Gearbox for vehicle seat adjustment mechanism

A vehicle seat adjustment mechanism comprising:

• a gearbox;
• a first gear received in the gearbox and rotatable relative to the gearbox about a first axis;
• a second gear received in the gearbox and rotatable relative to the gearbox about a second axis that is perpendicular to the first axis, wherein the first and second gears are meshingly engaged with each other;
• a motor driving the first gear, wherein the motor has a maximum rotational velocity of 5,500 revolutions per minute;
• and
• a spindle screw meshingly engaged with the second gear and extending through the second gear along the second axis,
• wherein the spindle screw is selected from the group consisting of:
• a first spindle screw having trapezoidal threads and defined by Tr 8×3 (P1.5) (8 mm nominal diameter, 3 mm lead, and 1.5 mm pitch),
• a second spindle screw having trapezoidal threads and defined by Tr 9×3 (P1.5) (9 mm nominal diameter, 3 mm lead, and 1.5 mm pitch),
• a third spindle screw having trapezoidal threads and defined by Tr 11×4 (P2) (11 mm nominal diameter, 4 mm lead, and 2 mm pitch), and
• a fourth spindle screw having trapezoidal threads and defined by Tr 12×4 (P2) (12 mm nominal diameter, 4 mm lead, and 2 mm pitch),
• wherein the gearbox includes:
• a first portion including a first body, the first body defining a first longitudinal recess and a first peripheral recess in fluid communication with the first longitudinal recess;
• and
• a second portion including a second body, the second body define a second longitudinal recess and a second peripheral recess in fluid communication with the second longitudinal recess,
• wherein the first body includes a first curved surface that is concave,
• wherein the second body includes a second curved surface, the second curved surface being convex and having an equal and opposite curvature compared to the first curved surface, and
• wherein in an assembled configuration:
• the first curved surface is in contact with the second curved surface,
• the first longitudinal recess communicates with the second longitudinal recess to define a longitudinal passage, and
• the first peripheral recess communicates with the second peripheral recess to define a peripheral receptacle.