Joy valve gear is a type of steam locomotive valve gear, designed by David Joy (3 March 1825 – 1903), Locomotive and Marine engineer, and patented (no. 929) on 8 March 1879.[1] The British patent has not been found but the US patent (US252224 of 10 January 1882) has.[2] Joy's gear is similar to Hackworth valve gear but has a compensating mechanism which corrects for "the slight inequality in the motion of the valve arising from the arc of the lever".[3]
The drawing (right) shows the Joy gear as applied to a London and North Western Railway locomotive.[4] The US patent shows several modifications of the gear. In figure 6 of the patent, one of the levers has been replaced by a slide.
On 10 January 1882, Mr. Joy received U.S. Patent No. 252,224 for the invention.
^"David Joy's Diaries". 1878–9 Winter. Archived from the original on 4 March 2015. Retrieved 10 February 2015.
^"Espacenet - Original document". worldwide.espacenet.com. Retrieved 20 January 2021.
^Lines 35-50 of the US patent specification
^Scientific American Supplement, No. 458, October 11, 1884 by Various
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steam to two 17 by 24 inches (430 by 610 mm) cylinders connected by Joyvalvegear to the driving wheels. They were effectively a tank version of the LNWR...
saturated steam to two 18 by 24 in (457 by 610 mm) cylinders connected by Joyvalvegear to the driving wheels. The dimensions quoted in the class title could...
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class; they had larger boilers and smaller driving wheels, and while the Joyvalvegear for the HP and LP cylinders could still be independently adjusted, it...
Engineer journal in 1883 carried a photograph of a Neilson 4-6-0 with Joyvalvegear produced for the Cape Government Railways. In 1884, Neilson left to...
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