JP6576308B2 - engine - Google Patents

Description

  The present invention relates to an engine, and more particularly to an engine capable of reducing oil consumption.

Conventionally, there are the following engines (for example, see Patent Document 1).
A cylinder head, a cylinder head cover assembled on top of the cylinder head, and a breather chamber disposed in the cylinder head cover;
The breather chamber includes an oil discharge guide chamber, a blow-by gas passage chamber disposed above the oil discharge guide chamber, and an oil discharge pipe led downward from the oil discharge guide chamber.
The cylinder head has an oil sump, and the oil outlet pipe outlet is immersed in the oil stored in the oil sump.

  According to this type of engine, there is an advantage that blow-by gas in the cylinder head cover can be prevented from entering the breather chamber from the oil discharge pipe with the oil in the oil reservoir.

  In Patent Document 1, when the pressure difference between the cylinder head cover and the breather chamber increases, the oil in the oil reservoir blows up from the oil discharge pipe to the breather chamber and adheres to the ceiling wall of the blow-by gas passage chamber. It may reach the blow-by gas outlet of the breather chamber.

Japanese Utility Model Publication No. 57-171110 (see FIGS. 2 and 3)

<Problem> Oil consumption may increase.
In Patent Document 1, the oil in the oil reservoir blows up to the breather chamber, passes through the ceiling wall of the blow-by gas passage chamber, reaches the blow-by gas outlet, and is taken out of the breather chamber by blow-by gas, resulting in a large amount of oil consumption. There is a risk.

  The subject of this invention is providing the engine which can reduce oil consumption.

Invention specific matters of the invention according to claim 1 are as follows.
As illustrated in FIG. 6, a cylinder head (1), a cylinder head cover (2) assembled on the upper part of the cylinder head (1), and a breather chamber (4) disposed in the cylinder head cover (2) are provided. ,
The breather chamber (4) is led downward from the oil discharge guide chamber (7), the blow-by gas passage chamber (8) disposed above the oil discharge guide chamber (7), and the oil discharge guide chamber (7). Oil drain pipe (16)
In the engine, the cylinder head (1) includes an oil reservoir (17), and the pipe outlet (16a) of the oil discharge pipe (16) is immersed in the oil (18) accumulated in the oil reservoir (17).
As illustrated in FIG. 6, the breather chamber (4) is suspended downward from the ceiling wall (8a) of the blow-by gas passage chamber (8) toward the pipe inlet (16c) of the oil discharge pipe (16). An engine comprising an oil receiving rod (24).

(Invention of Claim 1)
The invention according to claim 1 has the following effects.
<Effect> Oil consumption can be reduced.
As illustrated in FIG. 6, in the present invention, even if the oil (18) in the oil sump (17) blows up from the oil discharge pipe (16) to the breather chamber (4), the oil (18) remains in the oil receiving rod ( 24) and is scattered around and hardly adheres to the ceiling wall (8a) of the blow-by gas passage chamber (8). For this reason, it is difficult for the blown-up oil (18) to travel along the ceiling wall (8a) to the blow-by gas outlet (6), and as a result, the oil (18) is blown by the breather chamber (4). Inconveniences that are taken out from the oil can be suppressed, and oil consumption can be reduced.

(Invention of Claim 2)
The invention according to claim 2 has the following effect in addition to the effect of the invention according to claim 1.
<Effect> Oil consumption can be reduced.
As illustrated in FIG. 6, in the present invention, the oil (18) attached to the ceiling wall (8a) of the blow-by gas passage chamber (8) travels along the oil collecting guide surface (8b) by its own weight to the oil receiving rod ( 24), and travels along the oil receiving rod (24) and falls to the pipe inlet (16c) of the oil discharge pipe (16). For this reason, the oil (18) adhering to the ceiling wall (8a) of the blow-by gas passage chamber (8) is unlikely to be transmitted to the blow-by gas outlet (6) through the ceiling wall (8a), thereby reducing oil consumption. can do.

(Invention of Claim 3)
The invention according to claim 3 has the following effect in addition to the effect of the invention described in claim 1 or claim 2.
<Effect> Oil consumption can be reduced.
As illustrated in FIG. 6, in the present invention, the oil (18) blown up from the discharge pipe (16) and deflected obliquely upward by the oil receiving rod (24) is received by the oil receiving plate (25), The oil does not reach the ceiling wall (8a) of the blow-by gas passage chamber (8) and the oil (18) does not easily reach the blow-by gas outlet (6) through the ceiling wall (8a), reducing the oil consumption. can do.
The oil (18) transmitted through the oil receiving rod (24) flows into the discharge pipe (16) from the oil discharge hole (25a), and even if the oil receiving plate (25) is provided, the oil (18) is not discharged. Does not occur.

(Invention of Claim 4)
The invention according to claim 4 has the following effect in addition to the effect of the invention according to claim 3.
<Effect> The oil diffusion suppressing function in the oil discharge guide chamber is high.
As illustrated in FIGS. 10A to 10C, in the present invention, oil (18) received by the top plate (25b) and scattered around the bottom of the top plate (25b) is an oil discharge gap ( 25d), it is received by the oil discharge guide surface (7b), flows down along the oil discharge guide surface (7b), and returns from the oil discharge gap (25d) to the lower side of the top plate (25b). The oil (18) diffusion suppressing function in the guide chamber (7) is high.

(Invention according to claim 5)
The invention according to claim 5 has the following effect in addition to the effect of the invention according to claim 4.
<Effect> The oil diffusion suppressing function in the oil discharge guide chamber is high.
As illustrated in FIGS. 10A to 10C, in the present invention, a part of the oil (18) received by the top plate (25b) and scattered around the bottom of the top plate (25b) is dripped. Since it is received by the plate (25e) and hardly diffuses to the high side of the oil discharge guide surface (7b), the function of suppressing the diffusion of the oil (18) in the oil discharge guide chamber (7) is high.

(Invention of Claim 6)
The invention according to claim 6 has the following effect in addition to the effect of the invention according to claim 4 or claim 5.
<Effect> The oil diffusion suppressing function in the oil discharge guide chamber is high.
As illustrated in FIGS. 10A to 10C, in the present invention, oil (18) received by the top plate (25b) and scattered around the bottom of the top plate (25b) is the top plate (25b). ), The oil (18) diffusion suppression function in the oil discharge guide chamber (7) is high.

<Effect> High oil diffusion control function.
As illustrated in FIGS. 10A to 10C, in the present invention, the oil (18) on the top plate (25b) is discharged from the oil discharge port (25j) below the top plate (25b), Since the blow-by gas (11) passing over the top plate (25b) is not easily scattered, the function of suppressing the diffusion of the oil (18) in the oil discharge guide chamber (7) is high.

(Invention of Claim 7)
The invention according to claim 7 has the following effects in addition to the effects of the invention described in any one of claims 1 to 6.
<Effect> Oil consumption can be reduced.
As illustrated in FIG. 2, in the present invention, the oil splashed by the rocker arm (3) on the blow-by gas outlet (6) side of the blow-by gas (11) along the bottom wall (4 a) of the breather chamber (4). Even if it gets on the flow, this flow is blocked by the peripheral wall (7a) of the oil discharge guide chamber (7), the amount of oil entering the blow-by gas inlet (5) is reduced, and the amount of oil entering the breather chamber (4) Is optimized, oil outflow to the outside of the cylinder head cover (2) is suppressed, and oil consumption can be reduced.

<Effect> It is possible to reduce engine noise emission from the cylinder head cover.
As illustrated in FIG. 2, in the present invention, the peripheral wall (7a) of the oil discharge guide chamber (7) protrudes downward from the bottom wall (4a) of the breather chamber (4). The rigidity of the bottom wall (4a) of 4) is increased, the bottom wall (4a) is less likely to vibrate, and the emission of engine noise from the cylinder head cover (2) through this vibration can be reduced.

FIG. 1A is an exploded perspective view of a cylinder head cover, an oil receiving rod, an oil receiving plate, and a bottom wall of a breather chamber according to an embodiment of the present invention, and FIG. It is B line sectional drawing. It is an upper section side view of an engine concerning an embodiment of the present invention. It is the III-III sectional view taken on the line of FIG. It is the IV-IV sectional view taken on the line of FIG. It is the VV sectional view taken on the line of FIG. It is the VI-VI sectional view taken on the line of FIG. It is the VII-VII sectional view taken on the line of FIG. FIGS. 8A and 8B are diagrams illustrating a separated oil guiding path used in an engine according to an embodiment of the present invention, FIG. 8A is a basic example, FIG. 8B is a first modified example, and FIG. 8C is a second modified example. It is. FIGS. 9A and 9B are diagrams for explaining a third modified example of the separated oil guiding path used in the engine according to the embodiment of the present invention, FIG. 9A is a diagram corresponding to FIG. 3, and FIG. It is a figure explaining the basic example of the oil discharge guide chamber used with the engine which concerns on embodiment of this invention, FIG. 10 (A) is a vertical front view, FIG.10 (B) is a B direction arrow line view of FIG.10 (A). FIG. 10C is a cross-sectional view taken along line CC of FIG. FIGS. 11A and 11B are diagrams illustrating a modified example of the oil discharge guide chamber used in the engine according to the embodiment of the present invention. FIG. 11A is a longitudinal front view of the first modified example, and FIG. FIG. 11C is a longitudinal front view of the third modification, and FIG. 11D is a view in the direction of arrow D in FIG. 11C. It is a figure explaining the modification of the oil discharge pipe used with the engine which concerns on embodiment of this invention, FIG. 12 (A) is a vertical front view of a modification, FIG.12 (B) is BB of FIG. 12 (A). It is line sectional drawing. FIGS. 13A and 13B are diagrams illustrating a texture used in an engine according to an embodiment of the present invention, FIG. 13A is a basic example, FIG. 13B is a first modified example, and FIG. 13C is a second modified example.

  FIGS. 1-13 is a figure explaining the engine which concerns on embodiment of this invention, and this embodiment demonstrates a vertical in-line two-cylinder diesel engine.

The outline of the engine of this embodiment is as follows.
As shown in FIG. 2, the cylinder head (1) is assembled to the upper part of the cylinder block (not shown), and the cylinder head cover (2) is assembled to the upper part of the cylinder head (1). The installation direction of the crankshaft (not shown) is the front-rear direction, and one of them is the front and the other is the rear.
An oil pan (not shown) is assembled to the lower part of the cylinder block (not shown).

  The cylinder head (1) is provided with a vortex chamber (not shown). A fuel injection pump (not shown) is connected to the vortex chamber (not shown) via a fuel injection pipe (not shown) and a fuel injection nozzle (not shown). Fuel is injected.

  As shown in FIG. 7, an intake and exhaust valve device (32) is accommodated in the cylinder head cover (2), and this valve device (32) is driven by the valve operating device (33). The valve operating device (33) includes a valve operating cam (not shown), a tappet (not shown), a push rod (33c), and a rocker arm (3). The push rod (33c) is accommodated in the push rod chamber (33d) shown in FIG. The blow-by gas (11) in the crankcase (not shown) enters the cylinder head cover (2) through the push rod chamber (33d).

As shown in FIG. 1, the bottom wall (4a) of the breather chamber (4) is assembled into the cylinder head cover (2) from the lower side, and the oil supply hole (2b) is formed in the ceiling wall (2a) of the cylinder head cover (2). The oil supply hole (2b) is closed by a detachable lid (2c).
The bottom wall (4a) of the breather chamber (4) is made of synthetic resin. The cylinder head cover (2) is made of aluminum die casting.

As shown in FIG. 6, this engine includes a cylinder head (1), a cylinder head cover (2) assembled to the top of the cylinder head (1), and a breather chamber (4) disposed in the cylinder head cover (2). ).
The breather chamber (4) is led downward from the oil discharge guide chamber (7), the blow-by gas passage chamber (8) disposed above the oil discharge guide chamber (7), and the oil discharge guide chamber (7). An oil discharge pipe (16) is provided.
The cylinder head (1) includes an oil reservoir (17), and a pipe outlet (16a) of the oil discharge pipe (16) is immersed in the oil (18) stored in the oil reservoir (17).
This engine has an advantage that the blow-by gas in the cylinder head cover (2) can be prevented from entering the breather chamber (4) from the oil discharge pipe (16) by the oil (18) in the oil reservoir (17). .

  As shown in FIG. 6, the breather chamber (4) is an oil suspended downward from the ceiling wall (8 a) of the blow-by gas passage chamber (8) toward the pipe inlet (16 c) of the oil discharge pipe (16). A receiving rod (24) is provided.

As shown in FIG. 6 , in this engine, even if the oil (18) in the oil sump (17) blows up from the oil discharge pipe (16) to the breather chamber (4), the oil (18) remains in the oil receiving rod (24). ) And is scattered around and hardly adheres to the ceiling wall (8a) of the blow-by gas passage chamber (8). For this reason, it is difficult for the blown-up oil (18) to travel along the ceiling wall (8a) to the blow-by gas outlet (6), and as a result, the oil (18) is blown by the breather chamber (4). Inconveniences that are taken out from the oil can be suppressed, and oil consumption can be reduced.

  The blow-by gas outlet (6) of the breather chamber (4) communicates with the intake passage (not shown), and when the negative pressure of the intake passage increases due to clogging of the air cleaner (not shown), the breather chamber (4) The internal pressure decreases, the pressure difference between the inside and outside of the breather chamber (4) increases, and the oil (18) of (17) tends to blow up from the oil discharge pipe (16) to the breather chamber (4).

As shown in FIG. 6, the ceiling wall of the blow-by gas passage chamber (8) (8a) is provided with a pivot frustum oil collection guide surface whose diameter decreases toward the upper end portion of (23a) (8b).

As shown in FIG. 6 , in this engine, the oil (18) adhering to the ceiling wall (8a) of the blow-by gas passage chamber (8) travels along the oil collecting guide surface (8b) by its own weight to the oil receiving rod (24 ) And travels along the oil receiving rod (24) and falls to the pipe inlet (16c) of the oil discharge pipe (16). For this reason, the oil (18) adhering to the ceiling wall (8a) of the blow-by gas passage chamber (8) is unlikely to be transmitted to the blow-by gas outlet (6) through the ceiling wall (8a), thereby reducing oil consumption. can do.

  As shown in FIG. 6, in this engine, the breather chamber (4) includes an oil receiving plate (25) that covers the pipe inlet (16c) of the discharge pipe (16) from above, and the oil receiving plate (25) A top plate (25b) having an oil discharge hole (25a) is provided, and an oil receiving rod (24) is inserted into the oil discharge hole (25a).

  As shown in FIG. 6, in this engine, the oil (18) blown up from the discharge pipe (16) and deflected obliquely upward by the oil receiving rod (24) is received by the oil receiving plate (25) and blow-by. The oil (18) does not reach the ceiling wall (8a) of the gas passage chamber (8), and the oil (18) does not easily reach the blow-by gas outlet (6) through the ceiling wall (8a), thereby reducing oil consumption. be able to.

  As shown in FIGS. 10A to 10C, in this engine, the oil discharge guide chamber (7) has an oil discharge guide surface (7b) that descends toward the pipe inlet (16c) of the oil discharge pipe (16). The top plate (25b) of the oil receiving plate (25) is provided with a peripheral portion (25c) closer to the higher position of the oil discharge guide surface (7b) than the oil discharge guide surface (7b). An oil discharge gap (25d) is formed between the peripheral edge (25c) closer to the high place.

  As shown in FIGS. 10 (A) to (C), in this engine, the oil (18) received by the top plate (25b) and scattered around the bottom of the top plate (25b) becomes the oil discharge gap (25d). The oil discharge guide surface (7b) is received and leaks down along the oil discharge guide surface (7b) and returns to the lower side of the top plate (25b) from the oil discharge gap (25d). The function of suppressing the diffusion of oil (18) in the chamber (7) is high.

  As shown in FIG. 6, in this engine, the oil discharge guide chamber (7) includes a side inner peripheral surface (7c) located beside the oil discharge guide surface (7b), and the top plate (25b) has a high height. A hanging plate (25e) suspended downward from the peripheral edge (25c) is provided, and a lower end edge (25f) of the hanging plate (25e) extends along the oil discharge guide surface (7b), and the hanging plate (25e) An oil discharge gap (25d) is provided between the side inner peripheral surfaces (7c).

  As shown in FIGS. 10 (A) to (C), in this engine, a part of the oil (18) that is received by the top plate (25b) and scattered around the bottom of the top plate (25b) Since it is received by (25e) and hardly diffuses to the high side of the oil discharge guide surface (7b), the function of suppressing the diffusion of oil (18) in the oil discharge guide chamber (7) is high.

As shown in FIGS. 10A and 10C, in this engine, the oil discharge guide chamber (7) includes a side inner peripheral surface (7c) located beside the oil discharge guide surface (7b), and an oil discharge guide. The lower side inner peripheral surface (7d) located on the lower side of the surface (7b), and the corner inner peripheral surface (7d) located at the boundary between the side inner peripheral surface (7c) and the lower side inner peripheral surface (7d) ( 7e).
The top plate (25b) is formed on the side peripheral edge (25g) along the side inner peripheral surface (7c) of the oil discharge guide chamber (7) and the lower side inner peripheral surface (7d) of the oil discharge guide chamber (7). A lower peripheral edge portion (25h) along which the cutout peripheral edge portion (25i) is located at the boundary between the side peripheral edge portion (25g) and the lower peripheral edge portion (25h).
An oil discharge port (25j) is opened between the corner inner peripheral surface (7e) and the notch peripheral portion (25i).

As shown in FIGS. 10 (A) to (C), in this engine, the oil (18) that is received by the top plate (25b) and scattered around the bottom of the top plate (25b) is the top plate (25b). Therefore, the oil (18) diffusion suppressing function in the oil discharge guide chamber (7) is high.
The oil (18) on the top plate (25b) is discharged from the oil discharge port (25j) below the top plate (25b) and is scattered by blow-by gas (11) passing over the top plate (25b). Since it is difficult, the function of suppressing the diffusion of the oil (18) in the oil discharge guide chamber (7) is high.

As shown in FIG. 2, in this engine, the breather chamber (4) has a blow-by gas inlet (5) on the front side and a blow-by gas outlet (6) on the rear side, with the longitudinal direction of the cylinder head cover (2) being the front-rear direction. Are provided with an oil discharge guide chamber (7) and a blow-by gas passage chamber (8) at an intermediate position in the front-rear direction. The blow-by gas inlet (5) may be disposed on the rear side, and the blow-by gas outlet (6) may be disposed on the front side.
2 and 4, the blow-by gas inlet (5) is opened to the bottom wall (4a) of the breather chamber (4), and the peripheral wall (7a) of the oil discharge guide chamber (7) is connected to the blow-by gas outlet ( 6) Projecting downward from the bottom wall (4a) of the breather chamber (4) toward the rocker arm (3) on the side and the blow-by gas inlet (5).

  As shown in FIG. 2, in this engine, the oil splashed by the rocker arm (3) on the blow-by gas outlet (6) side flows into the blow-by gas (11) along the bottom wall (4a) of the breather chamber (4). This flow is blocked by the peripheral wall (7a) of the oil discharge guide chamber (7), the amount of oil entering the blow-by gas inlet (5) is reduced, and the amount of oil entering the breather chamber (4) is reduced. As a result, the oil is prevented from flowing out of the cylinder head cover (2), and oil consumption can be reduced. Further, the rigidity of the bottom wall (4a) of the breather chamber (4) is increased, the bottom wall (4a) is less likely to vibrate, and engine noise emission from the cylinder head cover (2) through this vibration can be reduced. it can.

As shown in FIGS. 2 and 3, a reed valve (5a) is attached to the blow-by gas inlet (5). The opened reed valve (5a) is received by the stop plate (5b). In the inlet side oil separation chamber (9), the oil mist contained in the blowby gas (11) entering from the blowby gas inlet (5) collides with the reed valve (5a) to separate the oil, and the oil mist is separated from the chamber wall. Condensate and separate oil.
A baffle plate (45) protrudes downward from the bottom wall (4a) of the breather chamber (4) between the rocker arm (3) on the blow-by gas inlet (5) side and the blow-by gas inlet (5). Yes. For this reason, the flow of the blow-by gas (11) along the bottom wall (4a) of the breather chamber (4) is blocked by the baffle plate (45), and the amount of oil entering the blow-by gas inlet (5) is reduced. The baffle plate (45) is integrally formed with the bottom wall (4a) of the breather chamber (4).

As shown in FIGS. 2 and 3, the breather chamber (4) includes an inlet-side oil separation chamber (9) having a blow-by gas inlet (5) and a blow-by gas bypass passage (10). The blow-by gas (11) that has exited 9) is introduced into the blow-by gas passage chamber (8) and the oil discharge guide chamber (7) via the blow-by gas bypass passage (10).
Therefore, the blow-by gas (11) is continuously oil-separated in the inlet-side oil separation chamber (9) and the blow-by gas bypass passage (10), and the oil separation of the blow-by gas (11) is promoted.

The inlet side oil separation chamber (9) is formed long in the front-rear direction, and the blow-by gas bypass passage (10) is formed long in the lateral direction, and these are mutually connected at the rear opening (9a) of the inlet side oil separation chamber (9). In the blow-by gas bypass passage (10), oil mist contained in the blow-by gas (11) entering from the opening (9a) is condensed on the passage wall to perform oil separation.
The first partition wall (46) that partitions the inlet side oil separation chamber (9) and the blow-by gas bypass passage (10) is formed to be long in the lateral direction, and is integrally formed with the cylinder head cover (2) to form the ceiling wall (2a). It protrudes downward from.

  As shown in FIG. 3, the breather chamber (4) includes a partition wall (12) that partitions the blow-by gas bypass passage (10) and the blow-by gas passage chamber (8), and a separation oil guide path (13). The passage (13) has a start end (13a) disposed in the inlet side oil separation chamber (9), an intermediate portion (13b) disposed in the start end (10a) of the blow-by gas bypass passage (10), and a terminal end ( 13c) passes under the partition wall (12) and is led out to the oil discharge guide chamber (7).

As shown in FIG. 3, in this engine, the separated oil guiding path (13) can be formed short, and the separated oil (18) can be quickly guided to the oil discharge guide chamber (7).
Further, the end portion (13c) of the separation oil guide passage (13) that passes under the partition wall (12) is closed by the oil (18) separated in the oil separation chamber (9) on the inlet side, and the separation oil guide passage (13). The blow-by gas (11) does not enter the oil discharge guide chamber (7).
A second partition wall (12) that divides the blow-by gas bypass passage (10) and the oil discharge guide chamber (7) is formed to be long in the horizontal direction, and projects downward from the ceiling wall (2a) by being integrally formed with the cylinder head cover (2). It is installed.

As shown in FIG. 3, in this engine, the separated oil guide path (13) is constituted by a groove (14).
In this engine, the oil (18) separated at the inlet side oil separation chamber (9) and the start end (10a) of the blow-by gas bypass passage (10 ) enters the groove (14) from the upper opening of the groove (14). The oil (18) that quickly flows in, passes through the groove (14) with a small passage resistance, and can be quickly guided to the oil discharge guide chamber (7).
Also, if the separated-oil taxiway (13) is constituted by a groove (14), oil (18) through which passes separated oil guide passage (13), the blow-by gas bypass passage (10) blow Although there is a possibility of contact with the gas (11), as described above, the separated oil guide path (13) can be formed short, so that the separated oil (18) comes into contact with the blow-by gas (11). Difficult to re-mist. Further, even when the mist is re-misted, it is re-separated by the downstream blow-by gas bypass passage (10). For this reason, the separated oil (18) is hardly re-misted.

In the basic example shown in FIG. 8A, the groove (14) has a semicircular cross section.
The groove (14) is formed in a wedge shape in cross section, as in the first modification shown in FIG. 8 (B), and the inner bottom surface becomes gradually shallower toward the end portion (10b) side of the blow-by gas bypass passage (10). It may be.
The groove (14) is formed in a cross-sectional flask shape as in the second modification shown in FIG. 8 (C), the lower half (14a) is wider than the upper half (14b), and a wide passage is cut off. In the lower half (14a) of the area, the oil (18) is promptly guided, and in the upper half (14b) of the narrow opening area, the oil (18) and the blow-by gas (11) are difficult to come into contact with each other. 11) The oil (18) may not be easily re-misted.

The separation oil guiding path (13) may be configured by a pipe (15) as in the third modification shown in FIGS. 9 (A) and 9 (B).
In this case, the upper surface of the separated oil guiding path (13) is covered, and the oil (18) introduced into the separated oil guiding path (13) contacts the blowby gas (11) passing through the blowby gas bypass path (10). The separated oil (18) is not easily re-misted.
The pipe (15) can also be provided on the terminal end (10b) side of the blow-by gas bypass passage (10). The separation oil guiding path (13) of the pipe (15) disposed on the terminal end (10b) side of the blowby gas bypass passage (10) has the start end (13a) disposed in the inlet side oil separation chamber (9). The intermediate portion (13b) is disposed at the end portion (10b) of the blow-by gas bypass passage (10), and the end portion (13c) passes through the lower side of the partition wall (12) and is led out to the oil discharge guide chamber (7). ing.

As shown in FIG. 10 (A), the breather chamber (4) has an oil discharge pipe (16) at the lower part of the oil discharge guide chamber (7), and the oil discharge guide chamber (7) has an oil discharge guide surface on the inner periphery. (7b), and the oil discharge guide surface (7b) is inclined downward from the terminal end (13c) of the separated oil guide path (13) toward the pipe inlet (16c) of the oil discharge pipe (16).
For this reason, the separated oil (18) is smoothly discharged.
The reason is that a continuous oil film is formed by the oil (18) flowing down the slope on the downwardly inclined surface of the oil discharge guide surface (7b), and the subsequent oil (18) smoothly slides down the surface of the oil film. It is estimated to be.
In the basic example shown in FIG. 9A, the oil discharge guide surface (7b) is a flat inclined surface having no irregularities.
The oil discharge guide chamber (7) is long in the lateral direction, and the chamber wall of the oil discharge guide chamber (7) and the oil discharge pipe (16) are integrally formed with the bottom wall (4a) of the breather chamber (4). , Projecting downward from the bottom wall (4a).

The oil discharge guide surface (7b) extends from the terminal end (13c) of the separated oil guide path (13) to the pipe inlet (16c) of the oil discharge pipe (16) as in the first modification shown in FIG. It may be composed of a stair-like zigzag surface that goes down.
In this case, even if the engine is inclined toward the oil discharge guide surface (7b), the separated oil (18) is accumulated in the recess of the oil discharge guide surface (7b) formed by the zigzag surface, and the oil ( 18) hardly flows back through the oil discharge guide surface (7b).

The oil discharge guide surface (7b) is, as in the second modification shown in FIG. 11 (B), seen from the front side, the end portion (13a) of the separated oil guide path (13) from the oil discharge pipe (16). It may be composed of a curved surface of a cycloid curve having a tangent line descending toward the pipe inlet (16c).
In this case, the separated oil (18) is discharged smoothly.
The reason is that a continuous oil film is formed on the surface of the downward curved surface of the oil discharge guide surface (7b) by the oil (18) flowing down the downward curved surface, and the subsequent oil (18) is the shortest on the surface of the oil film. It is estimated that it slips down smoothly at a distance.

The oil discharge guide surface (7b) is connected to the pipe inlet of the oil discharge pipe (16) from the terminal end (13c) of the separated oil guide path (13) as in the third modification shown in FIGS. It may be a funnel-like curved surface with a constriction toward (16c).
In this case, there is an advantage that the separated oil (18) smoothly flows down the inclined oil discharge guide surface (7b) regardless of which direction the engine is inclined.

In the basic example shown in FIGS. 10 (A) and 10 (C), the oil discharge pipe (16) has a cylindrical peripheral surface shape with no irregularities.
The oil discharge pipe (16) is provided with a flow-down oil guide groove (16b) along the axial length direction on the inner circumferential surface of the cylindrical circumferential surface as in the first modification shown in FIGS. It may be. A plurality of flow-down oil guide grooves (16b) are formed at predetermined intervals in the circumferential direction.
In this case, the oil (18) flowing down the oil discharge pipe (16) is guided vertically downward by the flow-down oil guide groove (16b), and is smoothly discharged from the oil discharge pipe (16).

As shown in FIG. 3, a partition wall (39) divides the outlet side oil separation chamber (6a) having the blow-by gas outlet (6) and the oil discharge guide chamber (7). The communication ports (40) communicate with each other, and in the outlet-side oil separation chamber (6a), oil mist contained in the blow-by gas (11) is condensed on the chamber wall to perform oil separation of the blow-by gas (11).
The outlet side oil separation chamber (6a) is formed long in the lateral direction. A third partition wall (39) that divides between the outlet side oil separation chamber (6a) and the oil discharge guide chamber (7) is formed to be long in the lateral direction, and is connected to the bottom wall (4a) of the breather chamber (4). It is integrally molded and protrudes upward from the bottom wall (4a).

As shown in FIG. 2, the blow-by gas passage chamber (8) disposed above the oil discharge guide chamber (7) is partitioned from the blow-by gas bypass passage (10) by the second partition wall (12), and the second The blow-by gas bypass passage (10) communicates with a bypass passage outlet (10c) provided near the oil discharge pipe (16) of the partition wall (12).
As shown in FIG. 2, the blow-by gas passage chamber (8) is partitioned from the outlet side oil separation chamber (6a) by the third partition wall (39), and as shown in FIG. 39) is communicated with the outlet side oil separation chamber (6a) through a gap (39b) between the upper edge (39a) of the cylinder head cover (2) and the ceiling wall (2a) of the cylinder head cover (2). The vertical width of the gap (39b) is formed wider than the side closer to the side away from the blow-by gas outlet (6).
As shown in FIG. 2, the blow-by gas (11) flowing out from the bypass passage outlet (10c) passes through the blow-by gas passage chamber (8) and flows into the outlet-side oil separation chamber (6a).

The inner surface of the breather chamber (4), the upper surface of the bottom wall (4a) of the breather chamber (4), the inner circumferential surface of the groove (14), the inner circumferential surface of the pipe (15), the inner surface of the oil discharge guide chamber (7), The following surface treatment can be performed on all or part of the inner peripheral surface of the oil discharge guide surface (7b) and the oil discharge pipe (16).
An oil repellent layer such as a fluororesin is provided. In this case, the separated oil (18) quickly passes through the surface of the oil repellent layer, and the oil (18) is quickly discharged.
Performs embossing. In this case, the oil retention of the machined surface is enhanced, and a continuous oil film is formed by the oil (18) flowing through the machined surface. The subsequent oil (18) smoothly passes through the surface of the oil film, and the oil (18) It is discharged promptly.
In the basic example shown in FIG. 13 (A), the cross-hatching (38) uses a cross hatching groove. The embossed portion (38) includes a turtle shell groove as in the first modification shown in FIG. 13 (B), and a parallel groove along the inclination of the oil discharge guide surface (7b) as in the second modification shown in FIG. 13 (C). It may be.

(1) ... Cylinder head, (2) ... Cylinder head cover, (4) ... Breather chamber, (6) ... Blow-by gas outlet, (7) ... Oil discharge guide chamber, (7a) ... Perimeter wall, (7b) ... Oil discharge Guide surface, (7c) ... Wide inner peripheral surface, (7d) ... Lower side inner peripheral surface, (7e) ... Corner inner peripheral surface, (8) ... Blow-by gas passage chamber, (8a) ... Ceiling wall, 8b) ... oil collecting guide surface , (16) ... oil discharge pipe, (16a) ... pipe outlet, (16c) ... pipe inlet, (17) ... oil sump, (18) ... oil, (24) oil receiving rod, (25) ... Oil receiving plate, (25a) ... Oil discharge hole, (25b) ... Top plate, (25c) ... Periphery near the height, (25d) ... Oil discharge gap, (25e) ... Vertical plate, (25f ) ... lower end edge, (25g) ... side peripheral edge, (25h) ... low side peripheral edge, (25i) ... notch peripheral edge, (25j) ... oil discharge port.

Claims (7)

A cylinder head (1), a cylinder head cover (2) assembled on top of the cylinder head (1), and a breather chamber (4) disposed in the cylinder head cover (2);
The breather chamber (4) is led downward from the oil discharge guide chamber (7), the blow-by gas passage chamber (8) disposed above the oil discharge guide chamber (7), and the oil discharge guide chamber (7). Oil drain pipe (16)
In the engine, the cylinder head (1) includes an oil reservoir (17), and the pipe outlet (16a) of the oil discharge pipe (16) is immersed in the oil (18) accumulated in the oil reservoir (17).
The breather chamber (4) includes an oil receiving rod (24) suspended downward from the ceiling wall (8a) of the blow-by gas passage chamber (8) toward the pipe inlet (16c) of the oil discharge pipe (16). An engine characterized by that. The engine according to claim 1,
The ceiling wall (8a) of the blow-by gas passage chamber (8) is provided with a frustum oil collecting guide surface (8b) that is reduced in diameter toward the upper end of the oil receiving rod (24). engine. The engine according to claim 1 or 2,
The breather chamber (4) is provided with an oil receiving plate (25) covering the pipe inlet (16c) of the discharge pipe (16) from above, and the oil receiving plate (25) is a top plate provided with an oil discharge hole (25a). (25b), and an oil receiving rod (24) is inserted into the oil discharge hole (25a). The engine according to claim 3,
The oil discharge guide chamber (7) includes an oil discharge guide surface (7b) that descends toward the pipe inlet (16c) of the oil discharge pipe (16), and the top plate (25b) of the oil receiving plate (25) A high-position peripheral edge (25c) located near the height of the discharge guide surface (7b) is provided, and an oil discharge gap (25d) is provided between the oil discharge guide surface (7b) and the high-position peripheral edge (25c). An engine characterized by being formed. The engine according to claim 4, wherein
The oil discharge guide chamber (7) includes a side inner peripheral surface (7c) located beside the oil discharge guide surface (7b), and the top plate (25b) hangs downward from the peripheral edge (25c) closer to the high place. The bottom plate (25e) is provided with a bottom plate (25e), the lower edge (25f) of the bottom plate (25e) is along the oil discharge guide surface (7b), and oil is provided between the bottom plate (25e) and the side inner peripheral surface (7c). An engine having a discharge gap (25d). The engine according to claim 4 or 5,
The oil discharge guide chamber (7) includes a side inner peripheral surface (7c) located beside the oil discharge guide surface (7b) and a lower side inner peripheral surface located on the lower side of the oil discharge guide surface (7b). (7d) and a corner inner peripheral surface (7e) located at the boundary between the side inner peripheral surface (7c) and the lower side inner peripheral surface (7d),
The top plate (25b) is formed on the side peripheral edge (25g) along the side inner peripheral surface (7c) of the oil discharge guide chamber (7) and the lower side inner peripheral surface (7d) of the oil discharge guide chamber (7). A lower peripheral edge (25h) along the side, a side peripheral edge (25g) and a notch peripheral edge (25i) located at the boundary between the lower peripheral edge (25h),
An engine characterized in that an oil discharge port (25j) is opened between a corner inner peripheral surface (7e) and a notch peripheral portion (25i). The engine according to any one of claims 1 to 6, wherein
With the longitudinal direction of the cylinder head cover (2) as the front-rear direction, the breather chamber (4) has a blow-by gas inlet (5) at one end in the front-rear direction and a blow-by gas outlet (6) at the other end in the front-rear direction. with each oil discharge guide chamber (7) by gas passage chamber (8) in position, the cylinder head cover (2) covers the rocker arms (3),
The blow-by gas inlet (5) is opened to the bottom wall (4a) of the breather chamber (4), and the peripheral wall (7a) of the oil discharge guide chamber (7) is connected to the rocker arm (3) on the blow-by gas outlet (6) side. An engine characterized by projecting downward from the bottom wall (4a) of the breather chamber (4) toward the blow-by gas inlet (5).

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