Arrangement comprising two levels of vibration filtration between a body and a vehicle powertrain

Abstract

The invention relates to an arrangement (6) for a vehicle comprising a body and a powertrain (5), a beam (10) extending transversely or substantially transversely between a left spar (4L) and a right spar (4R), the beam (10) being attached to the left spar (4L) by a first left attachment means (10L) and to the right spar (4R) by a first right attachment means (10R), the powertrain (5) being attached to the beam (10) by a second right attachment means (20R) and a second left attachment means (20L), the arrangement (6) comprising a first right vibration filtration means (15R) and a first left vibration filtration means (15L).

Description

[0001] TITLE: Arrangement comprising two levels of vibration filtration between a body and a vehicle powertrain.

[0002] Technical field of the invention

[0003] The invention relates to an arrangement for a vehicle comprising a body, a powertrain and a means for filtering vibrations between the body and the powertrain. The invention also relates to a vehicle comprising such an arrangement.

[0004] State of the prior art

[0005] A vehicle, particularly a motor vehicle, generally comprises a body and a powertrain. A filtration means is generally provided between such a body and such a powertrain so as to limit the transmitted vibrations. Such a filtration means makes it possible in particular to improve comfort in terms of acoustics within such a vehicle.

[0006] In the case of a powertrain including an electric motor, noise and / or vibration emissions are low on the frequency bands usually watched. However, such emissions remain perceptible to the occupants of such a vehicle, in particular due to their frequencies and the low level of background noise.

[0007] However, the low level of noise pollution is one of the advantages of an electric vehicle. Therefore, it is important to prevent noise and / or vibration emissions from such an electric motor from affecting the acoustic comfort of the occupants of such an electric vehicle.

[0008] Presentation of the invention

[0009] The object of the invention is to provide an arrangement which overcomes the above drawbacks. In particular, the invention provides an arrangement for fixing a powertrain to a body in a simple, reliable and economical manner.

[0010] Summary of the invention

[0011] To achieve this objective, the invention relates to a vehicle arrangement, in particular a motor vehicle, comprising a body and a powertrain, the body comprising:

[0012] - a left side member and a right side member, in particular a left front side member and a right front side member, a beam extending transversely or substantially transversely between the left side member and the right side member, the beam being fixed to the left side member by a first left fixing means and to the right side member by a first right fixing means, the powertrain being fixed to the beam by a second right fixing means and a second left fixing means, the arrangement comprising a first right vibration filtering means and a first left vibration filtering means, the first right filtering means being arranged between the second right fixing means and the beam and the first left filtering means being arranged between the second left fixing means and the beam.

[0013] The arrangement may comprise a second right vibration filtering means and a second left vibration filtering means, the second right filtering means being able to be arranged between the first right fixing means and the beam and the second left filtering means being able to be arranged between the first left fixing means and the beam.

[0014] The arrangement may comprise a second right vibration filtering means and a second left vibration filtering means, the second right filtering means being able to be arranged between the right spar and the beam and the second left filtering means being able to be arranged between the left spar and the beam.

[0015] The arrangement may comprise a second right vibration filtering means and a second left vibration filtering means, the second right filtering means being able to be arranged between the first right attachment means and the first right filtering means and the second left filtering means being able to be arranged between the first left attachment means and the first left filtering means.

[0016] The beam may be made of steel, in particular obtained by extrusion and / or by folding and / or by stamping.

[0017] The beam may be made of aluminum alloy, in particular obtained by extrusion and / or by folding and / or by casting.

[0018] The mass of the beam can be greater than or equal to 1 kg.

[0019] The arrangement may comprise an element having a mass greater than or equal to 5 kg, in particular an electric charger intended to recharge a traction and / or propulsion battery of the vehicle, the element being able to be fixed to the beam.

[0020] The beam can be positioned, depending on the vertical direction, above the powertrain.

[0021] The invention also relates to a vehicle, in particular a motor vehicle, comprising an arrangement as defined previously.

[0022] Presentation of figures

[0023] These objects, characteristics and advantages of the present invention will be explained in detail in the following description of a first embodiment, a variant of the first embodiment, and a second embodiment given without limitation in relation to the attached figures among which:

[0024] Figure 1 is a schematic view of a motor vehicle according to one embodiment of the invention.

[0025] Figure 2 is a schematic view of an arrangement according to a first embodiment of the invention.

[0026] Figure 3 is a front view of the arrangement according to the first embodiment of the invention.

[0027] Figure 4 is a front view of the arrangement according to a variant of the first embodiment of the invention.

[0028] Figure 5 is a section along a vertical and longitudinal plane of a first and a second straight filtration means according to the variant of the first embodiment of the invention.

[0029] Figure 6 is a schematic view of an arrangement according to a second embodiment of the invention.

[0030] Figure 7 is a perspective view of the arrangement according to the second embodiment of the invention.

[0031] Figure 8 is a graph illustrating the filtration differences between a single-filter attachment and a double-filter attachment.

[0032] Detailed description

[0033] The direction in which a vehicle, especially a motor vehicle, moves in a straight line is defined as the longitudinal direction X. By convention, the direction perpendicular to the longitudinal direction, located in a plane parallel to the ground, is called the transverse direction Y. The third direction, perpendicular to the other two, is called the vertical direction Z. Thus, we use a direct XYZ reference frame in which X is the longitudinal direction in the front-rear direction of the vehicle, therefore directed towards the rear, Y is the transverse direction directed towards the right and Z is the vertical direction directed upwards. The forward direction corresponds to the direction in which the vehicle usually moves in the longitudinal direction and is opposite to the rear direction.

[0034] As illustrated in Figure 1, a vehicle 1, for example a motor vehicle, comprises a body 2. The vehicle 1 comprises a powertrain 5. Preferably, the powertrain 5 comprises at least one electric motor 3. The powertrain may be arranged at the front, and / or at the rear of the vehicle, and / or in a central position. The vehicle 1 preferably comprises a battery 9 for storing electrical energy. The vehicle 1 further comprises an arrangement 6 comprising the body 2 and the powertrain 5.

[0035] Body 2 includes a left side member 4L. Body 2 also includes a right side member 4R. Advantageously, the left side member 4L is a left side member arranged at the front of the vehicle and the right side member 4R is a right side member arranged at the front of the vehicle.

[0036] The arrangement further comprises a beam or cross member 10 extending transversely, or substantially transversely, between the left spar 4L and the right spar 4R. The beam 10 is attached to the left spar and to the right spar. For example, the beam 10 is attached via a first left attachment means 10L to the left spar 4L. The beam is then also attached via a first right attachment means 10R to the right spar 4R.

[0037] The powertrain 5 is attached to the beam 10. Preferably, the powertrain 5 is attached via a second right attachment means 20R and a second left attachment means 20L to, or relative to, the beam.

[0038] The arrangement 6 further comprises a first right vibration filtering means 15R and a first left vibration filtering means 15L. In a first embodiment illustrated in Figures 2 and 3 and in a second embodiment illustrated in Figures 6 and 7, the first right filtering means 15R is arranged between the second right fixing means 20R and the beam 10. In the same way, on the other side, the first left filtering means 15L is arranged between the second left fixing means 20L and the beam 10.

[0039] Advantageously, the arrangement 6 also comprises a second right vibration filtration means 25R and a second left vibration filtration means 25L.

[0040] In the first embodiment illustrated in Figures 2 and 3, the second right filtration means 25R is arranged between the first right fixing means 10R and the beam 10. The second left filtration means 25L is then arranged between the first left fixing means 10L and the beam 10.

[0041] Alternatively, in the variant of the first embodiment illustrated in Figures 4 and 5, the second right filtration means 25R is arranged between the first right fixing means 10R and the first right filtration means 15R. The second left filtration means 25L is then arranged between the first left fixing means 10L and the first left filtration means 15L. In other words, in the variant of the first embodiment, as illustrated in Figure 5, the first filtration means 15R and the second filtration means 25R are juxtaposed, joined, conjoined, close to each other. On the left side, the first filtration means 15L and the second filtration means 25L are also juxtaposed, joined, conjoined, close to each other.

[0042] For example, as illustrated in Figure 5, the first filtering means 15R comprises a support 16R. The support 16R comprises a bore 17R. The support 16R preferably receives a resilient element 18R, for example comprising rubber or a material having similar properties, within the bore 17R. Preferably, the resilient element 18R, advantageously cylindrical, comprises an axial orifice 19R intended to receive an axis, for example a threaded screw rod, preferably an unthreaded portion of a screw rod or a threaded rod or a stud. Preferably, the second filtering means 25R comprises a housing 26R. The housing 26R comprises for example two bores 27R. The housing 26R preferably receives a resilient element 28R, for example comprising rubber or a material having similar properties, within each bore 27R.Preferably, each elastic element 28R, advantageously cylindrical, comprises an axial orifice 29R intended to receive an axis, for example a threaded screw rod 30, preferably an unthreaded part of a screw rod 30 or a threaded rod or a stud. As illustrated in FIG. 5, screws 30, for example two in number, preferably make it possible to fix the beam 10 on, or at, or above the second filtration means 25R. Advantageously, the screws 30 are screwed into threads 14R provided in the support 16R. Thus, the screws 30 make it possible to fix, assemble, the beam 10 on the second filtration means 25R and to fix, assemble, the first filtration means 15R on the second filtration means. In other words, the screws 30 sandwich the second filtration means 25R between the beam 10 and the first filtration means 15R.Advantageously, the two axes A29R of the orifices 29R of the elastic elements 28R are parallel, or substantially parallel, and are perpendicular, or substantially perpendicular, to the axis A19R of the axial orifice 19R of the elastic element 18R. For example, the axes A29R extend vertically, or substantially vertically, and the axis A19R extends transversely, or substantially transversely.

[0043] Advantageously, the left side of the variant of the first embodiment comprises the same principle of association between the first filtration means 15L and the second filtration means 25L. As illustrated in Figures 6 and 7, according to the second embodiment, the second right filtration means 25R is arranged between the right spar 4R and the beam 10. The second left filtration means 25L is then arranged between the left spar 4L and the beam 10. In other words, preferably, the second filtration means 25L provides the function of left fixing means between the beam and the left spar. The second right filtration means 25R then provides the function of right fixing means between the beam and the right spar. For example, each second filtration means 25R, 25L comprises four cylindrical studs with vertical or substantially vertical axes, as illustrated in Figure 7.For example, each first fixing means 15R, 15L comprises a cylindrical stud with a longitudinal or substantially longitudinal axis.

[0044] Preferably, each pad, elastic element 18R, 28R, first filtration means, second filtration means, comprises at least, or is at least, one part marketed under the brand name “SILENTBLOC”.

[0045] For example, the beam 10 is made of steel, in particular sheet steel. The beam 10 can be obtained by extrusion and / or by bending and / or by stamping. Preferably, the beam of the first embodiment (figure 3 in particular) is obtained by stamping. Preferably, the beam of the variant of the first embodiment (figures 4 and 5 in particular) is also obtained by stamping and has stampings 11 at the level of the passage of the screws 30. The stampings 11 make it possible in particular to improve the rigidity at the level of the fixing points between the beam 10 and the second filtration means 25R, 25L, that is to say under the heads of the screws 30 where appropriate.

[0046] Alternatively, for example for the second embodiment illustrated in particular in Figure 7, the beam 10 is made of aluminum alloy. It is for example obtained by extrusion and / or by folding, or preferably by casting, for example by die casting.

[0047] For example, particularly in the second embodiment, the mass of the beam 10 is a beating mass. This beating mass is defined so as to obtain a desired cutoff frequency of the order of 400 Hz for example (illustrated by a vertical broken line in Figure 8). For example, the mass of the beam is increased to lower the cutoff frequency or the mass of the beam is decreased to increase the cutoff frequency. The stiffness of each filtering means can also be adjusted. For example, the mass of the beam is at least 1 kg.

[0048] For example, preferably in the first embodiment (Figures 2 and 3) and in the variant of the first embodiment (Figures 4 and 5), the arrangement 6 comprises an element 7. Preferably, the element has a substantial mass, for example a mass greater than or equal to 5 kg. Thus, the element 7 preferably has a mass sufficient for the wedging of a swinging mass type mode. Preferably, at least one accessory such as a charger and / or an inverter and / or an electrical or electronic box is used so as to avoid the use of specific additional masses. Advantageously, the element 7 is an electric charger 8. For example, the electric charger 8 allows and / or participates in recharging the battery 9 supplying the at least one electric traction and / or propulsion motor of the vehicle. In this embodiment and in the variant, the element 7 (charger 8 for example) is fixed to the beam 10, for example on the beam 10.Preferably, in this case, the beam extends substantially in a transverse and longitudinal plane, in particular so as to facilitate the attachment of the charger to a surface having a substantial area above the beam. Preferably, in particular in the first embodiment and its variant, the beam 10 is positioned, in the vertical direction, above the powertrain 5. For example, the beam extends above the entire powertrain 5, at least above the at least one electric motor 3.

[0049] In summary, the body or chassis is doubly filtered compared to the powertrain 5. In other words, two levels or stages of vibration filtration are present. This double filtration is compatible with both a suspended or pendulum powertrain and a fixed powertrain.

[0050] Advantageously, the solution aims to use the mass of the beam or crosspiece 10. As a reminder, in the first embodiment and the variant illustrated in particular in Figures 3 and 4, an element is placed, preferably fixed, on the beam 10 so as to increase the initial mass of the beam alone. Thus, the beam provides a support function for the powertrain and a support function for all or part of the electrical engineering. As seen previously, the presence of the beam 10 is used to install the electric charger 8 there. The electric charger has a mass of, for example, between 12 kg and 20 kg. The beam, possibly made heavier by the charger and / or another element, thus acts as a “beater” and ensures optimal filtration of excitations or vibrations coming from the powertrain, in particular from the electric motor 3.In other words, the mass of the cross member 10 creates a swinging mass system allowing the modes to be lowered as illustrated in Figure 8. A filtration F is obtained with a PDF slope which is twice as high (24dB / oct) for a double filtration DF attachment than with a single filtration SF attachment with a PSF slope (12dB / oct) for FE frequencies higher than those of the mode created by the double filtration device (stiffnesses and swinging masses). The solution thus more effectively isolates the medium and high frequencies of the powertrain comprising at least one electric motor. More precisely, the body 2 maintains the powertrain 5 by means of several parts which are recalled below.

[0051] First of all, connecting pieces or first fixing means 10R, 10L are arranged between the side members 4R, 4L and the beam 10. Then, the vibration filtering pieces or second filtering means 25R, 25L, called second level, are arranged between the beam 10 and the connecting pieces 10R, 10L.

[0052] Alternatively, as illustrated in the second embodiment (figures 6 and 7), the side members can directly provide this connection function between the body and the beam, the second filtration means 25R, 25L then being directly interposed between the beam and the side members.

[0053] As a reminder, the fixing beam or crosspiece 10 extends substantially transversely.

[0054] Then, the filtration or vibration filtering parts or first filtration means 15R, 15L, called first level, are arranged between the beam 10 and the connecting parts or second fixing means 20R, 20L with the powertrain 5.

[0055] As illustrated in Figures 4 and 5 of the variant, the second filtration means 25R, 25L can be directly in interface with the first fixing means 10R, 10L and the first filtration means 15R, 15L, both for a fixed and pendulum powertrain.

[0056] The solution is simple, economical and allows the processing, attenuation and filtering of medium and high frequencies so as to improve the acoustics in particular. The comfort for the vehicle passengers is increased and the noise pollution for people near the vehicle is reduced. In addition, the solution allows a powertrain comprising at least one electric motor to be fixed within a body intended to receive a powertrain equipped with a thermal engine. In other words, despite the significant gap between the side members of a body intended to receive a thermal engine, the body can receive an electric powertrain without modification. Indeed, the cross member 10 makes it possible to bridge the difference in dimension in the transverse direction between an electric powertrain and a thermal powertrain. Indeed, a thermal powertrain is more voluminous at least in the transverse direction.The solution is compatible with the high torque of the electric motor and / or the electromagnetic excitations emitted by such a motor.

[0057] The solution allows the powertrain to be held firmly, rigidly, without overhang, while providing an F filtration gain of around 12 dB of additional filtration in the frequency range between 600 Hz and 1000 Hz compared to simple SF filtration, as illustrated in the graph in Figure 8.

[0058] Thus, although the powertrain includes at least one electric motor that emits vibrations and / or noise at annoying frequencies, the dual-stage filtration reduces or even eliminates them. This results in a reduction in these emissions. An electric vehicle equipped in this way is quieter and offers better acoustic comfort for occupants.

[0059] Although the 4R, 4L side members have been illustrated as side members arranged at the front of the vehicle, the side members can be arranged at the rear and receive a powertrain arranged at the rear of the vehicle. As a note, the solution therefore achieves the desired objective of improving the acoustic comfort of an electric vehicle while allowing the attachment of an electric powertrain to a body intended to receive a thermal engine, and has the advantage of being able to be used on other types of motorized vehicles between a body or chassis and the powertrain, namely trucks, buses, utility vehicles or even motorized two-wheelers.

Claims

CLAIMS 1. Arrangement (6) of a vehicle, in particular a motor vehicle (1), comprising a body (2) and a powertrain (5), the body (2) comprising: - a left side member (4L) and a right side member (4R), in particular a left front side member and a right front side member, - a beam (10) extending transversely or substantially transversely between the left spar (4L) and the right spar (4R), the beam (10) being fixed to the left spar (4L) by a first left fixing means (10L) and to the right spar (4R) by a first right fixing means (10R), the powertrain (5) being fixed to the beam (10) by a second right fixing means (20R) and a second left fixing means (20L), the arrangement (6) comprising a first right vibration filtering means (15R) and a first left vibration filtering means (15L), the first right filtering means (15R) being arranged between the second right fixing means (20R) and the beam (10) and the first left filtering means (15L) being arranged between the second left fixing means (20L) and the beam (10).

2. Vehicle arrangement (6) according to claim 1, characterized in that the arrangement (6) comprises a second right vibration filtering means (25R) and a second left vibration filtering means (25L), the second right filtering means (25R) being arranged between the first right fixing means (10R) and the beam (10) and the second left filtering means (25L) being arranged between the first left fixing means (10L) and the beam (10).

3. Vehicle arrangement (6) according to claim 1, characterized in that the arrangement (6) comprises a second right vibration filtration means (25R) and a second left vibration filtration means (25L) vibrations, the second right filtration means (25R) being arranged between the right spar (4R) and the beam (10) and the second left filtration means (25L) being arranged between the left spar (4L) and the beam (10).

4. Vehicle arrangement (6) according to claim 1, characterized in that the arrangement (6) comprises a second right vibration filtering means (25R) and a second left vibration filtering means (25L), the second right filtering means (25R) being arranged between the first right fixing means (10R) and the first right filtering means (15R) and the second left filtering means (25L) being arranged between the first left fixing means (10L) and the first left filtering means (15L).

5. Vehicle arrangement (6) according to one of the preceding claims, characterized in that the beam (10) is made of steel, in particular obtained by extrusion and / or by folding and / or by stamping.

6. Vehicle arrangement (6) according to one of claims 1 to 4, characterized in that the beam (10) is made of aluminum alloy, in particular obtained by extrusion and / or by folding and / or by casting.

7. Vehicle arrangement (6) according to one of the preceding claims, characterized in that the mass of the beam (10) is greater than or equal to 1 kg.

8. Vehicle arrangement (6) according to one of the preceding claims, characterized in that the arrangement (6) comprises an element (7) having a mass greater than or equal to 5 kg, in particular an electric charger (8) intended to recharge a traction and / or propulsion battery of the vehicle, the element (7) being fixed to the beam (10).

9. Vehicle arrangement (6) according to one of the preceding claims, characterized in that the beam (10) is positioned, in the vertical direction, above the powertrain (5).

10. Vehicle, in particular motor vehicle (1), characterized in that it comprises an arrangement (6) according to one of claims 1 to 9.

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