Hydraulic lock with rapid pressure relief in the brake system

Abstract

The present invention relates to a hydraulic lock with a rapid pressure relief function in a brake system, comprising a coil assembly, a reset spring, a movable iron core, a push rod, a steel ball, an outer steel ball seat, an inner steel ball seat, a guide seat, a piston, and a valve core. The upper part of the valve body is equipped with the coil assembly, the outer steel ball seat, the inner steel ball seat, the guide seat, and a filter screen. The coil assembly is equipped with a movable iron core and a push rod, one end of the push rod is connected to the movable iron core, and the other end is connected to the steel ball located between the outer steel ball seat and the inner steel ball seat. The piston and the valve core are installed in the middle cavity of the valve body, and the lower part is provided with an oil return port H, a brake port S, and an oil inlet of a pressure servo valve. A check valve is provided in the channel connecting the oil return port H and the brake port S. When the hydraulic lock of the present invention is powered off, the high-pressure oil in the brake chamber will flow into the oil tank through the normally open port of the pressure servo valve valve core and the brake bypass check valve, thereby improving the controllability of the brake pressure and avoiding the dangerous situation that the brake pressure cannot be relieved due to special circumstances such as zero deviation of the pressure servo valve, full steering, and valve core stuck.

Description

Technical Field

[0001] The invention relates to a hydraulic solenoid valve, in particular to a hydraulic lock in a brake system. Background Art

[0002] At present, the principle of hydraulic lock in conventional brake system, such as Figure 1 As shown, the hydraulic lock is connected to the pressure servo valve 100, including a coil assembly 1, a reset spring 2, a movable iron core 3, a push rod 4, a steel ball 5, an outer steel ball seat 6, an inner steel ball seat 7, a guide seat 8, a filter screen 9, a piston 10, a valve core 11 and a valve body 12. There is an oil inlet P, an oil return port H, a brake port S, and a redundant oil supply port P. When the coil assembly 1 is energized, the electromagnetic force of the coil assembly 1 is greater than the hydraulic pressure, the inner steel ball seat 7 is in a closed state, the valve core 11 is in the right limit position under the action of the oil supply pressure, and the high-pressure oil enters the oil inlet J1 and J2 of the pressure servo valve; when the coil assembly 1 is de-energized, the inner steel ball seat 7 is in an open state under the action of the oil supply pressure of the J port, the outer steel ball seat 6 is closed, and the oil supply pressure acts on the piston 10 and the end face of the valve core 11 at the same time. The diameter of the piston 10 is larger than the valve core 11, pushing the valve core 11 to the left limit position, and the oil supply path of the pressure servo valve is closed.

[0003] In the conventional hydraulic lock structure, the high-pressure oil in the brake port can only be released through the pressure servo valve. When the pressure servo valve is zero-biased, full rudder or the valve core is stuck, the brake pressure cannot be released, which is a dangerous situation. Summary of the invention

[0004] The present invention aims to solve the problem that the brake pressure cannot be released due to a pressure servo valve failure during braking, and provides a hydraulic lock with a rapid pressure release function.

[0005] To achieve the above-mentioned purpose, the technical solution of the present invention is: a hydraulic lock with a rapid pressure relief function in a brake system, comprising a coil assembly, a reset spring, a movable iron core, a push rod, a steel ball, an outer steel ball seat, an inner steel ball seat, a guide seat, a piston, and a valve core. The upper part of the valve body is equipped with a coil assembly, an outer steel ball seat, an inner steel ball seat, a guide seat, and a filter screen. The coil assembly is equipped with a movable iron core and a push rod. One end of the push rod is connected to the movable iron core, and the other end is connected to the steel ball located between the outer steel ball seat and the inner steel ball seat. The piston and the valve core are installed in the middle cavity of the valve body. The lower part is provided with an oil return port H, a brake port S, and an oil inlet of a pressure servo valve. A one-way valve is provided in the channel connecting the oil return port H and the brake port S.

[0006] Furthermore, when the coil assembly is energized, the inner steel ball seat is in a closed state, the valve core is in the right limit position under the action of the oil supply pressure, the pressure servo valve oil supply path a is opened, the oil port b is closed, and the high-pressure oil entering from the high-pressure oil inlet J simultaneously enters the pressure servo valve oil inlet and the left side of the one-way valve, and the brake port pressure is always lower than the oil supply pressure, and the one-way valve is always in a cut-off state.

[0007] Furthermore, when the coil assembly is powered off, the inner steel ball seat is in an open state and the outer steel ball seat is closed under the action of the oil supply pressure of the high-pressure oil inlet J, and the oil supply pressure acts on the piston and the valve core end face at the same time. The piston diameter is larger than the valve core, pushing the valve core to the left limit position, the pressure servo valve oil supply path a is closed, and the oil port b is opened; the left side of the one-way valve is connected to the return oil pressure, and the brake port pressure is always greater than the return oil pressure, and the high-pressure oil in the brake chamber flows into the oil tank through the brake port S through the one-way valve.

[0008] The beneficial effects of the present invention are:

[0009] When the hydraulic lock of the present invention is powered off, the high-pressure oil in the brake chamber will flow into the oil tank through the normally open opening of the pressure servo valve core and the brake bypass one-way valve, thereby improving the controllability of the brake pressure and avoiding the dangerous situation that the brake pressure cannot be released due to special circumstances such as zero deviation of the pressure servo valve, full rudder and valve core jamming. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is the structural principle diagram of a conventional hydraulic lock in a brake system;

[0011] Figure 2 This is a schematic diagram of the hydraulic lock structure of the present invention. DETAILED DESCRIPTION

[0012] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0013] By analyzing the characteristics of pressure at each interface during the braking process, the present invention adds a one-way valve connected to the brake port on the basis of a conventional hydraulic lock, and adds a window b at the power level. In this way, the brake port pressure is directly directed to the return oil through the window b and the one-way valve, thereby adding a pressure relief channel and improving safety.

[0014] like Figure 2 As shown, the hydraulic lock with rapid pressure relief function of the present invention includes a coil assembly 1, a return spring 2, a movable iron core 3, a push rod 4, a steel ball 5, an outer steel ball seat 6, an inner steel ball seat 7, a guide seat 8, a filter screen 9, a piston 10, a valve core 11, a valve body 12 and a one-way valve 13, etc.

[0015] The upper part of the valve body 12 is equipped with a coil assembly 1, an outer steel ball seat 6, an inner steel ball seat 7, a guide seat 8, and a filter screen 9. The coil assembly 1 is equipped with a movable iron core 3 and a push rod 4. One end of the push rod 4 is connected to the movable iron core 3, and the other end is connected to the steel ball 5 located between the outer steel ball seat 6 and the inner steel ball seat 7.

[0016] When the coil assembly 1 is powered, the electromagnetic force of the coil assembly 1 is greater than the hydraulic pressure, the inner steel ball seat 7 is closed, the outer steel ball seat 6 is opened, the valve core 11 is in the right limit position under the action of the oil supply pressure, the pressure servo valve oil supply path a is opened, and the oil port b is closed. High-pressure oil simultaneously enters the pressure servo valve oil inlet J1, J2 and the left side of the one-way valve 13. Since the brake port pressure is always lower than the oil supply pressure, the one-way valve 13 is always closed. When the coil assembly 1 is powered off, the inner steel ball seat 7 is opened and the outer steel ball seat 6 is closed under the action of the J port oil supply pressure. The oil supply pressure acts on the piston 10 and the end face of the valve core 11 at the same time. The diameter of the piston 10 is larger than the valve core 11, pushing the valve core 11 to the left limit position, the pressure servo valve oil supply path a is closed, and the oil port b is opened. The left side of the one-way valve 13 is connected to the return oil pressure. Since the brake port pressure is always greater than the return oil pressure, the high-pressure oil in the brake chamber of the pressure servo valve 100 flows into the oil tank through the one-way valve 13.

[0017] When the coil assembly 1 is powered off, the inner steel ball seat 7 is in an open state and the outer steel ball seat 6 is closed under the action of the oil supply pressure of the high-pressure oil inlet J. The oil supply pressure acts on the piston 10 and the end faces of the valve core 11 at the same time. The diameter of the piston 10 is larger than that of the valve core 11, pushing the valve core 11 to the left limit position. The oil supply path a of the pressure servo valve is closed and the oil port b is opened; the return oil pressure is connected to the left side of the one-way valve 13, and the brake port pressure is always greater than the return oil pressure. The high-pressure oil in the brake chamber of the pressure servo valve 100 flows into the oil tank through the brake port S through the one-way valve 13.

Claims

1. A hydraulic lock with a rapid pressure relief function in a brake system, comprising a coil assembly, a reset spring, a movable iron core, a push rod, a steel ball, an outer steel ball seat, an inner steel ball seat, a guide seat, a piston, a valve core, and a valve body. The upper part of the valve body is equipped with a coil assembly, an outer steel ball seat, an inner steel ball seat, a guide seat, and a filter screen. The coil assembly is equipped with a movable iron core and a push rod. One end of the push rod is connected to the movable iron core, and the other end is connected to the steel ball located between the outer steel ball seat and the inner steel ball seat. The piston and the valve core are installed in the middle cavity of the valve body. The lower part is provided with an oil return port H, a brake port S, and an oil inlet of a pressure servo valve, characterized in that: A one-way valve is provided in the channel connecting the return oil port H and the brake port S; when the coil assembly is powered off, the inner steel ball seat is in an open state and the outer steel ball seat is closed under the action of the oil supply pressure of the high-pressure oil inlet J, and the oil supply pressure acts on the piston and the valve core end face at the same time. The piston diameter is larger than the valve core, pushing the valve core to the left limit position, the pressure servo valve oil supply path a is closed, and the oil port b is opened; the left side of the one-way valve is connected to the return oil pressure, and the brake port pressure is always greater than the return oil pressure, and the high-pressure oil in the brake chamber flows into the oil tank through the brake port S through the one-way valve.

2. The hydraulic lock with rapid pressure relief function in the brake system according to claim 1, characterized in that: When the coil assembly is energized, the inner steel ball seat is in a closed state, and the valve core is in the right limit position under the action of the oil supply pressure. The pressure servo valve oil supply path a is opened, and the oil port b is closed. The high-pressure oil entering from the high-pressure oil inlet J enters the pressure servo valve oil inlet and the left side of the one-way valve at the same time, and the brake port pressure is always lower than the oil supply pressure, and the one-way valve is always in a cut-off state.

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