US3915069A - Axial-flow piston pump with pivotable cylinder drum - Google Patents

Axial-flow piston pump with pivotable cylinder drum Download PDF

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Publication number
US3915069A
US3915069A US538855A US53885575A US3915069A US 3915069 A US3915069 A US 3915069A US 538855 A US538855 A US 538855A US 53885575 A US53885575 A US 53885575A US 3915069 A US3915069 A US 3915069A
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US
United States
Prior art keywords
control
deflector member
housing
control deflector
guide surface
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.)
Expired - Lifetime
Application number
US538855A
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English (en)
Inventor
Ludwig Wagenseil
Horst Deininger
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.)
Hydromatik GmbH
Original Assignee
Hydromatik GmbH
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
Priority claimed from DE19742401331 external-priority patent/DE2401331C2/de
Application filed by Hydromatik GmbH filed Critical Hydromatik GmbH
Application granted granted Critical
Publication of US3915069A publication Critical patent/US3915069A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F04B1/2064—Housings
    • 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
    • F04B1/2042—Valves

Definitions

  • An axial-flow piston pump including a pivotable cylinder drum, and an operatively-coupled drive disc which is fixedly supported within a housing and to which pistons are linked through the intermediary of ball joint linkages, the pistons being movably located within the cylinder bores of the drum; and a control deflector member having control recesses whose outlets face towards the cylinder bores, wherein the control deflector member is pivotable by means of an adjusting installation in response to the vertical stroke of the pump, and wherein the cylindrically-shaped rear surface thereof facing away from the control deflector member is supported on a complementary shaped guide surface of the housing which evidences opening connected with suction or, respectively, pressure passageways for the pressure medium which remain in connection with the control recesses for all inclined positions of the control deflector member.
  • FIGA A first figure.
  • the present invention relates to an axial-flow piston AXIAL-FLOW pump including a pivotable cylinder drum, and an operatively-coupled drive disc which is fixedly sup-' ported within a housing and to which pistons are linked through the intermediary of ball joint linkages, the pistons being movably located within the cylinder bores of the drum; and a control deflector member having control recesses whose outlets face towards the cylinder bores, wherein the control deflector member is pivotable by means of an adjusting installation in response to the vertical stroke of the pump, wherein the cylindrically-shaped rear surface thereof facing away from the control deflector member is supported on a complementary shaped guide surface of the housing which evidences opening connected with suction or, respectively, pressure passageways for' the pressure medium which remains in connection with the control recesses for all inclined positions of the control deflector member.
  • the disadvantage of such a construction consists of in that the flow' through openings between the control deflector member and the guide surface are to small so as to be able to aspirate the pressure medium from a tank under atmospheric pressure without excessive rotational'speed losses when the machine is to be employed as a self-priming pump in an open operating circuit.
  • the flow-through openings thereby cannot be enlarged as desired, since the pressure loads acting on the rear surface of the coritfol deflector member facing towards the guide surface may not become larger than the forces which are exerted by the pistons through the cylinder drum on the control deflector member, in effect meaning, on the front side of the control deflector member.
  • the foregoing object of the invention is solved in a surprisingly simple manner in a pump of the abovementioned type, in which the opening in the guide surface which is connected with the suction passageway is enlarged to such an extent so as to conform to at least surface extension of the associated control recesses, and in all inclined positions of the control deflector member, the projection of the control recesses on the guide surface are fully covered, as well as the housing cavity is continually connected with the suction passageway, in that there remains uncovered a portion of the opening through the control deflector member. Accordingly, by means of inventive solution of the set task, there is no weakening of the control deflector member through otherwise required additional bores in the control deflector member leading to the housing cavity.
  • control recesses maintain their symmetrical positions and are equally large, whereby no undesirable additional pressure or lifting forces will act on the control deflector member.
  • Consideration is given by the invention to the circumstance that, on the suction side the determinative restrictive location forming transition between the suction aperture and the connection to the control recesses in the control deflector body need not be sealed with respect to the inner cavity of the housing.
  • the suction cross-section is practically equal for all inclined positions of the control deflector body since, by means the inventively constructed opening in the guide surface communicating with the suction passageway connected aperture in the guide surface, the position of the control deflector member and thereby the control recesses on the suction side with respect to this opening, are without influence on the suction cross-section.
  • the pressure means inlet may also be directly effected, in a known manner, through a housing cavity (compare with German Published Patent Specification No. 1,653,417).
  • FIG. 1 schematically illustrates a cross-section through an axial-flow piston pump according to the invention taken along pivot plane thereof;
  • FIG. 2 is a part section taken along line l-l in FIG.
  • FIG. 3 is a plan view onto the control deflector surface of the control deflector member.
  • FIG. 4 is a part section taken along line lllI in, respectively, FIGS. 2 and 3.
  • the axial-flow piston pump which is illustrated in FIG. 1 includes a drive shaft 3 which is supported by means of a ball bearing 1 in a housing 2, and which shaft integrally carries a drive plate or disc 4. Supported on the drive plate 4 through the intermediary of ball swivel joints 5 are the piston rods 6 of piston 7. The pistons 7 move within cylinder bores 8 of a cylinder drum 9. The cylinder drum 9 is adapted to be placed into rotation by the drive shaft 3 through the drive plate 4 and the pistons 7. The extent of lifting of the pistons 7 is determined in accordance with the angle of inclination of the cylinder drum axis 10 relative to the rotational axis 11 of the shaft 3.
  • the cylinder drum 9 is centered by means of a centering journal 13, the latter of which is supported by a sphere 12 on the drive plate 4, and is supported, -in the loaded condition of the pump under the effect of the pressure medium forces and in the unloaded condition of the pump under only the force of the pressure spring 14 located between the journal 13 and the cylinder drum 9, -against a control deflector member 15, and which itself is supported on a cylindrically-surface shaped guide surface 16 of the pump housing portion 17.
  • an adjusting trunnion 18 engages the control deflector member 15, which is rigidly connected with an adjusting rod 19, the latter of which is displaceably supported within a bore 20 in the pump housing portion 17.
  • a setting mechanism (not shown) engages the adjusting rod 19, by means of which the adjusting rod 19 may be displaced in a longitudinal direction whereby the trunnion 18 displaces the control deflector member 15 along the cylindrically-shaped guide surface 16 with resultant pivoting of the cylinder drum 9 about the pivot axis 21.
  • inlet and outlet flow passageways 22, 23 which connect the cylinder bores 8 through the openings 24, and the control recesses 25, 2.6 (FIG. 3) formed in the control deflector surface 27 of the control deflector member 15, with the openings 28, 29, of, respectively, the suction passageway 30 and pressure passageway 31 in the guide surface 16.
  • the opening 32 of the passageway 23 has an elongate configuration on the pressure side so that, at each angular position of the control deflector member 15, the opening 29 in the guide surface 16 is covered.
  • the passageway 22 On suction side the passageway 22 has a cross-section which, along its entire length, corresponds to at least the surface extension of the control recesses 25.
  • the opening 28 is constructed so large, as may be ascertained from FIGS. 3 and 4, whereby the projection of the control recesses in the guide surface 16 always lies within the surface extension of the opening 28.
  • the opening 28 with the parts 33, 34 projects outwardly beyond the control deflector member 15, and is not covered by the latter, so as-to form a connection with the housing inner chamber or cavity 35.
  • an axial-flow piston pump having a pivotable cylinder drum having a plurality of cylinder bores; a housing encompassing said cylinder drum; a drive disc fixedly supported in said housing and adapted to be op eratively driven; a plurality of pistons reciprocably mounted in said cylinder bores; ball joint means linking said pistons to said drive disc; a control deflector member having control recesses facing .the outlets of said cylinder bores; and adjusting means for pivoting said control deflector member for determining the lifting setting of said pump; said housing having a guide surface of generally cylindrical configuration supporting the complementary shaped rear surface of said control pivoted positions of said control deflector member fully covering the projection of the control recesses on the guide surface and concurrently continually connect the housing cavity with the suction passageway in that a portion of the opening remains uncovered by said con- .trol deflector member.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Hydraulic Motors (AREA)
US538855A 1974-01-11 1975-01-06 Axial-flow piston pump with pivotable cylinder drum Expired - Lifetime US3915069A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19742401331 DE2401331C2 (de) 1974-01-11 Axialkolbenpumpe mit schwenkbarer Zylindertrommel

Publications (1)

Publication Number Publication Date
US3915069A true US3915069A (en) 1975-10-28

Family

ID=5904637

Family Applications (1)

Application Number Title Priority Date Filing Date
US538855A Expired - Lifetime US3915069A (en) 1974-01-11 1975-01-06 Axial-flow piston pump with pivotable cylinder drum

Country Status (3)

Country Link
US (1) US3915069A (no)
JP (1) JPS553545B2 (no)
FR (1) FR2257797A1 (no)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4007662A (en) * 1975-01-17 1977-02-15 Hydromatik Gmbh Axial piston machine of oblique-axle construction with tiltable cylinder drum
US4198899A (en) * 1976-09-24 1980-04-22 Linde Ag Axial-piston machine of variable output having a slide for displaying the cylinder drum

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56127378U (no) * 1980-02-28 1981-09-28
JPS60105873U (ja) * 1983-12-24 1985-07-19 日立建機株式会社 斜軸式液圧回転機
CN106593536B (zh) * 2015-10-14 2021-08-24 熵零控股股份有限公司 小余隙柱塞流体机构

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3291068A (en) * 1956-05-29 1966-12-13 Reiners Walter Hydraulic axial-piston machine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3291068A (en) * 1956-05-29 1966-12-13 Reiners Walter Hydraulic axial-piston machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4007662A (en) * 1975-01-17 1977-02-15 Hydromatik Gmbh Axial piston machine of oblique-axle construction with tiltable cylinder drum
US4198899A (en) * 1976-09-24 1980-04-22 Linde Ag Axial-piston machine of variable output having a slide for displaying the cylinder drum

Also Published As

Publication number Publication date
FR2257797A1 (no) 1975-08-08
DE2401331B1 (de) 1975-02-20
DE2401331A1 (no) 1975-02-20
JPS50102905A (no) 1975-08-14
JPS553545B2 (no) 1980-01-25

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