JP2011169652A - Device for measurement of displacement amount, and method for determining attitude angle of the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a displacement amount measuring device, capable of calculating translation amounts of three axes of the center of a bolt provided as a mount shaft of an engine mount and rotation amounts of two axes of the bolt with high accuracy, even in a high-speed vibration phenomenon, and to provide a method for determining the attitude angle of the displacement amount measuring device. <P>SOLUTION: A measuring method includes: a displacement-of-sphere measuring step of measuring displacements of two spheres 13, 13 which are fixed to both ends of the bolt 12 being the mount shaft of the engine mount 10 and whose radiuses are known, at three spots for each sphere with laser displacement meters 31-33, 34-36; a coordinate calculation step of calculating the three-dimensional coordinates X1, X2 of the centers I, J of the spheres 13, 13, respectively, on the basis of the displacement measurement results of the spheres 13, 13 obtained in the displacement-of-sphere measuring process; and a displacement-of-mount-shaft calculation step of calculating the translation amounts of the three axes of the center K of the bolt 12, and the rotation amounts θ, ϕ of two axes of the bolt 12, on the basis of the two three-dimensional coordinates X1, X2 calculated in the coordinate calculation step. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a displacement measurement device and a method for determining a posture angle of a displacement measurement device, and more particularly to a technique for improving measurement accuracy in measuring a displacement amount of an engine mount.

  Conventionally, in order to support the weight of the engine, prevent transmission of vibration from the engine to the body, and prevent the engine body from changing its position due to input from the road surface or torque reaction force generated by the engine itself, An engine mount is used for fixing to the frame (for example, see Patent Document 1 and Patent Document 2).

  Since the engine mount greatly affects the vehicle's NVH (noise, vibration, and harshness), it is important to evaluate the body transmission force that the engine mount gives to the body. The body transmission force can be obtained by measuring the dynamic spring coefficient of the engine mount and the deformation amount of the engine mount (the displacement amount at the center of the engine mount).

Japanese Patent Laid-Open No. 6-17877 JP-A-6-122325

A method for measuring the amount of displacement of the engine mount in the prior art will be described with reference to FIGS.
FIG. 14 is a diagram showing a displacement amount measuring method for a first engine mount according to the prior art. As shown in FIG. 14, in this method, the direction perpendicular to the axis of the bolt is above and to the side of the bolt that is the mount shaft of the engine mount, which is disposed on the vibration-proof elastic body that is the engine mount body. Two potentiometer-type linear displacement meters are arranged in the x-axis direction and the y-axis direction in FIG. 14, and the probe extended from the linear displacement meter is brought into contact with the bolt. Then, the displacement amount of the engine mount is measured by measuring the displacement amount of the bolt with the linear displacement meter.

  However, according to the method, only the two-dimensional displacement (displacement in the x-axis direction and y-axis direction in FIG. 14) of the mount shaft in the engine mount can be measured, and the mount shaft is twisted (twist deformation). Can not be measured. Furthermore, since the measurement responsiveness is low, high-speed vibration phenomenon could not be captured.

  FIG. 15 is a diagram illustrating a second engine mount displacement measuring method according to the prior art. As shown in FIG. 15 (a), in this method, an acceleration pickup is disposed on the engine mount, the acceleration when the engine mount is displaced is measured by the acceleration pickup, and the acceleration is integrated twice. The amount of displacement is obtained. FIG. 15A shows a state in which the shaft center is inclined due to the engine mount being deformed by the force applied from the engine.

  However, according to the above method, since the displacement is obtained from the acceleration, as shown in FIG. 15 (b), the integration error when performing the numerical integration twice increases with time, and the displacement with high accuracy can be obtained. There wasn't.

  Therefore, in the present invention, in view of the above situation, the three-axis translation amount at the center of the bolt disposed as the mount shaft of the engine mount, and the two-axis rotation amount of the bolt, even under a high-speed vibration phenomenon. Disclosed are a displacement amount measuring device and a posture angle determination method for the displacement amount measuring device, which can be calculated with high accuracy.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, according to the first aspect of the present invention, a measurement surface having a light projecting part and a light receiving part, which is disposed in the engine room of the vehicle by determining a posture angle using parallel line display means, and the measurement A reference surface disposed at a predetermined position with respect to the surface and provided with a single reference line or a plurality of parallel reference lines, and the light projecting portion serves as a mount shaft of the engine mount in the engine room. Displacement that irradiates measurement light to an arranged measurement object, and that the light receiving unit receives reflected light of the measurement light reflected by the measurement object, thereby measuring a displacement amount of the measurement object. After being positioned so that the reference plane is horizontal, the quantity measuring device is parallel to the center line connecting the centers of the opposing wheels on the left and right sides of the vehicle by the parallel line display means. Flat A horizontal direction posture of the reference plane is determined such that a line is displayed on the reference plane, and the direction of the one or a plurality of parallel reference lines and the parallel lines are the same. An attitude angle of the measurement surface with respect to the vehicle is determined.

  According to a second aspect of the present invention, the parallel line display means irradiates irradiation light on a scanning plane parallel to the center line, and projects the irradiation light onto the reference plane, whereby the scanning plane and the reference plane are projected. A parallel light irradiation means for displaying a line of intersection with the surface as the parallel line is provided.

  According to a third aspect of the present invention, the parallel line display means has two ends of the same length, which are fixed so that one end is fixed to each center position of the vehicle facing the left and right sides of the vehicle and is parallel to each other. Each of the arm members and a horizontal member interconnecting the other ends of the arm members, and the parallel light irradiating means is disposed on the horizontal member, with respect to the axis of the horizontal member. By irradiating irradiation light on a parallel scanning plane and projecting the irradiation light onto the reference plane, an intersection line between the scanning plane and the reference plane is displayed as the parallel line.

  In Claim 4, on the reference plane, one or a plurality of orthogonal reference lines orthogonal to the reference line are provided, and the parallel light irradiation means is parallel to the center line. By irradiating parallel irradiation light on the parallel scanning surface and projecting the parallel irradiation light onto the reference surface, an intersection line of the parallel scanning surface and the reference surface on the reference surface is displayed as the parallel line. The orthogonal light irradiation means irradiates orthogonal irradiation light on an orthogonal scanning surface orthogonal to the center line, and projects the orthogonal irradiation light onto the reference surface, thereby the orthogonal scanning surface on the reference surface. And the line of intersection with the reference plane is displayed as an orthogonal line orthogonal to the parallel line, and the direction of the one or parallel reference lines and the parallel lines are the same, The one or a plurality of parallel orthogonal reference lines; The orthogonal lines, so that the direction is the same, by the horizontal orientation of the reference plane is defined, in which the posture angle of the measuring surface relative to the vehicle is determined.

  In Claim 5, it is arrange | positioned inside the engine room of a vehicle, and is arrange | positioned in a predetermined position with respect to the measurement surface which has a light projection part and a light-receiving part, and it is one or parallel A reference plane on which a plurality of reference lines are provided, and the light projecting unit irradiates a measurement object disposed on a mount shaft of an engine mount in the engine room with the light receiving unit. An attitude angle determination method for a displacement measuring device that measures a displacement amount of the measurement object by receiving reflected light of the measurement light reflected by the measurement object, wherein the reference plane is horizontal. The parallel lines are displayed on the reference plane parallel lines that are parallel to the center line connecting the centers of the wheels facing each other on the left and right sides of the vehicle. Single or parallel Several and reference line, by determining the horizontal position of the reference plane such that the parallel lines, the direction of the same, is what determines the attitude angle of the measuring surface relative to the vehicle.

  7. The parallel line display unit according to claim 6, wherein the parallel line display unit irradiates irradiation light on a scanning surface parallel to the center line, and projects the irradiation light onto the reference surface, thereby the scanning surface and the reference surface. A parallel light irradiation means for displaying a line of intersection with the surface as the parallel line is provided.

  In the present invention, the parallel line display means has two ends of the same length, which are fixed so that one end is fixed to each center position of the vehicle facing the left and right sides of the vehicle and extends parallel to each other. Each of the arm members and a horizontal member interconnecting the other ends of the arm members, and the parallel light irradiating means is disposed on the horizontal member, with respect to the axis of the horizontal member. By irradiating irradiation light on a parallel scanning plane and projecting the irradiation light onto the reference plane, an intersection line between the scanning plane and the reference plane is displayed as the parallel line.

  In Claim 8, on the reference plane, one or a plurality of orthogonal reference lines orthogonal to the reference line are provided, and the parallel light irradiation means is parallel to the center line. By irradiating parallel irradiation light on the parallel scanning surface and projecting the parallel irradiation light onto the reference surface, an intersection line of the parallel scanning surface and the reference surface on the reference surface is displayed as the parallel line. The orthogonal light irradiation means irradiates orthogonal irradiation light on an orthogonal scanning surface orthogonal to the center line, and projects the orthogonal irradiation light onto the reference surface, thereby the orthogonal scanning surface on the reference surface. As an intersecting line with the reference plane, it is displayed as an orthogonal line orthogonal to the parallel line, and the direction of the one or parallel reference lines and the parallel lines are the same, The single or parallel orthogonal reference When, it said orthogonal lines, so that the direction is the same, by determining the horizontal position of the reference plane, is what determines the attitude angle of the measuring surface relative to the vehicle.

  As effects of the present invention, the following effects can be obtained.

  According to the present invention, even under a high-speed vibration phenomenon, the three-axis translation amount at the center of the bolt arranged as the mount shaft of the engine mount and the two-axis rotation amount of the bolt can be calculated with high accuracy. Can do.

(A) is the figure which showed the engine mount which is a measuring object, (b) the figure which showed the volt | bolt which is the mount axis | shaft of an engine mount. The figure which showed the outline | summary of the displacement measuring device which concerns on 1st embodiment. The figure which similarly showed the measurement surface of the displacement measuring device. The figure which similarly showed the reference plane of the displacement measuring device. The perspective view which showed the vehicle which similarly arrange | positions the displacement measuring device. The side view which showed the vehicle which similarly arrange | positions the displacement measuring device. The front view which showed the vehicle which similarly arrange | positions the displacement measuring device. (A) The top view which showed the reference plane at the time of arrange | positioning the displacement measuring device which concerns on 1st embodiment, (b) shows the reference plane at the time of arranging the displacement measuring device which concerns on 2nd embodiment. Plan view. The figure which showed the flowchart of the displacement measuring method which concerns on 1st embodiment. The figure similarly shown about the coordinate calculation process of the displacement measuring method. The figure similarly shown about the coordinate calculation process. The figure which similarly showed the displacement state of the bolt of an engine mount. The figure which similarly showed the mount axis displacement calculation process of the displacement amount measuring method of an engine mount. The figure shown about the displacement measuring method of the 1st engine mount which concerns on a prior art. The figure shown about the displacement measuring method of the 2nd engine mount which concerns on a prior art.

Next, embodiments of the invention will be described.
It should be noted that the technical scope of the present invention is not limited to the following examples, but broadly covers the entire scope of the technical idea that the present invention truly intends, as will be apparent from the matters described in the present specification and drawings. It extends.

[Displacement measuring device 39]
As shown in FIG. 1 (a), the engine mount 10 that is a measurement target of the displacement measuring device 39 (see FIG. 2) is arranged on the body mainly inside the engine room of the vehicle V (see FIGS. 5 to 7). A bracket 21 provided, a vibration isolating elastic body 11 installed on the bracket 21, and a mount shaft for fixing the engine mount 10, and a bolt 12 inserted into a shaft center portion of the vibration isolating elastic body 11 And is composed of. Then, the engine is supported by the body by connecting the bolt 12 and a bracket disposed on the engine (not shown). With such a configuration, the body supports the weight of the engine through the engine mount 10 and prevents transmission of vibrations from the engine to the body. Also, the body of the engine body is caused by the input from the road surface and the torque reaction force generated by the engine itself. The posture is kept from changing. FIG. 1A shows a state in which the axis of the bolt 12 is inclined due to the engine mount 10 being deformed by the force applied from the engine.

In the present embodiment, as shown in FIG. 1A, two spheres 13 and 13 having a known radius r0 (see FIG. 11) are fixed to each of both ends of the bolt 12. ing. Specifically, as shown in FIG. 1B, the shafts I and J are positioned so that the centers I and J of the spheres 13 and 13 are positioned on the extension lines of the axial centers of the bolts 12 on the bolt head side and the nut side, respectively. The spheres 13 and 13 having substantially the same diameter as that of the bolt head and nut are fixed by welding or the like when viewed from the center.
In the present embodiment, a perfect sphere is used as the sphere 13. However, the sphere 13 only needs to have a known radius r0, and can be replaced with a hemisphere or the like.

Next, the displacement measuring device 39 according to the first embodiment of the present invention will be described with reference to FIG. 2 and the subsequent drawings, for convenience of explanation, the bolt 12 is illustrated with its axis oriented in the vertical direction.
As shown in FIG. 2, the displacement measuring device 39 includes a first laser displacement meter 31, a second laser displacement meter 32,..., A sixth laser displacement, which are first to sixth displacement measuring devices of the spheres 13 and 13. And a control device 38 serving as coordinate calculation means and mount shaft displacement calculation means.

Specifically, each of the first laser displacement meter 31 to the third laser displacement meter 33 and the fourth laser displacement meter 34 to the sixth laser displacement meter 36 is a set of three spheres. For 13 and 13, the displacements of the three sphere surfaces are measured. That is, the first laser displacement meter 31 to the third laser displacement meter 33 irradiate the measurement light in the irradiation directions that are parallel to each other, and the measurement points A to C, which are points where the measurement light intersects the surface of the sphere 13. The first laser displacement meter 31 to the third laser displacement meter 33 measure the position.
Similarly, the fourth laser displacement meter 34 to the sixth laser displacement meter 36 are also irradiated with measurement light in irradiation directions that are parallel to each other, and the measurement points D to F are points where the measurement light intersects the surface of the sphere 13. These positions are measured by the fourth laser displacement meter 34 to the sixth laser displacement meter 36. Accordingly, the first laser displacement meter 31 to the third laser displacement meter 33 and the fourth laser displacement meter 34 to the sixth laser displacement meter 36 are configured to measure the displacement of the respective spheres 13 and 13. Yes.

On the other hand, the control device 38 is electrically connected to each of the first laser displacement meter 31 to the sixth laser displacement meter 36 and is measured by the first laser displacement meter 31 to the sixth laser displacement meter 36. Further, the result of displacement of the spheres 13 and 13 can be input.
The control device 38 has an input function, a display function, a storage function, a communication function, various arithmetic functions, and the like. The calculation function, as will be described later, is a coordinate calculation means for calculating the respective three-dimensional coordinates Q1 and Q2 of the centers I and J of the spheres 13 and 13 based on the displacement results, and the coordinate calculation means. Based on the two three-dimensional coordinates Q1 and Q2 calculated in step 3, the three-axis translation amount (the displacement amount of the three-dimensional coordinate O) of the center K of the bolt 12 and the two-axis rotation amount (θ of the bolt 12) , Φ) is provided with a mount axis displacement calculating means.

  Next, a specific configuration of the first laser displacement meter 31 to the third laser displacement meter 33 (hereinafter collectively referred to as the laser displacement meter 30) will be described with reference to FIGS. In addition, about the 4th laser displacement meter 34-the 6th laser displacement meter 36, it shall be comprised similarly to the 1st laser displacement meter 31-the 3rd laser displacement meter 33, and the description is abbreviate | omitted.

  As shown in FIG. 3, each of the first laser displacement meter 31 to the third laser displacement meter 33 is formed in a substantially rectangular parallelepiped shape. The first measurement surface 31α to the third measurement surface 33α (hereinafter, collectively referred to as measurement surfaces 31α to 33α as appropriate) are formed on one surface. Further, on the surface opposite to the measurement surfaces 31α to 33α, a first reference surface 31β to a third reference surface 33β (hereinafter referred to as reference surfaces 31β to 33β as appropriate) are formed. Further, the laser displacement meter 30 is arranged so that the measurement surfaces 31α to 33α face the sphere 13 side.

  In addition, the first light projecting portion 31a to the third light projecting portion 33a are disposed on one end side in the longitudinal direction of the first measurement surface 31α to the third measurement surface 33α, and the first light receiving portion 31b is disposed on the other end side. A third light receiving portion 33b is provided. Then, by combining the first laser displacement meter 31 to the third laser displacement meter 33, each of the first measurement surface 31α to the third measurement surface 33α is configured to be on the same plane.

  Furthermore, each 1st light projection part 31a-3rd light projection part 33a irradiates the spherical body 13 with 1st measurement light Ra1-3rd measurement light Ra3. And each 1st light-receiving part 31b-3rd light-receiving part 33b reflected the 1st measurement light Ra1-the 3rd measurement light Ra3 of the 1st measurement light Ra1 reflected by the measurement points A-C of the said spherical body 13-3rd. By receiving the reflected light Rb3, the displacement of the sphere 13 is measured.

  In the laser displacement meter 30 according to the present embodiment, a first light projecting unit 31a disposed in the first laser displacement meter 31, a second light projecting unit 32a disposed in the second laser displacement meter 32, Are adjacent to each other, and the first light receiving portion 31b disposed in the first laser displacement meter 31 and the second light receiving portion 32b disposed in the second laser displacement meter 32 are adjacent to each other. The laser displacement meter 31 and the second laser displacement meter 32 are arranged close to each other. Further, the third light projecting unit 33a disposed in the third laser displacement meter 33 is located at an equal distance from the first light projecting unit 31a and the second light projecting unit 32a, and third The third laser displacement meter 33 so that the third light receiving portion 33b disposed in the laser displacement meter 33 is located at an equal distance from both the first light projecting portion 31a and the second light projecting portion 32a; The first laser displacement meter 31 and the second laser displacement meter 32 are arranged close to each other. That is, the first laser displacement meter 31 to the third laser displacement meter 33 are arranged so that the intervals between the three first light projecting units 31a to 33a are substantially equal.

  That is, in this embodiment, as shown in FIG. 3, the first measurement surface 31α and the second measurement surface 32α of the first laser displacement meter 31 and the second laser displacement meter 32 are arranged side by side so as to face the same direction. The end surface of the third laser displacement meter 33 on the third light projecting unit 33a side is the end surface of the first laser displacement meter 31 and the second laser displacement meter 32 on the first light projecting unit 31a and second light projecting unit 32a side. The third laser displacement meter 33 is arranged so that the third measurement surface 33α faces the same direction as the first measurement surface 31α and the second measurement surface 32α.

  On the other hand, as shown in FIG. 4, the first reference surface 31β is provided on the surface of the first laser displacement meter 31 to the third laser displacement meter 33 opposite to the sphere 13 side, that is, on the surface opposite to the measurement surfaces 31α to 33α. To third reference surface 33β (reference surfaces 31β to 33β) are formed. A single reference line L1 is provided on the reference surfaces 31β to 33β. In the present embodiment, the first laser displacement meter 31 to the third laser displacement are respectively provided between the first reference surface 31β and the second reference surface 32β and at a substantially central portion in the short direction of the third reference surface 33β. A reference line L1 is provided in the longitudinal direction of the total 33. A plurality of reference lines L1 can be provided as long as they are parallel to each other.

Next, a method of disposing the laser displacement meter 30 on the vehicle V will be described with reference to FIGS.
As shown in FIGS. 5 to 7, the laser displacement meter 30 is positioned inside the engine room of the vehicle V by using a parallel line display means to be described later, and through a fixing jig (not shown). Arranged. Specifically, first, the level surfaces (not shown) are positioned so that the reference surfaces 31β to 33β are horizontal, that is, the reference surfaces 31β to 33β are perpendicular to the vertical direction. More specifically, in a state where the reference surfaces 31β to 33β are horizontal, the fixing jig is disposed so as to be rotatable about the vertical axis.

Next, the parallel line Le1 is displayed on the reference planes 31β to 33β by the parallel line display means (see FIG. 8).
Specifically, as shown in FIGS. 5 to 7, the parallel line display means includes long arm members 53 </ b> L and 53 </ b> R having the same length, which are long members extending so as to be parallel to each other. Main components are a horizontal member 55 that is a long member in which the other ends of the left and right arm members 53L and 53R are connected to each other, and a laser projector 61 that is a parallel light irradiation means disposed on the horizontal member 55. It is configured. One end of each of the left and right arm members 53L and 53R is fixed to the center of each of the wheels (left front wheel WL and right front wheel WR in the present embodiment) that face each other on both the left and right sides of the vehicle V.

More specifically, the left arm member 53L and the right arm member 53R are fixed to the left and right front wheels WL and WR via the left and right mounting jigs 51L and 51R, respectively.
That is, the left mounting jig 51L is a flat plate member bent in a V shape, and has a fixing hole at a position facing two of the bolt holes of the left front wheel WL. Then, the bolts 51a and 51a are screwed into the left front wheel WL through the fixing holes to fix the left mounting jig 51L to the left front wheel WL as shown in FIGS. The left mounting jig 51L has a center hole at a position facing the center position of the left front wheel WL when it is fixed to the left front wheel WL. In other words, even if the left mounting jig 51L is rotated and mounted relative to the left front wheel WL, the center hole is configured to face the center position of the left front wheel WL. Then, the bolt 53a penetrating the left arm member 53L is screwed into the center hole, thereby fixing one end of the left arm member 53L at the center position of the left front wheel WL. Similarly, one end of the right arm member 53R is fixed to the center position of the right front wheel WR.

  In the present embodiment, the left arm member 53L and the right arm member 53R are disposed such that the axial centers thereof are directed in the vertical direction. Specifically, using weights or the like, they are arranged on the left and right front wheels WL and WR so as to be vertical. A horizontal member 55 is disposed with the upper ends of the left and right arm members 53L and 53R connected to each other. That is, the horizontal member 55 is disposed horizontally so as to be parallel to the center line LC connecting the centers of the left and right front wheels WL and WR. Note that the left arm member 53L and the right arm member 53R only need to be arranged in parallel, and the axial center direction is not limited to the vertical direction.

Then, the irradiation light La is irradiated by the laser projector 61. Specifically, the irradiation light La is irradiated so that the scanning plane is parallel to the center line LC. In other words, the laser projector 61 irradiates the irradiation light La on a scanning plane that is parallel to the axis of the horizontal member 55.
Then, the irradiation light La is projected onto the reference surfaces 31β to 33β, whereby an intersection line between the scanning surface and the reference surfaces 31β to 33β is displayed on the reference surfaces 31β to 33β as a parallel line Le1 ( (See FIG. 8 (a)). At this time, since the reference planes 31β to 33β maintain a horizontal state, the parallel line Le1 is parallel to the axis of the horizontal member 55 and the center line LC.

  In the present embodiment, the configuration is such that one parallel line Le1 is displayed on the reference planes 31β to 33β using the left and right arm members 53L and 53R, the horizontal member 55, the laser projector 61, and the like. The number and display method are not limited to the above configuration. That is, a method of displaying a plurality of parallel lines Le1, a method of displaying the parallel lines Le1 by arranging the laser projector 61 by another method, and displaying the parallel lines Le1 on the reference planes 31β to 33β using a jig or the like. There is no problem even if you do it.

In the state where the parallel lines Le1 are displayed on the reference planes 31β to 33β as described above, the directions of the reference lines L1 on the reference planes 31β to 33β and the parallel lines Le1 are the same as shown in FIG. Thus, the horizontal orientation of the reference surfaces 31β to 33β, that is, the orientation of the laser displacement meter 30 with respect to the vehicle V in the horizontal direction is determined. That is, since the reference line L1 is parallel to the center line LC, by making the directions of the reference line L1 and the parallel line Le1 the same, the longitudinal direction of the laser displacement meter 30 is relative to the traveling direction of the vehicle V. The direction can be determined to be orthogonal. Thereby, the attitude angles of the measurement surfaces 31α to 33α with respect to the vehicle V are determined. In FIG. 8A, the directions of the reference surfaces 31β to 33β are determined so that the reference line L1 and the parallel line Le1 are parallel to each other, but the reference line L1 and the parallel line Le1 coincide (the same). The direction of the reference planes 31β to 33β may be determined so as to be a line).
Further, other laser displacement meters are similarly arranged for each sphere 13.

  By arranging the laser displacement meter 30 in the vehicle V as described above, the measurement accuracy by the displacement measuring device 39 can be improved. That is, the level planes are arranged so that the reference planes 31β to 33β are horizontal, and the directions of the reference line L1 and the parallel line Le1 are the same, so that the measurement axis of the laser displacement meter 30 and the vehicle V ( The x-axis, y-axis, and z-axis directions can be matched. As a result, the angle error due to the laser displacement meter 30 being disposed with an angle shifted with respect to the vehicle V can be eliminated on the displacement meter side of the displacement measuring device 39.

  FIG. 8B shows reference planes 31β to 33β when the displacement measuring device according to the second embodiment is arranged. In addition to the configuration of the first embodiment, the displacement amount measuring apparatus according to the present embodiment is provided with two orthogonal reference lines L2 and L3 orthogonal to the reference line L1 on the reference surfaces 31β to 33β.

  Then, as in the first embodiment, the laser projector 61 irradiates the parallel irradiation light La on the parallel scanning plane parallel to the center line LC, and projects the parallel irradiation light La onto the reference surfaces 31β to 33β. Thus, an intersection line between the parallel scanning plane on the reference planes 31β to 33β and the reference planes 31β to 33β is displayed as a parallel line Le1. Further, the laser projector 61 irradiates the orthogonal irradiation light Lb / Lc on two orthogonal scanning planes orthogonal to the center line LC, and projects the orthogonal irradiation light Lb / Lc onto the reference surfaces 31β to 33β, thereby generating the reference Orthogonal lines Le2 and Le3 in which the intersecting lines between the orthogonal scanning planes on the planes 31β to 33β and the reference planes 31β to 33β are orthogonal to the parallel line Le1 are displayed.

  Thereafter, as shown in FIG. 8B, the directions of the reference line L1 of the reference surfaces 31β to 33β and the parallel line Le1 are the same, the orthogonal reference lines L2 and L3, the orthogonal lines Le2 and Le3, The horizontal orientations of the reference planes 31β to 33β, that is, the orientation of the laser displacement meter 30 with respect to the vehicle V in the horizontal direction are determined so that the directions of these are the same. In the present embodiment, the directions of the reference planes 31β to 33β are determined so that the reference line L1 and the parallel line Le1 match (become the same line), and the orthogonal reference lines L2 and L3 and the orthogonal lines Le2 and Le3 match. ing.

  By disposing the laser displacement meter 30 in the vehicle V as described above, the measurement accuracy by the displacement amount measuring device 39 can be further improved. That is, the reference planes 31β to 33β are arranged horizontally with a level, the directions of the reference line L1 and the parallel line Le1 are the same, and the orthogonal reference lines L2 and L3 and the orthogonal lines Le2 and Le3 By making the directions the same, the directions of the measurement axes (the x axis, the y axis, and the z axis) of the laser displacement meter 30 and the vehicle V can be easily matched. In other words, when the laser displacement meter 30 is disposed on the vehicle V, the direction of the laser displacement meter 30 can be easily adjusted by determining the direction using not only the parallel line Le1 but also the orthogonal lines Le2 and Le3. It is.

[Measurement method of engine mount displacement]
Next, an engine mount displacement measurement method according to the present invention will be described with reference to FIGS. The applicant of the present application has already filed a patent application for the outline of the engine mount displacement measurement method according to the present invention (Japanese Patent Application No. 2009-10434).

  As shown in FIG. 9, the engine mount displacement measuring method according to the present embodiment includes two spheres 13, 13 that are respectively fixed to both ends of a bolt 12 disposed as a mount shaft of the engine mount 10. Sphere displacement measuring step (3), measuring the displacement of each of the spheres 13 and 13 by the first laser displacement meter 31 to the third laser displacement meter 33 and the fourth laser displacement meter 34 to the sixth laser displacement meter 36. The three-dimensional coordinates Q1 and Q2 of the centers I and J of the spheres 13 and 13 are calculated based on step S1) in FIG. 9 and the displacement results of the spheres 13 and 13 measured in the sphere displacement measurement step, respectively. The three axes of the center K of the bolt 12 based on the coordinate calculation process (steps S2 to S7 in FIG. 9) and the two three-dimensional coordinates Q1 and Q2 calculated in the coordinate calculation process. Susumuryou (displacement amount of the three-dimensional coordinates O), and calculates the two-axis rotational amount of the bolt 12 (theta, phi), provided with a mounting shaft displacement calculation step (step S8 in FIG. 9), the.

Each step will be specifically described below.
First, in the spherical displacement measuring step, as described above, the first laser displacement meter 31 to the third laser displacement meter 33 change the displacement of the measurement points A to C on the surface of the one spherical body 13, and the fourth laser displacement meter 34 to the fourth laser displacement meter 34. The 6-laser displacement meter 36 measures the displacement of the measurement points D to F on the surface of the other sphere 13. And the displacement amount of measurement point AF measured with each laser displacement meter 31-36 is output to the control apparatus 38, and this control apparatus 38 acquires the output of each laser displacement meter 31-36. (Step S1).

Next, in the coordinate calculation step, the arithmetic function is a sensor comprising the X axis, the Y axis, and the Z axis for measuring the displacements of the measurement points A to C and D to F measured by the laser displacement meters 31 to 36, respectively. Coordinate conversion is performed to three-dimensional coordinates X1 to X3 and X4 to X6 viewed from the coordinate system (step S2).
Specifically, as shown in FIG. 10, coordinates X1 (xa, ya, za) to X3 (xc, yc, zc) are calculated based on the displacement amounts of the measurement points A to C. Similarly, three-dimensional coordinates X4 (xd, yd, zd) to X6 (xf, yf, zf) are similarly calculated for the other measurement points D to F.

Further, in the coordinate calculation step, the calculation function is based on the coordinates X1 to X3 and X4 to X6, and the three-dimensional coordinates of the center L of the circle passing through each of the three measurement points A to C shown in FIG. P1 is calculated. (Step S3).
Specifically, once the coordinates X1 to X3 of the three measurement points A to C are found, the coordinates of the points located equidistantly in any of the measurement points A to C are obtained geometrically. It becomes possible to obtain the coordinates P1 (xp1, yp1, zp1) of the center L of the circle passing through A to C. As a result, the calculation function calculates the coordinates P1 of the center L of the circle passing through the measurement points A to C based on the coordinates X1 to X3. Similarly, for the other sphere 13 (not shown), the three-dimensional coordinates P2 (xp2, yp2, zp2) of the center M of the circle passing through the measurement points D to F are calculated.

  Further, the arithmetic function geometrically calculates the distance between the center L · M and any of the measurement points A to C · D to F, thereby calculating the radii r1 and r2 of the two circles. (Step S4).

Further, the calculation function geometrically calculates distances k1 and k2 between the centers I and J of the spheres 13 and 13 and the plane determined by the three measurement points A to C and D to F (step) S5).
Specifically, since the radius r0 of the spheres 13 and 13 is known, as shown in FIG. 11, the three sides of the radius r0, the radius r1 and r2 of the circle, and the distance k1 and k2 between the planes are shown. The distance k1 · k2 with respect to the plane is calculated by using the three-square theorem in the right triangle formed by

  Further, the calculation function geometrically calculates the vertical vector n of the plane determined by the three measurement points A to C and D to F (step S6).

Further, in the coordinate calculation step, the calculation function is configured to determine the center coordinates P1 · P2 of the two circles, the distances k1 · k2 with respect to the plane, and the center I · of the sphere 13 · 13 based on the vertical vector n. J three-dimensional coordinates Q1 and Q2 are calculated (step S7).
Specifically, as shown in FIG. 11, the points moved by distances k1 and k2 from the centers L and M of the two circles in the direction of the vertical vector n are the centers I and I of the spheres 13 and 13, respectively. Therefore, the calculation function calculates the three-dimensional coordinates Q1 and Q2 of the center I of the spheres 13 and 13.

Next, in the mount axis displacement calculating step, the calculation function is based on the three-dimensional coordinates Q1 and Q2, and the three-axis translation amount of the center K of the bolt 12 (the displacement amount of the three-dimensional coordinate O), and the The biaxial rotation amount (θ, φ) of the bolt 12 is calculated (step S8).
Specifically, as shown in FIG. 12, since the center point of the center I · J is the center K of the bolt 12, the calculation function is based on the three-dimensional coordinates Q1 and Q2 and the center K of the bolt 12 is centered. The three-dimensional coordinates O (xo, yo, zo) are calculated. Then, by calculating the displacement amounts of the three-dimensional coordinate O in the X-axis direction, the Y-axis direction, and the Z-axis direction, the three-axis translation amount of the center K of the bolt 12 is calculated.
Further, as shown in FIG. 13, based on the three-dimensional coordinates Q1 and Q2 of the centers I and J and the three-dimensional coordinates O of the center K of the bolt 12, the bolt 12 from the X-axis centered on the Z-axis. The biaxial rotation amount (θ, φ) of the bolt 12 is calculated by calculating the rotation angle θ and the inclination φ from the Z axis.

By configuring as described above, the three-axis translation amount (displacement amount of the three-dimensional coordinate O) of the center K of the bolt 12 disposed as the mount shaft of the engine mount 10 even under a high-speed vibration phenomenon. , And the biaxial rotation amount (θ, φ) of the bolt 12 can be calculated with high accuracy.
Specifically, based on the displacement results of the spheres 13 and 13 measured by the first laser displacement meter 31 to the sixth laser displacement meter 36, the three-axis translation amount of the center K of the bolt 12 and the bolt 12 Since the configuration is such that the biaxial rotation amount is calculated, it is possible to measure the torsion (twisting deformation) of the mount shaft and to further improve the responsiveness of the measurement. In addition, since the engine mount displacement measurement method according to the present embodiment does not use numerical integration, an integration error does not occur, and a decrease in accuracy due to the integration error can be prevented.

When measuring the displacement amount as described above, when the laser displacement meter 30 is disposed in the vehicle V, the direction of the measurement axes (three axes of x-axis, y-axis, and z-axis) between the laser displacement meter 30 and the vehicle V Are configured to match. For this reason, it is possible to prevent the occurrence of an angle error due to a shift in angle with the vehicle V when the laser displacement meter 30 is installed.
Accordingly, the three-axis translation amount (displacement amount of the three-dimensional coordinate O) of the center 12 of the bolt 12 disposed as the mount axis of the engine mount 10 and the two-axis rotation amount of the bolt 12 under a high-speed vibration phenomenon. (Θ, φ) can be calculated with higher accuracy.

DESCRIPTION OF SYMBOLS 10 Engine mount 11 Anti-vibration elastic body 12 Bolt 13 Sphere 30 Laser displacement meter 31 1st laser displacement meter 32 2nd laser displacement meter 33 3rd laser displacement meter 61 Laser projector V Vehicle

Claims (8)

Arranged in the engine room of the vehicle by determining the attitude angle using parallel line display means,
A measurement surface having a light projecting unit and a light receiving unit, and a reference surface provided at a predetermined position with respect to the measurement surface and provided with one or a plurality of parallel reference lines,
The light projecting unit irradiates a measurement object disposed on a mount shaft of an engine mount in the engine room with the measurement light, and the light receiving unit reflects the reflected light of the measurement light reflected by the measurement object. A displacement measuring device that measures the amount of displacement of the measurement object by receiving light,
After being positioned so that the reference plane is horizontal,
The parallel line display means displays parallel lines on the reference plane that are parallel to the center line connecting the centers of the wheels facing each other on the left and right sides of the vehicle.
The attitude angle of the measurement plane with respect to the vehicle is determined by determining the horizontal attitude of the reference plane so that the directions of the one or a plurality of parallel reference lines and the parallel lines are the same. To be
Displacement measuring device characterized by that. The parallel line display means includes:
By irradiating irradiation light on a scanning plane parallel to the center line and projecting the irradiation light onto the reference plane, an intersection line between the scanning plane and the reference plane is displayed as the parallel line. Comprising a parallel light irradiation means,
The displacement amount measuring apparatus according to claim 1, wherein: The parallel line display means includes:
Two arm members of the same length, each end of which is fixed to each center position of the vehicle facing the left and right sides of the vehicle and extending so as to be parallel to each other;
A horizontal member that interconnects the other ends of the respective arm members,
The parallel light irradiation means is disposed on the horizontal member, irradiates irradiation light on a scanning plane parallel to the axis of the horizontal member, and projects the irradiation light onto the reference plane, thereby Displaying a line of intersection between a scanning plane and the reference plane as the parallel lines;
The displacement amount measuring apparatus according to claim 2, wherein: On the reference plane, one or a plurality of orthogonal reference lines orthogonal to the reference line are provided,
The parallel light irradiation means irradiates parallel irradiation light on a parallel scanning surface parallel to the center line, and projects the parallel irradiation light onto the reference surface, thereby the parallel scanning surface on the reference surface. And the line of intersection with the reference plane is displayed as the parallel line,
The parallel light irradiating means irradiates orthogonal irradiation light on an orthogonal scanning surface orthogonal to the center line, and projects the orthogonal irradiation light onto the reference surface, whereby the orthogonal scanning surface on the reference surface and The line of intersection with the reference plane is displayed as an orthogonal line orthogonal to the parallel line,
The one or parallel reference lines and the parallel lines have the same direction, and the one or parallel orthogonal reference lines and the orthogonal lines have the same direction. As described above, by determining the horizontal posture of the reference surface, the posture angle of the measurement surface with respect to the vehicle is determined.
The displacement amount measuring apparatus according to claim 2 or claim 3, wherein Arranged in the engine room of the vehicle,
A measurement surface having a light projecting unit and a light receiving unit, and a reference surface provided at a predetermined position with respect to the measurement surface and provided with one or a plurality of parallel reference lines,
The light projecting unit irradiates a measurement object disposed on a mount shaft of an engine mount in the engine room with the measurement light, and the light receiving unit reflects the reflected light of the measurement light reflected by the measurement object. An attitude angle determination method for a displacement measuring device that measures the amount of displacement of the measurement object by receiving light,
After positioning so that the reference plane is horizontal,
By means of parallel line display means, parallel lines that are parallel to the center line connecting the centers of the opposite wheels on the left and right sides of the vehicle are displayed on the reference plane,
A posture angle of the measurement surface with respect to the vehicle is determined by determining a horizontal posture of the reference surface so that directions of the one or a plurality of parallel reference lines and the parallel lines are the same. ,
A method for determining a posture angle of a displacement measuring device. The parallel line display means includes:
By irradiating irradiation light on a scanning plane parallel to the center line and projecting the irradiation light onto the reference plane, an intersection line between the scanning plane and the reference plane is displayed as the parallel line. Comprising a parallel light irradiation means,
The attitude angle determination method for a displacement measuring device according to claim 5, wherein The parallel line display means includes:
Two arm members of the same length, each end of which is fixed to each center position of the vehicle facing the left and right sides of the vehicle and extending so as to be parallel to each other;
A horizontal member that interconnects the other ends of the respective arm members,
The parallel light irradiation means is disposed on the horizontal member, irradiates irradiation light on a scanning plane parallel to the axis of the horizontal member, and projects the irradiation light onto the reference plane, thereby Displaying a line of intersection between a scanning plane and the reference plane as the parallel lines;
The attitude angle determination method for a displacement amount measuring apparatus according to claim 6, wherein: On the reference plane, one or a plurality of orthogonal reference lines orthogonal to the reference line are provided,
The parallel light irradiation means irradiates parallel irradiation light on a parallel scanning surface parallel to the center line, and projects the parallel irradiation light onto the reference surface, thereby the parallel scanning surface on the reference surface. And the line of intersection with the reference plane is displayed as the parallel line,
The parallel light irradiating means irradiates orthogonal irradiation light on an orthogonal scanning surface orthogonal to the center line, and projects the orthogonal irradiation light onto the reference surface, whereby the orthogonal scanning surface on the reference surface and As an intersecting line with the reference plane, it is displayed as an orthogonal line orthogonal to the parallel line,
The one or parallel reference lines and the parallel lines have the same direction, and the one or parallel orthogonal reference lines and the orthogonal lines have the same direction. By determining the horizontal orientation of the reference plane, the attitude angle of the measurement surface relative to the vehicle is determined.
The method of determining a posture angle of a displacement amount measuring apparatus according to claim 6 or 7, wherein:

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