CN1215128A

CN1215128A - Two-stroke engine

Info

Publication number: CN1215128A
Application number: CN 97119753
Authority: CN
Inventors: 陈晓冰
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-10-21
Filing date: 1997-10-21
Publication date: 1999-04-28

Abstract

The present invention relates to a two-stroke engine. It is characterized by that the relative positions of its scavenge port and exhaust port are changed, the position of the scavenge port is higher, and on the scavenge port, a check valve is mounted so as to form the invented engine with stratified charge and stratified combustion.

Description

A kind of two stroke engine

The present invention relates to a kind of two stroke engine.

On the century-old history of two stroke engine development, two stroke engine has suitable advantage always, as simple in structure, in light weight, volume is little, low cost and other advantages, but two stroke engine is because use the incoming mixture scavenging, make load higher, incoming mixture runs off also the more, and when idling and low-load, because the ratio of residual gas is big, it is also undesired to burn, and makes that hydrocarbon (HC) concentration in the discharging is higher, has increased the weight of atmospheric pollution.

Purpose of the present invention overcomes the prior art deficiency exactly, provides a kind of exhaust abundant rapidly, and charge air flow can quicken exhaust and incoming mixture is not discharged with waste gas, improves the motor of combustible gas utilization ratio.

The present invention realizes like this, the scavenge port of motor is than relief opening height, on the scavenge port of cylinder barrel one-way valve is arranged, during ventilation, fresh air flows to from scavenge port, under the effect of one-way valve, blow to cylinder head and diffusion along the cylinder barrel barrel, waste gas is squeezed downwards, discharge from the exhaust port of cylinder barrel bottom, the air-flow air flue is arranged with gas sampling on the cylinder, and discharge from outlet pipe.

Advantage of the present invention is: scavenge port and relief opening divide two-part up and down, scavenge port position height, charge air flow can not flow to relief opening, and charge air flow rises along the cylinder barrel barrel, the discord exhaust airstream intersects and mixes, do not disturb mutually, reduced discharge amount of pollution, the redesign of scavenge port and relief opening has overcome the gas port that changes gear and has interacted on the cylinder barrel circumference, help strengthening the gas port area that changes gear, and relief opening is exhaust comprehensively on circumference, has shortened the influence of relief opening to stroke, has improved engine power performance, reduced oil consumption, cost and voice.

Further specify below in conjunction with accompanying drawing.

Accompanying drawing 1 is the two stroke engine structural drawing.

Accompanying drawing 2 is interchangeable scavenge port cylinder barrel structural drawing.

Two stroke engine structural drawing as shown in Figure 1, it is by spark plug or oil sprayer 1, cylinder head 2, cylinder barrel 3, cylinder 4, exhaust port 5, inlet hole 6, piston 7, connecting rod 8, crankcase 9, one-way valve 10, scavenge port 11, air flue 12, air pressure balance groove 13, bent axle 14 is formed.Spark plug or oil sprayer 1 are fastened on the cylinder head 2, cylinder head 2 is fastened on the cylinder 4, crankcase 9 is fastened on cylinder 4 times, cylinder barrel 3 is fastened in the cylinder 4, fluted on the inwall of cylinder barrel 3, be connected with one-way valve 10 in the groove, thick thin down on the one-way valve 10, high resilience, and have guide vane to guarantee that charge air flow upwards and does not flow to the next door.Bent axle 14 rotates in crankcase 9, drives piston 7 to-and-fro motion in cylinder barrel 3 by connecting rod 8.When piston 7 moves upward, one-way valve 10 is closed, and inlet hole 6 is opened, and incoming mixture enters crankcase 9, then, piston 7 moves downward under the high-pressure gas effect, and this moment, suction port 6 was closed the gas compression in the crankcase 9, owing on the piston 7 air pressure balance groove 13 is arranged, therefore, the air pressure of one-way valve 10 the right and lefts equates that one-way valve 10 is closed.Piston 7 continues to move down, and high-pressure gas air pressure is greater than the pressurized gas air pressure of crankcase 9, and one-way valve 10 is closed, and piston 7 moves down again, and exhaust port 5 is opened, and high-pressure gas flows out from outlet pipe from the exhaust steam passage diffluence of cylinder barrel 3 exhaust port 5 all around to cylinder 4 again.At this moment, cylinder air pressure reduces rapidly, pressurized gas in the crankcase 9 is pushed one-way valve 10 open through air flue 12 and is flowed into cylinder from scavenge port 11, piston 7 is up again, the pressurized gas gas in the jar, the cylinder internal air pressure increases, under cylinder air pressure and one-way valve 10 elastic force effects own, one-way valve 10 is closed, and finishes gas exchange process.

Interchangeable scavenge port cylinder barrel as shown in Figure 2, it is by cylinder barrel 1, relief opening 2, suction port 3, one-way valve 4, thermal-protective coating 5, unidirectional electrical magnet 6, air gap hole 7, axle 8, scavenge port 9, electromagnet 10 is formed.Suction port 3 on the cylinder barrel 1 is minimum, and relief opening 2 is in the centre, and scavenge port 9 is the highest, scavenge port 9 is positioned at electromagnet 10, and electromagnet 10 is installed on the barrel of cylinder barrel 1, and the thermal-protective coating 5 that the centre has thermoinsulation material to make separates, one-way valve 4 is housed on the electromagnet 10, links together with axle 8.One-way valve 4 cambers are made with materials such as metal-base composites or carbon/carbon compound materials, and permanent-magnet material or unidirectional electrical magnet are arranged on it, and with guide vane water conservancy diversion and heat radiation.Because the one-way valve switching frequency is high, impact for reducing, permanent-magnet material or unidirectional electrical magnet 6 such as neodymium iron boron are arranged on the electromagnet 10, and separate with air gap hole 7, also can there be identical structure its underpart.Unidirectional electrical magnet 6 and electromagnet 10 1 work and push one-way valve 4 open, and when electromagnet 10 current direction change, one-way valve 4 is closed, and are subjected to the repulsive force of unidirectional electrical magnet or permanent-magnet material 6 in the moment that is about to adhesive, and one-way valve 4 speed are slowed down, and its motion is subjected to damping.The space too hour can be placed on field coil in the cylinder block on cylinder barrel, and the silicon steel plate on the cylinder barrel is a magnetism guiding access.

In the specific implementation, electromagnet on the one-way valve 4 can be no iron core alternating electromagnetism iron, its power supply is provided by magnetogenerator or storage battery, and be linked to be the loop with wiper mechanism, it is corresponding on cylinder liner then to be permanent-magnet material, as ferrite or neodymium iron boron, be contained in cylinder liner and the cylinder block, and with the axle link together, the axle and one-way valve 4 between wear-resistant sleeve is arranged, as copper, polytetrafluoroethylene, axle is middle and porose all around, plumbago or resistant to elevated temperatures lubricant oil advance from middle orifice flow, go out from orifice flow all around, lubricated attrition surface.The permanent-magnet material fuel oil that can polarize can put it in the accurate casing, and one-way valve is fixed on the casing, and has a horizontal assembly technology hole on cylinder block, during assembling, and the cylinder liner of packing into earlier, it is fixing casing to be put into auxiliary hole again.For avoiding one-way valve overheated, influence the insulation of coil, coil and one-way valve can be separated, and with guide vane with integral body of its affixed one-tenth, during scavenging, fresh air from the one-way valve bottom through this space to the cylinder head diffluence.Coil in the middle of the air flue face of permanent-magnet material and the air flue is a circular arc, and gap between them is minimum, and its center of circle is the center of circle of one-way valve.Information input current by bent axle timing detection, the one-way valve coil just is subjected to attraction force or repulsive force, perhaps form alternating force system with the elastic force and the electromagnetic force of spring, the promotion one-way valve sways, displacement mutually between circular arc coil and the permanent magnetism arc surface, but do not leave, so scavenge port is closed or is opened.The horizontal section of air flue is a circular arc, and the suction port on cylinder liner, scavenge port and relief opening should be divided into three layers of upper, middle and lowers, makes full use of the area of cylinder barrel barrel, reduces the loss to expansion space stroke.Simultaneously, reduce the suction port axial dimension, increase circumferential area and suction port quantity, it is abundant not only to help air inlet, also effectively reduces " regurgitating ".It is hemispherical that cylinder head becomes, and some strands of ventilation air-flows impact mutually in cylinder head and form turbulent flow, and fresh air forms stratified mixture combustion on top, and wedge plungers helps exhaust.When supercharging or injected fuel, repressurize or oil spout after exhaust close.Change current of electromagnet size and direction, with regard to the controlling non-return valve switch, at some specific operation, can change impulsive current, controlling non-return valve does not provide incoming mixture to cylinder.Slit between one-way valve and the cylinder barrel is minimum, and the degree of depth surpasses the thickness of one-way valve own, and around the one-way valve shirt rim is arranged, and avoids the surface of contact of high-temperature fuel gas ablation one-way valve and electromagnet.

Claims

1, a kind of two stroke engine, it is characterized in that: the scavenge port of motor is than relief opening position height, scavenge port has one-way valve on the inwall of cylinder barrel, the switch of one-way valve is being controlled the ventilation air-flow and is upwards being flowed along the cylinder barrel inwall, all around the outside exhaust of relief opening from the cylinder barrel lower end of the waste gas that burn of extruding, the exhaust steam passage on cylinder is to emission by exhaust pipe.

2, cylinder barrel as claimed in claim 1 is characterized in that: cylinder barrel inwall scavenge port place is fluted, and one-way valve wherein is housed, and is thick thin down on the one-way valve, high resilience, and have guide vane control charge air flow upwards to flow on it.

3, cylinder barrel as claimed in claim 1 is characterized in that: electromagnet is housed on the cylinder barrel, uses the thermal-protective material thermal insulation between electromagnet and the cylinder barrel, in the middle of the electromagnet scavenge port is arranged, scavenge port is controlled its switch by the one-way valve on the electromagnet.

4, one-way valve as claimed in claim 3 is characterized in that: it is to make with heat-resistant material, wherein is compounded with permanent-magnet material and unidirectional electrical magnet, and guide vane water conservancy diversion and heat radiation are arranged on it, and is connected on the electromagnet with axle.

5, the described one-way valve of electromagnet as claimed in claim 3 and claim 4, it is characterized in that: change the electromagnet current direction, just can adhesive or push one-way valve open, one-way valve is in adhesive or push open at the end, can be subjected to the damping of the opposite direction active force of unidirectional electrical magnet on the electromagnet or permanent-magnet material.

6, motor as claimed in claim 1 is characterized in that: the piston of motor has the air pressure balance groove by the scavenge port place, guarantees the air pressure balance on piston one-way valve both sides when pressurized gas.

7, one-way valve as claimed in claim 3, it is characterized in that: the electromagnet on the one-way valve is that arc does not have iron core alternating electromagnetism iron, itself and one-way valve wall are separated and affixedly become an integral body with guide vane, its corresponding permanent-magnet material is contained on cylinder barrel and the cylinder block, its air flue face is a circular arc, and the gap between the arc electromagnet is minimum, and the center of circle all is the center of circle of one-way valve.

8, relief opening as claimed in claim 1 is characterized in that: the size of relief opening shortens in stroke directions, and size strengthens on circumference, guarantees its area.

9, scavenge port as claimed in claim 1 is characterized in that: its charge air flow of plural scavenge port is impacted mutually in cylinder head and is formed turbulent flow, helps abundant burning.

10, cylinder barrel as claimed in claim 3 is characterized in that: cylinder barrel is too thin can not adorn electromagnet the time, and the electromagnetism iron rule is contained in the scavenge port place of cylinder, and the magnet steel on the cylinder barrel is the magnetic circuit passage.