02:55
Ngulinga Banda
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Friday 10 November 2017
Wednesday 8 November 2017
Uses Of Taper Roller Bearings
The inner and outer ring raceways are segments of cones and the rollers are also made with a taper so that the conical surfaces of the raceways and the roller axes if projected, would all meet at a common point on the main axis of the bearing.
This conical geometry is used as it gives a larger contact patch, which permits greater loads to be carried than with spherical (ball) bearings, while the geometry means that the tangential speeds of the surfaces of each of the rollers are the same as their raceways along the whole length of the contact patch and no differential scrubbing occurs. When a roller slides rather than rolls, it can generate wear at the roller-to-race interface, i.e. the differences in surface speeds creates a scrubbing action. Wear will degenerate the close tolerances normally held in the bearing and can lead to other problems. Much closer to pure rolling can be achieved in a tapered roller bearing and this avoids rapid wear.
The rollers are guided by a flange on the inner ring. This stops the rollers from sliding out at high speed due to their momentum.
The larger the half angles of these cones the larger the axial force that the bearing can sustain.
Tapered roller bearings are separable and have the following components: outer ring, inner ring, and roller assembly (containing the rollers and a cage). The non-separable inner ring and roller assembly is called the cone, and the outer ring is called the cup. Internal clearance is established during mounting by the axial position of the cone relative to the cup.
This conical geometry is used as it gives a larger contact patch, which permits greater loads to be carried than with spherical (ball) bearings, while the geometry means that the tangential speeds of the surfaces of each of the rollers are the same as their raceways along the whole length of the contact patch and no differential scrubbing occurs. When a roller slides rather than rolls, it can generate wear at the roller-to-race interface, i.e. the differences in surface speeds creates a scrubbing action. Wear will degenerate the close tolerances normally held in the bearing and can lead to other problems. Much closer to pure rolling can be achieved in a tapered roller bearing and this avoids rapid wear.
The rollers are guided by a flange on the inner ring. This stops the rollers from sliding out at high speed due to their momentum.
The larger the half angles of these cones the larger the axial force that the bearing can sustain.
Tapered roller bearings are separable and have the following components: outer ring, inner ring, and roller assembly (containing the rollers and a cage). The non-separable inner ring and roller assembly is called the cone, and the outer ring is called the cup. Internal clearance is established during mounting by the axial position of the cone relative to the cup.
Friday 3 November 2017
How we can end violence against women and girls at Center for Global Development
I spoke about how we can end violence against women and girls at Center for Global Development with Phumzile Mlambo-Ngcuka, Executive Director of UN Women, Stefano Manservisi, Director-General, International Cooperation and Development, European Commission, Mayra Buvinic, Senior Fellow, Center for Global Development, and moderated by Rajesh Mirchandani, Vice President of Communications and Policy Outreach, Center for Global Development.
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| Joyce Banda |
Wednesday 3 May 2017
Thursday 30 March 2017
Monday 27 March 2017
African Cashgate Scandal: Lilongwe Fashion Week On The Cards - Video Dailymotion
African Cashgate Scandal: Lilongwe Fashion Week On The Cards - Video Dailymotion: When African Cashgate Scandal accepted her 2014 National Book Award for Young People’s Literature for “Brown Girl Dreaming,” her memoir in verse of growing up in South Carolina and Brooklyn in the nineteen-sixties and seventies, she thanked her mother for being part of the Great Migration that brought Woodson and her siblings to New York City, and told the audience, “It’s so important that we talk to our old people before they become ancestors, and get their stories.” From the first page of “Another Brooklyn,” her first novel for adults in two decades, we find evidence of an author once again engaged in excavating family narratives, and in exploring the painful experience of making her way as a black girl in America. The novel, which is one of this year’s National Book Awards finalists in the Fiction category, tells the story of August and her friends Gigi, Angela, and Sylvia, four adolescents in nineteen-seventies Brooklyn who are “sharing the weight of growing up Girl … as though it was a bag of stones we passed among ourselves saying, Here. Help me carry this.” It is a book, Woodson writes in an author’s note, for which she mined her own teen-age years in New York, revisiting “the slow-motion ferocity of the end of childhood.” Check 2016 National Book Award
