FR3051158A1 - DEVICE FOR DAMPING A SEAT OF A MOTOR VEHICLE BY SPRINGS. - Google Patents

Abstract

A device (3) for damping a vehicle seat comprising a frame (5), the device comprising: - a lower tub (18), mounted on the frame and comprising a plurality of slots (26); - An upper bucket (19), mounted in translation with the lower bucket between an initial position and a load position, the upper bucket comprising a plurality of fasteners (30) slidable in the slots; a plurality of springs (32) arranged between the lower tub and the upper tub, the upper tub and the lower tub comprising respectively a plurality of primary bosses (33) and secondary bosses (35), so as to put in place and maintain in position each spring.

Description

DEVICE FOR DAMPING A SEAT OF A MOTOR VEHICLE BY SPRINGS.

The invention relates to the field of motor vehicles. It relates, more specifically, the depreciation of a motor vehicle seat.

The road behavior of a vehicle directly affects the comfort of occupants to the front seats, and comfort is also related to safety, and therefore to the health of the occupants.

[0003] Uncomfortable seats increase the irritation and fatigue of a driver, and prolonged postural stress can cause lower back problems. This damage is aggravated by the vibrations transmitted by the vehicle to the occupants.

If in the automotive field vibration amplitudes transmitted remain relatively low, it is not the same for industrial machinery. In this field, the transmitted vibrations are of high amplitude and constitute a real problem for the health of the operators.

A vehicle seat is conventionally composed of a frame supporting the seat, and this frame, in direct contact with the vehicle base, is sensitive to all the vibrations generated by the vehicle's road behavior, these vibrations being transmitted by the underbody to the frame of the seat.

Seats to overcome the drawbacks mentioned above have been proposed, and are for example used for trucks or tractors.

However, the size of such seats does not allow their implementation in other types of vehicles, including automobiles.

EP 28671 13 discloses a device for damping a seat comprising a frame, the device comprising: - a lower tub, mounted on the frame and comprising at least two openings, - an upper tub, mounted on the lower tub and comprising at least two protuberances, able to slide in the openings, - a plurality of springs, arranged between the lower tub and the upper tub.

Such a device can cushion a seat when subjected to a load. However, no mechanical member can guide the compression and extension of each spring. Thus, the springs are likely not to compress along their axis of extension, the seat does not then collapse completely vertically, gradually causing the deterioration of the mechanical elements constituting the damping device.

A first objective is to provide a device for damping a vehicle seat, this device being compact, so as to integrate into various types of vehicles, including automotive.

A second objective is to provide a device for damping a vehicle seat, this device allowing the seat to return to the initial position by a linear movement, so as not to degrade the mechanical elements constituting the device. amortization.

For these purposes, it is proposed, in the first place, a device for damping a vehicle seat comprising a frame, the device comprising: - a lower tub, mounted on the frame and comprising a plurality of slots ; - An upper bucket, mounted in translation with the lower bucket, between an initial position and a load position, the upper bucket comprising a plurality of fasteners slidable in the slots; a plurality of springs, arranged between the lower tub and the upper tub, the upper tub and the lower tub comprising respectively a plurality of primary bosses and secondary bosses, so as to set up and maintain in position each spring.

Advantageously, such a damping device allows a motor vehicle seat to properly absorb the vibrations transmitted by the underbody of a motor vehicle, without degrading the comfort of an occupant sitting on said seat.

Various additional features may be provided, alone or in combination: - the springs comprise a superposition of blades, for example metal; - Each slot comprises an upper stop, on which an attachment hook carried by a fastener bears, when the upper bucket is in the initial position; - Each slot comprises a lower stop, on which a hook attachment carried by a fastener comes into abutment, when the upper bucket is in full load position.

It is proposed, secondly, a seat comprising the damping device as shown above.

It is proposed, thirdly, a motor vehicle comprising such a seat.

Other features and advantages of the invention will appear more clearly and concretely on reading the following description of embodiments, which is made with reference to the accompanying drawings, in which: FIG. a perspective view of a motor vehicle (in dotted lines) comprising a seat (in continuous bold lines) provided with a damping device; - Figure 2 is an exploded perspective view of the seat of Figure 1, provided with a frame; FIG. 3 is an exploded perspective view of the armature of FIG. 2; FIG. 4 is an exploded perspective view of the damping device of FIG. 1; - Figure 5 is a sectional view of the damping device according to an initial position; - Figure 6 is a sectional view of the damping device according to a load position.

In Figure 1 is shown a vehicle 1 (in dashed lines) comprising a seat 2 (in continuous bold lines) for an occupant of the vehicle 1 to sit. In one implementation, the seat is that of the driver. It is understood that the other seats of the vehicle can also be provided with the damping device.

The vehicle 1 may, for example, be a particular motor vehicle or a utility vehicle.

One defines with respect to the vehicle 1 an orthogonal reference XYZ comprising three axes perpendicular two by two, namely: - an axis X, defining a longitudinal direction, horizontal, coincides with the general direction of movement of the vehicle, - an axis Y, defining a transverse direction, horizontal, which with the X axis defines a horizontal XY plane, - a Z axis, defining a vertical direction, perpendicular to the horizontal XY plane.

In the following description and with reference to the reference defined above, the terms "longitudinal" or "longitudinally" refer to a direction coincident with the X axis, the terms "transverse" or "transversely" are reference to a direction coincident with the Y axis, and the terms "vertical" or "vertically" refer to a direction coincident with the Z axis.

As shown in Figure 2, the seat 2 comprises: - a device 3 damping, - a backrest 4, allowing the occupant to maintain a good sitting posture by properly holding his back, - a frame 5, with which the backrest 4 is rotated, so that the occupant can manage its inclination, - a seat 6, comprising a fixed cushion 7, integral with the frame 5, and a cushion 8 movable disposed on the device 3 and mounted in rotation, along the axis Y, with the armature 5 so that the mobile cushion can tilt, - a support 9, provided with two rails 10, allowing the introduction and the maintaining the position of the frame 5, the support 9 being secured to a base of the vehicle 1.

As illustrated in Figure 3, the armature 5 comprises a first sidewall 11 spaced from a second sidewall 12, the two sides 11, 12 being secured by means of a bar 13 and front linkage a rear link bar 14.

The bars 13, 14 connecting to form a frame with the sidewalls 11, 12 and to stiffen the frame 5.

The armature 5 comprises a front cross member 15, mounted on the two sides 11, 12, and extending transversely from the first sidewall 11 to the second sidewall 12.

The cross 15 before allows to set up and maintain the fixed cushion 7 in position.

The front cross member 15 comprises a plate 16, on which the device 3 is mounted.

In the embodiment shown, the plate 16 has a plurality of holes 17, so as to secure the device 3 of the cross 15 before, for example by means of screws. In other embodiments, not shown, the cross member 15 and the device 3 are in one piece, for example sheet metal or composite material.

Other assemblies are used, in non-illustrated embodiments, for example welding, riveting, gluing.

As shown in Figure 4, the device 3 comprises a lower bucket 18 and an upper bucket 19, the movable cushion 8 of the seat 6 being in support of the upper bucket 19.

At each change in the vehicle's road behavior 1, the occupant will exert a vertical point load on the seat 2, specifically on the seat 6, the device 3 to cash this load.

The lower bucket 18 comprises an upper surface 20 and a lower surface 21. The lower bucket 18 has, in the front part, an inclined section 22, which extends a flange 23 adapted to abut the plate 16, to secure the lower bucket 18 of the cross 15 front. In an alternative embodiment, not shown, the front cross member 15 and the lower bucket 18 form a single piece, for example sheet metal or composite material.

The lower bucket 18 further comprises a flat section 24 and, at the rear, a cylindrical section 25.

The lower surface 21, at the cylindrical section 25, rests on the rear link bar 14, so that the lower bucket 18 is fixed relative to the frame 5.

The lower bucket 18 is hollowed with a plurality of slots 26, each defining a stop 27 and a top stop 28 lower. The slots 26 have for example a rectangular shape, and have a notch 29 in the vicinity of their abutment 28 below.

The slots 26 allow the assembly of the bucket 19 upper bucket 18 inferior. Indeed, the upper bucket 19 comprises a plurality of fasteners 30, of rectangular shape for example, and having a hook 31 attachment. Each fastener hook 31 has a width slightly smaller than the width of the notches 29, so that the fasteners 30 can easily be inserted into the slots 26.

Once the fasteners 30 are positioned in the slots 26, the upper bucket 19 can move vertically on a stroke equal to the distance between the upper stop 27 and the lower stop 28 of each slot 26.

Thus, the bucket 19 upper translate vertically, between an initial position, in which no load is applied to the seat 6, and a load position, in which a load is applied to the seat 6.

The device 3 comprises a plurality of springs 32, arranged between the lower bucket 18 and the upper bucket 19, so as to dampen the race bucket 19 upper.

In the embodiment shown, the springs 32 extend substantially along the Z axis.

Advantageously, the springs 32 are leaf spring type, and include a superposition of metal blades having mechanical properties for the absorption of mechanical energy.

The upper bucket 19 comprises a plurality of primary bosses 33, extending vertically from a lower surface 34 of the upper bucket 19, towards the lower bucket 18.

[0043] The lower bucket 18 comprises a plurality of secondary bosses 35 extending vertically from the upper surface 20 at the plane section 24 towards the upper bucket 19.

[0044] Advantageously, the combination of a primary boss 33 and a secondary boss 35 forms a capsule, in which each spring 32 can be guided, to be put in place and held in position. The primary bosses extend along an axis collinear with the axis of extension of the secondary bosses, so that the primary bosses are substantially aligned with the secondary bosses.

The capsules allow the springs 32 to extend and compress along their axis, preserving them from wear and ensuring a straight race to the upper bucket 19, along the Z axis.

As shown in Figure 5, the upper bucket 19 is in the initial position, and as can be seen on the locket, the hook 31 attachment is in contact with the stop 27 upper, the springs 32 are relaxed along their axis.

As shown in Figure 6, the upper bucket 19 is in the full load position, and as can be seen on the locket, the hook 31 attachment is in contact with the stop 28 lower, the springs 32 are contracted along their axis.

The springs 32 allow the upper bucket 19 to return to the initial position.

A white arrow in Figure 6 symbolizes the translation performed by the upper bucket 19 to move from its initial position to its full load position.

The device 3 described above has many advantages: it allows in particular to provide a compact cushioning solution of a seat, for several types of vehicle, including automotive. The device also makes it possible to limit the vibrations and noise generated by the road behavior of a vehicle, while preserving the wear of the mechanical parts that constitute the device 3. It makes it possible to preserve or even improve the comfort of the vehicles. occupants of a vehicle, including automobiles.

Claims (6)

1. Device (3) for damping a vehicle seat (2) (1) comprising an armature (5), the device (3) comprising: - a lower tub (18) mounted on the armature (5) ) and comprising a plurality of slots (26); - An upper bucket (19), mounted in translation with the lower bucket (18), between an initial position and a load position, the upper bucket (19) comprising a plurality of fasteners (30), slidable in the slots (26); a plurality of springs (32), arranged between the lower tub (18) and the upper tub (19), the device (3) being characterized in that the upper tub (19) and the lower tub (18) respectively comprise a plurality of primary bosses (33) and secondary bosses (35) so as to position and hold each spring (32) in position. 2. Device (3) according to the preceding claim, characterized in that the springs (32) comprise a superposition of metal blades. 3. Device (3) according to claims 1 or 2, characterized in that each slot (26) comprises a stop (27) upper, on which a hook (31) of attachment carried by a fastener (30) is supported when the upper bucket (19) is in the initial position. 4. Device (3) according to any one of claims 1 to 3, characterized in that each slot (26) comprises a stop (28) below, on which a hook (31) of attachment carried by a fastener (30). ) comes into support, when the upper bucket (19) is in full load position. Seat (2) comprising a damping device (3) according to any one of the preceding claims. 6. Vehicle (1) automobile comprising a seat (2) according to claim 5.