JPH07269327A - Vertical engine with breather - Google Patents

Abstract

PURPOSE:To prevent a large quantity of oil from flowing into a breather by providing both a breather and an upper opening of a vertical passage, which is used as an oil flowing down passage as well, at such a position as both do not overlap each other when viewed from the above and hanging an oil shielding plate from a ceiling wall of a head cover at a position between the two. CONSTITUTION:A head cover 3 covering a locker arm 2 is provided on the upper side of a cylinder head 1, while a vertical passage 4, or a combination blowby gas floating passage and oil flowing-down passage, is installed in the cylinder head 1. An upper opening 5 of the vertical passage 4 fronts on the inside of the head cover 3, while a breather 6 is arranged on a ceiling wall 38 of the head cover 3. Both breather 6 and upper opening 5 of the vertical passage 4 are placed at a place where both do not overlap each other when viewed from the above, and an oil shielding plate 7 is hung from a position between the two. Blowby gas 9 is deflected downward by the oil shielding plate 7, thereby restraining oil 8 from flying/coming to the breather 6. Thus, an inflow of so large quantity of oil as exceeding the oil separating capacity can be restrained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical engine equipped with a breather device, and more particularly to a vertical engine capable of suppressing oil discharge from the breather device.

[0002]

2. Description of the Related Art A conventional vertical engine with a breather device is shown in FIG. This is similar to the present invention
It has the following basic structure. That is, a head cover 103 that covers a rocker arm (not shown) is provided above the cylinder head 101, and a vertical hole passage 104 that doubles as a blow-by gas floating passage and an oil flow passage is provided inside the cylinder head 101. Upper opening 105
The head cover 103 from the lower side thereof, and the ceiling wall 138 of the head cover 103 is provided with the blazer device 1
06 is arranged.

In the structure having such a basic structure, the oil 108 on the cylinder head 101 is passed through the vertical hole passage 104.
Let it flow down. Then, the blow-by gas 109 is floated from the vertical hole passage 104 into the head cover 103, the oil mist contained in the blow-by gas 109 is separated by the breather device 106, and the blow-by gas from which the oil is removed is discharged from the breather device 106.

By the way, in the prior art shown in FIG.
When the oil 108 trying to flow down the vertical hole passage 104 is blown up into the head cover 103 by the blow-by gas 109, the oil 108 is blown by the blazer device 106.
There is no means to control it from coming to.

[0005]

The above-mentioned conventional techniques have the following problems. That is, when the oil 108 that is about to flow down the vertical hole passage 104 is blown up into the head cover 103 by the blow-by gas 109, this oil 1
08 may fly to the blazer device 106 together with the blow-by gas 109 guided along the inner surface of the head cover 103, and a large amount of oil exceeding the oil separation capability may flow into the blazer device 106. In this case, a large amount of oil is discharged from the blazer device 106 together with blow-by gas. The discharge of oil from the breather device 106 causes air pollution in the case of an open breather in which the blow-by gas outlet 110 is open to the atmosphere, and causes overrun in the case of a closed breather in which the blow-by gas outlet 110 is connected to an intake path. Become.

An object of the present invention is to provide a vertical engine with a breather device, which can suppress oil discharge from the breather device.

[0007]

According to the present invention, as illustrated in FIG. 1B, a head cover 3 for covering a rocker arm 2 (see FIG. 1A) is provided on an upper side of a cylinder head 1,
The cylinder head 1 is internally provided with a vertical hole passage 4 which also serves as a blow-by gas floating passage and an oil flow passage.
In the vertical engine with a breather device, the upper opening 5 is exposed inside the head cover 3 from the lower side, and the breather device 6 is arranged on the ceiling wall 38 of the head cover 3 as follows. Is characterized by.

That is, as illustrated in FIG. 1 (A),
When viewed from above the head cover 3, the breather device 6 and the upper opening 5 of the vertical passage 4 are provided at positions where they do not overlap each other, and the breather device 6 and the vertical passage 4 are provided.
1B, the oil shielding plate 7 is vertically provided from the ceiling wall 38 of the head cover 3 at a position between the upper cover 5 and the upper opening 5.

[0009]

The function and effect of the present invention are as follows. That is, as illustrated in FIG. 1B, even if the oil 8 that is about to flow down the vertical hole passage 4 is blown up into the head cover 3 by the blow-by gas 9, the blow-by gas that is guided along the inner surface of the head cover 3 is guided. 9 is deflected downward by the oil shield plate 7 to prevent the oil 8 from flying to the breather device 6. Therefore, the defect that a large amount of oil that exceeds the oil separation capacity flows into the breather device 6 is suppressed, and the defect that a large amount of oil is discharged from the breather device 6 together with the blow-by gas is suppressed. When the discharge of oil from the breather device 6 is suppressed, air pollution is suppressed in the case of an open breather in which the blow-by gas outlet 10 is opened to the atmosphere, and when the closed breather in which the blow-by gas outlet 10 is connected to an intake path is overrun. Runs are suppressed.

[0010]

Embodiments of the present invention will be described with reference to the drawings.
1 to 3 are views for explaining an embodiment of the present invention. In this embodiment, as shown in FIG. 3, a water-cooled in-line two-cylinder overhead cam type vertical gasoline engine with a breather device is used, and its configuration is as follows.

That is, as shown in FIG. 3 (B), the cylinder head 1 of this engine has cylinders 1 at the bottom thereof.
A pair of intake / exhaust valves 13 are attached to each of 1 and 12. As shown in FIG. 3A, the cylinder head 1
A valve operating chamber 14 is provided in an upper part of the valve operating chamber 14, and a valve operating cam shaft 16 provided with two pairs of valve operating cams 15 is horizontally installed in a lower part of the valve operating chamber 14. This valve camshaft 16 is used for the front and rear journals 1
7 and 18 and a central journal portion 19, which are fitted in the front and rear bearing bosses 20 and 21 and the central bearing boss 22 provided in the valve operating chamber 14 to support the valve operating cam shaft 16. At the upper part of the valve operating chamber 14, the valve operating cam shaft 1
A rocker arm pivot 23 parallel to 6 is horizontally mounted, and two pairs of rocker arms 2 are pivotably supported on the rocker arm pivot 23. The valve operating chamber 14 is covered with a head cover 3 from above, and the rocker arm 2 is covered with the head cover 3.

This engine is equipped with a lubricating device having the following structure. That is, as shown in FIG.
The oil suction port 27 of the oil pump 26 is immersed in the oil 8 in the oil pan 24, and the oil pressure feed passage 29 is led out from the oil discharge port 28 of the oil pump 26. The oil pressure feeding passage 29 passes through the bearing sliding portion 30 of the central bearing boss 22 and the valve operating cam shaft 16 in that order,
Front and rear bearing bosses 20 and 21 bearing sliding parts 31 and 32
Connected to.

Then, as shown in FIG. 3 (A), a pair of oil sump grooves 34 are provided in the inner bottom surface 33 of the valve operating chamber 14 between the adjacent bearing sliding portions 30, 31, 32. Figure 3
As shown in (B), a part of the valve operating cam 15 is immersed in the oil 8 accumulated in the oil reservoir groove 34, and the cam surface is wetted by the rotation of the valve operating cam shaft 16. At the same time, the oil 8 is splashed up by the cam top 35. The inner bottom surface of the oil sump groove 34 is formed in an arc surface shape along the rotation locus of the cam top 35 of the valve operating cam 15. An oil supply cylinder 36 is provided on the head cover 3.

According to this lubricating device, as shown in FIG. 3 (A), the oil 8 in the oil pan 24 is replaced by the oil pump 2.
6 through the oil pressure feeding passage 29, the bearing sliding portion 30 of the central bearing boss 22, the front and rear bearing bosses 20 and 21.
Are supplied to the respective bearing sliding portions 31 and 32 to lubricate them. Then, the oil 8 that has leaked from the bearing sliding portions 30, 31, and 32 is quickly accumulated in the oil reservoir groove 34. As shown in FIG. 3B, the oil 8 in the oil sump groove 34
Is wetted by the cam surface soaked in it, and flipped up by the cam top 35 to be supplied as oil mist to the rocker arm 2. If the oil 8 in the oil pan 24 is insufficient, the oil 8 is supplied from the oil supply cylinder 36.

In this engine, as shown in FIG. 3 (A), a vertical hole passage 4 serving as an oil flow-down passage is provided in the cylinder head 1. As shown in FIG. 1A, a total of four vertical passages 4 are formed downward from the four corners of the inner bottom surface 33 of the valve operating chamber 14. The upper opening 5 of this vertical hole passage 4
Are opened at the four corners of the inner bottom surface 33 of the valve operating chamber 14, as shown in FIG.
Each lower opening 37 shown in (B) is connected to the inside of the crank chamber (not shown). Therefore, the oil 8 overflowing from the oil sump groove 34 shown in FIG. 3A and the oil supplied from the oil supply port 36 shown in FIG. 3B flow down from the vertical hole passage 4 to the oil pan 24.

Further, this engine is provided with a breather mechanism having the following structure. That is, FIG. 1 (B)
The vertical hole passage 4 shown in (2) is used not only as an oil flow passage but also as a blow-by gas floating passage. The upper opening 5 of the vertical hole passage 4 is exposed inside the head cover 3 from below. A blazer device 6 is arranged on the head cover 3. The breather device 6 includes the ceiling wall 3 of the head cover 3.
8, the breather device 6 is provided with a blow-by gas inlet 39 and a blow-by gas outlet 10. The blow-by gas inlet 39 is equipped with a reed valve 40.

The specific structure of the breather device 6 is as follows. That is, as shown in FIG. 2A, on the lower side of the peripheral side wall 42 that is hung from the ceiling wall 38 of the head cover 3,
The lower side wall 44 shown in FIG.
As shown in FIG. 2A, a plurality of detour guide walls 41 are vertically provided from the ceiling wall 38 in a space surrounded by 2 and the lower side wall 44. As shown in FIG. 2C, the blow-by gas inlet 39 is provided on the lower side wall 44 and the reed valve 40 is provided on the upper side thereof.

According to this breather mechanism, as shown in FIG. 1B, the blow-by gas 9 in the crankcase floats up from the vertical hole passage 4 into the head cover 3. The blow-by gas 9 takes in the oil mist floating in the crankcase, the oil 8 flowing down in the vertical hole passage 4, the oil mist floating in the valve operating chamber 14, and the like. 39 to breather device 6
In the process of flowing into, the reed valve 40 separates the blow-by gas 9. Then, the blow-by gas containing the unseparated oil mist is the detour guide wall 41 shown in FIG.
Through the breather device 6 while meandering, contacting the detour guide wall 41 and the peripheral side wall 42, unseparated oil mist is condensed on these surfaces and separated and removed from the blow-by gas. The blow-by gas from which the oil has been removed is discharged from the blow-by gas outlet 10.

In this embodiment, in order to suppress the discharge of oil from the breather device 6, the following structure is adopted. That is, as shown in FIG. 1A, the adjacent cylinders 11
Breather device 6 between twelve adjacent rocker arms 2.2
Is provided, and the breather device 6 and the upper opening 5 of the vertical hole passage 4 are provided.
And are arranged in positions that do not overlap each other. At a position between the blazer device 6 and the upper opening 5 of the vertical passage 4,
As shown in FIG. 1B, the ceiling wall 38 of the head cover 3
A pair of oil shield plates 7 and 7 are vertically provided to a position lower than the blow-by gas inlet 39.

With this structure, as shown in FIG. 1 (B), even if the oil 8 which is going to flow down the vertical hole passage 4 is blown up into the head cover 3 by the blow-by gas 9, a pair of oil shields is provided. The blow-by gas 9 guided along the inner surface of the head cover 3 is deflected downward by the plates 7 and 7, and the oil 8 is prevented from flying to the breather device 6. Therefore, the defect that a large amount of oil that exceeds the oil separation capacity flows into the breather device 6 is suppressed, and the defect that a large amount of oil flows out from the breather device 6 together with the blow-by gas is suppressed.

Further, as shown in FIG. 1 (A), when viewed from above the head cover 3, the upper opening 5 of the vertical hole passage 4 provided at the lower left corner of the inner bottom surface 33 of the valve operating chamber 14 is formed. A cylindrical oil supply cylinder 36 is provided between the breather device 6 and the oil supply cylinder 36, as shown in FIG.
Are hung from the ceiling wall 38 of the head cover 3 to a position lower than the blow-by gas inlet 39. The oil supply cylinder 36 has the same function as the oil shield plate 7, and suppresses the oil 8 from flying to the breather device 6. Further, as shown in FIG. 3 (A), since a pair of rocker arms 2.2 on both sides of adjacent cylinders 11 and 12 are arranged near the lower side of the pair of oil shielding plates 7 and 7, The oil condensed on the surface of the oil shield plate 7 is dropped near the pair of rocker arms 2 and provided for lubrication.

Further, in this embodiment, as shown in FIG. 3B, the blow-by gas inlet 39 is provided at the breather device end portion 43 opposite to the oil splashing side of the valve operating cam 15. Therefore, a large amount of oil mist formed on the flip-up side of the cam top 35 does not easily enter the blow-by gas inlet 39 formed on the opposite side, and in this respect as well, the breather device 6 has its oil separation capability. Insufficient inflow of a large amount of oil that exceeds the limit is suppressed.

Further, in this embodiment, as shown in FIG. 3A, the peripheral side wall 42 of the breather device 6 is attached to the head cover 3.
Of the blow-by gas inlet 39 (see FIG. 3).
(See (B)). Therefore, the oil mist floating around the breather device 6 is blocked by the peripheral side wall 42 of the breather device 6, and the blow-by gas inlet 3
Inflow of the lower side wall 44 where 9 is present is hindered, and in this respect also, the defect that a large amount of oil that exceeds the oil separation capacity thereof flows into the blazer device 6 is suppressed. Further, since a pair of adjacent rocker arms 2.2 of the adjacent cylinders 11 and 12 are arranged below the peripheral side wall 42, the peripheral side wall 42 is formed.
Oil condensed on the surface of the rocker arm 7
・ Drip into 7 and use it for lubrication.

[Brief description of drawings]

FIG. 1 is a diagram illustrating an engine according to an embodiment, and FIG.
1A is a plan view of the cylinder head, and FIG. 1B is FIG.
It is a BB line sectional view of (A).

2A and 2B are views illustrating a head cover used in an engine according to an embodiment, FIG. 2A is a bottom view of the head cover, FIG. 2B is a bottom view of a lower side wall of the breather device, and FIG.
FIG. 3 is a sectional view taken along the line CC of FIG.

FIG. 3 is a diagram illustrating an engine according to an embodiment, and FIG.
3A is a vertical side view of a main part, and FIG. 3B is a sectional view taken along line BB of FIG. 3A.

FIG. 4 is a view corresponding to FIG. 1B of a main part of an engine according to a conventional technique.

[Explanation of symbols]

1 ... Cylinder head, 2 ... Rocker arm, 3 ... Head cover, 4 ... Vertical passage, 5 ... Upper opening, 6 ... Breather device, 7 ... Oil shield plate, 38 ... Ceiling wall.

Claims (1)

[Claims] 1. A cylinder head (3) for covering a rocker arm (2) is provided above a cylinder head (1),
A vertical hole passage (4) that also serves as a blow-by gas floating passage and an oil flow passage is provided in (1), and the upper opening (5) of this vertical hole passage (4) is placed inside the head cover (3). And a breather device (6) arranged on the ceiling wall (38) of the head cover (3) in a vertical engine with a breather device, as seen from above the head cover (3). 6) and the upper opening (5) of the vertical passage (4) are provided at positions where they do not overlap with each other, and the breather device (6) and the upper opening (5) of the vertical passage (4) are provided. A vertical engine with a breather device, characterized in that an oil shielding plate (7) is vertically provided from a ceiling wall (38) of the head cover (3) at a position between and.