CN1332130C

CN1332130C - Four-stroke direct jet engine

Info

Publication number: CN1332130C
Application number: CNB031594549A
Authority: CN
Inventors: 塙薰
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2002-09-27
Filing date: 2003-09-25
Publication date: 2007-08-15
Anticipated expiration: 2023-09-25
Also published as: FR2845133A1; JP4030402B2; ITTO20030739A1; FR2845133B1; CN1493782A; JP2004116447A

Abstract

The injection valve 108 for directly injecting the fuel into the combustion chamber 19 is inserted into the cylinder head 14 from a head cover 15 side. A positioning part 114 for positioning the injection valve 108 with respect to the cylinder head 14 is installed in the head cover 15.

Description

The four-stroke direct fuel-injection engine

Technical field

The present invention relates to inject fuel directly into the four-stroke direct fuel-injection engine of firing chamber.

Background technique

Originally, in relevant four-stroke direct fuel-injection engine, used for example disclosed injection valve in patent documentation 1.

[patent documentation 1]

No. 2765761 communique of patent

But, in above-mentioned original article, the injection valve of auxiliary (the worker アアシス fore-telling) usefulness of the injection valve of burner oil and air is arranged side by side, be installed on the valve body, when being installed to injection valve on the cylinder cap, injection valve need be installed to valve body, and valve body is installed to cylinder cap, it is miscellaneous that installation exercise becomes.

The present invention is exactly in view of relevant situation, is the 1st purpose so that a kind of four-stroke direct fuel-injection engine to be provided, and this motor has improved the installation exercise when being installed on the cylinder cap to the injection valve that injects fuel directly into the firing chamber.

In addition, carry out spraying because be based on the auxiliary fuel of air, so in above-mentioned original article, needing will be by disposing two injection valves side by side, and bigger valve body is installed on the cylinder cap, and installation exercise is not only miscellaneous, and number of components is also many, simultaneously also need on cylinder cap, guarantee bigger installing space, cause the maximization of motor.

The present invention is exactly in view of relevant situation, is the 2nd purpose so that a kind of four-stroke direct fuel-injection engine to be provided, and when this motor sprays at the fuel that carries out assisting based on air, can improve the operation of installation, reduces part count and makes the cylinder cap miniaturization.

Summary of the invention

For reaching above-mentioned the 1st purpose, the described invention of claim 1, be in injecting fuel directly into the four-stroke direct fuel-injection engine of firing chamber, it is characterized in that, the injection valve that injects fuel directly into the firing chamber inserts cylinder cap from the cylinder head cover side, with respect to above-mentioned cylinder cap,, be arranged on the above-mentioned cylinder head cover the positioning part that this injection valve positions.

Formation according to the described invention of such claim 1, the injection valve that injects fuel directly into the firing chamber, insert cylinder cap from the cylinder head cover side, only by cylinder head cover is attached on the cylinder cap, just can be with respect to cylinder cap, above-mentioned injection valve is positioned, and the operation that injection valve is installed on the cylinder cap becomes easily, can improve installation exercise.

In addition, for reaching above-mentioned the 2nd purpose, the described invention of claim 2, be in injecting fuel directly into the four-stroke direct fuel-injection engine of firing chamber, it is characterized in that, the 1st injection valve of burner oil is installed on the cylinder head cover, for inject fuel directly into above-mentioned firing chamber with pressurized air, is installed on the above-mentioned cylinder cap with coaxial the 2nd injection valve that links to each other of the 1st injection valve.

Formation according to the described invention of such claim 2, when the fuel that carries out assisting based on air sprays, because as long as successively the 1st and the 2nd injection valve is installed on cylinder head cover and the cylinder cap,, also can reduce the quantity of parts in addition so that installation exercise can not become is miscellaneous.And, because as long as the space of guaranteeing to install the 2nd injection valve on cylinder cap so compare with original article, promptly is installed on the cylinder cap with the valve body that two injection valves will be installed and compares, the installing space that to guarantee by cylinder cap can be dwindled, the miniaturization of cylinder cap can be expected.

The described invention of claim 3, require at aforesaid right on the formation of 2 described inventions, it is characterized in that, above-mentioned the 1st injection valve is chimeric and maintenance with the sparger shell that is arranged on the tubular on the cylinder head cover, above-mentioned the 2nd injection valve is inserted into above-mentioned cylinder cap, is clamped in simultaneously between the front end and cylinder cap of above-mentioned sparger shell, according to relevant formation, the 2nd injection valve is installed to becomes on the cylinder cap easily, can further improve installation.

The described invention of claim 4, require at aforesaid right on the formation of 2 or 3 described inventions, it is characterized in that, the distribution that above-mentioned the 1st injection valve is had closes on the outside of cylinder head cover with joint, the 1st injection valve is installed on the cylinder head cover, the lead that links to each other with above-mentioned the 2nd injection valve connects the liner that is clipped between cylinder cap and the cylinder head cover, pulled into the outside, according to relevant formation, the 2nd injection valve is installed on the cylinder cap, simultaneously under the state of the interspersed grommet of the extended lead of the 2nd injection valve, cylinder head cover is attached on the cylinder cap, and then, just can finish the installation that comprises to the distribution of two injection valves by the 1st injection valve is installed on the cylinder head cover, can further improve installation.

Further, the described invention of claim 5, require at aforesaid right on the formation of 2 or 3 described inventions, it is characterized in that, form air chamber between the above-mentioned the 1st and the 2nd injection valve in above-mentioned sparger shell, this air chamber stores the pressurized air that imports to the 2nd injection valve, according to relevant formation, can be used in a part that pressurized air is imported to the pressurized air supply structure of the 2nd injection valve, by sparger shell dual-purpose.

Description of drawings

Fig. 1 is that the vertical profile of the part of motor is looked side view.

Fig. 2 is a 2-2 alignment view of pulling down Fig. 1 of cylinder head cover state.

Fig. 3 is the 3-3 line sectional view of Fig. 2.

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

Fig. 5 is the 5-5 line sectional view of Fig. 4.

Fig. 6 is the expansion sectional view along the cylinder cap of the 6-6 line of Fig. 2.

Fig. 7 is the 7-7 line sectional view of Fig. 2.

Fig. 8 is the 8-8 line sectional view of Fig. 7.

Fig. 9 is the 9-9 line sectional view of Fig. 7.

Figure 10 looks side view along the vertical profile of the motor of the 10-10 line of Fig. 2.

Embodiment

Below, the one embodiment of the present of invention shown in illustrate embodiments of the present invention with reference to the accompanying drawings.

Fig. 1-Figure 10 represents one embodiment of the present of invention, Fig. 1 is that the vertical profile of the part of motor is looked side view, Fig. 2 is a 2-2 alignment view of pulling down the Fig. 1 under the cylinder head cover state, Fig. 3 is the 3-3 line sectional view of Fig. 2, Fig. 4 is the 4-4 line sectional view of Fig. 3, Fig. 5 is the 5-5 line sectional view of Fig. 4, Fig. 6 is the expansion sectional view along the cylinder cap of the 6-6 line of Fig. 2, Fig. 7 is the 7-7 line sectional view of Fig. 2, Fig. 8 is the 8-8 line sectional view of Fig. 7, Fig. 9 is the 9-9 line sectional view of Fig. 7, and Figure 10 looks side view along the vertical profile of the motor of the 10-10 line of Fig. 2.

At first, in Fig. 1, engine main body 11 as the water-cooled single cylinder direct fuel-injection engine of the four-stroke of head valve formula has crankcase 12, the cylinder body 13 that combines with this crankcase 12, reverse side at above-mentioned crankcase 12, the cylinder cap 14 that combines with cylinder body 13, in the reverse side of cylinder body 13, the cylinder head cover 15 that combines with cylinder cap 14, with the posture of cylinder cap 14 sides, be equipped on the vehicle of two-wheeled motor vehicle etc. slightly to go up forward.

Comprehensively with reference to Fig. 2 one Fig. 4, can be entrenched in the piston 17 of the cylinder barrel 16 that is arranged on the cylinder body 13 slidably, between connecting rod 18 and crankpin (not having diagram), be attached on the bent axle 10 (with reference to Fig. 1), this bent axle 10 can support by crankcase 12 with rotating freely, between cylinder body 13 and cylinder cap 14, form firing chamber 19, make it to close on the top of this piston 17.

On cylinder cap 14, the independent opening of an end on the roof 19a of firing chamber 19, make the common binding of the other end simultaneously, be set up in parallel the 1st and the 2nd suction port 20,21 at the upper side opening of cylinder cap 14, be arranged on the last end opening of roof 19a of firing chamber 19 simultaneously, the other end is at the relief opening 22 of the lower side opening of cylinder cap 14 simultaneously.

Opening end to the firing chamber 19 of the 1st and the 2nd suction port 20,21 opens and closes by the 1st and the

2nd intake valve

27,28 respectively, and the opening end to the firing chamber 19 of relief opening 22 opens and closes by exhaust valve 29.Promptly on cylinder cap 14, can carry out on-off action and dispose the

whole intake valve

27,28 and the exhaust valve 29 of odd number that be, the the 1st and the

2nd intake valve

27,28 is fitted to the guide 30 that is fixed on the cylinder cap 14 respectively slidably ... on, be individually fixed in from guide 30 ... the oil thrower 31 of the upper end portion of two

outstanding intake valves

27,28 ... and between the cylinder cap 14, valve spring 32 is set respectively ... by these valve spring 32 ... the elastic force of being brought into play, two

intake valves

27,28 are energized to closing the valve direction.In addition, exhaust valve 29 is chimeric slidably with the guide 33 that is fixed on the cylinder cap 14, between the oil thrower 34 and cylinder cap 14 of the upper end portion of being fixed in the exhaust valve of giving prominence to from guide 33 29, valve spring 35 is set, by the elastic force that this valve spring 35 is brought into play, exhaust valve 29 is energized to closing the valve direction.

And, the action axis of two

intake valves

27,28, i.e. two guides 30 ... axis intersect with the axis normal of bent axle 10, on the projection drawing of the imaginary plane that comprises said cylinder axis C, overlapped configuration arranged side by side, the action axis of two

intake valves

27,28 and the action axis of exhaust valve 29, it is the axis of guide 33, on the projection drawing of above-mentioned imaginary plane, be V word shape, two

intake valves

27,28 and exhaust valve 29 are configured on the cylinder cap 14 with can carrying out on-off action.

But, to with the projection drawing on the plane of cylinder axis C square crossing on, both sides at said cylinder axis C, dispose the 1st suction port 20 and relief opening 22, omiting on another straight line L2 of square crossing with the straight line L1 that links the 2nd suction port 21 and relief opening 22, in the side of cylinder axis C, dispose the 1st suction port 20 side by side with the 2nd suction port 21.In addition, with corresponding along distolateral the 1st suction port 20 two suction ports 20,21 and column direction, simultaneously in that there is the position of displacement at 19 center from the firing chamber, compare with

intake valve

27,28, in the position arranged side by side with the few side's of quantity exhaust valve 29, spark plug 26 is installed on cylinder cap 14, is made it to close on firing chamber 19.

On firing chamber 19, axis with cylinder barrel 16, promptly parallel axis with cylinder axis C, between above-mentioned two

intake valves

27,28 and exhaust valve 29, by being provided in the sparger 25 on the cylinder cap 14, direct fuel injection, in this embodiment, C is coaxial with cylinder axis, and sparger 25 is provided on the cylinder cap 14.

Be sparger 25, a pair of suction port 20,21, the relief opening 22 corresponding with the 2nd suction port 21, spark plug 26 is provided on the cylinder cap 14, and by two suction ports 20,21, relief opening 22 and spark plug 26 surround spargers 25.

In Fig. 5, around the opening end of firing chamber 19 in being disposed at the 1st and the 2nd suction port 20,21 mutually arranged side by side and the 2nd suction port 21 that column direction one is distolateral, on the roof 19a of firing chamber 19, flow into the air inlet of firing chamber 19 from the 2nd suction port 21, the circuitous open fire plug 26 that is positioned at the 1st suction port 20 corresponding positions that circulates in is provided with the guide wall 142 that leads.

Comprehensively with reference to Fig. 6, on the central part of the face that faces firing chamber 19 of piston 17, cavity 143 is set.In addition, on the roof 19a of firing chamber 19, form to the side-prominent protuberance 144 of piston 17, spark plug 26 is installed on the cylinder cap 14, from protuberance 144 to the outstanding front-end configuration in firing chamber 19 below comparing with the front end of sparger 25.And above-mentioned cavity 143 forms dark more to above-mentioned spark plug 26 sides more.

Further, comprehensively with reference to Fig. 7-Fig. 9, the 1st and the

2nd intake valve

27,28 and exhaust valve 29 carries out driven for opening and closing by valve gear 38, and this valve gear 38 possesses and has: air inlet side and

exhaust side cams

39,40 are arranged and the camshaft 41 of rotation; Air inlet side the 1st Rocker arm 42 that is driven in above-mentioned air inlet side cam 39 and shakes; Exhaust side the 1st Rocker arm 43 that is driven in above-mentioned exhaust side cams 40 and shakes; Air inlet side the 2nd Rocker arm 44, this air inlet side the 2nd Rocker arm 44 at one end side have a pair of pushing wrist 44a that contacts with the 1st and the

2nd intake valve

27,28,44b; Exhaust side the 2nd Rocker arm 45, this exhaust side the 2nd Rocker arm 45 at one end side has the pushing wrist 45a that contacts with exhaust valve 29; Air inlet side drive bar 46, this air inlet side drive bar 46 are arranged between air inlet side the 1st and the 2nd Rocker

arm

42,44, and the swing movement of air inlet side the 1st Rocker arm 42 is delivered on air inlet side the 2nd Rocker arm 44; Exhaust side driveshaft 47, this exhaust side driveshaft 47 are arranged between exhaust side the 1st and the 2nd Rocker arm 43,45, and the swing movement of exhaust side the 1st Rocker arm 43 is delivered on exhaust side the 2nd Rocker arm 45.

Between cylinder cap 14 and cylinder head cover 15, form the 1st valve cage 48, the 1 valve cages 48 and take in and dispose: air inlet side in the above-mentioned valve gear 38 and exhaust side the 2nd Rocker

arm

44,45; Shake the air inlet side and exhaust side the

2nd camshaft

58,59 of pivot Zhi Jinqi side and exhaust side the 2nd Rocker

arm

44,45; And the top of air inlet side and

exhaust side driveshaft

46,47, at crankcase 12, on cylinder body 13 and the cylinder cap 14, form the 2nd valve cage 49, the 2nd valve cage 49 is taken in the nubbin of valve gear 38, relevant cylinder axis C extends in parallel at the opposition side and the cylinder axis C of above-mentioned spark plug 26 sides of configuration.

For the part in lubricated the 1st valve cage 48 that is accommodated in the above-mentioned valve gear 38, machine oil spraying hole 36 is set on cylinder head cover 15, the lubricated machine oil that is accommodated in the part in the 1st valve cage 48, through the 2nd valve cage 49, turn back to the oil sump 12a (with reference to Fig. 1) of the bottom that is formed at crankcase 12.

Air inlet side and exhaust side the 1st Rocker arm 42,43, has

roller

54,55 respectively, this

roller

54,55 rolls with air inlet side and

exhaust side cams

39,40 from cylinder cap 14 sides and contacts, have the axis parallel, can joltily support by the air inlet side and exhaust side the 1st camshaft 56,57 that are arranged at cylinder body 13 and cover between 50 with above-mentioned camshaft 41.On these air inlet sides and exhaust side the 1st Rocker arm 42,43, be wholely set the 42a of pushing portion respectively, 43a, the 42a of this pushing portion, 43a is bowl-shape, is positioned at the opposition side of above-mentioned

roller

54,55, opens to cylinder cap 14 sides.

Camshaft 41 in the valve gear 38 is configured on the cylinder body 13, be accommodated in the 2nd valve cage 49, the two end part of camshaft 41 with axis parallel with bent axle 10 are between ball bearing 51,51, can be supported on cylinder body 13 and for forming the outer side surface of the 2nd valve cage 49 with rotating freely, and conclude on the cover 50 of cylinder body 13.

And, on camshaft 41, air inlet side and

exhaust side cams

39,40 and engine oil supplying road 37 are set, the machine oil that this engine oil supplying road 37 is used to supply with lubricated usefulness to the sliding contacting part of air inlet side the 1st Rocker arm 42 and exhaust side the 1st Rocker arm 43.

In the 2nd valve cage 49, for being slowed down with 1/2, transmits the power from bent axle 10, taken in the 1st driven sprocket 52, the cam chain 53 of the 1st drive sprocket 60 (with reference to Fig. 1) and circulation shape, the 1st driven sprocket 52 can not be incorporated into camshaft 41 with relatively rotating, the 1st drive sprocket 60 can not be incorporated into bent axle 10 with relatively rotating, and cam chain 53 lash are on the 1st drive sprocket 60 and the 1st driven sprocket 52.

Air inlet side and

exhaust side driveshaft

46,47 stride across between the part in the 2nd valve cage 49 from the 1st valve cage 48 and extend, for making narrow configuration the in space of cylinder cap 14 sides.One distolateral balled end of the

driveshaft

46,47 of air inlet side and exhaust side can be unsteadily and the 42a of pushing portion of air inlet side and exhaust side the 1st Rocker

arm

42,43,43a is chimeric, another distolateral balled end of the

driveshaft

46,47 of air inlet side and exhaust side can be unsteadily and the compression zone 44c of air inlet side and exhaust side the 2nd Rocker

arm

44,45, and 45b is chimeric.

In the 1st valve cage 48, air inlet side and exhaust side the 2nd camshaft 58 with axis parallel with

camshaft

41,59 support fixation are on cylinder cap 14, be configured in the both sides of above-mentioned sparger 25, by with the 1st and the

2nd intake valve

27,28 last end in contact, and with two

intake valves

27,28 link synchronously, one distolateral have be divided into 2 forked a pair of pushing wrist 44a, air inlet side the 2nd Rocker arm 44 of 44b, by air inlet side the 2nd pitman arm shaft 58, can freedom joltily support, by with the last end in contact of exhaust valve 29, one distolateral exhaust side the 2nd Rocker arm 45 with the pushing wrist 45a that links synchronously with this exhaust valve 29, by exhaust side the 2nd pitman arm shaft 59, can freedom joltily support.

And, about air inlet side the 2nd pitman arm shaft 58, at two pushing wrist 44a, the opposition side of 44b on the other end of air inlet side the 2nd Rocker arm 44, is wholely set the bowl-shape compression zone 44c to cylinder body 13 side openings, about exhaust side the 2nd pitman arm shaft 59, opposition side at pushing wrist 45a on exhaust side the 2nd Rocker arm 45, is wholely set the bowl-shape compression zone 45b to cylinder body 13 side openings.

The other end of above-mentioned air inlet side and exhaust side the 2nd Rocker

arm

44,45, be compression zone 44c, 45b is configured between the end of air inlet side and exhaust side the 2nd

pitman arm shaft

58,59, air inlet side and

exhaust side driveshaft

46,47 are linked to the other end of air inlet side and exhaust side the 2nd Rocker

arm

44,45 synchronously between an end of air inlet side and exhaust side the 2nd

pitman arm shaft

58,59.

In such valve gear 38, with with 1/2 reduction speed ratio, transmission is corresponding from the rotation of the camshaft 41 of the rotating power of bent axle, by shake air inlet side the 1st Rocker arm 42 by air inlet side cam 39, make air inlet side drive bar 46 in its axle direction action, corresponding, shake by air inlet side the 2nd Rocker arm 44, driven for opening and closing the 1st and the

2nd intake valve

27,28, in addition, by shake exhaust side the 1st Rocker arm 43 by exhaust side cams 40, make exhaust side driveshaft 47 in its axle direction action, corresponding, by shaking exhaust side the 2nd Rocker arm 45, driven for opening and closing exhaust valve 29.

But, in sparger 25, be the pressurized air of supplying with from reciprocating air pump 61, this air pump 61 is to make piston 66 reciprocating reciprocating air pump on the direction parallel with cylinder axis C, this air pump 61 be arranged at cylinder cap 14 on the corresponding side of relief opening 24, be configured in the bottom of cylinder body 13.And on cylinder body 13, form operating chamber 62, this operating chamber 62 is configured in the below of cylinder barrel 16, with the plane of cylinder axis C square crossing in, slightly L word shape ground is communicated with above-mentioned the 2nd valve cage 49, above-mentioned air pump 61 is configured in being provided with in the portion continuously of the 2nd valve cage 49 and operating chamber 62 below comparing with the 2nd valve cage 49.

Comprehensively with reference to Figure 10, the pump case 63 of air pump 61 has the axis parallel with cylinder axis C, simultaneously integrally formed with cylinder body 13, being to what cylinder cap 14 sides were opened has the cylindric of the end, and the cover 64 of the above-mentioned cylinder cap 14 side opening portions of hermetic closed this pump case 63 is concluded in cylinder body 13.And, cover 64 with the same plane of the junction plane 87 of cylinder body 13 and cylinder cap 14 on, combine with pump case 63.

Piston 66 is embedded in pump case 63 slidably, between an end and cover 64 of piston 66, form pump chamber 65, this pump chamber 65 is disposed at cylinder cap 14 sides, produce with volume and shrink corresponding pressurized air, between the closed end of the other end of piston 66 and pump case 63, form air-pressure chamber 88, this air-pressure chamber 88 is configured in oil sump 12a side.

On the other hand, on operating chamber 62, dispose bearing part 69 cylindraceous, this bearing part 69 has the parallel axes with camshaft 41, and connect the axis of the axis of above-mentioned piston 66, this bearing part 69 is by bolt 71 ... conclude many that are arranged on the cylinder body 13 outstanding respectively, for example 4 conclude projection 70 ... on.And the cover 72 that forms the exterior lateral sides of operating chamber 62 is concluded in cylinder body 13, when cover 72 is open, can carries out fastening and unscrews above-mentioned bolt 71 ... operation.

Pump live axle 73 coaxial inserting are led in above-mentioned bearing part 69, and roller bearing 74 is situated between and is loaded between the end and pump live axle 73 of bearing part 69, and ball bearing 75 is situated between and is loaded between the other end and pump live axle 73 of bearing part 69.That is, pump live axle 73 by conclude bearing part 69 on cylinder body 13 can rotate freely ground supported.

In the part of giving prominence to from an end of above-mentioned bearing part 69, on pump live axle 73, between power transmitting deice 89, to transmit from the power of camshaft 41, this power transmitting deice 89 is by the 2nd driven sprocket 78 and the 2nd drive sprocket 79 that are fixed on the pump live axle 73, the 2nd drive sprocket 79 is one with the 1st driven sprocket 52 that is combined on the camshaft 41, and the chain 80 of the circulation shape of lash on the 2nd driven and drive sprocket 78,79 constitutes.

Pump live axle 73 is between scotch yoke formula bent axle 84, link with the piston 66 of air pump 61, scotch yoke formula bent axle 84 front ends with eccentric shaft 73a are linked to slidably with the chimeric slide 68 of piston 66 and constitute, and the front end of this eccentric shaft 73a is outstanding from the eccentric position of an end of pump live axle 73.So, rotate correspondingly by the power that comes from camshaft 41 transmission with pump live axle 73, eccentric shaft 73a is around the axis rotation of pump live axle 73, and in pump case 63, the piston of air pump 61 66 back and forth is driven the volume of increase and decrease pump chamber 65 at axle direction.

Sliding eye 67 is arranged on the piston 66, and this sliding eye 67 is along the one diameter line, simultaneously, disposes axis on the plane that intersects with the axis normal of above-mentioned camshaft 41, and above-mentioned slide 68 is chimeric with this sliding eye 67 slidably.In addition, eccentric shaft 73a one is outstanding is arranged on the end of pump live axle 73.

So, on pump case 63, be provided with the opening portion 76 of the end insertion that makes pump live axle 73, on piston 66, the rotation of respective pump live axle 73, allowable offset axle 73a moves at the axial direction along sliding eye 67, makes the patchhole 77 that inserts eccentric shaft 73a, and the length direction central part by sliding eye 67 is provided with.

Central part between ball bearing 75 and roller bearing 74, both sides at bearing part 69, open-work 81,82 is set respectively, in the position corresponding with a side open-work 81, on bearing part 69, be wholely set machine oil guider 83, the part that this machine oil guider 83 is used for falling the machine oil in the operating chamber 62 guides between bearing part 69 and the pump live axle 73.Promptly, be stranded in the part of the machine oil of the bottom in the 1st valve cage 48 for guiding, the path 134 that is arranged on the cylinder cap 14 is arranged on the cylinder cap 14, by this path 134, path 135 to operating chamber 62 openings is arranged on the cylinder body 13, machine oil guider 83 is wholely set on bearing part 69, will import open-work 81 from the machine oil that path 135 falls.In addition, be imported into the part of the machine oil between bearing part 69 and the pump live axle 73, be used for lubricated roller bearing 74 and ball bearing 75, remaining part falls into bottom in the operating chamber 62 from open-work 82, the machine oil that is stranded in the bottom of operating chamber 62 passes through the bottom of operating chamber 62, turns back to oil sump 12a side from the loop 136 that is arranged on the cylinder body 13.

About above-mentioned bearing part 69, in the opposition side of air pump 61, on cylinder body 13, installation has the water pump 90 with the coaxial spin axis of pump live axle 73, about comprising cylinder axis C and plane P L 73 square crossings of pump live axle, in position in the face of claiming, configuration air pump 61 and water pump 90.

The pump case 91 of water pump 90 is that the pump cover 93 by the open end of shell main body 92 and closed shell main body 92 constitutes, this shell main body 92 is that the dish shape 92b of portion one is connected with in the open end that the 92a of round-ended cylinder portion is arranged of canned pump live axle 73 sides and forms, pump cover 93 is concluded in cylinder body 13, the open end peripheral part of shell main body 92 is held on and cylinder body 13 between.

On the central part of closed end central part that the 92a of round-ended cylinder portion is arranged and pump cover 93, can be supported with rotating freely as with the two end part of the coaxial pump shaft 94 of pump live axle 73, for with the rotation of this pump shaft 94 one, fixing inner magnet 96 on the rotor 95 in being inserted with the 92a of round-ended cylinder portion.On the other hand, from the other end of the outstanding pump live axle 73 of the other end of bearing part 69, be fixed with rotary component 97, this rotary component 97 has the coaxial cylindrical part 97a that the 92a of round-ended cylinder portion is arranged around above-mentioned shell main body 92, at the inner face of above-mentioned cylindrical part 97a, fixedly outer magnet 98.In view of the above, corresponding rotation parts 97 together rotate with pump live axle 73, rotor 95 and pump shaft 94 also together rotation.

But, between shell main body 92 and pump cover 93, forming volute casing 99, the blade 100 that is accommodated in this volute casing 99 is arranged on the rotor 95.

On pump cover 93, the suction port 101 of a plurality of central part openings to volute casing 99 is set ..., from this suction port 101 ... the cooling water that is drawn into volute casing 99 is pressurized by the rotation of blade 100.So, the cooling water that spues from water pump 90 supplies to the cylinder body side water jacket 102 that is arranged on the cylinder body 13, and by this cylinder body side water jacket 102, be arranged on the cylinder cap side water jacket 103 on the cylinder cap 14, the cooling water of discharging from cylinder cap side water jacket 103 is to import to the state of no illustrated water tank etc. and circuitous water tank etc., return suction port 101 ... state, according to the temperature of cooling water, to change by thermostat 104, the thermostat shell 105 of this thermostat 104 is integrally formed with the pump cover 93 of above-mentioned water pump 90.

The upper portion side wall of the pump case 63 in air pump 61 is provided with machine oil introduction hole 85, and makes it pass through the 2nd valve cage 49, and the part of machine oil that this machine oil introduction hole 85 is used for circulating in the 2nd valve cage 49 imports in the pump case 63 as lubricant oil.But, because the rotation in the 2nd valve cage 49, the air inlet side cam 39 and the exhaust side cams 40 of camshaft 41, stirring circulates in the part of the machine oil in the 2nd valve cage 49, simultaneously, makes it separation by action of centrifugal force and disperses, in addition, the part of 37 machine oil of supplying with from the engine oil supplying road is dispersed by the action of centrifugal force separation,, set the relative position of camshaft 41 and machine oil introduction hole 85 for the machine oil spittle that makes separation imports machine oil introduction hole 85.

But, amplitude with valve gear 38 corresponding parts in the 2nd valve cage 49, formation is greater than the part beyond it, slightly semicircle shape surround with camshaft 41 in air inlet side cam 39 and the prominent wall 86 of exhaust side cams 40 corresponding parts, with machine oil circulating direction 137 subtends in the 2nd valve cage 49, one is outstanding to be arranged on the cylinder body 13, and the machine oil introduction hole 85 of above-mentioned air pump 61 is configured in the position, positive upper reaches of above-mentioned prominent wall 86 along machine oil circulating direction 137.That is, prominent wall 86 carries out and will circulate in the action of the machine oil importing machine oil introduction hole 85 in the 2nd valve cage 49.

And, machine oil introduction hole 85 is arranged on the pump case 63, compare with the piston ring 138 of interior all sliding contacts of the pump case 63 of the periphery that is installed in piston 66, in atmospheric air chamber 88 sides, interior all openings to pump case 63, have nothing to do a machine oil introduction hole 85 and an end normal open that is arranged on the sliding eye 67 on the piston 66 axial moving with piston 66.In addition, periphery at piston 66, a pair of groove 139 is set ... between the end of atmospheric air chamber 88 sides of these groove 139 binding pistons 66 and the two ends of sliding eye 67, a part that imports to the machine oil of pump case 63 from machine oil introduction hole 85 is used between lube pistons 66 and the pump case 63, and remaining part is through above-mentioned groove 139 ... flow into atmospheric air chamber 88 sides.And, above-mentioned groove 139 ... by the machine oil in the discharging sliding eye 67, can reach the effect of the pumping action of slide 68 generations that prevent in scotch yoke formula bent axle 84.

And, flow into the machine oil in the atmospheric air chamber 88, flow to operating chamber 62 sides from opening portion 76, and then 136 flow into oil sump 12a sides from the loop.

Pay special attention to Fig. 9, constituting of sparger 25, be burner oil, and be installed on the 1st injection valve 107 on the cylinder head cover 15, with for together to inject fuel directly into firing chamber 19 with pressurized air, and the 2nd injection valve 108 that is installed on cylinder cap 14 is coaxial continuing, and the 2nd injection valve 108 has the nozzle 108a that charges into firing chamber 19.

On cylinder cap 14, the chimeric airtightly embedding hole 109 that said nozzle 108a is arranged, with compare with this embedding hole 109, have the internal diameter in big footpath, with the embedding hole 109 coaxial insertion tubes 110 that link to each other, with the coaxial setting of cylinder axis C, 108 its nozzle 108a are chimeric with embedding hole 109 airtightly for the 2nd injection valve, simultaneously, are being formed at embedding hole 109 and inserting on the end difference 111 of the ring-type between the tube 110, insert tube 110 from cylinder head cover 15 sides, until contacting between locking compression spring 123.

Then, insert to insert tube 110 until with end difference 111 state of contact under, the front end of the 2nd injection valve 108, it is the cavity 143 that nozzle 108a charges into the piston 17 that is positioned at top dead center, when the front end of spark plug 26 is positioned at top dead center at piston 17, in cavity 143, be positioned at the below of said nozzle 108a.

The lead continual-connecting-part 108b that the 2nd injection valve 108 its rear portions have, be configured on the otch 110a that is arranged on the rear end of inserting tube 110, outside inserting tube 110, couple of conductor 112 from lead continual-connecting-part 108b derivation ... connect grommet 113, pulled into the outside, this grommet 113 is clipped between the involutory surface of cylinder cap 14 and cylinder head cover 15.

On the other hand, on cylinder head cover 15, chimeric maintenance the 1st injection valve 107, simultaneously, integrally formed sparger shell 114 cylindraceous, this sparger shell 114 also have with above-mentioned the 2nd injection valve 108 positioning clamping in and cylinder cap 14 between the function as the positioning part, to the cylinder cap 14 of cylinder head cover 15 in conjunction with the time, the back end in contact of the front end of sparger shell 114 and the 2nd injection valve 108.In addition, in the rear end of sparger shell 114, the rearward end of the 1st injection valve 107 is clipped in and sparger shell 114 between grip block 115 conclude.

The 1st injection valve 107 is equipped with the terminal 107a that distribution is used at its rear portion, the rearward end of the 1st injection valve 107 is by sparger shell 114 and grip block 115 clampings, when the 1st injection valve 107 was installed on the cylinder head cover 15, the foreign side of closing on cylinder head cover 15 disposed the terminal 107a that above-mentioned distribution is used.

But, between sparger shell 114 and the 1st injection valve 107, form the fuel chambers 116 by the ring-type in the 1st injection valve 107, being situated between from a pair of sealed member 117,118 of this fuel chambers 116 of sandwich is loaded between the 1st injection valve 107 and the sparger shell 114.

And, on cylinder head cover 15, directly be provided with fuel supply path 119 by above-mentioned fuel chambers 116, from not having flexible pipe 120 that illustrated fuel supply source imports fuel, be routed to fuel supply path 119 between joint 121.

In addition, between the rearward end of the front end of the 1st injection valve 107 and the 2nd injection valve 108, in sparger shell 114, form air chamber 122, supply to this air chamber 122 from the pressurized air of above-mentioned air pump 61 by the ring-type in the 2nd injection valve 108.

Note Fig. 2 and Figure 10, on the cover 64 in air pump 61, suction pipe 124 is set, this suction pipe 124 with do not continue from there being the flexible pipe that illustrated air-strainer imports air, this suction pipe 124 continues with pump chamber 65 between the leaf valve that is built in cover 64 (not having diagram).

In addition, on above-mentioned cover 64, the pressure that is built-in with according to pump chamber 65 increases the poppet valve 125 of driving valve, supplies with road 126 between above-mentioned poppet valve 125 and pressurized air, and the pressurized air that spues from air pump 61 supplies to air chamber 122.

Pressurized air is supplied with constituting of road 126, links to each other with above-mentioned poppet valve 125, and an end and cover 64 continue, simultaneously, and the pipe part 127 that the other end and cylinder cap 14 continue; Communicate with pipe part 127, be set directly at the path 128 on the cylinder cap 14; Be communicated with this path 128, simultaneously, be communicated with, be set directly at the path 129 on the cylinder head cover 15 with air chamber 122.

And, be set directly at the path 128 on the cylinder cap 14, in the opposition side of two driveshafts, 46,47 sides that are provided with valve gear 38, promptly be disposed at air inlet side in the 1st valve cage 48 and the other end side of exhaust side the 2nd

pitman arm shaft

58,59, be arranged on the cylinder cap 14.And, the part of this path 128 particularly near relief opening 24, is configured between relief opening 24 and the cylinder body 13 with respect to cylinder cap side water jacket 103 by near the relief opening 24, set above-mentioned path 128 for for relief opening 24, be communicated with the opposition side of above-mentioned cylinder cap side water jacket 103.

In addition, stride across the two end part of locating stud cylindraceous 130 of the involutory surface of cylinder cap 14 and cylinder head cover 15, insert cylinder cap 14 and cylinder head cover 15, constitute the part of pressurized air path 126, the path 128,129 that directly is arranged on cylinder cap 14 and the cylinder head cover 15 is communicated with between above-mentioned locating stud 130.And the O shape ring 133 that centers on locating stud 130 is clipped between the involutory surface of cylinder cap 14 and cylinder head cover 15.

In addition, in locating stud 130, form hole 131, the relief valve 132 that is connected in the above-mentioned path 128 of the upstream side of comparing with this hole 131 is installed on the cylinder cap 14.

Then, if describe with regard to this embodiment's effect, the 1st and the

2nd intake valve

27,28 then, exhaust valve 29 is at these

valves

27,28; 29 action axis is on the projection drawing of the imaginary plane that comprises cylinder axis C, be the configuration of V word shape, be provided on the cylinder cap 14 with can carrying out on-off action, because have the 2nd injection valve 108 of the axis parallel with cylinder axis C, between

intake valve

27,28 and exhaust valve 29, be installed on the cylinder cap 14, inject fuel directly into firing chamber 19, so the fuel that ejects from the 2nd injection valve 108 can accumulate near the center of firing chamber 19, make lean combustion become possibility, can reduce fuel consumption.And, because the 2nd injection valve 108 is that fuel is directly injected to firing chamber 19 with pressurized air,, pursues and further reduce fuel consumption so, can improve flammability by making fuel be ejected into the firing chamber after the pelletizing more.

In addition, as a whole, 3 intake valves 27 as odd number, 28 and exhaust valve 29 be provided on the cylinder cap 14, because spark plug 26 is installed on the cylinder cap 14, with arranged side by side as the exhaust valve 29 of the few valve of number, so by effectively utilizing the idle space that is produced around the exhaust valve 29, configuration spark plug 26, can increase the degrees of freedom of spark plug 26 in configuration, and, because spark plug 26 can be more near the 2nd injection valve 108, thus with combine near atomized fuel from the 2nd injection valve 108 can accumulate in the center of firing chamber 19, can further seek to reduce fuel consumption based on the stratiform rarefaction.

And, spark plug 26 is with corresponding as distolateral the 1st suction port 20 in the 1st and the 2nd suction port 20,21 of side by side configuration and column direction, simultaneously, position in 19 off-centring from the firing chamber, be installed on the cylinder cap 14, around the opening end of the firing chamber 19 of the 1st suction port 20, on the roof 19a of firing chamber 19, the guide wall 142 that setting is led circulates the circuitous spark plug 26 of air inlet that flow into firing chamber 19 from the 1st suction port 20.

Therefore, flow into the air inlet of firing chamber 19 from the 1st suction port 20, by guide wall 142 guiding by the roof 19a of firing chamber 19, circuitous spark plug 26, circulation in firing chamber 19, air inlet can not conflict with spark plug 26, and in firing chamber 19, disperse, because the mixed gas in the firing chamber 19 can not be stirred,, can further reduce fuel consumption so lean combustion becomes possibility.

In addition, the central part at the face that faces firing chamber 19 of piston 17 is provided with cavity 143, because inject fuel directly into the 2nd injection valve 108 of firing chamber 19; A pair of suction port 20,21; The relief opening 22 corresponding with the 2nd suction port 21; And spark plug 26 is provided on the cylinder cap 14, by two suction ports 20,21, relief opening 22 and spark plug 26 are around the 2nd injection valve 108, so by 19 central part in the firing chamber, dispose the 2nd injection valve 108 and spark plug 26, make cavity 143 compactnesss of piston 17, the laminarization by seeking mixed gas and the raising of compression ratio, can improve combustion efficiency, further reduce fuel consumption.

Further, the sparger 25 that comprises the 2nd injection valve 108 is configured on the cylinder axis C, to with the projection drawing on the plane of cylinder axis C square crossing on, because both sides at sparger 25, dispose the 1st suction port 20 and relief opening 22, simultaneously, omiting on another straight line L2 of square crossing with the straight line L1 that links the 2nd suction port 21 and relief opening 22, side at sparger 25, dispose the 1st suction port 20, so sparger 25 is configured in the central part of firing chamber 19, and in addition, the flame travel in firing chamber 19 can not produce deviation, can improve combustion efficiency, by having the 1st and the 2nd suction port 20,21, can seek to improve fills with air efficient and reduce the suction loss, and, can dispose spark plug 26, make it to avoid easily and 2 intake valves 27, the contact of 28 and 1 exhaust valves 29 makes spark plug 26 become possibility near being configured in sparger 25, can improve combustion efficiency.

In addition, because the front end of the nozzle 108a that the 2nd injection valve 108 is had, the cavity 143 of the piston 17 that is positioned at top dead center of advancing by leaps and bounds is so be sprayed in the cavity 143 by the mixed gas that will comprise the fuel after the miniaturization, can further improve combustion efficiency, further reduce fuel consumption.

Further, protrude in teat 144 outstanding being arranged on the roof 19a of firing chamber 19 of piston 17 sides, because spark plug 26 is installed on the cylinder cap 14, from teat 144 to the outstanding front end in firing chamber 19, front end with the 2nd injection valve 108, the front end that is nozzle 108a is compared, be configured in the below, so in cavity 143, the front end of spark plug 26 is the structures that are configured in the below of the 2nd injection valve 108, simultaneously, the influence of the eddy current in the firing chamber 19 is controlled to very little, prevent the stirring that the skew owing to mixed gas produces, can be in the bottom in the cavity 143, form the dense laminarization state of proportions of ingredients, can seek to improve ignition performance, by lean combustion reduction fuel consumption further.And, because cavity 143 increases deeply gradually along with near spark plug 26 sides,, can further improve ignition performance so have denseer mixed gas in spark plug 26 sides.

And, because at

intake valve

27,28 and exhaust valve 29 on, one end links synchronously, be configured in

intake valve

27,28 and exhaust valve 29 between air inlet side and exhaust side the

2nd Rocker arm

44,45, by being fixed on air inlet side and exhaust side the 2nd pitman arm shaft 58 on the

cylinder cap

14,59 respectively joltily pivot prop up, be configured in and two pitman arm shafts 58, a pair of air inlet side and exhaust side driveshaft 46 on 59 the end corresponding position, 47, be linked to air inlet side and exhaust side the 2nd Rocker arm 44 respectively synchronously, the other end of 45, so only will drive

intake valve

27,28 and the valve gear 38 of exhaust valve 29 in air inlet side and exhaust side the

2nd Rocker arm

44,45 with air inlet side and exhaust side the 2nd

pitman arm shaft

58,59 are provided on the cylinder cap 14, just can make cylinder cap 14 miniaturizations.

In addition, above-mentioned air inlet side and

exhaust side driveshaft

46,47, be driven at above-mentioned air inlet side and exhaust side the 2nd pitman arm shaft 58, axial side's side of 59, be disposed at the rotation of the camshaft 41 of cylinder body 13, move at axle direction, because be configured to reduce the space of cylinder cap 14 sides, simultaneously, at air inlet side and exhaust side the 2nd pitman arm shaft 58, between 59, with air inlet side and exhaust side the 2nd Rocker arm 44, the other end of 45 links synchronously, so can be with air inlet side and exhaust side the 2nd

pitman arm shaft

58,59 interval is set forr a short time, seeks cylinder cap 14 and links air inlet side and exhaust side the 2nd pitman arm shaft 58 on the edge, the miniaturization of the rectilinear direction of 59 axis.

Above-mentioned spark plug 26 is for the sparger 25 that comprises above-mentioned the 2nd injection valve 108, at air inlet side and

exhaust side driveshaft

46,47 opposition side, be installed on the cylinder cap 14, configuration according to such spark plug 26, by configuration air inlet side and exhaust side the

2nd Rocker arm

44,45, with air inlet side and

exhaust side driveshaft

46,47 synchronous linking department, avoid the few part of idle space and dispose spark plug 26, can increase the degrees of freedom of spark plug 26 in configuration, and, because can make spark plug 26 more near the 2nd injection valve 108, so with combine near atomized fuel from the 2nd injection valve 108 can accumulate in the center of firing chamber 19, can further seek owing to the stratiform rarefaction reduces fuel consumption.

Between the cylinder cap 14 and cylinder head cover 15 of a part that constitutes engine body 11, the 1st valve cage 48 of the part of configuration valve gear 38 is taken in formation, crankcase 12 in engine main body 11, on cylinder body 13 and the cylinder cap 14, machine oil with the part in lubricated the 1st valve cage 48 that is accommodated in the valve gear 38, turn back to the 2nd valve cage 49 of the oil sump 12a of the bottom that is formed at crankcase 12,, extend in parallel and form with cylinder axis C in the side of cylinder barrel 16.And, compare with the 2nd valve cage 49, below on the pump case 63 of air pump 61 of configuration, machine oil introduction hole 85 is set, by the 2nd valve cage 49, the part that this machine oil introduction hole 85 is used for circulating in the machine oil of the 2nd valve cage 49 imports in the pump case as lubricant oil.

Therefore, after the part of lubricated valve gear 38, turn back to the part of the machine oil of oil sump 12a, be imported into the machine oil introduction hole 85 of air pump 61 really,, can reach the effect of lubricated air pump 61 positively by simple structure.

In addition, because compare with cylinder cap 14 or crankcase 12, on the little cylinder body 13 of profile, integrally formed pump case 63, so can continue to reduce number of spare parts on one side, seek all miniaturizations of motor on one side, the 2nd valve cage 49 is easy with being communicated with of machine oil introduction hole 85, can make the structure simplicity of air supply pump 61 machine oil.

In addition, in the 2nd valve cage 49, take in be useful on from the transmission of power of bent axle 10 to the camshaft 41 of valve gear 38 the 1st by movable sprocket 52, the 1st drive sprocket 60 and cam chain 53, used as the machine oil loop by the 2nd valve cage 49 of movable sprocket the 52, the 1st drive sprocket 60 and cam chain 53 by taking in the 1st, can seek the simplicity of the structure of the miniaturization of motor and air supply pump 61 machine oil.

Camshaft 41 is contained and is configured in the 2nd valve cage 49, because be that relative position with camshaft 41 and machine oil introduction hole 85 is set at the rotation of following this camshaft 41, can import machine oil introduction hole 85 sides by the machine oil spittle that centrifugal action separates, so by circulating in the machine oil in the 2nd valve cage 49, camshaft lubrication 41 well, simultaneously, to import to air pump 61 effectively owing to the machine oil spittle that the rotation of camshaft 41 is dispersed, can carry out lubricated well air pump 61.

Between the pump live axle 73 and camshaft 41 that link to each other with air pump 61, be provided with the transmission of power of camshaft 41 power transmitting deice 89 to the pump live axle 73, the camshaft 41 that drives air pump 61 is near being configured on the air pump 61, can make the structure simplicity of power transmitting deice 89, seek the miniaturization of motor.

And, because camshaft 41 also is to be configured on the less cylinder body of profile 13, so can further expect the miniaturization of motor, in addition, can constitute compactly and will arrive the power transmitting deice 89 of air pump 61 from the transmission of power of camshaft 41, simultaneously, also improved the degrees of freedom that the gear ratio of air pump 61 is set.Add, because power transmitting deice 89 is the formation by chain 80 transferring power of circulation shape, so no matter the distance between camshaft 41 and the pump live axle 73 can prevent the maximization of cylinder body 13, the control number of spare parts is a small amount of.

In addition, on cylinder body 13, the prominent wall 86 of machine oil circulating direction 137 subtends in outstanding setting and the 2nd valve cage 49, make the machine oil of the bottom in the 2nd valve cage 49 be directed to machine oil introduction hole 85, by prominent wall 86, effectively machine oil is directed to machine oil introduction hole 85, can lubricates air pump 61 better.

But air pump 61 is shuttle formations, can obtain than higher air pressure.And, because pump live axle 73 is between scotch yoke formula bent axle 84, link with piston 66, this pump live axle 73 transmits from the power that makes piston 66 at the direction reciprocating camshaft 41 parallel with cylinder axis C, so the action axis of air pump 61 is parallel with cylinder axis C, simultaneously, adopted scotch yoke formula bent axle 84, do not need connecting rod, make the miniaturization of motor become possibility.

In addition, constituting of air pump 61, compressing generation pressurized air according to volume, be configured in the pump chamber 65 of above-mentioned cylinder cap 14 sides, with by oil sump 12a, be configured on the atmospheric air chamber 88 of this oil sump 12a side, the piston 66 that two ends are faced mutually can be embedded on the pump case 63 with being free to slide, be installed in the periphery of piston 66, in atmospheric air chamber 88 sides of comparing with the piston ring 138 of interior all sliding contacts of pump case 63, because machine oil introduction hole 85 is to interior all openings of pump case 63, so lubricated the machine oil in the air pump 61, by the suction and pumping effect of piston 66, be discharged to oil sump 12a side from atmospheric air chamber 88 smooth-goingly, can make the efficiency of movement of air pump 61 and lubricate good.

But, the pump case 63 of air pump 61 for cylinder cap 14 sides open the round-ended cylinder shape arranged, be integrally formed at cylinder body 13, because the cover 64 of the cylinder cap 14 side opening portions of hermetic closed pump case 63, with the same plane of the junction plane 87 of cylinder body 13 and cylinder cap 14 on, combine with pump case 63, so can reduce the machining period of cylinder body 13.

Further, about comprising cylinder axis C and plane P L 73 square crossings of pump live axle, because in the face of the title position, configuration is linked to the air pump 61 and the water pump 90 at the two end part of pump live axle 73, so drive water pump 90 by the pump live axle 73 that links to each other with air pump 61, make reduction number of spare parts and lightweight become possibility, can reduce cost because of the simplicity of processing and assembling.In addition, it is outstanding from cylinder body to suppress water pump 90, can avoid all maximizations of cylinder body 13.

And, can be near cylinder body 13 of answering water-cooled and cylinder cap 14, configuration water pump 90, the pipe arrangement of shortening water can be avoided the complicated of pipe arrangement, and the pressure loss that can suppress simultaneously in the pipe arrangement is minimum.

Further, because fuel is configured on the cylinder cap 14 with the sparger 25 that is directly injected to firing chamber 19 by air pump 61 resulting pressurized air, so air pump 61 is not provided on the cylinder cap 14, can seek the increase of design freedom and the miniaturization of motor on one side, Yi Bian sparger 25 or its pipe arrangement are configured on the cylinder cap 14.Particularly, because the pump chamber 65 of air pump 61 is configured in cylinder cap 14 sides, so it is shorter between pump chamber 65 and the sparger 25, can avoid the complicated of pipeline structure, this pipeline structure comprises supplies with road 126 with pressurized air from the pressurized air that air pump 61 imports sparger 25, also can be suppressed to the pressure loss in the above-mentioned pipeline structure very little.

Above-mentioned pressurized air is supplied with the part on road 126 by near the relief opening 24, in view of the above, the exhaust heat of the exhaust by circulating in relief opening 24 can warmly circulate in the pressurized air that pressurized air is supplied with road 126, by increasing compressed-air actuated volume, can improve the efficient of pump.

And, near relief opening 24, part with respect to cylinder cap side water jacket 103 is configured between relief opening 24 and the cylinder body 13, constitute above-mentioned pressurized air and supply with the path 128 of a part on road 126 for relief opening 24, because be configured in the opposition side of cylinder cap side water jacket 103, water-cooled engine circulates in the pressurized air that pressurized air is supplied with road 126 so can avoid influence based on the cooling of cylinder cap side water jacket 103 to feed through to as far as possible, even also can keep very high pump efficiency.

In addition, air pump 61 with the respective side of relief opening 24, be provided in the bottom of cylinder body 13, air pump 61 can be configured in the configuration space of the motor that includes the outlet pipe that continues with relief opening 24.

But, constituting of sparger 25, for burner oil is installed in the 1st injection valve 107 on the cylinder head cover 15, with for fuel and pressurized air are directly injected to firing chamber 19 together, and be installed in the 2nd injection valve 108 coaxial continuing on the cylinder cap 14, when carrying out spraying, because as long as successively the 1st and the 2nd injection valve 107,108 is installed on cylinder head cover 15 and the cylinder cap 14 based on the auxiliary fuel of air, so assembling operation is not miscellaneous, can reduce number of spare parts in addition.And, because on cylinder cap 14,, compare so be installed on the cylinder cap with the valve body that 2 injection valves will be installed as long as guarantee to install the space of the 2nd injection valve 108, can reduce by cylinder cap 14 the installing space that should guarantee, can expect the miniaturization of cylinder cap 14.

In addition, the 1st injection valve 107 chimeric remaining on the sparger shell 114 in the sparger 25, because this sparger shell 114 is integrally formed with cylinder head cover 15, so there is no need to constitute the part of sparger shell 114 in the circumferential arrangement of cylinder cap 14, can reduce the quantity of part, simultaneously, can avoid miscellaneousization of the structure of the maximization of motor and motor periphery.

And, because the 2nd injection valve 108 is inserted into cylinder cap 14, be clamped in simultaneously between the front end and cylinder cap 14 of sparger shell 114, so only by the 2nd injection valve 108 being inserted cylinder cap 14 from cylinder head cover 15 sides, cylinder head cover 15 is combined with cylinder cap 14, just can the 2nd injection valve 108 be positioned with respect to cylinder cap 14, the operation that the 2nd injection valve 108 is assembled on the cylinder cap 14 is become easily, can improve assembling operation.

But, the 1st injection valve 107 is installed on the cylinder head cover 15, its distribution is closed on outside the cylinder head cover 15 with joint 107a, because the lead 112 that links to each other with the 2nd injection valve 108 ... perforation is clipped in the grommet 113 between cylinder cap 14 and the cylinder head cover 15, pulled into the outside, so the 2nd injection valve 108 is being installed on the cylinder cap 14, simultaneously, the lead 112 that extends since the 2nd injection valve 108 ... under the state of inserting logical grommet 113, cylinder head cover 15 is combined with cylinder cap 14, further, the 1st injection valve 107 is installed on the cylinder head cover 15, just can finish and comprise two injection valves 107,108 carry out the assembling of distribution, can further improve assembling performance.

Further, between the 1st and the 2nd injection valve 107,108 in sparger shell 114, form air chamber 122, this air chamber 122 retains the pressurized air that imports in the 2nd injection valve 108, by sparger shell 114, can be used for a part of supplying with structure for the pressurized air that pressurized air is imported to the 2nd injection valve 108.

In addition, because on cylinder head cover 15, fuel supply path 119 directly is set and supplies with the path 129 of the part on road 126 as pressurized air, this fuel supply path 119 is used for fuel and pressurized air are supplied to sparger shell 114 respectively, so needn't be around sparger shell 114, configuration is used for fuel and pressurized air are supplied to respectively the pipeline etc. of sparger shell 114, in view of the above, also number of spare parts can be reduced, miscellaneousization of the structure of the maximization of motor and motor circumferential component can be avoided simultaneously.

And, supply with the path 128 of the part on road 126 as pressurized air, distolateral at another of air inlet side and exhaust side the 2nd

pitman arm shaft

58,59, be arranged on the cylinder cap 14, by avoiding valve gear 38, a part of pressurized air being supplied with road 126 is arranged on the cylinder cap 14, just can avoid the maximization of cylinder cap 14.

But, constitute to drive the camshaft 41 of a part of the valve gear 38 of the 1st intake valve 27, the 2 intake valves 28 that are provided on the cylinder cap 14 and exhaust valve 29, avoid being configured on the cylinder body 13 between cylinder cap 14 and the cylinder head cover 15.Therefore, camshaft 41 is not configured between cylinder cap 14 and the cylinder head cover 15, can increase the degrees of freedom of the design of sparger shell 114, can increase the fuel supply path 119 that is set directly on the cylinder head cover 15 and the design freedom of path 129.

In addition, the 2nd injection valve 108 in the sparger 25 is supported on the cylinder head cover 15, be set directly on the cylinder head cover 15 as path 129 from the part on compressed-air actuated pressurized air supply road 126 to the 2nd injection valve 108 that supply with, periphery at cylinder head cover 15, needn't dispose the part that is used for pressurized air is imported to sparger 25, just can avoid miscellaneousization of the structure of the maximization of motor and motor periphery.

In addition, the two end part of locating stud cylindraceous 130 that stride across the involutory surface of cylinder cap 14 and cylinder head cover 15 are inserted on cylinder cap 14 and the cylinder head cover 15, constitute the part of pressurized air path 126, be set directly at path 128,129 on cylinder cap 14 and the cylinder head cover 15 respectively by being communicated with between above-mentioned locating stud 130, determine the relative position of cylinder cap 14 and cylinder head cover 15 with locating stud 130, even by cylinder head cover 15 and cylinder cap 14, sparger 25 is supported in cooperation, also can not apply excessive stress to sparger 25.Further, locating stud 130 is used as the path 128 of cylinder cap 14 succeeding component with the path 129 of cylinder head cover 15, the parts peculiar of the path that do not need to be used to continue just can expect to reduce number of spare parts.

Further, because in locating stud 130, form hole 131, thus can adjust the compressed-air actuated pressure that supplies to sparger 25, and, do not need parts peculiar to the adjustment of this pressure, just can expect to reduce number of spare parts.

More than, embodiments of the invention have been described, the present invention is not limited to the foregoing description, only otherwise break away from described the present invention in the patent claimed range, just can carry out all design alterations.

According to the described invention of above such claim 1, the injection valve that injects fuel directly into the firing chamber, insert cylinder cap from the cylinder head cover side, only by cylinder head cover is attached on the cylinder cap, just can be with respect to cylinder cap, injection valve is positioned, and the operation that injection valve is installed on the cylinder cap becomes easily, can improve installation exercise.

In addition, invention according to claim 2 is when the fuel that carries out assisting based on air sprays, because as long as successively the 1st and the 2nd injection valve is installed on cylinder head cover and the cylinder cap, so it is miscellaneous that installation exercise can not become, also can reduce the quantity of parts in addition.And, can dwindle the installing space that should guarantee by cylinder cap, can expect the miniaturization of cylinder cap.

Invention according to claim 3 is installed to the 2nd injection valve and becomes on the cylinder cap easily, can further improve installation.

Invention according to claim 4, the 2nd injection valve is installed on the cylinder cap, inserting from the extended lead of the 2nd injection valve under the state of logical liner simultaneously, cylinder head cover is attached on the cylinder cap, and then by the 1st injection valve is installed on the cylinder head cover, just the installation that comprises to the distribution of two injection valves can be finished, installation can be further improved.

Further, invention according to claim 5 can be used in a part that pressurized air is imported to the pressurized air supply structure of the 2nd injection valve, by sparger shell dual-purpose.

Claims

1. four-stroke direct fuel-injection engine, inject fuel directly in the firing chamber (19), it is characterized in that, the 2nd injection valve (108) that injects fuel directly into firing chamber (19) inserts the cylinder cap (14) from cylinder head cover (15) side, with respect to above-mentioned cylinder cap (14), the sparger shell (114) that the 2nd injection valve (108) is positioned is arranged on the above-mentioned cylinder head cover (15)

The 1st injection valve (107) of burner oil is installed on the cylinder head cover (15), the 2nd injection valve (108) is installed on the above-mentioned cylinder cap (14), the 2nd injection valve (108) links to each other and fuel and pressurized air is directly injected in the above-mentioned firing chamber (19) with the 1st injection valve (107) is coaxial

Above-mentioned the 1st injection valve (107) is chimeric and maintenance with the sparger shell (114) that is arranged on the tubular on the cylinder head cover (15), above-mentioned the 2nd injection valve (108) is inserted in the above-mentioned cylinder cap (14), be clamped in simultaneously between the front end and cylinder cap (14) of above-mentioned sparger shell (114)

Cylinder head cover (15) is formed with fuel supply path (119) and pressurized air path (129) in sparger shell (114), and the 1st injection valve (107) of burner oil is positioned in the cylinder head cover (15) by grip block (115) clamping.

2. four-stroke direct fuel-injection engine as claimed in claim 1, it is characterized in that, the distribution that above-mentioned the 1st injection valve (107) is had is positioned at the outside of cylinder head cover (15) with joint (107a), the 1st injection valve (107) is installed on the cylinder head cover (15), the lead (112) that links to each other with above-mentioned the 2nd injection valve (108) connects the grommet (113) that is clipped between cylinder cap (14) and the cylinder head cover (15), pulled into the outside.

3. four-stroke direct fuel-injection engine as claimed in claim 1, it is characterized in that, between the above-mentioned the 1st and the 2nd injection valve (107,108) in above-mentioned sparger shell (114), form air chamber (122), this air chamber (122) stores the pressurized air that imports to the 2nd injection valve (108).