Brake master cylinder with front chamber failure protection mode with proportional valve

Abstract

The application provides a brake master cylinder with a front cavity failure protection mode and a proportional valve, which is provided with a first piston assembly and a second piston assembly in sequence in a cylinder cavity, and is divided into a brake cavity I and a brake cavity II, and is provided with a proportional valve with a valve core and a valve seat on a side wall of the cylinder body, and the proportional valve is communicated with the brake cavity I. The second piston assembly is fixedly provided with a limiting sleeve with a collision part, the valve seat extends a collision rod which extends into the brake cavity I, and the valve seat is gap-fitted with the limiting ring and can be inclined and displaced. In normal braking, the valve seat seals the valve core channel, and the proportional valve is normally pressure-regulated; when the brake cavity II fails, the second piston assembly moves to the bottom of the cylinder, the collision part of the limiting sleeve hits the collision rod, the valve seat is inclined and separated from the seal, the valve core channel is penetrated, and the proportional valve is kept open. The application adopts a pure mechanical triggering structure and does not need an electric control component, can cancel the pressure-regulating loss of the proportional valve when the front cavity fails, maximally releases the brake pressure of the brake cavity I, effectively makes up for the insufficient brake pressure, and shortens the braking distance.

Description

Technical Field

[0001] This invention relates to the field of vehicle braking technology, and more specifically to a brake master cylinder with a front chamber failure protection mode and a proportional valve. Background Technology

[0002] In the prior art, a brake master cylinder with a proportional valve is disclosed in patent CN 201777234U.

[0003] Existing brake master cylinders with proportional valves (such as...) Figure 1 When the driver is driving, during normal or emergency braking, the proportional valve is in normal working order, meaning the car maintains smooth braking.

[0004] However, when the braking in the front chamber of the master cylinder fails, the proportional valve still distributes the braking pressure normally, thereby extending the braking distance and increasing the risk of accidents. Summary of the Invention

[0005] In response to the problems mentioned in the background art, the present invention proposes a brake master cylinder with a front chamber failure protection mode and a proportional valve to solve the above-mentioned technical problems, shorten the vehicle braking distance, and reduce the risk of accidents.

[0006] The technical solution of this invention is implemented as follows: A brake master cylinder with a proportional valve and a front chamber failure protection mode includes a cylinder body. A cavity extends through the left end of the cylinder body. From left to right, a first piston assembly and a second piston assembly are arranged within the cavity. A spring 1 is positioned between the second piston assembly and the bottom of the cavity, and a spring 2 is positioned between the first and second piston assemblies. A first brake chamber 1 is formed between the first and second piston assemblies, and a second brake chamber 2 is formed between the second piston assembly and the bottom of the cavity. An interface groove is provided on the side wall of the cylinder body. A connecting hole 1 communicating with the first brake chamber is provided at the bottom of the interface groove. A proportional valve is connected to the interface groove. A limit sleeve is connected to the second piston assembly, and a collision part is provided at the left end of the limit sleeve. When the second piston assembly moves to the right, the collision part collides with the proportional valve, causing the proportional valve to be in a normally open state.

[0007] The present invention is further configured such that the proportional valve includes a valve body, the front end of which is fixedly connected to the interface groove; The valve body is provided with connecting groove 1, connecting groove 2, and connecting groove 3 with gradually decreasing diameter from front to back. The valve body is provided with connecting groove 4 at the rear end. The valve body is provided with connecting hole 2 that connects connecting groove 3 and connecting groove 4. A cylindrical valve core is connected within connecting grooves one, two, and three. The valve core has a channel running through its front and rear ends. A sealing ring is provided between the rear end of the valve core and connecting groove three. An abutment ring is located in the middle of the valve core, abutting against the rear side wall of connecting groove two. A limit ring is fitted into connecting groove one, sleeved on the front end of the valve core. A retaining ring is provided on the inner side wall of the front end of connecting groove one to prevent the limit ring from dislodging. A stepped portion is formed on the inner side wall of the limit ring, and a valve seat is connected inside the limit ring. The valve seat has a through hole connecting its front and rear sides. The rear end of the valve seat abuts against the stepped part. It also includes a spring three that applies a backward elastic force to the valve seat. The front end of the spring three abuts against the retaining ring, and the rear end of the spring three abuts against the valve seat. A spring four is provided between the limiting ring and the abutting ring. When the valve core moves forward, the rear end of the valve seat can seal the front end of the channel. The valve seat has a collision rod that passes through the connecting hole one and extends into the braking chamber one. When the second piston assembly moves to the right, the collision part collides with the collision rod of the proportional valve.

[0008] The present invention is further configured such that a sealing ring is provided between the limiting ring and the connecting groove, and a sealing ring is provided between the limiting ring and the front end of the valve core.

[0009] The present invention is further configured such that the limiting sleeve is tubular, the inner wall of the right end of the limiting sleeve is provided with an annular assembly part, the second piston assembly is provided with an assembly groove connected to the assembly part, and the outer wall of the left end of the limiting sleeve is provided with an annular collision part.

[0010] The present invention is further configured such that an annular pressure relief groove is provided on the outer side wall of the valve body, and a pressure relief hole communicating with the connecting groove is provided at the bottom of the pressure relief groove, and a sealing ring is connected inside the pressure relief groove.

[0011] The present invention is further configured such that a groove is provided on the rear end face of the valve seat, and a raised sealing part is provided at the bottom of the groove, and the front end of the valve core can extend into the groove to seal with the sealing part.

[0012] The present invention is further configured such that the valve seat and the limiting ring are in clearance fit.

[0013] The invention is further configured such that a retaining ring is provided on the inner wall of the left end of the cavity to restrict the first piston assembly from disengaging.

[0014] The present invention is further configured such that the side wall of the cylinder is provided with an oil inlet that communicates with brake chamber one and brake chamber two respectively.

[0015] The present invention is further configured such that the side wall of the cylinder is provided with oil outlet holes that communicate with brake chamber one and brake chamber two, respectively.

[0016] By adopting the above technical solution, the beneficial effects of the present invention are as follows: The innovation of the brake master cylinder with front chamber failure protection mode with proportional valve provided by the present invention is that a limiting sleeve is designed on the second piston assembly of the brake master cylinder.

[0017] When the driver brakes under normal circumstances while driving, the car maintains a smooth and safe braking motion.

[0018] When braking fails in the front chamber of the master cylinder (brake chamber two), the first piston assembly continues to move forward under the force of the pedal, causing the second piston assembly to move towards the bottom of the chamber to the cylinder bottom. Simultaneously, the limiting sleeve moves along with the second piston assembly. Due to the action of the limiting sleeve, the proportional valve remains in the normally open state, meaning the proportional valve function is disabled. At the same time, the vehicle can obtain maximum braking pressure within a short period. This shortens the vehicle's braking distance, reduces the risk of accidents, and improves the vehicle's safety performance under the same conditions. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the existing technology.

[0021] Figure 2 This is a schematic diagram of the structure of the present invention.

[0022] Figure 3 This is a schematic diagram of the proportional valve mounting structure of the present invention.

[0023] Figure 4 This is a schematic diagram of the valve seat structure of the present invention.

[0024] Figure 5 This is a schematic diagram of the proportional valve of the present invention.

[0025] The following are the labels in the attached drawings: Cylinder 1, Cavity 2, First Piston Assembly 3, Second Piston Assembly 4, Spring 1, Spring 2, Brake Chamber 1, Brake Chamber 2, Interface Groove 9, Limiting Sleeve 10, Collision Part 11, Valve Body 12, Connecting Groove 13, Connecting Groove 2 14, Connecting Groove 3 15, Connecting Groove 4 16, Connecting Hole 1 17, Connecting Hole 2 18, Valve Core 19, Channel 20, Abutment Ring 21, Limiting Ring 22, Retaining Ring 23, Step Part 24, Valve Seat 25, Through Hole 26, Spring 3 27, Spring 4 28, Collision Rod 29, Assembly Part 30, Assembly Groove 31, Pressure Relief Groove 32, Pressure Relief Hole 33, Sealing Ring 34, Groove 35, Sealing Part 36, Oil Inlet 37, Oil Outlet 38. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] For reference as follows Figures 1-5 The present invention will be described as follows: Example: A brake master cylinder with a proportional valve front chamber failure protection mode includes a cylinder body 1, and a cavity 2 is opened inside the cylinder body 1. The cavity 2 is a hollow structure that runs through the left end of the cylinder body 1 and is the installation cavity for all piston assemblies and elastic components, as well as the working cavity for the brake hydraulic medium.

[0028] Inside the cavity 2, the first piston assembly 3 and the second piston assembly 4 are sequentially assembled along the left and right axial directions. The two sets of piston assemblies can slide along the axial direction of the cavity 2 to realize the establishment and release of braking hydraulic pressure.

[0029] A retaining ring 23 is fixedly installed on the inner side wall of the left end of the cavity 2. The retaining ring 23 is a limiting structure, which limits the maximum leftward movement of the first piston assembly 3, prevents the first piston assembly 3 from coming out of the left end of the cavity 2, and ensures the overall structural assembly stability.

[0030] Each elastic component adopts a partitioned assembly structure: Spring 5 is installed between the second piston assembly 4 and the bottom inner wall of the cavity 2. Spring 5 provides a restoring force for the second piston assembly 4.

[0031] Spring 6 is installed between the first piston assembly 3 and the second piston assembly 4. Spring 6 provides elastic support and reset for the two piston assemblies, ensuring that the piston assemblies return to their initial positions after the brake is released.

[0032] Two sets of piston assemblies divide the interior of cavity 2 into two independent sealed braking chambers: The sealed space between the first piston assembly 3 and the second piston assembly 4 forms brake chamber 7. The sealed space between the second piston assembly 4 and the bottom inner wall of the cavity 2 forms brake chamber 8. Two sets of oil circuit interfaces are symmetrically opened on the side wall of the cylinder body 1, namely an oil inlet 37 and an oil outlet 38. One set of oil inlet 37 and oil outlet 38 is connected to brake chamber 7, and the other set of oil inlet 37 and oil outlet 38 is connected to brake chamber 8, so as to realize the hydraulic oil supply and braking pressure output of the two brake chambers respectively.

[0033] An interface groove 9 is provided on the outer side wall of the cylinder body 1. A connecting hole 17 is provided at the bottom of the interface groove 9. The connecting hole 17 penetrates the bottom wall of the groove and communicates with the inside of the brake chamber 7, so as to realize the hydraulic passage connection between the proportional valve and the brake chamber 7.

[0034] Interface groove 9 uses a threaded connection structure to fix the overall structure of the proportional valve, ensuring connection sealing and assembly reliability, and avoiding problems such as medium leakage and component loosening during hydraulic operation.

[0035] The main body of the proportional valve is valve body 12. Valve body 12 adopts a multi-stage stepped groove structure design that runs through the front and rear. Along the axial direction from front to back of valve body 12, connecting groove 13, connecting groove 2 14, and connecting groove 3 15 with progressively smaller diameters are opened in sequence. Connecting groove 4 16 is opened at the rear end of valve body 12.

[0036] Among them, connecting groove 13, connecting groove 2 14, connecting groove 3 15, connecting hole 2 18, and connecting groove 4 16 adopt a coaxiality integrated design to ensure the smoothness of the axial movement of the valve core 19 and the sealing accuracy.

[0037] A connecting hole 2 18 is opened inside the valve body 12. The two ends of the connecting hole 2 18 are respectively connected to the connecting groove 3 15 and the connecting groove 4 16, forming the hydraulic flow channel at the rear end of the proportional valve.

[0038] The connecting groove 13, connecting groove 2 14, and connecting groove 3 15 are equipped with a cylindrical valve core 19. The valve core 19 is a proportional valve control component. The valve core 19 has an axial channel 20 that runs through both the front and rear ends, serving as the hydraulic flow path for the proportional valve under normal conditions.

[0039] The valve core 19 has an integrally formed annular abutment ring 21 on the outer wall of the middle part. The outer diameter of the abutment ring 21 is equal to or slightly smaller than the inner diameter of the connecting groove 14. After assembly, the rear end face of the abutment ring 21 is rigidly abutted against the rear side wall of the connecting groove 14, thereby achieving axial positioning of the valve core 19 and limiting the maximum rearward movement of the valve core 19.

[0040] A sealing ring is installed between the rear end of the valve core 19 and the groove wall of the connecting groove 15 to achieve radial sealing between the rear end of the valve core 19 and the valve body 12, preventing hydraulic medium from leaking from this gap.

[0041] The connecting groove 13 is fitted with a limiting ring 22, which is sleeved and fixed on the outer side of the front end of the valve core 19 to achieve radial limiting and positioning of the front end of the valve core 19.

[0042] A retaining ring 23 is installed on the inner side wall of the front end of the connecting groove 13. The retaining ring 23 is a limiting and locking structure that can prevent the limiting ring 22 from coming out of the connecting groove 13 and ensure the assembly stability of the limiting ring 22.

[0043] The inner wall of the limiting ring 22 is integrally formed with a stepped portion 24. The valve seat 25 is assembled with the limiting ring 22 with a clearance fit. The rear edge of the valve seat 25 abuts against the stepped portion 24 to achieve rearward limiting and positioning of the valve seat 25. The valve seat 25 has a through hole 26 axially extending through the front and rear end faces for hydraulic medium flow.

[0044] The valve seat 25 has a groove 35 on its rear end face. The bottom of the groove 35 is integrally formed with a raised sealing part 36. The front end of the valve core 19 can enter the groove 35 and form a sealing fit with the sealing part 36 to realize the on / off control of the front end of the channel 20.

[0045] The proportional valve has two sets of elastic components inside, which respectively realize the reset function of valve seat 25 and valve core 19.

[0046] Spring 3 27 is assembled inside the limiting ring 22. The front end of spring 3 27 abuts against the rear end face of the retaining ring 23, and the rear end abuts against the front end face of the valve seat 25, continuously providing the valve seat 25 with a rearward elastic preload.

[0047] Spring 4 28 is assembled inside the connecting groove 2 14 and sleeved on the outside of the valve core 19. The front end of spring 4 28 abuts against the rear end face of the limiting ring 22 and the rear end abuts against the front end face of the abutment ring 21. Through elastic force, the valve core 19 is axially moved backward and reset, maintaining the normal assembly position of the valve core 19.

[0048] To ensure the overall sealing performance of the proportional valve, a multi-seal structure is designed: a sealing ring is installed between the outer wall of the limiting ring 22 and the groove wall of the connecting groove 13 to achieve radial external sealing; a sealing ring is installed between the inner wall of the limiting ring 22 and the outer wall of the front end of the valve core 19 to achieve internal radial sealing; and a sealing ring is installed between the rear end of the valve core 19 and the connecting groove 15 to form a rear-end sealing structure. This multi-seal structure can effectively prevent hydraulic oil leakage and ensure the stability of the braking hydraulic system.

[0049] The second piston assembly 4 has a fixedly mounted tubular limiting sleeve 10 on its outer side. The inner side wall of the right end of the limiting sleeve 10 has an integrally formed annular assembly part 30. The outer side wall of the second piston assembly 4 has a corresponding assembly groove 31. Through the snap-fit ​​cooperation between the assembly part 30 and the assembly groove 31, the limiting sleeve 10 and the second piston assembly 4 are fixedly connected, ensuring that the limiting sleeve 10 can move axially synchronously with the second piston assembly 4 without relative displacement.

[0050] The outer wall of the left end of the limiting sleeve 10 is integrally formed with an annular collision part 11. The collision part 11 is a failure protection trigger structure that can move to the right synchronously with the second piston assembly 4.

[0051] The valve seat 25 has an integrally formed extended collision rod 29 on the front side. The collision rod 29 passes through the connecting hole 17 on the cylinder body 1 and extends into the brake chamber 7. The outer diameter of the collision rod 29 is smaller than the inner diameter of the connecting hole 17, ensuring that the collision rod 29 can deflect or tilt within the connecting hole 17.

[0052] An annular pressure relief groove 32 is formed on the outer wall of the valve body 12, and a pressure relief hole 33 is formed at the bottom of the pressure relief groove 32. The pressure relief hole 33 penetrates the wall of the valve body 12 and communicates with the inside of the connecting groove 14. A sealing ring 34 is installed inside the pressure relief groove 32 to seal and protect the outer periphery of the pressure relief structure, and at the same time, it works with the pressure relief hole 33 to release and regulate excess pressure inside the valve body 12.

[0053] Under normal braking conditions, with no chamber failure in the master cylinder, the driver depresses the brake pedal, causing the first piston assembly 3 and the second piston assembly 4 to move smoothly axially. Brake chamber 1 7 and brake chamber 2 8 simultaneously establish stable braking hydraulic pressure. At this time, the second piston assembly 4 is within its normal working stroke range and does not move to the bottom limit position of chamber 2. The collision part 11 of the limiting sleeve 10 does not contact or collide with the collision rod 29 of the proportional valve.

[0054] When the proportional valve is in normal pressure regulating operation, it can adjust the brake hydraulic pressure in real time according to the braking conditions to match the normal braking needs of the vehicle and ensure smooth and safe braking.

[0055] The core innovative function of this device is the failure protection of brake chamber 2 (front chamber). When brake chamber 2 experiences sealing failure, hydraulic leakage, or other faults, it cannot establish effective braking pressure, and the conventional braking function fails. At this time, the driver continues to apply pedal braking force, and the first piston assembly 3 continues to move axially forward under the drive of the pedal force, thereby pushing the second piston assembly 4 to move continuously towards the bottom of the chamber 2 until the second piston assembly 4 abuts the bottom of the chamber 2, reaching its limit stroke position.

[0056] As the second piston assembly 4 moves to the right, the limiting sleeve 10 fixed to its outer side moves synchronously. The collision part 11 at the left end of the limiting sleeve 10 continuously approaches the collision rod 29, eventually resulting in a rigid collision and compression with the collision rod 29. Since the valve seat 25 and the limiting ring 22 have a clearance fit structure, the collision and compression force will drive the collision rod 29 to shift, simultaneously causing the valve seat 25 to tilt as a whole.

[0057] After the valve seat 25 is tilted, the sealing part 36 at its rear end can no longer form a sealing fit with the front end of the valve core 19, and can no longer block the front end of the channel 20 of the valve core 19. The channel 20 remains in a fully open state, the internal passage of the proportional valve is completely open, the pressure regulating function of the proportional valve fails, and it continues to be in a normally open working state.

[0058] In this state, the hydraulic medium inside brake chamber 7 can flow rapidly through the connecting hole 17 and the channel 20 through which the proportional valve is fully connected, without pressure regulation loss. The braking system can build up and output the maximum limit braking pressure in a short time, making up for the lack of braking pressure caused by the failure of brake chamber 8, effectively shortening the vehicle braking distance, reducing the risk of traffic accidents caused by brake failure, and greatly improving the fault tolerance and driving safety of the vehicle braking system.

[0059] This technical solution achieves a passive automatic protection function in case of failure of the front chamber of the brake master cylinder by adding a synchronously moving limiting sleeve 10 and a collision part 11 to the second piston assembly 4, combined with a tiltable triggerable valve seat 25 and a collision rod 29. The overall structure is based on the original brake master cylinder chamber and proportional valve structure integrated design, without the need for additional electronic control sensors, actuators and other components, resulting in high structural integration, low failure rate and fast response speed.

[0060] During normal braking, the device does not interfere with the original braking pressure regulation logic, ensuring the comfort and stability of conventional braking. When the front chamber brake fails, the proportional valve can be mechanically triggered to open, maximizing the release of braking pressure in brake chamber 7. This effectively compensates for the braking performance defects caused by single chamber failure, significantly improves the safety redundancy of the vehicle braking system, and adapts to the upgrade requirements of various passenger vehicle braking safety configurations.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A brake master cylinder with a proportional valve and a front chamber failure protection mode, comprising a cylinder body, a cavity extending through its left end within the cylinder body, a first piston assembly and a second piston assembly arranged from left to right within the cavity, a spring 1 arranged between the second piston assembly and the bottom of the cavity, a spring 2 arranged between the first piston assembly and the second piston assembly, forming a brake chamber 1 between the first piston assembly and the second piston assembly, and forming a brake chamber 2 between the second piston assembly and the bottom of the cavity, an interface groove provided on the side wall of the cylinder body, a communication hole 1 communicating with the brake chamber 1 at the bottom of the interface groove, and a proportional valve connected to the interface groove, characterized in that: The second piston assembly is connected to a limiting sleeve, and the left end of the limiting sleeve is provided with a collision part; when the second piston assembly moves to the right, the collision part can collide with the proportional valve, so that the proportional valve is in the normally open state.

2. The brake master cylinder with a front chamber failure protection mode according to claim 1, characterized in that: The proportional valve includes a valve body, the front end of which is fixedly connected to the interface groove. The valve body is provided with connecting groove 1, connecting groove 2, and connecting groove 3 with gradually decreasing diameter from front to back. The valve body is provided with connecting groove 4 at the rear end. The valve body is provided with connecting hole 2 that connects connecting groove 3 and connecting groove 4. A cylindrical valve core is connected within connecting grooves one, two, and three. The valve core has a channel running through its front and rear ends. A sealing ring is provided between the rear end of the valve core and connecting groove three. An abutment ring is located in the middle of the valve core, abutting against the rear side wall of connecting groove two. A limit ring is fitted into connecting groove one, sleeved on the front end of the valve core. A retaining ring is provided on the inner side wall of the front end of connecting groove one to prevent the limit ring from dislodging. A stepped portion is formed on the inner side wall of the limit ring, and a valve seat is connected inside the limit ring. The valve seat has a through hole connecting its front and rear sides. The rear end of the valve seat abuts against the stepped part. It also includes a spring three that applies a backward elastic force to the valve seat. The front end of the spring three abuts against the retaining ring, and the rear end of the spring three abuts against the valve seat. A spring four is provided between the limiting ring and the abutting ring. When the valve core moves forward, the rear end of the valve seat can seal the front end of the channel. The valve seat has a collision rod that passes through the connecting hole one and extends into the braking chamber one. When the second piston assembly moves to the right, the collision part collides with the collision rod of the proportional valve.

3. The brake master cylinder with a proportional valve front chamber failure protection mode according to claim 2, characterized in that: A sealing ring is provided between the limiting ring and the connecting groove, and a sealing ring is provided between the limiting ring and the front end of the valve core.

4. A brake master cylinder with a proportional valve and a front chamber failure protection mode according to claim 2, characterized in that: The limiting sleeve is tubular, with an annular assembly part on the inner wall of the right end of the limiting sleeve, an assembly groove connected to the assembly part on the second piston assembly, and an annular collision part on the outer wall of the left end of the limiting sleeve.

5. A brake master cylinder with a proportional valve and a front chamber failure protection mode according to claim 2, characterized in that: The valve body has an annular pressure relief groove on its outer side wall, and a pressure relief hole communicating with the connecting groove 2 is provided at the bottom of the pressure relief groove. A sealing ring is connected inside the pressure relief groove.

6. A brake master cylinder with a proportional valve and a front chamber failure protection mode according to claim 2, characterized in that: The valve seat has a groove on its rear end face, and a raised sealing part at the bottom of the groove. The front end of the valve core can extend into the groove and seal with the sealing part.

7. A brake master cylinder with a proportional valve and a front chamber failure protection mode according to claim 2, characterized in that: The valve seat and the limiting ring are fitted with a clearance.

8. A brake master cylinder with a proportional valve and a front chamber failure protection mode according to claim 1, characterized in that: The inner wall of the left end of the cavity is provided with a retaining ring to prevent the first piston assembly from dislodging.

9. A brake master cylinder with a proportional valve and a front chamber failure protection mode according to claim 1, characterized in that: The cylinder body has oil inlets on its side walls that communicate with brake chamber one and brake chamber two, respectively.

10. A brake master cylinder with a proportional valve and a front chamber failure protection mode according to claim 1, characterized in that: The cylinder body has oil outlet holes on its side wall that communicate with brake chamber one and brake chamber two, respectively.

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