KR20110005968A - Structure of concentric transmission with vertical trans-gear coupling with ring-type gear and trans-roller - Google Patents

Structure of concentric transmission with vertical trans-gear coupling with ring-type gear and trans-roller Download PDF

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Publication number
KR20110005968A
KR20110005968A KR1020090063370A KR20090063370A KR20110005968A KR 20110005968 A KR20110005968 A KR 20110005968A KR 1020090063370 A KR1020090063370 A KR 1020090063370A KR 20090063370 A KR20090063370 A KR 20090063370A KR 20110005968 A KR20110005968 A KR 20110005968A
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KR
South Korea
Prior art keywords
roller
gear
concentric
shifting
housing
Prior art date
Application number
KR1020090063370A
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Korean (ko)
Inventor
최현환
Original Assignee
최현환
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Filing date
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Application filed by 최현환 filed Critical 최현환
Priority to KR1020090063370A priority Critical patent/KR20110005968A/en
Publication of KR20110005968A publication Critical patent/KR20110005968A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M11/00—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels
    • B62M11/04—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio
    • B62M11/10—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio with bevel gear wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M13/00—Transmissions characterised by use of friction rollers engaging the periphery of the ground wheel
    • B62M13/02—Transmissions characterised by use of friction rollers engaging the periphery of the ground wheel with changeable ratio, e.g. with roller of varying diameter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M9/00—Transmissions characterised by use of an endless chain, belt, or the like
    • B62M9/04—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio
    • B62M9/06—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like
    • B62M9/10—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like involving different-sized wheels, e.g. rear sprocket chain wheels selectively engaged by the chain, belt, or the like
    • B62M9/12—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like involving different-sized wheels, e.g. rear sprocket chain wheels selectively engaged by the chain, belt, or the like the chain, belt, or the like being laterally shiftable, e.g. using a rear derailleur
    • B62M9/121—Rear derailleurs
    • B62M9/124—Mechanisms for shifting laterally
    • 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
    • F16H—GEARING
    • F16H3/00—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion
    • F16H3/02—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion
    • F16H3/20—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion exclusively or essentially using gears that can be moved out of gear
    • F16H3/22—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion exclusively or essentially using gears that can be moved out of gear with gears shiftable only axially
    • F16H3/30—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion exclusively or essentially using gears that can be moved out of gear with gears shiftable only axially with driving and driven shafts not coaxial

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • General Engineering & Computer Science (AREA)
  • Friction Gearing (AREA)

Abstract

The present invention has been proposed to achieve a gear shift without loss of power or disconnection during gear shifting in transmission devices of vehicles and bicycles, and to achieve this, separate concentric gears perpendicular to the power transmission unit and the above concentric circles. There is provided a structure of a transmission consisting of a cylindrical gear rotating in engagement with a gear and a transmission roller for gear selection.

Description

CONSTRUCTION OF CONCENTRIC TRANSMISSION WITH VERTICAL TRANS-GEAR COUPLING WITH RING-TYPE GEAR AND TRANS-ROLLER}

The present invention is proposed to prevent the loss or disconnection of power transmission occurring during gear shifting of vehicles and bicycles, and to provide smooth power transmission and smooth gear shifting. In the case of a transmission using a vertical transmission gear structure according to the present invention, a shift shock due to a power cut in power transmission is compared with a shock occurring and a loss in power transmission in the case of a continuously variable transmission. It does not occur and provides a structure of a transmission that minimizes power loss due to the gear structure.

In the related art, when the gear shift using the transmission of a vehicle or a bicycle is shifted to an adjacent gear stage of the chain, power breakage occurs, and thus chain lock or smooth gear shifting cannot be achieved. In addition, the continuously variable transmission method using a bearing has a loss in power transmission due to the rotation of a circular shaft in which the power transmission is engaged with the bearing, and the weight of the transmission is increased when a large bearing is used to achieve a large power transmission ratio. Has an increasing disadvantage.

Accordingly, the present invention has been proposed to provide a lightweight transmission that minimizes the interruption or loss of power transmission during gear shifting occurring in a transmission of a conventional vehicle or a bicycle, and is composed of a transmission gear perpendicular to the power transmission unit. The stepped transmission is composed of a transmission gear device separated from a device for transmitting actual power, and an object thereof is to provide a structure of a transmission consisting of a rotating unit in which a transmission gear for gear shifting is engaged.

The present invention according to one aspect for achieving the above object is to move the support device of the shifting roller arm by the shifting wire to the left and right of the rotating shaft to make a gear shift to the left and right movement of the shifting roller support device. A shifting roller moving from the inside to the outside, and a donut-shaped concentric circle gear which is in contact with the shifting roller and rotates at the same speed as the drive assembly, and a cylindrical gear rotating in engagement with the concentric circle gear. It is composed. By the above structure, a series of transmissions are configured, and a transmission structure having the same shape as the drive assembly is combined on the rotational assembly side in axial symmetry, thereby achieving a transmission having a large transmission ratio. In general, a method using two shifting disks as described above is known as a toroidal shifting method in a vehicle. However, in the toroidal type, there is no intermediate transmission gear part, and a power transmission method is also connected to two drive shafts rather than a gearing method. While there is a metal roller between the two disks, there is a loss of power transmission due to the continuous transmission method by these rollers, and there is a problem in practical use, while the concentric gears separated from each other perpendicular to the power transmission part and The concentric gearbox consisting of the shifting roller achieves gear shifting by a shifting roller and a donut-shaped concentric shifter in the shifting housing separated from the power transmission unit, and shifts using gears instead of continuous shifting using metal rollers or belts. Separate donut copper with different dimensions inherent in Provided is a stepped transmission that provides gear shifting according to the size (gear number) of the core gear.

According to the present invention including the above-described configuration, the following effects can be obtained.

First, according to the present invention, the concentric circle gear composed of the separate concentric gears and the shift roller perpendicular to the power transmission unit minimizes the interruption of the power transmission that may occur during gear shifting, thereby shifting the shock and chain during gear shifting. This prevents the departure.

Secondly, according to the present invention, the concentric circle gear composed of the concentric circle gears and the shift roller that are perpendicular to the power transmission unit is a loss of power transmission that may occur during gear shifting by braking a donut gear separate from the shift housing. Minimize.

Third, according to the present invention, the concentric gear shifting device composed of the concentric gears and the shifting roller that are perpendicular to the power transmission unit is a donut to which the shift gear is engaged, compared to the conventional gear shift providing a gear ratio with limited gear ratio. Large gear ratios can be obtained because they can vary depending on the number and spacing of the mold gears.

Fourthly, according to the present invention, the concentric transmission comprising a concentric circle gear and a shift roller that are perpendicular to the power transmission unit is lighter than the heavy metal bearing compared to a continuously variable transmission using a conventional metal bearing. Can be produced.

Example 1

1 is a perspective view illustrating a drive assembly, a shift housing and a concentric gear, and a rotation assembly of a concentric transmission device including a concentric circle gear and a shift roller that are perpendicular to the power transmission unit according to the present invention.

1 to 5, the concentric gear shifting device composed of a separate concentric gear and a shift roller perpendicular to the power transmission unit according to the present invention includes a drive assembly engaged with the chain and a cylindrical gear for transmitting power of the chain. A transmission housing comprising a power transmission unit and a cylindrical gear connected to the cylindrical gear to adjust the gear ratio, and a roller moving along the moving guide of the transmission housing and contacting each other in a brake manner by the roller. It consists of separate concentric gears and another variable speed housing and rotary assembly. There is a shift controller for shifting the shift roller support part connected to the drive shaft to the left and right of the drive shaft by the shifting wire. The shift roller moves along the driving shaft to the left and right along the driving guide. The gears are shifted in such a way that they move inwardly and outwardly of the drive shaft and rotate in synchronism with the drive assembly by grasping the separate concentric gears with different radii as brakes. The shifting roller moving along the moving guide of the shifting housing moves inward and outward of the drive shaft to change the power transmission ratio, and the power transmission is transmitted by one of the concentric circular gears in contact with the roller. The power transmitted to the cylindrical gear is transmitted to the concentric gears separated from each other of the same structure on the opposite side, and the power is transmitted to the rotating assembly. The number of teeth (radius) of the donut-shaped concentric gears separated from each other determines the gear ratio, the gear number decreases toward the inside, and the gear number increases as the outside disk gear increases. In addition, the method of moving the shifting roller along the moving guide in the shifting housing for gear shifting (selecting different concentric gears) is a wire holding device connected to wires as shown in FIG. It can also be achieved by moving the roller in and out of the drive shaft using a and spring. The shape of the donut-type concentric gears in the shift housing of the rotating assembly and the driving assembly can be either a flat disk type or a conical or conical shape. And size, shape. In addition, the shape of the concentric circle gear in the shift housing of the rotary assembly and the drive assembly is such that the rollers move smoothly when the shift roller shifts and do not exist over the adjacent donut disk gears. Should be in a form that minimizes

Hereinafter, the most preferred embodiments will be described in detail based on the structure and basic configuration of the concentric gear including a concentric gear and a shift roller that are perpendicular to the power transmission unit according to the present invention. In addition, the above-described operation methods according to the configuration applied to the basic configuration of the concentric circle gear and the shifting roller which are separated from each other perpendicular to the power transmission unit according to the present invention are applicable to all the embodiments described below. In addition, in the drawings, the size of the drive assembly and the shift housing, the size of the shift controller and the rotation assembly, and the shape and size of the concentric circle gear of the donut-shaped tank of the rotation assembly and the drive assembly are exaggerated for convenience and clarity. In the structure of the concentric circle gear composed of concentric circle gears and shift rollers, which are perpendicular to the power transmission unit, the shifting roller moves smoothly according to the left and right shift of the shifting control mechanism. It shall be of a form, size and material that minimizes

1 is a cross-sectional view for explaining the basic structure of the concentric transmission device consisting of a donut-shaped concentric circle gear and a shifting roller perpendicular to the power transmission unit according to Embodiment 1 of the present invention.

Figure 2 is a cross-sectional view for explaining the basic structure of the concentric transmission device consisting of a concentric bevel gear and a shifting roller separated from each other perpendicular to the power transmission unit according to another embodiment of the present invention.

Figure 3 is a cross-sectional view showing the coupling form of the bevel gear of the concentric transmission device composed of a concentric circle bevel gear and a shift roller separated from each other perpendicular to the power transmission unit shown in FIG.

4 is a cross-sectional view showing a concentric circular gear including a concave-convex pattern for enhancing contact with a shifting roller in a donut-shaped concentric circular gear in the shifting housing of FIG. 1;

FIG. 5 is a cross-sectional view illustrating a chain coupled to a drive assembly of a concentric transmission device including a donut-shaped concentric circle gear and a shift roller that are perpendicular to each other perpendicular to the power transmission unit shown in FIG. 1.

Figure 6 is a cross-sectional view showing the structure of the one-to-one gear ratio of the concentric transmission device consisting of a donut-shaped concentric gear and a shifting roller perpendicular to each other perpendicular to the three-speed power transmission unit shown in FIG.

FIG. 7 is a cross-sectional view showing the structure of a 1 to 3 gear ratio of a concentric transmission device consisting of a donut-shaped concentric gear and a shifting roller vertically separated from each other by a three-speed power transmission unit shown in FIG.

Figure 8 is a cross-sectional view showing the structure of the three-to-one gear ratio of the concentric transmission device consisting of a donut-shaped concentric gear and a shifting roller vertically separated from each other perpendicular to the three-speed power transmission unit shown in FIG.

FIG. 9 is a view illustrating a combination of a donut-shaped concentric gear and a cylindrical gear in a shift housing of a concentric circle gear composed of a donut-shaped and a shifting roller separated from each other perpendicular to the power transmission unit shown in FIG. 1. Conceptual diagram.

10 is a donut-shaped concentric gear and a cylindrical gear, a roller arm and a roller arm in a shift housing of a concentric circle gear composed of a donut-shaped concentric circle and a shifting roller separated from each other perpendicular to the power transmission unit shown in FIG. A perspective view showing the coupling structure of the support.

FIG. 11 is a perspective view illustrating a state in which a shift housing, a concentric gear, a roller, and a roller arm are coupled to a concentric circle gear composed of a donut-shaped concentric circle gear and a shift roller vertically separated from each other in the power transmission unit shown in FIG. .

FIG. 12 is a perspective view showing a coupling structure of a donut-shaped bevel gear of a concentric circle transmission device composed of a concentric circle bevel gear and a shifting roller vertically separated from each other by a power transmission unit consisting of two stages shown in FIG.

FIG. 13 is a conceptual view illustrating a speed change roller driving device including a wire, a wire support device, and a spring coupled with a roller that is not a roller arm and a roller arm support part, in any of FIGS. 1 to 2.

FIG. 14 is a conceptual view illustrating a structure of a roller driving device for shifting roller movement using a shifting roller driving device including a wire and a wire supporting device and a spring shown in FIG.

FIG. 15 is a conceptual view illustrating a structure of a roller drive device for shifting roller movement using a shift roller drive device including a wire and a wire support device and a spring shown in FIG.

FIG. 16 is a perspective view illustrating a structure of a roller driving device for shifting roller movement using a shifting roller driving device composed of a wire and a wire supporting device and a spring shown in FIG.

17 is a perspective view showing the structure of a roller driving device for shifting roller movement using a shifting roller driving device composed of a wire and a wire supporting device and a spring shown in FIG.

18 is a view illustrating a coupling form of a shift housing and a concentric circle gear including a holder surrounding the concentric circle gear in a concentric circle gear composed of a donut-shaped concentric circle gear and a shift roller perpendicular to each other perpendicular to the power transmission unit shown in FIG. Illustrated perspective view.

FIG. 19 is a perspective view illustrating a case in which a holder surrounding the shift housing and the concentric circle gear is separately present in a concentric circle gear configured of a donut-shaped concentric circle gear and a shift roller perpendicular to each other perpendicular to the power transmission unit shown in FIG. 1; .

20 is a donut-shaped concentric gear and a shift gear that are vertically separated from each other by a power transmission unit for transmitting power by connecting a drive assembly and a rotation assembly coupled to both ends of a driven shaft according to another embodiment of the present invention. Top view showing the basic structure of a concentric transmission consisting of rollers.

FIG. 21 is a donut-shaped concentric gear and a shift gear that are vertically separated from each other by a power transmission unit for transmitting power by connecting a drive assembly and a rotation assembly coupled to both ends of a driven shaft according to another embodiment of the present invention. Perspective view showing the basic structure of a concentric transmission comprising a roller.

<Explanation of symbols for the main parts of the drawings>

100: chain connection device of the drive assembly

101: roller arm support unit fixing device of the drive assembly

102: roller arm support of the drive assembly

103: roller arm of the drive assembly

104: shifting roller

105: moving guide for shifting rollers in the drive assembly shifting housing

106, 106-1: outermost concentric bevel gear

106-2: Outer Cabinet Concentric Bevel Gears

107: spring for coupling concentric gears in the shifting housing

108: cylindrical gear

108-1: Cylindrical gear on the drive assembly side connected to the driven shaft

108-2: Rotating assembly-side cylindrical gear connected to the driven shaft

109: outermost concentric gear

109-1: Concave-convex pattern on the opposite side of the outermost concentric gear to increase the coupling force with the shifting roller

110: shifting housing of the rotating assembly

111: Moving guide for shifting roller movement in the rotating assembly shifting housing

112: roller arm of the rotating assembly

113: roller arm support of the rotating assembly

114: roller arm support part fixing device of the rotating assembly

115: wheels

116: rotation assembly and drive assembly drive shaft

116-1: Drive shaft of drive assembly

116-2: Follower Shaft

116-3: Drive shaft of rotary assembly

117: chain coupled to the drive assembly

118: variable speed housing of the drive assembly

118-1: Concentric Gear Holders Separated from Each Other

119: innermost cabinet concentric gear

119-1: Concave-convex pattern on the opposite side of the outermost concentric gear to increase the coupling force with the shifting roller

122: shift control device connected to the shifting wire for shifting rollers embedded in the drive assembly

123: Uneven pattern carved on the opposite side of the donut-shaped concentric gears to increase the coupling force with the shifting roller

124: Bevel gear combined with concentric bevel gears separated from each other in shift gearing

125: variable speed roller drive wire

126: shifting roller driving spring

127: wire support part for the variable speed roller drive

128: variable speed roller drive wire fixing device

Claims (8)

A drive assembly having a chain connected to one side of the drive shaft; A shifting housing including a moving guide coupled to the drive assembly; A shifting roller moving inward and outward of the drive shaft along the moving guide; A roller arm connected to the roller; A roller support portion connected to the roller arm; Concentric concentric gears of a separate donut type, which are installed in the housing which is in contact with the transmission roller and transmits power and have different tooth numbers; A cylindrical gear constructed on a driven shaft which meshes with the concentric circular gear; Concentric donut-shaped gears, which are separated from each other, which are installed in another transmission housing which rotates in engagement with the cylindrical gear and have different tooth numbers; A shifting roller moving along a moving guide in the housing; A roller arm connected to the transmission roller; A roller arm support for supporting the roller arm; A rotary assembly including the roller arm support and the shift housing; And A concentric transmission comprising a donut-shaped concentric circle gear and a shifting roller vertically separated from each other by a power transmission unit including a shift control device for moving a roller arm support part of a drive assembly and a rotating assembly from side to side along a drive shaft. A drive assembly having a chain connected to one side of the drive shaft; A shifting housing including a moving guide coupled to the drive assembly; A shifting roller moving inward and outward of the drive shaft along the moving guide; A roller arm connected to the roller; A roller support portion connected to the roller arm; Bevel gears that are separated from each other in a donut-shaped gear which is installed in the housing for transmitting power by engaging the shifting roller and having different teeth; A bevel gear built on a driven shaft that meshes with the donut disc gear; Bevel gears, which are separated from each other in a donut-shaped gear, which are installed in another transmission housing which rotates in engagement with the cylindrical gear and have different teeth; A shifting roller moving along a moving guide in the housing; A roller arm connected to the transmission roller; A roller arm support for supporting the roller arm; A rotary assembly including the roller arm support and the shift housing; And A concentric transmission comprising a donut-shaped concentric bevel gear and a shifting roller vertically separated from each other by a power transmission unit including a shift control device for moving a roller arm support part of a drive assembly and a rotating assembly from side to side along a drive shaft. The method according to any one of claims 1 to 2, Concentric circle gearbox that replaces donut-shaped concentric gears with different tooth dimensions in the shift housing of a rotating assembly with one concentric circle gear. 4. The method according to any one of claims 1 to 3, A concentric transmission including a transmission roller drive device comprising a wire, a wire support, and a spring for moving the transmission roller to the outer and inner angles of the drive shaft along a moving guide in the shift housing of the rotating assembly and the driving assembly. The method according to any one of claims 1 to 4, A donut-shaped concentric gear having different tooth dimensions in the shift housing of the drive assembly and the rotary assembly includes a non-slip unevenness (109-1) with the shifting roller. A drive assembly having a chain connected to one side of the drive shaft; A shifting housing including a moving guide coupled to the drive assembly; A shifting roller moving inward and outward of the drive shaft along the moving guide; A roller arm connected to the roller; A roller support portion connected to the roller arm; Concentric concentric gears of a separate donut type, which are installed in the housing which is in contact with the transmission roller and transmits power and have different tooth numbers; A cylindrical gear constructed on a driven shaft which meshes with the concentric circular gear; Another cylindrical gear arranged at the other end of the driven shaft for accumulating the cylindrical gear; A donut-shaped concentric circular gear which is installed in the rotation assembly side shifting housing engaged with the cylindrical gear and has different tooth numbers; A shifting roller moving along a moving guide in the housing; A roller arm connected to the transmission roller; A roller arm support for supporting the roller arm; A rotary assembly including the roller arm support and the shift housing; And A concentric transmission comprising a donut-shaped concentric circle gear and a shifting roller vertically separated from each other by a power transmission unit including a shift control device for moving a roller arm support part of a drive assembly and a rotating assembly from side to side along a drive shaft. A drive assembly having a chain connected to one side of the drive shaft; A shifting housing including a moving guide coupled to the drive assembly; A shifting roller moving inward and outward of the drive shaft along the moving guide; A roller arm connected to the roller; A roller support portion connected to the roller arm; Bevel gears that are separated from each other in a donut-shaped gear which is installed in the housing for transmitting power by engaging the shifting roller and having different teeth; A bevel gear built on a driven shaft that meshes with the donut-shaped concentric gear; Another bevel gear built on the other end of the driven shaft for building the cylindrical gear; Bevel gears that are separated from each other in a donut-shaped gear that is installed in the transmission housing rotated in engagement with the cylindrical gear having different tooth numbers; A shifting roller moving along a moving guide in the housing; A roller arm connected to the transmission roller; A roller arm support for supporting the roller arm; A rotary assembly including the roller arm support and the shift housing; And A concentric transmission comprising a donut-shaped concentric bevel gear and a shifting roller vertically separated from each other by a power transmission unit including a shift control device for moving a roller arm support part of a drive assembly and a rotating assembly from side to side along a drive shaft. The method according to any one of claims 6 to 7, A concentric transmission including a transmission roller drive device comprising a wire, a wire support, and a spring for moving the transmission roller to the outer and inner angles of the drive shaft along a moving guide in the shift housing of the rotating assembly and the driving assembly.
KR1020090063370A 2009-07-13 2009-07-13 Structure of concentric transmission with vertical trans-gear coupling with ring-type gear and trans-roller KR20110005968A (en)

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Application Number Priority Date Filing Date Title
KR1020090063370A KR20110005968A (en) 2009-07-13 2009-07-13 Structure of concentric transmission with vertical trans-gear coupling with ring-type gear and trans-roller

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Application Number Priority Date Filing Date Title
KR1020090063370A KR20110005968A (en) 2009-07-13 2009-07-13 Structure of concentric transmission with vertical trans-gear coupling with ring-type gear and trans-roller

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KR20110005968A true KR20110005968A (en) 2011-01-20

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200145355A (en) 2019-06-21 2020-12-30 신희찬 Automatic power transmission apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200145355A (en) 2019-06-21 2020-12-30 신희찬 Automatic power transmission apparatus

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