JPH0633366Y2 - Vibrating gyro - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a vibrating gyro.

[Prior Art] A vibrating gyro imparts a velocity by vibrating an object based on the principle that "Coriolis force is generated when an angular velocity is applied to an object having velocity", and the angular velocity is applied to this object. The force of Coriolis that occurs sometimes is detected as the displacement of the object,
The angular velocity applied to the object is detected. This vibrating gyro has a longer life compared to the conventional general rate gyro that utilizes the angular momentum of the rotating body because it has no wear parts such as bearings. It has a piezoelectric element for driving and detecting as described below. It has features such as low power consumption because it is used.

An object that applies vibration in the vibrating gyro, that is,
Examples of the shape of the vibrator include tuning fork type and H type. FIG. 6 shows an H type conventional vibration gyro. This vibrating gyro 1 has a support bar 3 penetrating through the center of an H-shaped vibrator 2 and integrally fixed, and both ends of this support bar 3 are fixed to a cylindrical casing 4. Piezoelectric driving elements 5 are attached to the four lower parts on both side surfaces 2a in the width direction of the device. On the other hand, on the left, right, upside and downside 4 of the surface 2b in the vibrator thickness direction perpendicular to the surface to which the driving piezoelectric elements 5 are attached. This is a structure in which a piezoelectric element 6 for detection, which is paired with each piezoelectric element 5 for driving, is attached to a location. In the conventional vibrating gyro 1, as shown in the figure, the support rod 3 supporting the vibrator 2 is directly fixed to the casing 4.

[Problems to be Solved by the Invention] The above vibration gyro is mounted on, for example, an automobile and used for detecting the movement of the vehicle body when the vehicle body is controlled. However, under severe installation conditions, it is not possible to distinguish between the vibration due to the vibration gyro itself and the external vibration noise, so that there is a problem in that the external vibration noise affects the detection signal, causing a malfunction.

It is an object of the present invention to solve the above-mentioned conventional problems and to obtain a vibration gyro that is less affected by external vibration noise and can perform accurate angular velocity detection even in a severe vibration environment.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a damping material in which both ends of a support rod for supporting a vibrator are joined with a metal material and a non-metal material. It was fixed to the casing via.

[Operation] In the above configuration, since the support rod is supported by the casing via the damping material, even if the casing vibrates due to external vibration, the vibration transmitted to the support rod is attenuated by the damping material and reduced. The external vibration noise applied to the vibrator supported by this support rod is reduced. This enables accurate angular velocity detection with a small error even when installed in a place with a severe vibration environment.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

1 to 5 show the first embodiment, FIG. 1 is a partially cutaway perspective view of the vibration gyro 10, FIG. 2 is a plan view of the same, and FIG. 3 is a sectional view taken along line III-III in FIG. 4 and FIG. 4 are sectional views taken along the line IV-IV in FIG. In each drawing, an H-shaped vibrator 2, a support rod 3 penetratingly fixed to the center of the vibrator 2,
A driving piezoelectric element 5 attached to the vibrator 2, and
The detection piezoelectric element 6 is the same as the conventional piezoelectric element shown in FIG.

In the first embodiment of the present invention, the supporting rod 3 is made of metal material 11a, 12a and non-metal material as shown in an enlarged view in FIG.
For example, it is fixed to the casing 13 via damping materials 11 and 12 which are composite materials formed by joining synthetic resins 11b and 12b. In this embodiment, each of the damping materials 11 and 12 has an annular shape, and is interposed and joined between the casing upper portion 14 and the casing lower portion 15 to form a part of the cylindrical casing 13. . Further, grooves 11c and 12c for fitting the support rod 3 are provided at the joints between the both damping materials 11 and 12, and the support rods 3 are sandwiched in the grooves 11c and 12c to be integrally joined.

The operation of the vibration gyro 10 having the above structure will be described. When a voltage is applied to the driving piezoelectric element 5, the vibrator 2 vibrates in the arrow (a) direction. When an angular velocity due to rotation in a plane orthogonal to the cylinder center of the casing 13 is applied to the vibrating gyro 10, a Coriolis force in the arrow (b) direction is generated in the vibrator 2. Due to the Coriolis force, the vibrator 2 is flexibly deformed, and the flexural deformation causes a voltage to be generated in the detection piezoelectric element 6.
Thus, from the detection voltage signal from the detection piezoelectric element 6,
The flexural deformation of the vibrator 2 is detected, the Coriolis force applied to the vibrator 2 is detected from the flexural deformation, and the angular velocity applied to the vibrating gyro is detected from the Coriolis force. In addition, the rotation angle is calculated by integrating the angular velocity.

In the above operation, when the vibrating gyro 10 is installed in, for example, an automobile, the casing 13 attached to the vehicle vibrates due to the vibration of the vehicle body.
Since it is supported by the casing 13 via 1 and 12, even if the casing 13 vibrates due to external vibration, the vibration transmitted to the support rod 3 is absorbed by the damping materials 11 and 12 to a low level. External vibration noise applied to the vibrator 2 supported by the support rod 3 is reduced. As a result, the natural frequency of the vibrator 2 is not affected by the external vibration, the error is reduced, and the accurate angular velocity detection is possible.

In addition, in the present invention, as the non-metal material which is one component of the vibration damping material, a material having a cushioning action other than the synthetic resin can be appropriately used.

As described above, according to the present invention, the cylindrical casing, the vibrator housed in the casing, and the vibrator extending from the vibrator are
A support rod joined to the casing, the casing is divided into an upper part and a lower part, and between the upper part and the lower part,
It consists of a structure in which a damping material made by joining a ring-shaped metallic material and a non-metallic material is interposed and joined, and both ends of a support rod that supports the vibrator are joined with the metallic material and the non-metallic material. Since it is fixed to the casing via the damping material, it is possible to reduce the external vibration noise transmitted from the casing to the vibrator via the support rod, and this makes it possible to install it even in a severe vibration environment. , It became possible to detect the angular velocity accurately with little error.

[Brief description of drawings]

1 is a partially cutaway perspective view of a vibrating gyroscope showing an embodiment of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a sectional view taken along line III-III in FIG. 2, and FIG. 2 is a sectional view taken along line IV-IV in FIG. 2, FIG. 5 is an enlarged perspective view of the vicinity of the end portion of the support rod, and FIG. 6 is a partially cutaway perspective view showing a conventional vibrating gyro. 2 ... Oscillator, 3 ... Support rod, 11,12,20 ... Damping material, 11a, 12a, 20a ... Metal material, 11b, 12b, 20b ... Synthetic resin (non-metal material), 13, 21 …… Casing.

Claims (1)

[Scope of utility model registration request] 1. A cylindrical casing, a vibrator housed in the casing, and a support rod extending from the vibrator and joined to the casing. The casing is divided into an upper portion and a lower portion, and an upper portion thereof. And a lower portion, a damping material formed by joining a ring-shaped metallic material and a non-metallic material is interposed and joined, and both ends of the support rod are made of the metallic material of the damping material. And a vibration gyro, which is sandwiched and supported by a non-metallic material.