Pressure proportional solenoid valve and transmission

Abstract

This invention relates to the field of solenoid valve technology, specifically to a pressure proportional solenoid valve and transmission, comprising a housing assembly and a coil assembly and a front yoke installed within the housing assembly. A valve sleeve, which fits against the front yoke, is located at the bottom of the housing assembly. The valve sleeve has oil ports distributed on its side, from top to bottom: an inlet, a control port, and a return port. Initially, the inlet and control ports are not connected, while the control port and return port are connected. During operation, the control port and return port are closed, the inlet and control port are connected, and a certain pressure is output to the control port. A recess is provided at the end of the valve sleeve near the front yoke, and a first flow channel is axially formed within the valve sleeve, communicating with the recess and the return port. This allows oil in the solenoid valve's internal cavity to enter the first flow channel through the recess and drain to the return port, preventing oil accumulation and back pressure formation within the solenoid valve's internal cavity. This ensures the solenoid valve's normal control function while preventing external leakage.

Description

Technical Field

[0001] This invention relates to the field of solenoid valve technology, specifically to a pressure proportional solenoid valve and a transmission. Background Technology

[0002] Against the backdrop of the rapid development of the automotive and motorcycle industries towards electrification, connectivity, intelligence, and sharing, higher demands are being placed on hydraulic automatic control technology. Using electromagnetic control valves to control hydraulic flow and pressure to achieve automated and intelligent system control is an important direction. As a core component, the electromagnetic valve has high requirements for materials, structure, and manufacturing processes.

[0003] Existing pressure proportional solenoid valves typically operate within a closed enclosure, with the entire valve submerged in the medium. Even if leakage occurs during operation, it does not affect their function. However, for external insertion applications, external leakage is unacceptable for solenoid valves. Simply adding a sealing ring to the existing solenoid valve structure to achieve a seal would prevent the oil inside the solenoid unit from exchanging with the outside, creating back pressure and rendering the solenoid valve uncontrollable.

[0004] In addition, current solenoid valve structures typically achieve pressure feedback through the difference in the front area of ​​the valve core. This design requires a thicker valve body, which is not conducive to the miniaturization and cost reduction of solenoid valves. Summary of the Invention

[0005] The purpose of this invention is to solve the problem that the oil in the inner cavity of the electromagnetic part of the existing pressure proportional solenoid valve cannot be discharged when achieving zero external leakage, and to propose a pressure proportional solenoid valve and a transmission.

[0006] The objective of this invention can be achieved through the following technical solutions: A pressure proportional solenoid valve includes a housing assembly and a coil assembly and a front yoke installed within the housing assembly. A valve sleeve is provided at the bottom of the housing assembly and fits against the front yoke. The oil ports of the valve sleeve are distributed on the side, from top to bottom as an oil inlet, a control oil port, and a return oil port. Initially, the oil inlet and the control oil port are not connected, while the control oil port and the return oil port are connected. During operation (i.e., when the input current is greater than a certain value), the control oil port and the return oil port are closed, the oil inlet and the control oil port are connected, and a certain pressure is output to the control oil port. The end of the valve sleeve near the front yoke is recessed inward to form a recessed portion, and the recessed portion is connected to the inner cavity of the valve sleeve. At least one first flow channel is axially extended through one side of the inner cavity of the valve sleeve, one end of the first flow channel is connected to the recessed portion, and the other end is connected to the return oil port.

[0007] By setting a recess at one end of the valve sleeve near the front yoke, and opening a first flow channel in the valve sleeve along the axial direction that connects the recess and the oil return port, the oil in the inner cavity of the solenoid part can enter the first flow channel through the recess and be discharged to the oil return port. This avoids the oil from accumulating in the inner cavity of the solenoid part without exchange, thus preventing back pressure. This ensures the normal control function of the solenoid valve while achieving no external leakage.

[0008] As a further aspect of the present invention: a second sealing ring is provided around the recess between the front yoke and the valve sleeve.

[0009] By setting a second sealing ring around the recess between the front yoke and the valve sleeve, the leakage path of the control medium along the outer wall of the valve sleeve to the inner cavity of the solenoid is effectively blocked, ensuring that the solenoid valve has no external leakage in various working environments, making the solenoid valve suitable for external insertion application scenarios.

[0010] As a further aspect of the present invention: a first sealing ring is provided at the angle where the front yoke and the coil assembly fit together.

[0011] As a further aspect of the present invention: the valve sleeve is provided with an annular oil groove at the oil inlet, the control oil port and the return oil port, and a filter screen is provided on the annular oil groove at the oil inlet and the control oil port.

[0012] As a further aspect of the present invention: the pressure proportional solenoid valve further includes a valve core disposed within a valve sleeve and a spring seat installed at one end of the valve core. The valve core has a second flow channel axially opened at one end of the spring seat, and a first through hole communicating with the second flow channel is radially opened on the valve core, and a valve core plug slides in the first through hole.

[0013] By setting a valve core plug at the front end of the valve core and forming a feedback oil chamber between the control oil port and the valve core plug, the linear proportional control of the output pressure is achieved by superimposing the feedback pressure with the spring force. The pressure feedback function can be realized without thickening the valve body, which is conducive to the miniaturization and cost reduction of the solenoid valve.

[0014] As a further aspect of the present invention: the pressure proportional solenoid valve further includes a valve core disposed within a valve sleeve and a spring seat installed at one end of the valve core. The valve core has a second flow channel axially opened at one end of the spring seat, and a first through hole communicating with the second flow channel is radially opened on the valve core. A groove is opened on the second flow channel at the end of the valve core, and a valve core plug slides in the groove. The diameter of the groove is larger than the diameter of the second flow channel.

[0015] As a further aspect of the present invention: an annular groove is also provided on the valve core at the first through hole, and the annular groove communicates with the first through hole.

[0016] As a further aspect of the present invention, the annular groove can be connected to the control oil port.

[0017] As a further aspect of the present invention: the valve sleeve and valve core are machined from aluminum alloy bars and the surfaces are subjected to hard anodizing treatment.

[0018] As a further aspect of the present invention, the upper and lower parts of the housing assembly are assembled by riveting.

[0019] As a further aspect of the present invention, the valve sleeve is provided with four oil passage holes at the oil inlet, control oil outlet and return oil outlet.

[0020] As a further aspect of the present invention: the pressure proportional solenoid valve further includes a guide sleeve and a plunger disposed within the housing assembly, the plunger and the guide sleeve being fitted into the inner hole of the coil assembly, and the plunger sliding within the guide sleeve. Attached Figure Description

[0021] The invention will now be further described with reference to the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 yes Figure 1 Cross-sectional view; Figure 3 yes Figure 2 Enlarged view of point A in the middle; Figure 4 This is a cross-sectional view of the valve sleeve. Figure 5 This is a cross-sectional view of the valve core.

[0023] In the diagram: 1. Housing assembly; 3. Coil assembly; 4. Piston; 5. Guide sleeve; 6. Front yoke; 7. Valve sleeve; 71. Recess; 72. P port; 73. A port; 74. T port; 75. First flow channel; 8. Valve core; 81. Second flow channel; 82. Groove; 83. First through hole; 84. Annular groove; 9. Valve core plug; 10. Spring seat; 11. Spring; 12. First sealing ring; 13. Second sealing ring; 14. Filter screen. Detailed Implementation

[0024] 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.

[0025] Example 1 like Figure 1 and Figure 2 As shown, a pressure proportional solenoid valve includes a housing assembly 1, a coil assembly 3, and a front yoke 6 installed within the housing assembly 1. A valve sleeve 7, which fits against the front yoke 6, is provided at the bottom of the housing assembly 1. The housing assembly 1 is a one-piece structure welded from a housing and a bracket. The housing is formed by stretching and stamping, and the bracket is formed by stamping. The surface of the housing assembly 1 is treated with zinc-nickel alloy electroplating. The upper and lower parts of the housing assembly 1 are assembled by riveting.

[0026] like Figure 1 and Figure 2 As shown, the pressure proportional solenoid valve also includes a guide sleeve 5 and a plunger 4 disposed within the housing assembly 1. The plunger 4 and the guide sleeve 5 are assembled in the inner hole of the coil assembly 3, and the plunger 4 slides within the guide sleeve 5.

[0027] like Figure 2 and Figure 4 As shown, the oil ports of the valve sleeve 7 are distributed on the side, from top to bottom as an oil inlet 72, a control oil port 73, and a return oil port 74. Each of the oil inlet 72, control oil port 73, and return oil port 74 has four oil passages, and each port also has an annular oil groove. A filter screen 14 is also installed on the annular oil grooves of the oil inlet 72 and control oil port 73, and the filter screen 14 is welded to the oil port portion on the side of the valve sleeve 7.

[0028] like Figure 2 and Figure 4 As shown, the valve sleeve 7 has an inwardly recessed portion 71 at one end near the front yoke 6, which communicates with the inner cavity of the valve sleeve 7. At least one first flow channel 75 is axially extending through one side of the inner cavity of the valve sleeve 7. One end of the first flow channel 75 communicates with the recessed portion 71, and the other end communicates with the return port 74. A second sealing ring 13 surrounds the front yoke 6 and the valve sleeve 7 around the recessed portion 71. A first sealing ring 12 is provided at the angle where the front yoke 6 and the coil assembly 3 fit together, located on one side of the guide sleeve 5. A sealing structure and a sealing ring are also provided at the upper end of the valve sleeve 7. Through the above sealing structure, the solenoid valve achieves zero external leakage.

[0029] like Figure 5 As shown, the pressure proportional solenoid valve also includes a valve core 8 disposed within a valve sleeve 7 and a spring seat 10 mounted at one end of the valve core 8. A spring 11 is installed inside the spring seat 10, and one end of the spring 11 is connected to the end of the valve core 8. The valve sleeve 7 and the valve core 8 are machined from aluminum alloy bars and their surfaces are hard anodized.

[0030] The working principle of this invention is as follows: When the solenoid valve is energized, the coil assembly 3 generates electromagnetic force, attracting the plunger 4 to move downwards. The plunger 4 pushes the valve core 8 to overcome the spring force of the spring 11 and hydraulic resistance, moving downwards as well. As the current increases, the electromagnetic force overcomes the spring force, and the oil inlet 72 and control oil port 73 begin to connect, causing the pressure in the control chamber to rise. At this time, a feedback pressure is formed between the control oil port 73 and the valve core plug 9. This feedback pressure, combined with the spring force of the spring 11, causes the opening of the control oil port 73 to increase slowly, thereby achieving continuous linear proportional control of the output pressure.

[0031] During this process, the oil inside the solenoid unit enters the first flow channel 75 through the recess 71, and then flows out to the return port 74 through the first flow channel 75, thus preventing the oil from accumulating inside the solenoid unit without exchange and forming back pressure. At the same time, because the front yoke 6 and the valve sleeve 7 are surrounded by multiple sealing structures such as the second sealing ring 13 around the recess 71, the control medium will not leak to the outside of the solenoid valve.

[0032] Example 2 The difference between this embodiment and Embodiment 1 lies in the internal structure of the valve core 8 and the mounting structure of the valve core plug 9. For example... Figure 5 As shown, a second flow channel 81 is axially formed at one end of the valve core 8 located in the spring seat 10. A first through hole 83 communicating with the second flow channel 81 is radially formed on the valve core 8. A valve core plug 9 is slidably disposed in a groove 82 on the second flow channel 81, and the diameter of the groove 82 is larger than the diameter of the second flow channel 81. This structure allows the valve core plug 9 to have greater movement space within the groove 82, which is beneficial for the smooth establishment of feedback pressure and further improves the stability and accuracy of pressure control.

[0033] An annular groove 84 is also provided on the valve core 8 near the first through hole 83, and the annular groove 84 communicates with the first through hole 83. The annular groove 84 communicates with the control oil port 73.

[0034] The remaining structure and working principle are the same as in Embodiment 1, and will not be repeated here.

[0035] Example 3 A transmission in which the solenoid valve is mounted on a valve body within the transmission or integrated into the main oil circuit.

[0036] 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 pressure proportional solenoid valve, comprising a housing assembly (1) and a coil assembly (3) and a front yoke (6) installed within the housing assembly (1), wherein a valve sleeve (7) fitted to the front yoke (6) is provided at the bottom of the housing assembly (1), and the oil ports of the valve sleeve (7) are distributed on the side, and from top to bottom are an oil inlet (72), a control oil port (73), and a return oil port (74), characterized in that, The valve sleeve (7) has a recessed portion (71) formed at one end near the front yoke (6), and the recessed portion (71) is connected to the inner cavity of the valve sleeve (7). At least one first flow channel (75) is axially opened in the valve sleeve (7) on one side of the inner cavity. One end of the first flow channel (75) is connected to the recessed portion (71), and the other end is connected to the oil return port (74).

2. The pressure proportional solenoid valve according to claim 1, characterized in that, A second sealing ring (13) is arranged around the front yoke (6) and the valve sleeve (7) around the recess (71).

3. The pressure proportional solenoid valve according to claim 1, characterized in that, A first sealing ring (12) is provided at the angle where the front yoke (6) and the coil assembly (3) fit together.

4. The pressure proportional solenoid valve according to claim 1, characterized in that, The valve sleeve (7) is provided with an annular oil groove at the oil inlet (72), the control oil port (73) and the oil return port (74), and a filter screen (14) is provided on the annular oil groove at the oil inlet (72) and the control oil port (73).

5. The pressure proportional solenoid valve according to claim 1, characterized in that, The pressure proportional solenoid valve also includes a valve core (8) disposed in a valve sleeve (7) and a spring seat (10) installed at one end of the valve core (8). The valve core (8) is provided with a second flow channel (81) axially at one end of the spring seat (10). The valve core (8) is provided with a first through hole (83) radially communicating with the second flow channel (81), and a valve core plug (9) slides in the first through hole (83).

6. The pressure proportional solenoid valve according to claim 1, characterized in that, The pressure proportional solenoid valve further includes a valve core (8) disposed in a valve sleeve (7) and a spring seat (10) installed at one end of the valve core (8). The valve core (8) is provided with a second flow channel (81) axially at one end of the spring seat (10). The valve core (8) is provided with a first through hole (83) communicating with the second flow channel (81) radially. A groove (82) is provided on the second flow channel (81) at the end of the valve core (8). A valve core plug (9) slides in the groove (82). The diameter of the groove (82) is larger than the diameter of the second flow channel (81).

7. The pressure proportional solenoid valve according to claim 5 or 6, characterized in that, The valve core (8) is provided with an annular groove (84) located at the first through hole (83), and the annular groove (84) is connected to the first through hole (83).

8. The pressure proportional solenoid valve according to claim 7, characterized in that, The annular groove (84) can be connected to the control oil port (73).

9. A transmission, characterized in that, Includes the pressure proportional solenoid valve as described in any one of claims 1 to 8.

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