CN108267253A - The test method of contact stress between engine rocker roller and camshaft - Google Patents
The test method of contact stress between engine rocker roller and camshaft Download PDFInfo
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- CN108267253A CN108267253A CN201810111241.1A CN201810111241A CN108267253A CN 108267253 A CN108267253 A CN 108267253A CN 201810111241 A CN201810111241 A CN 201810111241A CN 108267253 A CN108267253 A CN 108267253A
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- rocking arm
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- 238000010998 test method Methods 0.000 title claims abstract description 14
- 238000012360 testing method Methods 0.000 claims abstract description 59
- 238000000034 method Methods 0.000 claims description 11
- 238000006073 displacement reaction Methods 0.000 claims description 9
- 239000011888 foil Substances 0.000 claims description 7
- 238000002474 experimental method Methods 0.000 claims description 5
- 238000004088 simulation Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 238000000418 atomic force spectrum Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 241001269238 Data Species 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0009—Force sensors associated with a bearing
- G01L5/0019—Force sensors associated with a bearing by using strain gages, piezoelectric, piezo-resistive or other ohmic-resistance based sensors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
The invention discloses a kind of test method of contact stress between engine rocker roller and camshaft, including：Utilize the strain of strain built-in testing rocking arm being pasted onto on rocking arm；According to the first coefficient of relationship between the strain tested out and the rocking arm obtained in advance strain and the valve spring active force as suffered by foot, the active force as being subject to enough is calculated；According to the active force as being subject to enough and the second coefficient of relationship as suffered by foot between valve spring active force and contact stress obtained in advance, contact stress is calculated, wherein, contact stress of the contact stress between rocking arm roller and camshaft.Above-mentioned technical proposal disclosed in the present application tests the accuracy that can improve test by testing the strain of rocking arm and the contact stress between rocking arm roller and camshaft.
Description
Technical field
The present invention relates to technical field of engines, more specifically to a kind of engine rocker roller and cam between centers
The test method of contact stress.
Background technology
Engine valve actuating mechanism is the requirement of working cycles and firing order carried out according to each cylinder of engine, is pressed
When open and close the inlet and exhaust valve of each cylinder, fresh charge is sucked into cylinder, and the exhaust gas after burning is excluded out of cylinder
Device.
Referring to Fig. 1, it illustrates the structure diagram of engine valve actuating mechanism, including：Camshaft, rocking arm, rocking arm rolling
Son, as foot, valve, air valve bridge and valve spring etc..
The effect of camshaft is to control unlatching and the closure of valve, and the effect of rocking arm changes passes thrust by camshaft
To open valve, the effect for the rocking arm roller being connected by bearing with rocking arm is then to reduce rubbing between camshaft and rocking arm in direction
Wipe power, wherein, be in contact between rocking arm roller and camshaft, formed auxiliary connection, by hinged mode be connected with rocking arm as
The main function of foot is to ensure the active force of valve spring always straight up.Due to being connect between rocking arm roller and camshaft for line
It touches, and the contact between rocking arm roller and camshaft is bigger, this contact stress that will result between the two compares
Greatly, when contact stress between the two is more than the yield limit of both materials, rocking arm roller and camshaft are not only resulted in
Easily there are the failures such as surface peeling, can also make rocking arm roller that apparent plastic deformation occur with camshaft, eventually lead to and start
Machine can not work normally, wherein, required strain when yield limit is the permanent deformation for making sample generation given.Therefore, exist
The engine specimen stage just needs the contact stress between rocking arm roller and camshaft to test, with ensure rocking arm roller with
Contact stress between camshaft is not more than the yield limit of both materials.
The concrete scheme of contact stress between existing test rocking arm roller and camshaft is：At the fillet of camshaft
Placement sensor, and in the central punch of camshaft, the data of test to be drawn using signal wire.But in camshaft
Central punch can reduce the rigidity of camshaft, so as to cause test data inaccuracy, and since the high speed of camshaft is revolved
Turning, corresponding signal wire also in high speed rotation, then needs to be attached using slip ring, this can cause output data to be distorted,
So as to cause test data inaccuracy.
In conclusion there are test datas for the existing technical solution for testing contact stress between rocking arm roller and camshaft
The problem of inaccurate.
Invention content
In view of this, the object of the present invention is to provide a kind of tests of contact stress between engine rocker roller and camshaft
Method, to solve the test data between existing test rocking arm roller and camshaft present in the technical solution of contact stress not
The problem of accurate.
To achieve these goals, the present invention provides following technical solution：
The test method of contact stress between a kind of engine rocker roller and camshaft, including：
Utilize the strain of rocking arm described in the strain built-in testing being pasted onto on rocking arm；
According between the strain tested out and the rocking arm obtained in advance strain and the valve spring active force as suffered by foot
First coefficient of relationship is calculated described as the active force being subject to enough；
According to the active force as being subject to enough and the valve spring active force described as suffered by foot obtained in advance
The second coefficient of relationship between contact stress, is calculated contact stress, wherein, the contact stress for rocking arm roller with it is convex
Contact stress between wheel shaft.
Preferably, the strain using rocking arm described in the strain built-in testing being pasted onto on rocking arm, including：
When the rocking arm generates strain, the variation of the resistance value of the foil gauge is sent to full-bridge circuit, through described
The variation of resistance value is converted into voltage output to voltage amplifier by full-bridge circuit, reads the number of the voltage amplifier output
According to the strain of the rocking arm is calculated according to the data.
Preferably, it when using the strain of rocking arm described in the strain built-in testing being pasted onto on rocking arm, further includes：
The deformation quantity of the valve spring is tested using the eddy displacement sensor being placed in the valve spring, according to
The deformation quantity tests to the strain of the rocking arm tested out.
Preferably, the first coefficient of relationship between rocking arm and the valve spring active force as suffered by foot is obtained in advance, including：
The valve spring is controlled as applying quantitative active force on foot, to test the strain of the rocking arm described, according to
Straining for the active force as being subject to enough and the rocking arm, obtains first coefficient of relationship.
Preferably, the second relationship system between the valve spring active force described as suffered by foot and contact force is obtained in advance
Number, including：
Second between the valve spring active force described as suffered by foot and contact force is obtained beforehand through experiment test
Coefficient of relationship.
Preferably, the second relationship system between the valve spring active force described as suffered by foot and contact force is obtained in advance
Number, including：
Second between the valve spring active force described as suffered by foot and contact force is obtained beforehand through analog simulation
Coefficient of relationship.
The present invention provides a kind of test method of contact stress between engine rocker roller and camshaft, including：It utilizes
It is pasted onto the strain of the strain built-in testing rocking arm on rocking arm；According to the strain tested out and the rocking arm obtained in advance strain with
The first coefficient of relationship between the valve spring active force as suffered by foot, is calculated the active force as being subject to enough；According to as foot by
To active force and the second coefficient of relationship as suffered by foot between valve spring active force and contact stress for obtaining in advance,
Contact stress is calculated, wherein, contact stress of the contact stress between rocking arm roller and camshaft.
Above-mentioned technical proposal disclosed in the present application, pastes foil gauge on rocking arm, using the strain for straining built-in testing rocking arm,
And it according to the rocking arm strain obtained in advance and as foot is by the first coefficient of relationship between the active force of valve spring, is calculated
As the active force being subject to enough, it is then possible to be closed according to second as suffered by foot between active force and contact stress obtained in advance
The contact stress between rocking arm roller and camshaft is calculated in coefficient, due to do not need to destroy camshaft rigidity and into
Row test, and in view of the contact stress between rocking arm roller and camshaft mainly due to the effect of valve spring object foot
Caused by the inertia force of power and valve spring, therefore, by testing the strain of rocking arm and between rocking arm roller and camshaft
Contact stress carry out test and can improve the accuracy of test.
Description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention, for those of ordinary skill in the art, without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is the structure diagram of engine valve actuating mechanism；
The test method of Fig. 2 contact stress between a kind of engine rocker roller provided in an embodiment of the present invention and camshaft
Flow chart.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 2, it illustrates contacted between a kind of engine rocker roller provided in an embodiment of the present invention and camshaft
The flow chart of the test method of stress can include：
S11：Utilize the strain of strain built-in testing rocking arm being pasted onto on rocking arm.
The active force of valve spring object foot and the inertia force of valve spring can cause rocking arm to strain, and can make and shake
Generate contact stress between rocking arm roller and camshaft that arm is connected, therefore, can by test the strain that rocking arm occurred come
The contact stress between rocking arm roller and camshaft is calculated, correspondingly, then foil gauge can be pasted on rocking arm, utilizes strain
Built-in testing goes out the strain that rocking arm is occurred, and the strain tested out is denoted as μ(actual measurement)。
S12：According to the strain tested out and the rocking arm obtained in advance strain with as suffered by foot valve spring active force it
Between the first coefficient of relationship, the active force as being subject to enough is calculated.
Relational expression between strain μ and the valve spring directed force F as suffered by foot that known rocking arm is occurred is：F=E μ,
After getting the size of the first coefficient of relationship E in advance, then the strain μ of rocking arm tested out can be utilized(actual measurement)And first close
The directed force F as being subject to enough is calculated in coefficient E(actual measurement)。
S13：It should according to the active force as being subject to enough and the valve spring active force as suffered by foot obtained in advance and contact
The second coefficient of relationship between power, is calculated contact stress, wherein, contact stress connecing between rocking arm roller and camshaft
Touch stress.
The known valve spring directed force F as suffered by foot and the relationship between rocking arm roller and the contact stress σ of cam between centers
Formula is：It, then can be calculated as foot after the size for getting the second coefficient of relationship Sc in advance
The directed force F being subject to(actual measurement)And the second coefficient of relationship Sc, the contact stress between rocking arm roller and camshaft is calculated
σ(actual measurement)。
It follows that above-mentioned test can not only ensure the accuracy of test, testing cost can also be lowered, and utilize
Aforesaid way can not only calculate the Max.contact stress between rocking arm roller and camshaft, can also test out rocking arm roller
With the contact stress of camshaft in one cycle, and thus obtain between rocking arm strain curve and rocking arm roller and camshaft
Contact stress curve.
Above-mentioned technical proposal disclosed in the present application, pastes foil gauge on rocking arm, using the strain for straining built-in testing rocking arm,
And it according to the rocking arm strain obtained in advance and as foot is by the first coefficient of relationship between the active force of valve spring, is calculated
As the active force being subject to enough, it is then possible to be closed according to second as suffered by foot between active force and contact stress obtained in advance
The contact stress between rocking arm roller and camshaft is calculated in coefficient, due to do not need to destroy camshaft rigidity and into
Row test, and in view of the contact stress between rocking arm roller and camshaft mainly due to the effect of valve spring object foot
Caused by the inertia force of power and valve spring, therefore, by testing the strain of rocking arm and between rocking arm roller and camshaft
Contact stress carry out test and can improve the accuracy of test.
The test method of contact stress between a kind of engine rocker roller and camshaft provided in an embodiment of the present invention utilizes
The strain of the strain built-in testing rocking arm on rocking arm is pasted onto, can be included：
When rocking arm generates strain, the variation of the resistance value of foil gauge is sent to full-bridge circuit, it will be electric through full-bridge circuit
The variation of resistance value is converted into voltage output to voltage amplifier, reads the data of voltage amplifier output, is calculated according to data
To the strain of rocking arm.
When rocking arm is acted on and generates strain, the foil gauge being pasted onto on rocking arm can perceive rocking arm
Strain and the resistance value of itself is made to change, since the variable quantity of resistance value is fainter, then in order to reduce the mistake of test
The variable quantity of resistance value to improve the accuracy of test, can be converted into voltage by difference by full-bridge circuit, and by voltage output
To voltage amplifier, after being amplified through voltage amplifier, the data that voltage amplifier is exported are read, and according to output
Data calculate the strain that rocking arm is occurred, and realize and transmit data without intermediate link, so as to reduce the loss of data or number
According to distortion, to ensure the accuracy of data.
The test method of contact stress between a kind of engine rocker roller and camshaft provided in an embodiment of the present invention, in profit
During with the strain of strain built-in testing rocking arm being pasted onto on rocking arm, it can also include：
Using the deformation quantity of eddy displacement sensor test valve spring being placed in valve spring, according to deformation quantity pair
The strain of the rocking arm tested out is tested.
While using the strain for straining built-in testing rocking arm, eddy displacement sensor can be placed in valve spring,
Using the deformation quantity of eddy displacement sensor test valve spring, and the displacement curve of valve spring is obtained, because of valve spring
The strain cycle phase of displacement period and rocking arm is same, then can the displacement curve of valve spring and rocking arm strain curve be placed on one
It is compared in coordinate system, with the accuracy of detection test.In addition to this, valve spring is tested out in eddy displacement sensor
After deformation quantity, since the rigidity of valve spring is known quantity, then the active force of valve spring can be calculated, is obtained corresponding
Valve spring force profile, and by the contact stress curve between valve spring force profile, rocking arm roller and camshaft
It is placed in a coordinate system and is compared, with the accuracy of detection test.
The test method of contact stress between a kind of engine rocker roller and camshaft provided in an embodiment of the present invention, in advance
The first coefficient of relationship between rocking arm and the valve spring active force as suffered by foot is obtained, can be included：
Control valve spring applies quantitative active force on as foot, the strain of rocking arm is tested, according to as the work being subject to enough
Firmly and the strain of rocking arm, the first coefficient of relationship is obtained.
Obtaining the detailed process of the first coefficient of relationship E in advance can be：Control valve spring applies quantitative on as foot
Directed force F(quantitative), test out the strain μ that rocking arm is occurred at this time(survey), the strain μ that is occurred according to above-mentioned mentioned rocking arm with
Relational expression between the valve spring directed force F as suffered by foot is calculated the first coefficient of relationship E namely is surveyed by way of experiment
The first coefficient of relationship E is tried out, to obtain the first small coefficient of relationship E of application condition, so as to improve the accuracy of test.
The test method of contact stress between a kind of engine rocker roller and camshaft provided in an embodiment of the present invention, in advance
The second coefficient of relationship as suffered by foot between valve spring and contact force is obtained, can be included：
The second coefficient of relationship as suffered by foot between valve spring active force and contact force is obtained beforehand through experiment test.
In the contact stress for testing rocking arm roller and cam between centers, can be obtained beforehand through the mode of experiment test as
The second coefficient of relationship Sc suffered by foot between valve spring active force and contact force, to obtain the second small relationship system of application condition
Number Sc, and reduce the cost needed for test.
The test method of contact stress between a kind of engine rocker roller and camshaft provided in an embodiment of the present invention, in advance
The second coefficient of relationship as suffered by foot between valve spring and contact force is obtained, can be included：
The second coefficient of relationship as suffered by foot between valve spring active force and contact force is obtained beforehand through analog simulation.
In order to improve the accuracy of test, then the second coefficient of relationship Sc can be obtained beforehand through the mode of analog simulation,
This mode for obtaining the second coefficient of relationship Sc is not only simple, efficiently, and cost is than relatively low.
It should be noted that herein, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any this practical relationship or sequence.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Non-exclusive inclusion, so that the element that process, method, article or equipment including a series of elements are intrinsic.
Do not have in the case of more limiting, the element limited by sentence "including a ...", it is not excluded that including the element
Also there are other identical elements in process, method, article or equipment.In addition, above-mentioned technology provided in an embodiment of the present invention
The part consistent with corresponding to technical solution realization principle in the prior art and unspecified in scheme, in order to avoid excessively repeat.
The foregoing description of the disclosed embodiments enables those skilled in the art to realize or use the present invention.To this
A variety of modifications of a little embodiments will be apparent for a person skilled in the art, and the general principles defined herein can
Without departing from the spirit or scope of the present invention, to realize in other embodiments.Therefore, the present invention will not be limited
The embodiments shown herein is formed on, and is to fit to consistent with the principles and novel features disclosed herein most wide
Range.
Claims (6)
1. a kind of test method of contact stress between engine rocker roller and camshaft, which is characterized in that including：
Utilize the strain of rocking arm described in the strain built-in testing being pasted onto on rocking arm；
According to first between the strain tested out and the rocking arm obtained in advance strain and the valve spring active force as suffered by foot
Coefficient of relationship is calculated described as the active force being subject to enough；
According to the active force as being subject to enough and the valve spring active force described as suffered by foot obtained in advance and connect
The second coefficient of relationship between stress is touched, contact stress is calculated, wherein, the contact stress is rocking arm roller and camshaft
Between contact stress.
It is 2. according to the method described in claim 1, it is characterized in that, described using described in the strain built-in testing being pasted onto on rocking arm
The strain of rocking arm, including：
When the rocking arm generates strain, the variation of the resistance value of the foil gauge is sent to full-bridge circuit, through the full-bridge
The variation of resistance value is converted into voltage output to voltage amplifier by circuit, reads the data of the voltage amplifier output, root
The strain of the rocking arm is calculated according to the data.
3. it according to the method described in claim 2, it is characterized in that, is shaken using described in the strain built-in testing being pasted onto on rocking arm
During the strain of arm, further include：
The deformation quantity of the valve spring is tested using the eddy displacement sensor being placed in the valve spring, according to described
Deformation quantity tests to the strain of the rocking arm tested out.
4. according to the method described in claim 1, it is characterized in that, rocking arm and the valve spring active force as suffered by foot are obtained in advance
Between the first coefficient of relationship, including：
The valve spring is controlled, as applying quantitative active force on foot, the strain of the rocking arm to be tested, according to described described
As straining for the active force that is subject to enough and the rocking arm, first coefficient of relationship is obtained.
5. according to the method described in claim 4, it is characterized in that, the valve spring effect described as suffered by foot is obtained in advance
The second coefficient of relationship between power and contact force, including：
The second relationship between the valve spring active force described as suffered by foot and contact force is obtained beforehand through experiment test
Coefficient.
6. according to the method described in claim 4, it is characterized in that, the valve spring effect described as suffered by foot is obtained in advance
The second coefficient of relationship between power and contact force, including：
The second relationship between the valve spring active force described as suffered by foot and contact force is obtained beforehand through analog simulation
Coefficient.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810065495 | 2018-01-23 | ||
| CN2018100654954 | 2018-01-23 |
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| CN108267253A true CN108267253A (en) | 2018-07-10 |
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| CN201810111241.1A Pending CN108267253A (en) | 2018-01-23 | 2018-02-05 | The test method of contact stress between engine rocker roller and camshaft |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114689231A (en) * | 2022-03-30 | 2022-07-01 | 安徽华菱汽车有限公司 | Camshaft contact stress testing method |
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2018
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Application publication date: 20180710 |