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WO2010067146A1 - Système de suspension destiné à un véhicule automobile et véhicule automobile équipé d’un tel système de suspension - Google Patents

Système de suspension destiné à un véhicule automobile et véhicule automobile équipé d’un tel système de suspension Download PDF

Info

Publication number
WO2010067146A1
WO2010067146A1 PCT/IB2008/055670 IB2008055670W WO2010067146A1 WO 2010067146 A1 WO2010067146 A1 WO 2010067146A1 IB 2008055670 W IB2008055670 W IB 2008055670W WO 2010067146 A1 WO2010067146 A1 WO 2010067146A1
Authority
WO
WIPO (PCT)
Prior art keywords
leaf spring
suspension system
chassis
automotive vehicle
axis
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/IB2008/055670
Other languages
English (en)
Inventor
Jean-Marc Blond
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.)
Renault Trucks SAS
Original Assignee
Renault Trucks SAS
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 Renault Trucks SAS filed Critical Renault Trucks SAS
Priority to PCT/IB2008/055670 priority Critical patent/WO2010067146A1/fr
Publication of WO2010067146A1 publication Critical patent/WO2010067146A1/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
    • 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
    • F16F1/26—Attachments or mountings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G11/00—Resilient suspensions characterised by arrangement, location or kind of springs
    • B60G11/02—Resilient suspensions characterised by arrangement, location or kind of springs having leaf springs only
    • B60G11/04—Resilient suspensions characterised by arrangement, location or kind of springs having leaf springs only arranged substantially parallel to the longitudinal axis of the vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G11/00—Resilient suspensions characterised by arrangement, location or kind of springs
    • B60G11/02—Resilient suspensions characterised by arrangement, location or kind of springs having leaf springs only
    • B60G11/10—Resilient suspensions characterised by arrangement, location or kind of springs having leaf springs only characterised by means specially adapted for attaching the spring to axle or sprung part of the vehicle
    • B60G11/12—Links, pins, or bushes
    • 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
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/10—Mounting of suspension elements
    • B60G2204/12—Mounting of springs or dampers
    • B60G2204/121—Mounting of leaf springs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/40—Auxiliary suspension parts; Adjustment of suspensions
    • B60G2204/42—Joints with cam surfaces

Definitions

  • This invention concerns a suspension system for an automotive vehicle comprising at least a leaf spring.
  • the invention also concerns an automotive vehicle, in particular a truck, equipped with such a suspension system.
  • a leaf spring 1 is made of a number of metallic leaves, only two such leaves being represented on figure 1 , with reference 11 and 12, for the sake of simplicity.
  • Leaf spring 1 is bended at the level of its front end in order to form a front eye 13 which surrounds a shaft 2 extending along an axis Y 2 which is perpendicular to the longitudinal axis X-X' of a truck represented by its chassis 3.
  • Shaft 2 is directly mounted on chassis 3, whereas a lever 4 connects the back end or free end 14 of leaf spring 1 to chassis 3.
  • Lever 4 is articulated on two pins 41 and 42 respectively fast with back end 14 and chassis 3.
  • a transient effort E is exerted on a central part 15 of leaf spring 1 , e.g. by a front axle of the truck, this induces a deformation of leaf spring 1 which takes the configuration represented in dashed lines.
  • a central point A of leaf spring 1 follows a curved path C which is substantially in the form of an arc of a circle centered on a specific point P called Ross point.
  • This curved path C of point A induces undesired movements in the steering system of the truck.
  • a solution to solve this problem is to try to fix the end of the steering link at the so called "Ross point" of the spring lever, that is at the center of rotation of the substantially circular path of a central point of the leaf spring.
  • Ross point the so called "Ross point” of the spring lever, that is at the center of rotation of the substantially circular path of a central point of the leaf spring.
  • This Ross point can vary from one spring leaf to another.
  • Such an approach requires to install a steering gear unit as close as possible to the Ross point, which is not always possible. Because of the general shape of a leaf spring, the location of its Ross point is such that the steering gear unit must be installed above the leaf spring. This is sometimes difficult.
  • FR-A-682 635 It is known from FR-A-682 635 to use an eyelet where a cylindrical block is mounted within a bush with a possibility of rotation in order to allow a movement of an eye of a leaf spring, along a longitudinal direction of a chassis. Such an approach does not allow to actually control the movement of a central part of a leaf spring. It is also known from JP-A-6206414 to prevent rear axle steering by using an eccentric pin to mount a leaf spring on a chassis. The eyelet of the leaf spring must have a sliding movement with respect to the eccentric part in order to allow an adaptation of their relative position. This implies that the movement of a central part of the leaf spring must be monitored by a lever which drives a rotating lever whose movement is transferred to an end of the leaf spring. This is complicated and, therefore, expensive.
  • the invention aims at providing a suspension system where the movement of a central part of a leaf spring can be precisely controlled, so that its path avoids or substantially limits undue movements of the corresponding steering knuckle and steered wheel, or of the rear axle of a truck, when a transient effort is applied on the leaf spring.
  • the invention concerns a suspension system of an automotive vehicle, this system comprising at least a leaf spring and mounting means to connect the leaf spring to a chassis of the vehicle.
  • This system is characterized in that at least one end of the leaf spring is fixedly connected to an external surface of an eccentric bushing articulated on the chassis around an axis perpendicular to a longitudinal axis of the leaf spring.
  • the rigid connection between the end of the leaf spring and the external surface of the eccentric bushing makes it possible to control a longitudinal movement of the leaf spring when the eccentric bushing rotates.
  • Such a system might incorporate one or several of the following features: -
  • the end of the leaf spring forms an eye which surrounds the bushing on more than 180° preferably more than 270°.
  • the end of the leaf spring is welded on the eccentric bushing. Alternatively, the end of the leaf spring is press-fitted on the eccentric bushing or locked on the eccentric bushing by cooperation of shapes.
  • a second end of the leaf spring which is opposite to the end fast with the eccentric bushing, is connected to the chassis via a lever articulated on this second end and on the chassis, around two axes perpendicular to the longitudinal axis of the leaf spring.
  • the invention also concerns an automotive vehicle, in particular a truck, equipped with a suspension system as mentioned here-above.
  • the leaf spring extends along a longitudinal axis parallel to a longitudinal axis of the chassis of the vehicle and is fixedly connected to the external surface of the eccentric bushing, at its front end.
  • - figure 2 is a view similar to figure 1 , for a suspension system according to the invention;
  • - figure 3 is an enlarged view of detail III on figure 2;
  • figure 4 is a view similar to figure 2 when a transient effort is exerted on the leaf spring of the suspension system;
  • - figure 5 is an enlarged view of detail V on figure 4; and - figure 6 is an enlarged view similar to figure 5 when a transient effort is exerted on the leaf spring in a direction opposite to the effort shown on figure 4.
  • the suspension system 100 represented on figures 2 to 6 includes a leaf spring 101 mounted on a chassis 103 of a truck.
  • X-X' denotes a longitudinal axis of chassis 103 which extends in a frontward/backward direction of the truck.
  • Leaf spring 101 is mounted on chassis 103 via a pin 102 centered on an axis Yio 2 which is perpendicular to axis X-X' and horizontal when the truck rests on a horizontal surface.
  • Xioi denotes a longitudinal axis of leaf spring 101.
  • Axis X101 is parallel to axis X-X' and perpendicular to Y 102 -
  • Leaf spring 101 is made of one or several metallic leaves, only two such leaves being represented on figures 2 to 6, with references 111 and 112, for the sake of simplicity.
  • the front end 113 of leaf spring 101 has the form of an eye or eyelet which surrounds pin 102 on an angle ⁇ of about 315°.
  • the back end or free end 114 of leaf spring 111 is articulated on a lever 104 which is articulated around a pin 142 fast on chassis 103 and extending parallely to axis Yio2-
  • a pin 141 mounted on back end 114 allows the articulation of lever
  • Pins 141 and 142 form articulation axles for lever 104.
  • the invention is not limited to such type of connection of the free end of the spring.
  • An eccentric metallic bushing 105 is mounted around pin 102 with a possibility of rotation.
  • the internal radial surface 151 of bushing 105 is cylindrical with a circular cross section adapted to the circular cross section of the outer surface 121 of pin 102.
  • the outer surface 152 of bushing 105 has an eccentric shape and the eye formed by front end 113 is fixedly connected to this surface 152.
  • Three welding points 16 make end 113 fast with bushing 105. The number of welding points can be different from three.
  • angle ⁇ allows efficient fastening of front end 113 on surface 152.
  • Angle ⁇ is chosen larger than 180° preferably larger than 270° the value 315°giving good results.
  • Y 152 denotes a central geometrical axis of surface 152. Axes Y102 and Y152 are parallel but, because of the eccentricity of surface 152, they are not in alignment. Y 152 forms a reference axis for the front end 113 of leaf spring 101.
  • axes Y 102 and Y 152 are aligned on a same vertical plane P 0 , with Y 152 being above Y 102 .
  • a straight line L 1 joining axes Y ⁇ O2 and Y 152 in the plane of figure 5 makes a positive angle ⁇ i, of about 15° with respect to plane P o-
  • the angle ⁇ o between line L 1 and plane Po equals 0.
  • reference axis Y 152 is moved to the left of figures 2 to 5, which involves a corresponding movement of front end 113 and the remaining parts of leaf spring 101 , in particular its central part 115 which is displaced with respect to the chassis with a movement parallel to axis X 101 .
  • front end 113 of leaf spring 101 is fixedly connected to the outer surface 152 of eccentric bushing 105 induces that the offset of reference axis Y 152 induces a corresponding offset of a point A belonging to a central part 115 of leaf spring 101.
  • the path of point A resulting from transient effort E takes the configuration of curve C shown in dotted line on figure 4, which is bended to the left above the central part 115 of spring 101 in the configuration of figure 3.
  • the effect of effort E is that point A follows a curve C centered on a Ross point P' which is lower than point P on figure 1. Thanks to an appropriate choice of the distance between axes Y102 and Y152, Ross point P can even be below axis Y101, as shown on figure 4.
  • Curve C is represented in dashed line on figure 4, for the sake of comparison.
  • spring 101 takes the configuration of figure 6 where line Li makes a negative angle ⁇ 2 of about 15° with respect to plane P 0 and axis Y152 moves towards back end 114, so that front end 113 and all other parts of spring 101 move to the right on figures 4 and 6.
  • point A moves to the right on figure 4.
  • curve C is on the right of curve C in its part below leaf spring 101 on figure 4. Therefore, curve C can be approximated as an arc of circle centered on a equivalent Ross point P' located below the Ross point P of the spring considered alone, possibly even below leaf spring 101. The fact that the resulting equivalent
  • Ross point P' is lower than the Ross point P of the spring on its own allows to install the steering gear in a lower position, while still limiting pivoting parasitic pivoting movement.
  • angles ⁇ i and ⁇ 2 given here above correspond to an example of the amplitude of the oscillation movement of bushing 105 around axis Y102. This amplitude is generally less than 20° in both direct ions.
  • the initial setting of the eccentric bushing is such that, in the absence of dynamic load, and for a given static load, axis Yi 52 is above axis Y 102 Such initial setting results in a lower equivalent Ross point P'. Nevertheless, depending on the exact result which one seeks to obtain, it could be chosen to have a different initial setting. For example, having an initial setting where axis Y 102 is above axis Yi 52 , which is equivalent to initial angle ⁇ 0 equal to 180 degrees, would result in having an equivalent Ross point P' higher than the Ross point of the spring considered alone. Other initial settings could also be chosen, with an initial angle ⁇ o ranging between 0 and 360 degrees.
  • the invention can also be implemented in a suspension system of a trailer.
  • front end 113 of leaf spring 101 can be press-fitted on surface 152 or mechanically locked on eccentric bushing 105 by cooperation of shapes. In such a case, it is not necessary to use welding points 16.
  • the invention has been represented when implemented with a metallic bushing 105.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Springs (AREA)
  • Vehicle Body Suspensions (AREA)

Abstract

Ce système de suspension destiné à un véhicule automobile comprend au moins un ressort à lames (111, 112) et des moyens de montage (105, 104) pour relier le ressort à lames à un châssis du véhicule. Au moins une extrémité (113) du ressort à lames est reliée de manière fixe à une surface externe d’un manchon décalé (105) s’articulant sur le châssis autour d’un axe (Y102) perpendiculaire à un axe longitudinal (X101) du ressort à lames (111, 112).
PCT/IB2008/055670 2008-12-08 2008-12-08 Système de suspension destiné à un véhicule automobile et véhicule automobile équipé d’un tel système de suspension Ceased WO2010067146A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IB2008/055670 WO2010067146A1 (fr) 2008-12-08 2008-12-08 Système de suspension destiné à un véhicule automobile et véhicule automobile équipé d’un tel système de suspension

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2008/055670 WO2010067146A1 (fr) 2008-12-08 2008-12-08 Système de suspension destiné à un véhicule automobile et véhicule automobile équipé d’un tel système de suspension

Publications (1)

Publication Number Publication Date
WO2010067146A1 true WO2010067146A1 (fr) 2010-06-17

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2008/055670 Ceased WO2010067146A1 (fr) 2008-12-08 2008-12-08 Système de suspension destiné à un véhicule automobile et véhicule automobile équipé d’un tel système de suspension

Country Status (1)

Country Link
WO (1) WO2010067146A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015005841A1 (fr) * 2013-07-11 2015-01-15 Volvo Truck Corporation Suspension de véhicule et ressort à lames s'y rapportant

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB189370A (en) * 1922-01-04 1922-11-30 Eduard Zaparka Improvements in and relating to the suspension of power driven vehicles and the like
GB335116A (en) * 1929-11-25 1930-09-18 Bertram Arthur Payne Improvements in or relating to spring suspension systems for vehicles
GB851794A (en) * 1958-04-09 1960-10-19 Rolls Royce Beam type axle mountings of self propelled land vehicles
GB940609A (en) * 1961-02-09 1963-10-30 Opel Adam Ag Resilient bushing for a leaf spring eye
EP1630012A1 (fr) * 2004-08-23 2006-03-01 Ford Global Technologies, LLC, A subsidary of Ford Motor Company Palier avec logement excentrique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB189370A (en) * 1922-01-04 1922-11-30 Eduard Zaparka Improvements in and relating to the suspension of power driven vehicles and the like
GB335116A (en) * 1929-11-25 1930-09-18 Bertram Arthur Payne Improvements in or relating to spring suspension systems for vehicles
GB851794A (en) * 1958-04-09 1960-10-19 Rolls Royce Beam type axle mountings of self propelled land vehicles
GB940609A (en) * 1961-02-09 1963-10-30 Opel Adam Ag Resilient bushing for a leaf spring eye
EP1630012A1 (fr) * 2004-08-23 2006-03-01 Ford Global Technologies, LLC, A subsidary of Ford Motor Company Palier avec logement excentrique

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015005841A1 (fr) * 2013-07-11 2015-01-15 Volvo Truck Corporation Suspension de véhicule et ressort à lames s'y rapportant
WO2015005831A1 (fr) * 2013-07-11 2015-01-15 Volvo Truck Corporation Suspension de véhicule et ressort à lames pour celle-ci

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