Moving iron positioning mechanism for shock absorber damping preceding-stage valve execution assembly

Abstract

The utility model relates to a moving iron positioning mechanism for a damper damping preceding stage valve execution assembly, which adopts a single-spring structure to replace the traditional double-spring arrangement, simplifies the adjusting process of preloading force, reduces the number of assemblies and manufacturing cost, changes the original valve armature guided by shaft sleeves at two ends inside into external guide, and improves the working efficiency. The problem that two shaft sleeves are needed for high-precision adjustment in the prior art is avoided, the number of parts is reduced, cost is reduced, assembly efficiency is improved, the friction coefficient between the valve armature and the magnetism isolating sleeve is remarkably reduced due to the arrangement of the movable iron anti-abrasion structure, abrasion is reduced, the service life of the parts is prolonged, and the service life of the parts is prolonged. And the maintenance requirement and the operation cost are reduced, the requirement for the machining precision of the valve armature and the magnetism isolating sleeve is lowered, the machining cost is reduced, and meanwhile the functionality and performance of components are kept.

Description

Technical Field

[0001] The utility model relates to the field of shock absorbers, in particular to a moving iron positioning mechanism for a damping front-stage valve actuator assembly of a shock absorber. Background Art

[0002] Traditional shock absorbers have fixed characteristics and provide fixed damping characteristic curves during extension or compression, while adjustable shock absorbers provide a characteristic field. The system selects different damping in the field in a timely manner according to the working conditions (road conditions, braking, acceleration, turning, driver's wishes, etc.) to curb body vibration, prevent tires from bouncing, and maintain body stability. Variable damping shock absorbers are mainly realized through magnetorheological, solenoid valve, stepper motor and other methods. Solenoid valve type is widely used for its reliable performance, low cost, quick response, compact structure and other advantages.

[0003] Solenoid valve type variable damping shock absorbers are being used more and more widely at home and abroad. They are mainly controlled by the front-stage valve actuator, thereby setting the pressure in the control chamber. The control pressure applies a closing force to the main-stage valve. The front-stage valve can be used to control very large adjustment forces or closing forces with lower energy input. By using the front-stage valve and the main-stage valve and, if necessary, a series connection with a traditional solenoid valve as part of the solenoid valve device, the characteristic curve characteristics can be greatly influenced.

[0004] The applicant previously filed a Chinese utility model patent application numbered CN202320526827.0, which disclosed an external proportional solenoid valve device for a shock absorber. The protective cover originally provided with a power supply interface was changed to a direct wire connection, and the electromagnetic coil was arranged in the mounting portion, so that one end of the wire was connected to the electromagnetic coil, and the other end was extended to the outside to directly connect to electricity, so that the original contact coupling was changed to a direct wire connection, thereby avoiding the phenomenon that the electromagnetic coil is easily broken. At the same time, the mounting portion of the protective cover is directly covered by the valve housing, so that the electromagnetic coil and the front-stage valve actuator are protected. The protective cover is not affected by external dirt and makes it easy to arrange the wires. At the same time, the protective cover is connected to the valve housing through a detachable connection structure, which is convenient for assembly and maintenance. The front-stage valve actuator assembly includes a moving iron core shaft connected to the front-stage valve assembly, a valve body middle piece sleeved outside the moving iron core shaft, a valve armature driving the moving iron core shaft to work and a valve spring and a return spring. The valve body middle piece is used to separate the front-stage valve actuator assembly from the front-stage valve assembly, the electromagnetic coil and the valve armature are electromagnetically induced, and the valve armature is maintained in a predefined initial position by the valve spring and the return spring acting in opposite directions.

[0005] However, the front-stage valve actuator in the above technical solution has the following defects in actual use: 1. The springs at both ends of the moving iron core shaft in the prior art are arranged in series to control the preload force of the front-stage valve, but the double spring series connection method requires the moving iron core to adjust the balance of the springs at both ends when adjusting the preload force, which increases the cost and process steps, and the fluctuation range caused by the superposition of the double spring tolerances is too large, resulting in cumbersome and difficult adjustment of the preload force; 2. The front-stage valve in the prior art is centrally guided by the shaft sleeves installed at both ends of the moving iron core shaft during the lifting process, and the two shaft sleeves need to be accurately adjusted to be on the same axis. This guiding method is cumbersome to install and has high cost; 3. In order to reduce the friction force of the front-stage valve during the lifting process and improve its transmission efficiency, the contact surface between the magnetic isolation sleeve and the valve armature needs to be processed with high precision to improve its strength and finish, but such parts have high processing requirements and high cost. Utility Model Content

[0006] The technical problem to be solved by the utility model is that in view of the deficiencies of the above-mentioned prior art, a moving iron positioning mechanism is provided for a shock absorber damping front-stage valve actuator assembly. The moving iron positioning mechanism adopts a single spring structure instead of the traditional double spring setting, which simplifies the preload force adjustment process, reduces the number of components and manufacturing costs, and changes the valve armature originally guided by the shaft sleeves at both ends to an external guide, thus avoiding the problem of high-precision adjustment of two shaft sleeves, reducing the number of parts and components, reducing costs and improving assembly efficiency. The setting of the moving iron anti-wear structure significantly reduces the friction coefficient between the valve armature and the magnetic isolation sleeve, reduces wear, extends the service life of the components, and reduces maintenance requirements and operating costs, reduces the requirements for the machining accuracy of the valve armature and the magnetic isolation sleeve, reduces machining costs, and maintains the functionality and performance of the components.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a moving iron positioning mechanism for a shock absorber damping front-stage valve actuator, comprising a magnetic isolation sleeve with an opening at one end, a valve armature, a moving iron seat and a front-stage valve, the moving iron seat being installed on the magnetic isolation sleeve and cooperating with the magnetic isolation sleeve to form a moving iron movable cavity for the valve armature to move axially therein, one end of the valve armature being abutted against the magnetic isolation sleeve by an elastic member, and the other end being provided with a moving iron core extending out of the moving iron seat and fixedly connected to the front-stage valve, and the valve armature being maintained in a predefined initial position by the elastic member.

[0008] By adopting the above technical scheme, the moving iron core is a key component in the electromagnetic damping valve device, and its stability and movement accuracy directly affect the adjustment effect of the damping force. The single spring arranged on the moving iron core replaces the original double spring series structure. The preload force adjustment of the front-stage valve is realized through a single spring, which simplifies the force transmission path, reduces the influence of the stiffness difference between springs on the preload force adjustment accuracy, reduces the force fluctuation caused by inconsistent spring stiffness, and realizes precise control of the closing pressure of the front-stage valve, thereby ensuring the consistency and reliability of the damping force adjustment. At the same time, the use of a single spring also helps to reduce costs and the number of components, and improves the stability and durability of the entire damping valve device.

[0009] The above-mentioned movable iron positioning mechanism for the shock absorber damping front-stage valve actuator assembly can be further configured as follows: the outer peripheral surface of the valve armature slides against the inner wall of the magnetic isolation sleeve, the elastic member is a preload spring, and the end of the valve armature away from the front-stage valve is provided with a spring accommodating chamber for accommodating the preload spring, one end of the preload spring is against the magnetic isolation sleeve, and the other end is against the valve armature, and a preload closing pressure is applied to the front-stage valve.

[0010] By adopting the above technical scheme, the setting of the elastic part (preload spring) is based on the principle of mechanical mechanics, and the preload force is provided by the elastic deformation of the spring. The axial movement of the valve armature is realized by the subsequent electromagnetic coil. At the same time, the preload force of the spring ensures the initial preload force of the valve armature. Even when the electromagnetic coil is not energized, the front-stage valve can maintain a certain closing force, thereby avoiding leakage and performance degradation of the damping valve. The valve armature originally guided by the shaft sleeves at both ends is changed to external guidance, so that the outer peripheral surface of the valve armature slides against the inner wall of the upper magnetic isolation sleeve, and then the original inner shaft guide is converted into an outer guide sliding, which avoids the problem of high-precision adjustment of two shaft sleeves and reduces the number of parts, thereby reducing costs and improving assembly efficiency.

[0011] The above-mentioned movable iron positioning mechanism for a damper damping front-stage valve actuator assembly can be further configured as follows: an axial channel penetrating both ends of the valve armature is opened on the valve armature, and the axial channel connects the damping medium at both ends of the movable iron active cavity to each other.

[0012] With the above technical solution, the setting of the axial channel is based on the principle of fluid mechanics. By providing a direct flow path, the resistance to the flow of the damping medium is reduced, so that the medium can be quickly filled or discharged when the valve armature moves, thereby quickly responding to changes in external forces, thereby enhancing the response speed and adjustment ability of the shock absorber.

[0013] The above-mentioned movable iron positioning mechanism for a damper damping front-stage valve actuator assembly may be further configured as follows: the valve armature and the movable iron core are integrally formed.

[0014] By adopting the above technical solution, the one-piece valve armature and moving iron core design reduces the number of components, simplifies the manufacturing process, improves the rigidity and reliability of the components, and also reduces the production cost.

[0015] The above-mentioned movable iron positioning mechanism for a damper damping front-stage valve actuator assembly may be further configured as follows: the valve armature is fixedly connected to the movable iron core by threading, pressing, welding or riveting.

[0016] With the above technical solution, the connection methods such as threading, pressing, welding or riveting are all based on the principle of mechanical connection, and the fixation between two parts is achieved through different methods. Each method has its specific application scenarios and advantages, such as the detachability of threaded connection and the tightness of press-fit connection, the high strength of welding and riveting, etc., which are suitable for shock absorbers in different application environments.

[0017] The above-mentioned movable iron positioning mechanism for the front-stage valve actuator assembly of the shock absorber can be further configured as follows: a polytetrafluoroethylene film body is provided between the valve armature and the magnetic isolation sleeve, and the polytetrafluoroethylene film body is sleeved on the inner wall of the magnetic isolation sleeve and abuts against the outer wall of the valve armature.

[0018] By adopting the above technical scheme, in the existing design, shaft sleeves must be present at both ends of the moving iron, and the verticality is ensured by the cooperation between the moving iron shaft and the shaft sleeve to avoid the moving iron core from tilting during movement, thereby generating friction. By converting the moving iron core into an external guided sliding, a polytetrafluoroethylene film body is provided, which can reduce the friction caused by the tilt of the moving iron core during operation, reduce the energy loss and wear caused by friction, extend the service life of the damping valve, and reduce the requirements for the surface finish of the valve armature and the magnetic isolation sleeve. The use of the polytetrafluoroethylene film body significantly reduces the friction coefficient between the valve armature and the magnetic isolation sleeve, reduces wear, and improves the life and reliability of the component.

[0019] The above-mentioned moving iron positioning mechanism for the front-stage valve actuator of a shock absorber can be further configured as follows: the magnetic isolation sleeve is composed of an upper magnetic conductive sleeve, a magnetic isolation ring and a lower magnetic conductive sleeve through welding, the upper magnetic conductive sleeve and the lower magnetic conductive sleeve are made of DT4C or DT4E materials, and the magnetic isolation ring is made of copper or stainless steel materials.

[0020] Using the above technical solution, welding is a commonly used metal connection technology, which melts and connects metals together through high temperature to form a high-strength connection. Brazing or electron beam welding is preferred, and non-magnetic materials are used for welding. Among them, DT4C or DT4E is a high-strength aluminum alloy with good mechanical properties and magnetic properties, which is suitable for manufacturing solenoid valve components. Copper and stainless steel are used as magnetic isolation materials, which can effectively control the distribution of the magnetic field and improve the performance of the solenoid valve. The magnetic isolation sleeve adopts an integrated design. By welding the upper magnetic sleeve, the magnetic isolation ring and the lower magnetic sleeve together, the functions of multiple parts in the traditional technology are replaced, giving the magnetic isolation sleeve more diversified functions and improving the use efficiency of the parts.

[0021] The above-mentioned movable iron positioning mechanism for the shock absorber damping front-stage valve actuator can be further configured as follows: the roughness of the outer wall of the valve armature is a, the roughness of the polytetrafluoroethylene film is b, and the roughness of the inner wall of the magnetic isolation sleeve is c, wherein c>a>b.

[0022] By adopting the above technical scheme, the roughness of the inner wall of the magnetic isolation sleeve is set to be the highest, the roughness of the outer wall of the valve armature is set to be the second highest, and the roughness of the polytetrafluoroethylene film body is set to be the lowest. This structure is beneficial for the polytetrafluoroethylene film body to be positioned without slipping on one side through the magnetic isolation sleeve with the highest roughness during movement, and to form a stable lubricating oil film with the valve armature on the other side, thereby reducing the direct contact area, thereby reducing friction and wear, improving transmission efficiency, and reducing the requirements for the processing accuracy of the valve armature and the magnetic isolation sleeve.

[0023] The utility model is further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a cross-sectional schematic diagram of Example 1 of the utility model.

[0025] Figure 2 It is a cross-sectional schematic diagram of embodiment 2 of the present utility model.

[0026] Figure 3 It is a cross-sectional schematic diagram of embodiment 3 of the present utility model.

[0027] Figure 4 It is a cross-sectional schematic diagram of embodiment 4 of the present utility model. Implementation

[0028] Example 1: Figure 1As shown, a moving iron positioning mechanism for a damper damping front-stage valve actuator assembly comprises a magnetic isolation sleeve 1 with an opening at one end, a valve armature 2, a moving iron seat 3 and a front-stage valve 4. The moving iron seat 3 is fixedly installed at the opening of the magnetic isolation sleeve 1 and cooperates with the magnetic isolation sleeve 1 to form a moving iron movable chamber 10 for the valve armature 2 to move axially therein. One end of the valve armature 2 is abutted against the magnetic isolation sleeve 1 through a preload spring 5, and the other end is provided with a moving iron core 6 extending out of the moving iron seat 3 and fixedly connected to the front-stage valve 4, and the valve armature 2 is maintained at a predefined initial position through the preload spring 5. The valve armature 2 and the moving iron core 6 are integrally formed by machining to improve the overall strength. The surface of the valve armature 2 is reduced in roughness by fine machining, and then the outer circumferential surface of the valve armature 2 is made to slide against the inner wall of the magnetic isolation sleeve 1, and the valve armature 2 is provided with a spring accommodating chamber 21 for accommodating a preload spring 5 at one end away from the front-stage valve 4. One end of the preload spring 5 abuts against the magnetic isolation sleeve 1, and the other end abuts against the valve armature 2, and preloads the closing pressure on the front-stage valve 4. The valve armature 2 is provided with an axial channel 22 penetrating both ends of the valve armature 2. The axial channel 22 conducts the damping medium at both ends of the movable iron active chamber 10 to each other, forming a stable pump suction structure, giving sufficient resistance to the flow of the damping medium, so that the medium can be quickly filled or discharged when the valve armature 2 moves. The magnetic isolation sleeve 1 is composed of an upper magnetic conductive sleeve 11, a magnetic isolation ring 12 and a lower magnetic conductive sleeve 13 by welding. The upper magnetic conductive sleeve 11 and the lower magnetic conductive sleeve 13 are made of DT4C material, and the magnetic isolation ring 12 is made of copper material to achieve a stable current magnetic field.

[0029] Example 2: Figure 2 As shown, compared with Example 1, the valve armature 2 in Example 2 is fixedly connected to the moving iron core 6 through a press-fitting process, which is convenient for adapting to different application environments.

[0030] Example 3: Figure 3 As shown, compared with Example 1, in Example 3, there is a gap between the magnetic isolation sleeve 1 and the valve armature 2, and the polytetrafluoroethylene film body 7 is installed in the gap, the polytetrafluoroethylene film body 7 is sleeved on the inner wall of the magnetic isolation sleeve 1, and the outer wall of the valve armature 2 slides against the polytetrafluoroethylene film body 7, wherein the roughness of the outer wall of the valve armature 2 is a, the roughness of the polytetrafluoroethylene film body 7 is b, and the roughness of the inner wall of the magnetic isolation sleeve 1 is c, wherein c>a>b, which is beneficial for positioning the polytetrafluoroethylene film body on one side through the magnetic isolation sleeve with the highest roughness without slipping during the movement, and forming a stable lubricating oil film with the valve armature on the other side, thereby reducing the direct contact area, thereby reducing friction and wear, improving transmission efficiency, and reducing the requirements for the processing accuracy of the valve armature and the magnetic isolation sleeve.

[0031] Example 4: Figure 4 As shown, compared with Example 31, the valve armature 2 in Example 4 is fixedly connected to the moving iron core 6 through a press-fitting process, which is convenient for adapting to different application environments.

Claims

1. A movable iron positioning mechanism for a damper damping front-stage valve actuator assembly, comprising a magnetic isolation sleeve with one end open, a valve armature, a movable iron seat and a front-stage valve, wherein the movable iron seat is mounted on the magnetic isolation sleeve and cooperates with the magnetic isolation sleeve to form a movable iron movable cavity for the valve armature to move axially therein, characterized in that: One end of the valve armature is butted against the magnetic isolation sleeve through an elastic member, and the other end is provided with a moving iron core extending out of the moving iron seat and fixedly connected to the front stage valve, and the valve armature is maintained at a predefined initial position through the elastic member.

2. The movable iron positioning mechanism for the damping front-stage valve actuator of a shock absorber according to claim 1, characterized in that: The outer peripheral surface of the valve armature slides against the inner wall of the magnetic isolation sleeve, the elastic member is a preload spring, and the end of the valve armature away from the previous valve is provided with a spring accommodating chamber for accommodating the preload spring. One end of the preload spring abuts against the magnetic isolation sleeve, and the other end abuts against the valve armature, thereby applying preload closing pressure to the previous valve.

3. The movable iron positioning mechanism for the damping front-stage valve actuator of a shock absorber according to claim 2, characterized in that: The valve armature is provided with an axial channel penetrating through two ends of the valve armature, and the axial channel conducts the damping medium at two ends of the movable iron cavity to each other.

4. A movable iron positioning mechanism for a damping front-stage valve actuator assembly of a shock absorber according to any one of claims 1 to 3, characterized in that: The valve armature and the moving iron core are integrally formed.

5. A movable iron positioning mechanism for a damping front-stage valve actuator assembly of a shock absorber according to any one of claims 1 to 3, characterized in that: The valve armature is fixedly connected to the moving iron core by threading, pressing, welding or riveting.

6. A movable iron positioning mechanism for a damping front-stage valve actuator assembly of a shock absorber according to any one of claims 1 to 3, characterized in that: A polytetrafluoroethylene film body is arranged between the valve armature and the magnetic isolation sleeve. The polytetrafluoroethylene film body is sleeved on the inner wall of the magnetic isolation sleeve and abuts against the outer wall of the valve armature.

7. A movable iron positioning mechanism for a damping front-stage valve actuator assembly of a shock absorber according to any one of claims 1 to 3, characterized in that: The magnetic isolation sleeve is formed by welding an upper magnetic conductive sleeve, a magnetic isolation ring and a lower magnetic conductive sleeve. The upper magnetic conductive sleeve and the lower magnetic conductive sleeve are made of DT4C or DT4E material, and the magnetic isolation ring is made of copper or stainless steel material.

8. The movable iron positioning mechanism for a damper damping front-stage valve actuator assembly according to claim 6, characterized in that: The roughness of the outer wall of the valve armature is a, the roughness of the polytetrafluoroethylene film is b, and the roughness of the inner wall of the magnetic isolation sleeve is c, wherein c>a>b.

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