JPH0524911U - Engine breather device - Google Patents

Abstract

(57) [Abstract] [Purpose] In a breather device for an engine, the direction in which blow-by gas flows is made downward so that the separated oil is not prevented from falling down by gravity. [Composition] Blow-by gas inlet chamber 1 inlet chamber outlet 4
Is opened at the upper part of the oil separation chamber 2, the outlet chamber inlet 5 of the blow-by gas outlet chamber 3 is opened at the lower part of the oil separation chamber 2, and the oil return hole 6 is opened at the bottom of the oil separation chamber 2. And configure.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an engine breather device.

[0002]

[Prior Art]

 2. Description of the Related Art As a breather device for an engine, in the related art, there is the following structure, for example, as shown in FIG. That is, the blow-by gas of the engine is guided from the crank chamber 7 through the push rod chamber 8 to the rocker arm chamber 9 covered with the head cover 13. The breather device 17 is configured by connecting the blow-by gas inlet chamber 1 to the outlet chamber 3 via the oil separation chamber 2 on the upper wall 13a of the head cover 13 above the rocker arm chamber 9. The oil separation chamber 2 is filled with steel wool 2a and the like, and the oil content in the blowby gas is captured and separated by the steel wool 2a. The blow-by gas flows in the oil separation chamber 2 in an upward direction from the inlet chamber 1 to the outlet chamber 3.

[0003]

[Problems to be solved by the device]

 The above conventional technique has the following problems. Since the flow direction of the blow-by gas is the upward direction from the inlet chamber 1 to the outlet chamber 3, when the oil component captured and separated by the steel wool 2a becomes droplets and falls downward due to gravity, this rising blow-by gas A vicious cycle occurs in which the air is blown up by the flow and mixes into the blow-by gas again. An object of the present invention is to make the flow direction of blow-by gas in the oil separation chamber downward so that the separated oil does not mix with the blow-by gas when it flows down due to gravity.

[0004]

Means for Solving the Problems The present invention adds the following improved structure to the above-mentioned conventional technique in order to achieve the above-mentioned object, for example, as shown in FIG. That is, the inlet chamber outlet 4 of the inlet chamber 1 is opened above the oil separation chamber 2, and the outlet chamber inlet 5 of the outlet chamber 3 is opened below the oil separation chamber 2. Then, an oil return hole 6 is opened at the bottom of the oil separation chamber 2.

[0005]

[Operation and effect of the device]

 The present invention works and effects as follows. The blow-by gas passes from the inlet chamber 1 through the net 2b of the inlet chamber outlet 4 opened at the upper part of the oil separating chamber 2 and enters the oil separating chamber 2. In the oil separation chamber 2, while the zigzag-shaped oil separation passage 19 is being blown down from the upper side to the lower side, the oil content in the blow-by gas is captured and separated by colliding with a large number of oil separation plates 18a, 18b. To be done. The separated oil becomes droplets and drops downward due to gravity, and returns into the rocker arm chamber 9 through the oil return hole 6. Further, the blow-by gas is folded back upward at the bottom of the oil separation chamber 2, passes through the net 2c of the outlet chamber inlet 5 of the outlet chamber 3, and exits from the outlet chamber 3. As described above, the blow-by gas flows in the oil separation chamber 2 in the downward direction, and when the separated oil flows down by gravity, the blow-by gas is not mixed with the blow-by gas again.

[0006]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of an engine breather device. In the figure, a cylinder head 12 and a head cover 13 are sequentially assembled above a cylinder block 11 of an engine 10. The cylinder head 11 is provided with an intake port 14 and an exhaust port 15, and the intake port 14 is connected to an air cleaner (not shown) via an intake pipe 16. The blow-by gas of the engine is guided from the crank chamber 7 through the push rod chamber 8 to the rocker arm chamber 9 covered with the head cover 13. The breather device 17 is provided on the upper wall 13a of the head cover 13 above the rocker arm chamber 9 and is configured as follows. That is, the blow-by gas inlet chamber 1 is connected to the outlet chamber 3 via the oil separation chamber 2. The inlet chamber outlet 4 of the inlet chamber 1 is opened above the oil separation chamber 2 and the outlet chamber inlet 5 of the outlet chamber 3 is opened below the oil separation chamber 2. Further, nets 2b and 2c are attached to the inlet chamber outlet 4 of the inlet chamber 1 and the outlet chamber inlet 5 of the outlet chamber 3, respectively. Further, in the oil separation chamber 2 intermediate between the inlet chamber outlet 4 and the outlet chamber inlet 5, a large number of oil separation plates 18a, 18b ... Are provided in a zigzag shape in an inclined posture, respectively, to form a zigzag shape. An oil separation passage 19 is formed. Further, an oil return hole 6 is opened at the bottom of the oil separation chamber 2 to return the separated oil into the rocker arm chamber 9. The outlet chamber 3 is communicated with the intake pipe 16 via a blow-by gas returning pipe 20 via an air cleaner. While the blow-by gas enters from the inlet chamber 1 of the breather device 17 and exits from the outlet chamber 3, the blow-by gas flows through the net 2b of the inlet chamber outlet 4 and the zigzag-shaped oil separation passage 19 of the oil separation chamber 2 from above to below. Further, it passes upward through the net 2c of the outlet chamber inlet 5 respectively. On the way through the oil separation chamber 2, the oil component in the blow-by gas is captured and separated. Then, the separated oil component becomes a droplet and drops downward due to gravity, and returns to the inside of the rocker arm chamber 9 through the oil return hole 6.

It is also possible to omit the large number of oil separation plates 18a, 18b, ... In the above-mentioned embodiment and form the zigzag oil separation passages 19 without forming them.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an engine breather device according to an embodiment of the present invention.

FIG. 2 is a diagram corresponding to FIG. 1 showing a conventional example.

[Explanation of symbols]

1 ... Inlet chamber, 2 ... Oil separation chamber, 3 ... Outlet chamber, 4 ... Inlet chamber outlet, 5 ... Outlet chamber inlet, 6 ... Oil return hole.

Claims (1)

[Scope of utility model registration request] 1. An engine blow-by gas inlet chamber (1)
In the breather device of the engine configured to communicate the oil with the outlet chamber (3) through the oil separation chamber (2), the inlet chamber outlet (4) of the inlet chamber (1) is connected to the oil separation chamber (3).
This oil separation chamber (2) opens at the top of (2).
A breather for an engine, characterized in that an outlet chamber inlet (5) of the outlet chamber (3) is opened in the lower part of the above, and an oil return hole (6) is opened in the bottom of the oil separation chamber (2). apparatus.