CN216922678U

CN216922678U - Hydraulic brake valve

Info

Publication number: CN216922678U
Application number: CN202123264801.3U
Authority: CN
Inventors: 谢婵; 蒙学刘
Original assignee: Guangdong Tingjia Hydraulic Technology Co ltd
Current assignee: Guangdong Tingjia Hydraulic Technology Co ltd
Priority date: 2021-12-23
Filing date: 2021-12-23
Publication date: 2022-07-08
Anticipated expiration: 2031-12-23

Abstract

The utility model discloses a hydraulic brake valve.A valve body of a valve body component of an exhaust structure touches an operating mechanism for jacking the top of the valve body component, a valve plug of the valve body is provided with a working spring, a valve core is arranged in a central hole of the valve body and a central counter bore of a plug, the valve core is arranged in the center of the plug, the counter bore jacks a return spring, the return spring is arranged in a spring seat, and the spring seat is arranged in the counter bore of the plug. The roller of the operating mechanism is pressed with the plug in the valve body to form acting force and reacting force. The pushing operation mechanism and the valve core are mutually pressed to movably work. The valve core can slide along the inner wall of the valve body, the side wall of the valve core is provided with an exhaust hole, the valve body is internally provided with a plug for plugging the other end of the valve body, the plug is internally provided with a spring seat attached to the plug, and a return spring is arranged between the spring seat and the valve core. The advantages are that: the abnormal sound and the cavitation phenomenon caused by gas accumulation on the hydraulic brake valve are avoided, the normal transmission and circulation of hydraulic oil in a pipeline are ensured, and the hidden danger of a hydraulic brake system is eliminated.

Description

Hydraulic brake valve

Technical Field

The utility model relates to the field of hydraulic brake systems, in particular to a hydraulic brake valve.

Background

The hydraulic brake system mainly comprises a hydraulic pump, a liquid charging valve, an energy accumulator, a hydraulic brake valve, a pipeline, a brake and the like. When the hydraulic brake system works, the hydraulic pump charges the energy accumulator, when the set pressure is reached, the charging valve stops charging the energy accumulator, and the hydraulic oil is converted into oil supply for the hydraulic brake system. During braking, high-pressure hydraulic oil is supplied by the energy accumulator, and enters the brake after being decompressed through the hydraulic brake valve, so that the whole machine braking is realized. The hydraulic braking system relies on hydraulic oil to transmit power, air is inevitably mixed in the hydraulic oil due to the influence of objective conditions, the spherical air bubbles are suspended in the hydraulic oil, when the air bubbles are contained in the hydraulic oil, the flowing hydraulic oil becomes a gas-liquid two-phase flow, the volume and the elastic modulus of the flow are greatly reduced, and the compressibility is greatly increased, so that the braking efficiency of the hydraulic braking system is reduced, the control response is delayed, and the adverse effect that an execution element has a crawling phenomenon is possibly caused.

In addition, air bubbles in the hydraulic oil can also cause the following serious hazards to the entire hydraulic brake system:

1. abnormal sound and vibration are generated. When the hydraulic oil with dissolved bubbles flows to a place with higher pressure, the bubbles are instantaneously crushed to generate abnormal sound, and meanwhile, the large amount of bubbles are crushed to cause large hydraulic fluctuation, so that the hydraulic brake system generates vibration.

2. Causing cavitation damage to the hydraulic braking components. When the air bubbles collapse on the metal wall surface of the hydraulic braking element, the surrounding hydraulic oil flows to the collapse center at a high speed to generate a large impact force on the wall surface, and when a large number of air bubbles collapse, the metal wall surface of the hydraulic braking element is repeatedly subjected to severe impact to cause fatigue damage, so that the metal wall surface is corroded and falls off, and the metal wall surface becomes rough and even is a spongy small cave. This erosion of the surface of the solid material by the bubbles, known as cavitation, is one of the main causes of damage to the hydraulic braking elements.

3. Resulting in degradation of hydraulic oil quality. When the hydraulic oil bubbles collapse, the hydraulic oil bubbles are similar to an adiabatic compression state, local high temperature can occur, so that various additives of the oil are damaged, free carbon, acid grease and cement-like precipitates are generated, the degradation of the oil is accelerated, and a large chemical corrosion effect is generated on a hydraulic braking element.

Therefore, the bubble oil is a harmful phenomenon which is easily overlooked in the hydraulic brake system, and must be avoided as much as possible. The hydraulic brake valve is a core element of a hydraulic brake system, and hydraulic oil flowing inside the hydraulic brake valve usually generates bubbles, so that abnormal sound and cavitation are generated in the hydraulic brake valve. At present, no mode capable of well discharging gas in the hydraulic brake valve exists in the market, so that the hydraulic brake valve is required to be developed to automatically discharge the gas in the hydraulic brake valve so as to eliminate abnormal braking sound of the hydraulic brake valve and improve the running safety performance of a vehicle. Reference 1, application No.: CN2013103661105, invention name: a valve core feedback piston hydraulic brake valve comprises a valve body, a valve core, a return spring, a balance spring and a push rod; the valve body is provided with an input port, an output port, an oil return port and a valve core cavity, the input port, the output port and the oil return port are respectively communicated through the valve core cavity, the valve core is connected in the valve core cavity in a sliding manner, and the push rod is movably connected to the upper end of the valve core; a feedback channel is arranged in the valve core and is communicated between the output port of the valve body and the bottom end of the valve core cavity; the hydraulic brake valve further comprises a feedback piston, the upper part of the feedback piston is accommodated in the feedback channel, and the bottom end face of the feedback piston is in contact with the bottom surface of the valve core cavity. Reference 2, application No.: CN2016208173677, title of the utility model: the hydraulic brake valve of the wheel type engineering truck comprises a valve body and a valve core; the valve body consists of an upper valve body and a lower valve body; the valve core consists of an upper valve core, a spring seat, a pressing sleeve, a main spring lower valve core and a return spring; the upper valve body is provided with an upper oil inlet, an upper oil outlet and an upper oil return port, and the upper valve core is provided with an upper annular groove and an upper throttling oil hole; the lower valve body is provided with a lower oil inlet, a lower oil outlet and a lower oil return port, and the lower valve core is provided with a lower annular groove and a lower throttling oil hole. The comparison documents 1 and 2 are different from the present patent application in characteristic structure.

Disclosure of Invention

The utility model aims to provide a hydraulic brake valve and an exhaust structure thereof, which can smoothly exhaust gas mixed with hydraulic oil in an inner cavity of the hydraulic brake valve, avoid abnormal sound and cavitation caused by gas accumulation and eliminate hidden troubles of a hydraulic brake system. The hydraulic brake supplement avoids the cavitation erosion damage of the hydraulic brake element and the hydraulic component deterioration caused by the erosion of the bubbles which generate abnormal sound vibration on the surface of the solid material.

The technical scheme adopted for achieving the purpose is as follows: a hydraulic brake valve comprises an operating 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 reset spring, a hydraulic cavity, a valve core feedback channel, a limit step, an equal-diameter hole exhaust hole, a stepped hole exhaust hole, a round exhaust hole, a long round exhaust hole, a square exhaust hole, an oval exhaust hole, a tooth-shaped exhaust hole, a working spring, a plug, a roller and a fulcrum shaft, and is characterized in that the valve body component 2 is provided with the valve body 21, the center of the valve body 21 is provided with the plug 9, the upper end of the plug 9 is positioned between the working spring 8 and the roller 10, the plug 9 pushes against the roller 10 of the operating mechanism 1, the operating mechanism 1 is provided with the fulcrum shaft 11, the upper end of the plug 9 is provided with a touch pressure valve core 3, the lower end of the valve core 3 penetrates through the upper end of the reset spring 7 of the plug 5 installed on the valve body 21, the reset spring 7 is installed on the spring seat 4 of the center counter bore of the plug 5, the spring seat 4 is arranged in a central counter bore of the plug 5.

The valve core 3 is provided with a valve core feedback channel 33 and an exhaust hole 32, the valve core 3 is provided with 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 tooth-shaped exhaust hole 327, the valve core 3 is cylindrical and is provided with the exhaust hole 32, the exhaust hole 32 is arranged on the side wall of one end of the valve core 3 and is separated from a valve body oil inlet 23, the exhaust hole 32 is communicated with the valve core feedback channel 33 and the hydraulic cavity 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 tooth-shaped exhaust hole 327 are arranged on the circumference of the valve core 3, one end of a plug 5 extends to a valve body limiting step 26 in the direction of the valve core 3, the valve body 21 is provided with more than one oil tank port 22, oil inlet 23 and oil outlet 24.

The valve core 3 passes through the oil tank port 22, the oil inlet 23 and the oil outlet 24, and the valve core 3 is provided with a damping hole 31.

The operating mechanism 1 has a roller 10, a fulcrum 11 and a pedal.

Compared with the prior art, the utility model has the advantages that: the gas mixed in by the hydraulic oil in the inner cavity of the hydraulic brake valve can be smoothly discharged, abnormal sound and cavitation caused by gas accumulation are avoided, normal transmission and circulation of the hydraulic oil in a pipeline are ensured, and the hidden trouble of a hydraulic brake system is eliminated. The design is novel, the structure is advanced and reasonable, the manufacture is easy, the installation and the use are convenient, the energy is saved, the consumption is saved, and the safety and the reliability are realized.

Drawings

Fig. 1 is a front view of the assembly of the present invention.

FIG. 2 is an enlarged view of a portion A of FIG. 1.

Fig. 3 is a schematic front view of the valve cartridge of the present invention.

Fig. 4 is a partial schematic view of a vent of the venting structure of the present invention.

Fig. 5 to 10 are partial schematic views of another embodiment of the exhaust hole of fig. 4.

Reference numerals: the hydraulic control valve comprises a control handle 1, a valve body part 2, a valve body 21, an oil tank port 22, an oil inlet 23, an oil outlet 24, a valve core 3, a damping hole 31, an exhaust hole 32, a spring seat 4, a plug 5, a sealing ring 6, a return spring 7, a hydraulic cavity 25, a valve core feedback channel 33, a limiting step 26, 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, a tooth-shaped exhaust hole 327, a working spring 8, a plug 9, a roller 10 and a fulcrum shaft 11.

Detailed Description

The utility model is further described below with reference to the accompanying drawings:

embodiment 1, referring to fig. 1, a hydraulic brake valve includes a valve body 3, a plug 5, a packing 6, a return spring 7, and a spring seat 4. The valve body component 2 of the exhaust structure and the operating mechanism 1 located on the top of the valve body component 2, the valve body component 2 has one or two independent oil outlets 24, and the operating mechanism 1 is in the structure of a push rod, a handle or a pedal. 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 3, a plug 5 and a sealing ring 6 for plugging the other end of the valve body 21 are arranged in the valve body 21, the sealing ring 6 can prevent hydraulic oil from flowing out from a gap between the valve body 21 and the plug 5, meanwhile, the external air is prevented from permeating into the hydraulic braking system, a spring seat 4 which is attached to the plug 5 and used for supporting and positioning a return spring 7 is also arranged in the plug 5, a return spring 7 with one end abutting against the step surface of the valve core 3 and the other end abutting against the spring seat 4 is sleeved on the spring seat 4, the return spring 7 is abutted against one end of the valve core 3, and the sealing position between the outer side wall of the valve core 3 and the inner wall of the valve body 21 is positioned between the oil inlet 23 and the exhaust hole 32 under the action of the return spring 7, and can apply thrust to the valve core in the direction of enabling the valve core to be far away from the spring seat 4.

The valve core 3 is cylindrical and is provided with an exhaust hole 32, the exhaust hole 32 is formed in the side wall of one end of the valve core 3 and is isolated from the oil inlet 23 of the valve body, and the exhaust hole allowing air to pass through is formed in the side wall of one end of the valve core 3.

The exhaust hole 32 is directly communicated with the valve core feedback channel 33 and the hydraulic cavity 25, and can guide the gas in the hydraulic cavity to flow out from the feedback channel of the valve core 3 through the damping hole 31, so that the generated bubbles are exhausted from the oil return port, and are prevented from accumulating at one end of the valve core 3 to cause the hydraulic brake valve to generate abnormal sound.

Referring to fig. 4 to 5, the exhaust holes 32 are a plurality of circumferentially distributed equal-diameter hole exhaust holes 321 or stepped hole exhaust holes 322.

Referring to fig. 6 to 10, the exhaust holes 32 are shaped as circular exhaust holes 323, oblong exhaust holes 324, square exhaust holes 325, oval exhaust holes 326 or tooth-shaped exhaust holes 327.

The structural shape and the number of the exhaust holes can be obtained through a large number of tests and calculations, and meanwhile, the structural strength and the processing requirements of the valve core are considered.

One end of the plug 5 extends to the valve body limiting step 26 towards the valve core 3, the plug 5 is matched with the valve body step and is abutted tightly, the gas residual area in the hydraulic cavity 25 at one end of the valve core 3 can be reduced, and abnormal sound generated to the hydraulic brake valve due to gas accumulation is avoided.

Referring to fig. 1, when the hydraulic brake valve brakes, the operating mechanism 1 is executed, the valve core 3 moves towards the spring seat 4 to disconnect the oil outlet 24 from the oil tank port 22, the oil inlet 23 is communicated with the oil outlet 24, a part of hydraulic oil mixed with gas enters the brake through the oil outlet 24 of the valve body to brake, a part of hydraulic oil passes through the damping hole 31 on the valve core 3 to reach the valve core feedback channel 33 and the hydraulic cavity 25 to generate thrust force for making the valve core far away from the spring seat 4, until the operating force and the thrust force are balanced, the hydraulic brake valve is in a balanced state, and the oil outlet 24 is disconnected from the oil tank port 22 and the oil inlet 23. When the operating mechanism 1 is released, all parts return to the state shown in fig. 1, the thrust of the hydraulic oil to the valve core 3 disappears, the return spring 7 generates the thrust to the valve core 3, the valve core moves towards the spring seat 4, the oil inlet 23 is disconnected with the oil outlet 24, the oil outlet 24 is communicated with the oil tank port 22, and the gas remained in the hydraulic cavity 25 flows out from the exhaust hole 32 of the valve core through the damping hole 31 along with the hydraulic oil, so that the generated bubbles are discharged out of the hydraulic brake valve from the oil tank port 22.

As the hydraulic brake valve is actuated, any remaining air, such as air in the hydraulic chamber, is vented through the vent structure, and this air flows through the inlet port 23, the outlet port 24, the orifice 31, the hydraulic chamber 25 and the tank port 22 and back to the hydraulic brake system tank, obviously without being trapped in the hydraulic chamber 25 at one end of the spool 3.

Embodiment 2, an exhaust structure for a hydraulic brake valve, the exhaust structure comprising: the hydraulic brake valve comprises a valve core 3, a plug 5, a sealing ring 6, a return spring 7 and a spring seat 4, wherein the outer side wall of the valve core 3 is sealed with the inner wall of a valve body 21 and can slide along the inner wall of the valve body 21, the plug 5 and the sealing ring 6 for plugging the other end of the valve body are arranged in the valve body 21, the sealing ring 6 can prevent hydraulic oil from flowing out from a gap between the valve body 21 and the plug 5 and prevent external air from permeating into a hydraulic brake system, the plug 5 is also internally provided with the spring seat 4 which is attached to the plug 5 and used for supporting and positioning the return spring 7, the spring seat 4 is sleeved with the return spring 7, one end of the return spring 7 is attached to the step surface of the valve core 3, the other end of the return spring is attached to the spring seat 4, the return spring 7 is attached to one end of the valve core 3, and the sealing position between an oil inlet 23 and an exhaust hole 32 between the outer side wall of the valve core 3 and the inner wall of the valve body 21 under the action of the return spring 7, and a thrust force in a direction in which the spool moves away from the spring seat 4 can be applied to the spool 3. The valve core 3 is cylindrical and is provided with an exhaust hole 32, and the exhaust hole 32 is formed in the side wall of one end of the valve core and is isolated 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 cavity 25, and can guide the gas in the hydraulic cavity to flow out from the feedback channel of the valve core 3 through the damping hole 31, so that the gas remained in the hydraulic cavity is exhausted from the oil tank port 22, and the gas is prevented from accumulating at one end of the valve core 3 to cause abnormal sound of the hydraulic brake valve.

Embodiment 3, referring to the drawings and embodiments 1 and 2, the utility model further provides a hydraulic brake valve, which comprises a valve body part 2 with an exhaust structure and an operating mechanism 1 positioned at the top of the valve body part 2, wherein the valve body part 2 is provided with one or two independent oil outlets 24, the operating mechanism 1 is in a push rod, handle or pedal structure, and the hydraulic brake valve is characterized in that the exhaust structure is the structure of the embodiments 1 and 2.

Claims

1. A hydraulic brake valve comprises an operating 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 reset spring, a hydraulic cavity, a valve core feedback channel, a limiting step, an equal-diameter hole exhaust hole, a stepped hole exhaust hole, a round exhaust hole, a long round exhaust hole, a square exhaust hole, an oval exhaust hole, a tooth-shaped exhaust hole, a working spring, a plug, a roller and a fulcrum shaft, and is characterized in that the valve body component (2) is provided with the valve body (21), the center of the valve body (21) is provided with the plug (9), the upper end of the plug (9) is positioned between the working spring (8) and the roller (10), the plug (9) pushes against the roller (10) of the operating mechanism (1), the operating mechanism (1) is provided with the fulcrum shaft (11), the upper end of the touch-pressure valve core (3) is arranged below the plug (9), and the lower end of the valve core (3) penetrates out of the upper end of the reset spring (7) provided with the plug (5) arranged on the valve body (21) The head, reset spring (7) are installed on spring seat (4) of the central counter bore of end cap (5), and spring seat (4) are installed in the central counter bore of end cap (5).

2. The hydraulic brake valve according to claim 1, wherein the spool (3) has a spool feedback passage (33) and an exhaust hole (32), the spool (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 tooth-shaped exhaust hole (327), the spool (3) is cylindrical and has the exhaust hole (32), the exhaust hole (32) is provided on a side wall of one end of the spool (3) and is blocked from the valve body oil inlet (23), the exhaust hole (32) is communicated with the spool feedback passage (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 tooth-shaped exhaust hole (327) are arranged on a circumference of the spool (3), one end of the plug (5) extends to the valve body limiting step (26) towards the valve core (3), the valve body (21) is provided with an oil tank opening (22), an oil inlet (23) and an oil outlet (24), and more than one oil outlet (24) is arranged.

3. The hydraulic brake valve according to claim 1, wherein the spool (3) passes through the tank port (22), the inlet port (23), and the outlet port (24), and the spool (3) has a damping hole (31).

4. A hydraulic brake valve according to claim 1, characterised in that the operating mechanism (1) comprises a roller (10), a fulcrum (11), a push rod, a handle and a pedal.