WO2024049241A1

WO2024049241A1 - Disconnector for differential

Info

Publication number: WO2024049241A1
Application number: PCT/KR2023/013009
Authority: WO
Inventors: 이창훈; 노의동; 박강우; 서정현
Original assignee: 주식회사 유니크
Priority date: 2022-09-01
Filing date: 2023-08-31
Publication date: 2024-03-07
Also published as: KR20240032259A

Abstract

The present invention relates to a disconnector provided in a differential of a four-wheel drive vehicle and controlling power transmission of a drive shaft, the disconnector comprising: a donut-shaped case through and to which the drive shaft penetrates and is coupled; a coil assembly provided inside the case; and a yoke movably mounted on one surface of the case. Here, a gap is provided between the case and the yoke in order to improve responsiveness to magnetic force.

Description

Disconnector for differential

The present invention relates to a disconnector for a differential, and more specifically, to a disconnector installed in the differential of a four-wheel drive vehicle to connect or cut off power as needed.

Generally, the driving method of a vehicle is divided into a two-wheel drive method that transmits the engine's driving force to only one of the front and rear wheels, and a four-wheel drive method that transmits the engine's driving force to both the front and rear wheels.

The above-described four-wheel drive system includes a part-time four-wheel drive system that allows the driver to select between two-wheel drive and four-wheel drive as needed, and a four-wheel drive system that operates without any special operation by the driver. It is further divided into full-time four wheel drive.

The four-wheel drive system described above evenly distributes the driving force of the engine to four wheels, thereby optimizing the grip of the wheels, enabling stable driving performance on rough roads with many irregularities or on surfaces that are prone to slippery.

However, the four-wheel drive system had the problem of reduced fuel efficiency because all four wheels were driven even during high-speed or constant-speed driving. To solve this problem, two-wheel drive and four-wheel drive were used depending on the vehicle's driving situation and/or road conditions. Technology for automatically selecting wheel drive was required.

Publication Patent Publication No. 2016-0026157 (2016.03.09.) discloses a disconnect system and its control method to solve the problems of the four-wheel drive system described above.

However, the conventional disconnect system uses an electronic PTU (Power Take-off Unit) connected to the output shaft of the transmission to cut off power transmitted to the rear wheels. The structure is complex, connection and disconnection of power is not smooth, and responsiveness is poor. and there was a problem of deterioration in durability.

The present invention is intended to solve the problems of the prior art described above, and its purpose is to provide a disconnector for a differential device that has excellent responsiveness for connecting and disconnecting power and can secure durability.

The present invention for achieving the above object is a disconnector provided in a differential device of a four-wheel drive vehicle to interrupt power transmission of a drive shaft, comprising a donut-shaped case through which the drive shaft is coupled, and a disconnector provided inside the case. It includes a coil assembly and a yoke movably installed on one surface of the case. At this time, a gap is provided between the case and the yoke to improve responsiveness to magnetic force.

In the present invention with the above-described configuration, the yoke moves in the longitudinal direction of the drive shaft by the magnetic force generated from the coil assembly when power is applied, and the power transmission of the drive shaft is interrupted.

As described above, in the present invention, a predetermined gap is provided between the yoke that moves when power is applied and the case, so a magnetic force to move the yoke at the beginning of power application, that is, a magnetic force that can overcome the movement resistance of the yoke due to the residual magnetic field. can be secured.

In addition, the gap provided between the case and the yoke can prevent deformation and damage of parts due to contact with the case when the yoke is moved, thereby improving the durability of the disconnector.

1 is a perspective view of a disconnector for a differential device according to an embodiment of the present invention.

Figure 2 is a cross-sectional view of a disconnector for a differential device according to an embodiment of the present invention.

Figure 3 is a diagram illustrating the operating state of a disconnector for a differential device according to an embodiment of the present invention.

The above-mentioned objects, features, and advantages will be described in detail later with reference to the attached drawings, so that those skilled in the art will be able to easily implement the technical idea of the present invention. In describing the present invention, if it is determined that a detailed description of known technologies related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings. In the drawings, identical reference numerals are used to indicate identical or similar components.

Although first, second, etc. are used to describe various components, these components are of course not limited by these terms. These terms are only used to distinguish one component from another component, and unless specifically stated to the contrary, the first component may also be the second component.

Throughout the specification, unless otherwise stated, each element may be singular or plural.

Hereinafter, the “top (or bottom)” of a component or the arrangement of any component on the “top (or bottom)” of a component means that any component is placed in contact with the top (or bottom) of the component. Additionally, it may mean that other components may be interposed between the component and any component disposed on (or under) the component.

Additionally, when a component is described as being “connected,” “coupled,” or “connected” to another component, the components may be directly connected or connected to each other, but the other component is “interposed” between each component. It should be understood that “or, each component may be “connected,” “combined,” or “connected” through other components.

As used herein, singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, terms such as “consists of” or “comprises” should not be construed as necessarily including all of the various components or steps described in the specification, and some of the components or steps may include It may not be included, or it should be interpreted as including additional components or steps.

Throughout the specification, when referred to as “A and/or B”, this means A, B or A and B, unless specifically stated to the contrary, and when referred to as “C to D”, this means unless specifically stated to the contrary. Unless there is one, it means that it is C or higher and D or lower.

The differential disconnector according to an embodiment of the present invention is a device provided in the differential of a four-wheel drive vehicle to regulate power transmission of the drive shaft according to the driving situation of the vehicle and/or the conditions of the driving road.

As shown in the drawing, the disconnector 10 for a differential device according to this embodiment includes a case 100 coupled to the drive shaft (S) of a differential device (not shown), and an inside of the case 100. It includes a coil assembly 200 and a yoke 300 movably installed on the front of the case 100.

The case 100 has a donut shape so that the drive shaft S can penetrate and be coupled thereto, and is formed in a hollow donut shape with the front open to accommodate the coil assembly 200.

This case 100 consists of an outer case 110 forming an outer ring, an inner case 120 forming an inner ring, and a floor 130 connecting the outer case 110 and the inner case 120.

The outer case 110 is a cylindrical shape with a relatively large diameter to surround the outer circumference of the coil assembly 200, and the inner case 120 is a cylindrical shape with a relatively small diameter to surround the inner circumference of the coil assembly 200. am. In addition, the floor 130 has a disk shape that forms the rear of the case 100, and protrudes further inward than the inner case 120 to limit the movement of the yoke 300.

As described above, the inner case 120 has a cylindrical shape extending in the direction of the drive shaft S, and includes a first small diameter portion 122 formed on the floor 130 side and a first small diameter portion 122 extending from the first small diameter portion 122. It has a multi-stage cylindrical shape consisting of the first large neck portion (124).

The first large diameter portion 124 is formed in a tapered shape whose diameter becomes smaller as it moves away from the first small diameter portion 122. That is, the inner peripheral surface of the first large diameter portion 124 is inclined at an angle of 10 to 12 degrees with respect to the drive shaft (S).

In this way, when the first large diameter portion 124 is manufactured in a tapered shape, the mobility of the yoke 300 provided on the front of the case 100 can be improved, thereby responding to the magnetic force generated by the coil assembly 200. By improving performance, the operability of the disconnector 10 for a differential device can be secured.

The coil assembly 200 is a means of generating a magnetic force to move the yoke 300 when power is applied, and consists of a bobbin 210 having a hollow spool shape and a coil 220 wound around the outer peripheral surface of the bobbin 210. .

When power is applied, the yoke 300 moves by the magnetic force generated from the coil assembly 200. That is, the magnetic force generated in the coil assembly 200 is induced by the case 100 and the plate 500, which will be described later, to form a magnetic field, thereby generating an attractive force to move the yoke 300. At this time, the strength of the attraction force generated by the magnetic force is proportional to the strength of the current applied to the coil 220 and/or the number of coils 220 wound around the bobbin 210.

As shown in FIG. 2, a housing 400 is provided around the coil assembly 200. The housing 400 is formed in a cylindrical shape surrounding the outer peripheral surface of the coil assembly 200, and is made of an insulator to electrically block the space between the case 100 and the coil assembly 200.

Additionally, a plate 500 is provided on the front of the coil assembly 200 to form a magnetic field by inducing the magnetic force generated by the coil assembly 200. The plate 500 is formed in a disk shape that covers the open front surface of the housing 400. At this time, the plate 500 is formed to only partially cover the open front surface of the housing 400 so as to effectively induce the magnetic force generated in the coil assembly 200. is formed

The yoke 300 moves by the magnetic force generated from the coil assembly 200 and serves to control power transmission of the drive shaft (S).

The yoke 300 in this embodiment includes a cylindrical yoke body 310 inserted into the case 100, and a disk-shaped yoke cover 320 formed at one end of the yoke body 310.

The yoke body 310 has a multi-stage cylindrical shape consisting of a second large diameter portion 312 formed on the yoke cover 320 side and a second small diameter portion 314 extending from the second large diameter portion 312.

The second large diameter portion 312 is formed in a tapered shape whose diameter becomes smaller toward the second small diameter portion 314. That is, the inner peripheral surface of the second large-diameter portion 312 is formed as an inclined surface inclined by 10 to 12 degrees with respect to the drive shaft (S) corresponding to the inner peripheral surface of the first large-diameter portion 124.

As described above, if the second large diameter portion 312 is manufactured in a tapered shape, the mobility of the yoke 300 provided on the front of the case 100 can be improved, and through this, the magnetic force generated by the coil assembly 200 can be reduced. By improving the responsiveness to the differential device, the operability of the disconnector 10 for the differential device can be secured.

Meanwhile, a gap C is provided between the case 100 and the yoke 300 described above. The gap C is used to secure the magnetic force necessary for movement of the yoke 300, and is preferably 0.50 mm.

[Table 1]

Table 1 above shows the operation of the yoke 300 according to the change in the gap C between the case 100 and the yoke 300 when a current of 3.0 A is applied to the disconnector 10 for the differential device of this embodiment. This is the result of an experiment measuring the movement resistance of the yoke (300) due to magnetic force (attraction force) and residual magnetic field.

As shown in Table 1, when the gap (C) between the case 100 and the yoke 300 is 0.50 mm, the difference between magnetic force (attraction force) and movement resistance is 35.0 N, and when it is 0.40 mm, it is 8.8 N, 0.30 In the case of mm, it can be seen that it is -11N.

In other words, when the gap (C) between the case 100 and the yoke 300 is 0.50 mm, the difference between the magnetic force (attraction force) and the movement resistance is the maximum of 35.0 N, which means that sufficient magnetic force necessary for the movement of the yoke 300 is secured. You can check it. In particular, when the gap (C) is 0.30 mm, the difference is -11N, and it can be seen that the yoke 300 cannot be moved due to the movement resistance.

On the other hand, when the gap (C) between the case 100 and the yoke 300 is 0.60mm, the difference between magnetic force (attraction force) and movement resistance is 15.4N, when it is 0.70mm, it is 12.4N, and when it is 0.80mm, it is 11.4N. Able to know.

In other words, as the gap C between the case 100 and the yoke 300 decreases, both the magnetic force (attraction force) and the movement resistance decrease, but it can be confirmed that sufficient magnetic force required for the movement of the yoke 300 cannot be secured. .

In the end, only when the gap C between the case 100 and the yoke 300 is set to 0.50 mm, the movement resistance caused by the flow of magnetic force leading to the yoke 300 through the floor 130 of the case 100 can be overcome. Thus, sufficient magnetic force (attraction force) for the operation of the yoke 300 can be secured.

As described above, the present invention has been described with reference to the illustrative drawings, but the present invention is not limited to the embodiments and drawings disclosed herein, and various modifications may be made by those skilled in the art within the scope of the technical idea of the present invention. It is obvious that transformation can occur. In addition, although the operational effects according to the configuration of the present invention were not explicitly described and explained while explaining the embodiments of the present invention above, it is natural that the predictable effects due to the configuration should also be recognized.

Claims

A disconnector provided in the differential of a four-wheel drive vehicle to regulate power transmission of the drive shaft,

A donut-shaped case through which the drive shaft is coupled;

a coil assembly provided inside the case; and

Includes a yoke movably installed on one side of the case,

A disconnector for a differential device, wherein when power is applied, the yoke moves in the longitudinal direction of the drive shaft by magnetic force generated from the coil assembly and interrupts power transmission of the drive shaft.
In claim 1,

A disconnector for a differential device, further comprising a cylindrical housing surrounding an outer peripheral surface of the coil assembly.
In claim 2,

A disconnector for a differential device, further comprising a plate covering an open surface of the housing.
In claim 3,

The case is a disconnector for a differential device, characterized in that it consists of an outer case forming an outer ring of the case, an inner case forming an inner ring of the case, and a floor connecting the outer case and the inner case.
In claim 4,

The disconnector for a differential device, wherein the inner case has a multi-stage cylindrical shape consisting of a first small diameter portion formed on the floor side and a first large diameter portion extending from the first small diameter portion.
In claim 5,

A disconnector for a differential device, wherein the first large diameter portion has a tapered shape whose diameter becomes smaller as the distance from the first small diameter portion increases.
In claim 6,

The yoke is a disconnector for a differential device, characterized in that it consists of a cylindrical yoke body inserted into the interior of the case, and a disk-shaped yoke cover formed at one end of the yoke body.
In claim 7,

The yoke body is a disconnector for a differential device, characterized in that the yoke body has a multi-stage cylindrical shape consisting of a second large diameter portion formed on the yoke cover side and a second small diameter portion extending from the second large diameter portion.
In claim 8,

A disconnector for a differential device, wherein the second large diameter portion has a tapered shape whose diameter becomes smaller toward the second small diameter portion.
The method according to any one of claims 1 to 9,

A disconnector for a differential device, characterized in that a gap is provided between the case and the yoke.
In claim 10,

A disconnector for a differential device, characterized in that the gap is 0.50 mm.