JP3163159B2 - Engine cylinder head cover - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder head cover for an engine, and more particularly to a DLI (Distributor L).
DOH adopting ESS Ignition) system
The present invention relates to a cylinder head cover of a C engine.

[0002]

2. Description of the Related Art In recent years, in engines for automobiles and the like, as disclosed in, for example, Japanese Utility Model Laid-Open Publication No. 61-167417, an ignition coil is directly attached to an ignition plug of each cylinder as an ignition system. By controlling the ignition of the plug, a DLI system that does not require a distributor is being adopted.

In this case, the same number of ignition coils as the number of cylinders are arranged above the cylinder head.
In the engine disclosed in the above publication, in a DOHC engine, ignition coils are arranged in a line between rocker covers that respectively cover two camshafts, and individually fixed to a cylinder head, and above the ignition coils. Is covered by an upper cover provided between the rocker covers.

[0004]

By the way, when the DLI system is employed in the DOHC engine as described above, in the configuration disclosed in the above publication, two camshafts and the same number of cylinders are provided on the upper part of the cylinder head. Is attached, the structure of the upper part of the head becomes complicated, and two rocker covers respectively covering two cam shafts as a cylinder head cover for covering the upper part of the cylinder head; , An upper cover is required, thereby increasing the number of parts.

On the other hand, it is conceivable that a single cylinder head cover covering two camshafts is provided with the same number of ignition coils as the number of cylinders. However, in this case, the following problem occurs.

That is, while the ignition coil is connected to a spark plug attached to the cylinder head, an electric cord led from the outside of the engine is connected to the ignition coil. It is necessary to provide the same number of cylinders as the number of cylinders, so that the rigidity of the cylinder head cover decreases. Since the ignition coil is attached to the cover having reduced rigidity, sufficient support rigidity for the coil cannot be obtained, and the support becomes unstable. In addition, due to insufficient rigidity, the cylinder head cover is deformed by the weight of the coil. Therefore, the peripheral portion of the cover is particularly lifted at a portion near the support portion of the coil on the surface of the cover where the cylinder head is mated with the cylinder head. In this case, the sealing property is deteriorated.

[0007] Such a problem is particularly remarkable when the cylinder head cover is made of a synthetic resin to reduce the weight.

Accordingly, an object of the present invention is to prevent the above-mentioned problems by effectively increasing the rigidity of the cover when a coil for an ignition plug is attached to the cylinder head cover.

[0009]

Means for Solving the Problems In order to solve the above problems, the present invention is characterized in that it is configured as follows.

That is, the invention according to claim 1 of the present application (hereinafter, referred to as the invention)
In the first invention, the ignition plug of each cylinder is
A cylinder head cover attached to an upper portion of a cylinder head of a DOHC engine to which a fire coil is directly attached, a pair of projections provided in parallel on both sides and respectively covering two camshafts, in those with a recess extending in the camshaft direction between the insertion opening of the coil the spark plug causes respectively opened at each cylinder corresponding position in the recessed portion, the pair of convex portions at a position between the insertion opening Cover side walls on the concave side
Ribs are formed on the upper surface side , and mounting bosses are provided on these ribs so that the coils are arranged in a line in the cam axis direction.

According to a second aspect of the present invention (hereinafter, referred to as a second aspect of the invention), a pair of convex portions provided on both sides in parallel with each other is provided between the convex portions. and a recessed portion extending in the camshaft direction, the spark plug Niso of each cylinder
In the cylinder head cover directly attached was DOHC type engine respectively ignition coil, the insertion opening of the coil the spark plug at each cylinder corresponding position in the recess causes each opened, the pair at a position between the insertion opening Cover the side walls of the concave part side of the convex part
Forming ribs to be connected on the surface side . The ribs are provided with mounting bosses so that the coils are arranged in a line in the cam axis direction, and a cylinder is provided around the cover on an extension of the ribs in a direction perpendicular to the cam axis direction. It is characterized in that an insertion hole for a fastening bolt to the head is provided.

[0012]

According to the above construction, in either of the first and second aspects of the invention, a pair of parallelly extending projections on both sides are connected by a rib at a position between the respective insertion openings of the ignition plug coil. As a result, the rigidity of the cylinder head cover in the width direction is increased. Further, since the ignition coils of the respective cylinders are attached to the boss provided on the rib so as to be arranged in a line in the cam axis direction, the cylinder is constituted by the rib, the boss and the coil at the center in the width direction of the cylinder head cover. Thus, a series of high-rigidity portions extending in the cam axis direction are formed. Therefore, the cylinder head cover has a high-rigidity portion in a lattice shape by the high-rigidity portion, the high-rigidity convex portions on both sides thereof, and the respective ribs extending in a direction perpendicular to these high-rigidity portions. The overall rigidity is effectively improved.

According to the above construction, the coil is attached to the boss provided on the rib connecting the pair of projections, so that the weight of the coil acts on the rib. According to the above, the cover is fastened to the cylinder head at the peripheral portion of the cover on the extension line in the direction orthogonal to the cam axis direction of the rib, so that the weight of the coil is reduced by the cover on the extension line via the rib. Even if it affects the peripheral part, the problem that the part rises from the mating surface of the cylinder head does not occur.

[0014]

Embodiments of the present invention will be described below.

As shown in FIGS. 1 and 2, a cylinder head cover 10 according to this embodiment is provided in parallel on both sides and has a pair of convex portions 11 for accommodating two camshafts 1 and 1, respectively. 11, a concave portion 12 extending in the direction of the cam shaft between these convex portions 11, 11, and a pair of gears provided at one end of the cover 10 and attached to the ends of the cam shafts 1, 1. 2 and 2 are accommodated, and a number of bolt insertion holes 14 for tightening to a cylinder head (not shown) are provided around the cover 10.
.. 14 are provided.

A rib 15 for connecting a pair of projections 11, 11 located on both sides is provided at a portion of the concave portion 12 corresponding to between the cylinders and at an end opposite to the gear storage portion 13. .. 15 are provided, and both convex portions 11,
Numeral 11 is connected by a connecting portion 16 at the end on the side of the gear accommodating portion 13, so that the inside of the concave portion 12 is substantially equal to the number of cylinders (four in the illustrated example) 17. It is in a partitioned state.

As shown in FIG. 2 and FIG. 3, at the center of the bottom of each of the spaces 17,.
18 are provided, and in these openings 18.
Spark plugs 3... 3 arranged substantially at the center of the combustion chamber of each cylinder
Are connected to the ignition coils 4... Also, the ribs 15... 15 and the connecting portion 16 are arranged in a line along the center line of the cover 10 so as to be located on both sides of the respective openings 18. As shown in FIG.
The ignition coils 4... 4 are attached to these bosses 19.

Here, in this embodiment, the ribs 15.
15, three ribs 15 provided at a portion between cylinders
15a are connected to only one of the pair of convex portions 11, 11 and are not connected to the other. The tips of the ribs 15a... 15a and the ribs 15a.
Bosses 20... 20 each having a bolt insertion hole 14 ′ for fastening the cover 10 to the cylinder head are provided between the convex portion 11 to which the cover 10 is not connected. Therefore, as shown in FIG. 4, the ribs 15a... 15a and the bosses 20... 20 connect the protrusions 11 on both sides, so that the ribs 15a. A rib having a high rigidity for connecting the convex portions 11 on both sides is formed.

Then, as shown in FIG.
15a and the bosses 20... 20 in the peripheral portion of the cover 10 on a substantially extended line XX of the high-rigidity portion in the direction orthogonal to the cam axis direction. The insertion holes 14a... 14a are arranged.

According to the above configuration, the pair of projections 11, 1
The number of openings 18 for inserting the same number of ignition coils as the number of cylinders is formed in the recess 12 extending in the cam axis direction between the cylinder heads 1, so that the cylinder head cover 10 is particularly rigid at the recess 12. However, the pair of projections 11, 11 are formed by the connecting portion 16 at the end on the gear housing portion 13 side, by the rib 15 on the opposite end, and between the cylinders. In the position, the ribs 15a and the bosses 20 are connected to each other.
A plurality of high-rigidity portions in a direction orthogonal to the cam axis direction are formed between the convex portions 11 on both sides.

The connecting portion 16 and the ribs 15... 15
18 are provided at the bottom of the recess 12.
Bosses 19... 19 are provided on both sides of the cover 10 so as to be aligned in a line along the center line of the cover 10, and the ignition coil 4 of each cylinder is connected to connect these bosses 19. . 4 are attached to each other, so that the bosses 19... 19 and the coils 4.

Therefore, the cylinder head cover 1
0, one high-rigidity portion extending in the cam axis direction at the center portion, and a pair of high-rigidity convex portions 1 extending parallel to both sides thereof.
1, 11 and a plurality of high-rigidity portions which are orthogonal to these and connect the convex portions 11, 11 on both sides are formed. The rigidity of the cover 10 as a whole is made effective by forming them in a lattice shape. It will be raised to.

As a result, the support rigidity of the coils 4... 4 attached to the cover 10 is improved, the attachment state is stabilized, and the peripheral portion of the cover 10 at the mating surface with the cylinder head is formed. That is, the sealing property is ensured.

In particular, according to the above configuration, the rib 15a connecting the pair of projections 11 and 11 and the boss 20
A hole 14 for inserting a bolt for fastening to a cylinder head is provided on a substantially extended line of the high rigid portion of
14a, the cover 10 is fastened to the cylinder head at this portion even if the weight of the coils 4... 4 acts on the mating surface on the extension line via the high rigidity portion. Accordingly, the mating surface of the cover 10 does not rise from the cylinder head side, thereby further improving the sealing performance at the mating surface with the cylinder head.

[0025]

As described above, according to the present invention, the DOHC to which the same number of spark plug coils as the number of cylinders are attached is provided.
In the cylinder head cover of the type engine, a pair of protrusions extending in parallel to both sides are connected by a rib, and the coil and the coil are formed along a concave portion in which an insertion opening of the coil is opened between the two protrusions. By forming a series of high rigidity portions with the mounting boss, the entire cover is reinforced in a lattice shape . As a result, the rigidity of support for the ignition coil is increased, the mounting state is stabilized, and the deformation of the cover is prevented. Even when the cover is made of a synthetic resin, the mating surface with the cylinder head is particularly improved. In this case, good sealing performance is ensured.

[Brief description of the drawings]

FIG. 1 is a plan view of a cylinder head cover according to an embodiment of the present invention.

FIG. 2 is a vertical sectional front view of the cylinder head cover taken along line AA of FIG. 1;

FIG. 3 is a vertical sectional side view of the cylinder head cover taken along line BB in FIG. 1;

FIG. 4 is a vertical sectional side view of the cylinder head cover taken along line CC of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Camshaft 3 Spark plug 4 Coil 10 Cylinder head cover 11 Convex part 12 Depressed part 14 Boss for tightening cover 15 Rib 18 Coil insertion opening (opening) 19 Boss for coil installation

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-U 2-78750 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F02F 1/00-7/00 F02P 15 / 00 303

Claims (2)

(57) [Claims] An ignition plug is connected to an ignition plug of each cylinder.
A cylinder head cover attached to the upper part of the cylinder head of the DOHC engine to which the oil is directly attached, and a pair of projections provided in parallel on both sides to respectively cover two cam shafts, and between these projections and a recess extending in the camshaft direction, with the insertion opening of the coil the spark plug is opened to each cylinder corresponding position in the recessed portion, the pair of convex portions at a position between the insertion opening
Ribs connecting the side walls on the upper surface side of the cover to each other on the upper surface side of the cover, and mounting ribs are provided on these ribs so that the coils are aligned in the cam axis direction. A cylinder head cover for an engine. 2. A spark plug for each cylinder is provided with an ignition plug.
A cylinder head cover attached to the upper part of the cylinder head of the DOHC engine to which the oil is directly attached, and a pair of projections provided in parallel on both sides to respectively cover two cam shafts, and between these projections and a recess extending in the camshaft direction, with the insertion opening of the coil the spark plug is opened to each cylinder corresponding position in the recessed portion, the pair of convex portions at a position between the insertion opening
Ribs are formed to connect the side walls on the upper surface side of the cover to each other on the upper surface side of the cover, and mounting ribs are provided on these ribs so that the coils are arranged in a line in the cam axis direction. A cylinder head cover for an engine, wherein an insertion hole for a tightening bolt to a cylinder head is provided in a peripheral portion of the cover on an extension of the rib in a direction perpendicular to the cam axis direction.