spur gear rack

Rack and pinions are used for lifting Spur Gear Rack mechanisms (vertical movement), horizontal movement, positioning mechanisms, stoppers and to let the synchronous rotation of many shafts in general industrial machinery. On the other hand, they are also found in steering systems to improve the direction of cars. The characteristics of rack and pinion systems in steering are the following: simple framework, high rigidity, small and lightweight, and superb responsiveness. With this mechanism, the pinion, installed to the steering shaft, can be meshed with a steering rack to transmit rotary movement laterlly (switching it to linear movement) to ensure that you can control the wheel. Furthermore, rack and pinions are utilized for various other purposes, such as playthings and lateral slide gates.

As a mechanical element to transfer rotary into linear movement, gear racks tend to be in comparison to ball screws. There are pros and cons for using racks instead of ball screws. The benefits of a equipment rack are its mechanical simplicity, large load carrying capacity, no limit to the distance, etc. One drawback though may be the backlash. The advantages of a ball screw are the high precision and lower backlash while its shortcomings include the limit in size due to deflection.

There are applications where the gear rack is stationary, while the pinion traverses and others where in fact the pinion rotates upon a fixed axis as the gear rack moves. The previous is used broadly in conveying systems as the latter can be utilized in extrusion systems and lifting/lowering applications.

To provide many variants of rack and pinion, KHK has various kinds of gear racks in stock. If the application requires a long size requiring multiple gear racks in series, we have racks with the tooth forms correctly configured at the ends. These are described as “equipment racks with machined ends”. When a gear rack is produced, the tooth cutting process and the heat treatment process can cause it to try & walk out true. We can control this with particular presses & remedial processes.