JPS6210421Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a blazer device for the crank chamber of a vertical overhead valve engine.It has a simple structure but improves oil separation performance, and uses the separated oil to lubricate the intake and exhaust valve shafts. The purpose is to improve performance.

In a crank chamber blazer device, which is generally attached to a vertical overhead valve engine, the blazer gas that flows from the crank chamber into the valve arm chamber is drained by an oil separator installed on the top surface of the head cover, and then sucked into the intake system passage. It's becoming like that.

However, with these systems, the blow-by gas sucked into the oil cutting chamber contains a large amount of lubricating oil when it passes through the blow-by gas blow-up hole and the valve arm chamber, and the oil is not sufficiently separated by the blazer device and enters the intake system path. Inhaled.

Therefore, in order to improve the oil separation performance of the blazer device, it is conceivable to make the oil separation device larger, but this is not only expensive but also increases the external size of the engine.

This invention was proposed in order to eliminate the upper air defect, and uses a partition plate to prevent a large amount of lubricant mist that scatters into the valve arm chamber from directly flowing into the oil cutout chamber of the blazer device. The lubricating oil separated by the blazer device is supplied to the ends of the valve shafts of the intake and exhaust valves to improve the lubrication performance of the intake and exhaust valve shafts.

As a structure for this purpose, a hole for blowing up the blazer gas from the crank chamber is made on the lower surface of one side of the valve arm chamber in the head cover of the vertical overhead valve engine, and the end of the valve shaft is inserted upward into the other side. A partition plate is arranged at least near the other side of the upper space in the valve arm chamber so that the other side slopes downward, a buffer space is formed on the partition plate, and a communication path between the buffer space and the valve arm chamber is formed by the partition plate. An oil cut chamber for the blazer device is provided near the other side edge of the head cover, and the entrance of this oil cut chamber is opened on one side of the buffer space. The oil return hole is located above the valve shaft end, and an oil return hole is formed in the inclined downward end of the partition plate above the valve shaft end.

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

FIG. 1 shows a longitudinal sectional front view of a vertical water-cooled overhead valve diesel engine. This engine 1 has a cylinder block 4 integrally formed above a crankcase 2, in which a piston 3 is vertically slidable. A cylinder head 5 and a head cover 6 are placed and fixed in this order above the cylinder head.

The piston 3 of the cylinder block 5 is connected by a connecting rod 8 to a crankshaft 7 which is rotatably supported on the crankcase 2.
A main twisting chamber 9 is formed above.

This main combustion chamber 9 directly communicates with an auxiliary combustion chamber 10 formed in the cylinder head 5, and has an intake/exhaust port 11.
It communicates with the air intake and exhaust valves 12 through the intake and exhaust valves 12.

The intake/exhaust valve 12 pushes up a tappet 15 with a valve drive cam shaft 14 pivotally supported in a valve drive cam chamber 13 formed on the side of the cylinder block 5, and pushes up a tappet 15 through a push rod 16 to a locker arm 18 in a valve arm chamber 17.
By swinging and pushing the shaft end 20a of the valve shaft 20 against the valve spring 19, the suction/exhaust port 11 and the main twisting chamber 9 are brought into communication.

A communication hole 2 that communicates with the crank chamber 21 in the crankcase 2 is provided at the bottom of the valve cam chamber 14.
2 is open, and this communication hole 22 is connected to the main twisting chamber 9.
The blow-by gas leaking into the crank chamber 21 is guided to the valve train cam chamber 13.

The blow-by gas that has flowed into the valve train cam chamber 13 flows into the valve arm chamber 17 in the head cover 6 through the tappet hole 23 and the push rod insertion hole (breather gas blow-up hole) 24, and from there flows into the valve arm chamber 17, which will be described later.
After oil separation, air cleaner 25 and intake port 1
1 and is returned to the intake cylinder 26 between the two.

As shown in FIG. 2, in the breather device B, a breather casing 29 having a gas-liquid separation material 28 made of steel wool or the like inside is attached above the blow-by gas outlet hole 27 of the head cover 6. It has the shape of an oil drain chamber 30.

A partition plate 31 is attached below the blow-by gas outlet hole 27 of the head cover 6, and a buffer space S is formed between the partition plate 31 and the head cover 6.

As shown in FIG. 2, this partition plate 31 has a mounting flange 32 formed at its peripheral end, and when this mounting flange 32 is attached to the upper wall and one side wall of the valve arm chamber 17, the partition plate 31 is inclined. It becomes like this.

Inclined downward end portion 31 that does not form the mounting flange 32
An opening 35 is formed in a, and this opening 35 faces the opposite side from the blow-by gas blow-up hole 24.

The opening 35 of the inclined downward end 31 a of the partition plate 31 acts as a communication part 35 between the valve arm chamber 17 and the buffer space S and the inside of the valve arm chamber 17 .

Further, a weir 33 and an oil return hole 34 are provided in the partition plate 31 located above the joint between the rocker arm 18 and the valve shaft end 20a of the intake/exhaust valve 12.

The operation of the blazer device configured as described above will now be described.

Blowby gas leaking into the crankcase 2 from the combustion chamber 9 passes through the communication hole 22 , the valve train cam chamber 13 , the tappet hole 23 , the push rod insertion hole (blowby gas blow-up hole) 24 in this order, and reaches the valve arm chamber 17 .
After entering the valve arm chamber 1, lubricate the locking arm 18, etc.
Along with a large amount of lubricating oil scattered to the oil cutout chamber 30 from the blow-by gas outlet hole (inlet of the oil cutout chamber) 27
The lubricating oil component is roughly separated during this time, and then passes through the buffer space S and enters the oil cutting chamber 30 from the blow-by gas outlet hole 27, where it is finely separated. After that, the air is sucked into the intake pipe 26.

The lubricating oil separated from the blow-by gas in the oil cutting chamber 30 flows out from the blow-by gas outlet 27 and flows down along the partition plate 31, and the oil, which is stopped by a weir 33 provided in the middle, flows from the oil return hole 34. It hangs over the valve shaft end 20a of the intake/exhaust valve 12, and the valve shaft 20
Lubricate.

Incidentally, as shown in FIG. 3, the partition plate 31 of the above embodiment has an oil return hole 3 instead of the weir 33 of the partition plate 31.
The partition plate portion 31b from 4 to the opening end may be formed into an upwardly sloped surface, and an oil sump and an oil return hole may be formed at the bottom thereof.

As described above, the present invention allows the large amount of lubricating oil contained in the blow-by gas to be separated from the oil as it flows from the valve arm chamber through the buffer space of the partition plate.
Since oil is separated more finely by the oil separation device of the breather device, oil separation performance can be improved without increasing the size of the oil separation device.

Moreover, the lubricating oil separated from the blow-by gas in the oil cutout chamber of the breather device is poured into the end of the valve shaft from the oil return hole of the partition plate to improve the lubrication performance of the intake and exhaust valve shafts.

In addition, the present invention has a simple structure in which the partition plate is arranged in an inclined manner in the valve arm chamber and an oil return hole is provided in the partition plate located above the end of the valve shaft, and it can be implemented at low cost. be able to.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a longitudinal sectional front view of a water-cooled vertical overhead valve engine, Fig. 2 is an enlarged sectional view of the main parts, and Fig. 3 is a longitudinal sectional view showing another embodiment of the partition plate. It is a diagram. B... Blazer device, S... Buffer space, 1... Engine, 6... Head cover, 17... Valve arm chamber,
20a... Valve shaft end, 21... Crank chamber, 24
...Blowby gas blow-up hole (push rod insertion hole), 27...Inlet (blowby gas outlet),
30...Oil cutting room, 31...Dividing board, 31a...3
1 inclined downward end, 34... oil return hole, 35...
Communication part.

Claims (1)

[Scope of utility model registration request] A blow-by gas blow-up hole 24 from the crank chamber 21 is provided on the lower surface of one side of the valve arm chamber 17 in the head cover 6 of the vertical overhead valve engine 1, and the end of the valve shaft 20 is inserted upward into the other side. The partition plate 31 is arranged at least near the other side of the upper space in the valve arm chamber 17 in an inclined manner such that the other side is downward, thereby forming a buffer space S on the partition plate 31, and forming a buffer space S between the buffer space S and the valve arm. The communication part 35 with the chamber 17 is divided by the partition plate 31.
An oil separation device 30 is provided near the other side edge, and an oil separation device 30 is provided at the top of the head cover 6, and an inlet 27 of this oil separation device 30 is opened at one side of the buffer space S. A vertical overhead valve engine characterized in that the section 31a is located above the valve shaft end 20a, and an oil return hole 34 is formed in the inclined downward end 31a of the partition plate 31 above the valve shaft end 20a. Blazer device in the crank chamber.