Electronic hand brake device for vehicle

Abstract

The utility model discloses a kind of electronic handbrake devices for vehicle, belong to handbrake device technical field, including mounting plate, the drive motor is installed in mounting plate side surface, drive motor output end coaxially fixedly connected with driving shaft, the one end of driving shaft away from drive motor is through mounting plate, and coaxially fixedly connected with grooved wheel, brake cable is wound and connected on the grooved wheel;Torque sensor and encoder reading head are installed on the mounting plate, and the torque detection rotating end of torque sensor is coaxially fixedly connected with driving shaft.In the utility model, driving shaft torsion is converted brake cable tension by torque sensor real-time detection, grating encoder accurately detects groove wheel rotation angle to convert take-up and release stroke, pressure sensor real-time perception brake cable offset state, three kinds of sensor signal synchronous feedback to electronic handbrake control module, comprehensive judgment realizes closed-loop control of tension abnormal adjustment, offset early warning, ensure that brake cable tension and stroke are always accurately matched.

Description

Technical Field

[0001] This utility model belongs to the technical field of handbrake devices, and particularly relates to an electronic handbrake device for vehicles. Background Technology

[0002] With the advancement of automotive electrification and intelligence, consumers' demands for convenient vehicle operation and driving safety continue to rise. Electronic parking brakes, as an upgraded alternative to traditional mechanical parking brakes, have become a core standard component of modern automotive braking systems due to their advantages such as effortless operation, flexible spatial layout, and rapid control response. The core working logic of an electronic parking brake is to convert power output from a drive motor into mechanical action via a drive shaft and pulley transmission mechanism, achieving precise winding or release of the brake cable. This, in turn, links with the vehicle's cable brake structure to complete the parking braking or release operation. Its operational stability and control precision directly determine vehicle parking safety, especially in complex conditions such as parking on slopes and frequent start-stop operations. It is crucial for preventing vehicle rollover and protecting braking system components, making it a key device for ensuring vehicle safety in all driving and parking scenarios.

[0003] In existing technologies, basic intelligent control is achieved by using a structure consisting of a motor, reducer, traction wheel, traction rope, tension plate, and gravity sensor. However, this method lacks a precise detection mechanism for the tension and extension stroke of the brake cable, and there is no warning structure for brake cable deviation, which can easily lead to parking failure or excessive wear of the brake cable. Utility Model Content

[0004] The purpose of this invention is to propose an electronic handbrake device for vehicles to solve the problems in traditional technologies where the brake cable lacks a precise detection mechanism for tension and extension stroke, which can easily lead to parking failure or excessive wear of the brake cable.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An electronic parking brake device for vehicles includes a mounting plate, a drive motor mounted on the side of the mounting plate, a drive shaft coaxially fixedly connected to the output end of the drive motor, the end of the drive shaft away from the drive motor passing through the mounting plate and coaxially fixedly connected to a grooved wheel, and a brake cable wound on the grooved wheel.

[0007] A torque sensor and an encoder reading head are mounted on the mounting plate. The torque detection rotating end of the torque sensor is coaxially fixedly connected to the drive shaft to detect the torque transmitted by the drive shaft. A grating code disk is coaxially fixed on the grooved wheel. The grating code disk and the encoder reading head cooperate to form a grating encoder to detect the rotation angle of the grooved wheel.

[0008] Preferably, the mounting plate has a rotating groove through which the drive shaft rotates, a motor mount is mounted on the mounting plate, the drive motor is mounted on the motor mount and fixedly connected to the mounting plate through the motor mount, and a fixed circular plate is coaxially fixedly connected to the end of the grooved wheel away from the drive shaft.

[0009] Preferably, the grooved wheel has an integrally formed wire groove, and a fixing block is fixedly connected to the grooved wheel. The fixing block is located at one end of the wire groove and has a through hole inside. The brake wire is wound inside the wire groove, and its end away from the brake structure is connected to the inside of the through hole of the fixing block.

[0010] Preferably, the end of the brake cable away from the brake cable structure passes through the fixing block and is fixedly connected to a fixing head. The outer diameter of the fixing head is larger than the diameter of the through hole. The fixing head abuts against the fixing block, and an elastic adhesive layer is fixedly connected between the two.

[0011] Preferably, the brake line is welded to the fixing block, the weld is located inside the through hole of the fixing block, and the outer peripheral surface of the weld is in contact with the inner wall of the through hole of the fixing block.

[0012] Preferably, a protective pad is fixedly connected inside the wire groove, the protective pad completely covers the inner bottom surface and side walls of the wire groove, and the surface of the protective pad is in contact with the outer peripheral surface of the brake line.

[0013] Preferably, a guide plate is fixedly connected to the grooved wheel. The guide plate is located on the side of the brake line away from the groove. A sliding groove is provided on the side of the guide plate facing the groove. A sliding frame is connected inside the sliding groove. A guide wheel is rotatably connected inside the sliding frame. An arc-shaped groove adapted to the brake line is provided on the outer circumferential surface of the guide wheel. The guide wheel abuts against the side of the brake line away from the bottom of the groove through the arc-shaped groove.

[0014] Preferably, the sliding frame is slidably connected inside the sliding groove, and a pressure sensor is installed between it and the inside of the sliding groove. The drive motor, torque sensor, grating encoder and pressure sensor are all electrically connected to the electronic handbrake control module. The electronic handbrake control module is integrated into the vehicle system and is used to receive signals from each sensor and control the working state of the drive motor.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. In this utility model, the torque sensor detects the torque of the drive shaft in real time to calculate the brake cable tension, the grating encoder accurately detects the rotation angle of the groove wheel to calculate the extension and retraction stroke, and the pressure sensor senses the brake cable offset in real time. The signals from the three types of sensors are synchronously fed back to the electronic handbrake control module. The comprehensive judgment realizes closed-loop control for abnormal tension adjustment and offset warning, ensuring that the brake cable tension and stroke are always accurately matched, avoiding problems such as parking failure and brake cable damage caused by tension fluctuations or offset, and improving the detection and adjustment accuracy.

[0017] 2. In this utility model, the guide wheel of the guide plate fits with the brake cable through the arc groove, which transforms the sliding friction during the retraction and extension of the brake cable into rolling friction. At the same time, the protective pad also has a buffering effect, effectively reducing wear and abnormal noise caused by vibration and impact.

[0018] 3. In this utility model, the outer diameter of the fixing head is larger than that of the through hole, which can form a physical locking position when the welding cracks. Combined with the vibration anti-loosening effect of the elastic adhesive layer, the safety hazard of the brake cable detachment is completely eliminated, which meets the core requirements of vehicle safety design. Attached Figure Description

[0019] Figure 1 This utility model provides a schematic diagram of the overall structure of an electronic parking brake device for vehicles. Figure 1 ;

[0020] Figure 2 This utility model provides a schematic diagram of the overall structure of an electronic parking brake device for vehicles. Figure 2 ;

[0021] Figure 3 This is a schematic diagram of the rotating groove, drive shaft, and grating encoder structure of an electronic handbrake device for vehicles proposed in this utility model.

[0022] Figure 4 This is a schematic diagram of the fixing head structure of an electronic handbrake device for vehicles proposed in this utility model;

[0023] Figure 5 This is a vertical sectional view of the guide plate of an electronic handbrake device for vehicles proposed in this utility model;

[0024] Figure 6 This is a block diagram of a vehicle electronic handbrake device proposed in this utility model;

[0025] Figure 7 This is a schematic diagram of the fastening bolt structure of an electronic handbrake device for vehicles proposed in this utility model.

[0026] In the diagram: 1 Mounting plate, 2 Rotating groove, 3 Motor base, 4 Drive motor, 5 Drive shaft, 6 Grooved wheel, 7 Fixing block, 8 Guide plate, 9 Fixing round plate, 10 Brake line, 11 Fixing head, 12 Torque sensor, 13 Grating encoder, 131 Grating code disk, 132 Encoder reading head, 14 Electronic handbrake control module, 15 Sliding groove, 16 Sliding frame, 17 Pressure sensor, 18 Guide wheel, 19 Elastic adhesive layer. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0028] Example 1

[0029] Reference Figures 1-4 An electronic handbrake device for vehicles includes a mounting plate 1. A drive motor 4 is mounted on the side of the mounting plate 1. A drive shaft 5 is coaxially fixedly connected to the output end of the drive motor 4. The end of the drive shaft 5 away from the drive motor 4 passes through the mounting plate 1 and is coaxially fixedly connected to a grooved wheel 6. A brake cable 10 is wound on the grooved wheel 6.

[0030] The mounting plate 1 has a rotating groove 2 through which the drive shaft 5 rotates. The mounting plate 1 is equipped with a motor base 3, and the drive motor 4 is mounted on the motor base 3 and is fixedly connected to the mounting plate 1 through the motor base 3.

[0031] The inner wall of the rotating groove 2 is equipped with a wear-resistant bushing to prevent wear from occurring when the drive shaft 5 rotates.

[0032] The end of the grooved wheel 6 away from the drive shaft 5 is coaxially fixedly connected to a fixed circular plate 9, and the fixed circular plate 9 fixes the grooved wheel 6 to the drive shaft 5 by fixing bolts.

[0033] The grooved wheel 6 has an integrally formed wire groove, and a fixing block 7 is fixedly connected to the grooved wheel 6. The fixing block 7 is located at one end of the wire groove and has a through hole inside. The brake wire 10 is wound inside the wire groove, and its end away from the wire brake structure is connected to the inside of the through hole of the fixing block 7.

[0034] The width of the groove is matched with the outer diameter of the brake wire 10, and its depth is greater than the diameter of the brake wire 10, effectively ensuring that the brake wire 10 does not come out when it is wound.

[0035] The fixing block 7 is fixed to the grooved wheel 6. The diameter of its internal through hole is slightly larger than the diameter of the brake line 10, which facilitates the installation of the brake line 10 and ensures the stability after fixing.

[0036] The end of the brake cable 10 away from the brake cable structure passes through the fixing block 7 and is fixedly connected to the fixing head 11. The outer diameter of the fixing head 11 is larger than the diameter of the through hole. The fixing head 11 abuts against the fixing block 7, and the two are fixedly connected by an elastic adhesive layer 19.

[0037] The fixing head 11 is integrally formed with the brake line 10 through a cold forging process, and its end face is chamfered to avoid stress concentration.

[0038] The elastic adhesive layer 19 is made of high-temperature anaerobic adhesive, which can firmly bond the fixing head 11 to the fixing block 7 to prevent vibration from loosening, and can also prevent the brake line 10 from detaching by physically locking it in case of welding failure, forming a double safety guarantee.

[0039] The brake line 10 is welded to the fixing block 7. The weld is located inside the through hole of the fixing block 7, and the outer peripheral surface of the weld is in contact with the inner wall of the through hole of the fixing block 7.

[0040] The welding method uses silver brazing to ensure that the welding strength meets the tension transmission requirements of the brake line 10. The weld is hidden inside the through hole to avoid external dust and moisture corrosion. At the same time, the weld fits in close to the inner wall of the through hole, further improving the connection stability between the fixing block 7 and the brake line 10 and preventing weld cracking caused by excessive local stress.

[0041] A protective pad is fixedly connected inside the wire trough. The protective pad completely covers the inner bottom surface and side walls of the wire trough, and the surface of the protective pad is in contact with the outer peripheral surface of the brake line 10.

[0042] The protective pad is made of polyurethane elastic material, which has both wear resistance and cushioning properties. It effectively reduces the sliding friction between the brake cable 10 and the cable groove when the cable is wound and unwound, thereby reducing the wear rate of the brake cable 10. At the same time, it can absorb the impact force generated by vibration and prevent the brake cable 10 from making abnormal noise due to rigid contact.

[0043] Reference Figure 5 A guide plate 8 is fixedly connected to the grooved wheel 6. The guide plate 8 is located on the side of the brake line 10 away from the groove. A sliding groove 15 is provided on the side of the guide plate 8 facing the groove. A sliding frame 16 is connected inside the sliding groove 15. A guide wheel 18 is rotatably connected inside the sliding frame 16. An arc-shaped groove adapted to the brake line 10 is provided on the outer circumference of the guide wheel 18. The guide wheel 18 abuts against the side of the brake line 10 away from the bottom of the groove through the arc-shaped groove.

[0044] The arc of the arc groove on the guide wheel 18 is perfectly matched with the outer diameter of the brake line 10, which can convert the sliding friction of the brake line 10 into rolling friction, further reducing wear, and at the same time limiting the radial displacement of the brake line 10.

[0045] The sliding frame 16 is slidably connected inside the sliding groove 15, and a pressure sensor 17 is installed between it and the inside of the sliding groove 15.

[0046] The pressure sensor 17 is a miniature piezoresistive sensor, which is clamped between the inner walls of the sliding frame 16 and the sliding groove 15. Both ends of the sensor are in contact with the inner walls of the sliding frame 16 and the sliding groove 15, respectively. When the brake line 10 deviates and squeezes the guide wheel 18, the sliding frame 16 moves along the sliding groove 15 and presses the pressure sensor 17. The sensor converts the pressure signal into an electrical signal to realize the real-time detection of the deviation state of the brake line 10.

[0047] A torque sensor 12 and an encoder reading head 132 are mounted on the mounting plate 1. The torque detection rotating end of the torque sensor 12 is coaxially fixedly connected to the drive shaft 5 and is used to detect the torque transmitted by the drive shaft 5. A grating code disk 131 is coaxially fixed on the grooved wheel 6. The grating code disk 131 and the encoder reading head 132 cooperate to form a grating encoder 13, which is used to detect the rotation angle of the grooved wheel 6.

[0048] The torque sensor 12 has a flange structure, and its housing is fixed to the mounting plate 1 by bolts. The torque detection rotating end is coaxially connected to the drive shaft 5 to accurately calculate the tension of the brake cable 10.

[0049] The grating code disk 131 is a metal incremental code disk, which is coaxially fixed to the grooved wheel 6 by countersunk screws. The encoder reading head 132 is fixed on the mounting plate 1 by a bracket, and the gap between it and the grating code disk 131 is set to ensure the accuracy of the travel detection.

[0050] Reference Figure 6 The drive motor 4, torque sensor 12, grating encoder 13 and pressure sensor 17 are all electrically connected to the electronic handbrake control module 14. The electronic handbrake control module 14 is integrated into the vehicle system and is used to receive signals from each sensor and control the working state of the drive motor 4.

[0051] The electronic handbrake control module 14 has a built-in MCU chip, which stores control parameters such as tension threshold and stroke range. It communicates with the vehicle system via CAN bus. After receiving the tension signal from the torque sensor 12, the stroke signal from the grating encoder 13, and the offset signal from the pressure sensor 17, it makes a comprehensive judgment. When the tension is abnormal, it controls the drive motor 4 to start, stop, or reverse to adjust.

[0052] When the driver issues a parking or release command through the vehicle system, the electronic handbrake control module 14 immediately receives the command and starts the drive motor 4. The drive motor 4 works, and its output drives the grooved wheel 6 to rotate through the drive shaft 5.

[0053] When the grooved wheel 6 rotates, its fixing block 7 rewinds or releases the brake cable 10. When rewinding, the brake cable 10 pulls the vehicle's cable brake structure to complete parking. When releasing, the cable brake structure resets and releases parking.

[0054] Meanwhile, the torque sensor 12 detects the torque transmitted by the drive shaft 5 in real time, the grating code disk 131 rotates with the grooved wheel 6, the encoder reading head 132 reads the value, accurately detects the rotation angle of the grooved wheel 6 and calculates the extension and retraction stroke of the brake cable 10.

[0055] If the brake line 10 deviates, it will squeeze the guide wheel 18, pushing the sliding frame 16 to move along the sliding groove 15, triggering the pressure sensor 17.

[0056] The electronic handbrake control module 14 receives detection signals from the torque sensor 12, the grating encoder 13, and the pressure sensor 17 in real time. If the tension is abnormal, it adjusts the start / stop or forward / reverse rotation of the drive motor 4 to ensure the stable and reliable operation of the electronic handbrake.

[0057] Example 2

[0058] Reference Figure 7 The only difference between this embodiment and Embodiment 1 is the fixing method of the brake line 10 and the fixing block 7. The rest of the structure, connection relationship and working principle are the same as those of Embodiment 1.

[0059] The brake cable 10 is fixedly connected to a screw at one end, which is away from the brake cable structure and passes through the fixing block 7. A fastening bolt is threaded onto the screw and abuts against the fixing block 7.

[0060] The brake cable 10 is fixed to the fixing block 7 by screws and fastening bolts, which facilitates subsequent maintenance or replacement of the brake cable 10.

[0061] Example 3

[0062] Reference Figure 3 and Figure 6 The only difference between this embodiment and Embodiment 1 is the type of the rotation angle detection device for the Geneva 6. The rest of the structure, connection relationship and working principle are the same as those in Embodiment 1.

[0063] Specifically, the grating code disk 131 is replaced with a magnetic code disk, which is coaxially fixed on the end face of the grooved wheel 6 away from the drive shaft 5. The encoder reading head (132) is replaced with a magnetic sensing module, which is fixed on the mounting plate 1 and its sensing end is set towards the annular magnetic ring.

[0064] The magnetic code disk and the magnetic sensitivity detection module work together to form a magnetic encoder, which is used to detect the rotation angle of the grooved wheel 6.

[0065] When the grooved wheel 6 drives the magnetic code disk to rotate synchronously, the magnetic sensing module 134 senses the change in the magnetic field and converts it into an electrical signal, which is transmitted to the electronic handbrake control module 14 to calculate the extension and retraction stroke of the brake cable 10.

[0066] Magnetic encoders are more resistant to dust, oil, and vibration interference, require no additional dust cover, are suitable for complex automotive applications, have a high tolerance for installation gaps, and have lower assembly and mass production calibration costs, further enhancing the practicality of the device.

[0067] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A vehicle electronic parking brake device, comprising a mounting plate (1), characterized in that, A drive motor (4) is mounted on the side of the mounting plate (1). A drive shaft (5) is coaxially fixedly connected to the output end of the drive motor (4). The end of the drive shaft (5) away from the drive motor (4) passes through the mounting plate (1) and is coaxially fixedly connected to a grooved wheel (6). A brake line (10) is wound on the grooved wheel (6). A torque sensor (12) and an encoder reading head (132) are installed on the mounting plate (1). The torque detection rotating end of the torque sensor (12) is coaxially fixedly connected to the drive shaft (5) to detect the torque transmitted by the drive shaft (5). A grating code disk (131) is coaxially fixed on the grooved wheel (6). The grating code disk (131) and the encoder reading head (132) cooperate to form a grating encoder (13) to detect the rotation angle of the grooved wheel (6).

2. The vehicle electronic parking brake device according to claim 1, characterized in that, The mounting plate (1) has a rotating groove (2) through which the drive shaft (5) rotates. A motor seat (3) is mounted on the mounting plate (1). The drive motor (4) is mounted on the motor seat (3) and is fixedly connected to the mounting plate (1) through the motor seat (3). A fixed circular plate (9) is coaxially fixedly connected to one end of the grooved wheel (6) away from the drive shaft (5).

3. The vehicle electronic parking brake device according to claim 1, characterized in that, The grooved wheel (6) has an integrally formed wire groove, and a fixing block (7) is fixedly connected to the grooved wheel (6). The fixing block (7) is located at one end of the wire groove and has a through hole inside. The brake line (10) is wound inside the wire groove, and its end away from the brake structure is connected to the through hole of the fixing block (7).

4. The vehicle electronic parking brake device according to claim 3, characterized in that, The brake cable (10) passes through the fixing block (7) at the end away from the brake cable structure and is fixedly connected to the fixing head (11). The outer diameter of the fixing head (11) is larger than the diameter of the through hole. The fixing head (11) abuts against the fixing block (7) and the two are fixedly connected by an elastic adhesive layer (19).

5. A vehicle electronic parking brake device according to claim 4, characterized in that, The brake line (10) is welded to the fixing block (7), the welding point is located inside the through hole of the fixing block (7), and the outer peripheral surface of the welding point is in contact with the inner wall of the through hole of the fixing block (7).

6. The vehicle electronic parking brake device according to claim 3, characterized in that, A protective pad is fixedly connected inside the wire groove. The protective pad completely covers the inner bottom surface and side walls of the wire groove, and the surface of the protective pad is in contact with the outer peripheral surface of the brake line (10).

7. A vehicle electronic parking brake device according to claim 1, characterized in that, A guide plate (8) is fixedly connected to the grooved wheel (6). The guide plate (8) is located on the side of the brake line (10) away from the groove. A sliding groove (15) is opened on the side of the guide plate (8) facing the groove. A sliding frame (16) is connected inside the sliding groove (15). A guide wheel (18) is rotatably connected inside the sliding frame (16). An arc-shaped groove adapted to the brake line (10) is provided on the outer circumferential surface of the guide wheel (18). The guide wheel (18) abuts against the side of the brake line (10) away from the bottom of the groove through the arc-shaped groove.

8. A vehicle electronic parking brake device according to claim 7, characterized in that, The sliding frame (16) is slidably connected inside the sliding groove (15), and a pressure sensor (17) is installed between it and the inside of the sliding groove (15). The drive motor (4), torque sensor (12), grating encoder (13) and pressure sensor (17) are all electrically connected to the electronic handbrake control module (14). The electronic handbrake control module (14) is integrated into the vehicle system and is used to receive signals from each sensor and control the working state of the drive motor (4).

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