Abs pump output pulsation dampener

Abstract

The ABS pump output pulsation dampening device (59) comprises a body (10) having disposed therein a pressure source (12) communicating with an inlet line (14) that transmits pressure to an outlet line (16) via an accumulator or storage chamber (20). The body (10) receives at an open end (13) a spring (38) operated accumulator (30) having an accumulator piston (36) received within said accumulator chamber (20). One end (50) of the accumulator piston (36) includes an interior opening (32) which receives slideably and with clearance a dampening piston (60) and a resilient member (62) which biases the dampening piston (60) into engagement with a seat (15) at the end of the inlet line (14). The dampening piston (60) includes an orifice (64) at an one end (63) adjacent the seat (15) and which communicates with a passage (65) extending through the dampening piston (60). Low fluid pressure pulsations transmitted by the pressure source (12) are dampened by the dampening piston (62) as the low pressure fluid is transmitted through the orifice (64), passage (65), interior opening (52), and clearance to the outlet line (16). Beyond a predetermined pressure level, the dampening piston (60) disengages the seat (15) to permit fluid flow therepast.