CN218316661U - Brake master cylinder and vehicle - Google Patents

Abstract

The utility model belongs to the technical field of the brake master cylinder, a brake master cylinder and vehicle is disclosed, the brake master cylinder includes main cylinder casing, first piston, permanent magnet, hall sensor and first elastic component. The main cylinder shell is provided with a piston cavity; the first piston is arranged in the piston cavity in a sliding mode and is used for being in transmission connection with the brake pedal, and a mounting hole is formed in the first piston in the axial direction; the permanent magnet is fixedly installed in the installation hole, so that the first piston can drive the permanent magnet to move under the driving of the brake pedal. The Hall sensor is fixedly arranged on the master cylinder shell and used for detecting the magnetic flux change of the permanent magnet and judging the braking intention of a driver. The first elastic piece is used for driving the first piston to move towards the outside of the piston cavity, and when the first piston is displaced, the first elastic piece drives the first piston to reset. The permanent magnet is cylindrical and coaxial with the first piston, so that the magnetic induction lines are uniformly distributed along the axis, and when the first piston rotates along the axis, the positions and angles of the magnetic induction lines around the permanent magnet cannot be changed.

Description

Brake master cylinder and vehicle

Technical Field

The utility model relates to a brake master cylinder technical field especially relates to a brake master cylinder and vehicle.

Background

A brake master cylinder of a vehicle, in which a braking force is derived from a pedal force applied to a brake pedal by a driver and a vacuum degree of an intake manifold of an engine, converts a mechanical force applied to the brake pedal by the driver and a force of a vacuum booster into a brake oil pressure, is a power source of a service brake system.

At present, the prior art provides a braking mode using electric control, a permanent magnet is fixedly connected to the side surface of a piston through a connecting rod, a hall sensor is fixedly arranged on a main cylinder, a driver steps on a brake pedal to drive the piston to move, so that magnetic flux passing through the hall sensor changes, a signal is transmitted to a controller, and a braking instruction is sent to a braking element. However, the used permanent magnets are mostly strip magnets with rectangular sections, and are fixed on the side surfaces of the pistons, the magnetic induction lines of the permanent magnets are not uniformly distributed, and the permanent magnets are driven to displace by the rotation of the pistons along the axes in the use process, so that the magnetic induction lines of the permanent magnets change, the detection of the sensors on the magnetic flux change is influenced, and the detection result is abnormal. In order to limit the rotation of the piston and the permanent magnet, an anti-rotation device is often required to be arranged, for example, a sliding block arranged on the piston is matched with a sliding groove arranged on a shell of the master cylinder, but the structure of the master cylinder is extremely complex, and the processing, the manufacturing and the later maintenance are not facilitated.

Therefore, a brake master cylinder and a vehicle are needed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

According to the utility model discloses an aspect, the utility model provides a brake master cylinder makes magnetic induction line along axis evenly distributed, reduces hall sensor's measuring error.

In order to achieve the purpose, the utility model adopts the following technical proposal:

a brake master cylinder comprising:

a master cylinder housing provided with a piston cavity;

the first piston is arranged in the piston cavity in a sliding mode and is used for being in transmission connection with the brake pedal, and a mounting hole is formed in the first piston in the axial direction;

the permanent magnet is cylindrical and is fixedly arranged in the mounting hole, and the permanent magnet and the first piston are coaxial;

a hall sensor fixedly installed in the master cylinder housing for detecting a change in magnetic flux of the permanent magnet;

and the first elastic piece is used for driving the first piston to move towards the outside of the piston cavity.

Preferably, the hall sensor is cylindrical, and a center line of the hall sensor is perpendicular to an axis of the permanent magnet.

In a preferred embodiment of the master cylinder, the master cylinder housing has a mounting cavity therein, and the hall sensor is fixedly disposed in the mounting cavity.

The brake master cylinder further includes a second piston slidably disposed in the piston chamber, and a second elastic member having both ends connected to the first piston and the second piston, respectively, and both ends connected to the second piston and a bottom wall of the piston chamber, respectively.

In a preferred embodiment of the brake master cylinder, the first piston has a first receiving groove, the second piston has a second receiving groove, and both ends of the first elastic member are connected to a bottom wall of the first receiving groove and a bottom wall of the second receiving groove, respectively.

In a preferred embodiment of the brake master cylinder, a first spring seat is provided in the first accommodation groove, and the first elastic member is fitted to the first spring seat.

In a preferred embodiment of the brake master cylinder, a second spring seat is provided in the second housing groove, and the first elastic member is fitted over the second spring seat.

The brake master cylinder further comprises a connecting assembly, wherein the connecting assembly comprises an insert rod and a slot, the insert rod can be inserted into the slot in a sliding mode, one of the insert rod and the slot is located on the first spring seat, and the other of the insert rod and the slot is located on the second spring seat.

In a preferred embodiment of the brake master cylinder, the second piston further includes a third receiving groove, and both ends of the second elastic member are connected to a bottom wall of the third receiving groove and a bottom wall of the piston chamber, respectively.

According to another aspect of the present invention, there is provided a vehicle including the above-described master cylinder.

The utility model has the advantages that:

the first piston is arranged in a piston cavity of the main cylinder shell in a sliding mode, the permanent magnet is fixedly arranged in an installation hole of the first piston, the first piston can drive the permanent magnet to move under the driving of a brake pedal, the Hall sensor is arranged to detect the magnetic flux change of the permanent magnet, the displacement of the permanent magnet, namely the displacement of the first piston, can be obtained, the distance of the brake pedal stepped on by a driver is further detected, the braking intention of the driver is judged, and the brake can adopt different braking schemes. The permanent magnet sets up to cylindrical and with first piston coaxial line, because the line is felt to cylindrical magnet's magnetism evenly along the axis distribution to at the braking in-process, when first piston took place to rotate along the axis, the position and the angle of the line are felt to magnetism around the permanent magnet can not change, can effectively reduce hall sensor's measuring error, make things convenient for operating personnel to install first piston in the master cylinder casing simultaneously. The first elastic piece is arranged and used for driving the first piston to move towards the outside of the piston cavity, and the first piston can be reset under the driving of the first elastic piece after the first piston displaces.

Drawings

FIG. 1 is a schematic external view of a brake master cylinder according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of an embodiment of the present invention in which the master cylinder does not include a master cylinder housing portion;

FIG. 3 is a schematic cross-sectional view of a brake master cylinder according to an embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view of an embodiment of the present invention in which the brake master cylinder does not include a master cylinder housing and a Hall sensor portion;

fig. 5 is a schematic diagram illustrating a control principle of the brake master cylinder according to an embodiment of the present invention.

In the figure:

1. a master cylinder housing; 11. a piston cavity; 12. a mounting cavity;

2. a first piston; 21. mounting holes; 22. a first accommodating groove; 221. a first spring seat;

3. a permanent magnet;

4. a Hall sensor;

5. a controller;

61. a first elastic member; 62. a second elastic member;

7. a second piston; 71. a second accommodating groove; 711. a second spring seat; 72. a third accommodating groove;

8. a connection assembly; 81. a rod is inserted; 82. inserting slots; 821. and (4) flow guide holes.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected", "connected" and "fixed" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings, and are only for convenience of description and simplification of operation, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

In the currently disclosed brake master cylinder, a permanent magnet is fixedly connected to the side surface of a piston through a connecting rod, a Hall sensor is fixedly arranged on the master cylinder, a driver steps on a brake pedal to drive the piston to move, so that magnetic flux passing through the Hall sensor changes, a signal is transmitted to a controller, and a brake command is sent to a brake element. However, the permanent magnets are strip magnets with rectangular sections and are fixed on the side faces of the piston, magnetic induction lines of the permanent magnets are not distributed uniformly, and the piston can rotate along the axis in the using process to drive the permanent magnets to displace, so that the magnetic induction lines of the permanent magnets change, and the detection of the sensor on the change of magnetic flux is influenced.

In order to solve the above problem, the embodiment provides a brake master cylinder, can make magnetic induction line along axis evenly distributed, reduces hall sensor's measuring error, can be used to brake master cylinder technical field.

Fig. 1 is a schematic external view of a brake master cylinder according to an embodiment of the present invention; FIG. 2 is a schematic structural view of an embodiment of the present invention in which the master cylinder does not include a master cylinder housing portion; fig. 3 shows a schematic cross-sectional view of a brake master cylinder in an embodiment of the present invention. Referring to fig. 1 to 3, the master cylinder includes a master cylinder housing 1, a first piston 2, a permanent magnet 3, a hall sensor 4, and a first elastic member 61. Piston cavity 11 has been seted up to master cylinder casing 1, and first piston 2 slides and sets up in piston cavity 11 to seted up mounting hole 21 along the axial, first piston 2 is used for being connected with brake pedal transmission, makes first piston 2 can be driven by brake pedal and slide along piston cavity 11. In this embodiment, the piston cavity 11 has an opening, and the first piston 2 is disposed through the opening. The permanent magnet 3 is fixedly mounted in the mounting hole 21, in this embodiment, the permanent magnet 3 and the mounting hole 21 are fixedly connected by interference fit, and in other embodiments, the permanent magnet 3 and the mounting hole may also be fixedly connected by welding or the like, which is not limited thereto. The hall sensor 4 is fixedly mounted on the master cylinder housing 1, and is used for detecting the magnetic flux change of the permanent magnet 3, further obtaining the moving amount of the permanent magnet 3 relative to the hall sensor 4, namely the moving amount of the first piston 2 relative to the hall sensor 4, further detecting the distance of the driver stepping on the brake pedal, further judging the braking intention of the driver, and enabling the brake to adopt different braking schemes. The first elastic member 61 is used for driving the first piston 2 to move out of the piston cavity 11, so that when the first piston 2 is displaced, the first elastic member 61 can drive the first piston 2 to reset.

With continued reference to fig. 1-3, based on the above-described structure, the permanent magnet 3 is cylindrical and coaxial with the first piston 2. Because the magnetic induction line of cylindrical magnet distributes evenly along the axis to in braking process, when first piston 2 took place to rotate along the axis, the position and the angle of the magnetic induction line around permanent magnet 3 can not change, can effectively reduce hall sensor 4's measuring error, simultaneously owing to needn't consider first piston 2 and permanent magnet 3's installation angle, only need with first piston 2 slide set up in piston cavity 11 can, make things convenient for operating personnel to install first piston 2 in the master cylinder casing.

Fig. 5 is a schematic view illustrating a control principle of the master cylinder according to an embodiment of the present invention. Referring to fig. 1, 2, 3 and 5, the brake master cylinder further comprises a controller 5, the controller 5 is respectively in communication connection with the hall sensor 4 and the brake, and the specific control process is that the hall sensor 4 detects the magnetic flux change of the permanent magnet 3 and transmits data to the controller 5, the controller 5 obtains the displacement change of the permanent magnet 3 according to the data, and further obtains the distance of detecting the brake pedal stepping down of the driver, so as to judge the braking intention of the driver, judge the braking measures to be taken by the vehicle at the moment, and further generate an adjusting instruction to be sent to the brake. And the brake brakes the vehicle according to the regulating instruction.

With continued reference to fig. 1-3, the hall sensor 4 is cylindrical, and the center line is perpendicular to the axis of the permanent magnet 3, specifically, the hall sensing chip of the hall sensor 4 is perpendicular to the axis of the permanent magnet 3, so that the magnetic induction lines of the permanent magnet 3 passing through the hall sensor 4 are more uniform, and the detection precision is improved.

With continued reference to fig. 1 to 3, the master cylinder housing 1 has an installation cavity 12 therein, and the hall sensor 4 is fixedly disposed in the installation cavity 12, so that the hall sensor 4 is disposed in the master cylinder housing 1, and the hall sensor 4 is prevented from being damaged due to collision. Alternatively, the axis of the mounting cavity 12 is perpendicular to the axis of the piston cavity 11, so that the centerline of the hall sensor 4 is perpendicular to the axis of the permanent magnet 3.

With continued reference to fig. 1-3, the master cylinder further includes a second piston 7 and a second elastic member 62, the second piston 7 is slidably disposed in the piston cavity 11, two ends of the first elastic member 61 are respectively connected to the first piston 2 and the second piston 7, and two ends of the second elastic member 62 are respectively connected to the second piston 7 and a bottom wall of the piston cavity 11. Make the brake master cylinder of this embodiment possess traditional brake master cylinder's function simultaneously through above-mentioned structure, piston chamber 11 still has the oil-out that communicates with the stopper promptly, when the driver steps on brake pedal, brake pedal drives first piston 2 and slides towards the diapire of piston chamber 11, and then drives second piston 7 and slides towards the diapire of piston chamber 11, first elastic component 61 and the compression of second elastic component 62, thereby the hydraulic oil in the drive piston chamber 11 flows to the stopper along the oil-out, the stopper brakes the vehicle. When the driver releases the brake pedal, the first elastic member 61 and the second elastic member 62 respectively drive the first piston 2 and the second piston 7 to return to the original position.

Fig. 4 is a schematic cross-sectional view illustrating a brake master cylinder without a master cylinder housing and a hall sensor portion according to an embodiment of the present invention. Referring to fig. 3 to 4, the first piston 2 has a first receiving groove 22, the second piston 7 has a second receiving groove 71, and two ends of the first elastic element 61 are respectively connected to a bottom wall of the first receiving groove 22 and a bottom wall of the second receiving groove 71. One of the first receiving groove 22 and the second receiving groove 71 is configured to allow the first elastic member 61 to be at least partially located in the first receiving groove 22 and the second receiving groove 71, so as to reduce the probability that the first elastic member 61 is in direct contact with the cavity wall of the piston cavity 11 during the compression process. Further, the provision of the first accommodation groove 22 and the second accommodation groove 71 can reduce the amount of machining material of the first piston 2 and the second piston 7, and reduce the weight of the first piston 2 and the second piston 7. Alternatively, the mounting hole 21 and the first receiving groove 22 are located at both ends of the first piston 2, respectively, and are not communicated with each other.

With continued reference to fig. 3-4, similar to the above structure, the second piston 7 further has a third receiving groove 72, two ends of the second elastic element 62 are respectively connected to a bottom wall of the third receiving groove 72 and a bottom wall of the piston cavity 11, and the third receiving groove 72 and the second receiving groove 71 are respectively located at two ends of the second piston 7 and are not communicated. The second elastic member 62 is located at least partially in the third accommodation groove 72 while reducing the weight of the second piston 7, reducing the probability that the second elastic member 62 will come into direct contact with the wall of the piston chamber 11 during compression.

With reference to fig. 3 to 4, a first spring seat 221 is disposed in the first receiving groove 22, and the first elastic member 61 is sleeved on the first spring seat 221, so that the first spring seat 221 can guide the first elastic member 61.

With continued reference to fig. 3-4, similar to the above structure, a second spring seat 711 is disposed in the second receiving groove 71, and the first elastic element 61 is sleeved on the second spring seat 711, so that the second spring seat 711 can guide the first elastic element 61.

With continued reference to fig. 3-4, the connecting assembly 8 is further included, the connecting assembly 8 includes a rod 81 and a slot 82, the rod 81 can be slidably inserted into the slot 82, one of the rod 81 and the slot 82 is located on the first spring seat 221, and the other is located on the second spring seat 711. By providing the insertion rod 81 and the insertion groove 82, the first spring seat 221 and the second spring seat 711 are in sliding fit to jointly guide the first elastic member 61, and at the same time, the sliding fit between the first piston 2 and the second piston 7 relative to the piston cavity 11 is more stable. Optionally, a diversion hole 821 is formed in the insertion slot 82, the diversion hole 821 is communicated with the piston cavity 11 to facilitate the circulation between the hydraulic oil in the insertion slot 82 and the hydraulic oil in the piston cavity 11, in the process that the insertion rod 81 is inserted into the insertion slot 82, the hydraulic oil flows into the piston cavity 11 through the diversion hole 821 to reduce the resistance of the insertion rod 81 during insertion, and meanwhile, when the insertion rod 81 is pulled out from the insertion slot 82, the hydraulic oil in the piston cavity 11 flows into the insertion slot 82 to reduce the moving resistance of the insertion rod 81.

The working process and principle of the master cylinder in the present embodiment will be described in detail below with reference to fig. 1 to 5:

when a driver steps on the brake pedal, the brake pedal drives the first piston 2 to slide in the piston cavity 11, and then the permanent magnet 3 is driven to move, so that the magnetic flux of the permanent magnet 3 penetrating through the Hall sensor 4 changes. The hall sensor 4 detects a change in the magnetic flux of the permanent magnet 3 and transmits data to the controller 5. The controller 5 obtains the displacement change of the permanent magnet 3 according to the data, further obtains the distance for detecting the brake pedal stepping of the driver, thereby judging the braking intention of the driver, generating an adjusting instruction and sending the adjusting instruction to the brake. And the brake brakes the vehicle according to the regulating instruction.

The embodiment also provides a vehicle comprising the brake master cylinder. The magnetic induction lines of the permanent magnets 3 are uniformly distributed along the axial direction, so that the detection precision of the Hall sensor 4 is improved, and the controller 5 can accurately judge the braking intention of a driver to adopt different braking schemes.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, rearrangements and substitutions will now occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A brake master cylinder, comprising:

a main cylinder housing (1) provided with a piston cavity (11);

the first piston (2) is arranged in the piston cavity (11) in a sliding mode and is used for being in transmission connection with a brake pedal, and a mounting hole (21) is formed in the first piston (2) in the axial direction;

the permanent magnet (3) is cylindrical and is fixedly arranged in the mounting hole (21), and the permanent magnet (3) and the first piston (2) are coaxial;

the Hall sensor (4) is fixedly arranged on the master cylinder shell (1) and used for detecting the magnetic flux change of the permanent magnet (3);

a first elastic member (61) for driving the first piston (2) to move out of the piston cavity (11).

2. Master cylinder according to claim 1, characterized in that the Hall sensor (4) is cylindrical and the centre line is perpendicular to the axis of the permanent magnet (3).

3. Brake master cylinder according to claim 1, characterized in that the master cylinder housing (1) has a mounting cavity (12) inside, the hall sensor (4) being fixedly arranged in the mounting cavity (12).

4. A brake master cylinder according to any one of claims 1 to 3, further comprising a second piston (7) and a second elastic member (62), wherein the second piston (7) is slidably disposed in the piston chamber (11), two ends of the first elastic member (61) are respectively connected to the first piston (2) and the second piston (7), and two ends of the second elastic member (62) are respectively connected to the second piston (7) and a bottom wall of the piston chamber (11).

5. A brake master cylinder according to claim 4, wherein the first piston (2) has a first receiving groove (22), the second piston (7) has a second receiving groove (71), and both ends of the first elastic member (61) are connected to a bottom wall of the first receiving groove (22) and a bottom wall of the second receiving groove (71), respectively.

6. A brake master cylinder according to claim 5, wherein a first spring seat (221) is provided in the first receiving groove (22), and the first elastic member (61) is fitted over the first spring seat (221).

7. A master cylinder according to claim 6, wherein a second spring seat (711) is provided in the second receiving groove (71), and the first elastic member (61) is fitted around the second spring seat (711).

8. A brake master cylinder according to claim 7, further comprising a connecting member (8), wherein the connecting member (8) includes a rod (81) and a socket (82), the rod (81) is slidably inserted into the socket (82), and the rod (81) and the socket (82) are located on the first spring seat (221) and the second spring seat (711), respectively.

9. A master cylinder according to claim 4, wherein the second piston (7) further has a third receiving groove (72), and both ends of the second elastic member (62) are connected to a bottom wall of the third receiving groove (72) and a bottom wall of the piston chamber (11), respectively.

10. A vehicle characterized by comprising a master cylinder according to any one of claims 1 to 9.

Images