Double-step cambered surface coupling type electronic brake pedal

Abstract

The utility model discloses a two-step cambered surface coupling type electronic brake pedal, including base, pedal arm, force lag mechanism and sensor module, base has installation cavity and arc cavity surface, the installation cavity in base is installed to pedal arm, is equipped with the pedal boss part on pedal arm, the pedal boss part has arc surface, and the arc surface of pedal boss part cooperates with the arc cavity surface of base, the first friction piece is installed on the arc surface of pedal boss part, force lag mechanism includes force lag rod and second friction piece, force lag rod has force lag boss part, and the force lag boss part has arc surface, and the arc surface of force lag boss part cooperates with the arc cavity surface of base, and the second friction piece is installed on the arc surface of force lag boss part, pedal arm rotates, can drive force lag rod to rotate, sensor module is installed on the base, can respond the rotation of pedal arm, the utility model discloses can realize the nonlinear friction characteristic of low resistance in light treading stage, high resistance in heavy treading stage, can effectively simulate the real foot feeling of hydraulic brake pedal.

Description

Technical Field

[0001] This utility model relates to the field of automotive component technology, and in particular to a double-arc coupling electronic brake pedal. Background Technology

[0002] Traditional braking systems use a vacuum booster to convert the force applied to the brake pedal into hydraulic pressure, which drives hydraulic fluid to provide braking force to the brake pads. With the development of vehicle electrification and intelligence, and the trend towards automated driving, the maturity and industry penetration of electronic braking systems are rapidly increasing. Compared to traditional braking systems, electronic braking systems do not require boosters or hydraulic systems, saving space, reducing vehicle weight, shortening braking reaction time, significantly reducing braking distance, and offering significant safety advantages. They also facilitate the integration of electronic parking brakes, anti-lock braking systems, and electronic brakeforce distribution.

[0003] The brake pedal, or brake pedal, in a braking system is used to decelerate and stop a vehicle. It is one of the five major control components in a car and is used very frequently. How well a driver controls the brake pedal directly affects driving safety. In an electronic braking system, the electronic brake pedal converts the driver's braking intention into an electrical signal through the force and travel of the pedal, which is then transmitted to the ECU (Electronic Control Unit). The ECU then controls the mechanical components to achieve braking.

[0004] Existing electronic brake pedals generally use a pivot-type connection structure, which faces the following technical bottlenecks in terms of force feedback realism and space efficiency: First, the design relying on the pivot-integrated friction pad presents a fundamental contradiction between space and force hysteresis effect—small pivots result in weak force hysteresis torque and a vague foot feel due to insufficient friction area, while large pivots, although they can increase torque, encroach on the pedal arm's movement space, making the assembly bulky. There is an urgent need for a compact, high-torque hysteresis structure that is not limited by pivot size. Second, traditional designs rely on 360° continuous friction between the friction pad and the pivot, and their force-displacement curve has a linear characteristic: drag resistance is generated in the initial stage (free travel), which does not match the gentle feeling of the initial stage of traditional hydraulic brakes; the resistance increment is insufficient when the braking force is established in the final stage, lacking the solid feedback of "pressing it all the way down". Utility Model Content

[0005] To solve the above-mentioned technical problems, the purpose of this utility model is to provide a two-stage arc-coupling electronic brake pedal, which replaces the traditional rotating shaft structure by directly sliding coupling the arc-shaped cavity surface and the friction plate, and achieves nonlinear friction characteristics of low resistance in the light pressing stage and high resistance in the heavy pressing stage through staged friction, which can effectively simulate the real foot feel of a hydraulic brake pedal.

[0006] To achieve the above-mentioned technical objectives and effects, this utility model is implemented through the following technical solution: A two-stage arc-coupling electronic brake pedal includes a base, a pedal arm, a force hysteresis mechanism, and a sensor module; The base has a mounting cavity and an arc-shaped cavity surface; The pedal arm is installed in the mounting cavity of the base, and the pedal arm is provided with a pedal boss, the pedal boss having an arc-shaped surface, the arc-shaped surface of the pedal boss engaging with the arc-shaped cavity surface of the base; a first friction plate is installed on the arc-shaped surface of the pedal boss of the pedal arm. The force lag mechanism includes a force lag rod and a second friction plate; the force lag rod is installed below the pedal arm; the force lag rod has a force lag boss, the force lag boss has an arc-shaped surface, and the arc-shaped surface of the force lag boss mates with the arc-shaped cavity surface of the base; the second friction plate is installed on the arc-shaped surface of the force lag boss of the force lag rod. The rotation of the pedal arm can drive the force-locking rod to rotate; The sensor module is mounted on the base and is capable of sensing the rotation of the pedal arm; the sensor module is connected to the ECU control unit.

[0007] Furthermore, a first spring seat is installed on the base, a second spring seat is installed below the force-locking rod and above the first spring seat, a first spring is installed between the force-locking rod and the first spring seat, a second spring is installed between the second spring seat and the base, and a third spring is installed between the force-locking rod and the second spring seat.

[0008] Furthermore, the force-locking rod has a axial connection protrusion, and the inner side of the pedal arm has a axial connection groove. The force-locking rod is connected to the axial connection groove of the pedal arm through the axial connection protrusion.

[0009] Furthermore, the second spring seat includes a connecting arm and a forward-extending spring seat portion, the connecting arm being connected to the force-locking rod.

[0010] Furthermore, the first friction plate engages with the upper arcuate cavity surface of the base, and the second friction plate engages with the lower arcuate cavity surface of the base.

[0011] Furthermore, the bottom of the pedal arm is provided with an elastic block, which can act on the base after the pedal arm is rotated to its end position.

[0012] Furthermore, a rotor is mounted on the base, and a magnet and a metal plate are also mounted on the rotor. The sensor module is mounted on the base at a position corresponding to the rotor, and the rotor is connected to the pedal arm, which can drive the rotor to rotate.

[0013] Furthermore, the rotor has a disc portion and an extended arm portion, the magnet is mounted on the extended arm portion of the rotor, the metal sheet is mounted on the disc portion of the rotor, the disc portion of the rotor is connected to the base, and the extended arm portion is connected to the pedal arm.

[0014] Furthermore, the sensor module includes a sensor body, a printed circuit board, and a sensor cover plate. The printed circuit board is equipped with a Hall sensor and an inductive sensor. When the rotor rotates, it drives the magnet and the metal sheet to rotate, causing corresponding changes in the electrical signals of the Hall sensor and the inductive sensor.

[0015] The technical effects of this utility model are as follows: 1. This utility model breaks through the limitations of traditional rotating shaft structures, achieving high torque hysteresis and compact space occupation: By directly sliding and coupling the arc-shaped cavity surface with the friction plate, the rotating shaft friction structure is replaced, ensuring a high friction torque while maintaining spatial control, thus resolving the contradiction of "insufficient torque for small rotating shafts and bulky space for large rotating shafts". The pedal arm, force lever, and base are assembled through a nested arc surface, which is more suitable for the compact layout requirements of electric vehicle chassis.

[0016] 2. This utility model, through a two-stage design (independent linkage between the pedal arm and the force-locking rod) combined with the cooperation of the arc-shaped cavity surface and the friction plate, accurately simulates the feel of a hydraulic brake pedal through a stepped friction mechanism: Initial light pressure: Only the first friction plate of the pedal arm contacts the arc-shaped cavity surface of the base, resulting in small frictional torque and weak resistance, restoring the "gentle feeling" of the initial stage of hydraulic braking; During the deep pressing phase: the pedal arm drives the power latch, and its second friction plate couples with the arc-shaped cavity surface of the base, resulting in a sharp increase in frictional torque and providing a solid feedback of "pressing all the way down". Realistic pedal feel curve: The resistance increases in a stepwise manner with the pedal travel (not a traditional linear increase), which closely matches the force-displacement curve of the hydraulic braking system, providing a solid feedback when "pressing all the way down", simulating the firm pedal feel at the end of the hydraulic braking process.

[0017] 3. This utility model adopts an arc-shaped surface structure coupling, which can reduce the wear of the rotating shaft in the traditional design (traditional rotating shafts are prone to failure), and the friction plate can be replaced, thereby extending the service life. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the electronic brake pedal of this utility model.

[0019] Figures 2 to 5 This is a partial structural diagram of the electronic brake pedal of this utility model.

[0020] Figure 6 This is a schematic diagram of the base in the electronic brake pedal of this utility model.

[0021] Figure 7 This is a schematic diagram of the pedal arm in the electronic brake pedal of this utility model.

[0022] Figure 8 This is a schematic diagram of the force-locking lever in the electronic brake pedal of this utility model.

[0023] Figure 9 This is a schematic diagram of the structure of the second spring seat in the electronic brake pedal of this utility model.

[0024] Figure 10 This is a schematic diagram of the rotor structure in the electronic brake pedal of this utility model.

[0025] In the diagram, 1: base, 101: mounting cavity, 102: arc-shaped cavity surface, 103: arc-shaped opening; 2: pedal arm, 201: pedal boss, 202: shaft connection groove; 3: force-locking rod, 301: force-locking boss, 302: shaft connection protrusion; 4: first friction plate; 5: second friction plate; 6: first spring seat; 7: second spring seat, 701: connecting arm, 702: spring seat; 8: first spring; 9: second spring; 10: third spring; 11: rotor, 1101: disc part, 1102: protruding arm part; 12: magnet; 13: metal sheet; 14: sensor module; 15: elastic block. Detailed Implementation

[0026] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0027] like Figures 1 to 10 A preferred embodiment of a two-stage arc-coupling electronic brake pedal is shown, which includes a base 1, a pedal arm 2, a force lag mechanism, and a sensor module 14.

[0028] The base 1 has a mounting cavity 101 and an arc-shaped cavity surface 102.

[0029] The pedal arm 2 is installed in the mounting cavity 101 of the base 1, and the rear end of the pedal arm 2 is provided with a pedal boss 201. The pedal boss 201 has an arc-shaped surface, and the arc-shaped surface of the pedal boss 201 cooperates with the arc-shaped cavity surface 102 on the upper part of the base 1. A first friction plate 4 is installed on the arc-shaped surface of the pedal boss 201 of the pedal arm 2. When the first friction plate 4 rotates, friction is generated between the first friction plate 4 and the arc-shaped cavity surface 102 of the base 1.

[0030] The force-locking mechanism includes a force-locking rod 3 and a second friction plate 5. The upper side of the force-locking rod 3 has a shaft-connecting protrusion 302, and the inner side of the pedal arm 2 has a shaft-connecting groove 202. The force-locking rod 3 is connected to the lower part of the pedal arm 2 through the engagement of the shaft-connecting protrusion 302 and the shaft-connecting groove 202. When the pedal arm 2 rotates, it can drive the force-locking rod 3 to rotate. The rear end of the force-locking rod 3 has a force-locking boss 301, which has an arc-shaped surface. The arc-shaped surface of the force-locking boss 301 engages with the arc-shaped cavity surface 102 at the lower part of the base 1. The second friction plate 5 is installed on the arc-shaped surface of the force-locking boss 301 of the force-locking rod 3. Friction is generated between the second friction plate 5 and the arc-shaped cavity surface 102 of the base 1 when the second friction plate 5 rotates.

[0031] Both the first friction plate 4 and the second friction plate 5 are arc-shaped segments.

[0032] A first spring seat 6 is mounted on the base 1, and a second spring seat 7 is mounted below the force-locking rod 3 and above the first spring seat 6. The second spring seat 7 includes a connecting arm 701 and a forward-extending spring seat portion 702, with the connecting arm 701 connected to the force-locking rod 3. A first spring 8 is mounted between the force-locking rod 3 and the first spring seat 6, a second spring 9 is mounted between the spring seat portion 702 of the second spring seat 7 and the base 1, and a third spring 10 is mounted between the force-locking rod 3 and the spring seat portion 702 of the second spring seat 7.

[0033] The bottom of the pedal arm 2 is provided with an elastic block 15. After the pedal arm 2 is rotated to the end position, the elastic block 15 can act on the base 1.

[0034] A rotor 11 is mounted on the base 1. A magnet 12 and a metal sheet 13 are also mounted on the rotor 11. A sensor module 14 is mounted on the base 1 at a position corresponding to the rotor 11. The rotor 11 is connected to the pedal arm 2, which can drive the rotor 11 to rotate.

[0035] Specifically, the rotor 11 has a disc portion 1101 and an extended arm portion 1102. The magnet 12 is mounted on the extended arm portion 1102 of the rotor 11, and the metal sheet 13 is mounted on the disc portion 1101 of the rotor 11. The disc portion 1101 of the rotor 11 is connected to the base 1, and the extended arm portion 1102 of the rotor 11 passes through the arc-shaped opening 103 provided on the base 1 and is connected to the pedal arm 2.

[0036] The sensor module 14 is capable of sensing the rotation of the pedal arm 2; and the sensor module 14 is connected to the ECU control unit. Specifically, the sensor module 14 includes a sensor body, a printed circuit board, and a sensor cover plate. The printed circuit board is equipped with a Hall sensor and an inductive sensor. When the rotor 11 rotates, it drives the magnet 12 and the metal plate 13 to rotate, causing corresponding changes in the electrical signals of the Hall sensor and the inductive sensor.

[0037] The working process of the electronic brake pedal: When the driver begins to press the brake pedal, the action is first applied to the pedal arm 2. In the initial stage (light pressing), the pedal arm 2 begins to rotate within the mounting cavity 101 of the base 1. At this time, the pedal boss 201 at the top of the pedal arm 2 drives the first friction plate 4 on it to slide along the arcuate cavity surface 102 on the upper part of the base 1, generating a slight initial friction force. Simultaneously, the shaft groove 202 on the inner side of the pedal arm 2 drives the shaft protrusion 302 at the upper end of the force lag rod 3 connected thereto, causing the force lag rod 3 to begin to rotate slightly. However, in the initial stage of this stroke, the force lag boss 301 at the bottom of the force lag rod 3 and its second friction plate 5 do not effectively transmit frictional resistance to the arcuate cavity surface 102 on the lower part of the base 1, thus avoiding excessive initial resistance. At this time, the second spring 9 connected between the second spring seat 7 and the base 1 provides a gentle rebound force, giving the driver a familiar feel with a light, slightly free travel, similar to the initial stage of a traditional hydraulic brake. The sensor module 14 can detect this initial rotation angle and transmit the signal to the ECU.

[0038] As the driver continues to increase the pressure on the brake pedal, entering the medium travel phase, the pedal arm 2 drives the first friction plate 4 to continue moving on the arc-shaped cavity surface 102 on the upper part of the base 1, and the friction gradually and steadily increases. More importantly, the pedal arm 2, through its shaft groove 202, significantly rotates the force lag rod 3, so that the force lag boss 301 at the lower part of the force lag rod 3 finally effectively contacts the arc-shaped cavity surface 102 on the lower part of the base 1, and the second friction plate 5 installed on it begins to work. At this moment, the first friction plate 4 and the second friction plate 5 simultaneously slide relative to each other on the two arc-shaped cavity surfaces 102 on the upper and lower parts of the base 1, generating superimposed frictional resistance. The feedback force felt by the brake pedal increases significantly, simulating the process of building pressure in the middle of the hydraulic system. At the same time, the third spring 10 between the force lag rod 3 and the second spring seat 7, as well as the second spring 9 supporting the second spring seat 7, begin to work together to generate a gradually increasing elastic resistance, jointly shaping a smooth and gradual resistance curve and avoiding abrupt changes in resistance.

[0039] When the driver depresses the brake pedal deeply into the final stage of its travel (e.g., near the limit), the pedal arm 2 rotates to its maximum angle. At this point, the sliding contact area and pressure of the first friction pad 4 on the upper arcuate cavity surface 102, and especially the second friction pad 5 on the lower arcuate cavity surface 102, increase significantly, causing a rapid increase in frictional resistance. The first spring 8 between the force lag lever 3 and the base 1 also engages, being compressed or stretched to provide strong rigidity support and additional resistance gain. The third spring 10 may also reach its peak force. These springs, together with the strong resistance generated by the two friction pads on the arcuate surface, make the feedback at the end of the pedal stroke exceptionally firm, heavy, and powerful, clearly conveying the feeling of "braking to the floor" to the driver, simulating the hard feedback at the end of a traditional braking system. Simultaneously, the elastic block 15 at the bottom of the pedal arm 2 contacts the base 1, providing a gentle buffer at the end of the travel. The sensor module 14 accurately captures the positional changes at the end of the stroke, providing the ECU with a crucial deep braking signal.

[0040] When the driver releases the pedal, the entire process begins in reverse. First, the second spring 9, connected to the second spring seat 7 and the base 1, contracts, pulling the connected force-locking rod 3 back through the connecting arm 701 on the second spring seat 7. The restoring force of the third spring 10 also causes the force-locking rod 3 to reset, causing the force-locking boss 301 and the second friction plate 5 to quickly disengage from the strong contact state with the arcuate cavity surface 102 on the lower part of the base 1, reducing the rebound resistance. The first spring 8 also assists in stabilizing this reset process. As the force-locking rod 3 disengages and resets, the pedal arm 2, with reduced friction, slides more easily under the slight contact between its first friction plate 4 and the arcuate cavity surface 102 on the upper part of the base 1. Under the action of slight resistance and residual spring force, the pedal arm 2 and the force-locking rod 3 finally return to their initial positions. The signal of the sensor module 14 also returns to zero, confirming the end of braking to the ECU. The entire reset process is smooth and without lag, preparing for the next braking.

[0041] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

[0042] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A dual-stage arc-coupling electronic brake pedal, characterized in that: Includes base, pedal arm, force lag mechanism and sensor module; The base has a mounting cavity and an arc-shaped cavity surface; The pedal arm is installed in the mounting cavity of the base, and the pedal arm is provided with a pedal boss, the pedal boss having an arc-shaped surface, the arc-shaped surface of the pedal boss engaging with the arc-shaped cavity surface of the base; a first friction plate is installed on the arc-shaped surface of the pedal boss of the pedal arm. The force lag mechanism includes a force lag rod and a second friction plate; the force lag rod is installed below the pedal arm; the force lag rod has a force lag boss, the force lag boss has an arc-shaped surface, and the arc-shaped surface of the force lag boss mates with the arc-shaped cavity surface of the base; the second friction plate is installed on the arc-shaped surface of the force lag boss of the force lag rod. The rotation of the pedal arm can drive the force-locking rod to rotate; The sensor module is mounted on the base and is capable of sensing the rotation of the pedal arm; the sensor module is connected to the ECU control unit.

2. The dual-arc-coupling electronic brake pedal according to claim 1, characterized in that, A first spring seat is installed on the base, a second spring seat is installed below the force-locking rod and above the first spring seat, a first spring is installed between the force-locking rod and the first spring seat, a second spring is installed between the second spring seat and the base, and a third spring is installed between the force-locking rod and the second spring seat.

3. The dual-arc surface coupled electronic brake pedal according to claim 1, characterized in that, The force-locking rod has a axial connection protrusion, and the inner side of the pedal arm has a axial connection groove. The force-locking rod is connected to the axial connection groove of the pedal arm through the axial connection protrusion.

4. A dual-arc-coupling electronic brake pedal according to claim 2, characterized in that, The second spring seat includes a connecting arm and a forward-extending spring seat portion, the connecting arm being connected to the force-locking rod.

5. A dual-arc-coupling electronic brake pedal according to claim 1, characterized in that, The first friction plate engages with the upper arc-shaped cavity surface of the base, and the second friction plate engages with the lower arc-shaped cavity surface of the base.

6. A dual-arc-coupling electronic brake pedal according to claim 1, characterized in that, The bottom of the pedal arm is provided with an elastic block. After the pedal arm is rotated to its final position, the elastic block can act on the base.

7. A dual-arc-coupling electronic brake pedal according to claim 1, characterized in that, A rotor is mounted on the base, and a magnet and a metal plate are also mounted on the rotor. The sensor module is mounted on the base at a position corresponding to the rotor, and the rotor is connected to the pedal arm, which can drive the rotor to rotate.

8. A dual-arc-coupling electronic brake pedal according to claim 7, characterized in that, The rotor has a disc portion and an extended arm portion. The magnet is mounted on the extended arm portion of the rotor, and the metal sheet is mounted on the disc portion of the rotor. The disc portion of the rotor is connected to the base, and the extended arm portion is connected to the pedal arm.

9. A dual-arc-coupling electronic brake pedal according to claim 7, characterized in that, The sensor module includes a sensor body, a printed circuit board, and a sensor cover plate. The printed circuit board is equipped with a Hall sensor and an inductive sensor. When the rotor rotates, it drives the magnet and the metal sheet to rotate, causing corresponding changes in the electrical signals of the Hall sensor and the inductive sensor.

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