WO2017158535A1 - Transverse d'ensemble essieu pour un véhicule utilitaire léger - Google Patents

Transverse d'ensemble essieu pour un véhicule utilitaire léger Download PDF

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Publication number
WO2017158535A1
WO2017158535A1 PCT/IB2017/051510 IB2017051510W WO2017158535A1 WO 2017158535 A1 WO2017158535 A1 WO 2017158535A1 IB 2017051510 W IB2017051510 W IB 2017051510W WO 2017158535 A1 WO2017158535 A1 WO 2017158535A1
Authority
WO
WIPO (PCT)
Prior art keywords
cross member
single body
rib
axis
transverse
Prior art date
Application number
PCT/IB2017/051510
Other languages
English (en)
Inventor
Davide FERRARIO
Silvia CECCHEL
Robert Eduard GOLIMBIOSCHI
Original Assignee
STREPARAVA S.p.A. CON SOCIO UNICO
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 STREPARAVA S.p.A. CON SOCIO UNICO filed Critical STREPARAVA S.p.A. CON SOCIO UNICO
Priority to EP17721832.8A priority Critical patent/EP3429908A1/fr
Priority to CN201780016555.7A priority patent/CN109070938A/zh
Publication of WO2017158535A1 publication Critical patent/WO2017158535A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
    • B62D21/11—Understructures, i.e. chassis frame on which a vehicle body may be mounted with resilient means for suspension, e.g. of wheels or engine; sub-frames for mounting engine or suspensions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D29/00—Superstructures, understructures, or sub-units thereof, characterised by the material thereof
    • B62D29/008—Superstructures, understructures, or sub-units thereof, characterised by the material thereof predominantly of light alloys, e.g. extruded

Definitions

  • the invention relates to a cross member for an axle assembly for a light commercial vehicle, to said axle assembly and to a process for the production of the cross member.
  • the axle assembly of a light commercial vehicle currently comprises a cross member, two suspensions and hub assemblies articulated to the cross member by means of the respective suspensions.
  • the cross member of the axle assembly of the light commercial vehicle is manufactured by welding a plurality of pieces of pressed and/or bent sheet metal. Finally, the cross member is subjected to cataphoresis and painting operations as well as to other possible machining processes .
  • a drawback of the prior art lies in the fact that these cross members are very heavy, with a weight that increases as the need to resist impacts, strains and stresses becomes stronger. This leads to a significant fuel consumption of the respective commercial vehicle.
  • An object of the invention is to provide a cross member that reduces the drawback of the prior art.
  • a cross member of an axle assembly for a light commercial vehicle comprising a single body extending along an axis transverse to a direction of travel of the axle assembly; the single body being produced in an aluminium- silicon alloy as one piece by means of a casting process, preferably at high pressure; the single body comprising a first structure having a closed section, preferably the first closed section is hollow.
  • the cross member made of aluminium has a high resistance to impacts, strains and stresses, though with a low weight.
  • the single body comprises a second structure having a closed section, preferably aligned with the first structure transverse to the first axis, in particular perpendicularly .
  • the first and the second structure are connected to each other by means of a first ribbing obtained in the single body, preferably the first ribbing extends transverse to the first axis, in particular perpendicularly .
  • the single body comprises a first rib connected to the first section by means of a second ribbing, preferably transverse to the first axis, in particular perpendicular .
  • the cross member comprises a first portion of the single body having a portion of the first structure and a portion of the first rib and being connected to each other by means of the first ribbing.
  • the cross member comprises a second portion of the single body having a portion of the first structure and a portion of the second structure with a closed section and connected to each other by means of a connecting section or the second ribbing.
  • the single body comprises a third structure with a closed section having a dimension transverse to the axis greater than a dimension transverse to the axis of the first structure, the dimensions being preferably perpendicular to the axis.
  • the single body comprises a fourth structure with a closed section, which in use is arranged above the third structure with a closed section.
  • the single body comprises a central sector and two lateral sectors that extend from the central sector on opposite sides.
  • the central sector comprises the first portion and the second portion.
  • the single body comprises a second rib which in use is facing the ground and is preferably parallel to the axis; and a plurality of ribbings that extend transverse to the axis from the second rib and wherein at least one of the plurality of ribbings forms an angle with the second rib between 60° and 120°, preferably between 75° and 105°.
  • the plurality of ribbings form respective angles with second rib between 60° and 120°, preferably between 75° and 105°.
  • Another object of the invention is to provide an axle assembly that can reduce the drawbacks of the prior art.
  • an axle assembly comprising:
  • each suspension comprises:
  • Another object of the invention is to provide a production process of a cross member of an axle assembly.
  • a production process of a cross member of an axle assembly comprising a step of casting, preferably at high pressure, with an aluminium-silicon alloy and a step of producing carriages for producing at least one structure with a hollow section of the cross member .
  • the process comprises the step of producing a casting die that defines the ribbings of the cross member that extend from a second rib of the cross member; arranging the casting gates in proximity of the second rib; and wherein the two processes comprise the step of arranging the casting gates and/or defining the ribbings so that an angle formed between one of the casting gates and one of the ribbings is between 150° and 210°, preferably between 165°and 195° .
  • the casting process is performed at high pressure and under vacuum.
  • the production process comprises the step of producing the cross member in a single body.
  • FIG. 1 is a front view of a cross member for an axle assembly according to the invention
  • FIG. 2 is a front view with sectional parts and with a lateral carriage used for a step of the cross member production process;
  • figure 3 is a cross section view according to plane III-III of figure 1 ;
  • FIG. 4 is a cross section view according plane IV-
  • FIG. 5 is a cross section view according plane V-V of figure 1.
  • number 1 indicates a cross member of an axle assembly for a light commercial vehicle.
  • the axle assembly (not shown in the accompanying figures) comprises the cross member 1 extending along an axis Al transverse to a direction of travel V of the light commercial vehicle; two suspensions (not shown) ; two hub assemblies (not shown) articulated to the cross member 1 by means of the respective suspensions; and a steering system (not shown) arranged along the cross member 1 and connected to the two hub assembly so as to steer the hub assemblies.
  • the cross member 1 comprises a single body 2, which extends along the axis Al and is manufactured as one single piece by means of a casting process, preferably die casting. In other words, the cross member 1 is formed by one single piece.
  • the single body 2 is made of an aluminium-silicon alloy. Furthermore, the cross member 1 is symmetrical relative to a symmetry plane P, which is perpendicular to the axis Al .
  • the single body 2 has a central sector 3 and two lateral sectors 4, which extend towards opposite sides of the central sector 3 and partly transversely to the axis Al .
  • the two lateral sectors 4 are arranged at the ends of the central body 3 on opposite sides.
  • the cross memberl has through holes 5, in particular two upper through holes 5 and two lower through holes 5, which are configured for the attachment of the suspensions.
  • the upper through holes 5 are obtained on the lateral sectors 4 transversely to the axis Al, in particular perpendicularly to the axis Al and parallely to the direction of travel.
  • the lower through holes 5 are obtained between the central sector 3 and the respective lateral sectors 4.
  • the suspensions are connected to the cross member 1, in particular to the lateral sectors 4 of the cross member 1 by means of the through holes 5.
  • the cross member 1 comprises through holes 6 having a smaller diameter than the through holes 5 and configured for the attachment of the steering system.
  • the through holes 6 are obtained in the central sector 3 transversely to the axis Al, in particular perpendicularly to the axis Al and parallely to the direction of travel.
  • the hydraulic steering system is connected to the cross member 1, in particular to the central sector 3 of the cross member 1 by means of the through holes 6.
  • the central sector 3 is symmetrical relative to the symmetry plane P and comprises an upper rib 10, which extends along the central sector 3 connecting the lateral sectors 4 to each other, and two structures 11, which have a closed section and are symmetrical to each other relative to the plane P.
  • Each structure 11 extends from the plane P towards the respective lateral sector 4. Furthermore, the two structures 11 are connected to each other along the plane P.
  • the central sector 3 comprises two structures 12, which have a closed section and are symmetrical to each other relative to the plane P.
  • the two structures 12 are spaced apart from one another and are adjacent to the respective lateral sector 4.
  • the structures 11 are located under the structures 12. In other words, in use, the structures 11 are closer to the ground than the structures 12.
  • the central sector 3 has a lower rib 17, which is arranged along a lower side of the structures 11.
  • a lower rib 17 which is arranged along a lower side of the structures 11.
  • one of the sides of the structures 11 that faces the outside of the cross member 1 defines the lower rib 17.
  • the lower rib 17, in use, is adjacent to the ground and is arranged on the opposite side of the cross member 1 relative to the upper rib 10.
  • the lower rib 17 extends between the lower holes 5 and fulfils the structural function of distributing the loads on the lower holes 5 along the entire central sector 3.
  • the central sector 3 comprises a plurality of ribbings 15, which connect the structure 11 to the upper rib 10. More in detail, a group of the plurality of ribbings 15 extend from the lower rib 17 to the upper rib 10. In particular, said ribbings of said group of the plurality of ribbings 15 extend, along a first portion, on the side of the lower structures 11 and, along a second portion, from respective upper walls 11a of the lower structures 11 to the upper rib 10. Furthermore, another group of the plurality of ribbings 15a extend from the upper wall 11a of the lower structure 11 to the upper rib 10.
  • the central sector 3 comprises two ribbings 16, which connect the structure 11 to the structure 12.
  • the single body 2 comprises a connecting section 18, which connects the structure 11 to the structure 12. More in detail, figure 3 shows a section of a portion 21 of the central sector 3, where there are the structure 11 having the closed section, the structure 11 having the closed section and the connecting section, which connects the closed section of the structure 11 to the closed section of the structure 12.
  • the connecting section 18 is open and its cross section is substantially C-shaped. Furthermore, in use, the connecting section 18 houses the fixing means to fix the steering system to the cross member 1.
  • one of the upper sides of the closed section of the structure 12 defines a portion of the upper rib 10.
  • an outer side of the closed section of the structure 12 defines a portion of the upper rib 10.
  • the outer side of the closed section of the structure 12 is the farthest side of the structure 12 from the lower rib 17.
  • the connecting section 18 comprises a portion that is transverse to the axis Al, in particular perpendicular.
  • one of the upper sides of the structure 12 defines a portion of the upper rib 10.
  • the upper side is farthest from the lower rib 17 of the sides of the structures 12.
  • the ribbing 16 is transverse to the axis Al, in particular perpendicular .
  • each lateral sector 4 comprises a structure 24 with a closed section having a dimension Dl transverse to the axis Al that is greater than a dimension D2 transverse to the axis Al of the structure 11 and than a dimension D3 transverse to the axis Al of the structure 12.
  • the dimension Dl of the structure 24 is greater than the sum of the dimension D2 of the structure 11 and the dimension D3 of the structure 12.
  • the dimensions are preferably perpendicular to the axis Al .
  • each lateral sector 4 comprises a structure 25 having a closed section.
  • the structure 24 and the structures 25 are connected by means of a bracket 26, which is solid and has a thickness that is approximately equal to twice the thickness of the ribbing 16.
  • the thickness of the bracket 26 is approximately equal to twice the thickness of the ribbing 15.
  • the thickness of the bracket 26 is approximately equal to twice the thickness of the walls of the structure 11.
  • the structure 25 is arranged, in use, above the structure 24. In other words, the structure 25 is farther from the lower rib 17 than the structure 24. In other words, in use, the structure 25 is farther from the ground than the structure 24.
  • the bracket 26 houses, in use, a bounce buffer 26a, which limits the stroke of suspension connected to the hole 5 downwards.
  • the cross member 1 comprises a seat 26b, which houses an upper buffer, which limits the stroke of the suspension connected to the hole 5 upwards.
  • the cross member 1 comprises ribbings 27 around the seat 26b.
  • the upper holes 5 are made in the structure 25 and the lower holes 5 are made in the structure 24.
  • the suspensions are partly housed inside the respective structures 24 and 25.
  • the structures 11, 12, 24 and 25 are hollow.
  • the thicknesses of the walls of the structures 11, of the structures 12, of the ribbings 15, of the ribbings 16 and of the connecting section 18 approximately have the same dimensions; in other words, the thicknesses have dimensions that differ from each other by less than 30%, preferably less than 15%.
  • the structure 11 is part of the single body 2.
  • the structure 12 is part of the single body 2.
  • the structure 24 is part of the single body 2.
  • the structure 25 is part of the single body 2.
  • the plurality of ribbings 15 are part of the single body 2.
  • the ribbings 16 are part of the single body 2.
  • the connecting section 18 is part of the single body
  • the bracket 26 is part of the single body 2.
  • the ribs 10 and 17 are part of the single body 2.
  • the ribbings 27 are part of the single body 2.
  • the cross member 1, with the exception of the bounce buffer, is entirely made in the single body 2, which is one single piece of the primary aluminium- silicon alloy.
  • the broken lines show the casting gates 30, which are used during the production process of the cross member 1.
  • figure 2 shows the carriages 31, which are used during the production process to manufacture the structures 11, 12, 24 and 25.
  • the production process of the cross member 1 comprises the steps of:
  • the production process further comprises the step of manufacturing the cross member in a single body 2.
  • the casting process is performed at high pressure, namely it is a die casting process carried out at a pressure greater than 100 bar and under vacuum.
  • the casting process is performed at low pressure, namely at a pressure ranging from 0.2 bar to 1 bar and under vacuum.
  • the casting process is carried out at a controlled pressure.
  • the casting process is performed at high pressure, namely by means of die casting, or at low pressure without the aid of the vacuum.
  • axle assembly can be subjected to changes and variations, without for this reason going beyond the scope of protection of the appended claims .

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Structural Engineering (AREA)
  • Body Structure For Vehicles (AREA)
  • Vehicle Body Suspensions (AREA)

Abstract

L'invention concerne une transverse d'ensemble essieu pour un véhicule utilitaire léger. La traverse (1) comprend : un corps monobloc (2) s'étendant le long d'un axe (Al) transversal à une direction de déplacement (V) de l'ensemble essieu (1) ; le corps monobloc (2) étant fait en un alliage aluminium-silicium d'un seul tenant selon un procédé de coulée, de préférence à haute pression ; le corps monobloc (2) comprenant une première structure (11, 24) ayant une section fermée, la première structure (11, 24) étant de préférence creuse.
PCT/IB2017/051510 2016-03-15 2017-03-15 Transverse d'ensemble essieu pour un véhicule utilitaire léger WO2017158535A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP17721832.8A EP3429908A1 (fr) 2016-03-15 2017-03-15 Transverse d'ensemble essieu pour un véhicule utilitaire léger
CN201780016555.7A CN109070938A (zh) 2016-03-15 2017-03-15 用于轻型商用车的车轴组件的横向构件

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102016000027157 2016-03-15
ITUA2016A001695A ITUA20161695A1 (it) 2016-03-15 2016-03-15 Una traversa di un gruppo assale per un veicolo commerciale leggero

Publications (1)

Publication Number Publication Date
WO2017158535A1 true WO2017158535A1 (fr) 2017-09-21

Family

ID=56203729

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2017/051510 WO2017158535A1 (fr) 2016-03-15 2017-03-15 Transverse d'ensemble essieu pour un véhicule utilitaire léger

Country Status (4)

Country Link
EP (1) EP3429908A1 (fr)
CN (1) CN109070938A (fr)
IT (1) ITUA20161695A1 (fr)
WO (1) WO2017158535A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0779204A1 (fr) * 1995-12-11 1997-06-18 Volkswagen Aktiengesellschaft Châssis auxiliaire comprenant le boîtier en fonte d'alliage léger d'une direction à crémaillère
EP1270374A2 (fr) * 2001-06-29 2003-01-02 Sistemi Sospensioni S.p.A. Traverse pour la suspension d'un véhicule automobile
DE102012213663A1 (de) * 2012-08-02 2014-02-06 Zf Friedrichshafen Ag Getriebeträger
US20160068189A1 (en) * 2013-04-26 2016-03-10 Honda Motor Co., Ltd. Vehicle subframe

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7837230B2 (en) * 2003-10-20 2010-11-23 Magna International Inc. Hybrid component
DE112010002862A5 (de) * 2009-07-06 2012-11-29 Ksm Castings Gmbh Achsträger, insbesondere Vorderachsträger für Kraftfahrzeuge
DE102011115387A1 (de) * 2010-11-02 2012-05-03 Ksm Castings Gmbh Achsträger, insbesondere Vorderachsträger für Kraftfahrzeuge
BR112015001506A2 (pt) * 2012-07-27 2017-07-04 Honda Motor Co Ltd subarmação para veículo

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0779204A1 (fr) * 1995-12-11 1997-06-18 Volkswagen Aktiengesellschaft Châssis auxiliaire comprenant le boîtier en fonte d'alliage léger d'une direction à crémaillère
EP1270374A2 (fr) * 2001-06-29 2003-01-02 Sistemi Sospensioni S.p.A. Traverse pour la suspension d'un véhicule automobile
DE102012213663A1 (de) * 2012-08-02 2014-02-06 Zf Friedrichshafen Ag Getriebeträger
US20160068189A1 (en) * 2013-04-26 2016-03-10 Honda Motor Co., Ltd. Vehicle subframe

Also Published As

Publication number Publication date
CN109070938A (zh) 2018-12-21
ITUA20161695A1 (it) 2017-09-15
EP3429908A1 (fr) 2019-01-23

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