CN100445527C

CN100445527C - Engine exhaust recirculating apparatus

Info

Publication number: CN100445527C
Application number: CNB2004100069037A
Authority: CN
Inventors: 塙薰
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2003-02-28
Filing date: 2004-02-26
Publication date: 2008-12-24
Anticipated expiration: 2024-02-26
Also published as: JP4119281B2; JP2004263599A; CN1526925A

Abstract

To use an exhaust recirculation control valve in a comparatively low temperature state in an exhaust recirculation control device having the exhaust recirculation control valve disposed in an exhaust recirculation passage connecting between an intake system connected to an intake port of an engine body and an exhaust port of the engine body. The engine body 11 is constructed in a liquid-cooled type to be cooled by circulation of cooling liquid, and the cooling liquid for cooling the exhaust recirculation control valve 81 is guided to the exhaust recirculation control valve 81.

Description

The engine exhaust recycling device

Technical field

The present invention relates to a kind of engine exhaust recycling device that EGR control valve is set in the exhaust gas recirculation passages that the relief opening with gas handling system and engine main body links to each other, this gas handling system is connected with the suction port of engine main body.

Background technique

For example, known a kind of exhaust gas re-circulation apparatus in patent document 1, wherein on the intermediate portion of exhaust gas recirculation passages EGR control valve is set, this exhaust gas recirculation passages is used for making part exhaust gas recirculatioon by the relief opening of engine main body to gas handling system.

[patent document 1]

JP-UM-B-61-43969

In above-mentioned technology, EGR control valve is installed on the cylinder block of motor.Yet, because motor is an air-cooled type, and in addition because EGR control valve is being installed near the relief opening on the cylinder block, the temperature of EGR control valve is elevated to a relatively large numerical value, needs to take measures to improve resistance to heat thus.In addition, in order to improve the efficient of waste-gas cleaning, the power type actuator that needs one of use to be used for EGR control valve improves the control performance of opening.Yet the temperature that is difficult in EGR control valve is elevated under the situation of an aforesaid higher relatively temperature value and uses this power type actuator.

Summary of the invention

In light of this situation, a problem to be solved by this invention provides a kind of engine exhaust recycling device, and wherein EGR control valve can be worked under the relatively low state of temperature.

In order to achieve the above object, first aspect of the present invention is a kind of engine exhaust recycling device, wherein on the exhaust gas recirculation passages of the relief opening that connects gas handling system and engine main body, an EGR control valve is set, this gas handling system is connected with the suction port of engine main body, wherein, engine main body is configured to the liquid cooled engine that can be cooled off by the circuit cooling liquid, and cooling liquid is guided to EGR control valve with the cooled exhaust gas recirculation control valve, the block jacket that is used for flowing through cooling liquid is arranged on the engine main body, and EGR control valve is installed on the outer wall of engine main body, so that cooled off by the cooling liquid from block jacket.

In the structure aspect first according to the present invention, because EGR control valve can be cooled off by cooling liquid, therefore can under the relatively low state of temperature, use EGR control valve, so it is not necessary improving the measure of resistance to heat, and the mode that can improve the control performance of opening by the power type actuator that utilizes EGR control valve improves the efficient of waste-gas cleaning.In addition, in such structure, EGR control valve directly is installed on the engine main body, can use under the relatively low state of temperature simultaneously, thereby can make the whole motor that comprises EGR control valve be configured to be of compact construction.

Except the structure of first aspect according to the present invention, according to a second aspect of the invention, EGR control valve comprises that the valve portion of an intermediate portion that can open and close exhaust gas recirculation passages and one are connected to the power type actuator that is used for the actuating valve part on the valve portion, and the part on the valve portion of the diversed side that is arranged on the power type actuator to valve casing of cooling liquid.In such structure, the excessive temperature ground that has prevented the valve portion of EGR control valve descends, with the activation of the waste gas of keeping recirculation, the transmission of heat that suppresses effectively simultaneously from valve portion to the power type actuator raises with the temperature of control power type actuator.

Except the structure of first aspect according to the present invention, according to third aspect of the present invention, the block jacket that is used for flowing through cooling liquid is arranged on the cylinder block of engine main body, and the part of described power type actuator side is installed on the outer wall of this block jacket bottom (outer end).

In structure according to third aspect of the present invention, do not have at EGR control valve under the situation of opening, the liquid cooling water jacket of cylinder block opens towards the outside by opening, and can easily form the liquid cooling water jacket thus when putting cylinder block.In addition, the excessive temperature that can prevent the valve portion of EGR control valve descends, so that keep the activation of the waste gas of recirculation, suppress simultaneously from valve portion to the transmission of heat the power type actuator rising effectively with the temperature of control power type actuator, in addition, can also simplify be used for the cooled exhaust gas recirculation control valve structure to improve its assembly performance.

Description of drawings

Fig. 1 is a kind of side view of motorcycle.

Fig. 2 is the side view of the part of motor.

The sectional view of Fig. 3 for intercepting along the line 3-3 among Fig. 2.

The sectional view of Fig. 4 for intercepting along the line 4-4 among Fig. 3.

The sectional view of Fig. 5 for intercepting along the line 5-5 among Fig. 3.

Embodiment

One embodiment of the present of invention according to expression in the accompanying drawings describe implementing mode of the present invention.

Fig. 1 to Fig. 5 represents one embodiment of the present of invention.Fig. 1 is a kind of side view of motorcycle; Fig. 2 is the side view of the part of motor; The sectional view of Fig. 3 for intercepting along the line 3-3 among Fig. 2; The sectional view of Fig. 4 for intercepting along the line 4-4 among Fig. 3; The sectional view of Fig. 5 for intercepting along the line 5-5 among Fig. 3.

In Fig. 1, motorcycle V comprises a front-wheel WF and the trailing wheel WR at rear vehicle at Vehicular body front, and this wheel WF rotatably is supported on the lower end of front fork 7, this front fork can by steering handle 6 left, turn right.Trailing wheel WR rotatably is supported on the rear end of swing arm 8, and this swing arm 8 is supported by car body, so as to make progress, to lower swing, and be provided with rear shock absorber 9 between swing arm 8 and the car body.

The Package power P that will be installed on the car body is arranged between front-wheel WF and the trailing wheel WR.Package power P comprises that a four-stroke liquid cooling direct jet-type petrol engine E with the cylinder-bore axis C that tilts to the front upper place and one are used for changing the gearbox M of the output speed of motor E, and the output of this gearbox M is delivered to trailing wheel WR by a chain (not shown).

In Fig. 2 to Fig. 4, the engine main body 11 of motor E comprises that a crankcase 12, one can be connected to the cylinder block 13 on the crankcase 12, the cylinder head 14 and the valve mechanism cover 15 that can be connected at the opposite side of cylinder block 13 on the cylinder head 14 that can be connected at the opposite side of crankcase 12 on the cylinder block 13, this engine main body 11 is installed on the motorcycle V, and cylinder head 14 1 sides are made progress slightly.

Piston 17 is assembled in the cylinder-bore 16 that is arranged on the cylinder block 13 slidably, this piston 17 is connected on bent axle 10 (not shown) that rotatably supported by crankcase 12 by connecting rod 18 and crank pin (not shown), and between cylinder block 13 and cylinder head 14, forms a firing chamber 19 that exposes the top of piston 17.

Cylinder head 14 comprises: a pair of intake valve port 20 ..., they lead to the end face of firing chamber 19; Common and these intake valve ports 20 ... the suction port 23 that is communicated with, it leads to the uper side surface of cylinder head 14; The single exhaust valve port 22 that is opened on the end face of firing chamber 19; One is communicated with and leads to the relief opening 24 of the downside surface of cylinder head 14 with exhaust valve port 22; And one be used for by pressurized air directly fuel injection to the firing chamber 19 oil sprayer 25, this oil sprayer 25 is arranged on the axis of cylinder-bore 16, promptly is arranged on the cylinder-bore axis C.

Spark plug 26 is installed on the cylinder head 14, so that removing intake valve port 20 ... with be exposed in the firing chamber 19 on other positions outside the exhaust valve port 22.

Cylinder head 14 comprises a pair ofly can open and close all intake valve ports 20 ... open and closable suction valve 27 ... and one can be opened and close opening and closable outlet valve 29 of exhaust valve port 22.

Suction valve 27 ... be assemblied in the guiding cylinder 30 that is individually fixed on the cylinder head 14 slidably ... on, valve spring 32 ... be arranged at and be separately fixed at from guiding cylinder 30 ... positioning work piece 31 on the end of the suction valve 27 that stretches out ... and between the cylinder head 14, suction valve 27 ... on the direction of cut-off valve by by valve spring 32 ... the spring force that applies promotes.Outlet valve 29 is assemblied in the guiding cylinder 33 that is fixed on the cylinder head 14 slidably, and valve spring 35 is arranged between positioning work piece 34 and the cylinder head 14, and this positioning work piece 34 and cylinder head 14 all are fixed on the end of the outlet valve 29 that stretches out from guiding cylinder 33.Outlet valve 29 is promoted by the spring force that applies by valve spring 35 on the direction of cut-off valve.

The air inlet side pitman arm shaft 36 and the exhaust side pitman arm shaft 37 that are parallel to the axis extension of bent axle are supported by valve mechanism cover 15, and abut against suction valve 27 with air inlet side first rocking arm 38 that the mode that can pivot supports by air inlet side pitman arm shaft 36 ... the end, exhaust side first rocking arm 39 that is supported in the mode that can pivot by exhaust side pitman arm shaft 37 abuts against the end of outlet valve 29.

On the other hand, the two ends that are parallel to the camshaft 41 that air inlet side pitman arm shaft 36 and exhaust side pitman arm shaft 37 extend are rotatably supported by cylinder block 13 and the lid 40 that is fixed on the cylinder block 13 by ball bearing 42,43, be used for the cam chain 45 that reduces to half from the rotating power of bent axle and transmit the power that has reduced is wrapped in the driven sprocket 44 that is installed on the camshaft 41, so that do not relatively rotate mutually.

Air inlet side cam 46 and exhaust side cams 47 all are fixed on the camshaft 41, and are all supported in the mode that can pivot by cylinder block 13 by the air inlet side second rocking arm (not shown) of air inlet side cam 46 drivings and exhaust side second Rocker arm 49 that is driven by exhaust side cams 47.The pivot movement of air inlet side second rocking arm passes to air inlet side first rocking arm 38 by air inlet thruster bar 50, and the pivot movement of exhaust side second Rocker arm 49 passes to exhaust side first rocking arm 39 by exhaust side push rod 51.

Oil sprayer 25 is by compressed air pump 54 supply pressurized air, this compressed air pump 54 has the operative axis that a cylinder-bore axis C who is parallel to engine main body 11 extends and is installed on the lower wall of cylinder block 13, and power passes to compressed air pump 54 from camshaft 41.

In other words, drive sprocket 55 forms with the driven sprocket 44 that is installed on the camshaft 41, so that do not relatively rotate mutually, and power is delivered on the compressed air pump 54 by the endless chain 56 that is wrapped on the drive sprocket 55.Like this, compressed air pump 54 is the Reciprocatory compressed air pump with the operative axis that is parallel to cylinder-bore axis C extension, and is converted into the to-and-fro motion of compressed air pump 54 by the crank mechanism (not shown) from the rotating power that endless chain 56 transmits.

Oil sprayer 25 comprises: an air-fuel injection valve 58, and it has one and stretches in the firing chamber 19 and be installed to nozzle 57 on the cylinder head 14; And a fuel injection valve 59, it is connected on air-fuel injection valve 58, so that inject fuel into air-fuel injection valve 58 from the rear.Air-fuel injection valve 58 directly is ejected into fuel oil and pressurized air in the firing chamber 19 together.

Cylinder head 14 comprises: a pilot hole 60, nozzle 57 is installed on it airtightly; And one inserted cylinder 61, and it has greater than the internal diameter of pilot hole 60 and with pilot hole 60 and continues coaxially, both all with the coaxial setting of cylinder-bore axis C.Air-fuel injection valve 58 is planted to and is inserted in the cylinder 61, in nozzle 57 is packed into pilot hole 60 airtightly and abut against the annular shaft shoulder 62, this annular shaft shoulder 62 is at pilot hole 60 and insert between the cylinder 61 and form, and is intermediate with wavy spring packing ring 63.

On the other hand, valve mechanism cover 15 is made an integral body with columniform nozzle holder 64, thereby when valve mechanism cover 15 and cylinder head 14 are combined, the end of nozzle holder 64 abuts against the rear end of air-fuel injection valve 58, described cylindrical nozzle holder 64 is assemblied on the fuel injection valve 59 and is keeping this valve, clamps air-fuel injection valve 58 with respect to cylinder head 14 simultaneously.Be used for being fixed on the rear end of nozzle holder 64 with respect to the clamping plate 65 of the rear end of nozzle holder 64 clamping fuel injection valves 59.

And the annular fuel oil chamber 66 of the internal communication of fuel injection valve 59 forms between nozzle holder 64 and fuel injection valve 59, and a pair of being used for plants fuel injection valve 59 and the nozzle holder 64 from the

sealing component

67,68 of sandwich annular fuel oil chamber 66.In addition, valve mechanism cover 15 is provided with a supplying fuel passage 69 that is communicated with annular fuel oil chamber 66, and the fuel oil that is adjusted to constant pressure is fed in the annular fuel oil chamber 66 by supplying fuel passage 69.

The annular air casing 70 that is communicated with air-fuel injection valve 58 forms between the rear end of the far-end of fuel injection valve 59 and air-fuel injection valve 58 and nozzle holder 64.Pressurized air from compressed air pump 54 is supplied in the annular air casing 70.

Engine main body 11 is configured to the liquid cooling that can cool off by the recirculation cooling liquid.Be used for distributing the

block jacket

71,72 of cooling liquid to be separately positioned on the cylinder block 13 and cylinder head 14 of engine main body 11.The gas handling system 74 that comprises suction tude 73 is connected on the suction port 23 of cylinder head 14, and the downstream of the outlet pipe 75 that links to each other with the relief opening 24 of cylinder head 14 is connected to and will be set on the exhaust silencer 76 on right side of trailing wheel WR.

Part waste gas by relief opening 24 passes through exhaust gas recirculation passages 80 towards gas handling system 74 recirculation, and EGR control valve 81 is arranged on the intermediate portion of exhaust gas recirculation passages 80.

A top recirculation line 80a of exhaust gas recirculation passages 80 is between EGR control valve 81 and relief opening 24, this passage 80a is limited in the upstream line 82, this upstream line 82 is arranged between cylinder head 14 and the EGR control valve 81, and the downstream line 80b between EGR control valve 81 and gas handling system 74 of exhaust gas recirculation passages 80 is limited in the downstream line 83, and this downstream line 83 is arranged between the suction tude 73 and EGR control valve 81 of gas handling system 74.

With reference to accompanying drawing 5, EGR control valve 81 comprises equally: a valve portion 84, and it can open and close the intermediate portion of exhaust gas recirculation passages 80; A power type actuator 85, it is used for driving connected valve portion 84, by being arranged on the cooling liquid of the

block jacket

71,72 on the engine main body 11, especially the cooling liquid of the block jacket 71 of the cylinder block 13 of process engine main body 11 is diversed to the EGR control valve 81 that is installed on the cylinder block 13, so that cool off this EGR control valve 81.

The valve portion 84 of EGR control valve 81 comprises: a valve casing 86, the valve seat member 87 that will be fixed in the valve casing 86, the valve body 88 that can be placed on the valve seat member 87, and one be used for producing elastic force so that 88 of valve bodies are gone into the return spring 89 on the valve seat member 87.

Valve casing 86 is made into the cylindrical shape that the shaft shoulder is arranged that has a partition part 86a along axial direction in the intermediate portion office.The opening that is arranged in an end along axial direction is by being screwed into valve casing 86 to cover piece 90 and sealing with fluid-tight fashion.Valve seat member 87 is fixed on the valve casing 86, so that plant between shaft shoulder 86b and the back-up ring 91, this shaft shoulder 86b is arranged on exposing of valve casing 86 on the internal surface between partition part 86a and the cover piece 90 and towards cover piece 90, this back-up ring 91 is installed on the internal surface of valve casing 86 and at one end engages with the outer periphery of valve seat member 87.In addition, upstream valve chamber 92 is located in the valve casing 86 between valve seat member 87 and cover piece 90, and downstream valve body 93 is located between valve seat member 87 and the partition part 86a.

By valve body 88 being placed in the center of the valve seat member 87 that is arranged in upstream valve chamber 92, valve body 88 can be blocked between upstream valve chamber 92 and the downstream valve chamber 93, and integrally is arranged at an end of valve shaft 94, and this valve shaft passes the center of valve seat member 87 loosely.Valve shaft 94 passes partition part 86a, so that can move along axial direction, and the cylindrical guide member 95 with the outer periphery sliding contact of valve shaft 94 is contained in the opening of partition part 86a, so that the motion of guiding valve shaft 94 and prevent that gas from leaking from downstream valve chamber 93.

Positioning work piece 96 is installed on the other end of valve shaft 94, and return spring 89 is arranged under contraction state between the spring containing seat 97 and positioning work piece 96 that is held by partition part 86a.

Power type actuator 85 be configured to can be for example output by stepper motor make live axle 98 actions, this live axle 98 along the axial direction coaxial line be resisted against on the other end of valve shaft 94, the housing 99 of power type actuator 85 is connected on the other end of valve casing 86, so that be formed for holding the spring housing 100 of return spring 89 with respect to baffle chamber 86a.

Like this, the exhaust flow flux between upstream valve chamber 92 and downstream valve chamber 93 can be controlled by following manner, that is, the elastic force ground of resisting return spring 89 by the operation of power type actuator 85 along axial direction drives valve shaft 94.

The upstream extremity of the upstream line 82 of the upstream recirculation line 80a of formation exhaust gas recirculation passages 80 is inserted in the cylinder head 14, so that be connected with relief opening 24, and have a ring sealing part 101 with respect to cylinder head 14 therebetween, sealing parts 101 are by screwing in the cylindrical retaining member 102 round the upstream extremity of upstream line 82 and be fastened in the cylinder head 14 clamping securely and being sealed in thus between upstream line 82 and the cylinder head 14.Therefore, the upstream extremity of upstream line 82 can slide along axial direction, and is connected to airtightly on the cylinder head 14.

The downstream of upstream line 82 is screwed in the valve casing 86 of EGR control valve 81, so that the downstream of upstream recirculation line 80a is connected with upstream valve chamber 92, and ring sealing part 103 is planted between valve casing 86 and the upstream line 82.

The downstream line 83 that forms the downstream recirculation line 80b of exhaust gas recirculation passages 80 is provided with a flange 83a at its upstream end, this flange 83a is fixed on the valve casing 86 by pair of bolts 104,104, so that the upstream extremity of downstream recirculation line 80b is connected with downstream valve chamber 93.Downstream line 83 is provided with a flange 83b in downstream, and the downstream of downstream recirculation line 80b is connected with the inside of suction tude 73 by flange 83b, and this flange 83b is by a plurality of bolts 105 ... be fixed on the suction tude 73 of gas handling system 74.

Its internal surface of cylinder block 13 is formed with an opening 106 that is connected with block jacket 71 facing to the outer wall of block jacket 71, and is provided with a mounting portion 107 around opening 106.EGR control valve 81 is by a plurality of, and for example pair of bolts 108,108 is installed on the mounting portion 107, so that close opening 106 by the part on the side of power type actuator 85 of valve casing 86.

In other words, form an integral body corresponding to the flange 110 of mounting portion 107 and the part corresponding to spring housing 100 of valve chest 86, and comprise that a flange 110 with respect to the packing ring 109 of mounting portion 107 insertions is fixed on the mounting portion 107 by bolt 108,108.Thereby valve casing 86 or EGR control valve 81 are installed on the cylinder block 13, so that close opening 106 by the flange 110 of valve casing 86.

In addition, flange 110 is provided with an open pore 111 that communicates with spring housing 100 and one at open pore 111 be used for making open pore 111 to lead to the groove 112 that forms a passage between the outside packing ring 109.

Below, will the operation of present embodiment be described.Because cooling liquid is directed to the EGR control valve 81 that is arranged in the exhaust gas recirculation passages 80, and this exhaust gas recirculation passages 80 connects the suction tude 73 of gas handling system 74 and the relief opening of engine main body 11, wherein said suction tude 73 links to each other with the suction port 23 of the liquid cooled engine main body 11 that can cool off by the recirculation cooling liquid, EGR control valve 81 can be cooled off by cooling liquid thus, so EGR control valve 81 can use under the relatively low state of temperature.Therefore, the resistance to heat of needn't taking measures to improve, and the mode that can strengthen the may command performance of opening by the power type actuator 85 that utilization is used for EGR control valve 81 improves the efficient of waste-gas cleaning.

In addition, because EGR control valve 81 is installed on the outer wall of cylinder block 13, so that by cooling off from the cooling liquid of the block jacket 71 on the cylinder block 13 that is arranged at engine main body 11, EGR control valve 81 can be directly installed on the cylinder block 13 of engine main body 11, and can use this valve simultaneously under the relatively low state of temperature, thereby the whole motor E that comprises EGR control valve 81 can be constructed to be of compact construction.

Because EGR control valve 81 comprises the valve portion 84 of the intermediate portion that can open and close exhaust gas recirculation passages 80 and is connected to the power type actuator 85 that is used for actuating valve part 84 on the valve portion 84, and the side at power type actuator 85 that will be directed to valve casing 86 from the cooling liquid of block jacket 71 is arranged on the part on the valve portion 84, the excessive temperature that can prevent the valve portion 84 of EGR control valve 81 descends, to keep the activation of EGR gas, the transmission of heat that suppresses effectively simultaneously from valve portion 84 to power type actuator 85 is risen with the temperature of controlling power type actuator 85.

Have towards the outer wall of the cylinder block 13 of the internal surface of block jacket 71 and be provided with opening 106, this opening 106 and block jacket 71 and be connected around the mounting portion 107 of opening 106, EGR control valve 81 is installed on the mounting portion 107, thereby the part on the valve portion 84 that opening 106 is arranged at by the side at power type actuator 85 of valve casing 86 is closed.

In other words, under EGR control valve 81 was not contained in wherein state, the liquid cooling water jacket 71 of cylinder block 13 led to the outside by opening 106, can form liquid cooling water jacket 71 at an easy rate thus when packing cylinder block 13 into.

In addition, can simplify be used for cooled exhaust gas recirculation control valve 81 structure to improve its assembly performance.

Although so far embodiments of the invention are described, the present invention is not limited thereto, can carry out various modifications under not breaking away from by the prerequisite of the described scope of the present invention of claims in design.

As mentioned above, according to claim 1, because EGR control valve can be by cooling Liquid cooling but and can be used exhaust gas recirculatioon control thus under the relatively low state of temperature Valve need not take measures to improve heat resistance, and can be used for exhaust gas recirculatioon by utilizing The mode that the power type actuator of control valve improves the control performance of opening improves waste gas purification Efficient.

According to claim 2, EGR control valve can be directly installed on engine main body On, can under the relatively low state of temperature, use simultaneously, comprise that exhaust is again thereby can make Circulation control valve is of compact construction at interior whole engine.

According to claim 3, can prevent the excessive temperature of the valve portion of EGR control valve Decline suppresses to cause from the valve portion to the power type simultaneously to keep the activation of EGR gas effectively The heat of moving device conducts to control the rising of the temperature of power type actuator.

According to claim 4, can when packing cylinder block into, form at an easy rate the liquid-cooled water jacket. The excessive temperature that in addition, can prevent the valve portion of exhaust cycle control valve descends to keep recirculation The activation of waste gas suppresses to conduct to control to the heat of power type actuator from valve portion simultaneously effectively The rising of the temperature of power type actuator processed in addition, can be simplified for the cooled exhaust gas recirculation control The structure of valve processed is to improve its assembly performance.

Claims

1. engine exhaust recycling device, be included in the EGR control valve (81) that is provided with in the exhaust gas recirculation passages (80) of the relief opening (24) that connects gas handling system (74) and engine main body (11), described gas handling system is connected on the suction port (23) of engine main body (11), it is characterized in that, engine main body is configured to the liquid cooling that can cool off by the recirculation cooling liquid, and cooling liquid is directed to EGR control valve (81), to cool off this EGR control valve (81), be used for flowing through the block jacket (71 of cooling liquid, 72) be arranged on the engine main body (11), and EGR control valve (81) is installed on the outer wall of engine main body (11), so that by from block jacket (71,72) cooling liquid is cooled off; Engine main body (11) has the cylinder block (13) that has block jacket (71), this cylinder block (13) is provided with the opening (106) that is communicated with block jacket (71), on the opening (106) of this cylinder block (13) EGR control valve (81) is installed.

2. engine exhaust recycling device according to claim 1, it is characterized in that, EGR control valve (81) comprises a valve portion (84) and a power type actuator (85), described valve portion can open and close the intermediate portion of exhaust gas recirculation passages (80), described power type actuator is connected to valve portion (84) and goes up and be used for actuating valve part (84), and the cooling liquid side at power type actuator (85) that is directed into valve casing (86) is arranged at the part on the valve portion (84).