JPS63195310A - Lubricating device for internal combustion engine - Google Patents

Abstract

PURPOSE:To surely supply oil in starting an engine by providing a check valve closing when pressure in an oil passage becomes lower in a connecting passage between the oil passage from an oil pump to each part of the engine and an accumulator. CONSTITUTION:An oil pump 3 sucks in oil 2 in an oil pan 1, and pressingly feeds it through an oil filter 4 to an oil passage 5 connected to each part of an engine. An accumulator 7 is connected to the oil passage 5 through a connecting passage 6, which is provided with a check valve 8 closing when pressure in the oil passage 5 becomes lower than that in the accumulator 7. The push rod 12 of an actuator 11 is provided opposite to the valve body 9 of the check valve 8, and the actuator 11 functions in response to a starter-ON signal 13 for a fixed time to forcibly open the check valve 8 for securing supply of oil.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lubricating device for an internal combustion engine, and more particularly to a lubricating device that can supply sufficient seedling oil to each part of the engine even when the engine is started.

[Prior Art] In the lubrication system of an internal combustion engine, oil is usually pumped up from an oil pan by an oil pump that rotates as the engine rotates, and after the oil passes through an oil filter etc., it requires lubrication. Sent to each department of the organization.

However, when the engine starts, the oil passages that supply oil are not necessarily filled with oil; the engine cranks, the oil pump begins to discharge lubricating oil, and the oil passages are filled with oil, causing oil pressure to drop. Since oil is not supplied to each moving part of the engine, each 1i!
! Moving parts are poorly lubricated. Therefore, problems such as scuffing, wear, and seizure may occur.

In order to deal with such problems, conventional methods have been to connect an accumulator in the middle of the lubricating oil path to each part of the engine, store oil in the accumulator, and supply the oil to each part of the engine when starting. structure
67634 Tan Publication, Japanese Unexamined Patent Publication No. 108444/1983)
Or, an auxiliary pump is installed separately from the main oil pump.
There is known a structure (Japanese Patent Laid-Open No. 50-43337) in which the auxiliary pump is controlled via a solenoid relay or a timer, and the engine is started after oil is supplied by the auxiliary pump.

[Problems to be Solved by the Invention] However, in the structures shown in the above-mentioned JP-A-48-67634@ and JP-A-49-108444, oil is supplied from the accumulator when the engine is running at low speed. However, since the check valve installed in the oil path connecting the accumulator to the oil path is a check valve that operates in the direction of preventing backflow from the oil path to the accumulator,
There is a possibility that the oil in the accumulator may leak out at low speeds when the engine is going from running to stopping, or when the engine is stopped. If the oil in the accumulator has leaked out, oil cannot be replenished at the time of starting, so there is a problem in that the reliability of oil replenishment at the time of starting is lacking.

Further, the structure shown in Japanese Patent Application Laid-Open No. 50-43337@ requires an auxiliary pump, which leads to problems of complication of the mechanism, increase in cost, and further complication of the control system.

The present invention addresses the problems in the prior art as described above.
With a simple structure, the purpose is to reliably prevent lubrication failure when starting the engine.

[Means for Solving the Problems] A lubricating device for an internal combustion engine according to the present invention that meets this objective is a lubricating device for an internal combustion engine that pumps oil from an oil pan using an oil pump and pumps the oil to various parts of the engine. An accumulator is connected to the oil passage from to each part of the engine, and the connection passage between the accumulator and the oil passage is
A check valve is provided that opens when the pressure in the oil passage becomes lower than the pressure in the accumulator and operates in a direction to prevent the backflow of oil from the accumulator to the oil passage. It consists of an actuator connected to forcibly open the check valve based on the operation start signal.

Here, it is preferable that the actuator forcibly opens the check valve for a certain period of time based on a signal from a timer.

[Function] In such a 1171 sliding device, the check valve provided in the connection path between the accumulator and the oil path to each part of the engine,
Since this is a check valve that operates in the direction of preventing the backflow of oil from the accumulator to the oil path side, the oil in the accumulator provided in the accumulator will not flow out into the oil path during normal operation. Therefore, when the engine is started, a predetermined amount of oil is reliably stored in the accumulator. When the engine is started, this check valve is forcibly opened by an actuator, and the oil in the accumulator is sent into the oil passage and sent to each part of the engine through the oil passage.

Therefore, even when the oil pump is not rotating sufficiently or the oil passage is not sufficiently filled with oil, the oil for the seedlings is reliably delivered from the accumulator. Poor lubrication of each of the 18 moving parts is prevented.

The forced opening operation of the check valve is stopped after the oil in the accumulator runs out or after a certain period of time, and during normal operation, oil is accumulated in the accumulator again in a predetermined amount and at a predetermined pressure. Ready for startup.

[Embodiments] Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a lubricating device for an internal combustion engine according to a first embodiment of the present invention. In the figure, 1 is an oil pan that stores oil 2, 3 is an oil pump that pumps up and pressure-feeds oil from the oil pan 1, 4 is an oil filter, and 5 is oil for each part of the engine that requires lubrication (not shown). In this embodiment, an accumulator 7 is connected to this oil passage 5 at a position immediately after the oil filter 4 via a connecting passage 6.The oil storage capacity of the accumulator 7 is At the same time, a sufficient amount of oil can be supplied to each part of the engine.
is set to the capacity of the pool.

A check valve 8 is provided at the oil inlet/outlet of the 7-cumulator 7 in the connection path 6 . The check valve 8 consists of a valve body 9 made of a ball biased in one direction by a spring 10.
When the pressure of the oil in the oil passage 5 is lower than the pressure of the oil in the accumulator 7, it becomes a leap and operates in a direction to prevent oil from flowing backward from the accumulator 7 into the oil passage 5.

An actuator 11 is connected to the check valve 8 .

The actuator 11 is composed of an electromagnetic actuator, and when the actuator 11 is turned on, the bushing rod 12 pushes the valve body 9 of the check valve 8, so that the check valve 8 can be forcibly opened. It has become. The actuator 11 is turned on for a certain period of time by a timer 14 based on a starter ON signal @13.

Therefore, the actuator 11 forcibly opens the check valve 8 for a certain period of time set by the timer 14 based on the engine operation start signal.

In the embodiment device configured as described above, during normal operation, most of the pressurized oil discharged by the oil pump 3 is sent to each part of the engine, and a portion is sent to the check valve 8.
The liquid flows into the accumulator 7, pushing aside the valve body 9, and is accumulated in the accumulator 7. According to this accumulated amount, the oil pressure in the accumulator 7 increases, and when it substantially matches the oil pressure in the oil passage 5, the flow of oil into the accumulator 7 is stopped. Thereafter, even if the oil pressure in the oil passage 5 is lower than the internal pressure of the accumulator 7, the check valve 8 prevents the oil in the accumulator 7 from leaking into the oil passage 5, and the oil is stored in the accumulator 7.

When the engine is restarted after being stopped, the engine is cranked by the starting aid means. In response to the starter-on signal when activating this starting aid means, the timer 14 is activated, and the actuator 11 is energized for a predetermined period of time. When the actuator 11 is turned on, the bushing rod 12 is pushed toward the valve body 9, pushing the valve body 9 away and forcing the check valve 8 to open. Then, the oil stored in the accumulator 7 is
Due to the difference between the internal pressure and the internal pressure of the oil passage 5, the oil is discharged into the oil passage 5, fills the oil passage 5, and is sent to each part of the engine. During this time, the oil pump 3 rotates due to cranking, and the oil pan 1
The oil inside is pumped up and discharged to the oil filter 4, but since the cranking rotation speed is relatively low and the amount of oil discharged from the oil pump 3 is also small, the amount of oil discharged from the oil pump 3 alone is insufficient to prevent the oil from entering the oil passage 5. It takes time to fill the engine with oil and distribute the oil to each part of the engine. However, during this time, a sufficient amount of oil discharged from the accumulator 7 is supplied to the oil passage 5, so a sufficient amount of oil is quickly supplied to each part of the engine, and the oil pump 3
This compensates for the lack of oil in the area.

The time for which the accumulator 7 is kept energized by the timer 14 is set to be enough time for the oil pump 3 to be able to supply a sufficient amount of oil to each part of the engine after the engine starts, so there is insufficient oil supply at the time of engine startup. It will never become. This timer 14 is not particularly set; for example, the actuator 11 is activated when the discharge pressure of the oil pump increases sufficiently or when the oil pump rotation speed increases sufficiently.
The operation may be stopped. Furthermore, regarding oil in the accumulator 7 to flow out into the oil passage 5, even if the operation of the actuator 11 is stopped while there is still hanging oil in the Aki 1 Mullet Tough, the oil in the accumulator 7 will not flow out. The operation of the actuator 11 may be stopped after the oil has run out.

Further, in the above operation, the oil discharged from the accumulator 7 into the oil passage 5 also fills the oil pump 3. Since the oil pump 3 also has a mechanical configuration, it is desirable that it be filled with as much oil as possible at the time of start, thereby ensuring smoother operation.

Next, FIG. 2 shows a second embodiment of the present invention. In the figure, 21 is an oil pan for storing oil 22, 23 is an oil pump, 24 is an oil filter, and 25 is an oil passage.
6 and a valve train oil passage 27. Since the engine valve train generally has a longer oil path from the oil pump 23 than the crankshaft system, it is often subject to more severe regulations regarding friction. Therefore, in this embodiment, an accumulator 28 is specifically connected to this valve train oil passage 27 via a reverse ratio valve 29. An electromagnetic actuator 31 equipped with a bushing rod 30 is connected to the check valve 29, and the actuator 31 forcibly closes the check valve 29 for a certain period of time via a timer 33 based on a starter ON signal 32.
The structure for opening is similar to that of the first embodiment.

In this way, the present invention can be applied only to oil passages to parts that are exposed to more severe conditions, and by restricting it to a specific part, the capacity of the accumulator 28 can be small, and it can be efficiently used at the time of startup. The r11 slippage problem is resolved. Other operations are similar to those in the first embodiment.

[Effects of the Invention] As explained above, when using the lubricating device for an internal combustion engine of the present invention, an accumulator is connected to the oil path from the oil pump, and a check valve that operates in a direction different from the conventional one is installed in the connection path. Since the check valve is installed in an actuator and is forcibly opened when the engine is started, the predetermined ω is
, it is possible to reliably store oil at a predetermined pressure in the 7 cumulator, and to supply the oil reliably and sufficiently to each part of the main machine at the time of startup, and to supply each part of the main machine at the time of cranking.
It is possible to reliably prevent poor lubrication of delta moving parts and reduce friction. By reducing friction, the power of the starter can be saved and the starter can also be made smaller.

Furthermore, since the oil from the accumulator flows through the oil passage into the oil pump, the lubrication condition at the time of starting the oil pump can also be improved.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of a lubricating system for an internal combustion engine according to a first embodiment of the present invention, and FIG. 2 is a system diagram of a lubricating system for an internal combustion engine according to a second embodiment of the present invention. 1.21... Oil pan 2.22... Oil 3.23... Oil pump 4.24... Oil filter 5.25... ...Oil line 6...Connection path 7.28...Accumulator 8.29...Check valve 9... ... Valve body 10 ... Spring 11.31.
... Actuator 12.30 ... Bush rod 13.32 ... Starter on signal 1
4.33... Timer

Claims (2)

[Claims] (1) In a lubricating system for an internal combustion engine in which oil is pumped up from an oil pan by an oil pump and sent under pressure to various parts of the engine, an accumulator is connected to an oil path from the oil pump to each part of the engine, and the accumulator and the oil path are connected to the oil path from the oil pump to each part of the engine. A check valve that closes when the pressure in the oil path becomes lower than the pressure in the accumulator to prevent backflow of oil from the accumulator to the oil path is provided in the connection path, and the check valve includes: A lubricating device for an internal combustion engine, characterized in that an actuator is connected to forcibly open a check valve based on an engine operation start signal. (2) The lubricating device for an internal combustion engine according to claim 1, wherein the actuator is an actuator that forcibly opens the check valve for a certain period of time based on a signal from a timer.