초록 ▼

A method of manufacturing a valve sleeve is disclosed which is adapted to construct an oil rotary valve together with a valve rotor, and a valve sleeve of a configuration which is suitably formed by carrying out the method is also disclosed. The valve sleeve has an axially extending groove in its in

A method of manufacturing a valve sleeve is disclosed which is adapted to construct an oil rotary valve together with a valve rotor, and a valve sleeve of a configuration which is suitably formed by carrying out the method is also disclosed. The valve sleeve has an axially extending groove in its inner surface, and the bottom surface of the groove has a portion which is disposed at an angle with respect to the axis. The method of manufacturing comprises shaping a cylindrical member having an inner and an outer diameter, both of which are greater than those of a valve sleeve to be manufactured, inserting a punch into the material, and applying a compression to the material from the radially outside thereof to cause the internal surface of the material to bear against the punch.

대표청구항 ▼

A method of manufacturing a valve sleeve having a plurality of axial grooves formed in the internal surface of a hollow cylindrical material and which are closed at their lengthwise ends utilizing a punch pin having plural longitudinally extending guide means thereon each supporting a punch member f

A method of manufacturing a valve sleeve having a plurality of axial grooves formed in the internal surface of a hollow cylindrical material and which are closed at their lengthwise ends utilizing a punch pin having plural longitudinally extending guide means thereon each supporting a punch member for movement along the length of said guide means relative to said punch pin and a die having means defining a bore having an inner diameter which is substantially equal to the outer diameter of a valve sleeve to be manufactured and a tapered surface which is located above the bore and having a diameter which increases toward an open end into which said punch pin and valve sleeve are to be inserted, comprising a shaping of a hollow cylindrical member having an inner and an outer diameter, both of which are greater than those of said valve sleeve to be manufactured, inserting said punch into said cylindrical material and said cylindrical material into said open end of said bore, urging said punch pin and said cylindrical material further into said open end until said cylindrical material contacts said tapered surface whereupon said punch pin and cylindrical member are moved into said bore, compressing said cylindrical material with said punch pin disposed therein from the radial outside thereof, moving said punch members radially outwardly of said punch pin and said guide means in response to an insertion of said punch pin and said cylindrical member further into said bore to cause said punch pin and said radially outwardly projecting punch members to bear against the internal surface of the cylindrical member, said punch members thereby forming a plurality of axial grooves on the inside wall surface of said cylindrical member.