US3547004A - Fluid pressure actuated motors - Google Patents

Fluid pressure actuated motors Download PDF

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Publication number
US3547004A
US3547004A US780415A US3547004DA US3547004A US 3547004 A US3547004 A US 3547004A US 780415 A US780415 A US 780415A US 3547004D A US3547004D A US 3547004DA US 3547004 A US3547004 A US 3547004A
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US
United States
Prior art keywords
piston
cylinder
fluid pressure
motor
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
US780415A
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English (en)
Inventor
Richard Thomas Fowler
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Girling Ltd
Original Assignee
Girling Ltd
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Filing date
Publication date
Application filed by Girling Ltd filed Critical Girling Ltd
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Publication of US3547004A publication Critical patent/US3547004A/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
    • F15B11/036—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of servomotors having a plurality of working chambers
    • F15B11/0365—Tandem constructions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/10—Characterised by the construction of the motor unit the motor being of diaphragm type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S148/00—Metal treatment
    • Y10S148/006—Apparatus

Definitions

  • each piston is formed as a metal pressing and including an annular skirt which throughout the working stroke of the piston is in engagement with a stationary seal carried by the wall of the cylinder in which that piston works; each piston is of dished form towards one end of its cylinder and the wall at that end of the cylinder is complementarily shaped; the opposite end wall of one cylinder provides an abutment for a coil compression spring which bears against the piston in that cylinder and is accommodated within the dished recess of the piston.
  • a motor of this type has the-advantage over'a conventional single piston motor that the overall diameter-can be considerably reduced for a given output at a given applied'fluid pressure.
  • the cylinder space in which one piston of subtle motorworks'overlaps axially with the cylinder, space in which an-adjacent piston works thus allowing thexoverall axial length-of the motor to be tion one (at least) o f the' pistons is formed as'a metal pressing and includes a peripheral skirt which throughout the working stroke'of the pistonisin'engagerrien't with astationary seal 'ca'rried by'the wall of the cylinder in which that.pis'ton works, this skirt (when thepji'stonis atone end of its stroke) surrounding jacent piston works;
  • FIG. l is an'axial cross section of a motor in accordance with the invention, an a FIG, 2 l a scrap cross sectiontak'en. in another axial plane to illustrate'a detail.
  • the inotor'uriiti comprises a generally cylindrical, open "ended body' portion 10, having a central-dividing wall 12 which, together with'a pair of cylinder 'end closures l4 and 16, forms a forward andfarear motor compartmentor cylinder space.
  • .A 'pairoffpresse'd ,jsteel pistons 18 and are located one in'each of the motor compartments to divide the compartments into atmospheric chambers 2 2 'alncl 24 in frontof'the respective,pistonsfandpressure chambers and 28 to the 1 rear of the re pective pistons.
  • the dividingwallilZ' has a central. aperture 23'which sealingly and slidably" receives the forward end of a stem, 29 forming part ofa pressure member ',whic'h is housed within the chamber 24' and has. an nlargeddi'sc-shaped rear end portion 32,;which is in abutting engagementwith'the piston 20.
  • a thtust'pad-Jd' is welded to the back face of'fthje 'piston' ls and is provided with eompleinentary abutment surfacesfor the partthe piston 20, and the'dividing wall'lZhas a peripheral skirt 64, the interior surface 68 of which forms the forward'part of the rear cylinder space.
  • the outersurface'of the skirt 64 is spaced from the interior surface 66 of-the forward pressure chamber 26, sufficiently to facilitate machining of the surface 66 and to receive'a rearwardly extending's'kirt on the'forward piston v18..
  • the pistons l8 and 20 are? Sealed by respective piston seals 70 and 72 mounted in the l0.
  • Bothpistons; l8 and 20 are formed asmetal pressings which.
  • the piston returnspring 52 is located within the dished part of piston 18, so that when the piston is fully forward, the spring is accommodated wholly within the piston 18 and does not interfere with the 'workingstr'oke of the piston
  • the rear walls 12 and 16 of the 'pres'sure'chambers 26-and 28 are shaped to conform substantially tothe adjacent pistons,
  • the delivery of pressuriz'edt'luid such as compressed air to the chambers 26'and 28 produces a pressure difference across the pistons 18 and 20, which rnove in opposition to the retumspring 52 and displace the' push rod 42 outwardly throughthe end'closure14,.during-which stage air in the chambers 22 and 24 is exhausted to atmosphere through the opening 40 and ports 60 and 61 respectively.
  • the push rod (which may, for examplebe connected. to-a'. brake-applying mechanism) transmits a force which is equal to the sum of the force outputs of the two pistons.
  • the end wall l4 hasacen tral aperture 4ll'which receives with substantial clearance a push rod .42, whose rear end rests in a spherical seatingbn a force transmitting element 44, to i which his connected by apin 46 passing through a diametrical hole 48 adjacent the push rod end.
  • the element 44 includes an enlarged disc-shaped rear end portion 50 which abuts the l piston 18.
  • a piston return coil spring 52 which is located between the end closure 14 and the element 44,'acts tokurge the piston- 18 against theabutment 38 and the piston 20 against a rubber or like buffer 54, on thefront face of th'e'end closure 16.
  • motor is adapted for-attachment, e.gL tea-vehicle frame, by a set of l'tlOlllltlllgbQltSjS carried by the end closure 14. r
  • the motor unit may advantageously befuseld in conjunction with a dual 'brakesystem in which:theiinletsjfiand 58 are "each connected to separate pressure sources such that failure of one source of supply will not cause aeom'plete failure.
  • the forward piston 18 can move forwardly on itsown, leaving the rear-piston behind (since the pistons make abutting engagement only and are not secured to each other); if the supply to theforward cylinder fails, the rear piston can move forwardly,'pushi ng the forward piston ahead of it.
  • the motor has been described as being operated by superatmosphericair pressure, but could obviouslybemodified so as to be vacuum operated(either'air or; vacuum suspended) or hydraulically operated.
  • a motor in accordancewith the inven--x tion could also be used in conjunction with arrangements other than braking systems.
  • a fluid pressure motor comprising a'body defining first and second coaxial cylinder spacess'eparated, from one chamber 26 by way of aradial port 57 in :the body-portion l0,
  • a fluid pressure motor as defined-in claim 1 in which at least one piston' is formed as a metal pressing which is dished, one end wall of the cylinder space in which that piston works being complementarily shaped so as to reduce as far as possible the minimum volume of the chamber formed between the piston and that end wall.
US780415A 1967-12-22 1968-12-02 Fluid pressure actuated motors Expired - Lifetime US3547004A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB58495/67A GB1223568A (en) 1967-12-22 1967-12-22 Improvements in or relating to fluid pressure actuated motors

Publications (1)

Publication Number Publication Date
US3547004A true US3547004A (en) 1970-12-15

Family

ID=10481766

Family Applications (1)

Application Number Title Priority Date Filing Date
US780415A Expired - Lifetime US3547004A (en) 1967-12-22 1968-12-02 Fluid pressure actuated motors

Country Status (5)

Country Link
US (1) US3547004A (fr)
JP (1) JPS4949334B1 (fr)
DE (1) DE1812699A1 (fr)
FR (1) FR1602570A (fr)
GB (1) GB1223568A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3926094A (en) * 1973-07-02 1975-12-16 Midland Ross Corp Air operated spring brake
EP2420348A1 (fr) * 2010-08-18 2012-02-22 Michel Pioch (Société à Responsabilité Limitée) Dispositif d'actionnement linéaire à vérins multiples et procédé de contrôle d'un tel dispositif
US20140260949A1 (en) * 2013-03-15 2014-09-18 Tse Brakes, Inc. Double service chamber pneumatic actuator

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5330090U (fr) * 1976-08-21 1978-03-15
JPS5987360U (ja) * 1982-12-03 1984-06-13 アイシン精機株式会社 タンデム型ブレ−キ倍力装置
GB8513553D0 (en) * 1985-05-29 1985-07-03 Davy Mckee Poole Hydraulic ram assembly
JPS6269636U (fr) * 1985-10-22 1987-05-01
JP4495633B2 (ja) * 2005-04-05 2010-07-07 日信工業株式会社 車両用ディスクブレーキ

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3926094A (en) * 1973-07-02 1975-12-16 Midland Ross Corp Air operated spring brake
EP2420348A1 (fr) * 2010-08-18 2012-02-22 Michel Pioch (Société à Responsabilité Limitée) Dispositif d'actionnement linéaire à vérins multiples et procédé de contrôle d'un tel dispositif
US20140260949A1 (en) * 2013-03-15 2014-09-18 Tse Brakes, Inc. Double service chamber pneumatic actuator

Also Published As

Publication number Publication date
DE1812699A1 (de) 1969-07-03
GB1223568A (en) 1971-02-24
JPS4949334B1 (fr) 1974-12-26
FR1602570A (fr) 1970-12-28

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