Unmanned helicopter
First Claim
Patent Images
1. An unmanned helicopter comprising:
- a drive source;
a tail rotor;
a shaft unit that transmits a driving force from the drive source to the tail rotor;
an elastic member disposed in the shaft unit;
a bearing; and
a tail body;
whereinthe shaft unit includes a drive shaft, a transmission that transmits a driving force from the drive source to the drive shaft, and a transmittal portion that transmits a rotation torque from the drive shaft to the tail rotor;
the elastic member is interposed in the shaft unit between the transmission and the transmittal portion;
the bearing does not include an inner ring and is disposed around an outer circumference of the drive shaft in direct contact with the drive shaft; and
the tail body covers the drive shaft and supports the drive shaft via the bearing.
1 Assignment
0 Petitions
Accused Products
Abstract
An unmanned helicopter includes a drive source, a tail rotor, a shaft unit that transmits a drive force from the drive source to the tail rotor, and an elastic member. The shaft unit includes a drive shaft, a transmission which transmits a drive force from the drive source to the drive shaft, and a transmittal portion that transmits a rotation torque from the drive shaft to the tail rotor. The drive shaft includes a first shaft portion and a second shaft portion. The elastic member is located between the first shaft portion and the second shaft portion.
10 Citations
7 Claims
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1. An unmanned helicopter comprising:
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a drive source; a tail rotor; a shaft unit that transmits a driving force from the drive source to the tail rotor; an elastic member disposed in the shaft unit; a bearing; and a tail body;
whereinthe shaft unit includes a drive shaft, a transmission that transmits a driving force from the drive source to the drive shaft, and a transmittal portion that transmits a rotation torque from the drive shaft to the tail rotor; the elastic member is interposed in the shaft unit between the transmission and the transmittal portion; the bearing does not include an inner ring and is disposed around an outer circumference of the drive shaft in direct contact with the drive shaft; and the tail body covers the drive shaft and supports the drive shaft via the bearing. - View Dependent Claims (2)
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3. An unmanned helicopter comprising:
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a drive source; a tail rotor; a shaft unit that transmits a driving force from the drive source to the tail rotor; and an elastic member disposed in the shaft unit;
whereinthe shaft unit includes a drive shaft, a transmission that transmits a driving force from the drive source to the drive shaft, and a transmittal portion that transmits a rotation torque from the drive shaft to the tail rotor; the elastic member is interposed in the shaft unit between the transmission and the transmittal portion; and the elastic member has a relationship between a displacement amount of the elastic member and a rotation torque outputted from the elastic member such that, as the displacement amount increases, the rotation torque increases toward a predetermined value in an asymptotic manner.
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4. An unmanned helicopter comprising:
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a drive source; a tail rotor; a shaft unit that transmits a driving force from the drive source to the tail rotor; and an elastic member disposed in the shaft unit;
whereinthe shaft unit includes a drive shaft, a transmission that transmits a driving force from the drive source to the drive shaft, and a transmittal portion that transmits a rotation torque from the drive shaft to the tail rotor; the elastic member is interposed in the shaft unit between the transmission and the transmittal portion; and the drive shaft includes a first shaft portion and a second shaft portion, and the elastic member is located between the first shaft portion and the second shaft portion. - View Dependent Claims (5, 6, 7)
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Specification