JPH07166833A - Engine oil pan device - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the oil splashes scattered by the crankshaft and connecting rod and scattered in the crank chamber from flowing into the intake system together with blow-by gas and reducing the amount of oil in the oil pan. [Structure] An oil sump portion 7 for accumulating oil sucked up by an oil pump and a high bottom portion 8 for allowing oil after lubricating each engine portion to flow down to the oil sump portion are provided.
In an oil pan device for an engine in which is arranged close to the rotation system of the crankshaft 23, the inlet portions 25, 2 located at the high bottom portion 8 and facing in the rotational movement direction of the crankshaft.
6, the oil return passages 21, 2 communicating with the oil reservoir 7
2 is provided, and the oil return passage is formed in the shape of a pipe line with its upper part closed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil pan device for storing engine lubricating oil.

[0002]

2. Description of the Related Art As an oil pan device provided in a conventional automobile engine, there are those shown in FIGS. 8 and 9, respectively. (See Japanese Examined Patent Publication No. 53-16048). To explain this, the oil pan 51 has an oil reservoir 52 for storing the oil sucked up by an oil pump.
And a high-bottom portion 53 that allows the oil after lubricating each part of the engine to flow down to the oil sump portion 52 is provided, and the high-bottom portion 53 is arranged close to the rotation system of the crankshaft 54 due to restrictions on the vehicle on which the engine 50 is mounted. ing.

When viewed in the rotational movement direction of the crankshaft 54 of the high-bottom portion 53, a plurality of ribs 56 curved in an arc are juxtaposed side by side on the side where the rotating portion approaches the high-bottom portion 53, and a linear rib is provided on the opposite side. 57 extends obliquely over almost the entire length of the high bottom portion 53.

The oil flowing down the high bottom portion 53 is agitated by the crankshaft 54 and the connecting rod 55, and the agitated oil flow is directed to the oil reservoir 52 by the ribs 56 and 57. It is designed to accelerate the flow of oil.

[0005]

However, in the case of such a conventional apparatus, since the upper portions of the ribs 56 and 57 are not closed, the flow direction of oil in the high bottom portion 53 cannot be sufficiently controlled. There is a problem in that the amount of oil splashes scattered by the crankshaft 54 and the connecting rod 55 into the crank chamber 58 increases, and the amount of oil consumption taken away together with the blow-by gas recovered from the crank chamber 58 into the intake system increases. It was

The present invention aims to solve these conventional problems.

[0007]

The invention according to claim 1 is provided with an oil sump portion for accumulating oil sucked up by an oil pump, and a high bottom portion for allowing oil after lubricating each engine portion to flow down to this oil sump portion. In an oil pan device for an engine in which the high-bottom portion is arranged close to a rotation system of a crankshaft, the oil-pan device has an inlet portion located at the high-bottom portion and facing the rotational movement direction of the crankshaft. An oil return passage communicating with the oil return passage was provided, and the oil return passage was formed in a pipe line shape with an upper part closed.

According to a second aspect of the present invention, in the first aspect of the present invention, a plurality of inlets are opened at the high bottom, and the oils from the plurality of inlets are combined and flowed into the oil sump.

According to a third aspect of the invention, in the second aspect of the invention, a partition wall is provided between the plurality of openings to branch the oil return passage toward the downstream side over a predetermined length.

According to a fourth aspect of the invention, in each of the above inventions,
The ceiling portion of the oil return passage is formed so as to increase the inclination toward the oil reservoir portion in the downstream portion of the oil return passage and to allow the oil to flow in substantially downward.

According to a fifth aspect of the invention, in each of the above inventions,
The oil sump is connected to the high-bottom space by the oil return passage, and the upper part thereof is defined by a baffle plate.

According to a sixth aspect of the invention, in each of the above inventions,
It is assumed that the oil return passage is provided on the flatly formed high bottom portion and only on the downstream side in the turning direction of the crankshaft.

[0013]

In the first aspect of the invention, the oil in the high bottom portion is given a flow in the lateral direction (rotational direction) of the engine by the stirring of the crankshaft and the connecting rod, and the inlet portion of the oil return passage opposes this flow direction. Thus, the oil at the high bottom is quickly returned to the oil reservoir through the oil return passage. The oil return passage is formed in the shape of a pipe line with its upper part blocked, so that the oil scraped up by the crankshaft and connecting rod must be reliably captured by the ceiling of the oil return passage and scattered into the crank chamber. There is no.

According to the second aspect of the present invention, while the oil is efficiently captured by the plurality of inlet portions, the inflow portion of the oil from the oil return passage to the oil reservoir portion can be concentrated at an appropriate place.

According to the third aspect of the present invention, the inflow oil from the upstream and downstream inlets does not interfere with each other in the oil return passage, that is, the oil flows from the upstream inlet into the oil return passage. It is possible to prevent a phenomenon in which the oil heading to the oil reservoir collides with the oil flowing in from the downstream side and is pushed up again to the upstream side.

According to the fourth aspect of the invention, the return oil to the oil sump portion does not concentrate at a certain position due to the inclination, that is, it does not spread over a wide range of the oil sump portion.

According to the fifth aspect of the present invention, the baffle plate suppresses the swaying of the return oil, so that the return oil does not flow back or scatter from the upper part of the oil reservoir to the high bottom part again. .

According to the invention of claim 6, the structure of the oil pan is simplified and a large internal space of the oil pan is secured.

[0019]

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

As shown in FIGS. 1, 2 and 3, respectively,
A skirt portion 2S of the cylinder block 2 provided in the four-cylinder engine 1 has an upper oil pan 3 made of cast aluminum,
The lower oil pan 4 made of sheet metal is connected to the lower part of the lower oil pan 4 through a plurality of bolts 5 and 6, respectively.
The oil stored therein is sucked up by an oil pump (not shown) to lubricate each part of the engine 1, and then returns to the upper oil pan 3 and the lower oil pan 4 again.

The lower oil pan 4 defines an oil sump 7 having a predetermined volume necessary for storing oil, while the upper oil pan 3 has a high bottom 8 for allowing oil to flow down to the oil sump 7. Form.

A baffle plate 11 is provided above the oil reservoir 7.
The baffle plate 11 has a plurality of slits 12 and an opening 13 for inserting an oil strainer (not shown) formed in the baffle plate 11. The oil strainer is exposed on the oil surface by suppressing shaking and vibration of the engine oil. It is designed to prevent The baffle plate 11 is connected to the upper oil pan 3 via a plurality of bolts 19.

Two partition walls 14 and 15 are projected to the side of the high bottom portion 8 of the upper oil pan 3, respectively.
A cover 17 is provided so as to extend over the sidewalls 4 and 15 and the side wall 16, and thereby the first and second oil return passages 21 and 22 are defined in a pipe shape. The partition walls 14 and 15 are integrally formed with the upper oil pan 3 by aluminum casting, and the sheet metal cover 17 is connected via a plurality of bolts 18. Figure 1
Alternatively, in FIG. 3, reference numeral 24 denotes a boss portion for tightening the bolt 18.

In FIG. 2, the crankshaft 23 rotates clockwise as indicated by the arrow, and the first and second oil return passages 21,
22 is located on the left side of the crankshaft 23 and is arranged substantially parallel to the crankshaft 23.

The partition walls 14 and 15 are crankshafts 23, respectively.
And the one end 14A of the partition wall 14 extends substantially parallel to the crankshaft 2
3, the upstream inlet portions 25, 26 of the first and second oil return passages 21, 22 are opened so as to face each other in the rotational movement direction of the crankshaft 23.

That is, the inlet portion 2 of the first oil return passage 21
5 is opened between one end 14A of the partition wall 14 and the front portion 16A of the side wall 16, and the upper portion thereof is covered with a cover 17.

The inlet 26 of the second oil return passage 22 is the partition wall 1.
4 between one end 14A and one end 15A of the partition wall 15,
The upper part is covered with a cover 17.

The partition wall 15 is curved so as to project above the oil sump 7, and the cover 17 is also curved along this partition wall 15. The downstream outlets of the first and second oil return passages 21 and 22. Both parts 27 and 28 open toward the oil reservoir 7 from between the front end 11A of the baffle plate 11 and the side wall 4A of the lower oil pan 4.

The cylinder block 2 has an oil passage for returning the oil that lubricates the valve operating system of the cylinder head to the crank chamber 31.
(Not shown) is provided, and this oil passage is located above the first and second oil return passages 21 and 22 and is located on the left side in FIG.
Book, two on the opposite right side.

When the engine 1 is mounted in the engine room of a vehicle, the upper part of the engine is tilted rightward in FIG. 2 and is mounted horizontally.

It is configured as described above, and the operation will be described below.

In FIG. 2, the counterweight 29 of the crankshaft 23 is moved to the left (rotational motion) above the high bottom 8 as shown by the imaginary line a and the connecting rod is shown by the imaginary line b. The oil that has flowed down from the crank chamber 31 to the high-bottom portion 8 is agitated by the crankshaft 23 and the connecting rod, as shown by the white arrow in the figure, and the wind pressure thereof causes a lateral flow of the engine 1. Then, the gas flows into the two inlet portions 25 and 26 that are opened facing each other in the flow direction, and quickly flows down to the oil reservoir portion 7 through the first and second oil return passages 21 and 22.

Further, even when the oil in the oil sump portion 7 gets on the high bottom portion 8 due to the centrifugal force when the vehicle leans or turns, the high bottom portion 8 is agitated by the crankshaft 23 and the connecting rod. Oil first and second oil return passages 21, 22
It is possible to prevent the oil from being improperly sucked into the oil reservoir 7 by introducing it into the oil reservoir.

Since the inlet portions 25 and 26 are formed in a pipe-like shape whose upper portion is closed by the cover 17, most of the splashing oil scraped up by the crankshaft 23 and the connecting rod is passed through the cover 17. It is captured and quickly guided to the oil reservoir 7 through the first and second oil return passages 21 and 22.
Therefore, the amount of oil scattered in the crank chamber 31 can be suppressed, and the amount of oil carried away to the intake system together with the blow-by gas can be reduced.

Next, another embodiment shown in FIGS. 4, 5, 6 and 7 will be described. The oil pan 41 has a shallow high bottom portion 42 and a deep oil reservoir portion 43, and the oil pan 4
A housing 45 that defines an oil return passage 44 is provided on the side wall 46 of the No. 1.

The oil return passage 44 has two inlet portions 47 and 48 which are opposed to each other in the rotational movement direction of the crankshaft at the high bottom portion 42, and the outlet portion 4 which opens to the oil reservoir portion 43.
Have nine.

Also in this case, the oil flow agitated by the crankshaft and the connecting rod and the splashing oil scooped up are collected in the pipe-like inlets 47, 48 opening in the side wall 46.
Promptly return to the oil reservoir 43 through the oil return passage 44,
Oil can be circulated stably.

[0038]

According to the first aspect of the present invention, there is provided an oil sump portion for accumulating the oil sucked up by the oil pump, and a high bottom portion for allowing the oil after lubricating each engine portion to flow down to the oil sump portion. An oil pan device for an engine in which a high-bottom portion is arranged close to a rotation system of a crankshaft, an oil return device having an inlet portion located at the high-bottom portion and facing the rotational movement direction of the crankshaft and communicating with an oil reservoir. Since a passage is provided and this oil return passage is formed in the shape of a pipe line with its upper part closed, oil can be quickly returned through the oil return passage, and it is possible to prevent oil suction failure even when the vehicle shakes or the like. , While maintaining good engine lubrication,
It is possible to reduce the oil consumption by suppressing the oil scattered in the crank chamber. Particularly, in the present invention, since the oil return passage is formed in the shape of a pipe line with its upper part closed, the oil scraped up by the crankshaft and the connecting rod is reliably captured by the ceiling portion of the oil return passage, and therefore the crank Oil consumption can be reduced by suppressing the oil scattered in the room.

According to the second aspect of the present invention, the oil can be efficiently captured from the plurality of inlet portions, while the oil inflow portion from the oil return passage to the oil reservoir portion can be concentrated at one location.
This inflow portion can be set at a position separated from the strainer (oil intake to the engine) to reduce the oil temperature at the time of inflow to the strainer and reduce the heat load on the engine.

According to the third aspect of the present invention, the inflow oil from the upstream and downstream inlets interferes with each other in the oil return passage and is pushed up to the upstream side again. It can be prevented.

According to the fourth aspect of the invention, the return oil to the oil sump portion does not concentrate at a certain position due to the inclination, that is, it does not spread over a wide range of the oil sump portion, so that the oil to the strainer portion The flow direction of can be controlled more reliably.

According to the fifth aspect of the invention, since the baffle plate is used to suppress the sway of the return oil,
It is possible to more reliably prevent the return oil from flowing back from the upper part of the oil sump to the high bottom part or being scattered again to reduce the amount of the return oil.

According to the invention of claim 6, the structure of the oil can be simplified and the internal space of the oil pan can be effectively utilized, that is, it is necessary without sacrificing the ground clearance when the engine is mounted on the vehicle. The effect that a large oil pan capacity can be secured is obtained.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention.

FIG. 2 is a front sectional view of the same.

FIG. 3 is an exploded perspective view of the same.

FIG. 4 is a side sectional view showing another embodiment.

5 is a front cross-sectional view taken along the line AA of FIG.

FIG. 6 is a plan view of the same.

FIG. 7 is a perspective view of the same.

FIG. 8 is a partially cutaway side view of an engine showing a conventional example.

FIG. 9 is a plan view of a conventional oil pan.

[Explanation of symbols]

 1 Engine 2 Cylinder Block 3 Upper Oil Pan 4 Lower Oil Pan 7 Oil Reservoir 8 High Bottom 14 and 15 Partition 17 Cover 21 First Oil Return Passage 22 Second Oil Return Passage 23 Crankshaft 25,26 Inlet 27,28 Outlet Department

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshihiro Hirai 2 Takara-cho, Kanagawa-ku, Yokohama-shi, Kanagawa Nissan Motor Co., Ltd.

Claims (6)

[Claims] 1. An oil sump part for accumulating oil sucked up by an oil pump, and a high bottom part for allowing oil after lubricating each part of the engine to flow down to the oil sump part, the high bottom part being used as a crankshaft rotation system. In an oil pan device of an engine arranged in close proximity, an oil return passage communicating with the oil reservoir is provided, having an inlet located at the high bottom and facing the rotational movement direction of the crankshaft. An oil pan device for an engine, characterized in that the return passage is formed in the shape of a pipe line whose upper part is closed. 2. The engine according to claim 1, wherein a plurality of the inlet portions are opened at a high bottom portion, and the oils from the plurality of inlet portions are combined to flow into the oil sump portion. Oil pan device. 3. The oil pan device for an engine according to claim 2, wherein a partition wall is provided between the plurality of openings so as to branch the oil return passage downstream for a predetermined length. 4. A ceiling portion of the oil return passage is formed so that an inclination is increased toward an oil reservoir portion in a downstream portion of the oil return passage so that the oil flows in substantially downward. The oil pan device for an engine according to any one of claims 1 to 3. 5. The oil sump portion is connected to a high-bottom space by the oil return passage, and an upper portion of the oil sump portion is defined by a baffle plate. The oil pan of the engine according to any one of 4 above. 6. The oil return passage according to claim 1, wherein the oil return passage is provided on a flatly formed high bottom portion and only on the downstream side in the turning direction of the crankshaft. The oil pan device for an engine according to any one of claims.