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 ofthe 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 therack bar (11) relative to the bottom land (111v); and iii) a back (111b) of the rack bar (11) relative to the bottom land (111v).
一种齿条(11)包括:齿条齿排(112),该齿条齿排包括与小齿轮齿(9a)啮合的多个齿条齿(111);硬化层(K),该硬化层连续地设置在齿条齿排(112)的整个外周上;以及中央部分(S),该中央部分设置在硬化层(K)的内部且其硬度低于硬化层(K)的硬度。在从齿条杆(11)的轴向方向上观察齿条杆(11)时,来自下述位置i)、位置ii)和位置iii)的硬化层(K)的深度顺次增大:i)齿条齿(111)的齿底(111v);ii)齿条杆(11)的相对于齿底(111v)的侧面(111s);以及iii)齿条杆(11)的相对于齿底(111v)的背面(111b)。
Rack bar and steering apparatus
齿条杆和转向装置
2020-10-20
Patent
Electronic Resource
Chinese
IPC: | B62D MOTOR VEHICLES , Motorfahrzeuge |