JP2022127874A - Inner plunger of solenoid assembly for automobile differential clutch, and its manufacturing method - Google Patents

Abstract

To provide an inner plunger capable of contributing on reduction of weight of a solenoid assembly and cost reduction, achieving diversification of shapes of the inner plunger, and improving functions of the solenoid assembly by reducing friction force to an inner housing.SOLUTION: An inner plunger is composed of an outer ring of the inner plunger to which a coil bobbin constituting a solenoid assembly is connected, and an inner ring connected to an inner housing, the inner ring is molded from an insulator synthetic resin having excellent moldability, a magnetic metal as the outer ring is inserted to an outer peripheral edge of the inner ring made of the synthetic resin constituting the inner plunger, and an undercut groove is formed on the inner ring made of the synthetic resin, entirely on the inner surface of the inner ring to reduce friction with the inner housing.SELECTED DRAWING: Figure 2

Description

TECHNICAL FIELD The present invention relates to an inner plunger of a coil assembly for a solenoid for an automobile differential device clutch and a method of manufacturing the same, and more particularly, to improve the quality and productivity of the inner plunger that constitutes the solenoid assembly for the clutch. The present invention relates to an inner plunger configured to be able to reduce the weight of the inner plunger and a method for manufacturing the inner plunger.

As is well known, the differential device of an automobile is constructed to distribute the driving force of the engine differently according to the resistance applied to the wheels on both sides. ;differential case) is provided in a rotatable state, a spider with a pinion inside the differential case, and a side gear that meshes with both sides of the pinion. , the side gears on both sides and the hub of the wheel are connected by a drive shaft to transmit the power of the engine.

In the automotive differential device that functions as described above, a solenoid assembly that functions to operate a clutch has an outer plunger ( Actuates an outer plunger and an inner plunger or piston to install or disengage the differential gear lock device.

Regarding the structure of the conventional inner plunger that constitutes the solenoid assembly for the clutch of the differential device that operates as described above, the inner ring of the inner plunger, which is tightly coupled to the inner housing, is affected by magnetic force. It is made of stainless steel so that it can be moved without straining, and the outer ring is made of magnetic metal so that the electromagnetic force of the coil can be formed.

As described above, in order to prevent the magnetic force from reaching the inner ring and to allow the magnetic force to be formed in the outer ring, different kinds of metals made of different materials were integrally constructed. have to be welded together and precisely machined through various stages of precision machining processes, which entails high manufacturing costs.

In particular, since the inner ring and the outer ring of the inner plunger are entirely made of metal, the weight is inevitably increased.

Therefore, it goes against the weight reduction of automobiles and has the disadvantage of lowering the function of the solenoid assembly. In the case of stainless steel, it is inferior in moldability, so the shape of the inner plunger cannot be manufactured without restrictions. There was a big problem with the structure of the inner plunger, such as unavoidable.

Korean Patent Publication No. 10-1983-0003671 (published on June 22, 1983) Korean Patent No. 10-1660641 (Registered on September 21, 2016)

The inner plunger of the solenoid assembly for the differential device clutch of the present invention for solving the above problems contributes to the weight reduction and cost reduction of the solenoid assembly, and diversifies the shape of the inner plunger. It is therefore an object of the present invention to provide an inner plunger capable of improving the function of a solenoid assembly by reducing the frictional force with the inner housing.

An inner plunger of a solenoid assembly for an automotive differential device clutch according to the present invention for achieving the above object comprises an outer ring to which a coil bobbin constituting the solenoid assembly is connected, and an inner ring to which an inner housing is connected. and consists of

The inner ring of the inner plunger having the structure described above is molded from an insulating synthetic resin with excellent moldability. is inserted.

An undercut groove is formed on the entire inner surface of the synthetic resin inner ring so as to reduce friction with the inner housing.

A method of manufacturing an inner plunger for a clutch solenoid assembly can reduce friction between a mold configured with a space for inserting the outer ring of the inner plunger and a space for forming the inner ring and the inner housing. preparing a core with an undercut molding so that an undercut groove can be formed on the entire inner surface of the inner ring.

A magnetic metal outer ring is put in the space for inserting the outer ring of the inner plunger in the mold with such a structure, a core with an undercut molding part is combined in the middle of the mold, and a non-magnetic material is injected. It is a feature of the present invention to manufacture the inner plunger by forming the inner ring from a synthetic resin.

As described above, according to the present invention, the inner ring of the inner plunger that constitutes the solenoid assembly is made of synthetic resin, and the outer ring is made of magnetic metal. It can contribute to improvement of performance and cost reduction.

In addition, the shape of the inner plunger can be diversified, the weight can be reduced, and the frictional force with the inner housing can be reduced, so the quality of the solenoid assembly can be improved. has the effect of being able to

1 is a perspective view showing the configuration of an inner plunger according to the present invention; FIG. Sectional drawing which shows the structure of the inner plunger by this invention. FIG. 4 is a cross-sectional view showing a part of the state where the inner plunger according to the present invention is provided; FIG. 2 is a cross-sectional view showing part of a mold for manufacturing an inner plunger according to the present invention; FIG. 4 is a cross-sectional view showing a part of the state in which the inner plunger according to the present invention is molded;

The inner plunger and the manufacturing method thereof according to the present invention will be described in more detail below, but such description is based on the embodiments for realizing the present invention, and does not reflect the technical idea pursued by the present invention. The embodiments described in this document are not intended to be limited to the forms described, but include various modifications, equivalents and/or alternatives of the embodiments of the invention. .

In addition, while describing the embodiments of the present invention, even if the effects associated with the configuration of the present invention are not explicitly described and explained, the effects that can be predicted by the configuration should also be recognized. It goes without saying.

Hereinafter, the configuration of the inner plunger of the solenoid assembly for an automotive differential device clutch according to the present invention will be described with reference to the accompanying drawings.

Referring to FIGS. 1 to 3, an inner plunger 1 of the clutch solenoid assembly of the present invention comprises an outer ring 3 of the inner plunger to which a coil bobbin 10 forming an electromagnetic force is coupled. , and an inner ring 2 integrally formed with the outer ring 3 and coupled to an inner housing 20 . acts to reciprocate in

The inner ring 2 of the inner plunger 1 configured as described above is molded from an insulating synthetic resin having excellent moldability. is inserted as the outer ring 3.

In the synthetic resin inner ring 2 as described above, an undercut groove 2-1 is formed on the entire inner surface of the inner ring 2 so as to reduce friction with the inner housing 20 when reciprocating along the inner housing 20. become.

In the figure, an unexplained reference numeral 10-1 means a coil.

The method of manufacturing the inner plunger of the clutch solenoid assembly according to the present invention is performed by insert molding with a mold.

A mold for insert-molding the inner plunger will be described with reference to FIGS. 4 and 5. FIG.

An undercut is provided to reduce friction between the mold 30, which is composed of a space 30-1 for inserting the outer ring 3 of the inner plunger and a space 30-2 for forming the inner ring 2, and the inner housing 20. and a core 40 with an undercut forming portion 40-1 so that the groove 2-1 can be formed on the entire inner surface of the inner ring 2.

The inner plunger is insert-molded in the mold 30 having such a configuration.

First, the outer ring 3 made of a magnetic metal is put in the space 30-1 for inserting the outer ring 3 of the inner plunger in the mold 30, and the core 40 with the undercut molding part 40-1 is placed in the middle of the mold 30. The inner plunger 1 is manufactured by combining, forming the inner ring 2 from a non-magnetic synthetic resin by injection of synthetic resin, and demolding.

The operation of the inner plunger of the solenoid assembly for the automotive differential clutch according to the present invention will be described in detail as follows.

First, the basic operation of a clutch solenoid assembly for an automotive differential will be described.

Electricity is supplied to the coil bobbin 10 to form an electromagnetic force when the differential device is required to operate while mounted on an automotive differential device and coupled to an inner housing 20 constituting the differential device.

Then, the inner plunger 1 moves along the inner housing 20 due to the electromagnetic force generated by the magnetic field generated from the coil bobbin 10 .

Since the above operation is a normal operation of a solenoid assembly for a clutch of an automobile differential device, a detailed description thereof will be omitted, and only the operation of the inner plunger will be described.

First, when the inner plunger 1 moves along the inner housing 20 due to the electromagnetic force generated by the magnetic field generated from the coil bobbin 10, the inner ring 2 that constitutes the inner plunger 1 is made of synthetic resin. Being less susceptible to forces improves responsiveness and helps the inner plunger 1 move along the inner housing 20 .

In particular, by constructing the inner ring 2 from a non-magnetic synthetic resin, the undercut groove 2-1 is more easily formed on the entire inner surface of the inner ring 2, so that the inner Being able to reduce friction with the housing 20 helps when the inner plunger is released from frictional resistance and acts to reciprocate along the inner housing 20 .

In addition, by forming the inner ring 2 of the inner plunger from a non-magnetic synthetic resin, it is excellent in moldability and the shape of the inner plunger can be diversified. and productivity can be improved.

A magnetic metal is inserted as the outer ring 3 into the outer circumference of the inner ring 2 of the inner plunger.

Since the outer ring 3 is composed of a magnetic metal inserted into the outer periphery of the inner ring 2 of the inner plunger, the electromagnetic force generated from the coil bobbin 10 is not lost, and the inner plunger operates smoothly. can do.

1 inner plunger 2 inner ring 2-1 undercut groove 3 outer ring 10 coil bobbin

Claims (2)

A clutch solenoid assembly comprising an outer ring (3) of an inner plunger to which a coil bobbin (10) is coupled, and an inner ring (2) integrally formed with the outer ring and coupled to an inner housing (20). In the inner plunger (1) of
The inner ring (2) of the inner plunger (1) is molded from an insulating synthetic resin having excellent moldability so that not only the shape of the inner plunger can be diversified but also the weight can be reduced. In (2), an undercut groove (2-1) is formed on the entire inner surface of the inner ring (2) so as to reduce friction with the inner housing (20) when reciprocating along the inner housing (20). formed,
A magnetic metal is inserted as an outer ring (3) into the outer peripheral edge of the synthetic resin inner ring (2) that constitutes the inner plunger. plunger. A mold (30) composed of a space (30-1) for inserting an outer ring (3) of an inner plunger and a space (30-2) for forming an inner ring (2) and an inner housing A core (40) with an undercut molding (40-1) is prepared so that an undercut groove (2-1) can be formed on the entire inner surface of the inner ring (2) so as to reduce friction with (20). a step;
An outer ring (3) made of a magnetic metal is placed in a space (30-1) for inserting the outer ring (3) of the inner plunger in the mold (30), and an undercut is formed in the center of the mold (30). combining the core (40) with the part (40-1), forming the inner ring (2) from non-magnetic synthetic resin by synthetic resin injection, and demolding. A method for manufacturing an inner plunger of a solenoid assembly for a device clutch.

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