Classifications

• • 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
• • 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
  • F16H—GEARING
  • F16H1/00—Toothed gearings for conveying rotary motion
  • F16H1/28—Toothed gearings for conveying rotary motion with gears having orbital motion
• • 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
  • F16H—GEARING
  • F16H1/00—Toothed gearings for conveying rotary motion
  • F16H1/28—Toothed gearings for conveying rotary motion with gears having orbital motion
  • F16H1/46—Systems consisting of a plurality of gear trains each with orbital gears, i.e. systems having three or more central gears
• • 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
  • F16H—GEARING
  • F16H49/00—Other gearings
  • F16H49/001—Wave gearings, e.g. harmonic drive transmissions
• • 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
  • F16H—GEARING
  • F16H49/00—Other gearings
  • F16H49/005—Magnetic gearings with physical contact between gears
• • 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
  • F16H—GEARING
  • F16H57/00—General details of gearing
  • F16H57/02—Gearboxes; Mounting gearing therein
  • F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
• • 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
  • F16H—GEARING
  • F16H57/00—General details of gearing
  • F16H57/02—Gearboxes; Mounting gearing therein
  • F16H57/023—Mounting or installation of gears or shafts in the gearboxes, e.g. methods or means for assembly
• • 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
  • H02K11/30—Structural association with control circuits or drive circuits
• • 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
  • H02K11/30—Structural association with control circuits or drive circuits
  • H02K11/33—Drive circuits, e.g. power electronics
• • 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
  • F16H—GEARING
  • F16H57/00—General details of gearing
  • F16H57/02—Gearboxes; Mounting gearing therein
  • F16H2057/02034—Gearboxes combined or connected with electric machines

Definitions

• the present application relates to the field of rotary geared motors integrally combining an electric motor of the brushless type with a mechanical reduction gear having a high axial compactness, for example of the trochoidal or epicyclic type.
• the invention will find a privileged use in various automotive applications, such as for example for the actuation of a valve flap, of a needle for adjusting the flow rate of a liquid, of a camshaft phase shifter ...
• the output shaft on the one hand and the rotor assembly on the other hand are guided by bearings supported by the motor housing. This results in particular a risk of concentricity defect due to manufacturing tolerances which can impact negatively the performance of the motor and reducer, particularly the efficiency, reversibility and wear of the latter.
• the invention refers more particularly to a geared motor comprising an electric motor and a mechanical speed reducer, said electric motor having a cylindrical wound stator assembly forming a free interior space and a rotor assembly guided inside said interior space.
• said reduction gear being inside a housing secured to said stator assembly and having a set of movable gears, the output of said movable gears being secured to a movement output shaft, the input element of said movable gears being driven by said rotor assembly extending inside said housing
• said geared motor comprising a guide member of said output shaft, said output shaft being extended inside said motor to a guide member located at least in part inside said stator assembly characterized in that said rotor assembly is guided by positively guiding means formed between the interior surface of the rotor assembly and a surface of said output shaft.
• said guide means is constituted by a bearing, said guide means consists of a sliding bearing, said guide means comprises a coaxial combination of a bearing and of the tubular sleeve a flange integral with the stator assembly, said stator assembly is overmolded by an injectable plastic material forming in said interior space a support element for guiding said output shaft, said support element is a cylindrical bore receiving a rolling bearing or bearing to which the output shaft is guided, said support member is a cylindrical bore directly guiding the output shaft, said guide support element is a plain bearing obtained by a cylindrical bore directly produced in the overmolding of the stator assembly, said guide support element is an attached bearing, said housing and said overmolding are extended laterally by fixing eyelets corresponding, said overmolded stator is inside a flange, said housing and said flange being extended laterally by corresponding fixing eyelets, said input element having on its periphery a serrated shape collaborating mechanically with a fixed serrated shape integral
• FIG.l Figure 1
• Figure 2 an exploded perspective view of the embodiment shown in Figure 1
• FIG.3 Figure 3 a sectional view of a second embodiment of a geared motor according to the invention.
• FIG.4 Figure 4
• Figure 5 a sectional view of a fourth embodiment of a geared motor according to the invention
• FIG.6 Figure 6 a sectional view of a fifth embodiment of a geared motor according to the invention.
• FIG.7 Figure 7, a sectional view of a sixth embodiment of a geared motor according to the invention.
• FIG.8 Figure 8 a sectional view of a seventh embodiment of a geared motor according to the invention.
• FIG.9 Figure 9 a sectional view of an eighth embodiment of a geared motor according to the invention
• Figure 10 Figure 10 a sectional view of a ninth embodiment of a geared motor according to the invention
• FIG.11b Figures 11a and 11b, a sectional view of a tenth embodiment of a geared motor according to the invention
• FIG.12 Figure 12 an exploded perspective view of the embodiment shown in Figure 11,
• FIG.13 Figure 13 a sectional view of an eleventh embodiment of a geared motor according to the invention.
• FIG.14 Figure 14 an exploded perspective view of the embodiment shown in Figure 13,
• Figure 15 a sectional view of a twelfth embodiment of a geared motor according to the invention
• FIG.16 Figure 16 an exploded perspective view of the embodiment shown in Figure 15,
• Figure 17a is a perspective view in partial section and,
• FIG.17b Figure 17b an exploded perspective view and partial section, of a thirteenth embodiment
• FIG.18b Figure 18a and 18b of exploded perspective views and partial section and,
• Figure 19 an exploded perspective view of a fifteenth embodiment of a geared motor according to the invention.
• the geared motor comprises an electric motor (200) associated with a mechanical speed reducer (201), the electric motor (200) being composed of a stator assembly (2) and a rotor assembly (26) and the mechanical speed reducer (210) having a set of movable gears, the output element of said movable gears being integral with a shaft of motion output (19), the input member of said movable gears being driven by said rotor assembly (26).
• FIGS 1 and 2 show a first embodiment of a geared motor according to the invention.
• the latter comprises, in this example, a flange (1) inside which is positioned the stator assembly (2) of the brushless electric machine, this stator assembly (2) being here in the form of an assembly of sheets ferromagnetic overmolded in a plastic material to promote the strength of the electrical windings (3).
• the electrical windings have connections at their ends
• This circuit comprises a magnetic position measurement probe (24), for example a Hall probe, positioned in the extension of the output shaft (19).
• This printed circuit (5) may include all or part of the electronic components enabling the motor to be controlled. This embodiment does not limit the invention and the connection of the motor coils can be made using copper tracks (or “lead-frame”) if, for example, the power required is high.
• the printed circuit (5) can then be deleted or retained if it is necessary to have one or more position sensors intended to measure the position of the output shaft (19) of the set of movable gears or of the rotor assembly (26).
• the arrangement of the printed circuit (5) between the stator assembly (2) and the flange (1) allows very compact integration while promoting the evacuation of the heat generated by the printed circuit (5) using the flange ( 1).
• the stator assembly (2) is cylindrical in shape around the axis of rotation of the electrical machine and defines a free interior space (6) in which is placed a rotor assembly (26), typically but not limited to under the in the form of a magnetic ring (8) integral with a support (9) which may or may not have magnetic properties.
• a rotor assembly typically but not limited to under the in the form of a magnetic ring (8) integral with a support (9) which may or may not have magnetic properties.
• This embodiment of the rotor assembly (26) is not limiting of the invention and other embodiments conventionally used by those skilled in the art, for example without magnets or with magnets inserted in or on a ferromagnetic yoke, are envisaged. , the magnets can also be wholly or partly located in the stator part.
• This support (9) is extended towards the front of the rotor assembly (26) by a shaft (10) of which is integral the inner ring of a bearing (11) so that the axis of rotation of the bearing has an eccentricity with respect to the axis of rotation of the rotor assembly (26).
• the outer ring of the bearing (11) is integral with a disc-shaped gear wheel (12) having at its periphery a serrated shape (13).
• the invention is not limited to a rotor assembly (26) fully located inside the stator assembly (2), but extends to any type of arrangement that a person skilled in the art would consider.
• the rotor assembly (26) may have a bell shape so as to accommodate the stator assembly (2) within it while remaining guided by the output shaft (19) passing through the assembly. stator (2).
• stator assembly (2) we can also imagine an axial flow configuration well known to those skilled in the art for which the magnetically active parts of the stator assembly (2) and of the rotor assembly (26) face each other in the axial direction of the motor, the assembly rotor (26) nevertheless remaining guided inside the stator assembly (2).
• the stator assembly (2) integral with the flange (1), is inserted into a housing (14), forming an integral whole.
• the housing (14) has a serrated inner shape (15) which cooperates with the serrated shape (13) of the gear wheel (12) so that said gear wheel (12) performs cycloidal movement when driven by the rotor assembly (26) via the eccentric bearing (11).
• Embodiments comprising several wheels (12) are also envisaged but not shown.
• the serrated shape (15) of the housing is preferably made directly in the material of the housing (14) forming one and the same part as shown here, or else can be made as an independent part attached to the housing (14) if , for example, for robustness requirements, the serrated shape must be made of a material with better mechanical strength than the housing (14).
• the gear wheel (12) has a set of cavities (16) within which are positioned the axial extensions (17) of an output disc (18).
• This output disc (18) is guided in rotation around the axis of rotation of the electric machine by an output shaft (19).
• the gear wheel (12) By the cycloidal movement of the gear wheel (12) and the rotational guidance of the output disc (18), the latter is driven in rotation according to a mechanical reduction ratio imposed by the number of teeth of the serrated shapes (13 , 15) cooperating according to the teachings of the state of the art on trochoidal type reducers.
• the axial extensions (17) can alternatively be fixed and integral with the housing (14), the latter then serving as a support for the gear wheel (12).
• said gear wheel (12) describes a circular path movement, the serrated shape (15) and the output disc (18) then being rigidly linked or forming one and the same part.
• the gear wheel (12) may have two toothing profiles (13) which are not coplanar, one cooperating with the serrated shape (15) and the other cooperating with a second serrated shape rigidly linked to the output disc, the axial extensions (17) and the cavities (16) then being eliminated.
• the housing (14) has radial extensions complementary to radial extensions of the flange (1) and having fixing eyelets (36) intended to secure the geared motor according to the invention to any external member related to the application.
• the housing (14) has on the front of the geared motor a guide (20) receiving a bearing (21) guiding in rotation around the axis of rotation of the machine, the output shaft (19), the latter being extended at the front by a connecting shaft (22) to any external member linked to the application of the geared motor.
• the output shaft (19) is extended towards the rear of the gearmotor of so as to pass through the interior of the rotor assembly (26) and the interior space (6).
• the output shaft (19) is guided at the rear of the geared motor by a bearing (25) formed by an extension of the overmolding of the stator assembly (2) directly performing this guiding function without an attached guide element.
• the output shaft (19) of the set of movable gears is connected by a connection shaft (22) to an external member, however this direct connection mode is not limited to the invention and all types of indirect variations obvious to those skilled in the art are contemplated.
• the output shaft (19) of the set of movable gears could be coupled to the input wheel of a second set of movable gears articulated for example about a parallel axis or perpendicular to the output shaft (19), the output of this second set of movable gears possibly being integral with the means of connection to an external member.
• the output shaft (19) guides the rotor assembly (26) of the machine in rotation, here thanks to the use of two needle bearings (23) inside of the stator assembly (2). In this way, the rotor assembly (26) has effective guidance, over a large part of its length, provided by the output shaft (19).
• the output shaft (19) supports a magnet (7) facing axially a magneto-sensitive detection probe (24) serving for the detection of the angular position of the output shaft (19) .
• Position detection is not limited to a magnet / probe pair; other embodiments can be envisaged, such as detection of the inductive type (not shown).
• the inner and / or outer guide tracks of the bearings (11) or of the needle bearings (23) can be produced directly in the support parts, said support parts possibly being the output shaft (19), the support (9) or the toothed wheel (12).
• FIG. 3 presents a second embodiment of a geared motor according to the invention, very similar to the first mode presented in FIGS. 1 and 2.
• This variant differs from the first mode by two elements. Indeed, at the rear of the gear motor and of the output shaft (19), an additional guide element (251), here of the bearing type, is inserted between the bearing (25), which here serves as a bore d 'reception of the additional guide element (251), and the output shaft (19).
• the guiding of the rotor assembly (26) on the output shaft (19) is achieved by sliding the first onto the second, this embodiment then dispensing with the needle bearings (23) of the first embodiment. production.
• Any additional guide element (251) other than a bearing that a person skilled in the art would choose, depending on the functional constraints, can be considered.
• FIG. 4 shows a third embodiment of a geared motor according to the invention, very similar to the first embodiments presented in the preceding figures.
• This variant differs from these modes in that the previously described bearings (23) are removed.
• the rear of the output shaft (19) is guided by the extension of the overmolding forming a bearing (25), as shown in Figure 1, and the rotor assembly (26) is guided by the output shaft (19) by sliding, as shown in Figure 3.
• This minimalist and simplest and economical configuration will be preferred in particular when the cost constraint is significant and the transverse forces and the torque applying to the shaft. output are the least important.
• Figure 5 shows a fourth embodiment of a geared motor according to the invention, very similar to the first embodiment shown in Figures 1 and 2.
• This variant differs from the first embodiment in that the rear needle bearing (23) is removed and the rear guidance of the rotor assembly (26) by the output shaft (19) is achieved by sliding the first onto the second in order to offer an attractive cost and performance compromise, the guidance by rolling elements at the level of the eccentric absorbing most of the radial forces passing through the reducer.
• Figure 6 shows a fifth embodiment of a geared motor according to the invention, very similar to the first embodiment shown in Figures 1 and 2.
• This variant differs from the first embodiment in that the printed circuit (5) and the flange (1 ) have an opening through which the output shaft (19) passes so as to open out at the rear end of the geared motor in order to provide a double output.
• the magnet (7) is a ring integral with the output shaft (19) and is radially facing the magnetosensitive detection probe (24) serving for the detection of the angular position of said output shaft. (19), such as the patents W02007057563A1 or W02007099238A1 of the applicant.
• the detection of the position is not limited to a magnet / probe pair but encompasses other embodiments which may be envisaged by those skilled in the art, in axial or radial configuration, such as detection of the inductive type. or by optical sensor.
• Figure 7 shows a sixth embodiment of a geared motor according to the invention, very similar to the first embodiment shown in Figures 1 and 2.
• This variant differs from the first embodiment in that the output shaft (19) is not not extended by a connection shaft (22), and the output disc (18) is directly fixed to the system to be controlled by means of screws inserted into threaded holes (32) of said output disc (18).
• This embodiment makes it possible to absorb transverse forces as well as transmission and tilting torques on the output shaft (19) which are greater than for the first embodiment.
• this embodiment provides for replacing the ball bearing (21) with a double row bearing of larger diameter (33).
• FIG. 8 presents a seventh embodiment of a geared motor according to the invention, very similar to the second embodiment presented in FIG. 3.
• This variant has a failure prevention function commonly called “failsafe”.
• this function is obtained by the action of a spring (28) housed in the guide (20).
• Said spring (28) is integral with the housing at one end (30) and integral with the output disc (18) at its other end (29).
• the action of the spring (28) has the effect of returning the output shaft (19) to a chosen angular position.
• the incorporation of said spring limits the total angular travel of the output shaft (19) of the geared motor described by the invention.
• FIG. 9 shows an eighth embodiment of a geared motor according to the invention, very similar to the first embodiment shown in FIGS. 1 and 2.
• This variant differs from the first embodiment in that the rear needle bearing (23) is withdrawn.
• the guiding of the rear part of the rotor assembly (26) is provided by means of a bearing (252), integral for its inner part with the outer periphery of the extension of the overmolding, and inserted into a bore of the rear part of the rotor assembly (26).
• a spring (108) provides axial prestressing of the assembly.
• this prestress takes up the assembly clearances, prevents parasitic tilting of the disc (12) and thus prevents the geared motor from premature wear or even the generation of parasitic noise by ensuring proper engagement of the teeth.
• the axial preload can also be reinforced or achieved completely using the magnetic ring (8) of the rotor assembly (26) intentionally not centered axially with respect to the stator assembly (4), an axial magnetic force is then created, the magnetic ring (8) going naturally to refocus on the stator assembly (4)
• FIG. 10 presents a ninth embodiment of a geared motor according to the invention, very similar to the first embodiment presented in FIGS. 1 and 2.
• This variant differs from the first embodiment in that the axial compactness is greatly increased.
• the needle bearings (23) are arranged in series and the front guide (20) has a disc shape.
• a spring washer (151) is placed between a shoulder of the support (9) of the rotor assembly (26) and the bearing (11), said bearing (11). ) being slidably mounted on said support (9). The rotor assembly (26) is then pressed against the extension of the overmolding of the stator assembly (2).
• a friction washer (150) is then placed between said support (9) and said extension so as to limit the friction losses between these two elements in relative rotation.
• the spring washer (151) cancels the axial play between the gear wheel (12) and the output disc (18) which would cause noise and premature wear of these parts.
• the output disc (18) is then in axial abutment against an annular extension (153) of the guide (20), the relative speed between these parts being low, the friction is controlled by a good dimensioning of the elastic washer (151).
• the housing (14) is an integral part of the stator overmolding.
• the rotor assembly consists of a sheet metal package (152) on which is secured a magnet ring (8), for example by gluing, the sheet metal package (152) is then secured to the support (9).
• FIGs 11a, 11b and 12 show a tenth embodiment according to the invention, similar to the first embodiment shown in Figures 1 and 2.
• This embodiment is a particularly compact variant in the axial direction.
• This variant differs from the first mode in that the needle bearings (23) are removed and the guiding of the rotor assembly (26) by the output shaft (19) is provided by means of two bearings (37). and (38) inserted into bores of the hollow shaft (10) of the rotor assembly (26).
• Said bearing (37) receives an axial force from a spring (108) constrained at its other end by a washer (107) integral with the output shaft (19).
• This axial force is transmitted by said bearing (37) to the shaft (10) of the support (9) of the rotor assembly (26) via a stop (109), so as to generate an axial force ensuring the prestressing of the gear wheel (12) integral with said shaft (10) of the rotor assembly (26) on the output disc (18) integral with the output shaft (19).
• this prestress takes up the assembly clearances, prevents parasitic tilting of the disc (12) and thus prevents the geared motor from premature wear or even the generation of parasitic noise by ensuring proper engagement of the teeth.
• the axial play and tilting of the output assembly (18), (19) and (22) can be limited by limiting the axial play by means of the stop ring (41) and a friction disc (42) attached or produced by the housing (14).
• connection shaft (22) provides for interfacing by a splined cavity (34), and in that the stator assembly (2) comprises a guide flange (35) to ensure the rear guide of the output shaft (19), these embodiments not being, however, limiting of the inventions.
• This variant embodiment also differs from the first embodiment in that the flange (1) is not secured to the housing (14) by the fixing eyelets (36), but by screws directly housed in the overmolded stator assembly. (31). Finally, this variant differs from the first embodiment in that it incorporates a brake and safety locking system.
• this function is provided by the addition in the interior space (6) of a monostable magnetic actuator (100), but the invention is not limiting to this technology.
• Said magnetic actuator (100) consists of a ferromagnetic bell (101) having an inner annular extension. Said inner annular extension being assembled without play on said guide flange (35) of the stator assembly (2), the inner part of said guide flange (35) forming a bearing (25) guides the output shaft (19) .
• Said ferromagnetic bell (101) is closed by a ferromagnetic disc part (103) being mounted with play on the same external part of the extension of the overmolding and being guided in translation by an axial singularity (110) of the bell (101) cooperating with a complementary shape (111).
• Said disc portion (103) has axial teeth (105) on its outer periphery which cooperates with a crown (106) inserted in an annular recess of the shaft (10) and having complementary teeth (115), so as to block the rotation of the rotor assembly (26) when said teeth (105, 115) are nested.
• Said magnetic actuator (100) is characterized in that in the rest or fault state, the interlocking of the teeth (105, 115) is ensured by a spring (104) inserted in the internal cavity of the bell (101 ) and coaxial with the output shaft (19), said spring (104) being axially supported at one of its ends on the radial expansion of the bell (101) and at the other end on the expansion radial part of the disc (103).
• a spring (104) inserted in the internal cavity of the bell (101 ) and coaxial with the output shaft (19), said spring (104) being axially supported at one of its ends on the radial expansion of the bell (101) and at the other end on the expansion radial part of the disc (103).
• an annular coil (102) inserted into the cavity of the bell (101) and integral with said bell, which generates a magnetic force of attraction between the bell (101) and the disc part (103) when it is crossed by a current.
• Said magnetic force opposes the force of the spring and makes it possible to eliminate the contact
• Figures 13 and 14 show an eleventh embodiment of a geared motor according to the invention, very similar to the first embodiment shown in Figures 1 and 2.
• This variant differs from this embodiment in that the reducer is of the type epicyclic.
• the rotor assembly (26) no longer drives the gear wheel (12) via the bearing (11), but has a serrated shape (27) at its end which cooperates with the serrated shapes ( 13) multiple gear wheels (12).
• the multiple gear wheels (12) are guided in rotation by axial extensions (17) of the output disc (18) integral with the output shaft (19).
• the example illustrated is not limiting of the invention, the number of satellites (12) and the type of epicyclic reduction gear, here of simple type, can be modified, the person skilled in the art would also consider integrating a compound train.
• Figures 15 and 16 show a twelfth embodiment of a geared motor according to the invention. It differs from the previous embodiments in that it comprises two different juxtaposed reduction modules, the first being a trochoidal reduction gear and the second an epicyclic reduction gear.
• the rotor assembly (26) is guided by sliding bearings on the output shaft (19).
• the shaft (10) of the rotor support (9) guides a gear wheel (12) eccentrically with respect to the axis of rotation of the rotor assembly (26).
• the disc-shaped gear wheel (12) has a serrated shape (13) at its periphery.
• the housing (14), integrated into the overmolding of the stator assembly (2), has two serrated internal shapes (15, 125), the first serrated shape (15) cooperating with the serrated shape (13) of the gear wheel (12) such that said gear wheel (12) performs cycloidal motion when driven by the rotor assembly (26) via the eccentric guide ring (129) to form the first reduction stage, the second serrated shape (125) cooperating with multiple planet gears (122) to form a second reduction stage.
• the gear wheel (12) has a set of cavities (16) inside which are positioned pins (120) integral with a planet carrier (121). Said pins each guide a satellite gear wheel (122) having on its outer periphery two serrated shapes (123, 124), the first serrated shape (123) cooperating with the second serrated shape (125) of the housing (14).
• the output disc (18) has a serrated inner shape (126) cooperating with the second serrated shape (124) of the satellite gear wheels (122).
• the output disc (18) is overmolded on the output shaft (19) and guided by slide bearings (127) on interior surfaces of the overmolding of the stator assembly (2) and of the stator assembly (2).
• guide (20) Said output disc (18) also has a protuberance (128) cooperating with a complementary shape of the member to be controlled. The complementary shape of the controlled member being guided by the inner surface of the guide (20).
• Said output shaft (19) is guided at the other end of the geared motor, on the one hand, by a protuberance of the overmolding of the stator assembly (2) forming a bearing (25), and on the other hand, by a protuberance of the flange (1) forming a bearing (130).
• the output shaft (19) is secured to a U-shaped part (131) by stamping. Said U-shaped part (131) having a second means of interfacing with the member to be controlled.
• the guides are produced by plain bearings, but the other alternatives of add-on parts that a person skilled in the art would consider are not ruled out, by way of example, the guide ring (129 ) can advantageously be replaced by a bearing so as to limit the friction in this critical zone.
• the housing (14) is an integral part of the stator overmolding and is not linked to the flange (1) by fixing eyelets (36), not visible here, but by screws directly housed in the assembly. overmolded stator (31).
• Figures 17a and 17b show a thirteenth embodiment, very similar to the embodiment shown in Figure 10.
• This variant differs from this embodiment in that the gear wheel (12) comprises deformable hooks (50), capable of being clipped onto a face (53) of the output wheel (18), passing through the cavities (51), so as to eliminate the degree of axial freedom between the gear wheel (12) and the wheel outlet (18).
• the axial joining of these two parts prevents the appearance of vibrations and the premature wear which accompany them and limits the misalignment penalizing the operation of the reducer.
• hooks (50) integrated into the gear wheel (12) is not limiting on the invention, the hooks (50) being able alternatively to be integrated into the output wheel (18) and the cavities (51 ) to the gear wheel (12), but those skilled in the art could also imagine all kinds of solutions aimed at constraining axial displacement between the output wheel (18) and the gear wheel (12) while leaving free mobility in an orthogonal plane.
• This embodiment also differs in that a ring (52) made of a very rigid material, such as steel, is inserted on the outer periphery of the housing (14) at the level of the indented inner shape (15), so as to compensate for the radial deformations of the housing (14) due to the forces between the gear wheel (12) and the internal serrated shape (15).
• This ring (52) is particularly useful when the inner serrated shape (15) is an integral part of a plastic housing (14).
• the use of such a ring (52) is nevertheless not conditioned on the use of plastic materials, but can be considered as soon as the forces involved are too great and risks deforming the indented inner shape (15).
• the use of such a ring (52) is not limiting to the embodiment presented and can be attached to the periphery of the stator assembly (2) when the indented inner shape (15) is directly produced in its overmolding.
• Figures 18a, 18b, 18c and 18d show a fourteenth embodiment. It differs from the previous embodiments in that it comprises an external rotor motor and a so-called deformation wave or elliptical reduction gear.
• the rotor assembly (26) is sandwiched by the stator assembly (2), the latter also performing the function of an overmolded casing (14), this embodiment however not being limited to the casing. can be a separate part and attached to the stator assembly.
• the rotor assembly (26) and more particularly the magnetic ring (8) cooperates magnetically with the field created by the coils (3) of the stator assembly (2) on the outer radial periphery of the stator.
• the rotor assembly (26) is guided at least in part in the interior space (6) of the stator assembly (2) by bearings (37), or plain bearings, inserted between the support (9) of the rotor assembly (26) and the output shaft (19).
• Said output shaft (19) itself being guided by a plain bearing (25) or by means of a rolling element (not shown).
• the shaft (10) of the rotor support (9) guides an elliptical plate (300) composed of an elliptical hub (301) supporting a special bearing (302) deforming the external toothed deformable bush (303) which meshes with the ring gear internal toothed (304).
• the latter can be attached, overmolded or form an integral part of the stator assembly (2) or of the housing (14).
• the rotatably driven elliptical plate (300) deforms the toothed bush (303) which has a slightly lower number of teeth, generally two fewer teeth, than the inner ring gear (304).
• said internal toothed ring (304) is most often static and the reduced output movement is taken up by the deformable bush (303), here linked to the connection shaft (22) forming a large diameter plate allowing transmission. high loads on the device to be controlled and thereby closing the actuator.
• the sleeve (303) can be locked in rotation and the output movement can then be transmitted by the crown (304).
• connection shaft (22) is here guided by a large-diameter bearing (21) advantageously located close to the meshing plane of the reducer and capable of directly sealing the system (or via a dynamic seal, not illustrated).
• the shaft (19), shown here, is hollow for the purpose of lightening the mass of the system.
• the hollow shaft (19) can make it possible to obtain an output on each side of the actuator and / or allow the passage of a fluid, cables, axis, etc., through the actuator.
• Fig. 19 shows an exploded view of a fifteenth embodiment.
• This is a variant of the first embodiment for which the gear wheel (12) has axial extensions (17) cooperating with cavities (16) here made in an insert (401) rigidly linked to the 'stator assembly (2).
• the eccentric shaft (10) drives the disc (12) with a circular translational movement and the reduced rotational movement is then recovered by the indented inner shape (15) then rigidly linked to the output disc (18) in order to to form a single piece, the latter here advantageously surrounds the serrated shape (15) in order to stiffen it and limit its ovalization under load.
• the cavities (16) can be made directly in the disc (12) or via one or more inserts, and the axial extensions (17) can be made by the insert (401).
• the insert (s) (401) can be clipped, screwed or overmolded in the housing (14) or in the stator assembly (2), the cavities (16) or axial extension (17) being able to be produced directly by means of the overmolding of the disc (12) or of the stator assembly (2).
• the rotor assembly (26) is produced by means of magnet blocks (8) inserted in the ferromagnetic yoke (9), itself driven out or overmolded on the axis (10).
• This variant also presents an encoder (405) which can be magnetic, ferromagnetic or of the optical barrier type makes it possible here to obtain the position of the rotor assembly (26) via a probe or sensor (not shown) linked to the printed circuit (5). ) or placed independently.
• this variant embodiment uses a seal (406) making it possible to ensure the seal between the housing (14) and the rotor assembly (2) here overmolded.

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

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• 2020
  • 2020-04-15 FR FR2003796A patent/FR3109481A1/fr active Pending
• 2021
  • 2021-04-15 WO PCT/FR2021/050667 patent/WO2021209723A1/fr unknown
  • 2021-04-15 KR KR1020227039470A patent/KR20230002651A/ko unknown
  • 2021-04-15 CN CN202180031017.1A patent/CN115461968A/zh active Pending
  • 2021-04-15 EP EP21725573.6A patent/EP4136739A1/fr active Pending
  • 2021-04-15 US US17/996,167 patent/US20230198337A1/en active Pending
  • 2021-04-15 JP JP2022562764A patent/JP2023521451A/ja active Pending

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