Drive mechanism, injection apparatus, and injection molding machine

An injection apparatus configured to melt a material and inject the molten material, the injection apparatus comprising:

• a cylinder;
• a screw provided inside the cylinder;
• and
• a drive mechanism configured to rotate the screw, move the screw forward, and move the screw backward,
• wherein the drive mechanism includes:
• a piston which includes a piston head and a hollow piston rod extending from the piston head in a first direction and is hydraulically moved in a direction of a central axis of the piston rod;
• a connection rod rotatable with respect to the piston and moving integrally with the piston in the direction of the central axis of the piston rod;
• and
• a rotating body which is driven to rotate around a central axis of the connection rod as a rotation axis,
• wherein the connection rod includes an insertion portion rotatably inserted into an insertion hole provided in the piston rod and a protruding portion protruding from the insertion hole in the first direction,
• wherein the rotating body is arranged around the protruding portion of the connection rod,
• wherein a plurality of external teeth extending in a direction of the central axis of the connection rod are provided on the protruding portion of the connection rod,
• wherein a plurality of internal teeth meshing with the external teeth are provided on the rotating body, and
• wherein the screw is non-rotatably connected to an end of the protruding portion of the connection rod.

An injection molding machine comprising:

• a mold clamping apparatus to which molds can be attached;
• and
• an injection apparatus configured to inject molten metal or molten resin into the molds,
• wherein the injection apparatus includes:
• a cylinder;
• a screw provided inside the cylinder;
• and
• a drive mechanism configured to rotate the screw, move the screw forward, and move the screw backward,
• wherein the drive mechanism includes:
• a piston which includes a piston head and a hollow piston rod extending from the piston head in a first direction and is hydraulically moved in a direction of a central axis of the piston rod;
• a connection rod rotatable with respect to the piston and moving integrally with the piston in the direction of the central axis of the piston rod;
• and
• a rotating body which is driven to rotate around a central axis of the connection rod as a rotation axis,
• wherein the connection rod includes an insertion portion rotatably inserted into an insertion hole provided in the piston rod and a protruding portion protruding from the insertion hole in the first direction,
• wherein the rotating body is arranged around the protruding portion of the connection rod,
• wherein a plurality of external teeth extending in a direction of the central axis of the connection rod are provided on the protruding portion of the connection rod,
• wherein a plurality of internal teeth meshing with the external teeth are provided on the rotating body, and
• wherein the screw is non-rotatably connected to an end of the protruding portion of the connection rod.