JPH0517109U - Blow-by gas combustion chamber reduction device for engine - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] After removing most of the mist oil component of the lubricating oil from the blow-by gas leaking from the combustion chamber of the engine to the crank chamber, the intake silencer 2 and the air cleaner are removed. The present invention relates to a device for reducing the mist oil component of lubricating oil mixed in blow-by gas to a device for reducing the mist oil component to the combustion chamber. [Structure] A side cover portion of a fuel pump drive gear case is configured as a blow-by gas extraction case, a breather hose 5 is interposed between the blow-by gas extraction case and an intake silencer 2, and the breather hose 5 is checked. The pulsation-preventing intake hole 8 provided with the valve 9 is opened.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a device for reducing blow-by gas leaking from a combustion chamber of an engine to a crank chamber to a combustion chamber through an intake silencer 2 and an air cleaner after separating and removing most of a mist oil component of lubricating oil with a breather device. Relates to a device for separating and removing the mist oil component of the lubricating oil mixed in the blow-by gas.

[0002]

[Prior Art]

 As a technique related to a blow-by gas combustion chamber reduction device for an engine, a technique as disclosed in Japanese Utility Model Publication No. 1-39845 is known.

[0003]

[Problems to be solved by the device]

 However, in the above-mentioned conventional technology, the blow-by gas is extracted from the bonnet or valve arm chamber above the engine, so the blow-by gas extraction case projects above the bonnet or valve arm, and the height of the engine increases. There was a problem that it became expensive. The higher engine height reduces the advantage in the case where the floor needs to be lowered as much as possible in order to improve the living performance, such as a pleasure boat. In addition, the fact that the mist oil leaks and the engine smells oily means that the cleanliness of a pleasure boat or the like is diminished.

Further, when the blow-by gas extraction case is provided on the side of the crankcase on the side of the crankcase as in the present invention, the amount of mist oil is larger than when the blow-by gas is extracted from the bonnet or the valve arm chamber. Therefore, there were problems such as oil leakage from the breather device and increased consumption of lubricating oil. Also, in a supercharged engine where the pulsation of intake air is severe, the pulsation of intake air causes a problem that the mist oil is sucked and the oil is sucked from the breather portion toward the breather hose 5 and leaks. The present invention solves the above problems.

[0005]

[Means for Solving the Problems]

 The problems to be solved by the present invention are as described above. Next, the means for solving the problems will be described. That is, the side lid portion of the fuel pump drive gear case 1 is configured as a blow-by gas extraction case 4, and a breather hose 5 is interposed between the blow-by gas extraction case 4 and the intake silencer 2. 5, a pulsation preventive intake hole 8 provided with a check valve 9 is opened.

[0006]

[Action]

 Next, the operation will be described. With the rotation of the engine E, blowby gas in the cylinder head leaks to the bonnet or the valve arm chamber 20. The blow-by gas flows into the crankcase 15 through the valve tappet chamber. Further, the crank case 15 is filled with mist oil, and when the blow-by gas is to be removed from the blow-by gas extraction case 4, the mist oil is sucked together and stays in the breather hose 5. Of. In order to eliminate this problem, the present invention uses a breather plate 6 and a steel wool 3 to shield the mist oil, and a check valve mechanism C for leveling the pulsating flow is interposed in the breather hose 5.

[0007]

【Example】

 Next, examples will be described. FIG. 1 is a front view of an engine equipped with the blow-by gas combustion chamber returning device of the present invention, FIG. 2 is a side view of the same deceleration mission case side, and FIG. 3 is a main part of the blow-by gas combustion chamber returning device of the present invention. Shown is a partial front sectional view of the blow-by gas extraction case 4 and the intake silencer 2, FIG. 4 is a side view of the blow-by gas extraction case 4, FIG. 5 is a front sectional view of the breather case 7 and the breather plate 6, and FIG. Is a side view of the breather case 7 and the breather plate 6, FIG. 7 is an inner side view of the breather case 7 and the breather plate 6, FIG. 8 is a front sectional view of the breather hose 5 and the check valve mechanism C, and FIG. 9 is a check valve mechanism. It is a front sectional view showing an example for C.

The overall configuration of the engine E will be described with reference to FIGS. 1 and 2. The 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. Conventionally, a blow-by gas extraction case was provided in the bonnet or valve arm chamber 20 in a protruding state. However, in applications such as pleasure boats where the protruding state of the floor is not desired, the bonnet or valve arm chamber 20 portion is used. It is no longer possible to install a blow-by gas extraction case in the.

In the present invention, the blowby gas extraction case 4 that cannot be provided in the bonnet or the valve arm chamber 20 is provided in the fuel pump drive gear case 1 side of the crankcase 15 in the present invention. Is. However, if it is provided in this portion, it contains a large amount of mist oil, and if the breather is not completely interposed, the mist oil will pass through the breather hose 5 and be sucked by the suction force of the intake silencer 2. Of.

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

Next, referring to FIG. 3, an essential part of the present invention will be described. A fuel pump drive gear case 1 is projectingly provided at a side surface of the crankcase 15. Inside the fuel pump drive gear case 1, a timer for driving the fuel pump, a cam shaft, a cam and the like are arranged. An opening is provided on the side surface of the fuel pump drive gear case 1, and a breather device is attached to the opening. The breather device comprises a breather plate 6, a breather case 7, a perforated steel plate 10, steel wool 3, and the like.

The breather plate 6 has a function of holding the steel wool 3 and a function of a shielding plate for shielding mist oil which is sucked out together with the blowby gas from the inside. 6 ・ As shown in Fig. 7, only a circular arc part of the disk shape is opened. Of the blowby gas and mist oil sucked from the arc opening, the mist oil contacts the steel wool 3 and is collected there. In addition, the mist oil that is not recovered by the steel wool 3 is configured to contact the perforated steel plate 10 and be recovered. The breather plate 6 is formed integrally with the breather case 7, and is fastened together with the breather case 7 and the blow-by gas extraction case 4 and fixed to the fuel pump drive gear case 1.

The blow-by gas extraction case 4 is configured so as to cover the opening 7a of the breather case 7 as shown in FIG. 4, and a connection portion 4a for connecting the breather hose 5 is formed. The breather hose 5 connects the connecting portion 4a of the blow-by gas extraction case 4 and the intake silencer 2 with each other. A check valve mechanism C composed of a check valve 9 and a pulsation preventive intake hole 8 is provided at a part of the breather hose 5.

In the case of a supercharged engine, the check valve mechanism C is apt to cause pulsation of intake air, and a strong suction force portion in the pulsation allows not only blow-by gas but also misted oil content. Since suction is performed, the intake force of the intake silencer 2 is made as uniform as possible so that a strong suction force that sucks mist oil is not generated. That is, the check valve mechanism C is constructed as shown in FIGS. 8 and 9, and is composed of the pulsation preventing intake hole 8, the check valve 9 and the ball locking bar 25. The pulsation-preventing intake hole 8 has a diameter of about 5 mm in order to prevent clogging. The check valve 9 opens and closes in accordance with the pulsation of the intake silencer 2 and serves to even out the pulsation. It is necessary to constantly inhale new ventilation from the portion of the check valve mechanism C, and if the portion is blocked, the effect will be reduced. Therefore, the ball locking bar 25 or the wire mesh is arranged in this portion. The check valve 9 is not completely closed.

[0015]

[Effect of the device]

 Since the present invention is configured as described above, it has the following effects. That is, since the blow-by gas extraction case 4 is provided on the side of the crank case 15 at the fuel pump drive gear case 1, the engine E can be installed more than at the bonnet or the valve arm chamber 20 as in the conventional case. The height of the floor can be reduced, and in the case of pleasure boats, the high part of the floor can be eliminated. In addition, the mist oil content leaked from the breather hose 5 and the clean boat was not polluted, and blowby gas was blown out, and the odor of the oil content no longer drifted. Further, in the case of a non-supercharged engine, since the pulsation of intake air is severe, there is a risk that the mist oil in the crankcase 15 will be sucked from the blow-by gas withdrawal case 4, but the check valve mechanism at the breather hose 5 part. By arranging C, it becomes possible to change the pulsation to a uniform intake pressure, and it is no longer necessary to suck the mist oil component by the strong suction force in the pulsation.

[Brief description of drawings]

FIG. 1 is a front view of an engine equipped with a blow-by gas combustion chamber returning device of the present invention.

FIG. 2 is a side view of the deceleration mission case side as well.

FIG. 3 is a partial front sectional view of a blow-by gas extraction case 4 and an intake silencer 2 showing a main part of the blow-by gas combustion chamber returning device for an engine of the present invention.

FIG. 4 is a side view of a blow-by gas extraction case 4.

FIG. 5 is a front sectional view of a breather case 7 and a breather plate 6.

FIG. 6 is a side view of the breather case 7 and the breather plate 6.

FIG. 7 is an inner side view of the breather case 7 and the breather plate 6.

FIG. 8 is a front sectional view of a breather hose 5 and a check valve mechanism C.

FIG. 9 is a front sectional view showing an embodiment for a check valve mechanism C.

[Explanation of symbols]

 C Check valve mechanism 1 Fuel pump drive gear case 2 Intake silencer 3 Steel wool 4 Blow-by gas extraction case 5 Breather hose 6 Breather plate 7 Breather case 8 Pulsation-preventing intake hole 9 Check valve

Claims (1)

[Scope of utility model registration request] 1. A side cover portion of a fuel pump drive gear case 1 is configured as a blow-by gas extraction case 4, and a breather hose 5 is interposed between the blow-by gas extraction case 4 and an intake silencer 2, and the breather is provided. A blow-by gas combustion chamber returning device for an engine, characterized in that a pulsation preventing intake hole 8 provided with a check valve 9 is opened in the hose 5.