Roughness-adjustable friction simulation structure and tire emission particulate matter collecting device

Abstract

The invention discloses a roughness-adjustable friction simulation structure and a tire emission particulate matter collecting device, and relates to the technical field of motor vehicle emission pollutant testing, the friction simulation structure comprises a simulation support, a fixed chain wheel and a follow-up chain wheel, the simulation support is rotatably connected with an outer shaft and an inner shaft, the inner shaft is coaxially and rotatably connected with the outer shaft, and the fixed chain wheel is rotatably connected with the follow-up chain wheel; the inner shaft and the outer shaft are provided with a locking switching mechanism; the outer shaft is fixedly sleeved with the fixed chain wheel, and the exposed shaft body of the inner shaft is fixedly sleeved with the follow-up chain wheel. And the fixed chain wheel and the follow-up chain wheel can realize conversion and locking of relative positions under the action of the locking switching mechanism. The tire discharged particulate matter collecting device comprises a particulate matter collecting bin, a load applying assembly is installed on the upper portion of an inner cavity of the particulate matter collecting bin, and the bottom end of the load applying assembly is used for being rotationally connected with a to-be-tested tire. And the simulation bracket is fixed on the inner bottom wall of the particulate matter collection bin. According to the method, the tire wear conditions under different driving conditions are more accurately restored.

Description

Technical Field

[0001] The invention relates to the technical field of motor vehicle emission pollutant testing, and more particularly to a friction simulation structure with adjustable roughness and a tire emission particle collection device. Background Art

[0002] With the rapid development of the automobile industry and the enhancement of environmental awareness, the control and research of automobile emission particulate matter has become particularly important. During the driving process of the vehicle, the friction between the tires and the ground and the wear of the brakes will produce non-exhaust particulate matter emissions (NEE), which have a certain impact on the environment and human health.

[0003] Tire wear particles are non-exhaust emissions generated by friction and wear between tires and roads during driving. Such particles will be released into the air, soil and water sources, causing environmental pollution. Therefore, it is very important to study the generation conditions and influencing factors of tire wear particles. The generation of tire wear particles is related to factors such as speed, load, tire wear resistance and road roughness during vehicle operation. At present, there are many different forms of tire emission particle collection devices in this field, but most of the application scenarios are fixed stands, the connection between the tire and the drum cannot be sealed, and the drum surface material cannot be replaced.

[0004] Therefore, how to provide a tire real-time simulation structure that can change the surface roughness is a problem that those skilled in the art need to solve urgently. Summary of the invention

[0005] In view of this, the present invention provides a friction simulation structure with adjustable roughness and a tire emission particulate matter collection device, aiming to solve the above technical problems.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A friction simulation structure with adjustable roughness, comprising:

[0008] A simulated bracket, wherein an outer shaft is rotatably connected to a stand on one side of the simulated bracket, and an end of an inner shaft is rotatably connected to a stand on the other side of the simulated bracket, the inner shaft passes through the inner cavity of the outer shaft and is coaxially rotatably connected to the outer shaft, and the other end of the inner shaft and the end of the outer shaft away from the simulated bracket have a locking switching mechanism;

[0009] A fixed sprocket and a driven sprocket, wherein the fixed sprocket is fixedly sleeved on the outer shaft, and the driven sprocket is fixedly sleeved on the exposed shaft body of the inner shaft; the fixed sprocket and the driven sprocket can realize relative position transformation and locking under the action of the locking switching mechanism.

[0010] Preferably, in the above-mentioned friction simulation structure with adjustable roughness, the locking switching mechanism includes a shell fixed to the end of the outer shaft, and the shell is fitted with an end cover; a plurality of stop blocks are annularly fixed on the bottom wall of the shell, and a positioning hole is provided on the bottom wall of the shell; one end of the inner shaft away from the simulation bracket extends into the chamber formed by the shell and the end cover, and the end has a plurality of limit blocks abutting against the plurality of stop blocks, and the limit blocks have stop pins plugged into the positioning holes.

[0011] Preferably, in the above-mentioned friction simulation structure with adjustable roughness, an axially through-going oil passage is opened on the inner side of the inner shaft, and the end face of the inner shaft located on the inner side of the shell has an oil inlet and an oil return port connected to the oil passage, and the other end of the inner shaft is connected to an electromagnetic reversing valve through an oil pipe.

[0012] Preferably, in the above-mentioned friction simulation structure with adjustable roughness, it also includes a driving mechanism, which includes a drum driving motor, a driving sprocket, a driven sprocket and a driving chain; the drum driving motor is arranged on the outside of the simulation bracket, the driving sprocket is fixed to the power output end of the drum driving motor, the driven sprocket is fixedly sleeved on the outside of the shell, and the driving chain is sleeved between the driving sprocket and the driven sprocket.

[0013] Preferably, in the above-mentioned friction simulation structure with adjustable roughness, the fixed sprocket and the driven sprocket are both composed of a sprocket drum and a replaceable chain sleeved on the outside of the sprocket drum.

[0014] The present invention also provides a tire emission particulate matter collection device, comprising: a particulate matter collection bin; the upper part of the particulate matter collection bin is connected to an air inlet of the particulate matter collection bin, and the lower part of the particulate matter collection bin is connected to an air outlet of the particulate matter collection bin; a load application assembly is installed at the upper part of the inner cavity of the particulate matter collection bin, and the bottom end of the load application assembly is used to rotatably connect to the tire to be tested; the wheel axle of the tire to be tested is connected to the power output end of the tire drive motor arranged outside the particulate matter collection bin through a universal transmission shaft; the lower part of the inner cavity of the particulate matter collection bin is provided with the friction simulation structure with adjustable roughness, and the simulation bracket is fixed on the inner bottom wall of the particulate matter collection bin.

[0015] Preferably, in the above-mentioned tire emission particulate matter collection device, the load application assembly includes a hydraulic electric push rod and a tire bracket; the fixed rod of the hydraulic electric push rod is fixed on the inner top wall of the particulate matter collection bin, and its telescopic rod faces downward; the top surface of the tire bracket is connected to the end of the telescopic rod of the hydraulic electric push rod, the tire to be tested is fixed on the axle of the tire bracket, and the axle of the tire bracket is connected to the universal joint transmission shaft.

[0016] Preferably, in the above tire-emission particulate matter collection device, a pressure sensor is installed between the telescopic rod end of the hydraulic electric push rod and the top surface of the tire support.

[0017] Preferably, in the above tire emission particulate matter collection device, a temperature and humidity sensor is installed inside the particulate matter collection bin.

[0018] Preferably, in the above tire-emission particulate matter collection device, the universal transmission shaft is a transmission shaft with a universal coupling, and the universal transmission shaft can be telescopic.

[0019] Preferably, in the above tire-emission particulate matter collection device, the interior of the particulate matter collection bin is processed by rounding.

[0020] Preferably, in the above tire-emission particulate matter collection device, a sealed ball bearing is installed between the particulate matter collection bin and the connecting shaft of the tire drive motor.

[0021] Preferably, in the above tire emission particulate matter collection device, the particulate matter collection bin corresponds to the wrapped part of the universal transmission shaft using a conical pipe, which can prevent particulate matter from gathering in this part and affecting the transmission efficiency.

[0022] Preferably, in the above tire emission particulate matter collection device, the particulate matter collection bin is assembled from stainless steel plates, and the assembly points are connected with bolts and sealing gaskets to ensure the overall air tightness of the collection bin.

[0023] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a friction simulation structure with adjustable roughness and a tire emission particle collection device, which has the following beneficial effects:

[0024] 1. Efficient collection of tire wear particles: By designing a collection bin that completely wraps the tire and the drum, and rounding the connecting part inside the collection bin, the accumulation of particles can be prevented. A drive shaft with a universal coupling is installed between the tire shaft and the motor shaft, and sealed ball bearings are used at the connecting part between the drive shaft and the collection bin. This transmission design can ensure that the motor shaft is fixed, thereby reducing the movable gap inside the collection bin and effectively preventing particle leakage.

[0025] 2. Simulate real driving conditions: Use the hydraulic system to apply load to the tires to simulate the load of the vehicle during real driving. At the same time, the drum drive motor can simulate the resistance and inertia of the vehicle during driving. The tire drive motor simulates the acceleration and braking of the vehicle by adjusting the speed, thereby more accurately restoring the tire wear under different driving conditions.

[0026] 3. A variety of different road conditions can be simulated during the test: Since the chain on the drum can directly change the phase through the remote control electromagnetic reversing valve, the test drum can be used to simulate a variety of road conditions with different roughness in the same cycle, increasing the authenticity of the experiment.

[0027] 4. Flexible adaptation to different road materials: The chain on the drum surface is replaceable, which is convenient for testing tire particle emissions under different road roughness, enhancing the diversity and practicality of the experiment, and helping to conduct in-depth research on the relationship between tire wear particles and road materials.

[0028] 5. Precisely control the experimental environment: The temperature and humidity of the air flow entering the collection chamber can be adjusted according to the specified requirements and monitored in real time by sensors to achieve the purpose of cooling and purging, providing stable and controllable environmental conditions for the experiment.

[0029] 6. Easy operation and maintenance: The replacement process of the chain on the drum surface is simple and quick, without the need for complex tools or professional skills, which reduces the difficulty and time cost of experimental operation, and is also conducive to the long-term maintenance and maintenance of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0031] Figure 1 The accompanying drawing is a schematic structural diagram of a friction simulation structure with adjustable roughness provided by the present invention;

[0032] Figure 2 The accompanying drawing is a schematic structural diagram of the friction simulation structure with adjustable roughness provided by the present invention after the sprocket is removed;

[0033] Figure 3 The accompanying drawing is a structural cross-sectional view of a friction simulation structure with adjustable roughness provided by the present invention;

[0034] Figure 4 The accompanying drawing is a partial enlarged view of the locking switching mechanism provided by the present invention (the end cover is shown as transparent);

[0035] Figure 5 The accompanying drawing is a schematic structural diagram of a tire emission particle collection device provided by the present invention (the housing is shown as transparent);

[0036] Figure 6 The attached figure shows a tire emission particle collection device provided by the present invention (the housing is shown as transparent) and Figure 5Schematic diagram of the structure on the opposite side;

[0037] Figure 7 The accompanying drawing is a front view of the tire emission particulate matter collection device provided by the present invention (the housing is shown as transparent).

[0038] in:

[0039] 1- Particle collection bin;

[0040] 11-air inlet of particle collection bin; 12-air outlet of particle collection bin; 13-temperature and humidity sensor;

[0041] 2- Load application assembly;

[0042] 21- hydraulic electric push rod; 22- tire bracket; 23- pressure sensor;

[0043] 3- Tire to be tested;

[0044] 4-Universal drive shaft;

[0045] 5-Tire drive motor;

[0046] 6- Simulated bracket;

[0047] 61-outer shaft; 62-inner shaft; 621-oil channel; 622-oil inlet; 623-oil return port; 63-locking switching mechanism; 631-housing; 632-end cover; 633-stop block; 634-limit block; 635-oil pipe; 636-electromagnetic reversing valve;

[0048] 7-Fixed sprocket;

[0049] 71-sprocket drum; 72-replaceable chain;

[0050] 8-follower sprocket;

[0051] 9- driving mechanism;

[0052] 91 - drum driving motor; 92 - driving sprocket; 93 - driven sprocket; 94 - driving chain. DETAILED DESCRIPTION

[0053] 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 are within the scope of protection of the present invention.

[0054] Embodiment 1:

[0055] See attached Figure 1 , an embodiment of the present invention discloses a friction simulation structure with adjustable roughness, comprising:

[0056] The simulated bracket 6 has an outer shaft 61 rotatably connected to a stand on one side of the simulated bracket 6, and one end of an inner shaft 62 is rotatably connected to a stand on the other side of the simulated bracket 6. The inner shaft 62 passes through the inner cavity of the outer shaft 61 and is coaxially rotatably connected to the outer shaft 61. The other end of the inner shaft 62 and the end of the outer shaft 61 away from the simulated bracket 6 have a locking switching mechanism 63.

[0057] The fixed sprocket 7 and the driven sprocket 8 are fixedly sleeved on the outer shaft 61 and the driven sprocket 8 is fixedly sleeved on the exposed shaft body of the inner shaft 62; the fixed sprocket 7 and the driven sprocket 8 can realize relative position transformation and locking under the action of the locking switching mechanism 63.

[0058] See attached Figure 2 To Attachment Figure 4 The locking switching mechanism 63 includes a shell 631 fixed to the end of the outer shaft 61, and the shell 631 is fitted with an end cover 632; a plurality of stop blocks 633 are annularly fixed on the bottom wall of the shell 631, and a positioning hole is provided on the bottom wall of the shell 631; the end of the inner shaft 62 away from the simulation bracket 6 extends into the chamber formed by the shell 631 and the end cover 632, and the end has a plurality of limit blocks 634 abutting against the plurality of stop blocks 633, and the limit blocks 634 have stop pins plugged into the positioning holes.

[0059] In order to further optimize the above technical solution, an axially penetrating oil passage 621 is opened on the inner side of the inner shaft 62, and the end face of the inner shaft 62 located on the inner side of the shell 631 has an oil inlet 622 and an oil return port 623 connected to the oil passage 621, and the other end of the inner shaft 62 is connected to an electromagnetic reversing valve 636 through an oil pipe 635.

[0060] In order to further optimize the above technical solution, it also includes a driving mechanism 9, which includes a drum driving motor 91, a driving sprocket 92, a driven sprocket 93 and a driving chain 94; the drum driving motor 91 is arranged on the outside of the simulation bracket 6, the driving sprocket 92 is fixed to the power output end of the drum driving motor 91, the driven sprocket 93 is fixedly sleeved on the outside of the shell 631, and the driving chain 94 is sleeved between the driving sprocket 92 and the driven sprocket 93.

[0061] In order to further optimize the above technical solution, the fixed sprocket 7 and the driven sprocket 8 are both composed of a sprocket drum 71 and a replaceable chain 72 sleeved on the outside of the sprocket drum 71 .

[0062] In this embodiment, after the drum surface chain corresponding to the roughness is installed, the drum as a whole is driven by a motor, and the motor speed is adjusted according to the test cycle. After the entire cycle or cycle segment is completed, the electromagnetic reversing valve 636 and the oil pump can be controlled to pass hydraulic oil through the hydraulic oil circuit, so that the replaceable chain 72 on the surface of the driven sprocket 8 changes its relative phase, thereby directly changing the surface roughness of the drum.

[0063] If the overall roughness of the drum surface needs to be changed, the chain can be replaced with another material before the test begins.

[0064] The control principle of the lock switching mechanism 63 is:

[0065] The limit block 634 is connected to the inner shaft 62, the shell 631 is connected to the outer shaft 61, two sets of drum sprockets and surface chains are installed on the inner shaft 62, namely the driven sprocket 8, and the other two sets are installed on the outer 61, namely the fixed sprocket 7.

[0066] In the initial position, since there is no hydraulic oil pressure, the stop pin inside the limit block 634 is fixed in the positioning hole on the shell 631, locking the limit block 634 and the shell 631. At this time, the four sets of sprockets and chains are completely aligned, and correspond to the first type of drum surface roughness; when the electromagnetic reversing valve 636 and the hydraulic pump are used to input hydraulic oil into the shell 631 through the oil channel 621 in the inner shaft 62, the stop pin pops up under the action of the hydraulic oil, and at the same time, the hydraulic oil pushes the inner shaft 62 to rotate relative to the shell 631, and the sprocket and chain combination on the outer shaft 61 and the sprocket and chain combination on the inner shaft 62 undergo a relative phase change, which corresponds to the second type of drum surface roughness.

[0067] Specifically, the limit block 634 has a spring that cooperates with the stop pin. When there is no oil pressure, the stop pin is fixed to the inner shaft 62 and the housing 631 by the force of the spring; after the electromagnetic reversing valve 636 is controlled to input hydraulic oil to the oil inlet 622, the stop pin offsets the spring force under the action of the hydraulic oil, and the inner shaft 62 and the housing 631 are released. At the same time, the hydraulic oil enters the oil chamber formed by the stop block 633 and the limit block 634, and the inner shaft 62 and the housing 631 rotate relative to each other. The fixed sprocket 7 and the driven sprocket 8 form a phase difference and remain stable under the action of the hydraulic oil; after the electromagnetic reversing valve 636 is controlled to switch, hydraulic oil is input from the original return oil circuit to return the inner shaft 62 to the initial position. Since there is no oil pressure in the oil inlet circuit, the stop pin is reset under the action of the spring, and the inner shaft 62 and the housing 631 are fixed again.

[0068] Embodiment 2:

[0069] See attached Figure 5 To Attachment Figure 7The embodiment of the present invention discloses a tire emission particulate matter collection device, comprising: a particulate matter collection bin 1; the upper part of the particulate matter collection bin 1 is connected with a particulate matter collection bin air inlet 11, and the lower part of the particulate matter collection bin 1 is connected with a particulate matter collection bin air outlet 12; a load applying assembly 2 is installed at the upper part of the inner cavity of the particulate matter collection bin 1, and the bottom end of the load applying assembly 2 is used for rotationally connecting to a tire 3 to be tested; the wheel axle of the tire 3 to be tested is connected to the power output end of a tire drive motor 5 arranged outside the particulate matter collection bin 1 through a universal transmission shaft 4; a friction simulation structure with adjustable roughness of embodiment 1 is provided at the lower part of the inner cavity of the particulate matter collection bin 1, and a simulation bracket 6 is fixed on the inner bottom wall of the particulate matter collection bin 1.

[0070] In order to further optimize the above technical solution, the load application assembly 2 includes a hydraulic electric push rod 21 and a tire bracket 22; the fixed rod of the hydraulic electric push rod 21 is fixed on the inner top wall of the particle collection bin 1, and its telescopic rod faces downward; the top surface of the tire bracket 22 is connected to the end of the telescopic rod of the hydraulic electric push rod 21, and the tire 3 to be tested is fixed on the axle of the tire bracket 22, and the axle of the tire bracket 22 is connected to the universal joint transmission shaft 4.

[0071] In order to further optimize the above technical solution, a pressure sensor 23 is installed between the telescopic rod end of the hydraulic electric push rod 21 and the top surface of the tire bracket 22 .

[0072] In order to further optimize the above technical solution, a temperature and humidity sensor 13 is installed inside the particle collection bin 1 .

[0073] In order to further optimize the above technical solution, the universal transmission shaft 4 is a transmission shaft with a universal coupling, and the universal transmission shaft 4 can be telescopic.

[0074] In this embodiment, the schematic diagram of the collection device is as follows Figures 5 to 7 As shown, before the test begins, the replaceable chain 72 is installed on the outside of the sprocket drum 71 according to the road surface roughness required for the test, and the rotation mass conversion coefficient δ is calculated according to parameters such as vehicle mass and wheel radius, and this coefficient is used to obtain the speed and torque of the drum drive motor; the calculation of δ is shown in formula (1):

[0075]

[0076] Where m is the mass of the car, kg; r is the rolling radius of the wheel, m; i g is the transmission ratio of the transmission; i0 is the transmission ratio of the main reducer; η T is the mechanical efficiency; I w is the moment of inertia of the wheel, kg·m 2 ;I f is the moment of inertia of the flywheel, kg·m 2 .

[0077] And I w with I f The calculation of is shown in formula (2) and formula (3):

[0078] I w =M w r 2 #(2)

[0079]

[0080] Take a manual transmission fuel car as an example (referred to as the prototype car), the speed ratios of each gear and the final reduction ratio of the transmission are known. First, the wheel rolling radius is tested, then the wheel rotation equivalent mass and the flywheel rotation equivalent mass are tested respectively, and finally the rotation mass conversion coefficient of each gear is calculated. The mass of the prototype car is 1475kg, and the matching tire model is 185 / 65R15. The corresponding rolling radius is 0.302m, and the wheel rotation inertia ∑I w 4.032 kg·m 2 Taking the first gear of the prototype as an example, the transmission ratio is i g is 3.615, the transmission ratio i0 of the main reducer is 4.056, and the rotational mass conversion coefficient of the prototype vehicle is 1.2989 calculated according to formula (1).

[0081] According to the vehicle mass to be simulated, a load is applied to the tire 3 to be tested through the hydraulic electric push rod 21; air flow is introduced into the particle collection bin 1, and the temperature and humidity of the air flow must meet the specified requirements, and is monitored in real time through the temperature and humidity sensor 13 in the particle collection bin 1 to achieve the purpose of cooling and purging.

[0082] When the test cycle officially starts, the tire drive motor 5 and the drum drive motor 91 are started synchronously. The drum drive motor 91 can simulate the resistance and inertia of the vehicle during driving. The tire drive motor 5 simulates the acceleration and braking of the vehicle by speed regulation to complete the selected test road cycle; the air inlet 11 of the particle collection bin continues to flow into the air, and the air outlet 12 of the particle collection bin is connected to the filtering equipment or analytical instrument. After completing all the test work, the drive motor slows down and stops running, the hydraulic electric push rod 21 is unloaded, and the air flow continues to flow into the particle collection bin 1 until the collection of particles is completed.

[0083] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0084] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A friction simulation structure with adjustable roughness, characterized in that: include: A simulation bracket (6), wherein an outer shaft (61) is rotatably connected to a stand on one side of the simulation bracket (6), and one end of an inner shaft (62) is rotatably connected to a stand on the other side of the simulation bracket (6); the inner shaft (62) passes through the inner cavity of the outer shaft (61) and is coaxially rotatably connected to the outer shaft (61); the other end of the inner shaft (62) and an end of the outer shaft (61) away from the simulation bracket (6) are provided with a locking switching mechanism (63); A fixed sprocket (7) and a driven sprocket (8), wherein the fixed sprocket (7) is fixedly sleeved on the outer shaft (61), and the driven sprocket (8) is fixedly sleeved on the exposed shaft body of the inner shaft (62); the fixed sprocket (7) and the driven sprocket (8) can achieve relative position transformation and locking under the action of the locking switching mechanism (63).

2. A friction simulation structure with adjustable roughness according to claim 1, characterized in that: The locking switching mechanism (63) includes a shell (631) fixed to the end of the outer shaft (61), and the shell (631) is fitted with an end cover (632); a plurality of stop blocks (633) are annularly fixed on the bottom wall of the shell (631), and a positioning hole is provided on the bottom wall of the shell (631); the end of the inner shaft (62) away from the simulation bracket (6) extends into the chamber formed by the shell (631) and the end cover (632), and the end has a plurality of limit blocks (634) abutting against the plurality of stop blocks (633), and the limit blocks (634) have stop pins plugged into the positioning holes.

3. A friction simulation structure with adjustable roughness according to claim 2, characterized in that: An axially penetrating oil passage (621) is provided on the inner side of the inner shaft (62); an end surface of the inner shaft (62) located on the inner side of the housing (631) has an oil inlet (622) and an oil return port (623) connected to the oil passage (621); the other end of the inner shaft (62) is connected to an electromagnetic reversing valve (636) via an oil pipe (635).

4. A friction simulation structure with adjustable roughness according to claim 3, characterized in that: The invention also comprises a driving mechanism (9), wherein the driving mechanism (9) comprises a rotating drum driving motor (91), a driving sprocket (92), a driven sprocket (93) and a driving chain (94); the rotating drum driving motor (91) is arranged outside the simulation bracket (6), the driving sprocket (92) is fixed to the power output end of the rotating drum driving motor (91), the driven sprocket (93) is fixedly sleeved on the outside of the housing (631), and the driving chain (94) is sleeved between the driving sprocket (92) and the driven sprocket (93).

5. The friction simulation structure with adjustable roughness according to claim 1, characterized in that: The fixed sprocket (7) and the driven sprocket (8) are both composed of a sprocket drum (71) and a replaceable chain (72) sleeved on the outside of the sprocket drum (71).

6. A tire emission particulate matter collection device, characterized in that: include: A particle collecting bin (1); the upper part of the particle collecting bin (1) is connected to a particle collecting bin air inlet (11), and the lower part of the particle collecting bin (1) is connected to a particle collecting bin air outlet (12); a load applying assembly (2) is installed at the upper part of the inner cavity of the particle collecting bin (1), and the bottom end of the load applying assembly (2) is used for rotationally connecting to a tire to be tested (3); the axle of the tire to be tested (3) is connected to the power output end of a tire drive motor (5) arranged outside the particle collecting bin (1) through a universal transmission shaft (4); a friction simulation structure with adjustable roughness according to any one of claims 1 to 5 is provided at the lower part of the inner cavity of the particle collecting bin (1), and the simulation bracket (6) is fixed on the inner bottom wall of the particle collecting bin (1).

7. A tire emission particle collection device according to claim 6, characterized in that: The load applying assembly (2) comprises a hydraulic push rod (21) and a tire support (22); the fixing rod of the hydraulic push rod (21) is fixed on the inner top wall of the particle collecting bin (1), and the telescopic rod thereof faces downward; The top surface of the tire support (22) is connected to the telescopic rod end of the hydraulic electric push rod (21), the tire to be tested (3) is fixed on the wheel axle of the tire support (22), and the wheel axle of the tire support (22) is connected to the universal transmission shaft (4).

8. The tire emission particle collection device according to claim 7, characterized in that: A pressure sensor (23) is installed between the telescopic rod end of the hydraulic electric push rod (21) and the top surface of the tire support (22).

9. The tire emission particle collection device according to claim 6, characterized in that: A temperature and humidity sensor (13) is installed inside the particle collection bin (1).

10. The tire emission particle collection device according to claim 6, characterized in that: The universal transmission shaft (4) is a transmission shaft with a universal coupling, and the universal transmission shaft (4) can be telescopic.

Images