JPH05280322A - Management system of lubricating oil level in engine - Google Patents

Abstract

PURPOSE:To automatically hold the lubricating oil level in a range between the determined high level and low level by closing and opening first and second solenoid valves respectively by the oil level detection in an oil pan by means of an oil level detector. CONSTITUTION:When the oil level in an oil pan 12o reaches the high level H, No.1 solenoid valve 18 is closed, and No.2 solenoid valve 19 is opened, then the lubricating oil is returned into a sub tank 21 from the oil pan 12o by opening a pressure response valve 20b under pressure of a pump 14b. On the other hand, since a part of the supplied lubricating oil is circulated in a pump 14a by opening operation of the second solenoid valve 19, the pressure response valve 20a is not opened, so that, the oil level in the oil pan 12o is lowered. And when the oil level reaches the low level L, the solenoid valves 18, 19 are placed in opening and closing operation by an oil level detector 13, respectively. Therefore, the amount of oil reaches again the high level H, and the control operation mentioned above is automatically repeated. Then the oil level is automatically held between both levels of H to L.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is based on constant operation.
The present invention relates to an improvement of a lubricating oil level management system in one or more engines suitable for a plurality of internal combustion engines used in a so-called cogeneration system or a regular power generator.

[0002]

2. Description of the Related Art The applicant of the present invention has a problem in the conventional technique of circulating lubricating oil stored in an oil pan attached to an engine between the engine and the oil pan, and the oil pan has a large capacity. As a solution to the problem, the prior art relating to the application of Japanese Patent Application No. 2-407156 shown in FIG. 3 was previously proposed. In the figure, 1 is an engine with an oil pan 2, 3 is a supply pipe, and 4 is a supply pump. 10
Is a sub-tank of a separate type and is installed on the gantry 11. In this case, the height h ₁ of the gantry 11 is set to be higher than the level h ₂ of the set oil level of the oil pan 2 set by the below-described float type automatic oil supply device 17, so that the automatic oil supply device No pump is installed in the route 17 (auxiliary supply pipe 16). Reference numeral 12 is a main replenishment pipe for the lubricating oil, which is an electric valve 13 for stopping the engine and a pump 14a
Through the outlet 10a of the sub tank 10 and the oil pan 2
Are connected between the outlets 2a. Reference numeral 13a is a motor for operating the valve 13. Reference numeral 16 denotes an auxiliary supply pipe for lubricating oil, which is connected between the outlet 10b of the sub tank 10 and the outlet 2b of the oil pan 2 via an automatic float type oil supply device 17. Reference numeral 18 denotes a lubricating oil return pipe, and an outlet 10c above the sub tank 10 via a pump 14b and a filter 19.
Is connected between the outlet 2c at the lower end of the oil pan 2. In addition, each pump 14a, 14b is a common one motor 14
A tandem pump 15 driven by c is constructed.
Therefore, when the flow rate of the return pipe 18 is Q _A and the flow rate of the main supply pipe 12 is Q _B , these flow rates Q _A and Q _B are set to be the same by the principle of the tandem pump 15. However, if a difference occurs between Q _A and Q _B due to a change in the viscosity of the lubricating oil or the like, for example, this difference Q _C is set within the range of the replenishment capacity of the automatic oil supply device 17.

[0003]

By the way, in the prior art, a filter 19 is inserted at the outlet side of the pump 14b in order to remove sludge in the oil discharged from the oil pan 2 of the engine 1. Since 19 is the flow path resistance, the flow rate Q _B by the pump 14b is more
There is a phenomenon in which the flow rate becomes smaller than the flow rate Q _{A of} a and the oil level of the oil pan 2 rises. Although not shown, the pumps 14a and 14b are provided with safety valves, and when the flow path resistance increases, there is a pump that consumes itself and returns. In this case, the flow rate of the pump 14b is higher than that of the pump 14b.
This is because it is smaller than the flow rate of a. That is, even if both pumps 14a and 14b are driven by a common motor 14c through a gear so as to be driven by a tandem pump, the presence of the filter 19 causes the oil level of the oil pan 2 of the engine 1 to gradually rise. Therefore, this flow rate difference cannot be compensated by the adjustment by the automatic oil supply device 17, and in order to cope with this, it is necessary to monitor this phenomenon, operate the motor-operated valve 13, and occasionally stop the supply from the sub tank 10. It was a complicated situation. Moreover, in the lubricating oil circulation system that connects the oil pans of multiple engines and one sub-tank, the lubricating oil of the engine in operation is warmed when the engine that was stopped was driven. There was also a problem that the flow resistance due to the difference in lubricating oil viscosity between the lubricating oils would differ because the lubricating oil of the stopped engine was cold. It is an object of the present invention to provide a lubricating oil level management system for one or a plurality of engines, which solves the above-mentioned problems (problems) of conventional ones.

[0004]

According to the present invention, a sub-tank is separately installed in an engine having an oil pan, and a supply pipe between the oil pan and the engine, which is provided with a pump at a route of a circulation path of the lubricating oil, and a sub-tank. In a lubricating oil level management system for an engine equipped with a supply pipe between the oil pans and a return pipe between the oil pan and the sub tank, an oil level detector is provided on the oil pan and the pump is installed in parallel with the pump in the return pipe route. Is provided with a first solenoid valve, and a second solenoid valve is provided in parallel with the pump in the supply pipe route. These first and second solenoid valves are connected to the oil pan of the oil level detector. By detecting the high level of the oil level, the closing and opening operations are performed respectively, and by detecting the low level of the oil level of the oil pan, the opening and closing operations are performed, respectively.
The present invention relates to a lubricating oil level management system in an engine in which a pressure response valve is provided on the outlet side of each pump. In this case, it is preferable that the pumps provided in the return pipe route and the supply pipe route are constituted by tandem pumps driven by a common single motor. Further, when the engine with the oil pan is a plurality of engines with the oil pan and the sub-tank is one sub-tank common to these engines, each oil pan is provided with an oil level detector. At the same time, a separate first solenoid valve and a second solenoid valve are provided in parallel with each pump of the return pipe route and the supply pipe route, respectively.
And the second solenoid valves are respectively closed and opened by detecting the high level of the oil surface of the oil pan by the oil level detectors, respectively, and are opened and closed by the detection of the low level of the oil surface of each oil pan. It is desirable to perform a closing operation, and to provide a pressure response valve on each outlet side of each pump of each supply pipe route and each return pipe route. Also in this case, it is desirable that the pumps provided in the return pipe routes and the supply pipe routes are constituted by tandem pumps driven by a common motor. Further, the first based on the detection of the high level or the low level by each of the oil level detectors described above.
It is desirable to hold each closing operation of the electromagnetic valve or the second electromagnetic valve for a predetermined time. It is desirable that a filter circuit including a filter pump and a filter be provided in the sub-tank separately from the lubricating oil circulation system. Further, a centrifugal filter can be used as the above filter.

[0005]

According to the present invention, the oil level detector is provided in the oil pan of the engine, and the pump inserted in the route of the return pipe and the pump inserted in the route of the supply pipe are arranged in parallel. Since the first and second solenoid valves are provided, and the pressure response valves are provided on the pump outlet side of each route of the supply pipe and the return pipe, respectively, the following unique action is performed. ..
First, in the operating engine, when the oil level in the oil pan rises to a high level, the first solenoid valve is closed by a signal from the oil level detector to close the pump pressure of the return pipe route. Then, the pressure response valve of the same route is opened to return the lubricating oil from the oil pan to the sub tank, while the second solenoid valve is opened, so that the lubricating oil for replenishment by the pump of the replenishment pipe route runs idle. Therefore, since the pressure response valve of the same route does not reach the predetermined pressure and remains closed, the lubricating oil is not replenished to the oil pan, and the oil level of the oil pan goes from the high level to the low level. As a result, when the oil level in the oil pan of the engine during operation is surely reduced and the oil level is at a low level, the first solenoid valve is opened by the signal from the oil level detector to open the return pipe. Since a bypass circuit is formed in the root pump to reduce the pressure to the pressure response valve of the root, the pressure response valve is closed and the return of lubricating oil from the oil pan to the sub tank is stopped. On the other hand, since the second solenoid valve is closed by the signal of the oil level detector, the pressure response valve of the route is opened by the pressure of the pump of the supply pipe route, and the lubricating oil from the sub tank to the oil pan is released. Replenish the oil supply and move the oil amount in the oil pan to a higher level. When the oil level of the engine oil pan reaches the high level again, there is an operation by the oil level detector as described above, and the above operation is repeated. Eventually, the oil level of the engine oil pan rises from high level to low level. Hold between both levels. Next, in the case where each closing operation of the first solenoid valve or the second solenoid valve based on the detection of the high level or the low level by the oil level detector is held by the timer for a predetermined time respectively, The oil amount of the oil pan is adjusted within a predetermined level with reference to an intermediate position where the oil level of the oil pan goes from high to low or from low to high. The above-mentioned oil amount adjustments are performed in exactly the same way in the lubricating oil circulation system that connects one sub-tank and the oil pans of a plurality of engines shown in FIG.
In particular, when the engine in operation is started from the middle of operation, the control of each pressure response valve provided in each supply pipe route and each return pipe route for each engine is controlled by each first valve of each route. It is significant that the operation is surely performed by the operation of the second solenoid valve. Further, in each of the embodiments shown in FIGS. 1 and 2, the filter and the circuit of the filter pump are removed from the circulation path of the lubricating oil, and are independently mounted on the sub tank side. ) Is performed independently of the management of the lubricating oil surface.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to each embodiment shown in FIGS. Embodiment 1 FIG. 1 shows Embodiment 1 of the present invention. In FIG. 1, 11a is an engine and 12o is an oil pan attached to this engine. Reference numeral 13 denotes an oil level detector of the oil pan 12o, which outputs a high level detection signal "1" when the oil level of the oil pan reaches a predetermined high level H, and the oil level becomes a predetermined low level L. When is the low detection signal
A tandem pump 15 is driven by a common motor 14c, and a replenishment pipe 16 is routed.
The pump 14a is inserted into the root of the return pipe 17, and the pump 14b is inserted into the root of the return pipe 17. 18 is a first solenoid valve connected in parallel to the pump 14b of the return pipe 17,
Reference numeral 19 is a second solenoid valve connected in parallel to the pump 14a of the supply pipe 16. These first solenoid valve 18 and second
The electromagnetic valve 19 is closed and opened by the high level detection signal of the oil level detector 13, and is opened and closed by the low level detection signal. Reference numerals 20a and 20b denote first and second pressure response valves, respectively, which are opened at a predetermined set pressure (for example, 2 kgf / cm ² ) and are closed at a pressure lower than the above pressure, respectively, a supply pipe 16 and a return pipe. It is inserted into each outlet side of each of 17 pumps 14a and 14b. One end of the supply pipe 16 is connected to a sub tank 21 described later, and the other end is connected to an outlet 12a of the oil pan 12o.
One end of the return pipe 17 is connected to the sub tank 2 via the outlet 21a.
1, and the other end is connected to the outlet 12b of the oil pan 12o. 21 is a sub tank for supplying lubricating oil to the oil pan 12o, 22 is a solenoid valve, 23 is an atmosphere port, 24
a and 24b are auxiliary routes, respectively. The oil pan 12o is provided with a passage for supplying the lubricating oil stored in the oil pan 12o to the attached engine 11a via a separate pump as in the conventional one. This is the gist of the present invention. Since it has nothing to do with the above, its configuration and action are omitted.
F is a filter and 25 is a filter pump, which are connected in series and connected to the sub-tank 21 via the outlets 21b and 21c.

In the above structure, the valve 22 is opened and the pump 15 is driven to replenish the lubricating oil from the sub-tank 21 to the oil pan 12o via the replenishment pipe 16 and to replenish the oil pan 12o via the return pipe 17. A part of the lubricating oil is returned to the sub tank 21 via the return pipe 17, and the lubricating oil is circulated. By the way, according to the present invention, the first and second electromagnetic valves provided in parallel with the pump 14b inserted into the route of the return pipe 17 and the pump 14a inserted into the route of the supply pipe 16, respectively. The valves 18 and 19 are configured to operate by the detection operation of the oil level detector 13 of the oil pan 12o, respectively, and further, the pumps 14a and 14b of the route of the supply pipe 16 and the route of the return pipe, respectively. Pressure response valves 20a and 20b are provided on the outlet side, respectively. Therefore, for the engine 11a in operation, when the oil level of the oil pan 12o rises and reaches a high level (H), the first solenoid valve 18 is closed and the second solenoid valve 19 is opened, At the route of the return pipe 17, the pressure response valve 20b is opened by the pressure of the pump 14b to cause a predetermined return of lubricating oil from the oil pan 12o to the sub tank 21, while at the route of the supply pipe 18, Since a part of the lubricating oil replenished with the pump 14a circulates by the opening operation of the electromagnetic valve 19 of No. 2, the pressure response valve 20a does not open, and the lubricating oil replenished is temporarily stopped, so that the oil pan 12o Reduce the oil level of. As described above, the oil level of the oil pan 12o decreases from the high level (H), and when the oil level becomes the low level (L), the oil level detector 13 causes the first and second oil levels to decrease. The solenoid valves 18 and 19 are opened and closed, respectively. By circulating a part of the lubricating oil in the return pipe route between the pump 14b and the solenoid valve 18 by the opening operation of the first solenoid valve 18, the pressure of the pressure response valve 20b by the pump 14b decreases and the pressure is reduced. Since the response valve 20b is closed, the return of the lubricating oil to the sub tank 21 is stopped. On the other hand, the closing operation of the second solenoid valve 19 causes the pressure responsive valve 20a to reach a predetermined pressure from the pump 14a and the pressure responsive valve 20a opens.
Oil tank 12 from sub tank 21 through supply pipe 16
The lubricating oil is replenished to the oil tank o, and the oil amount in the oil tank 12o increases to reach the high level (H). Therefore, the amount of oil in the oil pan 12o becomes the high level (H) again, and the above control operation is automatically repeated in the same manner as described above, so that the oil level of these oil pans is automatically changed between H and L levels. Held in. In this embodiment, since the filter F is provided on the sub-tank side independently of the circulation path of the lubricating oil, the flow path resistance of the filter caused by the cleaning action of this filter is effective for controlling the oil level of the lubricating oil. Has no effect.

In the embodiment of FIG. 1, although not shown, the first solenoid valve 18 and the second solenoid valve 19 are provided with time setting means such as a time relay, respectively, so that the oil level detector 13 When each solenoid valve 18 or 19 is closed by the signal of, the closing operation is preferably maintained for a predetermined time. That is, in this case, when the oil level detector 13 detects, for example, the oil level of the oil pan 12o as a high level (H), the first solenoid valve 18 receives a signal from the oil level detector 13. Although the closing operation is performed, the closing operation is released only by holding for a predetermined time. Therefore, as described above, the stop of the lubricating oil return by the route of the return pipe 17 is released in a predetermined time, and the sub tank 17 is stopped. Since the return is resumed, the oil level of the oil pan 12o does not reach the low level (L), and the increase / decrease is repeated within a predetermined level range based on the level corresponding to a position approximately midway between the high level and the low level. ， The amount of oil in the oil pan will be adjusted. In this control, the level of the oil pan 12o is the low level (L).
The same holds true for the case where, the closing operation of the second solenoid valve 19 is held for a predetermined time and then released, so that the level of the oil pan 12o changes from the low level (L) to the high level (L). With respect to the intermediate position toward H), the increase / decrease is repeated within a predetermined level range. The operation of the filter F is performed as described above.

Embodiment 2 FIG. 2 shows the construction of Embodiment 2 of the present invention in which a plurality of engines with oil pans are connected to one sub tank. In the figure, 11a
₁ ～11A _n the first to n of the engine, 12o ₁ ~12o _n
Is the oil pan that comes with these engines. 13a
₁ ～13A _n are each in the oil level detector of each of the oil pan 12o ₁ ~12o _n, when the oil surface of the oil pan of each accessory becomes a predetermined high level H issues a high detection signal "1", also The low level detection signal "0" is output when each oil level reaches a predetermined low level L. 15a ₁ ~15
a _n are first to n-th tandem pumps, which are driven by common motors 14c _{1 to} 14c _n , _respectively , and supply pipes 16a ₁ to
Pumps 14a _{1 to} 14a _n inserted into the 16a _n route
A reversal pipe 17a ₁ ~17a _n Le - constituted by the pump 14b ₁ ~14b _n which is inserted into and. 18a _{1 to} 18a _n
Are each first through n reversals pipe 17a ₁ ～17A _n Le - first solenoid valve connected in parallel to each pump 14b ₁ ～14B _n in DOO, 19a ₁ through 19a _n are each first through the n pump 14a ₁ to 14A _n of the supply pipe 16a ₁ ~16a _n of a second solenoid valve connected in parallel. Each of these first solenoid valve 18a ₁ ~18a _n and second solenoid valves 19a ₁ through 19a _n
The oil level detectors 13a _{1 to} 13a _n respectively perform a high-level detection signal to perform a closing operation and an opening operation, respectively, and a low-level detection signal to perform an opening operation and a closing operation, respectively. 20a ₁ through 20a _n and 20b ₁ ~20b _n are each supply pipe 16a ₁ ~16a _n and reversals pipe 17a ₁ ~17a _n each Le of - in the first to pressure responsive valve of the n bets, each predetermined set pressure (For example, 2kgf /
cm ² ), and is closed below the above pressure. The pumps 14 a _{1 to} 14 a _n and 14 of the first to nth supply pipes 16 a _{1 to} 16 a _n and the return pipes 17 a _{1 to} 17 a _n are respectively closed.
It is inserted into each outlet of b ₁ ~14b _n. Each supply pipe 16a
₁ ～16A _n of one end supply main pipe 16, the other end is respectively connected to the outlet 12a ₁ ~12a _n of each oil pan 12o ₁ ~12o _n, one end of each reversal pipe 17a ₁ ~17a _n is reversed main 17 the other end is respectively connected to the outlet 12b ₁ ~12b _n of each oil pan 12o ₁ ~12o _n. 21 is a common sub tank for supplying the lubricating oil to the oil pan 12o ₁ ~12o _n, the base of the reversals main 17 is connected to the outlet 21a, the base of the supply main pipe 16 is inserted into the sub tank 21. Reference numeral 22 is a solenoid valve, 23 is an atmosphere port, and 24a and 24b are auxiliary routes. F is a filter, 25 is a filter pump, and these are connected in series and the outlet 21
It is connected to the sub tank 21 via b and 21c. In addition, each oil pan 12o ₁ ~12o _n, those conventional manner, and the route supplies are provided to the engine 11a ₁ ~11a _n that comes lubricating oil storage itself via individual pumps However, since this has nothing to do with the gist of the present invention, its configuration and operation will be omitted.

In the above structure, the valve 22 is opened and the pumps 15a _{1 to} 15a _n are driven to supply the main supply pipe 16
From the supply tanks 16a _{1 to} 16a _n through the sub tank 21
The lubricating oil as well as supplied to the oil pan 12o ₁ ~12o _n from a portion of the lubricating oil in the oil pan 12o ₁ ~12o _n via each reversal pipe 17a ₁ ~17a _n via the reversal main pipe 17 Return to the sub tank 21 and circulate the lubricating oil.
By the way, in the present invention, each of the return pipes 17a _{1 to} 17a
a _n Le - bets on the inserted pump 14b ₁ ~14b _n and the supply pipe 16a ₁ ~16a _n le - pump inserted in the sheet 1
4a ₁ to 14A _n first and second oil level detector 13a of the solenoid valves 18a ₁ ~18a _n and 19a ₁ through 19a _n respectively oil pan 12o ₁ ~12o _n that respectively provided in parallel _1-13
as well as configured to operate by a _n, further,
Each of the above pumps 14a _{1 to} 14a _n and 14b _{1 to} 14b _n
Pressure responsive valve to each outlet side of 20a ₁ through 20a _n and 20b ₁
˜20b _n are provided. Therefore, when the oil level of each of the oil pans, for example, the oil pans 12o ₁ and 12o ₂ rises to reach a high level (H) for each operating engine, the solenoid valves 18a ₁ of these routes are operated. , 18a ₂ and 19a ₁ and 19a ₂ are closed and opened respectively, so that each pressure response valve 20
By opening b ₁ and 20 b ₂ , the return pipes 17 a ₁ and 17
of a ₂ Le - up by and reversal lubricating oil of the oil pan 12o ₁ and 12o ₂ to the sub tank 21, whereas, the supply pipe 18
a _1, a 18a ₂ Le - pressure圧応valve 20a ₁ is bets, 20a ₂
By reliably circulating the lubricating oil replenished between the second solenoid valves 19a ₁ and 19a ₂ and the pumps 14a ₁ and 14a ₂ by the respective blocking actions of the above, and stopping the replenishment of each replenishing route, Try to reduce the oil level in the oil pans 12o ₁ and 12o ₂ . As a result, the oil pans 12o ₁ and 12o ₂
The oil level of the oil pans decreases from the high level (H), and when the oil levels of these oil pans 12o ₁ and 12o ₂ become the low level (L), the oil level detectors 13a ₁ and 13a ₂ respectively solenoid valves 18a _1, 18a ₂ and 19a _1, 19a ₂ and respectively opening operation and closing operation and reversal tubes Le shut the pressure responsive valve 20b _1, 20b ₂ - stop reversal in bets, whereas the pressure response open the valve 20a _1, 20a _2, Le of the supply pipe - since stopping part circulation of the lubricating oil by the solenoid valve 19a ₁ bets, 19a _2, the supply pipe Le - resume replenishment up side of the lubricating oil ，
Oil level of oil pans 12o ₁ and 12o ₂ is high level (H)
Head to. For this reason, the oil amounts in the oil pans 12o ₁ and 12o ₂ are again set to the high level (H), and the above control operation is automatically repeated in the same manner, and the oil levels of these oil pans are set to both levels H to L. Automatically retained in between.

The above description is for two operating engines 11a.
_1, an oil pan 12o ₁ of 11a _2, 12o ₂ and has been described the control of the circulation system of the sub-tank 21, the present invention is, in such operating condition, further, the engine in the rest, for example, the engine 11a _n is operated If this happens, it will exert a particularly effective function, so we will supplement this point next. Generally, the viscosity of lubricating oil decreases with its temperature. Therefore, a new order of the lubricating oil out of the temperature is not yet increased in the oil pan 12o _n operation is engine 11a _n, while the viscosity is still large, the engine 11a ₁ already in operation, 11a ₂
Since the viscosity of the lubricating oil circulating through the circulation system between the oil pans 12o ₁ and 12o ₂ and the sub tank 21 decreases due to the temperature rise, the following problems occur due to the difference in the viscosity of the two lubricating oils. Occurs. That is, the oil pan 12o _n amount of oil high level (H) a second where it is connected in parallel to the pump 14a _n which is inserted into the supply pipe 16a _n to be supplied to the oil pan 12o _n for detected a Even if the solenoid valve 19a _n opens and the lubricating oil for replenishment is circulated in the closed circuit connecting the solenoid valve 19a _n and the pump 14a _n , if the pressure response valve 20a _n does not exist, lubrication of the replenishment pipe route is performed. since the direction of the viscosity of the oil becomes smaller than the viscosity of the lubricating oil in the oil pan 12o _n, it will be supplied to the oil pan 12o _n without being weight loss due to the electromagnetic valve 19a _n, solenoid valve 1
Entering 9a _n is meaningless. It is detected that the oil amount of the oil pan 12o _n is low level (L), Reversal tube Le - is true similarly even when an attempt to stop the door. However, in the present invention, due to the presence of the pressure responsive valve 20a _n and 20b _n, the pressure responsive valve 20a _n or 20b _n until a predetermined pressure has been closed, supply or reversal of the oil pan 12o _n Since it is stopped, the circulation between the solenoid valve 19a _n and the pump 14a _n is forced when going from the high level to the low level, and the pressure response valve when going from the low level to the high level. With 20b _n , the return was reliably performed, and even when the engine was stopped, the circulation operation of the lubricating oil was not affected. In the case of the second embodiment as well, since the filter F is provided on the sub-tank 21 side independently of the circulation path of the lubricating oil, the cleaning action of the lubricating oil by the filter F does not affect the management control of the lubricating oil surface. Has no effect.

In the second embodiment of FIG. 2 also, although not shown, the first solenoid valves 18a _{1 to} 18a _n and the second solenoid valves 19a _{1 to} 19a _n of each route are provided with a time relay, etc., respectively. previously provided with a time setting means, the oil level detectors 13a ₁ to 13
When a respective solenoid valve by a signal from the _n 18a _{1 ~18a n} or 19a ₁ through 19a _n is closing operation, it is desirable to control their closing a to maintain a predetermined time.
With this configuration, as in the case of the first embodiment, the management control of the lubricating oil level in each oil pan attached to the engine during operation is performed at a substantially intermediate position between the high level (H) and the low level (L). It is controlled within the proper level range based on the standard.

[0013]

INDUSTRIAL APPLICABILITY The present invention, as described above, includes a single rule or a plurality of rules.
The first and second solenoid valves are provided for each pump in the supply pipe and the return pipe, and the pressure response valve is provided on the outlet side of each pump, and the first and second solenoid valves are provided for each oil. The oil level detector on the pan closes and opens when the oil level detector detects a high level, and the oil level detector detects a low level when the oil level detector closes and opens. It has such an excellent effect. The oil level of the oil pan of the engine is automatically held within a predetermined high level and low level interval range based on the detection operation of the oil level detector. In particular, in the case where only the closing operation of the first and second solenoid valves provided in parallel with the pump of the route of the return pipe and the supply pipe is cut off at a predetermined time by a time relay or the like,
It is excellent in that the above-mentioned control of the oil pan can be maintained within a range of the oil level which is narrower than that described above with reference to a substantially intermediate position between a predetermined high level and a low level. Further, in the case of the present invention, the filter is not provided in the lubricating oil circulation path and is independently provided on the sub-tank side. Therefore, while maintaining the lubricating oil cleaning action of the filter, the flow resistance of the filter is reduced. The effect no longer affects the control of the lubricating oil surface. Further, according to the present invention, since the pressure response valve is provided on the outlet side of the pump provided on the route of each return pipe and the supply pipe, the circulation path to the oil pans of a plurality of engines is particularly provided in one sub tank. Even when the engine that is not operating is started from the middle, the pressure response valve is appropriately controlled to be opened and closed by the closing operation of the first or second solenoid valve, so that the lubricating oil level Can always be properly managed.

[Brief description of drawings]

FIG. 1 is a schematic front view including a piping diagram showing a configuration of a first embodiment of the present invention.

FIG. 2 is a schematic front view including a piping diagram showing a configuration of a second embodiment of the present invention.

FIG. 3 is a schematic front view including a piping diagram showing a configuration of a conventional example.

[Explanation of symbols]

1,11a ₁ ~11a _n: engine 12o, 12o ₁ ~12o _n: the oil pan 13a, 13a ₁ ~13a _n: oil level detector 14a, 14a ₁ ~14a _n: the supply pipe le - pump 14b that is inserted into bets , 14b ₁ ~14b _n: reversal tube Le - pump 18a which is inserted into bets, 18a ₁ ~18a _n: a first solenoid valve 19a, 19a ₁ ~19a _n: the second solenoid valve 20a, 20a ₁ through 20a _n : pressure responsive valve 20b, 20b ₁ ~20b _n: pressure responsive valve 21: auxiliary tank 25: filter pump F, F ₁ ~F _n: filter

Claims (7)

[Claims] 1. A sub-tank is separately installed in an engine with an oil pan, and a supply pipe between an oil pan and an engine equipped with a pump at a route of a circulation route of lubricating oil, a supply pipe between the sub-tank and the oil pan, and In a lubricating oil level management system for an engine having a return pipe between an oil pan and a sub tank, an oil level detector is provided in the oil pan, and a first solenoid valve is provided in parallel with the pump in the return pipe route. Provided,
A second solenoid valve is provided in parallel with the pump in the supply pipe route, and each of the first and second solenoid valves detects the high level of the oil level of the oil pan by the oil level detectors. Closed and opened, and opened and closed by detecting the low level of the oil level in the oil pan, and pressure responses were made to the outlet side of each pump of the supply pipe route and return pipe route. A system for managing a lubricating oil level in an engine, which is characterized in that a valve is provided. 2. The engine according to claim 1, wherein the pumps provided in the return pipe route and the supply pipe route are constituted by a tandem pump driven by a common motor. Lubricant surface management system. 3. An engine with an oil pan is a plurality of engines with an oil pan, the sub-tank is a single sub-tank common to these engines, and each oil pan is provided with an oil level detector. , A separate solenoid valve and a second solenoid valve are provided in parallel with the pumps of the return pipe route and the supply pipe route, respectively.
And the second solenoid valves are respectively closed and opened by detecting the high level of the oil surface of the oil pan by the oil level detectors, respectively, and are opened and closed by the detection of the low level of the oil surface of each oil pan. 2. The lubricating oil level management system for an engine according to claim 1, wherein the system is closed and a pressure response valve is provided on the outlet side of each pump of each supply pipe route and each return pipe route. 4. A tandem pump driven by one common motor, wherein the pumps provided in each of the return pipe route and the supply pipe route are constituted by a tandem pump which is commonly used. Management system for lubricating oil level in engines. 5. The closing operation of each of the first solenoid valve and the second solenoid valve based on the detection of a high level or a low level by each oil level detector is held for a predetermined time, respectively. A lubricating oil surface management system for an engine according to any one of 1. 6. The lubricating oil level management system for an engine according to claim 1, wherein a filter circuit including a filter pump and a filter is provided in the sub tank separately from the lubricating oil circulation path. 7. The lubricating oil surface management system for an engine according to claim 6, wherein a centrifugal filter is used as the filter.