US3693508A - Power transmission - Google Patents

Power transmission Download PDF

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Publication number
US3693508A
US3693508A US101647A US3693508DA US3693508A US 3693508 A US3693508 A US 3693508A US 101647 A US101647 A US 101647A US 3693508D A US3693508D A US 3693508DA US 3693508 A US3693508 A US 3693508A
Authority
US
United States
Prior art keywords
cylinder barrel
valve plate
casing
motor
pump
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
US101647A
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English (en)
Inventor
Edward J Chondzinski
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 US3693508A publication Critical patent/US3693508A/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

  • the present invention is based upon the discovery that the body of liquid withinthe casing of the unit, which is carried around by frictional drag with the cylinder barrel and the projecting pistons, exerts a laterally unbalanced pressure force acting to tip the cylinder barrel away from the valve plate and that this force can be eliminated by properly shaping the interior surface of the casing of the unit to minimize the pressure forces which this circulating fluid exerts on the cylinder barrel.
  • a hydraulic pump or motor of the swash plate type which has 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 by the provision of that improvement which includes a casing having a non-concentric inner contour surrounding the cylinder barrel which is shaped to control the circulation of fluid carried around by the drag of the cylinder barrel for preventing the generation of laterally unbalanced pressure forces on the barrel.
  • 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 fragmentary sectional view taken along line 2--2 of FIG. 1.
  • FIG. 3 is a diagrammatic view illustrating some of the forces acting on the cylinder barrel.
  • FIG. 4 is a diagrammatic view illustrating the fluid flows within the casing.
  • a typical axial piston pump or motor unit has a casing and a valve plate 12 within which a drive shaft 14 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 as a force additional to the hydraulic force generated within the shouldered ends of the cylinder bores 30.
  • FIG. 3 illustrates diagrammatically, in exaggerated form, the couples acting upon the cylinder barrel which either assist or oppose its tendency to find a seat flat against the valve plate in its freedom to move about the center A of the spline 34.
  • the moment generated by centrifugal force acting on the pistons with their varying degrees of projection is represented by the couple B.
  • This couple tends to lift the cylinder barrel off from the valve plate as it may pivot about the center A.
  • Couple C generated by the spring 36.
  • These couples may be readily calculated and the force of spring 36 so chosen as to hold the cylinder barrel in contact with the valve plate up to any desired maximum speed. It has been found in practice, however, that particularly at the higher speeds a much stronger spring than the one calculated to be necessary must be used if the cylinder barrel is to be maintained from tipping. It is, of course, undesirable to use high hold-down pressures either from the spring or from the hydraulic forces within the cylinders 30 if undesirable friction and wear are to be avoided at the valving surfaces.
  • the present invention provides an interior configuration which controls the flow of the circulating liquid.
  • these include a pair of baffles 38 on the interior surface of the casing 10 which act to block a major portion, at least, of the liquid which tends to circulate around the interior of the casing by being dragged along with the rotary cylinder barrel and its projecting pistons.
  • These baffles are preferably two in number and are located circumferentially of the device at the points where the pistons are in the mid point of their stroke, that is to say, on the mid plane of the device, as illustrated in FIG. 1.
  • These baffles may take any particular form, either being cast integrally with the interior surface of the casing 10 or inserted as separate elements 38, such as illustrated in FIGS.
  • the clearance between the cylinder barrel 32 and the baffles 38 is preferred to keep the clearance between the cylinder barrel 32 and the baffles 38 as small as reasonably possible and to thus interrupt or at least drastically restrict any circulation of the fluid contained within the casing 10.
  • the force G as seen in FIG. 3, which is exerted by the static component of the total fluid pressure, may be made very nearly equal to the force F exerted on the opposite side of the cylinder barrel 32.
  • the very limited arc over which the baffles extend avoids the creation of significant fluid shear forces at the close clearance with the barrel.
  • the velocity of the fluid which circulates with the cylinder barrel in a-conventional device is plotted at H and I.
  • the velocity across the cross-section of fluid is represented by the area H which has only a low maximum velocity.
  • the maximum velocity is very high.
  • a hydraulic pump or motor of the type having a swash plate, 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 a nonconcentric inner contour surrounding the cylinder barrel which is shaped to control the circulation of fluid carried around by the drag of the cylinder barrel for preventing the generation of laterally unbalanced pressure forces on the cylinder barrel.
  • 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 adjacent the valve plate, that improvement which includes a casing having an internal configuration adjacent the cylinder barrel which is baffled to interrupt the circulation of fluid around the cylinder barrel between the valve plate and the swash plate.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Hydraulic Motors (AREA)
US101647A 1970-12-28 1970-12-28 Power transmission Expired - Lifetime US3693508A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US10164770A 1970-12-28 1970-12-28

Publications (1)

Publication Number Publication Date
US3693508A true US3693508A (en) 1972-09-26

Family

ID=22285720

Family Applications (1)

Application Number Title Priority Date Filing Date
US101647A Expired - Lifetime US3693508A (en) 1970-12-28 1970-12-28 Power transmission

Country Status (8)

Country Link
US (1) US3693508A (it)
JP (1) JPS567060B1 (it)
CA (1) CA945814A (it)
DE (1) DE2163442C3 (it)
FR (1) FR2120905A5 (it)
GB (1) GB1356349A (it)
IT (1) IT939618B (it)
SE (1) SE378648B (it)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3955475A (en) * 1974-10-04 1976-05-11 Daikin Kogyo Co., Ltd. Axial piston power transmission
US4014250A (en) * 1971-04-05 1977-03-29 Robert Bosch G.M.B.H. Cylinder block positioning arrangement for a hydraulic axial piston machine
US4520712A (en) * 1982-09-10 1985-06-04 Hermann Hemscheidt Maschinenfabrik Gmbh & Co. Axial piston machine having a sealed bearing box
US5681149A (en) * 1995-07-19 1997-10-28 Trinova Corporation Hydraulic pump with side discharge valve plate
US5784949A (en) * 1997-06-25 1998-07-28 Sauer Inc. Retaining system for slipper holddown pins
US10487826B2 (en) * 2014-06-30 2019-11-26 Danfoss Power Solutions GmbH & Co., OHG Integrated lubrication pump

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013221623A1 (de) * 2013-10-24 2015-04-30 Robert Bosch Gmbh Axialkolbenmaschine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2177008A (en) * 1937-07-23 1939-10-24 Ex Cell O Corp Hydraulic motor
FR956824A (it) * 1950-02-08
US3382793A (en) * 1965-08-09 1968-05-14 Sundstrand Corp Axial piston hydraulic unit
US3601012A (en) * 1968-05-24 1971-08-24 Harold George Oram Fluid pressure devices

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR956824A (it) * 1950-02-08
US2177008A (en) * 1937-07-23 1939-10-24 Ex Cell O Corp Hydraulic motor
US3382793A (en) * 1965-08-09 1968-05-14 Sundstrand Corp Axial piston hydraulic unit
US3601012A (en) * 1968-05-24 1971-08-24 Harold George Oram Fluid pressure devices

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4014250A (en) * 1971-04-05 1977-03-29 Robert Bosch G.M.B.H. Cylinder block positioning arrangement for a hydraulic axial piston machine
US3955475A (en) * 1974-10-04 1976-05-11 Daikin Kogyo Co., Ltd. Axial piston power transmission
US4520712A (en) * 1982-09-10 1985-06-04 Hermann Hemscheidt Maschinenfabrik Gmbh & Co. Axial piston machine having a sealed bearing box
US5681149A (en) * 1995-07-19 1997-10-28 Trinova Corporation Hydraulic pump with side discharge valve plate
US5784949A (en) * 1997-06-25 1998-07-28 Sauer Inc. Retaining system for slipper holddown pins
US10487826B2 (en) * 2014-06-30 2019-11-26 Danfoss Power Solutions GmbH & Co., OHG Integrated lubrication pump

Also Published As

Publication number Publication date
CA945814A (en) 1974-04-23
DE2163442A1 (de) 1972-07-13
FR2120905A5 (it) 1972-08-18
DE2163442B2 (de) 1973-08-02
JPS567060B1 (it) 1981-02-16
GB1356349A (en) 1974-06-12
AU3432671A (en) 1973-04-12
DE2163442C3 (de) 1974-02-28
IT939618B (it) 1973-02-10
SE378648B (it) 1975-09-08

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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