US3698286A - Power transmission - Google Patents

Power transmission Download PDF

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Publication number
US3698286A
US3698286A US157511A US3698286DA US3698286A US 3698286 A US3698286 A US 3698286A US 157511 A US157511 A US 157511A US 3698286D A US3698286D A US 3698286DA US 3698286 A US3698286 A US 3698286A
Authority
US
United States
Prior art keywords
cylinder barrel
valve plate
fluid
pump
pistons
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
US157511A
Other languages
English (en)
Inventor
Gaylord O Ellis
John A Halat
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.)
Vickers Inc
Original Assignee
Sperry Rand Corp
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 Sperry Rand Corp filed Critical Sperry Rand Corp
Application granted granted Critical
Publication of US3698286A publication Critical patent/US3698286A/en
Assigned to SPERRY CORPORATION reassignment SPERRY CORPORATION CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: SPERRY RAND CORPORATION
Assigned to VICKERS, INCORPORATED reassignment VICKERS, INCORPORATED ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SPERRY CORPORATION A DE CORP.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B3/00—Reciprocating-piston machines or engines with cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F01B3/0032—Reciprocating-piston machines or engines with cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F01B3/0044—Component parts, details, e.g. valves, sealings, lubrication
    • F01B3/0064—Machine housing
    • F01B3/0067—Machine housing cylinder barrel bearing means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B3/00—Reciprocating-piston machines or engines with cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F01B3/0032—Reciprocating-piston machines or engines with cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F01B3/0044—Component parts, details, e.g. valves, sealings, lubrication
    • F01B3/0064—Machine housing

Definitions

  • ABSTRACT A hydraulic pump or motor of the axial piston type [21] Appl 157511 having a cylinder barrel rotating against a fixed valve plate perpendicular to the shaft and free to find its 52 us. c1 ..91/486, 417/201 Own seat against the valve Plate has an improved we 511 1111.
  • the present invention aims to further improve the performance of axial piston pump or motor units by so directing the circulating fluid in the casing of the unit as to produce fluid pressure forces acting on the cylinder barrel in opposite directions and of substantially equal magnitude, thus substantially eliminating tipping forces on the cylinder barrel resulting from hydrostatic pressure of the circulating fluid.
  • FIG. 1 is a longitudinal cross section of a piston pump or motor unit incorporating a preferred form of the present invention.
  • FIG. 2 is a sectional view taken along line 2-2 of FIG. 1.
  • FIG. 3 is a diagrammatic view illustrating the principal forces acting on the cylinder barrel.
  • a typical axial piston pump or motor unit has a casing and a valve plate 12 within which a drive shaft 1'4 is journalled on bearings 16 and 18.
  • Inlet and outlet connections 20 are provided in the valve plate 12 which lead to the usual arcuate commutating ports in the flat surface 22 of the valve plate 12.
  • the casing 10 includes a fixed swash plate 24 around which piston shoes 26 slide, carrying the pistons 28 which project from their respective cylinder bores 30 in a revolving cylinder barrel 32.
  • the barrel 32 is connected to the shaft 14 by a spline 34 which allows a slight amount of universal action which permits the barrel 32 to find its own seat against the flat valving surface 22 of the valve plate 12.
  • a spring 36 acts to hold the cylinder barrel in contact with the valve plate with a force additional to the hydraulic force generated within the shouldered ends of the cylinder bores 30.
  • a baffle 38 of circular form and having a very small clearance with the cylinder barrel is provided.
  • the fluid circulates rapidly at the top of the Figure and slowly at the bottom; while on the leftlhand side of the baffle 38, the relative velocities of the circulating fluid are just the opposite.
  • the degree of eccentricity of the interior wall of the casing may then be made just sufficient so that the couple produced by the algebraic sum of the forces F and G will be substantially equal and opposite to that produced by the sum of forces H and I.
  • this may be determined by a trial and error approach. It has been found, for example, that a typical conventional hydraulic motor unit would experience cylinder barrel tipping at speeds in the neighborhood of 3,500 rpm. A unit of the same design, except incorporating the present invention, was found to operate without tipping at speeds above 4,500 rpm.
  • a hydraulic pump or motor of the swash plate type having a revolving cylinder barrel carrying axial pistons which transmit the driving torque as cantilevers and having a drive shaft and a valve plate perpendicular thereto, with the cylinder barrel connected to the shaft with freedom to find its seat against the valve plate, that improvement which includes a casing having an interior configuration surrounding the cylinder barrel which is eccentric in relation to the cylinder barrel and provides a narrower clearance for fluid circulation at the region of maximum piston extension than the clearance at the region of minimum piston extension.
  • a pump or motor unit as defined in claim 1 having a barrier of concentric circular configuration closely spaced from the cylinder barrel at a substantial distance from the valve plate.
  • a pump or motor unit as defined in claim 1 having a barrier separating the fluid which circulates by frictional drag of the cylinder barrel from that which circulates with the projecting pistons.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Hydraulic Motors (AREA)
US157511A 1971-06-28 1971-06-28 Power transmission Expired - Lifetime US3698286A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US15751171A 1971-06-28 1971-06-28

Publications (1)

Publication Number Publication Date
US3698286A true US3698286A (en) 1972-10-17

Family

ID=22564052

Family Applications (1)

Application Number Title Priority Date Filing Date
US157511A Expired - Lifetime US3698286A (en) 1971-06-28 1971-06-28 Power transmission

Country Status (9)

Country Link
US (1) US3698286A (xx)
JP (1) JPS5323530B1 (xx)
AU (1) AU460768B2 (xx)
CA (1) CA959340A (xx)
DE (1) DE2228884C3 (xx)
FR (1) FR2144257A5 (xx)
GB (1) GB1356350A (xx)
IT (1) IT960273B (xx)
SE (1) SE378649B (xx)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5501578A (en) * 1992-08-14 1996-03-26 Sauer Inc. Hydrostatic axial piston pump with three bearing arrangement
US6568311B2 (en) * 2000-08-03 2003-05-27 Sauer-Danfoss, Inc. Hydraulic motor with shift transmission
US20060029510A1 (en) * 2003-11-27 2006-02-09 Katsutoshi Shiromaru Motor-driven Roots compressor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59153419A (ja) * 1983-02-16 1984-09-01 三菱電機株式会社 比率差動継電装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS449245Y1 (xx) * 1967-06-26 1969-04-15

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5501578A (en) * 1992-08-14 1996-03-26 Sauer Inc. Hydrostatic axial piston pump with three bearing arrangement
US6568311B2 (en) * 2000-08-03 2003-05-27 Sauer-Danfoss, Inc. Hydraulic motor with shift transmission
US20060029510A1 (en) * 2003-11-27 2006-02-09 Katsutoshi Shiromaru Motor-driven Roots compressor

Also Published As

Publication number Publication date
CA959340A (en) 1974-12-17
SE378649B (xx) 1975-09-08
FR2144257A5 (xx) 1973-02-09
GB1356350A (en) 1974-06-12
DE2228884B2 (de) 1973-10-04
IT960273B (it) 1973-11-20
DE2228884A1 (de) 1973-01-18
DE2228884C3 (de) 1978-06-22
AU460768B2 (en) 1975-04-18
JPS5323530B1 (xx) 1978-07-15
AU4105472A (en) 1973-10-18

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Legal Events

Date Code Title Description
AS Assignment

Owner name: SPERRY CORPORATION

Free format text: CHANGE OF NAME;ASSIGNOR:SPERRY RAND CORPORATION;REEL/FRAME:003794/0122

Effective date: 19790824

AS Assignment

Owner name: VICKERS, INCORPORATED TROY, MI A DE CORP

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. EFFECTIVE NOVEMBER 2, 1983;ASSIGNOR:SPERRY CORPORATION A DE CORP.;REEL/FRAME:004337/0889

Effective date: 19831102

Owner name: VICKERS, INCORPORATED,MICHIGAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SPERRY CORPORATION A DE CORP.;REEL/FRAME:004337/0889

Effective date: 19831102