WO2010066183A1

WO2010066183A1 - Intake manifold assembly for dual-fuel automobile

Info

Publication number: WO2010066183A1
Application number: PCT/CN2009/075372
Authority: WO
Inventors: 宋金环; 金先扬
Original assignee: 上海华普汽车有限公司
Priority date: 2008-12-08
Filing date: 2009-12-07
Publication date: 2010-06-17
Also published as: CN101493058A; CN101493058B

Abstract

An intake manifold assembly for a dual-fuel automobile comprises an intake manifold (1) and a fuel rail assembly mounted on the intake manifold. Two fuel rail assemblies (2, 3) are mounted on the intake manifold. The ports of a fuel inlet pipe (4) and a fuel return pipe (5) of each fuel rail assembly are on the same side as the connecting ends of external soft tubes. The connecting ends of the first and second fuel rails are located at opposite ends of the intake manifold respectively. The intake manifold assembly is neatly arranged in the engine cabin, and the two types of fuel rail are clearly distinguished. The external soft tubes of the fuel rails can easily be distinguished and are conveniently arranged for disassembly and maintenance. The intake manifold assembly controls fuel injection accurately, and ensures the optimal performance of the engine.

Description

Intake manifold assembly for dual fuel vehicles

The present invention relates to an automotive part, and more particularly to an intake manifold assembly for use in a dual fuel vehicle. Background technique

With the development of industrial technology, automobiles have become an important means of transportation for people. At present, the main fuel of automobiles is gasoline, which is non-renewable fuel and pollutes the environment. New types of fuels are expected. Nowadays, the sources of fuel for automobile engines are beginning to diversify. Dual-fuel vehicles have been increasingly valued by people. Replacing scarce energy with superior energy and replacing traditional energy with new energy is the main research direction of automotive fuel. Dual-fuel vehicles have become the trend of future car development. Corresponding to the supply of dual fuels, as an intake manifold assembly directly connected to the engine, its structure must be modified accordingly. The intake manifold assembly is generally composed of an intake manifold and a fuel rail assembly located thereon, and an oil inlet on the intake manifold corresponds to an injection port on the oil rail assembly, thereby The design of the intake manifold is critical.

Now, for the intake manifold of a dual-fuel vehicle, there is a nozzle that uses an injection hole in the intake manifold cavity to connect the second fuel. This structure design is relatively simple, but because it is a single point injection, fuel consumption Large, fuel injection control is not accurate; there are also two rows of nozzle mounting holes, such as the Chinese patent application: "a dual fuel engine intake manifold (CN101131138)", directly above the intake manifold air passage, close A first fuel nozzle mounting step is integrally molded at the intake manifold flange, and the nozzle common rail mounting hole of the first fuel and the nozzle mounting hole of the first fuel are processed thereon, and the intake manifold air passage is additionally Next, a second fuel nozzle mounting step is integrally molded near the intake manifold flange, and a nozzle common rail mounting hole of the second fuel and a nozzle mounting hole of the second fuel are processed thereon. This structure is simple to realize the installation of two different fuel nozzle common rails and the design of two different fuel nozzle mounting hole positions, but this structure sets two fuel nozzles on the upper and lower sides of the intake air passage, which is easy to produce. The phenomenon that the fuel droplets flow backward, and the oil rails are not well arranged, the required space is large, the disassembly is inconvenient, and the external hose arrangement of the oil rail is also disordered, which is not convenient for maintenance. Disclosure of invention

The invention mainly provides a tidy arrangement in the engine compartment, the fuel rails of the two fuels are clearly arranged, the hoses externally connected to the oil rail are easy to distinguish, easy to disassemble and maintain, precisely control the injection and combustion of the two fuels, and ensure the most engine The intake manifold assembly with good performance output; solves the technical problems that the prior art has a large installation space, is difficult to disassemble and maintain, the hoses of the oil rail are difficult to distinguish, and the fuel injection cannot be accurately controlled.

The invention also provides an intake manifold assembly with short assembly working time, high work efficiency, convenient disassembly and assembly, and low cost; solving the technical problems of long assembly work time and low work efficiency existing in the prior art.

The above technical problem of the present invention is mainly solved by the following technical solution: an intake manifold assembly for a dual fuel automobile, comprising an intake manifold and a fuel rail assembly mounted on the intake manifold, Two sets of oil rail assemblies are installed on the intake manifold, and the ports of the oil inlet pipe and the oil return pipe on the same oil track assembly are located on the same side as the connection end of the external hose, and the connection end of the first set of oil rails The connection ends with the second set of oil rails are respectively located at both ends of the intake manifold. A fuel uses a set of fuel rails that separate the two fuels to make fuel injection control more accurate. The connecting ends of the two sets of oil rail assemblies are arranged at the two ends of the intake manifold, and The two fuel pipes of the car are arranged correspondingly, which is convenient for identifying the fuel flowing in the hose, which can be quickly assembled, replaced and maintained, and also facilitates the arrangement of the external hose of the oil rail assembly to improve space utilization.

Preferably, the intake manifold has two inlet and outlet oil ports above the intake air passage, and two oil rail fixing seats on the body of the intake manifold, the oil rail fixing seat There are two rows of front and rear mounting holes, and one oil rail assembly is fixed in each row of mounting holes, and the fuel injection ports on the front and rear oil rail assemblies respectively correspond to the oil inlets of the front and rear two rows. The oil inlets are arranged directly above the intake air passages and are arranged in front and rear. The direction of the injection is injected from the intake air passages of the intake air passages, and the two sets of injection holes do not interfere with each other. The accuracy of the spray control is improved, and the optimum performance output of the engine can be ensured under any fuel operating condition.

Preferably, the oil rail assembly is fixed with an "L"-shaped mounting seat, and the mounting seat comprises a connecting member and a fixing member, wherein the connecting member is connected with the oil rail body, and the fixing member and the oil on the intake manifold The rail fixing seat is connected by a screw, the oil rail fixing seat is a flat surface, and the mounting seat on the two sets of oil rail assemblies is relatively fixed on the intake manifold oil rail fixing seat by screws, and the fixing component is in the oil rail fixing seat Connected on the plane. The "L"-shaped mount has a simple structure and is easy to support. The two mounts are oppositely mounted, that is, the two "L" shapes form a bracket shape, which increases the distance between the two rows of fuel rails, facilitating the fuel rail. Installation and layout. The connecting part of the oil rail is connected with the oil rail body to enhance the firmness, and the fixing component is fixed on the oil rail fixing seat on the intake manifold by screws, and the installation is convenient.

Preferably, the angle between the central axis of the front inlet port on the intake manifold and the outlet plane of the intake air passage is 42° - 48°, and the central axis of the rear inlet port and the outlet of the intake air passage The angle between the planes is 65° - 70°, the front inlet port is the methanol inlet port, corresponding to the first set of oil rail assembly; the rear inlet port is the gasoline inlet port, corresponding to the second set Oil rail assembly. The two fuels of the present invention are mainly methanol, and China is mainly made of coal to methanol. Methanol is simple to manufacture and abundant in resources. As a main fuel, methanol is used. The nozzles are arranged in the front row to ensure an optimum spray angle and to ensure precise control of the injection volume according to different operating conditions. Gasoline is mainly used to meet the needs of car start-up and methanol exhaustion, so its nozzles are arranged in the rear row, and the spray angle allows a slight offset. This arrangement makes reasonable use of the limited space to ensure precise control of the two fuel injections.

Preferably, the oil inlet pipe on the oil rail assembly is connected to one end of the oil rail body, and the oil return pipe on the oil rail assembly is parallel to the oil rail body, and one end of the oil return pipe on the oil rail assembly Connected to the pressure regulator, the other end extends to the end of the rail body and the inlet pipe. The oil inlet pipe is directly connected to one end of the distribution pipe, and the structure is simple. The oil inlet pipe and the oil return pipe are located on the same side, which facilitates the connection and arrangement of the external hose, and the pipeline is clear and the arrangement is reasonable and tidy. At the same time, when installing the fuel distribution pipe, the fuel distribution pipe can be installed first, and then the corresponding hose is externally connected, which makes the installation and maintenance more simple.

Preferably, the right end of the oil rail body of the first oil rail assembly is fixed with a pressure regulator, and the oil return pipe extends from the pressure regulator to the left end of the oil rail body and is flush with the oil inlet pipe; the oil of the second oil rail assembly The left end of the rail body is closed, and the other end is connected with an oil inlet pipe. The oil return pipe extends from the central pressure regulator to the right end of the oil rail body and is flush with the oil inlet pipe. The installation position of the pressure regulator is determined by the installation arrangement of the integrated fuel rail assembly and its accessories, and the overall arrangement in the engine compartment. The first set of oil rails always become the methanol fuel rail assembly, which is installed in the intake manifold. On the front side, the pressure regulator is installed at one end; the second set of oil rails always become the gasoline fuel rail assembly, installed on the rear side of the intake manifold, and the pressure is adjusted due to the position setting of the intake pump at the upper end of the intake manifold. The device is placed in the middle of the rail body.

Preferably, the intake air passages are four, and the two oil rail fixing seats are respectively disposed on two sides of the middle two intake air passages, and two mounting holes on the same oil rail fixing seat are located In the same installation plane, the center point line of the two front row mounting holes on the two rail mounting brackets is parallel to the center point connecting lines of the two rear row mounting holes, and the center point of the front mounting hole of the oil rail fixing seat The connection is on the intake manifold body Between the front and rear of the two rows of inlet ports. Consider that the two hoses need to be connected to the external hose, and also need to be connected to the fuel nozzle mounting hole. There must be a certain distance between the two fuel rails to facilitate the installation and maintenance of the intake manifold, so the front row will be The oil rail mounting hole is laterally disposed between the two fuel nozzle mounting holes, and the oil rail is installed by the "L" shaped oil rail mount so that the front oil rail is located above the fuel mounting hole of the front row, , the distance between the front and rear two rows of oil rails is opened, and the rear oil rails correspond to the fuel mounting holes in the rear row, so that the arrangement is more reasonable and more tidy. The two mounting holes are located on the same mounting plane for easy processing. Corresponding to the front and rear two rows of nozzle mounting holes, the two oil rail mounting holes are respectively installed with different fuel oil rails, which can ensure the installation precision of each group of fuel nozzles, and facilitate each group of nozzles. Installation and maintenance of the fuel rail.

Preferably, the angle between the connecting part of the mounting seat on the first set of oil rail assemblies and the fixing part is 85° - 95°, and the connecting part and the fixing part of the mounting seat on the second set of oil rail assemblies The angle between the two is 110° - 130°, and the distance between the two sets of oil rail assemblies is 35 to 45mm. The angle between the mount of the first oil rail assembly and the oil rail mount on the intake manifold is an acute angle, and the angle of the second set is an obtuse angle, which facilitates the installation of the two sets of oil rails and other on the fuel rail. Assembly and connection of parts.

Preferably, the front and rear two rows of oil inlets on the intake manifold are arranged in a stepped manner, the center line of the two oil inlets and the intake manifold method of the inlet air inlet of the inlet port. The center lines of the end faces of the blue discs intersect. Arranging the nozzle mount directly above the intake air passage ensures that the fuel enters the intake air passage to the best angle and improves combustion efficiency. The nozzle mounting holes on the nozzle mount are arranged in a front-to-back manner and are stepped. The two nozzle mounting holes can be separated to facilitate the installation with the oil rail, so that the nozzle mounting hole arrangement is more reasonable, and the fuel injection utilization rate is maximized. Maximize the use of the original intake manifold space, improve the fit of the intake manifold and the engine, and facilitate processing.

Therefore, the intake manifold assembly of a dual fuel automobile of the present invention has the following advantages: 1. Two groups of combustion The material installation hole corresponds to the two sets of oil rail mounting holes, the arrangement is reasonable and tidy, and the versatility is good. The connecting ends of the two sets of oil rail assemblies are arranged on both sides of the intake manifold to facilitate identification and connection of the fuel hose and the soft The tube is maintained and installed; 2. The oil inlet on the intake manifold is placed above the intake air passage, and the space is utilized reasonably, and the backflow phenomenon of the fuel droplet is prevented; 3. The oil inlet is The front and rear arrangement corresponds to the fuel injection port of the oil rail, which ensures the precise injection control of the main fuel and also facilitates the arrangement of the oil rail. 4. The lengthening of the return oil pipe is flush with the oil inlet port, which reduces the need for the external hose. The quantity, the work efficiency is improved, the arrangement is neat, and the utilization of space is greatly improved. DRAWINGS

1 is a schematic view of an intake manifold assembly of a dual fuel automobile of the present invention.

Figure 2 is a right side view of Figure 1.

Figure 3 is a plan view of Figure 1.

Figure 4 is a front elevational view of the intake manifold of Figure 1.

Figure 5 is a cross-sectional view taken along line D-D of Figure 4 .

Figure 6 is a front elevational view of the first set of fuel rail assemblies of Figure 1.

Figure 7 is a cross-sectional view taken along line C-C of Figure 6;

Figure 8 is a plan view of Figure 6.

Figure 9 is a front elevational view of the second set of fuel rail assemblies of Figure 1.

Figure 10 is a cross-sectional view taken along line B-B of Figure 9;

Figure 11 is a plan view of Figure 9. Best way to implement the invention

The technical solution of the present invention will be further specifically described below by way of embodiments and with reference to the accompanying drawings. Example:

As shown in Figures 1 and 2 and 3, an intake manifold assembly for a dual fuel vehicle includes an intake manifold 1 and a fuel rail assembly mounted to the intake manifold 1. The intake air passage 11 of the intake manifold 1 is arranged with a front inlet oil inlet port 15 and a rear two-row oil inlet port 16 which are parallel to each other, and two oil rail fixing seats 13 are arranged on the body 9 of the intake manifold 1. Two oil rail fixing seats 13 are respectively located outside the middle two intake air passages 11. Each of the oil rail fixing seats 13 is provided with two front and rear mounting holes, and four mounting holes of the two oil rail fixing seats 13 are formed. Two rows of oil rail mounting holes in front and rear, one oil rail assembly is fixed in each oil rail mounting hole, and the fuel injection ports on the front and rear oil rail assemblies respectively and the front and rear oil inlets on the intake manifold 1 Corresponding. A first set of oil rail assembly 2 is connected to the front inlet port on the intake manifold 1, and a second set of oil rail assembly 3 is connected to the rear inlet port of the intake manifold 2, and the same set of oil rails The ports of the oil inlet pipe 4 and the oil return pipe 5 on the assembly are located on the same side as the connection end of the external hose, the connection end of the first set of the oil rail assembly 2 in the front row and the second set of the oil rail assembly in the rear row 3 The connecting ends are respectively located at both ends of the intake manifold 1. The first set of fuel rail assembly 2 is a methanol oil rail assembly, the second set of oil rail assembly 3 is a gasoline fuel rail assembly, methanol is the main fuel, and gasoline is used as a starting and standby fuel. The oil inlet pipe 4 and the oil return pipe 5 of the first oil rail assembly 2 are located on the left side of the intake manifold 1, and the oil inlet pipe 4 and the oil return pipe 5 of the second oil rail assembly 3 are located at the intake manifold 1. Right.

As shown in FIGS. 4 and 5, the intake manifold 1 is integrally cast, including an intake manifold body 9, a resonant cavity 10 is disposed at an upper end of the body 9, and an intake air passage 11 is connected to the resonant cavity 10. There are four intake air passages 11, and the intake air passages 11 are distributed in a claw shape.

An intake manifold connecting seat 14 for connection is provided at a lower end of the body 9, and the intake manifold connecting seat 14 is Connection flange type for easy machining and fixing, for connecting and fixing the intake manifold to the engine. An oil inlet integrally formed with the body 9 is disposed directly above each of the intake air passages 11. The inlet port has two rows of front and rear ports, and is connected to the fuel injection port 17 on the oil rail assembly on which the injector is mounted. The center line of the two oil inlets above the same intake air passage 11 intersects and intersects the center line of the intake manifold flange end surface at the outlet of the intake air passage 11. The two inlet ports are cylindrical, and the stepped shape is arranged one above the other above the intake air passage 11. The angle A between the inlet port 15 of the front row and the end face of the intake manifold connector flange is 45°, and the angle B between the rear inlet port 16 and the end face of the intake manifold connector flange is 67. ° . Two oil rail fixing seats 13 are disposed on the body 9 of the intake manifold, and two oil rail fixing seats 13 are respectively located outside the middle two intake air passages 3, and the upper end surface of the oil rail fixing seat 13 is a flat surface. The length of the fixing base 13 is 35, and two mounting holes are axially parallel in the plane of each of the oil rail fixing seats 13, and the two fixing seats form a front mounting hole 18 and a rear mounting hole 19, two The distance between the oil drain mounting holes is 12. The transverse axis of the front mounting hole 18 is located between the front inlet port 15 and the rear inlet port 16 for fixing the methanol rail assembly to facilitate the installation of the rail assembly and the intake manifold inlet. Fit; the rear rail mounting hole 19 is used to install a gasoline fuel rail assembly. Two support ribs 12 are disposed on the body 9 of the intake manifold. The two support ribs 12 are respectively located outside the middle two intake air passages 11, and the inner sides of the two oil rail fixing seats 13 are added to the intake manifold. Strength of.

As shown in Figures 6 and 7 and 8, the pressure regulator 6 of the first oil rail assembly 2 is located on the right side of the intake manifold 1, and the oil inlet pipe 4 on the first oil rail assembly 2 is connected to the fuel rail. The left end of the body ,, the cross section of the oil pipe body 7 is square, one end of the oil return pipe 5 is connected to the pressure regulator 6, and the other end extends to one end of the oil inlet pipe 4 of the oil rail body 7, and the oil inlet pipe 4 and the oil return pipe 5 are flush. The oil return pipe 6 is a straight pipe which is fixed by being spliced to the lower surface of the oil rail body 7. The oil inlet pipe 4 is an elbow, and the pipe body is bent upward at one end of the external hose so that there is an angle between the inlet pipe 4 and the port of the oil return pipe 5, thereby facilitating the total in the fuel rail. An external hose is installed and arranged at the same end to make the structure neat and compact. The rear surface of the oil rail body 7 is distributed with four fuel injection ports 17 from left to right, and two "L"-shaped mounting seats 8 connected to the intake manifold 1 are connected to the rear surface of the oil rail body 7, The "L" shaped mount 8 includes a connecting member 81 that is coupled to the rail body 7 and a stationary member 82 that is in contact with the intake manifold 1. The length of the oil rail body 330 is 330 mm, the length of the oil inlet pipe 4 is 50 mm, and the length of the oil return pipe 5 is 380 mm.

As shown in Figures 9 and 10 and 11, the oil inlet pipe 4 of the second oil rail assembly 3 is connected to the right end of the oil rail body ,, the left end of the oil rail body 7 is sealed, and the pressure regulator 6 is mounted on the oil rail body 7. In the middle, the pressure regulator 6 is connected to the oil return pipe 5, which is a straight pipe, which is extended by the pressure regulator 6 to the right end of the oil rail body 7, and the end of the oil return pipe 5 is substantially flat with the end of the oil feed pipe 4. Qi. The oil return pipe 5 is located below the oil rail main body 7, and is fixed by being connected to the connecting plate 83 of the "L"-shaped mounting seat 8 on the oil rail body. The connecting plate 83 is attached to the outer end surface of the fixing member on the mounting base 8, and is opposite to the orientation of the connecting plate 7 on the mounting base 8. The length of the oil rail body 7 is 330 mm, the length of the oil inlet pipe 2 is 50 mm, and the length of the oil return pipe 6 is 180 dishes. The return line 5 extends from the pressure regulator 6 to one end of the rail body , to facilitate installation, placement and maintenance of the second set of rail assemblies on the intake manifold, particularly for dual fuel vehicles.

The oil rail body 7 fixes the fixing member 82 of the "L"-shaped mounting seat on the oil rail assembly to the oil rail fixing seat 13 by screws, and the two "L"-shaped mounting seats 8 on the same oil rail fixing seat 13 The fixing members 82 are connected, and the two "L"-shaped mounting seats 8 are oppositely mounted to form a bracket shape, which increases the distance between the two sets of oil rails, and facilitates the installation, arrangement and maintenance of the oil rails. The angle between the connecting member 81 and the fixing member 82 of the "L"-shaped mounting seat 8 of the first oil rail assembly 2 is 90°, and the "L"-shaped mounting seat 8 of the second set of the oil rail assembly 3 The angle between the connecting member 81 and the fixing member 82 is 120°. The distance between the two sets of oil rail assemblies is 40mm.

The above description is only a preferred embodiment of the present invention and is not intended to be in any form of the present invention. Limitation. Although the present invention has been disclosed above in the preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention by using the methods and technical contents disclosed above, or modify the equivalents of equivalent changes without departing from the scope of the technical solutions of the present invention. Example. Therefore, any simple modifications, equivalent changes, and modifications of the above embodiments may be made without departing from the spirit and scope of the invention.

Claims

Rights request

An intake manifold assembly for a dual fuel vehicle, comprising an intake manifold and a fuel rail assembly mounted on the intake manifold, wherein: the intake manifold is mounted with two sets The oil rail assembly, the ports of the oil inlet pipe and the oil return pipe on the same oil rail assembly are located on the same side as the connection end of the external hose, and the connection ends of the first set of oil rails and the connection ends of the second set of oil rails are respectively located Both sides of the intake manifold.

2 . The intake manifold assembly of a dual fuel automobile according to claim 1 , wherein: the intake air passage of the intake manifold is provided with front and rear two rows of oil inlets, at the intake air. The body of the manifold is provided with two oil rail fixing seats, and the oil rail fixing seat is provided with two rows of front and rear mounting holes, and one oil rail assembly is fixed in each row of mounting holes, and two oil and gas rail assemblies are arranged in front and rear. The nozzle mounting ports on the top correspond to the front and rear two inlet ports respectively.

3 . The intake manifold assembly of a dual fuel automobile according to claim 2 , wherein: the oil rail assembly is fixed with an “L”-shaped mounting seat, and the mounting base comprises a connecting component and a fixing component, wherein the connecting component is connected to the oil rail body, and the fixing component is connected to the oil rail fixing seat on the intake manifold by a screw, the oil rail fixing seat is a plane, and the two oil rail assemblies are mounted The seat is fixed to the oil rail fixing seat by screws, and the fixing parts are connected on the plane of the oil rail fixing seat.

The intake manifold assembly for a dual fuel automobile according to claim 1 or 2 or 3, wherein: the front inlet port on the intake manifold and the end face of the intake manifold connecting seat The angle between the rear inlet port and the end face of the intake manifold connector is 65° - 70°, and the front inlet port is the methanol inlet port, corresponding to the first set of oil rails. The rear inlet port is a gasoline inlet, corresponding to the second set of oil rail assemblies.

5. The intake manifold assembly for a dual fuel vehicle according to claim 4, wherein: the pressure regulator of the first set of oil rail assemblies is fixed to one end of the oil rail body; Second set of oil The pressure regulator of the rail assembly is fixed in the middle of the rail body.

The intake manifold assembly of a dual fuel automobile according to claim 1 or 2 or 3, wherein: the oil inlet pipe on the oil rail assembly is connected to one end of the oil rail body, The oil return pipe on the oil rail assembly is parallel with the oil rail body, and one end of the oil return pipe on the oil rail assembly is connected to the pressure regulator, and the other end extends to the end of the oil rail body and the oil inlet pipe.

7 . The intake manifold assembly of a dual fuel automobile according to claim 5 , wherein: the right end of the oil rail body of the first oil rail assembly is fixed with a pressure regulator, and the oil return pipe is regulated by pressure The left end of the oil rail body is flush with the oil inlet pipe; the left end of the oil rail body of the second oil rail assembly is closed, and the other end is connected with an oil inlet pipe, and the oil return pipe extends from the central pressure regulator to the oil rail body The right end is flush with the inlet pipe.

8 . The intake manifold assembly of a dual fuel automobile according to claim 2 , wherein: the intake air passages are four, and the two oil rail fixing seats are respectively disposed in the middle On both sides of the two intake air passages, the two mounting holes on the same oil rail mount are located in the same mounting plane, and the center points of the two front mounting holes on the two rail mounts are connected to the two The center point connecting lines of the rear mounting holes are parallel to each other, and the center point connecting line of the front mounting holes of the oil rail fixing seat is located between the center point connecting lines of the front and rear two rows of oil inlets.

9. An intake manifold assembly for a dual fuel vehicle according to claim 3 or claim 8 wherein the angle between the connecting member and the fixed member of the mounting seat on the first set of oil rail assemblies 85° - 95 °, the angle between the connecting part and the fixing part of the mounting seat on the second oil rail assembly is 110° - 130°, and the distance between the two sets of oil rail assemblies is 35 45 let.

The intake manifold assembly of a dual-fuel automobile according to claim 2 or 3 or 8, wherein: the front and rear two rows of oil inlets on the intake manifold are stepped forward and backward , two rows of oil The intersection of the axis of the port coincides with the center of the intake manifold connection seat.