CN208564783U

CN208564783U - Layered scavenging formula cylinder

Info

Publication number: CN208564783U
Application number: CN201821220008.9U
Authority: CN
Inventors: 王洪刚; 何艳卿
Original assignee: Hangzhou Weiye Garden Machinery Co Ltd
Current assignee: Hangzhou Weiye Garden Machinery Co Ltd
Priority date: 2018-07-31
Filing date: 2018-07-31
Publication date: 2019-03-01
Anticipated expiration: 2028-07-31

Abstract

The utility model discloses layered scavenging formula cylinders, including the crankcase being made of first half crankcase and later half crankcase, cylinder body is fixedly installed with right above the crankcase, scavenging air belt is offered on the inner sidewall of the cylinder body, scavenging air belt entrance is offered in the crankcase, the scavenging air belt and scavenging air belt are interconnected, air inlet pipe is fixedly installed on the side outer wall of the cylinder body, the air inlet pipe is connected to by the first air inlet and the second air inlet with the inner cavity of cylinder body, the cylinder body offers exhaust outlet far from the side of air inlet pipe, scavenging port is offered on the side wall of the cylinder body.The utility model improves on scavenging air belt and air inlet pipe, scavenging air belt is designed to closed type structure, air inlet pipe is provided with channel structure, top is divided into pure air air inlet, lower part is divided into mixed gas air inlet, realizes layered scavenging, reduces the evolution of incoming mixture, reduce exhaust contaminant, to reach environmental protection standard.

Description

Layered scavenging formula cylinder

Technical field

The utility model relates to gasoline engine cylinders, in particular to layered scavenging formula cylinder.

Background technique

Cylinder is the cylindrical metal parts for guiding piston to carry out straight reciprocating motion in cylinder.Air is in engine air Mechanical energy is converted heat by expansion in cylinder；Gas receiving piston in compresser cylinder compresses and improves pressure, works as work When plug is run from bottom dead centre to top dead-centre, air inlet is first opened, gasoline forms flammable mixing after mixing with air by carburetor Gas enters crankcase, meanwhile, with the continuation uplink of piston, the combustion mixture that previous tooling is recycled into combustion chamber is obtained Compression, soon reaches before top dead center in piston, spark plug starts to light a fire, and the compressed rapid burning expansion of gaseous mixture, promotion is plunderred The piston for crossing top dead-centre is run down；Air inlet is first closed when piston downlink, the gaseous mixture entered in crankcase is made to obtain precompressed, It gets ready for scavenging, when piston goes downwards to certain position, Exhaust Open, burned exhaust gas is arranged by muffler to sky In gas, when piston continues traveling downwardly a certain position, scavenging port is opened, and has the gaseous mixture of certain pressure to pour combustion chamber, to not arranging The residual gas gone out carries out punching and sweeps, and keeps exhaust gas discharge more thorough, while making incoming mixture full of combustion chamber, completes to combustion Burn the intake process of room.In this way, gasoline engine just completes a working cycles when piston returns bottom dead centre.

By working principle described above it is found that exhaust outlet is also when this two-stroke gasoline engine carries out scavenging process It opens, the incoming mixture without burning can also escape together with exhaust gas in this way, thus make exhaust gas discharge index severe exacerbation, It is extremely difficult to the emission limit requirement of national standard.

Utility model content

The purpose of the utility model is to provide layered scavenging formula cylinders.The utility model is in scavenging air belt and air inlet pipe On improve, scavenging air belt is designed to closed type structure, air inlet pipe is provided with channel structure, binary channels is at up-down structure point Cloth, top are divided into pure air air inlet (being equipped with check valve in the part), and lower part is divided into mixed gas air inlet, realize point Layer scavenging, greatly reduces the evolution of incoming mixture, greatly reduces exhaust contaminant, to reach environmental protection standard.

The technical solution of the utility model includes: layered scavenging formula cylinder, including be made of first half crankcase and later half crankcase Crankcase, be fixedly installed with cylinder body right above the crankcase, offer and sweep on the inner sidewall of the cylinder body Air flue offers scavenging air belt entrance in the crankcase, and the scavenging air belt and scavenging air belt are interconnected, and the one of the cylinder body Air inlet pipe is fixedly installed on the outer wall of side, the air inlet pipe passes through the inner cavity of the first air inlet and the second air inlet and cylinder body Connection, the cylinder body offer exhaust outlet far from the side of air inlet pipe, offer scavenging on the side wall of the cylinder body Mouthful.

In above-mentioned layered scavenging formula cylinder, first air inlet is located at the top of the second air inlet.

In layered scavenging formula cylinder above-mentioned, the scavenging port and exhaust outlet are respectively positioned on the first air inlet and the second air inlet Between.

In layered scavenging formula cylinder above-mentioned, first air inlet is provided with check valve close to the side of cylinder body Piece, the side of the check valve sheet are fixedly installed with check valve limit plate.

Compared with prior art, it is to be solved in the utility model be existing scavenging air belt scavenging effect difference problem, will sweep Tunnel is set as closed type structure, to form a relatively complete cavity；It is (used that two channels are provided in air inlet pipe Carburetor is also same), air flue below is mixed gas passage, and combustion mixture is directly entered crankcase by it；Above Air flue be pure air channel, the inside be equipped with check valve sheet, control the entry time of air, and close gas after air inlet Road prevents air from running away, first opens air inlet in the induction stroke of gasoline engine, piston stroking upward, combustion mixture enters crankshaft Case, as piston continues uplink, the negative pressure in crankcase incrementally increases and (can reach maximum in top dead-centre), when negative pressure reaches When to a certain degree, the check valve of oral area is opened in channel above air inlet pipe, and pure air is inhaled into, into and be stored in scavenging air belt In cavity, so, when piston downlink starts scavenging, the pure air being pre-stored in scavenging air belt first carries out punching and sweeps remaining give up Gas, subsequent incoming mixture just enters combustion chamber, to realize layered scavenging, greatly reduces the evolution of incoming mixture, Exhaust contaminant is greatly reduced, the good emission performance for having changed small two stroke gasoline reaches its discharge index easily very much The requirement of national standard.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of the utility model block-head cylinder；

Fig. 2 is the utility model cylinder mounting structure schematic diagram in gasoline engine；

In figure: 1- cylinder body；2- piston；3- scavenging air belt；The later half crankcase of 4-；5- first half crankcase；6- scavenging air belt enters Mouthful；7- check valve limit plate；8- check valve sheet；9- air inlet pipe；The first air inlet of 10-；The second air inlet of 11-；12- scavenging port； 13- exhaust outlet；14- crankcase.

Specific embodiment

The utility model is further described with reference to the accompanying drawings and examples, but is not intended as to the utility model The foundation of limitation.

Embodiment: layered scavenging formula cylinder, as shown in attached drawing 1-2, layered scavenging formula cylinder, including by first half crankcase 5 With the crankcase 14 of later half crankcase 4 composition, the surface of the crankcase 14 is fixedly installed with cylinder body 1, the cylinder It is provided with piston 2 in the inner cavity of ontology 1, offers scavenging air belt 3 on the inner sidewall of the cylinder body 1, in the crankcase 14 Scavenging air belt entrance 6 is offered, the scavenging air belt entrance 6 is interconnected with scavenging air belt 3, on the side outer wall of the cylinder body 1 It is fixedly installed with air inlet pipe 9, the inner cavity that the air inlet pipe 9 passes through the first air inlet 10 and the second air inlet 11 and cylinder body 1 Connection, the cylinder body 1 offer exhaust outlet 13 far from the side of air inlet pipe 9, offer on the side wall of the cylinder body 1 Scavenging port 12, in the prior art to be disadvantageous in that, for exhaust ports in opening-wide state, this will cause a part of mixing when scavenging Gas is escaped, which solves the problems, such as this using layer-stepping scavenging, i.e., go to complete scavenging by pure fresh air, then Traditional single air passage structure is replaced using the air inlet of Dual-channel type on design scheme into mixed gas is imported.

It is further preferred that first air inlet 10 is located at the top of the second air inlet 11, the first air inlet 10 is used for It is passed through pure air, the second air inlet 11 is for being passed through burning mixture, the air in piston downlink, in the first air inlet 10 It initially enters and carries out scavenging in cylinder body, after scavenging terminates, piston reaches 11 lower position of the second air inlet, can open inwards into Burning mixture.

It is further preferred that the scavenging port 12 and exhaust outlet 13 are respectively positioned on the first air inlet 10 and the second air inlet 11 Between, facilitate scavenging and exhaust.

It is further preferred that first air inlet 10 is provided with check valve sheet 8 close to the side of cylinder body 1, it is described The side of check valve sheet 8 is fixedly installed with check valve limit plate 7, which is pressure valve block, when the gas of one side end face Pressure is opened after reaching a certain critical value, and the setting of check valve sheet 8 is to control the air entry time and prevent air inlet After air escape.

During practice, as shown in Figure 2.To be solved in the utility model is that existing scavenging air belt is made into enclosed Structure, to form a relatively complete cavity；Two channels are provided in air inlet pipe 9, and (used carburetor is also therewith It is identical), air flue below is mixed gas passage, and combustion mixture is directly entered crankcase 14 by it；Air flue above is pure Air duct, the inside are equipped with check valve sheet 8, control the entry time of air, and close air flue after air inlet, prevent air It runs away, air inlet is first opened in the induction stroke of gasoline engine, 2 uplink of piston, combustion mixture enters crankcase 14, with work Plug continues uplink, and the negative pressure in crankcase 4 incrementally increases and (can reach maximum in top dead-centre), when negative pressure reaches a certain level When, air inlet pipe 9 above open in channel by the check valve of oral area, and pure air is inhaled into, into and be stored in the cavity of scavenging air belt 3 In, so, when 2 downlink of piston starts scavenging, the pure air being pre-stored in scavenging air belt 3 first carries out punching and sweeps residual gas, Subsequent incoming mixture just enters combustion chamber, to realize layered scavenging, greatly reduces the evolution of incoming mixture, greatly Reduce exhaust contaminant, the good emission performance for having changed small two stroke gasoline makes its discharge index easily reach very much country The requirement of standard.

Claims

1. layered scavenging formula cylinder, it is characterised in that: including the crankshaft being made of first half crankcase (5) and later half crankcase (4) Case (14) is fixedly installed with cylinder body (1) right above the crankcase (14), sets in the inner cavity of the cylinder body (1) It is equipped with piston (2), is offered scavenging air belt (3) on the inner sidewall of the cylinder body (1), offer and sweep in the crankcase (14) Air flue entrance (6), the scavenging air belt entrance (6) and scavenging air belt (3) are interconnected, on the side outer wall of the cylinder body (1) It is fixedly installed with air inlet pipe (9), the air inlet pipe (9) passes through the first air inlet (10) and the second air inlet (11) and cylinder body (1) inner cavity connection, the cylinder body (1) offer exhaust outlet (13), the cylinder body far from the side of air inlet pipe (9) (1) scavenging port (12) are offered on side wall.

2. layered scavenging formula cylinder according to claim 1, it is characterised in that: first air inlet (10) is located at second The top of air inlet (11).

3. layered scavenging formula cylinder according to claim 1, it is characterised in that: the scavenging port (12) and exhaust outlet (13) It is respectively positioned between the first air inlet (10) and the second air inlet (11).

4. layered scavenging formula cylinder according to claim 1, it is characterised in that: first air inlet (10) is close to cylinder The side of ontology (1) is provided with check valve sheet (8), and the side of the check valve sheet (8) is fixedly installed with check valve limit plate (7)。