Hydraulic brake system with facilitated venting

Abstract

This utility model provides a hydraulic braking system for easy venting. The system includes a master cylinder, a pedal push rod, a pedal simulator, an oil reservoir, and a hydraulic circuit. The pedal simulator is fixedly mounted on the housing of the master cylinder. One end of the pedal push rod extends into the pedal simulator and acts on its internal piston. The pedal simulator has a front sealing cavity and a rear sealing cavity. The front sealing cavity communicates with the first sealing cavity of the master cylinder, and the rear sealing cavity communicates with the oil reservoir. The mounting hole of the pedal simulator has a rounded corner structure. This hydraulic braking system, by providing a rounded corner structure at the mounting hole of the pedal simulator, optimizes the flow channel arrangement, ensures uniform force on the simulator, prevents uneven wear that could lead to simulator jamming or leakage, ensures smooth venting, improves venting effect, maintains stable pressure, and optimizes product performance.

Description

Technical Field

[0001] This utility model relates to the field of automotive braking system technology, and more specifically, to a hydraulic braking system that facilitates air release. Background Technology

[0002] The braking system is a crucial guarantee for vehicle driving safety. Compared to traditional braking systems, brake-by-wire systems eliminate the vacuum booster, offering advantages such as simple structure, fast braking response, and high control precision. Braking force is coordinated and controlled through hydraulic braking force and regenerative braking force, meeting the regenerative braking system requirements of electric and hybrid vehicles, and showing great development potential. Brake-by-wire systems can decouple the brake pedal from the brake wheel cylinders, but require specific devices to simulate the feel of the brake pedal to ensure that braking feedback information is transmitted to the driver. The pedal simulator, as a key component, needs to realistically simulate the characteristics of a traditional brake pedal, because drivers have developed a habit of using this type of vacuum-assisted brake pedal through long-term braking operations.

[0003] Currently, brake master cylinders typically have a first sealing chamber and a second sealing chamber. The brake pedal push rod is connected to the brake master cylinder, and a displacement simulator is mounted on the pedal push rod. The simulator's sealing structure has a front sealing chamber and a rear sealing chamber. The front sealing chamber is connected to the first sealing chamber, and the rear sealing chamber is connected to the oil reservoir. In the brake hydraulic system, gas venting is essential for ensuring system pressure build-up. In existing simulator venting schemes, uneven force on the simulator can easily cause uneven wear, leading to simulator jamming or leakage. Simultaneously, obstructed simulator venting can cause air retention, resulting in unstable product pressure holding and affecting braking performance and safety.

[0004] Therefore, there is an urgent need for a hydraulic braking system that optimizes the exhaust structure and prevents uneven wear on the simulator. Summary of the Invention

[0005] This application provides a hydraulic braking system that facilitates venting, aiming to solve the problems of uneven wear, jamming, and leakage caused by uneven force on the simulator in existing hydraulic braking systems, as well as the problem of unstable pressure holding caused by poor venting, thereby significantly improving the system's venting efficiency and reliability.

[0006] To address the aforementioned technical problems, this application provides a hydraulic braking system that facilitates venting. The hydraulic braking system includes: a master cylinder, a pedal push rod, a pedal simulator, an oil reservoir, and a hydraulic circuit. The pedal simulator is fixedly mounted on the housing of the master cylinder. One end of the pedal push rod extends into the interior of the pedal simulator and acts on the internal piston of the pedal simulator. The pedal simulator has a front sealing cavity and a rear sealing cavity. The front sealing cavity communicates with the first sealing cavity of the master cylinder, and the rear sealing cavity communicates with the oil reservoir. The mounting hole of the pedal simulator has a rounded corner structure.

[0007] In some embodiments of this application, the pedal simulator is fixed to the housing of the brake master cylinder by means of bolts or threads.

[0008] In some embodiments of this application, the front sealing cavity is connected to the first sealing cavity of the brake master cylinder through an internal flow channel, and the internal flow channel is a casting or drilling flow channel machined inside the housing of the brake master cylinder.

[0009] In some embodiments of this application, the oil reservoir is fixed to the top of the brake master cylinder and connected to the compensation hole of the brake master cylinder and the rear sealing cavity of the pedal simulator through independent pipelines.

[0010] In some embodiments of this application, the rounded corner structure is located in the mounting hole and is located at the cylinder inlet edge of the brake master cylinder that cooperates with the external piston of the pedal simulator.

[0011] In some embodiments of this application, the hydraulic braking system further includes a guide groove disposed at the bend of the flow channel.

[0012] In some embodiments of this application, the fluid path from the front sealing cavity of the pedal simulator to the highest point of the hydraulic circuit is arranged at an upward angle.

[0013] In some embodiments of this application, the piston surface of the pedal simulator is provided with an annular oil reservoir.

[0014] In some embodiments of this application, an automatic air release valve is provided at the highest point of the hydraulic circuit.

[0015] In some embodiments of this application, the pedal simulator adopts a split piston structure, including a main piston and an auxiliary piston for preferential exhaust during the low-pressure phase.

[0016] The beneficial effects of the embodiments of this application are as follows: By optimizing the simulator's mounting hole structure and flow channel arrangement, the simulator is subjected to uniform stress, effectively preventing uneven wear, jamming, and leakage, thus greatly improving the reliability and service life of the pedal simulator and the entire braking system. Furthermore, by incorporating rounded corners, guide grooves, and inclined exhaust channels, exhaust efficiency is significantly improved, gas residue is avoided, and system pressure holding stability is guaranteed. This application features a simple structure, is easy to manufacture and implement, and is applicable not only to new system designs but also to improvements to existing braking systems. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of a hydraulic braking system for easy exhaust provided in an embodiment of this application; Explanation of the attached diagram labels: 1 is the master cylinder, 2 is the pedal simulator, and 3 is the rounded corner structure. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0020] It should be noted that the terms "comprising" and "having," and any variations thereof, in the embodiments and accompanying drawings of this application are intended to cover non-exclusive inclusion. For example, it may include a series of structures, without being limited to the structures listed, but may optionally include structures not listed, or may optionally include other components inherent to these structures.

[0021] This application discloses a hydraulic braking system that facilitates air venting. Through integrated and optimized flow channel design, it provides a smooth and unobstructed path for the collection and discharge of air bubbles in the brake fluid, completely eliminating air resistance and improving the motion environment of the pedal simulator piston, preventing uneven wear, jamming, and seal failure caused by uneven force. Detailed descriptions follow.

[0022] Figure 1 A hydraulic braking system for facilitating venting is illustrated according to an embodiment of this application. For example... Figure 1As shown, the hydraulic braking system includes: a master cylinder 1, a pedal push rod, a pedal simulator 2, an oil reservoir, and a hydraulic circuit. The pedal simulator 2 is fixedly mounted on the housing of the master cylinder 1. One end of the pedal push rod extends into the interior of the pedal simulator 2 and acts on the internal piston of the pedal simulator 2, achieving decoupled pedal feel simulation. The pedal simulator 2 has a front sealing cavity and a rear sealing cavity. The front sealing cavity is connected to the first sealing cavity of the master cylinder 1, and the rear sealing cavity is connected to the oil reservoir through an independent pipeline, responsible for replenishing oil and providing a low-pressure exhaust path. A rounded corner structure 3 is provided at the mounting hole of the pedal simulator 2. At the mounting hole of the pedal simulator 2, i.e., at the cylinder inlet edge of the master cylinder that mates with the external piston of the pedal simulator 2, a smooth rounded corner is machined. This structure eliminates sharp edges, making the surrounding oil flow field more uniform when the piston moves in and out. This avoids hydraulic shock causing piston wear and also guides air bubbles to smoothly bypass the edge and move upward. The front sealing cavity is connected to the first sealing cavity of the master brake cylinder 1 via an internal flow channel. This internal flow channel is a cast or drilled channel machined inside the housing of the master brake cylinder 1. One end connects to the first sealing cavity of the master brake cylinder 1, and the other end directly connects to the interface for docking with the pedal simulator 2, seamlessly connecting with the front sealing cavity of the pedal simulator 2. The oil reservoir is fixed to the top of the master brake cylinder 1 and connected to the compensation hole of the master brake cylinder 1 and the rear sealing cavity of the pedal simulator 2 via independent pipelines.

[0023] In this application, at the mounting hole where the master cylinder 1 and the pedal simulator 2 are connected, the cylinder inlet edge 11 is machined into a smooth arc surface, i.e., the rounded corner structure, which ensures that when the piston of the pedal simulator 2 moves through, the oil flows smoothly, no eddies are generated, and the piston is subjected to uniform lateral force.

[0024] In some embodiments, the pedal simulator 2 is directly and rigidly fixed to the housing of the brake master cylinder 1 by means of bolt or thread connection, replacing the traditional external oil pipe.

[0025] In other embodiments, the rounded corner structure 3 is located in the mounting hole and is located at the cylinder inlet edge of the brake master cylinder 1 that cooperates with the external piston of the pedal simulator 2.

[0026] In other embodiments, the hydraulic braking system further includes a guide channel located at the bend in the flow path. The guide channel, located at the bend in the internal flow path (particularly the internal flow path or the flow path in the hydraulic circuit), changes the direction of the flow field, "sweeping" bubbles that may accumulate at the corner towards the main flow path and guiding them to converge at the exhaust point. Furthermore, the entire fluid path from the front sealing cavity of the pedal simulator 2 to the highest point of the hydraulic circuit is arranged at an upward slope. This structure utilizes the physical properties of low bubble density and natural upward floating to create a "natural" discharge channel for the bubbles.

[0027] In other embodiments, the piston surface of the pedal simulator 2 is provided with an annular oil reservoir. Furthermore, several annular oil reservoirs are provided on the piston surface of the pedal simulator 2. These annular oil reservoirs can store a small amount of brake fluid during piston movement, forming a lubricating film to reduce friction. Simultaneously, they can capture and carry micron-sized air bubbles, allowing them to move to a larger space with the piston before being released and floating upwards.

[0028] In other embodiments, an automatic vent valve is provided at the highest point of the hydraulic circuit. This automatic vent valve is the final outlet for system exhaust and can automatically detect and discharge the gas accumulated at the highest point.

[0029] In other embodiments, the pedal simulator 2 adopts a split piston structure, including a main piston and an auxiliary piston for priority exhaust during the low-pressure phase. The auxiliary piston and its associated spring have low stiffness and move preferentially during the initial braking phase (low-pressure phase), which can quickly push and exhaust the gas that may exist in this area, thus achieving "priority exhaust".

[0030] In summary, this application discloses a hydraulic braking system that facilitates venting. By directly fixing the pedal simulator to the brake master cylinder housing and connecting the two cavities through an internal flow channel, a high degree of integration is achieved. To optimize venting, a rounded corner structure is set at the simulator mounting hole inlet to avoid piston wear. A guide groove is set at the flow channel bend to guide air bubbles, making the fluid path tilted upward to utilize the buoyancy of the air bubbles. An annular oil reservoir is set on the piston surface to carry microbubbles. An automatic venting valve is set at the highest point of the hydraulic circuit as the final venting port. Structurally, this system fundamentally solves the problems of poor venting and simulator wear in hydraulic braking systems, significantly improving the braking performance and reliability of the system.

[0031] It will be understood by those skilled in the art that the accompanying drawings are merely schematic diagrams of one embodiment, and the components shown in the drawings are not necessarily essential for implementing this invention. It should also be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0032] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, in the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0033] Finally, it should be noted that the above-described embodiments are merely specific implementations of this utility model, used to illustrate the technical solution of this utility model, and not to limit it. The protection scope of this utility model is not limited thereto. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this utility model. These modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope described in the claims.

Claims

1. A hydraulic braking system that facilitates air release, characterized in that, The hydraulic braking system includes: a master cylinder, a pedal push rod, a pedal simulator, an oil reservoir, and a hydraulic circuit; the pedal simulator is fixedly mounted on the housing of the master cylinder, one end of the pedal push rod extends into the interior of the pedal simulator and acts on the internal piston of the pedal simulator; the pedal simulator has a front sealing cavity and a rear sealing cavity, the front sealing cavity is connected to the first sealing cavity of the master cylinder, the rear sealing cavity is connected to the oil reservoir, and the mounting hole of the pedal simulator is provided with a rounded corner structure.

2. The hydraulic braking system for easy venting according to claim 1, characterized in that, The pedal simulator is fixed to the housing of the brake master cylinder by means of bolt or thread connection.

3. The hydraulic braking system for easy venting according to claim 1, characterized in that, The front sealing cavity is connected to the first sealing cavity of the brake master cylinder through an internal flow channel, and the internal flow channel is a casting or drilling flow channel machined inside the housing of the brake master cylinder.

4. The hydraulic braking system for easy venting according to claim 1, characterized in that, The oil reservoir is fixed to the top of the master brake cylinder and is connected to the compensation hole of the master brake cylinder and the rear sealing cavity of the pedal simulator through independent pipelines.

5. The hydraulic braking system for easy venting according to claim 1, characterized in that, The rounded corner structure is located in the mounting hole and is located at the cylinder inlet edge of the brake master cylinder in conjunction with the external piston of the pedal simulator.

6. The hydraulic braking system for easy venting according to claim 1 or 5, characterized in that, The hydraulic braking system also includes a guide groove disposed at the bend of the flow channel.

7. The hydraulic braking system for easy venting according to claim 1, characterized in that, The fluid path from the front sealing cavity of the pedal simulator to the highest point of the hydraulic circuit is arranged at an upward angle.

8. The hydraulic braking system for easy venting according to claim 1, characterized in that, The piston surface of the pedal simulator is provided with an annular oil reservoir.

9. The hydraulic braking system for easy venting according to claim 1, characterized in that, An automatic air release valve is installed at the highest point of the hydraulic circuit.

10. The hydraulic braking system for easy venting according to claim 1, characterized in that, The pedal simulator adopts a split piston structure, including a main piston and an auxiliary piston for priority exhaust during the low-pressure stage.

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