In order to solve the problem of an uneven load distribution in a double-input and double-output gearbox. based on the small-displacement Jacobi spin theory and considering the manufacturing and assembly errors of the gearbox. a Jacobi spin analysis model of the gearbox was established. In order to improve the accuracy of the three-dimensional tolerance analysis of the gearbox. https://thebanyantreers.shop/product-category/wall-hooks/