CN208220853U - A kind of diesel valve mechanism that can form intake swirl - Google Patents

Abstract

The purpose of this utility model is to provide the diesel valve mechanisms that one kind can form intake swirl, including the first camshaft, the second camshaft, the second intake valve and second row air valve is arranged on the second camshaft in first intake valve and first row air valve below first camshaft.The utility model two bursts of charge air flows to generate dislocation to liquidate effect, in addition guiding role of the cylinder inner wall to air-flow, two bursts of charge air flows are made to form the vortex mutually wound, so as to improve oil, the mixing of gas and the burning of gaseous mixture, improve the acting ability and its economy of engine, and exhaust pollution can be mitigated, be beneficial to energy conservation emission reduction.

Description

A kind of diesel valve mechanism that can form intake swirl

Technical field

The utility model relates to a kind of diesel engines, specifically the air inlet and exhaust valve structure of four-cycle diesel.

Background technique

Diesel engine is that a kind of very important engineering dynamic is mechanical, suffers from extensive use in many industrial circles and can not The status of substitution.

Diesel engine has many good qualities, and most outstanding is its higher thermal efficiency and economy.Unlike gasoline engine, Diesel engine uses the ignition mode of compression ignition, and cylinder sucking ozone is simultaneously compressed, and sprays into fuel, fuel in compression terminal Spraying and air carries out ignition while mixing.Due to the ignition mode of this compression ignition, so that pressure of the fuel in burning Power is relatively high with temperature, and fuel combustion is more abundant, can release more heats for doing work, therefore the thermal efficiency is high, economical Property is good.Secondly because diesel engine does not need ignition system, and oil supply system is relatively easy, so the reliability of diesel engine is also more It is high.

Diesel engine is widely used in the every field such as communications and transportation, engineering machinery.It is small to arrive motor in traffic and transport field Vehicle, it is big to large-scale ocean-going freighter, the figure of diesel engine can be seen, in some other engineering machinery fields, diesel engine Application it is also very extensive.

But diesel engine needs to solve while possessing lot of advantages and obtaining extensive use there are also some problems.Example Efficiency of combustion as how further increased diesel fuel, keeps fuel combustion more abundant, to improve the economy of diesel engine Property, it is a good problem to study.What it is due to diesel engine sucking is fresh air rather than the gaseous mixture of air and fuel Body, therefore the efficiency of combustion of fuel is determined in the mixing situation of fuel injector injection fuel post fuel and air.Fuel and air Mixing is more uniform, and just more sufficiently, atural beat is more efficient, and economy is more preferable for fuel combustion.

Improve oil, there are mainly two types of measures for the mixing of gas.One is improvement oil spout technologies, such as pass through and increase injection pressure Keep oil mist particles more tiny, to be conducive to the uniform mixing of mist of oil and air, improves burning quality；Another kind be tissue into Gas eddy stream, forms vortex after allowing air to enter cylinder by some measures, intake swirl can improve oily, gas mixing and mix Close the burning of gas.

The method of existing tissue intake swirl is simultaneously few, mainly has tangential air flue, helical intake, using the side such as air guide screen Formula, these methods all respectively have its shortcoming.It is substantial in such a way that tangential air flue or helical intake form intake swirl It is to be redesigned to air intake duct, the shortcomings that this mode is structure or processes more complicated, the change to cylinder head It is more, it is not necessarily reliable so as to cause using.Although and be easier to realize by the way of air guide screen, the disadvantage is that air inlet hinder Power is larger, and be easy to cause jamming of valve and eccentric wear, causes poorly sealed.So the method for existing tissue intake swirl is big Mostly ineffective or system reliability is poor, there is apparent shortcoming.

Summary of the invention

The purpose of this utility model is to provide intake swirl is capable of forming, so as to improve the mixing and mixing of oil, gas One kind of gas burning can form the diesel valve mechanism of intake swirl.

Purpose of the utility model is realized as follows:

The utility model one kind can form the diesel valve mechanism of intake swirl, it is characterized in that: including the first cam Axis, the second camshaft, are arranged the first air inlet valve cam and first exhaust valve cam on the first camshaft, under the first air inlet valve cam First exhaust valve spring, the first inlet valve spring lower section is arranged in the first inlet valve spring of side's setting, first exhaust valve cam lower section First intake valve is set, first row air valve is set below first exhaust valve spring, it is convex that the second intake valve is arranged on the second camshaft Wheel and second exhaust valve cam, the second air inlet valve cam lower section are arranged the second inlet valve spring, set below second exhaust valve cam Second exhaust valve spring is set, the second intake valve, setting second below second exhaust valve spring are set below the second inlet valve spring Exhaust valve.

The utility model can also include:

1, the first intake valve and the second intake valve are diagonally arranged, and first row air valve and second row air valve are diagonally arranged.

2, the phase of the first air inlet valve cam and the second air inlet valve cam is consistent, first exhaust valve cam and second row air valve The phase of cam is consistent.

3, angle between the first intake valve and the bottom surface and the second intake valve and the bottom surface of second row air valve of first row air valve It is 150 ° ± 5 °.

The advantage of the utility model is:

1, compared with four traditional valve trains, under the premise of hardly increasing system complexity, pass through charge air flow Dislocation liquidate the good intake swirl of affected tissues, improve oil, the mixing of gas mentions to be conducive to the completely burned of fuel The performance of high engine and its economy, and exhaust pollution can be mitigated, it is beneficial to energy conservation emission reduction.

2, compared with the mode of its existing hetero-organization intake swirl, the utility model structure is simple, reliable operation, manufacture Easy for installation, little with traditional air valve structure difference, only need to redesign arrangement to overhead cam mechanism and entering and exhaust channel is It can.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of the utility model.

Specific embodiment

It illustrates with reference to the accompanying drawing and the utility model is described in more detail:

In conjunction with Fig. 1, the utility model one kind can form the diesel valve mechanism of intake swirl, including two intake valves 2, two exhaust valves 6 and valve actuation mechanism.Valve actuation mechanism is overhead cam form, including spring 3, cam 4, cam The structures such as axis 5.

Four air valves in Fig. 1 include two intake valves 2 and two exhaust valves 6, and two intake valves and two exhaust valves are all It is arranged diagonal, the bottom surface of this two rows of valve forms about 150 ° of angle.The driving method of this valve train and traditional air valve Mechanism is similar, equally uses cam drive mechanism.

The concrete operating principle of the utility model are as follows:

When a new working cycles start, two intake valves are opened simultaneously, and piston is moved downward from top dead centre makes gas Negative pressure state is formed in cylinder, fresh air flows into cylinder from intake valve, this is induction stroke.Since two intake valves are in diagonal cloth It sets, therefore two bursts of charge air flows can produce dislocation and liquidate effect, along with cylinder inner wall is to the guiding role of air-flow, so that two Stock charge air flow forms the vortex mutually wound.

Fresh air constantly flows into cylinder from intake valve in a steady stream, until piston comes downwards to lower dead center, then intake valve close It closes, piston starts to move upwards under the drive of crank link mechanism, and compression stroke starts.Intake swirl meeting in compression process Enhanced, so vortex can be always maintained at.When piston stroking upward is near top dead center, fuel injector to in-cylinder injection fuel, Fuel mixes rapidly with air and ignition at high temperature under high pressure.Due to the presence of intake swirl, the mixing of fuel and air Speed is improved, and can realize uniform mixing in a very short period of time, so that fuel combustion is more abundant, can be discharged More energy is for doing work.

Fuel fire burning releases energy, and pushes piston moves downward externally to do work.When piston reaches near lower dead center, Two exhaust valves open simultaneously, subsequent piston upwards, and cylinder is discharged in the exhaust gas that gas in-cylinder combustion is generated, and complete entire work It recycles.

The utility model is used for the intake swirl of tissue diesel engine, by the diagonal design of intake valve, so that two bursts of air inlets Air-flow can generate the dislocation effect of liquidating, in addition guiding role of the cylinder inner wall to air-flow, forms intake swirl, so as to improve Oil, the mixing of gas and the burning of gaseous mixture, improve the acting ability and its economy of engine, and it is dirty to mitigate exhaust Dye, is beneficial to energy conservation emission reduction.

There are two intake valve and two exhaust valves for each cylinder of diesel engine, but this valve train is unlike traditional four Such two air inlet valve positions of valve train are in the same side, and two exhaust valves are in the other side, but two intake valves are in diagonal cloth It sets, i.e. in the diagonal positions of another intake valve, exhaust valve is equally arranged diagonal an intake valve.

Fresh air enters cylinder from two intake valves on both sides simultaneously, and two strands of air-flows can generate dislocation and liquidate effect, In addition guiding role of the cylinder inner wall to air-flow, so that air inlet forms vortex, so as to improve oil, the mixing of gas and gaseous mixture Burning.

Valve actuation mechanism equally uses cam mechanism, by the redesign to transmission mechanism and inlet and outlet road, realizes Intake valve and exhaust valve it is diagonally arranged.

The characteristics of valve actuation mechanism are as follows: the opening and closing of air valve by overhead cam mechanism controls, two exhaust valves respectively have one it is convex Wheel shaft, and two cams being fixed on camshaft.Two cams on every camshaft are an admission cam and one Exhaust cam, such four cams can control the opening and closing of four air valves respectively.The phase of two of them admission cam is consistent, To guarantee that two intake valves can open and close simultaneously, the phase of other two exhaust cam is also consistent, so two exhaust valves are also It opens and closes simultaneously.

Claims (5)

1. one kind can form the diesel valve mechanism of intake swirl, it is characterized in that: including the first camshaft, the second cam The first air inlet valve cam and first exhaust valve cam, setting first below the first air inlet valve cam are arranged on the first camshaft for axis First exhaust valve spring is arranged below first exhaust valve cam in inlet valve spring, below the first inlet valve spring setting first into Air valve, first exhaust valve spring lower section are arranged first row air valve, the second air inlet valve cam and second row are arranged on the second camshaft Air valve cam, the second air inlet valve cam lower section are arranged the second inlet valve spring, second exhaust are arranged below second exhaust valve cam Valve spring, the second inlet valve spring lower section are arranged the second intake valve, second row air valve are arranged below second exhaust valve spring.

2. one kind according to claim 1 can form the diesel valve mechanism of intake swirl, it is characterized in that: first into Air valve and the second intake valve are diagonally arranged, and first row air valve and second row air valve are diagonally arranged.

3. one kind according to claim 1 or 2 can form the diesel valve mechanism of intake swirl, it is characterized in that: the The phase of one air inlet valve cam and the second air inlet valve cam is consistent, the phase one of first exhaust valve cam and second exhaust valve cam It causes.

4. one kind according to claim 1 or 2 can form the diesel valve mechanism of intake swirl, it is characterized in that: the Angle is 150 ° ± 5 ° between one intake valve and the bottom surface and the second intake valve and the bottom surface of second row air valve of first row air valve.

5. one kind according to claim 3 can form the diesel valve mechanism of intake swirl, it is characterized in that: first into Angle is 150 ° ± 5 ° between air valve and the bottom surface and the second intake valve and the bottom surface of second row air valve of first row air valve.