JPH0730309U - Breather device for internal combustion engine - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] The blow-by gas leaked from the combustion chamber of the internal combustion engine into the crank chamber was separated with a breather device to remove most of the mist oil component of the lubricating oil, and then the intake silencer and air cleaner were installed. A breather device for an internal combustion engine that returns to the combustion chamber is provided with a technique for separating and removing the mist component of the lubricating oil mixed in the blow-by gas. [Composition] A timer T is provided on the fuel injection pump shaft 12, and the timer portion is connected to a blow-by gas extraction case 4
In the configuration of covering with, a breather chamber is configured in the case, and the breather chamber is in the rotation direction of the timer,
The partition and the baffle plate 6 are provided so that the blow-by gas flows in the opposite direction, and the outlet of the breather chamber and the intake passage are connected.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is an internal combustion engine in which blow-by gas leaking from the combustion chamber of an internal combustion engine into the crank chamber is separated and removed by a breather device to remove most of the mist oil component of lubricating oil, and then returned to the combustion chamber via an intake silencer and an air cleaner. Regarding the breather device of an engine, it relates to the technology for separating and removing the mist of lubricating oil mixed in blow-by gas.

[0002]

[Prior art]

 Techniques relating to blow-by gas reduction devices for internal combustion engines include Japanese Utility Model Publication No. 1-39845, Japanese Utility Model Publication No. 63-143710, Japanese Utility Model Publication No. 63-132813, and Japanese Utility Model Publication No. 61-21526. The technique described in Japanese Utility Model Laid-Open No. 5-17109 is known. Further, as shown in FIG. 7, a baffle plate 6 is attached to the blow-by gas extraction passage 7 in the blow-by gas extraction case 4 to prevent the mist of the lubricating oil from directly entering the blow-by gas extraction passage 7. It was.

[0003]

[Problems to be solved by the device]

 The present invention provides a breather chamber in the timer section. That is, the blow-by gas reduction device for an internal combustion engine of the present invention is an intake reduction, the height of the breather pipe to the intake passage, that is, the head is increased, the flow of the blow-by gas is increased, and the lubricating oil flows from the breather accordingly. It is easy to get out. Even in such a case, the present invention suppresses the blowing of the lubricating oil from the breather chamber.

[0004]

[Means for Solving the Problems]

 The problem to be solved by the present invention is as described above. Next, the means for solving the problem will be described. That is, in the structure in which the timer is provided on the fuel injection pump shaft and the timer portion is covered with a case, a breather chamber is formed in the case, and the breather gas is in a direction opposite to the rotation direction of the timer. A partition and a baffle plate are provided so as to allow the air to flow in, and the outlet of the breather chamber is connected to the intake passage.

[0005]

[Action]

 Next, the operation will be described. That is, the amount of blow-by gas increased with the increase in output of the internal combustion engine, but by letting the blow-by gas flow in the direction opposite to the rotation direction of the timer, it is possible to prevent the lubricating oil from blowing out together. Of. Further, when the blow-by gas is restricted from being blown out like a pleasure boat, the blow-by gas can be eliminated by completely returning the blow-by gas from the intake silencer 2 to the combustion stroke. However, if the lubricating oil is sucked into the air cleaner together with the blow big gas, there is a risk of deterioration of the turbine and rapid rotation of the internal combustion engine E. However, as in the present invention, the obstacle ribs 25, 26, 27 and 28 are provided, This problem could be prevented by opening the baffle plate opening 9 at a position opposite to the partition rib 8 of the baffle plate 6 with respect to the rotation direction a of the timer T.

[0006]

【Example】

 Next, examples will be described. FIG. 1 is a front view of an internal combustion engine equipped with a breather device for an internal combustion engine according to the present invention, FIG. 2 is a side view of an internal combustion engine equipped with a breather device for an internal combustion engine on the side of a deceleration mission, and FIG. Pump drive gear case 1 and blow-by gas extraction case 4 side view, FIG. 4 is a front cross-sectional view of gear case cover 21 and blow-by gas extraction case 4, FIG. 5 is blow-by gas extraction case 4 and baffle plate 6 6 is an inner side view of the blow-by gas extracting case 4, and FIG. 7 is an inner side view of the conventional blow-by gas extracting passage 7.

1 and 2, the overall configuration of an internal combustion engine equipped with the breather device for an internal combustion engine of the present invention will be described. The internal combustion engine E includes a crankcase 15, an oil pan 17 below the crankcase 15, an upper hood or valve arm chamber 20, a flywheel case 18 on the output side, a deceleration mission case 16 and the like. In the past, a breather case for extracting blow-by gas was provided in the bonnet or valve arm chamber 20, but in applications such as pleasure boats that do not like protruding floor surfaces, the bonnet or valve arm chamber is not available. It was no longer possible to install a breather case on the 20th part.

In the present invention, the breather case that cannot be provided in the bonnet or the valve arm chamber 20 is attached to the drive gear case 1 of the fuel pump 14 on the side of the crankcase 15 in the present invention. . However, if it is provided in this portion, the amount of mist oil is large, so unless the breather structure is perfected, the suction force of the intake silencer 2 causes the mist oil to pass through the breather hose 5 and be sucked. .

Particularly in a non-supercharged engine, pulsation occurs in the suction force of the intake silencer 2, so that the mist oil in the crankcase 15 passes through the breather chamber at the moment when the suction force is particularly strong, and The suction silencer 2 is sucked from the hose 5. In the embodiment of FIGS. 1 and 2, the fuel pump drive gear case 1 and the blow-by gas withdrawing case 4 are arranged on the side opposite to the flywheel case 18, and the flyby gas withdrawal case 4 is connected to the flywheel. The blow-by gas is sucked by the breather hose 5 up to the intake silencer 2 arranged on the upper side of the case 18.

Next, a description will be given with reference to FIGS. 3, 4, 5, and 6. As shown in FIG. 3, a fuel pump drive gear case 1 is configured, and the fuel pump drive gear case 1 is provided on the side of the crank case 15 on the side opposite to the deceleration mission case 16 and the flywheel case 18. It is fixed. A gear train for transmitting the rotation of the crankshaft to the timer T and the fuel pump 14 is arranged inside the fuel pump drive gear case 1, and is supported by a bearing on the fuel pump mounting bracket 19. It is configured to drive the fuel pump shaft 12.

The fuel pump drive gear case 1 is projected to the side of the crank case 15, and a gear case cover 21 is attached to the side opposite to the portion where the fuel pump mounting bracket 19 is attached. The opening 21 is covered with a blow-by gas withdrawing case 4. A timer T is arranged inside the gear case cover 21 and rotates together with the fuel pump shaft 12.

The main part of the present invention relates to the structure of the baffle plate 6, the baffle ribs 25, 26 and 27, and the baffle plate opening 9 provided inside the blow-by gas extraction case 4. As shown in FIG. 4, a lubrication opening 10 from a timer lubrication pipe 13 is opened in the central portion of the blow-by gas extraction case 4 to lubricate the timer T portion. Inside the blow-by gas extraction case 4, a blow-by gas guide space is formed in which baffle ribs 25, 26, 27 and partition ribs 8 project. The side of the timer T in the blow-by gas guide space is closed by a circular baffle plate 6. The opening from the baffle plate 6 to the blow-by gas guide space is only the blow-by gas extraction passage 7.

The blow-by gas extraction passage 7 opened in the baffle plate 6 is located in the immediate vicinity of the partition rib 8, but in the vicinity of the direction opposite to the rotation direction a of the timer T and the fuel pump shaft 12. The partition rib 8 is arranged on the side of the baffle plate opening 9 opposite to the rotation direction a of the timer T. Therefore, the blow-by gas discharged from the crank case 15 through the fuel pump drive gear case 1 to the case 4 through the blow-by gas from the gear case cover 21 enters the blow-by gas guide space through the baffle opening 9, and then blow-by gas is discharged through the blow-by gas discharge passage. It is necessary to exceed the inside of the blow-by gas withdrawal case 4 by more than half a round before reaching 7. During this time, the oil in the mist of the lubricating oil is attached to the wall of the blow-by gas extraction case 4 and collected, and only the gas is sucked into the intake silencer 2.

Even while the inside of the blow-by gas extraction case 4 is rotated from the baffle plate opening 9 to the blow-by gas extraction passage 7, the baffle ribs 25, 26, 27, and 28 that alternately project from the inside and the outside are detoured in a zigzag manner. It is necessary to do it. Finally, it is sent from the blowby gas extraction passage 7 through the blowby gas lid joint 32 to the intake silencer 2 from the breather hose 5. As shown in FIG. 6, a filter net 33 made of steel wool is arranged inside the blow-by gas extraction passage 7, and the lubricating oil mist is also filtered in this portion.

A portion of the blow-by gas extracting case 4 where the blow-by gas drops to become lubricating oil is returned to the oil pan from the drain return port 11. Further, as shown in FIG. 5, a shutter 39 made of a shape memory alloy is arranged in the rotation direction of the timer T, and when the temperature of the portion is high, the shutter 39 is closed, and when the temperature is low, May be opened to allow the lubricating oil accumulated in the portion during operation to be returned to the inside of the crankcase 15 while the internal combustion engine E is stopped.

[0016]

[Effect of device]

 Since the present invention is configured as described above, it has the following effects. First, the blow-by gas reduction device for an internal combustion engine of the present invention is an intake reduction, the height of the breather pipe to the intake passage, that is, the head is increased, the flow of the blow-by gas is increased, and the lubricating oil flows from the breather accordingly. It is easy to get out. In addition, the amount of blow-by gas increased as the output of the internal combustion engine increased, but the lubricating oil blows out together because the blow-by gas guide space is configured to flow the blow-by gas in the direction opposite to the rotation direction of the timer. Can be prevented. Secondly, when the blow-by gas is restricted from being blown out like a pleasure boat, the blow-by gas can be eliminated by completely returning the blow-by gas from the intake silencer 2 to the combustion stroke. . However, if the lubricating oil is sucked into the air cleaner together with the blowby gas, there is a risk of deterioration of the turbine and rapid rotation of the internal combustion engine E. However, as in the present invention, the baffle ribs 25, 26, 27, 28 are provided. By opening the baffle plate opening 9 at a position opposite to the rotation direction a of the timer T with respect to the partition rib 8 of the baffle plate 6, this problem could be solved.

[Brief description of drawings]

FIG. 1 is a front view of an internal combustion engine equipped with a breather device for an internal combustion engine according to the present invention.

FIG. 2 is a side view of a deceleration mission case side of an internal combustion engine equipped with an internal combustion engine breather device of the present invention.

FIG. 3 is a side view of a fuel pump drive gear case 1 and a blow-by gas extraction case 4;

FIG. 4 is a front sectional view of a gear case cover 21 and a blow-by gas extraction case 4.

FIG. 5 is an inner side view of a blow-by gas extraction case 4 and a baffle plate 6.

FIG. 6 is a rear cross-sectional view of a blow-by gas extraction case 4 portion.

FIG. 7 is an inner side view of a conventional blow-by gas extraction passage 7.

[Explanation of symbols]

 1 Fuel pump drive gear case 2 Intake silencer 4 Blow-by gas extraction case 5 Breather hose 6 Baffle plate 7 Blow-by gas extraction passage 8 Partition rib 9 Baffle plate opening 25, 26, 27, 28 Baffle rib

Claims (1)

[Scope of utility model registration request] 1. A structure in which a timer is provided on a fuel injection pump shaft and the timer portion is covered with a case,
A breather chamber is formed in the case, and the breather chamber is provided with a partition and a baffle so that the blow-by gas flows in the opposite direction to the rotation direction of the timer, and the outlet of the breather chamber is connected to the intake passage. A breather device for an internal combustion engine characterized by being configured.