JPS60113031A - Valve gear system driving device for vertical shaft type internal-combustion engine - Google Patents

Abstract

PURPOSE:To eliminate unbalance due attributable to a flywheel as well as to facilitate lubrication to a chain and a gear, by installing the chain or the gear, situated between a cam shaft and a crankshaft in a valve gear system driving device, in the vicinity of a joined surface with an oil pan on an engine bottom part. CONSTITUTION:A cam shaft 11 driving each of suction and exhaust valves 10 and a unit injection belonging to a Diesel engine 2 is set up in parallel with a crankshaft 6 but this cam shaft 11 is installed in the side of a cylinder head 9 and constitutes an overhead cam type Diesel engine 2. Accordingly, in order to drive this cam shaft 11 with the crankshaft 6, a steel plate 21 is applied to a bottom part of a cylinder block 12, and an oil pan 13 is being attached to a lower part of the steel plate 21 whereby a sprocket 13 is attached to a lower end of the cam shaft 11, being projected inside the oil pan 13, while each chain 16 is stretched between the sprocket 14 and a sprocket 15 attached to the crankshaft. For your information, as occasion calls a gear driving system may be applicable instead of this chain driving system.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a valve train drive system for a four-cycle vertical shaft internal combustion engine, which is mainly used as an outboard engine.

[Prior art]

Conventionally, four-stroke internal combustion engines used as outboard engines typically have a vertical shaft with the crankshaft as the axle, as well as a camshaft that drives the intake and exhaust valves, and a tee cell. In the case of engines, the camshafts driving the fuel injection pumps or unit injectors are provided either separately or in common, and in a vertical direction parallel to the crankshaft.

As a means for driving the above-mentioned camshaft with the crankshaft 1111, various methods are used, such as a timing belt type, a chain 7 type, and a shift gear type.

A flywheel is usually attached to the upper end of the crankshaft of a vertical-shaft internal combustion engine like the one mentioned above, and this means that a power generation dynamo can be connected to the flywheel, or that the engine can be manually started by operating it from the outside. This is because the flywheel is best located at the top of the engine, as the coil starter is sometimes attached to the top of the flywheel.

When installing the governor device that increases or decreases the fuel injection amount of the fuel injection device of the internal combustion engine mentioned above on the camshaft, be sure to check the governor device and the connection between the governor device and the fuel injection device. Therefore, it is optimal to position the governor device at the top.

Therefore, some vertical-shaft internal combustion engines have a pulley for the timing belt that drives the camshaft installed directly below the flywheel attachment part of the crankshaft, but in this case, the flywheel protrudes into two parts, and is unbalanced. The disadvantage is that there is a balance.

On the other hand, the timing bell l- can be used in oil, but the drive system using a chino and gears,
The present invention focuses on the fact that sufficient lubrication is necessary for the chain or gear, and uses the chain or gear for the camshaft drive system.

[Purpose of the invention]

SUMMARY OF THE INVENTION Therefore, the present invention eliminates the drawbacks of the conventional camshaft drive device of a vertical shaft type internal combustion engine, and provides a valve train drive device that does not cause unbalance caused by the flywheel and can easily lubricate the drive device. [Structure of the Invention] That is, the valve train drive device for a vertical shaft internal combustion engine of the present invention has the following features:
In order to drive the camshaft that drives the fuel injection device and the intake and exhaust valves of the vertical axis internal combustion engine by the crankshaft, a chain gear disposed between the camshaft and the crankshaft is connected to the internal combustion engine. It is constructed by installing the oil pan near the bottom of the oil pan.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic side view of an outboard motor equipped with a Tee cell engine as a vertical shaft type internal combustion engine in an embodiment of the present invention, and FIG. Figure 1 Cell engine ○ Enlarged side sectional view of main parts, No. 3
The figure is a plan cross-sectional view of FIG. 2, and this tea cell engine 2 is of a vertical 11+11 type 4 cycle type in which the crankshaft is an axle.

First, the outboard motor attached to the stern 1 of the small boat shown in Fig. 1 consists of a diesel engine 2 and a drive unit 3.
The diesel engine 2 rotates a propeller screw 4 provided at the bottom of the drive unit 6 to propel the small boat in the direction of arrow A. It is designed to be steered by moving left and right.

In this tea cell engine, the crankshaft 6 is vertical! I
II, therefore the piston 7 slides horizontally,
A unit injector 8 is attached to a cylinder head 9 facing the combustion chamber on the top side of the piston 7, and combustion caused by fuel injection from this unit injector 8 causes the piston 7 to reciprocate in the horizontal direction, and the unit injector 8 is installed in the vertical direction. The crankshaft 6 is rotated.

Next, the intake and exhaust valves 10 shown in FIG. 2 and the fuel 'f+' shown in FIG.
A camshaft 11 that drives each unit injector 8, which is an injection device, is arranged parallel to the crankshaft 6, that is, in a vertical direction.
It is provided on the side and constitutes a so-called over-throttle cam type tea cell engine 2.

Therefore, in order to drive this camshaft 11 by the crankshaft 6, in this embodiment, a steel plate 21 is brought into contact with the bottom of the cylinder head 9 and the cylinder block 12 of this tea cell engine 2, and an oil pan 16 is placed at the bottom of the steel plate 21. The lower wheel of the camshaft 11 is protruded into the oil pan 16 to reach the sprocket 14, and the chain wheel 16 is stretched between it and the sprocket 15 which is attached to the crankshaft 6. As shown in FIG. 3, this chain/16 is installed in the oil pan 16 via a tensioner 22.

In the above embodiment, since the cylinder throat 9 and cylinder block 12 are separate bodies, the steel plate 21 is interposed.
In the case of a tea cell engine 2 in which the cylinder head 9 and the seven-ring block 12 are integrated, this steel plate 21 is unnecessary and the oil pan 16 can be directly attached.

However, instead of the chino system using the sprockets 14 and 15 and the chino 16 in the above embodiment, a gear system in which the camshaft 11 is driven by the crankshaft 6 using a double gear group can also be applied, and in this case. , a gear case for the gear group is provided within the oil huff 16.

Furthermore, although this embodiment shows a diesel engine 2 equipped with a unit injector 8 as a fuel injection device 7, the present invention also applies to a diesel engine having a separate fuel injection pump that pumps fuel to a fuel injection valve. This invention can be applied,
The present invention can also be applied to Punochrond type internal combustion engines other than the old bed type.

[Effect]

In the valve train drive system of the diesel engine 2, which has a structure of 10 parts, the camshaft 11 is driven by the crankshaft 6, or the gear group is connected to the oil nozzle 13 at the bottom of the diesel engine 2. Since it is provided near the mating surface, the chenno 16j or the gear group is sufficiently lubricated.

As a result, the protrusion of the flywheel 17 from the upper end of the crankshaft 6 is reduced, and the governor 18 can be provided at the upper end of the crankshaft 6, making inspection thereof easier.

Furthermore, as shown in FIG. 2, a lubricating pump 1 driven by the camshaft 11 is built into the oil pan 16 at the lower end of the cam 1IIll111 than the sprocket 14.
9 and its suction pipe 20, the head on the suction side becomes lower, making it easier to suck lubricating oil.

〔Effect of the invention〕

Therefore, in the diesel engine to which the present invention is applied, even when the flywheel is attached to the upper end of the crankshaft, there is no imbalance due to the flywheel protruding upward, and moreover, when the camshaft is driven by the crankshaft, the engine This also has the advantage that gears can be easily lubricated.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of an outboard motor equipped with a diesel engine as a vertical shaft internal combustion engine according to an embodiment of the present invention;
This figure is an enlarged side sectional view of the main part of the diesel engine shown in FIG. 1, and FIG. 3 is a plan sectional view of FIG. 2. 2...Teiser engine, 6...crankshaft, 8...
Unit injector, 10... Intake and exhaust valve, 11...
・Cam++qb, 13...oil pan, 14...
Sprocket, 15, sprocket, 16... Cheno. Agent: Patent Attorney Makoto Ogawa − Patent Attorney: Ken Noguchi Patent Attorney: Kazuhiko Saishita

Claims (1)

[Claims] In order to drive the camshaft that drives the fuel injection device and intake/exhaust valves of a vertical axis type internal combustion engine by the crankshaft, a check 7 or a gear disposed between the camshaft and the crankshaft is installed inside the camshaft. - A valve train drive device for a vertical shaft type internal combustion engine, characterized in that it is installed near the mating surface with the oil pane at the bottom of the combustion engine.