JPH07103092A - Structure of engine - Google Patents

Abstract

PURPOSE:To secure a smooth intake air flow and to protect a fuel system by bending an intake manifold to connect a surge tank with an intake port outward, and arrangedly providing a fuel system in a space formed of the above parts. CONSTITUTION:The end on a downstream side of an intake manifold 4b on a downstream side is connected to the outside open part of an intake port 3 arrangedly provided inside a cylinder head 2, and the end on a downstream side of an intake manifold 4a on an upstream side is connected to the end on an upstream side of the intake manifold 4b. An intake manifold surge tank 5 is connected to the end on an upstream side of the intake manifold 4a on the upstream side. On the other hand, a fuel system composed of a fuel injection valve 8, a delivery valve 9 and fuel piping 10 is arrangedly provided in the inside of a space formed of a cylinder block 1, the cylinder head 2 and the intake manifold surge tank 5. Thus a smooth intake air flow can be secured, and the fuel system can be protected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an automobile engine,
In particular, the present invention relates to a structure of an engine which is disposed horizontally in an engine room provided in front of a vehicle compartment so that a crank axis line is perpendicular to a longitudinal axis line of a vehicle.

[0002]

2. Description of the Related Art In recent years, engines for automobiles are often arranged horizontally in an engine room provided in the front of a vehicle compartment such that the crank axis is perpendicular to the longitudinal axis of the vehicle. This is because the length of the engine room in the front-rear direction is made as short as possible, the overall length is made compact, and the volume of the vehicle compartment is made as large as possible to achieve both economy and comfort. By the way, when an automobile having an engine room provided in front of the vehicle compartment has a frontal collision, the fuel system should be most protected. Therefore, in the engine arranged horizontally as described above, the fuel system is used. It is common to arrange the exhaust system on the front side of the engine main body and the intake system on the rear side of the engine main body so as to come to the rear side of the engine. However, if the exhaust system and the intake system are arranged in this way, the intake and exhaust handling becomes complicated,
As for the exhaust system, it is necessary to reverse the gas that has been exhausted toward the front side and bring it back to the rear side, so that the length of the exhaust pipe must be increased until it reaches the catalyst in the case with a catalyst. In addition, the gas temperature may be too low and the reaction of the catalyst may be lowered, which may cause a problem. Therefore, recently, a horizontally mounted engine has been developed in which the intake system is on the front side and the exhaust system is on the rear side. For example, according to Japanese Patent Laid-Open No. 4-276172, the engine is mounted horizontally on the vehicle body. In the engine described above, the surge tank of the intake system is arranged at a position on the front side of the vehicle body close to the skirt portion of the engine block, and the intake pipe downstream of the surge tank is bent upward and connected to the cylinder head, An engine in which an exhaust pipe is connected to the cylinder head from the rear is disclosed (see FIG. 2). Further, in the 2.8-liter V-type 6-cylinder engine of VW (Volkswagen) Co., which is introduced in German MTZ magazine No. 52 (1991), a surge tank is provided above the cylinder head. A downstream intake pipe is bent forward and downward of the engine to be connected to a cylinder head, and a fuel system is arranged in a space formed inside the intake pipe downstream of the surge tank (see FIG. 3).

[0003]

However, in the engine according to Japanese Patent Laid-Open No. 4-276172, the fuel system is disposed diagonally above and forward of the engine without being protected by a strong structure. Therefore, when a collision occurs in the front of the vehicle, the fuel system may be damaged when the bonnet 20 above the engine room is deformed downward, and a bending force acts on the mounting portion of the surge tank 5. However, a force in the shearing direction may act on the mounting portion between the downstream end of the downstream intake manifold 4b and the intake port, and even if the downstream intake manifold 4b shifts to the rear side, the fuel system is Can be damaged. Further, in the engine introduced in the MTZ magazine, the fuel system is arranged inside the intake manifold 4 as in the present invention, but the mounting of the intake manifold 4 on the upstream side of the engine body causes a force at the time of collision. Is a direction perpendicular to the direction of action of and the shearing force acts, and the intake manifold 4 may be displaced rearward.
In that case, the fuel system may be damaged. Further, since the surge tank 5 is arranged above the cylinder head 2, there is a drawback that the height of the entire engine is increased, and the surge tank 5 is arranged above the cylinder head 2 in the height direction from the surge tank 5 to the cylinder head 2. The intake manifold 4 must be bent toward the intake port in the middle part of the intake manifold 4, and the curvature of the intake manifold 4 is steep, which makes it difficult to obtain a smooth air flow that is preferable in terms of air intake efficiency. In view of the above problems, it is an object of the present invention to provide an engine in which an intake system is arranged so that a fuel system can be protected and a smooth intake flow can be obtained.

[0004]

According to the present invention, the surge tank for the intake system is arranged on the side surface of the cylinder block on the same side as the intake port, and the intake manifold connecting the surge tank and the intake port is provided outside the engine. Is arranged so as to be convex to the inside, and in the space formed by the surge tank of the intake system, the intake manifold, the cylinder head, and the cylinder block, one of the fuel system such as a fuel injection valve, a delivery pipe, and a fuel pipe is installed. An engine is provided that has parts arranged. Also, the surge tank can be attached to the cylinder block via an oil filter bracket.

[0005]

The function of the surge tank and the intake manifold is almost unchanged even when a collision occurs on the front surface of the vehicle body to protect the fuel system arranged therein, and the intake air is smooth without being suddenly bent from the surge tank. It is bent into and is efficiently introduced into the suction port. If the surge tank is attached to the cylinder block via the oil filter bracket, the support rigidity of the surge tank can be improved without newly providing a stay.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of an engine according to the present invention as seen from the direction of the crankshaft axis, where 1 is a cylinder block and 2 is a cylinder head. Reference numeral 3 denotes an intake port arranged inside the cylinder head 2, and a downstream side end portion of a downstream side intake manifold 4b is attached to an outer opening portion thereof by means not shown. The downstream end of the upstream intake manifold 4a is joined to the upstream end of the downstream intake manifold 4b by means not shown. Upstream intake manifold 4
At the upstream end of a, the upstream intake manifold 4
An intake manifold surge tank 5 formed integrally with a is provided. The intake manifold surge tank 5 has a flange portion 5a, and the flange portion 5a of the intake manifold surge tank 5 is attached to a bracket 6. Here, the bracket 6 is firmly fixed to the boss portion 1a of the cylinder block 1 by means not shown, and the oil cleaner 7 is attached in addition to the flange portion 5a of the intake manifold surge tank 5. Actually, it is a product made only for mounting the oil cleaner 7 to be remodeled so as to share the parts. 8 is a fuel injection valve, 9 is a delivery pipe for distributing fuel to the fuel injection valve, 1
Reference numeral 0 is a fuel pipe from the fuel pump, and as shown in the drawing, a cylinder block 1, a cylinder head 2, an intake manifold surge tank 5 and a flange portion 5 thereof.
a, the upstream intake manifold 4a, and the downstream intake manifold 4b. Further, 11 is an exhaust port, and 12 is an exhaust manifold.

The intake manifold surge tank 5 integrated with the upstream intake manifold 4a itself has high rigidity, and one end thereof is firmly fixed to the highly rigid cylinder block 1 by the flange portion 5a. At the same time, the other end is connected to the highly rigid cylinder head via the downstream intake manifold 4b.
Since they are attached from the front side of the vehicle respectively, even when a collision occurs on the front of the vehicle body, the force acting on the attachment portion is mainly in the compression direction and hardly deforms by itself. 1, a cylinder head 2, an intake manifold surge tank 5 and its flange portion 5a, an upstream intake manifold 4
a, the fuel injection valve 8 arranged in the space formed by the downstream intake manifold 4b, the delivery pipe 9 for distributing fuel to the fuel injection valve, and the fuel pipe 10 from the fuel pump may be damaged. The sex is extremely low.

[0008]

Since the present invention is constructed and operates as described above, the intake manifold surge tank 5 and its flange portion 5a, even when a collision occurs on the front surface of the vehicle body,
The upstream intake manifold 4a and the downstream intake manifold 4b protect the fuel injection valve 8, the delivery pipe 9 for distributing fuel to the fuel injection valve, and the fuel pipe 10 from the fuel pump, and the possibility of damage is extremely low. Further, since the surge tank 5 is not disposed above the cylinder head 2 but is disposed laterally of the cylinder block, it is not necessary to increase the height of the engine as a whole and the intake from the surge tank 5 is eliminated. Since it is not necessary to bend the intake manifold sharply toward the port, it is possible to introduce air into the intake port without reducing intake efficiency.

[Brief description of drawings]

FIG. 1 is a sectional view showing the structure of an embodiment of the present invention.

FIG. 2 is a diagram schematically showing the structure of an embodiment according to the prior art.

FIG. 3 is a diagram schematically showing the structure of an embodiment according to the prior art.

[Explanation of symbols]

 1 ... Cylinder block 2 ... Cylinder head 3 ... Intake port 4a ... Upstream intake manifold 4b ... Downstream intake manifold 5 ... Intake manifold Surge tank 6 ... Bracket 7 ... Oil cleaner 8 ... Fuel injection valve 9 ... Delivery pipe 10 ... Fuel piping 11 ... Exhaust port 12 ... Exhaust manifold

Front Page Continuation (72) Inventor Yasushi Ito 1 Toyota Town, Toyota City, Aichi Prefecture, Toyota Motor Co., Ltd. (72) Inventor Akitoshi Tomoda, 1 Toyota Town, Toyota City, Aichi Toyota Motor Co., Ltd.

Claims (2)

[Claims] 1. A surge tank for an intake system is arranged on a side surface of a cylinder block on the same side as an intake port, and an intake manifold for connecting the surge tank and the intake port is arranged so as to be curved outward of the engine. An engine is characterized in that a fuel system is arranged in a space formed by the intake system surge tank, the intake manifold, the cylinder head, and the cylinder block. 2. The engine according to claim 1, wherein the surge tank is attached to the cylinder block via an oil filter bracket.