The Heavy Load Gear Design With Machining Error Considered

The gear transmission is the most useful applied equipment in the industry. Due to transmit much more moment, the general method is to increase the modulus of the gear or increase the width of the gear. However, sometimes it is not very suit to increase the modulus, so the method of increasing the width became the only method. In actually, the method to increase the width of the gear is to increase the contact line between the two gears. The more larger of the width, the more larger of the length of the contact line, and the load on per length of the line will become smaller. But this method is depended on the process precision of the gear and sometimes it is too expensive. Under a low precision, the length of the contact line is also not enough, and the loading ability of the gear will be not decreased.So it is imminently to propose a new method to design the gear under the low precision and keep the capability of heavy loading. A method propose in the paper is "associated deformation ", it means all the parts of the tooth of the gear deform together, the parts which under the heavy loading will deform first and then the other parts will endure the loading, so finally all the parts of the tooth endure the loading together and the greatst stress will be decreased and the work life will be extended.This paper analyse 4 kinds of gears with diffenrent shortcoming under a low precision used simulation method on the base of the theoretical analysis. The results of the theoretical and simulated analysis show that a low precision gear with circumferential grooves will generate lower equivalent stress and contact stress under the contact condition. This method will be a good referrence to design gears under heary loading with low precison and price.