JP3394421B2 - Suspension alignment measuring device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspension alignment measuring apparatus mainly applied to a rear suspension of an automobile, and more particularly to a measuring apparatus used for alignment adjustment in a suspension sub-assembly stage.

[0002]

2. Description of the Related Art Conventionally, as an alignment measuring apparatus of this type, according to Japanese Patent Publication No. 3-61888, a jig means for supporting a suspension subassembly in which a suspension is assembled in a subframe at a fixed position, and a jig means. Support frame arranged laterally, a probe that can directly contact the reference plane orthogonal to the axle of the wheel mounting member pivotally supported by the knuckle of the suspension, and the wheel mounting member can be centered and gripped A gripping means and a measuring head that supports the measuring element so as to be tiltable about a camber axis in the front-rear direction and has a detecting means for detecting a tilt angle of the measuring element around the camber axis. It is known that a support frame is supported so as to be able to be pushed inward in the lateral direction via a pressing means so that it contacts the reference surface of the wheel mounting member.

In this device, the gripping means is composed of a plurality of gripping pieces which are pivotally attached to the probe in a freely openable and closable manner, and the measuring head is pushed laterally inward to move the probe to the reference surface of the wheel mounting member. And the gripping piece is closed to grip the peripheral surface of the wheel mounting member. According to this
The tracing stylus tilts about the camber axis according to the change of the camber by the alignment adjusting member of the suspension, and the alignment adjustment can be performed while the camber is measured by the detecting means.

Although the toe is not measured in the above publication, the toe of the probe is supported on the measuring head so that the probe can be tilted around the vertical toe axis. The toe can also be measured by attaching a detecting means for detecting the tilt angle about the axis.

[0005]

By the way, when the wheel mounting member is gripped by the gripping means, the camber and toe are not constant before the alignment adjustment, and the axis of the wheel mounting member with respect to the gripping center of the gripping means, That is, the wheel mounting member may be gripped while the axle is tilted. When the gripping means is attached to the tracing stylus as in the above conventional example, the center line of the tracing stylus becomes the gripping center of the gripping means, and when the wheel mounting member is gripped with the axle tilted with respect to the gripping center, the measurement is performed. The child does not come into direct contact with the reference surface of the wheel mounting member, and the camber or toe cannot be accurately measured.

In view of the above points, the present invention provides an alignment measuring device capable of accurately measuring a camber and a toe by accurately contacting a tracing stylus with a reference surface of a wheel mounting member. That is the issue.

[0007]

[Means for Solving the Problems] In order to solve the above problems,
The present invention is a device for measuring the alignment of a suspension at the subassembly stage of the suspension,
Jig means for supporting the suspension subassembly in a fixed position, a support frame arranged laterally of the jig means, and a plane perpendicular to the reference plane orthogonal to the axle of the wheel mounting member pivotally supported by the knuckle of the suspension. An abutting contact point, a gripping means for centering and holding the wheel mounting member, and a contact point for supporting the contact point so as to be tiltable about a camber axis in the front-rear direction and a toe axis in the vertical direction. A camber detecting means for detecting a tilting angle around the camber axis and a measuring head equipped with a toe detecting means for detecting a tilting angle around the toe axis of the tracing stylus are provided. In a structure in which a supporting frame is movably supported inward in the lateral direction via a pressing means so as to come into contact with a reference surface, a plurality of gripping arms constituting the gripping means are provided on the supporting frame. An elastic roller composed of an elastic body that is supported so as to be openable and closable in the radial direction and abuts on the peripheral surface of the wheel mounting member is provided on each gripping arm with a roller axis parallel to the tangential direction of each roller abutting point of the wheel mounting member as the center. It is rotatably supported.

According to the present invention, the tilting of the tracing stylus is not restricted by the gripping means, and the pushing of the measuring head inward in the lateral direction ensures that the tracing stylus is flush with the reference surface of the wheel mounting member. Abut. Therefore, the camber and toe can be accurately measured by each detecting means.

On the other hand, according to the present invention, since the gripping means does not tilt about the camber axis or the toe axis, tilting in the camber direction or the toe direction due to the alignment adjustment of the wheel mounting member may be restricted. However, in the present invention, since each gripping arm serving as gripping means abuts on the peripheral surface of the wheel mounting member via the elastic roller, the elastic deformation and rotation of the elastic roller allow the wheel mounting member to tilt, which hinders alignment adjustment. Does not occur. In this case, if the elastic roller is supported by the gripping arm so as to be slidable in the axial direction of the roller shaft, the degree of freedom of the wheel mounting member is further increased.

By the way, in order to center the wheel mounting member, it is necessary to grip at least three places around the periphery. In this case, three gripping arms may be provided, but this complicates the structure. On the other hand, a pair of upper and lower gripping arms are provided, and one gripping arm pivotally supports two elastic rollers that contact the circumferential surface of the wheel mounting member on both sides in the circumferential direction of the vertical diameter line of the wheel mounting member, If one elastic roller that abuts the peripheral surface of the wheel mounting member on the diameter line is pivotally supported on the other gripping arm, the wheel mounting member can be gripped by the two gripping arms without impairing the centering property. In this case, a synchronization mechanism that opens and closes both gripping arms in synchronization is required. This synchronization mechanism includes a downwardly extending rack connected to the upper grasping arm and an upwardly extending rack connected to the lower grasping arm. , And a pinion that meshes with both racks and that is axially supported by the support frame.

If the support frame can be driven in the vertical direction and a displacement detecting means for detecting the vertical displacement of the support frame is provided, changes in camber and toe due to vertical movement of the suspension can be measured. Further, if a means for pressing the support frame in the front-back direction is provided, changes in camber and toe when a force in the front-back direction is applied during braking can be measured.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment in which the present invention is applied to an alignment measuring apparatus for a multi-link type suspension shown in FIG. 9 used as a rear suspension of an automobile will be described.

The multi-link suspension is a suspension in which a lower arm connected to the lower part of the knuckle A and an upper arm connected to the upper part are each composed of a plurality of links. In the suspension shown in FIG. 9, the lower arm is connected to the lower part of the knuckle A. Consists of a trailing link B extending diagonally forward to the front end, a lower link C extending horizontally in the middle of the lower part of the knuckle A, and a control link D extending horizontally to the lower end of the knuckle A. Then
The upper arm is composed of a laterally extending upper link E connected to the upper part of the knuckle A and an obliquely rearward leading link F connected to the upper part of the knuckle A. Each of these links is connected to the subframe G. The suspension subassembly is assembled. The connecting position of the control link D with respect to the sub-frame G can be laterally adjusted by an alignment adjusting member Da composed of an eccentric cam, and the connecting position of the control link D is adjusted so that the toe and camber measured by the alignment measuring device have predetermined values. Adjust the position. In the figure, H is a wheel mounting member composed of a brake disc pivotally supported by the knuckle A.

As shown in FIG. 1, the alignment measuring apparatus comprises jig means 2 arranged on the bed 1 and measuring means 3 and 3 arranged on both sides of the jig means 2.

The jig means 2 supports the suspension sub-assembly at a fixed position, and the suspension sub-assembly carried in by a conveyor (not shown) arranged so as to intersect the bed 1 is provided on both left and right sides of the sub-frame G. It is composed of a pair of left and right work supports 4 and 4 which can be lifted up and down supported in a section, and undulating clamp arms 5 and 5 which are provided in front and rear pairs corresponding to the respective work supports 4. Each work receiver 4 is moved up and down by the cylinder 4a, and the clamp arm 5 is undulated by the cylinder 5a. Then, when the suspension sub-assembly is carried in, first the clamp arm 5 is erected, then the work receiver 4 is lifted to lift up the sub-frame G, and the sub-frame G is sandwiched between the clamp sub-frame 5 and the clamp arm 5. Support in place.

The measuring means 3 is, as shown in FIGS. 2 to 5,
The column 6 is moved forward and backward by the cylinder 6a along the rail 6b on the bed 1 to the laterally outward retracted position and the laterally inward measured position, and the column 6 is supported by the two cylinders 7a and 7b.
An elevating frame 7 that is moved up and down along a rail 7c fixed to
The elevating frame 7 is provided with a support frame 8 that is pushed forward and backward along a rail 8c fixed to the elevating frame 7 by a pair of cylinders 8a and 8b. The support frame 8 has a lateral side plate portion 8d and a front side plate portion 8f coupled to the side frame portion 8d via a beam 8e, and has a reference plane Ha orthogonal to the axle of the wheel mounting member H.
Head 1 for supporting a cup-shaped measuring element 9 facing the
0 is movably supported in the lateral direction on a guide block 8g attached to the side plate portion 8d, and a pair of upper and lower gripping arms 11 as gripping means for gripping the wheel mounting member H from above and below.
₁ , 11 ₂ are supported by the side plate portion 8f so as to be openable and closable in the vertical direction.

The two cylinders 7a, 7 for the lifting frame 7
b is mounted on a common connecting plate 7d with one side facing downward and the other side facing upward, and a piston rod extending downward from a downward facing cylinder 7a is mounted on a column 6 to form a reaction force receiver 6c whose position can be adjusted in the vertical direction. The piston rod extending upward from the upward cylinder 7b is connected to the arm 7e fixed to the elevating frame 7 protruding through the vertically elongated hole 6d formed in the column 6, and the cylinder 7a contracts from the neutral position shown in the drawing. The elevating frame 7 is lowered by the operation, and the elevating frame 7 is raised by the extending operation of the cylinder 7b. When the elevating frame 7 is moved up and down, the wheel mounting member H is moved up and down via the support frame 8 and the gripping arms 11 ₁ and 11 ₂ to simulate an upward bump operation and a downward rebound operation of the suspension with respect to the vehicle body. To be

A reflecting plate 12a is attached to the arm 7e, and an oscillating or optical distance sensor 12 for measuring the distance to the reflecting plate 12a is attached to the column 6, and the sensor 12 raises and lowers the frame. 7, that is, a displacement detecting means for detecting the vertical displacement of the support frame 8 is configured.

The pair of cylinders 8a, 8 for the support frame 8
b is attached to the upper end portion of the support frame 8 with one side facing forward and the other side facing backward, and the piston rods of the cylinders 8a and 8b are attached to the upper end portion of the elevating frame 7 in a pair of front and rear reaction force receivers 7f. The support frame 8 is pushed rearward by the extension movement of the cylinder 8a facing forward, and the support frame 8 is pushed forward by the extension movement of the cylinder 8b facing backward so that the force in the front-back direction during braking or the like is applied to the suspension. It is possible to simulate the state that acts on.

As shown in FIGS. 6 and 7, the measuring head 10 includes a head frame 10a and a first yoke 1 rotatable about a vertical toe shaft 10b pivotally supported by the head frame 10a.
0c and a second yoke 10e pivotally supported by the first yoke 10c and rotatable about a camber shaft 10d in the front-rear direction. And the second yoke 1
0e of the measuring element 9 attached to the toe shaft 10
It is tiltably supported around b and around the camber shaft 10d. Further, the head frame 10a is mounted with the toe detecting means 10f composed of a rotary encoder connected to the lower end of the toe shaft 10b, and the camber detecting means 10g composed of a rotary encoder connected to the front end of the camber shaft 10d is connected to the first yoke 10c. The detecting means 10f and 10g are used to detect the tilt angles of the probe 9 around the toe axis 10b and the camber axis 10d. The head frame 10a is further provided with a pair of cylinders 10h, 10h facing the side plate portion of the tracing stylus 9, and holding the tracing stylus 9 in a neutral posture by extending the cylinders 10h, 10h. I am able to do it.

The measuring head 10 is slidably supported in the lateral direction by a guide block 8g via a pair of guide bars 10i, 10i extending laterally outward from the head frame 10a, and is attached to the guide block 8g. Further, the measuring head 10 is pushed inward in the lateral direction by the cylinder 10j serving as the pushing means so that the tracing stylus 9 can be brought into contact with the reference surface Ha of the wheel mounting member H.

Each of the gripping arms 11 ₁ and 11 ₂ has a first movable frame 11b supported by a rail 11a fixed to a side plate portion 8f so as to be vertically movable, and a first movable frame 1 by a cylinder 11c.
It is composed of a second movable frame 11e that is moved forward and backward along a rail 11d fixed to 1b, and an arm body 11f attached to the second movable frame 11e. Upper grip arm 11
The first movable frame 11b _1, and the projection 11g is provided to protrude to the reverse side of the side plate portion 8f through vertical elongated hole 8h formed in the side plate portion 8f, downwardly on the rear surface upper portion of the side plate portion 8f The piston rod of the attached cylinder 11h is connected to the protrusion 11g. Racks 11i and 11i extending downward and upward are attached to the first movable frames 11b and 11b of the upper and lower gripping arms 11 ₁ and 11 _{2, respectively} , and the racks 11i and 11i are attached to the side plate portion 8f. The pinion 11j that meshes with is pivotally supported. Thus, the two gripping arms 11 ₁ and 11 ₂ are opened and closed in the vertical direction in synchronization with each other by the operation of the cylinder 11h with the opening height of the pinion 11j as the center of opening and closing. In FIG. 2, 11k is each rack 11i
Is a backup roller.

Arm body 11f of the upper gripping arm 11 _1.
Is provided with _two elastic rollers 13 ₁ and 13 _{2 that} come into contact with the peripheral surface of the wheel mounting member H on both sides in the circumferential direction of the vertical diameter line of the wheel mounting member H, and the lower gripping arm 11 is provided.
_{The second} arm body 11f is provided with an elastic roller 13 ₃ that abuts on the peripheral surface of the wheel mounting member H on the diameter line. These elastic rollers 13 ₁ , 13 ₂ , 13 ₃ are
A fitting shaft is slidably supported on each roller shaft 13a mounted on each arm body 11f and parallel to the tangent line of each roller contact point of the wheel mounting member H. Then, each elastic roller 13
₁ , 13 ₂ and 13 ₃ are elastically held by the springs 13b and 13b on both sides in the axial direction at the axial center of each roller shaft 13a. The elastic rollers 13 ₁ , 13 ₂ , 13 ₃ are made of an elastic body such as urethane rubber.

In the alignment adjustment, after the suspension sub-assembly is supported at a fixed position by the jig means 2 as described above, the columns 6 of each measuring means 3 are advanced to the measuring position and the elevating frame 7 is in the neutral position. Then, the upper and lower gripping arms 11 ₁ and 11 ₂ are closed and the peripheral surface of the wheel mounting member H is moved to
The individual elastic rollers 13 ₁ , 13 ₂ , 13 ₃ are gripped, and the wheel mounting member H is centered so as to face the probe 9.
Here, the neutral position of the elevating frame 7 is set to such a height that the wheel mounting member H is held at the vertical position (1G equivalent position).

Next, the second movable frame 11e of each of the gripping arms 11 ₁ and 11 ₂ is laterally inwardly pressed by the cylinder 11c with a pressing force of about 2 kg to 3 kg. According to this, the wheel mounting member H is pushed inward in the lateral direction via the elastic rollers 13 ₁ , 13 ₂ , 13 _3, and each link B, C,
D, E, F knuckle A side connection and subframe G
The play in the side connection is eliminated.

Next, the measuring head 10 is pushed laterally inward by the cylinder 10j to bring the probe 9 into contact with the reference surface Ha of the wheel mounting member H. At this time, initially, the measuring element 9 is held in the neutral posture by the cylinder 10h, and after the contact with the reference surface Ha of the wheel mounting member H, the tilt regulation of the measuring element 9 by the cylinder 10h is released. According to this, the tracing stylus 9 tilts following the reference surface Ha and directly contacts the reference surface Ha.

Next, the toe detected by the toe detecting means 10f and the camber detected by the camber detecting means 10g are predetermined by the alignment adjusting member Da for adjusting the connecting position of the control link D of the suspension with respect to the sub-frame G. Adjust the alignment to achieve the target value of.

The target values of the toe and camber when the wheel mounting member H is in the vertical neutral position are zero, and if the alignment adjusting member Da is loosened, the cylinder 10h is used to move the probe 9 to the neutral position. When the wheel mounting member H is abutted against the reference surface Ha of the wheel mounting member H while being restrained, the wheel mounting member H is corrected so that the toe and the camber become zero respectively. The alignment adjustment can be performed by tightening the alignment adjustment member Da.

Next, the elevating frame 7 is moved up and down from the neutral position by the cylinders 7a and 7b, the data from the distance sensor 12 and the data from the toe and camber detecting means 10f and 10g are sampled, and the wheel mounting member H is moved up and down. The changes in the toe and camber due to the directional displacement are measured, and the changes in the toe and camber when the support frame 8 is pressed in the front-rear direction by the cylinders 8a and 8b to apply the force in the front-rear direction are measured.

When the wheel mounting member H is tilted in the toe direction, the wheel mounting member H is held by the gripping arm 1.
It rotates about the vertical line with respect to 1 ₁ and 11 ₂ and displaces in the front-back direction.
₁ of the elastic roller 13 _1, 13 ₂ is rotated, the elastic roller 13 ₁ of the upper gripper arm 11 ₁ with a lower gripper arm 11 ₂ of the elastic roller 13 ₃ in the front-back direction displacement slides along its roller shaft 13a , 13 ₂ are elastically deformed while sliding along the respective roller shafts 13a, and thus the wheel mounting member H
Is allowed to tilt in the toe direction.

When the wheel mounting member H is tilted in the camber direction, the wheel mounting member H rotates with respect to the gripping arms 11 ₁ and 11 ₂ about a horizontal line in the front-rear direction and displaces in the vertical direction. Rotation of the elastic rollers 13 ₁ , 13 ₂ , 13 ₃ causes the elastic roller 13 ₃ of the lower gripping arm 11 ₂ to elastically deform due to vertical displacement and the elastic rollers 13 ₁ , 13 of the upper gripping arm 11 _{1 to} deform.
₂ is elastically deformed while sliding along the respective roller shafts 13a, thus allowing the wheel mounting member H to tilt in the camber direction.

As described above, since the wheel mounting member H is gripped by the _three elastic rollers 13 ₁ , 13 ₂ , 13 ₃ with a degree of freedom of tilting in the toe and camber directions, alignment adjustment and alignment can be performed. The dynamic change can be measured without any trouble.

However, the gripping arm 1 by the cylinder 11h
When the closing force of 1 ₁ and 11 ₂ , that is, the clamping force with respect to the wheel mounting member H is increased, the degree of freedom of tilting of the wheel mounting member H is impaired, and the knuckle A side connecting portion of each link of the suspension and the subframe G. The amount of elastic deformation of the rubber bush provided on the side connecting portion becomes larger than that when mounted on the vehicle body, and the alignment cannot be measured correctly. FIG. 8 shows the change in the toe due to the vertical displacement of the wheel mounting member H.
6 is a graph showing the positive side of vertical displacement as the rebound side, the negative side as the bump side, the positive side of the toe as the toe-in side, and the negative side as the toe-out side. In the figure, the line a is the standard toe change characteristic obtained from the design value of the suspension, and the line b is the toe change characteristic measured when the clamping force is 62 kgf.
The c line is the toe change characteristic measured when the clamping force was set to 124 kgf, and when the clamping force was set to 62 kgf, it matched the reference characteristic with considerable accuracy, but when the clamping force was set to 124 kgf, it changed from the reference characteristic. It will shift considerably. Further, when the clamping force is small, the centering property of the wheel mounting member H is deteriorated. Therefore, the clamping force is 50kgf ~
It should be set in the range of 70 kgf.

Although the tilt center of the wheel mounting member H and the tilt center of the tracing stylus 9 do not coincide with each other, the tracing stylus 9 is flush with the reference surface Ha of the wheel mounting member H as the wheel mounting member H tilts. Sliding against the reference surface Ha while contacting the
This sliding absorbs the disagreement between the tilt centers. Therefore, the tracing stylus 9 tilts at the same angle as the wheel mounting member H,
The toe and camber detecting means 10f and 10g for detecting the tilt angle of the tracing stylus 9 can accurately detect the toe and camber. However, the probe 9 using the cylinder 10j
If the pressing force of is too large, the reference surface H of the wheel mounting member H
The slidability of the probe 9 with respect to a is impaired, and the probe 9
If the pressing force of the
Since the surface straightness of the probe is impaired, the pressing force of the probe 9 is 9.0 kg.
It should be set in the range of f to 10.0 kgf.

Further, if the tracing stylus 9 interferes with the hub bolt Hb for wheel mounting which is planted on the reference surface Ha due to the sliding, the toe and the camber cannot be accurately measured. Here, the wheel mounting member H at the neutral position of the lifting frame 7
If the amount of misalignment with respect to the probe 9 is equal to or less than a predetermined allowable value, the hub bolt Hb is within the tilt range of the wheel mounting member H in the toe direction and the camber direction due to the vertical movement of the wheel mounting member H due to the elevation of the elevating frame 7. The stylus 9 does not interfere with. In this case, the elastic rollers 13 ₁ , 1
The elastic modulus of 3 ₂ and 13 ₃ is 1.5 kg /
If it is smaller than mm ^2, the centering accuracy of the wheel mounting member H is deteriorated, and the misalignment amount of the wheel mounting member H at the neutral position of the lifting frame 7 with respect to the probe 9 may exceed an allowable value. The elastic modulus of the elastic body is 2.3 kg.
If it is larger than / mm ^{2, the} degree of freedom of tilting of the wheel mounting member H is impaired, and the elastic deformation of the rubber bush provided at the connecting portion of each arm of the suspension becomes larger than when mounted in the actual vehicle, and the alignment is measured correctly. become unable. Thus, the elastic rollers 13 _1, 13 _2, 13 _3, modulus of longitudinal elasticity should form an elastic body in the range of ^{1.5kg / mm 2 ~2.3kg / mm 2} .

[0036]

As is apparent from the above description, according to the present invention, the tilting of the tracing stylus is not restricted by the gripping means, and the tracing stylus is surely flush with the reference surface of the wheel mounting member. In addition to being able to abut, the wheel mounting member can be gripped by the gripping means without impairing the degree of freedom of its tilting, and the toe and camber can be accurately measured.

[Brief description of drawings]

FIG. 1 is a perspective view of an example of the device of the present invention.

2 is a front view of the measuring means of the apparatus of FIG.

3 is a left side view of FIG.

FIG. 4 is a right side view of FIG.

5 is a plan view of FIG.

FIG. 6 is an enlarged cross-sectional view of the measuring head cut along the line VI-VI in FIG.

7 is a sectional view taken along the line VII-VII in FIG.

FIG. 8 is a graph showing changes in toe change characteristics due to clamping force.

FIG. 9 is a perspective view of the suspension.

[Explanation of symbols]

H Wheel mounting member Ha Reference surface 2 Jig means 7 Lifting frame 8 Support frame 9 Measuring element 10 Measuring head 10b Toe shaft 10d Camber shaft 10f Toe detecting means 10g Camber detecting means 10j Cylinder (pressing means) 11 ₁ , 11 ₂ Gripping arms 11i Rack 11j Pinion 12 Distance sensor (displacement detecting means) 13 ₁ , 13 ₂ , 13 ₃ Elastic roller 13a Roller shaft

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ identification code FI G01M 17/007 G01M 17/00 R (58) Fields investigated (Int.Cl. ⁷ , DB name) B62D 17/00 B62D 65 / 12 G01B 7/30 G01B 21/22 G01M 17/007

Claims (6)

(57) [Claims] 1. An apparatus for measuring suspension alignment at a subassembly stage of a suspension, comprising jig means for supporting the suspension subassembly in a fixed position, and a support frame arranged laterally of the jig means. A stylus that can be brought into direct contact with a reference plane orthogonal to the axle of the wheel mounting member that is pivotally supported by the knuckle of the suspension, a gripping means that can center and grip the wheel mounting member, and a stylus in the front-back direction. Camber detecting means for tiltably supporting the camber axis and the vertical toe axis and detecting the tilt angle of the probe around the camber axis, and toe detection for detecting the tilt angle of the probe around the toe axis. And a measuring head to which the measuring head is attached, and the measuring head is laterally attached to the support frame via a pressing means so that the tracing stylus contacts the reference surface of the wheel mounting member. In the case of being supported so as to be able to be pushed inward in the direction, a plurality of gripping arms constituting the gripping means are supported by a support frame so as to be openable and closable in the radial direction of the wheel mounting member, and each gripping arm is surrounded by the circumference of the wheel mounting member. An alignment measuring device for a suspension, wherein an elastic roller made of an elastic body that abuts a surface is rotatably supported around a roller shaft parallel to a tangential direction of each roller abutting point of a wheel mounting member. 2. The suspension alignment measuring apparatus according to claim 1, wherein the elastic roller is supported by the gripping arm so as to be slidable in the axial direction of the roller shaft. 3. A pair of upper and lower gripping arms are provided as the gripping arms, and one gripping arm has two elastic rollers abutting against the circumferential surface of the wheel mounting member on both sides in the circumferential direction of the vertical diameter line of the wheel mounting member. 3. The suspension alignment measuring device according to claim 1 or 2, wherein one elastic roller is supported on the other gripping arm on the diameter line and abuts on the peripheral surface of the wheel mounting member. . 4. A downwardly extending rack connected to an upper grasping arm, an upwardly extending rack connected to a lower grasping arm, and a pinion pivotally supported by the support frame, which meshes with both racks. 4. The suspension alignment measuring apparatus according to claim 3, wherein the rack and the pinion constitute a synchronization mechanism that opens and closes both gripping arms in synchronization. 5. The displacement detection means for detecting the displacement of the support frame in the vertical direction is provided while the support frame can be driven in the vertical direction.
The alignment measuring device for the suspension according to the item. 6. The suspension alignment measuring apparatus according to claim 1, further comprising means for pressing the support frame in the front-rear direction.