JPS5919777Y2 - engine blazer device - Google Patents

Description

[Detailed explanation of the idea] This invention relates to an engine blazer device.

Usually, the blazer device is installed in an exposed state on the outer wall of the engine.

In this case, there is a concern that oil may leak from the joint surfaces of the components of the blazer device.

In order to solve the above-mentioned problems, the present applicant has provided a blazer device 2 at the upper part of the inner surface of a gear case 1, and a wall 4 between this and a timing gear group 3, as shown in FIG. It has previously been proposed that the blow-by-cuss guide path 5 is divided into oblong shapes.

In this case, the oil return hole 6 is formed in the inner end recess 5a of the blow-by gas guide path 5, but the oil splashed away by the gear group 3 enters from the oil return hole 6, and this and the return oil are mixed with each other. There is a problem in that the gas is blown away by the blow-by gas passing through the hole 6, enters the blazer device 2, and is emitted to the outside.

This idea solves the above problems by covering the oil return hole with an oil shield plate to allow oil to pass through, and also creates a structure to prevent oil from entering by allowing the oil shield plate to be attached to the oil return hole. The objective is to make it simple and inexpensive, and to enable it to be easily implemented on existing engines without any modification.

Examples of this invention will be described below based on the drawings.

FIG. 2 is a sectional view showing the inner surface structure of the gear case, and FIG. 3 is a sectional view taken along line III--III in FIG.

Inside the gear case 10, a crank gear 11. A timing gear group G such as a cam gear 12, a balancer gear 13, and an idle gear 14 that interlocks these three, a fuel injection pump 15, a governor device 16, and the like are accommodated.

A blow-by gas guide path 1 is provided at the upper part of the inner surface of the gear case 10.
7 is formed, and a blazer device 18 is installed at the rear end of this.
is installed.

As shown in FIG. 3, the blow-by gas guide path 17 is divided by a peripheral wall of the gear case 10, a partition wall (bottom wall) 17a protruding from the inner surface thereof, and a joint projecting wall 19a protruding from the crankcase 19. There is.

The rear end of the partition wall 17a is recessed along the gear outline, and an oil return hole 20 is formed extending from the joint surface of the bottom wall of the recess to a midway part near the protruding base end.

In addition, reinforcing ribs 2 are provided on one wall forming the above-mentioned recess.
1 protrudes horizontally.

The blazer device 18 is configured such that an opening of a blazer valve chamber 33 formed by casting is closed with an oval-shaped cover 34, and a valve port 22 provided through the cover 34 is opened and closed by a reed valve type blazer valve 23. It will be done.

The blazer valve chamber 33 is divided into an expansion chamber 25 and a gas outlet chamber 26 by a partition plate 24 made of a thin steel plate.

27 is an oil flow port, and 32 is an outlet pipe.

The oil scattered by the timing gear group G mentioned earlier is
In order to prevent the oil return hole 20 from jumping into the blow-by gas guide path 17, the oil return hole 20 is connected to the oil shielding plate 28.
covered with

As shown in FIG. 4, this oil shielding plate 28 has an oil shielding wall 29 that closes the oil return hole 20 and a labyrinth wall 30 that covers the upper part of the oil return hole 20 and forms a maze. It is formed into.

An engagement groove 31 is formed in the middle of the oil shielding wall 29 to engage with the bottom wall of the recess on the far end side of the oil return hole 20.

The oil shield plate 28 formed in this way is assembled from the joint surface side of the gear case 10 as shown in FIG.
comes into contact with the lower surface of the reinforcing rib 21 and the wall facing the rib 21, and the engagement groove 31 engages with the bottom wall of the recess, thereby maintaining the mounting position.

The action will be explained below.

The blow-by gas in the crank chamber passes through the gear chamber, the blow-by gas guide path 17, and the valve port 22 in this order to the blazer valve chamber 33.
and is discharged from the outlet pipe 32.

During this movement process, the oil separated by the rear end of the blow-by gas guide path 17 and the blazer mechanism 18 is
The oil is returned to the gear chamber through the oil return hole 20.

At this time, the oil flows down through the gaps between the oil shield plate 28, the partition wall 17a, and the oil return hole 20.

On the other hand, the oil mainly splashed by the idle gear 14 flies toward the oil return hole 20, but this is blocked by the oil shielding wall 29 of the oil shielding plate 28 and does not enter inside the oil return hole 20. .

Blow-by gas also tries to pass from the hole 20 to the blow-by gas guide path 17, but since the ventilation gap is small and the upper side of the oil return hole 20 is partitioned off by a labyrinth wall 30, the flowing oil is not blown away by the gas. It won't happen.

The oil shielding plate 28 may be deformed as shown in FIGS. 5A and 5B, or the plate surface may be extended as shown by the imaginary line in FIG. 3 to completely cover the upper side of the oil return hole 20. You may also divide it into

As explained above, in this invention, the oil return hole is blocked with an oil shield plate to the extent that oil can pass through, and the oil splashed by the gear is prevented from jumping from the oil return hole into the blow-by gas guide. Since the blow-by gas is prevented from blowing through the oil return hole, the return oil and gear splashed oil are blown away by the blow-by gas.
It can completely prevent air from being released from the blazer device to the outside.
Engine oil consumption can be significantly reduced.

In addition, the oil shield plate described above uses the oil return hole and is supported by fitting into this hole, so there is no need to provide any mounting structure such as screws or screw holes to attach the oil shield plate.
This simplifies the structure for preventing oil intrusion and makes it cheaper, and it can also be easily implemented in existing engines without any modification.

[Brief explanation of the drawing]

Figure 1 is a cutaway front view of main parts of an engine showing a conventional example;
Figures to Figures 5 show an embodiment of this invention, Figure 2 is a sectional view showing the inner structure of the gear case, and Figure 3 is Figure 2 III.
-III line sectional view, Figure 4 is a perspective view of the main parts of the gear case,
FIGS. 5A and 5B are sectional views of essential parts showing a modification of the oil shield plate. 10... Gear case, 17... Blow-by gas guide path, G... Timing gear group, 1
7a...17 bottom wall (partition wall), 18...
... Blazer device, 19... Crank case, 2
0...Oil return hole, 28...Oil shield plate, 31...Engagement groove.

Claims (1)

[Claims for Utility Model Registration] 1. A blow-by gas is provided in the upper part of the gear case 10 by making the partition wall 17a protruding from the upper part of the inner surface of the gear case 10 of the engine come into contact with the crank case 19. In the case where the guide path 17 is formed and the blazer device 18 is disposed deep in the blow-by gas guide path 17, an oil return hole 20 is provided in the bottom wall 17a of the blow-by gas guide path 17, and the timing gear group This engine blazer device is characterized in that an oil return hole 20 is covered with an oil shield plate 28 which blocks splashed oil from G, and the oil return hole 20 is supported by fitting into the oil return hole 20. 2 Utility Model Registration In the engine blazer device according to claim 1, an oil return hole 20 is provided from the joint surface of the bottom wall 17a of the blow-by gas guide path 17 with the crankcase 19 toward its protruding base end. formed. 3. In the engine blazer device according to claim 2 of the utility model registration claim, the oil shielding plate 28 is configured to be able to be inserted into the oil return hole 20 from the side of the bottom wall 17H that connects to the crankcase 19. thing.