Powder metallurgy gears are commonly used in various automotive engines. Although they are very economical and practical in large batches, they also have room for improvement in other aspects. Let's take a look at the advantages and Shortcoming of sintered metal gears.

 Advantages of powder metallurgy gears

1. Generally, there are few powder metallurgy gear manufacturing processes.

2. When manufacturing gears by powder metallurgy, the material utilization rate can reach more than 95%

3. The repeatability of sintered gears is very good. Because powder metallurgy parts are formed by pressing molds, under normal conditions of use, a pair of molds can press tens of thousands to hundreds of thousands of gear blanks.

4. Powder metallurgy process can integrate several parts

5. The material density of powder metallurgy gears is controllable.

6. In powder metallurgy production, in order to facilitate the removal of the compact from the die after forming, the roughness of the working surface of the die is very good.

 Disadvantages of powder metallurgy gears

1. It must be produced in batches. Generally speaking, it is more suitable for production by powder metallurgy process if the batch is more than 5000 pieces;

2. The size is limited by the pressing capacity of the press. The press generally has a pressure of several tons to several hundred tons, and the diameter is basically within 110MM, which can be made into powder metallurgy;

3. The powder metallurgy gear is limited by the structure. Due to pressing and mold reasons, it is generally not suitable to produce worm gears, herringbone gears and helical gears with a helix angle greater than 35°. For helical gears, it is generally recommended to design the helical teeth within 15 degrees;

4. The thickness of powder metallurgy gears is limited. The depth of the cavity and the stroke of the press must be 2 to 2.5 times the thickness of the gear. At the same time, considering the uniformity of the longitudinal density of the gear height, the thickness of the powder metallurgy gear is also very important.

Powder metallurgy gears containing:spur gear, internal gear, bevel gear, planetary gear, double gear, motor gear, gearbox, drive gear, gear hub, gear ring, oil pump gear etc.