JP2002097919A - Breather device for engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To collect the dust in the atmospheric air taken in a crank case using the oil contained in blow-by gas. SOLUTION: An oil reservoir case 1 is arranged in the lead-out end opening 2a of a breather pipe 2. A guide cylinder 5 is installed on the ceiling wall 7 of the oil reservoir case 1, and the upper end section of the guide cylinder 5 is fitted in the lead-out end opening 2a of a breather pipe 2, and the lower end section of the guide cylinder 5 is provided perpendicularly toward the inner bottom section 8 of the oil reservoir case 1, and a vent 9 is provided in the oil reservoir case 1 around the guide cylinder 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a breather device for an engine, and more particularly, to a breather device for discharging blow-by gas and introducing air through a single breather pipe.

[0002]

2. Description of the Related Art Some conventional breather devices for an engine perform ventilation in a crankcase using a single breather pipe open to the atmosphere. In other words, using the movement of the piston, the blow-by gas is discharged into the atmosphere from the breather pipe when the pressure in the crankcase is increased, and the atmosphere is released from the same breather pipe when the pressure in the crankcase is reduced. Take in. This promotes ventilation in the crankcase and suppresses the generation of sludge due to the retention of blow-by gas.

[0003]

However, the prior art has the following problems. First, when used in a place with a lot of dust, the dust is sucked in together with the air, and this gets into the crankcase, causing wear and seizure of the sliding portion of the bearing metal.

On the other hand, along with the release of the blow-by gas, the oil component contained in the blow-by gas is also discharged into the atmosphere, causing air pollution and the like.

[0005] In order to solve such a problem, for example, it is conceivable to provide an air cleaner at the tip of the breather pipe. However, when ventilating using one breather pipe as an air supply / exhaust port, the filter is clogged by the oil component in the blow-by gas, and the filtration performance is significantly reduced.

[0006]

Means for Solving the Problems In order to solve the above problems,
The present invention is characterized in that it is configured as follows. That is, in the breather device of the engine which derives the breather pipe 2 communicating with the crankcase and discharges blow-by gas into the atmosphere from the discharge end opening 2a of the breather pipe 2, the oil is supplied to the discharge end opening 2a of the breather pipe 2. A reservoir case 1 is provided, and a guide cylinder 5 is provided on a ceiling wall 7 of the oil reservoir case 1.
The lower end portion of the guide tube 5 is vertically installed toward the inner bottom portion 8 of the oil reservoir case 1, and is ventilated around the guide tube 5 to the oil reservoir case 1. A mouth 9 is provided.

[0007]

According to the present invention, an oil reservoir case is provided at the opening of the outlet end of the breather pipe, and the lower end of a guide cylinder provided on the ceiling wall of the oil reservoir case is suspended toward the inner bottom of the oil reservoir case. If the blow-by gas discharged from the crankcase enters the oil reservoir case through the breather pipe, it is guided by the guide cylinder and collides with the inner bottom, and the oil component adheres to the inner bottom. . Therefore, the amount of the oil component in the blow-by gas discharged into the atmosphere can be reduced.

Since the oil reservoir case is provided with a vent around the guide cylinder, when air is supplied to the crankcase, the air sucked from the vent is guided by the guide cylinder and the oil reservoir case is provided. The oil component that has collided with the inner bottom portion catches dust contained in the atmosphere, so that it is possible to prevent dust from entering the crankcase.

Since the oil contained in the blow-by gas is used as the oil for capturing dust, unnecessary oil can be used effectively, and there is no need to supply oil again.

[0010] Compared with the case where a filter or the like is provided, there is no particular thing that can be the resistance to the introduction of air (resistance to discharge of blow-by gas), so that the negative pressure (high pressure) in the crankcase is quickly suppressed. Can be. (Continuing negative pressure or high pressure in the crankcase lowers the sealing performance of the gasket, causing problems such as intrusion of dust or leakage of oil from the gasket.)

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an oil reservoir case 1 provided in a breather device according to an embodiment of the present invention. The oil reservoir case 1 is provided in a leading end opening 2a of a breather pipe 2 communicating with a crankcase (not shown), and includes a case body 3, a cap portion 4,
And a guide cylinder 5.

The case body 3 has a cylindrical shape having an open upper end and a closed lower end.
a is provided. Here, four notches 6a are provided, but the number is not limited to four.

The cap portion 4 is formed in a cylindrical shape having a ceiling wall 7 having an opening at the lower end and a hole 7a having a diameter smaller than the inner diameter at the upper end. The inner diameter of the lower end opening is configured to be larger than the outer diameter of the opening of the case main body 3, and the case main body 3 is screwed or otherwise formed so as to cover the opening of the case main body 3.
And joined. On the other hand, the guide cylinder 5 is press-fitted into a hole 7 a provided in the ceiling wall 7.

The guide tube 5 has a lower end vertically extending toward the inner bottom 8 of the case body 3 and an upper end fitted into the leading end opening 2a of the breather pipe 2. Also, the notch 6a and the ceiling wall 7 of the cap portion 4
The guide tube 5 is made to protrude toward the inner bottom portion 8 with a sufficient depth so that the ventilation holes 9 (four in the example shown) formed by (4) face the outer peripheral wall of the guide tube 5. That is, the guide cylinder 5 is formed such that the air passage 20 in the guide cylinder 5 is formed toward the inner bottom 8 of the oil reservoir case 1.
And project toward the inner bottom portion 8 so that the ventilation path 21 formed by the inner wall of the case main body 3 and the outer wall of the guide cylinder 5 is formed toward the inner bottom portion 8 of the case main body 3. Let it. The guide cylinder 5 not only guides the blow-by gas discharged from the crankcase to the inner bottom portion 8 of the oil reservoir case 1 but also guides the air sucked from the vent 9 to the inner bottom portion 8 of the oil reservoir case 1. It also fulfills.

An oil discharge plug 30 is provided on the inner bottom portion 8 of the oil reservoir case 1 so that the oil accumulated in the case can be appropriately discharged. Further, although the cap part 4 and the guide cylinder 5 are configured as separate bodies, the essence of the present invention is not affected even if they are integrally formed.

The present embodiment having the above configuration operates as follows. First, when the inside of the crankcase is under high pressure, blow-by gas discharged from the crankcase flows into the oil reservoir case 1 through the breather pipe 2. At that time, the blow-by gas is guided by the guide cylinder 5 and collides with the inner bottom portion 8 of the oil reservoir case 1. The oil component contained in the blow-by gas adheres to the inner bottom portion 8, and the remaining gas is discharged from the vent 9 into the atmosphere.

On the other hand, when the inside of the crankcase is under a negative pressure, the air flows into the oil reservoir case 1 from the vent hole 9. Since the guide tube 5 protrudes toward the inner bottom portion 8 so that the ventilation path 21 formed by the inner wall of the case body 3 and the outer wall of the guide tube 5 is formed toward the inner bottom portion 8 of the case body 3. The air flowing from the vent 9 is guided by the outer wall of the guide tube 5 and collides with the inner bottom portion 8 of the oil reservoir case 1. At this time, the dust contained in the air is trapped by the oil accumulated in the inner bottom portion 8, and the purified air passes through the air passage 20 in the guide cylinder 5 and is fed to the breather pipe 2.
Then it is sent to the crankcase.

FIG. 3 shows a modification of the above embodiment. In this modification, the inner bottom of the case body 3 is partitioned into a first inner bottom 8a and a second inner bottom 8b by a cylindrical lower partition wall 11. The height of the lower partition wall 11 is lower than the height of the outer peripheral wall 6 of the case body 3.

On the other hand, a cylindrical upper partition wall 12 is provided on the ceiling wall 7 of the cap portion 4, and the diameter of the lower end opening of the upper partition wall 12 is larger than the diameter of the upper end opening of the lower partition wall 11. However, it is configured to be smaller than the outer peripheral diameter of the case body 3. Further, the height of the upper partition wall 12 is configured to be lower than the height of the outer peripheral wall 6 of the case body 3. Therefore, when the case body 3 and the cap part 4 are joined, the upper partition wall 12 is located between the lower partition wall 11 and the outer peripheral wall 6 and the lower partition wall 11 and the ceiling wall 7
And a gap is formed between the upper partition wall 12 and the second inner bottom 8b. This gap serves as a passage for the blow-by gas or the atmosphere. It is to be noted that a cutout 6a (accordingly, a vent 9) is provided in the upper part of the outer peripheral wall 6 of the case body 3 as in the above-described embodiment.

The above modification has the following functions and effects. That is, the blow-by gas sent from the crankcase is first guided by the guide cylinder 5 and collides with the first inner bottom portion 8a, and then guided by the lower partition wall 11 and the upper partition wall 12 and the second inner bottom portion. 8b. Due to this collision, the oil component contained in the blow-by gas adheres to the first inner bottom 8a and the second inner bottom 8b. The blow-by gas also collides with the ceiling wall 7, but the oil adhering to the ceiling wall 7 eventually drops and accumulates at the inner bottom. As described above, since the number of times the blow-by gas collides with the wall surface increases, the oil component in the blow-by gas finally released to the atmosphere can be further reduced.

On the other hand, when the air is sent to the crankcase, the number of times that the sucked air collides with the inner bottom where the oil is accumulated increases, so that the possibility that the dust in the air is caught by the oil increases, and the dust is further increased. Less air is sent to the crankcase.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view illustrating a configuration of an embodiment of the present invention.

FIG. 3 is a longitudinal sectional view showing a modification of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Oil storage case, 2 ... Breather pipe, 2a ... Opening end of the breather pipe, 5 ... Guide cylinder, 7 ... Ceiling wall, 8 ... Inner bottom, 9 ... Vent.

Claims (1)

[Claims] 1. A breather device for an engine, which derives a breather pipe (2) communicating with a crankcase and discharges blow-by gas into the atmosphere from an outlet end opening (2a) of the breather pipe (2). An oil sump case (1) is provided in the outlet end opening (2a) of (2), and a ceiling wall of the oil sump case (1) is provided.
(7) is provided with a guide tube (5), and the upper end of the guide tube (5) is fitted into the leading end opening (2a) of the breather pipe (2), and the lower end of the guide tube (5) is The oil reservoir case (1) is provided with a ventilation port (9) vertically extending toward the inner bottom portion (8) of the oil reservoir case (1) and provided around the guide tube (5). Engine breather device.