CN201560858U

CN201560858U - Engine piston

Info

Publication number: CN201560858U
Application number: CN2009202510751U
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: 2009-11-30
Filing date: 2009-11-30
Publication date: 2010-08-25
Anticipated expiration: 2019-11-30

Abstract

The utility model discloses an engine piston, which comprises a piston top and a piston skirt, wherein the piston skirt is provided with at least one closed channel (15); the two ends of the closed channel (15) are respectively provided with a first opening (4) and a second opening (5), and the positions of the first opening (4) and the second opening (5) are respectively aligned to the positions of the air inlet of an engine cylinder and the scavenging air belt opening on the cylinder wall. The closed channel (15) can communicate the air inlet on the cylinder and the scavenging air duct opening which is very close to the air exhaust of the cylinder, so the engine piston of the utility model can realize that the scavenging air duct far away the air inlet of the cylinder can be firstly scavenged with pure air and then is scavenged with gas mixture, so the air channel of the piston can avoid the scavenging air duct using gas mixture, thereby, the goal of reducing the engine emission can be better achieved.

Description

A kind of engine piston

Technical field

The utility model relates to a kind of engine piston, especially relates to a kind of can the realization and carries 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 engine piston of reduction engine emission.

Background technique

The two stroke engine piston of prior art generally is not provided with special air passageways, adopt the two stroke engine of layered scavenging technology, air passageways can be set, to realize that air enters scavenging air belt from air inlet by the air passageways on the piston on piston.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, purpose of the present invention also is by a kind of engine piston is provided, utilize this engine piston can realize that the scavenging air belt far away apart from suction port carries out scavenging with pure air earlier, and then carry out scavenging, better to reach the purpose that reduces engine emission with mixed gas.

In order to solve the problems of the technologies described above, the technological scheme that a kind of engine piston of the utility model is achieved is, this piston comprises piston head and piston skirt, and described piston skirt is provided with at least one enclosed passage, and the two ends of described enclosed passage are respectively arranged with first opening and second opening.

The utility model engine piston, wherein, the position of described first opening and second opening respectively with engine cylinder on suction port and the position, scavenging road junction on the cylinder wall align.

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

Earlier carry out scavenging by the structure that changes the prior art engine piston to realize the scavenging air belt far away, and then carry out scavenging, better to reach the purpose that reduces engine emission with mixed gas with pure air apart from suction port.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.

Description of drawings

Fig. 1 is the axial schematic representation of the utility model engine piston;

Fig. 2 is that the end of piston shown in Fig. 1 is to cross-sectional schematic;

Fig. 3 is the two stroke engine structural representation that has utilized piston shown in Figure 1;

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

Embodiment

The flesh and blood of the utility model engine piston is: how to utilize the change structure of piston to realize that the scavenging air belt far away apart from the cylinder suction port carries out scavenging with pure air earlier, and then carry out scavenging with mixed gas, better to reach the discharging that reduces motor.A knot the drawings and specific embodiments are done to describe in further detail to the utility model below.

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 rods, 12. crankcase, 13. relief openings, 14. bent axles, 15. piston enclosed passages.

As depicted in figs. 1 and 2, a kind of engine piston 3 of the utility model comprises piston head and piston skirt, described piston skirt is provided with at least one enclosed passage 15, the two ends of described enclosed passage 15 are respectively arranged with first opening 4 and second opening 5, as shown in Figure 3 and Figure 4, this piston 3 is installed in the supporting with it motor, the position of described first opening 4 and second opening 5 respectively with engine cylinder 1 on suction port 9 and the position, scavenging road junction on the cylinder wall align.

Being provided with two enclosed passages 15 with the piston skirt below is that example specifically describes the effect of enclosed passage in engine operation on this piston, as shown in Figure 3, installed in the cylinder 1 of formed two stroke engine behind the utility model piston and formed a firing chamber 2 of defining by pistons reciprocating 3, 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 the utility model engine piston 3 shown in Fig. 1, Fig. 2, piston 3 is provided with at least one enclosed passage 15, Fig. 3 and Fig. 4 demonstrate piston 3 and are provided with two enclosed passages 15, when piston 3 runs to a specific fragment position, first opening 4 of an enclosed 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 enclosed 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 enclosed 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.

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. an engine piston comprises piston head and piston skirt, and its spy is being: described piston skirt is provided with at least one enclosed passage (15), and the two ends of described enclosed passage (15) are respectively arranged with first opening (4) and second opening (5).

2. engine piston according to claim 1 is characterized in that: the position of described first opening (4) and second opening (5) respectively with engine cylinder on suction port and the position, scavenging road junction on the cylinder wall align.