JPS6327193Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a cylinder head cover for an engine, and in particular, to a double-structured one with a sealed space for sound insulation between two upper and lower cover members. The present invention relates to an improvement in a support structure for fixedly supporting a predetermined edge portion of an upper cover member to a lower cover member.

(Prior Art) In general, direct injection diesel engines have excellent advantages of low fuel consumption and high output, but on the other hand, they have the disadvantage of high engine noise.

Therefore, in order to reduce such engine noise, a cylinder head cover that is attached to the top surface of the cylinder head of the engine has been conventionally disclosed, for example, in Japanese Utility Model Publication No. 7753/1983.
By creating a double structure consisting of a lower head cover that directly covers the cylinder head, and an upper head cover that is attached to the lower head cover via an elastic material so as to cover its upper surface while maintaining a predetermined sealed space, A cylinder head cover structure has been proposed in which engine noise is insulated by the double-layered cylinder head cover to prevent it from leaking to the outside.

(Problem to be solved by the invention) By the way, in this proposal, an oil injection hole for injecting oil into the engine is formed by a pair of through holes that open correspondingly to the upper and lower head covers. In this case, a structure is adopted in which the peripheral edge of the through hole of the upper head cover is fixedly supported by being pressed against the peripheral edge of the through hole of the lower head cover via a sealing material made of an elastic material. ing.

However, in this conventional fixing structure, only the peripheral edge of the through hole of the upper head cover is pressed against the lower head cover via a sealing material, so when the entire cylinder head cover is bolted to the cylinder head, each When the span between the bolts is long, there is a problem in that the peripheral edge of the through hole of the upper head cover cannot be securely fixed to the lower head cover.

The present invention has been devised in view of this point, and the periphery of the through hole for the oil injection hole in the upper head cover is pressed and held against the lower head cover using an existing filler cap that closes the oil injection hole. By doing so, the peripheral edge of the through hole, which is a part of the edge of the upper head cover, can be firmly fixed to the lower head cover with a simple structure while suppressing vibration transmission to the upper head cover. The purpose is to

(Means for Solving the Problem) To achieve this object, the cylinder head cover of the present invention includes a head cover member that covers the cylinder head of an engine, and a head cover member that covers the upper surface of the head cover member while maintaining a predetermined sealed space. It is provided in a double structure consisting of a sound insulating cover member attached via an elastic material.

The head cover member is formed with an oil injection hole which is closed by a filler cap and has a collar portion whose peripheral edge protrudes above the upper surface of the head cover member. On the other hand, a through hole larger than the outer diameter of the collar portion is formed in the sound insulating cover member in correspondence with the protruding collar portion. Further, in a state where the filler cap closes the oil injection hole, an oil seal member is interposed at the abutting portion between the filler cap and the collar portion, and an elastic material is provided in the filler cap to cover the peripheral edge of the through hole. A pressing portion that presses and holds the member is formed on the upper surface of the member.

(Function) With the above configuration, in the present invention, the cylinder head cover has a double structure consisting of the head cover member and the sound insulating cover member with a sealed space interposed therebetween, so that the noise generated in the valve train of the cylinder head is reduced. Leakage to the outside of the engine can be suppressed by the sealed space between the cover members, thereby reducing engine noise.

Furthermore, when the oil injection hole of the head cover member is closed by the filler cap, the peripheral edge of the through hole of the sound insulating cover member is pressed against the upper surface of the head cover member via the elastic material by the pressing portion of the filler cap. To securely and firmly fix the peripheral edge of the through hole to the head cover member as the oil injection hole is closed, and to fix the edge of the sound insulating cover member with a simple structure using an existing filler cap. This is possible.

Further, when the oil injection hole is closed by the filler cap, the space between the filler cap and the collar portion is sealed by the oil seal member. In other words, since the fixed support of the through-hole periphery of the sound insulating cover member to the head cover member is performed by an elastic material separate from the oil seal member, the oil sealing performance is not as good as when both functions are performed by one member. In order to ensure that the sound insulation cover member is tightened with high surface pressure, the vibration transmission suppressing function to the sound insulation cover member will not deteriorate, and the sound insulation cover member can be firmly attached to the head cover member without impairing the function of the elastic material. This means that it can be fixedly supported.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

1 and 2 show a cylinder head cover A for an engine according to the present invention, and the cylinder head cover A includes a head cover member 1 made of, for example, aluminum casting, which covers the upper surface of a cylinder head (not shown) of the engine. The sound insulating cover member 4, made of, for example, a steel plate, is attached to the head cover member 1 via an elastic material 3 so as to cover the upper surface thereof while maintaining a predetermined sealed space 2.

Bolt holes 5, 5 are provided near the longitudinal ends of the head cover 1, while bolt holes 5, 5 are provided in the sound insulating cover member 4 at positions corresponding to the bolt holes 5, 5 of the head cover member 1, respectively.
Through holes 6, 6 having a diameter larger than 5 are formed, and a ring-shaped elastic member 7 is fitted to the peripheral edge of each through hole 6, and a holding fitting 8 is placed on the upper surface of the elastic member 7 at its center With the spring washer 9 interposed between the head cover member 1 and the upper surface of the head cover member 1, the center hole 8a of the presser metal fitting 8 and the bolts are inserted so that the holes 8a match the bolt holes 5 of the head cover 1. By inserting the fixing bolt 10 into the hole 5 and screwing the fixing bolt 10 into the cylinder head, the peripheral edge of the through hole 6 of the sound insulating cover member 4 is pressed and fixed to the head cover member 1 via the elastic material 7. The entire cylinder head cover A is configured to be fixed to the cylinder head.

Further, in the head cover member 1, an oil injection hole 11 for injecting lubricating oil into the engine is opened at a predetermined portion between the bolt holes 5, 5. A collar portion 12 that protrudes upward from the top surface of 1 is integrally formed. A cylindrical filler cap 13 with a bottom is removably fitted onto the collar portion 12 by locking its locking piece 13a to the opening edge of the collar portion 12. A ring-shaped oil seal member 2 that can come into contact with the upper end surface of the portion 12
0 is fitted and supported, and the filler cap 13
This closes the oil injection hole 11, and in the closed state, an oil seal member 20 is interposed between the abutting portion of the filler cap 13 and the collar portion 12 to provide a seal.

On the other hand, in the sound insulating cover member, a through hole 14 having an inner diameter larger than the outer diameter of the collar part 12 is provided at a portion corresponding to the oil injection hole 11 (collar part 12) of the head cover member 1. It is formed so as to penetrate above the member 4, and a ring-shaped elastic member 15 is attached to the peripheral edge of the through hole 14 with the wall surface of the center hole 15a in contact with the outer peripheral surface of the collar portion 12. . Then, the lower outer periphery 13b of the filler cap 13
constitutes a pressing portion for pressing the elastic material 15 against the upper surface of the head cover member 1, and as described above, when the oil injection hole 11 is closed by the filler cap 13, the lower outer periphery 13b of the filler cap 13 (the By pressing the elastic member 15 toward the head cover 1 at the head cover 1, the peripheral edge of the through hole 14 is pressed and held against the head cover member 1 through the elastic member 15.

Reference numeral 16 denotes an oil separator that separates oil from the blow-by gas of the engine using a baffle plate (not shown), and as shown in FIG. A blow-by gas introduction chamber 17 is recessed upward to accommodate a buff-full plate (not shown), and a blow-by gas introduction chamber 17 is provided on the side wall (head cover member 1) of the blow-by gas introduction chamber 17 through the sound insulating cover member 4. It is equipped with a discharge pipe 18 for discharging the blow-by gas in the gas introduction chamber 17 to the outside, and oil is removed from the blow-by gas introduced into the blow-by gas introduction chamber 17 by adhering to the buff-full plate in the introduction chamber 17. Afterwards, only the remaining gaseous blow-by gas is discharged through the exhaust pipe 18 and fed to the intake system of the engine. Further, numeral 19 denotes a sealing material fitted to the lower end surface of the head cover member 1, which airtightly seals the joining portion between the cylinder head of the cylinder head cover A when the cylinder head is attached to the cylinder head cover A.

Therefore, in the above embodiment, the engine cylinder head cover A is the head cover member 1.
and a sound insulating cover member 4, and has a double structure with a sealed space 2 between both cover members 1 and 4, so that engine noise, especially noise generated in the valve train of the cylinder head, leaks to the outside of the engine. This can be suppressed by the sealed space 2, thereby reducing engine noise.

Further, the peripheral edge of the through hole 14 of the sound insulating cover member 4, which is opened corresponding to the oil injection hole 11 of the head cover member 1, is inserted into the upper surface of the head cover member 1 through the elastic material 15 of the peripheral edge. 1
Since the structure is such that the oil injection hole 11 is pressed and held by the outer peripheral lower part 13b (pressing part) of the filler cap 13 when the filler cap 13 is closed, the peripheral edge of the through hole 14 can be closed by simply closing the oil injection hole 11 with the filler cap 13. Therefore, the end edge portion of the sound insulating cover member 4 can be fixed with a simple structure by effectively utilizing existing parts (filler cap 13).

In that case, when the oil injection hole 11 is blocked by the filler cap 13, the filler cap 1
3 Collar part 1 is sealed by the oil seal member 20 on the bottom.
2 and the upper end surface is sealed. As described above, the oil sealing property is ensured by the oil seal member 20 between the filler cap 13 and the collar portion 12, while the oil seal member 20 provides elastic support for the head cover member 1 at the peripheral edge of the through hole 14 of the sound insulating cover member 4. Since this is performed by a separate elastic material 15 from the sound insulating cover member 4, when tightening with high surface pressure to ensure oil sealing properties, as in the case where both functions are combined in one member, the sound insulating cover member 4 On the contrary, when the surface pressure is lowered to increase the vibration transmission suppressing function, the oil sealing function does not deteriorate. Both elastic support requirements can be effectively satisfied.

(Effects of the invention) As explained above, according to the invention, the head cover member is composed of a head cover member and a sound insulation cover member disposed above the head cover member, and a sealed space for sound insulation is provided between the two cover members. In the cylinder head cover having a heavy structure, an oil injection hole that is closed by a filler cap and has a collar is formed in the head cover member, and a through hole is formed in the sound insulation cover member corresponding to the oil injection hole, and the oil injection hole is closed by a filler cap and has a collar portion. The peripheral edge of the through hole is connected to the elastic material provided on the peripheral edge,
The filler cap presses and holds the oil injection hole when it is closed, and the oil seal member seals between the filler cap and the collar. The hole periphery can be firmly fixed to the head cover member using an existing filler cap with a simple structure and without impairing the vibration transmission suppressing function of the elastic material. This can contribute to improving the strength and reducing the number of parts to be joined to both cover members.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal sectional view of a cylinder head cover in the cylinder row direction, and FIG. 2 is a sectional view taken along the line -- in FIG. A... Cylinder head cover, 1... Head cover member, 2... Sealed space, 3... Elastic material, 4...
... Sound insulation cover member, 11 ... Oil injection hole, 12
...Color section, 13...Filler cap, 13
b...Press portion, 14...Through hole, 15...Elastic material, 16...Oil separator, 20...Oil seal member.

Claims (1)

[Scope of utility model registration request] A cylinder head cover with a double structure consisting of a head cover member that covers the cylinder head of the engine, and a sound insulating cover member attached to the head cover member via an elastic material so as to cover the upper surface of the head cover member while maintaining a predetermined sealed space. The head cover member is formed with an oil injection hole that is closed by a filler cap and has a collar portion whose peripheral edge protrudes above the upper surface of the head cover member, and the sound insulating cover member has an oil injection hole that is closed by a filler cap and has a collar portion that protrudes above the upper surface of the head cover member. A through hole larger than the outside diameter of the collar part is formed corresponding to the part, and when the filler cap closes the oil injection hole, an oil seal member is interposed at the abutting part of the filler cap and the collar part. A cylinder head cover for an engine, wherein the filler cap is formed with a pressing portion that presses and holds the peripheral edge of the through hole against the upper surface of the head cover member through an elastic material.