146:. The clutches (Cunningham clutches) could be engaged independently permitting no drive, front only, rear only or four wheel drive. The clutches were operated by water pressing upon a rubber diaphragm which drove the friction surfaces together. Steam was applied to the hydraulics to provide the pressure. The outside of each clutch was surrounded by the brake shoes and blocks. The output of each clutch was to an intermediate shaft having a two chain pinions. Each of the pairs of chains from the motor drove a pair of sprockets in the gear case on each axle. Each gear case could be tensioned by a pair of chain braces. Between the sprockets was a pinion that engaged with the crown wheel of the differential. The front differential assembly also contained a
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and 5 inches (89 and 127 mm) diameter respectively, with a common stroke of 5 inches (130 mm). However the truck was supplied with a valve that could convert the compound working to all cylinders receiving full high pressure. The engine shaft was common to both power units, running across
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The truck was the product of The
Cunningham Engineering Co., located in the Tremont Building in Boston. It was reported that vehicles of three, six, and eight short tons (2.7, 5.4, and 7.3 metric tons) were being built as of October, 1900. There is no relationship known to the Cunningham
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had two coils, one for the feed water and one for the exhaust steam. The condenser cylinder had water from the water tank pumped through it to cool the coils. The boiler was designed for 200 psi (1,400 kPa; 14 bar) operation.
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The frame and cab were constructed of iron, 15 feet 10 inches (4.83 m) long by 5 feet 6 inches (1.68 m) wide. The wheels were of composite construction (cast iron, oak and steel) mounted on steel axles
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102:, one either side of each rear wheel. Weight from the load was thus taken directly to the wheels without any strain being placed upon the central part of the axle and
51:, in the United States. The firm was established in December 1900, with the intention of manufacturing the products that the Cunningham Engineering Company of
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There were two power units mounted between the wheels, visible as the boxes in the illustration. Each power unit was a
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161:, coal or liquid fuel. The boiler feed pump returned the condensate from a hot well to the boiler. The
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water-tube type, 4 feet (1.2 m) high and 25 inches (640 mm) in diameter. It could operate on
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inches (64 mm) in diameter. Steering was by rotating the rigid front axle on a "
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142:-inch (110 mm) pinion which engaged with gears on the two hydraulic
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cross-compound unit consisting of high- and low-pressure cylinders of
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the full width of the vehicle. The engine shaft was furnished with a
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55:, Massachusetts, planned to develop. Instead, they built a small
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Defunct motor vehicle manufacturers of the United States
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Vehicle manufacturing companies established in 1900
433:Motor vehicle manufacturers based in Massachusetts
393:"Advertisement for Cunningham Engineering Company"
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16:Defunct American motor vehicle manufacturer
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338:; Clark, Henry Austin Jr., eds. (1989).
98:". The rear axle was provided with four
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278:, illustration pp 12–13 and text p 14.
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391:Ingersoll, E.P., ed. (1900-11-07).
372:Ingersoll, E.P., ed. (1900-10-03).
342:Standard Catalogue of American Cars
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346:(2nd ed.). Iola, Wisconsin:
187:miles per hour (10 km/h).
169:With the engine running at 300
173:, the truck's speed was about
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374:"The Cunningham Steam Truck"
309:, pp 14–15 and illustration.
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448:All-wheel-drive vehicles
321:, illustration pp 12–13.
19:Not to be confused with
237:Kimes & Clark 1989
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32:Cunningham steam wagon
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21:Cunningham automobile
150:to permit steering.
348:Krause Publications
69:Rochester, New York
336:Kimes, Beverly Rae
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397:The Horseless Age
379:The Horseless Age
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153:The boiler was a
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403:(6). New York.
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57:steam powered
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49:Massachusetts
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443:Steam wagons
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361:. Retrieved
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104:differential
100:leaf springs
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363:October 12,
96:fifth wheel
75:Description
59:truck with
40:Steam Wagon
38:Cunningham
412:Categories
191:References
45:Pittsfield
329:Citations
163:condenser
155:vertical
144:clutches
182:⁄
137:⁄
122:⁄
89:⁄
418:Trucks
354:
148:gimbal
53:Boston
365:2023
352:ISBN
159:coke
36:The
401:VII
384:VII
171:rpm
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