US3496873A - Axial-piston pump with control rods - Google Patents

Axial-piston pump with control rods Download PDF

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Publication number
US3496873A
US3496873A US693844A US3496873DA US3496873A US 3496873 A US3496873 A US 3496873A US 693844 A US693844 A US 693844A US 3496873D A US3496873D A US 3496873DA US 3496873 A US3496873 A US 3496873A
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United States
Prior art keywords
piston
axial
pistons
pump
control rods
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Expired - Lifetime
Application number
US693844A
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English (en)
Inventor
Klaus Winter
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Continental Teves AG and Co oHG
Original Assignee
Alfred Teves GmbH
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Publication date
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    • 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
    • F04B1/14—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 stationary cylinders
    • F04B1/18—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 stationary cylinders having self-acting distribution members, i.e. actuated by working fluid
    • 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
    • F04B1/122—Details or component parts, e.g. valves, sealings or lubrication means
    • F04B1/124—Pistons
    • 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
    • F04B1/14—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 stationary cylinders
    • 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
    • F04B1/26—Control
    • F04B1/28—Control of machines or pumps with stationary cylinders
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/08—Regulating by delivery pressure
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/12—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members

Definitions

  • the invention relates to a hydraulic machine and, more particularly, to an axial-piston pump comprisin a reservoir for the fluid medium in which the fluid is delivered to an array of pistons concentrically disposed about a drive shaft and driven in and out of their respective cylinders in a direction parallel to the drive shaft by rotation of a swash-plate hydraulic apparatus mounted on the drive shaft at a fixed (or possibly variable) angle of tilt relative to the shaft axis.
  • a more specific object of my invention is to p ovide an improved axial piston pump in which a swash plate tilted with respect to the axis of its supporting drive shaft rotates with respect to non-rotatable pistons concentrically disposed about a cylinder block and lon itud nally displaces the pistons in their cylinders, the direction of rotation being reversible.
  • Still ano her object of th s invention is to rovide an improved system for controllin the length of the efl ective piston stroke in order to vary the volume of the displaced hydraulic fluid and through it, the output to be deliver d by the axial-piston pump.
  • control rods slidably received in respective bores inside the pistons and passing through the intake valves which separate the intake chamber from the annular pumping chambers which serve as working spaces for the pistons.
  • the rods attached at one end to a support plate mounted in the cover of the pump housing and terminating in leading edges at their other ends, proximate to the swash plate, alternately block and unblock the thrust exerted upon the compression side of the intake valves by covering 0r uncovering, accordin to the desired length of the stroke, orifices which lead from the piston bore to the pumping chamber.
  • the support plate for the rods can be longitudinally displaced through interaction of a threaded spindle driven by gear means.
  • the longitudinal variation of the piston stroke through the control rods is effected by differential hydraulic action upon two piston surfaces of dissimilar area.
  • FIG. 1 is a longitudinal cross-sectional view of a pump according to my invention
  • FIG. 2 is an axial cross-sectional view taken on the line II-II of FIG. 1;
  • FIG. 3 is a longitudinal cross-sectional view showing alternate adjusting means for the assembly of FIG. 1.
  • a housing 1.9 which forms a cylinder block 19a and is closed at its lefthand and by a cover 20, with a seal 28 provided at the junction of these adjoining parts.
  • the hydraulic fluid e.g. oil
  • the compartment 6 is thus formed between the cover 20 and the cylinder block 19a.
  • the load is supplied with fluid under pressure from the outlet fitting 38 which forms part of an outlet means described in greater detail below.
  • the housing itself is attached by lugs 33 to a support.
  • Power from a prime or secondary mover is delivered to a drive shaft 1 which is journaled in sealed bearing 26 in a hearing plate 42 held in place by a split ring 27.
  • the inner end of drive shaft 1 includes a boss 29 which fits accurately for pivotal movement of a swash plate 2.
  • Swash plate 2 tilted at an acute angle relative to the axis of drive shaft 1, is rotated about the shaft axis on the shaft.
  • Swash plate 2 is rotatably supported by ball bearings 30 having an inner thrust race 31 (against which the swash-plate disk 2 applies the axial reaction force of the pumping action) and outer race 32 resting against plate 42.
  • the ball bearings are centered on the axis of drive shaft 1.
  • a recess 35a in the cylinder block 19a beyond the swash plate 2 receives roller (needle) bearings 35 to take up unequal radial forces developed during rotation of the swash plate in pumping action.
  • each piston fitted into a cylinder bore 7a, defines therewith a working space or pumping chamber 7 and is urged by springs 3 resiliently against a slidable piston shoe 4, swiveling on the head of the piston; thus each piston is driven back and forth in its cylinder as the orbiting swash plate alternately compresses and relieves the springs 3.
  • Fluid from the intake compartment is channeled through a double springloaded intake check valve 8 which has the form of a ringplate valve, to the pumping chambers 7, thence via the outlet check valve 9 and from there to a discharge duct 14 of the outlet means and via chamber 10 to the load.
  • a double springloaded intake check valve 8 which has the form of a ringplate valve
  • a bleeder screw 34 threaded into the pump housing, permits venting of air for priming the pump.
  • Each piston 5 contains in a longitudinal bore 5a through its center a compression rod 11 which at one end is firmly attached by a head 46 to a support plate 15 axially movable on the pump cover 20 and located in the intake compartment 6.
  • each control rod 11 has a leading edge 16 with which it alternately covers and uncovers, with each piston stroke, an orifice 17 which leads radially out of the piston bore and into a longitudinal channel 25 cut in the form of a groove in the outer piston surface and from there to the annular space 7.
  • the support plate 15 which holds the array of control rods 11 is threaded onto a spindle sleeve 14 forming the fluid passage or outlet duct inside the cover 20.
  • a drive gear 13 is attached to the axially fixed rotatable sleeve 14 and meshes with a driving gear 41. When a handwheel 12 is manually rotated, these gears advance the support plate 15 which is screwed onto the sleeve 14 and whereby longitudinally displace the control rods 11 attached to the support plate extend into the pistons 5.
  • FIG. 3 An alternate arrangement for the adjustment of the control rods is illustrated in FIG. 3.
  • a sleeve 18 forming the fluid passage of the outlet duct is longitudinally slidable inside the housing 19.
  • Part of spindle 21 extends into a chamber 48- that is connected with the outlet chamber 10' and is provided with external threads onto which is screwed a hexagonal head 24.
  • This hexagonal head cooperates with hexagonal recess 48 preventing rotation of the head and supports the spring 22.
  • the knee-shaped support plate 23, which carrier control rods 11 on its periphery as in FIG. 1, is attached at its hub to sleeve 18 by two circlips 47 that hold it in a perpendicular position relative to the longitudinal axis of the sleeve.
  • a stepped shoulder 49 of the sleeve 18 in the intake chamber 6 decreases one differential-piston area 50 of the sleeve 18 relative to an oppositely effective area 51, both of which are under pressure from the fluid in chamber 10.
  • the sleeve motion constitutes the essential part of a servomechanism in which variations in the pressure of the pump are automatically compensated for by variations in the stroke length of the pistons.
  • An axial-piston pump comprising:
  • housing means having an axis and formed with a plurality of axially extending cylinders angularly spaced about said axis;
  • intake-valve means communicating with said chambers proximal to said other ends of said pistons for delivering fluid to said chambers during an intake stroke of the respective piston enlarging the corresponding chamber;
  • outlet means in said housing means including a respective check valve communicating with each of said chambers proximal to said other ends of said pistons for discharging fluid from said chambers unidirectionally during a compression stroke of the respective piston decreasing the volumes of the corresponding chamber, said pistons being each formed with an axially extending bore opening at said other ends, an aperture at a location intermediate said ends and communicating between said bore and said chamber, and a vent passage opening into said bore proximal to said one end; and
  • control means for establishing effective portions of the compression strokes of said pistons, said control means comprising:
  • An axial piston pump as defined in claim 1 wherein said apertures are generally radial orifices formed in each piston and communicating between the corresponding piston bore and pump chamber, said control rods each having a control edge alternately blocking and unblocking the respective orifice during each piston reciprocation, said pistons and said cylinders each define an axially extending channel along the outer wall of the respective piston communicating between the respective pumping channel and the respective radial orifice.
  • An axial piston pump as defined in claim 2 wherein said mechanism includes an axially fixed spindle rotatably mounted on said housing means remote from said head, and means external of said housing means for rotating said spindle, said body threadedly engaging said spindle and being nonrotatable for axial advance upon rotation of said spindle, said means for rotating said spindle comprising a driven gear connected to said spindle, a driving gear rotatably mounted in said housing means and meshing with said driven gear and a handwheel operable externally of said housing and connected with said driving gear for manually rotating same, said spindle being tubular and centered on said axis while forming said outlet means.
  • said adjusting means includes a differential piston axially shiftable in said housing means and subjected to the fluid pressure at said outlet means for axially displacing said body, said differential piston forming a tube centered on said axis and forming an outlet conduit, said differential piston having a net effective surface area exposed to the pressure at said outlet means tending to advance said control rods into said pistons upon an increase in fluid pressure at said outlet means.
  • control means includes a tubular member coaxial with said shaft and opposite the latter, means enabling displacement of said body axially along said tubular member, means connecting said tubular member with said chambers through said check valves for forming an outlet duct in said tubular member, and an outlet port formed in said housing means and communicating with the interior of said tubular member,

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
US693844A 1967-01-05 1967-12-27 Axial-piston pump with control rods Expired - Lifetime US3496873A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET0032926 1967-01-05

Publications (1)

Publication Number Publication Date
US3496873A true US3496873A (en) 1970-02-24

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Family Applications (1)

Application Number Title Priority Date Filing Date
US693844A Expired - Lifetime US3496873A (en) 1967-01-05 1967-12-27 Axial-piston pump with control rods

Country Status (4)

Country Link
US (1) US3496873A (de)
DE (1) DE1653630B1 (de)
FR (1) FR1551385A (de)
GB (1) GB1172137A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130299182A1 (en) * 2009-12-23 2013-11-14 Bp Corporation North America, Inc. Rigless Low Volume Pump System
WO2016045841A1 (de) * 2014-09-25 2016-03-31 Mahle International Gmbh Pumpvorrichtung, insbesondere axialkolbenpumpe, für eine abwärmenutzungseinrichtung eines kraftfahrzeugs
US20180128239A1 (en) * 2014-09-25 2018-05-10 Mahle International Gmbh Pumping device for a waste heat recovery apparatus in a motor vehicle
US10030490B2 (en) 2014-04-16 2018-07-24 Bp Corporation North America, Inc. Reciprocating pumps for downhole deliquification systems and fluid distribution systems for actuating reciprocating pumps

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1940524A (en) * 1931-01-09 1933-12-19 Bellem Louis Henri Libert Fuel pump
US1943034A (en) * 1930-07-23 1934-01-09 F E Myers & Bro Company Double acting pump cylinder
FR844436A (fr) * 1938-04-02 1939-07-25 Pompe perfectionnée
US2439879A (en) * 1944-12-02 1948-04-20 Allen Ivis James Multicylinder fuel injection pump
US2524235A (en) * 1948-04-27 1950-10-03 Schenk Peter Variable displacement pump
GB646371A (en) * 1946-09-17 1950-11-22 Beacham Hydraulic Company Ltd Improvements in hydraulic pumps
US2821926A (en) * 1954-06-28 1958-02-04 Cessna Aircraft Co Variable volume reciprocating pump
US2839002A (en) * 1954-05-13 1958-06-17 Williams Ernest Pumps
US2981198A (en) * 1958-08-12 1961-04-25 Nettel Frederick Reciprocating variable delivery pump

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1943034A (en) * 1930-07-23 1934-01-09 F E Myers & Bro Company Double acting pump cylinder
US1940524A (en) * 1931-01-09 1933-12-19 Bellem Louis Henri Libert Fuel pump
FR844436A (fr) * 1938-04-02 1939-07-25 Pompe perfectionnée
US2439879A (en) * 1944-12-02 1948-04-20 Allen Ivis James Multicylinder fuel injection pump
GB646371A (en) * 1946-09-17 1950-11-22 Beacham Hydraulic Company Ltd Improvements in hydraulic pumps
US2524235A (en) * 1948-04-27 1950-10-03 Schenk Peter Variable displacement pump
US2839002A (en) * 1954-05-13 1958-06-17 Williams Ernest Pumps
US2821926A (en) * 1954-06-28 1958-02-04 Cessna Aircraft Co Variable volume reciprocating pump
US2981198A (en) * 1958-08-12 1961-04-25 Nettel Frederick Reciprocating variable delivery pump

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130299182A1 (en) * 2009-12-23 2013-11-14 Bp Corporation North America, Inc. Rigless Low Volume Pump System
US8925637B2 (en) * 2009-12-23 2015-01-06 Bp Corporation North America, Inc. Rigless low volume pump system
US9127535B2 (en) 2009-12-23 2015-09-08 Bp Corporation North America Inc. Rigless low volume pump system
US10030490B2 (en) 2014-04-16 2018-07-24 Bp Corporation North America, Inc. Reciprocating pumps for downhole deliquification systems and fluid distribution systems for actuating reciprocating pumps
WO2016045841A1 (de) * 2014-09-25 2016-03-31 Mahle International Gmbh Pumpvorrichtung, insbesondere axialkolbenpumpe, für eine abwärmenutzungseinrichtung eines kraftfahrzeugs
US20180128239A1 (en) * 2014-09-25 2018-05-10 Mahle International Gmbh Pumping device for a waste heat recovery apparatus in a motor vehicle
US10280905B2 (en) 2014-09-25 2019-05-07 Mahle International Gmbh Pumping device for a waste heat recovery apparatus in a motor vehicle

Also Published As

Publication number Publication date
DE1653630B1 (de) 1971-01-28
GB1172137A (en) 1969-11-26
FR1551385A (de) 1968-12-27

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