CN106439003A - Lightweight piston rod - Google Patents
Lightweight piston rod Download PDFInfo
- Publication number
- CN106439003A CN106439003A CN201610846109.6A CN201610846109A CN106439003A CN 106439003 A CN106439003 A CN 106439003A CN 201610846109 A CN201610846109 A CN 201610846109A CN 106439003 A CN106439003 A CN 106439003A
- Authority
- CN
- China
- Prior art keywords
- groove
- rod
- arc
- piston rod
- lightweight
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J7/00—Piston-rods
Abstract
The invention discloses a lightweight piston rod. The lightweight piston rod comprises a rod body and pistons arranged at the two ends of the rod body. The rod body is a cylinder with the cross-shaped section, and four concave arc grooves are symmetrically formed in the side face of the rod body in the axial direction of the rod body. The length of the rod body is 90 mm, and the diameter of the excircle of the section of the rod body is 10 mm. Each concave arc groove is composed of a middle circular arc groove and arc transition grooves in the two ends, wherein the groove length of the circular arc groove is 50 mm, the groove width is 5 mm, the groove depth is 1.5 mm, the circular arc radius is R7, and groove openings and groove bottoms of the arc transition grooves are of an arc structure. According to the lightweight piston rod, the structure of the piston rod is optimized, and the weight of the piston rod is greatly reduced on the premise that the functions and the quality of the piston rod are not reduced, and the service life of the piston rod is not shortened.
Description
Technical field
The present invention relates to piston rod is and in particular to a kind of lightweight piston bar.
Background technology
Gas operated automatic rifle refer to using open on barrel the method for side opening by the partial high pressure powder gas in thorax by
Gas port imports air chamber, promotes automat basic component to carry out recoil motion, after recoil puts in place, in the presence of counterrecoil mechanism
Multiple enter, basic component recoil and multiple enter during, by the transmission of mechanism, complete Automatic Cycle.Automatic weapon is laterally led
Device of air refers to that the part powder gases flowing out using the lateral gas port of barrel complete the device of certain work, uses earliest
Lateral gas operated device, is the gas operated device providing motive gas weapons for automatic weapon automat.With automatic weapon
Continuous development, got more and more using the function that completes of powder gases that side opening is derived, the version of gas operated device is multiple many
Sample, but their aerodynamic force process is essentially identical.
The key component of the gas operated device of automatic rifle has：Gas port, inducing QI room, piston etc..With certain automatic rifle
As a example, the piston rod quality of gas operated device is about 260g, and the wherein material of piston is 40Cr.
Piston rod is a motion ratio more frequently element in mechanical organ, is typically connected with power set, its use
Life-span often determines the service life of whole part, and bearing capacity, impact strength, fatigue life are to consider making of piston rod
With the important indicator in life-span, additionally, the Design of length of piston rod depends on unstability beaming limit, for weapon,
Ensure its function, quality and on the premise of the life-span, it often reduces one gram and all have and is of great significance.
Content of the invention
For overcoming the defect of prior art, the invention provides a kind of lightweight piston bar, the structure of piston rod is carried out
Optimize, do not reducing its function, quality and on the premise of the life-span, greatly reducing its weight.
Present invention is disclosed a kind of lightweight piston bar, including the body of rod and the piston that is arranged on described body of rod two ends, institute
Stating the body of rod for section is in criss-cross cylinder, and its side offers four concave arc grooves, described body of rod length along the body of rod is axially symmetric
For 90mm, the circumscribed a diameter of 10mm in its section, described concave arc groove is by the arc-shaped transition groove group at middle arc groove and two ends
Become, the flute length of wherein said arc groove is 50mm, and groove width is 5mm, and groove depth is 1.5mm, and arc radius are R7, described arc-shaped transition
The notch of groove and bottom land are arcuate structure, and arc-shaped transition groove longitudinal section is mapped in coordinate system, and setting slot bottom one end is circle
Point O, is Y-axis perpendicular to the axle of bottom land, and the curvilinear equation at arcuate groove bottom is y=0.0073x2- 0.0024x, the song of arc-shaped slot
Line equation is y=0.0045x2-0.0018x+0.58.
The notch side of described concave arc groove and the body of rod have the chamfering of R0.5.
There is between the described body of rod and the piston at two ends the chamfering of R2.
Compared with prior art, a kind of lightweight piston bar of the present invention, symmetrically offers four concave arcs in body of rod side
Groove, can greatly mitigate the weight of piston rod, concave arc groove is designed to shape in accompanying drawing it is ensured that its function, quality
Consistent with cylindrical piston bar with the life-span.
Brief description
Fig. 1 is the structural perspective of existing former piston rod；
Fig. 2 is the structural perspective of the lightweight piston bar of the present invention；
Fig. 3 is the front view of the lightweight piston bar of the present invention；
Fig. 4 is the exploded view of concave arc groove of the present invention；
Fig. 5 is the lightweight piston bar view in transverse section of the present invention；
Fig. 6 is arc-shaped transition groove longitudinal section mapping point figure of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing of the present invention, clear, complete description is carried out to the technical scheme of the embodiment of the present invention.
It is illustrated in figure 1 existing lightweight piston bar, it includes the cylindrical body of rod and is arranged on body of rod two ends
Piston 2.
As shown in Figure 2-5, a kind of disclosed lightweight piston bar, is with difference of the prior art, institute
Stating the body of rod 1 for section is in criss-cross cylinder, and its side offers four concave arc grooves 3 along the body of rod is axially symmetric, and the described body of rod is long
Spend for 90mm, the circumscribed a diameter of 10mm in its section, a diameter of 13mm of described piston 2.
Particularly, described concave arc groove 3 is made up of the arc-shaped transition groove 5 of middle arc groove 4 and two ends, wherein arc groove
Flute length be 50mm, groove width be 5mm, groove depth be 1.5mm, arc radius be R7 (as seen from Figure 5), set described body of rod axle
To for longitudinal direction, it is horizontal with axially vertical direction, described arc-shaped transition groove longitudinal cutting face is as shown in fig. 6, its mean camber line AB
For bottom land, camber line BC is notch, the cross section of arc-shaped transition groove in Fig. 6 is mapped in coordinate system, sets A point as round dot O, hangs down
As Y-axis, the curvilinear equation of its mean camber line AB is y=0.0073x to the straight axle in bottom land2- 0.0024x, the curve side of camber line BC
Journey is y=0.0045x2-0.0018x+0.58.
The notch side of described concave arc groove and the body of rod have the chamfering of R0.5, to avoid stress concentration, also avoid assembling simultaneously
When scratch workman, there is the chamfering of R2, it is to avoid stress concentration between described body of rod two ends and piston.
Using concrete data operation, the performance of the body of rod is verified below：
Bearing capacity is checked
With certain automatic rifle as references object, as follows according to the inner trajectory data that interior ballistic calculation obtains：Bullet is through leading
In thorax during the gas of hole, average pressure is 57MPa, and in the thorax that bullet goes out during thorax, average pressure is 37MPa, and piston rod material therefor is
40Cr, its yield strength σ s are 785MPa, safety coefficient n of the piston rod after lightweightkFor 2, its allowable stress is by formula
(1) try to achieve as 392.5MPa.
Former piston rod head (a diameter of 13mm of piston rod head) sectional area is 132.7mm2, (gauge diameter is bar portion
10mm) sectional area is 78.54mm2.Piston rod two head sectional area after lightweight is constant, still for 132.7mm2, bar portion sectional area
It is reduced to 56.71mm2, after lightweight, because area reduces, piston rod bar portion stress is calculated as 133.4MPa by formula (2), still far
Allowable stress 392.5MPa less than 40Cr, therefore meet intensity requirement.Additionally, being calculated according to formula (3), piston rod is minimum to be cut
Face area FminFor 19.27mm2, and the bar portion sectional area of lightweight piston bar is 56.71mm2, much larger than 19.27, meet and require.
[σ]=σ s/nk(1)
The allowable stress of [σ] -40Cr, MPa in formula；
The yield strength of σ s-40Cr, MPa；
nk- safety coefficient.
σ in formulaBarStress suffered by-piston rod, MPa；
σHeadStress suffered by-piston crown, is 57MPa；
SHead- piston head stress surface surface area, mm2；
SBar portion- piston rod cross-sections surfaces are amassed, mm2.
Fmin≥Fp/[σ] (3)
F in formulamin- minimum cross-sectional area, mm2；
Fp- longitudinal gross pressure, N；
The allowable stress of [σ] -40Cr, MPa.
Stability is checked
When piston rod is subject to axial compression load, its value F exceedes a certain marginal value Fk, will lose stable.Piston rod steady
Qualitative checked as the following formula.
N in formulak- safety coefficient, the minimum safety factor that analytical calculation obtains the cross piston rod after lightweight is 2.0.
Slenderness ratio when piston rodWhen
Slenderness ratio when piston rodWhen
L- installation length in formula, mm；
rk- piston rod cross section the least radius of gyration,
ψ1- ratio of slenderness, is medium carbon steel according to 40Cr, takes ψ1=85；
ψ2- end the coefficient that determined by supporting way, takes ψ2=4；
The elastic modelling quantity of E- piston rod material, to 40Cr, takes E=2.06 × 1011Pa；
J- piston rod moment of inertia of cross-section, is gone out for 274.57mm by strength analysis calculation4；
A- piston rod cross-sectional area, is 56.71mm2；
The experiment value that f- is determined by the strength of materials, is 490MPa；
α-coefficient, is medium carbon steel according to 40Cr, takes
Finally F is calculated to obtain by formula (5)k=27787.9N, substitutes into formula (3) and obtainsThen compressive load F=
7562N, is less thanMeet stability requirement.
Deflection contrast before and after lightweight
Mechanics based on finite element and strength analysis calculation, obtain the maximum comprehensive of cylindrical piston bar by analytical calculation and become
Shape amount is 0.0385mm, and the maximum deformation quantity of the cross piston rod after optimization is 0.0391mm.Therefore, can not only meet
Unstability requires (bending strength), and only increases 0.0006mm than deflection before loss of weight.The processing of this groove, can adopt finish forge blank,
Profile milling cutter processes four grooves respectively.Stage casing straight-line feed, the curvilinear equation trajectory feeding of camber line AB is pressed at two ends, you can processing
Go out this groove.
The technology contents of the present invention and technical characteristic have revealed that as above, but those of ordinary skill in the art still may base
Make a variety of replacements without departing substantially from spirit of the present invention and modification in the announcement of the present invention, therefore, the scope of the present invention should not limit
Content disclosed in embodiment, and the various replacements without departing substantially from the present invention and modification should be included, and be present patent application right
Require to be covered.
Claims (3)
1. a kind of lightweight piston bar, including the body of rod and the piston that is arranged on described body of rod two ends it is characterised in that：Described bar
Body is in criss-cross cylinder for section, and its side offers four concave arc grooves along the body of rod is axially symmetric, and described body of rod length is
90mm, the circumscribed a diameter of 10mm in its section, described concave arc groove is made up of the arc-shaped transition groove at middle arc groove and two ends,
The flute length of wherein said arc groove is 50mm, and groove width is 5mm, and groove depth is 1.5mm, and arc radius are R7, described arc-shaped transition groove
Notch and bottom land be arcuate structure, arc-shaped transition groove longitudinal section is mapped in coordinate system, setting slot bottom one end be round dot
O, is Y-axis perpendicular to the axle of bottom land, and the curvilinear equation at arcuate groove bottom is y=0.0073x2- 0.0024x, the curve of arc-shaped slot
Equation is y=0.0045x2-0.0018x+0.58.
2. a kind of lightweight piston bar according to claim 1 it is characterised in that：The notch side of described concave arc groove and the body of rod
There is the chamfering of R0.5.
3. a kind of lightweight piston bar according to claim 1 it is characterised in that：Between the described body of rod and the piston at two ends
There is the chamfering of R2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610846109.6A CN106439003B (en) | 2016-09-23 | 2016-09-23 | A kind of lightweight piston bar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610846109.6A CN106439003B (en) | 2016-09-23 | 2016-09-23 | A kind of lightweight piston bar |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106439003A true CN106439003A (en) | 2017-02-22 |
| CN106439003B CN106439003B (en) | 2019-01-08 |
Family
ID=58166437
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610846109.6A Active CN106439003B (en) | 2016-09-23 | 2016-09-23 | A kind of lightweight piston bar |
Country Status (1)
| Country | Link |
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| CN (1) | CN106439003B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101290022A (en) * | 2008-06-13 | 2008-10-22 | 中色科技股份有限公司 | Hydraulic cylinder design and device for centering deviation-rectifying system |
| CN201581632U (en) * | 2009-10-21 | 2010-09-15 | 宋佩瑜 | Key connection steel pipe scaffold additionally provided with annular sleeves |
| CN103960213A (en) * | 2014-05-08 | 2014-08-06 | 刘政 | Quadrangle and diamond integrated floating pole |
| CN104265714A (en) * | 2014-10-09 | 2015-01-07 | 平原机器厂（新乡） | Piston actuator and automatic reversing valve thereof |
| CN104323814A (en) * | 2014-11-27 | 2015-02-04 | 李洪湘 | Push expansion type ring device |
-
2016
- 2016-09-23 CN CN201610846109.6A patent/CN106439003B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101290022A (en) * | 2008-06-13 | 2008-10-22 | 中色科技股份有限公司 | Hydraulic cylinder design and device for centering deviation-rectifying system |
| CN201581632U (en) * | 2009-10-21 | 2010-09-15 | 宋佩瑜 | Key connection steel pipe scaffold additionally provided with annular sleeves |
| CN103960213A (en) * | 2014-05-08 | 2014-08-06 | 刘政 | Quadrangle and diamond integrated floating pole |
| CN104265714A (en) * | 2014-10-09 | 2015-01-07 | 平原机器厂（新乡） | Piston actuator and automatic reversing valve thereof |
| CN104323814A (en) * | 2014-11-27 | 2015-02-04 | 李洪湘 | Push expansion type ring device |
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| Publication number | Publication date |
|---|---|
| CN106439003B (en) | 2019-01-08 |
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Effective date of registration: 20200320 Address after: 226019 Jiangsu city of Nantong province sik Road No. 9 Patentee after: Center for technology transfer, Nantong University Address before: 226000 Jiangsu city of Nantong province sik Road No. 9 Patentee before: NANTONG University |
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| TR01 | Transfer of patent right |
Effective date of registration: 20200619 Address after: 226600 Zhennan Road 428, Haian High-tech Zone, Nantong City, Jiangsu Province (formerly Haian Town) Patentee after: Nantong doctoral innovation technology transfer Co.,Ltd. Address before: 226019 Jiangsu city of Nantong province sik Road No. 9 Patentee before: Center for technology transfer, Nantong University |
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