JP2602267Y2 - Resin cylinder head cover - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION This invention relates to an improvement in a cylinder head cover made of synthetic resin for an engine.

[0002]

2. Description of the Related Art A cylinder head cover for an engine is mounted on a cylinder head H as shown in FIGS. 4 and 5, and a valve operating mechanism comprising a rocker arm a, a valve stem b, a camshaft c and the like disposed on the head. Although it is prevented from being contaminated by dust, recently it is made of synthetic resin such as nylon to reduce the weight of the engine, and an inner partition plate 2 is provided inside the cylinder head cover 1 along the ceiling wall 1a. A separation chamber 3 is formed. Inside the separation chamber 3, a plurality of downward and upward collision plates 4a and 4b are provided alternately at intervals on the ceiling wall 1a and the middle partition plate 2, and the middle partition plate 2 One end has an inlet hole 2a and the other end has a drain port 2b. The other end of the ceiling wall 1a is provided with an outlet pipe 5 and is connected to an intake pipe via a hose member. Like to do To have.

Then, blow-by gas leaking into the engine during operation of the engine is guided into the separation chamber 3 from the inlet through hole 2a through the cylinder head H by an intake operation.
The oil contained in the blow-by gas is separated by the abutment against the plurality of collision plates 4a, 4b and the change in the vertical zigzag direction of the flow, and the gas from which the oil has been removed is returned from the outlet pipe 5 to the intake pipe side. Oil drain port
The liquid is dropped into the cylinder head from 2b .

[0004]

In the meantime, the above-mentioned partitioning plate is generally fixed at its peripheral portion to a step portion in the middle of the cover main body by means of screws or welding, but conventionally, it is uniform. Since the four peripheral edges of the flat partition plate are fixed, it is not possible to absorb thermal shrinkage due to heat expansion and crystallization during operation of the engine, and deformation or deformation of the partition plate or cover body may occur. Cracks occur.

[0005] Therefore, an object of the present invention is to prevent the partition plate and the cover body from being damaged even when the engine is affected by heat during operation.

[0006]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention is mounted on a cylinder head of an engine, and has a blow-by gas inlet hole at one end and an oil drain at the other end. A partition plate made of synthetic resin having a mouth is disposed along the ceiling wall, and a cylinder head cover made of a synthetic resin forming a separation chamber between the ceiling wall and the partition plate is used as one of the partition plates. In the part, a V-shaped fold with the drain opening opened at the bottom is formed along the longitudinal direction, and both side edges along the longitudinal direction of the partitioning plate are fixed to the cylinder head cover, The part is characterized in that it abuts in a free state.

[0007]

1 to 3 show a cylinder head cover 11 according to the present invention. The cylinder head cover 11 is formed of a synthetic resin having mechanical strength such as nylon or polyacetal in a box shape, and is disposed on a cylinder head H. It is mounted on the cylinder head over a valve mechanism M including a rocker arm a, a valve stem b, a camshaft c, and the like, and is provided inside the cover 11 with a middle partition plate 12 made of the same synthetic resin.
Are arranged along the ceiling wall 11a, and the ceiling wall 11a
A separation chamber 13 is formed between the partition chamber 12 and the partition plate 12.

The partition plate 12 has a blow-by gas inlet hole 12a at one end in the longitudinal direction and an oil drain port 12b at the other end, but the partition plate 12 has a part in the width direction. A V-shaped fold 12c is formed along the longitudinal direction, and the drain port 12b is provided to be open at the bottom of the fold 12c.

The intermediate partition plate 12 has both side edges in the width direction welded to the lower surface of a step portion 11b formed in the middle of the cylinder head cover 11 as shown in FIG. 2 by means of a hot plate, ultrasonic waves, or the like. However, both edges in the longitudinal direction are in a free state only by abutting without welding.

On the other hand, the first collision plate 14a, which is about half the height of the separation chamber 13, is provided on the ceiling wall 11a of the cylinder head cover 11, and the first collision plate 14a is brought into contact with the upper half at a height close to the surface of the partition plate 12. A second collision plate 14b having a horizontally long window hole 14c lower than the height of the plate 14a is alternately provided at a plurality of intervals, and an outlet pipe 1 is provided at the other end of the cover 11.
5 is provided and is connected to the intake pipe via a hose member.

Therefore, during operation of the engine, blow-by gas leaking into the engine is introduced into the separation chamber 13 through the cylinder head H from the inlet through-hole 12a of the partition plate 12 by the suction action of the engine, and the first and second blow-by gases are discharged. The second collision plate 14a and the second collision plate 14b alternately abut against the second collision plate 14a and the window hole 14c of the second collision plate 14b. The oil particles contained therein are separated and the blow-by gas from which oil has been removed is supplied to the outlet pipe 1
5 is sent to the intake pipe side via a hose member, and the oil is returned into the cylinder head H from the drain port 12b.

In the process, the partition plate 12 is exposed to a high-temperature atmosphere flowing from the cylinder block, and contracts or expands due to the progress of crystallization. V-shaped fold 1 along the direction
2c are formed, and both ends are cylinder head covers 1
Since it is not fixed to 1 and is in a free state, a slight dimensional change of the partition plate 12 due to thermal contraction or expansion is absorbed by a change in the opening degree of the fold 12c, and is not directly transmitted to the head cover 11.

[0013]

In the above manner the invention, according to the invention] As the synthetic resin cylinder head cover for an engine, the intermediate partition plate made of synthetic resin forming the separation chamber for removing oil from blow-by gas inside Partly along the length
While providing a V-shaped fold with a drain port on the bottom ,
Both side edges along the longitudinal direction are fixed to the cylinder head cover, but both ends are abutted in a free state, so the thermal contraction and expansion of the partition plate during engine operation can be reduced by opening the folds. It can be appropriately absorbed, and can be used for a long time without deformation or cracking of the partition plate or the cylinder head cover.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention mounted on a cylinder head.

FIG. 2 is a cross-sectional view in the same lateral direction.

FIG. 3 is a perspective view of a part of a cover showing an arrangement state of an intermediate partition plate.

FIG. 4 is a longitudinal sectional view of a conventional product.

FIG. 5 is a lateral sectional view of a conventional product.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Cylinder head cover 11a Ceiling wall 12 Middle partition plate 12a Inlet through hole 12b Drain port 12c Fold 13 Separation chamber 14a First collision plate 14b Second collision plate 14c Window hole H Cylinder head M Valve mechanism

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F02F 7/00 F01M 13/04 F16M 1/026

Claims (1)

(57) [Scope of request for utility model registration] 1. A blow-by gas inlet through hole 1 which is mounted on a cylinder head H of an engine and has an inside at one end.
2a having an oil drain port 12b at the other end.
The partition plate 12 made of synthetic resin along the ceiling wall 11a arranged, the separation chamber between the ceiling wall 11a and the inner partition plate 12 13
In the cylinder head cover made of a synthetic resin, a part of the partition 12 is provided with the drain port 12b.
The forming a V-shaped fold portion 12c which is opened in the bottom surface along the longitudinal direction, the longitudinal direction along both side edges opposite edges portions will be fixed to the cylinder head cover 11 of the intermediate partition plate 12 is free state A resin cylinder head cover that comes into contact with the cylinder head.