CN107228195A - A kind of combination sealing method on undercarriage - Google Patents
A kind of combination sealing method on undercarriage Download PDFInfo
- Publication number
- CN107228195A CN107228195A CN201610177519.6A CN201610177519A CN107228195A CN 107228195 A CN107228195 A CN 107228195A CN 201610177519 A CN201610177519 A CN 201610177519A CN 107228195 A CN107228195 A CN 107228195A
- Authority
- CN
- China
- Prior art keywords
- seal
- sealing
- ring seals
- ptfe
- combination
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Devices (AREA)
Abstract
The invention provides a kind of combination sealing method on undercarriage, it is characterised in that comprises the following steps：Step one：From combined sealing structure, combination dynamic sealing device is made up of O-ring seals and PTFE seal two parts, O-ring seals are sleeved on PTFE seal periphery, and wherein O-ring seals are used to provide radial pressure and static seal, and PTFE seal realizes the effect of hydraulic seal by sealing sword；Step 2：Combined sealing structure pre compressed magnitude is set, static seal decrement typically takes 15%~30%, and dynamic sealing compression measures 10%~15%.
Description
Technical field
The present invention relates to encapsulating method technical field.
Background technology
The serial owner's undercarriage sealing structures of Z9 are single seal form of traditional O-ring seal, and in the case where buffer work instantaneous pressure is larger seepage easily occurs for this sealing structure, and startup frictional force is larger, reduction buffer work ride comfort.The temperature range that rubber packing material can adapt to is small, is influenceed the life-span low by operating temperature.The adaptability of working media is single, poor compatibility.And may be squeezed into gap at elevated pressures and cause seal failure.
Z9 type owner's undercarriages damper leg is used to keep inner chamber gas pressure, and absorbs during stretching motion the ground shock energy of helicopter.The structure type of former O-ring seals, during undercarriage use, when and occur the phenomenons such as damper leg seepage.
The content of the invention
Combination sealing method on a kind of undercarriage of the present invention, it is characterised in that comprise the following steps：
Step one：From combined sealing structure, combination dynamic sealing device is made up of O-ring seals and PTFE seal two parts, O-ring seals are sleeved on PTFE seal periphery, and wherein O-ring seals are used to provide radial pressure and static seal, and PTFE seal realizes the effect of hydraulic seal by sealing sword.
This programme substitutes former O-ring seals using combination dynamic sealing device.Main landing gear inner cylinder can be moved up and down during stand under load along axis direction, and the dust for being attached to inner cylindrical surface together can upwards be moved with inner cylinder.Combination dynamic sealing device can effectively prevent external dust particle from entering inside damper leg.
Step 2：Combined sealing structure pre compressed magnitude is set, static seal decrement typically takes 15%~30%, and dynamic sealing compression measures 10%~15%.
The first Application combination sealing technology in the undercarriage of our factory autonomous Design.Have the advantages that compared with traditional O-ring seal two it is prominent, one is long lifespan, can be reached 15 years, and original domestic cushion rubber can only achieve 5 years, and a small number of domestic advanced elastomeric materials can be used 8 years.Another advantage is that frictional force is small.Coefficient of friction is 0.8 (when unlubricated) between rubber and steel, and coefficient of friction is 0.1 (when unlubricated) between PTFE polytetrafluoroethylene (PTFE) and steel.
Brief description of the drawings
Fig. 1 prior art sealing rings are squeezed into gap schematic diagram；
Fig. 2 sealed structural representations of the present invention.
Embodiment
Step one：From polytetrafluoroethylmaterial material
Polytetrafluoroethylene (PTFE) (PTFE) is a kind of high performance engineering plastics, and its coefficient of friction is minimum in all substances, is suitable for use as very much sealing ring material, is used in combination with rubber seal, makes combination sealing.
From combined sealing structure, combination dynamic sealing device is made up of O-ring seals and PTFE seal two parts, O-ring seals are sleeved on PTFE seal periphery, and wherein O-ring seals are used to provide radial pressure and static seal, and PTFE seal realizes the effect of hydraulic seal by sealing sword.
This programme substitutes former O-ring seals using combination dynamic sealing device, O-ring seals in combination dynamic sealing device are used to provide radial pressure, and PTFE seal elasticity is small, coefficient of friction is low, both, which coordinate, can give full play to their advantage, both sealing effectiveness can have been increased, seepage is reduced, frictional force can be reduced again, effectively dissolved the contradiction of frictional force and sealing effectiveness each other.
Step 2：Rationally design seal decrement, prevents from revealing at low temperature
Due to decline of the hydraulic oil with temperature, seal can be shunk, and seal is reduced to the pressure of workpiece, once less than hydraulic cavities operating pressure, it may result in leakage.So the pre compressed magnitude of seal will consider to compensate its low-temperature shrink amount.Static seal decrement typically takes 15%~30%, and because the present invention is dynamic sealing, so decrement should be smaller, scope is between 10%~15%.Compared to old O-ring seal, the frictional force of PTFE seal is much smaller, it is possible to increase some decrements, and this also complies with foregoing low-temperature shrink effect, so finally we have selected 15% decrement.
Claims (1)
1. a kind of combination sealing method on undercarriage, it is characterised in that comprise the following steps：
Step one：From combined sealing structure, combination dynamic sealing device is made up of O-ring seals and PTFE seal two parts,
O-ring seals are sleeved on PTFE seal periphery, and wherein O-ring seals are used to provide radial pressure and static seal, and PTFE
Seal realizes the effect of hydraulic seal by sealing sword；
Step 2：Combined sealing structure pre compressed magnitude is set, static seal decrement typically takes 15%~30%, dynamic sealing decrement
Take 10%~15%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610177519.6A CN107228195A (en) | 2016-03-25 | 2016-03-25 | A kind of combination sealing method on undercarriage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610177519.6A CN107228195A (en) | 2016-03-25 | 2016-03-25 | A kind of combination sealing method on undercarriage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107228195A true CN107228195A (en) | 2017-10-03 |
Family
ID=59932514
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610177519.6A Pending CN107228195A (en) | 2016-03-25 | 2016-03-25 | A kind of combination sealing method on undercarriage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107228195A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1090634A (en) * | 1993-12-16 | 1994-08-10 | 冶金工业部自动化研究院 | Self balance combined high pressure rotary sealing ring |
| CN2641387Y (en) * | 2003-09-19 | 2004-09-15 | 徐州车氏密封有限公司 | L shape sliding ring type combined sealing |
| CN2793457Y (en) * | 2005-02-16 | 2006-07-05 | 徐州车氏密封有限公司 | T-shaped two-way rotary assembled sealing ring |
| CN102628338A (en) * | 2011-06-20 | 2012-08-08 | 成都盛帮密封件股份有限公司 | Novel roller bit sealing ring |
| JP2013185702A (en) * | 2012-03-12 | 2013-09-19 | Kawasaki Heavy Ind Ltd | Sliding seal and combined sliding seal |
-
2016
- 2016-03-25 CN CN201610177519.6A patent/CN107228195A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1090634A (en) * | 1993-12-16 | 1994-08-10 | 冶金工业部自动化研究院 | Self balance combined high pressure rotary sealing ring |
| CN2641387Y (en) * | 2003-09-19 | 2004-09-15 | 徐州车氏密封有限公司 | L shape sliding ring type combined sealing |
| CN2793457Y (en) * | 2005-02-16 | 2006-07-05 | 徐州车氏密封有限公司 | T-shaped two-way rotary assembled sealing ring |
| CN102628338A (en) * | 2011-06-20 | 2012-08-08 | 成都盛帮密封件股份有限公司 | Novel roller bit sealing ring |
| JP2013185702A (en) * | 2012-03-12 | 2013-09-19 | Kawasaki Heavy Ind Ltd | Sliding seal and combined sliding seal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20171003 |