Method of machining bore surface of cylinder block and apparatus therefor
AssigneeToyota Jidosha Kabushiki Kaisha
InventorToshio Higashi
Life of this patent
Estimating the term…
Abstract
In a method of machining a surface of a bore of an aluminum cylinder block for internal combustion engines, the bore surface is machined to be formed with a number of recesses which are to be formed into oil reservoirs. The bore surface is then pressed uniformly to be plastically deformed so that each recess is narrow at its opening and broad in its inner part. The machining for formation of the recesses and the working for plastic deformation for narrowing the opening are combined together so that the bore surface is machined to have oil reservoir recesses each of which is narrow at its opening and broad at its inner part.
Claims21
A method of machining a bore surface of a cylinder block, comprising the steps of:
- machining the bore surface so that the bore surface is formed with a number of recesses;
- and
- pressing the bore surface formed with the recesses, thereby reducing a bore surface side opening of each recess to less than about 5 microns and smoothing the bore surface.
An apparatus for machining a bore surface of a cylinder block, comprising:
- means for machining the bore surface so that the bore surface is formed with a number of recesses thereon;
- and
- means for pressing the bore surface formed with the recesses, thereby reducing a bore surface side opening of each recess to less than about 5 microns and smoothing the bore surface.
An apparatus for machining a bore surface of a cylinder block, comprising:
- a roller inserted into the bore;
- means for pressing the roller against the bore surface;
- and
- means for helically moving the roller along the bore surface;
- wherein the roller includes, in an order from an inserted end side:
- a first finishing surface for finishing the bore surface so that the bore surface has a predetermined surface roughness;
- a recess forming surface for forming recesses on the bore surface, the recess forming surface having a plurality of protrusions;
- and
- a second finishing surface for reducing a bore surface side opening of each recess to less than about 5 microns and smoothing the bore surface.
A method of forming oil reservoirs in a smooth cylinder block bore surface comprising the steps of:
- forming a plurality of recesses in the smooth cylinder block bore surface, each recess having a recess opening;
- and
- pressing the cylinder block bore surface to reduce the recess openings to less than about 5 microns.
Dependencies are inferred from the claim text.