JPH09209736A - Oil level gauge guide device - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide an oil level gauge guide device capable of promptly checking the oil level after the engine is stopped in an engine that also serves as a guide hole of the oil level gauge and an oil return passage. A plurality of oil return passages (9, 12, 13) are formed which penetrate a cylinder head (3) and a cylinder block (1) of an internal combustion engine (11) and connect an upper surface (3a) of the cylinder head (3) and an inside of an oil pan (8). An oil inflow restricting member 16 for restricting oil inflow to the opening of one of the openings on the upper surface 3a of the cylinder head 3
And the oil return passage 9 provided with the oil inflow limiting member 16 is used as the guide hole 9 of the oil level gauge 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides an internal combustion engine that uses an oil return passage for returning engine oil in a head cover to an oil pan as a guide hole for an oil level gauge, so that the oil level can be confirmed quickly. The present invention relates to an oil level gauge guide device.

[0002]

2. Description of the Related Art An oil level gauge is used to check the amount of engine oil in an oil pan.
A scale indicating the proper amount of engine oil is provided at the tip of the gauge. The structure of the oil level gauge is roughly classified into a flat plate type and a wire type. Generally, the flat plate type is often used. However, when the guide hole of the oil level gauge is bent in three dimensions, Wire type is adopted.

Such an oil level gauge is generally inserted in a dedicated guide hole, but in an internal combustion engine, engine oil supplied to a cam mechanism for lubrication and cooling is returned to an oil pan. Since an oil return passage is formed for this purpose, in recent years, for the purpose of reducing the size and weight of the engine, it has been proposed to use this oil return passage as a guide hole of an oil level gauge.

[0004]

By the way, in the case where the oil return passage and the guide hole of the oil level gauge are combined, the cam mechanism is already operated after the engine is stopped and the oil supply by the oil pump is cut off. It takes time for the oil supplied to the oil to return to the oil pan through the oil return passage, so during that time, the oil flows through the oil level gauge inserted in the oil return passage that is also the guide hole. Therefore, there is a problem that the oil level cannot be measured without waiting for a while after the engine is stopped.

In view of the above-mentioned problems, the present invention uses the guide hole of the oil level gauge and the oil return passage as a dual purpose to save the space and to reduce the size and weight of the engine. It is an object of the present invention to provide a guide device for an oil level gauge, which can be promptly checked to improve the oil level.

[0006]

A guide device for an oil level gauge according to the present invention for achieving the above object penetrates a cylinder head and a cylinder block of an internal combustion engine, and an upper surface of the cylinder head and a lower part of the cylinder block. A plurality of oil return passages communicating with the inside of an oil pan provided on the cylinder head, and one of the plurality of oil return passages is opened at the upper surface of the cylinder head, and the oil to the openings is opened. An oil inflow limiting member that restricts the inflow of oil is formed, and the oil return passage provided with this oil inflow limiting member serves as a guide hole for the oil level gauge.

In the first oil level gauge guide device, the oil inflow limiting member is formed by a partition wall that sandwiches the opening from both sides in the crankshaft direction of the internal combustion engine and is higher than the upper surface of the cylinder head. Good. Further, in the oil level gauge guide device of the present invention, the oil inflow limiting member may be configured by a partition wall surrounding the opening and higher than the upper surface of the cylinder head.

In the case where the internal combustion engine is a V-type engine, if the guide holes are arranged along the outer wall surfaces of both banks, there is no waste in layout and it is excellent in saving space. As a result, the workability when checking the oil level can be improved.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of an oil level gauge guide device of the present invention will now be described with reference to the drawings. FIG. 1 shows a single bank of a V-type 6-cylinder engine. A cylinder head 3 is fixed to a cylinder block 1 via a gasket 2. A cam carrier 5 that rotatably supports a cam shaft 4 is fixed above the cylinder head 3, and an upper surface of the cam carrier 5 is covered with a head cover 6.

A crankcase 7 is fixed below the cylinder block 1, and an oil pan rail formed on the lower surface of the crankcase 7 is provided with an oil pan 8 for storing engine oil. There is. Then, from the cam carrier 5 to the crankcase 7
A guide hole 9 continuous with the oil level gauge 10 is inserted into the guide hole 9, and the lower end of the oil level gauge 10 is located inside the oil pan 8.

In this engine 11, an oil pump (not shown) is used to pass an oil pan 8 through an oil gallery.
The internal engine oil is supplied to a cam mechanism housed inside the head cover 6 to lubricate and cool the cam mechanism. Excess engine oil flows through the oil return passages 9, 12, 13 shown in FIG. It is configured to be returned to the oil pan 8 via.

In FIG. 2, the right side is the outer wall surface 14
The oil return passages 9, 12, 13 are arranged along the outer wall surface 14 because the position is lower than the left inner wall surface 15 due to the inclination angle of the bank. One of the plurality of oil return passages 9, 12, 13 is
It is used as the guide hole 9 of the oil level gauge 10, and the upper surface of the cylinder head 3 where the guide hole 9 is opened.
An oil inflow limiting member 16 (a portion indicated by a satin finish) that restricts the inflow of oil into the opening is formed in 3a. In FIG. 2, on the lower side of the figure, the bolt boss 18 (portion indicated by satin) of the cylinder head limits the oil inflow, so that the oil inflow limiting member 16 is formed only on the upper side of the figure. As shown in FIG. 5, when there is no bolt boss 18 of the cylinder head that restricts the oil inflow, the opening of the guide hole 9 is sandwiched from both sides in the crankshaft direction of the internal combustion engine, and the upper surface 3a of the cylinder head 3 is more than The oil inflow limiting member 16 which is a high partition wall is formed.

The shape of the oil inflow restricting member 16 is such that the cylinder head 3 can be easily manufactured by aluminum die casting, and has a shape with good die-cutting property, for example, a partition wall perpendicular to the upper surface 3a of the cylinder head 3. It is preferable that the shape is linear when seen in a plan view. Further, as shown in FIG. 1, the opening portion of the guide hole 9 is formed with a guide hole 9 also serving as an oil return passage along the outer wall surface 14 of the cylinder head 3, and the upper portion thereof is formed in the cam carrier 5. It communicates with the guide hole 9, the lower part of which is the cylinder block 1.
It communicates with the guide hole 9 formed in.

An ordinary oil return passage 13 different from the guide hole 9 is constructed as shown in FIG.
The above-described oil inflow limiting member 16 is not provided around the opening opening on the upper surface 3a of the cylinder head 3,
It is formed as a curved surface 17 so that the engine oil can easily flow in, and the other oil return passage 12 has the same shape as this.

Further, as shown in FIGS. 6 and 7, the oil inflow limiting member 16 is formed as a partition wall which surrounds the opening of the guide hole 9 in a circular shape or a U shape and is higher than the upper surface 3a of the cylinder head 3. The guide hole 9 may be opened at a position higher than the upper surface 3a of the cylinder head 3. In this embodiment, one bank of the V-type engine is described as described above, but an oil return passage similar to this is
They are symmetrically provided in the other bank.

With the above structure, when the engine is stopped, the engine oil supplied to the cam mechanism is
It temporarily collects on the upper surface 3a of the cylinder head 3 and is returned to the oil pan 8 via the oil return passages 9, 12, and 13. Then, when the amount of engine oil accumulated on the upper surface 3a of the cylinder head 3 is reduced to some extent and the oil level becomes lower than the height of the oil inflow limiting member 16, the oil formed as the guide hole 9 is formed. The return of the engine oil through the return passage 9 is stopped, and the remaining engine oil passes through the other oil return passages 12 and 13 in which the oil inflow limiting member 16 is not formed and the oil pan 8 Will be returned to.

That is, the engine oil flows into the guide hole 9 from the X direction along the outer wall surface 14 and the Y direction from the center of the cylinder head 3 toward the outer wall surface 14 as shown in FIG. When the upper surface 3a of the cylinder head 3 is inclined, the amount of oil in the Y direction is small and stops in a short time after the engine is stopped, while the amount of oil in the X direction is large and remains until after the flow in the Y direction. It will be. In the embodiment shown in FIGS. 1 to 3 and 5, the flow in the X direction is dammed by the oil inflow limiting member 16 and the bolt boss 18 so that the dammed oil flows into the other oil return passages 12, 13. The oil in the guide hole 9 is well drained.

In the embodiment shown in FIGS. 6 and 7, the partition wall surrounding the opening of the guide hole 9 in a circular shape or a U shape blocks the flow in the X and Y directions to further improve oil drainage. ing. Therefore, the engine oil flowing down through the guide hole 9 is interrupted earlier than in the other oil return passages 12 and 13, so that the oil level check by the oil level gauge 10 can be performed earlier than before. become able to.

The effect of the present invention is more remarkable when applied to a V-type engine or an engine in which the cylinder axis is inclined. However, the present invention is not limited to this, and a series engine or a W-type engine is not limited thereto. May be applied to.

[0020]

The oil level gauge guide device of the present invention penetrates through the cylinder head and the cylinder block of the internal combustion engine, and connects the upper surface of the cylinder head and the inside of the oil pan provided below the cylinder block. And an oil inflow restricting member for restricting the inflow of oil into the opening of one of the plurality of oil return passages that is open to the upper surface of the cylinder head. The oil return passage provided with the oil inflow limiting member serves as a guide hole for the oil level gauge.

Therefore, immediately after the engine is stopped, the engine oil on the upper surface of the cylinder head flows down into the oil pan through all the oil return passages including the guide holes of the oil level gauge, but the oil inflow limiting member is provided. As a result, the flow of engine oil through the guide hole is stopped within a short time, and the rest is returned to the oil pan from another oil return passage. As a result, the oil out of the guide hole is improved, and the waiting time before the measurement with the oil level gauge becomes possible can be shortened.

In addition, the oil inflow restricting member is formed by a partition wall that sandwiches the opening from both sides in the crankshaft direction of the internal combustion engine and is higher than the upper surface of the cylinder head.
When manufacturing the cylinder head by aluminum die casting,
The shape can be easily removed. Further, the oil inflow limiting member is configured by a partition wall surrounding the opening and higher than the upper surface of the cylinder head.
The oil flow from the Y direction in FIG. 2 can also be restricted to prevent oil from running out, and the range in which the oil inflow restriction member is provided can be restricted to a narrow range around the opening.

Further, when the internal combustion engine is a V-type engine and the guide holes are arranged along the outer wall surfaces of both banks, there is no waste in layout and it is effective in saving space. Also, workability at the time of oil level check can be improved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a guide device for an oil level gauge according to an embodiment of the present invention.

FIG. 2 is a plan view of a guide device for the oil level gauge shown in FIG.

FIG. 3 is an enlarged cross-sectional view taken along the line AA of the guide hole shown in FIG.

FIG. 4 is an enlarged cross-sectional view of the oil return passage shown in FIG. 2 taken along the line BB.

FIG. 5 is a plan view showing another embodiment of the oil inflow limiting member.

FIG. 6 is a plan view showing another embodiment of the oil inflow limiting member.

7 is an enlarged cross-sectional view of the guide hole shown in FIG. 6 taken along the line AA.

[Explanation of symbols]

1 Cylinder Block 3 Cylinder Head 3a Upper Surface 8 Oil Pan 9 Oil Return Passage (Guide Hole) 10 Oil Level Gauge 11 Internal Combustion Engine (Engine) 12 Oil Return Passage 13 Oil Return Passage 14 Outer Wall Surface 16 Oil Inflow Limiting Member 18 Bolt Boss

Claims (4)

[Claims] 1. A plurality of oil return passages are formed which penetrate a cylinder head and a cylinder block of an internal combustion engine and connect an upper surface of the cylinder head and an inside of an oil pan provided below the cylinder block. An oil inflow limiting member that restricts the inflow of oil into the opening is formed in a portion of one of the oil return passages that opens on the upper surface of the cylinder head. An oil level gauge guide device that uses the return passage as a guide hole for the oil level gauge. 2. The oil level gauge guide device according to claim 1, wherein the oil inflow limiting member is a partition wall that sandwiches the opening from both sides in the crankshaft direction of the internal combustion engine and is higher than the upper surface of the cylinder head. 3. The oil level gauge guide device according to claim 1, wherein the oil inflow limiting member is a partition wall that surrounds the opening and is higher than an upper surface of the cylinder head. 4. The oil level gauge guide according to claim 1, wherein the internal combustion engine is a V-type engine, and the plurality of oil return passages are arranged along outer wall surfaces of both banks. apparatus.