With the drive system on the car power, torque and driving the continuous improvement of comfort requirements, the transmission is also increasing the number of stalls. As the volume and quality of transmission can not be increased, which increased the workload of transmission gears. So gear processing will reduce the tolerances in the gear surface contact while optimizing performance and design for the gear set aside more freedom.
Munich GLEASONHURTH marketing head THOMASM. W. SCHOLZ, stated: "car engine's power density increased significantly in recent years." Speaking for the transmission car, which means that they bear the load increased dramatically. More serious is that the transmission is also increasing the number of stalls. As the volume and quality of transmission can no longer continue to increase, and therefore the load required to increase the volume while reducing extrusion line. Transmission in the modern car is the most widely used involute helical gear.
The carrying capacity of gear materials reached the limit
GLEASONHURTH ANTOINETüRICH leaders of research and development, Dr. said: "The designer is concerned, which means that he designed the gear tooth surface must be able to withstand higher loads." To understand the sheet machine tooth surfaces are subject to the size of the force to must clearly understand the process of conducting power transmission between the number of teeth in contact. In the transmission process, only a very small tooth surface to contact with each other, which is called the surface contact area.
Gear is the use of the very small contact area to transfer the engine power. To meet the equipment specifications of the same size or smaller plate machine make higher demands, engineers have tried to use the new carrying capacity of transmission design stronger, more expensive materials to make gears. However, the factors taken into account cost of vehicles, such attempts often do not have good results.
Emphasis on precision
SCHOLZ has suggested: "You can improve the tooth surface design and manufacturing processes to improve the carrying capacity of gears." Gear carrying capacity in strengthening the many factors, there are two played a decisive significance. The first is to reduce the tooth surface geometry and the theory of the shape of the design error; the second is to avoid tooth surface of the "angular contact." These two mattress machine can be manufactured by reducing the tolerances to achieve, and this also brought gear manufacturing process had a profound effect. Gear manufacturers in the processing of high load gear is generally used when the quenching process after finishing the program, but here is the most appropriate gear grinding production process.
Mr. TüRICH explained: "The hard gear finishing materials, engineers can properly design the geometric shape of the tooth surface to accurately compensate for material deformation caused by the load."
Hard Material The first step is to determine the Drilling rig design after the tooth surface by the force of the theoretical involute shape in the compressive stress (Hertzian stress) after effects differences. Tooth grinding drum formed by wheel cutter, which in the transmission of the design phase have been identified.
If the tooth surface by the force of deformation can be made through the tooth surface modification of tooth surface area bus raised a serious force to determine the exposure to run-in position and motion control through the proper achieve this goal.
Lifting of restrictions on the geometry
Gear tooth surface by the force of overlap, that is, from left to right side of the tooth surface geometry of overlapping "distorted" by the engineers has not been enough attention. This overlap is the emergence of spiral angle and the tooth surface drum bus result of the role. In the processing of helical water well drilling rig, the wheel track only along the tooth surface processing bus direction.
Mr. TURICH concluded: "To avoid this overlapping tooth force or have the purpose of exerting influence on the tooth surface overlap, you can change the grinding tool along the axis changed the theory of the pressure angle to achieve."
But this brings a new problem, that is, looking for ways to accomplish this task the wheel dressing wheel dressing tool. Because of the high precision transmission gears, so in a relatively short period of time using conventional tools or forming wheel trimmer is unable to complete this task. Trimmer on the market tried to use the right basic shape and complex multi-axis motion control to achieve a solution for this task are due to reach the gear is extremely tight tolerances in the application by the many restrictions.
GLEASON successfully developed by the company and applied for patent protection ANTI-TWIST technique to solve the problem of overlapping the tooth surface. The use of non-precision cylindrical screw meshing angle in the role of the ordinary wheel dressing tool feed movement and accurate definition of the hollow shapes added together. As a result, not only avoid duplication of tooth surface, as well as possible the positive direction or negative direction along the feed. ANTI-TWIST technology equipment, production capacity will not be limited, but also can easily TWG series grinding machine in the original equipment installed on the fill. This new generation of gear transmission design provides greater space for freedom.