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| Number | Title | Issue Date |
| 7363835 | Ball screw apparatus A ball screw apparatus includes: a screw shaft having a screw groove, a nut having a screw groove and holes, a number of balls rollably provided between the screw grooves, and a ball circulating member having an end portion to be fitted to the holes. The ball circul... | 04/29/2008 |
| 7357048 | Ball screw drive A ball screw drive comprising a spindle nut (2) that can be disposed on a spindle (1), said spindle nut (2) comprising on an inner periphery, a ball groove (3) that is arranged along a helix and defines a load-bearing channel (8) f... | 04/15/2008 |
| 7322256 | Ball screw mechanism for electric power steering apparatus A first ball circulating hole and a second ball circulating hole for connecting a circulator are bored midway at a screw groove formed on an inner circumference of a ball nut, an intermediate groove path between the first and second ball circulating holes becomes th... | 01/29/2008 |
| 7249533 | Ball screw device A ball screw device comprises a nut having a thread groove in the inner peripheral surface thereof, a screw shaft having a thread groove in the outer peripheral surface thereof and a plurality of balls interposed between the respective thread grooves. In the screw s... | 07/31/2007 |
| 7234368 | Ball screw device having lubricating structure A ball screw device includes a ball nut having an inner thread formed by a number of helical groove portions, a screw shaft having an outer thread formed by a number of helical groove portions, for threading with the inner thread of the ball nut, and a number of rol... | 06/26/2007 |
| 7216559 | Guide actuator with high radial direction load capacity The present invention relates to a new guide actuator with high radial direction load capability, which has the purpose of providing a directional force bearing way to common loading method to make the actuator can bear load and transmit with higher accuracy. On des... | 05/15/2007 |
| 7210369 | Ball screw drive In a ball screw drive comprising a spindle nut (2) that can be disposed on a spindle (1), said spindle nut (2) comprising on an inner periphery, a ball groove (3) that is arranged along a helix and defines a load-bearing channel (6... | 05/01/2007 |
| 7207234 | Ball screw In a ball screw, a nut is fitted with the outer periphery of a screw shaft, ball rolling grooves opposed to each other are formed in the screw shaft and the nut The ball rolling grooves cooperate in forming a ball rolling path therebetween. A tube as a return path d... | 04/24/2007 |
| 7185553 | Screw feed apparatus A screw feed apparatus has a screw shaft having a screw groove formed on the outer peripheral surface thereof; a nut having a screw groove formed on the inner peripheral surface thereof opposed to the outer peripheral surface of the screw shaft; a large number of ro... | 03/06/2007 |
| 7080571 | Ball screw A ball screw has a screw shaft including a spiral-shaped ball rolling groove formed in an outer peripheral surface thereof; a nut including a spiral-shaped ball rolling groove formed in an inner peripheral surface thereof; a plurality of balls disposed in a raceway ... | 07/25/2006 |
| 7062987 | Ball bearing and a continuously variable speed transmission of belt type A ball screw in a continuously variable speed transmission has an axially immovable pulley half (2) and axially movable pulley half (3) both mounted on a rotary shaft (4). The axially movable pulley half (3) is moved by a ball screw (2... | 06/20/2006 |
| 7044016 | Ball screw A ball screw having: a screw shaft having a spiral ball rolling groove; a ball nut having a ball rolling groove corresponding to the ball rolling groove; and a large number of balls interposed between the ball rolling grooves so as to roll freely; wherein the ball r... | 05/16/2006 |
| 7013747 | Internal recirculating ball screw and nut assembly An internal recirculating ball screw and nut system that is easier to manufacture and more reliant by virtue of a particular configuration of the grooves on the interior of the nut or the follower. Crossback portions of select nut grooves are arranged in a manner th... | 03/21/2006 |
| 6955468 | Linear-motion device and ball screw A linear-motion device has: a linear-motion element fitted on a shaft which moves straight along the shaft; a plurality of balls which are retained in a ball groove formed on the inner side of the linear-motion element and roll over between the ball groove and the s... | 10/18/2005 |
| 6860827 | Actuator device for manipulating movable member In an actuator device which comprises a screw shaft, a nut member, and balls, the nut member moves relatively to the screw shaft in a first axial direction and a second axial direction opposite thereto in a manner such that it is continually subjected to a load in t... | 03/01/2005 |
| 6813969 | Rocker return liner for ball nut A ball nut and return liner assembly includes a ball nut having a tubular body having a longitudinal axis, the tubular body having an inner surface and an outer surface, a plurality of arcuate grooves defined on the inner surface. A longitudinal slot is defined on t... | 11/09/2004 |
| 6736235 | Powered steering device and ball screw mechanism therefor A portion of a steering shaft 2 capable of being advanced and retracted defines a ball screw shaft 2a of a ball screw mechanism 13. A motor rotor 10 of an electrically driven motor 8 for providing a steering assist force is ... | 05/18/2004 |
| 6557431 | Fail-safe ball screw A fail-safe ball screw assembly has a double-start screw and a corresponding nut. The screw has a first helix with a truncated, smaller diameter flat and an intertwined second helix with an extended, larger diameter flat. Similarly, the corresponding nut ... | 05/06/2003 |
| 6481305 | Roller screw and roller screw roller arranging method In a roller screw, a plurality of rollers 16 interposed between a nut member 14 and a screw shaft 12 are composed of a forward-motion load roller group 17, the rollers 16 of which are arranged in such a manner that the center lines thereof are set at a gi... | 11/19/2002 |
| 6454042 | Ball screw and electrically powered steering device having the ball screw A ball screw (20) includes a bridge member (24) fitted to a rotary nut (22) and provided with a plurality of connecting grooves (28). Each connecting groove (28) connects neighboring convolutions of an inner spiral groove (26) of the rotary nut (22). The ... | 09/24/2002 |
| 6453761 | Direct attachment electric motor operated ball nut and screw linear actuator A linear actuator comprises a ball screw carrying an axially restrained rotatable ball nut driven by an electrically energized motor. An enclosing motor housing has front and rear walls with axially aligned openings for passing the ball screw. The motor h... | 09/24/2002 |
| 6439338 | Ball screw mechanism and electrically powered steering device utilizing the same A ball screw mechanism (20) compact in size, employing a minimized number of component parts and having a high load capacity includes a rotary nut (22) having an internally threaded helical groove (26) and a mounting hole (30) both defined therein, and a ... | 08/27/2002 |
| 6397697 | Ball screw In a ball screw according to the present invention, four circulation passages forming a circulation route are respectively arranged in the axial direction of the ball screw. The mounting positions of the second and third circulation passages A2 and A3 are... | 06/04/2002 |
| 6082210 | Ball connecting body and ball screw apparatus using the same A ball connecting body in which a multiplicity of balls are arranged in a line at a predetermined interval and in a freely rotating manner. The ball connecting body is installed and used in a ball endless track of a ball screw apparatus in which a screw s... | 07/04/2000 |
| 6082209 | Ball screw A ball screw includes a screw shaft 2 having an external ball-screw thread 2a, at least one ball nut 3 having an internal ball-screw thread which is opposite to the external ball-screw thread 2a of the screw shaft 2, a spiral raceway formed by combination... | 07/04/2000 |
| 5467662 | Ball nut and screw assemby with enhanced radial load capacity A ball nut and screw assembly has a conventional helical raceway and balls received therein that react load through the centerline of the assembly and an added helical raceway and balls received therein that react radial load on the ball nut to the relief... | 11/21/1995 |
| 5245884 | Ball screw mechanism A ball-screw includes a shaft 1 having two separate helical grooves 3,4 of the same pitch and spaced by half that pitch. The nut 2 includes two corresponding grooves and return bores 5 to define two endless recirculating paths for balls disposed between t... | 09/21/1993 |
| 5193409 | Multiple circuit internal ball nut return assembly with radial drop-in insert for ball screw devices A multiple circuit, ball nut and screw assembly has a helically externally grooved screw providing a screw ball race and a nut having a complemental internal helical groove providing a nut ball race. The nut has a first internal axial ball return passage ... | 03/16/1993 |
| 4924722 | Recirculating ball mechanism Recirculating ball mechanism comprising a body (10), an actuator shaft (16) rotatably mounted within the body (10) and turnable in response to rotation of an input shaft (12), an output piston (18) slidably mounted in the body (10), a bore (22) within the... | 05/15/1990 |
| 4677869 | Linear actuator A linear actuator comprising a ball screw, ball nut, and an endless ball circuit disposed between the two has an improved end closure body having a guide portion extending to approximately one revolution of the helical path around the screw out of the nut... | 07/07/1987 |
| 4186621 | Screw-nut screw transmission coupling A screw-nut screw transmission coupling in which a tubular outer innerly-grooved sleeve and an inner outerly-grooved elongate member are coupled to define a plurality of endless ducts for circulation of a plurality of ball bearings; each said endless duct... | 02/05/1980 |
