CN110118521A - Valve clearance rule measuring device and method under engine real machine working condition - Google Patents
Valve clearance rule measuring device and method under engine real machine working condition Download PDFInfo
- Publication number
- CN110118521A CN110118521A CN201811525001.2A CN201811525001A CN110118521A CN 110118521 A CN110118521 A CN 110118521A CN 201811525001 A CN201811525001 A CN 201811525001A CN 110118521 A CN110118521 A CN 110118521A
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- China
- Prior art keywords
- elastic element
- valve
- fixture block
- element installation
- engine
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/14—Measuring arrangements characterised by the use of mechanical techniques for measuring distance or clearance between spaced objects or spaced apertures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
Abstract
The invention belongs to Engine Block Test technical fields, and specifically disclose valve clearance rule measuring device and method under engine real machine working condition, including upper and lower elastic element installation fixture block, elastic element, pressure measuring element and dynamic signal acquisition analysis system, upper elastic element installation fixture block is mounted on valve rocker, its outside is provided with elastic element installation set, is used for elastic elements one end；Lower elastic element installation fixture block is mounted on the valve stem of engine to be measured, and the lower elastic element installation card block body of valve stem fixation hole is provided with including middle part, and outside is equipped with lower elastic element installation set, is used for the elastic elements other end；Pressure measuring element is mounted on elastic element one end, is transmitted to dynamic signal acquisition analysis system for measuring elastic element transient pressure, and by pressure signal.The on-line measurement of valve clearance rule under engine real machine operating status can be achieved in the present invention, provides foundation for engine valve actuating mechanism design and optimization.
Description
Technical field
The invention belongs to Engine Block Test technical fields, more particularly, to the valve under engine real machine working condition
Gap rule measuring device and method.
Background technique
Valve actuating mechanism is one of engine important composition system, it according to engine combustion sequence requirement, time opening or
Valve to be closed, fresh air is made to enter cylinder, exhaust gas is discharged out of cylinder, meanwhile, in engine compresses stroke and working stroke
The middle sealing for guaranteeing combustion chamber.The size of valve clearance is one of the important parameter for influencing engine performance.Valve clearance is excessive,
Valve opening is delayed, and valve-closing shifts to an earlier date, and the time of valve opening is caused to shorten, that is, shortens the inlet and outlet time of engine,
Making engine, power declines due to air inlet is insufficient, exhaust is not clean.In addition, also increasing the shock of valve actuating mechanism part, abrasion adds
Fastly.Valve clearance is too small, then valve actuating mechanism part expanded by heating increases valve stroke when will lead to engine operation, to make gas
Door is not closed completely, and causes gas leakage, power decline, and will lead to the serious carbon distribution in valve sealing surface or burn out, or even generate valve
Hit the harsh conditions of piston.So carrying out the valve clearance rule measurement under engine real machine operating status, optimization is started
Machine Design of Valve, assessment engine valve actuating mechanism operating status, the reliability service for guaranteeing engine etc. suffer from weight
The directive significance wanted.
Currently, valve clearance measurement is mostly that it is complete to carry out engine assembly by designing certain valve clearance measuring device
Valve clearance measurement under off working state after, to adjust the size of valve clearance, or verifying engine assembly process
In valve clearance adjustment it is whether suitable.Such as patent CN98233003.0, CN201510570365.2,
CN201610089816.5, CN201620806314.5 etc..Between valve under few measurement engine real machine working conditions
Gap gauge rule.
After 2017, start occur carrying out the valve clearance measurement under engine real machine working condition, such as
CN201710381026.9, CN201710787701.8.But above-mentioned patent CN201710381026.9 is shaken using foil gauge measurement
The strain generated after arm and valve stem collision, measures the state of valve clearance indirectly, and this measurement method needs to carry out complicated
Coefficient calibration, and the rocker arm of rocker arm replacement or transformation original machine that original machine is perhaps transformed is needed replacing, it may result in and shake
The inertia of arm changes, and changes so as to cause the comprehensive kinematic and dynamic modeling of valve actuating mechanism, as valve dynamic by
Power and dynamic acceleration characteristic change, and then cause the change of valve clearance.In addition, in engine real machine operating condition
Under, engine luggine is relatively more, and the horizontal signal detection unit that will lead on its rocker arm can also generate stress error because of vibration.
These problems lead to the possibly exact value that can not measure valve clearance of the measuring device of the patent, and especially engine real machine works
Valve clearance exact value under state.The driving machine in valve actuating mechanism motion process is measured in patent CN201710787701.8
The stress situation of structure, and the tappet lifting curve for cooperating cam profile to be calculated are closed by stress and the corresponding of lifting curve
System first determines that valve clearance is 0 crankshaft moment, further according to the lifting curve value at this moment, so that it may judge engine work
Maximum valve clearance value during work.This method can only obtain maximum valve clearance value, and what cannot obtain each when inscribed
Valve clearance rule.It, which uses to calculate by cam profile, simultaneously obtains theoretical lifting curve, has ignored the power of valve actuating mechanism
Learn characteristic, i.e. the inertia of valve actuating mechanism will lead to tappet under motion state and not run according to theoretical lifting curve, so as to cause
There may be large errors for the maximum valve clearance that the patent obtains.
Therefore, it is deposited according to the valve clearance measurement demand under engine real machine working condition with the above measurement method or device
The problem of, this field urgently measuring device of the researching and designing for the valve clearance rule under engine real machine working condition,
To realize the measurement of valve clearance changing rule.
Summary of the invention
Engine real-time running state is not suitable for for aforementioned existing measuring device and method or cannot accurately be measured
The problem of, the present invention provides the valve clearance rule measuring devices and method under a kind of engine real machine working condition, lead to
It crosses and designs matched elastic element installation fixture block, elastic element and pressure measuring element, it can be achieved that engine real machine operating status
The on-line measurement of lower valve clearance rule can provide reference frame for the design and optimization of engine valve actuating mechanism, and this method is not
Need to carry out the transformation of valve actuating mechanism original structure, and the measuring part quality installed is smaller, will not influence valve actuating mechanism
Original dynamic property and kinematics characteristic have higher precision and better ease of use.
To achieve the above object, according to one aspect of the present invention, it proposes under a kind of engine real machine working condition
Valve clearance rule measuring device comprising upper elastic element installation fixture block, lower elastic element install fixture block, elastic element, pressure
Power measuring cell and dynamic signal acquisition analysis system, in which:
The upper elastic element installation fixture block is mounted on the valve rocker of engine to be measured, the elastic element installation card
It is provided with elastic element installation set on the outside of block, for installing one end of the elastic element, guarantees that elastic element does not generate
Bending；
The lower elastic element installation fixture block is mounted on the valve stem of engine to be measured comprising lower elastic element peace
Be loaded block body, offers valve stem fixation hole in the middle part of the lower elastic element installation card block body, outside is provided with lower elasticity
Element installation set, for the other end of elastic elements, to guarantee that elastic element does not generate bending；
The pressure measuring element is mounted on one end of elastic element, causes for measuring because of the variation of valve clearance rule
Elastic element transition pressure, and by measurement obtain pressure signal be transmitted in dynamic signal acquisition analysis system.
It, should as it is further preferred that upper elastic element installation fixture block includes upper elastic element installation card block body
Upper fixture block body design is at the recessed poor structure of thin-and-long, and to wrap one end of valve rocker, the side of the recessed poor structure is machined with
Multiple tapped through holes are equipped with lock-screw in the tapped through hole, by tightening lock-screw for upper elastic element installation card
Block is mounted on valve rocker.
As it is further preferred that being also provided with gap on the lower elastic element installation card block body and bolt is fixed
Hole, the gap are located at the side of lower elastic element installation card block body, and are connected to valve stem fixation hole, and the bolt is fixed
Hole machined is in gap two sides and runs through lower elastic element installation card block body, and the bolt fixing hole is logical with this for installing bolt
It crosses and is driven through the bolt of bolt fixing hole and is closed gap, and then be deformed valve stem fixation hole, thus by lower elasticity
Element installation fixture block is stably mounted on valve stem.
As it is further preferred that the measuring device further includes elastic element installation fixture block, elastic element peace
The block that is loaded is mounted on the air valve bridge of engine to be measured.
As it is further preferred that elastic element installation fixture block includes the middle elasticity of integrally formed or seperated forming
Element installs fixture block and elastic element installs lower fixture block, and the elastic element installs fixture block and is located at upper elastic element peace
Be loaded the lower section of block, and installation has elastic component between the two, to form a pair of of valve clearance rule measuring unit, for measuring
Valve clearance rule between valve rocker pressure face and air valve bridge, the elastic element install lower fixture block and are located at lower elasticity member
Part installs the top of fixture block, and installation has elastic component between the two, to form a pair of of valve clearance rule measuring unit, is used for
Measure the valve clearance rule between air valve bridge and valve stem.
As it is further preferred that it includes upper fixture block ontology that the elastic element, which installs fixture block, the upper fixture block ontology
The narrow structure being designed to fit on air valve bridge is machined with multiple tapped through holes thereon, by the spiral shell for being driven through tapped through hole
Upper fixture block is mounted on air valve bridge by nail.
As it is further preferred that it includes lower fixture block ontology that the elastic element, which installs lower fixture block, the lower fixture block ontology
The recessed poor structure of thin-and-long is designed as to wrap one end of air valve bridge, side is machined with multiple tapped through holes, wears by tightening
Lower fixture block is mounted on air valve bridge by the screw for crossing tapped through hole.
As it is further preferred that the outer diameter of the elastic element is smaller than the internal diameter of the elastic element installation set at its both ends
1mm-2mm, the spacing of the elastic element installation set at elastic element both ends are greater than corresponding maximum valve clearance, preferably big 2mm-
4mm。
As it is further preferred that the rigidity of elastic element is much smaller than the rigid of the valve spring being mounted on outside valve stem
Degree.
It is another aspect of this invention to provide that a kind of survey of the valve clearance rule under providing engine real machine working condition
Amount method uses the measuring device to measure, including such step:
Before S1 engine starts real machine experiment, determine that valve clearance is 0 corresponding with elastic element when maximum valve clearance
Elastic force F1And F2, according to the difference of two valve clearances and the F of measurement1And F2It is worth the coefficient of elasticity k for determining elastic element (8)；
S2 engine starts real machine experiment, and real-time measurement goes out the elastic force F of elastic element, calculates elastic shape according to the following formula
Variable Δ x:
Δ x=(F-F1)/k
S3 can be obtained the valve clearance rule under engine behavior according to the amount of elastic deformation Δ x at each moment.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, mainly have below
Technological merit:
1. valve clearance does not stop to change with crank angle under engine real machine operating status, valve clearance rule is cooled
Running temperature of state valve clearance, Valve Dynamics feature and engine etc. influences.Compared to non-engine operation shape
Valve clearance under state measures, the valve clearance rule measuring device under the engine real machine working condition of researching and designing of the present invention
The on-line measurement that valve clearance rule under engine real machine operating status can be achieved can be measured the kinematics of valve assembly and move
Laws of Mechanics flies off for the shock for solving engine valve actuating mechanism, and the improper kinematics such as knock-on and dynamics problem provide essence
True data foundation, so that performance is more excellent, and the higher engines distribution structure of reliability has established dynamical foundation to design.
2. the present invention do not need carry out valve actuating mechanism original structure transformation, and the measuring part quality installed compared with
It is small, it will not influence the original comprehensive kinematic and dynamic modeling of valve actuating mechanism, therefore, the present invention is with higher precision and preferably
Ease of use.
3. elastic element installation set of the invention is all processed on elastic element installation fixture block, these elastic element installation cards
Block is respectively installed to again at the valve rocker, valve stem and air valve bridge of valve actuating mechanism, can be realized simultaneously valve rocker and gas
Valve clearance, valve rocker between the raft of pontoons and the valve clearance between valve and the valve between air valve bridge and valve stem
The measurement in gap provides foundation for kinematics, the Dynamics Optimization of entire valve actuating mechanism, so as to improve the reliable of valve actuating mechanism
Property.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of valve clearance rule on-line measurement device；
Fig. 2 is the structural schematic diagram that upper elastic element installs fixture block；
Fig. 3 is lower elastic element installation card block structure schematic diagram；
Fig. 4 is the structural schematic diagram of another valve clearance rule on-line measurement device；
Fig. 5 is the structural schematic diagram of upper fixture block；
Fig. 6 is the structural schematic diagram of lower fixture block；
Fig. 7 is the assembling schematic diagram of elastic element and elastic element installation set.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
As shown in Figure 1, the valve clearance rule under a kind of engine real machine working condition provided in an embodiment of the present invention is surveyed
Measure device comprising upper elastic element installation fixture block 4, lower elastic element install fixture block 5, elastic element 8, pressure measuring element 9
And dynamic signal acquisition analysis system 10, wherein the valve that upper elastic element installation fixture block 4 is mounted on engine to be measured shakes
On arm 1, the outside of elastic element installation fixture block 4 is provided with elastic element installation set 4-3, for elastic elements 8
One end guarantees that elastic element 8 does not generate bending；Lower elastic element installation fixture block 5 is mounted on the valve stem 2 of engine to be measured
On comprising gas is offered in the middle part of lower elastic element installation card block body 5-1, the lower elastic element installation card block body 5-1
Door rod fixation hole 5-2, outside are provided with lower elastic element installation set 5-3, for the other end of elastic elements 8, to guarantee
Elastic element 8 does not generate bending；Pressure measuring element 9 is mounted on one end of elastic element, and is located at corresponding elastic element and pacifies
In encapsulation, the elastic pressure of elastic element transition (instantaneous variation) caused by being used to measure because of the variation of valve clearance rule, and
The pressure signal that measurement obtains is transmitted in dynamic signal acquisition analysis system 10, for subsequent analysis.
As shown in Fig. 2, upper elastic element installation fixture block 4 is mounted on valve rocker 1, it is however generally that, valve rocker 1 is all
Thin-and-long structure, so the upper fixture block ontology 4-1 of upper elastic element installation fixture block 4 is designed as the recessed poor structure of thin-and-long, groove
One end of valve rocker can be wrapped.Multiple tapped through hole 4-2 are respectively machined in the groove side of upper elastic element installation fixture block,
Lock-screw is installed in tapped through hole 4-2, by tightening the screw, upper elastic element can be installed fixture block 4 and installed
On valve rocker 1.The outside of upper elastic element installation fixture block 4 is provided with elastic element installation set 4-3, for fixed elasticity
One end of element 8, and elastic element is kept not generate bending, it is however generally that, it is evenly equipped with multiple upper elastic element installation sets.
As shown in figure 3, offering gas in the middle part of the lower elastic element installation card block body 5-1 of lower elastic element installation fixture block 5
Door rod fixation hole 5-1, for lower elastic element installation fixture block 5 to be mounted on valve stem 2, lower elastic element installation card block body
It is provided with multiple lower elastic element installation set 5-3 on the outside of 5-1, for fixing one end of elastic element, and keeps elastic element
Bending is not generated, it is however generally that, multiple lower elastic element installation sets are evenly distributed on around valve stem, and are pacified with upper elastic element
Encapsulation is corresponding.
In order to guarantee being reliably connected for lower elastic element installation fixture block 5 and valve stem 2, lower elastic element installation card block body
The gap 5-4 and bolt fixing hole 5-5 of a wide 3-6mm are also provided on 5-1.Gap 5-4 is located at pressure valve clamp block body 5
Side (such as right end in Fig. 3), gap 5-4 be connected to valve stem fixation hole 5-2, and gap 5-4 opens up direction and gas
Door rod fixation hole 5-2's opens up that direction is identical, and the axis of bolt fixing hole 5-5 is vertical with the axis of valve stem fixation hole 5-2, should
Bolt fixing hole 5-5 is the bolt hole for always wearing elastic element installation card block body 5-1 processed in gap two sides, the bolt
Bolt is loaded onto after lower elastic element installation fixture block 5 is mounted on valve stem 2 with this, is worn by tightening for installing bolt in hole
The bolt for crossing bolt fixing hole 5-5 is closed gap 5-4, and gap closure is deformed valve stem fixation hole 5-2, and deformation force will
Valve stem fixation hole 5-2 and valve stem 2 tightly stick together, so that lower elastic element installation fixture block 5 is fixedly secured to gas
In door rod 2.
When valve is directly contacted with valve rocker 1 in engine, then only need to measure a valve clearance, i.e. valve shakes
Gap (i.e. s1 in Fig. 1) between arm pressure face and valve stem top surface, at this time, it is only necessary to which elastic element installs fixture block in design
4 and lower elastic element fixture block 5 is installed, pass through upper elastic element fixture block 4 and lower elastic element be installed and the composition of fixture block 5 one is installed
To valve clearance rule measuring unit, and it is provided with fixed elastic element 8 (measuring device i.e. shown in FIG. 1) between the two, it is real
Gap rule measurement between existing valve rocker pressure face and valve stem top surface.
When being disposed with 6 structure of air valve bridge between valve and valve rocker 1, this 6 structure of air valve bridge is that Four valve starts
A kind of common arrangement on machine (such as marine four strokes diesel engine), use are very universal.At this point, there are two types of valve clearances, i.e.,
Between between gap (i.e. s2 in Fig. 4) and air valve bridge 6 and valve stem 2 between 1 pressure face of valve rocker and air valve bridge 6
Gap (i.e. s3 in Fig. 4), it is then desired to two kinds of valve clearances be measured, to instruct Design of Valve.In such engines,
There is elastic element that fixture block 7 is installed with regard to design, as shown in figure 4, being had various forms of according to the specific structure of different valve actuating mechanisms
Elastic element installs fixture block.
Specifically, elastic element installation fixture block 7 be fixed on air valve bridge 6, elastic element install fixture block 7 either
One overall structure, part of it and upper elastic element installation fixture block 4 form a pair of of valve clearance measuring unit, another part and
Lower elastic element installation fixture block 5 forms a pair of of valve clearance measuring unit.Elastic element fixture block 7 can certainly be installed to set
Separate structure is counted into, fixture block 7-1 is installed by elastic element and elastic element is installed lower two structures of fixture block 7-2 and constituted,
The measuring unit of two pairs of valve clearances is formed to install fixture block 4 and lower elastic element installation fixture block 5 with upper elastic element respectively, under
The structure that fixture block 7-1 and elastic element install lower fixture block 7-2 is installed to elastic element respectively in conjunction with attached drawing and is had in face
Body explanation.
As shown in figure 5, since air valve bridge 6 is generally also thin-and-long structure, so elastic element installation fixture block can be set
Count into different structure form.It is designed as entangling the narrow structure of air valve bridge specifically, elastic element installs fixture block 7-1,
Upper fixture block ontology 7-1-1 structure is similar with air valve bridge contour structures, and multiple tapped through hole 7-1- are machined in upper fixture block ontology
2, lock-screw is installed in tapped through hole, elastic element can be installed to fixture block 7-1 by tightening screw is mounted on
On air valve bridge 6.
As shown in fig. 6, elastic element install lower fixture block 7-2 may be designed as fixture block 4 is installed to upper elastic element it is similar
Structure is the recessed poor structure of thin-and-long, and groove can wrap one end of air valve bridge, in the groove side of lower fixture block ontology 7-2-1
Multiple tapped through hole 7-2-2 are respectively machined with, lock-screw is installed in tapped through hole, it can be by middle elasticity by tightening screw
Element is installed lower fixture block 7-2 and is mounted on air valve bridge 6.
Specifically, elastic element, which installs outer fix in the middle part of fixture block 7-1, is provided with fixture block elastic element installation set
7-1-3, elastic element install lower fixture block 7-2 outer fix and are provided with lower fixture block elastic element installation set 7-2-3, wherein bullet
Property element installation set 7-1-3 be used to fix one end of elastic element, and elastic element is kept not generate bending, it is first with upper elasticity
The upper elastic element installation set 4-3 that part installs fixture block 4 is corresponding, a pair of of valve clearance rule measuring unit is formed, for measuring
Valve clearance rule between 1 pressure face of valve rocker and air valve bridge 6.Lower fixture block elastic element installation set 7-2-3 is uniformly distributed
Around valve stem, for fixing one end of another group of elastic element, and elastic element is kept not generate bending, with lower elasticity
The lower elastic element installation set 5-3 that element installs fixture block 5 is corresponding, a pair of of valve clearance rule measuring unit is formed, for surveying
Measure the valve clearance rule between air valve bridge 6 and valve stem 2.
As shown in fig. 7, the both ends of elastic element 8 are directly installed in corresponding a pair of of elastic element installation set, such as pacify
Between upper elastic element installation set 4-3 and lower elastic element installation set 5-3, upper elastic element installation set 4-3 and upper fixture block
Between elastic element installation set 7-1-3, between lower fixture block elastic element installation set 7-2-3 and lower elastic element installation set 5-3.Bullet
The outer diameter of property element 8 is 1mm-2mm smaller than elastic element installation set (such as 4-3 and 5-3) internal diameter, to increase guiding performance, prevents bullet
Property element 8 bending so as to cause measurement accuracy decline.Install the elastic element 8 a pair of of elastic element installation set (such as 4-3 and
Gap between 5-3) should be greater than the maximum valve of corresponding position (such as between valve rocker pressure face and valve stem top surface)
Gap, to prevent generating collision between elastic element installation set (such as 4-3 and 5-3), while to prevent elastic element to be bent, between being somebody's turn to do
Gap cannot be excessive, and comprehensive selection gap is only 2mm-4mm bigger than corresponding valve clearance.In addition, the rigidity of elastic element 8 need to be remote small
The elastic force of the rigidity of valve spring 3 in valve actuating mechanism, that is, the elastic element installed must not produce the characteristics of motion of valve actuating mechanism
Raw influence, or influence are relatively small, which is sleeved on outside valve stem, the reset for valve.
Specifically, pressure measuring element 9 is coin shape load-sensing unit, the pressure measuring element of selection is needed with volume
It is small, the features such as high sensitivity, measurement accuracy is high, such as silicon pressure drag component.Pressure measuring element 9 is mounted on the one of elastic element 8
End, and be located in elastic element installation set (4-3,5-3,7-1-3,7-2-3), since pressure measuring element 9 is mounted on elastic member
8 one end of part, so pressure measuring element 9 is identical with 8 pressure of elastic element, and pressure suffered by elastic element 8 is by valve
Gap variation causes, and pressure measuring element 9 is connected with dynamic signal acquisition analysis system 10, carries out the survey of pressure (i.e. elastic force)
Amount.In the measurement of one valve clearance rule, a pair of of elastic element installation set unilateral can be installed, but in order to improve measurement essence
Degree, it is proposed that bilateral respectively installs a pair of of elastic element installation set, or the multipair elastic element installation set of installation, each pair of elastic element installation
The pressure measuring element positioned at elastic element one end between set measures pressure to calculate and obtain gap variable quantity, i.e., each pair of bullet
Property element installation set and its interior pressure measuring element can get a gap variable quantity, then take the flat of all gap variable quantities
Mean value is as final gap variable quantity.
For the signal acquisition requirement for meeting high speed tooling, dynamic signal acquisition analysis system 10 is at least able to satisfy 20KHZ's
Sample frequency requirement.For the interference component in removal sensor output signal, dynamic signal acquisition analysis system 10 should have letter
The functions such as operation (signal subtraction), filtering between number.In addition, dynamic signal acquisition analysis system 10 should also have signal to show, number
According to functions such as preservation outputs.Measuring cell in the present invention is elastic element 8 and pressure measuring element 9, passes through pressure measurement member
Part 9 measures the elastic force of elastic element 8, can calculate amount of elastic deformation by Hooke theorem (Hooke's law):
Δ F=k × Δ x (1)
In formula, Δ F is the difference of pressure (i.e. elastic force) twice, and pressure is measured by pressure measuring element 9 and obtained, and k is elasticity
The coefficient of elasticity of element, Δ x are the difference of deformation of elastic components amount twice.
Before the experiment of engine real machine starts, towing astern engine is first passed through, determines corresponding elastic force when valve clearance is 0
F1, elastic force F1It is detected and is obtained by pressure measuring element 9, determine (i.e. cold conditions valve clearance, gap at maximum valve clearance
Value can be actually measured) when corresponding elastic force F2, elastic force F2It is detected and is obtained by pressure measuring element 9, by two valve clearances
The elastic force F that difference (i.e. Δ x, size are cold conditions valve clearance) and two measurements obtain1And F2Difference (i.e. Δ F) generation
Enter the coefficient of elasticity k that can determine elastic element 8 in formula (1).When engine real machine is tested, real-time measurement goes out each elastic element
Elastic force F, then when coefficient of elasticity k obtained by front and valve clearance are 0 corresponding elastic force F1, pass through formula (1), i.e. F-
F1=k × Δ x, so that it may calculate the amount of elastic deformation difference DELTA x of elastic element, and then obtain engine under the operating condition
Valve clearance rule.
Below to the course of work of the valve clearance rule measuring device under engine real machine working condition of the invention into
Row explanation.
When engine real machine is run, since the inertia force of valve rocker and valve stem is inconsistent, valve rocker and valve stem
Relative motion can be generated, so as to cause valve clearance is generated between valve rocker and valve stem, because of elastic element installation up and down
Fixture block is separately fixed on valve rocker and valve stem, suffered by relative motion the characteristics of motion respectively with rocker arm, valve stem
It is identical, between air valve bridge and valve rocker, between air valve bridge and valve stem similarly.
When the gap variation between valve rocker and valve stem, the distance between upper and lower fixture block also changes, and makes bullet
The shape of property element changes (elongated or shorten), and the F for obtaining real-time measurement changes, by the F measured in real time and bullet
Property power F1It compares to obtain Δ F=F-F1, according to Δ F=Δ x × k, the real-time change amount Δ x in available gap (namely elasticity
The deformation quantity difference of element), according to the gas under corresponding gap variation delta x of each moment you can get it engine behavior
Door gap rule.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (10)
1. the valve clearance rule measuring device under a kind of engine real machine working condition, which is characterized in that including upper elasticity member
Part installation fixture block (4), lower elastic element installation fixture block (5), elastic element (8), pressure measuring element (9) and Dynamic Signal are adopted
Set analysis system (10), in which:
Upper elastic element installation fixture block (4) is mounted on the valve rocker (1) of engine to be measured, elastic element installation
It is provided with elastic element installation set (4-3) on the outside of fixture block (4), for installing one end of the elastic element (8), guarantees bullet
Property element (8) does not generate bending；
Lower elastic element installation fixture block (5) is mounted on the valve stem (2) of engine to be measured comprising lower elastic element
Installation card block body (5-1) offers valve stem fixation hole (5-2) in the middle part of the lower elastic element installation card block body (5-1),
Outside is provided with lower elastic element installation set (5-3), the other end of elastic elements (8) is used for, to guarantee elastic element (8)
Bending is not generated；
The pressure measuring element (9) is mounted on one end of elastic element (8), leads for measuring because of the variation of valve clearance rule
The pressure of the elastic element transition of cause, and the pressure signal that measurement obtains is transmitted to dynamic signal acquisition analysis system (10)
In.
2. the valve clearance rule measuring device under engine real machine working condition as described in claim 1, which is characterized in that
Upper elastic element installation fixture block (4) includes upper elastic element installation card block body (4-1), and fixture block ontology (4-1) is set on this
The recessed poor structure of thin-and-long is counted into, to wrap one end of valve rocker, the side of the recessed poor structure is machined with multiple tapped through holes
(4-2), the tapped through hole (4-2) is interior to be equipped with lock-screw, and upper elastic element is installed fixture block by tightening lock-screw
(4) it is mounted on valve rocker (1).
3. the valve clearance rule measuring device under engine real machine working condition as described in claim 1, which is characterized in that
Gap (5-4) and bolt fixing hole (5-5), the seam are also provided on the lower elastic element installation card block body (5-1)
Gap (5-4) is located at the side of lower elastic element installation card block body (5-1), and is connected to valve stem fixation hole (5-2), the spiral shell
Bolt fixation hole (5-5) processing is in gap two sides and runs through lower elastic element installation card block body (5-1), the bolt fixing hole (5-
5) for installing bolt, it is closed gap (5-4) by being driven through the bolt of bolt fixing hole (5-5) with this, and then make gas
Door rod fixation hole (5-2) is deformed, so that lower elastic element installation fixture block (5) is stably mounted on valve stem (2).
4. the valve clearance rule measuring device under engine real machine working condition as described in claim 1, which is characterized in that
The measuring device further includes elastic element installation fixture block (7), and elastic element installation fixture block (7) is mounted on hair to be measured
On the air valve bridge (6) of motivation.
5. the valve clearance rule measuring device under engine real machine working condition as described in claim 1, which is characterized in that
Elastic element installation fixture block (7) include integrally formed or seperated forming elastic element install fixture block (7-1) and
Elastic element is installed lower fixture block (7-2), and the elastic element installs fixture block (7-1) and is located at upper elastic element installation fixture block
(4) lower section, and installation has elastic component (8) between the two, to form a pair of of valve clearance rule measuring unit, for measuring
Valve clearance rule between valve rocker (1) pressure face and air valve bridge (6), the elastic element install lower fixture block (7-2)
Positioned at the top of lower elastic element installation fixture block (5), and between the two, installation has elastic component (8), to be formed between a pair of of valve
Gap gauge restrains measuring unit, for measuring the rule of the valve clearance between air valve bridge (6) and valve stem (2).
6. the valve clearance rule measuring device under engine real machine working condition as claimed in claim 5, which is characterized in that
It includes upper fixture block ontology (7-1-1) that the elastic element, which installs fixture block (7-1), which is designed to
The narrow structure on air valve bridge is covered, multiple tapped through holes (7-1-2) is machined with thereon, by being driven through tapped through hole (7-
Upper fixture block (7-1) is mounted on air valve bridge (6) by screw 1-2).
7. the valve clearance rule measuring device under engine real machine working condition as claimed in claim 5, which is characterized in that
It includes lower fixture block ontology (7-2-1) that the elastic element, which installs lower fixture block (7-2), which is designed as
To wrap one end of air valve bridge, side is machined with multiple tapped through holes (7-2-2), is worn by tightening the recessed poor structure of thin-and-long
Lower fixture block (7-2) is mounted on air valve bridge (6) by the screw for crossing tapped through hole (7-2-2).
8. such as the valve clearance rule measuring device under the described in any item engine real machine working conditions of claim 5-7,
It is characterized in that, the outer diameter of the elastic element (8) is 1mm-2mm smaller than the internal diameter of the elastic element installation set at its both ends, elasticity member
The spacing of the elastic element installation set at part (8) both ends is greater than corresponding maximum valve clearance, preferably big 2mm-4mm.
9. such as the valve clearance rule measuring device under the described in any item engine real machine working conditions of claim 1-8,
It is characterized in that, the rigidity of elastic element (8) is much smaller than the rigidity for being mounted on the external valve spring (3) of valve stem (2).
10. the valve clearance rule measurement method under a kind of engine real machine working condition, which is characterized in that wanted using such as right
The described in any item measuring devices of 1-9 are asked to measure, including such step:
Before S1 engine starts real machine experiment, elastic element when valve clearance is 0 and engine cold state maximum valve clearance is determined
Corresponding elastic force F1And F2, according to the difference of two valve clearances and the F of measurement1And F2It is worth the elasticity system for determining elastic element (8)
Number k；
S2 engine starts real machine experiment, and real-time measurement goes out the elastic force F of elastic element, calculates amount of elastic deformation according to the following formula
Δ x:
Δ x=(F-F1)/k
S3 can be obtained the valve clearance rule under engine behavior according to the amount of elastic deformation Δ x at each moment.
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| CN201811525001.2A CN110118521B (en) | 2018-12-13 | 2018-12-13 | Valve clearance rule measuring device and method in real engine working state |
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| CN201811525001.2A CN110118521B (en) | 2018-12-13 | 2018-12-13 | Valve clearance rule measuring device and method in real engine working state |
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| CN113893977A (en) * | 2021-10-12 | 2022-01-07 | 联德(广州)机械有限公司 | Aluminum profile liquid coating and powder spraying device |
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| CN110118521B (en) | 2020-10-16 |
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