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WO1998006953A1 - Fourche pour transmission a arbre cannele - Google Patents

Fourche pour transmission a arbre cannele Download PDF

Info

Publication number
WO1998006953A1
WO1998006953A1 PCT/IT1997/000191 IT9700191W WO9806953A1 WO 1998006953 A1 WO1998006953 A1 WO 1998006953A1 IT 9700191 W IT9700191 W IT 9700191W WO 9806953 A1 WO9806953 A1 WO 9806953A1
Authority
WO
WIPO (PCT)
Prior art keywords
fork
housing
immobilizing element
immobilizing
seat
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.)
Ceased
Application number
PCT/IT1997/000191
Other languages
English (en)
Inventor
Edi Bondioli
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of WO1998006953A1 publication Critical patent/WO1998006953A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
    • F16D3/26—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected
    • F16D3/38—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected with a single intermediate member with trunnions or bearings arranged on two axes perpendicular to one another
    • F16D3/382—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected with a single intermediate member with trunnions or bearings arranged on two axes perpendicular to one another constructional details of other than the intermediate member
    • F16D3/387—Fork construction; Mounting of fork on shaft; Adapting shaft for mounting of fork
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/06—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end
    • F16D1/08—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key
    • F16D1/0894—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with other than axial keys, e.g. diametral pins, cotter pins and no other radial clamping
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/10—Quick-acting couplings in which the parts are connected by simply bringing them together axially
    • F16D1/108—Quick-acting couplings in which the parts are connected by simply bringing them together axially having retaining means rotating with the coupling and acting by interengaging parts, i.e. positive coupling
    • F16D1/116—Quick-acting couplings in which the parts are connected by simply bringing them together axially having retaining means rotating with the coupling and acting by interengaging parts, i.e. positive coupling the interengaging parts including a continuous or interrupted circumferential groove in the surface of one of the coupling parts
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/10—Quick-acting couplings in which the parts are connected by simply bringing them together axially
    • F16D2001/103—Quick-acting couplings in which the parts are connected by simply bringing them together axially the torque is transmitted via splined connections

Definitions

  • the base of the fork has an enlarged portion around the said housing for the immobilizing element and the said housing accommodates the tapered immobilizing element and a clamping element that screws into an internal screw thread formed adjacent to the mouth of the said housing; this clamping element is thus enclosed within the thickness of the said enlarged portion when it acts on the immobilizing element in order to drive it into the active state.
  • the immobilizing element has two cylindrical guide surfaces within the said housing, adjacent to its tapered portion, which is roughly frustoconical.
  • the immobilizing element may has two misaligned cylindrical guide surfaces and a lateral tapered portion shaped for engaging with the annular recess of the splined shaft.
  • the immobilizing element may have only one cylindrical guide surface in which the lateral tapered portion is formed.
  • the immobilizing element may have an end cut for the correct angular positioning thereof in its seat.
  • contact between the immobilizing element and the clamping element takes place on a convex surface in order to produce central and essentially point-like contac .
  • the said enlarged portion can extend asymmetrically around the said housing, without forming any projections, rather than forming an enlarged portion that is symmetrical about the axis of the fork and of the shaft.
  • the morphology of the components of the unit, to which the splined shaft is to be engaged must be modified to make it suitable for the application of the immobilizing element provided by the invention.
  • the housing for the immobilizing element may be formed partially in a bush projecting from the unit and surrounding the splined shaft, and partially in an additional ring which is fitted on said bush and so shaped as to complete the housing for the immobilizing element and the clamping element as well.
  • Figs 1 and 2 show a diagram of a conventional fork, as a side view in partial axial section and as a cross-section on II-II of Fig. 1, respectively;
  • Fig. 3 shows a side view of a fork made according to the invention
  • Fig. 4 is a cross-section on IV-IV of Fig. 3 showing the members in the immobilizing stage;
  • Fig. 5 is similar to Fig. 4, but shows the components separated from one another;
  • Fig. 6 shows a view in partial cross-section on the line VI-VI in Fig. 3;
  • Figs. 7 to 12 show an embodiment which is modified with respect to the one of Fig. 4, as well as the immobilizing element in isolation in its geometrical views;
  • Figs. 13 to 17 show a further modified embodiment in exploded view similar to Fig. 5, and further geometrical views of the immobilizing element;
  • Figs. 18, 19 and 20 show an embodiment with a bush and an additional ring, in two external views and in cross- section on line XX-XX of Fig. 18;
  • Figs. 21, 22 and 23 show the bush forming component illustrated in Figs. 18 and 20, in isolation, in two external views and in cross-section on line XXIII-XXIII of Fig. 21;
  • Figs. 24 to 26 show the additional ring in two external views and in partial cross-section on line XXIV-XXiv of Fig. 25, and in cross-section on line XXVI-XXVI of Fig. 24 with the immobilizing and clamping elements separated from one another;
  • Fig. 27 shows a cross-section of a modified version of the embodiment of Figs. 18 to 26.
  • a conventional fork - used in cardan shafts or equivalent mechanisms - is illustrated in Figs 1 and 2 where the reference 1 denotes the base of the fork, the reference 3 denotes the fork arms containing the diametral seat 5 for the spider of a universal joint, and the reference 7 denotes the splined, that is broached, axial seat that accommodates the splined shaft which engages rotatably in the fork by means of the corresponding longitudinal splines in the shaft and in the seat 7.
  • the shaft has an annular recess which, once assembled, engages with an immobilizing element 9 which is inserted in a seat essentially tangential to the base 1 and which presses against the bottom of the annular recess so as to immobilize the shaft in terms of axial displacement.
  • the immobilizing element 9 has a sloping profile 9A and a threaded end 9B that projects out of the base 1 so as to accommodate a clamping nut 10 which, as it is screwed down, drives the immobilizing element 9 and its sloping surface 9A against the bottom of the annular recess formed in the shaft to be immobilized.
  • the projecting portion formed by the terminal threaded shank 9B of the immobilizing element 9 and by the nut 10 - which is screwed down on to the base 1 of the fork by means of a conventional tool - constitutes a hazard since there is a risk of it catching accidentally on an item of clothing or some other article which could then cause injury to the operators.
  • the fork 21 has an essentially conventional shape in terms of its arms 21A which contain the seats 2IB for the spider in the same way as the arms 3 and the seats 5.
  • the base 21C of the fork is essentially asymmetrical in that it has a lateral enlarged portion 23 forming roughly two profiles 23A and 23B which are essentially almost at right angles to each other; the housing 25 is formed in the enlarged portion 23, essentially tangentially to the splined seat 27 that corresponds to the seat 7 of the conventional embodiment shown in Figs 1 and 2.
  • the housing 25 In the mouth area 25A, which opens out on to the flattened profile 23A, the housing 25 has an internal screw thread over a short portion, followed by a cylindrical guide surface 25B, in turn followed by a terminal cylindrical guide surface 25C having a smaller diameter than the surface 25B.
  • the reference 29 denotes the immobilizing element which is inserted so as to slide in the housing 25; this immobilizing element 29 has an intermediate portion 29A which is tapered in a frustoconical shape, to which are adjacent two cylindrical guide surfaces 29B and 29C (see in particular Fig.
  • the reference 31 denotes a clamping element having an external screw thread 31A which can be screwed into the internal screw thread 25A formed in the mouth of the housing 25, which element 31 terminates in a surface 3IB designed to come into contact with the convex surface 29E of the immobilizing element 29.
  • the clamping member 31 In order to tighten and loosen the clamping member 31, it is provided with a non- circular axial recess 31C into which a suitable screwing and unscrewing tool can be inserted.
  • the immobilizing element 29 can slide in the housing 25, being fully guided via its guide surfaces 29B and 29C along the surfaces 25B and 25C of the housing 25, and is clamped by screwing down the clamping member 31, the surface 3IB of which comes into virtually point-like contact with the central zone of the slightly convex terminal surface 29E of the immobilizing element 29.
  • the immobilizing element 29 can be driven in so that its tapered surface 29A acts on the bottom of the annular recess formed in the splined shaft accommodated in the splined seat 27, and any relative axial sliding between the fork and the shaft is prevented.
  • the clamping member 31 is completely enclosed inside the housing 25 and does not project from the profile 23A of the enlarged portion 23 formed in the base 21C of the fork 21.
  • the enlarged portion 23 is shaped such that there is no possibility of it catching accidentally during rotation given that it has no projecting elements. It is, of course, possible for the base 21C of the fork to be enlarged in a way which is morphologically different from the shape of the enlarged portion 23 - even going as far as having an enlarged portion with a circular cross-section - if and when size restrictions allow this and also bearing in mind the considerable additional weight and cost such a fork would involve.
  • Figs. 7 to 12 Shown in Figs. 7 to 12 is a modified version of the embodiment in Fig. 5, wherein the same elements are indicated by the same references of said Fig. 5 and preceding figures, increased by "100", a part from the different designations referred to herebelow.
  • the housing 125 is partially modified by having the screw thread 125A and the cylindrical guide surface 125B slightly extended and the surface 125C virtually reduced and not used.
  • the clamping element 131 (equivalent to that indicated by 31) is screwed into thread 125A in order to act on the slightly convex surface 129E of the immobilizing element 129.
  • the immobilizing element 129 has only one cylindrical surface 129F for guiding the element 129 within the surface 125B of the housing 125.
  • a lateral tapered portion in the form of a convex surface 129G, said tapered portion being of arcuate shape to cooperate with the surfaces of the annular recess provided in the splined shaft for the axial engagement thereof.
  • the profile 129F is made to correspond to the interference region between the housing 125 and the splined seat 127 for the splined shaft to be engaged.
  • the profile 129G is thus able to cooperate with the usual annular recess formed in the splined shaft for the axial engagement thereof.
  • a cut 129H Formed in the end surface 129E of the immobilizing element 129 is a cut 129H, parallel to a diameter but offset with respect to the centre of the surface 129E, allowing the angular orientation of the immobilizing element 129 within its cylindrical housing 125, so as to correctly position the profile 129G with respect to the seat 127.
  • the displacement of the cut 129H with respect to the centre of surface 129E ensuring the contact of the clamping element 131 against the centre of the convex surface 129E of the immobilizing element 129F.
  • the immobilizing element 129 rests continuously with its cylindrical surface 129F against the surface 125B of housing 125, so as to ensure a complete distribution of stresses which may be applied on said immobilizing element during operation.
  • Figs. 13 to 17 show, in a way equivalent to Figs. 8 to 12, a further odifed embodiment with respect to the example of Figs. 1 to 6 and to the example of Figs. 7 to 12.
  • the housing 225 has a screw thread 225A for the clamping element 231, and said housing 225 is further provided with both the cylindrical surface 225B and a cylindrical surface 225C of reduced diameter and misaligned with respect to the screw thread 225A.
  • the immobilizing element 229 has a terminal convex surface 229E with a cut 229H equivalent to that indicated by 129H for the same function.
  • the element 229 has the cylindrical surface 229F for the guide and support along the cylindrical surface 225B of the housing 225, and is provided with a cylindrical extension 229L, having a diameter smaller than surface 229F and being misaligned with respect to the latter in order to be received within the portion 225C of the housing 225.
  • the surface 229F has a lateral tapered portion with profiles 229G, equivalent to those indicated by 129G, in order to cooperate with the annular recess usually provided in the splined shaft which has to be axially engaged in the seat 227.
  • the cylindrical guide surface 229F rests continuously against the surface 225B of the housing 225 in order to apply stresses thereon which the immobilizing element 229 may be subjected to during operation.
  • Figs. 18 to 26 show an embodiment wherein provision is made for a further component in the form of an additional ring 350 which fits on a bush-like projection 352 formed by a component 354 such as a fork of a universal joint to which the splined shaft, provided with the usual annular recess, is to be axially engaged.
  • the bush 352 is developed around the seat 327, the latter being equivalent to those indicated by 27, 127 and 227 in the preceding examples.
  • the additional ring 350 is shaped with a lateral enlarged portion 323 corresponding to that indicated by 23 for the purpose, already indicated herebefore, of avoiding projections of the immobilizing elements for the splined shaft.
  • the additional ring 350 is positioned and retained on the bush 352 by a threaded dowel 356 which is screwed in a radial hole 358 of the ring and is received, with its inner appendix, within a blind hole 358 of the bush 352.
  • a housing for the immobilizing element 329 which in said Figs. 18 to 26 is similar to that indicated by 229, formed partially in the bush 352 and partially in the ring 350, starting from the enlarged portion 323.
  • the housing portion in the bush is shown at 360 and the housing portion in the ring is shown at 362.
  • the portion 362 has a screw thread 362A equivalent to those indicated by 125A and 225A, and which extends into a cylindrical surface portion 362B equivalent to those shown at 125B and 225B, as well as into an extension of misaligned housing 362C equivalent to that indicated by 225C.
  • the housing portion 360 within the bush 352 has a partial cylindrical surface 360B able to be combined with that indicated by 362B, and a portion of surface 360C able to be combined with that indicated by 362C.
  • the screw thread 362A is fully formed in the portion 362.
  • the profile 329G is made to cooperate with the splined shaft at the interference regions between the housing portion 360 and the seat 327 for the splined shaft.
  • the immobilizing element 329 is angularly adjusted through a cut 329H and is forced into the housing, made up of portions 360 and 362, by means of a clamping element 331 equivalent to that shown at 31 or 131 or 231.
  • Fig. 27 shows, in a cross-section equivalent to that of Fig. 20, a modified version in which the various elements are operatively fully equivalent but morphologically modified.
  • an immobilizing element 429 different from that shown at 329 but equivalent to the one shown at 129, having a cylindrical surface development which copperates with the partial cylindrical surface 462 (equivalent to the one shown at 362) and with the partial cylindrical surface formed in the bush 452, so as to be equivalent to the arrangement in the ring 350 and bush 352; the immobilizing element 429 is provided with a profile 429G equivalent to that shown at 129G and previously described for the same functions.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bolts, Nuts, And Washers (AREA)
  • Mechanical Operated Clutches (AREA)

Abstract

La base (21C) de la fourche présente une partie élargie (23) autour du logement (25) de l'élément d'immobilisation (29) de sorte que l'arbre cannelé de la fourche (21) soit bloqué axialement par l'élément d'immobilisation (29) s'engageant de manière tangentielle dans l'évidement annulaire situé dans l'arbre. Ledit logement (25) loge également l'élément d'immobilisation (29) à partie conique (29A) et un élément de serrage (31) qui se visse dans un filetage femelle (25B) formé à proximité de l'embouchure dudit logement (25). L'élément de serrage (31) se trouve ainsi pris dans l'épaisseur de la partie élargie (23) et met l'élément d'immobilisation (29) dans un état actif.
PCT/IT1997/000191 1996-08-14 1997-07-28 Fourche pour transmission a arbre cannele Ceased WO1998006953A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT96FI000196A IT1286697B1 (it) 1996-08-14 1996-08-14 Forcella per trasmissione meccanica ad albero scanalato,con protezione antinfortunistica
ITFI96A000196 1996-08-14

Publications (1)

Publication Number Publication Date
WO1998006953A1 true WO1998006953A1 (fr) 1998-02-19

Family

ID=11351786

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT1997/000191 Ceased WO1998006953A1 (fr) 1996-08-14 1997-07-28 Fourche pour transmission a arbre cannele

Country Status (2)

Country Link
IT (1) IT1286697B1 (fr)
WO (1) WO1998006953A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3315809A1 (fr) * 2016-10-25 2018-05-02 Benzi & Di Terlizzi s.r.l. Dispositif approprié pour la suppression du jeu axial et radial dans une connexion entre un arbre et un moyeu de transmission mécanique

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1220675B (de) * 1959-08-19 1966-07-07 Bernhard Walterscheid Mueller Sicherung einer Nabe auf einer Keilwelle
US4579477A (en) * 1983-05-19 1986-04-01 Hartman Thomas A Pin-key assembly
EP0501149A1 (fr) * 1991-02-27 1992-09-02 GKN Walterscheid GmbH Serrure pour fixation d'un manchon d'accouplement

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1220675B (de) * 1959-08-19 1966-07-07 Bernhard Walterscheid Mueller Sicherung einer Nabe auf einer Keilwelle
US4579477A (en) * 1983-05-19 1986-04-01 Hartman Thomas A Pin-key assembly
EP0501149A1 (fr) * 1991-02-27 1992-09-02 GKN Walterscheid GmbH Serrure pour fixation d'un manchon d'accouplement

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3315809A1 (fr) * 2016-10-25 2018-05-02 Benzi & Di Terlizzi s.r.l. Dispositif approprié pour la suppression du jeu axial et radial dans une connexion entre un arbre et un moyeu de transmission mécanique

Also Published As

Publication number Publication date
ITFI960196A1 (it) 1998-02-14
IT1286697B1 (it) 1998-07-15

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