JP5894023B2 - Turbocharged engine - Google Patents

Description

  The present invention relates to an engine with a supercharger, and more particularly, to an engine with a supercharger that can prevent a problem that a connection portion of a supercharged pipe is disconnected and can reduce the overall height of the engine.

Conventionally, as an engine with a supercharger, an exhaust manifold is arranged on one side of the cylinder head, a supercharger is arranged on the upper side of the exhaust manifold, and an intake manifold is arranged on the other side of the cylinder head. A cylinder head cover is attached to the top of the turbocharger, and the supercharger outlet of the turbocharger and the supercharged air inlet of the intake manifold are connected by a supercharged pipe that crosses the top of the cylinder head cover (for example, a patent Reference 1).
According to this type of engine with a supercharger, there is an advantage that supercharging is performed from the supercharger to the intake manifold to increase the output of the engine.

  However, in this prior art, the supercharged pipe is composed of a rubber pipe bent into an inverted U shape, the pipe inlet of the rubber pipe is the supercharged air outlet of the supercharger, and the pipe outlet is the supercharged air inlet of the intake manifold. There was a problem because each was inserted and connected with a belt clamp.

Japanese Patent Laying-Open No. 2005-273610 (see FIG. 3)

<Problem> The supercharged pipe is easily disconnected.
When supercharging pressure is applied to an inverted U-shaped rubber pipe, the rubber pipe deforms so that it swells upward, and the pipe inlet and pipe outlet attempt to escape from the supercharged air outlet and supercharged air inlet. The connecting part of the pipe is easy to come off.

<Problem> The overall height of the engine increases.
The rubber pipe needs to be largely separated from the ceiling wall of the cylinder head in order to avoid heat, and the overall height of the engine becomes high.

  The subject of this invention is providing the engine with a supercharger which can prevent the malfunction from which the connection location of a supercharged pipe remove | deviates, and can make the total height of an engine low.

Invention specific matters of the invention according to claim 1 are as follows.
As illustrated in FIG. 2, an exhaust manifold (2) is disposed on one side of the cylinder head (1), a supercharger (3) is disposed on the upper side of the exhaust manifold (2), and the cylinder head (1 The intake manifold (4) is arranged on the other side of the cylinder head, the cylinder head cover (5) is attached to the upper part of the cylinder head (1), the supercharged air outlet (3a) of the turbocharger (3) and the intake manifold ( In the engine with a supercharger in which the supercharged air inlet (4a) of 4) is communicated with a supercharged pipe (6) traversing the upper part of the cylinder head cover (5).
As illustrated in FIG. 2, the supercharger pipe (6) is composed of a metal pipe (7) and a rubber pipe (8), and the supercharger (3) is supercharged on one side of the cylinder head cover (5). One end part (7a) of the metal pipe (7) is connected and fixed to the air outlet part (3a) with a bolt (9) so that the metal pipe (7) crosses over the cylinder head cover (5). On the other side of (5), the supercharged air inlet part (4a) of the intake manifold (4) and the openings of the free end part (7b) of the metal pipe (7) are opposed to each other, and this supercharged air inlet part ( 4a) and the free end part (7b) of the metal pipe (7) are communicated with each other by a straight rubber pipe (8) fitted thereto ,
A breather chamber (10) is provided along the lower side of the ceiling wall (5a) of the cylinder head cover (5), and the ceiling wall portion (5b) recessed downward is projected toward the breather chamber (10), and the breather is The blow-by gas (11) passing through the chamber (10) collides with the ceiling wall portion (5b) protruding toward the breather chamber (10);
The lower part of the metal pipe (7) enters the recess (5c) of the ceiling wall part (5b),
As shown in FIG. 2, the longitudinal direction of the cylinder head cover (5) is the front-rear direction, and the ceiling where the blow-by gas (11) in the breather chamber (10) collides when the cylinder head cover (5) is viewed from the front or rear as shown in FIG. An engine with a supercharger, characterized in that a wall portion (5b) is curved in an upward convex arc shape, and a metal pipe (7) is curved in an upward convex arc shape along the ceiling wall portion (5b).

(Invention of Claim 1)
The invention according to claim 1 has the following effects.
<Effect> It is difficult to cause a problem that the connection portion of the supercharged pipe is disconnected.
As shown in FIG. 2, even if supercharging pressure is applied to the metal pipe (7), one end (7a) which is a fixed end of the metal pipe (7) connected and fixed by the bolt (9) is a supercharged air outlet. Even if the rubber pipe (8) is supercharged, the straight rubber pipe (8) simply swells in the radial direction, and both ends of the rubber pipe (8) are metal pipes ( The free end (7b) and the supercharged air inlet (4a) of 7) are not easily removed. Also, the metal pipe (7) having one end (7a) fixed with a bolt (9) and the other end free end (7b) supported by a rubber pipe (8) is a metal pipe having both ends supported by a rubber pipe. In comparison, vibration is less and vibrations of the free end (7b) of the metal pipe (7) fitted with the rubber pipe (8) and the supercharged air inlet (4a) are absorbed by elastic deformation of the rubber pipe (8). In addition, the free end portion (7b) and the supercharged air inlet portion (4a) of the metal pipe (7) are not damaged by vibration or easily pulled out from both ends of the rubber pipe (8). For this reason, the malfunction which the connection location of a supercharged pipe (6) removes does not occur easily.

<Effect> The overall height of the engine can be lowered.
As illustrated in FIG. 2, since the metal pipe (7) crosses over the cylinder head cover (5), the supercharged pipe (6) is greatly separated from the ceiling wall (5a) of the cylinder head cover (5). There is no need, and the overall height of the engine can be lowered.

<Effect> The overall height of the engine can be lowered.
As illustrated in FIGS. 1 and 2, the height of the supercharged pipe (6) is increased by the amount that the lower side of the metal pipe (7) has entered the recess of the ceiling wall part (5 b) of the cylinder head cover (5). The overall height of the engine can be lowered.

<Effect> The trouble that the free end of the supercharged pipe is detached from the rubber pipe due to vibration is less likely to occur.
As illustrated in FIG. 1, as illustrated in FIG. 2, the metal pipe (5) is inserted into the recess of the ceiling wall portion (5 b) of the cylinder head cover (5). 7) is shortened, the amplitude of the free end portion (7b) of the metal pipe (7) is small, and the problem that the free end portion (7b) of the metal pipe (7) is detached from the rubber pipe (8) due to vibration is less likely to occur.

<Effect> The oil separation performance of the breather chamber is enhanced.
As illustrated in FIG. 1, the blow-by gas (11) passing through the breather chamber (10) collides with the ceiling wall portion (5b) protruding toward the breather chamber (10). The oil mist contained in () adheres to and condenses on the ceiling wall portion (5b) where the oil mist collides, and the oil separation of the blow-by gas (11) is promoted, and the oil separation performance of the breather chamber (10) is enhanced.

It is a longitudinal cross-sectional view of the cylinder head cover of the engine with a supercharger which concerns on embodiment of this invention, and its peripheral part. It is the II-II sectional view taken on the line of FIG.

  1 to 2 are diagrams for explaining an engine with a supercharger according to an embodiment of the present invention. In this embodiment, an in-line multi-cylinder diesel engine with a supercharger will be described.

As shown in FIG. 2, an exhaust manifold (2) is disposed on one side of the cylinder head (1), a supercharger (3) is disposed on the upper side of the exhaust manifold (2), and the cylinder head (1). An intake manifold (4) is arranged on the other side of the cylinder, a cylinder head cover (5) is attached to the upper part of the cylinder head (1), a supercharged air outlet (3a) of the supercharger (3) and an intake manifold (4 ) Is connected to a supercharged air inlet (4a) by a supercharged pipe (6) traversing the cylinder head cover (5).

  As shown in FIG. 2, the supercharged pipe (6) is composed of a metal pipe (7) and a rubber pipe (8), and the supercharged air of the supercharger (3) is placed on one side of the cylinder head cover (5). One end portion (7a) of the metal pipe (7) is connected and fixed to the outlet portion (3a) with a bolt (9) so that the metal pipe (7) crosses over the cylinder head cover (5), and the cylinder head cover (5 ), The supercharged air inlet part (4a) of the intake manifold (4) and the openings of the free end part (7b) of the metal pipe (7) are opposed to each other, and the supercharged air inlet / outlet part (2a) And a free end portion (7b) of the metal pipe (7) are communicated with each other by a straight rubber pipe (8) fitted thereto. Both ends of the rubber pipe (8) are fastened to the supercharged air inlet (4a) and the free end (7b) of the metal pipe (7) by belt clamps (12) and (12).

As shown in FIG. 1 and FIG. 2, the ceiling wall portion (5b) of the cylinder head cover (5) is recessed downward, and the lower side of the metal pipe (7) is inserted into the recess (5c) of the ceiling wall portion (5b). The part is entered.
As shown in FIG. 2, when the longitudinal direction of the cylinder head cover (5) is the front-rear direction, the ceiling wall where the blow-by gas (11) in the breather chamber (10) collides when the cylinder head cover (5) is viewed from the front or the rear. The portion (5b) is curved in an upward convex arc shape, and the metal pipe (7) is curved in an upward convex arc shape along the ceiling wall portion (5b).

  As shown in FIG. 1, a breather chamber (10) is provided along the lower side of the ceiling wall (5a) of the cylinder head cover (5), and the ceiling wall portion (5b) recessed downward is formed in the breather chamber (10). The blow-by gas (11) passing through the breather chamber (10) collides with the ceiling wall portion (5b) protruding toward the breather chamber (10).

As shown in FIGS. 1 and 2, the breather chamber (10) has a ceiling wall (5), left and right side walls (13), (13), a bottom wall (14), and front and rear end walls (5) suspended from the ceiling wall (5). 15) and 15), the blow-by gas inlet (16) is provided at the end of the bottom wall (14) on one end side, and the blow-by gas outlet (17) is provided on the end of the ceiling wall on the other end side. And a ceiling wall portion (5b) protruding toward the breather chamber (10) is provided in the middle of the breather chamber (10).
As shown in FIG. 1, in the middle of the breather chamber (10), the oil mist contained in the blow-by gas (11) colliding with the ceiling wall portion (5b) is condensed on the surface of the ceiling wall portion (5b), and condensed oil (18) falls on the bottom plate (14) and is returned to the cylinder head (1) from the blow-by gas inlet (16).

As shown in FIG. 1, a diaphragm type breather valve (21) urged toward the valve closing side is disposed at the blow-by gas outlet (17), and the internal pressure of the engine is controlled by the pressure adjusting function of the breather valve (21). While the pressure is adjusted, the oil of the blow-by gas (11) is separated by the throttle resistance of the breather valve (21).
As shown in FIG. 2, a rocker arm (19) interlocking with the intake / exhaust valve (18) is arranged on the upper part of the cylinder head (1) below the breather chamber (10). A vortex chamber (20) is formed in the cylinder head (1) on the intake manifold (4) side.

(1) Cylinder head
(2) Exhaust manifold
(3) Turbocharger
(3a) Supercharged air outlet
(4) Intake manifold
(4a) Supercharged air inlet
(5) Cylinder head cover
(5a) Ceiling wall
(5b) Ceiling wall part
(5c) Dimple
(6) Supercharged pipe
(7) Metal pipe
(7a) One end
(7b) Free end
(8) Rubber pipe
(9) Bolt
(10) Breezer room
(11) Blowby gas

Claims (1)

An exhaust manifold (2) is disposed on one side of the cylinder head (1), a supercharger (3) is disposed on the upper side of the exhaust manifold (2), and an intake manifold is disposed on the other side of the cylinder head (1). (4) is arranged, the cylinder head cover (5) is attached to the upper part of the cylinder head (1), the supercharged air outlet (3a) of the supercharger (3) and the supercharged air inlet of the intake manifold (4) In the engine with a supercharger, in which (4a) is communicated with a supercharged pipe (6) crossing the cylinder head cover (5) above,
The supercharging pipe (6) is composed of a metal pipe (7) and a rubber pipe (8), and on the side of the cylinder head cover (5) on the supercharging air outlet (3a) of the supercharger (3), One end (7a) of the metal pipe (7) is connected and fixed with a bolt (9) so that the metal pipe (7) crosses over the cylinder head cover (5), and on the other side of the cylinder head cover (5). The supercharged air inlet (4a) of the intake manifold (4) and the openings of the free end (7b) of the metal pipe (7) are opposed to each other, and the supercharged air inlet (4a) and the metal pipe (7) The free end portion (7b) is communicated with a straight rubber pipe (8) fitted thereto ,
A breather chamber (10) is provided along the lower side of the ceiling wall (5a) of the cylinder head cover (5), and the ceiling wall portion (5b) recessed downward is projected toward the breather chamber (10), and the breather is The blow-by gas (11) passing through the chamber (10) collides with the ceiling wall portion (5b) protruding toward the breather chamber (10) ;
The lower part of the metal pipe (7) enters the recess (5c) of the ceiling wall part (5b) ,
With the longitudinal direction of the cylinder head cover (5) as the longitudinal direction, the ceiling wall portion (5b) where the blow-by gas (11) of the breather chamber (10) collides is projected upward when the cylinder head cover (5) is viewed from the front or the rear. An engine with a supercharger, wherein the engine is curved in an arc shape, and the metal pipe (7) is curved in an upward convex arc shape along the ceiling wall portion (5b).

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