CN112483567B - Brake pad thickness detection device for drum brake and detection method thereof - Google Patents
Brake pad thickness detection device for drum brake and detection method thereof Download PDFInfo
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- CN112483567B CN112483567B CN202011285511.4A CN202011285511A CN112483567B CN 112483567 B CN112483567 B CN 112483567B CN 202011285511 A CN202011285511 A CN 202011285511A CN 112483567 B CN112483567 B CN 112483567B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
- F16D66/02—Apparatus for indicating wear
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
- F16D66/02—Apparatus for indicating wear
- F16D66/021—Apparatus for indicating wear using electrical detection or indication means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
- F16D2066/001—Temperature
Abstract
The invention relates to the technical field of brake application, and discloses a brake block thickness detection device for a drum brake and a detection method thereof, wherein the brake block thickness detection device comprises a brake drum, a brake shoe, a driving piece and a display module, the brake shoe comprises an upper shoe and a lower shoe, and a return spring assembly is arranged between the upper shoe and the lower shoe; the return spring assembly comprises an upper spring, a lower spring, a tension detection device and a sleeve, wherein the tension detection device is arranged between the upper spring and the lower spring; the sleeve is provided with a data processing module and a storage module, the tension detection device sends tension data of the upper spring and the lower spring to the data processing module for processing, and the data processing module sends the processed data to the storage module and the display module respectively. The upper hoof and the lower hoof of the detection device are respectively connected with one spring, the tension detection device can detect the tension value of the upper spring or the lower spring, and the data processing module can calculate the elongation of the upper spring or the lower spring through the tension value, so that the abrasion loss of the brake pad is calculated.
Description
Technical Field
The invention relates to the technical field of brake application, in particular to a brake pad thickness detection device for a drum brake and a detection method thereof.
Background
In the current market, drum brakes are generally used for a braking system of a truck, the drum brakes utilize brake pads which are static in a brake drum to rub the brake drum rotating along with wheels, friction force is generated, and the rotating speed of the wheels is reduced. However, almost no brake pad thickness detection device for drum brakes is available on the market, and most drivers only rely on driving experience to judge whether the brake pads need to be replaced. The brake pad is worn seriously to cause brake failure, so that accidents are frequently caused, and the brake pad thickness detection device is very important.
Meanwhile, the existing drum brake driving brake shoe basically adopts a pulling wire, such as the application number: 201410738244.X, when the pulling plate 24 is moved by the pulling force applied to the wire connecting portion 241, the first driving portion 243 and the second driving portion 251 are rotated away from each other. Although this structure can drive the brake shoes to spread, it is difficult to drive the brake shoes to spread by swinging the two members relative to each other. Meanwhile, the first driving part 243 and the second driving part 251 are in hole fit with corresponding brake shoes, and the fit area between the first driving part 243 and the second driving part 251 is small, so that the first driving part and the second driving part are easy to break, and brake failure is caused.
Disclosure of Invention
The invention provides a brake pad thickness detection device for a drum brake and a detection method thereof, aiming at the defects in the prior art.
In order to solve the technical problem, the invention is solved by the following technical scheme:
the brake pad thickness detection device for the drum brake comprises a base plate, a brake drum, a brake shoe, a driving piece and a display module arranged in a vehicle, wherein the brake drum, the brake shoe and the driving piece are all arranged on the base plate; the return spring assembly comprises an upper spring, a lower spring, a tension detection device and a sleeve, wherein the upper spring, the lower spring and the tension detection device are all arranged in the sleeve; one end of the lower spring is connected with the other end of the tension detection device, and the other end of the lower spring is connected with the lower hoof; the sleeve is provided with a data processing module and a storage module, the tension detection device is electrically connected with the storage module and the data processing module respectively, the tension detection device sends tension data of the upper spring and the lower spring to the data processing module for processing, and the data processing module sends the processed data to the storage module and the display module respectively.
A return spring is also arranged on the traditional brake shoe, but only one return spring is arranged on the traditional brake shoe, and the return spring connects the upper shoe and the lower shoe together to play a role in returning. This brake block thickness detection device adds another spring to make last hoof and lower hoof have a spring coupling respectively, install a tension detection device again between last spring and the lower spring, tension detection device can detect out the pulling force value of going up spring or lower spring, and data processing module can calculate the elongation of going up spring or lower spring through the pulling force value often, and data processing module compares newly-measured spring elongation and the spring elongation of first survey and obtains the wearing and tearing volume of brake block. The display screen module can feed back the wearing and tearing volume of the back brake block of once traveling often, and people can master the wearing and tearing condition of brake block often, reduces the degree of difficulty that the driver judges brake block thickness, makes the vehicle travel safelyr.
Preferably, the tension detection device comprises a fixed seat made of a tension sensor and a heat-resistant material, fixed rods are installed between the sleeve and the two sides of the fixed seat, a channel through which a power supply line passes is formed in each fixed rod, the two ends of each fixed seat are respectively connected with an upper spring and a lower spring, grooves are formed in the fixed seat and are formed between the two fixed rods, and the tension sensor is installed in each groove.
The tension detection device is used for detecting the tension value of the upper spring or the lower spring, and the data processing module can calculate the abrasion loss of the brake pad conveniently. The fixing base made of the heat-resistant material can better protect the tension sensor, and the tension sensor is fixed in the groove of the fixing base, so that the fixing base and the tension sensor are firmly fixed and are not easy to loosen. The fixing base is also used for fixing the sleeve, so that the upper spring and the lower spring can be suspended in the sleeve, the upper spring and the lower spring are convenient to stretch, and mutual interference is avoided.
Preferably, the brake shoe temperature monitoring device further comprises an alarm device installed in the cab, a temperature measuring module used for detecting the brake shoe temperature value is fixed on the sleeve, the temperature measuring module is electrically connected with the data processing module and the storage module respectively, the temperature measuring module sends detected temperature data to the data processing module, the data processing module sends the processed data to the storage module and the display module, and the data processing module controls the alarm device to be started and stopped through the processed data.
The driver is not concerned about the wearing capacity of the brake pad, but can be reminded to replace the brake pad obviously through the alarm device due to different personal habits, so that the driver is prevented from forgetting, and the safety of automobile braking is improved. Meanwhile, the sleeve is also provided with a temperature measuring module, the influence of the temperature in the brake drum on the braking effect of the brake pad can not be ignored, when the temperature exceeds 300 ℃, the brake of the brake drum has a heat fading phenomenon, and the brake drum can also deform during braking, so that the braking effect is seriously influenced. In addition, when the brake drum temperature is too high, grease in the hub bearing may melt, resulting in failure of the hub bearing. In order to detect the working state of the brake pad, the temperature measuring device arranged on the surface of the return spring assembly can detect the temperature change in the brake drum in real time, and the temperature detection information of each time is transmitted to the storage module and the data processing module through electric connection.
Preferably, brake pads are fixed on the upper shoe and the lower shoe, heat conducting holes are formed in the brake pads, a heat conducting rod is fixed on the lower end face of the brake shoe and is arranged right below the heat conducting holes, and the heat conducting rod is connected with the temperature measuring module.
When the brake, the temperature in the brake drum can rise fast, and the heat conduction hole can in time transmit the temperature for the brake shoe to make the temperature value in the detection brake drum that the temperature measurement module can be quick, make things convenient for data processing module in time to make a feedback, guarantee to drive safety.
Preferably, one end of each of the upper shoe and the lower shoe is hinged to the base plate, the other end of each of the upper shoe and the lower shoe is connected with the driving piece, each driving piece comprises a connecting shaft, a limiting piece and a pushing block used for pushing the brake shoe of the corresponding pushing block, one end of each connecting shaft is fixedly connected with the corresponding pushing block, the limiting pieces are arranged on two sides of the corresponding pushing block and fixed on the connecting shaft, two opposite side faces of the pushing block are first supporting planes which are parallel to each other, the other two opposite sides of the pushing block are second supporting planes which are parallel to each other, the thickness between the two opposite first supporting planes is smaller than the diameter of the limiting piece, the thickness between the two opposite second supporting planes is larger than the diameter of the limiting piece, an arc-shaped guide surface is arranged between the first supporting plane and the second supporting plane on one side, and the first supporting plane is vertically connected with the second supporting plane on the other side.
The driving piece pushes the upper shoe and the lower shoe through rotating the pushing block, and the distance between the first supporting plane and the connecting shaft is different from that between the second supporting plane and the connecting shaft, so that the upper shoe and the lower shoe can be pushed by the pushing block when the driving piece is rotated. In order to push the upper shoe and the lower shoe away smoothly, the first supporting plane and the second supporting plane are in transitional connection through the arc-shaped guide surface, so that good stability of the upper shoe and the lower shoe when being pushed away is guaranteed. The driving strength of the driving piece with the structure is high.
Preferably, the other end of the connecting shaft extends out of the base plate and is fixedly provided with a pull rod connected with a brake pedal; a gasket is fixed on the first supporting plane. The shim can adjust the braking distance between the brake shoe and the brake drum, and the insensitivity or the insensitivity of the brake can be improved by adjusting the thickness of the shim.
A detection method adopting a brake pad thickness detection device is characterized in that when a brake pad is brand new, a brand new initial thickness value T of the brake pad is set 0 Storing the data into a storage module; when the brake pad is braked for the first time, the tension detection device detects the tension value F of the return spring assembly in the stretching state 1 ，F 1 ＝k×x 1 K is the stiffness coefficient of the spring, x 1 The elongation of the return spring assembly during first extension;
when the brake pad is worn and braked, the tension detection device detects the tension value F of the return spring assembly in the stretching state 2 And applying the tension value F 2 Sending to a data processing module, the data processing module passes F 2 ＝k×x 2 Calculate x 2 ，x 2 For the elongation of the return spring assembly, and simultaneously calculating the loss thickness value of the brake pad as x 0 ＝x 2 -x 1 The data processing module is used for measuring the brake pad loss thickness x 0 Storing the data in a storage module;
the data processing module also sends the last calculated brake pad loss thickness data to the display module; when the data processing module calculates the thickness x of the brake pad 0 ＞T 0 And when the data processing module is in a state of 2, the data processing module starts the alarm device, and an alarm signal lamp of the alarm device flickers in the display module.
Due to the adoption of the technical scheme, the invention has the remarkable technical effects that:
a return spring is also arranged on the traditional brake shoe, but only one return spring is arranged on the traditional brake shoe, and the return spring connects the upper shoe and the lower shoe together to play a role in returning. This brake block thickness detection device adds another spring to make last hoof and lower hoof have a spring coupling respectively, install a tension detection device again between last spring and the lower spring, tension detection device can detect out the pulling force value of going up spring or lower spring, and data processing module can calculate the elongation of going up spring or lower spring through the pulling force value often, and data processing module compares newly-measured spring elongation and the spring elongation of first survey and obtains the wearing and tearing volume of brake block. The display screen module can feed back the wearing and tearing volume of the back brake block of once traveling often, and people can master the wearing and tearing condition of brake block often, reduces the degree of difficulty that the driver judges brake block thickness, makes the vehicle travel safelyr.
Drawings
Fig. 1 is a schematic structural view when the brake drum is not mounted in the present invention.
Fig. 2 is a schematic view of the construction of the present invention when the brake drum is installed.
Fig. 3 is a schematic view of the internal structure of the return spring assembly of fig. 1.
Fig. 4 is an external structural view of the return spring assembly of fig. 1.
Fig. 5 is a schematic structural view of the tension detecting device in fig. 3.
Fig. 6 is a schematic view of the structure of the driving member of fig. 2.
The names of the parts indicated by the numerical references in the above figures are as follows: 10-substrate, 11-brake drum, 12-brake shoe, 13-driving piece, 14-return spring subassembly, 15-data processing module, 16-memory module, 17-temperature measurement module, 18-brake block, 121-upper shoe, 122-lower shoe, 131-connecting shaft, 132-spacing piece, 133-ejector block, 134-gasket, 135-pull rod, 141-upper spring, 142-lower spring, 143-tension detection device, 144-sleeve, 181-heat conduction hole, 1331-first supporting plane, 1332-second supporting plane, 1333-arc guide plane, 1431-tension sensor, 1432-fixing seat, 1433-fixing rod, 1434-groove.
Detailed Description
The invention will be described in further detail below with reference to the accompanying figures 1-6 and examples.
Example 1
A brake block thickness detection device for drum brake solves the technical problem that can't carry out accurate real time monitoring to brake block thickness among the prior art, and it can improve vehicle safety of traveling, and the brake block thickness state of real-time display device place brake drum reduces the degree of difficulty that the driver judges brake block thickness, makes the vehicle travel safelyr. The brake pad thickness detection device comprises a substrate 10, a brake drum 11, brake shoes 12, a driving element 13 and a display module arranged in a vehicle, wherein the brake drum 11, the brake shoes 12 and the driving element 13 are all arranged on the substrate 10, the driving element 13 pushes the brake shoes 12 to be in contact with the brake drum 11 for braking, and the driving element 13 can push the brake shoes 12 to be unfolded and to be in friction braking with the brake drum 11 during braking. The brake shoe 12 comprises an upper shoe 121 and a lower shoe 122, and the return spring assemblies 14 are arranged between the two sides of the upper shoe 121 and the lower shoe 122, so that the resilience force of the upper shoe 121 and the lower shoe 122 is improved, the brake shoe 12 can be quickly released when a driver releases the brake, and the abrasion of the brake pad 18 is reduced. The return spring assembly 14 comprises an upper spring 141, a lower spring 142, a tension detection device 143 and a sleeve 144, wherein the upper spring 141, the lower spring 142 and the tension detection device 143 are all installed in the sleeve 144, one end of the upper spring 141 is connected with one end of the tension detection device 143, and the other end of the upper spring 141 is connected with the upper shoe 121; one end of the lower spring 142 is connected with the other end of the tension detection device 143, and the other end of the lower spring 142 is connected with the lower shoe 122; a heat insulation pipe is arranged outside the sleeve 144, the heat insulation pipe is not shown in the figure, a heat insulation cavity is formed between the sleeve 144 and the heat insulation pipe, the heat insulation cavity is filled with EPS heat insulation particles, a data processing module 15 and a storage module 16 are arranged on the sleeve 144 on the heat insulation cavity, the carding processing module 15 and the storage module 16 are both arranged on the sleeve 144 through bolts, a tension detection device 143 is respectively and electrically connected with the storage module 16 and the data processing module 15, the tension detection device 143 sends tension data of an upper spring 141 and a lower spring 142 to the data processing module 15 for processing, the data processing module 15 sends the processed data to the storage module 16 and a display module respectively, the data processing module 15 has a wireless signal transmitting function, the signal transmitting function is stimulation transmitting, and the signal transmitting function can be activated after receiving signals of the tension detection device 143 or the temperature measuring module 17 each time, and sends a signal to the display module after the signal processing is completed.
The display module can directly use the vehicle-mounted power supply to provide electric quantity, and does not need an extra battery or other power supply devices, so that the device has strong portability and later-period installation capability, and is also very simple to install on the existing vehicle.
The thickness detection devices of the plurality of brake pads 18 can simultaneously send signals to the vehicle-mounted display module, and the display module can simultaneously display the thickness condition of the brake pads in each brake wheel in the vehicle.
A return spring is also arranged on the traditional brake shoe, but only one return spring is arranged on the traditional brake shoe, and the return spring connects the upper shoe and the lower shoe together to play a role in returning. The brake pad thickness detection device is additionally provided with another spring, so that the upper shoe 121 and the lower shoe 122 are respectively connected with one spring, a tension detection device 143 is arranged between the upper spring 141 and the lower spring 142, the tension detection device 143 can detect the tension value of the upper spring 141 or the lower spring 142, the data processing module 15 can calculate the elongation of the upper spring 141 or the lower spring 142 at any time through the tension value, and the data processing module 15 compares the newly measured elongation of the spring with the initially measured elongation of the spring to obtain the abrasion loss of the brake pad 18. The display screen module can feed back the abrasion loss of the brake pad 18 after one-time running, people can control the abrasion loss of the brake pad 18 at any time, the difficulty of judging the thickness of the brake pad by a driver is reduced, and the vehicle can run more safely.
The tension detection device 143 includes a tension sensor 1431 and a fixing base 1432 made of a heat-resistant material, fixing rods 1433 are installed between the two sides of the sleeve 144 and the fixing base 1432, a channel through which a power supply line passes is arranged on the fixing rod 1433, two ends of the fixing base 1432 are respectively connected with the upper spring 141 and the lower spring 142, a groove 1434 is arranged on the fixing base 1432, the groove 1434 is arranged between the two fixing rods 1433, and the tension sensor 1431 is installed in the groove 1434. The tension detection device 143 is configured to detect a tension value of the upper spring 141 or the lower spring 142, so as to facilitate the data processing module 15 to calculate the wear loss of the brake pad 18. The fixing base 1432 made of the heat-resistant material can better protect the tension sensor 1431, and the tension sensor 1431 is fixed in the groove 1434 of the fixing base 1432, so that the fixing between the tension sensor 1431 and the fixing base is firm and not easy to loosen. The fixing seat 1432 is further configured to fix the sleeve 144, so that the upper spring 141 and the lower spring 142 can be suspended in the sleeve 144, and the upper spring 141 and the lower spring 142 are conveniently stretched to avoid interference between them.
Brake block thickness detection device is still including installing the alarm device in the driver's cabin, be fixed with the temperature measurement module 17 that is used for detecting brake shoe 12 temperature value on the sleeve pipe 144, temperature measurement module 17 respectively with data processing module 15 and storage module 16 electric connection, temperature measurement module 17 sends the temperature data who detects for data processing module 15, data processing module 15 is with data transmission storage module 16 and the display module after handling, data processing module 15 opens and stops through the data control alarm device after handling. The driver is not concerned about the wearing capacity of the brake pad, but can be reminded to replace the brake pad obviously through the alarm device due to different personal habits, so that the driver is prevented from forgetting, and the safety of automobile braking is improved. Meanwhile, the sleeve 144 is also provided with the temperature measuring module 17, the influence of the temperature in the brake drum 11 on the braking effect of the brake pad 18 cannot be ignored, when the temperature exceeds 300 ℃, the brake of the brake drum 11 has a heat fading phenomenon, and the brake drum 11 also generates deformation during braking, so that the braking effect is seriously influenced. In addition, when the temperature of the brake drum 11 is too high, grease in the hub bearing may melt, resulting in failure of the hub bearing. In order to detect the working state of the brake pad 18, the temperature measuring device 17 installed on the surface of the return spring assembly 14 can detect the temperature change in the brake drum in real time, and transmit the temperature detection information of each time to the storage module 16 and the data processing module 15 through electrical connection.
The temperature measuring module 17 collects temperature data every 10 seconds, the temperature measuring module 17 is a PT100 temperature sensor, the precision of the temperature sensor of the temperature measuring module 17 is 1 ℃, the detected temperature data are sent to the storage module 16, the latest six temperature data are extracted from the storage module 16 every minute by the data processing module 15 and analyzed, the highest temperature data of the latest minute and the temperature rising curve data of the latest minute are obtained through calculation, the highest temperature data and the latest temperature rising curve data of the latest minute are sent to the display module after the calculation is completed, the display module is an LED display screen, when the received temperature data exceed 200 ℃, the red light of the display module flickers, and the overhigh temperature of the corresponding brake pad 18 is displayed. When the received temperature data exceeds 300 ℃, the red light of the display module flickers and gives an alarm sound, and the display module displays that the temperature of the corresponding brake pad 18 is too high and the vehicle is recommended to stop at the side.
When the temperature rises too fast, the state of the brake pad 18 is abnormal, namely the brake pump is abnormal in return position or the brake drum 12 is possibly provided with impurities, if the difference value of the temperature rise in one minute is more than 30% of that in the normal braking state, the display module flashes red light and displays the braking abnormality, and the temperature rise difference value in the normal braking state needs to be set in the display module according to different vehicles.
The upper shoe 121 and the lower shoe 122 are both fixed with brake pads 18, the brake pads 18 are rivet-connected with the brake shoe 12, the brake pads 18 are provided with heat conducting holes 181, the lower end face of the brake shoe 12 is fixed with heat conducting rods, the heat conducting rods are arranged right below the heat conducting holes 181, and the heat conducting rods are connected with the temperature measuring module 17. When the brake, the temperature in the brake drum 11 can rise fast, and the heat conduction hole 181 can in time transmit the temperature for brake shoe 12 to make the temperature value in the detection brake drum 11 that temperature measurement module 17 can be quick, make things convenient for data processing module 15 in time to make a feedback, guarantee to drive safety.
One end of each of the upper shoe 121 and the lower shoe 122 is hinged to the base plate 10, the other end of each of the upper shoe 121 and the lower shoe 122 is connected to the driving member 13, the driving member 13 includes a connecting shaft 131, a limiting piece 132 and a pushing block 133 for pushing the block brake shoe 12, one end of the connecting shaft 131 is fixedly connected to the pushing block 133, the two sides of the pushing block 133 are respectively provided with the limiting piece 132, the limiting piece 132 is fixed to the connecting shaft 131, two opposite side surfaces of the pushing block 133 are first supporting planes 1331 which are parallel to each other, the other two opposite sides of the pushing block 133 are second supporting planes 1332 which are parallel to each other, the thickness between the two opposite first supporting planes 1331 is smaller than the diameter of the limiting piece 132, the thickness between the two opposite second supporting planes 1332 is larger than the diameter of the limiting piece 132, an arc-shaped guide plane 1333 is arranged between the first supporting plane 1331 and the second supporting plane 1332 on one side, and the first supporting plane 1331 is perpendicularly connected to the second supporting plane 1332 on the other side.
Example 2
Embodiment 2 has substantially the same characteristics as embodiment 1, except that the other end of the connecting shaft 131 extends out of the base plate 10 and is fixed with a pull rod 135 connected with a brake pedal; the spacer 134 is fixed to the first supporting plane 1331.
Example 3
When the brake pad 18 is completely new, the upper shoe 121 and the lower shoe 122 are not extended, the brake pad 18 is not in contact with the brake drum 11, the completely new brake pad 18 leaves a factory and has initial thickness data, and the value T0 of the initial thickness of the completely new brake pad 18 is stored in the storage module 16; when the brake block 18 is braked for the first time, the tension detection device 143 detects the tension value F of the return spring assembly 14 in the stretching state 1 ，F1＝k×x 1 K is the stiffness coefficient of the spring, x 1 Upper shoe 121 and lower shoe 122 are extended outwardly with their respective brake plates 18 for the amount of extension of the return spring assembly 14 when it is first extended, and the return spring assembly 14 hanging from the brake shoe 12 cross bar is extended by the extension of the brake shoe 12, causing friction between the brake plates 18 and the brake drum 11, and slowing the brake drum 11.
When the brake pad 18 is worn and braked, the tension detection device 143 detects the tension value F of the return spring assembly 14 in the stretching state 2 And applying the tension value F 2 Sent to the data processing module 15, the data processing module 15 passes F 2 ＝k×x 2 Calculate x 2 ，x 2 For the extension of the return spring assembly 14, the loss thickness of the brake pad 18 is calculated to be x 0 ＝x 2 -x 1 The data processing module 15 consumes the thickness x of the brake pad 18 0 Data is stored in the storage module 16;
the data processing module 15 also sends the last calculated loss thickness data of the brake pad 18 to the display module; when the data processing module 15 calculates the thickness x of the brake pad 18 0 ＞T 0 And 2, the data processing module 15 starts an alarm device, and an alarm signal lamp of the alarm device flickers in the display module.
Claims (6)
1. The brake pad thickness detection device for the drum brake comprises a base plate (10), a brake drum (11), brake shoes (12), a driving piece (13) and a display module installed in a vehicle, wherein the brake drum (11), the brake shoes (12) and the driving piece (13) are all installed on the base plate (10), the driving piece (13) pushes the brake shoes (12) to be in contact with the brake drum (11) for braking, the brake shoes (12) comprise upper shoes (121) and lower shoes (122), and return spring assemblies (14) are installed between two sides of the upper shoes (121) and two sides of the lower shoes (122); the method is characterized in that: the return spring assembly (14) comprises an upper spring (141), a lower spring (142), a tension detection device (143) and a sleeve (144), the upper spring (141), the lower spring (142) and the tension detection device (143) are all installed in the sleeve (144), one end of the upper spring (141) is connected with one end of the tension detection device (143), and the other end of the upper spring (141) is connected with the upper hoof (121); one end of the lower spring (142) is connected with the other end of the tension detection device (143), and the other end of the lower spring (142) is connected with the lower shoe (122); the sleeve (144) is provided with a data processing module (15) and a storage module (16), the tension detection device (143) is electrically connected with the storage module (16) and the data processing module (15) respectively, the tension detection device (143) sends tension data of the upper spring (141) and the lower spring (142) to the data processing module (15) for processing, and the data processing module (15) sends the processed data to the storage module (16) and the display module respectively;
the device also comprises an alarm device arranged in the cab; the brake pad (18) is fixed on the upper shoe (121) and the lower shoe (122);
when the brake pad (18) is brand new, the original thickness value T of the brake pad (18) is brand new 0 Stored in a storage module (16); when the brake pad (18) is braked for the first time, the tension detection device (143) detects the tension value F of the return spring assembly (14) in the stretching state 1 ，F 1 ＝k×x 1 K is the stiffness coefficient of the spring, x 1 Is the elongation of the return spring assembly (14) when the return spring assembly is stretched for the first time;
when the brake pad (18) is worn and braked, the tension detection device (143) detects the tension value F of the return spring assembly (14) in the stretching state 2 And applying the tensile force value F 2 Sending to a data processing module (15), the data processing module (15) passing through F 2 ＝k×x 2 Calculate x 2 ，x 2 The loss of the brake pad (18) is calculated for the extension of the return spring assembly (14)Thickness value of x 0 ＝x 2 -x 1 The data processing module (15) loses the thickness x of the brake pad (18) 0 Data is stored in a storage module (16);
the data processing module (15) also sends the last calculated loss thickness data of the brake pad (18) to the display module; when the data processing module (15) calculates the thickness x of the brake pad (18) 0 ＞T 0 And/2, the data processing module (15) starts an alarm device, and an alarm signal lamp of the alarm device flashes in the display module.
2. The brake pad thickness detecting device for a drum brake according to claim 1, characterized in that: tension detection device (143) are including fixing base (1432) that tension sensor (1431) and heat-resisting material made, dead lever (1433) are all installed between sleeve pipe (144) and fixing base (1432) both sides, be equipped with the passageway that the power supply line passed through on dead lever (1433), fixing base (1432) both ends are connected with last spring (141) and lower spring (142) respectively, be equipped with recess (1434) on fixing base (1432), recess (1434) are established between two dead levers (1433), tension sensor (1431) is installed in recess (1434).
3. The brake pad thickness detecting device for a drum brake according to claim 1, characterized in that: be fixed with temperature measurement module (17) that are used for detecting brake shoe (12) temperature value on sleeve pipe (144), temperature measurement module (17) respectively with data processing module (15) and storage module (16) electric connection, temperature measurement module (17) give data processing module (15) with the temperature data transmission who detects, data processing module (15) data transmission storage module (16) and display module after will handling, data processing module (15) open through the data control alarm device after handling and stop.
4. The brake pad thickness detecting device for a drum brake according to claim 3, wherein: the brake block (18) is provided with a heat conduction hole (181), the lower end face of the brake shoe (12) is fixed with a heat conduction rod, the heat conduction rod is arranged right below the heat conduction hole (181), and the heat conduction rod is connected with the temperature measurement module (17).
5. The brake pad thickness detecting device for a drum brake according to claim 3, characterized in that: one end of each of the upper shoe (121) and the lower shoe (122) is hinged on the base plate (10), the other end of each of the upper shoe (121) and the lower shoe (122) is connected with the driving part (13) respectively, the driving part (13) comprises a connecting shaft (131), a limiting sheet (132) and a push block (133) used for pushing the brake shoe (12), one end of the connecting shaft (131) is fixedly connected with the push block (133), the two sides of the push block (133) are both provided with the limiting sheets (132), the limiting sheets (132) are fixed on the connecting shaft (131), the two opposite side surfaces of the push block (133) are first supporting planes (1331) which are parallel to each other, the other two opposite sides of the push block (133) are second supporting planes (1332) which are parallel to each other, the thickness between the two opposite first supporting planes (1331) is smaller than the diameter of the limiting sheet (132), the thickness of the two opposite second supporting planes (1332) is larger than the diameter of the limiting sheet (132), and a guide surface (3) is arranged between the first supporting plane (1331) and the second supporting plane (2) on one side, the first support plane (1331) is perpendicularly connected to the second support plane (1332) on the other side.
6. The brake pad thickness detecting device for a drum brake according to claim 5, wherein: a pull rod (135) connected with a brake pedal is fixed at the other end of the connecting shaft (131) extending out of the base plate (10); a spacer (134) is fixed to the first support plane (1331).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011285511.4A CN112483567B (en) | 2020-11-17 | 2020-11-17 | Brake pad thickness detection device for drum brake and detection method thereof |
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| CN202011285511.4A CN112483567B (en) | 2020-11-17 | 2020-11-17 | Brake pad thickness detection device for drum brake and detection method thereof |
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| CN112483567A CN112483567A (en) | 2021-03-12 |
| CN112483567B true CN112483567B (en) | 2022-09-09 |
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Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5339069A (en) * | 1992-07-01 | 1994-08-16 | Tripen Enterprises Ltd. | Brake monitoring system |
| US6581728B2 (en) * | 2001-02-08 | 2003-06-24 | Volvo Trucks North America, Inc. | Brake shoe proximity sensor |
| FR2824118A1 (en) * | 2001-04-25 | 2002-10-31 | Delphi Tech Inc | DRUM BRAKE AND WEAR DETECTOR FOR SUCH A BRAKE |
| CN203332102U (en) * | 2013-06-17 | 2013-12-11 | 绩溪县徽洋车桥有限责任公司 | Electromobile brake shoe with sensor |
| CN208221437U (en) * | 2018-05-29 | 2018-12-11 | 山东省梁山神力汽车配件有限公司 | A kind of abrasion pre-warning brake block |
| CN210423526U (en) * | 2019-05-31 | 2020-04-28 | 高邮市宏生制动器厂 | Drum brake with abrasion alarming function |
| CN210363795U (en) * | 2019-08-27 | 2020-04-21 | 陕西重型汽车有限公司 | Device for preventing wheel from overheating and firing |
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