CN201568131U

CN201568131U - Two-stroke engine

Info

Publication number: CN201568131U
Application number: CN2009202510183U
Authority: CN
Inventors: 杜涛
Original assignee: ZHONGJIAN TOOL MANUFACTURE CO Ltd YONGKANG CITY; TIANJIN INTERNAL-COMBUSTION ENGINE INST
Current assignee: Zhejiang Zhongjian Technology Co., Ltd.
Priority date: 2009-11-27
Filing date: 2009-11-27
Publication date: 2010-09-01
Anticipated expiration: 2019-11-27

Abstract

The utility model discloses a two-stroke engine, wherein, at least two scavenging channels communicated with a combustion chamber and a crankcase are arranged on a cylinder, at least one piston inner channel is arranged on a piston, and the piston inner channel is communicated with an engine air channel and the channels between the combustion chamber and the crankcase respectively. At the same time, the utility model further discloses another two-stroke engine, wherein, an air inlet and an air outlet opposite to each other are formed on the wall of a cylinder, at least two scavenging channels communicated with the combustion chamber and the crankcase are arranged on the cylinder, the two scavenging channels are a first scavenging channel positioned on one side of the air inlet of the cylinder and a second scavenging channel positioned on one side of the air outlet of the cylinder, the second scavenging channel is communicated with a channel having access to air, and an air throttle is arranged inside the channel. The two-stroke engine can enable the use of pure air by the scavenging channel at a greater distance from the air inlet in scavenging, followed by the use of mixed gas in scavenging, thereby better achieving the purpose of reducing the emissions of the two-stroke engine.

Description

Two stroke engine

Technical field

The utility model relates to a kind of two stroke engine, especially relate to a kind of can the realization and carry out scavenging with pure air earlier apart from suction port scavenging air belt far away, and then carry out scavenging with mixed gas, better to reach the two stroke engine that reduces the two stroke engine discharging.

Background technique

At present, the improved main common control device of two-stroke gasoline engine discharging has control devices such as catalytic converter, scavenging air belt structural dimension optimization, the chamber structure in baffler or the outlet pipe is dimensionally-optimised, firing time, ignition energy optimization, employing layered scavenging, reaches the purpose that as far as possible reduces discharge of harmful gases by the escape amount that reduces empty G﹠O vapour mixed gas.

Except the technological means of above-mentioned several control two stroke engine exhaust emissions commonly used, the technological scheme of attempting further to study and realize reducing from the angle of improving the engine piston structure exhaust index is arranged also in the present technique field.U.S. Pat 7322322 B2 disclose a kind of structure of two stroke engine, it mainly is by the passage of an opening is set on piston wall, air is sent to that scavenging air belt nearer apart from suction port from the air inlet of air inlet side, make this scavenging air belt when scavenging, realize carrying out scavenging with pure air earlier, and then carrying out scavenging with mixed gas, the scavenging air belt far away apart from suction port uses mixed gas to carry out scavenging always, thereby can effectively reduce the discharging of two stroke engine.

The model utility content

At prior art, the purpose of this utility model also is by a kind of two stroke engine is provided, this motor can realize that the scavenging air belt far away apart from suction port carries out scavenging with pure air earlier, and then carries out scavenging with mixed gas, better to reach the purpose that reduces the two stroke engine discharging.

In order to solve the problems of the technologies described above, first technological scheme that a kind of two stroke engine of the utility model is achieved is, this two stroke engine comprises cylinder, firing chamber, piston and crankcase, is provided with two scavenge trunks that are communicated with firing chamber and crankcase on the cylinder at least; At least be provided with an internal piston passage on the described piston, described internal piston passage is communicated with the scavenge trunk between engine air passage and firing chamber and the crankcase respectively.

In above-mentioned first technological scheme, described scavenge trunk is four, comprise two first scavenge trunk and two second scavenge trunks that are positioned at cylinder block gas port one side that are positioned at suction port one side that cylinder is communicated with crankcase, the air inlet of described engine air passage isolates two air inlets on the inwall of described cylinder; Described internal piston passage is two, and described each internal piston channel connection is positioned at the air inlet and second scavenge trunk of the same side on the cylinder wall.

Second technological scheme that a kind of two stroke engine of the utility model is achieved is, this comprises two stroke engine cylinder, firing chamber, piston and crankcase, described cylinder wall is provided with relative suction port and relief opening, at least be provided with two scavenge trunks that are communicated with firing chamber and crankcase on the cylinder, comprising first scavenge trunk that is positioned at cylinder suction port one side and second scavenge trunk that is positioned at cylinder block gas port one side, described second scavenge trunk is communicated with the passage of an access air, is provided with air throttle in the described passage.

In above-mentioned second technological scheme, described scavenge trunk is four, comprises two first scavenge trunk and two second scavenge trunks that are positioned at cylinder block gas port one side that are positioned at cylinder suction port one side.

Compared with prior art, the beneficial effect of a kind of two stroke engine of the utility model is:

Structure by changing the prior art engine piston or different passages is set on the engine cylinder wall, to realize that the scavenging air belt far away apart from suction port carries out scavenging with pure air earlier, and then carry out scavenging with mixed gas, better to reach the purpose that reduces the two stroke engine discharging.Wherein, changing structure of piston is that piston is provided with at least one enclosed passage, described enclosed passage one end opening is communicated with the air inlet of cylinder, its the other end opening is communicated with the scavenging port nearer apart from the cylinder block gas port, utilizes described enclosed passage can make the air passageways in the piston walk around the scavenge trunk of always using the mixed gas scavenging.The different passage of design on the engine cylinder wall, promptly wherein scavenge trunk outer wall is opened a passage air is incorporated into the scavenge trunk on cylinder, under the condition of setting, open or close this passage by air throttle, realize the pilot air scavenging with assurance, and then import fuel oil and the scavenging of Air mixing gas by another scavenge trunk.In above-mentioned different technologies scheme, the time that the air scavenging passage can be begun scavenging is arranged to more Zao, late or identical than mixed gas scavenge trunk.

Description of drawings

Fig. 1 is that piston is positioned at the structural representation of dotted state down in the utility model first technological scheme;

Fig. 2 is the structure sectional view of cylinder shown in Fig. 1;

Fig. 3 is the vertical profile structural representation that piston shown in Fig. 1 is positioned at the special position two stroke engine;

Fig. 4 is the cross-sectional structural representation of the two stroke engine of position shown in Fig. 3;

Fig. 5-the 1st, the schematic representation of piston structure shown in Fig. 1;

Fig. 5-the 1st, the cross-sectional structural representation of piston shown in Fig. 5-2;

Fig. 6 is that piston is positioned at the structural representation of dotted state down in the utility model two stroke engine second technological scheme;

Fig. 7 is the cross-sectional structural representation of the two stroke engine of position shown in Fig. 6.

Embodiment

The flesh and blood of the utility model two stroke engine is: how to realize that the scavenging air belt far away apart from suction port carries out scavenging with pure air earlier, and then carry out scavenging with mixed gas, reduce the two stroke engine discharging better to reach.Based on this purpose, the utility model two stroke engine has the different technological scheme of two covers, below in conjunction with the drawings and specific embodiments the utility model is done to describe in further detail.

The utility model main parts size and specification specified: 1. cylinder, 2. firing chamber, 3. piston, 4. first opening, 5. second opening, 6. scavenge trunk, 7. air scoop, 8. scavenge trunk, 9,10. suction port, 11. connecting rod, 12. crankcases, 13. relief openings, 14. bent axle, 15. the internal piston passage, 16. passages, 17. air throttles.

As shown in figures 1 and 3, the utility model two stroke engine comprises cylinder 1, firing chamber 2, piston 3 and crankcase 12, is provided with two scavenge trunks that are communicated with firing chamber 2 and crankcase 12 on the described cylinder 1 at least; Shown in Fig. 5-1 and Fig. 5-2, be provided with an internal piston passage 15 on the described piston 3 at least, described internal piston passage 15 is communicated with the passage between engine air passage and firing chamber 2 and the crankcase 12 respectively.This structure can make the HC of two stroke engine and the brake specific emission of NOx be reduced significantly, this structure can be used a kind of piston 3, and has a passage that can be communicated with air passageways by internal piston passage 15 and be communicated with firing chamber 2 and crankcase 12 on the piston 3 at least, piston 3 can be sent to the air that the air inlet 9 of cylinder 1 cylinder is come in second scavenge trunk 6 nearer apart from relief opening 13, making this scavenging air belt 6 realize carrying out scavenging with air earlier, is that mixed gas carries out scavenging then.Structurally, can be arranged to four described scavenge trunks that are symmetrically distributed in twos, as shown in Figure 2, use at least two scavenge trunks 8 side by side, 6 cylinder 1, a relief opening 13 is set on the cylinder 1, relief opening 13 relative sides are provided with a suction port 10 of fuel oil and air Mixture being introduced crankshaft room 12, one side of the suction port 10 of cylinder 1 is provided with at least one air inlet 9, as shown in Figure 3, piston 3 is in the certain location interval, as shown in Figure 4, the air inlet passage can be by piston 3 inner passage 15 couple together with second scavenge trunk 6 nearer apart from relief opening 13, thereby making this second scavenge trunk 6 realize at first using the scavenging of pilot air elder generation, is that fuel oil and Air mixing gas carry out scavenging then.Use fuel oil and air Mixture to carry out scavenging apart from relief opening 13 first scavenge trunks far away always, the time that this first scavenge trunk begins scavenging can be arranged to the same with the time of second scavenge trunk, the 6 beginning scavengings that realize the pilot air scavenging, and it is different also can being arranged to.And in whole stroke range of piston 3, the window that piston 3 is communicated with second scavenge trunk 6 can not get around second scavenge trunk 6 and be communicated with crankshaft room 12, can guarantee to store in this second scavenge trunk 6 purer air.

Also can be arranged to as shown in Figure 6 on the utility model two stroke engine structure, engine cylinder 1 wall is provided with a suction port 10 of fuel oil and air Mixture being introduced crankshaft room 12, on the cylinder wall with on these suction port 10 relative positions a relief opening 13 is set, at least be provided with two scavenge trunks that are communicated with firing chamber 2 and crankcase 12 on the cylinder, comprising first scavenge trunk 8 and second scavenge trunk 6 that is positioned at cylinder block gas port 13 1 sides that are positioned at cylinder suction port 10 1 sides, described second scavenge trunk 6 is communicated with the passage 16 of an access air, be provided with air throttle 17 in the described passage 16, open air throttle 17, introduce pure air by the passage on second scavenge trunk 6 16, when scavenging is carried out in second scavenge trunk 6, having realized at first being to use the scavenging of pilot air elder generation apart from the relief opening 13 second nearer scavenge trunks 6, is that fuel oil and Air mixing gas carry out scavenging then.And apart from use fuel oil and air Mixture to carry out scavenging in relief opening 13 first scavenge trunks 8 far away always, the time of these first scavenge trunk, 8 beginning scavengings can be arranged to the same with the time of second scavenge trunk, the 6 beginning scavengings that realize the pilot air scavenging, and it is different also can being arranged to.

Embodiment one:

Wherein, two first scavenge trunk 8 and two second scavenge trunks 6 that are positioned at cylinder block gas port 13 1 sides, described internal piston passage 15 is two, and described each internal piston passage 15 is communicated with the air inlet 7 and second scavenge trunk 6 that is positioned at the same side on cylinder 1 wall.

Fig. 1 and Fig. 2 illustrate the structure of cylinder 1 in the utility model two stroke engine first technological scheme, form a firing chamber 2 of defining by pistons reciprocating 3 in the cylinder 1, piston 3 is by the bent axle 14 of connecting rod 11 drive installations in crankcase 12, wherein, cylinder 1 is provided with: the relief openings 13 for waste gas 2 discharges from the firing chamber, relative substantially with relief opening 13 suction port 10 that advances mixed gas to crankcase 12, the pure air inlet 9 that at least one is relative substantially with relief opening 13, as shown in Figure 4, the air inlet 9 of engine air passage isolates two air inlets 7 on the inwall of described cylinder 1, cylinder 1 is positioned at described air inlet 9 (also being the suction port 10 that cylinder 1 is communicated with crankcase 12 a simultaneously) side and is provided with at least one first scavenge trunk 8 that enters firing chamber 2 as the fuel-air mixture body from crankcase 12, one end opening of this first scavenge trunk 8 leads to firing chamber 2, and the other end is communicated with crankcase 12.On the cylinder, be positioned at least one second scavenge trunk 6 as pilot air and mixed gas that is provided with of cylinder block gas port 13 1 sides, these second scavenge trunk, 6 one end openings lead to firing chamber 2, and the other end is communicated with crankcase 12.The structure of piston 3 in the utility model two stroke engine first technological scheme shown in Fig. 5, piston 3 is provided with at least one inner passage 15, Fig. 3 and Fig. 4 demonstrate piston 3 and are provided with two inner passages 15, when piston 3 runs to a specific fragment position, first opening 4 of an inner passage 15 is communicated with by the air scoop 7 that is opened on cylinder 1 inwall with the pure air inlet 9 of cylinder 1 in the piston 3, and second opening 5 of this inner passage 15 is communicated with the passage 6 of cylinder 1.Piston 3 is incorporated into the pure air of pure air inlet 9 in second scavenge trunk 6 in the certain location section, can make second scavenge trunk 6 realize the scavenging of pilot air elder generation, then by fuel oil and the scavenging of Air mixing gas.And first scavenge trunk 8 is not communicated with the inner passage 15 of piston 3 always, and first scavenge trunk 8 uses fuel oil and air Mixture to carry out scavenging always.The time of second scavenge trunk, 6 beginning scavengings can be arranged to more Zao, late or identical than first scavenge trunk 8.

Fig. 1 shows the location status that piston 3 is positioned at following, inner passage 15 first openings 4 and second opening 5 of piston 3 are sealed by cylinder 1 inwall, so in piston 3 whole stroke range, inner passage 15 can not be walked around second scavenge trunk 6 always and be communicated with crankcase 12, can guarantee in the inner passage 15 it is purer air always.

Embodiment two:

Fig. 6 and Fig. 7 show an embodiment of the utility model two stroke engine second technological scheme.In conjunction with Fig. 6, Fig. 7 and Fig. 1, form a firing chamber 2 of defining by pistons reciprocating 3 in the cylinder 1, piston 3 is by the bent axle 14 of connecting rod 11 drive installations in crankcase 12, wherein cylinder 1 is provided with: one for the relief opening 13 of waste gas from the firing chamber discharge, the suction port 10 that to crankcase 12 advances mixed gas relative substantially with relief opening 13, at least one enters first scavenge trunk 8 of firing chamber 2 from crankcase 12 as the fuel-air mixture body, one end opening of this first scavenge trunk 8 leads to firing chamber 2, and the other end is communicated with crankcase 12.Also have at least one second scavenge trunk 6 as pilot air and mixed gas, these second scavenge trunk, 6 one end openings lead to firing chamber 2, one ends and are communicated with crankcase 12.As shown in Figure 7, the inner passage 15 of first technological scheme as previously mentioned is not set in the piston 3, but the outer wall place that is positioned at second scavenge trunk 6 on cylinder 1 opens a passage 16, utilize this passage 16 to be incorporated into this second scavenge trunk 6 to air, be provided with air throttle 17 in the passage 16, air throttle 17 can be opened or closing passage 16 under the condition of setting.The scavenging of pilot air elder generation is realized in second scavenge trunk 6, then by fuel oil and the scavenging of Air mixing gas.And first scavenge trunk 8 uses fuel oil and air Mixture to carry out scavenging always.The time of second scavenge trunk, 6 beginning scavengings can be arranged to more Zao, late or identical than first scavenge trunk 8.Clearly show that among Fig. 6 and Fig. 7 that scavenge trunk described in the present embodiment is four, comprising two first scavenge trunk 8 and two second scavenge trunks 6 that are positioned at cylinder block gas port 13 1 sides that are positioned at cylinder suction port 10 1 sides.

Although in conjunction with figure the utility model is described above; but the utility model is not limited to above-mentioned embodiment; above-mentioned embodiment only is schematic; rather than it is restrictive; those of ordinary skill in the art is under enlightenment of the present utility model; under the situation that does not break away from the utility model aim, can also make a lot of distortion, these all belong within the protection of the present utility model.

Claims

1. two stroke engine, comprise cylinder (1), firing chamber (2), piston (3) and crankcase (12), it is characterized in that: cylinder (1) is provided with four scavenge trunks that are communicated with firing chamber (2) and crankcase (12), comprise two first scavenge trunk (8) and two second scavenge trunks (6) that are positioned at cylinder (1) relief opening one side that are positioned at suction port (10) one sides that cylinder (1) is communicated with crankcase (12), the air inlet of described engine air passage (9) isolates two air inlets (7) on the inwall of described cylinder (1); Described piston (3) is provided with two internal piston passages, and described each internal piston channel connection is positioned at air inlet (7) and second scavenge trunk (6) of the same side on cylinder (1) wall.

2. two stroke engine, comprise cylinder (1), firing chamber (2), piston (3) and crankcase (12), it is characterized in that: described cylinder (1) wall is provided with relative suction port (10) and relief opening (13), at least be provided with two scavenge trunks that are communicated with firing chamber (2) and crankcase (12) on the cylinder (1), comprising first scavenge trunk (8) that is positioned at cylinder (1) suction port (10) one sides be positioned at second scavenge trunk (6) of cylinder (1) relief opening (13) one sides, described second scavenge trunk (6) is communicated with the passage (16) of an access air, is provided with air throttle (17) in the described passage (16).

3. two stroke engine according to claim 2, it is characterized in that: described scavenge trunk is four, comprises two first scavenge trunk (8) and two second scavenge trunks (6) that are positioned at cylinder (1) relief opening (13) one sides that are positioned at cylinder (1) suction port (10) one sides.