CN220199266U - Pedal simulator and brake-by-wire system comprising same - Google Patents

Abstract

The utility model discloses a pedal simulator and a brake-by-wire system comprising the same, wherein the brake-by-wire system comprises an end cover, an elastic piece, a piston and a compression assembly; a mounting cavity is formed in the end cover, and an opening is formed at the top of the mounting cavity; the elastic piece is arranged in the mounting cavity; the interior of the piston is provided with a containing cavity, and the bottom of the containing cavity is provided with an opening; the compression assembly comprises a limiting piece, a first linear spring and a guide piece; the limiting piece is arranged in the mounting cavity and is positioned above the elastic piece, and a containing cavity penetrating through the upper surface and the lower surface of the limiting piece is formed in the limiting piece; the first end of the first linear spring is axially stopped in the accommodating cavity of the piston, and the second end of the first linear spring stretches into the mounting cavity and is axially limited by the limiting piece; one end of the guide piece is connected with the piston, the other end of the guide piece penetrates through the first linear spring to be inserted into the accommodating cavity of the limiting piece, and the guide piece can be driven by the piston to compress the elastic piece. The pedal simulator is used for solving the problems of poor stability of the linear spring and excessive unsmooth pedal feel curve.

Description

Pedal simulator and brake-by-wire system comprising same

Technical Field

The utility model relates to the technical field of pedal simulators, in particular to a pedal simulator and a brake-by-wire system comprising the same.

Background

The brake-by-wire system is an electronic control brake system and is divided into a mechanical brake-by-wire system and a hydraulic brake-by-wire system; the brake-by-wire system mainly comprises a valve block, a master cylinder module, a pedal simulator, an electric cylinder module, an electromagnetic valve, a sensor and an ECU, wherein the pedal simulator is an important component of the brake-by-wire system, and is communicated with the pedal simulator through the master cylinder to simulate the brake feel and is isolated from the electric cylinder brake module, so that complete decoupling is realized, the problem of poor feel caused by a braking process is avoided, and the adjustable pedal feel can be realized according to different client requirements. The main working principle of the pedal simulator is as follows: during conventional braking, a driver steps on a brake pedal, transmits force and travel to a push rod, a travel sensor detects the travel of the push rod, a pedal simulator valve is electrified to be opened, a primary piston is compressed, hydraulic pressure and travel are transmitted to the pedal simulator, a secondary piston is hardly compressed (a solenoid valve is electrified to close a main cylinder oil outlet), an electric cylinder receives travel and pressure signals, a motor is pushed to work, hydraulic pressure is applied to brake, and pedal force is simulated by a main cylinder spring and a pedal simulator spring due to a decoupling scheme.

The related art discloses a wire spring and disc spring combined pedal simulator which comprises a shell, wherein a boss is arranged at the bottom of the shell, an opening is arranged at the upper part of the shell, a retainer ring is arranged at the opening of the shell, the lower part of a piston is arranged in the shell and limited by the retainer ring, a cavity is arranged on the piston, a wire spring is arranged in the cavity, a groove is circumferentially arranged at the upper part of the piston, and an oil seal is arranged in the groove; the bearing disc is arranged in the shell and below the piston; the disc spring component is arranged in the shell; the limiting piece is arranged in the shell and is arranged in the disc spring component; because the piston sequentially passes through the wire spring and the bearing disc to compress the disc spring component in the compression process, the defects of poor stability of the wire spring and excessive unsmooth pedal feel curve exist; in addition, the design of adopting single linear spring still has the shortcoming of unable accurate regulation power value.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model aims to provide a pedal simulator and a brake-by-wire system comprising the pedal simulator, which are used for solving the problems of poor stability of a linear spring and excessive unsmooth pedal feel curve.

The utility model adopts the following technical scheme:

the first aspect of the present utility model provides a pedal simulator comprising an end cap, an elastic member, a piston, and a compression assembly;

a mounting cavity is formed in the end cover; an opening is formed at the top of the mounting cavity;

the elastic piece is arranged in the mounting cavity;

the inner part of the piston is provided with a containing cavity, and the bottom of the containing cavity is provided with an opening;

the compression assembly comprises a limiting piece, a first linear spring and a guide piece; the limiting piece is arranged in the mounting cavity and is positioned above the elastic piece, and a containing cavity penetrating through the upper surface and the lower surface of the limiting piece is formed in the limiting piece; the first end of the first linear spring is axially stopped in the accommodating cavity of the piston, and the second end of the first linear spring stretches into the mounting cavity and is axially limited by the limiting piece; one end of the guide piece is connected with the piston, the other end of the guide piece penetrates through the first linear spring to be inserted into the accommodating cavity of the limiting piece, and the guide piece can be driven by the piston to compress the elastic piece.

According to the pedal simulator disclosed by the embodiment of the utility model, in the practical application process, the pedal simulator is arranged in the valve block, when the piston is pressed by brake fluid, the piston moves downwards to compress the first linear spring, the first linear spring is axially guided by the guide piece, and is axially limited by the limiting piece, so that the first linear spring is prevented from shaking in the radial direction to a larger extent, the structure is more stable, in the compression process of the linear spring, the guide piece can compress the elastic piece under the drive of the piston, the pedal feel curve is ensured to be excessively smoother, the pedal feel is improved, and the driving experience is improved; in addition, the pedal simulator is of a wet structure, internal parts do not need to be subjected to rust prevention, cost is saved, and abnormal sound can be better avoided.

In a first aspect of the present utility model, as an alternative embodiment, the guide member includes a vertical guide portion and a pressing portion formed at an end portion of the lower portion of the vertical guide portion, one end of the vertical guide portion is connected to the piston, the other end of the vertical guide portion is inserted into the accommodating cavity of the limiting member through the first linear spring, and the pressing portion is located in the accommodating cavity, so that the pressing portion can be driven by the piston and the vertical guide portion to compress the elastic member. The pressing part is used for pressing on the elastic piece, when the pressure provided by the brake fluid reaches a certain value, the pressing part is driven by the piston and the vertical guide part to move downwards to be in contact with the elastic piece so as to compress the elastic piece, so that when the contact area between the pressing part and the elastic piece needs to be increased, the diameter of the pressing part only needs to be increased, and the vertical guide part does not need to be adjusted, so that the cost is saved.

In a first aspect of the present utility model, as an optional embodiment, a connecting column is vertically and downwardly extended on an inner top wall of the piston; a threaded hole with a downward opening is formed in the connecting column; the upper portion of vertical guiding portion is formed with screw thread portion, vertical guiding portion pass through screw thread portion with the screw hole of spliced pole realizes threaded connection. Therefore, the vertical guide part and the connecting column can be fixedly connected or separated by screwing or unscrewing the threaded part, and the device has the advantages of convenience in disassembly and convenience in adjustment.

In the first aspect of the present utility model, as an alternative embodiment, the compression assembly further includes a spring seat and a second linear spring;

the spring seat is a tubular piece with an open top, and a cavity is formed in the spring seat; the bottom wall of the spring seat is provided with a first through hole for the vertical guide part to pass through; the spring seat is sleeved outside the connecting column; the upper end of the spring seat is provided with a first flanging extending outwards;

the second linear spring is arranged in the cavity, and two ends of the second linear spring are respectively abutted against the connecting column and the bottom wall of the spring seat;

one end of the vertical guide part sequentially passes through the first through hole and the inner hole of the second linear spring to be in threaded connection with the threaded hole of the connecting column;

the first linear spring surrounds the spring seat, the first end of the first linear spring is abutted to the first turning edge, and the first linear spring and the second linear spring are coaxially and parallelly arranged.

Thus, when the brake is applied, the second linear spring is compressed first, and then the first linear spring is compressed, so that a nonlinear feedback force is generated, and the brake pedal feel of the traditional brake system is simulated. The parallel spring structure adopted in the embodiment reduces the requirement on the installation space in the axial direction, and is beneficial to compact design of the pedal simulator, thereby saving the internal space of the vehicle and being applicable to various installation layouts. In addition, the length of the threaded part entering the threaded hole can be adjusted by rotating the pressing part, so that the force value of the spring force of the first linear spring and the second linear spring can be adjusted.

In a first aspect of the present utility model, as an optional embodiment, the limiting member is a tubular member with an open bottom, and the interior of the limiting member forms the accommodating cavity; the top wall of the limiting piece is provided with a second through hole for the vertical guide part to pass through, the pressing part is positioned in the accommodating cavity, and the diameter of the pressing part is larger than that of the second through hole. The setting like this, through acceping the chamber restriction and supporting the portion of pressing and appear rocking by a relatively large margin along radial direction for the structure is more stable, simultaneously, because the diameter of supporting the portion of pressing is greater than the diameter of second through-hole, makes the roof of locating part can carry out spacingly to the portion of pressing in axial direction.

In the first aspect of the present utility model, as an optional embodiment, a protruding portion extends upward from the top surface of the limiting member, and a third through hole for the vertical guiding portion to pass through is formed in the protruding portion, and the diameter of the third through hole is the same as that of the second through hole. So set up, peg graft in first linear spring through the bellying, can avoid first linear spring to appear rocking along radial for the structure is more stable. Simultaneously, radial limiting is carried out on the vertical guide part through the third through hole.

In the first aspect of the present utility model, as an optional embodiment, the mounting cavity includes a first mounting cavity and a second mounting cavity formed to be communicated with each other from top to bottom; the limiting piece is arranged in the first mounting cavity, and the elastic piece is arranged in the second mounting cavity; the diameter of the first installation cavity is directly larger than that of the second installation cavity, so that a step surface is formed between the first installation cavity and the second installation cavity; the lower extreme of locating part has the second turn-ups of outwards extending, the second turn-ups of locating part butt in on the step face. Thereby, the installation of the limiting piece is convenient and reliable.

In a first aspect of the present utility model, as an alternative embodiment, the elastic member is a disc spring assembly, and the spring force of the first linear spring is greater than the spring force of the second linear spring. The structure of the disc spring is more stable, and the stress of the disc spring is more uniform, so that the force fed back by the disc spring is distributed more uniformly. The pedal simulator of the embodiment has the advantages that the force value adjustment is composed of the first linear spring, the second linear spring and the disc spring assembly, the force value adjustment of the spring force is more accurate, and the pedal simulator is not affected by temperature.

In a first aspect of the present utility model, as an optional embodiment, the valve further comprises a valve block, wherein a piston accommodating cavity and an end cover mounting cavity which are communicated with each other are formed inside the valve block; a hydraulic channel communicated with the piston accommodating cavity is also arranged in the valve block; the piston is movably arranged in the piston accommodating cavity, an installation groove is formed in the outer circumferential surface of the piston, a leather cup is arranged in the installation groove, and the leather cup is positioned between the inner wall of the piston accommodating cavity and the piston; the open end of the end cover is fixedly arranged in the end cover mounting cavity, and an end cover sealing component is further arranged between the end cover mounting cavity and the end cover. Therefore, by arranging the leather cup, the piston is guaranteed to have good installability, and the piston can be installed and detached for many times; by arranging the end cover sealing part, brake fluid in the piston accommodating cavity is blocked by the end cover sealing part, and brake fluid leakage is avoided.

A second aspect of the utility model provides a brake-by-wire system comprising a pedal simulator according to the first aspect of the utility model. The brake-by-wire system can ensure that the pedal feel curve is excessive and smoother, improve the pedal feel and improve the driving experience.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model.

FIG. 1 is a top view of a pedal simulator including a valve block according to an embodiment of the present utility model;

FIG. 2 is a cross-sectional view taken along the direction A-A of FIG. 1;

FIG. 3 is a cross-sectional view of a pedal simulator of an embodiment of the present utility model;

FIG. 4 is a perspective view of a pedal simulator in accordance with an embodiment of the present utility model;

FIG. 5 is an exploded view of a pedal simulator according to an embodiment of the present utility model;

FIG. 6 is a cross-sectional view of a guide according to an embodiment of the present utility model;

FIG. 7 is a cross-sectional view of a piston according to an embodiment of the present utility model;

FIG. 8 is a cross-sectional view of a spring seat according to an embodiment of the present utility model;

FIG. 9 is a cross-sectional view of a stop member according to an embodiment of the present utility model;

fig. 10 is a cross-sectional view of an end cap according to an embodiment of the present utility model.

In the figure:

10. an end cap; 11. a mounting cavity; 111. a first mounting cavity; 112. a second mounting cavity; 113. a step surface;

20. an elastic member;

30. a piston; 31. a receiving chamber; 32. a connecting column; 321. a threaded hole;

41. a limiting piece; 411. a housing chamber; 412. a second through hole; 413. a boss; 414. a third through hole; 415. a second flanging;

42. a first linear spring;

43. a guide member; 431. a vertical guide part; 432. a pressing part; 433. a threaded portion;

44. a spring seat; 441. a cavity; 442. a first through hole; 443. a first flanging;

45. a second linear spring;

50. a valve block; 51. a piston receiving chamber; 52. an end cap mounting cavity; 53. a hydraulic passage;

60. a leather cup;

70. an end cap seal member.

Detailed Description

The present utility model will be further described with reference to the accompanying drawings and detailed description, wherein it is to be understood that, on the premise of no conflict, the following embodiments or technical features may be arbitrarily combined to form new embodiments. Materials and equipment used in this example are commercially available, except as specifically noted. Examples of embodiments are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements throughout or elements having like or similar functionality. The embodiments described below by referring to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements being referred to must have a specific orientation, be configured and operated in a specific orientation, and are therefore not to be construed as limiting the present application. In the description of the present application, the meaning of "a plurality" is two or more, unless specifically stated otherwise.

In the description of the present application, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, or connected via an intermediary, or may be a connection between two elements or an interaction relationship between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

The terms first, second and the like in the description and in the claims of the present application and in the above-described figures, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Example 1

Referring to fig. 1-10, a pedal simulator according to a first embodiment includes an end cap 10, an elastic member 20, a piston 30, and a compression assembly;

specifically, the inside of the end cap 10 is formed with a mounting cavity 11; the top of the mounting cavity 11 forms an opening;

specifically, the elastic member 20 is disposed in the mounting chamber 11;

specifically, the interior of the piston 30 is formed with a receiving chamber 31, and the bottom of the receiving chamber 31 is formed with an opening;

specifically, the compression assembly includes a limiter 41, a first linear spring 42, and a guide 43; the limiting piece 41 is arranged in the mounting cavity 11 and is positioned above the elastic piece 20, and a containing cavity 411 penetrating through the upper surface and the lower surface of the limiting piece 41 is formed in the limiting piece 41; the first end of the first linear spring 42 is axially stopped in the accommodating cavity 31 of the piston 30, and the second end of the first linear spring extends into the mounting cavity 11 and is axially limited by the limiting piece 41; one end of the guide member 43 is connected with the piston 30, and the other end of the guide member 43 passes through the first linear spring 42 and is inserted into the accommodating cavity 411 of the limiting member 41, and the guide member 43 can be driven by the piston 30 to compress the elastic member 20.

On the basis of the above structure, according to the pedal simulator of the embodiment of the utility model, in the practical application process, the pedal simulator is installed in the valve block 50, when the piston 30 is pressed by the brake fluid, the piston 30 moves downwards to compress the first linear spring 42, the first linear spring 42 is axially guided by the guide piece 43, and the first linear spring 42 is axially limited by the limiting piece 41, so that the first linear spring 42 is prevented from shaking in the radial direction to a larger extent, the structure is more stable, and in the compression process of the linear spring, the guide piece 43 can compress the elastic piece 20 under the drive of the piston 30, so that the pedal feel curve is ensured to be excessively smoother, the pedal feel is improved, and the driving experience is improved; in addition, the pedal simulator is of a wet structure, internal parts do not need to be subjected to rust prevention, cost is saved, and abnormal sound can be better avoided.

Referring to fig. 2 and 6, in a preferred embodiment of the present utility model, the guide 43 includes a vertical guiding portion 431 and a pressing portion 432 formed at a lower end of the vertical guiding portion 431, one end of the vertical guiding portion 431 is connected to the piston 30, the other end of the vertical guiding portion 431 passes through the first linear spring 42 to be inserted into the accommodating cavity 411 of the limiting member 41, and the pressing portion 432 is located in the accommodating cavity 411, such that the pressing portion 432 can be driven by the piston 30 and the vertical guiding portion 431 to compress the elastic member 20; the pressing portion 432 is configured to press against the elastic member 20, when the pressure provided by the brake fluid reaches a certain value, the pressing portion 432 is driven by the piston 30 and the vertical guiding portion 431 to move downward to contact with the elastic member 20 to compress the elastic member 20, so that when the contact area between the pressing portion 432 and the elastic member 20 needs to be increased, only the diameter of the pressing portion 432 needs to be increased, and no adjustment is required to be performed on the vertical guiding portion 431, thereby saving cost.

Preferably, the vertical guide portion 431 is fixedly connected with the piston 30 in a detachable connection manner, which has the advantage of convenient detachment.

Referring to fig. 2 and 7, in the preferred embodiment of the present utility model, a connecting post 32 is vertically and downwardly extended from the inner top wall of the piston 30; the connecting post 32 has a screw hole 321 formed therein with a downward opening; the upper portion of the vertical guide portion 431 is formed with a screw portion 433, and the vertical guide portion 431 is screw-coupled with the screw hole 321 of the connection post 32 through the screw portion 433. Thus, by tightening or loosening the screw portion 433, the fixed connection or separation between the vertical guide portion 431 and the connection post 32 can be achieved, and the screw assembly have the advantages of convenience in disassembly and adjustment.

Alternatively, the inside of the connection post 32 is formed with a snap hole with an opening facing downward; the upper portion of the vertical guiding portion 431 is formed with a fastening portion, and the vertical guiding portion 431 is in fastening connection with the fastening hole of the connecting column 32 through the fastening portion. Thus, the vertical guide portion 431 and the connecting post 32 are connected by the buckle, so that the effect of rapid assembly between the two can be achieved.

Referring to fig. 2, 3 and 8, in the preferred embodiment of the present utility model, the compression assembly further includes a spring seat 44 and a second linear spring 45;

specifically, the spring seat 44 is a tubular member with an open top, and a cavity 441 is formed inside the spring seat 44; the bottom wall of the spring seat 44 is provided with a first through hole 442 for the vertical guide portion 431 to pass through; the spring seat 44 is sleeved outside the connecting column 32; the upper end of the spring seat 44 has an outwardly extending first flange 443;

specifically, the second linear spring 45 is disposed in the cavity 441, and two ends of the second linear spring 45 respectively abut against the bottom walls of the connecting post 32 and the spring seat 44;

specifically, one end of the vertical guiding portion 431 sequentially passes through the first through hole 442 and the inner hole of the second linear spring 45 to be in threaded connection with the threaded hole 321 of the connecting post 32;

specifically, the first linear spring 42 surrounds the spring seat 44, the first end of the first linear spring 42 abuts against the first flange 443, and the first linear spring 42 and the second linear spring 45 are coaxially arranged in parallel.

On the basis of the above structure, in the practical application process, when the piston 30 is pressed by the brake fluid, the piston 30 moves downward, the piston 30 drives the connecting column 32 and the vertical guide portion 431 to move downward, meanwhile, the connecting column 32 compresses the second linear spring 45, the second linear spring 45 drives the spring seat 44 to move downward, and the first end of the first linear spring 42 abuts against the first flange 443, so that the spring seat 44 moves downward to compress the first linear spring 42; when the pressure provided by the brake fluid reaches a certain value, the pressing portion 432 is driven by the piston 30 and the vertical guiding portion 431 to move downwards to contact with the elastic member 20, and when the brake fluid pressure continues to increase, the elastic member 20 is compressed until the piston 30 contacts the limiting member 41, and the first linear spring 42, the second linear spring 45 and the elastic member 20 reach the maximum compression stroke. Thus, when braking is applied, the second linear spring 45 is compressed, and then the first linear spring 42 is compressed, generating a nonlinear feedback force, thereby simulating the brake pedal feel of a conventional brake system. The parallel spring structure adopted in the embodiment reduces the requirement on the installation space in the axial direction, and is beneficial to compact design of the pedal simulator, thereby saving the internal space of the vehicle and being applicable to various installation layouts. Further, by rotating the pressing portion 432, the length of the screw 433 that enters the screw hole 321 can be adjusted, and the force value of the spring force of the first linear spring 42 and the second linear spring 45 can be adjusted.

Referring to fig. 9, in a preferred embodiment of the present utility model, the limiting member 41 is a tubular member with an open bottom, and a receiving cavity 411 is formed inside the limiting member 41; the top wall of the limiting member 41 is formed with a second through hole 412 through which the vertical guiding portion 431 passes, the pressing portion 432 is located in the accommodating cavity 411, and the diameter of the pressing portion 432 is larger than that of the second through hole 412. So set up, through holding the cavity 411 restriction to press portion 432 and appear great range rocking along radial direction for the structure is more stable, simultaneously, because the diameter of pressing portion 432 is greater than the diameter of second through-hole 412, makes the roof of locating part 41 can carry out spacing to pressing portion 432 in axial direction.

Referring to fig. 9, in a preferred embodiment of the present utility model, a protruding portion 413 extends upward from the top surface of the limiting member 41, the protruding portion 413 is inserted into the first linear spring 42, a third through hole 414 through which the vertical guiding portion 431 passes is formed in the protruding portion 413, and the third through hole 414 and the second through hole 412 are coaxially arranged and have the same diameter. By means of the arrangement, the protruding portion 413 is inserted into the first linear spring 42, so that the first linear spring 42 can be prevented from shaking along the radial direction, and the structure is more stable. At the same time, the vertical guide 431 is radially limited by the third through hole 414.

Referring to fig. 2 and 10, in a preferred embodiment of the present utility model, the mounting cavity 11 includes a first mounting cavity 111 and a second mounting cavity 112 formed to be communicated with each other from top to bottom; the limiting piece 41 is arranged in the first mounting cavity 111, and the elastic piece 20 is arranged in the second mounting cavity 112; the diameter of the first mounting cavity 111 is directly larger than that of the second mounting cavity 112, so that a step surface 113 is formed between the first mounting cavity 111 and the second mounting cavity 112; the lower end of the limiting piece 41 is provided with a second flanging 415 which extends outwards, and the second flanging 415 of the limiting piece 41 is abutted against the step surface 113. Thereby, the mounting of the stopper 41 is made convenient and reliable.

Referring to fig. 2, in a preferred embodiment of the present utility model, the elastic member 20 is a disc spring assembly, and the spring force of the first linear spring 42 is greater than that of the second linear spring 45. The structure of the disc spring is more stable, and the stress of the disc spring is more uniform, so that the force fed back by the disc spring is distributed more uniformly. The force value adjustment of the pedal simulator of the embodiment is composed of the first linear spring 42, the second linear spring 45 and the disc spring assembly, and the force value adjustment of the spring force is more accurate and is not affected by temperature.

It should be noted that the disc spring assembly may include a plurality of disc spring units, which are sequentially arranged along the reciprocating direction of the piston 30. Wherein, each disc spring unit comprises two disc springs which are buckled and connected. The first linear spring 42 is a high-pressure spring, and the second linear spring 45 is a low-pressure spring.

Alternatively, the disc spring assembly may be divided into thick disc springs and Bao Diehuang, and the combination forms between different kinds of disc springs are different. In this embodiment, a thick disc spring and a thin disc spring are adopted at the same time, and the combination form of the disc spring units can adopt a form of two thick disc spring combinations, two thin disc spring combinations and a form of thick disc spring and thin disc spring composite combinations, so that the variable stroke is increased and the better elastic effect is achieved. In order to ensure the elastic effect of the disc spring assembly, the disc spring units in the embodiment are arranged into at least two groups. Of course, the disc spring units can be arranged in more groups, and the disc spring units can be arranged according to actual conditions. The embodiment can meet different rigidity curve requirements by utilizing different combination characteristics of the disc springs, meanwhile, new disc springs are not required to be additionally designed, die sinking cost is saved, various schemes can be matched by only utilizing different numbers and stacking modes of the existing disc springs, the flexibility is very high, and the manufacturing cost is low.

Referring to fig. 2, in a preferred embodiment of the present utility model, a valve block 50 is further included, and a piston accommodating cavity 51 and an end cap mounting cavity 52 which are mutually communicated are formed inside the valve block 50; the valve block 50 is also provided with a hydraulic passage 53 communicated with the piston accommodating cavity 51; the piston 30 is movably arranged in the piston accommodating cavity 51, an installation groove is formed on the outer peripheral surface of the piston 30, a leather cup 60 is arranged in the installation groove, and the leather cup 60 is positioned between the inner wall of the piston accommodating cavity 51 and the piston; the open end of the end cap is fixedly mounted within the end cap mounting cavity 52, and an end cap seal member 70 is also disposed between the end cap mounting cavity 52 and the end cap. Thus, by arranging the leather cup 60, the piston is ensured to have good installability, and the piston can be installed and detached for a plurality of times; by providing the end cap seal member 70, brake fluid in the piston housing chamber 51 is blocked by the end cap seal member 71, and brake fluid leakage is prevented from occurring. Preferably, the end cap seal member 71 is a seal ring.

Other constructions and operations of pedal simulators according to embodiments of the present utility model are known to those of ordinary skill in the art and will not be described in detail herein.

Example two

The second embodiment is an improvement based on the first embodiment.

A second embodiment provides a brake-by-wire system including a pedal simulator as in the first embodiment. Therefore, the brake-by-wire system can ensure that the pedal feel curve is excessive and smoother, the pedal feel is improved, and the driving experience is improved.

Other components and operation of the brake-by-wire system according to embodiments of the present utility model are known to those of ordinary skill in the art and will not be described in detail herein.

Example III

Embodiment three is an improvement on the basis of embodiment one.

Embodiment three provides a vehicle including a pedal simulator as in embodiment one. Therefore, the vehicle can ensure that the pedal feel curve is excessive and smoother, the pedal feel is improved, and the driving experience is improved.

Other components and operations of a vehicle according to embodiments of the utility model are known to those of ordinary skill in the art and will not be described in detail herein.

Although only certain features and embodiments of the present application have been illustrated and described, many modifications and changes may be made by those skilled in the art without departing substantially from the scope and spirit of the claims, for example: variations in the size, dimensions, structure, shape and proportions of the various elements, mounting arrangements, use of materials, colors, orientations, etc.

The foregoing embodiments are merely preferred embodiments of the present utility model, and are not intended to limit the scope of the embodiments of the present utility model, so that any insubstantial changes and substitutions made by those skilled in the art on the basis of the embodiments of the present utility model fall within the scope of the embodiments of the present utility model.

Claims (10)

1. The pedal simulator is characterized by comprising an end cover, an elastic piece, a piston and a compression assembly;

a mounting cavity is formed in the end cover; an opening is formed at the top of the mounting cavity;

the elastic piece is arranged in the mounting cavity;

the inner part of the piston is provided with a containing cavity, and the bottom of the containing cavity is provided with an opening;

the compression assembly comprises a limiting piece, a first linear spring and a guide piece; the limiting piece is arranged in the mounting cavity and is positioned above the elastic piece, and a containing cavity penetrating through the upper surface and the lower surface of the limiting piece is formed in the limiting piece; the first end of the first linear spring is axially stopped in the accommodating cavity of the piston, and the second end of the first linear spring stretches into the mounting cavity and is axially limited by the limiting piece; one end of the guide piece is connected with the piston, the other end of the guide piece penetrates through the first linear spring to be inserted into the accommodating cavity of the limiting piece, and the guide piece can be driven by the piston to compress the elastic piece.

2. The pedal simulator according to claim 1, wherein the guide member includes a vertical guide portion and a pressing portion formed at a lower end portion of the vertical guide portion, one end of the vertical guide portion is connected to the piston, the other end of the vertical guide portion is inserted into the receiving cavity of the stopper through the first linear spring, and the pressing portion is located in the receiving cavity, so that the pressing portion can be driven by the piston and the vertical guide portion to compress the elastic member.

3. The pedal simulator of claim 2, wherein a connecting post is provided on the inner top wall of the piston extending vertically downward; a threaded hole with a downward opening is formed in the connecting column; the upper portion of vertical guiding portion is formed with screw thread portion, vertical guiding portion pass through screw thread portion with the screw hole of spliced pole realizes threaded connection.

4. The pedal simulator of claim 3, wherein the compression assembly further comprises: a spring seat and a second linear spring;

the spring seat is a tubular piece with an open top, and a cavity is formed in the spring seat; the bottom wall of the spring seat is provided with a first through hole for the vertical guide part to pass through; the spring seat is sleeved outside the connecting column; the upper end of the spring seat is provided with a first flanging extending outwards;

the second linear spring is arranged in the cavity, and two ends of the second linear spring are respectively abutted against the connecting column and the bottom wall of the spring seat;

one end of the vertical guide part sequentially passes through the first through hole and the inner hole of the second linear spring to be in threaded connection with the threaded hole of the connecting column;

the first linear spring surrounds the spring seat, the first end of the first linear spring is abutted to the first turning edge, and the first linear spring and the second linear spring are coaxially and parallelly arranged.

5. The pedal simulator according to any one of claims 2 to 4, wherein the stopper is a tubular member having an open bottom, and the inside of the stopper forms the accommodation chamber; the top wall of the limiting piece is provided with a second through hole for the vertical guide part to pass through, the pressing part is positioned in the accommodating cavity, and the diameter of the pressing part is larger than that of the second through hole.

6. The pedal simulator according to claim 5, wherein a protruding portion is provided on the top surface of the stopper so as to extend upward, and a third through hole for the vertical guide portion to pass through is formed in the protruding portion, and the diameter of the third through hole is the same as the diameter of the second through hole.

7. The pedal simulator according to any one of claims 1 to 4, wherein the mounting chamber includes a first mounting chamber and a second mounting chamber formed to communicate with each other from top to bottom; the limiting piece is arranged in the first mounting cavity, and the elastic piece is arranged in the second mounting cavity; the diameter of the first installation cavity is directly larger than that of the second installation cavity, so that a step surface is formed between the first installation cavity and the second installation cavity; the lower extreme of locating part has the second turn-ups of outwards extending, the second turn-ups of locating part butt in on the step face.

8. The pedal simulator of claim 4, wherein the resilient member is a disc spring assembly and the spring force of the first linear spring is greater than the spring force of the second linear spring.

9. The pedal simulator of any one of claims 1-4, further comprising a valve block having a piston receiving chamber and an end cap mounting chamber formed therein in communication with each other; a hydraulic channel communicated with the piston accommodating cavity is also arranged in the valve block; the piston is movably arranged in the piston accommodating cavity, an installation groove is formed in the outer circumferential surface of the piston, a leather cup is arranged in the installation groove, and the leather cup is positioned between the inner wall of the piston accommodating cavity and the piston; the open end of the end cover is fixedly arranged in the end cover mounting cavity, and an end cover sealing component is further arranged between the end cover mounting cavity and the end cover.

10. A brake-by-wire system comprising a pedal simulator as claimed in any one of claims 1 to 9.