JPH08158846A - Oil pan structure for internal combustion engine - Google Patents

Abstract

PURPOSE: To suppress generation of aeration by providing a partition wall which extends from a bottom surface of an oil pan to a portion near an oil pump case, and determining an oil pump chain chamber in the oil pan by means of the partition wall and the oil pump case. CONSTITUTION: A partition wall is integrated with an oil pan 12, at a front portion of an internal combustion engine in the oil pan 12, which wall extends from a bottom surface of the oil pan 12 to a portion near an oil pump case 72 of an oil pump 52 in a ribbed manner. A small clearance S is formed between the partition wall 74 and the oil pump case 72. In torque transmission from a crank shaft, lubricating oil in an oil pump chain chamber 76 is stirred by an oil pump sproket 54 and a fourth timing chain 56. The oil pump chain chamber 76 is partitioned from the oil pan 12 with a small clearance S by means of the oil pump case 72 and the ribbed partition wall 74, so that oscillation of the lubricating oil in the pump chamber 76 is not transmitted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil pan structure of an internal combustion engine, and more particularly to an oil pump chain chamber that encloses an oil pump sprocket and an oil pump chain of an oil pump by a partition wall and an oil pump case. The present invention relates to an oil pan structure for an internal combustion engine, which is formed in the inside of the oil pan and suppresses aeration of lubricating oil in the oil pan when the internal combustion engine is driven to improve lubrication performance.

[0002]

2. Description of the Related Art In an internal combustion engine, a cylinder head is mounted on a cylinder block, one crankshaft is axially supported by a bearing cap, and an oil pan is attached to the lower surface.

Lubricating oil is contained in the oil pan and is pumped to the lubricated portion of the internal combustion engine by an oil pump.

As the oil pan structure of the internal combustion engine,
There is one disclosed in Japanese Utility Model Publication No. 1-157214. The engine lubricating oil sump partition structure disclosed in this publication has an oil pump driven by a crankshaft via a transmission mechanism positioned in the lower lubricating oil sump of the engine and integrated with a rotating body protruding from the casing of the oil pump. The shield is integrally raised from the pump casing so as to cover the side of the driven rotating body, and the cover is detachably and oil-tightly attached to the shield.

Further, there is one disclosed in Japanese Utility Model Laid-Open No. 4-37820. The engine oil pan disclosed in this publication has a compartment in which an upper end of the oil pan is defined by a partition wall located at a higher position than the regular oil surface in the oil pan. Is driven in association with the crankshaft of the engine and a part of the outer circumference thereof accommodates a gear for driving an oil pump located below the regular oil level.

[0006]

In the conventional oil pan structure for an internal combustion engine, the internal combustion engine 102 includes a cylinder block 104, a cylinder head 6 mounted on the cylinder block 104, as shown in FIG. One crankshaft 110 axially supported in the cylinder block 104 by a bearing cap (not shown)
And an oil pan 112 attached to the lower surface of the cylinder block 104.

An oil pump 152 is arranged in the oil pan 112, and an oil pump sprocket 154 of the oil pump 152 and the crankshaft 110 are connected by an oil pump chain 156.

Further, the oil pan 112 comprises an upper portion 166 and a lower portion 168, and the upper portion 16
6, that is, the oil pump 152 is arranged on the front side (left side in FIG. 7) of the internal combustion engine 102,
An oil strainer 170 is provided in the lower portion 168, that is, on the rear side (right side in FIG. 7) of the internal combustion engine 2, and the oil strainer 170 is connected to the oil pump 152.

At this time, the oil pump sprocket 154 and the oil pump chain 156 are immersed in the lubricating oil contained in the oil pan 112, that is, a part of the oil pump sprocket 154 and the oil pump chain 156. Is below the oil level F of the lubricating oil.

As a result, when the internal combustion engine is driven, the rotational force from the crankshaft is transmitted to the oil pump sprocket of the oil pump via the oil pump chain, and when the rotational force is transmitted, the oil pump The chain and the oil pump sprocket scrape up the lubricating oil, aeration occurs in the lubricating oil in the oil pan, and the lubricating performance deteriorates, which is disadvantageous in practical use.

[0011]

Therefore, in order to eliminate the above-mentioned inconvenience, the present invention provides a crank sprocket and an oil pump sprocket mounted on a crank shaft axially supported by a cylinder block of an internal combustion engine. An oil pump for transmitting the rotation of the crankshaft to the oil pump sprocket by the oil pump chain and driving the oil pump, and an oil pan attached to the lower surface of the cylinder block to surround the oil pump. In the bread structure,
An oil pump is provided that has a partition wall portion extending from the bottom surface in the oil pan to the vicinity of the oil pump case of the oil pump, and is partitioned by the partition wall portion and the oil pump case to surround the oil pump sprocket and the oil pump chain of the oil pump. A chain chamber is provided inside the oil pan.

[0012]

According to the invention as described above, when the internal combustion engine is driven, the partition wall partitioning the oil pump chain chamber and the oil pan suppresses the occurrence of aeration in the lubricating oil in the oil pan, thereby improving the lubricating performance. Is improving.

[0013]

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

1 to 6 show an embodiment of the present invention. 2 and 3, 2 is an internal combustion engine, for example, a 6-cylinder V-type internal combustion engine, 4 is a cylinder block, 6-
1, 6-2 are the first and second cylinder heads, 8-1, 8-
Reference numeral 2 is the first and second cylinder banks.

In the V-type internal combustion engine 2, the first and second cylinder heads 6-1 and 6-2 are mounted on the cylinder block 4, and the first and second cylinder banks 8-1 and 8 are substantially V-shaped. −
2 are arranged.

On the cylinder block 4, one crankshaft 10 is axially supported by a bearing cap (not shown) in the longitudinal direction, and an oil pan 12 is attached to the lower surface. Three first cylinders 14-1, 14-2, 14-3 are provided on one side of the cylinder block 4, and three second cylinders 16-1, 16-2, 16- are also provided on the other side.
3 (note that the second cylinders 16-2 and 16-3 are not shown), and these first cylinders 14-1 and 14- are provided.
Two first pistons 18-1, 18- in 2, 14-3
2, 18-3 are respectively arranged, and three second pistons 20-1, 20-2, 20-3 are respectively arranged in the second cylinders 16-1, 16-2, 16-3. (The second pistons 20-2 and 20-3 are not shown). Then, the first and second pistons 18-1, 18-2, 18-
3, 20-1, 20-2, 20-3 are the first and second connecting rods 22-1, 22-2, 22-3, 24-.
1, 24-2, 24-3 communicate with the crankshaft 10 (note that the second connecting rod 24-2,
24-3 is not shown. ).

A crank sprocket 26 is attached to one end of the crankshaft 10.

Further, for the exhaust valve for opening and closing the first cam shaft 32 for the intake valve for opening and closing the intake valve 30 and the exhaust valve (not shown) in the first head cover 28-1 of the first cylinder head 6-1. The first cam shaft 34 is disposed respectively, and the second head cover 28-2 of the second cylinder head 6-2 includes an intake valve second cam shaft 38 for opening and closing the intake valve 36 and an exhaust valve 40. An exhaust valve second cam shaft 42 that opens and closes is provided respectively.

Then, the first and second cylinder heads 6
The intake valve first and second camshafts 32 and 38 are respectively located on the side of the space 44 sandwiched by -1 and 6-2.

Further, a small-diameter sprocket (not shown) is arranged at one end of each of the intake valve first cam shaft 32 and the exhaust valve first cam shaft 34.

A large-diameter sprocket (not shown) and a small-diameter sprocket (not shown) having the same shape as the small-diameter sprocket are arranged at one end of the intake valve second cam shaft 38, and one end of the exhaust-valve second cam shaft 42 is provided. Also, a small diameter sprocket (not shown) is provided.

An intermediate shaft (not shown) is provided between the crankshaft 10 and the two intake valve first cam shafts 32 and exhaust valve first cam shafts 34 of the first cylinder head 6-1. A large-diameter sprocket and a small-diameter sprocket (not shown) are arranged at one end of the intermediate shaft.

The large diameter sprocket of the intake valve second cam shaft 38 of the second cylinder head 6-2, the large diameter sprocket of the intermediate shaft, and the crank sprocket 26 of the crankshaft 10 are connected by the first timing chain 46. Set up.

The small diameter sprockets of the two intake valve first cam shafts 32 and the exhaust valve first cam shaft 34 of the first cylinder head 6-1 and the intermediate shaft small diameter sprockets are connected to the second timing chain 48. Contact us to establish.

Further, the small-diameter sprockets of the two intake valve second cam shafts 38 and exhaust valve second cam shafts 42 arranged in the second cylinder head 6-2 are connected by a third timing chain 50. Set up.

Further, the crankshaft 10 and the oil pump sprocket 54 of the oil pump 52 are connected by a fourth timing chain 56.

The first to fourth timing chains 46, 48, 50 and 56 are covered with a timing chain cover 58 as shown in FIG.

A water pump 60 is provided between the cylinder block 4 of the V-type internal combustion engine 2 and the timing chain cover 58 and at a position offset toward the second cylinder head 6-2 side, and the crankshaft 10 is provided with a crank pulley. 6
2, the water pump 60 is provided with a water pump pulley (not shown), and the crank pulley 62 and the water pump pulley are wound around the drive belt 64.

The oil pan 12 is, as shown in FIG.
It is composed of an upper portion 66 and a lower portion 68, and the oil pump 52 is arranged in the upper portion 66, that is, in front of the V-type internal combustion engine 2 (left side in FIG. 2), and in the lower portion 68, that is, the V portion. An oil strainer 70 is arranged on the rear side (right side in FIG. 2) of the internal combustion engine 2 and is connected to the oil pump case 72 of the oil pump 52.

Further, a partition wall portion 74 extending from the bottom surface in the oil pan 12 to the vicinity of the oil pump case 72 of the oil pump 52 is provided, and the oil pump 52 is partitioned by the partition wall portion 74 and the oil pump case 72.
The oil pump chain chamber 76 surrounding the oil pump sprocket 54 and the fourth timing chain 56, which is an oil pump chain, is provided in the oil pan 12.

More specifically, in the front portion (left side in FIG. 1) of the V-type internal combustion engine 2 in the oil pan 12,
A partition wall portion 74 extending in a rib shape from the bottom surface of the oil pan 12 to the vicinity of the oil pump case 72 of the oil pump 52.
Is integrally formed with the oil pan 12, and a small gap S is formed between the partition wall portion 74 and the oil pump case 72.

The chain chamber 76 is formed on the left side (lower side in FIG. 4) of the V-type internal combustion engine 2, and the partition wall portion 74 is formed on the outer shape of the oil pump case 72 as shown in FIG. It is formed in a shape that follows.

Reference numeral F is an oil level of the lubricating oil contained in the oil pan 12, 78 is an oil level gauge, and 80 is an oil filter.

Next, the operation will be described.

When the V-type internal combustion engine 2 is driven, the rotational force from the crankshaft 10 is applied by the fourth timing chain 56 to the oil pump sprocket 5 of the oil pump 52.
4 to drive the oil pump 52.

When the rotational force is transmitted from the crankshaft 10, the oil pump sprocket 54 and the fourth timing chain 56 scrape up the lubricating oil in the oil pump chain chamber 76.

At this time, the oil pump chain chamber 76 and the inside of the oil pan 12 are partitioned by the oil pump case 72 of the oil pump 52 and the rib-like partition wall portion 74 with a small clearance S. As a result, the vibration of the lubricating oil in the oil pump chain chamber 76 is not propagated.

As a result, the oil pump case 72 is
The partition chamber 74 formed up to the vicinity causes the chain chamber 76 to
Type internal combustion engine 2 can be formed on the left side (lower side in FIG. 4) part, and the material can be reduced compared to the conventional one.
It can be made light and compact.

Further, by integrally forming the partition wall portion 74 with the oil pan 12, there is no fear of complicating the structure, the manufacturing is easy, the cost can be reduced, and it is economically advantageous.

Further, when the V-type internal combustion engine 2 is driven, even if the oil pump sprocket 54 and the fourth timing chain 56 scrape up the lubricating oil in the chain chamber 76, the partition wall 74 causes the oil pump. The oil chain chamber 76 and the oil pan 12 are partitioned with a small clearance S, and there is no fear that the vibration of the lubricating oil in the oil pump chain chamber 76 may be propagated. It is possible to suppress the occurrence of aeration in the inside 12, and to improve the lubricating performance of the V-type internal combustion engine.

Further, by forming the oil pump chain chamber 76 in the oil pan 12, the rib shape of the partition wall portion 74 partitioning the chain chamber 76 can improve the rigidity and strength of the oil pan. It is practically advantageous.

Further, since the shape of the oil pump chain chamber 76 is not complicated, the flow of molten metal during the casting operation becomes good, and the castability is excellent.

[0043]

As described in detail above, according to the present invention, the crank sprocket and the oil pump sprocket mounted on the crankshaft pivotally supported by the cylinder block of the internal combustion engine are connected to each other through the oil pump chain. An oil pump that transmits the rotation of the crankshaft to the oil pump sprocket by the oil pump chain is installed, and from the bottom of the oil pan installed on the lower surface of the cylinder block to surround the oil pump to the vicinity of the oil pump case of the oil pump. Since an extending partition wall is provided and an oil pump chain chamber that is partitioned by the partition wall and the oil pump case and surrounds the oil pump sprocket and the oil pump chain of the oil pump is provided in the oil pan, it is formed up to the vicinity of the oil pump case. Due to the partition wall Thien chamber oil pump can be formed at one side portion of the engine Te, compared with the conventional, mitigation materials Hakare may weight and size. Further, when the internal combustion engine is driven, even if the oil pump sprocket and the oil pump chain scrape up the lubricating oil in the chain chamber, the partition wall section separates the oil pump chain chamber from the oil pan. Therefore, the fluctuation of the lubricating oil in the oil pump chain chamber is not likely to be propagated, aeration in the oil pan can be suppressed, and the lubricating performance of the internal combustion engine can be improved. Further, by forming the oil pump chain chamber in the oil pan, the partition wall partitioning the chain can improve the rigidity and strength of the oil pan, which is practically advantageous. Furthermore, since the shape of the oil pump chain chamber is not complicated, there is an effect that the flow of molten metal during the casting operation is good and the castability is excellent.

[Brief description of drawings]

FIG. 1 is a schematic enlarged sectional view of an oil pan portion of an oil pan structure of an internal combustion engine showing an embodiment of the present invention.

FIG. 2 is a schematic sectional view showing an oil pan structure of an internal combustion engine.

FIG. 3 is a schematic sectional view showing a V-shape of the internal combustion engine.

FIG. 4 is a plan view of an oil pan.

5 is an enlarged cross-sectional view taken along the line VV of FIG.

FIG. 6 is a bottom view of the oil pan.

FIG. 7 is a schematic cross-sectional view showing an oil pan structure of an internal combustion engine according to the prior art of the present invention.

[Explanation of symbols]

 2 V type internal combustion engine 4 Cylinder block 6-1, 6-2 1st, 2nd cylinder head 8-1, 8-2 1st, 2nd cylinder bank 10 Crankshaft 12 Oil pan 26 Crank sprocket 28-1 1st Head cover 28-2 Second head cover 32 Intake valve first cam shaft 34 Exhaust valve first cam shaft 38 Intake valve second cam shaft 42 Exhaust valve second cam shaft 46 First timing chain 48 Second timing chain 50 Third timing chain 52 Oil pump 54 Oil pump sprocket 56 Fourth timing chain 58 Timing chain cover 60 Water pump 62 Crank pulley 64 Drive belt 66 Upper part 68 Lower part 70 Oil strainer 72 Oil pump case 74 Partition wall part 76 Oil pump chain Muro 78 Oil Level Gauge 80 oil filter S interstitial F oil level

Claims (1)

[Claims] 1. A crank sprocket mounted on a crank shaft axially supported by a cylinder block of an internal combustion engine and an oil pump sprocket are connected to each other via an oil pump chain to rotate the crank shaft by an oil pump sprocket. In an oil pan structure of an internal combustion engine in which an oil pump for transmitting and driving the oil pump is provided and an oil pan is attached to a lower surface of the cylinder block so as to surround the oil pump, an oil pump case of the oil pump from a bottom surface of the oil pan A partition wall portion that extends to the vicinity is provided, and an oil pump chain chamber that is partitioned by the partition wall portion and the oil pump case and that surrounds the oil pump sprocket and the oil pump chain of the oil pump is provided in the oil pan. Internal combustion The oil pan structure of the engine.