ball-and-roller bearing

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• roller bearing — Mach. a bearing consisting of cylindrical or tapered rollers running between races in two concentric rings, one of which is mounted on a rotating or oscillating part, as a shaft. [1855 60] * * * One of the two types of rolling, or antifriction,… …   Universalium

• Roller skating — is the traveling on smooth terrain with roller skates. It is a form of recreation as well as a sport, and can also be a form of transportation. Skates generally come in two basic varieties: roller skates and inline skates or blades, though some… …   Wikipedia

• Tapered roller bearing — Tapered roller bearings are bearings that can take large axial forces (i.e. they are good thrust bearings) as well as being able to sustain large radial forces. DescriptionThe inner and outer ring raceways are segments of cones and the rollers… …   Wikipedia

• Needle roller bearing — A needle roller bearing A needle roller bearing is a bearing which uses small cylindrical rollers. They are used to reduce friction of a rotating surface. Needle bearings have a large surface area that is in contact with the bearing outer… …   Wikipedia

• Bearing (mechanical) — A bearing is a device to allow constrained relative motion between two or more parts, typically rotation or linear movement. Bearings may be classified broadly according to the motions they allow and according to their principle of operation as… …   Wikipedia

• ball bearing — ball bearing, adj. Mach. 1. a bearing consisting of a number of hard balls running in grooves in the surfaces of two concentric rings, one of which is mounted on a rotating or oscillating shaft or the like. 2. any of the balls so used. [1880 85]… …   Universalium

• Ball bearing — For individual balls that are sometimes called ball bearings , see Ball (bearing). Working principle for a ball bearing …   Wikipedia

• bearing — /bair ing/, n. 1. the manner in which one conducts or carries oneself, including posture and gestures: a man of dignified bearing. 2. the act, capability, or period of producing or bringing forth: a tree past bearing. 3. something that is… …   Universalium

• Roller derby — For the skate brand of the same name, see Roller Derby (brand). Roller derby Charm City Roller Girls (Baltimore, Maryland). Characteristics Contact Collision C …   Wikipedia

• bearing — [1] The area of a unit in which the contacting surface of a revolving part rests in order to minimize wear and friction between two surfaces. [2] An antifriction reducing device that is usually found between two moving parts. The babbitt bearings …   Dictionary of automotive terms

• roller — n. 1 a a hard revolving cylinder for smoothing the ground, spreading ink or paint, crushing or stamping, rolling up cloth on, hanging a towel on, etc., used alone or as a rotating part of a machine. b a cylinder for diminishing friction when… …   Useful english dictionary