• 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 a spring device (1) with controlled stiffness for a motor vehicle. The device (1) comprises a support (12) of a spring (11) comprising a magnetic body, of the electromagnet type, and a magnetic plate for actuating a means for clamping the support along a guide rod ( 13). The magnetic body can be driven to generate a magnetic force actuating the clamping means. The assembly can thus lock the spring (11) and adapt the stiffness of the device (1) according to rolling information
    公开号:FR3017337A1
    申请号:FR1451133
    申请日:2014-02-13
    公开日:2015-08-14
    发明作者:Jean Marc Allegre；Christophe Monteil
    申请人:Peugeot Citroen Automobiles SA；
    IPC主号:
    专利说明:

    [0001] The field of the invention relates to a spring device with variable stiffness for a motor vehicle suspension, in particular comprising two springs of distinct stiffness. The suspension carries the load of the motor vehicle and also ensures the vertical comfort of the vehicle by filtering the inequalities of the road. Conventional mechanical suspensions comprise a device with a spring whose end turns are secured to supports. These suspensions have a linear stiffness and the adjustment is adapted to obtain a compromise of comfort with respect to the holding of the body. The suspension of a sports car is configured to promote handling at the expense of comfort, while a family vehicle sees the comfort of the cashier. There are vehicle suspensions using variable damping where the damping is controlled according to the information collected by sensors to adapt to different life situations. These suspensions are often associated with a linear metal spring device, which in fact limits the potential of the compromise between comfort and bodywork. Hydropneumatic suspensions are also known which make it possible to modify both the stiffness and the damping. This solution has the disadvantage of being difficult to implant on a vehicle in comparison with a conventional mechanical solution. Its cost is also higher. The patent document FR2677929B1 describes, in FIG. 8, a damper with two springs whose respective stiffness of each spring is different. This device makes it possible to modify the equivalent stiffness of the damper by eliminating the action of the spring R30 having the lowest stiffness. The elimination is operative when the compression of the spring R30 is such that the support 32 of the spring R30 is constrained by a stop 33. The compression of this spring then stops, only the upper stiffness spring R20 supporting the increase of the charge. However, this system has the disadvantage that it is impossible to control the variation of the equivalent stiffness of the spring device. Indeed, it is predetermined by the crushing stroke imposed by the position of the stop 33 on the guide rod disposed within the springs. An object of the invention is to provide a spring device whose stiffness can be controlled manually or automatically to accommodate a larger number of life situations. More specifically, the invention relates to a spring device with controlled stiffness for a motor vehicle suspension comprising a spring, a first support secured to a first end turn of the spring, a second support secured to a second end turn. of the spring, at least one guide rod for coupling the first and second supports and allowing displacement of the second support during deformation of the spring.
    [0002] According to the invention, the second support comprises a body forming an electromagnet, a ferromagnetic plate facing the body and movable relative to the body and a clamping means of the rod, the body, the plate and the clamping means being arranged so that the body is able to exert a magnetic force on the plate to actuate the clamping means to prevent movement of the second support along the rod. Alternatively, the rod is secured to the first and second supports outside the circumference of the spring, the second support having a guide cylinder traversed by the rod. According to a variant, the clamping means is an annular washer to the rod, deformable and positioned so that the plate and the body are able to deform the washer by a pressure resulting from the magnetic force to operate the clamping force on the stem. According to a variant, the second support further comprises a means for spacing the plate and the body to allow the second support to move. Advantageously, the clamping means is integral with the body of the second support. According to a variant, the device also comprises a second spring concentric with the first spring, the second spring being secured to the first support by a first end turn and to a third support by a second end turn, the rod being coupled only. the first and second supports among the three supports. According to a variant, the device comprises at least two guide rods for securing the first and second supports, each of the rods comprising a clamping means.
    [0003] The invention relates to a motor vehicle comprising any one of the variants of the spring device. According to the invention there is also provided a method of controlling the stiffness of the spring device according to any one of the preceding variants. The method comprises the following successive steps: - request for a change in the stiffness of the spring device, - then control of an electric current in the electromagnet of the second support to lock the spring. Thanks to the invention, the equivalent stiffness is controlled at will by a predetermined and flexible strategy, dependent on information collected by sensors or on command of the driver. In addition, the equivalent stiffness is not dependent on a compression level of the spring. A greater number of rolling situations is thus covered by a suitable stiffness. Other features and advantages of the present invention will appear more clearly on reading the following detailed description of embodiments of the invention given as non-limiting examples and illustrated by the appended drawings, in which: Figure 1 shows an embodiment of a two-spring device with equivalent stiffness controlled according to the invention. Figure 2A shows a detailed view of the lower support of the spring having means for blocking its action. The view represents the moment of activation of the magnetic field preceding the spring lock. Figure 2B shows the same view of the lower support as Figure 2A. It represents a life situation when the clamping force is operative to lock the spring. The spring device 1 as described in the embodiment of FIG. 1 comprises two springs, a lower spring 11 and an upper spring 15. Each of the springs is secured at its ends by a support. The lower spring 11 is secured by its lower turn to the lower support 12 and by its upper turn to the upper support 10. The upper support 10 is an intermediate piece making the connection between the lower spring 15 11 and the upper spring 15. The upper spring 15 is secured by its lower turn to the support 10 and its upper turn to the upper support 16. The upper support 16 is in the form of a disc covering the circumference of the spring 15. This disc may have a central opening then forming a cylinder, the spring 15 then resting on the edge of the cylinder. The lower support 12 may be in the form of a disc or in this embodiment is in the form of a cylinder, the spring 11 resting on the edge of the cylinder. The support 12 is composed of a cylindrical body coupled on its outer face with a plate of the form of a disk open at its center. The plate and the body are connected by a holding pin 124 of the plate. The support 12 will be described in more detail in the following description to present the locking means of the spring 11. In addition, according to the invention, the guide rods 13 are secured on the one hand to the support 10 and to secondly to the lower support 12. One end of a rod 13 is fixedly mounted on the support 10 by a link 18, while the other end is mounted by a movable link 17 to the support 12 by means of a guide cylinder lower support 12. A rod 13 crosses and slides inside the support guide cylinder 12 when it, free, allows to obtain the most flexible stiffness. In this embodiment, the spring device 1 comprises three rods 13 distributed over the periphery of the spring device 1 and coupled by pairs of links 18 and 17 each. The guide cylinders of the connection 17 are preferably distributed around the periphery of the lower support 12, the rods then being positioned outside the periphery of the spring 11. Similarly, the fixed links of the rods 13 on the support 10 are distributed over the periphery of the cylinder 10. In this variant, the guide rods cover the length of the spring 11 only, and are therefore delimited in length by the support 10 and the support 12. These are used only for locking the spring 11. In a another variant, not described in this example, comprising two springs that can be locked, the guide rods can cover the length of the two springs and be integral with three supports. The links 18 and 17 are distributed so as to position their barycentre on the central axis of the spring 11, the three links of the sets 18 and 17 form an isosceles triangle on the surface of the body of the support 10 and support 12 respectively. Of course, other configurations can be provided, in number of rods and positioning to guide and lock the spring 11. The guide rods 13 and movable link 17 allow the movement of the support 12 along the axis of the rods. The spring 11 is operative and can be compressed when a force is exerted on the support 12. The springs 11 and 15 are concentric. The spring 15 is defined by a lower circumference of the spring 11, thus allowing its positioning partly inside the spring 11. Suitable supports, in the form of annular folds and curved inside the cylinder of the support 10 allow the supporting the upper coil of the spring 11 around the lower coil of the spring 15. This overlapping configuration of the springs 11 and 15 reduces the length of the spring device. In a variant, the springs 11 and 15 may be concentric and of the same circumference. The spring device 1 then has springs positioned one above the other without overlapping. The intermediate piece 10 then has a shape adapted to this configuration. In this configuration, the spring 11 has a stiffness lower than the stiffness of the spring 15. When the spring 11 is free, the suspension debates, the two springs 20 are operative and the support 12 slides around the rods 13. The equivalent stiffness of the device springs is equivalent to a system of two springs in series. FIG. 2A depicts a partial section of the lower support 12 as well as the guide rod 13. The life situation corresponds to the moment of control of variation of the equivalent stiffness of the spring device 1. The two springs 11 and 15 are operants and a spring inhibition control 11 is controlled. For this, the support 12 comprises a body 121 formed of a ferromagnetic material, a plate 122 covering the body 121, an electric coil 123 and a clamping means 126 of the rod 13. The plate 122 is also formed of a ferromagnetic material. This is maintained positioned at a distance of a few millimeters from the body 121 to promote the channeling of a magnetic force between the plate 122 and the body 121. This distance is also called gap. The body 121 comprising a coil 123 embedded inside the body forms an electromagnet. When an electric current passes through the coil 123 inside the magnetic body 121, a magnetic field 129 is generated and channeled into the gap creating magnetic forces 128 operating a rapprochement of the plate 122 to the body 121. Plus l ' air gap is low, and the greater the magnetic stress is important. The gap is therefore chosen to be preferably about 1mm. A holding pin 124 is also provided to hold the plate 122 facing the body 121. The pin 125 passes through the plate 122 through an opening open on the lower outer face and opening through the inner face to an orifice in the body 121. The holding pin 124 is connected to the body 121 by contact in the orifice of the body 121. In addition, a return spring 125 makes it possible to exert a restoring force to hold the plate 122 at a distance from the body 121. This distance corresponds to the gap between the body 121 and the plate 122. The return spring 125 also facilitates the detachment of the plate 122 of the plate 121 when the magnetic field 129 is inhibited, releasing the constraint of the washer on the rod 13 On the other hand, the guide rod 13 passes through the body 121 and the plate 122 by a cylinder 127 of the mobile link 17. The cylinder 127 allows the support 12 to slide along the rod.
    [0004] In addition, a clamping means 126 of the rod is positioned between the body 121 and the plate 122 so that it can be crushed by the body 121 and the plate 122. This is a Belleville type washer whose diameter The interior decreases when it is crushed. The washer is annular around the rod 13. In addition, it is dimensioned so that the diameter of the rod is adjusted to the inner diameter of the washer. Thus, when the plate 122 moves to stick to the body 121 by magnetic force, the washer is crushed and squeezes the rod 13. The washers 126 are distributed along the circumference of the support 12 to exert a plurality of clamping points 13. This makes it possible to improve the distribution of the clamping force and to reduce the clamping forces of each of the points, with regard to a solution with a single locking point as described in the state of the invention. technical. The magnetic force 128 is adapted to this distribution of the clamping points on the support 12 to prevent its movement in the majority of rolling situations. In addition, the clamping means being secured to the support 12, it can be blocked at any time during a rolling situation, unlike the solution of the state of the art which blocks the spring only when The crushing exceeds a crush predefined by the position of the stop. FIG. 2B shows the clamping life situation of the rod 13 by the washer 126 of the support 12, causing the spring 11 to be inhibited. In this configuration, the magnetic field 129 causes the washer 126 to collapse by bonding. of the plate 122 on the body 121. Accordingly, the washer exerts an annular clamping force on the rod 13, so the support 12 remains stationary relative to the support 10. The clamping force is exerted at three points of the circumference of 12. The spring 11 then no longer exerts its function of flexibility. The support 10, the support 12 and the rods 13 form a rigid assembly inhibiting the function of the spring 11. Only the spring 15 is operative. The latter having a stiffness greater than that of the spring 11, the equivalent stiffness of the spring device 1 is greater in this configuration.
    [0005] Furthermore, the spring device 1 can be controlled by an equivalent stiffness control device. The control device comprises means for recording rolling information, for example trajectory sensors, sensors for measuring suspension travel, vertical acceleration sensors for the wheels or the body, steering angle sensor, or information drivers initiated by the driver, for example a request to change the equivalent stiffness. On the basis of said running and driving information, the control device prepares a request to control the electromagnet of the support 12 of the spring device 1. A first request orders the locking of the spring 11 and a second request orders the release of the spring 11. The first request controls the generation of an electric current in the coil 123 of the support 12. The electromagnet then generates the magnetic field 129 for operating the clamping force. The second request commands the stop of the electric current in the coil 123, ending the clamping force.
    [0006] The spring device 1 with controlled stiffness makes it possible, on request, to adapt the equivalent stiffness and to effectively address the stiffness equivalent to the rolling situations.
    [0007] The compromise of comfort and cash handling adapts well to the various situations of life of the vehicle. The invention is particularly suitable for motor vehicles having electromechanical means for controlling an electric current sufficient to control an electromagnet. The control device makes it possible to improve the comfort and ride ratio of a motor vehicle during driving and responsiveness in response to a stiffness variation control.
    权利要求:
    Claims (9)
    [0001]
    REVENDICATIONS1. Spring device (1) with controlled stiffness for a motor vehicle suspension comprising a spring (11), a first support (10) integral with a first end turn of the spring (11), a second support (12) secured to a second end turn of the spring (11), at least one guide rod (13) for coupling the first and second supports (10; 12) and allowing displacement of the second support (12) during deformation of the spring (11), characterized in that the second support (12) comprises a body (121) forming an electromagnet, a ferromagnetic plate (122) facing the body (121) and movable relative to the body (121) and a clamping means (126) of the rod (13), the body (121), the plate (122) and the clamping means (126) being arranged so that the body (121) is able to exert a magnetic force ( 128) on the plate (122) to actuate the clamping means (126) to prevent movement of the second support (1 2) along the rod (13).
    [0002]
    2. Device according to claim 1, characterized in that the rod (13) is integral with the first and second supports (10; 12) outside the circumference of the spring (11), the second support (12) having a guide cylinder (127) traversed by the rod (13).
    [0003]
    3. Device according to any one of the preceding claims, characterized in that the clamping means (126) is an annular washer to the rod (13), deformable and positioned so that the plate (122) and the body (121) ) are able to deform the washer by a pressure resulting from the magnetic force (128) to operate the clamping force on the rod (13).
    [0004]
    4. Device according to any one of the preceding claims, characterized in that the second support (12) further comprises a spacing means (125) of the plate (122) and the body (121) to allow the movement of the second support (12).
    [0005]
    5. Device according to any one of the preceding claims, characterized in that the clamping means (126) 10 is integral with the body (121) of the second support (12).
    [0006]
    6. Device according to any one of the preceding claims, characterized in that it also comprises a second spring (15) concentric with the first spring (11), the second spring being secured to the first support (10) by a first turn end and a third support (16) by a second end turn, the rod (13) being coupled only to the first and second supports (10; 12) among the three supports (10; 12; 16).
    [0007]
    7. Device according to any one of the preceding claims, characterized in that it comprises at least two guide rods (13) for securing the first and second supports (10; 12), each of the rods (13) comprising a clamping means (126).
    [0008]
    8. Motor vehicle characterized in that it comprises a device according to any one of the preceding claims.
    [0009]
    9. A method of controlling the stiffness of a spring device according to any one of claims 1 to 7, characterized in that it comprises the following successive steps: - request for a change in the stiffness of the device to springs (1), - then controlling an electric current in the electromagnet of the second support (12) to lock the spring (11).
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    同族专利:
    公开号 | 公开日
    EP3105071A1|2016-12-21|
    WO2015121556A1|2015-08-20|
    FR3017337B1|2016-02-19|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    FR2677929A1|1991-06-24|1992-12-24|Bianchi Mauro Sa|SUSPENSION METHOD FOR VEHICLES USING TWO RAIDERS, RESPECTIVELY DESIGNED FOR A GOOD LEVEL OF COMFORT AND A BEAUTIFUL LEVEL OF BEHAVIOR.|
    EP2009322A2|2007-06-30|2008-12-31|ZF Friedrichshafen AG|Piston cylinder device|
    US20100314842A1|2009-06-16|2010-12-16|Toyota Motor Engineering & Manufacturing North America, Inc.|Active Magneto-Rheological Spring Assemblies and Vehicle Suspension Systems Incorporating the Same|CN105216636A|2015-10-28|2016-01-06|广西大学|A kind of pantograph spring case of adjustable rigidity|
    EP3508750A1|2018-01-05|2019-07-10|United Technologies Corporation|Variable spring rate engagement mechanism|
    US11021029B2|2018-02-28|2021-06-01|Eric Harrison|Vehicle suspension assembly and method|
    FR3061249B1|2016-12-22|2020-05-22|Schneider Electric Industries Sas|DEVICE FOR GUIDING A SPRING IN A CONTROL MECHANISM AND ELECTRICAL PROTECTION APPARATUS COMPRISING SAME|
    法律状态:
    2015-02-20| PLFP| Fee payment|Year of fee payment: 2 |
    2016-01-21| PLFP| Fee payment|Year of fee payment: 3 |
    2017-01-24| PLFP| Fee payment|Year of fee payment: 4 |
    2018-01-23| PLFP| Fee payment|Year of fee payment: 5 |
    2018-06-29| CA| Change of address|Effective date: 20180312 |
    2018-06-29| CD| Change of name or company name|Owner name: PEUGEOT CITROEN AUTOMOBILES SA, FR Effective date: 20180312 |
    2020-01-22| PLFP| Fee payment|Year of fee payment: 7 |
    2021-01-20| PLFP| Fee payment|Year of fee payment: 8 |
    2022-01-19| PLFP| Fee payment|Year of fee payment: 9 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1451133A|FR3017337B1|2014-02-13|2014-02-13|SPRING DEVICE HAVING CONTROLLED STIFFNESS|FR1451133A| FR3017337B1|2014-02-13|2014-02-13|SPRING DEVICE HAVING CONTROLLED STIFFNESS|
    PCT/FR2015/050151| WO2015121556A1|2014-02-13|2015-01-22|Device comprising springs, with controlled rigidity|
    EP15704350.6A| EP3105071A1|2014-02-13|2015-01-22|Device comprising springs, with controlled rigidity|
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