CN2511795Y

CN2511795Y - Two stroke IC engine with scavenging cylinder

Info

Publication number: CN2511795Y
Application number: CN 01279222
Authority: CN
Inventors: 周义农
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-12-19
Filing date: 2001-12-19
Publication date: 2002-09-18
Anticipated expiration: 2011-12-19

Abstract

The utility model belongs to a technology for improving the thermal efficiency of internal combustion engine, in particular to a two-stroke IC engine with a scavenging cylinder. In addition of two main cylinders, the engine is provided with an exchange cylinder, wherein, a volume of the exchange cylinder is one half of a volume of the main cylinder, an air intake is arranged in the center of the top part of a cylinder casing of the exchange cylinder, while exhaust ports are arranged on the two sides of the exchange cylinder respectively , and the exhaust ports are respectively communicated with each air intake in each side of top parts of cylinder casings of the two main cylinders through pipelines, and carburetors are arranged on the communicating pipelines. The engine, under a condition that a necessary work loss is increased less, ensures that a thermal power conversion ratio is obviously improved than the prior engine types, and a waste gas pressure is greatly reduced, defects of exchange economy and bad exchange quality of the prior two stroke engine are improved.

Description

Poly-scavenging becomes waste gas specific votume type two stroke IC engine at the bottom of the direct current

Technical field:

The utility model belongs to the technology that improves internal combustion engine thermal efficiency, and poly-scavenging becomes waste gas specific votume type two stroke IC engine at the bottom of particularly a kind of direct current.

Background technique:

Existing ignition internal combustion engine is the constant volume heating type, and its waste gas specific volume equates that with new gas specific volume waste gas pressure is far above ambient pressure.Two stroke machines do not have special intake and exhaust stroke, its ventilation be by descent of piston later stage and up initial stage be 120 ° at crank angle---realize by scavenging pump, scavenging port and relief opening in 150 ° the scope.Therefore, constant volume heating type internal combustion engine thermal efficiency is only relevant with pressure ratio, and existing two stroke machines are short because of scavenging stroke, and new, waste gas specific volume equates that make new, the easy mixing of waste gas, it is less economical to take a breath, and ventilation quality is perfect not to the utmost.Because of existing drive manner makes the exhaust gas pressure basic fixed, be difficult to significantly improve its pressure ratio again, thereby limited its hot merit conversion ratio again.

Summary of the invention:

Goal of the invention of the present utility model provides a kind of the damage in necessary merit to be increased under few situation, the hot merit conversion ratio is significantly improved than existing type, exhaust gas pressure is reduced greatly, and poly-scavenging becomes waste gas specific votume type two stroke IC engine at the bottom of the ventilation Economy of the existing two stroke machines of improvement and the direct current of ventilation quality difference.

The technological scheme that realizes the foregoing invention purpose is: except that internal combustion engine components such as master cylinder A, B, it also comprises a ventilation cylinder C, the volume of this ventilation cylinder C is half of master cylinder volume, its cylinder barrel crown center is provided with a suction port, respectively there is a relief opening both sides, this relief opening is communicated with the cylinder barrel top avris suction port separately of master cylinder A, B by pipeline respectively, on this connecting pipeline Carburetor is housed.

The type that technique scheme provides, taked with situation that existing type charge and pressure ratio equate under increased the method for one times of working stroke, thereby make the waste gas specific volume increase one times, it is equivalent to press down frequently in waste gas specific volume condition, and existing type pressure ratio has increased one times, thereby significantly improved the thermal efficiency, reduced exhaust gas pressure, again because of the decline of exhaust gas pressure, reduced exhaust noise, its ventilation adopts one times of fast cylinder to link to each other with suction port because the guide functions of suction port, make heavy new gas along the direct projection of cylinder barrel wall bottom the cylinder barrel, extrude and the high-temp waste gas of light specific gravity had by the relief opening at cylinder barrel top, finish ventilation.Because of new, waste gas specific volume difference, make new, waste gas mixing rate is little, be half of master cylinder volume because of changing seven cylinder volumes again, and scavenging stroke can be 90 ° of crank angles---carry out in 180 ° the scope, and taked the end to gather the scavenging mode, make new gas loss minimum, ventilation quality is improved, and has improved the Economy of two stroke IC engine ventilation.Thermal efficiency comparative trial can improve 20%.

Description of drawings:

Structural representation when Fig. 1 launches for the utility model.

Fig. 2 is the utility model master cylinder piston and ventilation cylinder piston operation schematic representation.

Fig. 3 is a master cylinder cylinder cap plan view of the present utility model.

Among the figure, piston 1, cylinder barrel 2, relief opening 3, spark plug 4, suction port 5 constitute master cylinder A, piston 15, cylinder barrel 14, relief opening 13, spark plug 12, suction port 11 constitute master cylinder B, and cylinder barrel 16, piston 17, suction port 8, relief opening 7,9 constitute ventilation cylinder C.

Embodiment:

Provide embodiment of the present utility model below in conjunction with accompanying drawing.

The volume of ventilation cylinder C is half of master cylinder A or B volume, its crown center is provided with suction port 8, respectively there is a relief opening 7,9 both sides, this relief opening 7,9 is communicated with cylinder barrel 2 and the 14 top avris suction port 5,11 separately of master cylinder A, B by pipeline respectively, and Carburetor 6,10 is housed respectively on this connecting pipeline.The spark plug 4,12 of master cylinder A, B deviates from separately cylinder barrel 2,14 medial axis and near suction port 5,11, its piston 1,15 tops are provided with the taper conflux groove 18,19 corresponding with this spark plug 4,12, and the oral area of this conflux groove 18,19 is being provided with inside groove along 20,21 near cylinder barrel medial axis one side.The advantage of this structure is that it can block air-flow and stretches out, and helps gas stream and assembles the burning work done.The suction port of this master cylinder A, B is strip along cylinder week, and its relief opening is flat ellipse shape structure, has realized that inlet and outlet are evenly rapid, improves the Economy of operation.

Working principle of the present utility model is summarized as follows: expansion space stroke finished when the piston 1 of master cylinder A moved to lower dead center (1 point), simultaneously relief opening 7 open be depressured in the cylinder identical with external pressure, the cylinder piston 17 of taking a breath this moment moves to lower dead center, and its suction port 8 is closed, and relief opening 7 is opened.When the A cylinder crankshaft moves to lower dead center (2 point), suction port 8 is opened, new gas is pressed into the A cylinder, A cylinder waste gas is extruded from this relief opening 7, when the A cylinder crankshaft moved at 3, ventilation cylinder piston 17 moved to top dead center, and the mouth of A cylinder inlet and outlet simultaneously 5,3 is closed, ventilation cylinder suction port 8 is opened, and relief opening 7 is closed.Master cylinder A ventilation finishes, and its piston 1 continues up, and new gas is compressed, and when row during to top dead center (4), compression finishes, and spark plug 4 igniting simultaneously, combustible gas burning are boosted, and to promote piston 1 descending.When the bent axle of master cylinder A by point 3 in the process of point 4, the ventilation cylinder has been finished a work cycle again, its suction port 8 and relief opening 9 coordinations therebetween are for master cylinder B ventilation.This process is carried out continuously, finishes the function conversion.The running of this machine under different operating modes regulated common the realization by ventilation cylinder intake valve throttling and Carburetor 6,10 fuel feeding liquid levels.

With the contrast of existing four lines same displacement friction area, analyze the ratio of profit increase of this machine.If the friction area of an existing stroke of machine is a, then the friction area of a stroke of this machine master cylinder and ventilation cylinder is 3/22a, the friction area that existing machine is finished a work cycle is 4a, the friction area that this machine is finished a work cycle is 2 (3/22a) ≈ 4.24a, as seen this machine is finished the friction area of a work cycle than existing four-journey machine under the situation that momentum equates, only increased 0.24a, its increment rate is 0.24a/4a=6%, and it consumes 3% of gain.It is about 20% to know that by theoretical calculation its thermal efficiency has increased, and being equivalent to this machine actual gain is 17%, and it all is converted into useful mechanical work.

Claims

1, poly-scavenging becomes waste gas specific votume type two stroke IC engine at the bottom of a kind of direct current, comprise master cylinder A, B, it is characterized in that it also comprises a ventilation cylinder C, the volume of this ventilation cylinder C is half of master cylinder volume, its cylinder barrel crown center is provided with a suction port, respectively there is a relief opening both sides, and this relief opening is communicated with the cylinder barrel top avris suction port separately of master cylinder A, B by pipeline respectively, on this connecting pipeline Carburetor is housed.

2, poly-scavenging becomes waste gas specific votume type two stroke IC engine at the bottom of the direct current according to claim 1, the spark plug that it is characterized in that this master cylinder A, B deviates from the cylinder barrel medial axis and close suction port, its piston head is provided with the taper conflux groove corresponding with this spark plug, and the oral area of this conflux groove is being provided with inside groove edge near cylinder barrel medial axis one side.

3, poly-scavenging becomes waste gas specific votume type two stroke IC engine at the bottom of the direct current according to claim 1, it is characterized in that the suction port of this master cylinder A, B is strip along cylinder week, and its relief opening is flat ellipse shape.