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HM120846/HM120817XD Railway train bearings
HM120846/HM120817XD is imperial TDO integral double‑cup double‑row tapered roller bearing from Boyuan, assembled with two cone assemblies HM120846 and one one‑piece double cup HM120817XD with stamped‑steel cage. It shares the identical double cup HM120817XD with HM120848/HM120817XD. The main difference is cone bore: HM120846 bore 99.957 mm vs HM120848 bore 101.600 mm. It is Class‑B derivative railway axle‑box bearing for slightly smaller journal wheelsets, also used for heavy‑duty construction machinery, mining equipment and heavy gearboxesTimken. Back‑to‑back configuration withstands heavy radial load plus bidirectional axial loads.
| 项目 Item | 公制 Metric | 英制 Imperial |
|---|---|---|
| 内径 d Bore | 99.957 mm | 3.9353 in |
| 外径 D Outer Diameter | 165.100 mm | 6.5000 in |
| 单内圈宽度 B Cone width | 49.213 mm | 1.9375 in |
| 双外圈总宽 C Double cup width | 114.300 mm | 4.5000 in |
| 装配总宽 T Assembly width | 106.581 mm | 4.1961 in |
| 重量 Weight | 8.62 kg | 19.00 lb |
| 参数 Rating | 公制 Metric | 英制 Imperial |
|---|---|---|
| C1 双列动载荷 (10⁶转) | 434 000 N | 97 600 lbf |
| C90 单列动载荷 (9000 万转) | 64 700 N | 14 500 lbf |
C90
| 113 000 N | 25 400 lbf |
| Ca90 轴向动载荷 (9000 万转) | 30 100 N | 6 770 lbf |
Double cup HM120817XD is one‑piece unit. Two HM120846 cones must be used as matched set. Do NOT interchange with HM120848 cones, bore sizes differ.
Hot mounting preferred for railway application; heating temperature ≤120℃, open‑flame heating strictly forbidden.
Verify shoulder dimensions: shaft shoulder db=111.0 mm, housing shoulder Da=154.9 mm; shaft fillet ≤1.5 mm, housing fillet ≤1.0 mm.
Fill 1/3‑1/2 of internal volume with grease; over‑greasing causes overheating.
Follow AAR railway assembly specification for installation.
