Leaf-cartwheel flexure, and mounting systems and methods utilizing same
View Patent ↗A leaf-cartwheel flexure for coupling an object to a frame includes a leaf flexure for mounting to an object and a cartwheel hinge for mounting to the frame. The leaf flexure defines an axis of contraflexure and the cartwheel hinge is bendable about a rotational axis. The cartwheel hinge is coupled to the leaf flexure and positioned such that the rotational axis substantially aligns with the axis of contraflexure. A system and a method for mounting a component utilize three such leaf-cartwheel flexures for mounting the component to a frame, in which the flexures are approximately equidistant from each other about the component.
1. A leaf-cartwheel flexure for coupling an object to a frame, comprising
a rigid base that is configured for mounting to an object;
a leaf flexure having a first end and a second end, the first end coupling with the base, the leaf flexure defining an axis of contraflexure between the first end and the second end;
a rigid brace that couples with the second end of the leaf flexure;
a cartwheel hinge having first, second, third and fourth members that join at and are bendable about a rotational axis that perpendicularly intersects the axis of contraflexure; the first and second members of the cartwheel hinge coupling with the brace, and
a rigid mounting fixture that couples with the third and fourth members of the cartwheel hinge.
2. Leaf-cartwheel flexure of claim 1 wherein the leaf flexure and the cartwheel hinge are formed from a single, monolithic piece of material.
3. Leaf-cartwheel flexure of claim 2 wherein the material is one of titanium and stainless steel.
4. Leaf-cartwheel flexure of claim 2 wherein at least one of the leaf flexure and the cartwheel hinge are formed utilizing wire electro-discharge machining.
5. Leaf-cartwheel flexure of claim 4 wherein coarse features of at least one of the leaf flexure and the cartwheel hinge are formed mechanically before utilizing the wire electro-discharge machining.
6. Leaf-cartwheel flexure of claim 4 wherein the leaf flexure forms an opening to facilitate wire electro-discharge machining that forms the cartwheel hinge.
7. Leaf-cartwheel flexure of claim 1 wherein the leaf flexure and the cartwheel hinge are formed of different materials.
8. Leaf-cartwheel flexure of claim 1 wherein spring coefficients of the leaf flexure and the cartwheel hinge are optimized so that a system utilizing three of the flexure elements to mount a component may be characterized by a stiffness matrix having diagonal coefficients that are at least 500 times the value of each other coefficient of the matrix in the same row or column as the diagonal coefficient.
9. A system for mounting a component to a frame, comprising
a plurality of flexure elements positioned equidistantly about the component, each of the flexure elements having
a rigid base that is configured for mounting to an object;
a leaf flexure having a first end and a second end, the first end coupling with the base, the leaf flexure defining an axis of contraflexure between the first end and the second end;
a rigid brace that couples with the second end of the leaf flexure;
a cartwheel hinge having first, second, third and fourth members that join at and are bendable about a rotational axis; that perpendicularly intersects the axis of contraflexure; the first and second members of the cartwheel hinge coupling with the brace, and
a rigid mounting fixture that couples with the third and fourth members of the cartwheel hinge.
10. System of claim 9 wherein spring coefficients of the leaf flexure and the cartwheel hinge are optimized so that the system is characterized by a stiffness matrix having diagonal coefficients that are at least 500 times the value of each other coefficient of the matrix in the same row or column as the diagonal coefficient.
11. System of claim 9 , further comprising means for independently adjusting a distance of each flexure element from the frame.
12. A system for mounting a component to a frame, comprising
a plurality of flexure elements positioned equidistantly about the component, each of the flexure elements having
a leaf flexure for mounting to the component, the leaf flexure defining an axis of contraflexure; and
a cartwheel hinge for mounting to the frame, the cartwheel hinge bendable about a rotational axis;
the cartwheel hinge being operatively coupled to the leaf flexure and positioned such that the rotational axis substantially aligns with the axis of contraflexure, and
means for independently adjusting a distance of each flexure element from the frame, wherein the means for independently adjusting a distance of each flexure element from the frame comprises an adjusting screw.
13. System of claim 12 , wherein the means for independently adjusting a distance of each flexure element from the frame further comprises a locknut and guide rod that cooperate with the adjusting screw to maintain an orientation of the flexure element relative to the frame.
14. System of claim 13 , the guide rod being oriented perpendicularly with respect to the frame, and a mounting fixture of the flexure element being secured to the locknut, such that the locknut slides over the guide rod as the adjusting screw moves the locknut perpendicularly with respect to the frame.
15. System of claim 9 , wherein the rotational axes of the cartwheel hinges intersect at a center of mass of the component.