Automobile brake NVH and braking performance comprehensive test system

Abstract

The application relates to the technical field of automobile brake testing, and discloses a kind of automobile brake NVH and braking performance comprehensive test system, wherein, environmental cabin is internally provided with mounting mechanism, and the mounting mechanism is used for installing automobile brake;Power cabin is internally provided with transmission shaft, inertia mechanism and power mechanism, one end of transmission shaft extends into environmental cabin and is used for being detachably connected with the brake disc of automobile brake, inertia mechanism is used for adjusting the rotational inertia of transmission shaft, and power mechanism is used for driving transmission shaft to rotate and can adjust the torque and rotating speed of transmission shaft;The environment control mechanism can simulate a variety of working condition environments of automobile brake in the environmental cabin, the application can accurately simulate wide temperature, wide humidity range brake working condition, realize the comprehensive test of braking performance, NVH characteristic and environmental adaptability.

Description

Technical Field

[0001] This invention relates to the field of automotive brake testing technology, and in particular to a comprehensive testing system for automotive brake NVH and braking performance. Background Technology

[0002] Automotive brakes are devices that slow down or stop moving mechanical parts. They are important functional components of automobiles and play a vital role in driving safety. Therefore, it is necessary to test and inspect the relevant performance indicators of automotive brake calipers.

[0003] Existing automotive brake testing technologies suffer from problems such as low torque testing accuracy, large deviations in brake pressure loading, and a lack of capability in controlling environmental temperature and humidity at low temperatures and high humidity levels. These issues make it difficult to meet diverse testing needs and urgently require improvement. These problems lead to significant deviations in automotive brake performance test results, failing to accurately reflect the brake's working condition under real-world complex road conditions, and seriously affecting the research, optimization, and quality control of automotive braking systems. Summary of the Invention

[0004] The purpose of this invention is to provide a comprehensive testing system for NVH and braking performance of automotive brakes, aiming to solve or improve at least one of the above-mentioned technical problems.

[0005] To achieve the above objectives, the present invention provides the following solution: The present invention provides a comprehensive testing system for NVH and braking performance of automotive brakes, comprising:

[0006] An environmental chamber, with an installation mechanism inside, is used to install automotive brakes;

[0007] The power compartment contains a drive shaft, an inertia mechanism, and a power mechanism. One end of the drive shaft extends into the environmental chamber and is detachably connected to the brake disc of the vehicle's brake system. The inertia mechanism is used to adjust the rotational inertia of the drive shaft, and the power mechanism is used to drive the drive shaft to rotate and can adjust the torque and speed of the drive shaft.

[0008] The environmental control mechanism enables the environmental chamber to simulate various operating conditions of the vehicle's brakes.

[0009] Optionally, the inertia mechanism includes:

[0010] The first inertia disk is coaxial with and detachably connected to the drive shaft;

[0011] Multiple second inertia disks are coaxially arranged with the first inertia disk, and two adjacent second inertia disks are detachably connected to each other. The second inertia disk closest to the first inertia disk is detachably connected to the first inertia disk.

[0012] Optionally, the inertia mechanism further includes:

[0013] A clamping device is slidably disposed above the first inertia disk and a plurality of second inertia disks, the clamping device being capable of clamping and fixing the second inertia disks;

[0014] The first sliding device is used to drive the clamping device to slide along the axial direction of the transmission shaft.

[0015] Optionally, a coaxial tapered assembly is fixedly connected to the drive shaft, and the axis of the second inertia disk has a tapered mounting hole, which can be inserted into the assembly.

[0016] Optionally, the first inertia disk and the second inertia disk, as well as two adjacent second inertia disks, are detachably connected by bolts.

[0017] Optionally, the power mechanism includes:

[0018] A dual-output-shaft motor, wherein one of the output shafts is connected to the drive shaft.

[0019] The geared motor has its output shaft connected to the other output shaft of the dual-output-shaft motor via a clutch.

[0020] Optionally, the mounting mechanism includes:

[0021] A connecting frame is slidably disposed within the environmental chamber, and the connecting frame is provided with a mounting position for installing the vehicle brake;

[0022] The second sliding device is used to drive the connecting frame to slide along the axial direction of the transmission shaft.

[0023] Optionally, the drive shaft and the vehicle brake are connected via a universal joint.

[0024] Optionally, the sidewalls of the environmental chamber are provided with soundproof partitions.

[0025] Optionally, a braking mechanism is also provided in the power compartment, which is used to drive the calipers of the vehicle brakes.

[0026] This invention discloses the following technical effects: The automotive brake is mounted on a mounting mechanism and connected to a drive shaft. The rotational inertia of the drive shaft is adjusted via an inertia mechanism to simulate different wheel loads, achieving accurate road load simulation. A wide range of inertia simulation is achieved by adjusting the torque and speed of the drive shaft via a power mechanism. Environmental control mechanisms simulate high and low temperatures, humidity, and other environmental conditions, enabling precise temperature and humidity control within the environmental chamber to meet extreme operating condition testing requirements. The coordinated operation of the inertia mechanism, power mechanism, and environmental control mechanism precisely simulates braking conditions across a wide temperature and humidity range, achieving comprehensive testing of braking performance, NVH characteristics, and environmental adaptability. Attached Figure Description

[0027] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the installation mechanism structure of the present invention;

[0030] Figure 3 This is a schematic diagram of the internal structure of the transmission compartment of the present invention;

[0031] Figure 4 This is a schematic diagram of the first and second inertia disks of the present invention;

[0032] Figure 5 This is a cross-sectional view of the drive shaft, the first inertia disk, and the second inertia disk of the present invention.

[0033] Figure 6 This is a schematic diagram of the telescopic cylinder and hook structure of the present invention;

[0034] Figure 7 This is a schematic diagram of the connector structure of the present invention.

[0035] In the diagram: 1. Environmental chamber; 2. Installation mechanism; 21. Connecting frame; 22. Installation position; 23. Second sliding device; 3. Power chamber; 4. Drive shaft; 5. Inertia mechanism; 51. First inertia disk; 52. Second inertia disk; 521. Clamping bar; 53. Clamping device; 531. Telescopic cylinder; 532. Hook; 533. Fixing plate; 534. Hanging rod; 535. Clamping plate; 536. Clamping slot; 54. First sliding device; 55. Assembly parts; 56. Assembly hole; 6. Power mechanism; 61. Dual output shaft motor; 62. Gear motor; 63. Clutch; 7. Environmental control mechanism; 8. Universal joint. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] Reference Figures 1-7 This invention provides a comprehensive testing system for NVH and braking performance of automotive brakes, comprising:

[0039] Environmental chamber 1, with an installation mechanism 2 inside, is used to install automotive brakes;

[0040] The power compartment 3 is equipped with a drive shaft 4, an inertia mechanism 5 and a power mechanism 6. One end of the drive shaft 4 extends into the environmental chamber 1 and is used to detachably connect to the brake disc of the vehicle brake. The inertia mechanism 5 is used to adjust the rotational inertia of the drive shaft 4. The power mechanism 6 is used to drive the drive shaft 4 to rotate and can adjust the torque and speed of the drive shaft 4.

[0041] The environmental control mechanism 7 enables the environmental chamber 1 to simulate various working conditions of the car brake, such as extreme environmental conditions such as low temperature and high humidity, low temperature and low humidity, and high temperature and high humidity.

[0042] The vehicle brake is mounted on the mounting mechanism 2 and connected to the drive shaft 4. The rotational inertia of the drive shaft 4 is adjusted by the inertia mechanism 5 to simulate different wheel loads, achieving accurate road load simulation. The torque of the drive shaft 4 is adjusted by the power mechanism 6 to achieve a wide range of inertia simulation. The environmental control mechanism 7 simulates environmental conditions such as high and low temperatures and humidity, achieving precise control of the temperature and humidity of the test environment in the environmental chamber 1 to meet the requirements of extreme working conditions testing. The cooperation of the inertia mechanism 5, the power mechanism 6 and the environmental control mechanism 7 accurately simulates braking conditions in a wide range of temperatures and humidity, achieving comprehensive testing of braking performance, NVH characteristics and environmental adaptability.

[0043] In one embodiment of the present invention, the inertia mechanism 5 includes:

[0044] The first inertia disk 51 is coaxial with the drive shaft 4 and detachably connected;

[0045] Multiple second inertia disks 52 are coaxially arranged with the first inertia disk 51. Two adjacent second inertia disks 52 are detachably connected, and the second inertia disk 52 closer to the first inertia disk 51 is detachably connected to the first inertia disk 51.

[0046] The rotational inertia on the drive shaft 4 can be adjusted by adjusting the number of second inertia disks 52 connected to the first inertia disk 51.

[0047] In one embodiment of the present invention, the inertia mechanism 5 further includes:

[0048] The clamping device 53 is slidably disposed above the first inertia disk 51 and the plurality of second inertia disks 52, and the clamping device 53 can clamp and fix the second inertia disks 52.

[0049] The first sliding device 54 is used to drive the clamping device 53 to slide along the axial direction of the transmission shaft 4.

[0050] After the second inertia disk 52 is clamped and fixed by the clamping device 53, the clamping device 53 can be driven by the first sliding device 54 to move the second inertia disk 52, thereby adjusting the position of the second inertia disk 52 and realizing the assembly assistance of the second inertia disk 52.

[0051] Furthermore, the clamping device 53 includes:

[0052] The telescopic cylinder 531 is slidably mounted on the first sliding device 54, and the output end of the telescopic cylinder 531 is provided with a hook 532;

[0053] The connector includes a fixed plate 533, on which a hanging rod 534 is mounted for connection to a hook 532. A retaining plate 535 is detachably connected to the fixed plate 533 by bolts. Both the fixed plate 533 and the retaining plate 535 have notches forming a retaining groove 536. A retaining strip 521 is circumferentially arranged on the outer edge of the second inertia disk 52, which engages with the retaining groove 536. By assembling the connector onto the second inertia disk 52 and connecting it to the hanging rod 534 via the hook 532, the first sliding device 54 drives the telescopic cylinder 531 to move, thereby adjusting the position of the second inertia disk 52.

[0054] Furthermore, a test bench is set up inside the power compartment 3. A pair of split bearing seats for supporting the drive shaft 4 are installed on the test bench, located on both sides of the inertia mechanism 5. The bearing seats have oil injection holes for external oiling and temperature detection holes for installing temperature sensors. Vibration sensors are also installed on the bearing seats. The test bench is equipped with temperature and vibration acquisition channels. By collecting the temperature and vibration signals of the bearing seats, the system can monitor the equipment operation status in conjunction with the equipment operation status monitoring system.

[0055] In one embodiment of the present invention, a coaxial tapered fitting 55 is fixedly connected to the drive shaft 4, and a tapered mounting hole 56 is provided at the center of the second inertia disk 52, which can be inserted into the fitting 55.

[0056] The tapered fitting 55 on the drive shaft 4 engages with the tapered mounting hole 56 on the second inertia disk 52, facilitating rapid positioning of the second inertia disk 52 and the drive shaft 4.

[0057] In one embodiment of the present invention, the first inertia disk 51 and the second inertia disk 52, as well as two adjacent second inertia disks 52, are detachably connected by bolts.

[0058] In one embodiment of the present invention, the power mechanism 6 includes:

[0059] A dual-output-shaft motor 61, one of whose output shafts is connected to the drive shaft 4;

[0060] The output shaft of the geared motor 62 is connected to the other output shaft of the dual-output-shaft motor 61 via a clutch 63.

[0061] The geared motor 62 has a rated torque of 5100 N·m. It can be switched with the dual-output shaft motor 61 via the clutch 63, and supports continuous loading of 3000 N·m for ≥3 hours. It is suitable for static separation of parking brake and creep noise testing.

[0062] Furthermore, the clutch 63 is pneumatic, and the pneumatic drive switches the clutch 63 between engagement and disengagement. It is equipped with a proximity switch sensor to monitor the status of the clutch 63 and feed back to the controller to achieve safety control. When the clutch 63 is engaged, the reduction motor 62 and the dual output shaft motor 61 perform static torque loading. When the clutch 63 is disengaged, the reduction motor 62 does not work. In order to ensure the torque transmission capability of the pneumatic clutch 63, the air pressure needs to meet the operating conditions.

[0063] Furthermore, a cooling fan is also installed in the power compartment 3, integrated on the dual-output shaft motor 61. The cooling fan is connected to the air intake duct of the power compartment 3 to draw air from outside the enclosure to cool the dual-output shaft motor 61. At the same time, the dual-output shaft motor 61 dissipates heat to the enclosure through the motor's heat dissipation port, and the heat is naturally released to the outside of the power compartment 3 through the exhaust port of the power compartment 3. There is a wind speed sensor at the inlet of the cooling fan of the dual-output shaft motor 61.

[0064] The dual-output shaft motor 61 has its own encoder, and a shaft speed sensor and a torque flange sensor are installed at the connection with the drive shaft 4. The encoder speed signal of the dual-output shaft motor 61 is transmitted to the servo driver, and the shaft speed sensor and torque flange signal are transmitted to the controller to realize the closed-loop control of the dual-output shaft motor 61.

[0065] The driver can monitor the overload signal of the dual-output shaft motor 61 and implement overload protection. The dual-output shaft motor 61 has an internal temperature monitoring sensor, and the controller collects the temperature signal to perform temperature protection.

[0066] In one embodiment of the present invention, the mounting mechanism 2 includes:

[0067] The connecting frame 21 is slidably installed inside the environmental chamber 1, and the connecting frame 21 is provided with a mounting position 22 for installing a car brake.

[0068] The second sliding device 23 is used to drive the connecting frame 21 to slide along the axial direction of the transmission shaft 4.

[0069] The mounting position 22 on the connecting frame 21 can be adjusted along the height direction and fixed by bolts. The second sliding device 23 is preferably a gear and rack assembly, which drives the connecting frame 21 to slide and adapt to different sizes of car brakes.

[0070] Below the second sliding device 23 is a pit and a vibration isolation base block, and a vibration isolation pad is arranged between the pit and the vibration isolation base block.

[0071] In one embodiment of the present invention, the drive shaft 4 is connected to the vehicle brake via a universal joint 8.

[0072] In one embodiment of the present invention, a soundproof partition is provided on the side wall of the environmental chamber 1.

[0073] The soundproof insulation layer consists of a 120mm thick polyurethane foam layer and a perforated steel plate (perforation rate 46.4%), with a sound insulation of ≥30dB and a background noise of ≤55dB(A), meeting the SAE J2521 standard.

[0074] In one embodiment of the present invention, a braking mechanism is also provided in the power compartment 3, which is used to drive the caliper of the automobile brake.

[0075] The controller controls the braking mechanism, using an electric cylinder to apply force to compress the brake fluid in the master cylinder, increasing the brake fluid pressure to achieve the braking force required when testing the vehicle's brakes. To quickly release the brake pressure, the electric cylinder drives the master cylinder back to its original position, while simultaneously releasing pressure using an vent valve and balancing the brake pressure using a brake fluid reservoir. An encoder on the electric cylinder provides displacement feedback to the controller, and a proximity switch is provided for overtravel protection.

[0076] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0077] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A vehicle brake NVH and braking performance comprehensive test system, characterized in that, The utility model relates to a kind of brake test device, including: Environment cabin (1), inside is provided with mounting mechanism (2), the mounting mechanism (2) is used to install automobile brake; Power cabin (3), inside is provided with transmission shaft (4), inertia mechanism (5) and power mechanism (6), the transmission shaft (4) one end enters the environment cabin (1) and is used to be detachably connected with the brake disc of the automobile brake, the inertia mechanism (5) is used to adjust the rotational inertia of the transmission shaft (4), the power mechanism (6) is used to drive the transmission shaft (4) to rotate and can adjust the torque of the transmission shaft (4); Control mechanism (7) can make the environment cabin (1) simulate the various working condition environments of the automobile brake; The inertia mechanism (5) includes: First inertia disc (51), coaxial with the transmission shaft (4) and detachably connected; Multiple second inertia discs (52), coaxial with the first inertia disc (51) are provided, adjacent two second inertia discs (52) are detachably connected, and the second inertia disc (52) close to the first inertia disc (51) is detachably connected with the first inertia disc (51); The inertia mechanism (5) further includes: Clamping device (53), slidably arranged above the first inertia disc (51) and multiple second inertia discs (52), the clamping device (53) can clamp and fix the second inertia disc (52); First sliding device (54) is used to drive the clamping device (53) to slide along the axial direction of the transmission shaft (4); The transmission shaft (4) is fixedly connected with coaxial taper assembly (55), the axis of the second inertia disc (52) is provided with taper assembly hole (56), and the assembly hole (56) can be inserted with the assembly (55).

2. The automobile brake NVH and braking performance comprehensive test system according to claim 1, characterized in that, The first inertia disc (51) and the second inertia disc (52) are detachably connected by bolts.

3. The automobile brake NVH and braking performance comprehensive test system according to claim 1, characterized in that, The power mechanism (6) includes: Double-output shaft motor (61), one output shaft is drivingly connected with the transmission shaft (4); Speed reduction motor (62), the output shaft of the double-output shaft motor (61) is drivingly connected with another output shaft through clutch (63).

4. The automobile brake NVH and braking performance comprehensive test system according to claim 1, characterized in that, The mounting mechanism (2) includes: Connecting frame (21), slidably arranged in the environment cabin (1), the connecting frame (21) is provided with mounting site (22) for installing the automobile brake; Second sliding device (23) is used to drive the connecting frame (21) to slide along the axial direction of the transmission shaft (4).

5. The automobile brake NVH and braking performance comprehensive test system according to claim 1, characterized in that, The transmission shaft (4) and the automobile brake are drivingly connected through universal shaft (8).

6. The automobile brake NVH and braking performance comprehensive test system according to claim 1, characterized in that, The side wall of the environment cabin (1) is provided with sound insulation layer.

7. The automobile brake NVH and braking performance comprehensive test system according to claim 1, characterized in that, The power cabin (3) is further provided with brake mechanism, and the brake mechanism is used to drive the caliper action of the automobile brake.

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