Скачать или смотреть Lecture 3 | Bearings | Machine Design

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00:01:39: The expected life of a ball bearing subjected to a load of 9800 N and working at 1000 RPM is 3000 hours. What is the expected life of the same bearing for a similar load of 4900 N and a speed of 2000 rpm?
00:08:44: If the load on a ball bearing is reduced to half, the life of the ball bearing will
00:12:09: Spherical roller bearings are normally used
00:13:09: The basic load rating of a ball bearing is
00:15:31: Ball bearings are rated by a manufacturer for a life of 10 revolutions. The catalog rating of a particular bearing is 16 kN. If the design load is 2 kN, the life of the bearing will be P x 10 revolutions, where P is equal to
00:18:25: Which of the bearings given below SHOULD NOT be subjected to a thrust load?
00:19:48: The dynamic load capacity of 6306 bearings is 22 kN. The maximum radial load it can sustain to operate at 600 rev/min, for 2000 hours is
00:24:58: The life of a ball bearing at a load of 10 kN is 8000 hours. Its life is in hours if the load is increased to 20 kN. keeping all other conditions the same is
00:29:12: A ball bearing operating at a load F has 8000 hours of life. The life of the bearing, in hours, when the
00:33:22: Two identical ball bearings P and Q are operating at loads 30 kN and 45 kN respectively. The ratio of the life of bearing P to the life of bearing Q is
00:36:01: For ball bearings, the fatigue life L is measured in a number of revolutions and the radial load F is related by FL K, where K is a constant. It withstands a radial load of 2 kN for a life of 540 million revolutions. The load (in kN) for a life of one million revolutions is
00:39:09: A self-aligning ball bearing has a basic dynamic load rating (C for 10 revolutions) of 35 kN. If the equivalent radial load on the bearing is 45 kN, the expected life (in 10 revolutions)
00:41:26: Starting friction is low in
00:42:06: In thick film hydrodynamic journal bearings, the coefficient of friction
00:42:56: To restore stable operating conditions in a hydrodynamic journal bearing, when it encounters higher magnitude loads
00:43:59: Which one of the following is a criterion in the design of hydrodynamic journal bearings?
00:45:30: A natural feed journal bearing of diameter 50 mm and length 50 mm operating at 20 revolutions/sec carries a load of 2 kN. The lubricant used has a viscosity of 20 mPa-s. The radial clearance is 50 um. The Sommerfeld number for the bearings is
00:48:03: A journal bearing has a shaft diameter of 40 mm and a length of 40 mm. The shaft is rotating at 20 rad/s and the viscosity of the lubricant is 20 mPa.s. The clearance is 0.020 mm. The loss of torque due to the viscosity of the lubricant is approximately


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