Piston turning machine
AssigneeF. Jos. Lamb Company
InventorFrank C. Skrentner
Life of this patent
Estimating the term…
Abstract
A lathe type piston turning machine wherein a single point cutting tool is controlled simultaneously by two separate cams to generate a desired contour on a piston which varies in both radial and axial cross section.
Claims15
A machine for turning a non-cylindrical piston of elliptical cross section which comprises, a support, means on said support for rotating a piston about its longitudinal central axis, a cylindrical cam having an elliptical cross section which corresponds in shape with the desired elliptical cross section of the piston, the longitudinal central axis of the cam being parallel to the axis of rotation of the piston, means for rotating the cam about is central axis at the same speed as the piston, a linear cam having a profile corresponding to the desired profile of the outer surface of the piston in axial section, support means for the linear cam, a cam follower adapted to follow the profile of the linear cam, support means for the cam follower, one of said support means being fixedly supported relative to said support and the other being displaceable in a direction parallel to the axis of rotation of the piston, said displaceable support means also being displaceable in a direction perpendicular to the rotating axis of the piston in response to relative movement between the linear cam and the cam follower, a tool holder mounted on the displaceable support means for movement therewith in a direction parallel to the axis of rotation of the piston and for movement thereon toward and away from said axis, a cutting tool on said tool holder adapted to machine the outer surface of the piston when the piston is rotated an the tool is moved axially thereof, a second cam follower mounted on said tool holder in fixed relation to said cutting tool and adapted to follow the contour of the elliptical cam when the latter is rotated and means for moving the displaceable support means in a path parallel to the axis of rotation of the piston whereby, when the piston is rotated and the displaceable support means are displaced in a path parallel to the axis of rotation of the piston, the cutting tool moves axially of the piston to generate thereon the profile of the linear cam and simultaneously moves radially of said axis to generate thereon the elliptical profile of the cylindrical cam.
A machine for turning a non-cylindrical piston of elliptical cross section comprising, means for supporting and rotating a piston about its central longitudinal axis, a cylindrical cam having an elliptical cross section corresponding in shape to the desired elliptical configuration of the piston, means for rotating the cam about its central longitudinal axis in unison with the piston, a cam follower engaging said cam and movable radially thereof in response to rotation of the cam, a first output member movable in proportional relation to the radial movement of said cam follower, a linear cam having a cam profile which corresponds to the desired surface profile of the piston in axial section, a cam follower engaging said linear cam and adapted to produce relative movement therebetween in a direction generally perpendicular to the linear cam profile in response to relative longitudinal movement therebetween, a second output member movable in proportional relative to said relative movement between the linear cam and its cam follower in said perpendicular direction, a cutting tool movable axially of the rotating piston to machine the surface thereof and means operably connecting the cutting tool with said first and second output members to move the tool radially of the piston as it travels axially thereof such that the path generated by the cutting tool corresponds to the algebraic sum of said movements of said first and second output members.
Dependencies are inferred from the claim text.