CN1329643C

CN1329643C - Four-stroke engine

Info

Publication number: CN1329643C
Application number: CNB031594522A
Authority: CN
Inventors: 塙薰; 上田浩矢; 栗原博
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2002-09-27
Filing date: 2003-09-25
Publication date: 2007-08-01
Anticipated expiration: 2023-09-25
Also published as: FR2845124B1; ITTO20030742A1; JP3966798B2; CN1493775A; JP2004116444A; FR2845124A1

Abstract

An ignition plug 26 is attached on a cylinder head 14 at a position shifted from a center of the combustion chamber 19 and corresponding to an air inlet port 20 of a parallel direction one end side of a plurality of the air inlet ports 20, 21 arranged in parallel, and a guide wall 142 guiding intake air flowing in the combustion chamber 19 from the inlet air port 20 on the one end side to bypass the ignition plug 26 is provided on a ceiling wall 19a of the combustion chamber 19 around an opening end of the inlet air port 20 of the one end side to the combustion chamber 19.

Description

Four stroke engine

Technical field

The present invention relates on the cylinder cap that is provided with a plurality of suction ports that are opened on the firing chamber, attachment face is to the four stroke engine of the spark plug of previous combustion chamber.

Background technique

In the past, such four stroke engine, for example having known has patent documentation 1 etc.

(patent documentation 1)

The special fair 5-71767 patent gazette of Japan.

The four stroke engine of above-mentioned prior art, because air inlet and spark plug collision that at least one from a plurality of suction ports flows in the firing chamber disperse in the firing chamber, so the mixed gas in the firing chamber is stirred, be difficult to realize lean combustion that the possibility that increases fuel cost is arranged.

Summary of the invention

The present invention is situation and proposing Given this, and purpose provides can carry out the four stroke engine that lean combustion reduces fuel cost.

To achieve these goals, four stroke engine of the present invention, on the cylinder cap that is provided with a pair of suction port that is opened on the firing chamber, attachment face is to the spark plug of previous combustion chamber, it is characterized in that, in correspondence side by side in a pair of suction port of configuration and a distolateral suction port of column direction and on the misalignment of firing chamber and position near the center of firing chamber, spark plug is installed in cylinder cap, forms independent relief opening in position near the suction port that is different from described one distolateral suction port in a pair of suction port; Around the opening end of firing chamber, guide wall is arranged on the roof of firing chamber at described one distolateral suction port, described guide wall makes that the air inlet that flows into to the firing chamber from described one distolateral suction port is circuitous to be flow through described spark plug ground and lead.At piston area the central part of the face of firing chamber is provided with cavity, will be to the injection valve of aforementioned firing chamber direct fuel injection, a pair of suction port, relief opening and the aforementioned spark plug corresponding with the suction port that is different from aforementioned one distolateral suction port in two suction ports are configured on the cylinder cap, make two suction ports, relief opening and spark plug surround aforementioned injection valve, the aforementioned injection valve that will spray by the fuel that pressurized air is atomized is so that the mode of the cavity of the piston that is positioned at top dead center is charged on the top is provided on the cylinder cap, the jut that is projected into piston side is arranged on highlightedly the roof of firing chamber, aforementioned spark plug is installed on the cylinder cap, makes its top be disposed at the below on the top of described injection valve.

According to structure of the present invention, an air inlet that promptly flows into the firing chamber from a plurality of suction ports from a distolateral suction port, the guide wall of the roof by the firing chamber is directed to walks around spark plug, flow through in the firing chamber, therefore can in the firing chamber, air inlet not disperseed with spark plug collision ground, also the mixed gas in the firing chamber can not stirred, thereby can realize lean combustion, reduction fuel cost.

By such structure, injection valve and spark plug are configured in the firing chamber central part, realize the compactness of cavity, improve the laminarization and the compression ratio of mixed gas, thereby improved combustion efficiency, can further reduce fuel cost.

And, the fuel miniaturization can be supplied to the firing chamber according to such structure, and the mixed gas by will comprising miniaturization fuel can further improve combustion efficiency to the cavity internal spraying of piston, reduce fuel cost.

And, according to such structure can suppress eddy current in the firing chamber influence, prevent mixed gas because imbalance causes stirring, the laminarization state of denseer proportions of ingredients is formed on the bottom in aforementioned cavity, improves ignition performance, thereby, reduce fuel cost by bigger lean combustionization.

Description of drawings

Fig. 1 is the local vertical profile side view of motor.

Fig. 2 be with cylinder cap take off 2-2 line among Fig. 1 under the state to view.

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

Fig. 4 is a 4-4 line sectional view among Fig. 3.

Fig. 5 is a 5-5 line sectional view among Fig. 4.

Fig. 6 is the amplification sectional view of the cylinder cap of 6-6 line in Fig. 2.

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

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

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

Figure 10 is the vertical profile side view of the motor of 10-10 line in Fig. 2.

Embodiment

One embodiment of the present of invention shown in reference to the accompanying drawings illustrate embodiments of the present invention below.

Fig. 1～Figure 10 is expression one embodiment of the present of invention, Fig. 1 is the local vertical profile side view of motor, Fig. 2 be among the Fig. 1 that takes off under the state of cylinder cap the 2-2 line to view, Fig. 3 is a 3-3 line sectional view among Fig. 2, Fig. 4 is a 4-4 line sectional view among Fig. 3, Fig. 5 is a 5-5 line sectional view among Fig. 4, Fig. 6 is the amplification sectional view of the cylinder cap of 6-6 line in Fig. 2, Fig. 7 is a 7-7 line sectional view among Fig. 2, Fig. 8 is a 8-8 line sectional view among Fig. 7, Fig. 9 is a 9-9 line sectional view among Fig. 7, and Figure 10 is the vertical profile side view of the motor of 10-10 line in Fig. 2.

At first, in Fig. 1, the engine main body 11 of the water-cooled single cylinder direct fuel-injection engine of Overhead valve formula four-stroke possesses: crankcase 12, be attached to the cylinder body 13 of this crankcase 12, be attached to the cylinder cap 14 of cylinder body 13 at the opposition side of aforementioned crankcase 12, and be attached to the cylinder head cover 15 of cylinder cap 14 at the opposition side of cylinder body 13, cylinder cap 14 sides are loaded into the low attitude in high back before slightly on the vehicle such as automotive bicycle.

Simultaneously with reference to Fig. 2～Fig. 4, can embed the piston 17 that combines with the hollow nest 16 of the cylinder that is arranged on cylinder body 13 slidably and be connected to the bent axle 10 (with reference to Fig. 1) that is freely supported in crankcase 12 rotations, between cylinder body 13 and cylinder cap 14, form firing chamber 19 in the face of the top of this piston 17 by connecting rod 18 and crankpin (not shown).

On cylinder cap 14, be set up in parallel an end be opened on the roof 19a of firing chamber 19 separately and make the other end together open communication in first and second suction ports 20,21 of the upper side of cylinder cap 14, be provided with simultaneously an end opening in the firing chamber 19 roof 19a simultaneously the other end be opened on the relief opening 22 of the lower side of cylinder cap 14.

First and second suction ports 20,21 are cut off connection by first and

second suction valves

27,28 respectively to the opening end of firing chamber 19, and relief opening 22 is deflated valve 29 cut-out connections to the opening end of firing chamber 19.Just, on cylinder cap 14, as a whole, can cut off the

suction valve

27,28 and the outlet valve 29 that are communicated with action ground configuration odd number, first and

second suction valve

27,28 can be embedded respectively slidably be attached to the guide cylinder 30... that is fixed on cylinder cap 14, between the guard ring 31... of the upper end portion that is separately fixed at two

suction valves

27,28 outstanding from guide cylinder 30... and cylinder cap 14 valve spring 32... is set respectively, the elastic force that these valve springs 32... produces is given tight power to two

suction valves

27,28 to the direction of connecting valve.Outlet valve 29 can embed slidably and be attached to the guide cylinder 33 that is fixed on the cylinder cap 14, valve spring 35 is set being fixed between the guard ring 34 of the upper end portion of the outstanding outlet valve 29 of guide cylinder 33 and cylinder cap 14, the elastic force that this valve spring 35 produces is given tight power to outlet valve 29 to the direction of connecting valve.

And, with the action axis of two

suction valves

27,28 is the axis of two guide cylinder 30..., on the projection drawing of the imaginary plane that comprises aforementioned cylinder-bore axis C, overlapping the to each other configuration arranged side by side with the axis normal ground of bent axle 10, the action axis of two

suction valves

27,28 and the action axis of outlet valve 29 are that the axis of guide cylinder 33 becomes V word shape on the projection drawing of aforementioned imaginary plane, two

suction valves

27,28 and outlet valve 29 can be cut off with being communicated with action being configured on the cylinder cap 14.

Yet, on the projection drawing on the plane vertical with cylinder-bore axis C, first suction port 20 and relief opening 22 are configured in the both sides of aforementioned cylinder-bore axis C, with another straight line L2 of the straight line L1 approximate vertical that is connected second suction port 21 and relief opening 22 on, the side of cylinder-bore axis C, dispose first suction port 20 abreast with second suction port 21.With corresponding along distolateral first suction port 20 two suction ports 20,21 and column direction and from the firing chamber 19 misalignment and also with the outlet valve 29 of comparing the less side of number with

suction valve

27,28 side by side position mutually, will be installed on the cylinder cap 14 in the face of the spark plug 26 of firing chamber 19.

On firing chamber 19, be provided with the promptly parallel axis of axis with cylinder-bore axis C with the hollow nest 16 of cylinder, between aforementioned two

outlet valves

27,28 and outlet valve 29, by the sparger 25 that is disposed on the cylinder cap 14 fuel is directly sprayed, in the present embodiment, sparger 25 is disposed on the cylinder cap 14 coaxially with cylinder-bore axis C.

Just, with sparger 25, a pair of suction port 20,21, relief opening 22 and spark plug 26 that second suction port 21 is corresponding, sparger 25 is configured on the cylinder cap 14 with surrounding by two suction ports 20,21, relief opening 22 and spark plug 26.

Among Fig. 5, in first and second suction port 20,21 that is disposed at mutually side by side and distolateral second suction port 21 of column direction one around the opening end of firing chamber 19, guide wall 142 is arranged on the roof 19a of firing chamber 19, described guide wall 142 makes that the air inlet that flows into to firing chamber 19 from second suction port 21 is circuitous to be flow through spark plug 26 ground that are positioned at first suction port, 20 corresponding positions and lead.

With reference to Fig. 6, cavity 143 is arranged on the central part of the face of facing firing chamber 19 of piston 17 simultaneously.Be formed on the roof 19a of firing chamber 19 at piston 17 side-prominent juts 144, spark plug 26 is installed on the cylinder cap 14, will be configured in the below, top of sparger 25 from jut 144 to 19 outstanding tops, firing chamber.And aforementioned cavity 143 forms more deeply facing to aforementioned spark plug 26 sides.

With further reference to Fig. 7～Fig. 9, first and

second suction valve

27,28 and the outlet valves 29 cut off connection by valve gear 38 and drive, and this valve gear 38 possesses: be provided with the cam week 41 that air inlet side and exhaust side cams 39,40 are rotated; Be driven in air inlet side first Rocker arm 42 that aforementioned air inlet side cam 39 shakes; Be driven in exhaust side first Rocker arm 43 that aforementioned exhaust side cams 40 is shaken; At one end side is provided with air inlet side second Rocker arm 44 of a pair of pushing wrist 44a, the 44b that contact with first and

second suction valve

27,28; At one end side is provided with pushing wrist 45a exhaust side second Rocker arm 45 that contacts with outlet valve 29; The swing movement of air inlet side first Rocker arm 42 is transferred to air inlet side second Rocker arm 44 be arranged at air inlet side drive bar 46 between first and second Rocker

arm

42,44 of air inlet side; The swing movement of exhaust side first Rocker arm 43 is transferred to exhaust side second Rocker arm 45 ground be arranged at exhaust side driveshaft 47 between first and second Rocker

arm

43,45 of exhaust side.

Form first valve cage 48 between cylinder cap 14 and cylinder head cover 15, this first valve cage 48 is accommodated configuration with the top of air inlet side in the aforementioned valve gear 38 and exhaust side second Rocker

arm

44,45, the air inlet side of shaking pivot Zhi Jinqi side and exhaust side second Rocker

arm

44,45 and exhaust side second

pitman arm shaft

58,59 and air inlet side and

exhaust side driveshaft

46,47; The duaspiracle chamber 49 of on crankcase 12, cylinder body 13 and cylinder cap 14 nubbin of valve gear 38 being accommodated is formed on respect to cylinder-bore axis C and opposition sides aforementioned spark plug 26 1 sides of configuration, and forms with cylinder-bore axis C with extending in parallel.

The part in first valve cage 48 will be lubricated in the aforementioned valve gear 38 in order to be housed in, nozzle opening 36 is arranged on the cylinder head cover 15, and the oil that the parts that are housed in first valve cage 48 are lubricated returns the food tray 12a (with reference to Fig. 1) of the bottom that is formed at crankcase 12 through duaspiracle chamber 49.

Air inlet side and exhaust side first Rocker

arm

42,43 are respectively equipped with from cylinder cap 14 sides and begin the roller 54,55 that rolls and contact with air inlet side and exhaust side cams 39,40, and the axis parallel with aforementioned camshaft 41 is arranged on cylinder body 13 and the air inlet side and exhaust side first Rocker arm 56,57 that cover between 50 can joltily be supported by having.On these air inlet sides and exhaust side first Rocker

arm

42,43, the 42a of pushing portion, the 43a that will be positioned at the cup-shaped of aforementioned roller 54,55 opposition sides open in cylinder cap 14 sides, are provided with integratedly respectively.

In the valve gear 38, camshaft 41 is housed in 49 ground, duaspiracle chamber and is configured in cylinder body 13, has on the outer side surface ground that freely is supported on cylinder body 13 with the two end part of the camshaft 41 of the parallel axis of bent axle 10 by ball bearing 51,51 rotations and forms duaspiracle chamber 49 and the lid 50 that cylinder body 13 is connected.

And in that being set on the camshaft 41, slide contact part between air inlet side and exhaust side cams 39,40 and air inlet side first Rocker arm 42 and exhaust side first Rocker arm 43 provides the oily supply passage 37 of lubrication oil.

In order to transmit from the dynamic retarding 1/2 of bent axle 10, be housed in duaspiracle chamber 49 with first by the cam chain 53 of movable sprocket 52, first driving sprocket wheel 60 (with reference to Fig. 1) and annular, can not be connected with the relative rotation with camshaft 41 by movable sprocket 52 first, first driving sprocket wheel 60 can not be connected with the relative rotation with bent axle 10, with cam chain 53 around hanging over first driving sprocket wheel 60 and first by movable sprocket 52.

Air inlet side and

exhaust side driveshaft

46,47 extend between that part of duaspiracle chamber 49 at first valve cage 48, and the space that is configured to cylinder cap 14 sides narrows down.One distolateral balled end of air inlet side and

exhaust side driveshaft

46,47 can embed and combine with the 42a of pushing portion, the 43a of air inlet side and exhaust side first Rocker

arm

42,43 versatilely, and another distolateral balled end of air inlet side and

exhaust side driveshaft

46,47 can embed with compression zone 44c, the 45b of air inlet side and exhaust side second Rocker

arm

44,45 versatilely and combine.

In first valve cage 48 on the cylinder cap 14, the air inlet side and exhaust side second pitman arm shaft 58 that will have the axis parallel with

camshaft

41,59 are configured in the both sides of aforementioned sparger 25, be supported and fixed on the cylinder cap 14, will be at one end side be provided with by with first and

second suction valve

27,28 upper end butt and with two

suction valves

27,28 are connected, be divided into two strands a pair of pushing wrist 44a, air inlet side second Rocker arm 44 of 44b shakes and freely is supported on air inlet side second pitman arm shaft 58, side at one end is provided with exhaust side second Rocker arm 45 by the pushing wrist 45a that is connected with this outlet valve 29 with the upper end butt of outlet valve 29 shakes and freely be supported on exhaust side second pitman arm shaft 59.

And, for air inlet side second pitman arm shaft 58, opposition side at two pushing

wrist

44a, 44b, to be arranged on the other end of air inlet side second Rocker arm 44 in the cup-shaped compression zone 44c that cylinder body 13 sides are opened integratedly, for exhaust side second pitman arm shaft 59, at the opposition side of pushing wrist 45a, the compression zone 45b of the cup-shaped that will open in cylinder body 13 sides is arranged on exhaust side second Rocker arm 45 integratedly.

With the other end of aforementioned air inlet side and exhaust side second Rocker

arm

44,45 is that

compression zone

44c, 45b are configured between the end of air inlet side and exhaust side second

pitman arm shaft

58,59, and air inlet side and

exhaust side driveshaft

46,47 are connected with the other end of air inlet side and exhaust side second Rocker

arm

44,45 between an end of air inlet side and exhaust side second

pitman arm shaft

58,59.

In such valve gear 38, corresponding with the rotation of the camshaft 41 that transmits rotating power from bent axle with 1/2 reduction speed ratio, shake by air inlet side cam 39 air inlet sides first Rocker arm 42, thereby air inlet side drive bar 46 is to this direction action, correspondingly, air inlet side second Rocker arm 44 shakes, thereby first and

second suction valve

27,28 carry out driven for opening and closing, by exhaust side cams 40, exhaust side first Rocker arm 43 shakes, thereby exhaust side driveshaft 47 moves to this axle direction, correspondingly, exhaust side second Rocker arm 45 shakes, thereby outlet valve 29 carries out driven for opening and closing.

Yet, owing to be to supply to sparger 25 from the pressurized air that makes piston 66 on the direction parallel, carry out the reciprocating air pump 61 of reciprocating action with cylinder-bore axis C, so, air pump 61 is configured in the bottom of cylinder body 13 in a side corresponding with the relief opening 24 that is arranged on cylinder cap 14.And, on cylinder body 13, be formed on the vertical plane of cylinder-bore axis C in roughly become L shape ground to be connected with aforementioned duaspiracle chamber 49 and be disposed at the hollow nest 16 of cylinder below operating chamber 62, below duaspiracle chamber 49, the connection that is configured in duaspiracle chamber 49 and operating chamber 62 is provided with portion with aforementioned air pump 61.

Simultaneously with reference to Figure 10, the pump case 63 of air pump 61 is provided with the axis parallel with cylinder-bore axis C, form simultaneously cylinder cap 14 sides open the round-ended cylinder shape arranged, be formed on the cylinder body 13, the cover 64 that the aforementioned cylinder cap 14 side opening portions of this pump case 63 are closed airtightly is connected on the cylinder body 13.And, cover 64 with the same level of the junction plane 87 of cylinder body 13 and cylinder cap 14 on be connected with pump case 63.

Piston 66 can be embedded slidably be connected on the pump case 63, between end of piston 66 and cover 64, form to generate and shrink corresponding pressurized air with volume, be configured in the pump chamber 65 of cylinder cap 14 sides, between the dead end of the other end of piston 66 and pump case 63, form the atmospheric pressure chamber 88 that is disposed at food tray 12a side.

On the other hand, configuration and the parallel axes of camshaft 41 have the bearing part cylindraceous 69 by the axis of aforementioned piston 66 on operating chamber 62, this bearing part 69 by bolt 71... be connected to be based in cylinder body 13 a plurality of, for example on four connecting pin 70....And the lid 72 that will form the exterior lateral sides of operating chamber 62 is connected to cylinder body 13, opens and covers at 72 o'clock, can carry out tightening and unclamping operation of aforementioned bolt 71....

Pump live axle 73 inserted coaxially lead to aforementioned bearings parts 69, roller bearing 74 is installed between end of bearing part 69 and pump live axle 73, ball bearing 75 is installed between the other end of bearing part 69 and pump live axle 73.Just 73 rotations of pump live axle freely are supported on the bearing part 69 that is connected with cylinder body 13.

In the part outstanding from an end of aforementioned bearing part 69, be transferred to the pump live axle from the power of camshaft 41 by power transmission 89, this power transmission 89 is made of following: be fixed on second on the pump live axle 73 by movable sprocket 78; Be connected to camshaft 41 first by movable sprocket 52 all-in-one-pieces second driving sprocket wheel 79; Chain 80 around the annular that hangs over the second passive and driving

sprocket wheel

78,79.

Pump live axle 73 is connected to by dog link formula crank 84 on the piston 66 of air pump 61, and dog link formula crank 84 is can embed the sliding block 68 that combines with piston 66 slidably and form by being connected to from the top of the outstanding eccentric shaft 73a of the eccentric position of an end of pump live axle 73.Pump live axle 73 is rotated with the power that comes from camshaft 41 transmission, and correspondingly eccentric shaft 73a is around the axis rotation of pump live axle 73, the piston 66 of air pump 61 pump case 63 in axially back and forth being driven to increase and decrease the volume of pump chamber 65.

On piston 66, be provided with axis be configured in along one diameter line simultaneously with the sliding eye 67 on the plane of the axis normal of aforementioned camshaft 41, aforementioned sliding block 68 can be embedded slidably is attached to this sliding eye 67.Eccentric shaft 73a is darted at integratedly an end of pump live axle 73.

The opening portion 76 of one end of inserting pump live axle 73 is set on pump case 63, on piston 66, allowable offset axle 73a is set along with the rotation of pump live axle 73 is correspondingly being moved on the direction of the axis of sliding eye 67, the patchhole 77 that eccentric shaft 73a is inserted is by vertical central part of sliding eye 67.

Central part between ball bearing 75 and roller bearing 74, open-work 81,82 is separately positioned on the both sides of bearing part 69, on the position of a corresponding open-work 81, on bearing part 69, be provided with integratedly in order to the part that will fall the oil in the operating chamber 62 and import oily guider 83 between bearing part 69 and the pump live axle 73.Just, guiding the passage 134 that is arranged at cylinder cap 14 with a part that lodges in the oil of the bottom in first valve cage 48 is located on the cylinder cap 14, the passage 135 that will be opened on operating chamber 62 by this passage 134 is arranged on cylinder body 13, makes from oil importing open-work 81 ground that passage 135 falls oily guider 83 is arranged on bearing part 69 integratedly.A part that is imported into the oil between bearing part 69 and the pump live axle 73 is used for the lubricated of roller bearing 74 and ball bearing 75, remaining falls bottom in the operating chamber 62 from open-work 82, thereby the oil that accumulates in the bottom of operating chamber 62 passes through the bottom of operating chamber 62, returns food tray 12a side from the loop 136 that is located at cylinder body 13.

About aforementioned bearings parts 69, opposition side at air pump 61, the water pump 90 that is provided with in the coaxial spin axis of pump live axle 73 is installed on the cylinder body 13,, air pump 61 and water pump 90 is configured in the face of on the position that claims about containing the vertical plane P L of cylinder-bore axis C and pump live axle 73.

The pump case 91 of water pump 90 is made of the pump cover 93 that the ware shape 92b of portion is connected with integratedly the shell main body that forms in the open end that the 92a of round-ended cylinder portion is arranged of cutting out pump live axle 73 sides 92 and closes the open end of closed shell main body 92, pump cover 93 the open end outer circumference portion of shell main body 92 is clamped in and cylinder body 13 between be connected to cylinder body 13.

To freely be supported on the dead end central part of the 92a of round-ended cylinder portion and the central part of pump cover 93 with the two end part rotation of the coaxial pump shaft 94 of pump live axle 73, internal magnet 96 is fixedly installed in this pump shaft 94 is rotated integratedly, be inserted on the rotor 95 in the 92a of round-ended cylinder portion.On the other hand, be fixed on from the other end of the outstanding pump live axle 73 of the other end of bearing part 69 being provided with the rotary component 97 that centers on the cylindrical part 97a that the 92a of round-ended cylinder portion is arranged of aforementioned shell main body 92 coaxially, external magnet 98 be fixedly mounted on the inner face of aforementioned cylindrical part 97a.Thereby rotary component 97 is along with pump live axle 73 is rotated, and correspondingly rotor 95 is along with pump shaft 94 is rotated.

Yet,, be arranged on the rotor 95 so will be housed in the turbine 100 of this vortex chamber 99 owing between shell main body 92 and pump cover 93, form vortex chamber 99.

On pump cover 93, be arranged on a plurality of suction port 101... of the central part opening of vortex chamber 99, will be pressurized by the rotation of turbine 100 from the cooling water of this suction port 101... suction vortex chamber 99.And, to supply to the cylinder cap side water jacket 103 that is arranged on cylinder cap 14 by cylinder body side water jacket 102 and this cylinder body side water jacket 102 that is arranged on cylinder body 13 from the cooling water of water pump 90 ejections, to import the state of not shown water tank etc. from the cooling water that cylinder cap side water jacket 103 is discharged and change by thermostat 104, the thermostat shell 105 of this thermostat 104 will be formed on the pump cover 93 of aforementioned water pump 90 to circuitous temperature of returning the corresponding cooling water of state of suction port 101... such as water tanks.

On the upper portion side wall of the pump case 63 of air pump 61, be provided with a part in order to the oil that will flow through duaspiracle chamber 49 as lubricated with the oily introduction hole 85 that imports in the pump case 63, flow through duaspiracle chamber 49.Yet, because the rotation in the duaspiracle chamber 49, the air inlet side cam 39 and the exhaust side cams 40 of camshaft 41, when the part that will flow through the oil in the duaspiracle chamber 49 is kicked up because action of centrifugal force makes it to separate disperses, or from the fuel feeding road part of 37 oil of supplying with is dispersed because of centrifugal action separates, thereby the spittle of the oil that will separate imports the relative position of oily introduction hole 85 ground setting camshaft 41 and oily introduction hole 85.

In the duaspiracle chamber 49 width of the part corresponding with valve gear 38 than the part beyond it form big, therefore part corresponding with air inlet side cam 39 and exhaust side cams 40 in the camshaft 41 is surrounded the roughly prominent wall 86 of semicircle shape, mutually opposed with the oily circulating direction 137 in the duaspiracle chamber 49, outstanding integratedly being arranged on the cylinder body 13, the oily introduction hole 85 of aforementioned air pump 61 is configured in along oily circulating direction 137 on the positive upstream position of aforementioned prominent wall 86.The effect of prominent wall 86 just is that the oil that will flow through in the duaspiracle chamber 49 imports oily introduction hole 85.

And, piston ring 138 close air-pressure chamber 88 sides that oil introduction hole 85 is slidingly connected at the inner circumference than the excircle that is mounted on piston 66 and pump case 63 in the inner peripheral surface opening of pump case 63, be arranged on the pump case 63, irrelevant with moving axially of piston 66, oily introduction hole 85 often is communicated with an end of the sliding eye 67 that is arranged on piston 66.On the excircle of piston 66, a pair of groove 139... between the two ends of the end of air-pressure chamber 88 sides that connect piston 66 and sliding eye 67 is set, to be used for lubricating between piston 66 and the pump case 63 from the part that oily introduction hole 85 imports the oil of pump case 63, remaining flows into air-pressure chamber 88 sides through aforementioned grooves 139....And aforementioned grooves 139... also can play the sliding block 68 that prevents in the dog link formula crank 84 and produce pumping action because the oil spill in the sliding eye 67 goes out.

The oil that flows to air-pressure chamber 88 to operating chamber 62 side flow, 136 flows to food tray 12a from the loop from opening portion 76 again.

Pay special attention to Fig. 9, sparger 25 be with burner oil be installed in first injection valve 107 of cylinder head cover 15 and directly be formed by connecting coaxially along with pressurized air injects fuel into second injection valve 108 that 19 ground, firing chamber are installed in cylinder cap 14, second injection valve 108 is provided with the outstanding nozzle 108a that enters firing chamber 19.

To make aforementioned nozzle 108a embed the embedding joining hole 109 of combination airtightly, with have than the big internal diameter of this embedding joining hole 109 with embed the insertion tube 110 that joining hole 109 is connected coaxially, be arranged on the cylinder cap 14 with cylinder-bore axis C is coaxial, be inserted into insertion tube 110 from cylinder head cover 15 sides, until with second injection valve 108 its nozzle 108a embed airtightly be attached to embed joining hole 109 in, abut to by wavy spring packing ring 123 and to embed joining hole 109 and to insert the end difference 111 of the ring-type that forms between the tube 110.

With end difference 111 butts before, insert under the state of tube 110, with the top of second injection valve 108 is the outstanding cavity 143 that enters the piston 17 that is positioned at top dead center of nozzle 108a, the top of spark plug 26, when piston 17 is positioned at top dead center, in cavity 143, be positioned at aforementioned nozzle 108a below.

The wire interconnecting piece 108b that will be provided with second injection valve 108 at its rear portion is configured on the otch 110a that is arranged at the rear end of inserting tube 110, outside inserting tube 110, the metal aperture 113 that the couple of conductor 112... that derives from wire interconnecting piece 108b will be clipped between the mating face of cylinder cap 14 and cylinder head cover 15 connects, and moves the outside to.

On the other hand, on cylinder head cover 15, form with first injection valve 107 embed in conjunction with and keep, simultaneously, also with aforementioned second injection valve 108 as and cylinder cap 14 between position the cylindric sparger shell 114 that the positioning part of clamping plays a role, when cylinder head cover 15 connects to cylinder cap 14, with the top of sparger shell 114 and the rear end butt of second injection valve 108.The rear end of sparger shell 114 connect that rearward end with first injection valve 107 is clipped in and sparger shell 114 between grip block 115.

First injection valve 107, at its rear portion Wiring connector 107a is set, the rearward end of first injection valve 107 is clamped with sparger shell 114 and grip block 115, when first injection valve 107 is installed to cylinder head cover 15, aforementioned Wiring connector 107a is configured to face the outside of cylinder head cover 15.

Between the sparger shell 114 and first injection valve 107, form the firing chamber 116 with first injection valve, the 107 interior ring-types that are communicated with, will clamp a pair of sealed member 117,118 of this fuel chambers 116 from both sides and between first injection valve 107 and sparger shell 114, install.

And, on cylinder head cover 15, the fuel supply channel 119 that is communicated with previous combustion chamber 116 being set directly, the pipe 120 that never illustrated fuel supply source imports fuel is connected with fuel supply channel 119 by joint 121.

Between the rearward end of the tip portion of first injection valve 107 and second injection valve 108, be formed in the sparger shell 114 with the air chamber 122 of the ring-types that are communicated with in second injection valve 108, will be provided to this air chamber 122 from the pressurized air of aforementioned air pump 61.

Note Fig. 2 and Figure 10, the suction pipe 124 that the pipe that will import from the air of not shown air-strainer connects is set on the cover 64 of air pump 61, this suction pipe 124 is connected with pump chamber 65 by the pilot valve (not shown) that is built in cover 64.

Correspondingly drive the poppet valve 125 of valve in the 64 built-in pressure increases of aforementioned cover parts, will be provided to air chamber 122 by aforementioned poppet valve 125 and pressurized air supply passage 126 from the pressurized air of air pump 61 ejections along with pump chamber 65.

Pressurized air supply passage 126 by: be communicated with aforementioned poppet valve 125, the one end is connected with cover 64, simultaneously the pipe part 127 that is connected with cylinder cap 14 of the other end; Be connected with pipe part 127, be set directly at the passage 128 of cylinder cap 14; And be communicated with this passage 128, be communicated with air chamber 122 simultaneously, constitute by the passage 129 that is set directly at cylinder head cover 15.

And, to be set directly at the passage 128 of cylinder cap 14, just be disposed at air inlet side in first valve cage 48 and the other end side of exhaust side second

pitman arm shaft

58,59 at the opposition side of two driveshafts, 46,47 sides, be arranged on the cylinder cap 14 with configuration valve gear 38.The part of this passage 128 is by near the relief opening 24, particularly near relief opening 24, cylinder cap side water jacket 103 is configured between relief opening 24 and the cylinder body 13, relative therewith, 128 pairs of relief openings 24 of aforementioned channels are set with the opposition side by aforementioned cylinder cap side water jacket 103.

Cylinder cap 14 and cylinder head cover 15 are inserted in the two end part of cylindric locating stud 130 that stride across the mating face of cylinder cap 14 and cylinder head cover 15, constitute the part of compressed air channel 126, the passage 128,129 that is set directly at cylinder cap 14 and cylinder head cover 15 is connected by aforementioned locating stud 130.And will be clipped in the mating face of cylinder cap 14 and cylinder head cover 15 around the O type ring 133 of locating stud 130.

Form throttle orifice 131 in locating stud 130, the relief valve 132 that is connected with the aforementioned channels 128 of these throttle orifice 131 upstream sides is installed on the cylinder cap 14.

Next this embodiment's effect is described, because with first and

second suction valve

27,28 and outlet valve 29, with these

valves

27,28,29 action axis is provided on the cylinder cap 14 in the mode that becomes the configuration of V word shape on the projection drawing of the imaginary plane that comprises cylinder-bore axis C with can carrying out on-off action, and be provided with second injection valve 108 of the axis parallel with cylinder-bore axis C, inject fuel directly into firing chamber 19, at

suction valve

27,28 and valve air valve 29 between be installed in cylinder cap 14, so, the fuel that second injection valve 108 sprays can be focused near the center of firing chamber 19, can realize that lean combustion reduces fuel cost.And, because second injection valve 108 can be directly injected to firing chamber 19 in company with pressurized air together with fuel,, can improve flammability so fuel more pelletizing is ejected into the firing chamber.

Be three suction valves 27 with odd number as a whole, 28 and outlet valve 29 be provided in cylinder cap 24, with the less side's of number valve be that outlet valve 29 is installed to cylinder head 14 with spark plug 26 side by side, therefore dispose spark plug 26 by the space that produces of effectively utilizing outlet valve 29 on every side, can increase the degrees of freedom in spark plug 26 configurations, and because can be with spark plug 26 near second injection valve 108, injected fuel spray from second jet pump 108 can be focused near the center of firing chamber 19 in addition, thereby can further reduce fuel cost by the stratiform rarefaction.

And, spark plug 26 with first and second suction port 20,21 of configuration arranged side by side in and distolateral i.e. first suction port 21 of column direction the position of 19 misalignment is installed in cylinder cap 14 from the firing chamber in corresponding, at first suction port 21 around the opening end of firing chamber 19, guide wall 142 is arranged on the roof 19a of firing chamber 19, this guide wall 142 makes and flows into from first suction port 21 that the air inlet of firing chambers 19 is circuitous to be flow through spark plug 26 ground and lead.

Therefore, flow into the air inlet of firing chamber 19 from first suction port 21, the guide wall 142 of roof 19a by firing chamber 19 is directed to, make a circulation in spark plug 26 flows through firing chamber 19, can in firing chamber 19, not disperse air inlet because of colliding with spark plug 26, the mixed gas in the firing chamber 19 is not stirred, thereby can realize lean combustion, can further reduce fuel cost.

Because, the central part in the face of the face of firing chamber 19 at piston 17 is provided with cavity 143, with direct second injection valve 108 to firing chamber 19 burner oils, a pair of suction port 20,21, the relief opening 22 of corresponding second suction port 21, and spark plug 26, by two suction ports 20,21, relief opening 22 and spark plug 26 are provided in cylinder cap 14 with second injection valve 108 with surrounding, therefore, by 19 central part disposes second injection valve 108 and spark plug 26 in the firing chamber, realize the compactness of the cavity 143 of piston 17, the laminarization that has improved mixed gas has improved compression ratio, thereby improved combustion efficiency, reduced fuel cost.

Because, the sparger 25 that will comprise second injection valve 108 is configured on the cylinder-bore axis C, on projection drawing perpendicular to the plane of cylinder-bore axis C, first suction port 20 and relief opening 22 are configured in the both sides of sparger 25, simultaneously with another straight line L2 of the straight line L1 approximate vertical that links second suction port 21 and relief opening 22 on, first suction port 20 is configured in a side of sparger 25, so, by sparger 25 being configured in the central part of firing chamber 19, can eliminate the deviation of the flame travel in the firing chamber 19, improve combustion efficiency, because first and second suction port 20 is set, 21, can improve fills with air efficient, reduce the suction loss, and can avoid two suction valves 27 at an easy rate, the interference ground configuration spark plug 26 of 28 and outlet valves 29, spark plug 26 can be configured near sparger 25, thereby improve combustion efficiency.

Owing to possess the outstanding cavity 143 that enters the piston 17 that is positioned at top dead center in top of the nozzle 108a of second injection valve 108, therefore be ejected in the cavity 143 by the mixed gas that will contain miniaturization fuel, more improve combustion efficiency, further reduced fuel cost.

Because will give prominence to the roof 19a that are arranged on firing chamber 19 at piston 17 side-prominent juts 144, the top that feasible tops of giving prominence to firing chamber 19 from jut 144 are configured in second injection valve 108 is that the ground, below on the top of nozzle 108a is installed in cylinder cap 14 with spark plug 26.So in cavity 143, be the top of spark plug 26 be configured in second injection valve 108 below structure, can suppress to reduce the influence of eddy current in the firing chamber 19, prevent the stirring that the mixed gas imbalance causes, the laminarization state of higher proportions of ingredients can be formed on the bottom in cavity 143, improve ignition performance, further reduce fuel cost by the rarefaction burning.And cavity 143 deepens towards spark plug 26 sides, therefore has denseer mixed gas in spark plug 26 sides, can further improve ignition performance.

With an end and

suction valve

27,28 and outlet valve 29 link and be configured in suction valve 27 with linking, 28 and outlet valve 29 between air inlet side and exhaust side

second Rocker arm

44,45, shaking pivot respectively props up at air inlet side that is fixed in cylinder cap 14 and exhaust side second pitman arm shaft 58, on 59, be configured in and two pitman arm shafts 58, the a pair of air inlet side and the exhaust side driveshaft 46 of the position of an end correspondence of 59,47, respectively with air inlet side and exhaust side

second Rocker arm

44,45 the other end is connected, therefore only will drive

suction valve

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

second Rocker arm

44,45 and air inlet side and exhaust side second

pitman arm shaft

58,59 are provided on the cylinder cap 14, can realize the miniaturization of cylinder cap 14.

Aforementioned air inlet side and

exhaust side driveshaft

46,47 at aforementioned air inlet side and exhaust side second pitman arm shaft 58, an axial side of 59, be driven in the rotation of the camshaft 41 that is configured in cylinder body 13, move in the axial direction, the space that dwindles cylinder cap 14 sides is configured, simultaneously at air inlet side and exhaust side second pitman arm shaft 58, between 59 with air inlet side and exhaust side

second Rocker arm

44,45 the other end is connected, therefore can be with air inlet side and exhaust side second pitman arm shaft 58, it is narrower that interval between 59 is set, along with air inlet side and exhaust side second pitman arm shaft 58, the cylinder cap 14 of the direction that 59 axis connects can be realized miniaturization.

Aforementioned spark plug 26, relate to the sparger 25 that comprises aforementioned second injection valve 108, at air inlet side and

exhaust side driveshaft

46,47 opposition side, be installed in cylinder cap 14, owing to so dispose spark plug 26, by configuration air inlet side and exhaust side

second Rocker arm

44,45, with air inlet side and

exhaust side driveshaft

46,47 the portion that is connected, avoided the less partly configuration spark plug 26 of clearance spaces, increased the degrees of freedom in spark plug 26 configurations, and, because can be with spark plug 26 near second injection valve 108, injected fuel spray from second injection valve 108 can be focused near the center of firing chamber 19 in addition, thereby further reduce fuel cost by lean combustion.

Between the cylinder cap 14 and cylinder head cover 15 of a part that constitutes engine main body 11, first valve cage 48 of configuration is accommodated the part of valve gear 38 in formation, in engine main body 11 on crankcase 12, cylinder body 13 and the cylinder cap 14, formation will be housed in the valve gear 38 the duaspiracle chamber 49 that oil that the parts in first valve cage 48 are lubricated turns back to the food tray 12a of the bottom that is formed at crankcase 12, in the side of the hollow nest 16 of cylinder, extend abreast with cylinder-bore axis C.And be disposed at duaspiracle chamber 49 below the pump case 63 of air pump 61 on, with duaspiracle chamber 49 be provided with communicatively a part in order to the oil that will flow through duaspiracle chamber 49 as lubricated with the oily introduction hole 85 that imports in the hollow nest of cylinder.

The part that therefore can really a part of lubricating valve gear 38 be turned back to the oil of food tray 12a afterwards imports the oily introduction hole 85 of air pump 61, positively brings into play the lubrication of air pump 61 with simple structure.

Owing to form pump case 63 comparing on the less cylinder body of profile 13 with cylinder cap 14 and crankcase 12, reduced part number, can realize the miniaturization of motor integral body, the connection of duaspiracle chamber 49 and oily introduction hole 85 is easy, has simplified structure from oil to air pump 61 that supply with.

On duaspiracle chamber 49, accommodate in order to will from the power transmission of bent axle 10 to the camshaft 41 of valve gear 38 first by movable sprocket 52, first driving sprocket wheel 60 and cam chain 53, adopted as drainback passage by the duaspiracle chamber 49 of movable sprocket 52, first driving sprocket wheel 60 and cam chain 53 accommodating first, thereby can realize the miniaturization of motor and simplify structure to air pump 61 fuel feeding.

Camshaft 41 accommodated be configured in the duaspiracle chamber 49, the oily spittle that will separate by action of centrifugal force with the rotation along with this camshaft 41 imports the mode of oily introduction hole 85 sides, set the relative position of cam 41 and oily introduction hole 85, thereby because the oil that flows through in the duaspiracle chamber 49 is lubricated cam 41 well, simultaneously, the oily spittle that will disperse effectively by the rotation of camshaft 41 imports air pump 61, and air pump 1 lubricated has good improvement.

Between the pump live axle 73 and camshaft 41 that connect air pump 61, be provided with the power transmission of camshaft 41 actuating unit 89 to pump live axle 73, to drive the camshaft 41 of air pump 61 near air pump 61 configurations, simplify the structure of actuating unit 89, realized the miniaturization of motor.

And, also camshaft 41 is configured on the less cylinder body of profile 13, can contribute more to some extent the miniaturization of motor, will can be compact from the power transmission of camshaft 41 to power transmission 89 structures of air pump 61, increased the degrees of freedom that the gear ratio of air pump 61 is set simultaneously.Therefore and the range-independence between camshaft 41 and the pump live axle 73 in addition, power transmission 89 is the structures that adopt endless chain 80 transmission power,, can prevent the maximization of cylinder body 13, reduces part number.

The outstanding setting and the relative prominent wall 36 of oily circulating direction 137 in the duaspiracle chamber 49 on cylinder body 13, the oil of the bottom in the duaspiracle chamber 49 is imported oily introduction hole 85, effectively oil is imported oily introduction hole 85 by prominent wall 86, can further improve the lubricated of air pump 61.

Because air pump 61 constitutes reciprocating structure, can obtain higher air pressure.Transmission is connected on the piston 66 by dog link formula crank 84 from the pump live axle 73 that makes piston 66 carry out the power of reciprocating action in the direction parallel with cylinder-bore axis C of camshaft 41, so, the action axis and the cylinder-bore axis C of air pump 61 are parallel, adopt dog link formula crank 84 simultaneously, do not need connecting rod, can realize the miniaturization of motor.

Air pump 61 correspondingly generates pressurized air and is configured in the pump chamber 65 of aforementioned cylinder cap 14 sides and by food tray 12a both ends of the surface is constituted to the piston 66 of the air-pressure chamber 88 that is disposed at this food tray 12a side by shrinking along with volume, free sliding ground embeds and is combined on the pump case 63, be mounted on the excircle of piston 66 piston ring 138 that the inner circumference with pump case 63 is slidingly connected near air-pressure chamber 88 sides at this, oily introduction hole 85 is opened on the inner circumference of pump case 63, therefore finish the lubricated oil in the air pump 61, pumping action by piston 66 is successfully discharged to food tray 12a side from air-pressure chamber 88, thereby the efficiency of movement that can improve air pump 61 reaches lubricated.

With the pump case 63 of air pump 61 make with cylinder cap 14 sides open the round-ended cylinder shape arranged, be integrally formed on the cylinder body 13, the cover 64 of the cylinder cap 14 side opening portions of gastight closing pump case 63 combines with pump case 63 on the same plane of the junction plane 87 of cylinder body 13 and cylinder cap 14, thereby can reduce the machining period of cylinder body 13.

About the plane P L vertical that comprise cylinder-bore axis C with pump live axle 73 in the face of the position that claims on, air pump 61 and water pump 90 that configuration is connected with the two end part of pump live axle 73, therefore adopt the pump live axle 73 that is connected with air pump 61 to drive water pump 90, can reduce part number and realize lightweight, can reduce cost by simplifying processing and assembling.And can control of pump 90 give prominence to from cylinder body, can avoid the maximization of cylinder body 13 integral body.

And water pump 90 can be configured in should the cylinder body 13 and cylinder cap 14 of water-cooled near, shorten water pipe, avoided the complicated while of pipeline can subtract the intratubular pressure loss.

In addition, since with fuel along with the sparger 25 that the pressurized air that obtains at air pump 61 is directly injected to firing chamber 19 together is provided in cylinder cap 14, on cylinder cap 14, do not set air pump 61, therefore increase the miniaturization of configuration degrees of freedom realization motor, sparger 25 or its pipe arrangement can be provided in cylinder cap 14.Especially, the pump chamber 65 of air pump 61 is configured in cylinder cap 14 sides, comparatively shorten between pump chamber 65 and the sparger 25, avoid pressurized air is imported from air pump 61 pipeline structure that comprises pressurized air supply passage 126 complicated of spargers 25, can reduce the pressure loss of aforementioned pipeline structure.

The part of aforementioned pressurized air supply passage 126 is by near the relief opening 24, therefore flow through the exhaust heat heating of the exhausting air that the pressurized air of pressurized air supply passage 126 can be by flowing through relief opening 24, thereby increased the efficient that compressed-air actuated volume has improved pump.

And, near relief opening 24, the part of cylinder cap side water jacket 103 is configured between relief opening 24 and the cylinder body 13, relative therewith, constitute the passage 128 and the opposition side of relief opening 24 relevant configuration of the part of aforementioned pressurized air supply passage 126 at cylinder cap side water jacket 103, therefore can do one's utmost to avoid because the pressurized air of pressurized air supply passage 126 is entreated and flow through in the influence of the cooling that cylinder cap side water jacket 103 causes, even water-cooled engine also can be kept higher pump efficiency.

Air pump 61 is provided in the bottom of cylinder body 13 in corresponding relief opening 24 1 sides, air pump 61 can be configured in the configuration space of the motor that comprises the outlet pipe that is connected with relief opening 24.

Yet, sparger 25 is by with burner oil and be installed in first injection valve 107 of cylinder head cover 15 and fuel be directly injected to firing chamber 19 together along with pressurized air and be installed in second injection valve, 108 coaxial being formed by connecting of cylinder cap 14, when carrying out the fuel injection by the air boosting, as long as in turn first and second injection valve 107,108 is installed in cylinder head cover 15 and cylinder cap 14, therefore installation exercise is not numerous and diverse, also can reduce part number.And, as long as guarantee second injection valve 108 is installed in space on the cylinder cap 14, be installed on the cylinder cap with the valve body that two injection valves will be housed and compare, on cylinder cap 14, need can to reduce the installing space guaranteed, cylinder cap 14 is realized that miniaturizations contribute to some extent.

First injection valve 107 embeds with sparger shell 114 and combines and maintenance in the sparger 25, this sparger shell 114 is formed on cylinder head cover 15, therefore around cylinder cap 14, need not to dispose the parts that constitute sparger shell 114, part number can be reduced, the maximization of motor and numerous and diverseization of motor surrounding structure can be avoided simultaneously.

Second injection valve 108 is inserted cylinder cap 14, be clipped in simultaneously between the top and cylinder cap 14 of sparger shell 114, therefore second injection valve 108 is inserted cylinder cap 14 from cylinder head cover 15 sides, only cylinder head cover 15 is combined with cylinder cap 14, just cylinder cap 14 positions second injection valve 108 relatively, the operation that second injection valve 108 is installed to cylinder cap 14 becomes easily, can improve installation exercise.

First injection valve 107 makes Wiring connector 107a be installed on the cylinder head cover 15 in the face of cylinder head cover 15 other places, the metal aperture 113 that the lead 112... that is connected with second injection valve 108 will be clipped between cylinder cap 14 and the cylinder head cover 15 connects, move the outside to, therefore, second injection valve 108 is installed on cylinder cap 14, to insert from the lead 112... that second injection valve 108 extends under the state that leads to metal aperture 113 cylinder head cover 15 and cylinder cap 14 bindings simultaneously, again by first injection valve 107 is installed to cylinder head cover 15, just can finish and comprise to two injection valves 107,108 carry out the installation of distribution, have improved installation more.

Form the air chamber 122 that the pressurized air will import second injection valve 108 stores between first and second injection valve 107,108 in sparger shell 114, use with the pressurized air that pressurized air is imported second injection valve 108 and supply with a part of dual-purpose of constructing on sparger shell 114.

With providing the part of fuel and compressed-air actuated fuel supply channel 119 and pressurized air supply passage 126 to sparger shell 114 respectively is that passage 129 is set directly on the cylinder head cover 15, therefore around sparger shell 114, needn't dispose respectively and provide fuel and compressed-air actuated pipeline etc. to sparger shell 114, also can reduce part number, avoid the complicated of the maximization of motor and motor surrounding structure simultaneously.

It is distolateral at another of air inlet side and exhaust side second

pitman arm shaft

58,59 to be passage 128 with the part of pressurized air supply passage 126, be arranged on the cylinder cap 14, avoided valve gear 38, the part of pressurized air supply passage 126 is arranged on the cylinder cap 14, thereby can avoids the maximization of cylinder cap 14.

The camshaft 41 that constitutes the part of valve gear 38 is avoided being configured on the cylinder body 13 between cylinder cap 14 and the cylinder head cover 15, and valve gear 38 drives first suction valve 27, second suction valve 28 and the outlet valve 29 that is provided in cylinder cap 14.Therefore, between cylinder cap 14 and cylinder head cover 15, do not dispose camshaft 41, can increase the configuration degrees of freedom of sparger shell 114, can increase the fuel supply channel 119 that is set directly at cylinder head cover 15 and the configuration degrees of freedom of passage 129.

Second injection valve 108 in the sparger 25 is supported on the cylinder head cover 15, to provide the part of compressed-air actuated pressurized air supply passage 126 to this second injection valve 108 is that passage 129 is set directly on the cylinder head cover 15, around cylinder head cover 15, do not dispose the parts that pressurized air imported sparger 25, can avoid the maximization of motor and the structure complicated around the motor.

Cylinder cap 14 and cylinder head cover 15 are inserted in the two end part of locating stud cylindraceous 130 that stride across the mating face of cylinder cap 14 and cylinder head cover 15, a part that constitutes compressed air channel 126 is connected by aforementioned locating stud 130 at cylinder cap 14 and the cylinder head cover 15 direct passages of installing 128,129 respectively, thereby relative position by locating stud 130 decision cylinder caps 14 and cylinder head cover 15, even sparger 25 concerted action on cylinder head cover 15 and cylinder cap 14 is supported, sparger 25 is not produced excessive stress yet.Locating stud 130 is used as the connected element of the passage 129 of the passage 128 of cylinder cap 14 and cylinder head cover 15, need the minimizing of number of spare parts not contributed to some extent in order to the special-purpose member of connecting passage.

Form metal aperture 131 in locating stud 130, therefore can adjust the compressed-air actuated pressure that provides to sparger 25, and carry out this pressure when adjusting, not special-purpose part is not contributed to some extent to the minimizing of number of spare parts.

More than introduced embodiments of the invention, yet the present invention is not limited only to the foregoing description, on the basis that does not deviate from the record of summary of the invention scope, can carries out all design alterations.

According to first aspect present invention, from one of a plurality of suction ports air inlet that promptly flows into the firing chamber from a distolateral suction port, the guide wall of the roof by the firing chamber is directed to walks around spark plug, flows through in the firing chamber, thereby may realize lean combustion, reduces fuel cost.

According to second aspect present invention, injection valve and spark plug are configured in the firing chamber central part, realize the compactness of cavity, improve the laminarization and the compression ratio of mixed gas, thereby improved combustion efficiency, can further reduce fuel cost.

According to third aspect present invention,, the fuel miniaturization can be supplied to the firing chamber, and the mixed gas by will comprising miniaturization fuel can further improve combustion efficiency to the cavity internal spraying of piston, reduce fuel cost.

According to fourth aspect present invention, can suppress the influence of eddy current in the firing chamber, prevent mixed gas because the uneven stirring that causes, can form the laminarization state of denseer proportions of ingredients in the bottom in the aforementioned cavity, improve ignition performance, thereby, reduce fuel cost by bigger lean combustionization.

Claims

1. four stroke engine, on the cylinder cap (14) that is provided with a pair of suction port (20,21) that is opened on firing chamber (19), attachment face is characterized in that the spark plug (26) of described firing chamber (19),

In correspondence side by side in a pair of suction port (20,21) of configuration and a distolateral suction port (21) of column direction and on the misalignment of firing chamber (19) and position near the center of firing chamber (19), spark plug (26) is installed in cylinder cap (14), forms independent relief opening (22) in position near the suction port (20) that is different from described one distolateral suction port (21) in a pair of suction port (20,21);

At described one distolateral suction port (21) around the opening end of firing chamber (19), guide wall (142) is arranged on the roof (19a) of firing chamber (19), and described guide wall (142) makes that the air inlet that flows into to firing chamber (19) from described one distolateral suction port (21) is circuitous to be flow through described spark plug and lead (26);

The central part of facing the face of firing chamber (19) at piston (17) is provided with cavity (143), to be configured on the cylinder cap (14) to the injection valve (108) of described firing chamber (19) direct fuel injection, a pair of suction port (20,21) and described spark plug (26), and make described a pair of suction port (20,21), relief opening (22) and spark plug (26) surround described injection valve (108);

The described injection valve (108) that will spray by the fuel that pressurized air is atomized is provided on the cylinder cap (14) so that the mode of the cavity (143) of the piston (17) that is positioned at top dead center is charged on the top;

The jut (144) that is projected into piston (17) side is arranged on the roof (19a) of firing chamber (19) highlightedly, and described spark plug (26) is installed in cylinder cap (14), makes its top be disposed at the below on the top of described injection valve (108).