Front yoke, direct-drive electromagnetic mechanism and direct-drive electromagnetic valve

Abstract

A front yoke, a direct-drive electromagnetic mechanism and a direct-drive electromagnetic valve are characterized in that one end of the front yoke is a magnetic conductive surface, the radial outer side surface of the magnetic conductive surface inclines inwards to form a taper angle A of 40-70 degrees, the end, located on the magnetic conductive surface, of the front yoke sinks inwards to form a first groove, an annular plane D is formed at the top between the first groove and the taper angle A, the thickness of the annular plane D is 0.2-1 mm, and the thickness of the annular plane D is 0.2-1 mm. A through hole is formed along the axis of the front yoke in a penetrating mode, the other end of the front yoke is also concaved inwards to form a second groove, the first groove and the second groove are communicated through the through hole, a clamping ring is further annularly and outwards arranged on the outer wall of the front yoke in a protruding mode, and the clamping ring plays a role in being matched with the front yoke to be installed and fixed. According to the electromagnetic valve, the core problem that an existing electromagnetic valve is too high in power consumption is solved by adjusting the structure of the front yoke and collaborative optimization of a control strategy. The design of the taper angle of 40-70 degrees of the front yoke can concentrate a magnetic field, the electromagnetic force is increased to 35-60 N, high-power starting is achieved through high duty ratio control, and it is ensured that cam switching is rapidly responded.

Description

Technical Field

[0001] This invention relates to the field of solenoid valve technology, specifically to a front yoke, a direct-drive solenoid mechanism, and a direct-drive solenoid valve. Background Technology

[0002] In the transmission system of a two-wheeled motor vehicle engine, the solenoid valve is the core component for high (low) speed cam switching, and its performance directly affects the engine's operating efficiency and stability. In existing technology, this type of solenoid valve mainly consists of an electromagnetic coil assembly, a movable plunger assembly, a compression spring, a bracket, a housing, an end cap, a magnetic conductor (including a front yoke and end cap), and a sealing ring. Its working principle involves generating a magnetic field by energizing the electromagnetic coil assembly, concentrating the magnetic field using the high permeability of the magnetic conductor, and then applying electromagnetic force to the plunger assembly, driving the plunger assembly to move axially, ultimately achieving cam switching control.

[0003] However, existing solenoid valves have many technical pain points in practical applications: First, the power consumption control is unreasonable, making it difficult to balance the start-up response speed and steady-state operation power consumption. Most products need to maintain high power output continuously to ensure the working state, resulting in energy waste. Second, the design of the front yoke is flawed. The existing front yoke has a small magnetic flux area and low magnetic field utilization efficiency, which makes the electromagnetic force insufficient when the solenoid valve starts, resulting in a slow response speed and inability to quickly complete the cam switching. Summary of the Invention

[0004] The purpose of this invention is to solve the problem of high power of solenoid valves in engine transmission systems, and to propose a direct-drive solenoid valve.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A front yoke, one end of which is a magnetically conductive surface, the outer radial surface of which is inclined inward to form a cone angle A, and a first groove is formed inward at one end of the front yoke located on the magnetically conductive surface, and an annular plane D is formed at the top between the first groove and the cone angle A.

[0007] As a further aspect of the present invention, the angle of the cone angle A is 40-70°.

[0008] As a further aspect of the present invention, the thickness of the plane D is 0.2-1 mm.

[0009] This patent solves the core problem of excessive power consumption in existing solenoid valves by synergistically optimizing the front yoke structure and control strategy. During the startup phase (within 10ms), the 40°-70° cone angle design of the front yoke concentrates the magnetic field, increasing the electromagnetic force to 35-60N. High-power startup is achieved through high duty cycle control, ensuring rapid cam switching response.

[0010] A direct-drive electromagnetic mechanism further includes an electromagnetic component for generating a magnetic field when energized and an adjustment component for the interaction of the magnetic field. The electromagnetic component includes a housing and a coil assembly, the coil assembly being disposed within the housing, and the magnetically conductive surface of one end of the front yoke being inserted into the coil assembly; The adjustment assembly includes a plunger, a push rod, and a spring seat. The plunger is inserted into the coil assembly. The plunger moves and is maintained along its own axis under the action of electromagnetic force. One end of the spring seat is inserted into the plunger, and one end of the push rod is inserted into the front yoke. The push rod is coaxial with the spring seat, and a spring assembly is also provided between the spring seat and the push rod. The outer wall of the front yoke also has a ring protruding outward in an annular shape. The ring is used to cooperate with the installation and fixation of the front yoke. The top of the housing is covered with an end cover, while the bottom is supported by a bracket. The bracket is used to fix the front yoke and the coil assembly. A second washer is also provided between the front yoke and the coil assembly, while a first washer is provided between the end cover 2 and the coil assembly. The plunger assembly consists of a plunger, a spring seat, a compression spring, and a push rod.

[0011] As a further aspect of the present invention: the spring assembly includes at least two compression springs, one of which is sleeved inside the other compression spring, and the two ends of the compression spring are respectively connected to the spring seat and the push rod.

[0012] As a further aspect of the present invention: a through hole is formed along the axis of the front yoke, and the other end of the front yoke is also recessed inward to form a second groove, and the first groove and the second groove are connected through the through hole.

[0013] As a further aspect of the present invention: at least one bearing is provided in the through hole, and the push rod is inserted into the bearing.

[0014] As a further aspect of the present invention, a rear yoke is provided between the plunger and the coil assembly.

[0015] As a further aspect of the present invention: the distance between the inner wall of the first groove and the radial side of the plunger is constant.

[0016] During the steady-state phase (after 10ms), the plunger assembly is in contact with the end face of the front yoke. With the structural optimization of the front yoke, sufficient electromagnetic force can be maintained with only low duty cycle control, achieving low-power steady-state operation, significantly reducing the overall power consumption of the engine transmission system, and meeting the energy-saving requirements.

[0017] A direct-drive solenoid valve, comprising a direct-drive solenoid mechanism. Attached Figure Description

[0018] The invention will now be further described with reference to the accompanying drawings.

[0019] Figure 1 This is a cross-sectional structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the external structure of the present invention; Figure 3 This is a schematic cross-sectional view of the front yoke in this invention.

[0020] In the diagram: 1. Housing; 2. End cap; 3. Coil assembly; 4. Front yoke; 41. First groove; 42. Second groove; 43. Through hole; 5. Bracket; 6. Push rod; 7. Spring seat; 8. First spring; 9. Second spring; 10. Plunger; 11. Bearing; 12. First washer; 13. Second washer; 14. Third washer; 15. Rear yoke sleeve. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] like Figure 3 As shown, one end of the front yoke 4 is a magnetically conductive surface. The radially outer side of the magnetically conductive surface is inclined inward to form a cone angle A of 40-70°, specifically 60°. The end of the front yoke 4 located on the magnetically conductive surface is recessed inward to form a first groove 41. The top between the first groove 41 and the cone angle A forms an annular plane D with a thickness of 0.2-1mm, specifically 0.6mm. A through hole 43 is formed along the axis of the front yoke 4. The other end of the front yoke 4 is also recessed inward to form a second groove 42. The first groove 41 and the second groove 42 are connected through the through hole 43. A retaining ring is also protruding outward in an annular shape on the outer wall of the front yoke 4. The retaining ring is used to cooperate with the front yoke 4 for installation and fixation.

[0023] like Figure 1 and 2 As shown, a direct-drive electromagnetic mechanism includes the aforementioned front yoke, as well as an electromagnetic component for generating a magnetic field after being energized and an adjustment component for the interaction of the magnetic field. The electromagnetic assembly includes a housing 1 and a coil assembly 3. The coil assembly 3 is disposed inside the housing 1, and the magnetically conductive surface of one end of the front yoke 4 is inserted into the coil assembly 3. The electromagnetic component serves as the core load-bearing structure. The housing 1 is a hollow columnar structure, and the coil assembly 3 is tightly embedded inside the housing 1 to ensure the stable generation of the magnetic field after energization. The top of the housing 1 is fixed with an end cap 2 by bolts. A first washer 12 is set between the end cap 2 and the coil assembly 3 to buffer vibration and ensure sealing performance. The bottom of the housing 1 supports the bracket 5. The bracket 5 is fixedly connected to the front yoke 4 by bolts and the retaining ring to achieve the relative positioning of the front yoke 4 and the coil assembly 3. A second washer 13 is assembled between the front yoke 4 and the coil assembly 3 to further optimize the assembly sealing and structural stability.

[0024] The adjustment assembly includes a plunger 10, a push rod 6, and a spring seat 7. The plunger 10 is inserted into the coil assembly 3. One end of the spring seat 7 is inserted into the plunger 10. A rear yoke sleeve 15 is also provided between the plunger 10 and the coil assembly 3. One end of the push rod 6 is inserted into the front yoke 4. The push rod 6 is coaxial with the spring seat 7. A spring assembly is also provided between the spring seat 7 and the push rod 6.

[0025] The spring assembly includes at least two compression springs, one of which is fitted inside the other. The two ends of the compression springs are connected to the spring seat 7 and the push rod 6, respectively. This structure improves the elastic restoring force and stability of the spring assembly, ensuring rapid reset of the plunger assembly after power failure, while avoiding the fatigue and insufficient return accuracy problems of a single-spring structure. The two compression springs are a first spring 8 and a second spring 9. The first spring 8... Figure 1 The first spring is represented by a red line, and the second spring 9 is represented by a blue line.

[0026] At least one bearing 11 is provided in the through hole 43, and the push rod 6 is inserted into the bearing 11.

[0027] The adjustment component and the electromagnetic component work together. The magnetic surface of one end of the front yoke 4 is inserted into the coil assembly 3 along the axial direction. The plunger 10 is mounted on the end of the coil assembly 3 away from the front yoke 4, and a rear yoke sleeve 15 is provided between the plunger 10 and the coil assembly 3 to optimize the magnetic field conduction path. One end of the spring seat 7 is inserted into the plunger 10 with an interference fit. One end of the push rod 6 is inserted into the front yoke 4 along the through hole 43 on the axis of the front yoke 4, and the push rod 6 and the spring seat 7 are coaxially arranged. A spring assembly is assembled between the two. At least one bearing 11 is installed in the through hole 43. The push rod 6 and the inner ring of the bearing 11 are clearance fitted to ensure the smoothness of the axial movement of the push rod 6 and reduce friction loss.

[0028] After being energized, the electromagnetic component generates a magnetic flux through the radial side of the plunger 10, applying electromagnetic attraction to the plunger 10 and thus achieving axial movement of the plunger assembly. The plunger assembly consists of the plunger 10, spring seat 7, compression spring, and push rod 6. The push rod 6 transmits the electromagnetic force received by the adjusting component, providing power to the actuator on the opposite side. At the moment of energization (within 10ms), the plunger assembly is in its initial position, away from the front yoke 4, with high duty cycle control and high power consumption; after energization (after 10ms), the plunger assembly contacts the end face of the front yoke 4, and the plunger assembly is in its working position, with the electromagnetic force abruptly reaching its peak value, resulting in low duty cycle control and maintaining the working state. This patent achieves a high-power start-up, fast response, and low-power maintenance mode for the solenoid valve.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A front yoke, characterized in that, One end of the front yoke (4) is a magnetically conductive surface. The radially outer side of the magnetically conductive surface is inclined inward to form a cone angle A. The front yoke (4) is recessed inward at one end of the magnetically conductive surface to form a first groove (41). An annular plane D is formed at the top between the first groove (41) and the cone angle A.

2. The front yoke according to claim 1, characterized in that, The angle of the cone angle A is 40-70°.

3. The front yoke according to claim 1, characterized in that, The thickness of the plane D is 0.2-1 mm.

4. A direct-drive electromagnetic mechanism, characterized in that, It includes the front yoke as described in any one of claims 1 to 3, and also includes an electromagnetic component for generating a magnetic field when energized and an adjustment component for the interaction of the magnetic field. The electromagnetic component includes a housing (1) and a coil assembly (3). The coil assembly (3) is disposed inside the housing (1), and the magnetic surface of one end of the front yoke (4) is inserted into the coil assembly (3). The adjustment assembly includes a plunger (10), a push rod (6), and a spring seat (7). The plunger (10) is inserted into the coil assembly (3). One end of the spring seat (7) is inserted into the plunger (10). One end of the push rod (6) is inserted into the front yoke (4). The push rod (6) is coaxial with the spring seat (7). A spring assembly is also provided between the spring seat (7) and the push rod (6).

5. The direct-drive electromagnetic mechanism according to claim 4, characterized in that, The spring assembly includes at least two compression springs, one of which is fitted inside the other compression spring, and the two ends of the compression spring are connected to the spring seat (7) and the push rod (6) respectively.

6. The direct-drive electromagnetic mechanism according to claim 4, characterized in that, A through hole (43) is formed along the axis of the front yoke (4), and a second groove (42) is also formed at the other end of the front yoke (4). The first groove (41) and the second groove (42) are connected through the through hole (43).

7. The direct-drive electromagnetic mechanism according to claim 6, characterized in that, At least one bearing (11) is provided in the through hole (43), and the push rod (6) is inserted into the bearing (11).

8. The direct-drive electromagnetic mechanism according to claim 4, characterized in that, A rear yoke sleeve (15) is also provided between the plunger (10) and the coil assembly (3).

9. The direct-drive electromagnetic mechanism according to claim 4 is characterized in that, The distance between the inner wall of the first groove (41) and the radial side of the plunger (10) is constant.

10. A direct-drive solenoid valve, characterized in that, Includes the direct-drive electromagnetic mechanism as described in any one of claims 4 to 9.

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