Classifications

• • 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
  • F16H15/00—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members
  • F16H15/02—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members without members having orbital motion
  • F16H15/04—Gearings providing a continuous range of gear ratios
• • 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
  • F16H15/00—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members
  • F16H15/48—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members with members having orbital motion
  • F16H15/50—Gearings providing a continuous range of gear ratios
• • 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
  • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
  • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
  • F16H25/20—Screw mechanisms
  • F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members

Definitions

• the present invention relates, in general, to continuously variable transmissions and, more particularly, to a continuously variable transmission which can function as a clutch to control speed and has an integrated structure, so that it can be used in various fields, for example, in a machining device, a vehicle, etc.
• the gearshift control unit may include: a cylindrical body coupled to the input unit; the first and second outer raceways coupled to the cylindrical body so as to be rotatable along with the cylindrical body, the first and second outer raceways being provided on a circumferential inner surface of the input unit, each of the first and second outer raceways having an annular shape; the first and second inner raceways having outer diameters less than inner diameters of the first and second outer raceways, the first and second inner raceways being provided around an outer surface of the output unit, wherein the first and second inner raceways are threaded to each other, and each of the first and second inner raceways has an annular shape; the rotary members provided between the first and second outer raceways and the first and second inner raceways, wherein the rotary members are in contact with the first and second outer raceways and the first and second inner raceways depending on adjustment of the distance between the first and second inner raceways, thus conducting planetary motion; and a compression unit coupled to an inner surface of the cylindrical body and disposed in front of the speed change unit.
• the first and second outer raceways may be coupled to an inner circumference of the housing.
• the first and second outer raceways may be coupled to the housing using a key so as to be movable in a horizontal direction.
• the continuously variable transmission may further include a tubular shaft to which an input shaft of the input unit is fastened, wherein one of the first and second inner raceways may be threaded over a circumferential outer surface of the tubular shaft, and a remaining one of the first and second inner raceways may be integrated with the tubular shaft .
• the flange may be integrally provided on the output shaft of the output unit.
• FIG. 2 is a sectional view taken along the line A-A of FIG. 1;
• FIG. 3 is a plan view of the continuously variable transmission according to the first embodiment of the present invention.
• FIGS. 4a and 4b are enlarged views showing a method for controlling gearshift according to the first embodiment
• FIG. 5 is a view showing another example of a rotary member according to the present invention
• the gearshift control unit 200 includes a cylindrical body 210 which has a cylindrical shape and is open on opposite ends thereof. Furthermore, a stop protrusion 212 is provided on the circumferential inner surface of the cylindrical body 210. In addition, a depression 214 is formed in the circumferential inner surface of the cylindrical body 210 at a position adjacent to the stop protrusion 212. An internal thread 216 having a predetermined depth is formed in a portion of the circumferential inner surface of the cylindrical body 210 which is outside the areas of the stop protrusion 212 and the depression 214.
• the convex surfaces 224 and 224a are respectively formed in the first and second inner raceways 223 and 223a at positions adjacent to each other and corresponding to the convex surfaces 222 and 222a of the first and second outer raceways 221 and 221a. Therefore, when the first and second outer raceways 221 and 221a and the first and second inner raceways 223 and 223a are installed in the cylindrical body 210, the convex surfaces 222, 222a, 224 and 224a form a "+" shape. When one of the first and second inner raceways 223 and 223a rotates, the first and second inner raceways 223 and 223a approach or move away from each other because of the threaded coupling structure.
• the contact surfaces 226b have concave shapes corresponding to the convex surfaces 222, 222a, 224 and 224a of the first and second outer raceways 221 and 221a and the first and second inner raceways 223 and 223a.
• the second inner raceway 223a rotates, because the protrusions 223b provided on the second inner raceway 223a are alternately coupled to the protrusions 224a provided on the rotating pipe 244.
• the second inner raceway 223a moves towards the first inner raceway 223, because they are threaded to each other. Thereby, a distance between the first and second inner raceways 223 and 223a is reduced. Furthermore, as shown in FIG.
• the diameter of the roller 22 ⁇ e is greater than that of the rotary member body 22 ⁇ a such that the outer surface of the roller 22 ⁇ e protrudes outside of the rotary member body 226a.
• the continuously variable transmission 10a includes a housing 1100 which has a cylindrical structure which has an internal space 1102 therein and is open on the opposite ends thereof.
• a cover 1110 One of the open ends of the cylindrical housing 1100 is covered with a cover 1110, and a remaining one is covered with a support member 1234.
• the support member 1234 is threaded into the circumferential inner surface of the housing 1100. Therefore, the support member 1234 moves in the longitudinal direction of the housing 1100 depending on tightening or loosening of the support member 1234 into or from the housing 1100.
• the continuously variable transmission 10a further includes a gearshift control unit 1200 which is installed in the internal space 1102 of the housing 1100 and controls the speed of the transmission using external power.
• a speed change unit 1220 is installed in the cylindrical body 1210 to change the speed of the transmission.
• the speed change unit 1220 includes a first outer annular raceway 1221 which has a convex inner surface 1222 having an arc-shaped cross-section.
• the first outer raceway 1221 is installed in the depression 1214 using a retaining bar 1218 such that the first outer raceway 1221 can be rotated along with the cylindrical body 1210.
• the speed change unit 1220 further includes a second outer annular raceway 1221a which has a convex inner surface 1222a having an arc-shaped cross-section and corresponds to the first outer raceway 1221 and is threaded into the circumferential inner surface of the cylindrical body 1210.
• the speed change unit 1220 further includes first and second inner annular raceways 1223 and 1223a which respectively have outer diameters less than the inner diameters of the first and second outer raceways 1221 and 1221a.
• Convex surfaces 1224 and 1224a are respectively formed on the circumferential outer surfaces of the first and second inner raceways 1223 and 1223a.
• the first and second inner raceways 1223 and 1223a are constructed such that they can approach and move away from each other.
• the first inner raceway 1223 is coupled to an input shaft 1310 and fastened to a tubular shaft 1314 which is installed along the center axis of the housing 1100.
• the second inner raceway 1223a is coupled to the circumferential outer surface of the tubular shaft 1314 using a retaining bar 1316 so as to be movable in the longitudinal direction of the tubular shaft 1314.
• a plurality of rotary members 1226 having high hardness and stiffness is installed between the first and second outer raceways 1221 and 1221a and the first and second inner raceways 1223 and 1223a.
• each rotary member 1226 includes a rod-shaped rotary member body 1226a.
• Conical contact surfaces 1226b are formed on opposite ends of the rotary member body 1226a. The conical contact surfaces 1226b are in contact with the convex surfaces 1222, 1222a, 1224 and 1224a of the first and second outer raceways 1221 and 1221a and the first and second inner raceways 1223 and 1223a.
• the compression unit 1230 includes an elastic member 1232 which is in contact with the side of the second inner raceway 1223a and elastically compresses the second inner raceway 1223a towards the first inner raceway 1223.
• the elastic member 1232 is supported by the support member 1234.
• the continuously variable transmission further includes an input unit 1300 which is fastened to the tubular shaft 1314 provided along the central axis of the housing 1100.
• the input unit 1300 transmits external power to the gearshift control unit 1200.
• the input unit 1300 includes an input shaft part 1310, which is coupled to the tubular shaft 1314, and one end of which extends outside and is coupled to a drive unit (not shown) which is separately provided outside of the transmission.
• the torque of the transmission can be controlled by the above-mentioned operation.
• the worm gear 1246 is rotated such that the support member 1234 is moved towards the output unit 1400. Then, the second inner raceway 1223a can be moved towards the output unit 1400.
• the high speed torque and the low speed torque can be embodied.
• the support member 1234 is threaded to the housing 1100 such that it is operated in conjunction with the worm wheel 1245 through the pin 1235, a pressure at which the support member 1234 compresses the elastic member 1232 can be adjusted when controlling the torque of the transmission.
• first outer raceway 2221 is fastened to the circumferential inner surface of the housing 2100 using the retaining bar 2106.
• the second outer raceway 2221a is threaded into the circumferential inner surface of the first outer raceway 2221 so as to be threadedly movable in the longitudinal direction of the housing 2100.
• first inner raceway 2223 is threaded over the circumferential outer surface of the tubular shaft 2314 so as to be movable in the longitudinal direction of the tubular shaft 2314.
• the second inner raceway 2223a may be integrally provided on the tubular shaft 2314 at a position corresponding to the first inner raceway 2223 or, alternatively, it may be coupled to the tubular shaft 2314 using a separate coupling means.
• first and second outer raceways 2221 and 2221a and the first and second inner raceways 2223 and 2223a are installed in the housing 2100, they form a "+" shape.
• one of the first and second outer raceways 2221 and 2221a rotates, for example, in this embodiment, when the second outer raceway 2221a rotates, it moves along a thread 222b of the first outer raceway 2221.
• the first and second outer raceways 2221 and 2221a approach or move away from each other.
• a plurality of rotary members 2226 having high hardness and stiffness is installed between the first and second outer raceways 2221 and 2221a and the first and second inner raceways 2223 and 2223a.
• FIG. 9 is a sectional view illustrating a continuously variable transmission, according to a fourth embodiment of the present invention.
• the gearshift control unit 3200 includes a cylindrical body 3210 which has a cylindrical shape and is open on the opposite ends thereof.
• a thread 3216 is formed in a first end of the circumferential inner surface of the cylindrical body 3210.
• a recess 3218 is formed in a second end of the cylindrical body 3210.
• the cylindrical body 3210 is fastened to the circumferential inner surface of the housing 3100.
• a depression 3104 is longitudinally formed in the circumferential inner surface of the housing 3100.
• the cylindrical body 3210 is fastened to the depression 3140 using a retaining bar 3106.
• the speed change unit 3220 includes first and second outer annular raceways 3221 and 3221a which include convex inner surfaces 3222 and 3222a having arc-shaped cross-sections.
• the first and second outer raceways 3221 and 3221a are fastened to the cylindrical body 3210.
• the speed change unit 3220 further includes first and second inner annular raceways 3223 and 3223a which respectively have outer diameters less than the inner diameters of the first and second outer raceways 3221 and 3221a.
• Convex surfaces 3224 and 3224a are respectively formed on the circumferential outer surfaces of the first and second inner raceways 3223 and 3223a such that they correspond to each other.
• first inner raceway 3223 is threaded over a circumferential outer surface of a tubular shaft 3314 which is provided adjacent to an input unit 3300.
• the second inner raceway 3223a is firmly fastened to the circumferential outer surface of a tubular shaft 3314 using a fastening means.
• a plurality of rotary members 3226 having high hardness and stiffness is installed between the first and second outer raceways 3221 and 3221a and the first and second inner raceways 3223 and 3223a.
• an output unit 3400 is provided at a position opposite the input unit 3300 to receive power from the input unit 3300 and output torque changed in speed by the gearshift control unit 3200.
• FIG. 10 is a sectional view illustrating a continuously variable transmission, according to a fifth embodiment of the present invention.
• the continuously variable transmission 1Od according to the fifth embodiment of the present invention includes a housing 4100 which has an internal space 4102 therein and is open on the opposite ends thereof. One open end of the housing 4100 is covered with a cover 4110.
• the continuously variable transmission 1Od further includes a speed change unit 4220 which is installed in the internal space 4102 of the housing 4100 to receive power transmitted from the outside and changes in speed of torque thereof.
• the speed change unit 4220 includes first and second outer annular raceways 4221 and 4221a which include convex inner surfaces 4222 and 4222a having arc-shaped cross-sections.
• a depression 4104 is formed in the circumferential inner surface of the housing 4100 in the longitudinal direction of the housing 4100.
• the first and second outer raceways 4221 and 4221a are installed in the depression 4104 of the housing 4100 using a retaining bar 4106.
• first and second outer raceways 4221 and 4221a and the first and second inner raceways 4223 and 4223a When the first and second outer raceways 4221 and 4221a and the first and second inner raceways 4223 and 4223a are installed in the housing 4100, they form a "+" shape.
• a plurality of rotary members 4226 having high hardness and stiffness is installed between the first and second outer raceways 4221 and 4221a and the first and second inner raceways 4223 and 4223a.
• a speed control unit 4240 which operates the second outer raceway 4221a is provided between the speed change unit 4220 and the cover 4110.
• the speed control unit 4240 includes a worm wheel 4245, the outer surface of which engages with a worm gear 4246.
• a coupling part 4221b is provided on the second outer raceway 4221a.
• the worm wheel 4245a is threaded to the coupling part 4221b of the second outer raceway 4221a, so that the second outer raceway 4221a is moved towards or away from the first outer raceway 4221 by the rotation of the worm wheel 4245a.
• an input unit 4300 is provided on the center axis of the housing 4100 to transmit external power to the speed change unit 4220.
• the input unit 4300 comprises an input shaft 4310 which is protruded at a first end thereof outside of the housing 4100 and coupled at a second end thereof to the tubular shaft 4314.
• FIG. 11 is a view showing another example of the rotary member according to the fifth embodiment of the present invention.
• FIG. 12 is a view showing a further example of the rotary member according to the fifth embodiment of the present invention.
• the general construction of the continuously variable transmission 1Od of FIG. 11 remains the same as that of FIG. 10.
• concave surfaces 4222, 4222a, 4224 and 4224a are respectively formed in facing surfaces of the first and second outer raceways 4221 and 42221a and the first and second inner raceways 4223 and 4223a.
• FIG. 13 is a view showing yet another example of a rotary member according to the fifth embodiment of the present invention.
• contact members 4422a protrude from the flange 4420.
• the sidewall of each contact member 4422a is in contact with the rollers 4227e of the corresponding rotary members 4227 in the direction in which the rotary members 4227 rotate.
• FIG. 14 is a view showing a still another example of the rotary member according to the fifth embodiment of the present invention.
• concave surfaces 4222, 4222a, 4224 and 4224a are respectively formed in facing surfaces of the first and second outer raceways 4221 and 42221a and the first and second inner raceways 4223 and 4223a.
• the rotary member 4228 includes a cylindrical rotary member body 4228a which has contact surfaces 4228b on the opposite ends thereof.
• the contact surfaces 4228b are in contact with the convex surfaces 4222, 4222a, 4224 and 4224a of the first and second outer raceways 4221 and 42221a and the first and second inner raceways 4223 and 4223a.
• Each contact surface 4228b which is in contact with the corresponding convex surfaces 4222, 4222a, 4224 and 4224a has a linear cross-section.
• contact members 4422a protrude from the flange 4420.
• the sidewall of each contact member 4422a is in contact with the rollers 4228e of the corresponding rotary members 4228 in the direction in which the rotary members 4228 rotate.
• a speed change unit 5220 is installed in the cylindrical body 5210 of the housing 5100 to receive power transmitted from the outside and change in the speed of torque thereof.
• the speed change unit 5220 includes first and second outer annular raceways 5221 and 5221a which include convex inner surfaces 5222 and 5222a having arc-shaped cross-sections.
• the first and second outer raceways 5221 and 5221a are fastened to the circumferential inner surface of the cylindrical body 5210 using a retaining bar 5104.
• an elastic member 5323 which is supported by one bent part 5120a of the cylindrical body 5120 is provided between the second outer raceway 5221a and the bent part 5120a of the cylindrical body 5120 in order to elastically support the second outer raceway 5221a.
• a plurality of rotary members 5226 having high hardness and stiffness is installed between the first and second outer raceways 5221 and 5221a and the first and second inner raceways 5223 and 5223a.
• Each rotary member 5226 includes a cylindrical rotary member body 5226a.
• Contact surfaces 5226b having concave shapes are formed on the opposite ends of the rotary member body 5226a.
• a space 5226c is formed in the central portion of the rotary member body 5226a.
• a central shaft 5226d is provided in the space 5226c.
• a roller 5226e is provided around the central shaft 5226d.
• bent parts 6212a which extend predetermined lengths inwards are provided on the opposite ends of the cylindrical body 6212.
• the speed change unit 6200 further includes first and second outer annular raceways 6221 and 6221a which include convex inner surfaces 6222 and 6222a having arc- shaped cross-sections .
• the first and second outer annular raceways 6221 and 6221a are fastened to the circumferential inner surface of the cylindrical body 6212 using a retaining bar 6212b.
• an elastic member 6323 is supported by one of the bent parts 6212a of the cylindrical body 6212.
• the elastic member 6323 is disposed between the second outer raceway 6221a and the bent part 6212a which is disposed adjacent to a position at which torque changed in speed is output.
• a plurality of rotary members 6226 having high hardness and stiffness is installed between the first and second outer raceways 6221 and 6221a and the first and second inner raceways 6223 and 6223a.
• the diameter of the roller 622 ⁇ e is greater than that of the rotary member body 6226a.
• a speed control unit 6240 is provided around the first inner raceway 6223 of the speed change unit 6200.
• the speed control unit 6240 is provided around the circumferential outer surface of the outer end of the first inner raceway 6223 that protrudes outside of the inner casing 6210.
• the speed control unit 6240 includes a worm wheel
• a coupling hole 6306a is formed in one end of the connection pipe 6306.
• An input shaft 6310 is fitted into the coupling hole 6306a such that a portion of the input shaft 6310 protrudes outside of the housing 6100.
• an output unit 6400 receives external power from the input unit 6300 and outputs torque changed in speed by the gearshift control unit 6200.
• the output unit 6400 includes an output shaft 6410 which is coaxially provided with respect to the support shaft 6314 and coupled to the corresponding cover 6110. A first end of the output shaft 6410 extends outside of the housing 6100, and a second end thereof is disposed inside the housing 6100.
• a flange 6420 is provided on the second end of the output shaft 6410.
• the flange 6420 includes a plurality of power transmission arms 6422 which extends between the first and second outer raceways 6221 and 6221a and the first and outer inner raceways 6223 and 6223a.
• a contact member 6422a is provided on each of the power transmission arms 6422. The contact member 6422a is disposed between the adjacent rotary members 6226 and is in contact with the rollers 6226e of the corresponding rotary members 6226.
• the flange 6420 may be integrally provided on the output shaft 6410. Alternatively, the flange 6420 may be provided separately from the output shaft 6410. In this case, the flange 6420 is coupled to the output shaft 6410 using a coupling means (not shown) . Torque transmitted to the flange 6420 is output to the outside through the output shaft 6410.
• FIG. 19 is a sectional view illustrating a continuously variable transmission, according to an eighth embodiment of the present invention.
• the continuously variable transmission 1Og according to the eighth embodiment of the present invention includes a housing 7100 which has an internal space 7102 therein and is open on the opposite ends thereof. The open ends of the housing 7100 are covered with covers 7110.
• the speed change unit 7200 further includes first and second outer annular raceways 7221 and 7221a which include convex inner surfaces 7222 and 7222a having arc- shaped cross-sections.
• the first and second outer annular raceways 7221 and 7221a are fastened to the circumferential inner surface of the cylindrical body 7212 using a retaining bar 7212b.
• an elastic member 7323 is supported by one of the bent parts 7212a of the cylindrical body 7212.
• the elastic member 7323 is disposed between the second outer raceway 7221a and the bent part 7212a which is disposed adjacent to a position at which torque changed in speed is output.
• a plurality of rotary members 7226 having high hardness and stiffness is installed between the first and second outer raceways 7221 and 7221a and the first and second inner raceways 7223 and 7223a.
• the diameter of the roller 7226e is greater than that of the rotary member body 7226a.
• a speed control unit 7240 is provided around the first inner raceway 7223 of the speed change unit 7200.
• the speed control unit 7240 is provided around the circumferential outer surface of the outer end of the first inner raceway 7223 that protrudes outside of the inner casing 7210.
• the speed control unit 7240 includes a worm wheel 7245a which is provided on the circumferential outer surface of the outer end of the first inner raceway 7223, and a worm gear 7246 which engages with the worm wheel 7245a.
• a worm gear 7246 which engages with the worm wheel 7245a.
• the first inner raceway 7223 is rotated by the rotation of the worm wheel 7245a.
• the worm gear 7246 is provided on a gearshift shaft 7247.
• the opposite ends of the gearshift shaft 7247 are supported by a separate support means (not shown) .
• a motor (not shown) is connected to one of the opposite ends of the gear shift shaft 7247 which are supported by the separate support means.
• an electric motor 7300 which is selectively operated is installed in the housing 7100.
• the electric motor 7300 is fitted over the outer surface of the inner casing 7210 of the speed change unit 7200.
• the electric motor 7300 includes a stator 7302 which is fastened to the circumferential inner surface of the housing 7100, and a rotor 7304 which is provided inside the stator 7302.
• the rotor 7304 has a cylindrical shape which is open on one end thereof, and is fastened, using bolts 7306, to a portion of the inner casing 7210 adjacent to a position at which torque is output.
• the electric motor 7300 is provided with a separate battery (not shown) for operating the rotor 7304.
• a mounting member 7308 is further provided, which has therein a bearing to make the rotation of the rotor 7304 smooth.
• the mounting member 7308 is coupled to the rotor 7304 using the bolts 7306 such that the rotor 7304 can be supported by the mounting member 7308.
• an output unit 7400 receives external power from the electric motor 7300 and outputs torque changed in speed by the gearshift control unit 7200.
• the output unit 7400 includes an output shaft 7410 which is coaxially provided with respect to the support shaft 7314 and coupled to the corresponding cover 7110. A first end of the output shaft 7410 extends outside of the housing 7100, and a second end thereof is disposed inside the housing 7100.
• a flange 7420 is provided on the second end of the output shaft 7410.
• the flange 7420 includes a plurality of power transmission arms 7422 which extends between the first and second outer raceways 7221 and 7221a and the first and outer inner raceways 7223 and 7223a.
• a contact member 7422a is provided on each of the power transmission arms 7422. The contact member 7422a is disposed between the adjacent rotary members 7226 and is in contact with the rollers 722 ⁇ e of the corresponding rotary members 7226.
• the flange 7420 may be integrally provided on the output shaft 7410. Alternatively, the flange 7420 may be separately provided from the output shaft 7410. In this case, the flange 7420 is coupled to the output shaft 7410 using a coupling means (not shown) . Torque transmitted to the flange 7420 is output to the outside through the output shaft 7410.
• the operation of the continuously variable transmission of the eighth embodiment having the above- mentioned construction is the same as that of the prior embodiments, therefore further explanation is deemed unnecessary. Only, unlike the prior embodiments, in the eighth embodiment, in the eighth embodiment, the electric motor 7300 generates power and transmits the power to the speed change unit 7200. Torque is changed in speed by the speed change unit 7200, and the torque changed in speed is output to the outside through the output shaft 7410.
• the continuously variable transmission 1Og can output low torque of low speed or high torque of high speed and thus is suitable for an energy saving motor.
• the speed thereof cannot be optionally changed, so that a separate inverter is required to change the speed of the motor.
• the inverter is an electric device, there are electric problems such as noise, distortion of harmony, etc.
• a frequency of 60hz is converted into another value, with the result that several problems are induced.
• the gearshift can be conducted by the continuously variable transmission 1Og, the conventional problems can be solved. Therefore, the reliability of the product is increased.
• the present invention provides a continuously variable transmission which can function as a clutch to control speed and has an integrated structure, so that it can be used in various fields, for example, in a machining device, a vehicle, etc.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Friction Gearing (AREA)
• Transmissions By Endless Flexible Members (AREA)

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Family Applications (1)

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Citations (4)

Family Cites Families (1)

• 2007
  • 2007-12-20 KR KR1020070134284A patent/KR100863344B1/ko not_active IP Right Cessation
• 2008
  • 2008-12-12 WO PCT/KR2008/007388 patent/WO2009082112A2/en active Application Filing

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