Rotor blade
AssigneeNtn Corporation
InventorMasahiko Suzuki
Life of this patent
Estimating the term…
Abstract
A lift type rotor blade which has a chord length gradually increased from a blade root to a maximum chord length portion being a base portion of a blade end portion, includes a leading edge, a front surface and an inclined portion formed on the blade end portion. The leading edge has a maximum thickness that is the maximum at the blade root and is gradually and continuously decreased from the blade root to a tip portion via the maximum chord length portion in a side view. The front surface is gradually inclined in a direction of a back surface from the blade root to the maximum chord length portion such that an interval between the front and back surfaces is continuously decreased. The inclined portion is inclined in a front surface direction from the maximum chord length portion.
Claims9
A lift type rotor blade which has a chord length gradually increased from a blade root to a maximum chord length portion, the maximum chord length portion is a base portion of a blade end portion, the lift type rotor blade comprising:
- a leading edge that faces a direction of rotation and extends from the blade root to a tip portion of the blade end portion, and, in a side view, the leading edge has a thickness that is greatest at the blade root and gradually and continuously decreases from the blade root to the tip portion;
- a front surface gradually inclined in a direction of a back surface from the blade root to the maximum chord length portion such that an interval between the front and back surfaces is continuously decreased from the blade root to the maximum chord length portion in the side view;
- and
- an inclined portion formed on the blade end portion which is inclined in a front surface direction from the maximum chord length portion,
- wherein the back surface is gradually inclined in a direction toward the front surface from the blade root to the maximum chord length portion according to the continuous decrease of the interval between the front and back surfaces from the blade root to the maximum chord length portion in the side view,
- wherein the front surface extends from the leading edge to a trailing edge of the rotor blade, the trailing edge being positioned behind the leading edge in the direction of rotation, the front surface is oriented, at the blade root, in an oblique direction relative to the direction of rotation such that, from the leading edge to the trailing edge, the front surface is angled toward the back surface, and from the blade root to the maximum chord length portion, a crossing angle of an orientation direction of the front surface relative to the direction of rotation gradually decreases, and
- wherein when the lift type rotor blade fixed to a hub of a rotor rotates, an airflow is directed from the blade root to the maximum chord length portion at where an air pressure is decreased.
Dependencies are inferred from the claim text.