JPH1181966A - Engine with oil tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrict the deterioration of engine oil by closing a cutoff means interposed in an oil flow passage or in a negative pressure flow passage for connecting an engine intake system and an oil tank to each other when oil level of the oil tank more than the predetermined level is detected by a level detecting means. SOLUTION: An intake system 21a of an engine 21 and an oil tank 25 are connected to each other through a negative pressure hose 37 as a negative pressure flow passage, and the intake negative pressure is utilized at the time of starting the engine 21 so as to flow the engine oil 27 from an oil pan 23 into the oil tank 25. A large quantity of the engine oil 27 inside of the oil pan 23 and the oil tank 25 can be thereby housed, and deterioration of the oil 27 is prevented. An oil level sensor 33 is fitted inside of the oil tank 25, and when oil level inside of the oil tank 25 more than the predetermined level is detected, a solenoid valve 31 as a cutoff means interposed in an oil hose 29 is closed so as to prevent the flow of the oil 27 into the intake system 21, and deterioration of the oil is thereby prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an engine with an oil tank provided with an oil tank for increasing the engine oil capacity.

[0002]

2. Description of the Related Art Recently, with the development of turbo engines and the like,
High power output of the engine is becoming remarkable, and accordingly, the heat load on the engine oil is increased,
Since the circulation amount of the engine oil is increased, the deterioration of the engine oil tends to be accelerated. As a countermeasure, an engine with an oil tank equipped with an auxiliary oil tank for increasing the capacity of engine oil has been developed.

[0003] As this type of engine with an oil tank,
For example, one disclosed in Japanese Patent Application Laid-Open No. 8-128312 is known. FIG. 7 shows an engine with an oil tank disclosed in this publication, and an oil tank 5 called an increased oil pan is arranged below the oil pan 3 of the engine 1.

In the oil tank 5, a strainer 9 is provided.
Are arranged, and the oil tank 5 and the oil pan 3 are connected by an oil flow path 7. Then, the engine oil 11 in the oil tank 5 is circulated to various parts of the engine 1 via the strainer 9. The circulated engine oil 11 passes through the oil pan 3 and the oil flow path 7 and is returned to the oil tank 5 again.

[0005] In such an engine with an oil tank,
By increasing the capacity of the engine oil 11 by the oil tank 5, the total circulation amount of the engine oil 11 can be increased, and the heat load on the engine oil 11 is reduced, so that the deterioration of the engine oil 11 is suppressed. You. Also, since the capacity of the engine oil 11 is large,
The deterioration of the engine oil 11 is delayed as compared with an engine including only the oil pan 3.

[0006]

However, in such a conventional engine with an oil tank, the oil pan 3
Because the oil tank 5 is arranged at the lower part of
When applied to an automobile engine, there is a problem that the engine 1 has to be installed at a position higher than a predetermined position in the engine room due to the restriction of the minimum ground clearance.

The oil tank 5 and the oil passage 7
In the case where the size of the engine 1 in the lateral direction is large, interference with suspension parts and the like must be taken into consideration, and there is a problem that the degree of freedom of layout of the engine 1 in the engine room is reduced. On the other hand, an oil tank 5 is provided separately to provide an oil tank-equipped engine having an increased degree of freedom in engine layout.
Japanese Unexamined Patent Publication No. 4 and Japanese Unexamined Patent Publication No. Hei 7-259528 are known, but this type of engine with an oil tank has a problem that the mechanism is complicated and the manufacturing cost is increased.

The present invention has been made in order to solve such a conventional problem, and an object of the present invention is to provide an engine with an oil tank having a simple structure and capable of delaying deterioration of engine oil.

[0009]

According to a first aspect of the present invention, there is provided an engine with an oil tank, wherein the oil tank is connected to an oil pan disposed below the engine via an oil flow path. A negative pressure passage connecting the intake system of the engine and the oil tank; an oil level detecting means for detecting that the oil level of the oil tank has become higher than a predetermined level; and when the oil level has become higher than a predetermined level. And a shutoff means for closing the oil flow path or the negative pressure flow path.

According to a second aspect of the present invention, in the engine with the oil tank according to the first aspect, the oil level detecting means is an oil level sensor arranged in the oil tank, and the shutoff means is It is a solenoid valve arranged in the oil flow path or the negative pressure flow path. An engine with an oil tank according to a third aspect is the engine with an oil tank according to the first aspect,
The oil level detecting means and the shutoff means are a float disposed in the negative pressure flow path and a valve seat shut off by the float.

(Operation) In the engine with the oil tank according to the first aspect, the intake system of the engine and the oil tank are connected through a negative pressure flow path, and the negative pressure generated in the intake system is used when the engine is started. Thus, engine oil flows from the oil pan into the oil tank. Then, when the oil level detecting means in the oil tank detects that the oil level has exceeded a predetermined level, the shutoff means shuts off the oil flow path or the negative pressure flow path, and the engine oil flows into the intake system. Is prevented.

At the same time, the amount of engine oil in the oil pan is maintained at an optimal amount for operating the engine. Further, since the engine oil in the oil tank is not circulated in the engine, it is prevented from deteriorating during operation of the engine. In the engine with the oil tank according to the second aspect, the oil level sensor as the oil level detecting means is disposed in the oil tank, and the solenoid valve as the shutoff means is disposed in the oil flow path or the negative pressure flow path.

The oil level sensor reliably detects that the amount of engine oil flowing into the oil tank from the oil pan has exceeded a predetermined value, and the solenoid valve detects the amount of engine oil flowing from the oil pan into the oil tank. Engine oil is reliably shut off. In the engine with the oil tank according to the third aspect, the float and the valve seat, which are the oil level detecting means and the shutoff means, are arranged in the negative pressure passage.

[0014] Utilizing the negative pressure generated in the intake system when the engine is started, the engine oil flows into the oil tank and further into the negative pressure flow path.
Further, the float floats in the negative pressure flow path together with the oil level of the engine oil rising in the negative pressure flow path, and the float and the valve seat are pressed against each other in a pressed state, and the negative pressure flow path is shut off. .

[0015] Then, the engine oil amount in the oil pan is maintained at an optimal amount for operating the engine.

[0016]

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

FIG. 1 shows a first embodiment (corresponding to claims 1 and 2) of an engine with an oil tank according to the present invention. In the figure, the lower part 2 of the engine 21
An oil pan 23 is attached to 1a. An oil tank 25 is located near the oil pan 23.
Is arranged.

The position of the oil tank 25 is such that the bottom surface 25a of the oil tank 25 is higher than the maximum oil level H of the engine oil 27 in the oil pan 23. One end of an oil hose 29 is connected to the lower side wall 23a of the oil pan 23.
The other end of 9 is connected to the bottom surface 25a of the oil tank 25.

The oil hose 29 is provided with a solenoid valve 31 for shutting off the flow of the engine oil 27. In the oil tank 25, an oil level sensor 33 that detects that the engine oil 27 in the oil tank 25 has reached a predetermined amount is attached. This oil level sensor 33 is connected via a level signal line 33a.
It is connected to the controller 35.

The controller 35 and the solenoid valve 31 are connected by a control signal line 31a. One end of a negative pressure hose 37 is connected to the upper surface 25b of the oil tank 25, and the other end of the negative pressure hose 37 is connected to the engine 21.
Is connected to the intake system 21a.

In this embodiment, the other end of the negative pressure hose 37 is connected to an intake pipe 43 located between the air cleaner 39 and the turbocharger 41. In the above-described engine with an oil tank, most of the engine oil 27 is stored in the oil pan 23 when the engine 21 is stopped. With the start of the engine 21, a negative pressure is generated in the intake pipe 43, and the inside of the negative pressure hose 37 is reduced to a negative pressure. The engine oil 27 in the oil pan 23 uses the negative pressure to remove the oil hose 29. Through the oil tank 25.

When the engine 21 is started, the solenoid valve 31 is opened by the controller 35. As shown in FIG. 2, the oil level 27 a of the engine oil 27 in the oil tank 25 is
, A level signal is transmitted to the controller 35 via the level signal line 33a.

The controller 35 transmits a shut-off signal to the solenoid valve 31 via the control signal line 31a. The shut-off signal shuts off the solenoid valve 31 and stops the flow of the engine oil 27 from the oil pan 23 into the oil tank 25. Then, the amount of the engine oil 27
1 is maintained at an optimal amount to operate.

At the same time, the engine oil 27 in the oil tank 25 is prevented from flowing into the intake system 21a via the negative pressure hose 37. Here, the engine oil 27 flowing into the oil tank 25 is
And does not circulate in the engine 21, so there is no deterioration. Next, when the engine 21 is stopped,
Since the negative pressure of the intake system 21a is eliminated, the oil tank 25
The engine oil 27 in the oil tank 2
5 flows into the oil pan 23.

When the engine 21 operates, the engine oil 27 circulating in the oil pan 23 and deteriorating
And the engine oil 27 remaining in the oil tank 25 are mixed. In the engine with the oil tank configured as described above, the intake system 21a of the engine 21 and the oil tank 25 are connected via the negative pressure hose 37,
When the engine 21 is started, the engine oil 27 is supplied to the oil pan 23 using the negative pressure generated in the intake system 21a.
From the oil tank 25, a large amount of the engine oil 27 can be stored in the oil pan 23 and the oil tank 25, and the deterioration of the engine oil 27 can be delayed with a simple structure. .

Further, an oil level sensor 33 as oil level detecting means is mounted in the oil tank 25, and a solenoid valve 31 as shutoff means is mounted in the oil hose 29. The fact that the level has exceeded a predetermined level can be reliably detected.
Inflow of engine oil 27 to the engine can be reliably shut off.

Therefore, the intake system 2 of the engine oil 27
1a can be reliably prevented, and at the same time,
The amount of engine oil 27 in oil pan 23 can be maintained at an optimal amount for operating engine 21. Since the engine oil 27 flowing into and contained in the oil tank 25 is not circulated in the engine 21 during the operation of the engine 21, the deterioration of the engine oil 27 during the operation of the engine 21 can be prevented.

FIG. 3 shows a second embodiment (corresponding to claims 1 and 2) of an engine with an oil tank according to the present invention. In this embodiment, the mounting position of the solenoid valve 31 is different from that of the first embodiment.

That is, in this embodiment, the solenoid valve 31
Is attached to the negative pressure hose 37. In the engine with the oil tank of this embodiment, the same effect as that of the first embodiment can be obtained. However, in this embodiment, since the solenoid valve 31 is attached to the negative pressure hose 37,
The engine oil 27 does not flow into the vicinity of the solenoid valve 31, so that even if a failure or the like occurs in the seal of the solenoid valve 31, the engine oil 27 can be prevented from leaking outside.

FIGS. 4 and 5 show a third embodiment of the engine with an oil tank according to the present invention (claims 1 and 3).
FIG. 5 shows details of the main part of FIG. In this embodiment, a valve seat 51 made of, for example, an oil-resistant rubber plate is fixed in the negative pressure hose 37 in close contact with the inner wall 37 a of the negative pressure hose 37.

At the center of the valve seat 51, an opening 51a is provided.
Are formed. Below the valve seat 51, a spherical float 53 made of, for example, oil-resistant foam rubber is disposed. A lock bar 55 is attached to the upper part of the float 53, and the lock bar 55 is inserted into the opening 51 a of the valve seat 51.

At the tip of the locking rod 55, a locking claw 55a for preventing the float 53 from dropping into the oil tank 25 is provided.
Is formed larger than the opening 51 a of the valve seat 51. In the engine with an oil tank described above, the engine 2
1 starts the engine oil 2 in the oil pan 23.
7 flows into the oil tank 25. Further, as shown in FIG. 6, the engine oil 27 flows into the negative pressure hose 37, and the float 53 rises with the rise of the engine oil 27.

Then, the float 53 is pressed against the opening 51a of the valve seat 51, the negative pressure hose 37 is shut off, and the flow of the engine oil 27 into the oil pan 23 is stopped. Then, the amount of the engine oil 27 is maintained at an optimal amount for operating the engine 21.

At the same time, the engine oil 27 in the oil tank 25 is prevented from flowing into the intake system 21a via the negative pressure hose 37. In the engine with the oil tank of this embodiment, the same effects as those of the first embodiment can be obtained. However, in this embodiment, the oil level is detected and the flow of the engine oil 27 into the oil tank 25 is shut off. Is performed by the float 53 and the valve seat portion 51, so that a predetermined amount of the engine oil 27 can easily and reliably flow into the oil tank 25.

In the above-described embodiment, an example has been described in which the bottom surface 25a of the oil tank 25 is located at a position higher than the maximum oil level H in the oil pan 23. However, the present invention is not limited to such an embodiment. But, for example,
The position may be lower than the maximum oil level H. In this case, when the engine 21 is stopped, a part of the engine oil 27 remains in the oil tank 25, but the engine 21 and the oil tank 25 have a higher degree of freedom. Can be laid out.

[0036]

In the engine with the oil tank according to the first aspect, the intake system of the engine and the oil tank are connected via a negative pressure flow path, and the engine is started and the negative pressure generated in the intake system is utilized. Since the engine oil flows into the oil tank from the oil pan, a large amount of engine oil can be stored in the oil pan and the oil tank, and the engine oil has a simple structure, and the deterioration of the engine oil can be delayed. it can.

Further, since the oil level is provided in the oil tank and the shutoff means is provided in the oil flow path or the negative pressure flow path, the oil level in the oil tank becomes higher than a predetermined level by the oil level detection means. Can be detected, and the oil passage or the negative pressure passage can be blocked by the blocking means.

Therefore, the flow of engine oil into the intake system can be reliably prevented, and at the same time, the amount of engine oil in the oil pan can be maintained at an optimum level for operating the engine. it can. The engine oil flowing into and stored in the oil tank is not circulated into the engine during operation of the engine, so that deterioration during operation of the engine can be prevented.

In the engine with the oil tank according to the second aspect,
The oil level sensor, which is the oil level detecting means, is disposed in the oil tank, and the solenoid valve, which is the shutoff means, is disposed in the oil flow path or the negative pressure flow path. It is possible to reliably detect that the amount of the inflowing engine oil has exceeded a predetermined value, and it is possible to reliably shut off the inflow of the engine oil from the oil pan into the oil tank by the solenoid valve.

In the engine with the oil tank according to the third aspect,
Since the detection of the oil level and the shutoff of the flow of the engine oil into the oil tank are performed by the float and the valve seat, a predetermined amount of the engine oil can be easily and reliably flown into the oil tank.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of an engine with an oil tank according to the present invention.

FIG. 2 is a sectional view showing a state in which engine oil flows into the oil tank in the engine with an oil tank in FIG. 1;

FIG. 3 is a cross-sectional view showing a second embodiment of the engine with an oil tank according to the present invention.

FIG. 4 is a sectional view showing a third embodiment of the engine with an oil tank according to the present invention.

FIG. 5 is a sectional view showing details of a main part of FIG. 4;

FIG. 6 is a sectional view showing a state in which engine oil flows into a negative pressure hose.

FIG. 7 is a cross-sectional view showing a conventional engine with an oil tank.

[Explanation of symbols]

 Reference Signs List 21 engine 21a intake system 23 oil pan 25 oil tank 29 oil hose (oil flow path) 31 solenoid valve (cutoff means) 33 oil level sensor (oil level detection means) 37 negative pressure hose (negative pressure flow path) 51 valve seat 53 float

Claims (3)

[Claims] 1. An oil tank-equipped engine in which an oil tank is connected to an oil pan disposed below the engine via an oil flow path, wherein a negative connection that connects an intake system of the engine and the oil tank is provided. A pressure passage, an oil level detecting means for detecting that an oil level of the oil tank has become higher than a predetermined value, and a shutoff for closing the oil flow channel or the negative pressure flow channel when the oil level has become higher than a predetermined value. Means, and an engine with an oil tank. 2. The engine with an oil tank according to claim 1, wherein said oil level detecting means is an oil level sensor arranged in said oil tank, and said shutoff means is
An engine with an oil tank, wherein the engine is an electromagnetic valve arranged in the oil flow path or the negative pressure flow path. 3. The engine with an oil tank according to claim 1, wherein the oil level detecting means and the shutoff means are a float disposed in the negative pressure flow path and a valve seat shut off by the float. An engine with an oil tank.