Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60G—VEHICLE SUSPENSION ARRANGEMENTS
  • B60G21/00—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces
  • B60G21/02—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected
  • B60G21/04—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected mechanically
  • B60G21/05—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected mechanically between wheels on the same axle but on different sides of the vehicle, i.e. the left and right wheel suspensions being interconnected
  • B60G21/051—Trailing arm twist beam axles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60G—VEHICLE SUSPENSION ARRANGEMENTS
  • B60G21/00—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces
  • B60G21/02—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected
  • B60G21/04—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected mechanically
  • B60G21/05—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected mechanically between wheels on the same axle but on different sides of the vehicle, i.e. the left and right wheel suspensions being interconnected
  • B60G21/055—Stabiliser bars
• • 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
  • F16F1/14—Torsion springs consisting of bars or tubes
• • 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
  • F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
  • F16F1/366—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers made of fibre-reinforced plastics, i.e. characterised by their special construction from such materials
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60G—VEHICLE SUSPENSION ARRANGEMENTS
  • B60G2200/00—Indexing codes relating to suspension types
  • B60G2200/20—Semi-rigid axle suspensions
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60G—VEHICLE SUSPENSION ARRANGEMENTS
  • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
  • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
  • B60G2206/40—Constructional features of dampers and/or springs
  • B60G2206/42—Springs
  • B60G2206/427—Stabiliser bars or tubes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60G—VEHICLE SUSPENSION ARRANGEMENTS
  • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
  • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
  • B60G2206/70—Materials used in suspensions
  • B60G2206/71—Light weight materials
  • B60G2206/7101—Fiber-reinforced plastics [FRP]

Definitions

• the invention relates to a tubular torsion bar of a motor vehicle.
• the invention more particularly relates to a tubular torsion bar of a motor vehicle comprising a tubular matrix made of a composite material and at least one longitudinal fiber implant embedded in said composite tubular matrix.
• torsion bars of this type are known, known in particular under the name of "sleepers" when they are fixed under a body structure element of the vehicle and implemented in the context of the production of rear axles. , and which are made of composite materials.
• Such torsion bars are used in particular to form trailing arm axle crossarms.
• Document FR-2,954,921 describes and represents a torsion bar or cylindrical composite cross member which connects two longitudinal arms of a vehicle, comprising a matrix of fiberglass and epoxy resin in which fiber implants are embedded. of carbon.
• Such bars have substantially the same strength as conventional steel bars, while being lighter. They are in this particularly advantageous because they can significantly reduce the total pods of the vehicles they equip.
• the characteristics of the composite materials differ significantly from the characteristics of the steel, so that the characteristics of such a bar substantially differ from the characteristics of a steel bar of the same dimensions.
• the invention overcomes this disadvantage by providing a torsion bar of the type described above, the characteristics of which are modified by an opening in said bar.
• the invention proposes a bar of the type described above, characterized in that the bar comprises at least one longitudinal opening whose width and length determine the elastic mechanical characteristics of said bar.
• the opening is delimited radially by edges which are defined by an open angular portion of the bar, with respect to an axis of revolution of the bar,
• the angle of opening of the open angular portion is between 15 ° and 35 °
• the opening extends along a central part of the bar, and said bar comprises two end portions on either side of the central part each having a determined length,
• the cumulative length of the end portions is between 70 and 300 mm
• the bar is composed of a so-called upper half-tube, opposed to the longitudinal opening and comprising exclusively longitudinal glass-fiber implants, and of a lower half-tube, comprising the longitudinal opening, which mainly comprises longitudinal carbon fiber implants,
• the lower half-tube comprises at least one fiberglass implant.
• like reference numerals denote like parts or having similar functions.
• FIG. 1 is a cross-sectional view of a first embodiment of a torsion bar according to the invention
• FIG. 2 is a cross-sectional view of a second embodiment of a torsion bar according to the invention.
• FIG. 3 is a cross-sectional view of a third embodiment of a torsion bar according to the invention.
• FIG. 4 is a perspective view of the torsion bar according to the first embodiment of the invention.
• FIG. 5 is a perspective view of the torsion bar according to the second or third embodiments of the invention.
• FIGS. 4 to 5 show an axially oriented tubular torsion bar 10 "for a motor vehicle (not shown).
• the bar 10 extends substantially transversely to the vehicle and has two opposite ends 12 and 14.
• the bar 10 can be used in the production of a trailing arm rear axle, said arms being attached to the opposite ends 12, 14 of the bar 10.
• the bar 10 is fixed under the vehicle body structure element (not shown)
• the bar 10 in this case is also known as the crossbar.
• the bar 10 comprises a tubular matrix 18 made of a composite material and at least one longitudinal fiber implant 20, 22 which is embedded in said composite tubular matrix 18.
• a torsion bar for this function is made of steel.
• a bar 10 having a composite die 18 has substantially the same strength as a steel bar, while being lighter.
• the characteristics of the composite materials differ substantially from the characteristics of the steel, so that the characteristics, in particular the dynamic characteristics, of such a bar 10 differ substantially from the characteristics of a steel bar of the same strength.
• such a bar 10, comprising a composite matrix 18, may have a higher torsional stiffness, stiffness under higher transverse forces, or roll-induced steering in understeering situations substantially different from the bar in steel she intends to replace.
• the invention overcomes this disadvantage by proposing a torsion bar 10 of the type described above, the characteristics of which are modified by an opening 24 made in said bar 10.
• the invention proposes a bar 10 of the type described above, comprising at least one longitudinal opening 24 of width "e" and length "L".
• the tubular bar 10 may be artificially divided into an upper half-tube 16 and a lower half-tube 26, in an axial longitudinal section through a plane containing the axis "A".
• the longitudinal opening 24 is formed in the lower half-tube 26, opposite the body structure element of the vehicle, the lower half-tube 26 being defined so that the longitudinal opening 24 is arranged towards the bottom.
• the width "e” and the length "L” of the opening 24 determine the elastic mechanical characteristics of said bar 10.
• the opening 24 extends substantially in the longitudinal direction, that is to say parallel to an axis "A" of the tubular bar 10.
• the opening 24 can take different conformations. However, in the preferred embodiment of the invention, as illustrated in FIGS. 1 to 3, the opening is delimited transversely by edges 28, which are defined by an open angular portion of angle "a" relative to an axis "A" of revolution of said bar 10.
• Figures 1 to 3 show radially oriented edges 28, but straight edges could also be envisaged.
• the width "e" which is variable over the thickness of the bar can then be considered as being the width taken at mid-thickness of the bar 10 .
• the opening angle "a" of the open angular portion 28 is substantially between 15 °, as shown in FIGS. 2 and 3, and °, as shown in Figure 1.
• the opening extends along a central portion 30 of the bar 10, and the bar 10 has two end portions 32 which are arranged on either side of the portion
• the purpose of this configuration is to allow a reduction in the rigidity of the stiffness of the bar 10 by varying the length "L” of the single opening 24, the ends of which are then at a distance "D12" respectively. and "Di" ends 12 and 14 each corresponding to the length of the corresponding end portion 32.
• the same values of the "D12" and “Di" distances will be chosen so as to have a symmetrical behavior of the torsion bar 10.
• the cumulative value of distances "D12" and “Di”, representing the length of the end portions 32 is between 70 and 300 mm.
• an opening 24 of reduced length "L” will preferably be associated with a high opening angle "a", the total area of the opening being proportional to the reduction in stiffness sought. .
• a high opening of 35 ° will be associated with an opening whose reduced length "L" corresponds to a cumulative value of "D12" and "Di 4 " of 300 mm. ..
• the upper half-tube 16 exclusively comprises longitudinal fiber implants 20 of glass, and the lower half-tube 26 mainly comprises longitudinal implants 22 made of carbon fibers.
• the lower half-tube 26 may comprise at least one fiberglass implant 20.
• this implant 20 is disposed at the level of the embodiment of the opening, so that in the part actually open, the implant is arranged on either side of the edges 28 of the opening 24.
• This configuration allows to reduce the torsional rigidity of the rod 10.
• a reduced opening of 15 ° associated with an opening of length "L" corresponding to the cumulative value "D12" and "Di" of 70 mm allows to obtain a bar 10 which is less rigid about 15% relative to the bar 10 according to the first embodiment of the invention.
• the upper half-tube 16 comprises five implants 20 in glass fibers, of the same type, dimension, and regularly distributed.
• the lower half-tube 26 comprises four implants 22 made of carbon fiber and a fiberglass implant 20.
• the invention thus makes it possible, by adding a twisting bar 10 of composite material, to vary in a range of values the mechanical characteristics of such a torsion bar 10.

Landscapes

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=50933214

Family Applications (1)

Country Status (3)

Families Citing this family (1)

Family Cites Families (8)

• 2013
  • 2013-12-20 FR FR1363171A patent/FR3015372B1/fr active Active
• 2014
  • 2014-11-24 WO PCT/FR2014/053005 patent/WO2015092183A1/fr active Application Filing
  • 2014-11-24 EP EP14814942.0A patent/EP3083296A1/de not_active Withdrawn

Non-Patent Citations (2)

Also Published As

Similar Documents

Legal Events