• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to an actuator of the braking segments within a drum brake of a motor vehicle, in particular with electric motor. It also relates to a brake equipped with such an actuator, for example a drum-in-hat composite brake or a dual-mode drum brake combining a service brake in simplex mode and a parking brake in dual mode. servo ". The actuator comprises a linear actuating assembly comprising a screw-nut system and is adapted to move away from the ends of the braking segments. This screw-nut system is driven by a transmission subassembly itself driven by an electric motor. This transmission subassembly rotates an actuating element of the linear actuating assembly by a slide connection. In particular, this actuating element is movable in translation in a single direction and integral in rotation with a toothed wheel of the transmission subassembly.
    公开号:FR3016011A1
    申请号:FR1363702
    申请日:2013-12-30
    公开日:2015-07-03
    发明作者:Cedric Guignon；Gerard Luu；Christophe Dupas；Thierry Pasquet；Alberto Molinaro
    申请人:Chassis Brakes International BV；
    IPC主号:
    专利说明:

    [0001] The present invention relates to an actuator of the brake shoes of a motor vehicle drum brake. It also relates to a brake and a braking device equipped with such an actuator. State of the art Drum brakes are typically used in motor vehicles in order to achieve three types of braking: - service braking, which consists of slowing down and / or immobilizing the vehicle, typically via a pedal braking; - Parking braking, which immobilizes the vehicle at a standstill, typically by means of a handbrake; Emergency braking, which consists in slowing down and / or immobilizing the vehicle in the event of failure of the service braking, and which is typically provided by the same device as the parking brake. In most vehicles equipped with drum brakes, it is known that these three types of braking are performed by the same drum brake. Specifically and typically, the parking braking function is provided by a cable connecting a handbrake control located in the passenger compartment, with a lever pivoting in the drum around a moving end of a first braking segment and spreading a second braking segment via a reaction rod. The use of a drum brake thus actuated by hand or under a relatively low force provides a braking torque which may be insufficient to provide parking braking and especially emergency braking. A drum brake typically comprises a drum, coaxial with the wheel, and consisting of a hollow cylinder integral with the workpiece to be braked. Braking segments equipped with brake linings may rub on the inner surface of the drum. For braking, while the first ends of the segments bear tangentially to the rotation on a stop plate integral with a rotatably immobilized plate, second ends of the segments are spaced apart from each other for rotation. apply the trim against the inside of the drum. Consequently, any movement or force in rotation of the wheel imparts a rotational torque to the segments, which they transmit to the plate at least in part by this abutment plate. In general, the two segments are actuated at their two ends on the same side, typically by the same hydraulic actuator with double piston and fixed to the plate, in a mode of operation called "simplex". In another type of drum brake, called "duo-servo", a floating link ensures the transmission of effort from one segment to the other segment. In particular, an actuator moves the first end of a first segment which rests on the drum while its second end is supported, via the floating link, on the second end of the segment, floating too. Thus, the first end of the second segment is the only one to bear on a stop plate. This type of brake is much more effective for a given actuation effort, but has other disadvantages, especially because it is more difficult to adjust and wear irregularly. Duo-servo-type drum brakes are often used exclusively as a parking and emergency brake, for example by using the inside of the center disk bell of a service disc brake as a drum, a combination called "drum- in-hat "and described in EP 0 416 760. Another type of brake is to combine the simplex type to perform the service braking and the duo-servo type to perform the parking and emergency braking. In this spirit, the document FR 2 697 599 proposes to add a mechanical actuator near the stop plate. This actuator is supported on one side on the first end of a first segment and the other on the end of an additional lever acting on the other segment. In addition, it is known to electrically activate the brake segments of a drum brake. Thus, the document US Pat. No. 8,011,482 describes a mechanism in which the braking segments are actuated by a rod moved in translation by a screw-nut system which is actuated in rotation by a gear itself actuated in rotation by a electric motor. EP 2 195 219 discloses a parking brake system in which the brake shoes are actuated by a threaded element moved in translation by means of a wheel driven by a worm integral in rotation with the spindle. output of an electric motor. An object of the present invention is to provide a motorized actuator of the brake segments of a drum brake which allows simple and flexible manufacturing and / or assembly and / or maintenance operations, and provides reliable operation, with good power performance in good compactness, and reduce or limit production costs.
    [0002] DESCRIPTION OF THE INVENTION The invention proposes a linear actuator for a vehicle drum brake, in particular a motor vehicle, characterized in that it comprises: a linear actuation assembly including a screw-nut system formed by a rotary screw element and a second threaded element, arranged to actuate the drum brake by moving the first ends of the braking segments away from one another in an actuating direction, under the effect of a rotation drive of the threaded element rotatable vis-à-vis the second threaded element; - a rotary motor; a transmission subassembly driven by the motorization and rotating the rotary threaded element by a sliding connection in the direction of actuation. Advantageously, the linear actuation assembly is enclosed in a housing in which it is movable in translation, in the direction of actuation, between two end positions in each of which it abuts by bearing a shoulder carried by the actuating assembly against a surface carried by this housing. Unlike prior art solutions using a worm gear system, the choice of using a transmission gear may require more parts to achieve the required gear ratio. However, the invention proposes not to use such a worm system. The invention provides a good energy efficiency of the transmission from the engine, which allows to obtain a greater clamping force or a higher clamping speed or to use a less powerful engine, or a better compromise between these performances . In addition, the slide connection allows axial sliding of the actuating assembly during the spacing of the braking segments.
    [0003] According to improvements of the invention: the transmission subassembly comprises gear wheels meshing with each other and mounted to receive the rotary movement of the motorization by a driving wheel and to drive the rotary threaded element by a driven wheel carrying a axial bore which surrounds the rotatable threaded member, which bore carries on the inner surface of the driven wheel an inner drive shape which cooperates with an outer drive shape carried by the outer surface of the rotatable threaded member for driving the latter in rotation while allowing them to slide in translation in the direction of actuation; the driving forms of the rotary threaded element of the screw-nut system and / or the bore of the driven wheel comprise splines; the drive forms of the rotary threaded element and / or the bore of the driven wheel, and preferably both, have a cross section to the actuation direction whose profile is radially tapered, in particular trapezoidal manner, so as to exert on the rotatable threaded element a centering force in the bore during the transmission of torque; the rotating threaded element forms the nut of the screw-nut system; - The transmission subassembly comprises a plurality of wheels whose axes are parallel to each other and to the direction of actuation, and these wheels meshing with each other by teeth with external contacts; the transmission subassembly forms a pre-assembled element within a carcass comprising two parallel plates between which the gears are held, and which carry circular orifices accommodating shafts projecting from gears to form gears; bearings holding them radially in position; the actuator comprises a first housing, called main housing, receiving the screw-nut system in an actuating housing, which intersects a housing receiving a driven wheel located at the output of the transmission subassembly and driving the rotary threaded element; , and the actuator comprises a second housing, said secondary housing, which is assembled with the main housing to enclose the transmission subassembly; the linear actuating assembly comprises in series with the screw-nut system an elastically deformable element, at least in the direction of actuation, under the effect of a spreading force applied to the segments by the screw system; nut. The presence of a pre-assembled subassembly within the actuator greatly simplifies the assembly and maintenance steps and thus helps to reduce production and maintenance costs in a systematic way. It also ensures a more precise positioning of the gears with each other, which ensures better energy efficiency and less wear of the teeth.
    [0004] Another aspect of the invention has other advantageous features according to which the invention may consist of a drum brake in which the two segments are mounted on a plate so as to be able to deviate from each other for come to bear on the friction track carried by the inside of a rotating drum relative to the plate, the linear actuator being arranged to separate the two segments by their two first ends vis-à-vis the one the other. In such a brake, according to a feature, the two segments are articulated to a rod movable relative to the plate and which connects them between 30 in the vicinity of their second ends, opposite to the first ends, the link being able to transmit the one of the segments to the other segments a force that pushes the other segment against a fixed anchor element relative to the plate. According to another feature, the brake further comprises a second actuator providing a second braking function, in particular of service, this second actuator being arranged to move the second ends of the two segments apart from one another while the second first ends abut in relation to the plate.
    [0005] Finally, according to a third aspect, the invention consists of a braking device for a vehicle or a subset of a vehicle, in particular a road vehicle, comprising a brake disc interacting with brake pads to perform a second braking function, in particular a brake function. service, this device comprising a brake arranged to provide a first braking function, including parking brake and / or emergency, wherein the drum is secured to and coaxial with the brake disc. List of Figures Other features and advantages of the invention will become apparent from the detailed description of a non-limiting embodiment and the accompanying drawings in which: - FIGURE 1 is a perspective view of a dual-mode drum brake In an exemplary embodiment of the invention shown without the drum; - FIGURES 2, 3 and 4 are diagrams showing, in front view, the operation of the brake of FIGURE 1 in different positions during operation parking brake: FIGURE 2: when tightening, stationary vehicle, 25 o FIGURE 3: once tightened, with holding torque in a direction of rotation, and FIGURE 4: once tightened, with holding torque in the opposite direction; FIGURE 5 is a partial exploded view prior to mounting of the parking or emergency brake actuator and the brake support plate of FIGURE 1; FIGURE 6 is a perspective and partial cutaway view of the parking brake or emergency brake actuator of FIGURE 1, in an embodiment with electric motorization; FIGS. 7 and 8 are exploded views of the parking or emergency brake actuator of FIGURE 6; FIGURE 9 is a transparent perspective view of the mechanical transmission of the parking or emergency brake actuator of FIGURE 6 in a presently preferred embodiment. Description of an Exemplary Embodiment In the embodiment presented here, the drum brake 1 comprises the linear actuator 2 according to the invention as well as a second actuator 11 which each allow a different operating mode. These two modes of operation are controlled to provide two different braking functions. In this embodiment, the linear actuator 2 according to the invention is used to provide a parking brake and emergency function, and the second actuator 11, for example a hydraulic wheel cylinder of a known type with two pistons. opposite, is used to provide a service brake function. The drum brake 1 causes a braking torque between the drum 15 and the plate 10 movable in rotation relative to each other about an axis of rotation A1. Typically, the plate 10 is fixed in rotation on the chassis of the vehicle, usually by means of a suspended train or half-train. The drum is secured to the wheel, and is fixed in translation and guided in rotation about the axis Al by the hub and its bearings, not shown here.
    [0006] In service brake mode (not shown here), the braking torque is generated by a friction between: - on the one hand, the friction track carried by an inner surface of the drum 15, - and on the other hand friction 123, 133 carried respectively by a first 12 and a second 13 segments. This friction is obtained when the second actuator 11, fixed to the plate 10, spreads the segments outwards. The return to the rest position is achieved for example by return springs, visible in FIGURE 1, interconnecting the two segments 12, 13. In this example, the drum brake 1 is arranged to operate in the simplex when actuated as a service brake: the two opposed pistons of the wheel cylinder each actuate one of the segments 12, 13 by separating their second ends vis-à-vis 121 from each other 131 at the top of FIGURE 4. At opposite ends, said first ends 122, 132, each segment is supported on an anchoring element which is integral with the plate and transmits at least in part the braking torque between segment and tray. In this example, the anchoring element of the two segments is formed by a first housing 21 of the linear actuator 2 by which it is secured to the plate 10. This attachment secured to the first housing 21 on the plate 10 is illustrated symbolically in FIGURES 2 to 4 by the symbol of the earth, below and in the middle of the figures. As illustrated in FIGS. 2 to 4, the linear actuator 2 according to the invention, dedicated to operation as a parking or emergency brake, comprises a linear actuating assembly 3 which bears on the first ends 122, 132 of the segments 12, 13 to separate them from one another, and thus put the segments in abutment against the friction track of the drum 15, from the rest position, or the service braking position. The return to the rest position is achieved for example by return springs interconnecting the two segments.
    [0007] FIGS. 6 to 8 represent the linear actuator 2 in a version where it is driven by an electric motor included in a geared motor 5, via a transmission gear 4. In this example, the actuating assembly linear 3, made by a screw-nut system, includes a first piston 33 and a second piston 32 which are displaced relative to each other in a linear movement, in a direction D2 tangential to the axis of rotation Al As shown in FIG. 2, this displacement brings the two pistons respectively bearing on the first two ends 122, 132 of a first segment 12 and a second segment 13. In the embodiment of FIG. 1, the linear actuating assembly 3 comprises a rotatable threaded element 31 and a non-rotatable threaded element 32 interacting with each other to form a screw-nut system. In the example shown, the rotating threaded element is a nut and the non-rotating threaded element is a screw. Their common axis corresponds to the actuation direction D2. This screw-nut system produces the linear movement under the effect of a rotation of the rotatable threaded element 31 with respect to the threaded element 32. It transforms the torque received by the rotary element 31 into an axial force that solicits the two elements 31, 32 relative to each other in the direction D2 (see FIGURE 2). The helix angle of the thread relative to the circumferential direction of this screw-nut system is chosen so that the transmission of effort obtained is irreversible. For this, the helix angle is chosen to be less than the friction angle cp which characterizes the force resistant to the sliding movement between the two threads, particularly as a function of their respective material, their surface state, the lubricant used. The irreversibility thus obtained provides the locking function in the parking braking position. That is to say that an axial force received by the pistons 32, 33 from the segments 13, 12 is blocked by the non-slip between the threads of the two elements 31, 32 of the screw-nut system. Such a force is unable to cause rotation of the rotary member 31 and therefore a variation of the total length of the screw-nut system in the direction D2. In addition, the effort is not transmitted to the engine, thus making it unnecessary to block the engine or keep it in charge.
    [0008] As illustrated in FIGS. 3 and 4, when the segments 12, 13 are supported on the drum 15, if a rotation torque, in a direction C4 or in the other C5, is applied to the segments 12, 13 by the drum 15, for example because the vehicle is parked in a slope or the emergency brake is actuated when the vehicle is moving, the segments 12, 13 tend to be rotated in the direction of this torque. FIG. 4 illustrates more particularly the case of a torque C5 in the clockwise direction. By friction, the first segment 12 thus receives a torque C52 from the drum 15. By its second end 121, opposite to the first end, the first segment 12 bears on an intermediate element 14 by a hinge 142, for example a pivot connection or other forms of cooperation such as notches engaged with each other. Under the support of the first segment 12, the intermediate element 14 thus transmits a support C23 to the second end 131 of the second segment 13, substantially tangentially around the axis of rotation Al. The second segment 13 thus bears on the track of the drum 15, and also receives by friction a torque C53 from the drum. By its first end 132, the second segment transmits this torque C53 to the second piston 32. The linear actuating assembly 3 is mounted free in tangential translation about the axis of rotation A1, on a limited stroke by a stop of each side of its central position. In the direction of rotation of FIG. 4, under the effect of the couples C52 and C53 received from the drum 15, the segments thus have the effect of moving the linear actuating assembly 3 in the direction of these pairs, either in a direction D22 according to the white arrow to the left and to the stop position illustrated in the figure.
    [0009] Thus, in the parking brake or emergency mode and with this direction of torque, the first end 132 of the second segment 13 bears on the housing 21 of the actuating device to transmit to the plate 10 the braking or holding torque created by the support of the segments on the drum.
    [0010] In the present example, the first end 132 of the second segment 13 and the housing 21 of the linear actuating assembly 3 bear against each other via the second piston 32, for example by a suitable conformation , here a shoulder 329 carried by the piston vis-à-vis the outer surface of the housing 21 at the vertical line dotted line in the figure. In the direction of rotation visualized in FIG. 4, the segment whose first first end 122 receives first the movement of the drum is the segment 12 on the left in the figure, which pivots and leans on the pivot 142 of its second end. and thus forms a "compressed" segment. In a close manner, thus receiving a tangential force by its second end 131, the second segment 13 also behaves in a "compressed" segment while arching on its first abutment end 132 Thus, in parking brake or emergency mode , the activation of the linear actuator 2 operates the brake in duo-servo mode, which provides a support force against the drum much greater than the simplex mode of the service brake, for a given actuation force of the segments.
    [0011] In the direction of rotation shown in FIG. 3, a torque C4 in the other direction drives the segments 12, 13 and the intermediate element 14 in the other direction, which moves the linear actuating assembly 3 into a direction D23 opposite, according to the white arrow to the right and to the stop position shown in the figure. The braking torque is then transmitted to the housing 21 through the first end 122 of the left segment 12, through the shoulder 339 of the first piston 33, at the vertical line in phantom in the figure. This dual-mode drum brake mechanism is here shown in FIGURES 1 and 4 in an example with a second service brake actuator 11 operating by hydraulic energy, and a linear actuator 2 of parking and emergency brake operating by electrical energy. . However, the architecture of this mechanism can also work and is also provided with other types of energy for each of these actuators, for example by hydraulic energy or directly by mechanical control. In case of activation of the second hydraulic actuator 11, the two second ends 121, 131 are sharply spaced from each other while the first two ends 122, 132 are supported on the housing 21 via the shoulders pistons 32, 33, the linear actuating assembly 3 being retracted.
    [0012] In the present example, the intermediate member 14, typically a link, also carries the play compensating mechanism resulting from the wear of the packings 123, 133, as illustrated in FIGURE 1. One of the elements of the set of Linear actuation 3 is a so-called spring element 33, also known as a spring package, which is elastically deformable by compression along the axis of the actuating movement. The elastic element, mechanically mounted in series with the screw-nut system between the two first ends 122, 132 of the segments 12, 13, makes it possible to store mechanical energy during the activation of the linear actuator 2, to maintain the braking force or absorb the deformations during the various circumstances that may occur during the period of immobilisation of the vehicle.
    [0013] In the embodiment of FIGURES 5 and 8, the linear actuator 2 comprises a first housing 21 which contains the linear actuating assembly 3. This first housing 21 is essentially located inside the drum 15 and fixed on a front or inner face of the plate 10. The first housing 21 is engaged in an opening 100 of the plate 10 and substantially sealing the opening 100 with respect to the external environment of the brake. The first housing 21 also serves as a stop transmitting the braking or holding torque between the segments 12, 13 and the plate. This first housing 21 is made for example of molded metal and machined, for example cast aluminum. A second housing 23 adjacent the rear or outer face of the plate 10 is attached to the first housing 21 in the area surrounded by the opening 100. The interior space of the second housing 23 and a housing 22 of the first housing 21 communicate with each other. through the opening 100 forming for the transmission assembly 4 a housing which extends through the opening 100. This housing is sealed against the outside by an annular seal line between them. two housings substantially along the periphery of the opening 100. The geared motor 5 is fixed to the second housing 23 so that the axis of the geared motor 5 and the direction of actuation D2 (see FIGURE 2) of the actuating assembly linear 3 are substantially parallel. The housing 22 of the first housing 21 receives a portion of the transmission subassembly 4 including the driven wheel 43. This housing 22 intersects the housing 217 formed by a bore passing through the first housing 21 and receiving the actuating assembly. 3. The second housing 23 comprises a housing 24 which receives the drive wheel 41 of the transmission subassembly 4. The second housing 23 has tabs 232 which pass through the opening 100 of the plate 10 and extend between the first housing 21 and the tray 10 to be tightly clamped when attached to each other. The prior assembly of the two housings 21, 23, before the fixing of the first housing 21 on the plate 10, thus requires only very simple fixing means, for example a simple latching or a single screw 231 as shown in FIG. 8.
    [0014] The walls of the housings 22 and 24 of the housings 21, 23 have grooves positioned to form a guide in translation of the transmission subassembly 4 during its insertion, for example by guiding spacer heads and shaft wheels which protrude outwardly from the transmission sub-assembly 4. Once the transmission subassembly 4 is in place in the first housing 21, its driven wheel 43 is in place in the housing 217 of the linear actuating assembly 3 , whose elements 31, 32, 33 can then be inserted therein. The second housing 23 is also provided with a housing 25 which receives the output shaft of the geared motor 5, and on which its housing 51 comes to assemble tightly and non-rotatively. Once the transmission subassembly 4 in place in the housing 24 of the second housing 23, its input wheel 41 is in place in the housing 25 of the geared motor whose output shaft can then be inserted.
    [0015] The embodiment which has just been described is in no way limiting. In particular, the elements specific to the linear actuator 2 of the parking brake or emergency brake can be integrated as such within any type of drum brake, including a single-mode drum brake type duo-servo used alone, or implanted as a single-mode parking brake within a drum-in-hat type disc brake. In the embodiment shown in FIGURE 9, the transmission subassembly 4 is a pre-assembled subassembly, referred to as a gear cartridge, comprising a casing which supports wheels 41, 42, 43, to helical and external contact teeth, and which keeps them in their operating position, regardless of their external environment. The pre-assembled subassembly simplifies assembly and maintenance, and reduces production costs. In addition, it guarantees more easily and more precisely an optimum value for the relative positioning of the gears, in particular their centers, in view of an optimal transmission efficiency. In the present example, the casing of the gear cartridge 4 comprises two parallel plates 48, 49 identical, for example metallic, held together by connecting pieces 471, 472, 473 forming spacers. These are screwed, riveted or fitted into the plates. The gears 41, 42, 43 are held between the plates 48, 49 and their shafts 419, 473, 439 are positioned in openings in the plates as bearings. The shaft of some toothed wheels, in particular the intermediate wheel or wheels, here the shaft 473 of the intermediate wheel 42, also acts as a spacer. Characteristically, the driven wheel 43 of the gear cartridge 4 drives the rotary nut 31 of the screw-nut system by an axial bore 430 having an inner shape 431, here fluted, surrounding the nut 31 and co-operating with its outer shape 312. The inner shape 431 of the driven wheel 43 and the outer shape 312 of the nut 31 together form a sliding link free in translation, and their respective geometries are determined to allow axial sliding, in the direction of actuation D2, of sufficient length to allow the linear actuating assembly 3 to slide completely until it comes into abutment with one side 329 or the other 339 depending on the direction of the braking or holding torque to be transmitted. . Such a configuration allows an axial sliding of the nut 31 relative to the wheel 43 during the transmission of torque between them. It also allows the assembly of the linear actuating assembly by axial sliding, as described above, once the driven wheel 43 in the appropriate position in the housing 21. In an example of implementation of this mode As a result, the toothings and dimensions of the gear cartridge were determined to produce a reduction ratio of 2.86: 1 for a yield of between 0.89 and 0.94.
    [0016] Nomenclature 1 drum brake support plate 100 platen opening 10 12, 13 braking segments 121, 131 second ends of the segments 122, 132 first ends of the segments 123, 133 friction linings 14 spacer element - play adjustment link 142 articulating joint insert element 15 wheel drum 11 second actuator - service brake 2 linear actuator - parking or emergency brake 21 first linear actuator housing 217 housing receiving linear actuator assembly 22 cartridge housing in the first housing 23 second linear actuator housing 231 screw securing the second housing to the first housing 232 securing brackets of the second housing 24 housing the cartridge to the second gear housing housing 25 to the second housing 3 linear actuating assembly 31 nut fluted screw-nut system 312 external grooves of the nut 32 screw screw-nut system 329 screw support shoulder - braking torque transmission 33 linear elastic piston - "spring package" 339 elastic piston bearing shoulder - braking torque transmission - 16 - 4 transmission subassembly - gear cartridge 41 1 ° gear wheel - drive wheel 419, 439 shafts of 10 and 3 ° gear wheels 42 2 ° gear wheel - intermediate wheel 43 3 ° gear wheel - driven wheel 430 axial bore output wheel 431 inner splines output wheel 471, 472 spacers 473 shaft 2 ° toothed wheel - making spacer 48, 49 holding plates 5 geared motor 51 geared motor housing
    权利要求:
    Claims (14)
    [0001]
    REVENDICATIONS1. Linear actuator (2) for the drum brake (1) of a vehicle, in particular an automobile, characterized in that it comprises: - a linear actuating assembly (3) including a screw-nut system formed by a rotary screw element (31 ) and a second linearly actuated threaded element (32) arranged to actuate said drum brake by moving the first ends (122, 132) of the braking segments (12, 13) in a direction away from each other. actuating means (D2), under the effect of a rotational drive of said rotatable threaded element vis-à-vis said second threaded element; a rotary motor (5); - A transmission subassembly (4) driven by said motor (5) and rotating said rotary threaded element (31) by a slide connection in said direction of operation (D2).
    [0002]
    2. linear actuator according to the preceding claim, characterized in that the linear actuating assembly (3) is enclosed in a housing (21) in which it is movable in translation, in the actuating direction (D2), between two extreme positions in each of which it abuts by bearing a shoulder (329, 339) carried by said linear actuating assembly against a surface carried by said housing.
    [0003]
    Linear actuator according to one of the preceding claims, characterized in that the transmission subassembly (4) comprises toothed wheels (41, 42, 43) interengaged with each other and mounted to receive the rotary motion of the actuator. by a driving wheel (41) and for driving the rotary threaded member by a driven wheel (43) carrying an axial bore (430) which surrounds the rotatable threaded element (31), said bearing bore, on the inner surface of said an output wheel, an inner drive shape (431) which cooperates with an outer drive form (312) carried by the outer surface of said rotatable threaded member to rotate the same while permitting sliding together therebetween in translation in the direction of actuation (D2).
    [0004]
    4. linear actuator according to the preceding claim, characterized in that the drive forms (312, 431) of the rotary threaded element (31) and / or the bore of the driven wheel (43) comprise splines.
    [0005]
    Linear actuator according to Claim 3 or 4, characterized in that the drive shapes (312, 431) of the rotary threaded element (31) and / or the bore of the driven wheel (43), and preferably both have a cross section to the direction of actuation (D2) whose profile thins radially, in particular trapezoidal manner so as to exert on the rotatable threaded element (31) a centering force in the bore (430) during transmission of torque.
    [0006]
    Linear actuator according to one of the preceding claims, characterized in that the rotatable threaded element (31) forms the nut of the screw-nut system.
    [0007]
    7. Linear actuator according to any one of the preceding claims, characterized in that the transmission subassembly (4) comprises a plurality of wheels whose axes are parallel to each other and to the actuating direction (D2), and in that said wheels meshing with each other by teeth with external contacts.
    [0008]
    8. linear actuator according to any one of the preceding claims, characterized in that the transmission subassembly (4) forms a pre-assembled element within a carcass comprising two parallel plates (48, 49) between which are the toothed wheels (41, 42, 43) are held and have circular holes accommodating shafts (419, 473, 439) protruding from said gears to form bearings holding them radially in position.
    [0009]
    9. Linear actuator according to any one of the preceding claims, characterized in that it comprises: - a first housing (21), said main housing, receiving the screw-nut system in an actuating housing (217 ), which intersects a housing (22) receiving a driven driven wheel (43) at the output of the transmission subassembly (4) and driving the rotatable threaded element (31); and a second housing (23), called secondary housing, which is assembled with said main housing so as to enclose said transmission subassembly.
    [0010]
    Linear actuator according to one of the preceding claims, characterized in that the linear actuating assembly (3) comprises in series with the screw-nut system a resiliently deformable element (33), at least in the direction of actuation (D2), under the effect of a spreading force applied to the segments (12, 13) by the screw-nut system.
    [0011]
    11. Drum brake (1) comprising two segments (12, 13) mounted on a plate (10) so as to be able to deviate from one another to bear on a friction track carried by the interior of a drum movable in rotation relative to said plate, characterized in that it comprises a linear actuator (2) according to any preceding claim arranged to separate from one another two first ends (122, 132) of said segments which are vis-à-vis one another.
    [0012]
    12. Brake according to the preceding claim, characterized in that the two segments (12,
    [0013]
    13) are articulated to a rod (14) movable relative to the plate and which connects them in the vicinity of their second ends (121, 131), opposite the first ends, said link being able to transmit one (12). ) of said segments to the other (13) of said segments a force which pushes said other segment (13) in abutment against an anchoring element (21) fixed relative to the plate (10). 13. Brake according to claim 11 or 12, characterized in that it further comprises a second actuator providing a second braking function, in particular of service (11), said second actuator being arranged to separate one of the other the second ends (121, 131) of the two segments (12, 13) while the first ends (122, 132) abut in relation to the plate (10).
    [0014]
    14. Braking device for a vehicle or a subassembly of a vehicle, in particular a road, comprising a brake disk interacting with brake pads to perform a second braking function, in particular a service brake, characterized in that it comprises a brake according to claim 11 or 12, arranged to provide a first braking function, including parking brake and / or emergency, and in that its drum is integral with, and coaxial with, said brake disc.
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    FR3096634A1|2020-12-04|Drum brake actuator gear motor, including a reduction rate of 30 A 210
    EP3902727A1|2021-11-03|Reduction motor for drum brake
    同族专利:
    公开号 | 公开日
    WO2015101611A4|2016-02-04|
    CN106164525A|2016-11-23|
    EP3089899A2|2016-11-09|
    WO2015101611A3|2015-11-26|
    EP3089899B1|2020-12-02|
    FR3016011B1|2017-06-09|
    JP6557239B2|2019-08-07|
    CN106164525B|2019-03-26|
    JP2017502230A|2017-01-19|
    WO2015101611A2|2015-07-09|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    FR2697599A1|1992-10-30|1994-05-06|Bendix Europ Services Tech|Drum brake with mechanical actuation.|
    US8011482B2|2005-10-31|2011-09-06|Kelsey-Hayes Company|Electric actuator unit for a vehicle brake assembly|
    US20130087422A1|2011-10-07|2013-04-11|Mando Corporation|Electronic parking brake|WO2020136325A1|2018-12-28|2020-07-02|Foundation Brakes France|Reduction motor for drum brake|EP0416760B1|1989-08-29|1994-06-01|Kelsey-Hayes Company|Brake assembly|
    NL1013783C2|1999-12-07|2001-06-08|Skf Eng & Res Centre Bv|Drum brake and electric actuator therefor.|
    DE102004049434A1|2004-01-21|2005-10-06|Continental Teves Ag & Co. Ohg|Electromechanically actuated parking brake|
    AT508022T|2007-10-04|2011-05-15|Toyota Motor Co Ltd|PARK BRAKE SYSTEM|KR102128229B1|2018-08-17|2020-06-30|현대모비스 주식회사|Drum break apparatus|
    FR3091323B1|2018-12-27|2020-12-11|Foundation Brakes France|ACTUATOR FOR ELECTROMECHANICAL DRUM BRAKE WITH INCREASED ROBUSTNESS|
    KR20200099729A|2019-02-15|2020-08-25|현대모비스 주식회사|Parking brake apparatus|
    CN112696447B|2021-03-23|2021-06-11|河南经济贸易技师学院|Braking force adjusting device of wheel brake|
    法律状态:
    2015-11-23| PLFP| Fee payment|Year of fee payment: 3 |
    2016-11-21| PLFP| Fee payment|Year of fee payment: 4 |
    2017-11-17| CA| Change of address|Effective date: 20171013 |
    2017-11-21| PLFP| Fee payment|Year of fee payment: 5 |
    2019-11-20| PLFP| Fee payment|Year of fee payment: 7 |
    2020-11-20| PLFP| Fee payment|Year of fee payment: 8 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1363702A|FR3016011B1|2013-12-30|2013-12-30|AXIAL SLIDED SPROCKET ACTUATOR, AND DRUM BRAKE AND BRAKING DEVICE SO EQUIPPED|FR1363702A| FR3016011B1|2013-12-30|2013-12-30|AXIAL SLIDED SPROCKET ACTUATOR, AND DRUM BRAKE AND BRAKING DEVICE SO EQUIPPED|
    PCT/EP2014/079402| WO2015101611A2|2013-12-30|2014-12-30|Actuator driven by a gear having an axial guide rail, and drum brake and braking device provided with same|
    JP2016544599A| JP6557239B2|2013-12-30|2014-12-30|Actuator driven by gear having axial guide rail, and drum brake and brake device including the same|
    EP14828484.7A| EP3089899B1|2013-12-30|2014-12-30|Actuator driven by a gear having an axial guide rail, and drum brake and braking device provided with same|
    CN201480075043.4A| CN106164525B|2013-12-30|2014-12-30|By the actuator of the geared system driving with axial guidance and drum brake and brake apparatus with the actuator|
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