Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
  • H02K29/14—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with speed sensing devices
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
  • B60S1/00—Cleaning of vehicles
  • B60S1/02—Cleaning windscreens, windows or optical devices
  • B60S1/04—Wipers or the like, e.g. scrapers
  • B60S1/06—Wipers or the like, e.g. scrapers characterised by the drive
  • B60S1/16—Means for transmitting drive
  • B60S1/166—Means for transmitting drive characterised by the combination of a motor-reduction unit and a mechanism for converting rotary into oscillatory movement
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
  • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
  • H02K11/21—Devices for sensing speed or position, or actuated thereby
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
  • H02K29/06—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
  • H02K29/06—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices
  • H02K29/08—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices using magnetic effect devices, e.g. Hall-plates, magneto-resistors
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
  • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
  • H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
  • H02K7/1163—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears where at least two gears have non-parallel axes without having orbital motion
  • H02K7/1166—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears where at least two gears have non-parallel axes without having orbital motion comprising worm and worm-wheel
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T74/00—Machine element or mechanism
  • Y10T74/19—Gearing
  • Y10T74/19642—Directly cooperating gears
  • Y10T74/19698—Spiral
  • Y10T74/19828—Worm

Definitions

• the present invention relates to a fixing device for securing a multipolar magnetic ring on a wheel intended to be driven in axial rotation by an electric motor, and in particular a gear motor wheel.
• the invention finds a particularly advantageous, but not exclusive, application in the field of windscreen wiper mechanisms for motor vehicles. It is known to use a multipolar magnetic encoder to determine the angular position and / or the speed of rotation of an output shaft of a gear motor.
• the encoder is generally in the form of a ring which is magnetized so as to present an alternation of north and south zones, and which is secured concentrically on the output wheel of the reducer.
• the principle then consists, using a fixed magnetic sensor, for example with a hall effect, over time detecting the fronts of change of fields on the ring when the support wheel is in rotation, then in 1 extrapolating them. the values of the parameters sought.
• the main techniques used today to secure a multipolar magnetic ring on a gearbox output wheel are bonding, overmolding, crimping, and fixing by clips. But in use, bonding proves to be a complicated fixing process to implement since it is always difficult to handle glue and where the maintenance of a gluing machine is never obvious. Adhesive temperature resistance also constitutes an obstacle to the wide dissemination of this assembly technique. Overmolding also has major drawbacks.
• the technical problem to be solved, by the object of the present invention is to propose a device for fixing a multipolar magnetic ring on a wheel intended to be driven in axial rotation by an electric motor, and in particular a motorcycle wheel.
• the fixing device comprises at least one stop element secured to the wheel, which is capable of fitting together with an anchoring projection secured to the ring magnetic, in a coupling direction substantially parallel to the plane of the wheel, as well as at least one locking clip secured to the wheel, which is capable of fitting together after elastic deformation with a locking projection secured to the magnetic ring , in a coupling direction substantially perpendicular to the plane of the wheel.
• the invention as defined relates to any type of multipolar magnetic ring, whether the latter is open or completely circular.
• FIG. 1 illustrates in perspective a geared motor intended to equip a wiper mechanism of motor vehicle.
• Figure 2 is a view similar to Figure 1 with the reducing part open.
• Figure 3 shows in more detail the movable assembly which is visible in Figure 2, and which consists of a wheel coupled to an output shaft on the one hand and a magnetic ring on the other hand.
• Figure 4 shows in perspective the magnetic ring of Figure 3.
• Figure 5 shows a portion of the upper face of the wheel, which is located at the locking clip.
• Figure 6 is a perspective view from above of the wheel coupled to the output shaft.
• FIG. 7 also shows a portion of the upper face of the wheel, which is situated at the level of a stop element.
• the same elements have been designated by identical references. Likewise, only the essential elements for understanding the invention have been shown, and this without respecting the scale and in a schematic manner.
• Figure 1 illustrates a gear motor 100 for a motor vehicle windscreen wiper mechanism.
• This mechanism is essentially composed of an electric motor 110 to which is coupled a reducer 120 responsible for increasing the speed.
• the reduction gear 120 comprises two casings 121, 122 which are secured together by means of several assembly screws 123.
• the upper casing 121 also has the function of serving as a support for fixing the wiper mechanism to the body of the motor vehicle.
• Two housings 124, 125 are in fact formed on two separate legs 126, 127 in order to receive conventional fixing dampers not shown here for obvious reasons of clarity.
• the lower casing 122 is above all intended to support all of the internal components of the reducer 120.
• a worm 128 which is able to be driven in axial rotation directly by the electric motor 110, as well as a toothed wheel 20 which is integral with an output shaft 129 mounted movable in rotation along an axis substantially perpendicular to the axis of rotation of the worm 128.
• the assembly is arranged so that that the worm 128 cooperates by meshing with the toothed wheel 20, so that the output shaft 129 is able to be driven indirectly in axial rotation by the electric motor 110.
• the toothed wheel 20 supports a multipolar magnetic ring 10 which is secured flat against the upper face 21 of said wheel 20, by means of a fixing device 1.
• the magnetic ring 10 is positioned concentrically with respect to the axis of rotation of the wheel 20, and consequently with respect to the output shaft 129.
• the magnetic ring 10 is here of the open type because this shape is perfectly suited for use in a geared motor 100 d 'wiper.
• the electric motor 110 is indeed of the reversible type and the angular amplitude of the shaft 129 at the output of the reducer 120 almost never exceeds 180 °.
• This open form is also particularly advantageous at the time of assembly because it allows a radial approach of the magnetic ring 10 relative to the wheel 20, without being hindered by the output shaft 129.
• Figure 3 shows more particularly the mobile assembly which constitutes the wheel 20 coupled to the output shaft 129 on the one hand and to the magnetic ring 10 on the other hand.
• the wheel 20 is provided with two stop elements 22a, 22b and a locking clip 23, while the magnetic ring 10 is provided with two anchoring projections 12a, 12b and a locking projection 13.
• the assembly is arranged so that, on the one hand, the two stop elements 22a, 22b are respectively able to fit together with the two anchoring projections 12a, 12b in a coupling direction substantially parallel to the plane of the wheel 20, and that on the other hand, the locking clip 23 either able to fit together after elastic deformation with the locking projection 13, in a coupling direction substantially perpendicular to the plane of the wheel 20.
• the term coupling direction is understood here to mean the relative direction in which the magnetic ring 10 must be brought closer to the wheel 20 to make effective the implementation, as the case may be, of the abutment elements 22a, 22b or of the locking clip 13.
• the magnetic ring 10 is therefore open and the two anchoring projections 12a, 12b are respectively secured to each of its free ends 16a, 16b.
• the locking projection 13 is in turn positioned substantially at equal distances from the anchoring projections 12a, 12b.
• each anchoring projection 12a, 12b and each locking projection 13 are integral with the same side wall of the magnetic ring 10, whether it is the side wall outer 14 or the inner side wall 15.
• each locking projection 13 is positioned substantially in opposition with respect to at least one anchoring projection 12a, 12b.
• each locking clip 23 is positioned substantially in opposition and facing at least one stop element 22a, 22b.
• This characteristic advantageously makes it possible to immobilize the ring magnetic 10 against the wheel 20, only with stop elements 22a, 22b and locking clips 23.
• the locking projection 13 indeed extends substantially in the same direction as the anchoring projections 12a, 12b, so that the radial immobilization of the magnetic ring 10 relative to the wheel 20 is not guaranteed by the combination of the stop elements 22a, 22b and the locking clip 23.
• the fixing device 1 is further provided with at least one element clamp 40a, 40b, 40c, 40d, 40e secured to the wheel 20, which is able to exert a substantially radial pressure force on a side wall 14, 15 of the magnetic ring 10.
• the device fastening 1 may include one or more clamping elements 40a, 40b, 40c, 40d, 40e facing the external side wall 14 and / or one or more clamping elements 40a, 40b, 40c, 40d, 40e facing the internal side wall 15.
• the device for f fastening 1 is provided with at least one clamping element 40a, 40b, 40c, 40d, 40e, the pressure force of which is oriented substantially in the direction of coupling of at least one anchoring projection 12a, 12b with the element corresponding stop 22a, 22b.
• This characteristic makes it possible to guarantee the radial immobilization of the magnetic ring 10 against the wheel 20.
• each clamping element 40a, 40b, 40c, 40d, 40e is here constituted by an elastically deformable protuberance, the distal part 41b, 41c is able to cooperate by contact with the external lateral wall 14 of the magnetic ring 10. As can be seen in FIG.
• the fixing device 1 is provided with five clamping elements 40a, 40b, 40c, 40d, 40e which are regularly spaced over the entire length of the side wall 14 of the magnetic ring 10.
• the clamping elements 40a, 40b, 40c, 40d, 40e positioned facing the same wall lateral 14, 15, will advantageously be distributed in a regular manner opposite the entire length of said lateral wall 15, 16.
• each abutment element 22a, 22b is able to exert a pressing force substantially axial on the corresponding anchoring projection 12a, 12b, when each locking clip 23 cooperates with the corresponding locking projection 13. This characteristic makes it possible to perfectly press the magnetic ring 10 against the wheel 20, and thus advantageously avoid the problems of play.
• each anchoring projection 12a, 12b has an axial bearing surface 17a, 17b which is inclined downward relative to the plane of the magnetic ring 10. This means in other words that the upper part of each anchoring projection 12a, 12b, on which the corresponding stop element 22a, 22b will exert its pressure force, is bevelled from top to bottom as one approaches its end distal 18a, 18b.
• each stop element 22a, 22b is provided with an axial bearing surface 27a, 27b concave, while the surface axial support 17a, 17b of each anchoring projection 12a, 12b is substantially planar.
• each anchoring projection 12a, 12b is substantially planar means that it can be completely planar or slightly convex, or even very slightly concave.
• the height of each anchoring projection 12a, 12b is substantially less than the height of the magnetic ring 10, and said anchoring projection 12a, 12b is moreover integral with the lower part of said magnetic ring 10. This characteristic makes it possible to free up a maximum of vertical space for each anchoring projection 12a, 12b.
• the corresponding stop element 22a, 22b is thus perfectly able to come over in order to achieve interlocking and to exert the axial pressure force, without however encroaching on the space located above the upper part 16 of the magnetic ring 10.
• the integrity of the magnetic sensors, which are associated with the magnetic ring 10, is therefore advantageously preserved.
• the distal part 18a, 18b of each anchoring projection 12a, 12b is bevelled so as to facilitate its insertion into the abutment element 22a, 22b corresponding.
• the fixing device 1 is provided further a guide flange 24 which is integral with the wheel 20, and which here is substantially complementary to the internal side wall 15 of the magnetic ring 10. It is noted that this guide flange 24 is advantageously positioned opposite the side wall 15 which is not intended to cooperate by contact with the clamping elements 40a, 40b, 40c, 40d, 40e, so as to also be able to act as a stop.
• the lower face of said magnetic ring 10 is internally chamfered and externally (Figure 7). According to another feature of the invention visible in particular in FIGS.
• each stop element 22a, 22b is formed at the end of a recess 25a, 25b which is capable of guiding the engagement of the projection of corresponding anchor 12a, 12b, when the magnetic ring 10 is inclined relative to the plane of the wheel 20.
• the invention also relates to any wheel 20 intended to be driven in axial rotation by an electric motor 110, supporting a ring magnetic pole 10, and comprising at least one fixing device 1 as described above.
• the invention also relates to any geared motor 100 provided with at least one such wheel 20.
• the invention further relates to any wiper mechanism provided with at least one such geared motor 100.
• the invention finally relates to any motor vehicle comprising at least one such wiper mechanism.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Mechanical Engineering (AREA)
• Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=34043767

Family Applications (1)

Country Status (10)

Families Citing this family (2)

Family Cites Families (6)

• 2003
  • 2003-08-01 FR FR0309623A patent/FR2858373B1/fr not_active Expired - Fee Related
• 2004
  • 2004-06-26 US US10/567,013 patent/US20060196294A1/en not_active Abandoned
  • 2004-07-26 BR BRPI0413088-0A patent/BRPI0413088A/pt not_active IP Right Cessation
  • 2004-07-26 CA CA002533507A patent/CA2533507A1/fr not_active Abandoned
  • 2004-07-26 EP EP04763492A patent/EP1649582A1/fr not_active Withdrawn
  • 2004-07-26 KR KR1020067002196A patent/KR20060076271A/ko not_active Application Discontinuation
  • 2004-07-26 JP JP2006522276A patent/JP2007500999A/ja active Pending
  • 2004-07-26 WO PCT/EP2004/008337 patent/WO2005029686A1/fr active Application Filing
  • 2004-07-26 MX MXPA06001264A patent/MXPA06001264A/es active IP Right Grant
  • 2004-07-26 CN CNA2004800218557A patent/CN1830132A/zh active Pending

Non-Patent Citations (1)

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