Brake caliper piston return amount testing fixture
By integrating measurement components and lever structure design, the problem of poor adaptability and repeated disassembly of traditional testing equipment in confined spaces is solved, enabling efficient and accurate measurement of brake caliper piston return, thus improving testing efficiency and accuracy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-22
- Publication Date
- 2026-03-06
AI Technical Summary
Traditional brake caliper piston return measurement equipment is difficult to deploy effectively in confined spaces, resulting in a complex and inefficient testing process that requires multiple disassemblies and adjustments, making it difficult to meet the high-efficiency and accurate measurement requirements of mass production and quality inspection.
A brake caliper piston return measuring fixture was designed, which adopts an integrated measuring component, including a measuring seat, a measuring rod, a spring, and an L-shaped rotating plate. The spring preload makes the measuring rod dynamically fit with the piston end face. Combined with the lever structure of the L-shaped rotating plate, it realizes instant conversion and scale recording of dial gauges, avoiding multiple disassemblies and repeated measurements.
It significantly reduces the size of the detection device, improves measurement accuracy and efficiency, avoids gap errors, and achieves efficient and accurate measurement in confined spaces.
Smart Images
Figure CN223976592U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of brake caliper technology, specifically to a brake caliper piston return measuring tool. Background Technology
[0002] In automotive braking systems, the piston return distance of the brake caliper is one of the key parameters affecting braking performance and safety. Piston return distance refers to the distance the brake caliper piston retracts from the surface of the brake disc after the brake is released. Appropriate return distance ensures a proper clearance between the brake pads and the brake disc, avoiding problems such as brake drag or insufficient braking force. Excessive return distance may lead to delayed brake response and increased brake free travel; insufficient return distance may cause abnormal friction between the brake pads and the brake disc, resulting in overheating, accelerated wear, or even brake failure, seriously affecting driving safety.
[0003] Currently, the industry typically uses piston return measurement test benches for this purpose. However, for fixed calipers, the piston installation space is limited, making it difficult for traditional testing equipment to be effectively deployed within this confined space, resulting in a complex and inefficient testing process. Furthermore, existing testing methods often require multiple disassemblies and adjustments, increasing both operational difficulty and production costs. Especially in mass production or quality inspection processes, traditional testing methods struggle to meet the demands for efficient and accurate measurement. Utility Model Content
[0004] The purpose of this invention is to address the problems existing in the prior art by providing a brake caliper piston return measuring tool, which greatly reduces the size of the testing device and solves the problem of poor space adaptability of traditional equipment; it avoids the gap error in traditional mechanical measurement and significantly improves the measurement accuracy; it avoids multiple disassemblies and repeated measurements, and greatly improves efficiency.
[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0006] A brake caliper piston return measuring tool includes a base plate, a vertical plate and a fixed plate connected to the base plate, a measuring assembly connected to the vertical plate, and a caliper body assembly connected to the fixed plate. The measuring assembly is located between two caliper pistons of the caliper body assembly. The measuring assembly includes a measuring seat connected to the vertical plate, an inner cavity and a first mounting groove and a second mounting groove connected to the inner cavity. An axially movable measuring rod is provided in the first mounting groove, one end of which extends out of the measuring seat and is used to make perpendicular contact with the end face of the caliper piston. A spring is connected between the stepped surface of the measuring rod and the first mounting groove. A fixed shaft pin is provided in the inner cavity, and the fixed shaft pin is connected to an L-shaped rotating plate. The other end of the measuring rod extends into the inner cavity and abuts against one end of the L-shaped rotating plate. A dial gauge is connected to the second mounting groove, and the probe of the dial gauge abuts against the other end of the L-shaped rotating plate.
[0007] Furthermore, a C-shaped dial gauge sleeve is provided on the inner side of the second mounting groove, and the needle tube of the dial gauge is fitted inside the dial gauge sleeve; the measuring seat is provided with a threaded hole connected to the second mounting groove, and an adjusting screw is connected to the threaded hole, the adjusting screw being used to tighten the dial gauge sleeve.
[0008] Furthermore, a threaded sleeve is threadedly connected to the inner side of the first mounting groove, and the measuring rod is axially movable within the threaded sleeve.
[0009] Furthermore, the upright plate is connected to four measuring seats, wherein every two measuring seats are used to measure the return amount of the caliper piston on the corresponding side.
[0010] Furthermore, a copper sleeve is provided at the corner of the L-shaped rotating plate, and the L-shaped rotating plate is rotatably connected to the fixed shaft pin through the copper sleeve.
[0011] Furthermore, the upright plate and the fixed plate are respectively fixed to the base plate by the first bolt, the measuring seat is fixed to the upright plate by the third bolt, and the caliper assembly is fixed to the fixed plate by the second bolt.
[0012] Compared with the prior art, the beneficial effects of this utility model are:
[0013] 1. An integrated measurement component is adopted and placed directly between two caliper pistons. Through the compact layout of the inner cavity of the measuring seat, the first mounting slot and the second mounting slot, the volume of the detection device is greatly reduced, enabling it to complete the measurement efficiently in a limited space, thus solving the problem of poor space adaptability of traditional equipment.
[0014] 2. The spring-loaded measuring rod ensures that the head of the measuring rod is always dynamically in contact with the piston end face, thus ensuring the stability of the measurement reference. At the same time, the axial movement of the measuring rod is accurately transmitted to the dial gauge through the lever structure of the L-shaped rotating plate, avoiding the gap error in traditional mechanical measurement and significantly improving the measurement accuracy.
[0015] 3. Through the dynamic contact between the spring preload and the piston end face, the measuring rod can move synchronously with the piston. Combined with the lever structure of the L-shaped rotating plate, it realizes the instantaneous conversion of the return value and the scale recording of the dial gauge, avoiding multiple disassemblies and repeated measurements, and greatly improving efficiency. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a schematic diagram of the mounting structure of the caliper body assembly and the gauge in an embodiment of this application;
[0018] Figure 2 This is a schematic diagram of the structure of the inspection tool in the embodiments of this application;
[0019] Figure 3 This is a cross-sectional view of the caliper assembly and the gauge in an embodiment of this application, wherein the piston is in the extended state;
[0020] Figure 4 This is a cross-sectional view of the caliper assembly and the gauge in an embodiment of this application, wherein the piston is in a retracted state;
[0021] In the diagram: 100, base plate; 102, first bolt; 200, second bolt; 300, fixing plate; 400, measuring assembly; 500, upright plate; 401, measuring seat; 402, adjusting screw; 403, dial indicator sleeve; 404, threaded sleeve; 405, measuring rod; 406, spring; 407, L-shaped rotating plate; 408, copper sleeve; 409, fixing pin; 410, third bolt; 600, dial indicator gauge; 700, caliper body assembly; 701, caliper piston. Detailed Implementation
[0022] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0023] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They 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. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0024] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0025] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0026] In automotive braking systems, the piston return distance of the brake caliper is one of the key parameters affecting braking performance and safety. Piston return distance refers to the distance the brake caliper piston retracts from the surface of the brake disc after the brake is released. Appropriate return distance ensures a proper clearance between the brake pads and the brake disc, avoiding problems such as brake drag or insufficient braking force. Excessive return distance may lead to delayed brake response and increased brake free travel; insufficient return distance may cause abnormal friction between the brake pads and the brake disc, resulting in overheating, accelerated wear, or even brake failure, seriously affecting driving safety.
[0027] Currently, the industry typically uses piston return measurement test benches for this purpose. However, for fixed calipers, the piston installation space is limited, making it difficult for traditional testing equipment to be effectively deployed within this confined space, resulting in a complex and inefficient testing process. Furthermore, existing testing methods often require multiple disassemblies and adjustments, increasing both operational difficulty and production costs. Especially in mass production or quality inspection processes, traditional testing methods struggle to meet the demands for efficient and accurate measurement.
[0028] To address the above technical problems, this application provides a brake caliper piston return measuring tool, including a base plate 100, a vertical plate 500 and a fixed plate 300 connected to the base plate 100, a measuring assembly 400 connected to the vertical plate 500, and a fixed plate 300 for connecting the caliper body assembly 700. The measuring assembly 400 is disposed between the two caliper pistons 701 of the caliper body assembly 700. The measuring assembly 400 includes a measuring seat 401 connected to the vertical plate 500, the measuring seat 401 having an inner cavity and a first mounting groove and a second mounting groove connected to the inner cavity. A first mounting slot contains an axially movable measuring rod 405. One end of the measuring rod 405 extends out of the measuring seat 401 and is used to make perpendicular contact with the end face of the caliper piston 701. A spring 406 is connected between the stepped surface of the measuring rod 405 and the first mounting slot. A fixed shaft pin 409 is provided in the inner cavity. The fixed shaft pin 409 is connected to an L-shaped rotating plate 407. The other end of the measuring rod 405 extends into the inner cavity and abuts against one end of the L-shaped rotating plate 407. A second mounting slot is connected to a dial gauge 600. The probe of the dial gauge 600 abuts against the other end of the L-shaped rotating plate 407.
[0029] Pressurization is applied to the caliper cylinder via the caliper hose to simulate the working state of the caliper during vehicle braking. Under this pressure, the caliper piston 701 moves forward until it contacts the end face of the vertical plate 500 and stops. After the pressure stabilizes, the head of the measuring rod 405, under the preload of the spring 406, fits tightly against the piston end face, forming the initial measurement reference. At this point, the dial gauge 600 records the initial scale value.
[0030] After the pressure inside the caliper cylinder is released, the caliper piston 701 retracts. Since the head of the probe 405 is always in close contact with the piston end face through the spring 406, the probe 405 retracts synchronously with the piston. The L-shaped rotating plate 407 rotates counterclockwise, and the probe of the dial gauge 600 extends downward with the rotation, and the scale value of the dial gauge changes accordingly. That is, the retraction of the probe 405 is transmitted to the dial gauge 600 through the lever structure of the L-shaped rotating plate 407.
[0031] By comparing the difference in scale readings of the dial gauge 600 when it is under pressure and after pressure release, the return amount of the caliper piston 701 can be determined. According to the lever principle, when the upper swing arm of the L-shaped rotating plate 407 is perpendicular to the probe, the horizontal distance L1 from the measuring rod 405 to the corner is equal to the vertical distance L2 from the probe to the corner, ensuring the linear transmission of the measured value.
[0032] In this embodiment, the fixture features a compact, integrated design, directly embedding the measuring component 400 between the two pistons 701 of the caliper assembly 700, thus avoiding the dependence on external space inherent in traditional testing benches. The measuring components are integrated into the inner cavity of the measuring seat 401, the first mounting slot, and the second mounting slot, compressing the overall size of the device and enabling efficient testing within confined spaces.
[0033] Through the preload of spring 406 and the dynamic contact between the spring and piston end face, the measuring rod 405 can move synchronously with the piston. Combined with the lever structure of L-shaped rotating plate 407, it realizes the instantaneous conversion of return amount and the scale recording of dial gauge 600, avoiding multiple disassemblies and repeated measurements, and greatly improving efficiency.
[0034] In some embodiments, a dial gauge sleeve 403 is provided inside the second mounting groove, and the needle tube of the dial gauge 600 is fitted inside the dial gauge sleeve 403; the measuring seat 401 is provided with a threaded hole connected to the second mounting groove, and an adjusting screw 402 is connected to the threaded hole, the adjusting screw 402 being used to press the dial gauge sleeve 403.
[0035] A gauge sleeve 403 is provided on the inner side of the second mounting slot. The inner hole of the gauge sleeve 403 matches the outer diameter of the needle tube of the dial gauge 600. The needle tube of the dial gauge 600 is inserted into the gauge sleeve 403. The axial positioning of the gauge is achieved by pressing the gauge sleeve 403 with the adjusting screw 402, ensuring stable contact between the probe and the L-shaped rotating plate 407.
[0036] In some embodiments, a threaded sleeve 404 is threadedly connected to the inner side of the first mounting groove, and the measuring rod 405 is axially movable within the threaded sleeve 404.
[0037] The inner side of the first mounting groove is connected to a threaded sleeve 404, and the inner hole of the sleeve 404 forms a sliding fit with the outer diameter of the measuring rod 405. The measuring rod 405 can slide freely axially within the sleeve 404, but its radial position is limited by the inner wall of the sleeve 404, ensuring the straightness of the measuring rod 405's movement trajectory, thereby improving measurement accuracy.
[0038] In some embodiments, the stand plate 500 is connected to four measuring seats 401, wherein every two measuring seats 401 are used to measure the return amount of the caliper piston 701 on the corresponding side.
[0039] The upright plate 500 is connected to four measuring seats 401, with each pair of measuring seats 401 symmetrically distributed on both sides of the upright plate 500, corresponding to the left and right pistons 701 of the caliper assembly 700 respectively. Each measuring seat 401 has an independent measuring rod 405, spring 406, L-shaped rotating plate 407, and dial gauge 600, which can independently sense the displacement of the corresponding side piston 701 and convert it into a scale value. By integrating four measuring seats 401, the return amount of the left and right pistons 701 can be measured synchronously in one pressurization / depressurization cycle. The synchronous measurement with two measuring seats 401 on each side can reduce measurement error.
[0040] In some embodiments, a copper sleeve 408 is provided at the corner of the L-shaped rotating plate 407, and the L-shaped rotating plate 407 is rotatably connected to the fixed shaft pin 409 through the copper sleeve 408.
[0041] A copper sleeve 408 is embedded at the corner of the L-shaped rotating plate 407, and the inner hole of the copper sleeve 408 forms a rotational fit with the fixed shaft pin 409. When the measuring rod 405 extends with the retraction of the piston 701, the L-shaped rotating plate 407 rotates counterclockwise around the axis of the copper sleeve 408 and the fixed shaft pin 409, and the probe of the dial gauge 600 moves axially accordingly. The copper sleeve 408 can reduce rotational resistance and improve the linearity of displacement transmission.
[0042] In some embodiments, the upright plate 500 and the fixed plate 300 are respectively fixed to the base plate 100 by the first bolt 102, the measuring seat 401 is fixed to the upright plate 500 by the third bolt 410, and the caliper body assembly 700 is fixed to the fixed plate 300 by the second bolt 200.
[0043] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A brake caliper piston back-off gauge, comprising: The utility model provides a caliper body assembly (700) and a measuring assembly (400) are connected through a fixed plate (300) and a vertical plate (500), the measuring assembly (400) is arranged between two caliper pistons (701) of the caliper body assembly (700), the measuring assembly (400) is arranged between two caliper pistons (701) of the caliper body assembly (700), and the measuring assembly (400) is arranged between two caliper pistons (701) of the caliper body assembly (700). The measuring assembly (400) comprises a measuring seat (401) connected with the vertical plate (500), the measuring seat (401) is provided with an inner cavity, a first mounting groove and a second mounting groove connected with the inner cavity, an axially movable measuring rod (405) is arranged in the first mounting groove, one end of the measuring rod (405) extends out of the measuring seat (401) and is used for vertically contacting the end face of the caliper piston (701), and a spring (406) is connected between the step surface of the measuring rod (405) and the first mounting groove. The inner cavity is provided with a fixed shaft pin (409), the fixed shaft pin (409) is connected with an L-shaped rotating plate (407), the other end of the measuring rod (405) extends into the inner cavity and abuts against one end of the L-shaped rotating plate (407). The second mounting groove is connected with a dial gauge (600), and the probe of the dial gauge (600) abuts against the other end of the L-shaped rotating plate (407).
2. A brake caliper piston back-off gauge according to claim 1, wherein, The inner side of the second mounting groove is provided with a C-shaped dial sleeve (403), and the needle tube of the dial gauge (600) is sleeved in the dial sleeve (403); the measuring seat (401) is provided with a threaded hole connected with the second mounting groove, the threaded hole is connected with an adjusting screw (402), and the adjusting screw (402) is used for pressing the dial sleeve (403).
3. A brake caliper piston back-off gauge according to claim 1, wherein, The inner side of the first mounting groove is connected with a screw sleeve (404) through threads, and the measuring rod (405) is arranged in the screw sleeve (404) and can axially move.
4. A brake caliper piston back-off gauge according to claim 1, wherein, The vertical plate (500) is connected with four measuring seats (401), and every two measuring seats (401) are used for measuring the return amount of the caliper piston (701) on the corresponding side.
5. A brake caliper piston back-off gauge according to claim 1, wherein, The corner of the L-shaped rotating plate (407) is provided with a copper sleeve (408), and the L-shaped rotating plate (407) is rotationally connected with the fixed shaft pin (409) through the copper sleeve (408).
6. A brake caliper piston back-off gauge according to claim 1, wherein, The vertical plate (500) and the fixed plate (300) are fixed with the bottom plate (100) through first bolts (102), the measuring seat (401) and the vertical plate (500) are fixed through third bolts (410), and the caliper body assembly (700) and the fixed plate (300) are fixed through second bolts (200).