EP0034069A1 - Drehantrieb - Google Patents

Drehantrieb Download PDF

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Publication number
EP0034069A1
EP0034069A1 EP81300561A EP81300561A EP0034069A1 EP 0034069 A1 EP0034069 A1 EP 0034069A1 EP 81300561 A EP81300561 A EP 81300561A EP 81300561 A EP81300561 A EP 81300561A EP 0034069 A1 EP0034069 A1 EP 0034069A1
Authority
EP
European Patent Office
Prior art keywords
shoe
aperture
rotation
working fluid
spindle
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.)
Withdrawn
Application number
EP81300561A
Other languages
English (en)
French (fr)
Inventor
Jorgen Söndergaard
Arne Lykke Nielsen
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.)
Superfos Hydraulic AS
Original Assignee
Superfos Hydraulic AS
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 Superfos Hydraulic AS filed Critical Superfos Hydraulic AS
Publication of EP0034069A1 publication Critical patent/EP0034069A1/de
Withdrawn legal-status Critical Current

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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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/02—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member
    • F15B15/06—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement
    • F15B15/068—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement the motor being of the helical type
    • 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
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
    • F15B15/225—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke with valve stems operated by contact with the piston end face or with the cylinder wall

Definitions

  • the present invention relates to a rotary actuator comprising two relatively rotatable and axially fixed main parts defining between them at least one working chamber with an aperture provided in a surface of one of said main parts of the actuator for inflow and outflow of a working fluid to and from said working chamber, and means for throttling the outflow of working fluid when said main parts assume at least one predetermined relative angular position.
  • main parts may, for example, be a cylinder casing and a spindle coupled together by means of a threaded sleeve located between two pistons which are axially displaceable along the spindle and each of which defines, together with an end wall of the casing, a working chamber between the casing end in question and the threaded sleeve.
  • a pressurized working fluid liquid or gas
  • the piston associated with the first mentioned working chamber moves away from the casing end wall taking the sleeve with it.
  • the axial movement of the sleeve is transformed into a relative rotation between .the spindle and the casing.
  • a rotary actuator When a rotary actuator is employed for moving massive objects, e.g. for effecting the slewing of the jib of an excavator, it is desirable that the rotary movement is automatically retarded or dampened when the moving object approaches one or more predetermined angular positions, in particular one of the extremities of the movement, since otherwise the substantial inertia forces can give rise to serious damage.
  • the or each throttling means consists of a plunger which is slidable in a bore in the stator of the actuator.
  • the bore intersects a duct for the inflow and outflow of the working fluid and the plunger is spring biased radially inward against a cam secured to the rotor of the actuator.
  • the plunger In the -peripheral surface of the plunger there is a narrow annular groove and when the plunger is displaced outwardly by the cam, the fluid duct is partially obstructed by the plunger whereby the working fluid has to flow through the narrow groove.so that the flow is throttled.
  • the prior art actuator comprises, associated with each throttling plunger, a system of by-pass ducts including a spring loaded non-return valve which prevents the outflow of fluid from the working chamber, but permits inflowing working fluid to by-pass the throttling plunger and, thus, avoid the.throttling action thereof.
  • a rotary actuator of the kind initially referred to which is characterized in that the or each throttling means is constituted by at least one shoe which is mounted on the other of said main parts of the actuator for movement towards and away from the surface wherein said aperture is provided, and spring biased to effect abutment between a surface on the shoe and said first mentioned surface, which shoe, by overlapping said aperture, forms a restricted passage for the outflow of the working fluid through the aperture.
  • the shoe rotates correspondingly relative to the aperture through which the working fluid flows, and as long as the shoe is angularly spaced from the aperture, the fluid flow is unimpeded thereby.
  • the abutment surface on the shoe begins to overlap the aperture through which the outflow of fluid occurs, the fluid has to flow through the restricted passage and the resulting throttling of the flow retards the rotary movement.
  • the throttling causes an increase of the pressure prevailing in the working chamber and, hence, an additional force acting on the shoe to ensure its abutment against the surface surrounding the outflow aperture.
  • the restricted flow passage is provided by a groove extending tangentially of the abutment surface on the shoe while the remainder of the abutment surface is shaped complementary to the opposed surface in which the throughflow aperture is provided.
  • the cross-sectional area of the groove may decrease inwardly from the leading edge of the abutment surface on the shoe so that the throttling effect increases gradually when the abutment surface on the shoe moves across the aperture.
  • the rotary actuator illustrated in Figs. 1-3 comprises a casing consisting of a centre part 2 and two cylinders 3 with flanges which are clamped to opposite sides of centre part 2 by means of through bolts 4.
  • Each cylinder includes an end part 5 and a spindle 6 is supported for rotation in-the end parts 5 and axially fixed relative to the casing.
  • a key 7 in a protruding spindle end the spindle can be connected to one of two component parts (not shown) which are adapted to be rotated relative to one another by means of the actuator.
  • casing 1 can be secured to the other of said component parts.
  • Spindle 6 comprises two cylindrical and smooth sections 8 and an intermediate section 9 with rectilinear splines on its peripheral surface.
  • a threaded sleeve 10 has internal splines engaging with the intermediate spindle section 9 and an external, multi-start coarse thread engaging with a corresponding internal thread on the centre part 2 of casing 1.
  • a working chamber 11 is defined on each side of sleeve 10 between centre part 2 and a cylinder end part 5 and in each working chamber a piston 12, which is inwardly sealed against the smooth spindle section 8 and outwardly sealed against the internal surface of cylinder 3, is freely movable. It is pointed out that pistons 12 may be omitted if the threaded sleeve is designed so as to function as a double-acting piston intermediate the two working chambers.
  • a bore 13 in each end part 5 is adapted for the connection of an external line (not shown) carrying a hydraulic or pneumatic working fluid to and from the respective working chamber 11.
  • an annular holder 14 is connected to spindle 6 by means of a driver pin 15 engaging in a groove in the holder which, thus, rotates together with the spindle.
  • a milled groove in the periphery of holder 14 serves as guide for a radially displaceable shoe 16 which is outwardly biased by means of a compression spring 17 to abut against that surface of end part 5 in which bore 13 opens.
  • shoe 16 In its outwardly oriented peripheral or abutment surface 18 shoe 16 has a tangentially extending duct or groove 19, the axial position of which is such that it is located opposite bore 13 when spindle 6 and holder 14 assume the angular position relative to the casing shown in Figs. 2 and 3. It is remarked that in Figs. 6 and 7 the width and depth of groove 19 have been shown exaggerated for the sake of clarity. In practice these dimensions may be about 0.5 mm.
  • bore 13 at the left hand end of the actuator communicates with a non-pressurized zone and holder 14 at that end of the actuator assumes an angular position in which its shoe 16 is angularly spaced from the mouth of bore 13 so that the working fluid can flow unhindered out from the left hand chamber 11 when the pressure on the right hand end of the right hand piston 12 presses that piston and, hence, threaded sleeve 10 and the left hand piston 12 towards the left.
  • the threaded engagement between sleeve 10 and the centre part 2 of casing 1 produces the desired relative rotation of the casing and the spindle.
  • FIGs. 4 and 5 illustrate a slightly modified variant in which the fluid inflow and outflow occur through the spindle of the actuator.
  • Those parts of the actuator which are substantially identical in both embodiments, have been given the same reference numerals as in Figs: 1-3.
  • the working fluid is supplied and exhausted through a central bore 21 in spindle 6 and a connected radial bore 22 which opens in the surface of the smooth spindle section 8.
  • An annular holder 23 is connected to end part 5 for rotation therewith by means of a pin 24 secured in the casing and engaging in a groove in the outer periphery of the holder.
  • Holder 23 has been shown with three angularly spaced guides for radially displaceable shoes 25, 26, and 27 which are spring-loaded inwardly towards spindle 6.
  • the shoes In their inwardly oriented cylindrical surfaces the shoes have throttling grooves similar to groove 19 in the first described embodiment.
  • Shoe 25 functions, in the same way as shoe 16, to throttle the outflow of the working fluid and, thus, retard the rotational movement at the termination thereof.
  • the further shoes 26 and 27 produce, in a similar manner, a throttling and retardation of the rotation when the two actuator parts assume corresponding positions intermediate their end positions.
  • the tangential length of each shoe is chosen dependent on the angle of rotation in which the retardation shall be effective.
  • Figs. 2 and 3 there is a corresponding option of mounting several. mutually staggered shoes in holder 14.
  • the invention may also be embodied in actuators in which one or both connecting bores for the working fluid-extend through the casing end parts in parallel to the axis. In that case the throttling shoe or shoes will be mounted for axial displacement and axially spring-biased against that inner surface of the end part in which the bore opens.
  • each radially extending edge of the vane carries a throttling shoe which cooperates with an associated aperture in the adjoining end wall of the cylinder in which the vane oscillates.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Soil Working Implements (AREA)
EP81300561A 1980-02-12 1981-02-11 Drehantrieb Withdrawn EP0034069A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK59980A DK59980A (da) 1980-02-12 1980-02-12 Drejeaktivator
DK599/80 1980-02-12

Publications (1)

Publication Number Publication Date
EP0034069A1 true EP0034069A1 (de) 1981-08-19

Family

ID=8095390

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81300561A Withdrawn EP0034069A1 (de) 1980-02-12 1981-02-11 Drehantrieb

Country Status (6)

Country Link
EP (1) EP0034069A1 (de)
JP (1) JPS56113804A (de)
AU (1) AU6655181A (de)
DK (1) DK59980A (de)
FI (1) FI810367L (de)
NO (1) NO810440L (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0123781A2 (de) * 1983-03-28 1984-11-07 Mannesmann Rexroth Pneumatik Gmbh Einrichtung zum Beeinflussen der Drehgeschwindigkeit einer Welle
EP0127080A1 (de) * 1983-05-25 1984-12-05 Zaytran Inc. Drehantrieb
WO1996018043A1 (en) * 1994-12-05 1996-06-13 Scana Skarpenord A/S Hydraulic rotary activator
EP1238166A1 (de) * 1999-11-23 2002-09-11 1994 Weyer Family Limited Partnership Hydraulisches sammelwerkzeug

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3213760A (en) * 1963-10-23 1965-10-26 Flo Tork Inc Fluid cushion

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3213760A (en) * 1963-10-23 1965-10-26 Flo Tork Inc Fluid cushion

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0123781A2 (de) * 1983-03-28 1984-11-07 Mannesmann Rexroth Pneumatik Gmbh Einrichtung zum Beeinflussen der Drehgeschwindigkeit einer Welle
EP0123781A3 (en) * 1983-03-28 1986-04-02 Wabco Westinghouse Steuerungstechnik Gmbh & Co. Device for influencing the rotation speed of a shaft
EP0127080A1 (de) * 1983-05-25 1984-12-05 Zaytran Inc. Drehantrieb
US4603616A (en) * 1983-05-25 1986-08-05 Zaytran Inc. Rotary actuator
WO1996018043A1 (en) * 1994-12-05 1996-06-13 Scana Skarpenord A/S Hydraulic rotary activator
US5918530A (en) * 1994-12-05 1999-07-06 Scana Skarpenord As Hydraulic rotary actuator
EP1238166A1 (de) * 1999-11-23 2002-09-11 1994 Weyer Family Limited Partnership Hydraulisches sammelwerkzeug
EP1238166A4 (de) * 1999-11-23 2003-07-30 1994 Weyer Family Ltd Partners Hydraulisches sammelwerkzeug

Also Published As

Publication number Publication date
DK59980A (da) 1981-08-13
NO810440L (no) 1981-08-13
AU6655181A (en) 1981-08-20
FI810367L (fi) 1981-08-13
JPS56113804A (en) 1981-09-08

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LU NL SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19820728

RIN1 Information on inventor provided before grant (corrected)

Inventor name: NIELSEN, ARNE LYKKE

Inventor name: SOENDERGAARD, JORGEN