Linear motion guide unit

A linear motion guide unit comprising a track rail having first raceway grooves on lengthwise sides thereof, a slider conforming to the track rail to fit over the track rail for movement relatively to the track rail and also having second raceway grooves confronting the first raceway grooves, and a recirculating circuit allowing rolling elements to run through there, the recirculating circuit including a load raceway defined between the first and second raceway grooves, a turnaround formed in the slider and connected at any one end thereof with the load raceway, and a return passage formed in the slider and connected to another end of the turnaround;

• wherein the slider is composed of a carriage including an upper major section extending in opposition to and parallel with an upper surface of the track rail and sidewise opposing wings depending downward from widthwise opposing side edges of the upper major section to extend over the lengthwise sides of the track rail, one to each side, and a composite carriage frame including end caps arranged on forward and aft ends of the carriage, one to each end, and side walls integral with the end caps and extending along sidewise outside surfaces of the carriage;
• wherein the carriage has on the forward and aft ends thereof first engaging means, while the end caps have second engaging means that will come into fitting engagement with the first engaging means, and
• wherein the composite carriage frame is made warped elastically to allow the lengthwise opposing end caps to embrace the forward and aft ends of the carriage, whereby the second engaging means of the composite carriage frame come into fitting engagement with the first engaging means of the carriage to unite the composite carriage frame with the carriage.

A linear motion guide unit;

• comprising a track rail having first raceway grooves on lengthwise sides thereof, a slider conforming to the track rail to fit over the track rail for movement relatively to the track rail and also having second raceway grooves confronting the first raceway grooves, and a recirculating circuit allowing rolling elements to run through there, the recirculating circuit including a load raceway defined between the first and second raceway grooves, a turnaround formed in the slider and connected at any one end thereof with the load raceway, and a return passage formed in the slider and connected to another end of the turnaround;
• wherein the slider is composed of a carriage including an upper major section extending in opposition to and parallel with an upper surface of the track rail and sidewise opposing wings depending downward from widthwise opposing side edges of the upper major section to extend over the lengthwise sides of the track rail, one to each side, and a composite carriage frame including end caps arranged on forward and aft ends of the carriage, one to each end, and side walls integral with the end caps and extending along sidewise outside surfaces of the carriage;
• wherein the carriage has on the forward and aft ends thereof first engaging means, while the end caps have second engaging means that will come into fitting engagement with the first engaging means, and
• wherein the composite carriage frame is composed of a first composite component that is made up of first inside end cap parts and first side wall panels integral with the first inside end cap parts, and a second composite component that is made up of second outside end cap parts and second outside side wall panels integral with the second outside end cap parts.