JP2013104862A - Three-dimensional displacement measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a three-dimensional displacement measuring device capable of measuring displacement with accuracy using a three-dimensional displacement measuring unit having a simple structure.SOLUTION: The three-dimensional displacement measuring device uses a three-dimensional displacement sensor 1 in which wire potentiometers 2 having pulleys wound with wires 3 therearound to detect the lengths of the wires 3 drawn on the basis of rotation angles of the pulleys rotated by drawing the wires 3 are mounted at peripheral direction angle 120° intervals at three portions on a base plate 11, and an output signal from each of the three wire potentiometers 2 of the three-dimensional displacement sensor 1. Only if the drawn lengths of the wires 3 of the three wire potentiometers 2 are measured, a three-dimensional position at a displacement measuring end 5 at a vertex of a triangular pyramid comprising the three wires 3 can be uniquely specified, and the three-dimensional position can be easily converted into a right-angle three-dimensional coordinate of XYZ using a conversion formula.

Description

  The present invention relates to a three-dimensional displacement measuring apparatus, and more particularly, to a pulley around which a wire is wound and a potentiometer that detects the length of the drawn wire based on the rotation angle of the pulley that rotates when the wire is drawn. The present invention relates to a three-dimensional displacement measuring apparatus.

Conventionally, there is a non-contact type system that uses ultrasonic waves, light, laser light, or the like as a system for dynamically measuring the relative displacement between two points using three-dimensional coordinates. However, while these measurement systems can obtain high accuracy, they are generally expensive and have a drawback that many of the measurement apparatuses themselves have large dimensions.
On the other hand, it was also possible to measure displacement by combining existing contact displacement gauges, but it was difficult to detect dynamic displacement or it could not be installed in a narrow place due to restrictions on external dimensions. In addition, since the measurement result is obtained in three-dimensional coordinates, there is a problem that positioning at the time of attachment is difficult.

  As a three-dimensional displacement measurement system for solving this problem, a technique described in Patent Document 1 is disclosed. In the three-dimensional displacement detection unit constituting the three-dimensional displacement measurement system, the sensor main body is attached to the stationary part, and the measuring element is attached to the measurement point where the measurement object is displaced. When the probe receives vibration or displacement from the measurement point in this state, the connecting rod connected to the probe via the universal joint rotates the first rotating member around the vertical axis, and the connecting rod The second rotating member rotates about the horizontal axis. The connecting rod is also configured to be able to expand and contract with the movement of the probe. The respective rotation angles of the first rotation member and the second rotation member are detected by first and second angle detectors provided individually. Expansion and contraction of the connecting rod is detected by a displacement detector that detects the length of the wire drawn out by the rotation angle.

  In Patent Document 1, three three-dimensional displacement detection units described above are used, and signals from the first and second angle detectors and displacement detectors obtained from the three three-dimensional displacement detection units are used. A technique is described in which a displacement in three-dimensional orthogonal coordinates of XYZ and a six-degree-of-freedom three-dimensional displacement of rotation about the X, Y, and Z axes are measured by analysis with a personal computer.

JP 2007-315815 A (see FIGS. 1 to 8)

However, the connecting rod of the three-dimensional displacement detection unit described in Patent Document 1 is composed of a stretchable and highly rigid member, and the base side opposite to the side on which the probe of the connecting rod is provided is the stationary part. Are connected in a rotatable manner around a vertical axis and a horizontal axis.
Therefore, inertia is large to measure the displacement due to the high-speed vibration of the object to be measured at high speed, and disturbance is given to the displacement of the object to be measured, which causes a problem in measuring the displacement with high accuracy. there were.

  The present invention solves the above-described conventional problems, and an object of the present invention is to provide a three-dimensional displacement measuring apparatus that enables accurate displacement measurement using a three-dimensional displacement measuring unit having a simple structure. And

In order to solve the above-mentioned problem, the three-dimensional displacement measuring device according to claim 1 has a pulley around which a wire is wound, and is pulled out based on a rotation angle of a pulley that rotates when the wire is pulled out. Three potentiometers for detecting the length of the wire are composed of a three-dimensional displacement measuring unit mounted on one support substrate with a predetermined circumferential angle interval, and three potentiometers of the three-dimensional displacement measuring unit. Potentiometer signal acquisition means for acquiring the respective output signals of
The input means that can be input by the measurer and the three wire potentiometers of the three-dimensional displacement measuring unit are joined at one point to the tip of the wire lead-out portion to form a displacement measuring end, and a triangular pyramid is formed with three wires. The displacement measurement end is fixed to a predetermined measurement point of the measurement object, and according to the input from the input means by the measurer, the right angle of XYZ with respect to the initial position of the predetermined measurement point of the measurement object Coordinate axis setting means for setting the direction of each coordinate axis of the three-dimensional coordinate system, and an initial position of a predetermined measurement point of the object to be measured based on the output signals from the three potentiometers according to the input from the input means by the measurer Conversion formula setting means for setting a conversion formula for converting each displacement amount in the X direction, Y direction, and Z direction of the set right angle three-dimensional coordinate system from, and the conversion set by the conversion formula setting means Based on the output signals from the three potentiometers, the amount of displacement in the X, Y, and Z directions of the right-angle three-dimensional coordinate system of the predetermined measurement point of the object to be measured from the initial position is calculated. Measuring point displacement amount calculating means.

According to the first aspect of the present invention, the telescopic connecting rod provided with the displacement detector for detecting the telescopic displacement as described in Patent Document 1, and the base side thereof can rotate around the vertical axis and the horizontal axis. As a simple configuration, the first and second angle detectors are provided to detect the angular displacement around the vertical axis and the horizontal axis, and the drawing length of the three potentiometer wires is simply eliminated. By simply measuring the three-dimensional position of the displacement measurement end of the apex of the triangular pyramid composed of three wires, it can be easily converted into XYZ right-angle three-dimensional coordinates using a conversion formula.
Therefore, the inertia of the three wires is extremely small, and the high-speed vibration displacement of the object to be measured can be measured more accurately than the technique disclosed in Patent Document 1. Also, using three potentiometers, the three-dimensional displacement measuring apparatus of the present invention can be manufactured at a much lower cost than a conventional non-contact type using ultrasonic waves, light, laser light, or the like.

  The three-dimensional displacement measuring device of the invention according to claim 2 has at least three or more locations for the measurement object that can be assumed to be a three-dimensional solid body in addition to the configuration of the invention of claim 1. Measurement point coordinate setting means for setting the X coordinate, Y coordinate, and Z coordinate of the set right angle three-dimensional coordinate system related to the initial position of the predetermined measurement point of the measurement object according to the input from the input means by the measurer; In the set right-angle three-dimensional coordinate system relating to the initial position of the predetermined target point of the measurement target object for which the respective displacement amounts in the X-direction, Y-direction, and Z-direction are to be obtained. Attention point coordinate setting means for setting the X coordinate, Y coordinate, and Z coordinate in accordance with an input from the input means by the measurer, and at least three predetermined points of interest set in the set object to be measured Predetermined object to be measured Based on the relative positions of the X coordinate, Y coordinate, and Z coordinate of a set right angle three-dimensional coordinate system with predetermined measurement points of at least three or more measurement target objects that are different from the measurement points. And a point-of-interest displacement amount calculating means for calculating a displacement amount in the X direction, Y direction, and Z direction of the set right-angle three-dimensional coordinate system from the initial position of the point of interest. .

According to the second aspect of the present invention, the measurement object is provided with predetermined measurement points of at least three or more measurement objects, and the displacement amount is measured by the three-dimensional displacement measurement unit. Therefore, the displacement amount at the measurement point in the X direction, Y direction, and Z direction of the set right-angle three-dimensional coordinate system can be calculated. Further, the X coordinate, Y coordinate, and Z coordinate of the right-angle three-dimensional coordinate system of the predetermined measurement points of at least three or more objects to be measured are input, and the X-coordinate, Y-coordinate of the right-angle three-dimensional coordinate system of the target point, Since the Z coordinate is also input, the amount of displacement in the X direction, Y direction, and Z direction of the right-angle three-dimensional coordinate system of the point of interest different from the measurement point by the point of interest displacement calculation means is the difference between the measurement point and the point of interest. It can be calculated from the relative positional relationship of the right-angle three-dimensional coordinate system between them and the amount of displacement in the X-direction, Y-direction, and Z-direction of the right-angle three-dimensional coordinate system at at least three measurement points.
Therefore, the point of interest that cannot be selected as a measurement point because it interferes with the object to be measured due to the external shape of the object to be measured, or interferes with externally mounted products attached to the object to be measured. It is possible to easily obtain the amount of displacement in the X direction, the Y direction, and the Z direction of the orthogonal three-dimensional coordinate system indirectly.

  A three-dimensional displacement measuring apparatus according to a third aspect of the present invention has the configuration of the invention according to the second aspect, wherein the object to be measured is an object in which a vehicle engine and a transmission are integrally coupled. The X-axis of the right-angled three-dimensional coordinate system is the rotation center axis of the crankshaft when the engine is stopped, and the Z-axis is a vertical axis perpendicular to the X-axis included in a vertical plane perpendicular to the X-axis. The Y axis is a horizontal axis orthogonal to the X axis and the Z axis included in the vertical plane, and the predetermined target point of the object to be measured is a part where the engine and the transmission are supported by the vehicle body. The point-of-interest displacement calculation means takes into account at least the roll vibration around the X axis due to the rotation of the engine, and the X-direction, Y-direction and Z-direction of the set three-dimensional rectangular coordinate system from the initial position of the point of interest. The amount of displacement in the direction is calculated.

  According to the third aspect of the present invention, the object to be measured is a vehicle engine and a transmission that are integrally coupled, and the set X-axis of the three-dimensional coordinate system indicates that the engine is stopped. Is the rotation center axis of the crankshaft at the time, the Z axis is a vertical axis perpendicular to the X axis included in the vertical plane perpendicular to the X axis, and the Y axis is included in the X axis and the vertical plane It is a horizontal axis orthogonal to the Z axis. Then, based on the setting of the X-axis, Y-axis, and Z-axis of the right-angle three-dimensional coordinate system, attention is paid from the displacement amounts in the X-direction, Y-direction, and Z-direction of the right-angle three-dimensional coordinate system at at least three measurement points. The point displacement amount calculation means includes a displacement amount in the X direction, Y direction, and Z direction of the right-angle three-dimensional coordinate system of the point of interest and a displacement component due to roll vibrations of the engine and the transmission at least around the X axis, that is, around the crankshaft. And can be calculated.

  In addition to the configuration of the invention according to claim 3, the three-dimensional displacement measuring device of the invention according to claim 4 is such that the Y-axis and Z-axis of the set right-angle three-dimensional coordinate system are perpendicular to the X-axis. In addition, the center of gravity of the engine and transmission united together is set in a vertical plane including the center of gravity, and the point-of-interest displacement calculation means is set for a predetermined point of interest of the object to be measured. The translational displacement components in the X, Y, and Z directions of the origin of the right angle three-dimensional coordinate system and the displacement components of the roll vibration around the X axis, the pitch vibration around the Y axis, and the yaw vibration around the Z axis It is characterized by calculating.

  According to the fourth aspect of the present invention, the origin of the set right-angle three-dimensional coordinate system is the center of gravity of the X-axis which is the rotation center axis of the crankshaft of the engine and the engine and the transmission which are integrally coupled. The vertical axis orthogonal to the X axis included in the vertical plane perpendicular to the X axis included is the Z axis, and the horizontal axis orthogonal to the Z axis included in the X axis and the vertical plane is defined as the Y axis. . Accordingly, in the point-of-interest displacement calculation means, the translational displacement of the origin in the X, Y, and Z directions from the displacement in the X, Y, and Z directions of the orthogonal three-dimensional coordinate system at at least three measurement points. It is possible to calculate an amount component and displacement amount components of roll vibration around the X axis, pitch vibration around the Y axis, and yaw vibration around the Z axis.

  For example, when it is desired to measure the amount of displacement in an engine operating state of a support receiving portion supported by a vehicle body by elastically absorbing vibrations through an engine mount when an engine and a transmission are integrally coupled, The amount of displacement may not be directly measured by equipment, piping, instrumentation lines, etc. arranged around the transmission. In such a case, using the support receiving portion as a point of interest, the point-of-interest displacement calculation means can calculate the three-dimensional displacement amount of the support receiving portion in the engine operating state. At this time, the point-of-interest displacement calculation means calculates not only the translational displacement component applied to the engine mount, but also the displacements of the roll vibration around the X axis, the pitch vibration around the Y axis, and the yaw vibration around the Z axis. The component can also be calculated, and in the analysis of the durability test of the engine mount, an improvement direction in consideration of the displacement component applied to each engine mount can be obtained.

  According to the present invention, it is possible to provide a three-dimensional displacement measuring apparatus that enables accurate displacement measurement using a three-dimensional displacement measuring unit having a simple structure.

FIG. 4 is a configuration explanatory view of a three-dimensional displacement sensor, (a) is a perspective view showing how to attach three wire potentiometers on a base plate with the sensor cover of the three-dimensional displacement sensor removed, and (b) It is a top view explaining the attachment method of the wire potentiometer to the circumferential direction on a baseplate. It is explanatory drawing of the change of the pull-out amount of the wire with respect to the movement of the displacement measuring end which combined the tip of three wires in a three-dimensional displacement sensor to XYZ direction, (a) is a movement of the displacement measuring end to the Z direction. FIG. 4B is an explanatory diagram when the displacement measurement end is moved in the X direction, and FIG. 4C is an explanatory diagram when the displacement measurement end is moved in the Y direction. It is explanatory drawing of the example of installation of a three-dimensional displacement sensor in the case of measuring the vibration displacement of the coupling body of an engine and a transmission with three three-dimensional displacement sensors. It is a functional block block diagram of a three-dimensional displacement measuring device.

  Hereinafter, a three-dimensional displacement measuring apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings.

<< 3D displacement sensor >>
A three-dimensional displacement sensor according to this embodiment will be described with reference to FIG. FIG. 1 is a configuration explanatory view of a three-dimensional displacement sensor, (a) is a perspective view showing how to attach three wire potentiometers on a base plate shown with a sensor cover of the three-dimensional displacement sensor removed; (B) is a top view for explaining a method of attaching three wire potentiometers on the base plate in the circumferential direction.
A three-dimensional displacement sensor (three-dimensional displacement measuring unit) 1 is fixed to a vertical plate 12 in which a wire potentiometer (potentiometer) 2 is made of a metal plate material as shown in FIGS. Further, the vertical plate 12 is fixed by being screwed into a fixing female screw hole (not shown) on the lower surface side of FIG. 1 with a screw through which a screw hole (not shown) of the base plate 11 is inserted from the lower surface side. For this reason, a counterbore hole is provided on the lower surface side of the screw hole (not shown) for attaching the vertical plate 12 of the base plate 11 so that the screw head sinks without protruding to the lower surface side.

  The wire potentiometer 2 has a configuration in which a pulley (not shown) disposed in the case of the wire potentiometer 2 winds up the wire 3, and a spiral spring (not shown) that always gives a restoring force in the direction of winding the wire to the pulley. Has been. For example, a permanent magnet is arranged in a predetermined circumferential arrangement on a rotating disk that rotates integrally with the pulley, and a Hall element is arranged in the vicinity thereof, and the signal of the Hall element indicates the rotation angle of the pulley, that is, the wire It is comprised so that the drawn-out length may be shown.

As shown in FIG. 1B, the wire potentiometer 2 is screwed through a vertical plate 12 so that the wire drawing hole 2a of the case is spaced 120 degrees in the circumferential direction with respect to the plane center O of the base plate 11. Has been. Then, for example, the wire lead-out hole 2a of one of the three wire potentiometers 2 is pulled perpendicularly from the plane center O to a specific side 11c of the base plate 11 as shown in FIG. It is set so as to correspond to the direction of the line (indicated by the arrow Y + in FIG. 1A). Here, the specific one side 11c is hereinafter referred to as “reference side 11c”. Incidentally, the “reference side 11c” is referred to as an XYZ orthogonal cubic based on the assumption that the direction indicated by the reference side 11c is set to indicate the X-axis direction in an XYZ orthogonal three-dimensional coordinate system to be described later. This is because an input method for setting each coordinate axis direction of the original coordinate system can be prepared in advance, and the setting of each coordinate axis direction of the XYZ right-angle three-dimensional coordinate system can be simplified.
As will be described later, when the base plate 11 is fixed to the ceiling surface of the test stand 32 (see FIG. 3) where the three-dimensional displacement sensor 1 is a fixed point and the wire 3 is drawn downward, an XYZ rectangular coordinate system. The X-axis and Y-axis are set, for example, as shown in FIG. 1B, and the Z-axis is defined as the Z-axis (+) direction facing the paper surface.

  The base plate 11 has, for example, a rectangular plate shape, and has mounting screw holes 11a in which female threads are cut in the vicinity of the four corners. As shown in FIG. 1B, the base plate 11 has a plurality of female screw holes 11b for fixing the sensor cover 13 to the plate thickness surface.

As shown in FIG. 1A, the sensor cover 13 is covered from the upper side of the base plate 11, and the sensor cover 13 is inserted into the screw hole 13e on the lower end side of the sensor cover 13 provided at a position corresponding to the female screw hole 11b of the base plate 11. The sensor cover 13 is fixed to the base plate 11 by inserting a screw for fixing the screw into the female screw hole 11b.
The sensor cover 13 is provided with a plurality of screw holes 13 b corresponding to the positions of two fixing female screw holes 12 a provided on the upper end surface of the three vertical plates 12. A screw (not shown) for fixing the plate 12 is inserted and fitted into the fixing female screw hole 12a.

The three wires 3 pulled out from the wire pull-out hole 2a of the wire potentiometer 2 are each pulled out by inserting a long wire lead-out hole 13a extending long radially outward into the sensor cover 13, and the tip thereof is displaced. The measuring end 5 is connected at one point. The width of the wire lead-out hole 13a is desirably set to a size that does not slide on the edge of the wire lead-out hole 13a with respect to the displacement of the displacement measuring end 5.
This is because, when the displacement measuring end 5 is attached to the object to be measured, the three wires 3 are linear from the wire drawing hole 2a to the displacement measuring end 5 with respect to the displacement of the displacement measuring end 5, This is because the displacement measurement end 5 is assumed to be the apex of a triangular pyramid formed by linearly extending from the wire lead-out hole 2a, and the correlation equation described later is set on the assumption of the displacement measurement of the displacement measurement end 5.

  As shown in FIG. 1A, the sensor cover 13 is basically a rectangular tube shape having a bottom on the upper surface (ceiling side), and one of its side faces the reference side 11c of the base plate 11. It is a side surface corresponding to the side 11d, and constitutes a fixing side surface 13c. At the peripheral edge of the fixing side surface 13c, there is provided a mounting screw hole 13d having a female screw cut so as not to interfere with the above-described screw hole 13e for fixing the base plate 11 and the sensor cover 13, and this mounting screw hole 13d. It is possible to fix the three-dimensional displacement sensor 1 by screw-fitting to the screw.

FIG. 2 is an explanatory diagram of a change in the amount of wire drawn with respect to the movement in the XYZ directions of the displacement measurement end in which the tips of three wires are combined in the three-dimensional displacement sensor, and (a) is the Z direction of the displacement measurement end. FIG. 4B is an explanatory diagram when the displacement measurement end is moved in the X direction, and FIG. 4C is an explanatory diagram when the displacement measurement end is moved in the Y direction. .
Thus, even if the displacement measuring end 5 moves from the initial position to the position indicated by 5 'in the Z direction, the X direction, and the Y direction, respectively, the bottom surface of an equilateral triangle having the three wire lead holes 2a as apexes. The length of the ridge line of the triangular pyramid, that is, the wire 3 was pulled out from the wire pull-out hole 2a by a triangular pyramid having three wires 3 extending linearly from the wire pull-out hole 2a to the displacement measuring end 5 as ridge lines. If the amount is known, the position in the three-dimensional space from the center point of the bottom surface of the triangular pyramid of the displacement measuring end 5 which is the apex of the triangular pyramid can be uniquely calculated and determined. The relative positional relationship between the center of the bottom surface of the equilateral triangle whose apexes are the three wire drawing holes 2a of the base plate 11 of the three-dimensional displacement sensor 1 and the plane center O (see FIG. 1B) is known. Therefore, the relative position of the displacement measuring end 5 from the plane center O can be easily calculated three-dimensionally and uniquely.

<< Overall configuration of three-dimensional displacement measuring device >>
Next, the three-dimensional displacement measuring device 50 will be described with reference to FIGS.
FIG. 3 is an explanatory diagram of an installation example of a three-dimensional displacement sensor when the vibration displacement of the combined engine and transmission is measured by three three-dimensional displacement sensors.
In this example, the vehicle V is a front wheel drive vehicle in which the engine 21 is placed horizontally. Here, an object in which the engine 21 and the transmission (transmission) 23 are integrally coupled is an object to be measured, and the engine 21 and the transmission 23 are provided on the left and right frames 31L and 31R on the front side surface of the vehicle body. The engine mounts 26L and 26R are supported on the left and right of the vehicle V, and the engine mounts 28F and 28R provided on a subframe (not shown) support the front and rear of the engine 21.
The engine 21 has support receiving portions 25R, 27F, 27R supported by engine mounts 26R, 28F, 28R, and the transmission 23 has a support receiving portion 25L supported by the engine mount 26L.

  Then, the three-dimensional displacement amount of the engine 21 or the transmission 23 in each engine mount 26L, 26R, 28F, 28R is measured and used for analysis such as a durability test of the engine mount 26L, 26R, 28F, 28R. The purpose is to measure the three-dimensional displacement amount of the measurement object using the three-dimensional displacement measuring device 50 (see FIG. 4). For this purpose, for example, a test base 32 which is a substantially U-shaped frame indicated by an imaginary line is fixed on the left and right frames 31L and 31R by welding or the like, and three three-dimensional displacements are provided on the lower surface of the top plate. Sensors (three-dimensional displacement measuring units) 1A, 1B, 1C are fixed with screws. Here, the three-dimensional displacement sensors 1A, 1B, and 1C are the same as the three-dimensional displacement sensor 1 of FIG. 1, but the reference numerals are changed to 1A, 1B, and 1C to distinguish them. The displacement measurement ends 5A, 5B, and 5C are also the same as the displacement measurement end 5 of the three-dimensional displacement sensor 1 of FIG. 1, but the reference numerals are changed to 5A, 5B, and 5C to distinguish them.

  The three-dimensional displacement sensors 1A, 1B are arranged on the base plate 11 (see FIG. 1) so that the displacement measurement ends 5A, 5B are substantially perpendicular to the plane center O (see FIG. 1) of the base plate 11 on the top plate of the test stand 32. Screws are fixed using the attachment screw holes 11a. The displacement measuring end 5A is fixed to the upper surface of the support receiving portion 25R. Specifically, for example, the displacement measuring end 5A is welded or adhered and fixed to an attachment member (measurement point) 29A that is a small metal piece, and the attachment member 29A is welded and fixed to the support receiving portion 25R. Similarly, the displacement measurement end 5B is fixed to the upper surface of the support receiving portion 25L of the transmission 23 via an attachment member (measurement point) 29B.

Even if an attempt is made to measure the three-dimensional displacement amount of the engine 21 in the engine mounts 28F and 28R, the protrusion of the outer shape of the upper part of the engine 21 and the equipment and wiring adjacent to the engine 21 become obstructive and cannot be measured directly. Therefore, the displacement measurement end 5C of the three-dimensional displacement sensor 1C is fixed to the upper portion of the engine 21 through a mounting member (measurement point) 29C in the same manner as the displacement measurement end 5A. At this time, the three-dimensional displacement sensor 1C is fixed to the top plate of the test gantry 32 using the mounting screw holes 13d provided in the fixing side surface 13c of the sensor cover 13 (see FIG. 1). That is, the displacement measuring end 5C is obliquely below the plane center O (see FIG. 1) of the base plate 11 of the three-dimensional displacement sensor 1C (when viewed from the vehicle V, the front side is below the plane center O of the three-dimensional displacement sensor 1C on the front side). positioned.
Here, the parts to which the attachment members 29A, 29B, and 29C are attached correspond to “measurement points” described in the claims. In that sense, the attachment members 29A, 29B, 29C themselves fixed to the engine 21 or the transmission 23 may be used as “measurement points” described in the claims.

  The combined body of the engine 21 and the transmission 23 can be regarded as a substantially rigid body. If the three-dimensional displacement amounts of the displacement measuring ends 5A, 5B, and 5C can be measured by the three-dimensional displacement sensors 1A, 1B, and 1C, the engine 21 and the transmission 23 are combined. Therefore, the three-dimensional displacement amount of the support receiving portions 27F and 27R to which the displacement measuring end 5 is not attached can be obtained by calculation.

Here, a method of setting the XYZ coordinate axes of the rectangular coordinate system for calculating the three-dimensional displacement amount of the combined body of the engine 21 and the transmission 23 will be described. For example, the X axis is made to coincide with the rotation center axis 35 of the crankshaft of the engine 21, and the point where the vertical plane including the center of gravity G of the combined body of the engine 21 and the transmission 23 intersects with the X axis is a coordinate in the rectangular coordinate system. The origin (the origin of a right-angle three-dimensional coordinate system) 36 is set, and the Z axis is set perpendicularly from the coordinate origin 36 and the Y axis perpendicular to the X axis and the Z axis from the coordinate origin 36 is set in the horizontal direction in front of the vehicle V.
The angular displacement around the X axis is called roll vibration, the angular displacement around the Y axis is called pitch vibration, and the angular displacement around the Z axis is called yaw vibration. Based on the three-dimensional displacement amounts of the displacement measuring ends 5A, 5B, and 5C measured by the three-dimensional displacement sensors 1A, 1B, and 1C, three-dimensional translational vibration, roll vibration, pitch vibration, and yaw vibration of the coordinate origin 36 are obtained. The components are calculated, and the three-dimensional displacement amounts of the support receiving portions 27F and 27R that cannot directly measure the three-dimensional displacement amount are calculated.
Here, the support receiving portions 25L, 25R, 27F, and 27R correspond to “target points” recited in the claims. Therefore, in the present embodiment, the support receiving portions 25L and 25R are both “measurement points” and “target points” described in the claims.

FIG. 4 is a functional block configuration diagram of the three-dimensional displacement measuring apparatus. As shown in FIG. 4, the three-dimensional displacement measuring device 50 includes three-dimensional displacement sensors 1 </ b> A, 1 </ b> B, 1 </ b> C, a signal preprocessing device 53, and a measurement computer 51. The measurement computer 51 may be an ordinary commercially available notebook personal computer. The measurement computer 51 includes a computer main unit 51a, a display unit 51b composed of a liquid crystal display device, an input device 51c such as a keyboard and a mouse, a storage unit 51d composed of a hard disk device, a CPU 51e, etc. 1 includes a ROM and RAM (not shown), a CPU 51e, ROM, RAM, a bus for connecting the input / output interfaces, and the like.
As shown in FIG. 1, each of the three-dimensional displacement sensors 1A, 1B, and 1C has three wire potentiometers 2, and an output signal from a hall element incorporated therein is a signal preprocessing device 53. The signal is amplified and A / D converted by an individual signal preprocessing circuit 54 and input to the input interface of the measurement computer 51.

Then, the CPU 51e reads out and executes the three-dimensional displacement measurement program stored in advance in the storage unit 51d, and functions as a set of three sets corresponding to the control unit 61 and the three-dimensional displacement sensors 1A, 1B, and 1C. One wire drawing length calculation unit (potentiometer signal acquisition unit) 62, coordinate axis setting unit (coordinate axis setting unit) 64, conversion formula setting unit (conversion formula setting unit) 65, and three-dimensional displacement amount calculation unit (measurement point displacement amount calculation unit) ) 66, a measurement target object three-dimensional coordinate setting unit 67, and a measurement target object three-dimensional displacement analysis unit 70. In addition, the vehicle information acquisition part 63 is included as a function part which CPU51e performs.
As shown in FIG. 4, the three wire drawing length calculation unit 62, the coordinate axis setting unit 64, the conversion formula setting unit 65, and the three-dimensional displacement amount calculation unit 66 as a set of the above-described sets are arranged as shown in FIG. Three sets of A, B, and C systems are prepared corresponding to 1B and 1C.

The measurement object three-dimensional coordinate setting unit 67 includes a coordinate origin setting unit (measurement point coordinate setting unit, target point coordinate setting unit) 67a, a measurement point coordinate setting unit (measurement point coordinate setting unit) 67b, and a target point coordinate setting unit. (Focus point coordinate setting means) 67c is included.
The to-be-measured object three-dimensional displacement analysis unit 70 includes a measurement point three-dimensional coordinate conversion unit (target point displacement amount calculation means) 71 and a target point three-dimensional coordinate displacement calculation unit (target point displacement amount calculation means) 72. . The point-of-interest three-dimensional coordinate displacement calculation unit 72 includes a measurement target object three-dimensional motion analysis unit 72a and a point-of-interest three-dimensional coordinate conversion unit 72b. Incidentally, the measurement point three-dimensional coordinate conversion unit 71 corresponds to the above-described A to C systems, the A-system measurement point three-dimensional coordinate conversion unit 71a, the B-system measurement point three-dimensional coordinate conversion unit 71b, the C-system measurement point three-dimensional. A coordinate conversion unit 71c is included.

(Control unit and initial setting function)
As a first initial setting function, the control unit 61 uses a three-dimensional displacement amount calculation unit 66 of each of the AC systems corresponding to the installation conditions of the three-dimensional displacement sensors 1A, 1B, 1C in a right-angle three-dimensional coordinate system. In order to calculate the three-dimensional displacement amounts of the components in the X, Y, and Z coordinate axis directions (XYZ directions), the respective coordinate axis setting units 64 of the A to C systems respectively change the X, Y, and Z coordinate axis directions. It has a coordinate axis direction setting input function that allows a measurement person to perform setting input using the display unit 51b and the input device 51c, including the + -direction with respect to the coordinate axis direction.

  In addition, as a second initial setting function, the control unit 61 sets the conversion formulas for the A to C systems using the result of the coordinate axis direction setting input function after completion of the operation of the coordinate axis direction setting input function. In the unit 65, the wire drawing length based on the output signal indicating the rotation angle of the wire potentiometer 2 calculated by the three wire drawing length calculation units 62 included in each system is used to determine the wire from the wire drawing length in the initial state. The coefficient of the conversion formula used when the three-dimensional displacement amount calculation unit 66 calculates the change amount of the drawer length as the three-dimensional displacement amount of the component in the X, Y, and Z coordinate axes, Each conversion formula setting unit 65 has a function that enables the measurement input by the measurer using the display unit 51b and the input device 51c.

For this reason, the control unit 61 is connected to the coordinate axis setting unit 64 and the conversion formula setting unit 65 of the A to C systems. The X, Y, and Z directions set by the coordinate axis setting unit 64 are input to the conversion formula setting unit 65 including the + − direction with respect to each direction.
Incidentally, the + − direction with respect to each of the X, Y, and Z directions is consistent with the + − direction with respect to each direction in the coordinate origin setting unit 67a described later.
The coefficient of the conversion formula set by the conversion formula setting unit 65 of each of the A to C systems is input to the three-dimensional displacement amount calculation unit 66 of each system.
For each of the displacement measuring ends 5A, 5B, and 5C, a conversion formula is individually prepared. From the length of the ridge line of the triangular pyramid formed by the three wires 3 of each three-dimensional displacement sensor 1, the conversion formula is calculated. The three-dimensional positions of the vertexes of the displacement measuring ends 5A, 5B, and 5C can be uniquely identified, and can be easily converted into XYZ right-angle three-dimensional coordinates using a conversion formula. However, the shape of the triangular pyramid in the initial state of each of the displacement measuring ends 5A, 5B and 5C is different, and the mounting direction of the three-dimensional displacement sensor 1 may be different, so this coordinate axis direction setting input function is necessary. become.

  As a third function of the initial setting, the control unit 61 performs the coordinate origin 36 in the XYZ right-angle three-dimensional coordinate system of the object to be measured, here, the combination of the engine 21 and the transmission 23, and the X, Y, Z In order to set the coordinate axis including the positive and negative directions, it is possible to perform setting input by the measurer using the display unit 51b and the input device 51c in the coordinate origin setting unit 67a of the measurement object three-dimensional coordinate setting unit 67. It has a function to do. Therefore, the control unit 61 is connected to the coordinate origin setting unit 67a. The coordinate origin 36 set in the coordinate origin setting unit 67a and the directions of the X, Y, and Z coordinate axes including the positive and negative directions are measured. The point coordinate setting unit 67b, the point of interest coordinate setting unit 67c, the measurement point three-dimensional coordinate conversion unit 71, and the point of interest three-dimensional coordinate displacement calculation unit 72 are input (see FIG. 3).

For example, the center of gravity G of the combined body of the engine 21 and the transmission 23, which is the object to be measured, is obtained by the CAD system, the rotation center axis 35 of the crankshaft in the vehicle-mounted state is defined as the X axis, and the center of gravity G is included. The point where the vertical plane intersects perpendicularly with the X axis is set as the coordinate origin 36 of right-angle three-dimensional coordinates. Here, the left direction of the vehicle body from the coordinate origin 36 is defined as the X direction (+) direction, and the right direction of the vehicle body from the coordinate origin 36 is defined as the X direction (−) direction.
Then, a Y coordinate axis extending back and forth in the horizontal direction from the coordinate origin 36 in the vertical plane including the center of gravity G is set. For example, the front direction is the Y direction (+) and the rear direction is the Y direction (−) direction. A Z coordinate axis extending vertically from the coordinate origin 36 in the vertical plane including the center of gravity G is set. For example, the upward direction is the Z direction (+) and the downward direction is the Z direction (−) direction.

As the fourth function of the initial setting, the control unit 61 uses the three-dimensional coordinates of the initial position of the measurement point of the measurement target object (corresponding to the attachment members 29A, 29B, and 29C in FIG. 3) as the measurement point coordinate setting unit. 67b has a function that enables the measurement input by the measurer using the display unit 51b and the input device 51c. Therefore, the control unit 61 is connected to the measurement point coordinate setting unit 67b, and the three-dimensional coordinates of the initial position of the attachment member 29A (see FIG. 3) set in the measurement point coordinate setting unit 67b are A-system measurement points. The three-dimensional coordinates of the initial position of the attachment member 29B (see FIG. 3) input to the three-dimensional coordinate conversion unit 71a are input to the B-system measurement point three-dimensional coordinate conversion unit 71b and the three-dimensional of the initial position of the attachment member 29C. The coordinates are input to the C-system measurement point three-dimensional coordinate conversion unit 71c, and the three-dimensional coordinates of the initial positions of the attachment members 29A, 29B, and 29C that are measurement points are input to the target point three-dimensional coordinate displacement calculation unit 72. The
The input setting of the three-dimensional coordinates of the attachment members 29A, 29B, and 29C is easily calculated by setting the origin and the coordinate axis as described above in the CAD system, and the measurer can easily perform the input by inputting the data.

As a fifth initial setting function, the control unit 61 sets the three-dimensional coordinates of the initial position of the point of interest of the measurement target object (in the present embodiment, the support receiving portions 27F and 27R) as the measurement point coordinate setting unit 67b. 1 has a function that enables a measurement person to perform setting input using the display unit 51b and the input device 51c. Therefore, the control unit 61 is connected to the point-of-interest coordinate setting unit 67c.
In addition, since the three-dimensional coordinates of the initial positions of the attachment members 29A, 29B, and 29C, which are measurement points, are input from the measurement point coordinate setting unit 67b to the target point coordinate setting unit 67c, the measurement point input by the measurer is as follows. In the case where the measurement point and the point of interest are the same part, the three-dimensional coordinates can be copied and pasted by the input device 51c while viewing the screen display of the display unit 51b.
The three-dimensional coordinates of the initial position of the target point set in the target point coordinate setting unit 67c are input to the target point three-dimensional coordinate displacement calculation unit 72.
The input setting of the three-dimensional coordinates of the point of interest is easily calculated by setting the above-described origin and coordinate axes in the CAD system, and the measurer can easily perform the input by inputting the data.

  The three-dimensional displacement sensors 1A, 1B are set by the control unit 61 including the directions of the X, Y, and Z coordinate axes (XYZ directions) of the three-dimensional displacement sensors 1A, 1B, and 1C with respect to the directions of the respective coordinate axes. , 1C based on the output signal, setting of a conversion formula for calculating the amount of displacement from the initial position of each component in the XYZ directions, the coordinate origin 36 of the rectangular coordinate system of the object to be measured, and the X, Y, including the + − direction, When the setting of the Z direction, the setting of the three-dimensional coordinates of the attachment members 29A, 29B, and 29C, which are measurement points, and the setting of the three-dimensional coordinates of the point of interest of the object to be measured are completed, the initial setting operation ends. After that, the control unit 61 uses the display unit 51b and the input device 51c by the measurer to input the storage command signal for the initial position and the measurement start signal. 62, a measurement start command signal is input to the three-dimensional displacement calculation unit 66 and the measurement target object three-dimensional displacement analysis unit 70 following the storage command signal of the initial position. Each wire drawing length calculator 62, three-dimensional displacement calculator 66, and three-dimensional displacement analyzer 70 to be measured receive an initial position storage command signal and store initial values as necessary. The calculation to be described later is started in response to the measurement start command signal.

(Wire drawing length calculator)
The wire drawing length calculation unit 62 receives an output signal from each wire potentiometer 2 that has been amplified by the signal preprocessing circuit 54 and converted into a digital signal, and outputs an output signal indicating the amount of angular displacement of the wire potentiometer 2. Then, it is converted into a wire drawing amount from the wire drawing hole 2a and output to the three-dimensional displacement amount calculation unit 66. This calculation is well known and will be omitted. Incidentally, the pulley of the wire potentiometer 2 in the present embodiment corresponds to a displacement amount of approximately 90 degrees in the extension direction or the contraction direction from the initial position, and does not assume a large displacement amount.

(Three-dimensional displacement calculator)
The three-dimensional displacement amount calculation unit 66 of each of the systems A to C uses the wire drawing amounts from the three wire drawing length calculation units 62 when receiving the initial position storage command signal from the control unit 61 as the initial position. The three-dimensional displacement amounts from the initial positions in the X, Y, and Z directions with respect to the wire drawing amounts from the three wire drawing length calculation units 62 after the start of measurement are calculated using the conversion formula input from the conversion formula setting unit 65. Calculation is performed at a predetermined cycle using the coefficient. The three-dimensional displacement amount calculated by the three-dimensional displacement amount calculation unit 66 of each of the systems A to C is transferred to the measurement point three-dimensional coordinate conversion units 71a, 71b, 71c of the system of the measurement point three-dimensional coordinate conversion unit 71. Entered.

(Measurement point 3D coordinate conversion unit)
The measurement point three-dimensional coordinate conversion units 71a, 71b, 71c of the measurement point three-dimensional coordinate conversion unit 71 have three-dimensional displacements of the respective systems of A to C as the three-dimensional coordinates of the measurement points at the initial position. The three-dimensional displacement amount input from the amount calculation unit 66 is added and input to the point-of-interest three-dimensional coordinate displacement calculation unit 72 as change transition data of the measurement point three-dimensional coordinate.
The change transition data of the measurement point three-dimensional coordinates calculated by the measurement point three-dimensional coordinate conversion units 71a, 71b, 71c of the A to C systems is output to the storage unit 51d together with the time data, and stored in time series. Is done.

(Point of interest 3D coordinate displacement calculator)
The point-of-interest three-dimensional coordinate displacement calculation unit 72 includes change transition data of the measurement point three-dimensional coordinates calculated by the measurement point three-dimensional coordinate conversion units 71a, 71b, 71c of the A to C systems, and a measurement point coordinate setting unit 67b. Based on the three-dimensional coordinates of the initial positions of the attachment members 29A, 29B, and 29C, which are measurement points input from the X-, Y-, and Z-directions of the coordinate origin 36 in the three-dimensional motion analysis unit 72a to be measured. The displacement component of each of the translational displacement component, the roll vibration around the X axis, the pitch vibration around the Y axis, and the yaw vibration around the Z axis is calculated. A translational displacement component in the X, Y, and Z directions of the coordinate origin 36 calculated by the three-dimensional motion analysis unit 72a to be measured, roll vibration around the X axis, pitch vibration around the Y axis, and yaw around the Z axis. The displacement component of each vibration is input to the target point three-dimensional coordinate conversion unit 72b. Further, the translational displacement component in the X, Y, and Z directions of the coordinate origin 36 calculated by the three-dimensional motion analysis unit 72a to be measured, roll vibration around the X axis, pitch vibration around the Y axis, and around the Z axis. The displacement component of each yaw oscillation is output to the storage unit 51d together with the time data, and is stored and stored in time series.

  The translational displacement component of the coordinate origin 36 in the X, Y, and Z directions, the roll vibration around the X axis, the pitch vibration around the Y axis, and the yaw vibration around the Z axis in the measured object three-dimensional motion analysis unit 72a. Can be easily calculated based on the change transition data of the measurement point three-dimensional coordinates calculated by the measurement point three-dimensional coordinate conversion units 71a, 71b, 71c of the A to C systems.

The point-of-interest three-dimensional coordinate conversion unit 72b includes a translational displacement component in the X, Y, and Z directions of the coordinate origin 36 calculated by the three-dimensional motion analysis unit 72a to be measured, roll vibration around the X axis, and Y axis. Displacement component of each of the pitch vibration around the Z-axis and the yaw vibration around the Z-axis, and the tertiary of the initial position of the points of interest different from the attachment members 29A, 29B, and 29C (here, the support receiving portions 27F and 27R in FIG. 3 correspond) Based on the original coordinates, the three-dimensional displacement amounts in the X, Y, and Z directions of the support receiving portions 27F and 27R that are the points of interest are calculated. The three-dimensional displacement amount calculated by the point-of-interest three-dimensional coordinate conversion unit 72b of the support receiving portions 27F and 27R that are the point of interest that is not the measurement point is output to the storage unit 51d together with the time data, and is stored and stored in time series. .
The three-dimensional displacement amounts in the X, Y, and Z directions of the support receiving portions 27F and 27R that are the points of interest are the three-dimensional coordinates of the initial positions of the support receiving portions 27F and 27R and the X, Y, and Z directions of the coordinate origin 36. Can be easily calculated from the displacement components of the translational displacement component and the roll vibration around the X axis, the pitch vibration around the Y axis, and the yaw vibration around the Z axis.
The three-dimensional displacement amount of the support receiving portions 25L and 25R to which the attachment members 29A and 29B that are the focus points and the measurement points are attached is obtained from the three-dimensional displacement amount calculation unit 66 of the A and B systems. What is input to the displacement analysis unit 70 is used as it is.

In the present embodiment, the vehicle V is placed on a road simulator that is a vehicle test device, and various traveling states are given to the front wheels that are driving wheels, for example. The torque is changed, the gear position of the transmission 23 is changed, the brake operation is performed, and the vehicle running situation is changed to perform an endurance test. The three-dimensional displacement measuring device 50 is an object to be measured according to the running situation of the vehicle. The three-dimensional displacement amounts of the support receiving portions 25L, 25R, 27F, and 27R of the combined body of the engine 21 and the transmission 23 are measured. For this purpose, the measurement computer 51 sends to the input interface device 55, for example, an engine speed signal Ne of the vehicle V, an accelerator opening signal S _Ac , a gear shift position signal S _Sft of the transmission 23, and a wheel speed signal S _{V of the} drive wheels. Vehicle information such as a brake operation signal S _B indicating the amount of depression of the brake and a drive torque signal S _TD indicating the drive torque of the drive wheels detected on the road simulator side is input, and a preprocessing circuit corresponding to each input signal 56A, 56B, 56C, 56D, 56E, and 56F are input to the input interface of the measurement computer 51, acquired by the vehicle information acquisition unit 63, and stored in the storage unit 51d together with the time data.

  When the measurement is completed, the measurer inputs the measurement end to the control unit 61 using the display unit 51b and the input device 51c, and the control unit 61 includes a wire drawing length calculation unit 62, a three-dimensional displacement amount calculation unit 66, A measurement end command is issued to the measurement point three-dimensional coordinate conversion unit 71 and the point-of-interest three-dimensional coordinate displacement calculation unit 72, and data storage in each calculation function and the storage unit 51d is stopped.

  During the endurance test, the control unit 61 causes the display unit 51b to display a time-series change in the three-dimensional displacement amount of each measurement point (attachment members 29A, 29B, and 29C), and a point of interest that is not included in the measurement point (support receiver 27F, 27R), the time-series change of the three-dimensional displacement amount, the translational displacement component of the coordinate origin 36 in the X, Y, and Z directions, the roll vibration around the X axis, the pitch vibration around the Y axis, and the Z axis around You may make it display the graph of the time series change of the displacement amount component of each yaw vibration with the vehicle information acquired in the vehicle information acquisition part 63. FIG.

According to the present embodiment, as a configuration in which a telescopic connecting rod provided with a displacement detector for detecting expansion / contraction displacement as described in Patent Document 1, and a configuration in which its base side is rotatable around a vertical axis and a horizontal axis, Without the complicated configuration of providing the first and second angle detectors to detect the angular displacement around the vertical axis and the horizontal axis, it is possible to simply measure the three-dimensional displacement amount at one measurement point. By simply measuring the length of the wire 3 pulled out of the three wire potentiometers 2, the three-dimensional position of the displacement measuring end 5 of the apex of the triangular pyramid constituted by the three wires 3 can be uniquely identified. It can be easily converted into XYZ right-angle three-dimensional coordinates using a conversion formula.
Accordingly, the inertia of the three wires 3 (see FIG. 1) is extremely small, and the high-speed vibration displacement of the object to be measured can be measured more accurately than the technique of Patent Document 1. Also, using three wire potentiometers 2 (see FIG. 1), the three-dimensional displacement measuring device 50 is much cheaper than the conventional non-contact type using ultrasonic waves, light, laser light, etc. Can be manufactured.

Further, as illustrated in FIG. 3, at least three or more predetermined measurement points (in this embodiment, attachment members 29 </ b> A, 29 </ b> B, 29 </ b> C) of the measurement target object are provided for the measurement target object. Since the displacement amount is measured by the three-dimensional displacement sensor 1 (1A, 1B, 1C), the displacement amount at the measurement points in the X direction, the Y direction, and the Z direction of the set right-angle three-dimensional coordinate system can be calculated. Further, the X coordinate, Y coordinate, and Z coordinate of the initial three-dimensional coordinate system at the initial position of the predetermined measurement point of at least three or more objects to be measured are input, and the initial three-dimensional coordinate system of the initial position of the point of interest is input. Since the X coordinate, the Y coordinate, and the Z coordinate are also input, the amount of displacement in the X direction, Y direction, and Z direction of the orthogonal three-dimensional coordinate system of the target point different from the measurement point by the target point three-dimensional coordinate displacement calculation unit 72 Is calculated from the relative positional relationship of the right-angle three-dimensional coordinate system between the measurement point and the point of interest and the amount of displacement in the X-direction, Y-direction, and Z-direction of the right-angle three-dimensional coordinate system at at least three measurement points. can do.
Accordingly, it interferes with the object to be measured due to the external shape of the object to be measured, or is externally mounted on the object to be measured, etc. (equipment, pipes, meters arranged around the engine 21 and the transmission 23) The amount of displacement in the X, Y, and Z directions of the right-angle three-dimensional coordinate system of the point of interest (support receiving portions 27F, 27R) that cannot be selected as a measurement point due to interference with the wire, etc. Can be easily obtained by calculation.

In the present embodiment, the object to be measured is an object in which the engine 21 and the transmission 23 of the vehicle V are integrally coupled as shown in FIG. The X axis of the right-angle three-dimensional coordinate system is the rotation center axis 35 of the crankshaft when the engine 21 is stopped, the coordinate origin 36 is perpendicular to the X axis, and the engine 21 and the transmission 23 are integrated. The barycentric point G of the coupled objects is set at the intersection of the vertical plane and the X axis. The Z axis of the right-angle three-dimensional coordinate system is a vertical axis that is orthogonal to the X axis and the coordinate origin 36, and a horizontal axis that is orthogonal to the Y axis, X axis, and Z axis and the coordinate origin 36.
Therefore, in the point-of-interest three-dimensional coordinate displacement calculation unit 72, the X-direction, Y-direction, and Y-direction of the coordinate origin 36 are calculated from the displacement amounts in the X-direction, Y-direction, and Z-direction of the right-angle three-dimensional coordinate system at at least three measurement points. It is possible to calculate the translational displacement amount component in the Z direction and the displacement amount components of the roll vibration around the X axis, the pitch vibration around the Y axis, and the yaw vibration around the Z axis.

  For example, the support receiving portions 25L, 25R, which are supported by the vehicle body by elastically absorbing vibrations through the engine mounts 26L, 26R, 28F, and 28R, in which the engine 21 and the transmission 23 are integrally coupled. When it is desired to measure the amount of displacement of the 27F and 27R in the engine operating state, the amount of displacement of the support receiving portions 27F and 27R cannot be directly measured by equipment, piping, instrumentation lines, and the like arranged around the engine 21 and the transmission 23. In such a case, the support receiving portions 27F and 27R are used as the target points, and the three-dimensional displacement amounts of the support receiving portions 27F and 27R in the engine operating state can be calculated by the target point three-dimensional coordinate displacement calculation unit 72. Then, the three-dimensional displacement amount applied to the engine mounts 28F and 28R can be calculated. At this time, not only the translational displacement amount component but also the roll vibration around the X axis, the pitch vibration around the Y axis, the yaw vibration around the Z axis, and the respective displacement amount components can be calculated. , 26R, 28F, and 28R in the durability test analysis, an improvement direction can be obtained in consideration of the displacement component applied to each engine mount 26L, 26R, 28F, and 28R.

Note that the XYZ axes of the three-dimensional rectangular coordinate system of the present embodiment are set as shown in FIG. 3, but are not limited thereto, and the center of gravity G is the coordinate origin 36 of the rectangular three-dimensional coordinate system, and the center of gravity The axis parallel to the rotation center axis of the crankshaft passing through G is the X axis, and the Y axis is taken in the forward direction horizontally from the center of gravity G of the vehicle in a plane including the center of gravity G perpendicular to the X axis. Alternatively, the Z axis may be set.
Further, as an example of the object to be measured according to the present embodiment, the combined body of the engine 21 and the transmission 23 of the vehicle V is set horizontally and the front wheel drive system is used. However, the present invention is not limited to this.

1,1A, 1B, 1C 3D displacement sensor (3D displacement measurement unit)
2 Wire potentiometer (potentiometer)
2a Wire drawing hole 3 Wire 5, 5 ', 5A, 5B, 5C Displacement measurement end 11 Base plate 11a Mounting screw hole 11c Reference side 13 Sensor cover 13a Wire drawing hole 13c Fixing side surface 13d Mounting screw hole 21 Engine 23 Transmission (Transmission) )
25L, 25R support receiving part (measurement point, point of interest)
27F, 27R Support receiving part (point of interest)
26L, 26R, 28F, 28R Engine mount 29A, 29B, 29C Mounting member (measurement point)
31L, 31R Frame 32 Test stand 35 Crankshaft rotation center axis 36 Coordinate origin (origin of right-angle 3D coordinate system)
50 Three-dimensional Displacement Measuring Device 51 Measuring Computer 51a Computer Body 51b Display Unit (Input Means)
51c Input device (input means)
51d storage unit 62 wire drawing length calculation unit (potentiometer signal acquisition means)
63 Vehicle information acquisition unit 64 Coordinate axis setting unit (coordinate axis setting means)
65 Conversion formula setting section (Conversion formula setting means)
66 Three-dimensional displacement calculator (measurement point displacement calculator)
67 object to be measured three-dimensional coordinate setting unit 67a coordinate origin setting unit (measuring point coordinate setting means, point of interest coordinate setting means)
67b Measurement point coordinate setting unit (measurement point coordinate setting means)
67c Point of Interest Coordinate Setting Unit (Point of Interest Coordinate Setting Unit)
70 Measurement Object 3D Displacement Analysis Unit 71 Measurement Point 3D Coordinate Conversion Unit (Point of Interest Displacement Calculation Unit)
71a A-system measurement point three-dimensional coordinate conversion unit 71b B-system measurement point three-dimensional coordinate conversion unit 71a C-system measurement point three-dimensional coordinate conversion unit 72 Focus point three-dimensional coordinate displacement calculation unit (focus point displacement amount calculation means)
72a Object to be measured 3D motion analysis unit 72b Point of interest 3D coordinate conversion unit G Center of gravity O Plane center V Vehicle

Claims (4)

Three potentiometers having a pulley around which a wire is wound and detecting the length of the wire drawn out based on the rotation angle of the pulley that rotates when the wire is drawn out have a predetermined circumferential angle. A three-dimensional displacement measuring unit mounted on a single support substrate at an interval; and potentiometer signal acquiring means for acquiring respective output signals from the three potentiometers of the three-dimensional displacement measuring unit. A three-dimensional displacement measuring device,
An input means that can be input by the measurer,
Each of the three potentiometers of the three-dimensional displacement measuring unit is joined at one point to the leading end of the wire drawing portion to form a displacement measuring end, and the three wires form a triangular pyramid, and the displacement The measurement end is fixed to a predetermined measurement point of the object to be measured,
Coordinate axis setting means for setting the orientation of each coordinate axis of the XYZ right-angle three-dimensional coordinate system with respect to the initial position of the predetermined measurement point of the measurement object according to the input from the input means by the measurer;
In accordance with the input from the input means by the measurer, based on the output signals from the three potentiometers, the set orthogonal three-dimensional coordinate system from the initial position of the predetermined measurement point of the object to be measured. A conversion formula setting means for setting a conversion formula to be converted into each displacement amount in the X direction, the Y direction, and the Z direction;
Using the conversion formula set by the conversion formula setting means, based on the output signals from three potentiometers, the right-angle three-dimensional of a predetermined measurement point of the object to be measured from the initial position A measuring point displacement amount calculating means for calculating a displacement amount in the X direction, the Y direction, and the Z direction of the coordinate system;
A three-dimensional displacement measuring device comprising: Furthermore, with respect to the object to be measured that can be assumed to be a three-dimensional solid body, the set right-angle three-dimensional coordinate system relating to the initial positions of predetermined measurement points of the at least three or more objects to be measured. Measuring point coordinate setting means for setting the X coordinate, the Y coordinate, and the Z coordinate according to the input from the input means by the measurer,
The set right-angle three-dimensional coordinates relating to the initial position of a predetermined point of interest of the measurement target object for which respective displacement amounts in the X-direction, Y-direction, and Z-direction of the set right-angle three-dimensional coordinate system are to be obtained. Point-of-interest coordinate setting means for setting the X coordinate, Y coordinate, and Z coordinate of the system according to the input from the input means by the measurer;
Of the predetermined points of interest of the set object to be measured, the set points that are different from the set predetermined measurement points of the object to be measured at least three or more. Based on the relative position of the set X-, Y-, and Z-coordinates of the set three-dimensional right-angle coordinate system with at least three predetermined measurement points of the measurement object, from the initial position of the target point A point-of-interest displacement amount calculating means for calculating a displacement amount in the X direction, Y direction, and Z direction of the set right-angle three-dimensional coordinate system;
The three-dimensional displacement measuring apparatus according to claim 1, comprising: The object to be measured is one in which a vehicle engine and a transmission are integrally coupled,
The X axis of the set right-angle three-dimensional coordinate system is a rotation center axis of the crankshaft when the engine is stopped, and the Z axis is the X axis included in a vertical plane perpendicular to the X axis. The Y axis is a horizontal axis perpendicular to the X axis and the Z axis included in the vertical plane,
The predetermined target point of the object to be measured is a part where the engine and the transmission are supported by a vehicle body,
The point-of-interest displacement calculation means considers at least the roll vibration around the X axis due to the rotation of the engine, and the X direction of the set right-angle three-dimensional coordinate system from the initial position of the point of interest, Y The three-dimensional displacement measuring apparatus according to claim 2, wherein a displacement amount in the direction and the Z direction is calculated. The Y-axis and the Z-axis of the set right-angle three-dimensional coordinate system are perpendicular to the X-axis, and include the center of gravity of the engine and the transmission integrally coupled therein. Set in the vertical plane,
The point-of-interest displacement calculation means is a translational displacement component in the X, Y, and Z directions of the origin of the set right-angle three-dimensional coordinate system with respect to a predetermined point of interest of the measurement object; 4. The three-dimensional displacement measuring apparatus according to claim 3, wherein displacement amount components of roll vibration around the X axis, pitch vibration around the Y axis, and yaw vibration around the Z axis are calculated.

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