CN105201957A - Piston plane self-sealing structure for hydraulic cylinder - Google Patents
Piston plane self-sealing structure for hydraulic cylinder Download PDFInfo
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- CN105201957A CN105201957A CN201510577757.1A CN201510577757A CN105201957A CN 105201957 A CN105201957 A CN 105201957A CN 201510577757 A CN201510577757 A CN 201510577757A CN 105201957 A CN105201957 A CN 105201957A
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- hydraulic cylinder
- sealing structure
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Abstract
The invention discloses a piston plane self-sealing structure for a hydraulic cylinder. A side D and a side E are contacted with each other to form a closed ring, wherein the finish degree of the side D ranges from 3.0 to 3.3, and the perpendicularity with a threaded side of a piston rod is larger than or equal to 0.05; the finish degree of the side E ranges from 1.5 to 1.7, and the perpendicularity with the threaded side of the piston is larger than or equal to 0.05. With adoption of the scheme, the sealing effect can be realized finally only through certain plastic deformation generated by the side D of the piston rod and the side E of the piston due to pre-tightening force after the piston is tightened, a system realizing sealing merely through surface contact of workpieces is formed, sealing elements are not needed, and the sealing has the characteristics that the higher the pressure is, the larger the pressing force of the sealing original pieces on the contact surfaces is and the better the sealing performance is.
Description
Technical field
The present invention relates to hydraulic cylinder piston field of sealing technology, particularly relate to a kind of hydraulic cylinder piston plane self sealing structure.
Background technique
Oil cylinder internal leakage is one of modal fault of oil hydraulic cylinder.The reason of internal leakage is caused to mainly contain a lot:
1. oil cylinder processing problems, as too low in inner hole of cylinder roughness, endoporus cylindricity is too low, and on piston, groove degree of finish is poor.
2. sealing is selected unreasonable, or Sealing is aging, inefficacy.
3. oil cylinder uses problem, and the too high oil cylinder that causes of system pressure swells, and overload, causes cylinder bore to be pulled.
General Normal hydraulic oil cylinder must design seal ring to prevent from producing internal leakage in cylinder efficient process when designing on piston, and internal leakage has two-part: 1 is from the clearance leakage between piston and cylinder barrel; 2 is from the clearance leakage between piston and piston rod.
Often because actual use working pressure is too high, the seal ring of 2 internal leakages place can be damaged in oil hydraulic cylinder and cause oil cylinder internal leakage.
Summary of the invention
The technical problem that the present invention mainly solves is to provide a kind of deficiency overcome in the design of existing piston seal, can ensure the hydraulic cylinder piston plane self sealing structure that the normal safe of oil cylinder runs.
For solving the problems of the technologies described above, the technological scheme that the present invention adopts is: provide a kind of hydraulic cylinder piston plane self sealing structure, comprise: piston rod and piston, one end face of setting piston rod is D face, one end face of piston is E face, D face and E face contact with each other formation one closed loop, and wherein the degree of finish in D face is between 3.0-3.3, and the perpendicularity between the flank of thread on piston rod is more than or equal to 0.05; E face degree of finish is between 1.5-1.7, and the perpendicularity between the flank of thread of piston is more than or equal to 0.05.
In a preferred embodiment of the present invention, E face is provided with step surface, and the width of this step surface is 0.25mm-0.5mm.
In a preferred embodiment of the present invention, the end grain in D face and E face is concentric circles texture.
In a preferred embodiment of the present invention, E face is provided with lubricating layer.
In a preferred embodiment of the present invention, the pretightening force in E face is greater than the thrust destroying sealing surface.
The invention has the beneficial effects as follows: the present invention cancels seal ring, only tighten back piston bar D face and piston E face by piston because certain plastic deformation of producing of pretightening force, finally reach the effect of sealing, define a kind of Sealing that do not need and only contact by the face of workpiece itself system carrying out sealing, the feature of this sealing is that pressure is higher, sealing original paper is larger in the impacting force of surface of contact, and sealability is also better.
Accompanying drawing explanation
In order to be illustrated more clearly in the technological scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings, wherein:
Fig. 1 is the structural representation of a preferred embodiment of piston rod and piston in hydraulic cylinder piston plane self sealing structure of the present invention;
Fig. 2 is the structure for amplifying schematic diagram in E face in the plane of hydraulic cylinder piston shown in Fig. 1 self sealing structure;
Fig. 3 is the ssembly drawing of the plane of hydraulic cylinder piston shown in Fig. 1 self sealing structure;
In accompanying drawing, the mark of each parts is as follows: 1, piston rod, and 2, piston, 3, D face, 4, E face, 5, flank of thread, 6, step surface.
Embodiment
Be clearly and completely described to the technological scheme in the embodiment of the present invention below, obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.
Refer to Fig. 1, the embodiment of the present invention comprises:
A kind of hydraulic cylinder piston plane self sealing structure, comprising: piston rod 1 and piston 2, and an end face of setting piston rod 1 is D face 3, and an end face of piston 2 is E face 4.
Prior art is added with seal ring between piston rod 1 and piston 2, and seal ring is cancelled by the present invention, and the E face 4 in the D face 3 and piston 2 of only tightening back piston bar 1 by piston contacts with each other formation one closed loop, realizes the effect of sealing.
Wherein the degree of finish in D face 3 is between 3.0-3.3, and the perpendicularity between the flank of thread 5 on piston rod 1 is more than or equal to 0.05.
E face 4 degree of finish is between 1.5-1.7, and the perpendicularity between the flank of thread 5 of piston 2 is more than or equal to 0.05.So process a step surface 6 to ensure its behavior tolerance in E face when machining screw simultaneously.The width of this step surface 6 is 0.25mm-0.5mm, as shown in Figure 2.
E face 4 is provided with lubricating layer.On piston 2, oil lubrication must be coated in E face 4, to reduce piston and plunger rod contacts face friction factor, and will give the pretightening force enough with piston.Because piston has at the P of the sealing surface that is damaged the possibility producing certain gap to piston during thrust and rod seal face, this just likely produces internal leakage.So pretightening force must be greater than P that piston bears to thrust, be that sealing surface ensures sealing, as shown in Figure 3.
Because want the Rz value of applanation surface roughness just to have first condition of composition closed loop.And sealing surface surface roughness determines according to design code and the required most economical process means of sealing intensity (sealing grade) that will reach to ensure to reach sealing pair defined, so be a specified value, increase roughness then seal degree does not reach, reduce roughness, then manufacture cost increases, uneconomical, therefore can only allow piston E face by pretightening force to flatten the Rz value in piston rod D face, composition closed loop.
If sealing surface surface irregularity is too large, also can only cause localized contact by overcoming Rz value, this localized contact differs and creates the condition of composition seal ring surely.So sealing surface surface irregularity is an independent independently factor.
Processing texture has various ways, but is concentric circles texture for the end grain in the optimal D face of sealing surface and E face.When for radial or any direction texture, can could form closed loop by overcoming Rz value, so it is not a crucial factor
Specific pressure is an important factor, changes the balance that specific pressure can make various factors reach new, thus keep the sealing of sealing pair during the change of surface roughness, surface texture etc.So specific pressure plays a part very important in sealing pair, some other factor is all subordinated to it, and therefore specific pressure is also an independent independently factor.
Two side pressure difference problems, in fact a sealing load problem can be regarded as, because just there is not a sealing problem when two side pressure are equal, and pressure is an initial parameter, the change of pressure will cause the change of series of factors, just need the difference according to pressure and to change and can the change of specific pressure make be driven plain as surface roughness and create the formation condition forming minimum sealing condition-closed loop as specific pressure.Therefore pressure reduction is a prevailing independent factor.
The present invention cancels seal ring, only tighten back piston bar D face and piston E face by piston because certain plastic deformation of producing of pretightening force, finally reach the effect of sealing, define a kind of Sealing that do not need and only contact by the face of workpiece itself system carrying out sealing, the feature of this sealing is that pressure is higher, sealing original paper is larger in the impacting force of surface of contact, and sealability is also better.
The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every utilize description of the present invention to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical field, be all in like manner included in scope of patent protection of the present invention.
Claims (5)
1. a hydraulic cylinder piston plane self sealing structure, comprise: piston rod and piston, one end face of setting piston rod is D face, one end face of piston is E face, it is characterized in that, D face and E face contact with each other formation one closed loop, and wherein the degree of finish in D face is between 3.0-3.3, and the perpendicularity between the flank of thread on piston rod is more than or equal to 0.05; E face degree of finish is between 1.5-1.7, and the perpendicularity between the flank of thread of piston is more than or equal to 0.05.
2. hydraulic cylinder piston plane self sealing structure according to claim 1, it is characterized in that, E face is provided with step surface, and the width of this step surface is 0.25mm-0.5mm.
3. hydraulic cylinder piston plane self sealing structure according to claim 1, is characterized in that, the end grain in D face and E face is concentric circles texture.
4. hydraulic cylinder piston plane self sealing structure according to claim 1, it is characterized in that, E face is provided with lubricating layer.
5. hydraulic cylinder piston plane self sealing structure according to claim 1, is characterized in that, the pretightening force in E face is greater than the thrust destroying sealing surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510577757.1A CN105201957A (en) | 2015-09-14 | 2015-09-14 | Piston plane self-sealing structure for hydraulic cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510577757.1A CN105201957A (en) | 2015-09-14 | 2015-09-14 | Piston plane self-sealing structure for hydraulic cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105201957A true CN105201957A (en) | 2015-12-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510577757.1A Pending CN105201957A (en) | 2015-09-14 | 2015-09-14 | Piston plane self-sealing structure for hydraulic cylinder |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09159023A (en) * | 1995-12-05 | 1997-06-17 | Toyota Motor Corp | Piston ring |
| US7028817B1 (en) * | 2005-06-17 | 2006-04-18 | Randall Charles Anderson | Pressure adjustable shock and method |
| CN203568801U (en) * | 2013-11-20 | 2014-04-30 | 无锡市明珠烤漆厂 | Sealing filter structure of tilt cylinder of forklift |
| CN203685749U (en) * | 2013-12-02 | 2014-07-02 | 南通富仕液压机床有限公司 | Ejector cylinder with two-way piston rod |
| CN103939419A (en) * | 2013-09-30 | 2014-07-23 | 湖北江山液压科技有限公司 | Hydraulic cylinder constant throttling adjustable buffering device |
| CN205025863U (en) * | 2015-09-14 | 2016-02-10 | 江苏恒立高压油缸股份有限公司 | Hydraulic cylinder piston plane is from seal structure |
-
2015
- 2015-09-14 CN CN201510577757.1A patent/CN105201957A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09159023A (en) * | 1995-12-05 | 1997-06-17 | Toyota Motor Corp | Piston ring |
| US7028817B1 (en) * | 2005-06-17 | 2006-04-18 | Randall Charles Anderson | Pressure adjustable shock and method |
| CN103939419A (en) * | 2013-09-30 | 2014-07-23 | 湖北江山液压科技有限公司 | Hydraulic cylinder constant throttling adjustable buffering device |
| CN203568801U (en) * | 2013-11-20 | 2014-04-30 | 无锡市明珠烤漆厂 | Sealing filter structure of tilt cylinder of forklift |
| CN203685749U (en) * | 2013-12-02 | 2014-07-02 | 南通富仕液压机床有限公司 | Ejector cylinder with two-way piston rod |
| CN205025863U (en) * | 2015-09-14 | 2016-02-10 | 江苏恒立高压油缸股份有限公司 | Hydraulic cylinder piston plane is from seal structure |
Non-Patent Citations (1)
| Title |
|---|
| 赵建中: "《机械制造基础 第二版》", 28 February 2013 * |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 213000 Wujin high tech Zone, Jiangsu Province, No. long hidden Road, No. 99 Applicant after: JIANGSU HENGLI HYDRAULIC CO., LTD. Address before: 213000 Wujin high tech Zone, Jiangsu Province, No. long hidden Road, No. 99 Applicant before: Jiangsu Hengli High Pressure Oil Cylinder Co., Ltd. |
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| COR | Change of bibliographic data | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20151230 |
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| RJ01 | Rejection of invention patent application after publication |