CN107344547B - Electric automobile brake master cylinder assembly - Google Patents
Electric automobile brake master cylinder assembly Download PDFInfo
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- CN107344547B CN107344547B CN201710564833.4A CN201710564833A CN107344547B CN 107344547 B CN107344547 B CN 107344547B CN 201710564833 A CN201710564833 A CN 201710564833A CN 107344547 B CN107344547 B CN 107344547B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
- B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
- B60T8/40—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
- B60T8/4072—Systems in which a driver input signal is used as a control signal for the additional fluid circuit which is normally used for braking
- B60T8/4081—Systems with stroke simulating devices for driver input
- B60T8/4086—Systems with stroke simulating devices for driver input the stroke simulating device being connected to, or integrated in the driver input device
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- Mechanical Engineering (AREA)
- Regulating Braking Force (AREA)
Abstract
The invention discloses an electric automobile brake master cylinder assembly, which comprises a cylinder body provided with an inner cavity, wherein the inner cavity is sequentially provided with a first-stage plunger assembly, a second-stage plunger assembly, a first-stage piston assembly and a second-stage piston assembly from front to back, the pedal simulator comprises a shell with the inner cavity, the inner cavity is composed of a small-diameter hole on the front side and a large-diameter hole on the rear side, the inner diameter of the small-diameter hole is smaller than that of the large-diameter hole, a first-stage piston is arranged in the small-diameter hole, a second-stage piston is arranged in the large-diameter hole, a first-stage spring is arranged between the first-stage piston and the second-stage piston, a second-stage spring is arranged between the second-stage piston and the rear end of the inner cavity, and a liquid inlet communicated with the front side of the small-diameter hole is arranged at the front part of the shell. The invention solves the dangerous conditions of system outage, unexpected outage of a full-decoupling braking system, insufficient braking force and lack of brake fluid, and can simulate the braking sense requirements of different drivers on pedals under the condition of one pedal simulator.
Description
Technical Field
The invention relates to the technical field of automobile braking, in particular to a braking hydraulic system applied to electric automobile braking.
Background
With the rapid development of electric vehicles, the braking system is powered by the electric vehicle by a non-internal combustion engine. The brake system booster portion lacks a vacuum source. And then the electric automobile braking system is forced to change. Therefore, a working mode of decoupling braking action and braking execution in the braking system occurs, wherein the braking action is the action of stepping on a brake pedal by a driver, and the braking execution is the action of acting between a friction plate and a brake disc or a brake drum. In the process of isolating, the braking action of a driver enables the brake discharged by a brake master cylinder not to directly act on a brake actuator and account for a pedal simulator, but when the brake fluid is suddenly in a system power-off state, for example, the brake fluid cannot return to the master cylinder after entering the pedal simulator, and when the braking force of a wheel cylinder is insufficient at this time, the traditional master cylinder cannot meet the special situation when the additional brake fluid is needed for supplementing the wheel cylinder to provide the braking force, so that a container is needed for collecting part of the brake fluid and simulating the feel of a traditional brake pedal.
Disclosure of Invention
The invention aims to solve the technical problem of providing the brake master cylinder assembly of the electric automobile, which can provide extra required brake fluid when a brake system is powered off and the brake fluid is stored in a pedal simulator and simulate the feel of a traditional brake pedal.
In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides an electric automobile brake master cylinder assembly, includes the cylinder body that is equipped with the inner chamber, the inner chamber is equipped with first order plunger assembly, second order plunger assembly, first order piston assembly, second order piston assembly in proper order from front to back, be equipped with first order plunger return spring between first order plunger assembly and the second order plunger assembly, be equipped with second order plunger return spring between second order plunger assembly and the first order piston assembly, be equipped with first order piston return spring between first order piston assembly and the second order piston assembly, be equipped with second order piston return spring between second order piston assembly and the inner chamber rear end, be equipped with P1 chamber between first order plunger assembly and second order plunger assembly, the inner chamber is equipped with P2 chamber between second order plunger assembly and first order piston assembly, be equipped with P3 chamber between first order piston assembly and second order piston assembly, be equipped with P4 chamber between second order piston assembly and the inner chamber rear end, P1 chamber and P2 chamber are connected with the pedal simulator, P3 chamber and P3 chamber are connected to the check valve that the check valve is connected to the one-way valve is connected to the forward to the first order piston assembly, the check valve that the check valve is connected to the first order to the piston assembly; when the brake is stepped on under the normal state, the brake fluid in the P1 cavity and the P2 cavity enters the pedal simulator, when the brake system is powered off, the brake pedal is stepped on downwards, and when the braking force is insufficient, a driver deeply steps on the pedal, so that the first-stage piston assembly and the second-stage piston assembly continue to move backwards, and finally the brake fluid in the P3 cavity and the P4 cavity enter the wheel cylinder to compensate the braking force, the pedal simulator comprises a shell with an inner cavity, the inner cavity is composed of a small-diameter hole on the front side and a large-diameter hole on the rear side, the inner diameter of the small-diameter hole is smaller than the inner diameter of the large-diameter hole, a first-stage piston is arranged in the small-diameter hole, a second-stage piston is arranged in the large-diameter hole, a first-stage spring is arranged between the first-stage piston and the second-stage piston, a second-stage spring is arranged between the second-stage piston and the rear end of the inner cavity, and a liquid inlet hole communicated with the front side of the small-diameter hole is arranged at the front part of the shell.
Preferably, the P1 chamber is connected to the pedal simulator via a normally closed solenoid valve, and the P2 chamber is connected to the pedal simulator via a normally open solenoid valve.
Preferably, the rear part of the inner cavity is a stepped hole with the diameter larger than that of the front part, a one-way valve hole is respectively processed on the side wall of the stepped hole corresponding to the position of the P3 cavity and the position of the P3 cavity, and a one-way valve is arranged in the one-way valve hole.
Preferably, the check valves on the first-stage piston assembly and the second-stage piston assembly are composed of a piston check valve spring, a check valve seat and a sealing steel ball, a valve hole is formed in the check valve seat, and the sealing steel ball is used for sealing the valve hole in a one-way mode under the action of the piston check valve spring.
Preferably, a rubber spring is further arranged between the primary piston and the secondary piston, and a force superposition transition zone is arranged between the secondary spring and the rubber spring.
Preferably, the rear part of the primary piston is provided with a first convex column, the first convex column is provided with a spring mounting hole for mounting a rubber spring, the front part of the secondary piston is provided with a step convex column, the step convex column is movably connected in the spring mounting hole and can compress the rubber spring, and the primary spring is connected on the first convex column and the step convex column.
Preferably, the rubber spring is a cylinder with a through center and an axial direction.
Preferably, the rear end of the inner cavity is closed by a rear end cover, the rear end cover is in threaded connection with the inner wall of the large-diameter hole, and the pretightening force of the secondary spring is preset according to different screwing depths.
Preferably, the secondary spring is composed of a secondary large spring and a secondary small spring.
Preferably, the rear part of the secondary piston is provided with a second convex column, the front side of the rear end cover is provided with a third convex column, and the secondary small spring is connected to the second convex column and the third convex column.
By adopting the technical scheme, the invention has the following beneficial effects:
when the brake is stepped on in a normal state, the P1 and P2 cavity brake fluid enters the pedal simulator. When the system is powered off in an abnormal state and the brake pedal is already depressed and the braking force is insufficient, the driver deeply depresses the pedal, and the P3 and P4 cavity brake fluid enters the wheel cylinders to compensate the braking force. Therefore, the dangerous conditions that the system is powered off and the full-decoupling braking system is powered off accidentally, the braking force is insufficient and the braking liquid is in a missing state are solved, and the braking liquid in the storage cavity can not influence the braking feeling in a conventional braking state.
When a driver steps on the brake master cylinder, brake fluid discharged from the brake master cylinder flows through the shell fluid inlet hole and enters a cavity formed by the small-diameter hole and the primary piston. The first stage brake fluid moves backward when entering the chamber through the fluid inlet, and meanwhile, the first stage spring is stressed to start compressing, and the stage is a stage of simulating the elastic deformation of the brake system in the rapid pressurization stage. When the pressure in the chamber reaches a certain value and reaches the pressure generated by the pretightening force of the secondary spring, the secondary spring starts to work, and the secondary spring is used for simulating the rigid braking stage of the braking system when the secondary spring is compressed. Therefore, under the condition of one pedal simulator, the braking feeling requirements of different drivers on the pedal can be simulated, and meanwhile, the braking pedal feeling of a traditional braking system can be simulated through multiple stages, so that the traditional braking pedal feeling can be very well matched.
Drawings
The invention is further described with reference to the drawings and detailed description which follow:
fig. 1 is a schematic view of a liquid outlet end of a brake master cylinder of an electric automobile.
Fig. 2 is a schematic view of the inlet end of the brake master cylinder of the electric vehicle.
Fig. 3 is a schematic diagram of a cylinder of an electric vehicle brake master cylinder.
FIG. 4 is a schematic illustration of a primary piston assembly/secondary piston assembly of an electric vehicle brake master cylinder.
Fig. 5 is a schematic view of a rear cover of an electric vehicle brake master cylinder.
Fig. 6 is a schematic diagram of a conventional state of a brake master cylinder of an electric vehicle.
Fig. 7 is a schematic diagram of a secondary working stage of the brake master cylinder of the electric automobile.
Fig. 8 is a schematic diagram of a third stage of operation of the electric vehicle master cylinder.
Fig. 9 is a schematic overall structure of the pedal simulator.
Fig. 10 is a schematic diagram of the housing of the pedal simulator.
FIG. 11 is a schematic illustration of a primary piston of the pedal simulator.
FIG. 12 is a schematic of a secondary piston of the pedal simulator.
Fig. 13 is a schematic view of a pedal simulator rear end cap.
Fig. 14 is a schematic view of an initial operation stage of the pedal simulator.
Fig. 15 is a schematic diagram of the pedal simulator in a second stage of operation.
FIG. 16 is a schematic illustration of a third stage of operation of the pedal simulator.
Detailed Description
The technical solutions of the embodiments of the present invention will be explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the examples in the implementation manner, other examples obtained by a person skilled in the art without making creative efforts fall within the protection scope of the present invention.
An electric automobile brake master cylinder assembly comprises a brake master cylinder and a pedal simulator.
The embodiment of a brake master cylinder is shown in fig. 1 and 2, and an electric automobile brake master cylinder comprises a cylinder body 3 with an inner cavity, wherein the inner cavity is sequentially provided with a first-stage plunger assembly 1, a second-stage plunger assembly 2, a first-stage piston assembly 4 and a second-stage piston assembly 6 from front to back, a first-stage plunger return spring is arranged between the first-stage plunger assembly 1 and the second-stage plunger assembly 2, a second-stage plunger return spring is arranged between the second-stage plunger assembly 2 and the first-stage piston assembly 4, and Y-shaped sealing rings 12 are arranged on the first-stage plunger assembly 1 and the second-stage plunger assembly 2. The novel pedal simulator is characterized in that a first-stage piston return spring 5 is arranged between the first-stage piston assembly 4 and the second-stage piston assembly 6, a second-stage piston return spring 7 is arranged between the second-stage piston assembly 6 and the rear end of an inner cavity, a P1 cavity is arranged between the first-stage piston assembly 1 and the second-stage piston assembly 2 in the inner cavity, a P2 cavity is arranged between the second-stage piston assembly 2 and the first-stage piston assembly 4 in the inner cavity, a P3 cavity is arranged between the first-stage piston assembly 4 and the second-stage piston assembly 6 in the inner cavity, a P4 cavity is arranged between the second-stage piston assembly 6 and the rear end of the inner cavity, the P1 cavity and the P2 cavity are connected with a pedal simulator, the P3 cavity and the P3 cavity are connected with a wheel cylinder, the P3 cavity is connected with a one-way valve which is communicated with the P1 cavity in one way, the P4 cavity is connected with a one-way valve which is communicated with the P2 cavity in one way, and the first-stage piston assembly 4 and the second-stage piston assembly 6 are provided with one-way valves which are communicated from front to back.
When the brake is stepped on in a normal state, the brake fluid in the P1 cavity and the P2 cavity enters the pedal simulator, when the brake system is powered off, the brake pedal is stepped on and the braking force is insufficient, a driver deeply steps on the pedal, the first-stage piston assembly and the second-stage piston assembly continue to move backwards, and finally the brake fluid in the P3 cavity and the P4 cavity enters the wheel cylinder to compensate the braking force.
As shown in fig. 1 and 3, the rear part of the inner cavity is a stepped hole 31 with a diameter larger than that of the front part, the side wall of the stepped hole is respectively provided with a one-way valve hole 32 corresponding to the position of the P3 cavity and the position of the P3 cavity, and a one-way valve is arranged in the one-way valve hole. The one-way valve hole is integrated with a one-way valve consisting of a cylinder one-way valve steel ball 9, a cylinder one-way valve spring 10 and a cylinder one-way valve check ring 11. The rear port of the inner cavity is provided with a positioning step hole 33, and the positioning step hole is provided with an internal thread.
As shown in fig. 1 and 5, the rear cover 8 is provided with a connection boss, an external thread 81 is processed on the connection boss, a sealing ring groove 82 is arranged between the rear end of the connection boss and the rear part of the rear cover, the rear cover is connected with the inner port of the inner cavity through the external thread 81 in an internal thread manner, and a sealing ring sealed with the rear port of the inner cavity is arranged in the sealing ring groove.
As shown in fig. 4, the first stage piston assembly 4 and the second stage piston assembly 6 comprise a piston body 41/61, a stepped valve hole is formed in the center of the piston body, a check valve is arranged in the stepped valve hole and is composed of a piston check valve spring 43/63, a check valve seat 44/64 and a sealing steel ball 45/65, the check valve seat 44/64 is provided with a valve hole, and the sealing steel ball 45/65 is used for sealing the valve hole in a one-way under the action of the check valve spring 43/63. A sealing groove is arranged on the outer circle of the piston body, and a sealing ring 42/62 is arranged in the sealing groove.
As shown in fig. 6, in the brake actuating portion of the completely decoupled structure of the brake system of the electric vehicle composed of the master cylinder, the P1 chamber is connected with the pedal simulator via a normally closed electromagnetic valve, and the P2 chamber is connected with the pedal simulator via a normally open electromagnetic valve. The P1 cavity is communicated with the P4 cavity, and the P2 cavity is communicated with the P3 cavity.
In the conventional braking process, the brake fluid of the spare brake fluid chamber cannot flow out to affect the conventional braking system, and the brake fluid of the spare chamber can compensate the wheel cylinder only when the pressure of the wheel cylinder is insufficient, so that the compensation braking is realized.
As shown in fig. 7, the brake pressure build-up and the brake fluid flow direction during the normal operation of the brake actuating portion constituted by the present invention are shown. When a driver executes braking, an inflow wheel cylinder pipeline is closed by an electromagnetic valve, the electromagnetic valve which flows into a pedal simulator is opened to push the first plunger assembly 1 to move forwards, pressure P1 and pressure P2 are established in two plunger assembly chambers, pressure P3 and pressure P4 are established in two piston chambers of a liquid storage chamber, a one-way valve delta P4 is arranged between the P1 chamber and the P4 chamber, and a one-way valve delta P3 is arranged between the P2 chamber and the P3 chamber, so that brake liquid in the P3 chamber and the P4 chamber cannot enter the pedal simulator.
As shown in fig. 8, the brake pressure is established and the flow direction of the brake fluid is schematically shown when the brake executing section is powered off and disabled. When the brake pedal is deeply stepped, a driver can make the first piston assembly 4 and the second piston assembly 6 continuously move forwards to raise the pressure of the chambers P3 and P4, so that P4 is more than P1 and P3 is more than P2, and the check valve on the cylinder body can be pushed open to supplement the braking force for the wheel cylinder.
When the brake master cylinder is in an electric interruption state of the decoupling brake system, after the brake fluid is sealed in the pedal simulator, and the brake fluid is insufficient, and when the brake force is not reached, the brake force is compensated by a method of compensating the brake fluid by inertia deep stepping of a driver. The brake master cylinder can provide additional needed brake fluid when the brake system is powered off and the brake fluid is stored in the pedal simulator, and meanwhile, the brake of the system is not affected during conventional braking.
According to the invention, the problem that the braking force of the wheel cylinder is insufficient under the condition of power failure of the braking system, and the situation that the braking fluid is insufficient and cannot provide braking for the wheel cylinder fluid supply due to the insufficient braking fluid is solved, so that the safety of the braking system is improved.
First embodiment of pedal simulator, as shown in fig. 9 and 10, an electric automobile brake pedal simulator comprises a housing 1 with an inner hole, wherein the inner hole is composed of a small diameter hole 12 at the front side and a large diameter hole 13 at the rear side, the rear end of the inner hole is sealed by a rear end cover 7, the rear part of the large diameter hole is provided with an internal thread 14, the inner diameter of the small diameter hole is smaller than that of the large diameter hole, a primary piston 2 is arranged in the small diameter hole, a secondary piston 5 is arranged in the large diameter hole, a primary spring 4 is arranged between the primary piston 2 and the secondary piston 5, a secondary spring 6 is arranged between the secondary piston and the rear end of the inner hole, the front part of the housing is provided with a liquid inlet hole 11 communicated with the front side of the small diameter hole, and a chamber is formed between the primary piston 2 and the front end of the inner hole.
When a driver presses the brake master cylinder, brake fluid discharged from the brake master cylinder flows through the shell fluid inlet hole 11 and enters a cavity formed by the small-diameter hole and the primary piston. The first stage brake fluid moves backward when entering the chamber through the fluid inlet 11, and meanwhile, the first stage spring 4 is stressed to start compressing, and the stage is a rapid pressurization stage for simulating the elastic deformation stage of the brake system. When the pressure in the chamber reaches a certain value and reaches the pressure generated by the pretightening force of the secondary spring 6, the secondary spring 6 starts to work, and the secondary spring 6 is used for simulating the rigid braking stage of the braking system when being compressed. Therefore, under the condition of one pedal simulator, the braking feeling requirements of different drivers on the pedal can be simulated, and meanwhile, the braking pedal feeling of a traditional braking system can be simulated through multiple stages, so that the traditional braking pedal feeling can be very well matched.
As shown in fig. 9 and 11, the outer circle of the primary piston 2 is provided with a first sealing ring groove 21, the primary piston 2 is arranged in the small-diameter hole, the first sealing ring groove 21 is provided with a primary piston sealing ring 8 and a retainer ring 9 for sealing with the inner wall of the small-diameter hole, a first piston annular end surface 23 at the rear side of the primary piston is used for supporting the front end of the primary spring 4, the rear part of the primary piston is provided with a first convex column 24, and the front part of the primary spring is sleeved on the first convex column 24.
As shown in fig. 9 and 12, the outer circle of the secondary piston 5 is provided with a second seal ring groove 53, the second seal ring groove 53 is internally provided with a secondary piston seal ring 10, and the secondary piston 5 is arranged in the large-diameter hole 13 and limited by a step between the large-diameter hole 13 and the small-diameter hole 12. The front part of the secondary piston is provided with a step convex column 51, the step convex column 51 consists of a small diameter part at the front part and a large diameter part at the rear part, the diameter of the small diameter part is smaller than that of the large diameter part, and the rear part of the primary spring is sleeved on the step convex column 51 and is abutted with the annular end surface of the second piston. The rear part of the secondary piston is provided with a second convex column 54, the rear side of the secondary piston is provided with a third piston annular end surface 52 and a fourth piston annular end surface which encircle the second convex column 54, and the third piston annular end surface 52 protrudes backwards from the fourth piston annular end surface.
As shown in fig. 9 and 13, the rear end cap 7 is provided with a third boss 71 protruding forward and a fifth piston annular end face 72 protruding forward from the sixth piston annular end face, and the third boss 71 protrudes from the fifth piston annular end face 72. The rear end cap is provided at the rear with a threaded section 73 which is screwed with the internal thread at the rear of the large diameter hole. In addition, the rear end center of the rear end cover is provided with an inner hexagonal hole 74 for being connected with a wrench, so that the rear end cover is conveniently driven to rotate by the wrench. And presetting the pretightening force of the secondary spring according to different screwing depths. The pedal feel can set the pretightening force of the secondary spring through the screwing depth of the rear end cover in the shell, so that the braking characteristics of different brakes are simulated, parts in the brake are not required to be replaced, and the pedal feel device has great universality.
As shown in fig. 9, the second embodiment of the pedal simulator is different from embodiment 1 in that a rubber spring 3 is further provided between the primary piston 2 and the secondary piston 5, and a force overlapping transition zone is provided between the secondary spring 6 and the rubber spring 3. The pedal feeling can be well simulated, and the force abrupt change feeling can be eliminated.
When the pressure in the cavity reaches a certain value, the secondary piston 5 starts to extrude the rubber spring 3, and the pressure in the primary piston continues to be increased to the pressure generated by the pretightening force of the secondary spring, the secondary spring starts to work. The simulated brake pedal feel is divided into three stages, and the three-stage sectional work can simulate the pedal feel well.
As shown in fig. 11, the first boss 24 is provided with a spring mounting hole 22 for mounting the rubber spring 3. As shown in fig. 4, the small diameter portion of the stepped boss 51 is movably connected in the spring mounting hole 22 and can compress the rubber spring 3, and further, the rubber spring 3 is a cylinder with a central axial penetration so as to facilitate compression and generate elastic force.
In addition, as shown in fig. 9, in the above two embodiments, two secondary springs 6 may be employed, and the secondary springs 6 are composed of a secondary large spring and a secondary small spring, the diameter of the secondary large spring being larger than that of the secondary small spring and the compression force being larger than that of the secondary small spring. To promote the operational reliability of the secondary spring 6. The second-stage big spring is nested on the outer circle side of the second-stage small spring, the front part of the second-stage small spring is sleeved on the second convex column 54, the rear part of the second-stage small spring is sleeved on the third convex column 71, the front end of the second-stage small spring is abutted with the third piston annular end face 52, the rear end of the second-stage small spring is abutted with the fifth piston annular end face 72, the front end of the second-stage big spring is abutted with the fourth piston annular end face, and the rear end of the second-stage big spring is abutted with the sixth piston annular end face.
As shown in fig. 14, the brake fluid discharged by the driver pressing down the master cylinder flows through the fluid inlet hole 11 into the piston chamber formed by the small diameter hole 12 and the primary piston 2. When the first-stage brake fluid enters the piston cavity, the first-stage piston moves backwards, meanwhile, the first-stage spring 4 starts to compress under the stress, when the first-stage piston moves for S displacement, the piston cavity builds P1-stage pressure, and the stage is a rapid pressurization stage for simulating the elastic deformation stage of the brake system and starts to compress the rubber spring 3. At this point, the second stage of operation is ready to be entered.
As shown in fig. 15, the rubber spring 3 is fully compressed when the primary piston 2 moves from S to S1. The small diameter part at the front part of the stepped convex column 51 of the primary piston 2 and the secondary piston 5 are matched with each other through a hole shaft to reach the limit position, the rubber spring 3 is compressed to the maximum, and the secondary spring 6 starts to be compressed at the moment. At this point the piston chamber pressure is at stage P2. The pressure builds up in this phase with the compression of the rubber spring 3 for simulating the transition state when the brake system changes from the elastic system to the rigid.
As shown in fig. 16, when the piston moves from S1 to S2, only the secondary spring 6 is operated, and the pressure in the piston chamber is at the stage P3, which is used for simulating the rigid braking stage of the braking system.
In the working process of the pedal-sensing automobile brake pedal simulator, the stage of rapid pressure increase of the brake system is firstly simulated, the elastic expansion process of each component of the brake system is simulated, the rigidity of the brake system is unchanged, the brake pressure is not greatly influenced by the system in the stage, and the brake pressure is influenced by the elasticity of brake fluid. The rigidity of different braking system rigidity stages can be simulated through the pretightening force of the second-stage spring 6 adjusted by the rear end cover 7. Therefore, the invention can provide a very excellent pedal feel, is adjustable and greatly expands the application range.
In the first and second embodiments of the pedal simulator, the terms "front" and "rear" are used with reference to the liquid inlet hole as a front, and the positions of the respective components of the invention are described without being construed as limiting the invention.
While the invention has been described in terms of embodiments, it will be appreciated by those skilled in the art that the invention is not limited thereto but rather includes the drawings and the description of the embodiments above. Any modifications which do not depart from the functional and structural principles of the present invention are intended to be included within the scope of the appended claims.
Claims (10)
1. The utility model provides an electric automobile brake master cylinder assembly, includes the cylinder body that is equipped with the inner chamber, its characterized in that, the inner chamber is equipped with first order plunger assembly, second order plunger assembly, first order piston assembly, second order piston assembly in proper order from front to back, be equipped with first order plunger return spring between first order plunger assembly and the second order plunger assembly, be equipped with second order plunger return spring between second order plunger assembly and the first order piston assembly, be equipped with first order piston return spring between first order piston assembly and the second order piston assembly, be equipped with second order piston return spring between second order piston assembly and the inner chamber rear end, be equipped with P1 chamber between first order plunger assembly and second order plunger assembly, the inner chamber is equipped with P2 chamber between second order plunger assembly and first order piston assembly, be equipped with P3 chamber between first order piston assembly and second order piston assembly, be equipped with P4 chamber between second order piston assembly and the inner chamber rear end, P1 chamber and P2 chamber are connected with the simulator, P3 chamber and P3 chamber are connected to the one-way valve that the one-way valve is connected to the one-way valve forward to the first order piston assembly, P1 chamber is connected to the one-way valve that the one-way valve is connected to the first order to the front to the piston assembly; when the brake is stepped on under the normal state, the brake fluid in the P1 cavity and the P2 cavity enters the pedal simulator, when the brake system is powered off, the brake pedal is stepped on downwards, and when the braking force is insufficient, a driver deeply steps on the pedal, so that the first-stage piston assembly and the second-stage piston assembly continue to move backwards, and finally the brake fluid in the P3 cavity and the P4 cavity enter the wheel cylinder to compensate the braking force, the pedal simulator comprises a shell with an inner cavity, the inner cavity is composed of a small-diameter hole on the front side and a large-diameter hole on the rear side, the inner diameter of the small-diameter hole is smaller than the inner diameter of the large-diameter hole, a first-stage piston is arranged in the small-diameter hole, a second-stage piston is arranged in the large-diameter hole, a first-stage spring is arranged between the first-stage piston and the second-stage piston, a second-stage spring is arranged between the second-stage piston and the rear end of the inner cavity, and a liquid inlet hole communicated with the front side of the small-diameter hole is arranged at the front part of the shell.
2. The electric vehicle brake master cylinder assembly of claim 1, wherein: the P1 cavity is connected with the pedal simulator through a normally closed electromagnetic valve, and the P2 cavity is connected with the pedal simulator through a normally open electromagnetic valve.
3. The electric vehicle brake master cylinder assembly of claim 1, wherein: the rear part of the inner cavity is provided with a stepped hole with the diameter larger than that of the front part, the side wall of the stepped hole is respectively provided with a one-way valve hole in a machining mode corresponding to the positions of the P3 cavity and the P3 cavity, and a one-way valve is arranged in the one-way valve hole.
4. The electric vehicle brake master cylinder assembly of claim 1, wherein: the check valves on the first-stage piston assembly and the second-stage piston assembly are composed of a piston check valve spring, a check valve seat and a sealing steel ball, a valve hole is formed in the check valve seat, and the sealing steel ball is used for sealing the valve hole in a one-way mode under the action of the piston check valve spring.
5. The electric vehicle brake master cylinder assembly of claim 1, wherein: a rubber spring is further arranged between the primary piston and the secondary piston, and a force superposition transition zone is arranged between the secondary spring and the rubber spring.
6. The electric vehicle brake master cylinder assembly of claim 5, wherein: the rear part of the primary piston is provided with a first convex column, the first convex column is provided with a spring mounting hole for mounting a rubber spring, the front part of the secondary piston is provided with a step convex column, the step convex column is movably connected in the spring mounting hole and can compress the rubber spring, and the primary spring is connected on the first convex column and the step convex column.
7. The electric vehicle brake master cylinder assembly of claim 5, wherein: the rubber spring is a cylinder with a through center in the axial direction.
8. The electric vehicle brake master cylinder assembly according to any one of claims 1 to 7, wherein: the rear end of the inner cavity is sealed by a rear end cover, the rear end cover is in threaded connection with the inner wall of the large-diameter hole, and the pretightening force of the secondary spring is preset according to different screwing depths.
9. The electric vehicle brake master cylinder assembly of claim 8, wherein: the secondary spring consists of a secondary large spring and a secondary small spring.
10. The electric vehicle brake master cylinder assembly of claim 9, wherein: the rear part of the secondary piston is provided with a second convex column, the front side of the rear end cover is provided with a third convex column, and the secondary small spring is connected to the second convex column and the third convex column.
Priority Applications (1)
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| CN201710564833.4A CN107344547B (en) | 2017-07-12 | 2017-07-12 | Electric automobile brake master cylinder assembly |
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| CN201710564833.4A CN107344547B (en) | 2017-07-12 | 2017-07-12 | Electric automobile brake master cylinder assembly |
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| CN107344547B true CN107344547B (en) | 2023-08-22 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205601818U (en) * | 2016-05-09 | 2016-09-28 | 常州机电职业技术学院 | Hydraulic pressure helping hand brake master cylinder |
| CN205769238U (en) * | 2016-06-03 | 2016-12-07 | 北京英创汇智科技有限公司 | Brakes is partly decoupled for new-energy automobile regenerative braking |
| CN207173573U (en) * | 2017-07-12 | 2018-04-03 | 浙江亚太机电股份有限公司 | A kind of electric vehicle brake master cylinder assembly |
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- 2017-07-12 CN CN201710564833.4A patent/CN107344547B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205601818U (en) * | 2016-05-09 | 2016-09-28 | 常州机电职业技术学院 | Hydraulic pressure helping hand brake master cylinder |
| CN205769238U (en) * | 2016-06-03 | 2016-12-07 | 北京英创汇智科技有限公司 | Brakes is partly decoupled for new-energy automobile regenerative braking |
| CN207173573U (en) * | 2017-07-12 | 2018-04-03 | 浙江亚太机电股份有限公司 | A kind of electric vehicle brake master cylinder assembly |
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