Electric parking actuator with brake pad thickness detection function

Abstract

The utility model discloses an electric parking actuator with a brake pad thickness detection function. The electric parking actuator with the brake pad thickness detection function further comprises a pair of electric connectors installed in the electric parking actuator, a conductive assembly arranged in the electric parking actuator in a sliding mode and an alarm device circuit connected with the pair of electric connectors in a conductive mode. When the thickness of the brake pad is reduced to the limit thickness and the pull arm is driven to rotate around the pull arm rotating center for parking when the pull rope moves linearly, the conductive assembly is driven by a lead screw in the lead screw assembly to synchronously and linearly move to the contact conduction position of the pair of electric connectors, and the pair of electric connectors is conducted. And the alarm device is connected to give an alarm. The utility model has the advantages of simple structure, low cost and reliable operation.

Description

Technical Field

[0001] The utility model relates to the technical field of brake pad thickness detection, in particular to an electric parking actuator with the function of detecting the thickness of the brake pad. Background Art

[0002] Brake pads are important components in the braking system of a car and are directly related to the braking effect. In the daily use of the car, brake pads are frequently used for braking, and their braking effect is generated by friction between the brake disc and the drum. When used for a long time, they will be worn out. Therefore, the wear and temperature of the brake pads are directly related to the life safety of the driver. Therefore, being able to monitor the thickness of the brake pads in the brake online and effectively evaluate their remaining service life has become the key to solving the problem.

[0003] See also Figures 1 to 3 The brake pad thickness monitoring method of the transmission is: by adding a metal sheet 1, when the brake pad 3 is seriously worn, the metal sheet 1 rubs against the wheel hub 2 to make a sound to remind the driver that the brake pad 3 needs to be replaced. However, due to various noises such as road noise and chassis friction, the driver in the cab cannot hear the friction sound of the metal sheet 1, and thus cannot replace the brake pad 3 in time, which poses a serious hidden danger to the safety of the vehicle and the driver.

[0004] To this end, China's invention patent application publication number CN117028457A discloses a drum-type wire-controlled parking actuator with an alarm function device, comprising an upper housing, a screw assembly, a magnet, a reed switch, a reed switch wiring harness, a lower housing, a motor worm assembly, a worm gear bearing assembly, a disc spring seat, a disc spring assembly, a thrust bearing, a cable assembly, and a dust cover, especially a drum-type wire-controlled parking actuator with an alarm function device suitable for use in new energy smart vehicles. The drum-type wire-controlled parking actuator with an alarm function device of the present invention is installed on a drum brake and used in conjunction with a vehicle sound and light alarm device to realize the alarm function. During normal operation, the reed switch is open circuit. When the friction plate of the drum brake is worn, the stroke of the screw assembly increases. When the friction plate is worn to the limit, the screw assembly runs with the magnet to the vicinity of the reed switch, the reed switch is turned on, and the sound and light alarm device works. After the drum brake is replaced with a new friction plate, the screw assembly is reset and the alarm is released.

[0005] Chinese invention patent application publication number CN105822706A discloses a brake pad wear alarm method and device, wherein the brake pad wear alarm method includes: detecting the distance between the brake pad and the brake disc by a sensor to obtain a measured distance; analyzing the degree of brake pad wear based on the obtained measured distance; and sending an alarm signal based on the degree of brake pad wear. According to the technical solution provided by the present invention, the user can easily know the brake pad wear without checking the brake pad, so as to replace the brake pad in time, which improves the convenience of obtaining the brake pad wear and avoids the potential driving safety hazards caused by the thickness of the brake pad being too thin. This patent sets the sensor inside the brake pad, which increases the cost of the brake pad.

[0006] China invention patent application publication number CN114838071A discloses a brake pad wear online monitoring and brake pad life estimation method, according to the braking state of the vehicle under the actual road conditions, taking into account the chemical reaction of the brake pad under the influence of high temperature in the actual braking process, combining the chemical reaction rate constant with the quantitative calculation formula of material wear, by monitoring the temperature of the brake pad, the hydraulic oil pressure of the brake pad, the real-time speed of the vehicle, the braking time and the real-time wear of the brake pad, analyzing the wear evolution characteristics of the brake pad, thereby predicting the remaining life of the brake pad and providing temperature and wear warning in time. The method of the present invention is simple and has higher monitoring accuracy and prediction accuracy, and is applied to the detection of the remaining service life of the brake pad, which greatly improves the driving safety of the vehicle. However, it is necessary to evaluate the remaining life of the brake pad in real time according to the real-time wear of the brake pad, the temperature of the brake pad, the speed of the vehicle and the hydraulic oil pressure data of the brake pad, and the analysis method is complicated. In addition, it is necessary to fix a plurality of temperature sensors and a detection rod of a resistive sensor on the surface of each brake pad facing the brake disc, which also increases the cost of the brake pad.

[0007] China invention patent application publication number CN116717555A discloses a safety analysis method and system based on brake pad wear and temperature monitoring, wherein the method includes: when outputting the monitoring warning of the brake pad, synchronously outputting the safety analysis inquiry; when receiving the user's positive feedback on the safety analysis inquiry, outputting the preset analysis data acquisition interface; receiving the first analysis data collected by the user based on the analysis data acquisition interface; obtaining the monitoring data of the brake pad wear and temperature as the second analysis data; based on the first analysis data and the second analysis data, determining the analysis result and outputting it. The safety analysis method based on brake pad wear and temperature monitoring of the present invention can realize the analysis result adapted to the current situation according to the current situation input by the user, and provide data support for the user's decision. The wear and temperature detection of the patent can adopt a wear and temperature sensor assembly, the wear and temperature sensor device is fixed on the brake shoe, and the temperature sensor is adjacent to the brake pad to monitor the brake drum temperature in real time. The structure is complex and the cost is high. Utility Model Content

[0008] The technical problem to be solved by the utility model is to provide an electric parking actuator with a simple detection method and low cost and a brake pad thickness detection function in view of the problems of complex analysis method and high cost in the existing brake pad thickness monitoring method.

[0009] The technical problem to be solved by the utility model can be achieved through the following technical solutions:

[0010] An electric parking actuator with a function of detecting the thickness of a brake pad, comprising an electric parking actuator, which converts the rotational motion of a worm gear assembly into the linear motion of a screw assembly, the linear motion of the screw assembly drives the linear motion of a cable, and the linear motion of the cable drives a pull arm to rotate around a rotation center of the pull arm to park the vehicle; it is characterized in that it also includes a pair of electrical connectors installed in the electric parking actuator and a conductive component slidably configured in the electric parking actuator and an alarm device circuit conductively connected to the pair of electrical connectors; when the thickness of the brake pad is thinned to a limit thickness and the linear motion of the cable drives the pull arm to rotate around the rotation center of the pull arm to park the vehicle, the conductive component is driven by the screw in the screw assembly to synchronously perform linear motion to a contact and conduction position of a pair of electrical connectors, and the pair of electrical connectors are turned on, so that the alarm device circuit is turned on to alarm.

[0011] In a preferred embodiment of the utility model, the conductive component includes a conductive block or sheet slidably configured in the electric parking actuator and a pair of elastic conductive contacts arranged on the conductive block or sheet and conductively connected to the conductive block or sheet. When the conductive component is driven by the screw in the screw assembly to move linearly to a contact and conduction position of a pair of electrical connectors, the pair of elastic conductive contacts are respectively contacted and conducted with a pair of electrical connectors.

[0012] In a preferred embodiment of the utility model, the alarm device circuit includes a pair of lead wires and an alarm device with a power supply connected to the pair of lead wires, one end of the pair of lead wires is conductively connected to a pair of electrical connectors and leads out to the electric parking actuator, and the other end of the pair of lead wires is conductively connected to the alarm device with a power supply.

[0013] In a preferred embodiment of the utility model, the electric parking actuator includes a housing having an upper cover portion for the conductive component to perform linear motion, the electrical connector is slidably disposed in the upper cover portion, and a pair of lead wires are led out of the upper cover portion.

[0014] In a preferred embodiment of the present invention, a process groove is provided in the upper cover portion to prevent the upper cover portion from shrinking and deforming.

[0015] In a preferred embodiment of the utility model, a guide column is further provided in the upper cover portion, and the conductive block or sheet is slidably arranged on the guide column and linearly slides along the guide column.

[0016] In a preferred embodiment of the present invention, an auxiliary reset spring is further provided between the conductive block or sheet and the upper cover portion.

[0017] In a preferred embodiment of the present utility model, the alarm device with power supply is arranged on the vehicle dashboard or center console.

[0018] Due to the adoption of the above technical solution, the utility model uses the screw assembly of the existing electric parking actuator as the driving source. When the brake pad is thinned, the stroke of the screw assembly when pulling the cable for parking will change. When the brake pad is thinned to a limit thickness, the screw in the screw assembly will drive the conductive assembly to move linearly. When the conductive assembly moves to the position of a pair of electrical connectors, the pair of electrical connectors will be turned on, generating an alarm to notify the driver to replace the brake pads in time. The utility model has the advantages of simple structure, low cost and reliable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of an existing drum brake.

[0020] Figure 2 for Figure 1 AA section view.

[0021] Figure 3 for Figure 1 BB cross-sectional view.

[0022] Figure 4It is a structural schematic diagram of the electric parking actuator with the function of detecting the thickness of the brake pad according to the utility model.

[0023] Figure 5 for Figure 4 AA section view.

[0024] Figure 6 for Figure 4 Side view of.

[0025] Figure 7 for Figure 6 BB cross-sectional view.

[0026] Figure 8 for Figure 7 An enlarged schematic diagram of point I. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings and specific implementations.

[0028] See also Figures 4 to 8 The electric parking actuator with the function of detecting the thickness of the brake pad shown in the figure includes an electric parking actuator 100. The structure and working principle of the electric parking actuator 100 can refer to a wire-controlled drum parking brake system disclosed in Chinese invention patent application publication number CN114750740A, which converts the rotational motion of the worm gear assembly 110 into the linear motion of the screw rod assembly 120. The linear motion of the screw rod assembly 120 drives the linear motion of the cable 130. The linear motion of the cable 130 drives the pull arm 140 to rotate around the rotation center of the pull arm 140 to park.

[0029] The main features of the utility model are: it also includes a pair of electrical connectors 200 fixedly installed in the electric parking actuator 100 and a conductive component 300 slidably installed in the electric parking actuator 100 (of course, the conductive component 300 can also be installed on the screw 121 in the screw assembly 120 by itself, and follow the screw 121 to perform linear motion synchronously) and an alarm device circuit (not shown in the figure) conductively connected to the pair of electrical connectors 200; when the thickness of the brake pad is reduced to the limit thickness and at the same time, the linear motion of the cable 130 drives the pull arm 140 to rotate around the rotation center of the pull arm to park, the conductive component 300 is driven by the screw 121 in the screw assembly 120 (or follows the screw 121 in the screw assembly 120) to synchronously perform linear motion to the contact and conduction position of the pair of electrical connectors 200, and the pair of electrical connectors 200 are turned on, so that the alarm device circuit is connected to alarm. Specifically:

[0030] The conductive component 300 includes a conductive block or sheet 310 and a pair of elastic conductive contacts 320 . The pair of elastic conductive contacts 320 are installed on the conductive block or sheet 310 at intervals.

[0031] The electric parking actuator 100 includes a housing 150, which has an upper cover 151 for a conductive component 300 to move linearly, a pair of electrical connectors 200 installed in the upper cover 151, one end of a pair of lead wires (not shown in the figure) in the alarm device circuit is conductively connected to the pair of electrical connectors 200 and leads out of the upper cover 151, and the other end of the pair of lead wires is conductively connected to an alarm device with a power supply (not shown in the figure). The alarm device with a power supply is arranged on a vehicle dashboard or a center console.

[0032] A process groove 151 a is provided in the upper cover portion 151 to prevent the upper cover portion 151 from shrinking and deforming.

[0033] A guide post 152 is further provided in the upper cover portion 151 . The guide post 152 is integrally designed with the upper cover portion 151 . The conductive block or sheet 310 is slidably disposed on the guide post 152 and slides linearly along the guide post 152 .

[0034] When the thickness of the brake pad is reduced to the limit thickness, the conductive component 300 is driven by the screw 121 in the screw assembly 120 (or follows the screw 121 in the screw assembly 120) to synchronously perform linear motion to the contact and conduction position of the pair of electrical connectors 200, and the pair of elastic conductive contacts 320 are respectively in contact and conduction with the pair of electrical connectors 200. An auxiliary return spring 330 is also provided between the conductive block or sheet 310 and the upper cover 151 to assist the conductive block or sheet 310 to separate from the pair of electrical connectors 200.

Claims

1. An electric parking actuator with a function of detecting the thickness of a brake pad, comprising an electric parking actuator, which converts the rotational motion of a worm gear assembly into the linear motion of a screw assembly, the linear motion of the screw assembly drives the cable to move linearly, and the cable linear motion drives the pull arm to rotate around the rotation center of the pull arm to park; characterized in that: It also includes a pair of electrical connectors installed in the electric parking actuator, a conductive component slidably configured in the electric parking actuator, and an alarm device circuit conductively connected to the pair of electrical connectors; when the brake pad thickness is reduced to a limit thickness and the pull cable linearly moves to drive the pull arm to rotate around the pull arm rotation center for parking, the conductive component is driven by the screw in the screw assembly to synchronously move linearly to the contact and conduction position of the pair of electrical connectors, the pair of electrical connectors are turned on, so that the alarm device circuit is turned on to alarm.

2. The electric parking actuator with brake pad thickness detection function according to claim 1, characterized in that: The conductive component includes a conductive block or sheet slidably configured in the electric parking actuator and a pair of elastic conductive contacts arranged on the conductive block or sheet and conductively connected to the conductive block or sheet. When the conductive component is driven by the lead screw in the lead screw assembly to move linearly to a contact and conduction position of a pair of electrical connectors, the pair of elastic conductive contacts are respectively contacted and conducted with the pair of electrical connectors.

3. The electric parking actuator with brake pad thickness detection function according to claim 2, characterized in that: The alarm device circuit includes a pair of lead wires and an alarm device with a power supply connected to the pair of lead wires, one end of the pair of lead wires is conductively connected to a pair of electrical connectors and leads out the electric parking actuator, and the other end of the pair of lead wires is conductively connected to the alarm device with a power supply.

4. The electric parking actuator with brake pad thickness detection function according to claim 3, characterized in that: The electric parking actuator comprises a housing having an upper cover portion for the conductive component to perform linear motion, the electrical connector is slidably arranged in the upper cover portion, and a pair of lead wires are led out of the upper cover portion.

5. The electric parking actuator with the function of detecting the thickness of the brake pad according to claim 4, characterized in that: A process groove is arranged in the upper cover part to prevent the upper cover part from shrinking and deforming.

6. The electric parking actuator with brake pad thickness detection function according to claim 4, characterized in that: A guide post is also provided in the upper cover portion, and the conductive block or sheet is slidably arranged on the guide post and linearly slides along the guide post.

7. The electric parking actuator with brake pad thickness detection function according to claim 6, characterized in that: An auxiliary return spring is also arranged between the conductive block or sheet and the upper cover portion.

8. The electric parking actuator with the function of detecting the thickness of the brake pad according to any one of claims 3 to 7, characterized in that: The alarm device with power supply is arranged on the vehicle instrument panel or the center console.

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