CN105378236A - Method for optimizing response time of hydraulic latch-pin in cylinder deactivation rocker arm - Google Patents

Abstract

A method for optimizing response time of a latch in a cylinder deactivation rocker arm assembly is provided. The latch is configured to move between an engaged position with an inner arm of the rocker arm assembly and a retracted position. A major outer diameter (L1) of the latch is determined. An installed length (L2) of a spring biasing the latch is determined. A clearance (L3) between L1 and a major inner diameter of an outer arm of the rocker arm assembly is determined. A radial clearance (L4) between a cage coupled to the outer arm and a major inner diameter of the latch is determined. A minor diameter (L5) of the latch is determined. A relationship between the response time of the latch and L1, L2, L3, L4 and L5 is established. Components of the cylinder deactivation rocker arm assembly are selected based on the relationship.

Description

For optimizing the method for the response time of the hydraulic lock rod bolt in cylinder deactivation rocking arm

The intersection of related application is quoted

This application claims the U.S. Provisional Patent Application No.61/872 submitted on August 30th, 2013,621, the U.S. Provisional Patent Application No.61/872 submitted on August 30th, 2013, the U.S. Provisional Patent Application No.61/898 that on November 1st, 624 and 2013 submits to, the rights and interests of 475.The disclosure of above-mentioned application is incorporated to herein by reference.

Technical field

The present invention relates generally to conversion roller type finger-type driven member, relating more specifically to the method for the response time of the latch pin for optimizing cylinder deactivation rocking arm.

Background technique

Allow the conversion roller type finger-type driven member or the conversion rocking arm that are controlled valve actuation by conversion between two or more states, be usually directed to multiple arm, as inner arm and outer arm.Conversion rocking arm can use the fuel economy improving motor in variable valve actuation (VVA) system.

The description of background technique provided herein is to totally present background of the present invention.With regard to described by this background parts and otherwise also not yet obtain in this meaning of the All aspects of of the description as prior art qualification when submitting to, the work of the inventor of current signature is neither expressed and is not also impliedly admitted for relative to prior art of the present invention.

Summary of the invention

Provide a kind of method of response time for optimizing the lock bolt in cylinder deactivation rocker arm assembly.Move between the position of the inner arm joint of described bolt structure Cheng Yu rocker arm assembly and retracted position.Determine the main external diameter/large footpath (L1) of described lock bolt.Determine the length of installation (L2) of the spring of lock bolt described in bias voltage.Determine the gap (L3) between the main internal diameter of the outer arm of L1 and rocker arm assembly.Determine be attached to the radial clearance (L4) of shrouding between the main internal diameter of lock bolt of outer arm.Determine the path (L5) of lock bolt.Set up the response time of described lock bolt and the relation between L1, L2, L3, L4 and L5.The impact of at least one in L1, L2, L3, L4 and L5 on the response time is greater than other each in L1, L2, L3, L4 and L5.The parts of cylinder deactivation rocker arm assembly are selected based on described relation.

Can to be lock bolt from inner arm move and made it possible to ON response time of being transformed into needed for deactivation mode response time.In an example, L4 is larger than L1, L2 and L3 impact on the response time.In another example, L5 is larger than L1, L2 and L3 impact on the response time.In one example, described relation is set up by equation below:

ON response time (ms)=22.1431+1.2675*L1 – 1.28*L2 – 0.2625*L3 – 8.8762*L4+8.1951*L5+0.55*L1*L2 – 2.825*L1*L4 – 2.77*L1*L5+0.655*L2*L4 – 0.6050*L2*L5 – 0.4875*L3*L4 – 4.035*L4*L5.

In another example, the response time is that lock bolt moves to the OFF response time needed for engagement positio from retracted position.L1 can be larger than L2, L3, L4 and L5 impact on the response time.L4 can be larger than L2, L3 and L5 impact on the response time.L5 can be larger than the impact of L2 and L3 on the response time.In an example, described relation is set up by equation below:

OFF response time (ms)=19.731+15.8987*L1+1.17163*L2 – 1.53*L3 – 7.6401*L4 – 4.405*L5+1.3375*L1*L2 – 10.265*L1*L4 – 1.837*L1*L5 – 1.005*L2*L5+1.7875*L4*L5.

Provide the method for ON and the OFF response time for optimizing the lock bolt in cylinder deactivation rocker arm assembly according to another example of the present invention.Lock bolt moves between the position engaged with the inner arm of rocker arm assembly and retracted position.The method comprises the main external diameter (L1) determining lock bolt.Determine the length of installation (L2) of the spring of bias voltage lock bolt.Gap (L3) between the main internal diameter determining the outer arm of the rocking arm of L1 and rocker arm assembly.Determine the radial clearance (L4) of shrouding between the main internal diameter of lock bolt being attached to outer arm.Determine the path (L5) of lock bolt.Set up the relation between the response time of lock bolt and L1, L2, L3, L4 and L5.Each in L1, L2 and L5 all has reverse/reverse relation about ON response time and OFF response time.The parts of cylinder deactivation rocker arm assembly are selected based on set up relation.

According to further feature, lock bolt moves from inner arm and makes it possible to be transformed into deactivation mode needs the ON response time.L4 can be larger than L1, L2 and L3 impact on the response time.L5 can be larger than L1, L2 and L3 impact on the response time.L5 can be larger than L1, L2 and L3 impact on the response time.In an example, the ON response time is set up by equation below:

ON response time (ms)=22.1431+1.2675*L1 – 1.28*L2 – 0.2625*L3 – 8.8762*L4+8.1951*L5+0.55*L1*L2 – 2.825*L1*L4 – 2.77*L1*L5+0.655*L2*L4 – 0.6050*L2*L5 – 0.4875*L3*L4 – 4.035*L4*L5.

According to additional example, lock bolt moves to engagement positio from retracted position needs the OFF response time.L1 can be larger than L2, L3, L4 and L5 impact on the response time.L4 can be larger than L2, L3 and L5 impact on the response time.L5 can be larger than the impact of L2 and L3 on the response time.In an example, the OFF response time is set up by equation below:

OFF response time (ms)=19.731+15.8987*L1+1.17163*L2 – 1.53*L3 – 7.6401*L4 – 4.405*L5+1.3375*L1*L2 – 10.265*L1*L4 – 1.837*L1*L5 – 1.005*L2*L5+1.7875*L4*L5.

Accompanying drawing explanation

The present invention can from detailed description and drawings comprehend, in the accompanying drawings:

Fig. 1 is the front perspective view of the exemplary transformation rocking arm according to an example of the present invention structure;

Fig. 2 is the partial sectional view of the switching mechanism of the conversion rocking arm of Fig. 1, and shows valve and be in Lifting scheme, and lock bolt is engaged;

Fig. 3 is the partial sectional view of the conversion rocking arm of Fig. 2, and shows valve and be in deactivation mode, and lock bolt departs from;

Fig. 4 is the partial sectional view of the conversion rocking arm of Fig. 1, and shows lock bolt and engage with inner arm;

Fig. 5 is the partial sectional view of the conversion rocking arm of Fig. 1, and shows lock bolt and be in retracted position and contact with shrouding;

Fig. 6 A is the partial sectional view of conversion rocking arm, shows lock bolt and moves to retracted position from engagement positio;

Fig. 6 B is the end elevation with lock bolt that shrouds of the conversion rocking arm of Fig. 6 A;

Fig. 7 is lock bolt to the free-body diagram shrouded in moving process;

Fig. 8 is lock bolt away from the free-body diagram shrouded in moving process;

Fig. 9 A is the partial sectional view of the conversion rocking arm of Fig. 1 according to exemplary baseline design;

Fig. 9 B is the sectional view that Fig. 9 A intercepts along A-A line;

Figure 10 A is the partial sectional view of conversion rocking arm of Fig. 9 A according to exemplary optimized design;

Figure 10 B is the sectional view that Figure 10 A intercepts along A-A line;

Figure 11 is the plotted curve of the effect of the diametric clearance (L3) represented between lock bolt and outer arm;

Figure 12 represents lock bolt and the plotted curve of the effect of radial clearance (L4) between shrouding; With

Figure 13 is the plotted curve of the effect of the contact length (L6) represented between lock bolt and outer arm.

Embodiment

Below instruct for the method for the lock bolt response time in transformation rocking arm.Particularly, discussion below provides and optimizes the lock bolt response time or lock bolt moves to make to change rocking arm can be transformed into the time (vice versa) of deactivated mode method from Lifting scheme.

First with reference to Fig. 1, show exemplary transformation roller type finger-type driven member (SRFF) assembly according to an example of the present invention structure, and total be denoted as reference number 10.SRFF assembly 10 can be that compact cam-actuated single salient angle/protuberance cylinder deactivation (CDA) changes rocking arm 12, it is arranged on the internal-combustion engine of piston actuated, and is activated by the combination of double-fed type hydraulic lash adjuster (DFHLA) 14 and oil control valve (OCV) 16.SRFF assembly 10 engages by single salient angle cam 20.Conversion rocking arm 12 can comprise inner arm 22, outer arm 24.Default configuration is in normal hoisting (locking) position, together with wherein inner arm 22 is locked in outer arm 24, causes engine valve 26 to open and allows cylinder to run in the mode of standard valve mechanism.DFHLA14 has two hydraulic fluid ports.Lower hydraulic fluid port or backlash compensation pressure port 28 provide backlash compensation and are supplied to the machine oil being similar to standard HLA.Upper hydraulic fluid port 30---is called switching to pressure mouth---and provides from the pipeline (Fig. 2) between the controlled oil pressure of OCV16 and lock bolt 32.When lock bolt 32 is engaged, inner arm 22 and the same co-operate of the accurate rocking arm of outer arm 24 image scale are to open engine valve 26.When non-lifting (unblock) position, inner arm 22 and outer arm 24 can independently move that cylinder is closed down.

Continue, with reference to Fig. 1 and additional reference Fig. 2, to describe the additional feature of SRFF assembly 10.A pair empty dynamic torque spring 40 is combined with the position of bias voltage inner arm 22, makes it remain and camshaft lobe 20 continuous contact.Torque spring 40 is fixed to by spring retainer 44 on the bearing that is positioned on outer arm 24.Empty dynamic torque spring 40 needs than using the higher preload of the design of many salient angles to contribute to camshaft lobe 20 and inner arm roller bearing 50 continuous contact.Engine valve 26 can comprise valve seat 54 and valve guiding element 56.Valve spring 58 can be biased into valve seat 54 away from outer arm 24.

OHV16 can be electronic control ON/OFF (ON/OFF) valve, and it receives electrical signal from control unit of engine (ECU) 70.Machine oil is supplied to OCV16.As mentioned above, OCV16 is hydraulically connected to DFHLA14.Inner arm 22 is pivotally attached to outer arm 24 at pivot 76 place.Connection at pivot 76 place allows inner arm 22 to swing relative to outer arm 24.Lock bolt 32 is arranged on the end pivot side of outer arm 24, the top of DFHLA14, its objective is and provides the secondary between inner arm 22 with outer arm 24 to be connected.Lock bolt Compress Spring 80 is engaging the expanding location bias voltage lock bolt 32 of inner arm 22.One end of lock bolt Compress Spring 80 is caught by lock bolt 32 and the other end 82 to be caught by shrouding of permanent link outer arm 24.Sky spring 40 of moving makes camshaft lobe 20 keep permanent contact to be arranged in the roller bearing 50 of inner arm 22.Oil pressure in switching to pressure mouth and the balance between the power of lock bolt Compress Spring 80 promote lock bolt 32 to make inner arm 22 engage with outer arm 24 or to depart from.

The exemplary mode of operation of cylinder deactivation will be described.Lifting scheme can occur under engine speed is up to 7200rpm and all working temperature.When not having electrical signal to arrive OCV16, the oil pressure of conversion mouth can be adjusted to 0.2 bar (bar) to 0.4 bar.Lock bolt 32 is in extended position and engages with inner arm 22.Cylinder deactivation or non-Lifting scheme can be available when engine speed is 20 degrees Celsius or more up to 3500rpm and oil temperature.Non-Lifting scheme is triggered by the electrical signal from ECY70 to OCV16, and this makes the oil pressure of switching to pressure mouth increase in 2.0 Palestine and Israels.The increase of pressure makes lock bolt 32 retract to depart from inner arm 22.In an example, the oil pressure under 20 degrees Celsius is in 4.0 Palestine and Israels.In addition, be feasible at the temperature of 2.0 bar oil pressure more than 100 degrees Celsius.Consequently, the oil pressure under low temperature can be 3 bar.

Now concrete with reference to Fig. 2, the cross section of SRFF assembly 10 in Lifting scheme process will be described.When not having electrical signal to arrive OCV16, the oil pressure of switching to pressure mouth is that 0.2 bar to 0.4 clings to.Lock bolt 32 stretches out and engages with inner arm 22.SRFF assembly 10 inner arm 22 and outer arm 24 are working as the single main body being similar to standard rocking arm of linking together.Camshaft rotary motion is delivered to valve 26 by inner arm 22 and outer arm 24.Valve 26 opens and closes based on the lifting profile of camshaft lifts salient angle 20.

Now concrete with reference to Fig. 3, the cross section of SRFF assembly 10 in non-Lifting scheme process will be described.Electrical signal from ECU70 encourages OCV16 to be pressurizeed to conversion mouth by engine oil pressure.In one configuration, need at least 2.0 bar overcome lock pin spring 80 preload force, compress described lock pin spring 80 and mobile be in retracted position lock bolt 32, inner arm 22 and outer arm 24 are departed from.SRFF assembly 10 can comprise gap between lock bolt 32 and inner arm 22, be called lock bolt gap.This gap allows lock bolt 32 based on the oil pressure in conversion mouth and moves turnover outer arm 24 when camshaft is on basic circle.Lacking between lock bolt 32 with inner arm 22 to be connected causes camshaft rotary motion only to transfer to pivotally 76 inner arms rotated 22.Camshaft motion can not be delivered to and keep static valve 26 on valve seat 54.

CDA changes rocking arm 12 and makes it possible to be transformed into deactivated mode from Lifting scheme, and vice versa.Dual overhead cam engines has an OCV16, and it provides input to four SRFF assemblies 10 (two for intake valve and two for exhaust valve).To activate and the order of described valve of closing down is important for the normal work of motor.The preferred sequence being transformed into close down (pattern) from Lifting scheme is the connection of SRFF and exhaust valve of first closing down, and makes waste gas be trapped in cylinder, then, and the connection of close down SRFF and intake valve.When changing from closing down to Lifting scheme, first exhaust valve is activated to release and carrys out to keep in comfortable periodic process of closing down the pressure of entrap gas in the cylinder.Then, SRFF is activated to the connection of intake valve, allows intake valve to open at pressures close to atmospheric pressure.The waste gas be trapped in cylinder in periodic process of closing down is useful, because which reduce pumping loss and keep cylinder deactivation not cool, maintains the thermal efficiency of motor.The order that conversion between pattern needs to enclose interior generation and conversion air inlet and exhaust at cam axle one is important and must keeps the normal work for motor.One of SRFF exceedes and may cause conversion time with the sequence of mistake conversion SRFF.

The window that can be used for changing is defined as hydraulic pressure and can changes pattern and can complete lock bolt mechanical motion to produce the time of the change (vice versa) from closing down to activating.Under patten transformation occurs in the state that SRFF is on camshaft basic circle, when under the load that lock bolt 32 is in from inner arm 22 and when can move freely.

The lock bolt response time is defined for lock bolt 32 and moves to make SRFF can transfer to the time of deactivated mode (vice versa) from Lifting scheme.Lock bolt 32 moves from inner arm 22 and the SRFF time be transformed into needed for deactivated mode can be made to be called " ON response ".The motion of lock bolt 32 is realized by excitation OCV16.This makes the pressure increase of switching to pressure mouth to engine oil pressure.The increase of this pressure overcomes the power of lock bolt snap 80, makes lock bolt 32 move to retracted position from engagement positio.

Turn to Fig. 4 now, lock bolt 32 is illustrated in engagement positio.When the front surface of lock bolt 32 contacts with inner arm 22, lock bolt 32 is in engagement positio.The oil pressure of switching to pressure mouth increases makes lock bolt 32 move distance D1 from engagement positio to retracted position.Distance D1 can be 1.86mm in the example shown.

Referring now to Fig. 5, lock bolt 32 is illustrated in retracted position.At retracted position, lock bolt 32 with shroud 82 and contact.Completely inner at the outer arm 24 and connection between inner arm 22 and lock bolt 32 of lock bolt 32 is stopped.Inner arm 22 keeps free pivotable in the cycle of closing down.When not having signal to be sent to OCV16, OCV16 is de-energized.Oil pressure in switching to pressure mouth is adjusted to 0.2 bar to 0.4 bar.This underpressure, to overcome by the spring force compressed, makes lock bolt 32 move to extended position.Lock bolt 32 is referred to herein as " OFF response " from retracted position to the traveling time of part engagement positio.

Referring now to Fig. 6 A and 6B, illustrate that lock bolt 32 runs from engagement positio to retracted position.Fig. 6 A shows the section of the axis of advancing along lock bolt.Fig. 6 B shows the section of the plane by the moving direction perpendicular to lock bolt.If oil does not leave SRFF fast by being arranged in the hole shrouded when lock bolt 32 moves to disengaging configuration, the lock bolt in bag and shroud oil resident between 82 and produce back pressure.Draining path 100 is formed at lock bolt 32 and between shrouding 82.Draining path 100 contributes to reducing the ON response time.As described herein, the design of lock bolt 32 with the interface shrouding 82 is changed for reducing the ON response time.

Fig. 7 illustrates that lock bolt 32 is towards the free-body diagram shrouded in 82 movement processes.The power of latch movement is driven to be hydraulic coupling because lock bolt closed end place produces towards the pressure from OCV16 of main external diameter, F _pa1.The power contrary with latch movement is the viscous friction power because the fluid between lock bolt 32 and outer arm 24 produces, F _viscous1and F _viscous2, lock pin spring compressive force F _spring, lock bolt closed end place is towards the hydraulic coupling F of path _pa2, and act on the hydraulic coupling F lock bolt 32 from open end _pa3.Latch displacement x is derived in following equation by Newton interpolation algorithm, and wherein m is latch mass:

$m\·\frac{d^{2}x}{{\mathrm{dt}}^2}=F_{pa1}-F_{pa2}-F_{pa3}-F_{viscous1}-F_{viscous2}-F_{spring}$

When OCV16 is de-energized, the oil pressure of conversion mouth drops to maximum 0.4 bar.Underpressure to overcome by the power of the spring compressed, allow lock bolt from lock bolt 32 with shroud 82 retracted positions contacted and move away from and shroud 82.Fig. 8 illustrates the free-body diagram of lock bolt 32 in this movement process, and wherein, the power driving latch movement is lock pin spring preload force F _spring, lock bolt closed end place is towards the hydraulic coupling F of little OD _pa2with the hydraulic coupling F acted on from open end on lock bolt 32 _pa3.The power contrary with latch movement is the fluid viscous frictional force F on lock bolt full diameter and path _viscous1and F _viscous2, and owing to changing the hydraulic coupling F of the oil pressure generation in mouth _pa1.The lock bolt of deriving from Newton's second law represents with equation below away from the motion shrouding 82, and wherein x represents the quality that displacement and m represent lock bolt 32:

$m\·\frac{d^{2}x}{{\mathrm{dt}}^2}=F_{spring}-F_{pa1}+F_{pa2}+F_{pa3}-F_{viscous1}-F_{viscous2}$

Method according to the present invention determines the various parameters affecting the response time.Fig. 9 A and 10A shows the section by SRFF12 on latch movement direction, for baseline design (Fig. 9 A) and optimal design (Figure 10 A).Fig. 9 B and 10B illustrates the respective section perpendicular to latch movement axis, and wherein lock bolt 32 is between engagement positio and retracted position.Parameter is below determined.The main external diameter of lock bolt (OD) L1, the length of installation L2 of spring 80.Gap L 3 between lock bolt main external diameter OD and outer arm 24 hole main internal diameter (ID).Lock bolt 32 is to the radial clearance L4 shrouding 82.The little ODL5 of lock bolt 32.Lock bolt 32 is to the contact length L6 of outer arm 24.Lock bolt 32 and the volume L7 shrouded between 82.Fluid to the outlet effusion shrouding 82, is exposed to cylinder head by radial clearance L4 from lock bolt open end.

Will now describe the impact according to the lock bolt of this instruction main OD, L1.The ON response time reduces, because cause hydraulic coupling F along with the increase of lock bolt main OD, L1 _pa1pressure can area increase.The OFF response time increases along with diameter and increases, because higher action of hydraulic force is on lock bolt main OD, L1.The process that lock bolt moves from disengaging configuration to engagement positio, maximum 0.4 bar of available back pressure in switching to pressure mouth.In addition, the speed changing the pressure drop in mouth also works to OFF response.Initial tension of spring effectively promotes latch movement after only dropping to pressure minimum under stress.Therefore, before dropping to pressure minimum under stress, OCV and lock bolt and the interactional Accurate Prediction dynamically responded for OFF of fluid path are important.Due to the interaction in lock bolt front portion/front, the impact being dynamically subject to lock bolt full diameter of OCV.

Will now describe the impact of the spring fitting length L2 according to this instruction.The load variations of spring changes with L2.Length of installation L2 affects spring preload power.The length of installation of spring is larger, and spring force is less.ON response declines along with the increase of length of installation, because lower at the resistance provided by spring in the process of disengaging configuration movement from engagement positio.OFF response declines along with the reduction of spring fitting length because the preload in spring is comparatively large, this preload from disengaging configuration in engagement positio moving process as driving force.

With reference to Figure 11, the impact according to the diametric clearance L3 of this instruction will be described.Gap L 3 between lock bolt main OD, L1 and the main ID of outer arm affects the viscous friction F between the main OD of lock bolt and the main ID of outer arm _viscous1.The increase in the gap between lock bolt main OD, L1 and the main ID of outer arm responds ON and OFF and has an impact.OFF response increases along with diametric clearance L3 and reduces, because the flow that lock bolt open end place increases adds pressure F _pa3.ON response reduces until gap reaches intended distance, such as 0.12mm.Response time increases subsequently.In this respect, the gap increased to up to 0.12mm reduces viscous friction power and thus ON response decline.When exceeding 0.12mm, leak very high, the hydraulic coupling therefore acted on lock bolt main OD, L1 is very low, thus causes the ON increased to respond.

With reference to Figure 12, will now describe the impact of the radial clearance L4 according to this instruction.Latch movement from engagement positio to retracted position makes oil dispersion at volume chamber L7.Leakage flow from diametric clearance L3, by chamber volume L7 and through leaving SRFF after radial clearance L4.Figure 12 shows and shrouds radial clearance between 82 and the main ID of lock bolt to the impact of ON and OFF response time.The ON response time increases along with radial clearance and reduces, because the contrary power F caused due to the pressure produced at cavity volume L7 _pa3less.Along with gap increases, the pressure drop in cavity volume L7, because fluid is exposed to barometric pressure rapidly by the opening shrouded in 82.OFF response is followed similar physical in the latch movement of return stroke process.Compared with the response that OFF responds responds with ON, slope is steeper.

Will now describe the impact of the lock bolt path L5 according to this instruction.ON response increases along with lock bolt path L5 and increases, because hydraulic coupling F _pa2the F of resistance is provided with the retraction movement for lock bolt 32 _pa1compare and relatively increase.OFF response increases along with path and reduces, because act on the spring force F of equidirectional _springwith hydraulic coupling F _pa2combined effect.

In addition with reference to Figure 13, will now describe the impact of the contact length L6 according to this instruction.Contact length L6 between lock bolt 32 and outer arm 24 increases and has no significant effect ON and the OFF response time.Figure 13 shows the coherence of contact length L6 to the response time.The increase of contact length makes frictional force increase.Compared to other parameter, the change of contact length L6 and chamber volume L7 parameter does not affect the response time.

According to method of the present invention, provide the quantitative transfer function of the relation between the governing factor exporting response that has an impact.Five governing factors have impact to the response time: the main OD of lock bolt (L1), spring fitting length (L2), diametric clearance (L3), radial clearance (L4) and the little ID of lock bolt (L5).Transfer function draws from the Output rusults analyzing ON and the OFF response time.The impact of described factor is directly proportional to the amplitude of correlation coefficient.The amplitude of coefficient is higher, and the change of response is stronger.Following equation central diameter respectively illustrates powerful impact and the contribution of (-40%) and (+37%) to the coefficient of gap (L4) and the little OD of lock bolt (L5).This demonstrating the level 1 that radial clearance (L4) moved to dimensionless number and making other factors remain on level 0 causes the ON response time to reduce by 40.0% or about 9ms.Higher levels of interaction has insignificant impact.Obtain the transfer function ON and OFF response shown in following equation that are used for dimensionless number " 0 " and "+1 ":

ON responds (ms)=22.1431+1.2675*L1 – 1.28*L2 – 0.2625*L3 – 8.8762*L4+8.1951*L5+0.55*L1*L2 – 2.825*L1*L4 – 2.77*L1*L5+0.655*L2*L4 – 0.6050*L2*L5 – 0.4875*L3*L4 – 4.035*L4*L5

The coefficient of the main OD of lock bolt (L1) in OFF response time equation (below), radial clearance (L4) and the little OD of lock bolt (L5) shows the higher contribution being respectively+81.0% ,-39.0% and-22.0%.This shows, the level 2 making the main OD of lock bolt (L1) move to dimensionless number makes OFF respond and adds about 16ms.Transfer function to outgoing direction with the level 1 making radial clearance (L4) and the little OD of lock bolt (L5) move to dimensionless number, to reduce the OFF response time.The larger contribution of the interaction coefficient display 52.0% of L1 and L4, and indicate that reducing OFF responds, the main OD of lock bolt (L1) can move to the level 1 of dimensionless number together with factor lock bolt radial clearance L4.Remaining higher levels of interaction has insignificant impact.

OFF responds (ms)=19.731+15.8987*L1+1.17163*L2 – 1.53*L3 – 7.6401*L4 – 4.405*L5+1.3375*L1*L2 – 10.265*L1*L4 – 1.837*L1*L5 – 1.005*L2*L5+1.7875*L4*L5

The main OD of lock bolt (L1), spring fitting length (L2), the little OD of lock bolt (L5) become inverse relationship relative to ON with the OFF response time.Developing response optimization device function for understanding the impact of different tests setting on ON and the OFF response time, its object is to the sensitivity exploring ON and OFF response when input variable changes.The combination that the best of generation the shortest ON and the OFF response time of this function determination input variable, L1 to L5 is possible.Optimization aim farthest reduces two response times and selects the arbitrary target of 12.0ms to provide sane design variant.Two transfer functions that discovery had previously drawn, the best of breed of design variable are farthest synchronously to reduce ON and OFF response.For best ON and the OFF response time make optimization after following ideal dimensions is provided.Lock bolt full diameter L1=7.947mm, spring fitting length L2=7.126mm, the gap L 3=0.103mm between the main OD of lock bolt and outer arm aperture, lock bolt is to the radial clearance L4=0.400mm shrouded and the little ODL5=5.741 of lock bolt.L2, L3 and L4 are moved to level 1 design method set forth herein and L1 and L5 moves to level 0.

Figure 10 A and 10B shows the design of optimization, wherein with the similar reference number of suffix " A " for representing similar parts.Optimal design comprises change lock bolt 32A, shrouds 82A and spring fitting length L2 to reduce the response time and to balance ON and OFF response.Find the optimal value of factor L1 to L5.The consideration of packaging limits the change of the main OD of lock bolt (L1) and lock bolt path (L5).Change in design below having carried out: L2 reduces 3.87% to balance ON/OFF response.L3 increases 44% to reduce viscous friction in latch movement process and to reduce by two response times.L4 increases 53%.Optimal design have modified shrouds little OD and increases lock bolt ID.In addition, as will be appreciated, ON and the OFF response time equation provided by method of the present invention can be used when selecting the parts of SRFF assembly 10.

The application shown in the drawings of multiple different embodiment of the present invention.Similar feature has been shown in different embodiments of the invention.Similar feature is carried out label by common reference number and is distinguished by letter suffix.In addition, in order to improve conformity, the structure in any certain figures shares identical letter suffix, even if special characteristic does not illustrate in all embodiments.Similar feature can construct similarly, operate similarly, and/or has identical function, unless separately added explanation by accompanying drawing or this specification.In addition, the special characteristic of an embodiment can replace characteristic of correspondence in another embodiment, also can supplement other embodiment, unless separately added explanation by accompanying drawing or this specification.

The aforementioned explanation of embodiment is provided to illustrate and describe.Be not intended to exhaustive or restriction the present invention.The individual element of specific embodiment or feature are not limited to this specific embodiment usually, but can exchange at where applicable, and can use in selected embodiment, even without specifically illustrating or describing.Equally also can change in many aspects.Such change should not be regarded as a departure from the present invention, and all this amendments are intended to be included within the scope of the invention.

Claims (20)

1., for optimizing the method for the response time of the lock bolt in cylinder deactivation rocker arm assembly, described lock bolt moves between the position engaged with the inner arm of rocker arm assembly and retracted position, and the method comprises:

Determine the main external diameter (L1) of described lock bolt;

Determine the length of installation (L2) of the spring of lock bolt described in bias voltage;

Determine the gap (L3) between the main internal diameter of the outer arm of L1 and rocker arm assembly;

Determine be attached to the radial clearance (L4) of shrouding between the main internal diameter of lock bolt of outer arm;

Determine the path (L5) of lock bolt;

Set up the response time of described lock bolt and the relation between L1, L2, L3, L4 and L5, wherein, the impact of at least one in L1, L2, L3, L4 and L5 on the response time is greater than all the other each in L1, L2, L3, L4 and L5; With

The parts of cylinder deactivation rocker arm assembly are selected based on described relation.

2. method according to claim 1, wherein, to be lock bolt from inner arm moved and made it possible to ON response time of being transformed into needed for deactivation mode the described response time.

3. method according to claim 2, wherein, L4 is larger than L1, L2 and L3 impact on the response time.

4. method according to claim 3, wherein, L5 is larger than L1, L2 and L3 impact on the response time.

5. method according to claim 4, wherein, described relation comprises:

ON response time (ms)=22.1431+1.2675*L1 – 1.28*L2 – 0.2625*L3 – 8.8762*L4+8.1951*L5+0.55*L1*L2 – 2.825*L1*L4 – 2.77*L1*L5+0.655*L2*L4 – 0.6050*L2*L5 – 0.4875*L3*L4 – 4.035*L4*L5.

6. method according to claim 1, wherein, the described response time is that lock bolt moves to the OFF response time needed for engagement positio from retracted position.

7. method according to claim 6, wherein, L1 is larger than L2, L3, L4 and L5 impact on the response time.

8. method according to claim 7, wherein, L4 is larger than L2, L3 and L5 impact on the response time.

9. method according to claim 8, wherein, L5 is larger than the impact of L2 and L3 on the response time.

10. method according to claim 9, wherein, described relation comprises:

OFF response time (ms)=19.731+15.8987*L1+1.17163*L2 – 1.53*L3 – 7.6401*L4 – 4.405*L5+1.3375*L1*L2 – 10.265*L1*L4 – 1.837*L1*L5 – 1.005*L2*L5+1.7875*L4*L5.

11. 1 kinds for optimizing the method for ON and the OFF response time of the lock bolt in cylinder deactivation rocker arm assembly, described lock bolt moves between the position engaged with the inner arm of rocker arm assembly and retracted position, and the method comprises:

Determine the main external diameter (L1) of lock bolt;

Determine the length of installation (L2) of the spring of bias voltage lock bolt;

Gap (L3) between the main internal diameter determining the outer arm of L1 and rocker arm assembly;

Determine the radial clearance (L4) of shrouding between the main internal diameter of lock bolt being attached to outer arm;

Determine the path (L5) of lock bolt;

Set up the relation between the response time of lock bolt and L1, L2, L3, L4 and L5, wherein, each in L1, L2 and L5 all has the inverse relationship about ON response time and OFF response time; With

The parts of cylinder deactivation rocker arm assembly are selected based on set up relation.

12. methods according to claim 11, wherein, described lock bolt moves from inner arm and makes it possible to be transformed into deactivation mode needs the described ON response time.

13. methods according to claim 12, wherein, L4 is larger than L1, L2 and L3 impact on the response time.

14. methods according to claim 13, wherein, L5 is larger than L1, L2 and L3 impact on the response time.

15. methods according to claim 14, wherein, the described ON response time comprises:

ON response time (ms)=22.1431+1.2675*L1 – 1.28*L2 – 0.2625*L3 – 8.8762*L4+8.1951*L5+0.55*L1*L2 – 2.825*L1*L4 – 2.77*L1*L5+0.655*L2*L4 – 0.6050*L2*L5 – 0.4875*L3*L4 – 4.035*L4*L5.

16. methods according to claim 11, wherein, described lock bolt moves to engagement positio from retracted position needs the described OFF response time.

17. methods according to claim 16, wherein, L1 is larger than L2, L3, L4 and L5 impact on the response time.

18. methods according to claim 17, wherein, L4 is larger than L2, L3 and L5 impact on the response time.

19. methods according to claim 18, wherein, L5 is larger than the impact of L2 and L3 on the response time.

20. methods according to claim 19, wherein, the described OFF response time comprises: OFF response time (ms)=19.731+15.8987*L1+1.17163*L2 – 1.53*L3 – 7.6401*L4 – 4.405*L5+1.3375*L1*L2 – 10.265*L1*L4 – 1.837*L1*L5 – 1.005*L2*L5+1.7875*L4*L5.