EP0205831A2 - Axial plunger pump with double endface oil distribution - Google Patents

Axial plunger pump with double endface oil distribution Download PDF

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Publication number
EP0205831A2
EP0205831A2 EP19860105934 EP86105934A EP0205831A2 EP 0205831 A2 EP0205831 A2 EP 0205831A2 EP 19860105934 EP19860105934 EP 19860105934 EP 86105934 A EP86105934 A EP 86105934A EP 0205831 A2 EP0205831 A2 EP 0205831A2
Authority
EP
European Patent Office
Prior art keywords
oil
casing
pump
plunger
slots
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19860105934
Other languages
German (de)
English (en)
French (fr)
Inventor
Wen Desheng
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yanshan University
Original Assignee
Yanshan University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yanshan University filed Critical Yanshan University
Publication of EP0205831A2 publication Critical patent/EP0205831A2/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F04B1/2014—Details or component parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F04B1/2014—Details or component parts
    • F04B1/2064—Housings

Definitions

  • Axial plunger pump is one of fairly ideal hydraulic pumps for high pressure and high speed applications.
  • Various closed passage type axial plunger pumps used today have in common the hydraulic oil to be taken into cylinder chamber from one end of plunger, the reciprocating movement of plunger compresses low pressure oil in the chamber, changes oil pressure from low to high at outlet.
  • the performance features and high speed running of this kind of pumps are often affected by plunger heating and heat caused by friction between individual components, wear resulted from heating limits service life of the pump.
  • Northeast Heavy Machine Institute published a research report on axial plunger pump with double endface oil distribution in 1984.
  • This cooling and lubricating effect significantly improves the situation of heat and wear of parts and components, such as plunger, chamber, various friction pairs etc., as a result, greatly enhances the durability of use of the pump, makes plunger pump more capable to run under higher pressure and higher speed.
  • Present invention integrates the principle of double endface oil distribution together with such piston pump design as swashplate pump, through shaft pump etc. By cutting holes, slots, notches on pump body, casing, variable flow casing to induce an oil flow path, a new type axial plunger pump with extremely easy intake of oil from both ends of a straight oil distributing plate and a swashplate is formed.
  • this pump produces less heat, decreases oil temperature, lowers the pump casing temperature by about 20°C in comparison with previous plunger pumps, improves lubrication, makes less noise, decreases noise level by 5 dB, reduces wear greatly, prolongs service life by more than 10 times.
  • this pump shows good technical features, and by eliminating return pipe for leaked oil in construction, its installation and use become more convenient, thus a significant economical benifit can be obtained.
  • Present invention includes two parts: a main part. which consists of pump body, casing, driving shaft, cylinder block, plunger slide shoe, straight oil distributing plate, and a variable flow mechanism which consistes of variable flow casing, swashplate (variable flow head), variable flow part: wherein the chamber which consists of oil distributing port on straight oil distributin gplate, intake port on swashplate, holes in slide shoe and plunger, and plunger hole in cylinder block, forms a double endface oil distribution system, characterized in that one or several small ports are machined on swashplate to form a ring shaped port in an area less than one half of a ring so that hydraulic oil from this port can enter into big holes in slide shoe and plunger.
  • the diameter of plunger hole should be made as large as allowed for maintaining adequate strength.
  • Hole in slide shoe is larger than hole in plunger so that oil flow is kept free when these tow parts are oblique to each other.
  • the endface of slide shoe runs coordinately with swashplate as a sealing ring, one half of sum of inner and outer diameters of said sealing ring (i.e. endface) is equal or approximate to plunger diameter, thus in addition to ensured sealing feature, running wear of slide shoe and seashplate is also reduced. Hydraulic oil flows from a branch passage of the intake passage in pump body through slots and notches in casing, variable flow casing, reaches the other side of swashplate.
  • plunger makes a straight reciprocating movement in the cylinder, when plunger extends out, that is, to suck oil, hydraulic oil enters into cylinder chamber from two ports, i.e. from intake port of straight oil distributing plate on one hand and intake port of swashplate, hole in slide shoe and plunger hole on the other hand, that is, hydraulic oil is sucked from both ends of the plunger simultaneously.
  • Position of intake port of swashplate is preferable at a circle with a radius equal to one half of sum of the long and short axes of ellipse trajectory along which slide shoe runs on swashplate. Both ends of intake ports of swashplate can be appended with noise absorbing slots.
  • the sealing ring at the endface of slide shoe may consists of one or several parts.
  • a half ring shaped hole connected with intake port can be cut in pump body, said hole is preferably formed by casting.
  • One or several small ports for oil passage can be cut in casing, variable flow casing, the total flow area of these ports is approximate to or large than flow area of branch passage.
  • the intake passage of swashplate may also be set at any position on casing or variable flow casing, if intake port is cut in casing, oil enters into chamber intake port of casing with one part of oil passing through notches in casing, slots in pump body, oil distributing port of straight oil distributing plate and another part of oil passing through slots in casing and variable flow casing, oil distributing port of swashplate, hole in slide shoe, plunger hole; if intake port is cut in variable flow casing, oil enters into chamber from intake port with one part of oil passing through slots in variable flow casing, oil distributing port of swashplate and another part of oil passing through slots in variable flow casing, slots and notches in casing, slots in pump body, oil distributing port of straight oil distributing plate. If all intake ports of pump body, casing, variable flow casing are put in one and the same oil tank so that oil can enter simultaneously, the objective of distributing oil from said both endfaces can also be realized.
  • Double endface axial plunger pump (Fig.l) includes two parts, wherein main part consists of a driving shaft 1, pump body 2, straight oil distributing plate 3, casing 4, cylinder block 5, plunger 6, slide shoe 7, big bearing 8, and variable flow mechanism consists of swashplate (variable flow head) 9, variable casing 10, variable flow part 12.
  • swashplate On swashplate (Fig. 8) there is a ring shaped port 21 which is less than one half of a ring and has two small ports to increase its mechanical strength. Said ports locate at a circle with radius equal to one half of sum of long and short axes of ellipse trajectory along which slide shoe runs on swashplate, such arrangement results in a maximum contact area between slide shoe and swashplate and minimun wear. At both ends of ports on swashplate are provided noise absorbing slots 22 which reduce noise level by 5 dB. Said ports together with holes 23, 24 in slide shoe and plunger (Fig. 5) form an oil intake passage which enables oil coming from both ends of swashplate to enter into the chamber formed by cylinder block 5, straight oil distributing plate 3, swashplate 9, plunger 6 and slide shoe 7.
  • Plunger 6 (Fig. 5). is a cylindrical body with a ball shaped end, in the center of which is provided a stepped hole 24, it is most preferable that said ball shaped end's neck has a minimum diameter permissible for a maximum slant angle between slide shoe and plunger.
  • slide shoe In the center of slide shoe there is a hole 23 (Fig. 5), diameter of which is larger than diameter of hole 24 of plunger.
  • the endface 25 of slide shoe represents sealing ring, it runs coordinately with swashplate, when one half of sum of its inner and outer diameters is equal or approximate to plunger diameter, the wear between swashplate and sealing ring is minimized.
  • Straight oil distributing plate 3 (Fig. 4) has two ring shaped ports 26, 27 which are less than one half of a ring, each consists of two small ports. Port 27 is suck port for low pressure oil while port 26 is delivery port for high pressure oil. These ports are at one and the same circumference. Straight oil distributing plate 3 together with swashplate 9 control the process of sucking and delivering oil of the pump when cylinder block rotates, thus the objective of supplying high proessure liquid is achieved.
  • one of the two oil passages consists of intake port 29 of pump body 2 (Fig.3) and oil sucking port 27 of oil distributing plate 3, while the other oil passage consists of branch passage 28 on intake port 29 of pump body (Fig. 3), notches and slots in casing (31 and 32 in Fig.6), slots in variable flow casing (33 in fig. 7), oil chamber (11 in Fig. 1), and holes 23, 24 in slide shoe and plunger (Fig. 5).
  • Branch passage 28 of intake port of pump body is a half ring shaped through hole connected with intake port 29 of pump body, said hole is preferably formed by casting.
  • Notch 31 in casing is half circle shaped, which area is equal to or greater than area of half ring port 28 in pump body, when assembled, these two ports should be matched to form a through passage.
  • the slot in casing (32 in'fig. 6) is located at a position of big bearing. It may comprise one or several slots, its or their total area of passage is greater than or equal to area of notch 31 in casing.
  • In variable flow casing there is one or several slots (33 in Fig. 7), the number of wliich is equal to the number of slots in casing, said slots are connected with those in casing, the area of slots in variable flow casing should be slightly greater than the area of slots in casing. From Fig.
  • Plunger 6 (Fig. 5) is a cylindrical body with a ball shaped end, in the center of which is provided a stepped hole 24, it is most preferable that said ball shaped end's neck has a minimum diameter permissible for a maximum slant angle between slide shoe and plunger.
  • slide shoe In the center of slide shoe there is a hole 23 (Fig. 5), diameter of which is larger than diameter of the hole 24 of plunger.
  • the endface 25 of slide shoe represents sealing ring, it runs coordinately with swashplate, when one half of sum of its inner and outer diameters is equal or approximate to plunger diameter, the wear between swashplate and sealing ring is minimized.
  • Straight oil distributing plate 3 (Fig. 4) has two ring shaped ports 26, 27 which are less than one half of a ring, each consists of two small ports. Port 27 is suck port for low pressure oil while port 26 is delivery port

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Gas Burners (AREA)
EP19860105934 1985-05-02 1986-04-30 Axial plunger pump with double endface oil distribution Withdrawn EP0205831A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN85103289 1985-05-02
CN198585103289A CN85103289B (zh) 1985-05-02 1985-05-02 双端面配油轴向柱塞泵

Publications (1)

Publication Number Publication Date
EP0205831A2 true EP0205831A2 (en) 1986-12-30

Family

ID=4793083

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860105934 Withdrawn EP0205831A2 (en) 1985-05-02 1986-04-30 Axial plunger pump with double endface oil distribution

Country Status (3)

Country Link
EP (1) EP0205831A2 (ja)
JP (1) JPS62189379A (ja)
CN (1) CN85103289B (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100424342C (zh) * 2006-07-11 2008-10-08 叶诗川 摆盘式滑阀配流轴向柱塞泵(马达)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101358585B (zh) * 2008-09-11 2011-11-16 谌小堰 斜曲轴变量柱塞泵
CN102052274B (zh) * 2009-10-30 2014-03-05 北京精密机电控制设备研究所 一种整体式阀配流柱塞泵
CN110848106A (zh) * 2019-12-27 2020-02-28 燕山大学 多路进油全流量自冷却双端面配流斜盘型轴向柱塞泵

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100424342C (zh) * 2006-07-11 2008-10-08 叶诗川 摆盘式滑阀配流轴向柱塞泵(马达)

Also Published As

Publication number Publication date
CN85103289B (zh) 1986-06-10
JPS62189379A (ja) 1987-08-19
CN85103289A (zh) 1986-06-10

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Inventor name: DESHENG, WEN