1. Overview. Crossed roller linear guide is a kind of high-precision, high-stiffness linear transmission system, which is widely used in various automation equipment, robots, machine tools and other fields. It transmits motion and force through the rotation of the crossed rollers, and has the advantages of high speed, high acceleration, high precision, and low friction. This article will introduce the motion principle of the crossed roller linear guide in detail.
Second, the working principle.
The crossed roller linear guide is composed of a guide rail and a cage, where the guide rail is used as a fixed part and the cage is used as a moving part. The cage realizes linear motion through the cooperation of crossed rollers and guide rails. Inside the cage, several cylindrical rollers are installed, which are staggered at 90 degrees, hence the name crossed rollers. When the cage moves on the guide rail, the contact surface between the roller and the guide rail produces rolling friction, thereby reducing the friction resistance and improving the motion efficiency.
3. Motion analysis.
1.Roller rotational motion.
When the cage moves on the guide, the rollers create a rotational motion at the contact point. This rotational motion can effectively reduce the contact stress between the cage and the guide rail, thereby improving the service life of the guide rail.
2.Roller rotation motion.
In addition to the rotational motion at the point of contact with the guide, the rollers also rotate around their own axis. This rotational motion can further reduce the frictional resistance and improve the movement efficiency of the guide.
3.Linear motion of the cage.
Due to the rotational and rotational movements of the rollers, the cage achieves linear motion on the guide rails. This linear motion is characterized by high precision and stiffness, which can meet a wide range of demanding application scenarios.
Fourth, the characteristics of the analysis.
1.High precision.
The small contact area between the rollers and the guide rails and the small radius of curvature at the contact points enable high-precision positioning and guidance. In addition, due to the rotational motion of the rollers, there is less frictional resistance between the cage and the guide rail, which reduces the error due to friction.
2.High stiffness.
Crossed roller linear guides have less contact stress between the rollers and the guide rails and are therefore able to withstand large external loads. At the same time, due to the rotational movement of the rollers, the contact stress distribution between the cage and the guide rail is more uniform, which improves the overall stiffness of the guide rail.
3.Long life.
Due to the rotational motion of the rollers and the small contact stress, the service life of the crossed roller linear guide is long. In addition, due to its simple structure and easy maintenance, its service life is further improved.
4.High speed, high acceleration.
The crossed roller linear guide has high movement speed and acceleration, and is suitable for high-speed, high-acceleration automation equipment and high-precision machine tools. Its high stiffness and low frictional resistance ensure that the equipment still maintains high precision and high stability when moving at high speeds.