A rigid feedback device for servo force of automotive electronic intelligent booster

Abstract

The present invention relates to a rigid feedback device for the servo force of an automotive electronic intelligent booster, and belongs to the field of automotive braking. It includes a valve body and a retaining ring, a rigid arm is installed in the valve body, supported by a conical spring to maintain horizontal stillness, the conical spring is installed on the valve body seat, the master cylinder push rod is guided by the retaining ring, the master cylinder push rod seat is embedded in the groove of the valve body, and is pressed onto the rigid arm through an elastic retaining ring. The advantage is that the structure is novel, a rigid feedback device for servo force is provided, and it can be installed on an existing intelligent electronic booster, which can significantly improve the response characteristics of the electronic booster, improve the reliability of the system under different working conditions, and increase the service life of the system.

Description

Technical Field

[0001] The invention relates to a feedback device used in the field of automobile braking, in particular to an improvement of an automobile electronic intelligent booster. Background Art

[0002] The electronic intelligent booster used in the braking system is to amplify the input force acting on the brake pedal through the motor. The operating device used for building pressure in the master cylinder of a motor vehicle includes a front and rear housing arranged between the master cylinder and the brake pedal, and a rigid feedback device for the servo force used to build pressure in the master cylinder, an electric motor, a guide device, and a transmission device. In summary, the torsional motion of the motor is converted into the translational motion of the piston through the above mechanisms.

[0003] When the existing electronic booster is working, the input force on the pedal is transmitted to the piston of the brake master cylinder through the valve stem, valve body components, and rubber feedback disc. Figure 8 The rubber feedback disc is made of elastomeric material. The valve body acts on the inner ring of the feedback disc, causing the feedback disc to deform, resulting in a displacement difference between the valve body and the displacement sensor. The sensor sends the detected displacement difference signal to the vehicle electronic control unit. The control unit calculates the torque requirement that the motor should generate, and then converts it into servo force by the transmission and longitudinal transmission device, so that the valve body moves forward along the axial direction, and at the same time, the servo force acts on the outer ring of the feedback disc until the pressure inside and outside the feedback disc is equal, and no more deformation occurs. The displacement difference between the displacement sensor and the valve body is zero, the motor stops rotating, and reaches a balanced state until the push rod force is re-input to break the balanced state, and the motor continues to work. The rubber feedback disc is subjected to three forces in the working process. The first force is the input force of the brake pedal acting on the inner ring of the rubber feedback disc through the valve stem; the second force is the servo force provided by the source motor acting on the outer ring of the rubber feedback disc through the valve body; the third force is the reaction force transmitted back by the hydraulic brake line through the master cylinder push rod.

[0004] However, when the electronic booster is working, the rubber feedback disc will be subjected to a large force, especially when braking frequently at high temperatures, which will cause great damage to the rubber feedback disc. If the contact area between the rubber feedback disc and the valve body is severely damaged, the service life will be reduced, affecting the braking effect of the booster and reducing the braking force. Since the hardness of the rubber material is related to the tensile strength and elasticity, the hardness is proportional to the tensile strength and inversely proportional to the elasticity. The rubber feedback disc must have not only good elasticity, but also high tensile strength. Elasticity is mainly reflected in good feedback characteristics, and high tensile strength is reflected in high performance and life. After long-term use, the rubber will age, the feedback effect will be reduced, and the servo boost effect will be affected. Summary of the invention

[0005] The present invention provides a rigid feedback device for the servo force of an automotive electronic intelligent booster, which significantly improves the response characteristics of the electronic booster, improves the reliability of the system under different working conditions, and increases the service life of the system.

[0006] The technical solution adopted by the present invention is: the bottom of the valve body is used as the first limiting surface, the upper surface of the retaining ring is used as the second limiting surface and the inner surface of the valve body is used as the third limiting surface, the rigid arm 1 and the rigid arm 2 are positioned and installed with the help of the groove 1 and the groove 2 of the valve body, and the rounded position 1 at the bottom of the groove 1 is used as a giving structure when the rigid arm 1 rotates; the rigid arm 2 is positioned and installed with the help of the groove 2, and the rounded position 2 at the bottom of the groove 2 is used as a giving structure when the rigid arm rotates, the rigid arm 1 and the rigid arm 2 are supported by a conical spring to keep them horizontal and still, and the conical spring is installed on the valve body seat, wherein the master cylinder push rod is guided by the retaining ring and the small diameter end passes through the center hole of the master cylinder push rod seat and the center hole surrounded by the rigid arm 1 and the rigid arm 2; the master cylinder push rod seat is embedded in the four grooves of the valve body, and is pressed onto the rigid arm 1 and the rigid arm 2 through an elastic retaining ring, and the elastic retaining ring is crimped below four claws 1, 2, 3 and 4 on the valve body that are distributed at 90 degrees.

[0007] The rigid feedback device of the servo force of the present invention has a symmetrical characteristic. The radial and rotational freedom of rigid arm 1 and rigid arm 2 are limited by two symmetrical positioning grooves, groove 1 and groove 2 on the valve body, so that the layout has a symmetrical characteristic and the force effect is also symmetrical.

[0008] The groove 1 and the groove 2 of the valve body described in the present invention both have T-shaped groove features, are perpendicular to the longitudinal section M1, and the groove 1 and the groove 2 are symmetrical about the two sides of the longitudinal section M1. At the same time, the two grooves 1 and the groove 2 are symmetrical about the longitudinal section M3, respectively matching the boss 1 and the boss 2 of the rigid arm 1 and the rigid arm 2. At the same time, the bottom rounded corner position 1 and the rounded corner position 2 provide a clearance space for the rigid arm to rotate.

[0009] The first, second, third and fourth clearance spaces of the master cylinder push rod seat described in the present invention are evenly arranged at 90 degrees with the longitudinal axis K as the center. The purpose is to design the clearance space and reduce the weight for the smooth passage of the four claws on the valve body during the assembly process. The center hole is located to reserve space for the small-diameter end of the master cylinder push rod to pass through and reduce the weight.

[0010] The large diameter end of the conical spring described in the present invention supports rigid arm one and rigid arm two, and the small diameter end of the lower end is seated on the spring seat, and the spring seat is seated on the retaining ring. Finally, the retaining ring is pressed into the inner wall of the annular groove of the valve body seat to keep the conical spring, the spring seat and the retaining ring moving together with the valve body seat to support the rigid arm to return to its original position.

[0011] The advantages of the present invention are novel structure, providing a rigid feedback device for servo force, and being able to be installed on an existing intelligent electronic booster, which can significantly improve the response characteristics of the electronic booster, improve the reliability of the system under different working conditions, and increase the service life of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a three-dimensional cross-sectional view of the static state of the present invention;

[0013] Figure 2 It is a two-dimensional cross-sectional view of the working state of the present invention;

[0014] Figure 3 is a longitudinal installation cross-sectional view of the assembly in which the present invention is located;

[0015] Figure 4 is a three-dimensional view of the master cylinder push rod seat of the present invention;

[0016] Figure 5 is a three-dimensional diagram of the rigid arm 1 and the rigid arm 2 of the present invention;

[0017] Figure 6 is a longitudinal cross-sectional view of the valve body of the present invention;

[0018] Figure 7 It is a three-dimensional diagram of the assembly process of the valve body, the master cylinder push rod seat and the retaining ring of the present invention;

[0019] Figure 8 It is the force diagram of the rubber reaction plate. Specific embodiments

[0020] The bottom of the valve body 1 is used as the first limiting surface, the upper surface of the retaining ring 9 is used as the second limiting surface, and the inner surface of the valve body 1 is used as the third limiting surface. The rigid arm 15 and the rigid arm 26 are positioned and installed with the help of the groove 1a and the groove 1b of the valve body 1. The rounded corner position 1c at the bottom of the groove 1a serves as a giving structure when the rigid arm 15 rotates; the rigid arm 26 is positioned and installed with the help of the groove 1b, and the rounded corner position 1d at the bottom of the groove 1b serves as a giving structure when the rigid arm 6 rotates. The rigid arm 15 and the rigid arm 26 are supported by the conical spring 2 Keeping horizontal and still, the conical spring 2 is installed on the valve body seat 4, wherein the master cylinder push rod 10 is guided by the retaining ring 9 and the small diameter end 10a passes through the central hole 7c of the master cylinder push rod seat 7 and the central hole e surrounded by the rigid arm 5 one and the rigid arm 2 6; the master cylinder push rod seat 7 is embedded in the four grooves of the valve body 1, and is pressed onto the rigid arm 1 5 and the rigid arm 2 6 through the elastic retaining ring 8, and the elastic retaining ring 8 is pressed under the four claws 1 1e, claw 2 1f, claw 3 1g, and claw 4 1h on the valve body 1, which are distributed at 90 degrees, to prevent the master cylinder push rod seat 7 from moving;

[0021] The rigid feedback device of the servo force has a symmetrical characteristic, and the radial and rotational freedom of the rigid arm 1 5 and the rigid arm 2 6 are limited by two symmetrical positioning grooves, the groove 1 a and the groove 2 1 b on the valve body 1, so that the arrangement has a symmetrical characteristic, and the force effect is also symmetrical;

[0022] The groove 1a and the groove 2 1b of the valve body 1 both have T-shaped groove features, are perpendicular to the longitudinal section M1, and the groove 1a and the groove 2 1b are symmetrical about the longitudinal section M1, and the two grooves 1a and the groove 2 1b are symmetrical about the longitudinal section M3, respectively matching the boss 1 5a and the boss 2 6a of the rigid arm 1 5 and the rigid arm 2 6, and the bottom fillet position 1c and the fillet position 2 1d provide a clearance space for the rigid arm to rotate;

[0023] The first clearance space 7b, the second clearance space 7c, the third clearance space 7d and the fourth clearance space 7f of the master cylinder push rod seat 7 are evenly arranged at 90 degrees with the longitudinal axis K as the center, in order to design the clearance space and reduce the weight for the four claws on the valve body 1 to pass smoothly during the assembly process. The center hole position 7c is a reserved space for the small diameter end 10a of the master cylinder push rod to pass through and reduce the weight;

[0024] The large diameter end of the conical spring 2 supports the rigid arm 1 5 and the rigid arm 2 6, and the small diameter end of the lower end is seated on the spring seat 11, and the spring seat 11 is seated on the retaining ring 3. Finally, the retaining ring 3 is pressed into the inner wall of the annular groove 4b of the valve body seat 4, keeping the conical spring 2, the spring seat 11 and the retaining ring 3 moving together with the valve body seat 4 to support the rigid arm to return to its original position.

[0025] The present invention is further described below in conjunction with the accompanying drawings and working principles.

[0026] See Figure 1 The device uses the valve body 1 as the main load-bearing element, and the rigid arm 1 5 and the rigid arm 2 6 are respectively installed in the groove 1a and the groove 2 1b of the valve body 1, and are longitudinally supported by the valve body seat 4, the retaining ring 3, the spring seat 11 and the conical spring 2. The cylindrical end of the valve body seat 4 is interference fit with the retaining ring 3 through the center hole of the valve body 1, and the elastic retaining ring 8 is pressed under the boss of the valve body 1, and the master cylinder push rod seat 7, the rigid arm 1 5 and the rigid arm 2 6 are pressed against the conical spring 2 to limit the axial degree of freedom.

[0027] See Figure 2When the valve body seat 4 is forced to move forward, the motor provides servo force which is transmitted to the valve body 1 through the speed change mechanism and the support device 13, and acts on the rigid arm 5b point in an upward direction. The master cylinder push rod seat 7 is subjected to the reaction force of the master cylinder hydraulic pressure to press the rigid arm 5 in the opposite direction relative to the valve body 1, and the action point is point a, so that it tilts toward the valve body seat 4 and contacts the valve body seat 4. At this time, the action length from the input force action point c to the support point a is L2, and the action length from the servo force action point b to the support point a is L1, and the power ratio is L2 / L1. At the same time, the symmetrically located rigid arm 2 6 plays the same role, acting at point 6b of the rigid arm 2 and in an upward direction; when the torque generated by the servo force is smaller than the torque generated by the input force on the valve body seat 4, the motor continues to provide the servo force and the feedback device does not work; when the torque generated by the servo force is larger than the torque generated by the valve body seat 4, the valve body seat 4 is pushed back to the initial position of the relative displacement sensor, and the motor stops rotating; when the pedal input force is withdrawn, the valve body seat 4 is separated from the rigid arm 1 5 and the rigid arm 2 6 under the action of the conical spring, and the feedback device does not work.

[0028] See Figure 3 The present invention is installed at the center of the assembly device 1 and can move along the center axis K. The front end is pressed and positioned by the return spring 12, and the rear end is installed on the support device 13.

[0029] See Figure 4 The master cylinder push rod seat 7 is evenly arranged at a 90-degree angle relative to the longitudinal center axis K at position 1 7b, position 2 7d, position 3 7e, and position 4 7f. The purpose of the four arc shapes is to prevent interference with the claws 1e, 1f, 1g, and 1h on the inner wall of the valve body 1 during assembly. The boss 1 7-1, the boss 2 7-2, the boss 3 7-3, and the boss 4 7-4 are embedded in the groove 1 1a, the groove 2 1b, the groove 3 1j, and the groove 4 1k of the valve body 1.

[0030] See Figure 5 The rigid arm 1 5 and the rigid arm 2 6 are two sections arranged symmetrically around the central axis K and about the section M4. E1 and E2 serve as the output force ends of the lever to offset the input force of the valve body seat 4. The rigid arm 1 5 and the rigid arm 2 6 are symmetrical on both sides of the longitudinal section M2. The middle cylindrical hole e is hollowed out and designed to be used for the contact between the main cylinder push rod 10 and the valve body seat 4. The main cylinder push rod 10 needs to pass through the center hole e during the working process.

[0031] See Figure 6In the figure, the groove 1a and the groove 2 1b of the valve body 1 are arranged symmetrically at 180 degrees about the longitudinal center axis K, perpendicular to the longitudinal section M1, the groove 1a and the groove 2 1b are symmetrical about the two sides of the longitudinal section M1, and the groove 1a and the groove 2 1b are also symmetrical about the longitudinal section M3. The lower planes of the groove 1a and the groove 2 1b are lower than the lower planes of the groove 3 1j and the groove 4 1k, and the height difference is the thickness of the rigid arm 1 5. After the rigid arm 1 5 and the rigid arm 2 6 are installed, the two ends of the master cylinder push rod seat 7 sit stably on the rigid arm 1 5 and the rigid arm 2 6, and the other two ends are stably installed in the groove of the valve body 1. The fillet 1c and the fillet 2 1d on the bottom surface of the groove are designed to prevent interference with the rotation action of the rigid arm 1 5 and the rigid arm 2 6. The claw 1 1e, the claw 2 1f, the claw 3 1g and the claw 4 1h on the inner wall of the valve body 1 are evenly arranged at 90 degrees, and the claws are arranged on both sides of the longitudinal section M3.

[0032] See Figure 7 In the figure, the master cylinder push rod seat 7 is pressed by the elastic retaining ring 8, and the elastic retaining ring 8 is pressed into the lower part of the claw 1 1e, the claw 2 1f, the claw 3 1g and the claw 4 1h on the inner wall of the valve body 1 by interference fit.

[0033] How it works

[0034] When the car brakes, the pedal input force pushes the valve stem at a certain speed to drive the valve body seat 4 forward. The forward movement of the valve body seat 4 causes the displacement sensor installed on the valve body 1 to detect the distance the valve body seat 4 moves, and transmits the signal to the motor controller, so that the motor starts to generate servo force. The servo force acts on the point b of the rigid arm 1 5 through the valve body 1. The master cylinder push rod seat 7 is subjected to the reaction force of the master cylinder hydraulic pressure and presses the rigid arm 1 5 in the opposite direction relative to the valve body 1, so that the rigid arm 1 5 is tilted toward the valve body seat 4 with point a as the support point and contacts. Figure 2 Point c is the input force action point on the valve body seat 4, and the rigid arm 2 6 plays the same role. When the torque generated by the servo force is less than the torque generated by the valve body seat 4, the master cylinder push rod seat 7 is always pushed to drive the master cylinder push rod 10 to move forward. As the servo force continues to increase, the action length of the force arm L1 of the servo force remains unchanged, and the length L2 of the input force remains unchanged. When the servo torque gradually increases until it is greater than the torque generated by the input force on the valve body seat 4, the rigid arm 1 5 and the rigid arm 2 6 work together to push the valve body seat 4 back to the initial position of the relative displacement sensor, the motor stops rotating, reaches a balanced state, and the servo force remains unchanged. As the input force increases again, the valve body seat continues to move forward, generating a displacement difference, and the motor rotates to increase the servo force, breaking the static pressure-maintaining state. For this reason, the repeated action causes the booster to produce a follow-up phenomenon, which allows the driver to directly feel the braking strength of the car and a good pedal feel.

[0035] The assembly process is as follows: Figure 1As shown, the valve body 1 is used as the base, and one end of the rigid arm 1 5 and the rigid arm 2 6 are located in the groove of the valve body 1, and the other end is supported by the conical spring 2. The lower end (small diameter end) of the conical spring 2 is located on the spring seat 11. The spring seat 11 is supported by the retaining ring 3 and suspended in the valve body 1, and does not contact the lower surface of the valve body 1. The retaining ring 3 and the valve body seat 4 are interference fit and pressed into the annular groove processed by the valve body seat. The valve body seat 4 moves up and down together with the retaining ring 3, the spring seat 11, and the conical spring 2 through the center hole of the valve body 1. The rigid arm is pressed through the master cylinder push rod seat 7, and the master cylinder push rod seat 7 is finally pressed by the elastic retaining ring 8. The elastic retaining ring 8 is fixed by the four bosses on the valve body 1.

[0036] Compared with the conventional automotive electronic booster rubber feedback disk device, the present invention can improve the reliability and service life of the system.

Claims

1. A rigid feedback device for the servo force of an automotive electronic intelligent booster, characterized in that: The bottom of the valve body is used as the first limiting surface, the upper surface of the retaining ring is used as the second limiting surface and the inner surface of the valve body is used as the third limiting surface. The rigid arm 1 and the rigid arm 2 are positioned and installed with the help of the groove 1 and the groove 2 of the valve body, and the rounded position 1 at the bottom of the groove 1 serves as a giving structure when the rigid arm 1 rotates; the rigid arm 2 is positioned and installed with the help of the groove 2, and the rounded position 2 at the bottom of the groove 2 serves as a giving structure when the rigid arm rotates. The rigid arm 1 and the rigid arm 2 are supported by a conical spring to keep them horizontal and still. The conical spring is installed on the valve body seat, wherein the master cylinder push rod is guided by the retaining ring and the small diameter end passes through the center hole of the master cylinder push rod seat and the center hole surrounded by the rigid arm 1 and the rigid arm 2; the master cylinder push rod seat is embedded in the four grooves of the valve body and is pressed onto the rigid arm 1 and the rigid arm 2 through an elastic retaining ring, and the elastic retaining ring is crimped below four claws 1, 2, 3 and 4 on the valve body that are distributed at 90 degrees.

2. The rigid feedback device for servo force of an automotive electronic intelligent booster according to claim 1, characterized in that: The radial and rotational freedom of the rigid arm 1 and the rigid arm 2 are limited by two symmetrical positioning grooves, the groove 1 and the groove 2 on the valve body, so that the arrangement has a symmetrical characteristic and the force effect is also symmetrical.

3. The rigid feedback device for servo force of an automotive electronic intelligent booster according to claim 2, characterized in that: Groove 1 and groove 2 of the valve body both have T-shaped groove features, which are perpendicular to the longitudinal section M1, and groove 1 and groove 2 are symmetrical about the two sides of the longitudinal section M1. At the same time, groove 1 and groove 2 are symmetrical about the longitudinal section M3, respectively matching the boss 1 and boss 2 of the rigid arm 1 and rigid arm 2. At the same time, the bottom fillet position 1 and fillet position 2 provide space for the rigid arm to rotate.

4. The rigid feedback device for servo force of an automotive electronic intelligent booster according to claim 1, characterized in that: The first, second, third and fourth clearance spaces of the master cylinder push rod seat are evenly arranged at 90 degrees with the longitudinal axis K as the center, so as to smoothly pass through the four claws on the valve body during the assembly process to create clearance space and reduce weight. The center hole is located to reserve space for the small-diameter end of the master cylinder push rod to pass through and reduce weight.

5. The rigid feedback device for servo force of an automotive electronic intelligent booster according to claim 1, characterized in that: The large diameter end of the conical spring supports rigid arm one and rigid arm two, and the small diameter end of the lower end is seated on the spring seat, and the spring seat is seated on the retaining ring. Finally, the retaining ring is pressed into the inner wall of the annular groove of the valve body seat to keep the conical spring, spring seat and retaining ring moving together with the valve body seat to support the rigid arm to return to its original position.

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