The rack is a type of bar-shaped part that matches with gears and can be considered as a segment of a gear's edge with an infinite diameter.
Main Features
The tooth profile is a straight line: all points on the tooth profile have the same pressure angle, which is equal to the inclination angle of the tooth profile, known as the tooth shape angle, with a standard value of 20°.
Equal pitch and module: any straight line parallel to the tooth top line has the same pitch and module.
There is a clear pitch line: a straight line parallel to the tooth top line with a tooth thickness equal to the groove width is called the pitch line (midline), which serves as the reference line for calculating the rack size.
Main Classification
Straight rack: The tooth line is parallel to the length direction of the rack, making manufacturing and installation relatively simple. It is commonly used in linear motion transmission systems with low precision requirements and small loads, such as simple lifting devices and small conveyor systems.
Helical rack: The tooth line forms a certain angle with the length direction of the rack, providing good meshing performance, smooth transmission, and strong load capacity. However, manufacturing and installation are more difficult, and it is often used in high-speed, heavy-load linear motion transmission applications, such as large CNC machine tools and material handling mechanisms in automated production lines.
Main Parameters
Includes groove width, tooth height, root height, tooth thickness, root radius, pitch, number of teeth, module, etc.
Processing Methods
Gear hobbing: Processed using a gear hobbing cutter according to the generating method. The hobbing cutter is equivalent to a helical gear with a very large helical angle. During hobbing, in addition to the rotation of the hobbing cutter and the generating motion with the workpiece, there is also a feed motion along the workpiece's axis. It can process straight, helical, and modified tooth shape cylindrical gears with high precision and productivity.
Key seating: Processed using a key seating cutter according to the generating or shaping method. The key seating cutter is like a gear with cutting edges. During key seating, the cutter performs an up-and-down reciprocating cutting motion, along with radial feed motion and letting the cutter move. The precision of key seating is also relatively high.
Hongya Machinery Parts Co., Ltd. is located in the southern industrial zone of Renqiu City, at the center of the Beijing-Tianjin-Shijiazhuang economic circle. The transportation is convenient, the environment is beautiful, and the geographical location is unique.
Our factory adheres to the principle of "seeking development with credibility and survival with quality," continuously developing in the increasingly fierce market competition. The production equipment is constantly improving, and the quality assurance system is continuously being perfected.
The products are of high quality and low price, and the after-sales service is attentive. Based on the principle of "people-oriented and quality first," the company has won unanimous praise from customers and peers.
In the future, we will continue to work hard to improve our products and provide benefits to our customers.
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Key words:
Rack
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