Fixed
both gear pump and reciprocating pumps are positive displacement pumps.but the different is gear pump rotary type.reciprocating pump moves liner motion.the piston moves up and down in straight line.
Gear Pump.Additional answerI very much doubt if gear pumps are used in any petrol car because of the lack of lubrication. Much more likely is a diaphragm pump, which is certainly used on a lot of cars.
Positive Displacement meters like piston, gear etc
Gear pump is a positive displacement pump. (A positive displacement pump causes a fluid to move by trapping a fixed amount of it then forcing (displacing) that trapped volume into the discharge pipe. or A positive displacement pump has an expanding cavity on the suction side and a decreasing cavity on the discharge side. Liquid flows into the pump as the cavity on the suction side expands and the liquid flows out of the discharge as the cavity collapses. The volume is constant given each cycle of operation. A positive displacement pump can be further classified according to the mechanism used to move the fluid: a.Rotary-type, internal gear, screw, shuttle block, flexible vane or sliding vane, circumferential piston, helical twisted roots (e.g. the Wendelkolben pump) or liquid ring vacuum pumps. b.Reciprocating-type, for example, piston or diaphragm pumps. Gear pump is generally used for viscous fluid especially in hydraulic service. Gear pump are used for high head , low flow application. Widely used on car engine oil pumps. it is also used in various hydraulic power packs.. If you change the direction of gear pump ,suction will become discharge and discharge port become suction port. Gear pumps requires high degree of close clearances between gears and its housings. In centrifugal pump you will find above all in reverse . A centrifugal pump is a rotodynamic pump that uses a rotating impeller to increase the pressure and flow rate of a fluid. Centrifugal pumps are the most common type of pump used to move liquids through a piping system. The fluid enters the pump impeller along or near to the rotating axis and is accelerated by the impeller, flowing radially outward or axially into a diffuser or volute chamber, from where it exits into the downstream piping system. Centrifugal pumps are typically used for large discharge through smaller heads. Centrifugal pumps are most often associated with the radial flow type. However, the term "centrifugal pump" can be used to describe all impeller type rotodynamic pumps including the radial, axial and mixed flow variations. Gear pump is high efficiency pump while centrifugal pump will have relatively low efficiency.
A positive displacement pump causes a liquid or gas to move by trapping a fixed amount of fluid or gas and then forcing (displacing) that trapped volume into the discharge pipe. Positive displacement pumps can be further classified as either rotary-type (for example the rotary vane) or lobe pumps similar to oil pumps used in car engines.Moreover,these pumps give a non pulsating output or displacement unlike the reciprocating pumps and hence are called positive displacement pumps
both gear pump and reciprocating pumps are positive displacement pumps.but the different is gear pump rotary type.reciprocating pump moves liner motion.the piston moves up and down in straight line.
A gear pump uses the meshing of gears to pump fluid by displacement.[1] They are one of the most common types of pumps for hydraulic fluid power applications. Gear pumps are also widely used in chemical installations to pump fluid with a certain viscosity. There are two main variations; external gear pumps which use two external spur gears, and internal gear pumps which use an external and an internal spur gear. Gear pumps are positive displacement (or fixed displacement), meaning they pump a constant amount of fluid for each revolution. Some gear pumps are designed to function as either amotor or a pump.
Non-positive displacement has slippage inside the pump and it is a continous, variable flow. But positive displacement has no slippage inside the pump, and it is a constant flow.
Gear Pump.Additional answerI very much doubt if gear pumps are used in any petrol car because of the lack of lubrication. Much more likely is a diaphragm pump, which is certainly used on a lot of cars.
speed
because they deliver a fixed quantity of the discharge irrespective of their rpm
gear pump, crescent gear pump, axial-piston pump, radial-piston pump, linear-piston pump, & vane pump Also, fuel injection pumps such as linear piston pumps and rotary piston pumps.
These have to do with the hydraulic density. In automobile, the density increases therefore making the hydraulic ratio to displace more than any hydraulic ratio in a displacement.
Positive Displacement meters like piston, gear etc
A gear pump is taken into utilization for meshing of gears to pump fluid by displacement. Being the most common types of pumps for hydraulic fluid power applications, these advanced pumps are used in chemical installations to pump high viscosity fluids.Among some of the top Gear Pump Supplier, name of Terrekosen-Hydraulic comes on the top. A team of dedicated professionals has been working here, who have proven track record and years of experience.
the main difference between them is the way that energy is added to the fluid to be converted to pressure increase. In dynamic pumps, energy is added to the fluid continuously through the rotary motion of the blades. These rotating blades raise the momentum of fluid and the momentum then is converted to pressure energy through diffuser in pump outlet. In positive displacement pumps, the energy is added periodically to the fluid. the pump has reciprocating motion by pistons for example. When the fluid enters the pump through valves, the reciprocating piston begins to press the fluid resulting in going out of the pump with pressure rise.
the Pump does not control this, it is internal to the steering gear system, usually a "Steering Rack" Telling if or not will be a matter of getting the Steering Rack # and checking to see if it capable of variable boost.