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WO1997036118A1 - Ressort en y - Google Patents

Ressort en y Download PDF

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Publication number
WO1997036118A1
WO1997036118A1 PCT/PT1996/000001 PT9600001W WO9736118A1 WO 1997036118 A1 WO1997036118 A1 WO 1997036118A1 PT 9600001 W PT9600001 W PT 9600001W WO 9736118 A1 WO9736118 A1 WO 9736118A1
Authority
WO
WIPO (PCT)
Prior art keywords
spring
leafs
forces
way
points
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/PT1996/000001
Other languages
English (en)
Inventor
António Manuel RELÓGIO RIBEIRO
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.)
Universidade de Lisboa
Original Assignee
Universidade de Lisboa
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 Universidade de Lisboa filed Critical Universidade de Lisboa
Priority to PCT/PT1996/000001 priority Critical patent/WO1997036118A1/fr
Priority to AU50164/96A priority patent/AU5016496A/en
Priority to EP96906964A priority patent/EP0826116A1/fr
Publication of WO1997036118A1 publication Critical patent/WO1997036118A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
    • B60G17/02—Spring characteristics, e.g. mechanical springs and mechanical adjusting means
    • B60G17/023—Spring characteristics, e.g. mechanical springs and mechanical adjusting means the mechanical spring being a leaf spring
    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
    • F16F1/18—Leaf springs
    • F16F1/22—Leaf springs with means for modifying the spring characteristic
    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F3/00—Spring units consisting of several springs, e.g. for obtaining a desired spring characteristic
    • F16F3/02—Spring units consisting of several springs, e.g. for obtaining a desired spring characteristic with springs made of steel or of other material having low internal friction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
    • B60G2202/10—Type of spring
    • B60G2202/11—Leaf spring
    • B60G2202/112—Leaf spring longitudinally arranged
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2500/00—Indexing codes relating to the regulated action or device
    • B60G2500/20—Spring action or springs

Definitions

  • the Y-spring is a leaf spring designed in such a way that the deformation is self-limited.
  • the Y-spring also has a given initial stiffness that, when compressed, tends asymptotically to infinity, while keeping the bending moment (and consequently the maximum stress) at any given section within a limit defined in the design as acceptable.
  • An alternate application of the same spring allows it to support traction forces and acts as a true constant reaction spring.
  • the Y-spring is made of two curved leafs, rigidly joined together at one of their ends in such a way that the surfaces of both touch each other at that end.
  • the leafs length between the touching point and the points where the compression forces are to be applied - working length - is identical for the two leafs.
  • the curvature of each of the leafs has the same sign along their entire working length.
  • the curvature and the bending modulus along each leaf are such that the only points to touch each other are the ones in the immediate vicinity of those already touching.
  • a specially important variant is one where the cross sections are constant along the working length, equal in both leafs and the curvature is symmetrical.
  • the stiffness increases with the deformation, tending to infinity as the points where the forces are applied come closer.
  • the applied forces effect is to straighten the leafs, with a bending moment along the length increasing to the joined ends.
  • this bending moment reaches a value such that the initial curvature of the leafs is nullified, they come in contact, that stops any further deformation and. consequently, any further increase of the stresses in the cross sections already in contact: the value of this maximum stress may and should be chosen such that it is lower than the acceptable maximum stress for the material.
  • Fig. 2 shows how to use the same spring in order to work as a constant reaction spring at traction.
  • the rollers they can also be sliders or others with the same functionality
  • the stresses in the cross sections between the rollers and the contact area of the leafs that is the h length, in the fig.
  • the b length the same size, regardless of the relative position of this area in the leafs, as long as there is a minimum given distance to the joined ends of the leafs.
  • the stresses in the cross sections are the same along the contact zone and between the rollers and the free ends the applied forces do not originate first order stresses. Consequently, the spring reaction is kept constant whatever the rollers position along the working length of the leafs.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Springs (AREA)

Abstract

Nouveau type de ressort, dénommé ressort en Y, destiné à être utilisé dans les cas où les ressorts classiques ne constituent pas une bonne solution, tout au moins lorsqu'on veut éviter l'utilisation conjointe de mécanismes qui augmentent les coûts et réduisent la fiabilité. Ce ressort en Y est un ressort à lames dont la géométrie permet un déformation autolimitée; il présente une rigidité initiale déterminée qui, lorsqu'il est comprimé, tend asymptotiquement à l'infini, alors que le moment de flexion et la contrainte maximale en une section donnée quelconque ne dépassent pas une valeur acceptable définie au départ. Une variante de montage dudit ressort lui permet de supporter des forces de traction et de se comporter comme un ressort à réaction constante vraie. Ce ressort en Y se compose de deux lames habituellement courbes et solidaires l'une de l'autre à l'une de leurs extrémités de sorte que les surfaces des deux lames viennent au contact l'une de l'autre à ladite extrémité. La courbure de chaque lame a le même signe sur toute sa longueur utile. La courbure et le module de flexion le long de chaque lame présentent des valeurs telles que les seuls points pouvant entrer en contact entre eux sont ceux qui se trouvent à proximité immédiate des points déjà en contact.
PCT/PT1996/000001 1996-03-27 1996-03-27 Ressort en y Ceased WO1997036118A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/PT1996/000001 WO1997036118A1 (fr) 1996-03-27 1996-03-27 Ressort en y
AU50164/96A AU5016496A (en) 1996-03-27 1996-03-27 Y-spring
EP96906964A EP0826116A1 (fr) 1996-03-27 1996-03-27 Ressort en y

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/PT1996/000001 WO1997036118A1 (fr) 1996-03-27 1996-03-27 Ressort en y

Publications (1)

Publication Number Publication Date
WO1997036118A1 true WO1997036118A1 (fr) 1997-10-02

Family

ID=20084847

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/PT1996/000001 Ceased WO1997036118A1 (fr) 1996-03-27 1996-03-27 Ressort en y

Country Status (3)

Country Link
EP (1) EP0826116A1 (fr)
AU (1) AU5016496A (fr)
WO (1) WO1997036118A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1541391A1 (fr) 2003-12-10 2005-06-15 Iveco S.p.A. Suspension avec un ressort mécanique à lame de rigidité variable prenant deux valeurs et procédé de réglage du point de génération de la deuxième valeur de rigidité du ressort
EP1541392A1 (fr) 2003-12-10 2005-06-15 Iveco S.p.A. Suspension avec un ressort mécanique à lame de raideur variable et procédé de réglage d'une telle raideur

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR425793A (fr) * 1911-02-09 1911-06-20 Gustave Franz Lyon Perfectionnements aux ressorts
FR441041A (fr) * 1911-12-09 1912-07-27 Houdaille Et Sabot Soc Procédé et dispositif de réglage de la flexibilité d'un ressort à lames et produits en résultant
FR22636E (fr) * 1919-11-22 1921-08-04 Eugene Carlet De La Roziere Ressort de compression à bras de levier décroissant
US1534533A (en) * 1924-06-12 1925-04-21 James Liptrot Ardern Spring suspension for vehicles
US1593507A (en) * 1923-11-24 1926-07-20 Rieser Karl Vehicle spring
FR1003390A (fr) * 1949-12-20 1952-03-17 Suspension de véhicule et dispositif auxiliaire correcteur
FR1036200A (fr) * 1951-04-26 1953-09-04 Sncf Ressort à lames sans frottement et à flexibilité variable
FR2523677A1 (fr) * 1982-03-19 1983-09-23 Leclerc Michel Suspension elastique a ressort, notamment pour vehicule automobile
FR2552376A1 (fr) * 1983-09-22 1985-03-29 Gasquet Georges De Liaison mecanique elastique
JPH04225744A (ja) * 1990-12-27 1992-08-14 Matsushita Seiko Co Ltd レンジフード
JPH068766A (ja) * 1992-03-24 1994-01-18 Kinugawa Rubber Ind Co Ltd アシストグリップ

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR425793A (fr) * 1911-02-09 1911-06-20 Gustave Franz Lyon Perfectionnements aux ressorts
FR441041A (fr) * 1911-12-09 1912-07-27 Houdaille Et Sabot Soc Procédé et dispositif de réglage de la flexibilité d'un ressort à lames et produits en résultant
FR22636E (fr) * 1919-11-22 1921-08-04 Eugene Carlet De La Roziere Ressort de compression à bras de levier décroissant
US1593507A (en) * 1923-11-24 1926-07-20 Rieser Karl Vehicle spring
US1534533A (en) * 1924-06-12 1925-04-21 James Liptrot Ardern Spring suspension for vehicles
FR1003390A (fr) * 1949-12-20 1952-03-17 Suspension de véhicule et dispositif auxiliaire correcteur
FR1036200A (fr) * 1951-04-26 1953-09-04 Sncf Ressort à lames sans frottement et à flexibilité variable
FR2523677A1 (fr) * 1982-03-19 1983-09-23 Leclerc Michel Suspension elastique a ressort, notamment pour vehicule automobile
FR2552376A1 (fr) * 1983-09-22 1985-03-29 Gasquet Georges De Liaison mecanique elastique
JPH04225744A (ja) * 1990-12-27 1992-08-14 Matsushita Seiko Co Ltd レンジフード
JPH068766A (ja) * 1992-03-24 1994-01-18 Kinugawa Rubber Ind Co Ltd アシストグリップ

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 016, no. 576 (M - 1345) 16 December 1992 (1992-12-16) *
PATENT ABSTRACTS OF JAPAN vol. 018, no. 206 (M - 1591) 12 April 1994 (1994-04-12) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1541391A1 (fr) 2003-12-10 2005-06-15 Iveco S.p.A. Suspension avec un ressort mécanique à lame de rigidité variable prenant deux valeurs et procédé de réglage du point de génération de la deuxième valeur de rigidité du ressort
EP1541392A1 (fr) 2003-12-10 2005-06-15 Iveco S.p.A. Suspension avec un ressort mécanique à lame de raideur variable et procédé de réglage d'une telle raideur

Also Published As

Publication number Publication date
EP0826116A1 (fr) 1998-03-04
AU5016496A (en) 1997-10-17

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