A multi-cavity composite damping brake pedal feel simulator

Abstract

The utility model relates to brake pedal foot feeling simulator field, concretely relates to a kind of multi-cavity composite damping brake pedal foot feeling simulator. Including: piston shell, piston shell is equipped with the piston cavity of axial extension;Piston main body, piston main body is axially slidably arranged in piston cavity;Transmission rod, transmission rod is fixed on piston main body, and the axial one end of piston shell corresponding piston cavity is equipped with the perforation compatible with transmission rod, and transmission rod extends out piston cavity outside by perforation, and transmission rod is connected with outside brake pedal transmission;Elastic module, elastic module is set in piston cavity, and with piston main body far from the abutment of one end of perforation;Throttling flow passage that axially communicates both ends of piston main body;Liquid return cavity, liquid return cavity is located piston shell outside, and the bottom of piston cavity is communicated with liquid return cavity between liquid return flow passage;Brake fluid, brake fluid is sealed in liquid return cavity and piston cavity. Composite damping can be provided, the foot feeling of the brake pedal of traditional car is simulated conveniently, and sudden rebound of pedal can be prevented.

Description

Technical Field

[0001] This utility model relates to the field of brake pedal feel simulators, specifically to a multi-cavity composite damping 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 a multi-cavity composite damping brake pedal foot feel simulator, which can provide composite damping, conveniently simulate the foot feel of a traditional car brake pedal, and 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] A multi-cavity composite damping brake pedal foot feel simulator, comprising:

[0009] Piston housing, with an axially extending piston chamber inside the piston housing;

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

[0011] The transmission rod is fixed to the piston body. The piston shell has a through hole at one end corresponding to the piston cavity, which is adapted to the transmission rod. The transmission rod passes through the through hole and extends out of the piston cavity. The transmission rod 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 throttling flow channel axially connecting both ends of the piston body;

[0017] The return fluid chamber is located on the outside of the piston housing, and a return fluid flow channel connects the bottom of the piston chamber to the return fluid chamber; the opening of the return fluid flow channel on the piston chamber is always located on the side of the piston body near the elastic module.

[0018] Brake fluid is sealed in the return chamber and the piston chamber. The piston body can fill the piston chamber at least during the movement of the piston body toward the spring module. The level of brake fluid in the return chamber is higher than the opening of the return flow channel on one side of the return chamber.

[0019] Based on the above device, the principle of the multi-cavity composite damping brake pedal foot feel simulator is as follows: During the process of the brake pedal being pressed, the piston body moves towards 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, part 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. As the transmission rod enters the piston cavity, after the brake fluid fills the piston cavity, the brake fluid will be discharged from the piston cavity into the return cavity through the return channel, and the brake fluid level in the return cavity will rise.

[0020] 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 on the side of the piston body away from the spring module is transferred to the side of the piston body near the spring module through the throttling channel. As the transmission rod moves out of the piston chamber, when all the brake fluid on the side of the piston body away from the spring module is transferred to the other side of the piston body, the corresponding volume of brake fluid is drawn into the piston chamber from the return chamber through the return channel.

[0021] Furthermore, in a multi-cavity composite damping brake pedal feel simulator of this application, the return fluid cavity includes an annular cavity surrounding the outer periphery of the piston housing and a bottom cavity fitted to the bottom of the piston housing, with the annular cavity extending above the bottom cavity. Based on this structure, it helps to improve the heat dissipation performance of the brake fluid within the piston cavity.

[0022] Furthermore, the multi-cavity composite damping brake pedal foot feel simulator of this application also includes a housing, which is sleeved and fixed outside the piston housing, and the return fluid chamber is disposed between the piston housing and the housing. Based on the above structure, it has the advantage of compact structure.

[0023] Furthermore, in a multi-cavity composite damping brake pedal foot 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 cavity.

[0024] Furthermore, in this application, a multi-cavity composite damping brake pedal feel simulator includes a sealing ring fixed to the piston 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.

[0025] Furthermore, in a multi-cavity composite damping brake pedal foot 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.

[0026] Furthermore, in the multi-cavity composite damping brake pedal foot feel simulator of this application, during the movement of the piston body, there is always a gap between the brake fluid level and the inner wall of the return fluid 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.

[0027] When the piston body enters the piston chamber, it compresses the air in the piston chamber. If the brake fluid can fill the return chamber while the piston body is moving towards 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.

[0028] Furthermore, the multi-cavity composite damping brake pedal foot feel simulator of this application also includes a buffer pad fixed to one or both ends of the piston cavity axially.

[0029] Furthermore, the multi-cavity composite damping brake pedal foot feel simulator of this application also includes a buffer elastic element. The buffer elastic element abuts against the end of the piston body away from the elastic module. As the piston body moves towards the side away from the elastic module, the buffer elastic element stores energy to generate damping on the piston body. Combined with the flow of brake fluid, this forms a composite damping effect.

[0030] As can be seen from the above technical solution, this utility model has the following beneficial effects:

[0031] This invention provides a multi-cavity composite damping brake pedal foot feel simulator. Because the opening area of ​​the throttling channel is sufficiently small compared to the flow-blocking area of ​​the piston body, resistance is generated during the reciprocating movement of the piston body due to the difficulty in quickly balancing the fluid pressure on both sides of the piston body, thus creating a hydraulic damping effect. Similarly, the return channel also provides a damping effect. Therefore:

[0032] 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.

[0033] 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.

[0034] In addition, once the brake fluid fills the piston chamber, the piston body can reduce the formation of air bubbles during its movement, thereby reducing noise. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of a multi-cavity composite damping brake pedal foot feel simulator according to an embodiment of this application.

[0036] In the diagram: 1-Piston housing; 10-Piston chamber; 101-Return fluid channel; 11-Perforation; 12-Sealing ring; 2-Piston body; 20-Throttle channel; 22-One-way valve; 23-Fluid passage; 3-Drive rod; 4-Elastic module; 5-Brake fluid; 61-Buffer pad; 62-Buffer elastic component; 9-Shell; 90-Return fluid chamber; 901-Ring cavity; 902-Bottom cavity. Detailed Implementation

[0037] Combination Figure 1 The multi-cavity composite damping brake pedal foot feel simulator shown includes:

[0038] Piston housing 1, with an axially extending piston chamber 10 inside the piston housing 1;

[0039] Piston body 2, which is axially slidably disposed within piston cavity 10;

[0040] The transmission rod 3 is fixed on the piston body 2. The piston shell 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.

[0041] Elastic module 4 is disposed in piston cavity 10 and abuts against the end of piston body 2 away from transmission rod 3;

[0042] 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.

[0043] 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.

[0044] A throttling channel 20 is axially connected to both ends of the piston body 2;

[0045] The return fluid chamber 90 is located on the outside of the piston housing 1. The piston chamber 10 and the return fluid chamber 90 are connected by a return fluid flow channel 101. The return fluid flow channel 101 is always located on the side of the piston body 2 near the elastic module 4. Specifically, the opening of the return fluid flow channel 101 near the piston chamber 10 is located on the side of the piston chamber 10 away from the perforation 11.

[0046] Brake fluid 5 is sealed in return chamber 90 and piston chamber 10. During the movement of piston body 2 toward elastic module 4, brake fluid 5 can fill piston chamber 10. The level of brake fluid 5 in return chamber 90 is higher than the opening of return flow channel 101 on one side of return chamber 90. Specifically, in this embodiment, piston chamber 10 is always filled with brake fluid 5.

[0047] As the piston body 2 moves axially back and forth within the piston chamber 10, the level of the brake fluid 5 in the return chamber 90 fluctuates accordingly.

[0048] Based on the above device, the principle of a multi-cavity composite damping brake pedal foot feel simulator in this embodiment is as follows: During the process of the brake pedal being pressed, the piston body moves towards 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. As the transmission rod 3 enters the piston cavity 10, after the brake fluid 5 fills the piston cavity 10, the brake fluid 5 will be discharged from the piston cavity 10 into the return cavity 90 through the return channel 101, and the level of the brake fluid 5 in the return cavity 90 will rise.

[0049] When the brake pedal is released, the spring module 4 pushes 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. As the transmission rod 3 moves out of the piston chamber 10, when all the brake fluid 5 located on the side of the piston body away from the spring module 4 is transferred to the other side of the piston body, the corresponding volume of brake fluid 5 is drawn into the piston chamber 10 from the return chamber 90 through the return channel 101.

[0050] Because the opening area of ​​the throttling channel 20 is small enough compared to the obstruction area of ​​the piston body, the piston body experiences resistance during reciprocating movement due to the difficulty in quickly balancing the fluid pressure on both sides of the piston body, resulting in a hydraulic damping effect. Similarly, the return channel 101 also provides a damping effect.

[0051] Therefore, during the process of the brake pedal being pressed, the hydraulic damping generated, combined with the elasticity of the elastic module 4, makes the force overcome by pressing the pedal a composite damping formed by the hydraulic damping and the elasticity of the elastic module 4, so as to facilitate the simulation of the foot feel of a traditional car brake pedal.

[0052] 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.

[0053] 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.

[0054] In this embodiment, the return cavity 90 includes an annular cavity 901 covering the outer periphery of the piston housing 1 and a bottom cavity 902 fitting the bottom of the piston housing 1, with the annular cavity 901 extending above the bottom cavity 902.

[0055] Based on the above structure, it helps to improve the heat dissipation performance of the brake fluid 5 in the piston chamber 10.

[0056] In this embodiment, a sleeve 9 is also included. The sleeve 9 is sleeved and fixed outside the piston shell 1, and the return fluid chamber 90 is disposed between the piston shell 1 and the sleeve 9.

[0057] Based on the above structure, it has the advantage of being compact.

[0058] In this embodiment, 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.

[0059] In this embodiment, the throttling channel 20 includes a through hole passing through the piston body 2. Specifically, in one embodiment, the through hole can be directly machined into the piston body 2; in another embodiment, the through hole passes through a screw (not shown), and the piston body 2 has a threaded through hole (not shown) for connection with the screw. In other embodiments, the piston body 2 and the inner wall of the piston cavity 10 are clearance-fitted, and the throttling channel 20 includes a radial clearance between the piston body 2 and the inner wall of the piston cavity 10.

[0060] In this embodiment, a sealing ring 12 is fixed on the piston 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 radial gap between the through hole 11 and the transmission rod 3.

[0061] The sealing ring 12 forms a sliding seal with the transmission rod 3 to prevent brake fluid 5 from leaking. In one embodiment, the sealing ring 12 is embedded in the inner wall of the perforation 11.

[0062] In this embodiment, the piston body 2 is provided with a fluid passage 23 that axially connects the two 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 the brake fluid 5 can only flow from the side of the piston body 2 near the elastic module 4 to the other side in the fluid passage 23.

[0063] By setting a one-way valve 22 and a fluid passage 23, the piston body 2 moves towards the elastic module 4. The brake fluid 5 on the side of the piston body 2 near the elastic 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 passage 20 and improving the braking response corresponding to the elastic 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 passage 20 to the side of the piston body 2 near the elastic module 4, thus ensuring the rebound damping effect.

[0064] In this embodiment, during the movement of the piston body 2, there is always a gap between the liquid level of the brake fluid 5 and the inner wall of the return fluid chamber 90 in the return fluid chamber 90, so as to ensure that even when the piston body 2 moves to the limit towards the elastic module 4, there is always space in the piston chamber 10 for the piston body 2 to enter.

[0065] When the piston body 2 enters the piston chamber 10, it will compress the air in the piston chamber 10. If the brake fluid 5 can fill the return chamber 90 during the process of the piston body 2 moving towards the end of the elastic module 4, it will cause the brake fluid 5 to be difficult to compress, thus hindering the movement stroke of the piston body 2, affecting the compression amount of the elastic module 4, and causing the foot feel simulation to deviate.

[0066] In this 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. When the buffer pad 61 is located at the end of the piston cavity 10 away from the perforation 11, a hollow structure can be provided to avoid blocking the return fluid channel 101.

[0067] In this embodiment, a buffer elastic element 62 is also included. The buffer elastic element 62 abuts against the end of the piston body 2 away from the elastic module 4. As the piston body 2 moves away from the elastic module 4, the buffer elastic element 62 stores energy to generate damping on the piston body 2. This, combined with the flow of brake fluid 5, forms a composite damping effect.

[0068] In one embodiment, the buffer spring 62 includes a wire spring; in other embodiments, the buffer spring 62 includes one or more of a disc spring, a wire spring, and rubber.

[0069] 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. A multi-cavity composite damping brake pedal foot feel simulator, comprising: Piston housing (1), with an axially extending piston cavity (10) inside the piston 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 piston shell (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: Axially connected throttling channels (20) at both ends of the piston body (2); The return liquid chamber (90) is located on the outside of the piston shell (1). The piston chamber (10) and the return liquid chamber (90) are connected by a return liquid flow channel (101). The opening of the return liquid flow channel (101) on the piston chamber (10) is always located on the side of the piston body (2) near the elastic module (4). Brake fluid (5) is sealed in return chamber (90) and piston chamber (10). The piston body (2) is able to fill piston chamber (10) at least during the movement of the piston body (2) toward elastic module (4). The level of brake fluid (5) in return chamber (90) is higher than the opening of return flow channel (101) on one side of return chamber (90).

2. The multi-cavity composite damping brake pedal foot feel simulator according to claim 1, characterized in that: The return chamber (90) includes an annular cavity (901) covering the outer periphery of the piston shell (1) and a bottom cavity (902) fitting the bottom of the piston shell (1), with the annular cavity (901) extending above the bottom cavity (902).

3. The multi-cavity composite damping brake pedal foot feel simulator according to claim 2, characterized in that: It also includes a casing (9), which is fitted and fixed outside the piston housing (1), and a return fluid chamber (90) is located between the piston housing (1) and the casing (9).

4. The multi-cavity composite damping 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).

5. The multi-cavity composite damping brake pedal foot feel simulator according to claim 1, characterized in that: A sealing ring (12) is fixed on the piston housing (1). The sealing ring (12) is sealed to the perforation (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 perforation (11) and the transmission rod (3) in the radial direction.

6. The multi-cavity composite damping brake pedal foot 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.

7. The multi-cavity composite damping brake pedal foot feel simulator according to claim 1, characterized in that: During the movement of the piston body (2), there is always a gap between the liquid level of the brake fluid (5) and the inner wall of the return fluid chamber (90) in the return fluid chamber (90).

8. The multi-cavity composite damping brake pedal foot 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.

9. A multi-cavity composite damping brake pedal foot 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).

10. A multi-cavity composite damping brake pedal foot feel simulator according to claim 1, characterized in that: The opening of the return flow channel (101) near the piston chamber (10) is located on the side of the piston chamber (10) away from the transmission rod (3).

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