Abstract: Provided is a linear guidance device in which a track groove (30, 70) serving as an endless circulation path for balls (3) can be formed through cutting or grinding with high precision and with ease at low cost.

Abstract: Provided is a rolling guide device which can be produced easily and inexpensively by achieving a reduction in the number of parts constituting a slide member (2) and a reduction in machining worker-hours therefor.

Abstract: A linear guide device (40) as a movement guiding device, comprising a track rail (41) as a track member and a moving block (43) as a moving means slidably installed on the track rail (4) through balls (42 . . . ) installed on the track rail as a large number of rolling elements. The track rail (41), the moving block (43), the balls (42), and the other members forming the linear guide device (40) are formed of a radiolucent material. The radiolucent material desirably adopts a material of 0.18 cm?1 or less in X-ray absorption coefficient. Furthermore, ceramic coating is desirably applied to those areas of the track rail (41) and the moving block (43) receiving a load from the balls (42) which include rolling surfaces for the rolling elements. As a result, the radiolucent type movement guiding device suitably usable without being limited by installation place even under a special environment can be provided by adopting such a structure as stated above.

Abstract: Provided is a ball screw device capable of downsizing a nut member (2), simplifying a circulation structure for balls (3), in which endless circulation of the balls (3) between the nut member (2) and a screw shaft (1) can be smoothly performed, and fluctuation of a rotation torque which occurs when the screw shaft (1) rotates relative to the nut member (2) can be suppressed as small as possible. A ball circulation groove (21) corresponding to all the periphery of the screw shaft (1) is formed on the inner peripheral surface of the nut member (2). The ball circulation groove (21) includes a load rolling groove (22) opposed to the ball rolling groove (10) in the screw shaft (1) and a ball returning groove (23) connecting one end and another end of the load rolling groove (22) to each other.

Abstract: Provided is a ball joint which enhances a sealing performance between a boot seal (4) and a ball shank (1) and which can maintain this sealing performance even during swinging motion of the ball shank (1) with respect to a holder (2), making it possible to completely prevent intrusion of dust and muddy water into a ball reception portion (20) of the holder (2) The ball shank (1) is provided with a flange portion (13), with a tapered surface (16) inclined with respect to an axial direction of the ball shank (1) being formed on the flange portion (13). The boot seal (4) is constructed of an annular fixation portion fixed to the holder (2), an annular seal portion (42) tightening a shaft portion (10) of the ball shank (1) and held in press contact with the flange portion (13).

Abstract: A motion guide device 10 includes a track rail 11 as a track member and a movable member 13 mounted to the track rail 11 via a plurality of balls 12. The plural balls 12 of the motion guide device 10 are disposed in an endless circulation passage 20 composed of a loaded rolling passage 15 formed between the track rail 11 and the movable member 13, and a non-loaded rolling passage formed to the movable member 13 so as to connect one and another ends of the loaded rolling passage 15. A portion of the track rail 11 or movable member 13 in the vicinity of the rolling member rolling surface thereof contacting to the plural balls 12 is formed of a metal material, and the other portion thereof is formed of an FRP. According to such structure, there can be provided a motion guide device 10 having a high strength and a high rigidity as well as a reduced weight.

Abstract: A robot joint structure ? is composed of a metacarpal member 30 and a proximal member 40 swingably connected through a hinge 31 to a side end portion of the metacarpal member 30. The proximal member 40 includes a linear guide device 44 for an MP joint having a moving member movable in association with a self swing motion thereof, and by connecting a rod 32a and the moving member through a link mechanism 50, a driving force of an air-cylinder 32 is transmitted to the proximal member 40. On the other hand, a second robot joint structure ? is also provided with linear guide devices 48, 66, 74 and link mechanisms 69, 75, to which a driving force of the air-cylinder 62 is transmitted through a drive shaft 63 in association with a rod 62a. A robot finger is constructed by the first and second robot joint structures. According to such structures, smooth joint motion can be realized, and the robot joint structure and the robot finger having improved gripping force can be provided.

Abstract: Provided is a rolling guiding device which makes it possible to easily provide a movement block with an endless circulation path for the balls even in a case of a small-sized rolling guiding device using balls of a relatively small diameter and which can be produced easily and at low cost. In one surface of a movement block (2) opposed to a rolling groove (13) of a raceway rail (1), there is formed a track groove (21) through which balls (3) makes an endless circulation.

Abstract: There are provided a rail (10) in which a rolling member rolling surface (11) is formed along the longitudinal direction, a block (20) in which a loaded rolling member rolling surface (27) is formed in an opening (25) comprising a through hole, a plurality of balls (70) disposed and housed between the rolling member rolling surface (11) and the loaded rolling member rolling surface (27) which circulate according to the relative motion of the rail (10) and the block (20). A sectional shape at right angles to the longitudinal direction of the rail (10) and a sectional shape of the opening (25) are formed into a mutually geometrically similar longitudinal shape. The block (20) is a box type with high rigidity. A contact angle of the ball (70) can be optionally changed by changing the positions alone of the rolling member rolling surface 11 and the loaded rolling member rolling surface (27) to be machined on one type of the block (20) and the rail (10).

Abstract: A screw device is provided with a screw shaft 5 formed, on an outer peripheral surface thereof, with a ball member rolling groove 6 in form of spiral, a nut 1 formed, on an inner peripheral surface thereof, with at least single one-turn of groove 4 constituted by a loaded ball rolling groove 2 having a partial circle less than one circle of groove and corresponding to the ball rolling groove 6 of the screw shaft and a ball circulation groove 3 connecting one and other ends of the loaded ball rolling grove 2, and a plurality of balls arranged and accommodated between the ball rolling groove 6 of the screw shaft 5 and the loaded ball rolling groove 2 and the ball circulation groove 3 of the nut 1. The loaded ball rolling groove 2 and the ball circulation groove 3 of the nut 1 are formed by cutting the inner peripheral surface of the nut which was preliminarily heat-treated.

Abstract: An actuator has a hollow track rail 6 having a slit 8 extending in an axial direction thereof, a movable block 7 disposed inside the track rail 6 to be movable along the track rail, and a ball screw mechanism for moving the movable block 7 along the axial direction of the track rail 6. The track rail has, in a section perpendicular to the axial direction of the track rail, a guide portion 9 for guiding movement of the movable member 7 and an extension 11 extending from the guide portion 9 so as to cover the movable member, and a width W1 of the slit 8 of the track rail formed between the opposed extensions 11 is narrower than a width W2 of the movable member. Accordingly, the actuator can provide a high rigidity in spite of compact outer dimension.

Abstract: The present invention mainly aims to provide cutting method and cutting apparatus for manufacturing a guide rail of a rolling guide device by efficiently cut-working a long scale hardened steel. In order to achieve such object, there is provided a cutting method of linearly cutting a work surface (3) of the long scale hardened steel (2) along the longitudinal direction thereof. In this process, it is desired to arrange a plurality of CBN tools (7) along the longitudinal direction of the long scale hardened steel (2) to thereby sequentially cut the work surface (3). Furthermore, a cutting apparatus of the present invention comprises a fixing device (4) for fixing the long scale hardened steel (2), a tool rest (5) which is guided by a guide device (6) disposed along the longitudinal direction of the fixing device (4) and the CBN tool (7) cut-working the work surface (3) of the long scale hardened steel (2) held by the tool rest (5).

Abstract: A hypoid gear device is provided with a backlash eliminating unit arranged between a driven wheel and a driving pinion to be meshed with the driven wheel. The backlash eliminating unit includes a driven pinion mounted on the same shaft as that of the driving pinion so as to be meshed with the driven wheel, and an elastic member urging the driven pinion on the same shaft of the driving pinion in the direction reverse thereto.

Abstract: A traction drive power transmission device, where a lubrication oil can be stably and continuously applied for a long period to portions at which rollers and a shaft are in contact with each other, shortage of the lubrication oil does not occur at the contact portions, the lubrication oil is not wasted, and which does not impair work environment by contaminating floor surface etc. A traction drive power transmission device has at least one drive roller (12a), a follower roller (12b), and a circular cylinder-like shaft (11). The shaft (11) is held between the drive roller (12a) and the follower roller (12b). When the drive roller (12a) is rotated, rotational force by the rotation is transmitted to the shaft (11) to drive it in its axial direction. The device has a lubrication oil-delivering portion (20) with application bodies (22-1, 22-2) for applying a lubrication oil only to portions where the shaft (11) is in contact with the drive roller (12a) and the follower roller (12b).

Abstract: A circulation member of a ball screw for circulating a ball rolling on a spiral ball rolling groove formed on a screw shaft. The circulation member includes a central portion and a pair of leg portions disposed at both ends of the central portion so as to extend therefrom, the leg portions having inner peripheries having center lines inclined in directions different from each other with respect to a center line of an inner periphery of said central portion. The leg portions also have outer peripheries having center lines being parallel to each other and have thicknesses, different in circumferential directions thereof, at cross sections in directions normal to center lines of the outer peripheries of the respective leg portions.

Abstract: The present invention mainly aims to provide cutting method and cutting apparatus for manufacturing a guide rail of a rolling guide device by efficiently cut-working a long scale hardened steel. In order to achieve such object, there is provided a cutting method of linearly cutting a work surface (3) of the long scale hardened steel (2) along the longitudinal direction thereof. In this process, it is desired to arrange a plurality of CBN tools (7) along the longitudinal direction of the long scale hardened steel (2) to thereby sequentially cut the work surface (3). Furthermore, a cutting apparatus of the present invention comprises a fixing device (4) for fixing the long scale hardened steel (2), a tool rest (5) which is guided by a guide device (6) disposed along the longitudinal direction of the fixing device (4) and the CBN tool (7) cut-working the work surface (3) of the long scale hardened steel (2) held by the tool rest (5).

Abstract: A rolling guide apparatus includes a track rail having roller raceway surfaces and a roller circulation path including load roller raceway surfaces corresponding to the roller raceway surfaces, and plural rollers arranged and housed in the roller circulation paths and circulate in association with movement of a moving block relative to the track rail. Each roller has a ratio of approx. 1.5<L/Da<approx. 3. By setting the ratio of roller length to roller diameter to a value of approx. 1.5<L/Da, the basic static load rating of a rolling guide apparatus of roller type becomes greater than that of a rolling guide apparatus of ball type when the pieces of the apparatus are of same model. By setting the ratio to a value of L/Da<approx. 3, occurrence of skew is prevented without failure without involvement of rigorous dimensional control of the axial clearance.

Abstract: The present invention mainly aims to provide cutting method and cutting apparatus for manufacturing a guide rail of a rolling guide device by efficiently cut-working a long scale hardened steel. In order to achieve such object, there is provided a cutting method of linearly cutting a work surface (3) of the long scale hardened steel (2) along the longitudinal direction thereof. In this process, it is desired to arrange a plurality of CBN tools (7) along the longitudinal direction of the long scale hardened steel (2) to thereby sequentially cut the work surface (3). Furthermore, a cutting apparatus of the present invention comprises a fixing device (4) for fixing the long scale hardened steel (2), a tool rest (5) which is guided by a guide device (6) disposed along the longitudinal direction of the fixing device (4) and the CBN tool (7) cut-working the work surface (3) of the long scale hardened steel (2) held by the tool rest (5).

Abstract: A coolant in a state of solution in which a water-soluble substance is dissolved is further included a sodium nitrite as additive by an amount of not less than 0.345 weight % for preventing crevice corrosion from causing particularly to a machining device such as machining center.

Abstract: The present invention provides a track rail mounting structure of a rectilinear guide apparatus comprising a track rail having a rotating/running surface where a plenty of rotating/running bodies rotate and run; an endless circulation route for guiding the plenty of rotating/running bodies; and a slider movably arranged with respect to the track rail via the rotating/running bodies; wherein a base where the track rail is mounted has a groove for inserting a bottom portion of the track rail, so that the bottom portion of the track rail is inserted into the groove, and a pressure member is provided for pressing at least one side surface of the track rail toward an inner side surface of the groove.