JP2017036680A - Oil injection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil injection device enabling oil to be supplied to a piston only when an operating region of an internal combustion engine is a high load high rotation region.SOLUTION: When pressure of oil introduced to a hydraulic chamber 29 is larger than a predetermined value, a piston 26 is energized so as to move from a non-communication position where the hydraulic chamber 29 is not communicated with an injection nozzle 28 to a communication position where the hydraulic chamber 29 and the injection nozzle 28 are communicated with each other. When intake negative pressure applied to a negative pressure chamber 32 is larger than a predetermined value, a piston 27 is moved to a communication position where a relief chamber 34 and the hydraulic chamber 29 are communicated with each other. When the intake negative pressure applied to the negative pressure chamber 32 is the predetermined value or less, the piston 27 is energized so as to move to a non-communication position where the relief chamber 34 is not communicated with the hydraulic chamber 29.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an oil injection device, and more particularly to an oil injection device that injects oil toward a piston of an internal combustion engine when the oil pressure is greater than a predetermined value.

  As an oil injection device in which the oil pressure increases in proportion to the rotational speed of the internal combustion engine, when the oil pressure exceeds a predetermined value, the oil is injected toward the piston of the internal combustion engine, What is cooled is known (for example, see Patent Document 1).

  However, in this oil injection device, oil is injected into the piston even in an operation region where the piston does not need to be cooled, such as when the internal combustion engine is under low load and high rotation, and the piston is excessively cooled. Sometimes.

  As an oil injection device capable of preventing the oil from being injected into the piston at the time of low load and high rotation of the internal combustion engine, for example, the one described in Patent Document 2 is known. In this piston cooling device, when the internal combustion engine has a high intake negative pressure, the oil inlet and the oil outlet are closed with a movable valve by the intake negative pressure and the oil is not injected toward the piston.

  On the other hand, when the internal combustion engine has a low intake negative pressure and the load is high, the oil inlet and the oil outlet are communicated by the biasing force of the coil spring, so that the oil is injected toward the piston.

JP 2013-142297 A JP 2014-173562 A

  In the conventional oil injection device, since the movable valve is driven by the intake negative pressure, the oil is injected toward the piston at the time of high load and low rotation of the internal combustion engine where the oil pressure is low. As a result, there is a risk that the oil cannot be sufficiently supplied to hydraulic equipment driven by oil such as VVT (Variable Valve Timing) or lash adjuster when the internal combustion engine is running at a low speed.

  The present invention has been made paying attention to the above-described problems, and provides an oil injection device capable of supplying oil to a piston only when the operation region of the internal combustion engine is in a high load and high rotation region. It is for the purpose.

  The present invention is an oil injection device that injects oil toward a piston of an internal combustion engine when the pressure of the oil is greater than a predetermined value, the first cylinder chamber in which the first piston is accommodated, the second cylinder chamber A cylinder body having a second cylinder chamber in which a piston is accommodated, a relief hole communicating the first cylinder chamber and the second cylinder chamber, and an injection nozzle for injecting oil; a first cylinder chamber; An air pressure chamber formed by a piston and formed by a hydraulic chamber that causes the pressure of oil discharged from an oil pump to act on the first piston, a second cylinder chamber, and a second piston, and communicates with an intake passage of the internal combustion engine to intake air A relief formed by a negative pressure chamber that applies a negative pressure to the second piston, a second cylinder chamber, and a second piston, and is capable of communicating with the hydraulic chamber via a relief hole. The hydraulic chamber and the injection from the non-communication position where the hydraulic chamber and the injection nozzle are not in communication when the pressure of the oil housed in the main chamber and the first cylinder chamber is larger than a predetermined value. A first urging member that urges the first piston so as to be in a communication position where the nozzle communicates, and a magnitude of the intake negative pressure that is accommodated in the second cylinder chamber and acts on the negative pressure chamber is predetermined. If the magnitude of the intake negative pressure acting on the negative pressure chamber is less than or equal to a predetermined value, the second piston is moved to a communication position where the relief chamber and the hydraulic chamber communicate with each other. A second urging member that urges the second piston at a non-communication position where the hydraulic chamber is not in communication;

  As described above, according to the present invention, oil can be supplied to the piston only when the operation region of the internal combustion engine is in a high load and high rotation region, and the piston can be cooled when the piston needs to be cooled. Also, when the operating region of the internal combustion engine is in a low rotation region where the oil pressure is low, the oil is not supplied to the piston, so that the oil can be preferentially supplied to other hydraulic equipment driven by the oil. it can.

FIG. 1 is a view showing an oil injection apparatus according to an embodiment of the present invention, and is a cross-sectional view of an internal combustion engine provided with an oil jet. FIG. 2 is a diagram showing an oil injection device according to an embodiment of the present invention, which is a cross-sectional view of the oil jet, and the operation state of the oil jet when the operation region of the engine is in a high load and low rotation region FIG. FIG. 3 is a diagram showing a relationship between intake negative pressure and engine load in an engine to which the oil injection device according to one embodiment of the present invention is applied. FIG. 4 is a diagram showing a relationship between oil pressure and engine speed in an engine to which the oil injection device according to one embodiment of the present invention is applied. FIG. 5 is a diagram showing a relationship among an engine load, an engine speed, and an oil injection range in an engine to which the oil injection device according to one embodiment of the present invention is applied. FIG. 6 is a diagram illustrating an oil injection device according to an embodiment of the present invention, and is a diagram illustrating an operation state of an oil jet when an engine operation region is in a low load and low rotation region. FIG. 7 is a diagram illustrating an oil injection device according to an embodiment of the present invention, and is a diagram illustrating an operation state of the oil jet when the operation region of the engine is in a high load and high rotation region.

  Hereinafter, a diagram showing an oil injection device according to an embodiment of the present invention will be described with reference to the drawings. 1-7 is a figure which shows the oil-injection apparatus of embodiment which concerns on this invention. In FIG. 1, the upward direction and the forward direction are directions seen from the driver.

First, the configuration will be described.
As shown in FIG. 1, an engine 1 as an internal combustion engine attached to a vehicle such as an automobile is attached to a cylinder block 2, a cylinder head 3 attached to the upper surface of the cylinder block 2, and an upper surface of the cylinder head 3. A cylinder head cover 4 and an oil pan 5 which is attached to the lower surface of the cylinder block 2 and stores oil are provided.

  A cylinder 6 is formed in the cylinder block 2, and a piston 6 </ b> A is provided on the cylinder 6 so as to be movable up and down. The piston 6 </ b> A is connected to the crankshaft 19 via the connecting rod 18, and the lifting / lowering motion of the piston 6 </ b> A is converted to the rotational motion of the crankshaft 19 via the connecting rod 18.

  A crankcase 2A is formed below the cylinder block 2, and a crankshaft 19 is rotatably accommodated in the crankcase 2A. A crank chamber 10 is formed inside the crankcase 2 </ b> A, and the crank chamber 10 is installed above the oil pan 5.

  In the engine 1, a combustion chamber 7 is formed by the inner wall of the cylinder 6, the bottom surface of the cylinder head 3, and the top surface of the piston 6A. An intake port 8 and an exhaust port 9 are formed in the cylinder head 3, and the combustion chamber 7 communicates with the intake port 8 and the exhaust port 9, respectively. The number of combustion chambers 7 is provided according to the number of cylinders, and the intake port 8 and the exhaust port 9 are provided for each cylinder.

  An intake manifold 11 is attached to the cylinder head 3. The intake manifold 11 includes a throttle body 12 in which a throttle valve 12A is accommodated, a surge tank 13 provided on the downstream side of the throttle body 12, a branch from the surge tank 13, and provided on the downstream side of the surge tank 13, A plurality of branch pipes 14 connected to the intake port 8 are provided, and an intake passage 17 communicating with the intake port 8 is formed inside the intake manifold 11.

  An intake duct (not shown) is provided on the upstream side of the intake manifold 11 via an air cleaner (not shown). The air drawn from the intake duct is purified by the air cleaner and then introduced from the intake manifold 11 to each intake port 8. Is done.

  An exhaust manifold (not shown) is attached to the cylinder head 3, and the exhaust gas exhausted from the exhaust port 9 is collected in the exhaust manifold. The exhaust gas collected in the exhaust manifold is purified by a catalytic converter (not shown) provided on the downstream side of the exhaust manifold and then discharged to the outside. Here, upstream and downstream refer to upstream and downstream with respect to the flow direction of fluid such as intake air and exhaust gas.

  The cylinder head 3 is provided with an intake valve 15, and the intake valve 15 opens and closes the intake port 8. The cylinder head 3 is provided with an exhaust valve 16, and the exhaust valve 16 opens and closes the exhaust port 9.

  The engine 1 is provided with an oil jet 21, and the oil jet 21 is attached to the inner wall of the cylinder block 2 so as to be positioned in the crank chamber 10. The oil jet 21 of the present embodiment constitutes an oil supply device of the present invention.

  In FIG. 2, the oil jet 21 includes a cylinder body 22 installed in the crank chamber 10, and the cylinder body 22 is attached to the inner wall of the cylinder block 2 (see FIG. 1). The cylinder body 22 is provided with cylinder chambers 23 and 24, and the cylinder chambers 23 and 24 are partitioned by a partition wall 25.

  A piston 26 is accommodated in the cylinder chamber 23 so as to be movable up and down, and a piston 27 is accommodated in the cylinder chamber 24 so as to be movable up and down. Relief holes 25A to 25C are formed in the partition wall 25, and the cylinder chambers 23 and 24 communicate with each other through the relief holes 25A to 25C.

  The cylinder body 22 is provided with an injection nozzle 28. The injection nozzle 28 has an injection passage 28A communicating with the cylinder chamber 23, and the injection nozzle 28 extends from the cylinder body 22 toward the lower surface of the piston 6A.

  The cylinder chamber 23 of the present embodiment constitutes the first cylinder chamber of the present invention, and the cylinder chamber 24 constitutes the second cylinder chamber of the present invention. The piston 26 constitutes the first piston of the present invention, and the piston 27 constitutes the second piston of the present invention. Further, the relief hole 25A constitutes the first relief hole of the present invention, the relief hole 25B constitutes the second relief hole of the present invention, and the relief hole 25C constitutes the third relief hole of the present invention.

  A hydraulic chamber 29 is formed in the cylinder body 22, and the hydraulic chamber 29 is formed by the cylinder chamber 23 and the upper surface of the piston 26. A negative pressure chamber 32 is formed in the cylinder body 22, and the negative pressure chamber 32 is formed by the cylinder chamber 24 and the upper surface of the piston 27.

  In FIG. 1, an oil pipe 51 is connected to the cylinder body 22. An oil strainer 52 is provided at the upstream end of the oil pipe 51, and the oil strainer 52 is immersed in the oil O stored in the oil pan 5.

  The downstream end of the oil pipe 51 is attached to the cylinder body 22, and an oil pump 53 is provided in the middle of the oil pipe 51. The oil pump 53 includes a rotor (not shown) that rotates integrally with the crankshaft 19.

  The oil pump 53 sucks up the oil O in the oil pan 5 by the rotation of the engine 1, that is, the rotation of the crankshaft 19, purifies the sucked-up oil by the oil strainer 52, and introduces it into the hydraulic chamber 29.

  Thereby, the pressure (hydraulic pressure) of the oil introduced into the hydraulic chamber 29 increases as the rotational speed of the engine 1 increases. A relief chamber 30 is formed in the cylinder chamber 23, and the relief chamber 30 is formed on the opposite side of the hydraulic chamber 29 with the piston 26 interposed therebetween.

  A coil spring 31 is accommodated in the relief chamber 30, and the coil spring 31 urges the piston 26 upward (in the direction opposite to the oil introduction direction).

  In FIG. 1, one end of a negative pressure pipe 54 is connected to the cylinder body 22. The other end of the negative pressure pipe 54 is attached to the surge tank 13. The negative pressure chamber 32 communicates with the intake passage 17 through an intake passage 54 </ b> A formed inside the negative pressure pipe 54, and an intake negative pressure acts on the piston 27.

  A coil spring 33 is interposed between the upper surface of the piston 27 and the step portion 22A formed in the cylinder body 22, and the coil spring 33 moves the piston 27 downward (the direction in which the piston 27 is pulled by the negative intake pressure). In the opposite direction). The coil spring 31 of the present embodiment constitutes the first biasing member of the present invention, and the coil spring 33 constitutes the second biasing member of the present invention. Here, the biasing means that the pistons 26 and 27 are biased so that the pistons 26 and 27 are biased to one side.

  A relief chamber 34 is formed in the cylinder body 22 by a piston 27 and a cylinder chamber 24, and the relief chamber 34 can communicate with the hydraulic chamber 29 or the relief chamber 30 via relief holes 25A and 25B.

  The piston 27 has a partition portion 27A. The partition portion 27A protrudes from the side surface of the piston 27 toward the cylinder chamber 23 and comes into contact with the partition wall 25 to partition the relief chamber 34 into a relief chamber 34A and a relief chamber 34B. Yes.

  The relief chamber 34 </ b> A is configured by a groove formed in the piston 27. The relief chamber 34B is composed of an oil passage formed inside the piston 27. Oil is introduced into the relief chamber 34B through an opening 27a formed in the lower surface of the partition portion 27A, and is formed at the lower end of the piston 27. Oil is discharged through the opening 27b.

  The relief chamber 34A can communicate with the relief chamber 30 via the relief hole 25B, and the relief chamber 34B can communicate with the relief chamber 30 via the relief hole 25C.

  The relief chamber 34 of the present embodiment constitutes a first relief chamber, and the relief chamber 30 constitutes a second relief chamber of the present invention. The relief chamber 34A constitutes the third relief chamber of the present invention, and the relief chamber 34B constitutes the fourth relief chamber of the present invention.

  In the oil jet 21 of the present embodiment, the coil spring 31 biases the piston 26 upward to move the piston 26 to the non-communication position. When the piston 26 moves to the non-communication position, the injection passage 28A is closed, and the injection passage 28A of the injection nozzle 28 and the hydraulic chamber 29 are disconnected.

  The coil spring 31 is pressed and compressed by the piston 26 that moves downward when the pressure of the oil introduced into the hydraulic chamber 29 is greater than a predetermined value. When the coil spring 31 is compressed, the piston 26 moves from the non-communication position to a communication position where the hydraulic chamber 29 and the injection passage 28A of the injection nozzle 28 communicate.

  When the piston 26 moves to the communication position, the injection passage 28A is opened and the oil introduced into the hydraulic chamber 29 is injected from the injection nozzle 28 toward the piston 6A, the piston 6A is cooled, and the inner wall of the cylinder 6 The outer peripheral surface of the piston 6A is lubricated.

  In the oil jet 21 of the present embodiment, when the magnitude of the intake negative pressure acting on the negative pressure chamber 32 through the negative pressure pipe 54 is not more than a predetermined value, the piston 27 is urged downward by the coil spring 33 and is not in communication. Move to position.

  When the piston 27 moves to the non-communication position, the piston 27 closes the relief hole 25A, and the relief chamber 34A and the relief chamber 30 communicate with each other via the relief hole 25B, while the relief chamber 30 and the relief chamber 34B communicate with each other. It communicates via 25C. At the same time, the relief chamber 30 communicates with the crank chamber 10 through the relief chamber 34B.

  When the intake negative pressure acting on the negative pressure chamber 32 through the negative pressure pipe 54 is larger than a predetermined value, the piston 27 moves to the upper communication position against the urging force of the coil spring 33. When the piston 27 moves to the communication position, the relief hole 25A is opened, and the hydraulic chamber 29 communicates with the relief chamber 30 via the relief hole 25A, the relief chamber 34A, and the relief hole 25B, while the piston 27 closes the relief hole 25C. As a result, the relief chamber 30 and the relief chamber 34B are disconnected.

Next, the operation will be described.
(When the operating range of the engine 1 is in a low load and low rotation range)
When the engine 1 has a low load, the opening degree of the throttle valve 12A is small. Specifically, as shown in FIG. 3, the intake negative pressure changes in accordance with the accelerator opening, that is, the opening of the throttle valve 12A, and the load on the engine 1 increases (the throttle valve 12A It decreases as the opening increases).

  As a result, as shown in FIG. 6, when the engine 1 has a low load, that is, when the intake negative pressure is larger than a predetermined value, the intake negative pressure acting on the negative pressure chamber 32 increases, and the piston 27 Moves to the communication position against the urging force of the coil spring 33, and the relief hole 25A is opened.

  On the other hand, when the rotational speed of the engine 1 is low, the amount of oil discharged per unit time is small. Specifically, since the oil pump 53 is driven by the crankshaft 19, the oil pressure increases as the rotational speed of the engine 1 increases, as shown in FIG.

  As a result, when the rotational speed of the engine 1 is low, that is, when the rotational speed of the engine 1 is equal to or lower than a predetermined value, the pressure of the oil introduced into the hydraulic chamber 29 becomes low, and the piston 26 moves to the coil spring 31. Energized to move to the non-communication position and close the injection passage 28A.

  Further, since the piston 27 moves to the communication position, the relief hole 25C is closed by the piston 27, and the oil introduced into the hydraulic chamber 29 is not injected from the injection nozzle 28 (see FIG. 6). It is introduced into the relief chamber 30 through the relief chamber 34A and the relief hole 25B.

(When the operating range of the engine 1 is in a high load, low rotation range)
As shown in FIG. 2, when the engine 1 has a high load, the intake negative pressure acting on the negative pressure chamber 32 becomes small, and when the intake negative pressure becomes a predetermined value or less, the piston 27 moves to the coil spring 33. It is energized and moves to a non-communication position. Thereby, the relief hole 25A is closed.

  When the rotational speed of the engine 1 is low, the amount of oil discharged per unit time is small and the oil pressure is low. Therefore, when the rotational speed of the engine 1 is below a predetermined value, the piston 26 is a coil spring. It is urged by 31 and moves to a non-communication position.

  Thereby, oil is not injected from the injection nozzle 28, and oil is not discharged from the hydraulic chamber 29 to the relief chamber 34A.

  When the piston 27 moves from the communication position shown in FIG. 6 to the non-communication position shown in FIG. 2 due to a decrease in the intake negative pressure, the piston 27 closes the relief hole 25A, so that the hydraulic chamber 29 and the relief chamber 30 Becomes out of communication.

  Further, since the piston 27 opens the relief hole 25C, the oil accumulated in the relief chamber 30 is discharged from the relief hole 25C to the crank chamber 10 through the relief chamber 34B.

(When the operating range of the engine 1 is low load)
When the engine 1 has a low load, the piston 27 moves to the communication position against the urging force of the coil spring 33 (see FIG. 6 only for the position of the piston 27).

  When the piston 27 is in the communication position, the hydraulic chamber 29 and the relief chamber 30 communicate with each other via the relief chamber 34A, and the pressure from the hydraulic chamber 29 applied to the piston 26 and the pressure from the relief chamber 30 are the same. Further, the biasing force of the coil spring 31 to the piston 26 at this time is set to be substantially zero, and the piston 26 is in a non-communication position.

  Since the piston 27 opens the relief hole 25A, the oil is discharged from the hydraulic chamber 29 to the relief chamber 34A and is not injected from the injection nozzle 28 toward the piston 6A.

(When the operating range of the engine 1 is in a high load, high rotation range)
As shown in FIG. 7, when the engine 1 is under a high load, the intake negative pressure acting on the negative pressure chamber 32 becomes small, and when the intake negative pressure is equal to or less than a predetermined value, the piston 27 has a coil spring. It is urged by 33 and moves to a non-communication position. Thereby, the relief hole 25A is closed.

  When the rotational speed of the engine 1 is high, the amount of oil discharged per unit time increases, and the pressure of the oil introduced into the hydraulic chamber 29 increases. Thereby, when the rotation speed of the engine 1 is larger than a predetermined value, the piston 26 moves to the communication position against the urging force of the coil spring 31.

  Therefore, the oil introduced into the hydraulic chamber 29 through communication between the hydraulic chamber 29 and the injection passage 28A is injected from the injection nozzle 28 toward the piston 6A as indicated by an arrow O1, and the piston 6A is cooled and the cylinder The inner wall of 6 and the outer peripheral surface of the piston 6A are lubricated. As shown in FIG. 5, the operation region in which oil is injected in this way is only the high load and high rotation region of the engine 1.

  Here, the intake negative pressure (predetermined value) at the boundary between the low load and the high load of the engine 1 and the rotational speed (predetermined value) of the engine 1 at the boundary between the low rotational speed and the high rotational speed of the engine 1 are oil The negative pressure value for injecting oil from the jet 21 and the rotational speed are both set to satisfy the values.

  As described above, the oil jet 21 of the present embodiment is accommodated in the cylinder body 23 having the cylinder chamber 23 for accommodating the piston 26 and the cylinder chamber 24 for accommodating the piston 27, the cylinder chamber 23, and introduced into the hydraulic chamber 29. The piston 26 is moved from a non-communication position at which the hydraulic chamber 29 and the injection nozzle 28 are not in communication to a communication position at which the hydraulic chamber 29 and the injection nozzle 28 are in communication when the oil pressure is greater than a predetermined value. And a coil spring 31 to be urged.

  In addition to this, the oil jet 21 is accommodated in the cylinder chamber 24, and the relief chamber 34 and the hydraulic chamber 29 communicate with each other when the magnitude of the intake negative pressure acting on the negative pressure chamber 32 is larger than a predetermined value. When the piston 27 is moved to the communication position and the magnitude of the intake negative pressure acting on the negative pressure chamber 32 is a predetermined value or less, the piston 27 is moved to the non-communication position where the relief chamber 34 and the hydraulic chamber 29 are not in communication. A coil spring 33 is provided for biasing.

  Thereby, oil can be supplied to the piston 6A only when the operation region of the engine 1 is in a high load and high rotation region, and the piston 6A can be cooled when the piston 6A needs to be cooled.

  In addition, when the operating region of the engine 1 is in a low rotation region where the oil pressure is low, oil is not supplied to the piston 6A, so that oil is supplied to other hydraulic devices such as a VVT driven by the oil and a lash adjuster. Priority can be supplied.

  Further, since the oil is not injected to the piston 6A in the low load and low rotation range of the engine 1, it is possible to prevent the piston 6A from being excessively cooled by the oil and to prevent the fuel combustion from deteriorating. In addition to this, it is possible to prevent the oil from becoming a resistance and hindering the movement of the piston 6A, thereby preventing the fuel consumption of the engine 1 from deteriorating.

  Further, it is not necessary to use a sensor such as an intake pressure sensor for detecting the oil pressure of the oil flowing through the oil pipe 51 or the pressure of the intake air flowing through the intake passage 17, or using a device for electrically controlling the oil jet 21. Thus, the oil can be supplied to the piston 6A only when the operating region of the engine 1 is in a high load and high rotation region with a mechanical configuration. Thereby, the structure of the oil jet 21 can be simplified and the manufacturing cost of the oil jet 21 can be reduced.

  In particular, according to the oil jet 21 of the present embodiment, the piston 27 has the partition portion 27A that partitions the relief chamber 34 into the relief chamber 34A and the relief chamber 34B, and when the piston 27 moves to the communication position, The hydraulic chamber 29 communicates with the relief chamber 30 via the relief hole 25A, the relief chamber 34A, and the relief hole 25B, while the relief chamber 30 and the relief chamber 34B are disconnected.

  As a result, when the engine 1 is warmed up in a low load and low rotation range, low temperature oil can be stored and warmed in the relief chamber 30, and early oil warm-up can be achieved.

  Further, according to the oil jet 21 of the present embodiment, the cylinder body 22 is installed in the crank chamber 10, and the relief chamber 34B communicates with the crank chamber 10, so that the injection from the injection nozzle 28 toward the piston 6A is performed. When not sprayed, the oil can be reliably returned to the oil pan 5. In addition, since it is unnecessary to form a passage in the cylinder block 2 for returning the oil to the oil pan 5, it is possible to eliminate the need for extra processing on the cylinder block 2 and increase the manufacturing cost of the cylinder block 2. Can be prevented.

  The oil jet 21 according to the present embodiment is injected by opening and closing the injection passage 28A and the relief hole 25A by the pistons 26 and 27 in a high load, a high rotation region and a high load, and an operation region other than the high rotation region. Although switching is performed so that oil is injected or not injected from the nozzle 28, the present invention is not limited to this.

  For example, the oil injection amount may be gradually changed according to the intake negative pressure and the oil pressure between a low load and a low rotation range to a high load and a high rotation range.

  While embodiments of the invention have been disclosed, it will be apparent to those skilled in the art that changes may be made without departing from the scope of the invention. All such modifications and equivalents are intended to be included in the following claims.

DESCRIPTION OF SYMBOLS 1 ... Engine (internal combustion engine), 5 ... Oil pan, 6A ... Piston, 10 ... Crank chamber, 21 ... Oil jet (oil supply device), 22 ... Cylinder main body, 23 ... Cylinder chamber (first cylinder chamber), 24 ... Cylinder chamber (second cylinder chamber), 25A ... Relief hole (first relief hole), 25B ... Relief hole (second Relief hole), 25C ... relief hole (third relief hole), 26 ... piston (first piston), 27 ... piston (second piston), 27A ... partitioning part, 28 ... injection nozzle, 29 ... hydraulic chamber, 30 ... relief chamber (second relief chamber), 31 ... coil spring (first urging member), 32 ... negative pressure chamber 33 ... Coil spring (second biasing member), 34 ... Relief chamber (first relief chamber), 34A ... Relief chamber (third relief chamber), 34 ... relief chamber (the fourth of the relief chamber)

Claims (3)

An oil injection device that injects oil toward a piston of an internal combustion engine when the pressure of the oil is greater than a predetermined value,
A first cylinder chamber in which the first piston is accommodated, a second cylinder chamber in which the second piston is accommodated, a relief hole and oil for communicating the first cylinder chamber and the second cylinder chamber; A cylinder body having an injection nozzle for injecting;
A hydraulic chamber that is formed by the first cylinder chamber and the first piston and that causes the pressure of oil discharged from an oil pump to act on the first piston;
A negative pressure chamber that is formed by the second cylinder chamber and the second piston, communicates with an intake passage of the internal combustion engine, and applies an intake negative pressure to the second piston;
A relief chamber formed by the second cylinder chamber and the second piston and capable of communicating with the hydraulic chamber via the relief hole;
When the pressure of the oil housed in the first cylinder chamber and introduced into the hydraulic chamber is larger than a predetermined value, the hydraulic chamber and the hydraulic chamber are separated from a non-communication position where the hydraulic chamber and the injection nozzle are not in communication. A first urging member that urges the first piston so as to be in a communication position where the spray nozzle communicates;
When the magnitude of the intake negative pressure that is accommodated in the second cylinder chamber and acts on the negative pressure chamber is larger than a predetermined value, the second chamber is located at a communication position where the relief chamber communicates with the hydraulic chamber. When the piston is moved and the magnitude of the intake negative pressure acting on the negative pressure chamber is a predetermined value or less, the second piston is attached to a non-communication position where the relief chamber and the hydraulic chamber are not in communication. An oil injection device comprising: a second urging member that urges. The internal combustion engine has an oil pan for storing oil, and a crank chamber installed above the oil pan,
The oil injection apparatus according to claim 1, wherein the cylinder body is installed in the crank chamber, and the relief chamber communicates with the crank chamber. When the relief chamber is a first relief chamber, the first cylinder chamber has a second relief chamber on the opposite side of the hydraulic chamber across the first piston, and the second relief chamber The first biasing member is accommodated in the relief chamber;
The second piston has a partition that divides the first relief chamber into a third relief chamber and a fourth relief chamber;
When the relief hole is a first relief hole, the cylinder body has a second relief hole that communicates the second relief chamber and the third relief chamber, and the second relief chamber. A third relief hole communicating with the fourth relief chamber;
When the second piston moves to the communication position, the hydraulic chamber communicates with the second relief chamber via the first relief hole, the third relief chamber, and the second relief hole. On the other hand, the second relief chamber and the fourth relief chamber are disconnected,
When the second piston moves to the non-communication position, the third relief chamber communicates with the second relief chamber via the second relief hole, while the second relief chamber 3. The oil injection device according to claim 1, wherein the fourth relief chamber communicates with the fourth relief chamber via the third relief hole.

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