US3744379A - Rotary hydraulic machines - Google Patents

Rotary hydraulic machines Download PDF

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Publication number
US3744379A
US3744379A US00128861A US3744379DA US3744379A US 3744379 A US3744379 A US 3744379A US 00128861 A US00128861 A US 00128861A US 3744379D A US3744379D A US 3744379DA US 3744379 A US3744379 A US 3744379A
Authority
US
United States
Prior art keywords
machine
rotor
piston
cam ring
servo
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
US00128861A
Other languages
English (en)
Inventor
F Freeman
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.)
ZF International UK Ltd
Original Assignee
Lucas Industries Ltd
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 Lucas Industries Ltd filed Critical Lucas Industries Ltd
Application granted granted Critical
Publication of US3744379A publication Critical patent/US3744379A/en
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
    • F01B13/00—Reciprocating-piston machines or engines with rotating cylinders in order to obtain the reciprocating-piston motion
    • F01B13/04—Reciprocating-piston machines or engines with rotating cylinders in order to obtain the reciprocating-piston motion with more than one cylinder
    • F01B13/06—Reciprocating-piston machines or engines with rotating cylinders in order to obtain the reciprocating-piston motion with more than one cylinder in star arrangement
    • F01B13/061—Reciprocating-piston machines or engines with rotating cylinders in order to obtain the reciprocating-piston motion with more than one cylinder in star arrangement the connection of the pistons with the actuated or actuating element being at the outer ends of the 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
    • F04B49/12—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
    • F04B49/123—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 by changing the eccentricity of one element relative to another element
    • F04B49/128—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 by changing the eccentricity of one element relative to another element by changing the eccentricity of the cylinders, e.g. by moving a cylinder block
    • 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
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/06—Control
    • F04B1/07—Control by varying the relative eccentricity between two members, e.g. a cam and a drive shaft

Definitions

  • references Cited the eccentricity of the cam ring can be varied by means UNITED STATES PATENTS of one or more servo pistons.
  • SHEET 3 [IF 3 INVENTOR ATTORNEYS ROTARY HYDRAULIC MACHINES BACKGROUND OF THE INVENTION
  • This invention relates to rotary hydraulic machines such as pumps and motors and has as an object of the provision of such a machine in a convenient form.
  • a rotary hydraulic machine comprises a casing, an internal pintle secured to the casing, a rotor carried on the pintle, a plurality of pistons in radial bores in the rotor, an annular member within the body, the pistons engaging the inner face of said member and a piston responsive to a servo pressure, the servo-responsive piston being slidable within the pintle and co-acting with the annular member to vary the eccentricity thereof with respect to the rotor.
  • FIG. 1 is a section through a pump; and FIGS. 2 and 3 are views taken along 2-2 and 3--3 respectively in FIG. 1.
  • the pump has a casing formed in two parts 10,11 and the part 11 includes an integral stepped pintle 12. Within the pintle 12 are a pair of passages 13,14 which open onto the surface of the pintle 12 to provide ports 15,16 respectively. Mounted on the pintle 12 is a rotor 17 having a plurality of stepped radial bores 18 within each of which a piston 19 is slidable Secured by a stud 20 to each piston 19 is a slipper 21.
  • An annular member or cam ring 22 is carried within the casing 10, 11 and can engage a pin 23 which extends into the casing 10, 11.
  • the member 22 is engageable by a pair of piston elements in the form of balls 24,25 which are slidable in respective bores 26,27 in the pintle 12. Bores 26,27 communicate via respective passages 28,29 with the outside of the casing part 11.
  • a spring 30 engages the ball 24 to bias the annular member 22 in a clockwise direction as shown in FIG. 3 with respect to pin 23.
  • Rotor 17 includes a shaft 31 having a flanged portion 31a secured by dowels 32 to the remainder of the rotor 17.
  • the casing part sealingly supports a bushing 33 on which is mounted a bearing ring 33a. Ring 33a slidably and sealingly engages the flanged portion 31a.
  • Shaft 31 also passes through a bushing 34.
  • a bearing ring 34a is mounted on the bushing 34 and engages a collar 35 sealingly secured to the shaft 31.
  • the bushing 34 is sealingly supported by a disc 36 which is in turn sealingly engaged with the body part 10 so as to define an annular space 37 between the rings 33a, 340.
  • a passage 38 provides a drain for the space 37.
  • a spring washer 39 urges the bushings 33,34 apart andthereby urges the rings 33a,34a into sealing engagement with the flange 31a and collar 35 respectively.
  • a rotary hydraulic manhine comprising a casing, a pintle secured to and extending into the casing, a rotor rotatable about the pintle, a plurality of radial bores in the rotor, pistons reciprocable respectively in the bores, a cam ring within the casing surrounding the rotor and pistons, the pistons engaging the inner face of the cam ring and means for varying the eccentricity of the cam ring with respect to the rotor, said eccentricity varying means including a bore within the pintle, a piston responsive to a servo pressure slidable within the pintle bore and being cooperable with the cam ring to urge the cam ring in one direction to vary the eccentricity thereof with respect to the rotor.
  • each said piston in said radial bores includes a slipper engaging said cam ring.
  • said sealing arrangement comprises a pair of rings mounted on the casing and sealingly engaging said rotor, and means biasing said rings into engagement with said rotor.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Hydraulic Motors (AREA)
US00128861A 1970-04-03 1971-03-29 Rotary hydraulic machines Expired - Lifetime US3744379A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1580870 1970-04-03

Publications (1)

Publication Number Publication Date
US3744379A true US3744379A (en) 1973-07-10

Family

ID=10065859

Family Applications (1)

Application Number Title Priority Date Filing Date
US00128861A Expired - Lifetime US3744379A (en) 1970-04-03 1971-03-29 Rotary hydraulic machines

Country Status (4)

Country Link
US (1) US3744379A (de)
DE (1) DE2116246A1 (de)
FR (1) FR2089102A5 (de)
GB (1) GB1335026A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3835752A (en) * 1972-09-28 1974-09-17 Amata M D Control for ball piston fluid transmission device
US3913456A (en) * 1972-08-08 1975-10-21 Bosch Gmbh Robert Slide block control means for radial piston machines
US4237774A (en) * 1979-07-16 1980-12-09 Caterpillar Tractor Co. Displacement control valving for a radial piston device
US5117634A (en) * 1989-04-03 1992-06-02 Paul Pleiger Maschinenfabrik Gmbh & Co. Kg Apparatus for controlling the operation of hydraulic motors

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1213481B (it) * 1986-08-11 1989-12-20 Riva Calzoni Spa Motore idraulico a propulsori radiali ad elementi tubolari a passaggio completo.

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3913456A (en) * 1972-08-08 1975-10-21 Bosch Gmbh Robert Slide block control means for radial piston machines
US3835752A (en) * 1972-09-28 1974-09-17 Amata M D Control for ball piston fluid transmission device
US4237774A (en) * 1979-07-16 1980-12-09 Caterpillar Tractor Co. Displacement control valving for a radial piston device
WO1981000287A1 (en) * 1979-07-16 1981-02-05 Caterpillar Tractor Co Displacement control valving for a radial piston device
US5117634A (en) * 1989-04-03 1992-06-02 Paul Pleiger Maschinenfabrik Gmbh & Co. Kg Apparatus for controlling the operation of hydraulic motors

Also Published As

Publication number Publication date
FR2089102A5 (de) 1972-01-07
GB1335026A (en) 1973-10-24
DE2116246A1 (de) 1971-10-14

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