CN101725588A - Hydraulic cylinder with clearance sealed type deformed piston - Google Patents
Hydraulic cylinder with clearance sealed type deformed piston Download PDFInfo
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- CN101725588A CN101725588A CN200910272743A CN200910272743A CN101725588A CN 101725588 A CN101725588 A CN 101725588A CN 200910272743 A CN200910272743 A CN 200910272743A CN 200910272743 A CN200910272743 A CN 200910272743A CN 101725588 A CN101725588 A CN 101725588A
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Abstract
The invention particularly relates to a hydraulic cylinder with a clearance sealed type deformed piston, which adopts the following technical scheme that: an excircle of a piston [5] is uniformly and symmetrically provided with 3 to 5 balance slots [6]; a piston rod [18] of the piston [5] is provided with a first seal groove [7]; an annular boss of which the outer diameter is the same as that of the piston [5] is arranged on the end faces of two sides of the piston [5] respectively; an excircle of a guide sleeve [11] is provided with a second seal groove [16]; a first drain pan [14] and a second drain pan [17] are arranged on an inner circle and the excircle of the guide sleeve [11] respectively; the first drain pan [14] is communicated with the second drain pan [17] through a second oil drain channel [13]; the second drain pan [17] is communicated with a first oil drain channel [12] arranged on a cylinder body [1]; and an end face, close to the inner circle, of the inner side of the guide sleeve [11] is provided with am annular groove. The hydraulic cylinder has the characteristics of simple structure, convenient assembly and disassembly and maintenance, long service life, small friction, high frequency response, high reliability, external leakage prevention, and the like.
Description
Technical field
The invention belongs to the oil hydraulic cylinder technical field.Relate in particular to a kind of hydraulic cylinder with clearance sealed type deformed piston.
Background technique
Oil hydraulic cylinder especially servo hydraulic cylinder require frictional force low, do not have creep, the frequency response height, the life-span is long, reliability is high, to satisfy quiet, the dynamic performance requirement of Hydrauservo System.So, seal form between piston and the cylinder body and material selection, and the guide sleeve design is all very important with selecting for use of sealing material.
What application was comparatively successful at present is to adopt the nonmetallic material ring of square or rectangular cross-section and the rubber and plastic composite sealing ring that O shape rubber ring is formed one, and it has good wear resistance, oil resistance and heat resistance, and friction factor is little.But a supporting ring respectively is equipped with in its assembly technology complexity, seal ring both sides, has increased frictional force, influences the oil hydraulic cylinder dynamic characteristic.
At present, in some Hydrauservo Systems, require the oil hydraulic cylinder of low-frictional force, fast response and hydraulic element all to wish to cancel seal ring and adopt the clearance seal form.Clearance seal has the thin oil film of one deck in the gap, kinematic pair is played lubrication, helps reducing frictional force, improves dynamic performance.And it is extremely important to control its seal clearance amount, if excesssive gap leaks increase; The gap is too small, and cylinder barrel internal surface easily weares and teares.Oil hydraulic cylinder at work because the gap is certain, leakage rate raises with pressure reduction and increases.Therefore, wayward gap and leakage rate.
Summary of the invention
The present invention is intended to overcome above-mentioned technological deficiency, purpose provide a kind of simple in structure, dismounting is easy to maintenance, the life-span is long, frictional force is little, frequency response is high, reliability is high, the prevention external leakage hydraulic cylinder with clearance sealed type deformed piston.
To achieve these goals, the technical solution used in the present invention is: this oil hydraulic cylinder comprises cylinder body, piston, piston rod, guide sleeve and end cap, it is characterized in that evenly having 3～5 compensating grooves symmetrically at the cylindrical of piston, be provided with first seal groove at the piston rod place that piston is installed, the piston end faces of both sides is equipped with the annular boss identical with piston external diameter.
Cylindrical place at guide sleeve is provided with second seal groove, inner circle and cylindrical place at guide sleeve are provided with first drain pan and second drain pan respectively, first drain pan communicates through the second draining passage and second drain pan, second drain pan communicates with the first draining passage on being arranged on cylinder body, is provided with circular groove near inner circle on the guide sleeve inner side end; End cap is equipped with in the guide sleeve outside; Rodless cavity and rod chamber on the cylinder body have oil inlet and outlet.Wherein:
The section of annular boss is a right-angled trapezium, and the angle of right-angled trapezium is α=25～35 °, and the height of right-angled trapezium is L=6～12mm, and the last bottom side length of right-angled trapezium is N=1～1.5mm; Annular boss and piston are an integral body;
The material of guide sleeve is a copper material; The circular groove degree of depth of guide sleeve inner side end is L '=6～12mm, and the bottom land of circular groove is wide to be K '=6～10mm, and the section of circular groove is a right-angled trapezium, and the angle of right-angled trapezium is α '=25～35 °; Circular groove is Δ R '=1～1.5mm in the difference of the interior circle radius of the interior circle radius of end and guide sleeve;
Groove width 0.5～the 0.8mm of compensating groove, the distance between groove depth 0.6～1.0mm, every compensating groove is 5～8mm;
Piston material is a cast steel, the outside piston chrome-faced, and thickness of coating is 0.01～0.02mm; The piston both sides are equipped with second back-up ring and first back-up ring respectively, are fixed on the piston rod by spring washer and nut; The matching gap of piston and cylinder body is δ=15～35 μ m;
First seal groove and second seal groove all adopt O-ring seals.
Owing to adopt technique scheme, the present invention:
1, adopting cast steel is the piston of made, has certain elastic deformation; Piston both sides end face is processed as annular boss, and its section is trapezoidal, raises with oil pressure, annular boss is outwards expanded, and piston and cylinder body gap smaller can prevent the leakage rate that increases because of piston two pressure measurement differences effectively, reduce its gap by the piston distortion, thereby effectively reduce leakage rate.
2, on piston, be processed with 3～5 compensating grooves, hydraulic oil flow is in groove, make the oil liquid pressure in a week in the groove even, make piston and the cylinder body can be concentric effectively, learn from the fluid mechanics flow formula: the leakage rate of annular space is directly proportional with gap 3 powers, thereby has reduced the leakage rate that increases because of eccentric; Owing to the effect of compensating groove, the oil film that forms in the gap can reduce surface friction drag effectively, makes frictional force little simultaneously; Simultaneously can shorten the response time, improve frequency response.
3, guide sleeve adopts the copper product manufacturing, inboard near being processed into the circular groove that section is a right-angled trapezium in the piston rod place, the annular boss that forms between circular groove and guide sleeve inwall is near piston rod, when hydraulic fluid pressure raises, annular boss is expanded to the piston rod direction under the hydraulic fluid pressure effect, gap between guide sleeve and the piston rod reduces, and reaches the purpose that reduces leakage rate.
4, seal form adopts clearance seal, and simple in structure, dismounting is easy to maintenance; The outside piston chrome-faced, thickness of coating is 0.01～0.02mm, has wear resistance, and is because the relative movement friction pair all has film lubrication, not easy to wear simultaneously, makes piston life long, the reliability height.
5, on guide sleeve, be processed with first leakage grooves, the fluid that leaks guided to the first draining passage of cylinder body, guide to fuel tank then, reduce external leakage and cause environmental pollution, also can utilize again simultaneously leaking oil by the second draining passage.
Therefore, the present invention has simple in structure, characteristics such as dismounting is easy to maintenance, the life-span is long, frictional force is little, frequency response is high, reliability is high, prevention external leakage.The Hydrauservo System that can be widely used in the hydraulic system and the Hydrauservo System, particularly high frequency response of various operating modes is as Hydrauservo System in hydraulic pressing down system in rolling mill, conticaster crystallizer vibrating hydraulic servo-system, the military project hydraulic equipment etc.
Description of drawings
Fig. 1 is a kind of structure diagram of the present invention;
Fig. 2 is the local enlarged diagram in I place of piston 5 among Fig. 1;
Fig. 3 is the local enlarged diagram in II place of guide sleeve 11 among Fig. 1.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention being described further, is not limiting the scope of the invention.
A kind of hydraulic cylinder with clearance sealed type deformed piston, as shown in Figure 1, this oil hydraulic cylinder comprises cylinder body 1, piston 5, piston rod 18, guide sleeve 11 and end cap 15, it is characterized in that evenly having 3～5 compensating grooves 6 symmetrically at the cylindrical of piston 5, be provided with first seal groove 7 at piston rod 18 places that piston 5 is installed, piston 5 end faces of both sides are equipped with and the identical annular boss of piston 5 external diameters.
Be provided with second seal groove 16 at the cylindrical place of guide sleeve 11, inner circle and cylindrical place at guide sleeve 11 are provided with first drain pan 14 and second drain pan 17 respectively, first drain pan 14 communicates through the second draining passage 13 and second drain pan 17, second drain pan 17 communicates with the first draining passage 12 on being arranged on cylinder body 1, is provided with circular groove near inner circle on guide sleeve 11 inner side ends; End cap 15 is equipped with in guide sleeve 11 outsides; Rodless cavity on the cylinder body 1 and rod chamber have oil inlet and outlet 9,10.
In present embodiment 1:
The section of annular boss as shown in Figure 2, section configuration is a right-angled trapezium, the angle of right-angled trapezium is α=25～30 °, the height of right-angled trapezium is L=6～10mm, the last bottom side length of right-angled trapezium is N=1～1.3mm; Annular boss and piston 5 are an integral body;
The material of guide sleeve 11 is a copper material; The circular groove of guide sleeve 11 inner side ends as shown in Figure 3, the degree of depth of circular groove is L '=6～10mm, the bottom land of circular groove is wide to be K '=6～9mm, the section of circular groove is a right-angled trapezium, the angle of right-angled trapezium is α '=25～30 °; Circular groove is Δ R '=1～1.3mm in the difference of the interior circle radius of the interior circle radius of end and guide sleeve 11;
Groove width 0.5～the 0.7mm of compensating groove 6, the distance between groove depth 0.6～0.8mm, every compensating groove is 5～7mm;
Piston 5 materials are cast steel, piston 5 outer round surface chromium plating, and thickness of coating is 0.01～0.02mm; Piston 5 both sides are equipped with second back-up ring 8 and first back-up ring 4 respectively, are fixed on the piston rod 18 by spring washer 3 and nut 2; Piston 5 is δ=15～25 μ m with the matching gap of cylinder body 1;
A kind of hydraulic cylinder with clearance sealed type deformed piston.The shape of annular boss as shown in Figure 2, its section is a right-angled trapezium, the angle of right-angled trapezium is α=30～35 °, the height of right-angled trapezium is L=8～12mm, the last bottom side length of right-angled trapezium is N=1.2～1.5mm.Annular boss and piston 5 are an integral body.
The circular groove of guide sleeve 11 inner side ends as shown in Figure 3, the degree of depth of circular groove is L '=8～12mm, the bottom land of circular groove is wide to be K '=8～10mm, the section of circular groove is a right-angled trapezium, the angle of right-angled trapezium is α '=30～35 °; Circular groove is Δ R '=1.3～1.5mm in the difference of the interior circle radius of the interior circle radius of end and guide sleeve 11;
Groove width 0.6～the 0.8mm of the compensating groove 6 on the piston 5, the distance between groove depth 0.8～1.0mm, every compensating groove is 6～8mm; Piston 5 is δ=25～35 μ m with the matching gap of cylinder body 1.
All the other are with embodiment 1.
The present embodiment embodiment:
1, adopting cast steel is the piston of made, has certain elastic deformation; Piston both sides end face is processed as annular boss, and its section is trapezoidal, raises with oil pressure, annular boss is outwards expanded, and piston and cylinder body gap smaller can prevent the leakage rate that increases because of piston two pressure measurement differences effectively, by its gap of piston distortion reducing, thus the prevention external leakage.
2, on piston, be processed with 3～5 compensating grooves, hydraulic oil flow is in groove, make the oil liquid pressure in a week in the groove even, make piston and the cylinder body can be concentric effectively, learn from the fluid mechanics flow formula: the leakage rate of annular space is directly proportional with gap 3 powers, thereby has reduced the leakage rate that increases because of eccentric; Owing to the effect of compensating groove, the oil film that forms in the gap can reduce surface friction drag effectively, makes frictional force little simultaneously; Simultaneously can shorten the response time, improve frequency response.
3, guide sleeve adopts the copper product manufacturing, inboard near being processed into the circular groove that section is a right-angled trapezium in the piston rod place, the annular boss that forms between circular groove and guide sleeve inwall is near piston rod, when hydraulic fluid pressure raises, annular boss is expanded to the piston rod direction under the hydraulic fluid pressure effect, gap between guide sleeve and the piston rod reduces, and reaches the purpose that reduces leakage rate.
4, seal form adopts clearance seal, and simple in structure, dismounting is easy to maintenance; The outside piston chrome-faced, thickness of coating is 0.01～0.02mm, has wear resistance, and is because the relative movement friction pair all has film lubrication, not easy to wear simultaneously, makes piston life long, the reliability height.
5, on guide sleeve, be processed with first leakage grooves, the fluid that leaks guided to the first draining passage of cylinder body, guide to fuel tank then, reduce external leakage and cause environmental pollution, also can utilize again simultaneously leaking oil by the second draining passage.
Therefore, this embodiment has simple in structure, characteristics such as dismounting is easy to maintenance, the life-span is long, frictional force is little, frequency response is high, reliability is high, prevention external leakage.The Hydrauservo System that can be widely used in the hydraulic system and the Hydrauservo System, particularly high frequency response of various operating modes is as Hydrauservo System in hydraulic pressing down system in rolling mill, conticaster crystallizer vibrating hydraulic servo-system, the military project hydraulic equipment etc.
Claims (6)
1. hydraulic cylinder with clearance sealed type deformed piston, comprise cylinder body [1], piston [5], piston rod [18], guide sleeve [11] and end cap [15], it is characterized in that evenly having 3～5 compensating grooves [6] symmetrically at the cylindrical of piston [5], locate to be provided with first seal groove [7] at the piston rod [18] that piston [5] is installed, piston [5] end faces of both sides is equipped with and the identical annular boss of piston [5] external diameter;
Be provided with second seal groove [16] at the cylindrical place of guide sleeve [11], inner circle and cylindrical place at guide sleeve [11] are provided with first drain pan [14] and second drain pan [17] respectively, first drain pan [14] communicates through the second draining passage [13] and second drain pan [17], second drain pan [17] communicates with the first draining passage [12] on being arranged on cylinder body [1], is provided with circular groove near inner circle on guide sleeve [11] inner side end; End cap [15] is equipped with in guide sleeve [11] outside; Rodless cavity on the cylinder body [1] and rod chamber have oil inlet and outlet [9,10].
2. hydraulic cylinder with clearance sealed type deformed piston according to claim 1, the section that it is characterized in that described annular boss is a right-angled trapezium, the angle of right-angled trapezium is α=25～35 °, and the height of right-angled trapezium is L=6～12mm, and the last bottom side length of right-angled trapezium is N=1～1.5mm; Annular boss and piston [5] are an integral body.
3. hydraulic cylinder with clearance sealed type deformed piston according to claim 1, the material that it is characterized in that described guide sleeve [11] is a copper material; The circular groove degree of depth of guide sleeve [11] inner side end is L '=6～12mm, and the bottom land of circular groove is wide to be K '=6～10mm, and the section of circular groove is a right-angled trapezium, and the angle of right-angled trapezium is α '=25～35 °; Circular groove is AR '=1～1.5mm in the difference of the interior circle radius of the interior circle radius of end and guide sleeve [11].
4. hydraulic cylinder with clearance sealed type deformed piston according to claim 1 is characterized in that the groove width 0.5～0.8mm of described compensating groove [6], and the distance between groove depth 0.6～1.0mm, every compensating groove is 5～8mm.
5. hydraulic cylinder with clearance sealed type deformed piston according to claim 1 is characterized in that described piston [5] material is a cast steel, piston [5] outer round surface chromium plating, and thickness of coating is 0.01～0.02mm; Piston [5] both sides are equipped with second back-up ring [8] and first back-up ring [4] respectively, are fixed on the piston rod [18] by spring washer [3] and nut [2]; Piston [5] is δ=15～35 μ m with the matching gap of cylinder body [1].
6. hydraulic cylinder with clearance sealed type deformed piston according to claim 1 is characterized in that described first seal groove [7] and second seal groove [16] all adopt O-ring seals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102727433A CN101725588B (en) | 2009-11-10 | 2009-11-10 | Hydraulic cylinder with clearance sealed type deformed piston |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102727433A CN101725588B (en) | 2009-11-10 | 2009-11-10 | Hydraulic cylinder with clearance sealed type deformed piston |
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| Publication Number | Publication Date |
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| CN101725588A true CN101725588A (en) | 2010-06-09 |
| CN101725588B CN101725588B (en) | 2012-05-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009102727433A Expired - Fee Related CN101725588B (en) | 2009-11-10 | 2009-11-10 | Hydraulic cylinder with clearance sealed type deformed piston |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102305289A (en) * | 2011-08-04 | 2012-01-04 | 武汉科技大学 | Gap seal hydraulic cylinder based on deformable piston ring |
| CN103174699A (en) * | 2013-02-28 | 2013-06-26 | 韶关市伟光液压油缸有限公司 | Servo hydraulic cylinder |
| CN103867526A (en) * | 2014-04-11 | 2014-06-18 | 武汉科技大学 | Low-friction hybrid support guide sleeve hydraulic cylinder |
| CN104006023A (en) * | 2014-06-06 | 2014-08-27 | 徐州徐工液压件有限公司 | Clearance seal plunger type cylinder |
| CN104564901A (en) * | 2015-01-27 | 2015-04-29 | 武汉科技大学 | Low-friction hydraulic cylinder based on mini-type round pits |
| CN104989696A (en) * | 2015-07-03 | 2015-10-21 | 武汉科技大学 | Variable-gap sealing type hydraulic cylinder of guide system |
| CN105269563A (en) * | 2015-11-30 | 2016-01-27 | 宁波新芝华东环保科技有限公司 | Environment-friendly three-freedom-degree fetching mechanical arm used under dangerous work conditions |
| CN106762963A (en) * | 2017-03-10 | 2017-05-31 | 中建材(洛阳)节能科技有限公司 | A kind of anti-leakage device of hydraulic cylinder |
| CN108223490A (en) * | 2018-03-05 | 2018-06-29 | 武汉科技大学 | A kind of adaptive clearance seal double plunger synchronous hydraulic cylinder of high pressure |
| CN110030225A (en) * | 2019-03-14 | 2019-07-19 | 徐州工程学院 | A kind of hydraulic cylinder with spacial seal piston |
| CN110030226A (en) * | 2019-04-19 | 2019-07-19 | 武汉科技大学 | A kind of anti-bias load hydraulic cylinder based on heterogeneous frictional interface elastohydrodynamic lubrication performance |
| CN115143225A (en) * | 2022-06-29 | 2022-10-04 | 中国矿业大学 | Pneumatic vibration damper for eliminating static friction of mobile platform |
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| US3323806A (en) * | 1962-12-14 | 1967-06-06 | H W Loud Machine Works Inc | Fluid seal |
| CN1114396A (en) * | 1994-06-27 | 1996-01-03 | 余毅钦 | Hydraulically autocontrolled oil cylinder with two-stage dynamic seal |
| CN201093027Y (en) * | 2007-12-03 | 2008-07-30 | 许少辉 | Hydraulic cylinder |
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2009
- 2009-11-10 CN CN2009102727433A patent/CN101725588B/en not_active Expired - Fee Related
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102305289A (en) * | 2011-08-04 | 2012-01-04 | 武汉科技大学 | Gap seal hydraulic cylinder based on deformable piston ring |
| CN103174699B (en) * | 2013-02-28 | 2015-11-18 | 韶关市伟光液压油缸有限公司 | A kind of servo hydraulic oil cylinder |
| CN103174699A (en) * | 2013-02-28 | 2013-06-26 | 韶关市伟光液压油缸有限公司 | Servo hydraulic cylinder |
| CN103867526A (en) * | 2014-04-11 | 2014-06-18 | 武汉科技大学 | Low-friction hybrid support guide sleeve hydraulic cylinder |
| CN104006023A (en) * | 2014-06-06 | 2014-08-27 | 徐州徐工液压件有限公司 | Clearance seal plunger type cylinder |
| CN104564901B (en) * | 2015-01-27 | 2016-08-24 | 武汉科技大学 | A kind of low friction hydraulic cylinder based on miniature round pool |
| CN104564901A (en) * | 2015-01-27 | 2015-04-29 | 武汉科技大学 | Low-friction hydraulic cylinder based on mini-type round pits |
| CN104989696A (en) * | 2015-07-03 | 2015-10-21 | 武汉科技大学 | Variable-gap sealing type hydraulic cylinder of guide system |
| CN104989696B (en) * | 2015-07-03 | 2017-04-12 | 武汉科技大学 | Variable-gap sealing type hydraulic cylinder of guide system |
| CN105269563A (en) * | 2015-11-30 | 2016-01-27 | 宁波新芝华东环保科技有限公司 | Environment-friendly three-freedom-degree fetching mechanical arm used under dangerous work conditions |
| CN106762963A (en) * | 2017-03-10 | 2017-05-31 | 中建材(洛阳)节能科技有限公司 | A kind of anti-leakage device of hydraulic cylinder |
| CN106762963B (en) * | 2017-03-10 | 2019-01-15 | 中建材(洛阳)节能科技有限公司 | A kind of anti-leakage device of hydraulic cylinder |
| CN108223490A (en) * | 2018-03-05 | 2018-06-29 | 武汉科技大学 | A kind of adaptive clearance seal double plunger synchronous hydraulic cylinder of high pressure |
| CN108223490B (en) * | 2018-03-05 | 2023-09-05 | 武汉科技大学 | High-pressure self-adaptive gap sealing double-plunger synchronous hydraulic cylinder |
| CN110030225A (en) * | 2019-03-14 | 2019-07-19 | 徐州工程学院 | A kind of hydraulic cylinder with spacial seal piston |
| CN110030225B (en) * | 2019-03-14 | 2024-03-19 | 徐州工程学院 | Hydraulic cylinder with clearance dynamic seal piston |
| CN110030226A (en) * | 2019-04-19 | 2019-07-19 | 武汉科技大学 | A kind of anti-bias load hydraulic cylinder based on heterogeneous frictional interface elastohydrodynamic lubrication performance |
| CN115143225A (en) * | 2022-06-29 | 2022-10-04 | 中国矿业大学 | Pneumatic vibration damper for eliminating static friction of mobile platform |
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| CN101725588B (en) | 2012-05-23 |
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Granted publication date: 20120523 Termination date: 20131110 |