CN106439003B - A kind of lightweight piston bar - Google Patents
A kind of lightweight piston bar Download PDFInfo
- Publication number
- CN106439003B CN106439003B CN201610846109.6A CN201610846109A CN106439003B CN 106439003 B CN106439003 B CN 106439003B CN 201610846109 A CN201610846109 A CN 201610846109A CN 106439003 B CN106439003 B CN 106439003B
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- Prior art keywords
- arc
- rod
- slot
- piston
- lightweight
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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 kind of lightweight piston bars, including the body of rod and the piston at the body of rod both ends is set, the body of rod is that section is in criss-cross cylinder, its side is axially and symmetrically opened up along the body of rod there are four concave arc slot, the body of rod length is 90mm, the circumscribed diameter of a circle in its section is 10mm, the concave arc slot is made of the arc-shaped transition slot of intermediate arc groove and both ends, wherein the flute length of the arc groove is 50mm, groove width is 5mm, groove depth is 1.5mm, and arc radius R7, the notch and slot bottom of the arc-shaped transition slot are arcuate structure.The present invention provides a kind of lightweight piston bars, optimize to the structure of piston rod, its weight is greatly reduced under the premise of not reducing its function, quality and service life.
Description
Technical field
The present invention relates to piston rods, and in particular to a kind of lightweight piston bar.
Background technique
Gas operated automatic rifle refer to using opened on barrel the method for side opening by the partial high pressure powder gas in thorax by
Gas port import gas chamber, push automatic machine basic component carry out recoil movement, when recoil in place after, under the action of counterrecoil mechanism
It is multiple into, basic component recoil and it is multiple into during, pass through the transmission of mechanism, complete automatic cycle.Automatic weapon is laterally led
Device of air refers to that the part powder gases using the lateral gas port outflow of barrel complete the device of certain work, uses earliest
Lateral gas operated device is that the gas operated device of the gas weapons of motive power is provided for automatic weapon automatic machine.With automatic weapon
Continuous development, using powder gases derived from side opening complete function it is more and more, the structure type of gas operated device is multiple more
Sample, but their aerodynamic force process is essentially identical.
The chief component of the gas operated device of automatic rifle has: gas port, air guide room, piston etc..With certain automatic rifle
For, the piston rod quality of gas operated device is about 260g, and wherein the material of piston is 40Cr.
Piston rod is a motion ratio more frequently element in mechanical organ, is generally connect with power device, its use
Service life often determines the service life of whole part, and bearing capacity, impact strength, fatigue life are to consider making for piston rod
With the important indicator in service life, in addition, the Design of length of piston rod depends on unstability beaming limit, for weapon,
Guarantee its function, quality and under the premise of the service life, every one gram of reduction is all had a very important significance.
Summary of the invention
To overcome the shortcomings of existing technologies, the present invention provides a kind of lightweight piston bars, carry out to the structure of piston rod
Optimization, greatly reduces its weight under the premise of not reducing its function, quality and service life.
Present invention discloses a kind of lightweight piston bars, including the body of rod and are arranged in the piston at the body of rod both ends, institute
Stating the body of rod is section in criss-cross cylinder, and side axially and symmetrically opens up that there are four concave arc slot, the body of rod length along the body of rod
For 90mm, the circumscribed diameter of a circle in section is 10mm, and the concave arc slot is by intermediate arc groove and the arc-shaped transition slot group at both ends
At wherein the flute length of the arc groove is 50mm, groove width 5mm, groove depth 1.5mm, arc radius R7, the arc-shaped transition
The notch and slot bottom of slot are arcuate structure, and arc-shaped transition slot longitudal section is mapped in coordinate system, and setting slot bottom one end is circle
Point O, the axis perpendicular to slot bottom are Y-axis, and the curvilinear equation at arc 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 the concave arc slot and the body of rod have the chamfering of R0.5.
With the chamfering of R2 between the body of rod and the piston at both ends.
Compared with prior art, a kind of lightweight piston bar of the invention is symmetrically opened up in body of rod side there are four concave arc
Slot can greatly mitigate the weight of piston rod, shape concave arc slot being designed in attached drawing, it is ensured that its function, quality
It is consistent with cylindrical piston bar with the service life.
Detailed description of the invention
Fig. 1 is the structural perspective of existing former piston rod；
Fig. 2 is the structural perspective of lightweight piston bar of the invention；
Fig. 3 is the main view of lightweight piston bar of the invention；
Fig. 4 is the exploded view of concave arc slot of the present invention；
Fig. 5 is lightweight piston bar view in transverse section of the invention；
Fig. 6 is arc-shaped transition slot longitudal section mapping point figure of the present invention.
Specific embodiment
Below in conjunction with attached drawing of the invention, clear, complete description is carried out to the technical solution of the embodiment of the present invention.
It is as shown in Figure 1 existing lightweight piston bar comprising the body of rod of cylindrical body and body of rod both ends are set
Piston 2.
As shown in Figure 2-5, disclosed a kind of lightweight piston bar is, institute with difference in the prior art
Stating the body of rod 1 is section in criss-cross cylinder, and side is axially and symmetrically opened up along the body of rod there are four concave arc slot 3, and the body of rod is long
Degree is 90mm, and the circumscribed diameter of a circle in section is 10mm, and 2 diameter of piston is 13mm.
Particularly, the concave arc slot 3 is made of the arc-shaped transition slot 5 of intermediate arc groove 4 and both ends, wherein arc groove
Flute length be 50mm, groove width 5mm, groove depth 1.5mm, arc radius be R7 (as seen from Figure 5), set the body of rod axis
It is that laterally, the arc-shaped transition slot longitudinal cutting face is as shown in fig. 6, wherein camber line AB with axially vertical direction to being longitudinal
For slot bottom, camber line BC is notch, and the cross section of arc-shaped transition slot in Fig. 6 is mapped in coordinate system, sets A point as dot O, hangs down
Directly in the axis of slot bottom as Y-axis, wherein the curvilinear equation of camber line AB is y=0.0073x2- 0.0024x, the curve side of camber line BC
Journey is y=0.0045x2-0.0018x+0.58。
The notch side of the concave arc slot and the body of rod have the chamfering of R0.5, to avoid stress concentration, while also avoiding assembling
When scratch worker, between the body of rod both ends and piston with R2 chamfering, avoid stress from concentrating.
The performance of the body of rod is verified using specific data operation below:
Bearing capacity is checked
Using certain automatic rifle as references object, the inner trajectory data obtained according to interior ballistic calculation are as follows: bullet is by leading
Average pressure is 57MPa in thorax when the gas of hole, and average pressure is 37MPa in thorax when bullet goes out thorax, and piston rod material therefor is
40Cr, its yield strength σ s are 785MPa, the safety coefficient n of the piston rod after lightweightkIt is 2, its allowable stress is by formula
(1) it acquires as 392.5MPa.
Former piston rod head (piston rod head diameter is 13mm) sectional area is 132.7mm2, (gauge diameter is bar portion
10mm) sectional area is 78.54mm2.Two head sectional area of piston rod after lightweight is constant, is still 132.7mm2, bar portion sectional area
It is reduced to 56.71mm2, after lightweight, since 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.It is cut in addition, piston rod minimum is calculated according to formula (3)
Face area FminFor 19.27mm2, and the bar portion sectional area of lightweight piston bar is 56.71mm2, 19.27 are much larger than, is met the requirements.
[σ]=σ s/nk (1)
The allowable stress of [σ] -40Cr, MPa in formula；
The yield strength of σ s-40Cr, MPa；
nkSafety coefficient.
σ in formulaBarStress suffered by piston rod, MPa；
σHeadStress suffered by piston crown is 57MPa；
SHeadPiston head stress surface surface area, mm2；
SBar portionPiston rod cross-sections surfaces product, mm2。
Fmin≥Fp/[σ] (3)
F in formulaminMinimum cross-sectional area, mm2；
FpLongitudinal gross pressure, N；
The allowable stress of [σ] -40Cr, MPa.
Stability is checked
When piston rod is by axial compression load, value F is more than a certain critical value Fk, stabilization will be lost.Piston rod it is steady
It is qualitative to be checked as the following formula.
N in formulakSafety coefficient, the minimum safety factor that analytical calculation obtains the cross piston rod after lightweight is 2.0.
When the slenderness ratio of piston rodWhen
When the slenderness ratio of piston rodWhen
L- installation length in formula, mm；
rkThe cross section of the piston rod least radius of gyration,
ψ1Ratio of slenderness is medium carbon steel according to 40Cr, takes ψ1=85；
ψ2The end coefficient determined by supporting way, takes ψ2=4；
The elasticity modulus of E- piston rod material takes E=2.06 × 10 to 40Cr11Pa；
J- cross section of the piston rod the moment of inertia, being gone out by strength analysis calculation is 274.57mm4；
A- cross section of the piston rod product 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
F is finally 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 comparison before and after lightweight
Mechanics and strength analysis calculation based on finite element, the maximum for obtaining cylindrical piston bar by analytical calculation is comprehensive to be become
Shape amount is 0.0385mm, and the maximum deformation quantity of the cross piston rod after optimization is 0.0391mm.Therefore it is not only able to satisfy
Unstability requires (bending strength), and only increases 0.0006mm than deflection before loss of weight.Finish forge blank can be used in the processing of the slot,
Profile milling cutter processes four slots respectively.Middle section straight-line feed, two ends are fed by the curvilinear equation trajectory line of camber line AB, i.e., processable
The slot out.
Technology contents and technical characteristic of the invention have revealed that as above, however those skilled in the art still may base
Make various replacements and modification without departing substantially from spirit of that invention in announcement of the invention, therefore, the scope of the present invention is answered unlimited
It in the revealed content of embodiment, and should include various without departing substantially from replacement and modification of the invention, and be present patent application right
It is required that being covered.
Claims (3)
1. a kind of lightweight piston bar, is mounted in the gas operated device of automatic rifle, including the body of rod and setting are in the body of rod
The piston at both ends, it is characterised in that: the body of rod is that section is in criss-cross cylinder, and side is axially and symmetrically offered along the body of rod
Four concave arc slots, the body of rod length are 90mm, and the circumscribed diameter of a circle in section is 10mm, and the concave arc slot is by intermediate circular arc
Slot and the arc-shaped transition slot at both ends composition, wherein the flute length of the arc groove is 50mm, groove width 5mm, groove depth 1.5mm, circle
Arc radius is R7, and the notch and slot bottom of the arc-shaped transition slot are arcuate structure, and arc-shaped transition slot longitudal section is mapped to seat
In mark system, setting slot bottom one end is dot O, and the axis perpendicular to slot bottom is Y-axis, and the curvilinear equation at arc groove bottom is y=
0.0073x2- 0.0024x, the curvilinear equation of arc-shaped slot are 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 the concave arc slot and the body of rod
Chamfering with R0.5.
3. a kind of lightweight piston bar according to claim 1, it is characterised in that: between the body of rod and the piston at both ends
Chamfering with 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 |
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| Publication Number | Publication Date |
|---|---|
| CN106439003A CN106439003A (en) | 2017-02-22 |
| CN106439003B true CN106439003B (en) | 2019-01-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610846109.6A Active CN106439003B (en) | 2016-09-23 | 2016-09-23 | A kind of lightweight piston bar |
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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 |
|---|---|
| CN106439003A (en) | 2017-02-22 |
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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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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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