Rack bar and steering apparatus
US11781633B2 · kind B2 · utility
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2References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 30, 2020 |
| Grant date | Oct 10, 2023 |
| Priority date | — |
| Expiry date | Jan 23, 2041 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/25
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.