An integrated brake pedal feel simulator

Abstract

The utility model relates to the brake pedal foot feeling simulator field, concretely relates to an integrated brake pedal foot feeling simulator, include: casing, the axial extension piston cavity is equipped in casing, piston main part, piston main part is axially slidingly arranged in the piston cavity, transmission rod, transmission rod is fixed on piston main part, the axial one end of casing is equipped with the perforation corresponding the piston cavity with transmission rod, transmission rod passes through the perforation and extends out of the piston cavity, transmission rod is connected with outside brake pedal drive, elastic module and piston main part far from transmission rod one end abuts, the braking fluid of preset volume, the braking fluid is sealed in the piston cavity, the throttle flow channel of axial intercommunication piston main part both ends. Can slow down the speed of piston main part and brake pedal reset, prevent the rebound and hit the foot.

Description

Technical Field

[0001] This utility model relates to the field of brake pedal feel simulators, specifically to an integrated brake pedal feel simulator. Background Technology

[0002] In the automotive field, electronic braking systems differ from the braking systems of traditional fuel-powered vehicles. In an electronic braking system, the brake pedal can be understood as a brake signal input button. The damping sensation generated by pressing the brake pedal is fed back through a simulator. For example, the pedal travel simulator disclosed in Chinese Utility Model Patent Publication No. CN 113767041 A uses a combination of disc springs to generate elastic force that is fed back to an external hydraulic circuit. The hydraulic circuit provides damping sensation to simulate the damping sensation of pressing the pedal.

[0003] The newly introduced EMB (Electronic Mechanical Brake) system, compared to EHB, eliminates the hydraulic circuit. If a purely elastic element is used to provide the reset force for the pedal simulator, the following drawbacks will exist:

[0004] On the one hand, the reaction force generated by purely elastic elements (such as wire springs) is singular and difficult to simulate the feel of a traditional car brake pedal, which may cause discomfort to drivers who have developed traditional car driving habits.

[0005] On the other hand, when the pedal is released, the elastic element will push the pedal to return to its original position suddenly, which will cause a rebound and kick. Utility Model Content

[0006] To overcome the shortcomings of the prior art, this utility model provides an integrated brake pedal feel simulator that can provide composite damping, making it easy to simulate the feel of a traditional car brake pedal, and can prevent the pedal from suddenly rebounding and hitting the foot.

[0007] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0008] An integrated brake pedal feel simulator, comprising:

[0009] The housing has an axially extending piston chamber inside.

[0010] Piston body, which is axially slidable within piston chamber;

[0011] The transmission rod is fixed to the piston body. The housing has a through hole at one end corresponding to the piston cavity, which is adapted to the transmission rod. The transmission rod extends out of the piston cavity through the through hole and is used to connect with the external brake pedal to receive external force.

[0012] The elastic module is located inside the piston cavity and abuts against the end of the piston body away from the transmission rod.

[0013] When the transmission rod receives external force, that is, during the process of the brake pedal being pressed, the piston body moves towards the side of the elastic module. During this process, the elastic module elastically deforms and stores energy and applies a rebound force to the piston body.

[0014] When the external force on the transmission rod disappears, that is, when the brake pedal is released, the spring module is used to push the piston body to move away from the spring module to reset.

[0015] Also includes:

[0016] A preset volume of brake fluid is sealed within the piston chamber.

[0017] A throttling flow channel axially connecting both ends of the piston body;

[0018] As the piston body reciprocates axially within the piston chamber, some of the brake fluid passes through the throttling channel to transfer between the two axial sides of the piston body.

[0019] Based on the above device, this utility model provides an integrated brake pedal feel simulator, the principle of which is:

[0020] During the process of the brake pedal being pressed, the piston body moves toward the elastic module. During this process, the elastic module elastically deforms and stores energy and applies a rebound force to the piston body to partially correspond to the damping of pressing the brake pedal. During this process, some of the brake fluid is transferred from the side of the piston body near the elastic module to the side of the piston body away from the elastic module through the throttling channel.

[0021] When the brake pedal is released, the spring module pushes the piston body to move away from the spring module and reset. During this process, the brake fluid located on the side of the piston body away from the spring module is transferred to the side of the piston body closer to the spring module through the throttling channel.

[0022] Furthermore, in an integrated brake pedal feel simulator of this application, the throttling channel is disposed on the piston body and / or between the piston body and the inner wall of the piston chamber.

[0023] Furthermore, in this application, an integrated brake pedal feel simulator includes a sealing ring fixed to the housing. The sealing ring is sealed to a perforation and a transmission rod, with the transmission rod slidably passing through the inner hole of the sealing ring. The sealing ring seals the radial gap between the perforation and the transmission rod. As a preferred embodiment of this application, a sliding seal is formed between the sealing ring and the transmission rod to prevent brake fluid leakage.

[0024] Furthermore, in an integrated brake pedal feel simulator of this application, the piston body is provided with a fluid passage axially connecting both ends of the piston body. A one-way valve is provided on the fluid passage to unilaterally block the fluid passage, so that brake fluid can only flow from the side of the piston body near the elastic module to the other side within the fluid passage. As a preferred embodiment of this application, by setting the one-way valve and fluid passage, when the piston body moves towards the elastic module side, the brake fluid on the side of the piston body near the elastic module can be transferred to the other side of the piston body through the one-way valve, reducing the damping effect of the throttling passage and improving the braking response corresponding to the elastic module. During reset, the fluid passage blocks the one-way valve, so that brake fluid can only be transferred from the throttling passage to the side of the piston body near the elastic module, thus ensuring the rebound damping effect.

[0025] Furthermore, in an integrated brake pedal foot feel simulator of this application, during the movement of the piston body, there is always a gap between the top surface of the brake fluid and the inner wall of the piston cavity to ensure that even when the piston body moves to its limit towards the elastic module, there is always space in the piston cavity for the piston body to enter.

[0026] As the piston body enters the piston chamber, it compresses the air in the piston chamber. If the brake fluid can fill the piston chamber as the piston body moves toward the elastic module, the brake fluid will be difficult to compress, thus hindering the movement of the piston body and affecting the compression of the elastic module, causing a deviation in the foot feel simulation.

[0027] Furthermore, the integrated brake pedal foot feel simulator of this application also includes a buffer pad fixed to one or both ends of the piston chamber axially.

[0028] Furthermore, the integrated brake pedal feel simulator of this application also includes a buffer spring element. The buffer spring element abuts against the end of the piston body away from the spring module. As the piston body moves away from the spring module, the buffer spring element stores energy to generate damping on the piston body. This, combined with the flow of brake fluid, creates a composite damping effect.

[0029] Furthermore, in an integrated brake pedal foot feel simulator of this application, the throttling channel includes a through hole extending through the piston body.

[0030] Furthermore, in an integrated brake pedal foot feel simulator of this application, the piston body and the inner wall of the piston cavity are in clearance fit, and the throttling channel includes a radial clearance between the piston body and the inner wall of the piston cavity.

[0031] As can be seen from the above technical solution, this utility model has the following beneficial effects:

[0032] This invention provides an integrated brake pedal feel simulator. Because the opening area of ​​the throttling channel is sufficiently small compared to the flow resistance area of ​​the piston body, resistance is generated during the piston body's return movement due to the difficulty in quickly balancing the fluid pressure on both sides of the piston body, resulting in a hydraulic damping effect. Therefore:

[0033] During the process of the brake pedal being pressed, the hydraulic damping generated, combined with the elasticity of the elastic module, makes the force overcome by pressing the pedal a composite damping formed by the hydraulic damping and the elasticity of the elastic module, so as to simulate the foot feel of a traditional car brake pedal.

[0034] When the brake pedal rebounds and resets, it can slow down the speed at which the piston body and brake pedal reset, preventing the foot from being hit by the rebound. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the principle of an integrated brake pedal foot feel simulator according to one embodiment of this application (the throttling channel passes through the piston body).

[0036] Figure 2 This is a schematic diagram of the principle of an integrated brake pedal foot feel simulator according to one embodiment of this application (the throttling channel is located radially between the piston body and the piston cavity).

[0037] In the diagram: 1-Housing; 10-Piston chamber; 11-Perforation; 12-Sealing ring; 2-Piston body; 20-Throttle channel; 22-One-way valve; 23-Fluid passage; 3-Transmission rod; 4-Elastic module; 5-Brake fluid; 61-Buffer pad; 62-Buffer elastic component. Detailed Implementation

[0038] Combination Figure 1 or Figure 2 An integrated brake pedal feel simulator shown includes:

[0039] Housing 1, with an axially extending piston chamber 10 inside the housing 1;

[0040] Piston body 2, which is axially slidably disposed within piston cavity 10;

[0041] The transmission rod 3 is fixed on the piston body 2. The housing 1 has a through hole 11 at one end corresponding to the piston cavity 10, which is adapted to the transmission rod 3. The transmission rod 3 extends out of the piston cavity 10 through the through hole 11. The transmission rod 3 is used to connect with the external brake pedal (not shown) to receive external force.

[0042] Elastic module 4 is disposed in piston cavity 10 and abuts against the end of piston body 2 away from transmission rod 3;

[0043] When the transmission rod 3 receives external force, that is, during the process of the brake pedal being pressed, the piston body 2 moves toward the elastic module 4. During this process, the elastic module 4 elastically deforms and stores energy and applies a rebound force to the piston body 2.

[0044] When the external force on the transmission rod 3 disappears, that is, when the brake pedal is released, the spring module 4 is used to push the piston body 2 to move away from the spring module 4 to reset.

[0045] Also includes:

[0046] A preset volume of brake fluid 5 is sealed within the piston chamber 10;

[0047] A throttling channel 20 is axially connected to both ends of the piston body 2;

[0048] As the piston body 2 reciprocates axially within the piston chamber 10, a portion of the brake fluid 5 passes through the throttling channel 20 to transfer between the two axial sides of the piston body 2.

[0049] Based on the above device, an integrated brake pedal feel simulator is based on the following principle:

[0050] During the process of the brake pedal being pressed, the piston body moves toward the side of the elastic module 4. During this process, the elastic module 4 elastically deforms and stores energy and applies a rebound force to the piston body to partially correspond to the damping of pressing the brake pedal. During this process, part of the brake fluid 5 is transferred from the side of the piston body near the elastic module 4 through the throttling channel 20 to the side of the piston body away from the elastic module 4.

[0051] When the brake pedal is released, the spring module 4 is used to push the piston body to move away from the spring module 4 to reset. During this process, the brake fluid 5 located on the side of the piston body away from the spring module 4 is transferred to the side of the piston body near the spring module 4 through the throttling channel 20.

[0052] Because the opening area of ​​the throttling channel 20 is sufficiently small compared to the flow obstruction area of ​​the piston body, resistance is generated during the piston body's return movement due to the difficulty in quickly balancing the fluid pressure on both sides of the piston body, resulting in a hydraulic damping effect. Consequently:

[0053] During the process of the brake pedal being pressed, damping is generated. Combined with the elasticity of the elastic module 4, the force that is overcome when the pedal is pressed is a composite damping formed by hydraulic damping and the elasticity of the elastic module 4, so as to simulate the foot feel of a traditional car brake pedal.

[0054] When the brake pedal rebounds and resets, it can slow down the speed at which the piston body and brake pedal reset, preventing the foot from being hit by the rebound.

[0055] In one embodiment, the elastic module 4 includes a set of stacked disc springs; in other embodiments, the elastic module 4 includes one or more of disc springs, wire springs, and rubber.

[0056] Specifically, the throttling channel 20 is disposed on the piston body 2 and / or between the piston body 2 and the inner wall of the piston chamber 10. (Combined) Figure 1 As shown, in one embodiment, the throttling channel 20 includes a through hole passing through the piston body 2. Specifically, the size and number of through holes corresponding to the throttling channel 20 can be flexibly adjusted to adapt to a preset simulated foot feel. Specifically, in one embodiment, the through hole can be directly machined on the piston body 2; in another embodiment, the through hole passes through a screw (not shown), and the piston body 2 is provided with a threaded through hole (not shown) for connection with the screw. Figure 2 As shown, in another embodiment, the piston body 2 and the inner wall of the piston cavity 10 are clearance-fitted, and the throttling channel 20 includes a radial gap between the piston body 2 and the inner wall of the piston cavity 10. Specifically, the size of the radial gap corresponding to the throttling channel 20 can be flexibly adjusted to adapt to a preset simulated foot feel.

[0057] In one embodiment, a sealing ring 12 fixed to the housing 1 is further included. The sealing ring 12 is sealed to the through hole 11 and the transmission rod 3. The transmission rod 3 slides through the inner hole of the sealing ring 12. The sealing ring 12 is used to seal the radial gap between the through hole 11 and the transmission rod 3. A sliding seal is formed between the sealing ring 12 and the transmission rod 3 to prevent brake fluid 5 leakage. In one embodiment, the sealing ring 12 is embedded in the inner wall of the through hole 11.

[0058] Furthermore, in one embodiment, the piston body 2 is provided with a fluid passage 23 axially connecting both ends of the piston body 2. A one-way valve 22 is provided on the fluid passage 23, which is used to block the fluid passage 23 in one direction, so that the brake fluid 5 can only flow from the side of the piston body 2 near the spring module 4 to the other side within the fluid passage 23. By providing the one-way valve 22 and the fluid passage 23, when the piston body 2 moves towards the spring module 4, the brake fluid 5 on the side of the piston body 2 near the spring module 4 can be transferred to the other side of the piston body 2 through the one-way valve 22, reducing the damping effect of the throttling channel 20 and improving the braking response corresponding to the spring module 4. During reset, the fluid passage 23 blocks the one-way valve 22, so that the brake fluid 5 can only be transferred from the throttling channel 20 to the side of the piston body 2 near the spring module 4, ensuring the rebound damping effect.

[0059] Furthermore, since the piston body 2 compresses the air in the piston cavity 10 when it enters, if the brake fluid 5 fills the piston cavity 10 during the movement of the piston body 2 toward the elastic module 4, the brake fluid 5 will be difficult to compress, thus hindering the movement of the piston body 2 and affecting the compression of the elastic module 4, causing a deviation in the foot feel simulation. To solve the above problem, in one embodiment, during the movement of the piston body 2, a gap is always maintained between the top surface of the brake fluid 5 and the inner wall of the piston cavity 10 to ensure that even when the piston body 2 moves to its limit toward the elastic module 4, there is always space in the piston cavity 10 for the piston body 2 to enter.

[0060] Furthermore, in one embodiment, a buffer pad 61 is also included, which is fixed to one or both ends of the piston cavity 10 along the axial direction.

[0061] Furthermore, in one embodiment, a buffer spring element 62 is also included. The buffer spring element 62 abuts against the end of the piston body 2 away from the spring module 4. As the piston body 2 moves away from the spring module 4, the buffer spring element 62 stores energy to dampen the piston body 2. This, combined with the flow of the brake fluid 5, creates a composite damping effect. Specifically, in one embodiment, the buffer spring element 62 is a wire spring; in other embodiments, the buffer spring element 62 includes one or more of a disc spring, a wire spring, and rubber.

[0062] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on the explanation herein, those skilled in the art can conceive of other specific embodiments of this utility model without creative effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. An integrated brake pedal feel simulator, comprising: The housing (1) has an axially extending piston chamber (10) inside the housing (1). The piston body (2) is axially slidably disposed within the piston cavity (10); The transmission rod (3) is fixed on the piston body (2). The housing (1) has a through hole (11) at one end of the piston cavity (10) that is adapted to the transmission rod (3). The transmission rod (3) passes through the through hole (11) and extends out of the piston cavity (10). The elastic module (4) is located inside the piston cavity (10) and abuts against the end of the piston body (2) away from the transmission rod (3); When the transmission rod (3) receives external force, the piston body (2) moves toward the elastic module (4). During this process, the elastic module (4) elastically deforms and stores energy and applies a rebound force to the piston body (2). When the external force on the transmission rod (3) disappears, the elastic module (4) is used to push the piston body (2) to move away from the elastic module (4) to reset; Its characteristic is that it further includes: A preset volume of brake fluid (5) is sealed inside the piston chamber (10); Axially connected throttling channels (20) at both ends of the piston body (2); As the piston body (2) reciprocates, some of the brake fluid (5) passes through the throttling channel (20) to transfer between the two sides of the piston body (2) in the axial direction.

2. The integrated brake pedal foot feel simulator according to claim 1, characterized in that: The throttling channel (20) is disposed on the piston body (2) and / or between the piston body (2) and the inner wall of the piston chamber (10).

3. The integrated brake pedal feel simulator according to claim 1, characterized in that: A sealing ring (12) is fixed on the housing (1). The sealing ring (12) is sealed to the through hole (11) and the transmission rod (3). The transmission rod (3) slides through the inner hole of the sealing ring (12). The sealing ring (12) is used to seal the gap between the through hole (11) and the transmission rod (3) in the radial direction.

4. The integrated brake pedal feel simulator according to claim 1, characterized in that: The piston body (2) is provided with a fluid passage (23) axially connecting both ends of the piston body (2). A one-way valve (22) is provided on the fluid passage (23). The one-way valve (22) is used to block the fluid passage (23) in one direction, so that in the fluid passage (23), the brake fluid (5) can only flow from the side of the piston body (2) near the elastic module (4) to the other side.

5. An integrated brake pedal feel simulator according to claim 1, characterized in that: During the movement of the piston body (2), there is always a gap between the top surface of the brake fluid (5) and the inner wall of the piston cavity (10).

6. An integrated brake pedal feel simulator according to claim 1, characterized in that: It also includes a buffer pad (61) fixed to one or both ends of the piston chamber (10) in the axial direction.

7. An integrated brake pedal feel simulator according to claim 1, characterized in that: It also includes a buffer elastic element (62), which abuts against the end of the piston body (2) away from the elastic module (4). During the process of the piston body (2) moving away from the elastic module (4), the buffer elastic element (62) stores energy to generate damping on the piston body (2).

8. An integrated brake pedal feel simulator according to claim 2, characterized in that: The throttling channel (20) includes a through hole that passes through the piston body (2).

9. An integrated brake pedal feel simulator according to claim 2, characterized in that: The piston body (2) and the inner wall of the piston cavity (10) are fitted with a clearance, and the throttling channel (20) includes a radial clearance between the piston body (2) and the inner wall of the piston cavity (10).

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