US3890885A - Actuators - Google Patents

Actuators Download PDF

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Publication number
US3890885A
US3890885A US380204A US38020473A US3890885A US 3890885 A US3890885 A US 3890885A US 380204 A US380204 A US 380204A US 38020473 A US38020473 A US 38020473A US 3890885 A US3890885 A US 3890885A
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United States
Prior art keywords
piston
portions
shaft
splines
plane
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Expired - Lifetime
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US380204A
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English (en)
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Alan Richard Brine Nash
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Individual
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Individual
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/54—Other sealings for rotating shafts
    • F16J15/545—Other sealings for rotating shafts submitted to unbalanced pressure in circumference; seals for oscillating actuator

Definitions

  • a rotary actuator has a piston comprising a vane-like member made up of a pair of opposed portions of similar form to each other and between which a pivot shaft of the piston is secured. Respective sealing rings extend peripherally around each of said opposed portions to provide a double line of sealing around the piston. Said portions are so shaped that they can be formed in a casting or moulding operation with mounting means for the sealing rings and engagement means for the shaft embodied in them, without the use of core pieces or like additional moulding members".
  • a rotary actuator comprising a piston comprising a substantially planar vane-like member, said piston being assembled from a plurality of parts comprising opposed portions forming said vane-like member, a plane of jointing of each of said opposed portions being substantially coincident with or parallel to a main central plane of the member.
  • said portions of the member are of corresponding shape and abut each other directly, or with the interposition of no more than a very thin element, their plane of jointing being at a main central plane of the piston extending radially from its axis of rotation.
  • each said portion of the piston can advantageously have mounting means at or adjacent the plane of jointing for a peripheral sealing means of the piston that is provided to form a fluidtight seal between the piston and the chamber walls so as to prevent leakage of fluid past the piston.
  • Said sealing means in one preferred arrangement, comprise respective juxtaposed sealing rings, one engaged by each said portion of the vane-like member, and such a pair of sealing rings can be clamped together by said portions.
  • the piston shaft By virtue of the division of the vane-like member into opposed portions, it is possible to form the piston shaft as a separate member clamped between said portions.
  • the shaft can be provided with splines, corrugations or other keying elements engageable with co-acting elements on said portions when the shaft is located between the portions, to prevent relative rotation therebetween.
  • sealing means in the form of a pair of juxtaposed sealing rings is provided, said rings may extend along radially opposite sides of the shaft periphery to form a continuous line of sealing around the piston.
  • each of said opposed piston portions is a casting or moulding incorporating the sealing ring mounting means and/or the shaft-keying coating elements in such a manner that said means and/or elements are formed without the use of moulding cores.
  • FIG. I is a schematic plan view of a rotary actuator, with the casing cover omitted, incorporating a piston according to the invention
  • FIGS. 2 and 3 are side and sectional views of the piston, respectively.
  • FIG. 4 is an axial end view of one of the two cast or moulded portions of the piston vane
  • FIGS. 5 to 7 are illustrations to different scales showing the lip sealing arrangement for the piston of the preceding figures, FIG. 5 illustrating a complete half seal,
  • FIG. 8 illustrates in section a portion of a piston according to the invention having an alternative form of lip sealing arrangement
  • FIGS. 9 and 10 are side views of alternative pistons according to the invention.
  • FIGS. 11 to 12 show two further forms of shaft for a piston according to the invention.
  • a rotary actuator comprising a casing 1 is illustrated with its cover removed to show inside the casing a piston 2 comprising a vane 3 non-rotatably mounted on a shaft 4 that is journalled in the casing by bearing portions 6 to give the shaft an angular stroke of up to some
  • the piston divides the casing interior into two spaces or chambers 10a, 10b isolated from each other by a peripheral lip seal arrangement 12 on the piston.
  • a peripheral lip seal arrangement 12 on the piston.
  • FIGS. 3 and 4 Details of a preferred form of piston according to the invention are shown in FIGS. 3 and 4 from which it can be seen that the vane of the illustrated piston comprises two identical half-members 16, each formed by a metal die-casting or a plastics moulding, having their interface in the radial plane of symmetry of the piston and being secured together by bolts 18.
  • the mould parting line for each casting or moulding can be coincident with shoulder 20 of a peripheral recess 22 receiving a flexible lipseal (to be described below) so that no machining is required to prepare the seal seating.
  • splines 24 in a semi-cylindrical region 26, provided to engage non-rotatably with similar splines on the shaft are disposed only on the bottom or inner portion of said region 26 so that they have no undercutting as regards the mould part forming the region 26 and can be fully formed in the die-casting or moulding process without the use of core pieces and without further finishing being required subsequently.
  • the lip seal arrangement 12 for the piston of the pre ceding figures is illustrated in more detail in FIGS. 5 to 7. It comprises two half-seals 30, placed back to back, each extending uninterruptedly around the peripheral recess 22 of its associated half-member. Each half-seal projects proud of the piston.
  • a metal back-up plate 32 may be clamped between the half-seals and the halfmembers 16 to support each seal against undue distortion.
  • this supporting function it can be exercised by the piston shaft.
  • the halfseal section comprises a bead 42 that seats in a complementary channel 44 in the face of the associated shoulder 20 of its half-member 16 to hold the half-seals positively in position on the piston vane.
  • the section further comprises a wing 36 that projects laterally from the root portion 34 obliquely away from the periphery of the piston and that is arranged to have an interference fit with the casing inside wall surface the position of which relative to the piston is shown by the broken line 38 in FIG. 7.
  • the two half-seals thus provide a double line of sealing and, because of the exposure of the inner face 40 of each wing 36 to the actuator fluid, the pressure of that fluid will tend to reinforce the sealing action.
  • the two half-seals 46 in this instance also provide a double line of sealing.
  • the half-seals are separated by rims 48 on the half-members 16, which can then be die-cast or moulded with the plane of their interface 50 as the parting plane of the dies.
  • the half-seals can be moulded in situ on the half-members or bonded to them to be secured permanently in place. Keying elements may of course be provided to assist in securing the half-seals.
  • the separate piston shaft can take a variety of forms, some examples of which are illustrated in FIGS. 9 to 12.
  • the pistons shown in FIGS. 9 and 10 have their shafts secured to them in slightly modified manners as compared with the assembly shown in FIGS. 2 and 3. In both instances, the diameter of a central splined portion 52a of the shaft is larger than that of the bearing portions 6a to the extent that the roots of the spline are radially spaced outwardly from said portions 6a.
  • one of the securing bolts 18a between the piston half-members also passes through a diametrical bore in the shaft so directly pinning the shaft to the piston.
  • FIG. 11 an arrangement similar to that in FIGS. 2 and 3 is shown with splines 52b formed within the diameter of circular section end bearing portions 6b.
  • FIG. 12 the splines 520 are formed projecting above the bearing portions 6c and with their inside diameter greater than the diameter of the bearing portions.
  • a rotary actuator having a piston comprising a pair of similar opposed portions secured together to form a substantially planar vane-like member and peripheral sealing means extending around said member, a plane ofjointing between said opposed piston portions being substantially coincident with a main central plane of the piston, a tubular recess being formed between said piston portions at one region of the piston, a shaft comprising bearing portions for mounting the piston in a rotary member extending into said tubular recess, and splines being provided on the shaft and on said opposed piston portions for interengagement to prevent rotation between the shaft and the piston portions, the shaft splines being formed by radially outwardly facing surfaces and the piston portion splines being formed by radially inwardly facing portions complementary to the shaft spline surfaces in engagement therewith, the splines on the two piston portions being confined to peripheral regions of the tubular recess remote from the plane of jointing.
  • a piston according to claim 1 wherein said sealing means comprise respective juxtaposed sealing rings, one engaged by each said portion of the vane-like member.
  • each sealing ring has a cross-section comprising a wing portion projecting obliquely away from the periphery of the piston and from the juxtaposed sealing ring whereby the sealing rings provide a double line of sealing around the piston.
  • piston portions are of cast or moulded form and mounting means for the sealing rings are embodied in said portions in the casting or moulding operation.
  • a rotary actuator piston comprising a pair of opposed rigid plane members secured together to form a substantially planar vane, a plane of jointing of each of said plate members being substantially coincident with a main central plane of the vane, a peripheral recess being provided on each of said plate members facing onto said plane of jointing, respective flexible sealing rings being engaged in said peripheral recesses, each sealing ring having a transverse cross-section comprising a first limb seating in the recess and a second limb projecting obliquely from said first limb peripherally outwardly and away from said plane of jointing to project peripherally outwardly of the piston plate members, a shaft being held between said plate members with the shaft axis substantially in said central plane, opposite ends of the shaft projecting from the vane and bearing portions being provided on said projecting ends for mounting the piston in a rotary manner, a series of axially directed splines being provided on the shaft between said projecting ends and a formation of splines being provided on respective opposed regions of the plate members for
  • a rotary actuator having a piston comprising a pair of similar opposed portions secured together to form a substantially planar vane-like member, the joint between said opposed portions being substantially coincident with a main central plane of the piston, a tubular recess being formed between said portions, the axis of said recess lying in said central plane and being laterally offset towards one side edge of the planar member, a shaft comprising bearing portions for mounting the piston in a rotary manner being held in said recess between said opposed portions to project from opposite ends thereof, and peripheral sealing means extending around said vane-like member and the shaft projections form to said shaft splines, said recess splines being confined to portions of the recess surface remote from said central plane.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Actuator (AREA)
US380204A 1972-07-21 1973-07-18 Actuators Expired - Lifetime US3890885A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3436672A GB1443516A (en) 1972-07-21 1972-07-21 Actuators

Publications (1)

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US3890885A true US3890885A (en) 1975-06-24

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US380204A Expired - Lifetime US3890885A (en) 1972-07-21 1973-07-18 Actuators

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US (1) US3890885A (xx)
DE (1) DE2336215A1 (xx)
FR (1) FR2194280A5 (xx)
GB (1) GB1443516A (xx)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4474105A (en) * 1981-02-18 1984-10-02 Eicher Fred C Oscillatory fluid powered motor
US4611530A (en) * 1983-08-31 1986-09-16 Kurt Stoll Oscillating piston motor
US5125632A (en) * 1991-01-29 1992-06-30 John A. Blatt Rotary actuated workpiece holder
US20060266212A1 (en) * 2003-01-27 2006-11-30 Andre Paunet Rotating actuator
US20120137873A1 (en) * 2010-12-01 2012-06-07 Roger Charles Chapman Rotary Vane Actuators
US20170022812A1 (en) * 2015-07-21 2017-01-26 Pei Chen Lu Rotor of a rotary cylinder

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4437135C2 (de) * 1994-10-18 1998-02-12 Hydraulik Techniek Emmen Bv Drehflügelschwenkmotor für begrenzte Drehbewegungen
GB2337087B (en) * 1998-02-21 2002-08-07 Mervyn Davies A one stroke engine.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2951470A (en) * 1957-10-15 1960-09-06 Richard E Self Oscillating actuator
US2975763A (en) * 1958-01-06 1961-03-21 Ford Motor Co Vacuum servo system
US2994446A (en) * 1959-05-11 1961-08-01 Deere & Co Earth moving equipment
US3103281A (en) * 1961-02-03 1963-09-10 Houdaille Industries Inc Rotary actuator unit mount for booms and the like
US3359870A (en) * 1965-09-02 1967-12-26 Ashtabula Bow Socket Company Oscillating hydraulic actuator and circuit therefor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2951470A (en) * 1957-10-15 1960-09-06 Richard E Self Oscillating actuator
US2975763A (en) * 1958-01-06 1961-03-21 Ford Motor Co Vacuum servo system
US2994446A (en) * 1959-05-11 1961-08-01 Deere & Co Earth moving equipment
US3103281A (en) * 1961-02-03 1963-09-10 Houdaille Industries Inc Rotary actuator unit mount for booms and the like
US3359870A (en) * 1965-09-02 1967-12-26 Ashtabula Bow Socket Company Oscillating hydraulic actuator and circuit therefor

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4474105A (en) * 1981-02-18 1984-10-02 Eicher Fred C Oscillatory fluid powered motor
US4611530A (en) * 1983-08-31 1986-09-16 Kurt Stoll Oscillating piston motor
US5125632A (en) * 1991-01-29 1992-06-30 John A. Blatt Rotary actuated workpiece holder
US20060266212A1 (en) * 2003-01-27 2006-11-30 Andre Paunet Rotating actuator
US20120137873A1 (en) * 2010-12-01 2012-06-07 Roger Charles Chapman Rotary Vane Actuators
US9085978B2 (en) * 2010-12-01 2015-07-21 Kinetrol Limited Rotary vane actuators
US20170022812A1 (en) * 2015-07-21 2017-01-26 Pei Chen Lu Rotor of a rotary cylinder
US9995142B2 (en) * 2015-07-21 2018-06-12 Pei Chun Lu Rotor of a rotary cylinder

Also Published As

Publication number Publication date
FR2194280A5 (xx) 1974-02-22
GB1443516A (en) 1976-07-21
DE2336215A1 (de) 1974-01-31

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