JP4913029B2 - Lubricating oil supply system - Google Patents

Description

  The present invention relates to a lubricating oil supply system for preventing seizure and wear reduction of an internal combustion engine, and more particularly, to a lubricating oil supply system capable of injecting lubricating oil at an optimal timing.

In order to prevent seizure and wear reduction of a cylinder and a plunger (piston) constituting an internal combustion engine, a method of discharging a lubricating oil by pressing the plunger with a cam has been conventionally used (see, for example, Patent Document 1).
There is also known a technique for enabling lubrication at an optimal timing. For example, Patent Document 2 discloses a lubrication pump system capable of performing lubrication in association with an engine cycle accurately by performing extrusion lubrication with a hydraulic cylinder controlled by an electromagnetic valve (see Patent Document 2).
Japanese Patent Laid-Open No. 2001-191200 Special table 2004-519595 gazette

However, in the method of simply pushing the plunger with a cam and discharging the lubricating oil as disclosed in Patent Document 1, it is not possible to lubricate at the optimum timing, and a lot of lubricating oil is wasted.
On the other hand, the technique disclosed in Patent Document 2 can eliminate such waste and perform lubrication at an optimal timing. However, since the method of controlling the electromagnetic valve is used, failure is likely to occur. There was a problem with the reliability of the device.
Furthermore, although the required amount of lubricating oil discharged toward the engine may vary depending on the shape of the piston of the engine, etc., the conventional method cannot adjust the amount of discharged oil according to the required amount.

  Accordingly, the problem to be solved by the present invention is to provide a lubricating oil supply system that not only eliminates the waste of a large amount of lubricating oil by performing lubrication of only a necessary amount at an optimal timing, but also has excellent reliability. There is. Another object of the present invention is to provide a lubricating oil supply system capable of adjusting the amount of discharged oil according to the required amount.

  In order to solve the above problems, among the present inventions, a first invention is a first cam that is driven in synchronization with an engine piston, a first cylinder that temporarily holds lubricating oil, and a first cylinder that is disposed in the first cylinder. A first plunger that moves up and down in conjunction with the first cam, a suction path for sucking the lubricating oil from the lubricating oil supply tank into the first cylinder according to the vertical movement of the first plunger, and the first plunger A first structure comprising a delivery path with a check valve for delivering the lubricating oil sucked and held in the first cylinder to the second cylinder according to the vertical movement of the first cam, and the piston of the first cam and the engine A second cam that is driven in synchronization with the second cylinder, a second cylinder, a discharge path that is connected to the second cylinder and discharges lubricant toward the engine, and moves up and down in conjunction with the second cam. Arranged in the cylinder And a second structure including a second plunger having a communication path that communicates the delivery path of the first structure and the discharge path at a timing when the piston ring of the engine passes over the discharge port in the engine connected to the discharge path. And a lubricating oil supply system.

  Further, the second invention is based on the first invention, and the first plunger sucks the lubricating oil into the first cylinder by the forward path, and then returns the lubricating oil sucked and held in the first cylinder. And a lubricating oil supply system configured to maintain the compressed state for a predetermined period.

  Further, the third invention is based on the second invention so that the communication path of the second cylinder communicates with the discharge port in the engine within a predetermined period in which the compressed state is maintained by the first plunger. Provided is a configured lubricating oil supply system.

  Moreover, 4th invention provides the lubricating oil supply system which further provided the lower limit setting part which sets the lower limit at the time of the up-and-down movement of a 1st plunger based on any one invention from 1st to 3rd.

  Further, the fifth invention is based on any one of the first to fourth inventions, and the first structure is configured to adjust the amount of lubricating oil sucked into the first cylinder from the suction path. Provided is a lubricating oil supply system further including an adjusting unit.

  According to the present invention, it is possible to provide a lubricating oil supply system that not only eliminates the waste of a large amount of lubricating oil by performing only the necessary amount of oil injection at an optimal timing, but also has excellent reliability. In addition, it is possible to provide a lubricating oil supply system capable of adjusting the amount of discharged oil according to the required amount.

  Examples of the present invention will be described below. The relationship between the embodiments and the claims is as follows. The first embodiment mainly relates to claim 1, claim 2, claim 3, claim 4, claim 5, and the like. In addition, this invention is not limited to these Examples at all, and can be implemented in various modes without departing from the gist thereof.

<Overview>
A lubricating oil supply system according to the present invention includes a cam that is driven in synchronization with an engine piston, a first structure including a plunger that moves up and down in conjunction with the cam, a cylinder and the like, and is driven in synchronization with the cam and the piston of the engine. And a second structure including a cam, a cylinder, and the like. This system is the timing at which the lubricating oil delivery path from the first structure to the second structure and the lubricating oil discharge path from the second structure to the engine pass over the discharge port in the engine where the piston ring of the engine is connected to the discharge path. It is characterized in that it is configured to communicate with each other.

  In addition to the above, the lubricating oil supply system of the present invention is also configured such that the plunger of the first structure compresses the lubricating oil sucked into the cylinder by the forward path by the backward path and maintains the compressed state for a predetermined period. include. Further, in addition to the above, the structure in which the communication path of the cylinder of the second structure communicates with the discharge port in the engine while the compressed state is maintained by the plunger of the first structure is also the present invention. Included in the lubricant supply system.

<Configuration>
(General)
1A to 1C are transition diagrams of the lubricating oil supply system of the present invention, and each of “suction”, “maintenance”, and “discharge” of the lubricating oil (hereinafter simply referred to as “oil”) is shown. The structure of this system in the process is shown in a sectional view or a perspective view. Of these, FIG. 1A shows the respective configurations in the process of “suction”, FIG. 1B shows the “maintenance”, and FIG. 1C shows the “discharge” process. As described above, the lubricating oil supply system according to the present invention enables oil injection at an optimal timing by repeating the processes of “suction”, “maintenance”, and “discharge” of oil according to the configuration shown in each. First, the outline of the configuration of the lubricating oil supply system of the present invention will be described using FIG. 1A among these transition diagrams.
First, as shown in FIG. 1A, the “lubricating oil supply system” 0100 includes a “first structure” 0110 and a “second structure” 0120.

(First structure)
The “first structure” includes a “first cam” 0111, a “first cylinder” 0112, a “first plunger” 0113, a “suction path” 0114, and a “sending path with check valve” 0115. .

(First cam, first cylinder)
The “first cam” is configured to be driven in synchronization with the piston of the engine. The “first cylinder” is configured to temporarily hold the lubricating oil. Moreover, in the example of this figure, the coil spring 0116 is provided in the 1st cylinder, and it is comprised so that a 1st plunger may be urged | biased below. This is to enable the first plunger to move up and down smoothly in conjunction with the first cam described below. The downward urging may be performed by other means such as air pressure or hydraulic pressure.

(First plunger, suction path)
The “first plunger” is arranged in the first cylinder and configured to move up and down in conjunction with the first cam. The “suction path” is for sucking lubricating oil from the lubricating oil supply tank 0130 into the first cylinder in accordance with the vertical movement of the first plunger. In the example of this figure, a check valve 0131 is attached to the lubricating oil supply tank. This check valve is provided to prevent the lubricating oil from flowing back from the first cylinder side to the lubricating oil supply tank side. In addition, unlike the example of this figure, the check valve may be provided in the suction path.

(Oil quantity adjustment part)
Also, since the required amount of lubricating oil discharged toward the engine may vary depending on the shape of the piston of the engine, the lubricating oil supply system of the present invention is configured to be able to adjust this discharged oil amount. Is desirable. For this reason, the first structure of the lubricating oil supply system of the present invention preferably includes an “oil amount adjusting unit” for adjusting the amount of lubricating oil sucked into the first cylinder from the suction path. Specifically, as shown in FIG. 1A, for example, an “oil amount adjusting unit” 0140 having a coil spring attached to the upper portion of the first cylinder and a bolt and a double nut for adjusting the upper end position of the coil spring is provided. It is done. It is possible to adjust the amount of discharged oil by adjusting the amount of suction oil by the oil amount adjusting unit, and a specific configuration for that will be described later.

(Sending route with check valve)
The “delivery route with a check valve” is for delivering the lubricating oil sucked and held in the first cylinder in accordance with the vertical movement of the first plunger to the second cylinder side. The check valve 0117 is attached so that the lubricating oil does not flow backward from the second cylinder side to the first cylinder side.
Thus, the first cylinder is connected to the second structure through the delivery path with a check valve. Next, the configuration of the second structure will be described.

(Second structure)
The “second structure” includes “second cam” 0121, “second cylinder” 0122, “discharge path” 0123, and “second plunger” 0124.

(Second cam, second cylinder)
The “second cam” is configured to be driven in synchronization with the first cam and an engine piston (not shown). As described above, the “second cylinder” is a delivery destination when the lubricating oil in the first cylinder of the first structure is delivered through the delivery path with a check valve. In the example of this figure, a coil spring 0125 is also provided in the second cylinder, but this purpose is the same as that described for the first cylinder. The same applies to the point that the downward urging may be performed by air pressure or hydraulic pressure.

(Discharge route)
The “discharge path” is connected to the second cylinder and discharges lubricating oil toward the engine.

(Second plunger)
The “second plunger” moves up and down in conjunction with the second cam and is disposed in the second cylinder. In addition, the second plunger is connected to the delivery path of the first structure and the discharge path at a timing when the piston ring (not shown) of the engine passes over the discharge port in the engine connected to the discharge path. Is provided.

(Details of configuration in each process (1) Suction)
Based on the configuration outlined above, the configuration in each process of sucking, maintaining, and discharging the lubricating oil will be described in detail. First, the configuration in the suction process will be described.
As described above, the suction of oil into the first cylinder is performed from the lubricating oil supply tank through the suction path in accordance with the vertical movement of the first plunger. For this reason, the first plunger is shaped so that oil can be sucked into the first cylinder from the suction path by its vertical movement.

  FIG. 2 is a diagram illustrating an example of the shape of the first plunger. The first plunger of the present example has a cylindrical shape in which the top portion 0213a has a diameter equal to the inner diameter of the first cylinder 0212, and the body portion 0213b has a cylindrical shape having a diameter slightly shorter than the inner diameter of the first cylinder (a center not shown). Line coincides with the center line of the top of the head). By adopting such a shape, the first plunger is moved upward while the body portion faces (substantially closes) the first cylinder side opening surface 0214a of the suction path 0214, and the first plunger body portion and the first plunger Oil can be sucked from the suction path into a slight gap (indicated by hatching 0216) between the cylinders (note that the delivery path with check valve is not shown).

  Returning to FIG. 1A, this figure shows a state in which the first plunger moves upward with the body portion of the first plunger facing the first cylinder side opening surface of the suction path. The process which is attracting | sucking lubricating oil from the suction path in the clearance gap between a trunk | drum and a 1st cylinder is shown.

  Further, as described above, the lubricating oil supply system of the present invention preferably includes an oil amount adjustment unit for adjusting the amount of suction oil. In this case, for example, by adjusting the upper end position of the coil spring using bolts and double nuts that constitute the oil amount adjustment unit, the uppermost position when the first plunger moves upward can be adjusted, thereby It is possible to adjust the amount of lubricating oil sucked from the suction path into the gap between the body portion of the first plunger and the first cylinder. Then, as will be described later with reference to FIG. 4, in the lubricating oil supply system of the present invention, a process is repeated in which the same amount of oil sucked during suction is discharged during discharge. By adjusting the amount, the discharge amount can be adjusted.

(Details of configuration in each process (2) Maintenance)
Next, the configuration in the maintenance process will be described.
FIG. 1B shows a configuration in the “maintenance” process of the lubricating oil in the transition diagram of the lubricating oil supply system of the present invention. In this process, the first plunger moves down in the first cylinder. Therefore, the lubricating oil in the first cylinder is pressurized while being pushed by the first plunger. As a result, pressure is also applied to the opening surface on the first cylinder side of the suction path, but the check oil is provided in the suction path and the like so that the lubricating oil in the first cylinder does not flow back to the suction path. .

  Further, pressure is also applied to the opening surface on the first cylinder side of the delivery path with check valve, but the lubricating oil in the first cylinder does not flow out to the delivery path with check valve. This is realized by the following configuration. That is, as described above, the second plunger is provided with a communication path that connects the delivery path and the discharge path of the first structure at the timing when the piston ring of the engine passes over the discharge port in the engine connected to the discharge path. Yes. In the maintenance process, since this communication passage is not the timing for connecting the delivery path and the discharge path of the first structure, the second cylinder side opening surface of the delivery path is blocked by the second plunger. ing. For this reason, the oil in the delivery path does not flow into the second cylinder, and the oil in the first cylinder does not flow into the delivery path.

  As a result, in this maintenance process, the oil in the first cylinder is pressurized without reducing the amount of oil sucked in the suction process. When such a configuration is realized by the first plunger having the shape as shown in FIG. 2, the first plunger sucks the lubricating oil while ascending in the first cylinder, and then in the first cylinder. The sucked lubricating oil is compressed while descending.

  In addition, since there is a certain limit based on the volume of oil in the pressurization of oil, after reaching this limit, the first plunger does not move any further and stops at that position. May be. This stop state is realized by the balance between the downward force applied from the first plunger and the oil pressure. In this case, the lowest point of the first plunger may be rotatably connected to the first cam, or the first plunger may be pressed against the first cam by an urging force against the first plunger without being connected. One plunger may be configured to move up and down. However, since the downward force applied from the first plunger and the oil pressure are balanced during the stop, the lowest point of the first plunger may not necessarily be in contact with the first cam. .

  Thus, the first plunger of the lubricating oil supply system of the present invention sucks the lubricating oil into the first cylinder by the forward path, and then compresses the lubricating oil sucked and held in the first cylinder by the backward path, You may be comprised so that a compression state may be maintained for a predetermined period.

(Details of configuration in each process (3) Discharge)
(General)
Next, the configuration in the ejection process will be described.
FIG. 1C shows a configuration in the “discharge” process of the lubricating oil in the transition diagram of the lubricating oil supply system of the present invention. In this process, the first plunger remains stopped after being lowered in the maintenance process.

  On the other hand, in this discharge process, the communication path between the delivery path and the discharge path is the timing for connecting both paths. For this reason, the pressure applied to the first cylinder side opening surface of the delivery path with check valve causes oil in the first cylinder to be delivered to the second cylinder side through the delivery path with check valve, It is connected to the second cylinder via the discharge path and discharged toward the engine. As described above, the second plunger moves up and down in conjunction with the second cam so that the communication path contacts at the timing when the piston ring of the engine passes over the discharge port in the engine connected to the discharge path. It is configured. As a result, oil is discharged to the engine at an optimal timing.

  FIG. 3 is a view showing an example of the appearance of the piston ring of the engine. In this figure, piston rings 0302 to 0305 are portions that are in direct contact with the inner wall 0301a of the cylinder 0301. Accordingly, the oil is discharged toward the engine at a timing when the range L from the upper end to the lower end of the piston ring passes over the engine discharge port 0306. A specific example of a specific discharge procedure is to discharge at a discharge amount of 0.4 cc or less, a discharge time of 0.015 seconds, and a discharge pressure of 20 bar.

  Further, the amount of oil discharged in this discharge process is the same as the amount of oil sucked in the suction process. This is because the oil is sucked into the first cylinder in the suction process, and this is pressurized by the lowering of the first plunger to increase the pressure in the first cylinder, and then required to return to the pressure before suction in the discharge process. This is because an amount of oil is discharged, but the amount of oil necessary to return to the pressure before suction is the same as the amount of oil sucked.

  FIG. 4 is a conceptual diagram illustrating an example of a change in hydraulic pressure from suction to discharge. Among these, Fig.4 (a) shows the state at the time of attraction | suction. Here, it is assumed that the amount of oil indicated by the height H is present in the cylinder 0412 before suction, and the hydraulic pressure is 1 atm. Assume that the amount of oil indicated by the height h is further sucked by the rise of the plunger 0413. At this stage, the oil pressure is still 1 atm and there is no change. Next, (b) shows the state at the time of maintenance. At this stage, the oil in the cylinder 0412 is pushed down and compressed by the lowering of the plunger 0413, and the hydraulic pressure rises to 1.5 atm, for example. (C) shows the state at the time of discharge. At this time, the communication passage (not shown) is opened, so that the oil in the cylinder 0412 is sent out from the delivery path 0415. The amount of oil delivered at this time is an amount sufficient for the hydraulic pressure to return to 1 atmosphere. As a result, the state after discharge becomes a state where the same amount of oil as that before suction is present in the cylinder with the same hydraulic pressure, and this cycle is repeated again with the state after discharge as the state before suction. That is, the process is repeated in which the same amount of oil sucked during suction is discharged during discharge. By such a process, it is possible not only to lubricate at an optimal timing, but also to lubricate only a necessary amount, and from this point, the waste of lubricating oil can be eliminated.

(Communication passage)
As described above, lubrication of only the required amount at the optimum timing can be realized by configuring the communication path of the delivery path and the discharge path provided in the second plunger to communicate both paths only at a predetermined timing. It becomes. Therefore, details of the configuration of the “connection path” will be described next.

  FIG. 5 is a diagram illustrating an example of the shape of the communication passage. As shown in FIG. 5A, the connection path 0525 of this example is provided as a through hole that penetrates the side surface of the second plunger 0522 in the diametrical direction. The vertical cross section of the through hole is substantially circular, and its area is slightly smaller than the areas of the vertical cross sections of the delivery path (not shown) and the discharge path 0523. The size relationship between the cross-sectional area of the through hole and the cross-sectional areas of the delivery path and the discharge path is not particularly limited. FIG. 5B is a plan perspective view of the communication passage 0525 viewed from the direction of arrow A in FIG.

  By making the shape of the communication passage in this way, when the second plunger moves up in the second cylinder, the communication passage eventually overlaps the delivery route and the discharge route, while oil passes through the communication passage and the discharge route. Can be discharged to the engine. When the second plunger continues to rise, the communication passage again does not overlap the delivery path and the discharge path, the communication is interrupted, and the oil discharge to the engine is completed.

  FIG. 6 is a conceptual diagram illustrating a process in which the communication path and the discharge path overlap for reference. In this example, the area of the vertical cross-section of the substantially circular through hole is slightly smaller than the area of the vertical cross-section of the discharge path, and the overlap between the two is viewed in the direction of arrow B in FIG. Although this example shows the overlap of the communication path and the discharge path, the same applies to the overlap of the communication path and the delivery path.

  First, FIGS. 6A to 6G show a process from the start to the end of the overlap of the communication passage 0601 and the discharge passage 0602. That is, when the second plunger is raised, the communication passage provided in the second plunger is also raised, begins to overlap with the discharge passage from the lower direction, and finally departs upward, and the overlapping ends. Specifically, (a) is a time when overlap begins, (b) is a time when partially overlapped, (c) is a time when complete overlap is started, and (d) is an intermediate point (communication path) of complete overlap. (E) shows the time when complete overlap is completed, (f) shows the time when it partially overlaps again, and (g) shows the time when it no longer overlaps at all.

  Further, (h) is a graph showing the amount of oil discharged during the period corresponding to each time point (a) to (g) shown above. As a result, by synchronizing the timing at which the piston ring of the engine passes over the discharge port in the engine, for example, from (c) to (e), wasteful discharge can be performed from (a) to (c) and from (e). It is possible to perform discharge at an optimum timing while keeping the minimum to (g).

(Other)
After performing the processing in the discharge process described above, the lubricating oil supply system returns to the suction process again and thereafter repeats the processes of “suction”, “maintain”, and “discharge” many times. At that time, when returning from the discharge process to the suction process, the communication passage once performed above the delivery route / discharge route passes from the top to the bottom while overlapping with the delivery route / discharge route again by the lowering of the second plunger. It will be. At this time, in order to smoothly execute the process of sucking a constant amount and discharging the same amount as described above, it is necessary to prevent the oil in the discharge path from flowing back through the communication passage. Therefore, it is desirable that a check valve for preventing such a backflow is provided on the opening surface of the discharge passage on the communication passage side.

(Synchronization of the first structure and the second structure)
By the way, the communication path between the delivery path and the discharge path is in communication with the timing when the piston ring of the engine passes over the discharge port in the engine, and at that moment, the oil in the first cylinder is sent to the delivery path by hydraulic pressure. In order to realize such a configuration, it is indispensable that the first plunger constituting the first structure, the second plunger constituting the second structure, and the piston ring of the engine move synchronously. Therefore, the lubricating oil supply system of the present invention is configured such that the first cam for driving the first plunger, the second cam for driving the second plunger, and the piston of the engine move in synchronization with each other. The

  FIG. 7 is a view for explaining a state in which the first plunger and the second plunger move in synchronization with such a configuration. In this figure, the vertical movement of the first plunger is shown in the lower half of the vertical axis, for example, at the position of the lower end of the crown. The vertical movement of the second plunger is shown in the upper half of the vertical axis, for example, at the position of the upper end of the communication passage. In addition, the positions indicated by diagonal lines in the upper half of the vertical axis indicate the positions of the delivery path and the discharge path. In addition, although time is shown on the horizontal axis, these times are distinguished from time zone a to time zone g for convenience. In this figure, the time “zero” is set to a point where the first plunger starts to compress the lubricating oil sucked and held.

  First, in the time zone a, as shown in the lower half of the figure, the first plunger descends and the lubricating oil sucked and held in the first cylinder is compressed. At this time, as shown in the upper half of the figure, the second plunger is in a state where it does not move while being lowered downward.

  Next, in the time zone b, the first plunger stops descending and maintains the compressed state for a predetermined period while remaining in that position. This “predetermined period” is until the communication passage is in contact, and in this figure, the period is a period obtained by combining the time zone b and the time zone c described below. Note that the second plunger is still in a state where it is lowered and does not move.

  Next, in the time zone c, the first plunger is still in the lowered position, but the second plunger starts to rise. However, the communication passage provided in the second plunger is not yet overlapped with the discharge path and the like, and therefore the pressurized state by the first plunger is continuously maintained.

  Next, in the time zone d, the first plunger remains in the lowered position. On the other hand, the second plunger continues to rise, and the communication passage overlaps with the discharge passage and the like. For this reason, the oil maintained in the compressed state by the first plunger is sent to the delivery path by the communication of the communication path, and after passing through the communication path between the delivery path and the discharge path, the oil is directed from the discharge path to the engine. Discharged. Therefore, in this case, the communication passage is communicated within a predetermined period in which the compressed state is maintained by the first plunger.

  Next, in the time zone e, the first plunger continues to rise, and leaves the state where the communication passage overlaps the discharge passage and the like. For this reason, the discharge of oil toward the engine is stopped.

  Next, in the time zone f, both the first plunger and the second plunger remain stopped.

  Next, in the time zone g, the first plunger starts to rise, and the second plunger starts to fall in synchronization therewith. Then, the state at the end of the time zone g becomes the state at the beginning of the time zone a again, and thereafter these processes are repeated.

  In addition, since there exists a limit resulting from the volume of oil in the press of the oil by a 1st plunger, the restriction | limiting may be provided in the lower limit position of the up-and-down movement of a 1st plunger. For this reason, the lubricating oil supply system of the present invention may further include a lower limit setting unit that sets a lower limit during the vertical movement of the first plunger. The example of this figure is also an example in which the lower limit when moving up and down is set in the first plunger. This lower limit may be selectively provided at different positions. Also in the example of this figure, these several choices are shown with the continuous line and the broken line, and it is shown that what was shown with the continuous line with the highest minimum position among these is set. Moreover, it becomes possible to adjust discharge oil quantity by comprising so that the lower limit position of a 1st plunger can be adjusted in this way.

  The synchronized movement of the first plunger and the second plunger as described above is ensured by causing the first cam that drives the first plunger and the second cam that drives the second plunger to move synchronously. . This synchronization can be performed using known techniques.

  As described above, the present invention is characterized in that lubricating oil is injected at an optimum timing mechanically by using a plunger driven by a cam. With this configuration, unlike a conventional electromagnetic valve control method, it is possible to provide a highly reliable apparatus with few failures.

<Effect>
According to the invention of the present embodiment, it is possible to provide a lubricating oil supply system that not only eliminates the waste of a large amount of lubricating oil but also provides excellent reliability by injecting only a necessary amount at an optimal timing. Become. In addition, it is possible to provide a lubricating oil supply system capable of adjusting the amount of discharged oil according to the required amount.

The figure which showed the structure in a "suction" process among the transition diagrams of the lubricating oil supply system of this invention The figure which showed the structure in the "maintenance" process among the transition diagrams of the lubricating oil supply system of this invention The figure which showed the structure in a "discharge" process among the transition diagrams of the lubricating oil supply system of this invention The figure which shows an example of the shape of a 1st plunger The figure which shows an example of the appearance of the piston ring of an engine Conceptual diagram showing an example of changes in hydraulic pressure from suction to discharge A diagram showing an example of a contact route Conceptual diagram showing the process in which the communication passage and discharge route overlap The figure for demonstrating a mode that a 1st plunger and a 2nd plunger move synchronously

Explanation of symbols

0100 Lubricating oil supply system 0110 1st structure 0111 1st cam 0112 1st cylinder 0113 1st plunger 0114 Suction path 0115 Sending path 0116 with check valve Coil spring 0117 Check valve 0120 2nd structure 0121 2nd cam 0122 2nd cylinder 0123 Discharge path 0124 Second plunger 0125 Coil spring 0130 Lubricating oil supply tank 0131 Check valve 0140 Oil amount adjustment unit

Claims (5)

A first cam that is driven in synchronism with the piston of the engine;
A first cylinder for temporarily holding lubricating oil;
A first plunger disposed in the first cylinder and moving up and down in conjunction with the first cam;
A suction path for sucking lubricating oil from the lubricating oil supply tank into the first cylinder according to the vertical movement of the first plunger;
A delivery path with a check valve for delivering the lubricating oil sucked and held in the first cylinder to the second cylinder according to the vertical movement of the first plunger;
A first structure consisting of
A second cam driven in synchronization with the first cam and the piston of the engine;
A second cylinder,
A discharge path connected to the second cylinder for discharging lubricant toward the engine;
The timing when the piston ring of the engine passes over the discharge port in the engine connected to the discharge path through the delivery path and discharge path of the first structure while moving up and down in conjunction with the second cam. A second plunger provided with a communication path to communicate with,
A second structure consisting of
Lubricating oil supply system with.   The first plunger is configured to suck the lubricating oil into the first cylinder by the forward path, and then compress the lubricating oil sucked and held in the first cylinder by the backward path and maintain the compressed state for a predetermined period. The lubricating oil supply system according to claim 1.   3. The lubricating oil supply system according to claim 2, wherein the communication path of the second cylinder communicates with the discharge port in the engine within a predetermined period in which the compressed state is maintained by the first plunger.   The lubricating oil supply system according to any one of claims 1 to 3, further comprising a lower limit setting unit that sets a lower limit when the first plunger moves up and down.   The lubricating oil supply system according to any one of claims 1 to 4, wherein the first structure further includes an oil amount adjusting unit for adjusting the amount of lubricating oil sucked into the first cylinder from the suction path.

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