JP2004012195A - Method and device for measuring wheel alignment of automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and device for measuring wheel alignment of an automobile by which the productivity of the automobile can be improved by quickly measuring the wheel alignment of the automobile with high accuracy without applying the same load as that applied to the car body of the automobile when the automobile is run to the car body. <P>SOLUTION: The vertically movable wheel attaching section 5 of the car body 2 is raised to a prescribed height position set lower than the position of the section 5 when the automobile is run by supporting the car body 2. The position of the ascending wheel attaching section 5 and the toe-angle and camber angle of the wheel attached to the section 5 are measured and the estimated values of the toe-angle and camber angle at the position of the wheel attaching section 5 when the automobile is run are calculated based on the measured values. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method and an apparatus for measuring a wheel alignment of an automobile.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a technique for measuring a wheel alignment of an automobile, one disclosed in Japanese Patent No. 2938984 is known. In the publication, wheel alignment is measured via a wheel mounting portion without mounting wheels on an assembly line for assembling an automobile body, thereby improving productivity.
[0003]
In this type of wheel alignment measuring method, in an assembly line of an automobile body, after a steering device and a suspension device are assembled to a vehicle body conveyed by a hanger, first, the vehicle body is detached from the hanger, and the suspension device is assembled. Thus, the vehicle body is supported to be able to move up and down via a wheel mounting portion provided on the vehicle body. Next, a connecting member such as a chain provided in a pulling-down means for lowering the vehicle body is connected to the front and rear of the vehicle body to lower the vehicle body downward to apply a predetermined load to the vehicle body. As a result, the suspension device is provided with an urging force corresponding to a predetermined load by a reaction force from the wheel mounting portion, and the vehicle body is fixed in a state closest to a running state at the time of completion when the wheels are assembled to the axle. Then, while maintaining this state, the wheel alignment is measured via the wheel mounting portion.
[0004]
However, according to such a conventional method, it is necessary to reproduce the state closest to the running state with respect to the vehicle body, and before the wheel alignment is measured, the vehicle body detached from the hanger is lowered by the lowering means. In this case, there is a disadvantage that the number of steps required for the measurement is relatively large and the efficiency is low.
[0005]
Further, when the vehicle body is pulled down by the pulling-down means, it is difficult to evenly apply a load to the four wheel mounting portions depending on the connection position of the chain or the like provided in the pulling-down means, and the measurement accuracy of the alignment may be reduced. is there.
[0006]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION The present invention solves such a disadvantage by providing a wheel alignment measuring method that can quickly and accurately measure a wheel alignment without applying the same load to a wheel mounting portion and can improve productivity. And an apparatus therefor.
[0007]
[Means for Solving the Problems]
In order to achieve this object, a method for measuring the toe angle of a wheel of a vehicle according to the present invention comprises the steps of: first supporting a vehicle body such that a wheel mounting portion is vertically movable; A wheel mounting part raising step of raising the wheel mounting part to a predetermined height set below the position of the mounting part is performed.
[0008]
In the height position where the wheel mounting portion is raised, for example, when the vehicle body is supported by a hanger in an assembly line of the vehicle body, the height is such that the vehicle body follows the wheel mounting portion and does not separate from the hanger. Position. As a result, the toe angle can be measured in a stable supporting state without lifting the vehicle body from the hanger.
[0009]
Next, a measuring step of measuring the position and toe angle of the wheel mounting portion raised in the wheel mounting portion raising step is performed, and in the measuring step, a first calculation step and a second calculation step are performed.
[0010]
That is, in the first calculation step, first, a position at which the ascending of the wheel mounting portion in the wheel mounting portion elevating step is started and a toe angle of the position are measured, and coordinates consisting of the measured position and the toe angle are calculated. Let it be the first reference coordinate. 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 the toe angle at each position are measured. A plurality of coordinates consisting of toe angles are defined as measurement coordinates. Then, the inclination of each straight line connecting the first reference coordinates and each measurement coordinate is calculated.
[0011]
In the second calculation step, first, the inclination of each straight line connecting the second reference coordinate calculated in advance and each set coordinate, and the inclination of each straight line connecting the first reference coordinate and each measured coordinate are calculated. Calculate the difference. The second reference coordinates are predetermined corresponding to the position of the wheel mounting portion of the first reference coordinates (that is, the position where the lifting of the wheel mounting portion by the wheel mounting portion raising step is started) and the position. This is a coordinate consisting of the correct toe angle.
[0012]
Each set coordinate is the position of the wheel mounting portion at each of the measurement coordinates (that is, the position of the wheel mounting portion measured at predetermined intervals until the wheel mounting portion is raised to the predetermined height position). ) And a correct toe angle predetermined for each position.
[0013]
In addition, the inventor performs various tests on the amount of change in the toe angle and the camber angle, and determines the inclination of each straight line connecting the second reference coordinates and each set coordinate, the first reference coordinates, and each measurement coordinate. It has been found that the difference from the inclination of each straight line connecting the constant changes with the position of the wheel mounting portion.
[0014]
Therefore, in the second calculation step, based on a difference between a slope of each straight line connecting the second reference coordinate and each set coordinate and a slope of each straight line connecting the first reference coordinate and each measured coordinate. Then, the estimated value of the toe angle of the position of the wheel mounting portion when the vehicle is running is calculated. By doing so, 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 to the position at the time of traveling of the vehicle, and the same load as when traveling is applied to the vehicle body The toe angle can be measured efficiently in a short period of time by eliminating the need for the step of performing.
[0015]
Further, the method for measuring the wheel alignment of the vehicle of the present invention for measuring the camber angle of the vehicle wheel measures the camber angle in the same manner as the above-described measurement of the toe angle. Therefore, according to the present invention, the camber angle and the position of the wheel mounting portion that is raised to a predetermined height position set below the position of the wheel mounting portion when the vehicle is running by the wheel mounting portion raising step are measured. Just by doing, the camber angle of the position of the wheel mounting part at the time of traveling can be obtained by calculation, and the step of applying the same load to the vehicle body as at the time of traveling is unnecessary, and the camber angle can be measured efficiently in a short time. it can.
[0016]
Further, the apparatus of the present invention for measuring the toe angle is provided at a position below the vehicle body supported by the vehicle body supporting means for supporting the vehicle body by allowing the wheel mounting portion to move up and down, and Wheel mounting portion raising means for raising the wheel mounting portion to a predetermined height position set below the position of the wheel mounting portion at the time, and the height position of the wheel mounting portion provided in the wheel mounting portion raising means Measuring means for measuring the toe angle of the axle via the wheel mounting part provided on the wheel mounting part raising means, and raising the wheel mounting part by the wheel mounting part raising means. The height position is measured by the first measuring means and the toe angle is measured by the second measuring means at predetermined intervals from when the wheel mounting portion is raised to the predetermined height position from the position at which the vehicle starts. 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 device of the present invention for measuring a camber angle includes a vehicle body supporting means and a wheel mounting portion raising means, similarly to the toe angle measuring device. Further, a first measuring means provided on the wheel mounting part raising means for measuring a height position of the wheel mounting part, and a camber angle of the axle measured via the wheel mounting part provided on the wheel mounting part raising means. The first measuring means and the first mounting means at predetermined intervals between a position at which the wheel mounting portion is raised by the wheel mounting portion raising device and a position at which the wheel mounting portion is raised to a predetermined height position. Measurement control means for measuring the height position by the measurement means and measurement of the camber angle by the second measurement means; and running of the vehicle based on the respective measurement values by the first and second measurement means. Camber angle calculation 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 device of the present invention, first, the vehicle body supporting means supports the vehicle body. At this time, the vehicle body only needs to be supported so that the wheel mounting portion can be raised and lowered. Thus, specifically, for example, a hanger that conveys the vehicle body on the vehicle body assembly line can be used as the vehicle body support means.
[0019]
Next, the wheel mounting part raising means raises the wheel mounting part of the vehicle body supported by the vehicle body supporting means. At this time, the wheel mounting part raising means raises the wheel mounting part to a predetermined height position set below the position of the wheel mounting part when the automobile is running.
[0020]
The measurement control means measures the height position of the wheel mounting part by the first measuring means and the toe angle of the wheel mounting part by the second measuring means when the wheel mounting part is raised by the wheel mounting part raising means. Measurement. At this time, the measurement control means measures, by the first measuring means, a position at which the lifting of the wheel mounting portion by the wheel mounting portion lifting means is started, and further raises the wheel mounting portion to a predetermined height position. The height position of the wheel mounting portion is measured at predetermined intervals until the operation is performed. On the other hand, the measurement control means measures the toe angle at each height position by the second measurement means simultaneously with the measurement of each height position of the wheel mounting portion.
[0021]
Subsequently, the toe angle calculating means calculates 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. As a result, the toe angle at the position of the wheel mounting portion when the vehicle is running is calculated by raising the wheel mounting portion to the predetermined height position, so that the toe angle is not applied to the vehicle body as in the related art. The angle can be measured, and the toe angle when the automobile is running can be obtained quickly without fail by simplifying the device configuration.
[0022]
Further, the camber angle measuring device of the present invention is also configured in the same manner as the above-described toe angle measuring device, so that the predetermined height set below the position of the wheel mounting portion when the automobile is running. The camber angle and the position of the wheel mounting portion raised to the position are measured, and the camber angle calculating means calculates the camber angle of the position of the wheel mounting portion during traveling. The camber angle can be measured without the need, and the device configuration can be simplified, and the camber angle at the time of traveling of the automobile can be quickly obtained.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view showing a schematic configuration of an alignment measuring apparatus according to the present embodiment, FIG. 2 is an explanatory view of an operation of a wheel mounting unit raising means, FIG. 3 is an explanatory view of a second measuring means, and 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 the method of measuring the camber angle, and FIG. 7 is a diagram showing 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 support means) for supporting a vehicle body 2, which conveys the vehicle body 2 along an assembly line (not shown). The alignment measuring device 3 of the present embodiment is provided below a transport path of the vehicle body 2 by the hanger 1. The vehicle body 2 conveyed to a position directly above the alignment measuring device 3 has a steering device and a suspension device 4 (not shown) assembled on an assembly line, and the steering position of the steering device is adjusted to a neutral position. The wheel mounting portion 5 provided on the vehicle body 2 via the suspension device 4 has no wheels mounted yet, and is hung up and down by the hanging support of the vehicle body 2 by the hanger 1.
[0025]
The alignment measuring device 3 includes, as shown in FIG. 1, a wheel mounting unit raising unit 6 for raising the wheel mounting unit 5, a first measuring unit 7 for measuring a height position of the wheel mounting unit 5, A second measuring means 8 for measuring the toe angle and the camber angle of the section 5. The first measuring means 7 and the second measuring means 8 are connected to measurement control means (not shown) for controlling measurement at a plurality of positions, which will be described later. Further, the measurement control means is connected to calculation means (not shown) (toe angle calculation means, camber angle calculation means), and the calculation means obtains a toe from a plurality of measurement values, which will be described later, collected via the measurement control means. Calculate the angle and camber angle.
[0026]
As shown in FIGS. 1 and 2, the wheel mounting portion lifting means 6 includes a contact member 9 that contacts the wheel mounting portion 5 from below, and a vertically movable lifting plate 10 that integrally supports the contact member 9. And a cylinder 11 for raising the wheel mounting portion 5 which is in contact with the contact member 9 via the lifting plate 10.
[0027]
As shown in FIG. 1, the cylinder 11 is supported on a support table 13 which is slidably supported in the vehicle width direction on an upper part of a lift 12. The elevating table 12 is moved up and down by a so-called pantograph method. For example, when the vehicle body 2 transported by the hanger 1 passes over the alignment measuring device 3, the vehicle body 2 moves down and moves between the alignment measuring device 3 and the transporting vehicle body 2. Interference can be prevented.
[0028]
The support table 13 is slidably supported by rails 14 extending in the vehicle width direction above the elevator 12 and slid by driving means (not shown). When the vehicle body 2 is located directly above the alignment measuring device 3, the drive means aligns the wheel mounting portion 5 of the vehicle body 2 with the contact member 9.
[0029]
The first measuring means 7 is a laser sensor provided on the support table 13 as shown in FIGS. 1 and 2, and measures an ascending distance of the elevating plate 10 to thereby determine an axial center position of the wheel mounting portion 5. Is measured. The second measuring means 8 is composed of three laser sensors (a first sensor 15, a second sensor 16, and a third sensor 17) as shown in FIG. 3, and is provided on a support member 18 (shown in FIG. 2). It is supported integrally and is raised and lowered by the cylinder 11. The first sensor 15, the second sensor 16, and the third sensor 17 face three points e, f, and g of the wheel mounting portion 5, respectively. The first sensor 15 is a distance to the point e of the wheel mounting portion 5, the second sensor 16 is a distance to the point f of the wheel mounting portion 5, and the third sensor 17 is a distance to the point g of the wheel mounting portion 5. Measure each. From the difference in distance measured by the first sensor 15, the second sensor 16, and the third sensor 17, the vertical displacement between the point e and the center point between the points f to g is measured, and the camber angle is calculated from the displacement. Is detected. The horizontal displacement between the point f and the point g is measured from the difference in the distance measured by the second sensor 16 and the third sensor 17, and the toe angle is detected from the displacement.
[0030]
Next, the wheel 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 conveyed directly above the alignment measuring device 3, the lift 12 rises, and the wheel mounting unit lifting means 6 approaches the wheel mounting unit 5. .
[0031]
Next, as shown in FIG. 2, the lift plate 10 is lifted by the cylinder 11, and the contact member 9 contacts the wheel mounting portion 5. At this time, the axis position of the wheel mounting portion 5 at which the ascending is started is measured by the first measuring means 7. Note that the wheel mounting portion 5 at this time is at a position hanging down from the vehicle body 2, and for the vehicle type to be measured in the present embodiment, the position (0 mm) of the wheel mounting portion 5 during traveling is somewhat smaller than −90 mm. It is in the lower position.
[0032]
Then, the lifting plate 10 is further raised by the cylinder 11, and the wheel mounting portion 5 is raised until the axial position of the wheel mounting portion 5 becomes a position of -60 mm with respect to the position of the wheel mounting portion 5 during traveling. . In the present embodiment, the position at -90 mm is the measurement start position.
[0033]
On the other hand, when the wheel mounting part 5 is raised by the wheel mounting part raising means 6, the plurality of positions of the wheel mounting part 5 and the toe angle and the camber angle corresponding to each position are measured by the control of the measurement control means. Is done. In the present embodiment, the first measuring unit determines that the wheel mounting unit 5 is located at −90 mm, −80 mm, −70 mm, and −60 mm with respect to the position of the wheel mounting unit 5 during traveling under the control of the measurement control unit. The toe angle and the camber angle at each position are measured by the second measuring means 8.
[0034]
In this embodiment, even if the vehicle body 2 supported by the hanger 1 is raised to a position of −60 mm with respect to the position of the wheel mounting portion 5 during traveling (up by 30 mm from the position of −90 mm) Even if it does), it does not float away from the hanger 1. As described above, the maximum rising position of the wheel mounting portion 5 is set to a position where the vehicle body 2 does not rise and the state supported by the hanger 1 is reliably maintained.
[0035]
Then, after the position of the wheel mounting portion 5 and the toe angle and the camber angle are measured while the wheel mounting portion 5 is being lifted by the wheel mounting portion raising means 6, the calculating means calculates the position of the wheel mounting portion 5 during traveling. A toe angle and a camber angle corresponding to the position are calculated.
[0036]
Here, the calculation of the toe angle corresponding to the position of the wheel mounting portion 5 during traveling by the calculating means will be described. First, in STEP 1 shown in FIG. 4, the wheel mounting portion 5 is raised by the wheel mounting portion raising means 6, and the axial position (a = -90 mm) of the wheel mounting portion 5 at the measurement start position and the toe angle b are measured. Then, 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 position. The reference coordinates are J. Furthermore, 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 first measured coordinates J ₁ , and the coordinates of the toe angle measured when the axis position is −70 mm ( Let a, b) be the second measurement coordinate J ₂ , and the toe angle coordinate (a, b) measured at −60 mm be the third measurement coordinate J ₃ .
[0037]
Then, as shown in FIG. 5, the slope Δtoe _{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 of the line Δtoe _{j st = -70} connecting bets, the slope of the line Δtoe _{j st = -60} respectively calculates connecting the first reference coordinates J and the third measurement coordinates _{J 3} (STEP2 in FIG. 4). Hereinafter, the inclination calculated at this time is referred to as an actually measured inclination (Δtoe _j ).
[0038]
On the other hand, in the calculation means, the correct amount of change of the toe angle in accordance with the elevation of the wheel mounting part 5 by the wheel mounting part raising means 6 for each type of automobile 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. When the coordinates of the correct toe angle when the axial center position of the part 5 is -80 mm are the first set coordinates N ₁ , and when the correct toe angle coordinates are -70 mm are the second set coordinates N ₂ , -60 mm coordinates of the correct toe angle of is set to the third set coordinates N _3. Then, as shown in FIG. 5, the second reference coordinates N and the first set coordinates _{N 1} and the slope of the line Δtoe _{n st = -80} connecting the second reference coordinates N and a second set coordinates _{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 referred inclination stored in advance as a basic slope (Δtoe _n).
[0039]
Then, in STEP4 shown in FIG. 4, it calculates a difference (m) between the measured slope (Δtoe _j) and each basic slope (Δtoe _n).
[0040]
(Equation 1)
m− ₈₀ = Δtoenst _{= −80−} Δtoejst _{= −80} (1)
[0041]
(Equation 2)
m− ₇₀ = Δtoenst _{= −70−} Δtoejst _{= −70} (2)
[0042]
[Equation 3]
m− ₆₀ = Δtoenst _{= −60−} Δtoejst _{= −60} (3)
[0043]
Thereby, differences m- ₈₀ , m- ₇₀ , and m- ₆₀ of the respective slopes are obtained. The present inventors have tested various difference (m) to exhibit a certain amount of change in the measured inclination and (Δtoe _j) and each basic slope (Δtoe _n) at each position of the axis of the wheel mounting portion 5 I know it. Therefore, the inclination difference m0 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 of the inclinations (STEP5 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 Expression (4) representing the inclination Δtoe jst _{= 0} (FIG. 4). STEP6).
[0045]
(Equation 4)
y = α (x−a) + b (4)
[0046]
Formula alpha (4) the slope Δtoe _{j st = 0} at a central axial position x of the wheel mount 5 during running _{(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 Expression (4) can be expressed by Expression (5).
[0047]
(Equation 5)
y = −αa + b (5)
[0048]
Next, the calculation of the camber angle corresponding to the position of the wheel mounting portion 5 during traveling by the arithmetic means will be described. In the present embodiment, the measurement of the camber angle and the measurement of the toe angle are performed simultaneously. Then, the camber angle corresponding to the position of the wheel mounting portion 5 during traveling is obtained by the calculation means in the same manner as in the case of the toe angle described above.
[0049]
That is, in STEP 1 shown in FIG. 6, the axial position (a = −90 mm) of the wheel mounting portion 5 and the camber angle b at the time when the raising of the wheel mounting portion 5 by the wheel mounting portion raising means 6 is started are measured. Then, 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, first, as shown in FIG. 7, the coordinates (a, b) of the camber angle measured when the axial center position of the wheel mounting portion 5 is -90 mm is the first. The reference coordinates are J. 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 first measured coordinates J ₁ , the coordinates of the camber angle measured when the axis position is −70 mm ( a, b) is the second measurement coordinate J ₂ , and the camber angle measured at −60 mm is the third measurement coordinate J ₃ .
[0050]
Next, as shown in FIG. 7, the inclination Δcam jst _{= −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 of the line Δcam _{j st = -70} connecting bets, the slope of the line Δcam _{j st = -60} respectively calculates connecting the first reference coordinates J and the third measurement coordinates _{J 3} (STEP2 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 calculation means, the correct amount of change in the camber angle due to the elevation of the wheel mounting part 5 by the wheel mounting part raising means 6 for each type of automobile 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 are set as the second reference coordinates N. When the correct camber angle coordinate when the axial center position of the part 5 is −80 mm is the first set coordinate N ₁ , and when the correct camber angle coordinate is −70 mm is the second set coordinate N ₂ , −60 mm coordinates of the correct camber angle of is set to the third set coordinates N _3. Then, as shown in FIG. 7, the inclination Δcam nst _{= −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 Δcam nst _{= −70} and the slope Δcam nst _{= −60} connecting the second reference coordinate N and the third set coordinate N ₃ are calculated in advance (STEP 3 in FIG. 6). , And 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 actually measured slope (Δcam _j ) and each basic slope (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]
(Equation 6)
m− ₈₀ = Δcam nst _{= −80−} Δcamjst _{= −80} (6)
[0054]
(Equation 7)
m− ₇₀ = Δcam nst _{= −70} −Δcamjst _{= −70} (7)
[0055]
(Equation 8)
m− ₆₀ = Δcam nst _{= −60−} Δcamjst _{= −60} (8)
[0056]
Thereby, differences m- ₈₀ , m- ₇₀ , and m- ₆₀ of the respective slopes are obtained. In the case of the camber angle, similarly to 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 inventor to show the amount of change. Thus, the difference _m -80 of each tilt _calculated, m _-70, estimate _{m 0} of the slope difference at a central axial position (0 mm) of the wheel mount 5 during running from _{m -60} is obtained (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 in STEP 6 of FIG.
[0058]
As described above, according to the present embodiment, the toe angle and the camber angle at the axial position of the wheel mounting portion 5 during traveling can be calculated very quickly without applying the same load to the vehicle body as 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 (a position -60 mm from the traveling time in the present embodiment) without detaching the vehicle body 2 from the hanger 1. Alignment can be measured efficiently and productivity can be improved.
[0059]
The above-described measurement start position and the interval between the measurement positions are appropriately determined according to the characteristics of the suspension of the vehicle type to be measured, and are set to the dimensions adopted in the measurement of the toe angle and the camber angle in the present embodiment. It is not limited. In addition, as the interval between the measurement positions is set shorter, the measurement accuracy can be increased.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a schematic configuration of an alignment measuring device according to an embodiment of the present invention.
FIG. 2 is an explanatory view of the operation of a wheel mounting portion raising means.
FIG. 3 is an explanatory diagram of a second measuring means.
FIG. 4 is a flowchart showing 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 showing 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 (body support means), 2 ... Body, 3 ... Wheel alignment measuring device, 5 ... Wheel mounting part, 6 ... Wheel mounting part raising means, 7 ... First measuring means, 8 ... Second measuring means.

Claims (4)

In a vehicle wheel alignment measuring method for measuring a toe angle of a vehicle wheel,
A wheel mounting portion raising step of raising and lowering the wheel mounting portion to a predetermined height set below the position of the wheel mounting portion during traveling of the vehicle, supporting the vehicle body so that the wheel mounting portion can be raised and lowered,
Measuring step of measuring the position and toe angle of the wheel mounting part raised by the wheel mounting part raising step,
The measuring step includes, as first reference coordinates, coordinates including a position of the wheel mounting portion measured at the start of the lifting of the wheel mounting portion in the wheel mounting portion raising step and a 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 as measurement coordinates, A first calculation step of calculating the inclination of each straight line connecting the reference coordinates of Step 1 and each measurement coordinate;
Coordinates consisting of the position of the wheel mounting portion in the first reference coordinates and a correct toe angle predetermined in correspondence with the position are defined as second reference coordinates, and the position of the wheel mounting portion in each of the measurement coordinates is Using a plurality of coordinates consisting of a correct toe angle predetermined for each position as set coordinates, the inclination of each straight line connecting the second calculated reference coordinates and each set coordinate, and the first reference A second calculating step of calculating an estimated value of the toe angle of the position of the wheel mounting portion when the vehicle is running, based on the difference between the coordinates and the inclination of each straight line connecting the measured coordinates. How to measure the wheel alignment of a car. In a wheel alignment measurement method of a vehicle for measuring a camber angle of a vehicle wheel,
A wheel mounting portion raising step of raising and lowering the wheel mounting portion to a predetermined height position set below the position of the wheel mounting portion during traveling of the vehicle, supporting the vehicle body by freely raising and lowering the wheel mounting portion,
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 includes, as first reference coordinates, coordinates including a position of the wheel mounting portion measured at the time of starting the raising of the wheel mounting portion in the wheel mounting portion raising step and a 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 as measurement coordinates, A first calculation step of calculating the inclination of each straight line connecting the reference coordinates of Step 1 and each measurement coordinate;
Coordinates consisting of the position of the wheel mounting portion in the first reference coordinates and the correct camber angle predetermined in correspondence with the position are defined as the second reference coordinates, and each position of the wheel mounting portion in each of the measurement coordinates is Using a plurality of coordinates consisting of a predetermined correct camber angle corresponding to each position as set coordinates, the inclination of each straight line connecting the second reference coordinates calculated in advance and each set coordinate, and the first reference A second calculating step of calculating an estimated value of the camber angle of the position of the wheel mounting portion when the vehicle is running, based on the difference between the inclination of each straight line connecting the coordinates and each measured coordinate. How to measure the wheel alignment of a car. In a vehicle wheel alignment measurement device that measures the toe angle of a vehicle wheel,
Vehicle body supporting means for supporting the vehicle body by allowing the wheel mounting portion to move up and down,
A wheel mounting part lift provided at a position below the vehicle body supported by the vehicle body supporting means and raising the wheel mounting part to a predetermined height position set below the position of the wheel mounting part during traveling of the vehicle Means,
First measuring means provided on the wheel mounting portion raising means for measuring the height position of the wheel mounting portion;
A second measuring means provided on the wheel mounting part raising means for measuring the toe angle of the axle via the wheel mounting part;
The height position by the first measuring means is set at predetermined intervals from a position at which the wheel mounting portion is raised by the wheel mounting portion raising means to a position at which the wheel mounting portion is raised to a predetermined height position. Measurement control means for performing measurement and measurement of the toe angle by the second measurement means;
And a toe angle calculating means for calculating a toe angle corresponding to the position of the wheel mounting part when the vehicle is running, based on the respective measurement values obtained by the first measuring means and the second measuring means. Car wheel alignment measurement device. In a vehicle wheel alignment measurement device that measures the camber angle of the vehicle wheel,
Vehicle body supporting means for supporting the vehicle body by allowing the wheel mounting portion to move up and down,
A wheel mounting part lift provided at a position below the vehicle body supported by the vehicle body supporting means and raising the wheel mounting part to a predetermined height position set below the position of the wheel mounting part during traveling of the vehicle Means,
First measuring means provided on the wheel mounting portion raising means for measuring the height position of the wheel mounting portion;
A second measuring means provided on the wheel mounting part raising means for measuring the camber angle of the axle via the wheel mounting part;
The height position by the first measuring means is set at predetermined intervals from a position at which the wheel mounting portion is raised by the wheel mounting portion raising means to a position at which the wheel mounting portion is raised to a predetermined height position. Measurement control means for performing measurement and measurement of the camber angle by the second measurement means,
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 of the first measuring means and the second measuring means. Car wheel alignment measurement device.

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