Camshaft belt grinder
AssigneeGeneral Motors Corporation
InventorsHenry B. Patterson, Eberhard E. Wasserbaech, Jae M. Lee
Life of this patent
Estimating the term…
Abstract
Various embodiments of multiple belt camshaft grinding machines each have grinding belt drive, contouring and support members carried on a feed table for separate control of cam contouring and grinding feed rate while the camshaft workpiece is carried on a fixed axis by a table providing axial motion for belt wear balancing oscillation and, optionally, camshaft indexing. Curved shoe or wheel contouring members allow reverse curve cam grinding. Special shoe materials and belt-shoe lubrication may be provided to reduce shoe wear. Other features are also disclosed.
Claims19
A camshaft belt grinder having a plurality of spaced grinding belts for simultaneously grinding on a camshaft a plurality of longitudinally spaced cams, one with each belt, said grinder comprising
- means for rotatably supporting a camshaft workpiece having longitudinally spaced cams,
- means for driving and tensioning said belts in paths aligned with said cams laterally of the camshaft,
- actuating means operative to engage the belts and individually urge the belts into grinding contact with their respective cams, said actuating means including curved face belt engaging members, one lying adjacent each cam and engaging the opposite side of its belt therefrom, and contouring means connected with each of the belt engaging members and operative to individually advance and withdraw their respective belt engaging members to cause the belts to grind the cam surfaces in desired configurations, and
- guide means engaging the belts beyond and ahead of their belt engaging members to limit the maximum angle of belt wrap about the curved faces of the belt engaging members,
- wherein said belt engaging members are stationary contouring shoes, and the curved faces of said shoes have hard wearing surfaces for engaging the belts.
A camshaft belt grinder having a plurality of spaced grinding belts for simultaneously grinding on a camshaft a plurality of longitudinally spaced cams, one with each belt, said grinder comprising
- means for rotatably supporting a camshaft workpiece having longitudinally spaced cams,
- means for driving and tensioning said belts in paths aligned with said cams laterally of the camshaft, and
- actuating means operative to engage the belts and individually urge the belts into grinding contact with their respective cams, said actuating means including curved face belt engaging members, one lying adjacent each cam and engaging the opposite side of its belt therefrom, and contouring means connected with each of the belt engaging members and operative to individually advance and withdraw their respective belt engaging members to cause the belts to grind the cam surfaces in desired configurations,
- wherein said plurality of grinding belts is less than the number required to simultaneously grind all the cams on a camshaft workpiece and portions of said belt driving and tensioning and said contouring means are movable longitudinally of the camshaft to sequentially grind selected groups of the cams.
A camshaft belt grinder having a plurality of spaced grinding belts for simultaneously grinding on a camshaft a plurality of longitudinally spaced cams, one with each belt, said grinder comprising
- means for rotatably supporting a camshaft workpiece having longitudinally spaced cams,
- means for driving and tensioning said belts in paths aligned with said cams laterally of the camshaft, and
- actuating means operative to engage the belts and individually urge the belts into grinding contact with their respective cams, said actuating means including curved face belt engaging members, one lying adjacent each cam and engaging the opposite side of its belt therefrom, and contouring means connected with each of the belt engaging members and operative to individually advance and withdraw their respective belt engaging members to cause the belts to grind the cam surfaces in desired configurations,
- wherein the belt driving and tensioning and the actuating means are all carried on a traveling feed table and the camshaft workpiece supporting means carries the camshaft for rotation on a fixed axis.
A camshaft belt grinder as in claim I wherein the camshaft workpiece supporting means is an axially movable table capable of oscillating the camshaft along its axis.
A camshaft belt grinder having a plurality of spaced grinding belts for simultaneously grinding on a camshaft a plurality of longitudinally spaced cams, one with each belt, said grinder comprising
- means for rotatably supporting a camshaft workpiece having longitudinally spaced cams,
- means for driving and tensioning said belts in paths aligned with said cams laterally of the camshaft, and
- actuating means operative to engage the belts and individually urge the belts into grinding contact with their respective cams, said actuating means including belt engaging members, one lying adjacent each cam and engaging the opposite side of its belt therefrom, and contouring means connected with each of the belt engaging members and operative individually advance and withdraw their respective belt engaging members along parallel lines of motion to cause the belt to grind the cam surface in desired configurations,
- the contouring means of adjacent belt engaging members being offset in generally opposite directions laterally from the lines of motion of their respective belt engaging members to allow closer spacing of the belt engaging members than is permitted of the contouring means.
Dependencies are inferred from the claim text.