Device and method for measuring brake wear particles

Abstract

The invention discloses a device and method for measuring brake wear particles, and relates to the technical field of automobile testing, the device comprises a support and a device shell, the support is provided with a bottom plate, the bottom plate and the device shell form a sealed testing cavity, and a wear unit, a rotating unit and a supporting mechanism in the testing cavity are all arranged on the bottom plate; the abrasion unit applies pressure to the brake disc, the rotating unit drives the brake disc to rotate to generate brake abrasion particles, and the device shell is provided with an air inlet and an air outlet which enable air in the testing cavity to circulate. The gas circulates to drive the brake wear particles to move, and a gas outlet pipe of the gas outlet is communicated with a particle concentration analyzer to collect and analyze the generated brake wear particles. According to the device and the method for measuring the brake wear particles, the structure is simple, the air cleanliness in the test cavity can be controlled, and different test conditions can be adjusted, so that the discharge condition of the brake wear particles generated in the test cavity can be researched more accurately.

Description

Technical Field

[0001] The invention relates to the technical field of automobile testing, and in particular to a device and method for measuring brake wear particles. Background Art

[0002] The non-exhaust particulate matter emissions of automobiles mainly include the emission of brake system wear particles, tire wear particles and road dust. At present, the existing methods for measuring brake particles in the air include test methods and actual road test methods. The test method combines the characteristic data of the motor vehicle's braking condition with the vehicle's driving dynamics, and reproduces the braking cycle in the brake particle emission collection and analysis system to obtain the results by combining the data under each condition. This method is based on the derivation of theoretical formulas, which is too idealized and difficult to truly reflect the emission characteristics of brake particles in the actual journey of the vehicle.

[0003] The actual road test method is to install a device for real-time collection and analysis of motor vehicle brake particle emissions on the tested motor vehicle to obtain data on the braking condition of the motor vehicle during driving and data on the concentration, number and size distribution of particles during braking. However, this method makes it difficult to distinguish particles generated by brake friction from aerosols generated by other traffic and particles in the outside air.

[0004] Therefore, it is better to use experimental tests that can control the cleanliness of the surrounding air to more accurately study brake wear particles in the air. Summary of the invention

[0005] The purpose of the present invention is to provide a device and method for measuring brake wear particles, which has a simple structure, can control the air cleanliness in the test chamber, adjust different test conditions, and more accurately study the emission of brake wear particles generated in the test chamber.

[0006] To achieve the above object, the present invention provides a device for measuring brake wear particles, comprising a bracket and a device housing, a bottom plate is arranged on the bracket, the bottom plate and the device housing form a sealed test chamber, and the wear unit, the rotating unit and the supporting mechanism inside the test chamber are all arranged on the bottom plate; The wear unit applies pressure to the brake disc, and the rotating unit drives the brake disc to rotate to generate brake wear particles. An air inlet and an air outlet are arranged on the outer shell of the device to allow the gas in the test chamber to circulate; the gas circulation drives the brake wear particles to move, and the outlet pipe of the outlet is connected to the particle concentration analyzer to collect and analyze the generated brake wear particles.

[0007] Preferably, one side of the air inlet is connected to the particle filter, the air flow meter and the air compressor in sequence through the air inlet pipe, and the other side of the air inlet is connected to the device housing, and the particle filter and the device housing are sealed.

[0008] Preferably, the air outlet is arranged on the side of the device housing opposite to the air inlet, and the air outlet is connected to the particle concentration analyzer and the exhaust fan in sequence through the air outlet pipe.

[0009] Preferably, a transparent installation door is provided on the device housing, a sealing strip is provided on the edge of the installation door, and the installation door is sealed and connected to the device housing when closed.

[0010] Preferably, the wear unit includes a fixed seat, which is connected to the force seat through a connecting rod, the friction block and the pressure block are sleeved on the outside of the connecting rod, a tangential force sensor is provided on the side of the connecting rod close to the fixed seat, and a counterweight is placed on the force seat to control the force size.

[0011] Preferably, the fixing seat comprises a fixing portion fixed to the bottom plate of the bracket and a rotating portion fixedly connected to the tangential force sensor, and the rotating portion is rotatably connected to the fixing portion; A groove is provided on the rotating part, and mounting holes are provided at positions corresponding to the groove and the connecting rod. The connecting rod passes through the mounting holes to fix the tangential force sensor to the groove and the connecting rod respectively. A number of threaded holes are evenly distributed on the connecting rod, and the friction block and the pressure block are threadedly connected to the connecting rod through the threaded rod; A friction block is arranged on one side of the friction block pressure block close to the brake disc, and the friction block is in contact with the brake disc.

[0012] Preferably, the supporting mechanism includes a rotating wheel, a U-shaped bearing and a mounting seat. The mounting seat is detachably connected to the base plate, and the mounting seat is threadedly connected to the U-shaped bearing. A screw hole matching the thread on the mounting seat is provided at one end of the U-shaped bearing. The height of the supporting mechanism is controlled by controlling the depth of the threaded connection between the U-shaped bearing and the mounting seat. The rotating wheel is arranged in the U-shaped groove of the U-shaped bearing and is rotatably connected to the U-shaped bearing. The rotating wheel is in sliding contact with the brake disc.

[0013] The rotating wheel is located in the center of the U-shaped bearing and is hinged with the U-shaped bearing. The rotating wheel is in contact with the brake disc and is slidably connected with the brake disc.

[0014] Preferably, the rotating unit includes a T-shaped rotating seat and a rotating motor. The T-shaped rotating seat passes through the brake disc and is connected to the rotating shaft of the rotating motor. The top diameter of the T-shaped rotating seat is larger than the diameter of the central through hole of the brake disc. The rotating motor is connected to the reducer gear outside the test chamber, and the T-shaped rotating seat is detachably connected to the rotating shaft.

[0015] A method for using the device for measuring brake wear particles as described above comprises the following steps: S1. Open the transparent installation door of the device housing, remove the T-shaped rotating seat, fix the brake disc to the T-shaped rotating seat, and then connect the T-shaped rotating seat to the rotating motor; S2. Adjust the position of the mounting seat so that the rotating wheel contacts the brake disc; S3, remove the friction block pressing block on the connecting rod, install the friction block and then install the friction block pressing block on the connecting rod, so that the friction block contacts the position to be tested of the brake disc; S4, start the air compressor, and the gas enters the test chamber through the air flow meter and the particle filter in turn to control the intake air flow; S5, keep the intake air flow constant to simulate the braking process of the brake disc; The minimum pressure on the brake disc is the deadweight of the friction unit. The external pressure on the brake disc is increased by placing a counterweight on the force-applying seat. The weight of the added counterweight is controlled to measure the wear of the brake disc under different external pressures. The rotating motor is started to control the sliding speed between the brake disc and the friction block, and the generated particles enter the exhaust pipe along with the gas; the tangential force generated when the brake disc rotates is measured by the tangential force sensor, and the different speeds of the rotating motor are controlled to test the wear performance of the brake disc at different speeds; S6. The particle concentration analyzer collects the particles and concentration in the gas. After completion, open the transparent installation door, remove the brake disc, and use ethanol to wipe the inner wall of the test chamber and the wear unit.

[0016] Therefore, the present invention adopts a device for measuring brake wear particles with the above structure, and its beneficial effects are: 1. The device provided by the present invention has a simple structure, can control the air cleanliness in the test chamber, adjust different test conditions, and more accurately study the emission of brake wear particles generated in the test chamber; 2. Control the applied pressure on the brake disc by changing the size of the counterweight to measure the wear performance of the brake disc under different applied pressures; 3. The method provided by the present invention realizes the collection and measurement of vehicle brake pad wear particles during the braking process, which is independent of the motor vehicle and not affected by the cleanliness of the external air.

[0017] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a front cross-sectional view of a device for measuring brake wear particles according to the present invention; Figure 2 It is an isometric view of the distribution of units on the bracket and the bottom plate of a device for measuring brake wear particles of the present invention; Figure 3 is a schematic diagram of a device for measuring brake wear particles according to the present invention; Figure 4 The figure is a schematic diagram of a supporting mechanism of a device for measuring brake wear particles according to the present invention.

[0019] Reference numerals 1. Device housing; 2. Wear unit; 3. Rotation unit; 4. Support mechanism; 5. Air inlet; 6. Brake disc; 7. Air outlet; 8. Particle concentration analyzer; 9. Mounting door; 10. Bracket; 11. Exhaust fan; 21. Fixed seat; 22. Tangential force sensor; 23. Connecting rod; 24. Friction block and pressure block; 25. Friction block; 26. Groove; 27. Mounting hole; 28. Force seat; 29. ​​Counterweight block; 31. T-shaped rotating seat; 32. Rotating motor; 33. Reducer; 41. rotating wheel; 42. U-shaped bearing; 43. mounting seat; 51. Particle filter; 52. Air flow meter. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages disclosed in the embodiments of the present invention clearer, the embodiments of the present invention are further described in detail in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the embodiments of the present invention and are not intended to limit the embodiments of the present invention. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions.

[0021] It should be noted that the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or server that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or inherent to these processes, methods, products or devices.

[0022] Like reference numerals and letters denote similar items in the following drawings, and thus, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0023] Embodiment 1 A device for measuring brake wear particles, the structure of which is as follows Figures 1 to 4As shown, it includes a bracket 10, a bottom plate is arranged on the bracket 10, and a device housing 1, a wear unit 2, a rotation unit 3 and a support mechanism 4 are installed on the bottom plate. A sealed test chamber is formed between the device housing 1 and the bottom plate of the bracket 10, and the wear particle test of the brake disc 6 is performed inside the test chamber. Among them, the wear unit 2 applies pressure to the brake disc 6, the rotation unit 3 drives the brake disc 6 to rotate to generate brake wear particles, and the support mechanism 4 supports the edge of the brake disc 6 to ensure that the brake disc 6 rotates horizontally. An air inlet 5 and an air outlet 7 are respectively arranged at both ends of the device housing 1 for the circulation of gas in the test chamber 1.

[0024] The air inlet 5 is connected to the inside of the device housing 1, and a particle filter 51 is provided at the connection point. A sealing ring is provided between the particle filter 51 and the device housing 1 for sealing connection. The air intake side of the air inlet 5 is connected to the particle filter 51, the air flow meter 52 and the air compressor in sequence through the air intake pipe. The gas pumped in by the air compressor passes through the particle filter 51 to remove interfering particles in the air. The air compressor can control the intake flow rate, and the air flow meter 52 detects the intake volume.

[0025] The particle filter 51 is provided to prevent the wear particles in the test cavity from flowing back into the intake pipe and affecting the next test result. The sealing ring is provided to ensure the sealing effect inside the test cavity and prevent the wear particles inside the test cavity from leaking.

[0026] The air outlet 7 is arranged on the side of the device housing 1 opposite to the air inlet 5. The air outlet 7 is connected to the exhaust fan 11 through an air outlet pipe. A particle concentration analyzer 8 is arranged between the air outlet 7 and the exhaust fan 11. The exhaust fan 11 assists the air outlet pipe to extract the wear particles in the test chamber 1. The wear particles moving with the air are collected and analyzed by the particle concentration analyzer 8.

[0027] The sealed connection between the device housing 1 and the bracket 10 is an existing sealing method, which ensures the sealing of the test cavity and can prevent particles in the external air from entering the test cavity to interfere with the test results, and prevent wear particles inside the test cavity from leaking out of the test cavity.

[0028] In order to facilitate observation of the progress of the test, a transparent installation door 9 is provided on the device housing 1, and a sealing strip is provided on the edge of the installation door 9. The connection and closure method between the transparent installation door 9 and the test chamber 1 is the connection and closure method in the prior art.

[0029] The wear unit 2 includes a fixed seat 21, a tangential force sensor 22, a connecting rod 23, a friction block pressing block 24, a friction block 25, a groove 26, a mounting hole 27, a force applying seat 28 and a counterweight 29. The fixed seat 21 is connected to the force applying seat 28 through the connecting rod 23, the friction block pressing block 24 is sleeved on the outside of the connecting rod 23, and the tangential force sensor 22 is located on the connecting rod 23 near the fixed seat 21.

[0030] Specifically, the fixing seat 21 is L-shaped, including a fixing portion fixed to the bottom plate of the bracket 10 and a rotating portion fixedly connected to the tangential force sensor 22, and the rotating portion and the fixing portion are rotatably connected. A groove 26 is provided on the rotating portion, and mounting holes 27 are provided at positions corresponding to the tangential force sensor 22, the groove 26, and the connecting rod 23. The connecting rod passes through the mounting hole 27 to fix the tangential force sensor 22 to the groove 26 and the connecting rod 23, respectively.

[0031] The friction block 25 is arranged on the side of the friction block pressing block 24 close to the rotating unit 3, and the counterweight block 29 is placed on the force application seat 28. A plurality of threaded holes are evenly distributed on the connecting rod 23, and the friction block pressing block 24 is threadedly connected to the connecting rod 23 through a threaded rod to fix the position of the friction block pressing block 24.

[0032] The force exerted by the friction block 25 on the brake disc 6 can be adjusted by adjusting the position of the friction block pressure block 24 and the weight of the counterweight block 29. A support mechanism 4 is provided below the friction block 25, and a brake disc 6 is provided between the friction block 25 and the support mechanism 4. The brake disc 6 is detachably connected to the rotating unit 3 at the bottom of the test chamber.

[0033] By adjusting the applied pressure and force position of the friction block 25 on the brake disc 6, the wear condition of the brake disc 6 under different applied pressures and force positions is tested. The wear particles are driven out of the test chamber by air intake and air exhaust, and the discharge condition of the wear particles is detected and analyzed.

[0034] The supporting mechanism 4 includes a rotating wheel 41, a U-shaped bearing 42, and a mounting seat 43. The mounting seat 43 can be detachably fixed to the bottom plate of the bracket 10, and the position of the mounting seat 43 can be adjusted according to the size and position of the brake disc 6.

[0035] The mounting seat 43 is threadedly connected to the U-shaped bearing 42. One end of the U-shaped bearing 42 is provided with a screw hole matching the screw thread on the mounting seat 43. By controlling the depth of the screw connection between the U-shaped bearing 42 and the mounting seat 43, the height of the support mechanism 4 is controlled. The rotating wheel 41 is disposed in the U-shaped groove of the U-shaped bearing 42 and is rotatably connected to the U-shaped bearing 42. The rotating wheel 41 is in sliding contact with the brake disc 6.

[0036] The brake disc 6 contacts and presses down the rotating wheel 41 , and the bearing support 42 is arranged to ensure that the rotating wheel 41 rolls when the brake disc 6 rotates, thereby reducing the friction force brought by the rotating wheel 41 to the brake disc 6 and playing a shock-absorbing role in the rotation of the brake disc 6 .

[0037] The rotating unit 3 includes a T-shaped rotating seat 31 and a rotating motor 32, and one side of the rotating motor 32 is fixedly connected to the bottom plate. The T-shaped rotating seat 31 penetrates the brake disc 6 and is connected to the rotating shaft of the rotating motor 32. The top diameter of the T-shaped rotating seat 31 is larger than the diameter of the central through hole of the brake disc 6. The rotating motor 32 is connected to the reducer 33 outside the test chamber. The T-shaped rotating seat 31 is detachably connected to the rotating shaft. After the T-shaped rotating seat 31 is removed, the brake disc 6 is fixedly connected to the T-shaped rotating seat 31, and then the T-shaped rotating seat 31 is installed on the rotating shaft and fixed. The reducer 33 controls the speed of the rotating motor 32, thereby adjusting the speed of the brake disc 6 connected thereto.

[0038] Embodiment 2 A method for using a device for measuring brake wear particles comprises the following steps: S1. Open the transparent installation door 9 of the device housing 1, remove the T-shaped rotating seat 31, fix the brake disc 6 to the T-shaped rotating seat 31, and then connect the T-shaped rotating seat 31 to the rotating motor 32.

[0039] S2. Adjust the position of the mounting seat 43 so that the rotating wheel 41 contacts the edge of the brake disc 6.

[0040] S3, remove the friction block pressing block 24 on the connecting rod 23, install the friction block 25 and then install it on the connecting rod 23, so that the friction block 25 contacts the position to be tested of the brake disc 6.

[0041] S4, start the air compressor, and the gas enters the test chamber through the air flow meter 52 and the particle filter 51 in sequence to control the intake air flow.

[0042] S5, keeping the intake air flow constant, simulating the braking process of the brake disc 6.

[0043] The minimum pressure on the brake disc 6 is the deadweight of the friction unit 2. The external pressure on the brake disc 6 is increased by placing a counterweight 29 on the force application seat 28. The weight of the added counterweight 29 is controlled to measure the wear of the brake disc 6 under different external pressures. The magnitude of the external pressure applied to the brake disc 6 is calculated by the lever principle.

[0044] The rotating motor 32 is started to control the sliding speed of the brake disc 6 and the friction block 25, and the generated particles enter the exhaust pipe along with the gas. The tangential force generated when the brake disc 6 rotates is measured by the tangential force sensor 22, and the different speeds of the rotating motor 32 are controlled to measure the wear performance of the brake disc 6 at different speeds.

[0045] S6. The particle concentration analyzer 8 collects the particles and concentration in the gas. After completion, the transparent installation door 9 is opened, the brake disc 6 is removed, and ethanol is used to wipe the inner wall of the device housing 1 and the wear unit 2 to ensure that the inside of the device is clean and there is no residual particle.

[0046] Therefore, the present invention adopts a device and method for measuring brake wear particles of the above structure, which has a simple structure and can control the air cleanliness in the test chamber, thereby more accurately studying the emission of brake wear particles generated in the test chamber.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A device for measuring brake wear particles, comprising a bracket and a device housing, characterized in that: A bottom plate is arranged on the bracket, and the bottom plate and the device housing form a sealed test chamber, and the wear unit, the rotation unit and the support mechanism inside the test chamber are all arranged on the bottom plate; The wear unit applies pressure to the brake disc, and the rotating unit drives the brake disc to rotate to generate brake wear particles. An air inlet and an air outlet are arranged on the outer shell of the device to allow the gas in the test chamber to circulate; the gas circulation drives the brake wear particles to move, and the outlet pipe of the outlet is connected to the particle concentration analyzer to collect and analyze the generated brake wear particles.

2. The device for measuring brake wear particles according to claim 1, characterized in that: One side of the air inlet is connected to the particle filter, the air flow meter and the air compressor in sequence through the air inlet pipe, and the other side of the air inlet is connected to the device casing, and the particle filter and the device casing are sealed.

3. The device for measuring brake wear particles according to claim 1, characterized in that: The air outlet is arranged on the side of the device shell opposite to the air inlet, and the air outlet is connected with the particle concentration analyzer and the exhaust fan in sequence through the air outlet pipe.

4. The device for measuring brake wear particles according to claim 1, characterized in that: A transparent installation door is arranged on the device shell, a sealing strip is arranged on the edge of the installation door, and the installation door is sealed and connected with the device shell when closed.

5. The device for measuring brake wear particles according to claim 1, characterized in that: The wear unit includes a fixed seat, which is connected to the force seat through a connecting rod. The friction block and pressure block are sleeved on the outside of the connecting rod. A tangential force sensor is provided on the connecting rod near the fixed seat. A counterweight is placed on the force seat to control the force size.

6. The device for measuring brake wear particles according to claim 5, characterized in that: The fixing seat comprises a fixing part fixed on the bottom plate of the bracket and a rotating part fixedly connected to the tangential force sensor, and the rotating part is rotatably connected to the fixing part; A groove is provided on the rotating part, and mounting holes are provided at positions corresponding to the groove and the connecting rod. The connecting rod passes through the mounting holes to fix the tangential force sensor to the groove and the connecting rod respectively. A number of threaded holes are evenly distributed on the connecting rod, and the friction block and the pressure block are threadedly connected to the connecting rod through the threaded rod; A friction block is arranged on one side of the friction block pressure block close to the brake disc, and the friction block is in contact with the brake disc.

7. The device for measuring brake wear particles according to claim 1, characterized in that: The supporting mechanism includes a rotating wheel, a U-shaped bearing and a mounting seat. The mounting seat is detachably connected to the base plate. The mounting seat is threadedly connected to the U-shaped bearing. One end of the U-shaped bearing is provided with a screw hole matching the thread on the mounting seat. The height of the supporting mechanism is controlled by controlling the depth of the threaded connection between the U-shaped bearing and the mounting seat. The rotating wheel is arranged in the U-shaped groove of the U-shaped bearing and is rotatably connected to the U-shaped bearing. The rotating wheel is in sliding contact with the brake disc.

8. The device for measuring brake wear particles according to claim 1, characterized in that: The rotating unit includes a T-shaped rotating seat and a rotating motor. The T-shaped rotating seat penetrates the brake disc and is connected to the rotating shaft of the rotating motor. The top diameter of the T-shaped rotating seat is larger than the diameter of the central through hole of the brake disc. The rotating motor is connected to the reducer gear outside the test chamber, and the T-shaped rotating seat is detachably connected to the rotating shaft.

9. A method for using the device for measuring brake wear particles according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Open the transparent installation door of the device housing, remove the T-shaped rotating seat, fix the brake disc to the T-shaped rotating seat, and then connect the T-shaped rotating seat to the rotating motor; S2. Adjust the position of the mounting seat so that the rotating wheel contacts the brake disc; S3, remove the friction block pressing block on the connecting rod, install the friction block and then install the friction block pressing block on the connecting rod, so that the friction block contacts the position to be tested of the brake disc; S4, start the air compressor, and the gas enters the test chamber through the air flow meter and the particle filter in turn to control the intake air flow; S5, keep the intake air flow constant to simulate the braking process of the brake disc; The minimum pressure on the brake disc is the deadweight of the friction unit. The external pressure on the brake disc is increased by placing a counterweight on the force-applying seat. The weight of the added counterweight is controlled to measure the wear of the brake disc under different external pressures. The rotating motor is started to control the sliding speed between the brake disc and the friction block, and the generated particles enter the exhaust pipe along with the gas; the tangential force generated when the brake disc rotates is measured by the tangential force sensor, and the different speeds of the rotating motor are controlled to test the wear performance of the brake disc at different speeds; S6. The particle concentration analyzer collects the particles and concentration in the gas. After completion, open the transparent installation door, remove the brake disc, and use ethanol to wipe the inner wall of the test chamber and the wear unit.

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