Arrangement comprising a casing and a pendulum-mounted motor relative to the casing, incorporating improved acoustic filtering means.

Abstract

An arrangement comprising a body and an engine pendulum-shaped relative to the body, incorporating improved acoustic filtering means. The invention relates to an arrangement (6) for a vehicle comprising a body (2) and an engine (5), the body (2) comprising a left side member (4L) and a right side member (4R), the engine (5) being mounted on the left side member (4L) by an upper left support means (3L) comprising two left vibration filtering means (7L), and on the right side member (4R) by an upper right support means (3R) comprising two right vibration filtering means (7R), the arrangement (6) comprising a lower support means (10), the lower support means (10) comprising a first lower vibration filtering means (20) and a second lower vibration filtering means (30) arranged between the engine (5) and the body (2). Illustration: Fig. 2

Description

Title of the invention: Arrangement comprising a box and a pendulum-driven motor relative to the box, incorporating improved acoustic filtering means. Technical field of the invention

[0001] The invention relates to an arrangement for a vehicle, the arrangement comprising a body, an engine, the engine being fixed relative to the body by upper support means and a lower support means comprising vibration-filtering means. The invention further relates to a vehicle comprising such an arrangement. Prior art

[0002] A vehicle, particularly a motor vehicle, generally comprises a body and an engine. Damping means are generally provided between such a body and such an engine in order to filter vibrations. Such damping notably improves acoustic comfort within such a vehicle.

[0003] In the case of an electric motor in particular, noise and / or vibration emissions are low in the usual frequency ranges. However, such emissions remain perceptible to the occupants of such a vehicle and are particularly harmful in high frequency ranges.

[0004] Low noise levels are one of the advantages of a vehicle, particularly an electric or hybrid one. Therefore, it is important to prevent noise emissions, especially those from vibrations produced by such an electric motor, from negatively impacting the acoustic comfort of the occupants of such an electric vehicle. Presentation of the invention

[0005] The object of the invention is to provide an arrangement that overcomes the above drawbacks. In particular, the invention proposes an arrangement of an engine on a casing in a pendulum-like fashion, incorporating improved filtration means, while being simple, reliable, and economical. Summary of the invention

[0006] To achieve this objective, the invention relates to a vehicle arrangement, in particular for a motor vehicle, comprising a body and an engine, the body comprising a left side member and a right side member, in particular a left front side member and a right front side member, the engine being mounted: - on the left longeron by means of an upper left support comprising two left vibration filtering means, and - on the right-hand side member by means of a high right-hand support comprising two right-hand vibration filtering means, the arrangement comprising a lower support means, in particular arranged behind the upper left and right support means in the longitudinal direction, the lower support means comprising a first lower filtration means and a second lower vibration filtration means arranged between the engine and the body.

[0007] The lower support means may include a connecting rod.

[0008] The connecting rod may include: - a first end connected to the engine, the first end possibly comprising a fixing element having an axis coinciding or substantially coinciding with a first axis of the connecting rod, and - a second end connected to the body, the second end possibly comprising a fixing element having an axis coinciding or substantially coinciding with a second axis of the connecting rod, in particular the first and second axes being parallel or substantially parallel to each other.

[0009] The connecting rod may include a first filtration pad arranged at the level of the first axis and a second filtration pad arranged at the level of the second axis.

[0010] The first filter pad may include a first cylindrical damping element, in particular made of elastic material, and / or the second filter pad may include a second cylindrical damping element, in particular made of elastic material.

[0011] The first plot and / or the second plot may each include a SILENTBLOC type filtration (registered trademark).

[0012] The mass of the lower support means can be between 1 kg and 5 kg.

[0013] The engine can be a thermal engine, or an electric engine, or a hybrid engine.

[0014] The invention further relates to a vehicle, in particular a motor vehicle, comprising an arrangement as defined above. Presentation of the figures

[0015] These objects, features and advantages of the present invention will be described in detail in the following description of an embodiment given by way of non-limiting reference in relation to the accompanying figures, among which:

[0016] Fig. 1 is a schematic view of a motor vehicle according to one embodiment of the invention.

[0017] Fig. 2 is a schematic view of an arrangement according to one embodiment of the invention.

[0018] Fig. 3 is a perspective view of a low support means for the arrangement according to the embodiment of the invention.

[0019] Fig. 4 is a front view of the lower support means according to the embodiment of the invention.

[0020] Fig. 5 is a schematic perspective view of a lower filtration means of the lower support means according to the embodiment of the invention.

[0021] Fig. 6 represents curves illustrating the sound level as a function of frequencies, according to the filtering means put in place between a pendulum motor and a vehicle body. Detailed description

[0022] The direction in which a vehicle, particularly 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, a right-handed coordinate system XYZ is used in which X is the longitudinal direction in the front-to-back direction of the vehicle, i.e., directed towards the rear, Y is the transverse direction directed to 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 backward direction.

[0023] As illustrated in [Fig. 1], a vehicle 1, for example a motor vehicle, comprises a body 2. The vehicle 1 comprises at least one engine 5, which may be electric, internal combustion, or hybrid. The engine(s) may be arranged at the front, and / or at the rear of the vehicle, and / or in a central position.

[0024] In the embodiment illustrated in Figures 1 and 2, only one motor 5 is provided. The motor 5 is arranged at the front of the vehicle.

[0025] The vehicle 1 further comprises an arrangement 6. The arrangement 6 comprises the body 2 and the engine 5. As illustrated in [Fig. 2], the body 2 comprises a left side member 4L and a right side member 4R. Preferably, the left side member 4L is located at the front left of the vehicle. Preferably, the right side member 4R is located at the front right of the vehicle.

[0026] The arrangement 6 further includes a left upper support means 3L and a right upper support means 3R. More specifically, the engine 5 is mounted relative to, or on, or to the left side member 4L by the left upper support means 3L. The left upper support means 3L includes two left filtering means 7L intended to filter, to ensure the filtering, of vibrations between the engine 5 and the body 2. The engine 5 is further mounted relative to, or on, or to the right side member 4R by means of upper right support 3R. The upper right support means 3R includes two right filtration means 7R intended to filter, ensure the filtering, of vibrations between the engine 5 and the casing 2. Thus, the engine 5 includes double filtration at the level of each of its two supports 3R, 3L.

[0027] The arrangement 6 further includes a lower support means 10 for the engine 5 relative to, on, or to the body 2. Preferably, the lower support means 10 is arranged behind the upper left and right support means 3L, 3R in the longitudinal direction X. Thus, the engine 5 is mounted in a pendulum-like fashion relative to the body. In other words, the engine 5 is suspended by means of the upper right support means 3R and the upper left support means 3L. Preferably, the upper right and left support means 3R, 3L are arranged at the front of the body 2 and above the lower support means 10 in the vertical direction. Thus, if the upper right and left support means 3R, 3L extend substantially along the same transverse axis AT, the engine 5 is inclined to pivot rearward about this axis AT. The torque-type force recovery is ensured by the lower support means 10.

[0028] The lower support means 10 includes a first lower filtration means 20. The lower support means 10 further includes a second lower filtration means 30. The first and second lower filtration means, or filtration means, filter the vibrations from the engine 5 and / or the housing 2, as applicable. The lower support means 10 is arranged between the engine 5 and the housing 2. Thus, the first and second filtration means 20, 30 are also arranged between the engine and the housing.

[0029] Advantageously, as illustrated in Figures 2, 3, and 4, the lower support means 10 comprises a connecting rod 15. The connecting rod 15, preferably with longitudinally extending axis L, comprises at one of its ends a first fastening element 8 having an axis coinciding, or substantially coinciding, with a first axis A1 of the connecting rod 15. The first fastening element 8, for example, of the screw, bolt, or threaded rod type, is fixed to the motor, in particular connected to the motor 5. The connecting rod 15 comprises, at its second end, a second fastening element 9 having an axis coinciding, or substantially coinciding, with a second axis A2 of the connecting rod 15. The second fastening element 9, for example, of the screw, bolt, or threaded rod type, is fixed to the housing, in particular connected to the housing 2. Preferably, the first and second axes A1 and A2 are parallel, or substantially parallel, to each other and are perpendicular. to the L axis.Preferably, the axes Al and A2 are contained in the same plane P ([Fig.3]).

[0030] For example, the first central filtration means 20 comprises a pad 11 arranged, provided, fixed, at the level of the connecting rod, more precisely at the level of the first axis Al where applicable. In addition, the second central filtration means 30 includes a pad 12 arranged, provided, fixed, at the level of the connecting rod, more precisely at the level of the second axis A2 where applicable.

[0031] Preferably, the first filter pad 11 comprises a first cylindrical damping element 13. For example, the first damping element 13 is made of an elastic material, for example rubber or a material having properties similar to those of rubber. Preferably, the second filter pad 12 comprises a second cylindrical damping element 14. For example, the second damping element 14 is made of an elastic material, for example rubber or a material having properties similar to those of rubber.

[0032] Advantageously, the first pad 11 and the second pad 12 each comprise a filtering element of generally cylindrical shape known under the registered trademark SILENTBLOC. Such an element comprises an external tubular portion 27; 37 intended to fit into a bore formed in the connecting rod 15. The element further comprises an internal tubular portion 26; 36 and an elastic cylindrical portion 28; 38 extending between the internal and external tubular portions as schematically illustrated in [Fig. 5]. A shaft or axis, generally a screw, in particular an unthreaded portion of a screw shank, is inserted into the internal tubular portion 26; 36. In the case of the first pad 11, such a screw is centered substantially on the first axis A1, and in the case of the second pad 12, such a screw is centered substantially on the second axis A2. Preferably, the internal and external tubular portions are metallic, for example, made of steel.

[0033] As will be explained later, the mass of the lower support means 10 is, for example, between 1 kg and 5 kg. For example, the center of gravity of the connecting rod 15 is eccentric, that is to say, not centered between the axes A1 and A2. For example, the body of the connecting rod 15 is made of a material having a significant density while also having good mechanical strength, for example cast iron and / or steel.

[0034] Figure 6 illustrates curves, with frequency expressed in Hertz (Hz) on the x-axis and sound level expressed in decibels (dB) on the y-axis. Curve L1 illustrates the values ​​of a pendulum motor with single filtering at its upper right and left support means and its lower support means. Curve L2 illustrates the values ​​of a pendulum motor with double filtering at its upper right and left support means and single filtering at its lower support means. Curve L3 illustrates the values ​​of a pendulum motor according to the illustrated embodiment, namely with the connecting rod 15 with double filtering and the supports 3R, 3L with double filtering.

[0035] In summary, the solution provides double vibration filtering at the connecting rod 15. As a reminder, the upper right and left support means 3R, 3L allow the motor 5 to be suspended around the tilting axis AT, which extends transversely or substantially transversely. More precisely, the motor 5 is suspended, or pendulum-like, with its center of gravity CG located rearward relative to the tilting axis AT, as illustrated in [Fig. 2]. Thus, the connecting rod 15 absorbs the torque generated by the eccentricity of the motor's center of gravity CG relative to the transverse axis AT of the motor supports 3R, 3L. As a reminder, preferably, the axis AT is above the connecting rod 15 in the vertical direction. The connecting rod 15 thus acts as a stop, preventing the motor 5 from pivoting around the axis AT.Such a pendulum motor, whether thermal and / or electric, requires that its noise and / or vibration levels be controlled over a wide frequency band.

[0036] The solution enables this control and attenuation, particularly of the frequency of the first vibration mode, by determining the stiffness of each pad 11, 12 and the mass of the connecting rod body 15. As a reminder, preferably, each pad includes a vibration damping means of the SILENTBLOC type, advantageously cylindrical. Thus, the connecting rod 15 has a geometry adapted to have a pad at each of its two axes A1, A2, that is, between the first mounting element 8 fixed to the engine and the connecting rod body, and between the second mounting element 9 fixed to the chassis and the connecting rod body. Furthermore, the connecting rod body contributes to adjusting a cutoff frequency via its mass, which is used as a "beating mass." The solution primarily aims to control the so-called cutoff frequency beyond which an acoustic gain is obtained.This results in increased acoustic comfort at the high frequencies typically encountered with a pendulum-mounted electric motor. Furthermore, the solution can be advantageous for a pendulum-mounted internal combustion or hybrid motor.

[0037] In other words, the lower support means 10 of the engine 5 are used to create a dual "mass-spring-damper" system that filters and reduces the level of noise and vibration. This solution complements the dual filtration of the "upper track" – supports 3R, 3L on the side members 4R, 4L, each equipped with two means 7R, 7L – with dual filtration of the "lower track" – a torque reaction link preferably attached to a subframe of the body 2. Thanks to this dual filtration of the "lower track," the "lower track" is prevented from acting as a bypass or detour for the transmission of noise and vibration from the engine to the body and vice versa. Thus, the noise and vibration are perfectly filtered and are not transmitted to the body, either through the "lower track" or the "upper track."

[0038] Thanks to the doubly filtered "lower channel", the vibration filtration of a pendulum motor is greatly improved; vibrations and noise do not reach the passenger compartment via the "lower channel".

[0039] The solution proves to be inexpensive, requiring no modification to the body, particularly the subframe. It is especially easy to integrate into an existing vehicle platform. As mentioned previously, the solution works equally well for internal combustion engine vehicles as for hybrid and / or electric vehicles. Furthermore, the connecting rod with the double filtration is easily adaptable to the type of application; it is sufficient to determine, through calculation and / or testing, the mass of the connecting rod body and the stiffness of each of the filtering pads to adjust the cutoff frequency of the low-pass filter. For example, the mass between the two pads or axes A1, A2 of the connecting rod is approximately 2 kg. Note that mass is one parameter and the stiffness of each pad is another parameter.

[0040] The solution primarily addresses mid and high frequencies, which are often problematic because they are associated with whistling or siren-like noises, thereby improving the vehicle's acoustic comfort. The solution thus isolates the mid and high frequencies of the engine more effectively, which is particularly beneficial when there is at least one electric motor. Passenger comfort is increased, and noise pollution for people near the vehicle is reduced.

[0041] In summary, the body or chassis is doubly filtered with respect to the pendulum-mounted motor 5. In other words, two levels or stages of noise and / or vibration filtering are provided.

[0042] The solution is compatible with the high torque of the electric motor and / or the electromagnetic excitations emitted by such a motor.

[0043] 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, or even in a central position of the vehicle, and receive an engine 5 arranged so as to be pendulumed about a substantially transverse axis so as to induce it to pivot towards the front of the vehicle, or towards the rear of the vehicle.

[0044] Thanks to the double filtration of the connecting rod, low noise and / or vibration emissions become virtually imperceptible to the occupants. The vehicle's engine therefore does not compromise the acoustic comfort of the vehicle's occupants.

[0045] In remark, the solution therefore achieves the desired objective of improving the acoustic comfort of a vehicle, in particular with electric motorization and with a motor mounted in a pendulum manner, while being simple, reliable and economical and has the advantage of being able to be used on other types of motorized vehicles, between a body and an engine, namely trucks, buses, utility vehicles or even two-wheelers.

Claims

Demands

1. Vehicle arrangement (6), in particular for a motor vehicle (1), comprising a body (2) and an engine (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, the engine (5) being mounted: - on the left side member (4L) by a left upper support means (3L) comprising two left vibration filtering means (7L), and - on the right side member (4R) by a right upper support means (3R) comprising two right vibration filtering means (7R), the arrangement (6) comprising a lower support means (10), in particular arranged behind the left and right upper support means (3L, 3R) in the longitudinal direction (X), the lower support means (10) comprising a first lower vibration filtering means (20) and a second lower vibration filtering means (30) arranged between the engine (5) and the body (2),the mass of the lower support means (10) being between 1 kg and 5 kg-,

2. Arrangement (6) according to the preceding claim, characterized in that the lower support means (10) comprises a connecting rod (15).

3. Arrangement (6) according to the preceding claim, characterized in that the connecting rod (15) comprises: - a first end connected to the engine, the first end comprising a fixing element (8) having an axis coincident or substantially coincident with a first axis (Al) of the connecting rod (15), and - a second end connected to the body, the second end comprising a fixing element (9) having an axis coincident or substantially coincident with a second axis (A2) of the connecting rod (15), in particular the first and second axes (Al, A2) being parallel or substantially parallel to each other.

4. Arrangement (6) according to the preceding claim, characterized in that the connecting rod (15) comprises a first filtering pad (11) arranged at the level of the first axis (Al) and a second filtering pad (12) arranged at the level of the second axis (A2).

5. Arrangement (6) according to the preceding claim, characterized in that the first filter pad (11) comprises a first cylindrical damping element (13), in particular made of elastic material, and / or in that the second filter pad (12) comprises a second cylindrical damping element (14), in particular made of elastic material.

6. Arrangement (6) according to any one of claims 4 or 5, characterized in that the first block (11) and / or the second block (12) each comprise a SILENTBLOC type filtration (registered trademark).

7. Vehicle arrangement (6) according to any one of the preceding claims, characterized in that the engine (5) is a thermal, or electric, or hybrid engine.

8. Vehicle, in particular motor vehicle (1), characterized in that it comprises an arrangement (6) according to any one of claims 1 to 7.

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