KR101693250B1 - Wrist Joint Assembly of Robot Arm - Google Patents
Wrist Joint Assembly of Robot Arm Download PDFInfo
- Publication number
- KR101693250B1 KR101693250B1 KR1020150036884A KR20150036884A KR101693250B1 KR 101693250 B1 KR101693250 B1 KR 101693250B1 KR 1020150036884 A KR1020150036884 A KR 1020150036884A KR 20150036884 A KR20150036884 A KR 20150036884A KR 101693250 B1 KR101693250 B1 KR 101693250B1
- Authority
- KR
- South Korea
- Prior art keywords
- bevel gear
- robot arm
- wire portion
- rotation axis
- joint unit
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
- B25J17/00—Joints
- B25J17/02—Wrist joints
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
- B25J9/00—Programme-controlled manipulators
- B25J9/06—Programme-controlled manipulators characterised by multi-articulated arms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
- B25J9/00—Programme-controlled manipulators
- B25J9/10—Programme-controlled manipulators characterised by positioning means for manipulator elements
- B25J9/106—Programme-controlled manipulators characterised by positioning means for manipulator elements with articulated links
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- Engineering & Computer Science (AREA)
- Robotics (AREA)
- Mechanical Engineering (AREA)
- Manipulator (AREA)
Abstract
A wrist joint assembly of a robot arm according to the present invention comprises a first bevel gear, a second bevel gear spaced from the first bevel gear and having a rotation axis horizontal to the rotation axis of the first bevel gear, A pair of third bevel gears each having a rotation axis perpendicular to the rotation axis and meshed with one side and the other side of the first bevel gear and having a rotation axis perpendicular to the rotation axis of the second bevel gear, A second bevel gear and a fourth bevel gear which are wound on one side and the other side of the first bevel gear and the second bevel gear, And a fourth wire portion wound on the first bevel gear and having one side extending toward the rear side of the first bevel gear.
Description
The present invention relates to a wrist joint assembly of a robot arm, and more particularly, to a wrist joint assembly of a robot arm having a simple and lightweight structure while significantly increasing strength and rigidity.
Since Unimate was first used in automotive assembly in 1962, robotic engineering has become a vital technology in production, service, medical, exploration, military, and aerospace fields thanks to rapid technology development and the spread of its application offerings. I got it.
Conventional robots were intended to perform simple repetitive tasks at high speed and precise precision. However, in recent years, there have been many researches on robots that can be remotely connected to share a space with people, surgical robots that facilitate various operations such as laparoscopic surgery, And various types of robots, such as industrial robots that enable contact, are being developed.
Especially, recently developed Baxtor robot has ability to detect and adapt human force so that it can move robot directly and direct work, and it is attracted attention as next generation robot that can cooperate with robot in the same work space have.
However, Baxtor robots sacrifice robustness, rigidity, precision and operation speed in order to secure such safety, and their performance is lower than that of conventional industrial robots.
Therefore, there is a demand for a robot technology that can sense an external force, is safe in contact and collision, and satisfies high strength, rigidity, precision, and operation speed.
To accomplish this, the technology to realize the robot 's joint structure similar to that of the human arm with high degree of freedom is emerging as a core research task, and research results reflecting the achievement are also being announced.
However, the robot joint structure studied so far has a problem that its structure is very complicated in order to have sufficient strength and rigidity while having many degrees of freedom, and there is a problem that performance is degraded when the structure is simplified.
Therefore, a method for solving such problems is required.
Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a wrist joint assembly of a robot arm having a high strength and rigidity while having multiple degrees of freedom, .
The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.
In order to achieve the above object, a wrist joint assembly of a robot arm of the present invention includes a first bevel gear, a second bevel gear spaced from the first bevel gear, a second bevel gear having a rotation axis horizontal to the rotation axis of the first bevel gear, A pair of third bevel gears having a rotation axis perpendicular to the rotation axis of the first bevel gear and engaged with one side and the other side of the first bevel gear and having a rotation axis perpendicular to the rotation axis of the second bevel gear, , A pair of fourth bevel gears which are engaged with one side and the other side of the second bevel gear, respectively, and are wound on the third bevel gear and the fourth bevel gear corresponding to each other, And a fourth wire portion wound around the first bevel gear and having one side extended toward the rear side of the first bevel gear, including a pair of third wire portions crossing between the four bevel gears All.
And a driving unit for linearly moving the fourth wire unit.
The robot arm may further include a connecting bar for connecting the first bevel gear and the second bevel gear to one side of the robot arm.
The connection bar may be rotatable about at least one of the forearm and the hand.
And may further include a protection frame formed to surround the periphery of the multi-degree of freedom joint unit.
At least one of the first bevel gear and the second bevel gear may have a shape in which some arcs of the entire circumference are omitted.
And may further include a terminal guide joint unit formed to surround the periphery of the multi-degree of freedom joint unit.
And the terminal guide joint unit may include at least a first pair of pulleys and a first wire portion wound a predetermined number of times to the pair of first pulleys.
The first wire portion may further include a direction switching pulley that extends toward the rear side of the terminal guide joint unit and switches the extending direction of the first wire portion on the path of the first wire portion.
In order to solve the above-described problems, the wrist joint assembly of a robot arm of the present invention has the following effects.
First, it has high strength and rigidity, has excellent precision and can perform quick work.
Second, since the structure has a simple structure compared to the strength and rigidity, it is possible to reduce the weight and greatly reduce the manufacturing cost.
Third, various degrees of freedom of rotation can be realized, which realizes the movement of the human wrist and the like.
The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing the basic principles of strength and stiffness amplification structures for implementing the present invention;
2 is a view illustrating a terminal guide joint unit according to a first embodiment of the present invention;
FIG. 3 is a view showing a robot arm according to a first embodiment of the present invention, in which a terminal guiding joint unit is rotated; FIG.
4 is a view showing the relationship between the lengths of the first wire portion and the second wire portion according to the rotation of the rotary member in the robot arm according to the first embodiment of the present invention;
5 is a view showing a concept of a multi-degree-of-freedom joint unit in a robot arm according to a first embodiment of the present invention;
FIG. 6 is a view showing a robot arm according to a first embodiment of the present invention, in which a multi-degree-of-freedom joint unit is implemented; FIG.
7 is a view showing a hemispherical rolling motion of a robot arm according to a first embodiment of the present invention, which corresponds to driving of a multi-degree-of-freedom joint unit;
FIG. 8 is a view showing a combination of a terminal guide joint unit and a multi-degree of freedom joint unit in the robot arm according to the first embodiment of the present invention; FIG.
9 is a view showing a concrete implementation of a wrist joint assembly of a robot arm according to a second embodiment of the present invention;
10 is a side view of a wrist joint assembly of a robot arm according to a second embodiment of the present invention;
11 is a perspective view of a wrist joint assembly of a robot arm according to a second embodiment of the present invention;
12 is a view showing a first bevel gear in a wrist joint assembly of a robot arm according to a second embodiment of the present invention;
FIG. 13 is a view illustrating a wrist joint assembly of a robot arm according to a second embodiment of the present invention, in which the connecting bar is rotated axially;
FIG. 14 is a view showing the first pulley inclined at a predetermined angle according to the bending of the wrist joint assembly of the robot arm according to the second embodiment of the present invention; FIG. And
15 is a view illustrating a connection of a first wire portion in a wrist joint assembly of a robot arm according to a second embodiment of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In describing the present embodiment, the same designations and the same reference numerals are used for the same components, and further description thereof will be omitted.
BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram showing a principle of a basic strength and stiffness amplification structure for implementing the present invention. Fig.
1, a structure for amplifying strength and rigidity for realizing the present invention includes an
Particularly, the
The tensile force T of the actuator and the rigidity K of the
T out = nT
K out = n²K
As shown in the above equation, the tension is amplified in proportion to n, and the stiffness is amplified in proportion to the square of n. Since high rigidity is an essential element for precise control, it is an important feature that compensates for the decrease in rigidity when the
In the case of the present invention, the robotic joint assembly is implemented using the above-described strength and stiffness amplification structure, and the following description will be given.
In order to understand the wrist joint assembly of the present invention, first, the terminal guide joint unit will be described first, and then the multi-degree of freedom joint unit will be described.
Fig. 2 is a view showing a terminal guiding
2 and 3, the terminal
Specifically, the
In the present embodiment, the
At least one pair of the
In the present embodiment, the
The
In order to rotate the rotating
Hereinafter, the term "rear" refers to a traveling direction from the
The
That is, in this embodiment, the circulating
3, when the
Accordingly, the
Also, when the
The terminal-guided
In the present embodiment, a pair of rotations (not shown) are provided on the circumference of the
That is, the first rotation assist
At this time, the rotation assist
4 is a diagram showing the relationship between the lengths of the first wire portion and the second wire portion according to the rotation of the
The distance between the first pulley and the second pulley corresponding to each other is W and the diameter of the rotating
As can be seen from the above equation, since the first wire portion and the second wire portion move symmetrically with respect to each other, the movement of the first wire portion and the second wire portion can be controlled using only one actuator.
Therefore, in the above-described embodiment, the first wire portion and the second wire portion are formed of one circulating wire, and the circulating wire is driven by only the rotation of the circulating member by the first actuator.
Hereinafter, the multi-degree of freedom joint unit will be described.
5 is a view showing the concept of a multi-degree-of-freedom joint unit in a robot arm according to the first embodiment of the present invention.
The above-described terminal-guided joint unit has one degree of freedom, but it is not easy to realize a joint having a high degree of freedom such as a wrist or a shoulder by such a structure. Of course, a plurality of terminal guiding joint units may be connected to realize this, but this has a problem in that the structure becomes very complicated and the volume and weight increase.
Therefore, in the case of the present invention, a multi-degree-of-freedom joint unit of the concept as shown in Fig. 5 has been proposed. As shown in the figure, the multi-degree-of-freedom joint unit according to the present invention is formed such that the
Thus, the two
However, when the degree of freedom is realized by the
FIG. 6 is a view showing an embodiment of a multi-degree-of-freedom
6 and 7, the multi-degree of freedom robot
The
However, it is needless to say that, unlike the present embodiment, the rotation axis of the
The
The
The
The
R 1 = -R 2
R 3 = -R 4
That is, when the
In the present embodiment, the
8 is a view showing a combination of the terminal guide
8, a plurality of terminal-guided
Accordingly, rolling motion of the two hemispherical surfaces is realized by the multi-degree-of-freedom
In this embodiment, four terminal-guided
On the other hand, in the present embodiment, the above-described strength and stiffness amplification structure of FIG. 1 may be applied in place of the terminal guide-
Hereinafter, an embodiment in which the above matters are actually implemented will be described.
FIG. 9 is a view showing a concrete embodiment of a wrist joint assembly of a robot arm according to a second embodiment of the present invention. FIG. 10 is a side view of a wrist joint assembly of a robot arm according to a second embodiment of the present invention. Fig.
9 and 10, the wrist joint assembly of the robot arm according to the second embodiment of the present invention is provided between the
The terminal guide
At this time, the other terminal guided
11 is a view showing a main part of a wrist joint assembly of a robot arm according to a second embodiment of the present invention.
11 shows a multi-degree-of-freedom joint unit, which includes a
One side of the connecting
At this time, in the case of the
Also, in the present embodiment, the
13 is a view showing a state in which the connecting
13, one end and the other end of the connecting
In this embodiment, the
More specifically, the
The first frame and the second frame are disposed on opposite sides to stably support one
And a third frame supporting a space between the first frame and the second frame, between the first frame and the second frame. As such, when the third frame is further provided, it can be formed in a more rigid structure.
FIG. 14 is a view showing a state in which the
As shown in Fig. 14, when the wrist joint assembly is moved in one direction, the pair of
Also, since the
15, further includes a
The diverting
Further, in the present embodiment, an auxiliary
It will be apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit or scope of the invention as defined in the appended claims. It is obvious to them. Therefore, the above-described embodiments are to be considered as illustrative rather than restrictive, and the present invention is not limited to the above description, but may be modified within the scope of the appended claims and equivalents thereof.
100: terminal guide joint unit 110: circulation member
120: fixing member 122: first curved portion
130: rotating member 132: second curved portion
140: first pulley 150: second pulley
160a:
200: multi-degree-of-freedom joint unit 210: first bevel gear
220: second bevel gear 230: third bevel gear
240: fourth bevel gear 270: connecting bar
275: Retaining ring 280: Protective frame
Claims (9)
A second bevel gear spaced from the first bevel gear and having a rotation axis horizontal to the rotation axis of the first bevel gear;
A pair of third bevel gears each having a rotation axis perpendicular to the rotation axis of the first bevel gear and engaged with one side and the other side of the first bevel gear, respectively;
A pair of fourth bevel gears each having a rotation axis perpendicular to a rotation axis of the second bevel gear and engaged with one side and the other side of the second bevel gear and rotated;
A pair of third wire portions wound around the third bevel gear and the fourth bevel gear corresponding to each other and crossing between the third bevel gear and the fourth bevel gear;
A fourth wire portion wound around the first bevel gear and having one side extended toward the rear side of the first bevel gear; And
The first bevel gear and the second bevel gear are fixed to one side of the robot arm and the other side is connected to the hand of the robot arm to fix the first bevel gear and the second bevel gear, Connection bar;
And a multi-degree-of-freedom joint unit.
And a driving unit for linearly moving the fourth wire unit.
And a protective frame formed to surround the periphery of the multi-degree of freedom joint unit.
At least one of the first bevel gear and the second bevel gear,
A wrist joint assembly of a robot arm having a shape in which some of the circumferences are omitted.
And a terminal guiding joint unit formed to surround the periphery of the multi-degree of freedom joint unit.
The terminal guide joint unit includes:
At least a pair of first pulleys; And
A first wire portion wound on the pair of first pulleys a predetermined number of times;
The wrist joint assembly of the robot arm.
Wherein the first wire portion extends to the rear side of the terminal guiding joint unit,
Further comprising a direction changing pulley for changing the extending direction of the first wire portion on the path of the first wire portion.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020150036884A KR101693250B1 (en) | 2015-03-17 | 2015-03-17 | Wrist Joint Assembly of Robot Arm |
CN201680016604.2A CN107666990B (en) | 2015-03-17 | 2016-03-14 | Robot arm |
PCT/KR2016/002517 WO2016148463A1 (en) | 2015-03-17 | 2016-03-14 | Robot arm |
US15/558,199 US10744638B2 (en) | 2015-03-17 | 2016-03-14 | Robot arm |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020150036884A KR101693250B1 (en) | 2015-03-17 | 2015-03-17 | Wrist Joint Assembly of Robot Arm |
Publications (2)
Publication Number | Publication Date |
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KR20160111774A KR20160111774A (en) | 2016-09-27 |
KR101693250B1 true KR101693250B1 (en) | 2017-01-05 |
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KR1020150036884A KR101693250B1 (en) | 2015-03-17 | 2015-03-17 | Wrist Joint Assembly of Robot Arm |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20210059128A (en) | 2019-11-14 | 2021-05-25 | 중앙대학교 산학협력단 | Underactuation mechanism of wrist and forearm which is capable of fullyindependent motion in each degrees of freedom |
WO2024025388A1 (en) * | 2022-07-29 | 2024-02-01 | 주식회사 유일로보틱스 | Vertical multi-joint robot wrist axis fastening structure |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112571448A (en) * | 2020-11-30 | 2021-03-30 | 长沙理工大学 | Three-degree-of-freedom wrist device of robot |
CN113334423B (en) * | 2021-06-07 | 2023-01-24 | 核工业西南物理研究院 | Long-arm unfolding mechanical arm joint in large-magnetic-field high-vacuum strong-radiation environment |
KR102655240B1 (en) | 2022-05-04 | 2024-04-09 | 네이버랩스 주식회사 | Joint apparatus for robot |
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KR100637956B1 (en) * | 2005-07-14 | 2006-10-23 | 한국과학기술원 | Design of humanoid finger with an independent link |
JP2008232360A (en) * | 2007-03-22 | 2008-10-02 | Toshiba Corp | Wire drive mechanism, robot arm mechanism, and robot |
KR101045994B1 (en) * | 2011-04-13 | 2011-07-06 | 강희석 | Remote manipulation device |
-
2015
- 2015-03-17 KR KR1020150036884A patent/KR101693250B1/en active IP Right Grant
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100637956B1 (en) * | 2005-07-14 | 2006-10-23 | 한국과학기술원 | Design of humanoid finger with an independent link |
JP2008232360A (en) * | 2007-03-22 | 2008-10-02 | Toshiba Corp | Wire drive mechanism, robot arm mechanism, and robot |
KR101045994B1 (en) * | 2011-04-13 | 2011-07-06 | 강희석 | Remote manipulation device |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20210059128A (en) | 2019-11-14 | 2021-05-25 | 중앙대학교 산학협력단 | Underactuation mechanism of wrist and forearm which is capable of fullyindependent motion in each degrees of freedom |
WO2024025388A1 (en) * | 2022-07-29 | 2024-02-01 | 주식회사 유일로보틱스 | Vertical multi-joint robot wrist axis fastening structure |
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Publication number | Publication date |
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KR20160111774A (en) | 2016-09-27 |
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