Brake pedal foot feeling simulator with springback damping function

Abstract

The invention relates to the field of brake pedal foot feeling simulators, in particular to a brake pedal foot feeling simulator with a springback damping function, comprising: a shell in which a piston cavity extending axially is arranged; the piston main body is axially arranged in the piston cavity in a sliding manner; the transmission rod is fixed to the piston body, a penetrating hole matched with the transmission rod is formed in the axial end, corresponding to the piston cavity, of the shell, the transmission rod penetrates through the penetrating hole and extends out of the piston cavity, and the transmission rod is in transmission connection with an external brake pedal; the elastic module abuts against the end, away from the transmission rod, of the piston body. The brake fluid is sealed in the piston cavity; and the throttling runner is axially communicated with the two ends of the piston main body. The reset speed of the piston body and the brake pedal can be slowed down, and springback and foot hitting are prevented.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of brake pedal feel simulator, in particular to a brake pedal feel simulator with rebound damping function. BACKGROUND

[0002] In the field of automobiles, the electronic brake system is different from the brake system of traditional fuel vehicles. In the electronic brake system, the brake pedal can be understood as a brake signal input button. The damping feeling generated by stepping on the brake is fed back through a simulator. In the brake pedal feel simulator of the general EHB (electronic hydraulic brake system), the elastic force generated by the combination of disc springs is fed back to the external hydraulic circuit, and the hydraulic circuit provides damping feeling to simulate the damping feeling of stepping on the pedal.

[0003] However, the newly launched EMB (electronic mechanical brake system) cancels the hydraulic circuit compared with the EHB. If a pure elastic element is used to provide the reset force of the pedal simulator, the following defects exist: On the one hand, the reaction force generated by the pure elastic element (such as a linear spring) is single, and it is difficult to simulate the foot feeling of the brake pedal of the traditional automobile, which will cause discomfort to the drivers who have formed the driving habit of traditional automobiles; On the other hand, when the pedal is released, the elastic element will push the pedal to reset suddenly, which will cause the rebound to kick the foot. SUMMARY

[0004] In order to overcome the above-mentioned defects of the prior art, the present application provides a brake pedal feel simulator with rebound damping function, which can provide composite damping, facilitate simulation of the foot feeling of the brake pedal of the traditional automobile, and prevent the pedal from rebounding and kicking the foot suddenly.

[0005] In order to achieve the above-mentioned purpose, the present application is realized by the following technical scheme: A brake pedal feel simulator with rebound damping function, comprising: A housing, an axially extending piston cavity is arranged in the housing; A piston body, the piston body is arranged in the piston cavity and slides axially; A transmission rod, the transmission rod is fixed on the piston body, and the housing is provided with a through hole corresponding to the axial end of the piston cavity and adapted to the transmission rod, the transmission rod extends out of the piston cavity through the through hole, and the transmission rod is used for driving connection with an external brake pedal to receive external force; A spring module, the spring module is arranged in the piston cavity and abuts against the end of the piston body away from the transmission rod; When the transmission rod receives external force, i.e. in the process of stepping on the brake pedal, the piston body moves towards the spring module side, and the spring module elastically deforms and applies a rebound force to the piston body in this process. When the external force on the transmission rod disappears, i.e. when the brake pedal is released, the elastic module is used to push the piston body to move to the side away from the elastic module for resetting; Further comprising: A preset volume of brake fluid is sealed in the piston cavity; A throttling flow channel axially connecting both ends of the piston body; When the piston body axially reciprocates in the piston cavity, part of the brake fluid is transferred between the two axial sides of the piston body through the throttling flow channel.

[0006] Based on the above device, the application provides a brake pedal foot feeling simulator with a rebound damping function, and the principle is: During the process of stepping on the brake pedal, the piston body moves to the side of the elastic module, and in this process, the elastic module is elastically deformed to store energy and apply a rebound force to the piston body to partially correspond to the damping of stepping on the brake pedal, and in this process, part of the brake fluid is transferred from the side of the piston body close to the elastic module to the side of the piston body away from the elastic module through the throttling flow channel; When the brake pedal is released, the elastic module is used to push the piston body to move to the side away from the elastic module for resetting, and in this process, the brake fluid located on the side of the piston body away from the elastic module is transferred to the side of the piston body close to the elastic module through the throttling flow channel.

[0007] Further, the brake pedal foot feeling simulator with a rebound damping function in the application, the throttling flow channel is arranged on the piston body and / or between the piston body and the inner wall of the piston cavity.

[0008] Further, the brake pedal foot feeling simulator with a rebound damping function in the application, the sealing ring fixed to the housing, the sealing ring is in sealing connection with the through hole and the transmission rod, the transmission rod is slidably arranged in the inner hole of the sealing ring, and the sealing ring is used to seal the gap between the through hole and the transmission rod in the radial direction. As a preferred solution of the application, a sliding seal is formed between the sealing ring and the transmission rod, which is used to prevent brake fluid leakage.

[0009] Further, the brake pedal foot feeling simulator with rebound damping function in the application is provided with a through liquid flow channel axially communicating with both ends of the piston body, and a one-way valve is arranged on the through liquid flow channel, and the one-way valve is used for one-way blocking the through liquid flow channel, so that in the through liquid flow channel, the brake fluid can only flow from the side of the piston body close to the elastic module to the other side. As the preferred scheme of the application, by arranging the one-way valve and the through liquid flow channel, when the piston body moves to the side of the elastic module, the brake fluid close to the side of the elastic module of the piston body can be transferred to the other side of the piston body through the one-way valve, the damping effect of the throttle flow channel is reduced, and the brake response corresponding to the elastic module is improved. When resetting, the through liquid flow channel blocks the one-way valve, so that the brake fluid can only be transferred from the throttle flow channel to the side of the piston body close to the elastic module, so as to ensure the rebound damping effect.

[0010] Further, the brake pedal foot feeling simulator with rebound damping function in the application is provided with a through liquid flow channel axially communicating with both ends of the piston body, and a one-way valve is arranged on the through liquid flow channel, and the one-way valve is used for one-way blocking the through liquid flow channel, so that in the through liquid flow channel, the brake fluid can only flow from the side of the piston body close to the elastic module to the other side. As the preferred scheme of the application, by arranging the one-way valve and the through liquid flow channel, when the piston body moves to the side of the elastic module, the brake fluid close to the side of the elastic module of the piston body can be transferred to the other side of the piston body through the one-way valve, the damping effect of the throttle flow channel is reduced, and the brake response corresponding to the elastic module is improved. When resetting, the through liquid flow channel blocks the one-way valve, so that the brake fluid can only be transferred from the throttle flow channel to the side of the piston body close to the elastic module, so as to ensure the rebound damping effect.

[0011] Because the piston body compresses the air in the piston cavity when entering the piston cavity, if the brake fluid can fill the piston cavity during the movement of the piston body to the side of the elastic module, the movement stroke of the piston body will be hindered due to the difficulty of compression of the brake fluid, and the compression amount of the elastic module is affected, so that the foot feeling simulation deviates.

[0012] Further, the brake pedal foot feeling simulator with rebound damping function in the application further comprises a buffer pad fixed to one end or both ends of the piston cavity.

[0013] Further, the brake pedal foot feeling simulator with rebound damping function in the application further comprises a buffer elastic member abutting against the side of the piston body away from the elastic module, and the buffer elastic member stores energy to generate damping to the piston body during the movement of the piston body to the side away from the elastic module. The flow of the brake fluid forms a composite damping effect.

[0014] Further, the brake pedal foot feeling simulator with rebound damping function in the application is provided with a through liquid flow channel axially communicating with both ends of the piston body, and a one-way valve is arranged on the through liquid flow channel, and the one-way valve is used for one-way blocking the through liquid flow channel, so that in the through liquid flow channel, the brake fluid can only flow from the side of the piston body close to the elastic module to the other side. As the preferred scheme of the application, by arranging the one-way valve and the through liquid flow channel, when the piston body moves to the side of the elastic module, the brake fluid close to the side of the elastic module of the piston body can be transferred to the other side of the piston body through the one-way valve, the damping effect of the throttle flow channel is reduced, and the brake response corresponding to the elastic module is improved. When resetting, the through liquid flow channel blocks the one-way valve, so that the brake fluid can only be transferred from the throttle flow channel to the side of the piston body close to the elastic module, so as to ensure the rebound damping effect.

[0015] Further, the brake pedal foot feeling simulator with rebound damping function in the application is provided with a through liquid flow channel axially communicating with both ends of the piston body, and a one-way valve is arranged on the through liquid flow channel, and the one-way valve is used for one-way blocking the through liquid flow channel, so that in the through liquid flow channel, the brake fluid can only flow from the side of the piston body close to the elastic module to the other side. As the preferred scheme of the application, by arranging the one-way valve and the through liquid flow channel, when the piston body moves to the side of the elastic module, the brake fluid close to the side of the elastic module of the piston body can be transferred to the other side of the piston body through the one-way valve, the damping effect of the throttle flow channel is reduced, and the brake response corresponding to the elastic module is improved. When resetting, the through liquid flow channel blocks the one-way valve, so that the brake fluid can only be transferred from the throttle flow channel to the side of the piston body close to the elastic module, so as to ensure the rebound damping effect.

[0016] The above technical scheme can be seen that the application has the following beneficial effects: The application provides a brake pedal foot feeling simulator with rebound damping function. Because the opening area of the throttle flow channel is small compared with the throttle area of the piston body, resistance is generated due to the difficulty in quick balance of fluid pressure on both sides of the piston body during reciprocating movement of the piston body, hydraulic damping effect is formed, so that: During the process of stepping on the brake pedal, the generated hydraulic damping, combined with the elastic force of the elastic module, makes the force to be overcome when stepping on the pedal be the composite damping formed by the hydraulic damping and the elastic force of the elastic module, so as to simulate the foot feeling of the traditional automobile brake pedal. When the brake pedal rebounds and resets, the speed of the piston body and the brake pedal can be slowed down, and rebounding feet can be prevented. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a schematic diagram of the principle of the brake pedal foot feeling simulator with rebound damping function in an embodiment of the application (the throttle flow channel is arranged in the piston body); Figure 2 It is a schematic diagram of the principle of the brake pedal foot feeling simulator with rebound damping function in an embodiment of the application (the throttle flow channel is arranged between the piston body and the piston cavity in the radial direction).

[0018] In the figure: 1 - housing; 10 - piston cavity; 11 - perforation; 12 - sealing ring; 2 - piston body; 20 - throttle flow channel; 22 - one-way valve; 23 - liquid flow channel; 3 - transmission rod; 4 - elastic module; 5 - brake fluid; 61 - buffer pad; 62 - buffer elastic piece. DETAILED DESCRIPTION

[0019] In combination Figure 1 Or Figure 2 The brake pedal foot feeling simulator with rebound damping function shown in the figure comprises: The housing 1 is provided with an axially extending piston cavity 10; The piston body 2 is arranged in the piston cavity 10 to slide axially; The transmission rod 3 is fixed to the piston body 2, the housing 1 is provided with a perforation 11 corresponding to the axial end of the piston cavity 10, the transmission rod 3 extends out of the piston cavity 10 through the perforation 11, and the transmission rod 3 is used for transmission connection with an external brake pedal (not shown) to receive external force; The elastic module 4 is arranged in 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, i.e. during the process of stepping on the brake pedal, the piston body 2 moves to the side of the elastic module 4, and the elastic module 4 deforms elastically to store energy and apply rebound force to the piston body 2 during the process; When the external force on the transmission rod 3 disappears, i.e. when the brake pedal is released, the elastic module 4 is used to push the piston body 2 to move to the side away from the elastic module 4 for resetting; Further comprising: a preset volume of brake fluid 5, which is sealed in the piston cavity 10; a throttling flow channel 20 axially connecting both ends of the piston body 2; When the piston body 2 moves axially reciprocatingly in the piston cavity 10, part of the brake fluid 5 passes through the throttling flow channel 20 to be transferred between the two axial sides of the piston body 2.

[0020] Based on the above device, a brake pedal foot feeling simulator with rebound damping function, the principle is: During the process of stepping on the brake pedal, the piston body moves to the side of the elastic module 4, and in this process, the elastic module 4 is elastically deformed to store energy and apply a rebound force to the piston body to partially correspond to the damping of stepping on the brake pedal, and in this process, part of the brake fluid 5 is transferred from the side of the piston body close to the elastic module 4 to the side of the piston body away from the elastic module 4 through the throttling flow channel 20; When the brake pedal is released, the elastic module 4 is used to push the piston body to move to the side away from the elastic module 4 for resetting, and in this process, the brake fluid 5 located on the side of the piston body away from the elastic module 4 is transferred to the side of the piston body close to the elastic module 4 through the throttling flow channel 20.

[0021] Because the opening area of the throttling flow channel 20 is small enough compared to the resistance area of the piston body, during the reciprocating movement of the piston body, the fluid pressure on both sides of the piston body is difficult to quickly balance, thus generating resistance, forming a hydraulic damping effect, so that: During the process of stepping on the brake pedal, the damping is generated, and combined with the elastic force of the elastic module 4, the force to be overcome when stepping on the pedal is the composite damping formed by the hydraulic damping and the elastic force of the elastic module 4, so as to facilitate the simulation of the foot feeling of the traditional automobile brake pedal; When the brake pedal rebounds and resets, the speed of the piston body and the brake pedal can be slowed down to prevent the rebound from hitting the foot.

[0022] In an embodiment, the elastic module 4 includes a set of stacked disc springs, and in other embodiments, the elastic module 4 includes one or more of disc springs, wire springs, and rubber.

[0023] Specifically, the throttling flow channel 20 is arranged on the piston body 2 and / or between the piston body 2 and the inner wall of the piston cavity 10. Figure 1In an embodiment, the throttle flow channel 20 comprises through holes on the piston body 2. In particular, the size and number of the through holes corresponding to the throttle flow channel 20 can be flexibly adjusted to adapt to the preset simulated foot feeling. In an embodiment, the through holes can be directly machined on the piston body 2, and in another embodiment, the through holes are provided on a screw (not shown), and the piston body 2 is provided with a threaded hole (not shown) connected with the screw. In combination Figure 2 In another embodiment, the piston body 2 and the inner wall of the piston cavity 10 are in clearance fit, and the throttle flow channel 20 comprises the radial clearance between the piston body 2 and the inner wall of the piston cavity 10. In particular, the size of the radial clearance corresponding to the throttle flow channel 20 can be flexibly adjusted to adapt to the preset simulated foot feeling.

[0024] In an embodiment, further comprising a sealing ring 12 fixed on the housing 1, the sealing ring 12 is in sealing connection with the through hole 11 and the transmission rod 3, the transmission rod 3 is slidably arranged in the inner hole of the sealing ring 12, and the sealing ring 12 is used to seal the gap between the through hole 11 and the transmission rod 3 in the radial direction. Wherein, the sliding seal is formed between the sealing ring 12 and the transmission rod 3, which is used to prevent the brake fluid 5 from leaking, and in an embodiment, the sealing ring 12 is embedded in the inner wall of the through hole 11.

[0025] Further, in an embodiment, the piston body 2 is provided with a liquid passage 23 axially communicating between both ends of the piston body 2, and a one-way valve 22 is arranged on the liquid passage 23, which is used to one-way block the liquid passage 23, so that in the liquid passage 23, the brake fluid 5 can only flow from one side of the piston body 2 close to the elastic module 4 to the other side. By arranging the one-way valve 22 and the liquid passage 23, when the piston body 2 moves towards the elastic module 4 side, the brake fluid 5 close to the elastic module 4 side of the piston body 2 can be transferred to the other side of the piston body 2 through the one-way valve 22, reducing the damping effect of the throttle flow channel 20 and improving the corresponding brake response of the elastic module 4. When resetting, the liquid passage 23 blocks the one-way valve 22, so that the brake fluid 5 can only be transferred from the throttle flow channel 20 to the side of the piston body 2 close to the elastic module 4, to ensure the rebound damping effect.

[0026] In addition, when the piston body 2 enters the piston cavity 10, the air in the piston cavity 10 will be compressed, and if the brake fluid 5 can fill the piston cavity 10 during the movement of the piston body 2 towards the elastic module 4 end, it will hinder the movement of the piston body 2 because the brake fluid 5 is difficult to be compressed, and affect the compression amount of the elastic module 4, so that the foot feeling simulation deviates. In order to solve the above problem, further, in an embodiment, 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 to ensure that there is always space for the piston body 2 to enter even when the piston body 2 moves to the limit towards the elastic module 4 end.

[0027] Further, in an embodiment, a buffer pad 61 is fixed to one or both axial ends of the piston cavity 10.

[0028] Further, in an embodiment, a buffer spring 62 is arranged at the end of the piston body 2 away from the elastic module 4, and the buffer spring 62 stores energy to generate damping to the piston body 2 during the movement of the piston body 2 away from the elastic module 4. In combination with the flow of the brake fluid 5, a composite damping effect is formed. Specifically, in an embodiment, the buffer spring 62 comprises a wire spring; in other embodiments, the buffer spring 62 comprises one or more of a disc spring, a wire spring, and rubber.

[0029] The technical principles of the present application are described above in combination with specific embodiments, and these descriptions are only for explaining the principles of the present application, and cannot be interpreted in any way as a limitation on the protection scope of the present application. Based on the explanations herein, other specific embodiments of the present application can be conceived by those skilled in the art without creative labor, and these embodiments will all fall within the protection scope of the present application.

Claims

1. A brake pedal feel simulator with rebound damping function, 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. A brake pedal foot feel simulator with rebound damping function 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. A brake pedal foot feel simulator with rebound damping function 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. A brake pedal foot feel simulator with rebound damping function 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. A brake pedal foot feel simulator with rebound damping function 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. A brake pedal foot feel simulator with rebound damping function 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. A brake pedal foot feel simulator with rebound damping function 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. A brake pedal foot feel simulator with rebound damping function according to claim 2, characterized in that: The throttling channel (20) includes a through hole that passes through the piston body (2).

9. A brake pedal foot feel simulator with rebound damping function 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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