CN219487414U - Pedal travel simulation mechanism for brake-by-wire - Google Patents

Abstract

The utility model relates to the field of brake-by-wire systems, and discloses a pedal stroke simulation mechanism for brake-by-wire. The magnet assembly is installed on the push rod assembly, and the magnet assembly includes the magnetite, and the booster lid is used for closing cap booster, and the booster lid includes the guiding part, and the guiding part has along the direction inner chamber of push rod assembly axial setting, and the opening with external intercommunication has been seted up to the side chamber wall of direction inner chamber, and the magnet assembly slides and establishes in the direction inner chamber. The magnet assembly and the stroke sensor are arranged in the same space, the middle of the magnet assembly is blocked by the shell without the booster, the distance between the magnet and the sensor chip can be greatly shortened, the magnetic field intensity induced by the chip can be enhanced, and the working accuracy of the sensor is ensured. The brake-by-wire booster assembly can more accurately output the required brake fluid pressure and simultaneously can reduce the cost in the production and manufacturing process.

Description

Pedal travel simulation mechanism for brake-by-wire

Technical Field

The utility model relates to the field of brake-by-wire systems, in particular to a pedal stroke simulation mechanism for brake-by-wire.

Background

In production, the existing sensor and magnet are complex in structure and are separated from a shell with a booster between the sensors. For example, the Chinese utility model with publication number of CN218367750U discloses a dry type electronic pedal simulator for a wire control system, and designs the dry type electronic pedal simulator for the wire control system, wherein the electronic pedal simulator comprises a simulator valve body, a push rod and a push rod, one end of a magnet support is sleeved outside the other end of the push rod, a plurality of magnets are arranged at the other end of the magnet support, and displacement sensors are respectively arranged at the upper side and the lower side of the simulator valve body. The electronic pedal simulator has higher requirements on the machining and assembling precision of all parts of the assembly, and because the magnet is separated from the shell of the booster between the sensors, and the distance is larger, the magnet with higher cost is needed. In addition, the magnet is easy to swing circumferentially in the reciprocating motion, and the pedal simulator has poor repeated positioning precision, so that the situation that the braking pressure of the brake master cylinder is insufficient or overlarge is caused, the situation is more obvious in bumpy road conditions of the vehicle, and huge hidden danger is brought to driving safety.

In order to solve the problem, a new pedal simulation mechanism structure and installation mode in a linear control power booster are needed to achieve the purposes of solving the problem of poor repeated positioning precision of the existing pedal simulator and reducing the production and manufacturing cost.

Disclosure of Invention

Aiming at the defects of poor repeated positioning precision, high production and manufacturing precision and high cost of a pedal simulator in the prior art, the utility model provides a pedal stroke simulation mechanism for brake-by-wire.

The technical problems are solved, and the utility model is solved by the following technical scheme:

a pedal stroke simulation mechanism for brake-by-wire comprises a push rod assembly, a magnet assembly, a booster cover body and a stroke sensor, wherein the push rod assembly is used for being connected with a pedal and axially transmitting pedal displacement. The magnet assembly is installed on the push rod assembly, and the magnet assembly comprises a magnet.

The booster cover body is used for sealing the booster, the booster cover body comprises a guide part, the guide part is provided with a guide inner cavity axially arranged along the push rod assembly, an opening communicated with the outside is formed in the side cavity wall of the guide inner cavity, the magnet assembly is slidably arranged in the guide inner cavity, and the magnet is exposed out of the booster cover body through the opening.

The travel sensor comprises a sensor shell and a circuit board for inducing the displacement of the magnet, the sensor shell is fixedly arranged on the cover body of the booster, and the circuit board is attached to the opening of the guide part right opposite to the guide inner cavity. The travel sensor is limited through the outer side surface of the guide part, and the magnet assembly is limited through the inner cavity of the guide part, so that the moving direction of the magnet is accurate due to the adoption of the same component, and the travel sensor is more accurate in judging the displacement of the magnet.

Preferably, the magnet assembly comprises a mounting shell, a first mounting groove is formed in the mounting shell, the magnet is embedded in the first mounting groove and is sealed and covered by an upper cover, and a plurality of sliding blocks are circumferentially arranged on one side, far away from the first mounting groove, of the mounting shell. The installation shell of the magnet assembly is firmly fixed relative to the output rod, and the magnet is accurately limited in the first installation groove relative to the installation shell, so that pedal stroke simulation can be more accurate.

Preferably, the installation shell is columnar, the outer side face of the installation shell consists of an arc face on one side and a plane on the other side, the first installation groove is formed in the plane, the arc face is provided with a clamping groove for accommodating the sliding block, the sliding block is circumferentially and uniformly arranged in the clamping groove of the arc face, and elastic rubber is coated on the inner side of the sliding block. When the assembled elastic rubber rear slider assembly slides in the booster cover body, the slider assembly is in a compressed state, if the slider generates a circumferential gap in the surface booster cover body due to sliding abrasion, the elastic rubber can compensate the circumferential gap, so that the slider is always pressed in the cavity wall of the guide inner cavity.

Preferably, the push rod assembly comprises a U-shaped fork, an input rod and an output rod, wherein the input rod is movably riveted with the output rod and axially and relatively fixed, one end of the U-shaped fork is used for being connected with a pedal, the other end of the U-shaped fork is fixedly connected with the input rod, and the input rod and the output rod are used for transmitting the input force of the pedal and can synchronously and axially move. The input of push rod assembly is U type fork, and U type fork is connected with brake pedal, and the trample power of trampling brake pedal with the driver through the footboard ratio is enlarged, leads to the fact the extrusion force to U type fork to extrusion brake input pole removes, and then promotes the motion of output pole, and the displacement information of output pole is gathered through displacement sensor response magnetite displacement, and gives electrical system with displacement information transfer, and electrical system can make electrical power assisting system start operation according to displacement information, and at this moment, driving motor in the booster begins the operation and produces the helping hand.

Preferably, the output rod is provided with a convex column for installing a magnet assembly on one side close to the input rod, and the magnet assembly is fixed on the convex column and is axially limited through a limiting retainer ring. The inner hole of the magnet assembly is matched with the outer ring of the convex column, and the magnet assembly is limited by the front limiting retainer ring and the rear limiting retainer ring in the axial direction, so that the magnet assembly is firmly fixed on the input rod and moves synchronously with the input rod.

Preferably, the stroke sensor is L-shaped, a second mounting groove is formed in one side, opposite to the magnet assembly, of the shell, the circuit board is arranged in the second mounting groove, the magnet is in a block shape, and when the magnet is arranged in the first mounting groove, the outer side surface of the magnet is parallel to the circuit board. Compared with the traditional rectangular structure, the L-shaped structure can enable the stroke sensor to be fixed more firmly.

Preferably, the surface of the booster cover body is provided with a limiting groove, the side groove wall of the limiting groove is provided with a limiting hole, and the corner of the sensor shell is matched with the limiting groove in shape. The sensor shell is matched with the surface of the booster cover body, and the sensor shell is prevented from shaking relative to the booster cover body.

Preferably, the side groove wall of the limiting groove is provided with a limiting hole, the part of the sensor shell, which is not provided with the circuit board, is provided with lugs on the left side and the right side, and the lugs are fixed with the limiting hole through bolts.

Preferably, the sensor housing is provided with a limit protrusion at the outer edge of the bottom surface at one side of the booster cover, and the limit protrusion is sealed with the booster cover through a sealing piece. The sealing element can be a sealing ring, sealant and other parts capable of adaptively deforming according to the shape of the gap, and the sealing element is clamped between the sensor shell and the booster cover body to fill the gap, so that the sensor shell is completely attached to the booster cover body.

The utility model has the remarkable technical effects due to the adoption of the technical scheme:

(1) The magnet assembly is axially fixed on the push rod assembly, the lateral side is limited by the booster cover body, the limiting structure is simple and reliable, the magnet assembly is kept on and clings to the input rod, when the input rod and the output rod axially move, the magnet cannot swing left and right, and the stroke of the pedal can be judged more accurately through the stroke sensor.

(2) The travel sensor and the magnet are limited through the guide part of the travel sensor, and the upper part and the magnet are limited by adopting the same part, so that the influence on the pedal positioning precision due to production and assembly is reduced.

(3) The magnet assembly and the stroke sensor are arranged in the same space, the middle of the magnet assembly is blocked by the shell without the booster, the distance between the magnet and the sensor chip can be greatly shortened, the magnetic field intensity induced by the chip can be enhanced, and the working accuracy of the sensor is ensured. The brake-by-wire booster assembly can more accurately output the required brake fluid pressure and simultaneously can reduce the cost in the production and manufacturing process.

(4) Because the distance between the magnet and the sensor chip is reduced, the magnet with weaker magnetic field strength can be selected to reduce the cost of parts under the condition of meeting the working precision of the sensor.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a perspective view of the booster cap of the present utility model;

FIG. 3 is a view showing the structural components of the magnet assembly of the present utility model;

FIG. 4 is a view showing the structural composition of the travel sensor of the present utility model;

FIG. 5 is a transverse cross-sectional view of the pedal travel simulation mechanism of the present utility model;

FIG. 6 is an exploded view of the structure of the pedal travel simulation mechanism of the present utility model;

FIG. 7 is a structural view of the magnet assembly of the present utility model mounted on a booster cap;

FIG. 8 is a schematic diagram of the pedal travel of the present utility model simulating different pedal travel.

The names of the parts indicated by the numerical reference numerals in the above drawings are as follows: wherein, 1, a stroke sensor; 11. a sensor housing; 111. a second mounting groove; 112. a lug; 113. a limit protrusion; 12. a circuit board; 2. a booster cover; 21. a guide part; 211. a guide lumen; 212. an opening; 22. a limit groove; 221. a limiting hole; 222. a bolt; 3. a push rod assembly; 31. an input lever; 32. an output lever; 321. a convex column; 33. u-shaped fork; 4. a magnet assembly; 41. a mounting shell; 411. a mounting groove; 42. an upper cover; 43. a slide block; 431. an elastic rubber; 44. a magnet; 45. a limit retainer ring; 5. and a seal.

Detailed Description

The present utility model will be described in further detail with reference to the accompanying drawings and examples.

Example 1

A pedal travel simulation mechanism for brake-by-wire is installed in a brake-by-wire booster assembly, the installation position of which is shown in FIG. 1, and the structure of the booster is common knowledge of those skilled in the art and is not explained herein. The pedal stroke simulation mechanism comprises a push rod assembly 3, a magnet assembly 4, a booster cover body 2 and a stroke sensor 1, wherein the push rod assembly 3 is used for being connected with a pedal and axially transmitting pedal displacement. The magnet assembly 4 is mounted on the push rod assembly 3, and the magnet assembly 4 includes a magnet 44.

As shown in fig. 1 and 2, a limiting groove 22 is formed in the surface of the booster cover 2, a limiting hole 221 is formed in the side groove wall of the limiting groove 22, and the corner of the sensor housing 11 is matched with the limiting groove 22 in shape. The side walls of the limiting groove 22 are provided with limiting holes 221, the part of the sensor housing 11, which is not provided with the circuit board 12, is provided with lugs 112 on the left and right sides, and the lugs 112 are fixed with the limiting holes 221 through bolts 222.

As shown in fig. 3, the magnet assembly 4 includes a mounting case 41, a first mounting groove 411 is provided in the mounting case 41, the magnet 44 is fitted in the first mounting groove 411 and is covered by an upper cover 42, and a plurality of sliders 43 are circumferentially arranged on a side of the mounting case 41 away from the first mounting groove 411. The installation shell 41 is the column, and the lateral surface of installation shell 41 comprises the arc surface of one side and the plane of opposite side, and first mounting groove 411 sets up in plane department, and the arc surface is provided with the draw-in groove that is used for holding slider 43, and slider 43 circumference evenly sets up in the draw-in groove of arc surface, and the inboard cladding of slider 43 has elastic rubber 431. The outer surface of the slider 43 is a smooth surface, and grease can be further applied to the surface to smooth the sliding of the slider 43 in the booster cover 2.

As shown in fig. 4, the stroke sensor 1 includes a sensor housing 11 and a circuit board 12 for sensing displacement of the magnet 44, the sensor housing 11 is fixedly mounted on the booster cover 2, and the circuit board 12 is attached to the opening 212 of the guide portion 21 opposite to the guide cavity 211.

As shown in fig. 4 and 5, the outer edge of the bottom surface of the sensor housing 11 on one side of the booster cover 2 is provided with a limit protrusion 113, the space between the limit protrusion 113 and the booster cover 2 is sealed by a sealing member 5, the sealing member 5 can be a sealing ring, a sealant or other components capable of being deformed adaptively according to the shape of the gap, and the gap is filled between the sensor housing 11 and the booster cover 2, so that the sensor housing 11 is completely attached to the outside of the booster cover 2.

As shown in fig. 6, the push rod assembly 3 includes a U-shaped fork 33, an input rod 31 and an output rod 32, the input rod 31 is movably riveted with the output rod 32 and axially fixed relatively, one end of the U-shaped fork 33 is used for being connected with a pedal, the other end of the U-shaped fork 33 is fixedly connected with the input rod 31, and the input rod 31 and the output rod 32 are used for transmitting the input force of the pedal and can synchronously axially move. The input rod 31 and the output rod 32 are assembled by a riveting process, and the input rod 31 can swing around the riveting position within a certain angle. The output rod 32 is provided with a convex column 321 for installing the magnet assembly 4 on one side close to the input rod 31, and the magnet assembly 4 is fixed on the convex column 321 and is axially limited by a limiting retainer ring 45. The stroke sensor 1 has an L-shape, the housing 11 is provided with a second mounting groove 111 on the side opposite to the magnet assembly 4, the circuit board 12 is provided in the second mounting groove 111, the magnet 44 has a block shape, and when the magnet 44 is mounted in the first mounting groove 411, the outer side surface thereof is parallel to the circuit board 12.

As shown in fig. 7, the booster cover 2 is used for covering the booster, the booster cover 2 includes a guide portion 21, the guide portion 21 has a guide inner cavity 211 axially arranged along the push rod assembly, an opening 212 communicating with the outside is provided on a side cavity wall of the guide inner cavity 211, the magnet assembly 4 is slidably provided in the guide inner cavity 211, and the magnet 44 is exposed outside the booster cover 2 through the opening 212.

Working principle: when the driver steps on the brake pedal for a certain distance, the U-shaped fork 33 connected with the brake pedal drives the input rod 31 and the output rod 32 to move forward for a corresponding distance, and the moving distance of the U-shaped fork is generally in a certain proportion to the forward moving distance of the input rod 31 and the output rod 32, and the proportion is determined by the pedal lever ratio. As shown in fig. 8, when the brake pedal is not depressed, is in the process of being depressed and is fully depressed theoretically, the push rod assembly 3 carries the displacement process of the magnet assembly 4 relative to the stroke sensor 1, at this time, the stroke sensor 1 generates the change of the magnetic field intensity by the magnet 44 received by the chip arranged on the circuit board 12, the depressed distance of the brake pedal is judged, a signal is sent to a vehicle electric system in the brake-by-wire booster, and a controller in the vehicle electric system drives the booster to act until the corresponding executing mechanism completes the braking of the vehicle, so as to achieve the purpose of braking.

In the description of the present utility model, it should be understood that the terms "center," "length," "width," "thickness," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In summary, the foregoing description is only of the preferred embodiments of the present utility model, and all equivalent changes and modifications made in accordance with the claims should be construed to fall within the scope of the utility model.

Claims (9)

1. A pedal travel simulation mechanism for brake-by-wire, comprising:

the push rod assembly (3), the push rod assembly (3) is used for connecting with the pedal and transmitting the displacement of the pedal axially;

a magnet assembly (4), wherein the magnet assembly (4) is arranged on the push rod assembly (3), and the magnet assembly (4) comprises a magnet (44);

the booster cover body (2) is used for sealing the booster, the booster cover body (2) comprises a guide part (21), the guide part (21) is provided with a guide inner cavity (211) axially arranged along the push rod assembly (3), an opening (212) communicated with the outside is formed in the side cavity wall of the guide inner cavity (211), the magnet assembly (4) is slidably arranged in the guide inner cavity (211), and the magnet (44) is exposed out of the booster cover body (2) through the opening (212);

the travel sensor (1) comprises a sensor shell (11) and a circuit board (12) for sensing the displacement of a magnet (44), wherein the sensor shell (11) is fixedly arranged on a booster cover body (2), and the circuit board (12) is attached to an opening (212) of a guide part (21) opposite to a guide inner cavity (211).

2. A pedal travel simulation mechanism for brake-by-wire according to claim 1, wherein: the magnet assembly (4) comprises a mounting shell (41), a first mounting groove (411) is formed in the mounting shell (41), the magnet (44) is embedded in the first mounting groove (411) and is sealed by an upper cover (42), and a plurality of sliding blocks (43) are circumferentially arranged on one side, far away from the first mounting groove (411), of the mounting shell (41).

3. A pedal travel simulation mechanism for brake-by-wire according to claim 2, wherein: the installation shell (41) is the column, and the lateral surface of installation shell (41) comprises the arc surface of one side and the plane of opposite side, and first mounting groove (411) set up in plane department, and the arc surface is provided with the draw-in groove that is used for holding slider (43), and slider (43) circumference evenly sets up in the draw-in groove of arc surface, and the inboard cladding of slider (43) has elastic rubber (431).

4. A pedal travel simulation mechanism for brake-by-wire according to claim 1, wherein: the push rod assembly (3) comprises a U-shaped fork (33), an input rod (31) and an output rod (32), wherein the input rod (31) is movably riveted with the output rod (32) and axially and relatively fixed, one end of the U-shaped fork (33) is used for being connected with a pedal, the other end of the U-shaped fork (33) is fixedly connected with the input rod (31), and the input rod (31) and the output rod (32) are used for transmitting input force of the pedal and can synchronously and axially move.

5. A pedal travel simulation mechanism for brake-by-wire according to claim 4, wherein: the output rod (32) is provided with a convex column (321) which is used for installing the magnet assembly (4) on one side close to the input rod (31), and the magnet assembly (4) is fixed on the convex column (321) and is axially limited through a limiting retainer ring (45).

6. A pedal travel simulation mechanism for brake-by-wire according to claim 1, wherein: the stroke sensor (1) is L-shaped, a second mounting groove (111) is formed in one side, opposite to the magnet assembly (4), of the sensor shell (11), the circuit board (12) is arranged in the second mounting groove (111), the magnet (44) is in a block shape, and when the magnet (44) is arranged in the first mounting groove (411), the outer side surface of the magnet is parallel to the circuit board (12).

7. A pedal travel simulation mechanism for brake-by-wire according to claim 6, wherein: limiting grooves (22) are formed in the surface of the booster cover body (2), and the corner of the sensor shell (11) is matched with the limiting grooves (22) in shape.

8. A pedal travel simulation mechanism for brake-by-wire according to claim 7, wherein: the side groove wall of the limiting groove (22) is provided with a limiting hole (221), the part of the sensor shell (11) which is not provided with the circuit board (12) is provided with lugs (112) on the left side and the right side, and the lugs (112) are fixed with the limiting hole (221) through bolts (222).

9. A pedal travel simulation mechanism for brake-by-wire according to claim 7, wherein: the sensor shell (11) is provided with a limit bulge (113) at the outer edge of the bottom surface at one side of the booster cover body (2), and the limit bulge (113) is sealed with the booster cover body (2) through a sealing piece (5).