Brake disc inspection tool and inspection method

Abstract

The present invention relates to the field of brake disc surface profile detection, and specifically discloses a brake disc inspection tool and an inspection method, including a inspection tool body, wherein the inspection tool body includes a gripping portion and an inserting portion, and a plurality of hole position groove wall detection components are distributed in a cavity area of ​​the inserting portion along a dispersion curve, the hole position groove wall detection component includes two semicircular indicators that can be spliced ​​into a circle, the outer arc surface of the semicircular indicator is fixedly connected to a contact ball rod, a rib spacing and height detection component, and the rib spacing and height detection component includes a fitting surrounding portion, a rib outer curved surface fitting portion, and a rib inner curved surface fitting portion; the brake disc arc air duct inspection tool provided by the present technical solution has a simple structure. When the inserting portion is inserted into the air duct, with the heat dissipation hole as the observation center, the spacing between the heat dissipation hole and the heat dissipation rib plate and the distribution of the heat dissipation hole along the dispersion curve can be respectively obtained, the fitting surrounding portion is lifted axially along the semicircular indicator, and the air duct width is determined by the exposure of the first control surface.

Description

Technical Field

[0001] The present invention relates to the field of brake disc surface profile detection, and in particular to a brake disc detection tool and a detection method. Background Art

[0002] In order to ensure the heat dissipation effect, an air duct will be set up in the radial direction of the brake disc. The air duct is mainly formed by splicing two brake disc bodies and air duct ribs. Heat dissipation holes are opened on the surface of the brake disc, and the heat dissipation holes are located in the air duct. After the brake disc is processed, a dynamic balance test is required. The purpose of the dynamic balance test is to ensure the uniformity of the mass distribution of the brake disc. If the ribs of the brake disc are unevenly distributed and the heat dissipation holes are unevenly distributed, it will lead to too many adjustment parameters of the brake disc during the dynamic balancing process. The air duct of the brake disc is located inside, and the curved air duct cannot be directly observed through the circumferential surface of the brake disc. Therefore, it is impossible to identify the defects of the brake disc with the help of visual processing.

[0003] Therefore, a brake disc inspection fixture is designed to detect features such as the distribution profile of curved air ducts and heat dissipation holes, and to screen out brake discs with large specification deviations. This can improve the efficiency of subsequent dynamic balancing adjustments of the brake discs and avoid over-adjustment of the brake discs. Summary of the Invention

[0004] The purpose of the present invention is to provide a brake disc inspection fixture and inspection method, which uses the cooperation of a semicircular indicator and a heat dissipation hole to obtain multiple parameters such as the hole position, the distance between the hole and the rib wall, the distance between the two ribs, and the air duct width, so as to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A brake disc inspection tool, comprising:

[0007] A checking tool body, comprising a gripping portion and an inserting portion;

[0008] A hole position and groove wall detection assembly, wherein a plurality of the hole position and groove wall detection assemblies are distributed along a dispersion curve in the cavity area of ​​the insertion portion, the hole position and groove wall detection assembly comprising two semicircular indicators that can be spliced ​​into a circle, the outer arc surface of the semicircular indicator being fixedly connected to a contact ball rod, the contact ball rod being slidably connected to the insertion portion, and the insertion portion and the semicircular indicator being elastically connected via a tension spring;

[0009] The rib spacing and height detection component includes a fitting surrounding portion, a rib outer curved surface fitting portion, and a rib inner curved surface fitting portion. The curvature of the fitting surrounding portion fits the circumferential surface of the brake disc. The fitting surrounding portion is located between the holding portion and the insertion portion. The rib outer curved surface fitting portion and the rib inner curved surface fitting portion are respectively installed on the side of the fitting surrounding portion close to the brake disc.

[0010] As a further solution of the present invention: there is a distance between the insertion portion and the air duct rib plate.

[0011] As a further solution of the present invention: the outer diameter of the semicircular indicator is equal to the inner diameter of the brake disc heat dissipation hole, and the surface of the semicircular indicator is provided with a second control surface.

[0012] As a further solution of the present invention: the second control surface is composed of a plurality of concentric color bands of different diameters.

[0013] As a further solution of the present invention: the ends of the rib outer curved surface fitting portion and the rib inner curved surface fitting portion away from the fitting surrounding portion both have a bending portion, and the bending direction of the bending portion is the side away from the fitting surrounding portion.

[0014] As a further solution of the present invention: Teflon films are attached to opposite sides of the rib outer curved surface bonding portion and the rib inner curved surface bonding portion.

[0015] As a further solution of the present invention: the height of the fitting surrounding portion is equal to the thickness of the brake disc, and a first control surface is provided on a side of the fitting surrounding portion close to the brake disc.

[0016] As a further solution of the present invention, the thickness of the insert portion is equal to the standard width of the brake disc ventilation slot.

[0017] As a further solution of the present invention: a method for detecting a brake disc inspection fixture, comprising:

[0018] S1: Holding the gripping portion, insert the inserting portion into the brake disc heat dissipation channel, with a distance between the inserting portion and the air duct rib plate, so that the inserting portion can be inserted into the brake heat dissipation channel with minimal obstruction, and the inserting portion can be smoothly inserted into the heat dissipation channel, and the width of the heat dissipation channel is greater than or equal to the thickness of the inserting portion;

[0019] S2: The surrounding portion is in contact with the arc edge of the brake disc, and the gripping portion is shaken along the axial direction of the brake disc to observe the exposure status of the first control surface. If the first control surface is exposed, the width of the heat dissipation channel is greater than the thickness of the inserting portion, and the brake disc channel is unqualified. If the first control surface has no exposed color, the brake disc channel is qualified.

[0020] S3: The rib outer curved surface fitting portion and the rib inner curved surface fitting portion are respectively fitted to the outer and inner curved surfaces of the two air duct rib plates. The rib outer curved surface fitting portion and the rib inner curved surface fitting portion restrict the insertion portion to be in the center of the brake disc heat dissipation channel. The fitting surrounding portion restricts the insertion depth of the insertion portion into the brake disc heat dissipation channel. The fitting surrounding portion cannot contact the circumferential surface of the brake disc. The spacing between the two air duct rib plates is greater than the specified standard. When the fitting surrounding portion contacts the circumferential surface of the brake disc and cannot swing along the circumferential surface of the brake disc, the spacing between the two air duct rib plates meets the specified standard.

[0021] S4: The contact ball rod contacts the air duct ribs, and the tension spring is elastically deformed by the push of the contact ball rod. The two semicircular indicators move relative to each other. When the distance between the brake disc hole and the air duct ribs on both sides is qualified, the circular ring shape after the second control surface is spliced ​​is exposed through the brake disc heat dissipation hole. The distance between the brake disc hole and the air duct ribs on both sides is less than the standard distance. The semicircular indicator is relatively squeezed and deformed, or the fitting surrounding part cannot contact the arc edge of the brake disc. The distance between the brake disc hole and the air duct ribs on both sides is greater than the standard distance. The second control surface cannot form a closed loop, and the brake disc heat dissipation hole deviates from the dispersion curve. When observed through the brake disc heat dissipation hole, the center of the closed loop formed by the second control surface and the center of the heat dissipation hole are not on a vertical line.

[0022] This technical solution uses two duct ribs as position limits and the fitting surrounding part as depth limit, adopts an inserted part to enter the interior of the channel, utilizes the distribution characteristics of the heat dissipation holes along the dispersion curve, and uses the dispersion curve as the basis to cooperate with the semicircular indicator and the heat dissipation hole to obtain multiple parameters such as the hole position, the distance between the hole and the rib wall, the distance between the two ribs, and the duct width.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] Ⅰ: The brake disc arc duct inspection fixture provided by this technical solution has a simple structure. When the inserting part is inserted into the air duct, with the heat dissipation hole as the observation center, the distance between the heat dissipation hole and the heat dissipation rib plate and the distribution calibration results of the heat dissipation hole along the dispersion curve can be respectively obtained.

[0025] Ⅱ: The outer curved surface fitting part of the rib and the inner curved surface fitting part of the rib realize the spacing detection of the air duct rib plate and the positioning of the inserted part, solve the problem of difficulty in entering the inserted part and improve the detection accuracy of advantage Ⅰ.

[0026] III: The insertion part enters the air duct, and the surrounding part is lifted along the axial direction of the semicircular indicator. The exposure of the first reference surface determines the width of the air duct. The insertion part is positioned to limit the insertion depth of the insertion part and improve the detection accuracy of advantage I. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 This is a top view schematic diagram of a brake disc inspection fixture in use;

[0029] Figure 2This is a three-dimensional schematic diagram of a brake disc inspection fixture in use;

[0030] Figure 3 This is a cross-sectional perspective diagram of a brake disc inspection fixture in use;

[0031] Figure 4 for Figure 3 Schematic top view of

[0032] Figure 5 The figure is a three-dimensional schematic diagram of a brake disc inspection fixture;

[0033] In the figure: 100, dispersion curve; 1, gripping portion; 2, fitting surrounding portion; 21, first control surface; 3, rib outer curved surface fitting portion; 4, rib inner curved surface fitting portion; 5, insertion portion; 6, semicircular indicator; 61, second control surface; 7, tension spring; 8, contact ball rod. DETAILED DESCRIPTION

[0034] See also Figure 1-Figure 5 In this embodiment, the device includes a checking tool body, which includes a gripping portion 1 and an inserting portion 5 .

[0035] In this embodiment, the gripping portion 1 and the inserting portion 5 can be integrally formed or fixed by screws or other fixing methods. The gripping portion 1 provides a gripping area for the operator, and the operator inserts the inserting portion 5 into the air duct by gripping the gripping portion 1.

[0036] In this embodiment: a hole position and groove wall detection component, a plurality of hole position and groove wall detection components are distributed in the cavity area of ​​the insertion part 5 along the dispersion curve 100, and the hole position and groove wall detection component includes two semicircular indicators 6 that can be spliced ​​into a circle. The outer arc surface of the semicircular indicator 6 is fixedly connected to a contact ball rod 8, and the contact ball rod 8 is slidably connected to the insertion part 5. The insertion part 5 and the semicircular indicator 6 are elastically connected by a tension spring 7.

[0037] In this embodiment: Please refer to Figure 4 The insert 5 is inserted into the duct, with a gap between it and the duct rib. The contact ball rod 8 contacts the arc surface of the duct rib, and the insert 5 enters the designated position in the duct. The tension spring 7 applies tension to the semicircular indicator 6, ensuring that the contact ball rod 8 remains in contact with the duct rib. If the heat dissipation hole is positioned as desired and the gap between the heat dissipation hole and the duct rib is as desired, the displacement of the two contact ball rods 8 facilitates the splicing of the semicircular indicator 6, placing the spliced ​​semicircular indicator 6 below the heat dissipation hole. The operator can simply observe the exposure of the semicircular indicator 6 through the heat dissipation hole.

[0038] In this embodiment, if the semicircular indicator 6 is made of elastic plastic, when the distance between the hole and the duct rib is narrower than the specified distance, the two contact ball rods 8 squeeze the semicircular indicator 6, causing it to elastically deform, transforming its circular shape into an elliptical shape. When viewing the semicircular indicator 6 through the heat dissipation hole, four centrally symmetrically distributed hollow areas are formed between the semicircular indicator 6 and the heat dissipation hole, and the major axis end of the elliptical semicircular indicator 6 is hidden.

[0039] In this embodiment, if the semicircular indicator 6 is made of a hard material, when the distance between the hole and the air duct rib is narrower than the specified distance, the inserted portion 5 cannot penetrate further into the air duct, and the fitting surrounding portion 2 cannot contact the brake disc.

[0040] In this embodiment, when the heat dissipation hole deviates from the dispersion curve 100 , the circular structure formed by the semicircular indicator 6 cannot be completely displayed in the heat dissipation hole.

[0041] In this embodiment, when the distance between the hole and the air duct rib is greater than the specified distance, the tension spring 7 pulls the contact ball rod 8 to fit the air duct rib, and the semicircular indicator 6 cannot form a closed loop.

[0042] In this embodiment: the rib spacing and height detection component, the rib spacing and height detection component includes a fitting surrounding portion 2, a rib outer curved surface fitting portion 3, and a rib inner curved surface fitting portion 4. The curvature of the fitting surrounding portion 2 fits with the circumferential surface of the brake disc. The fitting surrounding portion 2 is located between the gripping portion 1 and the insertion portion 5. The rib outer curved surface fitting portion 3 and the rib inner curved surface fitting portion 4 are respectively installed on the side of the fitting surrounding portion 2 close to the brake disc.

[0043] In this embodiment, the purpose of the rib spacing and height detection component is to limit the position of the hole slot wall detection component to ensure that the semicircular indicator 6 is aligned with the heat dissipation hole. Figure 3 The insert 5 is inserted into the air duct, and the conforming enclosing portion 2 contacts the circumference of the brake disc, with the curvature of the conforming enclosing portion 2 matching that of the brake disc. After the conforming enclosing portion 2 contacts the brake disc, the insert 5 cannot penetrate any further. A gap exists between the insert 5 and the air duct ribs, so the conforming enclosing portion 2 will still wobble along the curvature of the brake disc. Therefore, the outer curved surface conforming portion 3 and the inner curved surface conforming portion 4 are provided.

[0044] In this embodiment: Please refer to Figure 4, the rib outer curved surface fitting part 3 and the rib inner curved surface fitting part 4 are in contact with the outer side and inner side of the two air duct ribs respectively. Under the limitation of the rib outer curved surface fitting part 3 and the rib inner curved surface fitting part 4, the fitting surrounding part 2 cannot shake along the arc surface of the brake disc. And the rib outer curved surface fitting part 3 and the rib inner curved surface fitting part 4 can also detect whether the spacing between two adjacent air duct ribs meets the requirements. When the width of two adjacent air duct ribs is greater than the specified width, the rib outer curved surface fitting part 3 and the rib inner curved surface fitting part 4 cannot be limited. When the width of two adjacent air duct ribs is narrower than the fixed width, after the rib outer curved surface fitting part 3 and the rib inner curved surface fitting part 4 are limited, the fitting surrounding part 2 can shake along the circumferential direction of the brake disc, so as to determine whether it is qualified.

[0045] In this embodiment: there is a distance between the inserting portion 5 and the air duct rib plate, see Figure 4 , the shape of the air duct is curved, if the insertion part 5 matches the shape of the air duct. During manual operation, the operator needs to control the insertion part 5 to bend into the air duct. The inner wall of the air duct is basically not processed by the polishing process, which leads to the rough surface of the air duct rib plate. The insertion part 5 has a large resistance when turning into the air duct, and the insertion part 5 must be controlled to enter the air duct along the air duct trajectory, which makes it difficult for the insertion part 5 to enter and increases the operator's operating burden. Therefore, there is a distance between the insertion part 5 and the air duct rib plate, and the trajectory of the insertion part 5 entering the air duct is more diverse, which increases the convenience of operation. The outer end of the air duct rib plate is limited by the outer curved surface fitting part 3 of the rib, the inner curved surface fitting part 4 of the rib and the insertion part 5. It can not only detect whether the spacing of the air duct rib plates is qualified, but also achieve the position fixation of the insertion part 5.

[0046] In this embodiment, the outer diameter of the semicircular indicator 6 is equal to the inner diameter of the brake disc heat dissipation hole. The surface of the semicircular indicator 6 is provided with a second contrast surface 61, which is composed of a plurality of concentric color bands of different diameters. Figure 5 The second control surface 61 is a plurality of concentric color bands of different diameters that can detect the diameter of the heat dissipation hole. When the diameter of the heat dissipation hole is reduced, the color of the second control surface 61 exposed in the heat dissipation hole will change.

[0047] In this embodiment, the ends of the rib outer curved surface fitting portion 3 and the rib inner curved surface fitting portion 4 away from the fitting surrounding portion 2 each have a curved portion, with the curved portion bending in a direction away from the fitting surrounding portion 2. The curved portion can guide the rib outer curved surface fitting portion 3 and the rib inner curved surface fitting portion 4 as they enter the air duct rib plate, allowing the operator to more quickly and accurately achieve the purpose of aligning the rib outer curved surface fitting portion 3 and the rib inner curved surface fitting portion 4 with the air duct rib plate.

[0048] In this embodiment, Teflon films are attached to the opposite sides of the rib outer curved surface bonding portion 3 and the rib inner curved surface bonding portion 4.

[0049] The outer and inner curved surfaces of the ribs (3 and 4) need to contact the duct ribs. Adding Teflon film reduces sliding friction between these two surfaces. This reduces the contact area between these two surfaces, minimizing the economic losses caused by wear of the Teflon film.

[0050] In this embodiment, the height of the fitting surrounding portion 2 is equal to the thickness of the brake disc. A first contact surface 21 is provided on the side of the fitting surrounding portion 2 close to the brake disc. The thickness of the inserting portion 5 is equal to the standard width of the brake disc ventilation slot. The inserting portion 5 is a hollow structure. The contact area between the upper and lower end surfaces of the inserting portion 5 and the brake disc surface is reduced to improve the smoothness of insertion. Figure 5 The thickness of the inserting portion 5 is the thickness along the axial direction of the semicircular indicator 6. The thickness of the inserting portion 5 is the standard width of the air duct. The inserting portion 5 cannot enter the air duct, and the actual width of the air duct is lower than the standard width of the air duct. When the inserting portion 5 enters the air duct, the fitting surrounding portion 2 is lifted along the axial direction of the semicircular indicator 6, and the first control surface 21 is exposed. The actual width of the air duct is higher than the standard width of the air duct. For specific performance, please refer to Figure 2 .

[0051] The specific method of this embodiment is as follows:

[0052] S1: Hold the grip 1 and insert the insert 5 into the brake disc heat dissipation channel. There is a gap between the insert 5 and the air duct ribs. The insert 5 can be inserted into the brake heat dissipation channel with minimal obstruction. The insert 5 can be smoothly inserted into the heat dissipation channel. The width of the heat dissipation channel is greater than or equal to the thickness of the insert 5.

[0053] S2: Fit the surrounding portion 2 to the arc edge of the brake disc, hold the gripping portion 1 and shake it along the axial direction of the brake disc to observe the exposure status of the first control surface 21. If the first control surface 21 is exposed and the width of the heat dissipation channel is greater than the thickness of the inserting portion 5, the brake disc channel is unqualified. If the first control surface 21 has no exposed color, the brake disc channel is qualified.

[0054] S3: The rib outer curved surface fitting portion 3 and the rib inner curved surface fitting portion 4 are respectively fitted on the outer and inner curved surfaces of the two air duct rib plates. The rib outer curved surface fitting portion 3 and the rib inner curved surface fitting portion 4 limit the insertion portion 5 to the center of the brake disc heat dissipation channel. The fitting surrounding portion 2 limits the depth of the insertion portion 5 inserted into the brake disc heat dissipation channel. The fitting surrounding portion 2 cannot contact the circumferential surface of the brake disc. The distance between the two air duct rib plates is greater than the specified standard. When the fitting surrounding portion 2 contacts the circumferential surface of the brake disc and cannot swing along the circumferential surface of the brake disc, the distance between the two air duct rib plates meets the specified standard.

[0055] S4: The contact ball rod 8 contacts the air duct ribs, and the tension spring 7 is elastically deformed by the push of the contact ball rod 8. The two semicircular indicators 6 move relative to each other. When the distance between the brake disc hole and the air duct ribs on both sides is qualified, the circular ring shape of the second control surface 61 is exposed through the brake disc heat dissipation hole. The distance between the brake disc hole and the air duct ribs on both sides is less than the standard distance. The semicircular indicator 6 is relatively squeezed and deformed, or the fitting surrounding part 2 cannot contact the arc edge of the brake disc. The distance between the brake disc hole and the air duct ribs on both sides is greater than the standard distance. The second control surface 61 cannot form a closed loop. The brake disc heat dissipation hole deviates from the dispersion curve 100. When observed through the brake disc heat dissipation hole, the center of the closed loop formed by the second control surface 61 and the center of the heat dissipation hole are not on a vertical line.

[0056] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A brake disc inspection tool, characterized by: include: A checking tool body, the checking tool body comprising a gripping portion (1) and an inserting portion (5); A hole position slot wall detection assembly, wherein a plurality of the hole position slot wall detection assemblies are distributed in the cavity area of ​​the insertion portion (5) along a dispersion curve (100), the hole position slot wall detection assembly comprises two semicircular indicators (6) that can be spliced ​​into a circle, the outer arc surface of the semicircular indicator (6) is fixedly connected to a contact ball rod (8), the contact ball rod (8) is slidably connected to the insertion portion (5), and the insertion portion (5) and the semicircular indicator (6) are elastically connected via a tension spring (7); A rib spacing and height detection component, the rib spacing and height detection component comprises a fitting surrounding portion (2), a rib outer curved surface fitting portion (3), and a rib inner curved surface fitting portion (4), the curvature of the fitting surrounding portion (2) fits the circumferential surface of the brake disc, the fitting surrounding portion (2) is located between the holding portion (1) and the inserting portion (5), and the rib outer curved surface fitting portion (3) and the rib inner curved surface fitting portion (4) are respectively installed on a side of the fitting surrounding portion (2) close to the brake disc.

2. A brake disc inspection tool according to claim 1, characterized in that: The insertion portion (5) is spaced apart from the air duct rib.

3. The brake disc inspection tool according to claim 1, characterized in that: The outer diameter of the semicircular indicator (6) is equal to the inner diameter of the brake disc heat dissipation hole, and a second contrast surface (61) is provided on the surface of the semicircular indicator (6).

4. A brake disc inspection tool according to claim 3, characterized in that: The second contrast surface (61) is composed of a plurality of concentric color bands of different diameters.

5. The brake disc inspection tool according to claim 1, characterized in that: The ends of the rib outer curved surface fitting portion (3) and the rib inner curved surface fitting portion (4) away from the fitting surrounding portion (2) both have a bending portion, and the bending direction of the bending portion is the side away from the fitting surrounding portion (2).

6. The brake disc inspection tool according to claim 1, characterized in that: Teflon films are attached to the opposite sides of the rib outer curved surface bonding portion (3) and the rib inner curved surface bonding portion (4).

7. The brake disc inspection tool according to claim 1, characterized in that: The height of the fitting surrounding portion (2) is equal to the thickness of the brake disc, and a first contrast surface (21) is provided on a side of the fitting surrounding portion (2) close to the brake disc.

8. The brake disc inspection tool according to claim 1, characterized in that: The thickness of the insert (5) is equal to the standard width of the brake disc ventilation slot.

9. A method for detecting a brake disc inspection fixture according to any one of claims 1 to 8, characterized in that: S1: Holding the holding portion (1), inserting the inserting portion (5) into the heat dissipation channel of the brake disc, the inserting portion (5) and the air duct rib plate are spaced apart, the inserting portion (5) is inserted into the heat dissipation channel with little obstruction, the inserting portion (5) can be smoothly inserted into the heat dissipation channel, and the width of the heat dissipation channel is greater than or equal to the thickness of the inserting portion (5); S2: The fitting surrounding portion (2) contacts the arc edge of the brake disc, and the gripping portion (1) is shaken along the axial direction of the brake disc to observe the exposure state of the first control surface (21). If the first control surface (21) is exposed, the width of the heat dissipation channel is greater than the thickness of the inserting portion (5), and the brake disc channel is unqualified. If the first control surface (21) has no exposed color, the brake disc channel is qualified. S3: The outer curved surface fitting portion (3) and the inner curved surface fitting portion (4) are respectively fitted on the outer curved surface and the inner curved surface of the two air duct ribs, the outer curved surface fitting portion (3) and the inner curved surface fitting portion (4) limit the insertion portion (5) to be in the center of the brake disc heat dissipation channel, the fitting surrounding portion (2) limits the depth of the insertion portion (5) inserted into the brake disc heat dissipation channel, the fitting surrounding portion (2) cannot contact the circumferential surface of the brake disc, the distance between the two air duct ribs is greater than the specified standard, and when the fitting surrounding portion (2) contacts the circumferential surface of the brake disc and cannot swing along the circumferential surface of the brake disc, the distance between the two air duct ribs meets the specified standard; S4: The contact ball rod (8) contacts the air duct ribs, and the tension spring (7) is elastically deformed by the push of the contact ball rod (8). The two semicircular indicators (6) move relative to each other. When the distance between the brake disc hole and the air duct ribs on both sides is qualified, the circular ring after the second control surface (61) is spliced ​​is exposed through the brake disc heat dissipation hole. The distance between the brake disc hole and the air duct ribs on both sides is less than the standard distance. The semicircular indicator (6) is relatively squeezed and deformed or causes the fitting surrounding part (2) to be unable to contact the arc edge of the brake disc. The distance between the brake disc hole and the air duct ribs on both sides is greater than the standard distance. The second control surface (61) cannot form a closed loop. The brake disc heat dissipation hole deviates from the dispersion curve (100). When observing through the brake disc heat dissipation hole, the center of the closed loop formed by the second control surface (61) and the center of the heat dissipation hole are not located on a vertical line.

Images