Trunnion – Knowledge and References

Explore chapters and articles related to this topic

Movable Bridges

Published in Wai-Fah Chen, Lian Duan, Bridge Engineering Handbook, 2019

Figure 21.18 is a typical welded sheave used for a vertical lift bridge. As shown, there are 16 rope grooves so this would be associated with a large vertical lift bridge. Typically there are four sheaves for a vertical lift bridge, one at each corner of the lift span. The trunnion bearing is not shown but would be similar to that shown in a bascule bridge trunnion. While sleeve bearings are commonly used, spherical type bearings are also considered to allow for trunnion flexure.

Building a 21st Century Newcomen Engine

View Article

Journal Information

Published in The International Journal for the History of Engineering & Technology, 2018

Ken Pointon, Andre Pointon

To start the engine from cold the main water tank is topped up and then the cistern is filled with the hand water pump. Following this the boiler is half filled with water and the fire is set and lit. While steam is being raised the main beam trunnion bearings and parts of the valve gear are oiled, the piston and lead piston weights are fitted into the cylinder and the piston top water added. As the engine is not used every day, the piston is removed to prevent it rusting the cast Iron cylinder and is stored in a bucket of water keeping the leather piston seal hydrated.