Bearing bush for use in toggle
AssigneeOiles Corporation
InventorsMaki Hirayama, Taku Watakabe
Life of this patent
Estimating the term…
Abstract
A bearing bush 1 for use in a toggle has a cylindrical metallic base material 2 and a solid lubricant 3 embedded in the metallic base material 2, and the metallic base material 2 has dead end grooves 5 formed in a cylindrical inner peripheral surface 4, an annular groove 6 formed in the cylindrical inner peripheral surface 4, and circular holes 7a and 7b as well as 7c and 7d formed in each of a pair of semicylindrical inner peripheral surfaces 4a and 4b adjacent to each other in an axial direction X and two pairs of semicylindrical inner peripheral surfaces 4c and 4d sandwiching the pair of semicylindrical inner peripheral surfaces 4a and 4b in a circumferential direction R and adjacent to each other in the axial direction X in each pair.
Claims20
A bearing bush for use in a toggle and interposed between a pin and a pair of links of a toggle type mold clamping apparatus equipped with a toggle link mechanism having at least the pair of links and the pin for coupling the pair of links relatively rotatably, comprising:
- a cylindrical metallic base material;
- and a solid lubricant embedded in the metallic base material,
- wherein the metallic base material has a plurality of circular holes formed in at least a first semicylindrical inner peripheral surface between the first semicylindrical inner peripheral surface and a second semicylindrical inner peripheral surface which are formed by dividing a cylindrical inner peripheral surface of the metallic base material into three parts in a circumferential direction and dividing the same into two parts in an axial direction, and which are adjacent to each other in the axial direction, a solid lubricant having an exposed surface exposed at the first semicylindrical inner peripheral surface being embedded in each of the plurality of circular holes, and
- wherein, if the cylindrical inner peripheral surface is developed into a plane, each of the plurality of circular holes has a center at a respective vertex of each of a plurality of virtual rhombuses formed by a plurality of first virtual line segments which are inclined in one direction at a predetermined first angle with respect to a circumferential line perpendicular to the axial direction and extending in the circumferential direction, and extend in parallel in such a manner as to be spaced apart from each other with a predetermined first interval, and by a plurality of second virtual line segments which are inclined in a symmetrically opposite direction to the one direction about the circumferential line at the first angle with respect to the circumferential line in such a manner as to intersect the first virtual line segments, and extend in parallel in such a manner as to be spaced apart from each other with the first interval, each of the plurality of circular holes having a radius which is greater than one-fourth of a length of an axial diagonal line between diagonal lines of the rhombus and is smaller than one-half of a length of a side of the rhombus.
Dependencies are inferred from the claim text.