| 摘要 |
Compact damper apparatus for controlling the opposite runs of an endless driving chain passing about a sprocket wheel comprises a pair of oppositely movable spring influenced plungers working in hydraulic fluid filled cylinder bores intercommunicating through a restricted passage. To compact the apparatus, and yet allow it to be mounted with the plungers in an inclined position, the springs are housed in part within the plungers and a single air bleed hole is provided at the highest level inside the hollow interior spring housing part of the uppermost plunger, opening into the plunger/cylinder bore clearance. The proper positioning of this hole allows trapped air which otherwise adversely affects the damping characteristics, to be forced out along the clearance when the apparatus is initially operated, and yet prevents any air being sucked back into the system. An hydraulic fluid reservoir communicates with one of the cylinder bores through a non-return ball valve to ensure that the hydraulic system of the apparatus always remains fully charged. |
