JPH064015Y2 - Cylinder head cover structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a cylinder head cover structure in which an oil separator is integrally attached to a cylinder head to form a blow-by gas passage for removing oil mist. The present invention relates to a cylinder head cover structure in which a sealing portion that is integrally molded of resin and exhibits a high sealing property and a portion that is locked to a cylinder head cover are independently formed so as not to affect each other.

[Prior Art] In general, there is a blow-by gas reduction device that returns the blow-by gas to the intake side and re-combusts it in order to prevent the blow-by gas in the cylinder head cover from being released into the atmosphere as it is.

However, in order to return this blow-by gas to the intake side, it is necessary to remove the oil mist, so a baffle plate support device for a soft rocker cover (Japanese Utility Model Publication No. 57-54643) and a cylinder head cover proposed by the applicant (actual application). There is Sho 60-53158 (see Japanese Utility Model Sho 61-169218).

As shown in FIG. 18, the supporting device has a rocker cover (cylinder head cover) a made of a soft resin, in which a gas-liquid separation chamber b which is recessed upward is formed, and which is continuously fitted below the gas-liquid separation chamber b. The groove c is formed, and the baffle plate d is fitted in the fitting groove c.

However, the configuration in which the baffle plate d is attached below the gas-liquid separation chamber b has a problem that the separated oil leaks from between the fitting groove c and the baffle plate d. Further, since the gas-liquid separation chamber b has a large opening area with respect to the blow-by gas outlet port e, the oil component may be discharged before being removed.

Therefore, as shown in FIG. 19, the present applicant forms a blow-by gas passage k by providing an oil separator g having an inner partition wall f erected on the upper surface and a locking means j on the upper inner wall i of the resin cover body h. Cylinder head cover to configure.

[Problems to be Solved by the Invention] However, spherical concavo-convex portions m and n, which are engaged with each other as the locking means j, are provided on the baffle plate of the cover main body h and the oil separator g of the proby-gas passage k. The continuous formation along the passage direction causes a problem in the die-cutting direction in the molding process, and requires a mold for molding to be a plurality of split molds, or to require a plurality of slide nests. It was expensive.

[Means for Solving Problems] The present invention aims to solve the above problems,
According to the present invention, a partition wall is formed in an oil separator connected to a cylinder head cover to form a series of blow-by gas passages that are folded back a plurality of times, and the oil separator has a seal portion closely attached to the cover along the passage. And a locking means which is locked to the hook portion of the cover at a distance from the passage, are integrally molded to form a cylinder head cover structure.

[Operation] By connecting the locking means of the oil separator to the hook portion of the cylinder head cover, the seal portion of the oil separator is brought into close contact with the cylinder head cover. Therefore, the blow-by gas passage for removing the oil mist by the passage pressure loss is formed by the oil separator and the cylinder head cover.

[Embodiment] A preferred embodiment of the cylinder head cover structure of the present invention will be described below with reference to the accompanying drawings.

1 is a lightweight cylinder head cover made of a resin material, and 2 is an oil separator connected to a ceiling plate 3 of the cylinder head cover 1 to form a blow-by gas passage.

As illustrated, the cylinder head cover 1 is formed in a box shape. As shown in FIG. 2, the ceiling plate 3 of the cylinder head cover 1 that forms the bottom of the box is formed with blow-by gas G outlets 4 at the end portions in the width direction and the longitudinal direction.
In this embodiment, the connecting pipe portion 5 is formed integrally with the outlet 4. The oil separator 2 is formed in a box shape. Inside the oil separator 2, the widthwise direction is divided into two parts, one end is connected to the longitudinal side plate 6 and the other end is connected to the other side plate 7. A partition wall 8 is provided upright with a predetermined distance between the partition wall 8 and the ceiling wall 3 connected to the ceiling plate 3.

Further, in the side plate 6 on the side to which the partition wall 8 is connected, one space formed with the partition wall 8 as a boundary is opened and the intake port 9 is formed.
Are formed. On the upper edges of the side plates 10 and 11 of the oil separator 2 in the longitudinal direction of the box, the parts along the upper edges are bent substantially inward at the inside of the box, and the side plates 6 and 7 in the width direction of the box are formed. The upper edge is formed by bending a portion along the upper edge outward at a substantially right angle. These bent portions form a seal plate 16 that is in close contact with the ceiling plate 3. This becomes the seal part.

Therefore, by bringing the sealing surface formed by the sealing plate 16 into close contact with the ceiling plate 3 and positioning the outlet 4 in the space opposite to the inlet 9 with the partition wall 8 as a boundary, the inlet 9 The blow-by gas passage 17 that is folded back from the outlet to the outlet 4 is formed. At the time of joining, between the ceiling plate 3 and the seal plate 16 or the ceiling plate 3
With the seal plate 16 and the seal plate 16 joined together, a silicone-based seal material, such as RTV (room temperature vulcanizing silicon), is applied to the inside or the outside of the box in the direction of the side plate or one of them. After vulcanization, this silicone-based sealing material becomes the gasket 18 that exhibits high sealing properties.

By the way, as the shape of the seal plate 16, other shapes shown in FIGS. 4 to 6 can be considered.

The seal plate 16 having the shape shown in FIG.
And the ceiling plate 3 are provided with an appropriate inclination to facilitate filling of the above-mentioned silicone rubber serving as the gasket 18 in the gap formed by the inclined surface and the ceiling plate 3, and this inclination is applied to the seal plate 16. A strong spring back is easily given to increase the contact surface pressure of the seal plate 16 to achieve high sealing performance.

The seal plate 16 having the shape shown in FIG.
The seal plate 16 has substantially the same shape as that of the embodiment shown in FIG. 3, and in this case, the groove portion 21 for housing the seal plate 16 in the ceiling plate 3.
Seal plate 1 that forms the end of the box in the width and length directions
It is intended to exert the sealing property also on the side portion of 6.

The seal plate 16 shown in FIG. 6 includes side plates 6, 7, 10, 1.
1, a groove 22 having a U-shaped cross section is continuously formed along the upper edge of the ceiling plate 1, and a protrusion 23 into which the groove 22 is fitted is provided on the ceiling plate 3. The silicone rubber is applied to or filled in the seal plate 16 of these examples, if necessary.

Next, a configuration for connecting the cylinder head cover 1 and the oil separator 2 will be described.

As shown in FIG. 7, the side plates 6, 7, 10, 11 and the partition wall 8 of the oil separator 2 of FIGS. 1 and 3 serve as locking means at appropriate intervals along the blow-by gas passage 17. The locking bracket 25 is formed. The locking bracket 25 is provided at a portion along the longitudinal direction of the box.

The shape of the locking bracket 25 in the embodiment is such that the side plates 6, 7, 10, 1 are substantially parallel to the baffle plate 2a serving as the bottom plate of the oil separator 2.
1 is extended in the width direction of the box, and the tip end side of the extended portion is folded and formed on the ceiling plate 3 side. The bent portion 26 includes side plates 6, 7, 10, 1
It is substantially parallel to 1. In addition, the bent portion 26
A hook portion 27 extending in the direction of the side plates 6, 7, 10, 11 is formed at the tip of the. On the other hand, also on the partition wall 8, locking brackets 25 having the same shape as the locking brackets 25 provided on the side plates 6, 7, 10, 11 are formed at the positions of both ends in the longitudinal direction of the box. In this case, the extending direction is the width direction of the blow-by gas passage 17.

With the seal plate 16 of the oil separator 2 in contact with the cylinder head cover 1 at the position described above, the bracket 25 for locking the side plates 6, 7, 10, 11 and the bracket 25 for locking the partition wall 8 are provided. A hook plate 28 for connecting with is provided. The hook plate 28 is provided upright from the ceiling plate 3 toward the oil separator 2 side.
The tip of the hook is a hook 29 that is engaged with the hook 27 of the locking bracket 25.

Therefore, the spring back is arbitrarily set so that the seal plate 16 can obtain a desired contact surface pressure on the ceiling plate 3, and the locking bracket 2 is set at a position where the contact pressure is equal to or higher than the contact surface pressure.
The hook portion 27 of No. 5 and the hook portion 29 of the hook plate 28 are formed in such a positional relationship that they are engaged with each other. As a result, it is possible to prevent vibrations generated between them.

By the way, as the shapes of the locking bracket 25 and the hook plate 28, those shown in FIGS. 8 to 13 can be considered.

The locking bracket 25a shown in FIG. 8 is formed along the longitudinal direction of the box in place of the hook portion 27 of FIG. 7 so that the hook portion 29 of the hook plate 28 of FIG. 7 is locked. It is a stop groove 30.

An arrow-shaped hook portion 27a extending in both directions with respect to the width direction of the box is formed at the tip of the bent portion 26 shown in FIG. 9, and the hook portion 27a is locked to the ceiling plate 3. An example in which two hook plates 28 are provided is shown. In this case, the hook plate 2 of the ceiling plate 3 with which the hook portion 27a is engaged
8 may be branched and formed in a U shape.

In the locking bracket 25c shown in FIG. 10, the front end side of the bent portion 26 is formed into a bifurcated shape, and is further bent in the width direction of the box and in the opposite directions. Hook part 29 at the tip
Are formed respectively. On the other hand, the ceiling plate 3 has the hook plate 2 having the locking groove 30 described in FIG.
8 are provided. In addition, the ceiling plate 3 is cut into the forked portion 32 formed by the two bent portions 31, and the forked portion 3 is formed.
The opening degree of 2 is formed, that is, the projecting portions 33 having a chevron cross section are formed to guide and lock both the bent portions 31 into the respective locking grooves 30.

The locking bracket 25d shown in FIG. 11 (a) is locked to the bent portion 31a by bending the tip of the bent portion 26 further outward in the width direction of the box with respect to the hook plate 28 of FIG. An example in which the groove 34 is formed is shown. Also, the first
As shown in FIG. 1B, slits 35 in the width direction are formed at both ends of the locking groove 34 so that the hook plate 28 can be easily engaged.

A locking bracket 25e shown in FIG. 12 has a hooked portion 27b having a hemispherical cross section as shown in FIG. 13 formed at the tip of the bent portion 26 in place of the hook portion 27a. Instead of the hook plate 28 for locking, a locking hole 29b into which the locking portion 27b can be fitted is formed.
In this case, in order to improve the fitting property, it is possible to form the slit 36 in the locking portion 27b, and the slit 36 may be provided in the locking bracket 25e.

Below, the main locking bracket 25 and hook plate 28
The formation will be described.

Bracket 25 for locking and hook plate 28 described in FIG.
Is molded by a mold 50 as shown in FIGS. In this case, in order to facilitate the removal of the mold, the hook plate 28 or the locking bracket 25 is attached to the lower end of the upper mold 51.
A push-out pin 53 that guides the hook portion 27 in the width direction (the direction in which the hook portion 27 comes off) is provided obliquely. The lower die 52 is provided with a guide hole 54 for guiding the pushing pin 53 in the tilt direction. Further, the upper mold 51 and the lower mold 52 are combined with each other by their tapered surfaces 55a and 55b. Naturally, the inclination angles of the tapered surfaces 55a and 55b and the inclination angle of the push-out pin 53 match. In this case, since the die removing direction is the width direction with respect to the hook plate 28, it is possible to increase the distance between the hook plates 28 in the longitudinal direction.

The hook plate 28 described with reference to FIG. 10 can be molded by a mold for drawing in the same direction as the mold 50 described with reference to FIG. 14, that is, a mold 59 shown in FIG. . In this case, as shown in FIG. 15 (e), the locking bracket 2
The locking groove 30 is formed in 5c by a slide nest.

The locking bracket 25 shown in FIG.
As shown in FIGS. 6 (g) and 6 (h), the lower die 57 and the upper die 58 are formed such that the pulling directions are aligned with the longitudinal direction of the locking bracket 25. Therefore, in this case, the push-out pin 53 and the guide hole 54 are set to have an inclination angle that matches the inclination angle of the taper surface of the die. Further, since the locking bracket 25 can be formed partially shorter than the conventional example, it is possible to pull out in the width direction by the slide nest.

Next, another embodiment of the locking bracket and the hook plate will be described.

FIG. 17 (i) shows the side plates 6, 7, 10, 11 and the partition wall 8.
Shows an example in which the bent portion 26 of the locking bracket 25 is also used. That is, the hook portion 27 is formed on the side plate 6, 7, 10, 11 or the side portion of the partition wall 8.

FIG. 17 (nu) is formed by a recessed portion 60 in which the side plates 6, 7, 10, 11 or the partition wall 8 are recessed inward in the width direction thereof in place of the hook portion 27 of FIG. 17 (re). Here is an example.

[Effects of the Invention] As is apparent from the above description, the cylinder head cover structure of the present invention can exert the following excellent effects.

(1) An oil separator joined to a cylinder head cover to form a blow-by gas passage, a seal portion airtightly joined along the passage, and a hook portion of the cover partially locked along the passage. Since the locking means is provided, the oil separator can be easily attached to the cylinder head cover.

(2) It is easy to manufacture and can be provided at low cost.

(3) Sealability can be greatly improved and reliability can be improved.

[Brief description of drawings]

1 is a sectional view showing a preferred embodiment of the present invention, FIG. 2 is a perspective view of a cylinder head cover, FIG. 3 is a perspective view of an oil separator, and FIGS. 4 to 6 show the shape of a seal plate. Partial sectional view, FIG. 7 is a partial sectional view showing a basic example for locking the hook part and the locking bracket, and FIGS. 8 to 13 are other embodiments of the hook part and the locking bracket. Partial sectional views showing examples, FIGS. 14 to 16 are schematic views showing molding of hook portions or locking brackets, and FIG. 17 is partial sectional views showing other embodiments of hook portions and locking brackets. 18 and 19 are schematic sectional views showing a conventional example. In the figure, 1 is a cylinder head cover, 2 is an oil separator, 3 is a ceiling plate, 4 is an outlet, 8 is a partition wall, 9 is an inlet, 16 is a seal plate forming a seal portion, 17 is a blow-by gas passage, 25 Is a bracket for one of the locking means,
28 is a hook plate having a hook portion.

Claims (4)

[Scope of utility model registration request] 1. A partition wall is formed in an oil separator connected to a cylinder head cover to form a series of blow-by gas passages that are folded back a plurality of times, and the oil separator is closely attached to the cover along the passage. A cylinder head cover structure, characterized in that a seal part and a locking means which is locked to the hook part of the cover are formed integrally with each other with a space between them. 2. The utility model registration claim, wherein the oil separator has an inlet for the blow-by gas passage on a side portion thereof, and an outlet is formed at a position where the cylinder head cover is a rear end of the blow-by gas passage. Cylinder head cover structure according to claim 1. 3. The utility model registration claim 1 according to claim 1, wherein the locking means is formed by extending outward from the side plate of the oil separator in the width direction and further bent toward the cylinder head side. Cylinder head cover structure. 4. The locking means is formed by being extended outward in the width direction from a side plate of the oil separator and further bent toward the cylinder head cover side, and the hook portion is fitted to the bent portion to engage the engaging means. The cylinder head cover structure according to claim 1, wherein the utility model registration is configured by forming a locking hole or a locking groove to be stopped.