JPH0564444U - Cylinder head cover structure - Google Patents

Abstract

(57) [Summary] [Structure] An engaging hook 7b is formed on the side wall of a baffle plate 7 formed in a dish shape from a resin material, while an inward projection is formed on the shaft cover portion 4 (5) of the cylinder head cover 1. The locking rib 4a (5a) is formed, and the baffle plate 7 is attached to the cylinder head cover 1 side by the engagement between the engaging hook 7b and the locking rib 4a (5a). As a result, the workability of attaching the baffle plate 7 to the cylinder head cover 1 side is significantly improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of a cylinder head cover whose upper portion has a mountain-shaped cross section and which forms a hollow chamber with a baffle plate disposed on the inner wall side of the upper portion.

[0002]

[Prior Art]

 Conventionally, a cylinder head cover is generally provided with a communication pipe that communicates the engine body side with the intake system, and blow-by gas leaking from the engine body side is sent to the intake system through the communication pipe. In addition, as described above, the blow-by gas leaking from the engine body contains oil mist and carbon as its components, and if this was sent directly to the intake system, it would not be possible to send oil mist or carbon to the intake system device. Carbon adheres to the air intake, resulting in reduced intake function. For this reason, a baffle plate for separating oil mist and carbon in the blow-by gas is arranged on the inner wall side of the upper portion of the cylinder head cover.

As a method of attaching the baffle plate to the cylinder head cover, there is a method of vibrating and welding the baffle plate to the cylinder head cover, but such a method causes the generation of welding dust. Therefore, as a method of attaching the baffle plate, as disclosed in Japanese Utility Model Laid-Open No. 56-161160, a method of bolting the baffle plate and a method disclosed in Japanese Utility Model Laid-Open No. 63-105712 are disclosed. In addition, there has been proposed a method of fitting a protrusion formed on the cylinder head cover side into a mounting hole formed on a baffle plate.

[0004]

[Problems to be solved by the device]

 However, in the conventional method of bolting the baffle plate as described above, a plurality of bolts must be manually attached by an operator, which is a problem in terms of installation workability. On the other hand, the method of inserting the protrusion on the cylinder head cover side into the mounting hole of the baffle plate cannot reliably maintain the airtightness between the baffle plate and the cylinder head cover. However, there is a problem in that the baffle plate cannot fully perform its original function.

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the structure of the cylinder head cover according to claim 1 of the present invention is such that the upper part has a mountain-shaped cross section and a hollow chamber is formed between the upper part and the baffle plate arranged on the inner wall side. The following measures are taken in the structure of the cylinder head cover that forms the.

That is, the baffle plate is dish-shaped and has a plurality of engaging hooks formed on the side wall thereof, and the inner wall of the cylinder head cover is engaged with the engaging hooks. Locking ribs that support the baffle plate are formed.

Further, the structure of the cylinder head cover according to the second aspect is the same as the structure of the cylinder head cover according to the first aspect, and the following measures are taken.

That is, one of the side walls of the baffle plate or the locking rib of the cylinder head cover is formed with a fitting protrusion, while the other is fitted with the fitting protrusion. A fitting recess is formed so that the baffle plate and the cylinder head cover are in close contact with each other.

[0009]

[Action]

 According to the structure of the cylinder head cover of claim 1, the baffle plate is attached to the cylinder head cover by the engaging hook formed on the side wall of the baffle plate and the locking rib formed on the cylinder head cover side. It is done by the engagement of. For this reason, the baffle plate installation work can be performed simply by engaging the engagement hooks of the baffle plate with the locking ribs on the cylinder head cover side, which greatly improves the baffle plate installation work efficiency. Can be made.

Further, according to the structure of the cylinder head cover of the second aspect, the side wall of the baffle plate or the engaging rib formed on one of the locking ribs of the cylinder head cover, and the other By fitting with the fitting protrusion formed on the, the baffle plate and cylinder head cover can be in close contact with each other when the baffle plate is attached to the cylinder head cover. It is possible to reliably prevent mixing of oil.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. 1 to 9. In this embodiment, the structure of the cylinder head cover is applied to a DOHC type engine.

As shown in FIGS. 1 and 2, the cylinder head cover 1 according to the present embodiment has a box-like shape with an outer shape that is a substantially rectangular shape in bottom view and an opening on the bottom side (see FIGS. 1 and 2). 2 are shown from the bottom side), and mounting holes 1a for bolting the cover 1 to the engine body 10 are drilled in the outer peripheral edge of the lower end in the state shown in FIG. There is. Further, the cylinder head cover 1 has one end side in the longitudinal direction divided by a dividing wall 1b, one of which is formed as a shaft cover chamber 2 which covers a pair of left and right camshafts 11 and 12, while the other is shown. It is formed as a belt cover chamber 3 that covers the timing belt.

The shaft cover chamber 2 is provided with left and right shaft cover portions 4 and 5 extending parallel to the respective axial center directions of the camshafts 11 and 12 on the engine body 10 side, and the respective cover portions 4 and 5 are provided. -One end of the belt cover chamber 3 side of 5 is communicated, and is provided in a substantially U shape in a bottom view. Further, cam shafts 11 and 12 are provided so as to penetrate through the divided wall 1b located on one end side of the shaft cover portions 4 and 5 and the side wall located on the other end side of the shaft cover portion 5, respectively. Arch-shaped cutouts 1c ... Are formed, and a fitting groove 1d for fitting the seal packing 6 is formed on the lower edge of the entire circumferential wall of the shaft cover chamber 2 including the cutouts 1c. Are laid in a continuous shape. The seal packing 6 is designed to maintain airtightness between the shaft cover chamber 2 and the engine body 10 side when the cylinder head cover 1 and the engine body 10 are attached.

Further, as shown in FIG. 3, the shaft cover portions 4 and 5 each have an upper portion having a mountain-shaped cross section, and the baffle plate 7 is disposed on the inner wall side of the upper portion, whereby the upper wall portion A hollow chamber 8 is formed between the baffle plate 7 and the baffle plate 7. As shown in FIG. 4, a communication pipe 9 for communicating the hollow chamber 8 with an intake system (not shown) is provided at the other end of the shaft cover portion 5.

As shown in FIG. 5, the baffle plate 7 is formed of a resin material in a rectangular dish shape, a communication hole 7a is formed in the bottom surface thereof, and the baffle plate 7 faces each other in the width direction. A plurality of engagement hooks 7b are formed on the side wall. On the other hand, a pair of left and right locking ribs 4a and 5a are respectively extended inwardly on the upper inner walls of the respective cover portions 4 and 5 in the longitudinal direction. The engaging hooks 7b of the baffle plate 7 are engaged with the engaging ribs 4a (5a) of the shaft cover portion 4 (5) as shown in FIGS. Is supported on the inner wall side of the upper portion of the shaft cover portion 4 (5).

In the engagement between the engaging hook 7b and the locking rib 4a (5a) as described above, a notch 7c is formed on the back side of the engaging hook 7b in an under-shape by punching. As a result, the flexibility of the engaging hook 7b in the direction A is improved, while the inclined portion 4b (5b) is formed at the engaging portion of the locking rib 4a (5a) with the engaging hook 7b. Thus, the insertability of the engaging hook 7b in the B direction is improved. Further, as a basic dimension that causes a smooth engagement operation between the engagement hook 7b and the engagement rib 4a (5a) as described above, the engagement width W of the engagement hook 7b is determined by the engagement rib 4a (5a). ) It is formed shorter than the locking thickness H.

As described above, the cylinder head cover 1 of this embodiment is attached to the upper end of the engine body 10 with the seal packing 6 maintaining the airtightness between the shaft cover chamber 2 and the engine body 10 side. The belt cover chamber 3 covers the timing belt, and the shaft cover portions 4 and 5 forming the shaft cover chamber 2 individually cover the camshafts 1 and 12 respectively. Baffle plates 7 and 7 made of resin are disposed on the respective 4.5.

As a result, in the blow-by gas leaking from the engine body 10 side, after the oil mist and carbon contained therein are separated by the baffle plate 7, the blow-by gas is passed from the communication pipe 9 to the intake system via the hollow chamber 8. It is supposed to be sent out.

By the way, the baffle plate 7 for separating the oil mist and carbon from the blow-by gas as described above has a dish shape, and a plurality of engaging hooks 7b ... Are formed on the side wall thereof. The engaging hooks 7b ... Are engaged with the locking ribs 4a (5a) of the cover portion 4 (5) to be supported on the upper inner wall side of the cover portion 4 (5).

Therefore, the attachment of the baffle plate 7 to the cylinder head cover 1 is as simple as engaging the engaging hook 7b of the baffle plate 7 with the locking rib 4a (5a) of the shaft cover portion 4 (5). This can be done manually, and the workability of attaching the baffle plate 7 can be greatly improved.

Further, in the attachment of the baffle plate 7 to the cylinder head cover 1 as described above, as shown in FIGS. 8 and 9, a fitting protrusion 7 d is formed on the upper edge of the side wall of the baffle plate 7. On the other hand, by forming the fitting concave portion 4c (5c) which fits the fitting convex portion 7d on the locking rib 4a (5a) of the shaft cover portion 4 (5), the baffle plate 7 and the shaft cover portion 4 are formed. A close contact can be made between (5) and, as a result, the separability of oil mist and carbon from blow-by gas can be further improved.

The above embodiment is not intended to limit the present invention, and various modifications can be made within the scope of the present invention. For example, in the above-described embodiment, the cylinder head cover 1 is constituted by the shaft cover chamber 2 having the respective shaft cover portions 4 and 5 and the belt cover chamber 3 so that the cylinder head cover 1 can be applied to the DOHC type engine. However, the type of applicable engine is not limited. Therefore, the structure of the cylinder head cover other than the structure for mounting the baffle plate 7 is not particularly limited.

Further, in order to bring the baffle plate 7 and the shaft cover portion 4 (5) into close contact with each other, the baffle plate 7 is provided with a fitting convex portion 7 d and the shaft cover portion 4 (5). Forms a fitting recess 4c (5c), the fitting recess is formed on the side of the baffle plate 7, while the fitting projection that fits with the fitting recess is formed on the side of the shaft cover 4 (5). By forming the portion, the baffle plate 7 and the shaft cover portion 4 (5) can be brought into close contact with each other.

[0024]

[Effect of the device]

 As described above, in the structure of the cylinder head cover according to claim 1 of the present invention, the baffle plate is dish-shaped and the side walls thereof are formed with a plurality of engaging hooks. The inner wall is formed with locking ribs that are engaged with the above-mentioned engaging hooks and support the baffle plate.

As a result, the baffle plate can be attached to the cylinder head cover by a simple manual work of engaging the engagement hook of the baffle plate with the locking rib on the cylinder head cover side. This has the effect of significantly improving workability.

Further, the structure of the cylinder head cover according to claim 2 is the structure of the cylinder head cover according to claim 1, wherein one of the side walls of the baffle plate or the locking ribs of the cylinder head cover is On the other hand, a fitting concave portion is formed, and on the other side, a fitting concave portion is formed which fits with the fitting convex portion to bring the baffle plate and the cylinder head cover into a close contact state. ..

With this, when the baffle plate is attached to the cylinder head cover, the baffle plate and the cylinder head cover can be brought into close contact with each other, so that the airtightness between them can be sufficiently maintained. As a result, it is possible to provide a cylinder head cover that is easy to install the baffle plate and reliably prevents oil from entering.

[Brief description of drawings]

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

FIG. 2 is a bottom view showing the cylinder head cover.

FIG. 3 is a vertical cross-sectional view showing a state in which a baffle plate is provided on the upper inner wall side of the cylinder head cover.

FIG. 4 is a vertical cross-sectional view showing a state in which a hollow chamber formed between the cylinder head cover and a baffle plate is connected by a communication pipe.

FIG. 5 is a perspective view showing the baffle plate.

FIG. 6 is a perspective view showing a state in which an engagement hook of the baffle plate is engaged with a locking rib on the cylinder head cover side.

FIG. 7 is a vertical cross-sectional view showing an engaged state between the engaging hook and the locking rib.

FIG. 8 is a partial perspective view showing a baffle plate in which a fitting convex portion is formed on an upper edge portion of a side wall.

FIG. 9 is a vertical cross-sectional view showing a fitted state of the fitting protrusion of the baffle plate and the fitting recess of the locking rib.

[Explanation of symbols]

 1 Cylinder Head Cover 2 Shaft Cover Chamber 4.5 Shaft Cover Section 4a / 5a Locking Rib 4c / 5c Fitting Recess 7 Baffle Plate 7b Engaging Hook 7d Fitting Convex 8 Hollow Chamber

Claims (2)

[Scope of utility model registration request] 1. A structure of a cylinder head cover in which an upper portion has a mountain-shaped cross section and a hollow chamber is formed between the upper portion and a baffle plate disposed on the inner wall side of the upper portion, wherein the baffle plate has a dish shape. , The side wall is formed with a plurality of engaging hooks, and the inner wall of the cylinder head cover is formed with locking ribs that engage with the engaging hooks and support the baffle plate. Characteristic cylinder head cover structure. 2. A fitting protrusion is formed on one of the side walls of the baffle plate or the locking rib of the cylinder head cover, and the other is fitted with the fitting protrusion. The structure of a cylinder head cover according to claim 1, wherein a fitting recess is formed so as to bring the baffle plate and the cylinder head cover into a close contact state.