A brake drum inner brake surface runout detection device

Abstract

The utility model relates to a kind of brake drum inner brake face runout detection devices, including positioning pin, transmission sleeve, transmission rod, measurement contact, micrometer and table head contact, the transmission rod includes vertically arranged vertical force arm and transverse force arm, the end of the vertical force arm is equipped with the measurement contact, the measurement contact is horizontally arranged, the end of the transverse force arm is equipped with the table head contact, the middle part of the transmission rod is rotatably mounted on the transmission sleeve by the positioning pin, the micrometer is vertically installed on the transmission sleeve, the table head contact is contacted with the measuring rod of the micrometer. The combination design of transmission rod, measurement contact, micrometer and table head contact, the accurate detection of brake drum inner brake runout is realized. The detection device is simple in structure, easy to debug, widely applicable, high in measurement efficiency, improves online measurement efficiency, thereby improves product factory pass rate, saves measurement cost.

Description

Technical Field

[0001] This utility model relates to the field of testing equipment technology, specifically to a device for detecting the runout of the inner brake surface of a brake drum. Background Technology

[0002] In the current automotive manufacturing industry, brake drums, as a key component of the braking system, are crucial for ensuring driving safety through the detection of runout on their inner brake surfaces. Existing testing methods largely rely on specialized measuring instruments. While these instruments provide relatively accurate results, their high cost limits their widespread application on production lines. Because each measuring instrument requires a significant initial investment, companies often cannot equip every testing station with such equipment, resulting in insufficient testing frequency. The lack of online testing means that only some products undergo precise runout testing, while others may have potential quality issues due to the lack of inspection. Furthermore, the debugging and maintenance of specialized measuring instruments are relatively complex, requiring specialized technicians, further increasing labor and time costs. Utility Model Content

[0003] This invention addresses the existing technical problems by providing a device for detecting the runout of the inner brake surface of a brake drum.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A brake drum inner brake surface runout detection device includes a positioning pin, a transmission sleeve, a transmission rod, a measuring contact, a dial indicator, and a dial indicator head contact. The transmission rod includes a vertically arranged vertical arm and a horizontal arm. The measuring contact is installed at the end of the vertical arm and is horizontally arranged. The dial indicator head contact is installed at the end of the horizontal arm. The middle part of the transmission rod is rotatably mounted on the transmission sleeve through the positioning pin. The dial indicator is vertically mounted on the transmission sleeve, and the dial indicator head contact is in contact with the measuring rod of the dial indicator.

[0005] Based on the above technical solution, the present invention can be further improved as follows:

[0006] Preferably, the contact of the measuring contact is spherical and rotatable.

[0007] Preferably, one end of the transmission rod is provided with a mounting hole one, on which the measuring contact is installed, and the other end of the transmission rod is provided with a mounting hole two, on which the meter contact is installed.

[0008] Preferably, the transmission rod has a second pin hole in the middle, the distance between the first mounting hole and the second pin hole is L1, and the distance between the second mounting hole and the second pin hole is L2, where L1=L2.

[0009] Preferably, the transmission rod has a positioning platform in the middle, the second pin hole is set on the positioning platform, and the transmission sleeve has a corresponding positioning groove.

[0010] Preferably, it further includes a base, a support rod, and a lifting plate. The support rod is fixed to the base by fasteners, the lifting plate is mounted on the support rod, and the transmission sleeve is mounted on the lifting plate.

[0011] Preferably, the support rod is provided with a vertically arranged adjustment groove, and the lifting plate is installed on the adjustment groove by fasteners.

[0012] Preferably, the transmission sleeve includes a horizontal sleeve and a vertical sleeve arranged vertically, the measuring rod is located inside the vertical sleeve, the meter head contact is located inside the horizontal sleeve, and the lower end of the transmission sleeve has an opening.

[0013] Preferably, the transmission sleeve is mounted on the lifting support plate via a fixing plate.

[0014] Preferably, the measuring contact is located on the side close to the dial indicator.

[0015] The beneficial effects of this invention are as follows: Through the combined design of the transmission rod, measuring contacts, dial indicator, and meter head contacts, accurate detection of brake drum internal brake runout is achieved. Simultaneously, by setting up a support rod and lifting plate, the height of the detection device can be adjusted according to actual needs to meet the measurement requirements of internal brake surface runout at different depths, further improving the flexibility and accuracy of the detection. The measuring contacts adopt a spherical design, which reduces friction with the brake drum internal surface, extends service life, and ensures measurement stability. This detection device has a simple structure, is easy to debug, has a wide range of applications, and high measurement efficiency. It can be widely used for online measurement of products with various apertures, improving online measurement efficiency, thereby increasing the product qualification rate and saving measurement costs. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of the detection device of this utility model;

[0017] Figure 2 This is a front view of the detection device of this utility model;

[0018] Figure 3 This is a cross-sectional schematic diagram of the transmission sleeve of this utility model;

[0019] Figure 4 This is the front view of the transmission rod of this utility model;

[0020] Figure 5 This is a side view of the transmission rod of this utility model;

[0021] Figure 6 This is a schematic diagram of the present invention in use.

[0022] The attached diagram is labeled as follows: 1. Base; 2. Support rod; 21. Adjustment groove; 3. Fastener; 4. Lifting support plate; 5. Positioning pin; 6. Transmission sleeve; 61. Pin hole one; 62. Step hole; 63. Positioning groove; 7. Transmission rod; 71. Mounting hole one; 72. Mounting hole two; 73. Pin hole two; 74. Positioning platform; 8. Measuring contact; 9. Fixing plate; 10. Dial indicator; 11. Locking screw; 12. Indicator head contact; 13. Measuring rod; 14. Workpiece to be measured. Detailed Implementation

[0023] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0024] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. The terms "vertical," "upper," "lower," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0025] like Figures 1 to 6 As shown, this utility model discloses a brake drum inner brake surface runout detection device, including a positioning pin 5, a transmission sleeve 6, a transmission rod 7, a measuring contact 8, a dial indicator 10, and a meter head contact 12. The transmission rod 7 includes a vertically arranged vertical arm and a horizontal arm. The measuring contact 8 is installed at the end of the vertical arm and is horizontally arranged. The meter head contact 12 is installed at the end of the horizontal arm. The middle part of the transmission rod 7 is rotatably mounted on the transmission sleeve 6 through the positioning pin 5. Specifically, the transmission sleeve 6 has a first pin hole 61, and the middle part of the transmission rod 7 has a second pin hole 73. The positioning pin 5 is inserted into the first pin hole 61 and the second pin hole 73. The dial indicator 10 is vertically mounted on the transmission sleeve 6, and the meter head contact 12 is in contact with the measuring rod 13 of the dial indicator 10.

[0026] In this embodiment, the measuring contact 8 is located on the side close to the dial indicator 10. The contact of the measuring contact 8 is spherical and rotatable, which can effectively reduce the friction between the measuring contact 8 and the inner wall of the workpiece 14 to be measured during measurement, reduce the wear of the measuring contact 8, make the detection more accurate, and improve the service life of the gauge.

[0027] In other alternative embodiments, the measuring contact 8 can also be installed on the side away from the dial indicator 10 to detect the runout of the outer wall of the workpiece 14 under test, thereby improving the applicability.

[0028] In this embodiment, the workpiece 14 to be tested is a brake drum. During testing, the vertical lever arm of the transmission rod 7 is inserted into the inner cavity of the workpiece 14 to be tested, and the measuring contact 8 is pressed on the inner wall of the workpiece 14 to be tested. When the workpiece 14 to be tested is rotated, the measuring contact 8 transmits the shape change of the inner wall of the workpiece 14 to the transmission rod 7, which in turn causes the horizontal lever arm to swing, thereby converting the radial change of the workpiece 14 to the axial change. Since the meter head contact 12 is in contact with the measuring rod 13 of the dial indicator 10, the measuring rod 13 transmits the change of the meter head contact 12 to the dial indicator 10. The needle of the dial indicator 10 jumps with the swing of the meter head contact 12, and the value of the needle jump is the amount of jump of the inner wall of the workpiece 14 to be tested. The structure is simple and the measurement is accurate.

[0029] The transmission sleeve 6 includes a horizontal sleeve and a vertical sleeve arranged vertically. The measuring rod 13 is located inside the vertical sleeve, and the meter contact 12 is located inside the horizontal sleeve. The lower end of the transmission sleeve 6 has an opening. Since the meter contact 12 and the measuring rod 13 are located inside the transmission sleeve 6, the measurement accuracy is avoided due to foreign objects falling on the meter contact 12. Furthermore, the lower end of the transmission sleeve 6 has an opening to increase the swing range of the meter contact 12 and improve the fluctuation measurement range.

[0030] The dial indicator 10 is installed on the stepped hole 62 of the vertical sleeve. A locking screw 11 is installed on the side wall of the stepped hole 62. The locking screw 11 is used to lock the dial indicator 10 to ensure the firmness of the installation of the dial indicator 10.

[0031] In this embodiment, the transmission sleeve 6 is mounted on the lifting support plate 4 via a fixing plate 9. The fixing plate 9 is bent to have a receiving groove. The fixing plate 9 presses against the transmission sleeve 6 through the receiving groove and is fixed to the lifting support plate 4 by fasteners such as screws or bolts, ensuring the firmness of the installation of the transmission sleeve 6 and ensuring the accuracy of the measurement results.

[0032] Specifically, one end of the transmission rod 7 is provided with a mounting hole 71, on which a measuring contact 8 is installed, and the other end is provided with a mounting hole 72, on which a meter contact 12 is installed, which facilitates the disassembly and replacement of the measuring contact 8 and the meter contact 12, thereby improving the convenience of operation.

[0033] Furthermore, the distance between mounting hole 71 and pin hole 73 is L1, and the distance between mounting hole 72 and pin hole 73 is L2, where L1 = L2. This ensures that the radial force is converted into axial force proportionally, making the test results more intuitive and accurate.

[0034] In this embodiment, specifically, a positioning platform 74 is provided in the middle of the transmission rod 7, and a pin hole 73 is provided on the positioning platform 74. The transmission sleeve 6 is provided with a corresponding positioning groove 63, which is a U-shaped groove with an opening on one side. The positioning platform 74 is installed in the positioning groove 63. This improves the assembly accuracy of the transmission sleeve 6 and the transmission rod 7, and ensures the accuracy of the transmission rod 7 in transmitting the shape changes of the workpiece 14 under test during operation.

[0035] The brake drum inner brake surface runout detection device also includes a base 1, a support rod 2, and a lifting plate 4. The support rod 2 is fixed to the base 1 by fasteners 3, the lifting plate 4 is mounted on the support rod 2, and the transmission sleeve 6 is mounted on the lifting plate 4. This facilitates the movement of the detection device, improves ease of use, and meets the needs of different scenarios.

[0036] Furthermore, the support rod 2 is provided with a vertically arranged adjustment groove 21, which extends along the length of the support rod 2. The lifting plate 4 is installed on the adjustment groove 21 by fasteners. The height of the lifting plate 4 can be adjusted according to actual measurement needs, thereby adjusting the height of the measuring contact 8 to accommodate brake drums of different depths, increasing the applicability and flexibility of the device, and ensuring detection accuracy.

[0037] In summary, this invention utilizes the lever principle to transmit radial shape changes of the workpiece 14 measured by the measuring contact 8, which are then converted into axial runout via the transmission rod 7. This axial runout is then transmitted through the dial indicator contact 12, causing the measuring rod 13 to move and the pointer of the dial indicator 10 to swing. This allows for accurate reading of the runout value of the inner brake surface of the workpiece 14, achieving precise detection of the runout of the inner brake surface of the brake drum. The device boasts advantages such as simple structure, convenient debugging, wide applicability, and high measurement efficiency. This detection device can be widely applied to online measurement of various inner brake bore diameter products, significantly improving product qualification rates and reducing measurement costs.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for detecting brake drum inner brake surface runout, characterized in that, The device includes a positioning pin (5), a transmission sleeve (6), a transmission rod (7), a measuring contact (8), a dial indicator (10), and a meter head contact (12). The transmission rod (7) includes a vertically arranged vertical arm and a horizontal arm. The measuring contact (8) is installed at the end of the vertical arm. The measuring contact (8) is horizontally arranged. The meter head contact (12) is installed at the end of the horizontal arm. The middle part of the transmission rod (7) is rotatably mounted on the transmission sleeve (6) through the positioning pin (5). The dial indicator (10) is vertically mounted on the transmission sleeve (6). The meter head contact (12) is in contact with the measuring rod (13) of the dial indicator (10).

2. The brake drum inner brake surface runout detection device according to claim 1, characterized in that, The measuring contact (8) has a spherical shape and is rotatable.

3. The brake drum inner brake surface runout detection device according to claim 2, characterized in that, One end of the transmission rod (7) is provided with a mounting hole 1 (71), on which the measuring contact (8) is installed. The other end of the transmission rod (7) is provided with a mounting hole 2 (72), on which the meter contact (12) is installed.

4. The brake drum inner brake surface runout detection device according to claim 3, characterized in that, The transmission rod (7) has a pin hole 2 (73) in the middle. The distance between the mounting hole 1 (71) and the pin hole 2 (73) is L1, and the distance between the mounting hole 2 (72) and the pin hole 2 (73) is L2, where L1=L2.

5. The brake drum inner brake surface runout detection device according to claim 4, characterized in that, The transmission rod (7) is provided with a positioning platform (74) in the middle, the pin hole (73) is provided on the positioning platform (74), and the transmission sleeve (6) is provided with a corresponding positioning groove (63).

6. The brake drum inner brake surface runout detection device according to claim 1, characterized in that, It also includes a base (1), a support rod (2) and a lifting plate (4). The support rod (2) is fixed on the base (1) by fasteners (3). The lifting plate (4) is installed on the support rod (2). The transmission sleeve (6) is installed on the lifting plate (4).

7. The brake drum inner brake surface runout detection device according to claim 6, characterized in that, The support rod (2) is provided with a vertically arranged adjustment groove (21), and the lifting plate (4) is installed on the adjustment groove (21) by fasteners.

8. The brake drum inner brake surface runout detection device according to claim 6, characterized in that, The transmission sleeve (6) includes a horizontal sleeve and a vertical sleeve arranged vertically. The measuring rod (13) is located inside the vertical sleeve, and the meter head contact (12) is located inside the horizontal sleeve. The lower end of the transmission sleeve (6) is provided with an opening.

9. The brake drum inner brake surface runout detection device according to claim 8, characterized in that, The transmission sleeve (6) is mounted on the lifting support plate (4) via a fixing plate (9).

10. The brake drum inner brake surface runout detection device according to claim 1, characterized in that, The measuring contact (8) is located on the side close to the dial indicator (10).

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