CN101149116A - Piston sealing structure of inner servo-actuated hydraulic cylinder - Google Patents
Piston sealing structure of inner servo-actuated hydraulic cylinder Download PDFInfo
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- CN101149116A CN101149116A CNA2006101164076A CN200610116407A CN101149116A CN 101149116 A CN101149116 A CN 101149116A CN A2006101164076 A CNA2006101164076 A CN A2006101164076A CN 200610116407 A CN200610116407 A CN 200610116407A CN 101149116 A CN101149116 A CN 101149116A
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Abstract
The present invention relates to hydraulic lift oil cylinder for transportation machinery. The hydraulic lift oil cylinder has one sealing guide belt of high strength and high wear resistance plastic, one upper piston body and one lower piston body contacting axially to constitute one external ring sealing slot for holding the sealing guide belt and one small ring sealing slot for holding one small O-ring in the bottom of the external ring sealing slot. The high strength sealing guide belt has sealing, guiding and supporting effects, and can ensure the normal operation of the piston rod in the cylinder in high reliability.
Description
Technical field
The interior servo-actuated servo-actuated requirement, cylinder barrel hole section is the Transport Machinery hydraulic lifting oil cylinder of bulging in the present invention relates to, and the interior servo-actuated servo-actuated requirement, cylinder barrel hole section is the automobile cab hydraulic lifting oil cylinder (claiming automobile cab hydraulic overturn oil cylinder again) of bulging in relating in particular to.
Background technique
Transport Machinery hydraulic lifting oil cylinder, comprise automobile cab hydraulic lifting oil cylinder, for dodge jolt travel in and relative movement between two parts that are hinged of its two ends cause impact to it, generally the non-lifting state of this class hydraulic lifting oil cylinder all is provided with lag function.Existing servo-actuated design has two big classes.
The first kind is that piston rod and cylinder barrel are not done relative movement, and the hinging supporting shaft at hydraulic lifting oil cylinder two ends can be done relative movement by hinged axis hole of long waist shaped or linkage, dodge Transport Machinery jolt travel in and relative movement between two parts that are hinged of elevating ram two ends cause impact to this hydraulic lifting oil cylinder, thisly realize that by hinged axis hole of long waist shaped or linkage the form of hydraulic lifting oil cylinder servo-actuated claims outer servo-actuated.The advantage of outer follow-up hydraulic elevating ram is the servo-actuated wearing and tearing that do not have Sealing, and the dynamic seal life-span is long.But hinged axis hole of long waist shaped or linkage can produce the gap and impact after being crossed center of gravity by the lifting parts.
Second class is to travel jolting when Transport Machinery, and when relative movement occurring between two parts that hydraulic lifting oil cylinder two ends are hinged, by piston seal being lost efficacy reach piston rod and cylinder barrel can be done relative movement, thus dodge and two parts that hydraulic lifting oil cylinder two ends are hinged between relative movement cause impact to this hydraulic lifting oil cylinder.This design that piston seal was lost efficacy claims interior servo-actuated.The advantage of interior follow-up hydraulic elevating ram is impact very close to each other after being crossed center of gravity by the lifting parts, and simple in structure, and shortcoming is that dynamic seal is had relatively high expectations.
With regard to interior servo-actuated design, two kinds of forms are arranged also at present.
First kind is to be communicated with the servo-actuated pipeline at the follow-up section two ends of cylinder barrel lower bottom part, and piston seal was lost efficacy.The advantage of this design is that the cylinder barrel manufacturing process is simple, and piston seal is not had extra high requirement, and shortcoming is that inner orifice deburring and the abate that the little cross-drilled hole of servo-actuated pipeline is connected in the follow-up section upper end of cylinder barrel had relatively high expectations.
Second kind is axial some draining grooves of delineation on the inner hole wall of the follow-up section of cylinder barrel lower bottom part, and give the sharp edge rounding of draining groove, by these some draining grooves piston seal was lost efficacy, follow-up section to the transition of non-follow-up for gradually to positive circular hole convergent rounding off, wherein adopting more is that the cross section of endoporus of the follow-up section of cylinder barrel lower bottom part is the regular quadrilateral of four jiaos of big roundings on the square basis, so it has four draining grooves, follow-up section to the transition of non-follow-up be the regular quadrilateral hole gradually to positive circular hole convergent rounding off, the nearest opposite side distance of this regular quadrilateral is equal to or slightly greater than the aperture that the piston of the non-follow-up section of cylinder barrel slides within it.The advantage of this design is the follow-up section of cylinder barrel and does not have burr with the changeover portion of trend non-follow-up is all slick and sly that structure is simpler.
At present with this second kind in the existing piston sealing structure overwhelming majority that matches of servo-actuated design be: be the clearance seal between realization piston and the cylinder barrel, rubber o-ring is housed in the annular seal groove of whole cylindrical aluminium piston body periphery wall from inside to outside successively, teflon is the rectangular cross-section sealing and guiding strip of base matter, for the higher hydraulic lifting oil cylinder of operating oil pressure, inboard at the rectangular cross-section sealing and guiding strip, one side of O-ring seals or two sides also are equipped with the plastics back-up ring; Whole cylindrical piston body endoporus matches with the thin portion of piston rod spindle nose, between the clearance seal of a rubber o-ring to whole cylindrical piston body endoporus and the thin portion of piston rod spindle nose also arranged; Teflon be the rectangular cross-section sealing and guiding strip of base matter the expansion of soft back installs in the annular seal groove by being heated, mold pressing is shunk and cooling shaping it again.
Described this piston sealing structure, in follow-up motion, when descent of piston, piston compressing piston cavity of resorption hydraulic oil raises the oil pressure of piston cavity of resorption.On the one hand, the oil pressure of guidance tape downside is higher than the oil pressure of upside thus, and the oil pressure between the guidance tape outside and inner wall of cylinder carries out the transition to the oil pressure of upside gradually from the oil pressure of guidance tape downside; On the other hand, the oil pressure in the zone that the downside of the rubber o-ring of guidance tape inner side surface and guidance tape inboard surrounds must equal the oil pressure of guidance tape downside.So, average oil pressure in the zone that the downside of the rubber o-ring of guidance tape inner side surface and guidance tape inboard surrounds is higher than the average oil pressure in the corresponding region outside the guidance tape, this average oil pressure reduction can make guidance tape downside enlarged-diameter, and four kinds of situations are arranged therefrom.1, if the average oil pressure reduction of guidance tape medial and lateral is less or guidance tape Young's modulus and tensile strength are higher, guidance tape downside diameter expanding deformation is in its regime of elastic deformation, and behind this downside diameter expanding deformation the draining groove between the guidance tape outside and inner wall of cylinder still have bigger flow area by piston cavity of resorption hydraulic oil flow to piston upper chamber, the hydraulic lifting oil cylinder carries out normal servo-actuated, in case stop servo-actuated, guidance tape downside diameter still returns to original state; 2, if the average oil pressure reduction of guidance tape medial and lateral is big or guidance tape Young's modulus and tensile strength are lower, guidance tape downside diameter expanding deformation has exceeded in its regime of elastic deformation, but the draining groove behind this downside diameter expanding deformation between the guidance tape outside and inner wall of cylinder still have bigger flow area by piston cavity of resorption hydraulic oil flow to piston upper chamber, in case stop servo-actuated, guidance tape downside diameter can not full recovery arrive original state, along with the operating time accumulation is many more, guidance tape downside diameter increases at leisure; 3, if the average oil pressure reduction of guidance tape medial and lateral is big or guidance tape Young's modulus and tensile strength are lower, guidance tape downside diameter expanding deformation has exceeded in its regime of elastic deformation, draining groove wall behind this downside diameter expanding deformation between the guidance tape outside and inner wall of cylinder is adjacent to, piston cavity of resorption hydraulic oil can not flow to piston upper chamber and be trapped in the piston cavity of resorption, and piston rod also just can not be done relative movement with cylinder barrel; 4, if the average oil pressure reduction of guidance tape medial and lateral is little, guidance tape downside diameter expanding deformation is in its regime of elastic deformation, but because of the draining groove flow area between the guidance tape outside and inner wall of cylinder less originally, draining groove wall behind this downside diameter expanding deformation between the guidance tape outside and inner wall of cylinder is adjacent to, piston cavity of resorption hydraulic oil can not flow to piston upper chamber and be trapped in the piston cavity of resorption, and piston rod also just can not be done relative movement with cylinder barrel.Described this piston sealing structure is in follow-up motion, when piston stroking upward, in like manner.
Obviously, described second kind of situation finally will cause the appearance of described the 4th kind of situation, guidance tape Young's modulus and tensile strength are low then be described second and third, one of the common principal element of four kinds of situations.Be extensive use of and find, with this second kind of described existing piston sealing structure that the servo-actuated design matches, after the user who travels than severe jolt uses a period of time, tending to take place towards cylinder phenomenon one is the servo-actuated obstacle, the fracture of rectangular seal guidance tape sometimes can appear, cause hydraulic lifting oil cylinder forfeiture lifting function, the user that indivedual severe turbulences are travelled, use has just just produced the servo-actuated obstacle, even rectangular seal guidance tape fracture appears, cause hydraulic lifting oil cylinder forfeiture lifting function, this shows that with teflon be the material of base matter as sealing and guiding strip, and its Young's modulus and tensile strength dislike not enough slightly.
Summary of the invention
Technical problem to be solved by this invention is that the interior servo-actuated hole section of the interior cylinder barrel of being joined of guideline lives phase of Transport Machinery is the hydraulic lifting oil cylinder of bulging, travel for any severe jolt, at non-lifting state, the normally servo-actuated of the relative cylinder barrel of piston rod, the sealing and guiding strip fracture more can not take place, and the piston dynamic seal can not shift to an earlier date wear out failure.
The present invention who solves the problems of the technologies described above mainly includes the piston rod of piston body, a sealing and guiding strip, a main O-ring seals, thick, the thin portion of a spindle nose one-tenth multidiameter shaft shape, sometimes also include a secondary O-ring seals and a Steel Cable Baffle Ring, be characterized in:
One, a described sealing and guiding strip is made by tensile strength 〉=50MPa, compressive strength 〉=60MPa, Young's modulus 〉=1.1GPa, high abrasion, operating temperature range＜-40 ℃～＞80 ℃, ageing-resistant plastics or reinforced plastic.
Two, for ease of the sealing and guiding strip of described high-tensile, high compressive strength is installed, described piston body is made up of a upper piston body and a lower piston body.A described upper piston body, a lower piston body are that the center is sleeved on together successively with the thin portion of described piston rod spindle nose, this upper piston body upper side is near on pluckings, the thin portion of this piston rod boundary end face, axially constitute an outer ring seal groove between this upper piston body that is close together mutually and the lower piston body, adorn described sealing and guiding strip in the outer ring seal groove.This upper piston body, lower piston body are fixed on this piston rod spindle nose two kinds of forms can be arranged: first kind is to cut a circular groove near the external end of lower piston in the thin portion of piston rod spindle nose, and a Steel Cable Baffle Ring that is equipped with in the groove is placed restrictions on the upper piston body and the lower piston body that are sleeved on the thin portion of piston rod head between pluckings, the thin portion of piston rod boundary end face and this Steel Cable Baffle Ring tightly; Second kind is that described lower piston body endoporus mainly is made up of positioning hole section and tapped hole section, the thin portion of piston rod spindle nose mainly is made up of location shaft part and threaded shaft section, and the lower piston body is fixed on the thin portion of piston rod spindle nose tightly with a upper piston body and a lower piston body that the handle that is threaded between the thin portion of piston rod spindle nose is sleeved on the thin portion of piston rod head.
Three, the bottom land of an outer ring seal groove that constitutes between described upper piston body that axially is close together mutually and lower piston body also has a little annular seal groove, the slot opening of little annular seal groove is wide less than the bottom land of outer ring seal groove, this little annular seal groove can be made on the thin portion cylinder of (or down) piston body on the bottom land that constitutes the outer ring seal groove, also can surround by the high compressive strength back-up ring, in this little annular seal groove, adorn a described main O-ring seals, adorn described sealing and guiding strip outside in the annular seal groove, constitute the sealing between piston and the inner wall of cylinder thus, the high compressive strength of described sealing and guiding strip also plays a supportive role this sealing and guiding strip between inner wall of cylinder and piston body outer ring seal groove bottom land, avoid between inner wall of cylinder and the piston body direct metal friction takes place and abrade inner wall of cylinder.
A preferred version of the present invention is: described sealing and guiding strip material adopts polyoxymethylene or nylon 66, tensile strength 〉=57MPa, compressive strength 〉=90MPa, Young's modulus 〉=1.3GPa, high abrasion, the operating temperature range that mainly is it be-40 ℃～＞100 ℃, ageing-resistant, price is low; Adorn a described little annular seal groove of main O-ring seals for one of the bottom land of an outer ring seal groove that between described upper piston body that axially is close together mutually and lower piston body, constitutes, it is made on the thin portion cylinder of (or down) piston body on the bottom land that constitutes the outer ring seal groove, and is simple in structure like this; Between described upper piston body that axially is close together mutually and lower piston body, be formed in the thin portion of piston rod spindle nose and cut a circular groove near the external end of lower piston, a Steel Cable Baffle Ring that is equipped with in the groove is placed restrictions on the upper piston body and the lower piston body that are sleeved on the thin portion of piston rod head between pluckings, the thin portion of piston rod boundary end face and this Steel Cable Baffle Ring tightly, and this structure anufacturability is better; Axially also constitute an interior annular seal groove between this upper piston body that is close together mutually and the lower piston body, a secondary O-ring seals is housed in the interior annular seal groove, constitute the sealing between piston inner hole and the thin portion of piston rod spindle nose.
The present invention compares the beneficial effect that is had with background technique: (1) is made by plastics or the reinforced plastic of tensile strength 〉=50MPa, Young's modulus 〉=1.1GPa because of a described sealing and guiding strip, and existing widely used teflon is the rectangular seal guidance tape of base matter, its tensile strength 14～25MPa, Young's modulus 0.4GPa, by contrast, Young's modulus and tensile strength increase be twice above, having solved with teflon is the material of base matter as sealing and guiding strip, and its Young's modulus and tensile strength are disliked not enough shortcoming part slightly; (2) make by high abrasion, operating temperature range＜-40 ℃～＞80 ℃, ageing-resistant plastics or reinforced plastic because of a described sealing and guiding strip, and the regulation operating life phase of maximum operation temperature scope＜-40 of Transport Machinery hydraulic lifting oil cylinder ℃～＞80 ℃, Transport Machinery generally is smaller than the lubrication friction wear-out life of wear-resistant plastic, so described plastics or reinforced plastic meet usage requirement fully, and the price of polyoxymethylene or nylon 66 etc. is lower than teflon; (3) a described sealing and guiding strip is made by plastics or the reinforced plastic of compressive strength 〉=60MPa, a slot opening of adorning a described little annular seal groove of main O-ring seals of the bottom land of an outer ring seal groove that constitutes between described again upper piston body that axially is close together mutually and the lower piston body is wide less than the bottom land of outer ring seal groove, so the high compressive strength of described sealing and guiding strip also plays a supportive role this sealing and guiding strip between the bottom land of inner wall of cylinder and piston body outer ring seal groove, avoid between inner wall of cylinder and the piston body direct metal friction taking place and abrading inner wall of cylinder, thereby the material of piston body can be used steel, and no longer use aluminium, the metal that copper etc. are softer has reduced cost of material
Description of drawings
Accompanying drawing is one embodiment of the present of invention structural drawing, and it has omitted the description to piston rod part except that the piston rod spindle nose, and the part except that the piston rod spindle nose in the piston structure has been carried out analysing and observe description.
Embodiment
Below in conjunction with embodiment and accompanying drawing thereof the present invention is further described.See also accompanying drawing, see by figure, in the present embodiment:
Piston body is made up of a upper piston body 1 and a lower piston body 5, upper piston body 1, lower piston body 5 is sleeved in the thin portion 9 of piston rod spindle nose successively, the thick portion 7 of upper side abut plunger pin spindle nose of upper piston body 1, on the boundary end face 8 of thin portion 9, a circular groove 6 is cut in outer end near lower piston body 5 in the thin portion 9 of piston rod spindle nose, a Steel Cable Baffle Ring being equipped with in the circular groove 6 13 is placed restrictions on the upper piston body 1 that is sleeved on the thin portion 9 of piston rod head and lower piston body 5 tightly pluckings 7 of piston rod, between the boundary end face 8 and this Steel Cable Baffle Ring 13 of thin portion 9, axially constitute an outer ring seal groove 4 between upper piston body 1 that is close together mutually and the lower piston body 5, the bottom land of annular seal groove 4 also has a little annular seal groove 3 outside, the slot opening of little annular seal groove 3 is wide less than the bottom land of outer ring seal groove 4, in this little annular seal groove 3, adorn main O-ring seals 12, adorn sealing and guiding strip 11 in the annular seal groove 4 outside, constitute the sealing between piston and the inner wall of cylinder thus, sealing and guiding strip 11 is made by acetal plastic, the high compressive strength of sealing and guiding strip 11 also plays a supportive role between the bottom land of inner wall of cylinder and piston body outer ring seal groove 4, avoid taking place between inner wall of cylinder and the piston body direct metal friction, also constitute an interior annular seal groove 2 between upper piston body 1 and the lower piston body 5, a secondary O-ring seals 10 is housed in the interior annular seal groove 2, constitutes the sealing between piston body endoporus and the thin portion 9 of piston rod spindle nose.
Claims (3)
1. a kind of piston sealing structure of inner servo-actuated hydraulic cylinder, mainly include piston body, a sealing and guiding strip, a main O-ring seals, a spindle nose becomes thick, the piston rod of thin portion multidiameter shaft shape, sometimes also has a Steel Cable Baffle Ring, it is characterized in that: described piston body is made up of a upper piston body and a lower piston body, a described upper piston body, a lower piston body is that the center is sleeved on together successively with the thin portion of described piston rod spindle nose, this upper piston body upper side is pluckings near this piston rod, on the thin portion boundary end face, axially constitute an outer ring seal groove between this upper piston body that is close together mutually and the lower piston body, make this upper piston body, the lower piston body is fixed on this piston rod spindle nose can two kinds of forms: first kind is to cut a circular groove near the external end of lower piston in the thin portion of piston rod spindle nose, and a described Steel Cable Baffle Ring that is equipped with in the groove is placed restrictions on the upper piston body and the lower piston body that are sleeved on the thin portion of piston rod head at piston rod pluckings tightly, between thin portion's boundary end face and this Steel Cable Baffle Ring; Second kind is that described lower piston body endoporus mainly is made up of positioning hole section and tapped hole section, the thin portion of piston rod spindle nose mainly is made up of location shaft part and threaded shaft section, and the lower piston body is fixed on the thin portion of piston rod spindle nose tightly with a upper piston body and a lower piston body that the handle that is threaded between the thin portion of piston rod spindle nose is sleeved on the thin portion of piston rod head.
2. a kind of piston sealing structure of inner servo-actuated hydraulic cylinder according to claim 1 is characterized in that a described sealing and guiding strip made by tensile strength 〉=50MPa, compressive strength 〉=60MPa, Young's modulus 〉=1.1GPa, high abrasion, operating temperature range＜-40 ℃～＞80 ℃, ageing-resistant plastics or reinforced plastic.
3. a kind of piston sealing structure of inner servo-actuated hydraulic cylinder according to claim 1, the bottom land that it is characterized in that a described outer ring seal groove also has a little annular seal groove, the slot opening of little annular seal groove is wide less than the bottom land of outer ring seal groove, this little annular seal groove can be made on the thin portion cylinder of (or down) piston body on the bottom land that constitutes the outer ring seal groove, also can surround by the high compressive strength back-up ring, in this little annular seal groove, adorn a described main O-ring seals, adorn described sealing and guiding strip outside in the annular seal groove.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101164076A CN101149116A (en) | 2006-09-22 | 2006-09-22 | Piston sealing structure of inner servo-actuated hydraulic cylinder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101164076A CN101149116A (en) | 2006-09-22 | 2006-09-22 | Piston sealing structure of inner servo-actuated hydraulic cylinder |
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| CN101149116A true CN101149116A (en) | 2008-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2006101164076A Pending CN101149116A (en) | 2006-09-22 | 2006-09-22 | Piston sealing structure of inner servo-actuated hydraulic cylinder |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103267119A (en) * | 2013-05-24 | 2013-08-28 | 大连理工大学 | Hydro-cylinder piston set block with structure easy to mount and dismount |
| CN103723067A (en) * | 2013-12-20 | 2014-04-16 | 一汽解放柳州特种汽车有限公司 | Heavy-load hydraulic lifting device |
| CN103748388A (en) * | 2011-06-27 | 2014-04-23 | 沙伯基础创新塑料知识产权有限公司 | Piston guide ring comprising polyamide-poly(arylene ether) composition |
| CN105889169A (en) * | 2014-11-13 | 2016-08-24 | 杨双来 | Hydraulic oil cylinder sectional type piston and mounting method |
| CN106382411A (en) * | 2016-10-12 | 2017-02-08 | 诸暨市亿霸电子阀门有限公司 | Sealing structure for valve rod assembly and sealing method of sealing structure |
-
2006
- 2006-09-22 CN CNA2006101164076A patent/CN101149116A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103748388A (en) * | 2011-06-27 | 2014-04-23 | 沙伯基础创新塑料知识产权有限公司 | Piston guide ring comprising polyamide-poly(arylene ether) composition |
| CN103748388B (en) * | 2011-06-27 | 2016-08-17 | 沙特基础全球技术有限公司 | Comprise the piston guide ring of polyamide-poly-(arylene ether) compositions |
| CN103267119A (en) * | 2013-05-24 | 2013-08-28 | 大连理工大学 | Hydro-cylinder piston set block with structure easy to mount and dismount |
| CN103267119B (en) * | 2013-05-24 | 2015-09-16 | 大连理工大学 | A kind of hydraulic cylinder piston chunk with structure easy to assemble |
| CN103723067A (en) * | 2013-12-20 | 2014-04-16 | 一汽解放柳州特种汽车有限公司 | Heavy-load hydraulic lifting device |
| CN105889169A (en) * | 2014-11-13 | 2016-08-24 | 杨双来 | Hydraulic oil cylinder sectional type piston and mounting method |
| CN106382411A (en) * | 2016-10-12 | 2017-02-08 | 诸暨市亿霸电子阀门有限公司 | Sealing structure for valve rod assembly and sealing method of sealing structure |
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| C06 | Publication | ||
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Suzhou Zhongou Automobile Co., Ltd. Assignor: Shanghai Zhongou Auto Electric Equipment Co., Ltd. Contract fulfillment period: 2009.1.10 to 2016.1.9 contract change Contract record no.: 2009320000304 Denomination of invention: Piston sealing structure of inner servo-actuated hydraulic cylinder License type: Exclusive license Record date: 2009.3.10 |
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| LIC | Patent licence contract for exploitation submitted for record |
Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.1.10 TO 2016.1.9; CHANGE OF CONTRACT Name of requester: SUZHOU ZHONGOU AUTOMOBILE CO., LTD. Effective date: 20090310 |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |