JPH051856U - Engine intake system - Google Patents

Abstract

(57) [Summary] [Purpose] Properly arrange the intake system passage and the pressure regulator to ensure the protection of the pressure regulator without compromising the compactness of the engine. An injector 9 is fixed to each downstream end of each of the first to fourth independent intake passages 21 to 24. The upstream end 6a of the surge tank 6 extending in the cylinder row direction is arranged above the cylinder head 4 above the downstream end of the second independent intake passage 22 in the cylinder row direction, and the common intake passage 8 extending from the upstream end 6a is arranged. A case 12 with a built-in throttle valve is arranged on the upstream end flange 8a. The case 12 is connected to one end of a cylinder row from a pressure regulator 11 provided at a downstream end 10a of a fuel distribution pipe 10 for distributing and supplying fuel to each injector 9. It is fixed to the rocker cover 7, which is the engine body side, with the position projecting to the side.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an intake system for an engine, and more particularly to a layout of an intake system passage and a fuel system component that supplies fuel to the intake system passage.

[0002]

[Prior Art]

 Generally, in an engine equipped with a plurality of injectors that respectively inject fuel into the independent intake passages for each cylinder, the fuel injection amount from each injector is placed at the downstream end of the fuel distribution pipe that distributes fuel to each injector. Is equipped with a pressure regulator for adjusting the fuel supply pressure so that it becomes appropriate according to the operating conditions. Further, as disclosed in, for example, Japanese Patent Application Laid-Open No. 2-27118, each independent intake passage is curved, and an injector is arranged at the downstream end portion inside the curved portion of each independent intake passage. It may be surrounded by a corresponding independent air intake passage so that the injector can be protected by the independent air intake passage in the event of a vehicle collision.

[0003]

[Problems to be solved by the device]

 However, since the pressure regulator is provided at the downstream end portion of the fuel distribution pipe, that is, at one end side in the cylinder row direction, it projects outside the one end side in the cylinder row direction of the independent intake passage, and the injector As described above, it is difficult to protect the surrounding area with only the independent intake passage. For this reason, in the case where the output shaft of the engine is arranged vertically with the front-rear direction of the vehicle, the pressure regulator is usually used as a protective measure in the event of a vehicle collision. The pressure regulator is placed on the vehicle rear side of the engine, which does not move much relative to the vehicle body side, to prevent the pressure regulator from hitting the vehicle body side member and being damaged. However, due to the layout of the engine, the pressure regulator may have to be arranged on the front side of the engine in the vehicle front-rear direction. In this case, in the case of a vehicle collision, especially in the case of a frontal collision, the relative movement of the engine and the vehicle body on the front side of the vehicle will be large, and the pressure regulator will collide with the front member of the vehicle and be damaged. Will be done. As a protective measure against this, it is conceivable to provide a protective member on the front side of the above pressure regulator, but in that case, a protective member that is sufficiently rigid to withstand the impact at the time of a collision is required, and a large protective member is required. In addition, it is apt to be heavy and difficult to mount due to space restrictions, and there is a problem that it hinders weight reduction and size reduction of the engine. It is also conceivable to shift the above pressure regulator to the side on the front side of the engine so that it is protected by other parts on the engine side, but in this case, the fuel distribution pipe becomes long and the layout becomes complicated. Moreover, since the rigidity of the fuel distribution pipe is reduced, the pressure regulator cannot be supported only by the fuel distribution pipe, and a support member for supporting the pressure regulator is needed, which hinders the compactness of the engine. Such a problem occurs.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an intake passage and a pressure regulator in an engine in which an injector is provided in each independent intake passage of each cylinder. The proper arrangement is to ensure the protection of the pressure regulator without compromising the compactness of the engine.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the solution means taken by the present invention is an engine in which injectors for injecting fuel into the independent intake passages are fixed to the downstream end of the independent intake passages independent for each cylinder. Assuming an intake device. Then, the upstream end of the surge tank extending in the cylinder row direction above the cylinder head is arranged at the other end of the cylinder row from the position of the downstream end portion of the independent intake passage of the cylinder on the one end side of the cylinder row. A case with a built-in throttle valve is arranged in the intake passage to be connected, and the case is arranged close to one end of the cylinder row of the injector fixed to the independent intake passage of the cylinder on the one end side of the cylinder row and the engine body. Fixed to the side. Further, a pressure regulator for adjusting the fuel supply pressure is provided at the downstream end of the fuel distribution pipe extending in the cylinder row direction for distributing and supplying the fuel to each injector, and the pressure regulator is provided below the case. It is arranged to be arranged on the other end side of the row.

[0006]

[Action]

 With the above structure, in the present invention, the case with a built-in throttle valve disposed in the intake passage on the upstream end side of the surge tank is connected to one end of the cylinder row of the injector fixed to the independent intake passage of the cylinder on the one end side of the cylinder row. Since the pressure regulator, which is placed in close proximity and is provided at the downstream end of the fuel distribution pipe, is placed on the other end side of the cylinder row below the above case, at the one end side of the cylinder row of the engine, a case with a built-in throttle valve is installed. Will protrude from the pressure regulator toward one end of the cylinder row. Furthermore, the throttle valve built-in case has a relatively high rigidity because it has a built-in throttle valve and allows its operation to be performed smoothly, and is fixed to the engine body side. When a vehicle collision occurs, the relative position between the engine and the vehicle body moves at one end of the cylinder row of the engine, and if the one end of the engine collides with the member on the vehicle body, the pressure regulator is activated. The colliding body-side member first collides with the throttle valve built-in case to prevent collision with the pressure regulator and prevent damage to the pressure regulator due to collision. In other words, the case with a built-in throttle valve functions as a protective member for the pressure regulator. Therefore, the pressure regulator can be reliably protected by the case with the built-in throttle valve in the event of a vehicle collision, even if a separate protective member is not provided.

Further, the pressure regulator is arranged close to one end side of the cylinder row of the injector fixed to the independent intake passage of the cylinder on the one end side of the cylinder row, and the fuel distribution pipe is The length of the portion connecting the injector and the pressure regulator on the downstream end side can be shortened, the rigidity of the pressure regulator mounting portion can be improved, and the compactness of the fuel supply system can be maintained.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show an intake system for an engine according to an embodiment in which the present invention is applied to an in-line 4-cylinder engine. In these figures, 1 is an intake manifold that supplies intake air to each of the four cylinders of the engine. The intake manifold 1 is divided into a downstream intake manifold 2 and an upstream intake manifold 3. , The downstream side intake manifold 2 is attached to four intake ports 5, 5, ... Opened on the side surface of the cylinder head 4, and the upstream side intake manifold 3 is connected to a surge tank 6 having a predetermined volume on the upstream side. Has been done. Specifically, the downstream intake manifold 2 has independent first to fourth independent intake passages 21 to 24 connected to the intake ports 5, 5, ... Of the four cylinders of the engine, respectively. The downstream side intake manifold 2 is attached to the side surface of the cylinder head 4 by an attachment flange 25 formed at the downstream ends of the first to fourth independent intake passages 21 to 24. The upstream side of each of the first to fourth independent air suction passages 21 to 24 is curved upward of the cylinder head 4, and a mating surface flange 26 is formed at the upstream end thereof. The upstream intake manifold 3 has first to fourth independent intake passages 31 to 34 corresponding to the first to fourth independent intake passages 21 to 24 of the downstream intake manifold 2, respectively. The mating surface flange 35 formed at the downstream end of each of the first to fourth independent intake passages 31 to 34 of the upstream intake manifold 3 is joined to the mating surface flange 26 of the downstream intake manifold 2. The first to fourth independent intake passages 31 to 34 of the upstream intake manifold 3 and the first to fourth independent intake passages 21 to 24 of the downstream intake manifold 2 communicate with each other. The upstream side of the first to fourth independent intake passages 31 to 34 of the upstream intake manifold 3 is curved toward the cylinder head 4 side, and each independent intake passage of the intake manifold 1 is generally U-shaped. It is shaped like a curve. This engine is mounted vertically in the vehicle with the first independent intake passages 21 and 31 being the front side of the vehicle.

The upstream ends of the first to fourth independent intake passages 31 to 34 of the upstream intake manifold 3 are connected to surge tanks 6 each having a predetermined volume and extending in the cylinder column direction. There is. The surge tank 6 is arranged above the rocker cover 7 arranged on the upper surface of the cylinder head 4, and one end side of the cylinder row (the first independent intake passage 31 side) serves as the upstream end portion 6a. The downstream side of the common intake passage 8 is connected to the upstream end 6a. The common intake passage 8 extends obliquely from the upstream end 6a of the surge tank 6 toward one end of the cylinder row toward the mounting side of the intake manifold 1 of the cylinder head 4, and the throttle valve is provided at the upstream end thereof. A flange 8a for mounting a built-in case is formed, and a case 12 with a built-in throttle valve is mounted. The case 12 with a built-in throttle valve is provided with a throttle valve (not shown) for adjusting the amount of air flowing through the intake passage, and has a high rigidity so that the throttle valve operates smoothly. Has been formed. Further, the throttle valve built-in case 12 is fixed to a mounting boss 7a on the upper surface of the rocker cover 7 on the engine body side by a mounting portion 7a provided in the lower portion. The upstream intake manifold 3, surge tank 6 and common intake passage 8 are integrally formed.

The first to fourth independent intake passages are provided on the upper side of each downstream end of the first to fourth independent intake passages 21 to 24 of the downstream side intake manifold 2, that is, on the curved inner side curved in a U shape. Injectors 9 for injecting and supplying fuel into 21 to 24 are fixed. Each injector 9 is of a side-feed type, and a fuel distribution pipe 10 for distributing fuel to each injector 9 is fixed and communicated with each of the injectors 9 at a midway portion thereof and extends straight in the cylinder row direction. The fuel distribution pipe 10 distributes the fuel to the injectors 9 by distributing the fuel from the other end of the cylinder array (the fourth independent intake passage 24 side) to the one end of the cylinder array (the first independent intake passage 21 side). We are supplying. The fuel distribution pipe 10 forms a downstream end 10a immediately downstream of the injector 9 fixed to the most downstream first independent intake passage 21, and the downstream end 10a has the above-mentioned structure. A pressure regulator 11 for adjusting the supply pressure of the fuel in the fuel distribution pipe 10 is fixed. The pressure regulator 11 adjusts the fuel supply pressure according to the intake negative pressure so that the differential pressure between the intake negative pressure and the injection pressure injected and supplied from the injector 9 in each operating state is kept constant. The fuel flowed out for pressure regulation is returned to the fuel tank side from the return passage 11a.

Next, the arrangement of the pressure regulator 11 and each part of the intake system passage will be described. The upstream end 6a of the surge tank 6 is located at the other end of the cylinder row (the first end of the cylinder row) with respect to the connecting portion with the cylinder head 4 which is the downstream end of the first independent intake passage 21 of the downstream intake manifold 2 in the cylinder row direction. 4 independent intake passage 24 side) is located above the downstream end of the second independent intake passage 22. Further, the upstream end flange 8a of the common intake passage 8 that extends obliquely from the upstream end 6a of the surge tank 6 toward the one end of the cylinder row toward the mounting side of the intake manifold 1 of the cylinder head 4 has the above-mentioned downstream intake air. The injector 9 fixed to the downstream end portion of the first independent intake passage 21 of the manifold 2 is located above a position close to one end side of the air cylinder row. That is, it is located above the pressure regulator 11 fixed to the downstream end 10a of the fuel distribution pipe 10. The throttle valve built-in case 12 connected to the upstream end flange 8a of the common intake passage 8 is located at a position protruding from the pressure regulator 11 toward one end of the cylinder row.

With the above-described configuration, in the above-described embodiment, the pressure regulator 11 is located on the one end side of the cylinder bank and below the casing 12 with a high rigidity, which is fixed to the engine body side, and is close to the other end side of the cylinder bank. In other words, the case 12 with the built-in throttle valve protrudes from the pressure regulator 11 toward one end of the cylinder row, so that when the vehicle collides, particularly in the case of a frontal collision, the engine and the vehicle body side are located at one end of the cylinder row of the engine. When one of the cylinder row ends of the engine, that is, the front side, collides with a front member of the vehicle body (for example, a radiator, etc.) due to the movement of the position relative to the front side of the vehicle body that collides with the pressure regulator 11 at the one end side of the cylinder row. The member is stored in the throttle valve that protrudes from the pressure regulator 11 to the one end side of the cylinder row. When the case 12 collides with the case 12, the case 12 with the built-in throttle valve prevents the collision with the pressure regulator 11, and the damage of the pressure regulator 11 due to the collision is prevented. Therefore, the pressure regulator 11 can be reliably protected by the throttle valve built-in case 12 in the event of a vehicle collision without providing a separate protective member.

Further, since the fuel distribution pipe 10 forms the downstream end portion 10a immediately downstream of the injector 9 fixed to the most downstream first independent intake passage 21, the downstream end portion 10a is formed. The portion between the injector 9 and the downstream end 10a can be shortened. Therefore, the rigidity on the downstream end side of the fuel distribution pipe 10 can be improved, and the pressure regulator 11 fixed to the downstream end portion 10a can be reliably supported without being supported by another supporting member, and at the same time, the fuel can be supported. The compactness of the system can be maintained.

The upstream end portion 6 a of the surge tank 6 is located above the downstream end portion of the second independent intake passage 22 of the downstream intake manifold 2 in the cylinder row direction, and is located at the downstream end of the first independent intake passage 21. Since it is located on the other end side of the cylinder row (on the side of the fourth independent intake passage 24) with respect to the section, the common passage 8 and the throttle valve built-in case 12 on the upstream side do not project largely from the engine body to the one end side of the cylinder row The compactness of the intake system can be maintained.

Further, since the pressure regulator 11 is located below the relatively large throttle valve case 12, the pressure regulator 11 and the pipes connected to it are opened in the engine room by opening the bonnet. When it is seen, it can be hidden under the throttle valve built-in case 12 to improve the appearance around the engine.

In the above embodiment, the present invention is applied to a vehicle in which the engine is installed vertically, but may be applied to a vehicle in which the engine is installed horizontally. In this case, it is effective against a collision from the side of the vehicle.

[0018]

[Effect of the device]

 As described above, according to the intake system for an engine of the present invention, the highly rigid throttle valve housing case fixed to the engine body side is located on the one end side of the cylinder column of the engine, on the one end side of the cylinder column of the engine. When the vehicle collides, the relative position of the engine and the vehicle body side is moved at one end of the engine cylinder row, and the one end of the engine cylinder row collides with the member on the vehicle body side. In this case, the body side member that hits the pressure regulator first hits the case with the built-in throttle valve to prevent collision with the pressure regulator, preventing damage to the pressure regulator due to the collision, that is, the case with built-in throttle valve. Functions as a protective member that protects the pressure regulator. Therefore, the pressure regulator can be reliably protected by the case with the built-in throttle valve at the time of a vehicle collision without providing a separate protective member.

Further, since the pressure regulator is arranged close to one end of the cylinder row of the injector fixed to the independent intake passage of the cylinder on the one end side of the cylinder row, the fuel distribution pipe is located downstream of the injector. The length of the part that connects the injector and the pressure regulator on the end side can be shortened, the rigidity of the pressure regulator mounting part is improved to improve the reliability of the pressure regulator mounting, and the compactness of the fuel supply system is improved. Can be maintained.

[Brief description of drawings]

FIG. 1 is a plan view of an intake manifold according to an embodiment of the present invention.

FIG. 2 is a front view of an intake manifold of the same.

FIG. 3 is a side view of the intake manifold of the same.

[Explanation of symbols]

 1 Intake Manifold 4 Cylinder Head 6 Surge Tank 9 Injector 10 Fuel Distribution Pipe 11 Pressure Regulator 12 Throttle Valve Built-in Case 21-24 First to Fourth Independent Intake Passages 31 to 34 First to Fourth Independent Intake Passages

Claims (1)

Claims for utility model registration: 1. In an intake system for an engine, wherein an injector for injecting fuel into each independent intake passage is fixed to a downstream end of the independent intake passage for each cylinder. An upstream end of a surge tank extending in the cylinder row direction above the cylinder head is arranged on the other end side of the cylinder row from the position of the downstream end portion of the independent intake passage of the cylinder on one end side of the cylinder row, and is connected to the upstream end of the surge tank. A case with a built-in throttle valve is arranged in the intake passage, and the case is arranged close to one end of the cylinder row of the injector fixed to the independent intake passage of the cylinder on the one end side of the cylinder row and on the engine body side. A pressure regulator that is fixed and that adjusts the fuel supply pressure is provided at the downstream end of the fuel distribution pipe that extends in the cylinder row direction and that distributes fuel to the injectors. Vignetting,
An intake device for an engine, wherein the pressure regulator is arranged on the other end side of the cylinder row below the case.