JP3861560B2 - engine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an engine improvement.
[0002]
[Prior art]
In the conventional engine, blow-by gas is returned from the blow-by control valve 53 provided in the rocker cover 52 to the blow-by piping section 56a of the intake manifold 56 through the blow-by hose 54 and the connector 55, for example, as shown in FIG. As shown in FIG. 5, the blow-by piping portion 56a is equally distributed to the plurality of intake ports 57a of the cylinder head 57.
[0003]
When the intake manifold 56 is made of the aluminum alloy shown in FIG. 4, the blow-by piping portion 56a is formed integrally with the intake manifold main body 56b, and the inter-port flow path 56c along the arrangement direction of the intake ports 57a and between these ports. All of the communication paths (not shown) from the flow path 56c to the intake port 57a are formed by machining, and machining holes formed when forming both ends of the inter-port flow path 56c and the communication path are formed by driving the welch plugs 58 respectively. It is supposed to close.
[0004]
In addition, when the intake manifold is made of synthetic resin, the blow-by piping section having the inter-port flow path along the intake port arrangement direction and the communication path from the inter-port flow path to the intake port is separated from the intake manifold main body. Molded and welded to the intake manifold body or fixed with screws.
[0005]
[Problems to be solved by the invention]
However, in the above-described conventional engine 51, when the intake manifold 56 is made of an aluminum alloy, the inter-port passage 56c for returning the blowby gas to the plurality of intake ports 57a of the cylinder head 57 and the communication passage are formed. In addition to the need for machining, there is a problem that a large number of welch plugs 58 must be used to block both end portions of the inter-port flow path 56c and the processing holes for forming the communication path, while the intake manifold is synthesized. In the case of being made of resin, the blow-by piping portion must be formed separately from the intake manifold main body, and there is a problem that a step of fixing the blow-by piping portion to the intake manifold main body is necessary.
[0006]
Further, in both cases where the intake manifold 56 is made of aluminum alloy and made of synthetic resin, the rocker cover 52 and the intake manifold 56 are communicated with each other via the blow-by hose 54 and the connector 55. When emphasizing the layout and performance of the engine 1, it is necessary to strongly bend the rigid blow-by hose 54 at the time of insertion into the connector 55 for the convenience of setting the interval between the rocker cover 52 and the intake manifold 56 short. Contrary to this, when emphasizing improvement in workability, there is a problem that layout is restricted, and it is a conventional problem to solve these problems It was.
[0007]
OBJECT OF THE INVENTION
The present invention has been made paying attention to the above-described conventional problems, and it is possible to distribute the blow-by gas evenly to the plurality of intake ports of the cylinder head, as well as the number of parts and the number of work steps. The purpose is to provide an engine that requires less and can be easily assembled.
[0008]
[Means for Solving the Problems]
An engine according to claim 1 of the present invention includes a cylinder head, a rocker cover attached to the cylinder head, a blow-by control valve for controlling the amount of blow-by gas, and a gasket sandwiched between the cylinder head and the rocker cover. the blow-by gas passage for returning to evenly to a plurality of intake ports of the cylinder head blow-by gas through the blow-by control valve inside the rocker cover is provided, the blow-by gas flow path through the rocker cover and the gasket of the cylinder head The cylinder head side groove provided on the contact surface to be in contact with the rocker cover side groove located between the outer peripheral wall of the rocker cover and the partition wall facing the cylinder head side groove is provided. Multiple intake ports on the supply path and cylinder head Was provided with a dispensing channel communicating, it has a structure fitted with blow-by control valve in the partition wall of the rocker cover, and a means for solving the conventional problems described above the structure of such engines.
[0009]
An engine according to claim 2 of the present invention includes a cylinder head, a rocker cover attached to the cylinder head, a blow-by control valve for controlling the amount of blow-by gas, and a gasket sandwiched between the cylinder head and the rocker cover. , only set the blow-by gas passage for returning the blow-by gas inside the rocker cover evenly to a plurality of intake ports of the cylinder head through a blow-by control valve, the blow-by gas passage is open in the locker cover side provided on the gasket A feed passage formed by combining the gasket side groove and the rocker cover side groove located between the outer peripheral wall of the rocker cover and the partition wall facing the rocker cover, and a plurality of feed passages and cylinder heads. A distribution path communicating with the intake port is provided. Kaba partition wall construction and bookmarks fitted with blow-by control valve of which the construction of such an engine as a means for solving the conventional problems described above.
[0011]
The engine according to claim 3 of the present invention has a structure in which the distribution path forming wall provided in the cylinder head is made thick to function as a rib.
[0012]
[Effects of the Invention]
The engine according to claim 1 of the present invention, because has a structure described above, when the intake manifold is made of aluminum alloy, by an amount of not using the Welch plug with may omit most machining reduces the number of parts, On the other hand, if the intake manifold is made of synthetic resin, the process of molding the blow-by piping part or fixing it to the intake manifold body can be omitted, coupled with not using a blow-by hose or connector. In addition to reducing both the number of parts and the number of work processes, the assembly is facilitated . In particular, when the cylinder head and the rocker cover are cast, the cylinder head side groove portion and the rocker of the blow-by gas passage are used. Cover side grooves can be formed respectively, plus distribution If formed by a casting punching, so that the site of mechanical processing is reduced even more.
[0013]
Since the engine according to claim 2 of the present invention has the above-described configuration, as with the engine according to claim 1, when the intake manifold is made of an aluminum alloy, machining can be substantially omitted and the welch plug can be omitted. If the intake manifold is made of synthetic resin, the process of molding the blow-by piping part or fixing it to the intake manifold body can be omitted. Combined with the absence of a connector, the number of parts and the number of work processes are both reduced, and assembly is facilitated. In particular, the shape of the core used when casting the cylinder head Becomes simple.
[0014]
In the engine according to claim 3 of the present invention, since it has the above-described configuration, the increase in weight is suppressed by the amount that the rib is reduced, and in addition, the sectional area of the cylinder head is apparently increased. The rigidity will be increased.
[0015]
【The invention's effect】
The engine according to claim 1 of the present invention, because has a structure as described above, can be evenly distribute the blow-by gas in a plurality of intake ports of the cylinder head, not to mention aim to simplify the structure, parts It is possible to realize a significant reduction in the number of points and the number of work processes and ease of assembly, and in addition, by forming the distribution path of the blow-by gas flow path by casting, more parts to be machined can be obtained. leads to very good effect can be reduced further.
[0016]
The engine according to claim 2 of the present invention, since the configuration described above, in addition to the same effect as engine according to claim 1 of the present invention is obtained, the core shape to be used during the casting of the sheet cylinder head A very good effect is achieved that simplification can be realized.
[0017]
In the engine according to claim 3 of the present invention, since it has the above-described configuration, an extremely excellent effect that the rigidity can be increased while suppressing an increase in weight to a small extent is brought about.
[0018]
【Example】
Hereinafter, the present invention will be described with reference to the drawings.
[0019]
1 and 2 show an engine according to an embodiment of the present invention.
[0020]
As shown partially in FIG. 1, the engine 1 includes a cylinder head 2, a rocker cover 3 attached to the cylinder head 2, a blow-by control valve 4 for controlling the amount of blow-by gas, the cylinder head 2 and the rocker. A blow-by gas passage 10 having a gasket 5 sandwiched between the covers 3 and returning the blow-by gas to the plurality of intake ports 2a of the cylinder head 2 through the blow-by control valve 4 inside the rocker cover 3 is provided. I have.
[0021]
As shown in FIG. 2 (a), the blow-by gas flow path 10 includes a cylinder head side groove 2c provided at the time of casting on a joint surface 2b that comes into contact with the rocker cover 3 and the gasket 5 of the cylinder head 2. As shown in FIG. 2 (b), it has a feeding path 11 formed by combining the outer peripheral wall 3a of the rocker cover 3 and the rocker cover side groove portion 3c located between the opposing partition wall 3b. Further, a distribution path 12 is provided in the cylinder head 2 by casting to communicate the supply path 11 and the plurality of intake ports 2a, and the blow-by control valve 4 is attached to the partition wall 3b of the rocker cover 3. .
[0022]
In this case, the distribution path forming wall 2d located on the left and right sides in FIG. 2B of the distribution path 12 provided in the cylinder head 2 is made thick so that the distribution path forming wall 2d functions as a rib. is there.
[0023]
In the engine 1 of this embodiment, the blow-by gas passage 10 for returning the blow-by gas uniformly to the plurality of intake ports 2a of the cylinder head 2 is provided inside the rocker cover 3, so that the intake manifold is made of an aluminum alloy. When used, most of the machining can be omitted, and the number of parts is reduced by the amount that does not require the conventional Welch plug. On the other hand, if the intake manifold is made of synthetic resin, it is still used in the past. The process of molding the blow-by piping part that was done or fixing this to the intake manifold body can be omitted, and in addition, since no blow-by hose or connector is used at all, compared to conventional engines, Both the number of parts and the number of work processes are greatly reduced. , So that the assembly is done very simply.
[0024]
Further, in the engine 1, when the cylinder head 2 and the rocker cover 3 are cast, the cylinder head side groove 2c and the rocker cover side groove 3c can be formed, respectively, and the distribution path 12 is formed by casting. Thus, the number of parts to be processed can be further reduced.
[0025]
Further, in this engine 1, the distribution path forming wall 2d located on the left and right sides of the distribution path 12 formed in the cylinder head 2 in FIG. 2 (b) is made thick so as to function as a rib. The increase in weight is suppressed by the amount corresponding to the reduction of the original ribs. In addition, the rigidity is increased by the amount that the cross-sectional area of the cylinder head 2 is apparently increased.
[0026]
In the above-described embodiment, the cylinder head side groove portion 2c provided on the joining surface 2b contacting the rocker cover 3 of the cylinder head 2 via the gasket 5, the outer peripheral wall 3a of the rocker cover 3, and the partition wall 3b facing the cylinder head side groove portion 2b. The feeding channel 11 of the blow-by gas channel 10 is formed by combining the rocker cover side groove portion 3c that is positioned. However, the present invention is not limited to this, and for example, FIG. b), the gasket 15 is provided with a gasket-side groove 15c that opens on the rocker cover 3 side, and the gasket-side groove 15c of the gasket 15 and the rocker cover-side groove 3c of the rocker cover 3 are aligned. Thus, the supply path 11 of the blow-by gas flow path 10 may be formed.
[0027]
In this case, as shown in FIG. 3 (c), a communication hole 15a with the distribution path 12 is provided in the groove bottom portion of the gasket side groove 15c. Further, as shown in FIG. A bowl-shaped or ring-shaped built-up portion 15b is provided around 15a.
[0028]
In an engine employing this gasket 15, it is not necessary to provide the cylinder head side groove 2c on the joint surface 2b that comes into contact with the rocker cover 3 of the cylinder head 2 via the gasket 5, so that the core used when casting the cylinder head 2 is used. This simplifies the shape.
[0029]
The detailed configuration of the engine according to the present invention is not limited to the above-described embodiment.
[Brief description of the drawings]
FIG. 1 is a cross-sectional explanatory view (a) in a state where a cylinder head and a rocker cover are separated, showing an embodiment of an engine according to the present invention, and a cross-sectional explanatory view (b) in a joined state.
FIG. 2 is an explanatory plan view (a) and an explanatory side view (b) of the cylinder head shown in FIG. 1;
3 (a) is a plan view of a gasket employed in an engine according to another embodiment of the present invention, FIG. 3 (b) is a cross-sectional view at the position AA in FIG. 3 (a), and FIG. It is sectional explanatory drawing (c) in the BB line position in a), and sectional explanatory drawing (d) in the CC line position in FIG. 3 (a).
FIG. 4 is an overall perspective view showing a rocker cover and blow-by piping of a cylinder head in a conventional engine.
5 is a cross-sectional explanatory view in a state where a cylinder head and a rocker cover of the engine shown in FIG. 4 are separated.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Engine 2 Cylinder head 2a Cylinder head intake port 2b Joint surface 2c Cylinder head side groove part 2d Distribution path formation wall 3 Rocker cover 3a Rocker cover outer peripheral wall 3b Partition wall 3c Rocker cover side groove part 4 Blow-by control valve 5 Gasket 10 Blow-by gas flow Path 11 Supply path 12 Distribution path 15c Gasket side groove

Claims (3)

The cylinder head, a rocker cover mounted on the cylinder head, a blow-by control valve for controlling the amount of blow-by gas, and a gasket sandwiched between the cylinder head and the rocker cover are provided. the blow-by gas passage for returning to evenly to a plurality of intake ports of the cylinder head is provided via a valve, blow-by gas passage, the cylinder head side groove portion provided on the joint surface abutting via rocker cover and the gasket of the cylinder head And a feed passage formed by combining the outer peripheral wall of the rocker cover and the rocker cover side groove located between the opposing partition walls, and the feed passage and a plurality of intake ports of the cylinder head, With a distribution channel communicating with the locker Engine, characterized in that fitted with blow-by control valve to the bar of the partition wall. A cylinder head, a rocker cover mounted on the cylinder head, a blow-by control valve that controls the amount of blow-by gas, and a gasket that is sandwiched between the cylinder head and the rocker cover. only set the blow-by gas passage for returning equally to a plurality of intake ports of the cylinder head through the valve, blow-by gas passage, the gasket groove portion opening at the rocker cover side provided on the gasket, the outer peripheral wall of the rocker cover and It has a feeding path formed by combining the rocker cover side groove located between the opposing partition walls and a distribution path that communicates the feeding path and a plurality of intake ports of the cylinder head. , Blow-by control on the partition wall of the rocker cover Engine, characterized in that fitted with Rubarubu. The engine according to claim 1 or 2 , wherein a distribution path forming wall provided in the cylinder head is thick and functions as a rib .

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