CN111042961A

CN111042961A - Air inlet assembly and V-shaped engine

Info

Publication number: CN111042961A
Application number: CN201911418479.XA
Authority: CN
Inventors: 刘俊龙; 庞斌; 董卫涛; 郑茂勇
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-04-21

Abstract

When the air inlet assembly is used, the ignition intervals of the first cylinder, the fourth cylinder, the sixth cylinder and the seventh cylinder are 180 degrees CA, and the ignition intervals of the second cylinder, the third cylinder, the fifth cylinder and the eighth cylinder are 180 degrees CA, so that air inlet interference cannot be generated in the air inlet process of the cylinder corresponding to the first air inlet pipe, air inlet interference cannot be generated in the air inlet process of the cylinder corresponding to the second air inlet pipe, air inlet uniformity can be improved, and surging cannot be generated in the air inlet process.

Description

Air inlet assembly and V-shaped engine

Technical Field

The invention relates to the technical field of engines, in particular to an air inlet assembly and a V-shaped engine.

Background

In order to improve the transient response of the engine and reduce the cost, most V-type 8-cylinder engines adopt a scheme that two superchargers are connected in parallel, at the moment, if an air inlet manifold is an 8-cylinder integrated engine, when one cylinder or a plurality of cylinders are failed and do not work or are stopped, the corresponding supercharger rotating speed is reduced to cause surging, when an air inlet pipe is communicated, the flow of the superchargers with the same pressure ratio but low rotating speed is reduced to induce surging, in addition, because the ignition sequence of all the V8 engines has the problem that the two cylinders on the same side are ignited simultaneously, the air inlet uniformity of each cylinder is poor.

Therefore, how to improve the intake uniformity and reduce the occurrence of the surge phenomenon is a problem to be solved urgently by those skilled in the art.

Disclosure of Invention

In view of the above, the technical problem to be solved by the present invention is how to improve intake uniformity and reduce surge, and therefore, the present invention provides an intake assembly and a V-type engine.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides an air intake assembly, is applied to V type engine, V type engine is including being located first cylinder, second cylinder, third cylinder and the fourth cylinder that first side and arrange in proper order and being located the second side and the fifth cylinder, sixth cylinder, seventh cylinder and the eighth cylinder that arrange in proper order, the interval of firing of first cylinder, fourth cylinder, sixth cylinder and seventh cylinder is 180 CA, second cylinder, third cylinder the interval of firing of fifth cylinder and eighth cylinder is 180 CA, air intake assembly includes:

the first air inlet pipe is provided with a first interface communicated with the first cylinder, a second interface communicated with the fourth cylinder, a third interface communicated with the sixth cylinder and a fourth interface communicated with the seventh cylinder;

the second air inlet pipe is provided with a fifth interface communicated with the second cylinder, a sixth interface communicated with the third cylinder, a seventh interface communicated with the fifth cylinder and an eighth interface communicated with the eighth cylinder.

In one embodiment of the invention, a first compressor is arranged at the inlet end of the first air inlet pipe; and a second air compressor is arranged at the inlet end of the second air inlet pipe.

In one embodiment of the present invention, the first intake pipe includes a first intake manifold, a first manifold that communicates the first intake manifold with the first cylinder, a second manifold that communicates the first intake manifold with the fourth cylinder, a third manifold that communicates the first intake manifold with the sixth cylinder, and a fourth manifold that communicates the first intake manifold with the seventh cylinder, where the first manifold forms the first port, the second manifold forms the second port, the third manifold forms the third port, and the fourth manifold forms the fourth port.

In one embodiment of the present invention, the first intake manifold includes a first intake main body portion extending in a first direction, a second intake main body portion arranged to be inclined from the first intake main body portion toward the sixth cylinder, a third intake main body portion extending from the second intake main body portion toward the seventh cylinder in the first direction, and a fourth intake main body portion arranged to be inclined from the third intake main body portion toward the fourth cylinder.

In one embodiment of the present invention, the second intake pipe includes a second intake manifold, a fifth manifold that communicates the second intake manifold with the second cylinder, a sixth manifold that communicates the second intake manifold with the third cylinder, a seventh manifold that communicates the second intake manifold with the fifth cylinder, and an eighth manifold that communicates the second intake manifold with the eighth cylinder, wherein the fifth manifold forms the fifth port, the sixth manifold forms the sixth port, the seventh manifold forms the seventh port, and the eighth manifold forms the eighth port.

In one embodiment of the present invention, the second intake manifold includes a fifth intake main body portion extending in the first direction, a sixth intake main body portion arranged to be inclined in the second cylinder direction from the fifth intake main body portion, a seventh intake main body portion extending in the first direction in the third cylinder direction from the sixth intake main body portion, and an eighth intake main body portion arranged to be inclined in the eighth cylinder direction from the seventh intake main body portion.

In one embodiment of the present invention, an angle between an air intake direction of the first manifold, the second manifold, the third manifold and the fourth manifold and an air intake direction of the first air intake manifold is an acute angle.

In one embodiment of the present invention, an angle between an air intake direction of the fifth manifold, the sixth manifold, the seventh manifold and the eighth manifold and an air intake direction of the second air intake manifold is an acute angle.

The invention also discloses a V-shaped engine which comprises the air inlet assembly.

In one embodiment of the present invention, the included angle of the V-engine is 90 °.

According to the technical scheme, when the air inlet assembly is used, the ignition intervals of the first cylinder, the fourth cylinder, the sixth cylinder and the seventh cylinder are 180 degrees CA, and the ignition intervals of the second cylinder, the third cylinder, the fifth cylinder and the eighth cylinder are 180 degrees CA, so that air inlet interference cannot be generated in the air inlet process of the cylinder corresponding to the first air inlet pipe, air inlet interference cannot be generated in the air inlet process of the cylinder corresponding to the second air inlet pipe, air inlet uniformity can be improved, and surging cannot be generated in the air inlet process.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of an air intake assembly provided in the prior art;

FIG. 2 is a schematic view of an air intake assembly according to the present invention;

FIG. 3 is a schematic diagram illustrating an air intake assembly according to the present invention comparing with the prior art;

FIG. 4 is a schematic diagram of a front three-dimensional duct layout of an air intake assembly according to the present invention;

FIG. 5 is a schematic view of a bottom three-dimensional piping arrangement of an air inlet assembly according to the present invention;

in the drawing, 101 is a first cylinder, 102 is a second cylinder, 103 is a third cylinder, 104 is a fourth cylinder, 105 is a fifth cylinder, 106 is a sixth cylinder, 107 is a seventh cylinder, 108 is an eighth cylinder, 200 is a first intake pipe, 201 is a first intake manifold, 202 is a first manifold, 203 is a second manifold, 204 is a third manifold, 205 is a fourth manifold, 300 is a second intake pipe, 301 is a second intake manifold, 302 is a fifth manifold, 303 is a sixth manifold, 304 is a seventh manifold, 305 is an eighth manifold, 2011 is a first intake main body portion, 2012 is a second intake main body portion, 2013 is a third intake main body portion, 2014 is a fourth intake main body portion, 3011 is a fifth intake main body portion, 3012 is a sixth intake main body portion, 3013 is a seventh intake main body portion, and 3014 is an eighth intake main body portion;

Detailed Description

As shown in fig. 1, the V-type engine has two completely separated sides of an intake assembly, wherein the intake assembly includes a first cylinder 101, a second cylinder 102, a third cylinder 103 and a fourth cylinder 104 which are arranged in sequence on a first side, and a fifth cylinder 105, a sixth cylinder 106, a seventh cylinder 107 and an eighth cylinder 108 which are arranged in sequence on a second side, the first cylinder 101, the second cylinder 102, the third cylinder 103 and the fourth cylinder 104 are communicated with a first intake pipe 200, and the fifth cylinder 105, the sixth cylinder 106, the seventh cylinder 107 and the eighth cylinder 108 are communicated with a second intake pipe 300. The ignition sequence of the V-shaped engine is shown in the table 1, two cylinders are always continuously ignited on the same side, and the other side has discontinuous air intake, so that the surge of a supercharger is easily caused, the uniformity of each cylinder is poor, and particularly the arrangement form of the existing air inlet pipe is poor.

TABLE 1V-TYPE 8 CYLINDER ENGINE FIRE-IGNITING SEQUENCE

V-type 8-cylinder engine ignition sequence
	1-5-4-2-6-3-7-8
1-5-4-8-6-3-7-2
	1-8-4-2-7-3-6-5
1-8-4-2-7-3-6-5
	1-5-4-8-7-2-6-3
1-2-7-3-4-5-6-8
	1-8-4-3-6-2-7-5

Therefore, the core of the invention is to provide an air inlet assembly and a V-shaped engine, so as to improve the uniformity of air inlet and reduce the occurrence of surge phenomenon.

The embodiments described below do not limit the contents of the invention described in the claims. The entire contents of the configurations shown in the following embodiments are not limited to those required as solutions of the inventions described in the claims.

Referring to fig. 2, the intake assembly according to the embodiment of the present invention is applied to a V-type engine, the V-type engine includes a first cylinder 101, a second cylinder 102, a third cylinder 103, and a fourth cylinder 104 that are sequentially arranged on a first side, and a fifth cylinder 105, a sixth cylinder 106, a seventh cylinder 107, and an eighth cylinder 108 that are sequentially arranged on a second side, an ignition interval of the first cylinder 101, the fourth cylinder 104, the sixth cylinder 106, and the seventh cylinder 107 is 180 ° CA, and an ignition interval of the second cylinder 102, the third cylinder 103, the fifth cylinder 105, and the eighth cylinder 108 is 180 ° CA, and the intake assembly includes:

a first intake pipe 200, wherein the first intake pipe 200 is provided with a first port communicating with the first cylinder 101, a second port communicating with the fourth cylinder 104, a third port communicating with the sixth cylinder 106, and a fourth port communicating with the seventh cylinder 107;

a second intake pipe 300, wherein the second intake pipe 300 is provided with a fifth port communicated with the second cylinder 102, a sixth port communicated with the third cylinder 103, a seventh port communicated with the fifth cylinder 105, and an eighth port communicated with the eighth cylinder 108.

In one embodiment of the present invention, the inlet end of the first air inlet pipe 200 is provided with a first compressor; a second compressor is provided at the inlet end of the second air inlet pipe 300.

When the air intake assembly of the present invention is used, the firing intervals of the first cylinder 101, the fourth cylinder 104, the sixth cylinder 106 and the seventh cylinder 107 are 180 ° CA, and the firing intervals of the second cylinder 102, the third cylinder 103, the fifth cylinder 105 and the eighth cylinder 108 are 180 ° CA, so that the cylinder corresponding to the first air intake pipe 200 does not generate air intake interference during air intake, and the cylinder corresponding to the second air intake pipe 300 does not generate air intake interference during air intake, thereby improving air intake uniformity and preventing surging from being generated during continuous air intake.

Referring to fig. 3, in order to better compare different exhaust pipe arrangement forms to calculate and analyze two exhaust pipes, the last ignition sequence is selected from table 1 as a research object, and the ignition sequence has representativeness of the above problems, and the position a (named layout-1) in fig. 1 and the position B (named layout-2) in fig. 2 according to the embodiment of the present invention are calculated and analyzed, wherein the pipe diameters of the two arrangement forms are the same, and intake air flows corresponding to different crank angles appear, as can be seen from fig. 3, the intake air flow corresponding to layout-1 has a section of instantaneous reduction in flow and even backflow under the same average intake pressure, and the surge of the corresponding supercharger is easily caused, and the flow fluctuation is particularly large, and the surge risk of the surge is larger when the fluctuation is larger; and for the intake air flow corresponding to layout-2, the fluctuation is in a smaller range, and the instantaneous reduction of the flow and even backflow cannot occur, so that the supercharger operates relatively stably, surging cannot occur, the same power output is achieved under the condition of the same air inlet configuration, the oil consumption rate of layout-2 is reduced by about 1.5g/kwh compared with layout-1, and the economical efficiency is better.

The first intake pipe 200 is directly communicated with the corresponding cylinder, or is communicated with the corresponding cylinder through a manifold, the first intake pipe 200 includes a first intake manifold 201, a first manifold 202 communicating the first intake manifold 201 with the first cylinder 101, a second manifold 203 communicating the first intake manifold 201 with the fourth cylinder 104, a third manifold 204 communicating the first intake manifold 201 with the sixth cylinder 106, and a fourth manifold 205 communicating the first intake manifold 201 with the seventh cylinder 107, wherein the first manifold 202 forms the first port, the second manifold 203 forms the second port, the third manifold 204 forms the third port, and the fourth manifold 205 forms the fourth port.

In order to save the installation space, the first intake manifold 201 includes a first intake main body 2011 extending in a first direction, a second intake main body 2012 inclined from the first intake main body 2011 toward the sixth cylinder 106, a third intake main body 2013 extending from the second intake main body 2012 toward the seventh cylinder 107 in the first direction, and a fourth intake main body 2014 inclined from the third intake main body 2013 toward the fourth cylinder 104.

Referring to fig. 4 and 5, in an embodiment of the present invention, the second intake pipe 300 includes a second intake manifold 301, a fifth manifold 302 communicating the second intake manifold 301 with the second cylinder 102, a sixth manifold 303 communicating the second intake manifold 301 with the third cylinder 103, a seventh manifold 304 communicating the second intake manifold 301 with the fifth cylinder 105, and an eighth manifold 305 communicating the second intake manifold 301 with the eighth cylinder 108, where the fifth manifold 302 forms the fifth port, the sixth manifold 303 forms the sixth port, the seventh manifold 304 forms the seventh port, and the eighth manifold 305 forms the eighth port.

In order to save space, the second intake manifold 301 includes a fifth intake body portion 3011 extending in a first direction, a sixth intake body portion 3012 arranged to be inclined in the direction from the fifth intake body portion 3011 toward the second cylinder 102, a seventh intake body portion 3013 extending in the first direction from the sixth intake body portion 3012 toward the third cylinder 103, and an eighth intake body portion 3014 arranged to be inclined in the direction from the seventh intake body portion 3013 toward the eighth cylinder 108.

The first intake manifold 201 and the second intake manifold 301 of the intake assembly according to the embodiment of the present invention may be arranged to meet space requirements.

In the embodiment of the present invention, in order to ensure smooth air intake of the cylinders, the air intake directions of the first manifold 202, the second manifold 203, the third manifold 204, and the fourth manifold 205 and the air intake direction of the first air intake manifold 201 form an acute angle, so as to prevent the first manifold 202, the second manifold 203, the third manifold 204, and the fourth manifold 205 from entering the first air intake manifold 201, i.e., from the direction of the reverse air flow, as shown by the arrows in fig. 4 and 5.

Similarly, the air intake direction of the fifth manifold 302, the sixth manifold 303, the seventh manifold 304 and the eighth manifold 305 forms an acute angle with the air intake direction of the second air intake manifold 301, so as to prevent the fifth manifold 302, the sixth manifold 303, the seventh manifold 304 and the eighth manifold 305 from entering the second air intake manifold 301, i.e. the direction of the reverse air flow, as shown by the arrows in fig. 4 and 5.

The invention also discloses a V-shaped engine which comprises the air inlet assembly. Since the air intake assembly has the above beneficial effects, the V-type engine including the air intake assembly also has corresponding effects, and the detailed description is omitted here.

In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides an air intake assembly, is applied to V type engine, V type engine is including being located first side and the first cylinder, second cylinder, third cylinder and the fourth cylinder that arrange in proper order and being located the second side and the fifth cylinder, sixth cylinder, seventh cylinder and the eighth cylinder that arrange in proper order, its characterized in that, the interval of firing of first cylinder, fourth cylinder, sixth cylinder and seventh cylinder is 180 CA, second cylinder, third cylinder the interval of firing of fifth cylinder and eighth cylinder is 180 CA, air intake assembly includes:

2. The air intake assembly of claim 1, wherein the inlet end of the first air intake conduit is provided with a first compressor; and a second air compressor is arranged at the inlet end of the second air inlet pipe.

3. The intake assembly of claim 2, wherein the first intake manifold includes a first intake manifold, a first manifold communicating the first intake manifold with the first cylinder, a second manifold communicating the first intake manifold with the fourth cylinder, a third manifold communicating the first intake manifold with the sixth cylinder, and a fourth manifold communicating the first intake manifold with the seventh cylinder, wherein the first manifold forms the first port, the second manifold forms the second port, the third manifold forms the third port, and the fourth manifold forms the fourth port.

4. The intake assembly of claim 3, wherein the first intake manifold includes a first intake body portion extending in a first direction, a second intake body portion arranged to be inclined in the sixth cylinder direction from the first intake body portion, a third intake body portion extending in the first direction in the seventh cylinder direction from the second intake body portion, and a fourth intake body portion arranged to be inclined in the fourth cylinder direction from the third intake body portion.

5. The intake assembly of claim 2, wherein the second intake manifold includes a second intake manifold, a fifth manifold communicating the second intake manifold with the second cylinder, a sixth manifold communicating the second intake manifold with the third cylinder, a seventh manifold communicating the second intake manifold with the fifth cylinder, and an eighth manifold communicating the second intake manifold with the eighth cylinder, wherein the fifth manifold forms the fifth port, the sixth manifold forms the sixth port, the seventh manifold forms the seventh port, and the eighth manifold forms the eighth port.

6. The intake assembly of claim 3, wherein the second intake manifold includes a fifth intake body portion extending in a first direction, a sixth intake body portion arranged to be inclined in the second cylinder direction from the fifth intake body portion, a seventh intake body portion extending in the first direction in the third cylinder direction from the sixth intake body portion, and an eighth intake body portion arranged to be inclined in the eighth cylinder direction from the seventh intake body portion.

7. The intake assembly of claim 3, wherein the intake direction of the first, second, third and fourth manifolds is at an acute angle to the intake direction of the first intake manifold.

8. The intake assembly of claim 3, wherein the intake direction of the fifth, sixth, seventh and eighth manifolds is at an acute angle to the intake direction of the second intake manifold.

9. A V-type engine characterized by comprising the intake assembly according to any one of claims 1 to 8.

10. The V-engine of claim 9 wherein said V-engine included angle is 90 °.