JPH0629533B2 - Lubricating device for internal combustion engine - Google Patents

Description

The present invention relates to a lubricating device for an internal combustion engine.

As one of the lubricating devices for internal combustion engines used for outboard motors and the like, there is a separate lubricating device that supplies lubricating oil to each part of the engine from a system separate from fuel by an oil pump.

Conventionally, as the above-mentioned lubricating device, for example, as shown in the specification and drawings attached to the Japanese Patent Application No. Sho 58-94108, the suction port connected to the oil chamber that performs the pumping action of the oil pump, through the suction pipe. A lubricating device is used in which an oil tank is connected and an intake pipe line of an engine is connected to a discharge port connected to the oil chamber of an oil pump via a discharge pipe.

Here, in the above-mentioned lubrication device, between the oil chamber of the oil pump and the discharge port, it is opened only by the discharge pressure in the oil chamber without opening due to the negative pressure in the intake pipe, and from the discharge port side to the oil chamber side. A check valve that prevents the reverse flow of lubricating oil to the oil supply stabilizes the discharge pressure and flow rate of the lubricating oil discharged from the oil chamber, and ensures that the amount of lubricating oil supplied is appropriate according to the engine operating conditions. Controlled.

Further, the lubrication device includes an air vent that allows the oil chamber to communicate with the external space. That is, in this lubricating device, when the engine is stopped, with the air bleed screw that is screwed in the air bleed port removed, the lubricating oil is fed from the oil tank to the suction pipe, the suction port, and the oil chamber connected to the suction port. When the lubricating oil starts to leak from the air vent port, the air vent screw on the suction pipe side can be vented by screwing the air vent screw back into the air vent port.

However, in the above lubrication device, even if air is bleeding by using the air bleeding port, there is a check valve that does not open the non-intake line side of the discharge pipe due to the negative pressure of the intake line. Since it is blocked by, it is not possible to bleed the discharge port and discharge pipe.

Therefore, in this lubricating device, due to the remaining air on the discharge side of the oil pump, it takes a long time, for example, 30 minutes to 1 in an idle operation state from the engine start to the supply of lubricating oil to the intake pipe line. It takes about 50 seconds to 60 seconds even when the throttle valve is fully opened, and during this time, engine trouble may occur due to poor lubrication of various parts of the engine.

An object of the present invention is to quickly and surely perform air bleeding for the suction pipe and the discharge pipe of an oil pump and each oil chamber with a simple structure.

In order to achieve the above object, in the present invention, between the oil chamber of the oil pump and the discharge port, it is opened only by the discharge pressure in the oil chamber without being opened by the negative pressure in the intake pipe line, and the discharge is performed. In a lubricating device for an internal combustion engine, which includes a check valve for preventing the backflow of lubricating oil from the outlet side to the oil chamber side, "a discharge pipe integrated with a discharge port of an oil pump is provided with a discharge pipe. Connecting the intake pipe line of the engine ", and" connecting one end of the communication pipe having an opening / closing valve in the middle part to the suction port or the suction pipe, and the other end to the discharge port or the discharge pipe " By combining the two configurations of "integrally connecting to the pump,""the intake suction and discharge piping of the pump and the air in each oil chamber are bleeded by using the intake negative pressure of the engine". .

That is, according to the present invention, there are the following effects.

When the on-off valve of the communication pipe is opened during engine operation, for example, during idle operation, the suction port side and the discharge port side communicate by bypassing the check valve, and as a result, negative pressure in the intake pipe line from the discharge port. Bypasses the check valve and acts on the suction port and each oil chamber that is intermittently connected to the suction port, and quickly bleeds air from the suction pipe that connects to the suction port, the discharge pipe that connects to the discharge port, and the pump chamber oil chamber. be able to.

At this time, one end of the communication pipe that communicates the discharge port side where the intake negative pressure acts with the suction port side is integrally connected to the suction port or the suction pipe, and the other end is connected to the discharge port or the discharge pipe. Connected integrally. Therefore, the pipe length of the communication pipe becomes extremely short, reducing the pressure loss of the pipe, the chance of air retention in the middle of the pipe, and the quick air bleeding.
You can be absolutely certain.

Further, since the communication pipe is integrally provided as a part of the structure of the oil pump, the structure is compact and simple, and the assemblability into the engine is improved.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an outboard motor 2 to which an embodiment of the present invention is applied.
FIG. 2 is a front view showing a cycle 3-cylinder engine, and FIG. 2 is a sectional view showing an oil pump used in the same embodiment.

Three cylinders are vertically formed in the cylinder block 11, a vertical crankshaft 13 is supported between the cylinder block 11 and the crankcase 12, and a lower end portion of the crankshaft 13 propels the outboard motor. A drive shaft 13A arranged in the unit is connected. Piston 1 for each cylinder
4 are accommodated, and each piston 14 is connected to the crankshaft 13 via a connecting rod 15. Crank chamber 1 for each cylinder
A vaporizer 18 is connected to 6 via an intake pipe line 17. In the figure, 19 is an oil tank for storing lubricating oil.

An oil pump 20 is installed at the lower front of the cylinder block 11.
Is fixed. As shown in FIG. 2, the oil pump 20 has suction ports 21 communicating with the oil tank 19 and discharge ports 22A to 22 communicating with the intake conduit 17 of each cylinder.
Housing 23 including C (22B and 22C are not shown)
The driven gear 25 that meshes with the drive gear 24 fixed to the crankshaft 13, the ring gear 26 that meshes with the driven gear 25, the suction port 21, and the discharge ports 22A to 22C can be intermittently communicated. A revolving structure 28 that forms the oil chamber 27 and is rotatably supported by the housing 23 integrally with the ring gear 26, and reciprocates up and down inside the oil chamber 27 by being housed in the oil chamber 27 of the revolving structure 28. Plunger 29 and a spring 30 for urging the plunger 29 downward
And a cam 32 fixed to the housing 23 and capable of pushing up the tip of the pin 31 of the plunger 29 upward.
That is, as the crankshaft 13 rotates, the drive gear 24
When the revolving unit 28 rotates inside the housing 23 through the meshing of the driven gear 25 and the driven gear 25 and the ring gear 26, the plunger 29 that rotates together with the rotation of the revolving unit 28 contacts the pin 31 and the cam 32. Oil chamber 2 through contact
By moving the inside of 7 up and down, a pumping action is generated inside the oil chamber 27, and the lubricating oil sucked from the suction pipe 34 connected to the suction pipe 33 arranged in the suction port 21 is Discharge pipes 36A to 3C connected to discharge pipes 35A to 35C arranged at the discharge ports 22A to 22C.
Via 6C, it is pressure-fed to the intake pipe line 17 of each cylinder so that it can be discharged into the air-fuel mixture.

Further, in the oil pump 20, an adjusting plate 37 inserted in the inner peripheral portion of the ring gear 26 in a vertically movable state, a spring 38 for urging the adjusting plate 37 downward, and an adjusting plate 37 integrated with the adjusting plate 37. It has an adjusting cam 40 for pushing the tip of the pin 39 that is pushed upward. The lower surface of the plunger 29 is brought into contact with the upper surface of the adjusting plate 37 so that the plunger 2
The maximum discharge amount of the oil pump 20 can be regulated by regulating the lower end position of 9 and thus the reciprocating stroke of the plunger 29. Here, a pump lever 42 is fixed to a cam shaft 41 of an adjusting cam 40 protruding from the housing 23, and a throttle lever 45 connected to a throttle valve shaft 44 is coupled to the pump lever 42 via a link 43. Has been done. That is,
When the operating angle of the pump lever 42 and the adjustment cam 40 increases via the throttle lever 45 and the link 43 as the opening degree of the throttle valve increases, the adjustment plate 37 moves further downward, and the reciprocating stroke of the plunger 29 increases. As a result, the discharge amount of the oil pump 20 can be increased.

In addition, the respective discharge ports 22A to 22C of the oil pump 20,
Between the discharge ports 22A to 22C and the oil chamber 27 which is in a state of being communicable with each other, the negative pressure generated inside the intake pipe line 17 does not open, but only the discharge pressure generated in the oil chamber 27 causes the discharge. A check valve 46 for preventing the backflow of the lubricating oil from the outlets 22A to 22C side to the oil chamber 27 side is interposed.
The check valve 46 stabilizes the discharge pressure and the discharge flow rate of the lubricating oil discharged from the oil chamber 27, and ensures proper control of the lubricating oil supply amount according to the operating state of the engine.

Further, a communication pipe 47 is attached to the suction port 21 of the oil pump 20.
Is integrally connected to the other end of the communication pipe 47, and one end of a communication pipe 49 is integrally connected to the other end of the communication pipe 47 via an opening / closing valve 48. The other end of the communication pipe 49 is branched in three directions, and the branch portions 49A to 49C are respectively connected to the discharge ports 22A to 22C.
Are integrally connected to. That is, in this oil pump 20, the suction port 21 side and the discharge ports 22A to 22A are provided.
The C side can communicate with each other by communication pipes 47 and 49 that bypass the oil chamber 27.

The housing 23 of the oil pump 20 has a suction port 2
1 is provided with an air vent port 50, and an air vent screw 51 can be attached to and detached from the air vent port 50. However, the oil pump 20 does not necessarily need to include the air vent port 50 and the air vent screw 51.

Next, the operation of the above embodiment will be described.

On-off valve 4 during engine operation, for example during idle operation
By opening 8 and connecting the suction port 21 and each of the discharge ports 22A to 22C by bypassing the check valve 46, the intake pipe line 17 and the oil tank 19 are connected. As a result, due to the action of the negative pressure generated inside the intake pipe line 17, the smooth flow of the fluid from the oil tank 19 to the intake pipe line 17 is generated by the suction pipe 34 and the discharge pipes 36A to 36C.
In the suction pipe 34, the suction port 21,
Oil chambers 27 intermittently connected to the suction port 21, discharge ports 22
The air in the A to 22C and the discharge pipes 36A to 36C can be quickly exhausted to the intake pipe line 17 side.

At this time, one end of each of the communication pipes 47 and 49 that communicate the discharge ports 22A to 22C on which the intake negative pressure acts with the suction port 21 is integrally connected to the suction port 21, and the other ends thereof are the discharge ports. 22A to 22C are integrally connected. Therefore, the pipe length of the communication pipes 47 and 49 becomes extremely short, the pressure loss of the pipes and the chance of air retention in the middle portion of the pipes are reduced, and quick and reliable air bleeding can be thoroughly achieved.

Further, since the communication pipes 47 and 49 are integrally provided as a part of the configuration of the oil pump 20, the structure is compact and simple, and the assembling into the engine is also good.

Therefore, according to the above embodiment, the suction pipe 3
4. It becomes possible to bleed air from each of the discharge pipes 36A to 36C and each of the oil chambers 27, and the time from starting the engine to supplying the lubricating oil to the intake pipe line 17 is short, for example, 5 minutes in the idle operation state. By setting the time to about 6 minutes, it is possible to surely avoid the occurrence of engine trouble due to poor lubrication.

Since the oil pump 20 is provided with the air vent port 50 and the air vent screw 51 as described above, when the engine is stopped, the air vent port 50 from which the air vent screw 51 is removed is the same as the conventional one. You may make it air-bleed. According to this, the communication pipe 47 following this,
It is possible to further shorten the above-mentioned air bleeding work time using 49. However, if the air bleeding is performed only by using the communication pipes 47 and 49 without using the air bleeding port 50, contamination due to leakage of lubricating oil from the air bleeding port 50 may occur around the oil pump 20. There is no.

Further, in the present invention, as shown by the chain double-dashed line in FIG. 2, a communication pipe 53 having an opening / closing valve 52 in an intermediate portion is interposed between the suction pipe 33 and each of the discharge pipes 35A to 35C. You may wear it. In this case, the suction pipe 33, the discharge pipes 35A to 35C, the communication pipe 53, and the opening / closing valve 52 are integrally formed, so that the structure can be simplified more safely.

Further, in the above embodiment, the single open / close valve 48 is used by branching the other end of the communication pipe 49 into three directions connected to the respective discharge ports 22A to 22C. However, between the suction port 21 and each of the discharge ports 22A to 22C,
On-off valves and communication pipes corresponding to the number of cylinders may be provided.

As described above, according to the present invention, the suction pipe and the discharge pipe of the oil pump and the air in each oil chamber can be quickly and reliably deflated with a simple structure.

[Brief description of drawings]

FIG. 1 is a front view showing an internal combustion engine for an outboard motor to which an embodiment of the present invention is applied, and FIG. 2 is a sectional view showing an oil pump used in the same embodiment. 17 ... Intake line, 19 ... Oil tank, 20 ... Oil pump, 21 ... Suction port, 22A-22C ... Discharge port, 27 ... Oil chamber, 34 ... Suction pipe, 36A-36C
...... Discharge pipe, 46 ...... Check valve, 47, 49, 53 ......
Communication pipe, 48, 52 ... Open / close valve.

Claims (1)

[Claims] Claim: What is claimed is: 1. An oil tank is connected via a suction pipe to a suction pipe that is integrated with a suction port that communicates with an oil chamber that performs the pumping action of an oil pump, and that is integrated with a discharge port that communicates with the oil chamber of the oil pump. The intake pipe of the engine is connected to the converted discharge pipe through the discharge pipe, and the inside of the oil chamber is not opened between the oil chamber of the oil pump and the discharge port due to the negative pressure in the intake pipe. In a lubricating device of an internal combustion engine, which is opened only by discharge pressure and has a check valve for preventing backflow of lubricating oil from the discharge port side to the oil chamber side, a communication pipe having an opening / closing valve in the middle part A lubricating device for an internal combustion engine, characterized in that one end thereof is integrally connected to the suction port or the suction pipe, and the other end is integrally connected to the discharge port or the discharge pipe.