JPH08334069A - Intake manifold integrated locker cover of internal combustion engine - Google Patents

Abstract

PURPOSE: To cope with various specifications for an FR car and an FF car or the like without molding the whole of a locker cover in a separate shape. CONSTITUTION: A locker cover 1 is formed in a shape in which a cover part 11 to define a valve system chamber, plural branch parts 12 and a collector part 13 are integrally formed. The tips of the branch parts 12 are connected to an intake air port 3 of a cylinder head 1. The collector part 13 is molded by being predivided into a collector base part 13A containing a connecting part with the branch parts 12 and a collector cover part 13B containing a throttle chamber installing flange 15, and are mutually and integrally formed by welding or the like. 1n order to cope with different specifications, various collector cover parts 13B are prepared, and are properly selected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an internal combustion engine provided with an intake manifold integrated rocker cover in which an intake manifold is integrally formed with a rocker cover covering an upper surface of a cylinder head.

[0002]

2. Description of the Related Art An intake manifold-integrated rocker cover in which a part or the whole of the intake manifold is integrally formed with a rocker cover that covers the upper surface of a cylinder head of an internal combustion engine has been conventionally known. As an example, FIG.
2 shows a main part of an internal combustion engine equipped with an intake manifold-integrated rocker cover described in Japanese Patent Publication No. 211657.

In this example, a cylinder head 51 mounted and fixed on the upper surface of a cylinder block (not shown) is divided into a lower portion 51A and an upper portion 51B along a dividing plane 52 passing through the centers of a pair of cam shafts 53. ing. The intake port 5 is provided in the lower portion 51A which is a main part of the cylinder head 51.
4 and the exhaust port 55 are formed in a cross flow type. The upper portion 51B is fixed to the upper surface of the lower portion 51A by a plurality of bolts 59, and the camshaft 53 is supported between the two.

A rocker cover 56, which covers the upper surface of the cylinder head 51, is integrally formed with a plurality of branch portions 57 serving as an intake manifold and a collector portion 58. The branch portion 57 is formed along the width direction of the rocker cover 56 so as to cross the cylinder head 51 from the intake side to the exhaust side. One end of the branch portion 57 extending toward the intake side of the cylinder head 51 projects laterally and is curved downward. The tip of the branch portion 57 is connected to the intake port 54 of the cylinder head 51 via the intake pipe 61. The other ends of the branch parts 57 are connected to the collector parts 58, respectively. The collector portion 58 is formed in a state of laterally overhanging from the side surface of the cylinder head 51, and is located above an exhaust manifold (not shown). The rocker cover 56 integrally including the branch portion 57 and the collector portion 58 as described above is fixed to the cylinder head 51 via a plurality of bolts 60. Although not shown, a throttle chamber is attached to one end of the collector portion 58 and is connected to the intake duct via the throttle chamber.

[0005]

As described above, in the conventional intake manifold-integrated rocker cover in which the entire collector portion 58 is integrated, when it is used in an internal combustion engine corresponding to many vehicle types and specifications, For example, the direction in which the throttle chamber should be attached differs depending on whether it is applied to an FR (front engine rear drive) type vehicle or an FF (front engine front drive) type vehicle.
The overall shape of the intake manifold integrated rocker cover must be changed. That is, many types of intake manifold-integrated rocker covers must be manufactured for one internal combustion engine, and the intake manifold-integrated rocker cover is a large-sized component, which results in a cost increase.

Further, in terms of weight and cost, it is desirable that the intake manifold-integrated rocker cover is made of a synthetic resin molded product rather than a metal cast product.
In the case of performing R), there is a problem that it is generally difficult to secure heat resistance to the EGR gas passage provided in the collector portion 58.

[0007]

An intake manifold integrated rocker cover for an internal combustion engine according to the present invention is a cover attached to an upper surface of a cylinder head having an intake port and an exhaust port in a cross flow type so as to cover the cylinder head. Section, a plurality of branch sections integrally formed on the upper portion of the cover section so as to cross from the intake side to the exhaust side of the cylinder head, and one end of which is connected to the intake port, and the branch section. An intake manifold integrated rocker cover of an internal combustion engine, comprising: a collector part that is connected to the other end part of the collector cylinder and that is elongated in the cylinder row direction; and a collector part that includes a connection part with each branch part. 1 part and a second part including the mounting flange of the throttle chamber
The first portion is integrally formed with the branch portion and the cover portion, and the second portion is joined to the first portion.

In the invention of claim 2, the second portion and the first portion are joined and fixed so as not to be disassembled.

According to the third aspect of the invention, the second portion and the first portion are assembled so as to be disassembled.

According to a fourth aspect of the present invention, the first portion, the branch portion and the cover portion are integrally molded of synthetic resin, and the second portion is formed of a metal material. An EGR valve mounting part having an EGR gas passage,
It is characterized in that it is arranged in the second portion.

[0011]

In the above structure, a part of the collector portion, that is, the second portion including the mounting flange of the throttle chamber is formed separately from the main body portion of the intake manifold integrated rocker cover. The collector portion is formed by coupling to the portion 1. Therefore, when the mounting direction of the throttle chamber is different due to the specifications of the internal combustion engine or the like, it can be dealt with by changing the shape of the second portion.

[0012] The second portion may be joined and fixed so as not to be disassembled by adhesion or welding, or may be assembled so as to be disassembled with bolts or the like.

Further, in the present invention, since the EGR valve mounting portion is provided in the second portion made of a metal material,
Heat resistance is secured.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a plan view showing an intake manifold-integrated rocker cover 1 according to the present invention with a part cut away. In the figure, 2 indicates a cylinder head mounted and fixed on the upper surface of a cylinder block (not shown). The cylinder head 2 is integrally cast from, for example, an aluminum alloy, and has an intake port 3 opened and closed by an intake valve (not shown) and an exhaust port opened and closed by an exhaust valve (not shown). Ports (not shown) are formed in a cross flow format. Incidentally, 4 is an intake side camshaft, and 5 is an exhaust side camshaft. Also,
A spark plug attachment portion 6 is provided at the center of each cylinder.

The upstream side portion of the intake port 3 has a shape that is curved and rises upward, and its tip is open in the same plane as the flange surface 7 at the upper end of the cylinder head 2. The flange surface 7 is formed so as to pass through the centers of the intake side camshaft 4 and the exhaust side camshaft 5 and to be parallel to the lower surface of the cylinder head 2. Further, fuel injection valves (not shown) are provided outside the upwardly curved intake ports 3, respectively.

The rocker cover 1 attached to the upper surface of the cylinder head 2 includes a cover portion 11 that covers an upper surface opening of the cylinder head 2 to define a valve operating chamber, and a plurality of branch portions 12 that form an intake manifold. Similarly, the collector portion 13 which is also a part of the intake manifold is integrally formed with each other. The cover portion 11 is in the form of a shallow box having side walls on four sides, and the flange surface at the tip of the side wall is in close contact with the flange surface 7 on the outer periphery of the cylinder head 2 via a gasket (not shown). . In addition,
In this embodiment, inside the cover portion 11, cam bearing portions corresponding to the cam bearing portions 10 on the cylinder head 2 side are formed in a partition shape, and a semicircular bearing surface formed on the cam bearing portion. The intake-side and exhaust-side camshafts 4, 5 are supported between and the semicircular bearing surface on the cylinder head 2 side.

The cover portion 11 is fixed to the cylinder head 2 by a plurality of bolts 23 at the outer peripheral portion thereof. Further, a pair of bolts 24 are provided on both sides of the cam shafts 4 and 5 so as to penetrate the cam bearing portions, and the cover portion 11 is fixed and the cam bearing portions are firmly coupled to each other. . Incidentally, the cam bearing portion may not be formed integrally with the rocker cover 1, but the cam shafts 4 and 5 may be supported by using a cam bracket formed of a separate member.

The plurality of branch portions 12 are formed so as to traverse from the intake side to the exhaust side of the cylinder head 2 substantially along the width direction of the rocker cover 1 (direction orthogonal to the crankshaft axial direction). . This branch 1
2 has a shape in which a part of the lower surface thereof shares the wall portion of the cover portion 11. Further, the branch portions 12 of adjacent cylinders are formed in a separated shape as shown in FIG. 1, and a recess is formed between the branch portions 12 when viewed from the outside. The tip of each branch portion 12 on the intake side is curved downward by approximately 90 ° along the side wall of the cover portion 11 on the intake side, and opens on the same flange surface as the peripheral edge of the cover portion 11. . The opening at the tip of the intake side of each branch 12 is connected to the tip of the intake port 3 on the cylinder head 2 side. The periphery of this connecting portion is sealed by a gasket (not shown).

The collector portion 13 is in the form of an elongated passage along the front-back direction of the cover portion 11 (axial direction of the crankshaft) and is formed over substantially the entire length of the cover portion 11. The collector portion 13 is configured in such a manner that a part of the side wall and the wall portion of the cover portion 11 on the exhaust side are shared.
Then, on the side surface of the collector portion 13, each branch portion 1
The base ends of the two, that is, the tips on the exhaust side are connected. Further, the collector portion 13 is formed outside the side wall of the cover portion 11 on the exhaust side, and therefore is in a state of protruding laterally from the side surface of the cylinder head 2 on the exhaust side and overhanging.

Here, the collector portion 13 is divided into a first portion, that is, a collector base portion 13A and a second portion, that is, a collector cover portion 13B, with a dividing surface 14 that is substantially vertical along the axial direction of the crankshaft as a boundary. It is divided and formed in advance.

The collector base portion 13A has a semi-cylindrical shape and includes a connecting portion with each branch portion 12. That is, the collector base portion 13A is formed integrally with the branch portion 12 and the cover portion 11.

The collector cover portion 13B combined with the collector base portion 13A also has a semi-cylindrical shape,
Further, one end thereof is formed to extend in a cylindrical shape, and a mounting flange 15 for the throttle chamber is integrally formed at the tip of this cylindrical portion. Further, the EGR valve mounting portion 1 is provided on the side surface of the collector cover portion 13B.
6 is integrally formed, and an EGR valve 17 that controls exhaust gas recirculation is attached to the unit 6. Above EGR
The valve mounting portion 16 has a collector portion 1 at the center of its seating surface.
An EGR gas passage (not shown) that communicates with the inside of 3 is formed with an opening, and the recirculation exhaust gas is introduced through the passage. Further, an AAC valve 18 and a FICD valve 19 for controlling bypass air introduced into the collector portion 13 by bypassing the throttle valve are attached to the side surface of the collector cover portion 13B.

The collector base portion 13A is integrally formed with the cover portion 11 and the branch portion 12 by casting using an aluminum alloy or injection molding using a synthetic resin. Similarly, the collector cover part 1
3B is also integrally formed by casting using an aluminum alloy or the like, or injection molding using a synthetic resin. Then, the collector base portion 13A and the collector cover portion 13
B is integrally connected in a non-decomposable state by welding or adhesion.

Here, if both the collector base portion 13A and the collector cover portion 13B are synthetic resin molded products, it is advantageous in terms of weight reduction and manufacturing cost. Further, if each of them is a metal product, it is advantageous in strength, rigidity and heat resistance. Further, if the collector base portion 13A side is made of a synthetic resin molded product and the collector cover portion 13B side is made of metal, EG while reducing the weight of the entire rocker cover 1
This is advantageous in that the heat resistance to R gas and the mounting strength of the EGR valve 17 and the like can be sufficiently secured.

As described above, if the collector cover portion 13B including the part of the collector portion 13, that is, the mounting flange 15 is configured as a separate member, when the internal combustion engine has a plurality of specifications, only the collector cover portion 13B is provided. It will be enough if you prepare more than one. FIG. 2 shows an example of collector cover parts 13B having different specifications.
The three types are compared and shown. Specification A and Specification B
Indicates that the collector portion 13 has a different capacitance, and the specification B has a relatively small capacitance and is small in size. Further, in the specification C, the direction of the mounting flange 15 is set to be opposite to that of the specification A. As described above, by preparing various collector cover portions 13B and selectively combining them with the collector base portion 13A, it is possible to cope with, for example, the layout in the engine room of an automobile.

The collector cover portion 13B is a small component and can be easily cast or molded. Further, at the time of initial molding, the side surface of the collector base portion 13A to which the plurality of branch portions 12 are connected is in an open state. Therefore, when the collector base portion 13A side is cast or integrally molded, its manufacture is also easy. Become.

Next, FIG. 3 shows a collector cover portion 13B.
Shows an embodiment in which is attached to the collector base portion 13A so as to be disassembled. In this example, the stud bolts 21 are provided at appropriate intervals on the opening flange portion 20 of the collector base portion 13A along the dividing surface 14 of the collector portion 13.
Is fixed, and the collector cover 13B is fixed by a nut 22 screwed to the stud bolt 21.

According to this structure, the collector cover portion 13B selected according to the specifications can be easily joined in a post process. In addition, as described above, the collector base portion 1
Even when the 3A side is a resin molded product and the collector cover 13B is made of metal, both can be fixed easily and reliably.

[0030]

As is apparent from the above description, in the intake manifold integrated rocker cover of the internal combustion engine according to the present invention, a part of the collector portion, that is, the second portion including the throttle chamber mounting flange is separately provided in advance. The intake manifold integrated rocker cover, which is a large component, is installed when the throttle chamber is installed in different directions depending on the specifications of the internal combustion engine. It is not necessary to integrally form the whole into another shape, and it is possible to deal with it by preparing various second portions.

According to a fourth aspect of the present invention, the EGR valve mounting portion is provided on the second portion made of a metal material, and the main body portion of the intake manifold integrated rocker cover including the first portion is made of synthetic resin. As a result, it is possible to secure heat resistance to EGR gas while achieving overall weight reduction.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view showing a rocker cover according to the present invention.

FIG. 2 is an explanatory diagram showing an example of different specifications of a collector cover section.

FIG. 3 is a plan view showing an embodiment in which a collector cover part is disassembled and assembled.

FIG. 4 is a sectional view showing an example of a conventional intake manifold-integrated rocker cover.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Rocker cover 11 ... Cover part 12 ... Branch part 13 ... Collector part 13A ... Collector base part 13B ... Collector cover part 15 ... Throttle chamber mounting flange 16 ... EGR valve mounting part

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display area F02M 35/10 301T 301P

Claims (4)

[Claims] 1. A cover part which is attached to an upper surface of a cylinder head having an intake port and an exhaust port in a cross-flow type and covers the cylinder head, and an upper part of the cover part from an intake side to an exhaust side of the cylinder head. A plurality of branch portions that are integrally formed so as to traverse to one end and one end of which is connected to the intake port, and a collector portion that is connected to the other end of the branch portions and that is elongated along the cylinder column direction. An intake manifold integrated rocker cover for an internal combustion engine, comprising: a first part including a connecting part for connecting the collector part to each branch part.
And a second part including a mounting flange of the throttle chamber, the first part is integrally formed with the branch part and the cover part, and
A rocker cover integrated with an intake manifold for an internal combustion engine, characterized in that the second part is connected to the first part. 2. The second portion and the first portion are
The intake manifold integrated rocker cover for an internal combustion engine according to claim 1, wherein the rocker cover is joined and fixed so as not to be disassembled. 3. The second portion and the first portion are
The intake manifold integrated rocker cover for an internal combustion engine according to claim 1, wherein the rocker cover is assembled so as to be disassembled. 4. The first portion, the branch portion, and the cover portion are integrally molded of synthetic resin, and
The internal combustion engine according to any one of claims 1 to 3, wherein the second portion is formed of a metal material, and an EGR valve mounting portion having an EGR gas passage is arranged in the second portion. Rocker cover integrated with intake manifold of engine.