A brake pedal structure with self-adjustable lever ratio

Abstract

The present invention relates to a brake pedal structure with self-adjustable lever ratio, and belongs to the technical field of automobile design and manufacturing. The brake pedal structure with self-adjustable lever ratio of the present invention comprises a pedal bracket and a pedal arm assembly; a limit hole is provided on the pedal bracket, a limit pin passes through the limit hole and is fixed on the pedal bracket, and the pedal arm assembly comprises a first pedal arm and a second pedal arm, and the first pedal arm is mounted on the pedal bracket through a first rotating shaft; a coil spring is provided between the two side walls of the upper end of the second pedal arm, the first pedal arm and the second pedal arm are connected through a second rotating shaft, and the lower end of the first pedal arm is located on the outside of the coil spring; a booster master cylinder push rod connection point is provided on the second pedal arm. The brake pedal structure of the present invention has a smaller lever ratio at the initial stage of braking, automatically increases the lever ratio during emergency braking, and can automatically restore to the initial state without manual adjustment or replacement of parts.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile design and manufacture, and more particularly to a brake pedal structure capable of self-adjusting a lever ratio. Background Art

[0002] In the prior art, Figure 1 The brake pedal shown has a fixed pedal lever ratio. Figure 1 The lever ratio shown in is i = A / B. However, in actual working conditions, at the beginning of braking, a faster pedal response is required, and the pedal stroke needs to be reduced, that is, a smaller lever ratio is used; but when continuing to step on the pedal or emergency braking, a larger pedal force is required, which will generate a larger pedal force and cause the pedal feel to decrease.

[0003] For this purpose, a brake pedal with adjustable lever ratio has been developed in the prior art. CN202944326U discloses a brake pedal with a pedal upper arm and a pedal lower arm, which adjusts the pedal lever ratio by itself by setting an adjustment device on the pedal upper arm and the pedal lower arm. CN201816544U discloses a collapsible automobile pedal mechanism, wherein a collapsible rotating member is provided on a bracket, and after the limit pin is broken, the corresponding transmission curved surface on the pedal arm and the collapsible rotating member can be separated to improve safety protection. CN110588602A discloses a brake pedal with a variable lever ratio, wherein an adjusting screw is provided at the hinge between the brake pedal arm and the booster push rod, a screw sleeve is sleeved on the adjusting screw, and two locking nuts are screwed, and one end of the booster push rod is hinged to the screw sleeve. The brake pedal needs to adjust the lever ratio by loosening the locking nut. However, the above structures cannot meet the requirements of having a smaller lever ratio at the initial stage of braking and automatically increasing the lever ratio when emergency braking or a larger braking deceleration is required.

[0004] In order to meet the demand for a large lever ratio during emergency braking, some technologies have developed a brake pedal structure with a variable lever ratio. However, a one-time trigger mechanism is required to implement it. After emergency braking, the trigger mechanism will be damaged and needs to be replaced, which limits its application. Summary of the invention

[0005] In order to solve the above technical problems existing in the prior art, an object of the present invention is to provide a brake pedal structure with self-adjustable lever ratio.

[0006] The brake pedal structure with self-adjustable lever ratio of the present invention is characterized in that the pedal bracket is provided with an axial hole and a limit channel, and the limit channel is arranged on the periphery of the axial hole; the limit pin passes through the limit channel and is fixed on the pedal bracket, and to meet the pedal feel requirements of different vehicle models, the limit pin can select a fixed position within the channel range; the pedal arm assembly includes a first pedal arm and a second pedal arm, and the first pedal arm is rotatably mounted on the pedal bracket through a first rotating shaft passing through the axial hole; a coil spring is arranged between the two side walls of the upper end of the second pedal arm, and the lower end of the first pedal arm is connected and fixed to the upper end of the second pedal arm by a second rotating shaft, the lower end of the first pedal arm is located between the two side walls of the upper end of the second pedal arm, and the lower end of the first pedal arm is located on the outside of the coil spring; a power-assisting master cylinder push rod connection point is arranged on the second pedal arm.

[0007] Wherein, the limiting hole is in an arc shape, and the distances from each point on the center line of the limiting hole to the center of the axial hole are equal.

[0008] Wherein, the limiting pin is fixed in the limiting hole by means of bolts.

[0009] Wherein, the first pedal arm is a plate-shaped structure.

[0010] Wherein, a foot pedal is arranged at the lower end of the second pedal arm.

[0011] Among them, the distance from the first rotating axis to the driver's force application point is C, and the distance from the first rotating axis to the connection point of the power-assisting master cylinder push rod is D; when the rotation of the first pedal arm is not restricted, the lever ratio of the brake pedal structure is i1=C / D.

[0012] Wherein, the distance from the first rotation axis to the second rotation axis is E, and when the first pedal arm rotates to contact with the limit pin, the brake pedal lever ratio of the brake pedal structure is (CE) / (DE).

[0013] Among them, C / E is greater than 3 and C / D is greater than 1.

[0014] Compared with the prior art, the brake pedal structure with self-adjustable lever ratio of the present invention has the following beneficial effects:

[0015] The brake pedal structure of the present invention has a smaller lever ratio at the initial stage of braking, automatically increases the lever ratio when emergency braking or when a larger braking deceleration is required, and can automatically restore to the initial state without manual adjustment or replacement of parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a brake pedal in the prior art.

[0017] Figure 2 It is a structural schematic diagram of the brake pedal structure with self-adjustable lever ratio of the present invention.

[0018] Figure 3 The figure is a schematic diagram of the motion trajectory of the brake pedal structure with self-adjustable lever ratio of the present invention.

[0019] Figure 4 This is a first application state diagram of the brake pedal structure with self-adjustable lever ratio of the present invention.

[0020] Figure 5 This is a second application state diagram of the brake pedal structure with self-adjustable lever ratio of the present invention. DETAILED DESCRIPTION

[0021] The brake pedal structure with self-adjustable lever ratio of the present invention will be further described below in conjunction with specific embodiments to help those skilled in the art to have a more complete, accurate and in-depth understanding of the technical solution of the present invention.

[0022] Example 1

[0023] like Figure 2-3 As shown, this embodiment provides a brake pedal structure with self-adjustable lever ratio, which includes a pedal bracket 20 and a pedal arm assembly. The pedal bracket 20 is provided with an axial hole 21 and a limiting hole 22. The limiting hole 22 is arranged at the periphery of the axial hole 21, and the limiting hole 22 is arc-shaped, and the distances from each point of the center line of the limiting hole 22 to the center of the axial hole 21 are equal. The pedal arm assembly includes a first pedal arm 14 and a second pedal arm 15. The first pedal arm 14 is rotatably mounted on the pedal bracket 20 through a first rotating shaft 17 passing through the axial hole 21. The limiting pin 11 passes through the limiting hole 22 and is fixed to the pedal bracket 20 through a threaded structure. To meet the pedal feel requirements of different vehicle models, the limiting pin can select a fixed position within the hole 22. When the first pedal arm 14 rotates along the first rotating shaft 17 to contact the limiting pin 11, the first pedal arm 14 is limited from continuing to rotate, so that even if the pedal force is continued to be applied, the first pedal arm 14 cannot rotate. The first pedal arm 14 is preferably a plate-like structure. A coil spring 12 is provided between the two side walls of the upper end of the second pedal arm 15, and the lower end of the first pedal arm 14 is connected and fixed to the upper end of the second pedal arm 15 via a second rotating shaft 13. The lower end of the first pedal arm 14 is located between the two side walls of the upper end of the second pedal arm 15, and the lower end of the first pedal arm 14 is located on the outside of the coil spring 12. A power-assisting master cylinder push rod connection point 16 is provided on the second pedal arm 15. A footrest 18 is provided at the lower end of the second pedal arm 15. Figure 4As shown, the distance between the first rotating shaft 17 and the force point of the pedal 18 is C, and the distance between the first rotating shaft 17 and the connection point 16 of the power-assisting master cylinder push rod is D. When the pedal 18 is initially stepped on or braked at a small deceleration, the rotation of the first pedal arm 14 is not restricted. At this time, the first pedal arm 14 and the second pedal arm 15 can be regarded as an integral structure under the action of the coil spring 12, and the lever ratio at this time is i1=C / D. Figure 5 As shown, when emergency braking is input with a large pedal force ( Figure 3 As shown by the dotted line in Figure 5 As shown, when the first pedal arm 14 rotates to contact the stop pin 11, the first pedal arm 14 stops rotating, and the second pedal arm 15 continues to rotate around the second rotation axis 13, and the distance from the first rotation axis to the second rotation axis is marked as E. The brake pedal lever ratio at this time is (CE) / (DE), thereby achieving an increase in the lever ratio. In this embodiment, C / E is preferably greater than 3, more preferably greater than 5, and C / D is required to be greater than 1. The brake pedal structure of this embodiment can be applied to various types of vehicles that use a pedal as a brake operating mechanism, and after emergency braking or large pedal force input, the brake pedal structure with self-adjustable lever ratio will automatically return to the initial state ( Figure 3 The solid line portion in the figure can be removed without replacing any parts.

[0024] For ordinary technicians in this field, the specific embodiments are only illustrative descriptions of the present invention. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the technical solution of the present invention, they are all within the protection scope of the present invention.

Claims

1. A brake pedal structure with self-adjustable lever ratio, comprising a pedal bracket and a pedal arm assembly; characterized in that: The pedal bracket is provided with an axial hole and a limiting hole, and the limiting hole is arranged at the periphery of the axial hole; the limiting pin passes through the limiting hole and is fixed on the pedal bracket. In order to meet the pedal feeling requirements of different vehicle models, the limiting pin can select a fixed position within the hole range; the pedal arm assembly includes a first pedal arm and a second pedal arm, and the first pedal arm is rotatably mounted on the pedal bracket through a first rotating shaft passing through the axial hole; a coil spring is arranged between the two side walls of the upper end of the second pedal arm, and the lower end of the first pedal arm is connected and fixed to the upper end of the second pedal arm through a second rotating shaft, the lower end of the first pedal arm is located between the two side walls of the upper end of the second pedal arm, and the lower end of the first pedal arm is located on the outside of the coil spring; a power-assisting master cylinder push rod connection point is arranged on the second pedal arm; the limiting pin is fixed in the limiting hole by bolts; the limiting hole is in an arc shape, and the distances from each point on the center line of the limiting hole to the center of the axial hole are equal; the first pedal arm is a plate-like structure.

2. The brake pedal structure with self-adjustable lever ratio according to claim 1, characterized in that: A footrest is provided at the lower end of the second pedal arm.

3. The brake pedal structure with self-adjustable lever ratio according to claim 2, characterized in that: The distance from the first rotating axis to the driver's force application point is C, and the distance from the first rotating axis to the connection point of the power-assisting master cylinder push rod is D; when the rotation of the first pedal arm is not restricted, the lever ratio of the brake pedal structure is i1=C / D.

4. The brake pedal structure with self-adjustable lever ratio according to claim 3, characterized in that: The distance from the first rotation axis to the second rotation axis is E. When the first pedal arm rotates to contact the limit pin, the brake pedal lever ratio of the brake pedal structure is (CE) / (DE).

5. The brake pedal structure with self-adjustable lever ratio according to claim 4, characterized in that: C / E is greater than 3, C / D is greater than 1.

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