Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
  • B62D—MOTOR VEHICLES; TRAILERS
  • B62D65/00—Designing, manufacturing, e.g. assembling, facilitating disassembly, or structurally modifying motor vehicles or trailers, not otherwise provided for
  • B62D65/02—Joining sub-units or components to, or positioning sub-units or components with respect to, body shell or other sub-units or components
  • B62D65/12—Joining sub-units or components to, or positioning sub-units or components with respect to, body shell or other sub-units or components the sub-units or components being suspensions, brakes or wheel units
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
  • B62D—MOTOR VEHICLES; TRAILERS
  • B62D65/00—Designing, manufacturing, e.g. assembling, facilitating disassembly, or structurally modifying motor vehicles or trailers, not otherwise provided for
  • B62D65/02—Joining sub-units or components to, or positioning sub-units or components with respect to, body shell or other sub-units or components
  • B62D65/024—Positioning of sub-units or components with respect to body shell or other sub-units or components

Definitions

• the present invention relates to a device for assisting the assembly of an ar train using such a device.
• Motor vehicles generally include a rear axle fixed under the body, which supports and guides the rear wheels by allowing a travel of the sus pensions.
• a known type of rear axle as a deformable transverse train, presented in particular by document FR-A-2888559, comprises an axle having a general "H" shape, comprising on each side of the vehicle a suspension arm arranged longitu finally.
• the front of the suspension arms is connected to the body of the vehicle by an articulation comprising an elastic connection capable of pivoting along a substantially transverse axis, the rear of these arms supporting the hub of the wheel.
• the central bar of the “H” constitutes a deformable cross member arranged transversely, each end of which is rigidly fixed inside a suspension arm. This deformable transverse maintains the geometry of the suspension arms, while ensuring by a torsional deformation along its axis, the anti-roll bar function which limits the roll angle of the body.
• the vehicle body is supported by suspension springs which are supported on a plate arranged at the rear of each longitudinal suspension arm.
• a telescopic hydraulic shock absorber is installed in parallel with the suspension spring, inside or on the side of this spring.
• a following operation consists in compressing these springs by a pivoting force of the longitudinal suspension arms upwards, around the axes of the front links, which positions the train at a defined height allowing the mounting of the shock absorbers.
• the object of the present invention is in particular to avoid these drawbacks of the prior art.
• this train comprising on each side at least one longi tudinal suspension arm having at one end a connection on the body of this vehicle, and at the other end a support receiving the base of a suspension spring which extends between the train and the chassis of the vehicle, characterized in that it comprises a support on which is mounted at least one compression arm configured to exert a thrust on the longitudinal suspension arm to push the train towards the frame and compress the suspension spring, the end of the compression arm being provided with a sliding surface
• this sliding surface provided at the end of the compression arm of the device according to the invention makes it possible to exert the thrust force, generally vertical, on the train to push the latter towards the chassis while following the kinematics of the train which, linked at one end to the chassis, pivots around this end during the compression of the suspension spring and this, without damaging this train, due to the sliding.
• the compression arm is a telescopic jack and has the sliding surface at its end.
• this surface slide consists of a rolling ball.
• the rolling ball cooperates with a concave complementary surface provided on the rear axle and in which the rolling ball can be housed, which facilitates the sliding of the ball relative to the train during the compression kinematics.
• the device according to the invention further comprises means configured to allow the frame to be held in position, in particular along the X, Y and Z axes to allow the compression arm to effectively compress the spring of suspension up to a point allowing the attachment of the shock absorber for a train with a deformable cross member and the removal of the compression device in the case of a multi-link train.
• the device allows the cross member to be raised to the point of attachment.
• the shock absorber is located on the body and comes to the screwing point by the capping, the compression of the train serving to remove the compression device.
• the invention also relates to a method of assisting the assembly of a rear axle on a vehicle chassis, using a device according to the invention, this train comprising on each side at least one arm of longitudinal suspension having at one end a connection to the chassis of this vehicle, and at the rear a support receiving the base of a suspension spring extending between the train and the chassis of the vehicle, characterized in that '' we mount the train in the open position on the chassis, we install the suspension spring between the chassis and the train, we block the chassis along the X, Y and Z axes, we exert a thrust on the longitudinal suspension arm to push back the train and compress the suspension spring, using a compression arm whose end provided with a sliding surface, exerts a pushing force on the train while following the kinematics of the train during of the compression of the suspension spring, the damping is then fixed eur and the spring compression is released.
• the compression of the spring can take place up to the point of attachment of a damper for the deformable cross member and of the withdrawal of the spring compression device for the multi-arm.
• the device and the method according to the invention make it possible to avoid the risks associated with mounting the compression spring when it is compressed. Furthermore, using a device according to the invention on each side of the chassis, it is possible to perform simultaneous positioning on each side, and furthermore makes it possible to take into account all the springs since the device acts on the train and not on the spring itself. same as well as the two types of rear axle namely multi-arm and deformable cross member.
• FIG. 1 a view from below of the left rear part of a vehicle chassis equipped with a multi-link rear axle and a device according to the invention
• FIG. 2 an enlarged view of Figure 1;
• FIG. 3 a bottom view of the rear right part of a vehicle frame with a rear axle with a deformable cross member and of a device according to the invention
• FIG. 4 a perspective view of the end of a push arm of a device according to the invention.
• FIG. 1 is shown the underside of a vehicle chassis 1 and a mudguard 11, comprising a rear axle 2 which has, for each wheel, a rear transverse arm and a longitudinal suspension arm 3, pivotally mounted by elastic links to the chassis 1 of the vehicle at one of their ends and to the wheel pi vot at their opposite ends.
• a vehicle chassis 1 and a mudguard 11 comprising a rear axle 2 which has, for each wheel, a rear transverse arm and a longitudinal suspension arm 3, pivotally mounted by elastic links to the chassis 1 of the vehicle at one of their ends and to the wheel pi vot at their opposite ends.
• Such a train 2 is further associated with a shock absorber which comprises a rod connected to the frame 1 by an elastic connection and a body integral with the wheel pivot, and a coil spring not coaxial with the shock absorber.
• the chassis 1 of the vehicle is therefore provided with a rear axle 2 fixed above in a so-called open position, which allows the installation of a non-compressed suspension spring between the chassis 1 and the longitudinal arm suspension 3 of said train 2.
• the suspension spring must be compressed.
• the chassis 1 of the vehicle is positioned in height and an assembly aid device according to the invention is installed under the chassis 1.
• This device comprises a support which can be installed under the chassis 1 and on which are means are provided for blocking the frame 1 both along the X, Y and Z axes.
• These means can be constituted by a jack, the rod 7 of which has fixing means 8 on the frame 1 which make it possible to block the chassis 1 along these three axes so that a compression arm 4 of the device can come to bear against the longitudinal suspension arm 3 of the rear axle 2 and push the latter back in order to compress the suspension spring.
• the compression arm 4 consists of the rod of a cylindrical cylinder and has its end a sliding surface formed by a rolling ball 5.
• This jack is preferably resistant to a pressure of one ton to allow the coil spring suspension to be compressed. In this way, when the rolling ball at the end 5 of the compression arm 4 bears against the longitudinal suspension arm 3, said end of the compression arm 4 can follow the kinematics of the longitudinal suspension arm 3 of the train 2.
• the longitudinal suspension arm 3 has a concave surface 6 complementary to the surface of the rolling ball 5 which makes it possible to facilitate the rolling of the ball 5 against the longitudinal suspension arm 3 without friction and therefore without risk of damaging said longitudinal suspension arm 3.
• the holding means 7, 8 are actuated in position of the device according to the invention to come and fix the frame 1 along the X, Y and Z axes and avoid lifting or any displacement of the frame 1 during compression.
• the compression arm 4 is then actuated which abuts against the longitudinal suspension arm 3 at the level of the concave surface 6 so that the rolling ball 5 is housed in the concave surface 6 and can push the longitudinal suspension arm back. 3 along the z axis. Due to the pivoting attachment of the longitudinal suspension arm 3 to the chassis 1, the vertical movement along the z axis produces a pivoting around the attachment which causes kinematics of the longitudinal suspension arm 3 of the train 2 during compression of the suspension spring that the rolling ball 5 will see follow.
• the sliding surface consisting of the ball 5 makes it possible to accept the variation in position of the longitudinal suspension arm 3 during compression without the risk of damaging this arm 3.
• This compression therefore makes it possible to bring the coil spring suspension until the shock absorber can be fixed.
• the compression is then released to the last feature of the device according to the invention.
• the device according to the invention therefore makes it possible to mount different types of rear axle, such as those with a deformable cross member and those with multiple arms. For both types, it is thus possible to compress the arms of the rear axles equipped with the springs with the device while at the same time accepting the variation in position of the arms during compression.
• all types of spring can be taken into account, regardless of the size variation.

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• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Transportation (AREA)
• Mechanical Engineering (AREA)
• Vehicle Body Suspensions (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=73013472

Family Applications (1)

Country Status (3)

Family Cites Families (4)

• 2020
  • 2020-04-14 FR FR2003693A patent/FR3109135A1/fr active Pending
• 2021
  • 2021-03-10 EP EP21715947.4A patent/EP4136015A1/de not_active Withdrawn
  • 2021-03-10 WO PCT/FR2021/050402 patent/WO2021209695A1/fr not_active Ceased

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