公开(公告)号：US06244122B1

公开(公告)日：2001-06-12

申请号：US09164784

申请日：1998-10-01

申请人： Chi-Hua Hsu ,  Stuart Smith ,  Gurpreet Singh

发明人： Chi-Hua Hsu ,  Stuart Smith ,  Gurpreet Singh

IPC分类号： F16H2520

CPC分类号： B23Q5/408 ,  F16H25/20 ,  Y10T74/18576 ,  Y10T74/1868

摘要： A feed screw and nut mechanism includes a nut having an internally threaded bore which threadingly engages an externally threaded feed screw. A runner bearing is attached to the nut and projects outwardly therefrom, and a dummy runner bearing is attached to the nut and projects outwardly therefrom and is angularly displaced from the runner bearing about the feed screw axis. The mechanism includes a stationary runner defining a runner surface that is engaged by the runner bearing to prevent rotation of the nut, and a dummy runner defining a dummy runner surface that engages the dummy runner bearing. The dummy runner and dummy runner bearing are biased toward each other such that the nut is rotatably biased in a direction to urge the runner bearing against the runner surface. The nut includes at least one rotatable drive bearing having a rotation axis perpendicular to the feed screw axis, and at least one rotatable driven bearing connected to the carriage and having a rotation axis perpendicular to both the feed screw axis and to the axis of the drive bearing. The drive and driven bearings make contact at their cylindrical surfaces to form a crossed bearing coupling for minimizing transmission to a carriage of force components which are not parallel to the axial direction along which the carriage travels. In a preferred embodiment, the nut mechanism includes a slave carriage, connected to the carriage, which supports a pair of crossed bearing couplings and which is rotatably connected to the nut to isolate the slave carraige from rotation of the nut about a transverse axis.

摘要翻译： 进给螺杆和螺母机构包括具有内螺纹孔的螺母，螺纹孔螺纹地接合外螺纹进料螺杆。 一个转轮轴承安装在螺母上并向外伸出，一个虚拟的滚珠轴承装在螺母上并向外突出，并从进给螺杆轴线的转轮轴承角度上移位。 该机构包括一个固定的流道，其限定了一个流道轴承，该流道表面与流道轴承啮合以防止螺母的转动;以及一个模拟流道，限定了一个虚拟流道表面，该虚拟流道与虚拟流道轴承相配合。 虚拟赛跑者和虚拟赛跑者轴承彼此偏置，使得螺母沿着使流道轴承抵靠流道表面的方向被可旋转地偏置。 螺母包括至少一个具有垂直于进给螺杆轴线的旋转轴线的可旋转驱动轴承，以及至少一个可旋转的从动轴承，其连接到滑架并且具有垂直于进给螺杆轴线和驱动轴线的旋转轴线 轴承。 驱动轴承和从动轴承在其圆柱形表面处接触以形成交叉的轴承联接器，以最小化传递到托架的力部件的托架，该部件不平行于托架运动所沿的轴向方向。 在优选实施例中，螺母机构包括连接到滑架的从动托架，其支撑一对交叉的轴承联接器，并且可旋转地连接到螺母，以使从动件与螺母绕横向轴线旋转。