Abstract: A rack housing and a reduction drive housing accommodate a ball screw mechanism and a reduction drive. Within the rack housing and the reduction drive housing, a gap is provided between the left end of a nut and the rack housing, and a gap is provided between the right end of the nut and the rack housing. A groove serving as a communication path in communication with the gaps on both axial sides of the nut is provided in the outer circumferential surface of the nut. The groove is provided so as to avoid a recirculation path provided in the nut. The groove is provided axially and rectilinearly from the end of the nut that is located on the side opposite to a flange, to the flange and is provided along the flange.

Abstract: A steering apparatus includes a steered shaft; a rack housing; a ball screw nut; a bearing disposed between an inner peripheral surface of the rack housing and an outer peripheral surface of the ball screw nut, the bearing supporting the ball screw nut such that the ball screw nut is rotatable with respect to the rack housing; and a tubular rack boot covering an axial end portion of the rack housing. The rack housing includes a partition wall protruding radially inward from a cylindrical inner peripheral surface of the rack housing and separating a ball screw chamber housing the ball screw nut and an inner chamber of the rack boot. The partition wall has a through-hole through which the steered shaft extends, and a drain passage provided vertically below the through-hole and providing communication between the ball screw chamber and the inner chamber of the rack boot.

Abstract: A steering apparatus includes a steering shaft; a steered shaft; a ball screw mechanism; and a motor. A plurality of rolling elements includes large-diameter rolling elements and small-diameter rolling elements. A prescribed diameter difference is set such that when a magnitude of power transmitted between a first screw groove and a second screw groove is a prescribed value or less, only the large-diameter rolling elements transmit the power between the first screw groove and the second screw groove, and when the magnitude of the power transmitted between the first screw groove and the second screw groove exceeds the prescribed value, both the large-diameter rolling elements and the small-diameter rolling elements transmit the power.

Abstract: A steering apparatus includes a steered shaft; a rack housing; a ball screw nut; a bearing disposed between an inner peripheral surface of the rack housing and an outer peripheral surface of the ball screw nut, the bearing supporting the ball screw nut such that the ball screw nut is rotatable with respect to the rack housing; and a tubular rack boot covering an axial end portion of the rack housing. The rack housing includes a partition wall protruding radially inward from a cylindrical inner peripheral surface of the rack housing and separating a ball screw chamber housing the ball screw nut and an inner chamber of the rack boot. The partition wall has a through-hole through which the steered shaft extends, and a drain passage provided vertically below the through-hole and providing communication between the ball screw chamber and the inner chamber of the rack boot.

Abstract: A rack housing and a reduction drive housing accommodate a ball screw mechanism and a reduction drive. Within the rack housing and the reduction drive housing, a gap is provided between the left end of a nut and the rack housing, and a gap is provided between the right end of the nut and the rack housing. A groove serving as a communication path in communication with the gaps on both axial sides of the nut is provided in the outer circumferential surface of the nut. The groove is provided so as to avoid a recirculation path provided in the nut. The groove is provided axially and rectilinearly from the end of the nut that is located on the side opposite to a flange, to the flange and is provided along the flange.

Abstract: A steering apparatus includes a steering shaft; a steered shaft; a ball screw mechanism; and a motor. A plurality of rolling elements includes large-diameter rolling elements and small-diameter rolling elements. A prescribed diameter difference is set such that when a magnitude of power transmitted between a first screw groove and a second screw groove is a prescribed value or less, only the large-diameter rolling elements transmit the power between the first screw groove and the second screw groove, and when the magnitude of the power transmitted between the first screw groove and the second screw groove exceeds the prescribed value, both the large-diameter rolling elements and the small-diameter rolling elements transmit the power.

Abstract: The ball screw apparatus includes a returning way L2 by mounting a circulating member 15 in mounted holes 16, 17 formed in the ball screw nut 13. The ball screw nut 13 includes a base portion 51 and an expanding portion 52. In the base portion 50 a distance from an axis center O1 of the rack shaft 3 to a bottom portion 14a of the nut side screw groove 14 is constant, and in the expanding portion 52 the distance is larger than that of the base portion 51. The expanding portion 52 includes a connecting area 34.

Abstract: In an electric power steering system, multiple cutouts (45) are formed in a flange portion (36) formed on an axial end portion (23a) of a ball screw nut (23) of a ball screw device that drives a rack shaft. In addition, a motor shaft (6) has a thin-plate portion (44) that extends on the radially outer side of the ball screw nut (23). When the thin-plate portion (44) that extends from the motor shaft (6) is swaged into the cutouts (45) that serve as engagement recesses that have side walls in the circumferential direction, the rotation of the ball screw nut (23) relative to the motor shaft (6) is restricted.

Abstract: The ball screw apparatus includes a returning way L2 by mounting a circulating member 15 in mounted holes 16, 17 formed in the ball screw nut 13. The ball screw nut 13 includes a base portion 51 and an expanding portion 52. In the base portion 50 a distance from an axis center O1 of the rack shaft 3 to a bottom portion 14a of the nut side screw groove 14 is constant, and in the expanding portion 52 the distance is larger than that of the base portion 51. The expanding portion 52 includes a connecting area 34.

Abstract: In an electric power steering system, multiple cutouts (45) are formed in a flange portion (36) formed on an axial end portion (23a) of a ball screw nut (23) of a ball screw device that drives a rack shaft. In addition, a motor shaft (6) has a thin-plate portion (44) that extends on the radially outer side of the ball screw nut (23). When the thin-plate portion (44) that extends from the motor shaft (6) is swaged into the cutouts (45) that serve as engagement recesses that have side walls in the circumferential direction, the rotation of the ball screw nut (23) relative to the motor shaft (6) is restricted.

Abstract: A polyester film for use in a capacitor having high heat resistance, which consists of a biaxially oriented film containing a polyester (A) as a main component and a polyimide (B) and has a glass transition temperature of 105° C. to 145° C. and an elongation at break in the machine direction of 70% to 150%, offers a high glass transition temperature and excellent insulation volume resistance and insulation breakdown voltage at high ambient temperatures. This film can produce a metallized film for use in a capacitor having high heat resistance and also a film capacitor having high heat resistance.

Abstract: A biaxially oriented polyester film that is 7.0 GPa or more in either the Young's modulus in the machine direction (YmMD) or in the transverse direction (YmTD), and in the range of 55° or more and 85° or less in the circumferential half-width of the diffraction line from the crystal plane in the direction of the polyester's backbone chain that is determined through crystal orientation analysis by wide angle X-ray diffractometry performed while rotating the polyester film around its normal. The film is high in rigidity in all directions within the film plane, high in tear resistance, high in dimensional stability, and resistant to deformation under load, and have very great industrial advantages as material for high-density magnetic recording media, with wide applicability as material for electrostatic capacitor, heat transfer ribbon, and base paper for thermosensitive stencil printing.

Abstract: Disclosed is a biaxially oriented polyester film that is 7.0 GPa or more in either the Young's modulus in the machine direction (YmMD) or in the transverse direction (YmTD), and in the range of 55° to 85° in the circumferential half-width of the diffraction line from the crystal plane in the direction of the polyester's backbone chain that is determined through crystal orientation analysis by wide angle X-ray diffractometry performed while rotating the polyester film around its normal. The film is high in rigidity in all directions within the film plane, high in tear resistance, high in dimensional stability, and resistant to deformation under load, and have very great industrial advantages as material for high-density magnetic recording media, with wide applicability as material for electrostatic capacitor, heat transfer ribbon, and base paper for thermosensitive stencil printing.

Abstract: A transparent gas barrier biaxially oriented polypropylene film, comprising a base layer mainly composed of a polypropylene polymer, a polyolefin resin layer of 30 to 85 J/g in the heat of fusion formed at least on one side of the base layer, and an imperfectly oxidized alumina layer formed on the polyolefin resin layer, wherein the aluminum metal concentration in the internal portion of the imperfectly oxidized alumina layer is higher than that in the surface of the layer and that in the interface with the polyolefin resin layer, and the aluminum metal content of the imperfectly oxidized alumina layer is kept in a range of 10 to 200% nm. It is a transparent metallized gas barrier biaxially oriented polypropylene film excellent in moisture and oxygen barrier properties and also excellent in the gas barrier properties after elongation.

Abstract: The present invention relates to a biaxially oriented polypropylene film and a capacitor made thereof. The biaxially oriented polypropylene film of the invention is a biaxially oriented polypropylene film that is 98-99.5% in isotacticity, above 99% in isotactic pentad fraction, and 1-4% in the sum of the machine- and transverse-direction heat shrinkage at 120.degree. C., or a biaxially oriented polypropylene film that is less than 10 ppm.multidot.% in the product of the film's ash content and internal haze and is above 99% in isotactic pentad fraction. With this constitution, the biaxially oriented polypropylene film of the present invention has good dielectric properties at high temperatures. Furthermore, the capacitor of the invention can be used safely for a long life at operating temperatures higher by up to 20.degree. C. than the maximum operating temperature of 85.degree. C. of the conventional biaxially oriented polypropylene films.

Abstract: A polyester film-heat-bonded metal sheet is provided, which comprises a biaxially oriented polyester film or films, heat-bonded to a metal sheet by means of an adhesive layer interposed therebetween. The adhesive layer is made of a polyblend comprised of, based on the weight of the polyblend, 5 to 80 wt. % of at least one high melting point polyester having a melting point of at least 200.degree. C. and 20 to 95 wt. % of at least one low melting point polyester having a melting point of at least 100.degree. C., but not higher than a temperature which is 5.degree. C. lower than the melting point of the high melting point polyester. The polyblend may contain a minor amount of a polyolefin resin. The polyester film-heat-bonded metal sheet has good formability and is suitable for cans and other containers. The containers exhibit enhanced impact resistance, adaptability to retort treatment and corrosion resistance.