A hydraulic brake valve and its exhaust process method

Abstract

The present invention discloses a hydraulic brake valve and its exhaust process method. The valve body of the exhaust structure touches and presses the operating mechanism at the top of the valve body component of the valve body. A working spring is installed on the valve plug of the valve body. The valve core is installed in the central hole of the valve body and the central counterbore of the plug. The valve core is inserted into the center of the plug, and the counterbore presses the return spring. The return spring is installed on the spring seat, and the spring seat is installed in the counterbore of the plug. The roller of the operating mechanism touches and presses the plug in the valve body to form action and reaction forces, and promotes the operating mechanism and the valve core to touch and press and move to work. The valve core can slide along the inner wall of the valve body. An exhaust hole is provided on the side wall of the valve core. A plug for blocking the other end of the valve body is provided in the valve body, and a spring seat abutting against the plug is further provided in the plug. A return spring is installed between the spring seat and the valve core. The advantages are: avoiding abnormal noises and cavitation phenomena caused by gas accumulation to the hydraulic brake valve, ensuring the normal transmission and circulation of hydraulic oil in the pipeline, and eliminating potential hazards of the hydraulic braking system.

Description

Technical Field

[0001] The present invention relates to the field of hydraulic braking systems, and in particular to a hydraulic brake valve and its exhaust process

[0002] Method. Background Art

[0003] The hydraulic braking system mainly consists of a hydraulic pump, a filling valve, an accumulator, a hydraulic brake valve, pipelines, brakes, etc. During operation, the hydraulic pump fills the accumulator with hydraulic oil. When the set pressure is reached, the filling valve stops filling the accumulator, and the hydraulic oil starts to supply oil to the hydraulic braking system. During braking, the accumulator supplies high-pressure hydraulic oil, which enters the brake after being decompressed by the hydraulic brake valve to achieve the braking of the whole machine. The hydraulic braking system relies on hydraulic oil to transmit power. Due to objective conditions, air is inevitably mixed in the hydraulic oil and suspended in the hydraulic oil in the form of spherical bubbles. When there are bubbles in the hydraulic oil, the flowing hydraulic oil becomes a gas-liquid two-phase flow, and its volume and elastic modulus decrease sharply, and its compressibility increases greatly. Therefore, the braking performance of the hydraulic braking system decreases, the control response is delayed, and it may cause the adverse consequence that the actuator shows a crawling phenomenon.

[0004] In addition, the bubbles in the hydraulic oil will also bring the following serious hazards to the entire hydraulic braking system:

[0005] 1. Generate abnormal noises and vibrations. When the hydraulic oil containing bubbles flows to a place with higher pressure, the bubbles are instantaneously broken and generate abnormal noises. At the same time, the collapse of a large number of bubbles will cause a large hydraulic fluctuation, resulting in the vibration of the hydraulic braking system.

[0006] 2. Cause cavitation damage to hydraulic braking components. When the bubbles collapse on the metal wall surface of the hydraulic braking components, the surrounding hydraulic oil will flow towards the collapse center at a very high speed, generating a great impact force on the wall surface. When a large number of bubbles collapse, the metal wall surface of the hydraulic braking components will be repeatedly subjected to severe impacts, causing fatigue damage, resulting in erosion and shedding, making the metal wall surface become rough, and even sponge-like small cavities. This erosion of the solid material surface by bubbles is called cavitation, which is one of the main reasons for the damage of hydraulic braking components.

[0007] 3. Cause deterioration of the hydraulic oil quality. When the hydraulic oil bubbles collapse, it is in an approximately adiabatic compression state, and local high temperatures will occur, damaging various additives in the oil, generating free carbon, acid esters, and gelatinous precipitates, accelerating the deterioration of the grease, and having a greater chemical corrosion effect on the hydraulic braking components.

[0008] Therefore, air bubble oil is a harmful phenomenon that is relatively easy to be overlooked in hydraulic braking systems and its occurrence must be avoided as much as possible. The hydraulic brake valve is the core component of the hydraulic braking system. The hydraulic oil flowing inside the hydraulic brake valve usually generates air bubbles, which causes abnormal noises and cavitation in the hydraulic brake valve. At present, there is no way on the market that can effectively discharge the gas inside the hydraulic brake valve. Therefore, it is necessary to develop a hydraulic brake valve that can automatically discharge the internal gas to eliminate the abnormal noise during braking of the hydraulic brake valve and improve the safety performance of vehicle driving. Comparative Document 1, Application No.: CN201310366110, Invention Title: A spool feedback piston hydraulic brake valve, comprising a valve body, a spool, a return spring, a balance spring, and a push rod; the valve body has an inlet, an outlet, a return port, and a spool cavity, and the inlet, outlet, and return port are respectively connected through the spool cavity. The spool is slidably connected in the spool cavity, and the push rod is movably connected to the upper end of the spool; a feedback channel is provided in the spool, and this feedback channel is connected between the outlet of the valve body and the bottom end of the spool cavity; the hydraulic brake valve further comprises a feedback piston, the upper part of which is accommodated in the feedback channel, and the bottom end surface of the feedback piston is in contact with the bottom surface of the spool cavity. Comparative Document 2, Application No.: CN201620817367, Invention Title: Hydraulic brake valve for wheeled construction vehicles, comprising a valve body and a spool; the valve body is composed of an upper valve body and a lower valve body; the spool is composed of an upper spool, a spring seat, a compression sleeve, a main spring lower spool, and a return spring; there are an upper oil inlet, an upper oil outlet, and an upper return port on the upper valve body, and an upper ring groove and an upper throttle oil hole on the upper spool; there are a lower oil inlet, a lower oil outlet, and a lower return port on the lower valve body, and a lower ring groove and a lower throttle oil hole on the lower spool. The characteristic structures of Comparative Documents 1 and 2 are different from those of this patent application. Summary of the Invention

[0009] The object of the present invention is to provide a hydraulic brake valve and its exhaust structure, which can smoothly discharge the gas mixed in the hydraulic oil in the inner cavity of the hydraulic brake valve, avoid abnormal noises and cavitation phenomena caused by gas accumulation, and eliminate potential hazards in the hydraulic braking system. This can prevent the multi-bubble in the hydraulic brake supplement from generating abnormal noise and vibration, eroding the surface of solid materials, causing cavitation damage to hydraulic brake components, and resulting in the deterioration of hydraulic components.

[0010] The technical solution adopted to achieve the above purpose is as follows: A hydraulic brake valve, comprising a control mechanism, a valve body component, a valve body, a fuel tank port, an oil inlet, an oil outlet, a valve core, a damping hole, an exhaust hole, a spring seat, a plug, a sealing ring, a return spring, a hydraulic chamber, a valve core feedback channel, a limit step, an equal-diameter hole body exhaust hole, a stepped hole body exhaust hole, a circular exhaust hole, an oblong exhaust hole, a square exhaust hole, an oval exhaust hole, a toothed exhaust hole, a working spring, a plug, a roller and a support shaft, characterized in that the valve body component 2 is installed on the valve body 21, a plug 9 is installed at the center of the valve body 21, a central hole of the plug 9 is installed, and the upper end of the plug 9 is located between the working spring 8 and the roller 10. The plug 9 presses the roller 10 of the control mechanism 1. The control mechanism 1 has a support shaft 11. The lower end of the plug 9 is installed to press the upper end of the valve core 3. The lower end of the valve core 3 passes through the valve body 21 and installs the upper end of the return spring 7 of the plug 5. The return spring 7 is installed on the spring seat 4 in the central counterbore of the plug 5, and the spring seat 4 is installed in the central counterbore of the plug 5.

[0011] The valve core 3 has a valve core feedback channel 33 and an exhaust hole 32. The valve core 3 has an equal-diameter hole body exhaust hole 321, a stepped hole body exhaust hole 322, a circular exhaust hole 323, an oblong exhaust hole 324, a square exhaust hole 325, an oval exhaust hole 326 and a toothed exhaust hole 327. The valve core 3 is in a cylindrical shape and has an exhaust hole 32. The exhaust hole 32 is provided on the side wall of one end of the valve core 3 and is separated from the oil inlet 23 of the valve body. The exhaust hole 32 is communicated with the valve core feedback channel 33 and the hydraulic chamber 25. The equal-diameter hole body exhaust hole 321, the stepped hole body exhaust hole 322, the circular exhaust hole 323, the oblong exhaust hole 324, the square exhaust hole 325, the oval exhaust hole 326 and the toothed exhaust hole 327 are arranged on the circumference of the valve core 3. One end of the plug 5 extends towards the valve core 3 to the limit step 26 of the valve body. The valve body 21 has a fuel tank port 22, an oil inlet 23 and an oil outlet 24, and there is more than one oil outlet 24.

[0012] The valve core 3 passes through the fuel tank port 22, the oil inlet 23 and the oil outlet 24, and the valve core 3 has a damping hole 31.

[0013] The control mechanism 1 has a roller 10, a support shaft 11 and a pedal.

[0014] The return spring 7 of the plug 5 presses the valve core 3. The valve core 3 presses the plug 9. The working spring 8 in the inner hole of the plug 9 presses the head of the plug 9. The plug 9 presses the roller 10. The roller 10 pushes the control mechanism 1 to work. The roller 10 of the control mechanism 1 touches and presses the plug 9 to move downward. The working spring 8 at the center of the plug 9 presses down the valve core 3. The valve core 3 presses down the return spring 7. The return spring 7 presses down the spring seat 4 and the plug 5.

[0015] The outer wall of the valve core 3 is sealed with the inner wall of the valve body 21 and slides along the inner wall of the valve core 3. There is a gap in the valve body 21 where the plug 5 is provided to prevent the air from the outside from penetrating into the hydraulic braking system. Inside the plug 5, there is a spring seat 4 that abuts against the plug to support and reset the spring 7. A return spring 7 is sleeved on the spring seat 4, with one end abutting against the step surface of the valve core 3 and the other end abutting against the spring seat 4. Under the action of the return spring 7, the sealing position between the outer wall of the valve core and the inner wall of the valve body 21 is located between the oil inlet 23 and the exhaust hole 32. Applying a driving force away from the spring seat 4 to the valve core 3, there is an exhaust hole 32 on one side wall of the valve core 3, which automatically discharges the gas in the valve body. The exhaust hole 32, the valve core feedback channel 33, and the hydraulic cavity 25 are connected. The gas in the hydraulic cavity is guided to flow out through the damping hole 31 from the valve core 3 and the feedback channel, so that the residual gas in the hydraulic cavity 25 is discharged from the fuel tank port 22, preventing abnormal noise from occurring in the hydraulic braking valve.

[0016] The advantages of the present invention compared with the prior art are as follows: It can smoothly discharge the gas mixed in the hydraulic oil in the inner cavity of the hydraulic braking valve, avoid abnormal noise and cavitation phenomena caused by gas accumulation, ensure the normal transmission and circulation of the hydraulic oil in the pipeline, and eliminate potential hazards in the hydraulic braking system. The design is novel, the structure is advanced and reasonable, it is easy to manufacture, convenient to install and use, energy-saving and consumption-saving, and safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the main front view assembly schematic diagram of the present invention.

[0018] Figure 2 is according to the present invention Figure 1 is the partial enlarged schematic diagram at A in the figure.

[0019] Figure 3 is the main front view schematic diagram of the valve core of the present invention.

[0020] Figure 4 is the partial schematic diagram of the exhaust hole of the exhaust structure of the present invention.

[0021] Figures 5 to 10 is Figure 4 is the partial schematic diagram of another implementation manner of the exhaust hole.

[0022] Reference numerals: operating handle 1, valve body component 2, valve body 21, fuel tank port 22, oil inlet 23, oil outlet 24, valve core 3, damping hole 31, exhaust hole 32, spring seat 4, plug 5, sealing ring 6, return spring 7, hydraulic cavity 25, valve core feedback channel 33, limit step 26, equal-diameter hole body exhaust hole 321, stepped hole body exhaust hole 322, circular exhaust hole 323, oblong exhaust hole 324, square exhaust hole 325, oval exhaust hole 326, toothed exhaust hole 327, working spring 8, plug 9, roller 10, support shaft 11. DETAILED DESCRIPTION OF THE INVENTION

[0023] The present invention will be further described below in conjunction with the accompanying drawings:

[0024] Example 1, reference Figure 1 As shown, a hydraulic brake valve comprises a valve core 3, a plug 5, a sealing ring 6, a return spring 7 and a spring seat 4. A valve body component 2 with an exhaust structure and an operating mechanism 1 located on the top of the valve body component 2, wherein the valve body component 2 has one or two independent oil outlets 24, and the operating mechanism 1 is a push rod, a handle or a pedal. The outer wall of the valve core 3 is sealed with the inner wall of the valve body 21 and can slide along the inner wall of the valve body 3. The valve body 21 is provided with a plug 5 and a sealing ring 6 for sealing the other end of the valve body 21. The sealing ring 6 can prevent the hydraulic oil from flowing out of the gap between the valve body 21 and the plug 5, and also prevent the outside air from penetrating into the hydraulic brake system. The plug 5 is also provided with a spring seat 4 for supporting and positioning the return spring 7, which is close to the plug 5. The spring seat 4 is provided with a return spring 7, one end of which is against the step surface of the valve core 3 and the other end of which is against the spring seat 4. The return spring 7 is against one end of the valve core 3 and under the action of the return spring 7, the seal between the outer wall of the valve core 3 and the inner wall of the valve body 21 is located between the oil inlet 23 and the exhaust hole 32, and can apply a thrust to the valve core to make the valve core away from the spring seat 4.

[0025] The valve core 3 is cylindrical and has an exhaust hole 32. The exhaust hole 32 is opened on the side wall of one end of the valve core 3 and is separated from the oil inlet 23 of the valve body. The side wall of one end of the valve core 3 is provided with an exhaust hole allowing gas to pass through. At this time, no human control is required, and the gas in the hydraulic brake valve can be automatically discharged to avoid various hazards caused by the presence of gas and eliminate hidden dangers of the system.

[0026] The exhaust hole 32 is directly connected with the valve core feedback channel 33 and the hydraulic chamber 25, which can guide the gas in the hydraulic chamber to flow out from the feedback channel of the valve core 3 through the damping hole 31, so that the generated bubbles are discharged from the oil return port, preventing them from accumulating at one end of the valve core 3 and causing abnormal noise in the hydraulic brake valve.

[0027] Reference Figures 4 to 5 As shown, the exhaust holes 32 are a plurality of circumferentially distributed exhaust holes 321 of equal diameter or stepped exhaust holes 322 .

[0028] Reference Figures 6 to 10 As shown, the exhaust hole 32 has a shape of a circular exhaust hole 323 , an oblong exhaust hole 324 , a square exhaust hole 325 , an elliptical exhaust hole 326 or a tooth-shaped exhaust hole 327 .

[0029] The structural shape and number of the exhaust holes can be obtained through a large number of tests and calculations, while taking into account the valve core structural strength and processing requirements.

[0030] One end of the plug 5 extends towards the spool 3 to the valve body limiting step 26. The plug 5 is fitted and pressed against the valve body step, which can reduce the gas residue area in the hydraulic chamber 25 at one end of the spool 3 and avoid abnormal noise generated by the hydraulic brake valve due to gas accumulation.

[0031] Refer to Figure 1 As shown, when the hydraulic brake valve brakes, the actuating mechanism 1 is executed, and the spool 3 moves towards the spring seat 4, causing the oil outlet 24 to be disconnected from the fuel tank port 22, and the oil inlet 23 to communicate with the oil outlet 24. Part of the hydraulic oil mixed with gas enters the brake through the valve body oil outlet 24 for braking, and part passes through the damping hole 31 on the spool 3 to reach the spool feedback channel 33 and the hydraulic chamber 25, generating a thrust force that moves the spool away from the spring seat 4 until the operating force and the thrust force are balanced. At this time, the hydraulic brake valve is in a balanced state, and the oil outlet 24 is disconnected from the fuel tank port 22 and the oil inlet 23. When the actuating mechanism 1 is released, each component returns to Figure 1 the state shown. The thrust force of the hydraulic oil on the spool 3 disappears, and the return spring 7 generates a thrust force on the spool 3, causing the spool to move towards the spring seat 4. At this time, the oil inlet 23 is disconnected from the oil outlet 24, and the oil outlet 24 communicates with the fuel tank port 22. The gas remaining in the hydraulic chamber 25 flows out through the exhaust hole 32 of the spool and the damping hole 31 along with the hydraulic oil, so that the generated bubbles are discharged from the fuel tank port 22 out of the hydraulic brake valve.

[0032] When the hydraulic brake valve is braked, any remaining gas, such as the gas in the hydraulic chamber, will be discharged through the exhaust structure. These gases will flow through the oil inlet 23, the oil outlet 24, the damping hole 31, the hydraulic chamber 25 and the fuel tank port 22, and finally flow back to the hydraulic brake system fuel tank. Obviously, these gases will not remain in the hydraulic chamber 25 at one end of the spool 3.

[0033] Embodiment 2, an exhaust structure of a hydraulic brake valve, the exhaust structure comprising: a valve core 3, a plug 5, a sealing ring 6, a return spring 7 and a spring seat 4. The outer side wall of the valve core 3 is sealed with the inner wall of the valve body 21 and can slide along the inner wall of the valve body 21. A plug 5 and a sealing ring 6 for blocking the other end of the valve body are provided in the valve body 21. The sealing ring 6 can prevent hydraulic oil from flowing out through the gap between the valve body 21 and the plug 5, and at the same time prevent external air from penetrating into the hydraulic braking system. A spring seat 4 for supporting and positioning the return spring 7 and abuting against the plug 5 is further provided in the plug 5. A return spring 7 with one end abuting against the step surface of the valve core 3 and the other end abuting against the spring seat 4 is sleeved on the spring seat 4. The return spring 7 abuts against one end of the valve core 3, and under the action of the return spring 7, the sealed portion between the outer side wall of the valve core 3 and the inner wall of the valve body 21 is located between the oil inlet 23 and the exhaust hole 32, and can apply a thrust to the valve core 3 in the direction away from the spring seat 4. The valve core 3 is cylindrical and has an exhaust hole 32, and the exhaust hole 32 is opened on the side wall of one end of the valve core and is separated from the oil inlet 23 of the valve body. The exhaust hole 32 is directly communicated with the feedback channel 33 of the valve core 3 and the hydraulic chamber 25, and can guide the gas in the hydraulic chamber to flow out through the damping hole 31 via the feedback channel of the valve core 3, so that the residual gas in the hydraulic chamber is discharged from the fuel tank port 22, preventing it from accumulating at one end of the valve core 3 and causing abnormal noise in the hydraulic brake valve.

[0034] Embodiment 3, referring to the drawings and referring to Embodiment 1, the present invention further provides a hydraulic brake valve, comprising a valve body component 2 having an exhaust structure and an operating mechanism 1 located at the top of the valve body component 2. The valve body component 2 has one or two independent oil outlets 24. The structure of the operating mechanism 1 is a push rod, a handle or a pedal, and is characterized in that the exhaust structure is the above structure.

Claims

1. A hydraulic brake valve, comprising a control mechanism, a valve body component, a valve body, an oil tank port, an oil inlet, an oil outlet, a valve core, a damping hole, an exhaust hole, a spring seat, a plug, a sealing ring, a return spring, a hydraulic chamber, a valve core feedback channel, a limiting step, an equal-diameter hole body exhaust hole, a stepped hole body exhaust hole, a circular exhaust hole, an oblong exhaust hole, a square exhaust hole, an oval exhaust hole, a toothed exhaust hole, a working spring, a plug, a roller and a support shaft, characterized in that: The valve body component (2) installs the valve body (21). A plug (9) is installed at the center of the valve body (21). The central hole of the plug (9) is installed at the upper end of the plug (9) between the working spring (8) and the roller (10). The plug (9) presses against the roller (10) of the operating mechanism (1). The operating mechanism (1) has a support shaft (11). The lower part of the plug (9) touches the upper end of the valve core (3). The lower end of the valve core (3) passes through the valve body (21) and installs the upper end of the return spring (7) of the plug (5). The return spring (7) is installed on the spring seat (4) in the central counterbore of the plug (5). The spring seat (4) is installed in the central counterbore of the plug (5). The valve core (3) has a valve core feedback channel (33) and an exhaust hole (32). The valve core (3) has an equal-diameter hole body exhaust hole (321), a stepped hole body exhaust hole (322), a circular exhaust hole (323), an oblong exhaust hole (324), a square exhaust hole (325), an oval exhaust hole (326), and a toothed exhaust hole (327). The valve core (3) is in a cylindrical shape and has an exhaust hole (32). The exhaust hole (32) is provided on the side wall of one end of the valve core (3) and is separated from the oil inlet (23) of the valve body. The exhaust hole (32) communicates with the valve core feedback channel (33) and the hydraulic chamber (25). The equal-diameter hole body exhaust hole (321), the stepped hole body exhaust hole (322), the circular exhaust hole (323), the oblong exhaust hole (324), the square exhaust hole (325), the oval exhaust hole (326), and the toothed exhaust hole (327) are arranged on the circumference of the valve core (3). One end of the plug (5) extends towards the valve core (3) to the valve body limit step (26). The valve body (21) has an oil tank port (22), an oil inlet (23), and an oil outlet (24). There is more than one oil outlet (24). The valve core (3) passes through the oil tank port (22), the oil inlet (23), and the oil outlet (24). The valve core (3) has a damping hole (31).

2. The hydraulic brake valve according to claim 1, characterized in that: The operating mechanism (1) has a roller (10), a support shaft (11), a push rod, a handle, and a pedal.

3. The exhaust process method of the hydraulic brake valve according to any one of claims 1-2, characterized in that: The return spring (7) of the plug (5) presses against the valve core (3). The valve core (3) presses against the plug (9). The working spring (8) in the inner hole of the plug (9) presses against the head of the plug (9). The plug (9) presses against the roller (10). The roller (10) pushes the operating mechanism (1) to work. The roller (10) of the operating mechanism (1) touches the plug (9) and moves downward. The working spring (8) at the center of the plug (9) presses down the valve core (3). The valve core (3) presses down the return spring (7). The return spring (7) presses down the spring seat (4) and the plug (5).

4. The exhaust process method of the hydraulic brake valve according to claim 3, characterized in that: The outer side wall of the spool (3) is sealed with the inner wall of the valve body (21) and slides along the inner wall of the spool (3). A plug (5) and a sealing ring (6) are arranged in the valve body (21). The sealing ring (6) prevents hydraulic oil from flowing out through the gap between the valve body (21) and the plug (5) and prevents outside air from penetrating into the hydraulic braking system. There is a spring seat (4) in the plug (5) that abuts against the support and the return spring (7). A return spring (7) is sleeved on the spring seat (4), with one end abutting against the step surface of the spool (3) and the other end abutting against the spring seat (4). One end of the return spring (7) and the spool (3) abut against each other. Under the action of the return spring, the sealed part between the outer side wall of the spool and the inner wall of the valve body (21) is located between the oil inlet (23) and the exhaust hole (32). Applying a driving force away from the spring seat (4) to the spool (3), an exhaust hole (32) is provided on one side wall of the spool (3) to automatically discharge the gas in the valve body. The exhaust hole (32), the spool feedback channel (33), and the hydraulic cavity (25) are connected. The gas in the hydraulic cavity is guided to flow out through the spool (3) and the feedback channel via the damping hole (31), so that the remaining gas in the hydraulic cavity (25) is discharged from the fuel tank port (22), preventing abnormal noise from occurring in the hydraulic brake valve.

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