CN102305289A - Gap seal hydraulic cylinder based on deformable piston ring - Google Patents
Gap seal hydraulic cylinder based on deformable piston ring Download PDFInfo
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- CN102305289A CN102305289A CN201110222531A CN201110222531A CN102305289A CN 102305289 A CN102305289 A CN 102305289A CN 201110222531 A CN201110222531 A CN 201110222531A CN 201110222531 A CN201110222531 A CN 201110222531A CN 102305289 A CN102305289 A CN 102305289A
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Abstract
The invention relates to a gap seal hydraulic cylinder based on a deformable piston ring. The hydraulic cylinder provided by the invention is characterized in that the cylindrical boss end face and the annular bottom surface of the deformable piston ring (6) are concentrically and closely clung to the concave round bottom and the annular boss end face of a piston (7); the deformable piston ring (6) and the piston (7) have the same outer diameter; the deformable piston ring (6) is fixed with the piston (7) by a screw (3); the cylindrical surfaces of the deformable piston ring (6) and the piston (7) are correspondingly welded with a first aluminum bronze layer (14) and a second aluminum bronze layer (13); the left end face of the deformable piston ring (6) is composed of a concave round bottom in an obconical frustum shape and an annular boss which are arranged concentrically, and the annular boss with a right-trapezoidal section forms the lip of the deformable piston ring (6); a second valve block (17) is concentrically fixed at an oil port (16) of a rod-less cavity; and a pressure limiting valve (15) is closely clung to a cylinder barrel (2) and is fixed on the second valve block (17). The hydraulic cylinder provided by the invention has the characteristics of long service life, low friction performance, high frequency response, high efficiency, high reliability, low maintenance cost and overload protection performance.
Description
Technical field
The invention belongs to the oil hydraulic cylinder technical field.Be specifically related to a kind of clearance seal oil hydraulic cylinder based on the Deformed piston ring.
Background technique
Oil hydraulic cylinder particularly servo hydraulic cylinder is used more and more widely in the hydraulics field, and it combines with instrument and apparatus, technology such as automatically controlled at work, has increased new features and new vigor for the hydraulic press tool.Because its environment of applications and condition require servo hydraulic cylinder to have high response, low friction, do not have and creep, do not have characteristics such as external leakage, long lifetime, reliability height, so it is to the specific (special) requirements of having selected for use of sealing, supporting guiding and material.The sealing material application success is to fill to gather tetrem alkene at present, and its chemical stability is good, good wear resistance, heat resistance and oil resistance are arranged, and friction factor is very little.But the sealing of this oil hydraulic cylinder is still solid matter and directly contacts, and not only influences the further raising of frequency, and influences the life-span of Sealing.
The servo hydraulic cylinder of more domestic in recent years unit developments gathers tetrem alkene Sealing though removed, and has adopted clearance seal; But not enough below in application, existing, the oil hydraulic cylinder volumetric efficiency is low, along with charge oil pressure rising volumetric efficiency is lower; Life-span is short, and it is high to change the piston cost.
Summary of the invention
The present invention is intended to overcome above-mentioned technological deficiency, and purpose provides long, low friction, high frequency sound, high efficiency, high reliability of a kind of life-span, maintenance cost is low and the clearance seal oil hydraulic cylinder based on the Deformed piston ring of ability overload protection.
For realizing above-mentioned purpose; The technological scheme that the present invention adopts is: the right side of Deformed piston ring is made up of concentric cylindrical boss and annular bottom surface; The left side of piston is made up of concentric spill round bottom and annular boss; The annular boss cross section of the left side of piston is a rectangle, and the cylindrical boss external diameter of the right side of Deformed piston ring is with the spill round bottom internal diameter and the degree of depth with the left side of piston is identical highly respectively; The cylindrical boss end face of Deformed piston ring and annular bottom surface are close to the spill round bottom and the annular boss end face of piston concentrically.The external diameter of Deformed piston ring is identical with the external diameter of piston; The center of Deformed piston ring and piston is provided with tapped hole; The Deformed piston ring is fixed together through screw and piston, and the periphery of Deformed piston ring and piston is welded with the first aluminum bronze layer and the second aluminum bronze layer accordingly.The left side of Deformed piston ring is made up of the spill round bottom and the annular boss of concentric rounding cone table shape, and the annular boss cross section of the left side of Deformed piston ring is a right-angled trapezium, and the cross section is the lip limit that the annular boss of right-angled trapezium constitutes the Deformed piston ring.
Deformed piston ring and piston are packed in the cylinder barrel versatilely, and rear end cover is fixedly mounted in the left side of cylinder barrel; The right-hand member of piston is provided with piston rod, and the right-hand member of cylinder barrel is equipped with guide sleeve, and guide sleeve is close to front cover, and front cover is fixedly mounted in the right side of cylinder barrel.
At the rod chamber oil port the first valve piece is housed fixedly; The center hole of the first valve piece and rod chamber hydraulic fluid port are concentricity; At the rodless cavity oil port the second valve piece is housed fixedly; The center hole of the second valve piece and rodless cavity hydraulic fluid port are concentricity; Pressure-limit valve is close to cylinder barrel and is fixed on the second valve piece, and the filler opening of pressure-limit valve communicates with the center hole of the second valve piece.
In technique scheme: the height H of right-angled trapezium=8～12mm, the long L=0.8～1.2mm of upper base, the hypotenuse of right-angled trapezium and the angle of right angle side=20～40 °; Cylndrical surface thickness B=15～the 25mm of Deformed piston ring, the material of Deformed piston ring is No. 25 forged steel or is No. 35 forged steel; The bed thickness of the first aluminum bronze layer and the second aluminum bronze layer is 0.5～1.0mm, and material is QAL9-4.
Because adopt technique scheme, the present invention compares with prior art has following good effect:
(1) the present invention is equipped with concavo-convex Deformed piston ring at the left end of piston; The spill round bottom embedding mutually of the circular, cylindrical projection table top of Deformed piston ring and piston; Concentrically that both are fastening through screw, the cylndrical surface of Deformed piston ring is welded with the first aluminum bronze layer, can reduce the wearing and tearing to inner wall of cylinder.The annular boss cross section of Deformed piston ring left side is a right-angled trapezium, and the cross section is the lip limit that the annular boss of right-angled trapezium constitutes the Deformed piston ring.
The lip limit of Deformed piston ring is under the hydraulic fluid pressure effect, and open outward on its lip limit, reduces the gap between Deformed piston ring and the inner wall of cylinder, and along with the variation in pressure of hydraulic oil, the outer tensor on lip limit also changes thereupon, and its gap value also changes thereupon.Therefore, can effectively prevent to reveal, the efficient of oil hydraulic cylinder is improved.In addition, the Deformed piston ring also plays the effect of selflubricating, and fluid is stored in the gap, makes the self oiling of piston ability, and frictional force reduces, the work frequency response that has improved whole oil hydraulic cylinder.When the lip limit of Deformed piston ring is worn, can more renew, and need not change whole piston, maintenance cost is reduced.
(2) the present invention is equipped with pressure-limit valve on the second valve piece of rodless cavity oil port; Play safe overload protective function; The setting of its maximum pressure is till the Deformed piston ring does not produce dry friction with inner wall of cylinder when opening outside the lip limit in the course of the work; Oil hydraulic cylinder regulates when dispatching from the factory according to customer requirements.Therefore, oil hydraulic cylinder has very high reliability.
(3) the present invention is welded with the second aluminum bronze layer on the cylndrical surface of piston, when hydraulic cylinder works, prevents the inwall of piston damage cylinder barrel.In case the surface abrasion of piston can weld aluminum bronze again, improve the validity of piston, increased the working life of piston.
Therefore, the present invention has long, low friction, high frequency sound, high efficiency, high reliability of life-span, maintenance cost is low and the characteristics of ability overload protection.
Description of drawings
Fig. 1 is a kind of structural representation of the present invention;
Fig. 2 is the local enlarged diagram of the I of Deformed piston ring 6 among Fig. 1.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention being further described, is not the restriction to its protection domain.
Embodiment 1
A kind of clearance seal oil hydraulic cylinder based on the Deformed piston ring.This oil hydraulic cylinder as shown in Figure 1; The right side of Deformed piston ring 6 is made up of concentric cylindrical boss and annular bottom surface; The left side of piston 7 is made up of concentric spill round bottom and annular boss; The annular boss cross section of the left side of piston 7 is a rectangle, and the cylindrical boss external diameter of the right side of Deformed piston ring 6 is with the spill round bottom internal diameter and the degree of depth with the left side of piston 7 is identical highly respectively; The cylindrical boss end face of Deformed piston ring 6 and annular bottom surface are close to the spill round bottom and the annular boss end face of piston 7 concentrically.The external diameter of Deformed piston ring 6 is identical with the external diameter of piston 7, and the center of Deformed piston ring 6 and piston 7 is provided with tapped hole, and Deformed piston ring 6 is fixed together with piston 7 through screw 3, spring washer 4 and packing ring 5.The periphery of Deformed piston ring 6 and piston 7 is welded with the first aluminum bronze layer 14 and the second aluminum bronze layer 13 accordingly; The left side of Deformed piston ring 6 is made up of the spill round bottom and the annular boss of concentric rounding cone table shape, and the annular boss cross section of the left side of Deformed piston ring 6 is a right-angled trapezium, and the cross section is the lip limit that the annular boss of right-angled trapezium constitutes Deformed piston ring 6.
Deformed piston ring 6 is packed into piston 7 in the cylinder barrel 2 versatilely, and rear end cover 1 is fixedly mounted in the left side of cylinder barrel 2; The right-hand member of piston 7 is provided with piston rod 8, and the right-hand member of cylinder barrel 2 is equipped with guide sleeve 9, and guide sleeve 9 is close to front cover 10, and front cover 10 is fixedly mounted in the right side of cylinder barrel 2.
At rod chamber hydraulic fluid port 11 places the first valve piece 12 is housed fixedly; The center hole of the first valve piece 12 and rod chamber hydraulic fluid port 11 are concentricity; At rodless cavity hydraulic fluid port 16 places the second valve piece 17 is housed fixedly; The center hole of the second valve piece 17 and rodless cavity hydraulic fluid port 16 are concentricity; Pressure-limit valve 15 is close to cylinder barrel 2 and is fixed on the second valve piece 17, and the filler opening of pressure-limit valve 15 communicates with the center hole of the second valve piece 17.
In the present embodiment: the height H of right-angled trapezium=8～10mm, the long L=0.8～1.0mm of upper base, the hypotenuse of right-angled trapezium and the angle of right angle side=20～30 °; Cylndrical surface thickness B=15～the 20mm of Deformed piston ring 6, the material of Deformed piston ring 6 is No. 25 forged steel or is No. 35 forged steel; The bed thickness of the first aluminum bronze layer 14 and the second aluminum bronze layer 13 is 0.5～0.8mm.
Embodiment 2
A kind of clearance seal oil hydraulic cylinder based on the Deformed piston ring.
The height H of right-angled trapezium=10～12mm, the long L=1.0～1.2mm of upper base, the hypotenuse of right-angled trapezium and the angle of right angle side=30～40 °; Cylndrical surface thickness B=20～the 25mm of Deformed piston ring 6; The bed thickness of the first aluminum bronze layer 14 and the second aluminum bronze layer 13 is 0.8～1.0mm.
All the other are with embodiment 1.
Embodiment 3
A kind of clearance seal oil hydraulic cylinder based on the Deformed piston ring.
The height H of right-angled trapezium=9～11mm, the long L=0.9～1.1mm of upper base, the hypotenuse of right-angled trapezium and the angle of right angle side=25～35 °; Cylndrical surface thickness B=18～the 22mm of Deformed piston ring 6; The bed thickness of the first aluminum bronze layer 14 and the second aluminum bronze layer 13 is 0.6～0.8mm.
All the other are with embodiment 1.
This embodiment is compared with prior art has following good effect:
(1) this embodiment is equipped with concavo-convex Deformed piston ring 6 at the left end of piston 7; The spill round bottom embedding mutually of the circular, cylindrical projection table top of Deformed piston ring 6 and piston 7; Concentrically that both are fastening through screw 3; The cylndrical surface of Deformed piston ring 6 is welded with the first aluminum bronze layer 14, can reduce the wearing and tearing to cylinder barrel 2 inwalls.The annular boss cross section of the left side of Deformed piston ring 6 is a right-angled trapezium, and the cross section is the lip limit that the annular boss of right-angled trapezium constitutes Deformed piston ring 6.
The lip limit of Deformed piston ring 6 is under the hydraulic fluid pressure effect, and open outward on its lip limit, reduces the gap between Deformed piston ring 6 and cylinder barrel 2 inwalls, and along with the variation in pressure of hydraulic oil, the outer tensor on lip limit also changes thereupon, and its gap value also changes thereupon.Therefore, can effectively prevent to reveal, the efficient of oil hydraulic cylinder is improved.In addition, Deformed piston ring 6 also plays the effect of selflubricating, and fluid is stored in the gap, makes piston 7 ability self oilings, and frictional force reduces, the work frequency response that has improved whole oil hydraulic cylinder.When the lip limit of Deformed piston ring 6 is worn, can more renew, and need not change whole piston, maintenance cost is reduced.
(2) this embodiment is equipped with pressure-limit valve 15 on the second valve piece 17 at rodless cavity hydraulic fluid port 16 places; Play safe overload protective function; The setting of its maximum pressure is till Deformed piston ring 6 does not produce dry friction with cylinder barrel 2 inwalls when opening outside the lip limit in the course of the work; Oil hydraulic cylinder regulates when dispatching from the factory according to customer requirements.Therefore, oil hydraulic cylinder has very high reliability.
(3) this embodiment is welded with the second aluminum bronze layer 13 on the cylndrical surface of piston 7, when hydraulic cylinder works, prevents the inwall of piston 7 damage cylinder barrels 2.In case the surface abrasion of piston 7 can weld aluminum bronze again, improve the validity of piston 7, increased the working life of piston 7.
Therefore, this embodiment has long, low friction, high frequency sound, high efficiency, high reliability of life-span, maintenance cost is low and the characteristics of ability overload protection.
Claims (4)
1. clearance seal oil hydraulic cylinder based on the Deformed piston ring; The right side that it is characterized in that Deformed piston ring [6] is made up of concentric cylindrical boss and annular bottom surface; The left side of piston [7] is made up of concentric spill round bottom and annular boss; The annular boss cross section of the left side of piston [7] is a rectangle, and the cylindrical boss external diameter of the right side of Deformed piston ring [6] is with the spill round bottom internal diameter and the degree of depth with the left side of piston [7] is identical highly respectively; The cylindrical boss end face of Deformed piston ring [6] and annular bottom surface are close to the spill round bottom and the annular boss end face of piston [7] concentrically; The external diameter of Deformed piston ring [6] is identical with the external diameter of piston [7]; The center of Deformed piston ring [6] and piston [7] is provided with tapped hole; Deformed piston ring [6] is fixed together through screw [3] and piston [7], and the periphery of Deformed piston ring [6] and piston [7] is welded with the first aluminum bronze layer [14] and the second aluminum bronze layer [13] accordingly; The left side of Deformed piston ring [6] is made up of the spill round bottom and the annular boss of concentric rounding cone table shape, and the annular boss cross section of the left side of Deformed piston ring [6] is a right-angled trapezium;
Deformed piston ring [6] and piston [7] are packed in the cylinder barrel [2] versatilely, and rear end cover [1] is fixedly mounted in the left side of cylinder barrel [2]; The concentric piston rod [8] that is provided with of the right-hand member of piston [7], the right-hand member of cylinder barrel [2] is equipped with guide sleeve [9], and guide sleeve [9] is close to front cover [10], and front cover [10] is fixedly mounted in the right side of cylinder barrel [2];
Locate fixedly to be equipped with the first valve piece [12] at rod chamber hydraulic fluid port [11]; The center hole of the first valve piece [12] and rod chamber hydraulic fluid port [11] are concentricity; Locate fixedly to be equipped with the second valve piece [17] at rodless cavity hydraulic fluid port [16]; The center hole of the second valve piece [17] and rodless cavity hydraulic fluid port [16] are concentricity; Pressure-limit valve [15] is close to cylinder barrel [2] and is fixed on the second valve piece [17], and the filler opening of pressure-limit valve [15] communicates with the center hole of the second valve piece [17].
2. the clearance seal oil hydraulic cylinder based on the Deformed piston ring according to claim 1 is characterized in that the height H=8～12mm of described right-angled trapezium, the long L=0.8～1.2mm of upper base, the hypotenuse of right-angled trapezium and the angle of right angle side=20～40 °.
3. the clearance seal oil hydraulic cylinder based on the Deformed piston ring according to claim 1 is characterized in that the cylndrical surface thickness B=15～25mm of described Deformed piston ring [6], and the material of Deformed piston ring [6] is No. 25 forged steel or is No. 35 forged steel.
4. the clearance seal oil hydraulic cylinder based on the Deformed piston ring according to claim 1 is characterized in that the bed thickness of the described first aluminum bronze layer [14] and the second aluminum bronze layer [13] is 0.5～1.0mm, and material is QAL9-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110222531A CN102305289A (en) | 2011-08-04 | 2011-08-04 | Gap seal hydraulic cylinder based on deformable piston ring |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110222531A CN102305289A (en) | 2011-08-04 | 2011-08-04 | Gap seal hydraulic cylinder based on deformable piston ring |
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| CN102305289A true CN102305289A (en) | 2012-01-04 |
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| CN201110222531A Pending CN102305289A (en) | 2011-08-04 | 2011-08-04 | Gap seal hydraulic cylinder based on deformable piston ring |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103527466A (en) * | 2013-10-18 | 2014-01-22 | 无锡威孚精密机械制造有限责任公司 | Double-type high-air-impermeability hydraulic pressure plunger pump piston |
| CN104989696A (en) * | 2015-07-03 | 2015-10-21 | 武汉科技大学 | Variable-gap sealing type hydraulic cylinder of guide system |
| CN109296592A (en) * | 2018-12-04 | 2019-02-01 | 武汉科技大学 | A kind of piston assembly for high pressure low friction hydraulic cylinder |
| CN112268034A (en) * | 2020-10-29 | 2021-01-26 | 南京中远海运船舶设备配件有限公司 | Accurate movement anvil cylinder assembly of electric heating upsetting machine for production of marine low-speed diesel engine air valve |
| CN113309759A (en) * | 2021-06-25 | 2021-08-27 | 湖北中科产业技术研究院有限公司 | Variable-gap sealing hydraulic cylinder based on lip protection |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103527466A (en) * | 2013-10-18 | 2014-01-22 | 无锡威孚精密机械制造有限责任公司 | Double-type high-air-impermeability hydraulic pressure plunger pump piston |
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| CN109296592A (en) * | 2018-12-04 | 2019-02-01 | 武汉科技大学 | A kind of piston assembly for high pressure low friction hydraulic cylinder |
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| CN112268034A (en) * | 2020-10-29 | 2021-01-26 | 南京中远海运船舶设备配件有限公司 | Accurate movement anvil cylinder assembly of electric heating upsetting machine for production of marine low-speed diesel engine air valve |
| CN113309759A (en) * | 2021-06-25 | 2021-08-27 | 湖北中科产业技术研究院有限公司 | Variable-gap sealing hydraulic cylinder based on lip protection |
| 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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Application publication date: 20120104 |