WordNet
- a bearing designed to take thrusts parallel to the axis of revolution
- push forcefully; "He thrust his chin forward"
- verbal criticism; "he enlivened his editorials with barbed thrusts at politicians"
- push upward; "The front of the trains that had collided head-on thrust up into the air" (同)push_up
- press or force; "Stuff money into an envelope"; "She thrust the letter into his hand" (同)stuff, shove, squeeze
- force (molten rock) into pre-existing rock
- relevant relation or interconnection; "those issues have no bearing on our situation"
- (of a structural member) withstanding a weight or strain
- dignified manner or conduct (同)comportment, presence, mien
- a rotating support placed between moving parts to allow them to move easily
- the direction or path along which something moves or along which it lies (同)heading, aim
PrepTutorEJDIC
- 《様態・方向の副詞句を伴って》…‘を'『強く押す』,急に押す,押し付ける / (…に)…‘を'『突っ込む』,突き刺す《+名~into(through)+名》 / (ある立場・境遇・状態などへ)〈人など〉‘を'急に押しやる《+名+into+名》 / (…を)『押す』,突く《+at+名》 / (…を)押し分けて進む《+through+名》 / 『一押し』,『一突き』 / 電撃的攻撃 / (プロペラ・ロケット・ジェットなどの)推進力
- 〈U〉『態度』,ふるまい / 〈C〉〈U〉(…に対する)『関係』,関連《+『on』(『upon』)+『名』》 / 〈U〉忍耐,がまん / 〈C〉《複数形で》『方角』,方位 / 〈U〉子を産むこと,出産;実を結ぶこと / 《複数形で》(機械の)軸受け,ベアリング
- =through
Wikipedia preview
出典(authority):フリー百科事典『ウィキペディア(Wikipedia)』「2013/03/23 01:17:43」(JST)
[Wiki en表示]
A spherical roller thrust bearing
A thrust bearing is a particular type of rotary bearing. Like other bearings they permit rotation between parts, but they are designed to support a high axial load while doing this.
Thrust bearings come in several varieties.
- Thrust ball bearings, composed of ball bearings supported in a ring, can be used in low thrust applications where there is little axial load.
- Cylindrical thrust roller bearings consist of small cylindrical rollers arranged flat with their axes pointing to the axis of the bearing. They give very good carrying capacity and are cheap, but tend to wear due to the differences in radial speed and friction which is higher than with ball bearings.
- Tapered roller thrust bearings consist of small tapered rollers arranged so that their axes all converge at a point on the axis of the bearing. The length of the roller and the diameter of the wide and the narrow ends and the angle of rollers need to be carefully calculated to provide the correct taper so that each end of the roller rolls smoothly on the bearing face without skidding. These are the type most commonly used in automotive applications (to support the wheels of a motor car for example), where they are used in pairs to accommodate axial thrust in either direction, as well as radial loads. They can support rather larger thrust loads than the ball type due to the larger contact area, but are more expensive to manufacture.
- Spherical roller thrust bearings use symmetrical rollers of barrel shape, rolling inside an outer race with a spherical inner surface. They can accommodate combined radial and axial loads and also accommodate misalignment of the shafts. They are often used together with radial spherical roller bearings.
- Fluid bearings, where the axial thrust is supported on a thin layer of pressurized liquid—these give low drag.
- Magnetic bearings, where the axial thrust is supported on a magnetic field. This is used where very high speeds or very low drag is needed, for example the Zippe-type centrifuge.
They are commonly used in automotive, marine, and aerospace applications.
Thrust bearings are used in cars because the forward gears in modern car gearboxes use helical gears which, while aiding in smoothness and noise reduction, cause axial forces that need to be dealt with. The double helical or herringbone gear balances the thrust caused by normal helical gears.
One specific thrust bearing in an automobile is the clutch "throw out" bearing, sometimes called the clutch release bearing.
Contents
- 1 Fluid film thrust bearings
- 2 Thrust ball bearing
- 3 See also
- 4 External links
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Fluid film thrust bearings
Exploded view of a Michell type thrust bearing. Note, each sector shaped pad can pivot on the ridges on the lower plate
Fluid-film thrust bearings were invented by Australian engineer George Michell (pronounced Mitchell) who patented his invention in 1905. Michell bearings contain a number of sector-shaped pads, arranged in a circle around the shaft, and which are free to pivot. These create wedge-shaped regions of oil inside the bearing between the pads and a rotating disk, which support the applied thrust and eliminate metal-on-metal contact.
Michell's invention was notably applied to the thrust block in ships. The small size (one-tenth the size of old bearing designs), low friction and long life of Michell's invention made possible the development of more powerful engines and propellers. They were used extensively in ships built during World War I, and have become the standard bearing used on turbine shafts in ships and power plants worldwide. (See also Fluid_bearing#Michell/Kingsbury_tilting-pad_fluid_bearings)
Thrust ball bearing
Thrust ball bearings consist of two precision chrome steel washers (ring) and a ball complement spaced by bronze retainer. They can be supplied with or without radius ball grooves in the rings. Thrust bearings are used under purely axial loads.
See also
- Race (bearing)
- Slewing bearing
External links
- The MichellThrust Bearing: a low-friction bearing for thrust shafts (Powerhouse Museum website)
UpToDate Contents
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English Journal
- Long-term functional outcome after surgical repair of cranial cruciate ligament disease in dogs.
- Mölsä SH, Hyytiäinen HK, Hielm-Björkman AK, Laitinen-Vapaavuori OM.
- BMC veterinary research.BMC Vet Res.2014 Nov 19;10(1):266. [Epub ahead of print]
- BackgroundCranial cruciate ligament (CCL) rupture is a very common cause of pelvic limb lameness in dogs. Few studies, using objective and validated outcome evaluation methods, have been published to evaluate long-term (>1 year) outcome after CCL repair. A group of 47 dogs with CCL rupture treat
- PMID 25407015
- Laminar motion of the incompressible fluids in self-acting thrust bearings with spiral grooves.
- Velescu C1, Popa NC2.
- TheScientificWorldJournal.ScientificWorldJournal.2014 Jan 2;2014:478401. doi: 10.1155/2014/478401. eCollection 2014.
- We analyze the laminar motion of incompressible fluids in self-acting thrust bearings with spiral grooves with inner or external pumping. The purpose of the study is to find some mathematical relations useful to approach the theoretical functionality of these bearings having magnetic controllable fl
- PMID 24526896
- Biomechanical and energetic determinants of technique selection in classical cross-country skiing.
- Pellegrini B1, Zoppirolli C, Bortolan L, Holmberg HC, Zamparo P, Schena F.
- Human movement science.Hum Mov Sci.2013 Dec;32(6):1415-29. doi: 10.1016/j.humov.2013.07.010. Epub 2013 Sep 23.
- Classical cross-country skiing can be performed using three main techniques: diagonal stride (DS), double poling (DP), and double poling with kick (DK). Similar to other forms of human and animal gait, it is currently unclear whether technique selection occurs to minimize metabolic cost or to keep s
- PMID 24071549
Japanese Journal
- Granular experiments of thrust wedges: Insights relevant to methane hydrate exploration at the Nankai accretionary prism
- Yamada Yasuhiro,Baba Kei,Miyakawa Ayumu,Matsuoka Toshifumi
- Marine and Petroleum Geology 51, 34-48, 2014-03
- … Expulsion of formation fluids is significant during the prism accretion process, and the migration of these methane-bearing fluids exerts a strong control on the accumulation of hydrates. … Digital image correlation analysis indicated that the frontal thrust is generally active but older structures are also frequently reactivated. …
- NAID 120005357338
- ブルーベイカー ジャスティン,ブルーベイカー ジャスティン
- JTEKT engineering journal (1011), 45-48, 2013-10
- NAID 40019871515
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