The evolution of linear guides was developed from linear bearings in the earliest stages, because the balls of linear bearings are not in the rolling grooves and do restrictive linear motion. Therefore, the torque cannot be transmitted, resulting in poor load capacity and short life. Therefore, it has evolved into a ball guide rod. Since the ball guide rod can only be fixed on both ends of the cylinder, it is susceptible to distortion due to the influence of the radial load. The trigger rigidity is not good, so it eventually evolved into a linear slide.
However, for linear guide rails, when the contact method of the rolling element is that the center of the circle is directly opposite to the center of the circle, we call it DF face-to-face configuration. This kind of rolling element movement is more flexible. When the linear slide is installed, even the bed There is a slight step difference on the mounting surface, and its impact will not be too great. Because the steel ball has the ability to automatically adjust to make the slider continue to maintain the reciprocating motion state, when the contact mode of the rolling element is the center of the circle back to the center of the circle, we call it the DB back-to-back configuration. It can still maintain good rigidity when the linear guide is subjected to rolling moment.
No matter what kind of linear slides, they usually have the following important components in addition to the three main categories of steel-based sliders, slides, and rolling elements: return system and end cover. A set of linear guides has two end caps, which are respectively built on both ends of the slider to form a roller body circulation pipeline. In simple terms, it is the pipeline that allows the rolling element to turn, and the rolling element retainer is installed on the slider. Before the upper guide rail, it is used to support the rolling element so as not to leave the slider. In terms of dust prevention treatment: the bottom dust-proof sheet is installed under the slider to achieve a sealing function and prevent rolling element chips from flowing into the circulation path of the rolling element. The oil scraper is installed at the outermost ends of both sides of the slider to achieve a sealing effect and prevent dust and chips from being injected into the circulation path of the rolling elements.