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What does a shaft bearing do?, • The bearing keeps the shaft from wobbling as it rotates, and thus allows it, to spin smoothly so that power can be transferred efficiently.
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Introduction, • Bearings are machine elements that provide supports to a rotating shaft. The transmit the, , load from a rotating member to a stationary member known as frame or housing., • Bearing provide supports/stability for rotating members/shaft as well as permit free and, , smooth motion., , • The main purpose of bearings is to prevent direct metal to metal contact, , between two elements that are in relative motion. This prevents friction,, heat generation and ultimately, the wear and tear of parts.
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Introduction, • Bearing are classified according to the direction of pressure with respect to the axis of the shaft. Journal, bearings, Thrust Bearings (Pivot bearings and Collar bearings) are sliding contact type bearing in which, , the rotating shaft has sliding contact with the bearing and the friction between two is relatively high., • Ball Bearing & Roller Bearing are rolling contact bearings., , So, There are three main kinds of Shaft Bearings., 1) A Journal bearing: In which the bearing pressure is perpendicular to the axis of the shaft. The, , load on the bearing is perpendicular to the axis of the shaft. Solid, bushed and pedestal are the types, of journal bearing. In solid and bushed bearings, the shaft can be inserted endwise only. Hence,, they are generally placed only at or near the ends of the shaft., Eg: Solid bearing, Bushed Bearing, Pedestal Bearing or Plummer Block.
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Types of Shaft Bearing, 2) Thrust Bearing: These are used to support shafts subjected to axial loads. These, Bearings are classifies as follows:, , a) A Pivot bearing (Foot Step bearing) in which the pressure is parallel to the axis of the, shaft and the end of the shaft rests on the bearing surface., b) A Collar bearing or thrust bearing in which the pressure is parallel to the axis of the shaft, which is passed and extended through he bearing.
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Types of Journal Bearing
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Solid Bearing
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Bushed Bearing
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Bushed Bearing, • Bushed bearing is a somewhat modified version of solid bearing, consisting mainly two, , parts, the body and the bush., • For lubrication of the bearing, a oil hole is provided at the top of the body.
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Pedestal Bearing or Plummer Block, • A pedestal bearing or Plummer block consist of, , (i), (ii), (iii), (iv), , A cast-iron pedestal or block with a sole., Gun-metal brasses or steps made in two halves, A cast iron cap., Two mild-steels bolts., , • It is made in two halves to facilitate, (i) Placing and removal of the shaft in and from the bearings., (ii) Adjustment for wear in the brasses., (iii) Renewal of brasses.
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Pivot Bearing (Foot-Step Bearing)
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Pivot Bearing (Foot-Step Bearing)
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Wall Brackets
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Wall Brackets, • Wall brackets are sued for supporting bearings for shafts which run parallel to and near a, wall, or near a row of pillars., , • The vertical plate of the bracket is bolted to the wall or the pillar, either in direct contact, with it or with a wall-plate in-between., • The bearing is supported on the horizontal shelf.
