WO2012143991A1 - シーリングシステム - Google Patents
シーリングシステム Download PDFInfo
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- WO2012143991A1 WO2012143991A1 PCT/JP2011/059526 JP2011059526W WO2012143991A1 WO 2012143991 A1 WO2012143991 A1 WO 2012143991A1 JP 2011059526 W JP2011059526 W JP 2011059526W WO 2012143991 A1 WO2012143991 A1 WO 2012143991A1
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- WIPO (PCT)
- Prior art keywords
- seal
- dust
- dust seal
- lip
- shaft
- Prior art date
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Classifications
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- 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
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
- F16J15/3232—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1457—Piston rods
- F15B15/1461—Piston rod sealings
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- 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
- F16J15/002—Sealings comprising at least two sealings in succession
Definitions
- the present invention relates to a sealing system including a dust seal.
- a sealing system composed of a plurality of seals is used to seal an annular gap between a cylinder (housing) and a piston (shaft).
- a sealing system includes a main seal that prevents leakage of a fluid to be sealed such as oil, and a dust seal that prevents dust from entering the sealed area.
- a dust seal that prevents dust from entering the sealed area.
- only one dust seal made of urethane rubber is disposed on the atmosphere side.
- FIG. 11 is a schematic cross-sectional view showing a usage state of a sealing system according to a conventional example.
- FIG. 12 is a plan view schematically showing a second dust seal in the sealing system according to the conventional example.
- the sealing system according to the illustrated conventional example is used to seal an annular gap between the inner peripheral surface of a shaft hole provided in the housing 500 and the outer peripheral surface of the shaft 300 inserted through the shaft hole.
- the sealing system according to this conventional example includes a main seal 600 that prevents the fluid to be sealed from leaking to the atmosphere side (A) and a dust seal 700 that prevents dust from entering the fluid to be sealed side (O).
- the dust seal 700 includes a first dust seal 710 provided on the main seal 600 side and a second dust seal 720 provided on the atmosphere side (A) with respect to the first dust seal 710.
- the housing 500 includes a housing main body 510 and a fastened member 520 configured to be fastened and unfastened with bolts or the like with respect to the housing main body 510.
- An annular groove 511 is provided on the inner peripheral surface of the shaft hole of the housing body 510.
- a main seal 600 is mounted in the annular groove 511.
- the main seal 600 includes a U-shaped packing 610 having a U-shaped cross section, and a backup ring 620 for protecting the inner peripheral edge on the atmosphere side (A) in the U-shaped packing 610. Composed.
- annular recess 512 that forms a step is provided at the opening end on the atmosphere side (A) of the shaft hole of the housing main body 510.
- a first dust seal 710 is mounted in the annular recess 512.
- the first dust seal 710 includes a metal ring 711 and a seal body 712 provided integrally with the metal ring 711. The first dust seal 710 is fixed in a state of being positioned in the axial direction when the fastened member 520 is fastened.
- annular recess 521 that forms a step is provided at the opening end of the shaft hole of the fastened member 520 on the atmosphere side (A).
- a second dust seal 720 is mounted in the annular recess 521. Similar to the first dust seal 710, the second dust seal 720 includes a metal ring 721 and a seal main body 722 provided integrally with the metal ring 721. The second dust seal 720 is fixed in a state where the second dust seal 720 is positioned in the axial direction by fitting a retaining ring 530 into an annular groove provided on the inner peripheral surface of the shaft hole of the fastened member 520.
- the first dust seal 710 there is no portion cut in the circumferential direction as in the general dust seal. Therefore, at the time of assembly, it is necessary to fit the first dust seal 710 from the end side of the shaft 300 or insert the shaft 300 into the first dust seal 710.
- the second dust seal 720 is exposed to the atmosphere, when it is used in a very harsh environment, the deterioration is severe. For example, muddy water or the like adheres to the seal body 722, or muddy water or the like adhering to the seal body 722 freezes. In this state, the seal body 722 and the shaft 300 slide, Wear of the seal lip of the main body 722 is promoted.
- the second dust seal 720 is configured to be easily replaceable. More specifically, the second dust seal 720 is divided into two parts. That is, as shown in FIG. 12, when viewed from the upper surface side, a circular object is cut into two parts, which are constituted by two semicircular members. Thereby, each divided member can be attached and detached from the outer peripheral side of the shaft 300. Therefore, the fastened member 520 is removed from the housing body, the deteriorated member is removed, and the fastened member 520 is fastened again with a new one attached. The second dust seal 720 can be easily replaced simply by doing so.
- the second dust seal 720 is first manufactured in a circular shape when viewed from the upper surface side, and then divided into two parts by cutting. And since the 2nd dust seal 720 is provided with the metal ring 721, in order to cut
- Dust that has entered from the second dust seal is prevented from entering the main seal side by the first dust seal.
- dust accumulates in the sealed area between the first dust seal and the second dust seal. Since the dust accumulated in the sealed region is sealed by the first dust seal and the second dust seal, it cannot escape from the sealed region. Therefore, when the accumulation amount exceeds a predetermined amount, a load (pressure due to accumulated dust) is applied to the first dust seal and the second dust seal. And there exists a possibility that a 1st dust seal and a 2nd dust seal may be damaged by this load.
- Dust accumulation is more likely to occur in the case of fine dust (dust having a particle size of 10 ⁇ m or less) such as dust, rather than frozen material or mud.
- fine dust dust having a particle size of 10 ⁇ m or less
- Such fine dust penetrates not only from the cut portion but also from the tip side of the lip when the second dust seal is made of a relatively hard material such as urethane rubber.
- Patent Documents 2 to 5 Other related techniques are disclosed in Patent Documents 2 to 5.
- JP 2008-223900 A Japanese Utility Model Publication No. 5-14050 JP 2001-355739 A Japanese Utility Model Publication No.59-22360 Japanese Utility Model Publication No. 5-83410
- An object of the present invention is to provide a sealing system with improved durability.
- the present invention employs the following means in order to solve the above problems.
- the sealing system of the present invention is A sealing system that seals an annular gap between an inner peripheral surface of a shaft hole provided in a housing and an outer peripheral surface of a shaft that is inserted into the shaft hole and reciprocates relative to the housing. And A main seal that prevents the fluid to be sealed from leaking to the atmosphere, A dust seal disposed on the atmosphere side of the main seal to prevent dust from entering the fluid to be sealed; and With The dust seal is composed of a first dust seal and a second dust seal provided on the atmosphere side of the first dust seal, and both the first dust seal and the second dust seal are configured to be slidable on the outer peripheral surface of the shaft.
- the seal lip of the first dust seal is made of urethane rubber
- the seal lip in the second dust seal is composed of a rubber having higher flexibility than the urethane rubber and is composed only of a seal lip extending toward the atmosphere side.
- the seal lip made of urethane rubber is excellent in the function of scraping off dust adhered to the outer peripheral surface of the shaft.
- a seal lip made of rubber (for example, NBR) having higher flexibility than urethane rubber has an excellent function of suppressing the entry of fine dust.
- the second dust seal in which the seal lip is made of rubber having higher flexibility than urethane rubber is provided on the atmosphere side. Therefore, intrusion of fine dust can be suppressed by the second dust seal. Further, the dust that enters from the second dust seal and adheres to the outer peripheral surface of the shaft is scraped off by the first dust seal having a seal lip made of urethane rubber. Since the seal lip in the second dust seal is composed only of the seal lip extending toward the atmosphere side, the dust scraped off by the first dust seal is discharged from the tip end side of the seal lip in the second dust seal to the atmosphere side. Is done. Therefore, it is possible to suppress dust from accumulating in a sealed region between the first dust seal and the second dust seal and applying a load to these dust seals.
- the tip of the seal lip in the second dust seal is preferably constituted by an edge, and the edge protrudes to the atmosphere side when in contact with the surface of the shaft.
- FIG. 1 is a schematic cross-sectional view of a sealing system according to an embodiment of the present invention.
- FIG. 2 is a schematic cross-sectional view of the first dust seal and the second dust seal according to the first embodiment of the present invention.
- FIG. 3 is a schematic cross-sectional view of the first dust seal and the second dust seal according to the second embodiment of the present invention.
- FIG. 4 is a schematic cross-sectional view of the first dust seal and the second dust seal according to the third embodiment of the present invention.
- FIG. 5 is a schematic cross-sectional view of a first dust seal and a second dust seal according to Embodiment 4 of the present invention.
- FIG. 6 is a schematic cross-sectional view of the first dust seal and the second dust seal according to the fifth embodiment of the present invention.
- FIG. 1 is a schematic cross-sectional view of a sealing system according to an embodiment of the present invention.
- FIG. 2 is a schematic cross-sectional view of the first dust seal and the second dust seal according to
- FIG. 7 is a schematic cross-sectional view of the first dust seal and the second dust seal according to the sixth embodiment of the present invention.
- FIG. 8 is a diagram illustrating a mechanism through which dust enters when the lip tip is formed of a curved surface (R surface).
- FIG. 9 is a schematic cross-sectional view of a second dust seal according to Embodiment 7 of the present invention.
- FIG. 10 is a schematic cross-sectional view of the first dust seal and the second dust seal according to Example 7 of the present invention.
- FIG. 11 is a schematic cross-sectional view showing a usage state of a sealing system according to a conventional example.
- FIG. 12 is a plan view schematically showing a second dust seal in the sealing system according to the conventional example.
- FIG. 1 is a schematic cross-sectional view of a sealing system according to an embodiment of the present invention.
- the sealing system according to the present embodiment is used to seal an annular gap between the inner peripheral surface of a shaft hole provided in the housing 500 and the outer peripheral surface of the shaft 300 inserted through the shaft hole.
- it is used for hydraulic cylinders for construction machines.
- the cylinder corresponds to the housing 500
- the piston corresponds to the shaft 300
- the shaft 300 reciprocates in the housing 500.
- the sealing system includes a buffer ring 400 that buffers the pressure of the fluid to be sealed (for example, oil), a main seal 600 that prevents the fluid to be sealed from leaking to the atmosphere side (A), and dust that is sealed.
- a first dust seal 100 and a second dust seal 200 are provided to prevent entry into the target fluid side (O).
- the housing 500 includes a housing main body 510 and a fastened member 520 configured to be fastened and unfastened with bolts or the like with respect to the housing main body 510.
- a first annular groove 511 and a second annular groove 514 are provided on the inner peripheral surface of the shaft hole of the housing body 510.
- the buffer ring 400 is attached to the first annular groove 511
- the main seal 600 is attached to the second annular groove 514.
- the main seal 600 is composed of a U-shaped packing 610 having a U-shaped cross section, and a backup ring 620 for protecting the edge of the U-shaped packing 610 on the atmosphere side (A).
- the U-shaped packing 610 includes a seal lip that slides with respect to the shaft 300.
- An annular recess 513 that forms a step is provided at the opening end on the atmosphere side (A) of the shaft hole of the housing main body 510.
- the first dust seal 100 is mounted in the annular recess 513.
- an annular recess 521 that forms a step is provided at the opening end on the atmosphere side (A) of the fastened member 520.
- the second dust seal 200 is mounted in the annular recess 521.
- the first dust seal 100 is provided on the main seal 600 side, and the second dust seal 200 is provided on the atmosphere side of the first dust seal 100. Moreover, the 1st dust seal 100 and the 2nd dust seal 200 are not provided with the cutting part in any location of the circumferential direction.
- dust that can be prevented from entering by the dust seal includes fine dust such as dust, icing material, mud, and iron ore grains that are easy to adhere to the surface of the shaft 300 and those that are somewhat large and hard. Is also included.
- the first dust seal 100 has a seal lip configured to be slidable on the outer peripheral surface of the shaft 300.
- the seal lip in the first dust seal 100 is made of urethane rubber.
- the second dust seal 200 has a seal lip configured to be slidable on the outer peripheral surface of the shaft 300.
- the seal lip in the second dust seal 200 is composed of rubber (for example, NBR) having higher flexibility than urethane rubber, and is composed only of a seal lip extending toward the atmosphere side.
- the seal lip made of urethane rubber has an excellent function of scraping off dust adhered to the outer peripheral surface of the shaft 300.
- a seal lip made of rubber having higher flexibility than urethane rubber has an excellent function of suppressing the entry of fine dust.
- a second dust seal 200 is provided on the atmosphere side.
- the second dust seal 200 has a seal lip made of rubber having higher flexibility than urethane rubber. Therefore, the second dust seal 200 can suppress the entry of fine dust.
- the dust that enters from the second dust seal 200 and adheres to the outer peripheral surface of the shaft is scraped off by the first dust seal 100 whose seal lip is made of urethane rubber. Since the seal lip in the second dust seal 200 is composed only of the seal lip extending toward the atmosphere side (A), the dust scraped off by the first dust seal 100 is the seal lip side in the second dust seal 200. To the atmosphere side (A). Therefore, it is possible to suppress dust from accumulating in a sealed region between the first dust seal 100 and the second dust seal 200 and applying a load to these dust seals.
- Comparative Example 1 the same first dust seal as that of the present example is used.
- the same rubber material as that of the present embodiment is used as the material of the seal lip, and in addition to the seal lip extending toward the atmosphere side (A), the seal extending toward the fluid to be sealed (O). Use one with a lip.
- Comparative Example 2 the same second dust seal as that of the present example is used.
- a seal lip made of rubber having higher flexibility than urethane rubber is employed.
- both the first dust seal and the second dust seal are provided with a seal lip made of rubber having higher flexibility than urethane rubber, it is possible to suitably prevent fine dust from entering.
- a seal lip cannot scrape off dust adhered to the outer peripheral surface of the shaft 300, so that the dust enters the main seal 600 side. Therefore, the sealing performance of the main seal 600 is impaired early.
- Comparative Example 3 the same first dust seal as that of the present example is used.
- a seal lip made of urethane rubber is employed.
- both the first dust seal and the second dust seal are provided with a seal lip made of urethane rubber, the dust adhering to the outer peripheral surface of the shaft 300 can be suitably scraped off.
- these seal lips cannot suppress the entry of fine dust. Accordingly, since fine dust is interposed between the seal lip tip of each seal and the outer peripheral surface of the shaft 300, each seal lip wears out early.
- Comparative Example 4 a seal lip made of rubber having higher flexibility than urethane rubber is used as the first dust seal. As the second dust seal, a seal lip made of urethane rubber is employed.
- FIG. 2 is a schematic cross-sectional view of the first dust seal and the second dust seal according to the first embodiment of the present invention.
- the first dust seal 100 includes a metal ring 110 having an L-shaped cross section and a seal body 120 provided integrally with the metal ring 110.
- the seal body 120 is made of urethane rubber, and includes a first seal lip 121 extending to the fluid to be sealed side (O) and a second seal lip 122 extending to the atmosphere side (A). Both the first seal lip 121 and the second seal lip 122 slide with respect to the shaft 300.
- 1st seal lip 121 exhibits the function which controls that the fluid for sealing leaked from main seal 600 leaks to the atmosphere side (A).
- the second seal lip 122 exhibits a function of scraping off dust adhered to the outer peripheral surface of the shaft 300.
- the second dust seal 200 includes a metal ring 210 having an L-shaped cross section and a seal body 220 provided integrally with the metal ring 210.
- the seal body 220 is made of rubber (for example, NBR) having higher flexibility than urethane rubber, and includes a seal lip 221 that extends to the atmosphere side (A).
- the 2nd dust seal 200 exhibits the function which suppresses the penetration
- the dust accumulated in the sealed region between the first dust seal 100 and the second dust seal 200 is discharged from the front end side of the seal lip 221 to the atmosphere side (A). Therefore, it is possible to suppress the load of dust accumulated in the sealed region from being applied to the first dust seal 100 and the second dust seal 200.
- FIG. 3 is a schematic cross-sectional view of the first dust seal and the second dust seal according to the second embodiment of the present invention.
- the first dust seal 100 has the same configuration as that of the first dust seal in the first embodiment.
- two second dust seals 200 are provided side by side.
- the configuration of each second dust seal 200 is the same as that of the second dust seal 200 in the first embodiment.
- the dust seal according to the present embodiment it is possible to further suppress the intrusion of fine dust compared to the case of the first embodiment.
- FIG. 4 is a schematic cross-sectional view of the first dust seal and the second dust seal according to the third embodiment of the present invention.
- the second dust seal 200 has the same configuration as that of the second dust seal in the first embodiment.
- the first dust seal 100a configured differently from the first dust seal 100a having the same configuration as that of the first dust seal 100 in the first embodiment is arranged side by side. .
- the first dust seal 100a includes a metal ring 110a having an L-shaped cross section and a seal body 120a provided integrally with the metal ring 110a.
- the seal body 120a is also made of urethane rubber, and includes a seal lip 122a extending to the atmosphere side (A).
- the first dust seal 100a is different from the first dust seal 100 in that it does not include a seal lip extending to the fluid to be sealed (O).
- the seal lip 122a in the first dust seal 100a also exhibits a function of scraping off dust adhered to the outer peripheral surface of the shaft 300.
- the dust adhered to the outer peripheral surface of the shaft 300 can be scraped off more than in the case of the first embodiment. Since the first dust seal 100a is not provided with a seal lip extending toward the fluid to be sealed (O), the dust scraped off by the first dust seal 100 is the tip side of the seal lip 122a of the first dust seal 100a. To the atmosphere.
- FIG. 5 is a schematic cross-sectional view of a first dust seal and a second dust seal according to Embodiment 4 of the present invention.
- the first dust seal 100 has the same configuration as that of the first dust seal in the first embodiment.
- three second dust seals 200 are provided side by side.
- the configuration of each second dust seal 200 is the same as that of the second dust seal 200 in the first embodiment.
- the dust seal according to the present embodiment it is possible to further suppress the intrusion of fine dust as compared with the case of the second embodiment.
- FIG. 6 is a schematic cross-sectional view of the first dust seal and the second dust seal according to the fifth embodiment of the present invention.
- the first dust seal has the same configuration as that of the third embodiment. That is, the first dust seal 100 including the first seal lip 121 and the second seal lip 122 and the first dust seal 100a including only the seal lip 122a extending to the atmosphere side (A) are arranged side by side.
- the dust seal according to the present embodiment it is possible to further suppress the intrusion of fine dust and to scrape off the dust adhered to the outer peripheral surface of the shaft 300 as compared with the case of the first embodiment.
- FIG. 7 is a schematic cross-sectional view of the first dust seal and the second dust seal according to the sixth embodiment of the present invention.
- the second dust seal 200 according to the present embodiment has the same configuration as that of the second dust seal in the first embodiment.
- adopts what has only the seal lip 122a extended to the atmosphere side (A) shown in the said Examples 3 and 5.
- adopts what has only the seal lip 122a extended to the atmosphere side (A) shown in the said Examples 3 and 5.
- the fluid to be sealed that has leaked from the main seal 600 does not have a function of suppressing leakage to the atmosphere side (A), and the case of the above-described first embodiment. Similar effects can be obtained.
- Example 7 A second dust seal according to Embodiment 7 of the present invention will be described with reference to FIGS.
- the seal lip 221 is made of rubber having higher flexibility than urethane rubber, thereby exhibiting a function of suppressing the entry of fine dust.
- the lip tip 221R of the seal lip 221 is configured with a curved surface (R surface)
- the function of suppressing the entry of fine dust may not be sufficiently exhibited. This point will be described with reference to FIG.
- the lip tip 221R of the seal lip 221 is a curved surface, a gap exists between the surface of the shaft 300 and the lip tip 221R as shown in FIG.
- FIG. 9 is a schematic cross-sectional view of the second dust seal 200a according to the present embodiment.
- 2A is a schematic sectional view of the second dust seal 200a alone
- FIG. 2B is a schematic sectional view showing a state in which the seal lip is in contact (sliding) with the shaft 300.
- FIG. 9 is a schematic cross-sectional view of the second dust seal 200a according to the present embodiment.
- 2A is a schematic sectional view of the second dust seal 200a alone
- FIG. 2B is a schematic sectional view showing a state in which the seal lip is in contact (sliding) with the shaft 300.
- the metal ring 210 having an L-shaped cross section and the seal body 220a provided integrally with the metal ring 210 are used. Composed.
- the seal body 220a is made of rubber (for example, NBR) having higher flexibility than urethane rubber, and includes a seal lip 221a extending to the atmosphere side (A).
- the lip tip of the seal lip 221a is constituted by the edge E. That is, the lip tip of the seal lip 221a is configured to have a sharp angle rather than a curved surface (R surface) (see FIG. 9A).
- the edge E protrudes to the atmosphere side (A) as shown in a circle C in FIG. 9B. It is configured.
- the lip tip of the seal lip 221a is in close contact with the surface roughness (small irregularities) of the shaft 300.
- the occurrence of the phenomenon shown in FIG. 8 described above can be suppressed, and the intrusion of dust X can be further suppressed.
- the intrusion amount of the dust X can be reduced by about 1/3 compared to the curved surface (R surface).
- the second dust seal 200a according to the present embodiment is applicable to any of the first to sixth embodiments described above.
- FIG. 10 shows a case where the second dust seal 200a according to the present embodiment is applied to the fifth embodiment.
- the first dust seal 100 is mounted in the annular recess 513 provided in the housing body 510
- the second dust seal 200 is mounted in the annular recess 521 provided in the fastened member 520.
- first dust seals 100 and the second dust seals 200 are used, it is not always necessary to attach all the first dust seals 100 to the annular recess 513, and all the second dust seals 200 are not necessarily attached to the annular recess 521. There is no need to wear it. That is, if the first dust seal 100 arranged closest to the fluid to be sealed (O) is attached to the annular recess 513 and the second dust seal 200 arranged closest to the atmosphere side (A) is attached to the annular recess 521, the other The dust seal may be attached to either.
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Abstract
Description
ハウジングに設けられた軸孔の内周面と、該軸孔に挿通され、かつ該ハウジングに対して相対的に往復移動する軸の外周面との間の環状隙間を封止するシーリングシステムであって、
密封対象流体が大気側に漏れるのを防ぐメインシールと、
該メインシールよりも大気側に配置されて、ダストが密封対象流体側に侵入するのを防ぐダストシールと、
を備え、
ダストシールが、第1ダストシールと、この第1ダストシールよりも大気側に設けられる第2ダストシールとから構成され、これら第1ダストシール及び第2ダストシールは、いずれも前記軸の外周面に摺動自在に構成されたシールリップを有するシーリングシステムにおいて、
第1ダストシールのシールリップはウレタンゴムから構成されており、
第2ダストシールにおけるシールリップは、前記ウレタンゴムよりも柔軟性の高いゴムから構成され、かつ大気側に向かって伸びるシールリップのみから構成されていることを特徴とする。
図1を参照して、本発明の実施形態に係るシーリングシステムについて説明する。図1は本発明の実施形態に係るシーリングシステムの模式的断面図である。
本実施形態に係るシーリングシステムは、ハウジング500に設けられた軸孔の内周面と、該軸孔に挿通される軸300の外周面との間の環状隙間を封止するために用いられる。より具体的な例としては、建設機械用の油圧シリンダなどに用いられる。油圧シリンダの場合には、シリンダがハウジング500に相当し、ピストンが軸300に相当し、ハウジング500内において、軸300が往復移動する。
第1ダストシール100は、メインシール600側に設けられ、第2ダストシール200は、この第1ダストシール100よりも大気側に設けられる。また、第1ダストシール100及び第2ダストシール200は、周方向のいずれの箇所にも切断部は設けられていない。
本実施形態に係るシールシステムにおいては、大気側に、シールリップがウレタンゴムよりも柔軟性の高いゴムから構成された第2ダストシール200が設けられている。従って、この第2ダストシール200によって、微細なダストの侵入を抑制することができる。
以下、シールリップの構成や材料を変更した場合の比較例について説明する。
比較例1では、第1ダストシールとして、本実施例と同じものを採用する。そして、第2ダストシールとして、シールリップの材料は本実施例と同じゴム材料を用い、かつ大気側(A)に向かって伸びるシールリップの他に、密封対象流体側(O)に向かって伸びるシールリップを有するものを採用する。
比較例2では、第2ダストシールとして、本実施例と同じものを採用する。そして、第1ダストシールとして、シールリップの材料をウレタンゴムよりも柔軟性の高いゴムとしたものを採用する。
比較例3では、第1ダストシールとして、本実施例と同じものを採用する。そして、第2ダストシールとして、シールリップの材料をウレタンゴムとしたものを採用する。
比較例4では、第1ダストシールとして、シールリップの材料をウレタンゴムよりも柔軟性の高いゴムとしたものを採用する。そして、第2ダストシールとして、シールリップの材料をウレタンゴムとしたものを採用する。
図2を参照して、本発明の実施例1に係る第1ダストシール及び第2ダストシールについて説明する。図2は本発明の実施例1に係る第1ダストシール及び第2ダストシールの模式的断面図である。
図3を参照して、本発明の実施例2に係る第1ダストシール及び第2ダストシールについて説明する。図3は本発明の実施例2に係る第1ダストシール及び第2ダストシールの模式的断面図である。
図4を参照して、本発明の実施例3に係る第1ダストシール及び第2ダストシールについて説明する。図4は本発明の実施例3に係る第1ダストシール及び第2ダストシールの模式的断面図である。
図5を参照して、本発明の実施例4に係る第1ダストシール及び第2ダストシールについて説明する。図5は本発明の実施例4に係る第1ダストシール及び第2ダストシールの模式的断面図である。
図6を参照して、本発明の実施例5に係る第1ダストシール及び第2ダストシールについて説明する。図6は本発明の実施例5に係る第1ダストシール及び第2ダストシールの模式的断面図である。
図7を参照して、本発明の実施例6に係る第1ダストシール及び第2ダストシールについて説明する。図7は本発明の実施例6に係る第1ダストシール及び第2ダストシールの模式的断面図である。
図8~図10を参照して、本発明の実施例7に係る第2ダストシールについて説明する。上記の通り、第2ダストシールにおいて、シールリップ221をウレタンゴムよりも柔軟性の高いゴムにより構成することで、微細なダストの侵入を抑制する機能を発揮する。しかしながら、シールリップ221のリップ先端221Rを湾曲面(R面)で構成した場合には、微細なダストの侵入を抑制する機能が十分に発揮しない場合がある。この点について、図8を参照して説明する。シールリップ221のリップ先端221Rが湾曲面の場合、図8(a)に示すように、軸300の表面とリップ先端221Rとの間には隙間が存在する。そのため、この隙間に微細なダストXが入り込んだ状態で、軸300が相対的に密封対象流体側(O)に移動した場合(図8(b)中矢印参照)、ダストXが密封対象流体側(O)に侵入してしまうことがある。そこで、本実施例においては、ダストXの侵入をより一層抑制するための構成を示す。
上記実施形態では、ハウジング本体510に設けられた環状凹部513に第1ダストシール100が装着され、被締結部材520に設けられた環状凹部521に第2ダストシール200が装着される構成を示した。
110,110a 金属環
120,120a シール本体
121 第1シールリップ
122 第2シールリップ
122a シールリップ
200,200a 第2ダストシール
210 金属環
220,220a シール本体
221,221a シールリップ
300 軸
400 バッファリング
500 ハウジング
510 ハウジング本体
511 第1環状溝
513 環状凹部
514 第2環状溝
520 被締結部材
521 環状凹部
600 メインシール
E エッジ
Claims (2)
- ハウジングに設けられた軸孔の内周面と、該軸孔に挿通され、かつ該ハウジングに対して相対的に往復移動する軸の外周面との間の環状隙間を封止するシーリングシステムであって、
密封対象流体が大気側に漏れるのを防ぐメインシールと、
該メインシールよりも大気側に配置されて、ダストが密封対象流体側に侵入するのを防ぐダストシールと、
を備え、
ダストシールが、第1ダストシールと、この第1ダストシールよりも大気側に設けられる第2ダストシールとから構成され、これら第1ダストシール及び第2ダストシールは、いずれも前記軸の外周面に摺動自在に構成されたシールリップを有するシーリングシステムにおいて、
第1ダストシールのシールリップはウレタンゴムから構成されており、
第2ダストシールにおけるシールリップは、前記ウレタンゴムよりも柔軟性の高いゴムから構成され、かつ大気側に向かって伸びるシールリップのみから構成されていることを特徴とするシーリングシステム。 - 第2ダストシールにおけるシールリップの先端はエッジによって構成され、かつ前記軸の表面に接触した状態では該エッジが大気側に突き出た状態となるように構成されていることを特徴とする請求項1に記載のシーリングシステム。
Priority Applications (5)
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JP2012528185A JPWO2012143991A1 (ja) | 2011-04-18 | 2011-04-18 | シーリングシステム |
PCT/JP2011/059526 WO2012143991A1 (ja) | 2011-04-18 | 2011-04-18 | シーリングシステム |
CN201180009616XA CN102971557A (zh) | 2011-04-18 | 2011-04-18 | 密封系统 |
AU2011341379A AU2011341379A1 (en) | 2011-04-18 | 2011-04-18 | Sealing system |
US13/520,648 US20120326396A1 (en) | 2011-04-18 | 2011-04-18 | Sealing system |
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PCT/JP2011/059526 WO2012143991A1 (ja) | 2011-04-18 | 2011-04-18 | シーリングシステム |
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JP (1) | JPWO2012143991A1 (ja) |
CN (1) | CN102971557A (ja) |
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US8657296B1 (en) | 2011-10-26 | 2014-02-25 | Engineered Seal Products, Inc. | Radial shaft seal |
DE102013215973A1 (de) * | 2013-08-13 | 2015-03-12 | Aktiebolaget Skf | Dichtring |
DE102015105737A1 (de) * | 2015-04-15 | 2016-10-20 | Carl Freudenberg Kg | Abstreifer |
EP3289274A4 (en) * | 2015-04-29 | 2018-10-31 | Graco Minnesota Inc. | Seals separated by retaining clip |
NL2020508B1 (en) * | 2018-02-28 | 2019-09-16 | Vialle Group B V | FUEL SUPPLY SYSTEM AND ASSEMBLY FOR INJECTING LlQUEFIED VAPOUR UNDER HIGH PRESSURE INTO A COMBUSTION CHAMBER |
US11041511B2 (en) * | 2018-04-05 | 2021-06-22 | Caterpillar Global Mining Llc | Hydraulic cylinder service life improvement |
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JPH1194092A (ja) * | 1997-09-19 | 1999-04-09 | Nippon Valqua Ind Ltd | シリンダ用シール材 |
JP2003049806A (ja) * | 2001-08-08 | 2003-02-21 | Kayaba Ind Co Ltd | 単動シリンダ |
JP2005240833A (ja) * | 2004-02-24 | 2005-09-08 | Nok Corp | 密封装置 |
JP2007278459A (ja) * | 2006-04-11 | 2007-10-25 | Nok Corp | オイルシール |
JP2009174555A (ja) * | 2008-01-21 | 2009-08-06 | Komatsu Ltd | ダストシールシステム |
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US5782142A (en) * | 1996-04-12 | 1998-07-21 | Tuff Torq Corporation | Axle driving apparatus |
CN2506820Y (zh) * | 2001-08-23 | 2002-08-21 | 三一重工股份有限公司 | 液压油缸活塞杆的防水装置 |
CN100578047C (zh) * | 2004-06-07 | 2010-01-06 | Nok株式会社 | 密封系统 |
CN201103689Y (zh) * | 2007-09-30 | 2008-08-20 | 青岛海力威密封有限公司 | 高压防尘圈 |
JP5423409B2 (ja) * | 2010-01-12 | 2014-02-19 | Nok株式会社 | シーリングシステム |
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2011
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- 2011-04-18 WO PCT/JP2011/059526 patent/WO2012143991A1/ja active Application Filing
- 2011-04-18 JP JP2012528185A patent/JPWO2012143991A1/ja active Pending
- 2011-04-18 CN CN201180009616XA patent/CN102971557A/zh active Pending
- 2011-04-18 US US13/520,648 patent/US20120326396A1/en not_active Abandoned
Patent Citations (5)
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JPH1194092A (ja) * | 1997-09-19 | 1999-04-09 | Nippon Valqua Ind Ltd | シリンダ用シール材 |
JP2003049806A (ja) * | 2001-08-08 | 2003-02-21 | Kayaba Ind Co Ltd | 単動シリンダ |
JP2005240833A (ja) * | 2004-02-24 | 2005-09-08 | Nok Corp | 密封装置 |
JP2007278459A (ja) * | 2006-04-11 | 2007-10-25 | Nok Corp | オイルシール |
JP2009174555A (ja) * | 2008-01-21 | 2009-08-06 | Komatsu Ltd | ダストシールシステム |
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CN102971557A (zh) | 2013-03-13 |
JPWO2012143991A1 (ja) | 2014-07-28 |
US20120326396A1 (en) | 2012-12-27 |
AU2011341379A1 (en) | 2012-11-01 |
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