WO2009072937A1 - Dispositif de répartition de charge - Google Patents

Dispositif de répartition de charge Download PDF

Info

Publication number
WO2009072937A1
WO2009072937A1 PCT/SE2007/001087 SE2007001087W WO2009072937A1 WO 2009072937 A1 WO2009072937 A1 WO 2009072937A1 SE 2007001087 W SE2007001087 W SE 2007001087W WO 2009072937 A1 WO2009072937 A1 WO 2009072937A1
Authority
WO
WIPO (PCT)
Prior art keywords
load sharing
link
rod
axle
sharing arrangement
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/SE2007/001087
Other languages
English (en)
Inventor
John NORDSTRÖM
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.)
Volvo Truck Corp
Original Assignee
Volvo Lastvagnar AB
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 Volvo Lastvagnar AB filed Critical Volvo Lastvagnar AB
Priority to PCT/SE2007/001087 priority Critical patent/WO2009072937A1/fr
Publication of WO2009072937A1 publication Critical patent/WO2009072937A1/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
    • B60G5/00—Resilient suspensions for a set of tandem wheels or axles having interrelated movements
    • B60G5/04—Resilient suspensions for a set of tandem wheels or axles having interrelated movements with two or more pivoted arms, the movements of which are resiliently interrelated, e.g. the arms being rigid
    • 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
    • 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
    • B60G2204/421—Pivoted lever mechanisms for mounting suspension elements, e.g. Watt linkage
    • 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
    • B60G2204/80—Interactive suspensions; arrangement affecting more than one suspension unit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2400/00—Indexing codes relating to detected, measured or calculated conditions or factors
    • B60G2400/60—Load
    • B60G2400/61—Load distribution

Definitions

  • the present invention relates to a load sharing arrangement for balancing vertical forces acting on a first wheel axle and a second wheel axle of a vehicle.
  • the invention also relates to a vehicle provided with such a load sharing arrangement.
  • Some heavy vehicles have two steered front wheel axles, where the wheels on each axle are coupled to the steering system of the vehicle.
  • these front axles will experience different loads.
  • the cargo load of the vehicle may cause an inclination of the vehicle frame, again resulting in different load on each front wheel axle.
  • JP08118930 discloses a front axle load sharing system in which a first laminated spring onto which a first front axle is mounted, is connected to a connection rod through a first lever member.
  • the outer end of the connecting rod is coupled to a second laminated spring onto which a second front axle is mounted through a second lever member that supports.
  • Up and down motion of the first front axle is converted by the first lever member into push and pull motion of the connecting rod.
  • This push and pull motion is converted by the second lever member into an opposite motion of the second axle. In this way, a portion of the load from the first front axle is transferred to the second front axle.
  • connection rod needs to engage the lever member at a distance from their pivoting points, in order to create a lever. This in turn requires additional space for the connecting rod.
  • each lever member operates by means of two levers (one connected to the connection rod, and one connected to the spring), there is a complex non-linear relationship between the position of the spring and the transfer of force.
  • the present invention relates to load sharing between a first and a second wheel axles of a vehicle, each axle being supported by at least two spring members extending in a longitudinally direction of said vehicle, each spring member being pivotally mounted in a first end, and vertically movably suspended in a second end.
  • a first aspect of the invention relates to a load sharing arrangement comprising a first link member pivotable in reponse to vertical forces acting on said first axle, a second link member pivotable in reponse to vertical forces acting on said second axle, and a force transmission element connected to transfer forces between the pivotable link members in order to balance vertical forces acting on the first and second wheel axles, wherein the force transmission element is a rotatably arranged rod.
  • the invention is based on the realization that it is advantageous to transfer forces between the pivoting link memers by means of a rotatatable rod.
  • the present invention can advantageously provide load sharing between two steered axles of a vehicle, for example two steered front wheel axles, as it provides load sharing between corresponding ends (e.g. the rear ends) of the spring members.
  • the invention may also be applied to non-steered axles, or between a steered axle and a non-steered axle.
  • the rotatable rod does not need to be vertically displaced from a pivoting point of the link member, but can engage the link member directly at its pivoting point. In this way, the force transfer can be effected in a more space economic fashion, without the need for any longitudinal movement and extra space above or under the link member. Thus, a greater degree of freedom regarding dimensioning and planning of the vehicle is accomplished. Further, each link member will only require one lever, acting between the link member and the wheel axle (typically via a spring member, suspending the axle). This simplifies the relationship between force transfer and spring position and thus an improved axle load distribution is achieved.
  • the first link member pivotally connectable in a first end to the second end of a spring member of the first front axle and in a second end to the frame
  • a second link member pivotally connectable in a first end to the second end of a spring member of the second front axel and in a second end to the frame, and a force transmission element adapted to balance vertical forces acting on each link member.
  • the link members are preferably adapted to engage said rotatable rod so as to transform a pivoting motion of each link member to a rotational movement of said rod, and vice versa, in order to balance forces acting on the spring members.
  • the arrangement is preferably designed so that a clock wise pivoting motion of said first link member is converted to a clock wise pivoting motion of the second link member. This allows for an asymmetrical arrangement of the link members, e.g. both extending away from the rotatable rod.
  • the link members can therefore be adapted to engage the rotatable rod on opposite sides of a centreline of the rod in order to ensure the desired motion.
  • Each link member may be arranged to engage the rotatable rod at a horizontal distance from a point of connection between said link member and said spring member, along the axis of rotation of the link member. This allows mounting the rotatable rod at a distance from the spring members, which may be advantageous due to restricted space immediately above the spring members. Note that the use of rotational force avoids the creation of an additional lever when moving the point of engagement away from the connection between link member and spring member.
  • the rotatable rod is provided with meshing gears in each end of the rod, and each link member is provided with meshing gears formed to engage the meshing gears in one end of the rotatable rod.
  • Meshing gears are a simple and effective way to achieve the engagement between link member and rotatable axle, which is cost effective and requires little space.
  • Various types of meshing gears may be used to provide the desired force transfer, and possible solutions include bevelled gear wheels. Bevelled gear wheels make it possible to transfer a movement from the rotatable axle directly to the horizontal axle positioned perpendicular to the rotatable axle. Hence, by this way a compact configuration of the load sharing arrangement is achieved.
  • each link member comprises a link arm which is pivotable in a first end around a horizontal axis fixed in relation to the frame, and a suspension member, pivotally connected in a first end to a second end of the link arm, and pivotally connected in a second end to the second end of the spring member.
  • Such a link member provides the required freedom for the spring member, while allowing transfer of force from the rotatable rod.
  • the link member can further comprise meshing gears fixedly connected to said link arm and having an axis of rotation coinciding with the horizontal axis.
  • the rotatable rod can then engage the meshing gears, in turn forcing the link arm to pivot, thereby transferring the force to the suspension member and further to the spring member.
  • the meshing gears can be connected to the link arm by an axle. This axle can then be received by a hole in the frame or other support structure, thus providing the pivoting arrangement of the link arm.
  • the rotatable rod comprises two separate portions, which are independently rotatable and lockable in a plurality of different relative positions.
  • An actuator can be arranged to effect such adjustments, making it possible to automatically adjust the driving height.
  • a torsion spring or damper can be arranged between the two rod portions, to thereby give a better comfort at low road excitations, when the spring members themselves are more stiff.
  • Fig. 1 shows schematically a portion of a vehicle having two steered front wheel axles.
  • Fig. 2 shows a load sharing arrangement according to prior art.
  • Fig. 3 shows a load sharing arrangement according to an embodiment of the present invention.
  • Fig. 4 shows a perspective view of the arrangement in fig. 3.
  • Fig. 5 shows schematically a portion of a vehicle equipped with the load sharing arrangement of figure 3 and 4.
  • Fig. 6 shows a load sharing arrangement according to a further embodiment of the present invention.
  • Fig. 7 shows a load sharing arrangement according to a further embodiment of the present invention.
  • the vehicle illustrated in figure 1 has two front beam axles 1a, 1 b, each supporting two front wheels 2.
  • Each beam axle 1a, 1b is bolted to two spring members 3, here leaf springs, extending in the longitudinal direction of the vehicle.
  • the springs are in turn mounted to the frame of the vehicle, here illustrated as two longitudinal frame members.
  • each spring 3 is pivotally mounted in one end 3a, and suspended by a shackle 4 in the other end 3b.
  • a damper 5 is arranged to each spring member, to reduce the spring movement.
  • the shackle 4 is arranged in the rear end 3b of each spring member 3.
  • Each wheel is arranged on a steering joint 23, which is operated by a steering arm 24 connected via a link arm 25 to a pitman arm 26a, 26b.
  • the front pitman arm 26a is operated by a steering gear controlled by the steering wheel 27.
  • the rear pitman arm 26b is connected to the front pitman arm 26a via a relay rod 28, so as to synchronize the steering of the front and rear wheels.
  • the steering of the wheels on each axle is synchronized by a track rod 29.
  • a load sharing arrangement may be arranged to balance an increased force on one front wheel axle to the other front wheel axle.
  • FIG. 2 schematically shows such a load sharing arrangement according to prior art.
  • the shackles 4 of each leaf spring 3 is connected to a lever 6, pivotally arranged around a pivoting point 6c and connected in one end 6a to the shackle 4.
  • the free ends 6b of corresponding levers 6 are connected by a force transmission element 7 in the form of a rod arranged to move back and forth in the longitudinal direction of the vehicle, which rod thereby can transfer forces between the levers.
  • Figures 3 and 4 show a load sharing arrangement according to an embodiment of the present invention.
  • the front ends 31a, 32a of each spring member 31 , 32 is pivotally mounted to the frame 9 of the vehicle.
  • the rear end 31b, 32b of each spring member 31 , 32 is further supported by a link member 10a, 10b which is pivotally arranged around an axis A that is fixed in relation to the frame.
  • a force transmission element 11 is connected between the link members of two spring members.
  • the force transmission element is a rotatable rod, which is arranged to engage the link members to transmit a pivoting movement of one link member 10a to a pivoting movement of the other link member 10b via a rotational movement of the rod 11.
  • a geometric pivot axis of the first link member 10a and the geometric rotation axis of the rod 11 are preferably substantially perpendicular relative to each other.
  • a geometric pivot axis of the second link member 10b and the geometric rotation axis of the rod 11 are preferably substantially perpendicular relative to each other.
  • the geometric pivot axes of the link members 10a, 10b are preferably substantially parallel to each other, and the geometric pivot axes of the link members 10, 10b can be arranged in parallel with the wheel axle direction.
  • the rod is rotatable around its longitudinal axis and can be arranged essentially in the longitudinal direction of the vehicle, i.e. essentially perpendicular to the wheel axles.
  • the link members act as cradles that transfer a rotational moment to a vertical force acting on the spring member and further onto the wheel axle. As indicated in figures 3 and 4, a force B acting upwards on the front spring member 31 will create a rotational moment C on the rod 11 , and finally a force D acting downwards on the rear spring member 32.
  • each link member 10a, 10b comprises a pivoting link arm 12a, 12b.
  • the link arm is formed with a hole adapted to receive an axle or pin extending from the frame or a support mounted to the frame.
  • the link member 10a, 10b further comprises a shackle 13 connected in one end to the spring member 31 , 32, and in the other end to the link arm 12a, 12b, at a distance from the axis A.
  • the engagement between the rod and the link members can be provided by suitable meshing gears.
  • meshing gears 14 having an axis of rotation coinciding with the axis A are integrally formed with each link arm 12a, 12b.
  • the link arm 12a, 12b and meshing gears 14 may be molded in one piece, or be attached to each other by means of suitable fasteners or welding.
  • Corresponding meshing gears 15 are provided on each end of the rod 11 , so that rotation of the rod can be converted to pivoting of the link arms 12a, 12b.
  • gear wheels 14, 15 are used. Note that it may not be necessary to provide complete gear wheels, having gear teeth all around 360 degrees. In fact, the expected rotation of the rod is normally quite limited, and the gear wheels 14, as well as the gear wheels 15, may be formed as sectors of complete wheels. In the example illustrated in figure 3, the gear wheels 14 on the link members 10a, 10b are 180 degree sectors of complete gear wheels.
  • the load share arrangement In order to balance forces, the load share arrangement must be arranged so that an upwards motion of one spring member is transferred to a downwards motion of the other spring member.
  • the link arms of the first and second spring members are arranged symmetrically, i.e. they are connected to their respective spring member 3 on different sides of their respective pivoting axis A.
  • the link arms 12a, 12b In other words, in order to move the first spring member 31 in one direction (e.g. upwards, arrow B), and the second spring member 32 in a different direction (e.g. downwards, arrow D), the link arms 12a, 12b must be rotated in the same direction (e.g. clock wise) around the axis A.
  • the gear wheels 14 of each link member 12a, 12b are preferably arranged to engage the gear wheels 15 on opposite sides of the centre axis of the rod 11.
  • Figure 5 shows a vehicle provided with the load sharing arrangement in figures 3 and 4.
  • the point of engagement between the rod and the link members is moved sideways, here in a direction under the vehicle.
  • the link member gear wheel 14 is here connected to the link arm 12a, 12b via an axle 16, which is pivotally arranged in a hole 17 in the frame or a support mounted to the frame.
  • the rod 11 engages the gear wheels 14 in the same way as in figure 3, but at a position sideways separated from the link arms 12a, 12b.
  • the entire rod 11 can be mounted at a horizontal distance from the spring member, where may be advantageous from a design perspective.
  • the gear wheels 14 also in this arrangement are arranged on different sides of the rod 11.
  • Figure 7 illustrates a further embodiment of the invention, according to which the rotatable rod comprises two individually rotatable portions 11a, 11 b.
  • the portions are lockable in different relative positions, here by means of a sliding sleeve 18 adapted to engage splines 19 on each rod portion 11a, 11b.
  • the relative position of the link members can be adjusted by releasing the sleeve, rotating the rod portions in relation to each other, and then replacing the sleeve.
  • suitable actuating means 20 such as stepping motors or hydraulic actuators.
  • a torsion spring or damper 21 can be arranged between the rod portions.

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

Abstract

Dispositif de répartition de charge pour véhicule doté d'un châssis, d'un premier essieu et d'un deuxième essieu, le dispositif comportant un premier organe de liaison susceptible de pivoter en réponse à des efforts verticaux agissant sur le premier essieu, un deuxième organe de liaison susceptible de pivoter en réponse à des efforts verticaux agissant sur le deuxième essieu, et un élément de transmission d'efforts monté de façon à transférer des efforts entre les organes de liaison pivotants afin d'équilibrer les efforts verticaux agissant sur le premier et le deuxième essieu, l'élément de transmission d'efforts étant une barre disposée de façon tournante. La présente invention est capable d'assurer avantageusement la répartition de la charge entre deux essieux directeurs d'un véhicule, par exemple deux essieux directeurs avant, car elle assure la répartition de la charge entre des extrémités correspondantes (par ex. les extrémités arrière) des éléments de ressorts.
PCT/SE2007/001087 2007-12-06 2007-12-06 Dispositif de répartition de charge Ceased WO2009072937A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/SE2007/001087 WO2009072937A1 (fr) 2007-12-06 2007-12-06 Dispositif de répartition de charge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE2007/001087 WO2009072937A1 (fr) 2007-12-06 2007-12-06 Dispositif de répartition de charge

Publications (1)

Publication Number Publication Date
WO2009072937A1 true WO2009072937A1 (fr) 2009-06-11

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Family Applications (1)

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PCT/SE2007/001087 Ceased WO2009072937A1 (fr) 2007-12-06 2007-12-06 Dispositif de répartition de charge

Country Status (1)

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WO (1) WO2009072937A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103101415A (zh) * 2011-11-14 2013-05-15 北汽福田汽车股份有限公司 一种连杆随动平衡悬架机构及包括该机构的汽车
WO2015054760A1 (fr) * 2013-10-17 2015-04-23 Volvo Do Brasil Veículos Ltda. Liaison anti-vibration pour timonerie de direction à deux essieux directeurs

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08118930A (ja) * 1994-10-24 1996-05-14 Mitsubishi Motors Corp 前二軸車の懸架装置

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08118930A (ja) * 1994-10-24 1996-05-14 Mitsubishi Motors Corp 前二軸車の懸架装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103101415A (zh) * 2011-11-14 2013-05-15 北汽福田汽车股份有限公司 一种连杆随动平衡悬架机构及包括该机构的汽车
WO2015054760A1 (fr) * 2013-10-17 2015-04-23 Volvo Do Brasil Veículos Ltda. Liaison anti-vibration pour timonerie de direction à deux essieux directeurs

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