Pedal feeling simulator of novel push rod limiting structure

Abstract

The utility model discloses a novel pedal feeling simulator with a push rod limiting structure, which belongs to the technical field of automobile braking and comprises a shell, a push rod, a cylinder body, a piston and a hydraulic interface. The first belleville spring set and the second belleville spring set gradually get close to the flattening state under extrusion of the push rod till the limiting gasket is attached to the inner conical surface of the second belleville spring set, and when the first belleville spring set and the second belleville spring set are both in the state that deformation cannot continue, the position of the push rod is in the maximum stroke of self movement, and the position of the push rod is in the maximum stroke of self movement. When the maximum stroke of the push rod needs to be changed, the moving distance of the push rod is controlled by additionally installing or reducing the number of the limiting gaskets in the shell and adjusting the thickness of the limiting gaskets, and therefore the maximum stroke of the push rod can be controlled. The use effect of the pedal feeling simulator of the novel push rod limiting structure is more efficient and stable.

Description

Technical Field

[0001] The utility model belongs to the technical field of automotive braking, and particularly relates to a pedal feel simulator with a novel push rod limiting structure. Background Technique

[0002] Electromechanical braking is a new braking technology that can meet the requirements of higher-level automotive autonomous driving. It combines electronic control technology and mechanical braking systems, providing a more efficient and intelligent braking solution for vehicles. The system realizes precise control of the vehicle braking system through an electronic control unit. In this braking system, the braking pedal feel obtained when the driver steps on the braking pedal is usually realized through a pedal feel simulation device. Currently, the industry usually uses elastic elements to simulate the pedal feel.

[0003] Chinese invention patent CN109080599A discloses a pedal travel simulator for a hydraulic external force type vehicle braking system with a bowl-shaped cylinder head. A piston spring is accommodated in the cylinder head, and the piston spring is held in the cylinder head by a hole plate serving as a stop for the piston of the pedal travel simulator. The present invention proposes to provide a recess in the outer edge of the hole plate, through which the piston can squeeze the braking liquid from the cylinder of the pedal travel simulator into a return member through a surrounding groove on its rear side;

[0004] The above design provides a resilient return for the movement of the piston through the use of a piston spring, realizing the simulation of the pedal feel when the user uses the pedal. However, there are certain problems in the use of the above design. Specifically, when the device is in use, a hole plate needs to be installed at the top opening of the cylinder head to limit the movement stroke of the piston. When installing the hole plate, an additional annular step for placing the hole plate needs to be opened at the top opening of the cylinder head. After the hole plate is assembled, the overall position is relatively fixed, and the movement stroke of the piston cannot be adjusted flexibly subsequently. Summary of the Utility Model

[0005] The purpose of this part is to outline some aspects of the embodiments of the present utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this part, as well as in the abstract of the specification and the title of the utility model of this application, to avoid obscuring the purpose of this part, the abstract of the specification, and the title of the utility model. However, such simplifications or omissions cannot be used to limit the scope of the present utility model.

[0006] To solve the problems raised in the above background technique, the present utility model adopts the following technical solutions.

[0007] A pedal feel simulator with a novel push rod limit structure, comprising a housing, a push rod, a cylinder block, a piston and a hydraulic interface. The bottom end opening of the cylinder block is fixedly installed with the housing. The push rod is slidably installed inside the housing. A sliding groove is formed inside the cylinder block. The piston is slidably installed in the sliding groove. A hydraulic interface is formed inside the cylinder block, and the hydraulic interface is communicated with the sliding groove. A return spring assembly for providing a return spring force for the movement of the push rod is arranged inside the housing. One or more limit gaskets are arranged inside the return spring assembly, and the maximum movement stroke of the push rod is limited by the limit gaskets.

[0008] As a preferred technical solution of the present invention, the return spring assembly includes a fitting gasket, a first set of disc springs, a second set of disc springs and a limit gasket. The fitting gasket is slidably installed inside the housing. The upper surface of the fitting gasket fits against the bottom end of the push rod. The first set of disc springs is arranged at the bottom end of the fitting gasket. The first set of disc springs is composed of multiple sets of flattenable disc springs. The second set of disc springs is arranged inside the housing. The second set of disc springs is composed of multiple sets of non-flattenable disc springs. The limit gasket is arranged between the second set of disc springs. After the second set of disc springs is squeezed by the upper push rod, the inner conical surface of the non-flattenable disc spring in the second set of disc springs contacts the protruding part of the limit gasket.

[0009] As a preferred technical solution of the present invention, the limit gasket is a first gasket. The first gasket is composed of a disc and a protruding ring. The disc is arranged between the second set of disc springs. The protruding rings are fixedly installed on the upper and lower surfaces of the disc. The protruding rings are in extrusion contact with the inner conical surface of the second set of disc springs, and the protruding rings are in the shape of a closed ring.

[0010] As a preferred technical solution of the present invention, the limit gasket is a second gasket. The second gasket is composed of a chassis and convex points. The chassis is arranged between the second set of disc springs. The convex points are equidistantly and fixedly installed on the upper and lower surfaces of the disc, and the convex points contact the inner conical surface of the second set of disc springs.

[0011] As a preferred technical solution of the present invention, the pedal feel simulator with the novel push rod limit structure further includes a circulation groove and a return hole. A circulation groove for assisting the liquid inside the housing to circulate is formed on the inner wall of the cylinder block. A return hole for inputting and outputting liquid is formed inside the cylinder block, and the circulation groove is communicated with the return hole.

[0012] As a preferred technical solution of the present invention, the push rod includes a push plate, a delivery hole and a mating rod. The push plate is slidably installed on the inner wall of the housing. The bottom end of the push plate contacts the upper surface of the fitting gasket. Multiple sets of delivery holes are formed inside the push plate, and the delivery holes penetrate through the push plate itself. The mating rod is fixedly installed on the upper surface of the push plate, and the mating rod contacts the bottom end of the piston.

[0013] As a preferred technical solution of the present utility model, the housing includes a bottom cylinder and a spring piece. The bottom cylinder is fixedly installed at the opening at the bottom end of the cylinder block. An annular groove is provided at the opening at the top end of the bottom cylinder. The spring piece is arranged in the annular groove, and the spring piece is at least one of a limit ring or a protective retaining ring.

[0014] As a preferred technical solution of the present utility model, the housing further includes an installation component, and the installation component is at least one of a threaded block or a threaded end. The installation component is arranged outside the bottom cylinder.

[0015] As a preferred technical solution of the present utility model, the piston includes a moving block and a sealing gasket. The moving block is slidably installed in a sliding groove provided inside the cylinder block, and the sealing gasket is sleeved outside the moving block.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] (1) In the present utility model, by providing a resilience component, as the moving distance of the push rod changes, the first set of disc springs gradually becomes a flattened state. Once the first set of disc springs is flattened, the second set of disc springs will also gradually approach the flattened state under the extrusion of the push rod. At this time, the limit gasket fits with the inner conical surface of the second set of disc springs to control the maximum deformation degree of the second set of disc springs. When both the first set of disc springs and the second set of disc springs are in a state where they cannot be deformed further, the position of the push rod is at the maximum stroke of its own movement, realizing the control of the maximum stroke of the push rod. When it is necessary to change the maximum stroke of the push rod, by adding or reducing the number of limit gaskets inside the housing and adjusting the thickness of the limit gasket itself, the moving distance of the push rod is controlled, making the use effect of the pedal feel simulator with the new push rod limit structure more efficient and stable.

[0018] (2) In the present utility model, by providing the housing and the spring piece, the upper surface of the push rod can be extruded and limited, controlling the overall moving range of the push rod. And during use, the spring piece can limit the angle and position of the push rod, ensuring the stability of each set of disc springs inside the housing during use, preventing the disc springs from popping out of the housing, and ensuring the stability of the equipment during use. Description of the Drawings

[0019] Figure 1 It is a plan view of the overall structure of the present utility model.

[0020] Figure 2 It is a plan view of the internal structure of the housing of the present utility model.

[0021] Figure 3 It is a plan view of the structure after the second set of disc springs and the limit gasket of the present utility model are stacked.

[0022] Figure 4This is a schematic structural diagram of the first gasket in the present utility model.

[0023] Figure 5 This is a schematic structural diagram of the second gasket in the present utility model.

[0024] Figure 6 This is a schematic structural diagram when the push rod is connected to the housing in the present utility model.

[0025] Figure 7 This is a schematic structural diagram of the push rod in the present utility model.

[0026] Figure 8 This is a schematic structural diagram of one of the elastic pieces and the bottom cylinder after assembly in the present utility model.

[0027] Figure 9 This is a schematic structural diagram of another elastic piece and the bottom cylinder after assembly in the present utility model.

[0028] Figure 10 This is a schematic structural diagram of the first connection method between the housing and the cylinder block in the present utility model.

[0029] Figure 11 This is a schematic structural diagram of the second connection method between the housing and the cylinder block in the present utility model.

[0030] Figure 12 This is a schematic diagram of the maximum stroke of the push rod movement in the present utility model.

[0031] The corresponding relationship between the reference numerals and the component names in the figure is as follows:

[0032] 1. Housing; 11. Bottom cylinder; 12. Elastic piece; 13. Threaded block; 14. Threaded end; 2. Push rod; 21. Push plate; 22. Delivery hole; 23. Fitting rod; 3. Cylinder block; 4. Piston; 41. Moving block; 42. Sealing gasket; 5. Hydraulic interface; 6. Rebound assembly; 61. Fitting gasket; 62. First set of disc springs; 63. Second set of disc springs; 64. Limit gasket; 641. First gasket; 642. Second gasket; 7. Circulation groove; 8. Return hole. Detailed implementation manners

[0033] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the following will describe the detailed implementation manners of the present utility model with reference to the accompanying drawings of the specification.

[0034] In the following description, many specific details are set forth to fully understand the present utility model. However, the present utility model can also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0035] Secondly, the so-called "one embodiment" or "embodiment" herein refers to specific features, structures or characteristics that may be included in at least one implementation manner of the present utility model. The "in one embodiment" appearing in different places in this specification does not all refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments. The present utility model provides the following embodiments.

[0036] By Figure 1 , Figure 2 and Figure 3 As shown in the figure, it is a schematic structural diagram of a pedal feel simulator with a new push rod limit structure in this embodiment, including a housing 1, a push rod 2, a cylinder block 3, a piston 4 and a hydraulic interface 5. The housing 1 is fixedly installed at the bottom opening of the cylinder block 3. The push rod 2 is slidably installed inside the housing 1. A sliding groove is formed inside the cylinder block 3. The piston 4 is slidably installed in the sliding groove. A hydraulic interface 5 is formed inside the cylinder block 3. The hydraulic interface 5 is communicated with the sliding groove. A return spring assembly 6 for providing a return force for the movement of the push rod 2 is arranged inside the housing 1.

[0037] In use, through the cooperation of the external connection holes of the cylinder block 3, when the pedal moves under the push of the user, the liquid inside the cylinder block 3 will pass through the hydraulic interface 5 and enter the sliding groove inside the cylinder block 3. At this time, due to the connection between the housing 1 and the cylinder block 3, the overall internal cavity of the housing 1 and the cylinder block 3 is in a sealed state. At this time, when the liquid enters the sliding groove inside the cylinder block 3, the piston 4 will move along the length direction of the inner wall of the sliding groove. The push rod 2 is squeezed and pushed by the piston 4, and the push rod 2 pushes the internal structure of the return spring assembly 6 inside the housing 1 to contract. By using the elastic force generated by the internal structure of the return spring assembly 6, the simulation of the pedal feel is realized.

[0038] As shown in the attached Figure 2 and Figure 3 figure, it is a schematic structural diagram of the return spring assembly 6 in this embodiment. The return spring assembly 6 includes a fitting gasket 61, a first set of disc springs 62, a second set of disc springs 63 and a limit gasket 64. The fitting gasket 61 is slidably installed inside the housing 1. The upper surface of the fitting gasket 61 is attached to the bottom end of the push rod 2. The first set of disc springs 62 is arranged at the bottom end of the fitting gasket 61. The first set of disc springs 62 is composed of multiple sets of flattenable disc springs. The second set of disc springs 63 is arranged inside the housing 1. The second set of disc springs 63 is composed of multiple sets of non-flattenable disc springs. The limit gasket 64 is arranged between the second set of disc springs 63. After the second set of disc springs 63 is squeezed by the upper push rod 2, the inner conical surface of the non-flattenable disc spring in the second set of disc springs 63 contacts the protruding part of the limit gasket 64.

[0039] During use, by sliding the upper piston 4, the push rod 2 pushes the fitting gasket 61 to move into the interior of the housing 1. At this time, under the extrusion of the push rod 2, multiple groups of first disc spring groups 62 form a shape that gradually develops from a conical shape towards a flattened direction. The second disc spring group 63 is installed at the bottom end of the first disc spring group 62. When the first disc spring group 62 is flattened, the extrusion force received will be transmitted into the second disc spring group 63, causing the second disc spring group 63 to deform itself until the inner conical surface of the second disc spring group 63 fits against the surface of the limit gasket 64. At this time, all components within the spring return assembly 6 are in a fully compacted state, and the push rod 2 cannot push the fitting gasket 61 to move, reaching the maximum moving stroke of the push rod 2. After that, under the action of the elastic force generated by the extrusion of the first disc spring group 62 and the second disc spring group 63, the push rod 2 pushes the piston 4 to move towards the top, realizing the reset of the push rod 2 and the piston 4. And during use, through the thickness of the limit gasket 64 itself and the extrusion of the inner conical surface of the second disc spring group 63, the maximum deformation degree of the second disc spring group 63 can be limited, thereby controlling the maximum moving distance of the push rod 2. And according to different requirements for the moving distance of the push rod 2, two methods can be used to control the maximum moving distance of the push rod 2. One is to adjust the number of limit gaskets 64 arranged within the second disc spring group 63, and the other is to adjust the thickness of the entire component of the limit gasket 64. Both adjustment methods can make the adjustment of the overall moving distance of the push rod 2 more flexible. During use, the interior of the housing 1 is filled with a liquid, and this kind of liquid will lubricate the first disc spring group 62 and the second disc spring group 63, extending the service life of the components within the spring return assembly 6.

[0040] As shown in the attached Figure 4 figure, which is a schematic structural diagram of the first gasket 641 in this embodiment. The limit gasket 64 is the first gasket 641. The first gasket 641 is composed of a disc and a raised ring. The disc is arranged between the second disc spring groups 63. The raised rings are fixedly installed on the upper and lower surfaces of the disc. The raised rings are in extrusion contact with the inner conical surface of the second disc spring group 63, and the raised rings are in the shape of a closed ring.

[0041] When the limit gasket 64 is the first gasket 641, when the second disc spring group 63 is squeezed, the surface of the disc fits against the edge of the second disc spring group 63, providing support for the second disc spring group 63. As the extrusion force continues to increase, the entire second disc spring group 63 deforms. The inner conical surface of the second disc spring group 63 fits against the raised ring. Using the thickness of the raised ring itself, the maximum deformation angle of the second disc spring group 63 is limited, forcing the second disc spring group 63 to stop deforming, thus limiting the maximum stroke of the push rod 2. And the raised ring is in the shape of a closed ring, with a hole groove left in the middle, facilitating the telescoping and sliding of the middle part of the push rod 2.

[0042] As shown in the attachedFigure 5 As shown, it is a schematic structural diagram of the second gasket 642 in this embodiment. The limit gasket 64 is the second gasket 642. The second gasket 642 is composed of a chassis and bumps. The chassis is arranged between the second disc spring groups 63. The bumps are fixedly installed at equal distances on the upper and lower surfaces of the disc. The bumps are in contact with the inner conical surface of the second disc spring group 63.

[0043] When the limit gasket 64 is the second gasket 642, the second disc spring group 63 is squeezed, and the second disc spring group 63 as a whole deforms, causing the inner conical surface of the second disc spring group 63 to approach the side of the bumps until the bumps fit with the inner conical surface of the second disc spring group 63. The bumps can control the maximum deformation angle of the second disc spring group 63.

[0044] When the limit gasket 64 is in use, the overall height of the raised ring or bumps is related to the deformation angle of the second disc spring group 63. The higher the height of the raised ring or bumps, the smaller the deformation angle of the second disc spring group 63, and the smaller the overall movement distance of the push rod 2. Subsequently, the maximum movement stroke of the push rod 2 is controlled by adjusting the height of the raised ring or bumps.

[0045] By attachment Figure 1 As shown, the pedal feel simulator with the new push rod limit structure further includes a circulation groove 7 and a return hole 8. A circulation groove 7 for assisting the liquid inside the auxiliary housing 1 to circulate is provided on the inner wall of the cylinder block 3. A return hole 8 for inputting and outputting liquid is provided inside the cylinder block 3. The circulation groove 7 is communicated with the return hole 8. During use, when the piston 4 moves towards the inner wall of the housing 1, the liquid jointly contained in the cavities of the housing 1 and the cylinder block 3 is pushed by the piston 4 to pass through the circulation groove 7 and enter the inside of the return hole 8. Then, with the cooperation of the return hole 8 and the oil pot connected to the return hole 8, the liquid squeezed and pushed by the piston 4 is collected. When the piston 4 is reset, the piston 4 moves towards the side close to the cylinder block 3. At this time, the liquid in the return hole 8 and the oil pot connected to the return hole 8 will be driven by the piston 4, and the previously collected liquid in the oil pot will re-penetrate through the return hole 8 and the circulation groove 7 and enter the cavities inside the housing 1 and the cylinder block 3.

[0046] By attachment Figure 6 and Figure 7As shown, it is a schematic structural diagram of the push rod 2 in this embodiment. The push rod 2 includes a push plate 21, a conveying hole 22, and a mating rod 23. The push plate 21 is slidably installed on the inner wall of the housing 1. The bottom end of the push plate 21 contacts the upper surface of the fitting gasket 61. A plurality of groups of conveying holes 22 are formed inside the push plate 21, and the conveying holes 22 penetrate through the push plate 21 itself. The mating rod 23 is fixedly installed on the upper surface of the push plate 21, and the mating rod 23 contacts the bottom end of the piston 4. During use, through the use of the mating rod 23, when the piston 4 moves, the bottom end of the piston 4 squeezes and contacts the top end of the mating rod 23, pushing the mating rod 23 and the push plate 21 to move synchronously. The opening of the conveying holes 22 facilitates the liquid inside the housing 1 to flow through the conveying holes 22, and in conjunction with the lifting movement of the piston 4, to control the total amount of liquid inside the housing 1.

[0047] As shown by the attached Figure 8 and Figure 9 As shown, it is a schematic structural diagram of the elastic piece 12 in this embodiment. The housing 1 includes a bottom cylinder 11 and an elastic piece 12. The bottom cylinder 11 is fixedly installed at the opening at the bottom end of the cylinder block 3. An annular groove is formed at the opening at the top end of the bottom cylinder 11, and the elastic piece 12 is arranged in the annular groove. The elastic piece 12 is at least one of a limiting ring or a protective retaining ring. During use, through the installation of the elastic piece 12, the bottom end of the elastic piece 12 contacts the upper surface of the push plate 21, which can prevent the rebound assembly 6 inside the housing 1 from popping out of the housing 1, realizing the limitation of the maximum distance of the rebound assembly 6 when the rebound assembly 6 is not squeezed. Among them, the elastic piece 12 can adopt two structures when in use. One is a limiting ring with multiple groups of support pieces equidistantly installed on the side, and the other is a protective retaining ring with a hole groove formed inside. Both are installed at the opening at the top end of the bottom cylinder 11 when in use, and both can limit the position of the rebound assembly 6 inside the bottom cylinder 11.

[0048] As shown by the attached Figure 10 and Figure 11 As shown, it is a schematic structural diagram of the installation component in this embodiment. The housing 1 further includes an installation component, and the installation component is at least one of a threaded block 13 or a threaded end 14. The installation component is arranged outside the bottom cylinder 11. During use, when installing the bottom cylinder 11 with the threaded block 13, the bottom cylinder 11 is slidably installed at the opening at the bottom end of the cylinder block 3, and then the threaded block 13 is sleeved outside the bottom cylinder 11. Rotate the threaded block 13, and utilize the threads on the outside of the threaded block 13 to cooperate with the thread groove on the inner wall of the opening at the bottom end of the cylinder block 3 to fix the position of the bottom cylinder 11. When using the threaded end 14, the bottom cylinder 11 is fitted to the opening at the bottom end of the cylinder block 3, and then the bottom cylinder 11 is rotated, and utilize the threads on the outside of the threaded end 14 to complete the installation of the bottom cylinder 11, so that the inner cavity of the bottom cylinder 11 is communicated with the sliding groove inside the cylinder block 3, and the internal cavities of the two are in a sealed state after connection.

[0049] As shown by the attached Figure 10As shown in the figure, it is a schematic structural diagram of the piston 4 in this embodiment. The piston 4 includes a moving block 41 and a sealing gasket 42. The moving block 41 is slidably installed in a sliding groove opened inside the cylinder block 3. The sealing gasket 42 is sleeved outside the moving block 41. During use, when the liquid inside the cylinder block 3 enters the sliding groove inside the cylinder block 3 through the hydraulic interface 5, the moving block 41 slides in the direction close to the housing 1 under the push of the liquid. At this time, the sealing gasket 42 moves synchronously with the moving block 41. The edge of the sealing gasket 42 contacts the inner wall of the sliding groove, which can prevent the liquid at the top of the piston 4 from passing through the moving block 41 and entering the inner cavity of the housing 1, realizing the sealing of the overall structure.

[0050] The above content further elaborates on the present utility model in combination with specific implementation manners. It cannot be determined that the specific implementation of the present utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model pertains, without departing from the concept of the present utility model, several simple deductions or substitutions can still be made, which should all be regarded as falling within the protection scope determined by the claims submitted for the present utility model.

Claims

1. A pedal feel simulator with a novel push rod limiting structure, comprising a housing (1), a push rod (2), a cylinder (3), a piston (4) and a hydraulic interface (5), wherein the housing (1) is fixedly mounted at the bottom opening of the cylinder (3), the push rod (2) is slidably mounted inside the housing (1), a sliding groove is provided inside the cylinder (3), the piston (4) is slidably mounted in the sliding groove, a hydraulic interface (5) is provided inside the cylinder (3), and the hydraulic interface (5) is connected to the sliding groove, and is characterized in that: The housing (1) is provided with a rebound component (6) for providing a rebound force for the movement of the push rod (2), and the rebound component (6) is provided with one or more limit washers (64), and the limit washers (64) are used to limit the maximum movement stroke of the push rod (2).

2. The pedal feel simulator of the novel push rod limiting structure according to claim 1 is characterized in that: The rebound assembly (6) comprises a fitting gasket (61), a first disc spring group (62), a second disc spring group (63) and a limiting gasket (64); the fitting gasket (61) is slidably mounted inside the housing (1); the upper surface of the fitting gasket (61) fits against the bottom end of the push rod (2); the first disc spring group (62) is arranged at the bottom end of the fitting gasket (61); the first disc spring group (62) is composed of a plurality of groups of disc springs that can be flattened; the second disc spring group (63) is arranged inside the housing (1); the second disc spring group (63) is composed of a plurality of groups of disc springs that cannot be flattened; the limiting gasket (64) is arranged between the second disc spring groups (63); after the second disc spring group (63) is squeezed by the upper push rod (2), the inner conical surface of the disc spring that cannot be flattened in the second disc spring group (63) contacts the raised portion of the limiting gasket (64).

3. The pedal feel simulator of the novel push rod limiting structure according to claim 2 is characterized in that: The limiting gasket (64) is a first gasket (641), which is composed of a disk and a raised ring. The disk is arranged between the second disc spring group (63), and the raised ring is fixedly mounted on the upper and lower surfaces of the disk. The raised ring is in compression contact with the inner conical surface of the second disc spring group (63), and the raised ring is in the shape of a closed ring.

4. The pedal feel simulator of the novel push rod limiting structure according to claim 2 is characterized in that: The limiting gasket (64) is a second gasket (642), the second gasket (642) is composed of a chassis and a convex point, the chassis is arranged between the second disc spring group (63), the convex point is fixedly installed on the upper and lower surfaces of the disc at equal distances, and the convex point is in contact with the inner conical surface of the second disc spring group (63).

5. The pedal feel simulator of the novel push rod limiting structure according to claim 1 is characterized in that: The pedal feel simulator of the novel push rod limiting structure also includes a circulation groove (7) and a reflux hole (8); the inner wall of the cylinder body (3) is provided with a circulation groove (7) for assisting the circulation of liquid inside the shell (1); the cylinder body (3) is provided with a reflux hole (8) for inputting and outputting liquid; the circulation groove (7) is communicated with the reflux hole (8).

6. The pedal feel simulator of the novel push rod limiting structure according to claim 2 is characterized in that: The push rod (2) comprises a push plate (21), a delivery hole (22) and a matching rod (23); the push plate (21) is slidably mounted on the inner wall of the housing (1); the bottom end of the push plate (21) contacts the upper surface of the fitting gasket (61); a plurality of groups of delivery holes (22) are provided inside the push plate (21); the delivery holes (22) penetrate the push plate (21) itself; the matching rod (23) is fixedly mounted on the upper surface of the push plate (21); and the matching rod (23) contacts the bottom end of the piston (4).

7. The pedal feel simulator of the novel push rod limiting structure according to claim 6 is characterized in that: The housing (1) comprises a bottom cylinder (11) and a spring piece (12); the bottom cylinder (11) is fixedly mounted at the bottom opening of the cylinder body (3); an annular groove is provided at the top opening of the bottom cylinder (11); the spring piece (12) is arranged in the annular groove; the spring piece (12) is at least one of a limiting ring and a protective retaining ring.

8. The pedal feel simulator of the novel push rod limiting structure according to claim 7 is characterized in that: The housing (1) further comprises a mounting assembly, which is at least one of a threaded block (13) and a threaded end (14), and the mounting assembly is arranged outside the base tube (11).

9. The pedal feel simulator of the novel push rod limiting structure according to claim 1 is characterized in that: The piston (4) comprises a moving block (41) and a sealing gasket (42); the moving block (41) is slidably mounted in a sliding groove provided inside the cylinder body (3); and the sealing gasket (42) is sleeved on the outside of the moving block (41).

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