| 摘要 |
A variable timing apparatus, for an internal combustion diesel engine equipped with a conventional mechanical fuel injection pump, includes a tubular extender having a front flange bolted to the normal injection pump mount and a rear mounting flange bolted to the injector pump. The tubular extender houses a timing drive shaft has a first end directly coupled to the engine's timing drive and a second free end equipped with a plurality of helical splines. The injection pump drive is equipped with straight splines. A spring-biased, slidable coupler, having a front end equipped with helical splines and a rear end equipped with straight splines, couples the timing drive shaft to the injection pump drive. After engine startup, oil pressure moves the sliding coupler axially rearward approximately 1.0 cm. As the slidable coupler travels axially rearward, it rotates and advances the injection timing by approximately 25 degrees. |
| 主权项 |
1. In combination with a compression-ignition internal combustion engine having a mechanical fuel injection pump with a straight-splined drive, a normal injection pump mount, a timing drive, and an oil pump for pressurized lubrication of engine components when the engine is operational, an apparatus for advancing injection timing following engine startup, said apparatus comprising:
a tubular extender having a front flange securable to the normal injection pump mount, and a rear mounting flange to which the injection pump is securable; a timing drive shaft installable within said tubular extender, said timing drive shaft having a first end that is directly couplable to the engine's timing drive, and a second free end equipped with a plurality of helical splines; a slidable coupler, spring-biased away from the injection pump, having a front end equipped with helical splines that slidably engage the helical splines on the second free end of the timing drive shaft, and a rear end equipped with straight splines that slidably engage the straight splines of the injection pump drive, said slidable coupler being urged rearward, toward the injection pump, by oil under pressure provided by the oil pump when the engine is operating, thereby overcoming the spring biasing and advancing injection timing as the slidable coupler rotates with respect to the timing drive shaft as the helical splines of the coupler travel rearward while engaging the helical splines of the timing drive shaft. |
