Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
  • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
  • F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
  • F16F15/12—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon
  • F16F15/131—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon the rotating system comprising two or more gyratory masses
  • F16F15/13107—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon the rotating system comprising two or more gyratory masses for damping of axial or radial, i.e. non-torsional vibrations
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
  • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
  • F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
  • F16F15/12—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon
  • F16F15/131—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon the rotating system comprising two or more gyratory masses
  • F16F15/13142—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon the rotating system comprising two or more gyratory masses characterised by the method of assembly, production or treatment
  • F16F15/1315—Multi-part primary or secondary masses, e.g. assembled from pieces of sheet steel
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
  • F16F2222/00—Special physical effects, e.g. nature of damping effects
  • F16F2222/04—Friction

Definitions

• the present invention generally relates to internal combustion engines.
• a torque transmission device of an engine which comprises a driving shaft, a flywheel having a hub adapted to be fixed on the driving shaft and an annular inertial mass which, larger in diameter than the hub, is integral with this hub and has a rear radial face oriented on the crankshaft side, means for damping the oscillations of the annular inertial mass with respect to this hub, comprising at least one damping member connecting the hub to the inertial mass annular and able to deform elastically in the direction of the axis of the driving shaft.
• the invention finds a particularly advantageous application for torque transmission devices comprising a flexible type flywheel.
• a so-called softened flywheel is generally used.
• WO 2004/065807 describes, in its embodiment illustrated in Figure 13, a torque transmission device of an engine which comprises a flywheel.
• the flywheel comprises a hub adapted to be fixed on a driving shaft and an annular inertial mass fixed to the hub. It is also provided a damping member oscillations of the inertial mass annular with respect to this hub, able to deform elastically in the direction of the axis of the driving shaft, and which comprises an outer portion arranged to bear against and cooperate by friction with the rear radial face of the annular inertial mass. flywheel.
• the damping member is attached to the hub of the flywheel on the side of the clutch, that is to say against the face of the hub opposite the crankshaft.
• the damping member is mounted during assembly of the flywheel.
• the document WO 2004/065807 does not provide any possibility of adjusting the support force of the damping member against the annular flywheel mass of the flywheel. Such a setting would be particularly inconvenient, if not impossible, insofar as, to achieve such an adjustment, it would indeed be necessary to disassemble the flywheel to replace the damping member or insert the spacers.
• the present invention proposes a novel torque transmission device adapted to reduce the axial deflections of the flywheel.
• a torque transmission device of an engine which comprises a driving shaft, a flywheel having a hub adapted to be fixed on the driving shaft and an annular inertial mass which, moreover large diameter that the hub, is integral with the hub and has a rear radial face oriented on the side of the crankshaft, means for damping the oscillations of the annular inertial mass with respect to this hub, comprising at least one damping member connecting the hub to the annular inertial mass and able to deform elastically in the direction of the axis of the driving shaft, wherein the damping member comprises a central portion which bears on the driving shaft and a part external arranged to bear against and cooperate by friction with the rear radial face of the annular inertial mass of the flywheel.
• the damping member rubs on the portion of the annular inertial mass of the flywheel with which it is supported, which reduces the axial movements of the flywheel annular mass of the flywheel.
• the flywheel retains the flexibility that gives it its bending capacity. So the large amplitudes of the axial deflections of the inertial mass are reduced by friction of the damping member on the inertial mass, without significantly affecting the bending capacity of the entire flywheel.
• This damping member is a part independent of the flywheel and the crankshaft and becomes integral with the hub of the flywheel and crankshaft when assembling the transmission device.
• the mounting of the damping device is simplified which reduces the production costs of the transmission device
• such a damping member uses for its fixation that the fixing screws of the flywheel hub and can be used regardless of the type of flywheel without having to add an additional fastening system
• the device comprises means for enabling, during the assembly of the flywheel with the drive shaft and the damping member, an adjustment of the axial elastic return force of friction exerted by the outer portion of the damping member
• the damping member can thus receive an adjustable preload so as to ensure a permanent contact of the damping means with the annular flywheel flywheel mass.
• the prestressing level is the support force of the damping member against the annular flywheel mass of the flywheel Thanks to the arrangement of the damping member between the flywheel and the driving shaft, it is possible to adjust by means of the fixing screws of the hub of the flywheel on the driving shaft, the level of prestressing imposed on the damping member Thus, one can adjust the level of friction that one wishes to generate between the body of damping and the annular inertial mass during oscillations of the inertial mass.
• the driving shaft having a fixing plate, the central portion of the damping member is located between the hub of the flywheel and the attachment plate of the driving shaft,
• the damping member has holes for the passage of fixing screws for passing through the flywheel hub and to be housed in the crankshaft,
• the damping member comprises tabs which extend radially from the central part and whose end portion constitutes the outer part of the damping member,
• the central part of the damping member is of annular shape and the damping member comprises two tabs which extend radially from the central part and whose end portion constitutes the outer part of the damping member , the flywheel having at least one preferred axis of flexion, each tongue is disposed along a preferred axis of flexion of the flywheel,
• the damping member is a plate, the plate is a washer,
• FIG. 1 is a side view of a flywheel and a crankshaft
• FIG. 2A is a rear view of the flywheel according to a first embodiment
• FIG. 2B is a view according to section A-A of the flywheel of FIG. 2A,
• FIG. 3 is a sectional view in the median plane of the flywheel according to a second embodiment
• FIG. 4A is a sectional view in the median plane of the flywheel according to a third embodiment
• FIG. 4B is a view according to section B-B of the flywheel of FIG. 4A,
• FIG. 5A is a sectional view in the median plane of the flywheel according to a fourth embodiment
• FIG. 5B is a view along section C-C of the flywheel of FIG. 5A.
• FIG. 1 shows part of a torque transmission device of an internal combustion engine of a motor vehicle
• This torque transmission device comprises a driving shaft, HERE a crankshaft 10 provided with a plate 11 for attachment, and a flywheel 20 intended to cooperate with a clutch disc (not shown)
• the flywheel 20 comprises, on the one hand, a hub 22 adapted to be fixed to the plate 11 of the crankshaft 10 and, on the other hand, an annular inertial mass 21 which, on a larger scale, Diameter that the hub 22, is integral with the hub 22
• the inertial mass 21 has a rear radial face 19 oriented on the side of the crankshaft 10 and a front radial face 18 opposite intended to cooperate by friction with the disc of clutch (not shown)
• the hub 22 constitutes the central part of the flywheel 20
• the flywheel 20 has openings, or through windows 23, 24, 25, 26 formed in the hub or central portion, of the flywheel
• the two through windows 26 are diametrically opposed and symmetrical to each other with respect to the axis X perpendicular to the plane of symmetry of the crankshaft 10 which allows to have flexibility around this axis X
• the two through windows 23, 24 are diametrically opposed and symmetrical to one another with respect to the Y axis, that is to say the axis defined by the intersection of the average plane of the flywheel 20 and the plane of symmetry of the crankshaft 10 which allows to have flexibility around this axis
• the levels of flexibility around the two preferred axes X and Y can be adjusted by acting on the size and shape of the through windows
• the positions of these preferred axes with respect to each other and with respect to the plane of the crankshaft can be adjusted in order to decouple the bending modes around each of these two axes, that is to say in order to position , in the frequency range, the bending mode of the wheel around the X axis far enough from the bending mode around the Y axis not to increase the vibration of the crankshaft.
• This torque transmission device also comprises means for damping the oscillations of the annular inertial mass 21 with respect to the hub 22.
• damping means comprise a damping member 30 connecting the hub 22 to the annular inertial mass 21 and able to deform elastically in the direction of the axis A1 of the crankshaft 10.
• the damping member 30 comprises a central portion 33 which bears on the driving shaft 10 and an outer portion 312, 322 arranged to bear against and cooperate by friction with the rear radial face 19 of the inertial mass 21 annular flywheel 20.
• the central portion 33 of the damping member 30 is located between the hub 22 of the flywheel 20 and the plate 11 for fixing the crankshaft 10.
• the damping member 30 is a flexible plate 30 made of a material, for example steel, sufficiently elastic to be able to deform under the effect of the deflections of the inertial mass and sufficiently strong mechanically to be able to hold under the effect of the alternating stresses imposed by the inertial mass in flexion.
• the plate is in one piece and is obtained by stamping and cutting.
• the plate has a small thickness, for example between 1 mm and 3 mm.
• the flexible plate 30 comprises tongues 31, 32 which extend radially from the central portion 33 and whose end portion constitutes the outer portion 312, 322 of the damping device.
• the central portion 33 is here in the form of a ring and interconnects the two tabs.
• These tongues 31, 32 also comprise an intermediate portion 311, 321 inclined with respect to the end portion of the corresponding tongue and with respect to the central portion 33 of the plate 30.
• the hub 22 of the flywheel 20 has holes for the passage of the fixing screws 12.
• the fixing ring is provided with through holes 34 intended to be positioned vis-à-vis the fixing holes of the hub 22 of the flywheel 20 , in order to pass through elements 12 for centering and fixing the flywheel 20 on the crankshaft, for its attachment between the hub 22 of the flywheel 20 and the plate 11 of the crankshaft 10.
• each tongue is disposed along a preferred bending axis of the flywheel 20, here the Y axis.
• a preferred bending axis of the flywheel 20 here the Y axis.
• tabs along the X axis. of the transmission device is carried out as follows.
• the crown-shaped central part of the flexible plate is first attached to the crankshaft plate. Then the hub of the flywheel is positioned on the crankshaft plate vis-à-vis the ring so that the fixing holes of the hub are in front of the passage holes of the crown of the flexible plate to allow attachment flywheel and plate on the crankshaft plate.
• the inclined intermediate portion of the tongue is flattened which generates a prestressing force of the tongue on the annular mass.
• the tightening of the screw makes it possible to adjust the planarization and thus the level of prestressing. By against it may be useful to provide washers to compensate for any play between the hub of the flywheel and the central portion of the plate, depending on the desired level of clamping.
• a plate 60 provided with tongues 61, 62 whose external parts 63, 64 are widened at their end intended to bear against the rear radial face 19 of the inertial mass 21.
• FIGS. 4A and 4B It is also possible according to a third embodiment shown in FIGS. 4A and 4B to produce a stack of flexible plates.
• a second flexible plate 40 is stacked on the first flexible plate 30.
• the tongues 31, 41 and 32, 42 of each of these plates 30, 40 are superimposed with each other, which makes it possible to increase the friction during the oscillation of the flywheel around its axis of bending Y.
• the surfaces of the portions of the tongues and portions of the annular inertial mass intended to be in contact can be adapted to promote contact between these two parts by means of a suitable machining process and / or by depositing a specific coating .
• annular inertial mass is provided with specific arrangements (not shown) for receiving the ends of the tongues in order to improve the endurance resistance of the interfaces between the steel tongues and the cast ring mass.
• the flexible plate is a washer 50, that is to say a hollow disc at the passage of the crankshaft and fastening screws.
• This washer 50 is in contact with the entire rear radial face of the hub 22 and the annular mass 21 of the flywheel 20.
• flywheel is perforated.
• damping member as described above with a solid flywheel.
• the flywheel is here monobloc, but, alternatively, it can be provided that the annular inertial mass and the hub flywheel form separate parts.
• the damping member is monobloc, but, alternatively, it could consist of several parts.
• the damping member as described above can be used with a flexible flywheel comprising an annular mass and a flexible annular flange.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Acoustics & Sound (AREA)
• Aviation & Aerospace Engineering (AREA)
• Mechanical Engineering (AREA)
• Manufacturing & Machinery (AREA)
• Mechanical Operated Clutches (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

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Family Cites Families (6)

• 2005
  • 2005-12-27 FR FR0513354A patent/FR2895471B1/fr not_active Expired - Fee Related
• 2006
  • 2006-12-06 WO PCT/FR2006/051297 patent/WO2007074253A2/fr active Application Filing
  • 2006-12-06 EP EP06842108A patent/EP1966510A2/de not_active Withdrawn

Non-Patent Citations (1)

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