WO2014027426A1 - フローティングシール - Google Patents
フローティングシール Download PDFInfo
- Publication number
- WO2014027426A1 WO2014027426A1 PCT/JP2012/074903 JP2012074903W WO2014027426A1 WO 2014027426 A1 WO2014027426 A1 WO 2014027426A1 JP 2012074903 W JP2012074903 W JP 2012074903W WO 2014027426 A1 WO2014027426 A1 WO 2014027426A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- floating seal
- content
- floating
- seal
- sliding surface
- Prior art date
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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
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3496—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member use of special materials
-
- 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
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3436—Pressing means
- F16J15/344—Pressing means the pressing force being applied by means of an elastic ring supporting the slip-ring
Definitions
- the present invention relates to a floating seal.
- crawler-type work machines such as hydraulic excavators and bulldozers are provided with rotating wheels such as driving wheels, idle wheels, and vertical rolling wheels.
- the rotating wheel is provided with a seal structure for the purpose of suppressing leakage of the lubricating oil for the bearing and preventing intrusion of moisture and earth and sand.
- the seal structure is usually composed of a pair of floating seals and a pair of elastic rings provided between the stationary housing and the rotating housing.
- the pair of floating seals are formed in an annular shape and are slidably in contact with each other on the same axis.
- Each floating seal is supported by each housing via each elastic ring that is in contact with the outer periphery of each floating seal (see, for example, Patent Document 1).
- Such a floating seal is manufactured by a centrifugal casting method, a sand mold casting method, or the like (see, for example, Patent Documents 2 to 4).
- This floating seal is required to have high strength as well as wear resistance and seizure resistance. As a technique for increasing the strength, it is conceivable to increase the thickness of the floating seal, but the cost increases.
- the strength of the floating seal can be improved by reducing the amount of carbide by changing the amount of components, such as reducing the amount of carbon.
- the amount of carbon decreases, problems with manufacturing efficiency such as poor hot water flow and an increased manufacturing failure rate arise.
- wear resistance and seizure resistance may be reduced.
- An object of the present invention is to provide a floating seal capable of improving strength, heat resistance and wear resistance while suppressing a decrease in production efficiency.
- the floating seal according to the first aspect of the present invention is a floating seal composed of C, Si, Mn, Ni, Cr, Mo, V, B, and the balance of Fe and inevitable impurities.
- the contents of C, Si, Mn, Ni, Cr, Mo, V, and B are as follows: C: 2.2 to 3.9 wt%, Si: 0.5 to 3.5 wt%, Mn: 0.1 to 2 0.0 wt%, Ni: 0.5 to 4.3 wt%, Cr: 7.5 to 25.0 wt%, Mo: 0 to 8.0 wt% (excluding 0), V: 0 to 6.0 wt% % (Excluding 0), B: 0.02 to 0.4 wt%.
- the content of Cr in the matrix phase is 2.00 to 5.41 wt%.
- the graphite content is 0.05 to 0.35 area%.
- the content of the carbonized boride is 19 to 40 area%.
- the floating seal according to the second aspect of the present invention is the floating seal according to the first aspect, and the content of Cr in the parent phase is 2.00 to 3.50 wt%.
- the graphite content is 0.05 to 0.30 area%.
- the content of the carbonized boride is 25 to 35 area%.
- the relationship among the Cr content, the graphite content, and the carbide content in the matrix is adjusted.
- B is added to the floating seal
- graphite is likely to precipitate.
- the precipitation amount of carbide is reduced.
- the strength of the floating seal is improved.
- carbonized_material can be reduced, without reducing the amount of carbon, a hot water flow property can be maintained. Thereby, the fall of manufacturing efficiency is suppressed.
- the wear resistance is improved by the precipitated graphite.
- the familiarity resistance is also improved by the precipitated graphite.
- Sectional drawing of a seal structure The perspective view of a floating seal.
- the surface photograph of the sample which shows the measuring method of area% of carbon boride.
- a photograph of the surface of a sample showing a method of measuring area% of graphite.
- the schematic diagram which shows the structure of a seal tester.
- FIG. 1 is a cross-sectional view of a seal structure.
- This seal structure is provided, for example, in a final reduction device provided in a crawler work machine such as a hydraulic excavator or a bulldozer.
- the seal structure is provided between the stationary member 11 and the rotating member 12.
- the rotation side member 12 is attached to the fixed side member 11 via a bearing 13.
- the rotation side member 12 is provided to be rotatable with respect to the fixed side member 11.
- the seal structure seals the internal space N filled with the lubricating oil for the bearing 13.
- the seal structure suppresses leakage of the lubricating oil from the internal space N. Further, the seal structure suppresses intrusion of moisture and earth and sand from the gap R between the fixed side member 11 and the rotation side member 12 into the internal space N.
- the seal structure includes a first floating seal 14, a second floating seal 15, a first elastic ring 16, and a second elastic ring 17.
- the first floating seal 14 and the second floating seal 15 are floating seals described later.
- the first elastic ring 16 and the second elastic ring 17 are made of a rubber member such as nitrile rubber or silicone rubber, for example.
- FIG. 2 is a perspective view of the first floating seal 14.
- the first floating seal 14 has an annular shape having a through hole 141. As shown in FIG. 1, a part of the fixed side member 11 is inserted into the through hole 141 of the first floating seal 14. However, the inner surface of the first floating seal 14 is disposed away from the stationary member 11 and does not contact the stationary member. The first floating seal 14 is elastically supported by the rotation side member 12 via the first elastic ring 16.
- the second floating seal 15 has an annular shape having a through hole 151.
- the second floating seal 15 is disposed concentrically with the central axis of the first floating seal 14.
- the second floating seal 15 is disposed symmetrically with the first floating seal 14 with respect to a plane perpendicular to the central axis.
- the second floating seal 15 is elastically supported by the stationary member 11 via the second elastic ring 17.
- the first floating seal 14 and the second floating seal 15 are arranged so as to face each other. The first floating seal 14 slides with respect to the second floating seal 15 by rotating together with the rotation side member 12.
- the first floating seal 14 has a first tip surface 142, a first bottom surface 143, and a first side surface 144.
- the second floating seal 15 has a second tip surface 152, a second bottom surface 153, and a second side surface 154.
- the first tip surface 142 is located on the opposite side of the first bottom surface 143.
- the second tip surface 152 is located on the opposite side of the second bottom surface 153.
- the first bottom surface 143 and the second bottom surface 153 are arranged to face each other.
- the first bottom surface 143 has a first sliding surface 145 and a first tapered surface 146.
- the second bottom surface 153 has a second sliding surface 155 and a second tapered surface 156.
- the first sliding surface 145 is located outside the first tapered surface 146 in the radial direction on the first bottom surface 143.
- the second sliding surface 155 is positioned outside the second tapered surface 156 in the radial direction on the second bottom surface 153.
- the first sliding surface 145 and the second sliding surface 155 are in contact with each other.
- the first taper surface 146 and the second taper surface 156 are inclined so that the distance between each other increases inward in the radial direction.
- the first side surface 144 is in contact with the first elastic ring 16.
- the first side surface 144 has a concave shape.
- the first elastic ring 16 is held by the concave shape of the first side surface 144.
- the first side surface 144 is inclined so that the outer diameter decreases from the first bottom surface 143 side toward the first tip surface 142 side.
- the rotation side member 12 has the 1st contact surface 121 with which the 1st elastic ring 16 contacts.
- the first contact surface 121 is inclined in the same direction as the first side surface 144.
- the second side surface 154 is in contact with the second elastic ring 17.
- the second side surface 154 has a concave shape.
- the second elastic ring 17 is held by the concave shape of the second side surface 154.
- the second side surface 154 is inclined so that the outer diameter decreases from the second bottom surface 153 side toward the second tip surface 152 side.
- the fixed member 11 has a second contact surface 111 with which the second elastic ring 17 contacts.
- the second contact surface 111 is inclined in the same direction as the second side surface 154.
- Rotation of the first floating seal 14 together with the rotary member 12 causes the first sliding surface 145 to slide relative to the second sliding surface 155.
- the first sliding surface 145 and the second sliding surface 155 are pressed against each other by the elastic force of the first elastic ring 16 and the second elastic ring 17.
- the space between the first sliding surface 145 and the second sliding surface 155 is sealed both when the rotation-side member 12 is rotated and when it is stopped.
- the floating seal according to the present embodiment is a floating seal composed of C, Si, Mn, Ni, Cr, Mo, V, B, and the balance of Fe and inevitable impurities.
- the contents of C, Si, Mn, Ni, Cr, Mo, V, and B are as follows: C: 2.2 to 3.9 wt%, Si: 0.5 to 3.5 wt%, Mn: 0.1 to 2.
- the content of Cr in the matrix is 2.00 to 5.41 wt%.
- the graphite content is 0.05 to 0.35 area%.
- the content of the carbonized boride is 19 to 40 area%. More preferably, the Cr content in the matrix is 2.00 to 3.50 wt%, the graphite content is 0.05 to 0.30 area%, and the carbon boride content is 25 ⁇ 35 area%.
- C forms carbides.
- C is necessary for converting the parent phase into martensite.
- the effect is insufficient.
- toughness will fall. Therefore, the C content is 2.2 to 3.9% by weight.
- Si simplifies deoxidation and improves hot water flow. However, if the Si content is small, the effect is small. Moreover, when there is much content of Si, toughness will fall. Therefore, the Si content is 0.5 to 3.5% by weight.
- Mn is an element necessary for deoxidation and desulfurization. If the Mn content is low, the effect is insufficient. Moreover, when there is much content of Mn, toughness will fall. Therefore, the Mn content is 0.1 to 2.0% by weight.
- Ni enhances hardenability and promotes martensite formation. However, if the Ni content is small, the effect is small. Moreover, when there is much content of Ni, austenite will be stabilized too much and a retained austenite will be formed in large quantities. Therefore, the Ni content is 0.5 to 4.3% by weight.
- Cr forms carbides and improves the hardenability of the parent phase.
- the wear resistance is lowered due to the decrease in the content of carbide.
- abnormal wear will be accelerated
- Mo forms carbides and strengthens the mother phase by dissolving in the mother phase.
- the Mo content is 0 to 8% by weight.
- V forms carbides and improves wear resistance.
- the toughness decreases. Therefore, the V content is 0 to 6% by weight.
- ⁇ Cr in the parent phase improves heat resistance.
- Graphite improves wear resistance and familiarity.
- the carbonized boride improves wear resistance and seizure resistance. These contents are related to each other and are adjusted by the B content. Therefore, the Cr content in the matrix is 2 to 5.41% by weight.
- the amount of graphite is 0.05 to 0.35 area%.
- the content of the carbonized boride is 19 to 40 area%.
- Table 1 shows the components, hardness, and crushing strength of the examples of the present invention.
- Table 2 shows the components of the comparative example, hardness, and crushing strength.
- the amount of Cr in the matrix is wt%, and the amount of graphite and the amount of carboboride are area ratios.
- the method for measuring the area percentage of carbonized boride is as follows.
- the samples of each Example and Comparative Example were polished with an alumina grindstone 1 ⁇ m and then corroded with a nital corrosive solution to raise carbides.
- a surface photograph of Example 13 with carbides raised is shown in FIG. In FIG. 3, the lighter portion than the other portions is carbide. From the surface photograph thus obtained, only carbides were identified by image processing, and the area ratio occupied by the whole was determined as area% of the carbon boride.
- the measuring method of graphite area% is as follows. Samples of Examples and Comparative Examples were polished with an alumina grindstone 1 ⁇ m and then observed with a microscope. As an example, a photomicrograph of Example 2 is shown in FIG. From the micrograph thus obtained, the area ratio of the black portion (graphite) in the whole was determined as the area percentage of graphite.
- FIG. 5 is a diagram showing a method for evaluating the crushing strength. As shown in FIG. 5, the floating seal 21 is disposed on the mount 23 via the O-ring 22. Then, a compressive load F was applied in the radial direction of the floating seal 21, and the load when the floating seal 21 was broken was measured.
- the sliding surface of the floating seal may be locally exposed to a high temperature of about 500 ° C. due to sliding or adhesion caused by rotation of the rotating side member. For this reason, the floating seal after use tends to be softened by tempering. Then, the change before and behind use of Example 4 and Comparative Example 4 was evaluated by the seal tester 30 shown in FIG. As shown in FIG. 6, in the seal tester 30, a pair of floating seals 31 and 32 are disposed in the muddy water. One floating seal 31 is fixed by an O-ring 33. Further, the other floating seal 32 is loaded via the O-ring 34 and a rotation R around the central axis of the floating seals 31 and 32 is given. The respective sliding surfaces are pressed against each other.
- FIG. 7 shows changes in the sliding surface before and after the test.
- the broken line shows the shape of the vicinity of the sliding surface before the test (see part A in FIG. 6).
- the solid line shows the shape near the sliding surface before the test.
- FIG. 7A shows the shape in the vicinity of the sliding surface of the floating seal according to the fourth embodiment.
- FIG. 7B shows a shape in the vicinity of the sliding surface of the floating seal according to Comparative Example 4.
- the aspect ratio is changed and displayed for easy observation. As is clear from FIG. 7, the wear amount of the sliding surface was less in Example 4 than in Comparative Example 4.
- FIG. 8A is an enlarged view of the sliding surface of the floating seal according to the fourth embodiment.
- FIG. 8B is an enlarged view of the sliding surface of the floating seal according to Comparative Example 4. From the observation of the appearance of the sliding surface after the test, it was confirmed that the floating seal according to Example 4 had less seizure and better suitability than the floating seal according to Comparative Example 4.
- Table 3 shows the change in the hardness of the sliding surface before and after the test.
- the sliding surface of the floating seal according to Comparative Example 4 was harder than the sliding surface of the floating seal according to Example 4.
- the sliding surface of the floating seal according to Example 4 was harder than the sliding surface of the floating seal according to Comparative Example 4. Therefore, it was confirmed that the floating seal according to Example 4 suppresses the softening due to the tempering of the sliding surface as compared with the floating seal according to Comparative Example 4.
- the floating seal which can improve intensity
Abstract
Description
(シール構造の構成)
まず、本発明の実施形態に係るフローティングシールが用いられるシール構造について説明する。図1は、シール構造の断面図である。このシール構造は、例えば、油圧ショベルやブルドーザなどの履帯式作業機械が備える終減速装置に設けられる。
次に、フローティングシールの組成について説明する。本実施形態に係るフローティングシールは、C、Si、Mn、Ni、Cr、Mo、V、B、および残部がFeと不可避不純物とからなるフローティングシールである。C、Si、Mn、Ni、Cr、Mo、V、Bの含有量は、C:2.2~3.9wt%、Si:0.5~3.5wt%、Mn:0.1~2.0wt%、Ni:0.5~4.3wt%、Cr:7.5~25.0wt%、Mo:0~8.0wt%(ただし、0を含まない)、V:0~6.0wt%(ただし、0を含まない)、B:0.02~0.4wt%、である。また、母相中のCrの含有量が、2.00~5.41wt%である。黒鉛の含有量が、0.05~0.35面積%である。炭硼化物の含有量が、19~40面積%である。さらに好ましくは、母相中のCrの含有量が、2.00~3.50wt%であり、黒鉛の含有量が、0.05~0.30面積%であり、炭硼化物量が、25~35面積%である。各成分の意義は次の通りである。
Claims (2)
- C、Si、Mn、Ni、Cr、Mo、V、B、および残部がFeと不可避不純物とからなるフローティングシールであって、前記C、Si、Mn、Ni、Cr、Mo、V、Bの含有量が、
C:2.2~3.9wt%、
Si:0.5~3.5wt%、
Mn:0.1~2.0wt%、
Ni:0.5~4.3wt%、
Cr:7.5~25.0wt%、
Mo:0~8.0wt%(ただし、0を含まない)、
V:0~6.0wt%(ただし、0を含まない)、
B:0.02~0.4wt%、
であり、
母相中のCrの含有量が、2.00~5.41wt%であり、
黒鉛の含有量が、0.05~0.35面積%であり、
炭硼化物の含有量が、19~40面積%である、
ことを特徴とするフローティングシール。 - 母相中のCrの含有量が、2.00~3.5wt%であり、
黒鉛の含有量が、0.05~0.30面積%であり、
炭硼化物量が、25~35面積wt%である、
ことを特徴とする請求項1に記載のフローティングシール。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014505309A JP5938465B2 (ja) | 2012-08-13 | 2012-09-27 | フローティングシール |
KR1020147011570A KR20140070646A (ko) | 2012-08-13 | 2012-09-27 | 플로팅 시일 |
US14/355,965 US9200710B2 (en) | 2012-08-13 | 2012-09-27 | Floating seal |
DE112012005163.7T DE112012005163B4 (de) | 2012-08-13 | 2012-09-27 | Gleitdichtung |
CN201280057526.2A CN103946610B (zh) | 2012-08-13 | 2012-09-27 | 浮动密封件 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012-179492 | 2012-08-13 | ||
JP2012179492 | 2012-08-13 |
Publications (1)
Publication Number | Publication Date |
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WO2014027426A1 true WO2014027426A1 (ja) | 2014-02-20 |
Family
ID=50685488
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2012/074903 WO2014027426A1 (ja) | 2012-08-13 | 2012-09-27 | フローティングシール |
Country Status (6)
Country | Link |
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US (1) | US9200710B2 (ja) |
JP (1) | JP5938465B2 (ja) |
KR (1) | KR20140070646A (ja) |
CN (1) | CN103946610B (ja) |
DE (1) | DE112012005163B4 (ja) |
WO (1) | WO2014027426A1 (ja) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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US20170159148A1 (en) * | 2015-12-08 | 2017-06-08 | Caterpillar Inc. | Seal rings comprising chromium and boron cast iron |
US10746304B2 (en) * | 2018-10-12 | 2020-08-18 | Caterpillar Inc. | Face seal assembly for machine system having metallic sealing ring with stiffness relief groove to compensate for out-of-plane sealing face |
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- 2012-09-27 CN CN201280057526.2A patent/CN103946610B/zh not_active Expired - Fee Related
- 2012-09-27 KR KR1020147011570A patent/KR20140070646A/ko not_active Application Discontinuation
- 2012-09-27 US US14/355,965 patent/US9200710B2/en not_active Expired - Fee Related
- 2012-09-27 JP JP2014505309A patent/JP5938465B2/ja not_active Expired - Fee Related
- 2012-09-27 WO PCT/JP2012/074903 patent/WO2014027426A1/ja active Application Filing
- 2012-09-27 DE DE112012005163.7T patent/DE112012005163B4/de not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
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US9200710B2 (en) | 2015-12-01 |
CN103946610A (zh) | 2014-07-23 |
DE112012005163B4 (de) | 2020-06-18 |
KR20140070646A (ko) | 2014-06-10 |
DE112012005163T5 (de) | 2014-11-13 |
JPWO2014027426A1 (ja) | 2016-07-25 |
US20140300060A1 (en) | 2014-10-09 |
JP5938465B2 (ja) | 2016-06-22 |
CN103946610B (zh) | 2016-09-21 |
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