JP2531146Y2 - Cylinder head cover structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a cylinder head cover.

[0002]

2. Description of the Related Art As shown in Japanese Utility Model Laid-Open Publication No. 62-24042, a cylinder head cover for covering a cylinder head is usually provided with bolts for inserting mounting bolts for mounting the cylinder head cover to the cylinder head. A boss portion and a plug hole wall through which the ignition plug is inserted are provided.

Further, since the cylinder head cover is cast by a mold, the cylinder head cover is also provided with a pin projection for pressing with an eject pin when the cylinder head cover is released from the mold after casting.

[0004] Conventionally, the above-mentioned bolt boss portion and plug hole are provided separately and independently.

[0005]

However, when the boss portion for the bolt is provided near the peripheral wall portion of the cylinder head cover, the boss portion for the bolt is connected to the peripheral wall portion of the cylinder head cover or at the lower end of the peripheral wall portion. The rigidity of the bolt boss can be ensured by providing the flange boss. However, when the bolt boss is provided at the center of the cylinder head cover, the bolt boss is connected to the peripheral wall of the cylinder head cover. I can't.
For this reason, there is a problem that the rigidity of the bolt boss located at the center of the cylinder head cover is not sufficient.

In view of the above, it is an object of the present invention to improve the rigidity of a bolt boss located at the center of a cylinder head cover.

[0007]

In order to achieve the above object, the present invention is to connect a bolt boss and a plug hole wall with a rib via an eject pin projection.

Specifically, a solution taken by the present invention is to provide a cylinder having a boss portion for a bolt for inserting an assembly bolt for assembling a cylinder head cover to a cylinder head and a plug hole wall for inserting a spark plug. A head cover structure, wherein a pin projection for pressing with an eject pin when the cylinder head cover is released from a mold is provided between the bolt boss portion and the plug hole wall; Ribs connecting the bolt boss and the plug hole wall via the pin protrusion between the pin boss and the pin protrusion and between the pin protrusion and the plug hole wall, respectively. The configuration is provided.

[0009]

According to the above construction, the bolt boss and the plug hole wall are connected via the pin projection and the rib provided between them, so that the bolt boss, the plug hole wall and the space between them are provided. The rigidity of the cylinder head cover body is improved.

[Correction 2]

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an upper bottom portion 10 according to an embodiment of the present invention.
2 shows a cross-sectional structure of the cylinder head cover A, and FIGS. 1 and 2 show 12A, 12B, 12C and 12D.
Is a plug hole wall which is provided sequentially in the cylinder row direction and through which a spark plug is inserted.

In FIG. 1, reference numerals 14A, 14B, and 14C denote bolt bosses through which assembling bolts for attaching the cylinder head cover A to a cylinder head (not shown) are inserted. As shown in FIG. A boss portion 14A for the peripheral edge bolt located at the peripheral edge portion of the cylinder head cover A has a flange portion at the lower end of the peripheral wall 16 of the cylinder head cover A.
The partition wall bolt boss 14 </ b> B provided on the partition wall 6 a and located near the partition wall 18 is provided so as to be connected to the partition wall 18. On the other hand, the center bolt boss 14C located at the center of the cylinder head cover A is provided independently of the peripheral wall 16 of the cylinder head cover A.

In FIG. 1, reference numerals 20, 20,... Denote pin projections for pressing with an eject pin when the cylinder head cover A is released from the mold. 16, when the partition wall 18 or the plug hole walls 12A to 12D are provided, they are provided in connection with those walls.

In the cylinder head cover A having the above-described structure, as a feature of this embodiment, as shown in detail in FIGS. 3 and 4, between the second plug hole wall 12B and the center bolt boss 14C. Is provided with a first pin projection 20A in the vicinity of the boss, and connects the first projection 20A in the vicinity of the boss with the second plug hole wall 12B and the boss 14C for the central bolt. Rib 2
2, 22 are provided, and the boss 1 for the central bolt is provided.
Between the 4C and the third plug hole wall 12C, a projection 20B for the second pin near the boss, a projection 20B for the second pin near the boss, the third plug hole wall 12C, and the center bolt Ribs 22, which respectively connect the bosses 14C,
22 are provided.

As a result, the second plug hole wall 1
The second plug hole wall 12C and the center bolt boss 14C are connected to the center pin boss 14C for the second pin near the boss by the ribs 22 and 22 via the first projection 20A near the boss. The ribs 22 and 2 are provided via the protrusions 20B
2 are connected to each other.

[0016]

As described above, according to the cylinder head structure of the present invention, the pin projection is provided between the bolt boss and the plug hole wall, and the bolt boss and the pin projection are provided. Are provided between the bolt boss portion and the plug hole wall through the pin protrusion portion, and between the pin boss portion and the plug hole wall. It is connected to the wall via the pin projection and the rib, and the rigidity of the boss for the bolt, the plug hole wall, and the cylinder head cover body between them is improved.

[Brief description of the drawings]

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

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a partially enlarged bottom view of the cylinder head cover.

FIG. 4 is a sectional view taken along line IV-IV in FIG. 3;

[Explanation of symbols]

 A: Cylinder head cover 12A, 12B, 12C, 12D: Plug hole wall 14C: Boss portion for central bolt (Boss portion for bolt) 20A: First protrusion near boss portion (Protrusion portion for pin) 20B: Near boss portion 2-pin projection (pin projection) 22 ... rib

Continued on the front page (72) Inventor Noboru Kato 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Inside Mazda Co., Ltd. (56) References Bikai 2-78750 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A cylinder head cover having a bolt boss for inserting an assembling bolt for assembling the cylinder head cover to the cylinder head and a plug hole wall for inserting a spark plug. A pin projection for pressing with an eject pin when the cylinder head cover is released from the mold is provided between the boss and the plug hole wall. A cylinder provided with ribs for connecting the bolt boss and the plug hole wall via the pin projection between the pin projections and the plug hole wall, respectively. Head cover structure.