Combination torsion spring, and shift mechanism provided with same

摘要

A combination torsion spring is configured such that a predetermined reaction force is generated in a coil circumferential direction without a center of a wound coil tilting even when applied with a load. A first torsion spring and a second torsion spring of the combination torsion spring are each provided with a coil. Each coil is formed by spirally winding a copper wire in a different winding direction from one another. The inner diameter of the coil of the first torsion spring is approximately the same as the outer diameter of the coil of the second torsion spring. In the combination torsion spring, the coil of the second torsion spring is inserted into the coil of the first torsion spring.

主权项

1. A combination torsion spring comprising:
a first torsion spring and a second torsion spring each including a coil section and a first hook section and a second hook section provided at ends of the coil section; wherein the first torsion spring and the second torsion spring are arranged so that directions in which the coil sections are wound in a helical shape are different to each other, and an inner diameter of the coil section of the first torsion spring is approximately equal to an outer diameter of the coil section of the second torsion spring; the coil section of the second torsion spring is inserted into an inside of the coil section of the first torsion spring; a set of the first hook section of the first torsion spring and the first hook section of the second torsion spring and a set of the second hook section of the first torsion spring and the second hook section of the second torsion spring are positioned at positions that sandwich the coil sections; the first hook section of the first torsion spring and the first hook section of the second torsion spring are engaged with one of a pair of action members, the pair of action members mutually transmitting torque via the first torsion spring and the second torsion spring; the second hook section of the first torsion spring and the second hook section of the second torsion spring are engaged with another one of the pair of action members; and a change direction of a coiling diameter of the coil section of the first torsion spring by deflection of the first torsion spring is equal to a change direction of a coiling diameter of the coil section of the second torsion spring by deflection of the second torsion spring when one of the pair of action members is rotated relatively to the another one of the pair of action members, the change direction of the coiling diameter being the direction that the coiling diameter is expanded or reduced.