Barrel cleaning system

A pneumatic motor unit for driving a brush assembly through a bore, said pneumatic motor unit comprising

• a vibratory motor having an internal reciprocating annular piston riding between an axially positioned spindle and an outer sleeve, a nose end cap and a tail end cap sealing the outer sleeve,
• a generally cylindrical outer sidewall surrounding the outer sleeve and being fixedly attached to the nose end cap and the tail end cap, said outer sidewall having a nose end and a tail end, said generally cylindrical outer sidewall having an outside diameter,
• a nose end centralizer body mounted to the nose end of the generally cylindrical sidewall, said nose end centralizer body forming a guide to facilitate said pneumatic motor unit being received in a bore to be cleaned, and
• a tail end centralizer body mounted to the tail end of the generally cylindrical sidewall, said tail end centralizer body forming a guide to facilitate said pneumatic motor unit being received in a bore to be cleaned.

A brush assembly for attachment to a pneumatic motor unit for driving a bore cleaning brush assembly through a bore, said brush assembly comprising

• a mandrel having an annular flange, a shaft extending axially from the annular flange,
• a nose end and a tail end,
• a nose cone mounted on the nose end of the mandrel, and
• a first collar shaped brush longitudinally fixedly mounted on the shaft.

A vibratory motor comprising

• a cylinder having a longitudinal axis,
• a spindle having an axially extending passage mounted along the longitudinal axis of the cylinder, and
• a tubular piston slidably mounted between the spindle and the cylinder,
• wherein an annular distribution chamber is defined between the spindle and the piston,
• wherein a first chamber is formed between a first end of the piston and a first end of the cylinder,
• wherein a second chamber is formed between a second end of the piston and a second end of the cylinder,
• wherein the hollow spindle defines at least one inlet port which defines a flow path between the axial passage and the distribution chamber when the piston is in a first longitudinal position,
• wherein the cylinder defines at least a first exhaust port which defines a flow path leading from the first chamber when the piston is in a second longitudinal position and at least one second exhaust port leading from the second chamber when the piston is in a third longitudinal position,
• wherein when the first exhaust port is blocked by a portion of the piston during a period when the second exhaust port forms the flow path and the second exhaust port is blocked by the piston during a period when first exhaust port forms the flow path,
• wherein the inlet port is blocked by a first portion of the piston when the first exhaust port is blocked and by a second portion of the piston when the second exhaust port is blocked,
• wherein the piston defines at least one first flow path leading from the annular distribution chamber to the first chamber and at least one second flow path leading from the annular distribution chamber to the second chamber,
• and a valve means is carried by the piston to alternately open and close the first flow path and the second flow path to the annular distribution chamber responsive to a pressure difference between the first chamber and the second chamber.