Electronic brake pedal

Abstract

The utility model provides an electronic brake pedal, and belongs to the technical field of vehicle brake systems. The electronic brake pedal solves the problem that an existing electronic brake pedal is insufficient in brake safety. The electronic brake pedal comprises a shell, a plate body is hinged to the top end of the shell, a push rod capable of sliding up and down is arranged in the shell in a penetrating mode, a first spring enabling the top end of the push rod to abut against the plate body is connected between the push rod and the shell, and the push rod is sleeved with an adjusting sleeve capable of sliding up and down. A second spring located above the adjusting sleeve is connected between the push rod and the adjusting sleeve, a third spring located below the adjusting sleeve is connected between the adjusting sleeve and the shell, and the rigidity of the second spring is different from that of the third spring. According to the electronic brake pedal, the foot feeling of the pedal is obviously changed after slow braking and traveling braking are switched, and the judgment of a driver on the braking condition is improved, so that the braking safety is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to vehicle braking system technical field relates to an electronic brake pedal. BACKGROUND

[0002] Braking system refers to the system that the motion speed of the motion appliance is forced to reduce. The braking system of the vehicle includes the pedal, the booster, the brake pump and the brake and so on, wherein the pedal is divided into the mechanical brake pedal and the electronic brake pedal again. With the development of new energy vehicles, the electronic brake pedal is widely applied in the field of new energy vehicles.

[0003] For example, a kind of commercial vehicle brake foot valve and commercial vehicle braking system [announcement number: CN218085484U] are disclosed in Chinese patent literature, brake foot valve includes brake pedal, brake pedal is connected with the push rod of vertical arrangement below, push rod is equipped with spring, when brake pedal is pressed down, brake pedal drives push rod to move down and spring compression, to generate pedal damping force.

[0004] In the above-mentioned brake foot valve, the pedal damping force and the pedal rotation angle (or the push rod downstroke) are in the same proportional coefficient from the beginning of braking to the end. When the slow speed braking controlled by small angle pedal is switched to the driving braking controlled by large angle pedal, the pedal damping force does not change significantly, so that the brake foot feeling is not obvious, which can easily cause the misjudgment of the driver to the braking condition and reduce the braking safety. UTILITY MODEL CONTENTS

[0005] The utility model aims at the above-mentioned problems existing in prior art, and provides an electronic brake pedal, which solves the technical problem of how to improve braking safety.

[0006] The utility model can be realized by the following technical schemes:

[0007] An electronic brake pedal, comprising a shell, a plate body is hinged to the top end of the shell, a push rod capable of sliding up and down is arranged in the shell, a first spring connecting the top end of the push rod with the plate body is arranged between the push rod and the shell, characterized in that an adjusting sleeve capable of sliding up and down is sleeved on the push rod, a second spring located above the adjusting sleeve is arranged between the push rod and the adjusting sleeve, a third spring located below the adjusting sleeve is arranged between the adjusting sleeve and the shell, and the stiffness of the second spring is different from that of the third spring.

[0008] When the pedal body is pressed downward, the push rod moves downward, the first spring is compressed, and the second spring and the third spring have different stiffness. For example, the stiffness of the third spring is smaller than that of the second spring. In this case, the second spring does not deform, the adjusting sleeve moves downward, and the third spring with small stiffness is compressed. At this time, the pedal damping force is the sum of the elastic force of the first spring and the elastic force of the third spring. When the push rod moves downward to the compression limit of the third spring or the adjusting sleeve abuts against the shell, the second spring starts to compress. At this time, the pedal damping force is the sum of the elastic force of the first spring, the elastic force of the second spring, and the elastic force of the third spring. The push rod downward stroke when the pedal damping force is the sum of the elastic force of the first spring and the elastic force of the third spring can be used to control the slow-speed braking, and the push rod downward stroke when the pedal damping force is the sum of the elastic force of the first spring, the elastic force of the second spring, and the elastic force of the third spring can be used to control the service braking. Thus, after the slow-speed braking is switched to the service braking, due to the increase of the elastic force of the second spring, the pedal damping force increases obviously with the downward pressing of the pedal. After the service braking is switched to the slow-speed braking, due to the disappearance of the elastic force of the second spring, the pedal damping force also obviously decreases with the upward lifting of the pedal. Thus, the pedal feeling obviously changes after the slow-speed braking and the service braking are switched, the judgment of the driver on the braking condition is improved, and the safety of the braking is improved.

[0009] In the electronic brake pedal described above, the shell has an abutting wall below the third spring, the stiffness of the third spring is smaller than that of the second spring, the lower surface of the adjusting sleeve has a protruding limiting ring, the third spring is sleeved outside the limiting ring, the bottom end of the third spring abuts against the abutting wall, and the lower end surface of the limiting ring and the abutting wall have a spacing distance.

[0010] The spacing distance between the lower end surface of the limiting ring and the abutting wall is the push rod stroke of the slow-speed braking, also known as the idle stroke. When the push rod moves downward to complete the idle stroke, the limiting ring abuts against the abutting wall, and then the push rod continues to move downward, the second spring is compressed. On the one hand, the limiting ring can be used to limit the compression amount of the third spring, prevent the third spring from being damaged due to compression beyond the compression limit, and ensure the normal use of the electronic brake pedal. On the other hand, the spacing distance between the lower end surface of the limiting ring and the abutting wall can be adjusted by adjusting the downward protruding height of the limiting ring, so as to adjust the push rod stroke range of the slow-speed braking, and the adjustment is convenient.

[0011] In the electronic brake pedal described above, the second spring and the third spring are sleeved outside the push rod, and the first spring is sleeved outside the second spring and the third spring. Thus, the length of the push rod can be shortened, the volume of the electronic brake pedal is reduced, and the installation of the electronic brake pedal is facilitated.

[0012] In the electronic brake pedal, a partition cylinder is arranged between the first spring and the second spring, the third spring and the adjusting sleeve are located inside the partition cylinder. The partition cylinder separates the first spring from the second spring and the third spring, avoids interference between the first spring and the second spring and the third spring, avoids pedal damping force change confusion caused by interference, improves the driver's judgment of the braking condition, and improves the safety of the brake.

[0013] In the electronic brake pedal, the outer side of the lower end of the partition cylinder has a convex ring protruding outward, and the convex ring is located between the abutting wall and the first spring. The first spring abuts on the convex ring to axially position the partition cylinder, prevent the partition cylinder from moving axially to affect the separation between the first spring and the third spring, and ensure the normal use of the electronic brake pedal.

[0014] In the electronic brake pedal, the outer side of the lower end of the partition cylinder has a convex ring protruding outward, and the convex ring is located between the abutting wall and the first spring. The first spring abuts on the convex ring to axially position the partition cylinder, prevent the partition cylinder from moving axially to affect the separation between the first spring and the third spring, and ensure the normal use of the electronic brake pedal.

[0015] In the electronic brake pedal, the outer side of the lower end of the partition cylinder has a convex ring protruding outward, and the convex ring is located between the abutting wall and the first spring. The first spring abuts on the convex ring to axially position the partition cylinder, prevent the partition cylinder from moving axially to affect the separation between the first spring and the third spring, and ensure the normal use of the electronic brake pedal.

[0016] In the electronic brake pedal, the elastic coefficient of the second spring is greater than the sum of the elastic coefficients of the first spring and the third spring.

[0017] In this way, the increase and disappearance of the second spring force can be more obvious, thereby improving the driver's judgment of the braking condition, and improving the safety of the brake.

[0018] In the electronic brake pedal, two potentiometers are fixed on the housing, and an abutting piece abutting against the contacts of the two potentiometers is fixed on the push rod. When the push rod moves, the abutting piece pushes the contacts of the two potentiometers to move, thereby generating a displacement signal, and the potentiometers are used to detect the stroke of the push rod. The two potentiometers are redundantly arranged to ensure the reliability of the electronic brake pedal.

[0019] In the electronic brake pedal, the fixed sleeve is fixed on the push rod above the second spring, the rigidity of the second spring is smaller than that of the third spring, the upper surface of the adjusting sleeve is provided with a protruding limiting ring, the second spring is sleeved outside the limiting ring, and the top end of the second spring abuts against the fixed sleeve and the upper end surface of the limiting ring is spaced apart from the fixed sleeve.

[0020] When the plate body is pressed downward, the push rod moves downward, the first spring is compressed, the third spring does not deform because the rigidity of the second spring is smaller than that of the third spring, the fixed sleeve moves downward with the push rod to compress the second spring, at this time, the pedal damping force is the sum of the elastic forces of the first spring and the second spring; when the push rod moves downward to abut against the limiting ring, the third spring starts to compress, at this time, the pedal damping force is the sum of the elastic forces of the first spring, the second spring and the third spring. The push rod downward stroke when the pedal damping force is the sum of the elastic forces of the first spring and the second spring can be used for controlling the slow speed braking, and the push rod downward stroke when the pedal damping force is the sum of the elastic forces of the first spring, the second spring and the third spring can be used for controlling the driving braking. Thus, after the slow speed braking is switched to the driving braking, the pedal damping force increases obviously with the downward pressing of the pedal due to the increase of the elastic force of the third spring, and after the driving braking is switched to the slow speed braking, the pedal damping force also obviously decreases with the upward lifting of the pedal due to the disappearance of the elastic force of the third spring, so that the pedal feeling obviously changes after the slow speed braking and the driving braking are switched, the judgment of the driver on the braking condition is improved, and the safety of the braking is improved. The limiting ring is arranged on one side to limit the compression amount of the second spring and prevent the second spring from being damaged due to compression beyond the compression limit, and on the other side to adjust the interval distance between the upper end surface of the limiting ring and the fixed ring by adjusting the upward protruding height of the limiting ring, so that the push rod stroke range of the slow speed braking is adjusted, and the adjustment is convenient.

[0021] Compared with the prior art, the electronic brake pedal has the following advantages:

[0022] The pedal feeling obviously changes after the slow speed braking and the driving braking are switched, the judgment of the driver on the braking condition is improved, and the safety of the braking is improved. The output signal of the electronic brake pedal is stable and has good consistency, the safety of the braking is improved. Moreover, the electronic brake pedal has compact structure, small size and saves installation space. In addition, the electronic brake pedal has a double-channel signal redundancy function to ensure braking safety. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic diagram of the electronic brake pedal embodiment one.

[0024] Figure 2 is Figure 1 is an enlarged view of A in figure.

[0025] Figure 3 is a pin circuit diagram of the electronic brake pedal embodiment one.

[0026] Figure 4 is a characteristic curve of the electronic brake pedal embodiment one.

[0027] In the figure, 1, shell; 1a, abutting wall; 1b, positioning ring; 2, plate body; 3, push rod; 3a, blocking ring; 4, first spring; 5, adjusting sleeve; 5a, limiting ring; 6, second spring; 7, third spring; 8, positioning sleeve; 9, separation cylinder; 9a, convex ring; 10, abutting piece; 11, potentiometer; 12, circuit board; 13, socket; S, push rod stroke; α, plate body rotation angle; Us, potentiometer output voltage signal; F, pedal damping force. DETAILED DESCRIPTION

[0028] The following is a specific embodiment of the utility model and further describes the technical scheme of the utility model in combination with the drawings, but the utility model is not limited to these embodiments.

[0029] Embodiment one

[0030] As Figure 1 shown, an electronic brake pedal comprises a shell 1 and a plate body 2, a push rod 3 capable of sliding up and down is arranged in the shell 1, and a first spring 4 for abutting the top end of the push rod 3 against the plate body 2 is connected to the push rod 3. A roller [not shown in the figure] is connected to the lower surface of the plate body 2, and the top end of the push rod 3 abuts against the roller. The shell 1 comprises an upper shell and a lower shell, the upper shell and the lower shell are fixedly connected by bolts, the top of the lower shell is provided with an abutting wall 1a, and the push rod 3 is arranged through the top wall of the upper shell and the abutting wall 1a. The lower end of the push rod 3 passes through the abutting wall 1a and is fixed with an abutting piece 10, a window is arranged on the side wall of the lower shell, and a detachable cover plate is arranged on the window. A support is fixed in the lower shell, two potentiometers 11 are fixed on the support, the two potentiometers 11 are arranged side by side in the horizontal direction, and the contacts of the two potentiometers 11 are arranged downward, the abutting piece 10 is disc-shaped, and the abutting piece 10 abuts against the contacts of the two potentiometers 11. When the push rod 3 slides up and down, the contacts of the two potentiometers 11 can be driven to move, thereby generating different voltage signals. The shell 1 is also fixed with a circuit board 12, the circuit board 12 is electrically connected with the two potentiometers 11, and the corresponding relationship between the pins on the circuit board 12 and the socket 13 is as shown in Figure 3As shown, pins 1 and 4 are positive, pins 2 and 5 are negative, and pins 3 and 6 are signal outputs.

[0031] like Figure 1 and Figure 2 As shown, a sliding adjustment sleeve 5 is fitted onto the push rod 3, positioned above the abutment wall 1a. A protruding retaining ring 3a is located on the outer surface of the push rod 3 above the adjustment sleeve 5. A second spring 6 connects the retaining ring 3a to the adjustment sleeve 5, and a third spring 7 connects the adjustment sleeve 5 to the abutment wall 1a. The stiffness of the second spring 6 is greater than that of the third spring 7. The first spring 4 and the second spring 6 are compression springs, and the third spring 7 is a wave spring. The elastic coefficient of the second spring 6 is greater than the sum of the elastic coefficients of the first spring 4 and the second spring 6. For example, the elastic coefficient of the second spring 6 is 50.20 N / mm, and the elastic coefficients of the first spring 4 and the third spring 7 are 13.33 N / mm. The second spring 6 and the third spring 7 are fitted onto the outer side of the push rod 3, and the first spring 4 is fitted onto the outer side of the second spring 6 and the third spring 7. A positioning sleeve 8 is fitted onto the push rod 3 between the retaining ring 3a and the second spring 6, with both ends of the second spring 6 abutting against the positioning sleeve 8 and the adjustment sleeve 5, respectively. The lower surface of the adjusting sleeve 5 has a protruding limiting ring 5a. A third spring 7 is fitted onto the outside of the limiting ring 5a, with both ends of the third spring 7 abutting against the adjusting sleeve 5 and the abutting wall 1a respectively. There is a gap between the lower end face of the limiting ring 5a and the abutting wall 1a. A cylindrical separator 9 is provided between the first spring 4 and the second spring 6. The third spring 7 and the adjusting sleeve 5 are both located inside the separator 9, and the first spring 4 is located outside the positioning sleeve 8. The positioning sleeve 8 and the separator 9 are axially separated. The outer surface of the lower end of the separator 9 has an outwardly protruding ring 9a. Both ends of the first spring 4 abut against the retaining ring 3a and the protruding ring 9a respectively. On the upper surface of the abutting wall 1a, outside the first spring 4, is a protruding annular positioning ring 1b. The outer side of the protruding ring 9a abuts against the inner side of the positioning ring 1b. Figure 1 As shown, at this time, the push rod stroke S and the plate rotation angle α are both zero, which is the initial braking state. The first spring 4, the second spring 6 and the third spring 7 are all in the natural state of zero elastic force.

[0032] like Figure 3 and Figure 4 As shown, the two potentiometers 11 form a dual-output signal, namely, a dual-channel voltage signal Us. The characteristic curves of the two voltage signals Us are identical. The two potentiometers 11 are used to detect the push rod stroke S. The two potentiometers 11 form a redundant design; when one potentiometer 11 fails, the other potentiometer 11 can still be used. Figure 4As shown, the characteristic curve of the potentiometer 11 is a linear curve in positive proportion to the push rod stroke S. Before braking, the push rod 3 abuts against the plate body 2, the plate body 2 keeps in the state of upward tilting, at this time the output signal of the potentiometer 11 is 0.5V voltage, the push rod stroke S and the plate body rotation angle α are both zero. When braking, the downward pedal force is applied to the plate body 2, the plate body 2 rotates downward, thereby driving the push rod 3 to move downward, the first spring 4 and the third spring 7 are compressed, the sum of the elastic force of the first spring 4 and the elastic force of the third spring 7 forms the first stage pedal damping force F. When the plate body rotation angle α is 9°, the push rod stroke S is 4.5mm, the limiting ring 5a of the adjusting sleeve 5 abuts against the abutting wall 1a. The plate body 2 continues to rotate downward, the second spring 6 is compressed, the sum of the elastic force of the first spring 4, the elastic force of the second spring 6 and the elastic force of the third spring 7 forms the second stage pedal damping force F. The stroke of the push rod stroke S of 0-4.5mm is called the idle stroke, the voltage signal output is used to control the retarder or the driving motor to brake; the stroke of the push rod stroke S of 4.5-13mm is the linear stroke, the voltage signal output is used to control the EMB motor, the retarder and the driving motor to brake.

[0033] Embodiment two

[0034] The stiffness of the third spring 7 is greater than the stiffness of the second spring 6, the second spring 6 is a wave-shaped spring sheet, and the third spring 7 is a compression spring. The fixed sleeve is fixed on the push rod 3 above the second spring 6, the upper surface of the adjusting sleeve 5 has the protruding limiting ring 5a, the second spring 6 is sleeved outside the limiting ring 5a, the two ends of the second spring 6 abut against the fixed sleeve and the adjusting sleeve 5 respectively, and the two ends of the third spring 7 abut against the adjusting sleeve 5 and the abutting wall 1a respectively. The upper end surface of the limiting ring 5a and the fixed sleeve have a spacing distance. Other structures are basically the same as those of embodiment one.

[0035] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or use similar ways to replace, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. An electronic brake pedal, comprising a housing (1), a plate body (2) hinged to the top end of the housing (1), a push rod (3) slidably arranged in the housing (1), and a first spring (4) connecting the top end of the push rod (3) to the plate body (2) to abut against each other, characterized in that, The push rod (3) is sleeved with an adjusting sleeve (5) which can slide up and down, a second spring (6) is connected between the push rod (3) and the adjusting sleeve (5) and located above the adjusting sleeve (5), a third spring (7) is connected between the adjusting sleeve (5) and the shell (1) and located below the adjusting sleeve (5), and the rigidity of the second spring (6) is different from that of the third spring (7).

2. The electronic brake pedal according to claim 1, characterized in that The shell (1) is provided with an abutting wall (1a) below the third spring (7), the rigidity of the third spring (7) is smaller than that of the second spring (6), the lower surface of the adjusting sleeve (5) is provided with a protruding limiting ring (5a), the third spring (7) is sleeved outside the limiting ring (5a), the bottom end of the third spring (7) abuts against the abutting wall (1a), and the lower end surface of the limiting ring (5a) is spaced apart from the abutting wall (1a).

3. The electronic brake pedal according to claim 2, characterized in that The second spring (6) and the third spring (7) are sleeved outside the push rod (3), and the first spring (4) is sleeved outside the second spring (6) and the third spring (7).

4. The electronic brake pedal according to claim 3, characterized in that A separation cylinder (9) in a cylindrical shape is arranged between the first spring (4) and the second spring (6), and the third spring (7) and the adjusting sleeve (5) are located inside the separation cylinder (9).

5. The electronic brake pedal according to claim 4, characterized in that The outer side surface of the lower end of the separation cylinder (9) is provided with a convex ring (9a) protruding outward, and the convex ring (9a) is located between the abutting wall (1a) and the first spring (4).

6. The electronic brake pedal according to claim 5, characterized in that The upper surface of the abutting wall (1a) is provided with a protruding positioning ring (1b) in an annular shape outside the first spring (4), and the outer side surface of the convex ring (9a) abuts against the inner side surface of the positioning ring (1b).

7. The electronic brake pedal according to any of claims 3-6, characterized in that The outer side surface of the push rod (3) is provided with a protruding blocking ring (3a) above the first spring (4), the top end of the first spring (4) abuts against the blocking ring (3a), a positioning sleeve (8) is sleeved between the blocking ring (3a) and the second spring (6) on the push rod (3), and the first spring (4) is located outside the positioning sleeve (8).

8. The electronic brake pedal according to any of claims 1 to 6, characterized in that The elastic coefficient of the second spring (6) is greater than the sum of the elastic coefficients of the first spring (4) and the third spring (7).

9. The electronic brake pedal according to any of claims 1-6, characterized in that Two potentiometers (11) are fixed on the shell (1), and an abutting piece (10) abuts against the contacts of the two potentiometers (11) is fixed on the push rod (3).

10. The electronic brake pedal of claim 1, wherein, A fixed sleeve is fixed on the push rod (3) above the second spring (6), the rigidity of the second spring (6) is smaller than that of the third spring (7), the upper surface of the adjusting sleeve (5) is provided with a protruding limiting ring (5a), the second spring (6) is sleeved outside the limiting ring (5a), the top end of the second spring (6) abuts against the fixed sleeve, and the upper end surface of the limiting ring (5a) is spaced apart from the fixed sleeve.

Images