公开(公告)号：US11781633B2

公开(公告)日：2023-10-10

申请号：US16833907

申请日：2020-03-30

申请人： JTEKT CORPORATION

发明人： Yoshiaki Izumi ,  Hirofumi Ishimi ,  Isao Torii

IPC分类号： F16H55/26 ,  F16H55/06 ,  H05B6/02 ,  B62D3/12 ,  F16H55/32

CPC分类号： F16H55/06 ,  H05B6/02 ,  B62D3/126 ,  F16H2055/325

摘要： A rack bar includes: a rack tooth row including a plurality of rack teeth meshing with pinion teeth; a hardened layer provided continuously over an entire circumference of the rack tooth row; and a center portion provided inside the hardened layer and having lower hardness than the hardened layer. When the rack bar is viewed in an axial direction of the rack bar, a depth of the hardened layer from the following positions i), ii), and iii) increases in this order: i) a bottom land of the rack teeth; ii) a side of the rack bar relative to the bottom land; and iii) a back of the rack bar relative to the bottom land.