An actuator is equipped with a body and a slider. Body side rail grooves are formed in side wall portions that constitute the body. On the other hand, slider side rail grooves are formed in the slider. Body side guide rails and slider side guide rails are provided in the body side rail grooves and the slider side rail grooves, respectively. Circular arc grooves serving as ball grooves are formed by body side ball receiving portions of the body side guide rails, and slider side ball receiving portions of the slider side guide rails.

A supporting device for a rail member includes a first supporting frame and a second supporting frame. The first supporting frame has a first supporting means including a first supporting part and a second supporting part. The second supporting frame has a second supporting means including a third supporting part and a fourth supporting part. The first supporting means of the first supporting frame and the second supporting means of the second supporting frame are configured to support each other. Wherein, a rail member is configured to be connected to one of the first supporting frame and the second supporting frame, the first supporting part of the first supporting frame is configured to support the third supporting part of the second supporting frame, and the second supporting part of the first supporting frame is configured to support the fourth supporting part of the second supporting frame.

The present invention discloses a rolling-bulging forming hydraulic machine for tubular products, which includes a frame. The frame is provided with an upper rolling mechanism, a lower rolling mechanism, a fixed liquid bulging hydraulic cylinder and a movable liquid bulging hydraulic cylinder. The upper rolling mechanism and the lower rolling mechanism are arranged oppositely, and the upper rolling mechanism and the lower rolling mechanism are used to roll surfaces of a to-be-machined tubular product. The fixed liquid bulging hydraulic cylinder and the movable liquid bulging hydraulic cylinder are arranged oppositely, and the fixed liquid bulging hydraulic cylinder and the movable liquid bulging hydraulic cylinder are used to perform hydraulic bulging on the to-be-machined tubular product.

A sliding member includes a carbon transfer layer and can superiorly effectively decrease friction and reduce wear. A method produces the sliding member. The sliding member includes a substrate and a carbon transfer layer. The carbon transfer layer is disposed on the surface of the substrate and includes both sp.sup.2 bonded carbon and sp.sup.3 bonded carbon. The carbon transfer layer preferably has a ratio sp.sup.3/(sp.sup.2+sp.sup.3) of the sp.sup.3 bonded carbon to the totality of the sp.sup.2 bonded carbon and the sp.sup.3 bonded carbon of 0.1 or more.

A precision linear bearing is designed to minimize the points of contact, rolling and rubbing, to reduce particulates and FOD while ensuring stability and accuracy in a manner suitable for a clean room environment. The linear bearing comprises at least first and second bearing layers within a one-piece housing. Each bearing layer comprises at least three roller bearing spaced around the axial bore in a first plane within the housing, each roller bearing having an axis of rotation substantially perpendicular to the axial bore and projecting into said axial bore for engagement of a linear member extending through the axial bore. Each roller bearing suitably engages the linear member at a single point of contact. The layers are rotationally offset from one another such that the roller bearings contact different positions around the circumference of the linear member. The linear bearing may be configured to engage the inner surface of a cylindrical member.

A machine tool includes: a movably configured saddle; and a bed having a sliding surface supplied with a lubricant and allowing the saddle to slide thereon, and receiving the weight of the saddle. The sliding surface has a recess continuously extending in a direction in which the saddle moves. By this configuration, a machine tool which easily holds a lubricant on a sliding surface and a method for producing a structure for the machine tool having the sliding surface are provided.

A seat track assembly including a first rail configured to move along a second rail. The assembly may include a roller cage disposed at least partially between the first rail and the second rail. In embodiments, the assembly includes a stopper that projects from an inner surface of the second rail and is configured to restrict movement of the roller cage while the movement of the first rail relative to the second rail is independent of the stopper.

A linear guide device including an actuator including: a base section; a slider slidably provided to the base section; and guide sections disposed between the base section and the slider in a state that the guide sections are extending in the sliding direction of the slider. DLC films are formed on the guide sections, and the guide sections are locked to the slider such that the guide section can slide in a state that the DLC films are applying a predetermined preload with respect to the base section.

The invention relates to a linear guide (1) having at least one inner and at least one outer profile-member (2, 3), the outer profile-member (3) at least partially surrounding the inner profile-member (2) and the profile-members (2, 3) being guided one inside the other by means of at least two linear guiding means which are preferably arranged diametrically opposite each other, wherein at least a portion of a first linear guiding means is arranged in a floating manner.

In a cryogenic refrigerator, a scotch yoke mechanism includes an eccentric rotating body and a yoke plate that reciprocates by rotation of the eccentric rotating body. A displacer is connected to a yoke plate so as to reciprocate together with the yoke plate. A cylinder houses a displacer, and an expansion space for refrigerant gas is formed in a space with the displacer. An airtight container is provided on a high-temperature side of the cylinder and includes a housing space housing a scotch yoke mechanism and receive the refrigerant gas discharged from the expansion space. The airtight container includes a supporting unit that supports a side portion of the yoke plate so as to restrict tilting of the yoke plate around a rotary shaft of the eccentric rotating body.