CN2284863Y

CN2284863Y - Cylinder-scavenging device for two-stroke gasoline engine

Info

Publication number: CN2284863Y
Application number: CN 96240833
Authority: CN
Inventors: 韩伟明
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-09-17
Filing date: 1996-09-17
Publication date: 1998-06-24
Anticipated expiration: 2006-09-17

Abstract

The utility model relates to a cylinder-scavenging device for a two-stroke gasoline engine, which is mainly composed of an air cylinder, a crank linking mechanism, a piston, a crankshaft, a rotary phase valve plate, a crankcase, an air inlet, an air exchanging port, an air exhaust port, an air storage chamber, a flow regulating valve, etc. The scavenging device with simple structure is arranged on a universal two-stroke gasoline engine, and thus, the gasoline engine can reach the purposes of reliable operation, remarkable energy saving effect and harmful exhaust reduction.

Description

The two-stroke gasoline engine scavenging arrangement

The utility model belongs to automobile, motorcycle field of engineering technology, relates to a kind of two-stroke gasoline engine scavenging arrangement.

Existing two-stroke gasoline engine, mainly form by cylinder block, cylinder head, piston, connecting rod and crankcase, on cylinder wall different heights position, have window, be suction port, scavenge port and relief opening, wherein suction port is communicated with Carburetor with crankcase, and scavenge port is communicated with crankcase with cylinder, and relief opening is communicated with cylinder with outlet pipe, successively close these windows when utilizing piston to move up and down, to reach the purpose of distribution.Its crankcase seals, spark plug is housed on cylinder head, regularly with the mixed gas in the electrical spark point gas cylinder, during work, piston is moved to top dead center by lower dead center, successively close scavenge port and relief opening, piston top promptly becomes seal space, the mixed gas that a last work cycle enters cylinder is compressed, piston continues up, the crankcase space of sealing increases, pressure reduces, when piston moves to the suction port unlatching, the inflammable mixture that forms in the Carburetor is inhaled into crankcase, when piston stroking upward during near top dead center, spark plug sends electrical spark and lights compressed mixed gas, and expanded by heating behind the mixture combustion, piston are jumped over top dead center under the swelling pressure effect of combustion gas, move to lower dead center and realize power stroke, this moment, the mixed gas in the crankcase was compressed, when about 2/3 stroke of descent of piston, and Exhaust Open, waste gas after burning is gone out from relief opening under self pressure effect, the work done stage finishes, and lives and continues to move down, and scavenge port is opened, so the mixed gas that is compressed in the crankcase enters cylinder through scavenge port, under the guide functions of piston head, drive waste gas.Because this kind petrol engine is when being in little load operation, because of its air inflow few, the perturbation of gas weakens, it is bad to mixed gas is mixed, also lower because of the pressure of mixed gas when crankcase carries out precompression again, when scavenge port is opened, the mixed gas jet pressure is also low, so its injector stroke is shorter, residual gas is also driven not thorough, make mixed gas by waste gas towards rare serious, and have quite a few mixed gas to be trapped near the relief opening, at piston stroking upward, when relief opening is not closed by piston, this part mixed gas just is squeezed in the outlet pipe, mixed gas promptly occurs and is shorted to phenomenon in the outlet pipe.Thereby caused velocity of combustion to slow down, so that can not perfect combustion, engine power is descended, fuel consume increases, and has increased atmospheric pollution.

The purpose of this utility model provides a kind of two-stroke gasoline engine scavenging arrangement, and with the jet amount that the increase mixed gas enters cylinder, it is not thorough to solve exhaust, the insufficient defective of air inlet, thus can effectively improve the service behaviour of two-stroke gasoline engine.

The purpose of this utility model is to realize like this, this device mainly is made up of cylinder block, cylinder head, crank-connecting rod linkage mechanism, piston, bent axle, rotatable phase valve block, crankcase, gas storage chamber, suction port, scavenge port, relief opening etc., and wherein the rotatable phase valve block is packed on the interior crankshaft main journal of crankcase.Gas storage chamber is installed in the outside of crankcase, and the inner chamber of gas storage chamber is communicated with crankcase.The interface of gas storage chamber and crankcase be set at the corresponding crankcase side wall of rotatable phase valve block on.Between gas storage chamber and crankcase throttle valve is installed, this throttle valve is made up of valve body, spool, spring and control cable wire.

This practicality is owing to be provided with gas storage chamber, the mixed gas that in good time stores when opening, scavenge port can be discharged by it, realized thoroughly driveing the purpose of waste gas, promptly in suction stroke, mixed gas and the mixed gas in the Carburetor in the gas storage chamber together enter crankcase, like this, when it is subjected to precompression, the pressure that is produced strengthens, pressure when scavenging is carried out in the scavenge port unlatching is also big, and the injector stroke when mixed gas enters cylinder increases, thereby more thorough to the cleaning of waste gas, near the mixed gas that is trapped in the relief opening is greatly reduced, and the phenomenon that mixed gas is shorted in the outlet pipe descends greatly.Put throttle valve and can control the gas output of mixed gas in the gas storage chamber in good time, to reach best tonifying Qi effect.As long as install this scavenging arrangement simple in structure additional on general two-stroke gasoline engine, it is reliable that this petrol engine can reach, and energy-saving effect is remarkable, the purpose that noxious emission reduces.Concrete structure of the present utility model is provided by following mode of execution and accompanying drawing thereof:

Fig. 1 is a two-stroke gasoline engine scavenging arrangement overall structure plan view;

Fig. 2 is a two-stroke gasoline engine scavenging arrangement overall structure side view;

Describe specific structural details of the present utility model and working condition thereof in detail below in conjunction with accompanying drawing: this device mainly is made up of cylinder block 2, cylinder head 17, connecting rod 13, piston 4, bent axle 16, crankcase 6, suction port 7, scavenge port 3, relief opening 1 etc.Also be fixed with rotatable phase valve block 5 on the main journal 14 of the bent axle in crankcase 6, be provided with gas storage chamber 12 in the outside of crankcase 6, the inner chamber of this gas storage chamber 12 is communicated with crankcase 6, the interface 15 of gas storage chamber 12 and crankcase 6 be set at rotatable phase valve block 5 corresponding crankcase 6 sidewalls on, gas storage chamber 12 inner chambers can be communicated with crankcase 6 by 5 controls of rotatable phase valve block in good time.Rotatable phase valve block 5 is a circular steel plate jaggy, and it can rotate with bent axle 16 one, and is attached on crankcase 6 sidewalls, is provided with gas storage chamber interface 15 and mixed gas inlet 7 successively on crankcase 6 sidewalls that rotatable phase valve block 5 one sides are installed.If the residing crank angle of crank pin center line when being in lower dead center with piston 4 is 0 °, calculate by its sense of rotation, then the interface 15 of gas storage chamber 12 and crankcase 6 promptly is located between 0 °～20 °, mixed gas inlet 7 is located between 57 °～97 °, and the breach of rotatable phase valve block 5 is opened between 270 °～360 °.Gas storage chamber 12 is for storing the container of mixed gas, and its volume is 1～4 times of petrol engine discharge capacity.Throttle valve also is installed between gas storage chamber 12 and crankcase 6 simultaneously, this throttle valve is made up of valve body 11, spool 10, spring 9 and control cable wire 8, the aperture of throttle valve reduces with load and increases, and can also can handle with throttle linkage by control cable wire 8 individual operations during use.

Claims

1, a kind of two-stroke gasoline engine scavenging arrangement, this device mainly is made up of cylinder (2), crank-connecting rod linkage mechanism (13), piston (4), bent axle (16), crankcase (6), suction port (7), scavenge port (3), relief opening (1) etc., it is characterized in that: also be fixed with rotatable phase valve block (5) on the crankshaft main journal (14) in crankcase (6); Be provided with gas storage chamber (12) in the outside of crankcase (6), the inner chamber of gas storage chamber (12) is communicated with crankcase (6), the interface (15) of gas storage chamber (12) and crankcase (6) be set at the corresponding crankcase of rotatable phase valve block (5) (6) sidewall on.

2, according to the described a kind of two-stroke gasoline engine scavenging arrangement of claim, it is characterized in that: also be provided with a throttle valve between described gas storage chamber (12) and crankcase (6), this throttle valve is by valve body (11), spool (10), spring (9) and handle cable wire (8) formation.