Linear normally-open electromagnetic valve applied to automobile braking system

Abstract

The utility model discloses a linear normally-open electromagnetic valve applied to an automobile braking system. Comprising a guide sleeve, an armature core, an ejector rod assembly, a valve body, a valve seat, a throttling sleeve, an oil filter and a precise steel ball. The guide sleeve is welded and fixed at the upper end of the valve body; an armature core matched with an external coil is arranged in a cavity formed in the guide sleeve and the upper end of the valve body; a center through hole is formed in the valve body, the ejector rod assembly, the valve seat and the throttling sleeve are sequentially installed in the center through hole from top to bottom, a ball groove is formed in the bottom face of the valve body and forms a one-way valve with a precise steel ball, a groove hole is formed between the ejector rod assembly and the valve seat and forms another one-way valve with another steel ball, and the oil filter is arranged outside the bottom of the valve body in a sleeved mode. The one-way valve is arranged on the valve body, so that the one-way valve is simple in part structure, suitable for automatic assembly, higher in qualified rate and better in performance.

Description

Technical Field

[0001] The utility model relates to a solenoid valve, in particular to a linear normally open solenoid valve used in automobile braking systems. Background Art

[0002] Since the automotive industry began undergoing profound adjustments, competition has intensified. Component manufacturers face pressures such as rising upstream raw material prices, labor shortages, constant price pressure from customers, and increasing environmental requirements. However, as electronic stability control systems (ESCs) become increasingly prevalent and their functionality improves, the frequency of solenoid valve use and the coverage of various operating conditions are also increasing. Existing functions require linear brake pressure regulation, which requires greater precision. Faced with this growing conflict, cost reduction and efficiency improvement are the only options. Existing solenoid valves have complex components, resulting in high component and assembly costs. Many use plastic check valve bases, which are susceptible to environmental influences and lack reliability. Summary of the Invention

[0003] To address the problems of the prior art, this utility model utilizes a linear normally open solenoid valve for automotive brake systems. While increasing reliability, it reduces the number of assembly parts, enhances sealing reliability, and increases control accuracy. This makes it adaptable to automated assembly lines, ensuring production efficiency and a high pass rate.

[0004] The technical solution of the utility model is as follows:

[0005] The utility model comprises a guide sleeve, an armature core, a push rod assembly, a valve body, a valve seat, a throttling sleeve, an oil filter and a precision steel ball; the guide sleeve is welded and fixed to the upper end of the valve body, and a cavity formed in the guide sleeve and the upper end of the valve body is provided with an armature core for cooperating with an external coil; a central through hole is provided in the valve body, and a push rod assembly, a valve seat and a throttling sleeve are sequentially installed in the central through hole from top to bottom; a ball groove is provided on the bottom surface of the valve body to form a one-way valve with a precision steel ball; a slot is provided between the push rod assembly and the valve seat to form another one-way valve with another steel ball; and an oil filter is sleeved outside the bottom of the valve body.

[0006] The inner diameter of the central through hole of the valve body is divided into three sections, the first section is clearance-matched with the push rod assembly, the second section is interference-sealed with the valve seat, and the third section is interference-pressed with the throttling sleeve.

[0007] The bottom end surface of the valve body is provided with an outer flange, the outer flange is provided with a ball groove, a precision steel ball is installed in the ball groove, and the precision steel ball and the conical surface of the ball groove cooperate to form a one-way valve.

[0008] The valve seat and the throttling sleeve are fixedly pressed into the valve body with interference fit.

[0009] The lower end of the push rod assembly and the upper end of the valve seat are elastically connected via a spring.

[0010] A radial through hole communicating with the outside is provided on the side wall of the valve body between the push rod assembly and the valve seat. The radial through hole is communicated with the outside through an oil filter.

[0011] The upper end of the valve seat is provided with a flow hole with a conical groove and a center hole for spherical sealing with another steel ball from top to bottom, and a step boss for positioning the connecting spring is provided on the edge of the upper end surface.

[0012] The throttling sleeve is provided with a central inner hole which penetrates axially up and down.

[0013] The oil filter integrates the surrounding ring filter screen and the bottom end filter screen on a plastic part, which is pressed together with the precision steel ball in the ball groove at the bottom of the valve body to form a one-way valve.

[0014] The bottom mating surface of the oil filter is provided with a countersunk hole for increasing the oil flow rate.

[0015] The beneficial effects of the utility model are:

[0016] This electromagnetic normally open valve incorporates the check valve's slot directly into the valve body, simplifying the structure and eliminating a sealing point. The valve body's internal bore consists of three sections, each used to mount the push rod assembly, valve seat, and throttling sleeve. This simplifies assembly and increases the efficiency of solenoid valve production.

[0017] The oil filter for the electromagnetic normally open valve of this utility model integrates the ring oil filter and the bottom oil filter into one oil filter, which is more simple in structure. A countersunk hole is set at the lower end of the one-way valve hole to increase the flow rate of the one-way valve, thereby improving the efficiency of electromagnetic valve production.

[0018] The valve seat of the utility model is provided with a structure of a spring mounting seat, thereby increasing the stability of the movement of the push rod assembly in the valve body.

[0019] The throttling sleeve of the utility model can be formed by stamping, and the center hole can be set to different sizes according to flow requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is the structural diagram of the linear normally open solenoid valve;

[0021] Figure 2 This is the exploded diagram of the linear normally open solenoid valve.

[0022] In the figure: a guide sleeve (1), an armature core (2), a push rod assembly (3), a valve body (4), a spring (5), a valve seat (6), a throttle sleeve (7), an oil filter (8) and a precision steel ball (9). DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the accompanying drawings and examples.

[0024] like Figure 1 He Ru Figure 2 As shown, the linear normally open solenoid valve includes a guide sleeve 1, an armature core 2, a push rod assembly 3, a valve body 4, a spring 5, a valve seat 6, a throttling sleeve 7, an oil filter 8 and a precision steel ball 9;

[0025] The guide sleeve 1 is welded and fixed to the upper end of the valve body 6. The cavity formed by the guide sleeve 1 and the upper end of the valve body 6 contains the armature core 2 for cooperating with the external coil. There is a certain movable gap in the cavity for the armature core 2 to be controlled by the external coil.

[0026] A central through hole is provided in the valve body 4, in which the push rod assembly 3, valve seat 6 and throttling sleeve 7 are installed from top to bottom. A ball groove is provided on the bottom surface of the valve body 4, which together with a precision steel ball 9 form a one-way valve. A slot is provided between the push rod assembly 3 and the valve seat 6, which together with another steel ball form another one-way valve. The oil filter 8 is finally mounted on the outside of the bottom of the valve body 4 to form an interference fit.

[0027] The center through hole of the valve body 4 is divided into three sections with different inner diameters. The first section is clearance-fitted with the push rod assembly 3 , the second section is press-fitted with the valve seat 6 for interference sealing, and the third section is press-fitted with the throttling sleeve 7 for interference press fitting.

[0028] The bottom end face of the valve body 4 is provided with an outer flange, which is provided with a ball groove. The ball groove is equipped with a precision steel ball 9. The precision steel ball 9 and the conical surface of the ball groove cooperate to form a one-way valve. In this way, the hole groove of the one-way valve is directly provided on the valve body 4, and the hole and the precision steel ball 9 form a one-way valve.

[0029] The valve seat 6 and the throttling sleeve 7 are both fixedly pressed into the valve body 4 with interference fit, and the throttling sleeve 7 is pressed into the bottom of the central through hole of the valve body 4 .

[0030] The lower end of the push rod assembly 3 and the upper end of the valve seat 6 are elastically connected via a spring 5 .

[0031] A radial through hole communicating with the outside is provided on the side wall of the valve body 4 between the push rod assembly 3 and the valve seat 6 , and the radial through hole is communicated with the outside through the oil filter 8 .

[0032] Oil pressure enters the radial through hole and ball groove from the outside around the valve body 4, and flows out in one direction under the action of the two steel balls.

[0033] The upper end of the valve seat 6 is provided with a flow hole with a conical groove and a center hole from top to bottom for spherical sealing with another steel ball, and the edge of the upper end surface is provided with a step boss for positioning the lower end of the connecting spring 5.

[0034] A steel ball is installed at the lower end of the push rod assembly 3, and the steel ball cooperates with the flow hole at the top center of the valve seat 6. The flow hole at the top center of the valve seat 6 is an annular cone surface with a larger upper part and a smaller lower part as a cone groove.

[0035] The throttle sleeve 7 is provided with a central inner hole which is axially passed through from top to bottom. The central inner hole can be designed with different diameters according to different oil flow requirements. The throttle sleeve is formed by stamping, and the central hole can be set to different sizes according to flow requirements.

[0036] The oil filter 8 integrates the surrounding ring filter screen and the bottom end filter screen into a plastic part, and is pressed together with the precision steel ball 9 in the ball groove at the bottom of the valve body 4 to form a one-way valve.

[0037] Furthermore, a countersunk hole is provided on the bottom mating surface of the oil filter 8 to increase the oil flow rate.

[0038] The bottom aperture of the oil filter 8 is smaller than the center aperture of the ball groove of the valve body 4 to prevent the steel ball from falling off.

[0039] The working process and principle of this utility model are as follows:

[0040] During the pressurization stage, the armature core 2 does not move, the spherical surface of the steel ball at the lower end of the push rod assembly 3 does not fit the valve seat, and the brake fluid can flow from the high-pressure area to the low-pressure area through the throttling sleeve 7, the flow hole of the valve seat 6 and the one-way valve hole of the valve body 4.

[0041] During the pressure holding stage, the armature core 2 moves, and the spherical surface of the steel ball at the lower end of the push rod assembly 3 fits against the valve seat. After the pressure is built up, a pressure difference is formed at the inlet and outlet of the one-way valve of the valve body 4. The steel ball fits tightly against the conical surface of the notch to form a seal, and the brake fluid cannot pass through the conical surface of the notch of the one-way valve, thereby maintaining the pressure.

[0042] The brake fluid enters from the oil filter 8, the inner circumference of the oil filter 8 is interference fit with the outer circumference of the bottom of the valve body 4, the steel ball 9 and the slot hole at the bottom of the valve body 4 form a one-way valve, and the steel ball 9 has a movable gap in the slot hole along the axial direction of the valve body 4.

[0043] When the coil of armature core 2 is de-energized, push rod assembly 3 is held in upward motion by the brake fluid pressure at its lower end and the force of spring 5. Push rod assembly 3 drives armature core 2 upward along its axis until it contacts guide sleeve 1. At this point, the steel ball at the lower end of push rod assembly 3 separates from the small flow holes in valve seat 6, allowing oil to flow in. Brake fluid now flows upward through oil filter 8, generating hydraulic pressure. A pressure differential develops across the check valve, pushing steel ball 9 against the sealing cone of the slot, closing the check valve. The brake fluid then flows through throttling sleeve 7 and the small flow holes in valve seat 6, exiting through the symmetrically arranged oil outlet holes in valve body 4, forming the normally open oil circuit for the normally open solenoid valve.

[0044] When the coil of the armature core 2 is energized, the coil generates an electromagnetic force on the armature core 2 that is downward along the axis and applied to the push rod assembly 3. At this time, the liquid pressure at the lower end of the push rod assembly 3 and the elastic force of the spring 5 are both vertically upward, forming an upward force that is much smaller than the sum of the electromagnetic force applied to the push rod assembly 3 by the armature core 2 and the downward force of the weight of the armature core and the push rod. Therefore, at this time, the armature core 2 pushes the push rod downward until the armature core 2 fits against the valve seat 6 and cannot move further downward. At this time, the middle steel ball at the lower end of the push rod assembly 3 is pressed and blocked by the flow hole of the valve seat 6, and the oil inlet is closed.

[0045] At this time, the normally open solenoid valve is closed, and the brake fluid enters along the oil filter 8 and cannot flow out through the valve seat 6.

[0046] At this time, the brake fluid enters along the oil filter 8, pushing the steel ball 9 of the one-way valve to press the slot hole, and the brake fluid cannot flow out through the one-way valve.

[0047] When returning the oil, the external brake fluid passes through the one-way valve at the bottom of the valve body 4, pushing the steel ball downward, opening the one-way valve slot, and the oil flows back through the lower hole of the oil filter 8.

[0048] It can be seen that the utility model has a simple parts structure by arranging the one-way valve on the valve body, is suitable for automatic assembly, has a higher pass rate and better performance.

Claims

1. A linear normally open solenoid valve used in automobile braking systems, characterized by: It includes a guide sleeve (1), an armature core (2), a push rod assembly (3), a valve body (4), a valve seat (6), a throttle sleeve (7), an oil filter (8) and a precision steel ball (9); The guide sleeve (1) is welded and fixed to the upper end of the valve body (4), and the cavity formed in the guide sleeve (1) and the upper end of the valve body (4) is equipped with an armature core (2) for cooperating with an external coil; a central through hole is provided in the valve body (4), and a push rod assembly (3), a valve seat (6) and a throttling sleeve (7) are installed in the central through hole from top to bottom. A ball groove is provided on the bottom surface of the valve body (4) to form a one-way valve with a precision steel ball (9), and a slot is provided between the push rod assembly (3) and the valve seat (6) to form another one-way valve with another steel ball. An oil filter (8) is sleeved on the outside of the bottom of the valve body (4); The central through hole of the valve body (4) is divided into three sections with different inner diameters. The first section is clearance-fitted with the push rod assembly (3), the second section is interference-sealed with the valve seat (6), and the third section is interference-pressed with the throttling sleeve (7). The bottom end surface of the valve body (4) is provided with an outer flange, and a ball groove is provided on the outer flange. A precision steel ball (9) is installed in the ball groove. The precision steel ball (9) and the conical surface of the ball groove cooperate to form a one-way valve. The oil filter (8) integrates the surrounding ring filter and the bottom end filter into a plastic part, and is pressed together with the precision steel ball (9) in the ball groove at the bottom of the valve body (4) to form a one-way valve; The bottom mating surface of the oil filter (8) is provided with a countersunk hole for increasing the oil flow rate.

2. A linear normally open solenoid valve for use in an automobile braking system according to claim 1, characterized in that: The valve seat (6) and the throttling sleeve (7) are both fixedly pressed into the valve body (4) with an interference fit.

3. The linear normally open solenoid valve used in an automobile brake system according to claim 1, characterized in that: The lower end of the push rod assembly (3) and the upper end of the valve seat (6) are elastically connected via a spring (5).

4. The linear normally open solenoid valve used in an automobile braking system according to claim 1, characterized in that: A radial through hole communicating with the outside is provided on the side wall of the valve body (4) between the push rod assembly (3) and the valve seat (6), and the radial through hole is communicated with the outside through the oil filter (8).

5. The linear normally open solenoid valve used in an automobile brake system according to claim 1, characterized in that: The upper end of the valve seat (6) is provided with a flow hole with a conical groove and a center hole in sequence from top to bottom for spherical sealing with another steel ball, and the edge of the upper end surface is provided with a step boss for positioning the connecting spring (5).

6. The linear normally open solenoid valve used in an automobile brake system according to claim 1, characterized in that: The throttling sleeve (7) is provided with a central inner hole which is axially passed through in the upper and lower directions.

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