CN105808897A - Optimization design method of offset cam type air inlet control mechanism - Google Patents
Optimization design method of offset cam type air inlet control mechanism Download PDFInfo
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- CN105808897A CN105808897A CN201610347722.3A CN201610347722A CN105808897A CN 105808897 A CN105808897 A CN 105808897A CN 201610347722 A CN201610347722 A CN 201610347722A CN 105808897 A CN105808897 A CN 105808897A
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Abstract
The invention relates to an optimization design method of an offset cam type air inlet control mechanism. The optimization design method is characterized in that an offset cam type structure with a cam and a cam shaft in an integral structure is used; a jacking pin is driven to do linear movement along a guide groove through the cam curve surface; a cam eccentric pitch and the jacking pin contact curve surface are optimized, so that the cam curve surface drives the jacking pin to meet the thrust equivalent and unbalance loading balance principle; the large-force arm and large-moment function is realized; the installation in a narrow space is convenient. The method has the beneficial effects that the curve surface-curve surface contact obtains the same thrust as the curve surface-plane contact through optimizing the jacking pin contact curve surface; the thrust equivalent principle is met; in addition, the reasonable jacking pin cylinder radius dimension can be obtained through enabling the jacking pin contact curve surface to adapt to the jacking pin cylinder radius change; the cam eccentric pitch and the jacking pin contact curve radius is selected, so that the pressure angle change amplitude is minimum; the symmetrical distribution along the jacking pin axial line is realized, the offsetting balancing principle is met; the small-force-arm large-moment function and the structure compactness requirements are met; the installation in the narrow space is convenient.
Description
Technical field
The invention belongs to airbag aeration control method, particularly relate to one and air bag enforcement high-pressure mini is filled
Gas cylinder inflation uses the Optimization Design of offset cam formula inlet control mechanism.
Background technology
Ship plugging and sea rescue are the important contents of safety of maritime navigation, mainly utilize leak stopper and rescue
Generating apparatus carrys out guarantee for implement.Gasbag-type leak stopper and lifesaving appliance have light weight, can furl storage,
The advantage such as easy to carry, therefore, earns widespread respect in recent years and researches and develops.Gasbag-type leak stopper is
A kind of utilize air bag to hull cut implement leak stopping leak-stopping equipment, gasbag-type lifesaving appliance includes
Life jacket, life raft etc..Gasbag-type leak stopper and lifesaving appliance technology it is critical only that entering of air bag
Gas control system, it is desirable to can quickly give airbag aeration and ensure air-tightness.Gasbag-type leak stopper and lifesaving
The air inlet of device controls generally to utilize cam mechanism to realize, and is rotated by cam and drives thimble to make straight line
Motion so that it is puncture the metal film of high-pressure mini inflation steel cylinder, release bottle inner high voltage gas quickly gives gas
Capsule is inflated.But the cam mechanism of existing gasbag-type leak stopper and lifesaving appliance is in order to obtain bigger top
Pin thrust, generally requires bigger arm of force working place, makes cam mechanism be not easily mounted at and wants space
In seeking higher cramped construction, and usually single use design, when reusing, cam is easy to wear,
Poor reliability.
Summary of the invention
It is an object of the invention to overcome the deficiency of above-mentioned technology, and a kind of offset cam formula air inlet is provided
The Optimization Design of controlling organization, by optimizing eccentric throw and thimble contact surface radius, maximum journey
Degree ground improve actuated by cams efficiency, it is achieved the function of little arm of force high-torque, save working place, make into
Gas control apparatus structure is compact, and improves reliability of structure.
The present invention for achieving the above object, by the following technical solutions: a kind of offset cam formula air inlet control
The Optimization Design of mechanism processed, is characterized in that: use cam and camshaft in the offset cam of one
Formula structure, drives thimble for linear motion along guide groove by cam curved surface, optimizes cam eccentric away from He Ding
Pin contact surface, makes cam curved surface drive thimble to meet thrust equivalence and unbalance loading homeostatic principle, it is achieved little
Arm of force high-torque function, it is simple to installing in narrow space, specific design scheme is as follows:
One. determine thimble range
1) camshaft cylindrical radius R1, cam base circle half is determined according to structure stress size and space requirement
Footpath R2, cam is eccentric, is set to plane at the beginning of thimble contact surface, and thimble cylindrical radius is undetermined；
2) heart is distributed by cam and thimble, makes cam AnchorPoint O, cam base circle center of circle O, cam bent
The center of circle, face O1It is distributed on same straight line, and cam base circle, cam curved surface, thimble contact plane phase
It is cut in an A；
3) cam curved surface promotes thimble contact plane to move downward, and contact point is slided into B by A, then point
Vertical distance between A and some B, i.e. thimble range L, determine cam curved surface radius R3, will
R1, R2, R3 are as known conditions, when cam angle scope is 0 °～90 °, make thimble maximum
Stroke L meets: L=R3-R2；When cam angle scope is 0 °～180 °, thimble range
For 2L；
Two. determine cam eccentric away from
1) as cam curved surface center of circle O1When the O half-twist of the cam base circle center of circle, make two center of circle OO1
Between distance be 2e, OO1The actual thimble axial line that perpendicular bisector is Biased momentum satellite, the most convex
The eccentric throw of wheel is e, e=L/2, and the vertical stroke of contact point is equal to thimble range L；
2) horizontal range between some A and some B is thimble contact plane minimum dimension, and even thimble connects
Contacting surface is plane, then thimble cylindrical radius palpus >=L/2；
3) two center of circle O, O1Between distance equal with thimble range L, by line segment OO1In hang down
Line as the thimble axial line position determined, then the eccentric throw of cam AnchorPoint O and thimble axial line
E=L/2；
Three. determine thimble subsequent corrosion
1) design thimble contact surface: thimble cylindrical radius is R4, and R4 ＜ L/2, then by 90 ° of positions
Thimble cylinder right hand edge line when putting extends upwardly to cam curved surface, and its intersection point is as contact surface limit on the right-right-hand limit
Position B, connects O1B also extends to thimble axial line, intersection point O2It is the thimble contact surface center of circle,
O2B is corresponding thimble contact surface radius R5, with O2For the center of circle, O2B is that radius makees circular arc, then
Circular arc between the line of thimble cylinder two edges is the actual thimble contact surface contacted with cam curved surface；
Or, thimble cylinder left hand edge line during 0 ° of position is extended upwardly to cam curved surface, as contact surface
Limit on the left position A, connects O1A also extends to thimble axial line, intersection point O2It is thimble contact surface
Center of circle O2A, O2A=O2B；
2) determine thimble contact surface radius R5 according to thimble cylindrical radius R4, make thimble contact surface
Tangent with cam curved surface, contact surface normal passes through cam curved surface center of circle O1With the thimble contact surface center of circle
O2；
Four. determine maximum pressure angle
When cam curved surface rotates to 90 ° around cam base circle O, thimble range is L, O1O2With top
The pressure angle that needle shaft heart line is formed is maximum, and for θ, the pressure angle corresponding when 0 ° is also θ；0 °～
In the range of 90 °, cam curved surface promotes thimble contact plane to move downward, and contact point is by original position A
Point slides into final position B point, reaches thimble range L, in the process, and O1O2With thimble
Axial line formed pressure angle all the time≤θ；When cam curved surface rotates to 180 ° around cam base circle O,
Thimble range is 2L, O1O2The pressure angle formed with thimble axial line is still θ, at 0 °～180
In the range of °, when cam curved surface promotes thimble descending, cam curved surface contacts with thimble contact surface
Point is slided into B point by starting point A, then is slid back to terminal A by B point, reaches range 2L, at this
During, O1O2With thimble axial line formed pressure angle all the time≤θ.
Beneficial effect: the Optimization Design of offset cam formula inlet control mechanism has the following characteristics that 1)
Curved surface-curved face contact can be made to obtain identical with curved surface-plane contact by optimizing thimble contact surface
Thrust, meets thrust equivalence principle, and thimble contact surface can be made to adapt to thimble cylindrical radius
Change, obtain rational thimble cylindrical radius size；2) select the most rational cam eccentric away from and top
Pin contact surface radius, makes pressure angle amplitude of variation minimum and symmetrical along thimble axial line, full
Foot unbalance loading homeostatic principle, at utmost reduces unbalance loading impact；3) meet little arm of force high-torque function and
Structural compactness requirement, makes cam mechanism be easy in narrow space install.
Accompanying drawing explanation
Fig. 1 a-Fig. 1 b is the offset cam formula air intake control method schematic diagram of embodiment；
Fig. 2 is that thimble range and cam eccentric are away from determining schematic diagram；
Fig. 3 is thimble subsequent corrosion and maximum pressure angle determines schematic diagram；
Fig. 4 is the schematic diagram of thrust equivalence principle；
Fig. 5 is the schematic diagram of unbalance loading homeostatic principle.
In figure: 1, cam, 2, camshaft, 3, thimble, 4, guide groove.
Detailed description of the invention
The detailed description of the invention of the present invention is described in detail below in conjunction with preferred embodiment.
Refer to accompanying drawing, the Optimization Design of a kind of offset cam formula inlet control mechanism, use cam 1
With the camshaft 2 offset cam formula structure in one, drive thimble 3 along guide groove 4 by cam curved surface
For linear motion, optimize cam eccentric away from thimble contact surface, make cam curved surface drive thimble meet
Thrust equivalence and unbalance loading homeostatic principle, it is achieved little arm of force high-torque function, it is simple to pacify in narrow space
Dress, specific design scheme is as follows:
One. determine thimble range
1) camshaft cylindrical radius R1, cam base circle half is determined according to structure stress size and space requirement
Footpath R2, cam is eccentric, is set to plane at the beginning of thimble contact surface, and thimble cylindrical radius is undetermined；
2) heart is distributed by cam and thimble, makes cam AnchorPoint O, cam base circle center of circle O, cam bent
The center of circle, face O1It is distributed on same straight line, and cam base circle, cam curved surface, thimble contact plane phase
It is cut in an A；
3) cam curved surface promotes thimble contact plane to move downward, and contact point is slided into B by A, then point
Vertical distance between A and some B, i.e. thimble range L, determine cam curved surface radius R3, will
R1, R2, R3 are as known conditions, when cam angle scope is 0 °～90 °, make thimble maximum
Stroke L meets: L=R3-R2；When cam angle scope is 0 °～180 °, thimble range
For 2L；
Two. determine cam eccentric away from
1) as cam curved surface center of circle O1When the O half-twist of the cam base circle center of circle, make two center of circle OO1
Between distance be 2e, OO1The actual thimble axial line that perpendicular bisector is Biased momentum satellite, the most convex
The eccentric throw of wheel is e, e=L/2, and the vertical stroke of contact point is equal to thimble range L；
2) horizontal range between some A and some B is thimble contact plane minimum dimension, and even thimble connects
Contacting surface is plane, then thimble cylindrical radius palpus >=L/2；
3) two center of circle O, O1Between distance equal with thimble range L, by line segment OO1In hang down
Line as the thimble axial line position determined, then the eccentric throw of cam AnchorPoint O and thimble axial line
E=L/2；
Three. determine thimble subsequent corrosion
1) design thimble contact surface: thimble cylindrical radius is R4, and R4 ＜ L/2, then by 90 ° of positions
Thimble cylinder right hand edge line when putting extends upwardly to cam curved surface, and its intersection point is as contact surface limit on the right-right-hand limit
Position B, connects O1B also extends to thimble axial line, intersection point O2It is the thimble contact surface center of circle,
O2B is corresponding thimble contact surface radius R5, with O2For the center of circle, O2B is that radius makees circular arc, then
Circular arc between the line of thimble cylinder two edges is the actual thimble contact surface contacted with cam curved surface；
Or, thimble cylinder left hand edge line during 0 ° of position is extended upwardly to cam curved surface, as contact surface
Limit on the left position A, connects O1A also extends to thimble axial line, intersection point O2It is thimble contact surface
Center of circle O2A, O2A=O2B；
2) determine thimble contact surface radius R5 according to thimble cylindrical radius R4, make thimble contact surface
Tangent with cam curved surface, contact surface normal passes through cam curved surface center of circle O1With the thimble contact surface center of circle
O2；
Four. determine maximum pressure angle
When cam curved surface rotates to 90 ° around cam base circle O, thimble range is L, O1O2With top
The pressure angle that needle shaft heart line is formed is maximum, and for θ, the pressure angle corresponding when 0 ° is also θ；0 °～
In the range of 90 °, cam curved surface promotes thimble contact plane to move downward, and contact point is by original position A
Point slides into final position B point, reaches thimble range L, in the process, and O1O2With thimble
Axial line formed pressure angle all the time≤θ；When cam curved surface rotates to 180 ° around cam base circle O,
Thimble range is 2L, O1O2The pressure angle formed with thimble axial line is still θ, at 0 °～180
In the range of °, when cam curved surface promotes thimble descending, cam curved surface contacts with thimble contact surface
Point is slided into B point by starting point A, then is slid back to terminal A by B point, reaches range 2L, at this
During, O1O2With thimble axial line formed pressure angle all the time≤θ.
5 operation principles
1) thrust equivalence principle
When thimble contact surface is curved surface, by appropriate design subsequent corrosion, can obtain contacting with thimble
Thrust identical when face is plane, and thimble cylindrical radius can be less, it is easier to meet little space
Design requirement.
When thimble contact surface is plane, thimble thrust
When thimble contact surface is curved surface, thimble thrust
Therefore, the cam mechanism of this method design, the thrust size that thimble obtains is with maximum pressure angle θ's
Size is unrelated, as long as contact normal is by center of circle O1O2, then thimble contact surface either plane is still
Curved surface, the thrust that thimble obtains is the most equal, i.e. both thrust equivalences.
2) unbalance loading homeostatic principle
With compared with core type, offset cam can select the most rational eccentric throw and contact surface radius,
Make pressure angle minimum, reduce unbalance loading impact.
During biasing, as cam curved surface center of circle O1Around camshaft AnchorPoint O 0 °～90 ° of scope inward turnings
Turning, corresponding contact point slides between A ' and B ', and active force is distributed on the right side of thimble axial line,
Big side force F2x=F2·tanθ1；
During to the heart, as cam curved surface center of circle O1Around camshaft AnchorPoint O 0 °～90 ° of scope inward turnings
Turning, corresponding contact point slides between A and B, active force along the symmetrical distribution of thimble axial line,
Maximum lateral force F1x=F1·tanθ；
Because,
θ1＞ 2 θ, as θ ＜ 45 °, tan θ1＞ tan2 θ ＞ 2tan θ
Then F2x＞ 2F1x
So the thrust of thimble is more equalized by Biased momentum satellite comparison cardiac prominence wheel mechanism, and bias convex
The offset loading force that wheel mechanism produces is less than the half to the offset loading force that cardiac prominence wheel mechanism produces.
Above-mentioned with reference to the embodiment Optimization Design to this kind of offset cam formula inlet control mechanism
The detailed description carried out, is illustrative rather than determinate, can according to restriction scope list
Several embodiments, therefore changing and modifications under without departing from present general inventive concept, should belong to this
Within bright protection domain.
Claims (1)
1. an Optimization Design for offset cam formula inlet control mechanism, is characterized in that: use
Cam and the camshaft offset cam formula structure in one, drive thimble to make along guide groove by cam curved surface
Linear motion, optimize cam eccentric away from thimble contact surface, make cam curved surface drive thimble meet push away
Power equivalence and unbalance loading homeostatic principle, it is achieved little arm of force high-torque function, it is simple to install in narrow space,
Specific design scheme is as follows:
One. determine thimble range
1) camshaft cylindrical radius R1, cam base circle half is determined according to structure stress size and space requirement
Footpath R2, cam is eccentric, is set to plane at the beginning of thimble contact surface, and thimble cylindrical radius is undetermined；
2) heart is distributed by cam and thimble, makes cam AnchorPoint O, cam base circle center of circle O, cam bent
The center of circle, face O1It is distributed on same straight line, and cam base circle, cam curved surface, thimble contact plane phase
It is cut in an A；
3) cam curved surface promotes thimble contact plane to move downward, and contact point is slided into B by A, then point
Vertical distance between A and some B, i.e. thimble range L, determine cam curved surface radius R3, will
R1, R2, R3 are as known conditions, when cam angle scope is 0 °～90 °, make thimble maximum
Stroke L meets: L=R3-R2；When cam angle scope is 0 °～180 °, thimble range
For 2L；
Two. determine cam eccentric away from
1) as cam curved surface center of circle O1When the O half-twist of the cam base circle center of circle, make two center of circle OO1
Between distance be 2e, OO1The actual thimble axial line that perpendicular bisector is Biased momentum satellite, the most convex
The eccentric throw of wheel is e, e=L/2, and the vertical stroke of contact point is equal to thimble range L；
2) horizontal range between some A and some B is thimble contact plane minimum dimension, and even thimble connects
Contacting surface is plane, then thimble cylindrical radius palpus >=L/2；
3) two center of circle O, O1Between distance equal with thimble range L, by line segment OO1In hang down
Line as the thimble axial line position determined, then the eccentric throw of cam AnchorPoint O and thimble axial line
E=L/2；
Three. determine thimble subsequent corrosion
1) design thimble contact surface: thimble cylindrical radius is R4, and R4 ＜ L/2, then by 90 ° of positions
Thimble cylinder right hand edge line when putting extends upwardly to cam curved surface, and its intersection point is as contact surface limit on the right-right-hand limit
Position B, connects O1B also extends to thimble axial line, intersection point O2It is the thimble contact surface center of circle,
O2B is corresponding thimble contact surface radius R5, with O2For the center of circle, O2B is that radius makees circular arc, then
Circular arc between the line of thimble cylinder two edges is the actual thimble contact surface contacted with cam curved surface；
Or, thimble cylinder left hand edge line during 0 ° of position is extended upwardly to cam curved surface, as contact surface
Limit on the left position A, connects O1A also extends to thimble axial line, intersection point O2It is thimble contact surface
Center of circle O2A, O2A=O2B；
2) determine thimble contact surface radius R5 according to thimble cylindrical radius R4, make thimble contact surface
Tangent with cam curved surface, contact surface normal passes through cam curved surface center of circle O1With the thimble contact surface center of circle
O2；
Four. determine maximum pressure angle
When cam curved surface rotates to 90 ° around cam base circle O, thimble range is L, O1O2With top
The pressure angle that needle shaft heart line is formed is maximum, and for θ, the pressure angle corresponding when 0 ° is also θ；0 °～
In the range of 90 °, cam curved surface promotes thimble contact plane to move downward, and contact point is by original position A
Point slides into final position B point, reaches thimble range L, in the process, and O1O2With thimble
Axial line formed pressure angle all the time≤θ；When cam curved surface rotates to 180 ° around cam base circle O,
Thimble range is 2L, O1O2The pressure angle formed with thimble axial line is still θ, at 0 °～180
In the range of °, when cam curved surface promotes thimble descending, cam curved surface contacts with thimble contact surface
Point is slided into B point by starting point A, then is slid back to terminal A by B point, reaches range 2L, at this
During, O1O2With thimble axial line formed pressure angle all the time≤θ.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610347722.3A CN105808897B (en) | 2016-05-23 | 2016-05-23 | The design method of offset cam formula inlet control mechanism |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610347722.3A CN105808897B (en) | 2016-05-23 | 2016-05-23 | The design method of offset cam formula inlet control mechanism |
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| CN105808897A true CN105808897A (en) | 2016-07-27 |
| CN105808897B CN105808897B (en) | 2019-06-18 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107285060A (en) * | 2017-06-02 | 2017-10-24 | 浙江大学宁波理工学院 | Pulsed Chu Fen mechanisms |
| CN108216799A (en) * | 2017-11-30 | 2018-06-29 | 上海东富龙科技股份有限公司 | The optimization of cam and modeling method in a kind of bottle placer cam transport mechanism |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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|---|---|
| CN105808897B (en) | 2019-06-18 |
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