Pulse control two-position two-way electromagnetic valve for automobile braking system

Abstract

The invention relates to a pulse control two-position two-way electromagnetic valve for an automobile braking system, and belongs to a component in an automobile hydraulic control braking system. One end of the sliding block is in sliding fit with the guide groove, the other end of the sliding block is fixedly connected with the valve element, the valve seat is in laser welding with the magnetism isolating pipe, the valve element is in sliding fit with the inner wall of the magnetism isolating pipe, the sliding pin component is installed between the special-shaped sliding groove and the flat-bottom through groove, and the electromagnetic valve coil is installed outside the fixed iron and the magnetism isolating pipe. The electromagnetic valve has the advantages that the structure is novel, compared with a traditional two-position two-way normally-closed electromagnetic valve, only one sliding block with a special-shaped flat-bottom sliding groove and one sliding pin component are additionally arranged, electromagnetic valve pulse control and electromagnetic valve opening and closing state circulation switching are achieved, an electromagnetic valve coil does not need to be powered on for a long time, and the electromagnetic valve is convenient to use. Assembling pre-pressure exists between the sliding pin component and the bottom face of the sliding groove, friction force, vehicle vibration and other interferences cannot cause the sliding pin component to deviate from a preset track, and it is guaranteed that the electromagnetic valve works reliably.

Description

Technical Field

[0001] The invention belongs to a component in a hydraulic control brake system of an automobile, and in particular relates to a pulse-controlled two-position two-way solenoid valve for an automobile brake system. Background Art

[0002] Most of the traditional large fuel commercial vehicles and special vehicles currently use pneumatic brake systems, and the parking brake system uses a mechanical parking air pressure release method. With the continuous maturity of wheel hub motor technology, new energy heavy-duty vehicles driven by wheel hub motors are also in the process of research and development and testing. Since the traditional pneumatic brake requires a large wheel side space, while the wheel side space of the vehicle driven by the wheel hub motor is small, the traditional brake cannot meet the design requirements. The hydraulic brake has a large efficiency and occupies a small installation space, so the hydraulic brake solution is widely considered and adopted. The driving and parking states of the hydraulic system need to be switched by controlling the solenoid valve, and better sealing characteristics and long-term pressure retention performance are required. The hydraulically controlled parking brake system has the following working conditions: the traditional two-position two-way solenoid valve controls the parking brake system pressure to switch from the power-off state to the power-on state, and needs to be maintained for a long time, which is easy to cause the coil to overheat due to long-term power-on and cause the system to fail. And when the vehicle is accidentally powered off, the solenoid valve cannot maintain the original working state, resulting in vehicle brake failure and safety accidents. Summary of the invention

[0003] The invention provides a pulse-controlled two-position two-way electromagnetic valve for an automobile brake system, so as to solve the existing problem of brake system failure caused by long-term coil energization.

[0004] The technical scheme adopted by the present invention is, including a valve core spring, a fixed iron, a sliding pin component, a solenoid valve coil, a valve core, a magnetic isolation tube, a valve seat and a slider, wherein the fixed iron is fixed to the magnetic isolation tube by laser welding, a guide groove is opened on the lower end face of the fixed iron, one end of the slider is slidably matched with the guide groove, the other end of the slider is fixedly connected to the valve core, a spring mounting hole is opened at the blind end of the fixed iron guide groove, and is elastically connected to one end of the slider through the valve core spring, the valve seat is laser welded to the magnetic isolation tube, the valve core is slidably matched with the inner wall of the magnetic isolation tube, one side of the slider has a flat-bottomed special-shaped slide groove, the fixed iron has a flat-bottomed through groove in a direction parallel to the end face, the sliding pin component is installed between the special-shaped slide groove and the flat-bottomed through groove, and the two end faces are respectively slidably matched with the bottom surface of the flat-bottomed through groove and the bottom surface of the special-shaped slide groove, and the solenoid valve coil is installed on the outside of the fixed iron and the magnetic isolation tube.

[0005] The valve core spring is in a compressed state during assembly.

[0006] The fixed iron is made of magnetic conductive material and has a flat bottom through groove. The welding point between the fixed iron and the magnetic isolation tube is higher than the flat bottom through groove.

[0007] The sliding pin component comprises a large cylindrical sliding cap, a small cylindrical sliding cap and a sliding pin spring, all of which are made of magnetic isolation material, wherein the inner hole wall of the large cylindrical sliding cap is slidably matched with the outer hole wall of the small cylindrical sliding cap, and the sliding pin spring is placed in the inner hole of the small cylindrical sliding cap.

[0008] The diameter of the large cylindrical sliding cap is smaller than the width of the flat-bottomed through groove of the fixed iron, the diameter of the small cylindrical sliding cap is smaller than the width of the special-shaped sliding groove of the slider, and the sliding pin spring is in a compressed state after assembly.

[0009] The valve core is made of magnetic conductive material, and its side wall is provided with an oil groove, which functions to keep the internal pressure of the electromagnetic valve the same.

[0010] The magnetic isolation tube is made of stainless steel.

[0011] The base is made of stainless steel.

[0012] The slider is made of magnetic isolation material and is provided with a special-shaped slide groove, a through groove and a side groove. The through groove is used to keep the internal pressure of the electromagnetic valve the same.

[0013] The side wall of the special-shaped slide groove includes an outer contour and an inner contour, which serves as a moving path for the sliding pin component. In order to ensure that there is enough stroke to complete the state switching, the maximum stroke δ of the valve core must be greater than the maximum stroke H of the sliding pin component relative to the special-shaped slide groove. In order to ensure reliable sealing, when the valve port is closed, the sliding pin component retains a gap h from the upper dead point of the special-shaped slide groove; during the sliding process of the slider, the side wall of the special-shaped slide groove and the side wall of the through groove constrain the sliding pin component and generate a combined force to push the sliding pin component to move according to the designed trajectory.

[0014] The advantages of the present invention are: novel structure, compared with the traditional two-position two-position normally closed solenoid valve, only one slider with a special-shaped flat bottom slide and one sliding pin component are added, so that the solenoid valve is closed for a long time by energizing and de-energizing the solenoid valve coil for one pulse, and the solenoid valve is opened for a long time by energizing and de-energizing again for one pulse, so that the solenoid valve is pulse controlled, and the solenoid valve is switched between the open and closed states in a cycle, and the solenoid valve coil does not need to be energized for a long time to maintain a certain state, thereby avoiding the failure of the brake system caused by long-term coil energization. The sliding pin component and the bottom surface of the slide groove have an assembly pre-pressure to generate friction, and interference such as vehicle vibration will not cause the sliding pin component to deviate from the predetermined trajectory, thereby ensuring the reliable operation of the solenoid valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 is a partial view of the sliding pin component of the present invention; Figure 3 It is a left side view of the slider of the present invention; Figure 4 is a three-dimensional view of the slider of the present invention; Figure 5It is a three-dimensional view of the fixed iron of the present invention. DETAILED DESCRIPTION

[0016] like Figure 1 As shown, it includes a valve core spring 1, a fixed iron 2, a sliding pin component 3, an electromagnetic valve coil 4, a valve core 5, a magnetic isolation tube 6, a valve seat 8, and a slider 9, wherein the fixed iron 2 is fixed to the magnetic isolation tube 6 by laser welding, a guide groove is opened on the lower end face of the fixed iron 2, one end of the slider 9 is slidably matched with the guide groove, and the other end of the slider 9 is fixedly connected to the valve core 5, a spring mounting hole is opened at the blind end of the guide groove of the fixed iron 2, and is elastically connected to one end of the slider 9 through the valve core spring 1, the valve seat 8 is laser welded to the magnetic isolation tube 6, the valve core 5 is slidably matched with the inner wall of the magnetic isolation tube 6, one side of the slider 9 has a flat-bottomed special-shaped slide groove 901, the fixed iron 2 has a flat-bottomed through groove 201 in a direction parallel to the end face, the sliding pin component 3 is installed between the special-shaped slide groove and the flat-bottomed through groove, and the two end faces are slidably matched with the bottom surface of the flat-bottomed through groove 201 and the bottom surface of the special-shaped slide groove 901 respectively, and the electromagnetic valve coil 4 is installed on the outside of the fixed iron 2 and the magnetic isolation tube 6.

[0017] The valve core spring 1 is in a compressed state during assembly.

[0018] The fixed iron 2 is made of magnetic conductive material, such as pure iron, and has a flat bottom through groove 201 therein. The welding point between the fixed iron 2 and the magnetic isolation tube 6 is higher than the flat bottom through groove 201 .

[0019] The sliding pin component 3 includes a large cylindrical sliding cap 301, a small cylindrical sliding cap 302 and a sliding pin spring 303, and all of them are made of magnetic isolation material, wherein the inner hole wall of the large cylindrical sliding cap 301 is slidably matched with the outer hole wall of the small cylindrical sliding cap 302, and the sliding pin spring 303 is placed in the inner hole of the small cylindrical sliding cap 302.

[0020] The diameter of the large cylindrical sliding cap 301 is smaller than the width of the flat-bottomed through groove 201 of the fixed iron 2, the diameter of the small cylindrical sliding cap 302 is smaller than the width of the special-shaped sliding groove 901 of the slider 9, and the sliding pin spring 303 is in a compressed state after assembly.

[0021] The valve core 5 is made of magnetic conductive material. As pure iron The side wall of the solenoid valve has an oil groove 501, which is used to keep the internal pressure of the solenoid valve the same.

[0022] The magnetic isolation tube 6 is made of stainless steel.

[0023] The base 7 is made of stainless steel.

[0024] The slider 9 is made of magnetic isolation material, such as engineering plastic injection molding, and has a special-shaped slide groove 901, a through groove 902 and a side groove 903. The through groove 902 is used to keep the internal pressure of the solenoid valve the same.

[0025] The side wall of the special-shaped slide groove 901 includes an outer contour 90101 and an inner contour 90102, which serve as the moving path of the sliding pin component 3. In order to ensure that there is enough stroke to complete the state switching, the maximum stroke δ of the valve core 5 must be greater than the maximum stroke H of the sliding pin component 3 relative to the special-shaped slide groove 901. In order to ensure reliable sealing, when the valve port is closed, a gap h is reserved between the sliding pin component 3 and the upper dead point of the special-shaped slide groove 901; during the sliding process of the slider 9, the side walls of the special-shaped slide groove 901 and the side walls of the through groove 201 constrain the sliding pin component 3 and generate a combined force, pushing the sliding pin component 3 to move according to the designed trajectory.

[0026] Assembly sequence: The slider 9 is interference riveted with the valve core 5, and the slider 9 is slidably matched with the fixed iron 2. When the flat-bottomed through groove 201 of the fixed iron 2 and the side groove 903 of the slider 9 are at the same height, the sliding pin component 3 is pushed into the groove. The bottom surface of the side groove 903 is slightly higher than the bottom surface of the special-shaped sliding groove 901, which can prevent the sliding pin component 3 from moving out of the sliding groove. The fixed iron 2 is welded to the magnetic isolation tube 6, and the magnetic isolation tube 6 is welded to the valve seat 8.

[0027] Working process: The valve seat 8 is assembled into the base 7, and the valve core 5 is in the solenoid valve port closed state under the action of the valve core spring 1, such as Figure 3 As shown, the small cylindrical sliding cap 302 of the sliding pin component 3 is located at a. When the solenoid valve coil 4 is energized, the electromagnetic force overcomes the valve core spring 1 force, driving the slider 9 to slide. The displacement of the small cylindrical sliding cap 302 relative to the slider 9 is shown in FIG. Figure 3 As shown by the middle dotted line, it slides all the way to stop at position b; at this time, the coil is powered off, and under the action of the valve core spring 1, the small cylindrical sliding cap 302 moves to position c and stops, and the solenoid valve port is in an open state; When the solenoid valve coil 4 is powered on again, the small cylindrical sliding cap 302 moves to position d and stops. When the power is turned off again, the small cylindrical sliding cap 302 returns to position a, and the solenoid valve port is closed. The solenoid valve state switching is repeated in this way. The assembly resistance of the sliding pin spring 303 of the sliding pin component 3 is adjusted to generate sufficient sliding friction between the two end surfaces of the sliding pin component 3 and the bottom plane of the slide groove, ensuring that the sliding pin component 3 moves along the designed route and will not deviate from the pre-designed trajectory due to gravity or vibration.

Claims

1. A pulse-controlled two-position two-way solenoid valve for an automobile braking system, characterized in that: It includes a valve core spring, a fixed iron, a sliding pin component, a solenoid valve coil, a valve core, a magnetic isolation tube, a valve seat, and a slider, wherein the fixed iron is fixed to the magnetic isolation tube by laser welding, a guide groove is opened on the lower end face of the fixed iron, one end of the slider slides in the guide groove, and the other end of the slider is fixedly connected to the valve core, a spring mounting hole is opened at the blind end of the fixed iron guide groove, and is elastically connected to one end of the slider through the valve core spring, the valve seat is laser welded to the magnetic isolation tube, the valve core slides in the inner wall of the magnetic isolation tube, one side of the slider has a flat-bottomed special-shaped slide groove, the fixed iron has a flat-bottomed through groove in a direction parallel to the end face, the sliding pin component is installed between the special-shaped slide groove and the flat-bottomed through groove, and the two end faces slide in cooperation with the bottom surface of the flat-bottomed through groove and the bottom surface of the special-shaped slide groove respectively, and the solenoid valve coil is installed on the outside of the fixed iron and the magnetic isolation tube.

2. The pulse-controlled two-position two-way solenoid valve for automobile braking system according to claim 1, characterized in that: The valve core spring is in a compressed state during assembly.

3. The pulse-controlled two-position two-way solenoid valve for automobile braking system according to claim 1, characterized in that: The fixed iron is made of magnetic conductive material and has a flat bottom through groove. The welding point between the fixed iron and the magnetic isolation tube is higher than the flat bottom through groove.

4. The pulse-controlled two-position two-way solenoid valve for automobile braking system according to claim 1, characterized in that: The sliding pin component comprises a large cylindrical sliding cap, a small cylindrical sliding cap and a sliding pin spring, all of which are made of magnetic isolation material, wherein the inner hole wall of the large cylindrical sliding cap is slidably matched with the outer hole wall of the small cylindrical sliding cap, and the sliding pin spring is placed in the inner hole of the small cylindrical sliding cap.

5. The pulse-controlled two-position two-way solenoid valve for automobile braking system according to claim 4, characterized in that: The diameter of the large cylindrical sliding cap is smaller than the width of the flat-bottomed through groove of the fixed iron, the diameter of the small cylindrical sliding cap is smaller than the width of the special-shaped sliding groove of the slider, and the sliding pin spring is in a compressed state after assembly.

6. The pulse-controlled two-position two-way solenoid valve for automobile braking system according to claim 1, characterized in that: The valve core is made of magnetic conductive material, and its side wall is provided with an oil groove, which is used to keep the internal pressure of the solenoid valve the same.

7. The pulse-controlled two-position two-way solenoid valve for automobile braking system according to claim 1, characterized in that: The magnetic isolation tube is made of stainless steel.

8. The pulse-controlled two-position two-way solenoid valve for automobile braking system according to claim 1, characterized in that: The base is made of stainless steel.

9. The pulse-controlled two-position two-way solenoid valve for automobile braking system according to claim 1, characterized in that: The slider is made of magnetic isolation material and is provided with a special-shaped slide groove, a through groove and a side groove. The through groove is used to keep the internal pressure of the electromagnetic valve the same.

10. The pulse-controlled two-position two-way solenoid valve for automobile braking system according to claim 9, characterized in that: The side wall of the special-shaped slide groove includes an outer contour and an inner contour, which serves as a moving path for the sliding pin component. In order to ensure that there is enough stroke to complete the state switching, the maximum stroke δ of the valve core must be greater than the maximum stroke H of the sliding pin component relative to the special-shaped slide groove. In order to ensure reliable sealing, when the valve port is closed, the sliding pin component retains a gap h from the upper dead point of the special-shaped slide groove; during the sliding process of the slider, the side wall of the special-shaped slide groove and the side wall of the through groove constrain the sliding pin component and generate a combined force to push the sliding pin component to move according to the designed trajectory.

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