Axial piston pump (English name: Piston pump) is the direction of reciprocation of the piston and the cylinder center axis parallel to the piston or plunger. Use and shaft parallel axial piston pump plunger plunger bore volume changes produced in reciprocation to work. Since the plunger, and the hole is circular parts, the processing can achieve a high precision fit, so high volumetric efficiency. Straight shaft swashplate piston pump swash plate type piston shaft straight into pressure oil type and self-absorbing two. Pressure oil hydraulic pump are mostly used have pressure tank, rearward pressure hydraulic oil tank after each start the machine, such as hydraulic stains box must use air pressure to operate machinery. Such as insufficient air pressure on the hydraulic tank to start the machine, and slip inside the pump will whip phenomenon caused by the pull-off, the pump will cause abnormal wear of the return of the body plate and the pressure plate. Radial Radial Piston Pump can be divided into valve with flow and axial flow of two categories. Radial piston pump with flow valve malfunction rate, efficiency piston pump and low defects. International development axes 70,80 radial piston pump with flow valve with flow overcomes deficiencies radial piston pump. Because the characteristics of radial pump structure, fixed ratio of axial flow axial piston pump radial piston impact resistance, long life, high control accuracy. Variable short stroke of the pump under variable is the variable effect of the plunger and the stopper of the plunger, to achieve changing the eccentricity of the stator, and the maximum eccentric distance is set at 5-9mm (depending on the size of the displacement), a short stroke of the variable . And a high-pressure variable displacement mechanism is designed to manipulate the control valve is controlled. Therefore, fast response speed of the pump. Radial structure designed to overcome, such as axial piston pump shoe eccentric wear problems. The ability to impact greatly improved. After the hydraulic piston by hydraulic pressure of the hydraulic oil tank after each start the machine, such as hydraulic stains box must use air pressure to operate machinery. Straight shaft swashplate piston divided into two kinds of pressure from the sucking oil type. Pressure oil hydraulic pump powered by the pressure of the tank there, but also pump up the oil itself with the cylinder to provide pressure oil pump inlet. Since self-suction type pump suction strong, without external fuel supply. Edit this paragraph structure form into the form of axial piston pump piston pumps and radial piston pump two kinds of representative structures; piston-cylinder radial piston pump piston due to belonging to a new high-tech efficient pump, with the localization of accelerating, radial piston plunger pump is bound to become an important part of application areas; specific detailed radial piston Wikipedia, following only the axial piston pump Case will be explained. Axial piston pump is to use a plunger and shaft parallel to the volume change produced by reciprocating motion of the piston bore in to work. Since the plunger, and the hole is circular parts, the processing can achieve a high precision fit, it has a high volumetric efficiency, smooth operation, flow uniformity, low noise, working pressure higher merit, but the hydraulic oil more sensitive to pollution, the structure is more complex, higher cost. MCY14-1B: Quantitative piston SCY14-1B: Manually variable displacement piston pump YCY14-1B: pressure variable displacement piston pump BCY14-1B: electro-hydraulic control piston PCY14-1B: constant pressure variable displacement piston pump piston pump pumping mechanism includes two sets of precision coupling: a plunger (plunger) + plunger sleeve (barrel) constitute Plunger (plunger and barrel assembly) (Figure 5-11), the oil valve (delivery valve) and the oil Seat (delivery valve seat) constitute the oil valve dual pieces (delivery valve assembly plunger and plunger sleeve is a pair of precision coupling, after pairing grinding are not interchangeable, requiring high accuracy and finish and good wear resistance , and its radial clearance of 0.002 ~ 0.003mm cylindrical surface of the plunger head has a cutting chute and through the radial bore, an axial bore communicating with the top, the aim is to change the amount of oil circulation; manufactured plunger sleeve after the forward, back hole, were associated with the low pressure oil pump body cavity communicates the plunger into the pump upper body suit, application screw positioning. plunger head chute different location, change the amount of oil by different methods. the oil valve and the oil valve is a pair of precision coupling, grinding after pairing are not interchangeable, with the gap of 0.01mm. the oil valve is a one-way valve, the spring pressure, valve cone surface and the upper valve Block tight fit for its role in stopping when the upper chamber and the plunger high-pressure pipeline isolation, pressure tubing to prevent the oil from flowing into the fuel pump down inside the lower part of the oil valve was cross sections, both driven, but also by diesel fuel. There under the oil valve cone is a small cylindrical surface, called the decompression zone, and its role in fueling the end when, within the hydraulic pressure tubing drop rapidly to avoid the spray holes produced drip phenomenon. When the seat belts in the fall makes the top of the volume quickly increases, pressure decreases rapidly, Minting quickly when editing phase of this paragraph, a cam on the camshaft and injection pump plunger spring Under the action, forcing the plunger, the lower piston to reciprocate, thus completing the task pump oil pump oil can be divided into the following three stages Conclusion: By the above discussion, the following conclusions ① total reciprocating plunger stroke L is constant, determined by the cam lift. ② plunger amount of oil depends on the size of each cycle stroke oil, fuel trip from variable camshaft control. ③ start time does not vary with the oil supply Oil change itinerary changes. ④ can change the rotation of the plunger oil ending time, thus changing the amount of oil the United States Parker piston classified -PV032L1E1A1NECC3. Domestic Series plunger-type injection pump piston pumps are mainly domestic series A, B , P, Z and Ⅰ, Ⅱ, Ⅲ No other series. series is based on a single-cylinder diesel engine power range of different requirements on the amount of oil to the piston stroke, the pump cylinder center distance and the type of construction is based, and then were accompanied different sized plunger diameter, composed of several kinds of work in a varying amount of oil circulating pump, in order to meet the needs of a variety of diesel engines. Domestic series injection pump working principle and structure type is basically the same example to introduce the A-type pump structure and operating principle of the plunger injection pump. Piston pump consists of four major components: cylinder, fuel adjustment mechanism, transmission and piston pump for domestic latest intelligent microprocessor intelligent control, LCD display, you can communicate with the computer, with a working pressure is stable, pulsation is small, easy to operate. Widely used in biochemical, pharmaceutical, chemical, environmental protection and other industries, to meet industry needs more continuous constant voltage, constant current transmission fluid requirements. 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