A non-motor vehicle brake shell size detection device

Abstract

This invention discloses a non-motorized vehicle brake housing size detection device, relating to the field of brake manufacturing technology. This detection device achieves precise detection of stepped boss dimensions through an elastic floating differential measurement structure, avoiding damage to the workpiece from rigid contact. The asymmetric staggered groove design adapts to the radial difference of the stepped boss, achieving 360° full circumferential size coverage in conjunction with a rotating tray. The isosceles trapezoidal layout calculation algorithm eliminates the need for a preset center, directly calculating the diameter through displacement difference, significantly improving the detection compatibility of eccentric workpieces and enabling the detection of their eccentricity. The modular quick-change structure supports rapid switching between multiple brake housing models, and the flexible contact mechanism effectively buffers manufacturing errors. The overall solution, while ensuring detection accuracy, solves the industry pain points of poor adaptability and high cost of vulnerable parts in traditional equipment, providing a highly reliable solution for efficient and precise detection of non-motorized vehicle parts.

Description

Technical Field

[0001] This invention relates to the field of brake manufacturing technology, specifically to a device for detecting the dimensions of a non-motorized vehicle brake housing. Background Technology

[0002] The brake housing of non-motorized vehicles is the core load-bearing component of the braking system of electric bicycles, electric motorcycles, and other non-motorized vehicles. It is usually made of aluminum alloy die casting or steel plate stamping. It houses the brake shoes, return springs, and other actuators. Externally, it is precisely assembled with the frame and wheel hub through stepped bosses. These bosses not only bear the mechanical function of transmitting braking force, but their dimensional accuracy also directly affects the uniformity of contact during braking. If the roundness of the boss exceeds the tolerance by 0.1mm, it will cause radial runout after the brake housing is assembled with the wheel hub, resulting in abnormal braking noise and uneven wear of the friction pads. If the coaxiality deviation between two bosses is >0.15mm, it may cause oil seal failure and oil leakage, endangering driving safety. According to national standards, the radial tolerance of the stepped bosses must be controlled at IT10 grade, with roundness ≤0.08mm and cylindricity ≤0.12mm. It is also necessary to conduct full circumferential inspection to identify discrete defects such as local dents and burrs.

[0003] However, in traditional casting or stamping processes, uneven metal cooling and shrinkage can easily lead to fluctuations in the circumferential dimensions of bosses. Existing inspection devices generally use contact plug gauges or single-point laser sensors. The former measures by rigid insertion, which can easily scratch the surface of the boss and can only detect 4-6 discrete points, failing to detect local circumferential deviations. The latter, although non-contact, cannot adapt to the radial differences of stepped bosses due to its fixed sensor array layout. Custom tooling is required for different specifications, resulting in high changeover costs and making it difficult to meet the inspection needs of small and medium-sized enterprises producing multiple models. This lag in inspection methods directly leads to a high average missed detection rate in the industry, becoming a key bottleneck restricting the quality upgrade of brake housings. Summary of the Invention

[0004] The purpose of this invention is to provide a non-motor vehicle brake housing size detection device to solve the problems mentioned in the background above, such as that traditional detection devices are not only prone to scratching the surface of the boss, but also cannot detect local out-of-tolerance in the circumferential direction.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a non-motor vehicle brake housing size detection device, including a detection table, a feed guide rail on the detection table, a pneumatic slider slidably connected on the feed guide rail, a detection tray fixedly connected to the pneumatic slider by bolts, and a brake housing to be detected placed on the detection tray.

[0006] Dimension detection mechanisms are provided on both sides of the feed guide rail. Each dimension detection mechanism includes two sets of T-shaped brackets. A first detection plate and a second detection plate are fixedly connected to the T-shaped brackets. Detection grooves are provided on both the first and second detection plates. Sliding blocks are slidably connected in the detection grooves. A stepper motor is fixedly installed on the sliding block. A first pulley is fixedly connected to the output shaft of the stepper motor through a keyway. A second pulley is connected to the first pulley through a synchronous belt drive. A detection drive wheel is fixedly connected to one side of the second pulley. Laser displacement sensors are fixedly installed on the first and second detection plates. A reflector is fixedly installed on the sliding block.

[0007] In one example, two sets of T-shaped supports are symmetrically distributed on the feed guide with the feed guide as the axis of symmetry, and the T-shaped supports are parallel to the feed guide.

[0008] In one example, a rotating tray is rotatably connected to the detection tray via bearings. The diameter of the rotating tray is smaller than the inner diameter of the brake housing. The distance between the second detection plates on the two sets of T-shaped brackets is greater than the distance between the first detection plates on the two sets of T-shaped brackets.

[0009] In one example, the detection grooves are evenly distributed on the first detection plate and the second detection plate, and the spacing between adjacent detection grooves on the first detection plate and the second detection plate is equal. The detection grooves on the first detection plate and the detection grooves on the second detection plate are staggered.

[0010] In one example, the brake housing has a first boss and a second boss for the dimension to be measured. Both the first boss and the second boss are circular, and the diameter of the first boss is smaller than that of the second boss.

[0011] In one example, the detection drive wheel on the first detection plate makes rolling contact with the outer edge of the first boss, and the detection drive wheel on the second detection plate makes rolling contact with the outer edge of the second boss.

[0012] In one example, a positioning rod is fixedly connected inside the detection chute, the positioning rod passes through the sliding block, and a return spring is provided on the outer sleeve of the positioning rod. The return spring is located between the detection chute and the sliding block. Limiting blocks are fixedly connected to both sides of the sliding block, and limiting grooves are opened on both sides of the detection chute. The limiting blocks and the limiting grooves are slidably connected, and the length of the limiting grooves in each set of detection chutes is the same.

[0013] In one example, an additional set of clearance slots is provided between adjacent detection slots on the first detection plate, and the positions of the clearance slots correspond to the positions of the detection slots on the second detection plate.

[0014] In one example, there is a one-to-one correspondence between the laser displacement sensor and the reflector, and the initial distance between each set of laser displacement sensors and reflectors is equal.

[0015] In one example, the formula for calculating the brake housing diameter is:

[0016] ;

[0017] L1 and L2 above represent the length and width of the initial rectangular distribution of the detection drive wheels tangent to the four sets of brake housings; d A d B d C d D The distances traveled by the four detection drive wheels are measured using a laser displacement sensor in conjunction with a reflector. l1 and l2 are the upper and lower base lengths when the four detection drive wheels are arranged in an isosceles trapezoidal shape during detection, calculated using the initial rectangular dimensions and the travel distances of the detection drive wheels. D is the diameter of the brake housing. Compared with the prior art, the beneficial effects of this invention are as follows:

[0018] This invention proposes a non-motorized vehicle brake housing size detection device. This device utilizes an elastic floating differential measurement structure to achieve precise detection of stepped boss dimensions, avoiding damage to the workpiece from rigid contact. An asymmetric staggered groove design adapts to the radial difference of the stepped boss, and, in conjunction with a rotating tray, achieves 360° full circumferential size coverage. The isosceles trapezoidal layout calculation algorithm eliminates the need for a preset center, directly calculating the diameter from the displacement difference, significantly improving the detection compatibility of eccentric workpieces and enabling the detection of their eccentricity. A modular quick-change structure supports rapid switching between multiple brake housing models, and a flexible contact mechanism effectively buffers manufacturing errors. The overall solution, while ensuring detection accuracy, addresses the industry pain points of poor adaptability and high cost of vulnerable parts in traditional equipment, providing a highly reliable solution for efficient and precise detection of non-motorized vehicle parts. Attached Figure Description

[0019] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts. Wherein:

[0020] Figure 1 The schematic diagram shows the external structure of a non-motor vehicle brake housing size detection device according to an embodiment of the present invention.

[0021] Figure 2 The schematic diagram shows a dimension detection mechanism of a non-motor vehicle brake housing dimension detection device according to an embodiment of the present invention.

[0022] Figure 3 The schematic diagram shows a front view of the dimension detection mechanism of a non-motor vehicle brake housing dimension detection device according to an embodiment of the present invention.

[0023] Figure 4 The schematic diagram shows the bottom structure of the dimension detection mechanism of a non-motor vehicle brake housing dimension detection device according to an embodiment of the present invention;

[0024] Figure 5 The schematic diagram shows a bottom view of the brake housing structure of a non-motor vehicle brake housing size detection device according to an embodiment of the present invention.

[0025] Figure 6 The schematic diagram shows a top view of the brake housing structure of a non-motor vehicle brake housing size detection device according to an embodiment of the present invention.

[0026] Figure 7 The schematic diagram shows a front view of the brake housing structure of a non-motor vehicle brake housing size detection device according to an embodiment of the present invention.

[0027] Figure 8 The schematic diagram shows a laser displacement sensor structure of a non-motor vehicle brake housing size detection device according to an embodiment of the present invention;

[0028] Figure 9 The schematic diagram shows a brake housing structure of a non-motor vehicle brake housing size detection device according to an embodiment of the present invention;

[0029] Figure 10 This illustration schematically shows a non-motor vehicle brake housing size detection device according to an embodiment of the present invention. Figure 4 Enlarged structural diagram at point A in the middle.

[0030] The following are the labeling elements in the diagram: 1. Inspection table; 2. Feed guide rail; 3. Pneumatic slider; 4. Inspection tray; 5. Rotary tray; 6. Brake housing; 601. First boss; 602. Second boss; 7. Dimension inspection mechanism; 8. T-shaped bracket; 9. First inspection plate; 10. Second inspection plate; 11. Inspection groove; 12. Sliding block; 1201. Limiting block; 1202. Limiting groove; 13. Positioning rod; 14. Return spring; 15. Stepper motor; 16. First pulley; 17. Second pulley; 18. Inspection drive wheel; 19. Laser displacement sensor; 20. Reflector; 21. Clearance groove. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 are within the scope of protection of the present invention.

[0032] like Figure 1-10 As shown, a non-motorized vehicle brake housing size detection device includes a detection platform 1. A feed guide rail 2 is horizontally arranged on the detection platform 1, and the feed guide rail 2 is fixed to the top surface of the detection platform 1 by symmetrically arranged support seats. A pneumatic slider 3 is slidably connected to the feed guide rail 2, and the pneumatic slider 3 is rigidly connected to the bottom surface of a detection tray 4 by bolts. A rotating tray 5 is rotatably connected to the top surface of the detection tray 4 by a deep groove ball bearing. The diameter of the rotating tray 5 is designed to be 3-5 mm smaller than the inner diameter of the brake housing 6, to achieve 360° interference-free rotation detection of the tested part.

[0033] The detection tray 4 carries the brake housing 6 to be tested. The housing has a stepped first protrusion 601 and a second protrusion 602 around its circumference. The first protrusion 601 with a diameter of 110 mm is located inside the second protrusion 602 with a diameter of 130 mm, forming a stepped detection feature.

[0034] Dimension detection mechanisms 7 are symmetrically arranged on both sides of the feed guide rail 2. Two sets of T-shaped brackets 8 are mirror-distributed around the axis of symmetry of the feed guide rail 2, and the longitudinal support arms of the T-shaped brackets 8 maintain a parallelism of 0.02 mm / m with the feed guide rail 2. The bottom surface of the transverse support arm of each set of T-shaped brackets 8 is fixed to the first detection plate 9 and the second detection plate 10, respectively. The spacing of the first detection plate 9 is designed to be 4-6 mm larger than the spacing of the second detection plate 10 to match the radial dimension difference of the stepped boss.

[0035] The first detection plate 9 and the second detection plate 10 have evenly distributed detection grooves 11 on their facing surfaces. The center distance between adjacent grooves is designed to be 1 / 12 of the circumference of the boss of the workpiece being tested, and the grooves of the two plates are staggered at 60°. Each detection groove 11 is provided with a sliding block 12, which forms a sliding pair with the bottom surface of the groove through a positioning rod 13. A return spring 14 is fitted on the outside of the positioning rod 13 to form an elastic floating structure, wherein the spring preload is 15-20N. The limiting blocks 1201 on both sides of the sliding block 12 and the limiting groove 1202 of the groove form an H7 / h6 clearance fit. The effective stroke of the limiting groove 1202 is uniformly set to 5mm to ensure the consistency of floating at each detection point.

[0036] A stepper motor 15 is fixedly mounted at the front end of the sliding block 12. Its output shaft is connected to a Φ20mm first pulley 16 via a flat key, which drives a Φ15mm second pulley 17 via a synchronous belt, ultimately driving the detection drive wheel 18. The detection drive wheel 18 is a polyurethane wheel with a Shore hardness of 85A. During detection, the drive wheel of the first detection plate 9 forms rolling contact with the outer edge of the first boss 601, with a contact pressure of 20-30N. The drive wheel of the second detection plate 10 contacts the outer edge of the second boss 602. Perimeter scanning is achieved through rotational drive.

[0037] Laser displacement sensors 19 are evenly distributed on the back of the detection plate, with each sensor corresponding to a reflector 20 on the back of the sliding block 12. The initial spacing is uniformly calibrated to 50mm ± 0.01mm, forming a differential measurement system. When the sliding block 12 moves radially with the boss, the laser displacement difference ΔL is processed by an algorithm to directly output parameters such as the roundness and diameter of the boss.

[0038] The specially designed clearance groove 21 is opened between the adjacent slide grooves of the first detection plate 9 and is offset from the detection slide groove 11 on the second detection plate 10 to ensure that the drive wheel set does not interfere when the two plates move in opposite directions, with a maximum allowable misalignment of 8mm.

[0039] Working principle: Taking the first protrusion 601 as an example, this device is used to detect the diameter of the first protrusion 601. First, the brake housing 6 is placed on the rotating tray 5. Then, the pneumatic slider 3 is activated to send the brake housing 6 into the size detection mechanism 7. As a result, four sets of detection drive wheels 18 will contact the first protrusion 601. At this time, the first protrusion 601 is roughly distributed in an isosceles trapezoidal shape. Since the sliding block 12 is in its extreme position under the push of the return spring 14 in the initial state, and since the length of the limiting groove 1202 in each detection groove 11 is the same, the relative position of the detection drive wheel 18 on each sliding block 12 is known. These are marked as A, B, C, and D. In the initial state, A, B, C, and D are distributed in a rectangle with a length of L1 and a width of L2. The laser displacement sensor 19 can detect the moving distance of the reflector 20, that is, the moving distance of the four detection drive wheels 18 A, B, C, and D, which are respectively d A d B d C d D .

[0040] First, calculate the lengths of the upper and lower bases of the isosceles trapezoid:

[0041] The length l1 of the upper base of the isosceles trapezoid: The upper base is composed of two detection drive wheels 18, C and D, and its length is the initial rectangle width minus the sum of the moving distances of C and D, i.e. .

[0042] The length l2 of the lower base of the isosceles trapezoid: The lower base consists of two driving wheels, A and B, and its length is the initial rectangle length minus the sum of the distances traveled by A and B, i.e. .

[0043] Calculate the diameter D of the first protrusion 601: Let the height of the isosceles trapezoid be h. We can calculate the diameter by constructing geometric relationships. Assume that the extensions of the two legs of the isosceles trapezoid intersect at a point, forming a large isosceles triangle, and the first protrusion 601 is the incircle of this isosceles triangle. We utilize the property of isosceles trapezoids and their incircles: for an isosceles trapezoid with an incircle, its height h is equal to the diameter D of the first protrusion 601.

[0044] We can obtain:

[0045] ;

[0046] Simplifying, we get:

[0047] ;

[0048] L1 and L2 above are the length and width of the initial rectangular distribution of the four sets of detection drive wheels 18, which are known initial parameters; d A d B d C d D The distances traveled by the four detection drive wheels 18 are measured by the laser displacement sensor 19 in conjunction with the reflector 20. l1 and l2 are the lengths of the upper and lower bases of the isosceles trapezoid during detection, respectively, calculated from the initial rectangle dimensions and the distances traveled by the detection drive wheels 18; D is the diameter of the first boss 601.

[0049] Using the above method, not only can the diameter of the first boss 601 be measured quickly and accurately, but also the diameter of the second boss 602 can be measured, as well as whether the first boss 601 and the second boss 602 are eccentric.

[0050] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0051] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for detecting the dimensions of a non-motorized vehicle brake housing, characterized in that: The device includes a testing platform (1), on which a feed guide rail (2) is provided. A pneumatic slider (3) is slidably connected to the feed guide rail (2). A testing tray (4) is fixedly connected to the pneumatic slider (3) by bolts. A brake housing (6) to be tested is placed on the testing tray (4). A first boss (601) and a second boss (602) of the size to be tested are provided on the brake housing (6). The first boss (601) and the second boss (602) are both circular, and the diameter of the first boss (601) is smaller than the diameter of the second boss (602). The feed guide rail (2) is provided with size detection mechanisms (7) on both sides. The size detection mechanism (7) includes two sets of T-shaped brackets (8). A first detection plate (9) and a second detection plate (10) are fixedly connected to the T-shaped brackets (8). The second detection plate (10) is located above the first detection plate (9). Both the first detection plate (9) and the second detection plate (10) are provided with detection grooves (11). A sliding block (12) is slidably connected in the detection groove (11). A stepper motor is fixedly installed on the sliding block (12). (15) A first pulley (16) is fixedly connected to the output shaft of the stepper motor (15) via a keyway. The first pulley (16) is connected to a second pulley (17) via a synchronous belt drive. A detection drive wheel (18) is fixedly connected to one side of the second pulley (17). The detection drive wheel (18) rolls in contact with the outer edge of the brake housing (6). A laser displacement sensor (19) is fixedly installed on the first detection plate (9) and the second detection plate (10). A reflector (20) is fixedly installed on the sliding block (12).

2. The non-motorized vehicle brake housing size detection device as described in claim 1, characterized in that: The two sets of T-shaped supports (8) are symmetrically distributed on the feed guide rail (2) with the feed guide rail (2) as the axis of symmetry, and the T-shaped supports (8) are parallel to the feed guide rail (2).

3. The non-motorized vehicle brake housing size detection device as described in claim 2, characterized in that: The detection tray (4) is rotatably connected to a rotating tray (5) via a bearing. The diameter of the rotating tray (5) is smaller than the inner diameter of the brake housing (6). The distance between the second detection plates (10) on the two sets of T-shaped brackets (8) is greater than the distance between the first detection plates (9) on the two sets of T-shaped brackets (8).

4. The non-motorized vehicle brake housing size detection device as described in claim 1, characterized in that: The detection grooves (11) are evenly distributed on the first detection plate (9) and the second detection plate (10), and the spacing between adjacent detection grooves (11) on the first detection plate (9) and the second detection plate (10) is equal. The detection grooves (11) on the first detection plate (9) and the detection grooves (11) on the second detection plate (10) are staggered.

5. The non-motorized vehicle brake housing size detection device as described in claim 1, characterized in that: The detection drive wheel (18) on the first detection plate (9) rolls in contact with the outer edge of the first boss (601), and the detection drive wheel (18) on the second detection plate (10) rolls in contact with the outer edge of the second boss (602).

6. The non-motorized vehicle brake housing size detection device as described in claim 1, characterized in that: A positioning rod (13) is fixedly connected inside the detection slide (11). The positioning rod (13) passes through the sliding block (12). A reset spring (14) is provided on the outer sleeve of the positioning rod (13). The reset spring (14) is located between the detection slide (11) and the sliding block (12). Limiting blocks (1201) are fixedly connected on both sides of the sliding block (12). Limiting grooves (1202) are opened on both sides of the detection slide (11). The limiting blocks (1201) and the limiting grooves (1202) are slidably connected. The length of the limiting grooves (1202) in each set of the detection slide (11) is the same.

7. The non-motorized vehicle brake housing size detection device as described in claim 4, characterized in that: An additional set of clearance grooves (21) is provided between adjacent detection grooves (11) on the first detection plate (9), and the clearance grooves (21) are located in a position corresponding to the detection grooves (11) on the second detection plate (10).

8. The non-motor vehicle brake housing size detection device as described in claim 1, characterized in that: The laser displacement sensor (19) and the reflector (20) are in one-to-one correspondence, and the initial distance between each set of laser displacement sensors (19) and reflectors (20) is equal.

9. The non-motor vehicle brake housing size detection device as described in claim 1, characterized in that: The formula for calculating the diameter of the brake housing (6) is as follows: ； L1 and L2 above are the length and width of the initial rectangular distribution of the four sets of detection drive wheels (18) tangent to the brake housing (6); d A d B d C d D The distances of movement of the four detection drive wheels (18) are measured by the laser displacement sensor (19) and the reflector (20), and are calculated by the initial rectangular size and the distances of movement of the detection drive wheels (18); D is the diameter of the brake housing (6).

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