WO2002093575A1 - Butee d'ecrasement - Google Patents
Butee d'ecrasement Download PDFInfo
- Publication number
- WO2002093575A1 WO2002093575A1 PCT/JP2002/000594 JP0200594W WO02093575A1 WO 2002093575 A1 WO2002093575 A1 WO 2002093575A1 JP 0200594 W JP0200594 W JP 0200594W WO 02093575 A1 WO02093575 A1 WO 02093575A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- thermoplastic elastomer
- polymer
- styrene
- crash stop
- stop according
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/54—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head into or out of its operative position or across tracks
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B21/00—Head arrangements not specific to the method of recording or reproducing
- G11B21/02—Driving or moving of heads
- G11B21/12—Raising and lowering; Back-spacing or forward-spacing along track; Returning to starting position otherwise than during transducing operation
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B21/00—Head arrangements not specific to the method of recording or reproducing
- G11B21/16—Supporting the heads; Supporting the sockets for plug-in heads
- G11B21/22—Supporting the heads; Supporting the sockets for plug-in heads while the head is out of operative position
Definitions
- the present invention relates to a crash stop for restricting a swing range of an actuator of a magnetic disk drive, and more particularly to a crash stop which is less displaced by a shock of a stopper arm and has excellent shock absorption at a wide range of temperatures.
- the magnetic disk drive positions a magnetic head provided at the tip of an actuator that forms a part of a high-speed head positioning mechanism, and records a magnetic signal on the magnetic disk using the head. It is a device for reproducing.
- the positioning of the magnetic head is performed by controlling the current flowing through the coil using Lorentz force generated by the voice coil motor and the coil supported by the actuator.
- the magnetic head and head gimbal assembly may collide with other members or fall off when the head positioning mechanism becomes uncontrollable due to a failure or the like and runs away, causing damage. It is equipped with a stop mechanism called a crash stop to prevent the problem.
- the inventors of the present invention have conducted intensive studies to achieve the above object, and have found that a crash stop made of a thermoplastic elastomer composition having specific temperature dependence of hardness and elastic modulus is obtained. It has been found that can achieve that purpose.
- the present invention has been completed based on such findings.
- the hardness measured by an A-type hardness tester according to JIS-K-6253 is 50 degrees or more, and the temperature dependence of the elastic modulus is 0 ° C and 60 ° C. It is a crash stop characterized by comprising a thermoplastic elastomer compound that is three times or less between them.
- the thermoplastic elastomer composition used in the present invention has a hardness (hereinafter simply referred to as hardness) of at least 50 degrees as measured by an A-type hardness tester in accordance with JIS-K-6253. It is preferably at least 70 degrees, more preferably at least 80 degrees, and the temperature dependence of the elastic modulus is 3 times or less, preferably 2.5 times or less between 0 and 60 ° C. More preferably, it should be less than 2.0 times.
- Thermoplastic elastomer blends having such physical properties include, for example, polystyrene, styrene-based polymers such as styrene-based block copolymers, and polystyrene-based polymers. At least one of an olefin polymer such as ethylene and polypropylene, a polyester polymer such as polyethylene terephthalate and polybutylene terephthalate, and a polyamide polymer such as polyamide. It can be obtained by using a blend of a thermoplastic elastomer as a polymer component.
- a copolymer composed of at least one polymer block mainly composed of a vinyl aromatic compound and at least one polymer block mainly composed of a conjugated gen compound is a polymer component.
- a thermoplastic elastomer containing a polyester-based polymer such as polybutylene terephthalate as a main component is preferably used.
- crystalline polyethylene and ethylene / butylene-styrene copolymer obtained by hydrogenating a block copolymer of polybutadiene and a bushy-gen-styrene random copolymer Block copolymer with random copolymer, block copolymer of polybutadiene and polystyrene, and block copolymer of polyisoprene and polystyrene, or polybutadiene or ethylene-butadiene random copolymer Obtained by hydrogenating a block copolymer of coalesced and polystyrene, for example, a diblock copolymer of crystalline polyethylene and polystyrene, and a triblock of styrene-ethylene-butylene-styrene.
- SEBS styrene-ethylene / propylene-styrene propylene triblock copolymer
- SEPS styrene-ethylene / propylene-styrene propylene triblock copolymer
- elastomers may be used alone or in combination of two or more.
- thermoplastic elastomer compound having the temperature dependence of the elastic modulus can not be No.
- thermoplastic elastomer composition used in the present invention needs to have a property of appropriately absorbing the impact energy of the stoma arm and a durability to withstand repeated impact, and ASTM-D6301 40 to 90%, especially 50 to 85% rebound resilience measured according to ASTM-D6301 after 2 hours at 70 ° C It is desirable that the compression set of this be 70% or less, particularly 50% or less.
- the thermoplastic elastomer composition of the present invention may optionally contain a polyphenylene ether resin for the purpose of improving the compression set and maintaining the compression set within the above range.
- a polyphenylene ether resin for the purpose of improving the compression set and maintaining the compression set within the above range.
- Known resins can be used as the polyphenylene ether resin.
- poly (2,6-dimethyl-1,4-phenylene ether) and copolymers of 2,6-dimethylphenol with 2,3,6-trimethylphenol are preferred.
- poly (2,6-dimethyl and 4-phenylene ether) is preferred.
- thermoplastic elastomer composition of the present invention includes clay, diatomaceous earth, talc, barium sulfate, calcium carbonate, magnesium carbonate, metal oxide, metal oxide, as long as it has the above-mentioned physical properties.
- Force, graphite, flaky inorganic additives such as aluminum hydroxide, various metal powders, glass powders, ceramic powders, granular or granular powders such as powder polymer.
- a powdered solid filler, other various natural or artificial short fibers and long fibers eg, glass fiber, metal fiber, various other polymer fibers, etc.
- a flame retardant an antibacterial agent, a hindered amine light stabilizer, an ultraviolet absorber, an antioxidant, a coloring agent, and the like can be used as needed.
- thermoplastic elastomer compound of the present invention is not particularly limited, and a known method can be applied.
- a thermoplastic elastomer and optionally used additive components are heated and kneaded, for example, a single-screw extruder, a twin-screw extruder, a roll, a Banbury mixer, a pravender, a kneader, a high-shear mixer. Melt-kneading using, for example, a crosslinking agent such as an organic peroxide, a crosslinking assistant, or the like, if necessary, or mixing these necessary components at the same time, followed by heating and melt-kneading. Thereby, it can be easily manufactured.
- a crosslinking agent such as an organic peroxide, a crosslinking assistant, or the like
- thermoplastic elastomer composition of the present invention it is also possible to add a crosslinking agent such as an organic peroxide, a crosslinking assistant, or the like to perform crosslinking.
- a crosslinking agent such as an organic peroxide, a crosslinking assistant, or the like to perform crosslinking.
- the resin composition of the present invention thus obtained can be molded by a known method, for example, injection molding or extrusion molding, and used as a crush stop.
- the crush stop according to the present invention has a small displacement due to the impact of the stopper arm and has excellent shock absorbing properties over a wide range of temperatures.
- Thermoplastic elastomer consisting of the polymer components (parts by weight) shown in Table 1.
- a crash stop was prepared from the blend by injection molding.
- Table 1 shows the physical properties and crush stop evaluation results of the obtained thermoplastic elastomer compound.
- the crash stop was evaluated by installing the obtained crash stop inside the magnetic disk unit and causing the head positioning mechanism to run away in an environment of 0 to 60 ° C to check for damage to the mechanism. And evaluated according to the following criteria.
- S EBS Styrene-ethylene / butylene-styrene block copolymer (Taftec, trade name, manufactured by Asahi Kasei Kogyo Co., Ltd.)
- PP Polypropylene
- PS Polystyrene (Stylon, trade name, manufactured by Asahi Kasei Corporation)
- TPU Thermoplastic polyurethane
- thermoplastic elastomer compound polyvinyl chloride (manufactured by Shin-Etsu Chemical Co., Ltd.) The physical properties of the obtained thermoplastic elastomer compound were measured by the following methods.
- Hardness A type hardness tester was used in accordance with JIS-K-625.
- Elastic modulus Measured at 0 ° C and 60 ° C in accordance with JIS-K-1 625 and temperature dependency was judged from the ratio.
- Compression set The strain after 22 hours at 70 was measured according to ASTM D-6301. Industrial applicability
- the crush stop according to the present invention has a small displacement due to the impact of the stopper arm and has excellent shock absorbing properties over a wide range of temperatures.
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Vibration Dampers (AREA)
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/477,324 US20040186258A1 (en) | 2001-05-16 | 2002-01-28 | Crush stop |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001146288A JP2002338751A (ja) | 2001-05-16 | 2001-05-16 | クラッシュストップ |
JP2001-146288 | 2001-05-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002093575A1 true WO2002093575A1 (fr) | 2002-11-21 |
Family
ID=18991965
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2002/000594 WO2002093575A1 (fr) | 2001-05-16 | 2002-01-28 | Butee d'ecrasement |
Country Status (3)
Country | Link |
---|---|
US (1) | US20040186258A1 (ja) |
JP (1) | JP2002338751A (ja) |
WO (1) | WO2002093575A1 (ja) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA2747167C (en) * | 2011-07-22 | 2018-07-24 | Hitek Urethane Global Ltd. | Electrical pedestal |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0220875U (ja) * | 1988-07-26 | 1990-02-13 | ||
JPH03252972A (ja) * | 1990-03-01 | 1991-11-12 | Fujitsu Ltd | 磁気ディスク装置のキャリッジストッパ構造 |
JPH10259221A (ja) * | 1997-03-21 | 1998-09-29 | Asahi Chem Ind Co Ltd | 熱可塑性エラストマー及びその製造方法 |
JPH11240983A (ja) * | 1997-12-25 | 1999-09-07 | Hokushin Ind Inc | 熱硬化性樹脂組成物 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4716482A (en) * | 1986-02-14 | 1987-12-29 | Hewlett-Packard Company | Head actuator limit stop assembly for a disk memory drive |
-
2001
- 2001-05-16 JP JP2001146288A patent/JP2002338751A/ja active Pending
-
2002
- 2002-01-28 WO PCT/JP2002/000594 patent/WO2002093575A1/ja active Application Filing
- 2002-01-28 US US10/477,324 patent/US20040186258A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0220875U (ja) * | 1988-07-26 | 1990-02-13 | ||
JPH03252972A (ja) * | 1990-03-01 | 1991-11-12 | Fujitsu Ltd | 磁気ディスク装置のキャリッジストッパ構造 |
JPH10259221A (ja) * | 1997-03-21 | 1998-09-29 | Asahi Chem Ind Co Ltd | 熱可塑性エラストマー及びその製造方法 |
JPH11240983A (ja) * | 1997-12-25 | 1999-09-07 | Hokushin Ind Inc | 熱硬化性樹脂組成物 |
Also Published As
Publication number | Publication date |
---|---|
JP2002338751A (ja) | 2002-11-27 |
US20040186258A1 (en) | 2004-09-23 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US8022128B2 (en) | Thermoplastic elastomer composition | |
CN107207829B (zh) | 具有低压缩形变的阻尼热塑性弹性体制品 | |
KR101293785B1 (ko) | 열가소성 고무 조성물 및 이를 이용한 성형품 | |
EP0635548B1 (en) | Thermoplastic resin composition | |
JP2007536402A (ja) | 電気的性質の向上したハロゲンフリー難燃性ポリアミド組成物 | |
WO2003027183A1 (fr) | Composition de resine et element comprenant cette composition de resine | |
CN111406094A (zh) | 聚丙烯树脂组合物 | |
US4410651A (en) | Impact resistant polyphenylene ether resin compositions | |
EP0472960B1 (en) | Thermoplastic resin composition | |
WO2002093575A1 (fr) | Butee d'ecrasement | |
JP4400902B2 (ja) | 制振性を有するポリフェニレンエーテル樹脂組成物 | |
JPH107876A (ja) | 防振ボス | |
JP3742488B2 (ja) | 制振性に優れたポリフェニレンエーテル系樹脂組成物 | |
JP4266219B2 (ja) | 制振性に優れたポリフェニレンエーテル系樹脂組成物 | |
JPH09263702A (ja) | 防振用熱可塑性材料 | |
JPH09296827A (ja) | 防振ボス | |
JP2005089700A (ja) | 柔軟性に優れる樹脂組成物 | |
JP2991871B2 (ja) | 水添ブロック共重合体エラストマー組成物 | |
JP2005047948A (ja) | スチレン系熱可塑性エラストマー組成物 | |
JP4145113B2 (ja) | 高反発弾性スチレン系熱可塑性エラストマー組成物 | |
US9522992B1 (en) | Polypropylene-based resin composition and molded article thereof | |
JPS63245453A (ja) | 耐ストレスクラツク性及び耐衝撃性良好なる樹脂組成物 | |
JPH09272784A (ja) | 車輛用内装材 | |
JP3471125B2 (ja) | ポリフェニレンスルフィド系樹脂組成物 | |
WO2021024347A1 (ja) | 熱可塑性エラストマー組成物 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE ES FI GB GD GE GH GM HR HU ID IL IN IS KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ PH PL PT RO RU SD SE SG SI SK SL TJ TM TR TT TZ UA UG US UZ VN YU ZA ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 10477324 Country of ref document: US |
|
REG | Reference to national code |
Ref country code: DE Ref legal event code: 8642 |
|
122 | Ep: pct application non-entry in european phase |