2009年1月12日 · Motor sheave diameter = fan sheave diameter x fan rpm/motor rpm Ted . Upvote 0 Downvote. Jan 12, 2009 #3

2005年6月28日 · 1 - The smaller pulley will have less contact. You need a certain minimum contact around the smaller sheave which will limit how small it can be (based on larger sheave size and center distance). 2 - The smaller the pulleys, the more radial force they will put on the shafts and associated bearings for a given torque.

2004年5月7日 · Thanks for the responses. I have checked the bridon wire rope product data which advises a minimum D:d ratio of 16:1. But I will suggest possibly increasing the sheave size to reduce the risk of bend fatigue. The operation is only supposed to take a few hours and there should not be very much spooling in and out, hence reducing wear on the wire.

2002年7月4日 · Gabe (Welcome back Mr. Kott-ier, Sir.!) - I will venture to guess that the motor sheave right now is about 11 percent bigger than the fan sheave. If you go to direct drive (motors are usually ~1785 RPM) you'll lose flow. Go to the manufacturer. One needed given you forgot to give was make (e.g., Loren Cook) and model. They'll supply you the curve.

2001年11月29日 · I have a sheave like structure (bicycle wheel) made from aluminum channel. Wrapped around a 90 degree segment of the sheave is a rope with a tension of "T". The sheave has 6 spokes equally spaced. Given a particular cross section I …

2002年6月4日 · 4) A sheave is used to transfer linear motion i.e a block and tackle; whereas a pulley is used to transfer rotational motion i.e. a belt driven fan unit. I like this one the best but am unsure if it is fact. I think there is really a difference but in this period of history I think the exact definitions are truly lost.

2011年5月15日 · Geometrically: look at the angle of the sheave tangential to the cable contact diameter along the cable centerline. When the angle becomes larger than this the cable will start to apply a side load on the sheave groove and will slide across it (welcome to the involute function) and begin to wear the sheave.

2002年12月10日 · In Britain we use BS853:1957 to calculate the design of Runway Beams. A Beam the size of U/B762x267 (173kg/m) would be capable of taking the load you require 10,000kg, taking into account the dynamic load of 125% for the electric hoist, and that the hoist trolly would be running at worst on the edge of the lower flange.

2009年6月7日 · Pulley (sheave) size or diameter will be highly dependant on the wire rope size and type. The ratio of sheave to rope diameters can range from 15 to 30. I would suggest that you get reference material such as Mark or Kent ME Hanbooks and Shapiro's Cranes and Derricks.

2004年7月29日 · I am looking for a resource for sheave design guidelines. Any reference that will help me determine appropriate geometries for the given ropes that I am using. My favorites, Mark's handbook, as well as machinery's handbook, aren't very detailed on things like inner radius, lead in angle, and other basic design guidelines to follow.