JP3222322B2 - Engine lubrication device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine lubrication apparatus, and more particularly to an engine lubrication apparatus provided with a pneumatically driven high-pressure booster pump.

[0002]

2. Description of the Related Art In general, lubrication of a sliding portion and a bearing portion of a reciprocating engine is performed by taking power from an output shaft of the engine, driving an oil pump, and lubricating the oil to a predetermined pressure. Have been. Diesel engine fuel injection pumps are also driven by power taken from the output shaft of the engine.

[0003]

When the engine is stopped and the oil pump is stopped, the pressure of the lubricating oil supplied to each lubricating unit drops, and therefore, when the engine is restarted, the supply of the lubricating oil by the oil pump is performed. However, it takes a long time to supply lubricating oil to the lubricating parts, and there is a problem that these parts may be damaged.

In the case of an oil supply circuit, if an excessive pressure is generated for some reason such as damage to lubrication parts,
It is preferable that the pressure in the oil supply circuit can be restored to an appropriate value. Further, in the sliding portion of the plunger of the fuel injection pump of the engine, the fuel is carbonized by the lubrication heating and the sliding is hindered. Therefore, it is necessary to add high-pressure oil to the sliding portion to remove and clean the carbide.

[0005]

SUMMARY OF THE INVENTION Accordingly, in view of the above circumstances, the present invention provides a method of adding pneumatic pressure to a sliding portion of a plunger of an engine fuel injection pump in order to add high-pressure oil and remove and clean carbides. The hydraulic discharge port of the driving high-pressure booster pump is connected to the hydraulic suction port of the pneumatic driving high-pressure boosting pump separately to an oil tank separately.The pneumatic driving high-pressure boosting pump has a piston that moves forward and backward in the cylinder chamber and the plunger chamber, respectively. Equipped with a plunger, a piston is urged by a spring, a main valve that controls the inflow and cutoff of compressed air flowing into the cylinder chamber is controlled by a limit valve, and oil is supplied to the plunger chamber by moving the plunger into and out of the plunger chamber. More inflow,
The engine lubrication device was designed to discharge from the hydraulic discharge port.

According to the present invention, the discharge port of the pneumatically driven high pressure booster pump is provided in the lubricating oil passage of the engine so that the lubricating oil contained in the oil pan of the engine and the pneumatically driven high pressure booster pump can be lubricated. Are connected to the oil pan of the engine and the hydraulic suction port of the pneumatic drive high pressure booster pump, respectively.
The pneumatic drive high-pressure booster pump has a piston and a plunger that advance and retreat in the cylinder chamber and the plunger chamber, respectively.The main valve that urges the piston with a spring and injects / blocks the compressed air that flows into the cylinder chamber is a limit valve. The lubricating device of the engine is controlled so that the oil is caused to flow into the plunger chamber from the hydraulic suction port and discharged from the hydraulic discharge port when the plunger moves into and out of the plunger chamber.

[0007]

[Function] Since the hydraulic discharge port of the pneumatically driven high-pressure booster pump is connected to the sliding part of the plunger of the fuel injection pump that requires a high pressure, the carbonized part of the fuel is removed with high-pressure oil, washed, and the sliding part of the sliding part is removed. Sliding becomes possible. Further, in the present invention, the hydraulic discharge port of the pneumatically driven high-pressure booster pump is connected to the engine oil pan, and the hydraulic suction port of the pneumatically driven high-pressure booster pump is connected to the engine oil pan. Can be supplied with high-pressure hydraulic pressure.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on specific embodiments shown in the accompanying drawings. In FIG. 1, an engine 1 has a cylinder head 3 and a head cover 4 arranged on a cylinder block 2, and an oil pan 5 arranged below the cylinder block 2.

The engine 1 has a crankshaft 6 driven by a reciprocating motion of a piston, a rocker arm 7 for driving an intake / exhaust valve to a combustion chamber of the engine 1, and a valve cam for driving the rocker arm 7. A shaft 8 is provided. Further, there is a fuel injection pump 9 for injecting fuel into the combustion chamber, and the fuel injection pump 9 is driven by a fuel injection camshaft 10.

In order to lubricate the crankshaft 6, the valve operating camshaft 8, the rocker arm 7, the fuel injection camshaft 10, and the like, the oil pump 11 supplies the lubricating oil 12 in the oil pan 5 via the lubricating oil passage L. The oil is supplied to each part via an oil filter 13. In the present invention, a pneumatically driven high-pressure intensifying pump 16 for supplying high-pressure oil to the fuel injection pump 9 is provided separately from the lubrication mechanism by the oil pump 11, and a hydraulic discharge port 17 of the pneumatically driven high-pressure intensifying pump 16, Connect the sliding part of the injection pump 9 to the plunger, and install the hydraulic suction port 18 and a separate oil tank.
And 19 respectively.

In the fuel injection pump 9, fuel flows from the suction hole 21 through the suction valve 22 to the fuel chamber 23, and is compressed by the up and down movement of the plunger 25 driven by the cam 24, opens the discharge valve 26, and opens the discharge valve 27. Spout the fuel. Reference numeral 57 denotes a needle. The pneumatically driven high pressure intensifier pump 16
Is increased until the pressure increase balances with the receiving pressure of the piston 31. On the other hand, when the hydraulic pressure drops and the balance is broken, the piston 31 operates again due to the received pressure of the piston 31.

The operation of the pneumatically driven high pressure intensifier pump 16 will be described with reference to FIGS. In the first state, as shown in FIG. 2, the limit valve 33 is pushed open by the spring force of the spring 32 for urging the piston 31. The compressed air A from the main valve 34 passes through the limit valve 33 and flows into the upper part of the main valve 34, that is, into the pilot chamber 35.

Next, as shown in FIG.
The main valve 34 presses the spring 36 by the received pressure, and the main valve 34 is switched. Then, the compressed air A enters the cylinder chamber 37, and moves the piston 31 rightward by the pressure received by the piston 31. The oil O opens the discharge valve 44 and moves the plunger chamber 43 of the plunger 42 to the hydraulic discharge port by the volume that has been moved.
Discharge from 17

As shown in FIG. 4, when the piston 31 moves to the final end, the left end of the plunger 42 opens, and the compressed air A in the pilot chamber 35 is discharged from the filter 45 to the atmosphere. The main valve 34 returns by the spring force of the spring 36,
The compressed air A in the cylinder chamber 37 is silenced by the silencer 46 and released to the atmosphere.

As shown in FIG. 5, the piston 31 moves to the left by the spring force of the spring 32, and at this time, the suction valve 47 opens to suck the oil O. When the piston 31 moves to the final end, the state returns to the state where the limit valve 33 is pushed. The operation is repeated as described above to discharge the hydraulic oil. That is, the automatic operation is performed by the supply of the compressed air, and is automatically stopped when the specified pressure is generated, so that the required oil amount can be automatically secured.

The pneumatically driven high pressure intensifier pump 16 is shown in FIG.
The air supply port 51 is connected to a compressed air valve 53 via a switching valve 52 as shown in FIG. On the other hand, the hydraulic discharge port 17 is a cylinder 54 on which the plunger 25 of the fuel injection pump 9 slides.
Via an oil feed pipe 55. The hydraulic suction port 18 of the pneumatically driven high pressure booster pump 16 is connected to the separate oil tank 1.
9 is connected via a suction pipe 56.

While the engine 1 is operating, high-pressure oil O is supplied from a hydraulic discharge port 17 to a sliding portion between the plunger 25 and the cylinder 54 of the fuel injection pump 9 from a pneumatically driven high-pressure booster pump 16. Therefore, the lubricated and heated carbide can be removed and cleaned, and the plunger 25 of the fuel pump 9 can be removed.
The sliding portion is not hindered from sliding. Also,
When the specified oil is generated, it stops automatically, and the required oil amount can be automatically secured. This is because in the pneumatically driven high-pressure intensifying pump 16, the increased pressure of the oil O increases until it balances with the receiving pressure of the piston 31. On the other hand, if the oil pressure drops and the ballast collapses,
This is because the operation is performed again by the receiving pressure of the piston 31.

In the present invention, as shown in FIG. 6, the hydraulic discharge port 17 of the pneumatically driven high pressure intensifying pump 16 is connected to the lubricating oil passage L via the oil supply pipe 61, and the hydraulic suction port 18 is connected to the suction pipe. It is connected to the oil pan 5 via 62. The pneumatically driven high-pressure booster pump 16 can be supplied to another lubricating oil passage L instead of the fuel injection pump 9, and in this case, the lubricating oil 12 stored in the oil pan 5 of the engine 1 is used.

Also in this case, similarly to the above, the pneumatic drive high pressure intensifier pump 16 can supply high pressure oil O to the lubricating oil passage L, automatically operates by supplying compressed air, and automatically stops when a specified pressure is generated. Then, the required oil amount can be automatically secured.

[0020]

As described above, according to the present invention, the hydraulic discharge port of the pneumatically driven high pressure booster pump and the hydraulic suction port of the pneumatically driven high pressure booster pump are provided at the sliding portion of the plunger of the fuel injection pump of the engine. The pneumatically driven high-pressure booster pump is connected to a separately installed oil tank, and has a piston and a plunger that advance and retreat in the cylinder chamber and the plunger chamber, respectively. The engine lubrication system controls the main valve that shuts off with a limit valve, and allows the oil to flow into the plunger chamber from the hydraulic suction port and discharge from the hydraulic discharge port by moving the plunger into and out of the plunger chamber. It does not require a complicated control circuit like a pump, operates automatically by supplying air pressure, automatically stops when a specified pressure is generated, and automatically supplies the necessary oil. There can be secured.

When the engine is stopped and the oil pump is stopped, the pressure of the lubricating oil supplied to each lubricating portion drops, and therefore, it takes time to supply the lubricating oil by the oil pump when the engine is restarted. Although lubricating oil cannot be supplied to each lubricating part and there is a risk of damaging these parts, the supply of compressed air in the present invention makes it possible to always supply high-pressure oil.

The discharge port of the pneumatically driven high pressure intensifier pump is connected to the lubricating oil passage of the engine, and the hydraulic suction port of the pneumatically driven high pressure intensifier pump is connected to the oil pan of the engine, respectively.
The pneumatic drive high-pressure booster pump has a piston and a plunger that advance and retreat in the cylinder chamber and the plunger chamber, respectively.The main valve that urges the piston with a spring and injects / blocks the compressed air that flows into the cylinder chamber is a limit valve. It is an engine lubrication device that controls the plunger to move into and out of the plunger chamber to allow oil to flow into the plunger chamber from the hydraulic suction port and discharge from the hydraulic discharge port.
High-pressure oil is automatically operated in the engine's lubricating oil passage, and automatically stops when a specified pressure is generated.The required amount of oil can be secured automatically.In the lubrication circuit, excessive pressure due to any cause such as damage to lubrication parts. Is generated, the pressure in the oil supply circuit can be restored to an appropriate value.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating a lubricating device for an engine according to a specific embodiment for supplying high-pressure oil to a fuel injection pump according to the present invention.

FIG. 2 is a diagram illustrating the operation of a pneumatically driven high pressure booster pump used in the present invention.

FIG. 3 is an operation explanatory view of a pneumatically driven high-pressure booster pump used in the present invention.

FIG. 4 is an operation explanatory view of a pneumatically driven high-pressure booster pump used in the present invention.

FIG. 5 is an operation explanatory view of a pneumatically driven high-pressure intensifying pump used in the present invention.

FIG. 6 is an explanatory diagram of a lubricating device for an engine that supplies high-pressure oil to a lubricating oil passage using a pneumatically driven high-pressure booster pump according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Engine 9 ... Fuel injection pump 16 ... Pneumatic drive high pressure booster pump 25 ... Plunger 17 ... Hydraulic discharge port 18 ... Hydraulic suction port 19 ... Separate oil tank L ... Lubricating oil path A ... Compressed air O ... Oil

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F01M 9/10 F01M 1/02 F02M 59/44 F04B 9/123

Claims (2)

(57) [Claims] 1. A hydraulic discharge port of a pneumatically driven high pressure booster pump is connected to a sliding portion of a plunger of a fuel injection pump of an engine, and a hydraulic suction port of a pneumatically driven high pressure booster pump is connected to a separately installed oil tank. The pneumatic drive high-pressure booster pump has a piston and a plunger that advance and retreat in the cylinder chamber and the plunger chamber, respectively.The main valve that urges the piston with a spring and injects / blocks the compressed air that flows into the cylinder chamber is a limit valve. An engine lubricating device, wherein oil is flowed into a plunger chamber from a hydraulic suction port and discharged from a hydraulic discharge port by controlling the plunger into and out of the plunger chamber. 2. The pneumatically driven high-pressure intensifier pump has a discharge port connected to an engine lubricating oil passage and a hydraulically-inlet port of the pneumatically driven high-pressure intensifier pump connected to an engine oil pan. Equipped with a piston and plunger to advance and retreat the cylinder chamber and plunger chamber, respectively. A main valve that urges the piston with a spring and controls the inflow and cutoff of compressed air flowing into the cylinder chamber is controlled by a limit valve. An oil lubricating device for an engine, characterized in that oil is caused to flow into a plunger chamber through a hydraulic suction port and to be discharged from a hydraulic discharge port as the water advances and retreats.