CN201125778Y

CN201125778Y - Layered scavenging two cycle engine

Info

Publication number: CN201125778Y
Application number: CNU2007200989936U
Authority: CN
Inventors: 唐琦; 张宝欢; 包铁成
Original assignee: TIANJIN INTERNAL-COMBUSTION ENGINE INST
Current assignee: TIANJIN INTERNAL-COMBUSTION ENGINE INST
Priority date: 2007-12-18
Filing date: 2007-12-18
Publication date: 2008-10-01
Anticipated expiration: 2017-12-18

Abstract

The utility model discloses a layer purge two-stroke engine including a cylinder body and a crankcase, wherein a gas vent, an exhaust port and a scavenging duct are arranged on the cylinder body, and a piston and a connecting rod are arranged in the cylinder body; a depressed area forming an air reservior with the wall of the pinhole of the piston pin and the cylinder body is arranged on the circumference of the piston pin boss on the front and the back, wherein a venthole for communicating the cavity of the piston is arranged in the area of the depressed area, and a groove communicated with the pinhole of the depressed area and the piston pin is arranged on the skirt section of the piston. One side of the crankcase is provided with an air inlet pipe connecting with a carburetor, wherein the carburetor is connected with the air filter and the air filter is connected with the vent of the cylinder body through the vent pipe. The utility model has the advantages of solving the problems of high oil consumption and exhaust pollution in the traditional layer purge two-stroke engine and effectively avoiding the purge short circuit.

Description

The layered scavenging two stroke engine

Technical field

The utility model relates to a kind of motor, and in particular, the utility model relates to a kind of two stroke engine with layered scavenging function.

Background technique

Because two stroke engine has characteristics such as simple in structure, in light weight, that power per liter is big, so, popular to people.Yet owing to himself structural reason, the situation of scavenging short circuit often takes place in described two stroke engine, thereby causes oil consumption height, the serious problem of exhaust pollution.Therefore, along with the strictness further of Abgasgesetz and the progressively enhancing of people's environmental consciousness in recent years, the application of two stroke engine is restricted with the existence of development because of above-mentioned defective.In order to address this problem, people begin to carry out the R﹠D work of two stroke engine layered scavenging.

Present existing two-stroke gasoline engine scavenging arrangement, its constituted mode comprise cylinder block and piston and the crankcase etc. that are provided with scavenging air belt, and described crankcase connects Carburetor, and described cylinder block connects exhausting silencer gas.Its working principle is: utilize the variation in pressure in the described crankcase, make air form fuel mixture by Carburetor and gasoline and enter crankcase, make the fuel mixture that enters crankcase enter the firing chamber by the scavenging air belt that is provided with on the described cylinder block again.

The shortcoming of this two-stroke gasoline engine scavenging arrangement is: the unlatching of scavenging port and the unlatching of relief opening are overlapping, part is discharged with exhaust from the fuel mixture of scavenging air belt, cause short-circuit loss, it is inevitable that thereby the waste of the mixed gas when making scavenging becomes, therefore, can't solve high oil consumption and the serious problem of exhaust pollution that described two stroke engine exists always.

The model utility content

The purpose of this utility model solves the problem that above prior art exists exactly, provides a kind of and can avoid short-circuit loss, and effectively solve the layered scavenging two stroke engine of high oil consumption and exhaust pollution problem.

Layered scavenging two stroke engine of the present utility model, comprise cylinder block and crankcase, described cylinder block is provided with ventilating hole, relief opening and scavenging air belt, be provided with piston and connecting rod in the described cylinder block, described piston is connected by the wrist pin that its center is provided with pin-and-hole with connecting rod; Before the described piston, be provided with the depression position around the piston pin boss on back two sides, the pin-and-hole of described depression position and described wrist pin and the inwall of described cylinder block form gas storage chamber, be provided with the vent that is communicated with described piston cavity in the zone at described depression position, the skirt section of described piston has groove, the depression position around described groove and the described piston pin boss and the pin-and-hole of described wrist pin are connected, one side of described crankcase is provided with suction tude, described suction tude connects Carburetor, described Carburetor connects air-strainer, and described air-strainer is connected with the ventilating hole of described cylinder block by breathing pipe.

The depression position that is provided with around the described piston pin boss is with respect to the center symmetry of piston pin boss;

About the center symmetry of piston, and its two ends terminate in depression position that the forward and backward two sides of described piston is provided with respectively and communicate with described depression position described groove on half surface of described piston;

The vent of the described piston cavity of connection that is provided with on the described piston lays respectively in the zone at depression position, the forward and backward two sides of described piston, and the center of two vents overlaps.

The utility model compared with prior art has following beneficial effect:

(1) owing to has the groove that is connected with the pin-and-hole of depression position around the piston pin boss and wrist pin in the skirt section of described piston, so, utilize the mating reaction of itself and described cylinder block upper vent, when described piston stroking upward is relative with pistion recess to the ventilating hole of cylinder block, before can making described piston, the depression position on back two sides and piston pin hole and cylinder wall form gas storage chamber, so that import from the pure air of the described air-strainer groove by described piston skirt in the pin-and-hole of depression position around the piston pin boss and wrist pin, and enter the inner chamber of described piston by the vent on the described piston;

(2) owing to have the groove that is connected with depression position around the described piston pin boss and wrist pin pin-and-hole in the skirt section of described piston, so, utilize the mating reaction of scavenging air belt on itself and the described cylinder block, in described descent of piston process, make the pure air that is deposited in described piston pin boss peripheral recesses position and the wrist pin pin-and-hole and the pure air of piston cavity flow into cylinder block, the scavenging of going ahead of the rest in advance;

(3) because the pure air of use has carried out scavenging in advance, so, reduced the short-circuit loss that enters the fuel mixture of described cylinder block subsequently, reached the purpose that reduces oil consumption, reduces discharging;

(4) because the piston pin boss position of described piston is provided with the depression position, so, increased the tolerance of depositing around the described piston pin boss, can make the better effects if of scavenging in advance.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

Fig. 2 be in the utility model piston stroking upward to the schematic representation of ventilating hole and groove relative status;

Fig. 3 is the schematic representation of groove and ventilating hole relative status when piston stroking upward is to top dead center in the utility model;

Fig. 4 is the left view of Fig. 3;

Fig. 5 is the schematic representation of the utility model piston pin hole and scavenging air belt relative status when descent of piston;

Fig. 6 is the schematic representation that piston continues to come downwards to scavenging air belt open mode suitable for reading in the utility model;

Fig. 7 is a structure of piston schematic representation in the utility model;

Fig. 8 is the left view of Fig. 7;

Fig. 9 is the schematic representation of the C-C section of Fig. 7;

Figure 10 is the schematic representation of the B-B section of Fig. 7;

Figure 11 is the schematic representation of the A-A section of Fig. 7.

Embodiment

Below in conjunction with drawings and Examples the utility model is done to describe in detail.

As Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, shown in Figure 6, layered scavenging two stroke engine of the present utility model, comprise cylinder block 5 and crankcase 10, described cylinder block 5 is provided with ventilating hole 3, relief opening 6 and scavenging air belt 4, be provided with piston 7 and connecting rod 9 in the described cylinder block 5, described piston 7 is connected by the wrist pin 8 that its center is provided with pin-and-hole with connecting rod 9; One of the utility model difference with the prior art is; One side of described crankcase 10 is provided with suction tude 11, and described suction tude 11 connects Carburetor 12, and described Carburetor 12 connects air-strainer 1, and described air-strainer 1 is connected with the ventilating hole 3 of described cylinder block 5 by breathing pipe 2; Two of the utility model difference with the prior art is: be provided with around the piston pin boss on described piston 7 forward and backward two sides as Fig. 7, Fig. 8, Fig. 9, Figure 10, depression position 13 shown in Figure 11, be provided with in the zone at described depression position 13 be communicated with described piston 7 inner chambers vent 14, because the inner chamber of described piston 7 communicates with described crankcase 10, so described vent 14 also is communicated with described crankcase 10 simultaneously.

Fig. 8, Fig. 9, Figure 10, Figure 11 show the structure situation of piston described in the utility model 7 in the mode of the left view of Fig. 7, C-C sectional drawing, B-B sectional drawing, A-A sectional drawing respectively.As seen from the figure, the skirt section of described piston 7 has groove 15, and the depression position 13 around described groove 15 and the described piston pin boss and the pin-and-hole of described wrist pin 8 are connected; The depression position 13 that is provided with around the described piston 7 upper piston key seats is with respect to the center symmetry of piston pin boss, and its have than prior art bigger deposit the headroom; Described groove 15 on half surface of described piston 7 about the center symmetry of described piston 7, and its two ends terminate in the depression position 13 that described piston 7 forward and backward two sides are provided with respectively, and the pin-and-hole of described depression position 13 and described wrist pin 8 and the inwall of described cylinder block 5 form gas storage chamber; The inner chamber of the described piston 7 of connection that is provided with in the zone at depression position 13, described piston 7 forward and backward two sides and the vent 14 of crankcase 10 have two, and the center of described two vents 14 overlaps.

Layered scavenging function of the present utility model is achieved in that

(1) when the groove on ventilating hole 3 that described piston 7 goes upward to described cylinder block 5 and the described piston 7 15 is relative, described groove 15 communicates with the ventilating hole 3 of described cylinder block 5, make pure air enter cylinder block 5 by breathing pipe 2 and ventilating hole 3 from described air-strainer 1, wherein the pure air of part enters in the pin-and-hole of depression position 13 around the described piston pin boss and described wrist pin 8 along the groove 15 of described piston 7, and the pure air of part enters the inner chamber (seeing Fig. 2, Fig. 7, Fig. 8, Fig. 9, Figure 10, Figure 11) of described piston 7 by described vent 14;

(2) when described piston 7 walks to top dead center, the groove 15 of described piston 7 still communicates with the ventilating hole 3 of described cylinder block 5, make pure air enter cylinder block 5 by breathing pipe 2 and ventilating hole 3 from described air-strainer 1, and enter along described groove 15 in the pin-and-hole of depression position 13 around the described piston pin boss and wrist pin 8, enter the inner chamber (seeing Fig. 3, Fig. 4, Fig. 7, Fig. 8, Fig. 9, Figure 10, Figure 11) of piston 7 simultaneously by vent 14;

When (3) pin-and-hole that comes downwards to depression position 13 around the described piston pin boss and described wrist pin 8 when described piston 7 and described scavenging air belt 4 are relative, remain in described piston pin boss depression position 13 and described wrist pin 8 pin-and-holes pure air interior and piston 7 inner chambers the top (see figure 5) that flows into described scavenging air belt 4 on every side;

(4) continue when descending when described piston 7, the suitable for reading of described scavenging air belt 4 opened, the firing chamber that makes the pure air that is deposited in described scavenging air belt 4 tops and described depression position 13 and described wrist pin 8 pin-and-holes flow into cylinder block 5 scavenging (see figure 6) of going ahead of the rest.

The unique texture that the utility model had makes it can utilize the in advance scavenging of pure air realization to the firing chamber, has not only reduced entering the short-circuit loss of the fuel mixture of firing chamber subsequently, and has reached the purpose that reduces oil consumption, reduces discharging; Again because the utility model at first utilizes pure air that scavenging has in advance been carried out in the firing chamber, then just make fuel mixture enter the firing chamber, so, the traditional two stroke engine that compares has really possessed the function of layered scavenging, thereby has well solved the high and serious problem of exhaust pollution of the ubiquitous oil consumption of existing two stroke engine.

Below schematically the utility model and mode of execution thereof are described, this description does not have restricted, and shown in the accompanying drawing also is one of mode of execution of the present utility model.If those of ordinary skill in the art is enlightened by it, under the situation that does not break away from the utility model creation aim, design and the same or analogous structure of this technological scheme without creationary, all should belong to protection domain of the present utility model.

Claims

1. layered scavenging two stroke engine, comprise cylinder block and crankcase, described cylinder block is provided with ventilating hole, relief opening and scavenging air belt, is provided with piston and connecting rod in the described cylinder block, and described piston is connected by the wrist pin that its center is provided with pin-and-hole with connecting rod; It is characterized in that: be provided with around the piston pin boss on the forward and backward two sides of described piston and can form the depression position of gas storage chamber with the pin-and-hole of described wrist pin, the inwall of cylinder block, be provided with the vent that is communicated with described piston cavity in the zone at described depression position, the skirt section of described piston has the groove that is connected with the pin-and-hole of described depression position and described wrist pin; One side of described crankcase is provided with suction tude, and described suction tude connects Carburetor, and described Carburetor connects air-strainer, and described air-strainer is connected with the ventilating hole of described cylinder block by breathing pipe.

2. layered scavenging two stroke engine according to claim 1 is characterized in that: the depression position that is provided with around the described piston pin boss is with respect to the center symmetry of piston pin boss.

3. layered scavenging two stroke engine according to claim 1, it is characterized in that: about the center symmetry of piston, and its two ends terminate in depression position that the forward and backward two sides of described piston is provided with respectively and communicate with described depression position the groove of described piston skirt on half surface of described piston.

4. layered scavenging two stroke engine according to claim 1 is characterized in that: two vents that are provided with on the described piston lay respectively in the zone at depression position, the forward and backward two sides of described piston.

5. layered scavenging two stroke engine according to claim 1 is characterized in that: the center of described two vents overlaps.