Abstract: A ball screw device includes a ball circulation part having a ball circulation path. The ball circulation part is formed by combining a first split body and a second split body. The first split body has a fixing section fixed to an outer surface of a nut member. The second split body has a pair of leg sections configured to scoop up balls moving along a ball load rolling path and return the balls to the ball load rolling path, a connecting section configured to connect the pair of leg sections and disposed between the first split body and the nut member, and a pair of shoulder sections facing side surfaces of the first split body in two directions so as to sandwich the first split body between the pair of shoulder sections.

Abstract: A ball screw device or linear motion guide device has a seal member preventing dust and dirt from entering into a movable member of a linear motion guide device and seals out fine dust, dirt or like by surely contacting a seal to a shaft member without providing a large margin to the seal. The seal member includes a body portion mounted to the movable member and a lip portion contacting an outer portion of the shaft member, the lip portion has an oblique surface having an axial section inclining with respect to its axial direction, the body portion has an urging member urging the lip portion in a diameter direction of the shaft member and a reinforcing portion reinforcing the body portion. The urging member is located on the reinforcing portion side than the tip end of the lip portion in the axial sectional shape of the lip portion.

Abstract: A ball screw device includes a ball circulation part having a bail circulation path. The ball circulation part is formed by combining a first split body and a second split body. The first split body has a fixing section fixed to an outer surface of a nut member. The second split body has a pair of leg sections configured to scoop up balls moving along a ball load rolling path and return the balls to the ball load rolling path, a connecting section configured to connect the pair of leg sections and disposed between the first split body and the nut member, and a pair of shoulder sections facing side surfaces of the first split body in two directions so as to sandwich the first split body between the pair of shoulder sections.

Abstract: A motion guide device for preventing interference of belt members with guide grooves. The motion guide device includes an endless circulation path for rolling elements, and a coupling member received in the endless circulation path. The endless circulation path includes a load rolling element path, a rolling element return path, and a direction-changing path. The direction-changing path includes a guide groove for the coupling member, which has an outer circumferential guide surface and an inner circumferential guide surface. The guide groove has a maximum width at a midpoint of a path within a range of from a coupling end between the direction-changing path and the load rolling element path or the rolling element return path to a center portion of the direction-changing path, and the groove width at the coupling end and the groove width at the center portion are smaller than the maximum value of the groove width.

Abstract: Provided is a motion guide device capable of preventing interference of belt members with guide grooves to smoothly circulate the belt members through a direction-changing path, thereby being capable of smoothly circulating rolling elements through an endless circulation path. The motion guide device includes the rolling elements, a track rail on which the rolling elements are caused to roll, a moving block having formed therein the endless circulation path for the rolling elements, and a coupling member received in the endless circulation path. The endless circulation path includes a load rolling element path, a rolling element return path, and the direction-changing path. The guide groove for the coupling member, which is formed in the direction-changing path, has an outer circumferential guide surface and an inner circumferential guide surface, each of which is formed into a smoothly continuous shape.

Abstract: A ball screw device or linear motion guide device has a seal member preventing dust and dirt from entering into a movable member of a linear motion guide device and seals out fine dust, dirt or like by surely contacting a seal to a shaft member without providing a large margin to the seal. The seal member includes a body portion mounted to the movable member and a lip portion contacting an outer portion of the shaft member, the lip portion has an oblique surface having an axial section inclining with respect to its axial direction, the body portion has an urging member urging the lip portion in a diameter direction of the shaft member and a reinforcing portion reinforcing the body portion. The urging member is located on the reinforcing portion side than the tip end of the lip portion in the axial sectional shape of the lip portion.

Abstract: A rolling-element screw device includes: a large number of rolling elements; a screw shaft having an outer periphery on which a rolling groove for the large number of rolling elements is helically formed; a nut member which has a through-hole through which the screw shaft is passed and which is threadedly engaged with the screw shaft through intermediation of the large number of rolling elements; a lubricant supply hole formed through the nut member from an outer peripheral surface of the nut member to an inner peripheral surface of the nut member; a lubricant tank mounted to the outer peripheral surface of the nut member and comprising an accommodating chamber for lubricant; and a lubricant applying body standing from the lubricant tank, and inserted into the lubricant supply hole along with amounting operation of the lubricant tank with respect to the nut member.

Abstract: Provided is a rolling-element screw device which does not sacrifice a stroke distance of a nut member (2) although carrying a sufficient amount of lubricant, or hinder heat radiation of the nut member (2), and contributes to facilitation of a replacement operation of a lubricant tank (4).