Lubricating can

A lubricating can, specially designed to help a user to inject lubricating grease into the roller unit of a bearing, said bearing having an axle hole and an external frame, the lubricating can comprising a grease cup, a bolt, a piston, a pressing base, a bearing placement portion and a rotation driving component;

• wherein:
• the grease cup has a closed cup bottom, an open cup mouth and a cylindrical inner wall between the cup bottom and the cup mouth, a lubricating trough is defined and formed inside the grease cup, and the lubricating trough is used to hold the lubricating grease;
• the bolt is fixed inside the lubricating trough;
• the bolt has a fixed end and an extension end, wherein the fixed end is connected and fixed in the center of the cup bottom, and the extension end extends toward the cup mouth for a preset length;
• the bolt is formed with guiding threads;
• the piston is housed inside the lubricating trough, capable of moving up and down under a force;
• the piston has a pressing surface and a bearing surface opposite each other, and a lateral ring surface connecting the peripheries of the pressing surface and the bearing surface;
• in particular, the bearing surface faces upward toward the cup mouth, and the pressing surface faces downward toward the cup bottom;
• the pressing surface is to press the lubricating grease held in lubricating trough;
• the lateral ring surface is configured with at least one ring seal;
• the at least one ring seal and the cylindrical inner wall are pressed against each other in a slidable fashion;
• the center of the piston is formed with a through hole that goes through the pressing surface and the bearing surface;
• the through hole is sheathed on the bolt from the extension end of the bolt, and the through hole fits the bolt loosely, so that, relatively, the piston is not driven by the bolt;
• the piston is formed with a plurality of lubricating guide holes on the periphery of the through hole lined up in a circle with intervals;
• a plurality of lubricating guide holes goes through the pressing surface and the bearing surface;
• the pressing base comprises an upper end bearing portion and a lower end pressing portion, wherein, in the center of the lower end pressing portion, a screw hole is formed upward;
• the screw hole fits the guiding threads formed on the bolt;
• the lower end pressing portion faces the bearing surface of the piston;
• the upper end bearing portion is located above the cup mouth of the grease cup;
• the bearing placement portion is defined and formed by the space between the lower end pressing portion of the pressing base and the bearing surface of the piston;
• the bearing placement portion is for placement of the bearing;
• the lower end pressing portion of the pressing base presses downward and seals the axle hole of the bearing;
• the external frame of the bearing presses downward on the bearing surface of the piston, and defines and forms a closed lubricating margin;
• and
• the rotation driving component is configured on the upper end bearing portion of the pressing base;
• the rotation driving component can rotate when the user applies a force, and can drive the pressing base to rotate and move up and down.