JP2006177886A - Measuring instrument for disk rotor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize technique for temporarily fixing a measuring instrument for measuring the deflection of a disk rotor on a vehicle, in a state with a wheel not removed. <P>SOLUTION: The measuring instrument 12 is used, being fixed on a suspension member fixing a brake caliper or the brake caliper fixed on the suspension member. The measuring instrument 12 comprises a support member 17, a pair of cantilevered members 20 and 21 positioned at the edge part of the support member 17, and non-contact type gap sensors 22 and 23, positioned at the edge parts of the cantilevered members 20 and 21. Furthermore, the support member 17 is fixed on the suspension member or the brake caliper, and the measuring instrument 12 comprises fixing means 14 and 15, fixed at positions allowing one gap sensor 23 to face the front face of the disk rotor and allowing the other gap sensor 22 to face the rear face of the disk rotor. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a technique for measuring runout of a disc rotor while the disc rotor is mounted on a vehicle.

A disk rotor is rotatably supported by a vehicle suspension member (for example, a knuckle arm) via a hub. A brake caliper is fixed to the suspension member.
When rotating, the front and back surfaces of the disk rotor are slightly swung in the direction of the rotation axis. Patent Document 1 discloses a technique for measuring the shake of the front and back surfaces of a disk rotor by a pair of gap sensors arranged to face the front and back surfaces of the disk rotor.

JP 2004-114747 A

However, the technique of Patent Literature 1 assumes that a pair of gap sensors is permanently installed in a vehicle and used, and does not temporarily fix a measurement tool for measurement to the vehicle. In the case where the gap sensor is permanently arranged in the vehicle, the vehicle may be designed as such. On the other hand, when the measuring tool is temporarily fixed to a vehicle that is not designed assuming that the gap sensor is fixed, a technique for temporarily fixing the measuring tool is required.
If the wheel is removed, there is a large space on the surface side of the disk rotor, so it is not difficult to fix the gap sensor at a position facing the surface of the disk rotor. If the gap sensor is fixed with reference to the ground, the gap sensor can be fixed at a position facing the surface of the disk rotor.
However, if the wheel is removed, it cannot be measured in the actual vehicle state. Of course, the runout of the disk rotor cannot be measured while running.
It is extremely difficult to fix the gap sensor at a position facing the surface of the disk rotor without removing the wheel. With the current technology, it is not possible to measure the disc rotor runout without removing the wheel.
The present invention realizes a technique for temporarily fixing a measuring tool capable of measuring the runout of a disk rotor to a vehicle without removing a wheel.

The measuring tool of the present invention is a tool for measuring the deflection of a disc rotor that is rotatably supported by a suspension member of a vehicle, and is fixed to the suspension member to which the brake caliper is fixed or to the suspension member. Used fixed to the brake caliper. The measuring tool includes a support member, a pair of cantilever members positioned at the distal end portion of the support member, and a non-contact type gap sensor positioned at the distal end portion of each cantilever member. Further, the supporting member is fixed to the suspension member or the brake caliper, and fixing means is provided to fix one gap sensor at a position facing the disk rotor surface and the other gap sensor facing the back surface of the disk rotor.
By using this measuring tool, it is possible to fix the gap sensor so that one gap sensor faces the surface of the disk rotor and the other gap sensor faces the back surface of the disk rotor without removing the wheel. Since this measuring tool does not interfere with the rotation of the disk rotor, the gap length changes from the front surface side gap sensor to the surface of the disk rotor while rotating the disk rotor, and from the back surface side gap sensor to the back surface of the disk rotor. It becomes possible to simultaneously measure the change in gap length. It is possible to simultaneously measure the disc rotor runout and the change in thickness of the disc rotor. If this measuring tool is used, it is not necessary to remove the wheel, so that it is possible to measure the runout of the disc rotor in the actual vehicle state.

It is preferable to use a magnet positioned with respect to the support member as the fixing means. The support member is preferably fixed to the suspension member or the brake caliper by the magnetic force.
When a magnet is used as the fixing means, the runout of the disk rotor can be measured without any modification to the actual vehicle. Moreover, the attaching / detaching operation of the measuring tool is simplified.

The fixing means is particularly preferably a magnet that is attracted to the plane of the bolt head that fixes the brake caliper.
Here, the bolt that fixes the brake caliper may be a bolt that fixes the brake caliper mount to the suspension member, or may be a bolt that fixes the brake caliper cylinder to the brake caliper mount.
The magnet is firmly fixed when attracted to a flat surface. However, there are few flat portions on the back side of the disk rotor. Among them, a bolt for fixing the brake caliper mount to the suspension member and a head of the bolt for fixing the brake caliper cylinder to the brake caliper mount provide a flat portion. When the support means is fixed using a magnet that is attracted to the flat surface of the bolt head that fixes the brake caliper, the support means is stably fixed.

Adjustable at least one of the angle of the support member relative to the fixing means, the distance from the fixing means to the support member, the protruding distance of the support member from the fixing means, the distance between the pair of cantilever members, and the position of the gap sensor relative to the cantilever members It is preferable that
A common measuring tool can be used for a plurality of types of vehicles.

The angle of the support member with respect to the fixing means, the distance from the fixing means to the support member, the protruding distance of the support member from the fixing means, the distance between the pair of cantilever members, and the position of the gap sensor with respect to the cantilever members can be adjusted. It is particularly preferred.
In addition to using a common measurement tool for multiple types of vehicles, moving the movable part over time allows the pair of gap sensors to move to the desired position while avoiding interference with obstacles. Can be adjusted.

It is preferable to further include means for detecting the rotation angle of the disk rotor.
When the rotation angle detecting means is provided, it is possible to associate the rotation angle of the disk rotor with the shake of the disk rotor.

The preferred embodiment of the present invention is exemplified (Form 1)
It is a method of measuring runout of a disc rotor that is rotatably supported by a suspension member of a vehicle to which a brake caliper is fixed.
Using a pair of non-contact type gap sensors facing the front and back surfaces of the disk rotor and an encoder for detecting the rotation of the disk rotor,
From the output of the pair of gap sensors and the encoder when the disk rotor rotates, the deflection of the front and back surfaces of the disk rotor is measured in correspondence with the circumferential position of the disk rotor.

The main features of the embodiments described later will be described.
(1) The measuring tool is a magnet, an arm that can rotate to the magnet and has a variable arm length, a rod that can slide in a direction orthogonal to the arm, a second cantilever bracket that can slide on the rod tip, and a rod tip It has a fixed first cantilever bracket, a first gap sensor that can be advanced and retracted to the first cantilever bracket, and a second gap sensor that can be advanced and retracted to the second cantilever bracket. These members can be fixed at adjusted positions.
(2) When the magnet of the measuring tool is attracted to the flat surface of the bolt head provided on the back side of the brake caliper, the first gap sensor faces the surface of the disk rotor, and the second gap sensor is placed on the back surface of the disk rotor. It is fixed at the opposite position.
(3) The disk rotor measurement system includes a measurement tool, an encoder, a mounting plate, and a measurement unit.
(4) The mounting plate rotates together with the disk rotor. The encoder shaft is fixed to the mounting plate.
(5) The measurement unit has an amplifier and a display connected to the amplifier. The outputs of the first gap sensor, the second gap sensor, and the encoder are input to the amplifier.

An embodiment according to a disk rotor measurement system of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the disk rotor measurement system 10 includes a measuring tool 12, an encoder 102, a mounting plate 101 (not shown in FIG. 1, and shown in FIG. 8), and a measuring unit 99.
As shown in FIGS. 2 and 3, the measuring tool 12 includes a magnet 14, an arm 15, a support 16, a rod (support member) 17, a first cantilever bracket 20, a second cantilever bracket 21, and a first gap sensor 22. The second gap sensor 23 is provided. In the following, for convenience of explanation, coordinate axes including the x-axis, y-axis, and z-axis shown in FIGS. 2 and 3 are set.
The magnet 14 has a cylindrical shape, and a mounting surface 24 is formed on one surface. A screw hole 18 (see FIG. 3) is formed in the center of the other surface of the magnet 14.
The arm 15 is formed in a plate shape, and a long hole 25 is provided at one end portion 31 (see FIG. 4). As shown in FIG. 4, the first screw 26 is screwed into the screw hole 18 of the magnet 14 with the shaft portion passing through the long hole 25 of the arm 15. The width of the long hole 25 is set to be smaller than the diameter of the screw head of the first screw 26. When the first screw 26 is tightened, the arm 15 and the magnet 14 are fixed. The arm 15 can be slid along the long hole 25 by loosening the first screw 26, or can be rotated around the x-axis around the screw 26. A round hole 27 is formed in the other end 32 of the arm 15.

As shown well in FIGS. 2 and 3, the support 16 is formed in a cylindrical shape. The support 16 is fixed to the arm 15. A circular through hole 35 is formed in the support 16. The diameters of the through hole 35 of the support 16 and the round hole 27 of the arm 15 are the same. The support 16 is provided with a screw hole 28 (see FIGS. 3 and 4) penetrating in the diameter direction. A second screw 30 is screwed into the screw hole 28.
As shown well in FIG. 2, one side 33 of the rod 17 is formed in a round bar shape. The other side 34 of the rod 17 is formed in a square bar shape having a square cross section. One side 33 of the rod 17 passes through the through hole 35 of the support 16 and the round hole 27 of the arm 15. When the second screw 30 of the support 16 is tightened, the rod 17 and the support 16 are fixed. A groove 36 is formed on the other side 34 of the rod 17. As shown in FIG. 5, a long hole 37 is formed at the bottom of the groove 36. As shown in FIG. 3, a circular through hole 41 penetrating in the y-axis direction is provided at the tip portion 40 of the rod 17.

The first cantilever bracket 20 is a rectangular bar-like member having a rectangular cross section. As shown in FIG. 3, a screw hole 44 that opens to the end face is formed in one end 43 of the first cantilever bracket 20. A circular through hole 45 penetrating in the thickness direction is formed at the other end 46 of the first cantilever bracket 20. Further, the other end 46 of the first cantilever bracket 20 is provided with a screw hole 47 that opens to the end surface and communicates with the through hole 45. A screw 48 is screwed into the screw hole 47.
The third screw 55 is screwed into the screw hole 44 of the first cantilever bracket 20 with the shaft portion passing through the long hole 37 of the rod 17. The width of the long hole 37 is set to be smaller than the diameter of the screw head of the third screw 55. When the third screw 55 is tightened, the rod 17 and the first cantilever bracket 20 are fixed. The first cantilever bracket 20 can be slid in the x-axis direction along the long hole 37 by loosening the third screw 55, and can also be rotated around the y-axis.
A cylindrical first gap sensor 22 is inserted into the through hole 45 of the first cantilever bracket 20. Both end portions of the first gap sensor 22 protrude from the first cantilever bracket 20. When the female screw 48 is tightened, the first gap sensor 22 is fixed to the first cantilever bracket 20. When the grommet 48 is loosened, the axial position of the first gap sensor 22 with respect to the first cantilever bracket 20 can be adjusted. The first gap sensor 22 is a type of gap sensor that detects capacitance. The first gap sensor 22 is provided with a measurement surface 38. The first gap sensor 22 measures an interval (gap) between the measurement surface 38 and a measurement object (in this embodiment, a disk portion 81 (described later) of the disk rotor 67).

The second cantilever bracket 21 has the same shape as the first cantilever bracket 20. A screw hole 42 is provided at one end 50 of the second cantilever bracket 21, and a through hole 51 and a screw hole 53 are provided at the other end 52. A screw 54 is screwed into the screw hole 53.
The fourth screw 56 is screwed into the screw hole 42 of the second cantilever bracket 21 with the shaft portion passing through the through hole 41 of the rod 17. When the fourth screw 56 is tightened, the rod 17 and the second cantilever bracket 21 are fixed. When the fourth screw 56 is loosened, the second cantilever bracket 21 can be rotated around the y-axis.
The second sensor 23 has the same shape and the same function as the first gap sensor 22 and is inserted into the through hole 51 of the second cantilever bracket 21. When the female screw 54 is tightened, the second sensor 23 is fixed to the second cantilever bracket 21. When the grommet 54 is loosened, the axial position of the second sensor 23 relative to the second cantilever bracket 21 can be adjusted. The second sensor 23 is provided with a measurement surface 39.

The measurement surface 38 of the first gap sensor 22 and the measurement surface 39 of the second sensor 23 need to be accurately parallel to the surface of the disk portion 81 of the disk rotor 67 (facing each other with high accuracy). If they are not accurately arranged in parallel, the deflection of the disk portion 81 cannot be measured accurately. For this reason, before attaching the sensors 22 and 23 to the brackets 20 and 21, the axes of the through holes 45 of the first cantilever bracket 20 and the through holes 51 of the second cantilever bracket 21 are aligned with high accuracy. As will be described in detail later, the disk unit 81 is disposed between the first gap sensor 22 and the second sensor 23, and the shake is measured in this state. Accordingly, if the axes of the through hole 45 and the through hole 51 are accurately aligned, the measurement surface 38 of the first gap sensor 22 and the back surface of the disk portion 81, the measurement surface 39 of the second sensor 23, and the disk portion 81. Can be arranged in parallel with high accuracy.
When the axes of the through hole 45 and the through hole 51 are accurately aligned, as shown in FIG. 6, the screws 55 and 56 and the screw screws 48 and 54 are loosened before the sensors 22 and 23 are attached. The pivoting jig 60 is passed through the through hole 45 of the one cantilever bracket 20 and the through hole 51 of the second cantilever bracket 21. The pivoting jig 60 is a round bar, and the diameter thereof is the same as the diameter of the sensors 22 and 23. Accordingly, the axes of the through hole 45 and the through hole 51 coincide with each other with high accuracy in a state in which the axial jig 60 has passed. If the first cantilever bracket 20 and the second cantilever bracket 21 are fixed to the rod 17 by tightening the screws 55 and 56, and the sensors 22 and 23 are attached after removing the pivoting jig 60, these shafts are also accurate. Match.

  As shown in FIG. 1, the measurement unit 99 includes an amplifier 92 and a display device 93 connected to the amplifier 92. Outputs of the first gap sensor 22 and the second sensor 23 are input to the amplifier 92. For the display device 93, for example, a personal computer can be employed.

In this embodiment, the encoder 102, the mounting plate 101, and the measuring tool 12 are mounted on the front suspension of an automobile. FIG. 7 shows the front suspension 62 of the automobile. One end 71 of the upper arm 63 is rotatably connected to a vehicle body (not shown). The other end 70 of the upper arm 63 is rotatably connected to the upper end 74 of the knuckle arm 64. One end 73 of the lower arm 65 is rotatably connected to the vehicle body. The other end 72 of the lower arm 63 is rotatably connected to the lower end 75 of the knuckle arm 64.
A hub 66 is rotatably attached to the knuckle arm 64 via a sleeve 76 (not shown in FIG. 7; shown in FIG. 8). A disc rotor 67 and a wheel 68 are attached to the hub 66. A tire 69 is attached to the wheel 68. The tire 69 is supported by a link mechanism formed by the upper arm 63, the knuckle arm 64, and the lower arm 65 through a sleeve 76, a hub 66, and a wheel 68 so as to be movable in the vertical direction.

As shown in FIG. 8, the sleeve 76 is fixed to the knuckle arm 64 by a bolt 77 (the tire 69 is not shown in FIG. 8). A substantially disk-shaped dust cover 79 is sandwiched between the sleeve 76 and the knuckle arm 64. The hub 66 is rotatably attached to the sleeve 76 by a bearing 80. A plurality of through holes 84 are formed in the hub 66 along the circumferential direction.
The disc rotor 67 has a disc-shaped disc portion 81 and a stepped portion 82 formed in the center portion and facing outward. The step portion 82 is formed with a plurality of screw holes 83 penetrating in the thickness direction and arranged along the circumferential direction. The bolt 78 that has passed through the through hole 84 of the hub 66 is screwed into the screw hole 83 of the step portion 82 of the disk rotor 67, so that the disk rotor 67 is attached to the hub 66.
A plurality of attachment holes 107 are formed in the wheel 68 along the circumferential direction. A bolt 78 protruding from the stepped portion 82 of the disk rotor 67 is inserted into the mounting hole 107.

The mounting plate 101 is disk-shaped and has a plurality of through holes 105 along the circumferential direction. The mounting plate 101 is attached to the hub 66 via the wheel 68 and the disc rotor 67 by inserting the bolts 78 into the through holes 105 and screwing the nuts 108 into the bolts 78 in this state. Accordingly, the mounting plate 101 rotates together with the wheel 68 and the disk rotor 67.
When the mounting plate 101 is not attached, that is, when the disk rotor measurement system 10 is not used, the wheel 68 is directly tightened with the nut 108.
The encoder 102 is disposed outside the mounting plate 101 while being positioned on the support member 104. Although described later in detail, the support member 104 is fixed to the body of the automobile. The support member 104 restrains the main body of the encoder 102 so as not to rotate, and can absorb the movement of the mounting plate 101 due to the swing of the front suspension 62 and the change in the angle of the wheel 68 due to the steering being turned off. it can. The shaft 103 of the encoder 102 is connected and fixed to the central portion of the mounting plate 101. Therefore, the rotation angle of the disk rotor 67 is detected by the encoder 102. As shown in FIG. 1, the output of the encoder 102 is output to the amplifier 92 of the measurement unit 99.

  As shown in FIG. 1, a brake caliper 91 is mounted so as to straddle the disk portion 81 of the disk rotor 67. The brake caliper 91 has an inner caliper mount 87 and an outer caliper cylinder 88. The brake caliper 91 is attached to the knuckle arm 64. The caliper mount 87 and the caliper cylinder 88 are fixed by two bolts (bolt heads 86 and 90 of the bolt are shown in FIG. 1). The caliper cylinder 88 has a built-in piston. When the piston is driven by hydraulic pressure, the two brake pads are brought close to each other. The approaching brake pad sandwiches the disk portion 81 of the disk rotor 67. Part of the outer periphery of the dust cover 79 is notched (hereinafter, the portion is referred to as a “notch portion 94”). A brake caliper 91 is disposed in the notch 94.

A procedure for measuring the deflection of the disk portion 81 of the disk rotor 67 using the disk rotor measurement system 10 will be described.
(1) Jack up the car and remove the wheel 68 from the hub 66. Then, the thickness of the disk part 81 is measured with calipers or the like. This measurement is performed because the thickness of the disk portion 81 varies depending on the vehicle type. If the type of the disc rotor 67 is known in advance and the thickness of the disc portion 81 is known, this measurement need not be performed.
(2) The distance between the first cantilever bracket 20 and the second cantilever bracket 21 of the measuring tool 12 is adjusted according to the measured thickness of the disk portion 81. Specifically, the third screw 55 and the fourth screw 56 are loosened. Then, the first cantilever bracket 20 is slid. In the adjustment, the sensors 22 and 23 are sandwiched between the sensors 22 and 23 in consideration of the amount of the sensors 22 and 23 protruding from the brackets 20 and 21. At this time, the axis of the through hole 45 of the first cantilever bracket 20 and the axis of the through hole 51 of the second cantilever bracket 21 are made to coincide with each other with high accuracy using the above-described pivoting jig 60. In this state, the first cantilever bracket 20 and the second cantilever bracket 21 are fixed to the rod 17 by tightening the third screw 55 and the fourth screw 56.
(3) The sensors 22 and 23 are inserted into the through holes 45 and 51 of the brackets 20 and 21. The sensors 22 and 23 are slid so that the distance A (see FIG. 3) between the first gap sensor 22 and the second sensor 23 is larger by 0.5 to 1.0 mm than the measured thickness of the disk portion 81. adjust. And the grommet screws 48 and 54 of the brackets 20 and 21 are tightened, and the sensors 22 and 23 are fixed.
(4) With the first screw 26 and the second screw 30 loosened, the mounting surface 24 of the magnet 14 is brought closer to the top surface of the bolt head 86 as shown in FIG. Install. Next, the arm 15 is rotated around the first screw 26 of the magnet 14 and the arm 15 is slid with respect to the magnet 14 so that the rod 17 passes through the notch 94 of the dust cover 79. In this state, the first screw 26 is tightened, and the arm 15 is fixed to the magnet 14.
(5) The rod 17 is slid and rotated with respect to the support 16, and the sensors 22 and 23 are adjusted so as to be arranged at a portion to be measured in the radial direction of the disk portion 81. At this time, the distance between the front surface of the second sensor 23 and the disk portion 81 and the distance between the first gap sensor 22 and the back surface of the disk portion 81 are made equal while viewing the display on the display 93.
(6) The wheel 68, the mounting plate 101, and the encoder 102 are mounted. And jack down the car.
(7) The setup is now complete. When the disk rotor 67 rotates as the automobile travels, the distance between the second sensor 23 and the surface of the disk part 81 and the distance between the first gap sensor 22 and the back surface of the disk part 81 along the circumferential direction of the disk part 81. Is displayed on the display device 93 in a state associated with the rotation angle of the disk rotor 67 detected by the encoder 102. The display 93 stores these data simultaneously. From the measured interval, the deflection of the disk unit 81 can be obtained. From the rotation angle of the disk rotor 67, it is possible to know which position in the circumferential direction of the disk portion 81 the obtained shake is.
It is also possible to measure the deflection of the disk portion 81 by rotating the disk rotor 67 with the automobile jacked up. In that case, the support member 104 of the encoder 102 may be fixed to the ground.

9 shows the measured distance between the second sensor 23 and the surface of the disk portion 81 (hereinafter referred to as “distance D1”), and the distance between the first gap sensor 22 and the back surface of the disk portion 81 (hereinafter referred to as “D2”). Say). The horizontal axis corresponds to the rotation angle (degree) of the disk rotor 67 detected by the encoder. The vertical axis corresponds to the distances D1 and D2 (μm) and the values obtained by adding the distances D1 and D2. FIG. 9 is for one rotation of the disk rotor 67.
As can be seen from FIG. 9, as a whole, the distance D1 tends to be larger than the distance D2. The curves of the interval D1 and the interval D2 indicate the shake of the disk portion 81. Regarding the value obtained by adding the interval D1 and the interval D2, the difference between the maximum value point 59 and the minimum value point 58 is the maximum wall thickness difference of the disk portion 81 (the portion having the largest thickness and the smallest thickness). Difference).

A hexagonal recess corresponding to the shape of the bolt head 86 can be formed on the mounting surface 24 of the magnet 14 of the measuring tool 12. By inserting the bolt head 86 into the recess, the measuring tool 12 can be mounted more reliably.
The measuring tool 12 can also be fixed to the knuckle arm 64.

Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.
In addition, the technical elements described in the present specification or drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology illustrated in the present specification or the drawings achieves a plurality of objects at the same time, and has technical utility by achieving one of the objects.

The disk rotor measurement system in the set up state is shown. The perspective view of a measuring tool. The side view of a measuring tool. FIG. 4 is a view taken along line IV-IV in FIG. 3. FIG. 5 is a view taken along line VV in FIG. 3. Explanatory drawing of the procedure which makes the axis | shaft of a 1st gap sensor and a 2nd sensor correspond. Schematic diagram of the front suspension. Detailed sectional drawing of a front suspension. The graph which illustrates the space | interval measurement result of a 1st gap sensor, a 2nd sensor, and a disk rotor surface.

Explanation of symbols

10: disk rotor measurement system 12: measuring tool 14: magnet 15: arm 16: support 17: rod 18: screw hole 20: first cantilever bracket 21: second cantilever bracket 22: first gap sensor 23: second Sensor 24: Mounting surface 25: Long hole 26: 1st screw 27: Round hole 28: Screw hole 30: 2nd screw 31: One end 32: The other end 33: One side 34: The other side 35: Through hole 36 : Groove 37: Long hole 38, 39: Measurement surface 40: Tip part 41: Through hole 42: Screw hole 43: End part 44: Screw hole 45: Through hole 46: End part 47: Screw hole 48: Female screw 50: End Portion 51: Through hole 52: End 53: Screw hole 54: Screw screw 55: Third screw 56: Fourth screw 58: Minimum value point 59: Maximum value point 60: Axing jig 62: Front suspension 63: upper arm 64: knuckle arm 65: lower arm 66: hub 67: disc rotor 68: wheel 69: tire 70: other end 71: one end 72: other end 73: one end 74: upper end 75: lower end 76: sleeves 77, 78 : Bolt 79: Dust cover 80: Bearing 81: Disk part 82: Step part 83: Screw hole 84: Through hole 86: Bolt head 87: Caliper mount 88: Caliper cylinder 90: Bolt head 91: Brake caliper 92: Amplifier 93: Display 94: Notch 99: Measuring unit 101: Mounting plate 102: Encoder 103: Shaft 104: Support member 105: Through hole 107: Mounting hole 108: Nut

Claims (6)

A disk rotor measuring tool that is rotatably supported by a suspension member of a vehicle to which a brake caliper is fixed.
A support member;
A pair of cantilever members positioned at the tip of the support member;
A non-contact type gap sensor positioned at the tip of each cantilever member;
A fixing means for fixing the support member to the suspension member or the brake caliper, and fixing the gap sensor at a position where one gap sensor faces the surface of the disk rotor and the other gap sensor faces the back surface of the disk rotor;
A disk rotor measuring tool.   2. The measuring tool according to claim 1, wherein the fixing means includes a magnet positioned with respect to the support member, and the support member is fixed to the suspension member or the brake caliper by the magnetic force thereof.   3. The measuring tool according to claim 2, wherein the fixing means includes a magnet that is attracted to a plane of a bolt head for fixing the brake caliper.   Adjustable at least one of the angle of the support member relative to the fixing means, the distance from the fixing means to the support member, the protruding distance of the support member from the fixing means, the distance between the pair of cantilever members, and the position of the gap sensor relative to the cantilever members The measuring tool according to any one of claims 1 to 3, wherein:   The angle of the support member with respect to the fixing means, the distance from the fixing means to the support member, the protruding distance of the support member from the fixing means, the distance between the pair of cantilever members, and the position of the gap sensor with respect to the cantilever members can be adjusted. The measuring tool according to claim 1, wherein the measuring tool is provided.   6. The measuring tool according to claim 1, further comprising means for detecting a rotation angle of the disk rotor.

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