JP2004184151A - Non-contact engine displacement analysis method and apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a non-contact displacement analysis method and an apparatus for finding a fundamental cause of a belt squeal. <P>SOLUTION: Locations of at least three arbitrary points (P1, P2, P3), (P4, P5, P6) of an AC generator pulley 41 and an air conditioner pulley 42 in various pulleys mounted around an engine W and provided to stretch an accessory belt 40, are non-contactly measured while the engine stops. Plane data of the pulleys 41, 42 are created from point data. A quantity of displacement or inclination as a relative location relationship between the plane data and preset reference plane data is found. Existence of the belt squeal is previously verified at an experimental stage. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a non-contact type engine displacement analysis method and apparatus for verifying in advance whether or not a squeal of a belt stretched by various pulleys mounted around an engine has occurred.
[0002]
[Prior art]
Conventionally, the determination of the presence or absence of squeal of the belt mounted on the engine mounted on the new model, etc. is performed by measuring the relative displacement and inclination of various pulleys with a scale while the engine alone is stationary, and This was done depending on whether or not it was within the reference value. However, when the engine is actually mounted on the vehicle and test-running, there are many engines that generate belt squeal even though they are within the reference value, and the relative displacement and inclination of various pulleys and belt squeal A lot of man-hours were required to analyze the relationship.
[0003]
Therefore, an electromagnetic pickup is provided between the crank pulley, the power steering pulley, and the air conditioner pulley on which the accessory belt is stretched, and an electromagnetic pickup that detects the rotation speed of the crank pulley and the air conditioner pulley and the traveling speed of the accessory belt. A microphone is installed to detect belt noise, analyze the correlation of belt noise from the slip rate calculated from the accessory belt tension, the rotation speed of the air conditioner pulley, and the travel speed of the accessory belt, and increase belt tension to increase belt noise. There is known a method for preventing such a problem (see, for example, Patent Document 1).
[0004]
[Patent Document 1]
JP-A-1-288656
[Problems to be solved by the invention]
However, in the method described in Japanese Patent Application Laid-Open No. 1-288656, only the tension of the belt is adjusted, and it is impossible to reliably eliminate the squeal of the belt.
[0006]
SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the related art, and has as its object to provide a non-contact type engine displacement analysis method capable of investigating a root cause of belt squeal. And a device.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention according to claim 1 has a structure in which at least three arbitrary positions of one or more pulleys among various pulleys attached around the engine and tensioning the belt are set in a state where the engine is stationary. Measurement is made by contact, plane data of each pulley is created from these point data, and a relative positional relationship between these plane data and preset reference plane data is obtained.
[0008]
According to a second aspect of the present invention, in the non-contact type engine displacement analysis method according to the first aspect, a relative positional relationship between the plane data and the reference plane data is determined by a shift amount of the plane data with respect to the reference plane data. And / or the amount of tilt.
[0009]
According to a third aspect of the present invention, in an engine driving state, a time-series displacement of one axis at a certain point of one or more pulleys is measured in a non-contact manner among various pulleys attached around the engine and extending a belt. The purpose of this study is to investigate the cause of belt squeal based on the time-series displacement data.
[0010]
According to a fourth aspect of the present invention, in an engine driving state, a time series displacement of one axis of a runout at a certain point of a belt stretched by various pulleys mounted around the engine is measured in a non-contact manner, and these time series displacements are measured. The cause of the belt squeal is determined from the data.
[0011]
According to a fifth aspect of the present invention, there is provided a measuring unit for three-dimensionally measuring the position of an arbitrary point of various pulleys attached around an engine and stretching a belt in a non-contact manner, and the point data of each pulley measured by the measuring unit. A measurement control unit that creates plane data of each pulley and calculates a relative positional relationship with reference plane data set in advance, and a display unit that displays processing results of the measurement control unit.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Here, FIG. 1 is a schematic configuration diagram of a non-contact type engine displacement analysis device according to the present invention, FIG. 2 is a front view thereof, FIG. 3 is a side view thereof, and FIGS. 4 to 6 are non-contact type engine according to the present invention. It is explanatory drawing of a displacement analysis method.
[0013]
As shown in FIG. 1, a non-contact type engine displacement analysis device according to the present invention can be moved to a desired position and can be positioned and fixed, and a three-dimensional measuring machine (XY, A measurement unit 2 having a function as three orthogonal axes of Z), a measurement control unit 3 for exchanging signals with the measurement unit 2 and calculating the amounts of displacement and inclination of various pulleys, and processing by the measurement control unit 3 The display unit 4 displays the measured results.
[0014]
As shown in FIGS. 2 and 3, the moving unit 1 fixes the transport roller 12 and the base column 13 to the lower surface of the substrate 10 via a pair of first base plates 11, and attaches the second base plate to the rear surface of the first base plate 11. 14, a pair of third base plate 15 and fourth base plate 16 are fixed, a moving handle 17 is fixed on the upper surface of the fourth base plate 16, and a base support 18 is fixed on the lower surface, and a pair of support plates 19 are fixed on the upper surface of the substrate 10. And a base plate 20 is fixed to the upper surface of the support plate 19.
[0015]
As shown in FIGS. 2 and 3, the measuring unit 2 engages with a Y-axis rail 21 laid on a base plate 20 and guide grooves 22 formed on both side surfaces of the Y-axis rail 21 and a ball screw (not shown). ), A Y-axis moving member 24 moved in the Y-axis direction by a pulse motor 23, a Z-axis rail 25 fixed to the Y-axis moving member 24 perpendicular to the Y-axis rail 21, and formed on both side surfaces of the Z-axis rail 25. A Z-axis moving member 28 that engages with the guide groove 26 and moves in the Z-axis direction by a ball screw (not shown) and a pulse motor 27; and a laser displacement sensor that is attached to the Z-axis moving member 28 and measures a distance in the X-axis direction. Consists of 29.
[0016]
On the X-axis, the position of the exit of the laser beam emitted by the laser displacement sensor 29 is the original position, and on the Y-axis, the base end of the Y-axis rail 21 on the side where the pulse motor 23 is mounted is the original position. , The base end of the Z-axis rail 25 on the Y-axis moving member 24 side is the original position.
[0017]
Therefore, the coordinate value (X, Y, Z) of the measurement point of the pulley to be measured is the distance from the exit of the laser beam emitted by the laser displacement sensor 29 for the value of X, and Y for the value of Y. The distance calculated from the number of pulses required to move the Y-axis moving member 24 by the pulse motor 23 from the original position of the axis rail 21 until the laser beam of the laser displacement sensor 29 irradiates the measurement point of the pulley is obtained. The value is a distance converted from the number of pulses required to move the Z-axis moving member 28 by the pulse motor 27 from the original position of the Z-axis rail 25 until the laser beam of the laser displacement sensor 29 irradiates the measuring point of the pulley. It becomes.
[0018]
As shown in FIG. 1, the measurement control unit 3 operates the laser displacement sensor 29 and outputs an analog signal of the distance in the X-axis direction as an analog signal, and a contact board for instructing the amplifier unit 30 to emit laser light. 31, an A / D conversion board 32 for converting an analog signal output by the amplifier unit 30 into a digital signal, a control board 33 for driving the pulse motors 23 and 27, and a PC (personal computer) 34 for executing a measurement control program Consists of
[0019]
The PC 34 executes the measurement control program, controls the contact board 31 and the control board 33, and creates plane data of each pulley from coordinate values (point data) of three points of each pulley measured by the measuring unit 2. Then, the relative positional relationship between the plane data and the reference plane data, for example, the shift amount and / or the inclination amount of the plane data with respect to the reference plane data is calculated.
[0020]
The display unit 4 displays the relative positional relationship (shift amount, tilt amount) of each pulley with point data, plane data, and reference plane data. In addition, one-axis time-series displacement data at a certain point on each pulley, and one-axis time-series displacement data at a certain point on a belt stretched by each pulley can be displayed.
[0021]
The operation of the non-contact type engine displacement analysis method and apparatus according to the present invention configured as described above will be described.
The relative position of the AC generator pulley 41 of the engine W and the air conditioner compressor pulley 42 in order to verify whether the squeal of the accessory belt 40 shown in FIG. When measuring the relationship, the non-contact type engine displacement analysis device is positioned and fixed by the base posts 13 and 18 so as to face the stationary engine W positioned and mounted on the engine carrier 43. In this state, the rotation axes of the pulleys 41 and 42 are substantially parallel to the X-axis direction which is the measurement direction of the laser displacement sensor 29.
[0022]
First, in order to set the reference plane data, the pulse motors 23 and 27 are driven to move the Y-axis moving member 24 and the Z-axis moving member 28, and the laser light of the laser displacement sensor 29 is changed as shown in FIG. For example, three points (R1, R2, R3) are measured by irradiating any three points (R1, R2, R3) of the water pump pulley 44. Then, reference plane data is created from the obtained point data of the three points (R1, R2, R3). In the embodiment of the present invention, the reference plane data is created by the water pump pulley 44, but other pulleys on which the accessory belt 40 is stretched may be used as long as the reference plane is guaranteed.
[0023]
Next, similarly, three points (P1, P2, P3) and (P4, P5, P6) of the arbitrary points (P1, P2, P3) of the AC generator pulley 41 and the air conditioner compressor pulley 42 are irradiated with the laser light of the laser displacement sensor 29. , P2, P3) and (P4, P5, P6) are measured. Then, plane data of the AC generator pulley 41 and the air conditioner compressor pulley 42 is created from the obtained point data of the three points (P1, P2, P3) and (P4, P5, P6).
[0024]
Next, the plane data of the AC generator pulley 41 and the plane data of the air conditioner compressor pulley 42 are respectively compared with the reference plane data to determine a relative positional relationship. The relative positional relationship may be, for example, a deviation amount between the reference plane data and the plane data of each pulley 41, 42, an inclination amount of the plane data of each pulley 41, 42 with respect to the reference plane data, and the like.
[0025]
Therefore, as a reference value at which the belt squeal does not occur, for example, a deviation amount: 0.3 mm or less and an inclination amount: 0.5 ° or less are set in advance, and the measured plane data of the AC generator pulley 41 and the air conditioner compressor pulley 42 are set. The display unit 4 displays the position with respect to the reference plane data.
[0026]
For example, if the measured inclination amount of the AC generator pulley 41 is 0.89 °, it is known that the measured value exceeds the reference value of 0.5 °, so the occurrence of belt squeal can be confirmed in advance in the prototype stage. Thus, man-hours required for engine quality aging can be reduced.
[0027]
Next, the analysis can be performed while confirming the belt squeal while the engine W is actually operated.
For example, when the engine W is operated with the laser displacement sensor 29 set so as to irradiate the laser beam of the laser displacement sensor 29 vertically to the point P4 of the air conditioner compressor pulley 42, the air conditioner compressor pulley 42 shakes. As shown in FIG. 5, whether or not there is a change can be determined from time-series displacement data that periodically fluctuates at the point P4 output from the laser displacement sensor 29.
[0028]
From the amount of run-out of the air conditioner compressor pulley 42, the fundamental cause of belt squeal can be determined. Possible causes of the air conditioner compressor pulley 42 swaying include manufacturing errors in the shaft hole diameter of the pulley and the shaft diameter of the rotating shaft, poor centering of the pulley, and deformation of the pulley or shaft.
[0029]
Also, as shown in FIG. 6, the engine is set in a state where the laser displacement sensor 29 is set so that the laser beam of the laser displacement sensor 29 is vertically irradiated on a certain point of the accessory belt 40 (for example, between the pulleys). When W is operated, whether or not the accessory belt 40 is running can be determined from the time-series displacement data of the laser displacement sensor 29 which periodically changes at a certain point.
[0030]
The fundamental cause of belt squeal can be determined from the amount of run-out of the accessory belt 40. Possible causes of the rotating accessory belt 40 oscillating at a certain point include uneven thickness of the belt and insufficient tension of the belt.
[0031]
In addition, while the engine W is actually operated, the fundamental cause of the belt squeal can be determined from the time-series displacement data of the runout of the pulleys 41 and 42 and the runout of the accessory belt 40.
[0032]
【The invention's effect】
As described above, according to the first or second aspect of the present invention, the presence or absence of occurrence of belt squeal can be verified in advance in the prototype stage, so that man-hours required for engine quality aging can be reduced.
[0033]
According to the third or fourth aspect of the present invention, it is possible to determine the fundamental cause of belt squeal.
[0034]
According to the invention according to claim 5, since it can be easily set to the engine, it is possible to verify whether belt squeal has occurred or to investigate the fundamental cause of belt squeal at the prototype stage, This can contribute to a reduction in man-hours required for engine quality aging.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a non-contact type engine displacement analysis device according to the present invention. FIG. 2 is a front view of a non-contact type engine displacement analysis device according to the present invention. FIG. FIG. 4 is an explanatory view of a non-contact type engine displacement analysis method according to the present invention. FIG. 5 is an explanatory view of a non-contact type engine displacement analysis method according to the present invention. FIG. Illustration of contact-type engine displacement analysis method [Description of symbols]
DESCRIPTION OF SYMBOLS 1 ... Moving part, 2 ... Measurement part, 3 ... Measurement control part, 4 ... Display part, 23, 27 ... Pulse motor, 29 ... Laser displacement sensor, 40 ... Auxiliary belt, 41 ... AC generator pulley, 42 ... Air conditioner compressor Pulley, 44: Water pump pulley, W: Engine.

Claims (5)

In the stationary state of the engine, at least three arbitrary positions of at least three pulleys are measured in a non-contact manner with respect to at least one of various pulleys attached around the engine to stretch the belt, and the plane data of each pulley is obtained from the point data. A non-contact type engine displacement analysis method, wherein data is created and a relative positional relationship between these plane data and preset reference plane data is obtained. The non-contact type engine displacement analysis method according to claim 1, wherein the relative positional relationship between the plane data and the reference plane data is a shift amount and / or an inclination amount of the plane data with respect to the reference plane data. In the engine driving state, one-axis time-series displacement at a certain point of one or more pulleys of various pulleys attached around the engine and extending a belt is measured in a non-contact manner, and the belt squeals based on the time-series displacement data. A non-contact type engine displacement analysis method characterized by investigating the cause of the occurrence of the engine. In the engine driving state, the time series displacement of one axis of the run-out at a point of the belt stretched by various pulleys mounted around the engine is measured in a non-contact manner, and the cause of the belt squeal is determined by the time series displacement data. A non-contact type engine displacement analysis method characterized by investigation. A measuring unit that measures the position of any point of various pulleys attached around the engine and stretches the belt in a non-contact manner, and creates plane data of each pulley from the point data of each pulley measured by this measuring unit. A non-contact type engine displacement analysis device, comprising: a measurement control unit that calculates a relative positional relationship with reference plane data set beforehand; and a display unit that displays a processing result of the measurement control unit.

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