Linear guideway, sliding module thereof, and circulation seat thereof

A sliding module of a linear guideway, comprising:

• a slider having a base portion and two lateral wing portions that respectively extend from the base portion, wherein inner sides of the two lateral wing portions face toward each other, and wherein the slider has two end surfaces;
• and
• two circulation seats each having an one-piece structure, wherein the two circulation seats are respectively assembled to the two lateral wing portions, and wherein each of the two circulation seats includes:
• two turning portions respectively disposed on the two end surfaces of the slider;
• a middle retaining portion having a two-stepped structure, wherein the two-stepped structure includes a connection bar and a limiting bar that is connected to the connection bar, and wherein the connection bar is connected to and arranged between the two turning portions, and a distance between two lateral surfaces of the connection bar increases along a direction away from the limiting bar;
• and
• two lateral retaining portions connected to and arranged between the two turning portions, wherein the two lateral retaining portions are respectively located at two opposite sides of the middle retaining portion;
• wherein, in each of the two circulation seats, each of the limiting bar of the middle retaining portion and the two lateral retaining portions has an injection groove formed on a boundary surface adjacent to the track, and the injection groove of the limiting bar is spaced apart from the injection groove of each of the two lateral retaining portions by a same distance.

A circulation seat of a linear guideway having an one-piece structure, comprising:

• two turning portions;
• a middle retaining portion having a two-stepped structure, wherein the two-stepped structure includes a connection bar and a limiting bar that is connected to the connection bar, and wherein the connection bar is connected to and arranged between the two turning portions, and a distance between two lateral surfaces of the connection bar increases along a direction away from the limiting bar;
• and
• two lateral retaining portions connected to and arranged between the two turning portions, wherein the two lateral retaining portions are respectively located at two opposite sides of the middle retaining portion;
• wherein each of the limiting bar of the middle retaining portion and the two lateral retaining portions has an injection groove formed on a boundary surface adjacent to the track, and the injection groove of the limiting bar is spaced apart from the injection groove of each of the two lateral retaining portions by a same distance.