Hydraulic hammer with dampening accumulator
AssigneeCaterpillar Inc.
InventorCody T. Moore
Life of this patent
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Abstract
A hydraulic hammer for impact fracturing a work object includes a hammer shell having a cylinder body disposed between a front head and a rear head. A piston reciprocally movable within the cylinder body abut a work tool and can extend and retract the work tool from the hammer shell. To dampen momentum and impact forces, an accumulator head is attached to the back head and can accommodate hydraulic and dampening fluids in separate first and second sub-chambers. The dampening sub-chamber may directly fluidly communicate with an internal dampening fluid reservoir in the back head.
Claims19
A hydraulic hammer comprising:
- a cylinder body disposed between a back head and a front head and defining in part a cylinder bore extending along a hammer axis;
- a piston reciprocally disposed within the cylinder bore for reciprocal movement along the hammer axis, the piston including a first piston end and a second piston end;
- a seal carrier disposed in the back head and configured to receive the second piston end upon reciprocal movement of the piston along the hammer axis;
- and
- an accumulator head disposed on an axial rear end of the back head, the accumulator head defining an accumulator chamber with a membrane disposed therein separating the accumulator chamber between a hydraulic sub-chamber for accommodating a hydraulic fluid and a dampening sub-chamber for accommodating a dampening fluid, wherein the dampening sub-chamber is axially proximate to the back head.
A hydraulic hammer comprising:
- a cylinder body disposed between a back head and a front head and defining in part a cylinder bore extending along a hammer axis;
- a piston reciprocally disposed within the cylinder bore for reciprocal movement along the hammer axis, the piston including a first piston end and a second piston end;
- an accumulator head disposed on an axial rear end of the back head, the accumulator head defining an accumulator chamber with a membrane disposed therein separating the accumulator chamber between a hydraulic sub-chamber for accommodating a hydraulic fluid and a dampening sub-chamber for accommodating a dampening fluid;
- and
- an internal dampening fluid reservoir disposed in the back head and in direct fluid communication with the dampening sub-chamber disposed in the accumulator head.
Dependencies are inferred from the claim text.