• 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:
    Motion converter between a motor member comprising a screw (1), locked in translation and driven in rotation having a thread (11), a nut (2) connected in translation (23) to the receiver member R having a first thread ( 21) meshing with the thread (11) of the screw and and a second thread (22). A sleeve (3) coaxially surrounds the nut (2), locked in rotation and in translation relative to the screw (1) and having a thread (31) with which meshes the second thread (22) of the nut . To the nut (2) slaved by its second thread (22) to the thread (31) of the sleeve (3), the screw 1 communicates a combined movement of rotation and translation whose translation component (Tr) along the axis XX is transmitted to the receptor organ R.
    公开号:FR3027365A1
    申请号:FR1459870
    申请日:2014-10-15
    公开日:2016-04-22
    发明作者:Raynald Sprocq；Chris Anderson
    申请人:Robert Bosch GmbH；
    IPC主号:
    专利说明:

    [0001] FIELD OF THE INVENTION The present invention relates to a screw-drive converter connecting a motor member to a receiver member to transform the rotational movement of the motor member, for example with a motor or a geared motor. a translating movement in one direction or the other applied to the receiving member. STATE OF THE ART There are multiple motion conversion devices transforming a rotational movement into a translational movement such as rod and crank mechanisms. But the known converters are generally of a relatively complex or bulky structure. OBJECT OF THE INVENTION The object of the present invention is to develop a simple screw-type motion con- verter which can be easily integrated in a very congested environment, such as for accessory or actuator equipment. of motor vehicles. DESCRIPTION AND ADVANTAGES OF THE INVENTION To this end, the subject of the invention is a screw-drive converter between a motor member and a receiver member, characterized in that it comprises a rotational axis screw, which is blocked. in translation and driven in rotation having a thread, a nut connected in translation to the receiving member having a first thread meshing with the thread of the screw and a second thread, a sleeve surrounding the nut coaxially and locked in rotation and in translation relative to the screw and having an internal thread with which meshes the second thread of the nut, the rotatably driven screw communicating with the nut servo by its second thread to the thread of the sleeve, a combined movement of rotation and translation whose translation component along the axis is transmitted to the receiving member. The motion converter according to the invention of extremely simple structure and very small footprint makes it possible to effectively transform a rotational movement into a translational movement.
    [0002] According to a particular characteristic, the second thread of the nut has a length less than half a turn. This multiplies the number of threads and second threads for the nut to absorb or transmit significant forces distributed over a number of threads, for example two threads symmetrical with respect to the axis of the converter or three rotationally symmetrical threads relative to the axis of the converter. In addition, since the second thread which cooperates with the thread of the sleeve has a reduced length limited to a thread section, this makes it possible to adapt the outer contour of the threading section to threads of variable pitch to ensure nevertheless a good support of the second thread even in the form of a section with the internal thread of the sleeve. According to another advantageous characteristic, the external thread is composed of one or more thread segments of different pitch. Specifically, in this case, it is interesting that the second thread of the nut has a length less than the length of a half-turn of the thread and that its outer shape is curved to accommodate the pitch variations of the threads. threads while having a large contact area.
    [0003] According to another advantageous characteristic, the converter, the second thread of the nut has a form of curvilinear parallelogram whose long sides with small curvature are connected by the short sides with high variable curvature, which is particularly suitable for threading variable pitch.
    [0004] According to another advantageous characteristic, the groove thread of the sleeve is at variable pitch and the second thread of the nut has an elongated shape whose length is less than the smallest width of the groove projected in a plane perpendicular to the axis. and a width at most equal to the smallest width of the groove, the long sides of the thread acting as a support in the parts of the threading of the small steps and the short sides ensuring the support of the threading in the groove is in sectors large steps in which the pitch variations are absorbed by the small curved sides of the thread. The invention also relates to a pressure generator comprising a converter, characterized in that it comprises a cylinder housing at least one piston displaced in translation by the converter nut comprising a central screw and a sleeve cooperating with the nut. by the thread pairs. The invention also applies to a pressure-sensitive module comprising a double-screw motion converter receiving the pressure prevailing in a circuit, characterized in that it consists of a module formed of a housing with a cylinder forming a chamber connected to the pressure circuit and closed by a piston screwed into a threaded cylinder of a pusher, the piston being locked in rotation but free in translation and the pusher being provided with an external thread cooperating with the internal thread of the cylinder, the pusher being pressed against a compression spring and torsion receiving the torsion energy and compression transmitted by the pusher moved by the piston under the effect of the pressure in the chamber.
    [0005] According to another advantageous characteristic, the pressure-sensitive module, characterized in that the internal thread of the cylinder receiving the external thread of the pusher comprises at least two parts, one with a straight thread parallel to the axis and the other, a low pitch thread.
    [0006] Thus the invention makes it possible to provide particularly effective devices for controlling actuators executing a translational travel or using a translational travel, particularly in an environment allowing only a very small space requirement, for example the integration of actuators into the actuators. motor vehicle equipment. Drawings The present invention will be described in more detail below with the aid of examples of double-screw motion converters shown in the accompanying drawings in which: FIG. 1 is a diagrammatic axial sectional view of a conver- double-screw motion weaving machine, FIG. 1A is a simplified side view of the screw-in motion converter of FIG. 1, FIG. 2 is the diagrammatic development in a plane of the double-screw converter of FIG. 1, FIG. is a schematic side view of a variant of a double screw motion converter of FIG. 1, FIG. 3A is a separate view of the external thread of the nut, FIGS. 3B-3C are two-stage side views. FIG. 4 is the development in a plane of the converter of FIG. 3, FIG. 5 is a schematic side view of another variant of a motion converter in FIG. FIG. 6 is an axial section of an embodiment of a twin screw motion converter thrust actuator according to the invention, with a pressure transmitter. Figure 7 is an axial section of a pressure receiver with a motion converter.
    [0007] DESCRIPTION OF EMBODIMENTS OF THE INVENTION FIG. 1 shows a double screw motion converter device 100 connecting a motor member M to a receiver member R. The motor member M provides a rotational drive movement (Ro) for move the receiver member R in translation (Tr) in the direction of the axis XX. The set has a symmetry of rotation about the axis XX. The converter 100 consists of a screw 1 of axis XX locked in translation but free in rotation; it is driven in rotation by the drive member M. The screw 1 meshes by its thread 11 with the thread 21 of a nut 2 connected in translation to the receiving member (R) by a connecting member 23 transmitting the movement of translation but not that of rotation of the nut 2. The nut 2 is surrounded by a sleeve 3, coaxial with the axis XX. It is blocked in rotation and in translation. The rotation of the screw 1 is a rotation relative to the sleeve 3 considered as fixed. But the rotation is relative and applied to the nut 2 movable relative to the screw 1 and the sleeve 3 so that in reality only the algebraic difference in the rotational speeds of the screw 1 with respect to the sleeve 3 is taken into account. can rotate with an algebraic rotation speed R1 and the screw 1 at the rotational speed RO so that the rotational speed applied to the nut 2 will be a function of the helix angle of each thread. The sleeve 3 has an internal thread 31 with which the second thread 22 of the nut 2, which is an external thread, engages. The internal thread 31 of the sleeve 3 is a groove thread delimited by two threads 31A, 31B for guiding the thread 22 of the nut 2. The latter (22) is constituted only by a thread portion extending over less than 1 turn and preferably less than half a turn of the nut 2 so as to reduce the bulk thanks to a nut 2 of significantly shorter length than that of the screw 1 representing the translational stroke maximum to move the receiver R. But, the contact surface is sufficiently large between the threads (31A, 31B) bordering the inner thread 31 and the thread 22 to transmit significant forces.
    [0008] The side view of FIG. 1A only shows the threads 31A, 31B bordering the groove thread 31 of the sleeve 3 without the body of the sleeve so as to reveal the thread 22 of the nut 2 guided on both sides between the threads 31A , 31B; the thread 22 is a section of length less than half a perimeter of the nut 2 and is highlighted by its shaded appearance in Figure 1A. FIG. 2 is a diagram developed in a plane (that of the figure) for describing the operation of the double screw motion converter 100 of FIG. 1. According to the developed representation and an orientation corresponding to that of FIG. the axis XX is the axis of the screw 1 whose thread 11 trace F corresponds to the slope of the thread in its representation developed in the plane of Figure 2. The axis XX serves to define the axial position of the current point Mi of the thread 11 of the screw 1. The axis YY passing through the origin 0 of the marker serves to locate the slope of the threads 11 and 31. The developed thread 11 moves its current point Mi with the threading 21 of the nut 2 along the XX axis. The current point Mi at the intersection with the axis XX also shows the theoretical position of the nut 2 driven by the screw 1 if the nut was locked in rotation but free in translation.
    [0009] As the second thread or external thread 22 of the nut 2 is forced to follow the fixed thread 31 of the sleeve 3, the current point Pi of this engagement moves on the development in the plane of the thread 31 of the sleeve 3 and represented by a single trace (and not the double trace of the nets 31A, 31B not to complicate the drawing). As the nut 2 has a current point Mi for its engagement with the screw 1, the current point Pi is therefore located on the mobile development Fi of the thread of the screw 1.
    [0010] The current point Pi has a projection P10 on the axis OX which represents, to a constant close, the measurement of the displacement of the receiver R with respect to the origin O. As in this example, the threads 11 and 31 have opposite directions. , the current point Pio moves slower than the current point Mi of the screw 1. By convention, the displacement is in the direction (+ X) for this rotation (+ Ro) of the screw 1. For a rotation in direction opposite (-Ro) of the screw 1, the current point Pi moves to the right (according to Figure 2) in the direction (-X) so that the displacement of the current point Pio representing the receiver R will be in advance from the current point Mi of the screw 1.
    [0011] According to the example of Figures 1, 1A, the threads 22, 31 are in opposite directions so that the rotation (Ro) of the screw 1 pushes the nut 2, the thread 21 is slaved to the internal thread 31 of the sleeve 3 qu he is thus obliged to follow. The double-threaded converter (11, 21; 22, 31) induces in the nut 2 a translational movement and a rotational movement: the screw 1 advances the nut 2 while the thread 31 in the opposite direction to that of the thread 11 rotates the nut 2 in the opposite direction corresponding to a retreat of the nut 2 so that the combined movement output, applied to the receiver R is multiplied, that is to say is lower to the advance that would produce the single screw 1. In other words, the translational movement resulting from the nut 2 is then reduced relative to the movement of the nut 2 if it was locked in rotation.
    [0012] Conversely in the case of a thread 31 in the opposite direction to that shown in Figures 1, 1A, the nut 2 advances faster than by its only cooperation with the screw 1, if it was locked in rotation. In the diagram, the distance OPi is representative of the displacement of the nut 2 on the thread 31 and the distance OP10 represents the translation of the receiver R, transmitted by the connecting member 23. Finally, the distance MiPi represents the development The thread 31 makes an angle (a) by positive convention, with respect to the axis YY so that the current point Pi moves in the first quadrant Q1 of the XOY mark. The current point Pio (Pi) is late compared to the current point Mi if the screw 1 rotates in the direction (+ Ro) indicated, whereas for a rotation in the opposite direction (Ro), the current point Pio is ahead of the current point Mi of the screw 1.
    [0013] FIG. 2 also shows, in the quadrant Q2, the case of a thread 31 'having a "negative" slope (a') with respect to the axis YY. In this case, for the same screw 1, the current point Qi is projected in Qi0 in advance on the current point Mi for the direction of rotation (+ Ro) and vice versa.
    [0014] FIG. 3 shows an embodiment of the converter 200 whose representation is limited to the screw 210, to the nut 220 and to the sleeve 230. This embodiment of the converter 200 differs from the previous one by the particular shape of the internal thread. 231 of the sleeve 230.
    [0015] Indeed, the thread 231 is a variable pitch thread consisting of a straight portion 231D parallel to the axis XX associated with a helical portion 231H for example constant pitch. The width LD of the right portion 231D is the width of the portion 231D projected in a plane perpendicular to the axis XX.
    [0016] The width LH of the helical portion 231H is the measurement of the width of the thread 231 in the direction perpendicular to the direction of the thread 231. The width LD is the largest possible length of the thread portion 222 and the width LH is the largest possible width of the thread portion 222; the thread 222 is thus in a curvilinear parallelogram (Figure 3A). Figure 3 shows the thread 222 of the nut 2 flowing in the right part 231D being supported by its or its short sides 222a against the sides 231D / A or B of the part 231D (see also Figure 3A). The junction between the straight part 231D of the thread 231 and its helical part 231H is made by a transient part 231T, very short, with a strong curvature, substantially corresponding to the passage of the thread 231 "with infinite pitch" in its right part 231D at the thread 231 "finite step" in its helical portion 231H, the transient portion 231T very schematically pass the thread portion 222 of its support in the thread 231 by its short sides 222a to a support by its long sides 222b (Figure 3A). In the case of a thread 231B with a constant pitch, the contact with the thread 222 is made over an important length of the section whereas in the case of a thread 231B with variable pitch, the contact is smaller especially to absorb variations of curvature, the long sides 222b themselves have a concave / convex curvature.
    [0017] FIG. 3B shows the thread 222 passing in the transitional part 231T at the beginning of its engagement in the helical part 231H; FIG. 3C shows the thread 222 passing in the helical part 231H while being supported by one or the other of its large sides 222b against the 231H-A or 231H-B sides of the thread 231 (see FIGS. 3, 3A for details of the references). FIG. 4 shows the development in the plane of the double-screw converter of FIG. 3, in a representation similar to that of FIG. 2, but for a thread 231 having a straight part 231D corresponding to a segment OD on the axis XX and a helical portion 231H corresponding to the DH segment. The thread 11 is represented by the straight line Fi passing through the current point Mi. The thread 222 being parallel to the thread 231 both in its right part 231D and in its helical part 231H, it is represented by the current point Pi at intersection of the current line Fi and the development of the thread 231 (segment DH). The current point of the receiver R is the projection P10 of the current point Pi on the axis XX which, in the case of the slopes of the threads 11, 231 of the example, is delayed with respect to the current point Mi for a displacement of the current threading. Fi to the left, which corresponds to a certain direction of rotation of the screw 1. For the opposite rotation, the current point Pio is in advance with respect to the current point Mi.
    [0018] As a remark, to simplify the development, the transient portion of the threading segment has not been shown in Figure 4 at the junction of segments OD and DH. Figure 5 schematically shows another example of a double-screw motion converter 300 whose representation is limited to the thread 322 of the nut 2 and the thread 331 of the sleeve not detailed. The thread 331 has a large pitch entry portion 331E, followed by a transient portion 331T joining a low pitch helical portion 331H.
    [0019] The thread 322 of the nut is limited to a segment in the form of a curvilinear parallelogram whose short sides bear one or the other against the unreferenced sides of the entry portion 331E of the thread 331 and also in the transient portion 331T while the long sides bear against the sides of the portion 331H of the thread 331. The development in the plane of the double screw converter 300 corresponds to a development like that of Figure 4 except that the segment representing the input portion 331E is not aligned on the axis XX but inclined at a small angle with respect to this axis which corresponds to a very large pitch helix, to be followed by a more strongly inclined segment corresponding to the transition 331T and then a segment of inclination comparable to that of the segment DH of FIG. 4 since according to this example, the helical part 331H has a pitch identical to or similar to that of the part 231H of the embodiment of FIG. Figures 3, 4. The helix angles of the thread 331 are indicated by A and B. In the case of the converter 300, the translational component is initially strong for the part 331E, while being less strong than for 231D part of the embodiment of Figure 3, then evolve as for the 231H part of the embodiment of this same Figure 3. Figure 6 shows the integration of a double screw motion converter 100 in a generator pressure 400 shown very schematically by a cylinder 410 housing a piston 420 moved in translation by the nut 2 of the converter 100 comprising a central screw 1 and a sleeve 3 cooperating with the nut 2 by the thread pairs like this has been described above. For this example, the sleeve 3 has a two-part recessed thread 31 whose first straight portion or inlet portion rapidly advances the nut 2 and therefore the piston 420, and the second portion, helical, produces a further advance. slow piston 420 still for the same speed of rotation of the motor M. This allows in particular to generate greater pressure than in known systems or more generally to optimize the combinations of parameters: power or torque-motor hydraulic pressure in the chamber pressure rise time.
    [0020] FIG. 7 shows a module 500 sensitive to the pressure prevailing in a circuit 600, for example a brake circuit. The module 500 consists of a housing 501 with a cylinder 510 forming a chamber 503 connected to the pressure circuit 600. The chamber 503 is closed by a piston 520 guided in the bore 504 of the housing 501. The piston 520 has an internal thread 521 in which is screwed the threaded cylinder 531 of a pusher 530 also guided in the bore 504. The piston 520 has at least one outer leg 522 running in a longitudinal groove 511 of the cylinder 510 and thus being locked in rotation but free in translation along the axis XX of the bore 504. The piston 520 is provided with not shown seals sealing the chamber 503.
    [0021] The pusher 530 is provided with an external thread 532 received in the internal thread 512 of the cylinder 510. The internal thread 512 is for example several parts and in particular two parts, one 512A with a straight thread parallel to the axis XX or a thread with a very large pitch and the other 512B is a thread with a low pitch similar to that of a common thread. The pusher 530 is pressed against a compression spring 540 pressing against the bottom 502 of the housing 501 and its other end 542 against the pusher 530. Thus, when the piston 520 is pushed by the pressure in the 503 chamber, it pushes the pusher 530 obliged to follow by its external thread 532, the movement imposed by the thread 512 of the cylinder 510 and at the same time the movement imposed by the thread 521 of the piston 520 to the external thread 532 so that the spring 540 undergoes a compression movement, up to the point of equilibrium with the pressure in the circuit 600. The choice of the characteristics of the spring 540 and the two pairs of threads 521, 531 and 532, 512 makes it possible to define the pressure prevailing in the circuit 600 for a displaced liquid volume, given according to parts 512A, 512B.
    [0022] Thus in summary, the force exerted by the screw-piston 520 pushes the pusher 530 in translation and in rotation following the thread 512 of the cylinder 510. This movement of the pusher 530 is transmitted to the spring 540 which accumulates this compression energy to restore it to the screw-piston 520 or maintain the equilibrium pressure in the circuit 600 according to the characteristics of the spring 540. In the above examples, (and without multiplying the numerical references corresponding to each example), it is advantageous to multiply the threads 31 of the sleeve 3 by parallel traces and to have as many threads 22 on the nut 2. In particular, it is advantageous to balance the twin-screw converter by distributing the forces to transmit by the nut to the receiver as regularly as possible over the entire periphery of the nut. These remarks apply to the various embodiments described above. Thus, and by way of example in Figures 1, 1A, 3, 5, it is noted that the threads of the sleeve are tripled and the outer threads of the nut are too. The second and third outer threads of the nut are constituted as the first by a section in the form of a curvilinear parallelogram less than a third-round thread. The third external thread is behind the nut in the various drawings. However, the groove pattern shows that there are three parallel grooves.15 NOMENCLATURE OF MAIN ELEMENTS 1 Screws 11 Thread 2 Nut 21 Inner Thread / First Thread 22 Thread Outer / Second Thread 3 Sleeve 31, 31 'Inner Thread 31A Thread 31B Net 100 Double Screw Motion Converter 200 Double Screw Motion Converter 210 Screw 220 Nut 222 Thread Section 222a Small Side 222b Large Side 230 Sleeve 231 Thread 231D-A Thread Side 231D 231D-B Thread Side 231D 231D Part right 231H Helical part 231H-A Thread side 231H 231H-B Thread side 231H 231T Transient part 400 Pressure generator 410 Cylinder 420 Piston 500 Pressure-sensitive module 501 Enclosure 502 Enclosure bottom 503 Chamber 504 Bore 510 Cylinder 511 Longitudinal groove 512 Internal thread 512A Threaded part 512B Threaded part 520 Piston 521 Internal thread 522 Tab 530 Plunger 531 Cylinder fi 532 External thread 540 Compression and torsion spring 541 First end of the spring 542 Second end of the spring 600 Pressure circuit Mi Current point of the screw Pi Current point of the nut Pio Current point of the LD receiver Width of the right side 231D LH Width of helical part 231H25
    权利要求:
    Claims (8)
    [0001]
    CLAIMS 1 °) Screw motion converter between a motor member M and a receiver member R, characterized in that it comprises - a rotational axis screw XX, locked in translation and driven in rotation, having a thread (11), a nut (2) connected in translation (23) to the receiving member R and having a first thread (21) meshing with the thread (11) of the screw and a second thread (22), - a sleeve (3) co-axially surrounding the nut (2) and locked in rotation and translation with respect to the screw (1) and having a thread (31) with which the second thread (22) of the nut (2) engages . the screw 1 rotated communicating with the nut (2) controlled by its second thread (22) to the thread (31) of the sleeve (3), a combined movement of rotation and translation whose translation component (Tr ) along the axis XX is transmitted to the receiving organ R.
    [0002]
    2) Converter according to claim 1, characterized in that the first thread (21) of the nut (2) is an internal thread and the screw (1) has a corresponding external thread (11).
    [0003]
    3 °) Converter according to claim 1, characterized in that the second thread (22) of the nut (2) has a length less than a half turn.
    [0004]
    4 °) Converter according to claim 1, characterized in that the thread (31) of the sleeve 3, is composed of one or more thread segments of different pitch.
    [0005]
    5 °) Converter according to claim 3, characterized in that the second thread (22) of the nut 2 has a form of curvilinear parallelogram whose long sides (222b) low curvature are connected by the short sides (222a) to strong variable curvature.
    [0006]
    6 °) pressure generator comprising a converter according to any one of claims 1 to 5, characterized in that it comprises a cylinder (410) housing at least one piston (420) displaced in translation by the nut (2) the converter (100) comprising a central screw (1) and a sleeve (3) cooperating with the nut (2) by the pairs of threads.
    [0007]
    Pressure sensitive module comprising a motion converter according to any one of claims 1 to 5, receiving the pressure in a circuit (600), characterized in that it consists of a housing (501) with a cylinder (510) forming a chamber (503) connected to a pressure circuit (600) and closed by a piston (520) screwed onto a threaded cylinder (531) and a pusher (530), the piston (520) being locked in rotation but free in translation and the pusher (530) being provided with an external thread (532) cooperating with the internal thread (512) of the cylinder (510), the pusher (530) being pressed against a compression spring (540) receiving the compression energy transmitted by the pusher (530) moved by the piston (520) under the effect of the pressure in the chamber (503).
    [0008]
    Pressure sensitive module according to claim 7, characterized in that the internal thread (512) of the cylinder (510) receiving the external thread (532) of the pusher (530) comprises at least two parts one (512A). ) with a straight thread parallel to the axis and the other (512B) with a low pitch thread.
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    同族专利:
    公开号 | 公开日
    CN105605171A|2016-05-25|
    US20160108911A1|2016-04-21|
    FR3027365B1|2018-06-29|
    DE102015217716A1|2016-04-21|
    JP2016080174A|2016-05-16|
    CN105605171B|2019-08-06|
    JP6666681B2|2020-03-18|
    US10180136B2|2019-01-15|
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    法律状态:
    2015-10-26| PLFP| Fee payment|Year of fee payment: 2 |
    2016-04-22| PLSC| Publication of the preliminary search report|Effective date: 20160422 |
    2016-10-25| PLFP| Fee payment|Year of fee payment: 3 |
    2017-10-23| PLFP| Fee payment|Year of fee payment: 4 |
    2018-10-22| PLFP| Fee payment|Year of fee payment: 5 |
    2019-10-22| PLFP| Fee payment|Year of fee payment: 6 |
    2020-10-20| PLFP| Fee payment|Year of fee payment: 7 |
    2021-10-18| PLFP| Fee payment|Year of fee payment: 8 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1459870|2014-10-15|
    FR1459870A|FR3027365B1|2014-10-15|2014-10-15|MOVEMENT CONVERTER WITH DOUBLE SCREW|FR1459870A| FR3027365B1|2014-10-15|2014-10-15|MOVEMENT CONVERTER WITH DOUBLE SCREW|
    DE102015217716.5A| DE102015217716A1|2014-10-15|2015-09-16|Twin-screw motion converter|
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