Calibration device of brake clamp unit relief clearance test bench

Abstract

The utility model provides a calibration device for a brake clamp unit relief clearance test bench. The calibration device comprises a connecting shaft, a calibration device and a calibration device, the two simulation brake pads are arranged oppositely, and the two simulation brake pads are connected to the connecting shaft in a sliding mode in the axis direction of the connecting shaft; the adjusting screw rod is in threaded connection between the two simulation brake pads so as to drive the two simulation brake pads to get close to each other or get away from each other; the force calibration units are arranged on the two opposite inner side surfaces of the two simulation brake pads so as to obtain the pressure borne by the simulation brake pads; and the length calibration unit is connected between the two simulation brake pads to obtain the distance between the two simulation brake pads. The calibration device provided by the utility model can realize the calibration of the distance between the brake pads in the release state of the brake clamp unit and the calibration of the opening force of the test bench, thereby ensuring the accuracy of the test bench in the actual test process.

Description

Technical Field

[0001] The utility model relates to the technical field of testing the braking device of a locomotive vehicle, in particular to a calibration device for a brake clamp unit relief clearance testing bench. Background Art

[0002] As one of the core components to ensure the safe operation of EMUs, the brake caliper unit must undergo strict testing before leaving the factory, and can only be shipped and put into use after all indicators are qualified. As one of its key technical indicators, the relief clearance directly affects the braking ability of the brake caliper unit. The appropriate relief clearance can also effectively reduce the probability of abnormal wear of the brake disc, metal inlay and other faults.

[0003] like Figure 1 As shown, the brake caliper unit 72 has an automatic clearance adjustment function, which can compensate for the clearance caused by the wear of the brake pad 71 and the brake disc 70. This ensures that after the brake caliper unit 72 is relieved during use, the clearance between the brake pads 71 ​​on both sides and the brake disc 70 is a fixed value, which is defined as the relief clearance S when the caliper unit leaves the factory.

[0004] The relief clearance S is usually tested using a brake caliper unit relief clearance test bench 80 before leaving the factory, such as Figure 2 As shown. The test bench measures the gaps between the brake pad 71 and the brake disc 70 at the corresponding positions through four laser displacement sensors installed on the test bench dummy disc, and obtains the relief gap S through the fitting algorithm. During the test, the brake caliper unit 72 is first adjusted to the fully reset state, and the test bench is operated to inflate and exhaust the brake caliper unit 72 with fixed pressure compressed air for multiple times until the measured value reaches stability, and this value is recorded as the relief gap S.

[0005] At present, for test benches, usually only the accuracy of laser sensors is calibrated. There is no special calibration method for other factors that affect the test results, mainly including the following aspects:

[0006] (1) Sensor layout and data acquisition calculation

[0007] The test bench uses 4 laser displacement sensors arranged at four locations to test the relief gap. During the test, the data of the 4 sensors are collected synchronously, and then the relief gap is calculated using a fixed algorithm. Therefore, the sensor installation position, data collection time, calculation algorithm, etc. all have an impact on the test results.

[0008] (2) Brake caliper unit test status

[0009] The components of the brake caliper unit under test are connected in a hinged manner with holes and shafts, and in order to ensure the flexibility of the clamp mechanism, clearance is used between the holes and shafts. When in the free state of relief, due to the influence of factors such as the tension of the hanging point, gravity, and uneven sliding friction, it is difficult to ensure that the matching state of each hole and shaft is consistent with the braking state, resulting in deviations in the relative difference between the braking and relief states obtained by calculation, that is, the relief clearance. In order to eliminate the influence of this uncertainty, the brake caliper unit relief clearance test bench includes a spreading mechanism. When relieved, the mechanism spreads the dummy disc with a fixed force value, pushes the components on the brake caliper unit, and makes the hole and shaft match in a state basically consistent with that during braking, thereby eliminating the influence on the relief clearance measurement. However, there is currently no calibration device and calibration method for the relief state of the brake caliper unit and the spreading force of the test bench. Utility Model Content

[0010] The utility model aims to provide a brake caliper unit relief clearance test bench calibration device, which realizes the calibration of the distance between brake pads in the relief state of the brake caliper unit and the calibration of the test bench opening force, thereby ensuring the accuracy of the test bench during the actual test process.

[0011] The utility model provides a brake caliper unit relief clearance test bench calibration device, which comprises:

[0012] Connecting shaft;

[0013] Two simulated brake pads are arranged opposite to each other, and are slidably connected to the connecting shaft along the axis direction of the connecting shaft;

[0014] An adjusting screw, threadedly connected between the two simulated brake pads to drive the two simulated brake pads to move closer to or away from each other;

[0015] A force calibration unit is provided on two inner sides of the two simulated brake pads facing each other to obtain the pressure exerted on the simulated brake pads;

[0016] The length calibration unit is connected between the two simulated brake pads to obtain the distance between the two simulated brake pads.

[0017] The brake caliper unit relief clearance test bench calibration device described in the utility model adopts a combination mechanism with higher matching accuracy to replace the actual brake caliper unit, which not only realizes the restoration of the test bench test conditions, but also eliminates the influence of the product clearance on the calibration process.

[0018] The brake caliper unit relief clearance test bench calibration device described in the utility model uses the data collected by the length calibration unit to calibrate the relief clearance, which can accurately reflect the measurement error of the relief clearance of the test bench, and then determine whether the measurement result of the relief clearance measurement component on the test bench is accurate.

[0019] The brake caliper unit relief clearance test bench calibration device described in the utility model collects pressure data through a force calibration unit and compares it with a theoretical calculation result, thereby realizing the calibration of the opening force of the test bench dummy disc, and then judging whether the opening force output by the test bench dummy disc is accurate.

[0020] In a preferred embodiment of the present invention, the force calibration unit has two pressure sensors, and the two pressure sensors are respectively arranged on two inner side surfaces of the two simulated brake pads facing each other.

[0021] In this embodiment, a force sensor and a display connected to the force sensor are directly used to measure the pressure on the simulated brake pad. The test result is relatively accurate and the cost is low.

[0022] In a preferred embodiment of the present invention, the length calibration unit is a grating caliper, and the measurement accuracy and display accuracy of the grating caliper are both less than or equal to 0.01 mm.

[0023] In this embodiment, the grating caliper has high measurement accuracy and can accurately reflect and record the distance between the two simulated gate plates on the calibration device.

[0024] In a preferred embodiment of the present invention, at least two connecting shafts are connected between the two simulated brake pads, and at least two connecting shafts are arranged parallel to each other.

[0025] In this embodiment, at least two connecting shafts are provided between the two simulated brake pads, thereby improving the structural stability of the calibration device and improving the stability of the two simulated brake pads when they are approaching or moving away from each other.

[0026] In a preferred embodiment of the present invention, the test bench calibration device also includes a connecting member, which has a first connecting portion and a second connecting portion, the first connecting portion is connected to the brake caliper unit relief gap test bench, and the second connecting portion is connected to the connecting shaft.

[0027] In this embodiment, the provided connecting piece can fix the calibration device on the brake caliper unit relief clearance test bench, thereby realizing the simulation of the brake caliper unit test process.

[0028] In a preferred embodiment of the present invention, the connecting member further has a third connecting portion, and the adjusting screw is rotatably disposed in the third connecting portion.

[0029] In this embodiment, the provision of the third connection portion can improve the connection strength between the calibration device and the brake caliper unit relief gap test bench, thereby preventing the calibration device from falling due to failure of the connection structure during the calibration process.

[0030] In a preferred embodiment of the present invention, a first connecting hole is respectively opened at the relative position of the two simulated brake pads, and linear bearings are respectively provided in the two first connecting holes, and both ends of the connecting shaft are respectively passed through the two linear bearings.

[0031] In this embodiment, the sliding connection between the simulated brake pad and the connecting shaft can be achieved through the cooperation between the linear bearing and the connecting shaft.

[0032] In a preferred embodiment of the present invention, a second connecting hole is respectively opened at the relative position of the two simulated brake pads, and a first nut and a second nut are respectively provided in the two second connecting holes. The two ends of the adjustment screw respectively have a first threaded portion and a second threaded portion with opposite rotation directions, and the first threaded portion and the second threaded portion are respectively threadedly connected to the first nut and the second nut.

[0033] In this embodiment, the arrangement of the two nuts and the threaded portions respectively matched with the two nuts can enable the two simulated brake pads to approach each other or move away from each other.

[0034] In a preferred embodiment of the present invention, the threads on the first nut, the second nut, the first threaded portion and the second threaded portion are all trapezoidal threads.

[0035] In this embodiment, since the trapezoidal thread has advantages such as good processability, high root strength, and good centering, the transmission effect of the adjustment screw is better.

[0036] In a preferred embodiment of the present invention, one end of the adjusting screw passes through the simulated brake pad and is connected to a rotating hand wheel.

[0037] In this embodiment, the setting of rotating the hand wheel can facilitate the tester to adjust the distance between the two simulated brake pads.

[0038] In a preferred embodiment of the present invention, the parallelism between the measurement reference line of the grating caliper and the axis of the connecting shaft is less than 0.05.

[0039] In this embodiment, the installation accuracy of the grating caliper is improved to ensure that the grating caliper can reflect the spacing between the simulated gate blades in real time and truly. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0041] The drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. Under the guidance of the present invention, those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to specific circumstances.

[0042] Figure 1 This is a schematic diagram of the clearance relief of the brake caliper unit of the utility model;

[0043] Figure 2 This is a structural schematic diagram of the brake caliper unit relief clearance test bench of the utility model;

[0044] Figure 3 It is a structural schematic diagram of a calibration device for a brake caliper unit relief clearance test bench according to the utility model;

[0045] Figure 4 This is a schematic diagram of the assembly structure of the two simulated brake pads of the utility model;

[0046] Figure 5 for Figure 4 A schematic diagram of the side view of the structure shown.

[0047] Description of reference numerals:

[0048] 10. Connecting shaft; 11. Linear bearing;

[0049] 20. Simulated brake pads;

[0050] 30. Adjust the screw; 31. Turn the hand wheel;

[0051] 40. Pressure sensor;

[0052] 50. Grating caliper;

[0053] 60. Connecting member; 61. First connecting portion; 62. Second connecting portion; 63. Third connecting portion;

[0054] 70, brake disc; 71, brake pad; 72, brake caliper unit; S, relief clearance;

[0055] 80. Brake caliper unit relief clearance test bench; DETAILED DESCRIPTION

[0056] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0057] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0059] like Figures 3 to 5 As shown, the utility model provides a brake caliper unit relief clearance test bench calibration device, which includes: a connecting shaft 10; two oppositely arranged simulated brake pads 20, along the axial direction of the connecting shaft 10, the two simulated brake pads 20 are slidably connected to the connecting shaft 10; an adjusting screw 30, threadedly connected between the two simulated brake pads 20 to drive the two simulated brake pads 20 to move closer to or away from each other; a force calibration unit, arranged on the two inner side surfaces facing each other of the two simulated brake pads 20 to obtain the pressure exerted on the simulated brake pads 20; a length calibration unit, connected between the two simulated brake pads 20 to obtain the distance between the two simulated brake pads 20, and the measuring length direction of the length calibration unit is parallel to the axial direction of the connecting shaft 10.

[0060] The brake caliper unit relief clearance test bench calibration device described in the utility model uses a combination mechanism with higher matching accuracy to replace the actual brake caliper unit 72, which not only restores the test bench test conditions, but also eliminates the influence of product clearance on the calibration process.

[0061] The brake caliper unit relief gap test bench calibration device described in the utility model uses the data collected by the length calibration unit to calibrate the relief gap S, which can accurately reflect the measurement error of the relief gap S on the test bench, and then determine whether the measurement result of the relief gap measurement component (laser displacement sensor and corresponding components) on the test bench is accurate.

[0062] The brake caliper unit relief clearance test bench calibration device described in the utility model collects pressure data through a force calibration unit and compares it with a theoretical calculation result, thereby realizing the calibration of the opening force of the test bench dummy disc, and then judging whether the opening force output by the test bench dummy disc is accurate.

[0063] The specific structure and connection relationship of each part of the brake caliper unit relief clearance test bench calibration device described in the utility model will be described below.

[0064] It should be noted that the calibration device described in the utility model needs to be compatible with the existing brake caliper unit clearance test bench 80 (such as Figure 2 The calibration device and the test bench are used together to simulate the test process of the brake caliper unit 72. The accurate data obtained on the calibration device are compared with the data displayed or calculated on the test bench to determine whether there is a large error in the data displayed on the test bench or the actual output. The above-mentioned process of determining whether the test bench can work normally is the calibration process described in the utility model. The error size of the displayed data is determined by comparing the displayed data (the relevant data of the test bench, the data required to determine whether the brake caliper unit 72 is normal during the actual test) with the standard data (relatively accurate data obtained by the calibration device through other means).

[0065] First, if Figure 3 As shown, the calibration device has two relatively arranged simulated brake pads 20. The two simulated brake pads 20 have the same size and are both sheet-like plates. Their specific shapes can be determined according to actual needs. The simulated brake pads 20 are used to simulate the two relatively arranged brake pads 71 ​​in the brake caliper unit 72.

[0066] Two parallel simulated brake pads 20 are connected together by a connecting shaft 10 , and two simulated brake pads 20 are respectively passed through the two ends of the connecting shaft 10 , and the two simulated brake pads 20 are slidingly connected to the connecting shaft 10 , and the simulated brake pads 20 can slide along the axial direction of the connecting shaft 10 .

[0067] Preferably, a plurality of connecting shafts 10 are connected between the two simulated brake pads 20, and the plurality of connecting shafts 10 are arranged parallel to each other; the plurality of connecting shafts 10 can improve the structural stability of the calibration device and improve the stability of the two simulated brake pads 20 when sliding on the connecting shafts 10. Figure 3 As shown, two connecting shafts 10 facing each other up and down are arranged between the two simulated brake pads 20 .

[0068] An adjusting screw 30 is also connected between the two simulated brake pads 20, and both ends of the adjusting screw 30 pass through the two simulated brake pads 20 respectively and are threadedly connected to the two simulated brake pads 20, and the adjusting screw 30 is parallel to the connecting shaft 10. When the adjusting screw 30 is rotated, the two simulated brake pads 20 can slide along the connecting shaft 10 to move closer to each other or away from each other, thereby simulating the process of the two brake pads 71 ​​on the brake caliper unit 72 moving closer to each other to achieve braking or moving away from each other to achieve release.

[0069] The calibration device also includes a force calibration unit, which is arranged on the two inner sides of the two simulated brake pads 20 facing each other to obtain the pressure on the simulated brake pads 20; the force calibration unit can obtain the accurate value of the pressure on the simulated brake pads 20, and then use the accurate value as a judgment standard to compare with the theoretical pressure that needs to be output according to the set value on the test bench, and then judge whether the pressure output of the test bench is accurate. Specifically, the force calibration unit can be various force sensors in the prior art that can directly obtain pressure data.

[0070] The calibration device also includes a length calibration unit, which is connected between the two simulated brake pads 20 to obtain the distance between the two simulated brake pads 20, and the length measurement direction of the length calibration unit is parallel to the axial direction of the connecting shaft 10; the length calibration unit can obtain the accurate value of the relief gap S of the simulated brake pad 20 in the relief state, and then use the accurate value as a judgment standard, and compare it with the relief gap S obtained on the test bench, and then judge whether the measurement result of the relief gap S of the test bench is accurate. Specifically, the length calibration unit can be a high-precision measuring tool used in the prior art for testing length, such as a vernier caliper, a micrometer, etc.

[0071] The structure and technical effects of a preferred implementation of the brake caliper unit relief clearance test bench calibration device of the utility model will be further described below.

[0072] According to one embodiment of the present utility model, Figure 3As shown, the force calibration unit has two pressure sensors 40, one of which is arranged on the inner side of the left simulated brake pad 20 facing the right simulated brake pad 20, and the other pressure sensor 40 is arranged on the inner side of the right simulated brake pad 20 facing the left simulated brake pad 20. The pressure sensor 40 and the display connected to the pressure sensor 40 are directly used to measure the pressure on the simulated brake pad 20, and the test result is relatively accurate and the cost is low.

[0073] When the simulated brake caliper unit 72 is released, the dummy disc opening mechanism on the brake caliper unit release clearance test bench 80 opens the test bench dummy disc through a fixed force value. The test bench dummy disc is located between the two simulated brake pads 20 and can act on the inner side surfaces of the two simulated brake pads 20. The pressure sensor 40 is arranged between the test bench dummy disc and the simulated brake pad 20, and can detect the pressure applied by the test bench dummy disc to the simulated brake pad 20. Both pressure sensors 40 are electrically connected to an intelligent display controller (not shown in the figure), which can display the pressure values ​​detected by the pressure sensors 40.

[0074] Since the pressure data measured by the pressure sensor 40 needs to be used as standard data for comparison, a pressure sensor 40 with higher measurement accuracy and smaller error should be selected.

[0075] According to one embodiment of the present utility model, Figure 3 As shown, the length calibration unit is a grating caliper 50, and the measurement accuracy and display accuracy of the grating caliper 50 are both less than or equal to 0.01 mm. The grating caliper 50 has a high measurement accuracy and can accurately reflect and record the distance between the two simulated gate plates 20 on the calibration device.

[0076] The grating caliper 50 has a fixed end (caliper body) and a movable end (positioning slider slidably set on the caliper body), the fixed end is connected to the side wall of one simulated brake pad 20, and the movable end is connected to the side wall of another simulated brake pad 20. When the two simulated brake pads 20 approach or move away from each other, the movable end and the moving end of the grating caliper 50 also approach or move away from each other, and the readings on the grating caliper 50 also change accordingly. Since the grating caliper 50 and the simulated brake pad 20 are in a follow-up process, the relief gap S of the simulated brake pad 20 during the simulated relief release can be obtained according to the changes in the readings on the grating caliper 50. Among them, the grating caliper 50 is a conventional length measuring tool in the prior art, and its specific structure and measurement principle are not described here.

[0077] According to one embodiment of the present utility model, Figure 4 and Figure 5As shown, the calibration device also includes a connecting member 60 , which has a first connecting portion 61 and a second connecting portion 62 , wherein the first connecting portion 61 is connected to the brake caliper unit relief clearance test bench 80 , and the second connecting portion 62 is connected to the connecting shaft 10 .

[0078] The connecting member 60 can fix the calibration device on the brake caliper unit relief clearance test bench 80 , thereby simulating the test process of the brake caliper unit 72 .

[0079] Specifically, the connecting member 60 is formed by bending a steel pipe with a rectangular cross-section, and one end of its upper part forms a first connecting portion 61. The first connecting portion 61 cooperates with the corresponding pin holes of the test bench through two load-bearing pins to realize the hanging installation of the calibration device; one end of the lower part of the connecting member 60 forms a second connecting portion 62, and the second connecting portion 62 is fixedly connected to the middle position of the connecting shaft 10, so that the two simulated brake pads 20 are symmetrically arranged relative to the connecting member 60.

[0080] In this embodiment, the connecting shaft 10 located at the upper part of the calibration device passes through the second connecting part 62 and is welded to the second connecting part 62 . The connecting shaft 10 can neither move axially nor rotate circumferentially relative to the connecting member 60 .

[0081] Further, such as Figure 5 As shown, the connecting member 60 further has a third connecting portion 63 , and the adjusting screw 30 is rotatably inserted into the third connecting portion 63 .

[0082] The provision of the third connection portion 63 can improve the connection strength between the calibration device and the brake caliper unit relief gap test bench 80, and avoid the calibration device from falling off due to failure of the connection structure during the calibration process.

[0083] Specifically, Figure 3 As shown, the middle part of the connecting member 60 extends downward to form a third connecting portion 63, on which a locking nut is provided, and the adjusting screw 30 is inserted into the locking nut. The adjusting nut allows the adjusting screw 30 to rotate only in the circumferential direction and not to move left and right.

[0084] According to one embodiment of the present utility model, Figure 3 and Figure 5 As shown, a first connecting hole is respectively opened at the relative position of the two simulated brake pads 20 , and a linear bearing 11 is arranged in each of the two first connecting holes. Both ends of the connecting shaft 10 are respectively passed through the two linear bearings 11 .

[0085] Specifically, Figure 3Taking one of the connecting shafts 10 as an example, two corresponding first connecting holes are opened at the corresponding positions of the two simulated gate pads 20, and the two first connecting holes are for the two ends of the connecting shaft 10 to pass through; linear bearings 11 are fixed in the two first connecting holes, and the two ends of the connecting shaft 10 are passed through the corresponding linear bearings 11, thereby realizing the sliding connection between the connecting shaft 10 and the simulated gate pad 20.

[0086] According to one embodiment of the present utility model, Figure 3 As shown, a second connecting hole is respectively opened at the relative position of the two simulated brake pads 20, and a first nut and a second nut are respectively arranged in the two second connecting holes. The two ends of the adjustment screw 30 respectively have a first threaded portion and a second threaded portion with opposite rotation directions, and the first threaded portion and the second threaded portion are respectively threadedly connected to the first nut and the second nut.

[0087] Specifically, in this embodiment, a second connecting hole is respectively opened at the corresponding position of the two simulated brake pads 20, and the two second connecting holes are used for the two ends of the adjustment screw 30 to pass through; Figure 5 As shown, the two first connection holes and one second connection hole on the same simulated brake pad 20 are distributed in a triangular shape, so that the two parallel connection shafts 10 and an adjustment screw 30 also form a triangular structure in space, thereby enhancing the structural strength of the calibration device. The first nut and the second nut are respectively fixed in the two second connection holes, wherein the thread in the first nut is left-handed and the thread in the second nut is right-handed; the two ends of the adjustment screw 30 are respectively processed to form a first left-handed thread segment and a second right-handed thread segment, the first thread segment is threadedly connected in the first nut, and the second thread segment is threadedly connected in the second nut. When the adjustment screw 30 is rotated, due to the opposite direction of the thread rotation, the first nut and the second nut can move closer to or farther from each other, thereby driving the two simulated brake pads 20 to move closer to or farther from each other.

[0088] Preferably, the threads on the first nut, the second nut, the first threaded portion and the second threaded portion are all trapezoidal threads. Since trapezoidal threads have advantages such as good processability, high root strength and good centering, the transmission effect between the adjustment screw 30 and the simulated brake pad 20 is better.

[0089] Further, such as Figure 3 and Figure 5 As shown, one end of the adjustment screw 30 passes through the simulated brake pad 20 and is connected to a rotating hand wheel 31. The setting of the rotating hand wheel 31 can facilitate the tester to adjust the distance between the two simulated brake pads 20.

[0090] Since the relief gap S measured by the grating caliper 50 of the calibration device of the present invention needs to be used as standard data, it is necessary to ensure the accuracy of the measurement data of the grating caliper 50, and accordingly, it is necessary to make corresponding requirements on the processing accuracy and assembly accuracy of each component of the calibration device, as follows:

[0091] The parallelism between the measurement reference line of the grating caliper 50 and the axis of the connecting shaft 10 needs to be less than 0.05; the installation accuracy of the grating caliper 50 is improved to ensure that the grating caliper 50 can reflect the spacing between the simulated gate pads 20 in real time and truly.

[0092] The coaxiality of the two corresponding first connecting holes on the two simulated brake pads 20 needs to be less than 0.1; the coaxiality of the two corresponding second connecting holes on the two simulated brake pads 20 needs to be less than 0.1; the verticality between the connecting piece 60 and the connecting shaft 10 needs to be less than 0.1.

[0093] The linear bearing 11 disposed in the first connecting hole needs to be a linear bearing 11 with a matching accuracy of 0.01 mm.

[0094] The steps of calibrating the dummy disc opening force using the brake caliper unit relief clearance test bench calibration device of the utility model are as follows:

[0095] Step S1: rotating the adjusting screw 30 to bring the two simulated brake pads 20 closer together and adjusting the simulated brake pads 20 to abut against the test bench dummy disc;

[0096] Step S2: Reset the length calibration unit to zero;

[0097] Step S3: Rotate the adjusting screw 30 in the opposite direction to move the two simulated brake pads 20 away from each other until the length calibration unit displays a preset distance;

[0098] Step S4: operate the dummy disc opening mechanism to open the dummy disc of the test bench, and after the system is stable, record the displayed value of the force calibration unit;

[0099] Step S5: Compare the displayed value with the opening force obtained by theoretical calculation to calibrate the opening force of the fake disc.

[0100] The dummy disc opening force calibration method described in the utility model simulates the process of the dummy disc opening the gate plate 71, compares the obtained display value with the theoretically calculated opening force, and then determines whether the opening force provided by the test bench dummy disc is accurate.

[0101] Specifically, in step S1, the calibration device is first fixed to the test bench through the connecting piece 60. At this time, the test bench dummy disc is located between the two simulated brake pads 20. The two simulated brake pads 20 are brought closer to each other by turning the handle and rotating the adjusting screw 30 clockwise until they are in contact with the test bench dummy disc. At this time, almost no force is generated between the simulated brake pads 20 and the test bench dummy disc. The reading of the intelligent display controller connected to the pressure sensor 40 needs to be kept within 5N. If the reading exceeds 5N, it means that the adjustment is over-adjusted. At this time, the adjusting screw 30 needs to be rotated counterclockwise for fine-tuning to reduce the force between the simulated brake pads 20 and the test bench dummy disc.

[0102] In step S2, after completing step S1, the grating caliper 50 is reset to zero. The zeroing operation can facilitate subsequent readings. The reading displayed by the grating caliper 50 after zeroing is the change in displacement between the simulated gate plates 20, and no calculation is required in the subsequent process. Of course, the zeroing operation may not be performed, but the reading of the grating caliper 50 at this time needs to be recorded. In fact, the zeroing operation is to set the reading of the grating caliper 50 in this state to zero, thereby reducing the process of recording the reading in the early stage and the process of subsequent calculation.

[0103] In step S3, after completing step S2, the handle is turned counterclockwise to rotate the adjustment screw 30 to move the two simulated brake pads 20 away from each other until a preset distance is displayed on the grating caliper 50; the preset distance is usually the width of the relief gap S of the brake caliper unit 72. In this embodiment, the preset distance is 3 mm. The above adjustment to the reading on the grating caliper 50 of 3 mm is for the zeroing operation performed in step S2; for the case where the zeroing operation is not performed in step S2 but the initial reading of the grating caliper 50 is recorded, if the recorded initial reading is X, then in step S3, it is necessary to adjust until the reading on the grating caliper 50 is (X+3) mm.

[0104] In step S4, the dummy disc opening mechanism on the test bench is started, which can output a fixed force value to open the dummy disc of the test bench. After the dummy disc of the test bench is opened, it will exert pressure on the simulated brake pads 20 on both sides thereof. After the system is stable, the reading of the intelligent display controller connected to the pressure sensor 40 is recorded;

[0105] In step S5, the false disc propping mechanism on the test bench can output a fixed force value, that is, the false disc on the test bench can provide a fixed force value to the simulated brake pad 20. The force is usually provided by a hydraulic cylinder, and the magnitude of the force value is obtained by theoretical calculation. Therefore, whether there is a deviation between the actual output value of the force value and the theoretical calculated value, a corresponding test needs to be performed. The reading of the intelligent display controller in step S4 is the actual output value. By comparing the actual output value with the theoretical calculated value, it is determined that the false disc propping mechanism on the test bench can actually provide the required force value; if the deviation between the two is large, the test bench needs to be re-debugged so that the error between the actual output value of the false disc propping mechanism and the theoretical calculated value is maintained within a reasonable range.

[0106] The steps of using the brake caliper unit relief clearance test bench calibration device of the utility model to calibrate the relief clearance are as follows:

[0107] Step S01: rotating the adjusting screw 30 to adjust the distance between the two simulated brake pads 20 to be consistent with the thickness of the test bench dummy disc;

[0108] Step S02: Reset the length calibration unit to zero and record the displacement value A0 on the test bench program interface;

[0109] Step S03: rotating the adjusting screw 30 to adjust the distance between the two simulated brake pads 20, and recording the displacement values ​​A1 to An corresponding to the test bench program interface when the displacement values ​​displayed by the length calibration unit are B1 to Bn;

[0110] Step S04: Compare Bn with (An-A0) to calibrate the relief gap S;

[0111] Here, n is a natural number greater than or equal to 2.

[0112] The relief gap calibration method described in the utility model simulates the relief gap S test process, compares the obtained standard displacement value (Bn) with the displacement value (An-A0) displayed on the test bench, and then determines whether the displacement value displayed on the test bench is accurate.

[0113] Specifically, in step S01, the calibration device is first fixed to the test bench through the connecting piece 60. At this time, the test bench dummy disc is located between the two simulated brake pads 20. The two simulated brake pads 20 are brought closer to each other by turning the handle and rotating the adjusting screw 30 clockwise until they contact the test bench dummy disc, that is, the distance between the two simulated brake pads 20 is adjusted to be consistent with the thickness of the test bench dummy disc.

[0114] In step S02, after completing step S01, the grating caliper 50 is reset to zero, which can facilitate subsequent readings; at the same time, the displacement value A0 of the test bench program interface is recorded. The displacement value A0 is the initial distance between the simulated gate pad 20 and the test bench dummy disk measured by the laser displacement sensor provided on the test bench dummy disk.

[0115] In step S03, after completing step S02, the adjustment screw 30 is rotated counterclockwise by turning the handle to move the two simulated brake pads 20 away from each other. During the rotation, the displacement values ​​A1 to An corresponding to the test bench program interface are recorded when the displacement values ​​displayed by the grating caliper 50 are B1, B2 to Bn; in this embodiment, n is 3, and B1, B2, and B3 are 2 mm, 4 mm, and 6 mm, respectively.

[0116] In step S04, the test bench obtains the relief clearance of the brake caliper unit 72 after relief release through the laser displacement sensor set on the test bench dummy disc, and whether the relief clearance (An-A0) is accurate needs to be tested. Bn in step S03 is the actual value of the simulated relief clearance (obtained by the grating caliper 50), which is compared with the measured value (An-A0) read on the test bench in the corresponding state to determine whether the measurement result of the relief clearance measurement mechanism (laser displacement sensor and corresponding components) in the test is accurate. If the deviation between the two is large, the test bench needs to be re-debugged to maintain the error between the measured value and the actual value of the relief clearance measurement mechanism within a reasonable range.

[0117] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only a specific embodiment of the utility model and is not intended to limit the scope of protection of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the scope of protection of the utility model.

Claims

1. A brake caliper unit relief clearance test bench calibration device, It is characterized in that include: Connecting shaft; Two simulated brake pads are arranged opposite to each other, and are slidably connected to the connecting shaft along the axis direction of the connecting shaft; An adjusting screw, threadedly connected between the two simulated brake pads to drive the two simulated brake pads to move closer to or away from each other; A force calibration unit is provided on two inner sides of the two simulated brake pads facing each other to obtain the pressure exerted on the simulated brake pads; The length calibration unit is connected between the two simulated brake pads to obtain the distance between the two simulated brake pads.

2. The brake caliper unit relief clearance test bench calibration device according to claim 1, It is characterized in that The force calibration unit has two pressure sensors, and the two pressure sensors are respectively arranged on two inner side surfaces of the two simulated brake pads facing each other.

3. The brake caliper unit relief clearance test bench calibration device according to claim 1 or 2, It is characterized in that The length calibration unit is a grating caliper, and the measurement accuracy and display accuracy of the grating caliper are both less than or equal to 0.01 mm.

4. The brake caliper unit relief clearance test bench calibration device according to claim 1, It is characterized in that At least two connecting shafts are connected between the two simulated brake pads, and at least two connecting shafts are arranged parallel to each other.

5. The brake caliper unit relief clearance test bench calibration device according to claim 1, It is characterized in that The test bench calibration device also includes a connecting member, which has a first connecting portion and a second connecting portion, wherein the first connecting portion is connected to the brake caliper unit relief clearance test bench, and the second connecting portion is connected to the connecting shaft.

6. The brake caliper unit relief clearance test bench calibration device according to claim 5, It is characterized in that The connecting member also has a third connecting portion, and the adjusting screw is rotatably inserted into the third connecting portion.

7. The brake caliper unit relief clearance test bench calibration device according to claim 1, It is characterized in that A first connecting hole is respectively opened at the relative position of the two simulated brake pads, and linear bearings are respectively arranged in the two first connecting holes, and the two ends of the connecting shaft are respectively penetrated in the two linear bearings.

8. The brake caliper unit relief clearance test bench calibration device according to claim 1, It is characterized in that A second connecting hole is respectively opened at the relative position of the two simulated brake pads, and a first nut and a second nut are respectively arranged in the two second connecting holes. The two ends of the adjustment screw respectively have a first threaded portion and a second threaded portion with opposite rotation directions, and the first threaded portion and the second threaded portion are respectively threadedly connected to the first nut and the second nut.

9. The brake caliper unit relief clearance test bench calibration device according to claim 8, It is characterized in that The threads on the first nut, the second nut, the first threaded portion and the second threaded portion are all trapezoidal threads.

10. The brake caliper unit relief clearance test bench calibration device according to claim 1 or 8, It is characterized in that One end of the adjusting screw passes through the simulated brake piece and is connected to a rotating hand wheel.

11. The brake caliper unit relief clearance test bench calibration device according to claim 3, It is characterized in that The parallelism between the measurement reference line of the grating caliper and the axis of the connecting shaft is less than 0.05.

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