Select a Month
August, 2024 1 January, 2024 1 January, 2023 6 February, 2023 8 March, 2023 7 July, 2023 1 September, 2023 2 December, 2022 6 November, 2022 13 October, 2022 10 September, 2022 8 August, 2022 11 July, 2022 7 June, 2022 11 May, 2022 7 April, 2022 10 March, 2022 10 February, 2022 8 January, 2022 8 December, 2021 7 November, 2021 11 October, 2021 9 September, 2021 9 August, 2021 11 July, 2021 10 June, 2021 11 May, 2021 6 April, 2021 10 March, 2021 9 February, 2021 13 January, 2021 9 December, 2020 6 November, 2020 9 October, 2020 11 September, 2020 8 August, 2020 10 July, 2020 10 June, 2020 8 May, 2020 11 April, 2020 5 March, 2020 12 February, 2020 12 January, 2020 13 December, 2019 7 November, 2019 11 October, 2019 7 September, 2019 12 August, 2019 12 July, 2019 10 June, 2019 10 May, 2019 11 April, 2019 15 March, 2019 11 February, 2019 9 January, 2019 11 December, 2018 6 November, 2018 9 October, 2018 10 September, 2018 8 August, 2018 11 July, 2018 8 June, 2018 7 May, 2018 11 April, 2018 10 March, 2018 9 February, 2018 10 January, 2018 10 December, 2017 10 November, 2017 14 October, 2017 14 September, 2017 11 August, 2017 14 July, 2017 11 June, 2017 14 May, 2017 15 April, 2017 15 March, 2017 10 February, 2017 11 January, 2017 12 December, 2016 11 November, 2016 19 October, 2016 12 September, 2016 14 August, 2016 13 July, 2016 9 June, 2016 10 May, 2016 17 April, 2016 11 March, 2016 10 February, 2016 11 January, 2016 8 December, 2015 7 November, 2015 9 October, 2015 12 September, 2015 9 August, 2015 8 July, 2015 7 June, 2015 10 May, 2015 10 April, 2015 9 March, 2015 9 February, 2015 7 January, 2015 9 December, 2014 7 November, 2014 7 October, 2014 10 September, 2014 7 August, 2014 8 July, 2014 5 June, 2014 7 May, 2014 4 April, 2014 8 March, 2014 5 February, 2014 6 January, 2014 6 December, 2013 3 November, 2013 8 October, 2013 8 September, 2013 5 August, 2013 6 July, 2013 6 June, 2013 4 May, 2013 6 April, 2013 10 March, 2013 4 February, 2013 5 January, 2013 5 December, 2012 5 November, 2012 5 October, 2012 4 September, 2012 5 August, 2012 5 July, 2012 2 June, 2012 3 May, 2012 4 April, 2012 2 March, 2012 3 February, 2012 4 January, 2012 6 December, 2011 3 November, 2011 3 October, 2011 2 September, 2011 2 August, 2011 3 July, 2011 1 June, 2011 1 April, 2011 1 February, 2011 1 January, 2011 2 December, 2010 3 November, 2010 4 September, 2010 4 August, 2010 1 June, 2010 4 May, 2010 3 April, 2010 6 March, 2010 1 February, 2010 1 January, 2010 1 December, 2009 5 November, 2009 1 September, 2009 4 August, 2009 4 July, 2009 2 June, 2009 9 May, 2009 1 April, 2009 7 March, 2009 1Select a Category
literature
Article Brochure Catalogs Innovation Spotlight Success Stories Technical Articlesaltra-brands
Altra Industrial Motion Ameridrives Couplings Bauer Gear Motor Bibby Transmissions Boston Gear Delroyd Worm Gear Formsprag Clutch Guardian Couplings Huco Dynatork Inertia Dynamics Kilian Manufacturing Kollmorgen Lamiflex Couplings Marland Clutch Matrix International Nuttall Gear Portescap Stieber Clutch Stromag Svendborg Brakes TB Wood's Thomson Twiflex Ltd Warner Electric Warner Linear Wichita Clutchother
News Release Tradeshows Webinar Websiteproduct-platform
Belted Drives Couplings Electromagnetic Clutches-Brakes Engineered Bearing Assemblies Gearing Gear Motors Heavy Duty Clutches and Brakes Linear Products Overrunning ClutchesNuttall Gear Custom Gear Drives for Vertical Lift Bridge
Built in 1960, the Rio Vista (Helen Madere Memorial) bridge carries approximately 23,000 vehicles daily across the Sacramento River in Rio Vista, California. The 2,890 ft. long bridge features a 306 ft. long vertical lift span that raises to allow for passage of large freighter traffic. The bridge recently underwent a major renovation, including the replacement of the gearboxes.
One gearbox is installed in the mechanical room at the top of both lifting towers. The drives in both towers are synchronized for smooth, level deck lifting and lowering. Each gearbox has two input shafts that connect to the primary electric drive motor and an inching drive motor. Two large-diameter output shafts connect to twin cable pulley winches.
Based on a bridge site inspection and drawings from the original 60-year old competitor drives, Nuttall engineers worked with Caltrans, the bridge owner, and the bridge’s mechanical contractor to design new custom replacement gearboxes utilizing the latest gear technology. Two identical enclosed parallel-shaft primary reducers (plus two backups) with differentials, featuring a 60.5:1 ratio, an input of 30 HP @ 1200 RPM, an output of 19.8 RPM, and a service factor of 1.5 were supplied.
All drives featured fabricated steel housings and all welds were inspected by an Independent Certified Weld Inspector (CWI). Drives met a “Buy USA” requirement and were subjected to 150% load tests performed in-house.
