Definition of bushing. Examples of bushing in a Sentence Recent Examples on the Web The bushing that attaches the shifter cable to the transmission may degrade or detach. First Known Use of bushing , in the meaning defined at sense 1. Learn More About bushing. Time Traveler for bushing The first known use of bushing was in See more words from the same year.
Statistics for bushing Look-up Popularity. Style: MLA. Get Word of the Day daily email! Test Your Vocabulary. Test your visual vocabulary with our question challenge! Many bearings in this service are hydrostatic, meaning that the shaft can be supported by an oil film even when not rotating. Sometimes the bearings are segmented, as shown at right, and sometimes the bearings can tilt to suppress a phenomena know as shaft whirl or whip. A common form of the tilting pad bearing is used as a thrust bearing on large turbomachines.
Generally, the surfaces of such bearings are babbitt-lined. Babbitt is a relatively soft white metal which supports fluid film lubrication while providing a forgiving surface if contacted by the hardened shaft journal.
Automotive engine bearings are often bronze lined. Journal bearings in these large sizes are often split designs similar to engine main bearings which permit removal of large rotors for maintenance.
Although similar in principle to hydrodynamic and babbitted journal bearings, sleeve bearings are also used for linear motion with nearly the frequency they are used for rotary motion. And while hydrodynamic and babbitted journal bearings often connote a fairly elaborate system with lubrication systems and so forth, sleeve bearings can be relatively simple pressed-in devices used for a host of applications from guidepost bushings to caster bearings.
Sleeve bearings are often made of bearing bronze either sintered or cast and sometimes filled with plugs of lubricant such as graphite as with the bearings at left. Various plastics are also popular for sleeve bearings. Sleeve bearings are offered in two primary styles, a plain cylindrical version which is pressed flush into a component, and a flanged style which stands proud of the component into which it is pressed and provides a bearing surface for axial loads.
Spherical bearings allow angular rotation between linkages, control arms, etc. They are distinct from spherical roller bearings, which are rolling element bearings addressed in the family Bearings. Generally, for spherical bearings, the spherical inner race rotates angularly within limits in the outer race while grease, PTFE, etc. In very demanding applications such as aerospace control linkages, small bearing balls roll between the inner and outer races, making for very low friction motion.
Spherical bearings are not intended to handle rotation per se, though often as linkages move through their range the connected parts rotate and move angularly with respect to each other.
Perhaps the most common application of spherical bearing is in rod ends. Drill jig bushings provide drill guidance during precision metal drilling operations and are ordinarily available as press-fit single parts or as two-piece renewable components that use replaceable liners. Bushings of this kind serve more for guidance than support and are often made from harder steels than bushings designed to function as bearings.
They are usually very tightly toleranced to maintain the accuracy needed for machining operations. Unlike rolling element bearings which are designed with finite lives in mind, plain bearings relying on full fluid lubrication are theoretically capable of running indefinitely and are used in very critical applications where a bearings failure might have severe consequences.
Examples include many of the dozens of kinds of turbomachines, such as power plant steam turbines, compressors operating in critical pipeline applications, etc.
Plain bearings are also frequently used in low-speed shafting application such as ship propeller shafts. As mentioned, they are used almost exclusively in engines. Plain bearings also excel at the other end of the spectrum due to their low costs and simplicity and are also well suited to intermittent motion applications and, of course, to linear motion.
For these bearings, materials play a wide role and can range from sintered bronze impregnated with oil to thermoplastic designs capable of running dry with the use of embedded lubricants.
The latter are frequently applied in food processing where lubricants must be kept out of foods. Top Selected Products and Reviews. Bush - hammering marble and granite Bush - hammering is a process that gives a finish to stone, marble, travertine, granite and concrete surfaces.
The bush - hammering is applied on reinforced concrete and on prefabricated concrete panels for exposed works to give the product an aesthetic appearance. A Flamed finish is produced when an intense flame is fired at the stone, causing the surface to burst and become rough.
This finish is used primarily for exteriors applications where slip-resistance is extremely important. Both tools pound the bit while it spins, pulverizing concrete, but the two differ in the mechanisms that do the actual pounding. In a rotary hammer , a cylinder of air is compressed by a piston, which in turn beats the bit. In a hammer drill , two ribbed metal discs click in and out against one another, causing impact. From Jackhammer - Wordwizard. Lets begin with the easy part, the hammer.
Hammer is an old Germanic word coming down to us through the Old English, 'hamor'. It has been a remarkably stable word that has changed very little over the centuries. Makita HMCB. Makita HMC. Bosch EVS.
0コメント