Patent ID: 7784373
Filing Date: 2010-08-31
Classification: F16H,Y10T

Abstract:
1. A load sensing drive force transmission device comprising: a male screw member rotatably driven by a drive source; a female screw member having an effective diameter set to be larger than that of said male screw member, and which is screw engaged with said male screw member in a state where an axis of said female screw member is offset with respect to an axis of said male screw member, and wherein said female screw member is movable in an axial direction by rotation of said male screw member; an inner race connected to said female screw member and an outer race disposed radially outside of and concentric with said inner race, with first bearing members disposed between said inner race and said outer race, wherein said female screw member is rotatably supported on said transmission member through said first bearing members; a transmission member that transmits a drive force generated by axial movement of said female screw member to an object; a clamp connected to said transmission member for clamping said object; and frictional means connected to said transmission member in a state enabling rotation of said female screw member, which by abutment against said inner race prevents rotation of said female screw member in two directions when a load from said object applied through said clamp with respect to said drive force is at or below a predetermined value, and which progressively enables greater rotation of said female screw member in two directions as said load increases further in excess of said predetermined value, wherein said frictional means remains operatively coupled to said female screw member at all times including when said female screw member rotates.