CN105020000A - Two-stroke engine - Google Patents
Two-stroke engine Download PDFInfo
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- CN105020000A CN105020000A CN201410161780.8A CN201410161780A CN105020000A CN 105020000 A CN105020000 A CN 105020000A CN 201410161780 A CN201410161780 A CN 201410161780A CN 105020000 A CN105020000 A CN 105020000A
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- scavenging
- port
- scavenging port
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- stroke engine
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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Abstract
The invention relates to a two-stroke engine. An air inlet (11) and an air outlet are oppositely arranged on the wall face of a cylinder bore (2A) formed on an air cylinder (2); the two-stroke engine comprises a pair of scavenging ports (13), a scavenging window (24) and a scavenging cover (26), wherein the scavenging ports (13) are arranged between the air inlet (11) and the air outlet, and the axes separated by the cylinder bore (2A) are approximately opposite; the scavenging window (24) is communicated with the scavenging ports (13), and openings are arranged on the scavenging window (24) at the positions of the outer side of the air cylinder (2); and the scavenging window (24) is plugged through the outer side of the air cylinder (2). Extending parts (13D) are arranged on the scavenging ports (13) respectively and are arranged on the side of the air inlet (11) in an extending manner, and the extending parts (13D) and the end of the air inlet (11) are overlapped when a person performs observation in the direction of the axis of the cylinder bore (2A).
Description
Technical field
The present invention relates to a kind of two stroke engine (2-stroke engine), particularly relating to a kind of sparetime (hobby) being equipped on wireless operating model etc. uses two stroke engine.
Background technique
In the past, in two stroke engine, the movement of the mixed gas in crank chamber along with the lower dead center side to piston is flowed into from suction port, flow being formed in the scavenge air belt in cylinder wall, be fed into (such as with reference to patent documentation 1: Japanese Patent Laid-Open 2010-084623 publication) in cylinder thorax (cylinder bore) from the scavenging port be communicated with scavenge air belt.Now, the scavenging that the waste gas in cylinder thorax is extruded by the mixed gas of inflow is carried out.If make the amount of the mixed gas flowing into cylinder thorax in once circulating increase, then explosive power can be made to rise and obtain high output.
Requiring in the high sparetime two stroke engine exported, as maintain the method expanding scavenging port under on the engine characteristics larger opening and closing sequential of scavenging port of impact or the state in scavenging direction, undertaken expanding scavenging port to air inlet side by the user buying two stroke engine and the additional work (following, this additional work to be called " the prolongation processing of scavenging port ") that makes it extend in the circumferential.Expand scavenging port to air inlet side but not the reason of exhaust side is to suppress so-called gas leakage.In two stroke engine, exist because of when steps of exhausting and scavenging step time unburned mixed gas leak to relief opening and cause the problem of low output, therefore want by scavenging port being configured in by suction port place, make scavenging port away from relief opening, suppress the gas leakage of mixed gas with this and obtain high output.Scavenging port prolongation processing in, cylinder thorax axial direction observe time, make scavenging port extend to overlapping with suction port till.
If realize scavenging port in advance when the volume production of cylinder to extend to the structure overlapping with suction port, so just without the need to being carried out the prolongation processing of scavenging port by additional work, and commercially available state ground can be kept to play high output.But, in two stroke engine in the past, scavenge air belt utilizes the mould (press tool) taken out to lower dead center layback and is shaped, and therefore cannot realize the scavenging port when the axial direction of cylinder thorax is observed and extend to overlapping with suction port on die forming.Therefore, there is the prolongation processing needing described scavenging port, and make processing expend the problem in man-hour.
Summary of the invention
A kind of height that plays is the object of the present invention is to provide to export and the two stroke engine that mass production can be tackled.
The feature of two stroke engine of the present invention is: be formed at cylinder cylinder thorax wall subtend suction port and relief opening are set, and comprise: a pair scavenging port, be separately positioned between described suction port and described relief opening, and across the axis roughly subtend of described cylinder thorax; Scavenging window, is communicated with described scavenging port, and in the outer openings of described cylinder; And scavenging cover, from scavenging window described in the outside shutoff of described cylinder; And scavenging port arranges extended portion respectively described in each, this extended portion is extended to described air inlet side, and overlapping with the end of described suction port when the axial direction of described cylinder thorax is observed.
According to the present invention, extended to air inlet side and the extended portion overlapping with the end of suction port when the axial direction of cylinder thorax is observed owing to arranging at scavenging port, therefore can make the enlarged areas extended portion area occupied of scavenging port.Thus, can burn more mixed gas in a circulation, thus two stroke engine can be made to play high output.
In addition, cylinder possesses and to be communicated with scavenging port and the scavenging window of outer openings at cylinder, therefore when making cylinder, can from scavenging reveal but not cylinder thorax layback takes out press tool, thus formed the scavenging port of extended portion is set.Thus, extended portion can be pre-formed when making cylinder, thus namely can extend processing without the need to the additional work carrying out being undertaken by user in the past.
As mentioned above, according to two stroke engine of the present invention, high output can be played, and can mass production be tackled.
In two stroke engine of the present invention, preferred described scavenging port, in the circumference of described cylinder thorax, is positioned at the position by described suction port.
According to the present invention, because scavenging port is positioned at the position by suction port in the circumference of cylinder thorax, scavenging port therefore can be made away from relief opening.Thus, can suppress when mixed gas flows in cylinder thorax from scavenging port, unburned mixed gas leaks (gas leakage) to relief opening, thus can make more mixture combustion, and two stroke engine therefore can be made more positively to play high output.
In two stroke engine of the present invention, the length of the circumference of preferred described extended portion add up to 5% ~ 26% of the length of the circumference of suction port.
According to the experiment undertaken by inventor, confirm when the circumference of extended portion length add up to 5% ~ 26% of the length of the circumference of suction port time, the output of two stroke engine is higher.According to the present invention, because scavenging port is that the mode making the total of the length of the circumference of extended portion become in described scope is formed, two stroke engine therefore can be made to play high output.
And then as mentioned above, two stroke engine of the present invention possesses the formation can tackling mass production, therefore can utilize automated machine tool, form scavenging port exactly in the position meeting the described condition confirmed by inventor.Thus, the individual difference of the two stroke engine easily produced in the prolongation processing undertaken by user can positively be eliminated.
In two stroke engine of the present invention, preferred described scavenging port comprise setting in the circumferential away from the position of described suction port the first scavenging port, arrange in the circumferential close to the position of described suction port the second scavenging port and separate the divider of described first scavenging port and described second scavenging port.
According to the present invention, owing to arranging divider in the middle of scavenging port, this scavenging port is split in the circumferential, even if therefore when the length of the circumference of scavenging port is longer, also make divider become buildup piece and prevent the distortion of the scavenging port caused because of ignition heat etc.Thus, two stroke engine can be made to play consistently high output.
In addition, because scavenging port is separated into the first scavenging port and the second scavenging port, therefore the blowout angle of mixed gas to cylinder thorax can be set separately at the first scavenging port and the second scavenging port.
In two stroke engine of the present invention, preferably in the face towards described scavenging port of described scavenging cover, projecting the rectification part flow direction of the mixed gas towards described scavenging port being adjusted to prescribed direction.
According to the present invention, due to rectification part projecting in the face towards scavenging port of scavenging cover, after therefore the flow direction of mixed gas can being adjusted to prescribed direction, make it towards scavenging port 13.In addition, when the trial-production of two stroke engine 1 or when improveing, when finding the flow direction as the high mixed gas exported can be played, as long as change the rectification part of the scavenging cover from cylinder being different part, thus the high output of two stroke engine can be realized with less cost and shorter time.
Accompanying drawing explanation
Fig. 1 is the stereogram of the two stroke engine of embodiments of the present invention.
Fig. 2 is the plan view of two stroke engine.
Fig. 3 is the side view of the cylinder observed from the arrow III direction of Fig. 2.
Fig. 4 is the sectional view of the IV-IV line along Fig. 2.
Fig. 5 is the sectional view of the V-V line along Fig. 2.
Fig. 6 is the sectional view of the VI-VI line along Fig. 2.
Embodiment
Below, with reference to Fig. 1 ~ Fig. 6, while be described the two stroke engine 1 of one embodiment of the present invention.Two stroke engine 1 is piston valve (piston valve) formula motor.
In the following description, by two stroke engine 1 referred to as " motor 1 ".In addition, for the ease of understanding, mutually orthogonal three directions are defined as " X-direction " " Y-direction " " Z-direction " respectively, suitably reference, while be described." X-direction " is the left and right directions of motor 1, arrow side is set to right side." Y-direction " is the fore-and-aft direction of motor 1, arrow side is set to rear side." Z-direction " is the above-below direction of motor 1, arrow side is set to upside.
Motor 1 comprises cylinder 2, is installed with crank box 3 in the downside of cylinder 2.Cylinder 2 has the cylinder thorax 2A for roughly cylindrical space, and not shown piston reciprocates along the vertical direction in cylinder thorax 2A.Crank box 3 is configured to split in left-right direction, and not shown crankshaft is inserted on segmentation direction.Piston is linked to via connecting rod (not shown) crank (not shown) rotated integratedly with crankshaft, the back and forth movement of the above-below direction of piston is converted to the rotation of crankshaft.
Below, the detailed formation of cylinder 2 is described.
Cylinder 2 is made up of the casting piece of aluminum alloy.In the cylinder thorax 2A of cylinder 2, respectively suction port 11 is set at the wall of front side, relief opening 12 is set at the wall of rear side, at the wall of the left and right sides, axis across cylinder thorax 2A is set and a pair scavenging port 13,13 of roughly subtend.Scavenging port 13,13 is that face is arranged symmetrically with respect to the YZ plane at the center of cylinder thorax 2A.At the top of cylinder thorax 2A, form the jack 2B for installing spark plug (not shown).
As shown in Figure 4, scavenging port 13 has divider 13C in the approximate centre of circumference, utilizes divider 13C and is separated into the first scavenging port 13A of relief opening 12 side and the second scavenging port 13B of suction port 11 side.Scavenging port 13 is positioned at the position by suction port 11 in the circumference of cylinder thorax 2A.
The opening and closing along with the movement of the above-below direction of piston respectively of suction port 11, relief opening 12 and scavenging port 13.In addition, be arranged on respectively can with the height of sequential opening and closing of regulation for suction port 11, relief opening 12 and scavenging port 13.
In addition, as shown in Figure 4, Figure 5, at each second scavenging port 13B, arrange extended portion 13D respectively, this extended portion 13D is extended to suction port 11 side, and from direction observe time across and length L1 and overlapping with the end of suction port 11.Therefore, when the XZ comprising central axis (some chain lines of Fig. 5) overlooks, the minor face 13E of the vertical of suction port 11 side in the second scavenging port 13B is positioned at the position more leaning on the central axis of cylinder thorax 2A than the minor face 11A of the vertical of suction port 11.
5% ~ 26% of the length L2 that the total (=L1+L1) of the length L1 of the circumference of preferred extended portion 13D is the circumference of suction port 11.According to the experiment undertaken by inventor, confirm that the output of motor 1 is higher when suction port 11 and second scavenging port 13B, 13B overlapping is positioned at described scope.In the motor 1 of present embodiment, form scavenging port 13,13 in the mode meeting this condition.
In addition, in cylinder 2, arrange through in the longitudinal direction and be communicated in the inlet air pathway 21 (with reference to Fig. 4, Fig. 5) of suction port 11, through in the longitudinal direction and the exhaust passageway 22 (with reference to Fig. 4, Fig. 6) that is communicated in relief opening 12 and a pair scavenge air belt 23,23 (with reference to Fig. 4 ~ Fig. 6) extended in the vertical direction.In the casting step of cylinder 2, suction port 11 and inlet air pathway 21 are the press tool that utilizes layback forward to take out and are shaped, relief opening 12 and exhaust passageway 22 are the press tool that utilizes layback backward to take out and are shaped, and scavenge air belt 23,23 is the press tool that utilizes downward layback to take out and is shaped.Inlet air pathway 21 is linked to and is mixed with air by fuel and produce the vaporizer (not shown) of mixed gas.Exhaust passageway 22 is connected to the baffler (not shown) eliminating exhaust sound.
Scavenge air belt 23 is communicated in the first scavenging port 13A and the second scavenging port 13B in upper end portion via following scavenging window 24, is communicated in the crank chamber (not shown) be formed in crank box 3 in underpart.As shown in Figure 4, when side-looking, the wall 23A of the rear side of scavenge air belt 23 is positioned on the elongation line of vertical minor face 13F of the rear side of the first scavenging port 13A.In addition, the wall 23B of the front side of scavenge air belt 23 is configured at the vertical minor face 13E more rear side than the front side of the second scavenging port 13B.So, scavenge air belt 23 circumference be shorter in length than scavenging port 13, scavenging port 13 relative to scavenge air belt 23 to front side (suction port 11 side) skew and arrange.
In addition, in the left and right sides of cylinder 2, form scavenging window 24 in the position corresponding with each scavenging port 13.Scavenging window 24 is formed as the rectangle of encirclement first scavenging port 13A and the second scavenging port 13B, opening toward the outer side.Scavenging window 24 is communicated in the first scavenging port 13A and the second scavenging port 13B in the cylinder thorax 2A side of its inboard.
In the casting step of cylinder 2, scavenging window 24 utilizes the press tool of drawing in left-right direction and taking out and is formed together with the first scavenging port 13A and the second scavenging port 13B.Near scavenging window 24, form two screws 25,25 with the end, use this screw 25,25 and utilize two screws 27,27 to fix the scavenging cover 26 of shutoff scavenging window 24.
In the face towards scavenging port 13 of scavenging cover 26, projecting rectification part 26A.Rectification part 26A makes it towards the first scavenging port 13A and the second scavenging port 13B after the flow direction of the mixed gas supplied from scavenge air belt 23 being adjusted to suitable direction, and the mode that must be less than the amount of the mixed gas of inflow first scavenging port 13A with the quantitative change of the mixed gas making inflow second scavenging port 13B limits.Utilize the flow direction of rectification part 26A and adjusted mixed gas to be also imparted to flow into from the first scavenging port 13A and the second scavenging port 13B the mixed gas in cylinder thorax 2A.
According to the above motor 1 formed, when the piston being positioned at lower dead center moves towards top dead center upward direction, negative pressure is become in crank chamber, and at the time point of piston arrives near top dead center, opened by the suction port 11 of skirt section (skirt) shutoff of piston, the mixed gas supplied from inlet air pathway 21 flows into crank chamber from suction port 11.Meanwhile, in cylinder thorax 2A, the mixed gas being positioned at the upside (top dead center side) of piston is compressed along with the rising of piston.When piston transfers decline by top dead center to from rising, utilize the mixed gas of spark plug to compression to light a fire, the mixed gas of burning expands and is pushed downwards by piston.Along with the decline of piston, first by relief opening 12 opening of piston shutoff, the mixed gas of burning is become waste gas and is discharged by exhaust passageway 22.When piston declines further, the first scavenging port 13A and the second scavenging port 13B opening, roughly meanwhile, in the lower end side of piston, suction port 11 opening.So the mixed gas in crank chamber utilizes piston moving and being extruded downwards, flows in cylinder thorax 2A, the scavenging carried out in cylinder thorax 2A along with this inflow by scavenge air belt 23 from the first scavenging port 13A and the second scavenging port 13B.Then, piston from lower dead center towards top dead center again upward direction move.By repeating this succession of circulation, drive motor 1 constantly.
[effect of mode of execution]
According to the above motor 1 formed, due to the second scavenging port 13B in suction port 11 side, arrange extended to suction port 11 side and from during top view across and length L1 and the extended portion 13D overlapping with the end of suction port 11, the area of scavenging port 13 therefore can be made to have more and to be equivalent to extended portion 13D area occupied.Thus, can burn more mixed gas in a circulation, thus two stroke engine 1 can be made to play high output.
In addition, scavenging port 13 is communicated in and the scavenging window 24 of outer openings at cylinder 2 because cylinder 2 possesses, therefore when making cylinder 2, from scavenging window 24 side but not cylinder thorax 2A layback takes out press tool, thus the second scavenging port 13B that extended portion 13D is set can be formed.Thus, extended portion 13D can be pre-formed when making cylinder 2, and namely extend processing without the need to the additional work carrying out being undertaken by user in the past.
As mentioned above, according to motor 1 of the present invention, high output and reply mass production can be played.
Because scavenging port 13 is positioned at the position by suction port 11 in the circumference of cylinder thorax 2A, scavenging port 13 therefore can be made away from relief opening 12.Thus, when mixed gas flows in cylinder thorax 2A from scavenging port 13, unburned mixed gas can be suppressed to leak (gas leakage) to relief opening 12, thus more mixture combustion can be made, motor 1 therefore can be made more positively to play high output.
To meet the mode that the total (=L1+L1) making motor 1 play the length L1 of the circumference of the high condition, i.e. the extended portion 13D that export confirmed by inventor becomes the condition of 5% ~ 26% of the length L2 of the circumference of suction port 11, be formed with scavenging port 13, two stroke engine therefore can be made to play high output.
And then as mentioned above, motor 1 possesses the formation can tackling mass production, therefore can utilize automated machine tool, form scavenging port 13 exactly in the position meeting the described condition confirmed by inventor.Thus, the individual difference of the motor 1 easily produced in the prolongation processing undertaken by user can positively be eliminated.
Owing to arranging divider 13C in the middle of scavenging port 13, this scavenging port 13 is split in the circumferential, even if therefore when the length of the circumference of scavenging port 13 is longer, divider 13C is also made to become buildup piece and prevent the scavenging port 13 caused because of ignition heat etc. to be out of shape.Thus, motor 1 can be made to play consistently high output.
In addition, because scavenging port 13 is separated into the first scavenging port 13A and the second scavenging port 13B, therefore the blowout angle of mixed gas to cylinder thorax 2A can be set respectively at the first scavenging port 13A and the second scavenging port 13B.
Due to rectification part 26A projecting in the face towards scavenging port 13 of scavenging cover 26, after therefore the flow direction of mixed gas can being adjusted to suitable direction, make it towards scavenging port 13.
In addition, when the trial-production of motor 1 or when improveing, when finding the flow direction as the high mixed gas exported can be played, as long as change is the rectification part 26A of the scavenging cover 26 of different part from cylinder 2.And then, as long as dismounting scavenging cover 26, just can process cylinder 2 outside circumferencial direction, and easily can change the air inlet sequential (porttiming) of cylinder 2.By these, the high output of motor 1 can be realized with less cost and shorter time.
[change case]
The present invention is not limited to described mode of execution, and distortion, improvement etc. in the scope of the object of attainable cost invention are contained in the present invention.
Such as, in embodiments, divider 13C is set at scavenging port 13, but also can omits divider 13C.In this case, the rectification part 26A of scavenging cover 26 is preferably made to be projected near the inner peripheral surface of cylinder thorax 2A.
In addition, the example of mode of execution to be motor 1 be piston valve type, but motor 1 also can be leaf valve (reedvalve) formula or rotary valve (rotary valve) formula.In addition, the example of mode of execution to be motor 1 be single cylinder, but motor 1 also can be multi cylinder.
Claims (5)
1. a two stroke engine, is characterized in that: roughly arrange suction port and relief opening to subtend at the wall of the cylinder thorax being formed at cylinder, and comprise:
A pair scavenging port, is separately positioned between described suction port and described relief opening, and across the axis roughly subtend of described cylinder thorax;
Scavenging window, is communicated with described scavenging port, and in the outer openings of described cylinder; And
Scavenging cover, from scavenging window described in the outside shutoff of described cylinder;
Described in each, scavenging port arranges extended portion respectively, and this extended portion is extended to described air inlet side, and overlapping with the end of described suction port when the axial direction of described cylinder thorax is observed.
2. two stroke engine according to claim 1, is characterized in that:
Described scavenging port, in the circumference of described cylinder thorax, is positioned at the position by described suction port.
3. two stroke engine according to claim 1, is characterized in that:
The length of the circumference of described extended portion add up to 5% ~ 26% of the length of the circumference of described suction port.
4. two stroke engine according to claim 1, is characterized in that:
Described scavenging port comprise setting in the circumferential away from the position of described suction port the first scavenging port, arrange in the circumferential close to the position of described suction port the second scavenging port and separate the divider of described first scavenging port and described second scavenging port.
5. two stroke engine according to any one of claim 1 to 4, is characterized in that:
In the face towards described scavenging port of described scavenging cover, projecting the rectification part flow direction of the mixed gas towards described scavenging port being adjusted to prescribed direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410161780.8A CN105020000B (en) | 2014-04-22 | 2014-04-22 | Two stroke engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410161780.8A CN105020000B (en) | 2014-04-22 | 2014-04-22 | Two stroke engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105020000A true CN105020000A (en) | 2015-11-04 |
| CN105020000B CN105020000B (en) | 2018-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410161780.8A Active CN105020000B (en) | 2014-04-22 | 2014-04-22 | Two stroke engine |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1069294A2 (en) * | 1999-07-15 | 2001-01-17 | Maruyama MFG. Co., Inc. | Two-stroke cycle engine |
| CN101839167A (en) * | 2009-03-17 | 2010-09-22 | 日立工机株式会社 | Two stroke engine and the power tool that is equipped with two stroke engine |
| JP2010216314A (en) * | 2009-03-13 | 2010-09-30 | Hitachi Koki Co Ltd | Two-stroke engine and engine tool |
| CN102345503A (en) * | 2010-08-02 | 2012-02-08 | 株式会社山彦 | Loop scavenged two-stroke internal combustion engine |
| US20120145137A1 (en) * | 2010-12-13 | 2012-06-14 | Yamabiko Corporation | Two-cycle engine |
| CN102782280A (en) * | 2010-03-31 | 2012-11-14 | 日立工机株式会社 | Two-cycle engine and engine tool comprising the same |
| US8353262B2 (en) * | 2009-07-24 | 2013-01-15 | Yamabiko Corporation | Two-stroke internal combustion engine |
| CN102926883A (en) * | 2011-08-10 | 2013-02-13 | 株式会社山彦 | Two-stroke internal combustion engine |
| CN103339355A (en) * | 2011-02-03 | 2013-10-02 | 富世华智诺株式会社 | Stratified scavenging two-stroke engine |
-
2014
- 2014-04-22 CN CN201410161780.8A patent/CN105020000B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1069294A2 (en) * | 1999-07-15 | 2001-01-17 | Maruyama MFG. Co., Inc. | Two-stroke cycle engine |
| JP2010216314A (en) * | 2009-03-13 | 2010-09-30 | Hitachi Koki Co Ltd | Two-stroke engine and engine tool |
| CN101839167A (en) * | 2009-03-17 | 2010-09-22 | 日立工机株式会社 | Two stroke engine and the power tool that is equipped with two stroke engine |
| US8353262B2 (en) * | 2009-07-24 | 2013-01-15 | Yamabiko Corporation | Two-stroke internal combustion engine |
| CN102782280A (en) * | 2010-03-31 | 2012-11-14 | 日立工机株式会社 | Two-cycle engine and engine tool comprising the same |
| CN102345503A (en) * | 2010-08-02 | 2012-02-08 | 株式会社山彦 | Loop scavenged two-stroke internal combustion engine |
| US20120145137A1 (en) * | 2010-12-13 | 2012-06-14 | Yamabiko Corporation | Two-cycle engine |
| CN103339355A (en) * | 2011-02-03 | 2013-10-02 | 富世华智诺株式会社 | Stratified scavenging two-stroke engine |
| CN102926883A (en) * | 2011-08-10 | 2013-02-13 | 株式会社山彦 | Two-stroke internal combustion engine |
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| CN105020000B (en) | 2018-02-09 |
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