JPS61126314A - Lubrication oil pump in internal combustion engine - Google Patents

Abstract

PURPOSE:To provide a lubrication oil pump having an extremely simple and miniature structure and a high oil feed efficiency, by slidably fitting a shaft rod extended from the head of a piston in a bottomed seal hole formed in a cylinder head. CONSTITUTION:A shaft rod 16 extended from the head of a piston 3 is slidably fitted in a bottomed seal hole 17 formed in a cylinder head 1. An oil feed pipe 36 is connected from an oil tank 35 to the seal hole 17 through a check valve 37, and the seal hole 17 is connected to an oil reservoir 38 through a check valve 39 by means of an oil feed pipe 40. With this arrangement, lubrication oil may be fed to moving parts in the internal combustion engine.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lubricating oil pump for internal combustion engines, and more particularly to a lubricating oil pump that utilizes reciprocating motion of a piston.

[Prior art]

Conventionally, a lubricating oil pump for supplying lubricating oil to each moving part of an internal combustion engine has been installed separately outside the internal combustion engine and operated using the movement of the internal combustion engine.

[Problem that the invention seeks to solve]

However, since conventional lubricating oil pumps were installed outside the internal combustion engine, the overall size of the internal combustion engine became large, and the pumps were installed in a narrow engine room, making it difficult to install them in relation to other engines such as radiators and cleaners. - They were subject to various constraints due to their limited space.

Furthermore, since it is provided separately from the internal combustion engine, it is necessary to adjust the timing of the operation, etc., and various efforts are required in terms of support and maintenance.

[Means for solving problems]

The present invention directly utilizes the reciprocating power of the piston.

The purpose of the present invention is to provide a lubricating oil pump for internal combustion engines that is small in size and has high oil feeding efficiency.

That is, 1) the lubricating oil pump for an internal combustion engine of the present invention has a shaft rod extending in the direction of movement of the piston at the head of the piston, which is reciprocally fitted into a seal hole having a bottom formed in the cylinder; A lubricating oil tank is connected to the vicinity of the bottomed part of the seal hole through a first check valve, and a lubricating oil tank is connected to the moving part of the internal combustion engine through a second check valve in the vicinity of the bottomed part of the seal hole. When the piston is connected and the tip of the shaft moves away from the bottomed part, the first check valve is activated and the lubricating oil flows into the hole, causing the tip of the shaft to move away from the bottomed part. When approached, the second check valve is activated and the lubricating oil in the seal hole is sent to the moving part.

〔Example〕

Hereinafter, two embodiments in which the present invention is applied to a free-piston type two-stroke internal combustion engine will be described in detail with reference to one drawing.

Referring to FIG. 1, the illustrated internal combustion engine has a main cylinder 1 and an auxiliary cylinder 2 arranged and fixed adjacent to the main cylinder 1 on the same axis. A main piston 3 and an auxiliary piston 4 are arranged in both cylinders 1.2 and are movable in the axial direction.

Both pistons 3 and 4 are connected by a connecting rod 5 extending through the partition walls of both cylinder chambers, so that they move simultaneously in the same direction within their respective cylinders. Further, the piston 4 is provided with an output shaft 6 that extends in the axial direction to the outside of the sub-cylinder 2 in a direction opposite to the connecting rod 5.

One cylinder chamber of the main piston 3 in the main cylinder 1, that is, the cylinder chamber on the opposite side to the sub cylinder 2 side, is connected to the main combustion chamber 7.
shall be. For this reason, yi*he*hoa+
i*etxs<be'a=y−"° j, an exhaust port 9 for discharging the burned gas is formed in the cylinder chamber of this main combustion chamber 7. A spark plug 10 is provided for the main combustion chamber 7 to ignite the air-fuel mixture.

The positional relationship between the intake port 8, the exhaust port 9, and the two spark plugs 10 is the same as in a normal two-stroke engine. That is, the exhaust port 9 and the ignition glove 10 are located at the first part of the cylinder 6, and the intake port 8 is located at the position where the main piston 3 retreats and the main combustion chamber becomes the maximum (hereinafter, this position of the main piston will be referred to as bottom dead center). When the engine reaches the vicinity of the main combustion chamber 7, the combustion chamber 7 is in communication with the main combustion chamber 7.

In this embodiment, the intake port 8 is not directly connected to the carburetor 12 because the cylinder chamber 11 on the opposite side of the main combustion chamber 7 of the main piston 3 is used as a pump for feeding the mixture pressure. That is, the outlet side of the carburetor 12 is connected to the main piston 3.
When the main piston reaches a position where the volume of the main combustion chamber 7 is narrowest (hereinafter this position of the main piston is referred to as top dead center), the main piston is connected to the cylinder chamber 11 (hereinafter referred to as the mixture pump chamber). Connected to cylinder 1. On the other hand, main piston 3
The suction port 8 is communicated with an opening 13 provided in the wall of the mixture pump chamber 11 at a position near the bottom dead center of the pump. The communication pipe 14 connecting the intake port 8 and the opening 13 may be formed within the cylinder wall, or may be formed as piping outside the cylinder.

The carburetor 12 is similar to a known one, and includes a nozzle 121 in the middle of an air supply pipe that spouts fuel sent from a fuel tank (not shown).

According to the above configuration, the air-fuel mixture from the carburetor 12 is transferred into the air-fuel mixture pump chamber 11 when the main piston 3 moves toward the top dead center side (towards the left in the figure) during the reciprocating movement of the main piston 3. supplied to Subsequently, as the main piston 3 moves toward the bottom dead center (towards the right in the figure), the air-fuel mixture in the pump chamber 11 is compressed and is forced into the communication pipe 14 through the opening 13, and the main piston 3 moves toward the bottom dead center. When the intake port 8 that communicates with the main combustion chamber 7
from there into the main combustion chamber 7.

When the air-fuel mixture supplied into the pump chamber 11 moves toward the bottom dead center of the main piston 3, it is connected to the connection part between the carburetor 2 and the pump chamber 11 so that it does not flow back to the carburetor 12 side. Stop valve 1
5 is provided.

exhaust? In order to control the opening and closing of the gate 9, a stepped rod 16 is provided which extends from the main piston 3 into the cylinder wall in a direction opposite to the piston rod 5.

This stepped rod 16 has a large diameter portion 16a on the side attached to the main piston 3 and a small diameter portion 16b extending from the large diameter portion 16a, and a stepped portion 16c (in the illustrated embodiment, a chi ). The main cylinder 1 has a head block 1a extending forward in its head portion.
A hole 17 into which the large diameter portion 16a loosely fits is provided extending from the inner wall of the cylinder chamber into the head block la.

An exhaust port 9 is provided in the head block 1a so as to communicate with this hole 17.

The large diameter portion 16a of the stepped rod is fitted into the hole 17 when the main piston 3 is at the top dead center side as shown in the figure, thereby blocking communication between the exhaust port 9 and the main combustion chamber 7. . When the main piston 3 moves to the bottom dead center side.

Before reaching the bottom dead center, the large diameter portion 16a has a stepped portion 16c.
The entire combustion chamber up to the part shown in FIG.

When the main piston 3 moves to the bottom dead center, the small diameter portion 16b
A portion of the fuel is drawn out into the main combustion chamber. As a result, as shown in FIG. 2, the hole 17 in the cylinder wall communicates with the main combustion chamber 7 along the small diameter portion 16b and the stepped portion 16c, and as a result,
Exhaust port 9 also communicates with main combustion chamber 7 via hole 17.

Thus, the combustion gases in the main combustion chamber are exhausted through the holes 17 and out the exhaust port 9.

Returning to FIG. 1, in the auxiliary cylinder 2, the cylinder chamber on one side of the auxiliary piston 4, that is, the cylinder chamber on the opposite side of the main cylinder 1 with respect to the auxiliary piston 2, is used as an auxiliary combustion chamber 18. This auxiliary combustion chamber 18 also has an intake port 19 . An exhaust port zo and two spark plugs are installed.

In the sub-cylinder 2, the cylinder chamber on the main cylinder 1 side with respect to the sub-piston 4 is used as an air supply pump chamber 22, as will be described later, and as a combustion chamber 7', the air-fuel mixture from the carburetor is used. 1 chair, main combustion chamber 7
The intake port 19 is directly connected to the exhaust port 9 of the main combustion chamber 7 through the guide f 23 because the exhaust gas combusted in the combustion chamber 7 is used (actually, the unburned air-fuel mixture is combusted).

Similar to the exhaust port 9 in the main combustion chamber 7, the exhaust port 20 is provided so as to communicate with an axial hole 24 provided in the cylinder head, and the output shaft 6 extends through this hole 24. There is. The output shaft 6 is similar to the single-stage rod 16,
It has a large diameter part 6a connected to the auxiliary screw or tongue 4 and a small diameter part 6b following it, and has a stepped part 5c (tapered) at the connection part. The hole 24 has an inner diameter into which the output shaft 6a fits snugly. The length of the large diameter portion 6a is such that when the auxiliary piston 4 moves to the position where the auxiliary combustion chamber 18 is widened to the maximum (hereinafter referred to as bottom dead center), the large diameter portion 6a is completely inserted into the auxiliary combustion chamber 18 as shown in the figure. The length is the length that can be pulled out. This result 2
The auxiliary combustion chamber 18 is connected to the exhaust port 20 through a gap between the stepped portion 6c and the small diameter portion 6b and the inner diameter surface of the hole 24. Therefore, the gas burned in the sub-combustion chamber 18 is discharged into the atmosphere from the exhaust port 20 through the muffler 25.

In addition to this, the exhaust gas from the main combustion chamber 7 that has passed through the Tsukuino 23 is sucked into the auxiliary combustion chamber 18 via the intake port 19. The subsequent movement of the secondary piston 4 toward the top dead center (rightward in the figure) causes the large diameter portion 6a of the output shaft 6 to fit into the hole 24, and then the gas in the secondary combustion completion 8 is compressed. When the sub piston 4 reaches its top dead center,
If the ignition glove 21 is ignited by energizing the ignition glove 21 at or near that point, the unburned air-fuel mixture in the compressed gas will cause explosive combustion.

In order to prevent intake gas from flowing back toward the main combustion chamber through the intake port 19 when the secondary piston 4 moves to the top dead center side, it is A stop valve 26 is provided. In this embodiment, the check valve 26 is provided in the middle of the noigu 23, and the check valve 26
A gas reservoir 27 connected to the combustion chamber 23 is provided between the intake port 19 and the intake port 19 to adjust the gas flowing into the auxiliary combustion chamber 18.

In the above configuration, the carburetor 1 is reciprocated with the output shaft 6 from the starter mechanism described later or externally
The air-fuel mixture from 2 is introduced into the main combustion chamber 7 from the intake port 8 via the pump chamber 11 and compressed. When the spark plug 10 is energized during compression.

The compressed mixture explodes and burns. As a result, the main piston 3 moves toward the bottom dead center, and at the same time, the sub piston 4 moves toward the top dead center. At this time, the large diameter portion 16a of the two-stepped rod 16 is pulled out into the main combustion chamber 7, so that the combusted gas passes through the hole 17 and is sent out from the exhaust port 9 to the pipe 23.

When this operation is repeated due to the action of the starter.

The exhaust gas in the pipe 23 is sent into the sub-combustion chamber 18,
As the main piston 3 moves toward the bottom dead center due to explosive combustion in the main combustion chamber 7, the auxiliary piston 4 moves toward the top dead center and is compressed. The combustion mixture explodes and burns. As a result, the sub-piston 4 is moved toward the bottom dead center, and therefore the main piston 3 is moved toward the top dead center. Thereafter, this operation is repeated, and explosive combustion is alternately repeated in the main combustion chamber 7 and the sub-combustion chamber 18, so that the main piston and the sub-piston reciprocate simultaneously. This reciprocating motion can be extracted from the output shaft 6.

Next, the starter mechanism used in this embodiment will be described.

A compression spring 28 is arranged around the piston rod 5 in the pump chamber 11 of the main cylinder.

The main piston 3 is always biased towards the top dead center side.

A compressed gas (compressed air) jet nozzle 29 that opens into the main combustion chamber 7 is provided in the head portion of the main cylinder, and an external compressed gas container 30 is connected to this jet nozzle by a pipe 31. Tsuya Eve 31 has cock 32 on the way
A valve mechanism that opens and closes in conjunction with the movement of the main piston 3 is provided between the cock 32 of the screw f31 and the nozzle 29.

This valve mechanism is formed using a small diameter portion 16b at the tip of the stepped rod 16 and a hole in the head block la that receives the small diameter portion 16b. That is, referring to FIGS. 1 and 3, the head block 1a includes the stepped rod 16 described above.
following the hole 17 received in the large diameter portion 16a' of.

A small diameter hole 33 is formed through which the small diameter portion 16b passes,
The pie f31 opens into this small diameter hole 33 in the middle. These openings are shown as 31a and 31b in FIG. This small diameter hole 3
The small diameter portion 16b in 3 has a notch 34 along the axial direction.
is formed. That is, when the main piston 3 is within a predetermined distance from its top dead center to its bottom dead center, the hole opened in the small diameter hole 33 and the openings 31a and 3Ib on the upstream side and downstream side of the tube 31 are in this position. The connection is made through the notch 34.

Therefore, when starting this engine, the cock 3 is in the state shown in Figure 2.
2, compressed gas flows from the compressed gas container 30 through the pipe 31 and the notch 34 of the stepped rod 16, which is a valve mechanism, to the jet nozzle 29, and is jetted into the main combustion chamber 7. . As a result, the pressure of this compressed gas causes the main piston to
moves to the bottom dead center side. This movement causes the notch 34 of the stepped rod 16 to open. 31, the small diameter portion of the two-stepped rod 16 closes the space between the openings 31a and 31b of the Tsuquib 31, and the supply of compressed gas to the main combustion chamber 7 is stopped. On the other hand, as the main piston 3 moves toward the bottom dead center, the stepped portion 16c is drawn into the main combustion chamber 7.

An exhaust port 9 is connected to the main combustion chamber 7 via a hole 17. As a result, the compressed gas in the main combustion chamber 7 flows out through the exhaust port 9, and the restoring force of the spring 28 moves the main piston 3 toward the top dead center. With this, υ stepped rod 1
The notch 34 of 6 is again the both openings 31a of Tsukibu 3,
Upon returning to the position facing 31b, the compressed gas is again supplied to the jet nozzle 29 and into the main combustion chamber 7. On the other hand, as the main piston 3 moves toward the top dead center side, the large diameter portion 16a of the stepped rod 16 penetrates into the hole 17, blocking communication between the exhaust port 9 and the main combustion chamber 7. Therefore, the pressure within the main combustion chamber 7 rises rapidly. In this way, the reciprocating motion of the main piston 7 is repeated. During this time, the air-fuel mixture is sucked into the main combustion chamber 7 from the intake port 8.

If the spark plug 10 is intermittently energized in accordance with the reciprocation of the main piston, it will ignite and cause explosive combustion when the concentration of the air-fuel mixture in the main combustion chamber 7 reaches a certain level.

Thereafter, as described above, this combusted exhaust gas is sent into the auxiliary combustion chamber 18, where it is compressed and begins explosive combustion. At this point, the start of the engine is completed, so the cock 32 is closed and the engine continues to operate.

As is clear from the above description, in this engine, the reciprocating motion of the piston is maintained by alternately causing explosive combustion in the main combustion chamber 7 and the auxiliary combustion chamber 18.

Generally, in an internal combustion engine, oil is supplied to each part of the engine to also cool the two engines. Usually, for this refueling,
A separate oil pump is provided.

In the engine of the embodiment shown in FIG.

Since it is necessary to use an oil pump separate from the ennon, a pump mechanism for pumping lubricating oil under pressure by the reciprocating movement of the piston is constructed in the cylinder head block 1a.

That is, with reference to FIGS. 1 and 4, the tip of the hole 17 in the head block l package into which the tip of the small diameter portion 16b of the single-stepped rod 16 is fitted is sealed from the outside into a hole 17'. The oil supply pipe 36 from the oil tank 35 is connected to this seal hole 17' via a check valve 37, and the same seal hole 17' is connected to the oil reservoir 38 via a check valve 39 by an oil supply pipe 4o. Connected. Oil supply pipes 36 and 4
o is connected to the seal hole 17' at the tip of the small diameter portion of the stepped rod 16 when the main piston 3 is at the top dead center as shown.

When the connection is completely cut off and the main piston moves toward the bottom dead center, the connection is established.

The check valves 37 and 39 are both spherical valve bodies 37d.

391 and springs 372, 392, when the seal hole 17' becomes high pressure, the check valve 37 closes and the check valve 39 opens, and when the seal hole becomes low pressure, the check valve 3 closes.
7 is opened, and the check valve 39 is closed.

Therefore, when the main piston 3 moves toward the bottom dead center from the top dead center shown in FIG. )
Since the pressure in the seal hole 17' becomes low, the check valve 37 opens and lubricating oil from the oil tank 35 flows into the seal hole 17'.
inhaled into the body. Next, when the main piston 4 moves from the bottom dead center toward the top dead center, the seal hole 17' is reduced, resulting in high pressure. Therefore, while the check valve 37 is closed, the check valve 39 is opened, and the lubricating oil sucked into the seal hole 17' is forced into the oil reservoir 38 through the oil supply pipe 40.

In this way, lubricating oil is pumped from the oil tank 35 to the oil reservoir 38 by the reciprocating movement of the main piston.

The oil reservoir 38 is connected to an oil distributor 41.

A fuel supply pipe 42 is branched from there and connected to various parts of the engine. Therefore, the lubricating oil that is force-fed to the oil reservoir 38 is transferred to the oil distributor 41. Passing through each oil supply pipe 42,
Supplied to each part of the engine.

After the supplied lubricating oil lubricates each part, it is returned to the oil tank 35 through the entire return pipe 43.

A portion of the lubricating oil supplied to the carburetor 12 mixes into the air-fuel mixture, enters the cylinder 1, lubricates the sliding surface of the piston, and burns together with the air-fuel mixture, leaving an excess amount in the return pipe 43.
It goes all the way through and returns to the oil tank 35.

In FIG. 1, 44 is an ignition circuit for the ignition glove 10°21. Reference numeral 45 denotes an air cleaner for sucking outside air, which is connected to the pump chamber of the sub-piston 4 of the sub-cylinder 2, and the drawn-in outside air is pumped through the air supply pipe 46 and the cooler by the action of one ring of the sub-piston 4. vaporizer 12 via 47
will be paid additionally.

Above, the case where the present invention is applied to a special free piston type two-stroke engine has been described, but the present invention is based on the present invention. It goes without saying that the oil pump function can be applied to normal 2-stroke and 4-stroke engines.

〔Effect of the invention〕

As described above, one aspect of the present invention is to slidably fit a shaft rod extending from the head of a piston into a seal hole having a bottom formed in a cylinder head, and to move the shaft rod into the seal hole by the movement of the piston. reciprocating motion, i.e.

The piston moves, and the pressure (positive pressure, negative pressure) generated by the piston movement is used to send lubricating oil to each moving part of the internal combustion engine, so the structure is extremely simple, small, and small. It is possible to provide a lubricating oil pump for an internal combustion engine that operates reliably and has good oil feeding efficiency.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing one embodiment of the present invention, Fig. 2 is an enlarged sectional view of the main part to explain exhaust gas from the main combustion chamber, and Fig. 3 is a valve that controls compressed air for the starter mechanism. FIG. 4 is an enlarged cross-sectional view showing the lubricating oil pressure feeding impulsion mechanism. 1...Main cylinder, 2...Sub-cylinder, 3...Main piston, 4...Sub-piston, 5...Connecting rod, 6...
output shaft. 7... Main combustion chamber, 8... Intake port, 9... Exhaust port 10... Spark plug, 12... Carburetor, 18
... Sub-combustion chamber, J9... Intake port, 20... Exhaust port, 21... Spark plug, 23... Pipe, 1
6...Stepped rod (shaft stop valve, ten umbrellas...second check valve. Figure 2, Figure 3, Figure 4)

Claims (1)

[Claims] 1. In an internal combustion engine in which a piston moves reciprocally, a shaft rod extending in the direction of movement of the piston is fitted into a seal hole formed in a cylinder and has a bottom so as to be able to reciprocate. At the same time, a lubricating oil tank is connected to the vicinity of the bottomed portion of the seal hole via a first check valve, and a lubricating oil tank is connected to the internal combustion engine near the bottomed portion of the seal hole via a second check valve. When the tip of the shaft rod separates from the bottomed part due to the movement of the piston, the first check valve is activated and the lubricating oil flows into the seal hole, causing the tip of the shaft rod to move away from the bottomed portion. When approaching the bottom, the second
A lubricating oil pump for an internal combustion engine, characterized in that the check valve operates to send lubricating oil in the seal hole to the moving part.