【正文】 the level of manufacturing, make its working pressure increased to 35 MPa, speed, and greatly improve inclined dish a leap in the history of the pump.The mid 1960s, due to the hydraulic system of integrated requirements, particularly in the applications of closed loop walk vehicles, axial pump has a new development. Spindle end can install auxiliary pump or other function, make the pump shaft pump has integrated many general function, the ponents of hydraulic system greatly simplifies the inclined dish, this is the development of pump/motor another leap.Since 1970s, Europe and many axial piston pump/motor manufacturers gradually rise, according to different fields do a lot of technical innovation, such as energy requirements for injection Vickers launch PVB light pump, Pump/motor and electronic technology bees more and more close, various control mode.In 1966, after a prehensive foreign swashplate piston pump is designed, and the characteristics CY141 type of axial piston pump/motor. After 30 years of practice, CY141 to have had four big improvement, before two with standardization and narrow volume, improve CY14 type 1A for. The third match against oil pan loss and inclined dish and process problems, formed CY14 type pump/motor 1B. The fourth for CY141B type, low noise, high speed, boots off yi song and garment, poor reliability selfpriming capacity, specifications and ventilation shafts all defects such as pumps, Q * * CY141Bk series pump and QT opentype low noise CY14 * * 1Bk through shaft pump series.In the 1990s, after entering in Germany Rexroth pany developed A4V pump. The plunger and drive into a job to intersect, centrifugal force plunger, also helps reduce the return flow, reduce cylinder diameters plate with the flow velocity, Using spherical flow, be helpful for pensation axial slanting load on cylinder of produce plex moment.Entering the 21st century, the Netherlands Innas pany design a Cup of Floating structure called the axial piston pump, as shown in figure 4. This is double pump plunger structure, similar to the superposition of two pump, it can balance the axial force of pump, reduce work load, reduce the bearings reduce noise, flow pulsation.From the first used in high pressure drainage to now, even the driver ultra plunger pump performance was huge, more and more widely.ii. classification parison and development trendAccording to flow, axial piston pump/motor can be divided into the valve and end with streaming with streaming, but by check valves with flow due to realize stepless variable flow, difficulty, selfpriming capacity and irreversible, accordingly its application, this paper will not less detailing.Will end with character, can divide swashplate axial and. Because of the pump/motor inclined shaft Angle than the pump/motor inclined dish, can achieve 40 176。, so as the hydraulic motor start torque output and the effect is good. But its structure is plex, the poor, and cannot realize ventilation shaft type structure, plus the variable structure is plex, the hydraulic field in modern pump as the application.Inclined dish pump besides inclined dish than axial pump Angle slightly smaller and other aspects have gained good performance. This paper will focus on inclined dish of pump is introduced.In recent years, the axial piston pump is the development trend of the below shows some new characteristics.i) highspeed, high pressure is axial piston pump/motor development direction. This reflects its power density, and make it can directly with the engine, application more convenient.ii) both quantitative and variable axial motor, due to start torque and good performance characteristics, have good prospects.iii) light axial piston pump due to cost around 20% higher than vane pump, but the high performance than, can pete with vane pump, this is the axial piston pump is a development trend of.iv) and electronic technology, bining various control method. Rexroth pany of electronic pump pressure, flow accurate closedloop control. Besides frequency conversion control in hydraulic elevator, gradually began to use plastic field.Second, the key technology and research situation(i) key lubrication and friction and wear optimization techniqueAxial piston pump/motor in its development process flow, plunger deputy vice and plunger with inclined dish contact vice (now basically is sliding boots structure) the friction pair has not occurred three big changes. They are oil absorption, oil pressure, flow pump/motor work pleted the most important link, also produce energy dissipation, leakage, flow pulsation of the pump/motor, the performance and life is closely related with the friction pair, thus friction pair of modification and optimization has bee the axial piston pump/motor is the most important one of the key technology.Purdue University (Purdue professor by Monika) leads the plunger of oil film dynamics space, friction and energy dissipation of the different shapes of plunger by friction, the distribution of cylindrical and not the best friction state of plunger shape, as shown in figure 5, and that the plunger piston cavity in the micro motion is more plex, as shown in figure 6, this movement can be simplified for piston axis of rotation, in A Zx section and B section in relative Zx shaft centerline of plunger X and Y directions in the direction of the partial distance vector e = {e1, e2, e3 and e4}, through the type (i) can be used to solve the plunger of the stress condition, the micro motion model is also obtained the corresponding experiment .Germany RWTH Aachen industrial university (Aachen) focused on pressure gradient and friction on the research and analysis of the piston pump/motor three pairs of friction distribution regularity with capacity.In addition, the overseas many research institutions for the relevant research. British University of Bath), leads (Japanese association (new) Niigata le