| 摘要 |
A reciprocating saw (10, fig 1) comprises a housing (12, fig 1), a drive shaft 46 rotatably mounted in the housing, and a motor (20, fig 1) in the housing for driving the drive shaft. An elongate plunger 28 is located in the housing for reciprocating motion, and is driven by a wobble plate interface structure (72, 76, fig 5) and pivotally supported in a front bushing 112 in a manner permitting the plunger to rotate about an axis of rotation aligned with a longitudinal axis of the plunger. The plunger has a front end portion 80 for attaching a tool, and an enlarged rear end spherical portion 94. A counterweight assembly 32 is provided that includes a movable counterweight 98 and a drive arm (156, fig 3) for moving the counterweight located in the housing. The counterweight has an opening 96 for receiving the plunger, where the opening has at least cylindrical side wall portions that are sized and configured to support the rear end spherical portion of the plunger as the plunger and counterweight move relative to one another. First and second wobble plate assemblies 42, 44 are operatively connected to the drive shaft for engaging the plunger and the counterweight respectively. |
