They run quieter than the straight, especially at high speeds
They have a higher contact ratio (the amount of effective teeth engaged) than straight, which increases the load carrying capacity
Their lengths are great circular numbers, e.g. 500.0 mm and 1,000.0 mm, for easy integration with machine bed lengths; Straight racks lengths are generally a multiple of pi., e.g. 502.65 mm and 1005.31 mm.
A rack and pinion is a type of linear actuator that comprises a couple of gears which convert rotational motion into linear movement. This combination of Rack gears and Spur gears are generally known as “Rack and Pinion”. Rack and pinion combinations tend to be used as part of a simple linear actuator, where in fact the rotation of a shaft driven yourself or by a motor is converted to linear motion.
For customer’s that require a more accurate motion than regular rack and pinion combinations can’t provide, our Anti-backlash spur gears can be found to be used as pinion gears with our Rack Gears.
The rack product range includes metric pitches from module 1.0 to 16.0, with linear force capacities of up to 92,000 lb. Rack styles include helical, directly (spur), integrated and round. Rack lengths up to 3.00 meters are available regular, with unlimited travels lengths possible by mounting segments end-to-end.
Helical versus Directly: The helical style provides a number of key benefits more than the directly style, including:
These drives are perfect for an array of applications, including axis drives requiring exact positioning & repeatability, journeying gantries & columns, choose & place robots, CNC routers and material handling systems. Heavy load capacities and duty cycles can also be easily taken care of with these drives. Industries served include Materials Handling, Automation, Automotive, Aerospace, Machine Tool and Robotics.
Timing belts for linear actuators are typically made of polyurethane reinforced with internal metal or Kevlar cords. The most common tooth geometry for belts in linear actuators is the AT profile, which has a big tooth width that delivers high level of resistance against shear forces. On the driven end of the actuator (where the engine is certainly attached) a precision-machined toothed pulley engages with the belt, while on the non-driven end, a set pulley simply provides guidance. The non-driven, or idler, pulley is certainly often used for tensioning the belt, although some styles provide tensioning mechanisms on the carriage. The kind of belt, tooth profile, and applied tension force all determine the force that can be transmitted.
Rack and pinion systems found in linear actuators contain a rack (generally known as the “linear equipment”), a pinion (or “circular equipment”), and a gearbox. The gearbox really helps to optimize the speed of the servo motor and the inertia match of the system. The teeth of a rack and pinion drive could be directly or helical, although helical the teeth are often used due to their higher load capacity and quieter operation. For rack and pinion systems, the maximum force that can be transmitted is largely determined by the tooth pitch and the size of the pinion.
Our unique understanding extends from the coupling of linear system components – gearbox, electric motor, pinion and rack – to outstanding system solutions. You can expect linear systems perfectly designed to meet your specific application needs when it comes to the easy running, positioning linear gearrack china precision and feed force of linear drives.
In the study of the linear movement of the gear drive system, the measuring platform of the gear rack is designed in order to measure the linear error. using servo engine directly drives the gears on the rack. 
using servo engine directly drives the apparatus on the rack, and is based on the movement control PT point mode to realize the measurement of the Measuring distance and standby control requirements etc. In the process of the linear movement of the gear and rack drive mechanism, the measuring data is definitely obtained utilizing the laser interferometer to measure the placement of the actual motion of the apparatus axis. Using the least square method to solve the linear equations of contradiction, and to extend it to any number of situations and arbitrary number of fitting functions, using MATLAB development to obtain the actual data curve corresponds with design data curve, and the linear positioning accuracy and repeatability of gear and rack. This technology can be extended to linear measurement and data evaluation of the majority of linear motion system. It may also be used as the basis for the automated compensation algorithm of linear motion control.
Consisting of both helical & straight (spur) tooth versions, within an assortment of sizes, materials and quality levels, to meet almost any axis drive requirements.