US 2010/0144450 A1Published application

Power transmission

OwnerKazuhiko Takai, Sueji Hirawatari +1inventors

InventorsKazuhiko Takai, Sueji Hirawatari, Toshiki Fukasawa

Life of this patent

Estimating the term…

Loading patent…

Abstract

A power transmission device having a coupling portion of a driven body and a drive body constituted by combining a positive torque transmission member for transmitting torque in forward rotational direction but interrupting transmission of torque from the drive body by breaking itself when the drive load of the driven body exceeds a predetermined level, with a separate negative torque transmission member for transmitting torque in reverse rotational direction is further provided with a means for generating pretension in the positive torque transmission member in the pulling direction and simultaneously generating a pretension in the negative torque transmission member in the compressing direction after both torque transmission members are combined. A highly reliable power transmission device which can impart a desired pretension precisely and conveniently, and can interrupt torque properly by suppressing fatigue of material at the coupling portion can be provided.

Claims9

Dependent claims

A power transmission in which a driven body and a drive body for driving said driven body are rotated in the same direction and are coupled through a coupling portion, torque of said drive body is transmitted to said driven body, transmission of torque from said drive body is interrupted when a drive load of said driven body exceeds a predetermined level, and said coupling portion is constituted by combining members different from each other of a positive torque transmission member for transmitting torque in a forward rotational direction and interrupting transmission of torque from said drive body by its own fracture when said drive load of said driven body exceeds said predetermined level and a negative torque transmission member capable of transmitting torque in a reverse rotational direction, characterized in that a pretension generating means is provided for simultaneously generating pretensions in directions opposite to each other of a pretension in said positive torque transmission member in a tensile direction and a pretension in said negative torque transmission member in a compressive direction after said positive torque transmission member and said negative torque transmission member are combined.

Dependencies are inferred from the claim text.