Solenoid valve, method for assembling a solenoid valve and engine auxiliary brake system

Abstract

The present application relates to the technical field of electromagnetic valve, specifically relates to a kind of electromagnetic valve, the assembly method of electromagnetic valve and engine auxiliary brake system, including valve sleeve and the front yoke of being arranged on valve sleeve, coil is set on the front yoke, shell is set outside coil, its open end is fixed with the valve sleeve, it is characterized in that, the front yoke and between the coil and the valve sleeve still set with support, the support and the end of the front yoke away from each other extends to the outside of the shell.The present application sets support on the front yoke and extends to the outside of shell, support is no longer riveted directly on valve sleeve, avoid the direct impact of engine high-frequency vibration on the connecting portion of support and valve sleeve, effectively improve the installation reliability and service life of electromagnetic valve.

Description

Technical Field

[0001] This invention relates to the field of solenoid valve technology, specifically to a solenoid valve, a solenoid valve assembly method, and an engine auxiliary braking system. Background Technology

[0002] Solenoid valves are key actuators in engine auxiliary braking systems, controlling the on / off state of hydraulic or pneumatic circuits to switch braking functions. A typical solenoid valve includes components such as a valve sleeve, valve core, valve ball, coil, housing, yoke (front yoke / stationary core), plunger (moving core), and ejector pin. The assembly precision and connection reliability of each component directly affect the solenoid valve's response characteristics and service life.

[0003] Existing solenoid valves (such as Figure 6 As shown, bracket 15 is installed on valve sleeve 14 by riveting and is directly installed on the engine via bracket 15. The existing installation method of solenoid valve is as follows: valve sleeve, valve core and valve ball are pressed into one piece according to preset stroke parameters to form valve sleeve assembly → coil and housing assembly → plunger assembly → yoke assembly → ejector pin assembly → riveting of the pressed valve sleeve assembly → riveting of bracket and valve sleeve to close the joint → assembly of filter screen, sealing ring and dust cover.

[0004] However, the aforementioned existing technology has the following problems: First, prolonged high-frequency vibration of the engine can damage the riveting between the solenoid valve and the bracket, causing the bracket to loosen and affecting the installation reliability of the solenoid valve. Secondly, the bracket and valve sleeve need to be riveted separately, and the housing and valve sleeve also need to be riveted separately. The step-by-step riveting not only involves many procedures and low assembly efficiency, but also the repeated riveting can easily generate cumulative errors, affecting the dimensional accuracy and coaxiality of the solenoid valve. Summary of the Invention

[0005] The purpose of this invention is to solve the problems of easy damage at the riveting joint between the solenoid valve bracket and the valve sleeve, numerous assembly procedures, and insufficient connection reliability in the prior art, and to propose a solenoid valve, a solenoid valve assembly method, and an engine auxiliary braking system.

[0006] The objective of this invention can be achieved through the following technical solutions: A solenoid valve includes a valve sleeve and a front yoke disposed on the valve sleeve, a coil disposed on the front yoke, and a housing disposed outside the coil with its open end fixed to the valve sleeve. The characteristic feature is that a bracket is further disposed on the front yoke and located between the coil and the valve sleeve, and one end of the bracket away from the front yoke extends to the outside of the housing.

[0007] This invention places the bracket on the front yoke and extends it outside the housing. The bracket is no longer directly riveted to the valve sleeve, which avoids the direct impact of high-frequency engine vibration on the connection between the bracket and the valve sleeve, effectively improving the installation reliability and service life of the solenoid valve.

[0008] As a further aspect of the present invention: the bracket has a first hole that matches the diameter of the front yoke, and the bracket is fitted onto the front yoke through the first hole.

[0009] As a further aspect of the present invention: the open end of the housing has a matching opening corresponding to the bracket, and the housing passes through the opening and is fixed to the valve sleeve.

[0010] As a further aspect of the present invention: a second hole is provided at the end of the bracket that is away from the front yoke.

[0011] As a further aspect of the present invention: a through-hole is provided on the bracket corresponding to the housing, and a claw extends from the open end of the housing corresponding to the through-hole, the claw passing through the through-hole and fixing to the valve sleeve.

[0012] A method for assembling a solenoid valve includes assembling a plunger inside a coil and assembling a front yoke inside the coil, and assembling a bracket at the opening at the end of the housing after assembling the plunger and before assembling the front yoke.

[0013] The detailed assembly method of the solenoid valve includes the following steps: The valve sleeve, valve core, and valve ball are press-fitted together according to preset stroke parameters to form a valve sleeve assembly; Assemble the coil with the housing; The plunger is assembled into the housing; The bracket is fitted to the opening at the end of the housing with a clearance fit; The front yoke is assembled with the bracket and the valve sleeve through a clearance fit. Assemble the ejector pin; After assembling the valve sleeve assembly formed in step one, it is riveted and fixed to the housing in one step. Assemble the filter screen, first sealing ring, second sealing ring, and dust cover.

[0014] This invention adopts a one-step riveting structure. After assembling the valve sleeve assembly, the fixed connection between the housing and the valve sleeve, and between the housing and the bracket, can be completed simultaneously through one riveting. Compared with the existing solenoid valve, which requires the bracket to be riveted after the housing is riveted, we provide a one-step riveting structure and method, which only requires the bracket to be riveted to the solenoid valve as a whole, and the fixed connection can be achieved in one step.

[0015] As a further aspect of the present invention: the bracket is assembled with the housing through a clearance fit, and the bracket has a first hole that matches the diameter of the front yoke, and the bracket is sleeved on the front yoke through the first hole.

[0016] As a further aspect of the present invention: the front yoke, the bracket, and the valve sleeve are all clearance fit. Attached Figure Description

[0017] The invention will now be further described with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 yes Figure 1 Top view; Figure 3 yes Figure 1 Cross-sectional structural diagram; Figure 4 This is a structural diagram of the shell; Figure 5 This is a structural diagram of the support frame; Figure 6 This is a cross-sectional view of a solenoid valve in the prior art.

[0019] In the diagram: 1. Dust cover; 2. Housing; 3. Plunger; 4. Coil; 5. Front yoke; 6. Bracket; 61. First hole; 62. Insertion hole; 63. Second hole; 7. Ejector pin; 8. Valve core; 9. First sealing ring; 10. Valve sleeve; 11. Valve ball; 12. Second sealing ring; 13. Filter screen; Detailed Implementation 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.

[0020] Example 1, as Figures 1 to 5 As shown, the present invention provides a solenoid valve, including a dust cover 1, a housing 2, a plunger 3, a coil 4, a front yoke 5, a bracket 6, a pin 7, a valve core 8, a first sealing ring 9, a valve sleeve 10, a valve ball 11, a second sealing ring 12, and a filter screen 13.

[0021] Among them, the dust cover 1, plunger 3, coil 4, ejector pin 7, valve core 8, two sealing rings, valve sleeve 10, valve ball 11 and filter screen 13 are all existing mature technologies, and will only be briefly introduced below.

[0022] The valve sleeve 10 has a hollow cylindrical structure. The valve core 8 and valve ball 11 are sequentially arranged inside the valve sleeve 10. The valve core 8 and valve ball 11 are pressed into the valve sleeve 10 according to a preset stroke to form a valve sleeve assembly. A front yoke 5 is fitted on the upper end of the valve sleeve 10 (i.e., the end away from the valve ball 11). The front yoke 5 has a ring-shaped structure, and its inner diameter is adapted to the outer diameter of the valve sleeve 10. A coil 4 is fitted on the front yoke 5. The coil 4 is an electromagnetic coil, which is used to generate electromagnetic force to drive the plunger 3 to move when energized.

[0023] The housing 2 has a cylindrical structure and is fitted over the coil 4 to protect and position the coil 4. The lower end (i.e., the open end) of the housing 2 is riveted to the valve sleeve 10. Specifically, the open end of the housing 2 has an opening that matches the bracket 6 at the corresponding location. The housing 2 passes through the bracket 6 through this opening and is then riveted to the valve sleeve 10.

[0024] The bracket 6 is fitted onto the front yoke 5 and located between the coil 4 and the valve sleeve 10. The bracket 6 has a first hole 61 that matches the diameter of the front yoke 5, through which the bracket 6 is fitted onto the front yoke 5. The end of the bracket 6 furthest from the front yoke 5 extends outside the housing 2 for mounting the solenoid valve to external equipment such as an engine. The end of the bracket 6 furthest from the front yoke 5 also has a second hole 63 for fasteners such as mounting bolts to pass through, thus securing the bracket 6 to the external equipment.

[0025] The bracket 6 has a through-hole 62 corresponding to the housing 2. A locking claw extends from the open end of the housing 2 corresponding to the through-hole 62. The locking claw passes through the through-hole 62 and is riveted to the valve sleeve 10 for fixation. The positioning and connection between the housing 2 and the bracket 6 are achieved through the cooperation of the locking claw and the through-hole 62.

[0026] The plunger 3 is located inside the housing 2 and above the front yoke 5. The plunger 3 is a moving iron core and can move axially under the action of electromagnetic force. The ejector pin 7 is located inside the valve sleeve 10. One end of the ejector pin 7 abuts against or connects to the plunger 3, and the other end corresponds to the valve ball 11. It is used to push the valve ball 11 under the drive of the plunger 3 to realize the opening or closing of the valve.

[0027] The first sealing ring 9 is disposed between the valve sleeve 10 and the housing 2 to achieve a seal between the two. The second sealing ring 12 is disposed at the lower end of the valve sleeve 10 to achieve a seal when the solenoid valve is connected to an external pipeline. The filter screen 13 is disposed at the oil inlet or outlet of the valve sleeve 10 to filter impurities in the medium. The dust cover 1 is fitted over the upper exterior of the housing 2 for dust prevention and protection.

[0028] Example 2: An assembly method for a solenoid valve Valve sleeve assembly press-fitting: Place the valve sleeve 10 in the lower positioning fixture of the press-fitting equipment, ensuring that the axis of the valve sleeve 10 is coaxial with the axis of the press head of the press-fitting equipment. Install the valve core 8 into the valve sleeve 10, and then place the valve ball 11 in the corresponding installation position of the valve core 8. Start the press-fitting equipment, and the press head descends to press the valve core 8 and valve ball 11 into the preset positions within the valve sleeve 10 in sequence, so that the valve sleeve 10, valve core 8, and valve ball 11 are press-fitted into a single unit according to the preset stroke parameters, forming a valve sleeve assembly. During the press-fitting process, the press-fitting stroke is monitored in real time by a displacement sensor to ensure that the press-fitting displacement reaches the preset stroke value. After press-fitting is completed, check the axial dimensions and coaxiality of the valve sleeve assembly.

[0029] Coil and housing assembly: Insert coil 4 into the coil mounting cavity of housing 2 in the preset direction, ensuring that the axis of coil 4 coincides with the central axis of housing 2. After coil 4 is installed in place, it is circumferentially positioned by the positioning structure on the inner wall of housing 2.

[0030] Plunger assembly: Insert plunger 3 into housing 2 along the axial hole of housing 2. As a moving part, plunger 3 must be assembled to ensure that there is no scraping between its outer surface and the inner wall of housing 2. After being inserted, plunger 3 should be able to slide smoothly in the inner hole of housing 2.

[0031] Bracket Assembly: The bracket 6 is assembled to the opening at the end of the housing 2 using a clearance fit. Specifically, the bracket 6 is fitted onto the open end of the housing 2, so that the insertion hole 62 of the bracket 6 corresponds to the claw at the open end of the housing 2. The bracket 6 is fitted onto the front yoke 5 through the first hole 61, and the end of the bracket 6 away from the front yoke 5 extends outside the housing 2. The clearance fit tolerance must meet the requirements of the design drawings to ensure smooth assembly while meeting positioning accuracy.

[0032] Front yoke assembly: The front yoke 5 is assembled with the bracket 6 and the valve sleeve 10 using a clearance fit. Specifically, the front yoke 5 is passed sequentially through the first hole 61 of the bracket 6 and the corresponding part of the valve sleeve 10, so that the front yoke 5 is fitted onto the valve sleeve 10. The front yoke 5, bracket 6, and valve sleeve 10 all have clearance fits, and the coaxiality of the three components needs to be checked after assembly.

[0033] Ejector pin assembly: Insert the ejector pin 7 axially into the corresponding hole in the valve sleeve assembly, ensuring that the tip of the ejector pin 7 corresponds to the position of the valve ball 11. During the assembly of the ejector pin 7, avoid bumping or damaging its working surface.

[0034] Finally, the final step is riveting.

[0035] The pre-assembled valve sleeve assembly is then attached to the main body, forming an assembly relationship between the valve sleeve assembly and components such as the housing 2, bracket 6, and front yoke 5. Subsequently, the assembled semi-finished product is placed in the tooling fixture of the riveting equipment. Pressure is applied to the open end of the housing 2 using the riveting equipment, causing the claws at the open end of the housing 2 to pass through the insertion hole 62 of the bracket 6 and be riveted to the valve sleeve 10. This simultaneously completes the one-step riveting fixation of the housing 2 to the valve sleeve 10 and the housing 2 to the bracket 6. During the riveting process, a pressure sensor monitors the riveting force to ensure consistent riveting quality.

[0036] Final accessory assembly: Install the filter screen 13 at the oil inlet or outlet of the valve sleeve 10; install the first sealing ring 9 in the sealing groove between the valve sleeve 10 and the housing 2; install the second sealing ring 12 in the sealing groove at the lower end of the valve sleeve 10; and finally, place the dust cover 1 on the upper exterior of the housing 2. When installing the sealing rings, ensure they are not twisted or damaged. After all accessories are installed, perform a visual inspection and performance test.

[0037] According to the stroke, press the valve sleeve, valve core, and valve ball together (valve sleeve assembly) → assemble the coil with the housing → assemble the plunger → assemble the bracket and assemble it with the housing through clearance fit → assemble the front yoke and clearance fit with the bracket and valve sleeve → assemble the ejector pin → rivet it with the pressed valve sleeve assembly → assemble the filter screen, sealing ring, and dust cover.

[0038] In embodiment three, the present invention also provides an engine auxiliary braking system, including the solenoid valve described in embodiment one. The solenoid valve is mounted on a corresponding mounting position on the engine via a bracket 6. A second hole 63 is provided on the bracket 6 for mounting bolts to pass through and fix the solenoid valve to the engine. The lower end of the valve sleeve 10 of the solenoid valve is connected to the hydraulic or pneumatic circuit of the engine. The action of the plunger 3 is controlled by the on / off state of the coil 4, which in turn drives the plunger 7 and the valve ball 11 to switch the circuit on / off, thereby realizing the engine auxiliary braking function.

[0039] Because the bracket 6 is fitted onto the front yoke 5 instead of being directly mounted on the valve sleeve 10, the high-frequency vibration of the engine is transmitted to the front yoke 5 and the housing 2 through the bracket 6, rather than acting directly on the connection between the valve sleeve 10 and the bracket 6, effectively avoiding vibration damage at the bracket connection. At the same time, the one-step riveting structure ensures the reliability and coaxiality of the connection between the various components of the solenoid valve.

[0040] 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 solenoid valve, comprising a valve sleeve (10) and a front yoke (5) disposed on the valve sleeve (10), a coil (4) sleeved on the front yoke (5), and a housing (2) sleeved outside the coil (4), the open end of which is fixed to the valve sleeve (10), characterized in that, A bracket (6) is also fitted on the front yoke (5) and located between the coil (4) and the valve sleeve (10), with one end of the bracket (6) extending away from the front yoke (5) to the outside of the housing (2).

2. The solenoid valve according to claim 1, characterized in that, The bracket (6) has a first hole (61) that matches the diameter of the front yoke (5), and the bracket (6) is fitted onto the front yoke (5) through the first hole (61).

3. The solenoid valve according to claim 1 or 2, characterized in that, The housing (2) has an opening at the opening end corresponding to the bracket (6), and the housing (2) passes through the bracket (6) through the opening and is fixed to the valve sleeve (10).

4. The solenoid valve according to claim 1, characterized in that, The bracket (6) has a second hole (63) at one end away from the front yoke (5).

5. The solenoid valve according to any one of claims 1 to 4, characterized in that, The bracket (6) has a through hole (62) corresponding to the housing (2). The opening end of the housing (2) has a claw extending from the through hole (62). The claw passes through the through hole (62) and is fixed to the valve sleeve (10).

6. A method for assembling a solenoid valve, comprising assembling a plunger inside a coil and assembling a front yoke inside the coil, characterized in that, After assembling the plunger and before assembling the front yoke, the bracket must be assembled at the opening at the end of the housing.

7. An engine auxiliary braking system, characterized in that, Applied to the solenoid valve as described in any one of claims 1 to 5.

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