WO2008124999A1 - Dispositif d'entraînement pour meuble réglable - Google Patents

Dispositif d'entraînement pour meuble réglable Download PDF

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Publication number
WO2008124999A1
WO2008124999A1 PCT/CN2008/000591 CN2008000591W WO2008124999A1 WO 2008124999 A1 WO2008124999 A1 WO 2008124999A1 CN 2008000591 W CN2008000591 W CN 2008000591W WO 2008124999 A1 WO2008124999 A1 WO 2008124999A1
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WO
WIPO (PCT)
Prior art keywords
iron core
motor
output shaft
brake pad
fixed
Prior art date
Application number
PCT/CN2008/000591
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English (en)
French (fr)
Inventor
Zhigang Zhang
Lasse Gottler
Original Assignee
Zhejiang Xinyi Control System Co., Ltd.
Huapei Machinery (Shanghai) Co., Ltd.
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Filing date
Publication date
Application filed by Zhejiang Xinyi Control System Co., Ltd., Huapei Machinery (Shanghai) Co., Ltd. filed Critical Zhejiang Xinyi Control System Co., Ltd.
Publication of WO2008124999A1 publication Critical patent/WO2008124999A1/zh

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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
    • H02K7/102—Structural association with clutches, brakes, gears, pulleys or mechanical starters with friction brakes
    • H02K7/1021—Magnetically influenced friction brakes
    • H02K7/1023—Magnetically influenced friction brakes using electromagnets
    • H02K7/1025—Magnetically influenced friction brakes using electromagnets using axial electromagnets with generally annular air gap

Definitions

  • This invention relates to a driving device, and more particularly to a driving device for an adjustable furniture having a self-locking function that prevents rotation of the motor when the motor is stopped. Background technique
  • a driving device with a reversible low-voltage DC motor drive is generally used to achieve the height of the working surface can be raised or lowered. And when the motor stops working, the drive has a self-locking function, which can prevent the motor from rotating, so that the output shaft of the motor is stagnated at a certain position, so that the bed or the furniture surface can be kept at the required height for people to use.
  • Such a driving device is disclosed in the Chinese invention application "Actuator" of the patent application No. 200380102144.8 (publication number CN1708653A).
  • the driving device comprises a reversible motor, a worm disposed on the output shaft of the motor, a worm wheel perpendicular to the worm and connected to the worm drive, a cylindrical portion disposed above the worm wheel, and a coil spring mounted outside the cylindrical portion, and A lifting rod is connected to the bottom of the worm wheel, and the cylindrical portion includes a rotating shaft and a plastic bushing sleeved outside the rotating shaft, and one end of the coil spring is fixed on the upper surface of the worm wheel.
  • the motor drives the worm to rotate, and then the worm wheel rotates, so that the lifting rod under the worm wheel is directly controlled to rise, and at this time, the coil spring is in an expanded state to release the clamping force to the plastic bushing, the coil spring Rotating itself along the cylindrical portion; when the motor stops working, the surface of the furniture or the bed load of the bed will have a downward pressing force on the lifting rod, which in turn forces the worm wheel and the coil spring to rotate with it, at this time, the coil spring is slow Slowly tighten and hold the plastic bushing until the coil spring grips the plastic bushing and does not move, thus preventing the worm gear and the lifting rod from continuing to move, keeping the furniture surface or the bed surface at the required height
  • the motor rotates in the reverse direction, even if the lifting rod is lowered, the motor will rotate according to the braking force between the coil spring and the plastic bushing.
  • the frictional force and the clamping force between the coil spring and the plastic bushing are braking forces against the lowering of the lifting rod, and the self-locking mode is longitudinally loaded on the lifting rod.
  • the gravity is still carried by the coil spring and the plastic bushing disposed on the same axis as the lifting rod, and the braking force is equivalent to the gravity of the load, so the coil spring and the plastic bushing are more laborious, in practical application process.
  • the technical problem to be solved by the present invention is to overcome the defects of the prior art, and provide a driving device for an adjustable furniture adopting a new self-locking method, which has a flexible and effective self-locking mode, and generates noise during operation and wear of components.
  • the components are simple in construction, easy to process and assemble, and have a long service life.
  • the adjustable furniture driving device comprises a reversible electric motor, the electric motor has a first output shaft and is connected with the reduction transmission mechanism, wherein - The motor is also provided with an outsing second output shaft that rotates in synchronization with the first output shaft on the other side opposite to the first output shaft, and is disposed in order from the front to the rear at the end of the second output shaft
  • the following components are: a brake pad, fixed on the second output shaft;
  • a moving iron core can be moved in the axial direction
  • a spring having a tendency to move the moving iron core toward the brake pad and to fit the brake pad; a static iron core fixed to the motor casing, and the static iron core is embedded with an electromagnetic working synchronously with the motor The coil, the magnetic field generated by the electromagnetic coil moves the moving iron core away from the brake pad and moves toward the static iron core.
  • the reduction transmission mechanism can adopt various existing technologies to increase the transmission torque. Sometimes, the lifting mechanism on the furniture and the first output shaft of the motor are perpendicular to each other, then the reduction transmission mechanism needs to change the motor at the same time. The output direction of the output shaft, therefore, the reduction transmission mechanism can employ a pair of meshed bevel gears, or an engaged worm gear, a worm, and the like.
  • the above brake pads are made of a non-magnetic material, generally plastic is used, and the moving iron core and the static iron core are all made of a metal material.
  • the power supply of the motor is synchronized with the electromagnetic coil, that is, the power is turned on and off at the same time; when the motor is working, the lifting rod disposed under the worm wheel is raised or lowered, and the electromagnetic coil is also energized, and the electromagnetic coil in the static iron core generates electromagnetic force.
  • the moving iron core is as close as possible to the static iron core against the resistance of the spring, so that there is a gap between the moving iron core and the brake pad, that is, the moving iron core releases the frictional resistance to the brake pad. Therefore, the brake pad can rotate freely together with the second output shaft of the motor; when the motor stops working, that is, the lifting rod is at a certain height position, when the electromagnetic coil in the static iron core is powered off, the electromagnetic coil is lost.
  • the electromagnetic field of the iron core under the preload of the spring, is pressed against the brake pad on the other side, and is attached to the brake pad, and the two are pressed by the spring.
  • the moving iron core The plane friction with the brake pad, that is, the moving iron core together with the spring on one side thereof generates resistance to the rotation of the brake pad, braking the brake pad, and the second output shaft of the motor and the brake The car pieces are connected, so that the braking effect can be indirectly generated to the motor, so that the motor is self-locking.
  • the static iron core can be fixed to the motor housing in the following manner: a fixing bracket passes through the second output shaft with its central hole and is fixed relative to the motor housing, the static iron core Solid It is fixed on one side of the fixing bracket, so that the static iron core is fixed with respect to the motor casing.
  • the iron core can be correctly attached to the side surface of the brake pad, and can be realized as follows: the outer edge of the movable iron core is provided with a notch, and the notch is provided with two ends respectively between the fixed bracket and the static iron core
  • the positioning pin in this way, by the cooperation of the positioning pin and the notch, the movable iron core can only move along the positioning pin and between the brake pad and the spring. This design also makes the component assembly more complete and reliable, preventing The moving iron core is offset or even dropped.
  • the invention has the advantages that: the conductive electromagnetic coil can adsorb the moving iron core, and the movable iron core can move back and forth along the axial direction between the brake pad and the static iron core, the motor
  • the work causes the moving iron core to leave the brake pad and release the frictional resistance thereof, so that the second output shaft of the motor rotates normally with the worm on the other side, and the motor and the electromagnetic coil are powered off, and the moving iron core acts due to the spring. It must be applied to the brake pads, and the braking effect on the brake pads and the output shaft of the motor is generated by the plane friction of the two to achieve the purpose of self-locking of the motor.
  • This self-locking method is flexible and effective, and the component structure is also very simple and easy.
  • the adjustable furniture is mounted regardless of whether the motor is rotating forward or backward.
  • the core will never touch the brake pads, and will not bind the rotation of the motor output shaft, will not increase the load of the motor, and is more energy efficient;
  • the motor is stopped, the force lifting the load in the longitudinal direction of the rod, by passing through the worm wheel and perpendicular thereto:: worm second output shaft being transmitted to the motor is provided, in which case, the load
  • the force on the second output shaft of the motor has changed: small, so that the moving iron core can stop the output shaft of the motor to be reversed as long as the frictional resistance is slightly applied to the brake pad, and the self-locking is easily realized, so that the driving device has superiority. Self-locking ability.
  • FIG. 1 is a schematic structural view of an embodiment of the present invention
  • FIG. 2 is a partial cross-sectional view showing the movable iron core in a state of being away from the brake pad in the embodiment of the present invention
  • FIG. 3 is a partial cross-sectional view showing a state in which a movable iron core is attached to a brake pad according to an embodiment of the present invention
  • Figure 4 is an exploded perspective view of Figure 1. detailed description
  • the adjustable furniture driving device comprises a reversible motor 1, a worm la la disposed on the first output shaft 11 of the motor 1, and is perpendicular to the worm 11a and is connected to the worm 11a.
  • Worm gear 2 a second output shaft 12 that is extended on the other side of the motor 1 opposite to the first output shaft 11 and that rotates in synchronization with the first output shaft 11 and at the end of the second output shaft 12 a fixed bracket 4, a brake pad 5, a moving iron core 6, a spring 7, and a static iron core 8 which can be moved in the axial direction;
  • the worm wheel 2 is fixed to the motor 1 by a connecting frame 3 fixed to one side of the motor 1, and the worm wheel 2 is engaged with the worm 11a to be rotatable about an axis, and the worm wheel 2 and the worm 11a constitute a a reduction transmission mechanism that increases the output torque and changes the transmission direction, and the worm wheel 2 can directly drive the liftable legs of the hospital bed or the lifting table legs of the liftable table, or any lifting rod for lifting adjustment;
  • the central hole of the fixing bracket 4 passes through the second output shaft 12, and sequentially passes through the fixing bracket 4 and the positioning pin 93 through the bolt 91 to fix the fixing bracket 4 to one side of the casing of the motor 1;
  • the brake pad 5 is fixed on the second output shaft 12 and rotates synchronously with the second output shaft 12;
  • the outer edge of the movable iron core 6 is provided with a notch 61.
  • the notch 61 is provided with a positioning pin 62 which is respectively abutted between the fixed bracket 4 and the static iron core 8, and the movable iron core 6 can be axially Limit movement;
  • the end of the spring 7 is disposed in the central groove 81 on the side of the static iron core 8, and the other end is abutted on the side surface of the movable iron core 6, and has the movable iron core 6 moved toward the brake pad 5 and attached to the brake pad 5 Trend of convergence
  • the static iron core 8 is fixed to one side of the fixing bracket 4 by bolts 92.
  • the bolts 92 pass through the fixing bracket 4, the positioning pin 62 and the static iron core 8 respectively, and the static iron is used.
  • the core 8 is fixed to the outer casing of the motor 1 , and at the same time, the positioning pin 62 is fixed between the fixed bracket 4 and the static iron core 8 , and the static iron core 8 is embedded with an electromagnetic coil 82 working synchronously with the motor 1 .
  • the magnetic field generated when the coil 82 operates can move the movable iron core 6 away from the brake pad 5 and move toward the static iron core 8.
  • the working principle of the adjustable furniture driving device is as follows - the motor 1 works normally, and the lifting rod disposed under the worm wheel 2 rises or falls. At this time, the electromagnetic coil 82 is energized, and the electromagnetic coil 82 in the static iron core 8 generates electromagnetic force. The iron core 6 is attracted to the static iron core 8 against the resisting force of the spring 7, so that a gap is left between the movable iron core 6 and the brake pad 5, that is, the movable iron core 6 is released from the brake pad 5. Frictional resistance, so that the brake pad 5 can rotate freely with the second output shaft 12 of the motor 1, see Fig. 2;
  • the electromagnetic coil 82 in the static iron core 8 is deenergized, the electromagnetic coil 82 loses the electromagnetic field of the moving iron core 6, and the moving iron core 6 is in the spring. Under the preload force of 7, the brake pad 5 on the other side is pressed against the brake pad 5, and the two are pressed by the spring 7, at which time, the moving iron core 6 and the brake pad 5 occur.
  • the plane friction that is, the moving iron core 6 together with the spring 7 on one side thereof, generates resistance to the rotation of the brake pad 5, causing the brake pad 5 to brake, and the second output shaft 12 of the motor 1 is connected to the brake pad 5, In this way, the braking effect of the motor 1 can be indirectly made, so that the motor 1 is self-locking, see Fig. 3.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Braking Arrangements (AREA)

Description

种可调家具的驱动装
技术领域
本发明涉及一种驱动装置， 尤其涉及一种在马达停止工作状态下能防止其回转的 具有自锁功能的用于可调家具的驱动装置。 背景技术
目前， 在医院的病床和一些高度可调的家具之中， 如可升降桌、 椅子等， 普遍采 用一种带可逆转的低压直流电机驱动的驱动装置， 来实现工作面高度的可升可降， 并 且在电机停止工作时， 该驱动装置具有自锁功能， 能防止电机回转， 从而使电机的输 出轴停滞在某个位置， 这样就可使病床或者家具表面停留在所需要的高度供人们使 用。 如专利申请号为 200380102144.8(公开号为 CN1708653A)的中国发明申请 《致动 器》 ， 就公开了这么一种驱动装置。 该驱动装置包括有可逆电机、 设置在电机输出轴 上的蜗杆、 相对蜗杆垂直且与蜗杆传动相连的蜗轮、 设置在蜗轮之上的圆柱形部分和 安装在圆柱形部分之外的螺旋弹簧， 而蜗轮底部就传动连接有升降杆， 该圆柱形部分 包括转轴和套设在转轴外的塑料衬套， 而该螺旋弹簧的一端固定在蜗轮上表面。 当电 机正向转动时， 通过电机驱动蜗杆转动， 继而使蜗轮旋转， 这样直接控制蜗轮之下的 升降杆上升， 此时， 螺旋弹簧处于膨胀状态而解除对塑料衬套的夹紧力， 螺旋弹簧本 身沿着圆柱形部分旋转； 当电机停止工作， 家具表面或者病床的床面负荷会对升降杆 有向下压迫的趋势， 继而迫使与其连动的蜗轮以及螺旋弹簧旋转， 此时， 螺旋弹簧慢 慢收紧并夹持住塑料衬套， 直到螺旋弹簧紧紧夹持住塑料衬套而不能动为止， 这样就 阻止了蜗轮以及升降杆的继续活动， 使家具表面或者病床表面保持在需要的高度； 而 当电机逆向转动， 也即使升降杆下降时， 此时电机会克服螺旋弹簧与塑料衬套之间的 制动力而照旧转动。
可以看出， 在该驱动装置中， 螺旋弹簧与塑料衬套之间的摩擦力和夹紧力是用以 抵抗升降杆下降的制动力， 这种自锁方式， 其纵向的负载在升降杆上的重力仍旧是通 过设置在与升降杆处在同一轴线上的螺旋弹簧与塑料衬套来承担， 其制动力与所负载 的重力相当， 因而螺旋弹簧和塑料衬套吃力较高， 在实际应用过程中， 极易造成塑料 衬套的破碎或者螺旋弹簧的断裂， 使驱动装置丧失自锁功能； 螺旋弹簧与塑料衬套两 者经常受力， 磨损较为严重， 尤其是塑料衬套， 因而使用寿命也较短； 为弥补以上两 个缺陷， 在实际的制造过程中， 往往对弹簧的柔韧度、 塑料衬套的硬度都有较高的要 求， 这就会提高生产成本； 同时， 电机逆向转动而使升降杆下降时， 电机需要克服螺 旋弹簧对于塑料衬套的摩擦力才能继续转动， 这样无疑会加重电机的负荷力， 而且更 重要的是， 螺旋弹簧会不断的摩擦塑料衬套， 长久的摩擦必然会导致塑料衬套的磨 损， 还会产生噪音， 这种摩擦带来的工作噪音和部件磨损， 是一个影响实际使用的不 可忽视的问题。 发明内容
本发明所要解决的技术问题是克服现有技术的缺陷， 提供一种采用全新自锁方式 的可调家具的驱动装置， 其自锁方式灵活、 有效， 工作时产生的噪音以及部件的磨损 较小， 部件构造简单， 易于加工装配， 且使用寿命较长。
本发明解决上述技术问题所采用的技术方案为： 该可调家具的驱动装置， 包括有 可逆转的电机， 该电机具有第一输出轴， 并与减速传动机构传动相连， 其特征在于- 所述的电机在与所述第一输出轴相反方向的另一侧也设置有外伸的、 与第一输出轴同 步转动的第二输出轴， 并且在该第二输出轴末端处自前向后依次设置有下列部件： 一刹车片， 固定在该第二输出轴之上；
一动铁芯， 可沿轴向作限位移动；
一弹簧， 具有使所述的动铁芯向刹车片方向移动并与刹车片贴合的趋势； 一静铁芯， 其相对电机外壳固定， 该静铁芯内嵌设有与电机同步工作的电磁线 圈， 该电磁线圈所产生的磁场使动铁芯远离刹车片而向静铁芯方向移动。
所述的减速传动机构可以采用现有的各种技术， 用以加大传动扭矩， 有时， 家具 上的升降机构与电机的第一输出轴互为垂直， 那么减速传动机构就同时需要改变电机 第一输出轴的传动方向， 因此， 减速传动机构可以采用一对啮合的锥形齿轮， 或者是 啮合的蜗轮、 蜗杆等等。
上述的刹车片采用非导磁材料， 一般就采用塑料即可， 而动铁芯、 静铁芯均采用 金属材料制作。
电机的电源与电磁线圈同步工作， 即同时通电、 断电； 在电机工作时， 设置在蜗 轮下的升降杆上升或者下降， 此时电磁线圈也通电， 静铁芯内的电磁线圈产生电磁 力， 使动铁芯克服弹簧的抵制力而尽可能的与静铁芯吸附在一起， 这样， 动铁芯与刹 车片之间就留出有间隙， 也即动铁芯解除了对刹车片的摩擦阻力， 从而使刹车片能与 电机的第二输出轴一起自由旋转； 当电机停止工作， 即升降杆处于一定的高度位置， 此时静铁芯内的电磁线圈断电， 电磁线圈就丧失了对动铁芯的电磁场， 动铁芯在弹簧 的预紧力作用下， 压向位于其另一侧的刹车片， 与刹车片贴合在一起， 且两者被弹簧 压紧， 此时， 动铁芯与刹车片发生平面摩擦， 也即动铁芯连同位于其一侧的弹簧一起 对刹车片的旋转产生阻力， 使刹车片制动， 而电机的第二输出轴与刹车片相连， 这 样， 就可间接的对电机产生制动的效果， 使电机自锁。
为便于装配， 所述静铁芯相对电机外壳固定的设置方式可以采用如下方式： 一固 定支架以其中央孔穿过所述的第二输出轴， 并相对电机外壳固定， 所述的静铁芯就固 定在该固定支架的一侧， 从而使静铁芯相对电机外壳固定不动。
动铁芯与刹车片互相接触的摩擦面越大， 动铁芯对刹车片产生的制动效果就越 好， 而动铁芯要在弹簧与刹车片之间作限位的来回移动， 为确保动铁芯能正确的贴合 在刹车片的侧面上， 可以采用如下方式实现： 所述动铁芯外边沿开设有缺口， 该缺口 上穿设有两端分别抵在固定支架与静铁芯之间的定位销， 这样， 通过定位销与缺口的 配合， 使动铁芯只能沿着该定位销而在刹车片与弹簧之间作限位移动， 这种设计也使 部件装配更加完整， 牢靠， 防止动铁芯偏移、 甚至掉落。
与现有技术相比， 本发明的优点在于： 利用导电的电磁线圈会对动铁芯产生吸附 的作用， 使动铁芯在刹车片与静铁芯之间可沿轴向的来回移动， 电机工作则使动铁芯 离开刹车片而解除对其的摩擦阻力， 从而使电机的第二输出轴同另一侧的蜗杆正常转 动， 电机与电磁线圈断电， 则动铁芯因弹簧的作用而必须向刹车片贴合， 通过两者的 平面摩擦而产生对刹车片以及电机输出轴的制动效果， 达到电机自锁的目的， 这种自 锁方式灵活、 有效， 部件构造也非常简单， 易于加工装配， 而且工作时， 动铁芯与刹 车片的摩擦制动产生的噪音较小， 使用舒适， 使用寿命也较长； 该可调家具的驱动装' 置不管电机是正转还是逆转， 动铁芯始终不会接触到刹车片， 而不会对电机输出轴的 旋转产生约束力， 不会加重电机的任何负荷， 比较节能； 同时， 当升降杆到达需要的 高度后， 停止电机的工作时， 负载在升降杆上的纵向的力， 因通过蜗轮以及与其垂直： : 设置的蜗杆而传到电机的第二输出轴上， 此时， 负载到电机第二输出轴上的力已经变 : 小， 这样， 动铁芯只要对刹车片稍加摩擦阻力， 就能使电机的输出轴停止逆转， 轻易 的实现自锁， 使驱动装置具有较优越的自锁能力。 附图说明
图 1为本发明实施例的结构示意图；
图 2为本发明实施例中动铁芯远离刹车片状态下的局部剖视图；
图 3为本发明实施例中动铁芯贴合刹车片状态下的局部剖视图；
图 4为图 1的立体分解图。 具体实施方式
以下结合附图实施例对本发明作进一步详细描述。
如图 1〜图 4所示， 该可调家具的驱动装置， 包括有可逆转的电机 1、 设置在电机 1 第一输出轴 11上的蜗杆 l la、 相对蜗杆 11a垂直且与蜗杆 11a传动相连的蜗轮 2、 在电机 1 与其第一输出轴 11相反方向的另一侧设置的外伸的且与第一输出轴 11同步转动的第二 输出轴 12和在该第二输出轴 12末端处自前向后依次设置的固定支架 4、 刹车片 5、 可沿 轴向作限位移动的动铁芯 6、 弹簧 7、 静铁芯 8; 其中， 所述蜗轮 2通过与固定在电机 1一侧的连接架 3而相对电机 1固定， 且蜗轮 2与 所述蜗杆 11a啮合而可绕轴心转动， 该蜗轮 2与蜗杆 11a就构成了一个增大输出扭矩且改 变传动方向的减速传动机构， 蜗轮 2之下可以直接传动连接病床的可升降脚或者可升降 桌的升降桌腿， 也可以是任何用于升降调节的升降杆；
所述固定支架 4的中央孔穿过所述的第二输出轴 12， 并通过螺栓 91依次穿过固定支 架 4、 定位销 93而将固定支架 4固定在电机 1外壳的一侧；
所述刹车片 5固定在第二输出轴 12之上， 与第二输出轴 12同步转动；
所述动铁芯 6外边沿开设有缺口 61， 该缺口 61上穿设有两端分别抵在固定支架 4与 静铁芯 8之间的定位销 62， 而使动铁芯 6可沿轴向作限位移动；
所述弹簧 7—端设置在静铁芯 8侧面的中央凹槽 81内， 另一端抵在动铁芯 6的侧面 上， 具有使动铁芯 6向刹车片 5方向移动并与刹车片 5贴合的趋势；
所述静铁芯 8通过螺栓 92而固定在固定支架 4的一侧， 在本实施例中， 该螺栓 92分 别穿过固定支架 4、 所述的定位销 62和静铁芯 8而将静铁芯 8相对电机 1外壳固定， 也同 时将定位销 62固定在固定支架 4与静铁芯 8之间， 并且， 该静铁芯 8内嵌设有与电机 1同 步工作的电磁线圈 82， 该电磁线圈 82工作时所产生的磁场可使动铁芯 6远离刹车片 5而 向静铁芯 8方向移动。
该可调家具的驱动装置工作原理如下- 电机 1正常工作， 设置在蜗轮 2下的升降杆上升或者下降， 此时电磁线圈 82通电， 静铁芯 8内的电磁线圈 82产生电磁力， 使动铁芯 6克服弹簧 7的抵制力而与静铁芯 8吸附 在一起， 这样， 动铁芯 6与刹车片 5之间就留出有间隙， 也即动铁芯 6解除了对刹车片 5 的摩擦阻力， 从而使刹车片 5能与电机 1的第二输出轴 12—起自由旋转， 参见图 2;
当电机 1停止工作， 即升降杆处于一定的髙度位置， 此时静铁芯 8内的电磁线圈 82 断电， 电磁线圈 82就丧失了对动铁芯 6的电磁场， 动铁芯 6在弹簧 7的预紧力作用下， 压 向位于其另一侧的刹车片 5， 与刹车片 5贴合在一起， 且两者被弹簧 7压紧， 此时， 动铁 芯 6与刹车片 5发生平面摩擦， 也即动铁芯 6连同位于其一侧的弹簧 7—起对刹车片 5的旋 转产生阻力， 使刹车片 5制动， 而电机 1的第二输出轴 12与刹车片 5相连， 这样， 就可间 接的对电机 1产生制动的效果， 使电机 1自锁， 参见图 3。

Claims

权 利 要 求
1、 一种可调家具的驱动装置， 包括有可逆转的电机 (1)， 该电机 (1)具有第一输出 轴 (11)， 并与减速传动机构传动相连， 其特征在于： 所述的电机 (1)在与所述的第一输 出轴 (11)相反方向的另一侧也设置有外伸的、 与第一输出轴 (11)同步转动的第二输出轴 (12), 并且在该第二输出轴 (12)末端处自前向后依次设置有下列部件- 一刹车片 (5)， 固定在该第二输出轴 (12)之上；
一动铁芯 (6)， 可沿轴向作限位移动；
一弹簧 (7)， 具有使所述的动铁芯 (6)向刹车片 (5)方向移动并与刹车片 (5)贴合的趋 势；
一静铁芯 (8)， 其相对电机 (1)外壳固定， 该静铁芯 (8)内嵌设有与电机 (1)同步工作的 电磁线圈 (82), 该电磁线圈 (82)所产生的磁场使动铁芯 (6)远离刹车片 (5)而向静铁芯 (8) 方向移动。
2、 根据权利要求 1所述的可调家具的驱动装置， 其特征在于： 所述静铁芯 (8)采用 如下方式相对电机 (1)外壳固定： 一固定支架 (4)以其中央孔穿过所述第二输出轴 (12)， 并相对电机 (1)外壳固定， 所述的静铁芯 (8>就固定在该固定支架 (4)的一侧。
3、 根据权利要求 2所述的可调家具的驱动装置， 其特征在于： 所述可沿轴向作限 位移动的动铁芯 (6)采用如下方式实现： 所述动铁芯 (6)外边沿开设有缺口 (61)， 该缺口 (61)上穿设有两端分别抵在固定支架 (4)与静铁芯 (8)之间的定位销 (62)。
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