KR20170102692A - Constant velocity joint - Google Patents

Constant velocity joint Download PDF

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Publication number
KR20170102692A
KR20170102692A KR1020160025136A KR20160025136A KR20170102692A KR 20170102692 A KR20170102692 A KR 20170102692A KR 1020160025136 A KR1020160025136 A KR 1020160025136A KR 20160025136 A KR20160025136 A KR 20160025136A KR 20170102692 A KR20170102692 A KR 20170102692A
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KR
South Korea
Prior art keywords
hole
hub
outer race
spline
fixing
Prior art date
Application number
KR1020160025136A
Other languages
Korean (ko)
Inventor
정창희
Original Assignee
현대위아 주식회사
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Priority to KR1020160025136A priority Critical patent/KR20170102692A/en
Publication of KR20170102692A publication Critical patent/KR20170102692A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
    • F16D3/20—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
    • F16D3/48—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part having pins arranged parallel to the axis and entering holes in the other coupling part
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2250/00—Manufacturing; Assembly
    • F16D2250/0061—Joining

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

An invention relating to a constant velocity joint is disclosed. The constant velocity joint according to the present invention comprises: an outer race having a first spline portion formed on a first surface thereof and a first through hole formed in a central portion thereof; A hub having a second spline portion formed on a surface facing the first spline portion and coupled to the first spline portion and having a second through hole corresponding to the first through hole in a central portion thereof; And a fastening part inserted into the first through hole and the second through hole and press-fitted into the first through hole and the second through hole.

Description

CONSTANT VELOCITY JOINT

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a constant velocity joint, and more particularly, to a constant velocity joint capable of preventing a joint between a hub and an outer race from being released.

In general, a constant velocity joint is installed on a driving axle connected to a longitudinal decelerating device in a front wheel drive vehicle or a front wheel drive vehicle, and is used to transmit power to a wheel of a vehicle.

In the prior art, the outer race and the hub of the constant velocity joint have a structure in which splines are formed on the surfaces facing each other, and the splines of the outer race and the hub are connected to each other and fixed by bolts.

In this conventional technique, the power transmitted from the constant velocity joint is transmitted to the hub, and the bolts connecting the outer race and the hub are loosened due to the penetration of the grease inside the outer race of the vibration or constant velocity joint into the bolt . Therefore, there is a need for improvement.

BACKGROUND ART [0002] The background art of the present invention is disclosed in Korean Patent Laid-Open Publication No. 2004-0088258 (published on October 16, 2004, entitled Joint Constant Velocity Joint).

An object of the present invention is to provide a constant velocity joint in which the outer race and the hub can be prevented from being loosened by press fitting the outer race and the hub by the fastening portion.

A constant velocity joint according to an embodiment of the present invention includes: an outer race having a first spline portion formed on one surface thereof and a first through hole formed in a center portion thereof; A hub having a second spline portion formed on a surface facing the first spline portion and coupled to the first spline portion and having a second through hole corresponding to the first through hole in a central portion thereof; And a fastening portion inserted into the first through hole and the second through hole and press-fitted into the first through hole and the second through hole.

In one embodiment of the present invention, the fastening portion is formed at one end of the body portion of the fastening portion, is exposed to the outside of the hub, and has a thread portion and a thread portion alternately formed; And a serration part formed at the other end of the body part of the fastening part in a plurality of serrations and press-fitting the first through hole and the second through hole.

In an embodiment of the present invention, a thread corresponding to the thread of the threaded portion is formed at the end of the threaded portion, and the fixed portion for fixing the outer race and the hub is fastened.

In one embodiment of the present invention, the fixing portion is formed with a caulking portion that is inserted into the valley of the threaded portion and restricts the movement of the threaded portion.

In one embodiment of the present invention, the threaded portion is limited in rotation by a pin passing through a fixing hole formed in a side surface of the fixing portion.

According to another aspect of the present invention, there is provided a constant velocity joint comprising: an outer race having a first spline section formed on a first surface thereof and a protrusion protruding from a center thereof; And a hub having a second spline portion coupled to the first spline portion on a surface facing the first spline portion and having a through hole formed in a central portion thereof, the protrusion portion being press-fitted to the through hole.

In another embodiment of the present invention, the protrusions are formed at one end of the protrusion body, are exposed to the outside of the hub, and have threads and bones formed alternately; And a serration part formed at the other end of the body part of the protrusion part in a plurality of serrations and press-fitted to the through hole.

In another embodiment of the present invention, a thread corresponding to the thread of the threaded portion is formed at an end of the threaded portion, and a fastening portion for fastening the outer race to the hub is fastened.

In another embodiment of the present invention, the fixing portion is formed with a caulking portion that is inserted into the valley of the threaded portion and restricts the movement of the threaded portion.

In another embodiment of the present invention, the threaded portion is restricted in rotation by a pin passing through a fixing hole formed in a side surface of the fixing portion.

The constant velocity joint according to the present invention can prevent the union of the outer race and the hub from being released and the power transmitted from the engine is accurately transmitted to the hub so that the wheel connected to the hub can be smoothly driven.

Further, according to the present invention, even when the grease infiltrates into the nut thread portion due to the temperature rise in the outer race, since the outer race and the hub can be firmly engaged with each other, noise or joint defects Can be prevented.

Further, according to the present invention, the bolt or projection formed on the outer race serves as a guide for fastening the hub to the hub, thereby shortening the assembly time.

According to the present invention, since the outer race and the hub are spline-coupled on the opposite faces, and the gap between the outer race and the hub can be minimized by the serrations of the bolts or projections formed on the outer race, Power loss and noise can be reduced.

1 is an assembled perspective view schematically showing a constant velocity joint according to an embodiment of the present invention.
2 is an assembled perspective view schematically illustrating fastening of an outer race and a fastening part according to an embodiment of the present invention.
3 is an assembled perspective view schematically illustrating fastening of a constant velocity joint and a hub according to an embodiment of the present invention.
4 is a partial enlarged view schematically showing the coupling between the fastening portion and the fixing portion according to the embodiment of the present invention.
5 is a cross-sectional view schematically showing a constant velocity joint according to an embodiment of the present invention.
6 is an assembled perspective view schematically showing a constant velocity joint according to another embodiment of the present invention.
FIG. 7 is an assembled perspective view schematically showing fastening of a constant velocity joint and a hub according to another embodiment of the present invention. FIG.
8 is a partially enlarged view schematically showing the coupling between the fastening portion and the fixing portion according to another embodiment of the present invention.
9 is a cross-sectional view schematically showing a constant velocity joint according to another embodiment of the present invention.

Hereinafter, an embodiment of a constant velocity joint according to the present invention will be described with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

FIG. 1 is a perspective view of a constant velocity joint according to an embodiment of the present invention, FIG. 2 is an assembled perspective view schematically showing the fastening of an outer race and a fastening part according to an embodiment of the present invention, 4 is a partial enlarged view schematically showing a coupling between a coupling portion and a fixing portion according to an embodiment of the present invention. FIG. 5 is a partial enlarged view of the coupling portion of the constant velocity joint according to the embodiment of the present invention. Is a cross-sectional view schematically showing a constant velocity joint according to an embodiment of the present invention.

1 to 5, a constant velocity joint according to an embodiment of the present invention includes an outer race 10, a fastening portion 20, and a hub 30.

In the outer race 10, a first spline portion 11 is formed on one surface (left side in FIG. 1), and a first through hole 13 is formed in the center portion. The outer race 10 is connected to the hub 30 by the first spline portion 11 and is coupled to the inner race 60 by the band portion 70. On the outer circumferential surface of the outer race (10), a groove-like receiving portion (19) for receiving the band portion (70) is formed. Grease, which is a lubricant, is accommodated in a space between the outer race 10 and the inner race 60.

The outer race 10 is rotated by receiving the rotational power of the engine. The rotational power of the engine is transmitted to the hub 30 via the outer race 10, and a driving force is generated in the wheel (not shown) through the hub 30.

The hub 30 has a second spline portion 31 formed on a surface thereof facing the first spline portion 11 of the outer race 10 and a second through hole 31 corresponding to the first through hole 13 in the center portion. (33) is formed. The first spline portion 11 and the second spline portion 31 are engaged with each other to connect the outer race 10 and the hub 30 together. Here, the first spline portion 11 and the second spline portion 31 are respectively splined, and the projecting portion and the groove portion are alternately formed, so that the projecting portion of the first spline portion 11 is engaged with the second spline portion 11, And the projecting portion of the second spline portion 31 is inserted into the groove portion of the first spline portion 11.

The fastening portion 20 is inserted from the first through hole 13 in the direction toward the second through hole 33 and is press-fitted to the first through hole 13 and the second through hole 33. That is, the fastening portion 20 is first inserted into the first through hole 13 of the outer race 10 and then inserted into the second through hole 33 of the hub 30. The fastening part 20 is formed by sequentially inserting the first through hole 13 of the outer race 10 and the second through hole 33 of the hub 30 and connecting the first through hole 13 and the second through hole 33 33 so as to connect and fix the outer race 10 and the hub 30 connected by the first spline portion 11 and the second spline portion 31 to each other.

The fastening portion 20 may be formed in a bolt shape. The fastening portion 20 includes a threaded portion 21 and a serration portion 23. The threaded portion 21 is formed at one end portion (reference left end in FIG. 1) of the body portion of the coupling portion 20 and the serration portion 23 is formed at the other end of the body portion of the coupling portion 20 . The threaded portion 21 is formed in the body of the fastening portion 20 in a spiral shape with alternating threads and valleys.

The serration part 23 is serration-processed in the body of the fastening part 20 in a serration shape along the longitudinal direction of the fastening part 20, 13). The serration part 23 is press-fitted into the first through hole 13 so that the fastening part 20 and the outer race 10 are integrated.

Here, the serration portion 23 is formed on the body portion of the fastening portion 20 so as to be exposed to the outside of the first through hole 13. And a second through hole 33 corresponding to the first through hole 13 is formed in the center of the hub 30. The serration portion 23 exposed to the outside of the first through hole 13 is press-fitted to the second through hole 33 of the hub 30. [ Therefore, the hub 30 and the outer race 10 are integrally formed by the serration portion 23 of the fastening portion 20.

The pressing force of the outer race 10 and the hub 30 can be improved by the serration portion 23 of the fastening portion 20 and the gap between the outer race 10 and the hub 30 can be minimized, The power loss and noise between the lace 10 and the hub 30 can be reduced.

Also, the fastening portion 20 guides the outer race 10 to be coupled to the hub 30, thereby shortening the assembling time of the outer race 10 and the hub 30. [

The threaded portion 21 of the fastening portion 20 that has passed through the second through hole 33 of the hub 30 is engaged with the fixing portion 40. The fixing portion 40 is formed in a nut shape, and a thread corresponding to the thread of the threaded portion 21 of the fastening portion 20 is formed at the central portion.

The fixing portion 40 is fastened to the threaded portion 21 of the fastening portion 20 so that the outer race 10 and the hub 30 are fixed.

A plurality of caulking portions 41 spaced apart from each other are protruded from the fixing portion 40. The end of the caulking portion 41 is inserted into the valley of the threaded portion 21, and the shape of the cross section is formed into a triangle. The caulking portion 41 comprises a material which is elastically deformable in the fixing portion 40.

The caulking portion 41 is formed in such a manner that the threaded portion 21 of the coupling portion 20 is movable when the coupling portion 20 rotates in one direction (the direction in which the threaded portion 21 is engaged with the fixed portion 40) And when the threaded portion 21 of the coupling portion 20 is rotated in the other direction (the direction in which the threaded portion 21 is disengaged from the fixed portion 40), it is inserted into the valley of the threaded portion 21 It is possible to prevent the fastening portion 20 from being disengaged from the fixing portion 40 by making the threaded portion 21 in the form of being tied.

The coupling portion 20 is prevented from moving by the caulking portion 41 so that the separation of the hub 30 and the outer race 10 due to the loosening of the coupling portion 20 can be prevented.

A fixing hole 43 is formed on the side surface of the fixing portion 40. And the pin 50 is inserted through the fixing hole 43. The threaded portion 21 is fixed by a pin 50 passing through the fixing hole 43 formed on the side surface of the fixing portion 40. [ The rotation of the threaded portion 21 is restricted by the pin 50, so that the rotation of the fastening portion 20 can be prevented. Therefore, separation of the hub 30 and the outer race 10 due to the release of the fastening portion 20 can be prevented.

FIG. 6 is an assembled perspective view schematically showing a constant velocity joint according to another embodiment of the present invention, FIG. 7 is an assembled perspective view schematically showing fastening of a constant velocity joint and a hub according to another embodiment of the present invention, FIG. 9 is a cross-sectional view schematically showing a constant velocity joint according to another embodiment of the present invention. FIG. 9 is a partial enlarged view schematically showing a coupling between a coupling part and a fixing part according to another embodiment of the present invention.

6 to 9, the constant velocity joint according to another embodiment of the present invention includes an outer race 10a, a fastening portion 20a, and a hub 30a.

The outer race 10a is formed with a first spline portion 11a on one side (reference left side in Fig. 6). The outer race 10a is connected to the hub 30a by the first spline portion 11a and is coupled to the inner race 60a by the band portion 70a. A groove-like receiving portion 19a for receiving the band portion 70a is formed on the outer peripheral surface of the outer race 10a. The space between the outer race 10a and the inner race 60a receives grease as a lubricant.

The outer race 10a is rotated by receiving the rotational power of the engine. The rotational power of the engine is transmitted to the hub 30a through the outer race 10a and the driving force is generated in the wheel (not shown) through the hub 30a.

At the center of the outer race 10a, a protrusion 15a is protruded. The protruding portion 15a is press-fitted to the through hole 33a of the hub 30a. The protrusion 15a is formed integrally with the outer race 10a, so that the assembly time of the hub 30a and the outer race 30a can be shortened.

The hub 30a is formed with a second spline portion 31a on the surface facing the first spline portion 11a of the outer race 10a and a through hole 33a formed in the center portion thereof. The first spline portion 11a and the second spline portion 31a are engaged with each other to connect the outer race 10a and the hub 30a. The first spline portion 11a and the second spline portion 31a are formed by spline processing so that the projecting portion and the groove portion are alternately formed so that the projecting portion of the first spline portion 11a is formed in the second spline portion 31a, And the protruding portion of the second spline portion 31 is inserted into the groove portion of the first spline portion 11.

The protrusion 15a includes a threaded portion 21a and a serration portion 23a. The protruding portion 15a presses the through hole 33a of the hub 30a and connects the outer race 10a and the hub 30a connected by the first spline portion 11a and the second spline portion 31a, .

The threaded portion 21a is formed at one end (reference left end in Fig. 6) of the body portion of the protrusion 15a and the serration portion 23a is formed at the other end (reference right end of Fig. 6) of the body portion of the protrusion 15a .

The threaded portion 21a forms a thread by rolling the outer peripheral surface of the protruding portion 15a. The threaded portion 21a is formed in the body of the coupling portion 20a in a spiral shape with alternating threads and valleys. The serration part 23a is serration formed on the outer circumferential surface of the projection part 15a in a saw-tooth shape along the longitudinal direction of the projection part 15a.

The serration portion 23a is press-fitted to the through hole 33a of the hub 30a. Therefore, the hub 30a and the outer race 10a are integrated by the serration portion 23a of the protrusion 15a.

The pressing force to the outer race 10a and the hub 30a is improved by the serration portion 23a of the protrusion 15a formed in the outer race 10a and the gap between the outer race 10a and the hub 30a is The power loss and noise between the outer race 10a and the hub 30a can be reduced.

The protrusion 15a guides the outer race 10a to be coupled to the hub 30a so that the assembling time of the outer race 10a and the hub 30a can be shortened.

The threaded portion 21a of the protrusion 15a passing through the through hole 33a of the hub 30a is engaged with the fixed portion 40a. The fixing portion 40a is formed in a nut shape, and a thread corresponding to the thread of the threaded portion 21a of the projection 15a is formed at the center portion.

A thread corresponding to the thread of the thread portion 21a is formed in the threaded portion 21a of the protrusion 15a and the fixing portion 40a for fixing the outer race 10a and the hub 30a is fastened.

A plurality of caulking portions 41a spaced apart from each other are protruded from the fixed portion 40a. The end of the caulking portion 41a is inserted into the valley of the threaded portion 21a, and the shape of the cross section is formed into a triangle. The caulking portion 41a is made of a material which is elastically deformable in the fixing portion 40a.

The caulking portion 41a is formed in such a manner that the threaded portion 21a of the protruding portion 15a is movable in the direction of one direction (the direction in which the threaded portion 21a is fastened to the fixed portion 40a) And when the threaded portion 21a of the protruding portion 15a is rotated in the other direction (the direction in which the threaded portion 21a is disengaged from the fixed portion 40a), the ball is inserted into the valley of the threaded portion 21a, It is possible to prevent the projecting portion 15a from being disengaged from the fixing portion 40a.

The movement of the projection 15a is prevented by the caulking portion 41a so that the separation of the hub 30a and the outer race 10a due to the loosening of the projection 15a can be prevented.

A fixing hole 43a is formed in the side surface of the fixing portion 40a. The pin 50a is inserted through the fixing hole 43a. The threaded portion 21a is fixed by a pin 50a passing through a fixing hole 43a formed in a side surface of the fixing portion 40a. Rotation of the threaded portion 21a is restricted by the pin 50a, so that rotation of the coupling portion 20a can be prevented. Therefore, separation of the hub 30a and the outer race 10a due to the loosening of the fastening portion 20a can be prevented.

The constant velocity joint according to the present invention can prevent the coupling between the outer race 10,10a and the hub 30,30a from being released so that the power transmitted from the engine is accurately transmitted to the hub 30,30a, 30a, 30a may be smoothly driven.

According to the present invention, even when the grease infiltrates into the threaded portion of the fixing portions 40, 40a due to the temperature rise in the outer race 10, 10a, the outer race 10, 10a and the hub 30, It is possible to prevent the generation of noise or seam defects due to the loosening of the outer races 10 and 10a and the hubs 30 and 30a.

According to the present invention, the fastening portion 20 or the protruding portion 15a formed on the outer race 10, 10a serves as a guide for fastening with the hubs 30, 30a, and the assembly time can be shortened.

According to the present invention, the outer race (10,10a) and the hub (30,30a) are spline-coupled on the opposite surfaces, and the fastening portion (20,30a) formed on the outer race (10,10a) The gap between the outer race 10,10a and the hub 30,30a can be minimized by the raising portions 23 and 23a so that the power loss between the outer race 10,10a and the hub 30,30a Noise can be reduced.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand.

Accordingly, the technical scope of the present invention should be defined by the following claims.

10: outer race 11: first spline part
13: first through hole 19: accommodating portion
20: fastening part 21: threaded part
23: Serration part 30: Hub
31: second spline portion 33: through-hole
40: fixing part 41: caulking part
43: Fixing ball 50: Pin
60: inner race 70: band part
10a: outer race 11a: first spline portion
15a: projecting portion 19a:
21a: Thread portion 23a: Serration portion
30a: hub 31a: second spline portion
33a: through hole 40a:
41a: caulking portion 43a:
50a: pin 60a: inner race
70a: band portion

Claims (10)

An outer race in which a first spline portion is formed on one surface and a first through hole is formed in a center portion;
A hub having a second spline portion formed on a surface facing the first spline portion and coupled to the first spline portion and having a second through hole corresponding to the first through hole in a central portion thereof; And
And a fastening portion inserted into the first through hole and the second through hole and press-fitted into the first through hole and the second through hole.
The method according to claim 1,
Wherein the fastening portion is formed at one end of the body portion of the fastening portion, is exposed to the outside of the hub, and has a thread portion and a thread portion alternately formed; And
And a serration portion formed at the other end of the body portion of the fastening portion in a plurality of serrations and press-fitted to the first through hole and the second through hole.
3. The method of claim 2,
At the end of the threaded portion,
Wherein a thread corresponding to the thread of the threaded portion is formed, and the outer race and the fixing portion for fixing the hub are fastened.
The method of claim 3,
And a caulking portion is formed in the fixing portion, the caulking portion being inserted into the valley of the threaded portion and restricting the movement of the threaded portion.
The method of claim 3,
Wherein the threaded portion is restricted in rotation by a pin passing through a fixing hole formed in a side surface of the fixing portion.
An outer race in which a first spline portion is formed on one surface and a protruding portion is protruded in a central portion; And
And a hub having a second spline portion formed on a surface thereof facing the first spline portion and coupled to the first spline portion and having a through hole formed in a central portion thereof,
And the protruding portion is press-fitted to the through hole.
The method according to claim 6,
Wherein the protrusions are formed at one end of a body of the protrusions and exposed to the outside of the hub, the threads being alternately formed with the threads; And
And a serration part formed at the other end of the body part of the protrusion part in a plurality of serrations and press-fit with the through hole.
8. The method of claim 7,
At the end of the threaded portion,
Wherein a thread corresponding to the thread of the threaded portion is formed, and the outer race and the fixing portion for fixing the hub are fastened.
9. The method of claim 8,
And a caulking portion is formed in the fixing portion, the caulking portion being inserted into the valley of the threaded portion and restricting the movement of the threaded portion.
9. The method of claim 8,
Wherein the threaded portion is restricted in rotation by a pin passing through a fixing hole formed in a side surface of the fixing portion.
KR1020160025136A 2016-03-02 2016-03-02 Constant velocity joint KR20170102692A (en)

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Application Number Priority Date Filing Date Title
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KR20170102692A true KR20170102692A (en) 2017-09-12

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