JP3881287B2 - Method and apparatus for measuring wheel alignment of automobile - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wheel alignment measuring method and apparatus for an automobile.
[0002]
[Prior art]
Conventionally, a technique disclosed in Japanese Patent No. 2938984 is known as a technique for measuring the wheel alignment of an automobile. In this publication, the wheel alignment is measured via the wheel attachment portion without attaching the wheel in the assembly line for assembling the automobile body, thereby improving the productivity.
[0003]
In this type of wheel alignment measuring method, in the assembly line of an automobile body, after the steering device and the suspension device are assembled to the vehicle body conveyed by the hanger, the vehicle body is first detached from the hanger and the suspension device is assembled. Thus, the vehicle body is supported so as to be movable up and down through a wheel mounting portion provided on the vehicle body. Next, a connecting tool such as a chain provided in the lowering means for lowering the vehicle body is connected to the front and rear of the vehicle body to lower the vehicle body downward, and a predetermined load is applied to the vehicle body. Thereby, the urging force corresponding to the predetermined load is applied to the suspension device by the reaction force from the wheel mounting portion, and the vehicle body is fixed in a state closest to the traveling state at the time when the wheel is assembled to the axle. And this state is maintained and foil alignment is measured via a wheel attachment part.
[0004]
However, according to such a conventional method, the state closest to the running state must be reproduced with respect to the vehicle body, and the vehicle body detached from the hanger is lowered by the lowering means before measuring the wheel alignment. Therefore, there is a disadvantage that the number of man-hours for measurement is relatively large and the efficiency is poor.
[0005]
Further, when the vehicle body is pulled downward by the lowering means, depending on the connecting position of the chain or the like provided in the lowering means, it is difficult to apply a load equally to the four wheel mounting portions, and the alignment measurement accuracy may be reduced. is there.
[0006]
[Problems to be solved by the invention]
The present invention eliminates such inconveniences, and the present invention can measure the wheel alignment quickly and accurately without applying the same load to the wheel mounting portion, and can improve the productivity. And an apparatus for the same.
[0007]
[Means for Solving the Problems]
In order to achieve such an object, the wheel alignment measuring method for a vehicle according to the present invention for measuring the toe angle of the wheel of the vehicle first supports the vehicle body by allowing the wheel mounting portion to be raised and lowered, and the wheel during traveling of the vehicle. A wheel attachment part raising step is performed for raising the wheel attachment part to a predetermined height position set below the position of the attachment part.
[0008]
At the height position where the wheel mounting portion is raised, for example, when the vehicle body is supported by a hanger in the assembly line of the vehicle body, the height does not rise up following the wheel mounting portion and does not leave the hanger. Position. This makes it possible to measure the toe angle in a stable support state without lifting the vehicle body from the hanger.
[0009]
Next, a measurement process for measuring the position and toe angle of the wheel mounting part that is raised by the wheel mounting part ascending process is performed, and a first calculation process and a second calculation process are performed in the measurement process.
[0010]
That is, in the first calculation step, first, the position at which the wheel attachment portion is started to be raised by the wheel attachment portion raising step and the toe angle of the position are measured, and the coordinates composed of the measured position and the toe angle are obtained. The first reference coordinate is assumed. Next, the position of the wheel mounting portion and the toe angle of each position are measured at predetermined intervals until the wheel mounting portion is raised to the predetermined height position, and the measured position and each position are measured. A plurality of coordinates composed of toe angles are taken as measurement coordinates. Then, the inclination of each straight line connecting the first reference coordinate and each measurement coordinate is calculated.
[0011]
In the second calculation step, first, an inclination of each straight line connecting the second reference coordinate calculated in advance and each set coordinate and an inclination of each straight line connecting the first reference coordinate and each measurement coordinate are calculated. Calculate the difference. The second reference coordinates are determined in advance corresponding to the position of the wheel mounting portion of the first reference coordinate (that is, the position where the rising of the wheel mounting portion in the wheel mounting portion raising process is started) and the position. Coordinates with correct toe angle.
[0012]
Each set coordinate is the position of the wheel mounting portion at each measurement coordinate (that is, the position of the wheel mounting portion measured at a predetermined interval until the wheel mounting portion is raised to the predetermined height position. ) And a correct toe angle determined in advance corresponding to each position.
[0013]
The inventor conducted various tests on the toe angle and the camber angle change amount, the inclination of each straight line connecting the second reference coordinate and each set coordinate, the first reference coordinate and each measurement coordinate, It has been found that the difference between the inclination of each straight line connecting the two changes with respect to the position of the wheel mounting portion.
[0014]
Therefore, in the second calculation step, based on the difference between the slope of each straight line connecting the second reference coordinate and each set coordinate and the slope of each straight line connecting the first reference coordinate and each measurement coordinate. Then, an estimated value of the toe angle of the position of the wheel mounting portion when the automobile is running is calculated. By doing this, the toe angle of the position of the wheel mounting portion during traveling can be obtained by calculation without actually setting the wheel mounting portion as the position during traveling of the automobile, and the same load as that during traveling is applied to the vehicle body. Thus, the toe angle can be measured efficiently in a short time without the need for a process to be performed.
[0015]
In addition, the automotive wheel alignment measurement method of the present invention for measuring the automotive camber angle measures the camber angle in the same manner as the toe angle measurement described above. Therefore, according to the present invention, the position of the wheel mounting portion and the camber angle that are raised to a predetermined height position set below the position of the wheel mounting portion when the vehicle is running are measured by the wheel mounting portion rising step. The camber angle at the position of the wheel mounting portion during traveling can be obtained by calculation, and the camber angle can be measured efficiently in a short time without the need to apply the same load to the vehicle body as during traveling. it can.
[0016]
Further, the device of the present invention for measuring the toe angle is provided at a lower position of the vehicle body supported by the vehicle body support means for supporting the vehicle body with the wheel mounting portion being movable up and down, and traveling of the vehicle. Wheel attachment portion raising means for raising the wheel attachment portion to a predetermined height position set below the position of the wheel attachment portion at the time, and the height position of the wheel attachment portion provided in the wheel attachment portion raising means First measuring means for measuring the wheel, second measuring means for measuring the toe angle of the axle via the wheel mounting portion provided in the wheel mounting portion lifting means, and raising of the wheel mounting portion by the wheel mounting portion lifting means Measurement of the height position by the first measuring means and measurement of the toe angle by the second measuring means at every predetermined interval from the position where the wheel is mounted to the predetermined height position. Measurement system And means, based on the measurements by said said first measuring means second measuring means, and a toe angle calculating means for calculating the toe angle corresponding to the position of the wheel mount during running of the automobile.
[0017]
Further, the apparatus of the present invention for measuring the camber angle includes a vehicle body support means and a wheel mounting part raising means, similarly to the toe angle measurement apparatus. Furthermore, a first measuring means provided in the wheel mounting portion raising means for measuring the height position of the wheel mounting portion, and a camber angle of the axle provided through the wheel mounting portion provided in the wheel mounting portion raising means. The first measuring unit and the first mounting unit at a predetermined interval from the position at which the wheel mounting part is started to rise to the predetermined height position by the wheel mounting part raising unit. Based on the measurement control means for measuring the height position by the measurement means and the measurement of the camber angle by the second measurement means, and on the basis of the measured values by the first measurement means and the second measurement means, Camber angle calculating means for calculating a camber angle corresponding to the position of the wheel mounting portion at the time.
[0018]
When the toe angle is measured by the apparatus of the present invention, the vehicle body support means first supports the vehicle body. At this time, the vehicle body only needs to be supported with the wheel mounting portion being movable up and down. Thus, specifically, for example, a hanger that conveys the vehicle body in the vehicle body assembly line of the automobile can be used as the vehicle body support means.
[0019]
Next, the wheel attachment portion raising means raises the wheel attachment portion of the vehicle body supported by the vehicle body support means. At this time, the wheel attachment portion raising means raises the wheel attachment portion to a predetermined height position set below the position of the wheel attachment portion when the automobile is running.
[0020]
The measurement control means measures the height position of the wheel mounting portion by the first measuring means and the toe angle of the wheel mounting portion by the second measuring means when the wheel mounting portion is raised by the wheel mounting portion raising means. And measure. At this time, the measurement control means measures the position where the rising of the wheel mounting portion by the wheel mounting portion lifting means is started by the first measuring means, and further, the wheel mounting portion is raised to a predetermined height position. The height position of the wheel mounting portion is measured at every predetermined interval until it is done. On the other hand, the said measurement control means measures the toe angle in each height position by the said 2nd measurement means simultaneously with the measurement of each height position of a wheel attaching part.
[0021]
Subsequently, the toe angle calculating means calculates a toe angle corresponding to the position of the wheel mounting portion when the automobile is running, based on the measurement values obtained by the first measuring means and the second measuring means. Thus, by raising the wheel mounting portion to the predetermined height position, the toe angle at the position of the wheel mounting portion when the vehicle is running is calculated, so that the toe angle is not applied to the vehicle body as in the prior art. The angle can be measured, and the toe angle at the time of traveling of the automobile can be obtained quickly and reliably with a simple apparatus configuration.
[0022]
In addition, the apparatus for measuring the camber angle of the present invention is configured in the same manner as the toe angle measuring apparatus described above, so that a predetermined height set below the position of the wheel mounting portion when the automobile is running is set. The position and camber angle of the wheel mounting part that is raised to the position are measured, and the camber angle calculating means calculates the camber angle at the position of the wheel mounting part at the time of traveling. Therefore, the camber angle can be measured without any problem, and the camber angle can be quickly obtained while the vehicle is running with a simple apparatus configuration.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram showing a schematic configuration of an alignment measuring apparatus according to the present embodiment, FIG. 2 is an operation explanatory diagram of a wheel mounting portion raising means, FIG. 3 is an explanatory diagram of second measuring means, and FIG. 4 is a toe angle measuring method. FIG. 5 is a diagram showing the relationship between the position of the wheel mounting portion and the toe angle, FIG. 6 is a flowchart showing a method for measuring the camber angle, and FIG. 7 shows the relationship between the position of the wheel mounting portion and the camber angle. FIG.
[0024]
In FIG. 1, reference numeral 1 denotes a hanger (vehicle body support means) that supports a vehicle body 2 and conveys the vehicle body 2 along an assembly line (not shown). The alignment measuring apparatus 3 according to the present embodiment is provided below the conveyance path of the vehicle body 2 by the hanger 1. The vehicle body 2 conveyed to a position immediately above the alignment measuring device 3 is assembled with a steering device and a suspension device 4 (not shown) on the assembly line, and the steering position of the steering device is adjusted to the neutral position. In addition, the wheel attachment portion 5 provided on the vehicle body 2 via the suspension device 4 is not attached to the wheel, and is hung so as to be able to be raised and lowered by the suspension support of the vehicle body 2 by the hanger 1.
[0025]
As shown in FIG. 1, the alignment measuring device 3 includes a wheel mounting part raising unit 6 that raises the wheel mounting part 5, a first measuring unit 7 that measures the height position of the wheel mounting part 5, and the wheel mounting. And a second measuring means 8 for measuring the toe angle and the camber angle of the unit 5. The first measurement means 7 and the second measurement means 8 are connected to a measurement control means (not shown) that controls measurement at a plurality of positions described later. Further, the measurement control means is connected to calculation means (toe angle calculation means, camber angle calculation means) (not shown), and the calculation means is based on a plurality of measurement values (described later) collected via the measurement control means. The angle and camber angle are calculated.
[0026]
As shown in FIGS. 1 and 2, the wheel mounting portion raising means 6 includes a contact member 9 that contacts the wheel mounting portion 5 from below, and a liftable lifting plate 10 that integrally supports the contact member 9. And a cylinder 11 for raising the wheel mounting portion 5 that is in contact with the contact member 9 via the elevating plate 10.
[0027]
As shown in FIG. 1, the cylinder 11 is supported on a support table 13 that is supported on an upper part of a lifting platform 12 so as to be slidable in the vehicle width direction. The elevator 12 is moved up and down by a so-called pantograph method. For example, the vehicle body 2 conveyed by the hanger 1 descends when passing over the alignment measuring device 3, and the alignment measuring device 3 and the vehicle body 2 being conveyed are moved. Interference can be prevented.
[0028]
The support table 13 is slidably supported on a rail 14 extending in the vehicle width direction at the upper part of the elevator 12 and is slid by a driving means (not shown). When the vehicle body 2 is positioned immediately above the alignment measuring device 3, the driving means performs alignment between the wheel mounting portion 5 of the vehicle body 2 and the contact member 9.
[0029]
As shown in FIGS. 1 and 2, the first measuring means 7 is a laser sensor provided on the support table 13, and the axial position of the wheel mounting portion 5 is measured by measuring the rising distance of the lifting plate 10. Measure. Further, as shown in FIG. 3, the second measuring means 8 is constituted by three laser sensors (first sensor 15, second sensor 16, third sensor 17), and a support member 18 (shown in FIG. 2). The cylinder 11 is supported and lifted by the cylinder 11. The first sensor 15, the second sensor 16, and the third sensor 17 oppose the three points e, f, and g of the wheel mounting portion 5, respectively. The first sensor 15 is the distance to the point e of the wheel mounting part 5, the second sensor 16 is the distance to the point f of the wheel mounting part 5, and the third sensor 17 is the distance to the point g of the wheel mounting part 5. Measure each one. The vertical displacement between point e and the center point between points f and g is measured from the difference in distance measured by first sensor 15, second sensor 16, and third sensor 17, and the camber angle is calculated from this displacement. Is detected. Further, the horizontal displacement between the point f and the point g is measured from the difference in distance measured by the second sensor 16 and the third sensor 17, and the toe angle is detected from this displacement.
[0030]
Next, the foil alignment measuring method according to the present embodiment will be described. As shown in FIG. 1, when the vehicle body 2 supported by the hanger 1 is transported immediately above the alignment measuring device 3, the lifting platform 12 is raised and the wheel mounting portion lifting means 6 is brought close to the wheel mounting portion 5. .
[0031]
Next, as shown in FIG. 2, the lift plate 10 is raised by the cylinder 11, and the contact member 9 contacts the wheel mounting portion 5. At this time, the axial center position of the wheel mounting portion 5 where the ascent starts is measured by the first measuring means 7. Note that the wheel mounting portion 5 at this time is in a position depending on the vehicle body 2, and the measured vehicle type of the present embodiment is somewhat less than −90 mm with respect to the position of the wheel mounting portion 5 during travel (0 mm). In the down position.
[0032]
Further, the lift plate 10 is further raised by the cylinder 11, and the wheel attachment portion 5 is raised until the axial center position of the wheel attachment portion 5 is -60 mm with respect to the position of the wheel attachment portion 5 during traveling. . In the present embodiment, the position of −90 mm is the measurement start position.
[0033]
On the other hand, when the wheel mounting portion 5 is lifted by the wheel mounting portion lifting means 6, a plurality of positions of the wheel mounting portion 5 and toe angles and camber angles corresponding to the respective positions are measured by the control of the measurement control means. Is done. In the present embodiment, the first measurement means indicates that the wheel attachment portion 5 is positioned at −90 mm, −80 mm, −70 mm, and −60 mm with respect to the position of the wheel attachment portion 5 during traveling by the control of the measurement control means. The toe angle and the camber angle at each position are measured by the second measuring means 8.
[0034]
In this embodiment, the vehicle body 2 supported by the hanger 1 is lifted by 30 mm from the position of −90 mm even if the wheel mounting part 5 is lifted to a position of −60 mm with respect to the position of the wheel mounting part 5 during traveling. However, it does not float away from the hanger 1. Thus, the maximum ascending position of the wheel mounting portion 5 is set to a position where the vehicle body 2 is not lifted and the state supported by the hanger 1 is reliably maintained.
[0035]
And after the wheel mounting part 5 is raised by the wheel mounting part raising means 6, the position of the wheel mounting part 5 and the toe angle and the camber angle are measured, and then the calculation means makes the wheel mounting part 5 A toe angle and a camber angle corresponding to the position are calculated.
[0036]
Here, calculation of the toe angle corresponding to the position of the wheel mounting portion 5 during traveling by the calculation means will be described. First, in STEP 1 shown in FIG. 4, the wheel mounting portion 5 by the wheel mounting portion lifting means 6 is lifted, and the axial center position (a = −90 mm) and the toe angle b of the wheel mounting portion 5 at the measurement start position are measured. Subsequently, the toe angle b is measured at predetermined intervals (every 10 mm) until the axial center position of the wheel mounting portion 5 reaches a predetermined position (a = -60 mm). From the position and toe angle measured at this time, as shown in FIG. 5, first, the coordinates (a, b) of the toe angle measured when the axial center position of the wheel mounting portion 5 is −90 mm are set to the first. The reference coordinate J is assumed. Further, the coordinates (a, b) of the toe angle measured when the axial center position of the wheel mounting portion 5 is −80 mm are the coordinates of the toe angle (a, b) measured when the first measuring coordinate J _{1 is} −70 mm ( a, b) is the second measurement coordinate J ₂ , and the toe angle coordinate (a, b) measured at −60 mm is the third measurement coordinate J ₃ .
[0037]
Next, as shown in FIG. 5, the slope Δtoe _{j st = -80} of the straight line connecting the first reference coordinate J and the first measurement coordinate J ₁ , the first reference coordinate J and the second measurement coordinate J _2. The slope Δtoe _{j st = −70} of the straight line connecting the two and the slope Δtoe _{j st = −60} of the straight line connecting the first reference coordinate J and the third measurement coordinate J ₃ are calculated (STEP 2 in FIG. 4). Hereinafter, the slope calculated at this time is referred to as an actually measured slope (Δtoe _j ).
[0038]
On the other hand, in the calculating means, the correct amount of change in the toe angle associated with the rise of the wheel mounting portion 5 by the wheel mounting portion raising means 6 for each vehicle type is recorded as a basic characteristic curve T shown in FIG. Further, in the basic characteristic curve T, as shown in FIG. 5, the coordinates of the correct toe angle when the axial center position of the wheel mounting portion 5 is −90 mm are set as the second reference coordinates N. Similarly, the wheel mounting The correct toe angle coordinate when the axial center position of the portion 5 is −80 mm is the first set coordinate N ₁ , and the correct toe angle coordinate when the axis position is −70 mm is the second set coordinate N ₂ , −60 mm. The correct toe angle coordinate is set as the third set coordinate N ₃ . Then, as shown in FIG. 5, the slope Δtoe _{n st = -80} of the straight line connecting the second reference coordinate N and the first set coordinate N ₁ , the second reference coordinate N and the second set coordinate N _2. the slope of the line Δtoe _{n st = -70} connecting the bets, the second reference coordinates n and the third set coordinates n ₃ and the slope of the line Δtoe _{n st = -60} connecting is calculated in advance, respectively (STEP3 see FIG. 4 ) And the result is stored. Hereinafter, the inclination stored in advance is referred to as a basic inclination (Δtoe _n ).
[0039]
Subsequently, in STEP 4 of FIG. 4, the difference (m) between each measured inclination (Δtoe _j ) and each basic inclination (Δtoe _n ) is calculated.
[0040]
[Expression 1]
m _-80 = Δtoe _{n st = -80} -Δtoe _{j st = -80} (1)
[0041]
[Expression 2]
m ₋₇₀ = Δtoe _{n st = −70} −Δto e _{j st = −70} (2)
[0042]
[Equation 3]
m _-60 = Δtoe _{n st = -60} −Δtoe _{j st = -60} (3)
[0043]
As a result, the differences m _-80 , m _-70 , and m _-60 of the respective inclinations are obtained. The present inventor conducted various tests that the difference (m) between each measured inclination (Δtoe _j ) and each basic inclination (Δtoe _n ) at each position of the axis of the wheel mounting portion 5 shows a constant change amount. I know. Therefore, the inclination difference m ₀ at the axial center position ( ₀ mm) of the wheel mounting portion 5 during traveling is estimated from the calculated differences m ₋₈₀ , m ₋₇₀ and m ₋₆₀ (STEP 5 in FIG. 4).
[0044]
Then, based on the value of m ₀ , the toe angle y at the axial center position (0 mm) of the wheel mounting portion 5 during traveling is calculated by Equation (4) representing the inclination Δtoe _{j st = 0} (FIG. 4). STEP 6).
[0045]
[Expression 4]
y = α (x−a) + b (4)
[0046]
In the equation (4), α is an inclination Δtoe _{j st = 0} at the axial center position x of the wheel mounting portion 5 during traveling (α = Δtoe _{n st = 0} + m ₀ ). In addition, the toe angle y of the axial center position (x = 0) of the wheel mounting portion 5 at the time of traveling in Formula (4) can be expressed by Formula (5).
[0047]
[Equation 5]
y = −αa + b (5)
[0048]
Next, calculation of the camber angle corresponding to the position of the wheel mounting portion 5 during traveling by the calculation means will be described. In the present embodiment, the measurement of the camber angle and the measurement of the toe angle are performed simultaneously. And the camber angle corresponding to the position of the wheel mounting part 5 at the time of driving | running | working is calculated | required by the said calculating means similarly to the case of the toe angle mentioned above.
[0049]
That is, in STEP 1 shown in FIG. 6, the axial center position (a = −90 mm) of the wheel mounting portion 5 and the camber angle b at the time when the lifting of the wheel mounting portion 5 by the wheel mounting portion lifting means 6 is started are measured. Subsequently, the camber angle b is measured at predetermined intervals (every 10 mm) until the axial center position of the wheel mounting portion 5 reaches a predetermined position (a = -60 mm). From the position and camber angle measured at this time, as shown in FIG. 7, first, the coordinates (a, b) of the camber angle measured when the axial center position of the wheel mounting portion 5 is −90 mm are set to the first. The reference coordinate J is assumed. Further, the coordinates (a, b) of the camber angle measured when the axial center position of the wheel mounting portion 5 is −80 mm are the coordinates of the camber angle (a, b) measured at the first measurement coordinate J ₁ , −70 mm ( Let a, b) be the second measurement coordinate J ₂ , and the camber angle measured at −60 mm be the third measurement coordinate J ₃ .
[0050]
Next, as shown in FIG. 7, the slope Δcam _{j st = -80} of the straight line connecting the first reference coordinate J and the first measurement coordinate J ₁ , the first reference coordinate J and the second measurement coordinate J _2. The slope Δcam _{j st = −70} of the straight line connecting the two and the slope Δcam _{j st = −60} of the straight line connecting the first reference coordinate J and the third measurement coordinate J ₃ is calculated (STEP 2 in FIG. 6). Hereinafter, the inclination calculated at this time is referred to as an actually measured inclination (Δcam _j ).
[0051]
On the other hand, in the calculating means, the correct amount of change in the camber angle accompanying the raising of the wheel mounting portion 5 by the wheel mounting portion raising means 6 for each vehicle type is recorded as a basic characteristic curve C shown in FIG. Further, in the basic characteristic curve C, as shown in FIG. 7, the coordinates of the correct camber angle when the axial center position of the wheel mounting portion 5 is −90 mm is set as the second reference coordinate N. Similarly, the wheel mounting When the axial center position of the portion 5 is −80 mm, the correct camber angle coordinate is the first set coordinate N ₁ , and when the correct camber angle coordinate is −70 mm, the correct camber angle coordinate is the second set coordinate N ₂ , −60 mm. The correct camber angle coordinate is the third set coordinate N ₃ . As shown in FIG. 7, the slope Δcam _{n st = −80} of the straight line connecting the second reference coordinate N and the first set coordinate N ₁ , the second reference coordinate N and the second set coordinate N _2. The straight line slope Δcam _{n st = −70} and the straight line slope Δcam _{n st = −60} connecting the second reference coordinate N and the third set coordinate N ₃ are respectively calculated in advance (STEP 3 in FIG. 6). The result is stored. Hereinafter, the inclination stored in advance is referred to as a basic inclination (Δcam _n ).
[0052]
Subsequently, in STEP 4 of FIG. 6, a difference (m) between each measured inclination (Δcam _j ) and each basic inclination (Δcam _n ) is calculated. The calculation of the difference (m) is the same as in the case of the toe angle measurement described above.
[0053]
[Formula 6]
m _-80 = Δcam _{n st = -80} −Δcam _{j st = -80} (6)
[0054]
[Expression 7]
m ₋₇₀ = Δcam _{n st = −70} −Δcam _{j st = −70} (7)
[0055]
[Equation 8]
m _-60 = Δcam _{n st = -60} −Δcam _{j st = -60} (8)
[0056]
As a result, the differences m _-80 , m _-70 , and m _-60 of the respective inclinations are obtained. In the case of the camber angle, as in the toe angle, the difference (m) between each measured inclination (Δcam _j ) and each basic inclination (Δcam _n ) at each position of the axis of the wheel mounting portion 5 is constant. It has been confirmed by various tests by the present inventors that the amount of change is shown. Therefore, an estimated value m ₀ of the inclination difference at the axial center position (0 mm) of the wheel mounting portion 5 during traveling is obtained from the calculated differences m _-80 , m _-70 , and m _-60 (see FIG. 6). (STEP 5).
[0057]
From this, the camber angle y at the axial center position (0 mm) of the wheel mounting portion 5 during traveling is calculated using STEP (5) in FIG.
[0058]
As described above, according to the present embodiment, the toe angle and the camber angle at the axial center position of the wheel mounting portion 5 during traveling can be calculated very quickly without applying the same load to the vehicle body during traveling. Moreover, the toe angle and the camber angle can be obtained only by raising the wheel mounting portion 5 to a predetermined position (in this embodiment, a position of −60 mm from the travel time) without removing the vehicle body 2 from the hanger 1. The alignment can be measured efficiently and the productivity can be improved.
[0059]
Note that the measurement start position and the interval between the measurement positions described above are appropriately determined according to the characteristics of the suspension of the vehicle model to be measured, and have the dimensions employed in the measurement of the toe angle and the camber angle in this embodiment. It is not limited. In addition, the measurement accuracy can be increased as the interval between the measurement positions is set shorter.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a schematic configuration of an alignment measurement apparatus according to an embodiment of the present invention.
FIG. 2 is a diagram for explaining the operation of the wheel mounting portion raising means.
FIG. 3 is an explanatory diagram of second measuring means.
FIG. 4 is a flowchart illustrating a toe angle measuring method.
FIG. 5 is a diagram showing a relationship between a position of a wheel mounting portion and a toe angle.
FIG. 6 is a flowchart illustrating a method for measuring a camber angle.
FIG. 7 is a diagram showing a relationship between a position of a wheel mounting portion and a camber angle.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Hanger (vehicle body support means), 2 ... Vehicle body, 3 ... Wheel alignment measuring apparatus, 5 ... Wheel attachment part, 6 ... Wheel attachment part raising means, 7 ... 1st measurement means, 8 ... 2nd measurement means.

Claims (4)

In the method of measuring the wheel alignment of a car that measures the toe angle of the car wheel,
A wheel mounting portion raising step for supporting the vehicle body so that the wheel mounting portion can be raised and lowered, and raising the wheel mounting portion to a predetermined height position set below the position of the wheel mounting portion when the vehicle is running;
A measuring step for measuring the position and toe angle of the wheel mounting portion raised by the wheel mounting portion raising step,
The measuring step uses, as a first reference coordinate, a coordinate composed of the position of the wheel mounting portion measured at the start of ascent of the wheel mounting portion in the wheel mounting portion raising step and the toe angle measured at the position. A plurality of coordinates consisting of the position of the wheel mounting portion measured at predetermined intervals until the mounting portion is raised to the predetermined height position and the toe angle measured at each position are used as measurement coordinates. A first calculation step of calculating an inclination of each straight line connecting one reference coordinate and each measurement coordinate;
The coordinates consisting of the position of the wheel mounting portion in the first reference coordinates and the correct toe angle predetermined in correspondence with the position are set as the second reference coordinates, and each position of the wheel mounting portion in the respective measurement coordinates The slope of each straight line connecting the second reference coordinate calculated in advance and each set coordinate is set to a plurality of coordinates including a correct toe angle predetermined corresponding to each position, and the first reference And a second calculation step of calculating an estimated value of the toe angle of the position of the wheel mounting portion when the automobile is running based on the difference between the inclination of each straight line connecting the coordinates and each measurement coordinate. Method for measuring wheel alignment of automobiles. In the method of measuring the wheel alignment of a vehicle for measuring the camber angle of a vehicle wheel,
A wheel mounting portion raising step for supporting the vehicle body so that the wheel mounting portion can be raised and lowered, and raising the wheel mounting portion to a predetermined height position set below the position of the wheel mounting portion when the vehicle is running;
A measuring step of measuring the position and camber angle of the wheel mounting portion raised by the wheel mounting portion raising step,
The measuring step uses, as a first reference coordinate, a coordinate composed of the position of the wheel mounting portion measured at the start of the lifting of the wheel mounting portion in the wheel mounting portion rising step and the camber angle measured at the position, A plurality of coordinates consisting of the position of the wheel mounting portion measured at predetermined intervals until the mounting portion is raised to the predetermined height position and the camber angle measured at each position are used as measurement coordinates. A first calculation step of calculating an inclination of each straight line connecting one reference coordinate and each measurement coordinate;
The coordinates consisting of the position of the wheel mounting portion in the first reference coordinates and the correct camber angle predetermined corresponding to the position are set as the second reference coordinates, and each position of the wheel mounting portion in each measurement coordinate The slope of each straight line connecting the second reference coordinates calculated in advance and the set coordinates, and the first reference, with a plurality of coordinates consisting of a predetermined correct camber angle corresponding to each position as the set coordinates. And a second calculation step of calculating an estimated value of the camber angle of the position of the wheel mounting portion when the automobile is running based on the difference between the coordinates and the slope of each straight line connecting each measurement coordinate. Method for measuring wheel alignment of automobiles. In an automobile wheel alignment measuring device that measures the toe angle of an automobile foil,
Vehicle body support means for supporting the vehicle body by allowing the wheel mounting portion to move up and down;
A wheel mounting part lift that is provided at a lower position of the vehicle body supported by the vehicle body support means and raises the wheel mounting part to a predetermined height position set lower than the position of the wheel mounting part during traveling of the automobile. Means,
First measuring means provided in the wheel mounting portion raising means for measuring the height position of the wheel mounting portion;
Second measuring means provided on the wheel mounting portion raising means for measuring the toe angle of the axle through the wheel mounting portion;
The height position by the first measuring means is changed at a predetermined interval from the position at which the wheel attachment portion is raised by the wheel attachment portion raising means until the wheel attachment portion is raised to a predetermined height position. Measurement control means for performing measurement and toe angle measurement by the second measurement means;
And a toe angle calculating means for calculating a toe angle corresponding to the position of the wheel mounting portion when the vehicle is running based on the measured values obtained by the first measuring means and the second measuring means. Automotive wheel alignment measuring device. In an automobile foil alignment measuring device for measuring the camber angle of an automobile foil,
Vehicle body support means for supporting the vehicle body by allowing the wheel mounting portion to move up and down;
A wheel mounting part lift that is provided at a lower position of the vehicle body supported by the vehicle body support means and raises the wheel mounting part to a predetermined height position set lower than the position of the wheel mounting part during traveling of the automobile. Means,
First measuring means provided in the wheel mounting portion raising means for measuring the height position of the wheel mounting portion;
Second measuring means provided in the wheel mounting portion raising means for measuring the camber angle of the axle through the wheel mounting portion;
The height position by the first measuring means is changed at a predetermined interval from the position at which the wheel attachment portion is raised by the wheel attachment portion raising means until the wheel attachment portion is raised to a predetermined height position. Measurement control means for measuring and measuring the camber angle by the second measurement means;
And a camber angle calculating means for calculating a camber angle corresponding to the position of the wheel mounting portion when the vehicle is running based on the measured values by the first measuring means and the second measuring means. Automotive wheel alignment measuring device.

Images