JPS6215410A - Vibration type angular velocity detecting instrument - Google Patents

Abstract

PURPOSE:To facilitate a fitting work by simplifying the fitting structure of a vibration body forming two vibration pieces vibrating in the vibration direction of a mobile both with a simple vibration piece and by supporting the center part thereof to the mobile body with an elastic pin. CONSTITUTION:Two vibration pieces 22b and 22c vibrating in the vibration direction of a mobile body 10 are formed at both sides of the center part 22a of a single vibration piece 22 by supporting it with an elastic pin 21 to the mobile body 10 in the vibration mechanism 20 for detecting angular velocity combining two vibration pieces vibrating in the vibration direction of the mobile body 10 and the separated two vibration pieces vibrating in the right angles direction with those vibration pieces at the time when an angular velocity is caused on the mobile body 10. Separated vibration pieces 23, 24 are fitted as well so as to intersect at right angles at these tips. The piezoelectric elements 25-28 for deflection detection are fitted then to respective vibration piece 22b, 22c, 23, 24. The fitting of the vibration mechanism 20 to the mobile body 10 is thus simplified.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a vibration type angular velocity detection device.

[Prior art]

Conventionally, this type of vibration type angular velocity detection device uses a first vibrating piece that vibrates in the vibration direction of a movable body such as a moving body or a rotating body, as disclosed in Japanese Patent Laid-Open No. 59-217166, for example. and a second vibrating piece that extends from the first vibrating piece and vibrates in a direction perpendicular to the first vibrating piece when an angular velocity is generated in the movable body; A third vibrating piece that vibrates, and a fourth vibrating piece that extends from the third vibrating piece in parallel to the second vibrating piece and vibrates in a right angle direction when an angular velocity is generated in the movable body. a first piezoelectric element that is fixed to the first vibrating piece so as to be distorted in the vibration direction thereof and performs a piezoelectric conversion action; and a first piezoelectric element that is fixed to the second vibrating piece so as to be distorted in the vibration direction and performs a piezoelectric conversion action. a third piezoelectric element fixed to the third vibrating piece so as to be distorted in a phase direction opposite to the vibration direction of the first vibrating piece and performing a piezoelectric conversion action;
There is a device that is provided with a fourth piezoelectric element that is fixed to the fourth vibrating piece so as to be distorted in the vibration direction and performs a piezoelectric conversion action.

However, in such a configuration, when attaching the first and third vibrating pieces to the movable body, each base of the first and third vibrating pieces is attached to a metal base fixed to a part of the movable body. Since the ends are fixed by welding, soldering, etc., the fixing work is troublesome, and the degree of fixation varies and decreases, leading to deterioration of the detection characteristics of the angular velocity detection device. . Furthermore, since the two series of metal bases are made up of a plurality of parts, there is a problem in that the fixing work becomes complicated, further accelerating the above-mentioned problems.

Therefore, in order to cope with these problems, the present invention attempts to simplify the mounting structure of both derivative bodies to the movable body in the vibration type angular velocity detection device as described above.

[Means for solving problems]

In solving this problem, the structural features of the present invention are as follows:
It has a first vibrating piece that vibrates in the vibration direction of the movable body, and a second vibrating piece that extends from the first vibrating piece and vibrates in a direction perpendicular to the first vibrating piece when an angular velocity is generated in the movable body. a vibrating body; a third vibrating piece that vibrates in the vibration direction of the movable body; and a third vibrating piece that extends from the third vibrating piece in parallel to the second vibrating piece, and when an angular velocity is generated in the movable body, the third vibrating piece vibrates. a vibrating body having a fourth vibrating piece that vibrates in the orthogonal direction; a first piezoelectric element that is fixed to the first vibrating piece so as to be distorted in the vibration direction thereof and performs a piezoelectric conversion action; and the second vibrating piece. a second piezoelectric element that is fixed to be distorted in the vibration direction thereof and performs a piezoelectric conversion action; and a second piezoelectric element that is fixed to the third vibrating element so as to be distorted in a phase direction opposite to the vibration direction of the first vibration piece and performs a piezoelectric conversion action. and a fourth piezoelectric element that is fixed to the fourth vibrating piece so as to be distorted in the vibration direction thereof and performs a piezoelectric conversion action. The single vibrating piece is formed by a single vibrating piece, the central part of the single vibrating piece is supported by a part of the movable body by an elastic pin, and the first and third piezoelectric elements are attached to the single vibrating piece. The reason is that it is fixed on both sides of the central part.

[Effect]

By configuring the present invention in this way, the above-mentioned first. The structure of this kind of angular velocity detection device is
The mounting structure and the mounting work for the movable body eave are significantly simplified.

〔Example〕

Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an example of a vibration type angular velocity vibration detection device according to the present invention. This angular velocity detection device includes a metal substrate 10 vertically fixed to a part of a vehicle body, and a metal substrate 10 fixed to a part of a vehicle body.
The vibration mechanism 20 is equipped with a vibration mechanism 20 assembled to the vibration mechanism 20.
is composed of a metal pin 21, three diaphragms 22, 23, 24, and four piezoelectric elements 25, 26, 27, 28. The metal pin 21 is connected to the metal substrate 10 at its base end.
The same metal base F is fitted by welding, soldering, etc. to the center part of
j, extends horizontally from 10 toward the rear of the vehicle.

The diaphragm 22 is made by bending a band-shaped metal plate into a U-shape so that it has a base 22a and two derivative parts 22b and 22c extending in parallel from both ends of the base 22a and facing each other at right angles to the base 22a. It is formed as follows. In such a case, the base 22a is attached vertically to the tip of the metal pin 22a at its central portion so that both the derivative parts 22b and 22c are located vertically and extend horizontally toward the rear of the vehicle. Both driving parts 22b and 22c are fitted by welding, soldering, etc.

The top and bottom surfaces of are horizontal.

The circular diaphragms 23 and 24 are formed from short II-shaped metal plates, and a cutout groove 23a is provided at the center of each base of each of these diaphragms 23 and 24 along the longitudinal direction of each diaphragm 23 and 24.
, 24a are drilled in each case. Thus, the diaphragm 23 has a cutout groove 23a so that the diaphragm 23 extends in the same direction as the oscillating section 22b with its left and right surfaces perpendicular to both the upper and lower surfaces of the oscillating section 22b of the diaphragm 22. The diaphragm 24 is attached to the tip by welding, soldering, etc., and the diaphragm 24 extends parallel to the diaphragm 23 with its left and right surfaces perpendicular to the top and bottom surfaces of the vibrating portion 22C of the diaphragm 22. The notch groove 24a is fitted into the central portion of the tip of the vibrating portion 22c by welding, soldering, or the like. In such a case, the circular diaphragms 23, 24 are both located in the same vertical plane.

The piezoelectric element 25 is attached to the upper surface of the vibrating part 22b of the diaphragm 22 with its negative electrode, and its piezoelectric conversion action causes the vibrating piece 22b to reach a predetermined resonance frequency in the vertical direction (i.e., the X direction). While the piezoelectric element 26 is vibrated, the -
The side electrode is attached to the lower surface of the vibrating part 22c of the diaphragm 22, and its piezoelectric conversion action causes the vibrating part 22C to vibrate in the vertical direction (ie, the X direction) at a predetermined resonance frequency.

In addition, the negative side electrodes of both piezoelectric elements 27 and 28 are attached to the right (11+l) 111 side of each of the three swing pieces 23.24.Thus, the piezoelectric conversion effect of each piezoelectric element 25.26 Under the vibration of each vibrating part 22b, 22C in the X direction based on The angular velocity ω is detected by performing a piezoelectric conversion action on the angular velocity ω.In FIG. 1, each symbol #I, #2.β3.
Reference numeral 14 indicates the connecting wires of each piezoelectric element 25, 26, 27, and 28, respectively. In addition, code 10aD connecting conductor β1,
12 guide tubes are shown, and the --- arrow mark 101) shows the guide tube of the reconnection conducting wire A3゜n4.

In this embodiment configured as described above, in order to assemble the device of the present invention to a part of the body of the vehicle, the diaphragm 22, which is formed by bending a single metal plate into a U-shape, is attached to the diaphragm 22. Since it is only necessary to support a part of the vehicle body via the metal substrate 10 using the central Q trowel metal pin 21 of the substrate 22a, this type of angular velocity detection device can be easily assembled to the vehicle body with minimum man-hours and accuracy. As a result, the detection accuracy of the angular velocity detection device can be maintained at a high level without any installation errors. In this case, since the re-vibrating parts 22b and 22C are formed by bending a single metal plate as described above, the structure of the vibrating mechanism 20 becomes much simpler than in the conventional case.

Next, a modification of the first embodiment will be explained with reference to FIG. 2. In this modification, a vibration mechanism 30 is adopted in place of the vibration mechanism 20 described in the first embodiment. has its compositional characteristics. The vibration mechanism 30 includes three vibration plates Fj, 22, 23 .
24 (see FIGS. 2 and 3), this diaphragm 31 has a base 22a, both vibrating parts 22b, 22c and Base portion 3Ia corresponding to circular diaphragms 23' and 24, respectively
, re-vibration parts 31b, 31C and re-vibration parts 31d, 31e
It is formed by bending a single metal plate in the form of a bent belt punched into the shape shown in FIG. 3 and bent as shown in FIG. Note that the other configurations are the same as those of the first embodiment.

Therefore, in this modified example configured in this way, the metal pin 21 is formed by a single diaphragm 31 formed by bending a punched metal plate into the shape shown in FIG. 2 as shown in FIG. The base 31a9 is fixed to both vibrating parts 22b, 2
Re-vibration portions 31b and 31C corresponding to 2C, respectively, and re-vibration portion 31d corresponding to circular diaphragm 23°24, respectively;
31e can be integrally configured, each vibration plate 2 for each vibration part 22b, 22b as in the first embodiment
The fitting work of 3.24 becomes unnecessary, and as a result, the work of manufacturing the vibration mechanism of this type of angular velocity detection device can be easily and accurately performed.

FIG. 4 shows a second embodiment of the present invention, and the angular velocity detection device in this embodiment includes a metal substrate 40 vertically fixed to a part of the body of a vehicle, and a metal substrate 40 assembled to the metal substrate 40. A vibration mechanism 50 is provided. The vibration mechanism 50 is composed of a metal pin 51, a vibrating plate 52, and each of the piezoelectric elements 25, 26, 27, and 28 described in the first embodiment. Metal substrate 40 at the end
The metal plate 4 is fitted by welding, soldering, etc. to the center of the metal plate 4.
0 and extends horizontally toward the rear of the vehicle.

The diaphragm 52 is formed by bending a band-shaped metal plate punched into a U-shape as shown in FIG. 5 into the shape shown in FIG. The re-vibration portions 52 extend symmetrically in opposite directions.
b, 52C, and vibrating portions 52d, 52e integrally extending from one outer end portion of each vibrating portion 52b, 52C in a direction perpendicular thereto. In such a case, the re-vibrating portion 52 b is arranged such that the re-vibrating portions 52 d and 52 e are located above and below and extend horizontally toward the rear of the vehicle.
, '52C is arranged vertically in its longitudinal direction, the base 52a of the diaphragm 52 is fitted to the tip of the metal pin 51 at its center by welding, soldering, etc. Both 52d and 52e are in the same vertical plane.

The piezoelectric element 25 is attached to one surface of the vibrating part 52b of the diaphragm 52 with its negative electrode, and its piezoelectric conversion action causes the vibrating part 52b to move in the front-back direction (first direction) with the tip of the metal pin 51 as a reference. It vibrates at a predetermined resonance frequency in the Z direction in Figure 6). On the other hand, the piezoelectric element 26 is attached to one surface of the vibrating part 52C of the diaphragm 52 with its negative electrode, and its piezoelectric conversion action causes the vibrating part 52c to move into the vibrating part with the tip of the metal pin 51 as a reference. 52. It is vibrated at a predetermined resonance frequency in the front-rear direction (Z direction in FIG. 6) symmetrically with b.

Moreover, both piezoelectric elements 27 and 28 are respectively attached to the right side surface of each vibrating part 52d and 52e with their negative side electrodes. Therefore, under the Z-direction vibration of each vibrating part 52b, 52C based on the piezoelectric conversion action of each piezoelectric element 25, 26, the re-vibrating part 52d, 5'2e generates a Coriolis force according to the angular velocity ω of the vehicle. Each piezoelectric element 27. vibrates in the Y direction under the .
28 performs a piezoelectric conversion action to detect the angular velocity ω.

In addition, in FIG. 4, the symbol 40a indicates both connecting conductors 11°12
Reference numeral 40b indicates a guide tube for the connecting conductor 13, and reference numeral 40c indicates a guide tube for the connecting conductor p4.

In this second embodiment configured as described above, when assembling the device of the present invention to a part of the vehicle body of the vehicle, the following steps are taken:
A diaphragm 52 formed by bending a single metal plate is attached to the metal substrate 40 by a metal pin 51 at the center of its base 52a.
Because it only needs to be supported on a part of the vehicle body through the can be maintained at a high level without any installation error. In such a case, each vibrating portion 52b, 52c.

Since 52d and 52e are integrally formed by bending a single metal plate as described above, the structure of the vibration mechanism 50 is simpler than in the conventional case.

In the above embodiment, an example was explained in which the diaphragm 52 is formed by bending a single metal plate punched into a U-shape. Even if a diaphragm 53 formed by bending the formed band-shaped metal plate into the shape shown in FIG. 7 is used in place of the diaphragm 52, the effect is substantially the same as that of the second embodiment. can be achieved. In such a case, the base 53a of the diaphragm 53, each vibrating part 53. b, 53C and each vibrating part 53
d, 53e shake the base 52a of the I plate 52, each vibrating part 52
b, 52C and each vibrating part 52d, 52e, each vibrating part 53d, 53e extends perpendicularly from each vibrating part 53b, 53c point-symmetrically with respect to the tip of the metal pin 51, and each piezoelectric element 27.28 is each vibrating part 53d,
The only difference from the second embodiment is that it is attached to the opposite surface side of 53e.

Furthermore, in the second embodiment, each vibrating section 52b, 5
2c, 52d, and 52e are a diaphragm 5 made of a single metal plate.
Although an example has been described in which three diaphragms 54. ．．
55.56 is adopted in place of the diaphragm 52, and both driving parts 54.1) of the diaphragm 54 are used.

Notch grooves 54d and 54 bored at the center of each outer end of 54 and c.
Even if the proximal ends of the diaphragms 55 and 56 are welded orthogonally to e as shown in FIG. Achieve the effect of iM.

Furthermore, in each of the embodiments and modifications described above, an example in which the device of the present invention is applied to detecting the angular velocity of a vehicle has been described. The invention may also be implemented by applying the invention device.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a first embodiment of the present invention, FIG. 2 is a perspective view showing a modification of the second embodiment, FIG. 3 is a developed view of the diaphragm in FIG. 2, and FIG. is a perspective view showing the second embodiment of the present invention, FIG. 5 is a developed view of the diaphragm in FIG. 4,
Figure 6 is an explanatory diagram of the vibration state of the diaphragm in Figure 4;
The figure is a perspective view showing a modification of the second embodiment, FIG. 8 is a developed view of the diaphragm in FIG. 7, and FIG. 9 is a perspective view showing another modification of the second embodiment. . Explanation of symbols 10.4.0...Metal substrate, 20.30.50...
Vibration mechanism, 21.51 ... Metal pin, 22°23,
24.3], 52.53.54. , 55.56...
Vibration plate, 22 b, 22 c, 3 l b,
31c, 52b, 52c, 52d, 52e,
53b. 53c, 53d, 53e, 54b, 54c...
- Vibration part, 25, 26, 27.28... piezoelectric element.

Claims (1)

[Claims] It has a first vibrating piece that vibrates in the vibration direction of the movable body, and a second vibrating piece that extends from the first vibrating piece and vibrates in a direction perpendicular to the first vibrating piece when an angular velocity is generated in the movable body. a vibrating body; a third vibrating piece that vibrates in the vibration direction of the movable body; and a third vibrating piece that extends from the third vibrating piece in parallel to the second vibrating piece, and when an angular velocity is generated in the movable body, the third vibrating piece vibrates. a vibrating body having a fourth vibrating piece that vibrates in the right angle direction; a first piezoelectric element that is fixed to the first vibrating piece so as to be distorted in the vibration direction thereof and performs a piezoelectric conversion action; a second piezoelectric element that is fixed to be distorted in the vibration direction and performs a piezoelectric conversion action; and a second piezoelectric element that is fixed to the third vibrating piece and performs a piezoelectric conversion action so as to be distorted in a phase direction opposite to the vibration direction of the first vibration piece. In the angular velocity detection device comprising three piezoelectric elements and a fourth piezoelectric element that is fixed to the fourth vibrating piece so as to be distorted in the vibration direction thereof and performs a piezoelectric conversion action, the first and third vibrating pieces are integrated into a single piece. The central part of the single vibrating piece is supported by an elastic pin on a part of the movable body, and the first and third piezoelectric elements are attached to the single vibrating piece at the center thereof. A vibration type angular velocity detection device characterized by being fixed on both sides of the part.