PDF《滚珠丝杠的构造》

A801 A802 滚珠丝杠的构造 Construction of Ball Screws 图A-81 : 机械效率 Fig.

A-81 : Mechanical Efficiency 滚珠丝杠的技术解说 Ball Screw Technical Description 滚珠丝杠的特点 Feature of Ball Screws 机械效率高 KSS滚珠丝杠在丝杠轴与螺母之间插入钢珠形成滚动 接触, 使机械效率高达90%以上, 而所需扭矩则在传统 进给丝杠的1/3以下. 此外, 还可轻松地将直线运动转 换为回转运动 (逆动作) (图A-81) . 复式回路板循环方式 Return-plate system 复式回路板循环方式, 是通过安装在螺母内部的螺旋型偏转器将钢 球抛出, 使其沿着复式回路板的槽进行循环运动的方式. 与回路管循 环方式相比, 具有可以缩小螺母外径的优点. 在设备上安装时, 如果 将复式回路板部分安装在上方, 则可使回转动作更加顺畅. The Return-plate system uses coil-type deflectors incorporated inside the Nut to pick up the steel Balls and circulate them via the Return-plate channel. This system has the advantage of allowing the use of a Nut that is smaller in diameter than those employed in Return-tube systems. In addition, the upward-angle installation of the Return-plate ensures even smoother rotation. 端盖式循环方式 End-cap system 端盖式循环方式, 是指钢珠沿着丝杠轴与螺母之间的槽滚动前行, 从 安装在螺母两端的循环部件 (端盖) 上的通路穿过螺母上的通孔, 返 回原位的循环方式. The End-cap system is a recirculating system in which the Balls advance by rolling through the screw groove between the Nut and the Screw Shaft. The Balls are then returned via the holes in the Nut and the channels in the recirculating sections of the End-caps on either end of the Nut. 回路管循环方式 Return-tube system 回路管循环方式, 是指通过插入螺母中的回路管的前端, 将正沿着丝 杠轴与螺母之间的槽滚动的钢珠取出, 使其穿过回路管后, 再次返回 螺纹槽的循环方式. In the Return-tube system, Balls rolling between the Nut and the Shaft are picked up from the screw groove by the end of the Return-tube built into the Nut. Then, they flow back through the Return-tube to the screw groove. 陀螺式循环方式 Internal-deflector system 陀螺式循环方式最大限度地缩小了螺母的外径及长度, 使微型滚珠 丝杠的结构更紧凑、 更轻量. 钢珠在承受轴向负载的同时, 在丝杠轴 及螺母的钢珠滚动槽中滚动时, 沿着螺母内部的陀螺槽进入相邻的 滚动槽, 然后再次返回负载区, 进行无限滚动循环. The Internal-deflector system employs a lightweight Miniature Ball Screw, which enables the Nut diameter and length to be reduced to the smallest possible size. The Balls bear the load while rolling along the screw groove between the Shaft and the Nut. The Balls are continuously circulated, transferred to the adjacent groove in the screw via the Internal-deflector channel and then back to the loaded groove area. 偏转器式循环方式 End-deflector system 偏转器式循环方式, 是指钢珠从设置于螺母内部或外部的端盖偏转 器, 穿过螺母通孔, 在原来的滚动槽内循环的方式. 与复式回路板循 环方式相比, 可缩小螺母的外径, 是一种最适用于中导程的循环方式. The Balls are circulated from End-deflector incorporated inside the Nut or outside the Nut through the hole in the Nut and the channels in the recirculating sections. Ball Nut diameter can be smaller than Return-plate system. This is suitable for the middle lead Ball Screws. 螺纹槽形状 Thread Groove profile 滚珠丝杠分为由1个弧形形成的圆弧和由2个弧形形成的拱弧两种类 型. KSS滚珠丝杠采用拱弧型. Ball screws may have either a circular arc profile, formed of a single arc, or a gothic arc profile, formed from two arcs. KSS Ball Screws feature a gothic arc profile. 轴向间隙 对于传统的三角丝杠及梯形丝杠等, 如果缩小其轴向间隙, 则会因滑动摩擦而使旋转扭矩增大. KSS滚珠丝杠即使在消 除轴向间隙的状态下也能非常轻快地转动. 另外, 通过采用 双螺母, 还可进一步提高刚性. 精度高 KSS滚珠丝杠是在恒温控制下, 采用超精密进给丝杠及螺纹 量规加工技术加工、 组装而成, 并进行了严格的检查. 其精度 高, 在准确定位方面具有高度可靠性. 寿命长 KSS滚珠丝杠采用经过热处理的适当材料加工而成, 由于进 行滚动接触运动, 因此摩擦阻力极小, 几乎不会发生磨损, 可 长期保持很高的精度. High mechanical efficiency KSS Ball Screws are fitted with steel Balls, providing rolling contact between the Nut and Screw Shaft, allowing for mechanical efficiency of over 90% and reducing the required Torque to less than one-third that of conventional Lead Screws. The design of the KSS Ball Screws also allows linear motion to be converted into rotary motion easily (Fig. A-81) . Axial play With conventional Triangular and Trapezoidal Screw threads, reducing the Axial play increases the rotational Torque due to the sliding friction. KSS Ball Screws, on the other hand, are very easily rotated, even with no Axial play. The use of Double Nuts also provides increased Rigidity. High precision KSS Ball Screws are machined, assembled, and inspected using the technology of ultra-precision Lead Screw and Screw Gauge machining, under the temperature controlled room. High precision and accurate positioning ensure high reliability in use. Long service life The Ball Screw movement results in virtually no wear, as the rolling-contact design, combined with the use of carefully selected heat-treated materials, results in an extremely low friction. This is the reason that h........