover 7 removed, showing a first embodiment of the present invention. FIG. 5 is a sectional view taken along the line VV of FIG. 4, and FIG. 6 is a view taken along the arrow VI of FIG.

As shown in FIGS. 4 to 6, this engine 3
A valve train 20 is provided in the cylinder head 8.
The valve gear 20 includes a camshaft 21 arranged in parallel with the crankshaft 11, an intake valve 22 and an exhaust valve 23, and valve intake / exhaust cams 24 and 25 provided on the camshaft 21. These intake and exhaust cams 2
The intake and exhaust rocker arms 26 and 27 for transmitting the rotations of the intake rollers 4 and 25 to the two valves 22 and 23, and the intake and exhaust rocker shafts 28 and 29 for rotatably supporting the rocker arms 26 and 27. It is provided as a main component.

The valve gear 2 of the engine 3 shown in this embodiment
0 has two intake valves 22 and 22 and one exhaust valve 23 for each cylinder, and the intake cam 24 and the intake cam 24 for each cylinder corresponding to these valves 22, 22 and 23 on the camshaft 21. A cam row including an exhaust cam 25 is provided.
In the present embodiment, the two intake valves 22 are opened and closed by one intake rocker arm 26.

The camshaft 21 is rotatably supported by bearing bosses 31a to 31d formed integrally with the cylinder head 8. A cam driven gear 3 which is a driving mechanism of the camshaft 21 is provided at a lower end portion of the camshaft 21.
2, the rotation of the crankshaft 11 is transmitted via a timing chain 33, not shown in detail.

Each rocker shaft 28, 29 has a bearing boss 3
It is installed on 1a-31d, and is fixed on each bearing boss 31a-31d by bolt 35 etc. via bracket 34. Each rocker arm 28 is attached to each rocker shaft 28, 29.
The support portions 26a, 27a of the rocker shafts 26, 27 are rotatably supported, and the brackets 34 for fixing the rocker shafts 28, 29 and the support portions 26a, 2 of the rocker arms 26, 27 are provided.
A spacer spring 37 is disposed between the spacers 7a and 7a to position the rocker arms 26 and 27 on the rocker shafts 28 and 29.

One end of each rocker arm 26, 27 contacts the top of each valve 22, 23. Then, by the rotation of the camshaft 21, the cam floor surfaces 26b, 27b formed at the other ends of the rocker arms 26, 27 are pushed up by the intake / exhaust cams 24, 25 to open and close the valves 22, 23. The valves 22 and 23 are held in a normally closed state by a valve spring 38.

The lubricating oil stored in the oil pan 4 is injected from an oil injection port 50 formed on the upper surface of the cylinder head 8, as shown in FIGS. The oil inlet 50 is closed by an oil cap 51.

Further, the oil inlet is provided in the valve gear 20.
For example, the top of intake valves 22 and 23 and this valve 2
The contact points with the ends of the rocker arms 26 and 27 for opening and closing the members 2 and 23, that is, above the so-called valve end 52, are preferably disposed directly above.

FIG. 7 is a rear view of the cylinder head 8 with the cylinder head cover 7 removed, showing a second embodiment of the present invention. The same components as those of the first embodiment are denoted by the same reference numerals.

As shown in FIG. 7, this cylinder head 8
(Not shown) provided with a cam driven pulley 62 as a drive mechanism of the camshaft 21 at the upper end of the camshaft 21. Although not shown in detail, the crankshaft is driven through a timing belt (not shown). Shaft 11
It has a structure to transmit the rotation of.

Since the upper end of the camshaft 21 projects outside the cylinder head 8 and a cam-driven pulley 62 is provided at this projection, the oil inlet 60 is formed at a high position on the side of the cylinder head 8 and the oil cap 61 is formed.
Is closed by.

Next, the operation of the present embodiment will be described.

Since the oil inlet 50 for injecting the lubricating oil is formed on the upper surface of the cylinder head 8, the oil inlet 50 is closer to the hull (not shown) than when the oil inlet 50 is provided in the conventional cylinder head cover 7. Lubricating oil injection becomes easy.

If the oil injection port 50 is provided above, preferably directly above, the valve operating device 20 such as the valve end portion 52, the lubricating oil injected from the oil injection port 50 will make each member of the valve operating device 20 available. As a result, the mechanical loss is reduced when the engine 3 is started immediately after lubricating oil is injected, so that the startability of the engine 3 is improved.

Further, for example, a driving mechanism (cam driven pulley 62) for driving the cam shaft 21 on the upper surface of the cylinder head 8
Even if equipment such as the above is arranged and the layout of the oil injection port is difficult, if the oil injection port 60 is formed at a high position on the side surface of the cylinder head 8, almost the same effect as when the oil injection port 60 is disposed on the upper surface of the cylinder head 8 is obtained. Obtainable.

[0029]

As described above, according to the oil injection port of the outboard motor according to the present invention, lubricating oil is injected into an outboard motor having an engine in which a camshaft is vertically arranged in a cylinder head. Since the oil inlet to be formed is formed on the upper surface of the cylinder head, the oil inlet approaches the hull side to facilitate lubrication oil injection.

Further, in an outboard motor having an engine in which a camshaft is vertically arranged in a cylinder head, an oil inlet for injecting lubricating oil is formed on a side surface of the cylinder head. Close to facilitate lubrication oil injection.

Further, since a valve gear is provided in the cylinder head, and the oil inlet is disposed above the valve gear, lubricating oil flows down each member of the valve gear during oil injection, and flows down. Improve startability.

[Brief description of the drawings]

FIG. 1 is a left side view showing an embodiment of an oil inlet of an outboard motor according to the present invention.

FIG. 2 is an enlarged side view of an engine portion.

FIG. 3 is a plan view of an engine part.

FIG. 4 is a rear view of the cylinder head in a state where a cylinder head cover is removed (first embodiment), as viewed from an arrow IV of the engine shown in FIG. 2;

FIG. 5 is a sectional view taken along the line VV in FIG. 4;

FIG. 6 is a view taken in the direction of arrow VI in FIG. 4;

FIG. 7 is a rear view of the cylinder head with the cylinder head cover removed (second embodiment).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outboard motor 3 Engine 8 Cylinder head 20 Valve train 21 Camshaft 50, 60 Oil inlet

Claims (3)

[Claims] 1. An outboard motor equipped with an engine having a camshaft arranged vertically in a cylinder head, wherein an oil inlet 50 for injecting lubricating oil is formed on an upper surface of the cylinder head 8. Oil inlet for external unit. 2. An outboard motor having an engine in which a camshaft is disposed vertically in a cylinder head, wherein an oil injection port 60 for injecting lubricating oil is formed on a side surface of the cylinder head 8. Oil inlet for external unit. 3. A valve train 20 is provided in the cylinder head 8. Above the valve train 20, the oil inlet 50,
The oil inlet of the outboard motor according to claim 1, wherein the oil inlet is provided.