CN104074980A - Sealing structure - Google Patents
Sealing structure Download PDFInfo
- Publication number
- CN104074980A CN104074980A CN201410115252.9A CN201410115252A CN104074980A CN 104074980 A CN104074980 A CN 104074980A CN 201410115252 A CN201410115252 A CN 201410115252A CN 104074980 A CN104074980 A CN 104074980A
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- Prior art keywords
- mentioned
- ring
- seal groove
- bar
- sealing component
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- Granted
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 59
- 229920003225 polyurethane elastomer Polymers 0.000 claims abstract description 10
- 244000043261 Hevea brasiliensis Species 0.000 claims abstract description 7
- 229920003052 natural elastomer Polymers 0.000 claims abstract description 7
- 229920001194 natural rubber Polymers 0.000 claims abstract description 7
- 229920003051 synthetic elastomer Polymers 0.000 claims abstract description 7
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 7
- 239000000057 synthetic resin Substances 0.000 claims abstract description 7
- 239000005061 synthetic rubber Substances 0.000 claims abstract description 7
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 6
- 238000010276 construction Methods 0.000 claims description 21
- 239000000428 dust Substances 0.000 description 13
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 description 6
- 229920005749 polyurethane resin Polymers 0.000 description 4
- 238000007493 shaping process Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
Landscapes
- Sealing Devices (AREA)
- Actuator (AREA)
Abstract
The invention provides a sealing structure which can improve wearing resistance and sealing performance and realizes long service life of the sealing. A back ring (230) of the sealing structure comprises the components of: a first annular area which extends along a radial direction and abuts against a sliding ring (210); and a second annular area which extends in a direction that is orthogonal to the first annular area and is arranged at an outer radius direction side of a supporting ring (220) when viewed in a radial direction. The sliding ring (210) is made of hard polyurethane rubber. The supporting ring (220) is made of thermoplastic resin. The back ring (230) is made of synthetic resin, natural rubber or synthetic rubber.
Description
Technical field
The present invention relates to a kind of seal construction, particularly relate to the seal construction using in a kind of bar (piston rod) in hydropneumatic equipment etc. and the glade plane space between cylinder body.
Background technique
For example, in glade plane space between cylinder body in hydraulic equipment and bar (piston rod), in order to prevent that the working oil that imports to grease chamber from leaking (working oil leaks from high side to low side), and realize swimmingly the back and forth movement of bar, adopted the seal construction that has been embedded in sealing component to the seal groove of being located at cylinder body.This seal construction has disclosed in TOHKEMY 2005-337440 communique etc.
In recent years, in order to improve the sealability of being brought by seal construction, except the 1st sealing component as primary seal member, be also provided with the 2nd sealing component of support.In the 1st sealing component, use the synthetic resin such as polyurethane resin, natural rubber or synthetic rubber as primary seal.In the 2nd sealing component, use PTFE (polytetrafluoroethylene: teflon).
Particularly the 2nd sealing component, expects further to improve wear resistance performance, improve sealing and make to seal long lifetime.
Summary of the invention
The present invention completes in order to address the above problem, and provides a kind of and can improve wear resistance performance, improves sealing and make to seal the seal construction of long lifetime.
In based on seal construction of the present invention, seal construction is located at the glade plane space between cylinder body and the bar in hydropneumatic equipment, and separates high pressure side and low voltage side, wherein, sealing structure comprises: seal groove, the circumferentially setting in the form of a ring of its outer circumferential face along above-mentioned bar; And sealing component, it is accommodated in the inside of above-mentioned seal groove, for stopping up the glade plane space between above-mentioned cylinder body and above-mentioned bar.
Above-mentioned sealing component comprises: slip ring, and it contacts with the outer circumferential face of above-mentioned bar; Support ring, it is disposed at above-mentioned low voltage side with respect to above-mentioned slip ring, and from radially observing, width arranges widelyr than the width of above-mentioned slip ring; And back of the body ring, from radially observing, this back of the body ring is positioned at than the position of above-mentioned slip ring and the outer footpath of above-mentioned support ring direction side, and presses above-mentioned slip ring to above-mentioned bar side.
Above-mentioned back of the body ring comprises: the 1st ring region, and it radially extends and connects with above-mentioned slip ring; And the 2nd ring region, its edge and the above-mentioned the 1st is encircled the orthogonal direction in region and is extended, and from the above-mentioned position of radially observing the external diameter direction side that is positioned at above-mentioned support ring, above-mentioned slip ring is formed by hard polyurethane rubber, above-mentioned support ring is formed by thermoplastic resin, and above-mentioned back of the body ring is formed by synthetic resin, natural rubber or synthetic rubber.
In other technologies scheme, sealing structure comprises: the 1st seal groove, the circumferentially setting in the form of a ring of its outer circumferential face along above-mentioned bar; The 2nd seal groove, the circumferentially setting in the form of a ring of its outer circumferential face along above-mentioned bar, and be positioned at than above-mentioned the 1st seal groove by above-mentioned on high-tension side position; The 1st sealing component, it is accommodated in the inside of above-mentioned the 1st seal groove, for stopping up the glade plane space between above-mentioned cylinder body and above-mentioned bar; And the 2nd sealing component, it is accommodated in the inside of above-mentioned the 2nd seal groove, and for stopping up the glade plane space between above-mentioned cylinder body and above-mentioned bar, above-mentioned seal groove forms above-mentioned the 2nd seal groove, and above-mentioned sealing component forms above-mentioned the 2nd sealing component.
In other technologies scheme, sealing structure also comprises: the 3rd seal groove, its across above-mentioned the 1st seal groove with above-mentioned the 2nd seal groove opposition side circumferentially arranging in the form of a ring along the outer circumferential face of above-mentioned bar; And the 3rd sealing component, it is accommodated in the inside of above-mentioned the 3rd seal groove, for stopping up the glade plane space between above-mentioned cylinder body and above-mentioned bar.
Above-mentioned and other object of the present invention, feature, situation and advantage can be according to associated with accompanying drawing that understand, clear and definite about obtaining below of the present invention.
Brief description of the drawings
Fig. 1 is the sectional view of the seal construction that represents that the hydraulic equipment in mode of execution adopts.
Fig. 2 is the stereogram that represents to form the structure of the slip ring of the 2nd sealing component in mode of execution.
Fig. 3 is the stereogram that represents to form the structure of the support ring of the 2nd sealing component in mode of execution.
Fig. 4 is the stereogram that represents to form the structure of the back of the body ring of the 2nd sealing component in mode of execution.
Fig. 5 is that in Fig. 4, V-V alignment is looked sectional view.
Embodiment
Below, with reference to the accompanying drawings of the seal construction based in each mode of execution of the present invention.In each mode of execution of following explanation, in the situation that mentioning number, amount etc., unless recorded especially, scope of the present invention needn't be defined in this number, amount etc.For Same Part, suitable part, sometimes mark same reference character, and the no longer explanation of repetition.Below, as an example of hydropneumatic equipment, enumerate hydraulic cylinder, but be not limited to hydraulic cylinder, can be widely used in hydropneumatic equipment.
(seal construction)
With reference to Fig. 1, the seal construction in present embodiment is described.Fig. 1 is the sectional view of the seal construction that represents that the hydraulic cylinder in mode of execution adopts.In Fig. 1, cylinder body 1 and bar (piston rod) 2 for convenience of explanation and illustrate with dotted line.Seal construction shown in Fig. 1 along with and bar 2 between crimping and the back and forth movement (above-below direction in Fig. 1) of bar 2 and being out of shape, but in order clearly to understand seal construction, illustrate the state of not exerting pressure in seal construction.
Along the 1st seal groove 10A that is circumferentially with ring-type of the outer circumferential face of bar 2.In the 1st seal groove 10A, be accommodated with the 1st sealing component 10 for stopping up the glade plane space between cylinder body 1 and bar 2.The 1st sealing component 10 forms primary seal member 10.
Be provided with the 2nd seal groove 20A than the 1st seal groove 10A by high-tension side position, the 2nd seal groove 20A is along the circumferentially setting in the form of a ring of the outer circumferential face of bar 2.In view, side is provided with the hydraulic chamber of high pressure up.In the 2nd seal groove 20A, be accommodated with the 2nd sealing component 20 for stopping up the glade plane space between cylinder body 1 and bar 2.The 2nd sealing component 20 forms auxiliary seal member.
In the present embodiment, be provided with the 3rd seal groove 30A, the 3rd seal groove 30A across the 1st seal groove 10A with the 2nd seal groove 20A opposition side circumferentially arranging in the form of a ring along the outer circumferential face of bar 2.In the 3rd seal groove 30A, be accommodated with the 3rd sealing component 30 for stopping up the glade plane space between cylinder body 1 and bar 2.The 3rd sealing component 30 is configured for preventing the dust sealing member 30 from outside dust intrusion.
In view, a side that is provided with hydraulic chamber of upper side becomes high pressure side, and lower side becomes the low voltage side of atmosphere.In the present embodiment, adopted the structure that is provided with dust sealing member, but dust sealing member is as long as arrange as required.
(primary seal member 10)
Primary seal member 10 be included in high pressure side have the side opened, sectional shape is primary seal 110 and the main support ring 180 of roughly U word shape.Primary seal 110 is positioned at high pressure side, and main support ring 180 is positioned at low voltage side.
Primary seal 110 entirety have the form of ring-type, utilize the synthetic resin such as polyurethane resin, natural rubber or synthetic rubber one-body molded.Main support ring 180 entirety have the form of ring-type, by rigidity, intensity and creep resistance than shapings such as the thermoplastic resins of primary seal 110 excellences.The distortion to low voltage side of the primary seal 110 when main support ring 180 restrictions have pressure.
(dust sealing member 30)
Dust sealing member 30 be included in bar 2 sides have the side opened, sectional shape is main dust seal 310 and the dustproof support ring 380 of roughly U word shape.From radially observing, main dust seal 310 is positioned at bar 2 sides, and dustproof support ring 380 is positioned at the position by outer circumferential side than main dust seal 310.
Main dust seal 310 entirety have the form of ring-type, utilize the synthetic resin such as polyurethane resin, natural rubber or synthetic rubber one-body molded.Dustproof support ring 380 entirety have the form of ring-type, by rigidity, intensity and creep resistance than shapings such as the thermoplastic resins of main dust seal 310 excellences.Dustproof support ring 380 is pressed main dust seal 310 to bar 2 sides in the time that bar 2 slides.
(the 2nd sealing component 20)
With reference to Fig. 1～Fig. 5, describe the 2nd sealing component 20 in detail.Fig. 2 is the stereogram that represents the structure of the slip ring 210 that forms the 2nd sealing component 20, Fig. 3 is the stereogram that represents the structure of the support ring 220 that forms the 2nd sealing component 20, Fig. 4 is the stereogram that represents the structure of the back of the body ring 230 that forms the 2nd sealing component 20, and Fig. 5 is that in Fig. 4, V-V alignment is looked sectional view.
As shown in Figure 1, the 2nd sealing component 20 comprise the slip ring 210 that contacts with the outer circumferential face of bar 2, with respect to slip ring 210 be configured in low voltage side and from radially observing, width arranges to such an extent that be positioned at than the position of slip ring 210 and the outer footpath of support ring 220 direction side and press the back of the body ring 230 of slip ring 210 to bar 2 sides than the wide support ring 220 of the width of slip ring 210 and from radially observing.
(slip ring 210)
As shown in Figure 2, slip ring 210 entirety have the form of ring-type, and in upper surface side (high pressure side), at 4 positions, (90 ° of intervals) is provided with notch part 212.Slip ring 210 is formed by the hard polyurethane rubber more soft than PTFE.The shore hardness of hard polyurethane rubber is about 60～75(HD).
Position and the quantity of notch part 212 suitably change according to specification.Slip ring 210 contacts with the outer circumferential face of bar 2, alleviates the load to primary seal 110 under high pressure use.
By use hard polyurethane rubber in slip ring 210, can improve the installation capability of installing to the 2nd seal groove 20A when PTFE than using.According to the mechanical strength property of hard polyurethane rubber, also can seek the raising of sealing, the long lifetime of sealing.
The Shore D hardness of hard polyurethane rubber is about 60～75(HD), tensile strength (MPa) is about 54～56(MPa), elongation percentage (%) is 350～400(%).On the other hand, the Shore D hardness of PTFE is about 60～73(HD), tensile strength (MPa) is about 19～28(MPa), elongation percentage (%) is 240～350(%).
(support ring 220)
As shown in Figure 3, with regard to support ring 220, cross section is essentially rectangular, and entirety has the form of ring-type, and width arranges widelyr than the width of slip ring 210.
Support ring 220 by rigidity, intensity and creep resistance than shapings such as the thermoplastic resins of slip ring 210 excellences.It is outstanding to low voltage side that support ring 220 suppresses slip ring 210 in the time that bar 2 slides.
(back of the body ring 230)
As shown in Figure 4 and Figure 5, back of the body ring 230 entirety have the form of ring-type, comprise the 1st ring region 231 of radially extending and connect with slip ring 210 and along and the orthogonal direction in the 1st ring region 231 is extended and from radially observing the 2nd ring region 232 of the external diameter direction side that is positioned at support ring 220.
Back of the body ring 230 utilizes the synthetic resin such as polyurethane resin, natural rubber or synthetic rubber one-body molded.Back of the body ring 230 is pressed slip ring 210 to bar 2 in the time that bar 2 slides.As mentioned above, encircle 230 the 1st ring region 231 by the back of the body and connect with slip ring 210, thereby guarantee the sufficient area of contact that pressing lever 2 is required.
Above, according to the seal construction in present embodiment, by use hard polyurethane rubber in slip ring 210, can improve the installation capability (handling property) of installing to the 2nd seal groove 20A when PTFE than using.According to the wear resistance performance of hard polyurethane rubber, also can seek the raising of sealing, the long lifetime of sealing.
And, by the 1st ring region 231 of pressing slip ring 210 to bar 2 is set on back of the body ring 230, can guarantee the sufficient area of contact that pressing lever 2 is required.
In the above-described embodiment, illustrate in the 2nd sealing component 20 and applied situation of the present invention, but can in primary seal member 10 and dust sealing member 30, apply structure of the present invention.
Embodiments of the present invention have been described, but should think, current disclosed mode of execution is all to illustrate and unrestricted in all respects.Scope of the present invention illustrates by claims, represent to comprise with the meaning and the scope of claims equalization in all changes.
Claims (3)
1. a seal construction, it is located at the glade plane space between cylinder body and the bar in hydropneumatic equipment, and separates high pressure side and low voltage side, and wherein, sealing structure comprises:
Seal groove, the circumferentially setting in the form of a ring of its outer circumferential face along above-mentioned bar; And
Sealing component, it is accommodated in the inside of above-mentioned seal groove, for stopping up the glade plane space between above-mentioned cylinder body and above-mentioned bar,
Above-mentioned sealing component comprises:
Slip ring, it contacts with the outer circumferential face of above-mentioned bar;
Support ring, it is disposed at above-mentioned low voltage side with respect to above-mentioned slip ring, and from radially observing, width arranges widelyr than the width of above-mentioned slip ring; And
Back of the body ring, from radially observing, this back of the body ring is positioned at than the position of above-mentioned slip ring and the outer footpath of above-mentioned support ring direction side, and presses above-mentioned slip ring to above-mentioned bar side,
Above-mentioned back of the body ring comprises: the 1st ring region, and it radially extends and connects with above-mentioned slip ring; And the 2nd ring region, its along and above-mentioned the 1st orthogonal direction in ring region extend, and from the above-mentioned position of radially observing the external diameter direction side that is positioned at above-mentioned support ring,
Above-mentioned slip ring is formed by hard polyurethane rubber,
Above-mentioned support ring is formed by thermoplastic resin,
Above-mentioned back of the body ring is formed by synthetic resin, natural rubber or synthetic rubber.
2. seal construction according to claim 1, wherein,
Sealing structure comprises:
The 1st seal groove, the circumferentially setting in the form of a ring of its outer circumferential face along above-mentioned bar;
The 2nd seal groove, the circumferentially setting in the form of a ring of its outer circumferential face along above-mentioned bar, and be positioned at than above-mentioned the 1st seal groove by above-mentioned on high-tension side position;
The 1st sealing component, it is accommodated in the inside of above-mentioned the 1st seal groove, for stopping up the glade plane space between above-mentioned cylinder body and above-mentioned bar; And
The 2nd sealing component, it is accommodated in the inside of above-mentioned the 2nd seal groove, for stopping up the glade plane space between above-mentioned cylinder body and above-mentioned bar,
Above-mentioned seal groove forms above-mentioned the 2nd seal groove,
Above-mentioned sealing component forms above-mentioned the 2nd sealing component.
3. seal construction according to claim 2, wherein,
Sealing structure also comprises:
The 3rd seal groove, its across above-mentioned the 1st seal groove with above-mentioned the 2nd seal groove opposition side circumferentially arranging in the form of a ring along the outer circumferential face of above-mentioned bar; And
The 3rd sealing component, it is accommodated in the inside of above-mentioned the 3rd seal groove, for stopping up the glade plane space between above-mentioned cylinder body and above-mentioned bar.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013063991A JP2014190362A (en) | 2013-03-26 | 2013-03-26 | Seal structure |
| JP2013-063991 | 2013-03-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104074980A true CN104074980A (en) | 2014-10-01 |
| CN104074980B CN104074980B (en) | 2016-05-11 |
Family
ID=51596461
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410115252.9A Active CN104074980B (en) | 2013-03-26 | 2014-03-26 | Seal construction |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2014190362A (en) |
| CN (1) | CN104074980B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111473113A (en) * | 2019-01-23 | 2020-07-31 | 株式会社荒井制作所 | Sealing device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4239244A (en) * | 1978-05-26 | 1980-12-16 | Textron, Inc. | Hydraulic piston rod seal |
| JP2004251413A (en) * | 2003-02-21 | 2004-09-09 | Nok Corp | Sealing device for reciprocation spindle |
| CN1965185A (en) * | 2004-06-07 | 2007-05-16 | Nok株式会社 | Sealing system |
| CN101105226A (en) * | 2006-07-10 | 2008-01-16 | 沃尔沃建造设备控股（瑞典）有限公司 | Anticorrosion device for hydraulic cylinder in heavy construction equipment |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5836660U (en) * | 1981-09-02 | 1983-03-10 | エヌオーケー株式会社 | back spring |
| JPH0543324Y2 (en) * | 1987-08-03 | 1993-11-01 | ||
| US7341258B2 (en) * | 2004-09-24 | 2008-03-11 | Greene, Tweed Of Delaware, Inc. | Cammed seal assembly with sealing ring having an angled leg portion and foot portion with elastomeric energizer element |
| JP2008039080A (en) * | 2006-08-07 | 2008-02-21 | Nok Corp | Sealing system |
-
2013
- 2013-03-26 JP JP2013063991A patent/JP2014190362A/en active Pending
-
2014
- 2014-03-26 CN CN201410115252.9A patent/CN104074980B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4239244A (en) * | 1978-05-26 | 1980-12-16 | Textron, Inc. | Hydraulic piston rod seal |
| JP2004251413A (en) * | 2003-02-21 | 2004-09-09 | Nok Corp | Sealing device for reciprocation spindle |
| CN1965185A (en) * | 2004-06-07 | 2007-05-16 | Nok株式会社 | Sealing system |
| CN101105226A (en) * | 2006-07-10 | 2008-01-16 | 沃尔沃建造设备控股（瑞典）有限公司 | Anticorrosion device for hydraulic cylinder in heavy construction equipment |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111473113A (en) * | 2019-01-23 | 2020-07-31 | 株式会社荒井制作所 | Sealing device |
| CN111473113B (en) * | 2019-01-23 | 2023-10-31 | 株式会社荒井制作所 | Sealing device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2014190362A (en) | 2014-10-06 |
| CN104074980B (en) | 2016-05-11 |
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| C14 | Grant of patent or utility model | ||
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Address after: Tokyo, Japan, Japan Patentee after: Company Walka Address before: Tokyo, Japan, Japan Patentee before: Nippon Valqua Industries, Ltd. |