Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
  • B60K5/00—Arrangement or mounting of internal-combustion or jet-propulsion units
  • B60K5/12—Arrangement of engine supports
  • B60K5/1208—Resilient supports
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
  • B60K5/00—Arrangement or mounting of internal-combustion or jet-propulsion units
  • B60K5/12—Arrangement of engine supports
  • B60K5/1208—Resilient supports
  • B60K5/1216—Resilient supports characterised by the location of the supports relative to the motor or to each other
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
  • B60K5/00—Arrangement or mounting of internal-combustion or jet-propulsion units
  • B60K5/12—Arrangement of engine supports
  • B60K5/1208—Resilient supports
  • B60K5/1233—Resilient supports comprising protective elements, e.g. for protecting against heat, dust
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
  • B60Y2306/00—Other features of vehicle sub-units
  • B60Y2306/01—Reducing damages in case of crash, e.g. by improving battery protection

Definitions

• the invention relates to a device for fixing a powertrain in a vehicle, particularly in a motor vehicle.
• the document FR2831111 discloses a system for fixing a powertrain in a vehicle.
• a damping pad is supported by a bracket.
• the bracket folds and eventually breaks, which absorbs energy and avoids creating a hard point.
• known fastening devices take into consideration mainly, or even solely, the functions related to the maintenance of the powertrain in the vehicle itself.
• the absence or lack of consideration of other functions than the maintenance of the powertrain itself or of other components that the powertrain itself has the disadvantage of having to install in the vehicle organs or devices in addition to the fastening device.
• These additional organs and / or devices increase the supply and assembly costs, the complexity and the interior dimensions without necessarily always answering the problems which arise, in particular in frontal collision to avoid breaking vital organs.
• the invention relates to a device for fixing a power train to a motor vehicle body comprising a front face and a buffer to reduce a transmission of vibrations between the group power train and the body.
• the device is remarkable in that it comprises a piece disposed at the top of the pad and comprising at least a first ramp which is disposed on a face opposite to the front face and which rises progressively in the direction of this front face.
• this piece has a mass in a range of values between 150g and 700g, in particular between 300g and 400g.
• the first ramp of this piece has a flat surface.
• the device includes a hollow insert passing through the pad to receive a powertrain support shaft.
• the aforementioned part comprises a central through opening to pass this axis.
• the aforementioned part comprises an opening coaxial with the central through opening and of diameter greater than that of the central through opening for receiving a fixing means on this axis.
• the aforementioned part comprises at least one indexing depression.
• the above-mentioned room may include a second ramp.
• the device comprises a buffer support which may comprise a third ramp with a slope which initiates the slope of the first ramp.
• FIG. 1 illustrates the fixing device according to the invention in its implementation context
• Figure 2 shows a fixing device to which the invention applies
• Figure 3a is a top view of a part for carrying out the invention
• Figure 3b is a sectional view of the part of Figure 3a;
• Figure 4 is a perspective view of an exemplary implementation of the invention.
• FIG. 1 shows a device for attaching a power train 16 to a motor vehicle body, not shown in FIG. 1.
• the powertrain is fixed on the body by means of a fixing device on the engine side and a fixing device on the gearbox side.
• the invention is equally applicable to the attachment side engine that the gearbox-side attachment, it is of particular interest on the gearbox side. Indeed, the box As speeds are generally lower than the engine, there is still room in the engine compartment above it to accommodate various components, including an air filter, a brake pressure booster, and an electric battery.
• the notion of the front face of any object is identical to the concept of the front face of the vehicle.
• a direction towards the front of the vehicle corresponds to the usual direction of the vehicle, unlike that in reverse.
• the front face of the fixing device is the one facing towards the front of the vehicle.
• each of the two powertrain attachment devices in particular the gearbox-type attachment device, comprises a buffer 13 for reducing a transmission of vibrations between the powertrain and the body.
• the pad 13 is usually made of synthetic or natural elastomeric material. The viscoelastic properties of the elastomeric material make it possible to obtain a vibration damping coefficient that is largely known per se.
• the buffer 13 comprises, for example, a lower plate 1 which makes it possible to secure it with a buffer support 17 by means of screws 19.
• the buffer support 17 is itself fixed to a spar 30 of the vehicle body by screws 3.
• the buffer assembly 13, buffer support 17, screw 3, then forms the connecting element of the fastening device to the vehicle body.
• a support pin 11 adheres to a gearbox support 15 to which is attached the gearbox of the power unit 16 by one or more screws 4.
• a fastening means 12 makes it possible to secure the buffer 13 with the axis 11.
• the top of the axis 11 is threaded and the fastening means 12 is a nut which is screwed on the axis 11.
• the buffer 13 is drilled at its center to allow the passage of a hollow insert 14 made of plastic.
• the top of the buffer 13 is here protected by an upper plate 7 so that the tightening of the nut which constitutes the fastening means 12 in this example, does not alter the buffer 13.
• the material of the upper plate 7 is similar in nature to that of the material of the lower platen 1, for example metal or synthetic type thermosetting resin. The screwing of the nut on the axis then presses on the upper platen upper face 7 so as to maintain the insert 14 between the lower face of the upper plate and a shoulder 6 formed at the base of the axis 11.
• the illustrative vehicle here comprises an air filter 21 facing a front face of the fixing device and a battery 23 facing a face opposite to the previously mentioned front panel.
• the battery 23 is supported by a battery support tray 22 connected here to the buffer support 17 by a pilaster 18.
• Our fixing device differs from previously known devices in that it comprises an original part 10 which is disposed at the top of the pad 13.
• the part 10 comprises a ramp 31 on a face opposite to the front face of the fixing device.
• the ramp has at least one slope that rises progressively in the direction of the front face. This ramp has a particularly interesting technical effect which appears more clearly in FIG.
• FIG. 4 shows a brake pressure booster 40 (Mastervac or other booster) mounted on the vehicle facing the front face of the battery support tray 22 beyond the fixing device according to the invention.
• a brake pressure booster 40 Mastervac or other booster
• the inertial force of the various organs of the vehicle tends to detach them from their supports to project them forward. If the battery support tray breaks or detaches from its support under the weight of the battery 23 projected forward, the battery must be prevented from coming into contact with any protuberance of the rear-facing vehicle, in particular a nose 41 of the pressure amplifier 40, to avoid drilling and spread the electrolyte.
• the arrangement of the fixing device between the brake pressure amplifier 40 and the battery 23 requires the tray 22 and / or the battery 23 to come into contact with the fixing device, in particular with the part 10, before contact with the nose 41.
• the ramp 31 of the part 10 then deflects the battery upwardly so that it does not come crashing into the brake pressure amplifier 40.
• the ramp 31 it is possible to realize the ramp 31 by giving the piece 10 in the form of a cone or a vertical truncated cone. However, the effective part of the controlled surface of the cone is then reduced to the generating line of the cone, or at most to a narrow band centered on the generative line opposite the front face. The movement of the battery has an unpredictable risk of deviating from either side of the cone or truncated cone.
• Figures 3a and 3b show a part 10 with a generally parallelepiped base on which the ramp 31 has a flat surface.
• Figure 3b is a sectional view of the part 10 along the line BB of Figure 3a which is a view from above.
• the rising slope of the flat surface has the advantage of offering a greater contact dimension to any object that comes to meet it to better deflect it upwards, in particular by avoiding to tilt it to one side or the other .
• the piece 10 Regardless of the external shape of the piece 10, be it conical, trapezoidal, pyramidal or other, it comprises a central through opening 32 of sufficient diameter to pass the shaft 11 received by the hollow insert 14 which crosses the buffer 13.
• the opening 32 allows a quick and easy introduction of the piece 10 on the top of the pad 13.
• a second opening 33 coaxial with the central through opening 32 is of sufficient diameter to receive the fixing means 12 on the axis 11.
• the diameter of the central through opening 32 is smaller than that of the opening 33 so as to forming a ring 42 at the base of the piece 10.
• a concavity 34 transverse to the slope of the ramp 35 is particularly useful for exercising at least one of the following two functions.
• the concavity 34 constitutes an indexing mark relative to the screws 19 which facilitates a correct positioning of the piece 10 on the buffer 13.
• the concavity 34 also offers a better grip of the part 10 during its assembly.
• the concavity 34 facilitates a screw driver to fix the pad 13 by means of the screws 19.
• the concavity 34 also facilitates a manual fanning by the operator in the editing station. Note that the indexing function is active in the sense that a bad positioning of the part 10 can impede the passage of the screwdriver, thus forcing to reposition the part 10.
• the concavity 34 is preferably split, especially when the part 10 comprises a second ramp 35.
• the second ramp 35 on the face opposite to that of the ramp 31 has little use in terms of protection against collision in that, after mounting on the buffer 13, it would be on the front face of the powertrain fastening device.
• this symmetrical structure of the part 10 facilitates the work of the editor in the sense that the latter does not have to worry about the forward or backward direction of the part 10 during its capture.
• the double ramp prevents the fitter from making a mistake.
• the piece 10 thus provides good protection of the battery 23 in the event of a violent frontal collision (crash in English) by means of its ramp whose inclined plane makes it possible to divert the battery upward, thus making use of its weight to fight against its inertia in the direction of travel of the vehicle, in addition to the fact that it naturally prevents the battery to hit a sharp element in the front of the vehicle such as the nose of the brake pressure amplifier.
• Part 10 could be made of a lightweight material of the synthetic polymer type or the like.
• a range of values that can vary from plus or minus 50g around 350g has given excellent results for the treatment of the siren of the gearbox.
• the anti-collision protection of the battery is also enhanced when the part 10 has a mass in one of the ranges of values mentioned above.
• the anti-collision protection of the battery is reinforced when the buffer support 17 comprises a third ramp 36 with a slope which initiates the slope of the first ramp 31, thus favoring the deflection of the battery upwards. Note that in the absence of the piece 10 for one reason or another, the ramp 36 already produces a certain upward deflection.
• An additional advantage of the part 10 is that its mass provides a beneficial technical effect to the vehicle, also outside the collision, in other words during its normal operation.
• the vibrations of the powertrain transmitted by the support 15 to the buffer 13 are reflected by the mass of the part 10, so that the buffer 13 works more in alternative deformations in the absence of mass, favoring thus a dissipation of the energy of the vibrations.
• the piece 10 then adds an additional mass in a spring-mass system consisting of the masses of the various bodies of the vehicle and the stiffness of their links between them and the vehicle body.
• the equations governing the natural frequencies of such a system as a function of the distribution of masses and stiffness are well known and well mastered by the skilled person.
• a mass value assigned to the part 10, substantially equal to 350 g is that which has been found by calculation and then refined by tests / simulations to reduce the sound noise of the members linked to the powertrain fixing device, such as in particular the gearbox.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Transportation (AREA)
• Mechanical Engineering (AREA)
• Arrangement Or Mounting Of Propulsion Units For Vehicles (AREA)
• Vibration Prevention Devices (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=55072979

Family Applications (1)

Country Status (4)

Families Citing this family (1)

Family Cites Families (7)

• 2015
  • 2015-11-10 FR FR1560743A patent/FR3043365B1/fr active Active
• 2016
  • 2016-11-09 WO PCT/FR2016/052898 patent/WO2017081401A1/fr unknown
  • 2016-11-09 EP EP16806267.7A patent/EP3374220A1/de active Pending
  • 2016-11-09 CN CN201680065592.2A patent/CN108349364B/zh active Active

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