CN1510256A

CN1510256A - Exhaust divided manifold of IC engine

Info

Publication number: CN1510256A
Application number: CNA200310123750XA
Authority: CN
Inventors: 川水清身; 山田仁
Original assignee: Nissan Motor Co Ltd
Current assignee: Nissan Motor Co Ltd
Priority date: 2002-12-24
Filing date: 2003-12-24
Publication date: 2004-07-07
Anticipated expiration: 2023-12-24
Also published as: DE60310024T2; JP2004204730A; DE60310024D1; JP4158516B2; KR20040057966A; KR100566849B1; EP1433934A2; CN1281858C; EP1433934A3; EP1433934B1

Abstract

An exhaust manifold for a four-cylinder internal combustion engine, including four branches, a downstream exhaust pipe connected with the four branches, and a partition wall dividing an exhaust path in the downstream exhaust pipe into first and second passages each having a semicircular section. Each of the first and second passages is connected with two of the branches which are connected with two of the four engine cylinders having non-continuous order of ignition and communicated with first and second quarter-circular regions in the semicircular section of the passages, respectively. An air-fuel ratio sensor mounted to the downstream exhaust pipe projects into both of the passages through a cutout formed on one side of the partition wall in a width direction perpendicular to an axial direction of the downstream exhaust pipe. A communication portion formed in the partition wall fluidly communicates the passages with each other.

Description

The gas exhaust manifold that is used for internal-combustion engine

Technical field

The present invention relates to a kind of improved gas exhaust manifold, this gas exhaust manifold is used to have the internal-combustion engine of four cylinders in upright arrangement, for example in-line arrangement four-cylinder internal-combustion engine and V-type eight cylinder IC engines.

Background of invention

In the in-line arrangement four-cylinder internal-combustion engine, preferably make the exhaust of from four cylinders, discharging be merged into one air-flow, so that the interference between the surperficial exhaust with the form of so-called 4-2-1.Proposed to be used for the gas exhaust manifold of in-line arrangement four-cylinder internal-combustion engine, wherein, four branches in the upstream that links to each other with four cylinders link to each other with the downstream row tracheae with pair of channels.These four branches connect in office, respective downstream end, so that form two pairs of branches.Pair of channels is separated by the partition that is arranged in the downstream row tracheae.Each passage links to each other with passage in two branches.The downstream part of outlet pipe links to each other with catalytic converter by Diffuser.Usually, in order to monitor the exhaust of from all cylinders, discharging, single air-fuel ratio sensor (lambda sensor or regional air=fuel ratio sensor) is arranged in the vent systems, so that by being formed at the mounting hole in the circumferential wall of outlet pipe and being formed at the otch of partition one side and broad ways protrudes into this in the outlet pipe passage, this width direction promptly flows to the direction of the blast air in downstream side perpendicular to the axial direction of outlet pipe perpendicular to the upstream side from outlet pipe.

U.S. Patent No. 6012315 (disclosing No.9-323119 first corresponding to Japanese patent application) discloses a kind of outlet pipe with partition.This outlet pipe is useful on the mounting hole of lambda sensor.This partition is formed with the otch that cooperates with this mounting hole, so that lambda sensor is installed.

Japanese patent application discloses No.2001-82140 first and discloses a kind of partition in outlet pipe.This partition has a plurality of holes, is used to make that fluid is communicated with between the passage in the outlet pipe, that be separated from each other by partition.

Summary of the invention

But, in above-mentioned prior art, air-fuel ratio sensor broad ways is arranged in a side of partition.For this structure, each of outlet pipe to passage, with the position of corresponding that side of a side of partition than the more close air-fuel ratio sensor of the opposite side of passage.From a side of one exhaust flow channel in two branches, and the amount that contacts with the air-fuel ratio sensor greater than another exhaust that flows into the opposite side of this passage from two branches of the amount that contacts with the air-fuel ratio sensor.That is, by amount in two cylinders, that contact with the air-fuel ratio sensor with exhaust that a continuous cylinder in these two branches is discharged greater than by amount in two cylinders, that contact with the air-fuel ratio sensor with the exhaust of another another cylinder discharge that links to each other in these two branches.Therefore, the air-fuel ratio sensor can not accurately be measured from total body portion of the exhaust of cylinder discharge.This will reduce the accuracy of the measurement of exhaust being carried out by the air-fuel ratio sensor.

This problem can not be solved by a kind of scheme in above-mentioned back of the prior art, and this scheme discloses partition and had a plurality of holes.

An object of the present invention is to provide a kind of improvement gas exhaust manifold that is used for the in-line arrangement four-cylinder internal-combustion engine, it can prevent that accuracy reduces when utilizing the air-fuel ratio sensor that the exhaust of process gas exhaust manifold is measured.

In one aspect of the invention, provide a kind of gas exhaust manifold, this gas exhaust manifold is connected with the internal-combustion engine with four cylinders, and this gas exhaust manifold comprises:

Four branches are respectively applied for from four cylinders and discharge exhaust;

The downstream row tracheae, four branches of this downstream row tracheae and this link to each other;

Partition, this partition is divided into first passage and second channel with the exhaust passageway in the downstream row tracheae, this first passage and second channel each have semi-circular cross-section, this partition has otch, this notch shape is formed on the side on the width direction of this partition, and this width direction is perpendicular to the axial direction of downstream row tracheae;

Described each first and second passage respectively with four branches in two be connected, these two branches link to each other with discontinuous two of ignition order in four cylinders, in four branches two respectively with the first and second quadrant shape regional connectivities of the semi-circular cross-section of each first and second passage;

The air-fuel ratio sensor, this air-fuel ratio sensor is installed on the downstream row tracheae, so that extend in first and second passages by the otch of partition;

Connected part, this connected part is formed in the partition, and making the first and second passage fluid communication with each other, this connected part that the first portion and the second portion that is positioned at the opposite side of partition of a side that is positioned at partition be arranged, this first portion is positioned at the downstream side with respect to second portion.

Brief description of drawings

Fig. 1 is the side view of the gas exhaust manifold of first embodiment of the invention.

Fig. 2 is the perspective view of the gas exhaust manifold described in Fig. 1.

Fig. 3 is the axial partial sectional view of first embodiment's gas exhaust manifold along gas exhaust manifold, has represented to be arranged in the interior partition of downstream row tracheae of gas exhaust manifold.

Fig. 4 is the sectional view along the line 4-4 of Fig. 3.

Fig. 5 A and 5B are the interpretation mapss of discharging and flow into the blast air the downstream row tracheae from cylinder.

Fig. 6 A does not have under the situation of slit at partition, through the interpretation maps of downstream row tracheae and the blast air that contacts with catalytic converter.

Fig. 6 B is the interpretation maps that is similar to Fig. 6 A, but has represented the blast air when partition has slit.

Fig. 7 is the view that is similar to Fig. 3, but has represented the partition of the gas exhaust manifold of second embodiment of the invention.

DETAILED DESCRIPTION OF THE PREFERRED

Introduce the gas exhaust manifold of first embodiment of the invention below with reference to Fig. 1 to 6B.In this embodiment, gas exhaust manifold is used for the in-line arrangement four-cylinder internal-combustion engine of automobile.As shown in Figure 1, gas exhaust manifold 2 has upstream extremity that is connected with a side of cylinder head 1 and the downstream that is connected with catalytic converter 3.Gas exhaust manifold 2 constitutes four passages that make at upstream side and is merged into two passages in the downstream side.

As shown in Figure 2, gas exhaust manifold 2 four

branches

5,6,7 of comprising the upstream and 8 and the downstream row tracheae 9 that links to each other with four branches 5 to 8 of upstream.The downstream that there is the upstream extremity that links to each other with cylinder head 1 by flange 4 in four branches 5 to 8 of upstream and links together and link to each other with the upstream extremity of downstream row tracheae 9.Four

branches

5,6,7 and 8 of upstream are communicated with cylinder #1, #2, #3 and #4 fluid respectively.Partition 10 is arranged in the downstream row tracheae 9, and extending axially at the whole axial length upper edge downstream row tracheae of this downstream row tracheae.Partition 10 will be divided into pair of

channels

11 and 12 at the exhaust passageway in the downstream row tracheae 9 of approximate circular cross-section, and each passage has semi-circular cross-section.Partition 10 is the form of the plate of the central shaft that comprises downstream row tracheae 9.Downstream row tracheae 9 has downstream end portion, and flange 13 is installed on this downstream end portion.Flange 13 is connected with the inlet flange 15 of the Diffuser 14 of catalytic converter 3.

Wherein, each passage 11 in downstream row tracheae 9 with 12 by in four branches 5 to 8, with four cylinder #1 to #4 in have that two cylinders of discontinuous igniting order are connected two branches and be communicated with these two cylinders among four cylinder #1 to #4.In other words,

passage

11 and 12 is communicated with not tactic two cylinders of ignition order among four cylinder #1 to #4.In the present embodiment, the ignition order of four cylinder #1 to #4 is as follows: #1-#3-#4-#2.Passage 11 is communicated with cylinder #1 and #4 with discontinuous ignition order by

branch

5 and 8, and this branch 5 is connected with #4 with difference cylinder #1 with 8.Enter respectively

branch

5 and 8 from the exhaust of cylinder #1 and #4 discharge.Two strands of blast airs through

branch

5 and 8 link together in passage 11.On the other hand, passage 12 is communicated with cylinder #2 and #3 with discontinuous ignition order by

branch

6 and 7, and this branch 6 is connected with #3 with difference cylinder #2 with 7.Enter respectively

branch

6 and 7 from the exhaust of cylinder #2 and #3 discharge.Two strands of blast airs through

branch

6 and 7 link together in passage 12.Blast air in passage 11 and the blast air in passage 12 are merged into one blast air at the suction side (promptly in Diffuser 14 sides) of catalytic converter 3.

Air-fuel ratio sensor 16 is installed in the relative downstream part of downstream row tracheae 9, and is arranged to the part by being formed with the otch 18 in the partition 10 along partition 10 and protrudes in two passages 11 and 12.Particularly, partition 10 has otch 18, this otch 18 be formed at partition 10, along a side perpendicular to the width direction of the axial direction of downstream row tracheae 9.Air-fuel ratio sensor 16 broad wayss are arranged in a side of partition 10.In Fig. 2, air-fuel ratio sensor 16 is arranged in the left side of partition 10.Air-fuel ratio sensor 16 inserts by the outer surface of mounting hole 17 from downstream row tracheae 9, and the part protrudes in

passage

11 and 12 by the otch 18 of partition 10.Therefore, air-fuel ratio sensor 16 is exposed in the exhaust of each

passage

11 and 12, and detects the air-fuel ratio of the exhaust in

passage

11 and 12.

Be presented in the partition 10 in outlet pipe 9 downstreams in more detail below with reference to Fig. 3 and 4.As shown in Figure 3, partition 10 extends on the whole axial length of downstream row tracheae 9.Partition 10 comprises the connected part that makes

passage

11 and 12 fluid communication with each other.This connected part is arranged such that air-fuel ratio sensor 16 deflections that are arranged in a side of partition 10 in each

passage

11 and 12 along the mobile exhaust of the opposite side broad ways of partition 10 towards broad ways.In this embodiment, connected part is the form that is arranged in the slanted slots 21 of air-fuel ratio sensor 16 upstream sides.Slit 21 extends along the width direction of partition 10, promptly extends along the left and right directions among Fig. 3, and tilts with respect to the axial direction (being the above-below direction among Fig. 3) of downstream row tracheae 9.Particularly, an end 21A of slit 21 is positioned at side partition 10, broad ways, and the other end 21B is positioned at opposite side partition 10, broad ways.In other words, an end 21A is positioned at air-fuel ratio sensor 16 sides.One end 21A is positioned at the downstream side with respect to the other end 21B.In the present embodiment, slit 21 is along on the direction perpendicular to partition 10 width directions even width being arranged.Slit 21 can appropriate variation become to make width different between upstream side and downstream side, so that regulate pressure distribution.And slit 21 can be the form of a plurality of slits.

As shown in Figure 4, downstream row tracheae 9 has almost circular cross section.Partition 10 is arranged in the downstream row tracheae 9, so that comprise the central axis of downstream row tracheae 9.Partition 10 is divided into the

passage

11 and 12 that each has basic semi-circular cross-section with the exhaust passageway in the downstream row tracheae 9.Two branches 5 that link to each other with #4 with the cylinder #1 with discontinuous igniting order link to each other with the upstream extremity of downstream row tracheae 9 with 8 downstream, so that be communicated with quadrant shape zone A and B respectively, these two quadrant shape zone A and B cooperate the passage 11 that forms semi-circular cross-section.Therefore, quadrant shape zone A and B are communicated with cylinder #1 and #4 fluid by

branch

5 and 8 respectively.Equally, two branches 6 that link to each other with #3 with the cylinder #2 with discontinuous igniting order link to each other with the upstream extremity of downstream row tracheae 9 with 7 downstream, so that be communicated with quadrant shape zone C and D respectively, these two quadrant shape zone C and B cooperate the passage 12 that forms semi-circular cross-section.Zone A and B and zone C and D are respectively by the imaginary boundary face M shown in Fig. 4 separately.Zone C and D are communicated with cylinder #2 and #3 fluid by branch 6 and 7.Air-fuel ratio sensor 16 is arranged in area B and D one side, and the exhaust of cylinder #4 and #3 is introduced in this area B and the D.By this structure, by cylinder #1 and #2 discharge and inflow region A and exhaust in the C contacts with air-fuel ratio sensor 16 amount than discharging amount that inflow region B also and exhaust in the D contact with this air-fuel ratio sensor 16 by cylinder #4 and #3 still less.One end 21A of slit 21 is near the neutral position of partition 10 parts that broad ways is being extended between area B and the D.The neutral position or the outside of partition 10 remaining parts that the other end 21B of slit 21 extends between regional A and C in broad ways.Particularly, the other end 21B of slit 21 can be arranged in the middle part of these partition 10 remaining parts and this partition 10, with peripheral edge that the internal surface of downstream row tracheae 9 links to each other between.Therefore, slit 21 at one end 21A is opened on area B and D, and is opened on regional A and C at the other end 21B.

With reference to figure 5A and 5B, explained among the figure by cylinder #1 to be discharged in the passage 11 of downstream row tracheae 9, then by the blast air in slit 21 flow channels 12.Fig. 5 A has represented the blast air from cylinder #1 discharge and flow channel 11.Fig. 5 B has represented by the blast air of slit 21 from passage 11 flow channels 12.When the exhaust of being discharged by cylinder #1 is passed through in branch's 5 flow channels 11, the regional A of this exhaust flow channel 11.At this moment, the pressure of passage 12 is lower than passage 11, and this is because just passed through passage 12 by the exhaust of cylinder #2 discharge.Because the low pressure of passage 12, a part of exhaust of the regional A of process passage 11 is by in slit 21 flow channels 12, shown in Fig. 5 B.When the slit 21, a part of exhaust is flowed along the angled perimeter of slit 21, then, and this part exhaust inlet passage 12, and flow to air-fuel ratio sensor 16 with dispersed state, shown in Fig. 5 B.

On the other hand, in the time of in from the regional A of the exhaust flow channel 11 of cylinder #1, slit 21 forms some low-pressure section.Because slit 21 is inclined to the more close air-fuel ratio sensor 16 in the downstream side that makes slit 21, promptly the low-pressure section in the downstream side is offset towards air-fuel ratio sensor 16 more than upstream side, therefore, the blast air of inflow region A turns to the area B of arranging near air-fuel ratio sensor 16 with dispersed state, shown in Fig. 5 A.Therefore, the air displacement of being discharged by cylinder #1 and contacting with air-fuel ratio sensor 16 increases.Therefore, air-fuel ratio sensor 16 can detect the exhaust of being discharged by cylinder #1 more exactly.

Be discharged to the passage 12 of downstream row tracheae 9 from cylinder #2, then by the blast air in slit 21 flow channels 11 with respect to the above-mentioned blast air symmetry that is discharged to from cylinder #1 the passage 11.Pass through in branch's 6 flow channels 12 by the exhaust that cylinder #2 discharges.At this moment, passage 12 is a low pressure, and this is because just passed through passage 12 by the exhaust of cylinder #1 discharge.Therefore, a part of exhaust of the zone C of process passage 12 is by in slit 21 flow channels 11.Because the structure of slanted slots 21, this part exhaust flows to air-fuel ratio sensor 16 with dispersed state.On the other hand, because slit 21 forms low-pressure section, therefore, the blast air of inflow region C turns to the region D of arranging near air-fuel ratio sensor 16 with dispersed state.And a part is deflected in the passage 12 by slit 21 by the exhaust that cylinder #4 is discharged in the area B of passage 11.A part is dispersed in the passage 11 by slit 21 by the exhaust that cylinder #3 is discharged in the region D of passage 12.

With reference to figure 6A and 6B, catalytic converter 3 and the blast air of impact on ceramic monoliths circuit carrier 3A have been represented to flow among the figure.Fig. 6 A has represented the blast air of generation when using the partition 10 that does not have slit 21.Fig. 6 B has represented the blast air of generation when using the partition 10 that slit 21 is arranged.Shown in the top of Fig. 6 A,, only pass through passage 11 by the exhaust that cylinder #1 and #4 discharge because partition 10 does not form slit 21.Shown in the bottom of Fig. 6 A, exhaust flows to catalytic converter 3 by Diffuser 14 from passage 11, and carries out diffusion at the Diffuser 14 part places that are arranged in passage 11 sidepieces.Then, exhaust only impacts on the part of inlet part of carrier 3A.This will have adverse effect to carrier 3A, thereby form crackle in this carrier 3A.On the contrary, when partition 10 had slit 21, shown in the top of Fig. 6 B, a part that is discharged to the exhaust in the passage 11 was by in slit 21 flow channels 12.Shown in the bottom of Fig. 6 B, the blast air by

passage

11 and 12 flows to catalytic converter 3 by Diffuser 14.Exhaust is even diffusion in Diffuser 14, and impacts on the whole inlet part of carrier 3A.

As described in above-mentioned explanation, gas exhaust manifold 2 of the present invention can prevent the exhaust interference by four cylinder #1 to #4 discharges.And the exhaust that flows in the downstream row tracheae 9 can detect the exhaust that flows into downstream row tracheae 9 more accurately by single air-fuel ratio sensor 16.Particularly, when in partition 10, forming slanted slots 21, will produce the deflection that flows to air-fuel ratio sensor 16 from

branch

5 and 6 exhausts of flowing out away from air-fuel ratio sensor 16.Precision when this can increase the exhaust that detects in downstream row tracheae 9 by air-fuel ratio sensor 16.And, exhaust can be more extensively from downstream row tracheae 9 to catalytic converter 3 diffusions.This prevents that therefore exhaust from only impacting on the part of the inlet part of catalytic converter 3, and gas exhaust manifold 2 diffusions of the present invention evenly impact on the wide region of the carrier 3A of catalytic converter 3 exhaust.

Introduce second embodiment of gas exhaust manifold 2 of the present invention below with reference to Fig. 7.This second embodiment and first embodiment's difference is that partition has a plurality of holes.As shown in Figure 7, three holes are formed in the partition 110, and as the connected part that is communicated with owing to fluid between passage 11 and 12.In the present embodiment, there is same diameter in three

holes

22,23 and 24.The line that three

holes

22,23 and 24 tilt along the width direction with respect to the axial direction of downstream row tracheae 9 and partition 110 is arranged.Intermediate hole between

hole

22 and 24 is arranged to cross interface M.Hole 22 is positioned at the downstream side of intermediate hole 23, and in side partition 110 broad wayss, that be furnished with air-fuel ratio sensor 16.Hole 22 is in the neutral position of part partition 110, that extend between area B and D.Hole 22 is opened on two area B and D.Hole 24 is arranged in the upstream side of intermediate hole 23, and at opposite side partition 110, broad ways.Hole 24 is in the neutral position of part partition 110, that extend between regional A and C.Hole 24 is opened on two regional A and C.These

holes

22,23 and 24 are arranged to have with the slit 21 of first embodiment's partition 10 effect of basic equivalence.

The present invention is to the not restriction of a plurality of holes as the connected part effect.The diameter in hole can be arranged to differ from one another by considering pressure distribution.And the number in hole is not restricted to three of present embodiment yet.More hole can be arranged on a plurality of lines.Second embodiment's gas exhaust manifold can play the effect identical with first embodiment.

The application is the No.2002-372510 of Japanese patent application formerly on December 24th, 2002 based on the applying date.Therefore, the whole contents of this Japanese patent application No.2002-372510 is incorporated herein by reference.

Although introduced the present invention with reference to specific embodiment of the present invention above, the present invention is not limited to the foregoing description.Those skilled in the art can know the variation and the change of the foregoing description according to above-mentioned instruction.Scope of the present invention will be determined with reference to following claim.

Claims

1. gas exhaust manifold, it is connected with the internal-combustion engine with four cylinders, and this gas exhaust manifold comprises:

Four branches (5,6,7,8) are used for discharging exhaust from four cylinders (#1, #2, #3, #4) respectively;

Downstream row tracheae (9), four branches of this downstream row tracheae and this are connected;

Partition (10; 110), this partition is divided into first passage (11) and second channel (12) with the exhaust passageway in the downstream row tracheae (9), and this first passage and second channel have semi-circular cross-section separately, described partition (10; 110) have otch (18), this notch shape is formed on the side on the width direction of this partition, and this width direction is perpendicular to the axial direction of downstream row tracheae (9);

In described first and second passages (11,12) each all with four branches (5,6,7,8) in two be connected, discontinuous two of ignition order is connected in these two branches and four cylinders (#1, #2, #3, #4), in four branches (5,6,7,8) two respectively with the semi-circular cross-section of each first and second passage (11,12) in first and second quadrant shape zone (A, the B; C, D) be communicated with;

Air-fuel ratio sensor (16), this air-fuel ratio sensor is installed on the downstream row tracheae (9), so that by partition (10; 110) otch (18) extend in first and second passages (11,12);

Connected part (21; 22,23,24), this connected part is formed at partition (10; 110) in, and make first and second passages (11,12) fluid communication with each other, this connected part (21; 22,23,24) has the (21A of first portion on the side that is positioned at described partition; 22) and be positioned at partition (10; 110) second portion (21B on the opposite side; 24), (21A of this first portion; 22) with respect to second portion (21B; 24) be positioned at the downstream side.

2. gas exhaust manifold according to claim 1, wherein: described connected part comprises slit (21), and this slit extends on the width direction of described partition (10), and tilts with respect to the axial direction of described downstream row tracheae (9).

3. gas exhaust manifold according to claim 2, wherein: described slit (21) has basic width uniformly on the direction vertical with the width direction of described partition (10).

4. gas exhaust manifold according to claim 1, wherein: described connected part comprises a plurality of holes (22,23,24), these holes comprise on the side that is positioned at described partition (10) and are positioned at hole (22) on the downstream side with respect to all the other holes (23,24).

5. gas exhaust manifold according to claim 4, wherein: these a plurality of holes (22,23,24) have essentially identical diameter.

6. according to any described gas exhaust manifold in the claim 1 to 5, wherein: the first quadrant shape zone (A, C) of each first and second passage (11,12) is positioned at described partition (10; 110) on the opposite side, the second portion (21B of described connected part; 24) be opened on this first quadrant shape zone (A, C).

7. gas exhaust manifold according to claim 6, wherein: each first and and the second quadrant shape zone (B, D) of second channel (11,12) be positioned at described partition (10; 110) on the side, (the 21A of first portion of connected part; 22) be opened on this second quadrant shape zone (B, D).

8. according to any described gas exhaust manifold in the claim 1 to 7, wherein: partition (10; 110) on the whole axial length of downstream row tracheae (9), extend.