JP2013083194A - Lubricating oil supply device of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lubricating oil supply device for an internal combustion engine which suppresses drive loss and warm-up delay caused by installation of a piston oil jet.
When the temperature of the engine oil rises, the oil pressure sensitive valve 10 opens at a relatively low oil pressure, the engine oil flows from the main gallery 7 to the sub gallery 11, and from the oil jet 12 to the lower surface of the piston 24, etc. The engine oil is injected towards. On the other hand, part of the engine oil in the sub-gallery 11 flows into the control oil passage 13 and is supplied to the hydraulic actuator 34 of the oil pump 4 as control oil pressure. When the control hydraulic pressure is supplied, the hydraulic actuator 34 drives the movable housing 33 to rotate, and the amount of engine oil discharged by the oil pump 4 increases. As a result, the engine oil consumed by the oil jet 12 is covered, and a sufficient amount of engine oil is supplied to the valve operating mechanism 22 and the crankshaft 23.
[Selection] Figure 7

Description

  The present invention relates to a lubricating oil supply device that supplies lubricating oil to each part of an internal combustion engine, and more particularly, to a technique for suppressing drive loss, warm-up delay, and the like caused by installation of a piston oil jet.

  For internal combustion engines (hereinafter referred to as engines), supply of lubricating oil consisting of oil pumps, oil filters, strainers, relief valves, etc., to pump engine oil to a valve mechanism or crank journal for lubrication and cooling A device is provided. In some engines, jet nozzles are installed in the crankcase in order to suppress the temperature rise of the pistons and cylinders during high rotation and high load, and the engine is directed from these jet nozzles toward the lower surface of the piston. A piston oil jet (hereinafter simply referred to as an oil jet) that injects oil is employed (see Patent Document 1).

In the oil jet of Patent Document 1, an oil jet valve including a valve body and a compression coil spring is interposed between the main gallery and the jet nozzle, and the hydraulic pressure of the main gallery increases to some extent as the engine speed increases. Then, the oil jet valve opens and engine oil is injected from the jet nozzle. In addition, constant-capacity trochoid oil pumps are often used for engine lubrication oil supply devices, but some trochoid oil pumps reduce the amount of discharge during high-speed rotation in order to reduce drive loss. There is also a variable capacitance type (see Patent Document 2) that can be made.
Japanese Utility Model Publication No. 62-24742 JP-A-8-210261

  In an engine in which an oil jet is incorporated, a large amount of engine oil flows into the jet nozzle when the oil jet valve is opened, so that the supply amount of engine oil to the valve operating mechanism and the crankshaft sharply decreases. Therefore, conventionally, it has been necessary to set the oil pump discharge amount large so that a sufficient amount of engine oil can be supplied even during operation of the oil jet, and there is no engine drive loss in the low speed rotation region where the oil jet does not operate. There was an increasing problem. In addition, in the conventional oil jet, the oil jet valve opens according to the oil pressure of the main gallery, so that when the piston or engine oil is cold, the engine warms up more slowly and fuel consumption is increased due to increased heat loss. There were also problems that resulted in worsening of emissions and an increase in harmful exhaust gas components.

  The present invention has been made in view of such a background, and an object of the present invention is to provide a lubricating oil supply apparatus for an internal combustion engine that suppresses drive loss, warm-up delay, and the like caused by installation of a piston oil jet.

  According to a first aspect of the present invention, there is provided a lubricating oil supply device (1) for supplying engine oil to a steady oil supply member (22, 23) and an unsteady oil supply member (12) constituting an internal combustion engine, wherein the internal combustion engine A variable displacement oil pump (4) driven by the engine and supplied with control oil pressure to increase discharge capacity, and engine oil supplied from the oil pump during operation of the internal combustion engine to the steady oil supply member A steady oil gallery (7) that is always guided, an unsteady oil gallery (11) that directs the engine oil to the unsteady oil supply member according to the operating state of the internal combustion engine, the steady oil gallery, and the unsteady oil gallery. Between the stationary oil gallery and the unsteady oil gallery when the oil pressure of the steady oil gallery reaches a predetermined valve opening threshold. Hydraulic responsive valve for providing communication between the re and (10), said a non-stationary oil gallery the oil pump to supply the control oil passage to the hydraulic as a control pressure (13).

  In the second aspect, the unsteady oil supply member is a piston oil jet (12) that cools the piston (24) and the cylinder (25) of the internal combustion engine with engine oil.

  In the third aspect, the oil pressure sensitive valve has a high valve opening threshold when the temperature of the engine oil is low, and a low valve opening threshold when the temperature of the engine oil is high.

  In the fourth aspect, the hydraulic pressure sensitive valve biases the valve body (52) that shuts off the steady oil gallery and the unsteady oil gallery, and the valve body in a shut-off direction with a predetermined biasing force. The valve spring is made of a shape memory alloy, and the urging force decreases when the temperature reaches a predetermined value.

  According to the present invention, when the supply of engine oil to the unsteady oil supply member is started as the oil pressure rises, the discharge amount of the oil pump is increased by introducing the control oil pressure from the unsteady oil gallery, A decrease in the amount of engine oil supplied to the steady oil supply member is suppressed. When the unsteady oil supply member is a piston oil jet, the piston and the cylinder are cooled by a sufficient amount of engine oil without hindering the lubrication of the valve operating mechanism and the crankshaft. In addition, when the valve opening threshold of the hydraulic pressure sensitive valve is high when the engine oil temperature is low, it is difficult to supply engine oil to the unsteady oil gallery when it is cold immediately after starting, and the warm-up is hindered by the piston oil jet. Is suppressed. Further, when the hydraulic pressure sensitive valve has a valve spring made of a shape memory alloy, the valve opening threshold value can be changed with a relatively simple structure.

It is a schematic block diagram of the lubricating oil supply apparatus which concerns on embodiment. It is a front view which shows the internal structure of the oil pump which concerns on embodiment. It is a see-through | perspective perspective view of the constant pressure maintenance valve | bulb which concerns on embodiment. It is operation | movement explanatory drawing of the constant pressure maintenance valve which concerns on embodiment. It is a see-through | perspective perspective view of the hydraulic pressure sensitive valve which concerns on embodiment. It is explanatory drawing which shows the action | operation at the time of the cold of the lubricating oil supply apparatus which concerns on embodiment. It is explanatory drawing which shows the action | operation at the time of warming-up completion of the lubricating oil supply apparatus which concerns on embodiment.

  Hereinafter, an embodiment in which the present invention is applied to a lubricating oil supply device for an automobile engine will be described in detail with reference to the drawings.

<< Configuration of Embodiment >>
<Overall configuration of lubricating oil supply device>
As shown in FIG. 1, the lubricating oil supply device 1 of this embodiment includes an oil pan 2, an oil strainer 3, an oil pump 4, an oil filter 5, a main gallery 7 (steady oil gallery), and a constant pressure maintenance. The main components are a valve 8, a hydraulic pressure sensitive valve 10, a sub gallery 11 (unsteady oil gallery), an oil jet 12 (unsteady oil supply member), a control oil passage 13, a relief oil passage 15, and a relief valve 16. As a component.

  The oil pump 4 sucks up engine oil stored in the oil pan 2 through the oil strainer 3 and pumps it to the main gallery 7. The oil filter 5 purifies the engine oil by capturing it with a filter main body 21 containing contaminants and moisture. The constant pressure maintaining valve 8 transforms the hydraulic pressure of the main gallery 7 to a predetermined pressure range, and then operates a valve mechanism 22 (intake / exhaust camshaft, intake / exhaust valve, cam chain, etc.) or crankshaft 23 (crank journal or crankpin). To supply. The hydraulic pressure sensitive valve 10 opens when the oil pressure of the engine oil reaches the valve opening threshold value, and supplies the engine oil to the sub gallery 11. The oil jet 12 has an orifice formed at its tip, and injects engine oil supplied via the sub gallery 11 onto the lower surface of the piston 24 and the inner wall surface of the cylinder 25 at a predetermined injection pressure. The control oil passage 13 introduces the oil pressure in the sub gallery 11 to the oil pump 4 as a control oil pressure. The relief valve 16 is opened at the middle and high speed rotation of the engine (when the discharge amount of the oil pump 4 is increased) so that the hydraulic pressure of the main gallery 7 does not increase excessively, and the engine is moved from the downstream side to the upstream side of the oil pump 4. Allow oil to circulate.

<Oil pump>
The oil pump 4 is a variable displacement type, and includes a movable housing 33, a hydraulic actuator 34, a return spring 35, and the like housed in a main housing 36 as shown in FIG.

  The movable housing 33 rotates within a predetermined angle range in order to increase or decrease the discharge amount of the oil pump 4. The hydraulic actuator 34 urges the movable housing 33 in the right rotation direction in the drawing when the control oil pressure is introduced from the control oil passage 13. When the control hydraulic pressure is released and the urging force of the hydraulic actuator 34 is lost, the return spring 35 returns the movable housing 33 to the original position by its elastic force.

<Constant pressure maintenance valve>
As shown in FIG. 3, the constant pressure maintaining valve 8 includes a valve body 42 in a stepped cylindrical valve body 41, and a valve spring 43 (compression coil spring) that urges the valve body 42 downward in the drawing. Contain. The valve body 41 is provided with an enlarged diameter portion 44 into which engine oil flows from the upstream side of the main gallery 7 at an intermediate portion in the vertical direction. Further, the valve body 42 has a bottomed cylindrical shape whose upper end (the side on which the valve spring 43 abuts) is closed by the end plate 45, and has a plurality of slits 46 along the axial direction of the valve body 41 on its outer periphery. ing. The valve body 42 slides up and down between an upper step portion 47 and a lower step portion 48 formed in the valve body 41.

  In the constant pressure maintaining valve 8, when the upstream hydraulic pressure is low, the valve body 42 is pushed downward by the urging force of the valve spring 43, as shown in FIG. The amount of overlap increases. On the other hand, when the upstream hydraulic pressure increases, the hydraulic pressure acts on the lower surface of the end plate 45 to overcome the urging force of the valve spring 43 as shown in FIG. The amount of overlap between 44 and the slit 46 is reduced. As a result, the hydraulic pressure on the downstream side of the main gallery 7 is maintained substantially constant, and an appropriate amount is applied to the valve mechanism 22 and the crankshaft 23 regardless of increase / decrease in the discharge amount of the oil pump 4 (that is, fluctuations in engine rotation speed). Engine oil is supplied.

<Hydraulic valve>
As shown in FIG. 5, the hydraulic valve 10 has a valve body 52 and a valve body 52 attached in a closing direction in a cylindrical valve body 51 interposed between the main gallery 7 and the sub gallery 11. An energizing valve spring 53 (compression coil spring) is accommodated. The valve spring 53 is made of a shape memory alloy such as titanium / tantalum or titanium / niobium. The spring force is kept high at low temperatures, while the spring force is increased at a predetermined temperature (for example, 80 ° C.). Decrease rapidly. Accordingly, the hydraulic pressure sensitive valve 10 has a high valve opening threshold value during cold (cold valve opening threshold value), and a low valve opening threshold value during warm (warm valve opening threshold value). In the case of this embodiment, the cold valve opening threshold is set to be significantly higher than the hydraulic pressure of the main gallery 7 in the medium speed rotation region of the engine.

<< Operation of Embodiment >>
<When cold>
When the engine that has been stopped for a relatively long time is started and the oil pump 4 starts to be driven by the crankshaft 23, the oil pump 4 uses the engine oil stored in the oil pan 2 as oil as shown in FIG. After sucking up through the strainer 3, the main gallery 7 starts to be discharged (supplied) with a predetermined discharge pressure. The engine oil discharged into the main gallery 7 is purified by the oil filter 5 and then flows into the constant pressure maintaining valve 8 and the hydraulic pressure sensitive valve 10. The engine oil that has flowed into the constant pressure maintaining valve 8 is regulated to a substantially constant pressure by the constant pressure maintaining valve 8 and then supplied to the valve operating mechanism 22 and the crankshaft 23 for lubrication and cooling.

  On the other hand, the engine oil that has flowed into the hydraulic pressure sensitive valve 10 side does not open unless the hydraulic pressure in the main gallery 7 reaches the cold valve opening threshold. It is blocked by the sensitive valve 10 and does not flow into the sub gallery 11. Thus, when cold, engine oil is not injected from the oil jet 12, the engine warm-up is not hindered by the low-temperature engine oil, and fuel vaporization in the combustion chamber is promoted, thereby improving fuel efficiency and detrimental. Reduction of exhaust gas components is realized.

<After completion of warm-up>
When the engine warm-up is completed and the temperature of the engine oil rises to the warm valve opening threshold, as shown in FIG. 7, the hydraulic pressure sensitive valve 10 has a relatively low hydraulic pressure (the main gallery 7 in the medium / low speed rotation region of the engine). The engine oil flows into the sub gallery 11 from the main gallery 7. Thus, engine oil is injected from the oil jet 12 provided at the end of the sub gallery 11 toward the lower surface of the piston 24 and the like, and the temperature rise of the inner wall surfaces of the piston 24 and the cylinder 25 is effectively suppressed.

  On the other hand, part of the engine oil in the sub-gallery 11 flows into the control oil passage 13 and is supplied to the hydraulic actuator 34 of the oil pump 4 as control oil pressure. When the control hydraulic pressure is supplied, the hydraulic actuator 34 drives the movable housing 33 to rotate rightward in FIG. 2, and the amount of engine oil discharged by the oil pump 4 increases as described above. As a result, the engine oil consumed by the oil jet 12 is covered, and a sufficient amount of engine oil is supplied to the valve operating mechanism 22 and the crankshaft 23.

  In the present embodiment, by adopting such a configuration, a sufficient amount of engine oil is supplied to the valve operating mechanism 22 and the crankshaft 23 even when the oil jet 12 is operated while suppressing the drive loss due to the oil pump 4. become able to. In addition, since the oil jet 12 does not operate when the temperature of the piston or engine oil is low, engine warm-up is promoted and fuel vaporization is prevented in the combustion chamber, reducing fuel consumption and reducing harmful exhaust gas components. It is also possible to prevent an increase.

  This is the end of the description of specific embodiments. However, aspects of the present invention are not limited to these embodiments. For example, in the above embodiment, the piston oil jet is used as the unsteady oil supply member. However, for example, a variable valve mechanism or the like may be used as the unsteady oil supply member. In the above embodiment, a hydraulic pressure sensitive valve whose valve opening threshold value is changed by a valve spring made of a shape memory alloy is used, but a hydraulic pressure sensitive valve having a wax-type biasing means is used instead of the shape memory alloy. Alternatively, a hydraulic pressure sensitive valve whose valve opening threshold is constant regardless of the temperature of the engine oil may be adopted. In addition, the specific configurations of the lubricating oil supply device and the piston oil jet can be set as appropriate without departing from the spirit of the present invention.

1 Lubricating oil supply device 4 Oil pump 7 Main gallery (steady oil gallery)
8 Constant pressure maintenance valve 10 Hydraulic pressure sensitive valve 11 Sub gallery (unsteady oil gallery)
12 Oil jet (unsteady oil supply member)
13 Control oil path 22 Valve mechanism (steady oil supply member)
23 Crankshaft (steady oiling member)
24 Piston 25 Cylinder 52 Valve body 53 Valve spring

Claims (4)

A lubricating oil supply device that supplies engine oil to a steady oil supply member and an unsteady oil supply member constituting an internal combustion engine,
A variable displacement oil pump that is driven by the internal combustion engine and is supplied with control oil pressure to increase discharge capacity;
A steady oil gallery that constantly guides engine oil supplied from the oil pump to the steady oil supply member during operation of the internal combustion engine;
An unsteady oil gallery that guides the engine oil to the unsteady oil supply member according to an operating state of the internal combustion engine;
Interposed between the steady oil gallery and the unsteady oil gallery, and opens when the oil pressure of the steady oil gallery reaches a predetermined valve opening threshold, and the steady oil gallery and the unsteady oil gallery A hydraulically sensitive valve that communicates with
A lubricating oil supply device for an internal combustion engine, comprising: a control oil passage for supplying the oil pressure of the unsteady oil gallery as a control oil pressure to the oil pump.   2. The lubricating oil supply device for an internal combustion engine according to claim 1, wherein the unsteady oil supply member is a piston oil jet that cools a piston or a cylinder of the internal combustion engine with engine oil.   The valve opening threshold of the hydraulic pressure sensitive valve is high when the temperature of the engine oil is low, and the valve opening threshold is low when the temperature of the engine oil is high. Item 3. A lubricating oil supply device for an internal combustion engine according to Item 2. The hydraulic pressure sensitive valve has a valve body that shuts off the steady oil gallery and the unsteady oil gallery, and a valve spring that biases the valve body in a shut-off direction with a predetermined biasing force,
4. The lubricating oil supply device for an internal combustion engine according to claim 3, wherein the valve spring is made of a shape memory alloy, and the urging force decreases when the temperature reaches a predetermined value. .

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