A rack bar (11) includes: a rack tooth row (112) including a plurality of rack teeth (111) meshing with pinion teeth (9a); a hardened layer (K) provided continuously over an entire circumference of the rack tooth row (112); and a center portion (S) provided inside the hardened layer (K) and having lower hardness than the hardened layer (K). When the rack bar (11) is viewed in an axial direction of the rack bar (11), a depth of the hardened layer (K) from the following positions i), ii), and iii) increases in this order: i) a bottom land (111v) of the rack teeth (111); ii) a side (Ills) of the rack bar (11) relative to the bottom land (111v); and iii) a back (111b) of the rack bar (11) relative to the bottom land (111v).
RACK BAR AND STEERING APPARATUS
ZAHNSTANGE UND LENKVORRICHTUNG
BARRE DE CRÉMAILLÈRE ET APPAREIL DE DIRECTION
2022-08-10
Patent
Electronic Resource
English