US3303749A - Hydraulic motors - Google Patents

Hydraulic motors Download PDF

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Publication number
US3303749A
US3303749A US449185A US44918565A US3303749A US 3303749 A US3303749 A US 3303749A US 449185 A US449185 A US 449185A US 44918565 A US44918565 A US 44918565A US 3303749 A US3303749 A US 3303749A
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US
United States
Prior art keywords
piston
fluid
motor
rotor
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
US449185A
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English (en)
Inventor
Ocule Oreste
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SIMIT SpA
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SIMIT SpA
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Filing date
Publication date
Application filed by SIMIT SpA filed Critical SIMIT SpA
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Publication of US3303749A publication Critical patent/US3303749A/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
    • F03C1/06—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis
    • F03C1/0636—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
    • F03C1/06—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis
    • F03C1/0602—Component parts, details
    • F03C1/0605—Adaptations of pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
    • F03C1/06—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis
    • F03C1/0636—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F03C1/0644—Component parts
    • F03C1/0663—Casings, housings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
    • F03C1/06—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis
    • F03C1/0678—Control

Definitions

  • This invention relates to hydraulic motors having axial free pistons, of the type comprising a rotary block formed with cylindrical recesses extending parallel with the rotational axis of the block.
  • the recesses have pistons slidably mounted therein, which are operated by fluid pressure from a pump and act against a surface inclined to the rotational axis of the block of a swash plate mounted on the stationary motor frame, in order to rotate the latter.
  • Control valves alternately connect each cylinder with the pressure fluid supply pump and exhaust, respectively, dependently upon the angular position cyclically taken by the piston on rotation of the block.
  • each piston in which the fluid pressure acts is connected with a chamber surrounding the rotor and connecting in turn with the fluid reservoir, the communication being established through conduits formed in the piston bottoms, each controlled by a unidirectional valve adapted to automatically close by effect of the fluid acting in the loaded cylinders and open by effect of the vacuum set up in the cylinders when the motor starts being rotated to allow of the fluid at atmospheric pressure to iloW from the reservoir to the axial bore in the pistons and cause the resilient return means acting on the pistons to constantly hold the latter in contact with the swash plate.
  • Reference numerals 1 and 2 denoted the head portions of the motor frame, which are connected by rods 3a to a cylindrical housing 3 and are provided with ball or roller bearings 5, 6 and 7 for guiding a shaft 4 arranged on the motor axis.
  • the shaft 4 carries, such as by means of keys 4a a cylindrical block 8 formed with cylindrical recesses 9 extending parallel with the axis, having slidable therein pistons 10 having their outwardly facing end convex and bearing on a ring 11 guided by means of a ball or roller bearing 12 with respect to an internal surface on the head portion 2, which is inclined to the rotational axis of the block 8.
  • the fluid is discharged through a conduit 16 likewise bored in the head portion 1 connecting through a groove 16a cut in the inner face of the head portion with the other half of the cylindrical recesses 9.
  • the pistons 10 in the recesses connecting with the fluid supply conduit 15 are pressed against the swash plate 11 and act on the rotary block and distributor ring 13 by a tangential thrust which rotates the motor.
  • the pistons 10 are formed with an axial bore 10a opening on the side turned towards the forward head portion 1, accommodating a helical compression spring 18, the opposite ends of which engage two tubular sleeves 19, 20 secured on the cylindrical projection 13a on the ring 13 forming the head portion of the cylinder 9 and to the bottom of the bore 10a in the piston 10, respectively.
  • a chamber 26 formed by the clearance between the rotor 8 and housing 3 surrounds the rotor 8 and connects through a conduit 27 with a reservoir 30 for the fluid at atmospheric pressure.
  • the running motor can be braked by throttling the flow of fluid issuing from the conduit 16 by means of a valve the opening of which is adjustable by the operator.
  • the device is advantageous in use in connection with motors structurally combined with vehicle wheels for braking on down-hill drive; in control of rotation of towers for cranes, excavators and the like, in which the masses of the rotary parts are considerable and are liable to give rise to undesired movements by inertia.
  • a hydraulic motor of the type comprising a tubular body, a rotor rotatably mounted within said body so that a clearance is formed between said body and said rotor,
  • swash plate situated on one side of the rotor sup-V ported by the body, a plurality of cylindrical recesses parallel to the rotational axis in said rotor, fluid inlet and outlet means disposed adjacent the side of said rotor 0pposite said swash plate, a piston freely slidably mounted in each recess, a compression spring mounted in each recess and urging the piston so that its head abuts said swash plate, a valve housing remotefrom said fluid inlet and outlet means, a conduit in continuous communication with said valve housing and with the clearance between the rotor and the body, a one-Way valve opening towards the inside of the recess mounted in each valve housing and a conduit connecting the clearance between the body and the rotor with a reservoir-,containing uid at atmospheric pressure.
  • PAUL E MAsLoUsKY, Examiner.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Hydraulic Motors (AREA)
US449185A 1964-04-24 1965-04-19 Hydraulic motors Expired - Lifetime US3303749A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT950464 1964-04-24

Publications (1)

Publication Number Publication Date
US3303749A true US3303749A (en) 1967-02-14

Family

ID=11131123

Family Applications (1)

Application Number Title Priority Date Filing Date
US449185A Expired - Lifetime US3303749A (en) 1964-04-24 1965-04-19 Hydraulic motors

Country Status (4)

Country Link
US (1) US3303749A (it)
BE (1) BE662991A (it)
CH (1) CH406098A (it)
GB (1) GB1056465A (it)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3429231A (en) * 1966-04-18 1969-02-25 Int Basic Economy Corp Fluid motor
US3611876A (en) * 1969-08-14 1971-10-12 Ferris Q Day Ultra high-pressure compressible fluid motor
US3747474A (en) * 1971-08-23 1973-07-24 Us Navy Controlled acceleration ejector piston
US3807283A (en) * 1970-05-18 1974-04-30 Cessna Aircraft Co Axial piston pump or motor
US3890882A (en) * 1970-08-03 1975-06-24 Wilfred S Bobier Fluid device having plastic housing and means for mounting a cylinder barrel
US4007663A (en) * 1974-02-01 1977-02-15 Mitsubishi Kogyo Kabushiki Kaisha Hydraulic pump of the axial piston type
US4642032A (en) * 1985-08-07 1987-02-10 Teleflex Incorporated Axial piston pump including ball piston
US5354181A (en) * 1992-02-28 1994-10-11 Hydro Rene Leduc Hydraulic piston pumps equipped with suction valve
US5466130A (en) * 1994-07-26 1995-11-14 Kobelt; Jacob Helm pump
DE102012013436A1 (de) * 2012-06-01 2013-12-05 Robert Bosch Gmbh Hydraulische Kolbenmaschine und hydraulische Maschine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2667862A (en) * 1952-04-12 1954-02-02 Jeffrey Mfg Co Variable volume hydraulic motor with pressure responsive volume control
US2980077A (en) * 1959-03-17 1961-04-18 English Electric Co Ltd Hydraulic devices
US3183847A (en) * 1961-12-22 1965-05-18 Hydro Kinetics Inc Variable displacement pump
US3221660A (en) * 1963-08-20 1965-12-07 Amato Michael A D Automatic control for variable displacement pump

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2667862A (en) * 1952-04-12 1954-02-02 Jeffrey Mfg Co Variable volume hydraulic motor with pressure responsive volume control
US2980077A (en) * 1959-03-17 1961-04-18 English Electric Co Ltd Hydraulic devices
US3183847A (en) * 1961-12-22 1965-05-18 Hydro Kinetics Inc Variable displacement pump
US3221660A (en) * 1963-08-20 1965-12-07 Amato Michael A D Automatic control for variable displacement pump

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3429231A (en) * 1966-04-18 1969-02-25 Int Basic Economy Corp Fluid motor
US3611876A (en) * 1969-08-14 1971-10-12 Ferris Q Day Ultra high-pressure compressible fluid motor
US3807283A (en) * 1970-05-18 1974-04-30 Cessna Aircraft Co Axial piston pump or motor
US3890882A (en) * 1970-08-03 1975-06-24 Wilfred S Bobier Fluid device having plastic housing and means for mounting a cylinder barrel
US3747474A (en) * 1971-08-23 1973-07-24 Us Navy Controlled acceleration ejector piston
US4007663A (en) * 1974-02-01 1977-02-15 Mitsubishi Kogyo Kabushiki Kaisha Hydraulic pump of the axial piston type
US4642032A (en) * 1985-08-07 1987-02-10 Teleflex Incorporated Axial piston pump including ball piston
AU571784B2 (en) * 1985-08-07 1988-04-21 Teleflex Inc. Axial piston pump
US5354181A (en) * 1992-02-28 1994-10-11 Hydro Rene Leduc Hydraulic piston pumps equipped with suction valve
US5466130A (en) * 1994-07-26 1995-11-14 Kobelt; Jacob Helm pump
DE102012013436A1 (de) * 2012-06-01 2013-12-05 Robert Bosch Gmbh Hydraulische Kolbenmaschine und hydraulische Maschine

Also Published As

Publication number Publication date
BE662991A (it) 1965-08-17
CH406098A (it) 1966-01-15
GB1056465A (en) 1967-01-25

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