关键词: 变速器；齿轮；螺旋角；齿向修形；接触斑点

Abstract: Aiming at the common phenomenon of offset load in gear contact of heavy truck transmission, this paper puts forward a method of gear spiral angle modification, which can improve gear contact offset load by adjusting gear spiral angle modification slope and changing the spiral angle size. Taking the 12-speed transmission of heavy truck as the research object, the finite element simulation is used to numerically simulate the gear pair, and the contact spot test, noise test and fatigue test are carried out. The results show that the contact stress distribution of the improved tooth surface is uniform, the contact spot is in the middle, the noise does not change significantly and still meets the fatigue test requirements, indicating that the contact condition of the gearbox gear pair is effectively improved, and the feasibility of the proposed modification method is verified. The research provides theoretical basis and experimental reference for the correction of offset load gear of heavy truck transmission.

Key words: Transmission; Gear; Spiral angle; Axial modification; Contact spot