Inner plunger of electromagnetic valve assembly for clutch of automobile differential and manufacturing method thereof

Abstract

An inner plunger of a clutch solenoid valve assembly for an automobile differential and a manufacturing method thereof. The present invention provides an inner plunger of a clutch solenoid valve assembly for an automobile differential, which contributes to the lightweight and cost saving of the solenoid valve assembly. The inner plunger has a diversified shape and reduces the friction with the inner shell and improves the function. The inner plunger of the clutch solenoid valve assembly for an automobile differential of the present invention is composed of an outer wheel of the inner plunger combined with a winding tube constituting the solenoid valve assembly and an inner wheel combined with the inner shell. The inner wheel is molded from an insulating synthetic resin with excellent moldability. A magnetic metal is inserted as an outer wheel on the outer edge of the inner wheel composed of the synthetic resin constituting the inner plunger, and a bottom cut groove is formed inside the entire inner wheel to reduce the friction between the inner wheel composed of the synthetic resin and the inner shell.

Description

Technical Field

[0001] The present invention relates to an inner plunger of a coil assembly of a clutch solenoid valve of an automobile differential and a manufacturing method thereof, and more specifically to an inner plunger which improves the quality and productivity of the inner plunger constituting the clutch solenoid valve assembly and realizes lightweight, and a manufacturing method thereof. Background Art

[0002] As is known to all, the differential of a car distributes the driving force of the engine differently according to the resistance of the wheels on both sides. A differential case is rotatably arranged inside a storage rack. The differential case is composed of a spyder having a pinion and a side gear meshing with both sides of the pinion. The side gears on both sides are connected to the hubs of the wheels through a drive shaft, thereby transmitting the engine power.

[0003] In the differential of an automobile that performs the functions described above, a solenoid valve assembly that performs the function of operating the clutch utilizes the magnetic force generated by the coil assembly internally to operate the outer plunger and the inner plunger or piston to connect or disconnect the differential locking device.

[0004] When explaining the structure of the inner plunger of the clutch solenoid valve assembly of the differential that performs the existing described function, the inner wheel of the inner plunger tightly connected to the inner shell is made of stainless steel so as not to be affected by magnetic force and move, and the outer wheel is made of magnetic metal for forming the electromagnetic force of the coil.

[0005] As described above, in order to avoid generating magnetic force on the inner wheel and to form magnetic force on the outer wheel, two metals of different materials are formed into one body, and the two metals are welded to each other through this method, or precision processing is required through precision processing technology in each step, and therefore, there is a disadvantage of high manufacturing cost.

[0006] In particular, the inner wheel and the outer wheel of the inner plunger are entirely made of metal, and thus are very heavy.

[0007] Therefore, there is a disadvantage of running counter to the lightweight of the vehicle and reducing the function of the solenoid valve assembly. In the case of stainless steel, due to poor formability, the shape of the inner plunger can only be limited, and there are many problems in the structure of the inner plunger.

[0008] Prior art literature

[0009] Patent Literature

[0010] Korean Patent Publication No. 10-1983-0003671 (published on June 22, 1983)

[0011] Korean registered patent No. 10-1660641 (registered on September 21, 2016) Summary of the invention

[0012] Technical problem to be solved by the invention

[0013] In order to solve the above-mentioned problems, the purpose is to provide an inner plunger. The inner plunger of the clutch solenoid valve assembly of the automobile differential of the present invention contributes to the lightweight and cost saving of the solenoid valve assembly, and the shape of the inner plunger is diversified and the friction with the inner shell is reduced to enhance the function of the solenoid valve assembly.

[0014] Technical solutions to solve problems

[0015] In order to achieve the above object, the inner plunger of the electromagnetic valve assembly for automobile differential clutch of the present invention is composed of an outer wheel of the inner plunger combined with a bobbin constituting the electromagnetic valve assembly and an inner wheel combined with an inner shell.

[0016] The inner ring of the inner plunger constructed as described above is molded from an insulating synthetic resin having excellent moldability, and a magnetic metal is inserted into the outer edge of the inner ring made of the synthetic resin constituting the inner plunger to serve as an outer ring.

[0017] An undercut groove is formed inside the entire inner wheel to reduce the friction between the inner wheel made of the synthetic resin and the inner shell.

[0018] A method for manufacturing an inner plunger of a clutch solenoid valve assembly comprises a mold consisting of a space for an outer wheel in which an inner plunger is inserted and a space for forming an inner wheel, and a magnetic core having an undercut groove forming portion for reducing friction with an inner shell so as to form an undercut groove inside the entire inner wheel.

[0019] The present invention is characterized in that an outer wheel made of magnetic metal is arranged in the space for the outer wheel of the insert inner plunger in the mold thus constructed, a magnetic core having a bottom cut groove forming portion is combined in the middle of the mold, and the inner wheel is formed by non-magnetic synthetic resin by injection molding, thereby manufacturing the inner plunger.

[0020] Effects of the Invention

[0021] As described above, according to the present invention, the inner wheel of the inner plunger constituting the solenoid valve assembly is made of synthetic resin, and the outer wheel is made of magnetic metal, thereby improving the productivity of the solenoid valve assembly and promoting cost saving.

[0022] Furthermore, the invention has the following effects: various shapes of the inner plunger can be formed, and the inner plunger can be lightweight to reduce the friction with the inner shell, thereby improving the quality of the solenoid valve assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A perspective view showing the structure of the inner plunger of the present invention;

[0024] Figure 2 A cross-sectional view showing the structure of the inner plunger of the present invention;

[0025] Figure 3 A partial cross-sectional view showing a state in which the inner plunger of the present invention is provided;

[0026] Figure 4 A partial cross-sectional view showing a mold for manufacturing the inner plunger of the present invention;

[0027] Figure 5 This is a partial cross-sectional view showing a state in which the inner plunger of the present invention is molded.

[0028] Description of Reference Numerals

[0029] 1: Inner plunger

[0030] 2: Inner wheel

[0031] 2-1: Bottom cut groove

[0032] 3: Outer wheel

[0033] 10: bobbin DETAILED DESCRIPTION

[0034] Below, the inner plunger and the manufacturing method thereof of the present invention are described in more detail. The description is based on an embodiment of the present invention. The technical idea pursued by the present invention is not limited by the form recorded in this document, but should be understood as including various modifications, equivalents and / or alternatives of the embodiments of the present invention.

[0035] Furthermore, when describing the embodiments of the present invention, even if the effects of the structures of the present invention are not explicitly described, the effects predicted by the corresponding structures should be affirmed.

[0036] The structure of the inner plunger of the clutch solenoid valve assembly for the automobile differential of the present invention will be described in detail below with reference to the accompanying drawings.

[0037] Reference Figures 1 to 3The inner plunger 1 of the clutch solenoid valve assembly of the present invention includes: an outer wheel 3 of the inner plunger, which constitutes the solenoid valve assembly and is combined with a winding tube 10 to form an electromagnetic force; an inner wheel 2, which is integrally formed with the outer wheel 3 and combined with the inner shell 20. The inner plunger 1 thus formed plays a role of reciprocating in the inner shell 20 through the electromagnetic force formed on the winding tube 10.

[0038] The inner ring 2 of the inner plunger 1 constructed as described above is molded from an insulating synthetic resin having excellent moldability, and a magnetic metal is inserted as an outer ring 3 at the outer edge of the inner ring 2 made of the synthetic resin constituting the inner plunger.

[0039] As described above, when the inner wheel 2 made of synthetic resin reciprocates along the inner shell 20, the undercut groove 2-1 is formed on the inside of the entire inner wheel 2 to reduce the friction with the inner shell 20.

[0040] Unexplained reference numeral 10 - 1 in the drawings denotes a coil.

[0041] The manufacturing method of the inner plunger of the clutch electromagnetic valve assembly of the present invention is carried out by die and insert molding.

[0042] pass Figure 4 and Figure 5 Next, a mold for insert molding the inner plunger will be described.

[0043] It is composed of a mold 30 and a magnetic core 40, wherein the mold 30 is composed of a space 30-1 for the outer wheel 3 of the inner plunger and a space 30-2 for forming the inner wheel 2; the magnetic core 40 has a bottom cut groove forming part 40-1, so that the bottom cut groove 2-1 is formed inside the entire inner wheel 2 to reduce friction with the inner shell 20.

[0044] The inner plunger is insert-molded in the mold 30 constructed in this manner.

[0045] First, in the mold 30, an outer wheel 3 made of magnetic metal is set in the space 30-1 for the outer wheel 3 of the insert inner plunger, a magnetic core 40 with a bottom cut groove forming portion 40-1 is combined in the middle of the mold 30, an inner wheel 2 is formed of a non-magnetic synthetic resin by synthetic resin injection molding, and the inner plunger 1 is manufactured by demolding.

[0046] The function of the inner plunger of the clutch solenoid valve assembly for the automobile differential of the present invention constructed as above is specifically described as follows.

[0047] First, the basic function of the clutch solenoid valve assembly for the automobile differential is explained.

[0048] In a state where the inner housing 20 is mounted on a vehicle differential and constitutes the differential, when the operation of the differential is required, electricity is supplied to the bobbin 10 to generate electromagnetic force.

[0049] Thus, the inner plunger 1 moves along the inner housing 20 due to the magnetic force generated by the magnetic field generated in the bobbin 10 .

[0050] The above-mentioned function is a general function of the clutch solenoid valve assembly for an automobile differential, and the specific description is omitted, and only the function of the structure of the inner plunger is described.

[0051] First, when the inner plunger 1 moves along the inner shell 20 due to the electromagnetic force generated by the magnetic field generated by the winding tube 10, the inner wheel 2 constituting the inner plunger 1 is made of synthetic resin, thereby reducing the influence of the electromagnetic force and improving the responsiveness, thereby helping the inner plunger 1 to move along the inner shell 20.

[0052] In particular, the inner wheel 2 is made of a non-magnetic synthetic resin, and, more simply, a bottom cut groove 2-1 is formed inside the entire inner wheel 2, thereby reducing friction with the inner shell 20 when moving back and forth along the inner shell 20. As a result, the inner plunger is freed from frictional resistance and plays a role in helping to reciprocate along the inner shell 20.

[0053] Furthermore, since the inner wheel 2 of the inner plunger is formed of a non-magnetic synthetic resin, the shape of the inner plunger can be diversified due to its excellent moldability, thereby improving the function and productivity of the shape of the inner plunger.

[0054] A magnetic metal is inserted into the outer edge of the inner wheel 2 of the inner plunger as the outer wheel 3, thereby preventing mutual demolding and maintaining the shape for a long time.

[0055] Furthermore, since the outer ring 3 is formed of a magnetic metal inserted into the outer edge of the inner ring 2 of the inner plunger, the electromagnetic force generated in the bobbin 10 is not lost, and thus the inner plunger operates smoothly.

Claims

1. A method for manufacturing an inner plunger of a clutch electromagnetic valve assembly for an automobile differential, the inner plunger comprising an outer wheel (3) combined with a bobbin (10) for forming electromagnetic force; and an inner wheel (2) formed integrally with the outer wheel and combined with an inner shell (20), the inner plunger having a function of reciprocating in the inner shell (20) by the electromagnetic force formed on the bobbin (10), the inner plunger being characterized in that: The inner wheel (2) is formed of an insulating synthetic resin, which not only diversifies the shape of the inner plunger but also reduces its weight. An undercut groove (2-1) is formed inside the entire inner wheel (2) to reduce friction with the inner shell (20) when the inner wheel (2) made of the synthetic resin reciprocates along the inner shell (20). The outer wheel (3) is provided with an insert made of a magnetic metal at the outer edge of the inner wheel (2). The method for manufacturing the inner plunger of the clutch electromagnetic valve assembly for the automobile differential comprises the following steps: A mold (30) and a magnetic core (40) are prepared, wherein the mold (30) is composed of a space (30-1) for an outer wheel (3) for inserting an inner plunger and a space (30-2) for forming an inner wheel (2); the magnetic core (40) has an undercut groove forming portion (40-1) protruding toward the space (30-2) for forming the inner wheel (2), so that the undercut groove (2-1) is formed inside the entire inner wheel (2) to reduce friction with the inner shell (20); In a mold (30), an outer wheel (3) made of magnetic metal is arranged in a space (30-1) for inserting an outer wheel (3) of an inner plunger, a magnetic core (40) having an undercut groove forming portion (40-1) is combined in the middle of the mold (30), and an inner wheel (2) having the outer wheel (3) inserted in the outer edge is molded from a non-magnetic synthetic resin by synthetic resin injection molding and demolded. Thus, a magnetic metal is embedded as an outer wheel (3) at the outer edge of the inner wheel (2) made of synthetic resin constituting the inner plunger, and when the electromagnetic force generated by the magnetic field generated by the winding tube (10) plays a role in moving the inner plunger along the inner shell (20), the influence of the electromagnetic force can be reduced, and the shape of the inner plunger can be diversified.

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