JPH0932526A - Oil pump sprocket cover of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance lubricating performance of an oil pump and reliability of an internal combustion engine by arranging a bracket to flow down oil to an oil pan after aeration of the oil is reduced by receiving the oil flowing out of a clearance part between an oil pump sprocket cover and an oil pump. SOLUTION: An oil pump sprocket cover 24 to surround a part of this oil pump sprocket 20 is arranged in the vicinity of the oil pump sprocket 20 in order to prevent agitation of oil in an oil pan. The oil pump sprocket cover 24 and an oil pump 18 are fixed under a clearance 26 part between this oil pump sprocket cover 24 and the oil pump 18, and a bracket 28 is arranged to flow down the oil to the oil pan after aeration of the oil is reduced by receiving the oil flowing out of its clearance 26 part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil pump sprocket cover for an internal combustion engine, and more particularly to an oil pump sprocket cover for an internal combustion engine that reduces aeration of oil flowing out from a gap between the oil pump sprocket cover and the oil pump.

[0002]

2. Description of the Related Art In an internal combustion engine mounted on a vehicle, oil is circulated by an oil pump for lubrication and cooling of various parts of the engine. Oil is stored in an oil pan below the internal combustion engine, is supplied to various parts of the engine, lubricates and cools various parts of the internal combustion engine, and is returned to the oil pan.

An oil pump sprocket cover for an internal combustion engine is disclosed in Japanese Patent Publication No. 63-16569. The sprocket cover for an oil pump disclosed in this publication is a sprocket attached to a flange portion formed on a side wall on the sprocket arrangement side of the oil pump body so as to surround a sprocket attached to a drive shaft extending from the oil pump body. A cover, having at least an upper edge located above the maximum level of oil and a plurality of elongated holes formed along an imaginary circle, each of the elongated holes extending in the circumferential direction of the imaginary circle, A wall portion that is attached to the end surface of the flange portion by passing a bolt through each of the long holes and a guide portion that is arranged along the drive chain over a range from the sprocket on the sprocket entry side of the drive chain that is hung on the sprocket are integrated. And wear-resistant elastic material is attached to the guide part to constantly contact the drive chain By applying tension to the drive chain, the drive sprocket of the oil pump placed in the oil was hung on the drive sprocket without agitating, splashing, or wavy oil surface during the rotation. It also prevents the drive chain from sagging.

Further, there is one disclosed in Japanese Patent Laid-Open No. 5-332113. The mounting structure of the oil pump disclosed in this publication disposes the oil pump in the oil pan, and at the same time installs one of the pump sprockets near the pump sprocket to prevent the oil in the oil pan from being agitated when the oil pump is driven. Providing a cover part that surrounds the part,
It prevents the oil suction failure at low temperature and prevents the oil from being stirred by the pump sprocket and the pump driving chain.

[0005]

In the conventional internal combustion engine, as shown in FIG. 10, an oil pan 112 is attached to the lower portion of the crankcase 110 of the internal combustion engine 102, and an oil pump 118 is installed in the oil pan 112. It is arranged.

The oil pump sprocket 120 of the oil pump 118 is attached to the oil pump chain 12
2 is wound and the oil pump 118 is driven through the oil pump chain 122 by the driving force of the crankshaft 114.

An oil pump sprocket cover 124 mounted on the crankcase 110 is provided near the oil pump sprocket 120. The oil pump sprocket cover 124 and the oil pump 11 are provided.
A gap 126 is exposed between the eight.

The oil in the oil pump sprocket cover 124 directly flows into the oil pan 112 through the gap 126.

As a result, a large amount of aeration oil in the oil pump sprocket cover flows out directly into the oil pan, and the aeration in the oil sucked by the oil strainer arranged in the oil pan becomes large. There is a risk of causing defects, and the lubricating performance of the oil pump that pressure-feeds the sucked oil is reduced, which reduces the reliability of the internal combustion engine.

Further, when the lubrication performance of the oil pump is lowered, the parts to be lubricated are greatly worn, the service life of each part is shortened, the replacement frequency is increased, the cost is increased, and it is economically disadvantageous. There was an inconvenience that

[0011]

Therefore, in order to eliminate the above-mentioned inconvenience, the present invention connects an oil pump drive sprocket and an oil pump sprocket fixed to the end of the crankshaft by a drive chain. In an oil pump sprocket cover of an internal combustion engine, which is provided with an oil pump driven by the rotational force of the crankshaft, and which is provided with an oil pump sprocket cover surrounding the oil pump sprocket of this oil pump, between the oil pump sprocket cover and the oil pump. A bracket for fixing the oil pump sprocket cover and the oil pump to the bottom of the gap portion and receiving the oil flowing out from the gap portion to reduce the aeration of the oil and then flowing the oil down to the oil pan is provided. .

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION
When the oil flows out from the gap between the oil pump sprocket cover and the oil pump, the bracket receives the oil to reduce the aeration of the oil, and then the oil flows down to the oil pan.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

1 to 9 show an embodiment of the present invention. In FIG. 3, 2 is an internal combustion engine and 4 is a cylinder block. The internal combustion engine 2 includes a cylinder block 4
A cylinder head 6 and a cylinder head cover 8 are fixedly provided on the upper side.

The upper surface of the crankcase 10 is attached to the lower surface of the cylinder block 4. An oil pan 12 is attached to a lower edge portion of the crankcase 10.

The crankshaft 1 is provided between the lower surface of the cylinder block 4 and the upper surface of the crankcase 10.
4 is pivotally supported. The crankshaft 14 is arranged from one end surface side (left side in FIG. 3) of the internal combustion engine 2 toward the other end surface side (right side in FIG. 3).

Further, an oil pump driving sprocket 16 is attached to one end portion (left side in FIG. 3) of the crankshaft 14.

Furthermore, the oil pump 18 is arranged in the oil pan 12, and the oil pump sprocket 20 of the oil pump 18 is attached to the oil pump chain 2.
2 is provided by winding the oil pump 18 through the oil pump chain 22 by the driving force of the crankshaft 14.
An oil pump sprocket cover 24 that surrounds a part of the oil pump sprocket 20 is provided near the oil pump sprocket 20 in order to prevent the oil in the oil pan 12 from being agitated when the oil pump 12 is driven.

Below the gap 26 between the oil pump sprocket cover 24 and the oil pump 18,
Oil pump sprocket cover 24 and oil pump 1
8 is fixed, and brackets 28 are provided for receiving the oil flowing out from the gap 26 and reducing the aeration of the oil and then allowing the oil to flow down to the oil pan 12.

More specifically, as shown in FIG. 1, one end of the bracket 28 has an oil pump sprocket cover 2
4 a curved end portion 3 which is fixed to the lower portion and the other end of which exposes a gap 26 of the oil pump sprocket cover 24.
0 extends from the lower side to the oil pump 18 side, and the oil pump 1
It is fixed to the lower part of 8 by a fixing bolt 32.

The oil pump sprocket cover 24 is formed in a U-shaped cross section so as to surround a part of the oil pump sprocket 20, and one end of the oil pump sprocket cover 24 is fixed to the crankcase 10. One end of a bracket 28 is fixed to the lower surface of the cover 24. Therefore, the bracket 28
Also functions as a support member for fixing the oil pump sprocket cover 24 to the oil pump 18.

Reference numeral 34 is an oil strainer arranged in the oil pan 12, and 36 is an oil strainer 3.
Reference numeral 4 denotes an oil suction pipe communicating with the oil pump 18, and reference numeral 38 denotes an oil suction port portion of the oil strainer 34.

Next, the operation will be described.

When the crankshaft 14 rotates,
The oil pump sprocket 20 fixed to the crankshaft 14 rotates, and the oil pump sprocket 2
The oil pump 18 is driven by rotating the oil pump sprocket 20 via the oil pump chain 22 with the rotational force of 0.

At this time, since the oil pump sprocket cover 24 surrounds a part of the oil pump sprocket 20, the oil pump sprocket 20 is
The oil in the oil pan 12 is prevented from being stirred by the oil pump chain 22 and the oil pump chain 22.

Further, the oil pump sprocket cover 2
The oil that has entered the inside of the space 4 will be left in the gap 2 by the rotation of the oil pump chain 22 and the oil pump sprocket 20.
The oil flows out from the six parts to the outside part of the oil pump sprocket cover 24 and reaches the inside of the bracket 28.

The bracket 28 temporarily receives the oil flowing out from the gap 26, that is, after the one cushion is placed to allow the oil to flow down, and after reducing the aeration of the oil in the bracket 28,
Oil is flowing down to the oil pan 12.

As a result, the bracket 28 can be provided with a function of fixing the oil pump sprocket cover 24 and the oil pump 18 and a function of temporarily blocking the flow of oil flowing out from the gap 26. It is practically advantageous.

The bracket 28 receives the oil flowing out from the gap 26 between the oil pump 18 and the oil pump sprocket cover 24, and the bracket 28 reduces the aeration of the oil.
By causing the oil to flow down to the oil pan 12, it is possible to reduce aeration in the oil when the oil is sucked by the oil strainer 34, and it is possible to improve the lubrication condition of the entire internal combustion engine 2 and improve the reliability. Can contribute to.

Further, since the aeration in the oil can be reduced, the lubrication performance of the oil pump 18 can be enhanced, the wear of the lubricated portion can be prevented, and the service life of each component can be extended. Since the replacement frequency is low, the cost can be reduced, which is economically advantageous.

The present invention is not limited to the above-mentioned embodiments, but various application modifications are possible.

For example, in the embodiment of the present invention, when the bracket is formed, one end is fixed to the lower surface of the oil pump sprocket cover having a U-shaped cross section and the other end is fixed to the lower part of the oil pump. Although it is configured to be fixed by bolts, it is sufficient that the bracket is arranged below the gap portion between the oil pump sprocket cover and the oil pump and can receive the oil flowing out from the gap portion. It is possible to change the mounting portion and the mounting structure of the device as desired.

[0033]

As described above in detail, according to the present invention, the oil pump drive sprocket and the oil pump sprocket fixed to the end portion of the crankshaft are connected by the drive chain, and the rotational force of the crankshaft is used. An oil pump sprocket cover for an internal combustion engine that has a driven oil pump and an oil pump sprocket cover that surrounds the oil pump sprocket of the oil pump.In an oil pump sprocket cover below the gap between the oil pump sprocket cover and the oil pump, Since a bracket was provided to fix the cover and the oil pump and receive the oil flowing out from the gap area to reduce the aeration of the oil and then let the oil flow down to the oil pan. A function for fixing the-pumped, can be added and a function of blocking the flow of oil flowing out from the gap site temporarily, it is practically advantageous. Further, the bracket receives the oil that has flowed out from the gap between the oil pump and the oil pump sprocket cover,
After reducing the aeration of oil with this bracket, let the oil flow down to the oil pan,
Aeration in the oil when the oil is sucked by the oil strainer can be reduced, the lubrication condition of the entire internal combustion engine can be improved, and the reliability can be improved. Furthermore, by reducing the aeration in the oil, it is possible to improve the lubrication performance of the oil pump, prevent wear of the lubricated parts, and prolong the service life of each part. The frequency is low and the cost can be low, which is economically advantageous.

[Brief description of drawings]

FIG. 1 is a schematic enlarged sectional front view of an oil pump sprocket cover and an oil pump showing an embodiment of the present invention.

FIG. 2 is a schematic enlarged sectional plan view of an oil pump sprocket cover and an oil pump.

FIG. 3 is a schematic sectional view of an internal combustion engine.

FIG. 4 is an enlarged front view of an oil pump sprocket cover and a bracket.

FIG. 5 is an enlarged plan view of an oil pump sprocket cover and a bracket.

FIG. 6 is an enlarged bottom view of an oil pump sprocket cover and a bracket.

FIG. 7 is an enlarged rear view of an oil pump sprocket cover and a bracket.

FIG. 8 is a cross-sectional view taken along the line V〓-V〓 of FIG.

FIG. 9 is a cross-sectional view taken along line 〓X-〓X of FIG. 8;

FIG. 10 is a schematic enlarged view of an oil pump sprocket cover part showing a conventional technique of the present invention.

[Explanation of symbols]

 2 Internal Combustion Engine 4 Cylinder Block 6 Cylinder Head 8 Cylinder Head Cover 10 Crank Case 12 Oil Pan 14 Crank Shaft 16 Oil Pump Drive Sprocket 18 Oil Pump 20 Oil Pump Sprocket 22 Oil Pump Chain 24 Oil Pump Sprocket Cover 26 Gap 28 Bracket 30 Curved End Part 32 Fixing bolt 34 Oil strainer

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[Procedure amendment]

[Submission date] August 24, 1995

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

[Fig. 2]

[Figure 3]

FIG. 4

[Figure 5]

[Figure 8]

FIG. 6

FIG. 7

[Figure 9]

FIG. 10

Claims (1)

[Claims] 1. An oil pump driven by the rotational force of the crankshaft, wherein an oil pump driving sprocket fixed to the end of the crankshaft and an oil pump sprocket are connected by a drive chain.
In an oil pump sprocket cover for an internal combustion engine provided with an oil pump sprocket cover that surrounds the oil pump sprocket of this oil pump, an oil pump sprocket cover and an oil pump are installed below the gap between the oil pump sprocket cover and the oil pump. An oil pump sprocket cover for an internal combustion engine, comprising a bracket which is fixed and receives oil flowing out from the gap portion to reduce oil aeration and then causes the oil to flow down to an oil pan.