JPH0634108U - Engine breather device - Google Patents

Abstract

(57) [Abstract] [Purpose] To further promote oil separation of the breather device while suppressing cost increase with a simple configuration. [Structure] Two oil separation plates 5 are provided in a breather inlet chamber 2A of a breather device 1. The oil separating plate 5 is the first separating plate 5 located near the inflow port 11 of the breather gas G.
A and a second separation plate 5B located near the breather hole 8 of the breather valve holder 4, and the first separation plate 5A and the second separation plate 5B form a breather gas flow path R in a zigzag shape.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an engine breather device, and more particularly to a technique for providing an oil separation plate in a breather inlet chamber.

[0002]

[Prior art]

 While the engine is running, some exhaust gas and air-fuel mixture blows out from the combustion chamber to the crank chamber as blow-by gas, so a breather device is installed to breathe and the oil is separated from the blow-by gas. . The basic structure of the engine breather device of the present invention is constructed as shown in FIGS.

That is, the breather chamber 102 is provided between the cylinder head 121 of the engine E and the head cover 122, and the breather chamber 102 is divided into a breather inlet chamber 102A and a breather outlet chamber 102B by a plate-shaped breather valve holder 104. , A blow-by gas G inlet 111 is formed in the lower part of the breather inlet chamber 102A, a purified air outlet 113 is communicated with the upper part of the breather outlet chamber 102B, and a breather hole is formed in the breather valve holder 104 as shown in FIG. 108, the plate-shaped breather valve 106 and the stopper 107 are sequentially arranged on the surface of the breather valve holder 104 on the breather outlet chamber 102 B side, and the oil separation plate 10 is formed on the surface of the breather valve holder 104 on the breather inlet chamber 102 A side. 5 are arranged and they are fixed to the breather valve holder 104.

In the prior art, the breather valve 106 faces the breather hole 108. Further, as shown in FIG. 9, the oil separating plate 105 is provided at a position close to the breather hole 108 of the breather valve holder 104, and the oil separating plate 105 allows the blow-by flow that flows in from the inflow port 111. It is configured to separate oil mist contained in the gas G. The purified air G ₀ separated by the breather device is recirculated to the intake system via an air cleaner (not shown).

[0005]

[Problems to be solved by the device]

 The above conventional technique has the following problems. For example, in a 250cc engine or more, as the displacement increases, the blowby gas increases, and a little oil mist is included in the purified air that flows back from the breather device to the intake system. As a result, sludge may accumulate on the intake valve and oil may leak from the air cleaner.

In order to solve the above-mentioned inconvenience, it is conceivable that steel wool or the like is additionally provided in the breather inlet chamber 102A instead of the oil separating plate 105 or in addition to the oil separating plate 105. The structure for mounting steel wool, etc. becomes complicated and costs rise. Therefore, in order to solve the above-mentioned inconvenience, the device shown in FIG. It arranges the oil separation plate 5B on the surface of the breather valve holder 4 on the side of the breather inlet chamber, adds another oil separation plate 5A to the breather inlet chamber 102A, and attaches them to the breather valve holder. It is configured to be fixed to 4.

However, in the above-mentioned prior invention, oil separation is not always sufficient, and there is a possibility that oil mist may still remain in the purified air that is recirculated from the breather device to the intake system. The present invention has been made in view of such circumstances, and in an engine with a relatively large displacement (for example, 250 cc or more), to further promote oil separation of the breather device while suppressing cost increase. Is a technical issue.

[0008]

[Means for Solving the Problems]

 Means adopted by the present invention to achieve the above object is that in the breather device of the above-mentioned conventional structure, two oil separating plates 5 are provided in the breather inlet chamber 2A, and the oil separating plate 5 is located near the inlet 11. And a second separation plate 5B located nearer to the breather hole 8, and the first separation plate 5A and the second separation plate 5B make the breather gas flow path R zigzag. It is characterized by being formed.

[0009]

[Operation and effect of the device]

 In the present invention, the breather gas flow path R is formed in a zigzag shape in the breather inlet chamber 2A by the first separation plate 5A and the second separation plate 5B, so that the blow-by gas G travels in a zigzag shape in the breather gas flow path. Moreover, the first separation plate 5A and the second separation plate 5B collide with each other to effectively separate the oil. As a result, the oil separation of the breather device can be further promoted as compared with the conventional example and the previously devised example. Further, since the structure of the present invention is a simple structure in which the first separating plate 5A is added to the conventional example, the cost is not increased as compared with the previous example.

[0010]

【Example】

 First, the engine adopting the present invention will be briefly described. FIG. 5 is a plan view of the engine, and FIG. 6 is a side view of the engine. This engine E is a vertical gasoline engine of an overhead valve type. As shown in FIGS. 5 and 6, a cooling fan 23 is provided on one side of the engine body 20 and is covered with a fan cover 24, and a cylinder head 21 is provided. An air cleaner 26 is provided on one side of the cylinder head 21 via an intake pipe 25, a muffler 28 is provided on the other side of the cylinder head 21 via an exhaust pipe 27, and a fuel tank 32 is mounted overhead.

Reference numeral 22 in these drawings is a head cover made of aluminum casting, 12 is a gas return pipe for returning blow-by gas G to an intake system via an air cleaner 27, and 30 is a head cover near the center of gravity of the engine E. Is a screw seat formed on the top surface of the. The screw seat 30 is used for suspending the engine E by screwing and fixing a hook (not shown) into the screw hole 31.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of a main part of an overhead valve type vertical engine, FIG. 2 shows a breather valve holder according to a first embodiment, and FIG. 1A is a side view of the main part and FIG. ) Is a bottom view of the main part, and FIG. 3 is a plan view of the cylinder head with the head cover removed. As shown in FIG. 1, a breather device 1 according to the present invention is provided with a lateral projecting device wall 1A formed by a cylinder head 21 and a head cover 22 on the upper lateral side of a push rod 19 of a rocker arm chamber 10A. It is provided in the vessel wall 1A.

The rocker arm chamber 10A is formed in the head cover 22 of the engine E, and a blow-by gas outlet 9 communicating with the crank chamber is formed on the intake / exhaust valve shaft 18 side of the rocker arm chamber 10A. The blow-by gas G reaches the inside of the breather device 1 through the outlet 9, the rocker arm chamber 10A, the push rod chamber 10B, and the inflow port 11 of the breather device 1 in order.

The breather device 1 according to the present invention, as shown in FIGS. 1 to 3, has the same basic structure as the conventional example. That is, the breather device 1 is a plate mounted on the breather chamber 2 formed in the lateral projecting device wall 1A and the contact recess (reference numeral 22d in FIG. 3) between the cylinder head 21 and the head cover 22. The breather valve holder 4 has a tongue-shaped breather valve 6 fixed to the breather valve holder 4, a lift limiting stopper 7 for the breather valve 6, and two oil separating plates 5B and 5A.

The breather chamber 2 is divided into a breather inlet chamber 2A and a breather outlet chamber 2B by a plate-shaped breather valve holder 4, and the inflow port 11 of the blow-by gas G is pushed as shown in FIG. The rod chamber 10B and the breather inlet chamber 2A are opened, and the purification outlet 13 is opened in the breather outlet chamber 2B and communicates with the gas return pipe 12.

The first embodiment will be described below. A breather hole 8 is opened in the breather valve holder 4, a plate-shaped breather valve 6 is made to face the breather hole 8, and the breather valve 6 and the stopper 7 are sequentially placed on the breather outlet chamber 2B side of the breather valve holder 4. In addition to being fixed, two oil separating plates 5A and 5B are fixed to the breather valve holder 4 on the side of the breather inlet chamber 2A. The breather valve 6, the stopper 7, and the oil separating plate 5B are fixed to the breather valve holder 4 together with a fixture 7b. One of the oil separating plates 5A is fixed to the breather valve holder 4 by spot welding.

Of the oil separating plates 5A and 5B, those located near the inflow port 11 are defined as the first separating plate 5A, and those located near the breather hole 8 are defined as the second separating plate 5B. To do. The first separating plate 5A and the second separating plate 5B should be arranged such that their right ends or left ends are bent upward, and the bent parts 5d are brought close to the respective left and right device walls 1A and 1B. Thus, the breather gas flow path R is formed in a zigzag shape. Reference numeral 5e in FIGS. 2 (A) and 2 (B) is a reinforcing ridge portion formed as a ridge on the bottom surface of the second separating plate 5B.

With the above configuration, the blowby gas G flowing into the breather inlet chamber 2A from the inflow port 11 collides with the first separating plate 5A and inverts, as shown in FIG. 1, and then the first separating plate 5A. To the breather outlet chamber 2B through the breather hole 8 through the gap between the second separating plate 5B and the vessel wall 1A. That is, while the blow-by gas G travels in the breather gas flow path R in a zigzag manner, the blow-by gas G collides with the first separation plate 5A and the second separation plate 5B to effectively separate oil. The oil-separated engine oil reaches the inside of the oil pan from the inflow port 11 through the push rod chamber 10B, and the oil-separated purified air G ₀ reaches the air cleaner 26 through the purified air outlet 13.

FIG. 4 shows a second embodiment of the present invention. FIG. 4A is a vertical cross-sectional side view of the breather device, and FIG. 4B is an enlarged vertical front view of the main part thereof. In this embodiment, instead of fixing the first separating plate 5A and the second separating plate 5B to the breather valve holder 4, the breather among the head fixing screw seats 14 and 15 of the cylinder head 21 shown in FIG. The head fixing screw seat 15 in the inlet chamber 2A is used to fix the head fixing bolts 16.

That is, the first separating plate 5A is fixed to the head fixing screw seat 15 with the head fixing bolt 16, and a screw hole 16a is formed in the head of the head fixing bolt 16 and the screw hole 16a is formed. By screwing the fixing bolt 18, the second separating plate 5B is fixed above the first separating plate 5A via the space collar 17. Then, as shown in FIG. 4 (A), the first separation plate 5A and the second separation plate 5B have their right and left edges abutted against the respective device walls 1A and 1B in a side view, and The breather gas flow paths R are formed in a zigzag shape by providing them in a bird arrangement. As a result, the same action and effect as those of the first embodiment can be obtained.

In the second embodiment, the first separating plate 5A and the second separating plate 5B are fixed with the bolts 16 and 18, respectively, but they may be fixed with one head fixing bolt 16. Further, the present invention is characterized by the arrangement of the first separating plate 5A and the second separating plate 5B of the breather device, so that the breather chamber 2 is provided on the side of the rocker arm chamber 20 of the engine E as in the present embodiment. Not limited to the structure provided, for example, the structure in which the breather chamber 2 is provided in a portion close to the crank chamber such as the tapet chamber that drives the push rod 19 can be applied.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an essential part of an overhead valve vertical engine according to an embodiment of the present invention.

FIG. 2 shows a breather valve holder according to a first embodiment,
The figure (A) is the side view, and the figure (B) is the bottom view.

FIG. 3 is a plan view of a cylinder head of an overhead valve vertical engine according to an embodiment of the present invention, showing a state in which a head cover is removed.

4A and 4B show a second embodiment, FIG. 4A is a vertical sectional side view of a breather device, and FIG. 4B is an enlarged vertical sectional front view of a main part thereof.

FIG. 5 is a plan view of an overhead valve vertical gasoline engine according to an embodiment of the present invention.

FIG. 6 is a side view of an overhead valve vertical gasoline engine according to an embodiment of the present invention.

FIG. 7 is a side view of the breather valve holder according to the previously devised example.

FIG. 8 is a view equivalent to FIG. 7 according to the prior art.

FIG. 9 is a view equivalent to FIG. 1 according to the prior art.

[Explanation of symbols]

E ... Engine, 1 ... Breather device, 2 ... Breather chamber, 2A ... Breather inlet chamber, 2B ... Breather outlet chamber, 4 ... Breather valve holder, 5 ... Oil separation plate,
5A ... first separation plate, 5B ... second separation plate,
6 ... Breather valve, 7 ... Stopper,
8 ... Breather hole, 11 ... Blow-by gas inlet,
13 ... Purification outlet, G ... Blow-by gas,
R ... Breather gas flow path.

Claims (1)

[Scope of utility model registration request] 1. A breather chamber (2) is provided in the engine (E),
The breather chamber (2) is divided into a breather inlet chamber (2A) and a breather outlet chamber (2B) by a plate-shaped breather valve holder (4), and an inlet (11) for blow-by gas (G) is divided into a breather inlet chamber (2A). )
Open the air purifying outlet (13) to the breather outlet chamber (2
B) and breather hole (8) in the breather valve holder (4)
The breather hole (8) so that the breather valve (6) in the form of a plate faces the breather hole (8), and the breather outlet chamber (2B) of the breather valve holder (4).
A breather device for an engine, in which the breather valve (6) and the stopper (7) are fixed in order on the side, in the breather inlet chamber (2A), two oil separation plates (5) are provided. (5) consists of a first separation plate (5A) located near the inflow port (11) and a second separation plate (5B) located near the breather hole (8). A breather device for an engine, characterized in that a breather gas passage (R) is formed in a zigzag shape by (5A) and a second separating plate (5B).