CN108099873B

CN108099873B - Brake pedal

Info

Publication number: CN108099873B
Application number: CN201810041507.XA
Authority: CN
Inventors: 石志潇; 仝威; 汤建新; 牛赛赛
Original assignee: Zhejiang Geely Holding Group Co Ltd; Zhejiang Geely New Energy Commercial Vehicle Co Ltd
Current assignee: Zhejiang Geely Holding Group Co Ltd; Zhejiang Geely New Energy Commercial Vehicle Co Ltd
Priority date: 2018-01-16
Filing date: 2018-01-16
Publication date: 2020-10-30
Anticipated expiration: 2038-01-16
Also published as: CN108099873A

Abstract

The invention provides a brake pedal, and relates to the field of vehicle chassis. It includes: the pedal arm is connected with a pedal connecting shaft through a connecting fork arm and a pedal connecting arm, the pedal connecting shaft is connected with the vacuum booster, and the pedal displacement sensor is arranged at the pedal arm; the spring assembly comprises a return spring and an adjusting spring, the return spring is installed at a pedal arm rotating shaft, the adjusting spring is composed of a plurality of sections of springs, the adjusting spring is fixedly installed at a fixing mechanism connected with a second pin shaft, and the second pin shaft is fixed at the pedal arm. The invention solves the problem that the brake pedal in the prior art cannot meet the requirement of a driver on the brake foot feeling, so that the brake efficiency is low.

Description

Brake pedal

Technical Field

The invention relates to the field of vehicle chassis, in particular to a brake pedal.

Background

At present, service braking systems applied to cars are provided with a plurality of servo braking power assisting devices. The servo brake system is formed by adding a power servo device on the basis of a hydraulic brake system, when a driver takes a brake operation, braking force is applied to a brake pedal, the braking force is transmitted to a piston of a brake master cylinder through a rod system, the servo device also acts at the same time, most of braking energy is supplied, and the operation intensity of the driver can be reduced. If the servo fails, the original hydraulic brake can still be applied, and a driver needs larger braking force to meet the requirement of vehicle braking. The servo brake device used in car mainly has two types of vacuum servo and pneumatic servo.

The vacuum booster type servo brake device provides boosting force by additionally installing a vacuum booster between a brake pedal push rod and a brake master cylinder. The vacuum booster provides a boost action requiring a vacuum source. The vacuum source on a common car is provided by an engine in operation, and is convenient. For non-internal combustion engine powered cars, a dedicated vacuum pump is required to provide the vacuum source. The engine is utilized to provide a vacuum source, and two defects are that the vacuum source disappears and the vacuum boosting effect disappears after the engine is flamed out; secondly, the vacuum source provided by the engine is related to the working condition of the engine, and the vacuum boosting effect may be weakened. When the vacuum source is provided by a dedicated vacuum pump, the number of parts on the car increases, the reliability of the car decreases, and the difficulty of arranging the engine compartment and the operating noise increase.

The air pressure booster type servo brake device provides boosting force by additionally arranging an air booster, an engine drives an air compressor through belt transmission to generate air pressure required by the air booster, and accessories such as an air storage cylinder, a control valve, a pressure regulating valve, an air filter, an anti-freezing device, a low-pressure alarm switch, an air pipeline and the like are correspondingly required to be added. The pneumatic booster type servo brake system not only consumes the power of the engine, but also has more parts and larger volume, so that the arrangement of an engine compartment is difficult.

The brake foot feeling is not adjustable, and the feedback brake force is composed of a plurality of components, so that a driver has different brake foot feelings, and the requirement can be met only by developing a novel foot feeling simulation mechanism device.

Disclosure of Invention

The invention aims to provide a brake pedal, which solves the problem that the brake pedal in the prior art cannot meet the requirement of a driver on the brake foot feeling, so that the brake efficiency is low.

In particular, the present invention provides a brake pedal comprising: the pedal displacement sensor comprises a pedal arm (1), wherein the pedal arm (1) is connected with a pedal connecting shaft (6) through a connecting fork arm (2) and a pedal connecting arm (17), the pedal connecting shaft (6) is connected with a vacuum booster, and a pedal displacement sensor (5) is installed at the pedal arm (1);

the spring assembly comprises a return spring (7) and an adjusting spring (9), the return spring (7) is installed at a pedal arm rotating shaft (14), the adjusting spring (9) is composed of a plurality of sections of springs, the adjusting spring (9) is fixedly installed at a fixing mechanism connected with a second pin shaft (13), and the second pin shaft (13) is fixed at the pedal arm (1).

Further, the adjusting spring (9) compresses or rebounds under the state that the pedal arm (1) moves to form pedal feedback force of the pedal arm (1) at different stroke stages.

Furthermore, the pedal displacement sensor (5) is driven to rotate by the pedal arm rotating shaft (14) in the movement process of the pedal arm (1), so that the displacement signal of the pedal arm (1) is converted by the pedal displacement sensor (5), and the displacement signal of the pedal arm (1) is output to a core electronic control unit of the whole vehicle control decision to regulate the braking force.

Furthermore, the adjusting spring (9) is a 3-section spring and comprises a first spring (9-2), a second spring (9-3), a third spring (9-4), a first piston (9-6), a second piston (9-7), a first spring supporting block (9-5) and a second spring supporting block (9-8), the first spring (9-2) is arranged between the first piston (9-6) and the first spring supporting block (9-5), a section of idle stroke (9-1) is arranged between the first piston (9-6) and the first spring supporting block (9-5), the second spring (9-3) is arranged on the outer wall of the second piston (9-7), and a cavity is arranged in the center of the second piston (9-7), the first piston (9-6) is movably arranged in the cavity, the second spring supporting block (9-8) is movably arranged on the outer wall of the second piston (9-7), one end of the second spring supporting block (9-8) wraps the second spring (9-4), and the other end of the second spring supporting block (9-8) and the first spring supporting block (9-5) support the third spring (9-3).

Further, the idle stroke (9-1) is configured to provide braking force to the brake pedal using motor feedback force when the motor feedback force is present, and supplement the braking force to the brake pedal using an ESC boost function when the motor feedback force is absent.

Further, the rigidity, the damping and the stroke of the adjusting spring (9) can be adjusted.

Further, the adjusting spring (9) comprises the first spring (9-2), the second spring (9-3) and the third spring (9-4) with different stiffness.

Further, the stiffness of the first spring (9-2) is smaller than the stiffness of the second spring (9-3), and the stiffness of the second spring (9-3) is smaller than the stiffness of the third spring (9-4).

Further, the number of the adjusting springs (9) is 2.

Furthermore, the pedal connecting shaft (6) is tubular, the inner wall of the tubular shape is provided with a gradual change section (6-1), and two ends of the pedal connecting shaft (6) are provided with rotary supporting blocks (6-2).

According to the brake pedal, the connecting fork arm and the pedal connecting arm are respectively connected with the pedal connecting shaft, the pedal connecting shaft is connected with the vacuum booster, the pedal displacement sensor is arranged at the pedal arm, so that the arrangement range of the brake pedal and the vacuum booster can be enlarged, and the return spring and the adjusting spring (namely the multi-section spring type) are arranged in the arrangement range, so that the brake pedal is a mechanical foot feeling simulation mechanism, the brake foot feeling is adjusted through the adjusting spring and the return spring, the requirement of a driver on the brake foot feeling is met, and the brake efficiency is improved.

Furthermore, the invention also monitors the idle stroke by adjusting the idle stroke at the spring, when the motor feedback force exists, the motor feedback force is adopted to provide the braking force, if the motor feedback force does not exist, the ESC supercharging function supplements the braking force, namely the control force of the motor and the ESC supercharging function can be coordinated through the idle stroke. In addition, the adjusting spring adopts a multi-end damping design, and the braking feeling can be adjusted through the adjusting spring, so that the braking feeling of a driver can be more met, a curve closer to the braking feeling of the driver can be obtained, and the requirements for the braking feeling in different stages can be met.

Drawings

Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. The attached drawings are as follows:

FIG. 1 is a schematic illustration of a brake pedal with mechanical brake feel simulation according to the present invention;

FIG. 2 is a schematic illustration of a brake pedal configuration with mechanical brake feel simulation according to the present invention;

FIG. 3 is a cross-sectional view of a pedal attachment shaft of the brake pedal with mechanical brake feel simulation of the present invention;

fig. 4 is a cross-sectional view of an adjusting spring of the brake pedal with mechanical brake feel simulation of the present invention.

Detailed Description

Fig. 1 is a schematic view of the brake pedal structure of the present invention. Fig. 2 is a schematic view of the brake pedal structure of the present invention. The following description is made with reference to fig. 1 and 2. The brake pedal may be a brake pedal with mechanical brake feel simulation. The brake pedal can comprise a pedal arm 1 connected with a pedal connecting shaft 6 through a connecting yoke 2 and a pedal connecting arm 17, the pedal connecting shaft 6 is connected with a vacuum booster, a pedal displacement sensor 5 is installed at the pedal arm 1, a displacement signal of the pedal arm 1 is converted by the pedal displacement sensor 5 in the motion process of the pedal arm 1, the displacement signal of the pedal arm 1 is output to a core electronic control unit of the whole vehicle control decision, a pedal stroke signal is transmitted in real time, and the brake force is adjusted to achieve the uniqueness of brake foot feeling.

Fig. 4 is a cross-sectional view of an adjusting spring of the brake pedal with mechanical brake feel simulation of the present invention. As shown in fig. 4, the spring includes a return spring 7 and an adjusting spring 9, the adjusting spring 9 is composed of a plurality of sections of springs, the return spring 7 is installed on a pedal arm rotating shaft 14, the adjusting spring 9 is fixedly installed on a pedal arm 1 connecting mechanism and a pedal installing support 4, the adjusting spring 9 compresses or rebounds in the motion state of the pedal arm 1 to form pedal feedback force corresponding to different stages of the stroke of the pedal arm 1, the requirements of different stages of braking on the brake foot feeling are met, and the brake foot feeling can be adjusted through the adjusting spring 9 to better meet the brake feeling of a driver.

Specifically, the adjusting spring 9 is a 3-section spring, and comprises a first spring 9-2, a second spring 9-3, a third spring 9-4, a first piston 9-6, a second piston 9-7, a first spring support block 9-5 and a second spring support block 9-8, the first spring 9-2 is arranged between the first piston 9-6 and the first spring support block 9-5, a section of idle stroke 9-1 is arranged between the first piston 9-6 and the first spring support block 9-5, the second spring (9-3) is arranged on the outer wall of the second piston 9-7, a cavity is arranged in the center of the second piston 9-7, the first piston 9-6 is movably arranged in the cavity, the second spring support block 9-8 is movably arranged on the outer wall of the second piston 9-7, one end of the second spring supporting block 9-8 is wrapped by the second spring 9-4, and the other end of the second spring supporting block 9-8 and the first spring supporting block 9-5 support the third spring 9-3.

In the above embodiment, the idle stroke 9-1 may be configured to provide the braking force to the brake pedal using the motor feedback force when the motor feedback force is present and supplement the braking force to the brake pedal using the ESC boost function when the motor feedback force is absent.

Optionally, the stiffness, damping and stroke of the adjusting spring 9 are adjustable, and the stiffness of the first spring 9-2, the second spring 9-3 and the third spring 9-4 are different from each other. The stiffness of the first spring 9-2 < the stiffness of the second spring 9-3 < the stiffness of the third spring 9-4. Therefore, the idle stroke of the spring can be conveniently adjusted, and the brake foot feeling of a driver is met.

The invention can monitor the idle stroke by adjusting the idle stroke of the spring, when the motor feedback force exists, the motor feedback force is adopted to provide the braking force, if the motor feedback force does not exist, the ESC supercharging function supplements the braking force, namely the control force of the motor and the ESC supercharging function can be coordinated through the idle stroke. In addition, the adjusting spring adopts a multi-end damping design, and the braking feeling can be adjusted through the adjusting spring, so that the braking feeling of a driver can be more met, a curve closer to the braking feeling of the driver can be obtained, and the requirements for the braking feeling in different stages can be met.

Optionally, the number of adjusting springs 9 is 2.

Fig. 3 is a cross-sectional view of a pedal attachment shaft of the brake pedal of the present invention. As shown in fig. 3. The pedal connecting shaft 6 is tubular, the section 6-1 is arranged on the inner wall of the tubular shape, the two ends of the tubular shape are provided with the rotary supporting blocks 6-2, and the pedal connecting shaft 6 adopts the circular groove variable cross section design, so that the pedal connecting shaft can be broken from the variable cross section when the pedal connecting shaft is subjected to a preset shearing force, the leg of a driver is protected, and the requirement of the pedal collapsing is met.

In a specific embodiment, the pedal connecting shaft 6 and the pedal arm 1 can be rotatably fixed on the pedal mounting bracket 4, one end of the pedal connecting shaft 6 is connected with the vacuum booster end connecting arm 15, and the vacuum booster end connecting arm 15 is connected with a vacuum booster ejector rod through a vacuum booster clamping sleeve 16; the other end of the pedal connecting shaft 6 is connected with one end of a pedal arm 1 through a first pin shaft 12 of a pedal connecting arm 17, a connecting fork arm 2 and an anti-falling clamp spring 3, the other end of the pedal arm 1 is provided with a pedal face 11, the pedal arm 1 is provided with a connecting hole and is rotatably fixed on a pedal mounting bracket 4 through a pedal arm rotating shaft 14, the pedal arm rotating shaft 14 is provided with a return spring 7 which has the function of enabling the pedal arm 1 to rebound and return when the pedal arm 1 does not apply pressure, the pedal arm 1 is provided with a second pin shaft 13, the pedal face 11 is stepped, the second pin shaft 13 is pushed by the pedal arm 1 to compress a first adjusting spring 9 and a second adjusting spring 10 to generate feedback force, namely, braking feeling is formed, and proper pedal feeling is finally formed by adjusting the rigidity, damping and stroke of the first adjusting spring 9 and the second adjusting spring 10; the pedal displacement sensor 5 is coaxially connected with the pedal arm rotating shaft 14, the pedal arm 1 drives the pedal displacement sensor 5 to rotate through the pedal arm rotating shaft 14 in the motion process, and through proportion conversion, displacement signals of the pedal arm 1 are output to a core electronic control unit of the whole vehicle control decision, pedal stroke signals are transmitted in real time, and braking force is adjusted to achieve the uniqueness of brake foot feel. A brake light switch 8 is provided near the pedal arm rotation shaft 14 to indicate to the user when braking is generated. The pedal mounting bracket 4 is also provided with a pedal guide bracket 18, the pedal guide bracket is provided with a pedal guide groove, the pedal arm 1 is fixedly provided with a pedal guide pin 19, and the pedal guide pin 19 is matched with the pedal guide groove to play a role of guiding the pedal arm 1 and prevent the pedal arm 1 from inclining and shifting. The pedal connecting shaft 6 adopts a circular groove variable cross section design, can be broken from the variable cross section when being subjected to shearing force, protects the legs of a driver and meets the requirement of the pedal collapsing.

The brake pedal can also be integrated with a brake adjusting unit and an angle sensor connected with the brake adjusting unit, so that pedal arm displacement signals converted by the pedal displacement sensor are transmitted in real time through the angle sensor and are transmitted to the brake adjusting unit, and the braking force can be adjusted to meet the uniqueness of the brake foot feeling. The pedal force transmission principle of the brake pedal with mechanical brake feeling simulation is described next, when a driver steps on the pedal surface 11, the pedal surface 11 and the pedal arm 1 rotate together around a pedal arm rotating shaft 14 and are connected to a pedal connecting arm 17 through a first pin shaft 12, a connecting fork arm 2 and an anti-falling clamp spring 3, the pedal connecting arm 17 drives a pedal connecting shaft 6 and a vacuum booster end connecting arm 15 to rotate, and finally the pedal force of the driver is transmitted to a vacuum booster ejector rod.

Next, describing the principle of adjusting the braking feel of the brake pedal with mechanical braking feel simulation, when the driver steps on the pedal surface 11, the pedal surface 11 rotates together with the pedal arm 1 around the pedal arm rotation axis 14 and pushes the first adjusting spring 9 and the second adjusting spring 10 to compress through the second pin 13, a feedback force is generated to form the braking feel, and the stiffness, the damping and the stroke of the first adjusting spring 9 and the second adjusting spring 10 are adjusted to finally form the proper pedal feel.

The principle of transmitting pedal stroke signals of a brake pedal with mechanical brake feeling simulation is described next, a driver steps on a pedal surface 11, the pedal surface 11 and a pedal arm 1 rotate together around a pedal arm rotating shaft 14, meanwhile, a pedal displacement sensor 5 is driven to rotate through the pedal arm rotating shaft 14, displacement signals of the pedal arm 1 are converted through the pedal displacement sensor 5, and the pedal displacement signals are output to a core electronic control unit of a whole vehicle control decision.

Thus, it should be understood by those skilled in the art that while exemplary embodiments of the present invention have been illustrated and described in detail herein, many other variations or modifications which are consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.

Claims

1. A brake pedal, comprising:

the pedal displacement sensor comprises a pedal arm (1), wherein the pedal arm (1) is connected with a pedal connecting shaft (6) through a connecting fork arm (2) and a pedal connecting arm (17), the pedal connecting shaft (6) is connected with a vacuum booster, and a pedal displacement sensor (5) is installed at the pedal arm (1);

the spring assembly comprises a return spring (7) and an adjusting spring (9), the return spring (7) is installed at a pedal arm rotating shaft (14), the adjusting spring (9) is composed of a plurality of sections of springs, the adjusting spring (9) is fixedly installed at a fixing mechanism connected with a second pin shaft (13), and the second pin shaft (13) is fixed at the pedal arm (1);

the adjusting spring (9) is 3 sections of springs and comprises a first spring (9-2), a second spring (9-3), a third spring (9-4), a first piston (9-6), a second piston (9-7), a first spring supporting block (9-5) and a second spring supporting block (9-8), the first spring (9-2) is arranged between the first piston (9-6) and the first spring supporting block (9-5), a section of idle stroke (9-1) is arranged between the first piston (9-6) and the first spring supporting block (9-5), the second spring (9-3) is arranged on the outer wall of the second piston (9-7), and a cavity is arranged in the center of the second piston (9-7), the first piston (9-6) is movably arranged in the cavity, the second spring supporting block (9-8) is movably arranged on the outer wall of the second piston (9-7), one end of the second spring supporting block (9-8) wraps the second spring (9-3), and the other end of the second spring supporting block (9-8) and the first spring supporting block (9-5) support the third spring (9-4).

2. Brake pedal according to claim 1, characterized in that the adjusting spring (9) is compressed or rebounded in the state of movement of the pedal arm (1) to form a pedal feedback force of the pedal arm (1) in different stroke phases.

3. The brake pedal according to claim 2, wherein the pedal displacement sensor (5) is driven to rotate by the pedal arm rotating shaft (14) during the movement of the pedal arm (1), and further the displacement signal of the pedal arm (1) is converted by the pedal displacement sensor (5) and output to the core electronic control unit of the vehicle control decision to regulate the braking force.

4. The brake pedal of claim 1, wherein the lost motion (9-1) is configured to provide braking force to the brake pedal using motor feedback force when motor feedback force is present and supplement braking force to the brake pedal using ESC boost function when motor feedback force is absent.

5. Brake pedal according to claim 1, characterized in that the stiffness, damping and stroke of the adjusting spring (9) are adjustable.

6. Brake pedal according to claim 1, characterized in that said adjustment spring (9) comprises said first spring (9-2), said second spring (9-3) and said third spring (9-4) having mutually different stiffnesses.

7. Brake pedal according to claim 6, characterized in that the stiffness of said first spring (9-2) is smaller than the stiffness of said second spring (9-3) and the stiffness of said second spring (9-3) is smaller than the stiffness of said third spring (9-4).

8. Brake pedal according to claim 1, characterized in that the number of said adjusting springs (9) is 2.

9. The brake pedal according to claim 1, characterized in that the pedal connecting shaft (6) is tubular, the inner wall of the tubular shape is provided with a gradual change section (6-1), and both ends of the pedal connecting shaft (6) are provided with rotating support blocks (6-2).