JP7306554B1 - oil jet device - Google Patents

Abstract

An object of the present invention is to reduce the size of an internal combustion engine. Injection means including an injection port for injecting oil; Cylindrical housing means for housing at least part of the injection means in a state movable along the central axis of the housing means; Control means for moving the injection means along the central axis by changing the hydraulic pressure in the housing means; injects oil with the injection port directed toward the piston of the internal combustion engine at a first position, and directs the injection port toward the bore of the internal combustion engine at a second position different from the first position in the direction of the central axis to inject oil. [Selection drawing] Fig. 2

Description

The present invention relates to an oil jet device for supplying oil to a piston of an internal combustion engine.

Techniques for injecting oil toward pistons of an engine are known. Patent Document 1 describes that a piston oil jet for supplying oil to a piston and a cylinder bore oil jet for supplying oil to a cylinder bore are respectively provided to supply oil to at least one of the piston and the cylinder bore. .

JP 2006-138307 A

In the lubricating device described in Patent Document 1, each oil jet requires a mechanism for switching between a state in which the oil jet is injected and a state in which the oil jet is not injected. Therefore, the lubricating device described in Patent Document 1 has a problem that the size of the device increases.

The present invention has been made in view of this point, and an object of the present invention is to provide a technique for miniaturizing an internal combustion engine.

An oil jet apparatus according to a first aspect of the present invention comprises injection means including an injection port for injecting oil, and cylindrical housing means, wherein the injection means is movable along a central axis of the housing means. and control means for moving the injection means along the central axis by changing the hydraulic pressure in the accommodation means, wherein the accommodation means includes the Guide means is provided for guiding the injection means so that when the injection means moves along the central axis, it rotates about the central axis as a rotation axis, and the injection means moves along the direction of the central axis. At a position 1, the injection port is directed toward a piston of the internal combustion engine to inject the oil, and at a second position different from the first position in the direction of the central axis, the injection port is directed toward the bore of the internal combustion engine to inject the oil. to inject.

The injection means includes a coupling portion coupled to the housing means so as to be movable along the central axis, and an injection pipe extending in a direction different from the direction of the central axis and having the injection port formed at its tip; may have

The control means is adapted to move the injection means to the first position when an injector for injecting fuel into the cylinder of the internal combustion engine is injecting a predetermined amount or more of fuel into the cylinder. When the hydraulic pressure in the means is set to the first hydraulic pressure value and the amount of fuel injected into the cylinder by the injector is less than the predetermined amount, the position of the injection means is adjusted to the second position. The hydraulic pressure may be set to the second hydraulic pressure value.

When the engine output of the internal combustion engine is equal to or higher than a reference value, the control means sets the hydraulic pressure in the storage means to a first hydraulic pressure value so that the position of the injection means is the first position, and the engine output is is less than the reference value, the hydraulic pressure in the storage means may be set to the second hydraulic pressure value so that the injection means is positioned at the second position.

The oil jet device may include a variable oil pump capable of changing the hydraulic pressure of the oil, and the control means may change the hydraulic pressure of the oil using the variable oil pump. The oil jet device is urging means whose longitudinal direction coincides with the longitudinal direction of the accommodating means, one end of which is fixed to the accommodating means, and the other end of which is coupled to the injection means. and the urging means for generating a urging force that pushes the injection means from the first position toward the second position, wherein the control means changes the hydraulic pressure of the oil so that the urging means may move the injection means from the first position to the second position.

ADVANTAGE OF THE INVENTION According to this invention, it is effective in size-reducing an internal combustion engine.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the outline|summary of the vehicle of embodiment. It is a schematic diagram which shows the structure of the principal part of an oil-jet apparatus. FIG. 3 is a schematic diagram showing the configuration of the essential parts of the injection section of the oil jet device; 1 is a schematic diagram showing a configuration of a vehicle; FIG. 4 is a flowchart showing a procedure of oil injection processing by a control unit;

[Outline of vehicle]
FIG. 1 is a diagram showing an outline of a vehicle 100 according to this embodiment. A vehicle 100 includes an internal combustion engine 1 and a control device 2 . The internal combustion engine 1 is, for example, a diesel engine. The internal combustion engine 1 includes injectors 11 , pistons 12 , crankshafts 13 and oil jet devices 14 . The control device 2 includes a storage unit 21 and a control unit 22 (corresponding to control means).

The injector 11 injects fuel into the cylinder of the internal combustion engine 1 . Piston 12 is attached to crankshaft 13 . When the injector 11 injects fuel into the cylinder of the internal combustion engine 1 , the fuel expanded by ignition in the cylinder of the internal combustion engine 1 pushes down the piston 12 to rotate the crankshaft 13 .

The oil jet device 14 injects oil into the piston 12 or the bore 16, which is the inner wall of the cylinder. The oil jet device 14 injects oil toward a jet cavity 15 provided in the piston 12 . At this time, the injected oil passes through the jet cavity 15 to cool the piston 12 . The oil jet device 14 switches between a state of injecting oil into the jet cavity of the piston 12 and a state of injecting oil into the bore 16 according to the oil pressure value in the oil jet device 14 set by the control device 2 .

The control device 2 is, for example, an ECU (Electronic Control Unit) that electronically controls each part of the vehicle 100 by a computer. The storage unit 21 has storage media such as ROM (Read Only Memory) and RAM (Random Access Memory), for example. The storage unit 21 stores various programs and various data for causing the control unit 22 to function.

The control unit 22 executes various functions by executing programs stored in the storage unit 21 . The control unit 22 injects oil to the piston 12 or the bore 16 from the oil jet device 14 . Although the details will be described later, the control unit 22 causes the oil jet device 14 to inject oil toward the piston 12 by setting the first hydraulic pressure value as the hydraulic pressure value in the oil jet device 14 . The control unit 22 causes the oil jet device 14 to inject oil toward the bore 16 by setting the second hydraulic pressure value lower than the first hydraulic pressure value as the hydraulic pressure value in the oil jet device 14 .

In this way, the control unit 22 injects oil into the bore 16 even when oil is not injected into the piston 12, so that it is possible to suppress the deterioration of the lubricity between the piston 12 and the cylinder. can. Therefore, the control unit 22 can improve the fuel efficiency of the internal combustion engine 1 . Further, the control unit 22 can switch between a state of injecting oil into the piston 12 and a state of injecting oil into the bore 16 by setting the hydraulic pressure value in the oil jet device 14 . Therefore, the internal combustion engine 1 does not need to separately provide a mechanism for switching whether to inject oil to the piston 12 and a mechanism for switching whether to inject oil to the bore 16, respectively. An increase in size can be suppressed.

[Switching mechanism of oil injection direction]
2 and 3 show the configuration of main parts of the vehicle 100. FIG. FIG. 2( a ) shows the state of the oil jet device 14 when injecting oil to the piston 12 . FIG. 2(b) shows the state of the oil jet device 14 when injecting oil into the bore 16. FIG.

The oil jet device 14 includes an injection portion 41 (corresponding to injection means), a housing portion 42 (corresponding to housing means), and a spring coil 43 (corresponding to biasing means). 2, the direction in which the spring coil 43 is provided with respect to the accommodation portion 42 is the left direction, and the direction in which the injection portion 41 is provided with respect to the accommodation portion 42 is the right direction.

The injection part 41 injects oil from the injection port 413 to the piston 12 or the bore 16 . The injection part 41 includes an injection pipe 411 , a coupling part 412 , an injection port 413 , a pin 414 , an oil leakage prevention ring 415 and an oil leakage prevention ring 416 . The injection pipe 411 extends in a direction different from the direction of the center axis of the cylindrical accommodating portion 42 . An injection port 413 is formed at the tip of the injection pipe 411 of the injection portion 41 .

The connecting portion 412 is a component for connecting the ejection pipe 411 and the housing portion 42 . Coupling portion 412 has a cylindrical shape. At least a portion of the coupling portion 412 is housed in the housing portion 42 . The connecting portion 412 is movable along the central axis of the accommodating portion 42 . In the example of FIG. 2, the connecting portion 412 is connected to the accommodating portion 42 via the spring coil 43 or the like. The connecting portion 412 may be directly connected to the housing portion 42 .

The coupling portion 412 is formed with an opening into which the oil discharged by the variable oil pump 3 flows. Further, a passage is formed in the coupling portion 412 to send the oil that has flowed in to the injection portion 41 . Oil discharged from the variable oil pump 3 is injected from the injection portion 41 through the passage.

The pin 414 is a convex portion protruding from the coupling portion 412 . The pin 414 is fitted in a guide groove (corresponding to guide means) 421 spirally formed inside the housing portion 42 . The pin 414 moves along the spiral guide groove 421 when the injection part 41 moves along the central axis of the housing part 42 . As the pin 414 moves along the guide groove 421 , the injection part 41 rotates about the central axis of the housing part 42 as a rotation axis.

The oil leakage prevention rings 415 and 416 are for suppressing leakage of oil from locations other than the injection port 413 in the oil jet device 14 . FIG. 2 shows cross sections of the oil leakage prevention rings 415 and 416 .

The accommodating portion 42 accommodates at least part of the injection portion 41 in a state in which it can move along the central axis of the accommodating portion 42 by the pressure of the oil discharged by the variable oil pump 3 . The housing portion 42 has a cylindrical shape. A spiral guide groove 421 is formed inside the accommodating portion 42 . The guide groove 421 guides the pin 414 of the injection section 41 so that the injection section 41 rotates about the central axis of the accommodation section 42 when the injection section 41 moves along the central axis of the housing section 42 . Instead of the guide groove 421, a rail or the like may be provided inside the housing portion 42 for guiding the injection portion 41 so that the injection portion 41 rotates.

The spring coil 43 has its longitudinal direction aligned with the longitudinal direction of the accommodating portion, one end of which is fixed to the accommodating portion 42 and the other end of which is coupled to the coupling portion 412 . The spring coil 43 generates an urging force that presses the injection portion 41 .

The variable oil pump 3 supplies oil into the housing portion 42 . The variable oil pump 3 can change the hydraulic pressure of the oil supplied into the housing portion 42 . In the example of FIG. 2 , the variable oil pump 3 supplies oil to the storage section 42 with the hydraulic pressure set by the control section 22 . Thick arrows in FIGS. 2(a) and 2(b) indicate the flow of oil. As shown in FIGS. 2(a) and 2(b), the oil sent into the housing portion 42 passes through the coupling portion 412 and the injection pipe 411 in order, and then from the injection port 413 to the piston 12 or the bore 16. sprayed towards.

The control unit 22 moves the injection unit 41 along the center axis of the storage unit 42 by changing the hydraulic pressure of the oil in the storage unit 42 . For example, the control unit 22 changes the hydraulic pressure of the oil using the variable oil pump 3 . As an example, the control unit 22 controls the variable oil pump 3 so as to change the amount of oil that the variable oil pump 3 sucks from an oil pan 4 (to be described later) and discharges to the storage unit 42, thereby increasing the amount of oil. Control hydraulic pressure.

In the example of FIG. 2 , the injection part 41 moves along the central axis of the housing part 42 according to the oil pressure set by the control part 22 . When the hydraulic pressure in the housing portion 42 is high, the coupling portion 412 pushes the spring coil 43, thereby moving the injection portion 41 leftward in FIG. When the hydraulic pressure in the accommodation portion 42 is low, the force of the spring coil 43 pressing the coupling portion 412 moves the injection portion 41 to the right in FIG.

When the control unit 22 sets the hydraulic pressure in the housing unit 42 to the first hydraulic pressure value, the spring coil 43 presses the injection unit 41 to the right in FIG. The force that presses 41 in the left direction in FIG. FIG. 2(a) shows a state in which the injection part 41 is at the first position. FIG. 3A shows the state of the injection pipe 411 and the injection port 413 when the injection portion 41 is at the first position. When the injection portion 41 is at the first position in the direction of the central axis of the housing portion 42 , the injection port 413 faces in the direction of injecting oil toward the jet cavity 15 of the piston 12 of the internal combustion engine 1 .

The control unit 22 changes the hydraulic pressure of the oil in the storage unit 42 from the first hydraulic pressure value to the second hydraulic pressure value when the injection port 413 is directed toward the bore 16 to inject the oil. Since the second hydraulic pressure value is lower than the first hydraulic pressure value, the force of the urging force of the spring coil 43 pressing the injection portion 41 to the right in FIG. is greater than the force pressing leftward in FIG. Therefore, the injection part 41 moves from the first position shown in FIG. 2(a) to the second position shown in FIG. 2(b) by the biasing force of the spring coil 43. The second position is a position different from the first position in the direction of the center axis of the accommodating portion 42 .

FIG. 2(b) shows a state in which the injection part 41 is at the second position. As indicated by the rightward arrow in FIG. 2(b), the injection part 41 has moved to the right in the state of FIG. 2(b) compared to FIG. 2(a). Since the pin 414 of the injection part 41 moves in the spiral guide groove 421 while the injection part 41 moves from the first position to the second position, the injection part 41 rotates about the central axis of the housing part 42 as the rotation axis. do.

FIG. 3B shows the state of the injection pipe 411 and the injection port 413 when the injection portion 41 is at the second position. As shown in FIG. 3(b), the injection pipe 411 rotates counterclockwise from the state shown in FIG. 3(a) by moving the injection part 41 from the first position to the second position. Since the injection pipe 411 extends in a direction different from the direction of the central axis of the housing portion 42, the orientation of the injection port 413 changes when the injection pipe 411 rotates about this central axis. Therefore, when the injection part 41 is at the second position in the direction of the central axis of the housing part 42 , the direction of the injection port 413 does not face the jet cavity 15 of the piston 12 . Oil is injected toward the bore 16 of the internal combustion engine 1 when the injection portion 41 is at the second position.

The control unit 22 switches between a state of injecting oil toward the piston 12 and a state of injecting oil toward the bore 16 according to the engine load. As an example, the control unit 22 accommodates the position of the injection unit 41 to the first position when the amount of fuel to be injected into the cylinder of the internal combustion engine 1 by the injector 11 (see FIG. 1) is equal to or greater than a predetermined amount. The hydraulic pressure in the portion 42 is set to the first hydraulic pressure value. The predetermined amount is, for example, a value less than the minimum injection amount of fuel that may damage or melt the piston 12 when the supply of oil to the piston 12 by the oil jet device 14 is stopped. When the amount of fuel that the injector 11 injects into the cylinders of the internal combustion engine 1 is less than a predetermined amount, the control unit 22 sets the oil pressure in the storage unit 42 to the second oil pressure so that the position of the injection unit 41 is at the second position. value.

In this way, the control unit 22 does not inject fuel into the piston 12 when the amount of fuel that the injector 11 injects into the cylinders of the internal combustion engine 1 is less than a predetermined amount, so that the hydraulic pressure of the oil in the storage unit 42 is increased. can be reduced. Therefore, the control unit 22 can reduce the ratio of using the driving force of the internal combustion engine 1 to generate the hydraulic pressure of the oil, so that the fuel efficiency of the vehicle 100 can be improved.

When the engine output is greater than or equal to the reference value, the control unit 22 may set the hydraulic pressure in the housing unit 42 to the first hydraulic pressure value so that the injection unit 41 is positioned at the first position. The reference value is a value less than the minimum value of the engine output that may damage or melt the piston 12 when the supply of oil to the piston 12 by the oil jet device 14 is stopped. When the engine output is less than the reference value, the control unit 22 may set the hydraulic pressure in the housing unit 42 to the second hydraulic pressure value so that the injection unit 41 is positioned at the second position. In this manner, the control unit 22 can reduce the hydraulic pressure of the oil in the housing unit 42 by not injecting fuel to the piston 12 when the engine output is less than the reference value. Therefore, the control unit 22 can reduce the ratio of using the driving force of the internal combustion engine 1 to generate the hydraulic pressure of the oil, so that the fuel efficiency of the vehicle 100 can be improved.

[Configuration of vehicle 100]
FIG. 4 shows the configuration of the vehicle 100. As shown in FIG. Vehicle 100 includes variable oil pump 3 , oil pan 4 , oil cooler 5 , water pump 6 , cylinder block 7 , turbocharger 8 , radiator 9 and oil jet device 14 . The oil cooler 5 has an oil thermostat 51 and a heat exchanger 52 . The hatched thick lines in FIG. 4 indicate paths through which oil circulates. Oil is pumped out from the oil pan 4 by the variable oil pump 3 and supplied to the oil jet device 14 via the oil cooler 5 . Thick arrows in FIG. 4 indicate paths along which cooling water circulates. Cooling water returns from the water pump 6 to the water pump 6 via the cylinder block 7 , the turbocharger 8 and the radiator 9 in order. A part of the cooling water flows from the cylinder block 7 to the radiator 9 without passing through the turbocharger 8 .

The oil pan 4 stores oil. The oil pan 4 is, for example, a container made of metal. The oil cooler 5 cools the oil. A valve of the oil thermostat 51 opens and closes according to the temperature of the oil. The oil thermostat 51 switches the path through which the oil circulates so that oil having a temperature exceeding a predetermined value flows through the heat exchanger 52 . The predetermined value is, for example, the upper limit of the temperature of oil suitable for cooling the piston 12 by the oil jet device 14 . On the other hand, the oil thermostat 51 switches the path through which the oil circulates so that oil having a temperature equal to or lower than a predetermined value does not flow through the heat exchanger 52 but is supplied to the oil jet device 14 . The heat exchanger 52 exchanges heat between the cooling water and the oil.

The water pump 6 circulates cooling water. The water pump 6 is driven by, for example, a belt attached to a crank pulley (not shown). Cylinder block 7 includes a plurality of cylinders and a crankcase that houses a crankshaft. The turbocharger 8 is a supercharger that increases the density of air sent into the internal combustion engine 1 . The radiator 9 cools the cooling water by releasing the heat of the cooling water into the air.

[Procedure for processing oil injection by the oil jet device 14]
FIG. 5 is a flow chart showing the procedure of oil injection processing by the control unit 22 . This procedure starts, for example, when the internal combustion engine 1 is started. First, the control unit 22 determines whether or not the engine output is greater than or equal to a reference value (S101). When the control unit 22 determines that the engine output is equal to or greater than the reference value (YES in S101), it determines whether or not the amount of fuel injected into the cylinders of the internal combustion engine 1 is equal to or greater than a predetermined amount (S102). When the control unit 22 determines that the amount of fuel injected into the cylinder of the internal combustion engine 1 is equal to or greater than the predetermined amount (YES in S102), the control unit 22 sets the hydraulic pressure in the housing unit 42 to the first hydraulic pressure value (S103). The control unit 22 determines whether or not the internal combustion engine 1 has stopped (S104). When the control unit 22 determines that the internal combustion engine 1 has stopped (YES in S104), the process ends.

When the control unit 22 determines that the engine output is less than the reference value in the determination of S101 (NO in S101), the control unit 22 sets the hydraulic pressure in the housing unit 42 to the second hydraulic pressure value (S105). move on. If the control unit 22 determines in S102 that the amount of fuel injected into the cylinder of the internal combustion engine 1 is less than the predetermined amount (NO in S102), the process proceeds to S105. When the control unit 22 determines that the internal combustion engine 1 has not stopped in the determination of S104 (NO in S104), it returns to the determination of S101.

In the flowchart of FIG. 5, when the control unit 22 determines that the engine output is equal to or greater than the reference value and that the amount of fuel injected into the cylinder of the internal combustion engine 1 is equal to or greater than a predetermined amount, the oil pressure in the storage unit 42 is is set to the second hydraulic pressure value, the present invention is not limited to this. The control unit 22 adjusts the oil pressure in the storage unit 42 when the engine output is equal to or higher than a reference value, or when the amount of fuel injected into the cylinder of the internal combustion engine 1 is equal to or higher than a predetermined amount. may be set as the second hydraulic pressure value.

[Effects of the internal combustion engine 1 of the present disclosure]
Since the control unit 22 injects oil into the bore 16 even when oil is not injected into the piston 12, it is possible to suppress a decrease in lubricity between the piston 12 and the cylinder. Therefore, the control unit 22 can improve the fuel efficiency of the internal combustion engine 1 . Since the internal combustion engine 1 does not need to separately include a mechanism for switching whether to inject oil to the piston 12 and a mechanism for switching whether to inject oil to the bore 16, the size of the internal combustion engine 1 is increased. can be suppressed.

Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments, and various modifications and changes are possible within the scope of the gist thereof. be. For example, all or part of the device can be functionally or physically distributed and integrated in arbitrary units. In addition, new embodiments resulting from arbitrary combinations of multiple embodiments are also included in the embodiments of the present invention. The effect of the new embodiment caused by the combination has the effect of the original embodiment.

1 Internal combustion engine 2 Control device 3 Variable oil pump 4 Oil pan 5 Oil cooler 6 Water pump 7 Cylinder block 8 Turbocharger 9 Radiator 11 Injector 12 Piston 13 Crankshaft 14 Oil jet device 15 Jet cavity 16 Bore 21 Storage unit 22 Control unit 41 Injection portion 42 Accommodating portion 51 Oil thermostat 52 Heat exchanger 100 Vehicle 411 Injection pipe 412 Joint portion 413 Injection port 414 Pin 415 Prevention ring 416 Prevention ring 421 Guide groove 43 Spring coil

Claims (6)

injection means including an injection port for injecting oil;
Cylindrical housing means for housing at least part of the injection means in a state movable along the central axis of the housing means;
a control means for moving the injection means along the central axis by changing the hydraulic pressure in the containing means;
The housing means is provided with guide means for guiding the injection means so as to rotate about the central axis when the injection means moves along the central axis,
The injection means directs the injection port toward a piston of the internal combustion engine to inject the oil at a first position in the direction of the central axis, and injects the oil at a second position different from the first position in the direction of the central axis. injecting the oil with a mouth directed into a bore of the internal combustion engine;
oil jet device. The injection means is
a coupling portion coupled to the housing means movably along the central axis;
an injection pipe extending in a direction different from the direction of the central axis and having the injection port formed at its tip;
having
The oil jet device according to claim 1. The control means is adapted to move the injection means to the first position when an injector for injecting fuel into the cylinder of the internal combustion engine is injecting a predetermined amount or more of fuel into the cylinder. When the hydraulic pressure in the means is set to the first hydraulic pressure value and the amount of fuel injected into the cylinder by the injector is less than the predetermined amount, the position of the injection means is adjusted to the second position. Set the oil pressure to the second oil pressure value,
The oil jet device according to claim 1 or 2. When the engine output of the internal combustion engine is equal to or higher than a reference value, the control means sets the hydraulic pressure in the storage means to a first hydraulic pressure value so that the position of the injection means is the first position, and the engine output is is less than the reference value, the hydraulic pressure in the storage means is set to the second hydraulic pressure value so that the position of the injection means is the second position.
The oil jet device according to claim 1 or 2. Equipped with a variable oil pump capable of changing the hydraulic pressure of the oil,
The control means changes the hydraulic pressure of the oil by the variable oil pump,
The oil jet device according to claim 1 or 2. biasing means whose longitudinal direction coincides with the longitudinal direction of the containing means, one end of which is fixed to the containing means, and the other end of which is coupled to the injection means; further comprising the biasing means for generating a biasing force that pushes the injection means toward the second position from the
the control means changes the hydraulic pressure of the oil so that the biasing force of the biasing means moves the injection means from the first position to the second position;
The oil jet device according to claim 1 or 2.

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