| 摘要 |
A hydraulic automatic tensioner is provided with: a cylinder (10); a valve sleeve (13) raised within the cylinder (10); a rod (14) provided within the valve sleeve (13); a pressure chamber (15) formed between the valve sleeve (13) and the rod (14); a reservoir chamber (24) formed between the cylinder (10) and the valve sleeve (13); a plunger (28) axially slidable relative to both the valve sleeve (13) and the rod (14); and a retainer ring (34) for preventing the plunger (28) from being dislodged from the valve sleeve (13) and the rod (14). Depending on whether an engine (E) is being operated normally or being re-started by an ISG (51), a flow passage for hydraulic oil, which leads from the pressure chamber (15) to the reservoir chamber (24), is selected to adjust damping force, and consequently belt tension is always maintained at an appropriate level. |
