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A Roots blower with two-lobed rotors. Most real Roots blowers' rotors have three or four lobes. (animated version) Key:
Rotary vane 1
Pump body
Rotary vane 2
Intake
Pumping
Output
The Roots blower is a positive displacement lobe pump which operates by pumping a fluid with a pair of meshing lobes resembling a set of stretched gears. Fluid is trapped in pockets surrounding the lobes and carried from the intake side to the exhaust.
The Roots blower design does not incorporate any reduction in volume/increase in pressure as air or other fluid passes through, hence it can best be described as a blower rather than a supercharger unlike some other designs of "supercharger" such as cozette, centric, Shorrock supercharger, Powerplus supercharger and also the axial flow Eaton type supercharger which have internal "compression".
The most common application of the Roots-type blower has been the induction device on two-stroke diesel engines, such as those produced by Detroit Diesel and Electro-Motive Diesel. Roots-type blowers are also used to supercharge four-stroke Otto cycle engines, with the blower being driven from the engine's crankshaft via a toothed or V-belt, a roller chain or a gear train.
The Roots-type blower is named after American inventors and brothers Philander and Francis Marion Roots, founders of the Roots Blower Company of Connersville, Indiana USA, who patented the basic design in 1860 as an air pump for use in blast furnaces and other industrial applications. In 1900, Gottlieb Daimler included a Roots-style blower in a patented engine design, making the Roots-type blower the oldest of the various designs now available. Roots blowers are commonly referred to as air blowers or PD (positive displacement) blowers.[1]
^http://www.airblowerservices.com , Air Blower Services
The Rootsblower is a positive displacement lobe pump which operates by pumping a fluid with a pair of meshing lobes resembling a set of stretched gears...
inventors Philander Higley Roots and Francis Marion Roots. It is notable for the Rootsblower, a type of pump. Today, Rootsblowers are mainly used as air...
is usually based on their capacity per revolution. In the case of the Rootsblower, the GMC rating pattern is typical. The GMC rating is based on how many...
block with 567 series power assemblies. All 645 engines utilize either a Rootsblower or a turbocharger for cylinder scavenging. For turbocharged engines,...
was 33 percent higher than the 1,800 hp (1,340 kW) of the concurrent Rootsblower-equipped SD18s with the same engine displacement, 400 hp (298 kW) per...
than touch and turn each other. An early example of a lobe pump is the RootsBlower, patented in 1860 to blow combustion air to melt iron in blast furnaces...
diesel for evacuating the cylinders of exhaust gases, was performed by a Rootsblower. The Chieftain's L60 engine and cooling system were designed into an...
All Series 71 engines use uniflow scavenging, in which a gear-driven Rootsblower mounted to the exterior of the engine provides intake air through cored...
diesel engines use a scavenge blower or some form of compressor to charge the cylinders with air and assist in scavenging. Roots-type superchargers were used...
48-short-ton (44 t) Rootsblower, nicknamed "the Western Tornado", built by Roots Patent Force Rotary Blowers (see RootsBlower Company). When the car...
External vane pump Rootsblower, also called a booster pump, has highest pumping speeds but low compression ratio Multistage Roots pump that combine several...
compression-ignition with uniflow-ported cylinders. Scavenging was performed by a Rootsblower, which was mounted on the front of the engine and driven by a long quill...
equivalent to the "pips" worn by the army and police. Air pumps, such as the rootsblower, use meshing impellers to move air through a system. Applications include...
and exhaust ports are open at the same time. The engine usually has a Rootsblower to provide air for scavenging and this is arranged to deliver excess...
was 33 percent higher than the 1,800 hp (1,340 kW) of the concurrent Rootsblower-equipped SD18s with the same engine displacement. The SD24 had 400 hp...
over Roots-blown engines for the same engine displacement. But, unlike the earlier 645 and 567, which could use either turbochargers or Rootsblowers, EMD's...
circle may be freely chosen, mostly independent of the number of teeth. A Rootsblower is one extreme, a form of cycloid gear where the ratio of the pitch diameter...
16-567C RPM range 835 max Engine type V16 Two-stroke diesel Aspiration Rootsblower Displacement 9,072 cu in (148.66 L) Generator EMD D-12-B Traction motors...
1974 and 1980. It was equipped with a V12 12-645E engine sporting a Rootsblower. The length was either 47 ft 8 in (14.53 m) or 48 ft 8 in (14.83 m) depending...
compressor – Device used to pump gases at high pressure (piston compressor) Rootsblower – A positive displacement lobe pumpPages displaying short descriptions...
former owner). All 567 engines utilize forced induction, with either a Rootsblower or a turbocharger. The turbocharger (a combination turbo-compressor system)...
directly in the rod.[citation needed] The supercharger must be a 14-71 type Rootsblower. It has twisted lobes and is driven by a toothed belt. The supercharger...
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