JPH061752U - Resin cylinder head cover - Google Patents

Abstract

(57) [Summary] [Purpose] Prevents cracking and damage of the cylinder head cover and partition plate made of synthetic resin. [Constitution] Inside the cylinder head cover 11 made of synthetic resin, a partition plate 12 of the same material having a blow-by gas inlet through hole 12a at one end and a drain port 12b at the other end is provided along the ceiling wall 11a. Then, a separation chamber 13 for removing oil is formed between the ceiling wall 11a and the middle partition plate 12, and a V-shaped fold portion 12c is formed in a part of the middle partition plate 12 in the width direction along the longitudinal direction. Both side edges of the inner partition plate 12 along the longitudinal direction of the inner partition plate 12 are fixed to the inner stepped portion 11b of the cover 11, but both end edges are abutted in a free state, so that the expansion and contraction of the middle partition plate 12 is slightly reduced. It is absorbed by the part 12c.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of a synthetic resin cylinder head cover for an engine.

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 composed of a rocker arm a, a valve rod b, a camshaft c, etc., disposed on the head is protected from dust. Although it is prevented from getting dirty, recently it is made of synthetic resin such as nylon to reduce the weight of the engine, and inside the cylinder head cover 1, a partition plate 2 is provided along the ceiling wall 1a. A separation chamber 3 is formed. Inside the separation chamber 3, a plurality of downward-facing and upward-facing collision plates 4a and 4b are alternately provided on the ceiling wall 1a and the middle partition plate 2 at intervals, and the middle partition plate 2 is An inlet hole 2a is provided at one end and a drain port 2b is provided at the other end, and an outlet pipe 5 is provided at the other end of the ceiling wall 1a and is connected to an intake pipe via a hose member. To do Has been done.

Then, the blow-by gas leaking into the engine during operation of the engine is introduced into the separation chamber 3 from the inlet through hole 2a through the cylinder head H by the suction operation, and strikes against the plurality of collision plates 4a and 4b and flows. The oil contained in the blow-by gas is separated by the upward and downward zigzag changes in the direction of the gas, and the gas from which the oil has been removed is returned from the outlet pipe 5 to the intake pipe side. I'm trying to drop it.

[0004]

[Problems to be solved by the device]

 By the way, it is general that the peripheral edge of the partition plate is fixed to a step part in the middle of the inside of the cover body by means of screws or welding, but in the past, the peripheral edges of the flat partition plate are flat. Since they are adhered to each other, it is impossible to absorb the thermal contraction due to the expansion and crystallization due to the heat during the operation of the engine, and the partition plate or the cover body is deformed or cracked.

Therefore, an object of the present invention is to prevent the intermediate partition plate and the cover body from being damaged even if they are affected by heat during engine operation.

[0006]

[Means for Solving the Problems]

 Based on the above-mentioned object, this invention is mounted on a cylinder head of an engine, and an inner partition plate having an inlet through hole for blow-by gas at one end and an oil drain port at the other end is provided on the inner side of the ceiling plate. As a cylinder head cover made of synthetic resin that is placed along the wall and forms a separation chamber between the ceiling wall and the partition wall, the drain port is opened on the bottom surface in a part of the partition wall. It is characterized in that the folds are formed along the longitudinal direction, and both side edges along the longitudinal direction of the partition plate are fixed to the cylinder head cover, but both end edges are contacted in a free state.

[0007]

【Example】

 1 to 3 show a cylinder head cover 11 according to the present invention, which is made of a synthetic resin having mechanical strength such as nylon, polyacetal or the like in a box shape, and is arranged on a cylinder head H. The valve mechanism M including a rocker arm a, a valve rod b, and a camshaft c is mounted on the cylinder head, and an inner partition plate 12 made of a synthetic resin of the same quality is provided inside the cover 11 for the ceiling wall 11a. A separation chamber 13 is formed between the ceiling wall 11a and the intermediate partition plate 12 so as to be arranged along the partition wall 12.

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

Then, both side edges of the middle partition plate 12 in the width direction are welded to the lower surface of the stepped portion 11b formed in the middle of the inside of the cylinder head cover 11 as shown in FIG. However, the both edges in the longitudinal direction are not welded and are in a free state simply by abutting.

On the other hand, on the ceiling wall 11a of the cylinder head cover 11, there is a first collision plate 14a having a height half that of the separation chamber 13 and a first collision plate 14a at a height close to the surface of the partition plate 12. Second collision plates 14b having horizontally long window holes 14c lower than the height of the collision plate 14a are alternately hung at a plurality of intervals, and an outlet pipe 15 is provided at the other end of the cover 11. The hose member is connected to the intake pipe.

Therefore, when the engine is operating, blow-by gas leaking into the engine is introduced into the separation chamber 13 through the cylinder head H from the inlet through hole 12 a of the partition plate 12 by the intake action of the engine. , The second collision plates 14a and 14b are alternately struck, and the lower side of the first collision plate 14a and the window holes 14c of the second collision plate 14b are alternately crossed so that the flow direction is zigzag vertically. The oil particles contained in the gas are changed and separated, and the blow-by gas from which the oil has been removed is sent from the outlet pipe 15 to the intake pipe side through the hose member, and the oil is drained from the drain port 12b to the cylinder head. Returned to H.

In the process, the middle partition plate 12 is exposed to the high temperature atmosphere flowing from the cylinder block and contracts or expands due to the progress of crystallization. Since a V-shaped fold 12c is formed along the longitudinal direction and both ends are in a free state without being fixed to the cylinder head cover 11, a slight dimensional change of the partition plate 12 due to thermal contraction or expansion. Is absorbed by the change in the opening degree of the folds 12c and is not directly transmitted to the head cover 11.

[0013]

[Effect of device]

 As described above, in the present invention, as a cylinder head cover made of synthetic resin for an engine, a fold along the longitudinal direction is formed in a part of the partition plate for forming a separation chamber for removing oil from blow-by gas inside. While both edges along the longitudinal direction are fixed to the head cover while both edges are abutted in a free state, the thermal contraction and expansion of the partition plate during engine operation are pleated. It can be properly absorbed depending on the degree of opening, and it can be used for a long time without the intermediate partition plate and cylinder head cover deforming or cracking.

[Submission date] November 4, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

[Prior art]

 Figure 4 shows the cylinder head cover for the engine. Mounted on the cylinder head H as shown in 5, The rocker arm a and the valve rod b arranged on the head, The valve mechanism consisting of camshaft c prevents the dirt from getting dirty. Recently, it is made of synthetic resin such as nylon to reduce the weight of the engine. And Inside the cylinder head cover 1, a partition plate 2 is provided along the ceiling wall 1a to form a separation chamber 3,  Inside the separation chamber 3, a plurality of downward facing ceiling walls 1a and partition plates 2, Upward collision plate 4a, 4b are provided alternately at intervals, The intermediate partition plate 2 has an inlet passage 2a at one end and a drain port 2b at the other end. An outlet pipe 5 is provided at the other end of the ceiling wall 1a, It is designed to be connected to the intake pipe via a hose member.

[Brief description of drawings]

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

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

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

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

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

[Explanation of symbols]

 11 Cylinder Head Cover 11a Ceiling Wall 12 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

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[Procedure amendment]

[Submission date] November 4, 1992

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 5

[Correction method] Change

[Correction content]

[Figure 5]

Claims (1)

[Scope of utility model registration request] 1. A partition plate, which is mounted on a cylinder head of an engine and has an inlet through hole for blow-by gas at one end and an oil drain port at the other end, is provided inside along a ceiling wall. Then, in a cylinder head cover made of a synthetic resin that forms a separation chamber between the ceiling wall and the intermediate partition plate, a part of the intermediate partition plate has a fold portion in which the drain port is opened on the bottom surface in the longitudinal direction. A resin cylinder head cover which is formed along the longitudinal direction of the partition plate and is fixed to the cylinder head cover at both side edges thereof, but is abutted at both end edges in a free state.