Mechanical control structure of PTS sensor

Abstract

The utility model discloses a mechanical control structure of a PTS sensor, comprising a housing, a circuit board assembly, a cover plate assembly and a motion assembly, the circuit board assembly is installed in the housing, the cover plate assembly is installed above the circuit board assembly, and the cover plate assembly, the circuit board assembly and the housing are connected through fastening screws; the movement assembly is installed in the shell and is assembled with the cover plate assembly in a sliding mode. According to the utility model, the middle driving piece playing a buffering role is arranged between the light touch switch and the motion assembly, so that the light touch switch is prevented from being directly impacted by external force, and meanwhile, the bottom of the driving part is arranged to be an inclined transition structure which gradually transits from the inclined surface to the plane; the top of the middle driving piece is arranged to be the inclined end face in wedge-shaped fit with the bottom of the driving part, so that radial impact on the touch switch at the moment of contact in the moving process is reduced, the service life of the touch switch is effectively prolonged, and accurate output of position signals of the brake pedal is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of PTS sensors, in particular to a mechanical control structure of a PTS sensor. Background Art

[0002] The electronically controlled pneumatic brake system (EBS) controls the service brakes based on the brake pedal signal. Compared with the traditional ABS anti-lock brake system, it has outstanding advantages such as short braking response time and high reliability.

[0003] The EBS system is mainly composed of a foot valve module FBM (integrated pedal position sensor PTS), a single-channel module, an integrated bridge control module and a trailer module. It controls vehicle braking through electronic signals and achieves safer and more efficient braking with more intelligent and precise control. It is a commercial vehicle braking system solution that integrates innovation, safety, reliability and intelligence, and can achieve safer braking.

[0004] Among them, the foot valve module is composed of a traditional service brake valve and a pedal position sensor PTS, and is an important part of the EBS system. When the EBS system works normally, the wheel braking force is calculated and controlled based on the PTS pedal position sensor signal. However, the existing PTS sensor contacts are prone to loosening after long-term use, resulting in the inability to guarantee the circuit conduction effect and the inability to accurately output the displacement signal, which poses certain risks. Summary of the invention

[0005] The technical problem to be solved by the utility model is to provide a mechanical control structure of a PTS sensor, which can accurately control the output of a brake pedal position signal and improve the mechanical service life of the PTS pedal position sensor.

[0006] In order to solve the above technical problems, the technical solutions adopted by the present utility model are as follows.

[0007] A mechanical control structure of a PTS sensor comprises a housing, a circuit board assembly, a cover assembly and a motion assembly, wherein the circuit board assembly is mounted in the housing, the cover assembly is mounted above the circuit board assembly, and the cover assembly, the circuit board assembly and the housing are connected by fastening screws; the circuit board assembly comprises a PCB board, on which a main chip, a capacitor device, a resistor device, a touch switch and a connector are respectively mounted; a switch cover for protecting the touch switch is also mounted on the PCB board, and a center hole and a positioning groove for an intermediate drive member to pass through are provided inside the switch cover; a compression spring is arranged between the intermediate drive member and the touch switch, one end of the compression spring is arranged on the touch switch, and the other end is arranged at the bottom of the intermediate drive member; the motion assembly is mounted in the housing and slidably assembled with the cover assembly, and during the movement, the motion assembly controls the on and off of the touch switch through the intermediate drive member.

[0008] In the mechanical control structure of the above-mentioned PTS sensor, an electrical connector for realizing signal transmission is arranged at the bottom of the shell, and a mounting hole connected to a docking piece is opened on the flange surface at the top of the shell; four fixing columns for mounting a circuit board assembly are arranged inside the shell; a sealing groove is also arranged on the inner side of the flange portion at the top of the shell, and a sealing ring is installed inside the sealing groove.

[0009] In the mechanical control structure of the PTS sensor, one end of the connector is welded on the PCB board, and the other end is installed inside the connector in the housing by integral injection molding.

[0010] The above-mentioned mechanical control structure of the PTS sensor, the cover plate assembly includes a cover plate, four screw support parts are arranged at the bottom of the cover plate, and a threaded through hole is opened in the center of the screw support part; a guide column slidably assembled with the motion assembly is arranged in the center of the cover plate, and the outer side of the guide column and the edge of the cover plate form a limit groove for limiting the movement of the motion assembly.

[0011] The mechanical control structure of the above-mentioned PTS sensor, the moving assembly includes a moving part, a driving part, a magnetic steel part, and a connecting part, the driving part and the magnetic steel part are respectively installed at the bottom of the moving part, the connecting part is arranged at the top of the moving part and is connected to the docking part service brake valve; a guide groove is opened in the center of the moving part for slidingly fitting with a guide column, and the guide column and the guide groove are respectively dovetail structures.

[0012] In the mechanical control structure of the above-mentioned PTS sensor, the bottom of the driving part near the intermediate driving member is arranged as an inclined transition structure that smoothly transitions from an inclined surface to a flat surface, and the top of the intermediate driving member is arranged with an inclined end surface that is wedge-shaped with the driving part.

[0013] In the mechanical control structure of the above-mentioned PTS sensor, a spring mounting seat is also arranged between the magnetic steel part and the bottom end of the moving part, a spring supporting part is also arranged on the cover plate located below the guide column, a return spring is installed between the spring mounting seat and the spring supporting part, one end of the return spring is arranged on the spring supporting part, and the other end is arranged in the through hole in the center of the spring mounting seat.

[0014] In the mechanical control structure of the PTS sensor, the guide groove and the guide column are both made of self-lubricating material.

[0015] In the mechanical control structure of the PTS sensor, the housing, the cover assembly and the motion assembly are respectively made of plastic materials by injection molding.

[0016] Due to the adoption of the above technical scheme, the technical progress achieved by the present invention is as follows.

[0017] The utility model provides a mechanical control structure of a PTS sensor, which avoids the touch switch from being directly subjected to external force impact by arranging an intermediate driving member with a buffering effect between the touch switch and the motion assembly, and at the same time, the bottom of the driving part is arranged as an inclined transition structure which gradually transitions from an inclined surface to a plane, and the top of the intermediate driving member is arranged as an inclined end surface which is wedge-shaped with the bottom of the driving part, thereby reducing the radial impact on the touch switch at the moment of contact during movement, effectively extending the service life of the touch switch, and ensuring the accurate output of the brake pedal position signal.

[0018] The moving parts and guide posts in the utility model are made of self-lubricating plastic, which reduces the friction resistance of the moving parts during movement. At the same time, through the cooperation of the dovetail guide groove and the guide post, the accuracy of the linear motion of the moving parts is improved, ensuring the stability of movement and the accuracy of positioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the specific structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the specific structure of the housing of the utility model;

[0021] Figure 3 It is a schematic diagram of the specific structure of the circuit board assembly of the utility model;

[0022] Figure 4 It is a schematic diagram of the specific structure of the cover plate assembly of the utility model;

[0023] Figure 5 It is a schematic diagram of the specific structure of the motion assembly of the utility model;

[0024] Figure 6 The figure is a schematic diagram of the specific structure of the touch switch of the utility model when it is in working state.

[0025] Wherein: 1. Shell, 11. Electrical connector, 12. Fixing column, 13. Sealing groove, 14. Mounting hole, 2. Circuit board assembly, 21. PCB board, 22. Main chip, 23. Capacitor, 24. Resistor, 25. Touch switch, 26. Switch cover, 27. Intermediate drive, 28. Compression spring, 29. Connector, 3. Cover assembly, 31. Cover, 32. Guide column, 33. Screw support, 34. Spring support, 35. Threaded through hole, 36. Limiting groove, 4. Moving assembly, 41. Moving part, 42. Guide groove, 43. Driving part, 44. Magnetic steel part, 45. Spring mounting seat, 46. Through hole, 47. Connecting part, 5. Reset spring, 6. Sealing ring, 7. Fastening screw. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0027] A mechanical control structure of a PTS sensor, such as Figures 1 to 6 As shown, it includes a shell 1, a circuit board assembly 2, a cover assembly 3, and a motion assembly 4. The circuit board assembly 2 is installed in the shell 1, the cover assembly 3 is installed above the circuit board assembly 2, and the cover assembly 3, the circuit board assembly 2 and the shell 1 are connected by fastening screws 7. The motion assembly 4 is installed in the shell 1 and is slidably assembled with the cover assembly 3 and cooperates with the circuit board assembly 2 to complete the output and conversion of the displacement signal.

[0028] The bottom of the housing 1 is provided with an electrical socket 11. Figure 2 As shown, in order to facilitate the connection of the docking piece to realize signal transmission, a mounting hole 14 connected to the docking piece is opened on the flange surface at the top of the shell.

[0029] Four fixing columns 12 are installed inside the housing 1 , and a cylindrical threaded hole is provided at the center of the fixing column 12 for installing the circuit board assembly 2 .

[0030] A sealing groove 13 is also provided inside the flange portion at the top end of the housing 1, and a sealing ring 6 is installed inside the sealing groove 13 to ensure the sealing between the housing 1 and the service brake valve of the docking piece.

[0031] The circuit board assembly 2 includes a PCB board 21, such as Figure 3 As shown, a main chip 22, a capacitor device 23, a resistor device 24, a touch switch 25, and a connector 29 are mounted on the PCB board 21 respectively.

[0032] One end of the connector 29 is welded to the PCB board 21 , and the other end is installed inside the connector in the housing 1 by integral injection molding.

[0033] A switch cover 26 for protecting the touch switch 25 is also mounted on the PCB board 21 . A center hole and a positioning groove for the intermediate driving member 27 to pass through are provided inside the switch cover 26 .

[0034] A limiting plate is also provided at the bottom of the intermediate driving member 27 to prevent the intermediate driving member 27 from sliding out.

[0035] A compression spring 28 is arranged between the intermediate driving member 27 and the touch switch 25. One end of the compression spring 28 is arranged on the touch switch 25, and the other end is arranged at the bottom of the intermediate driving member 27. The intermediate driving member 27 can prevent the touch switch from directly bearing the external driving force when the touch switch is touched.

[0036] The cover plate assembly 3 includes a cover plate 31, such as Figure 4As shown, four screw support parts 33 are provided at the bottom of the cover plate 31 , and a threaded through hole 35 is opened at the center of the screw support part 33 to facilitate connection with the PCB board 21 and the fixing column 12 through the bolt 7 .

[0037] A guide column 32 slidably fitted with the motion assembly 4 is disposed at the center of the cover plate 31 , and a limiting groove 36 is formed between the outer side of the guide column 32 and the edge of the cover plate 31 , which can limit the movement of the motion assembly 4 .

[0038] The motion assembly 4 includes a moving part 41, a driving part 43, a magnetic steel part 44, and a connecting part 47. Figure 5 As shown, the driving part 43 and the magnetic steel part 44 are respectively installed at the bottom of the moving part 41. The driving part 43 controls the conduction of the touch switch 25 through the intermediate driving part 27 during the movement, so as to control the on and off of the circuit.

[0039] The magnetic steel part 44 cooperates with the main chip 22 to convert the change of magnetic field intensity during the movement of the magnetic steel part 44 into a displacement electrical signal for output.

[0040] The connection part 47 is arranged at the top end of the moving part 41 to facilitate connection with the docking part service brake valve. The connection part 47 can be designed according to the connection part of the docking part service brake valve, which can increase the contact surface and ensure the connection effect.

[0041] A guide groove 42 slidably fitted with the guide post 32 is provided at the center of the moving part 41 . The guide post 32 and the guide groove 42 are dovetail structures respectively, which can ensure the stability of the moving part 41 during movement.

[0042] The guide groove 42 and the guide column 32 are both made of self-lubricating material, which has good wear resistance and prolongs the service life of the parts.

[0043] A spring mounting seat 45 is also provided between the magnetic steel portion 44 and the bottom end of the moving part 41, a spring supporting portion 34 is also provided on the cover plate 31 located below the guide column 32, a return spring 5 is installed between the spring mounting seat 45 and the spring supporting portion 34, one end of the return spring 5 is provided on the spring supporting portion 34, and the other end is provided in a through hole 46 in the center of the spring mounting seat 45.

[0044] The bottom of the driving part 43 close to the intermediate driving member 27 is set as an inclined transition structure, which gradually buffers the transition from the inclined surface to the plane. The top of the intermediate driving member 27 is provided with an inclined end surface that is wedge-shaped with the driving part 43.

[0045] When the moving part 41 moves under the drive of the service brake valve, the driving part 43 moves toward the intermediate driving part 27, and gradually presses the intermediate driving part 27 downward through the bottom inclined transition structure until the horizontal part at the bottom of the driving part 43 contacts the top surface of the intermediate driving part 27, so that the intermediate driving part 27 touches the touch switch 25 to keep the circuit always in the on state.

[0046] At the same time, during the circuit connection process, the magnetic field strength between the magnetic steel part 44 and the main chip 22 changes. The main chip 22 converts the change in magnetic field strength into a displacement electrical signal and outputs it to the electronically controlled pneumatic brake system. The electronically controlled pneumatic brake system calculates and controls the wheel braking force through the position signal.

[0047] Since the moving part will compress the reset spring 5 when it moves, when the external force applied to the moving part 41 is cancelled, the reset spring 5 will drive the moving part 4 to automatically reset, and at the same time, the compression spring 28 will drive the intermediate driving part 27 to cancel the pressing of the touch switch and disconnect the circuit connection.

[0048] The housing 1, cover plate 31 and moving part 41 are respectively made of plastic injection molding, and the molding process is simple, which effectively reduces the mass of the sensor and achieves lightweight and low cost. At the same time, the moving part 41 and the guide column 32 are made of self-lubricating plastic material, which effectively reduces the friction resistance of the moving part, improves product reliability and prolongs service life.

[0049] The utility model provides a mechanical control structure of a PTS sensor, which avoids the touch switch from being directly subjected to external force impact by arranging an intermediate driving member with a buffering effect between the touch switch and the motion assembly, and at the same time, the bottom of the driving part is arranged as an inclined transition structure which gradually transitions from an inclined surface to a plane, and the top of the intermediate driving member is arranged as an inclined end surface which is wedge-shaped with the bottom of the driving part, thereby reducing the radial impact on the touch switch at the moment of contact during movement, effectively extending the service life of the touch switch, and ensuring the accurate output of the brake pedal position signal.

[0050] The moving parts and guide posts in the utility model are made of self-lubricating plastic, which reduces the friction resistance of the moving parts during movement. At the same time, through the cooperation of the dovetail guide groove and the guide post, the accuracy of the linear motion of the moving parts is improved, ensuring the stability of movement and the accuracy of positioning.

Claims

1. A mechanical control structure of a PTS sensor, characterized in that: The invention comprises a housing (1), a circuit board assembly (2), a cover assembly (3), and a motion assembly (4); the circuit board assembly (2) is mounted in the housing (1), the cover assembly (3) is mounted above the circuit board assembly (2), and the cover assembly (3), the circuit board assembly (2), and the housing (1) are connected via fastening screws (7); the circuit board assembly (2) comprises a PCB board (21), on which a main chip (22), a capacitor device (23), a resistor device (24), a touch switch (25), and a connector (29) are respectively mounted; the PCB board (21) is also mounted with A switch cover (26) is provided to protect the touch switch (25), wherein a central hole and a positioning groove are provided inside the switch cover (26) for the intermediate drive member (27) to pass through; a compression spring (28) is provided between the intermediate drive member (27) and the touch switch (25), wherein one end of the compression spring (28) is provided on the touch switch (25) and the other end is provided at the bottom of the intermediate drive member (27); the motion assembly (4) is installed in the housing (1) and is slidably mounted with the cover assembly (3); during the movement, the motion assembly (4) controls the on and off of the touch switch (25) through the intermediate drive member (27).

2. A mechanical control structure of a PTS sensor according to claim 1, characterized in that: The bottom of the shell (1) is provided with an electrical connector (11) for realizing signal transmission, and the flange surface at the top of the shell is provided with a mounting hole (14) connected to a docking piece; four fixing columns (12) for mounting a circuit board assembly (2) are provided inside the shell (1); and a sealing groove (13) is also provided inside the top flange of the shell (1), and a sealing ring (6) is installed inside the sealing groove (13).

3. The mechanical control structure of a PTS sensor according to claim 1, characterized in that: One end of the connector (29) is welded to the PCB board (21), and the other end is installed inside the connector in the housing (1) in an integral injection molding manner.

4. The mechanical control structure of a PTS sensor according to claim 1, characterized in that: The cover plate assembly (3) comprises a cover plate (31), the bottom of which is provided with four screw support portions (33), the center of which is provided with a threaded through hole (35); the center of the cover plate (31) is provided with a guide column (32) for slidingly fitting with the motion assembly (4), the outer side of the guide column (32) and the edge of the cover plate (31) forming a limiting groove (36) for limiting the movement of the motion assembly (4).

5. A mechanical control structure of a PTS sensor according to claim 4, characterized in that: The moving assembly (4) comprises a moving part (41), a driving part (43), a magnetic steel part (44), and a connecting part (47); the driving part (43) and the magnetic steel part (44) are respectively mounted on the bottom of the moving part (41); the connecting part (47) is arranged on the top of the moving part (41) and is connected to a docking part, a service brake valve; a guide groove (42) is provided at the center of the moving part (41) and is slidably fitted with a guide column (32); the guide column (32) and the guide groove (42) are respectively dovetail structures.

6. A mechanical control structure of a PTS sensor according to claim 5, characterized in that: The bottom of the driving part (43) close to the intermediate driving member (27) is provided with an inclined transition structure that smoothly transitions from an inclined surface to a flat surface, and the top of the intermediate driving member (27) is provided with an inclined end surface that is wedge-shaped and matches the driving part (43).

7. The mechanical control structure of a PTS sensor according to claim 5, characterized in that: A spring mounting seat (45) is further provided between the magnetic steel portion (44) and the bottom end of the moving member (41); a spring support portion (34) is further provided on the cover plate (31) located below the guide column (32); a return spring (5) is installed between the spring mounting seat (45) and the spring support portion (34); one end of the return spring (5) is provided on the spring support portion (34), and the other end is provided in a through hole (46) at the center of the spring mounting seat (45).

8. The mechanical control structure of a PTS sensor according to claim 5, characterized in that: The guide groove (42) and the guide column (32) are both made of self-lubricating material.

9. The mechanical control structure of a PTS sensor according to claim 1, characterized in that: The housing (1), the cover plate assembly (3) and the movement assembly (4) are respectively made of plastic material by injection molding.

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