A pedal simulation mechanism and its assembly process

Abstract

The present invention discloses a pedal simulation mechanism and its assembly process. The pedal simulation mechanism includes a multi-stage elastic component and an input push rod component. The multi-stage elastic component includes a guide rod. A spring support seat, a third elastic component, and a bearing seat are sequentially mounted outside the guide rod. A second elastic component is also installed between the spring support seat and the bearing seat. At least one of the spring support seat and the bearing seat can move forward and backward relative to the guide rod. The input push rod component includes an input push rod and a first elastic component. The rear end of the input push rod is used to connect an external pedal and the front end is arranged relative to the rear end of the guide rod. The two ends of the first elastic component act on the multi-stage elastic component and the input push rod respectively to form a preload between the input push rod and the multi-stage elastic component. Its technical solution enables a total of three elastic components to gradually provide feedback force during the driver's stepping on the pedal, and the feedback force increases step by step, so that the braking feeling of the pedal simulation is more real and reliable, and the force transmission is more stable.

Description

Technical Field

[0001] The invention relates to the technical field of pedal simulation systems, and in particular to a pedal simulation mechanism and an assembly process thereof. Background Art

[0002] There are currently two types of designs for the pedal and brake systems of automobiles, one is a non-decoupling type and the other is a decoupling type.

[0003] Among them, the characteristic of the non-decoupled design is that the input push rod and the output push rod of the booster are in a linked state under any working condition. The realization of the boost is similar to that of the traditional vacuum booster. The boost size is adjusted by sensing the signal of the differential displacement sensor to adjust the output torque of the motor booster.

[0004] The decoupled design is characterized by the pedal feel being realized by a series spring load, and the input push rod and the output push rod are separated during normal braking. The power assist is adjusted based on the signal from the input push rod travel sensor to adjust the output torque of the motor power assist.

[0005] However, both of the above have technical problems:

[0006] For non-decoupled designs, since the input push rod is linked to the output push rod, the pedal will sink automatically when the power is actively assisted, which will cause the driver to feel the foot is pressed or even pinch the foot, causing comfort problems and even safety problems. At the same time, when recovering energy, it needs to be used in conjunction with the specially designed ESC to achieve 0.3g of energy recovery.

[0007] For the decoupled design, the two-stage series spring load cannot fully simulate the pedal feel, resulting in poor pedal feel authenticity. At the same time, the series spring will reduce the efficiency of the braking force, especially when the power fails, the output pressure is difficult to meet the regulatory requirements, and the matching has certain limitations. Summary of the invention

[0008] In view of the above problems existing in the prior art, a pedal simulation mechanism and an assembly process thereof are provided to make the braking feeling of pedal simulation more realistic and reliable and the force transmission more stable, so as to overcome the above technical defects.

[0009] The specific technical solutions are as follows:

[0010] A pedal simulation mechanism includes a multi-stage elastic component and an input push rod component arranged front and back relative to each other, wherein:

[0011] The multi-stage elastic component includes a guide rod, and a spring support seat, a third elastic member and a bearing seat are sequentially mounted on the outer circumference of the guide rod from back to front, and a second elastic member is also installed between the spring support seat and the bearing seat, and at least one of the spring support seat and the bearing seat can move forward and backward relative to the guide rod;

[0012] The input push rod assembly includes an input push rod and a first elastic component sleeved on the outer periphery of the input push rod. The rear end of the input push rod is used to connect to the external pedal, while the front end is arranged opposite to the rear end of the guide rod. The two ends of the first elastic component act on the multi-stage elastic component and the input push rod respectively to form a preload between the input push rod and the multi-stage elastic component.

[0013] Preferably, the outer periphery of the input push rod is also covered with a front dust cover and a rear dust cover which are arranged adjacent to each other, and the two ends of the first elastic member are respectively against the front dust cover and the spring support seat.

[0014] Preferably, it also includes an outer shell, which is generally cylindrical with an open front end, and has an interior that is used to accommodate at least a portion of the input push rod assembly and at least a portion of the multi-stage elastic assembly. A mounting hole is provided on the rear end surface of the outer shell for passing the input push rod, and a front dust cover and a rear dust cover are respectively tightly attached to the front and rear sides of the mounting hole and clamp the outer shell to allow the outer shell to move synchronously with the input push rod.

[0015] Preferably, a shaft hole is formed at the rear end of the guide rod, and at least a portion of the front end of the input push rod extends into the shaft hole.

[0016] Preferably, the spring support seat is fixedly mounted on the outer periphery of the guide rod, and the bearing seat is movably sleeved on the outer periphery of the guide rod and can move forward and backward along the outer periphery of the guide rod.

[0017] Preferably, the first elastic component is a conical coil spring, the second elastic component is a cylindrical coil spring, and the third elastic component is a shock-absorbing spring block.

[0018] Preferably, there is a gap between the third elastic member and the bearing seat.

[0019] Preferably, the rear end surface of the bearing seat is also recessed forward to form an annular mounting groove, and a bearing is embedded in the annular mounting groove, the inner ring of the bearing is fitted with the inner edge of the annular mounting groove, and the outer ring of the bearing can rotate freely.

[0020] Preferably, it also includes a sleeve and a fixing ring, and the fixing ring is mounted on the outer periphery of the outer shell and allows the outer shell to move forward and backward relative to the fixing ring. The sleeve as a whole is a cylindrical structure with an open front end and is mounted on the outer periphery of the fixing ring. The front end of the sleeve has a through hole for passing the input push rod, and the outer shell is accommodated inside the sleeve.

[0021] The present invention also provides an assembly process based on the above-mentioned pedal simulation mechanism, including a process of assembling a multi-stage elastic component, a process of assembling an input push rod component, and a process of assembling the multi-stage elastic component and the input push rod component into one body; wherein,

[0022] The process of assembling a multi-stage elastic component includes:

[0023] Step a, press the inner hole of the bearing into the bearing seat with interference fit, and ensure that the outer ring of the bearing can rotate freely;

[0024] Step b, the guide rod passes through the bearing seat from front to back, and the third elastic member and the second elastic member are sequentially mounted on the outer periphery of the guide rod;

[0025] Step c, using a fixture to assemble the spring support seat to the rear end of the guide rod and weld it to fix it;

[0026] Step d, testing the forces of the second elastic member and the third elastic member;

[0027] The process of assembling the input push rod assembly includes:

[0028] Step e, insert the rear dust cover onto the outer periphery of the input push rod from the back to the front, and push it to the limit position in the rear annular positioning groove;

[0029] Step f, the front end of the input push rod passes through the mounting through hole of the housing from back to front until the rear end of the housing abuts against the rear dust cover;

[0030] Step g, inserting the front dust cover into the outer periphery of the input push rod from front to back, and pushing it to the limit position in the front annular positioning groove, at this time, the front dust cover and the rear dust cover are closely attached to and clamp the housing;

[0031] Step h, fitting the first elastic member onto the outer periphery of the input push rod from front to back, with the rear end of the first elastic member abutting against the front dust cover;

[0032] The process of assembling the multi-stage elastic assembly and the input push rod assembly into one piece includes:

[0033] Step i, inserting at least a portion of the fixing ring into the sheath from front to back and fastening and fixing them to each other;

[0034] Step j, inserting the input push rod assembly into the sheath from front to back, and the outer shell slides backward along the guide groove on the inner wall of the fixing ring, and the rear end of the input push rod passes through the through hole of the sheath;

[0035] Step k, at least a portion of the multi-stage elastic component is installed into the housing from front to back, and the spring support seat and the front dust cover abut against the first elastic component, and the front end of the input push rod extends into the axial hole at the rear end of the guide rod.

[0036] The beneficial effects of the above technical solution are:

[0037] The pedal simulation mechanism includes a multi-stage elastic component and an input push rod component. The input push rod component includes an input push rod and a first elastic component. The multi-stage elastic component includes a guide rod, a spring support seat, a third elastic component, a bearing seat, and a second elastic component. In a specific application, when the pedal connected to the rear end of the input push rod is gradually subjected to force to prompt the input push rod to move forward, the first elastic component first acts and provides a reverse feedback force to the input push rod and the pedal to simulate a preliminary pedal braking feeling. Then, the first elastic component promotes the relative movement between the spring support seat and the bearing seat, so that the second elastic component acts and provides a reverse feedback force to the input push rod and the pedal to simulate a further pedal braking feeling. Finally, when the movement between the spring support seat and the bearing seat acts on the third elastic component, the third elastic component acts and provides a reverse feedback force to the input push rod and the pedal to simulate a further pedal braking feeling. In the process of the driver stepping on the pedal, a total of three elastic components gradually provide feedback force, and the feedback force increases step by step, so that the braking feeling simulated by the pedal is more real and reliable, and the force transmission is smoother. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a three-dimensional diagram of the pedal simulation mechanism of the present invention;

[0039] Figure 2 is a cross-sectional view of the pedal simulation mechanism of the present invention;

[0040] Figure 3 A three-dimensional diagram of the pedal simulation mechanism of the present invention with the cover removed and the pedal connection member installed;

[0041] Figure 4 It is a sectional view of the split state of the input push rod assembly and the multi-stage elastic assembly in the pedal simulation mechanism of the present invention;

[0042] Figure 5 It is a three-dimensional diagram of the assembly state of the input push rod assembly and the multi-stage elastic assembly in the pedal simulation mechanism of the present invention;

[0043] Figure 6 A three-dimensional diagram of an input push rod assembly in the pedal simulation mechanism of the present invention;

[0044] Figure 7 A three-dimensional diagram of the pedal simulation mechanism of the present invention applied to the decoupling mechanism;

[0045] Figure 8 It is a cross-sectional view of the pedal simulation mechanism of the present invention applied to the decoupling mechanism;

[0046] Fig. 9 for Figure 8 A partial cross-sectional view of

[0047] Fig.10 for Figure 7Installation diagram of the displacement sensor mechanism on the middle decoupling mechanism;

[0048] Fig.11 for Figure 7 Installation cross-sectional view of the displacement sensing mechanism on the middle decoupling mechanism;

[0049] Fig.12 for Figure 7 A three-dimensional diagram of the displacement sensing mechanism on the middle decoupling mechanism. DETAILED DESCRIPTION

[0050] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the following embodiments are combined with the accompanying drawings to explain the present invention in detail. Figure 2 The direction from left to right shown on the paper is the direction from back to front in the present invention.

[0051] Embodiment 1,

[0052] See also Figures 1 to 6 As shown in , the pedal simulation mechanism provided in this embodiment includes a multi-stage elastic component 2 and an input push rod component 1 arranged front and back relative to each other, wherein:

[0053] The multi-stage elastic assembly 2 includes a guide rod 21, and a spring support seat 22, a third elastic member 23 and a bearing seat 24 are sequentially mounted on the outer circumference of the guide rod 21 from back to front, and a second elastic member 26 is also installed between the spring support seat 22 and the bearing seat 24. At least one of the spring support seat 22 and the bearing seat 24 can move forward and backward relative to the guide rod 21;

[0054] The input push rod assembly 1 includes an input push rod 11 and a first elastic component 14 mounted on the outer periphery of the input push rod 11. The rear end of the input push rod 11 is used to connect to an external pedal while the front end is arranged opposite to the rear end of the guide rod 21. The two ends of the first elastic component 14 act on the multi-stage elastic component 2 and the input push rod 11 respectively to form a preload between the input push rod 11 and the multi-stage elastic component.

[0055] Based on the above technical solution, the pedal simulation mechanism includes a multi-stage elastic component 2 and an input push rod 11 component 1, the input push rod 11 component 1 includes the input push rod 11 and a first elastic member 14, and the multi-stage elastic component 2 includes a guide rod 21, a spring support seat 22, a third elastic member 23, a bearing seat 24, and a second elastic member 26. In a specific application, when the pedal connected to the rear end of the input push rod 11 is gradually stressed and causes the input push rod 11 to move forward, the first elastic member 14 first acts and provides a reverse feedback force to the input push rod 11 and the pedal to simulate a preliminary pedal braking feeling, and then the first elastic member 14 pushes the spring support seat 22 to move the input push rod 11 forward. The spring support seat 22 and the bearing seat 24 move relative to each other, so that the second elastic component 26 acts and provides a reverse feedback force to the input push rod 11 and the pedal to simulate a further pedal braking feeling; finally, when the movement between the spring support seat 22 and the bearing seat 24 acts on the third elastic component 23, the third elastic component 23 acts and provides a reverse feedback force to the input push rod 11 and the pedal to simulate a further pedal braking feeling, so that when the driver steps on the pedal, a total of three elastic components gradually provide feedback force, and the feedback force increases step by step, so that the braking feeling simulated by the pedal is more real and reliable, and the force transmission is smoother.

[0056] In a preferred embodiment, the periphery of the input push rod 11 is also covered with a front dust cover 13 and a rear dust cover 12 arranged adjacent to each other, and the two ends of the first elastic member 14 are respectively against the front dust cover 13 and the spring support seat 22. Further, the pedal simulation mechanism also includes a shell 3, which is in the shape of a cylinder with an open front end, and the interior of the shell 3 is formed with a receiving cavity for accommodating at least a part of the input push rod assembly 1 and at least a part of the multi-stage elastic assembly 2, and the rear end surface of the shell 3 is provided with a mounting through hole for passing the input push rod 11, and the front dust cover 13 and the rear dust cover 12 are respectively tightly attached to the front and rear sides of the mounting through hole and clamp the shell 3, so as to allow the shell 3 to move synchronously with the input push rod 11.

[0057] It is worth pointing out that the above is only the best embodiment of the present case. In fact, the housing 3 can also be directly fixed on the input push rod 11 to achieve the purpose of synchronous movement, including but not limited to clamping, riveting, welding, etc., and the rear end of the first elastic member 14 can also directly abut against the inner bottom surface of the housing 3, but it is not limited to this. In addition, it can be seen from the following content that the role of the housing 3 is to move forward and backward with the input push rod 11 together with the sensing part of the displacement sensor mechanism, so the housing can also be a bracket. At the same time, without considering the convenience of disassembly, the housing 11 and the two dust covers can also be an integrated structure with the input push rod 11. Therefore, the above is only the best embodiment of the present case, and the specific implementation plan is not limited to this.

[0058] As a further preferred embodiment, the rear end of the guide rod 21 is provided with an axial hole, and at least a portion of the front end of the input push rod 11 extends into the axial hole. Furthermore, in this embodiment, the spring support seat 22 is fixedly mounted on the outer periphery of the guide rod 21, and the bearing seat 24 is movably mounted on the outer periphery of the guide rod 21 and can move forward and backward along the outer periphery of the guide rod 21. However, it is also possible that the bearing seat 24 is fixedly connected to the guide rod 21 and the spring support seat 22 is slidably connected to the outer periphery of the guide rod 21, or both are movable, and the third elastic member 23 is fixedly mounted on the outer periphery of the guide rod 21, which can realize that the second elastic member 26 and the third elastic member 23 are sequentially urged to act in the process of the pedal being gradually stressed, and it is not limited thereto.

[0059] As a further preferred embodiment, the first elastic member 14 is a conical coil spring, the second elastic member 26 is a cylindrical coil spring, and the third elastic member 23 is a shock-absorbing spring block, but all three may also be springs. Further, there is a gap between the third elastic member 23 and the bearing seat 24. Specifically, the outer periphery of the guide rod 21 is formed with a step for limiting the front end of the third elastic member 23, and the rear end of the third elastic member 23 is limited by the front side of the spring support seat 22. Further, the rear end surface of the bearing seat 24 is also recessed forward to form an annular mounting groove, and a bearing 25 is embedded in the annular mounting groove, the inner ring of the bearing 25 is fitted with the inner edge of the annular mounting groove, and the outer ring of the bearing 25 can rotate freely.

[0060] In a preferred embodiment, the pedal simulation mechanism further includes a sheath 5 and a fixing ring 4, and the fixing ring 4 is sleeved on the outer periphery of the shell 3 and allows the shell 3 to move forward and backward relative to the fixing ring 4. The sheath 5 is a cylindrical structure with an open front end and is sleeved on the outer periphery of the fixing ring 4. The front end of the sheath 5 has a through hole for passing the input push rod 11, and the shell 3 is accommodated in the sheath 5. Further, the outer periphery of the input push rod 11 is also recessed to form a front annular positioning groove and a rear annular positioning groove for clamping the front dust cover 13 and the rear dust cover 12, so as to serve as the preset position for the installation of the two, and the rear end of the input push rod 11 is connected to the pedal through a connector 9.

[0061] Specifically, the housing 3 is injection molded from PA66-GF35 material, the front dust cover 13 and the rear dust cover 12 are both butterfly-shaped and made of POM material, the bearing seat 24 is a stamped part and has an interference fit with the bearing 25, the guide rod 21 is a machined part, the sleeve 5 is made of EPDM material, and the fixing ring 4 is overmolded. It is worth pointing out that the multi-stage elastic component 2 is the core part of the pedal simulation mechanism. It is an internal force component. Since there is no mechanical connection with the external decoupler master cylinder output under normal conditions, it must meet both the driver's pedal feel and the NVH requirements, so there are high requirements for the material, dimensional accuracy, performance and appearance quality of the parts.

[0062] Embodiment 2:

[0063] Based on the pedal simulation mechanism in the first embodiment, its assembly process includes a process of assembling the multi-stage elastic component 2, a process of assembling the input push rod component 1, and a process of assembling the multi-stage elastic component 2 and the input push rod component 1 into one body; wherein,

[0064] The process of assembling the multi-stage elastic component 2 includes:

[0065] Step a, press the inner hole of the bearing 25 into the bearing seat 24 with interference fit, and ensure that the outer ring of the bearing 25 can rotate freely;

[0066] Step b, the guide rod 21 passes through the bearing seat 24 from front to back, and the third elastic member 23 and the second elastic member 26 are sequentially mounted on the outer periphery of the guide rod 21;

[0067] Step c, using a fixture to assemble the spring support seat 22 to the rear end of the guide rod 21 and weld it to fix;

[0068] Step d: testing the forces of the second elastic member 26 and the third elastic member 23 .

[0069] The process of assembling the input push rod assembly 1 includes:

[0070] Step e, insert the rear dust cover 12 onto the outer periphery of the input push rod 11 from the back to the front, and push it to the limit position in the rear annular positioning groove;

[0071] Step f, the front end of the input push rod 11 passes through the mounting through hole of the housing 3 from the back to the front until the rear end of the housing 3 abuts against the rear dust cover 12;

[0072] Step g, insert the front dust cover 13 from front to back into the outer periphery of the input push rod 11, and push it to the limit position in the front annular positioning groove, at this time, the front dust cover 13 and the rear dust cover 12 are closely attached to and clamp the housing 3;

[0073] Step h, fitting the first elastic member 14 onto the outer periphery of the input push rod 11 from front to back, and the rear end of the first elastic member 14 abuts against the front dust cover 13;

[0074] The process of assembling the multi-stage elastic component 2 and the input push rod component 1 into one body includes:

[0075] Step i, inserting at least a portion of the fixing ring 4 into the sheath 5 from front to back and fastening and fixing them to each other;

[0076] Step j, the input push rod assembly 1 is installed into the sheath 5 from front to back, and the housing 3 slides backward along the guide groove on the inner wall of the fixing ring 4, and the rear end of the input push rod 11 passes through the through hole of the sheath 5;

[0077] Step k, at least a portion of the multi-stage elastic component 2 is installed into the housing 3 from front to back, and the spring support seat 22 and the front dust cover 13 abut against the first elastic component 14, and the front end of the input push rod 11 extends into the axial hole at the rear end of the guide rod 21.

[0078] Based on the above technical solution, the multi-stage elastic component 2, the input push rod component 1 and the overall pedal simulation mechanism can be easily assembled, and the assembly is convenient and the structure is stable.

[0079] In addition, the pedal simulation mechanism is mainly used in the decoupling mechanism. The linkage mechanism 7, driving mechanism, displacement sensing mechanism 6 and power-assisting mechanism of the decoupling structure are all installed at the front of the pedal simulation mechanism, and the linkage mechanism 7 is used to press and connect the above-mentioned fixing ring 4 and the bearing seat 24, and the detection part 62 of the displacement sensing mechanism 6 is fixed on the fixing ring 4 and the sensing part 61 is fixed on the outer shell 3, so that it can move relatively to realize the displacement detection function, and then transmit the signal to the driving mechanism, and the driving mechanism transmits the action to the power-assisting mechanism through the linkage mechanism 7 and the output push rod 8 to achieve the purpose of power-assisting braking.

[0080] Embodiment 3,

[0081] Based on the pedal simulation mechanism in the first embodiment, combined with Figures 7 to 12 As shown in , the rear end of the input push rod 11 in the pedal simulation mechanism is connected to an external pedal, and the pedal continuously provides thrust to the input push rod 11 and pushes the input push rod 11 to move forward, and its operation method includes:

[0082] The first stage: the input push rod 11 moves forward due to the pedal thrust, and drives the housing 3, the front dust cover 13, and the rear dust cover 12 to move forward. The first elastic member 14 is compressed and provides a backward feedback force to the input push rod 11 and the pedal through the front dust cover 13;

[0083] The second stage: the input push rod 11 continues to move forward due to the pedal thrust, the guide rod 21, the spring support seat 22, and the third elastic member 23 of the multi-stage elastic assembly 2 move forward under the action of the first elastic member 14, and the bearing seat 24 is in the initial position due to the abutment with the linkage mechanism 7 installed at the rear of the pedal simulation mechanism, the second elastic member 26 is compressed and further provides a backward feedback force to the input push rod 11 and the pedal through the spring support seat 22, the first elastic member 14, and the front dust cover 13, and in the second stage, the first elastic member 14 is in a state of continuous action;

[0084] The third stage: the input push rod 11 moves further forward due to the pedal thrust, and the guide rod 21, spring support seat 22, and third elastic member 23 of the multi-stage elastic assembly 2 move forward under the action of the first elastic member 14. Since the bearing seat 24 is in the initial position, it abuts against the front end surface of the third elastic member 23, and the third elastic member 23 is clamped by the spring support seat 22 and the bearing seat 24. The third elastic member 23 is compressed and further provides backward feedback force to the input push rod 11 and the pedal through the spring support seat 22, the first elastic member 14, and the front dust cover 13. In the third stage, the first elastic member 14 and the second elastic member 26 are both in a state of continuous action.

[0085] Based on the above technical solution, when the pedal continuously applies force or suddenly applies force to the input push rod 11, the first elastic component 14, the second elastic component 26, and the third elastic component 23 can provide feedback force according to the force, and provide the driver with a function of simulating the pedal braking feeling, and when the pedal is not under force, the three elastic components work together to realize the reset function.

[0086] In a preferred embodiment, a sensing part 61 of a displacement sensing mechanism is installed on the outer periphery of the front end of the housing 3 of the pedal simulation mechanism, and a detection part 62 of the displacement sensing mechanism is installed on the fixing ring 4 of the pedal simulation mechanism, and in the first stage, the second stage and the third stage, the housing 3 moves forward with the sensing part 61 along with the input push rod 11, and the sensing part 61 moves horizontally relative to the detection part 62. Based on this, the detection part 62 performs a detection action according to the displacement difference generated by the relative movement of the sensing part 61, and transmits information to the circuit board of the displacement sensing mechanism, and then transmits a signal to the driving mechanism of the decoupling mechanism, and the driving mechanism performs an action, and drives the power assist mechanism to perform a braking action through the action linkage of the linkage component.

[0087] It is worth pointing out that, combined with Figure 7 , Figure 8 as well as Fig. 9 As shown in the figure, the driving mechanism used in this case adopts a conventional motor drive in the field, and the power-assisting mechanism adopts a conventional hydraulic power-assisting structure, which is a well-known technology in the field and is not the main invention of this case, so it is omitted in the figure. At the same time, the linkage mechanism adopts a structure of a gear set plus a hollow screw 71, and at least a part of the front end of the guide rod 21 extends into the hollow screw 71. The gear set drives the hollow screw 71 and the gear set outside the motor shaft of the driving mechanism, so that the action can be transmitted smoothly. The screw 71 can move back and forth under the action of the gear set, converting the circumferential action into a linear action, thereby realizing the entire action logic of the decoupling mechanism.

[0088] The above description is only a preferred embodiment of the present invention, which is only illustrative and not restrictive of the present invention. Those skilled in the art understand that many changes, modifications, and even equivalences may be made to the present invention within the spirit and scope defined by the claims of the present invention, but all of them will fall within the scope of protection of the present invention.

Claims

1. A pedal simulation mechanism, characterized in that: The invention comprises a multi-stage elastic component (2) and an input push rod component (1) arranged front and back relative to each other, wherein the multi-stage elastic component (2) comprises a guide rod (21), the outer circumference of which is sequentially provided with a spring support seat (22), a third elastic component (23) and a bearing seat (24) from back to front, and a second elastic component (26) is installed between the spring support seat (22) and the bearing seat (24), and at least one of the spring support seat (22) and the bearing seat (24) can move forward and backward relative to the guide rod (21); the input push rod component (1) comprises an input push rod (11), a first elastic component (14) which is provided on the outer circumference of the input push rod (11), and the rear end of the input push rod (11) is provided with a spring support seat (22), a third elastic component (23) and a bearing seat (24) which are installed on the outer circumference of the input push rod (11), and the rear end of the input push rod (11) is provided with a spring support seat (22), a third elastic component (23) and a bearing seat (24) which are provided on the outer circumference of the input push rod (11), and the second elastic component (26) is installed between the spring support seat (22) and the bearing seat (24), and at least one of the spring support seat (22) and the bearing seat (24) can move forward and backward relative to the guide rod (21); The front end of the first elastic member (14) is connected to an external pedal and is arranged opposite to the rear end of the guide rod (21). The two ends of the first elastic member (14) act on the multi-stage elastic component (2) and the input push rod (11) respectively to form a preload between the input push rod (11) and the multi-stage elastic member. The outer periphery of the input push rod (11) is also covered with a front dust cover (13) and a rear dust cover (12) arranged adjacently. The two ends of the first elastic member (14) are respectively against the front dust cover (13) and a spring support seat (22). The spring support seat (22) is fixed to the outer periphery of the guide rod (21). The bearing seat (24) is movably covered on the outer periphery of the guide rod (21) and can move forward and backward along the outer periphery of the guide rod (21).

2. The pedal simulation mechanism according to claim 1, characterized in that: The invention also comprises a shell (3), wherein the shell (3) is generally in the shape of a cylinder with an open front end, and the interior of the shell is formed with a receiving cavity for receiving at least a portion of the input push rod assembly (1) and at least a portion of the multi-stage elastic assembly (2), and a mounting hole for passing the input push rod (11) is provided on the rear end surface of the shell (3), and the front dust cover (13) and the rear dust cover (12) are respectively tightly attached to the front and rear sides of the mounting hole and clamp the shell (3) to allow the shell (3) to move synchronously with the input push rod (11).

3. The pedal simulation mechanism according to claim 1 or 2, characterized in that: The rear end of the guide rod (21) is provided with an axial hole, and at least a portion of the front end of the input push rod (11) extends into the interior of the axial hole.

4. The pedal simulation mechanism according to claim 1, characterized in that: The first elastic component (14) is a conical coil spring, the second elastic component (26) is a cylindrical coil spring, and the third elastic component (23) is a shock-absorbing spring block.

5. The pedal simulation mechanism according to claim 4, characterized in that: There is a gap between the third elastic member (23) and the bearing seat (24).

6. The pedal simulation mechanism according to claim 1, characterized in that: The rear end surface of the bearing seat (24) is also recessed forward to form an annular mounting groove, and a bearing (25) is embedded in the annular mounting groove. The inner ring of the bearing (25) is fitted with the inner edge of the annular mounting groove, and the outer ring of the bearing (25) can rotate freely.

7. The pedal simulation mechanism according to claim 2, characterized in that: It also includes a sleeve (5) and a fixing ring (4), wherein the fixing ring (4) is mounted on the outer periphery of the outer shell (3) and allows the outer shell (3) to move forward and backward relative to the fixing ring (4); the sleeve (5) is a cylindrical structure with an open front end and is mounted on the outer periphery of the fixing ring (4); the front end of the sleeve (5) has a through hole for passing the input push rod (11), and the outer shell (3) is accommodated in the sleeve (5).

8. An assembly method of a pedal simulation mechanism according to any one of claims 1 to 7, characterized in that: The method includes a process of assembling a multi-stage elastic component, a process of assembling an input push rod component, and a process of assembling the multi-stage elastic component and the input push rod component into one body; The process of assembling a multi-stage elastic component includes: Step a, press the inner hole of the bearing (25) into the bearing seat (24) with interference fit, and ensure that the outer ring of the bearing (25) can rotate freely; Step b, the guide rod (21) passes through the bearing seat (24) from front to back, and the third elastic member (23) and the second elastic member (26) are sequentially mounted on the outer periphery of the guide rod (21); Step c, using a fixture to assemble the spring support seat (22) to the rear end of the guide rod (21) and fix it by welding; Step d, testing the acting force of the second elastic member (26) and the third elastic member (23); The process of assembling the input push rod assembly includes: Step e, inserting the rear dust cover (12) from the back to the front onto the outer periphery of the input push rod (11), and pushing it to a limit position in the rear annular positioning groove; Step f, the front end of the input push rod (11) passes through the mounting through hole of the housing (3) from back to front until the rear end of the housing (3) abuts against the rear dust cover (12); Step g, inserting the front dust cover (13) from front to back into the outer periphery of the input push rod (11), and pushing it to the limit position in the front annular positioning groove, at which time, the front dust cover (13) and the rear dust cover (12) are closely attached to and clamp the housing (3); Step h, fitting the first elastic member (14) onto the outer periphery of the input push rod (11) from front to back, with the rear end of the first elastic member (14) abutting against the front dust cover (13); The process of assembling the multi-stage elastic component and the input push rod component into one body includes: Step i, inserting at least a portion of the fixing ring (4) into the sleeve (5) from front to back and fastening them together; Step j, inserting the input push rod assembly (1) into the sleeve (5) from front to back, and the housing (3) slides backward along the guide groove on the inner wall of the fixing ring (4), and the rear end of the input push rod (11) passes through the through hole of the sleeve (5); Step k, at least a portion of the multi-stage elastic component (2) is installed into the housing (3) from front to back, and the spring support seat (22) and the front dust cover (13) are jointly abutted against the first elastic member (14), and the front end of the input push rod (11) extends into the axial hole at the rear end of the guide rod (21).

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