JPH0723688Y2 - Rate gyro for model - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a model rate gyro suitable for use in a radio-controlled model helicopter or the like.

(Prior Art) A radio-controlled model helicopter is often equipped with a stability enhancement device using a rate gyro in order to provide stability around the yaw axis, particularly during hovering. This stability enhancer feeds back the angular velocity of the sway of the helicopter about the yaw axis detected by the rate gyro to the servo motor for pitch control of the tail rotor, and automatically controls the pitch of the tail rotor in the direction to stop the sway, It is designed to prevent the nose from swinging to the left and right.

The rate gyro used in such a stability enhancing device is generally supported by a gyro gimbal having a gimbal shaft in the longitudinal direction of the machine body so that the gyro motor is rotatably supported around the axis of the gimbal shaft, and by the motor, The flywheel is designed to be rotated about an axis orthogonal to the gimbal axis.
According to such a rate gyro, when the aircraft swings the nose to the left and right, a rotational moment proportional to the angular velocity of the sway acts on the gimbal due to the gyro precession, so the rotational angle of the gimbal axis must be detected. Thus, the angular velocity around the yaw axis of the airframe can be obtained.

By the way, such a rate gyro flywheel is required to have a large moment of inertia. Therefore, if it is made into a single one, it becomes necessary to make it large, and it becomes difficult to support it. Therefore, in the case of a model rate gyro, its flywheel is divided into two parts, which are attached to both ends of a motor shaft projecting from both end faces of the gyro motor so as to be cantilevered.

Conventionally, the flywheel has been made into a simple disc shape.

(Problems to be solved by the invention) However, in the case of the model rate gyro, the flywheel cannot be brought closer to the end surface of the motor to some extent due to its structure. Therefore, if the flywheel is disc-shaped, a considerably large gap is formed between the flywheel and the motor. Moreover, the motor shaft of the motor used in the model rate gyro is relatively thin.

Therefore, if the helicopter crashes and a strong impact is applied to the gyro, the weight of the flywheel may cause the motor shaft to bend.

The present invention has been made in view of such a problem, and an object thereof is to attach a flywheel to the tip of a motor shaft that largely projects from the end face of the motor while preventing permanent bending of the motor shaft. Is to be done.

(Means for Solving the Problem) In order to achieve this object, the first model rate gyro according to the present invention includes a flywheel, a disc portion facing the end surface of the gyro motor, and the disc portion. It is characterized in that it is formed as a cap-like member that extends from the outer peripheral edge of the motor along the outer peripheral surface of the motor and has a cylindrical portion that covers the outer peripheral surface of the end portion of the motor. The cylindrical portion of the flywheel has an inner diameter slightly larger than the outer diameter of the motor.

Further, the second model rate gyro according to the present invention uses the same disc-shaped flywheel as the conventional flywheel, and instead of the flywheel, the flywheel protruding toward the flywheel is provided on the outer periphery of the motor. The feature is that a wheel regulation member is attached. The flywheel restricting member faces the outer peripheral portion of the flywheel with a small gap.

(Operation) With this configuration, in the case of the first rate gyro, when the motor shaft tries to bend, the cylindrical portion of the flywheel comes into contact with the outer peripheral surface of the motor. Bending is regulated. Further, in the case of the second rate gyro, the motor side surface of the flywheel abuts on the projecting end of the flywheel restricting member, so that further bending of the motor shaft is restricted. Therefore, if the bendable range of the motor shaft is set within its elastic limit, the permanent bending deformation of the motor shaft is reliably prevented.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In the drawings, FIGS. 1 and 2 show a first embodiment of a model rate gyro according to the present invention, FIG. 1 is an exploded perspective view thereof, and FIG. 2 is a vertical sectional front view of the gimbal unit thereof. .

As is apparent from these figures, this model rate gyro 1 includes a gyro gimbal 4 including a cylindrical gimbal ring 2 and a pair of gimbal shafts 3, 3 extending outward from the gimbal ring 2. ing. The gimbal 4
The gimbal shafts 3, 3 are positioned on one diameter of the gimbal ring 2.

A gyro motor 5 having a circular cross section is fitted and fixed to the gimbal ring 2 at the center of the gimbal 4. Both ends of the motor shaft 6 of the motor 5 are projected from both end surfaces of the motor 5 by the same length. Then, when the motor 5 is attached to the gimbal 4, the motor shaft 6 thereof is arranged to be orthogonal to the axis of the gimbal shafts 3, 3.

A pair of flywheels 7, 7 are fixed to both ends of the motor shaft 6. The flywheel 7
A cap-shaped member including a disc portion 7a facing the end surface of the motor 5 and a cylindrical portion 7b extending from the outer peripheral edge of the disc portion 7a toward the center side of the motor 5 in parallel with the motor shaft 6. Has been done. The inner diameter of the cylindrical portion 7b is made slightly larger than the outer diameter of the motor 5. The length of the cylindrical portion 7b is
When the flywheel 7 is attached to the motor shaft 6, the flywheel 7 reaches a length near the center of the motor 5. In this way, the motor 5 is covered by the cylindrical portion 7b of the flywheel 7 attached to the motor shaft 6 at the outer peripheral surface of the end portion with a small gap.

Then, the motor 5 is attached to the gimbal 4 in this way,
By attaching flywheels 7, 7 to the motor shaft 6, a gimbal unit 8 is formed. The gimbal unit 8 is rotatably supported around the axis of the gimbal shafts 3,3 by a casing 10 forming a frame via bearings 9,9 mounted on the gimbal shafts 3,3. There is.

In the rate gyro 1 configured as described above, when the motor 5 is operated, the flywheels 7, 7 fixed to both ends of the motor shaft 6 are rotationally driven. When an external force acts on the flywheels 7,7 in that state, the flywheels 7,7 tilt in a direction orthogonal to the external force due to the gyro precession. Therefore, if the gimbal shafts 3, 3 are installed in the helicopter so that the axes of the gimbal shafts 3 and 3 are in the longitudinal direction of the machine body, the angular velocity about the yaw axis of the machine body can be detected by the rotation angle of the gimbal shaft 3.

When a strong impact is applied to the gyro 1 such as when the helicopter crashes, the inertial force of the flywheels 7, 7 in the impact direction causes the motor shaft 6 to bend. However, at that time, as shown in FIG. 3, the inner peripheral surface of the cylindrical portion 7b of the flywheel 7 engages with the outer peripheral surface of the motor 5, so that further bending of the motor shaft 6 is prevented. . Cylindrical part of the flywheel 7 on the outer peripheral surface of the motor 5
Since the space between the inner peripheral surface of 7b and the inner peripheral surface is small, the bending of the motor shaft 6 until they are engaged is small. Therefore, the bending of the motor shaft 6 is suppressed within the elastic limit, and when the external force disappears, the elasticity causes the motor shaft 6 to return to its original state. In this way, the permanent deformation of the motor shaft 6 is prevented.

Since the flywheel 7 is cap-shaped in this way, the mass of the flywheel 7 is concentrated on the outer peripheral portion thereof, so that the rotational moment of inertia about the motor shaft 6 can be increased. Therefore, the disk portion 7a of the flywheel 7 can be made thin, and the gimbal unit 8 can be made compact. Further, since the center of gravity of the flywheels 7, 7 approaches the axis of the gimbal shaft 3, the moment of inertia around the gimbal shaft 3 becomes small. Therefore, the responsiveness at the time of detecting the angular velocity is improved, and a sensitive rate gyro can be obtained.

FIG. 4 is a cutaway front view of a gimbal unit showing a second embodiment of the model rate gyro according to the present invention.
In this embodiment, the portions corresponding to those of the embodiment of FIGS. 1 and 2 are designated by the same reference numerals, and the duplicated description will be omitted.

In the case of this rate gyro 1, the flywheels 7, 7 attached to both ends of the motor shaft 6 are disc-shaped like the conventional ones. The width of the gimbal ring 2 to which the motor 5 is fitted and fixed is made larger than the length of the motor 5, and both ends 2a, 2a of the gimbal ring 2 project toward the flywheel 7, 7 side from the both ends of the motor 5. ing. The end surface of the gimbal ring 2 has a flywheel 7
It is said that they are opposed to each other with a small interval on the outer peripheral portion of.

Also in the rate gyro 1 configured in this way, when the motor shaft 6 tries to bend, the outer peripheral portion of the flywheel 7 contacts the end surface of the gimbal ring 2, so that further bending of the motor shaft 6 is restricted. . Therefore, by reducing the distance between the end surface of the gimbal ring 2 and the flywheel 7, the bending of the motor shaft 6 can be suppressed within the elastic limit, and the permanent deformation of the motor shaft 6 can be prevented. .

In this embodiment, the end portion 2a of the gimbal ring 2 serves as a flywheel regulating member according to the present invention. However, the flywheel restricting member may be a member different from the gimbal ring 2. In that case,
The flywheel restricting member may be a plurality of members mounted along the outer peripheral surface of the motor 5 at intervals in the circumferential direction.

As described above, since the rate gyro 1 according to the present invention is surely prevented from bending the motor shaft 6, it is particularly effective when used in a model aircraft such as a model helicopter that often crashes. However, the present invention is not limited to this, and it will be apparent that it is also useful as a general model rate gyro.

(Effect of the Invention) As is clear from the above description, according to the present invention, when the motor shaft is about to bend, the flywheel attached to the motor shaft is the motor or the flywheel restricting member attached to the motor. Since the bending of the motor shaft is restricted by abutting against the motor shaft, the bending of the motor shaft can be suppressed to be small even if the flywheel is arranged far away from the end surface of the motor. Therefore, the bending of the motor shaft can be kept within the elastic limit, and the permanent bending of the motor shaft can be prevented. In this way, the model rate gyro having excellent impact resistance can be obtained.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of essential parts showing a first embodiment of a model rate gyro according to the present invention, FIG. 2 is a cutaway front view showing a gimbal unit of the rate gyro, and FIG. FIG. 4 is an explanatory view for explaining the action of the rate gyro, and FIG. 4 is a cutaway front view of a gimbal unit showing a second example of the model rate gyro according to the present invention. 1 ...... Rate gyro for model 2 ...... Gimbal ring 2a ...... End (flywheel regulation member) 3 ...... Gimbal axis 4 ...... Gyro gimbal 5 ...... Gyro motor, 6 ...... motor axis 7 ...... Flywheel , 7a …… Disc part 7b …… Cylindrical part 8 …… Gimbal unit 10 …… Casing (frame)

Claims (2)

[Scope of utility model registration request] 1. A gyro gimbal having a gimbal shaft, which is rotatably supported by a frame around the axis of the gimbal shaft, and a motor shaft projecting from both end surfaces, the motor shaft of the gimbal shaft. In a rate gyro including a gyro motor fixed to the gimbal so as to be orthogonal to the axis, and a flywheel fixed to the tip of the motor shaft and rotationally driven by the motor; A cap composed of a disk portion facing the end surface of the motor, and a cylindrical portion extending from the outer peripheral edge of the disk portion along the outer peripheral surface of the motor and covering the outer peripheral surface of the motor end at a small interval. A model-shaped rate gyro that is said to be shaped like a shape. 2. A gyro gimbal having a gimbal shaft, which is rotatably supported by a frame around the axis of the gimbal shaft, and a motor shaft projecting from both end surfaces, the motor shaft of the gimbal shaft. A gyro motor fixed to the gimbal so as to be orthogonal to the axis, and a flywheel fixed to the tip of the motor shaft and rotationally driven by the motor, wherein the flywheel includes: A disk-shaped member that faces the end surface of the motor is mounted on the outer circumference of the motor. A flywheel restricting member that protrudes from the end surface of the motor and that faces the outer peripheral portion of the flywheel at small intervals is attached. , Rate gyro for model.