CN107110103A - Uniflow type two-cycle engine - Google Patents

Abstract

A kind of uniflow type two-cycle engine possesses：Cylinder, it internally forms combuster；Piston, it is slided in cylinder；Scavenging port a, side of the stroke direction of its piston in cylinder is set, and active gases accordingly is sucked into combustion chamber with the sliding action of piston；And fuel injection portion (126), it is located on the outside of the radial direction of cylinder compared with scavenging port, and the active gases spray fuel gas to being sucked by scavenging port, and fuel injection portion possesses：Inner tube (156), it has inleakage and outside endoporus, and fuel gas is directed into inside；Outer tube (158), it has inleakage and outside exit orifice, internally accommodates inner tube together to form dual pipe with inner tube；And drive division (154), it changes the relative position of inner and outer tubes, so that amount of opening changes, amount of opening is the endoporus area overlapping with exit orifice.

Description

Uniflow type two-cycle engine

Technical field

This disclosure relates to which fuel gas is together followed with active gases from the uniflow type in the suction cylinder of scavenging port is double Ring engine.

The application is based in Japanese Patent Application 2014-224455 and Japanese Patent Application filed in 4 days November in 2014 of Japan No. 2014-224456 and claim priority, and their content is incorporated herein.

Background technology

In the uniflow type two-cycle engine that the internal combustion engine for also serving as ship is used, the piston stroke side in cylinder Scavenging port is provided with to a side, and exhaust port is provided with another side.If moreover, by activity in air-breathing (supply) stroke Gas sucks combustion chamber from scavenging port, then the exhaust gas produced by combustion with the active gases that is sucked from The mode that exhaust port is released is vented.

In such a uniflow type two-cycle engine, it will be the fuel gas of gaseous fuel as fuel that exploitation, which has, And from scavenging port side to supplying fuel gas in cylinder, and the indirect technology to combustion chamber spray fuel gas.For example, special In engine described in sharp document 1, the upside of the scavenging port in the outer wall of cylinder is formed with the circumferential direction extension along cylinder Ring chamber.In addition, blast tube extends to the inside of scavenging port from inwall of the chamber through scavenging port.If the control connected with chamber Valve processed is opened, then supplies fuel gas to intracavitary by control valve, and from chamber by blast tube to spray fuel in scavenging port Gas.

Prior art literature

Patent document

Patent document 1：No. 3908855 publications of Japanese Patent Publication No..

The content of the invention

The invention problem to be solved

In the composition described in patent document 1, stop the injection of fuel gas by closing control valve.But, residue in Fuel gas in chamber, blast tube is after closing control valve also from scavenging port injection.That is, closed from control valve to fuel gas The injection of body virtually completely stops, and produces delay.

The disclosure is in view of such a problem, its object is to provide promptly stagnate the single current scavenging of fuel gas injection Formula two-cycle engine.

The solution used to solve the problem

First method involved by the uniflow type two-cycle engine of the disclosure possesses：Cylinder, it is internally formed with burning Room；Piston, it is slided in cylinder；Scavenging port a, side of the stroke direction of its piston in cylinder is set, the cunning with piston Active gases is accordingly sucked combustion chamber by action；And fuel injection portion, it is located at the radial direction of cylinder compared with scavenging port On the outside of direction, and the active gases spray fuel gas to being sucked by scavenging port, in addition, fuel injection portion possesses：Inner tube, its With inleakage and outside endoporus, fuel gas is directed into inside；Outer tube, it has inleakage and outside outer Hole, internally accommodates inner tube together to form dual pipe with inner tube；And drive division, it becomes the relative position of inner and outer tubes Change, so that amount of opening changes, amount of opening is the endoporus area overlapping with exit orifice.

Invention effect

According to the uniflow type two-cycle engine of the disclosure, it can promptly stop the injection of fuel gas.

Brief description of the drawings

Fig. 1 is the figure being monolithically fabricated for showing uniflow type two-cycle engine；

Fig. 2 is the figure for the composition for showing the scavenging near ports in Fig. 1；

Fig. 3 is the figure for illustrating gas spray valve；

Fig. 4 is Fig. 2 IV-IV line sectional view；

Fig. 5 A are the figures for illustrating fuel injection portion；

Fig. 5 B are the figures for illustrating fuel injection portion；

Fig. 6 A are the sectional views of inner tube and outer tube；

Fig. 6 B are the sectional views of inner tube and outer tube；

Fig. 7 is the first figure for illustrating the position relationship of endoporus and exit orifice；

Fig. 8 is the second figure for illustrating the position relationship of endoporus and exit orifice；

Fig. 9 A are the figures for the relative position change for periodically showing inner and outer tubes；

Fig. 9 B are the figures for the relative position change for periodically showing inner and outer tubes；

Fig. 9 C are the figures for the relative position change for periodically showing inner and outer tubes；

Fig. 9 D are the figures for the relative position change for periodically showing inner and outer tubes；

Figure 10 A are the figures for illustrating the aperture of the scavenging port in the disclosure and the relation of mixture strength；

Figure 10 B are the figures for illustrating the aperture of the scavenging port in comparative example and the relation of mixture strength；

Figure 11 A are for illustrating the endoporus in the first variation and the figure of exit orifice；

Figure 11 B are for illustrating the endoporus in the first variation and the figure of exit orifice；

Figure 12 A are for illustrating the endoporus in the second variation and the figure of exit orifice；

Figure 12 B are for illustrating the endoporus in the second variation and the figure of exit orifice；

Figure 13 A are for illustrating the endoporus in the 3rd variation and the figure of exit orifice；

Figure 13 B are for illustrating the endoporus in the 3rd variation and the figure of exit orifice；

Figure 14 A are the figures for illustrating the fuel injection portion in the 4th variation；

Figure 14 B are for illustrating the endoporus in the 4th variation and the figure of exit orifice；

Figure 15 A are the figures for illustrating the fuel injection portion in the 5th variation；

Figure 15 B are for illustrating the endoporus in the 5th variation and the figure of exit orifice；

Figure 16 A are the figures for illustrating the fuel injection portion in the 6th variation；

Figure 16 B are for illustrating the endoporus in the 6th variation and the figure of exit orifice；

Figure 17 is the figure being monolithically fabricated for showing uniflow type two-cycle engine；

Figure 18 is Figure 17 II-II line sectional views；

Figure 19 is the enlarged drawing of Figure 17 dotted portion；

Figure 20 is the figure for showing fuel distribution tube and switching mechanism in Figure 19；

Figure 21 A are the figures for illustrating the opening and closing of fuel injection orifice；

Figure 21 B are the figures for illustrating the opening and closing of fuel injection orifice；

Figure 21 C are the figures for illustrating the opening and closing of fuel injection orifice；

Figure 22 A are the figures for illustrating the aperture of the scavenging port in the disclosure and the relation of mixture strength；

Figure 22 B are the figures for illustrating the aperture of the scavenging port in comparative example and the relation of mixture strength.

Embodiment

Hereinafter, the preferred embodiment of the disclosure is described in detail with reference to accompanying drawings.Size shown in such a embodiment, Material, other concrete numerical values etc. are merely used for making the understanding of the disclosure readily to illustrate, except situation about especially stating in advance In addition, the disclosure is not limited.In addition, in this specification and accompanying drawing, for substantially the same function, constitute will Element, repeat specification is omitted by being accompanied by identical symbol, is illustrated in addition pair with omitting elements of the disclosure without direct relation.

Fig. 1 is the figure being monolithically fabricated for showing uniflow type two-cycle engine 100.The single current scavenging of present embodiment Formula two-cycle engine 100 is such as ship.Specifically, uniflow type two-cycle engine 100 is included with bottom Divide and constitute：Cylinder 110, piston 112, exhaust port 114, air bleeding valve 116, scavenging port 118, scavenging room 120, gas supply pipe 122nd, gas spray valve 124 and fuel injection portion 126.

In uniflow type two-cycle engine 100, in the two strokes of the upward stroke and descending stroke of piston 112 Between, be exhausted, air-breathing, compression, burning, expansion, piston 112 slided in the cylinder 110.Piston rod 112a one end is fixed on Piston 112.In addition, crosshead (not shown) is linked to the piston rod 112a other end, crosshead and the together reciprocal shifting of piston 112 It is dynamic.If with moving back and forth for piston 112, crosshead is moved back and forth, then moves back and forth gearing, crank axle rotation (not shown) with this Turn.

Exhaust port 114 is the opening portion that the cylinder head 110a in the top compared with the top dead-centre of piston 112 is set, and it is opened and closed For the exhaust gas after the burning produced in combustion chamber 128 is exhausted.Air bleeding valve 116 is driven by air bleeding valve and filled Put 116a and slided up and down with set timing, so that exhaust port 114 is opened and closed.When exhaust port 114 is opened, gas is vented Body is vented via exhaust port 114 from cylinder 110.

Scavenging port 118 is to extend through outer peripheral face from the inner peripheral surface (cylinder liner 110b inner peripheral surface) of the lower end side of cylinder 110 Hole, and it is provided with multiple throughout the whole surrounding of cylinder 110.Moreover, the sliding action of scavenging port 118 and piston 112 accordingly will In active gases suction cylinder 110.The active gases includes the oxidants such as oxygen, ozone, or its gaseous mixture (such as air).

Fig. 2 is the figure for showing the composition near the scavenging port 118 in Fig. 1.As shown in Fig. 2 scavenging port 118 is located at cylinder It is located at the part in scavenging room 120 among 110.The active gases (such as air) compressed by hair-dryer (not shown) is directed into Scavenging room 120.

Therefore, if corresponding with the sliding action of piston 112, scavenging port 118 is opened, then passes through scavenging room 120 and cylinder 110 Interior differential pressure, from scavenging room 120 by scavenging port 118 by active gases suction cylinder 110.It is inhaled into the active gas of cylinder 110 Body is directed into combustion chamber 128 by piston 112.

Gas supply pipe 122 connects respectively with being reserving with the fuel reservoir (not shown) and gas spray valve 124 of fuel gas It is logical, fuel gas is directed to gas spray valve 124 from fuel reservoir.

Fig. 3 is the figure for illustrating gas spray valve 124.As shown in figure 3, in the body 124a of gas spray valve 124 Portion, is configured with hydraulic piston 130, is separated by hydraulic piston 130 in the body 124a hydraulic pressure chambers 132 being internally formed and spring Room 134.Moreover, hydraulic piston 130 can be in body 124a inside to the side of hydraulic pressure chamber 132 and the Slideslip of spring housing 134.

Hydraulic pressure chamber 132 is connected with working tubing 136, is filled with the working oil supplied from working tubing 136.Hydraulic piston 130 are gone up direction into Fig. 3 by the working oil in hydraulic pressure chamber 132 pushes.

In addition, being configured with spring members 138 in spring housing 134, spring members 138 are connected to being hit by a bullet for hydraulic piston 130 The side of spring room 134.Moreover, the force of spring members 138 acts on hydraulic pressure along the direction resisted with the pushing force caused by working oil Piston 130.

So as to, if the hydraulic pressure for being supplied to the working oil of hydraulic pressure chamber 132 becomes strong, the hydraulic piston 130 pushed by working oil Into Fig. 3, upside is mobile in body 124, if hydraulic pressure dies down, and by the force of spring members 138, hydraulic piston 130 is at this Into Fig. 3, downside is mobile in body 124a.

In addition, working oil blow-by tube 140 is communicated to hydraulic piston 130, with the movement of hydraulic piston 130 from hydraulic pressure chamber 132 working oils spilt discharge body 124a outside by working oil blow-by tube 140.

Moreover, among body 124a inside, the upside in figure 3 compared with spring housing 134 is formed with gas compartment 142, Gas compartment 142 is linked with the circulation path 122a connected with gas supply pipe 122, and is supplied fuel from gas supply pipe 122 Gas.

The connection pipe arrangement 148 connected with fuel injection portion 126 is connected to the body 124a of gas spray valve 124 one end Side, gas compartment 142 is connected by the connected entrance 124b formed in body 124a one end with connecting pipe arrangement 148.

Valve body 146 is formed with one end of axle 144, valve body 146 is located at connected entrance 124b outside.In addition, axle 144 Another side be fixed on hydraulic piston 130, from gas compartment 142 to spring housing 134 run through body 124a.Gas blow-by tube 150 Connected with spring housing 134, the fuel gas for escaping to spring housing 134 from gas compartment 142 is discharged to originally by gas blow-by tube 150 Outside body 124a.

Moreover, if as described above, hydraulic piston 130 is accordingly moved with hydraulic pressure, then valve body 146 makes connected entrance 124b Opening and closing.Thus, gas spray valve 124 makes valve body 146 work by hydraulic pressure, to start or stop to go from gas supply pipe 122 Toward the fuel gas supply of connection pipe arrangement 148.

In addition, as shown in Fig. 2 fuel injection portion 126 has fuel distribution tube 152 and drive division 154.Fuel distribution tube 152 with Connection pipe arrangement 148 is connected, and the fuel gas that circulation is supplied from connection pipe arrangement 148.Drive division 154 is by making fuel distribution tube 152 It is opened and closed to control the injection of the fuel gas from fuel distribution tube 152.

Fig. 4 is Fig. 2 IV-IV line sectional view.In Fig. 4, in order to be readily appreciated that, the section of fuel distribution tube 152, which simplifies, to be shown Go out, describe the internal structure of fuel distribution tube 152 in detail afterwards.As shown in figure 4, fuel distribution tube 152 is set compared with scavenging port 118 On the outside of the radial direction of cylinder 110, to the active gases spray fuel gas sucked by scavenging port 118.

In the example shown in Figure 4, fuel distribution tube 152 configures the outer surface of cylinder 110 between adjacent scavenging port 118 Radial direction on the outside of, the flowing of active gases becomes to be difficult to be hindered by fuel distribution tube 152.

Although in the example shown in Figure 4, illustrating that fuel distribution tube 152 and scavenging port 118 configure equal number of feelings Condition, but fuel distribution tube 152 and the configuration number of scavenging port 118 can also be different, for example, it is also possible to each two scavenging port 118 set a fuel distribution tube 152.

Fig. 5 A and B are the figures for illustrating fuel injection portion 126.As shown in Fig. 5 A and B, fuel distribution tube 152 is by inner tube 156 Constituted with outer tube 158.Fuel gas is directed into the inside of inner tube 156, and outer tube 158 internally accommodates inner tube 156 and and inner tube 156 together form dual pipe.

The external diameter of inner tube 156 is more slightly smaller than the internal diameter of outer tube 158, and the outer peripheral face of inner tube 156 and the inner peripheral surface of outer tube 158 are substantially Abutted throughout entire surface.In addition, among inner tube 156, front end (tip) opening of downside, the body of outer tube 158 in Fig. 5 A and B 158a inside is connected with the body 156a of inner tube 156 inside via the opening.

Outer tube 158 is connected with the connection pipe arrangement 148 shown in Fig. 3, and fuel gas is supplied to outer tube 158 from connection pipe arrangement 148. It is directed into the body that the fuel gas inside the body 158a of outer tube 158 flows into inner tube 156 from the front end (lower end) of inner tube 156 Inside 156a.

Drive division 154 possesses two hydraulic pressure chambers 160,162 and separates the hydraulic piston 164 of two hydraulic pressure chambers 160,162.Separately Outside, axle 166 is fixed on hydraulic piston 164, and the cardinal extremity (upper end) of inner tube 156 is fixed among axle 166 in Fig. 5 A and B before downside Side.

If since the state shown in Fig. 5 A, the hydraulic pressure for being supplied to the working oil of hydraulic pressure chamber 160 becomes strong, then such as Fig. 5 B institutes Show, the downside into Fig. 5 A and B of axle 166 is mobile, therewith, the downside into Fig. 5 A and B of inner tube 156 is mobile.

If on the contrary, since the state shown in Fig. 5 B, the hydraulic pressure for being supplied to the working oil of hydraulic pressure chamber 162 becomes strong, then as schemed Shown in 5A, the upside into Fig. 5 A and B of axle 166 is mobile, therewith, and the upside into Fig. 5 A and B of inner tube 156 is mobile.In this way, drive division 154 make above-below direction (that is, the stroke direction of the piston 112 in cylinder 110 into Fig. 5 A and B of inner tube 156.Hereinafter sometimes referred to simply as Stroke direction) it is mobile, so that inner tube 156 and the change of the relative position of outer tube 158.

Fig. 6 A and B are the sectional views of inner tube 156 and outer tube 158, are made in Fig. 5 A and B by the position of dotted line widdershins It is rotated by 90 ° and shows.That is, in Fig. 6 A and B, right side is the bottom dead centre side (side of stroke direction) of piston 112, and left side is The top dead-centre side (another side of stroke direction) of piston 112.As shown in Fig. 6 A and B, inner tube 156 has the sheet of inner tube 156 The body 156a inside and outside endoporus 174 run through, outer tube 158, which has, passes through the inside and outside of body 158a of outer tube 158 The exit orifice 176 worn.Endoporus 174 and exit orifice 176 are separated and provided with multiple in stroke direction (left and right directions in Fig. 6 A and B) respectively.

As shown in Figure 6A, if endoporus 174 and exit orifice 176 are overlapping, pass through in the fuel gas of the internal circulation of inner tube 156 Endoporus 174 and exit orifice 176 are sprayed from fuel distribution tube 152, and are collaborated with the active gases that is sucked by scavenging port 118.

Then, if inner tube 156 is along stroke direction, the left side (the top dead-centre side of piston 112) into Fig. 6 A and B is mobile, such as schemes Shown in 6B, it is changed into endoporus 174 and the whole misaligned states of exit orifice 176, the injection of the fuel gas from fuel distribution tube 152 stops Only.In this way, drive division 154 changes amount of opening, amount of opening is the area overlapping with exit orifice 176 of endoporus 174.As a result, fuel is matched somebody with somebody The opening portion opening and closing that fuel gas is sprayed among pipe 152, it is thus possible to promptly stop fuel gas in the case where not postponing The injection of body.

Fig. 7 is the first figure for illustrating the position relationship of endoporus 174 and exit orifice 176, and showing will be identical with Fig. 6 A and B Position be configured to the outward appearance of direction identical with Fig. 6 A and B.I.e., in the figure 7, right side is bottom dead centre side (the stroke side of piston 112 To a side), left side be piston 112 top dead-centre side (another side of stroke direction).It is shown in phantom in Fig. 7 to be contained in outside The contour line of the inner tube 156 of pipe 158.

As shown in fig. 7, multiple exit orifice 176 are circular and diameter with the cross sectional shape vertical through direction of outer tube 158 Identical, on the other hand, the length of the stroke direction of multiple endoporus 174 is different.Specifically, in the top dead-centre side (figure of piston 112 Left side in 7) endoporus 174 that is formed is compared with the endoporus 174 of the bottom dead centre side of piston 112 (in Fig. 7 right side) formation, stroke side To length it is long.Moreover, the rightmost side (in Fig. 7, n-th) endoporus 174 is vertical through direction with inner tube 156 since left Cross sectional shape and exit orifice 176 be same shape.

In Fig. 7, the 1st since the left side~two ends of the stroke direction of (n-1) individual endoporus 174 are diameter and the phase of exit orifice 176 It is rectilinear form between the shape of same semi arch, two semi arches.The length of the stroke direction of the part of the rectilinear form exists It is different in each endoporus 174.

Moreover, the interval P of adjacent exit orifice 176 is certain.In addition, the semi arch on the left of from Fig. 7 among endoporus 174 The interval A at center to the center of corresponding exit orifice 176 be all certain in any endoporus 174 and corresponding exit orifice 176.

Moreover, as shown in fig. 7, endoporus 174 be located at left side compared with corresponding exit orifice 176 and it is misaligned when, will be from interior The interval at center to the center of exit orifice 176 of the semi arch on right side is set to B in Fig. 7 among hole 174.On interval B, by Fig. 7 In order since the left side with symbol (B₁、B₂、B₃...B_N-1, B_n) show.Now, it is B₁＜ B₂＜ B₃＜ ... ＜ B_N-1＜ B_n Relation.

Fig. 8 is the second figure for illustrating the position relationship of endoporus 174 and exit orifice 176.In fig. 8, in order to be readily appreciated that, The symbol for representing endoporus 174 and exit orifice 176 is omitted, endoporus 174 is shown with hachure, and exit orifice 176 is shown with intersecting hachure.Separately Outside, in fig. 8, right side is the bottom dead centre side (side of stroke direction) of piston 112, and left side is the top dead-centre side of piston 112 (another side of stroke direction).In addition, the internal diameter of exit orifice 176 is set into d, the stroke direction length of endoporus 174 is set to L, The order since the left side is shown with symbol in fig. 8.

Moreover, the internal diameter d of the short exit orifice 176 of length L compared with left adjacent endoporus 174 in Fig. 8 of endoporus 174.Now, exit orifice 176 interval P is bigger than by the quantity n of exit orifice 176 (n+1) and internal diameter d for adding 1 product.

If since the state for the position A that whole endoporus 174 and exit orifice 176 are completely superposed, endoporus 174 is to piston 112 The mobile exit orifice 176 in top dead-centre side (in Fig. 8 left side) internal diameter d and be changed into B state, then since the left side n-th it is (most right Side) endoporus 174 and exit orifice 176 become not overlapping.

And if then each mobile internal diameter d of the such inner tube 156 of image position C, position D, since Fig. 8 right side endoporus 174 Become not overlapping with exit orifice 176 successively.Finally, in the state of the X of position, all endoporus 174 become not weigh with exit orifice 176 It is folded.

Fig. 9 A~D is the figure for the relative position change for periodically showing inner tube 156 and outer tube 158.In Fig. 9 A~D, Right side be piston 112 bottom dead centre side (side of stroke direction), left side for piston 112 top dead-centre side (stroke direction Another side).If from as shown in Figure 9 A, whole endoporus 174 start with the nonoverlapping state of exit orifice 176, and inner tube 156 is to piston 112 bottom dead centre side (in Fig. 9 A~D right side) is mobile, then as shown in Figure 9 B, (in figure A ~ D9 left from the top dead-centre side of piston 112 Side) start first endoporus 174 start it is overlapping with exit orifice 176.

If further, inner tube 156 is moved to the bottom dead centre side of piston 112, then as shown in Figure 9 C, from the upper dead of piston 112 First and second endoporus 174 of beginning is overlapping with exit orifice 176 and is fully open, the 3rd endoporus for point side (left side in Fig. 9 A~D) 174 beginnings are overlapping with exit orifice 176.

If the mobile progress of inner tube 156, finally as shown in fig. 9d, whole endoporus 174 is overlapping and complete with exit orifice 176 Ground opening.Afterwards, inner tube 156 is returned, and is moved towards the top dead-centre side of piston 112, Fig. 9 A shape is periodically transitted to from Fig. 9 D State.

In this way, endoporus 174 and exit orifice 176 are open successively since the top dead-centre side (left side in Fig. 9 A~D) of piston 112, After the endoporus 174 of whole is overlapping and completely open with exit orifice 176, from the bottom dead centre side (right side in Fig. 9 A~D) of piston 112 Remain silent successively.

Here, among the position that inner tube 156 is overlapped with outer tube 158, being located opposite from a side (Fig. 9 A of stroke direction In~D right side), and endoporus 174 and exit orifice 176 it is overlapping formed by open area be referred to as low discharge open area Os.

In addition, among the position that inner tube 156 is overlapped with outer tube 158, piston is located at compared with the Os of low discharge open area The open area of 112 top dead-centre side (left side in Fig. 9 A~D) is referred to as big flow open area Ob.Here, low discharge open region Domain Os and big flow open area Ob are the region for including the size set in advance in exit orifice 176, outer tube 158 respectively.

In addition, forming big flow open area Ob endoporus 174 and exit orifice 176 with forming the interior of low discharge open area Os Hole 174 and exit orifice 176 are separated in stroke direction respectively.

Now, big flow open area Ob endoporus 174 and exit orifice 176 are formed with forming the interior of low discharge open area Os Hole 174 and exit orifice 176 are compared positioned at the top dead-centre side (left side in Fig. 9 A~D) of piston 112.Therefore, big flow open area Ob The state overlapping for a long time with exit orifice 176 of endoporus 174 is in a ratio of with low discharge open area Os.In addition, big flow open area Ob is compared with the Os of low discharge open area, and endoporus 174 and exit orifice 176 are relatively early overlapping, and the coincidence of endoporus 174 and exit orifice 176 is slower Release.

Figure 10 A and B are the figures for illustrating the aperture of scavenging port 118 and the relation of mixture strength.In Figure 10 A and B In, above-below direction represents the stroke direction of piston 112, upside and the top dead-centre side (another side of stroke direction) of piston 112 Correspondence, downside is corresponding with the bottom dead centre side (side of stroke direction) of piston 112.

Scavenging port 118 is as shown in Figure 10 A and B with the chart of port openings area, and aperture area passes through piston 112 Position and change.When starting opening in scavenging port 118, among scavenging port 118, opened from the top dead-centre side of piston 112 Begin opening, and bottom dead centre side is finally opened.Moreover, when starting to remain silent in scavenging port 118, among scavenging port 118, from piston 112 bottom dead centre side starts to remain silent, and top dead-centre side is finally closed.

As a result, that as shown in Figure 10 A and B with the chart of scavenging air amount of scavenging air amount (scavenging active gases amount) Sample, proportionally changes with port openings area.Now, in the comparative example shown in Figure 10 B, such as the chart institute of gas injection amount As showing, the emitted dose and port openings area of fuel gas are disproportionate.Therefore, as in Figure 10 B with mixture strength As chart is shown, the fuel gas and the concentration of the gaseous mixture of active gases flowed into from scavenging port 118 partly thickens.

In the present embodiment, as shown in Figure 10 A, inner tube 156 and the ordinatedly displacement of port openings area.Knot Really, during the aperture area of scavenging port 118 becomes big, as described above, the top dead-centre of endoporus 174 and exit orifice 176 from piston 112 Side starts to be open successively, if the aperture area of scavenging port 118 diminishes, and endoporus 174 and exit orifice 176 are from the lower dead of piston 112 Point side starts to remain silent successively.

Therefore, as shown in Figure 10 A in the chart of gas injection amount, the emitted dose of fuel gas and active gas The amount of body increases and decreases generally proportionately.Therefore, it is possible to the mixing of the fuel gas and active gases that will be flowed into from scavenging port 118 The concentration of gas remains substantially certain.

In addition, as described above, the big flow open area Ob positioned at top dead-centre side is opened with the low discharge positioned at bottom dead centre side Mouth region domain Os is in a ratio of the state overlapping for a long time with exit orifice 176 of endoporus 174.Therefore, the opening time among scavenging port 118 Long top dead-centre side, increases the emitted dose of the fuel gas from big flow open area Ob, to seek the equal of mixture strength Homogenize.

In addition, as described above, big flow open area Ob is compared with the Os of low discharge open area, endoporus 174 and exit orifice 176 Relatively early overlapping, the coincidence of endoporus 174 and exit orifice 176 is released later.Therefore, it is possible to the opening and closing away from scavenging port 118 closer to Regularly, it is opened and closed big flow open area Ob and endoporus 174 and exit orifice 176 in the Os of low discharge open area, with spray fuel Gas.

Figure 11 A and B are for illustrating the endoporus 274 in the first variation and the figure of exit orifice 276.As shown in Figure 11 A and B, In the first variation, endoporus 274 and exit orifice 276 in corresponding relation hang down with inner tube 156 and outer tube 158 through direction Straight cross sectional shape is same shape, is rectangle respectively.Moreover, above-below direction in endoporus 274 and Figure 11 A and B of exit orifice 276 Length (along the length in the direction vertical with stroke direction) top dead-centre side is longer than bottom dead centre side, the figure of endoporus 274 and exit orifice 276 The length (along the length of stroke direction) of left and right directions is identical in 11A and B.

As shown in Figure 11 A, since the state that whole endoporus 274 and exit orifice 276 are closed, as shown in Figure 11 B, endoporus 274 and exit orifice 276 coincidence when, the amount of opening of top dead-centre side becomes larger.

That is, big flow open area Ob is opened compared with the Os of low discharge open area from endoporus 274 and the overlapping of exit orifice 276 Begin to end, amount of opening is big all the time.Therefore, it is possible to increase the flow phase of the active gases to being flowed among scavenging port 118 The amount for the fuel gas penetrated to many top dead-centre side sprays, suppresses the relatively little of bottom dead centre side of flow of the active gases to being flowed into The amount of the fuel gas of injection, to seek the homogenization of mixture strength.

Figure 12 A and B are for illustrating the endoporus 374 in the second variation and the figure of exit orifice 376.As shown in Figure 12 A and B, In the second variation, relative to an exit orifice 376 for forming toroidal, provided with four endoporus 374 for forming toroidal.Separately Outside, in multiple exit orifice 376, the internal diameter of top dead-centre side is maximum, and internal diameter slowly diminishes towards bottom dead centre side.

Moreover, in the state of shown in Figure 12 A, in endoporus 374, since away from the near endoporus 374 of corresponding exit orifice 376 Internal diameter slowly becomes big.

If as shown in 12B, inner tube 156 is moved to bottom dead centre side, then one in four endoporus 374 overlaps with exit orifice 376, If inner tube 156 is further moved to bottom dead centre side, after the coincidence of endoporus 374 and exit orifice 376 is temporarily released, next endoporus 374 and exit orifice 376 overlap.In this way, relative to one exit orifice 376, multiple endoporus 374 are overlapped successively, and spray fuel gas.

Now, the internal diameter of exit orifice 376 is that top dead-centre side is larger, and the endoporus 374 overlapped with exit orifice 376 internal diameter with going Become big successively toward top dead-centre, thus, as inner tube 156 is moved to bottom dead centre side, the big flow open area Ob of top dead-centre side Compared with the Os of low discharge open area, aperture area becomes big stepsly.Moreover, as inner tube 156 is returned and to top dead-centre side Mobile, the aperture area of top dead-centre side diminishes stepsly.

Figure 13 A and B are for illustrating the endoporus 474 in the 3rd variation and the figure of exit orifice 476.As shown in Figure 13 A and B, In the 3rd variation, endoporus 474 and exit orifice 476 are respectively formed with each one.

Moreover, among exit orifice 476 in Figure 13 A and B above-below direction amplitude (amplitude in the direction vertical with stroke direction) From top dead-centre side towards bottom dead centre side decrescence.On the other hand, among endoporus 474 in Figure 13 A and B the amplitude of above-below direction from top dead-centre Side is substantially certain to bottom dead centre side.

If from as shown in FIG. 13A, the state that endoporus 474 and exit orifice 476 are not overlapped starts, as shown in Figure 13 B, inner tube 156 Moved to bottom dead centre side, then endoporus 474 and exit orifice 476 are overlapped at leisure.

Now, due to the difference of the amplitude of above-below direction in Figure 13 A and B of exit orifice 476, big flow open area Ob and rill Measure open area Os big compared to amount of opening.In addition, big flow open area Ob is same with above-mentioned embodiment, with low discharge opening Region Os is in a ratio of the state overlapping for a long time with exit orifice 476 of endoporus 474, it is thus possible to seek the homogenization of mixture strength.

Moreover, big flow open area Ob is compared with the Os of low discharge open area, endoporus 474 and exit orifice 476 are relatively early overlapping, The coincidence of endoporus 474 and exit orifice 476 is released later, it is thus possible to the opening and closing away from scavenging port 118 closer to timing make big stream Amount open area Ob and endoporus 474 and exit orifice 476 in the Os of low discharge open area are opened and closed.

Figure 14 A and B are the figures for illustrating the fuel injection portion 526 in the 4th variation.The fuel of above-mentioned embodiment Ejection section 126 is stopped by the overlapping injection to make fuel gas of the endoporus 174 of inner tube 156 and the exit orifice 176 of outer tube 158. On the other hand, in the 4th variation, as shown in Figure 14 A, except the endoporus 174 and the exit orifice 176 of outer tube 158 of inner tube 156 Outside overlapping, also stop the injection of fuel gas by valve body 572.

Specifically, in fuel injection portion 526, between hydraulic pressure chamber 162 and inner tube 156, gas compartment 568 is formed with, Connection pipe arrangement 148 shown in the connected graph 3 of gas compartment 568, and supplied fuel gas from connection pipe arrangement 148.Gas compartment 568 Connected with the body 158a of outer tube 158 inside.

Configured among axle 166 and be formed with valve body 572 at the position of gas compartment 568, with the movement of axle 166, valve body Portion 572 is opened and closed the connected component of gas compartment 568 and outer tube 158.

In addition, the base end side (upper end side) of inner tube 156 is conical surface 556b, conical surface 556b internal diameter of the external diameter than outer tube 158 Ninor feature into.Be communicated with hole 556c in conical surface 556b, via intercommunicating pore 556c, the body 158a of outer tube 158 inside with it is interior The body 156a of pipe 156 inside connection.

As shown in Figure 14B, if valve body 572 is opened, by the intercommunicating pore 556c of inner tube 156, it is directed into outer tube 158 Body 158a inside fuel gas flow into inner tube 156 body 156a inside.

Spring members 570 are configured in gas compartment 568, as shown in Figure 14B, by being opened if valve body 572 if make force edge The direction in valve body portion 572 acts on valve body 572 to aid in the movement of the axle 166 caused by hydraulic pressure.

In this way, in fuel injection portion 526, except inner tube 156 endoporus 174 and outer tube 158 exit orifice 176 it is overlapping it Outside, the injection of fuel gas is also stopped by valve body 572.As a result, can reliably avoid coming from fuel injection portion 526 Fuel gas spill.

Figure 15 A and B are the figures for illustrating the fuel injection portion 626 in the 5th variation.In above-mentioned 4th variation In fuel injection portion 526, relative to fuel distribution tube 152, gas compartment 568 configure with hydraulic pressure chamber 160,162 identical sides, lead to An axle 166 is crossed, inner tube 156 and valve body 572 are simultaneously mobile.

On the other hand, in the 5th variation, as shown in Figure 15 A and B, split it is provided with and is fixed on inner tube 156 and hydraulic pressure The axle 666a of the piston 164 and axle 666b provided with valve body 672.Axle 666b is lived by hydraulic mechanism (not shown) and hydraulic pressure Plug 164 is mobile independently along above-below direction (stroke direction) in Figure 15 A and B, so that valve body 672 is opened and closed.

Figure 16 A and B are the figures for illustrating the fuel injection portion 726 in the 6th variation.The fuel of above-mentioned embodiment Ejection section 126 moves inner tube 156 by hydraulic pressure.On the other hand, in the 6th variation, as shown in Figure 16 A and B, do not carry Hydraulic mechanism.

The end of upside (stroke direction above) in Figure 16 A and B among outer tube 758, is formed with internally prominent prominent Go out portion 758a.Protuberance 758a upsides in Figure 16 A and B with configuration compared with the position of inner tube 756 is accommodated in outer tube 758.Separately Outside, a protuberance 758a part extends to the side of inner tube 756, and with forming the upper interior in Figure 16 A and B among inner tube 756 Guiding groove 756a be fitted together to.Although by protuberance 758a and guiding groove 756a, inner tube 756 is relatively revolved relative to outer tube 758 The movement turned is restricted, but inner tube 756 can be moved above-below direction along along Figure 16 A and B.

Among inner tube 756 in Figure 16 A and B downside dead end, and be fixed with spring members from the outside of inner tube 756 One end of 770 (force bodies).The other end of spring members is fixed on adjustment part 780, by the fastening of nut N, to adjustment portion The position of part 780 is adjusted, so as to adjust the bullet along stroke direction (direction of the elastic deformation of spring members 770) The position of the other end of spring part 770.

Moreover, spring members 770 make along the direction parallel with the change direction of the relative position relative to outer tube 758 ( This be Figure 16 A and B in upside) push (force) inner tube 756 force act on.

In addition, the spring housing 782 of configuration spring members 770 connects with scavenging room 120, pass through the active gases that is compressed Pressure, inner tube 756 is by the upside pushing into Figure 16 A and B.On the other hand, fuel gas, inner tube are supplied to the inside of inner tube 756 756 by the pressure of fuel gas by into Figure 16 A and B downside push.

If since the state shown in Figure 16 A, inner tube 756 by being directed into the pressure of the fuel gas of inner tube 756 and The direction resisted by edge with pushing force caused by the force and the pressure of active gases as spring members 770 is (under in Figure 16 A and B Direction) push, then by the pressure change of fuel gas, as shown in fig 16b, the relative position of inner tube 756 and outer tube 758 becomes Change.

In this way, in the 6th variation, it is not necessary to set hydraulic mechanism in fuel injection portion 726, fuel gas can be passed through The pressure of body changes inner tube 756 and the relative position of outer tube 758, can reduce cost.

More than, preferred embodiment of this disclosure is illustrated referring to the drawings, but without superfluous words, the disclosure is not limited to Such a embodiment.Obviously, those skilled in the art can expect various modifications in the category described in claims Or fixed case, it is believed that they also would naturally fall within scope of the presently disclosed technology.

For example, in the above-described embodiment, illustrating to make the movement of inner tube 156,756 so that inner tube 156,756 and outer tube 158th, the situation of 758 relative position change.However, it is also possible to make the movement of outer tube 158,758 so that inner tube 156,756 and outer tube 158th, 758 relative position change.

In addition, in above-mentioned 3rd variation, illustrating that endoporus 474 and exit orifice 476 set the situation of each one respectively.But It is, if as above-mentioned embodiment and other variations, by endoporus 174,274,374 and exit orifice 176,276,376 edge respectively Stroke direction separatedly sets multiple, then can suppress inner tube 156,756, the intensity decreases of outer tube 158,758.

In addition, though in above-mentioned embodiment and variation, illustrating that drive division 154 makes inner tube 156,756 along stroke The situation of direction movement, it is also possible to make inner tube 156,756 or outer tube 158,758 along the direction beyond stroke direction, for example, interior The circumferential direction rotation of pipe 156,756.But by making inner tube 156,756 or outer tube 158,758 be moved along stroke direction, can Construction simplification is set to cut down cost.

In addition, after the aperture of scavenging port is mobile and cumulative with the stroke direction for going to bottom dead centre side of piston, If piston is returned from bottom dead centre towards top dead-centre side, aperture is decrescence.In this way, changing with the aperture of scavenging port, at scavenging end During the once opening and closing of mouth, from the changes in flow rate of the active gases in the suction cylinder of scavenging port.If however, such as above-mentioned patent document 1 like that, during the once opening and closing of scavenging port, with substantially certain injection pressure injection fuel gas, then in fuel gas It is local deep or light with being produced in the gaseous mixture of active gases.

Due to such a situation, therefore preferably provide the fuel gas that can seek to be sucked during the once opening and closing of scavenging port The uniflow type two-cycle engine of the homogenization of the concentration of body and active gases.

In order to solve the above problems, in the disclosure there is provided a kind of uniflow type two-cycle engine, it possesses：Cylinder, It internally forms combuster；Piston, it is slided in cylinder；The one of piston stroke direction among gas-swept space, its encirclement cylinder Side, and it is directed the active gases of compression；Scavenging port, its be located at cylinder among be located at gas-swept space in part, and with work Active gases is accordingly sucked combustion chamber by the sliding action of plug from gas-swept space；Fuel injection orifice, it is compared with scavenging port On the outside of the radial direction of cylinder, and the active gases spray fuel gas to being sucked by scavenging port；And switching mechanism, its With the aperture with scavenging port and produce first position and the pressure change second smaller than first position of pressure change The pressure differential put accordingly is opened and closed fuel injection orifice.

Thereby, it is possible to seek the concentration of the fuel gas that sucks and active gases during being once opened and closed of scavenging port Homogenization.

First position can be located in scavenging port.

The second place can be the position separated compared with fuel injection orifice from scavenging port.

The uniflow type two-cycle engine is also equipped with：Inner tube, it has inleakage and outside endoporus, and internal It is directed fuel gas；And outer tube, it has inleakage and outside exit orifice, internally accommodate inner tube and with the similar shape of inner tube one Into dual pipe, fuel injection orifice is overlapping and formed by endoporus and exit orifice, switching mechanism by the pushing force caused by pressure differential come Change the relative position of inner and outer tubes, so that the aperture area change of fuel injection orifice also may be used.

If the differential pressure increase of the second place and first position, inner tube is pushed towards a side of stroke direction, if differential pressure Reduce, then inner tube is pushed by the another side towards stroke direction and also may be used.

Hereinafter, the preferred embodiment of above-mentioned uniflow type two-cycle engine is described in detail with reference to accompanying drawings.It is such a Size, material, other concrete numerical values shown in embodiment etc. are merely used for making the understanding of the disclosure readily to illustrate, and remove Beyond situation about especially stating in advance, the disclosure is not limited.In addition, in following record, for substantially the same Function, the key element constituted, omit repeat specification, in addition to being wanted with the disclosure without direct relation by being accompanied by identical symbol Element omits diagram.

Figure 17 is the figure being monolithically fabricated for showing uniflow type two-cycle engine 1100.

The uniflow type two-cycle engine 1100 of present embodiment is such as ship.Specifically, single current is swept Gas formula two-cycle engine 1100 is constituted comprising following part：Cylinder 1110, piston 1112, exhaust port 1114, air bleeding valve 1116th, scavenging port 1118, scavenging reservoir 1120 (gas-swept space), scavenging room 1122 (gas-swept space), combustion chamber 1124, combustion Expect pipe arrangement 1126 and switching mechanism 1128.

In uniflow type two-cycle engine 1100, in the two rows of the upward stroke and descending stroke of piston 1112 Between journey, be exhausted, air-breathing, compression, burning, expansion, piston 1112 slided in the cylinder 1110.Piston rod 1112a one end It is fixed on piston 1112.In addition, crosshead (not shown) is linked to the piston rod 1112a other end, crosshead and piston 1112 Together move back and forth.If with moving back and forth for piston 1112, crosshead is moved back and forth, then moves back and forth gearing with this, do not scheme The crank axle rotation shown.

Exhaust port 1114 is the opening portion that the cylinder head 1110a in the top compared with the top dead-centre of piston 1112 is set, its It is opened and closed that the exhaust gas after the burning produced in cylinder 1110 is exhausted.Air bleeding valve 1116 is driven by air bleeding valve Device 1116a and slided up and down with set timing so that exhaust port 1114 is opened and closed.When exhaust port 114 is opened, row Gas gas is vented by exhaust port 1114 from cylinder 1110.

Scavenging port 1118 is to extend through outer peripheral face from the inner peripheral surface (cylinder liner 1110b inner peripheral surface) of the lower end side of cylinder 1110 Hole, and throughout cylinder 1110 it is whole around provided with multiple.Moreover, scavenging port 1118 is corresponding with the sliding action of piston 1112 Ground is by active gases suction cylinder 1110.The active gases includes the oxidants such as oxygen, ozone, or its gaseous mixture (such as sky Gas).

The active gases (such as air) compressed by hair-dryer (not shown) is cooled down by cooler 1130 and is enclosed scavenging Reservoir 1120.Compression and cooling active gases by configure the rectification of cowling panel 1132 in scavenging reservoir 1120 it Afterwards, moisture is removed by drain separator 1134.

Scavenging room 1122 is connected with scavenging reservoir 1120, and including the stroke direction of piston 1112 among cylinder 1110 (with Under, be simply referred to simply as sometimes " stroke direction ") a side (in Figure 17 downside), be guided to compression, cooling and The active gases that moisture is removed.

Here, scavenging reservoir 1120 and scavenging room 1122 constitute gas-swept space.Gas-swept space is brought to the work of compression Property gas, and surround the space of a side (in Figure 17 downside) for the stroke direction of piston 1112 among cylinder 1110.Herein, although make For one of gas-swept space by scavenging reservoir 1120, scavenging room 1122 for for example, if but gas-swept space is directed compression Active gases, and surround cylinder 1110 among the stroke direction of piston 1112 a side space, then be not limited to scavenging reservoir 1120th, scavenging room 1122.

Scavenging port 118 is located at the part in scavenging room 1122 among cylinder 1110 (cylinder liner 1110b), with piston 112 sliding action correspondence, is sucked active gases from scavenging room 1122 by the differential pressure in scavenging room 1122 and cylinder 1110 In cylinder 1110.The active gases for being inhaled into cylinder 1110 is directed into combustion chamber 1124 by piston 112.

Figure 18 is Figure 17 II-II line sectional views.In figure 18, in order to be readily appreciated that, the section letter of fuel distribution tube 1126 Change is shown, describes the internal structure of fuel distribution tube 1126 in detail afterwards.As shown in figure 18, fuel distribution tube 1126 and scavenging port 1118 compare on the outside of the radial direction of cylinder 1110 (cylinder liner 1110b).

In the example shown in Figure 18, fuel distribution tube 1126 is configured outside the cylinder 1110 between adjacent scavenging port 1118 On the outside of the radial direction on surface, the flowing of active gases becomes to be difficult to be hindered by fuel distribution tube 1126.

Although in the example shown in Figure 18, illustrating that fuel distribution tube 1126 and scavenging port 1118 configure equal number of Situation, but fuel distribution tube 1126 and the configuration number of scavenging port 1118 can also be different, for example, it is also possible to each two scavenging end Mouth 1118 sets a fuel distribution tubes 1126.

The side of exhaust port 1114 (upside in Figure 17), is configured with ring-type pipe arrangement 1136 among fuel distribution tube 1126.Ring-type Pipe arrangement 1136 is the pipe arrangement annularly surrounded on the outside of the radial direction of cylinder 1110 along the circumferential direction of cylinder 1110, and and fuel distribution tube 1126 connections.By Fuelinjection nozzle 1138, ring-type pipe arrangement 1136 is guided from the fuel reservoir 1140 for being reserving with fuel gas Fuel gas.

Ring-type pipe arrangement 1136 is connected with each fuel distribution tube 1126, and aftermentioned fuel injection orifice is formed with fuel distribution tube 1126, The fuel gas for flowing into fuel distribution tube 1126 via ring-type pipe arrangement 1136 from fuel reservoir 1140 is sprayed from fuel distribution tube 1126 To the active gases sucked by scavenging port 1118.As a result, fuel gas is together inhaled with active gases from scavenging port 1118 Enter in cylinder 1110, and be directed into combustion chamber 1124.

In addition, as shown in figure 17, pilot injection valve 1142 is provided with cylinder head 1110a.Moreover, the phase in cycle of engine Time point is hoped to spray appropriate fuel oil from pilot injection valve 1142.The fuel oil gasifies because of the heat of combustion chamber 1124, is changed into Fuel gas.Moreover, the fuel gas of fuel oil gasification catches fire naturally, burnt within the extremely short time, make combustion chamber 1124 Extreme temperatures.As a result, can make to be directed to the fuel gas of combustion chamber 1124 from scavenging port 1118 with desired timing Reliably burn.The bulbs of pressure caused by the main burning by the fuel gas because being guided from scavenging port 1118 of piston 1112 And move back and forth.

Here, fuel gas for example makes LNG (liquefied natural gas) gasify and generate.In addition, in fuel gas, being not limited to LNG, for example, can also be applicable makes the gas of the gasifications such as LPG (liquefied petroleum gas), light oil, heavy oil.

Figure 19 is the enlarged drawing of Figure 17 dotted portion.As shown in figure 19, fuel distribution tube 1126 is by inner tube 1144 and outer tube 1146 are constituted.Inner tube 1144 is connected with ring-type pipe arrangement 1136 via the communication path 1148 of upside in Figure 19, by fuel gas Body is directed to inside the body 1144a of inner tube 1144 from ring-type pipe arrangement 1136.Outer tube 1146 is in body 1146a inner containment Pipe 1144 simultaneously together forms dual pipe with inner tube 1144.

Inner tube 1144 has the endoporus 1150 of body 1144a inside and outside connection, and outer tube 1146 has body The exit orifice 1152 of 1146a inside and outside connection.The front end occlusion of downside, is directed into inner tube in Figure 19 of inner tube 1144 Fuel gas inside 1144 body 1144a is detained in body 1144a inside, until endoporus 1150 and the weight of exit orifice 1152 Close.Moreover, if endoporus 1150 and exit orifice 1152 are overlapped, fuel gas is ejected into fuel by endoporus 1150 and exit orifice 1152 and matched somebody with somebody Outside pipe 1126.

That is, it is overlapping and form fuel injection orifice 1154 by endoporus 1150 and exit orifice 1152,1154 pairs of quilts of fuel injection orifice The active gases spray fuel gas that scavenging port 1118 is sucked.As noted previously, as fuel distribution tube 1126 and scavenging port 1118 compare located at cylinder 1110 radial direction on the outside of, therefore fuel distribution tube 1126 formation fuel injection orifice 1154 also with scavenging Compare on the outside of the radial direction of cylinder 1110 port 1118.

Switching mechanism 1128 makes inner tube 1144 and the relative position of outer tube 1146 to the stroke direction of piston 1112 (in Figure 19 Above-below direction) change, so that endoporus 1150 and exit orifice 1152 are overlapping, so that fuel injection orifice 1154 is open, and by making weight It is folded to release to make fuel injection orifice 1154 remain silent.

Specifically, switching mechanism 1128, which has, is fixed on outer tube 1146 front (downside in Figure 19, and piston 1112 Bottom dead centre side) body 1128a.Spring members 1156 are configured in body 1128a inside.

One end of spring members 1156 is connected to the leading section of inner tube 1144, and the other end is connected to be formed in body 1128 Partition wall 1158.Moreover, spring members 1156 make the force of the top dead-centre side pushing to piston 1112 relative to inner tube 1144 Effect.

In addition, in body 1128a inside, Liang Ge balancing gate pits are provided with bottom dead centre side compared with spring members 1156 1160、1162.Liang Ge balancing gate pits 1160,1162 are continuously provided along the stroke direction of piston 1112 and by 1164 points of partition member Every the elastic deformation by the pressure differential between Liang Ge balancing gate pits 1160,1162 of partition member 1164.

Partition member 1164 is fixed in one end of axle 1166, and the other end of axle 1166 runs through partition wall 1158 and is projected into bullet The side of spring part 1156, in face of the leading section of inner tube 1144.By the pressure differential between Liang Ge balancing gate pits 1160,1162, with point Every the elastic deformation of part 1164, the other end of axle 1166 pushes the front end of inner tube 1144, and inner tube 1144 is pushed towards top dead-centre side.

Balancing gate pit 1160 in bottom dead centre side, between partition member 1164 and body 1128a, is configured with spring members 1168, spring members 1168 support lattice by acting on the force pushed to top dead-centre side relative to partition member 1164 Part 1164.

Moreover, connection pipe arrangement 1170 is linked to the balancing gate pit 1160 of bottom dead centre side.In addition, in cylinder 1110, being formed with from cylinder 1110 outer peripheral face extends through the through hole 1110c in scavenging port 1118.Connect pipe arrangement 1170 and through hole 1110c link, By connecting pipe arrangement 1170 and through hole 1110c, the inside (first position) of scavenging port 1118 is connected with balancing gate pit 1160.

On the other hand, pipe arrangement (not shown) is linked to the balancing gate pit 1162 of top dead-centre side, passes through the pipe arrangement, balancing gate pit 1162 The position separated compared with fuel injection orifice 1154 from scavenging port 1118, for example, active gas among scavenging reservoir 1120 The position (second place) that the stream of body is small is connected.Second place stream of active gases compared with first position is small, correspondingly, static pressure Pressure change it is small.

Figure 20 is the figure for showing fuel distribution tube 1126 and switching mechanism 1128 in Figure 19.As shown in figure 20, endoporus 1150 And exit orifice 1152 separates along stroke direction and is provided with multiple respectively, and the interval of stroke direction is equal.In addition, endoporus 1150 and outer Hole 1152 with through the vertical cross sectional shape in direction be same shape.

In fig. 20, the base end side (top dead-centre side) of inner tube 1144 is connected to positioning element 1172.So as to inner tube 1144 Do not moved relative to the relative position of outer tube 1146 compared with the position shown in Figure 20 to top dead-centre side.

In addition, the movement for going to bottom dead centre side of inner tube 1144 is restricted to the front until inner tube 1144 and opening/closing machine The position that the body 1128a of structure 1128 is abutted.Therefore, the movable distance of the stroke direction of inner tube 1144 is in fig. 20 with symbol Length shown in number M.

In fig. 20, be in inner tube 1144 relative to outer tube 1146 to bottom dead centre side relatively displacement M when, i.e. it is interior When pipe 1144 is moved to bottom dead centre side the most, endoporus 1150 and exit orifice 1152 are changed into the position relationship of the state fully overlapped.

Figure 21 A~C is the figure for illustrating the opening and closing of fuel injection orifice 1154.As illustrated in fig. 21, it is located in inner tube 1144 The most top dead-centre side when, endoporus 1150 and exit orifice 1152 are misaligned, the whole closure of fuel injection orifice 1154.

Then, if piston 1112 is moved from top dead-centre side towards bottom dead centre side, scavenging port 1118 starts opening, from scavenging end Mouth 1118 starts active gases in suction cylinder 1110, then the dynamic pressure in scavenging port 1118 rises, static pressure reduction.As a result, press The pressure of power room 1160 starts reduction, as illustrated in fig. 21b, and inner tube 1144 is moved to bottom dead centre side.Now, endoporus 1150 and exit orifice 1152 partly overlap, the part opening of fuel injection orifice 1154.

And then, if scavenging port 1118 is opened completely, from the active gases in the suction cylinder 1110 of scavenging port 1118 Flow velocity is further up, rises simultaneously with the dynamic pressure in scavenging port 1118, and static pressure reduction also becomes obvious, balancing gate pit 1160 Pressure is further reduced.As a result, as shown in fig. 21 c, inner tube 1144 is moved to bottom dead centre side the most, endoporus 1150 and exit orifice 1152 Fully overlap.That is, fuel injection orifice 1154 is fully open.

If piston 1112 is returned at bottom dead centre, and goes to top dead-centre side, then coordinate remaining silent for scavenging port 1118, from figure The state shown in state towards Figure 21 A shown in 21C, inner tube 1144 is moved to top dead-centre side.

Figure 22 A and B are the figures for illustrating the aperture of scavenging port 1118 and the relation of mixture strength.In Figure 22 A and B In, above-below direction represents the stroke direction of piston 1112, and upside is corresponding with the top dead-centre side of piston 1112, downside and piston 1112 Bottom dead centre side correspondence.

Scavenging port 1118 is as shown in Figure 22 A and B with the chart of port openings area, and aperture area passes through piston 1112 position and change.When starting opening in scavenging port 1118, among scavenging port 1118, from the upper dead of piston 1112 Point side starts opening, and bottom dead centre side is finally opened.Moreover, when starting to remain silent in scavenging port 1118, scavenging port 1118 it In, remained silent since the bottom dead centre side of piston 1112, top dead-centre side is finally closed.

As a result, that as shown in Figure 22 A and B with the chart of scavenging air amount of scavenging air amount (scavenging active gases amount) Sample, proportionally changes with port openings area.Now, in the comparative example shown in Figure 22 B, such as the chart institute of gas injection amount As showing, the emitted dose and port openings area of fuel gas are disproportionate.Therefore, as in Figure 22 B with mixture strength As chart is shown, the fuel gas and the concentration of the gaseous mixture of active gases flowed into from scavenging port 1118 partly becomes It is dense.

In addition, as described above, corresponding with scavenging air amount, the static pressure in scavenging port 1118 is reduced, thus such as Figure 22 A institutes Show, the inside (first position) of scavenging port 1118 and the pressure differential Δ P of scavenging reservoir 1120 (second place) become big.

Therefore, in the present embodiment, set corresponding with pressure differential Δ P, inner tube 1144 is automatically with respect to outer tube 1146 Make the switching mechanism 1128 of relative position displacement, accordingly, also make in Figure 22 A to spray with the aperture area of scavenging port 1118 The aperture area change of fuel injection orifice 1154 shown in the chart of open area.

Therefore, as in Figure 22 A as the chart of gas injection amount is shown, the emitted dose and active gases of fuel gas Amount increase and decrease generally proportionately, thus, it is possible to by the mixing of the fuel gas and active gases that are flowed into from scavenging port 1118 The concentration of gas remains substantially certain.

Although in the above-described embodiment, illustrating that switching mechanism 1128 becomes the pressure differential of first position and the second place For pushing force, to be opened and closed the situation of fuel injection orifice 1154, but switching mechanism 1128 for example obtains first position as electric signal With the pressure differential of the second place, and accordingly make fuel injection using actuator etc. with the pressure differential of first position and the second place The opening and closing of mouth 1154 also may be used.

In addition, though in the above-described embodiment, the situation that first position is located in scavenging port 1118 is illustrated, but the Then can also be scavenging port 1118 if a position produces the position of pressure change with the aperture of scavenging port 1118 Outside.But, by making first position in scavenging port 1118, the pressure change that the aperture of scavenging port 1118 is adjoint is higher Precision it is reflected in the opening and closing of fuel injection orifice 1154.

In addition, though in the above-described embodiment, it is from scavenging compared with fuel injection orifice 1154 to illustrate the second place The situation for the position that port 1118 is separated, if but the small position of second place pressure change compared with first position, then can be with It is optional position.But, if make the second place be such as scavenging reservoir 1120 compared with fuel injection orifice 1154 from scavenging The position that port 1118 is separated, then be difficult to be influenceed by the flowing of the active gases that is sucked by scavenging port 1118, can be by Pressure change be suppressed to it is smaller, to be appropriately performed the opening and closing of fuel injection orifice 1154.

In addition, in the above-described embodiment, illustrating to possess the dual pipe based on inner tube 1144 and outer tube 1146, endoporus 1150 and exit orifice 1152 overlap to form the situation of fuel injection orifice 1154.But, dual pipe is not essential composition, fuel spray Loophole 1154 can also be accordingly opened and closed with the pressure differential of first position and the second place by other switching mechanism.But It is that, by using the composition for setting the dual pipe based on inner tube 1144 and outer tube 1146, can be carried out by simple mechanism The opening and closing of fuel injection orifice 1154.

In addition, in the above-described embodiment, if illustrating scavenging reservoir 1120 (second place) and scavenging port 1118 The differential pressure of interior (first position) increases, then inner tube 11144 is pushed towards a side of stroke direction (bottom dead centre side), if differential pressure subtracts It is few, then the situation that inner tube 1144 is pushed by the other end (top dead-centre side) towards stroke direction.However, it is also possible in contrast, if The differential pressure increase of (first position) in scavenging reservoir 1120 (second place) and scavenging port 1118, then inner tube 1144 is by towards punching Cheng Fangxiang top dead-centre side is pushed, if differential pressure is reduced, and inner tube 1144 is pushed towards the bottom dead centre side of stroke direction.

But, if inner tube 1144 is by the composition of the direction pushing along above-mentioned embodiment, then exit orifice 1152 and endoporus 1150 part for starting to overlap is the top dead-centre side among an exit orifice 1152.Due to starting out among scavenging port 1118 The part of mouth is also top dead-centre side, therefore the near side of the active gases for the scavenging port 118 that can be open since away from flowing into be opened The injection of beginning fuel gas, the deep or light suppression of part to fuel gas has effect.

Utilization possibility in industry

The disclosure can be used in active gases together following fuel gas from the uniflow type in the suction cylinder of scavenging port is double Ring engine.

Symbol description

Ob big flows open area

Os low discharges open area

100 uniflow type two-cycle engines

110 cylinders

112 pistons

118 scavenging ports

126 fuel injection portions

154 drive divisions

156th, 756 inner tube

158th, 758 outer tube

174th, 274,374,474 endoporus

176th, 276,376,476 exit orifice

526th, 626,726 fuel injection portion

770 spring members (force body)

Claims (9)

1. a kind of uniflow type two-cycle engine, possesses：

Cylinder, it internally forms combuster；

Piston, it is slided in the cylinder；

Scavenging port a, side of the stroke direction of its described piston in the cylinder is set, and the slip with the piston is moved Active gases is accordingly sucked the combustion chamber by work；And

Fuel injection portion, it is located on the outside of the radial direction of the cylinder compared with the scavenging port, and to by the scavenging end The active gases spray fuel gas of mouth suction,

The fuel injection portion possesses：

Inner tube, it has inleakage and outside endoporus, and fuel gas is directed into the inside；

Outer tube, it has inleakage and outside exit orifice, the inner containment said inner tube with the similar shape of said inner tube one Into dual pipe；And

Drive division, it changes said inner tube and the relative position of the outer tube, so that amount of opening changes, the amount of opening is institute State the endoporus area overlapping with the exit orifice.

2. uniflow type two-cycle engine according to claim 1, the endoporus and the exit orifice be overlapping and shape Into open area in, the low discharge open area comprising the side for being located opposite from the stroke direction and with it is described Compare the big flow open area of the another side positioned at the stroke direction in low discharge open area.

3. uniflow type two-cycle engine according to claim 2, the endoporus and the exit orifice are respectively along described Stroke direction separates and is provided with multiple, forms the endoporus and the exit orifice of the big flow open area and is formed described small The endoporus and the exit orifice of flow open area are separated along the stroke direction respectively.

4. the uniflow type two-cycle engine according to Claims 2 or 3, with the big flow open area with it is described The mode that low discharge open area is in a ratio of the endoporus state overlapping for a long time with the exit orifice is constituted.

5. the uniflow type two-cycle engine according to any one of claim 2 to 4, with the big flow opening The region relatively early overlapping mode of the endoporus and the exit orifice compared with the low discharge open area is constituted.

6. the uniflow type two-cycle engine according to any one of claim 2 to 5, with the big flow opening Region overlapping mode released later of the endoporus and the exit orifice compared with the low discharge open area is constituted.

7. the uniflow type two-cycle engine according to any one of claim 2 to 6, the big flow open region The amount of opening in domain is bigger than the amount of opening of the low discharge open area.

8. the uniflow type two-cycle engine according to any one of claim 1 to 7, the drive division makes described Inner tube or the outer tube are moved along the stroke direction.

9. the uniflow type two-cycle engine according to any one of claim 1 to 8,

The drive division has the force body that the change direction with the relative position is abreast exerted a force to said inner tube,

If said inner tube is by being directed into the pressure of the fuel gas of said inner tube by edge and the force pair of the force body Anti- direction is pushed, then by the pressure change of the fuel gas, the relative position change of said inner tube and the outer tube.