CN104791110A

CN104791110A - Valve driving mechanism forming method with independently adjustable valve stroke and timing

Info

Publication number: CN104791110A
Application number: CN201510127679.5A
Authority: CN
Inventors: 朱譞晟
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-03-23
Filing date: 2015-03-23
Publication date: 2015-07-22

Abstract

The invention discloses a valve driving mechanism forming method with the independently adjustable valve stroke and timing. A variable valve stroke and timing mechanism is used, a variable valve stroke mechanism is additionally arranged, a crankshaft angle corresponding to a cam in the variable valve stroke and timing mechanism is amplified, then the valve stroke changes caused by the two mechanisms are amplified, and then the two mechanisms are connected in series randomly to jointly control a valve, namely the variable valve timing mechanism takes charge of the timing of the valve, and the variable valve stroke mechanism controls the stroke of the valve. After the variable valve timing mechanism changes the stroke of the valve, the variable valve stroke mechanism carries out adjustment again, and the timing and stroke of the valve both reach the expected values and are independently adjustable.

Description

The valve actuating mechanism constructive method of a kind of valve lift and timing Independent adjustable

Technical field

The present invention relates to the valve actuating mechanism constructive method of a kind of valve lift and timing Independent adjustable.

Background technique

Existing Variable Valve Time gear meaning is the overlapping angle changing intake valve and exhaust valve, and the endurance of valve opening is fixing.But this kind of valve timing mechanism is while the overlapping angle of raising, and exhaust valve postpones to open, intake valve is closed too early, all cause the exhaust loss that motor is extra, and cause air inflow to reduce, these all make output power best in internal combustion engine theory and moment of torsion incur loss.The method timing of valve can being adjusted to theoretical optimal value is called full Variable Valve Time, comprises timing and the overlapping angle of inlet and exhaust valve of single valve.

The effect of lift range variable is can the effect of Substitute For Partial closure, and the loss of engine pump gas is reduced, and throttle reaction velocity improves, and on petrol engine, effect obviously, but can not be used for diesel engine.

In the full Variable Valve Time method that open (bulletin) number: CN102235195A is combined by two kinds of variable air valve lift range mechanisms, indicate and change valve-opening time and do not change the method for valve lift, but its method defectiveness, the tandem of two kinds of mechanisms is not sufficient to the effect affecting mechanism in fact, just controlling method is different, and does not also only go out how to control valve lift.Moreover, if one of them mechanism make by reduce valve lift be adjusted to very little numerical value, 1/10th of such as maximum value, so another mechanism must make 10 times of compensation, this be difficult to realization, practicability has obstacle.

Open (bulletin) number: CN102235192A limits the full Variable Valve Time method defectiveness of lift, in fact need not the various stroke of enlarger and the valve lift that causes thereof, if with independent lift range variable technological incorporation, be responsible for controlling valve lift by the latter, just can realize the control of valve lift, constant or change valve lift.Moreover, only do not go out the proportionate relationship of concrete excision.The amplification lift that this method is pointed out namely expands the volume and weight of mechanism, and such combustion motor is very unfavorable.

These ideas comprehensive, can in the valve actuating mechanism constructive method of valve lift and timing Independent adjustable, and the deficiency of above two technology made up, advantage is merged.

Summary of the invention

This patent makes new solution for above-mentioned defect, needs a kind of new mechanism, realizes better controlling valve timing.The angle of cam is fixing, therefore needs a kind of mechanism can reduce the angle of cam, instead of amplifies the angle of cam, because cam angle degree can not be exaggerated, so must adopt the cam with the most wide in range crankshaft angles.

The method content that inventing provides comprises: the valve actuating mechanism constructive method of a kind of valve lift and timing Independent adjustable, the method uses two kinds of valve actuating mechanisms: a kind of continuous variable valve lift mechanism, its effect is the lift and the timing that continuously change valve, the now lift of valve and timing keeps the proportionate relationship that certain limit internal fixtion is constant, and claims this valve actuating mechanism to be A mechanism; Another kind of continuous variable valve lift mechanism, its effect is the lift continuously changing valve, does not change valve timing and claims this valve actuating mechanism to be B mechanism; First the crankshaft angles corresponding to cam is amplified, such as 360 degree, or according to the maximum magnitude of design; Then and amplify the change of the valve lift that A, B mechanism causes, the reduction of the valve lift that A mechanism is caused can major part be compensated by B; Then Liang Zhong mechanism to be cascaded the control jointly realized valve with order in no particular order, namely be responsible for by A mechanism the timing controlling valve, the i.e. time of valve duration unlatching, and by the lift of B mechanism controls valve, method is after A mechanism changes valve lift, adjusted again by B mechanism, make valve lift reach the numerical value of expection.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of method basic principle.Show the changeable air valve combined by two kinds of variable air valve lift range mechanisms and control effect.

Fig. 2 is the method schematic diagram of excision valve lift, is cut with specific form to driver part shape.

Embodiment

Illustrate below in conjunction with the valve actuating mechanism constructive method of accompanying drawing to a kind of valve lift and timing Independent adjustable.

As shown in Figure 1, the angle value of cam is lower so the crankshaft angles corresponding to cam is generally 220 to 240 degree because of rotating ratio in common internal-combustion engine.For adapting to the efficiency requirements during maximum speed of internal-combustion engine, the angle of cam must be increased to and adapt to high-revolving angle, more than 260 degree, reaches as high as 360 degree.In accompanying drawing shown in T0 is the continuously variable valve lift technology that can change valve timing, and it is while change valve lift, and valve timing, angle also extended to T1 from T0, extended to T2 from T1.If T0 to be defined as 180 degree, T2 can reach 360 degree, but lift also will reach two times of usual valve lift.The continuous variable valve lift mechanism not changing valve timing can reduce valve lift, is reduced to L2, is reduced to L1 from L2 from L0.Because the structure of two kinds of mechanisms in series, valve timing is regulated by A mechanism, B mechanism regulates valve lift, the result merged is exactly the final effect of valve as shown in drawings, in the final timing diagram of valve on the right of equal sign, the crankshaft angles being internal-combustion engine corresponding to the valve opening time in rotating speed minimum moment representated by T0, and be the crankshaft angles of internal-combustion engine corresponding to the valve opening time in the moment of moderate rotation representated by T1, the crankshaft angles being internal-combustion engine corresponding to the valve opening time in rotating speed the highest moment representated by T2.Crankshaft angles corresponding to T2, is not more than the crankshaft angles corresponding to angle value of cam.The visible regulating and compensating role due to B mechanism, the lift of T0 is the highest, is secondly T2, and that minimum is T1, because the compensation of the B mechanism suffered by T1 uses L1 minimum most, so lift is minimum.Therefore, total effect be as seen exactly the timing of valve and lift can independent regulation, mutually can not disturb, namely the timing angle of valve and lift range value can have arbitrary combination.

The CVTC of two types described here, does not refer in particular to some mechanisms, but all mechanisms meeting the feature of A, B definition.The combined mechanism of two kinds of mechanisms, not Shi Shierzhong mechanism is completely independent, is also merged depending on concrete condition, the complexity of mechanism is reduced.

Because the control mechanism of A, B mechanism is separated, whole mechanism therefore can be made to have two adjustable parameters, and this is the Fundamentals of Mathematics making valve timing and lift Independent adjustable.

So-called series connection, the output terminal of previous exactly mechanism is connected to the input end of a rear mechanism, and the input end of previous mechanism is exactly cam, and the output terminal of a rear mechanism is exactly valve.

If the lift of A mechanism and valve duration opening angle all too small, the ratio that the lift of so carrying out needed for B mechanism compensates is excessive, cause leverage very large, the pressure that parts are born is very high, therefore when lift needed for valve is lower than a ratio, described A mechanism no longer carries out regulating and fixing, and after this valve lift is determined by B mechanism completely; The numerical value of this ratio is the required valve duration opening angle of internal-combustion engine minimum full power rotating speed and the ratio of the angle of maximum full power rotating speed.The reason done so is also, A mechanism is only responsible for regulating engine valve to continue opening angle angle value, and not responsible valve lift, that is, the existence of B mechanism relieves the responsibility that A mechanism regulates valve lift, and is born by B mechanism.For example, the valve duration opening angle angle value of internal-combustion engine is between 200 degree to 300 crank angle, so the scope of the lift that the timing of A mechanism is corresponding is exactly 1 to 1.5, or 0.666 to 1, the timing of oneself can not be transferred to lower than 200 crank angle by A mechanism, lift is also not less than 1 or 0.666, and the valve lift lower than this numerical value is regulated by B mechanism.

The DESIGNED FEATURE of A mechanism can have influence on B mechanism, and the reduction of lift variation to the design difficulty of B mechanism managing to reduce A mechanism is highly beneficial.So A mechanism adopts cut sharp method to revise the design of Variable Valve Time and lift mechanisms.Illustrate that this cuts the concrete grammar of sharp method with an embodiment:

Suppose that the valve duration opening angle angle value of internal-combustion engine is between 200 degree to 300 crank angle again, so the scope of the lift that the timing of A mechanism is corresponding is exactly 1 to 1.5, or 0.666 to 1, suppose that valve duration opening angle angle value becomes exact linear relationship with valve lift, so minimum and maximum valve duration opening angle angle value proportionate relationship is exactly 2: 3, if by A mechanism maximum lift excision 1-2/3=1/3, so just can ensure that A mechanism valve lift when adjusting valve duration opening angle angle value is substantially constant, therefore the adjustment made of B mechanism is also very little, be conducive to reducing the wastage.The shape of the mechanical part causing valve lift to raise is cut away by excision concrete exactly, allows mechanism do the action keeping valve lift when moving to here.Excision is not recommended to cut away too much yet, because excision is too many, the speed of valve opening and closedown is too high, this elastic force to valve spring requires high, elastic force is high must cause more losses, therefore does compromise process according to actual conditions, and suitably some valve lifts of excision are just passable.

For the mechanism shown in Fig. 2, the method of excision is described, shape shown by Fig. 2 (1), it is the essential element of all lift range variables and timing mechanism---swing arm---and the general shape of surface of contact of roller rock arm driving valve, triangle outstanding downwards refers to valve and opens required geometrical shape, triangle base contour, is the shape keeping valve-closing; The height of lift is directly proportional to the height of denation.Correct cutting method is Fig. 2 (2), the top part that excision triangle is outstanding, and ratio is exactly the height of denation.Fig. 2 (3) is the excision method of mistake, and do like this and valve lift can be caused not enough, root is the proportionate relationship changed between valve lift and timing.

Claims

1. a valve actuating mechanism constructive method for valve lift and timing Independent adjustable, the method uses two kinds of valve actuating mechanisms:

A kind of continuous variable valve lift mechanism, its effect is the lift and the timing that continuously change valve, now the lift of valve and the constant proportionate relationship of timing maintenance certain limit internal fixtion, and claims this valve actuating mechanism to be A mechanism;

Another kind of continuous variable valve lift mechanism, its effect is the lift continuously changing valve, does not change valve timing and claims this valve actuating mechanism to be B mechanism;

First the crankshaft angles corresponding to cam is amplified, such as 360 degree, or according to the maximum magnitude of design; Then and amplify the change of the valve lift that A, B mechanism causes, the reduction of the valve lift that A mechanism is caused can major part be compensated by B; Then Liang Zhong mechanism to be cascaded the control jointly realized valve with order in no particular order, namely be responsible for by A mechanism the timing controlling valve, the i.e. time of valve duration unlatching, and by the lift of B mechanism controls valve, method is after A mechanism changes valve lift, adjusted again by B mechanism, make valve lift reach the numerical value of expection;

Further, the parts of A mechanism make some excisions, reduce the change of the valve lift that it causes; The part of excision and the ratio of prior partial are according to following formula: the maximum unlatching crankshaft angles of the minimum lasting unlatching crankshaft angles/valve of cut-out≤1-valve.

2. the valve actuating mechanism constructive method of a kind of valve lift and timing Independent adjustable as claimed in claim 1, be further characterized in that when lift needed for valve is lower than a ratio, described A mechanism no longer carries out regulating and fixing, and after this valve lift is determined by B mechanism completely; The numerical value of this ratio is the required valve duration opening angle of internal-combustion engine minimum full power rotating speed and the ratio of the angle of maximum full power rotating speed.