Position acquisition assembly, hydraulic brake master cylinder applying same and vehicle

Abstract

The utility model discloses a position acquisition subassembly and applying the hydraulic brake master cylinder and vehicle, including valve body, hydraulic power subassembly and position sensor, valve body has a plurality of along the first direction extending cavity, and the liquid inlet hole and liquid outlet hole of cavity intercommunication, hydraulic power subassembly includes piston subassembly and magnetic stripe subassembly, and the position sensor is equipped with the position sensor. The piston assembly is arranged in a first cavity of the valve body, at least one part of the piston assembly is in sliding connection with the inner side wall of the first cavity, the end of the magnetic strip assembly is connected with the piston assembly, and at least one part of the magnetic strip assembly is arranged in a second cavity above the first cavity and is driven by the piston assembly to slide in a reciprocating mode in the first direction. The position sensor is arranged in the cavity, close to the magnetic strip assembly, of the top of the valve body. The master cylinder solves the problems that in the prior art, a traditional master cylinder does not have a signal collecting function, the movement position of a piston assembly in the master cylinder cannot be judged, and then a corresponding hydraulic drive-by-wire brake system is low in response speed and poor in control precision.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic brake master cylinder technology, specifically relating to a position acquisition component and a hydraulic brake master cylinder and vehicle using the same. Background Technology

[0002] Hydraulic brake-by-wire systems are part of the automotive chassis system and are an important component of the vehicle's braking system. They provide braking pressure to the wheel cylinders, clamp the brake calipers, and achieve vehicle braking. They also adjust the wheel cylinder braking pressure in real time according to the vehicle's posture, allowing the vehicle to move stably according to the driver's intentions.

[0003] The hydraulic brake master cylinder is the pressure source in the hydraulic brake-by-wire system. It converts the mechanical power transmitted from the pedal into hydraulic pressure and throttles it inside the master cylinder to provide a pressure signal to the plunger assembly. When the plunger assembly fails, the hydraulic pressure generated by the master cylinder is directly input into the wheel cylinder, acting as a second line of defense.

[0004] Currently, the main problems with traditional hydraulic brake master cylinders are: traditional master cylinders do not have the function of collecting signals, cannot determine the movement position of the piston assembly inside the master cylinder, and cannot quickly adjust the braking pressure by collecting the signal of the driver pressing the brake pedal, resulting in a slow response speed and poor accuracy of the entire hydraulic brake-by-wire system. Utility Model Content

[0005] To address the shortcomings of the existing technology, this utility model provides a position acquisition structure and a hydraulic brake master cylinder and vehicle using the same.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] Firstly, a location acquisition component is provided, including:

[0008] The valve body has multiple cavities extending along a first direction and inlet and outlet ports communicating with the cavities.

[0009] A hydraulic power assembly, as a component that converts external mechanical force into hydraulic force, includes a piston assembly and a magnetic strip assembly. The piston assembly is disposed in a first cavity of the valve body, and at least a portion of the piston assembly is slidably connected to the inner wall of the first cavity. The end of the magnetic strip assembly is connected to the piston assembly, and at least a portion of the magnetic strip assembly is disposed in a second cavity above the first cavity and slides reciprocally along the first direction under the driving action of the piston assembly. The magnetic strip assembly is used to determine the positional change of the piston assembly.

[0010] A position sensor is disposed in the cavity at the top of the valve body near the magnetic strip assembly. The position sensor and the magnetic strip assembly together constitute a structure that converts the movement position of the piston assembly into a voltage signal and outputs it to an external controller.

[0011] Wherein, the first direction is the length direction of the valve body, and the direction perpendicular to the first direction is the second direction.

[0012] In some embodiments, the distance between the magnetic strip assembly and the position sensor in the second direction is 4 mm.

[0013] In some embodiments, the outer sidewall of the magnetic strip assembly is provided with a cylindrical protrusion with a radius of 3.2 mm, and the protrusion contacts the inner sidewall of the second cavity.

[0014] Secondly, a hydraulic brake master cylinder is provided, which, in addition to the aforementioned position acquisition component, also includes:

[0015] A protective cover is disposed at the right end of the valve body, and at least a portion of the hydraulic power assembly is disposed in the cavity between the valve body and the protective cover;

[0016] A pedal assembly, located at the right end of the piston assembly, is used to transmit external mechanical force; and

[0017] A bracket assembly is disposed on the right side of the protective cover, the bracket assembly having a side plate that is bolted to the valve body.

[0018] In some embodiments, the inner sidewall of the lower part of the protective cover is engraved with a groove with a radius of 1.5 mm and a depth of 0.5 mm, and the protective cover and the valve body are sealed together by foam adhesive disposed in the groove.

[0019] In some embodiments, a bolt countersunk hole with a diameter of 8.5 mm and a depth of 4.5 mm is provided below the groove, and the protective cover is fixed to the valve body by bolts in the bolt countersunk hole.

[0020] In some embodiments, two rubber rings are provided at the connection between the piston assembly and the pedal assembly.

[0021] Thirdly, a vehicle is provided, including the aforementioned hydraulic brake master cylinder.

[0022] The beneficial effects of this utility model are: the position acquisition structure of this utility model can effectively acquire the movement position of the piston assembly inside the hydraulic brake master cylinder, and can quickly adjust the braking pressure by collecting the signal of the driver pressing the brake pedal, thereby improving the response speed and accuracy of the entire hydraulic brake-by-wire system. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the hydraulic brake master cylinder provided in one embodiment of the present invention;

[0025] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0026] Figure 3 yes Figure 1 A magnified view of a section at point C;

[0027] Figure 4 yes Figure 1 A magnified view of a section at point B in the middle;

[0028] Figure 5 This is a schematic diagram of the structure of a position sensor provided in one embodiment of the present invention;

[0029] Figure 6 yes Figure 1 A magnified view of a section at point D;

[0030] Figure 7 yes Figure 1 A magnified view of a section at point E in the middle. Detailed Implementation

[0031] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0032] This invention provides a position acquisition component, a hydraulic brake master cylinder using the same, and a vehicle, solving the problems of traditional hydraulic brake master cylinders such as inability to acquire signals, slow response speed, and poor accuracy. This invention also provides a hydraulic brake master cylinder using the position acquisition component, and a vehicle using the hydraulic brake master cylinder.

[0033] like Figure 1 As shown, in one embodiment, the position acquisition component 10 includes a valve body 101, a hydraulic power component 102, and a position sensor 103. The length direction of the valve body 101 is a first direction X, and the direction perpendicular to the first direction X is a second direction Y.

[0034] The valve body 101 has a plurality of cavities extending along a first direction X, and inlet and outlet ports communicating with the cavities; in one embodiment, such as Figure 1As shown, the valve body 101 includes a first cavity 1015, a second cavity 1016, and a base 1011. The first cavity 1015 is located on the central axis of the valve body 101 and communicates with multiple inlet and outlet holes located at the bottom of the valve body 101. The second cavity 1016 is located above and parallel to the first cavity 1015 and is used to house the hydraulic power assembly 102. The base 1011 is located at the left end of the valve body 101 and is sealed to the valve body 101 through an O-ring seal 1012. The space formed by the base 1011, the first cavity 1015, and the second cavity 1016 is used to house the hydraulic power assembly 102. In one embodiment, as shown... Figure 2 As shown, the outer wall of the valve body 101 has a mounting hole for an O-ring 1012. The mounting hole has a chamfer with an inclination of 15° and a recess of 0.5mm. The chamfered corner has a rounded corner with a radius of 3mm to prevent the O-ring 1012 from being scratched by the corner during installation, thus making the O-ring 1012 easier to install. In one embodiment, as... Figure 3 As shown, two raised rings with a radius of 0.1 mm are provided on the contact surface between the base 1011 and the valve body 101 to achieve a sealing function and prevent oil leakage when the O-ring seal 1012 is damaged, serving as a second protective mechanism.

[0035] The hydraulic power assembly 102, as a component that converts external mechanical force into hydraulic force, includes a piston assembly 1021 and a magnetic strip assembly 1022. The piston assembly 1021 is disposed within the first cavity 1015 of the valve body 101, and at least a portion of the piston assembly 1021 is slidably connected to the inner wall of the first cavity 1015. The end of the magnetic strip assembly 1022 is connected to the piston assembly 1021, and at least a portion of the magnetic strip assembly 1022 is disposed within a second cavity 1016 above the first cavity 1015 and reciprocates along a first direction X under the driving action of the piston assembly 1021. The magnetic strip assembly 1022 is used to determine the positional change of the piston assembly 1021. In one embodiment, as shown... Figure 1 and Figure 3As shown, the hydraulic power assembly 102 includes a piston assembly 1021 and a magnetic strip assembly 1022. The piston assembly 1021 includes a first spring 1021a, a first sliding connection portion 1021b, a second spring 1021c, and a second sliding connection portion 1021d. The first sliding connection portion 1021b is an I-shaped component and is slidably connected to the first cavity 1015. The first spring 1021a is disposed between the base 1011 and the first sliding connection portion 1021b. A first cup 1013 and a second cup 1014 are fitted between the first sliding connection portion 1021b and the inner wall of the first cavity 1015 to ensure the sealing of the valve body 101 and prevent oil leakage. The second sliding connection portion 1021d is disposed on the right side of the first sliding connection portion 1021b and is connected to the first sliding connection portion 1021b through the second spring 1021c. An extension portion is provided at the right end of the second sliding connection portion 1021d for connecting external components. The magnetic strip assembly 1022 is disposed within the second cavity 1016 and its end is connected to the first sliding connection portion 1021b. Under the driving action of the first sliding connection portion 1021b, it reciprocates along the first direction X. In one embodiment, as... Figure 3 As shown, a cylindrical protrusion 1022a with a radius of 3.2 mm is provided on the outer side wall of the magnetic strip assembly 1022. The protrusion 1022a contacts the inner side wall of the second cavity 1016, which reduces the contact area between the magnetic strip assembly 1022 and the valve body 101. This ensures that the magnetic strip assembly 1022 will not shake randomly when it makes piston-like movements in the valve body 101, thus playing a stabilizing role. It also ensures the smoothness of the magnetic strip assembly 1022 when it makes piston-like movements in the valve body 101.

[0036] Position sensor 103 is disposed in the cavity at the top of valve body 101 near magnetic strip assembly 1022. Position sensor 103 and magnetic strip assembly 1022 together constitute a structure that converts the movement position of piston assembly 1021 into a voltage signal and outputs it to an external controller; in one embodiment, as... Figure 1 and Figure 4 As shown, the position sensor 103 is positioned directly above the magnetic strip assembly 1022 and within the cavity of the valve body 101. The position sensor 103 works in conjunction with the magnetic strip assembly 1022 to convert the movement distance of the piston assembly 1021 within the master cylinder into a voltage signal, which is then output to an external controller. In one embodiment, as... Figure 3 As shown, the distance between the magnetic strip assembly 1022 and the position sensor 103 in the second direction is 4mm. This distance is the optimal position for the position sensor 103 to collect the signal from the magnetic strip assembly 1022. If the distance is too close, the magnetic angle of the magnetic strip read by the sensor 103 will be too small, resulting in inaccurate position acquisition. If the distance is too far, the position sensor 103 will acquire a weak signal or no signal at all.

[0037] like Figure 1As shown, in one embodiment, a hydraulic brake master cylinder 20 is provided, which, in addition to the position acquisition component 10 described above, also includes a protective cover 201, a pedal assembly 202, and a bracket assembly 203.

[0038] A protective cover 201 is disposed at the right end of the valve body 101, and at least a portion of the hydraulic power assembly 102 is disposed within the cavity between the valve body 101 and the protective cover 201; in one embodiment, such as Figure 1 and Figure 6 As shown, a protective cover 201 is disposed at the right end of the valve body 101, and a hydraulic power assembly 102 is disposed within the cavity between the protective cover 201 and the valve body 101. The inner sidewall of the lower part of the protective cover 201 is engraved with a groove having a radius of 1.5 mm and a depth of 0.5 mm. Foam is used within the groove to ensure a sealed connection between the protective cover 201 and the end face of the valve body 101. In one embodiment, as... Figure 7 As shown, a bolt countersunk hole with a diameter of 8.5 mm and a depth of 4.5 mm is provided below the groove. The protective cover 201 is fixed to the valve body 101 by the fixing bolt 2011 in the bolt countersunk hole.

[0039] The pedal assembly 202 is disposed at the right end of the piston assembly 1021 for transmitting external mechanical force; in one embodiment, such as Figure 1 As shown, the pedal assembly includes a connecting rod 2021 and a pedal 2022. An extension of the piston assembly 1021 passes through a through hole on the right side wall of the protective cover 201 and is connected to the connecting rod 2021 via a connecting bolt 2023. The right end of the connecting rod 2021 is connected to the pedal 2022. A dust cover 204 is disposed between the protective cover 201 and the connecting rod 2021 to prevent dust and foreign objects from entering the protective cover 201. In one embodiment, the connecting bolt 2023 is a hexagonal thin nut. In another embodiment, two rubber rings are provided at the connection between the extension of the piston assembly 1021 and the connecting rod 2021 to prevent the piston assembly 1021 from being pushed obliquely into the valve body 101, thus preventing increased wear at the contact point between the valve body 101 and the piston assembly 1021, and to provide a guiding function.

[0040] The bracket assembly 203 is disposed on the right side of the protective cover 201, and the bracket assembly 203 has a side plate that is bolted to the valve body 101. In one embodiment, as... Figure 1 As shown, the bracket assembly 203 is located on the right side of the valve body 101. The side plate of the bracket assembly 203 is provided with mounting bolts 2031, which pass through the protective cover 201 to connect the bracket assembly 203 and the valve body 101.

[0041] In one embodiment, when the piston assembly 1021 is in the initial position, the hydraulic pressure in the hydraulic brake master cylinder 20 is in a balanced state, and the oil does not flow in any direction.

[0042] In one embodiment, when the pedal assembly 202 pushes the piston assembly 1021 to move in the opposite direction to the first direction X, the first spring 1021a and the second spring 1021c are in a compressed state, and the air pressure in the first cavity 1015 is in an increased state. At this time, the oil flows out through the first outlet hole S1 and the second outlet hole S2, and the first inlet hole P1 and the second inlet hole P2 are in a closed state.

[0043] In one embodiment, when the external force on the pedal assembly 202 is removed, the piston assembly 1021 moves along the first direction X, the first spring 1021a and the second spring 1021c are in the recovery state, and the air pressure in the first cavity 1015 is in the reduced state. At this time, the oil enters the first cavity 1015 through the first inlet hole P1 and the second inlet hole P2.

[0044] The position acquisition component 10 provided by this utility model integrates the magnetic strip assembly 1022 and the piston assembly 1021. At the same time, the magnetic strip assembly 1022 is placed above the piston assembly 1021, eliminating the need for contact with the oil and removing interference factors, making the signal acquisition more stable and improving the response speed and accuracy of the entire hydraulic wire-controlled brake system. The protective cover 201 and the bracket assembly 203 are each connected to the valve body 101 separately, avoiding the problem of having to disassemble the entire hydraulic brake master cylinder 20 for replacement in case of emergencies. At the same time, the entire structure is easy to assemble and has strong sealing properties.

[0045] The above description is merely a preferred embodiment of one or more embodiments of this specification and is not intended to limit the scope of one or more embodiments of this specification. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments of this specification should be included within the protection scope of one or more embodiments of this specification.

Claims

1. A location acquisition component, characterized in that, include: The valve body has multiple cavities extending along a first direction and inlet and outlet ports communicating with the cavities. A hydraulic power assembly, as a component that converts external mechanical force into hydraulic force, includes a piston assembly and a magnetic strip assembly. The piston assembly is disposed in a first cavity of the valve body, and at least a portion of the piston assembly is slidably connected to the inner wall of the first cavity. The end of the magnetic strip assembly is connected to the piston assembly, and at least a portion of the magnetic strip assembly is disposed in a second cavity above the first cavity and slides reciprocally along the first direction under the driving action of the piston assembly. The magnetic strip assembly is used to determine the positional change of the piston assembly. A position sensor is disposed in the cavity at the top of the valve body near the magnetic strip assembly. The position sensor and the magnetic strip assembly together constitute a structure that converts the movement position of the piston assembly into a voltage signal and outputs it to an external controller. Wherein, the first direction is the length direction of the valve body, and the direction perpendicular to the first direction is the second direction.

2. The location acquisition component according to claim 1, characterized in that, The distance between the magnetic strip assembly and the position sensor in the second direction is 4 mm.

3. The location acquisition component according to claim 1, characterized in that, The outer wall of the magnetic strip assembly has a cylindrical protrusion with a radius of 3.2 mm, which contacts the inner wall of the second cavity.

4. A hydraulic brake master cylinder, characterized in that, In addition to the location acquisition component described in claim 1, it also includes: A protective cover is disposed at the right end of the valve body, and at least a portion of the hydraulic power assembly is disposed in the cavity between the valve body and the protective cover; A pedal assembly, located at the right end of the piston assembly, is used to transmit external mechanical force; and A bracket assembly is disposed on the right side of the protective cover, the bracket assembly having a side plate that is bolted to the valve body.

5. The hydraulic brake master cylinder according to claim 4, characterized in that, The inner wall of the lower part of the protective cover is engraved with a groove with a radius of 1.5 mm and a depth of 0.5 mm. The protective cover and the valve body are sealed together by foam adhesive provided in the groove.

6. The hydraulic brake master cylinder according to claim 5, characterized in that, Below the groove is a bolt countersunk hole with a diameter of 8.5 mm and a depth of 4.5 mm. The protective cover is fixed to the valve body by bolts in the bolt countersunk hole.

7. The hydraulic brake master cylinder according to claim 4, characterized in that, Two rubber rings are provided at the connection between the piston assembly and the pedal assembly.

8. A vehicle, characterized in that, Includes the hydraulic brake master cylinder as described in any one of claims 4-7.

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