Wet brake of drive axle and maintenance early warning signal acquisition method of wet brake

Abstract

The invention discloses a wet brake of a drive axle and a maintenance early warning signal acquisition method of the wet brake in the technical field of brake system maintenance, and aims to solve the technical problem that brake failure of port engineering machinery during operation cannot be accurately pre-judged. The method comprises the following steps: comparing the residual life of a friction plate with a life threshold value to serve as a precondition for outputting a maintenance early warning signal, and outputting a maintenance early warning in advance to prevent the wet brake from losing efficacy when the engineering machinery is working; meanwhile, the brake oil temperature and the in-oil abrasive particle concentration which influence the brake effect of the friction plate serve as output judgment indexes for outputting maintenance early warning signals, stage early warning is conducted on the failure of the wet brake, and it is ensured that the remaining life of the friction plate cannot be exhausted when port engineering machinery executes a task with integrity uninterrupted; and stable operation of the wet brake within a certain working time is ensured.

Description

Technical Field

[0001] The invention relates to a wet brake of a drive axle and a method for acquiring a maintenance warning signal thereof, belonging to the technical field of brake system maintenance. Background Art

[0002] The drive axle of port machinery often uses wet brakes as a braking method.

[0003] Wet brakes often face negative working conditions such as heavy loads and high-frequency braking that affect their life and stability. At the same time, port machinery also has the characteristics of centralized operation, that is, when there is cargo to be loaded and unloaded, it needs to work uninterruptedly for a long time within a certain range. Interruptions in the middle will disrupt the order on site, so it is necessary to ensure the stable operation of wet brakes within a certain range of working time. Ordinary, general-purpose wet brakes will be maintained when they are close to their service life, while port machinery requires the stability of wet brakes within a specific period of time, so it is necessary to output maintenance warning signals before the service life or other negative working conditions reach the warning point. Summary of the invention

[0004] The purpose of this application is to overcome the deficiencies in the prior art and, for the special working conditions of port machinery, to provide a wet brake that can provide early warning and ensure stable braking within a certain range of working hours and a method for obtaining maintenance warning signals thereof.

[0005] In order to achieve the above objectives, this application is implemented by adopting the following technical solutions:

[0006] In a first aspect, the present disclosure provides a method for obtaining a maintenance warning signal of a wet brake.

[0007] Acquiring the wear amount of the friction plate, acquiring the remaining life of the friction plate according to the wear amount of the friction plate, and outputting a maintenance warning signal in response to the remaining life of the friction plate being less than a life threshold;

[0008] In response to the remaining life of the friction plate being greater than or equal to the life threshold, obtaining the brake oil temperature, and in response to the brake oil temperature being greater than the oil temperature threshold, outputting a maintenance warning signal;

[0009] In response to the remaining life of the friction plate being greater than or equal to the life threshold, the concentration of abrasive particles in the oil is acquired, and in response to the concentration of abrasive particles in the oil being greater than the concentration threshold, a maintenance warning signal is output.

[0010] In some embodiments of the first aspect, obtaining the remaining life of the friction plate according to the wear amount of the friction plate includes:

[0011] The current stroke of the brake piston is obtained, and the wear amount of the friction plate is calculated by the following formula:

[0012] ,

[0013] In the formula, is the friction plate wear, is the current stroke of the brake piston, is the initial stroke of the brake piston;

[0014] The wear warning threshold is obtained, and the remaining life of the friction plate is calculated by the following formula:

[0015] ,

[0016] In the formula, To obtain the initial travel of the brake piston To get the current travel of the brake piston The length of time between is the overall wear rate, is the wear warning threshold, The remaining life of the friction plate.

[0017] In some embodiments of the first aspect,

[0018] The overall wear rate is obtained. In response to the overall wear rate exceeding the wear rate switching threshold, the current stroke of the brake piston is used as the initial stroke of the new brake piston, and the current remaining wear amount is used as the new wear amount warning threshold. The new wear amount warning threshold is calculated and obtained by the following formula:

[0019] ,

[0020] In the formula, is the current remaining wear amount, i.e. the new wear amount warning threshold, is the current wear warning threshold, is the current friction plate wear amount.

[0021] In a second aspect, the present application also provides a wet brake for a drive axle, comprising:

[0022] A controller, configured to execute the method for obtaining a maintenance warning signal of a wet brake according to any one of the embodiments of the first aspect;

[0023] A friction plate assembly, used to brake the wheel hub;

[0024] A cooling oil chamber, used for cooling the friction plate assembly;

[0025] A displacement sensor, connected to the controller by electrical signals, for measuring the wear amount of the friction plate of the friction plate assembly;

[0026] a temperature sensor, electrically connected to the controller and used to measure the brake oil temperature in the cooling oil chamber;

[0027] The oil sensor is connected to the controller via an electrical signal and is used to measure the concentration of abrasive particles in the oil in the cooling oil cavity.

[0028] In some embodiments of the second aspect, it further includes a brake housing and a piston for pressing the friction plate assembly to brake the wheel hub, the piston is located in the brake housing, and the displacement sensor is used to detect the stroke of the piston.

[0029] In some embodiments of the second aspect, the friction plate assembly includes a metal plate and a friction plate, the metal plate is fixedly connected to the brake housing, the friction plate is fixedly connected to the wheel hub, multiple metal plates and multiple friction plates are alternately stacked, and the piston drives the friction plate assembly to be pressed internally to brake the wheel hub.

[0030] In some embodiments of the second aspect, the oil sensor is connected to the brake housing, the cooling oil chamber is located in the brake housing, the oil sensor is in communication with the cooling oil chamber, and the temperature sensor is integrated in the oil sensor.

[0031] In a third aspect, the present application further provides a computer device, comprising a processor and a memory connected to the processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the steps of the method for obtaining a maintenance warning signal for a wet brake as described in any embodiment of the first aspect are performed.

[0032] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method for obtaining a maintenance warning signal for a wet brake as described in any one of the embodiments of the first aspect.

[0033] In a fifth aspect, the present application also provides a computer program product, including a computer program / instruction, characterized in that when the computer program / instruction is executed by a processor, the steps of the method for obtaining a maintenance warning signal for a wet brake described in any embodiment of the first aspect are implemented.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] The wet brake of the drive axle and the method for obtaining the maintenance warning signal thereof provided in the present application use the comparison between the remaining life of the friction plate and the life threshold as a prerequisite for outputting the maintenance warning signal, output the maintenance warning in advance, and prevent the wet brake from failing when the engineering machinery is operating; at the same time, the brake oil temperature and the abrasive concentration in the oil that affect the braking effect of the friction plate are used as the basis for outputting the maintenance warning signal, and a stage warning is given for the failure of the wet brake to ensure that after the maintenance warning signal is output because the remaining life of the friction plate is less than the life threshold, the remaining life of the friction plate of the port engineering machinery will not be exhausted when the port engineering machinery is performing a task whose integrity cannot be interrupted, thereby ultimately ensuring the stable operation of the wet brake within a certain working time. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the present application or 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 some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 is a flowchart of the steps of the method for obtaining a maintenance warning signal of a wet brake provided in this embodiment;

[0038] Figure 2 is a schematic diagram of a power structure to which the wet brake provided in this embodiment is attached;

[0039] Figure 3 is a schematic structural diagram of a wet brake provided in this embodiment;

[0040] Figure 4 yes Figure 3 Side view of

[0041] Figure 5 yes Figure 3 Comparative schematic diagram of the wet brake in the initial state and braking state respectively;

[0042] Figure 6 yes Figure 3 Exploded view of the structure where the middle wheel hub and the friction plate are fixedly connected;

[0043] Figure 7 yes Figure 3 Exploded diagram of the structure of alternately stacked friction plate assemblies;

[0044] Figure 8 It is an exploded view of the structure where the brake ring body and the metal sheet are fixedly connected;

[0045] Fig. 9 is a schematic structural diagram of a wet brake provided in this embodiment;

[0046] Fig.10 is a schematic block diagram of the principles of the computer device provided in this embodiment;

[0047] In the figure: 1-main reduction assembly; 2-bridge housing assembly; 3-brake assembly; 4-wheel side assembly; 31-brake housing; 32-gasket; 33-friction plate assembly; 34-piston; 35-displacement sensor; 36-oil sensor; 37-brake cooling oil inlet; 38-brake cooling oil outlet; 33.1-metal sheet; 33.2-friction plate; 31.1-brake ring; 39-temperature sensor; 40-cooling oil chamber; 41-wheel hub; 42-controller. DETAILED DESCRIPTION

[0048] The technical solution of the present invention is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical solution of the present application, rather than limitations on the technical solution of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0049] The term "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0050] Embodiment 1:

[0051] Figure 1 This is a flow chart of a method for obtaining a maintenance warning signal of a wet brake in the first embodiment of the present invention. This flow chart only shows the logical sequence of the method described in this embodiment. In other possible embodiments of the present invention, different methods may be used without conflict. Figure 1 The steps shown or described are accomplished in the order shown.

[0052] The method for obtaining the maintenance warning signal of the wet brake provided in this embodiment can be applied to a terminal, for example, it can be executed by a vehicle controller VCU, or a cloud backend of an unmanned vehicle. Figure 1 The method of this implementation specifically includes the following steps:

[0053] Acquiring the wear amount of the friction plate, acquiring the remaining life of the friction plate according to the wear amount of the friction plate, and outputting a maintenance warning signal in response to the remaining life of the friction plate being less than a life threshold;

[0054] In response to the remaining life of the friction plate being greater than or equal to the life threshold, obtaining the brake oil temperature, and in response to the brake oil temperature being greater than the oil temperature threshold, outputting a maintenance warning signal;

[0055] In response to the remaining life of the friction plate being greater than or equal to the life threshold, the concentration of abrasive particles in the oil is acquired, and in response to the concentration of abrasive particles in the oil being greater than the concentration threshold, a maintenance warning signal is output.

[0056] It is not difficult to see from the above that the remaining life of the friction plate is the core monitoring indicator. The comparison result between the remaining life of the friction plate and the life threshold directly determines whether the wet brake works normally. When the remaining life of the friction plate is less than the life threshold, a maintenance warning signal is output. Compared with the early warning of the actual end of the life of the wet brake, the port engineering machinery will perform maintenance after completing the difficult-to-interrupt tasks it is performing. The significance of using the life threshold to give early warning of the friction plate wear is to allow the port engineering machinery to perform maintenance after completing the "on-hand" tasks, so as to prevent disruption of the on-site order.

[0057] For example, for port trailers, after the output maintenance warning signal appears, the friction plate maintenance is carried out after the goods are sent back to the starting point or delivered to the designated location; for gantry cranes, after the output maintenance warning signal appears, the friction plate maintenance is carried out after the goods are placed back to the starting point or placed at the end point.

[0058] If the maintenance warning signal is not output in advance by comparing the remaining life of the friction plate with the life threshold, the port engineering machinery may be in operation but the friction plate is suddenly exhausted, and it must be stopped immediately to block the road / stop the crane.

[0059] The remaining life of the friction plate is the core judgment indicator. Under the premise of meeting the remaining life standard of the friction plate, the brake oil temperature, which has a negative impact on the next level, will be used as the output maintenance warning signal indicator. When the brake oil temperature is overheated, the operation can be suspended to wait for cooling or inspection; otherwise, the overheated oil temperature will soften the friction plate and reduce the remaining life of the friction plate, causing the remaining life of the friction plate to drop sharply when the construction machinery is running. Even after the maintenance warning signal is output because the remaining life of the friction plate is less than the life threshold, the wet brake will suddenly fail when the task it is performing is completed, making the life threshold meaningless.

[0060] The abrasive concentration in the cooling oil in the wet brake will cause wear to the friction plate. As an indicator of a lower risk level than the remaining life of the friction plate, when the abrasive concentration in the oil is greater than the concentration threshold and a maintenance warning signal is output, the cooling oil should be replaced after the current round of operation is completed; otherwise, abrasive particles with too high a concentration will increase the wear rate of the friction plate and reduce the remaining life of the friction plate, causing the remaining life of the friction plate to drop sharply when the construction machinery is running. Even after a maintenance warning signal is output because the remaining life of the friction plate is less than the life threshold, the wet brake will suddenly fail at the end of the task it is performing, making the life threshold meaningless.

[0061] Whether the cooling oil temperature is too high or the abrasive concentration is too high, on-site processing can be carried out quickly, such as starting the cooling device to cool the oil temperature and driving the oil pump to replace the cooling oil, and then ending this round of operations.

[0062] If the above maintenance is not performed, the friction rate of the friction plate will gradually increase in a short period of time. Under this premise, if the maintenance warning signal is output in response to the remaining life of the friction plate being less than the life threshold, the triggering of the maintenance warning signal is based on the estimated life threshold specified in the past. The life threshold specified in the past is set based on a conventional situation, which is difficult to cover the abnormal conditions of excessive oil temperature and excessive abrasive concentration. At this time, the timing of issuing the warning signal will be relatively late. It is not difficult for those skilled in the art to see that the determination of the abrasive concentration in the oil and the determination of the brake oil temperature are complementary to the determination of the remaining life of the friction plate. The three conditions for outputting the maintenance warning signal are organically connected in series, and the sequence also has practical functional significance. They are all an indispensable, indivisible, and unchangeable part of the maintenance warning signal acquisition method provided in this embodiment.

[0063] The method for obtaining a maintenance warning signal for a wet brake provided in this embodiment uses the comparison between the remaining life of the friction plate and the life threshold as a prerequisite for outputting a maintenance warning signal, outputs a maintenance warning in advance, and prevents the wet brake from failing when the engineering machinery is in operation; at the same time, the brake oil temperature and the abrasive particle concentration in the oil that affect the braking effect of the friction plate are used as consideration indicators for outputting a maintenance warning signal, and performs a staged warning for wet brake failure, ensuring that after a maintenance warning signal is output because the remaining life of the friction plate is less than the life threshold, the port engineering machinery is not interrupted when performing tasks that cannot be interrupted in terms of integrity.

[0064] The remaining life of the friction plate will not be exhausted, ultimately ensuring stable operation of the wet brake within a certain working time.

[0065] It is worth noting that the life threshold is determined based on experience or experiments. For example, the maximum single friction plate wear of a port trailer on a complete transportation route is recorded or inferred, and the wear of the friction plate in a single complete task is multiplied by a conversion coefficient to ensure that the vast majority of situations are covered. The wear of the friction plate in a single complete task after coefficient correction is used as the life threshold. In this way, when a maintenance warning signal is output because the remaining life of the friction plate is less than the life threshold, the port trailer will have sufficient friction plate life redundancy, and maintenance can be carried out after the goods are delivered to the starting point / end point at any location on the transportation route.

[0066] As one embodiment, the amount of friction plate wear may be obtained and judged each time the brake is applied, or the amount of friction plate wear may be extracted at sampling intervals.

[0067] It is not difficult for those skilled in the art to see that the three signals can be one signal, or they can be respectively "friction plate maintenance signal", "cooling oil temperature drop signal" and "cooling oil maintenance signal". As one embodiment, the three signals are presented in the visualization component.

[0068] Embodiment 2:

[0069] This embodiment provides a method for obtaining a maintenance warning signal of a wet brake. This embodiment is optimized on the basis of the first embodiment to improve the technical effect and refine the technical solution. For contents not fully described in this embodiment, please refer to the first embodiment.

[0070] refer to Figure 3 In a wet brake, a piston 34 is used to push the friction plate assembly 33 to brake. The stroke of the piston 34 during braking can be obtained, and the wear amount of the friction plate can be obtained by comparing it with the initial stroke of the brake piston. The specific formula is as follows:

[0071] ,

[0072] In the formula, is the friction plate wear, The current stroke of the brake piston, obtained when the brake is pressed. It is the initial stroke of the brake piston, representing the extension value of the piston 34 in the initial state, that is, the wear degree or initial depth of the friction plate assembly 33 in the initial state; the initial state refers to that the friction plate assembly 33 is brand new and unused, or it can refer to an artificially specified state that has actually been worn to a certain extent.

[0073] Method for obtaining the initial stroke of the brake piston: determine the initial state of a friction plate assembly 33, the piston 34 pushes the friction plate assembly 33 to brake, and measure the stroke of the piston 34 as the initial stroke of the brake piston in the initial state; changing the initial state requires re-measuring the initial stroke of the brake piston.

[0074] The amount of friction plate wear represents the cumulative wear from the initial state to the current time period. Considering that port engineering machinery usually has a certain route, within a certain large range of time, such as a week, the daily braking frequency and the depth of each time are slightly different, but generally not much different. Therefore, the wear rate from the initial state to the current time period can be extracted, and then the remaining life of the friction plate can be deduced using this wear rate.

[0075] First, obtain the wear warning threshold and calculate the remaining life of the friction plate using the following formula:

[0076] ,

[0077] In the formula, To obtain the initial travel of the brake piston To get the current travel of the brake piston The length of time between is the overall wear rate, is the wear warning threshold, is the remaining life of the friction plate. If a constant wear rate is used to calculate the remaining life of the friction plate, the estimated remaining life of the friction plate will be inaccurate. is based on the current travel of the brake piston The friction lining wear The friction plate wear amount obtained With the current travel of the brake piston Constant dynamic changes, overall wear rate The estimated remaining life of the friction plate is also changing accordingly. Adaptive changes. For example, if the amount of wear increases gradually with each brake, the overall wear rate Continuous improvement will cause the remaining life of the friction plate shorten.

[0078] In summary, the method for obtaining the maintenance warning signal of the wet brake provided in this embodiment provides a specific calculation form compared with the first embodiment, which is more satisfactory for the remaining life of the friction plate. Friction plate wear Change, adaptively change the remaining life of the friction plate , making it more consistent with the actual remaining lifespan.

[0079] Embodiment three:

[0080] This embodiment is improved on the basis of the second embodiment to make the remaining life of the friction plate More in line with the actual remaining lifespan.

[0081] The previous embodiment mentioned that the remaining life of the friction plate is based on the current travel of the brake piston The friction lining wear The remaining life of the friction plate is obtained It is not a real-time quantity, but a measure of the overall wear rate. To reverse the remaining life of the friction plate It is based on the premise that port engineering machinery usually has a certain route, and within a certain large range of time, the braking density and depth per unit time are slightly different, but generally not much different.

[0082] In actual engineering applications, port engineering machinery may have different loads or change different types of cooling oils, or other factors, which may cause changes in the wear rate. That is, the real-time wear rate of the friction plate assembly 33 changes in stages, fluctuates within a single stage, and the average wear rate in different stages is quite different. If a uniform overall wear rate is used across stages, To measure the remaining life of the friction plate Since the wear rate in the current stage is inconsistent with the wear rate in the previous stage, the remaining life of the friction plate will be The inaccuracy will be affected by the wear rate of the previous stage, resulting in it not being close to the real-time state or the state of the current stage.

[0083] Therefore, it is necessary to introduce a set of update mechanisms to maximize the remaining life of the friction plate. Closer to real-time situation.

[0084] First, extract the overall wear rate calculated by Example 2 or other methods , set a switching threshold that can reflect the real-time wear rate change across stages, in response to the overall wear rate When the wear rate switching threshold is exceeded, the current stroke of the brake piston is used as the initial stroke of the new brake piston, and the friction pad wear amount is It will be calculated based on the initial stroke of the new brake piston. The current remaining wear amount is used as the new wear amount warning threshold, and the new wear amount warning threshold is calculated by the following formula:

[0085] ,

[0086] In the formula, The current remaining wear amount, i.e. the new wear amount warning threshold, represents the current wear amount warning threshold The remaining amount after the loss in the previous stage, is the current wear warning threshold, The current friction plate wear amount. The current remaining wear amount represents the remaining wear amount warning threshold consumed in the previous stage.

[0087] When the mission of the port engineering machinery changes, causing the real-time wear rate of the friction plate assembly 33 to change, the overall wear rate will If the friction plate starts to rise / fall beyond the fluctuation range and exceeds the switching threshold, it is judged that there has been a change in task load, a change in driver with a different driving style, a change in cooling oil due to temperature change, or a change in cooling oil. The current friction plate wear is used as the evaluation of the remaining life of the friction plate. The new starting point, so the current stroke of the brake piston is used as the initial stroke of the brake piston, and the subsequent overall wear rate The calculation is based on the initial travel of the new brake piston; it also takes into account the current friction pad wear. From the current wear warning threshold Deduct the current remaining wear amount and the initial stroke of the new brake piston, and the remaining life of the friction plate is calculated according to the method mentioned in Example 2. Evaluation shows that such a setting will reduce the remaining life of the friction plate The assessment is more consistent with the expected life span corresponding to the real-time wear rate of the friction plate assembly 33 in the current stage.

[0088] In addition, the switching threshold can be formulated according to the wear rate fluctuation range in the previous stage.

[0089] The following is an example of a port trailer using the maintenance warning signal acquisition method for the wet brake provided in this embodiment. The friction plate assembly 33 of the trailer is brand new, and the effective total thickness of 9.5 mm is used as the wear warning threshold at the beginning of the first stage. , , and at the same time measure the initial stroke of the corresponding brake piston 5mm, that is, there is a 5mm gap between the piston 34 and the friction plate assembly 33; in a braking operation at the end of the second week, the current stroke of the brake piston was measured. The friction plate wear at the end of the second week is 7mm. , , The length of time from the beginning to the end of the second week, the remaining life of the friction plate predicted at the end of the second week:

[0090] ;

[0091] However, at the end of the third week and the beginning of the fourth week, the trailer began to transport overweight goods. At the same time, cheap cooling oil with a higher concentration of abrasive particles in the oil was selected to cool the friction plate assembly 33 (but not exceeding the concentration threshold). Every time the brake was applied, the friction plate assembly 33 was in poor working condition and the real-time wear rate was very high. On the first day of the fourth week, the current travel of the brake piston was measured. The wear amount of the friction plate on the first day of the fourth week is 8.5 mm. , the duration from the beginning to the first day of the fourth week is , Take 3.1, set the switching threshold to 1.1 mm / week, and calculate the overall wear rate on the first day of the fourth week: .

[0092] based on As the current friction plate wear amount, calculate the current remaining wear amount, that is, the new wear amount warning threshold, as:

[0093] ;

[0094] The current travel of the brake piston As the initial stroke of a new brake piston;

[0095] On the first day of the fifth week, the current travel of the brake piston is measured is 11.5 mm, and the overall wear rate on the first day of the fifth week is obtained. 3mm / week, the remaining life of the friction plate on the first day of the fifth week: .

[0096] On the morning of the first day of the sixth week, the remaining life of the friction plate is 0.049 weeks, which is less than the previously set life threshold of 0.05 weeks. According to the maintenance warning signal acquisition method of the wet brake, a maintenance warning signal is output. The trailer is transporting goods at this time. After delivering the goods to the dock, it drives to the auto repair shop to start maintenance. At this time, the remaining life of the friction plate is 0.04 weeks.

[0097] The above only introduces the overall wear rate The corresponding situation of the increase is the overall wear rate at different stages For the decline situation, those skilled in the art may refer to the above, which will not be described in detail here.

[0098] The above distances are for reference only. Those skilled in the art may perform practices with similar principles but different processes during practice.

[0099] In summary, the method for obtaining a maintenance warning signal for a wet brake provided in this embodiment, compared to the second embodiment, takes more into account the changes in the real-time wear rate caused by different conditions when calculating the remaining life of the friction plate, and uses the change in the real-time wear rate as the time node to reset the wear amount warning threshold and the starting time point of the overall wear rate, thereby making the output maintenance warning signal based on the remaining life of the friction plate being less than the life threshold more accurate in timing.

[0100] Embodiment 4:

[0101] refer to Fig. 9 , This embodiment provides a wet brake device of a drive axle, including, a controller 42, used for the method for obtaining a maintenance warning signal of a wet brake provided in any one of the first to third embodiments;

[0102] The friction plate assembly 33 is used to brake the wheel hub 41;

[0103] A cooling oil chamber 40, used for cooling the friction plate assembly 33;

[0104] The displacement sensor 35 is electrically connected to the controller 42 and is used to measure the wear amount of the friction plate of the friction plate assembly 33;

[0105] The temperature sensor 39 is electrically connected to the controller 42 and is used to measure the brake oil temperature in the cooling oil chamber 40;

[0106] The oil sensor 36 is electrically connected to the controller 42 and is used to measure the concentration of abrasive particles in the oil in the cooling oil chamber 40 .

[0107] The method executed by the controller 42 can be referred to Figure 1 ,include:

[0108] Obtaining the wear amount of the friction plate, obtaining the remaining life of the friction plate according to the wear amount of the friction plate, and outputting a maintenance warning signal in response to the remaining life of the friction plate being less than a life threshold;

[0109] In response to the remaining life of the friction plate being above a life threshold, obtaining a brake oil temperature, and in response to the brake oil temperature being greater than an oil temperature threshold, outputting a maintenance warning signal;

[0110] In response to the remaining life of the friction plate being above a life threshold, obtaining the wear particle concentration in the oil, and in response to the wear particle concentration in the oil being greater than the concentration threshold, outputting a maintenance warning signal;

[0111] Obtain the remaining life of the friction plate based on the wear amount of the friction plate, including:

[0112] Get the current stroke of the brake piston and calculate the friction plate wear using the following formula:

[0113] ,

[0114] In the formula, is the friction plate wear, is the current stroke of the brake piston, is the initial stroke of the brake piston;

[0115] Obtain the wear warning threshold and calculate the remaining life of the friction plate using the following formula:

[0116] ,

[0117] In the formula, To obtain the initial travel of the brake piston To get the current travel of the brake piston The length of time between is the overall wear rate, is the wear warning threshold, is the remaining life of the friction plate;

[0118] The overall wear rate is obtained. In response to the overall wear rate exceeding the wear rate switching threshold, the current stroke of the brake piston is used as the initial stroke of the new brake piston, and the current remaining wear amount is used as the new wear amount warning threshold. The new wear amount warning threshold is calculated by the following formula:

[0119] ,

[0120] In the formula, is the current remaining wear amount, i.e. the new wear amount warning threshold, is the current wear warning threshold, is the current friction plate wear amount.

[0121] refer to Figure 2 In this embodiment, the axle housing assembly 2 of the drive axle is connected to the main reduction assembly 1, the main reduction assembly 1 drives the internal drive shaft of the axle housing assembly 2, the drive shaft drives the wheel hub 41 in the wheel side assembly 4, the brake assembly 3 is arranged between the axle housing assembly 2 and the wheel side assembly 4, and the brake housing 31 is fixedly connected to the axle housing assembly 2.

[0122] refer to Figure 3 The brake assembly 3 includes a brake housing 31 and a piston 34 that presses and drives the friction plate assembly 33 to brake the wheel hub 41. The piston 34 is located in the brake housing 31 and can move in response to instructions in the brake housing 31. The probe of the displacement sensor 35 is aimed at the piston 34 to monitor its extension. When the friction plate assembly 33 presses the wheel hub 41, refer to Figure 5 The displacement sensor 35 detects the extension of the piston 34 to determine the current stroke of the brake piston. or initial travel of the brake piston .

[0123] refer to Figure 6 , Figure 7 and Figure 8 The friction plate assembly 33 includes a metal plate 33.1 and a friction plate 33.2. The metal plate 33.1 is fixedly connected to the brake housing 31, and the friction plate 33.2 is fixedly connected to the wheel hub 41. Multiple metal plates 33.1 and multiple friction plates 33.2 are alternately stacked. The piston 34 drives the friction plate assembly 33 to press the inside to brake the wheel hub 41. Figure 8 As one embodiment, the brake housing 31 includes a brake ring body 31.1, which is concave to match the metal sheet 33.1, so as to better fix the metal sheet 33.1 from the outer ring of the metal sheet 33.1; the wheel hub 41 is fixedly connected with the friction plate 33.2 through a spline, and the piston 34 drives and presses the friction plate assembly 33, so that the metal sheet 33.1 and the friction plate 33.2 rub against each other to achieve the braking of the wheel hub 41. With such a setting, the braking is more stable and the data collected by the displacement sensor 35 is more accurate.

[0124] refer to Figure 3 and Figure 4 As one of the embodiments, the oil sensor 36 is connected to the brake housing 31, the cooling oil chamber 40 is located in the brake housing 31, the oil sensor 36 is connected to the cooling oil chamber 40 and the temperature sensor 39 is integrated in the oil sensor 36, the temperature sensor 39 and the oil sensor 36 collect cooling oil from the same part to ensure that the corresponding output maintenance warning signal output data sources are stable and unified.

[0125] refer to Figure 4 A plurality of displacement sensors 35 are provided corresponding to the plurality of pistons 34 , and a brake cooling oil outlet 38 and a brake cooling oil inlet 37 are provided on the brake housing 31 , which are respectively connected to the cooling oil chamber 40 .

[0126] The wet brake provided in this embodiment relies on the controller 42 to execute the maintenance warning signal acquisition method, and uses the comparison between the remaining life of the friction plate and the life threshold as a prerequisite for outputting the maintenance warning signal, outputting the maintenance warning in advance to prevent the wet brake from failing when the engineering machinery is working; at the same time, the brake oil temperature and the abrasive concentration in the oil that affect the braking effect of the friction plate are used as judgment indicators for outputting the maintenance warning signal, and performing stage warnings for wet brake failures to ensure that after the maintenance warning signal is output because the remaining life of the friction plate is less than the life threshold, the remaining life of the friction plate will not be consumed when the port engineering machinery is performing tasks whose integrity cannot be interrupted.

[0127] As one embodiment, it also includes displaying the remaining life of the friction plate A display is connected to the controller 42 by electrical signals.

[0128] As one example, refer to Figure 3 A gasket 32 ​​is also provided on the side of the friction plate assembly 33 facing away from the piston 34 , and the gasket 32 ​​is connected to the brake housing 31 .

[0129] Embodiment 4:

[0130] This embodiment provides a computer device, including a processor and a memory connected to the processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the steps of the method for obtaining a maintenance warning signal of a wet brake provided in Embodiment 1, 2 or 3 are performed.

[0131] The computer device may be a server or an electronic terminal. As one embodiment, refer to Fig.10, the computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store data acquired and generated in the method for acquiring maintenance warning signals for wet brakes. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, the method for acquiring maintenance warning signals for wet brakes provided in Embodiments 1, 2 or 3 is implemented.

[0132] Those skilled in the art will understand that Fig.10 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0133] The computer device provided in this embodiment has the same technical effects as those of Embodiments 1, 2 or 3, and will not be described in detail here.

[0134] Embodiment five:

[0135] This embodiment provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the steps of the method for obtaining a maintenance warning signal of a wet brake provided in the first or second embodiment are implemented.

[0136] The computer-readable storage medium provided in this embodiment has the same technical effects as those of Embodiments 1, 2 or 3, and will not be described in detail here.

[0137] Embodiment six:

[0138] This embodiment provides a computer program product, on which a computer program is stored, and when the program is executed by a processor, the steps of the method for obtaining a maintenance warning signal of a wet brake provided in Embodiment 1 or Embodiment 2 are implemented. The computer program product provided in this embodiment can be transmitted, distributed and downloaded in the form of a signal via the Internet.

[0139] The computer program product provided in this embodiment has the same technical effects as those of Embodiments 1, 2 or 3, and will not be described in detail here.

[0140] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0141] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0142] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0143] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0144] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions 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 limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0145] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0146] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for obtaining a maintenance warning signal of a wet brake, characterized in that: Acquiring the wear amount of the friction plate, acquiring the remaining life of the friction plate according to the wear amount of the friction plate, and outputting a maintenance warning signal in response to the remaining life of the friction plate being less than a life threshold; In response to the remaining life of the friction plate being greater than or equal to the life threshold, obtaining the brake oil temperature, and in response to the brake oil temperature being greater than the oil temperature threshold, outputting a maintenance warning signal; In response to the remaining life of the friction plate being greater than or equal to the life threshold, the concentration of abrasive particles in the oil is acquired, and in response to the concentration of abrasive particles in the oil being greater than the concentration threshold, a maintenance warning signal is output.

2. The method for obtaining a maintenance warning signal for a wet brake according to claim 1, characterized in that: The remaining life of the friction plate is obtained according to the wear amount of the friction plate. include, The current stroke of the brake piston is obtained, and the wear amount of the friction plate is calculated by the following formula: ， In the formula, is the friction plate wear, is the current stroke of the brake piston, is the initial stroke of the brake piston; The wear warning threshold is obtained, and the remaining life of the friction plate is calculated by the following formula: ， In the formula, To obtain the initial travel of the brake piston To get the current travel of the brake piston The length of time between is the overall wear rate, is the wear warning threshold, The remaining life of the friction plate.

3. The method for obtaining a maintenance warning signal for a wet brake according to claim 2, characterized in that: The overall wear rate is obtained. In response to the overall wear rate exceeding the wear rate switching threshold, the current stroke of the brake piston is used as the initial stroke of the new brake piston, and the current remaining wear amount is used as the new wear amount warning threshold. The new wear amount warning threshold is calculated and obtained by the following formula: ， In the formula, is the current remaining wear amount, i.e. the new wear amount warning threshold, is the current wear warning threshold, is the current friction plate wear amount.

4. A wet brake for a drive axle, characterized in that: include, A controller (42) configured to execute the method for obtaining a maintenance warning signal for a wet brake according to any one of claims 1 to 3; A friction plate assembly (33) for braking the wheel hub (41); A cooling oil chamber (40) for cooling the friction plate assembly (33); A displacement sensor (35) is electrically connected to the controller (42) and is used to measure the wear amount of the friction plate of the friction plate assembly (33); a temperature sensor (39) electrically connected to the controller (42) and used to measure the brake oil temperature in the cooling oil chamber (40); An oil sensor (36) is electrically connected to the controller (42) and is used to measure the concentration of abrasive particles in the oil in the cooling oil chamber (40).

5. The wet brake of the drive axle according to claim 4, characterized in that: It also includes a brake housing (31) and a piston (34) for pressing the friction plate assembly (33) to brake the wheel hub (41); the piston (34) is arranged in the brake housing (31); and the displacement sensor (35) is used to detect the stroke of the piston (34).

6. The wet brake of the drive axle according to claim 5, characterized in that: The friction plate assembly (33) comprises a metal plate (33.1) and a friction plate (33.2); the metal plate (33.1) is fixedly connected to the brake housing (31); the friction plate (33.2) is fixedly connected to the wheel hub (41); a plurality of metal plates (33.1) and a plurality of friction plates (33.2) are alternately stacked; the piston (34) drives the friction plate assembly (33) to be pressed internally to brake the wheel hub (41).

7. The wet brake of the drive axle according to claim 5, characterized in that: The oil sensor (36) is connected to the brake housing (31), the cooling oil chamber (40) is located in the brake housing (31), the oil sensor (36) is in communication with the cooling oil chamber (40), and the temperature sensor (39) is integrated in the oil sensor (36).

8. A computer device, characterized in that: It comprises a processor and a memory connected to the processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the steps of the method for obtaining a maintenance warning signal of a wet brake as claimed in any one of claims 1 to 3 are executed.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method for obtaining a maintenance warning signal for a wet brake according to any one of claims 1 to 3 are implemented.

10. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instructions are executed by a processor, the steps of the method for obtaining a maintenance warning signal for a wet brake as described in any one of claims 1 to 3 are implemented.

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