Electromagnetic valve applied to gearbox

Abstract

The electromagnetic valve applied to the gearbox comprises a valve shell, a core body, a coil, a coil framework, an armature and a valve seat, the core body and the valve seat are connected to the upper end and the lower end of the valve shell respectively, the coil is wound on the outer wall of the coil framework, the armature is assembled in an inner cavity of the coil framework in the vertical direction in a sliding mode, and the valve seat is arranged on the valve shell. A spring is arranged between the upper end of the armature and the core body, the lower end of the armature is connected with a sealing block used for opening and closing a valve hole in the valve seat, an armature guide sleeve is arranged between the coil framework and the armature, the outer wall of the armature guide sleeve and the inner wall of the coil framework are integrally formed in an injection molding mode, and the inner wall of the armature guide sleeve is in sliding fit with the outer wall of the armature. The upper end of the armature guide sleeve extends to the core body, a sealing ring is arranged between the inner wall of the upper end of the armature guide sleeve and the outer wall of the core body, and the valve seat and the coil framework are of an integrated injection molding structure. The electromagnetic valve applied to the gearbox is simple in structure, small in leakage, stable in sealing and long in service life.

Description

Technical Field

[0001] The utility model relates to the field of electromagnetic valves, in particular to an electromagnetic valve used in a gearbox. Background Art

[0002] The gearbox is one of the main assemblies in the transmission system of automobiles and construction machinery; taking a forklift as an example, the actual use of the forklift is very complicated, such as starting, idling, slow or fast driving, acceleration, deceleration, climbing and reversing, etc. This requires the driving force and speed of the forklift to vary within a fairly large range, while the output torque and speed variation range of the widely used piston engine is relatively small, which requires the existence of a gearbox, and the traditional gearbox is mainly a manual gearbox. With the improvement of users' requirements for the comfort of construction machinery, the electro-hydraulic control gearbox has been rapidly developed in the domestic construction machinery industry due to its advantages of simple operation and labor saving. In the electro-hydraulic control gearbox, the shifting is achieved by combining the clutch with the electro-hydraulic control method. Among them, the solenoid valve is an extremely heavy component, and its quality and performance will directly affect the overall performance of the gearbox.

[0003] In the prior art, patent CN109073107B discloses an electromagnetically operable valve device, which has a valve housing, the valve housing is provided with a first (P) and a second (E) fluid connector for controlled opening and closing respectively by a moving closing unit and at least one other fluid connector (A) arranged on the valve housing, the other fluid connector alternately interrupts the fluid channel leading to the first or second fluid connector through the closing unit, wherein the closing unit is arranged in an armature unit that is movably guided along the longitudinal axis of movement in the valve housing and is drivable in response to the energization of a coil unit that is stationary in the valve housing, and is capable of moving between first and second opposite closing positions, the closing unit is constructed to magnetically cooperate with a stationary core unit that is at least partially surrounded by the coil unit, and the closing unit is pre-tensioned to one of the closing positions by a force storage device acting on the armature unit; the first closing position is achieved by a valve seat connected to the first fluid connector, one end of the force storage device is connected or cooperates with the armature unit and the other end is connected or cooperates with the core unit, and the force storage device is located outside the fluid channel from the second fluid connector to the other fluid connector.

[0004] In the solenoid valve structure of the above patent, an armature guide tube is arranged in the valve housing, the inner wall of the upper end of the armature guide tube is welded and fixed to the core unit, and the lower end of the armature guide tube is bent to form a limiting portion for wrapping and fixing the valve seat, thereby realizing the connection between the valve seat and the valve housing. This connection structure not only increases the structural processing difficulty of the armature guide tube, but also has the risk of leakage on the mating surface of the wrapped connection structure; and in this structure, in the process of the armature constantly moving up and down to impact the valve seat, the welding structure between the upper end of the armature guide tube and the core unit will be at risk of falling off, and the bent connection at the lower end of the armature guide tube will be at risk of breaking.

[0005] On the other hand, in order to facilitate the connection of the sealing gasket in the solenoid valve structure of this patent, a separate plastic frame is connected to the end of the armature unit close to the valve seat, a mounting hole is provided in the middle of the plastic frame, and the sealing gasket is embedded in the mounting hole. This structure has the risk of leakage and failure in the connection structure between the armature unit and the plastic frame after long-term use. Summary of the invention

[0006] The problem solved by the utility model is to provide a solenoid valve applied to a gearbox in order to overcome at least one defect in the prior art, which has simple structure, small leakage, stable sealing and long service life.

[0007] In order to solve the above problems, the utility model provides a solenoid valve applied to a gearbox, comprising a valve housing, a core body, a coil, a coil skeleton, an armature and a valve seat, the core body and the valve seat are respectively connected to the upper and lower ends of the valve housing, a valve hole is opened on the valve seat, the coil is wound on the outer wall of the coil skeleton, the armature is slidably mounted in the inner cavity of the coil skeleton along the vertical direction, a spring is arranged between the upper end of the armature and the core body, a sealing block for opening and closing the valve hole is connected to the lower end of the armature, an armature guide sleeve is arranged between the inner wall of the coil skeleton and the outer wall of the armature, the outer wall of the armature guide sleeve is injection molded as a whole with the inner wall of the coil skeleton, and the inner wall of the armature guide sleeve is slidably matched with the outer wall of the armature; the upper end of the armature guide sleeve extends to the core body, and a sealing ring is arranged between the inner wall of the upper end of the armature guide sleeve and the outer wall of the core body, and the valve seat and the coil skeleton are an integrated injection molding structure.

[0008] Compared with the prior art, the utility model has the following advantages:

[0009] In the solenoid valve structure of the present invention, the armature guide tube and the coil frame are injection molded into an integrated structure, that is, the entire coil frame and the armature guide tube serve as the supporting "keel" of the coil winding, and the structural strength is greatly improved, thereby avoiding the risk of detachment between the armature guide tube and the core body welding in the prior art; in addition, the valve seat and the coil frame are designed as an integrated structure, eliminating the connection structure of the lower end of the armature guide tube wrapping the valve seat, simplifying the processing technology, and having a higher degree of integration, thereby improving the use accuracy of the solenoid valve and eliminating the risk of leakage of the armature wire tube and the valve seat wrapping connection structure in the prior art.

[0010] As an improvement, the valve seat includes a central valve body and a connecting seat, the connecting seat is a bowl-shaped structure with an opening at the top, the open end of the connecting seat is injection-molded and connected to the lower end of the armature guide sleeve as a whole; the central valve body is formed at the center of the connecting seat, and a through hole is opened in the middle of the central valve body extending from top to bottom to form the valve hole, and a plurality of first flow channel holes are opened at the bottom of the connecting seat and are circumferentially distributed on the outside of the central valve body.

[0011] In a further improvement, the core body is provided with a second flow channel hole extending axially therethrough, and the lower end of the armature is further provided with a plurality of third flow channel holes located at the periphery of the sealing gasket and used to connect the second flow channel hole with the valve hole. In the above improved structure, the third flow channel hole is directly machined and formed on the armature, which saves parts and reduces the connection process between parts, compared with the prior art in which a plastic skeleton is provided at the lower end of the armature to machine the third flow channel hole, and eliminates the risk of leakage and failure at the connection between the plastic skeleton and the armature.

[0012] In a further improvement, the lower end of the armature guide sleeve is bent radially inward to form a first transverse reinforcement plate, and the radial inner end of the reinforcement bottom plate is bent upward to form a vertical reinforcement tube, and the first transverse reinforcement plate and the vertical reinforcement tube are both embedded and injection-molded in the valve seat, and the transverse reinforcement plate is provided with avoidance holes at positions corresponding to the first flow channel holes. In the above improved structure, the first transverse reinforcement plate and the vertical reinforcement tube are provided to fully enhance the structural strength of the lower end of the coil skeleton, ensuring that when the armature moves downward and impacts the valve seat, the valve seat and the coil skeleton will not break, thereby improving the service life.

[0013] In a further improvement, the lower end of the armature guide sleeve is bent radially outward to form a second transverse reinforcement plate, and the radial outer end of the second transverse reinforcement plate is embedded and injection-molded in the coil frame. In the above improved structure, the second transverse reinforcement plate is further provided to enhance the structural strength of the armature guide tube and the coil frame after injection molding, thereby ensuring the stability of the coil after winding.

[0014] In addition, other improved features and advantages of the utility model will be described in the subsequent specific embodiments, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be achieved and obtained through the structures specifically pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional diagram of the solenoid valve applied to the gearbox of the utility model;

[0016] Figure 2 It is a cross-sectional view of the solenoid valve applied to a gearbox of the utility model;

[0017] Figure 3 This is another structural cross-sectional view of the solenoid valve of the utility model applied to a gearbox.

[0018] Description of reference numerals:

[0019] 1. Valve body; 1.1. Outer shell; 1.2. Lower plate; 2. Core body; 3. Coil; 4. Coil frame; 5. Armature; 6. Valve seat; 6.1. Center valve body; 6.2. Connecting seat; 7. Valve hole; 8. Spring; 9. Sealing block; 10. Armature guide sleeve; 11. First flow channel hole; 12. Second flow channel hole; 13. Third flow channel hole; 14. First transverse reinforcement plate; 15. Vertical reinforcement tube; 16. Second transverse reinforcement plate. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiment of the utility model more clearly and completely described, the solenoid valve of the utility model applied to the gearbox is further described in detail below in conjunction with the accompanying drawings. Here, the schematic embodiment of the utility model and its description are used to explain the utility model. Based on the embodiment of the utility model, all other embodiments obtained by the current technicians in this field without making creative achievements are within the scope of protection of the utility model.

[0021] It should be noted here that in order to avoid obscuring the present invention due to unnecessary details, only the structures and / or processing steps closely related to the scheme according to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0022] It should be emphasized that the terms "include / comprise / have" when used herein refer to the presence of features, elements, steps or components, but do not exclude the presence or addition of one or more other features, elements, steps or components. In the description of the present utility model, it should be understood that the orientation or position relationship indicated by the terms "upper end", "lower end", "bottom", "inner wall", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present utility model and simplifying the description. The actual direction and relative position of each component may change accordingly according to the position of the observer.

[0023] like Figures 1 to 3 As shown, the utility model provides a solenoid valve applied to a gearbox, including a valve housing 1, a core body 2, a coil 3, a coil skeleton 4, an armature 5 and a valve seat 6, the core body 2 and the valve seat 6 are respectively connected to the upper and lower ends of the valve housing 1, specifically, the valve housing 1 includes a U-shaped outer shell 1.1 and a horizontal lower electrode plate 1.2, and the lower electrode plate 1.2 is horizontally connected to the opening end of the outer shell 1.1.

[0024] In addition, the coil frame 4 is connected in the housing 1.1, such as Figure 2 As shown, with the outer shell 1.1 opening downward as a reference, the upper end of the coil skeleton 4 is against the bottom wall of the outer shell 1.1, and the lower end of the coil skeleton 4 is connected to the lower pole plate 1.2; specifically, a plurality of mounting holes are opened on the lower pole plate 1.2, and the lower end of the coil skeleton 4 and the lower pole plate 1.2 are injection molded into an integrated structure, and the lower end of the coil skeleton 4 protrudes from the lower pole plate 1.2; the setting of the plurality of mounting holes in this structure makes the structure more solid after the coil skeleton 4 and the lower pole plate 1.2 are injection molded.

[0025] The coil 3 is wound on the outer wall of the coil frame 4, and a gap is left between the outer wall of the coil 3 and the inner wall of the housing 1.1. The armature 5 is slidably mounted in the inner cavity of the coil frame 4 in the vertical direction, and a spring 8 is arranged between the upper end of the armature 5 and the core 2; a valve hole 7 is provided on the valve seat 6, and a sealing block 9 for opening and closing the valve hole 7 is connected to the lower end of the armature 5; under the action of the spring 8, the lower end face of the sealing gasket is always attached to the end face of the valve hole 7 at the upper end of the valve seat 6, that is, the solenoid valve is a normally closed structure. When the coil 3 is energized, an electromagnetic force is generated inside the coil 3, driving the armature 5 to move upward to overcome the action of the spring 8, and the valve hole 7 is opened.

[0026] On the other hand, in the above structure, since the coil frame 4 is a plastic structure with limited strength, in order to increase the structural strength of the coil frame 4 and improve the wear resistance of the inner wall of the coil frame 4, an armature guide sleeve 10 is provided between the inner wall of the coil frame 4 and the outer wall of the armature 5 in this embodiment. The armature guide sleeve 10 is a metal structure with good wear resistance, and the outer wall of the armature guide sleeve 10 is injection molded as a whole with the inner wall of the coil frame 4 to ensure the strength of the connection structure of the two components, and the injection connection does not require other fasteners, and can be coated with plastic through a special mold. In addition, the inner wall of the armature guide sleeve 10 and the outer wall of the armature 5 slide together to ensure the stability of the armature 5 moving up and down, not easy to shake, and avoid noise; in order to further ensure the connection strength of the armature guide sleeve 10 and the coil frame 4, the upper end of the armature guide sleeve 10 in this structure extends to the core 2, and a sealing ring is provided between the inner wall of the upper end of the armature guide sleeve 10 and the outer wall of the core 2.

[0027] In addition, more importantly, in this embodiment, the valve seat 6 and the coil frame 4 are an integral injection-molded structure. Compared with the prior art, the connection structure between the valve seat 6 and the coil frame 4 is more secure, and when the armature 5 collides with the valve seat 6 during the downward movement, there is no risk of separation of the valve seat 6 and the coil frame 4; and compared with the welding structure of the armature guide sleeve 10 and the outer wall of the core 2 in the prior art, the plastic-molded structure of the armature guide sleeve 10 and the coil frame 4 is more secure, and there is no risk of the welding part falling off due to the downward movement of the armature 5 hitting the valve seat 6.

[0028] In summary, the solenoid valve structure of the utility model injection molds the armature 5 guide tube and the coil frame 4 into an integrated structure, that is, the entire coil frame 4 and the armature 5 guide tube serve as the supporting "keel" of the coil 3 winding, and the structural strength is greatly improved, avoiding the risk of detachment between the armature 5 guide tube and the core body 2 at the welding point in the prior art; in addition, the valve seat 6 and the coil frame 4 are designed as an integrated structure, eliminating the connection structure of the lower end of the armature 5 guide tube wrapping the valve seat 6, simplifying the processing technology, and having a higher degree of integration, thereby improving the use accuracy of the solenoid valve.

[0029] In this embodiment, the valve seat 6 includes a central valve body 6.1 and a connecting seat 6.2. The connecting seat 6.2 is a bowl-shaped structure with an upper opening. The open end of the connecting seat 6.2 is connected to the lower end of the armature guide sleeve 10 by injection molding as a whole. The central valve body 6.1 is formed at the center of the connecting seat 6.2. A through hole is opened in the middle of the central valve body 6.1 to form a valve hole 7. A plurality of first flow channel holes 11 are circumferentially distributed outside the central valve body 6.1 at the bottom of the connecting seat 6.2. At this time, the valve structure is a two-position two-way valve, such as Figure 2 shown.

[0030] In other embodiments, the core body 2 may be provided with a second flow channel hole 12 extending axially therethrough, and the lower end of the armature 5 may be provided with a plurality of third flow channel holes 13 located on the outer periphery of the sealing gasket and used to connect the second flow channel hole 12 with the valve hole 7. In this case, the entire solenoid valve structure becomes a two-position three-way valve. Figure 3 As shown. In the prior art, the electromagnetically operable valve device disclosed in patent CN11090731107B is actually a two-position three-way valve structure. In this valve structure, in order to facilitate the connection between the sealing block 9 and the armature 5, a plastic frame is provided at the lower end of the armature 5, the sealing gasket is connected to the middle part of the plastic frame, and the third flow channel hole 13 is provided on the plastic frame. Although this result reduces the difficulty in terms of processing technology, during the infinite up and down movement of the armature 5, the connection structure between the plastic firmware and the armature 5 is prone to leakage and failure risks. In the structure of this embodiment, the plastic frame is omitted, and the third flow channel structure is directly machined at the lower end of the armature 5, and a fitting hole is provided at the bottom of the armature 5, and the sealing block 9 is connected in the fitting hole. Specifically, the sealing block 9 is a rubber part, so a vulcanization process can be used to connect the sealing block 9 and the armature 5 into an integrated structure.

[0031] Regardless of whether it is a two-position two-way valve or a two-position three-way valve, the lower end of the armature guide sleeve 10 is bent radially inward to form a first transverse reinforcement plate 14, and the radial inner end of the reinforcement bottom plate is bent upward to form a vertical reinforcement tube 15. The first transverse reinforcement plate 14 and the vertical reinforcement tube 15 are both embedded and injection-molded in the valve seat 6, and avoidance through holes are opened at positions corresponding to each first flow channel hole 11 on the transverse reinforcement plate. This structural arrangement effectively increases the structural strength of the lower end of the coil skeleton 4.

[0032] Similarly, in the above structure, the lower end of the armature guide sleeve 10 is bent radially outward to form a second transverse reinforcement plate 16, and the radial outer end of the second transverse reinforcement plate 16 is embedded in the coil skeleton 4 by injection molding to further increase the overall structural strength of the coil skeleton 4 and the armature guide tube 5 after injection molding.

[0033] Although the utility model is disclosed as above, the protection scope of the utility model is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model, and these changes and modifications will fall within the protection scope of the utility model.

Claims

1. A solenoid valve used in a gearbox, comprising a valve housing (1), a core (2), a coil (3), a coil frame (4), an armature (5) and a valve seat (6), wherein the core (2) and the valve seat (6) are respectively connected to the upper and lower ends of the valve housing (1), the valve seat (6) is provided with a valve hole (7), the coil (3) is wound on the outer wall of the coil frame (4), the armature (5) is vertically slidably mounted in the inner cavity of the coil frame (4), a spring (8) is provided between the upper end of the armature (5) and the core (2), and the lower end of the armature (5) is connected to a sealing block (9) for opening and closing the valve hole (7), characterized in that: An armature guide sleeve (10) is arranged between the inner wall of the coil skeleton (4) and the outer wall of the armature (5); the outer wall of the armature guide sleeve (10) and the inner wall of the coil skeleton (4) are injection molded as a whole; the inner wall of the armature guide sleeve (10) and the outer wall of the armature (5) are slidably matched; the upper end of the armature guide sleeve (10) extends to the core body (2), and a sealing ring is arranged between the inner wall of the upper end of the armature guide sleeve (10) and the outer wall of the core body (2); the valve seat (6) and the coil skeleton (4) are an integral injection molding structure.

2. The solenoid valve used in a gearbox according to claim 1, characterized in that: The valve seat (6) comprises a central valve body (6.1) and a connecting seat (6.2); the connecting seat (6.2) is a bowl-shaped structure with an opening at the top; the open end of the connecting seat (6.2) is integrally connected to the lower end of the armature guide sleeve (10) by injection molding; the central valve body (6.1) is molded at the center of the connecting seat (6.2); a through hole extending from top to bottom is provided in the middle of the central valve body (6.1) to form the valve hole (7); and a plurality of first flow channel holes (11) circumferentially distributed outside the central valve body (6.1) are provided at the bottom of the connecting seat (6.2).

3. The solenoid valve used in a gearbox according to claim 2, characterized in that: The core body (2) is provided with a second flow channel hole (12) which penetrates along its axial direction, and the lower end of the armature (5) is also provided with a plurality of third flow channel holes (13) which are located on the outer periphery of the sealing block (9) and are used to connect the second flow channel hole (12) and the valve hole (7).

4. The solenoid valve used in a gearbox according to claim 3, characterized in that: The lower end of the armature guide sleeve (10) is bent radially inward to form a first transverse reinforcement plate (14), and the radial inner end of the first transverse reinforcement plate (14) is bent upward to form a vertical reinforcement tube (15), and the first transverse reinforcement plate (14) and the vertical reinforcement tube (15) are both embedded and injection-molded in the valve seat (6), and avoidance through holes are opened at positions on the transverse reinforcement plate corresponding to each of the first flow channel holes (11).

5. The solenoid valve used in a gearbox according to claim 4, characterized in that: The lower end of the armature guide sleeve (10) is bent radially outward to form a second transverse reinforcement plate (16), and the radial outer end of the second transverse reinforcement plate (16) is embedded and injection-molded in the coil frame (4).

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