A non-contact measuring device for brake disc thickness difference for inertial test bench

Abstract

The invention provides a non-contact measuring device for the thickness difference of a brake disc for an inertial test bench, comprising a base, a guide column, a cantilever and a sensor assembly; the guide column comprises a column, a spherical pressure cover, a spherical seat and a lifting structure, the column is a lower end ball head placed on the concave surface of the spherical seat, the spherical pressure cover and the spherical seat are detachably connected; the sleeve on the lifting structure is placed on the spline shaft and is pressed by a tightening handle, a T-shaped groove parallel to the friction surface of the brake disc is opened on the base, and the T-shaped block is fixedly connected to the bottom of the spherical seat; the cantilever comprises a swing arm mounting shaft and two swing arms symmetrical along the brake disc, the middle part of the swing arm mounting shaft is located in the mounting hole of the lifting structure and is pressed and fixed by bolts, and the swing arm is fixedly connected to both ends of the swing arm mounting shaft; the sensor assembly is fixedly connected to the swing arm; the base is fixedly connected to the working table of the testing machine, and can realize multi-angle and multi-directional DTV testing of the brake pair under complex working conditions such as different contact angles, and the measurement result is accurate and easy to promote.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile testing, and in particular relates to a non-contact measuring device for thickness difference of a brake disc used for an inertial test bench. Background Art

[0002] Brake judder is a fault that is more likely to occur during driving. It not only reduces the comfort of the vehicle, but also aggravates the aging of other parts of the vehicle, affecting the fatigue durability and safety of the entire vehicle.

[0003] Research shows that the jitter of a vehicle during braking is mainly caused by the thickness variation of the brake disc, referred to as DTV (Disc Thickness Variation). Since the vehicle test is not only limited by factors such as road climate and personnel, but also the brake pressure and starting temperature are difficult to control, the braking torque, instantaneous disc bounce and temperature change are difficult to measure. Therefore, testing and analyzing DTV in a laboratory environment using a vehicle brake inertia bench is the best way to study brake jitter.

[0004] Inertial test bench DTV measurement mostly uses non-contact displacement sensors. According to the DTV test standard requirements, the positions of three points from the outside to the inside on both sides of the brake disc are usually measured to measure the displacement changes of the outer diameter, middle diameter, and inner diameter. However, traditional inertial test bench DTV measurement devices are only suitable for routine tests under ordinary working conditions, and cannot realize multi-angle and multi-directional DTV tests of brake pairs under complex simulated working conditions such as different contact angles. Summary of the invention

[0005] The purpose of the present invention is to provide a non-contact measuring device for the thickness difference of a brake disc for an inertial test bench, which can perform multi-angle and multi-directional tests on brake discs of different models to solve the shortcomings of the current technology.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] A non-contact measuring device for thickness difference of a brake disc for an inertial test bench, comprising a base, a guide column, a cantilever and a sensor assembly;

[0008] The guide column comprises a column 4, a spherical gland 5, a spherical seat 3 and a lifting structure 6. The column 4 is a spline shaft with a ball head at the lower end. The ball head is placed on the concave surface of the spherical seat 3. There is a gap between the spherical gland 5 and the ball head. The spherical gland 5 and the spherical seat 3 are detachably connected.

[0009] The inner spline hole on the lifting structure 6 is sleeved on the spline shaft and is pressed by the tightening handle 7. The base is provided with a T-shaped slot 1 parallel to the friction surface of the brake disc. The T-shaped block 2 located in the T-shaped slot 1 is fixedly connected to the bottom of the spherical seat 3.

[0010] The cantilever includes a swing arm mounting shaft 8 and two swing arms 9 symmetrically arranged along the brake disc. The middle portion of the swing arm mounting shaft 8 is located in the mounting hole of the lifting structure 6 and is fixed by bolts. The swing arms 9 are fixedly connected to both ends of the swing arm mounting shaft 8. The swing arms 9 and the spline shaft are located on the same plane.

[0011] The sensor assembly is fixedly connected to the swing arm;

[0012] The base is fixedly connected to the working table of the testing machine.

[0013] As a better technical solution of the present invention, the sensor assembly includes a sensor seat 10, an insulating sleeve 11, and a sensor 12. The insulating sleeve 11 is wrapped around the outer surface of the sensor 12. The sensor 12 is installed in the hole of the sensor seat 10. The sensor seat 10 is fixedly connected to the swing arm 9.

[0014] As a more optimal technical solution of the present invention, the base is fixed to the testing machine by bolts, and the bolt holes on the base are oblong holes, and the long diameter thereof is perpendicular to the friction surface of the brake disc.

[0015] As a more optimal technical solution of the present invention, the insulating sleeve 11 is made of high temperature resistant insulating material.

[0016] As a more optimal technical solution of the present invention, the sensor 12 is a capacitive non-contact displacement sensor.

[0017] As a more optimal technical solution of the present invention, the external thread end of the tightening handle 7 is screwed into the threaded hole on the side wall of the lifting structure 6 and abuts against the spline shaft.

[0018] The beneficial effects are as follows:

[0019] The non-contact measuring device for brake disc thickness difference provided by the present invention adopts a non-contact measurement method, performs multi-angle and multi-directional tests on brake discs of different models, and can realize DTV testing of brake pairs under different contact angle conditions; it has the advantages of accurate measurement results, stable and reliable, convenient use, compact structure, wide application range, low cost and easy promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of the non-contact measuring device for brake disc thickness difference according to the present invention;

[0021] Figure 2 It is a left side view of the non-contact measuring device for brake disc thickness difference of the present invention;

[0022] Figure 3 A top view of the non-contact measuring device for brake disc thickness difference according to the present invention;

[0023] Figure 4 It is a diagram showing the non-contact measuring device for the thickness difference of a brake disc according to the present invention performing DTV tests in different positions;

[0024] Figure 5 It is a diagram showing the non-contact measuring device for the thickness difference of a brake disc according to the present invention performing DTV tests in different positions;

[0025] Figure 6 This is a diagram of the non-contact measuring device for thickness difference of brake discs according to the present invention performing a DTV test on a brake disc of a larger size;

[0026] Figure 7 This is a diagram showing the DTV test of a smaller brake disc by the non-contact measuring device for thickness difference of the brake disc of the present invention;

[0027] Figure 8 It is a DTV test diagram of the brake pair of the non-contact measuring device for the thickness difference of the brake disc of the present invention under different contact angle conditions;

[0028] Fig. 9 It is a DTV test diagram of the brake pair of the non-contact measuring device for the thickness difference of the brake disc of the present invention under different contact angle conditions;

[0029] Fig.10 This is a schematic diagram of the DTV test principle of the non-contact measuring device for the thickness difference of the brake disc according to the present invention;

[0030] The following are marked in the figure:

[0031] 1-T-slot base, 2-T-block, 3-spherical seat, 4-column,

[0032] 5-spherical gland, 6-lifting structure, 7-tightening handle, 8-swing arm mounting shaft,

[0033] 9-swing arm, 10-sensor seat, 11-insulating sleeve, 12-sensor. DETAILED DESCRIPTION

[0034] To further illustrate the technical solution of the present invention, in conjunction with the accompanying drawings, the specific implementation of the present invention is as follows:

[0035] like Figure 1 , Figure 2 and Figure 3As shown, the present invention provides a non-contact measuring device for the thickness difference of a brake disc for an inertial test bench, comprising a base, a guide column, a cantilever and a sensor assembly; the guide column comprises a column 4, a spherical pressure cover 5, a spherical seat 3 and a lifting structure 6, the column 4 is a spline shaft with a ball head at the lower end, the ball head is placed on the concave surface of the spherical seat 3, there is a gap between the spherical pressure cover 5 and the ball head, and the spherical pressure cover 5 and the spherical seat 3 are detachably connected; the inner spline hole on the lifting structure 6 is sleeved on the spline shaft and is tightened by a tightening handle 7, the base A T-shaped slot 1 parallel to the friction surface of the brake disc is opened on it, and a T-block 2 located in the T-shaped slot 1 is fixedly connected to the bottom of the spherical seat 3; the cantilever includes a swing arm mounting shaft 8 and two swing arms 9 symmetrical along the brake disc, the middle part of the swing arm mounting shaft 8 is located in the mounting hole of the lifting structure 6 and is fixed by bolts, and the swing arm 9 is fixedly connected to both ends of the swing arm mounting shaft 8; the swing arm 9 and the spline shaft are located on the same plane; the sensor assembly is fixedly connected to the swing arm; the base is fixedly connected to the workbench of the testing machine.

[0036] In some embodiments, the sensor assembly includes a sensor seat 10, an insulating sleeve 11, and a sensor 12, wherein the insulating sleeve 11 is wrapped around the outer surface of the sensor 12, the sensor 12 is installed in the hole of the sensor seat 10, and the sensor seat 10 is fixedly connected to the swing arm 9.

[0037] In some embodiments, the base is fixed to the testing machine by bolts, and the bolt holes on the base are oblong holes, and the long diameter of the holes is perpendicular to the friction surface of the brake disc.

[0038] In some embodiments, the insulating sleeve 11 is made of high temperature resistant insulating material.

[0039] In some embodiments, the sensor 12 is a capacitive non-contact displacement sensor.

[0040] In some embodiments, the external threaded end of the tightening handle 7 is screwed into a threaded hole on the side wall of the lifting structure 6 and abuts against the spline shaft.

[0041] In some embodiments, the main body of the column 4 is a hexagonal body, and the lifting structure 6 is processed with round holes and hexagonal through holes, which is mounted on the column 4 and can be adjusted along the column rod direction on the column 4 and fixed in position by a tightening handle 7.

[0042] The symmetric centers of the two T-slots 1 on the base of the non-contact measuring device for the thickness difference of the brake disc of the present invention are aligned with the centers of the two friction surfaces of the brake disc to be measured. After adjusting to a suitable position, the base is fastened to the work table of the inertia bench test machine with screws. The bolt hole of the T-slot 1 is an oblong hole. When replacing different brake discs, the base can adjust the position along the axial direction of the oblong hole. The T-block 2 is inserted into the T-slot 1 on the base, and the spherical seat 3 is fixedly installed on the T-block 2. The bolts fasten the spherical seat 3 to the T-block 2. There are gaps between the ball head and the spherical seat 3 and the spherical pressure cover 5. The spherical seat 3 can adjust the position in the direction of the T-slot 1, and the spherical seat 3 is processed with a concave spherical surface.

[0043] like Figure 1 , Figure 2 and Figure 3 As shown, the guide column is mainly composed of a column 4, a spherical pressure cover 5, a lifting structure 6, and a tightening handle 7; the bottom of the column 4 is a sphere, and the main body is a hexagonal body, which is installed in the concave spherical surface of the spherical seat 3, and the spherical cover plate 5 is processed with a concave spherical surface, and the concave spherical surface contacts and cooperates with the sphere at the bottom of the column 4. The spherical cover plate 5 is fastened to the spherical seat 3 by bolts, and a gap is left between the spherical cover plate 5 and the spherical seat 3. The column 4 can be adjusted at multiple angles through the bottom sphere, and the lifting structure 6 is processed with round holes and hexagonal through holes, which is mounted on the column 4, and the position can be adjusted along the column rod direction on the column 4, and the position is fixed by the tightening handle 7.

[0044] The cantilever is mainly composed of a swing arm mounting shaft 8 and a swing arm 9. The swing arm mounting shaft 8 is mounted on the lifting structure 6 and is locked with a set screw after adjusting the position. A round hole is processed at one end of the swing arm 9 and the other end is a hexagonal body. The swing arm 9 is mounted on the swing arm mounting shaft 8 and can move axially along the swing arm mounting shaft 8 and can rotate radially along the swing arm mounting shaft 8. Its position is adjusted according to the thickness of the brake disc and its angle is adjusted according to the measurement orientation. It is locked with a set screw. The sensor seat 10 is processed with a round hole and a hexagonal through hole. The sensor seat 10 is sleeved on the swing arm 9 and can adjust its position along the swing arm rod direction on the swing arm 9. It is locked with a set screw after adjusting the position. The insulating sleeve 11 is a high temperature resistant insulating material and is wrapped around the outer circle of the sensor 12. The sensor 12 is a capacitive non-contact displacement sensor and is installed in the hole of the sensor seat 10. The distance between the sensor 12 and the friction surface of the brake disc is adjusted and the sensor 12 is fastened with a locking screw. By adjusting the position of the sensor seat 10, the spacing of the sensors 12 can be adjusted. The rocker arm 9 is perpendicular to the spline shaft, and the T-slot 1 is parallel to the friction surface of the brake disc.

[0045] like Figure 4 , Figure 5 As shown in the figure, by adjusting the base, guide column and cantilever, DTV test can be performed at different angles and orientations of the brake disc; Figure 6As shown in the figure, by adjusting the base, guide column and cantilever, DTV testing of larger brake discs can be achieved; Figure 7 As shown in the figure, by adjusting the base, guide column and cantilever, DTV testing of smaller brake discs can be achieved; Figure 8 , Fig. 9 As shown, by adjusting the base, guide column and cantilever, DTV test of the brake pair under different contact angle conditions can be achieved.

[0046] The technical indicators and test principles are shown in Table 1.

[0047] Table 1

[0048] Measurement method: Contactless Number of measurement channels: 6 Maximum measuring distance: 2.5mm Resolution (accuracy): + / -0.0005mm Operating temperature range: -30～650℃

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made to the present invention shall be included in the protection scope of the present invention.

[0050] In the description of the present invention, it is necessary to understand that the terms "center", "longitudinal", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0051] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0053] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A non-contact measuring device for the thickness difference of brake discs for inertial test benches. Features: Includes a base, a guide post, a cantilever and a sensor assembly; The guide column comprises a column (4), a spherical pressure cover (5), a spherical seat (3) and a lifting block (6); the column (4) is a spline shaft with a ball head at the lower end; the ball head is placed on the concave surface of the spherical seat (3); there is a gap between the spherical pressure cover (5) and the ball head; the spherical pressure cover (5) and the spherical seat (3) are detachably connected; The inner spline hole on the lifting block (6) is sleeved on the spline shaft and is tightened by a tightening handle (7). The base is provided with a T-shaped groove (1) parallel to the friction surface of the brake disc. The T-shaped block (2) located in the T-shaped groove (1) is fixedly connected to the bottom of the spherical seat (3). The cantilever comprises a swing arm mounting shaft (8) and two swing arms (9) symmetrically arranged along the brake disc, the middle portion of the swing arm mounting shaft (8) being located in the mounting hole of the lifting block (6) and being fixed by bolts, and the swing arm (9) being fixedly connected to both ends of the swing arm mounting shaft (8); the swing arm (9) and the spline shaft being located on the same plane; The sensor assembly is fixedly connected to the swing arm (9); The base is fixedly connected to the working table of the testing machine.

2. A non-contact measuring device for thickness difference of brake disc for inertial platform as claimed in claim 1, Features: The sensor assembly comprises a sensor seat (10), an insulating sleeve (11), and a sensor (12); the insulating sleeve (11) is wrapped around the outer surface of the sensor (12); the sensor (12) is installed in a hole of the sensor seat (10); and the sensor seat (10) is fixedly connected to the swing arm (9).

3. A non-contact measuring device for thickness difference of brake disc for inertial platform as claimed in claim 1, Features: The base is fixed on the testing machine by bolts, and the bolt holes on the base are oblong holes, and the long diameter of the holes is perpendicular to the friction surface of the brake disc.

4. A non-contact measuring device for thickness difference of brake disc for inertial platform as claimed in claim 1, Features: The insulating sleeve (11) is made of high temperature resistant insulating material.

5. A non-contact measuring device for thickness difference of brake disc for inertial platform as claimed in claim 1, Features: The sensor (12) is a capacitive non-contact displacement sensor.

6. A non-contact measuring device for thickness difference of brake disc for inertial platform as claimed in claim 1, Features: The external thread end of the tightening handle (7) is screwed into the threaded hole on the side wall of the lifting block (6) and abuts against the spline shaft.

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