EP Gear Rack Co., Ltd.
As one of leading manufacturers, suppliers and exporters of mechanical products in China, We offer gearboxes and reducers, sprockets, industrial and conveyor chain, belts, pulleys, gears, racks, gearboxes, motors, PTO Shafts, taper lock Bushing, vacuum Pumps, screw air compressors and many other products.
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What is a rack and pinion ?
Gear racks are utilized to convert rotating movement into linear motion. A gear rack has straight teeth cut into one surface of a square or round section of rod and operates with a pinion, which is a small cylindrical gear meshing with the gear rack. Generally, gear rack and pinion are collectively called “rack and pinion”. There are many ways to use gears. For example, as shown in the picture, a gear is used with the gear rack to rotate a parallel shaft.
To provide many variations of rack and pinion, KHK has many types of gear racks in stock. If the application requires a long length requiring multiple gear racks in series, we have racks with the tooth forms correctly configured at the ends. These are described as “gear racks with machined ends”. When a gear rack is produced, the tooth cutting process and the heat treatment process can cause it to try & go out of true. We can control this with special presses & remedial processes.
There are applications where the gear rack is stationary, while the pinion traverses and others where the pinion rotates on a fixed axis while the gear rack moves. The former is used widely in conveying systems while the latter can be used in extrusion systems and lifting/lowering applications.
As a mechanical element to transfer rotary into linear motion, gear racks are often compared to ball screws. There are pros and cons for using racks in place of ball screws. The advantages of a gear rack are its mechanical simplicity, large load carrying capacity, and no limit to the length, etc. One disadvantage though is the backlash. The advantages of a ball screw are the high precision and lower backlash while its shortcomings include the limit in length due to deflection.
Characteristics of gear and rack meshing transmission
This transmission is not a single circle of its own circle. It is a form of transmission through which it can run through the bar.
Compared with the composition of gears, its important characteristics are:
(1) its tooth profile is straight, so all normal lines on it are parallel. In the case of transmission, it runs as a straight form, and its speed and orientation are the same. All of them have the same tooth shape angle, its straight line inclination angle, the standard is 20 degrees.
(2) the same side square tooth profile of each tooth on it is relatively parallel, so it is the base line to ensure the size of each position, whether it is on the dividing line and the tooth thickness of the rack and the width of the slot.