JP4191576B2 - Angular velocity detector - Google Patents

Description

  The present invention relates to an angular velocity detection device including an angular velocity meter that detects an angular velocity that rotates around an axis, and elastic support means that elastically supports the angular velocity meter on a support member.

When mounting a gyro for angular velocity detection on a radio controlled model helicopter, a pair of buffer members made of thermoplastic elastomer or silicone rubber at both ends of the gyro detection axis in order to buffer engine vibration and impact during landing The one which is elastically supported by the holding container is known from Patent Document 1 below.
Japanese Patent No. 2701759

  By the way, the above-mentioned conventional one allows the displacement of the gyro in the detection axis direction and the displacement in the radial direction by the deformation of the L-shaped flange formed on the outer peripheral portion of the buffer member. If the buffer members are deformed in the radial direction one side and the radial direction other side, respectively, there is a possibility that the gyro axis is inclined with respect to the detection axis direction and the angular velocity detection accuracy is lowered. In addition, since the rigidity of the L-shaped flange as a whole is low, the torsional rigidity around the detection axis is also low, and the rotation around the detection axis is difficult to be transmitted to the gyro as it is, which may reduce the accuracy of angular velocity detection. It was.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to assure angular velocity detection accuracy while effectively blocking vibration and impact applied to the angular velocity meter.

  In order to achieve the above object, according to the invention described in claim 1, an angular velocity meter for detecting an angular velocity rotating around an axis and an elastic support means for elastically supporting the angular velocity meter on a support member are provided. In the angular velocity detection device, the elastic support means is disposed in a plane perpendicular to the axis, and supports a diaphragm spring that can be deformed in the axial direction by supporting the angular velocity meter at the center, and a support member so as to surround the periphery of the axis. There is proposed an angular velocity detecting device including a cylindrical spring that is supported and supports an outer peripheral portion of a diaphragm spring at a plurality of locations on an inner peripheral surface and is deformable in a radial direction around an axis.

  According to the second aspect of the present invention, in addition to the configuration of the first aspect, an angular velocity detecting device is provided in which a diaphragm member and a cylindrical spring are provided with a damping member for reducing the deformation speed. Is done.

  In addition, the cross member 11 of an Example respond | corresponds to the support member of this invention.

  According to the configuration of the first aspect, since the angular velocity meter is supported in the central portion of the diaphragm spring that is arranged in a plane orthogonal to the axis and can be deformed in the axis direction, the diaphragm spring is prevented from vibration or shock in the axis direction. The rotation is transmitted as it is to the angular velocity meter by a diaphragm spring that exhibits strong rigidity against rotation around the axis while being easily deformed to exhibit an effective buffering action, and the angular velocity detection accuracy can be improved. Further, since the outer peripheral portion of the diaphragm spring is supported at a plurality of locations on the inner peripheral surface of the cylindrical spring supported by the support member so as to surround the periphery of the axis, the cylindrical spring is resistant to radial vibration and impact centered on the axis. The rotation is transmitted as it is to the angular velocity meter by a cylindrical spring having a strong rigidity against the rotation around the axis line, and the detection accuracy of the angular velocity can be improved. In addition, since the diaphragm spring and the cylindrical spring exhibit high rigidity even with respect to a load that causes the angular velocity meter to be inclined with respect to the axis, there is no risk that the angular velocity meter is inclined and the detection accuracy is not lowered.

  According to the configuration of the second aspect, since the damping member is provided in the diaphragm spring and the cylindrical spring, the deformation speed of the diaphragm spring and the cylindrical spring is reduced, and the vibration after the deformation of the diaphragm spring and the cylindrical spring is effectively damped. Thus, the buffering effect against disturbance can be further enhanced.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples of the present invention shown in the accompanying drawings.

  1 to 3 show an embodiment of the present invention. FIG. 1 is a front view of an angular velocity detection device, FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, and FIG. 3 is an exploded view of the angular velocity detection device. is there.

  The angular velocity detection device S detects a roll angular velocity about an axis L extending in the longitudinal direction of the vehicle body in order to detect the rollover (rollover) of the automobile and control the deployment of the airbag. The angular velocity detection device S is supported on a mounting surface orthogonal to the axis L, and in this embodiment is mounted on the front surface of the cross member 11 arranged in the left-right direction of the vehicle body.

  The angular velocity detection device S is provided with a cylindrical angular velocity meter 12 and is sandwiched between the center portions of a pair of metal diaphragm springs 13 and 13 formed in a circular dish shape, each of which has three bolts. It is fixed at 14 ... A donut-shaped damping member 15 made of foamable silicone rubber is fixed to the opposing surfaces of the pair of diaphragm springs 13 and 13 by adhesion. In this state, the angular velocity meter 12 is housed in a space surrounded by the pair of diaphragm springs 13 and 13 and the damping member 15 with an annular gap between the angular velocity meter 12 and the damping member. The harness 16 extending from the angular velocity meter 12 is led out from the space through a hole 13 a formed in the center of the rear diaphragm spring 13.

  A metal cylindrical spring 17 centered on the axis L is arranged so as to surround the pair of diaphragm springs 13 and 13, and three spacers fixed to the inner peripheral surface at 120 ° intervals. Each of the two bolts 19, 19 penetrating 18... Is screwed into the outer peripheral portion of the pair of diaphragm springs 13, 13. As a result, the assembly including the angular velocity meter 12, the diaphragm springs 13 and 13, and the damping member 15 is held inside the cylindrical spring 17. Three arc-shaped damping members 20 made of foamable silicon rubber are bonded to the inner peripheral surface of the cylindrical spring 17 so as not to interfere with the three spacers 18. An annular gap is formed between the inner peripheral surfaces of the three damping members 20 and the outer peripheral surfaces of the pair of diaphragm springs 13 and 13.

  Three cylindrical brackets 21 arranged at intervals of 120 ° are welded to the outer peripheral surface of the cylindrical spring 17 so as to be positioned between the three spacers 18. The three cylindrical brackets 21 are welded to the apex portion of the triangular substrate 22, and the angular velocity detecting device S is attached to the front surface of the cross member 11 with the brackets 21 and three bolts 23 penetrating the substrate 22. Fixed.

  Next, the operation of the embodiment of the present invention having the above configuration will be described.

  When the automobile equipped with the angular velocity detection device S rolls over, the rotation of the cross member 11 is transmitted to the angular velocity meter 12 via the substrate 22, the bracket 21..., The cylindrical spring 17, the spacer 18, and the pair of diaphragm springs 13 and 13. As the angular velocity meter 12 rotates around the axis L, the angular velocity of the rollover is detected. At this time, since the cylindrical spring 17 exhibits high rigidity in the direction of rotation around the axis L, and the diaphragm springs 13 and 13 also exhibit high rigidity in the direction of rotation around the axis L, the rotation of the cross member 11 remains as it is. 12 is prevented from being deteriorated in detection accuracy.

  When vibration or impact in the direction of the axis L is input to the angular velocity detection device S, the pair of diaphragm springs 13 and 13 exhibiting low rigidity with respect to the load in the direction of the axis L are easily bent in the direction of the axis L. Vibration and impact are prevented from being transmitted to the angular velocity meter 12. At this time, the deformation speed of the diaphragm springs 13 and 13 is reduced by the action of the damping member 15 and the vibration after deformation is quickly attenuated, so that the buffering effect is enhanced.

  When a radial vibration or impact centered on the axis L is input to the angular velocity detection device S, a cylindrical spring 17 having low rigidity against a radial load is formed at the intermediate portion of the three brackets 21. By being easily bent in the direction, the vibration and impact are prevented from being transmitted to the angular velocity meter 12. At this time, the deformation speed of the cylindrical spring 17 is reduced by the action of the damping members 20 and the vibration after the deformation is quickly attenuated, so that the buffering effect is enhanced.

  Furthermore, since the diaphragm springs 13 and 13 and the cylindrical spring 17 exhibit high rigidity even with respect to a load that causes the angular velocity meter 12 to be inclined with respect to the axis L, there is no possibility that the angular velocity meter 12 is inclined and the detection accuracy is not lowered.

  Although the embodiments of the present invention have been described above, various design changes can be made without departing from the scope of the present invention.

  For example, the material of the diaphragm springs 13 and 13 and the cylindrical spring 17 is not limited to metal, and any elastic material can be adopted.

  Further, two diaphragm springs 13 are not necessarily required, and may be one.

Front view of angular velocity detector 2-2 sectional view of FIG. Exploded view of angular velocity detector

Explanation of symbols

11 Cross member (support member)
12 Angular Velocity Meter 13 Diaphragm Spring 15 Damping Member 17 Cylindrical Spring 20 Damping Member L Axis

Claims (2)

In an angular velocity detection device comprising an angular velocity meter (12) for detecting an angular velocity rotating around an axis (L), and elastic support means for elastically supporting the angular velocity meter (12) on a support member (11),
The elastic support means is
A diaphragm spring (13) disposed in a plane perpendicular to the axis (L) and supporting an angular velocity meter (12) in the center and deformable in the direction of the axis (L);
The support member (11) is supported so as to surround the periphery of the axis (L), and the outer periphery of the diaphragm spring (13) is supported at a plurality of locations on the inner peripheral surface to deform in the radial direction about the axis (L). A possible cylindrical spring (17);
An angular velocity detection device comprising: The angular velocity detection device according to claim 1, wherein a damping member (15, 20) for reducing the deformation speed is provided on the diaphragm spring (13) and the cylindrical spring (17).

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