JPS608103Y2 - Lubricating oil priming piston pump for air start engines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a lubricating oil priming piston pump that supplies an appropriate amount of lubricating oil to the lubricating parts of an air-start internal combustion engine prior to starting the engine.

Among internal combustion engines such as diesel engines, especially air-start internal combustion engines that start automatically or remotely using compressed air, the main bearings, etc. are lubricated before starting the engine, and the bearings immediately after starting. For the purpose of preventing parts from seizing and reducing friction between various parts of the engine, making it easier to start the engine.
It is equipped with a lubricating cylinder that uses compressed air, a so-called lubricating oil priming piston pump.

By the way, a conventional lubricating oil priming piston pump used in this type of air-start engine has an oil cylinder 1 containing lubricating oil and an air cylinder 2, as shown in FIG.
Generally, an oil piston 3 inserted into the oil cylinder 1 and an air piston 4 inserted into the air cylinder 2 are connected in series with each other by a rod 5. Control air (9/c7I for 7 to 10) supplied via a starter valve or solenoid valve, etc. is supplied to the air cylinder 2 from an air intake lower provided on the air cylinder lid 6.
The oil piston 3 moves the air piston 4 in the direction of the arrow X, and the oil piston 3 moves the lubricating oil filling the oil cylinder 1 through a lubricating oil outlet provided at the top of the oil cylinder lid 8. 9 to the engine side, and when the air piston 4 slides a certain stroke S and completes priming, the control air that entered from the air cylinder lid 6 flows into the air outlet section 10 at the top of the air cylinder 2. The air flows out from the air, is sent to a blocking valve (not shown), opens the main valve, and presses high-pressure air into a cylinder on the engine side, thereby starting the engine with air.

However, as mentioned above, such a lubricating oil priming pump with a conventional structure requires two cylinders and two pistons, and since both pistons are connected by a rod at a distance, the pump as a whole becomes large and requires a large installation. This not only requires space, but also increases the number of parts, raising manufacturing costs.

In order to reduce the number of parts in such a piston pump, a piston pump that integrates the oil cylinder and air cylinder has been proposed (see Japanese Utility Model Publication No. 1202-1972), but this also requires two pistons. There is no change in the structure in which the two are connected by rods at predetermined intervals (
, so the length of the cylinder becomes longer by that much, and in the end,
It was inevitable that the overall size would increase.

The present invention focused on the problems that the conventional lubricating oil priming piston pump had, and was made with the intention of rectifying and improving the problems. The main body is divided into a lubricating oil chamber and an air chamber, and a compressed air flow passage is provided in the air chamber, and a lubricating oil outlet passage and an air flow passage on the air chamber side are provided in the lid on the lubricating oil chamber side of the cylinder body. The object of the present invention is to provide a lubricating oil priming piston pump for an air-start engine, characterized in that it is equipped with a valve that opens and closes according to the sliding of the piston.

Hereinafter, the specific contents of the present invention will be explained in detail with reference to the embodiments shown in the accompanying drawings. Figure 2 shows the front of the piston pump of the present invention, and Figure 3 shows the arrow indicated by the line A--A in Figure 2. The cross-sections are shown respectively, and in these figures, 11 is
It is a cylinder body in which one piston 12 is slidably inserted, and the cylinder body 11 has an opening at one end that is connected to a lid member 1 having an air hole 13 in the center.
4 through a gasket 15, and the opening on the other end side is sealed with a lid member 17 with a gasket 16 interposed therebetween, and the inside thereof is partitioned by the piston 12. It has an air chamber 18 into which compressed air is introduced, and a lubricating oil chamber 19 filled with lubricating oil.

Further, the cylinder body 11 has a rib 20 formed in the longitudinal direction on its outer peripheral surface, and a first air flow passage 2 that communicates with the air chamber 18 through a through hole 21 within the rib 20.
2 is provided, and a through hole 24 communicating with the air chamber 18 and having a perforated plug 23 fitted outwardly is bored in the lower surface.

On the other hand, reference numeral 25 in the figure is a valve device mounting hole bored in the center of the lid member 17 that seals the lubricating oil chamber 19 side, and the mounting hole 25 has the first air flow through the cylinder body 11. Road 2
A second air passage 26 communicating with the lubricating oil chamber 19 side is opened, and a valve guide member 27 screwed into the opening of the mounting hole 25 on the lubricating oil chamber 19 side is disposed inside the second air passage 26, as shown in an enlarged view in FIG. , a valve body 29 inserted into a sliding hole 28 provided in the valve guide member 27 and a spring receiver attached to one end of the valve body 29 are screwed into a member 30 and an outer opening of the mounting hole 25. A valve device 33 consisting of a compression spring 32 interposed between the spring pressing members 31 is housed.

The head of the valve body 29 is formed as a dish-shaped valve part 34, the middle part is a connecting rod part 35 with a slightly narrow diameter, and the lower end part 36 is formed in the sliding hole 28. ,
It is configured to be able to slide in a fluid-tight manner via an O-ring 37, and the valve seat portion 38 on the guide member 27 side is always closed by the action of the compression spring 32, and the lower end portion 36 is attached to the valve guide member. The lower end 36 of the valve body 29 is pressed by the abutting portion 40 of the piston 12 sliding in the cylinder body 11, and the valve When the entire body 29 moves to the left in the figure as shown in FIG. A series of air passages are opened leading to an air outlet 44 which is open to the outer surface of the air passage 17 and communicates with the first and second air flow passages 22, 26.

Further, the lid member 17 has a lubricating oil outlet passage 46 at its upper position, through which the lubricating oil filled in the lubricating oil chamber 19 is delivered to the lubricated parts of the engine through a pipe 45.
The passage 46 is provided with a check valve 48 having an oil return hole 47 in the center.

In the figure, 49 is a turbocharger piston pump that supplies lubricating oil to the turbocharger together with the priming piston pump configured as described above, 50 is a quick exhaust valve, 51 is an air bleed plug, and 52 and 53 are the respective parts. Packaging that maintains airtightness, 5
4 is an O-ring fitted around the outer periphery of the piston 12.

The piston pump of the present invention has the above-mentioned construction, and its operation will now be described when applied to an air starting circuit as shown in FIG.

First, high-pressure air (30 kg/crft) introduced into the blocking valve 55 from an air tank (not shown) is sent to the pressure reducing valve 57 through the pipe 56, and its pressure is reduced to 10 to 91 crft.
It is introduced into the solenoid valve 58 after the pressure is reduced to a certain degree.

The solenoid valve 58 is remotely operated when the engine is started, and when the solenoid valve 58 is opened, the depressurized air passes through the quick exhaust valve 50 and is discharged from the air port 13 of the piston pump to the cylinder body 11. sent inside.

At this time, since the piston 12 is located in the piston pump on the side shown in FIG. 3, the air introduced into the cylinder body 1 presses and moves the piston 12 to the left due to its pressure. The lubricating oil filling the lubricating oil chamber 19 side is supplied from the lubricating oil outlet passage 46 to the lubricating parts of the engine through the check valve 48 and the lubricating pipe 45.

Thereafter, the piston 12 moves a predetermined stroke, and its contact portion 40 contacts the valve body 29 of the valve device 33, opening the valve and discharging the air pressurized into the air chamber 18 side of the cylinder body 11. Air outlet 44 through flow passage 22.26
When the air is discharged from the air tank, the discharged air returns to the blocking valve 55 through the piping 59, and the main valve is opened to allow the high-pressure starting air, which is pumped from the air tank, from the main air pipe 60 to the engine through the distribution valve. The engine is started by distributing it to the cylinders at the beginning of the explosion stroke.

Next, lubricating oil is supplied to the lubricating parts of the engine by the action of the piston pump, and when the oil pump is activated with the start of the engine, the pressure of the lubricating oil causes the check valve 4 to
The lubricating oil flows back into the cylinder body 11 through the oil return hole 47 of 8. The waist piston 12 is pushed back and returns to the state shown in FIG.
In order to close the air passages 22, 26, the air supply to the blocking valve 55 is stopped, the main valve of the blocking valve 55 is closed, and the starting air to the cylinders of the engine is cut off.

In addition, as shown in FIG. 6, the blocking valves applied to the air starting circuit having the above configuration include a pipe 61 that introduces high pressure air from the air tank, and a pipe 62 that supplies high pressure air to the pressure reducing valve 57. A main valve 64 is vertically slidably inserted into a valve body 63 formed by connecting the main valve 64 to a spring retainer 65, and the valve seat portion 67 to close the starting air passage 68 leading from the valve body 63 to the cylinder of the engine, and at the same time, inside the guide 69 attached to the lower part of the valve body 63, the pressure of the air flowing back from the piston pump through the piping 59 causes the air to flow upward. A valve 71 that slides and pushes up the lower end 70 of the main valve 64 is housed therein.

As described above, the lubricating oil priming piston pump of the present invention has one piston housed within the cylinder body,
As the piston vibrates, the opening/closing valve of the air flow passage communicating with the air chamber of the cylinder body is operated, so the connecting rod and two parts, which are essential components in conventional piston pumps, are operated. This eliminates the need for multiple pistons, shortens the length of the cylinder body, promotes compactness of the device, facilitates installation in internal combustion engines, and reduces device costs. It is something to do.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing an example of a conventional piston pump, Figs. 2 to 4 show an embodiment of the piston pump of the present invention, Fig. 2 is a front view of the same pump, and Fig. 3 is a schematic diagram showing an example of a conventional piston pump. FIG. 2 is a sectional view taken along the line A-A in FIG. 2, and FIG. 4 is an enlarged sectional view of the valve device portion of the same pump. Further, FIG. 5 shows an example of an air starting circuit to which the piston pump of the present invention is applied, and FIG. 6 is a sectional view showing an example of the configuration of a blocking valve provided in the air starting circuit. 11... Cylinder body, 12... Piston, 17... Lubricating oil chamber side cover, 18...
・Air chamber, 19... Lubricating oil chamber, 22, 26...
... Air flow passage 33 ... Valve device, 46.
...Lubricating oil outlet passage.

Claims (1)

[Scope of utility model registration request] One piston is housed in the cylinder body, the cylinder body is divided into a lubricating oil chamber and an air chamber, a flow path for compressed air is provided in the air chamber, and a piston is provided on the lubricating oil chamber side of the cylinder body. A priming piston pump for an air-start engine, characterized in that the lid is provided with a valve that opens and closes a lubricating oil outlet passage and an air flow passage provided on the air chamber side in accordance with the sliding movement of the piston.