JP7149821B2 - Caliper inspection device and caliper inspection method - Google Patents

Description

The present invention relates to a caliper inspection device and a caliper inspection method.

There is a disc brake caliper having a pipe hole to which a pipe is connected and a detent hole for detenting the pipe (see Patent Document 1, for example).

JP 2012-107746 A

It is desirable to reduce the product defect rate of calipers.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a caliper inspection apparatus and a caliper inspection method capable of reducing the product defect rate of calipers.

To achieve the above object, the caliper inspection device according to the present invention comprises a guide rod and an enclosing head movably arranged with respect to the guide rod, the guide rod being inserted into the anti-rotation hole, the A filling head moves along the guide rod and is inserted into the pipe hole, and the caliper is inspected by supplying a fluid having a pressure different from the atmospheric pressure from the filling head.

A caliper inspection method according to the present invention includes the steps of inserting a guide rod into a detent hole, moving an encapsulation head along the guide rod and inserting it into a pipe hole, and moving the encapsulation head along the guide rod to a pressure different from atmospheric pressure. and a step of supplying a fluid under pressure.

According to the present invention, it is possible to reduce the product defect rate of calipers.

1 is a partially broken and partially cross-sectional front view showing a caliper inspection device and a caliper according to an embodiment of the present invention; FIG. 1 is a cross-sectional view showing a main part of a caliper to be inspected by a caliper inspection device according to one embodiment of the present invention; FIG.

An embodiment according to the present invention will be described based on the drawings. A caliper inspection device 10 of the present embodiment inspects a caliper 11 that constitutes a disc brake. Specifically, it inspects the caliper 11 that constitutes a disc brake for braking the rear wheels of a four-wheeled vehicle. be.

The caliper 11 brakes the rotation of a disk (not shown) that rotates together with the wheel to be braked, and includes a carrier 13 , a pair of brake pads 14 and a caliper body 15 .

The carrier 13 is a portion of the caliper 11 that is fixed to a non-rotating portion of the vehicle, and slidably supports the pair of brake pads 14 .

The caliper body 15 applies frictional resistance to the disc by pressing a pair of brake pads 14 supported by the carrier 13 against the disc. The caliper body 15 has slide pins 18 . Here, only one slide pin 18 is shown in FIG. 1 due to the fact that the caliper body 15 is partially cut away, but the caliper body 15 has two parallel slide pins 18 . The caliper body 15 is supported by the carrier 13 so as to be slidable on these sliding pins 18 . The caliper body 15 has a caliper body 21 to which a slide pin 18 is fixed and slidably supported by the carrier 13 via the slide pin 18, and a piston 22 slidably held by the caliper body 21. is doing.

The caliper body 21 includes a cylinder portion 25 arranged on the opposite side of one brake pad 14 from the other brake pad 14, a bridge portion 26 extending across the pair of brake pads 14, and the other brake pad 14. One of the brake pads 14 is integrally formed with a claw portion 27 arranged on the opposite side.

The cylinder portion 25 has a bottomed cylindrical shape that opens toward the claw portion 27 side, and the piston 22 is slidably inserted into the cylinder portion 25 . An electric parking brake mechanism 31 that electrically slides the piston 22 is attached to the outside of the bottom portion 30 of the cylinder portion 25 . A piston seal 33 that closes a gap between the piston 22 and the cylinder portion 25 is provided on the inner peripheral side of the cylindrical side wall portion 32 of the cylinder portion 25 . A fluid chamber 35 is defined between the cylinder portion 25 and the piston 22 and is closed by a piston seal 33 .

The caliper main body 15 advances the piston 22 toward the brake pad 14 by the hydraulic pressure introduced into the fluid chamber 35, and presses one brake pad 14 with the piston 22 to contact a disk (not shown). Then, the caliper main body 15 slides the slide pin 18 against the carrier 13 by the pressing reaction force of the piston 22 to move the cylinder portion 25 away from the disc, and the claw portion 27 moves the other brake pad 14 . is pressed into contact with the disc. In this manner, the caliper body 15 holds the brake pads 14 on both sides between the piston 22 and the pawl portion 27 and presses against the disc to generate frictional resistance and braking force.

A pipe hole 41 for supplying brake fluid to the fluid chamber 35 is formed through the cylindrical side wall portion 32 of the cylinder portion 25 along the radial direction of the side wall portion 32 . The piping hole 41 includes a counterbore 43 formed on the outer surface side of the side wall portion 32 , a chamfer 44 formed at the center position of the bottom surface of the counterbore 43 , and a screw hole portion 45 connecting the chamfer 44 and the liquid chamber 35 . have. The chamfer 44 has a tapered shape with a smaller diameter from the counterbore 43 toward the screw hole portion 45 . These counterbores 43, chamfers 44 and screw holes 45 are formed coaxially.

When the caliper 11 is assembled to the vehicle, a pipe 51 for brake fluid is connected to the pipe hole 41 at a plug 52 as shown in FIG. At that time, the seal ring 53, the plug 52 of the pipe 51, and the seal ring 54 are stacked in this order on the seat surface 46, which is the bottom surface of the counterbore 43, and the threaded shaft portion 56 of the union bolt 55 is inserted through the inside of these. be.

By screwing the threaded shaft portion 56 of the union bolt 55 into the threaded hole portion 45, the head portion 57 of the union bolt 55 and the side wall portion 32 of the caliper 11 are connected to the seal ring 53, the plug 52 of the pipe 51, and the plug 52 of the pipe 51. A seal ring 54 is sandwiched. Thereby, the plug 52 of the pipe 51 is fixed to the side wall portion 32 of the caliper 11 . The union bolt 55 communicates the inside of the pipe 51 with the liquid chamber 35 in this state. That is, brake fluid is supplied to the fluid chamber 35 of the caliper 11 via the pipe 51 and the union bolt 55 .

Further, in the side wall portion 32 of the cylinder portion 25 , a detent hole 61 is formed in line with the piping hole 41 from the outer surface of the side wall portion 32 to a midway position in the radial direction of the side wall portion 32 . The anti-rotation hole 61 has a chamfer 62 formed on the outer surface side of the side wall portion 32 and an insertion hole portion 63 inside the side wall portion 32 from the chamfer 62 . The chamfer 62 has a tapered shape with a smaller diameter toward the insertion hole portion 63 side. The chamfer 62 and the insertion hole portion 63 are formed coaxially and parallel to the pipe hole 41 .

A bent anti-rotation portion 66 formed at the tip of the plug 52 of the pipe 51 is inserted into the insertion hole portion 63 of the anti-rotation hole 61 . As a result, when the union bolt 55 is screwed into the pipe hole 41 , the plug 52 is restricted from rotating together, and the plug 52 is positioned with respect to the caliper 11 . That is, the anti-rotation hole 61 prevents the pipe 51 from rotating.

The caliper inspection device 10 of the present embodiment has the pipe 51 connected to the liquid chamber 35 of the caliper 11 before the pipe 51 is connected, that is, before the pipe 51, the seal ring 53, the seal ring 54 and the union bolt 55 are attached. A fluid higher than the atmospheric pressure is introduced from the hole 41 to move the piston 22 forward toward the pawl portion 27 to inspect the drag state of the brake pad 14 .

As shown in FIG. 1, the caliper inspection device 10 includes a set stand (not shown) for setting the caliper 11 at a predetermined set position of the caliper inspection device 10, and an inspection head 81 for inspecting the caliper 11 set on the set stand. , and a moving mechanism 82 for moving the inspection head 81 with respect to the caliper 11 set on the set table.

The moving mechanism 82 moves a support portion 85 at its tip in the axial direction and radial direction of the piston 22 , and a support hole 86 is formed in the support portion 85 . The support holes 86 have a cylindrical main inner peripheral surface 87 with a constant diameter, and a plurality of, specifically, two locations that are recessed radially outward from the main inner peripheral surface 87 and have a larger diameter than the main inner peripheral surface 87 . , and an annular holding groove 88 of the same shape. The main inner peripheral surface 87 and the plurality of holding grooves 88 are formed coaxially.

Each of the plurality of holding grooves 88 holds an O-ring 91 made of an elastic material such as urethane and having the same shape. The O-ring 91 has an outer diameter equal to the bottom diameter of the holding groove 88 and an inner diameter smaller than the main inner peripheral surface 87 when held in the holding groove 88 .

The inspection head 81 has an encapsulation head 102 with a cylindrical body 101 . The sealing head 102 is inserted inside the two O-rings 91 with interference at the body portion 101 . The outer diameter of the body portion 101 of the enclosing head 102 is smaller than the inner diameter of the main inner peripheral surface 87 of the support hole 86 . Therefore, the encapsulation head 102 is supported by the plurality of O-rings 91 so that it can move within the range of the support hole 86 in the entire radial direction of the body 101 with respect to the support portion 85 of the moving mechanism 82 . The encapsulating head 102 is supported by the plurality of O-rings 91 , and is urged by the elastic force of the O-rings 91 so that the central axis of the encapsulating head 102 is aligned with the support hole 86 . The encapsulation head 102 can also move in the axial direction of the barrel 101 with respect to the support portion 85 by sliding on the O-ring 91 . Between the enclosing head 102 and the supporting portion 85, there is provided a restricting portion (not shown) for restricting the relative rotation within a predetermined angle.

At one end in the axial direction of the sealing head 102, a cylindrical insertion port 105 having an outer diameter smaller than the outer diameter of the body portion 101 and slightly smaller than the minimum inner diameter of the screw hole portion 45 of the pipe hole 41 is provided. is formed. Between the insertion port 105 and the body portion 101 of the sealing head 102, a contact portion having an outer diameter larger than the outer diameter of the insertion port 105 and smaller than the outer diameter of the body portion 101 is provided on the side of the insertion port 105. A tapered portion 107 is formed on the body portion 101 side, and the outer diameter of the tapered portion 107 increases toward the body portion 101 side.

A seal ring 111 made of elastic and sealing material such as urethane having an outer diameter larger than the maximum inner diameter of the screw hole portion 45 is attached to the outer peripheral portion of the proximal end side of the insertion port 105 . . The outer diameter of the seal ring 111 is approximately equal to the maximum inner diameter of the tapered portion 107 . The body portion 101, the insertion port 105, the contact portion 106, the tapered portion 107, and the seal ring 111 are coaxially arranged.

The trunk portion 101 of the sealing head 102 is provided with a pipe connection portion 115 protruding radially outward at the end on the side of the insertion port 105 in the axial direction. A pipe connection portion 116 is provided at the end portion and protrudes axially outward. Although not shown, for example, the pipe connection portion 115 is connected to a pressure sensor, and the pipe connection portion 116 is connected to a compressed air supply source.

The inspection head 81 includes an annular fixed portion 121 fixed to the body portion 101 of the enclosing head 102, a buffer 122 attached to the outer peripheral portion of the fixed portion 121 so as to be parallel to the body portion 101, and the buffer 122. It has a guide rod 123 attached so as to be parallel to the trunk portion 101 on the side opposite to the fixing portion 121 .

The buffer 122 includes a base cylinder 131 fixed to the outer peripheral portion of the fixing portion 121 so as to be parallel to the body portion 101, and a slide pin 132 slidably supported by the base cylinder 131 and extending from the base cylinder 131. , a base portion 133 fixed to the extending tip side of the slide pin 132 , and a buffer spring 134 interposed between the base cylinder 131 and the base portion 133 . Here, in FIG. 1, since the caliper inspection device 10 is viewed from the front, the base cylinder 131, the slide pin 132 and the buffer spring 134 form one set. Specifically, two sets are provided in parallel, and a base portion 133 is fixed to two slide pins 132 . This restricts the rotation of the base portion 133 with respect to the fixed portion 121 and the sealing head 102 .

The slide pin 132 extends from the base cylinder 131 on the same side as the insertion port 105 with respect to the body portion 101 of the sealing head 102 . The slide pin 132 is arranged parallel to the body 101 and the insertion opening 105 of the enclosing head 102, relative to which their radial position is constant and moves only in their axial direction. The buffer spring 134 is elastically deformed when the base portion 133 approaches the base cylinder 131 and generates a biasing force in the direction of separating them.

The guide rod 123 is fixed to the opposite side of the base portion 133 from the slide pin 132 in the axial direction of the slide pin 132 . Guide rod 123 is parallel to slide pin 132 . Thus, the guide rod 123 is arranged parallel to the barrel 101 and the insertion opening 105 of the encapsulating head 102, relative to which their radial position is constant and moves only in their axial direction. The caliper inspection device 10 includes a guide rod 123 and an enclosing head 102 movably arranged with respect to the guide rod 123 .

The guide rod 123 is arranged on the same side as the insertion opening 105 in the inspection head 81 and extends in the same direction as the projection direction of the insertion opening 105 . The guide rod 123 extends from the insertion opening 105 to the opposite side of the support portion 85 in the axial direction. The guide rod 123 is columnar and has a cylindrical main outer peripheral surface 141 and a chamfer 142 formed on the outer peripheral portion of the distal end on the side opposite to the base portion 133 in the axial direction. The chamfer 142 has a tapered shape with a diameter that decreases with distance from the base portion 133 in the axial direction, and is formed coaxially with the main outer peripheral surface 141 .

The outer diameter of the main outer peripheral surface 141 of the guide rod 123 is slightly smaller than the inner diameter of the insertion hole portion 63 of the anti-rotation hole 61 , and the main outer peripheral surface 141 is removably fitted into the insertion hole portion 63 .

Here, the pipe hole 41 and the anti-rotation hole 61 of the caliper 11 are formed by machining, and the interval between the central axes of these is also formed with high accuracy. In the inspection head 81 , the interval between the central axes of the insertion port 105 and the guide rod 123 is the same as the interval between the central axes of the piping hole 41 and the anti-rotation hole 61 .

The inspection head 81 is provided with a wave washer 151 between the supporting portion 85 and the fixing portion 121 with the body portion 101 of the enclosing head 102 disposed inside. The wave washer 151 is elastically deformed when the fixing portion 121 of the inspection head 81 moves toward the support portion 85 in the axial direction, and generates an urging force in the direction of separating them.

As described above, the inspection head 81 is supported in a floating state with respect to the support portion 85 of the moving mechanism 82 via the plurality of O-rings 91 and wave washers 151 .

The caliper inspection device 10 is moved so as to aim at the position of the anti-rotation hole 61 of the caliper 11 set on a set table (not shown) with the guide rod 123 and aim at the position of the pipe hole 41 with the insertion port 105 of the sealing head 102. A movement path of the inspection head 81 by the mechanism 82 is programmed.

When the caliper inspection apparatus 10 inspects the caliper 11 set on the set table, the movement mechanism 82 moves the inspection head 81 along a set movement path based on the operator's start operation, for example. The moving mechanism 82 brings the inspection head 81 closer to the caliper 11, arranges the guide rod 123 coaxially to face the detent hole 61, and arranges the insertion port 105 of the sealing head 102 coaxially to face the pipe hole 41. , the inspection head 81 is advanced toward the caliper 11 along the axial direction of the guide rod 123 and the enclosing head 102 . Then, the guide rod 123 is first inserted into the anti-rotation hole 61 . That is, this step is the step of inserting the guide rod 123 into the anti-rotation hole 61 by the caliper inspection device 10 .

At this time, the radial position and angle of the anti-rotation hole 61 may slightly deviate from the guide rod 123 due to variations in manufacturing accuracy of the caliper 11 . At that time, the chamfer 142 at the tip of the guide rod 123 is guided by contacting the chamfer 62 at the mouth of the anti-rotation hole 61, and the inspection head 81 moves the plurality of O-rings 91 and wave washers 151. While being elastically deformed, the guide rod 123 is moved in the radial direction or the angle in the axial direction is changed so that the main outer peripheral surface 141 is fitted into the insertion hole portion 63 . Then, the guide rod 123 becomes coaxial with the insertion hole portion 63 .

As a result, the inspection head 81 including the guide rod 123 is positioned with respect to the caliper 11 in the radial direction of the anti-rotation hole 61 , and the enclosing head 102 is arranged parallel to the anti-rotation hole 61 . As a result, the piping hole 41 and the insertion port 105 of the sealing head 102 become parallel, and the distance from the central axis of the rotation prevention hole 61 and the guide rod 123 to the central axis of the piping hole 41 and the central axis of the insertion port 105 equal to the distance to

In this state, the moving mechanism 82 further advances the enclosing head 102 toward the caliper 11 . Then, the guide rod 123, the base portion 133, and the slide pin 132 contacting the bottom portion of the anti-rotation hole 61 remain stationary with respect to the caliper 11, and while compressing the buffer spring 134, the base cylinder 131, the fixed portion 121, and Enclosing head 102 advances toward caliper 11 .

At this time, the base cylinder 131 , the fixed part 121 and the encapsulating head 102 move along the guide rod 123 in the axial direction of the guide rod 123 with respect to the stopped guide rod 123 . Then, the insertion port 105 of the sealing head 102 is inserted into the piping hole 41 and fitted. That is, this step is a step of moving the enclosing head 102 along the guide rod 123 by the caliper inspection device 10 and inserting it into the pipe hole 41 .

At this time, since the guide rod 123 is fitted in the anti-rotation hole 61 as described above, the pipe hole 41 and the insertion port 105 are parallel. Therefore, the insertion port 105 of the sealing head 102 is not obliquely fitted into the screw hole portion 45 of the pipe hole 41 . At this time, since the distance from the anti-rotation hole 61 and the guide rod 123 to the piping hole 41 and the distance to the insertion opening 105 are the same, the displacement of the insertion opening 105 from the piping hole 41 is suppressed. be done.

At this time, due to variations in manufacturing precision of the caliper 11, the position of the piping hole 41 and the position of the insertion port 105 may slightly deviate in the circumferential direction with respect to the anti-rotation hole 61 and the guide rod 123. However, at that time, the insertion port 105 is guided by the chamfer 44 at the mouth of the piping hole 41, and the sealing head 102 rotates around the guide rod 123 while elastically deforming the plurality of O-rings 91. Then, the insertion port 105 enters into the screw hole portion 45 of the pipe hole 41 .

Finally, the seal ring 111 comes into contact with the chamfer 44 of the pipe hole 41 to cut off the communication of the gap between the pipe hole 41 and the sealing head 102 to the outside air. In this state, the liquid chamber 35 of the caliper 11 communicates only with the inside of the sealing head 102 .

In this state, the caliper inspection device 10 supplies compressed air, which is a fluid having a pressure different from the atmospheric pressure, from the sealing head 102 to the liquid chamber 35 . That is, this step is a step of supplying a fluid having a pressure different from the atmospheric pressure from the sealing head 102 by the caliper inspection device 10 . When the air pressure in the fluid chamber 35 and the sealing head 102 detected by a pressure sensor (not shown) reaches a predetermined value, the compressed air is released from the fluid chamber 35 and the sealing head 102 to prevent the brake pad 14 from dragging. Check for presence. That is, this step is a step of inspecting the performance of the caliper 11 by the caliper inspection device 10. FIG. The caliper inspection device 10 inspects the drag suppression performance of the caliper 11 by supplying the caliper 11 with a fluid having a pressure different from the atmospheric pressure from the sealing head 102 in this manner.

After that, the moving mechanism 82 separates the inspection head 81 from the caliper 11 , but at this time, the guide rod 123 remains fitted in the anti-rotation hole 61 by the biasing force of the buffer spring 134 of the buffer 122 . , while sliding the base cylinder 131 with respect to the slide pin 132, the enclosing head 102 moves along the guide rod 123, and the insertion port 105 comes out of the piping hole 41. As shown in FIG. Therefore, the insertion port 105 is pulled out without being oblique to the screw hole portion 45 of the pipe hole 41 . After that, when the guide rod 123 is pulled out of the anti-rotation hole 61, the plurality of O-rings 91 and the wave washer 151 return to their original states due to their elasticity, and the body portion 101 of the sealing head 102 is arranged coaxially with the support hole 86. .

The above inspection is automatically performed by the caliper inspection device 10 .

Patent Literature 1 describes a disc brake caliper having a pipe hole to which a pipe is connected and a detent hole for detenting the pipe. In the caliper, there are cases where the inspection is performed by enclosing the fluid from the pipe hole, and at that time, the inspection instrument may collide with the pipe hole and cause a dent. If dents are formed around the pipe hole, there is a possibility that the sealability of the pipe hole will become defective and the product will be defective.

On the other hand, in the caliper inspection device 10 of the present embodiment, the guide rod 123 is inserted into the detent hole 61, and in this state, the sealing head 102 is moved along the guide rod 123 and inserted into the piping hole 41. . Therefore, the enclosing head 102 can be inserted into the piping hole 41 in a state in which the enclosing head 102 is positioned to some extent by inserting the guide rod 123 into the anti-rotation hole 61 . As a result, it is possible to reduce the possibility of causing dents on the seat surface 46 on which the seal ring 53 is to be placed later, the screw hole portion 45 and the like around the pipe hole 41 . Therefore, it is possible to reduce the possibility that the sealing performance of the pipe hole 41 will be defective and the product will be defective. Therefore, it is possible to reduce the product defect rate of the caliper 11, and as a result, it is possible to reduce the product cost.

In addition, since the enclosing head 102 can be inserted into the piping hole 41 in a state where the enclosing head 102 is positioned to some extent by inserting the guide rod 123 into the anti-rotation hole 61, the seal provided in the enclosing head 102 can be used. Damage to the ring 111 can also be suppressed. Therefore, the service life of the seal ring 111 can be extended, and the maintenance cost of the caliper inspection device 10 can be reduced.

The caliper inspection device 10 of the present embodiment can fully automatically inspect the caliper 11 set on a set table (not shown), so that it is possible to save manpower and prevent forgetting to inspect. be able to.

Here, when the guide rod 123 is first inserted into the anti-rotation hole 61, there is a possibility that the periphery of the anti-rotation hole 61 is dented, but the buffer spring 134 of the buffer 122 absorbs the impact at the time of collision. Also, since the chamfer 62 of the anti-rotation hole 61 and the chamfer 142 of the guide rod 123 come into contact with each other to soften the impact, dents are less likely to occur. Even if a dent occurs, the detent hole 61 is a portion that does not cause a sealing problem, so the product defect rate of the caliper 11 does not increase.

In the above embodiment, the caliper inspection device 10 for inspecting the drag of the brake pad 14 is taken as an example of inspection including the step of supplying fluid having a pressure different from the atmospheric pressure to the fluid chamber 35 from the sealing head 102 . However, if the inspection apparatus performs an inspection including a step of supplying a fluid having a pressure different from the atmospheric pressure from the encapsulating head 102 to the liquid chamber 35, the inspection apparatus having the above configuration can also be used for an inspection different from the above. An inspection head 81 and a moving mechanism 82 can be applied. For example, when a fluid having a pressure different from the atmospheric pressure is supplied from the sealing head 102 into the liquid chamber 35 and the pressure of the liquid chamber 35 is lowered when the liquid chamber 35 is sealed, sealing leakage of the liquid chamber 35 is detected. It can also be applied to a caliper inspection device that

A first aspect of the above embodiment is a caliper inspection device for inspecting a caliper having a pipe hole to which a pipe is connected and a rotation stop hole for preventing rotation of the pipe, wherein a guide rod and the guide rod is inserted into the anti-rotation hole, the encapsulation head moves along the guide rod and is inserted into the pipe hole, and the encapsulation head is moved to atmospheric pressure. The caliper is tested by supplying fluid at a pressure different from

A second aspect is a caliper inspection method for inspecting a caliper having a pipe hole to which a pipe is connected and a rotation stop hole for preventing rotation of the pipe by a caliper inspection device having a guide rod and an enclosing head. a step of inserting the guide rod into the anti-rotation hole; a step of moving the enclosing head along the guide rod and inserting the enclosing head into the pipe hole; and supplying a fluid.

REFERENCE SIGNS LIST 10 caliper inspection device 11 caliper 41 piping hole 51 piping 61 anti-rotation hole 102 sealing head 123 guide rod

Claims (3)

A caliper inspection device for inspecting a caliper having a pipe hole to which a pipe is connected and a detent hole for detenting the pipe,
base cylinder and
a slide pin housed in the base cylinder and extending from the base cylinder;
a base portion connected to the tip of the slide pin;
a buffer spring that is provided between the base cylinder and the base portion and accommodates the slide pin therein;
a guide rod connected to the buffer spring through the base;
an encapsulation head movably disposed relative to the guide rod;
the guide rod is inserted into the anti-rotation hole,
the enclosing head is moved along the guide rod and inserted into the piping hole;
inspecting the caliper by supplying fluid from the encapsulation head at a pressure different from atmospheric pressure;
Caliper inspection device. base cylinder and
a slide pin housed in the base cylinder and extending from the base cylinder;
a base portion connected to the tip of the slide pin;
a buffer spring that is provided between the base cylinder and the base portion and accommodates the slide pin therein;
a guide rod connected to the buffer spring through the base;
A caliper inspection for inspecting a caliper having a pipe hole to which a pipe is connected and a rotation stop hole for preventing rotation of the pipe by a caliper inspection device comprising a sealing head movably arranged with respect to the guide rod. a method,
inserting the guide rod into the anti-rotation hole;
moving the encapsulation head along the guide rod and inserting it into the pipe hole;
and C. supplying a fluid at a pressure different from atmospheric pressure from the enclosing head. The step of supplying a fluid at a pressure different from atmospheric pressure from the encapsulation head comprises:
a compressed air supply step of supplying compressed air, which is a fluid having a pressure different from atmospheric pressure, from the enclosing head to a liquid chamber provided in the caliper;
a brake pad drag determination step of removing compressed air from the fluid chamber when the air pressure in the fluid chamber and the sealed head reaches a predetermined value, and inspecting the presence or absence of brake pad dragging;
3. The caliper inspection method according to claim 2, comprising:

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