Injection device
AssigneeFanuc Corporation
InventorsTakuya OSAWA, Shoutarou SEKIGUCHI
Life of this patent
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Abstract
An embodiment of the present invention provides an injection device including a screw that includes a plurality of outer circumferential protrusions, each of the plurality of outer circumferential protrusions being provided with an outer circumferential protrusion slope and a second outer circumferential protrusion slope. A bush of the injection device includes a plurality of inner circumferential protrusions, each of the plurality of inner circumferential protrusions being provided with an inner circumferential protrusion slope and a second inner circumferential protrusion slope. A rear end of each of the plurality of outer circumferential protrusions and a front end of each of the plurality of inner circumferential protrusions include no flat surface.
Claims5
An injection device comprising a screw disposed along a forward and rearward direction including a forward direction in which an injection resin is injected and a rearward direction opposite to the forward direction, and a bush configured to be spline-fitted to the screw, wherein
- the screw includes a plurality of outer peripheral projections formed on an outer peripheral surface on a rear end side of the screw, the outer peripheral projections extending along the forward and rearward direction and being formed at intervals in a circumferential direction of the screw,
- each of the outer peripheral projections is formed with an outer peripheral projection inclined surface and a second outer peripheral projection inclined surface, the outer peripheral projection inclined surface being inclined in a manner so that an outer peripheral projection width along the circumferential direction of the screw becomes smaller toward a rear end of each of the outer peripheral projections, the second outer peripheral projection inclined surface being inclined in a manner so that an outer diameter of the screw becomes smaller toward the rear end of each of the outer peripheral projections,
- the bush includes a through hole extending in the forward and rearward direction, and a plurality of inner peripheral projections formed on an inner peripheral surface of the through hole, the inner peripheral projections extending in the forward and rearward direction and being formed at intervals in a circumferential direction of the through hole,
- each of the inner peripheral projections is formed with an inner peripheral projection inclined surface and a second inner peripheral projection inclined surface, the inner peripheral projection inclined surface being inclined in a manner so that an inner peripheral projection width along the circumferential direction of the through hole becomes smaller toward a front end of each of the inner peripheral projections, the second inner peripheral projection inclined surface being inclined in a manner so that an inner diameter of the bush becomes larger toward the front end of each of the inner peripheral projections, and
- a rear end of each of the outer peripheral projections and a front end of each of the inner peripheral projections include no flat surface.
Dependencies are inferred from the claim text.